EMER-FLEX COUPLING
CONTENTS INDEX PRODUCT FEATURES PRODUCT STRUCTURE PRODUCT APPLICATIONS PRODUCT SELECTION MODEL LIST NEF-HUB NES Series P. 2 P. 3-4 P. 5-6 P. 7-8 P. 9- P. P. 2 P. 3-4 NEF Series Spacer Type Long Spacer Type Stocked Long Spacer Type Short Spacer Type Single Type Clamping Method Power-Lock Method NEH Series Other Series INSTALLATION BORE SPECIFICATIONS P. 5-6 P. 7-8 P. 9 P. 2 P. 2-22 P. 23-25 P. 26-3 P. 32-33 P. 34-36 P. 37-4 P. 4-45
INDEX PRODUCT SERIES LIST NES Series NEF Spacer Type Rough or keyed bore NEF Long Spacer Type Rough or keyed bore NEF Single Type Rough or keyed bore NES Series products are small disk couplings that use extra super duralumin. Both spacer-type and single-type couplings are available. With Spacer Type, two disk sets absorb angular misalignment, parallel misalignment and axial displacement. Long Spacer Type acts as a floating shaft when the distance between shaft ends is large. With Single Type, a single disk absorbs angular misalignment and axial displacement. NEF Clamping Method Refer to the page noted above when using the clamping method to connect to shafts (friction coupling by tightening one bolt). NEF Power-Lock Method Refer to the page noted above when using the Power-Lock method to connect to shafts. NEH Series NEH Series products are large-size, spacer type couplings. Other Series Tsubaki can manufacture a coupling to suit most any application, such as our G Type products that are compatible with gear couplings. 2
EMER-FLEX COUPLING In order to make the EMER-FLEX COUPLING the ultimate disk coupling, Tsubaki optimized its design using finite element analysis. This coupling will meet all of your needs with no lubrication, no backlash, and with improved torsional stiffness for greater precision. This adds up to excellent flexible coupling performance for reliable torque transmission and absorption of shaft misalignment. Tsubaki offers a full line-up of EMER-FLEX couplings, from the smallsize precision NES Series offering a minimum of.7n m torque transmission to the large size NEH Series delivering up to 76N m torque transmission. Our easy-to-select and convenient wide range of models include the Long Spacer Type, which functions as a floating shaft; the U-Type that enables spacer mounting and dismounting without disassembling the disk connecting section; the G-Type, which can replace gear couplings and other types that use various shaft coupling methods (Power-Lock, keyway, clamp, etc.) These EMER-FLEX couplings are ready to meet all of your next-generation coupling needs. Low moment of inertia (Square hub for Power-Lock) The original TSUBAKI design eliminates unnecessary flange portions. 6 Torsional Stiffness Curve Disk (Supports high torsional stiffness) Torsion Angle (degree) 2 NEF NEF8 NEF25 Strength analysis is used to determine the optimum shape. Torque 3
PRODUCT FEATURES Finish Bored Couplings Single-Type and Spacer-Type couplings with pre-machined, standard diameter shaft bores (new JIS key standard type) are always in stock and available for fast deliveries. Long Service Life With the anti-wear parts, the Emer-flex Couplings have an amazingly long useable life. Floating Shaft Function Long Spacer Type acts as a floating shaft, allowing the transmittance of power from a drive unit at some distance, without the use of bearings. EMER-FLEX Lubrication Free Large Disk Bore Excellent Environmental Durability With no sliding or moving parts, there are no friction faces and lubrication is unnecessary. The disk bore in EMER- FLEX couplings can handle even the largest of shaft diameters. This enables various flexible installations (with shaft mounted in the disk, etc.). Because the Emerflex is an all-metal coupling without lubrication, it can stand up to high temperatures. The unit surface is also specially treated so it can withstand virtually any environment. No Backlash Original TSUBAKI Disk Design Easy Installation Torque is transmitted by friction connections, so there is no backlash and minimum hysteresis. This makes the Emerflex suitable for servo motor and other applications that need high-precision power transmissions. Our original disk design achieves high torsional stiffness and axial flexibility. The Power-Lock Type is equipped with an anti-rotation hole in the pressure flange, so tightening bolts is made easy, with no shaft rotation. With the U-Type couplings (Unit Spacer Type), the spacer can be mounted and dismounted without disassembling the disk connecting section. High Torsional Stiffness Axial Flexibility Quick Delivery With high torsional stiffness, elastic deformation is greatly reduced so even slight rotation movement is precisely transmitted to driven side. When the motor shaft expands due to heat generated during operation, the coupling absorbs the expansion and does not generate unnecessary thrust power against bearing. In addition to our product inventory with standard shaft bore diameters, Tsubaki can offer products with other shaft bore diameters with short delivery times. Low Moment of Inertia Excellent with Servo Motors Standardized Power-Lock Types We have eliminated unnecessary flange portions, and offer a unique square hub, resulting in minimum moment of inertia. With the NES Series, the hub and spacer are made of extra super duralumin, which considerably reduces weight. A new production method makes this coupling strong and lightweight. With the addition of the NES Series, we have couplings that are suitable for small to large servo motor. All Emerflex couplings come standard with a Power-Lock. So each is provided with a pressure plate and pressure bolt. 4
PRODUCT STRUCTURE NEF Series Spacer Type Spacer U-nut Washer A Disk Washer B Washer A Washer B Reamer bolt Hub Single Type Power-Lock Type U-nut Disk Disk Washer B Washer A Reamer bolt Washer A Pressure bolt Washer B U-nut Hub Pressure flange Power-Lock Reamer bolt Hub NES Series NEH Series Overload washer Collar Bush Washer Washer The disk, bush and collar are all integrated. Disk Hexagon socket head bolt Disk set U-nut Overload washer Hub Spacer Reamer bolt Washer Spacer Washer Hub 5
NEF Series Long Spacer Type Spacer EMER-FLEX Washer A Washer B U-nut Washer B Hub U-nut Reamer bolt Washer A Disk NEH Series Long Spacer Type Overload washer Collar Bush U-nut Hub Overload washer The disk, bush and collar are all integrated. Disk set Reamer bolt Spacer 6
PRODUCT APPLICATIONS NC machining centers Lifters Servo motor Emer-Flex Coupling Emer-Flex Coupling Table Ball screw LINIPOWER Jack Emer-Flex Coupling (Power-Lock Type) Windmills Printing presses Generator Emer-Flex Coupling Gear box Gear box Emer-Flex Coupling Speed increaser Robots Elevator-type vertical parking lots Servo motor Roller chain Emer-Flex Coupling Bevel helical reduction gear Emer-Flex Coupling Ball screw Emer-Flex Coupling NES Series 7
Example of Mounting EMER-FLEX Example of Mounting 8
PRODUCT SELECTION. Correct torque calculation -. When connecting to a servo motor or stepping motor To determine the correct torque, multiply the maximum torque of the servo motor or stepping motor by the service factor (SF) corresponding to the type of load listed in the table below. Service Factor (SF) Table Type of Load Service Factor (SF) Constant Load.2 Mid-Level Variable Load -2. When connecting to a general-purpose motor To determine the correct torque, multiply the load torque calculated with the following formula by the service factor (SF) corresponding to the type of load listed in the table on the right. TLoad torque PTransmission power nrotation speed TCorrect torque N m {kgf m} kw r/min N m {kgf m}.4 Heavy Variable Load.5 Service Factor (SF) Table Type of Load General-Purpose Motor / Gas Turbine Low Moment of Inertia High Moment of Inertia Type of Motor 2. Shaft Diameter Make sure that the target shaft diameter does not exceed the allowable mounting shaft diameter for the coupling. With the Power-Lock, check the power lock size, quantity and transmission torque. With the clamp type, make sure that the correct torque determined in Item () does not exceed the allowable transmission torque for the clamp. 3. Maximum Rotation Speed for Long Spacer Types When using the Long Spacer Type coupling at a high speed rotation, the rotation speed must be checked in order to avoid the resonance point. When selecting the Long Spacer Type coupling, make sure that the maximum dimension J and the rotation speed for each model are not exceeded. If the operating rotation speed exceeds the specified value, a larger model number must be selected. If the operating rotation speed is not within the following range, or if the selection of a larger model number is not an option, a High-Speed Type Long Spacer coupling can be manufactured as one solution. (See p. 36) Engine 4-Cylinder 6-Cylinder 8-Cylinder Constant Load.5.75.752. 2.54. 2.2.5.52. Mid-Level Variable Load 2.2.5 2.53. 4.5. 2.53.5 2.3. Heavy Variable Load 3.4.5 4.56. 4.55.5 3.4. 2.53.5 * If an impact load is expected, determine the correct torque by multiplying the maximum torque rated for the motor by an impact factor of to 2.5. * When clamp or power lock method is used, do not allow torque that is larger than the shaft bore friction transmission torque (see p. 25 and p. 3), including the starting torque, even for an instant. Operating Rotation Speed r/min 36 Long Spacer Maximum Length (Dimension J ) Unit: mm 2 8 5 2 9 75 72 6 5 4 3 2 5 NEF 4W NEF W NEF 8W NEF 25W NEF 45W NEF 8W NEF3W NEF2W NEF34W NEF54W NEF7W NEH 9W NEH 4W NEH 2W NEH 3W NEH 4W 98 3 38 5 68 84 94 23 27 238 26 29 336 42 475 2 5 58 73 94 22 223 245 25 273 299 335 386 473 546 8 58 66 82 24 223 235 257 262 287 35 352 46 497 574 3 76 85 23 226 248 26 286 292 39 35 39 45 552 44 93 23 223 249 272 287 34 32 35 384 429 496 56 29 22 24 269 295 3 34 347 38 46 465 536 78 238 25 275 37 336 354 387 395 433 474 529 89 252 266 29 325 356 375 4 49 458 52 56 224 272 287 33 35 383 44 442 45 493 54 28 29 37 336 375 4 432 473 482 528 578 227 33 39 349 389 426 449 49 5 549 29 293 39 338 378 43 436 477 487 533 583 29 293 39 338 378 43 436 477 487 533 583 24 32 338 369 43 452 476 52 532 582 257 343 36 396 442 484 5 558 569 265 354 373 48 456 499 526 576 587 9
4. Precautions for Connecting a Servo Motor Drive System Depending on the natural frequency and electric control status of the system as a whole, a ball screw drive system using a servo motor may generate large vibration or abnormal sound caused by oscillation due to the characteristics of the servo motor. In this case, adjust the torsional stiffness and moment of inertia of the overall drive system to increase the torsional natural frequency, or adjust the servo gain with the electric control tuning function of the servo motor. 5. Select the EMER-FLEX Coupling that Meets the above Requirements, through 4, from the Transmission Capacity Table. EMER-FLEX Dynamic Balance Adjustment Normally, because EMER-FLEX couplings provide a well-balanced design, they need no particular balance adjustment. However, when the coupling is used at a high rotation speed, or when a long spacer is used, balance adjustment may be required. In this case, inform us of your desired operating rotation speed, JIS balance rating, dimension J, or spacer length so that we can perform your balance adjustment. For dynamic balance adjustment, we use the following two methods: ) Drilling the spacer flange end face, and 2) Mounting a balance weight to the spacer pipe periphery. (The spacer with a balance weight is shown below. The balance weight mounting position and quantity vary depending on operating conditions. Be careful not to interfere with the balance weight during rotation.) When requesting a balance adjustment, specify either method ) or 2) above. Balance weight A Spacer Mounted with a Balance weight Notes for Large Distance between Shaft Ends For large distance between shaft ends, Tsubaki offers a Long Spacer Type that can be used in a floating state without the need for an intermediate shaft bearing. We recommend this type of coupling if it fits your application needs. If an intermediate shaft bearing is being used instead of the Long Spacer Type coupling for reasons of convenience, fasten the intermediate shaft with a bearing to prevent the intermediate shaft from floating. In this case, it is recommended that the Spacer-Type disk coupling be used. Long Spacer Type Spacer Type + Fixed intermediate shaft + Spacer Type If the distance between shafts is short and an intermediate shaft is used in a floating condition, be sure to use the Single-Type coupling. Never use the Spacer-Type coupling under such conditions; it is very dangerous due to the marked floating tendency of the intermediate shaft. Single Type + Floating intermediate shaft + Single Type Spacer Type + Floating intermediate shaft + Spacer Type Pay special attention to the above when replacing gear couplings or roller chain couplings with disk couplings.
MODEL LIST NES7 NES5 NES2 NES3 NES5 NES7 NES NES25 NES8 NES3 NEF2 NEF4 NEF NEF8 NEF25 NEF45 NEF8 NEF3 NEF2 NEF34 NEF54 NEF7 NEH9 NEH4 NEH2 NEH3 NEH4 NEH55 Type Allowable Torque Nm {kfm}.7 {.7 }.5 {.5 } 2 {.2 } 3 {.3} 5 {.5} 7 {.7} { } 25 { 2.6 } 8 { 8.2 } 3 { 3 } 9.6 { 2 } 39.2 { 4 } 98 { } 76 { 8 } 245 { 25 } 44 { 45 } 784 { 8 } 27 { 3 } 26 { 2 } 333 { 34 } 529 { 54 } 686 { 7 } 882 { 9 } { 37 4 } { 96 2 } { 294 3 } { 42 4 } { 539 55 } Keyway Max. Bore Diameter Standard Extended- Hub Dia. Hub Rough Bore (Spacer Type) Rough Bore (Single Type) Standard Length (Long Spacer Type) Long Spacer Type Type of Hub Extended- Dia. Hub 2 25 23 28 32 4 35 42 42 48 5 6 6 7 74 8 83 9 95 9 2 8 3 (58) 33 52 65 87 (58) (82) (26) (224) Standard Hub Long Hub Square Hub Keyway Bore Machining G-Type A-Hub Power- U-Type Tapered Bore Type Clamp Lock,6 NEH7 686 { 7 } 25 NEH9 882 { 9 } 23 NEH 78 { } 254 NEH35 323 { 35 } 263 NEH5 47 { 5 } 275 NEH8 764 { 8 } 289 Values in parentheses for the NEH9 to NEH4 apply to the A-hub and U-types. Standard Custom-made
DIMENSIONS NEF Series Hub Dimensions Extended-Diameter Hubs If the target shaft diameter exceeds the maximum shaft bore diameter of the standard hub regardless of there being sufficient leeway in the transmission capacity, you may select the extended-diameter hub that provides a larger boss diameter (dimension H ). This way you can avoid increasing the model size. Long Hubs If the key surface pressure is too high with the standard hub, you may select the long hub that provides a longer dimension B, which lowers the key surface pressure. Square Hubs The square hub is used as a combination with the EL Series Power-Lock Type coupling and the pressure flange set. The pressure bolt tap has been machined into the hub. EMER-FLEX Standard Hub / Long Hub Extended-Dia. Hub Square Hub Max. bore dia. Max. bore dia. Max. bore dia. H DIMENSIONS Unit: mm B H Max. Bore Dia. Rough Bore K Standard Hub Standard Hub Extended- Standard Hub / Long Hub Extended-Dia. Hub Square Hub Extended- Long Hub Square Hub Long Hub Dia. Hub Square Hub d Dia. Hub Keyway Power-Lock Keyway Power-Lock Power-Lock NEF2 NEF4 NEF NEF8 NEF25 NEF45 NEF8 NEF3 NEF2 NEF34 NEF54 NEF7 57 67.5 8 93 4 26 43 68 94 24 246 276 2 25.4 25.4 28.7 33.5 4. 47.8 57.2 63.5 76.2 88.9.6 4 4 45 5 6 7 85 2 4 4 5 * Note: Only the standard hub can be used with the NEF2. 25.4 28.7 33.5 32 34 46 5 6 7 84 6 8 37 56 69 * Note 45 5 66 66 78 92 4 29 47 66 9 29 47 49 6 8 8 2 5 5 5 25 25 45 5 5 2 23 32 35 42 5 6 74 83 95 9 8 35 45 65 7 85 25 28 4 42 48 6 7 8 9 2 3 2 22 3 35 42 5 6 75 85 2 35 35 42 Hub for Taper Shaft Bore For a 6 taper shaft bore, the following four types of hubs are available in stock: NEF4 Hub-6T NEF4 Hub-L6T NEF Hub-6T NEF Hub-L6T Dimension ÒAÓ Dimension ÒAÓ Dimension ÒDÓ Dimension ÒDÓ Taper Servo motor shaft Servo motor shaft Servo motor shaft Servo motor shaft 2
TRANSMISSION CAPACITY / DIMENSIONS Small-Size, Precision: NES Series High torsional stiffness The high torsional stiffness enables the couplings to provide excellent trackability for servo motors, making the NES Series perfect for precision control applications. Compact & low moment of inertia NES Series couplings employ extra super duralumin in the hub and the spacer, resulting in a compact body. With the reduced outer diameter, this type also lowers the moment of inertia. RoHS compliant The NES Series offers environmentally conscious designs that comply with the RoHS Directive. Shipment of fully assembled parts NES Series couplings are shipped as a complete assembly (with finished bores), so the coupling can be directly mounted to your equipment. NES Spacer Type Couplings X Reference Number System (Example) K D D NES3W - NC X N2C O Y B E J A E B Series Size Spacer Type Bore Diameter (mm) Clamp Type of Hub N: Standard Hub * Indicate the smaller bore diameter first. NES7W NES5W NES2W NES3W NES5W NES7W NESW NES25W NES8W NES3W Allowable Torque Nm {kfm} Cross-section X-O-Y (Note 5) (Note ) (Notes 4, 6) Torsional Stiffness Axial (Note 3) (Note 2) (Note 2) (Note 2) Clamp Bore Dia. Dimensions Nm/rad Moment mm Allowable Misalignment D mm {kfm/rad} Weight of Inertia GD 2.7 {.7}.5 {.5} 2. {.2} 3. {.3} 5. {.5} 7. {.7} {.} 25 {2.6} 8 {8.2} 3 {3} Max. Rotation speed Bore Dia. r/min Range 8 8 8 8 8 8 5 4-6 4-8 5-6-6 6-6 8-2 8-22 -25 4-3 2-35 Standard Bore Dia. Refer to the ÒStandard bore diameter and the transmission torque for each bore diameteró table (on the next page). A B E K J 8.9 26 3.7 35.6 4 45.5 48. 59 7.9 97.9 7.5 8.9.8 2.5 5 5.7 2 23.5 3.5.85...5.5.75 2.6 3 4.7 5.2 6 9 24 3 34 37 44 55 64 82 2 5 3.9 8.2 9.7 5.5 6.7 9 23.9 34.9 Whole Coupling Disk Only 2 6 {2} {6} 42 3 {43} {3} 28 {} {29} 6 42 {6} {43} 2 65 {2} {66} 46 95 {47} {97} 62 5 {63} {5} 22 {} {22} 23 39 {23} {4} 46 {47} {} Spring Constant N/mm {kf/mm} 87 {8.9} 47 {4.8} 43 {4.4} 24 {2.4} 25 {2.6} 29 {3.} 33 {3.4} {.} 27 {2.8} 33 {3.4} Angular Misalignment deg.4 2. 2. 2. 2. 2. 2. 2. 2. 2. Parallel Misalignment mm.5.2.5.8.24.24.25.28.34.52 Axial Displacement mm.24.36.6.8.8.9..4.4.8 g 9 7 32 53 76 97 6 32 5 2 km 2.32-6.9-6 2.7-6 8. -6 4-6 2-6 47-6 4-6 32-6 -6 Notes. The maximum rotation speed does not take dynamic balance into consideration. 2. The weight, moment of inertia and GD 2 are the values at maximum bore diameter. 3. The allowable misalignment is based on the assumption that other errors are ÒÓ. 4. Bore diameters other than the standard diameters specified on p. 4 can be manufactured upon request. 5. Depending on the bore diameter, the allowable torque of the coupling may not be satisfied. Refer to the ÒStandard Bore Diameter and Transmission Torque for Each Bore DiameterÓ table (on the next page). 6. The recommended tolerance of the mounting shaft is rated at Òh7Ó. A shaft diameter of 35 corresponds to a servo motor shaft with a tolerance of (+. to ). {kfcm 2 } {.} {.4} {.} {.32} {.54} {.84} {.9} {5.7} {3} {45} 3
NES Single Type Couplings K D D O X Y Reference Number System (Example) NES3S - NC X N2C EMER-FLEX E B B A Cross-section X-O-Y Series Size Single Type Bore Diameter (mm) Indicated as Ò6.3Ó for a 6.35 bore diameter and Ò9.5Ó for a 9.525 bore diameter. Type of Hub N: Standard Hub * Indicate the smaller bore diameter first. Clamp NES7S NES5S NES2S NES3S NES5S NES7S NESS NES25S NES8S NES3S (Note 5) (Note ) (Notes 4, 6) Torsional Stiffness Axial (Note 3) (Note 2) (Note 2) (Note 2) Clamp Bore Dia. Dimensions Nm/rad Moment mm Allowable Misalignment D mm {kfm/rad} Weight of Inertia GD 2 Allowable Max. Torque Rotation Nm Speed {kfm} r/min.7 {.7}.5 {.5} 2. {.2} 3. {.3} 5. {.5} 7. {.7} {.} 25 {2.6} 8 {8.2} 3 {3} 8 8 8 8 8 8 5 Bore Dia. Range 4-6 4-8 5-6-6 6-6 8-2 8-22 -25 4-3 2-35 Standard Bore Dia. Refer to the ÒStandard bore diameter and the transmission torque for each bore diameteró table below. 5.85 8.9 23. 25. 26.5 3.75 34 43 A B E K 5.7 68.2 7.5 8.9.8 2.5 5 5.7 2 23.5 3.5.85...5.5.75 2.6 3 4.7 5.2 6 9 24 3 34 37 44 55 64 82 Whole coupling Disk only 43 2 {44} {2} 78 26 {8} {27} 8 56 {8} {57} 37 84 {38} {86} 45 3 {46} {3} 74 9 {76} {9} 3 {} {3} 9 44 {9} {45} 39 78 {4} {8} 77 22 {79} {22} Spring Constant N/mm {kf/mm} 7 {7} 93 {9.5} 86 {8.8} 48 {4.9} 5 {5.2} 58 {5.9} 65 {6.6} 2 {2.} 52 {5.3} 65 {6.6} Angular Misalignment deg.7......... Parallel Misalignment mm.2.2.2.8.2.3.2.4.2.4.2.45.2.55.2.7.2.7.2.9 7 2 23 37 49 66 22 35 79.26-6.63-6.9-6 5.5-6 8.8-6 4-6 32-6 -6 22-6 77-6 Notes. The maximum rotation speed does not take dynamic balance into consideration. 2. The weight, moment of inertia and GD 2 are the values at maximum bore diameter. 3. The allowable misalignment is based on the assumption that other errors are ÒÓ. 4. Bore diameters other than the standard diameters specified below can be manufactured upon request. 5. Depending on the bore diameter, the allowable torque of the coupling may be limited. Refer to the ÒStandard Bore Diameter and Transmission Torque for Each Bore DiameterÓ table below. 6. The recommended tolerance of the mounting shaft is rated at Òh7Ó. A shaft diameter of 35 corresponds to a servo motor shaft with a tolerance of (+. to ). Axial Displacement mm g km 2 {kfcm 2 } {.} {.3} {.8} {.22} {.35} {.57} {.3} {4.} {8.7} {3} Standard Bore Diameter and Transmission Torque for Each Bore Diameter Bore Diameter (mm) NES7 NES5 NES2 NES3 NES5 NES7 NES NES25 NES8 NES3 4.7.3 5.7.5 2 6.7.5 2 3 5 6.35.5 2 3 5 7.5 2 3 5 8.5 2 3 5 7 9 2 3 5 7 9.525 2 3 5 7 2 3 5 7 25 3 5 7 25 2 3 5 7 25 4 3 5 7 25 8 5 3 5 7 25 8 6 3 5 7 25 8 7 7 25 8 8 7 25 8 9 7 25 8 2 7 25 8 7 22 25 8 8 24 25 8 3 25 25 8 3 28 8 3 3 8 3 Unit: N m 32 35 3 3 4
TRANSMISSION CAPACITY / DIMENSIONS NEF Series: Spacer Type Couplings The NEF Series Spacer Type coupling incorporates two sets of disk kits, enabling absorption of all misalignments. This type of coupling provides the widest application range. NEF2W - N X N Note: The spacer shape is different from that of other sizes. The standard hub and extendeddiameter hub are in stock. Contact us for long hubs. Standard HubStandard Hub NEFW -N XN Extended-Dia. HubStandard Hub NEFW -K XN Standard hub Reamer bolt Washer A Washer B Disk U-nut Spacer Set screw Standard hub Extended-dia. hub Reamer bolt Washer A Washer B Disk U-nut Spacer Set screw Long HubStandard Hub NEFW -L XN Extended-Dia. HubExtended-Dia. Hub NEFW -K XK Long hub Standard hub Reamer bolt Washer A Washer B Disk U-nut Spacer Set screw Extended-dia. hub Reamer bolt Washer A Washer B Disk U-nut Spacer Set screw Extended-Dia. HubLong Hub NEFW -K XL Long HubLong Hub NEFW -L XL Extended-dia. hub Long hub Reamer bolt Washer A Washer B Disk U-nut Spacer Set screw Long hub Reamer bolt Washer A Washer B Disk U-nut Spacer Set screw 5
Spacer Type Allowable Torque Nm{kfm} Max. Rotation Speed r/min Rough Bore d Keyway Standard Stock Bore Dia. Range Keyway Max. Shaft Dia. Standard Hub Long Hub Extended- Dia. Hub Torsional Stiffness Nm/rad{kfm/rad} Axial Spring Constant N/mm{kf/mm} Unit: mm A A2 A3 NEF2W 9.6{ 2} 2 8 4-25 2 25. 4 {. 4 } 34.3{ 3.5} 44 63 NEF4W 39.2{ 4} 2 8-22 23 23 29.8 4 {.2 4 } 2.6{ 2.} 49.5 86.8.4 6 NEFW 98 { } 2 2-3 32 32 4 3.92 4 {.4 4 } 29.4{ 3 } 63 89.8 4.4 9 NEF8W 76 { 8} 8 2 4-35 35 35 42 7.84 4 {.8 4 } 63.7{ 6.5} 7 4.4 2.7 37 NEF25W 245 { 25} 5 5 8-42 42 42 48 2.7 4 {.3 4 } 78.4{ 8 } 82 2 36.5 53 NEF45W 44 { 45} 3 5 25-5 5 5 6 2.6 4 { 2.2 4 } 9 {.} 96 44.2 63. 82 NEF8W 784 { 8} 2 5 3-6 6 6 7 39.2 4 { 4. 4 } 53 {5.6} 64.6 86.8 29 NEF3W 27 {3} 25 35-7 74 74 8 73.5 4 { 7.5 4 } 77 {8.} 34 92.4 22.2 248 NEF2W 26 {2} 8 25 83 83 9.3 5 {.5 4 } 225 {23 } 53 26 272.5 329 NEF34W 333 {34} 75 45 95 95 6.2 5 {6.5 4 } 235 {24 } 72 249.4 33.2 377 NEF54W 529 {54} 34 5 9 9 2 2.4 5 {2.8 4 } 274 {28 } 98 286.8 337.9 389 NEF7W 686 {7} 3 7 8 8 3 29. 5 {29.7 4 } 294 {3 } 28 337.2 385.6 434 PCD EMER-FLEX B BL E F H HL J K DD N No Ni T T' Notes Allowable Misalignment Angular Parallel Misalignment Misalignment de mm. See p. 2 for extended diameter and long hub dimensions. With the long hub, the overall length is extended because dimension B is lengthened. 2. All stocked models are manufactured with pilot bores. Models NEF4W through NEF3W have been stocked with shaft bores machined within the above standard stock bore diameter range. (New JIS key, normal type) 3. The maximum rotation speed depends on the transmission capacity of the coupling. No balance adjustment has been conducted. 4. The weight, moment of inertia and GD 2 are the values at maximum bore diameter (keyway). For the extended-diameter hub and the long hub, add the individual values listed below. 5. Spacer lengths other than the standard length can be manufactured. For details on the Long Spacer Type, see p. 7. 6. The allowable axial displacement is based on the assumption that the angular misalignment is. 7. Check the key surface pressure in accordance with your operating conditions (see p. 8). The hub material is S45C. Axial Displacement (Note) Weight k Moment of Inertia k m 2 GD2 {kf cm 2 } NEF2W 2 4.9 5.5 32 45 23 57 2 24 24 2.3.6.45.66-4 { 6.64 } NEF4W 25.4 4 6. 7.5 34 5 36 67.5 29 25 33 25 5.5.9 2.5.6. 5.3-4 { 2.4 } NEFW 25.4 4 6.6 7.5 46 66 39 8 37 37 46 37 6.4 2.55 2..4 2-4 { 47 } NEF8W 28.7 45 8.3 9 5 66 47 93 39 38 48 38 23 6.7 2.6 2.4 2.3 25-4 { } NEF25W 33.5 5.2 9 6 78 53 4 45 47 58 47 2 4.5 2.7 2.8 3. 4-4 { 66 } NEF45W 4. 6.7.5 7 92 62 26 5 58 69 58 23 4. 2.8 3.2 6.6-4 { 44 } NEF8W 47.8 7.7 4 84 4 69 43 6 7 8 7 29.5 7.3 2.9 3.6.3 2-4 { 8 } NEF3W 57.2 85 6.8 4 6 29 78 68 73 92 2 92 2-7.8 2. 5. 6. 447-4 { 787 } NEF2W 63.5 2 7. 6.5 8 47 89 94 84 3 4 3 32.5-24 2.2 5.4 23.2 93-4 { 3722 } NEF34W 76.2 4 2.6 6.5 37 66 97 24 97 8 32 8 9.5-44.3 2.3 6.6 4.2 478-4 { 592 } NEF54W 88.9 4 23.9 9 56 9 9 246 35 5 35 24.5-5.6 2.4 7.6 55 34-4 {255 } NEF7W.6 5 27.2 25.5 69 29 34 276 2 46 64 46 4-8.4 2.8 8. 6 5972-4 {23889 } Reference Number System (Example) NEF8W - N3J X K4E Type S: Single Type W: Spacer Type Bore Diameter (Rough bore: R) Type of Hub N: Standard Hub K: Extended-dia. Hub L: Long Hub B: Square Hub * See p. 2. *: Indicate the smaller bore diameter first. *2: Indicate the rough bore (symbol R ) first. Shaft Coupling Method J: Keyway of new JIS normal type E: Keyway of old JIS Type 2 C: Clamp (See p. 23) P2: Power-Lock (See p. 26) * The number indicates the number of power locks. T: Taper Shaft Bore (See p. 45) 6 Increase in Weight, Moment of Inertia and GD 2 per Extended-Diameter Hub / Long Hub Extended-Dia. Hub Long Hub Weight Moment of GD k 2 Inertia km 2 {k fcm 2 } Weight k Moment of GD 2 Inertia km 2 {k fcm 2 } NEF2W.27.8-4 {.74} NEF4W.46.34-4 {.35}.56.2-4 {.47} NEFW.5.3-4 { 5.8}.2.77-4 { 3.8} NEF8W.42. -4 { 4.9}.4.67-4 { 2.69} NEF25W.3 3. -4 {.3 }.2.3-4 { 5.4} NEF 45W.4 5.8-4 { 23.2 }.3 2.8-4 {.2 } NEF8W.6-4 { 42.6 }.47 6.4-4 { 25.6 } NEF3W.67 36-4 { 44 }.99 2-4 { 82. } NEF2W.9 73-4 { 289 } 2.45 64-4 { 254 } NEF34W.9 8-4 { 473 } 3.85 32-4 { 533 } NEF54W 2.3 273-4 {89 } 3.9 78-4 { 7 } NEF7W 2.9 43-4 {724 } 4.4 236-4 { 929 }
TRANSMISSION CAPACITY / DIMENSIONS Long Spacer Type The NEF Series Long Spacer Type of coupling enables the use of a floating shaft when there is some distance between devices. Depending on the spacer length, the Long Spacer Type of coupling can also absorb a large amount of eccentricity. This coupling is suitable for line shaft drives to miter gearboxes. N N2 N3 Torsional Stiffness Calculation for Vertical Long Spacer Type If dimension J for each coupling size exceeds the value listed in the following table when a Long Spacer Type is installed vertically, a thrust supporter is required as shown on the right. Unit: mm Dimension J Dimension J Dimension J NEF4W 39 NEF3W 9 NEFW 48 NEF2W 924 NEF8W 7 NEF34W 243 NEF25W 429 NEF54W 542 NEF45W 386 NEF7W 463 NEF8W 55 NEH9W 53 NEH4W 767 NEH2W 277 NEH3W 747 NEH4W 355 Vertical Long Spacer Type Thrust supporter Formula for Torsional Stiffness Calculation of Vertical Long Spacer Type Use the following formula to calculate the torsional stiffness of vertical Long Spacer Type coupling. T 4 JJKK2 Nm/rad Unit: {kfm/rad} J K K2 NEF4W 63.489 32. NEFW 64.472 22.2 NEF8W 74.67 22.5 NEF25W 89.4.475 9.2 NEF45W 5.6.435 2. NEF8W 9.5 2. NEF3W 48.32 7.3 NEF2W 6.333 8.3 NEF34W 95.6.37 2.6 NEF54W 225.6.276 49.5 NEF7W 257.6.286 47. NEH9W 258.36 7. NEH4W 292.56 6.3 NEH2W 33.374 5.4 NEH3W 373.374 4.3 NEH4W 39.354 5.8 J: The dimension J given in the external drawing (distance between hub end faces) in mm. T: The allowable torque given in the transmission capacity table in Nm{kfm} Substitute the constants given in the above table for J, K and K2. Approx. Weight of Long Spacer Type Coupling / Moment of Inertia and GD 2 Calculation Formulae Weight Moment of Inertia, GD 2 W W2 J G d G2 d2 NEF4W.4.3 6.3 6 8.7 4 2.7 NEFW.5 2. 6.4 48 6.3 2 4.63 NEF8W.6 3. 7.4 8.9 25 4.72 NEF25W.8 4.4 8.9 7 26.4 43 6.59 NEF45W. 8..6 446 4.3 2.33 NEF8W. 3.6.9 872 55. 28 3.78 NEF3W.8 22.7 4.8 237 88.3 534 22.6 NEF2W.2 3.6 6. 466 3.6 7 28.4 NEF34W.25 52.7 9.6 6722 6.7 68 4.42 NEF54W.36 68.8 22.6 4363 28.4 359 52.9 NEF7W.38 78.4 25.8 26687 24.9 6672 6.47 NEH9W.44 64.8 25.8 2286 27.5 5522 54.38 NEH4W.44 72.4 29.2 247 27.5 627 54.38 NEH2W.65 9 33 47625 3. 96 77.74 NEH3W.75 5 37.3 8277 47.5 NEH4W.95 2 39 25437 46.2 3359 5.3 Use the following formula to calculate the weight of the Long Spacer Type (at maximum bore diameter). Unit: k WeightWJJW2 J: Dimension J (distance between hub end faces) in mm. Substitute the constants given in the above table for J, W, W2, d, d2, G and G2. * This formula applies to cases where dimension J exceeds J (Unit: cm). Use the following formulae to calculate the moment of inertia and GD 2 (at maximum bore diameter). GD 2 WdJJG Unit: kfcm 2 Moment of inertiawd2jjg2 Unit: kcm 2 2693.87 7
Unit: mm Type (Number of Bolts) Allowable Torque Nm{kfm} Rough Bore d Max. Bore Dia. (Keyway) B DD E H K N N2 N3 A J NEF 4W 4 39.2{ 4} 8 23 25.4 29 6. 34 67.5 7 27 32 Allowable Misalignment Angular Parallel Axial Misalignment Misalignment Displacement de 2.6 NEF W 4 98 { } 32 25.4 37 6.6 46 8 26 36 42 2 2. EMER-FLEX NEF 8W 4 76 { 8} 2 35 28.7 39 8.3 5 93 3 4 46 2 2.4 NEF 25W 4 245 { 25} 5 42 33.5 45.2 6 4 38 5 56 2 2.8 NEF 45W 4 44 { 45} 5 5 4. 5.7 7 26 48 6 68 2 3.2 NEF 8W 4 784 { 8} 5 6 47.8 6.7 84 43 6 7 8 2 3.6 NEF3W 4 27 { 3} 25 74 57.2 73 6.8 6 68 76 92 2 2 5. NEF2W 4 26 { 2} 25 83 63.5 84 7 8 94 9 3 5 2 5.4 NEF34W 4 333 { 34} 45 95 76.2 97 2.6 37 24 2 32 2 6.6 NEF54W 4 529 { 54} 5 9 88.9 23.9 56 246 25 34 54 2 7.6 NEF7W 4 686 { 7} 7 8.6 2 27.2 69 276 36 45.2 65.2 2 8. NEH 9W 6 882 { 9} 7 44 9 6 276 27 35 59 2BJ.4 3.2 NEH 4W 8 37 { 4} 7 27 55 9 6 276 27 35 59 2. NEH 2W 8 96 { 2} 75 33 46 78 9 93 38 5 6.7 9.7 2.4 Required length (Max 6) (JE)sin NEH 3W 8 294 { 3} 75 52 65 2 2.5 28 346 75 86.3 26.3 2.8 NEH 4W 8 42 { 4} 2 65 7 28 24 24 375 87 96 232 2.8 NEH 55W 8 539 { 55} 3 87 225 252 29.5 272 445 27 227.4 267.4 3.6 NEH 7W 8 686 { 7} 5 25 247 275 3.3 297 47 29 23 28 3.8 NEH 9W 8 882 { 9} 5 23 278 34 32. 334 5 247 273.9 323.9 4.3 NEHW 8 78 {} 9 254 35 343 32.5 364 556 277 35.6 355.6 4.8 NEH35W 8 323 {35} 9 263 37 35 34. 382 587 34 33 38 5. NEH5W 8 47 {5} 2 275 33 368 34.5 399 629 34 33 38 5.6 NEH8W 8 764 {8} 2 289 347 38 35.5 49 654 39 344.6 46.4 5.7 Notes. All sizes are custom-made. 2. When placing an order, specify dimension J. Consult with us if your required dimension is 6 mm or greater. 3. When the Long Spacer Type is used at a high rotation speed, or if dimension J is extremely long, balance adjustment or a critical speed check may be required. See p. 9. 4. Contact us to vertically install a Long Spacer Type coupling. 5. The NEFW, 8W and 25W Power-Lock Type couplings use the square hub for power lock. (See p. 2) 6. Refer to the following description and check the key surface pressure in accordance with your operating conditions. The hub material is S45C. Required length (Max 4) Installation (Example) Roller table Roller Roller Pillow block EMER-FLEX coupling Miter gearbox EMER-FLEX coupling Miter gearbox Reference Number System (Example) NEF25W - N35JV X N4E - J Spacer Type Type of Hub N: Standard Hub K: Extended-Dia. Hub L: Long Hub B: Square Hub * See p. 2. Indicates the lower-side bore diameter of the vertical Long Spacer Type coupling. Bore Diameter (Rough bore: R) *: Indicate the smaller bore diameter first. *2: Indicate the rough bore (symbol R ) first. Dimension ÒJÓ J: Long Spacer JS: Long Spacer (standard length) (See p. 9) JT: Single Plate Spacer (See p. 2) Shaft Coupling Method J: Keyway of new JIS normal type E: Keyway of old JIS Type 2 C: Clamp (See p. 23) P2: Power-Lock (See p. 26) T: Taper Shaft Bore (See p. 45) *[Reference] Key Surface Pressure Calculation P 96T N/mm 2 DtB (T = Operating torque (N m), D = Bore diameter (mm), t = Key height (mm), B = Effective key length (mm)) D B t 8
TRANSMISSION CAPACITY / DIMENSIONS Long Spacer Type (standard lengths) We maintain a stock of NEF Series Long Spacer Type couplings at ISO standard lengths available for a quick delivery. The spacer offers a wellbalanced design with reduced thickness, suitable for back pullout type pumps, fans and compressors. This type of coupling can also be combined with the extended-diameter hub, long hub, and clamp types. Long Spacer Type (standard length) Long Spacer Types in Stock F Spacer Length, Dimension J (mm) 27 4 8 2 25 N No NEFW- JS NEF8W- JS Do PCD NEF25W- JS Reference Number System (Example) NEF25W - N35J X N4E - JS4 NEF45W- JS NEF8W- JS Spacer Type Type of Hub N: Standard Hub K: Extended-Dia. Hub L: Long Hub B: Square Hub * See p. 2. Bore Diameter (Rough bore: R) *: Indicate the smaller bore diameter first. *2: Indicate the rough bore (symbol R ) first. Dimension ÒJÓ JS: Long Spacer Type (standard length) Shaft coupling method J: Keyway of new JIS normal type E: Keyway of old JIS Type 2 C: Clamp (See p. 23) P2: Power-Lock (See p. 26) T: Taper Shaft Bore (See p. 45) NEF3W- JS NEF2W- JS NEF34W- JS Note) Refer to the dimension table for dimension J. Dimension J indicates the distance between hub end faces. Actual spacer length = J 2E Unit: mm Allowable Rough Max. Torque Bore Bore Dia. B DD E H K A F N No T PCD Weight Moment Allowable Misalignment GD of Inertia 2 Angular Axial Parallel N m{k f m} d (Keyway) k {kf cm k cm 2 } Misalignment Misalignment 2 Displacement (de) JS 5.8.7 2.8 { 5} 2.63 NEF W 98{ } 32 25.4 37 6.6 46 8 7.5 37 46 6 63 ±2. JS4 9.8.9 3.5 { 54} 2 2.32 NEF 8W JS 57.4 2.6 25.8 { 3} 2.6 76{ 8} 2 35 28.7 39 8.3 5 93 9 38 48 23 7 ±2.4 JS4 97.4 2.8 26.8 { 7} 2 2.3 JS 67 3.3 42.3 { 69} 2.55 NEF 25W JS27 245{ 25} 5 42 33.5 45.2 6 4 94 9 47 58 2 82 3.5 43.8 { 75} 2 ±2.8 2.2 NEF 45W NEF 8W NEF3W NEF2W JS4 27 3.6 44.3 { 77} 2 2.25 JS 82.2 6.9 97.5 { 39} 2.54 JS27 29.2 7.2 { 4} 2 2. JS4 222.2 7.3 { 44} 2 2.24 44{ 45} 5 5 4. 5.7 7 26.5 58 69 23 96 ±3.2 JS8 262.2 7.6 4.5 { 48} 2 2.94 JS2 282.2 7.8 6.3 { 425} 2 3.28 JS25 332.2 8.2.8 { 443} 2 4.6 JS27 222.6.8 2.8 { 87} 2 2. JS4 235.6 23.5 { 84} 2 2.24 JS8 784{ 8} 5 6 47.8 6.7 84 43 275.6 4 7 8 29.5.3 28.8 { 835} 2 ±3.6 2.94 JS2 295.6.5 2.5 { 846} 2 3.28 JS25 345.6 2 28.3 { 873} 2 4.6 JS27 24.4 6.7 42.8 {683} 2.92 JS4 254.4 6.8 424.5 {698} 2 2.5 JS8 27{3} 25 74 57.2 73 6.8 6 68 294.4 4 92 2 2 34 7.3 435.8 {743} 2 ±5. 2.85 JS2 34.4 7.6 44.5 {766} 2 3.2 JS25 364.4 8.2 455.5 {822} 2 4.7 JS4 267 24 85.5 {346} 2 2.5 JS8 26{2} 25 83 63.5 84 7 8 94 37 6.5 3 4 32.5 53 24.5 868.8 {3475} 2 ±5.4 2.84 JS2 327 24.8 877.5 {35} 2 3.9 JS8 332.4 42 427.3 {579} 2 2.76 NEF34W 333{34} 45 95 76.2 97 2.6 37 24 6.5 8 32 9.5 72 ±6.6 JS2 352.4 42.4 444 {5776} 2 3. 9
Using the Long Spacer Type Couplings in Stock The following methods are available if the Long Spacer Type couplings in stock do not fit your equipment interface. When the required Long Spacer is slightly longer than the product in stock... h Use the long hub on both sides. When the required long spacer is slightly shorter than the product in stock... h Extend both shafts from the hubs. The disk s bore diameter can be made to fit the maximum shaft diameter of either the standard or the long hub. EMER-FLEX Single Plate Spacer Type The NEF Series Single Plate Spacer Type reduces the distance between hub end faces (dimension J ) and is suitable for applications where the distance between shaft ends is short, or where the overall length must be shortened. PCD H d K B E J A E B T Unit: mm NEF4W NEFW NEF8W NEF25W NEF45W NEF8W NEF3W NEF2W NEF34W NEF54W NEF7W Allowable Torque N m{kgf m} Rough bore d Max. Bore Dia. (Keyway) 39.2 { 4} 8 23 98 { } 32 76 { 8} 2 35 245 { 25} 5 42 44 { 45} 5 5 784 { 8} 5 6 27 {3} 25 74 26 {2} 25 83 333 {34} 45 95 529 {54} 5 9 686 {7} 7 8 PCD 49.5 63 7 82 96 34 53 72 98 28 A 79 79.6 94.3 7.2 28.5 48.9 74 97.5 228.8 265.8 39.2 B 25.4 25.4 28.7 33.5 4. 47.8 57.2 63.5 76.2 88.9.6 E 6. 6.6 8.3.2.7.7 6.8 7 2.6 23.9 27.2 H 34 46 5 6 7 84 6 8 37 56 69 J 28.2 28.8 36.9 4.2 46.3 53.3 59.6 7.5 76.4 88 6 K 67.5 8 93 4 26 43 68 94 24 246 276 T 5.5 6 23 2 23 29.5 2 32.5 9.5 24.5 4 Reference Number System (Example) NEF25W - N35J X N4E - JT4.2 Spacer Type Type of Hub N: Standard Hub K: Extended-Dia. Hub L: Long Hub B: Square Hub * See p. 2. Bore Diameter (Rough bore: R) Dimension ÒJÓ JT : Single Plate Spacer Shaft Coupling Method J: Keyway of new JIS normal type E: Keyway of old JIS Type 2 C: Clamp (See p. 23) P2: Power-Lock (See p. 26) T: Taper Shaft Bore (See p. 45) *: Indicate the smaller bore diameter first. *2: Indicate the rough bore (symbol R ) first. 2
TRANSMISSION CAPACITY / DIMENSIONS NEF Series: Single Type Couplings The NEF Series Single Type employs a single disk set, enabling absorption of angular eccentricity only. This type cannot absorb parallel misalignment, so it is recommended only for applications that enable precision centering of the servo motor for NC machining centers, NC wood machining tools, etc. Under general centering conditions, use of the Spacer Type is recommended. Standard HubStandard Hub NEFS -N XN Extended-Dia. HubStandard Hub NEFS -K XN Standard hub Reamer bolt Washer A Washer B Disk U-nut Spacer Standard hub Extended-dia. hub Reamer bolt Washer A Washer B Disk U-nut Set screw Long HubStandard Hub NEFS -L XN Extended-Dia. HubExtended-Dia. Hub NEFS -K XK Long hub Standard hub Reamer bolt Washer A Washer B Disk U-nut Set screw Extended-dia. hub Reamer bolt Washer A Washer B Disk U-nut Set screw Extended-Dia. HubLong Hub NEFS -K XL Long HubLong Hub NEFS -L XL Extended-dia. hub Long hub Reamer bolt Washer A Washer B Disk U-nut Set screw Long hub Reamer bolt Washer A Washer B Disk U-nut Set screw 2
Single Unit: mm Allowable Torque Nm{kfm} Max. Rotation Speed r/min Rough Bore d Standard Stock Bore Dia. Range Keyway Max. Shaft Dia. Standard Hub Long Hub Extended- Dia. Hub Torsional Stiffness Nm/rad{kfm/rad} Axial Spring Constant N/mm{kf/mm} NEF2S 9.6{ 2} 2 8 425 2 25.96 4 {.2 4 } 68.6{ 7.} 44.9 NEF4S 39.2{ 4} 2 8 22 23 23 29 2.45 4 {.25 4 } 4.2{ 4.} 56.9 7.5 NEFS 98 { } 2 23 32 32 4 8.82 4 {.9 4 } 58.8{ 6 } 57.4 72 NEF8S 76 { 8} 8 2 435 35 35 42 5.7 4 {.6 4 } 27 {3 } 65.7 82 NEF25S 245 { 25} 5 5 842 42 42 48 25.5 4 { 2.6 4 } 57 {6 } 78.2 94.7 NEF45S 44 { 45} 3 5 255 5 5 6 44. 4 { 4.5 4 } 29 {22.3} 93.9 2.8 NEF8S 784 { 8} 2 5 36 6 6 7 78.4 4 { 8 4 } 37 {3.3} 7.3 29.5 NEF3S 27{3} 25 357 74 74 8 4.7 5 {5 4 } 355 {36.2} 3.2 59 NEF2S 26{2} 8 25 83 83 9 22.5 5 {23 4 } 44 {45 } 44 2.5 NEF34S 333{34} 75 45 95 95 32.3 5 {33 4 } 47 {48 } 74 237.8 NEF54S 529{54} 34 5 9 9 2 43. 5 {44 4 } 549 {56 } 2.7 252.8 NEF7S 686{7} 3 5 8 8 3 58.8 5 {6 4 } 588 {6 } 23.4 278.8 A A2 EMER-FLEX A3 B BL E H HL K T Allowable Misalignment Angular Misalignment de Axial Displacement (Note) Weight k Moment of Inertia k m 2 GD2 {kf cm 2 } NEF2S 2 4.9 32 45 57.8.33.23 4 { 4.9} NEF4S 86. 25.4 4 6. 34 5 67.5 5.5.8.6 2 4 { 8 } NEFS 86.6 25.4 4 6.6 46 66 8 6..8 6 4 { 25 } NEF8S 98.3 28.7 45 8.3 5 66 93 23.2.3 3 4 { 53 } NEF25S.2 33.5 5.2 6 78 4 9.4.8 22 4 { 89 } NEF45S 3.7 4. 6.7 7 92 26 23.6 4.3 56 4 { 224 } NEF8S 5.7 47.8 7.7 84 4 43 29.5.8 6.9 4 { 44 } NEF3S 86.8 57.2 85 6.8 6 29 68 2 2.5.5 27 4 { 8 } NEF2S 257 63.5 2 7. 8 47 94 32.5 2.7 6.4 52 4 { 28 } NEF34S 3.6 76.2 4 2.6 37 66 24 9.5 3.3 28. 88 4 { 352 } NEF54S 33.9 88.9 4 23.9 56 9 246 24.5 3.8 33 75 4 { 7 } NEF7S 327.2.6 5 27.2 69 29 276 4 4. 37 325 4 { 3 } Notes. See p. 2 for extended diameter and long hub dimensions. With the long hub, the overall length is extended because dimension B is lengthened. 2. All stocked models are manufactured with pilot bores. Models NEF4W through NEF3W have been stocked with shaft bores machined within the above standard stock bore diameter range. (New JIS key, normal type) 3. The maximum rotation speed depends on the transmission capacity of the coupling. No balance adjustment has been conducted. 4. The weight, moment of inertia and GD 2 are the values at maximum bore diameter (keyway). For the extended-diameter hub and the long hub, add the individual values listed below. 5. The allowable axial displacement is based on the assumption that the angular misalignment is. 6. Check the key surface pressure in accordance with your operating conditions (see p. 8). The hub material is S45C. Reference Number System (Example) NEF8S - N3J X K4E Single Type Type of Hub N: Standard Hub K: Extended-Dia. Hub L: Long Hub B: Square Hub * See p. 2. Bore Diameter (Rough bore: R) Shaft Coupling Method J: Keyway of new JIS normal type E: Keyway of old JIS Type 2 C: Clamp (See p. 23) P2: Power-Lock (See p. 26) T: Taper Shaft Bore (See p. 45) *: Indicate the smaller bore diameter first. *2: Indicate the rough bore (symbol R ) first. 22
TRANSMISSION CAPACITY / DIMENSIONS NEF Clamp Method: Spacer Type Couplings The NEF Clamp Method enables friction coupling to a shaft, with one bolt tightened in each hub. Compared to the Power-Lock Method (see p. 26) that also employs friction coupling, these couplings can reduce axial dimension, saving installation space. The Spacer Type can absorb all types of misalignment, while the Single Type coupling can handle all misalignments except parallel misalignment. Spacer Type NEF2W standard hub NEF4//8/25/45W standard hub NEF/8/25W square hub NEF2W extended-diameter hub NEF4/45W extended-diameter hub Spacer Type Notes Allowable Torque Nm{kfm} Max. Rotation Speed r/min Standard Stock Bore Diameter Max. Bore Dia. Torsional Stiffness Nm/rad {kfm/rad} Axial Spring Constant N/mm {kf/mm} NEF2W 9.6{ 2} 2!!2!5!892222425 25. 4 {. 4 } 34.3 { 3.5} 63. 2 NEF4W 39.2{ 4} 2!2!4!5!6!792222425 26.8 4 {.2 4 } 2.6 { 2.} 86.8 25.4 NEFW 98 {} 2!5!8@@2 4 5 8 5 35 3.92 4 {.4 4 } 29.4 { 3 } 89.8 25.4 NEF8W 76 {8} 8!9@2@5 8 2 5 35 7.84 4 {.8 4 } 63.7 { 6.5} 4.4 28.7 NEF25W 245 {25} 5 @5# 2 5 8 2 42 2.7 4 {.3 4 } 78.4 { 8 } 2 33.5 NEF45W 44 {45} 3 ##8$$245555 55 2.6 4 {2.2 4 } 9 {.} 44.2 4. E H HL HS J K U T A Unit: mm. The maximum rotation speed depends on the transmission capacity of the coupling. No balance adjustment has been conducted. 2. The circled standard stock bore diameters are for the standard hubs, the diameters in squares are for the square hub, and unmarked diameters are for the extended-diameter hubs. 3. The weight, moment of inertia and GD 2 are the values at maximum bore diameter for the round hub. Values in parentheses for the NEF2/4/45 apply to the extended-diameter hub. Values in parentheses for the NEF/8/25 apply to the square hub. 4. The allowable axial displacement is based on the assumption that the angular misalignment is. 5. To prevent the clamp bolt from loosening, the square hub type uses a U-nut, while other types use a NYLOCK bolt. Weight k Moment of Inertia kcm 2 GD2 {kfcm 2 } B Allowable Misalignment Angular Misalignment Parallel Axial de Misalignment Displacement NEF2W 4.9 32 45 23 57.45(.46).68(.9) 6.72( 7.6) 2.3.6 NEF4W 6. 34 5 36 67.5 5.5.28(.29) 5.2 ( 5.7 ) 2.9 ( 22.7 ) 2.5.6 NEFW 6.6 46 47 39 8 66 6.52(.35).7 (. ) 46.7 ( 44. ) 2.55 2. NEF8W 8.3 5 49 47 93 68 23 2.45(2.24) 24.8 ( 23.6 ) 99. ( 94.3 ) 2.6 2.4 NEF25W.2 6 6 53 4 78.3 9 3.3 (3. ) 4.8 ( 38.5 ) 63 (54 ) 2.7 2.8 NEF45W.7 7 92 62 26 23 6.9 (7. ) 95.8 (4 ) 383 (46 ) 2.8 3.2 23
NEF Clamp Method: Single Type Couplings Single Type NEF2S/4S/S/8S/25S/45S standard hub 4S/45S extended-diameter hub NEF2S/4S/45S extended-diameter hub 8S/25S NEFS/8S/25S square hub square hub EMER-FLEX Single Type Notes Allowable Torque Nm{kfm} Max. Rotation Speed r/min Standard Stock Bore Diameter E H HL HS K U T Max. Bore Dia. Weight k Torsional Stiffness Nm/rad {kfm/rad} Moment of Inertia kcm 2 Axial Spring Constant N/mm {kf/mm} NEF2S 9.6{ 2} 2!!2!5!892222425 25.96 4 {.2 4 } 68.6{ 7.} 44.9 2 NEF4S 39.2{ 4} 2!2!4!5!6!792222425 26 2.45 4 {.25 4 } 4.2{ 4.} 56.9 25.4 NEFS 98 {} 2!5!8@@2 4 5 8 5 35 8.82 4 {.9 4 } 58.8{ 6 } 57.4 25.4 NEF8S 76 {8} 8!9@2@5 8 2 5 35 5.7 4 {.6 4 } 27 {3 } 65.7 28.7 NEF25S 245 {25} 5 @5# 2 5 8 2 42 25.5 4 {2.6 4 } 57 {6 } 78.2 33.5 NEF45S 44 {45} 3 ##8$$245555 55 44. 4 {4.5 4 } 29 {22.3} 93.9 4. GD2 kfcm 2 NEF2S 4.9 32 45 57.33(.39).23(.56) 4.9 ( 6.24).8 NEF4S 6. 34 5 67.5 5.5.78(.79) 2.78( 3.23). ( 2.9).8 NEFS 6.6 46 47 8 66 6.92(.8) 6.43( 5.85) 25.7 ( 23.4). NEF8S 8.3 5 49 93 68 23.45(.24) 3.5 ( 2.2) 54. ( 48.8).2 NEF25S.2 6 6 4 78.3 9 2. (.8 ) 23 ( 2.9) 92 ( 83.4).4 NEF45S.7 7 92 26 23 4.6 (4.7 ) 57.5 ( 65.8) 23 ( 263).6 A Unit: mm B Allowable Misalignment Angular Misalignment Axial Displacement de. The maximum rotation speed depends on the transmission capacity of the coupling. No balance adjustment has been conducted. 2. The circled standard stock bore diameters are for the standard hubs, the diameters in squares are for the square hub, and unmarked diameters are for the extended-diameter hubs. 3. The weight, moment of inertia and GD 2 are the values at maximum bore diameter for the round hub. Values in parentheses for the NEF2/4/45 apply to the extended-diameter hub. Values in parentheses for the NEF/8/25 apply to the square hub. 4. The allowable axial displacement is based on the assumption that the angular misalignment is. 5. To prevent the clamp bolt from loosening, the square hub type uses a U-nut, while other types use a NYLOCK bolt. Reference Number System (Example) NEF8W - N25C X B3C Type S: Single Type W: Spacer Type Type of Hub N: Standard Hub K: Extended-Dia. Hub L: Long Hub B: Square Hub * See p. 2. Bore Diameter (Rough bore: R) Shaft Coupling Method J: Keyway of new JIS normal type (See p. 5) E: Keyway of old JIS Type 2 (See p. 5) C: Clamp P2: Power-Lock (See p. 26) *The number indicates the number of Power-Locks. T: Taper Shaft Bore (See p. 45) *: Indicate the smaller bore diameter first. *2: Indicate the rough bore (symbol R ) first. 24
TRANSMISSION CAPACITY / DIMENSIONS NEF Clamp Method Clamp Transmission Torque When coupling to a shaft, the clamp bolt should be tightened using a torque wrench to the appropriate torque listed below. Depending on the bolt size and bore diameter, the clamp transmission torque may be less than the allowable torque of the coupling. In this case, the clamp transmission torque represents the coupling transmission torque, so take caution in selecting the torque. Clamp Shaft Bore Diameter and Torque Bore Diameter mm 2 4 5 6 7 8 9 2 22 24 25 28 3 32 35 NEF2 Bolt Size M4 M4 M4 M4 M4 M4 M4 M4 M4 M4 M4 M4 M4 Tightening Torque N-m {kf-m} Transmission Torque N-m {kf-m} 4.2 {.4} 8.6 {.9} 4.2 {.4} 27.9 {2.85} 4.2 {.4} 26.8 {2.73} 4.2 {.4} 32.5 {3.32} 4.2 {.4} 37.2 {3.8} 4.2 {.4} 39.2 {4.} 4.2 {.4} 4.9 {4.7} 4.2 {.4} 44.3 {4.52} 4.2 {.4} 54.5 {5.56} 4.2 {.4} 56.5 {5.77} 4.2 {.4} 59.8 {6.} 4.2 {.4} 62.6 {6.39} 4.2 {.4} 64.2 {6.55} Bolt Size M4 M4 M4 M4 M4 M4 M4 M4 M4 M4 M4 NEF4 Tightening Torque N-m {kf-m} 4.2 {.4} 4.2 {.4} 4.2 {.4} 4.2 {.4} 4.2 {.4} 4.2 {.4} 4.2 {.4} 4.2 {.4} 4.2 {.4} 4.2 {.4} 4.2 {.4} Transmission Torque N-m {kf-m} 7.6 {.8} 3. {3.7} 34.3 {3.5} 37.2 {3.8} 4.2 {4.} 42. {4.3} 54.9 {5.6} 57.8 {5.9} 62. {6.33} 65.7 {6.7} 68. {6.94} Bolt Size M6 M6 M6 M6 M6 M6 M6 M6 M6 M6 M6 M6 M5 NEF Tightening Torque N-m {kf-m} Transmission Torque N-m {kf-m} 3.7 {.4} 85 {8.68} 3.7 {.4} 94 {9.6} 3.7 {.4} 3 {.5} 3.7 {.4} {.3} 3.7 {.4} 3 {.5} 3.7 {.4} 9 {2.} 3.7 {.4} 27 {3.} 3.7 {.4} 63 {6.6} 3.7 {.4} 77 {8.} 3.7 {.4} 8 {8.5} 3.7 {.4} 89 {9.3} 3.7 {.4} 82 {8.6} 8.33 {.85} 46 {4.9} Bore Diameter mm 5 6 7 8 9 2 22 24 25 28 3 32 35 38 4 42 45 48 5 52 55 NEF8 Bolt Size M6 M6 M6 M6 M6 M6 M6 M6 M6 M6 M6 M6 M6 Tightening Torque N-m {kf-m} Transmission Torque N-m {kf-m} 3.7 {.4} 68 {6.97} 3.7 {.4} 83 {8.45} 3.7 {.4} 9 {9.8} 3.7 {.4} {.2} 3.7 {.4} 9 {.} 3.7 {.4} 3 {.5} 3.7 {.4} 26 {2.9} 3.7 {.4} 36 {3.9} 3.7 3.7 3.7 3.7 3.7 {.4} {.4} {.4} {.4} {.4} 43 88 96 22 23 {4.6} {9.2} {2.} {2.6} {2.7} Bolt Size M8 M8 M8 M8 M8 M6 M6 M6 NEF25 Tightening Torque N-m {kf-m} Transmission Torque N-m {kf-m} Bolt Size 34.3 34.3 34.3 34.3 34.3 3.7 3.7 3.7 {3.5} {3.5} {3.5} {3.5} {3.5} {.4} {.4} {.4} 276 3 38 373 49 23 245 25 {28.2} {3.6} {32.4} {38.} {4.7} {23.5} {25.} {25.5} M8 M8 M8 M8 M8 M8 M8 M8 M8 M8 M8 NEF45 Tightening Torque N-m {kf-m} Transmission Torque N-m {kf-m} 34.3 {3.5} 363 {37.} 34.3 {3.5} 372 {38.} 34.3 {3.5} 393 {4.} 34.3 34.3 34.3 34.3 {3.5} {3.5} {3.5} {3.5} 46 429 44 544 {42.4} {43.8} {44.9} {55.5} 34.3 {3.5} 562 {57.3} 34.3 {3.5} 574 {58.6} 34.3 {3.5} 582 {59.4} 34.3 {3.5} 6 {6.2} Boldface numbers indicate products in stock. Recommended shaft bore tolerance of clamp hub = h7 * Note: For 35 bore diameters, the recommended shaft bore tolerance is (+. to ) or (+. to -.5). 25
TRANSMISSION CAPACITY / DIMENSIONS Single-Side Power-Lock: Single Type Couplings NEF POWER-LOCK Series couplings offer machined shaft bores and incorporate a Power-Lock (friction coupling tool) and pressure flange set on one side, with the other side used for the keyway shaft bore. The Spacer Type can absorb all types of misalignment, while the single type coupling can handle all misalignments except for parallel misalignment. Single Type NEFS, NEF8S, NEF25S 2-Q x R, Drilled Long Hub Type NEFS-L Taper shaft bore 2 - Q x R, Drilled L-hub EMER-FLEX Pressure flange Power-Lock Square hub U-nut Washer A Disk Washer B Reamer bolt Standard hub Pressure bolt Single Type NEF4S 2 - Q x R, Drilled Long Hub Type NEF4S-L Taper shaft bore 2 - Q x R, Drilled G D2 D H K C F E V B A B Allowable Torque Nm {kfm} Torsional Stiffness r/min Rough Bore * Standard Stock * Max. Shaft Dia. Torsional Stiffness Shaft Dia. Power- Nm/rad {kfm/rad} Lock Keyway Axial Spring Constant N/mm {kf/mm} Unit: mm A B C NEF4S 39.2 { 4} 2 8-22 22 23 2.45 4 {.25 4 } 4.2 { 4.} 67.9 25.4 8 NEFS 98 {} 2 4-35 35 32 8.8 4 {.9 4 } 58.8 { 6.} 7.4 25.4 NEF8S 76 {8} 8 2 4-35 35 35 5.7 4 {.6 4 } 27 {3 } 78.7 28.7 NEF25S 245 {25} 5 5 8-42 42 42 25.5 4 {2.6 4 } 57 {6 } 93.2 33.5 2 F E G H K L M N Q R U Allowable Misalignment Angular (Note) Misalignment Axial de Displacement Weight k Moment of Inertia kcm 2 GD 2 {kfcm 2 } NEF4S 3 6. 52 34 67.5 4 M622r 4 5.8.76 2.85 {.4} NEFS 3 6.6 66 46 8 54 M622r 4 7 66..95 7.38 { 29.5} NEF8S 3 8.3 66 5 93 54 M622r 4 7 68.2.5 4.5 { 57.8} NEF25S 3.2 78 6 4 64 M828r 4 8 3 78.3.4 2.2 26 {4 } Long Hub Type (Refer to the table above for transmission capacity and maximum shaft diameter.) A B C E F B' H 6 / Taper Shaft Bore D D2 V T W Long Hub Rough Bore Dia. NEF4S-L 82.5 25.4 8 6. 3 4 34 26 6.5 9.4 +.2 5E9 +.5 52 67.5 +.2 8 NEFS-L 85 25.4 6.6 3 4 46 3 66 8 Notes. * Both the hub and the pressure flange have machined shaft bores for double Power-Locks within the standard stock shaft diameter range. Select a Power-Lock shaft diameter from the table on p. 3. 2. * The maximum shaft diameter includes a margin for mounting the Power-Lock. 3. The maximum rotation speed depends on the transmission capacity of the coupling. No balance adjustment has been conducted. 4. The weight, moment of inertia and GD 2 are the values at maximum bore diameter. 5. The allowable axial displacement is based on the assumption that the angular misalignment is. 6. NEF45 or larger sizes can be also manufactured with a Power-Lock. Contact for drawings. G K 26
TRANSMISSION CAPACITY / DIMENSIONS Single-Side Power-Lock: Spacer Type Couplings Spacer Type NEFWNEF8WNEF25W Spacer Type NEF4W 2-Q x R, Drilled Extended-dia. hub L E E C B J B Pressure flange Power-Lock Square hub Reamer bolt Washer B Disk Washer A U-nut Spacer Standard hub Pressure bolt F A Spacer Type with Single-Side Power-Lock Allowable Torque Nm {kfm} Max. Rotation Speed r/min Rough Bore * Standard Stock Shaft Dia. * Max. Shaft Dia. Torsional Stiffness Power- Keyway Nm/rad {kfm/rad} Lock Axial Spring Constant N/mm {k f/mm} A B C NEF4W 39.2 { 4} 2 8 22 22 23.8 4 {.2 4 } 2.6 {2.} 97.8 25.4 8 NEFW 98 {} 2 435 35 32 3.92 4 {.4 4 } 29.4 {3 } 2.8 25.4 NEF8W 76 {8} 8 2 435 35 35 7.84 4 {.8 4 } 63.7 {6.5} 7.4 28.7 NEF25W 245 {25} 5 5 842 42 42 2.7 4 {.3 4 } 78.4 {8 } 35 33.5 2 Allowable Misalignment Weight Moment GD K Q R U of Inertia 2 F E G H J L M N Angular (Note) Misalignment Parallel Axial Misalignment k kcm 2 {kfcm 2 } de Displacement NEF4W 3 6. 52 34 36 67.5 4 M622r 4 4 7 2.5.6.2 6.2 { 24.9} NEFW 3 6.6 66 46 39 8 54 M622r 4 7 66 2.55 2..6 3 { 52 } NEF8W 3 8.3 66 5 47 93 54 M622r 4 7 68 2.6 2.4 2.5 26 {3 } NEF25W 3.2 78 6 53 4 64 M828r 4 8 3 78.3 2.7 2.8 3.4 44 {78 } Notes. * Both the hub and the pressure flange have machined shaft bores for double Power-Locks within the standard stock shaft diameter range. Select a Power-Lock shaft diameter from the table on p. 3. 2. * The maximum shaft diameter includes a margin for mounting the Power-Lock. 3. The maximum rotation speed depends on the transmission capacity of the coupling. No balance adjustment has been conducted. 4. The weight, moment of inertia and GD 2 are the values at maximum bore diameter. 5. The allowable axial displacement is based on the assumption that the angular misalignment is. 6. NEF45 or larger sizes can be also manufactured with a Power-Lock. Contact for drawings. Reference Number System (Example) NEFW - L6T X B3P2 Type S: Single Type W: Spacer Type Type of Hub N: Standard Hub K: Extended-Dia. Hub L: Long Hub B: Square Hub * See p. 2. Bore Diameter (Rough bore: R) Shaft Coupling Method J: Keyway of new JIS normal type (See p. 5) E: Keyway of old JIS Type 2 (See p. 5) C: Clamp (See p. 23) P2: Power-Lock * The number indicates the number of power locks. T: Taper Shaft Bore (See p. 45) *: Indicate the smaller bore diameter first. *2: Indicate the rough bore (symbol R ) first. 27
Dual-Side Power-Lock: Single Type couplings The dual-side Power-Lock couplings in the NEF POWER LOCK Series offer machined shaft bores and incorporate Power-Locks (friction coupling tools) and pressure flange sets on both sides, with shaft bores machined. This type of coupling is suitable for applications using servo motors. We maintain large stocks of products with a machined shaft bore. The Spacer Type can absorb all types of misalignment, while the single type coupling can handle all misalignments except for parallel misalignment. EMER-FLEX Single Type Z 2-Q x R, Drilled D G K X Square hub Reamer bolt Disk Washer A Washer B U-nut Power-Lock Pressure flange Pressure bolt 2 - Q x R, Drilled U N M C B E B C H Y F A F Viewed in the direction of arrows Z-Z Cross-section X-O-Y Disk bore diameter Allowable Torque Nm {kfm} Max. Rotation Speed r/min * Standard Stock Shaft Dia. * Max. Shaft Dia. Notes. * Both the hub and the pressure flange have machined shaft bores for double Power-Locks within the standard stock shaft diameter range. Select a Power-Lock shaft diameter from the table on p. 3. 2. * The maximum shaft diameter includes a margin for mounting the Power-Lock. 3. The maximum rotation speed depends on the transmission capacity of the coupling. No balance adjustment has been conducted. Reference Number System (Example) Torsional Stiffness Nm/rad {kfm/rad} Unit: mm A B C DD NEF4S 39.2 { 4} 2 22 22 2.45 4 {.25 4 } 4.2 { 4.} 75.9 25.4 8 29 NEFS 98 {} 2 435 35 8.8 4 {.9 4 } 58.8 { 6.} 83.4 25.4 37 NEF8S 76 {8} 8 435 35 5.7 4 {.6 4 } 27 {3 } 9.7 28.7 39 NEF25S 245 {25} 5 842 42 25.5 4 {2.6 4 } 57 {6 } 8.2 33.5 2 45 F E G H K L M N Q R NEF4S 3 6. 52 67.5 4 M622r 4 5 NEFS 3 6.6 66 47 8 54 M622r 4 7 NEF8S 3 8.3 66 49 93 54 M622r 4 7 NEF25S 3.2 78 6 4 64 M828r 4 8 3 NEF8S - B3P2 X B35P2 U Axial Spring Constant N/mm {k f/mm} Allowable Misalignment Angular (Note) Misalignment Axial de Displacement Weight 4. The weight, moment of inertia and GD 2 are the values at maximum bore diameter. 5. The allowable axial displacement is based on the assumption that the angular misalignment is. 6. NEF45 or larger sizes can be also manufactured with a Power-Lock. Contact for drawings. k Moment of Inertia kcm 2 GD 2 {kfcm 2 }.8.9 3. {.9} 66..2 8.25 { 33 } 68.2.7 4.8 { 59 } 78.3.4 2.7 28.8 {5 } Type S: Single Type W: Spacer Type Type of Hub N: Standard Hub K: Extended-Dia. Hub L: Long Hub B: Square Hub * See p. 2. Bore Diameter (Rough bore: R) Shaft Coupling Method J: Keyway of new JIS normal type (See p. 2) E: Keyway of old JIS Type 2 (See p. 2) C: Clamp (See p. 23) P2: Power-Lock * The number indicates the number of power locks. T: Taper Shaft Bore (See p. 45) *: Indicate the smaller bore diameter first. *2: Indicate the rough bore (symbol R ) first. 28
TRANSMISSION CAPACITY / DIMENSIONS Dual-Side Power-Lock: Spacer Type Couplings Spacer Type NEFW, NEF8W, NEF25W Pressure flange Power-Lock Square hub Spacer U-nut Washer A Disk Washer B Reamer bolt Pressure bolt 2-Q x R, Drilled Spacer Type NEF4W L L C F B E J A E B C F Max. Allowable Torque Rotation Nm {kfm} Speed r/min Rough Bore * Standard Stock * Max. Shaft Dia. Shaft Dia. Torsional Stiffness Nm/rad {kfm/rad} Axial Spring Constant N/mm {k f/mm} A Unit: mm * DD F NEF4W 39.2 { 4} 2 8-22 22.8 4 {.2 4 } 2.6 {2.} 8.8 25.4 8 29 3 NEFW 98 {} 2 4-35 35 3.92 4 {.4 4 } 29.4 {3 } 5.8 25.4 37 3 NEF8W 76 {8} 8 2 4-35 35 7.84 4 {.8 4 } 63.7 {6.5} 3.4 28.7 39 3 NEF25W 245 {25} 5 5 8-42 42 2.7 4 {.3 4 } 78.4 {8 } 5 33.5 2 45 3 B C J E G H K L M N Q R U Allowable Misalignment Notes. * Both the hub and the pressure flange have machined shaft bores for double Power-Locks within the standard stock shaft diameter range. Select a Power-Lock shaft diameter from the table on p. 3. 2. * The maximum shaft diameter includes a margin for mounting the Power-Lock. 3. The maximum rotation speed depends on the transmission capacity of the coupling. No balance adjustment has been conducted. 4. The weight, moment of inertia and GD 2 are the values at maximum bore diameter. 5. The allowable axial displacement is based on the assumption that the angular misalignment is. 6. NEF45 or larger sizes can be also manufactured with a Power-Lock. Contact for drawings. Angular Misalignment de (Note) Axial Displacement Weight k Moment of Inertia kcm 2 NEF4W 36 6. 52 67.5 4 M622r 4 4 7.5 2.6.4 7. { 28.3} NEFW 39 6.6 66 47 8 54 M622r 4 7 66.55 2 2. 7.9 4 { 58 } NEF8W 47 8.3 66 49 93 54 M622r 4 7 68.6 2 2.4 2.7 27 {9 } NEF25W 53.2 78 6 4 64 M828r 4 8 3 78.3.7 2 2.8 3.9 47 {89 } Parallel Misalignment GD 2 {kfcm 2 } 29
Pressure Flange Set with Rough Bore This pressure flange mounts a Power-Lock to a square hub (see p. 2) and is convenient for servo motor or ball screw applications. The pressure flange set is comprised of special pressure flanges (2 pieces) and pressure bolts (8 pieces). Use the pressure flange set together with the square hub. (For NEF4, use the extended-diameter hub.) The pressure bolts are specially designed to provide a tensile strength of.9. EMER-FLEX A B C Rough Bore Dia. di do G L N M Q R Unit: mm Compatible Shaft Dia. Bolt Size/Quantity Weight k Moment of Inertia kcm 2 GD 2 {kfcm 2 } Notes NEF4 -F 4 6 8. 25.8 52 4 4 6.5 5 NEF -F NEF8 -F 6 6 3. 39.8 66 54 4 6.6 7 NEF25 -F 8 6 2 8.2 47.8 78 64 4 9 8 3. All models are in stock. 2. The weight, moment of inertia and GD 2 are the values for one set, including the pressure flanges (maximum bore diameter) and pressure bolts. 3. For recommended machining dimensions, see p. 44. -22 M6 x 22r (.9), 4 pcs..4.48 {.9} 4-35 M6 x 22r (.9), 8 pcs..4 2.75 { } 8-42 M8 x 28r (.9), 8 pcs..8 8.25 {33 } Power-Locks for NEF45 or larger sizes can be also machined. The extended-diameter hub is used for these sizes. Reference Number System (Example) NEF45W - K45P2 X K5P2 Type S: Single Type W: Spacer Type Type of Hub N: Standard Hub K: Extended-Dia. Hub L: Long Hub B: Square Hub * See p. 2. Bore Diameter (Rough bore: R) Shaft Coupling Method J: Keyway of new JIS normal type (See p. 5) E: Keyway of old JIS Type 2 (See p. 5) C: Clamp (See p. 23) P2: Power-Lock * The number indicates the number of power locks. T: Taper Shaft Bore (See p. 45) *: Indicate the smaller bore diameter first. *2: Indicate the rough bore (symbol R ) first. Pressure Flange Dimensions for NEF45 or Larger Sizes A B C Finished Bore Dia. di do G L N M Q R Unit: mm Compatible Shaft Dia. Size (Note) Pressure Bolt Quantity NEF 45 -F 23 8 5 92 78 4 9 5 8-5 M 828r.9 4 See the Recommended NEF 8 -F 24 8 6 4 88 4 2 5 2-6 M35r.9 4 Shaft Bore Machining NEF3 -F 27 9 8 Methods table on p. 44. 29 2 4 2 5 28-75 M4r.9 4 NEF2 -F 29 9 2 47 27 4 4 2 35-85 M245r.9 4 Note: (.9) indicates the bolt strength rating. For the relationship between the transmission torque for the Power-Lock Type couplings and each shaft bore diameter, see p. 3. In addition to the EL Series Power-Lock Type couplings, other Power-Lock Types can be also manufactured. Contact us for details. 3
TRANSMISSION CAPACITY / DIMENSIONS Combinations with Power-Lock The following table lists the transmission torque of a single Power-Lock. To use double or triple Power-Locks, multiply the transmission torque by the following factor: Transmission torque of double Power-Locks = Transmission torque of a single Power-Lock x.55 Transmission torque of triple Power-Locks = Transmission torque of a single Power-Lock x.85 The tightening torque for pressure bolts is constant, regardless of the number of bolts. The values in the table below apply to Power-Locks with a pressurized inner ring. Contact us to use a Power-Lock with a pressurized outer ring. Shaft Dia. 2 3 4 5 6 7 8 9 2 22 24 25 28 3 32 35 36 38 4 42 45 48 5 55 56 6 63 65 7 75 8 85 NEF4 M6 3.97 {.4} 4.44 {.45} 4.8 {.49} 7.74 {.79} 8.72 {.89} 9.2 {.92} 9.2 {.94} 9.5 {.97}.9 {.}. {.3} 9.7 {.99} Pressure Bolt Tightening Torque NEF M6 7.74 {.79} 8.72 {.89} 9.2 {.92} 9.2 {.94} 9.5 {.97}.9 {.}. {.3}. {.3}.7 {.9} 2.4 {.27} 2.9 {.32} 3. {.33} 2.2 {.24}.5 {.7} NEF8 M6 7.74 {.79} 8.72 {.89} 9.2 {.92} 9.2 {.94} 9.5 {.97}.9 {.}. {.3}. {.3}.7 {.9} 2.4 {.27} 2.9 {.32} 3.7 {.4} 3.7 {.4} 2.4 {.27} NEF25 M8 2.9 {.32} 4.8 {.5} 5. {.54} 5. {.54} 5.9 {.62} 7. {.73} 7.6 {.8} 9. {.95} 9.6 { 2.} 24.9 { 2.54} 26. { 2.65} 25.9 { 2.64} 27.9 { 2.85} 24.9 { 2.54} NEF45 M8 2.9 {.32} 4.8 {.5 } 5. {.54} 5. {.54} 5.9 {.62} 7. {.73} 7.5 {.79} 9. {.95} 9.9 { 2.3} 24.8 { 2.53} 26. { 2.65} 27. { 2.75} 28.8 { 2.94} 3.3 { 3.9} 34.3 { 3.5} 34.3 { 3.5} 34.3 { 3.5} Note: Triple Power-Locks cannot be used for the following models and shaft diameter ranges. NEF4 NEF NEF8 Shaft Dia. Range 4-22 4-35 Nm {kfm} NEF8 NEF3 M M 8.7 {.9} 8.6 {.9} 9.7 { 2.} 2. { 2.4} 2.8 { 2.22} 23.6 { 2.4} 24.7 { 2.52} 3.8 { 3.4} 32.2 { 3.28} 33.4 { 3.4} 36. { 3.68} 38.6 { 3.94} 42.4 { 4.33} 45.6 { 4.66} 48. { 4.9} 55. { 5.6} 59. { 6.2} 62.6 { 6.39} 2.8 { 2.22} 23.6 { 2.4} 24.7 { 2.52} 3.8 { 3.4} 32.2 { 3.28} 33.4 { 3.4} 36. { 3.68} 38. { 3.88} 4.6 { 4.5} 42.7 { 4.36} 44.2 { 4.5} 48. { 4.9} 49.9 { 5.} 53.6 { 5.47} 56.7 { 5.78} 58.8 { 6.} 67. { 6.84} 67.6 { 6.9} 22-35 Recommended Shaft Diameter Tolerance of Power-Lock38h6 4 h8 3 Power-Lock Transmission Torque Nm {kfm} NEF2 Q ty NEF4 NEF NEF8 NEF25 NEF45 NEF8 NEF3 M2 36.5 { 3.73} 38.2 { 3.9} 39.7 { 4.5} 46.5 { 4.75} 49.5 { 5.5} 54.5 { 5.56} 57. { 5.82} 58.8 { 6.} 63.3 { 6.45} 65.2 { 6.65} 69.2 { 7.6} 72.4 { 7.39} 74.7 { 7.62} 82.4 { 8.4} 89.6 { 9.5} 4 {.6} 6 {.8} 9.33 {.95} 4.7 {.5} 7.6 {.8} 3.4 { 3.} 34.3 { 3.5} 39.2 { 4.} 45. { 4.6} 5. { 5.} 55.9 { 5.7} 6.7 { 6.3} 63.7 { 6.5} 3.4 { 3.} 35.3 { 3.6} 4.2 { 4.} 45. { 4.6} 5. { 5.2} 56.8 { 5.8} 62.7 { 6.4} 75.5 { 7.7} 9.2 { 9.2} 98. {.} 23 { 2.5} 29 { 3.2} 28 { 3.} 9 {.} 3.4 { 3.} 35.3 { 3.6} 4.2 { 4.} 45. { 4.6} 5. { 5.2} 56.8 { 5.8} 62.7 { 6.4} 75.5 { 7.7} 9.2 { 9.2} 98. {.} 23 { 2.5} 37 { 4.} 48 { 5.} 36 { 3.9} 5. { 5.2} 56.8 { 5.8} 62.7 { 6.4} 75.5 { 7.7} 9.2 { 9.2} 98. {.} 23 { 2.5} 4 { 4.4} 6 { 6.4} 28 { 22.2} 23 { 23.5} 244 { 24.9} 269 { 27.4} 236 { 24.} 5. { 5.} 55.9 { 5.7} 6.7 { 6.3} 75.5 { 7.7} 9.2 { 9.2} 97. { 9.9} 23 { 2.5} 4 { 4.3} 6 { 6.3} 27 { 22.} 23 { 23.5} 256 { 26.} 279 { 28.5} 36 { 32.3} 327 { 33.3} 356 { 36.4} 376 { 38.4} 62.7 { 6.4} 75.5 { 7.7} 9.2 { 9.2} 98. {.} 23 {2.5} 4 { 4.4} 6 { 6.4} 27 { 22.2} 23 { 23.5} 256 { 26.} 282 { 28.8} 34 { 32.} 326 { 33.3} 392 { 4.} 44 { 45.} 589 { 6.} 67 { 6.9} 74 { 72.9} 23 { 2.5} 4 { 4.4} 6 { 6.4} 27 { 22.2} 23 { 23.5} 256 { 26.} 284 { 29.} 38 { 3.4} 37 { 3.3} 359 { 36.6} 396 { 4.4} 499 { 5.9} 487 { 49.7} 586 { 59.8} 669 { 68.3} 729 { 74.4} 879 { 89.7} 924 { 94.3} NEF2 27 { 22.2} 23 { 23.5} 256 { 26.} 32 { 3.8} 344 { 35.} 363 { 37.} 49 { 42.7} 459 { 46.8} 566 { 57.7} 552 { 56.4} 652 { 66.5} 734 { 74.8 } 79 { 8.7 } 97 { 93.6 } 6 { 9 } 24 { 26 } 55 { 58 } * Values in for the NEF, 8, 25 indicate shaft bore diameters in stock. For these sizes, use double Power-Locks. * For NEF, 8, 25, use the square hub. For other sizes, use the extended-diameter hub.
TRANSMISSION CAPACITY / DIMENSIONS NEH Series: Large-Size Spacer Type Couplings NEH Series large-size Spacer Type couplings can be used for applications up to764 N m {8 kgf m}. Type B F 6 bolts EMER-FLEX No Disk bore diameter (Note) Hub Reamer bolt Overload washer Disk set U-nut Spacer Type C 8 bolts F Ni No Disk bore diameter (Note) Hub Reamer bolt Overload washer Disk set U-nut Spacer Note: The disk set is comprised of a disk, bush and collar. (See p. 5) Unit: mm Type (Number of Bolts) Allowable Torque Nm{kfm} Max. Rotation Speed r/min Rough Bore d Max. Shaft Dia. Keyed Bore Torsional Stiffness Nm/rad{kfm/rad} Axial Spring Constant N/mm{kf/mm} NEH 9W B (6) 882{ 9} 5 7 5.9 5 { 5.3 5 } 627{ 64} NEH 4W C (8) 37{ 4} 47 7 84.3 5 { 8.6 5 } 38{4} NEH 2W C (8) 96{ 2} 43 75 33 2.7 6 {.3 6 } 37{4} NEH 3W C (8) 294{ 3} 39 75 52 2.6 6 { 2. 6 } 7{83} NEH 4W C (8) 42{ 4} 37 2 65 25.5 6 { 2.6 6 } 88{92} NEH 55W C (8) 539{ 55} 36 3 87 35.3 6 { 3.6 6 } 287{23} NEH 7W C (8) 686{ 7} 34 5 25 44.7 6 { 4.6 6 } 92{96} NEH 9W C (8) 882{ 9} 3 5 23 58.2 6 { 5.9 6 } 278{22} NEHW C (8) 78{} 29 9 254 73.8 6 { 7.5 6 } 238{28} NEH35W C (8) 323{35} 27 9 263 94.6 6 { 9.7 6 } 2254{23} NEH5W C (8) 47{5} 25 2 275. 7 {.2 6 } 245{25} NEH8W C (8) 764{8} 24 2 289 2.2 9 {2.4 6 } 2666{272} Notes PCD A B E F H J K DD Ni NO Angular Misalignment de. All sizes are custom-made. 2. The maximum rotation speed depends on the transmission capacity of the coupling. No balance adjustment has been conducted. Contact us to adjust the balance for couplings at a high rotation speed. 3. The weight, moment of inertia and GD 2 are the values at maximum bore diameter (keyway). 4. Spacer lengths other than the standard length can be also manufactured. For details on the long spacer type, see p. 7. 5. The allowable axial displacement is based on the assumption that the angular misalignment is. 6. Check the key surface pressure in accordance with your operating conditions (see p. 8). The hub material is S45C. Allowable Misalignment Parallel Misalignment Axial Displacement Weight k Moment of Inertia k cm 2 GD 2 {kf cm 2 } NEH 9W 25 375 9. 8 6 55 276 44 38 56.4. 3.2 55 5 { 2} NEH 4W 25 49 27 9. 2 6 55 276 55 32 56. 2. 6 55 { 22} NEH 2W 247 463 46 9. 23 93 7 38 78 6 86.3 2.4 85 3 { 4} NEH 3W 279 57 65 2.5 25.5 28 87 346 2 8 2.4 2.8 25 85 { 74} NEH 4W 34 566 7 24. 28 24 224 375 28 98 23.7 2.8 72 293 { 7} NEH 55W 355 72 225 29.5 35 272 27 445 252 228 26 2. 3.6 293 648 { 259} NEH 7W 38 768 247 3.3 35 297 274 47 275 249 285 2. 3.8 344 98 { 363} NEH 9W 49 843 278 32. 39 334 287 5 34 28 32 2.2 4.3 456 44 { 574} NEHW 457 92 35 32.5 42 364 292 556 343 296 34 2.2 4.8 575 25 { 859} NEH35W 482 945 37 34. 47 382 3 587 35 32 36 2.4 5. 696 29 {59} NEH5W 58 5 33 34.5 49 399 343 629 368 325 375 2.6 5.6 826 39 {559} NEH8W 533 5 347 35.5 53 49 356 654 38 34 39 2.8 5.7 954 56 {223} 32
TRANSMISSION CAPACITY / DIMENSIONS Single-Side Adaptor Hub Type (A-Hub Type) / Unit Spacer Type (U-Type) Couplings The NEH Series Adaptor Hub Type coupling provides a larger bore diameter than the standard hub. With the Unit Spacer Type, the spacer unit can be mounted or removed without the need to disassemble the disk connecting section. A-Hub Type U-Type Adaptor hub E E S J S B N B A Allowable Torque Nm {kfm} Max. Rotation Speed r/min Standard Hub Rough Bore Max. Shaft Dia. Rough Bore D Adaptor Hub Max. Shaft Dia. D Torsional Stiffness Nm/rad {kfm/rad} Axial Spring Constant N/mm {kf/mm} Unit: mm A A B B E H H NEH9W(U) 882 { 9} 5 7 5 58 5.9 6 {5.3 5 } 627 { 64} 435 535 52 9 6 228 NEH4W(U) 37 {4} 47 7 55 58 8.43 6 {8.6 5 } 38 {4} 452 53 27 5 9 6 228 NEH2W(U) 96 {2} 43 75 33 65 82.27 7 {.3 6 } 37 {4} 49 565 46 5 9 93 264 NEH3W(U) 294 {3} 39 75 52 75 26 2.6 7 {2. 6 } 79 {83} 577.5 68 65 2 2.5 28 3 NEH4W(U) 42 {4} 37 2 65 8 224 2.55 7 {2.6 6 } 88 {92} 653 79 7 23 24 24 324 J K K K2 N N S S Angular Misalignment de Allowable Misalignment Parallel Misalignment Axial Displacement Weight k Moment of Inertia km 2 GD2 {kfm 2 } A U A U A U NEH9W(U) 55 276 297 33 73 23 8 38.4. 3.2 8 8.85.2 { 3.4} { 4.8} NEH4W(U) 55 276 297 33 75 23 2 38. 2. 88 5.93.3 { 3.7} { 5.2} NEH2W(U) 7 38 334 344 94 263 23 46.3 2.4 2 55.68 2.33 { 6.7} { 9.3} NEH3W(U) 87 346 374 384 22.5 28 25.5 46.5.4 2.8 77 23 3.5 4.23 {2.2} {6.9} NEH4W(U) 224 375 422 438 252 33 28 53.7 2.8 248 325 5.5 7.2 {2.2} {28.8} Notes. All sizes are custom-made. 2. When placing an order, contact for drawings. Reference Number System (Example) NEH4W - NJ X A2J Type W: Spacer Type U: Unit Spacer Type Type of Hub N: Standard Hub A: Adaptor Hub Bore Diameter (Rough bore: R) Shaft Coupling Method J: Keyway of new JIS normal type E: Keyway of old JIS Type 2 *: Indicate the smaller bore diameter first. *2: Indicate the rough bore (symbol R ) first. *3: Unit Spacer Type (U-type) couplings cannot be combined with the adaptor hub (A-hub) type. 33
TRANSMISSION CAPACITY / DIMENSIONS NEF Series: Gear Coupling (G-Type) Compatible Couplings Through a reduction in the hub face distances (dimension D ), the NEF-G Series G-Type coupling provides the same overall length and hub length as standard gear couplings. This makes the G-Type completely interchangeable with the standard gear couplings. Also, because there is no lubrication or man-hour costs involved, G-type couplings are ideal for TPM. G-Type EMER-FLEX Hub G Spacer flange Reamer bolt A Washer Disk U-nut A Reamer bolt B U-nut B Unit: mm Allowable Torque Nm {kfm} Max. Rotation Speed r/min Max. Shaft Dia. D A B H J K JIS Model Equivalent Gear Coupling Max. Shaft Dia. Torque Nm {kfm} Notes NEF 45G 44 { 45} 5 32 88 4 47 8 6 25 96 { 2} NEF 8G 784 { 8} 5 4 98 45 57 8 84 2 32 392 { 4} NEF3G 27 { 3} 5 48 8 5 69 8 27 25 4 784 { 8} NEF2G 26 { 2} 5 55 34 63 8 8 245 4 5 23 { 25} NEF34G 333 { 34} 5 65 7 8 93 264 6 63 76 { 8} NEF54G 529 { 54} 34 75 9 9 6 36 8 7 245 { 25} NEF7G 686 { 7} 3 8 2 6 342 2 8 348 { 355} NEH 9G 882 { 9} 35 95 236 2 4 2 334 224 9 49 { 5} NEH 4G 37 {4} 35 5 262 25 47 2 334 25 696 { 7} NEH 2G 96 {2} 3 2 294 4 7 4 378 28 25 {2} NEH 3G 294 {3} 28 36 334 6 97 4 46 35 4 57 {6} NEH 4G 42 {4} 25 49 376 8 23 6 462 355 6 245 {25}. All sizes are custom-made. 2. When placing an order, contact for drawings. (With the NEF45G/8G/3G/2G/54G/7G, the reamer bolts protrude from the hub end faces.) Reference Number System (Example) NEF45G - GR X G3J G-Type Type of Hub G: Hub for G-Type Bore Diameter (Rough bore: R) Shaft Coupling Method J: Keyway of new JIS normal type E: Keyway of old JIS Type 2 34
NEW PRODUCTS 35
OTHER TYPES OF COUPLINGS Environmentally Resistant (Electroless Nickel-Plated / Stainless Steel Type) The disk on these couplings is made of stainless steel. Other parts, however, can be plated with electroless nickel, or made of stainless steel, for rustproof application, as required. Contact for drawings. Various Power-Lock Types The EL Series Power-Lock and pressure flange come standard as part of the Power-Lock specifications. Power-Locks are available for other types of couplings also. EMER-FLEX The SL Series Power-Lock enables clamping from outside of the hub. The AS Series Power-Lock can reduce the axial dimension. The TF Series Power-Lock can connect larger shaft diameters. In addition to the above, other types of Power-Locks are also available. Contact for drawings. Single-Hub Insertion Type / Dual-Hub Insertion Type Spacer Type couplings are suitable for applications where a shorter overall coupling length is desired. Single-Hub Insertion Type With one hub mounted inside, the axial dimension can be reduced. Dual-Hub Insertion Type With both hubs mounted inside, the axial dimension can be reduced even further. Long Spacer High-Speed Type When using a Long Spacer Type coupling at high rotation speeds, it is usually necessary to consider the critical rotation speed in order to avoid a resonance point. (See p. 9) To avoid the critical rotation speed range, a larger size coupling may be selected. However, if the selection of a larger size is not an option, couplings with an increased spacer weight can be manufactured as shown below. 36
INSTALLATION Centering Adjustment Single and Spacer Type Couplings The more accurate the initial centering of the coupling, the less stress it will experience during operation. Wear of the shaft bearing, depressions in the mounting surface, changes in conditions affected by temperature and vibration can reduce the life of the coupling and your equipment. Center accurately and conduct periodic adjustment according to the following procedure. Angular misalignment misalignment Hub face distance J Single Type Spacer Type L: Disk center distance Single Type Spacer Type misalignment L: Disk center distance = J- E Note: The single type coupling cannot absorb parallel misalignment (parallel misalignment of the shaft center). The allowable angular misalignment, parallel misalignment and hub face distance misalignment all act in correlation to each other. When one increases, the others decrease. These factors must, therefore, be considered together. Perform the initial centering adjustment carefully so that the following recommended value is not exceeded. Table Recommended Centering Value (Single Type Coupling) Single Type Angular Misalignment Dial Reading de T.I.R.mm NEF 2.25.25 NEF 4.25.29 NEF.25.35 NEF 8.25.4 NEF 25.25.45 NEF 45.25.55 NEF 8.25.62 NEF 3.25.73 NEF 2.25.84 NEF 34.25.93 NEF 54.25.7 NEF 7.25.2 Parallel Misalignment mm Errors cannot be absorbed. * Hub Face Distance Misalignment Emm 4.9.25 6..25 6.6.25 8.3.25.2.25.7.25.7.25 6.8.25 7..25 2.6.25 23.9.25 27.2.25 * The Single Type Coupling cannot absorb parallel misalignment, so the parallel misalignment should be set to within.2 mm during centering adjustment. Recommended Centering Value (Spacer Type Coupling) Spacer Type Angular Misalignment Parallel Hub Face Dial Reading Misalignment Distance Misalignment de T.I.R.mm mm Emm NEF 2 W.5.5.75 4.9.25 NEF 4 W.5.58.3 6..25 NEF W.5.7.4 6.6.25 NEF 8 W.5.8.7 8.3.25 NEF 25 W.5.9.8.2.25 NEF 45 W.5..22.7.25 NEF 8 W.5.25.25.7.25 NEF 3 W.5.46.27 6.8.25 NEF 2 W.5.69.3 7..25 NEF 34 W.5.86.33 2.6.25 NEF 54 W.5 2.4.37 23.9.25 NEF 7 W.5 2.4.46 27.2.25 NEH 9 W.35.68.3 9..25 NEH 4 W.25.2.3 9..25 NEH 2 W.25.34.33 9..25 NEH 3 W.25.5.36 2.5.25 NEH 4 W.25.64.43 24..25 NEH 55 W.25.94.5 29.5.25 NEH 7 W.25 2.5.5 3.3.25 NEH 9 W.25 2.23.55 32..25 NEH W.25 2.43.55 32.5.25 NEH35 W.25 2.56.6 34..25 NEH5 W.25 2.74.65 34.5.25 NEH8 W.25 2.85.7 35.5.25 Long Spacer Type Allowable parallel misalignment L: Disk center distance = J - E E: Hub face distance J: Flange face distance Flange-to-flange dimensions Table 2 Recommended Centering Value (Long Spacer Types) Angular Misalignment Parallel Hub Face Distance de Dial Reading T.I.R.mm Misalignment mm Misalignment Emm NEF 4 W.5.58 L.43-2 6..25 NEF W.5.7 L.43-2 6.6.25 NEF 8 W.5.8 L.43-2 8.3.25 NEF 25 W.5.9 L.43-2.2.25 NEF 45 W.5. L.43-2.7.25 NEF 8 W.5.25 L.43-2.7.25 NEF 3 W.5.46 L.43-2 6.8.25 NEF 2 W.5.69 L.43-2 7..25 NEF 34 W.5.86 L.43-2 2.6.25 NEF 54 W.5 2.4 L.43-2 23.9.25 NEF 7 W.5 2.4 L.43-2 27.2.25 NEH 9 W.35.68 L.3-2 9..25 NEH 4 W.25.2 L.22-2 9..25 NEH 2 W.25.34 L.22-2 9..25 NEH 3 W.25.5 L.22-2 2.5.25 NEH 4 W.25.64 L.22-2 24..25 NEH 55 W.25.94 L.22-2 29.5.25 NEH 7 W.25 2.5 L.22-2 3.3.25 NEH 9 W.25 2.23 L.22-2 32..25 NEH W.25 2.43 L.22-2 32.5.25 NEH 35 W.25 2.56 L.22-2 34..25 NEH 5 W.25 2.74 L.22-2 34.5.25 NEH 8 W.25 2.85 L.22-2 35.5.25 37
Gear Coupling Compatible Type Adjusting the hub-to-hub dimension E E EMER-FLEX Hub G Face Distance For both the Spacer Type and Single Type couplings, measure dimension E at four places (at 9angles), and adjust the hub position so that the average value of dimension E is within ±.25 mm. When a stepped shaft is used for both the drive and driven shafts, the margin for adjustment may be limited. In this case, give consideration in advance so that dimension E can be adjusted. Adjusting the angular misalignment () Parallel Misalignment Angular Misalignment Table 3 Recommended Centering Value (Gear Coupling Compatible Type) Angular Misalignment Parallel Hub Face Dial Reading Misalignment Distance Misalignment de T.I.R.mm mm Emm NEF45G.5.5.2 6.4.5 NEF8G.5.2.23 68.4.5 NEF3G.5.45.25 78.6.5 NEF2G.5.65.3 88..5 NEF34G.5.85.3 97.2.5 NEF54G.5 2.5.38 2.8.5 NEF7G.5 2.4.45 36.4.5 NEH9G.35.68.25 9..5 NEH4G.25.2.8 7..5 NEH2G.25.35.2 2.6.5 NEH3G.25.5.23 28..5 NEH4G.25.63.25 43..5 a) With a dial gauge fixed to one of the hubs as shown above, rotate the hub to find the minimum indication on the dial gauge, and set that to. b) Rotate the hub with the dial gauge 36, and read the value for the angular misalignment. c) Move the equipment with a shim until the reading on the dial gauge is within the recommended angular misalignment range specified in Table. Adjusting the parallel misalignment (mm) Relationship between Parallel Misalignment and Angular Misalignment for the Spacer Type Coupling Parallel Misalignment (Eccentricity per Unit Length of Disk Center Distance (L)) Parallel Misalignment (Eccentricity per unit Length of Disk Center Distance (L)) NEH4W-8W NEF2W-NEF7W NEH9W NEH4W -8W NEH9W Allowable Centering Value NEF2W- NEF7W Allowable Angular Misalignment Allowable Angular Misalignment Recommended Centering Value a) With a dial gauge fixed to the hub flange as shown above, rotate the hub to find the minimum indication on the dial gauge, and set that to. b) Rotate the hub with the dial gauge 36, and read the value for the parallel misalignment. c) The reading on the dial gauge around the periphery of the hub flange may fluctuate markedly at the hub s drilled bore. This is because the flange is displaced toward the periphery while machining the drilled bore. When reading the dial gauge, disregard the values at such locations. d) Move the equipment with a shim until the reading on the dial gauge is within twice the recommended parallel misalignment range specified in Table. e) If the equipment is moved for the purpose of parallel misalignment adjustment, perform the angular misalignment adjustment procedure once again. Repeat the above adjustment procedures until all of the coupling s displacement values are acceptable. Tighten all U-nuts with the torque specified in Table 4 (p. 39). EMER-FLEX couplings transmit torque via the friction force that is generated between the disk and washer through the U-nut tightening force. Be sure to follow the tightening torque specified in Table 4 (p. 39). 38
INSTALLATION. Reamer Bolt Tightening Torque EMER-FLEX couplings transmit torque via the friction force between the reamer bolt and the U-nut. Tighten the reamer bolts and U-nuts securely with the specified torque. However, NES Series couplings are delivered as a completed assembly; never loosen the hexagon socket head bolt that fastens the disk. Table 4 NEF Series (except G type) Gear Coupling Compatible Type NEF 2 Reamer Bolt Tightening Torque Nm {kfm} Reamer Bolt Size 4.9 {.5 } M 5 Reamer Bolt (A) Tightening Torque Nm {kfm} Size of Reamer Bolt (A) Reamer Bolt (B) Tightening Torque Nm {kfm} Size of Reamer Bolt (B) NEF 4 NEF NEF 8 NEF 25 NEF 45 NEF 8 NEF3 8.82 {.9 } M 6 8.82 {.9 } M 6 2.6 { 2.2 } M 8 2.6 { 2.2 } M 8 4.2 { 4.2 } M 78.4 { 8. } M2 78.4 { 8. } M2 NEF 45G 4.2 { 4.2 } M 8.82 {.9 } M 6 NEF 8G 78.4 { 8. } M2 2.6 { 2.2 } M8 NEF3G 78.4 { 8. } M2 2.6 { 2.2 } M 8 NEF2G 77 { 8. } M6 4.2 { 4.2 } M NEF34G 77 { 8. } M6 4.2 { 4.2 } M NEF54G 47 { 48. } M2 78.4 { 8. } M2 NEF2 77 { 8. } M6 NEF34 77 { 8. } M6 NEF54 47 { 48. } M2 NEF7 657 { 67. } M24 NEH 9 47 { 48. } M2 NEH 4 568 { 58. } M22 NEF7G NEH 9G NEH 4G NEH 2G NEH 3G 657 { 67. } M24 78.4 { 8. } M2 47 { 48. } M2 78.4 { 8. } M2 568 { 58. } M22 78.4 { 8. } M2 784 { 8. } M24 77 { 8. } M6 7 { 9. } M27 77 { 8. } M6 NEH 2 NEH 3 NEH 4 NEH 55 NEH 7 NEH 9 NEH NEH35 NEH5 NEH8 784 { 8. } M24 7 {9. } M27 59 {62. } M3 2254 {23 } M36 2548 {26 } M36 3234 {33 } M39 392 {4 } M42 49 {5 } M45 5488 {56 } M48 686 {7 } M52 NEH 4G 59 { 62. } M3 47 { 48. } M2 Reamer Bolt Face-to-Face Dimensions Unit: mm Size M5 M6 M8 M M2 M6 M2 M22 M24 M27 M3 S 8 3 7 9 24 3 32 36 4 46 2. Tightening the Reamer Bolt When tightening the reamer bolts, be careful not to apply an axial force to the coupling hub. If an axial force is applied to the hub, the disk may warp and become fixed in that warped state. Tighten the reamer bolts securely with the torque specified in the table above. Pressure Bolt Tightening Torque The pressure bolt tightening torque varies depending on the coupling model number and the Power-Lock size (shaft diameter). Tighten the pressure bolt with the proper torque listed in the Combinations with Power- Lock table on p. 3. The U-nut is made of metal. It can be mounted and dismounted up to 2 times. If you will need to mount and dismount the U-nut more than 2 times, keep a spare U-nut on hand. Pressure Flange Anti-Rotation Bar 3. Anti-Rotation Hole With the Power-Lock type coupling, anti-rotation holes are provided in the pressure flange, allowing the pressure bolt and reamer bolt to be easily tightened. The bolts can be easily mounted using an anti-rotation bar. 4. Removing the Coupling The Spacer Type coupling can be removed from the shaft without running the drive or driven equipment. This feature considerably simplifies centering adjustment when re-mounting the coupling. <Removal Procedure>. Loosen all reamer bolts and remove the disks and spacers. (Fig. ) 2. Loosen the set bolt that fastens the hub, and then slide the hub off to remove it. (Fig. 2) 3. To re-mount the coupling, perform the above steps in reverse order. After both hubs are mounted to the shaft, it is recommended that you check the centering level to verify the mounting state. Fig. Fig. 2 Hub 5. Inspection After operating the equipment for one or two hours, check the angular misalignment and the parallel misalignment once again. At this time, re-tighten the bolts and nuts with the torque specified in the table above. Once the equipment has been in operation for 6 months or one year, check the U-nuts for looseness. It is recommended that you mark the reamer bolts and U-nuts at the time of installation so that you can check for looseness later on. Be sure to check for any abnormalities in other components as well. 39
Installing NES Series couplings. Installing the Coupling Read the instruction manual carefully to understand the proper method of handling couplings. Since NES Series EMER-FLEX couplings are delivered as a completed assembly (finished bore), the coupling can be directly mounted to your equipment. Mount the coupling to the shaft according to the following procedure. When mounting the coupling, be careful not to apply excess force to the coupling, and be sure not to drop the coupling. Never loosen the hexagon socket head bolt that fastens the disk. EMER-FLEX 2. Mounting the Coupling to a Shaft Use a cloth to wipe any dust and oil completely off the surface of the target shaft and the coupling mounting surface. Perform the shaft centering adjustment procedure and mount the coupling to the shaft. The allowable angular misalignment, allowable parallel misalignment and allowable axial displacement all act in correlation to each other. When one increases, the others decrease. These factors must, therefore, be considered together. Perform the centering adjustment while referring to the following instructions. <When Using the Spacer Type> Convert the parallel misalignment into an angular misalignment (Graph ). Angular Misalignment (Graph ) Spacer Type.4 NES5W,NES7W NES3W.8 NESW NES2W NES25W.2 NES5W NES8W.5 NES3W NES7W 2..2.4.6 Parallel misalignmentmm Angular misalignment Parallel misalignment Axial displacement Apply the total of the converted value and angular misalignment to the angular misalignment shown in Graph 2. Adjust the centering condition so that the misalignment does not exceed the range specified for each size. 2. (Graph 2) Spacer Type. (Graph 3) Single Type Angular Misalignment NES3W.6.2.8 NES2W NES5W.4 NES7W NES5W NES7W NESW NES25W NES8W NES3W Angular Misalignment NES3.8.6.4 NES2 NES5.2 NES7 NES5S NES7S NESS NES25S NES8S NES3S.4.8.2.6 2..2.4.6.8. Axial Displacementmm Axial Displacementmm <When Using the Single Type> The capacity of the Single Type Coupling to absorb a parallel misalignment is extremely small. Therefore, the centering adjustment should be conducted mainly to correct any angular misalignment and axial displacement. Graph 3 shows the correlation between the coupling s allowable angular misalignment and allowable axial displacement. Adjust the centering condition so that the misalignment does not exceed the range specified for each size. Make sure that the mounted coupling can be moved in the rotating and axial directions with only a light force when the clamp bolt is loosened. If the coupling cannot be moved smoothly, re-adjust the centering condition in Step. Tighten the clamp bolt with the torque specified in Table 5. Then, insert the shaft all the way until it reaches the clamp hub end face. Table 5 Clamp Bolt Size Tightening TorqueNm {kfm} NES7 NES5 NES2 NES3 NES5 NES7 NES NES25 NES8 NES3 M2 M2 M2.5 M2.5 M3 M3 M4 M4 M6 M6.5 {.4}.5 {.4}. {.}. {.}.9 {.9}.9 {.9} 3.8 {.39} 3.8 {.39} 2 {.22} 2 {.22} 4
BORE SPECIFICATIONS Spacer Type NEF Series Spacer TypeStandard HubStandard Hub Single Type Single TypeStandard HubStandard Hub Spacer TypeExtended-Dia. HubExtended-Dia. Hub Single TypeExtended-Dia. HubExtended-Dia. Hub Spacer TypeExtended-Dia. HubStandard Hub Single TypeExtended-Dia. HubStandard Hub Long Spacer Type (Standard Length) Long Spacer Type NEH Series Spacer Type Single Plate Spacer Type [General Matching of the Keyway Angles] When machining shaft bores at Tsubaki, the angle of the keyway in the right and left hubs may be misaligned as shown above. Hub keyway angles generally match: NEH Series, NEF Long Spacer Type Hub keyway angles do not match: NEF Single Type, NEF Spacer Type, NEF Long Spacer Type (standard length), NEF Single Plate Spacer Type When accurate matching of the keyway angles is required, please specify the Òmatching keyway angle typeó when placing your order. With the matching keyway angle type, the maximum angle difference is ±2. When higher accuracy is required in matching keyway angles, the Power-Lock Type is recommended. 4