NCK/SCK/FCK Related products Shock absorber NCK/ SCK/FCK

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1 ethod ixed type Adjustable type odel no. N S Low speed type edium speed type High speed type CONTENTS Safety precautions /fixed type (N) 7 /adjustable type (S) 9 /adjustable type () 7 ax. colliding speed working range m/s to 3.0 to.0 to to to 3 : Standard, : Option, : Custom order, : Not available ax. energy absorption () ounting style Basic type lange With stop nut Option Capped 00 A N C Deflection angle adaptor Page H0 BSA G H HB HD H LB

2 H0 BSA G H HB HD H LB Pneumatic components Safety precautions Always read this section before starting use. efer to Intro 9 for general details on the cylinders, and to 7 for cylinder switches. series. COON WANING Use within the product specification range. If maximum energy absorption in specifications is exceeded, damage or operation faults may occur. Performance in specifications may not be attained if not used at the full stroke length. CAUTION Check that the product withstands the working environment before use. Use in conditions exceeding the ambient temperature range will cause durability to drop. Do not use in an environment (vacuum, high pressure) other than atmospheric pressure. Check for scatter caused by cap damage. If used with exceeding specifications, the cap may be damaged and cause injuries by scatter. Provide a scatterprevention cover, or move to a safe position while the main machine is operating. Do not use this product in cleanrooms. Otherwise, cleanrooms may be contaminated. Check collision conditions. Before starting use, obtain collision speed, collision object weight, thrust applied to the shock absorber and the number of collisions per minute. () This is also necessary for calculating selection. If collision speed is less than the specification range, resistance is not generated and only a small amount of energy is absorbed, preventing the shock absorber from having any effect. () This product may not be used if the number of collisions per minute exceeds the maximum repetition cycle. Design & Selection Check that the surface of the collision object contacted by the piston rod is hard enough. When the cap is not used, a high surface compression load is applied to the surface of the collision object contacted by the piston rod. The contact surface must be C3 and over. Check for the collision object's return force. When using this product for conveyor drives, etc., it may be pressed back by internal spring force after energy is absorbed. efer to the return spring force section in specifications for details. Do not use more than one shock absorber in parallel due to difficulty in balancing them. Use one shock absorber having a large absorption energy. Use an external stopper or the optional stopper nut at the final stop position of the collision object so impact is not applied to the main device. If impact is applied to the main device, durability may drop and return failures occur. Check that the product withstands the working environment before use. The maximum repetition cycle differs with ambient temperature. alues given in specification descriptions are for room temperature (0 C). Note that these values may change with the working temperature.

3 Series. Common DANGE Do not use this product near fire or in devices or machines having an ambient temperature exceeding specifications. lammable oil in the product poses the risk of fire. Do not place in fire. Since oil is sealed, this product may explode or ignite if placed in fire. WANING Do not apply an eccentric load exceeding A from the piston rod centerline. If load collides at a deflection angle exceeding A, the piston rod may bend and cause a return failure or a drop in performance caused by offset wear of the sliding section. When using at a deflection angle exceeding A, use the optional deflection angle adapter. This may be used up to. ( Series) Within S A. When using rotary motion collision, set the distance from the center of the collision object's rotation to the shock absorber installation position at fold and over of the shock absorber stroke (3fold and over when using a deflection angle adapter). Install so contact is at a right angle at a position half of the stroke. fold and over of stroke 90 Installation & Adjustment / of stroke Do not use with insufficient installation section strength. The main machine may be damaged and injuries result if installation section strength is insufficient. Secure the maximum load safety factor for installation section strength. (efer to the max. load, or consult with D.) Do not remove the cap from the shock absorber. The piston rod is extended so the cap may be installed. Use without the cap may damage the base. emove Stroke length Extension Cylinder A guide is required if the collision object vibrates. Install a secure guide on the collision object if the collision object vibrates or if force is applied to the piston rod at an axial right angle direction. isk of static electricity buildup in explosionproof environment. Use a grounding device for discharge, and do not use cushioning materials that generate sparks. Do not place in fire. Oil is sealed, so the product may explode or ignite if placed in fire. ollow specified waste oil treatment to dispose of this product. Do not apply another external load by stroke end colliding object stops. Applying a separate external load to a collision object stopped at the stroke end may result in damage. Turn device power off and confirm the machine is stopped before installing, removing, or adjusting the stroke. H0 BSA G H HB HD H LB 3

4 Series H0 BSA G H HB HD H LB CAUTION Observe the following table for mounting nut tightening torque. The shock absorber may be damaged if nut tightening torque exceeds the upper limit below. If the nut is to be securely tightened, use adhesives, etc., to ensure nut tightness. (N Series) Thread (mm) Nut tightening torque (N m) (S Series). to.0 3 to to 7. to to 30 Thread (mm). 7. Nut tightening torque (N m) to 70 0 to 30 Thread (mm) 0. Nut tightening torque (N m) to. Thread (mm) Nut tightening torque (N m) ( Series) 9. to to to. Thread (mm).. 0. Nut tightening torque (N m).9 to 7..9 to 7..3 to 9.. to.7 9. to Thread (mm) Nut tightening torque (N m) 9.0 to.0.9 to to to to 90.0 If the rotating objects or if deformation or wear is generated between the shock absorber and the collision object, place protective material before the collision surface to prevent deformation and wear. Slip plate Do not damage the piston rod sliding section or the damper case thread O.D. section. Do not contact or sandwich objects between the piston rod sliding section or outer tube thread O. D. section, or fit setscrews, etc., into these causing damage or dents. Damage or dents on the position rod's sliding section may damage packing or cause oil leakage or operation faults. Damage or dents on the outer tube thread O. D. section may prevent proper installation on the platform, causing operation faults due to deformation of internal components. Do not use in conditions where oil mist or water drops may contact the rod surface, or in areas with high levels of wear powder. Energy is not absorbed properly and faults may occur. Do not use without the external stopper. Operation without the external stopper may damage the main body from bottom end. Install the external stopper at the specified position. N S L 0.mm to 3mm mm Do not use with outside specified tightening torque range. Installation with outside specified tightening torque range may damage the main body. Do not fix with screws that do not fit mounting holes. The product may drop off or be damaged. Check for snap ring looseness or loss. If using outside specifications, the internal pressure of the inner tube in the shock absorber may rise abnormally causing the snap ring to come off. This may cause inner parts to pop out and cause injury. Do not approach the shock absorber during operation. If the device is stored with the rod pressed in, the performance of the air chamber may drop. Do not store pressed in. Adjust the adjustable type, and use at the optimum position. Do not damage a piston or tube outer diameter thread. Damaged sealing section may cause durability drop and return failure.. Adjustment method of series CAUTION Workpiece To adjust the shock absorber, first set the adjusting dial to "", collide, then while observing the state, rotate in the direction of "" or "3" to the optimum position. After setting the scale to the optimum position, tighten the lock screw before starting use. If the lock screw is not tightened, the adjusted position may deviate and optimum absorption may not be attained. Note that the L0., H 0., L0.3 and H0. are without lock screws. Protect the shock absorber with an external stopper or stopper nut during adjustment. * 3 on the adjusting dial refers to the absorbed energy, weak medium strong. There may be a slight variation in products. Adjust individual products to the optimum position. L External stopper

5 7 Series 3. Adjustment method of S series CAUTION The S**0.3 and larger products are provided with an adjuster. Adjust as follows: If collision force cannot be absorbed, turn the adjuster toward large values. The adjuster is nonrotating and locks the position with a detent. Check that collision force is applied when the detent is activated. Note : aximum energy absorption is attained when the adjuster is turned clockwise to 9, and minimum energy absorption is attained when the adjuster is turned counterclockwise by one rotation and slightly more. inimum energy may vary per product. Turning the adjuster forcibly may lock or damage it. Note : Operation time may increase or operation may stop midway if the adjuster is not set appropriately. 9. Common 0 in. energy absorption WANING Adjuster ax. energy absorption (Scale: 9) Turn one rotation and slightly more. Do not disassemble. Attempts to disassemble the product may pose the risk of danger. CAUTION Improper disposal of oil is prohibited. Improper disposal of oil sealed in the shock absorber causes environmental contamination. ollow specified waste oil treatment to dispose of this product. During Use & aintenance H0 BSA G H HB HD H LB Check for to abnormal vibration sounds and vibration. If collision or vibration increases abnormally, product life may be expired. eplace the product. Continuing using is may damage equipment.

6 H0 BSA G H HB HD H LB Specifications Descriptions Series Type/classification ax. energy absorption Stroke length ax. energy absorption per hour ax. colliding speed ax. repeating cycle Ambient temperature ax. load (resistance) eturn time Product weight ecoiling force mm k/hour m/s Cycle/min. C N S kg N N Extended Compressed N Series 3.0. aximum energy absorption: to N.. Without adjuster Spring return type to or less 0. or less 0. or less

7 How to order N N Note on model no. selection Note : 3 hexagon nuts are provided for N specifications products. <Example of model number> N000.7N odel: A ounting style: Basic type B Series: AX energy7 C Option: With stop nut A ounting style How to order accessories lange bracket ( pc.) N 0.7 A Stop nut + hexagon nut (each pc.) N 0.7 N Hexagon nut ( pc.) N 0.7 NT B Series C Symbol Option Note Series (AX energy value) Symbol Descriptions A ounting style 00 Basic type A lange type B Series (AX. energy value) C Blank N C Option Standard With stop nut Capped N Series How to order H0 BSA G H HB HD H LB 9

8 N Series H0 BSA G H HB HD H LB Operational explanation () Collision If the workpiece collides with the piston rod, oil in the tube pressed by the piston is pressurized, passes through grooves on D's original slit orifice, and flows toward the oil room with the air chamber. The piston is further pressed in by cylinder thrust or workpiece weight, etc., but the area of the slit orifice gradually decreases, so even higher resistance is generated. This series of operation is done continuously to stop the workpiece smoothly. Piston rod Structural explanation () eturn When released from the workpiece, the piston returned with the integrated spring, moving from the seal to the valve stopper, so the oil return flow path is opened by the cutoff section on the piston. Oil passes through this flow path and the slit orifice and returns to the state before the workpiece collided. The system waits for the next workpiece collision in this state. Slit orifice alve alve stopper Collision eturn Air chamber Clearance Seal surface A B C Piston cutoff Piston Section A Section B Section C. The silt orifice smoothly changes (decreases) as the piston moves as shown above. This structure enables an ideal "stop" when used with a hydraulic damper, but as manufacturing is difficult, it has not been integrated in other brands. D has implemented linear stopping performance as shown in ig.. ig. esistance [N]/acceleration [m/s ] esistance [N]/acceleration [m/s ] ig. N007.0 esistance generated with N Acceleration generated when stopping workpiece G stroke (mm) Characteristic wave form of slit orifice integrated with N Series Acceleration generated when stopping workpiece G Generated effect stroke (mm) Characteristic waveform attained with conventional multiple orifice : Indicates point where workpiece contacts end of shock absorber. (N) esistance Stroke length (mm). Generally, the dual tube shown above is used for the orifice area changes with piston movement. ultiple small orifice holes in the inner pipe are closed as the piston moves, greatly affecting performance via hole positioning precision, and resistance changes with each orifice as shown in ig., preventing smooth operation. esistance is the max. esistance is gradually generated stroke Energy in workpiece esistance of shock absorber

9 Internal structure and parts list Parts list No Basic type (without cap) Capped Parts name aterial emarks od Steel Oil seal Special nitrile rubber od guide Copper alloy Air chamber Nitrile rubber alve Steel Piston Cast iron Hexagon nut Steel alve stopper Steel E type snap ring Steel for spring N** 0.7C N** C. 0. Industrial chrome plated Galvanizing Galvanizing No. 3 7 Parts name aterial emarks Spring Piano wire Damper case Steel Label Polyester film Ball Alloy steel Damper cushion Polyamide resin Damper cushion Polyester resin Cushion stopper Steel Hexagon socket head set screw Steel N Series Internal structure and parts list Chrome plating Black Black Galvanizing H0 BSA G H HB HD H LB

10 H0 BSA G H HB HD H LB Dimensions Symbol odel no. N000. N000.3 N000.7 N00. N00. N007 N00 N000 A A' B C E G H I K L LL ' N Basic type (00) Standard (N****) Capped (N****C) K I LL H L E A' C G B N (screw section) ' LL L H K A C N (screw section) B G N Series

11 N Series Dimensions Dimensions: Option (flange (mounting bracket)) 0. N** lange (A) Stop nut (N) H0 Q P. N** 7 0 lange (A) T Y Stop nut (N) W X U ' L LL BSA G H HB S W X LL T HD Symbol odel no. N000. N000.3 N000.7 N00. N00. N007 N00 N000 lange (A) P Q S T Stop nut (N) ' U W X Y H LB Q P Q P Y U ' L 3

12 selection guide () H0 BSA G H HB HD H LB ake collision pattern of device clear a. Simple horizontal colliding b. Colliding with thrust of cylinder c. Colliding with drive force of motor g. Colliding caused by free slide h. Colliding with thrust of cylinder (down) i. Colliding with thrust of cylinder (up) d. Colliding caused by free drop j. Colliding caused by free oscillating drop e. Colliding with thrust of cylinder (down) k. Colliding with torque of motor, etc. (oscillation) f. Colliding with thrust of cylinder (up) l. Colliding with torque of motor, etc. (rotation) Note: efer to "Example of colliding pattern". ake required conditions / descriptions clear to calculate energy E = all absorbed energy () E = kinetic energy () E = thrust/selfweight energy () = colliding weight (kg) = colliding speed (m/s) S = N stroke length (m) = pressure (N) H = drop height (m) T = torque (N m) Td = motor start torque (N m) K = reduction ratio g = acceleration of gravity 9.m/s,, = angle (deg) L = colliding object moving distance (m) = angular speed (rad/s) (Slope free drop) = moment of inertia (kg/m ) = distance from center of rotation to colliding point (m) D = diameter (m) r = distance from center of rotation to center of gravity (m) N = number of rotation (rpm) G = position of center of gravity e = colliding object equivalent weight (kg) Horizontal motion ertical motion Example of colliding pattern Applications Kinetic energy E () Thrust/selfweight energy E () All absorbed energy E () Colliding object equivalent weight e (kg) Applications Horizontal colliding Slope motion Oscillation motion otation ertical colliding a. Simple horizontal colliding b. Pressure of cylinder applies c. Pressure of motor applies d. ree drop e. Cylinder lower limit stopper f. Cylinder upper limit stopper E = E e = CYL S E = E + E D Td K Td S D E = E + E g S E = E + E ( g + ) S E = E + E ( g) S E = E + E E E E E E e = e = e = ( = g H) e = e = Slope colliding Oscillation colliding otation colliding g. ree drop h. Pressure of cylinder applies i. Pressure of cylinder applies j. ree drop k. Torque of motor, etc. applies L. Torque of motor, etc. applies CYL CYL H H G r r CYL T T D CYL Kinetic energy E () Thrust/selfweight energy E () All absorbed energy E () Colliding object equivalent weight e (kg) g S sin E = E + E ( g sin +) S E = E + E ( g sin +) S E = E + E D = T S E = E + E E 3 g H e = ( = g L sin ) e = E E E E N e = e = ( = ) ( g sin +) S e = ( =, = ) r 0 g H r g S E = E + E or T S E = E + E

13 3 Check shock absorber specifications range a. ax. repeating cycle b. ax. colliding speed (cycle/min.) (m/s) c. Ambient temperature d. eturn time ( C) (s) Note: alue of allowable energy absorption may vary depending on colliding speed. efer to page 7 and graph. Calculate actual energy per "Example of colliding pattern". Explanation of symbol a. Kinetic energy : Calculate the E value according to "Example of colliding pattern". H0 b. Thrust, selfweight energy : Calculate value of E according to "Example of colliding E = all absorbed energy pattern". or S (stroke length of N) in expression, E = kinetic energy BSA select model whose maximum energy absorption E = thrust/selfweight energy exceeds E, and use S per model No. c. All absorbed energy : If result of calculation exceeds Emax (maximum energy absorption) after that, select one size larger N according to selected model No. before, and recalculate. If calculated E is G lower than Emax selected model No., the selection is acceptable. Confirmation on colliding object equivalent weight e = colliding object equivalent weight (kg) a. Calculate value of e according to "Example of colliding pattern". b. Permissible if e is within e range of selected model (calculated value of e < specified value H Note: Colliding object equivalent weight corresponds to weight of of e) according to calculation of e (catalog value) and "a" for model No. selected at (). HB workpiece, even for body moving with thrust etc., if it is assumed that all of them are kinetic energy only. If only expression of energy is used, c. When exceeding the range of selected e model at "b", select one size larger N, and check load is restricted by colliding object equivalent weight, because the weight of workpiece will extremely increase in low speed operations. conditions in same manner. Note) Colliding object equivalent weight (e) is listed on page 7 (graph ). Calculation flow chart of step and Calculate E HD Select model no. roughly Select one size larger model no. Substitute St of selected model No. for formula E Calculate E Calculate E = E + E H E < Emax. (Specified value) Yes Calculate E 'e < e (Calculated value) (Specified value) No No N Series Selection guide LB Yes End of selection

14 selection guide () H0 BSA G H HB HD H LB can be selected by calculation as () or reading graph. If not required to grasp energy values etc. during calculation, if this graph is used, proper model can be selected efficiently. Energy calculation graph Thrust applies at horizontal collision (Graph ) (Graph ) Colliding speed (m/s) 0.m/s 0.3m/s 0.m/s.0m/s.0m/s 3.m/s 0.9m/s 0.m/s 0.7m/s 0.m/s 0.m/s 3.0m/s.0m/s.m/s.0m/s a) Decide colliding weight (kg): () b) Colliding speed (m/s): () c) Point of intersection between and (3) is kinetic energy E (). : (3) d) Extend (3) to <Graph >, and refer to curve in figure to draw same curve. (dotted line): () e) Next, if thrust applies, decide thrust (N) (from inner diameter and pressure of cylinder) by right end chart of <Graph 3>: () f) Determine model no. of N according to stroke length and max. energy absorption. : () (Select model no. whose max. energy absorption exceeds E found at (3).) g) Point of intersection between and N model no. (7) shows thrust/ selfweight energy E (). : (7) h) Extend point (B) to <Graph >, and point of intersection () with curve () shows total energy E (= E + E) (). Here, if value E exceeds selected N Emax (max. energy absorption) at (f), select one size larger model no. of N again, the find E with same procedure. i) Here, if (C) and () are extended to <Graph >, point of intersection (9) with (m/s) shows colliding object equivalent weight e. : (9) Check that colliding object equivalent weight is to be within specified value range <Graph >. (When e is exceeding specifications values, return to (f), and repeats same procedures.) (Graph 3) Condition of this figure: Horizontal colliding wit thrust m = kg, =.0m/s Cylinder bore size Supply pressure = 0.Pa Colliding weight (kg) Thrust/selfweight energy (/g) E () Kinetic energy E () 0. N0 N N7 N. N. N0.7 N0.3 N Total energy E () 0.Pa 0.Pa 0.3Pa N stroke length (mm) Thrust (N)

15 Example of selection Select shock absorber according to example. Example Select shock absorber which stops load smoothly under left figure conditions. v=.0m/s Load =kg Colliding pattern of device equals to "b". Summarize required conditions to calculate. a. Colliding object weight = kg b. Colliding speed =.0m/s c. Cylinder thrust = / mm 0.Pa = 9.7N 3 Check specifications. a. requency cycle/min. : NG, since max. repeating cycle of N0 is 9 cycle/min. (must be limited to model below N. ) b. Colliding speed.0m/s : All models are available c. Ambient temperature: Indoor equipment: All models are available d. eturn time: Not specified All models are available ( ) Cylinder requency: cycle/min. (efer to equipment indoors.) P=0.Pa ush speed characteristics graph of colliding object equivalent weight/absorbed energy <Graph > <Graph > pemax. characteristics (colliding speed absorbed energy) Absorbed energy 00 0 () Emax 0. N0 N N7 N. N. N0.7 N0.3 N0. Calculate actual energy. rom pattern figure example "b" a. Kinetic energy: E = m = (kg).0 (m/s) = () Select N. (Emax = ) (St = mm) temporarily, since only E achieved here. b. Thrust: E = S = 9.7 (N) 0.0 (m) =.7 () c. All absorbed energy: E = E + E = () +.7() = 39.7() ecalculate with one size larger N7, since this E = 39.7 () cannot be absorbed by temporarily selected N.. b'. E = S = 9.7 (N) 0.0 (m) = 9. () c'. E = E + E = () + 9. () =. () Go to confirmation of colliding object equivalent weight, since this E =. () can be absorbed by N7. Check colliding object equivalent weight. rom pattern figure example "b" as same as E. () a. Colliding object equivalent weight e = = =.0 (m/s) 9.kg b. N7 e is (kg), so this is larger than calculated colliding object equivalent weight. Therefore, use N7 under these conditions. pe characteristics (colliding speed colliding object equivalent weight) Colliding object equivalent weight (kg) e N Series Selection guide N0 N N7 N. N. N0.7 N0.3 N0. H0 BSA G H HB HD H LB Colliding speed (m/s) p Colliding speed (m/s) p 7

16 H0 BSA G H HB HD H LB Specifications Note: inimum energy absorption to be / of maximum energy absorption. S Series aximum energy absorption: 0.09 to Descriptions Series S Type/classification With adjuster Without adjuster With adjuster Spring return type Spring return type Spring return type (Screw pitch large) ax. energy absorption Stroke length mm ax. energy k/hour absorption per hour ax. colliding speed m/s ax. frequency Cycle/min Ambient temperature C to 0 ax. load N eturn time S 0.3 or less 0. or less 0. or less 0. or less 0. or less 0. or less Product weight kg ecoiling Extended N force Compressed N Copper and PTE free Standard How to order S N A ounting style B Series Note on model no. selection Note : 3 hexagon nuts are provided for N specifications products. <Example of model number> S000.3N odel: A ounting style: Basic type B Series: AX energy.9 C Option: With stop nut How to order accessories S 0.0 A B C Option S 0.0 N B Symbol Descriptions A ounting style 00 Basic type A lange type B Series (AX. energy value) C Option Blank N Standard With stop nut lange bracket ( pc.) Stop nut + hexagon nut (each pc.) Hexagon nut ( pc.) S 0.0 NT B Series Series Series

17 S Series and other devices and other buffer devices As shown at right: The spring accumulates energy and functions as spring return force at the stroke end. Cylinder cushioning (a simple orifice provided to the hydraulic cylinder) has a sudden increase in resistance at collision and does not decelerate smoothly. A shock absorber without an adjuster has a constant absorbed energy so working conditions are limited (S or less). A shock absorber with an adjuster has roughly constant resistance throughout the stroke, uniformly decelerating the object's speed. The curve moves in parallel vertically when adjusted, and collision energy is absorbed appropriately. H0 BSA G H HB HD H LB esistance Stroke length Spring Cylinder cushioning A : The shock absorber is without adjuster adjusted with the adjuster. A

18 S Series H0 BSA G H HB HD H LB Internal structure and operational explanation S Collision Damper case Orifice Air chamber Damper Piston rod Slit valve Cylinder Spring eturn S000.3 to 0 Collision Cylinder Piston rod Damper case Balance valve Adjuster Damper Adjuster pin Detent mechanism eturn Check valve Spring Collision Collision force applied to the damper presses the piston rod and pressurizes oil in the cylinder. When generated hydraulics pass through the orifice and flow into the damper case, shock is absorbed. Oil flowing into the damper case pressurizes the air chamber and decreases air chamber volume. Note) With this product mechanism, internal pressure increases with workpiece speed during collision, generating resistance and absorbing energy. esistance may thus appear low when pressed with a finger, but this poses no problem. eturn When the colliding workpiece is removed, the piston rod is pushed out by the internal spring. At the same time, the slit valve (check valve) is opened by pressure in the air chamber. Oil flows to the inner pipe and at completion, the slit valve closes. Collision Collision force applied to the damper pushes the piston via the piston rod and pressurizes oil in the cylinder. When generated hydraulics pass through the orifice and balance valve and flow into the damper case, shock is absorbed. When the adjuster is turned clockwise, the adjust pin moves and the force of the balance valve spring increases. Oil flow is decreased and a larger collision force is withstood. Note) With this product mechanism, internal pressure increases with workpiece speed during collision, generating resistance and absorbing energy. esistance may thus appear low when pressed with a finger, but this poses no problem. eturn When the colliding workpiece is removed, the piston rod is pushed out by the internal spring and the check valve is opened by pressure in the air chamber. Oil flows to the inner pipe and at completion, the check valve closes.

19 I I Dimensions S** Basic (00) Symbol odel no. S S000.0 S Basic (00) Symbol odel no. S000.3 S000. S00. S00. S00. S00 S00 S000 S0030 S000 S000 S000. S000. S00.0 HA (Width across flats) H L lange (A) Stop nut (N) Basic (00) lange (A) Stop nut (N) A C E G H I L N d HA ZA ZB P Q T U W X Y S**0.3 to 0, 0. to.0 (Screw pitch large) HA (Width across flats) H L A B E C E d. E G ZA H d I ZA A N (Effective screw section) G C N (Effective screw section) G G A (AX) C G ZB ZB K B (AX) lange (A) Stop nut (N) Basic (00) lange (A) Stop nut (N) K L N d HA ZA ZB P Q S T U W X Y Y Q P Q P W X W X S Q P S Series Dimensions U U. T T Y H0 BSA G H HB HD H LB 3

20 S Series H0 BSA G H HB HD H LB Example of shock absorber Special index table If used for special index table such as rim welding, etc. of wheel, index time can be reduced without damaging to machine. oll over This can be used for automatic turnover mechanism for parts after machining and welding etc. This reduces abrasion of driving section such as drive, gears and pinion, etc., and extends service life. obot This absorbs impact according to diverse parts movement, and prevents part damage. urthermore, production speed can be improved. Press supply This can be used with parts feeding mechanism to die of press (die and stamping model). Deceleration effect according to parts can be obtained without decreasing supply speeds of pneumatics cylinders etc. 3 Switching (directional switching) If used for mechanism of inspection and sorting for physical distribution, this absorbs impact caused by bound of gate, and prevents pneumatic cylinder etc. from damage. Core mold This can be used to stop swing arm in process that injects sand model material. This also increase cycle per unit time according to production number increase.

21 Selection guide Setting of working conditions ake following conditions clear for shock absorber selection. () Load weight (kg) () Colliding speed of instantaneous hit to shock absorber (m/s) (3) If external force applies to load, that thrust (kgf) Symbol D = Cylinder diameter (mm) E = Kinetic energy () P = Operation pressure (Pa) K = adius of gyration (m) (distance of load center to center of rotation) = Colliding angular speed (rad/s) I = oment of inertia (kg/m) = Thrust (N) T = Torque (N m) = Colliding speed (m/s) H = Height (m) St = stroke length (m) = Weight of workpiece (kg) g = Gravity acceleration 9.m/s (3) Horizontal motion (for thrust) E = + St Cylinder =.0m/s =9N If workpiece calculated at () is moved by pneumatic cylinder (D) mm dia. with (P) 0.Pa, thrust of pneumatics cylinder is, = D P = 0. = 9N Check if S00. can be used. E = (.0) Therefore, energy can be absorbed by S 00.. (Graph ) * Adjuster is placed on AX. position. () ertical falling motion (free drop) =70kg E = + g St Where weight () of workpiece is 70kg and drop vertically from 0.7m high (H), check if S 000 can be used. ind max. colliding speed under these conditions. = g H = 9. H = = 3.7m/s < m/s (S000) E = = 7. Absorbed energy of S000 is larger according to colliding speed characteristics graph of absorbed energy on Graph. Therefore, energy can be absorbed by S 000. () Slope dropping motion =70kg L=0.mm St = 30 Where 70kgf weight workpieces drop on 30 slope, check if S000 can be used. ind max. colliding speed under same conditions. = 9. H (H = 0. sin30 ) = sin30 =.m/s < 3m/s E = ( 70. ) + ( sin30 ) 93. Therefore, energy can be absorbed by S 000. Example of calculation H = 0.7m St E = ( ) + (g/st/sin ) p/e max. characteristics (colliding speed/absorbed energy) * Adjuster is placed on AX. position. 0 () Horizontal motion (inertia motion) E = =.0m/s =kg If weight () of workpiece is kg and colliding speed ().0m/s. E = (.0) =.0 S00. can be used. () Horizontal rotary motion (inertia motion) I = WK E = Where 70kgf workpiece, radius of gyration (K) 0.m, and colliding angular speed rad/s, check if S00. can be used. I = 70 (0.) = 7.kg/m () 7. () E = = =. S Series Selection guide =70kgf K=0.m Therefore, energy can be absorbed by S00.. * Adjuster is placed on AX. position. H0 BSA G H HB HD H LB Absorbed energy S000. S00. S000. Absorbed energy S000. () S000.3 () E max E max S00. S00. S00 S00.0 Absorbed energy () 00 E max S000 S000 S0030 S000 S Colliding speed (m/s) p Colliding speed (m/s) p Colliding speed (m/s) p * Absorption energy drops at low speed.

22 3 stages of low, medium and high speed are available. Cap is available. (Excluding some sizes) H0 3 stages of High efficiency BSA rush speed screw and 3 types of machining mechanism Large surface area, since G outer pipe is machined with Low speed: single hole thread, increases outgoing orifice structure, radiation effect. edium speed: porous irregular orifice structure, Industrial chrome plated piston rod High speed: multiple orifice structure is provided according to H porous orifice structure and rush speed. HB Available within to 70 C With nonrotating Can be used with wide temperature range due to special oil. mechanism Easy adjustment Lock screw is used for Impact absorption can be adjusted adjusting mechanism not to by adjuster according to colliding HD be out of order during conditions. operation. (Not available for some small models) Easy installation enabled by outer diameter thread Nut is attached to outer diameter thread type of to 7 for low speed, and of to for medium/high speed. Easy installation and position adjustment. H LB SHO

23 3 New shock absorber series available with wide variation. Appropriate impact absorption matching to colliding conditions and characteristics. 0.3 to m/s low speed, models 0.3 to m/s medium speed, models to m/s high speed, models merits () Stop colliding object safely. () Increase manufacture cycle. (3) Extend service life of machine equipment. () Improve environment of machine equipment, and reduce noise level. () Prevent machine from failure. H0 BSA G H HB HD H LB ABSOBE 9

24 H0 BSA G H HB HD H LB Specifications Descriptions Series Type/classification With adjuster Spring return type aximum energy absorption Stroke length mm 30 0 ax. energy k/hour absorption per hour ax. colliding speed L m/s m/s 0.3 to 0.3 to 0.3 to 0.3 to 0.3 to 0.3 to 0.3 to 0.3 to H m/s 0.7 to to to to 3 ax. repeating cycle (0 C) Cycle/min. 0 Ambient temperature C to 70 ax. load L N,900 (resistance) N 37,70,3, H N 3, 3,90 eturn time S 0. or less Product weight Without cap g Capped g ecoiling force Extended N Compressed N Operational principle m Series 7.9 aximum energy absorption:. to Accumulator Inner tube , Piston rod Piston Pressure room, oil Orifice , , or less If body collides to piston rod, that action is transmitted to oil in pressure room enclosed by piston and inner tube. Oil in pressure room flows out from orifice provided in inner tube. esistance shown by following formula occurs at that time. = av + bv + cx (v is colliding speed, and x is moving stroke. a. b. c are constants.). 0.3 to 0.7 to ,0 or less No. shows speed square resistance, and places large percentage in resistance. No. shows viscosity resistance, and places large percentage, if colliding speed is small. No. 3 shows return force of piston rod. (This can be ignored usually, since value is very small compared with No., No. ) The product of resistance generated at this time and the piston rod stroke is the shock absorber absorption energy. The shock absorber realizes ideal impact absorption by controlling No. and. 30

25 How to order A Low speed type L 0. edium speed type High speed type H odel no <Example of model number> 0.C B C C C Series (max. energy absorption) C Option * A odel no.: medium speed type B Series : AX energy. C Option : Capped Symbol Descriptions L B Series (max. energy absorption) C Option Blank C Without cap Capped * : No cap is not available for. (3.7), ( ), 73. (70). is not available. Low speed type H0 BSA G H HB HD H LB A Series How to order odel no. edium speed type High speed type H 3

26 H0 BSA G H HB HD H LB Series Internal structure and parts list ** Parts list No Capped Note: Some structure differs per model. Basic type (without cap) 7 Parts name Packing seal retainer Guide Accumulator Piston Spring pin Inner tube Bottom O ring Back up ring Adjustment shaft Hexagon socket head set screw Stopped cross headed set screw O ring Piston rod aterial Copper alloy Copper alloy Nitrile rubber Copper alloy Stainless steel Steel Copper alloy Nitrile rubber esin Copper alloy Alloy steel Alloy steel Nitrile rubber Alloy steel No Parts name Snap ring U packing seal O ring Hexagon nut Steel ball Spring Outer tube Oil Spacer O ring Product name plate Dial od cap Stiffening ring aterial Steel Nitrile rubber Nitrile rubber Steel Bearing steel Piano wire Steel Oil Nitrile rubber Nitrile rubber Copper alloy esin Steel 3

27 Internal structure and parts list. * C (capped) 73. Parts list No Parts name od cover Piston rod Snap ring (round type) U packing seal O ring Piston Snap ring (E type) Spring pin Outer tube Inner tube Bottom O ring Back up ring Hexagon socket head set screw Product name plate aterial Urethane rubber Alloy steel Steel Nitrile rubber Nitrile rubber Copper alloy Steel Stainless steel Steel pipe Steel pipe Copper alloy Nitrile rubber esin Alloy steel Note : Some structure differs per model. Note : The rod cover (plastic) cap cannot be attached to the and 73. sizes. No Parts name Spring guide Spring Spring guide Packing seal retainer Guide Accumulator Hexagon nut Steel ball Accumulator Oil Washer Adjustment axis Holder screw Label Series Internal structure and parts list aterial Steel Piano wire Steel Copper alloy Copper alloy Nitrile rubber Steel Bearing steel Nitrile rubber Oil Steel Copper alloy Steel Steel H0 BSA G H HB HD H LB 33

28 I H0 BSA G H HB HD H LB Series Dimensions K Standard (**) Capped (**C) odel no. L0. H 0. L0.3 H 0. L0. H 0. * *3 * *. H 0 H 0 St K A D A B. A (AX) C St 30 3 D.. E Note: The above table * shows low speed (L), medium speed (), and high speed (H). C N (screw section) H A (AX) E St C D N (screw section) H Nut width across flats Nut width across flats G B G B G. 0 H I L0.3 H 0. * Adjustment with minus screw driver L0.3C 0.C H *C Adjustment with minus screw driver K N

29 I Dimensions. * C 73. odel no. *.C H C H 73.C E St D N (screw section) G A B K St 0 0 D. 7 E A (AX) Note: The above table * shows low speed (L), medium speed (), and high speed (H). G 3. H H 37 *.C HC I B Nut width across flats K Adjusting dial Lock screw N H0 BSA G H HB HD H LB 3 Adjustment with minus screw driver Series Dimensions 3

30 H0 BSA G H HB HD H LB Dimensions *N (standard type) *CN (capped type) A B (Standard type) (Capped type) odel no. Applicable model A B odel no. Applicable model C D E 0.N L CN L0.C 0.C 3 0.N H0. L CN H0.C L0.3C 0.C. 0.N H0. L CN H0.C L0.C 0.C N H0. L.9 CN H0.C LC C N H L CN HC L3C 3C N H3 L 0 37 CN H3C LC C N H L.. H CN HC L.C.C H.C N 0 L.C 3. H0.CN.C H.C 0N 3. H0 0C 0CN H0C 0CN 0C H0C When using stopper nut, please note on following points. Series optional parts *N/*CN (Stopper nut) E C D If no caps, use this with extending 0.mm to mm forward to piston rod direction from shock absorber (cylinder top). If capped, uses this with extending cap length plus 0.mm to mm forward to piston rod direction from shock absorber (cylinder section). ix with standard nut for shock absorber after stopper nut is installed. This can not be used with deflection angle adaptor. 0. to mm Standard nut for shock absorber 3

31 I Specifications odel no. 0.A 0.A 0.A A 3A A.A 0A 0A ax. working deflection angle Applicable model L0. 0. H0. L H0. L0. 0. H0. L H L3 3 H3 L H L.. H. 0 H0 0 H Dimensions A B C D E G H I K End section material Series optional parts *A (Deflection angle adaptor) *A D 7 7 G C 0 A B E K (overall length) Nut width across flats H 9 3 Width across flats Plastic (PO) Iron system H0 BSA G H HB HD H LB When using deflection angle adaptor, please note on following points. To be C or less from center line of cap section of adaptor for deflection angle. This can not be used with stopper nut. Not available for capped type. 37

32 Series Selection guide flow chart Example of colliding pattern Colliding pattern confirmation Horizontal colliding a. Simple horizontal colliding b. Thrust of cylinder applies c. Drive force of motor applies H0 BSA G E = EI e = No Colliding conditions confirmation ind kinetic energy E Do thrust/selfweight, etc. function? Yes ind temporary stroke length S' according to kinetic energy E (refer to ig. ) Applications Kinetic energy E () Thrust/self energy E () All absorbed energy E () Colliding object equiv. weight e (kg) Absorbed energy per hour Et (/h) E = E = E e = Et = 0 E n d. ree drop CYL E = E = K E = S E = Td S D E = E + E E = E + E E E e = e = Et = 0 E n Et = 0 E n ertical colliding e. Cylinder lower limit stopper f. Cylinder upper limit stopper D Td H HB HD Calculate added energy E to find energy per cycle E = E + E Select orifice according to speed o and energy percent E/E on ig. Select model temporally Calculate E e and max. energy absorption Et per minute according to stroke length of temporally selected model Is E e in accordance with specifications? Yes No ecalculate with one size larger model Applications Kinetic energy E () Thrust/self energy E () All absorbed energy E () Colliding object equiv.weight e (kg) Absorbed energy per hour Et (/h) Applications e= H E = E = g S E = E + E E (= g H) Et = 0 E n g. ree drop L CYL E = E = ( g + ) S E = E = ( g) S E = E + E E = E + E E E e = e = Et = 0 E n Et = 0 E n Slope colliding h. Thrust of cylinder applies i. Thrust of cylinder applies CYL CYL CYL H LB Symbol E E Is Et in accordance with specifications? Working conditions Absorbed energy Kinetic energy Yes Is Et in accordance with specifications? No ecalculate with one size larger model Unit Kinetic energy E () Thrust/self energy E () All absorbed energy E () Colliding object equiv. weight e (kg) Absorbed energy per hour Et (/h) Applications E = E = g S sin E = E + E E e= (= g L sin ) Et = 0 E n E = E = ( g sin + ) S E = E = ( g sin ) S E = E + E E = E + E E E e = e = Et = 0 E n Et = 0 E n Oscillation colliding otation colliding j. ree drop k. otor, etc. torque applies l. otor, etc. torque applies H G r r T D E G S g N e Td K Thrust/selfweight energy Position of center of gravity stroke length Gravity acceleration (9.) Number of rotation Colliding object equivalent weight otor start torque eduction ratio m m/s rpm kg N m Kinetic energy E () Thrust/self energy E () All absorbed energy E () Colliding object equiv. weight e (kg) Absorbed energy per hour Et (/h) E = g H E = or E = D = r T T E = g S E = S E = S E = E + E E = E + E E = E + E E 3 g H E E N e= (= ) e = ( = ) e= (=, = ) r 0 Et = 0 E n Et = 0 E n Et = 0 E n 3

33 selection guide ake colliding pattern of device clear Horizontal motion ertical motion Slope motion Oscillation/rotary motion Note: efer to "Example of colliding pattern". Horizontal colliding Symbol Working conditions Unit Colliding object weight kg Colliding speed m/s Pressure N n requency cycle/min. t Ambient temperature C t eturn time s a. Simple horizontal colliding b. Colliding with thrust of cylinder c. Colliding with drive force of motor d. Colliding by free drop e. Colliding with thrust of cylinder (down) f. Colliding with thrust of cylinder (up) g. Colliding by free slide h. Colliding with thrust of cylinder (down) i. Colliding with thrust of cylinder (up) j. Colliding by free oscillating drop k. Colliding with motor, etc. torque (oscillation) l. Colliding with motor, etc. torque (rotation) ake required conditions/descriptions clear to calculate energy Slope colliding Symbol Working conditions Unit n t t L Colliding object weight Colliding speed Pressure requency Ambient temperature eturn time Colliding object moving distance Angle degree kg m/s N cycle/min. C s m deg ertical colliding Symbol Working conditions Unit n t t H Colliding object weight Colliding speed Pressure requency Ambient temperature eturn time Drop height kg m/s N cycle/min. C s m ibration/rotation colliding Symbol Working conditions Unit Colliding object weight Kg Colliding speed m/s T Torque N m n requency cycle/min. t Ambient temperature C t eturn time s Angular speed rad/s oment of inertia kg m * m r * m Angle degree deg H Drop height m D otor diameter m * Distance from center of rotation to colliging point * Distance from center of rotation to center of gravity 3 Calculate kinetic energy E according to "Example of colliding pattern" Calculate kinetic energy E according to "Example of colliding pattern" (page 3). Applications Kinetic energy E () Thrust/gravity energy E () All absorbed energy E () Colliding object equivalent weight e (kg) Absorbed energy per hour Et (/h) Example of selection ake colliding pattern of device clear ertical colliding e. Cylinder lower limit stopper E = E = (g + )/S E = E + E e = Et = 0 E n Colliding object weight : = kg Colliding speed : =.m/s Pressure : =.N requency : n = cycle/min. Ambient temperature : t = 3 C eturn time : t = s (hour up to recolliding) E = =. =. CYL Series Selection guide E H0 BSA G H HB HD H LB Select temporary stroke length according to temporary selection graph Select temporary stroke length on figure (page ). S' = 30 39

34 Series H0 BSA G H HB HD H LB Calculate absorbed energy E according to "Example of colliding pattern" Calculate thrust/self weight energy E according to "Example of colliding pattern". Calculate S (stroke length of ) in expression with temporary stroke length S' selected at Step. Calculate absorbed energy E according to "Example of colliding pattern". temporary selection Select orifice type according to energy percent (thrust/self weight energy, kinetic energy) on ig. (page ), then select a model temporally according to calculated absorbed energy E. Note : Allowable energy absorption may vary depending on colliding speed. efer to pages to 3. 7 ecalculate absorbed energy E with temporally selected model Calculate absorbed energy E according to "Example of colliding pattern". Calculate S (stroke length of ) in expression with temporary stroke length S' selected at Step. Calculate absorbed energy E according to "Example of colliding pattern". Calculate energy Et per hour Calculate energy per hour Et according to "Example of colliding pattern". 9 Check colliding object equivalent weight Calculate colliding object equivalent weight according to "example of colliding pattern". Selection confirmation If calculated absorbed energy, energy per hour, colliding object equivalent weight, cycle rate, ambient temperature and return time are in accordance with specifications of selected shock absorber, it is OK. If exceeding specifications range, select one size larger shock absorber according to model, selected before, then recalculate conditions. E = ( g + ) S =( 9. +.) 0.03 =. E = E + E =. +. =.9 E E. = = 0.. Select porous orifice (H3) from model larger than E =.9 temporally. E = ( 9. +.) 0.0 =. E =. +. =. Et = 0 E n = 0. = /h E. e = = =.kg. Example of selection Calculated value H3 specified value E. 9. or less Et /h 0 or less e kg. 9 or less n cycle/min. 0 or less t C 3 to 70 t S 0. and over udgment OK OK OK OK OK OK (CAUTION) Use colliding speed just before colliding to shock absorber to select shock absorber by calculation. This speed differs from average speed (cylinder stroke/moving time). Calculate speed just before colliding or find actual speed, or use. to twice average speed for selecting model by calculation. 0

35 Temporary stroke length S' ig.. Temporary selection graph Obtain temporary stroke S' from kinetic energy E. Absorbing characteristics structure Constant orifice Displacement reliant orifice (mm) Single hole orifice structure ultiple orifice structure Porous irregular orifice structure Kinetic energy E () ig.. Energy ratio (thrust/self weight energy, inertia energy E) efer to the following diagram to select the orifice. Single hole orifices include a dash pot structure that uses the clearance between the piston and cylinder tube, a single tube structure that has an orifice on the piston, and a double tube single hole structure (adjustable). Each type has similar resistance characteristics. The common single tube structure is explained here. The piston, which has a single orifice, slides in the cylinder tube filled with oil. The orifice area is constant throughout the full stroke, so resistance increases immediately after collision, and decreases as the stroke advances and speed drops. This orifice has a double structure consisting of an outer and inner tubes. The piston slides along the inner wall of the inner tube. This inner tube has several orifices set in the direction of the stroke. The orifice area gradually decreases as the stroke advances and speed drops. esistance thus fluctuates in a wave, but maximum resistance is suppressed at a low level. Based on orifice design, absorption characteristics are matched to individual collision conditions. Structurally, this type is basically the same as the multiple orifice above, but by changing the orifice, energy is absorbed based on the purpose instead of with constant attenuation force. or example, the orifice in the Series absorbs kinetic energy with the first half of the stroke and controls speed with the second half. Energy is absorbed ideally for cylinder thrust. Energy ratio E/E 3 0 Single hole orifice L Porous irregular orifice ( step motion) ultiple orifice H Colliding speed (m/s) Series Selection guide S S S H0 BSA G H HB HD H LB

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