Precision Ball Screw/Spline

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1 58-2E Models BNS-A, BNS, NS-A and NS Seal Outer ring Shim plate Seal Spline nut Seal Collar Shim plate Seal End cap Ball Outer ring Ball screw nut Outer ring Ball Retainer Retainer Outer ring Point of Selection Options Model No. Precautions on Use Accessories for Lubrication Mounting Procedure and Maintenance A A B DN Value Accuracy Standards Action Patterns Example of Assembly Example of Use Precautions on Use A

2 58-2E Structure and Features The /Spline contains the grooves and the Ball Spline groove crossing one another. The nuts of the and the Ball Spline have dedicated support bearings directly embedded on the circumference of the nuts. The /Spline is capable of performing three (rotational, linear and spiral) modes of motion with a single shaft by rotating or stopping the spline nut. It is optimal for machines using a combination of rotary and straight motions, such as scholar robot s Z-axis, assembly robot, automatic loader, and machining center s ATC equipment. Zero Axial Clearance The Ball Spline has an angular-contact structure that causes no backlash in the rotational direction, enabling highly accurate positioning. Lightweight and Compact Since the nut and the support bearing are integrated, highly accurate, compact design is achieved. In addition, small inertia because of the lightweight ball screw nut ensures high responsiveness. Easy Installation The Ball Spline nut is designed so that balls do not fall off even if the spline nut is removed from the shaft, making installation easy. The /Spline can easily be mounted simply by securing it to the housing with bolts. (For the housing s inner- tolerance, H7 is recommended.) Smooth Motion with Low Noise As the is based on an end cap mechanism, smooth motion with low noise is achieved. Highly Rigid Support Bearing The support bearing on the has a contact angle of 6 in the axial direction while that on the Ball Spline has a contact angle of 3 in the moment direction, thus to provide a highly rigid shaft support. In addition, a dedicated rubber seal is attached as standard to prevent entry of foreign materials Ball Spline Fig.1 Structure of Support Bearing Model BNS-A Fig.2 Structure of Support Bearing Model BNS

3 58-2E Type No Preload Type Model BNS-A Specification Table Model BNS Specification Table (Compact type: linear-rotary motion) (Heavy-load type: linear-rotary motion) Model NS-A Specification Table Model NS Specification Table (Compact type: straight motion) (Heavy-load type: straight motion)

4 58-2E Accuracy Standards The /Spline is manufactured with the following specifi cations. Axial clearance : or less Lead angle accuracy : C5 (For detailed specifications, see A, A.) Ball Spline Clearance in the rotational direction : or less (CL: light preload) (For detailed specifications, see A.) Accuracy grade : class H (For detailed specifications, see A.) C A E A H A A B D B F B Spline nut Ball screw nut Model BNS A B I B Spline nut Model NS Ball screw nut Model No. C D E F H I BNS 812 NS 812 BNS 115 NS 115 BNS 1616 NS 1616 BNS 22 NS 22 BNS 2525 NS 2525 BNS 3232 NS 3232 BNS 44 NS 44 BNS 55 NS Unit: mm

5 58-2E Action Patterns Model BNS Basic Actions Ball screw nut Ball screw nut pulley: N1 Spline nut Spline nut pulley: N2 l: Ball screw lead (mm) N1: Ball screw nut rotational speed (min 1 ) N2: Spline nut rotational speed (min -1 ) 1. Motion (1) Action direction Ball screw pulley direction down N 1 direction (Forward) Input pulley direction (speed) V=N 1 l (N 1 ) motion direction (rotation speed) 1 2 (2) direction up N 1 direction (Reverse) V= N 1 l (N 1 ) 2. Rotation (1) direction direction forward N 1 N 2 (Forward) N 2 (Forward) (N 1 =N 2 ) 2 1 (2) direction direction reverse N 1 N 2 (Reverse) -N 2 (Reverse) ( N 1 = N 2 ) 3. Spiral (1) direction up direction forward N 2 (N 2 ) V=N 2 l N 2 (Forward) 1 2 (2) direction down direction reverse N 2 (-N 2 ) V= N 2 l N 2 (Reverse)

6 58-2E Model NS Basic Actions Ball screw nut Ball screw nut pulley: N1 Spline nut l: Ball screw lead (mm) N1: Ball screw nut rotational speed (min 1 ) Motion Action direction Input Ball screw pulley motion direction (speed) (1) (2) direction down direction up N 1 (Forward) N 1 (Reverse) V=N 1 l (N 1 ) V= N 1 l (N 1 )

7 58-2E Model BNS Extended Actions Motion 1. Up down forward up down reverse (1) (2) Action direction direction up direction down Ball screw pulley N 1 (Reverse) N 1 (Forward) Input pulley direction (speed) V= N 1 l (N 1 ) V=N 1 l (N 1 ) motion direction (rotational speed) (3) direction forward N 1 N 2 (Forward) N 2 (Forward) (N 1 =N 2 ) (4) (5) direction up direction down N 1 N 1 V= N 1 l (N 1 ) V=N 1 l (N 1 ) 6 (6) direction reverse N 1 N 2 (Reverse) -N 2 (Reverse) ( N 1 =N 2 ) 2. Down up forward down up reverse (1) (2) direction down direction up N 1 N 1 V=N 1 l (N 1 ) V= N 1 l (N 1 ) (3) direction forward N 1 N 2 N 2 (N 1 =N 2 ) (4) (5) (6) direction down direction up direction reverse N 1 N 1 V=N 1 l (N 1 ) V= N 1 l (N 1 ) N 1 N 2 N 2 ( N 1 =N 2 ) 3. Down forward up reverse (1) (2) direction down direction forward N 1 V=N 1 l (N 1 ) N 1 N 2 N 2 (N 1 =N 2 ) 4 (3) direction up N 1 V= N 1 l (N 1 ) (4) direction reverse N 1 N 2 N 2 ( N 1 =N 2 ) 4. Down up reverse forward (1) (2) direction down direction up N 1 N 1 V=N 1 l (N 1 ) V= N 1 l (N 1 ) 4 (3) direction reverse N 1 N 2 N 2 ( N 1 =N 2 ) (4) direction forward N 1 N 2 N 2 (N 1 =N 2 )

8 58-2E Example of Assembly Seal Pulley Support bearing Ball screw nut Support bearing Spline nut Seal Pulley Example of installing the ball screw nut input pulley Example of installing the ball screw nut pulley and the spline nut input pulley, both outside the housing. inside the housing. The housing length is minimized. Fig.3 Example of Assembling Model BNS Pulley Seal Support bearing Ball screw nut Spline nut Example of installing the ball screw nut pulley outside Example of installing the ball screw nut pulley the housing. inside the housing. The housing length is minimized. Fig.4 Example of Assembling Model NS

9 58-2E Example of Use Ball screw input motor Spline input motor Spline nut Chuck Stroke Stroke Pulley Ball screw nut Support bearing Pulley Fig.5 Example of Using Model BNS

10 58-2E Precautions on Use Lubrication When lubricating the /Spline, attach the greasing plate to the housing in advance. Greasing plate Grease nipple Housing Fig.6 Lubrication Methods

11 58-2E Model BNS-A Compact Type: Linear-Rotary Motion 4-S (9 equidistant) 6- d1 (6 equidistant) P2 P1 (Models BNS 1616A to 44A) 4-S (9 equidistant) (9 equidistant) 4- d1 Model No. Screw shaft outer Screw shaft inner Lead P2 P1 (Models BNS 812A and 115A) Basic load rating Ball centerto-center Thread minor Outer Ball screw dimensions Ca C a D Flange length D 3 D 4 d db Ph kn kn dp dc g6 D 1 L 1 h7 H7 BNS 812A BNS 115A BNS 1616A BNS 22A BNS 2525A BNS 3232A BNS 44A dimensions Model No. Basic load rating Static Basic torque rating Outer permissible C C moment Flange Overall C T C T D 7 D 6 length M A kn kn N-m N-m N-m g6 D 5 L 2 h7 BE 1 BNS 812A BNS 115A BNS 1616A BNS 22A BNS 2525A BNS 3232A BNS 44A Note) For K hollow shaft, please refer to the db dimension for the inner bore of the shaft. If requested solid shaft is also available. See Ball Spline A for details. Model number coding BNS22A +5L Model number Overall shaft length (in mm)

12 58-2E t Te L1 B5 B4 H BE D D7 BE1 L2 B6B7 H1 6- ds1 (6 equidistant) 6-S1 t1 (6 equidistant) D1 D3 D4 dp db (Models BNS 812A to 44A) L2 B6B7 H1 H2 (Models BNS 1616A to 44A) (Models BNS 1616A to 44A) L2 B6 B7 H1 d D6 D5 4- ds1 (9 equidistant) P4 P3 4-S1 t1 (9 equidistant) D7 BE1 D6 D5 D7 BE1 D6 D5 (Model BNS 812A) (Model BNS 115A) Support bearing basic load rating Ca C a (Models BNS 812A and 115A) inertial moment Screw shaft inertial moment/mm Unit: mm BE H B 4 B 5 Te P 1 P 2 S t d 1 kn kn kg cm 2 J kg cm 2 /mm kg kg/m M M M M M M M P4 P3 Unit: mm Support bearing basic load rating inertial moment C C H 1 B 6 B 7 H 2 P 3 P 4 S 1 t 1 d S1 kn kn kg cm 2 kg M M M M M M M Options

13 58-2E Model BNS Heavy-load Type: Linear-Rotary Motion 4-S θ (6 equidistant) 6- d1 Model No. Screw Screw shaft shaft outer inner Lead P2 P1 Basic load rating Ca C a Ball centerto-center Thread minor Outer Ball screw dimensions Flange Overall length D 3 d db Ph kn kn dp dc D D 1 L 1 h7 BNS BNS BNS BNS BNS BNS dimensions Basic load rating Static Basic torque rating Model No. permissible Outer Flange Overall C C moment C T C T length kn kn M A N-m N-m N-m D 7 D 5 L 2 BNS BNS BNS BNS BNS BNS Note) Dimension U indicates the length from the head of the hexagonal-socket-head type bolt to the ball screw nut end. For K hollow shaft, please refer to the db dimension for the inner bore of the shaft. If requested solid shaft is also available. See Ball Spline A for details. Model number coding BNS L Model number Overall shaft length (in mm)

14 58-2E t Te B5 H L1 B4 L2 B6 H1 B7 6- ds1 (6 equidistant) 6-S1 t1 D1 D3 D4 dp db D D7 d D6 D5 Note) U P4 P3 Unit: mm Support bearing basic load rating inertial moment Screw shaft inertial moment/mm D 4 Ca C a H7 H B 4 B 5 Te P 1 P 2 S t d 1 kn kn kg cm 2 J kg cm 2 /mm kg kg/m M M M M M M Support bearing basic load rating inertial moment Unit: mm D 6 C C h7 H 1 B 6 B 7 P 3 P 4 S 1 t 1 d S1 U kn kn kg cm 2 kg M M M M M M Options

15 58-2E Model NS-A Compact Type: Straight Motion 4-S (9 equidistant) 6- d1 (6 equidistant) (Models NS 1616A to 44A) 4-S (9 equidistant) P2 P1 4- d1 (9 equidistant) Screw shaft outer Screw shaft inner Lead P2 P1 (Models NS 812A and 115A) Basic load rating Ball centerto-center Outer Ball screw dimensions Thread Model No. minor Flange Overall Ca C a D D 3 D 4 length d db Ph kn kn dp dc g6 D 1 L 1 h7 H7 NS 812A NS 115A NS 1616A NS 22A NS 2525A NS 3232A NS 44A Model No. Basic load rating Static Basic torque rating permissible C C moment C T C T dimensions Outer M A kn kn N-m N-m D 7 D 5 N-m NS 812A NS 115A NS 1616A NS 22A NS 2525A NS 3232A NS 44A Flange Note) For K hollow shaft, please refer to the db dimension for the inner bore of the shaft. If requested solid shaft is also available. See Ball Spline A for details. Model number coding NS22A +5L Model number Overall shaft length (in mm)

16 58-2E D1 D3 D4 dp B5 t Te db L1 B4 H BE D D7 r L2 B6 H1 D5 d 4- ds1 through hole, d2 counter bore depth h (9 equidistant) (Models NS 1616A to 44A) D1 D3 D4 dp B5 t Te L1 B4 H (Models NS 1616A to 44A) D BE 3- d D7 r L2 B6 H1 d D5 P3 (Models NS 1616A to 44A) 4- ds1 through hole, d2 counter bore depth h (9 equidistant) d (Models NS 812A and 115A) (Models NS 812A and 115A) (Models NS 812A and 115A) Support bearing basic load rating Ca C a inertial moment Screw shaft inertial moment/mm Unit: mm BE H B 4 B 5 Te P 1 P 2 S t d 1 kn kn kg cm 2 J kg cm 2 /mm kg kg/m M M M M M M M P3 Unit: mm Overall length Greasing hole Mounting hole L 2 H 1 B 6 r d P 3 d S1 d 2 h kg Options

17 58-2E Model NS Heavy-load Type: Linear Motion 4-S θ (6 equidistant) 6- d1 Screw shaft outer Screw shaft inner Lead P2 P1 Basic load rating Ball centerto-center minor Thread Ball screw dimensions Model No. Outer Flange Overall Ca C a length D 3 d db Ph kn kn dp dc D D 1 L 1 h7 NS NS NS NS NS NS dimensions Basic load rating Static Basic torque rating Model No. permissible Outer C C moment C T C T kn kn M A N-m N-m N-m D 7 NS NS NS NS NS NS Note) For K hollow shaft, please refer to the db dimension for the inner bore of the shaft. If requested solid shaft is also available. See Ball Spline A for details. Model number coding NS L Model number Overall shaft length (in mm)

18 58-2E L1 (9 equidistant) t Te B5 H B4 r L2 B6 H1 4- ds1 through hole, d2 counter bore depth h D1 dp D4 D3 db D D7 D5 d 3- d Support bearing basic load rating D 4 Ca C a inertial moment P3 Screw shaft inertial moment/mm Unit: mm H7 H B 4 B 5 Te P 1 P 2 S t d 1 kn kn kg cm 2 J kg cm 2 /mm kg kg/m M M M M M M Flange Overall length Greasing hole Mounting hole D 5 L 2 H 1 B 6 r d P 3 d S1 d 2 h kg Unit: mm Options

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