Precision Ball Screw Spline

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2 Precision Ball Screw Spline A-

3 Precision Ball Screw Spline Design Principle The Precision Ball Screw Spline contains Ball Screw grooves and Ball Spline grooves that cross each other on a single shaft. The Precision Ball Screw Spline nut has a special designed support bearing directly set up on the outer ring of the nuts. The Precision Ball Screw Spline is capable of performing three modes of motion (rotational, linear and spiral) with a single shaft by rotating or stopping the spline nut. Features High Positioning Accuracy The Ball Spline groove profile is designed Gothic arch. By applied preload, the backlash in the rotational is eliminated therefore having higher positioning accuracy. Lightweight and Compact Spline nut and the support bearing is integration structure. The Spline nut is designed lightweight. Therefore, the highly accurate and compact design is achieved. Simple Installation The balls recirculation in ball holder, prevent balls falling from the spline nut while assembling. Support Bearing The support bearing of the Ball Screw is designed a contact angle of 45, thus it has higher axial rigidity, while Ball Spline has a contact angle of 45, thus it has the average force of axial and radial. Smooth Motion and Lower Noise As the Ball Screw is adapting end cap recirculation structure, thus can be smooth motion with lower noise. A-

4 PRECISION BALL SCREW/SPLINE Fig. Model PBSA Precision Ball Screw Spline Applications SCARA robot, Assembly robot, Automatic loader, and Machining center's, ATC equipment. A-3

5 Types and Features Types of Precision Ball Screw Spline Types of Precision Ball Screw Spline Model PBSA Spline nut and the support bearing is integration structure. Fig. Types of Precision Ball Screw Spline Model PBSA A-4

6 Product Explanation of Precision Ball Screw Spline Nomenclature PBSA S-.8 Accuracy Grade Type of shaft S:Solid H:Hollow Shaft length Thread length Lead Outside diameter. Nut Type PRECISION Precision Ball Screw Spline BALL SCREW/SPLINE Accuracy Standards The Precision Ball Screw Spline is manufactured with the following specifications. Ball Screw Axial clearance or less Lead angle accuracy C5 (For detailed specifications, see Table [A-6], Table 3[A-7]) Ball Spline Clearance in the rotational or less (FC light preload) (For detail specifications, see Section [B-5]) Accuracy grade Class H A-5

7 C A E A A B D B F B Spline nut Ball Screw nut Fig.3 Model PBSA Table Accuracy Standards Unit: mm Model No. C D E F PBSA PBSA PBSA A-6

8 Action Patterns Basic Actions Ball screw nut PRECISION Precision Ball Screw Spline BALL SCREW/SPLINE Ball screw nut pulley N Spline nut pulley N Spline nut Shaft l Ball screw lead(mm ) N Ball screw nut rotational speed(min - ) N V Spline nut rotational speed( min - ) Feed rate(mm/min) A-7

9 Input Shaft motion Motion Action Ball screw pulley Ball spline pulley (speed) (rotation speed) down N (Forward) V = N.l (N ) up -N (Reverse) V = -N.l (N ) Rotation forward N N (Forward) N (Forward) (N =N ) reverse -N -N (Reverse) -N (Reverse) (-N =-N ) Spiral up forward N (N ) V = N.l N (Forward) down reverse -N (-N ) V = -N.l -N (Reverse) A-8

10 Extended Actions Input Shaft motion PRECISION BALL SCREW/SPLINE Motion Up down forward Up down reverse Action up down Ball screw pulley -N (Reverse) N (Forward) Ball spline pulley (speed) V = -N l (N ) V = N l (N ) (rotation speed) Precision Ball Screw Spline 3 forward N N (Forward) N (Forward) (N = N ) up -N V = -N l (N ) 6 5 down N V = N l (N ) 6 reverse -N -N (Reverse) -N (Reverse) (-N =-N ) down Up forward down Up reverse down N V=N l (N ) up -N V=-N l (N ) 3 forward N N N (N = N ) 6 4 down N V=N l (N ) up -N V=-N l (N ) 6 down -N -N -N (-N = -N ) A-9

11 Input Shaft motion Motion Action Ball screw pulley Ball spline pulley (speed) (rotation speed) Down forward up reverse down N V=N l (N ) Rotationa forward N N N (N = N ) up -N V=-N l (N ) 4 reverse -N -N -N (-N = -N ) Down up reverse forward down N V=N l (N ) up -N V=-N l (N ) 4 3 reverse -N -N -N (-N = -N ) 3 4 forward N N N (N = N ) A-

12 Example of Assembly PRECISION BALL SCREW/SPLINE Support bearing Housing Shaft Ball screw nut Pulley Precision Ball Screw Spline Housing Pulley Support bearing Spline nut Example of installing the ball screw nut input pulley and the spline nut input pulley inside the housing and the maximum stroke can be achieved. A-

13 PRECISION Product BALL SCREW/SPLINE Specifications PBSA ØW 6-Sxt (36 均分 ) Ø W Precision Ball Screw Spline Ball Spline Shaft Inner diameter diameter Basic load rating Ca Co Basic torque rating C T (N m) C OT (N m) Static permissible moment M A (N m) Nut diameter D h7 D L X W Ball Screw O.D. Screw size Inner diameter Lead Effective turns Circuit Row Basic load rating Ca Co Nut diameter D3 h7 L X W A D4 g6 D A-

14 PBSA Product E L L L L3 E PRECISION BALL SCREW/SPLINE X T T X B B ØW3 4-S ØW Specifications ØDh7 ØA ØDg6 ØD ØD5 ØD4g6 ØA ØD3h7 ØD6 Precision Ball Screw Spline A D g6 T L W S t E Support bearing basic load rating Ca Co Nut (kg) Mass Shaft (kg/m) M4.7P M5.8P M5.8P D6 T L3 W3 S B B E Support bearing basic load rating Ca Co Nut (kg) Mass Shaft (kg/m) M4.7P M5.8P M6 P A-3