BALL SPLINE STROKE BALL SPLINE STRUCTURE AND ADVANTAGES・ B-2 TYPES・ ・・・・・・・・・・・・・・・・・・・・・・・・・・・ B-3 ACCURACY・ ・・・・・・・・・・・・・・・・・・・・・・ B-5 PRELOAD AND CLEARANCE IN ROTATIONAL DIRECTION・ B-6 STRENGTH OF SPLINE SHAFT・・・・ B-7 LOAD RATING・・・・・・・・・・・・・・・・・・・・・ B-8 CALCULATION OF DEFLECTION AND DEFLECTION ANGLE OF SPLINE SHAFT・ B-9 ALLOWABLE ROTATIONAL SPEED OF SPLINE SHAFT・ B-10 LIFE CALCULATION・ ・・・・・・・・・・・・・・ B-11 OPERATING CONDITIONS・・・・・・・・・ B-11 LUBRICATION・・・・・・・・・・・・・・・・・・・・・ B-12 HOLLOW SPLINE SHAFT・ ・・・・・・・・・ B-12 SPECIAL REQUIREMENTS・・・・・・・・・ B-12 USE AND HANDLING PRECAUTIONS・ B-13 MOUNTING・・・・・・・・・・・・・・・・・・・・・・・・ B-14 DIMENSION TABLE・・・・・・・・・・・・・・・・ B-18〜 STRUCTURE AND ADVANTAGES・ B-46 ACCURACY・ ・・・・・・・・・・・・・・・・・・・・・・ B-47 PRELOAD AND CLEARANCE IN ROTATIONAL DIRECTION・ B-48 COMPARISON OF DYNAMIC FRICTIONAL RESISTANCE・ B-48 USE AND HANDLING PRECAUTIONS・ B-49 DIMENSION TABLE・・・・・・・・・・・・・・・・ B-50〜 BALL SCREW SPLINE STRUCTURE AND ADVANTAGES・ B-52 PRELOAD・ ・・・・・・・・・・・・・・・・・・・・・・・・ B-52 USE AND HANDLING PRECAUTIONS・ B-52 ACCURACY・ ・・・・・・・・・・・・・・・・・・・・・・ B-53 SPBR TYPE MOTION PATTERN・ ・・ B-54 SPBF TYPE MOTION PATTERN

BALL SPLINE BALL SPLINE The NB ball spline is a linear motion mechanism utilizing the rolling motion of ball elements that can sustain loads and transfer torque simultaneously. It can be used in a wide variety of applications including robotics and transport type equipment. TYPES TYPES OF SPLINE NUT A wide variety of spline nut designs are available and all spline nuts come with side-seals as a standard feature. Table B-1 Types of Spline Nut type of nut Ease of Additional Custom Machining Since a round shaft with raceway grooves is used, NB ball spline shafts can be easily machined to customized...

BALL SPLINE ACCURACY TYPES OF SPLINE SHAFT Depending on the application requirements, either a ground spline shaft or a non-ground (commercial grade) spline shaft is available. The NB ball spline is measured for accuracy at the points shown in Figure B-2 and categorized as either highgrade (blank) or precision-grade (P). Contact NB for accuracy information on the commercial type ball spline. Figure B-2 Accuracy Measurement Points Table B-2 type of spline shaft ground spline shaft Note: The support area is the portion where, for example, radial bearings are attached in order to support the spline...

BALL SPLINE STRENGTH OF SPLINE SHAFT Table B-5 ④Radial Runout of Outer Surface of Spline Nut Relative to Spline Shaft Support Area (Max.) unit： μm total length of SSP4 SSP5AM SSP8 SSP10 spline shaft SSP4AM SSP6 SSP8AM SSP10AM (mm) SSP6AM high- precision high- precision high- precision high- precision greater or less grade grade grade grade grade grade grade grade than ─ 200 46 26 46 26 46 26 36 20 SSP100 SSP100L high- precision grade grade 30 16 ★ SSP13A, 16A maximum length: 1500mm ★★ Please contact NB for shaft lengths exceeding 2000mm. Table B-7 Preload and Operating Condition preload standard...

BALL SPLINE CALCULATION OF DEFLECTION AND DEFLECTION ANGLE OF SPLINE SHAFT The following formulas are used to obtain the deflection and its angle of the ball spline shaft. Typical conditions are listed in Table B-10. Table B-8 Cross-sectional Characteristics of Spline Shaft I moment of inertia part number of area mm4 IP polar moment of inertia of area mm4 ZP polar modulus of section mm3 support method Table B-10 Formulas for Calculating Deflection and Deflection Angle support 5 ┃ support fixed 6 ┃ fixed basic static load vertical rating horizontal fixed ┃ free support ┃ support fixed ┃ fixed...

BALL SPLINE ALLOWABLE ROTATIONAL SPEED OF SPLINE SHAFT When the rotational speed is increased and approaches the spline shaft resonant frequency, the spline shaft is disabled from further operation. This speed is called the critical speed and can be obtained by the following equations. In order to leave a sufficient safety margin, the allowable operating speed should be set at about 80% of the calculated value. Using the following equations, select the size of ball spline shaft. First, calculate Id and A by equation (8) and (9) then, substitute the values into equation (7). 2 ・d×103 I NC＝60 2π...

BALL SPLINE LUBRICATION The spline nut is prelubricated with lithium soap based grease prior to shipment for immediate use. Please relubricate with a similar type of grease periodically depending on the operating conditions. Low dust generation grease is available from NB standard grease. (refer to page Eng-39) The NB spline nut has seals as standard. The seals work well to contain the grease inside the nut especially for the ground shaft, since the seal shape approximates the spline shaft profile. Figure B-10 Example of Lubrication Mechanism A Set of Spline Nut and Spline Shaft Figure B-12 NB...

BALL SPLINE MOUNTING Mounting of SSP Type Examples of installing the SSP type are shown in Figures B-14 and B-15. Example of installing the SSPM type are shown in Figure B-17. Figure B-15 Using a Push Plate Figure B-14 Using a Retaining Ring Figure B-17 Using SSP4AM Lock Plates Examples of installing the SSPM type are shown in Figures B-18,19,22 and 23. Figure B-18 Using F Type Lock Plates The SSP type spline nut comes with a key shown in Figure B-16. Table B-15 Major Dimensions of Key a part number F Type Lock Plate (Standard Plate) 0.2 The lock plate shown in Figure B-19 is provided with the...

BALL SPLINE LP Type Lock Plate (Optional Plate) Mounting of SSPF Type The LP type lock plate is also available for purchase with the SSPM spline nut. Material: SUS304CSP Examples of installing the SSPF type are shown in Figure B-24. Figure B-24 Examples of installing SSPF Type Figure B-21 LP Type Lock Plate BALL SPLINE When using the LP type lock plate, please machine the housing as shown above. Table B-17 LP Type Lock Plate part number lock plate major dimensions G t R X mm mm mm mm machined housing dimensions B E GM M mm mm mm Figure B-23 Using Special Lock Plates (2) Mounting of SSPT Type...

BALL SPLINE part number structure example SSP 80 L - 2 - T1 - 600 - P / CU accuracy grade blank: high P: precision nominal diameter BALL SPLINE with special specification specification SSP: standard SSPS: anticorrosion When two spline nuts are used in close contact. spline shaft total length nut length blank: standard L: long preload symbol blank: standard T1: light T2: medium number of nuts attached to one shaft Note: retainer material is resin. part number standard SSP type spline nut comes with a key （refer to page B-14） . mass shaft