Product Overview
Ball spline is a rolling linear motion assembly composed of spline shaft, spline nut, steel balls and retainer. It transmits torque while allowing smooth linear sliding along the shaft. With circulating steel ball rolling contact, it achieves low friction, high precision and high rigidity. Available in solid shaft and hollow shaft versions, cylindrical nut and flange nut designs. Widely applied in automation equipment, robotic arms, dispensing machines, semiconductor handling and precision positioning systems.
Key Features
- Dual function: torque transmission + linear motion: Simultaneously transfer rotary torque and allow axial sliding
- Rolling contact structure: Low friction, high speed and high acceleration performance
- Preload optional: Eliminate rotational backlash, improve positioning rigidity
- High load capacity: Withstand radial load, torque and moment load
- Multiple nut styles: Cylindrical / Flange / Rotary type; solid or hollow spline shaft
- High precision grades: Normal / High / Precision grade, customizable shaft length
- Seal option: Dust-proof seals to protect internal balls from contamination
Technical Parameters
表格
| Item | Specification |
|---|---|
| Material | Spline shaft: Chromium steel / Alloy steel; Nut: Bearing steel; Ball: Chrome steel |
| Shaft Diameter | φ4mm – φ100mm (custom size) |
| Shaft Type | Solid shaft / Hollow shaft |
| Nut Type | Cylindrical nut / Flange nut / Rotary spline nut |
| Precision Grade | C (Normal), H (High), P (Precision) |
| Preload | Light / Medium / Heavy preload, non-preload available |
| Surface Hardness | HRC 58–62 |
| Shaft Surface Roughness | Ra ≤ 0.2μm |
| Basic Dynamic Load Rating Cr | 0.42kN ~ 136.2kN |
| Basic Static Load Rating C0 | 0.48kN ~ 195kN |
| Working Temperature | -20℃ ~ +80℃ |
| Max Linear Speed | 1~3 m/s (depends on lubrication and preload) |
Application
- Industrial robot arms & rotary actuators
- Automatic dispensing machines and assembly equipment
- Semiconductor wafer handling & inspection equipment
- Automation linear sliding platforms
- Laser processing, optical testing equipment
- New energy battery production machines
Ball Spline vs Linear Guide
表格
| Item | Ball Spline | Linear Guide Rail |
|---|---|---|
| Main Function | Transmit torque + linear movement | Only linear motion, cannot transfer torque |
| Load Type | Radial, torque & moment load | Radial load mainly |
| Backlash | Rotational backlash controllable with preload | No torque transmission |
| Structure | Shaft + spline nut | Rail + slider |
| Best For | Rotary + sliding combined motion | Simple straight linear travel |
