Ball spline structure and advantages

Understand ball spline
Ball spline uses balls installed in the outer cylinder of the spline shaft to smooth the transmission torque of the rolling machine in precision ground rolling grooves. It adopts a unique contact point design with a larger contact angle (40 °), which not only has high sensitivity, but also greatly improves the responsibility ability. It is suitable for environments with excessive vibration and impact loads, high positioning accuracy requirements, and high-speed motion performance. It can also play an effective role in such environments. At the same time, even when used as a substitute for linear ball bushings, the rated load of ball splines is more than ten times that of linear rail bushings with the same shaft diameter, making the world very compact. Even under cantilever loads, torques, and other effects, they can be safely used and have high durability.
The second point is to understand the structure of ball splines
Ball splines can be divided into five types: circular flange SLF type, cylindrical SLT type, reinforced dust-proof SZF type, Fabry Perot SOF type, and cylindrical SOT type. Due to the size of the shaft diameter, the contact path of the steel ball can be divided into 2 rows (180 °) (SLF/SLT/SZF6-20), (SOT/SOF8-25), and 4 rows (70 °) (SLF/SLT/SZF25-50). In addition, hollow shafts are also available for selection.
The third point is to elaborate on the advantages of ball splines
1. High load capacity
The rolling groove of the ball is precision ground and formed, and adopts a Goethe type 40 ° angle contact. Due to the large contact angle, it has a large load capacity in both radial and torque directions.
2. Zero clearance in rotation direction
By using 2-4 rows of relative ball bearings with a contact angle of 40 °, the spline is combined with the spline outer cylinder, and the clearance in the rotation direction can be zero by adjusting the preload method.
3. Highly sensitive
Due to the special design of the contact point of the steel ball, in addition to high rigidity, it is more sensitive and can reduce the waste of capacity.
4. High rigidity
Due to the large contact angle, it has high rigidity and can be subjected to appropriate preloading depending on the situation, thus achieving high torque rigidity.
5. Easy assembly
Due to the special design, the spline outer cylinder is promptly detached from the spline shaft, and the steel ball will not fall off. Therefore, assembly, maintenance, and inspection are all easy to carry out.