Ball spline Ball bearings housed in the outer sleeve of a splined shaft roll smoothly within precisely ground rolling grooves while transmitting torque. Thanks to a unique contact design featuring an increased contact angle (40°), these bearings not only offer high sensitivity but also significantly enhance load-carrying capacity. They are ideally suited for environments characterized by excessive vibration and shock loads, stringent positioning accuracy requirements, and demands for high-speed performance—environments in which they can perform effectively. Moreover, even when used as a direct replacement for linear ball bushings, ball splines exhibit a rated load capacity that is more than ten times greater than that of linear bushings at the same shaft diameter. As a result, the design can be remarkably compact, allowing for safe operation even under cantilevered loads and torques, and ensuring exceptional durability.

　　Advantages of ball splines:

　　1. High load capacity

　　The ball’s raceway grooves are precision-ground and feature a 40° contact angle in the Gothic style. Due to the large contact angle, these bearings offer high load-carrying capacity in both the radial and torque directions.

　　2. Zero backlash in the rotational direction

　　The splined shaft is fitted with balls arranged in 2 to 4 rows, each having a contact angle of 40°, and is combined with the outer sleeve of the spline. By adjusting the preload method, the clearance in the rotational direction can be reduced to zero.

　　3. High sensitivity

　　Thanks to the special design of the steel ball’s contact point, in addition to its high rigidity, it is also more sensitive and can reduce energy waste.

　　4. High rigidity

　　Due to the large contact angle, it exhibits high rigidity. Appropriate preload can be applied as needed, thereby achieving higher torque stiffness and moment stiffness.

　　5. Simple assembly

　　Thanks to its special design, even if the splined outer sleeve comes loose from the splined shaft, the steel balls will not fall out. As a result, assembly, maintenance, and inspection are all very easy.