I. Structural Differences: Breakthroughs in Composite Motion Design
Spinning ball splines
Structure: It consists of a splined shaft, balls, splined sleeves and support bearings (of certain types). The outer diameter of the splined sleeve is integrated with the outer bearing sleeve to form a "rotary + linear" dual motion unit.
Motion: By rotating or stopping the cylinder, it causes rotational torque and linear displacement to be transferred simultaneously on one axis.
Ordinary linear ball splines
Structure composition: It consists only of a splined shaft, ball, and a splined sleeve. Linear motion is achieved by rolling the ball between the axle and the sleeve of the raceway.
Motion mode: Only unidirectional linear motion is supported,not direct transmission of rotary torque. If rotation function is required, additional couplings or gear sets are required.
II. Functional Advantages: Efficient integration compound movements.
Compound motor ability
The rotary ball spline simplifies the mechanical structure by realizing the double-mode movement of ``rotation + line"by means of a single axis.
Ordinary linear splines rely on multiaxial coupling or external transmission components to perform similar functions, increasing the complexity of system.
High precision, good rigidity;
The rotating ball spline is designed with a 40-degree contact angle and a large contact surface, greatly increasing the bearing capacity in both radial and torque directions.
The prepressure adjustment technology eliminates the gap in the direction of rotation, achieves zero gap transmission and ensures repeat positioning accuracy. For example, in CNC machine tools, rotary splines ensure precise positioning when the tool is replaced.
Low noise and long service life.
Rolling friction replaces sliding friction and reduces friction coefficient by more than 60%, minimizing energy loss and heat generation. For example, in medical imaging equipment, the low-noise nature of rotating splines optimizes the user experience.
The closed-loop structure prevents foreign objects from entering. Combined with high strength alloy steel and heat treatment process, the service life is 3-5 times longer.
Adapting to harsh working conditions
Rotating ball splines can withstand high frequency vibration, impact loads and high temperature environment.
Ordinary linear splines are prone to wear and displacement under heavy load or high speed working conditions and require constant maintenance.
