What are the advantages of four-point contact ball bearings in practical applications?

1. High load and multi-directional load adaptability
The four-point contact ball bearing uses a peach-shaped cross-section design of the raceway to form four-point contact between the steel ball and the raceway (two inner points and two outer points), which can simultaneously withstand bidirectional axial forces and certain radial forces. This feature is particularly important when high-speed motors frequently start and stop or change direction, and can effectively cope with alternating axial impacts. In precision instruments, four-point contact ball bearings can simultaneously handle composite loads of radial, axial and overturning moments, such as the superposition of centrifugal force and cutting force generated by the spindle of a machine tool when rotating at high speed. Its uniform load distribution (optimized at a contact angle of 35°) reduces local stress concentration and extends service life.

2. High performance and low friction characteristics
The use of lightweight brass cages or ceramic balls (such as hybrid ceramic bearings) can reduce centrifugal force and friction heat. The four-point contact design reduces the friction contact area between the steel ball and the cage by optimizing the raceway curvature, reducing the friction coefficient by more than 30%, ensuring that the temperature is stable within 110°C during high-speed operation.

3. Optimization of high precision and noise
The four-point contact ball bearing realizes the function of a double-row bearing with a single-row structure, and the axial size is reduced by 30%-50%. The P5/P6 tolerance of the four-point contact ball bearing can meet the requirements of semiconductor equipment and optical instruments for motion accuracy. Through the raceway shaping and cage dynamic balancing technology, the noise index of the four-point contact ball bearing is 15dB lower than that of ordinary bearings during high-speed operation.