1. The working principle of bearings is rolling friction instead of sliding friction;

 

2. Because all kinds of machinery have different working conditions, rolling bearings in load capacity, structure and performance have put forward a variety of different requirements, therefore, rolling bearings need a variety of structures;

 

3. Bearing usually with the help of cage evenly arranged between the two rings for rolling motion, its shape, size and number directly affect the bearing load capacity and performance, cage in addition to the rolling body evenly separated, can also guide the rotation of the rolling body and improve the bearing internal lubrication performance.