For radial bearing inner ring and shaft, usually a tight fit, and work together with the shaft, the outer ring is usually associated with bearings or mechanical shell holes into the transition fit, play supporting role. However, in certain situations, there are outer operation, the inner ring is fixed play supporting role or the inner ring, outer ring are run at the same time.
Thrust bearing, motor and shaft tightly combined together called the axis ring, a transition fit and called the ring support effect and the bearing or machine casing hole. Roller (ball, roller or needle roller bearing) is usually used in the cage are evenly arranged for rolling motion between two rings, shape, size and number of its direct impact on the load capacity and the bearing performance.
The holder can be evenly spaced rolling body, can guide the rolling rotation and improve the lubrication performance of bearing etc..