TRW bearing is a kind of precise mechanical component which changes the sliding friction between the running shaft and the shaft seat into rolling friction, so as to reduce the friction loss. TRW bearing  is generally composed of inner ring, outer ring, rolling body and cage. The inner ring is used to match the shaft and rotate with the shaft. The outer ring is used to match the bearing seat and play a supporting role. The rolling body distributes the rolling body evenly between the inner ring and the outer ring with the help of the cage. Its shape, size and quantity directly affect the service performance and service life of the rolling bearing; The cage can make the rolling body evenly distributed and guide the rolling body to rotate and lubricate.