The clutch release bearing is a more important part of the car. If the maintenance is not good, the failure will not only cause economic losses, but also will be very troublesome to disassemble and install, and it will take a lot of man-hours. Clutch release bearings have evolved from low-speed units with no self-aligning performance, outer ring rotation, cast iron sleeves, or inner ring and sleeve integration, to self-aligning performance, inner ring rotation, stamped ferrules and stamped sleeves or The high-speed, high-reliability bearing unit of the plastic sleeve reduces weight and costs, and realizes componentization, weight reduction, high reliability and long life.