Thrust ball bearing composition: The thrust ball bearing is composed of three parts: seat ring, shaft ring, and steel ball cage component. The shaft ring that fits with the shaft and the seat ring that fits with the shell. According to the force situation, it is divided into unidirectional thrust ball bearings and bidirectional thrust ball bearings. Unidirectional thrust ball bearings can withstand unidirectional axial loads. Bidirectional thrust ball bearings can withstand bidirectional axial loads, where the shaft ring fits with the shaft. The bearing with a spherical installation surface of the seat ring has centering performance, which can reduce the impact of installation errors. The thrust ball bearing cannot withstand radial loads and has a lower limit speed. The thrust ball bearing adopts a design that can withstand thrust loads during high-speed operation, and is composed of a washer like ring with a ball rolling raceway groove. Due to the cushion shaped collar, thrust ball bearings are divided into two types: flat bottom cushion type and self-aligning spherical cushion type. In addition, this type of bearing can withstand axial loads, but cannot withstand radial loads.