Thrust ball bearings are composed of three parts: seat ring, shaft ring and steel ball cage assembly. Cooperating with the shaft is called the shaft ring, and the cooperating with the shell is called the seat ring.

According to the force analysis, it is divided into one-way thrust ball bearings and two-way thrust ball bearings. One-way thrust ball bearings can bear one-way axial load. Two-way thrust ball bearings can withstand two-way axial loads, in which the shaft ring is matched with the shaft. The mounting surface of the seat ring is a spherical bearing, which has self-alignment performance and can reduce the influence of mounting errors. Thrust ball bearings cannot bear radial loads, and the limit speed is relatively low.

Although the installation operation of the thrust bearing is relatively simple, errors often occur in actual maintenance, that is, the installation position of the tight ring and loose ring bearing is not correct, resulting in the failure of the bearing and rapid wear of the journal. The tight ring is installed on the end face of a stationary part, that is, it is incorrectly assembled. The inner ring of the tight ring and the journal are in a transitional fit. When the shaft rotates, the tight ring is driven and friction occurs between the end face of the stationary part. When affected by the axial force, the torque generated by the friction will be greater than the matching resistance torque of the inner diameter. , resulting in the forced rotation of the tight ring and the shaft mating surface, which aggravates the wear of the journal.