Thrust bearing are divided into thrust ball bearing and thrust roller bearing. Thrust ball bearing are also divided into thrust ball bearing and thrust angular contact ball bearing. Raceway rings with raceway washers and ball and cage components are called axle rings, and raceway rings with outer shell are called seat rings. Two-way bearing match the middle ring with the shaft. One-way bearing can bear unidirectional axial load, and two-way bearing can bear unidirectional axial load. Two-way axial load. bearing with spherical mounting surface of seat ring have alignment performance, which can reduce the influence of installation error. These bearing are mainly used in automobile steering mechanism and machine tool spindle. Thrust roller bearing are divided into thrust cylindrical roller bearing, thrust aligning roller bearing, thrust tapered roller bearing and thrust needle bearing. Thrust cylindrical roller bearing are mainly used in oil drilling rigs and iron-making steel. Machinery. Thrust aligning roller bearing are mainly used in hydroelectric generators, vertical motors, marine propeller shafts, tower cranes, extruders and so on. Thrust tapered roller bearing are mainly used in unidirectional: crane hooks, oil rig rings, bidirectional: rolling mill roll neck. Planar thrust bearing mainly bear axial loads in the assembly body and are widely used. Although the installation and operation of thrust bearing are relatively simple, there are still errors in actual maintenance, that is, the installation position of the tight and loose rings of bearing is incorrect, resulting in the loss of function of bearing, and the journal is quickly worn out. The tightening ring is installed on the end face of the stationary part, i.e. incorrect assembly. The inner ring of the tightening ring is in transition with the journal. When the shaft rotates, it drives the tightening ring and rubs against the end face of the stationary part. When it is subjected to the axial force (Fx), the friction moment will be greater than the resistance moment of the inner diameter matching, which will result in the forced rotation of the tightening ring and the axle mating surface and aggravate the wear of the journal.