The main reasons for the formation of side bearing faults are:
Insufficient design and installation of the bearing bush;
Overspeed, overload operation or impurities in the lubricating oil;
Under high temperature, high speed and high load operation, the journal and the bearing material thermally expand, the bearing clearance disappears, and the metal directly contacts;
Under the action of alternating load, the bearing surface produces reciprocating tensile stress, compressive stress and shear stress, so that fine cracks are generated on the bearing surface, and in the continuous operation state, fatigue fracture is finally formed;
Abortion caused by long-term operation at a large amplitude;
Sub-synchronization instability caused by misalignment of the coupling, improper operation, etc.