Peeling Damaged state: When the bearing rotates under load again, the raceway surface or rolling element surface of the inner ring and the outer ring presents a fish-scale peeling phenomenon due to rolling fatigue. Reason: The load is too large. Improper installation (non-linear) moment load foreign matter intrusion, water ingress. Poor lubrication, inappropriate lubricant Inappropriate bearing clearance. The bearing housing has poor accuracy, the rigidity of the bearing housing is uneven, the deflection of the shaft is large, and the development is caused by rust, erosion points, scratches and indentations (surface deformation phenomena). Measures: Check the size of the load and re-study the bearings used to improve the installation method, improve the sealing device, and prevent rust during shutdown. Use lubricants of appropriate viscosity and improve lubrication methods. Check the accuracy of the shaft and bearing housing. Check clearance. Peeling damage state: showing a dark side with slight wear, and there are many tiny cracks as deep as 5-10m from the surface on the dark side, and tiny peeling (micro peeling) occurs in a large area. Reason: the lubricant is not Suitable. Foreign matter has entered the lubricant. Poor lubricant causes rough surface. The surface finish of the paired rolling parts is not good. Measures: Select lubricants to improve the sealing device to improve the surface finish of the paired rolling parts. Jamming Damage state: The so-called jamming is the surface damage caused by the aggregation of micro burns in the part of the sliding surface damage. Linear flaws in the circumferential direction of the sliding surface and the rolling surface. The trochoidal flaw on the roller end face is close to the jamming on the collar face of the roller end face. Reason: Excessive load, excessive preload. Poor lubrication. Foreign body bites. The inclination of the inner ring and the outer ring, and the deflection of the shaft. The accuracy of the shaft and bearing housing is poor. Action: Check the size of the load. Preload should be appropriate. Improve lubricants and lubrication methods. Check the accuracy of the shaft and bearing housing. Fracture Damage state: The so-called fracture refers to a small part of the fracture due to the impact or excessive load applied to the local part of the rib or roller corner of the raceway wheel. Cause: It was hit during installation. The load is too high. Poor use such as falling. Action: Improve the installation method (use shrink-fit, use appropriate tool clips). Correct load conditions. The bearings are in place so that the ribs are supported. Cracks, cracks Damage state: The so-called cracks refer to cracks in the raceway wheel or rolling elements. If continued use will also include crack growth cracks. Reason: Excessive interference. Excessive load, shock load. Stripping has developed. Heat generation and fretting wear due to the contact of the raceway wheel with the mounting member. Heating caused by creep. The taper angle of the taper shaft is poor. The cylindricity of the shaft is poor. The fillet radius of the shaft step is larger than that of the bearing chamfer, causing interference with the bearing chamfer. Measures: The amount of interference is appropriate. Check load conditions. Improve installation method. The shape of the shaft should be appropriate.