1 mechanical injury
Serious when in contact with the surface of the metal strip and a large area of messy scratching; in general, the bearing mechanical damage means bearing alloy appearance appear different level furrow. The contact surface damage and erosion phenomena also exists mainly caused by Advantage and disadvantage of cold rolling bearing mechanical damage is bearing surface to form oil film or destroyed.
2 bearing cavitation
Outer layer of plastic deformation and cold work hardening, sliding bearing in cylinder pressure under repeated impact load). Partial loss of deformability, gradually formed the pattern and expanded, and then with the falling debris, loading surface layer formed cave. General bearing the occurrence of cavitation, the first pit, and the pit gradually expand and cause cracking of alloy layer interface, crack along the interface of Advantage and disadvantage of cold rolling parallel direction extension, until such time as peeling. The main reason for bearing cavitation is caused by strong disturbance oil flow sudden change of cross-sectional oil groove and hole structure elements, vacuum oil flow disorder bubble formation, then the pressure increased, resulting from cavitation bubble collapse. Cavitation occurs in the high area of the bearing, such as crankshaft main bearings on the bearing down.

3 fatigue pitting
Because the engine work overload, bearing fatigue pitting refers to. The overheating and bearing bearing clearance is too large, resulting in a central bearing fatigue damage, fatigue pitting or fatigue loss. This damage is mostly because of overloading, the bearing clearance is too large, or lubricating oil is not clean, which is mixed with foreign bodies. Therefore, when in use should pay attention to prevent the bearing overload work not too low or too high speed running; idle speed to adjust the engine to a steady state; to Advantage and disadvantage of cold rolling ensure the bearing clearance is normal, prevent the engine speed is too high or too low; check operation, adjust the cooling system, make sure the engine operating temperature appropriate.
4 bearing alloys
Chemical impurities in lubricating oil station (acidic oxides) bearing alloy oxidation produce acidic substances, bearing alloy corrosion is generally for lubricating oil impure. Partial loss caused by bearing alloy, forming small holes or small pits without rules. The main reason for bearing alloy corrosion is the improper selection of Advantage and disadvantage of cold rolling lubricating oil bearing materials, corrosion resistance is poor, or the engine harshness, temperature too high.
5 burning of bearing
The formation of local high temperature, between shaft and bearing friction pair with a convex metal surface micro direct contact. Lack of lubrication, cooling the adverse circumstances, make the bearing alloys blackening or partial melting. This failure is often the axle neck and bearing with lubricating oil pressure caused by tight; the lack of it is easy to burn out of bearing.