Generally speaking, the proper use of the bearing, can reach the fatigue life. But if the early injury accident, can not be used. Unlike the fatigue life, the early damage, is called a fault or accident. More due to installation, use, lubrication of the ill-considered, the intrusion of foreign bodies from external or for shaft, bearing the insufficient study on. Bearing damage such as scratches roller bearing rings of ribs, the reason may be the lack of lubricant, grades don't fit, for oil discharge structure with flexure defect, foreign intrusion, SKF bearings installation error or shaft is too large, there may be various reasons caused above.
Therefore, only the investigation of bearing damage, it is difficult to know the real causes of injury. However, if in the full understanding of basic machine, working condition and its peripheral structure using bearing on, find fault and status, and then analyses the damage and the various causes of FAG bearings, can prevent the similar fault again. Reason of bearing damage and Countermeasures of representative.
1 mechanical injury
Serious when in contact surface of a metal strip and a large random scratch; in general, the cylindrical roller bearing is a bearing alloy mechanical damage appearance appear different level furrow. The contact surface damage and erosion phenomena also exists mainly caused by mechanical damage of NSK bearings are bearings looks difficult to form oil film or destroyed.
2 bearing cavitation
Outer layer of plastic deformation and cold hardening, sliding bearing in cylinder pressure) subjected to repeated impact load. Partial loss of deformability, gradually formed the pattern and expanded, and then with the shedding of debris, loading surface layer formed cave. General bearing the occurrence of cavitation, the first pit, and the pit gradually expand and cause the alloy layer interface crack, crack parallel to the interface extension, until such time as peeling. The main reason for bearing cavitation is due to cross-sectional oil tank and oil hole and the structural elements of the sudden change of oil flow caused by strong disturbance, vacuum oil flow disorder bubble formation, then the pressure increased, and cavitation bubble collapse. Ana generally occurs at high load TIMKEN bearings, such as bearing of crankshaft main bearing.
3 fatigue pitting
As the engine work overload, fatigue pitting cylindrical roller bearing is. The Swedish Bearing Overheating and 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 body in. 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 the steady state; to 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 alloy corrosion
Chemical impurities in the lubricating oil of the station (acidic oxides) bearing alloy oxidation produce acidic substances, bearing alloy corrosion is generally for lubricating oil impure. INA bearings alloys caused partial loss, forming irregular small holes or small pits. The main causes of bearing alloy corrosion is the improper selection of bearing materials of lubricating oil, poor corrosion resistance, or engine harshness, temperature too high.
5 burning of bearing
The formation of local high temperature, between shaft and bearing friction is convex metal surface micro direct contact. Lack of lubrication, cooling the adverse circumstances, make the bearing alloys blackening or partial melting. This fault is often caused by shaft and bearing too tight; lack of lubricating oil pressure is also easy to make bearing burned.



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