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Introduction of 5 kinds of damage states of FAG imported bearings

1 mechanical damage

Serious when in contact surface metal stripping and the scratch of the clutter of the large area, under normal circumstances, FAG import bearings mechanical damage is refers to the bearing alloy appearance to present different levels of grooves. Contact surface damage and ablation of the phenomenon of bearing mechanical damage caused by the main reason is that the appearance of FAG imported bearings is difficult to form oil film or oil film is seriously damaged.

2 bearing cavitation erosion

The outer layer of plastic deformation and cold work hardening, sliding FAG inlet bearing under the cylinder pressure impact load. Local loss of deformation capacity, and gradually form a pattern and continue to expand, and then with the debris of the shedding, the surface layer of the formation of the hole. General bearing the occurrence of cavitation, the first of the pit and the pit gradually expanded and cause cracking of alloy layer interface and crack propagation along the interface of parallel direction, until the peeling off so far. Bearing cavitation is the main reason is due to the cross section of the oil tank and the oil hole structure elements of the sudden change of oil flow caused by strong disturbance, the oil flow disorder vacuum bubble formation, then due to the increased pressure, the bubble collapse and cavitation. Cavitation occurs in high load FAG imported bearings, bearing down crankshaft FAG bearing imports.

3 fatigue pitting

Due to the overload of the engine, the FAG inlet bearing fatigue pitting is the. The bearing is overheated and the FAG inlet bearing clearance is too large, resulting in the middle of the bearing fatigue damage, fatigue pitting or fatigue. This damage is mostly because of overloading, F bearing clearance is too large, or not clean lubricating oil, which is mixed with foreign bodies. Therefore, when in use should pay attention to prevent imports fag bearing overload work not too low or too high speed running, idle to adjusted to the steady state of the engine, to ensure the normal imports fag bearing clearance, prevent the engine speed is too high or too low; check, adjust the cooling system to ensure optimum operating temperature of the engine.

4.FAG import bearing alloy corrosion

Lubricating oil in the chemical impurities (acidic oxides) the bearing alloy oxidation and produce acid and imports fag bearing alloy corrosion is generally area for lubricating oils impure. Causing the bearing alloy to local fall off, forming the rules of small holes or small pits. FAG import bearing alloy corrosion is the main reason for the improper selection of lubricating oil, FAG imports bearing material corrosion resistance is poor, or the engine is rough, the temperature is too high.

5FAG imported bearing burn and melt

Formed a local high temperature, the shaft neck and mouth bearing friction pairs have a small bump between the metal surface direct contact. Lack of lubrication, poor cooling conditions, the FAG bearing alloy black or partial melting. This fault is often caused by shaft and bearing too tight; lack of lubricating oil pressure is also easy to make FAG import bearings burned.