Four features of SKF sliding bearing damage in the engine

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Four features of SKF sliding bearing damage in the engine

Source: China Bearing Network Time: 2013-03-24

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1, SKF bearing cave erosion
Sliding bearing under the repeated effect of cylinder pressure impact load; surface layer plastic deformation and cold work hardening; some loss of deformation ability; gradually forming lines and expanding; then followed by the falling of wear debris; forming a hole in the loaded surface layer Usually, when the bearing is cavitation, the pit is first; then the pit is gradually enlarged and causes the interface of the alloy layer to crack; the crack expands along the parallel direction of the interface; until the drop stops. The primary cause of the sliding bearing cavitation Yes; because the cross-section of the oil-slot and oil hole and other layout elements have been changed to cause a fierce imbalance of oil flow; the bubble is formed in the vacuum zone where the oil is lost; then the pressure is increased; the bubble collapses and cavitation occurs. The high load zone of the bearing; such as the lower bearing of the main bearing of the crankshaft.
2, SKF bearing fatigue pitting <br> Bearing fatigue pitting refers to; because the engine is overloaded; the bearing operation is overheated and the bearing clearance is too large; the formation of the middle of the bearing fatigue damage, fatigue pitting may be tired and fall. This damage Mostly because of overload, bearing clearance is too large; perhaps smooth oil is not clean, mixed with foreign matter inside. Therefore; should pay attention to avoid bearing overload operation, do not operate at too low or too high speed, the engine should be idling Adjust to a stable condition to ensure normal bearing clearance; avoid excessive or too low engine speed, check and adjust the operation of the cooling system; ensure that the operating temperature of the engine is suitable.
3. SKF bearing alloy corrosion <br> Bearing alloy corrosion is usually a smooth oil impure; chemical impurities (acid oxides, etc.) in the smooth oil oxidize the bearing alloy to form an acidic substance; The formation of irregular small holes or small pits. The primary cause of corrosion of the bearing alloy is the improper selection of smooth oil, poor corrosion resistance of the bearing data; perhaps the engine is rough and the temperature is too high.
4, SKF bearing burning
There is a small convex metal surface directly touching between the journal and the bearing conflicting pair; it forms some high temperature; in the case of lack of smoothness and poor cooling; the bearing alloy is blackened or somewhat melted. This problem is often the journal and bearing. Due to the tight cooperation, the lack of smooth oil pressure also makes the bearing burned down.

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