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Analysis: Reasons for damage to the engine sliding bearing
Source: Bearing network time: 2014-07-07
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As the international top-of-the-line bearing SKF bearing; it is widely used. Every occupation; its damage characteristics are also different. Today we look at the cause and characteristics of the damage of the engine sliding bearing.
(1) Mechanical damage The mechanical damage of the sliding bearing means that the alloy surface of the bearing bush exhibits a different degree of groove marks; in severe cases, the metal peeling occurs on the touch surface and a large area of ​​messy scratches is present, usually; the touch surface is damaged and burned. The eclipse appears together. The primary cause of the mechanical damage of the bearing is that the bearing surface is difficult to form an oil film or the oil film is severely damaged.
(2), the repeated effect of the bearing cavitation sliding bearing in the cylinder pressure impact load); the outer surface layer plastic deformation and cold work hardening; some loss deformation ability; gradually form the pattern and continue to expand; then follow the wear debris drop; The hole is formed on the outer surface of the load. Usually, when the bearing is cavitation, the pit is firstly formed; then the pit is gradually enlarged and causes cracking at the interface of the alloy layer; the crack expands along the parallel direction of the interface; until the drop stops. The primary cause of the cavitation of the sliding bearing is that the oil flow is fiercely disordered due to the cross-section of the layout elements such as the oil groove and the oil hole; the bubble is formed in the vacuum zone where the oil is lost; then the pressure is increased; the bubble collapses. Eclipse. Cavitation usually occurs in the high load zone of the bearing; such as the lower bearing of the main bearing of the crankshaft.
(3), fatigue pitting 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 is mostly because 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, adjust the engine to stability when idling Condition, to ensure normal bearing clearance; to avoid excessive or too low engine speed, to view and adjust the operation of the cooling system; to ensure the operating temperature of the engine is suitable. Flange ball valve (4), bearing alloy corrosion bearing alloy corrosion is usually the area Smooth oil is not pure; chemical impurities (acid oxides, etc.) in the smooth oil oxidize the bearing alloy to form acidic substances; cause some bearing alloys to fall; constitute irregular small holes or small pits. The primary reason is that the smooth oil is not properly selected, and the bearing data is poor in corrosion resistance; perhaps the engine is rough and the temperature is too high.
(5), there is a small convex metal surface between the bearing burning fuse journal and the bearing conflicting pair; the composition is somewhat high temperature; in the case of lack of smoothness and poor cooling; the bearing alloy is blackened or somewhat melted. This problem is often caused by the cooperation between the journal and the bearing. The lack of smooth oil pressure also makes the bearing burn down.
(6), bearing the outer circle bearing outer circle is the bearing has a relative transformation in the seat hole. After the bearing goes outside the circle; not only affects the heat dissipation of the bearing; simply makes the bearing inside and outside the bearing ablate; and also causes the bearing back surface damage; When the bearing is severe, the primary cause is that the bearing is too short, the crown is damaged, the processing may not meet the standard.
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