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Is a kind of thin wall bearing bushing type, shape of tiles commonly known as bearing shell;The other is a liner, is also called copper sets, for hollow cylinder shape.Bushing type is mainly used for thin wall bearing retainer engine crankshaft and connecting rod;Bushing is mainly used for bearing CAM shaft neck and piston pins.This article main narration is bushing type thin wall bearing (bearing). 1, the form of the early damageBearing in the process of normal use, due to the gradual wear and tear until the end of the last loss of working ability, its service life, the natural damage is difficult to avoid.But if an engine assembly improper adjustment, lubricating oil quality is bad or use conditions and other factors caused the bearing wear or prematurely appear all sorts of injury, early damage is man-made.Early damage not only greatly reduce the service life of bearing, at the same time also can affect the normal work of the engine.According to the maintenance experience of diesel engine is found for a long time, the common form of early damage of the sliding bearing has a mechanical damage, bearing hole corrosion, pitting corrosion fatigue, corrosion, etc. (1), the mechanical damageSliding bearing mechanical damage refers to bearing alloy surface appear different degree of the trench, serious when in contact with the surface of metal strip and a massive disorderly cut;Under normal circumstances, the contact surface damage and ablation phenomenon exist at the same time.Bearing mechanical damage is the main reason of the difficult to form the oil film bearing surface or oil film were severely damaged. (2), bearing the cavitationSliding bearing in cylinder pressure under the action of repeated impact load, surface plastic deformation and cold work hardening, local loss of deformation ability, gradually form stripe and expanded, and then with the shedding of wear debris, formed in the loading surface layer recesses.The cavitation, general bearing shell pits is first appeared, and then gradually expand the pits of the interface crack, and lead to an alloy layer along the interface crack parallel to the direction of extension, until it is peeling off.Sliding bearing is the main reason of the cavitation, due to structural elements such as oil groove and oil hole of the cross sectional sudden change flow caused by strong disturbance, in the vacuum area of the flow disorder form bubbles, then because of the pressure, generate cavitation bubble breaking.Cavitation occurs commonly in high load bearing, such as the crankshaft main bearing on the lower bearing.