Lubrication Analysis of Oil-control-ring and Cylinder Liner Frictional Pair Considering Oil Feeding Condition

doi:10.3901/JME.2019.07.102

Abstract

Abstract: Most investigations on the lubrication of tribological interface between the oil-control-ring and the cylinder are based on the boundary condition of full lubrication condition or some certain one assumed. It does not meet well with the actuality of lubricant oil feeding. A 4-stroke IC engine is investigated to study the lubricant oil flowing and inlet feeding between the oil-control-ring and the cylinder. The oil film thickness of the inlet is determined. Based on this investigation, the flow equilibrium and the oil pressure equilibrium being guaranteed, boundary conditions are checked for each working surface. Lubrication parameters are analyzed for respective interface by resolving the Reynolds equation under the condition of actual inlet oil feeding. Research shows that, in the up-stroke, the lubrication performance of the frictional pair is asymmetrical with that in the down-stroke. As well as the maximum oil-film-pressure and the friction force and the friction power, the minimum oil-film-thickness has much difference with the one under full lubrication condition, especially in the up-stroke. Analysis of lubrication between the oil-control-ring and the cylinder, considering oil feeding condition, will benefit the reliability of design for the piston-cylinder frictional pair.

Key words: cylinder, internal combustion engine, lubricant oil feeding, lubrication, oil-control-ring

CLC Number:

TK402

LIU Guangsheng, SUN Jun, LI Biao, ZHU Shaoyu. Lubrication Analysis of Oil-control-ring and Cylinder Liner Frictional Pair Considering Oil Feeding Condition[J]. Journal of Mechanical Engineering, 2019, 55(7): 102-109.

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