On the Piston Secondary Motion of Piston and Lubrication of Piston Skirt at Different Operating Conditions

doi:10.3901/JME.2019.10.175

Abstract

Abstract: Current research on the piston secondary motion and the lubrication of piston skirt-cylinder liner friction conjunction for internal combustion engine is generally carried out in rated operating condition, and the constant change of operating condition for actual used internal combustion engine is not considered. In addition, the piston skirt-cylinder liner friction conjunction is usually supposed to be lubricated sufficiently in all strokes of an operating cycle of internal combustion engine in current analysis. A four-stroke internal combustion engine is taken as the studying object, based on measured cylinder pressure, the piston secondary motion and the lubrication of piston skirt-cylinder liner friction conjunction considering the lubrication status determined by the actual flow of lubricating oil in different operating conditions of internal combustion engine are analyzed. The results show that there are the differences of the piston secondary motion and the lubricating characteristics of piston skirt-cylinder liner friction conjunction in different operating conditions, and the worst condition may not be in rated operating condition. Therefore, it is not comprehensive and reasonable that the piston secondary motion and the lubrication of piston skirt-cylinder liner friction conjunction are analyzed only in rated operating condition, and it is necessary to calculate the piston secondary motion and the lubrication of piston skirt-cylinder liner friction conjunction in different operating conditions in the design of piston set.

Key words: load-carrying capacity, computational fluid dynamics（CFD）, friction coefficient, neural network, surface tension, surface texture, IC engine, lubrication, operating condition, piston, piston skirt, secondary motion

CLC Number:

TK40

SUN Jun, ZHU Jianxiong, LIU Guangsheng, HUANG Xiang, LI Biao, ZHU Shaoyu, MIAO Enming, HAO Feifei, HU Xinliang, LI Yue. On the Piston Secondary Motion of Piston and Lubrication of Piston Skirt at Different Operating Conditions[J]. Journal of Mechanical Engineering, 2019, 55(10): 175-184.

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