内燃机凸轮-滚轮型接触副弹流润滑分析  

Elastohydrodynamic Lubrication Analysis of a Cam-roller Pair of an Internal Combustion Engine

作　　者：朱建荣 李书义 郭晓龙 郭灵燕 郭峰 ZHU Jianrong;LI Shuyi;GUO Xiaolong;GUO Lingyan;GUO Feng(Weichai Power Co.,Ltd.,Weifang Shandong 261041,China;School of Mechanical and Automotive Engineering,Qingdao University of Technology,Qingdao Shandong 266300,China)

机构地区：[1]潍柴动力股份有限公司,山东潍坊261041 [2]青岛理工大学机械与汽车工程学院,山东青岛266300

出　　处：《润滑与密封》2020年第11期83-90,96,共9页Lubrication Engineering

基　　金：潍柴动力股份有限公司内燃机可靠性国家重点实验室开放课题(skler-201704).

摘　　要：基于某内燃机凸轮-滚轮型机构,建立相应的接触副弹流润滑数值模型,得到凸轮旋转周期内运动副的完整润滑状态,并分析滚轮凸度、润滑油黏度及凸轮-滚轮间打滑现象的影响。结果表明:一个周期内,凸轮-滚轮接触副的润滑状态可分为波动期和平稳期,与凸轮升程的改变规律相对应;滚轮凸度会影响接触副的润滑状态,且接触区压力分布对其十分敏感;提高润滑油黏度在一定程度上可以起到优化接触区压力分布,改善润滑状态的效果;凸轮-滚轮间打滑现象则会降低接触区成膜厚度,尤其是对润滑油温升和摩擦因数的影响更为显著。Based on a cam-roller mechanism of an internal combustion engine,the corresponding numerical model of elastohydrodynamic lubrication was established,and the lubrication state during the rotating cycle of the cam was obtained.The influence of the roller convexity,the oil viscosity and the slipping between the cam and the roller was analyzed.The results show that the lubrication state of the cam-roller contact can be divided into fluctuation period and stationary period,which correspond to the changing law of cam lift.The roller convexity can affect the lubrication state of the contact pair,and the pressure distribution in the contact zone is very sensitive to it.To some extent,increasing the viscosity of the oil can optimize the pressure distribution in the contact zone and improve the lubrication state.However,the slipping phenomenon of the cam and the roller can reduce the film thickness of the contact zone,especially the influence on the temperature rise and friction coefficient of lubricating oil is more significant.

关 键 词：内燃机 凸轮 弹流润滑 凸度 打滑 

分 类 号：TH117.2[机械工程—机械设计及理论]