凸轮机构混合弹流润滑特性分析  

Analysis of Mixed EHL Characteristics of Cam Mechanisms

作　　者：杨福芹[1] 姜敬伟 YANG Fuqin;JIANG Jingwei(School of Mechanoelectrical Engineering,Qingdao University of Science and Technology,Qingdao Shandong 266061,China)

机构地区：[1]青岛科技大学机电工程学院

出　　处：《润滑与密封》2019年第11期39-44,共6页Lubrication Engineering

基　　金：山东省重点研发计划项目(2018GGX103015)

摘　　要：针对凸轮机构在混合弹流润滑状态下容易过早形成胶合和磨损等问题,对处于混合弹流润滑状态下的凸轮机构润滑特性进行研究。基于载荷分担思想,联立凸轮机构参数方程和弹流润滑理论方程,采用数值解法对凸轮机构推程中的摩擦因数、膜厚和油膜承载占比进行求解,得到6种运动规律凸轮机构的摩擦因数、膜厚和油膜承载占比随凸轮转动的变化曲线,并探究基圆半径、当量弹性模量和转速对凸轮机构混合润滑特性的影响。研究结果表明:增大基圆半径和转速有利于降低推程中的摩擦因数,且使膜厚和油膜承载占比增大,从而有利于改善润滑状况;增大当量弹性模量对推程膜厚影响不大,但会增大摩擦因数,使油膜承载占比减小,从而不利于润滑状况的改善。Aimed at the problems of premature gluing and wear of cam mechanisms under mixed elastohydrodynamic lubrication(EHL),the lubrication characteristics of cam tappet pairs under mixed EHL were studied.Based on the idea of load sharing,the parameter equations of cam mechanisms and the theory of EHL were combined,the friction coefficient,film thickness and load bearing ratio of oil film in the pushing course of cam mechanisms were solved by numerical method.The curves of friction coefficient,film thickness and load bearing ratio of oil film of cam mechanisms varying with cam rotation of six motion laws were obtained,and the effects of radius of base circle,equivalent modulus of elasticity and rotating speed on the lubrication characteristics of cam mechanisms were studied.The results indicate that increasing the radius of the base circle and rotating speed is beneficial to reducing the friction coefficient in the pushing course,and increasing the film thickness and the load bearing ratio of the oil film,which is beneficial to improving the lubrication condition.Increasing the equivalent modulus of elasticity has little effect on the film thickness in the pushing course,but it will increase the friction coefficient and reduce the load bearing ratio of oil film,which is not conducive to the improvement of lubrication condition.

关 键 词：凸轮机构 载荷分担 混合润滑 摩擦因数 承载占比 

分 类 号：TH132[机械工程—机械制造及自动化]