弧面分度凸轮机构分度期润滑状态及油膜研究  

Study on Lubrication State and Oil Film of Globoidal Indexing Cam Mechanism During Indexing Period

作　　者：赵帅 尹明富[1] 朱洋 ZHAO Shuai;YIN Mingfu;ZHU Yang(School of Mechanical Engineering,Tianjin Polytechnic University,Tianjin 300387,China)

机构地区：[1]天津工业大学机械工程学院,天津300387

出　　处：《润滑与密封》2021年第7期108-113,共6页Lubrication Engineering

基　　金：天津市科委项目(14JCTPJC00536);天津市高等学校科技发展基金项目(20130402)。

摘　　要：以弧面分度凸轮机构为研究对象,研究弧面分度凸轮机构在分度期啮合过程中的润滑状态及产生的弹流润滑油膜厚度。利用空间包络面共轭原理和旋转变量法建立机构的数学模型,根据Hamrock-Dowson最小油膜计算公式,分析得出机构稳态工况下卷吸速度、诱导主曲率以及接触应力是影响润滑油膜形成的关键因素。通过空间共轭原理提出机构接触应力的新算法并进行可行性验证。对不同转速下机构的接触应力、油膜厚度和膜厚比进行仿真。结果表明,机构低速传动过程中,啮入段和啮出段极难形成弹流润滑油膜,为优化机构润滑性能提供了理论依据。Taking globoidal indexing cam mechanism as the research object,the lubrication state and elastohydrodynamic lubrication film thickness of globoidal indexing cam mechanism during indexing period meshing were studied.The mathematical model of the mechanism was established by using the conjugate principle of spatial envelope and the method of rotating variable.According to the Hamrock Dowson formula of minimum oil film,it was concluded that the entrainment speed,induced principal curvature and contact stress were the main factors influencing the formation of lubricating oil film thickness under steady state condition.Based on the principle of spatial conjugate,a new algorithm of contact stress was proposed and verified.The contact stress,oil film thickness and film thickness ratio of the mechanism at different speeds were simulated.The results show that it is very difficult to form elastohydrodynamic oil film in the meshing in and meshing out sections during the low speed transmission of the mechanism,which provides a theoretical basis for optimizing the lubrication performance of the mechanism.

关 键 词：弧面分度凸轮 弹流润滑油膜 接触应力 油膜厚度 膜厚比 

分 类 号：TH117.2[机械工程—机械设计及理论]