粗糙表面对活塞混合润滑特性的影响  

Effects of Piston Rough Surface on Mixed Lubrication Characteristics

作　　者：杨振宇[1,2] 张卫正[1] 刘雨薇[1] 

机构地区：[1]北京理工大学机械与车辆学院,北京100081 [2]北汽福田汽车股份有限公司,北京102206

出　　处：《车用发动机》2014年第4期36-42,共7页Vehicle Engine

基　　金：国家"973"资助项目(613570303)

摘　　要：采用柔性多体系统动力学方法,建立了活塞的运动-变形-混合润滑的耦合模型,完整地表达了活塞的动力学和混合润滑特征。研究了活塞粗糙表面几何参数对混合润滑特性的影响。结果表明:随着粗糙程度的增大,最大接触应力有所减小,而流体摩擦损失有所增加;微凸体高度均值对接触有显著影响;微凸体高度的分散性在一定条件下对接触有明显影响。在活塞表面的摩擦学设计中,应选择适中的粗糙度,并且尽量降低微凸体高度均值和分散程度。Based on the flexible multi-body dynamics ,a coupling model of piston motion ,deformation and mixed lubrication was established ,which fully expressed the piston dynamics and mixed lubrication characteristics .The effects of piston rough surface geometry parameters on mixed lubrication characteristics were studied .The results show that the maximum contact pressure decreases and the fluid friction power loss increases with the increase of roughness .The average height of asperity and the scattering of asperity height have a great influence on contact pressure .Consequently ,it is essential to select a suitable roughness and to minimize the average height of asperity and its scattering degree as much as possible in the tribology design of piston surface .

关 键 词：活塞 柔体动力学 混合润滑 粗糙度 微凸体 

分 类 号：TK421.9[动力工程及工程热物理—动力机械及工程]