连杆小头衬套型线对其摩擦副润滑和变形特性的影响

Effect of Connecting Rod Small End Bushing Profiles on Lubrication and Deformation of Their Friction Pairs

基于弹流润滑(elastic hydrodynamic lubrication,EHL)和粗糙峰接触理论及平均流量模型,建立了某连杆小头摆动摩擦副柔性多体动力学模型,分析研究了抛物型线、双曲型线和锥度型线3种衬套型线对连杆小头摆动摩擦副润滑及变形匹配的影响。结果表明:抛物型线与双曲型线的润滑和变形特性都要优于无型线;而锥度型线润滑性能变差,变形特性能得到提升;综合来看,切削量为6μm的双曲型线对连杆小头衬套润滑和变形匹配的综合改善效果较好。

Based on the theory of elastic hydrodynamic lubrication and rough peak contact and the average flow model,a flexible multi-body dynamics model of the swinging friction pair of a connecting rod small end bushing was established,and the effect of the different profiles of the bushings,including parabolic,hyperbolic and tapered profiles,on lubrication and deformation of their swinging friction pairs was analyzed.Results show that compared with plain type bushing,the bushings with parabolic or hyperbolic profiles have better lubrication and deformation characteristics,while the bushing with a tapered profile has poor lubricity,but its deformation characteristics is better.In summary,use of hyperbolic profile with a cutting amount of 6 um can greatly improve the comprehensive characteristics of lubrication and deformation of the connecting rod small end bushings.