修形滚针的有限长线接触弹流润滑性能  

Finite Line Contact EHL of Profiled Needle Roller

作　　者：沈雪瑾[1] 吕琦[1] 吴文蕾[1] 

机构地区：[1]上海大学机械自动化系,上海200072

出　　处：《轴承》2009年第2期23-27,共5页Bearing

基　　金：上海汽车工业科技发展基金项目(0320);NSK-EMTAF基金项目

摘　　要：运用多重网格法求解出大长径比(滚针长度与直径之比)的滚针有限长线接触热弹流的数值解,分析最大长径比达6∶1的滚针弹流问题,在最大Hertz接触压力pH为2.0 GPa的情况下,滚针干接触时的接触区域长度与宽度之比k高达169.5,计算收敛解的最小卷吸速度ue为0.3 m/s。据此探讨了稳态工况下载荷与速度的变化对滚针油膜厚度和接触压力分布的影响,并针对长径比对滚针弹流特性的影响进行了分析。结果表明:当滚针半径一定时,长径比越大,滚针端部的压力变得越大,且承受载荷的范围也越大。The finite line contact EHL numerical solution of profiled needle miler at a large length/diameter ratio is gained. The maximal ratio of Hertz half - contact width and contact half- length reach 169.5, when the Hertz contact pressure is 2.0 GPa and the length/diameter ratio is 6： 1. The minimal entrainment velocity comes to 0.3 m/s for the 6：1 length/diameter ratio. The influences of load and velocity parameters on the off film thickness and pressure distribution are illustrated under steady working conditions, and the influences of the length/diameter ratio on EHL characteristic of the needle roller are also studied, which show high length/diameter ratio will enlarge the pressure at the end of the needle roller and the contact area.

关 键 词：滚针轴承 修形滚针 弹流润滑 长径比 

分 类 号：TH133.333[机械工程—机械制造及自动化] TH117.2