对数修形圆锥滚子的弹流润滑分析  

Elastohydrodynamic Lubrication of Tapered Roller with Logarithmic Profile

作　　者：陈芳华[1] 汪久根[2] 张根源[3] 

机构地区：[1]杭州轴承试验研究中心有限公司,杭州310022 [2]浙江大学机械工程学系,杭州310027 [3]浙江传媒学院电子信息学院,杭州310018

出　　处：《机械工程学报》2011年第19期143-148,共6页Journal of Mechanical Engineering

基　　金：教育部博士学科点专项科研基金(J20081235);浙江省自然科学基金(Z1100475;Y1080379)资助项目

摘　　要：考虑接触体表面的弹性变形效应与润滑剂的压粘效应,建立圆锥滚子轴承的弹性流体动力润滑模型;并进行了完全数值解分析,得到了流体动压力分布、油膜形状与表面层内Mises应力分布。分析了对数修形圆锥滚子的弹流润滑特性。结果表明,直母线的圆锥滚子的弹流压力分布在滚子两端存在压力峰,并在滚子表层有应力集中现象;而对数母线的滚子在两端区域没有很高的压力峰和应力集中。滚子大端的流体动压力较高,而滚子的小端压力较低;在滚子的两端区域存在较小的油膜厚度,而且滚子小端的油膜厚度更薄;对数修形的圆锥滚子的最小油膜厚度增大,而中心油膜厚度减小;总体上对数修形滚子的弹流润滑状态得到改善。With the consideration of the elastic deformation of the two surfaces under contact and the piezo-viscous effect of lubricants,the lubrication model for tapered roller bearings is established,and the elastohydrodynamic（EHD） lubrication processes are fully numerically analyzed and obtain the film shape and the pressure distribution,and Mises stress field in subsurface layer.The EHD features of logarithmic tapered roller are studied.The results seem that high hydrodynamic pressure exists at the two end zones of the roller and the hydrodynamic pressure at the large end is higher than that of the small end,and stress concentration occurs inside the subsurface at the roller ends;however,the rollers with logarithmic profile do not have high pressure and stress concentration phenomenon at the ends.The zones of minimum film thickness appear at the two ends,and a thinner film at the small end.For logarithmic tapered roller compared with straight profile tapered roller,the minimum film thickness is thicker,and the central film thickness is thinner,the EHD lubrication of such tapered rollers is generally better than that of straight profile.

关 键 词：圆锥滚子 弹性压粘度区 油膜厚度 压力分布 Mises应力场 

分 类 号：TH117[机械工程—机械设计及理论]