考虑滚子表面缺陷的滚动轴承动态微观润滑研究

doi:10.3901/JME.2018.07.131

摘要/Abstract

摘要： 滚动轴承中，滚子表面材料的剥落或是黏附会引起失效。为研究轴承滚子-套圈间的表面缺陷效应，基于缺陷滚子的有限长线接触问题，建立了动态微观弹流润滑模型，给出了表面凸起和凹坑两种点缺陷，分析了滚子表面缺陷对轴承润滑性能的影响，比较了缺陷滚子与内外圈接触时的润滑特性、时变解与准稳态解的差别，并讨论了缺陷尺寸和形状。结果显示，滚子的表面缺陷进入Hertz接触区，将显著影响润滑特性：凸起缺陷处油膜压力升高、油膜减薄，而凹坑缺陷处油膜压力和厚度均增大；当凸起缺陷位于出油口颈缩位置时，产生最大的油膜压力和最小的油膜厚度，润滑特性较差。与外圈的润滑特性不同，缺陷滚子与与内圈接触时油膜更薄，压力更高。与时变解相比，准稳态数值解油膜压力更低，而油膜更厚，在表面凸起位置尤甚，因此，不能用准稳态数值解代替时变解。研究同时表明：缺陷尺寸和形态对润滑性能影响显著。

关键词: 表面缺陷, 动态微观弹流润滑, 有限长线接触, 圆柱滚子

Abstract: In rolling bearings, the failure caused by spalling or adherent of rollers is common. To investigate the influence of the roller surface defect on the lubricating performance of roller-races contact elastohydrodynamic lubrication (EHL), a defect roller to races micro-EHL dynamic model is developed. Surface bump or dent, the two kinds of point defect are given, and effects of the two defects on the lubricating performance of bearings are analyzed. Comparison of the lubricating performance between a defect roller and inner or outer races is made. Differences between a quasi-steady state numerical solver and a time-dependent solver are provided. Effects of the dimension and shape of the defect on the lubricating performance are discussed. Results show that, the defect has obvious influence on the lubricating performance after it enters the Hertzian contact region, i.e., the pressure increases, and the film thickness decreases near the bump defect. But both the film pressure and thickness increase near the position of the dent defect. In addition, when the bump defect moves to the position of the film exit constriction, the lubricating condition becomes worse for the maximum pressure and minimum film thickness. In comparison with the roller to out race contact, the lubricating performance of a defect roller to inner race contact is worse. The pressure caused by the bump is underestimated, whereas the thickness is overestimated by the quasi-steady state solution. Therefore, it is not accurate if transient solver is replaced by the quasi-steady state solver. In addition, effects of the dimension and shape of defects on the lubricating performance are significant.

Key words: cylindrical roller, dynamic micro-elastohydrodynamic lubrication, finite line contact, surface defect

中图分类号:

TH117

刘晓玲, 杜肖, 杨沛然. 考虑滚子表面缺陷的滚动轴承动态微观润滑研究[J]. 机械工程学报, 2018, 54(7): 131-138.

LIU Xiaoling, DU Xiao, YANG Peiran. Study on Dynamic Micro-elastohydrodynamic Lubrication with Surface Defects of Rollers in Rolling Bearings[J]. Journal of Mechanical Engineering, 2018, 54(7): 131-138.

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