Study on Dynamic Micro-elastohydrodynamic Lubrication with Surface Defects of Rollers in Rolling Bearings

doi:10.3901/JME.2018.07.131

Abstract

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

CLC Number:

TH117

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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