Thermal Elastohydrodynamic Lubrication Analysis of Cylindrical Roller Bearing Considering Thermal Elastic Deformation and Surface Roughness

doi:10.3901/JME.2018.13.159

Abstract

Abstract: By considering the radial thermal elastic deformation and surface roughness of contact surface between roller and inner race of cylindrical roller bearing caused by lubricant temperature rise, a numerical method for analyzing line contact thermal elastohydrodynamic lubrication of cylindrical roller bearing is proposed based on the line contact thermal elastohydrodynamic lubrication theory. According to heat transfer of thermal elastic deformation, the material line thermal expansion coefficients of contact surface between roller and inner race are obtained, the radial thermal elastic deformation caused by lubricant temperature rise is modified. The oil film pressure, the oil film thickness, the oil film temperature rise and the radial thermal deformation are calculated by considering radial thermal elastic deformation and surface roughness. The effects of different loads, entrainment speeds and slide-to-roll ratios on the minimum oil film thickness, the maximum oil film pressure and the maximum lubricant temperature rise are studied. The results show that thermal elastic deformation and minimum oil film thickness are in the same order of magnitude, thermal elastic deformation and surface roughness have profound influences on lubrication performance.

Key words: cylindrical roller bearing, surface roughness, thermal elastic deformation, thermal elastohydrodynamic lubrication

CLC Number:

TH133

LU Zunyou, LÜ Yanjun, LI Sha, ZHANG Wei, DANG Chao, YU Na, YANG Jie. Thermal Elastohydrodynamic Lubrication Analysis of Cylindrical Roller Bearing Considering Thermal Elastic Deformation and Surface Roughness[J]. Journal of Mechanical Engineering, 2018, 54(13): 159-169.

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