Abstract:The mathematical model of the thermal elastohydrodynamic lubrication (TEHL) for angular contact ball bearing was establishedThrough solving the Reynolds equation considering thermal effect,a full numerical solution of the lubricated angular ball bearing was acquired by considering thermal effect and surface roughnessIn the absence of measured data,the effect of surface roughness on thermal elastohydrodynamic lubrication of angular contact ball bearing was analyzed by adopting the rough cosine wave mathematic model involving the surface of bearing rollaway and rolling sphereResults show that the roughness function considering x and y direction roughness can better simulate the morphology features of bearing rollaway and rolling sphere,the calculated pressure and film thickness is more closer to the engineering practiceAfter considering the roughness of two directions,the distribution of pressure and film thickness is different from single direction roughnessThe pressure becomes smaller and film thickness becomes thicker,and the lubrication condition is improved when increasing the wavelength and decreasing the amplitude of the roughness.