关键词: 有机钼, 多元醇酯, 轮毂轴承, 润滑脂, 摩擦磨损

Abstract: In order to further improve the tribological performance of polyurea greases for hub bearing of electric vehicles, a multi-functional friction and wear tester and a self-designed rolling bearing friction test-bed were used,the effects of organic molybdenum 855 and polyol ester 3970 on the tribological performance of commercial polyurea greases were investigated under pure sliding conditions and actual bearing operation conditions respectively, and the wear surface morphology and surface roughness of the test steel balls were characterized by microscope, scanning electron microscope, and 3D white-light interferometer. The results showed that the antifriction and anti-wear performance of commercial polyurea grease could not be improved byadding organic molybdenum 855 alone, but polyol ester 3970 alone and the combination of them could be used.In particular,the tribological performance of polyurea grease with (855+3970) could be significantly improved under various bearing operating conditions.The friction coefficient of polyurea grease with (855+3970) was reduced by more than 20%, and the largest decrease was38.8%.

Key words: organic molybdenum, polyol ester, wheel bearings, grease, friction and wear