有机钼和多元醇酯对轮毂轴承聚脲润滑脂摩擦性能的影响

EFFECT OF ORGANIC MOLYBDENUM AND POLYOL ESTER ON FRICTION PERFORMANCE OF POLYUREA GREASE FOR HUB BEARINGS

为了进一步提升电动汽车用轮毂轴承聚脲润滑脂的摩擦学性能,利用多功能摩擦磨损试验机和自主设计搭建的滚动轴承摩擦测量试验台,分别在纯滑动工况和实际轴承运行工况下考察了有机钼855和多元醇酯3970对商用聚脲润滑脂摩擦学性能的影响,并利用显微镜、扫描电子显微镜和三维白光干涉仪表征了试验钢球磨损表面的形貌和表面粗糙度。结果表明:单独添加有机钼855并不能明显改善商用聚脲润滑脂的减摩抗磨性能;而单独添加多元醇酯3970以及二者复配使用,均可明显提升聚脲润滑脂的承载能力、减摩性能和抗磨性能;特别是二者复配使用时聚脲润滑脂的摩擦学性能显著改善,在多种轴承实际运行工况下,添加(855+3970)的聚脲润滑脂样品的摩擦因数降幅均超过20%,最大降幅达38.8%。

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 by adding 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 was 38.8%.