Abstract

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Title:: Experiment on influence of impurity particles on wheel hub bearing grease

Author(s):: PENG Chao-lin; XIE Xiao-peng; LI Guang-le; LI Xing-lin; (1.Schoolof Automobile, Chang’an University, Xi’an 710064, Shaanxi, China; 2. Hangzhou Bearing Test & Research Center (HBRC), Hangzhou 310022, Zhejiang, China; 3. School of Mechanical and Automobile Engineering, South China University of Technology, Guangzhou 510640, Guangdong, China)

Keywords:: mechanical engineering; wheel hub bearing; impurity particle; failure mechanism; experimental study

Abstract:: In order to research on the origin of impurity particle sand the influences of grease mixed with these particles on the performance of automobile wheel hub bearings, this paper analyzed element contents and distribution of particles size in failure wheel hub bearing grease by using MOA-Ⅱ emission spectrometer and particle counter. Cu and SiO2 submicron particles with different mass fractions and diameters were added into lithium complex grease. Based on that, influences of submicron particles on lubrication performance for testing grease were tested by using four-ball test rig. The results show that the reasons for debris particles emergence mainly contain external invade and self-generated in bearing surface. The diameter and number of debris particles have a exponential function relation in which the number of particles increases with the decrease of as the diameter of particle more smaller. Within the scope of selected particles diameter, after adding SiO2 and Cu with different mass fractions respectively, the friction coefficient increases at first then decreases with the increase of particles size, but the increase degree of friction is different from that of the base grease.