Optimal Design and Experimental Verification of Sealing Structure of Hub Bearing Units
In response to the problem of excessive friction torque generated by sealing structure of hub bearing units,it is proposed to improve the sealing material from fluororubber to nitrile rubber and reduce one contact lip in sealing structure.Through optimization,the optimal sealing intermediate lip parameters are obtained as lip inclination angle of 65°,lip thickness of 0.6 mm,lip length of 3.8 mm and interference fit of 0.35 mm.The units with improved seals are subjected to simulation analysis of sealing ring stress,grease leakage test and mud test,and verified by experiments.The results show that the bearing stress after optimization meets the allowable stress requirements of materials,and no grease leakage occurs.The moisture content in grease increases by less than 3%,and the starting and dynamic friction torque decreases by 24.3%and 22.1%,respectively,proving the reliability of optimized sealing structure.
rolling bearinghub bearing unitsealoptimal designfriction torquefinite element analysisexperiment
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