Theoretical and Experimental Studies on the Influence of Lubricating Film on Dynamic Characteristics of Spindle Bearing

Abstract

In this paper, an optimized bearing quasi-static model was established by coupling the influence factors of lubricating oil between ball and raceway, the interaction between cage and ball, and the fluid dynamic pressure distribution pressure of oil film between cage and guide ring with the consideration of the effects of cage and lubricating oil. Compared with Jone’s classical quasi-statics model simulation results and test results, the bearing mechanics model established in this paper is more accurate and feasible. On the basis of such model, the dynamic characteristic parameters of the oil film condition between ball and raceway and the force acting on cage, were analyzed for different working conditions. Results show that the oil film thickness of ball-raceway is more sensitive to the bearing rotating speed greater than the loads. With the increasing of the rotating speed, the normal loads between ball and cage will decrease and the force exerted by distribution pressure of fluid dynamic pressure on cage will increase. However, with the thrust load increasing, they tend to decrease gradually.