Friction torque analysis of high-speed spindle bearing based on the quasi-static improved model

Abstract

In order to solve the problem that the quasi-static model cannot calculate the friction torque of the high-speed spindle bearing, a new improved quasi-statics analysis model which can be used to calculate the friction torque of high-speed bearing was established, in which the force balance condition of ball bearing in rotary plane was added by comprehensively considering the role of the cage and the oil films. And its correctness was verified by both theory and experiment. Based on the improved quasi-static model, the friction torque which affects the internal characteristic and service performance of high-speed spindle bearing is analyzed systematically. Results indicate that the rotation speed and axial pre-load and installation are the key factors influencing the spindle bearing internal friction torque and the friction torque inside the bearing can be effectively reduced by selecting ceramic balls and more small balls structure as well as optimizing the curvature parameters of the raceway of the bearing rings, etc. In addition, the improved quasi-static analysis method provides a new and effective analysis method for the performance analysis, structural optimization design and practical application of high-speed spindle bearing.