基于球-滚道非完全接触状态下的球轴承载荷分布计算及刚度特性研究

Aiming at the theoretical modelling and characteristic analysis of ball bearing under the ball-raceway separation condition, the new initial position for ball bearing modelling is proposed. Combining with the ball-raceway contact analysis, a general model for ball bearing under different load conditions is presented. Then the proposed model is solved by a nested Newton-Raphson iterative algorithm based on the analytical calculation method for bearing stiffness matrix. On this basis, the load distribution and stiffness characteristic of ball bearing under three different load conditions are analyzed. The results show that the proposed model is more reasonable and applicable than the Jones-Harris model. Moreover, the internal load distribution and stiffness are determined by both the external load and internal contact state of ball bearing, and the number of balls in loaded zone caused by the changes of the radial clearance, external load and speeds can further lead to the sudden change of bearing stiffness. In addition, appropriate increases of axial load can effectively improve the load distribution and increase the numbers of balls in loaded zones of ball bearing.