Abstract: A simulation and analysis model is established to describe the dynamic stiffness of double-row angular contact ball bearings based on the dynamics analysis. Fine integral method and predict-correct Adams-Bashforth-Moulton multi-step method are used to solve the dynamic stiffness model. The influences of bearing structural parameters and operating conditions on the dynamic stiffness are investigated. The research provides theoretical basis to analyze the dynamic stiffness and optimize the geometry parameters of double-row angular contact ball bearings. The results show that the groove radius of curvature has a small effect on the bearing dynamic stiffness. With the increase in inner and outer groove radii of curvature, the radial stiffness increases slightly, while the axial stiffness and angular stiffness decrease. The dynamic stiffness can be improved by increasing the number of balls. A big axial preload contributes to higher dynamic stiffness, while excess preload makes the bearing life decrease, so the axial preload should be selected properly. With the increase in rotating speed, the dynamic stiffness decreases first and then increases. The bearing dynamic stiffness can be replaced by the contact stiffness approximately when the bearing works at a low speed, while at a high speed, the bearing dynamic stiffness should be calculated by combining the contact stiffness with the film stiffness. External loads have an obvious effect on the dynamic stiffness, which gains greatly with the increase in radial and axial loads. The dynamic stiffness changes complexly with the increase in tilting moment, and decreases first and then increases trend on the whole.

Key words: mechanics, double-row angular contact ball bearing, dynamics, dynamic stiffness