Research on Dynamic Stiffness of Ball Bearings Considering Ferrule Deformation and Elastohydrodynamic Lubrication

Aiming at the shortage of traditional quasi-static analytical method which did not consider the changes in geometrical positions of bearing inner raceway curvature center and the rolling body center caused by bearing thermal deformation,the centrifugal force deformation and the elastohydrodynamic lubrication effect,a bearing quasi-static modified model was established considering the effects of ferrule deformation and elastohydrodynamic lubrication.The effects of thermal deformation,the centrifugal force deformation and the lubricating oil film on bearing dynamic stiffness were studied by established model under conditions of different rotational speeds and bearing preloads.The validity of the established model was verified by comparison with the Gupta typical examples and experiments.