Stiffness analysis of rolling bearing for concrete mixer

Abstract

Abstract According to the rolling bearing geometry, the basic principle of kinematics and Hertz elastic contact theory, eccentric mass of mixing shaft, the centrifugal force of steel ball and gyroscopic moment are considered and the dynamic model of angular contact ball bearing is established in this paper. Using this model, the effects of preload, radial load and rotating speed on bearing stiffness and system dynamic characteristics are analyzed in detail. The results show that with the increase of radial load, the axial static stiffness decreases, while the radial stiffness increases gradually, and the increasing trend of radial static stiffness is more obvious than that of axial static stiffness. The increase of rotating speed will soften the stiffness of the bearing. The natural frequencies of each order of the system show a downward trend with the increase of rotating speed.