Support Force and Load Distribution Analysis of Angular Contact Ball Bearing Considering Rotor Deformation

Abstract

A mechanical analysis model of angular contact ball bearings considering rotor deformation and inertial force of rolling elements is established. The research object being the rotor supported by high-speed instrument bearings as the research object, the bearing-rotor systems of cantilever support, and two-end support are analyzed. The effects of rotor structure and bearing internal parameters on bearing support force, stiffness, spin-roll ratio, and internal load distribution are examined. The results show that when the bearingrotor system is subjected to radial loads, due to the deformation of the rotor, the supporting bearings will be subjected to additional moment in addition to the radial load compared to a rigid rotor. With two-end support, the moment load on the bearing increases as the rotor length and hollowness increase. With cantilever support, the rotor hollowness has almost no effect on the radial load of the bearing, while the large rotor hollowness corresponds to large moment load on non-cantilever end bearing and small moment load on cantilever end bearing. Additionally, bearing moment load and radial load on both sides is directly proportional to rotor cantilever length. The maximum contact load of the rolling element is effectively reduced by increasing the initial contact angle and the number of rolling elements of the cantilever end bearing. The angular stiffness and the spin-roll ratio gradually decrease first and then gradually increase as the load ratio (the ratio of the radial load and the moment load) increases and are minimum when the load ratio is 0.67 and 0.61,respectively.