关键词: 轴箱轴承, 热力耦合, 接触特性, 温度, 高速列车

Abstract: As the core component of high-speed trains, axle box bearings will seriously threaten the safe operation of vehicles once they fail. However, the internal temperature distribution and contact characteristics of the bearing during service are extremely complex and difficult to monitor effectively. Therefore, the steady-state temperature field model and static finite element model of axle box bearing are established and verified by line test and theoretical results respectively. Furthermore, considering the influence of lubricant on the friction heat generation and heat dissipation inside the bearing, a thermo-mechanical coupling finite element model of high-speed train axle box bearing is constructed, which can accurately reproduce the internal temperature distribution and contact characteristics of the train axle box bearing. Based on this, the temperature distribution law inside the axle box bearing is systematically studied, and the influence of temperature on the internal contact characteristics of the axle box bearing is analyzed. The influence of composite load and speed on the temperature and contact characteristics of the bearing is studied. The results show that the temperature has a significant effect on the stress of each part of the bearing, and the maximum stress of the bearing increases by 489.26 % considering the temperature. The temperature and stress inside the bearing increase with the increase of combined load and rotational speed, and the effect of temperature on stress is more significant. The research results can provide theoretical guidance and technical support for the contact behavior research and parameter optimization design of high-speed train axle box bearings.