Abstract:  Aiming at the problem of unclear contact characteristics of gears of new energy vehicles, the dynamic contact characteristics of hub reducers of new energy vehicles were studied. Based on the gear contact theory, the three-dimensional model and finite element model of the hub reducer were first established, and the dynamic contact simulation analysis was carried out using finite element analysis software. The theoretical calculation results were compared with the finite element simulation results to verify the reliability of the finite element model. The influence of different load and rotating speed on the maximum equivalent stress and deformation of each gear of the hub reducer of traditional fuel and new energy vehicles was further compared and analyzed. Finally, the influence of different friction and stiffness on the dynamic contact characteristics of the hub reducer of new energy vehicles was analyzed. The research results show that the maximum equivalent stress and deformation of each gear of the hub reducer of new energy vehicles are significantly greater than that of traditional fuel vehicles. With the increase of load and rotating speed, the maximum equivalent stress and deformation of each gear increase to different degrees. Under adjacent conditions, the maximum equivalent stress value of the sun gear increases by 31.2%, and the deformation of the sun gear tooth top increases by 0.859 1mm; with the increase of friction and stiffness, the maximum contact stress of the gear tooth surface increases, the rigidity increases, and the tooth surface penetration depth decreases.

Key words: reducer; hub reducer; planetarygear train; dynamic characteristics; contact characteristics

QU Wei, FAN Zhi-min, CHEN Liang, et al. Dynamic contact characteristics of planetary gear reducer［J］.Journal of Mechanical & Electrical Engineering, 2022,39(2):224-230.