The influence of mesh misalignment on planetary gear set with time-varying mesh stiffness

摘要

Mesh misalignment has a bad influence on vibration characteristics of planetary gear set which may lead to some initial failures and fatigue life reduction of the gear system. In order to study the underlying mechanism of the mesh misalignment, a dynamic model of planetary gear set is established in this paper, in which the time-varying mesh stiffness (TVMS) coupled with the mesh misalignment model are taken into consideration. Firstly, the TVMS including tooth bending stiffness, shearing stiffness, axial compressive stiffness, fillet-foundation deflection and Hertzian contact stiffness are calculated via analytical method. Secondly, the length fluctuation of the contact line and the load distribution due to mesh misalignment are obtained by dividing the tooth into several slices along tooth width direction. Finally, the influence of different degree of mesh misalignments on dynamic transmission errors (DTE) and dynamic responses are studied based on the proposed dynamic model.