Dynamic Contact Analysis and Tooth Modification Design for EMU Traction Gear

Taking traction helical gear of EMU CRH380A as an example, the meshing characteristics was analysed. Based on Pro/E, three-dimensional helical gears were modelled. Combined with ANSYS, the gears' contacts were analysed under multi-condition, such as start-up, continuous and high speed. Through transient dynamics, the distribution cloud of the equivalent stress and contact pressure in a meshing period are solved, which at different meshing position under different condition. And the contact state, the stress changes and distribution regularity in the meshing process were analysed. Then on the basis of the results, gear modification parameters were designed, and the modification gears finite element model were constructed. To compare gear contact stress distribution before and after being modified, it shows that the modification scheme can effectively reduce the gear meshing impact and the transmission noise.