Jixie chuandong (Feb 2023)
Research on the Design Method of the Modified Gear Tooth Surface Based on the Gear Time-varying Meshing Process
Abstract
The ideal tooth surface in the meshing process of helical gears is an involute helical surface, but in the actual service process, there is a certain deviation between the actual tooth surface and the ideal tooth surface due to the influence of gear load, thermal deformation and support deformation. The tooth surface modification method is usually used to reduce the tooth surface eccentric load and vibration caused by position deviation. The existing modification methods often use the formula method considering the size of the load to calculate the modification amount. Although it can improve the transmission performance to a certain extent, there is still the problem of low design accuracy. Thus, a topological modification tooth surface design method based on the time-varying meshing process of gears is proposed to improve the meshing performance of gear pair transmission. Firstly, Ishikawa formula is improved by dividing the tooth surface along the contact trace of helical gears, and the time-varying stiffness model of helical gear pair tooth surface is established; then, the six-degree-of-freedom dynamic equation is established according to the actual meshing process of the gear pair; finally, according to the comprehensive deformation of the tooth surface calculated by the dynamic equation, the topological modification of the compensated tooth surface is designed, and the dynamic simulation is carried out. Through the simulation comparison with the modified gear designed by the traditional formula method, the effectiveness of the proposed method is verified.
