(1) At present, domestic and foreign research on the helical gear modification technology is almost concentrated on the simultaneous tooth profile or tooth direction drum modification of large and small gears. After comprehensive consideration of the different modification shapes, the selection of large and small gears, the selection of tooth profile and tooth direction, and the composite modification, this paper has carried out an in-depth study on the optimization scheme of the helical gear pair modification of an electric vehicle reducer.
(2) At present, there is a lack of systematic research on the vibration and noise of helical gears at home and abroad, and most of them are based on optimizing a certain index to indicate that the vibration and noise of helical gears has decreased (such as reducing transmission error or time-varying meshing stiffness), which is not convincing. From the angle of reducing the main dynamic excitation inside the helical gear, and taking into account the tooth shape, this paper finally proposes a new idea of helical gear optimization and modification. In addition, in order to improve the persuasiveness, it is also verified by meshing contact, multi-body dynamics and acoustic simulation.