Research status of high speed helical gear transmission system for electric vehicles at China and abroad

Due to its advantages in efficiency, service life and application range, gear transmission has become an indispensable part of the transmission system of many mechanical equipment. Helical gear transmission has the advantages of large bearing capacity, smooth transmission, easy processing and adjustment. It is widely used in aviation, ship, automobile and construction machinery and other major fields. Its dynamic meshing performance has a significant impact on the reliability, stability and vibration and noise of the whole machine.

It is of great significance to study the dynamic characteristics of gear system systematically, analyze its meshing performance and vibration characteristics, so as to reduce vibration and noise, improve strength and life of the system. Therefore, the dynamic characteristics of gear transmission has always been a hot research topic at home and abroad.

The main excitation factors that affect the vibration characteristics of gear transmission include meshing stiffness, meshing damping, impact and clearance, and external excitation factors such as input torque fluctuation, gear mass eccentricity, load torque fluctuation and time-varying bearing stiffness. In the past research on the vibration characteristics of gear transmission system, time-varying meshing stiffness has been proved to be one of the most important internal excitation forms of gear system.

In the case of high speed, due to the large meshing impact force of the gear pair, the meshing impact force will also become an important factor causing the vibration of the gear system. Therefore, this paper mainly selects two excitation factors, time-varying meshing stiffness and meshing impact, to study the vibration characteristics of high-speed helical gear transmission of an electric vehicle reducer.