With the deeper understanding of the automobile, the noise of the automobile, especially the noise of the transmission system, has become the focus of attention. The transmission system of rear drive vehicle is mainly composed of clutch, gearbox, transmission shaft and rear axle. In the process of power transmission, spiral bevel gear is the most common part.
The rear axle of an automobile is mainly operated by a pair of spiral bevel gears to achieve the purpose of reducing speed and increasing torque. During the driving process of the vehicle, the spiral bevel gear is affected by the vibration excitation from the engine and tire and the deformation of the shell, bearing and spiral bevel gear itself, which makes the spiral bevel gear deviate from the optimal meshing area. The unreasonable meshing area will cause the spiral bevel gear to be unstable in the process of rotation, the vibration amplitude will be increased, and the unpleasant medium and high frequency howling noise will be generated.
As the main source of transmission system noise, the howling of spiral bevel gear pair has been deeply studied by some scholars and technicians. Qian Wantao analyzed the generation mechanism of the rear axle noise and established the acoustic simulation analysis model of the rear axle. Luo Wenxin studied the coupling vibration characteristics of the transmission shaft rear axle assembly system, and established a simulation analysis model based on ADAMS. Wang Bingshan used Masta software to analyze the shell vibration, and successfully reduced the howling noise of the third gear of the transmission by optimizing the coincidence degree of the spiral bevel gear. Xu Haijun and others established the dynamic response analysis model of the transmission shaft rear axle using Masta software, and optimized the parameters of the spiral bevel gear according to the simulation analysis results, achieving the purpose of reducing the transmission error of the spiral bevel gear and reducing the howling noise.
Based on the research of Xu Haijun and others, a complete dynamic response analysis model of power transmission system is established by using the Masta analysis software. Through the design optimization of the shell, bearing, gear, tie rod and transmission shaft, and the production of samples for real vehicle testing, the noise of the rear axle has been significantly improved.
Based on the analysis of the noise transmission path of the rear axle, a complete Masta simulation analysis model of the power transmission system is established. Based on a large number of simulation and analysis results, several key factors affecting the rear axle noise are locked. By optimizing the structure of key components, the rear axle noise problem is significantly improved, which provides a reference for the solution of related NVH problems.