Analysis and Optimization of Light Buses E-Axle System Based on Whine Noise 2023-01-1102

E-Axle (electric drive axle) system has the advantages of environmental protection and fuel saving, which is one of the main development directions of power train for light buses today, and its NVH (Noise、Vibration、Harshness) performance is receiving more and more attention. In this paper, the whine noise of light buses during acceleration is studied. Firstly, by establishing the noise spectrum analysis method, the main problems of the vehicle are identified as motor whine noise and reducer whine noise. Next, under the condition of ensuring motor performance and low cost, the gas tightness and sound insulation path optimization method of the vehicle is proposed to solve the motor whine noise. At the same time, starting from the research of gear micro modification, and establishing the gear production and assembly process optimization technology to control the reducer whine noise. Finally, the whine noise is optimized by about 8 dB (A). The results show that the optimization method proposed in this paper effectively solves the whine noise problem,which provide key technical support for the smooth production of the vehicle. It have strong practical guiding significance for the NVH performance design and development of the later E-axle system project.