关键词: 新能源汽车；齿轮轴；过盈压装；齿轮精度

Abstract: The interference press fitting process is widely used in the field of new energy vehicle gear shaft processing. Due to its involvement in interference press fitting, it may have a certain impact on gear accuracy, leading to a decrease in the noise, vibration, harshness (NVH) level of the electric drive assembly. In order to conduct in-depth research on the impact of driven gear press fit interference on the accuracy of the intermediate shaft gear, press fit tests are conducted based on two different interference amounts of 0.03 mm and 0.1 mm. The results show that both types of press fit interference caused the greatest cumulative impact on the gear, about 5 μm and 8 μm, respectively. In addition, the tooth angle of the intermediate shaft gear is sensitive to the press-fitting force, and the maximum change is about 6.5 μm. Therefore, based on the comparative analysis of the above test results: The gear accumulation and tooth orientation angle increase with the increase of press fit interference, which seriously affects the gear accuracy; Other gear accuracy parameters are not sensitive to the amount of interference pressing, and their changes are basically the same.

Key words: New energy vehicles; Gear shafts; Interference pressing; Gear accuracy