同轴直联电动车桥传动系统动态特性研究

同轴直联电动车桥采用行星减速机构,相比传统结构车桥具有传动比大、结构紧凑等优势。采用集中参数法建立了同轴直联纯电驱动车桥的动力学模型,并基于Runge-Kutta方法对不同输入转数下系统的输入与输出构件动态响应进行了计算与分析。结果表明,随着转数的提高,系统各构件振动呈现多个峰值,且高阶临界转数对应振动峰值对整体振动的贡献影响大于低阶临界转数。计算结果为进一步隔振分析提供参考,对提升电动汽车的振动噪声性能具有指导意义。

Study on the Dynamic Characteristic of Coaxial Direct Coupling Electric Axle

Coaxial direct coupling electric axle has the advantage of large transmission ratio and compact structure compared with traditional axles due to the application of planetary mechanism. Dynamic model of the axle is established using the lumped parameter method,calculation and analysis on the dynamic response of the input and output components under varying input revolution are conducted on the basis of Runge-Kutta method. The results show that the vibration of the system shows multi peaks with the increase of input revolution. The peak value of vibration corresponding to higher order critical revolution has greater influence on the overall vibration than that corresponding to lower order critical revolution. The results provide reference for the further vibration isolation analysis,and show guiding significance on the improvement of vibration and noise performance of electric vehicles.