二级减速式轮边驱动系统设计与仿真

DESIGN AND SIMULATION OF TWO-STAGE REDUCTION WHEEL DRIVE SYSTEM

以电动轮为主要特征的分布式驱动渐成新能源汽车的主要研究方向,但具有减速机构的轮边驱动系统因引入了电机和减速器,显著增加了非簧载质量,恶化了车辆的操纵稳定性。为此,本文提出了一种将非簧载质量转移为簧载质量的二级减速式轮边驱动系统结构布置方案,并建立1/4车辆三自由度垂向振动系统模型,通过仿真分析验证此种设计方案的有效性。研究结果表明,二级减速式轮边驱动系统能有效抑制车身垂向振动的幅度,降低轮胎动载荷,提高汽车行驶平顺性和轮胎接地性。

Distributed driving, mainly characterized by electric wheels, has become the main research direction of new energy vehicles. But motor and reducer are integrated to the wheels drive system which has reduction mechanism, the unsprung mass is obviously increased. The vehicle maneuverability is deteriorated. Therefore, a structure scheme of the two-stage reduction wheel drive system that transfers the unsprung mass to the sprung mass was proposed. A 1/4 vehicle three degrees of freedom vertical vibration system model was established. Furthermore, the validity of design scheme was proved by simulation analysis. The results show that the two-stage reduction wheel drive system can effectively suppress the vertical vibration, reduce the tire dynamic load and improve vehicle.