行星齿轮式两挡变速器匹配与结构设计验证

Matching and Structure Design Verification for Planetary Gear Two Speed Transmission

为解决直驱式电动汽车平均传动效率较低及传统双轴式两挡变速器结构不够紧凑等问题,提出了一种用于电动乘用车的行星齿轮式两挡变速器方案。完成了动力传动系统参数匹配,通过AVL Cruise初步验证了参数匹配的合理性;根据匹配结果,对行星齿轮式两挡变速器进行了结构参数设计,并据此对传动比等关键参数进行了修正;基于CATIA建立了变速器的三维模型,对其关键部件进行了强度验证;通过与常用直驱方案的对比表明,整车百公里加速时间缩短了0.31 s,最大爬坡度由直驱方案的34%增加到37%,最高车速提高了21 km/h,NEDC工况下的续航里程增加了18 km,提出的行星齿轮式两挡变速器可有效提高整车的动力性和经济性。

In order to solve the problems of low average transmission efficiency of direct drive electric vehicle and the structure of traditional two shaft two speed transmission is not compact enough,a planetary gear two speed transmission scheme for electric passenger vehicles is proposed.And the parameters of power transmission system are matched,through the AVL Cruise preliminarily,the rationality for the parameter matching is verified.According to the matching result,the structural parameters for the planetary gear two speed transmission are designed.And the transmission ratio and other key parameters are modified.The three-dimensional model for the transmission is established based on CATIA.The strength for the key components is verified.Compared with the common direct scheme,the results show that the acceleration time for the whole vehicle will shorten 0.31 s when driving 100 km,the maximum climbing gradient will increase from 34%of direct drive scheme to 37%,the maximum vehicle speed will increase by 21 km/h,and the driving range under NEDC condition will also increase by 18 km.So the planetary gear type two speed transmission can effectively improve the power and economy for the whole vehicle.