电动汽车牵引无限变速器的传动特性研究

设计了用于电动汽车传动系统的牵引无限变速器(TIVT).在分析其基本结构和工作原理的基础上,系统地分析了其核心部件的运动学和动力学特性,建立了传动比、滑动率、传递转矩和传动效率的数学模型,进而利用仿真软件ADMAS对其主要传动特性进行了分析研究和数值计算.结果表明,当输入转速不变时,输出转速随操纵环摆动角的变化而变化;当动力传动部件之间纯滚动或滑动率较小时,牵引无限变速器的传动效率较高,合理的设计可使传动效率达到99%.以某型号纯电动汽车为计算实例,其它条件完全相同时,匹配TIVT的电动汽车续驶里程较原车增加8.8km.

Study on transmission characteristics of traction infinitely variable transmission used in electric vehicles

The traction infinitely variable transmission(TIVT) used in the powertrain of electric vehicles(EVS) was designed.Based on the analyses of basic configuration and working principle,the properties of its kinematics and dynamics of the key components were systematically analyzed,and the mathematicd models of transmission ratio,sliding percentage, transferring torsion and driving efficiency were established.We further used the ADMAS simulation software to carry out the analytical study and numerical calculation.The calculation results showed that the output speed varied with the sway angle of the steer ring if the input one was constant,that the efficiency of TIVT was relatively high when the motion of the driving parts was pure rolling or had small sliding percentage,and that rational design can make the transmission efficiency up to 99%. Based on some type of EVS,the driving range of EVS matched with TIVT was about 8.8km more than original EVS at the same condition.