牵引式无级变速器的传动特性  

Transmission Characteristics of Continuously Variable Transmission with Traction Drive

作　　者：沈楚敬[1] 苑士华[1] 胡纪滨[1] 吴维[1] 魏超[1] 

机构地区：[1]北京理工大学车辆传动重点实验室,北京100081

出　　处：《华南理工大学学报（自然科学版）》2012年第12期117-121,共5页Journal of South China University of Technology(Natural Science Edition)

基　　金：国家部委基础科研项目(A2220060029);车辆传动国家重点实验室基金资助项目(9140C340201113403)

摘　　要：研究了牵引式无级变速器的传动机理,以及传动接触区牵引系数的影响因素和求解方法,通过内、外摩擦副牵引系数之间的关系,探究了作用在内、外摩擦副上的法向加载力和外摩擦副滑滚比的求解方法,分析了系统功率损失的主要因素和求解方法,最后得到作用在内、外摩擦副上的法向加载力、自旋功率损失、滑动功率损失和传动效率随传动比的变化规律.研究表明:在输入转速、转矩和内摩擦副滑滚比已知的情况下,法向加载力随着传动比的增大而增大,但增大幅度较小;滑动功率损失随着传动比的增大而增加,自旋功率损失则随着传动比的增大而不断减少;随着传动比的增大,滑动功率损失对系统传动功率的影响越来越大,自旋功率损失则反之,系统总的功率损失随着传动比的增大而减少,最后趋于稳定;系统总传动效率随着传动比的增大而增大,最后也趋于稳定,保持在83%左右.In this paper, the transmission principle of the continuously variable transmission with traction drive is analyzed, and the factors affecting the traction coefficient of the contact path and the corresponding solving methods are explored. Then, based on the relationship of the traction coefficient between the inner and the outer friction pairs, the normal force loading on the inner and the outer friction pairs, as well as the slip-roll ratio of the outer friction pairs, is investigated, and the main causes and solving method of the power loss are analyzed. Finally, the variations of the normal force, the power loss of spinning, the power loss of slipping and the transmission efficiency with the transmission ratio are discussed. The results show that （ 1 ） under given input rotational speed, torque and slip-roll ratio of the inner friction pairs, the normal force slightly increases with the transmission ratio ; （2） with the increase of transmission ratio, the power loss of slipping increases while the power loss of spinning decreases, the effect of the power loss of slipping on the system transmission power becomes more important while the power loss of spinning has an opposite effect ; （3） the total power loss decreases with the increase of transmission ratio and tends to be constant in the end; and （4） the total transmission efficiency of the system increases with the transmission ratio and tends to be constant, with its value remaining constant at about 83% in the end.

关 键 词：无级变速器 牵引传动 牵引系数 传动效率 滑动 自旋 

分 类 号：TH132[机械工程—机械制造及自动化]