牵引式锥盘滚轮CVT的研究现状及发展趋势

锥盘滚轮式CVT依靠滚动体间弹性流体润滑油膜(EHL)的剪切力来传递动力，是典型的牵引式无级变速器。它具有调速灵敏、传递功率大、传动效率高等特点，可在较大排量的车辆上应用。介绍了国内外锥盘滚轮式CVT的发展历史，综述了国内外在流体理论、牵引油、传动系统、调速系统等方面研究现状。指出带有机、电、液混合控制系统的多接触点分汇流式双腔锥盘滚轮式CVT将是今后大功率无级变速器的发展方向。同时还指出基于自传最小的结构参数优化、多滚子的同步性研究以及新材料新工艺的开发将是今后开发研究中要解决的主要问题。

Current Situation and Trend of the Traction CVT

In a toroidal CVT, power transmission is accomplished by means of a special traction oil that displays high shear resistance under a state of high pressure . A toroidal CVT can be used even with engines that generate large torque and provide excellent ratio change response and high efficiency . The history of research of the toroidal CVT are summarized and the toroidal CVT up to date is reported. The varieius aspects on the toroidal CVT are summarized ,including EHL theory , toroidal double cavity system,traction fluid ,ratio control system, traction drive system , efficiency analysis ,and so on. Finally ,The development of the toroidal CVT in the future is indicated.