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Compound CVT with K-H-V Differential Gear and V-belt Drive  

Kim, Yeon-Su (LRT System Development Team, Korea Railroad Research Institute)
Choi, Sang-Hoon (Department of Mechanical Design and Production Engineering, Konkuk University)
Publication Information
International Journal of Precision Engineering and Manufacturing / v.6, no.1, 2005 , pp. 5-14 More about this Journal
Abstract
Continuously variable transmission (CVT) mechanisms combine the functions of a K-H-V type differential gear unit and a V-belt type continuously variable unit (CVU). For the 24 different mechanisms, 12 of them are power circulation modes while the other 12 are power split modes. Some useful theoretical formulas related to speed ratio, power flow and efficiency were derived and analyzed. These mechanisms have many advantages: they decrease CVT size and weight, increase overall efficiency, extend speed ratio range, and generate geared neutral. Compound CVTs were developed by combining the power circulation mode and power split mode, which can offer backward motion, geared neutral, underdrive and overdrive.
Keywords
Continuously variable transmission; input coupled; power circulation; power split; compound CVT;
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