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Analysis on the Shift Characteristics of Semi-Spherical CVT using 2-dimensional Friction Model  

Kong, Jin-Hyung (Technical Center, Hyundai-Kia Motors)
Lim, Won-Sik (Department of Automotive Engineering, Seoul National University of Technology)
Park, Yeon-Gil (School of Mechanical Design and Automation Engineering, Seoul National University of Technology)
Kim, Jung-Yun (School of Mechanical and Automotive Engineering, Catholic University of Daegu)
Publication Information
Transactions of the Korean Society of Automotive Engineers / v.16, no.4, 2008 , pp. 103-109 More about this Journal
Abstract
Semi-spherical CVT(SS-CVT) is one of friction drives, which transmits power via the friction force between a spherical shaped variator and output disks. The variator varies the speed ratio of SS-CVT continuously as well as transmits input power into the output shaft. Therefore two friction forces are normally applied on the variator; one is the longitudinal friction force for power transmission and the other is the lateral for shifting. In order to investigate the dynamic behavior of SS-CVT, we introduced a numerical model of 2-dimensional friction force using a function of slip ratio and slip angle. And a dynamic model, which describes the shifting mechanism of SS-CVT, is developed through 3-dimensional vector analysis. Finally we presented numerical results of the shift characteristics focused on the transient behavior of the variator's slip ratio and slip angle. The numerical results also show the typical CVT shifting characteristics of SS-CVT and stable shifting behaviors of the variator.
Keywords
CVT; Semi-pherical CVT; Variator; Friction model; Slip ratio; Slip angle;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
연도 인용수 순위
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