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Experimental Analysis of 2-Dimensional Rolling Ftiction Occurred in Semi-Spherical CVT  

Kong Jinhyung (School of Mechanical and Aerospace Engineering, Seoul National University)
Yoon Youngmin (School of Mechanical and Aerospace Engineering, Seoul National University)
Lee Eung-shin (School of Mechanical and Aerospace Engineering, Seoul National University)
Lim Wonsik (Department of Automotive Engineering, Seoul National University of Technology)
Park Yeongi (School of Mechanical Design and Automation Engineering, Seoul National University of Technology)
Kim Dongjo (School of Mechanical Design and Automation Engineering, Seoul National University of Technology)
Lee Jangmoo (School of Mechanical Design and Automation Engineering, Seoul National University of Technology)
Publication Information
Transactions of the Korean Society of Automotive Engineers / v.13, no.5, 2005 , pp. 134-141 More about this Journal
Abstract
Semi-Spherical Continuously Variable Transmission(SS-CVT) is the CVT which transmits power by rolling friction between dry metals, and its outstanding advantage is the ability of realizations of neutral, forward and reverse states without relying on any other devices. A spherical shaped variator transmits power and also changes gear ratio where keeping contact with a output disk. The frictional direction to transmit power and the other direction to change gear ratio are perpendicular to each other, so we can describe that two dimensional rolling friction is occurred in the contact point between the variator and the disk. Since magnitudes or relations of the two forces are completely unknown, they were analyzed by the experiments in this study. We determined the variables related with the friction phenomena by the dimensional analysis, and manufactured the SS-CVT test bench which could measure the related variables. Finally, the empirical formula for evaluating the two friction forces was proposed based on the experimental results.
Keywords
SS-CVT; Variator; Rolling friction; Longitudinal slip ratio; Lateral slip angle; Friction coefficient;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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