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An Analysis of a Frictional Coupling Mechanism in Rolling Variators With Initial Point Contact

[+] Author Affiliations
S. A. Lukowski, D. R. B. Kraemer, M. E. Momot

University of Wisconsin at Platteville, Platteville, WI

L. A. Medeksza

Gannon University, Erie, PA

Paper No. DETC2007-34268, pp. 1071-1080; 10 pages
doi:10.1115/DETC2007-34268
From:
  • ASME 2007 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference
  • Volume 7: 10th International Power Transmission and Gearing Conference
  • Las Vegas, Nevada, USA, September 4–7, 2007
  • Conference Sponsors: Design Engineering Division and Computers and Information in Engineering Division
  • ISBN: 0-7918-4808-6 | eISBN: 0-7918-3806-4
  • Copyright © 2007 by ASME

abstract

This paper presents an analysis of the frictional coupling mechanism in rolling variators with initial point contact. Rolling variators are continuously variable transmissions where the power is transmitted by frictional contact between nonflexible rotating elements. The essential feature of this type of transmission is that the adjoining surfaces rotate when the rolling elements roll against each other resulting in drilling-type friction due to drilling-type motion. The performance characteristics of rolling variators are thus evaluated on the basis of both the drilling-type friction and tangential forces, which transmit the power. Relationships between the characteristic parameters of frictional coupling elements are derived and expressed in the form of integrals, which can be readily evaluated numerically for the tangential force utilization coefficient, power loss coefficient, and geometric efficiency. The analysis of the frictional coupling mechanism in rolling variators constitutes a tangible contribution to the theory dealing with the design of this type of continuously variable transmissions.

Copyright © 2007 by ASME
Topics: Mechanisms

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