In this paper we detail a review of the current state of published work regarding the modeling of rolling traction drive Continuously Variable Transmissions (CVTs). An overview of CVTs operating by traction through small contact areas is performed, the layouts and kinematics of leading examples are reviewed, including the factors affecting design optimization. Properties of the traction contacts are considered in detail, with particular attention to elastohydrodynamic lubrication and asperity contact. Factors affecting the traction coefficient are reviewed and fundamental empirical predictions are contrasted with modern modeling computations. Finally measurements of the rheology of traction fluids are considered, leading to a definition of ideal properties and the development of proprietary fluids.
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September 2006
Research Papers
CVT Rolling Traction Drives—A Review of Research Into Their Design, Functionality, and Modeling
S. Schaaf
S. Schaaf
InterSyn Technologies
, USA
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S. Akehurst
University of Bath
, UK
D. A. Parker
University of Bath
, UK
S. Schaaf
InterSyn Technologies
, USAJ. Mech. Des. Sep 2006, 128(5): 1165-1176 (12 pages)
Published Online: October 3, 2005
Article history
Received:
December 21, 2004
Revised:
October 3, 2005
Citation
Akehurst, S., Parker, D. A., and Schaaf, S. (October 3, 2005). "CVT Rolling Traction Drives—A Review of Research Into Their Design, Functionality, and Modeling." ASME. J. Mech. Des. September 2006; 128(5): 1165–1176. https://doi.org/10.1115/1.2214737
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