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TECHNICAL PAPERS

Kinematics of the Full-Toroidal Traction Drive Variator

[+] Author and Article Information
Madhusudan Raghavan

Powertrain Systems Research Lab, GM R&D Center, 30500 Mount Road, Warren, MI 48090-9055e-mail: madhu.raghavan@gm.com

J. Mech. Des 124(3), 448-455 (Aug 06, 2002) (8 pages) doi:10.1115/1.1480816 History: Received January 01, 2001; Online August 06, 2002
Copyright © 2002 by ASME
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References

Hewko, L., 1986, “Automotive Traction Drive CVTs–An Overview,” SAE 861355.
Fellows, T. G., et al., 1963, “Continuously Variable Ratio Transmission,” Cranfield Symposium on Automatic Transmissions, Perbury, UK.
Stubbs, P. W. R., 1980, “The Development of a Perbury Traction Transmission for Motor Car Applications,” ASME International Power Transmission & Gear Conference, 80-C2/DET-59.
Greenwood, C. J., 1984, “The Design, Construction, and Operation of a Commercial Vehicle Continuously Variable Transmission,” Proceedings of the Institution of Mechanical Engineers, C11/84.
Fellows, T. G., and Greenwood, C. J., 1991,“The Design and Development of an Experimental Traction Drive CVT for a 2.0 Liter FWD Passenger Car,” SAE 910408.
Smith, M. J., Tidmarsh, D. H., and Foss, P., 1991, “The Development of High Specific Output Engines for Use with a Two Regime IVT,” SAE 914317.
Smith, M. J., Greenwood, C. J., and Soar, G. B., 1992, “A Full-Toroidal Traction Drive CVT – From Theory to Practice,” SAE 925061.
Imanishi, T., Machida, H., and Tanaka, H., 1996, “A Geometric Study of Toroidal CVT–A Comparison of Half Toroidals and Full Toroidals,” SAE 968128.
Zhang, X., Tobler, W., and Zhang, Y., 1999, “Kinematic Analysis and Modeling of Traction Drive CVT,” DETC-99/DAC-8658, Proceedings of the DETC99, 1999 ASME Design Engineering Technical Conferences, Sep 12–16, 1999, Las Vegas, Nevada.
Ono, Y., et al., 2000, “The Durability and Reliability of Variators for a Dual-Cavity Full-Toroidal CVT,” SAE 2000-01-0826.
Patterson, M., 1996, “The Full-Toroidal Variator in Theory and in Practice,” Proceedings of CVT ’96, International Conference on Continuously Variable Power Transmissions, Yokohama, Japan, Sep. 11–12, pp. 95–100, Paper No. 203/9636394.
Craig, J. J., 1986, “Introduction to Robotics,” Addison-Wesley Publishing Co., page 47.

Figures

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Front, top, and side-views of the full-toroidal traction drive
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Velocity vectors and principles of roller steering
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Torus and roller in side-view
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Roller normal in side-view
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Effect of caster on roller normal
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Roller in generic position
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Input-output speed ratio as a function of roller displacement
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(a ) Kinematic simulation; roller inclination, and speed ratio versus roller displacement. (b ) Sensitivity of speed ratio change to torus proportions. (c ) Sensitivity of speed ratio change to caster angle.

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