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
Your Session has timed out. Please sign back in to continue.


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.


Grahic Jump Location
Roller normal in side-view
Grahic Jump Location
Effect of caster on roller normal
Grahic Jump Location
Roller in generic position
Grahic Jump Location
Input-output speed ratio as a function of roller displacement
Grahic Jump Location
(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.
Grahic Jump Location
Front, top, and side-views of the full-toroidal traction drive
Grahic Jump Location
Velocity vectors and principles of roller steering
Grahic Jump Location
Torus and roller in side-view



Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In