We present a geometric derivation of the kinematics of the steering action and the roller displacement in a full-toroidal continuously variable traction drive variator. In particular, expressions relating the inclination of the roller to its displacement for designs incorporating a caster angle are derived. These results are useful in the design of the control system for the variator.
Issue Section:
Technical Papers
1.
Hewko, L., 1986, “Automotive Traction Drive CVTs–An Overview,” SAE 861355.
2.
Fellows, T. G., et al., 1963, “Continuously Variable Ratio Transmission,” Cranfield Symposium on Automatic Transmissions, Perbury, UK.
3.
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.
4.
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.
5.
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.
6.
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.
7.
Smith, M. J., Greenwood, C. J., and Soar, G. B., 1992, “A Full-Toroidal Traction Drive CVT – From Theory to Practice,” SAE 925061.
8.
Imanishi, T., Machida, H., and Tanaka, H., 1996, “A Geometric Study of Toroidal CVT–A Comparison of Half Toroidals and Full Toroidals,” SAE 968128.
9.
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.
10.
Ono, Y., et al., 2000, “The Durability and Reliability of Variators for a Dual-Cavity Full-Toroidal CVT,” SAE 2000-01-0826.
11.
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.
12.
Craig, J. J., 1986, “Introduction to Robotics,” Addison-Wesley Publishing Co., page 47.
Copyright © 2002
by ASME
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