A Systematic Model for the Analysis of Contact, Side Slip and Traction of Toroidal Drives

[+] Author and Article Information
Y. Zhang

Department of Mechanical Engineering, University of Michigan-Dearborn, Dearborn, MI 48128

X. Zhang, W. Tobler

Ford Research Laboratory, Ford Motor Company, MI 48121

J. Mech. Des 122(4), 523-528 (Apr 01, 1999) (6 pages) doi:10.1115/1.1290248 History: Received April 01, 1999
Copyright © 2000 by ASME
Topics: Force , Rollers , Traction , Disks
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Hewko, L. O., 1986, “Automotive Traction Drive CVTs—An Overview,” SAE Paper 861355.
Loewenthal, S. H., and Rohn, D. A., 1983, “Advances in Traction Drive Technology,” SAE Paper 831304.
Nakano, M., Hibi, T., and Kobayashi, K., 1992, “Dual-Cavity Half Toroidal CVT for Passenger Cars,” SAE Paper 922105.
Machida, H., and Hurachi, N., 1990, “Prototype Design and Testing of the Half Toroidal CVT,” SAE Paper 900552.
Machida, H., and Abe, T., 1996, “Fatigue Life Analysis of a Traction Drive CVT,” SAE Paper 9636402.
Kumura, H., Nakano, M., Hibi, T., Sugihara, J., and Kobayashi, K., 1996, “Performance of a Dual-Cavity Half-Toroidal CVT for Passenger Cars,” SAE Paper 9636466.
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Imanishi, T., Machida, H., and Tanaka, H., 1996, “A Geometric Study of Toroidal CVT—a Comparison of Half Toroidals and Full Toroidals,” SAE Paper 9636411.
Tevaarwerk,  J. L., and Johnson,  K. L., 1979, “The Influence of Fluid Rheology on the Performance of Traction Drives,” ASME J. Lubr. Technol., 101, pp. 266–274.
Tanaka,  H., 1989, “Power Transmission of a Cone Roller Toroidal Traction Drive,” JSME Int. J., Ser. III, 32, No. 1, pp. 82–90.
Tanaka,  H., and Eguchi,  M., 1993, “Stability of a Speed Ratio Control Servo-Mechanism for a Half-Toroidal Traction Drive CVT,” JSME Int. J., Ser. C, 36, No. 1, pp. 135–140.
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Burr, A. H., 1981, Mechanical Analysis and Design, Elsevier, New York.


Grahic Jump Location
Geometry of a half toroidal CVT
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FBD of the loading mechanism
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Change of contact point due to roller axis offset
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Directions of creep, side slip and spin
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Directions of traction and side slip on the contact ellipse
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Normalized traction and side slip forces vs roller offset



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