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A Survey of Positive Engagement, Continuously Variable Transmissions

[+] Author Affiliations
Brian S. Andersen, Ryan R. Dalling, Robert H. Todd

Brigham Young University, Provo, UT

Paper No. DETC2007-34856, pp. 1081-1087; 7 pages
  • ASME 2007 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference
  • Volume 7: 10th International Power Transmission and Gearing Conference
  • Las Vegas, Nevada, USA, September 4–7, 2007
  • Conference Sponsors: Design Engineering Division and Computers and Information in Engineering Division
  • ISBN: 0-7918-4808-6 | eISBN: 0-7918-3806-4
  • Copyright © 2007 by ASME


A continuously variable transmission (CVT) is a type of transmission that allows an infinitely variable ratio change within a finite range, allowing the engine to continuously operate in an efficient or high performance range. A brief history of CVT’s is presented, including the families under which they can be categorized. A new family of CVT’s, with the classification of positive engagement, is presented. Three different published embodiments of CVT’s of the positive engagement type are presented describing a meshing problem that exists apparently regardless of the embodiment in this family. The problem is called the non-integer tooth problem and its occurrences are detailed in each of the three embodiments. Specific solutions to the problem, as embodied in each case, are presented. Two additional embodiments of the positive engagement type are also presented for comparison. These last embodiments rely on less efficient methods of power transmission but are not subject to the non-integer tooth problem.

Copyright © 2007 by ASME
Topics: Engines



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