The paper is the first of a series of papers that present an original constant power continuously variable transmission (CP-CVT) traction drive. This paper presents the basic functional principle and demonstrates the device’s characteristics of constant power. The device belongs to the well-known toroidal traction drive family. It comprises of two input discs, one conical and the other toroidal, a conical output disc, and a number of spherical balls. The rotation axis of each ball is self-adjusted according to its geometrical position relative to the input and output discs. A variation of the output torque makes the balls change their position relative to the discs and thus causes a change of the transmission ratio. The kinematics and dynamics of the balls are first performed and then the formulas that relate the power transmitted to the kinematics and geometric parameters are deducted. Finally it is concluded that the CP-CVT presented offers good functional steady power characteristics that could fit the automobile industry requirements.
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January 2005
Technical Papers
Constant Power Continuously Variable Transmission (CP-CVT): Operating Principle and Analysis
O. S. Cretu,
O. S. Cretu
Tribo Consulting, 5308 Bouldvard Ext., Olympia, WA 98501
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R. P. Glovnea
R. P. Glovnea
Tribology Section, Imperial College London, Exhibition Road, London SW7 2BX, UK
Search for other works by this author on:
O. S. Cretu
Tribo Consulting, 5308 Bouldvard Ext., Olympia, WA 98501
R. P. Glovnea
Tribology Section, Imperial College London, Exhibition Road, London SW7 2BX, UK
Contributed by the Mechanisms and Robotics Committee for publication in the JOURNAL OF MECHANICAL DESIGN. Manuscript received September 30, 2003; revised April 14, 2004. Associate Editor: M. Raghavan.
J. Mech. Des. Jan 2005, 127(1): 114-119 (6 pages)
Published Online: March 2, 2005
Article history
Received:
September 30, 2003
Revised:
April 14, 2004
Online:
March 2, 2005
Citation
Cretu, O. S., and Glovnea, R. P. (March 2, 2005). "Constant Power Continuously Variable Transmission (CP-CVT): Operating Principle and Analysis ." ASME. J. Mech. Des. January 2005; 127(1): 114–119. https://doi.org/10.1115/1.1828457
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