Constant Power Continuously Variable Transmission (CP-CVT): Operating Principle and Analysis-Reference-Cited by-同舟云学术

Constant Power Continuously Variable Transmission (CP-CVT): Operating Principle and Analysis

Published:2005-01-01 Issue:1 Volume:127 Page:114-119
ISSN:1050-0472
Container-title:Journal of Mechanical Design
language:en
Short-container-title:

Author:

Cretu O. S.¹,Glovnea R. P.²

Affiliation:

1. Tribo Consulting, 5308 Bouldvard Ext., Olympia, WA 98501

2. Tribology Section, Imperial College London, Exhibition Road, London SW7 2BX, UK

Abstract

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.

Publisher

ASME International

Subject

Computer Graphics and Computer-Aided Design,Computer Science Applications,Mechanical Engineering,Mechanics of Materials

Link

http://asmedigitalcollection.asme.org/mechanicaldesign/article-pdf/127/1/114/5684515/114_1.pdf

Reference12 articles.

1. Arita, M., 2000, “Recent CVT Technology and Their Effect on Improving Fuel Economy,” Proceedings International Trib. Conference, Nagasaki, Japanese Society of Tribologists, pp. 197–201.

2. Ishihama, M., 1995, “The Technological Trend of Automobile Fuel Economy and the Role of Tribology,” Proceedings International Trib, Conference, Yokohama, Japanese Society of Tribologists, pp. 1661–1666.

3. Tanaka, H. , 1989, “Power Transmission of a Cone Roller Toroidal Traction Drive,” JSME Int. J., 32(1), pp. 82–86.

4. Nagata, H., Ishibashi, A., Hoyashita, S., and Takedomi, H., 1991, “A Variable-Speed Traction Drive With Spherical Disks-(Mechanism of Traction Drive and Method for Calculating Power Transmission Efficiency),” JSME Int. J., Ser. III, 34(4), pp. 518–525.

5. Machida, H. , 1993, “Development of Traction Drive CVT for Automobiles,” J. Jpn. Soc. Trib., 38(7), pp. 593–598.

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