The mechanical behavior of V-belt variators during the speed ratio shift is different from the steady operation as a gross radial motion of the belt is superimposed to the circumferential motion. The theoretical analysis involves equilibrium equations similar to the steady case, but requires a re-formulation of the mass conservation condition making use of the Reynolds transport theorem. The mathematical model of the belt-pulley coupling implies the repeated numerical solution of a strongly non-linear differential system. Nevertheless, an attentive observation of the numerical diagrams suggests simple and useful closed-form approximations for the four possible working modes of any pulley, opening/closing, driver/driven, whose validity ranges over most practical cases. The present analysis focuses on the development of such simplified solutions, succeeding in an excellent matching with the numerical plots, and on the comparison of the theory with some experimental tests on a motorcycle variator, revealing a very good agreement.
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ASME 2009 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference
August 30–September 2, 2009
San Diego, California, USA
Conference Sponsors:
- Design Engineering Division and Computers in Engineering Division
ISBN:
978-0-7918-4903-3
PROCEEDINGS PAPER
Approximate Closed-Form Solutions for the Shift Mechanics of Rubber Belt Variators
Marco Cammalleri,
Marco Cammalleri
University of Palermo, Palermo, Italy
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Francesco Sorge
Francesco Sorge
University of Palermo, Palermo, Italy
Search for other works by this author on:
Marco Cammalleri
University of Palermo, Palermo, Italy
Francesco Sorge
University of Palermo, Palermo, Italy
Paper No:
DETC2009-86638, pp. 187-196; 10 pages
Published Online:
July 29, 2010
Citation
Cammalleri, M, & Sorge, F. "Approximate Closed-Form Solutions for the Shift Mechanics of Rubber Belt Variators." Proceedings of the ASME 2009 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. Volume 6: ASME Power Transmission and Gearing Conference; 3rd International Conference on Micro- and Nanosystems; 11th International Conference on Advanced Vehicle and Tire Technologies. San Diego, California, USA. August 30–September 2, 2009. pp. 187-196. ASME. https://doi.org/10.1115/DETC2009-86638
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