This paper proposes a theoretical description of the mechanical behavior of rubber belt variators during the speed ratio shift. Comparing with the steady operation, the mass conservation of the belt is completely reformulated considering an elementary dihedral control volume between two planes through the pulley axis and balancing the inside mass variation with the total mass flux through the control surface. On the other hand, the belt equilibrium conditions are similar to the steady case, as the inertia forces due to the shifting motion are negligible with respect to the other forces. Assuming a one-dimensional belt model, it is shown that adhesive regions may appear inside the arc of contact, where the belt sticks to the pulley flanges along spiral-shaped paths. It is demonstrated that this type of contact may occur only for the closing pulleys, differently from the steady drives and from the opening pulleys, where only quasiadhesive internal subregions may be observed at most, where the sliding velocity turns out to be quite small along a more or less extended portion of the arc of contact. Numerical solutions are calculated for all types of conditions, and their characteristics are widely described.
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December 2008
Research Papers
A Theoretical Approach to the Shift Mechanics of Rubber Belt Variators
Francesco Sorge
Francesco Sorge
Dipartimento di Meccanica,
e-mail: sorge@dima.unipa.it
Università di Palermo
, Viale delle Scienze, 90128 Palermo, Italy
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Francesco Sorge
Dipartimento di Meccanica,
Università di Palermo
, Viale delle Scienze, 90128 Palermo, Italye-mail: sorge@dima.unipa.it
J. Mech. Des. Dec 2008, 130(12): 122602 (9 pages)
Published Online: November 3, 2008
Article history
Received:
December 6, 2007
Revised:
May 9, 2008
Published:
November 3, 2008
Citation
Sorge, F. (November 3, 2008). "A Theoretical Approach to the Shift Mechanics of Rubber Belt Variators." ASME. J. Mech. Des. December 2008; 130(12): 122602. https://doi.org/10.1115/1.2991140
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