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Your search keyword '"Francesco Sorge"' showing total 2 results
Start Over Author "Francesco Sorge" Publisher american society of mechanical engineers
2 results on '"Francesco Sorge"'

1. Full Sliding 'Adhesive-Like' Contact of V-Belts

Author

Go¨ran Gerbert and Francesco Sorge

Subjects
Power transmission, Engineering, business.product_category, business.industry, Tension (physics), Mechanical Engineering, Mathematical analysis, Belt drive, Type (model theory), Computer Graphics and Computer-Aided Design, Computer Science Applications, Power (physics), Pulley, Contact angle, Mechanics of Materials, Calculus, Boundary value problem, business
Abstract

Analysis of power transmission in a belt drive consisting of e. g. two pulleys might be treated as a boundary value problem. Tight side tension FT, slack side tension FS and the wrap angle α are the three natural boundary conditions. In the literature, theories are developed where seating and unseating as well as the power transmitting part of the contact are considered. The solutions presented so far don’t fulfil the boundary conditions properly, since a certain tension ratio FT/FS is associated with a certain contact angle and not an a priori specified one. It appears that a new type of full sliding solution must be introduced to handle the boundary condition problem. During part of the contact there is almost no tension variation in spite of the full sliding conditions. The designation adhesive like solution is here introduced for that part. Conditions and character of the adhesive like solution are outlined in the paper.

Published
2000
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2. A Theoretical Approach to the Shift Mechanics of Rubber Belt Variators.

Author

Francesco Sorge

Subjects
*BELTS & belting, *MECHANICS (Physics), *MECHANICAL behavior of materials, *RUBBER, *ENGINEERING design, *PULLEYS, *INERTIA (Mechanics), *NUMERICAL analysis, *ENGINEERING models
Abstract

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. [ABSTRACT FROM AUTHOR]

Published
2008
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