Belt tensioner

F - Mech Eng,Light,Heat,Weapons – 16 – H

Patent

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Details

F16H 7/12 (2006.01) F16H 7/08 (2006.01)

Patent

CA 2421841

The invention is an improved tensioner for tensioning a power transmission belt. The tensioner (26) is of the type having a track, a carrier (46) mounted in sliding relation with the track with two degrees freedom of movement, a pulley (48) rotatably mounted upon the carrier and for engaging the power transmission belt (24), a spring (72) biasing the carrier in longitudinal relation to the track, and a damping mechanism that modifies the biasing of the spring based upon movement of the carrier in relation to the track. It is improved by the damping mechanism having a shoe (66) placed in asymmetrical damping relation to the carrier and the track. Further, the shoe includes a first friction bearing surface in mating relationship with a second friction bearing surface of the track.

L'invention concerne un tendeur perfectionné destiné à tendre une courroie de transmission d'énergie. Le tendeur est pourvu d'une glissière, un support monté par glissement sur la glissière avec deux degrés de liberté de mouvement, une poulie montée de manière rotative sur le support et destinée à venir en contact avec la courroie de transmission d'énergie, un ressort de polarisation du support disposé longitudinalement par rapport à la glissière, et un mécanisme d'amortissement modifiant la polarisation du ressort en fonction du mouvement du support par rapport à la glissière. Le tendeur est amélioré grâce au mécanisme d'amortissement qui est pourvu d'un patin placé en relation d'amortissement asymétrique avec le support et la glissière. Le patin comprend, de plus, un premier coussinet dont la surface vient en contact avec la surface d'un second coussinet de la glissière.

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