Linear tensioner

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

Patent

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Details

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

Patent

CA 2457897

The invention comprises a tensioner having a pulley (1) journaled to a housing (3). The housing further comprises a guide (4). The guide slidingly engages rails (7, 17) on a base (6). The guide and rails constrain the housing to move in a predetermined linear path. The rails are horizontally offset from two axis defined by the pulley. The pulley load is also vertically offset from the axis of movements of the guide. The guide and rails have a predetermined frictional coefficient so that the cumulative result is an asymmetric damping effect. Further, a linkage (8) is connected between the housing and a camming body (9). The camming body is rotatably connected to the base. A biasing member such as a torsion spring (11) biases the camming boy against the belt load through the linkage. The radius of the camming body is variable to maintain a constant belt load as the tensioner pulley moves in response to a load change.

L'invention concerne un dispositif de tension linéaire possédant une poulie (1) montée sur paliers à un boîtier (3). Ce boîtier comprend également un guide (4). Ce guide s'accouple coulissant à des rails (7, 17) sur une base (6). Le guide et les rails forcent le boîtier à se déplacer sur un trajet linéaire prédéterminé. Les rails sont décalés horizontalement depuis deux axes définis par la poulie. La charge de la poulie est également décalée verticalement par rapport à l'axe de déplacement du guide. Le guide et les rails présentent un coefficient de friction prédéterminé, de sorte que le résultat cumulé exerce un effet d'amortissement asymétrique. Une articulation (8) relie, de plus, le boîtier et un corps de came (9). Ce corps de came est accouplé rotatif à la base. Un élément de sollicitation, tel qu'un ressort de torsion (11), sollicite le corps de came contre la charge de la courroie par l'intermédiaire de l'articulation. Le rayon du corps de came est variable, de manière à conserver une charge de courroie constante simultanément au déplacement de la poulie du dispositif de tension en réaction à une variation de charge.

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