Tensioner for a power transmission belt and method of making...

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

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

Patent

CA 2245868

A tensioner for a power transmission belt (21) and a method of making same are provided. The tensioner (20, 20A, 20B) includes an arm (36, 36A, 36B) that carries a belt engaging unit (25, 25A, 25B) and is adapted to be pivotably mounted to a support unit (24, 24A, 24B). A mechanical first spring (26, 26A, 26B) is operatively associated with the support unit (24, 24A, 24B) and the arm (36, 36A, 36B) for urging the arm, and hence the belt engaging unit (25, 25A, 25B), relative to the support unit (24, 24A, 24B) and against the belt (21) for tensioning same. A fluidic dampener (28, 28A, 28B) is operatively associated with the support unit (24, 24A, 24B) and the arm (36, 36A, 36B) to dampen movement of the arm relative to the support unit. The dampener (28, 28A, 28B) comprises a first plate (47, 47A, 45B) fixed to the support (24, 24A, 24B) unit, a second plate (45, 45A, 47B) fixed to the arm (36, 36A, 36B) for rotation therewith and relative to the first plate, a second spring (50, 50A, 50B) urging the first and second plates against one another, friction material (72, 72A, 72B) disposed between part of the facing surfaces (55, 56) of the first and second plates, and fluid disposed between the facing surfaces (55, 56) of the first and second plates.

La présente invention concerne un tendeur pour courroie de transmission d'énergie (21) et son procédé de fabrication. Ledit tendeur (20, 20A, 20B) comprend un bras (36, 36A, 36B) muni d'un élément (25, 25A, 25B) entrant en prise avec la courroie, et est conçu pour être monté de façon pivotante sur un élément de support (24, 24A, 24B). Un premier ressort mécanique (26, 26A, 26B) est associé de manière opérative à l'élément de support (24, 24A, 24B) et au bras (36, 36A, 36B) afin de déplacer le bras, et par conséquent l'élément (25, 25A, 25B) entrant en prise avec la courroie, par rapport à l'élément de support (24, 24A, 24B) et contre la courroie (21) en vue de tendre ladite courroie. Un amortisseur fluidique (28, 28A, 28B) est associé de manière opérative à l'élément de support (24, 24A, 24B) et au bras (36, 36A, 36B) afin d'amortir le mouvement du bras par rapport à l'élément de support. Ledit amortisseur (28, 28A, 28B) comprend un premier plateau (47, 47A, 45B) fixé à l'élément de support (24, 24A, 24B), un deuxième plateau (45, 45A, 47B) fixé au bras (36, 36A, 36B) de manière à tourner avec le bras et par rapport au premier plateau, un deuxième ressort (50, 50A, 50B) qui maintient le premier et le deuxième plateaux l'un contre l'autre, un matériau de friction (72, 72A, 72B) placé entre une partie des surfaces en vis-à-vis (55, 56) du premier et du deuxième plateau et un liquide placé entre les surfaces en vis-à-vis (55, 56) du premier et du deuxième plateau.

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