Belt tensioner with wear compensation

Details Belt tensioner with wear compensation Belt tensioner with wear compensation

F - Mech Eng,Light,Heat,Weapons

16

H

F16H 7/12 (2006.01)

Patent

CA 2601901

A novel tensioner for use with flexible drives, such as serpentine accessory belts on automobiles includes a tensioner arm to spindle pivot design which employs a frustoconical bushing between an inner pivot surface of the tensioner arm and a spindle shaft. The frustoconical design of the bushing resists off axis movement of the tensioner arm and a wear take up mechanism biases the bushing into contact with the inner pivot surface to compensate for normal wear of the bushing and/or pivot surface. A thrust plate is mounted to the end of the spindle shaft and rides in a thrust washer, the thrust plate and thrust washer being held captive in the tensioner arm such that the tensioner arm can pivot about the bushing and the spindle and the thrust plate and thrust washer assist in inhibiting off-axis movement of the tensioner arm. In one embodiment, the biasing force which biases the bushing against the inner pivot surface of the tensioner arm can be varied to change the amount of dampening of the tensioner.

L~invention a pour objet un tendeur de courroie innovant destiné à un usage avec des éléments de transmission flexibles telles des courroies multifonctions d~automobiles et comprenant un bras de tendeur tenant lieu de pivot de broche et utilisant un coussinet tronconique entre sa surface de pivot interne et un arbre de broche. La forme tronconique du coussinet résiste aux mouvements hors de son axe du bras de tendeur tandis qu~un mécanisme de rattrapage d~usure maintient le coussinet en contact avec la surface de pivot interne pour compenser l~usure normale du coussinet et/ou de la surface de pivot. Une plaque de poussée est fixée à l~extrémité de l~arbre de broche et avance dans un anneau de butée, tous deux étant maintenus prisonniers dans le bras de tendeur de manière à ce qu~il puisse pivoter autour du coussinet et de la broche et que la plaque de poussée et l~anneau de butée contribuent à inhiber ses mouvements hors de son axe. Selon l~un des modes de réalisation, la force de contrainte qui maintient le coussinet contre la surface de pivot interne du bras de tendeur peut être modifiée pour modifier l~amortissement du tendeur.

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