Timing belt autotensioner with an anti-tooth skip mechanism

Details Timing belt autotensioner with an anti-tooth skip mechanism Timing belt autotensioner with an anti-tooth skip mechanism

F - Mech Eng,Light,Heat,Weapons

16

H

F16H 7/12 (2006.01) F02B 67/06 (2006.01) F16H 7/08 (2006.01)

Patent

CA 2412859

A timing belt antotensioner includes a mechanism actuated by the reversal of timing belt movement direction. In automotive applications reversal of timing belt direction occurs only rarely under inadvertent or accidental circumstances. Such reversals can cause belt slackening sufficient for a toothed belt to jump gear teeth thereby changing engine cam shaft timing. Four related mechanisms are disclosed, each of which will, upon actuation by belt reversal cause the autotensioner pulley axis of rotation to move in a direction that tightens the belt during reverse movement of the belt. Thus, the belt remains tight to the toothed pulleys preventing jump or skip of the belt until the belt returns to proper forward belt movement.

Tendeur automatique de courroie de distribution qui comporte un mécanisme actionné par l'inversion du sens de mouvement de la courroie de distribution. Dans les applications automobiles, l'inversion du sens de mouvement de la courroie de distribution ne se produit que rarement dans des circonstances non voulues ou accidentelles. Ces inversions de sens peuvent provoquer un relâchement de la courroie suffisant pour qu'une courroie dentée saute des dents de poulie, modifiant ainsi le temps de rotation de l'arbre à cames du moteur. La présente invention concerne quatre mécanismes analogues, dont chacun est destiné, en cas d'actionnement par inversion du sens de mouvement de la courroie, à déplacer l'axe de rotation de la poulie du tendeur automatique dans une direction qui tend la courroie pendant le mouvement inverse de cette dernière. La courroie reste donc serrée contre les poulies dentées, ce qui l'empêche de sauter jusqu'à ce qu'elle retrouve un mouvement approprié vers l'avant.

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