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 2463540

The invention comprises a belt tensioner (100) having a pivot arm (10) biased toward a belt by a torsion spring (30). The tensioner (100) also comprises a one-way clutch (36) coupled with a friction clutch (42). The pivot arm (10) of the tensioner (100) is connected to a one-way clutch (36). The one-way clutch (36) is cooperatively connected to a friction clutch (42) having a predetermined friction torque caused by frictionally engaged radially extending surfaces. The pivot arm may move relatively freely toward a belt by operation of the one-way clutch (36). At the limit of arm movement the one-way clutch (36) engages, preventing travel away from the belt in an opposite direction. The arm (10) may only travel away from the belt when a belt tension torque exceeds the spring (30) force plus a friction torque of the friction clutch (42).

L'invention concerne un tendeur de courroie (100) comprenant un bras pivotant (10) forcé vers une courroie par un ressort de torsion (30). Le tendeur (100) comprend également un embrayage unidirectionnel (36) relié à un embrayage à friction (42). Le bras pivotant (10) du tendeur (100) est relié à un embrayage unidirectionnel (36). L'embrayage unidirectionnel (36) est relié de manière fonctionnelle à un embrayage à friction (42) ayant un couple de frottement prédéterminé généré par des surfaces en prise qui s'étendent radialement. L'embrayage unidirectionnel (36) permet de déplacer le bras pivotant de manière relativement libre vers une courroie. Lorsque le bras atteint son point de déplacement limite, l'embrayage unidirectionnel (36) s'enclenche, ce qui empêche qu'il ne s'éloigne de la courroie dans une direction opposée. Le bras (10) ne peut s'éloigner de la courroie que si le couple de tension de la courroie dépasse la force du ressort (30) ajoutée au couple de friction de l'embrayage à friction (42).

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