Driving pulley for a continuously variable transmission

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

Patent

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Details

F16H 61/00 (2006.01) F16H 55/56 (2006.01) F16H 61/662 (2006.01) F16H 63/06 (2006.01)

Patent

CA 2439356

The driving pulley (10) comprises two centrifugal mechanisms, namely a positive assembly (50) and a negative assembly (80). Both assemblies (50, 80) comprise a respective set of flyweights (62, 92) subjected to the centrifugal force when the driving pulley (10) rotates. The positive assembly (50) is used as a conventional speed governor that moves one of the two flanges (28, 36) of the driving pulley (10) towards the other in order to increase its winding diameter when the rotation speed increases. The negative assembly (80) is used to apply an opposite force on the positive assembly (50) when the rotation speed is above a threshold value so as to defer the upshift of the CVT to a higher ratio under the action of the positive assembly (50). This allows to maintain, for instance, a high rotation speed during an intense acceleration and a lower rotation speed when cruising at low vehicle speeds.

L'invention porte sur une poulie motrice (10) comprenant deux mécanismes centrifuges dont un ensemble positif (50) et un ensemble négatif (80). Ces deux ensembles (50, 80) comportent chacun un ensemble de masselottes (62, 92) soumis à la force centrifuge lorsque la poulie motrice (10) tourne. L'ensemble positif (50) tient lieu de limiteur de régime conventionnel ayant pour mission de déplacer un des deux rebords (28, 36) de la poulie motrice (10) en direction de l'autre rebord de manière à augmenter son diamètre d'enroulement lorsque la vitesse de rotation augmente. L'ensemble négatif (80), quant à lui, sert à exercer une force opposée sur l'ensemble positif (50) lorsque la vitesse de rotation est supérieure à une valeur seuil de manière à retarder le passage à un rapport plus élevé de la transmission à variation continue sous l'effet de l'ensemble positif (50). Aussi, est-il possible de maintenir, par exemple, une vitesse de rotation élevée au cours d'une accélération prononcée et de maintenir une vitesse de rotation inférieure lorsque le véhicule roule à une vitesse de croisière.

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