Reversible driven pulley

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

Patent

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Details

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

Patent

CA 2328432

The driven pulley (10) is used in a continuously variable transmission (CVT). It comprises a main shaft (12), a fixed flange (14) and a movable flange (16). The first cam system comprises a cam plate (22), provided with cam surfaces (24), and corresponding cam followers (28). The second cam system also comprises a cam plate (40), provided with cam surfaces (42), and corresponding cam followers (46). During a normal forward rotation of the driven pulley (10), corresponding to a forward motion of a vehicle, the first cam system is automatically disabled and the position of the movable flange (16) is governed by the second cam system. However, under motor-braking conditions, the first cam system takes over the control and the second cam system is disabled. Similarly, the first cam system governs the position of the movable flange (16) during a normal reverse rotation of the driven pulley (10) and the second cam system takes over the control under motor-braking conditions as the vehicle is traveling rearwards.

L'invention se rapporte à une poulie d'entraînement (10) mise en oeuvre dans une transmission à changement de vitesses continu (CVT). Cette poulie comporte un axe principal (12), une bride fixe (14) et une bride mobile (16). Un premier système à came comporte une came de commande (22) dotée de surfaces (24) et des galets de came (28) correspondants. Un second système à came comporte également une came de commande (40) dotée de surfaces (42) et des galets de came (46) correspondants. Au cours d'une rotation normale vers l'avant de la poulie d'entraînement (10), qui correspond à un déplacement vers l'avant du véhicule, le premier système à came est automatiquement désactivé et la position de la bride mobile (16) est commandée par le second système à came. Cependant, dans des conditions de débrayage du moteur, le premier système à came assure la commande et le second système à came est désactivé. De manière analogue, le premier système à came commande le positionnement de la bride mobile (16) au cours d'une rotation inverse normale de la poulie d'entraînement (10) et le second système à came assure la commande dans des conditions de débrayage du moteur lorsque le véhicule se déplace vers l'arrière.

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