Hydraulically controlled cone pulley belt transmission

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

Patent

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Details

F16H 9/14 (2006.01) F16H 55/56 (2006.01) F16H 61/662 (2006.01) F16H 61/12 (2006.01)

Patent

CA 2237237

A continuously variable cone pulley transmission with pairs of cone pulleys disposed on the drive shaft and power takeoff shaft, whose spacing is adjustable in each case hydraulically with the aid of pressure cylinders, as a result of which the wrapping means revolving between them can be set to different orbits, and a continuously variable transmission ratio setting is thus made possible. The pressure medium required for the hydraulic actuation is allocated to the pressure cylinder by a pump via a control valve. This control valve is hydraulically actuated by a pressure furnished as needed via a proportional pressure reducing valve. If the proportional pressure reducing valve should fail, thus causing a failure of the control pressure, an additional device prevents the control valve from issuing a command for a sudden change of transmission ratio to an extreme position.

Cette invention concerne une transmission à variation continue des vitesses à paires de poulies coniques montées respectivement sur l'arbre de transmission et l'arbre de prise de force, l'espacement des poulies étant réglable au moyen de vérins hydrauliques pour modifier de façon continue la position de la courroie dans la gorge des poulies et ainsi changer de façon continue le rapport de démultiplication. Le liquide sous pression nécessaire à la commande hydraulique des vérins provient d'une pompe, le débit étant réglé par un régulateur à commande hydraulique asservie à la pression de sortie d'un détendeur à loi proportionnelle. En cas de défectuosité du détendeur proportionnel menant au dérèglement de la pression de commande, un dispositif additionnel empêche le régulateur de commander un passage subit à un rapport de démultiplication extrême.

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