F - Mech Eng,Light,Heat,Weapons – 16 – H
Patent
F - Mech Eng,Light,Heat,Weapons
16
H
F16H 61/38 (2006.01) F16H 61/662 (2006.01) F16H 61/664 (2006.01)
Patent
CA 2330605
The present invention provides an hydraulic control circuit for a continuously- variable-ratio transmission. An hydraulic control circuit for a CVT transmission includes a first hydraulic pressure control valve V1 for controlling the pressure of hydraulic fluid to be supplied to the roller control pistons of the variator and a second hydraulic pressure control valve V2 for controlling the pressure of hydraulic fluid to be supplied to a clutching arrangement of the transmission. Said valves V1, V2 are connected in flow series and by a first fluid directing valve means V3(S1, S2) for directing flow from each pump PL, PR to a first point P upstream of valve V1 or to a second point P downstream of valve V1 but upstream of valve V2. By adopting such an arrangement it is possible to control the clutches without affecting the roller position and vice versa.
La présente invention concerne un circuit de commande hydraulique pour transmission à changement de vitesse continu, qui comprend une première soupape régulatrice de pression hydraulique V¿1? destinée à réguler la pression du fluide hydraulique fourni aux pistons de commande à galet du variateur et une deuxième soupape régulatrice de pression hydraulique V¿2? destinée à réguler la pression du fluide hydraulique fourni à un mécanisme d'embrayage de la transmission. Ces soupapes V¿1? et V¿2? sont reliées en série par un premier moyen de vanne directrice de fluide V¿3? (S¿1?, S¿2?) qui dirige l'écoulement en provenance de chaque pompe P¿L?, P¿R? vers un premier point P en amont de la soupape V¿1? ou vers un deuxième point P en aval de la soupape V¿1?, mais en amont de la soupape V¿2?. Cette disposition permet de régler les embrayages sans modifier la position du galet et vice versa.
Fetherstonhaugh & Co.
Torotrak (development) Limited
LandOfFree
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