Hydraulic control system for 4-speed automatic transmission

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

Patent

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Details

F16H 61/02 (2006.01) F16H 61/14 (2006.01) F16H 61/00 (2006.01) F16H 61/04 (2006.01) F16H 61/08 (2006.01)

Patent

CA 2142969

A hydraulic control system for 4-speed automatic transmission which is controlled by torque control hydraulic pressure and drive hydraulic pressure in regular succession and can provide a skip shift comprises a fluid pump (320, a pressure regulator valve (34) for the line pressure generated at the fluid pump (32), a plurality of frictional elements (108, 62, 120, 84, 94, 100, 126) actuated by drive hydraulic pressure or reverse hydraulic pressure in accordance with the position of a valve spool of a manual valve (58), a first transmission control portion (D) having at least two valves (78, 86, 98) for supplying hydraulic pressure to at least one of the frictional elements, and a second transmission control portion (E) for selecting at least one of the frictional elements.

Système de commande hydraulique pour une transmission automatique à quatre vitesses commandée par une pression hydraulique de commande de couple et une pression hydraulique de marche avant de manière successive et régulière, et pouvant effectuer un saut de changement de vitesse. Ce système comprend une pompe hydraulique (32), un régulateur de pression (34) permettant de réguler la pression, dans la ligne, générée au niveau de ladite pompe (32), une pluralité d'éléments à friction (108, 62, 120, 84, 94, 100, 126) actionnés par la pression hydraulique de marche avant ou une pression hydraulique de marche arrière en fonction de la position d'une bague d'une soupape manuelle (58), une première partie de commande de transmission (D) comprenant au moins deux soupapes (78, 86, 98) d'alimentation en pression hydraulique d'au moins l'un des éléments à friction, ainsi qu'une seconde partie de commande de transmission (E) permettant de sélectionner au moins l'un des éléments à friction.

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