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Machine translation
1. (WO1981002553) HYDRAULIC SERVO STEERING SYSTEM
Latest bibliographic data on file with the International Bureau   

Pub. No.:    WO/1981/002553    International Application No.:    PCT/US1980/000228
Publication Date: 17.09.1981 International Filing Date: 03.03.1980
IPC:
B62D 5/09 (2006.01), B62D 5/32 (2006.01)
Applicants:
Inventors:
Priority Data:
US80/00228 03.03.1980 WO
Title (EN) HYDRAULIC SERVO STEERING SYSTEM
(FR) SYSTEME HYDRAULIQUE DE SERVO DIRECTION
Abstract: front page image
(EN)A hydraulic servo steering system (10) for vehicles has a steering valve (24) for directing fluid to steering cylinders (16, 17) in response to pilot fluid directed to one end of the steering valve (24) from a hand metering unit (31). A servo cylinder (19) directs a volume of fluid to the other end of the steering valve (24) sufficient for returning the steering valve (24) to its centered position in response to turning of the vehicle. A pair of pilot operated check valves (53, 54) positioned in the lines (51 52) between the servo cylinder (19) and the steering valve (24) are opened in response to fluid pressure being established in the lines (51, 52) by a means (71). Should one of the lines (51, 52) rupture, the resultant drop in fluid pressure in the lines (51, 52) causes the check valves (53, 54) to close thereby isolating the steering valve (24) from the ruptured lines (51, 52). Thereafter the steering valve (24) can be operated in a "jerk steer" manner for emergency steering of the vehicle.
(FR)Un systeme hydraulique de servo direction (10) pour des vehicules possede une soupape de direction (24) pour diriger un fluide vers des cylindres de direction (16, 17) en reponse a un fluide pilote dirige vers une extremite de la soupape de direction (24) a partir d"une unite de dosage manuelle (31). Un servo cylindre (19) envoie un volume de fluide a l"autre extremite de la soupape de direction (24) qui est suffisant pour rappeler la soupape de direction (24) vers sa position centrale lorsque le vehicule tourne. Une paire de soupapes pilotes de retenue (53, 54) positionnee dans les canalisations (51, 52) entre le servo cylindre (19) et la soupape de direction (24) sont ouvertes en reponse a la pression du fluide etablie dans les canalisations (51, 52) par des moyens (71). En cas de rupture de l"une des canalisations (51, 52), la baisse resultante de la pression du fluide dans les canalisations (51, 52) provoque la fermeture des soupapes de retenue (53, 54) isolant ainsi la soupape de direction (24) des canalisations rompues (51, 52). Ensuite, la soupape de direction (24) peut fonctionner suivant un mode de secours par a-coups pour conduire le vehicule.
Designated States:
Publication Language: English (EN)
Filing Language: English (EN)