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Machine translation
1. (WO1981000599) VOLUME COMPENSATION FOR HYDRAULIC CIRCUITS
Latest bibliographic data on file with the International Bureau   

Pub. No.:    WO/1981/000599    International Application No.:    PCT/US1979/000645
Publication Date: 05.03.1981 International Filing Date: 23.08.1979
IPC:
F15B 7/10 (2006.01)
Applicants:
Inventors:
Priority Data:
US79/00645 23.08.1979 WO
Title (EN) VOLUME COMPENSATION FOR HYDRAULIC CIRCUITS
(FR) COMPENSATION DE VOLUME POUR CIRCUITS HYDRAULIQUES
Abstract: front page image
(EN)A hydraulic circuit (32), for example, remotely controls a work element (14) and contains first apparatus (34), such as a master cylinder (42), which passes a fluid signal through a first or second fluid pathway (38, 40) in response to an input signal. Second apparatus (36), such as a slave cylinder (44), delivers an output signal in response to the fluid signal for controlling the work element (14). In such a circuit, temperature variation can cause fluid volume changes which disrupt synchronized operation of, for example, the master and slave cylinders (42, 44). Third apparatus (74) positions the fluid pathways (38, 40) in fluid communication with a tank (28) in the absence of the fluid signal. If the signal passes through one pathway (38, 40), that pathway (38, 40) is blocked from the tank (28) and the other pathway (40, 38) is positioned in communication with the tank (28). Thus, a fluid pathway (38, 40) not pressurized for transmitting a fluid signal receives oil volume compensation for substantially overcoming problems of temperature changes.
(FR)Un circuit hydraulique (32), commande a distance, par exemple, un element de travail et contient un premier appareil (34), tel qu"un maitre cylindre (42), qui fait passer un signal de fluide au travers d"un premier ou d, un second passage de fluide (38, 40) en reponse a un signal d"entree. Un second appareil (36), tel qu"un cylindre asservi (44), envoie un signal de sortie en reponse au signal fluide pour commander l"element de travail (14). Dans un tel circuit, la variation de temperature peut provoquer des changements de volume du fluide qui entravent le fonctionnement synchronise du maitre cylindre et du cylindre asservi (42, 44). Un troisieme appareil (74) positionne les passages du fluide (38, 40) pour communiquer avec un reservoir (28) en l"absence du signal de fluide. Si le signal passe au travers d"un passage (38, 40), ce passage (38, 40) est coupe du reservoir (28) et l"autre passage (40, 38) est positionne en communication avec le reservoir (28). Ainsi, un passage de fluide (38, 40) non pressurise de transmission d"un signal de fluide recoit une compensation en volume d"huile pour surmonter les problemes de changements de temperature.
Designated States:
Publication Language: English (EN)
Filing Language: English (EN)