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Machine translation
1. (WO1981002641) PRESSURE REGULATING HYDRAULIC CIRCUIT AND VALVE
Latest bibliographic data on file with the International Bureau   

Pub. No.:    WO/1981/002641    International Application No.:    PCT/US1980/000270
Publication Date: 17.09.1981 International Filing Date: 12.03.1980
IPC:
F16D 48/02 (2006.01), F16D 48/04 (2006.01)
Applicants:
Inventors:
Priority Data:
US80/00270 12.03.1980 WO
Title (EN) PRESSURE REGULATING HYDRAULIC CIRCUIT AND VALVE
(FR) CIRCUIT HYDRAULIQUE DE REGULATION DE PRESSION
Abstract: front page image
(EN)For work vehicles, for example, cold weather can be a problem. Disengaging the vehicle clutch (26) aids starting by reducing engine loads during starting. Where the clutch (26) is hydraulically actuated, it can be disengaged by keeping fluid pressures below required engagement pressure when supplying other elements common to the clutch hydraulic circuit. Apparatus is provided which during starting directs fluid to, for example, pump drive bearings (20) at less than clutch engagement pressure. An input signal to the apparatus from the vehicle operator after engine start-up then builds pressure to activate the clutch (26) while continuing to supply the pump drive bearings (20) for lubrication. Upon a preselected fluid flow to the apparatus, such as at engine shutdown, the apparatus automatically returns to the condition at which available pressure levels are less than required for clutch engagement. Thus, cold starting problems are substantially eliminated by automatically providing a clutch disengaged situation in the vehicle during engine start-up.
(FR)Par temps froid les vehicules peuvent avoir des problemes de demarrage. Le degagement de l"embrayage (26) du vehicule facilite le demarrage en reduisant la charge du moteur pendant le demarrage. Lorsque l"embrayage (26) est actionne hydrauliquement, il peut etre degage en maintenant les pressions du fluide en deca de la pression requise d"engagement pendant l"alimentation d"autres elements communs au circuit hydraulique de l"embrayage. Pendant le demarrage, l"appareil envoie du fluide aux paliers (20) d"entrainement de la pompe a une pression inferieure a la pression d"engagement de l"embrayage. Un signal d"entree envoye a l"appareil par l"operateur du vehicule apres demarrage du moteur fait monter la pression pour actionner l"embrayage (26) tout en continuant a alimenter les paliers (20) d"entrainement de la pompe pour leur lubrification. Avec un debit de fluide preselectionne arrivant a l"appareil, tel qu"a l"arret du moteur, l"appareil revient a l"etat ou des niveaux de pression disponibles sont inferieurs a la pression requise pour embrayer. Ainsi, les problemes de demarrage a froid sont sensiblement elimines en creant automatiquement une situation de debrayage dans le vehicule pendant le demarrage du moteur.
Designated States:
Publication Language: English (EN)
Filing Language: English (EN)