Pressurized hydraulic fluid system with remote charge pump

F - Mech Eng,Light,Heat,Weapons – 15 – B

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F15B 11/17 (2006.01) F16H 45/00 (2006.01)

Patent

CA 2549910

A pressurized hydraulic fluid system includes a charge pump (16), a hydraulic motor (24) drivingly coupled to the charge pump, and a main hydraulic unit (12) adapted to function as a pump to drive the hydraulic motor. The charge pump (16) is in fluid communication with the main hydraulic unit (12) for maintaining a sufficient inlet pressure in the main hydraulic unit (12) when it functions as the pump. The system further includes a hydraulic fluid reservoir (20) in fluid communication with an inlet of the charge pump, a hydraulic accumulator (22) in fluid communication with the main hydraulic unit, and a return flow passage (11) fluidly connecting the main hydraulic unit with the hydraulic fluid reservoir (20) for returning an excess flow of the hydraulic fluid generated by the charge pump (16) to the hydraulic fluid reservoir (20).

L'invention concerne un système de fluide hydraulique sous pression qui comprend une pompe de charge (16), un moteur hydraulique (24) raccordé par entraînement à la pompe de charge, et une unité hydraulique principale (12) conçue pour faire office de pompe afin d'entraîner le moteur hydraulique. La pompe de charge (16) est en communication fluidique avec l'unité hydraulique principale (12) afin de maintenir une pression d'entrée suffisante dans l'unité hydraulique principale (12) lorsque cette dernière fait office de pompe. Le système de l'invention comprend en outre un réservoir de fluide hydraulique (20) en communication fluidique avec une entrée de la pompe de charge, un accumulateur hydraulique (22) en communication fluidique avec l'unité hydraulique principale, et un passage de flux de retour (11) assurant une communication fluidique entre l'unité hydraulique principale et le réservoir de fluide hydraulique (20) afin de renvoyer un flux excédentaire du fluide hydraulique généré par la pompe de charge (16) au réservoir de fluide hydraulique (20).

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