DUAL PUMP DUAL PRESSURE HYDRAULIC CIRCUIT

A hydraulic system is provided for an engine driven vehicle. The hydraulic system includes a higher pressure engine driven pump for supplying pressuriz ed fluid to a higher pressure circuit via a first supply line. The system also includes a lower pressure engine driven pump for supplying lower pres...

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Bibliographische Detailangaben
Hauptverfasser:	SPARKS, GREGORY EVAN, EMMERT, ROBERT CLAYTON, DOSTAL, GARY LEE
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	AGRICULTURE ANIMAL HUSBANDRY ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS INVEHICLES ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OFTRANSMISSIONS IN VEHICLES ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GASEXHAUST OR FUEL SUPPLY OF PROPULSION UNITS, IN VEHICLES AUXILIARY DRIVES FOR VEHICLES BLASTING DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR ENGINEERING ELEMENTS AND UNITS FISHING FLUID-PRESSURE ACTUATORS FLUID-PRESSURE ACTUATORS, e.g. SERVO-MOTORS FORESTRY GEARING GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS HEATING HUMAN NECESSITIES HUNTING HYDRAULICS OR PNEUMATICS IN GENERAL INSTRUMENTATION OR DASHBOARDS FOR VEHICLES LIGHTING MECHANICAL ENGINEERING PARTS, DETAILS, OR ACCESSORIES OF AGRICULTURAL MACHINES ORIMPLEMENTS, IN GENERAL PERFORMING OPERATIONS SOIL WORKING IN AGRICULTURE OR FORESTRY SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL THERMAL INSULATION IN GENERAL TRANSPORTING TRAPPING VEHICLES IN GENERAL WEAPONS
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Beschreibung
Zusammenfassung:	A hydraulic system is provided for an engine driven vehicle. The hydraulic system includes a higher pressure engine driven pump for supplying pressuriz ed fluid to a higher pressure circuit via a first supply line. The system also includes a lower pressure engine driven pump for supplying lower pressure fluid to a lower pressure circuit via a second supply line. The system also includes a pressu re responsive relief valve. The relief valve has a sensing port connected to th e first supply line, an inlet connected to the first supply line, and an outlet connected to the second circuit via the second supply line. The relief valve opens when a demand of the higher pressure circuit is satisfied. A cut-off valve controls communication between the high pressure circuit and a reservoir, and a control unit contro ls the cut--off valve as a function of operation of the high pressure circuit.