Hydraulic transmission system in which the main pump can be permanently activated

The device (20) has a main pump (24) i.e. rotary pump, serving to feed hydraulic motors (26A, 26B) with fluid. An auxiliary pump (25) serves to maintain a minimum fluid pressure in an auxiliary duct. The main pump and the auxiliary pump are actuated jointly by a drive unit (18) for delivering pressu...

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Bibliographische Detailangaben
Hauptverfasser:	HEREN, JEAN, BASSON, BENJAMIN, LUCIENNE, PHILIPPE, PRIGENT, ANDRE
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	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 ENGINEERING ELEMENTS AND UNITS GEARING GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS HEATING INSTRUMENTATION OR DASHBOARDS FOR VEHICLES LIGHTING MECHANICAL ENGINEERING PERFORMING OPERATIONS THERMAL INSULATION IN GENERAL TRANSPORTING VEHICLES IN GENERAL WEAPONS
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Beschreibung
Zusammenfassung:	The device (20) has a main pump (24) i.e. rotary pump, serving to feed hydraulic motors (26A, 26B) with fluid. An auxiliary pump (25) serves to maintain a minimum fluid pressure in an auxiliary duct. The main pump and the auxiliary pump are actuated jointly by a drive unit (18) for delivering pressurized fluid. A bypass connection is formed between a delivery orifice of the auxiliary pump and an unpressurized reservoir (52). Applying units (42) apply a pump protection pressure to main orifices of the main pump when the main pump is actuated while the fluid is not delivered. The drive unit is an internal combustion engine i.e. diesel engine. An independent claim is also included for a transmission system comprising a principal transmission. Système (22) de transmission hydraulique pour un véhicule (10), comportant : - une pompe principale (24) prévue pour alimenter en fluide au moins un moteur hydraulique (26A,26B) entraînant au moins un organe de déplacement (14A, 14B) du véhicule ; - une pompe auxiliaire (25), les pompes principale et auxiliaire étant susceptibles d'être actionnées conjointement par des moyens d'entraînement (18) ; - une liaison (64) dite de bipasse entre un orifice de refoulement de la pompe auxiliaire et un réservoir sans surpression (52). De premiers moyens de restriction (58), agencés sur la liaison de bipasse, maintiennent une pression de protection de pompe dans une partie de protection de pompe de la liaison de bipasse ; cette pression est appliquée aux orifices principaux de la pompe principale lorsque celle-ci est actionnée mais ne débite pas, ce qui assure la protection de la pompe.