초록 ▼

A unit for supplying fuel to an endothermal engine, the unit comprising a manifold to which injectors are connected in order to supply fuel to the engine, a high pressure pumping device which has its output connected to the manifold and its intake connected to an extraction pump adapted to transfer

A unit for supplying fuel to an endothermal engine, the unit comprising a manifold to which injectors are connected in order to supply fuel to the engine, a high pressure pumping device which has its output connected to the manifold and its intake connected to an extraction pump adapted to transfer fuel from the storage tank to this device and a pressure regulator adapted to regulate the pressure of the fuel supplied to the pumping device by supplying surplus fuel along a bleed duct communicating with the tank, the pumping device having at least one piston moving axially within a respective cylinder in order to define a variable volume pumping chamber. The supply unit has a leakage channel provided with a first mouth communicating with the cylinder below the pumping chamber and a second mouth communicating with the bleed duct, and an ejector disposed in the bleed duct at the location of the second mouth in order to recall along the leakage channel fuel leaking from the pumping chamber between the piston and the cylinder.

대표청구항 ▼

[ What is claimed is:] [1.] A unit for supplying fuel to at least one combustion chamber of an endothermal engine, the supply unit comprising, a fuel manifold; at least one injector unit connected to this fuel manifold in order to supply, on command, a predetermined quantity of fuel to the combustio

[ What is claimed is:] [1.] A unit for supplying fuel to at least one combustion chamber of an endothermal engine, the supply unit comprising, a fuel manifold; at least one injector unit connected to this fuel manifold in order to supply, on command, a predetermined quantity of fuel to the combustion chamber; a fuel storage tank; a high pressure pumping device, which has its outlet connected to the fuel manifold (4) and its intake connected to the tank and in turn comprises a body provided with at least one seat and a respective piston mounted in an axially sliding manner within the seat in order to define a variable volume pumping chamber, at least one leakage channel, which has a first end mouth communicating with the seat and disposed in an axially offset position with respect to the first pumping chamber, extending externally to the body; and recall means adapted to supply the fuel leaking from the pumping chamber along the leakage channel via this first end mouth; said supply unit further comprising a bleed duct along, which fuel is conveyed to the tank, the leakage channel having a second end mouth communicating with the bleed duct, the recall means comprising an ejector disposed along said bleed duct at the location of said second mouth, said supply unit further comprising a low pressure pump adapted to take fuel from the tank in order to supply this fuel to the intake of the high pressure pumping device, and a pressure regulator interposed between the pumping device and the low pressure pump in order to regulate the pressure of the fuel supplied to the intake, the pressure regulator being connected to the tank via the bleed duct in order to supply the surplus fuel from the pump along this bleed duct, the ejector being adapted to recall the fuel leaking, from the pumping chamber when it is traversed by a flow of fuel from the pressure regulator and being adapted to supply the leaked fuel to the tank.