EP2652328B1 - Pump unit for feeding fuel, preferably diesel fuel, from a storage tank to an internal combustion engine - Google Patents

Pump unit for feeding fuel, preferably diesel fuel, from a storage tank to an internal combustion engine Download PDF

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Publication number
EP2652328B1
EP2652328B1 EP11797236.4A EP11797236A EP2652328B1 EP 2652328 B1 EP2652328 B1 EP 2652328B1 EP 11797236 A EP11797236 A EP 11797236A EP 2652328 B1 EP2652328 B1 EP 2652328B1
Authority
EP
European Patent Office
Prior art keywords
line
fuel
venturi pipe
pump unit
pump
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP11797236.4A
Other languages
German (de)
French (fr)
Other versions
EP2652328A1 (en
Inventor
Salvatore Palmisano
Daniele De Gennaro
Nello Medoro
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
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Robert Bosch GmbH
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Publication date
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Publication of EP2652328A1 publication Critical patent/EP2652328A1/en
Application granted granted Critical
Publication of EP2652328B1 publication Critical patent/EP2652328B1/en
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04BPOSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/04Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04BPOSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/22Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by means of valves
    • F04B49/225Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by means of valves with throttling valves or valves varying the pump inlet opening or the outlet opening
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M37/00Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/0011Constructional details; Manufacturing or assembly of elements of fuel systems; Materials therefor
    • F02M37/0023Valves in the fuel supply and return system
    • F02M37/0029Pressure regulator in the low pressure fuel system
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M37/00Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/0047Layout or arrangement of systems for feeding fuel
    • F02M37/0052Details on the fuel return circuit; Arrangement of pressure regulators
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M37/00Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/02Feeding by means of suction apparatus, e.g. by air flow through carburettors
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M37/00Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/02Feeding by means of suction apparatus, e.g. by air flow through carburettors
    • F02M37/025Feeding by means of a liquid fuel-driven jet pump
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M37/00Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/04Feeding by means of driven pumps
    • F02M37/18Feeding by means of driven pumps characterised by provision of main and auxiliary pumps
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M37/00Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/20Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines characterised by means for preventing vapour lock
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M55/00Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M59/00Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/02Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M59/00Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/20Varying fuel delivery in quantity or timing
    • F02M59/36Varying fuel delivery in quantity or timing by variably-timed valves controlling fuel passages to pumping elements or overflow passages
    • F02M59/366Valves being actuated electrically
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M59/00Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/44Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M59/00Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/44Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
    • F02M59/447Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston means specially adapted to limit fuel delivery or to supply excess of fuel temporarily, e.g. for starting of the engine
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M63/00Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/02Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04BPOSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/04Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
    • F04B1/0404Details or component parts
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04BPOSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/22Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by means of valves
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M59/00Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/02Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
    • F02M59/04Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by special arrangement of cylinders with respect to piston-driving shaft, e.g. arranged parallel to that shaft or swash-plate type pumps
    • F02M59/06Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by special arrangement of cylinders with respect to piston-driving shaft, e.g. arranged parallel to that shaft or swash-plate type pumps with cylinders arranged radially to driving shaft, e.g. in V or star arrangement
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M59/00Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/02Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
    • F02M59/08Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by two or more pumping elements with conjoint outlet or several pumping elements feeding one engine cylinder

Definitions

  • the present invention relates to a pump unit for feeding fuel, preferably diesel fuel, from a storage tank to an internal combustion engine.
  • fuel preferably diesel fuel
  • a pump unit according to the preamble of claim 1 is known from the document DE 101 54 133 C1 .
  • the pump unit comprises a pre-feed pump, a high-pressure pump and a hydraulic circuit.
  • the hydraulic circuit comprises, in turn, a first line for connecting together the storage tank and the pre-feed pump, a second line for connecting together the pre-feed pump and the high-pressure pump, a third line for connecting together the high-pressure pump and the internal combustion engine, a fourth line for connecting together the second line and the storage tank and a fifth line for connecting together the second and fourth lines.
  • the hydraulic circuit further comprises a Venturi pipe which defines part of the fourth line and communicates hydraulically with the fifth line.
  • the Venturi pipe comprises a first inlet for receiving the fuel from the fourth line, a second inlet for receiving the fuel from the fifth line and an outlet for the fuel in said fourth line.
  • the Venturi pipe needs to be fixed in a component of the pump unit.
  • the pump unit according to claim 1 has the advantage that it is simple and inexpensive to produce and that fuel is prevented from seeping into the second inlet passing between the Venturi pipe and the fourth line as the second inlet is formed downstream of the joining portion of the Venturi pipe.
  • 1 denotes, in its entirety, a pump unit for feeding fuel, in particular diesel fuel, from a storage tank 2 to an internal combustion engine 3, in the case in question a Diesel combustion engine comprising a fuel distribution manifold 4, commonly indicated by the term “common rail”, and a plurality of injectors 5 which are connected to the manifold 4 and designed to spray the fuel inside associated combustion chambers (not shown) of the said engine 3.
  • a Diesel combustion engine comprising a fuel distribution manifold 4, commonly indicated by the term “common rail”, and a plurality of injectors 5 which are connected to the manifold 4 and designed to spray the fuel inside associated combustion chambers (not shown) of the said engine 3.
  • the pump unit 1 comprises a high-pressure pump 6, in the case in question a piston pump, designed to feed the fuel to the engine 3, and a low-pressure or pre-feed pump 7, in the case in question a gear pump, designed to feed the fuel from the tank 2 to the pump 6.
  • the pump 6 comprises a pump body 8 with a given longitudinal axis 9, and a plurality of cylinders 10 (in the case in question two cylinders 10), which are formed in the pump body 8, are uniformly distributed around the axis 9 and have respective longitudinal axes substantially perpendicular to the said axis 9 and which are each engaged slidably by a respective piston 12.
  • the pistons 12 are displaced along the associated cylinders 10 by an actuating device 13 of the known type housed inside the pump body 8, with a reciprocating rectilinear movement, comprising an outward stroke for intake of the fuel into the associated cylinders 10 and a return stroke for compressing the fuel contained inside said associated cylinders 10.
  • the pump unit 1 also comprises a hydraulic circuit 14 for feeding the fuel, comprising, in turn, a first line 15 for connecting together the tank 2 and the pump 7, a second line 16, which connects together the pumps 6 and 7, extends through the pump body 8 in order to lubricate the actuating device 13, and is connected to each cylinder 10 via an associated intake valve 17, and a third line 18, which extends between the pump 6 and the manifold 4, and is connected to each cylinder 10 by means of an associated delivery valve 19.
  • a hydraulic circuit 14 for feeding the fuel comprising, in turn, a first line 15 for connecting together the tank 2 and the pump 7, a second line 16, which connects together the pumps 6 and 7, extends through the pump body 8 in order to lubricate the actuating device 13, and is connected to each cylinder 10 via an associated intake valve 17, and a third line 18, which extends between the pump 6 and the manifold 4, and is connected to each cylinder 10 by means of an associated delivery valve 19.
  • the line 16 is provided with a metering solenoid valve 20 which is mounted upstream of the valves 17 in a direction 21 of flow of the fuel along the sections 15, 16 and 18, is movable between a closed position and an open position, and is designed to control selectively the instantaneous flowrate of the fuel fed to the pump 6 depending on the values of a plurality of operating parameters of the engine 3.
  • a metering solenoid valve 20 which is mounted upstream of the valves 17 in a direction 21 of flow of the fuel along the sections 15, 16 and 18, is movable between a closed position and an open position, and is designed to control selectively the instantaneous flowrate of the fuel fed to the pump 6 depending on the values of a plurality of operating parameters of the engine 3.
  • the circuit 14 also comprises a fourth line 22 which extends between the manifold 4 and the tank 2 and is provided with a metering solenoid valve 23, which cooperates with the solenoid valve 20 so as to control selectively the flowrate of the fuel fed to the injectors 5 and allows discharging into the tank 2 of the fuel flow exceeding that required for the injectors 5.
  • the circuit 14 also has a fifth line 24, which connects the line 16 upstream of the solenoid valve 20 in the direction 21 to the line 22 and allows discharging, into the line 22 and therefore into the tank 2, of at least part of the fuel flow exceeding that fed through the said solenoid valve 20.
  • the line 24 has a given longitudinal axis 25, comprises a widened section 26 and a narrow section 27 connected together at an end-of-travel shoulder 28 at right angles to the axis 25 and is provided with an overflow valve 29.
  • the valve 29 has an inlet 29a for receiving the fuel from the line 24, a first outlet 29b for the fuel in the line 24 and a second outlet 29c for the fuel in a line 30 of the circuit 14 extending between the valve 29 and the line 15.
  • the valve 29 is also configured to open only the outlet 29b when the flowrate of the fuel fed along the line 24 is less than a given threshold value and to open the two outlets 29b and 29c when the flowrate of the fuel fed along the line 24 is at least equal to the threshold value itself.
  • the circuit 14 also comprises a Venturi pipe 31 which is mounted in the section 26 downstream of the valve 29 in a direction 32 of flow of the fuel along the line 24 and is provided with a central hole 33 which extends through the pipe 31 coaxially with respect to the axis 25 and comprises a frustoconical inlet portion 33a converging in the direction 32, a frustoconical outlet portion 33b diverging in the direction 32 and a cylindrical intermediate portion 33c extending between the portions 33a and 33b.
  • a Venturi pipe 31 which is mounted in the section 26 downstream of the valve 29 in a direction 32 of flow of the fuel along the line 24 and is provided with a central hole 33 which extends through the pipe 31 coaxially with respect to the axis 25 and comprises a frustoconical inlet portion 33a converging in the direction 32, a frustoconical outlet portion 33b diverging in the direction 32 and a cylindrical intermediate portion 33c extending between the portions 33a and 33b.
  • the pipe 31 also has a radial calibrated hole 34 which is formed in a middle point of the pipe 31 transversely with respect to the axis 25, communicates with the portion 33c of the hole 33 and also communicates with a further line 35 of the circuit 14 in turn connected to the line 16 downstream of the solenoid valve 20 in the direction 21.
  • the pipe 31 Since the pressure of the fuel in the portion 33c is relatively low and less than the pressure of the fuel in the line 35, the pipe 31 is able to take in the fuel flow which seeps through the solenoid valve 20 when said solenoid valve 20 is closed. Since the line 35 is always connected to the line 16 and to the hole 34 it should be pointed out that the pipe 31 also takes in part of the fuel flow fed through the solenoid valve 20 when the solenoid valve 20 is open and the hole 34 is configured to keep below a given threshold value the quantity of fuel taken in by the pipe 31 when the solenoid valve 20 is open.
  • the section 26 and the pipe 31 have respective joining portions 39 which are formed on the inner surface of the section 26 and on the outer surface of the pipe 31, respectively, and are joined together in a fluid-tight manner by means of respective gas threads 37.
  • the pipe 31 is screwed into the section 26 so as to be arranged in contact with the shoulder 28 and be joined in a fluid-tight manner to the shoulder 28 itself and has a polygonal hollow head 38 which is formed inside the hole 33 upstream of the portion 33a in the direction 32 and allows an Allen key (known and not shown) to screw/unscrew the pipe 31 into/from said line 24.

Description

  • The present invention relates to a pump unit for feeding fuel, preferably diesel fuel, from a storage tank to an internal combustion engine.
  • A pump unit according to the preamble of claim 1 is known from the document DE 101 54 133 C1 . The pump unit comprises a pre-feed pump, a high-pressure pump and a hydraulic circuit. The hydraulic circuit comprises, in turn, a first line for connecting together the storage tank and the pre-feed pump, a second line for connecting together the pre-feed pump and the high-pressure pump, a third line for connecting together the high-pressure pump and the internal combustion engine, a fourth line for connecting together the second line and the storage tank and a fifth line for connecting together the second and fourth lines. The hydraulic circuit further comprises a Venturi pipe which defines part of the fourth line and communicates hydraulically with the fifth line. The Venturi pipe comprises a first inlet for receiving the fuel from the fourth line, a second inlet for receiving the fuel from the fifth line and an outlet for the fuel in said fourth line. The Venturi pipe needs to be fixed in a component of the pump unit.
  • A similar pump unit is known from the document DE 199 56 093 A1 . From the documents US 5 937 909 A and US 5 123 452 A throttle elements are known which are screwed in a conduit of a component.
  • The pump unit according to claim 1 has the advantage that it is simple and inexpensive to produce and that fuel is prevented from seeping into the second inlet passing between the Venturi pipe and the fourth line as the second inlet is formed downstream of the joining portion of the Venturi pipe.
  • The present invention will now be described with reference to the accompanying drawings which illustrate a non-limiting example of embodiment thereof in which:
    • Figure 1 is a hydraulic diagram of a preferred embodiment of the pump unit according to the present invention; and
    • Figure 2 is a longitudinally sectioned view of a detail of the pump unit according to Figure 1.
  • With reference to Figure 1, 1 denotes, in its entirety, a pump unit for feeding fuel, in particular diesel fuel, from a storage tank 2 to an internal combustion engine 3, in the case in question a Diesel combustion engine comprising a fuel distribution manifold 4, commonly indicated by the term "common rail", and a plurality of injectors 5 which are connected to the manifold 4 and designed to spray the fuel inside associated combustion chambers (not shown) of the said engine 3.
  • The pump unit 1 comprises a high-pressure pump 6, in the case in question a piston pump, designed to feed the fuel to the engine 3, and a low-pressure or pre-feed pump 7, in the case in question a gear pump, designed to feed the fuel from the tank 2 to the pump 6.
  • The pump 6 comprises a pump body 8 with a given longitudinal axis 9, and a plurality of cylinders 10 (in the case in question two cylinders 10), which are formed in the pump body 8, are uniformly distributed around the axis 9 and have respective longitudinal axes substantially perpendicular to the said axis 9 and which are each engaged slidably by a respective piston 12.
  • The pistons 12 are displaced along the associated cylinders 10 by an actuating device 13 of the known type housed inside the pump body 8, with a reciprocating rectilinear movement, comprising an outward stroke for intake of the fuel into the associated cylinders 10 and a return stroke for compressing the fuel contained inside said associated cylinders 10.
  • The pump unit 1 also comprises a hydraulic circuit 14 for feeding the fuel, comprising, in turn, a first line 15 for connecting together the tank 2 and the pump 7, a second line 16, which connects together the pumps 6 and 7, extends through the pump body 8 in order to lubricate the actuating device 13, and is connected to each cylinder 10 via an associated intake valve 17, and a third line 18, which extends between the pump 6 and the manifold 4, and is connected to each cylinder 10 by means of an associated delivery valve 19.
  • The line 16 is provided with a metering solenoid valve 20 which is mounted upstream of the valves 17 in a direction 21 of flow of the fuel along the sections 15, 16 and 18, is movable between a closed position and an open position, and is designed to control selectively the instantaneous flowrate of the fuel fed to the pump 6 depending on the values of a plurality of operating parameters of the engine 3.
  • The circuit 14 also comprises a fourth line 22 which extends between the manifold 4 and the tank 2 and is provided with a metering solenoid valve 23, which cooperates with the solenoid valve 20 so as to control selectively the flowrate of the fuel fed to the injectors 5 and allows discharging into the tank 2 of the fuel flow exceeding that required for the injectors 5.
  • The circuit 14 also has a fifth line 24, which connects the line 16 upstream of the solenoid valve 20 in the direction 21 to the line 22 and allows discharging, into the line 22 and therefore into the tank 2, of at least part of the fuel flow exceeding that fed through the said solenoid valve 20.
  • The line 24 has a given longitudinal axis 25, comprises a widened section 26 and a narrow section 27 connected together at an end-of-travel shoulder 28 at right angles to the axis 25 and is provided with an overflow valve 29.
  • The valve 29 has an inlet 29a for receiving the fuel from the line 24, a first outlet 29b for the fuel in the line 24 and a second outlet 29c for the fuel in a line 30 of the circuit 14 extending between the valve 29 and the line 15.
  • The valve 29 is also configured to open only the outlet 29b when the flowrate of the fuel fed along the line 24 is less than a given threshold value and to open the two outlets 29b and 29c when the flowrate of the fuel fed along the line 24 is at least equal to the threshold value itself.
  • In accordance with that shown in Figures 1 and 2, the circuit 14 also comprises a Venturi pipe 31 which is mounted in the section 26 downstream of the valve 29 in a direction 32 of flow of the fuel along the line 24 and is provided with a central hole 33 which extends through the pipe 31 coaxially with respect to the axis 25 and comprises a frustoconical inlet portion 33a converging in the direction 32, a frustoconical outlet portion 33b diverging in the direction 32 and a cylindrical intermediate portion 33c extending between the portions 33a and 33b.
  • The pipe 31 also has a radial calibrated hole 34 which is formed in a middle point of the pipe 31 transversely with respect to the axis 25, communicates with the portion 33c of the hole 33 and also communicates with a further line 35 of the circuit 14 in turn connected to the line 16 downstream of the solenoid valve 20 in the direction 21.
  • Since the pressure of the fuel in the portion 33c is relatively low and less than the pressure of the fuel in the line 35, the pipe 31 is able to take in the fuel flow which seeps through the solenoid valve 20 when said solenoid valve 20 is closed. Since the line 35 is always connected to the line 16 and to the hole 34 it should be pointed out that the pipe 31 also takes in part of the fuel flow fed through the solenoid valve 20 when the solenoid valve 20 is open and the hole 34 is configured to keep below a given threshold value the quantity of fuel taken in by the pipe 31 when the solenoid valve 20 is open.
  • The section 26 and the pipe 31 have respective joining portions 39 which are formed on the inner surface of the section 26 and on the outer surface of the pipe 31, respectively, and are joined together in a fluid-tight manner by means of respective gas threads 37.
  • The pipe 31 is screwed into the section 26 so as to be arranged in contact with the shoulder 28 and be joined in a fluid-tight manner to the shoulder 28 itself and has a polygonal hollow head 38 which is formed inside the hole 33 upstream of the portion 33a in the direction 32 and allows an Allen key (known and not shown) to screw/unscrew the pipe 31 into/from said line 24.
  • In connection with the above description it should be pointed out that:
    • the fluid-tight connections between the gas threads 37 and between the shoulder 28 and the pipe 31 prevent the fuel from seeping between the sections 26 and 27 of the line 24 and the pipe 31, allowing the pipe 31 to take in the fuel through the hole 34; and the gas threads 37 allow the pipe 31 to be mounted in a relatively simple and low-cost manner in the line 24.

Claims (6)

  1. Pump unit for feeding fuel, preferably diesel fuel, from a storage tank (2) to an internal combustion engine (3), the pump unit comprising a pre-feed pump (7); a high-pressure pump (6); a hydraulic circuit (14) comprising, in turn, a first line (15) for connecting together the storage tank (2) and the pre-feed pump (7), a second line (16) for connecting together the pre-feed pump (7) and the high-pressure pump (6), a third line (18) for connecting together the high-pressure pump (6) and the internal combustion engine (3), a fourth line (24) for connecting together the second line (16) and the storage tank (2) and a fifth line (35) for connecting together the second and fourth lines (16, 24); and a Venturi pipe (31) which defines part of the fourth line (24) and communicates hydraulically with the fifth line (35); and being characterized in that the Venturi pipe (31) is screwed into the fourth line (24), that the fourth line (24) and the Venturi pipe (31) comprise respective joining portions (36) which are formed on the inner surface of the fourth line (24) and on the outer surface of the Venturi pipe (31), respectively, and are joined together in a fluid-tight manner by means of respective gas threads (37), that the Venturi pipe (31) comprises a first inlet (33a) for receiving the fuel from the fourth line (24), a second inlet (34) for receiving the fuel from the fifth line (35) and an outlet (33b) for the fuel in said fourth line (24) and that the second inlet (34) is formed downstream of the joining portion (36) of the Venturi pipe (31) in a direction of flow (32) of the fuel along the fourth line (24).
  2. Pump unit according to Claim 1, wherein the Venturi pipe (31) is provided with a central hole (33) which extends through the Venturi pipe (31), coaxially with respect to a longitudinal axis (25) of the fourth line (24), so as to define the first inlet (33a) and the outlet (33b); the second inlet (34) extending radially through the Venturi pipe (31) so as to communicate hydraulically with the central hole (33).
  3. Pump unit according to any one of the preceding claims, wherein the fourth line (24) comprises a widened portion (26) and a narrow portion (27) which are arranged in succession with each other and are connected together at an end-of-travel shoulder (28) which is substantially at right angles to a longitudinal axis (25) of said fourth line (24); the Venturi pipe (31) being screwed into said widened portion (26) so as to be arranged in contact with and be joined in a fluid-tight manner to said end-of-travel shoulder (28).
  4. Pump unit according to any one of the preceding claims, wherein the Venturi pipe (31) has a polygonal head (38) suitable for engagement by an operating spanner.
  5. Pump unit according to any one of the preceding claims and also comprising an overflow valve (29) arranged along the fourth line (24) upstream of the Venturi pipe (31) in a direction of flow (32) of the fuel along said fourth line (24).
  6. Pump unit according to any one of the preceding claims, wherein the hydraulic circuit (14) also comprises a metering solenoid valve (20) mounted along the second line (16); the fourth line (24) and the fifth line (35) being connected to the second line (16) upstream and downstream, respectively, of the metering solenoid valve (20) in a direction of flow (21) of the fuel along the said second line (16).
EP11797236.4A 2010-12-16 2011-12-14 Pump unit for feeding fuel, preferably diesel fuel, from a storage tank to an internal combustion engine Not-in-force EP2652328B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI2010A002310A IT1403264B1 (en) 2010-12-16 2010-12-16 PUMPING GROUP FOR FOOD FUEL, PREFERIBLY GASOIL, FROM A CONTAINMENT TANK TO AN INTERNAL COMBUSTION ENGINE
PCT/EP2011/072757 WO2012080334A1 (en) 2010-12-16 2011-12-14 Pump unit for feeding fuel, preferably diesel fuel, from a storage tank to an internal combustion engine

Publications (2)

Publication Number Publication Date
EP2652328A1 EP2652328A1 (en) 2013-10-23
EP2652328B1 true EP2652328B1 (en) 2014-09-17

Family

ID=43736965

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11797236.4A Not-in-force EP2652328B1 (en) 2010-12-16 2011-12-14 Pump unit for feeding fuel, preferably diesel fuel, from a storage tank to an internal combustion engine

Country Status (7)

Country Link
EP (1) EP2652328B1 (en)
JP (1) JP2014503737A (en)
KR (1) KR20130141594A (en)
CN (1) CN103261683B (en)
IT (1) IT1403264B1 (en)
RU (1) RU2013132614A (en)
WO (1) WO2012080334A1 (en)

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ITMI20131923A1 (en) * 2013-11-20 2015-05-21 Bosch Gmbh Robert PUMPING GROUP FOR FOOD FUEL, PREFERIBLY GASOIL, FROM A CONTAINMENT TANK TO AN INTERNAL COMBUSTION ENGINE
DE102013226649A1 (en) * 2013-12-19 2015-06-25 Robert Bosch Gmbh Fuel supply device of a fuel injection system of an internal combustion engine and overflow valve to it
EP3204642B1 (en) * 2014-10-09 2019-06-19 Robert Bosch GmbH Pump unit for supplying fuel, preferably diesel oil, to an internal combustion engine
JP6533290B2 (en) * 2014-12-24 2019-06-19 ロベルト・ボッシュ・ゲゼルシャフト・ミト・ベシュレンクテル・ハフツングRobert Bosch Gmbh Pump unit for supplying fuel, preferably diesel fuel, to an internal combustion engine
ITUA20162000A1 (en) * 2016-03-24 2017-09-24 Bosch Gmbh Robert PUMPING GROUP FOR FUEL SUPPLEMENTATION, PREFERABLY GASOIL, TO AN INTERNAL COMBUSTION ENGINE
IT201700042497A1 (en) * 2017-04-18 2018-10-18 Bosch Gmbh Robert HIGH PRESSURE PUMP FOR A FUEL SUPPLY SYSTEM TO AN INTERNAL COMBUSTION ENGINE; FUEL SUPPLY SYSTEM AND METHOD TO REALIZE THE HIGH PRESSURE PUMP
IT202000005620A1 (en) * 2020-03-17 2021-09-17 Vittorazi Motors S R L FUEL INJECTION CONTROL SYSTEM FOR AN INTERNAL COMBUSTION ENGINE FITTED WITH A FUEL RETURN LINE
IT202000005617A1 (en) * 2020-03-17 2021-09-17 Vittorazi Motors S R L FUEL SUPPLY CONTROL SYSTEM AND METHOD FOR AN INTERNAL COMBUSTION ENGINE

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Also Published As

Publication number Publication date
JP2014503737A (en) 2014-02-13
EP2652328A1 (en) 2013-10-23
RU2013132614A (en) 2015-01-27
CN103261683B (en) 2016-08-10
KR20130141594A (en) 2013-12-26
WO2012080334A1 (en) 2012-06-21
IT1403264B1 (en) 2013-10-17
CN103261683A (en) 2013-08-21
ITMI20102310A1 (en) 2012-06-17

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