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WO2019170369A1 - Pumping unit for feeding fuel, preferably diesel fuel, to an internal combustion engine - Google Patents

Pumping unit for feeding fuel, preferably diesel fuel, to an internal combustion engine Download PDF

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Publication number
WO2019170369A1
WO2019170369A1 PCT/EP2019/053267 EP2019053267W WO2019170369A1 WO 2019170369 A1 WO2019170369 A1 WO 2019170369A1 EP 2019053267 W EP2019053267 W EP 2019053267W WO 2019170369 A1 WO2019170369 A1 WO 2019170369A1
Authority
WO
WIPO (PCT)
Prior art keywords
fuel
feed
pumping unit
line
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.)
Ceased
Application number
PCT/EP2019/053267
Other languages
French (fr)
Inventor
Giuseppe MARZILIANO
Rocco Guarino
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
Original Assignee
Robert Bosch GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of WO2019170369A1 publication Critical patent/WO2019170369A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
    • F04B1/053—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement with actuating or actuated elements at the inner ends of the cylinders
    • F04B1/0536—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement with actuating or actuated elements at the inner ends of the cylinders with two or more serially arranged radial piston-cylinder units
    • F04B1/0538—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement with actuating or actuated elements at the inner ends of the cylinders with two or more serially arranged radial piston-cylinder units located side-by-side
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M63/00—Other 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
    • F02M63/02—Fuel-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
    • F02M63/0225—Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding common rails
    • F02M63/0265—Pumps feeding common rails
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
    • F04B1/0404—Details or component parts
    • F04B1/0452—Distribution members, e.g. valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
    • F04B1/047—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement with actuating or actuated elements at the outer ends of the cylinders
    • F04B1/0474—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement with actuating or actuated elements at the outer ends of the cylinders with two or more serially arranged radial piston-cylinder units
    • F04B1/0476—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement with actuating or actuated elements at the outer ends of the cylinders with two or more serially arranged radial piston-cylinder units located side-by-side
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B11/00—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation
    • F04B11/0091—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation using a special shape of fluid pass, e.g. throttles, ducts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B23/00—Pumping installations or systems
    • F04B23/04—Combinations of two or more pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/16—Casings; Cylinders; Cylinder liners or heads; Fluid connections

Definitions

  • the present invention relates to a pumping unit for feeding fuel, preferably diesel fuel, to an internal combustion engine.
  • the present invention relates to a pumping unit of the type comprising a high-pressure pump, for example a piston pump, designed to feed the fuel to an internal combustion engine; a pre-feed pump, for example a gear pump, designed to feed the fuel from a storage tank to the piston pump; and a hydraulic circuit for connecting together the storage tank and the internal combustion engine.
  • a high-pressure pump for example a piston pump
  • a pre-feed pump for example a gear pump
  • the piston pump comprises a pump body; at least two cylinders formed in the pump body and slidably engaged by respective pistons; and an actuating device for displacing the pistons along the associated cylinders with a reciprocating rectilinear movement comprising an intake stroke for drawing the fuel into the cylinders and a delivery stroke for supplying the fuel to the internal combustion engine.
  • the two cylinders have respective longitudinal axes which are parallel to each other and are each associated with a respective intake valve for drawing the fuel into the cylinder and with a respective delivery valve for supplying the fuel to the internal combustion engine.
  • the actuating device is configured so as to displace simultaneously a piston with its intake stroke and the other piston with its delivery stroke.
  • the hydraulic circuit comprises a first line for connecting together the storage tank and the gear pump; a second line for connecting together the gear pump and the piston pump; and a third line for connecting together the piston pump and the internal combustion engine.
  • the second line comprises a feed header and, for each cylinder, a respective intake duct for connecting the feed header to the said cylinder.
  • the hydraulic circuit further comprises a metering electrovalve arranged along the second line for selectively controlling the instantaneous flow of fuel fed to the piston pump depending on the values of a plurality of operating parameters of the internal combustion engine.
  • the known pumping units of the type described above have a number of drawbacks mainly resulting from the fact that the pressure waves generated in each intake duct by closing of the associated intake valve advance, via the feed header, along the other intake duct and may compromise the correct opening of the associated intake valve, and therefore the correct filling of the associated cylinder.
  • the object of the present invention is to provide a pumping unit for feeding fuel, preferably diesel fuel, to an internal combustion engine, which does not have the aforementioned drawbacks and which is simple and inexpensive to produce.
  • a pumping unit for feeding fuel, preferably diesel fuel, to an internal combustion engine is provided, as claimed in the accompanying claims.
  • Figure 1 is a hydraulic diagram of a preferred embodiment of the pumping unit according to the present invention
  • Figure 2 is a schematic perspective view, with parts cross-sectioned, of a detail of the pumping unit of Figure 1;
  • Figure 3 is a perspective view of a detail of Figure 2.
  • 1 denotes in its entirety a pumping unit for feeding a fuel, preferably diesel fuel, from a storage tank 2 to an internal combustion engine 3, in the case in question a diesel combustion engine.
  • a fuel preferably diesel fuel
  • the engine 3 comprises a header 4 for distribution of the fuel, commonly known by the term “common rail”, and a plurality of injectors 5 connected to the header 4 and designed to atomize the fuel inside associated combustion chambers (not shown) of the said engine 3.
  • the pumping unit 1 comprises a high-pressure pump 6, namely a piston pump, for feeding the fuel to the engine 3; and a low-pressure or pre-feed pump 7, namely a gear pump, which is for example electrically operated, for feeding the fuel from the tank 2 to the pump 6.
  • the pump 6 comprises a pump body 8 and, in this case, two cylinders 9, which are formed in the pump body 8 and have respective longitudinal axes 10 substantially parallel to each other.
  • the cylinders 9 are slidably engaged by respective pistons 11 movable, under the thrust of an actuating device 12, with an alternating rectilinear movement comprising an intake stroke for drawing the fuel inside the associated cylinders 9 and a delivery stroke for supplying the fuel to the engine 3.
  • the device 12 comprises a cam transmission shaft 13 which is housed inside a first containing chamber 14 formed in the pump body 8 and is designed to displace the pistons 11 with their delivery stroke.
  • the device 12 also comprises, for each piston 11, a respective spring (not shown) which is housed inside a second containing chamber (not shown) formed in the pump body 8 and is designed to displace said piston 11 with its intake stroke.
  • the shaft 13 is configured so as to allow the pistons 11 to be displaced simultaneously, one with its intake stroke and the other with its delivery stroke.
  • the pumping unit 1 also comprises a hydraulic circuit 15 comprising, in turn, a first line 16 for connecting together the tank 2 and the pump 7; a second line 17 for connecting together the pump 7 and the pump 6; and a third line 18 for connecting together the pump 6 and the header 4.
  • the line 17 is provided with a filtering device 19 for filtering the fuel fed to the cylinders 9 and also has a metering electrovalve 20, mounted downstream of the device 19 in a direction 21 of flow of the fuel along the line 17, for selectively controlling 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 line 17 and the line 18 are connected to each cylinder 9 by means of an intake valve 22 and a delivery valve 23, respectively.
  • the circuit 15 also comprises a fourth line 24, which extends between the header 4 and the line 16 and allows the fuel flow which exceeds that needed for the injectors 5 to be discharged into the line 16; and a fifth line 25 which extends between the line 17 and the line 16 and is connected to the line 17 downstream of the electrovalve 20 in the direction 21 for feeding to the inlet of the pump 7 the fuel seeping through the electrovalve 20 when the said electrovalve 20 is closed.
  • the circuit 15 also has a sixth line 26 which extends between the line 17 and the line 24, is connected to the line 17 upstream of the electrovalve 20 in the direction 21 and is provided with a valve device 27.
  • the device 27 is configured to control the supply into the pump body 8 and into the containing chamber 14 of the fuel flow used to lubricate the cam transmission shaft 13 and the fuel flow in excess of that fed through the electrovalve 20.
  • the circuit 15 comprises, finally, a seventh line 28 for feeding into the line 26 and therefore into the tank 2 the fuel seeping through the pump body 8.
  • the line 17 comprises a feed header 29 and, for each cylinder 9, a respective intake duct 30 for connecting the header 29 to said cylinder 9.
  • the header 29 houses a flow separator 31 designed to divide the fuel supplied by the pump 7 into two fuel flows, each of which is advanced along an associated duct 30 to the associated intake valve 22.
  • the separator 31 is mounted downstream of the electrovalve 20 in the direction 21, and comprises a separator element 32, which has the form of a flat plate and is designed to divide the header 29 into two separate feed channels 33 each connected to an associated duct 30.
  • the separator 31 also comprises a coupling element 34, which has the form of a cylindrical hub, is integral with the element 32, and is slidably engaged in the header 29.
  • the element 34 is mounted between the two ducts 30, is configured in such a way as to axially close one of the channels 33 and divert the fuel into the associated duct 30, and also has an opening 35 designed to allow the fuel fed along the other channel 33 to advance through the separator 31 and into the associated duct 30.
  • the pumping unit 1 Since the pressure waves generated by the closing of each intake valve 22 advance along the associated intake duct 30 and the associated feed channel 33 without reaching the intake duct 30 of the other intake valve 22, the pumping unit 1 has a number of advantages mainly resulting from the fact that the flow separator 31 allows each intake valve 22 to operate independently of the other intake valve 22, and therefore ensures correct filling of the cylinders 9.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

A pumping unit for feeding fuel, preferably diesel fuel, to an internal combustion engine (3) is provided with a high-pressure pump (6) having at least two cylinders (9), with a feed header (29) for feeding the fuel to the high-pressure pump (6), with an intake duct (30) for connecting the feed header (29) to each cylinder (9), and with a flow separator (31) inserted into the feed header (29) for dividing the fuel supplied by a pre-feed pump (7) into two fuel flows each advanced along an associated intake duct (30).

Description

Description
Title
PUMPING UNIT FOR FEEDING FUEL, PREFERABLY DIESEL FUEL, TO AN INTERNAL COMBUSTION ENGINE
The present invention relates to a pumping unit for feeding fuel, preferably diesel fuel, to an internal combustion engine.
In particular the present invention relates to a pumping unit of the type comprising a high-pressure pump, for example a piston pump, designed to feed the fuel to an internal combustion engine; a pre-feed pump, for example a gear pump, designed to feed the fuel from a storage tank to the piston pump; and a hydraulic circuit for connecting together the storage tank and the internal combustion engine.
The piston pump comprises a pump body; at least two cylinders formed in the pump body and slidably engaged by respective pistons; and an actuating device for displacing the pistons along the associated cylinders with a reciprocating rectilinear movement comprising an intake stroke for drawing the fuel into the cylinders and a delivery stroke for supplying the fuel to the internal combustion engine.
The two cylinders have respective longitudinal axes which are parallel to each other and are each associated with a respective intake valve for drawing the fuel into the cylinder and with a respective delivery valve for supplying the fuel to the internal combustion engine.
The actuating device is configured so as to displace simultaneously a piston with its intake stroke and the other piston with its delivery stroke. The hydraulic circuit comprises a first line for connecting together the storage tank and the gear pump; a second line for connecting together the gear pump and the piston pump; and a third line for connecting together the piston pump and the internal combustion engine.
The second line comprises a feed header and, for each cylinder, a respective intake duct for connecting the feed header to the said cylinder.
Generally, the hydraulic circuit further comprises a metering electrovalve arranged along the second line for selectively controlling the instantaneous flow of fuel fed to the piston pump depending on the values of a plurality of operating parameters of the internal combustion engine.
The known pumping units of the type described above have a number of drawbacks mainly resulting from the fact that the pressure waves generated in each intake duct by closing of the associated intake valve advance, via the feed header, along the other intake duct and may compromise the correct opening of the associated intake valve, and therefore the correct filling of the associated cylinder.
The object of the present invention is to provide a pumping unit for feeding fuel, preferably diesel fuel, to an internal combustion engine, which does not have the aforementioned drawbacks and which is simple and inexpensive to produce.
According to the present invention a pumping unit for feeding fuel, preferably diesel fuel, to an internal combustion engine is provided, as claimed in the accompanying claims.
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 pumping unit according to the present invention; Figure 2 is a schematic perspective view, with parts cross-sectioned, of a detail of the pumping unit of Figure 1; and
Figure 3 is a perspective view of a detail of Figure 2.
With reference to Figure 1, 1 denotes in its entirety a pumping unit for feeding a fuel, preferably diesel fuel, from a storage tank 2 to an internal combustion engine 3, in the case in question a diesel combustion engine.
The engine 3 comprises a header 4 for distribution of the fuel, commonly known by the term "common rail", and a plurality of injectors 5 connected to the header 4 and designed to atomize the fuel inside associated combustion chambers (not shown) of the said engine 3.
The pumping unit 1 comprises a high-pressure pump 6, namely a piston pump, for feeding the fuel to the engine 3; and a low-pressure or pre-feed pump 7, namely a gear pump, which is for example electrically operated, for feeding the fuel from the tank 2 to the pump 6.
The pump 6 comprises a pump body 8 and, in this case, two cylinders 9, which are formed in the pump body 8 and have respective longitudinal axes 10 substantially parallel to each other.
The cylinders 9 are slidably engaged by respective pistons 11 movable, under the thrust of an actuating device 12, with an alternating rectilinear movement comprising an intake stroke for drawing the fuel inside the associated cylinders 9 and a delivery stroke for supplying the fuel to the engine 3.
The device 12 comprises a cam transmission shaft 13 which is housed inside a first containing chamber 14 formed in the pump body 8 and is designed to displace the pistons 11 with their delivery stroke. The device 12 also comprises, for each piston 11, a respective spring (not shown) which is housed inside a second containing chamber (not shown) formed in the pump body 8 and is designed to displace said piston 11 with its intake stroke.
In connection with the above description it should be pointed out that the shaft 13 is configured so as to allow the pistons 11 to be displaced simultaneously, one with its intake stroke and the other with its delivery stroke.
The pumping unit 1 also comprises a hydraulic circuit 15 comprising, in turn, a first line 16 for connecting together the tank 2 and the pump 7; a second line 17 for connecting together the pump 7 and the pump 6; and a third line 18 for connecting together the pump 6 and the header 4.
The line 17 is provided with a filtering device 19 for filtering the fuel fed to the cylinders 9 and also has a metering electrovalve 20, mounted downstream of the device 19 in a direction 21 of flow of the fuel along the line 17, for selectively controlling 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 line 17 and the line 18 are connected to each cylinder 9 by means of an intake valve 22 and a delivery valve 23, respectively.
The circuit 15 also comprises a fourth line 24, which extends between the header 4 and the line 16 and allows the fuel flow which exceeds that needed for the injectors 5 to be discharged into the line 16; and a fifth line 25 which extends between the line 17 and the line 16 and is connected to the line 17 downstream of the electrovalve 20 in the direction 21 for feeding to the inlet of the pump 7 the fuel seeping through the electrovalve 20 when the said electrovalve 20 is closed.
The circuit 15 also has a sixth line 26 which extends between the line 17 and the line 24, is connected to the line 17 upstream of the electrovalve 20 in the direction 21 and is provided with a valve device 27. The device 27 is configured to control the supply into the pump body 8 and into the containing chamber 14 of the fuel flow used to lubricate the cam transmission shaft 13 and the fuel flow in excess of that fed through the electrovalve 20.
The circuit 15 comprises, finally, a seventh line 28 for feeding into the line 26 and therefore into the tank 2 the fuel seeping through the pump body 8.
In accordance with that shown in Figures 2 and 3, the line 17 comprises a feed header 29 and, for each cylinder 9, a respective intake duct 30 for connecting the header 29 to said cylinder 9.
Internally, the header 29 houses a flow separator 31 designed to divide the fuel supplied by the pump 7 into two fuel flows, each of which is advanced along an associated duct 30 to the associated intake valve 22.
The separator 31 is mounted downstream of the electrovalve 20 in the direction 21, and comprises a separator element 32, which has the form of a flat plate and is designed to divide the header 29 into two separate feed channels 33 each connected to an associated duct 30.
The separator 31 also comprises a coupling element 34, which has the form of a cylindrical hub, is integral with the element 32, and is slidably engaged in the header 29.
Since the ducts 30 are arranged in succession along the header 29, the element 34 is mounted between the two ducts 30, is configured in such a way as to axially close one of the channels 33 and divert the fuel into the associated duct 30, and also has an opening 35 designed to allow the fuel fed along the other channel 33 to advance through the separator 31 and into the associated duct 30.
Since the pressure waves generated by the closing of each intake valve 22 advance along the associated intake duct 30 and the associated feed channel 33 without reaching the intake duct 30 of the other intake valve 22, the pumping unit 1 has a number of advantages mainly resulting from the fact that the flow separator 31 allows each intake valve 22 to operate independently of the other intake valve 22, and therefore ensures correct filling of the cylinders 9.

Claims

Claims
1. Pumping unit for feeding fuel, preferably diesel fuel, to the internal
combustion engine (3), the pumping unit comprising a high-pressure pump (6) for feeding the fuel to an internal combustion engine (3); a pre feed pump (7) for feeding the fuel from a storage tank (2) to the high- pressure pump (6); and a hydraulic circuit (15) comprising a first line (16) for connecting together the storage tank (2) and the pre-feed pump (7), a second line (17) for connecting together the pre-feed pump (7) and the high-pressure pump (6), and a third line (18) for connecting together the high-pressure pump (6) and the internal combustion engine (3); the high- pressure pump (6) comprising at least two cylinders (9) slidably engaged by respective pistons (11), and an actuating device (12) for displacing the pistons (11) along the said cylinders (9) with a reciprocating rectilinear movement; the second line (17) comprising a feed header (29) and, for each cylinder (9), a respective intake duct (30) for connecting together the feed header (29) and the said cylinder (9); and being characterized in that the hydraulic circuit (15) further comprises a flow separator (31) inserted into the feed header (29) for dividing the fuel supplied by the pre-feed pump (7) into two fuel flows each advanced along an associated intake duct (30).
2. Pumping unit according to Claim 1, wherein the flow separator (31)
comprises a separator element (32) inserted into the feed header (29) for dividing the feed header (29) into two separate feed channels (33), and a coupling element (34) integral with the separator element (32) and slidably engaged in said feed header (29).
3. Pumping unit according to Claim 2, wherein the intake ducts (30) are arranged in succession along the feed header (29); the coupling element (34) being mounted between the two intake ducts (30).
4. Pumping unit according to Claim 2 or 3, wherein the coupling element (34) is configured in such a way as to axially close one of the feed channels (33), and has an opening (35) for the other feed channel (33).
5. Pumping unit according to any one of Claims 2 to 4, wherein the
separator element (32) has the form of a flat plate and the coupling element (34) has the form of a cylindrical hub.
6. Pumping unit according to any one of the preceding claims, wherein the second line (17) is also provided with a metering electrovalve (20) displaceable between an open position and a closed position of the second line (17); the flow separator (31) being mounted downstream of the metering electrovalve (20) in an advancing direction (21) of the fuel along said second line (17).
7. Pumping unit according to any one of the preceding claims, wherein the cylinders (9) have respective longitudinal axes (10) parallel to each other.
PCT/EP2019/053267 2018-03-07 2019-02-11 Pumping unit for feeding fuel, preferably diesel fuel, to an internal combustion engine Ceased WO2019170369A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT102018000003340 2018-03-07
IT102018000003340A IT201800003340A1 (en) 2018-03-07 2018-03-07 PUMPING GROUP TO FEED FUEL, PREFERABLY DIESEL, TO AN INTERNAL COMBUSTION ENGINE

Publications (1)

Publication Number Publication Date
WO2019170369A1 true WO2019170369A1 (en) 2019-09-12

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PCT/EP2019/053267 Ceased WO2019170369A1 (en) 2018-03-07 2019-02-11 Pumping unit for feeding fuel, preferably diesel fuel, to an internal combustion engine

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IT (1) IT201800003340A1 (en)
WO (1) WO2019170369A1 (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5701873A (en) * 1993-11-08 1997-12-30 Eidgenoessische Technische Hochschule Laboratorium Fuer Verbrennungsmotoren Und Verbrennungstechnik Control device for a filling-ratio adjusting pump
US5769611A (en) * 1996-09-06 1998-06-23 Stanadyne Automotive Corp. Hydraulic pressure supply pump with multiple sequential plungers
EP1522726A2 (en) * 2003-10-08 2005-04-13 Denso Corporation Safety fuel injection pump

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5701873A (en) * 1993-11-08 1997-12-30 Eidgenoessische Technische Hochschule Laboratorium Fuer Verbrennungsmotoren Und Verbrennungstechnik Control device for a filling-ratio adjusting pump
US5769611A (en) * 1996-09-06 1998-06-23 Stanadyne Automotive Corp. Hydraulic pressure supply pump with multiple sequential plungers
EP1522726A2 (en) * 2003-10-08 2005-04-13 Denso Corporation Safety fuel injection pump

Also Published As

Publication number Publication date
IT201800003340A1 (en) 2019-09-07

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