WO2009053364A1 - Système d'injection de carburant avec pompe à haute pression lubrifiée par le carburant, et unité de pompe associée - Google Patents

Système d'injection de carburant avec pompe à haute pression lubrifiée par le carburant, et unité de pompe associée Download PDF

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Publication number
WO2009053364A1
WO2009053364A1 PCT/EP2008/064220 EP2008064220W WO2009053364A1 WO 2009053364 A1 WO2009053364 A1 WO 2009053364A1 EP 2008064220 W EP2008064220 W EP 2008064220W WO 2009053364 A1 WO2009053364 A1 WO 2009053364A1
Authority
WO
WIPO (PCT)
Prior art keywords
pressure pump
pump
fuel
chamber
low
Prior art date
Application number
PCT/EP2008/064220
Other languages
English (en)
Inventor
Sascha Ambrock
Angelo Forte
Vito Calabrese
Giuseppe Ficarella
Vittorio Caroli
Marco Lamm
Nello Medoro
Antonio Mercurio
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 WO2009053364A1 publication Critical patent/WO2009053364A1/fr

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Classifications

    • 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
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/44—Details, 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
    • 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
    • F02M63/0001—Fuel-injection apparatus with specially arranged lubricating system, e.g. by fuel oil
    • 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
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/02—Pumps 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
    • F02M59/04—Pumps 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
    • F02M59/06—Pumps 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
    • 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

Definitions

  • the present invention relates to a fuel injection system for an internal combustion engine with a high-pressure pump lubricated with the fuel and to the associated pump unit.
  • the high-pressure pump comprises a pump body inside which the pumping members which are actuated by a mechanism enclosed inside a chamber of the pump body are arranged.
  • This mechanism comprises a camshaft which has support bearings and end seals as well as surfaces for frictional contact between the pumping members and the cams, which surfaces are generally lubricated with part of the fuel supplied to the high-pressure pump.
  • these systems also comprise a low-pressure pump which is designed to supply the fuel to the high-pressure pump via a feed line, and the usual common rail connected to the delivery side of the high-pressure pump in order to receive the pressurized fuel.
  • a fuel discharge line receives the excess fuel discharged from the common rail together with the lubrication fuel discharged from the pump body chamber and the fuel arising from the injectors or from leakages of the pumping members, in particular between the cylinder and piston.
  • the low-pressure pump which is generally a gear pump, may be operated independently of the high-pressure pump, for example by an electric motor.
  • the low-pressure pump may be operated mechanically in synchronism with the high-pressure pump.
  • the delivery of the low-pressure pump depends on the number of revolutions of the engine, so that the quantity of lubricating fuel varies considerably.
  • the lubricating fuel may flow out too rapidly from the pump body chamber into the discharge line.
  • the pump body chamber and the ducts connected thereto could be devoid of lubricant and subject to cavitation effects, while the actuating mechanism could be damaged owing to the high degree of friction.
  • the object of the present invention is to provide a fuel injection system with a high-pressure pump lubricated by the fuel, which is able to ensure adequate lubrication in any operating conditions of the engine and is devoid of the drawbacks of the known systems and can be manufactured in a simple and low- cost manner.
  • this object is achieved by a fuel-injection system for an internal combustion engine with a high-pressure pump lubricated by the fuel, as defined in Claim 1.
  • the object of the invention is also achieved by a pump unit comprising a high- pressure pump lubricated with the fuel and a low-pressure pump, as defined by Claim 24.
  • FIG. 1 is a diagram of a fuel injection system with a high-pressure pump lubricated with the fuel, according to the invention
  • FIG. 2 is a cross-sectional view of a detail of the system shown in Figure 1;
  • FIG. 3 is a detail of the system shown in Figure 1, according to a variant of the invention.
  • FIG. 4 is a cross-sectional view of the detail shown in Figure 2, according to the variant of Figure 3.
  • 1 denotes in its entirety a fuel injection system for an internal combustion engine, which comprises essentially a tank 2 containing fuel to be pumped, a pump unit 3 indicated schematically by means of a polygon shown in dot-dash lines, and a manifold or common rail 4 designed to receive from the pump unit 3 the pressurized fuel for feeding a series of injectors 5 for the cylinders of an internal combustion engine (not shown in the figure).
  • the pump unit 3 communicates with the tank 2 via a low-pressure intake line 6 along which a filter 7 for separating the water from the intake fuel is arranged.
  • the pump unit 3 also communicates with the common rail 4 via a delivery line 8.
  • the pump unit 3 comprises a low-pressure pump 9, for example a gear pump, which is able to compress the intake fuel, so as to impart to it a predetermined pressure, for example in the region of 5 bar.
  • the low-pressure pump 9 is designed to supply the fuel thus compressed to a high-pressure pump 10 via a feed line 11 along which another filter 12 is preferably arranged.
  • the high- pressure pump 10 is designed to compress the fuel received to a very high pressure, for example in the region of 1800 bar, so as to supply it via the delivery line 8 to the common rail 4.
  • the low-pressure pump 9 draws the fuel from the intake line 6 which is provided with a choke 13 calibrated so as to ensure a predetermined throughput of intake fuel. Moreover, the low-pressure pump 9 may be provided with a bypass valve 14 which is designed to allow the fuel to bypass the pump 9 until its pressure upstream of the choke 13 reaches a minimum value, for example in the region of 0.1 bar above atmospheric pressure. Finally, the low- pressure pump 9 is provided with an overpressure valve 16 designed to discharge the excess fuel pumped by it into the intake line 6.
  • the high-pressure pump 10 comprises at least one pumping member 17 formed by a cylinder 18 inside which a piston 19 slides with a reciprocating movement.
  • the cylinder 18 communicates with the feed line 11 via an intake valve 21 and communicates with the delivery line 8 via a delivery valve 22.
  • the high-pressure pump 10 comprises three pumping members 17 arranged radially at 120° with respect to a shaft 23 which forms part of a mechanism for actuating the three pistons 19, denoted generically by 24.
  • the high-pressure pump 10 also comprises a pump body 26 which is indicated in the diagram of Figure 1 by means of a quadrilateral shown in broken lines.
  • the pump body 26 comprises an internal chamber 27 which houses the actuating mechanism 24 inside it.
  • the pump body 26 is provided with internal ducts 28, which connect the feed line 11 to the three intake valves 21, and other internal ducts 29 which connect the three delivery valves 22 to the delivery line 8.
  • the actuating mechanism 24 essentially comprises a cam 31 for actuating the three pistons 19, which is fixed onto the shaft 23.
  • the latter is rotatable in a known manner on supports mounted on the pump body 26 and is provided with a seal for closing the chamber 27.
  • the cam 31 is designed to actuate a prismatic ring 32 which has three flat faces 33.
  • Each of the three pistons 19 rests on a corresponding face 33 owing to the action of a compression spring (not shown in the diagram) which is arranged between a seat of the pump body 26 and a so- called cup (also not shown in the diagram).
  • the bottom of the cup makes contact on one side with the corresponding piston 19 and on the other side with the corresponding flat face 33 of the prismatic ring 32 along which it is able to slide transversely during rotation of the cam 31.
  • the feed line 11 is provided, between the filter 12 and the internal ducts 28 for feeding the cylinders 18, with a metering solenoid valve 34 which is designed to control the quantity of fuel which must feed the pump 10.
  • the solenoid valve 34 is opened and closed under the control of an electronic unit 36 depending on the operating conditions of the engine, namely depending on the fuel which the injectors 5 must inject in each case, in order to reduce as far as possible the variations in pressure in the common rail 4.
  • the solenoid valve 34 is controlled by the electronic unit 36 via the PWM (pulse width modulation) system.
  • Control may be performed in synchronism with the intake stroke of each piston 19 of the high-pressure pump 10, varying the stroke part during which the fuel may be drawn in.
  • the common rail 4 is provided with a discharge solenoid valve 37 which, when opened, discharges the excess fuel via a discharge line 38 communicating with the tank 2.
  • Each injector 5 comprises a corresponding metering valve 39 (in the diagram only one of them has been shown).
  • Each metering valve 39 is provided with a chamber for hydraulically controlling the injector 5 by means of the same pressurized fuel.
  • the various metering valves 39 of the injectors 5 discharge the fuel along the discharge line 38.
  • the electronic unit 36 controls, depending on the operating conditions of the engine, not only the metering solenoid valve 34, but also the solenoid valve 37 for controlling the pressure of the fuel in the common rail 4. Finally, the electronic unit 36 also controls the metering valves 39 of the injectors 5 (only one of which is shown in the Figure 1) in order to determine the instant and the duration of each injection operation.
  • the shaft 23 is rotated by the engine shaft via mechanical means for transmission of the driving power.
  • the low-pressure pump 9 is mechanically operated in synchronism with the high- pressure pump 10, for example by means of a section of the shaft 23 extending outside the chamber 27.
  • the pump body 26 of the high-pressure pump 10 also defines partly the pump body of the low-pressure pump 9.
  • the low-pressure pump 9 is assembled on the pump body 26 of the high-pressure pump 10.
  • Both variants are particularly compact, but ensure that the delivery of the low- pressure pump 9 depends solely on the running speed of the engine and not on the load conditions of the engine itself.
  • the chamber 27 is provided with an inlet opening 41 which communicates with the feed line 11 via a lubricating line 42.
  • the two lines 11 and 42 are connected by means of a connection 43 arranged between the fuel filter 12 and the metering solenoid valve 34, or between the low-pressure pump 9 and the metering solenoid valve 34 in the case where the fuel filter 12 is not present.
  • a hydraulic circuit is arranged along the lubricating line 42.
  • the solenoid valve 34 and the hydraulic circuit 44 are contained in the pump body 26.
  • the hydraulic circuit 44 comprises a first choke 45 for metering the quantity of fuel to be supplied directly to the chamber 27, and a variable-flow valve 46.
  • the valve 46 is arranged in parallel with the choke 45 and has an inlet 47 connected to the lubricating line 42 via a second choke 48 for modulating the fuel to be supplied to the chamber 27.
  • the valve 46 is provided with an outlet 49 communicating with the intake line 6 of the low-pressure pump 9.
  • the chamber 27 of the pump body 26 also has an outlet opening 55 for the fuel from the chamber 27, which communicates with a discharge line 50 and terminates in an outlet 51 of the pump body 26.
  • the outlet 51 communicates with the discharge line 38 via an outlet union 52.
  • the internal ducts 28 communicate with another internal duct 53 which is provided with a choke 54 and leads into the discharge line 50.
  • the choke 54 has the function of ensuring a metered fuel flow within the hydraulic circuit 28 and in the absence of delivery from the high-pressure pump 10.
  • these means consist of a choke 56 with a calibrated diameter.
  • this choke 56 may be provided inside a bush 57 inserted in any known manner within the discharge line 50 in the region of the outlet opening 55 of the chamber 27.
  • the diameter of the choke 56 may range between 0.5 and 2 mm. Preferably this diameter may be chosen between 1.10 and 1.60 mm.
  • the means designed to limit the quantity of discharged fuel consist of a non-return valve 58 with a maximum throughput of 50 litres per hour.
  • valve 58 is kept closed by a compression spring 59 and is inserted along the discharge line 50, in any known manner, at the outlet opening 55 of the chamber 27.
  • the valve 58 is designed to open when the pressure of the fuel inside the chamber 27 is at least 0.4 bar higher than the pressure of the discharge line 50 and therefore the discharge duct 38. This variant is used for those applications with the pressure inside the duct 38 does not exceed about 1.4 bar so as to prevent overpressures inside the chamber 27.
  • the fuel is supplied to the feed line 11 by the low-pressure pump 9 ( Figure 1). From the feed line 11 the fuel passes through the metering solenoid valve 34, flows along the internal ducts 28 of the pump body 26 and the intake valves 21 until it reaches the cylinders 18 of the high-pressure pump 10. A part of the fuel inside the line 11, via the line 42, the hydraulic circuit 44 and the inlet opening 41, enters into the chamber 27 so as to lubricate and cool the actuating mechanism 24, including the rotary couplings of the shaft 23 and the friction couplings of the cups of the pistons 19 making contact with the faces 33 of the prismatic ring 31, and the seals between the shaft
  • the low-pressure pump 9 may be separate from the high-pressure pump 10.
  • the metering solenoid valve 34 and/or the hydraulic circuit 44 may be outside the pump body 26, while the filter 12 along the feed line 11 may be eliminated.
  • the choke 56, or the non-return valve 58, ( Figures 2 and 4) may also be arranged in any position along the discharge line 50 of the chamber 27.
  • the high-pressure pump 10 may have a number of pumping members 17 other than three, for example two pumping members arranged opposite each other.

Landscapes

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

Abstract

L'invention concerne un système d'injection qui comprend une pompe à haute pression (10) qui est lubrifiée par le carburant et alimentée par une pompe à basse pression (9) par l'intermédiaire d'une conduite d'alimentation (11). La pompe à haute pression (10) comprend un corps de pompe (26) à l'intérieur duquel un élément de pompage (17) est agencé et comporte une chambre (27) à l'intérieur de laquelle un mécanisme (24) pour actionner l'élément de pompage (17), comportant un arbre (23), est agencé. La chambre (27) comporte une ouverture d'entrée (41) communiquant avec la conduite d'alimentation (11) de façon à distribuer dans la chambre (27) elle-même une partie du carburant distribué par la pompe à basse pression (9) afin de lubrifier et refroidir le mécanisme d'actionnement (24). La chambre (27) comporte également une ouverture de sortie (55) communiquant avec une conduite (38) pour décharger le carburant pompé en excès. Un volet (56) est agencé, par exemple, dans l'ouverture de sortie (55), ledit volet étant agencé pour limiter la quantité de carburant déchargé à partir de la chambre (27) dans la conduite de décharge (38). En particulier, la pompe basse pression (9) est une pompe à actionnement mécanique synchronisée avec l'arbre (23) du mécanisme d'actionnement (24) de la pompe haute pression (10) et est combinée avec cette pompe (10) de façon à former une seule unité de pompe (3).
PCT/EP2008/064220 2007-10-26 2008-10-21 Système d'injection de carburant avec pompe à haute pression lubrifiée par le carburant, et unité de pompe associée WO2009053364A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI20072066 ITMI20072066A1 (it) 2007-10-26 2007-10-26 Impianto di iniezione di combustibile con una pompa ad alta pressione lubrificata con il combustibile, e relativo gruppo pompe
ITMI2007A002066 2007-10-26

Publications (1)

Publication Number Publication Date
WO2009053364A1 true WO2009053364A1 (fr) 2009-04-30

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PCT/EP2008/064220 WO2009053364A1 (fr) 2007-10-26 2008-10-21 Système d'injection de carburant avec pompe à haute pression lubrifiée par le carburant, et unité de pompe associée

Country Status (2)

Country Link
IT (1) ITMI20072066A1 (fr)
WO (1) WO2009053364A1 (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITMI20091139A1 (it) * 2009-06-29 2010-12-30 Bosch Gmbh Robert Impianto per alimentare combustibile, preferibilmente gasolio, a un motore a combustione interna, pompa a pistoni e metodo ad esso associati
ITMI20091569A1 (it) * 2009-09-14 2011-03-15 Bosch Gmbh Robert Pompa ad alta pressione migliorata per alimentare combustibile a un motore a combustione interna e anello di tenuta albero migliorato per la stessa
WO2011131448A1 (fr) * 2010-04-20 2011-10-27 Robert Bosch Gmbh Agencement de pompe
FR2964418A3 (fr) * 2010-09-03 2012-03-09 Renault Sas Circuit a carburant d'un moteur a injection directe a haute pression
WO2013037538A1 (fr) * 2011-09-14 2013-03-21 Robert Bosch Gmbh Circuit basse pression pour système d'injection de carburant et système d'injection de carburant
WO2013164117A1 (fr) * 2012-05-04 2013-11-07 Robert Bosch Gmbh Pompe à carburant haute pression
ITMI20131923A1 (it) * 2013-11-20 2015-05-21 Bosch Gmbh Robert Gruppo di pompaggio per alimentare combustibile, preferibilmente gasolio, da un serbatoio di contenimento ad un motore a combustione interna
IT202100010568A1 (it) * 2021-04-27 2022-10-27 Bosch Gmbh Robert Gruppo pompa per alimentare carburante ad un motore a combustione interna

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1298307A2 (fr) * 2001-09-28 2003-04-02 Isuzu Motors Limited Dispositif de commande de système d'injection à rampe commune pour un moteur
EP1469190A1 (fr) * 2003-04-15 2004-10-20 Denso Corporation Système d'alimentation en carburant sous haute pression
EP1712775A1 (fr) * 2004-02-06 2006-10-18 Bosch Corporation Dispositif d'alimentation en carburant
DE102005027851A1 (de) * 2005-06-16 2006-12-21 Robert Bosch Gmbh Kraftstoffeinspritzsystem für eine Brennkraftmaschine
DE102006013165A1 (de) * 2006-03-22 2007-09-27 Robert Bosch Gmbh Kraftstoffhochdruckpumpe und Kraftstoffeinspritzsystem für eine Brennkraftmaschine

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1298307A2 (fr) * 2001-09-28 2003-04-02 Isuzu Motors Limited Dispositif de commande de système d'injection à rampe commune pour un moteur
EP1469190A1 (fr) * 2003-04-15 2004-10-20 Denso Corporation Système d'alimentation en carburant sous haute pression
EP1712775A1 (fr) * 2004-02-06 2006-10-18 Bosch Corporation Dispositif d'alimentation en carburant
DE102005027851A1 (de) * 2005-06-16 2006-12-21 Robert Bosch Gmbh Kraftstoffeinspritzsystem für eine Brennkraftmaschine
DE102006013165A1 (de) * 2006-03-22 2007-09-27 Robert Bosch Gmbh Kraftstoffhochdruckpumpe und Kraftstoffeinspritzsystem für eine Brennkraftmaschine

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITMI20091139A1 (it) * 2009-06-29 2010-12-30 Bosch Gmbh Robert Impianto per alimentare combustibile, preferibilmente gasolio, a un motore a combustione interna, pompa a pistoni e metodo ad esso associati
ITMI20091569A1 (it) * 2009-09-14 2011-03-15 Bosch Gmbh Robert Pompa ad alta pressione migliorata per alimentare combustibile a un motore a combustione interna e anello di tenuta albero migliorato per la stessa
WO2011131448A1 (fr) * 2010-04-20 2011-10-27 Robert Bosch Gmbh Agencement de pompe
FR2964418A3 (fr) * 2010-09-03 2012-03-09 Renault Sas Circuit a carburant d'un moteur a injection directe a haute pression
WO2013037538A1 (fr) * 2011-09-14 2013-03-21 Robert Bosch Gmbh Circuit basse pression pour système d'injection de carburant et système d'injection de carburant
WO2013164117A1 (fr) * 2012-05-04 2013-11-07 Robert Bosch Gmbh Pompe à carburant haute pression
ITMI20131923A1 (it) * 2013-11-20 2015-05-21 Bosch Gmbh Robert Gruppo di pompaggio per alimentare combustibile, preferibilmente gasolio, da un serbatoio di contenimento ad un motore a combustione interna
WO2015074878A1 (fr) * 2013-11-20 2015-05-28 Robert Bosch Gmbh Unité de pompage pour alimentation en carburant, de préférence en carburant diesel, depuis un réservoir de stockage vers un moteur à combustion interne
US10190553B2 (en) 2013-11-20 2019-01-29 Robert Bosch Gmbh Pumping unit for feeding fuel, preferably diesel fuel, from a storage tank to an internal combustion engine
IT202100010568A1 (it) * 2021-04-27 2022-10-27 Bosch Gmbh Robert Gruppo pompa per alimentare carburante ad un motore a combustione interna
WO2022228818A1 (fr) * 2021-04-27 2022-11-03 Robert Bosch Gmbh Unité de pompe pour la fourniture de carburant à un moteur à combustion interne

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