EP4217601B1 - Pompe à carburant haute pression pour système d'injection de carburant d'un moteur à combustion interne - Google Patents

Pompe à carburant haute pression pour système d'injection de carburant d'un moteur à combustion interne Download PDF

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Publication number
EP4217601B1
EP4217601B1 EP21772708.0A EP21772708A EP4217601B1 EP 4217601 B1 EP4217601 B1 EP 4217601B1 EP 21772708 A EP21772708 A EP 21772708A EP 4217601 B1 EP4217601 B1 EP 4217601B1
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EP
European Patent Office
Prior art keywords
pressure
channel
low
pump
longitudinal axis
Prior art date
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Active
Application number
EP21772708.0A
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German (de)
English (en)
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EP4217601A1 (fr
Inventor
Rainer Kornhaas
Stephan Wehr
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Robert Bosch GmbH
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Robert Bosch GmbH
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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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/04—Means for damping vibrations or pressure fluctuations in injection pump inlets or outlets
    • 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
    • F02M59/025—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 a single 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
    • 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
    • F02M59/46—Valves
    • F02M59/462—Delivery valves

Definitions

  • the invention relates to a high-pressure fuel pump for a fuel injection system of an internal combustion engine according to the preamble of claim 1.
  • Such a high-pressure fuel pump is made, for example, from DE 10 2018 211 237 A1
  • This high-pressure fuel pump has a pump housing and a pump cover mounted thereon with a low-pressure chamber.
  • a pressure relief valve is arranged in a recess formed in the pump housing, the recess being fluidly connected to a delivery chamber in which a piston runs.
  • Another fuel pump is also made of DE 103 27 411 A1 In such high-pressure fuel pumps, excessive wear and cavitation erosion can occur on the pressure relief valve.
  • a high-pressure fuel pump for a fuel injection system of an internal combustion engine wherein the high-pressure fuel pump has a pump housing and a pump cover mounted on the pump housing (which may not be detachable from the pump housing without causing damage), which together with the pump housing delimits a low-pressure chamber.
  • a recess is formed in the pump housing, in which a pressure relief valve is arranged.
  • the recess is fluidly connected to the low-pressure chamber via a channel, wherein the channel has the same or a larger cross-section at its end facing the low-pressure chamber than at its end facing the recess with the pressure relief valve.
  • the pressure relief valve is connected to the low-pressure chamber or the low-pressure damper of the high-pressure fuel pump arranged in the low-pressure chamber.
  • This connection reduces pressure pulsations/volume flows on the pressure relief valve spring, thus reducing wear and cavitation erosion on the pressure relief valve.
  • cavitation erosion caused by steam in the delivery chamber and the "breathing" of the valve body can be avoided.
  • the back pressures that occur in the high-pressure system in the event of a full delivery fault can be reduced and the pump's delivery efficiency can be increased.
  • the possible tapering of the channel cross-section can potentially achieve acoustic advantages, as this can modify the natural frequency of the recess.
  • the present high-pressure fuel pump is in particular a piston pump.
  • a piston pump has a delivery chamber and a piston arranged therein, which can be driven in an oscillating manner.
  • the channel that connects the recess to the low-pressure chamber is formed in a wall of the pump housing, which delimits the low-pressure chamber towards the pump housing and separates the low-pressure chamber from the recess.
  • the channel can extend in a central longitudinal direction, in particular in a straight line.
  • the recess is connected to an outlet of the high-pressure fuel pump (i.e. to the high-pressure side), on which a connection flange can be provided, for example.
  • An outlet valve can be arranged parallel to the pressure relief valve.
  • the pressure relief valve can have several functions. Firstly, the pressure relief valve can ensure that the pressure in the rail does not exceed a specified value (e.g. in the event of pressure overshoots or hot shut-off). This ensures that the permissible load on the affected components is not exceeded. As long as the pressure in the rail is below the maximum permissible value, the pressure relief valve must seal off the low-pressure system or the delivery chamber in order to prevent a loss of pressure in the rail.
  • the pressure relief valve can have a valve body, a ball, a spring holder and/or a spring.
  • the central longitudinal axis of the channel and the central longitudinal axis of the low-pressure chamber and the central longitudinal axis of the pump housing can be arranged parallel to one another or congruent to one another. This makes it possible to achieve a centric arrangement of the channel in relation to the pump housing or the low-pressure chamber. This contributes to a good connection of the pressure relief valve to the low-pressure damper. Pressure pulsations on the pressure relief valve and movements of the pressure relief valve spring can be reduced again.
  • the cross-section of the channel can increase conically along the central longitudinal axis of the channel towards the low-pressure chamber. Acoustic advantages can be achieved because the natural frequency of the recess can be modified.
  • the channel can have a first axial channel section and a second axial channel section, the second channel section facing the low-pressure chamber and having a larger cross-section than the first channel section.
  • the channel is designed as a stepped channel, e.g. as a stepped bore, which widens towards the low-pressure chamber or whose larger cross-section (e.g. larger diameter) faces the low-pressure chamber.
  • a delivery chamber can be provided in which a piston runs, the wall that separates the delivery chamber and the recess in which the pressure relief valve is arranged being designed to be channel-free. This contributes to a good connection of the pressure relief valve to the low-pressure chamber or the low-pressure damper arranged in the low-pressure chamber. There is no direct flow connection from the delivery chamber to the recess via the wall.
  • the central longitudinal axis of the recess for the pressure relief valve can be oriented orthogonally to the central longitudinal axis of the pump housing. This contributes to a compact design of the high-pressure fuel pump, since a low installation height can be achieved.
  • FIG. 1 shows a fuel injection system 10 for an internal combustion engine in a schematic representation.
  • Fuel is fed from a fuel tank 12 via a suction line 14 by means of a pre-feed pump 16 into a low-pressure line 18 and from there to a low-pressure connection 20 (inlet 20) of a high-pressure fuel pump 22.
  • a fuel e.g. gasoline
  • a fuel pump 22 is compressed to a high pressure in the high-pressure fuel pump 22 and fed through a high-pressure connection 24 (outlet 24) via a high-pressure rail 25 and a high-pressure injector 26 to a combustion chamber 28 of the internal combustion engine.
  • the fuel can be mixed with air supplied via an intake manifold 30 and ignited, e.g. by a spark generated by a spark plug.
  • a portion of the fuel supplied via the low-pressure connection 20 of the high-pressure fuel pump 22 can, after flowing through the high-pressure fuel pump 22 without compression, be led out of the high-pressure fuel pump 22 again through a further low-pressure connection 32 and into the intake manifold 30 via a low-pressure injector 34. There, this portion of the fuel can mix with the supplied air before the mixture reaches the combustion chamber 28.
  • the high-pressure fuel pump 22 is designed as a piston pump, wherein a piston 36 can be driven, for example, by means of a cam disk 38 (direction of movement oriented vertically in the drawing).
  • the high-pressure fuel pump 22 is described below with reference to Figure 2 explained in more detail.
  • the high-pressure fuel pump 22 has a pump housing 40 on or in which the components of the high-pressure fuel pump 22 are arranged.
  • a pump cover 42 is mounted on the pump housing 40 in a manner that cannot be removed without destruction and can be connected to the pump housing 40, for example welded.
  • the pump cover 42, together with the Pump housing 40 has a low-pressure chamber 44.
  • a low-pressure damper 45 is arranged in the low-pressure chamber 44.
  • connection piece (inlet piece) is mounted on the side of the pump housing 40 at the inlet 20 (in Fig.2 not shown).
  • the inlet 20 or the inlet-side connection piece is fluidly connected to the low-pressure chamber 44 via a connecting channel (not shown).
  • the low-pressure chamber 44 is fluidly connected to the delivery chamber 50 in which the piston 36 is arranged via a further connecting channel (not shown). This allows fuel to be guided from the low-pressure chamber 44 into the delivery chamber 50.
  • a connection piece 52 (outlet piece 52) is attached to the outlet 24 on the side of the pump housing 40.
  • An outlet valve 54 and a pressure relief valve 56 are also provided on the outlet 24.
  • the pressure relief valve 56 is arranged in a recess 58 formed in the pump housing 40.
  • the outlet valve 54 is arranged in a recess 60 formed in the pump housing 40.
  • the recesses 58, 60 are oriented parallel to one another and are fluidly connected to the outlet 24 or the connection piece 52.
  • the outlet valve 54 is also fluidly connected to the delivery chamber 50 via a passage 62.
  • the pressure relief valve 56 consists in particular of several components and can, for example, have a valve body 64, a ball 66, a spring holder 68 and/or a spring 70 (see enlarged partial section in Fig.2 ).
  • the recess 58 in which the pressure relief valve 56 is arranged, is fluidly connected to the low-pressure chamber 44 via a channel 72.
  • the channel 72 is formed in a wall 74 of the pump housing 40, which delimits the low-pressure chamber 44 towards the pump housing 40 and separates the low-pressure chamber 44 from the recess 58.
  • the channel 72 extends along a central longitudinal axis 76, in particular in a straight line.
  • the channel 72 has, on its side facing the low-pressure chamber 44, end has the same or a larger cross-section than at its end facing the recess 58 with the pressure relief valve 56.
  • the central longitudinal axis 76 of the channel 72 and the central longitudinal axis 77 of the low-pressure chamber 44 and/or the central longitudinal axis 78 of the pump housing 40 are arranged parallel to one another or congruent to one another.
  • the channel 72 has a first axial channel section 80 and a second axial channel section 82, the second channel section 82 facing the low-pressure chamber 44 and having a larger cross-section than the first channel section 80.
  • the channel 72 is designed as a stepped channel in the form of a stepped bore that widens towards the low-pressure chamber 44 (smaller diameter in the first channel section 80 than in the second channel section 82).
  • the cross-section of the channel 72 can be tapered along the central longitudinal axis 76 of the channel 72 towards the low-pressure chamber 44.
  • the delivery chamber 50 in which the piston 36 runs, is separated from the recess 58, in which the pressure relief valve 56 is arranged, by means of a wall 84.
  • the wall 84 is designed to be channel-free. In other words, there is no direct flow connection between the delivery chamber 50 and the recess 58 through the wall 84.
  • the central longitudinal axis 86 of the recess 58 for the pressure relief valve 56 is oriented orthogonally to the central longitudinal axis 78 of the pump housing 40.
  • the medium (fuel) in the delivery chamber 50 is displaced and conveyed via the outlet valve 54, which opens away from the delivery chamber 50, and the outlet 24 or the connection piece 52, for example to a high-pressure rail 25.
  • the pressure relief valve 56 is connected anti-parallel to the outlet valve 54 (opposite opening direction) in order to prevent impermissibly high pressures in the high-pressure area of the fuel system 10.

Landscapes

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

Claims (6)

  1. Pompe à carburant haute pression (22) pour un système (10) d'injection de carburant d'un moteur à combustion interne, comprenant un corps de pompe (40) et un couvercle de pompe (42) monté sur le corps de pompe (40), qui délimite avec le corps de pompe (40) une chambre basse pression (44), un évidement (58) étant formé dans le corps de pompe (40), dans lequel est agencée une soupape (56) de limitation de pression, l'évidement (58) étant en liaison d'écoulement avec la chambre basse pression (44) par l'intermédiaire d'un canal (72), le canal (72) présentant à son extrémité tournée vers la chambre basse pression (44) la même section ou une section plus grande qu'à son extrémité tournée vers l'évidement (58), et caractérisée en ce que l'axe longitudinal central (76) du canal (72) et l'axe longitudinal central (77) de la chambre à basse pression (44) sont congruents l'un par rapport à l'autre.
  2. Pompe à carburant haute pression (22) selon la revendication 1, caractérisée en ce que l'axe longitudinal central (76) du canal (72) et l'axe longitudinal central (78) du corps de pompe (40) sont agencés parallèlement l'un à l'autre ou sont congruents l'un à l'autre.
  3. Pompe à carburant haute pression (22) selon la revendication 1 ou la revendication 2, caractérisée en ce que la section transversale du canal (72) augmente de manière conique le long de l'axe longitudinal central (76) du canal (72) vers la chambre basse pression (44).
  4. Pompe à carburant haute pression (22) selon la revendication 1 ou la revendication 2, caractérisée en ce que le canal (72) comprend une première portion axiale (80) de canal et une deuxième portion axiale (82) de canal, la deuxième portion de canal (82) étant tournée vers la chambre basse pression (44) et présentant une section transversale plus grande que la première portion de canal (80).
  5. Pompe à carburant haute pression (22) selon l'une des revendications précédentes, caractérisée en ce qu'il est prévu une chambre de refoulement (50) dans laquelle se déplace un piston (36), la paroi (84) qui sépare l'un de l'autre la chambre de refoulement (50) et l'évidement (58) dans lequel est agencée la soupape (56) de limitation de pression étant réalisée sans canal.
  6. Pompe à carburant haute pression (22) selon l'une des revendications précédentes, caractérisée en ce que l'axe longitudinal central (86) de l'évidement (58) pour la soupape (56) de limitation de pression est orienté orthogonalement à l'axe longitudinal central (78) du corps de pompe (40).
EP21772708.0A 2020-09-22 2021-08-30 Pompe à carburant haute pression pour système d'injection de carburant d'un moteur à combustion interne Active EP4217601B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102020211798.5A DE102020211798A1 (de) 2020-09-22 2020-09-22 Hochdruck-Kraftstoffpumpe für ein Kraftstoff-Einspritzsystem einer Brennkraftmaschine
PCT/EP2021/073827 WO2022063521A1 (fr) 2020-09-22 2021-08-30 Pompe à carburant haute pression pour système d'injection de carburant d'un moteur à combustion interne

Publications (2)

Publication Number Publication Date
EP4217601A1 EP4217601A1 (fr) 2023-08-02
EP4217601B1 true EP4217601B1 (fr) 2024-12-25

Family

ID=77801673

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21772708.0A Active EP4217601B1 (fr) 2020-09-22 2021-08-30 Pompe à carburant haute pression pour système d'injection de carburant d'un moteur à combustion interne

Country Status (8)

Country Link
US (1) US20230358195A1 (fr)
EP (1) EP4217601B1 (fr)
JP (1) JP7505121B2 (fr)
KR (1) KR20230070267A (fr)
CN (1) CN116194666B (fr)
BR (1) BR112023005090A2 (fr)
DE (1) DE102020211798A1 (fr)
WO (1) WO2022063521A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102021208122A1 (de) * 2021-07-28 2023-02-02 Robert Bosch Gesellschaft mit beschränkter Haftung Kraftstoff-Hochdruckpumpe
KR20240171844A (ko) 2023-05-31 2024-12-09 엘지디스플레이 주식회사 표시장치

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3823060B2 (ja) * 2002-03-04 2006-09-20 株式会社日立製作所 高圧燃料供給ポンプ
DE10327411B4 (de) 2002-10-15 2015-12-17 Robert Bosch Gmbh Druckbegrenzungsventil sowie Kraftstoffsystem mit einem solchen Druckbegrenzungsventil
DE102006061558A1 (de) * 2006-12-27 2008-07-03 Robert Bosch Gmbh Kraftstoff-Fördereinrichtung für eine Brennkraftmaschine
JP6310026B2 (ja) * 2016-09-20 2018-04-11 日立オートモティブシステムズ株式会社 燃料の圧力脈動低減機構、及びそれを備えた内燃機関の高圧燃料供給ポンプ
JP2019015186A (ja) * 2017-07-04 2019-01-31 株式会社ケーヒン 燃料ポンプ
JP2019015244A (ja) * 2017-07-07 2019-01-31 株式会社ケーヒン 燃料ポンプ
US10865900B2 (en) * 2018-03-27 2020-12-15 Keihin Corporation Valve unit fixing structure and fluid pump using the same
JP7117871B2 (ja) 2018-03-27 2022-08-15 日立Astemo株式会社 流体ポンプ
JP2019173638A (ja) 2018-03-28 2019-10-10 株式会社ケーヒン 燃料ポンプ
DE102018211237A1 (de) * 2018-07-07 2020-01-09 Robert Bosch Gmbh Kraftstoffpumpe
DE102018221702A1 (de) * 2018-12-13 2020-06-18 Robert Bosch Gmbh Kraftstoff-Hochdruckpumpe

Also Published As

Publication number Publication date
US20230358195A1 (en) 2023-11-09
CN116194666B (zh) 2026-03-13
BR112023005090A2 (pt) 2023-04-18
EP4217601A1 (fr) 2023-08-02
WO2022063521A1 (fr) 2022-03-31
JP7505121B2 (ja) 2024-06-24
JP2023541709A (ja) 2023-10-03
KR20230070267A (ko) 2023-05-22
DE102020211798A1 (de) 2022-03-24
CN116194666A (zh) 2023-05-30

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