EP4217601A1 - 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

Info

Publication number
EP4217601A1
EP4217601A1 EP21772708.0A EP21772708A EP4217601A1 EP 4217601 A1 EP4217601 A1 EP 4217601A1 EP 21772708 A EP21772708 A EP 21772708A EP 4217601 A1 EP4217601 A1 EP 4217601A1
Authority
EP
European Patent Office
Prior art keywords
pressure
low
channel
pump
recess
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.)
Pending
Application number
EP21772708.0A
Other languages
German (de)
English (en)
Inventor
Rainer Kornhaas
Stephan Wehr
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 EP4217601A1 publication Critical patent/EP4217601A1/fr
Pending legal-status Critical Current

Links

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
    • F02M59/44—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
    • 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

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 known, for example, from DE 102018211 237 A1.
  • This high-pressure fuel pump has a pump housing and a pump cover mounted thereon with a low-pressure chamber.
  • a pressure-limiting valve is arranged in a recess formed in the pump housing, the recess being flow-connected to a pumping chamber in which a piston runs.
  • Another fuel pump is also known from DE 10327 411 A1. In such high-pressure fuel pumps, impermissible wear and cavitation erosion can occur on the pressure-limiting valve.
  • a high-pressure fuel pump for a fuel injection system of an internal combustion engine having a pump housing and a pump housing mounted on the pump housing (possibly not detachable from the pump housing non-destructively) Has pump cover, which delimits a low-pressure chamber together with the pump housing.
  • a recess is formed in the pump housing, in which a pressure-limiting valve is arranged. The recess is flow-connected to the low-pressure chamber via a channel, the channel having 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-limiting valve.
  • the pressure-limiting valve is connected to the low-pressure chamber or to the low-pressure damper of the high-pressure fuel pump arranged in the low-pressure chamber.
  • This connection ensures that pressure pulsations/volume flows on the spring of the pressure relief valve are reduced and thus wear and cavitation erosion on the pressure relief valve can be reduced.
  • cavitation erosion due to steam in the pumping chamber and "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 error can be reduced and the delivery rate of the pump can be increased.
  • acoustic advantages can be achieved, if necessary, since the natural frequency of the recess can be modified as a result.
  • the present high-pressure fuel pump is in particular a piston pump.
  • a piston pump has a pumping chamber and a piston arranged therein, which can be driven in an oscillating manner.
  • the channel that connects the recess to the low-pressure space in terms of flow is formed in a wall of the pump housing, which delimits the low-pressure space toward the pump housing and separates the low-pressure space from the recess.
  • the channel can extend along a central longitudinal direction, in particular in a straight line.
  • the recess is flow-connected to an outlet of the high-pressure fuel pump (ie to the high-pressure side), on which, for example, a connecting flange can be provided.
  • An outlet valve can be arranged parallel to the pressure-limiting valve.
  • the pressure relief valve can have several functions. On the one hand, 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 soak). 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 against the low-pressure system or the pumping chamber in order to prevent pressure loss in the rail.
  • the pressure relief valve can have a valve body, a ball, a spring retainer and/or a spring.
  • the central longitudinal axis of the channel and the central longitudinal axis of the low-pressure chamber and/or the central longitudinal axis of the pump housing can be arranged parallel to one another or congruent to one another.
  • a centric arrangement of the channel in relation to the pump housing or the low-pressure chamber can be achieved. This contributes to a good connection between the pressure relief valve and the low-pressure damper. Pressure pulsations at the pressure relief valve and movements of the spring of the pressure relief valve can be reduced again.
  • the cross section of the duct can increase conically along the central longitudinal axis of the duct towards the low-pressure space. Acoustic advantages can be achieved in this way, since the natural frequency of the recess can be modified as a result.
  • the channel can have a first axial channel section and a second axial channel section, the second Channel section faces the low-pressure chamber and has a larger cross section than the first channel section.
  • the excitation of the vibrations can also be dampened in this way, so that acoustic advantages can be achieved.
  • the channel is designed as a stepped channel, for example as a stepped bore, which widens towards the low-pressure space or whose larger cross section (for example larger diameter) faces the low-pressure space.
  • a pumping chamber can be provided in which a piston runs, the wall separating the pumping chamber and the recess in which the pressure-limiting valve is arranged being channel-free. This contributes to a good connection of the pressure-limiting valve to the low-pressure space or to the low-pressure damper arranged in the low-pressure space. There is no direct flow connection from the pumping chamber to the recess via the wall.
  • the central longitudinal axis of the recess for the pressure-limiting 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 overall height can be achieved.
  • FIG. 1 shows a schematic representation of a fuel system for an internal combustion engine
  • FIG. 2 shows an embodiment of the high-pressure fuel pump in a longitudinal section.
  • FIG. 1 shows a schematic representation of a fuel injection system 10 for an internal combustion engine. Fuel is pumped from a fuel tank 12 via a suction line 14 by means of a pre-supply 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 for example gasoline, 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, for example by a spark generated by a spark plug.
  • part of the fuel supplied to the high-pressure fuel pump 22 via the low-pressure connection 20 can, after flowing through the high-pressure fuel pump 22 without compression, be guided out of the high-pressure fuel pump 22 again through a further low-pressure connection 32 and via a low-pressure injector 34 into the intake manifold 30 will. There, this part 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, with a piston 36 being able to 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 explained in more detail below with reference to FIG.
  • 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 non-destructively detachable manner and can be connected, for example welded, to the pump housing 40 .
  • the pump cover 42 together with the pump housing 40, delimits a low-pressure chamber 44.
  • a low-pressure damper 45 is arranged in the low-pressure chamber 44.
  • a connecting piece (inlet piece) is mounted on the side of the pump housing 40 at the inlet 20 (not shown in FIG. 2).
  • the inlet 20 or the connection piece on the inlet side is connected via a connecting channel (not shown).
  • flow-connected to the low-pressure chamber 44 Via a further connecting channel (not shown), the low-pressure chamber 44 is flow-connected to the delivery chamber 50 in which the piston 36 is arranged.
  • fuel can be guided from the low-pressure chamber 44 into the pumping chamber 50 .
  • a connection piece 52 (outlet connection piece 52) is fastened to the side of the pump housing 40 at the outlet 24.
  • An outlet valve 54 and a pressure relief valve 56 are also provided at the outlet 24 .
  • the pressure-limiting 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 flow-connected to the outlet 24 or the connecting piece 52 .
  • the outlet valve 54 is also flow-connected to the pumping chamber 50 via a passage 62 .
  • the pressure-limiting valve 56 consists in particular of several components and can have, for example, a valve body 64, a ball 66, a spring seat 68 and/or a spring 70 (cf. enlarged detail in FIG. 2).
  • the recess 58 in which the pressure-limiting valve 56 is arranged is flow-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 space 44 towards the pump housing 40 and separates the low-pressure space 44 from the recess 58 .
  • the channel 72 extends along a central longitudinal axis 76, in particular in a straight line. At its end facing the low-pressure chamber 44 , the channel 72 has the same or a larger cross section than at its end facing the recess 58 with the pressure-limiting 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 are congruent to one another.
  • channel 72 has a first axial channel section 80 and a second axial channel section 82 , second channel section 82 facing low-pressure chamber 44 and having a larger cross section than first channel section 80 .
  • the duct 72 is designed as a stepped duct in the form of a stepped bore, which widens towards the low-pressure chamber 44 (smaller diameter in the first duct section 80 than in the second duct section 82).
  • the cross section of the channel 72 along the central longitudinal axis 76 of the channel 72 can take a conical shape towards the low-pressure chamber 44 .
  • the delivery chamber 50 in which the piston 36 runs, is separated by a wall 84 from the recess 58 in which the pressure-limiting valve 56 is arranged.
  • the wall 84 is designed without channels. In other words, there is no direct flow connection between the pumping chamber 50 and the recess 58 through the wall 84.
  • the central longitudinal axis 86 of the recess 58 for the pressure-limiting 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 by an upward movement of the piston 36 and conveyed via the outlet valve 54, which opens away from the delivery chamber 50, and the outlet 24 or the connecting piece 52, for example to a high-pressure rail 25.
  • the pressure-limiting 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)

Abstract

L'invention se rapporte à une pompe à carburant haute pression (22) pour un système d'injection de carburant (10) d'un moteur à combustion interne, ladite pompe à carburant comprenant un carter (40) de pompe et un couvercle (42) de pompe qui est monté sur le carter (40) de pompe et qui, conjointement avec le carter (40) de pompe, délimite une chambre basse pression (44), un évidement (58) étant formé dans le carter (40) de pompe, dans ledit évidement se trouve une soupape de limitation de pression (56), l'évidement (58) étant en communication fluidique avec la chambre basse pression (44) par l'intermédiaire d'un canal (72), le canal (72) ayant la même section transversale ou une section transversale plus grande au niveau de son extrémité faisant face à la chambre basse pression (44) qu'au niveau de son extrémité faisant face à l'évidement (58).
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 Pending EP4217601A1 (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 (1)

Publication Number Publication Date
EP4217601A1 true EP4217601A1 (fr) 2023-08-02

Family

ID=77801673

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21772708.0A Pending EP4217601A1 (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) EP4217601A1 (fr)
JP (1) JP7505121B2 (fr)
KR (1) KR20230070267A (fr)
CN (1) CN116194666A (fr)
BR (1) BR112023005090A2 (fr)
DE (1) DE102020211798A1 (fr)
WO (1) WO2022063521A1 (fr)

Families Citing this family (1)

* 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

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
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

Also Published As

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

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