EP3894687B1 - Pompe à carburant à haute pression - Google Patents

Pompe à carburant à haute pression Download PDF

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Publication number
EP3894687B1
EP3894687B1 EP19806179.8A EP19806179A EP3894687B1 EP 3894687 B1 EP3894687 B1 EP 3894687B1 EP 19806179 A EP19806179 A EP 19806179A EP 3894687 B1 EP3894687 B1 EP 3894687B1
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EP
European Patent Office
Prior art keywords
pressure
pump housing
flow path
fuel pump
relief valve
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.)
Active
Application number
EP19806179.8A
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German (de)
English (en)
Other versions
EP3894687A1 (fr
Inventor
Matthias Hartweg
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
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Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP3894687A1 publication Critical patent/EP3894687A1/fr
Application granted granted Critical
Publication of EP3894687B1 publication Critical patent/EP3894687B1/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
    • F02M59/46—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
    • F02M59/44—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
    • F02M59/48—Assembling; Disassembling; Replacing
    • 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
    • F02M63/0012—Valves
    • F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
    • F02M63/005—Pressure relief 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
    • 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
    • F02M63/023—Means for varying pressure in common rails
    • F02M63/0235—Means for varying pressure in common rails by bleeding fuel pressure
    • F02M63/0245—Means for varying pressure in common rails by bleeding fuel pressure between the high pressure pump and the common rail
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
    • F02M2200/8061—Fuel injection apparatus manufacture, repair or assembly involving press-fit, i.e. interference or friction fit

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 from the DE 10 2005 007 806 A1 known and includes a pump housing and a pressure relief valve.
  • the pressure relief valve connects a high-pressure outlet to a delivery chamber of the high-pressure fuel pump.
  • the pressure relief valve opens when a pressure difference between the high-pressure outlet and the delivery chamber of the high-pressure fuel pump exceeds a limit value.
  • the pressure relief valve therefore prevents the pressure in the high-pressure outlet from being unacceptably high.
  • the pressure relief valve therefore essentially has two functions: on the one hand, to control the pressure from the high-pressure outlet when a maximum permissible pressure is exceeded, and on the other hand, to seal the high-pressure outlet and the components connected to it (e.g. a fuel rail) from the delivery chamber at a pressure below that maximum permissible pressure.
  • WO 2018/164026 A1 and DE 10 2008 059638 A1 reveal high pressure fuel pumps.
  • the high-pressure fuel pump according to the invention is used to deliver fuel in a fuel injection system of an internal combustion engine.
  • Gasoline or diesel is preferably used as fuel.
  • the high-pressure fuel pump compresses the fuel to a high pressure and delivers it, for example, to a fuel rail to which injection devices are connected, which inject the fuel directly into assigned combustion chambers of the internal combustion engine.
  • the high-pressure fuel pump includes a pressure relief valve.
  • the pressure relief valve limits the pressure on or in a high-pressure outlet of the high-pressure fuel pump to a maximum permissible value. If the pressure prevailing there exceeds the opening pressure of the pressure relief valve, the pressure relief valve opens so that fuel is removed from the high pressure outlet.
  • the high-pressure fuel pump also includes a pump housing which has a drive-side end area.
  • a pump housing which has a drive-side end area.
  • front area in no way means that the pump housing must have a rotationally symmetrical shape.
  • the pump housing as a whole has a longitudinal axis that runs parallel to a delivery piston.
  • the drive-side end region is that end region of the pump housing that points towards a drive of the delivery piston.
  • Such a drive usually includes a camshaft or an eccentric shaft.
  • the pressure relief valve is arranged in a discharge flow path in the pump housing, which opens into the drive-side end region of the pump housing just mentioned.
  • wear-relevant pressure pulsations from a delivery chamber of the high-pressure fuel pump are avoided, as can occur when the discharge flow path opens into the delivery chamber.
  • the dead volume in the delivery chamber of the high-pressure fuel pump is significantly reduced compared to a discharge flow path opening into the delivery chamber, whereby the degree of delivery of the high-pressure fuel pump can be increased.
  • the housing strength of the high-pressure fuel pump can also be improved at critical points by rearranging the pressure relief valve in the pump housing of the high-pressure fuel pump be increased. Overall, this increases the efficiency of the high-pressure fuel pump and increases its reliability and service life.
  • the discharge flow path opens into a step space in which the step of the delivery piston is arranged and which is formed on the drive-side end region of the pump housing.
  • the step space is usually sealed from the drive and the lubricants present there by a seal holder and a piston seal and is connected via a flow path to a low-pressure area of the high-pressure fuel pump.
  • the opening of the discharge flow path into the step space creates a reliable relief option for the high-pressure outlet in the event of an opening pressure relief valve, without the risk of fuel entering the drive and the lubricants present there.
  • a fluid space is formed between an upper end area of the pump housing opposite the drive-side end area and a hood-like housing cover carried by the upper end area, in which a membrane pressure damper is accommodated.
  • the pressure relief valve is designed as a spring-loaded check valve.
  • a longitudinal axis of the pressure relief valve is arranged parallel to a longitudinal axis of a delivery piston.
  • this allows a reduction in the overall height of the high-pressure fuel pump, so that it can also be used in installation situations with cramped conditions space conditions can be used.
  • the pressure relief valve is inserted into the discharge flow path from the mouth on the drive-side end region. This considerably simplifies the assembly of the pressure relief valve, since the front area on the drive side is usually very easily accessible.
  • the pressure relief valve is held in a press fit in the discharge flow path. In this way, the pressure relief valve can be mounted and held easily and reliably.
  • a section of the pressure relief valve in particular a valve body, is formed by a section of the valve housing.
  • the valve body can be made directly from the housing material or incorporated directly into the housing. This reduces the number of components to be manufactured and joined or pressed, thereby simplifying production.
  • the high-pressure outlet is arranged laterally on the pump housing, viewed in an axial direction (i.e. in the direction of the longitudinal axis) of the pump housing, and that an outlet flow path, which leads from a delivery chamber to the high-pressure outlet, in the axial direction of the pump housing is arranged laterally from a section of the discharge flow path that opens into the high-pressure connection. This also allows the overall height of the high-pressure fuel pump to be reduced again.
  • the discharge flow path comprises two at least approximately orthogonal and intersecting blind bores, one of which extends from the high-pressure outlet in a substantially radial or tangential direction of the pump housing, and the other of which extends from the drive side Front area extends in a substantially axial direction of the pump housing.
  • blind holes can be easily realized, which means that the manufacturing costs of the high-pressure fuel pump can be kept low.
  • a high-pressure fuel pump for an internal combustion engine has the overall reference number 10.
  • the high-pressure fuel pump 10 has an essentially cylindrical pump housing 12, in or on which the essential components of the high-pressure fuel pump 10 are arranged.
  • the high-pressure fuel pump 10 has an inlet/quantity control valve 14, a delivery piston 22 which projects into a delivery chamber 18 with a first end region 16 and can be set in a back and forth movement at a second end region 20 by a drive shaft (not shown).
  • a high-pressure outlet 24 there is a flat area on the side of the pump housing 12, which forms a high-pressure outlet 24. This is about one outside the cutting plane of Figure 1 lying and therefore in Figure 1 Invisible outlet valve can be connected to the delivery chamber 18.
  • An outlet connection 26 is attached to the high-pressure outlet 24. This is fluidly connected to a high-pressure region 28, which can be, for example, a fuel rail to which a plurality of injection devices are connected, which inject the fuel directly into assigned combustion chambers of the internal combustion engine.
  • the pump housing 12 is not exactly rotationally symmetrical, it nevertheless has a longitudinal axis 30.
  • An in Figure 1 The upper end region 31 of the pump housing 12 carries a hood-like housing cover 32, to which an inlet connection 34 is attached, which is connected to a low-pressure region 36.
  • the low-pressure area 36 can include, for example, an electric pre-feed pump.
  • a fluid space (without reference number) is formed, in which a membrane pressure damper 38 is accommodated.
  • the delivery piston 22 is designed as a stepped piston with an in Figure 1 upper section with larger diameter and an in Figure 1 lower section with smaller diameter.
  • a step or paragraph between the two Sections contributes in Figure 1 overall the reference number 40.
  • Figure 1 can be seen is located at the Figure 1 shown position of the delivery piston 22, the step 40 just outside of the pump housing 12, in a so-called "step space" 42, which is between an in Figure 1 lower drive-side end region 44 of the pump housing 12 and a seal holder 46 made as a sheet metal part, which is held in a press fit in a tubular fastening socket 48 of the pump housing 12 on its drive-side end region 44.
  • the seal holder 46 carries a piston seal 50, which seals the step space 42 from the drive, not shown, which is arranged below the second end region 20 of the delivery piston 22.
  • a discharge flow path 52 which in the present case is formed, for example, by two mutually orthogonal and intersecting blind holes 54 and 56.
  • the blind hole 54 extends in a substantially radial direction of the pump housing 12 from the high-pressure outlet 24, and the blind hole 56 extends from the drive-side end region 44 in a substantially axial direction of the pump housing 12.
  • the axial blind hole 56 is designed as a stepped bore a section (without reference number) with a larger diameter extending from the drive-side end region 44.
  • a pressure relief valve 58 is arranged in this, which opens towards the drive-side end region 44.
  • the pressure relief valve 58 is designed as a spring-loaded check valve. It includes (see Figure 3 ) a valve element 60 designed as a valve ball, although other valve elements can of course also be used, for example a conical valve element.
  • a valve spring 62 which in the present case is designed as a helical compression spring, carries on its in Figure 1 upper and in Figure 3 left end a ball holder 64 and acts on the valve element 60 against a valve body 66, on which a valve seat 68 which cooperates sealingly with the valve element 60 when the pressure relief valve 58 is closed is formed.
  • the end of the valve spring 62 facing away from the valve body 66 is supported on a sleeve 70 which, like the valve body 66, is pressed into the blind hole 56, i.e. held there in a press fit.
  • fuel for example gasoline or diesel
  • the inlet and quantity control valve 14 During operation, fuel, for example gasoline or diesel, is sucked into the delivery chamber 18 via the inlet and quantity control valve 14 by the delivery piston 18 during a suction stroke.
  • the fuel located in the delivery chamber 18 is compressed and expelled into the high-pressure area 28 via the outlet valve and the outlet port 26.
  • the amount of fuel that is ejected during a delivery stroke is adjusted by the electromagnetically actuated inlet and quantity control valve 14.
  • the pressure relief valve 58 opens, allowing fuel to flow from the high-pressure area 28 into the step space 42.
  • the step space 42 can be connected via flow paths (not shown here), for example to an area located upstream of the delivery space 18, which in turn is connected to the low-pressure area 36.

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 (8)

  1. Pompe à carburant haute pression (10) pour un système d'injection de carburant d'un moteur à combustion interne, avec un boîtier de pompe (12) qui présente une zone frontale côté entraînement (44), une sortie haute pression (24) et une soupape de limitation de pression (58), qui, à l'état ouvert, évacue du carburant de la sortie haute pression (24), la soupape de limitation de pression (58) étant agencée dans une voie d'écoulement d'évacuation (52) dans le boîtier de pompe (12), qui débouche dans la zone frontale côté entraînement (44) du boîtier de pompe (12),
    la pompe à carburant haute pression présentant un piston de refoulement étagé (22), la voie d'écoulement d'évacuation (52) débouchant dans un espace d'étage (42) dans lequel est agencé l'étage (40) du piston de refoulement (22) et qui est réalisé au niveau de la zone frontale côté entraînement (44) du boîtier de pompe (12), et un espace de fluide étant réalisé entre une zone frontale supérieure (31) du boîtier de pompe (12), opposée à la zone frontale côté entraînement (44), et un couvercle de boîtier (32) en forme de capot, porté par la zone frontale supérieure (31), dans lequel est logé un amortisseur de pression à membrane (38).
  2. Pompe à carburant haute pression (10) selon au moins l'une quelconque des revendications précédentes, caractérisée en ce que la soupape de limitation de pression (58) est réalisée sous la forme d'une soupape anti-retour sollicitée par ressort.
  3. Pompe à carburant haute pression (10) selon au moins l'une quelconque des revendications précédentes, caractérisée en ce qu'un axe longitudinal de la soupape de limitation de pression (58) est agencé parallèlement à un axe longitudinal (30) d'un piston de refoulement (22) .
  4. Pompe à carburant haute pression (10) selon au moins l'une quelconque des revendications précédentes, caractérisée en ce que la soupape de limitation de pression (58) ou au moins une partie de celle-ci est insérée dans la voie d'écoulement d'évacuation (52) à partir de l'embouchure au niveau de la zone frontale côté entraînement (44).
  5. Pompe à carburant haute pression (10) selon au moins l'une quelconque des revendications précédentes, caractérisée en ce que la soupape de limitation de pression (58) ou au moins une partie de celle-ci est maintenue en ajustement serré dans la voie d'écoulement d'évacuation (52).
  6. Pompe à carburant haute pression selon au moins l'une quelconque des revendications précédentes, caractérisée en ce qu'une section de la soupape de limitation de pression, notamment un corps de soupape, est formée par une section du boîtier de soupape.
  7. Pompe à carburant haute pression (10) selon au moins l'une quelconque des revendications précédentes, caractérisée en ce que la sortie haute pression (24) est agencée sur le côté du boîtier de pompe (12), vu dans une direction axiale du boîtier de pompe (12), et en ce qu'une voie d'écoulement de sortie (72) menant d'un espace de refoulement (18) à la sortie haute pression (24) est agencée sur le côté d'une section de la voie d'écoulement d'évacuation (52) débouchant dans la sortie haute pression (24), vu dans la direction axiale du boîtier de pompe (12).
  8. Pompe à carburant haute pression (10) selon la revendication 8, caractérisée en ce que la voie d'écoulement d'évacuation (52) comprend deux trous borgnes orthogonaux et sécants (52, 54), dont l'un s'étend depuis la sortie haute pression (24) dans une direction essentiellement radiale ou tangentielle du boîtier de pompe (12), et dont l'autre s'étend depuis la zone frontale côté entraînement (44) dans une direction essentiellement axiale du boîtier de pompe (12).
EP19806179.8A 2018-12-13 2019-11-18 Pompe à carburant à haute pression Active EP3894687B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018221702.5A DE102018221702A1 (de) 2018-12-13 2018-12-13 Kraftstoff-Hochdruckpumpe
PCT/EP2019/081669 WO2020120075A1 (fr) 2018-12-13 2019-11-18 Pompe à carburant à haute pression

Publications (2)

Publication Number Publication Date
EP3894687A1 EP3894687A1 (fr) 2021-10-20
EP3894687B1 true EP3894687B1 (fr) 2024-01-10

Family

ID=68621279

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19806179.8A Active EP3894687B1 (fr) 2018-12-13 2019-11-18 Pompe à carburant à haute pression

Country Status (6)

Country Link
EP (1) EP3894687B1 (fr)
KR (1) KR20210099585A (fr)
CN (1) CN113167202B (fr)
DE (1) DE102018221702A1 (fr)
ES (1) ES2976573T3 (fr)
WO (1) WO2020120075A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102021208052A1 (de) * 2021-07-27 2023-02-02 Robert Bosch Gesellschaft mit beschränkter Haftung Kraftstoff-Hochdruckpumpe
DE102021208117A1 (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
DE10205493B4 (de) * 2002-02-09 2004-05-06 Robert Bosch Gmbh Radialkolbenpumpe
DE102005007806A1 (de) 2004-12-28 2006-07-06 Robert Bosch Gmbh Kolbenpumpe, insbesondere Hochdruck-Kraftstoffpumpe für eine Brennkraftmaschine eines Kraftfahrzeugs
DE102008059638A1 (de) * 2008-11-28 2010-06-02 Continental Automotive Gmbh Hochdruckpumpe
JP2013241835A (ja) * 2012-05-17 2013-12-05 Nippon Soken Inc 高圧燃料ポンプのリリーフ弁
DE102016218215A1 (de) * 2016-09-22 2018-03-22 Robert Bosch Gmbh Kraftstoff-Hochdruckpumpe
JP6766699B2 (ja) * 2017-03-07 2020-10-14 株式会社デンソー 高圧ポンプ

Also Published As

Publication number Publication date
ES2976573T3 (es) 2024-08-05
KR20210099585A (ko) 2021-08-12
EP3894687A1 (fr) 2021-10-20
DE102018221702A1 (de) 2020-06-18
CN113167202A (zh) 2021-07-23
WO2020120075A1 (fr) 2020-06-18
CN113167202B (zh) 2024-08-06

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