EP3894687A1 - Pompe à carburant à haute pression - Google Patents

Pompe à carburant à haute pression

Info

Publication number
EP3894687A1
EP3894687A1 EP19806179.8A EP19806179A EP3894687A1 EP 3894687 A1 EP3894687 A1 EP 3894687A1 EP 19806179 A EP19806179 A EP 19806179A EP 3894687 A1 EP3894687 A1 EP 3894687A1
Authority
EP
European Patent Office
Prior art keywords
pressure
pump housing
fuel pump
flow path
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.)
Granted
Application number
EP19806179.8A
Other languages
German (de)
English (en)
Other versions
EP3894687B1 (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
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 EP3894687A1 publication Critical patent/EP3894687A1/fr
Application granted granted Critical
Publication of EP3894687B1 publication Critical patent/EP3894687B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • 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 known from DE 10 2005 007 806 A1 and comprises a pump housing and a pressure relief valve. This is received in a recess in the pump housing. The pressure relief valve connects one in an open state
  • the pressure relief valve essentially has two functions: on the one hand, the control of the pressure from the high pressure outlet when a maximum permissible pressure is exceeded, and on the other hand, a sealing of the
  • High pressure outlet and the components connected to it opposite the delivery chamber at a pressure below the maximum permissible pressure.
  • the problem underlying the invention is solved by a high-pressure fuel pump with the features of claim 1.
  • Advantageous developments of the invention are specified in the subclaims.
  • the high-pressure fuel pump according to the invention serves to deliver fuel in a fuel injection system of an internal combustion engine. Gasoline or diesel is the preferred fuel.
  • the high-pressure fuel pump compresses the fuel to a high pressure and delivers it, for example, to a fuel ra i I, to the injectors
  • the high pressure fuel pump includes a pressure relief valve.
  • the pressure limiting valve limits the pressure at or in a high-pressure outlet of the high-pressure fuel pump to a maximum permissible value. If the pressure there exceeds the opening pressure of the pressure relief valve, this opens
  • Pressure relief valve so that fuel is discharged from the high pressure outlet.
  • the fuel high-pressure pump also includes a pump housing which has an end region on the drive side.
  • a pump housing which has an end region on the drive side.
  • head 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 which runs parallel to a delivery piston.
  • the drive-side end area is that end area of the pump housing that points toward a drive of the delivery piston.
  • Such a drive usually includes a camshaft or a
  • the pressure relief valve is arranged in a discharge flow path in the pump housing which opens into the end region of the pump housing just mentioned on the drive side. In this way, 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 considerably reduced compared to a discharge flow path that opens into the delivery chamber, whereby the delivery rate of the high-pressure fuel pump can be increased.
  • the housing strength of the high-pressure fuel pump can also be changed at critical points
  • Pressure relief valve in the pump housing of the high-pressure fuel pump be increased. Overall, the efficiency of the high-pressure fuel pump is increased and its reliability and service life are increased.
  • the invention has a stepped delivery piston and that 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 room is opposite the drive and the existing ones
  • Lubricants are usually sealed by a seal holder and a piston seal and connected to a low-pressure area of the high-pressure fuel pump via a flow path. Through the mouth of the discharge flow path in the step room in the case of an opening
  • Pressure relief valve created a reliable relief option for the high pressure outlet without the risk of entry of
  • Pressure relief valve is designed as a spring-loaded check valve. Such is inexpensive to manufacture and works reliably. It is also small in size.
  • 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 this also in
  • Pressure relief valve is inserted into the discharge flow path from the mouth on the drive end area. As a result, the assembly of the pressure relief valve is considerably simplified since the drive side
  • Forehead area is usually very accessible.
  • the pressure limiting valve is held in a press fit in the discharge flow path. In this way, the pressure relief valve can be easily and reliably installed and held.
  • a section of the pressure limiting 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 can be incorporated directly into the housing.
  • High-pressure outlet seen in an axial direction (ie in the direction of the longitudinal axis) of the pump housing is arranged laterally on the pump housing, and that an outlet flow path leading from a delivery chamber to the
  • High-pressure outlet leads viewed in the axial direction of the pump housing, is arranged laterally from a section of the discharge flow path opening into the high-pressure connection. This can also further reduce the overall height of the high-pressure fuel pump.
  • the discharge flow path comprises two at least approximately orthogonal and intersecting blind bores, one of which is in a substantially radial or tangential direction from the high pressure outlet
  • Figure 1 is a partial section through a high pressure fuel pump with a pressure relief valve
  • Figure 2 is a side perspective view of a high pressure outlet of the high pressure fuel pump of Figure 1;
  • FIG. 1 components of the pressure relief valve of Figure 1.
  • a high-pressure fuel pump for an internal combustion engine (not shown in detail) bears the reference number 10 overall.
  • the high-pressure fuel pump 10 has an essentially cylindrical overall
  • the high-pressure fuel pump 10 thus has an inlet / quantity control valve 14, one with a first end region 16 projecting into a delivery chamber 18 and at a second end region 20 through a drive shaft (not shown) into a back and forth
  • a high-pressure outlet 24 This can be connected to the delivery chamber 18 via an outlet valve lying outside the sectional plane of FIG. 1 and therefore not visible in FIG.
  • An outlet connector 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 associated combustion chambers of the internal combustion engine.
  • the pump housing 12 is not exactly rotationally symmetrical, it nevertheless has a longitudinal axis 30.
  • An upper end region 31 of the pump housing 12 in FIG. 1 carries a hood-like housing cover 32, to which an inlet connector 34 is attached, which is connected to a low-pressure region 36.
  • the low pressure region 36 can be, for example, an electrical one
  • a pump chamber 12 and the housing cover 32 form a fluid space (without reference number) in which a diaphragm pressure damper 38 is received.
  • the delivery piston 22 is designed as a stepped piston with an upper section in FIG. 1 with a larger diameter and a lower section in FIG. 1 with a smaller diameter.
  • a step or a paragraph between the two Sections in FIG. 1 bear the reference number 40 overall.
  • Delivery piston 22 the step 40 just outside of the pump housing 12, in a so-called “step space” 42, which is formed between a lower end portion 44 of the pump housing 12 on the drive side and a seal holder 46 made as a molded sheet metal part, which is in a tubular mounting piece 48 of the pump housing 12 is held in a press fit on its drive-side end region 44.
  • the seal holder 46 carries a piston seal 50, which the step space 42 with respect to the drive, not shown, which is below the second end portion 20 of the
  • Delivery piston 22 is arranged seals.
  • a discharge flow path 52 which in the present case is formed, for example, by two blind holes 54 and 56 that intersect one another orthogonally.
  • 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 as
  • Stepped bore made with a section (without reference number) with a larger diameter starting from the drive-side end region 44.
  • a pressure relief valve 58 is arranged, which for
  • the pressure relief valve 58 is designed as a spring-loaded check valve. It comprises (see FIG. 3) a valve ball
  • Valve element 60 whereby of course other valve elements can 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 a ball holder 64 at its upper end, which is the left in FIG. 1 and left in FIG cooperating valve seat 68 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, that is to say it is held there in a press fit. It can be seen from FIG. 1 that a longitudinal axis (not shown) of the
  • Pressure relief valve 58 parallel to the longitudinal axis 30 of the
  • drive-side end region 44 are inserted into the axial blind hole 56 of the discharge flow path 52.
  • High-pressure outlet 24 leads, seen in the axial direction of the pump housing 12, to the side of the section opening into the high-pressure outlet 24, namely the radial blind hole 54, of the discharge flow path 52.
  • the lateral offset has the reference numeral 74 in FIG. 1.
  • the outlet valve in FIG. 2 has a spoke-like design
  • fuel is delivered by the delivery piston 18 during a suction stroke
  • the fuel in the delivery chamber 18 is compressed and via the outlet valve and
  • the amount of fuel that is expelled during a delivery stroke is set by the electromagnetically actuated inlet and quantity control valve 14.
  • Pressure relief valve 58 whereby fuel can 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 from 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)

Abstract

L'invention concerne une pompe à carburant à haute pression (10) pour un système d'injection de carburant d'un moteur à combustion interne. La pompe à carburant à haute pression comprend un carter (12) de pompe, lequel comporte une zone frontale (44) côté entraînement, une sortie haute pression (24) et une soupape de limitation de pression (58), laquelle évacue, dans un état ouvert, du carburant provenant de la sortie haute pression (24). L'invention propose que la soupape de limitation de pression (58) soit disposée dans le carter (12) de pompe sur un trajet d'écoulement d'évacuation (52), qui débouche dans la zone frontale (44) côté entraînement du carter (12) de pompe.
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 true EP3894687A1 (fr) 2021-10-20
EP3894687B1 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 (5)

Country Link
EP (1) EP3894687B1 (fr)
KR (1) KR20210099585A (fr)
CN (1) CN113167202A (fr)
DE (1) DE102018221702A1 (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 (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
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
CN113167202A (zh) 2021-07-23
KR20210099585A (ko) 2021-08-12
DE102018221702A1 (de) 2020-06-18
EP3894687B1 (fr) 2024-01-10
WO2020120075A1 (fr) 2020-06-18

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