EP2798194B1 - Injecteur de carburant pour moteurs à combustion interne - Google Patents

Injecteur de carburant pour moteurs à combustion interne Download PDF

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Publication number
EP2798194B1
EP2798194B1 EP12812984.8A EP12812984A EP2798194B1 EP 2798194 B1 EP2798194 B1 EP 2798194B1 EP 12812984 A EP12812984 A EP 12812984A EP 2798194 B1 EP2798194 B1 EP 2798194B1
Authority
EP
European Patent Office
Prior art keywords
fuel
pressure
fuel injection
injection valve
receptacle
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.)
Not-in-force
Application number
EP12812984.8A
Other languages
German (de)
English (en)
Other versions
EP2798194A1 (fr
Inventor
Björn SCHOLEMANN
Helmut Clauss
Lorenz Zerle
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 EP2798194A1 publication Critical patent/EP2798194A1/fr
Application granted granted Critical
Publication of EP2798194B1 publication Critical patent/EP2798194B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/165—Filtering elements specially adapted in fuel inlets to injector
    • 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
    • F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
    • F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
    • F02M47/027—Electrically actuated valves draining the chamber to release the closing pressure
    • 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
    • F02M55/004—Joints; Sealings
    • F02M55/005—Joints; Sealings for high pressure conduits, e.g. connected to pump outlet or to injector inlet
    • 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
    • F02M55/008—Arrangement of fuel passages inside of injectors
    • 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
    • F02M2200/16—Sealing of fuel injection apparatus not otherwise provided for
    • 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
    • F02M2200/27—Fuel-injection apparatus with filters
    • 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
    • F02M2200/28—Details of throttles in fuel-injection apparatus

Definitions

  • the invention relates to a fuel injection valve, as it is preferably used for the injection of fuel under high pressure in a combustion chamber of an internal combustion engine.
  • fuel injection valves For introducing fuel directly into a combustion chamber of an internal combustion engine, fuel injection valves are known which can spray compressed fuel finely atomized and which are used in particular in self-igniting internal combustion engines.
  • the fuel injection valve in this case comprises a housing in which a nozzle needle is arranged longitudinally displaceable and opens or closes one or more injection openings by their longitudinal movement.
  • a control chamber is provided which can be filled with fuel under high pressure and which exerts a hydraulic closing force on the nozzle needle.
  • the pressure in the control chamber is usually controlled by an electromagnetic control valve, which connects the control chamber when needed with a low-pressure chamber in the fuel injection valve.
  • the fuel for the injection is in such an injector, as for example from the DE 102 07 227 A1 is known, compressed by a separate high pressure pump and stored in a high-pressure accumulator, the so-called rail. From there, a high-pressure line leads to the high-pressure connection of the fuel injection valve, which introduces the compressed fuel into the combustion chamber. In the housing of the fuel injection valve to a high pressure passage is formed, through which the fuel flows to the injection openings. To supply the control chamber branches off from this high-pressure channel from a control line. The fuel from the control room flows off via an outlet throttle, which is from the Control valve is opened and closed and has only a very small flow cross-section.
  • a fuel injector in which the high-pressure port is screwed into the injector body with the interposition of a sealing disc having a passage for the fuel.
  • the fuel injection valve according to the invention has the advantage that the functionality of the fuel injection valve is ensured despite contamination of the fuel with particles over its entire lifetime.
  • the fuel injection valve has a housing with a high-pressure connection, which comprises a connection body, which is inserted into a receptacle on the housing.
  • a channel is formed, can flow through the fuel in a housing formed in the high pressure passage, which opens into the receptacle and there forms an inlet opening, wherein between the connection body and the receptacle, a sealing disc is arranged.
  • the sealing disc has an opening through which the fuel in the high-pressure passage and in the control line, which supplies the control valve with fuel, can flow, wherein the opening of the sealing disc with the inlet opening of the high pressure line is at least approximately aligned. Particles that are in the fuel and pass through the high-pressure port into the fuel injection valve, flow due to their inertia in the high pressure passage and thus in the direction of the injection ports, while in the control line virtually no particles penetrate. The function of the control valve is thus ensured over the life of the fuel injection valve.
  • a recess is formed at the bottom of the receptacle into which the high-pressure channel and the control line open. Such a depression allows appropriate arrangement of high pressure passage and control line to achieve the desired fuel flow without great effort.
  • a fuel filter is arranged in the connection body.
  • the best possible quality of the fuel with respect to filterable particles is achieved by the arranged directly in front of the fuel injection valve fuel filter, since there are only very few impurities after the filter in the fuel.
  • the fuel injection valve comprises a housing 1, which comprises a holding body 2 and a nozzle body 3, which are braced against each other in a liquid-tight manner by a tensioning device not shown in the drawing.
  • a pressure chamber 18 is formed, in which a nozzle needle 20 is arranged longitudinally displaceable.
  • the nozzle needle 20 acts with its combustion chamber side End together with a valve seat 22 and thereby closes or opens a flow cross-section between the pressure chamber 18 and an adjacent to the valve seat 22 blind hole 23, from which several injection ports 24 go out.
  • a control valve 5 which comprises a magnet armature 6 which is movable by an electromagnet, not shown, in the longitudinal direction of the fuel injection valve and cooperates with a control valve seat 40 which is formed on a valve piece 25.
  • the valve member 25 is a substantially rotationally symmetrical component, which is formed as a hollow cylinder at its nozzle end and a valve member 25 longitudinally movable valve piston 21 receives, which is connected directly or indirectly with the nozzle needle 20.
  • the valve piece is surrounded by an annular space 31, which is supplied via a control line 29 with fuel under high pressure.
  • the annular space 31 is connected via a formed in the valve piece 25 inlet throttle 27 with the control chamber 26 so that fuel can flow under high pressure in the control room.
  • the control chamber 26 is also connected via an outlet throttle 28 with a low-pressure chamber 19 in which there is always a very low fuel pressure, which is not significantly above the atmospheric pressure in the rule.
  • the outlet throttle 28 can be closed via the control valve 5, so that the pressure in the control chamber 26 can be controlled by the control valve 5: If the control valve 5 is opened, fuel flows from the control chamber 26 into the low pressure chamber 19, which reduces the pressure in the control chamber 26 decreases.
  • the fuel injection valve is supplied with compressed fuel via a high-pressure connection 7, which is formed on the housing 1.
  • the high-pressure connection 7 comprises a housing 30 formed in the receptacle 30, which is designed as a cylindrical recess in the holding body 2 and has an internal thread.
  • a sealing surface 36 is arranged, which serves as an abutment for a connecting body 15, which has substantially the shape of a hollow cylinder and is inserted into the receptacle 30.
  • the connection body 15 has an external thread, which engages in the internal thread formed in the receptacle 30, so that the connection body 15 is clamped by screwing against the sealing surface 36.
  • a sealing disk 32 is disposed between the connecting body 15 and the sealing surface 36, which has a central opening 33.
  • a passage 34 is formed for the passage of the fuel, which passes through the entire connection body 15 and through which the fuel flows into the fuel injection valve, wherein in the channel 34, a fuel filter 35 may be arranged to filter the particles located in the fuel as far as possible. However, it must be ensured that there is no significant pressure drop on the fuel filter, which limits the achievable filter effect.
  • the fuel is introduced via a high pressure line 13 from a high pressure accumulator 12 in the channel 34, wherein a plurality of fuel injection valves may be connected to the same high-pressure accumulator 12.
  • the high-pressure accumulator 12 serves as a buffer and pressure reservoir for the compressed fuel which is taken from a tank 9 and is compressed by a high-pressure pump 11.
  • a recess 37 is formed, which is designed here conical.
  • This recess 37 opens on the one hand, the control line 29 and on the other hand, a high pressure passage 16, which forms an inlet opening 116 at the intersection with the recess 37.
  • the high-pressure passage 16 connects the recess 37 and thus the receptacle 30 with the high-pressure chamber 18 of the nozzle body 3.
  • the opening 33 of the sealing washer 32 to the inlet opening 116 is arranged so that the opening 33 is at least approximately aligned with the inlet opening 116.
  • the diameter of the opening 33 corresponds at least substantially to the diameter of the inlet opening 116 of the high-pressure passage 16.
  • the control line 29 leads offset to the inlet opening 116 in the recess 37, which in FIG. 2 , an enlargement of the designated II section of the FIG. 1 is shown again.
  • the fuel exiting the port 33 during injection of the fuel flows primarily into the high-pressure passage 16. Since the control valve 5 is opened during injection, fuel also flows from the port 33 via the recess 37 into the control line 29 and from there into the annular space 31 and the control chamber 26.
  • the fuel exiting from the opening 33 must make a strong change in direction and bend in the embodiment shown more than 90 ° from its original flow direction to flow into the control line 29.
  • the particles 42 still present in the fuel can not take part in this change in direction and are entrained by the fuel flowing into the high-pressure passage 16 and so do not predominantly enter the control line 29, as shown in FIG. 2 shows.
  • the particles 42, which are washed up into the pressure chamber 18, are flushed out via the injection openings 24 and practically do not obstruct the function of the fuel injection valve. Larger particles, which could also lead to damage in the nozzle body 2, are retained by the fuel filter 35 and thus do not reach the fuel injection valve.

Landscapes

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

Claims (4)

  1. Soupape d'injection de carburant pour moteurs à combustion interne pour l'injection de carburant à haute pression à haute pression comprenant un boîtier (1) qui présente un raccord haute pression (7) qui comprend un corps de raccordement (15) qui est introduit dans un logement (30) au niveau du boîtier (1), et comprenant un canal (34) qui est réalisé dans le corps de raccordement (15) et à travers lequel du carburant peut s'écouler dans un canal haute pression (16) réalisé dans le boîtier, canal haute pression qui débouche dans le logement (30) et y forme une ouverture d'entrée (116), une rondelle d'étanchéité (32) étant disposée entre le corps de raccordement (15) et le logement (30), et comprenant une soupape de commande (5) disposée dans le boîtier (1) pour commander la pression dans un espace de commande (26), l'espace de commande (26) étant connecté au logement (30) par le biais d'une conduite de commande (29) réalisée dans le boîtier (1), la rondelle d'étanchéité (32) présentant une ouverture (33) à travers laquelle le carburant peut s'écouler dans le canal haute pression (16) et la conduite de commande (29), l'ouverture (33) de la rondelle d'étanchéité (32) étant au moins en partie en affleurement avec l'ouverture d'entrée (116) du canal haute pression (16),
    caractérisée en ce
    qu'un renfoncement (37) est réalisé à la base du logement (30), dans lequel débouchent le canal haute pression (16) et la conduite de commande (29).
  2. Soupape d'injection de carburant selon la revendication 1, caractérisée en ce que le carburant qui pénètre à travers la rondelle d'étanchéité (32) dans la conduite de commande (29), subit une variation de direction de plus de 90°.
  3. Soupape d'injection de carburant selon la revendication 1, caractérisée en ce que le corps de raccordement (15) comprend un filtre à carburant (35) qui est disposé dans le canal (34) et qui est traversé par le carburant qui s'écoule à travers le canal (34).
  4. Soupape d'injection de carburant selon la revendication 1, caractérisée en ce que l'ouverture (33) de la rondelle d'étanchéité (32) présente un diamètre qui correspond au moins approximativement au diamètre du canal haute pression (16).
EP12812984.8A 2011-12-27 2012-12-21 Injecteur de carburant pour moteurs à combustion interne Not-in-force EP2798194B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE201110089925 DE102011089925A1 (de) 2011-12-27 2011-12-27 Kraftstoffeinspritzventil für Brennkraftmaschinen
PCT/EP2012/076597 WO2013098231A1 (fr) 2011-12-27 2012-12-21 Injecteur de carburant pour moteurs à combustion interne

Publications (2)

Publication Number Publication Date
EP2798194A1 EP2798194A1 (fr) 2014-11-05
EP2798194B1 true EP2798194B1 (fr) 2016-08-10

Family

ID=47522574

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12812984.8A Not-in-force EP2798194B1 (fr) 2011-12-27 2012-12-21 Injecteur de carburant pour moteurs à combustion interne

Country Status (4)

Country Link
EP (1) EP2798194B1 (fr)
CN (1) CN104081039B (fr)
DE (1) DE102011089925A1 (fr)
WO (1) WO2013098231A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6245681B2 (ja) * 2013-06-03 2017-12-13 ボッシュ株式会社 燃料噴射弁
EP2940287A1 (fr) * 2014-05-01 2015-11-04 Delphi International Operations Luxembourg S.à r.l. Filtre d'injecteur de carburant
EP2940286A1 (fr) * 2014-05-01 2015-11-04 Delphi International Operations Luxembourg S.à r.l. Filtre d'injecteur de carburant
JP2020002784A (ja) * 2018-06-25 2020-01-09 ロベルト・ボッシュ・ゲゼルシャフト・ミト・ベシュレンクテル・ハフツングＲｏｂｅｒｔ Ｂｏｓｃｈ Ｇｍｂｈ 燃料噴射装置及び燃料噴射弁
US20220136473A1 (en) * 2020-10-30 2022-05-05 Caterpillar Inc. Filtration device for a common rail fuel injector

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2730172B2 (ja) * 1989-05-09 1998-03-25 株式会社デンソー 燃料噴射装置
IT1276503B1 (it) * 1995-07-14 1997-10-31 Elasis Sistema Ricerca Fiat Perfezionamenti ad una valvola di dosaggio a comando elettromagnetico, per un iniettore di combustibile.
DE10059009A1 (de) * 2000-11-28 2002-05-29 Bosch Gmbh Robert Brennstoffeinspritzanlage
DE10207227A1 (de) 2002-02-21 2003-09-04 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen
DE102006034111A1 (de) * 2006-07-24 2008-01-31 Robert Bosch Gmbh Servoventilgesteuerter Injektor zur Einspritzung von Kraftstoff in Zylinderbrennräume von Brennkraftmaschinen; insbesondere Common-Rail-Injektor
DE102006045357A1 (de) * 2006-09-26 2008-04-03 Robert Bosch Gmbh Sicherungsscheibe für ein Magnetventil

Also Published As

Publication number Publication date
DE102011089925A1 (de) 2013-06-27
CN104081039A (zh) 2014-10-01
CN104081039B (zh) 2017-06-09
WO2013098231A1 (fr) 2013-07-04
EP2798194A1 (fr) 2014-11-05

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