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EP2427649B1 - Dispositif pour injecter du carburant - Google Patents

Dispositif pour injecter du carburant Download PDF

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Publication number
EP2427649B1
EP2427649B1 EP10707271.2A EP10707271A EP2427649B1 EP 2427649 B1 EP2427649 B1 EP 2427649B1 EP 10707271 A EP10707271 A EP 10707271A EP 2427649 B1 EP2427649 B1 EP 2427649B1
Authority
EP
European Patent Office
Prior art keywords
actuator
fuel
side part
valve needle
diaphragm
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
EP10707271.2A
Other languages
German (de)
English (en)
Other versions
EP2427649A1 (fr
Inventor
Ralph Engelberg
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 EP2427649A1 publication Critical patent/EP2427649A1/fr
Application granted granted Critical
Publication of EP2427649B1 publication Critical patent/EP2427649B1/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
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
    • 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
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
    • F02M51/0625—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
    • F02M51/0635—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding
    • F02M51/0642—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding the armature having a valve attached thereto
    • F02M51/0653—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding the armature having a valve attached thereto the valve being an elongated body, e.g. a needle valve
    • 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
    • F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
    • F02M61/08—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series the valves opening in direction of fuel flow
    • 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
    • F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
    • F02M61/10—Other injectors with elongated valve bodies, i.e. of needle-valve type
    • 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
    • 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
    • F02M61/161—Means for adjusting injection-valve lift

Definitions

  • the present invention relates to a device for injecting fuel, which can be used in particular in internal combustion engines with direct injection in the stratified charge mode.
  • Devices for injecting fuel for internal combustion engines with direct injection are generally carried out in the prior art as high-pressure injection valves with outwardly opening valve needles, which are actuated by piezo actuators and controlled for the required highly dynamic switching times with complex power amplifiers.
  • High demands on the material quality and manufacturing tolerances of the individual components of these injectors lead to long processing test and production times and the resulting high production costs of these injectors ( WO-A-2005/050001 ).
  • the device according to the invention for injecting fuel with the features of claim 1 has the advantage that this has both a simpler and thus more cost-effective structure, as well as less critical in terms of the required manufacturing and position tolerances of the individual components.
  • a pressure equalizing piston which is arranged on the injection-side part of the valve needle, while a fuel-filled pressure chamber is separated from the first fuel-filled portion of the actuator chamber.
  • the actuator is arranged here in the second fuel-free region of the actuator chamber, a cost-effective electromagnetic actuator can be used, which can achieve the desired highly dynamic switching times. Furthermore, the advantageous use of special soft magnetic materials in the actuator is possible because the actuator components are not exposed to any corrosive effect of the fuel.
  • the pressure compensation piston is slidably disposed with little play in a cylindrical bore of a valve body and provided with a sealing gap.
  • the device according to the invention preferably has a fuel return line from the first region of the actuator chamber to a fuel reservoir.
  • substantially the ambient pressure present in the fuel reservoir is present, which also acts on the side of the diaphragm facing this region.
  • an armature is arranged on the actuator-side part of the valve needle.
  • the actuator comprises a Freiwegfeder whose spring force is designed so that the actuator-side part of the valve needle is always applied to the diaphragm even when not actuated actuator.
  • the return element is designed so that the injection-side part of the valve needle, even when not actuated actuator, d. H. closed valve needle, always applied to the membrane.
  • a lifting of the pressure compensation piston on the membrane and a shock load on the membrane are avoided, which in turn contributes to an increased durability and durability of the membrane.
  • the actuator-side and the injection-side part are always in contact with the membrane in each operating state of the injection device.
  • the injection-side part of the valve needle is formed in two parts with a needle and the pressure compensation piston.
  • a membrane-facing end of the pressure-compensating piston and a membrane facing the end of the actuator-side part of the valve needle are each formed rounded.
  • a homogeneous edition of these ends, in particular in a shifted, d. H. bagged state of the membrane ensured and damage the membrane, z. B. by sharp edges of non-rounded end portions of the pressure compensating piston and the actuator-side part of the valve needle avoided.
  • FIG. 1 a device for injecting fuel according to a preferred embodiment of the invention described in detail.
  • the device 1 for injecting fuel comprises a valve body 2 and an outwardly opening valve needle 3, which is formed from an injection-side part 3a and an actuator-side part 3b.
  • the injection-side part 3a of the valve needle 3 comprises a needle 31 and a pressure compensation piston 10, which are arranged in a pressure chamber 4, the fuel is supplied via a supply line 19 under pressure.
  • the pressure compensation piston 10 is slidably disposed in a cylindrical bore 16 of the valve body 2 with little play.
  • a return element 20 is further arranged, which is supported between the valve body 2 and the needle 31 and the valve needle 3 returns to an initial position after actuation.
  • an electromagnetic actuator 6 is arranged, which comprises a coil 8 and an armature 7, preferably of the type of a flat armature shown here, which is attached to the actuator-side part 3b of the valve needle 3.
  • a diaphragm 13 is further arranged, which is attached to the valve body 2 and on the one hand, the valve needle 3 divided into the injection-side part 3a and the actuator-side part 3b, and on the other hand, the actuator chamber 9 in a first fuel-filled region 5 and a second fuel-free region 18th divided fluid-tight.
  • the first region 5 of the actuator chamber 9 is at least partially filled with fuel which enters the first fuel-filled region 5 via a sealing gap 17 formed on the surface of the pressure-compensating piston 10 as a result of the higher pressure from the pressure chamber 4.
  • an end 10a of the pressure-compensating piston 10 facing the diaphragm 13 and an end 15 of the actuator-side part 3b of the valve needle 3 facing the diaphragm 13 are in each case rounded.
  • damage to the membrane 13 is prevented, which would be caused by possibly formed paragraphs or edges on the end regions of these components during the displacement or buckling of the membrane 13 during actuation of the device 1.
  • a fuel return line 14 branches off from the first fuel-filled region 5 of the actuator chamber 9.
  • a fuel reservoir not shown here, which accumulates through the sealing gap 17 of the pressure compensating piston 10 due to the pressure reduction from the pressure chamber 4 to the first region 5.
  • the fuel return from the first fuel-filled region 5 of the actuator chamber 9 takes place without pressure in the fuel reservoir.
  • the second fuel-free region 18 of the actuator chamber 9 essentially the same pressure is applied to both sides of the membrane 13. Thus, there is a pressure equilibrium on the membrane 13.
  • a free-return spring 12 is further arranged between the armature 7 and a closing element 21 and supports the actuator-side part 3b of the valve spring 3 with the armature 7 fixed thereto at a closing element 21.
  • An electrical connecting line 22 for the actuator 6 is guided through the closing element 21 through to the outside.
  • the freewheeling spring 12 is designed so that the actuator-side part 3b of the valve spring 3 rests against the diaphragm 13 even when the actuator 6 is not actuated.
  • the geometry is designed so that the injection-side part 3a of the valve needle 3 rests against the diaphragm 13 even when the actuator 6 is not actuated (closed valve needle).

Landscapes

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

Claims (9)

  1. Dispositif pour l'injection de carburant, comprenant :
    - un corps de soupape (2) ;
    - une aiguille de soupape (3) s'ouvrant vers l'extérieur disposée dans le corps de soupape (2), dans une chambre de pression (4) remplie de carburant alimentée en carburant sous pression ;
    - un élément de rappel (20) rappelant l'aiguille de soupape (3) dans une position de départ ;
    - un actionneur électromagnétique (6) disposé dans une chambre d'actionneur (9) pour actionner l'aiguille de soupape (3) ; et
    - une membrane (13) disposée dans la chambre d'actionneur (9) et subdivisant la chambre d'actionneur (9) de façon étanche sur le plan fluide en une première région remplie de carburant (5) et en une deuxième région exempte de carburant (18) et subdivisant l'aiguille de soupape (3) en une partie (3a) de côté d'injection et en une partie (3b) de côté d'actionneur ;
    - la membrane (13) n'étant fixée qu'au corps de soupape (2) et la partie (3a) située du côté d'injection et la partie (3b) située du côté d'actionneur de l'aiguille de soupape (3) étant réalisées avec les extrémités (10a, 15) respectivement opposées à la membrane (13), sur le côté opposé ;
    - la partie (3a) située du côté d'injection de l'aiguille de soupape (3) comprenant un piston d'équilibrage de pression (10) séparant la chambre de pression (4) de la première région remplie de carburant (5) de la chambre d'actionneur (9) et l'actionneur (6) étant disposé dans la deuxième région exempte de carburant (18).
  2. Dispositif pour l'injection de carburant selon la revendication 1, caractérisé en ce que le piston d'équilibrage de pression (10) est disposé avec un jeu réduit dans un alésage cylindrique (16) du corps de soupape (2) et comporte un interstice étanche (17) permettant de relâcher la pression de la chambre de pression (4) vers la première région (5) de la chambre d'actionneur (9).
  3. Dispositif pour l'injection de carburant selon la revendication 1 ou 2, caractérisé en ce qu'une conduite de reflux de carburant (14) bifurque de la première région (5) de la chambre d'actionneur (9) vers un réservoir de carburant.
  4. Dispositif pour l'injection de carburant selon l'une quelconque des revendications précédentes, caractérisé en ce que la même pression ou pour l'essentiel la même pression règne des deux côtés de la membrane (13) dans la première région remplie de carburant (5) et dans la deuxième région exempte de carburant (18).
  5. Dispositif pour l'injection de carburant selon l'une quelconque des revendications précédentes, caractérisé en ce qu'une ancre (7) est disposée au niveau de la partie (3b) située du côté d'actionneur de l'aiguille de soupape (3).
  6. Dispositif pour l'injection de carburant selon l'une quelconque des revendications précédentes, caractérisé en ce que l'actionneur (6) comprend en outre un ressort de course libre (12) conçu de telle sorte que la partie (3b) située du côté d'actionneur de l'aiguille de soupape (3) repose contre la membrane (13), et ce également lorsque l'actionneur (6) n'est pas actionné.
  7. Dispositif pour l'injection de carburant selon l'une quelconque des revendications précédentes, caractérisé en ce que l'élément de rappel (20) est conçu de telle sorte que la partie (3a) située du côté d'injection de l'aiguille de soupape (3) repose contre la membrane (13), et ce également lorsque l'actionneur (6) n'est pas actionné.
  8. Dispositif pour l'injection de carburant selon l'une quelconque des revendications précédentes, caractérisé en ce que la partie (3a) située du côté d'injection de l'aiguille de soupape (3) est formée en deux parties avec une aiguille (31) et le piston d'équilibrage de pression (10).
  9. Dispositif pour l'injection de carburant selon l'une quelconque des revendications précédentes, caractérisé en ce que le piston d'équilibrage de pression (10) comporte une extrémité (10a) arrondie orientée vers la membrane (13) et que la partie (3b) située du côté d'actionneur de l'aiguille de soupape (3) comporte une extrémité (15) arrondie orientée vers la membrane (13).
EP10707271.2A 2009-05-06 2010-03-05 Dispositif pour injecter du carburant Not-in-force EP2427649B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102009002840A DE102009002840A1 (de) 2009-05-06 2009-05-06 Vorrichtung zum Einspritzen von Kraftstoff
PCT/EP2010/052814 WO2010127887A1 (fr) 2009-05-06 2010-03-05 Dispositif pour injecter du carburant

Publications (2)

Publication Number Publication Date
EP2427649A1 EP2427649A1 (fr) 2012-03-14
EP2427649B1 true EP2427649B1 (fr) 2013-07-17

Family

ID=42167596

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10707271.2A Not-in-force EP2427649B1 (fr) 2009-05-06 2010-03-05 Dispositif pour injecter du carburant

Country Status (10)

Country Link
US (1) US8960573B2 (fr)
EP (1) EP2427649B1 (fr)
JP (1) JP5490222B2 (fr)
KR (1) KR101711851B1 (fr)
CN (1) CN102414431B (fr)
BR (1) BRPI1011824A2 (fr)
DE (1) DE102009002840A1 (fr)
ES (1) ES2424089T3 (fr)
RU (1) RU2538146C2 (fr)
WO (1) WO2010127887A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010031643A1 (de) * 2010-07-22 2012-01-26 Robert Bosch Gmbh Kraftstoffeinspritzventil mit trockenem Magnetaktor
RU2540347C2 (ru) * 2013-01-24 2015-02-10 Федеральное государственнное бюджетное образовательное учреждение высшего профессионального образования "Ярославский государственный технический университет" Электроуправляемая форсунка для впрыскивания топлива в двигатель внутреннего сгорания
CN105370468B (zh) * 2015-12-11 2017-09-29 中国北方发动机研究所(天津) 喷油器压力控制阀
DE102018212665A1 (de) * 2018-07-30 2020-01-30 Robert Bosch Gmbh Kolbenpumpe und Kraftstofffördereinrichtung für kryogene Kraftstoffe
DE102024200109A1 (de) 2024-01-05 2025-07-10 Robert Bosch Gesellschaft mit beschränkter Haftung Kraftstoffinjektor für gasförmige oder flüssige Kraftstoffe

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4695034A (en) * 1984-11-27 1987-09-22 Stec Inc. Fluid control device
DE3533085A1 (de) * 1985-09-17 1987-03-26 Bosch Gmbh Robert Zumessventil zur dosierung von fluessigkeiten oder gasen
DE3808671A1 (de) * 1987-03-13 1988-09-22 Orbital Eng Pty Vorrichtung und verfahren zur kraftstoffeinspritzung
US5031841A (en) * 1989-02-28 1991-07-16 Volkswagen Ag Metering valve, particularly fuel injection valve
JPH0486367A (ja) * 1990-07-30 1992-03-18 Aisin Seiki Co Ltd 燃料噴射弁
DE19601019A1 (de) * 1996-01-13 1997-07-17 Bosch Gmbh Robert Einspritzventil, insbesondere zum direkten Einspritzen von Kraftstoff in einen Brennraum eines Verbrennungsmotors
DE10019766A1 (de) * 2000-04-20 2001-10-31 Bosch Gmbh Robert Ventil zum Steuern von Flüssigkeiten
DE10060939A1 (de) 2000-12-07 2002-06-13 Siemens Ag Fluiddosiervorrichtung mit Drosselstelle
DE10204655A1 (de) * 2002-02-05 2003-08-28 Bosch Gmbh Robert Brennstoffeinspritzventil
FR2836536B1 (fr) * 2002-02-26 2004-05-14 Cedrat Technologies Vanne piezoelectrique
EP1497553B1 (fr) * 2002-04-22 2010-01-13 Continental Automotive GmbH Dispositif de dosage pour fluides, notamment soupape d'injection d'automobile
RU2247855C1 (ru) 2003-07-21 2005-03-10 Открытое акционерное общество "Ярославский завод топливной аппаратуры" (ОАО "ЯЗТА") Форсунка для двигателя внутреннего сгорания
US6971172B2 (en) * 2003-08-08 2005-12-06 Cummins Inc. Piezoelectric control valve adjustment method
DE10353641B4 (de) * 2003-11-17 2016-12-01 Robert Bosch Gmbh Brennstoffeinspritzventil

Also Published As

Publication number Publication date
WO2010127887A1 (fr) 2010-11-11
KR101711851B1 (ko) 2017-03-03
DE102009002840A1 (de) 2010-11-11
KR20120014139A (ko) 2012-02-16
RU2011149359A (ru) 2013-06-20
CN102414431B (zh) 2014-05-07
US20120074245A1 (en) 2012-03-29
ES2424089T3 (es) 2013-09-27
RU2538146C2 (ru) 2015-01-10
EP2427649A1 (fr) 2012-03-14
US8960573B2 (en) 2015-02-24
JP2012526226A (ja) 2012-10-25
BRPI1011824A2 (pt) 2016-03-22
CN102414431A (zh) 2012-04-11
JP5490222B2 (ja) 2014-05-14

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