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EP1378657B1 - Injecteur de carburant - Google Patents

Injecteur de carburant Download PDF

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Publication number
EP1378657B1
EP1378657B1 EP20030012487 EP03012487A EP1378657B1 EP 1378657 B1 EP1378657 B1 EP 1378657B1 EP 20030012487 EP20030012487 EP 20030012487 EP 03012487 A EP03012487 A EP 03012487A EP 1378657 B1 EP1378657 B1 EP 1378657B1
Authority
EP
European Patent Office
Prior art keywords
fuel injection
injection valve
coupler
valve according
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.)
Expired - Lifetime
Application number
EP20030012487
Other languages
German (de)
English (en)
Other versions
EP1378657A3 (fr
EP1378657A2 (fr
Inventor
Michael Huebel
Rene Deponte
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 EP1378657A2 publication Critical patent/EP1378657A2/fr
Publication of EP1378657A3 publication Critical patent/EP1378657A3/fr
Application granted granted Critical
Publication of EP1378657B1 publication Critical patent/EP1378657B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F02M61/04—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
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/0603—Injectors peculiar thereto with means directly operating the valve needle using piezoelectric or magnetostrictive 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
    • 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
    • F02M61/167—Means for compensating clearance or thermal expansion
    • 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
    • F02M2200/70—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger
    • F02M2200/703—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger hydraulic

Definitions

  • the invention relates to a fuel injection valve according to the preamble of the main claim.
  • a hydraulic displacement transformer for a piezoelectric actuator in which a master piston and a slave piston are arranged in a common axis of symmetry and the hydraulic chamber is arranged between the two pistons.
  • a spring is arranged, which presses apart the master cylinder and the slave piston, wherein the master piston in the direction of the actuator and the slave piston are biased in a working direction to a valve needle.
  • this stroke movement is transmitted to the slave piston by the pressure of a hydraulic fluid in the hydraulic chamber, since the hydraulic fluid in the hydraulic chamber can not be compressed and only a small portion of the hydraulic fluid through annular gaps between the master piston and a guide bore and slave piston and a guide bore during the short period of a stroke can escape.
  • the path transformer automatically adjusts to length expansions and pressure-related expansions of a fuel injection valve.
  • a further disadvantage is that it can lead to cavitation of the fuel when the spring exerts a high clamping force on the master cylinder and the slave cylinder and the movement of the actuator takes place very quickly in its starting position.
  • the negative pressure forming in the hydraulic chamber can then lead to cavitation and the resulting damage to components.
  • the fuel injection valve according to the invention with the characterizing features of claim 1 has the advantage that the hydraulic coupler is sealed by a membrane, a corrugated tube seal, and an elastomeric membrane so that a coupler volume and a compensating volume are formed, which is filled with a high-viscosity hydraulic medium are.
  • the membrane sealing the actuator housing leads to the fact that the actuator housing is not subjected to high fuel pressures and thus remains free of forces.
  • the membrane is U-shaped and communicates with a flange and the master piston in connection.
  • the compensating volume may have two separate regions, which are separated by a further membrane.
  • a compensation hole for receiving coupler medium for example, between the diaphragm space and filled with hydraulic medium area of the compensation volume or between the fuel-filled area of the compensation volume and the fuel channel.
  • FIG. 1 a fuel injection valve 1 according to the prior art in its essential components for a better understanding of the invention briefly explained.
  • the fuel injection valve 1 is suitable as a fuel injection valve 1 for fuel injection systems for mixture-compressing, spark-ignited internal combustion engines for direct injection of fuel into the combustion chamber of the internal combustion engine.
  • the fuel injection valve 1 in this case comprises a particular piezoelectric or magnetostrictive actuator 2, which is encapsulated in an actuator housing 3.
  • the actuator 2 is excited via an electrical connection 4, which is contacted by an electrical line 5.
  • the actuator 2 is supported on the downstream side of an actuating element 6, which is biased by a spring 7, which is supported on a housing shoulder 8, against the actuator 2.
  • the actuator housing 3 is provided with a suitable, in Fig. 1 seal not shown sealed against the fuel injector 1 flowing through the fuel. By sealing the actuator housing 3, the actuator 2 is protected against both mechanical and chemical influences.
  • the hydraulic coupler 10 Downstream of the actuating element 6, a hydraulic coupler 10 is arranged.
  • the hydraulic coupler 10 includes a master piston 11 and a slave piston 12 which are spaced from each other by a coupler gap 13.
  • the master piston 11 and the slave piston 12 are arranged in a guide sleeve 14.
  • the master piston 11 and the slave piston 12 may have the same or different cross-sectional areas to implement the stroke of the actuator 2 or translate in a ratio of up to 1: 3.
  • a further actuating body 15 is arranged, which cooperates with a valve needle 16.
  • the fuel injection valve 1 is formed in the present case as an outwardly opening fuel injection valve 1, wherein a valve closing body 17 cooperates with a valve seat surface 18, which is formed on a nozzle body 19, to a sealing seat.
  • the valve closing body 17 is formed at the downstream end of the valve needle 16.
  • a return spring 20, which is arranged in the nozzle body 19, ensures, when the actuator 2 is not actuated, that the fuel injection valve 1 is kept closed. After the actuation phase of the actuator 2, the return spring 20 continues to ensure that the valve closing body 17 is again used on the valve seat surface 18 and the fuel injection valve 1 is thereby closed.
  • the fuel is supplied via a central fuel supply 21 at an inlet end 22 of the fuel injection valve 1 and guided via fuel channels 23 to the hydraulic coupler 10 and to the sealing seat.
  • the fuel also serves as a coupling medium.
  • the actuator 2 is not subjected to high system pressure, whereby the sealing of the actuator 2 against the coupler medium, the provision of the master piston 11 when closing the fuel injector 1 and the provision of a compensation volume for displaced coupler medium by sufficient elasticity of the sealing corrugated pipe 9 is possible.
  • the hydraulic coupler 10 is formed as a whole unit and sealed by various sealing measures against the fuel.
  • the hydraulic coupler 10 is disposed through a thin-walled elastomeric membrane 30 defining a balance volume 31 between the elastomeric membrane 30 and a flange 32.
  • the compensating volume 31 communicates via a leakage gap 33 with a coupler volume 34 in the coupler gap 13 in connection.
  • the coupler medium is arranged through a steel diaphragm 35 which is arranged between the master piston 11 and the flange 32 and with the respective component preferably welded, sealed.
  • a corrugated tube 36 seals the coupler medium against the fuel pressure of up to 20 MPa and simultaneously serves as a return spring for the slave piston 12 during the closing phase of the fuel injection valve 1.
  • the corrugated tube 36 is welded to the slave piston 12 and a support member 37, which at the same time Guide for the slave piston 12 is used.
  • the elastomeric membrane 30 is sealed by a clamping sleeve 44 against the fuel.
  • the fuel is passed over fuel channels 23 on the hydraulic coupler 10 in the direction of sealing seat.
  • the actuator 2 Upon actuation of the actuator 2, this expands in the outflow direction and acts via the actuating element 6 on the master piston 11 of the hydraulic coupler 10 a.
  • the hydraulic medium transmits the rapid movement of the actuator 2 via the coupler gap 13 to the slave piston 12 and from there to the valve needle 16, whereby the valve closing body 17 lifts off from the valve seat surface 18 and fuel is injected into the combustion chamber of the internal combustion engine. Due to the speed of movement of the actuator 2, the hydraulic medium behaves similar to a solid. During slow movements of the actuator 2, for example due to thermal influences, the hydraulic medium is displaced by the leakage gap 33 in the compensating volume 31, whereby an arbitrary opening of the fuel injection valve 1 is prevented.
  • Fig. 2B shows further possibilities for the design of the fuel injection valve 1 according to the invention.
  • the compensating volume 31 is provided with a corrugated elastomeric diaphragm 39, which divides the compensating volume 31 into a first region 40, in which the coupler medium is located, and a second region 41, in which fuel pressure is applied.
  • a compensation bore 43 is formed between the first region 40 of the compensation volume 31 filled with coupler medium and a membrane space 42, which is formed between the flange 32, the diaphragm 35 and the master piston 11 of the hydraulic coupler 10 the now no longer existing leakage gap 33 takes over.
  • Advantage of this embodiment is the ability to produce the flange 32 in one piece with the support member 37, for example by turning cost.
  • the invention is not limited to the illustrated embodiments and also for any other construction of fuel injection valves 1, in particular interior-opening fuel injection valves suitable.

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 (12)

  1. Soupape d'injection de carburant (1), en particulier soupape d'injection de carburant (1) pour installations d'injection de carburant de moteurs à combustion interne, comprenant un actionneur piézoélectrique ou magnétostrictif (2), qui, par le biais d'un coupleur hydraulique (10), actionne un corps de fermeture de soupape (17), qui coopère avec une surface de siège de soupape (18) pour former un ajustement étanche, le coupleur hydraulique (10) présentant un maître-piston (11) et un piston récepteur (12), qui sont espacés l'un de l'autre par une fente de coupleur (13),
    le coupleur hydraulique (10) fermant avec une membrane (35) qui est connectée au maître-piston (11), et avec un joint d'étanchéité (36), qui est connecté au piston récepteur (12), un volume de coupleur (34) et un volume de compensation (31), qui sont remplis d'un fluide de coupleur, la membrane (35) étant en liaison avec une bride (32),
    caractérisée en ce que
    la bride (32) et un composant de support (37) sont disposés dans une membrane élastomère (30) et sont connectés à celle-ci.
  2. Soupape d'injection de carburant selon la revendication 1,
    caractérisée en ce que
    la membrane (35) est réalisée en forme de U.
  3. Soupape d'injection de carburant selon la revendication 1 ou 2,
    caractérisée en ce
    qu'un espace de membrane (42) est réalisé entre la bride (32), la membrane (35) et le maître-piston (11).
  4. Soupape d'injection de carburant selon la revendication 3,
    caractérisée en ce que
    l'espace de membrane (42) est en liaison par le biais d'une fente de fuite (45) réalisée entre la bride (32) et le maître-piston, avec le volume de coupleur (34) de la fente de coupleur (13).
  5. Soupape d'injection de carburant selon l'une quelconque des revendications 1 à 4,
    caractérisée en ce que
    la membrane élastomère (30) est étanchée au moyen d'une bague d'étanchéité (38) contre un composant de boîtier (45).
  6. Soupape d'injection de carburant selon l'une quelconque des revendications 1 à 5,
    caractérisée en ce que
    le volume de compensation (31) est en liaison avec le volume de coupleur (34) par le biais d'une fente de fuite (33) entre la bride (32) et le composant de support (37).
  7. Soupape d'injection de carburant selon l'une quelconque des revendications 1 à 6,
    caractérisée en ce que
    le volume de compensation (31) présente une première région (40) et une deuxième région (41).
  8. Soupape d'injection de carburant selon la revendication 7,
    caractérisée en ce que
    les régions (40 ; 41) sont séparées l'une de l'autre par une membrane élastomère (39) en forme de tube ondulé.
  9. Soupape d'injection de carburant selon la revendication 7 ou 8,
    caractérisée en ce que
    la première région (40) est remplie de fluide hydraulique.
  10. Soupape d'injection de carburant selon l'une quelconque des revendications 7 à 9,
    caractérisée en ce que
    la deuxième région (41) est remplie de carburant.
  11. Soupape d'injection de carburant selon l'une quelconque des revendications 7 à 10,
    caractérisée en ce
    qu'un espace de membrane (42) de la membrane (35) est en liaison avec la première région (40) au moyen d'un alésage de compensation (43).
  12. Soupape d'injection de carburant selon l'une quelconque des revendications 1 à 11,
    caractérisée en ce que
    le fluide de coupleur est hautement visqueux.
EP20030012487 2002-07-04 2003-06-02 Injecteur de carburant Expired - Lifetime EP1378657B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2002130089 DE10230089A1 (de) 2002-07-04 2002-07-04 Brennstoffeinspritzventil
DE10230089 2002-07-04

Publications (3)

Publication Number Publication Date
EP1378657A2 EP1378657A2 (fr) 2004-01-07
EP1378657A3 EP1378657A3 (fr) 2008-03-05
EP1378657B1 true EP1378657B1 (fr) 2010-08-11

Family

ID=29719463

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20030012487 Expired - Lifetime EP1378657B1 (fr) 2002-07-04 2003-06-02 Injecteur de carburant

Country Status (2)

Country Link
EP (1) EP1378657B1 (fr)
DE (2) DE10230089A1 (fr)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10307816A1 (de) * 2003-02-24 2004-09-02 Robert Bosch Gmbh Brennstoffeinspritzventil
DE10360450A1 (de) * 2003-02-27 2004-09-09 Robert Bosch Gmbh Brennstoffeinspritzventil
EP1452727B1 (fr) * 2003-02-27 2007-01-24 Robert Bosch Gmbh Injecteur de carburant
US7500648B2 (en) 2003-02-27 2009-03-10 Robert Bosch Gmbh Fuel-injection valve
JP2007515604A (ja) * 2003-12-05 2007-06-14 シーメンス　アクチエンゲゼルシヤフト 装置、該装置を製作するための方法、チャンバ装置および伝達装置
DE102004031790A1 (de) 2004-07-01 2006-01-26 Robert Bosch Gmbh Common-Rail-Injektor
DE102005041667B4 (de) * 2005-09-02 2016-05-12 Robert Bosch Gmbh Injektor mit direkter Nadelsteuerung
DE102005041668B4 (de) * 2005-09-02 2016-03-31 Robert Bosch Gmbh Injektor mit direkter Nadelsteuerung
DE102008054652B4 (de) * 2008-12-15 2018-01-04 Robert Bosch Gmbh Hydraulischer Koppler
DE102017208269A1 (de) * 2017-05-17 2018-11-22 Robert Bosch Gmbh Förderaggregat für eine Brennstoffzellenanordnung zum Fördern und Steuern von einem gasförmigen Medium

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0656162B2 (ja) * 1987-03-03 1994-07-27 トヨタ自動車株式会社 ストロ−ク可変装置
DE4005455A1 (de) * 1989-02-28 1990-08-30 Volkswagen Ag Zumessventil, insbesondere kraftstoff-einspritzventil fuer eine brennkraftmaschine
DE59010904D1 (de) 1990-09-25 2000-05-31 Siemens Ag Anordnung für einen in Hubrichtung wirkenden adaptiven, mechanischen Toleranzausgleich für den Wegtransformator eines piezoelektrischen Aktors
JPH0587189A (ja) * 1991-09-26 1993-04-06 Nissan Motor Co Ltd 振動吸収装置
DE19500706C2 (de) 1995-01-12 2003-09-25 Bosch Gmbh Robert Zumeßventil zur Dosierung von Flüssigkeiten oder Gasen
DE19646847A1 (de) * 1996-11-13 1997-06-12 Heinz Schmidt Anordnung eines modularen hydraulischen Stellwegtransformators mit variierbarem Übersetzungsverhältnis zur Übersetzung von Stellwagen von Festkörperenergiewandlern oder dergleichen
DE19813983A1 (de) * 1998-03-28 1999-09-30 Bosch Gmbh Robert Ventil zum Steuern von Flüssigkeiten
DE19950760A1 (de) * 1999-10-21 2001-04-26 Bosch Gmbh Robert Brennstoffeinspritzventil
DE10046323B4 (de) * 2000-09-19 2004-02-12 Siemens Ag Hydraulisches Spielausgleichssystem

Also Published As

Publication number Publication date
DE10230089A1 (de) 2004-01-15
EP1378657A3 (fr) 2008-03-05
DE50312965D1 (de) 2010-09-23
EP1378657A2 (fr) 2004-01-07

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