EP1442210B1 - Soupape d'injection de carburant - Google Patents

Soupape d'injection de carburant Download PDF

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Publication number
EP1442210B1
EP1442210B1 EP02767123A EP02767123A EP1442210B1 EP 1442210 B1 EP1442210 B1 EP 1442210B1 EP 02767123 A EP02767123 A EP 02767123A EP 02767123 A EP02767123 A EP 02767123A EP 1442210 B1 EP1442210 B1 EP 1442210B1
Authority
EP
European Patent Office
Prior art keywords
fuel
fuel injection
injection valve
actuator
actuator housing
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
EP02767123A
Other languages
German (de)
English (en)
Other versions
EP1442210A1 (fr
Inventor
Hubert Stier
Elmar Okrent
Ulrich DÖBLER
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 EP1442210A1 publication Critical patent/EP1442210A1/fr
Application granted granted Critical
Publication of EP1442210B1 publication Critical patent/EP1442210B1/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
    • 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

Definitions

  • the invention relates to a fuel injection valve according to the preamble of the main claim, as in the closest prior art DE 19943142 A disclosed.
  • a fuel injection valve which has an axially movable valve needle in a nozzle body, which can be actuated by a piezoelectric actuator and is held by a compression spring in the closed position.
  • the fuel is supplied from an external source with freely adjustable pressure.
  • the valve needle has a central bore.
  • the piezoelectric actuator surrounds the valve needle concentrically and is sealed by sealing surfaces against the fuel pressure.
  • a disadvantage of the DE 195 34 445 C2 known fuel injection valve is in particular that the encapsulation of the piezoelectric actuator, which must be sealed against the aggressive fuel and against the pressure of the fuel, is complicated and expensive. The compensation of thermal changes in length of the actuator and subsequent malfunction of the fuel injection valve is difficult to achieve.
  • the fuel injection valve according to the invention with the features of the independent main claim has the advantage that the piezoelectric or magnetostrictive actuator in an actuator housing and the nozzle body in which the actuator housing is arranged, are jointly lockable by a connection part, which has diameter steps, with the actuator housing and the nozzle body are connectable.
  • the piezoelectric actuator is acted upon by a closing spring which is arranged between an end plate of the actuator and a shoulder of the actuator housing.
  • FIG. 1 illustrated embodiment of a fuel injection valve 1 according to the invention is carried out in the form of a fuel injection valve 1 for fuel injection systems of mixture-compression, spark-ignited internal combustion engines.
  • the fuel injection valve 1 is suitable in particular for the direct injection of fuel into a combustion chamber, not shown, of an internal combustion engine.
  • the fuel injection valve 1 comprises a piezoelectric actuator 2, which is encapsulated in an actuator housing 3.
  • the actuator housing 3 is completed on the inlet side by a connecting part 4, which is for example inexpensive to produce by turning.
  • the connector 4 has a fuel inlet 5 and an electrical connection, not shown, for actuating the piezoelectric actuator 2.
  • the piezoelectric actuator 2 is supported on the downstream side of an end plate 6, on whose other side a closing spring 7 is arranged.
  • the closing spring 7 is supported between the end plate 6 and a shoulder 8 of the actuator housing 3 and acts on a standing with the end plate 6 in non-positive connection valve needle 9 with a closing force which keeps the fuel injector 1 in the de-energized state of the piezoelectric actuator 2 closed.
  • valve needle 9 passes through the closing spring 7 and a recess 10 in the shoulder 8 of the actuator housing 3.
  • a valve closing body 11 is formed which forms a sealing seat with a formed on a nozzle body 12 valve seat surface 13.
  • the actuator housing 3 With the inlet side inserted therein connector part 4th arranged.
  • the nozzle body 12 is also attached to the connection part 4.
  • connection part 4 in this case has a first diameter step 19, on which the actuator housing 3 is plugged, and a second diameter step 20, on which the nozzle body 12 is plugged. Characterized in that the radial diameter of the first diameter stage 19 is smaller than that of the second diameter stage 20, an annular gap 14 is formed between the actuator housing 3 and the nozzle body 12 through which the supplied via the fuel supply 5 fuel is passed to the sealing seat. In the connection part 4, at least one fuel channel 15 is formed for the connection between the fuel supply 5 and the intermediate space 14.
  • connection part 4 The described encapsulation of the piezoelectric actuator 2 in the actuator housing 3 and the common termination of the actuator housing 3 and the nozzle body 12 through the connection part 4 is characterized in particular by its simple and inexpensive construction.
  • the seal can be done without additional elastomer seals.
  • the connection part 4 can be produced in a simple manner by turning and, in addition to the fuel supply 5, can also receive the electric line for exciting the piezoelectric actuator 2, so that bores in the housing can be dispensed with.
  • the waste heat produced during operation of the piezoelectric actuator 2 can also be dissipated by the fuel flowing past the actuator housing 3 and used, for example, for preheating the fuel.
  • the actuator housing 3 is pushed so far onto the connecting part 4 until the required spring force is reached. In this case, an adjustment gap 16 is established. Subsequently, the actuator housing 3 is connected, for example, by means of a weld 17 with the connection part 4. Also, the nozzle body 12 is also connected to the connection part 4, for example via a weld 18.
  • the piezoelectric actuator 2 If the piezoelectric actuator 2 is excited by an electrical voltage that can be fed from the outside, it expands against the spring force of the closing spring 7 in an outflow direction of the fuel. As a result, the end plate 6 shifts with the valve needle 9, which is in operative connection, likewise in the outflow direction.
  • the standing with the valve needle 9 in non-positive connection valve closing body 11 lifts from the valve seat surface 13, whereby fuel is injected into the combustion chamber of the internal combustion engine, not shown.
  • the invention is not limited to the illustrated embodiment and z. B. also suitable for fuel injection valves 1 with magnetostrictive actuators or for inwardly opening fuel injectors 1.

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

Claims (7)

  1. Soupape d'injection de carburant (1) pour l'injection directe de carburant dans la chambre de combustion d'un moteur à combustion interne, comprenant un actionneur piézoélectrique ou magnétostrictif (2), qui est encapsulé dans un boîtier d'actionneur (3), une aiguille de soupape (9) en liaison fonctionnelle avec l'actionneur, sur laquelle est réalisé un corps de fermeture de soupape (11) qui forme avec une surface de siège de soupape (13) un ajustement étanche, et un corps de buse (12),
    le boîtier d'actionneur (3) étant enfoncé dans le corps de buse (12),
    le boîtier d'actionneur (3) et le corps de buse (12) étant terminés par une partie de raccordement commune (4),
    la partie de raccordement (4) présentant un premier étage de diamètre (19) qui est connecté au boîtier d'actionneur (3), et un deuxième étage de diamètre (20) qui est connecté au corps de buse (20),
    le boîtier d'actionneur (3) étant enfoncé sur le premier étage de diamètre (19) et le corps de buse (12) étant enfoncé sur le deuxième étage de diamètre (20) et
    le deuxième étage de diamètre (20) présentant un plus grand diamètre que le premier étage de diamètre (19),
    caractérisée en ce
    qu'un espace intermédiaire annulaire (14) est réalisé entre le corps de buse (12) et le boîtier d'actionneur (3), lequel sert à amener du carburant à l'ajustement étanche,
    et en ce que la partie de raccordement (4) présente une alimentation en carburant (5) et un canal de carburant (15), l'alimentation en carburant (5) étant connectée à l'espace intermédiaire (14) par le biais du canal de carburant (15).
  2. Soupape d'injection de carburant selon la revendication 1, caractérisée en ce que
    l'actionneur (2) s'appuie du côté de l'afflux contre la partie de raccordement (4).
  3. Soupape d'injection de carburant selon l'une quelconque des revendications 1 et 2,
    caractérisée en ce que
    l'actionneur (2) s'appuie du côté de la sortie contre une plaque frontale (6).
  4. Soupape d'injection de carburant selon la revendication 3,
    caractérisée en ce que
    la plaque frontale (6) est en liaison par engagement par force avec l'aiguille de soupape (9).
  5. Soupape d'injection de carburant selon la revendication 3 ou 4,
    caractérisée en ce que
    l'on dispose un ressort de fermeture (7) entre la plaque frontale (6) et un épaulement (8) du boîtier d'actionneur (3).
  6. Soupape d'injection de carburant selon l'une quelconque des revendications 1 à 5,
    caractérisée en ce que
    le boîtier d'actionneur (3) est connecté à la partie de raccordement (4) par le biais d'un cordon de soudure (17).
  7. Soupape d'injection de carburant selon l'une quelconque des revendications 1 à 6,
    caractérisée en ce que
    le corps de buse (12) est connecté à la partie de raccordement (4) par le biais d'un cordon de soudure (18).
EP02767123A 2001-10-31 2002-08-23 Soupape d'injection de carburant Expired - Lifetime EP1442210B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10153630 2001-10-31
DE10153630A DE10153630A1 (de) 2001-10-31 2001-10-31 Brennstoffeinspritzventil
PCT/DE2002/003093 WO2003040545A1 (fr) 2001-10-31 2002-08-23 Soupape d'injection de carburant

Publications (2)

Publication Number Publication Date
EP1442210A1 EP1442210A1 (fr) 2004-08-04
EP1442210B1 true EP1442210B1 (fr) 2009-08-05

Family

ID=7704269

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02767123A Expired - Lifetime EP1442210B1 (fr) 2001-10-31 2002-08-23 Soupape d'injection de carburant

Country Status (5)

Country Link
US (1) US7063278B2 (fr)
EP (1) EP1442210B1 (fr)
JP (1) JP4280633B2 (fr)
DE (2) DE10153630A1 (fr)
WO (1) WO2003040545A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4002229B2 (ja) * 2003-10-03 2007-10-31 株式会社日立製作所 燃料噴射弁
DE102006013510B4 (de) * 2006-03-23 2008-08-14 Siemens Ag Drucktransfervorrichtung
DE602006005809D1 (de) * 2006-07-25 2009-04-30 Continental Automotive Gmbh Piezoaktoreinheit für ein Einspritzventil
JP4849096B2 (ja) * 2008-06-06 2011-12-28 株式会社デンソー 燃料噴射弁

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63207185A (ja) * 1987-02-23 1988-08-26 Toyota Motor Corp 圧電アクチユエ−タ
US5692723A (en) * 1995-06-06 1997-12-02 Sagem-Lucas, Inc. Electromagnetically actuated disc-type valve
DE19534445C2 (de) 1995-09-16 1998-07-30 Man Nutzfahrzeuge Ag Einspritzventil für Brennkraftmaschinen
EP0869278B1 (fr) * 1997-04-04 2004-03-24 Siemens Aktiengesellschaft Soupape à injection avec moyens de compensation de la dilatation thermique d'un organe d'actionnement piézoélectrique
DE19921489A1 (de) 1999-05-08 2000-11-09 Bosch Gmbh Robert Brennstoffeinspritzventil
DE19925102B4 (de) * 1999-06-01 2013-12-12 Robert Bosch Gmbh Brennstoffeinspritzventil
DE19928204A1 (de) 1999-06-19 2000-12-21 Bosch Gmbh Robert Brennstoffeinspritzventil
DE19943142A1 (de) 1999-09-09 2001-04-12 Siemens Ag Dosiervorrichtung
DE19947079B4 (de) * 1999-09-30 2006-12-28 Siemens Ag Geräuschgedämpfter Stellantrieb für einen Kraftstoffinjektor
DE19956256B4 (de) * 1999-11-23 2004-04-08 Siemens Ag Leerhubeinstellung zwischen einem Aktor und einem Übertragungselement eines Ventils in einem Kraftstoffinjektor
DE19958704C2 (de) * 1999-12-06 2002-10-02 Siemens Ag Vorrichtung zum Übertragen einer Aktorbewegung und Fluiddosierer mit einer solchen Vorrichtung

Also Published As

Publication number Publication date
DE50213748D1 (de) 2009-09-17
EP1442210A1 (fr) 2004-08-04
JP2005508476A (ja) 2005-03-31
US20040094640A1 (en) 2004-05-20
JP4280633B2 (ja) 2009-06-17
US7063278B2 (en) 2006-06-20
DE10153630A1 (de) 2003-07-10
WO2003040545A1 (fr) 2003-05-15

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