EP1445480B1 - Dosiervorrichtung mit Dynamischer Abdichtung - Google Patents

Dosiervorrichtung mit Dynamischer Abdichtung Download PDF

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Publication number
EP1445480B1
EP1445480B1 EP20030002402 EP03002402A EP1445480B1 EP 1445480 B1 EP1445480 B1 EP 1445480B1 EP 20030002402 EP20030002402 EP 20030002402 EP 03002402 A EP03002402 A EP 03002402A EP 1445480 B1 EP1445480 B1 EP 1445480B1
Authority
EP
European Patent Office
Prior art keywords
valve needle
fluid chamber
valve
end position
chamber
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 - Fee Related
Application number
EP20030002402
Other languages
English (en)
French (fr)
Other versions
EP1445480A1 (de
Inventor
Luca Gestri
Luca Matteucci
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.)
Continental Automotive Italy SpA
Original Assignee
Siemens VDO Automotive SpA
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 Siemens VDO Automotive SpA filed Critical Siemens VDO Automotive SpA
Priority to DE2003604816 priority Critical patent/DE60304816T2/de
Priority to EP20030002402 priority patent/EP1445480B1/de
Publication of EP1445480A1 publication Critical patent/EP1445480A1/de
Application granted granted Critical
Publication of EP1445480B1 publication Critical patent/EP1445480B1/de
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • F02M61/10—Other injectors with elongated valve bodies, i.e. of needle-valve type
    • F02M61/12—Other injectors with elongated valve bodies, i.e. of needle-valve type characterised by the provision of guiding or centring means for valve bodies
    • 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
    • F02M61/04—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
    • F02M61/16—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
    • 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
    • F02M2200/70—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
    • F02M2200/707—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger hydraulic with means for avoiding fuel contact with actuators, e.g. isolating actuators by using bellows or diaphragms

Definitions

  • the present invention relates to a metering device for dosing pressurized fluids, in particular an injection valve for a fuel injection system in an internal combustion engine, comprising a valve body with a fluid chamber for the pressurized fluid to be dosed, the fluid chamber terminating with a metering opening, an axially moveable valve needle passing through the fluid chamber, the valve needle having a first end that controls the opening and closing of the metering opening, and a second end that cooperates with an actuator assembly arranged in an actuator chamber and controlling the axial movement of the valve needle to be in a first end position in which the metering opening is closed and in a second end position in which the metering opening is open, and a sealing element hydraulically isolating the actuator chamber and the fluid chamber.
  • the valve body 1 comprises an actuator chamber 9 and a fluid chamber 2 terminating with a metering opening 3, between which chambers the sealing element 101 - 10n is arranged.
  • the axially moveable valve needle 4 passes through the fluid chamber 2.
  • the valve needle 4 has a first end 5 that controls the opening and closing of the metering opening 3, and a second end 6 that cooperates with the actuator assembly 7, 8 arranged in the actuator chamber 9 and controlling the axial movement of the valve needle 4.
  • the actuator assembly comprises a piezo stack 7 and a bottom cap 8.
  • the bottom cap 8 of the actuator assembly is in Hertzian contact with the second end 6 of the valve needle 4, since the second end 6 of the valve needle 4 is biased against the bottom cap 8 by a helical spring 12, which is axially compressed arranged between a spring seat 14 of the valve body 1 and an abutting washer 13 fastened to the valve needle 4.
  • the sealing element 101 - 10n is formed by a metal bellows 101, an element able to be axially deformed and to guarantee the required separation between the two described volumes, e.g. gasoline in the fluid chamber 2 and the piezo stack 7 as part of the actuator assembly outside, i.e. in the actuator chamber 9.
  • the top collar of the metal bellows 101 is attached to a washer 10m that is attached on the valve needle 4 and the bottom collar of the metal bellows 101 is attached to a ring element 10n attached to the inner cylindrical surface 11 of the valve body 1.
  • the metal bellows 101 offers a high mechanical elasticity in the direction of movement of the valve needle 4, a sufficient resistance to fuel pressures of up to 500 bar, and a high reliability with respect to leakage throughout the required temperature range of -40 °C to +150 °C.
  • an injector with such a metal bellows with these dimensions has disadvantages of high component and manufacturing costs, as well as a complex assembly, requiring two hermetic welds to attach the metal bellows to the washer 10m and to the ring element 10n, as well as two hermetic welds to attach the washer 10m to the valve needle 4 and the ring element 10n to the inner cylindrical surface 11 of the valve body 1.
  • US 3,703,184 discloses a sealing means for fuel injection valves comprising a cylindrical guide sleeve that guides a valve needle in fluid-tight manner and that has a spherical head cooperating with a support in the valve body for centring the valve needle.
  • a shoulder of the valve body supports a first metal ring, that has a radial clearance with respect to the guide sleeve, on which a second metal ring, that is in contact with the guide sleeve with its inner face and has a radial clearance with respect to the valve body, is arranged to allow a sliding movement of the guide sleeve with respect to the valve body in radial direction.
  • An elastic packing ring is arranged slightly compressed between the valve body, the second metal ring, the cylindrical part of the guide sleeve and a shoulder of the spherical head of the guide sleeve and thus provides a sealing between the valve body and the guide sleeve in axial and radial direction.
  • the sealing element is formed by a sleeve that comprises a hollow cylinder section in hermetic rigid contact with the valve needle and a flange section hermetically connected to the hollow cylinder section, and a first elastic ring that is arranged axially compressed between a sealing seat of the valve body and the flange section to hermetically seal the actuator chamber and the fluid chamber in the first end position of the valve needle, in the second end position of the valve needle and in all positions of the valve needle between these end positions.
  • the hollow cylinder section of the sleeve is hermetically sealed to the valve needle by a second elastic ring.
  • the first and/or second elastic rings are made of a resilient material, such as rubber.
  • the material itself provides the elastic properties to the sealing according to the present invention.
  • the first and/or second elastic rings preferably have a circular cross section in an uncompressed state.
  • Elastic rings with circular cross sections are available in different sizes and shapes so that employing such elastic rings with circular cross sections is particularly cost effective.
  • the sleeve is preferably made of metal. Thereby, the required rigidity of the sealing is provided.
  • the sleeve is welded to the valve needle, preferably hermetically.
  • the hermetic sealing between the fluid chamber 2 and the actuator chamber 9 is performed by a metallic sleeve and an elastic element.
  • the metallic sleeve comprises a hollow cylinder section 10a in hermetic rigid contact with the valve needle 4 and a flange section 10b hermetically connected to the hollow cylinder section 10a.
  • the elastic element is a first elastic ring 10c that is axially so compressed arranged between a sealing seat 15 of the valve body 1 and the flange section 10b that a sealing is provided in all positions of the valve needle 4.
  • the hollow cylinder section 10a of the sleeve is hermetically sealed to the valve needle 4 by a second elastic ring 10d.
  • the hollow cylinder section might be rigidly and hermetically welded to the valve needle 4.
  • a metering device for dosing pressurized fluids in particular an injection valve for a fuel injection system in an internal combustion engine, is disclosed in which the hermetic sealing between the fluid chamber for the pressurized fluid to be dosed and the actuator chamber is provided by an elastic element.
  • the elastic element is arranged in a compressed manner between a sealing seat of the valve body and a flange section of a metallic sleeve that additionally comprises a hollow cylinder section in hermetic rigid contact with the valve needle.

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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 (5)

  1. Dosiervorrichtung zur Dosierung von unter Druck stehenden Kraftstoffen, insbesondere ein Einspritzventil für ein Kraftstoffeinspritzsystem in einer Kraftmaschine mit innerer Verbrennung, das Folgendes umfasst:
    - einen Ventilkörper (1, 14), der eine Kraftstoffkammer (2) zur Dosierung von unter Druck stehendem Kraftstoff umfasst, wobei sich am Ende der Kraftstoffkammer (2) eine Dosieröffnung (3) befindet,
    - eine axial bewegliche Ventilnadel (4), die durch die Kraftstoffkammer (2) verläuft, wobei die Ventilnadel (4) ein erstes Ende (5) umfasst, das zum Öffnen und Schließen der Dosieröffnung (3) dient, und ein zweites Ende (6), das mit einer Aktuatorbaugruppe (7, 8) zusammenwirkt, die in einer Aktuatorkammer (9) angeordnet ist und die axiale Bewegung der Ventilnadel (4) steuert, so dass sie in eine erste Endposition gelangt, in der die Dosieröffnung (3) geschlossen ist, und in eine zweite Endposition, in der die Dosieröffnung (3) geöffnet ist, und
    - ein Dichtelement (10a - 10d), das die Aktuatorkammer (9) und die Kraftstoffkammer (2) hydraulisch trennt und das ausgebildet ist aus
    - einer Metallhülse (10a, 10b), die einen Hohlzylinderbereich (10a) umfasst, der hermetisch dicht in innigem Kontakt mit der Ventilnadel (4) ist, und einem Flanschbereich (10b), der hermetisch dicht mit dem Hohlzylinderbereich (10a) verbunden ist, und
    - einem ersten elastischen Ring (10c), der axial zusammengedrückt angeordnet ist zwischen einem Dichtsitz (15) des Ventilkörpers (1) und dem Flanschbereich (10b), um die Aktuatorkammer (9) und die Kraftstoffkammer (2) in der ersten Endposition der Ventilnadel (4), in der zweiten Endposition der Ventilnadel (4) und in allen Ventilnadelpositionen zwischen diesen Endpositionen hermetisch abzudichten,
    dadurch gekennzeichnet, dass
    der Hohlzylinderbereich (10a) der Hülse (10a, 10b) durch einen zweiten elastischen Ring (10d) hermetisch gegenüber der Ventilnadel abgedichtet ist.
  2. Dosiervorrichtung zur Dosierung von unter Druck stehenden Kraftstoffen, insbesondere ein Einspritzventil für ein Kraftstoffeinspritzsystem in einer Kraftmaschine mit innerer Verbrennung, das Folgendes umfasst:
    - einen Ventilkörper (1, 14), der eine Kraftstoffkammer (2) zur Dosierung von unter Druck stehendem Kraftstoff umfasst, wobei sich am Ende der Kraftstoffkammer (2) eine Dosieröffnung (3) befindet,
    - eine axial bewegliche Ventilnadel (4), die durch die Kraftstoffkammer (2) verläuft, wobei die Ventilnadel (4) ein erstes Ende (5) umfasst, das zum Öffnen und Schließen der Dosieröffnung (3) dient, und ein zweites Ende (6), das mit einer Aktuatorbaugruppe (7, 8) zusammenwirkt, die in einer Aktuatorkammer (9) angeordnet ist und die axiale Bewegung der Ventilnadel (4) steuert, so dass sie in eine erste Endposition gelangt, in der die Dosieröffnung (3) geschlossen ist, und in eine zweite Endposition, in der die Dosieröffnung (3) geöffnet ist, und
    - ein Dichtelement (10a - 10d), das die Aktuatorkammer (9) und die Kraftstoffkammer (2) hydraulisch trennt und das ausgebildet ist aus
    - einer Metallhülse (10a, 10b), die einen Hohlzylinderbereich (10a) umfasst, der hermetisch dicht in innigem Kontakt mit der Ventilnadel (4) ist, und einem Flanschbereich (10b), der hermetisch dicht mit dem Hohlzylinderbereich (10a) verbunden ist, und
    - einem ersten elastischen Ring (10c), der axial zusammengedrückt angeordnet ist zwischen einem Dichtsitz (15) des Ventilkörpers (1) und dem Flanschbereich (10b), um die Aktuatorkammer (9) und die Kraftstoffkammer (2) in der ersten Endposition der Ventilnadel (4), in der zweiten Endposition der Ventilnadel (4) und in allen Ventilnadelpositionen zwischen diesen Endpositionen hermetisch abzudichten,
    dadurch gekennzeichnet, dass
    die Hülse (10a, 10b) an die Ventilnadel (4) geschweißt ist.
  3. Dosiervorrichtung nach Anspruch 1 oder 2,
    dadurch gekennzeichnet, dass
    der erste und/oder der zweite elastische Ring (10c, 10d) aus einem elastischen Material wie zum Beispiel Gummi hergestellt sind.
  4. Dosiervorrichtung nach einem der Ansprüche 1 bis 3,
    dadurch gekennzeichnet, dass
    der erste und/oder der zweite elastische Ring (10c, 10d) in nicht zusammengedrücktem Zustand vorzugsweise einen kreisförmigen Querschnitt aufweisen.
  5. Dosiervorrichtung nach einem der Ansprüche 1 bis 4,
    dadurch gekennzeichnet, dass
    die Hülse (10a, 10b) aus Metall hergestellt ist.
EP20030002402 2003-02-04 2003-02-04 Dosiervorrichtung mit Dynamischer Abdichtung Expired - Fee Related EP1445480B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE2003604816 DE60304816T2 (de) 2003-02-04 2003-02-04 Dosiervorrichtung mit Dynamischer Abdichtung
EP20030002402 EP1445480B1 (de) 2003-02-04 2003-02-04 Dosiervorrichtung mit Dynamischer Abdichtung

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20030002402 EP1445480B1 (de) 2003-02-04 2003-02-04 Dosiervorrichtung mit Dynamischer Abdichtung

Publications (2)

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EP1445480A1 EP1445480A1 (de) 2004-08-11
EP1445480B1 true EP1445480B1 (de) 2006-04-26

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EP (1) EP1445480B1 (de)
DE (1) DE60304816T2 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1808596A1 (de) * 2006-01-12 2007-07-18 Siemens Aktiengesellschaft Ventilanordnung für ein Kraftstoffeinspritzventil und Kraftstoffeinspritzventil
DE102006050165A1 (de) * 2006-10-25 2008-04-30 Robert Bosch Gmbh Aktor mit Fluidisolierung

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2032005A1 (de) * 1970-06-29 1972-01-05 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoffeinspritzventil
DE3009461C2 (de) * 1980-03-12 1994-02-10 Daimler Benz Ag Kraftstoffeinspritzdüse für eine Brennkraftmaschine
EP1046809B1 (de) 1999-04-20 2005-08-10 Siemens Aktiengesellschaft Fluiddosiervorrichtung
DE19956830C2 (de) * 1999-11-25 2002-07-18 Siemens Ag Durchführung

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Publication number Publication date
DE60304816T2 (de) 2006-11-02
EP1445480A1 (de) 2004-08-11
DE60304816D1 (de) 2006-06-01

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