WO2005119049A1 - Soupape d'injection - Google Patents

Soupape d'injection Download PDF

Info

Publication number
WO2005119049A1
WO2005119049A1 PCT/EP2005/051994 EP2005051994W WO2005119049A1 WO 2005119049 A1 WO2005119049 A1 WO 2005119049A1 EP 2005051994 W EP2005051994 W EP 2005051994W WO 2005119049 A1 WO2005119049 A1 WO 2005119049A1
Authority
WO
WIPO (PCT)
Prior art keywords
manganese
injection valve
recess
piezo actuator
stack
Prior art date
Application number
PCT/EP2005/051994
Other languages
German (de)
English (en)
Inventor
Günter LEWENTZ
Original Assignee
Siemens Aktiengesellschaft
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 Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Publication of WO2005119049A1 publication Critical patent/WO2005119049A1/fr

Links

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
    • F02M61/166—Selection of particular materials
    • 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

Definitions

  • the invention relates to an injection valve, in particular an injection valve for metering fuel into an internal combustion engine.
  • an injection valve is known with an injector housing which has a recess.
  • a piezo actuator is also assigned to the injection valve, which is arranged in the recess of the injector housing and which comprises a stack of piezoelectric elements.
  • the piezo Actuator is inserted into a tubular spring, which is firmly connected at its axial ends to caps, by means of which a preload force caused by the tubular spring is introduced into the stack of piezoelectric elements.
  • Two bellows are arranged in the recess of the injector housing, which ensure that the piezoelectric actuator does not come into contact with fuel.
  • the injector housing which is regularly made of steel, and the stack of piezoelectric elements have significantly different coefficients of thermal expansion.
  • the stack of piezoelectric elements has a very low coefficient of thermal expansion and the injector housing has a significantly higher coefficient of thermal expansion.
  • a thermal compensating element in the piezo actuator in the axial connection to the stack of piezoelectric elements and to form the latter from aluminum.
  • the object of the invention is to provide an injection valve that simply enables precise control of the injection valve.
  • the invention is characterized by an injection valve with an injector housing, which has a recess, and with a piezo actuator, which in the recess of the injector is arranged and which comprises a stack of piezoelectric elements and a thermal compensation element which consists of a manganese-copper-nickel alloy.
  • the manganese-copper-nickel alloy can also be referred to as a manganese-based alloy. It is characterized by a high temperature coefficient. It is also characterized by a high modulus of elasticity and thus enables very little useful stroke of the piezo actuator to be lost when the piezoelectric elements are lengthened under high load by supplying appropriate electrical energy to the piezo actuator.
  • a low level of spring can also be ensured if, for example, a valve which is driven by the piezo actuator is moved out of its closed position.
  • the manganese-copper-nickel alloy has a proportion of approximately 72% by weight of manganese, 18% by weight of copper and 10% by weight of nickel.
  • the manganese-copper-nickel alloy has a coefficient of thermal expansion ⁇ of approximately 28 x 10- ⁇ 1 / K in a temperature range of approximately 0 to 200 ° C. In contrast to aluminum, the coefficient of thermal expansion is thus approximately 15% higher ,
  • the injection valve can thus be made correspondingly more compact.
  • the manganese-copper-nickel alloy also has an elastic modulus of approx. 125,000 N / mm2. The modulus of elasticity is thus almost twice as high as that of aluminum. In this way, a fuel mass to be metered by means of the injection valve can be improved in the reproducibility of its metering and thus even very small amounts of fuel can be metered very precisely.
  • the single figure shows an injection valve which has an injector housing 1 which has a recess 2 in the injector housing 1.
  • a piezo actuator which is coupled to a transmitter 6, is inserted into the recess 2.
  • the transmitter 6 is arranged in a leakage space 8.
  • the switching valve is coupled to the piezo actuator via the transmitter 6 and is driven by it, that is to say the switching position of the switching valve 10 is set by means of the piezo actuator.
  • the switching valve 10 is arranged in a valve plate 12.
  • the injection valve further comprises a needle guide body 14 and a nozzle body 16.
  • the valve plate 12, the needle guide body 14 and the nozzle body 16 form a nozzle assembly which is fastened to the injector housing 1 by means of a nozzle clamping nut 18.
  • the needle guide body 14 has a recess which is continued as a recess of the nozzle body 16 in the nozzle body 16 and in which a nozzle needle 24 is arranged.
  • the nozzle needle 24 is guided in the needle guide body 14.
  • a nozzle spring 26 biases the nozzle needle 24 into a closed position in which it prevents fuel flow through an injection nozzle 28.
  • a control chamber 30 is formed, which is hydraulically coupled to a high-pressure bore 32 via an inlet throttle. If the switching valve 10 is in its closed position, the control chamber 30 is hydraulically decoupled from the leakage chamber 8. This has the consequence that after the switching valve 10 is closed, the pressure in the control chamber 30 essentially adjusts to the pressure in the high-pressure bore 32.
  • the high-pressure bore 32 is hydraulically coupled to a high-pressure fuel reservoir and is thus supplied with fuel under a pressure of, for example, up to 2000 bar.
  • a pressure in the closing direction of the nozzle needle 24 is exerted on an end face of the nozzle needle 24 via the control chamber 30 due to the fluid pressure in the control chamber 30.
  • the nozzle needle 24 furthermore has a shoulder axially spaced apart from its end face, which is acted upon by fluid that flows through the high-pressure bore 32 in such a way that an opening force acts on the nozzle needle 24. Outside of its closed position, the nozzle needle 24 releases the fuel flow through the injection nozzle 28. Whether the nozzle needle 24 is in its closed position or outside its closed position depends on whether the force which is caused on the shoulder of the nozzle needle 24 by the pressure of the fluid there is greater or less than the force which is caused by the nozzle spring 26 and the pressure acting on the end face of the nozzle needle 24.
  • the switching valve 10 If the switching valve 10 is in its open position, fluid flows from the control chamber 30 through the switching valve 10 into the leakage chamber 8. With a suitable dimensioning of the inlet throttle, the pressure in the control chamber 30 then drops, which ultimately leads to a movement of the nozzle needle 24 out of it Closing position leads out.
  • the pressure of the fluid in the le- Storage space 8 is significantly lower than the pressure of the fluid in high-pressure bore 32.
  • the piezo actuator comprises a stack 34 of piezoelectric elements and a thermal compensating element 36.
  • the stack of piezoelectric elements 34 and the thermal compensating element 36 are introduced into a tubular spring.
  • the tubular spring is welded at its one axial end to a first cap, which can optionally be designed as the transmitter 6.
  • the tubular spring is welded to a fixing element 38.
  • the Bourdon tube is under a predetermined preload and thus prestresses the stack of piezoelectric elements with a predeterminable force.
  • the fixing element 38 is preferably connected to the injector housing 1 in a positive and / or non-positive manner, in particular caulking.
  • the thermal compensation element 36 consists of a manganese-copper-nickel alloy, which is referred to below as a manganese-based alloy.
  • the thermal compensating element 36 is preferably made of a block, which is preferably cylindrical in shape of the manganese-based alloy.
  • the manganese base alloy advantageously consists of approximately 72% by weight of manganese, approximately 18% by weight of copper and approximately 10% by weight of nickel. It has a coefficient of thermal expansion of approximately 28 x 10 -6 1 / K in the temperature range from 0 to 200 ° C.
  • the axial length of the thermal compensation element 36 is selected such that the piezo actuator has the same thermal expansion behavior as that Material from which the injector housing 1 is made.
  • the switching behavior of the piezo actuator is constant with regard to the control of the switching valve 10 supported.
  • the high stiffness of the manganese base alloy of the thermal compensating element 36 which is characterized in particular by a high manganese content, ensures that when the stack 34 of the piezoelectric elements is lengthened by the high force which also acts on the thermal compensating element 36 from the valve 10 , only a small useful stroke of the stack 34 of the piezoelectric elements is lost.
  • the control of the stack 34 of the piezoelectric elements can take place with a very high degree of efficiency.

Landscapes

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

Abstract

L'invention concerne une soupape d'injection comprenant un corps d'injecteur (1) dans lequel est ménagé un évidement (2). Cette soupape comprend par ailleurs un actionneur piézoélectrique qui est disposé dans l'évidement (2) du corps d'injecteur (1) et qui comprend un empilement (34) d'éléments piézoélectriques et un élément de compensation thermique (36) constitué d'un alliage manganèse-cuivre-nickel.
PCT/EP2005/051994 2004-06-03 2005-05-02 Soupape d'injection WO2005119049A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004027148.8 2004-06-03
DE200410027148 DE102004027148A1 (de) 2004-06-03 2004-06-03 Einspritzventil

Publications (1)

Publication Number Publication Date
WO2005119049A1 true WO2005119049A1 (fr) 2005-12-15

Family

ID=34968557

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2005/051994 WO2005119049A1 (fr) 2004-06-03 2005-05-02 Soupape d'injection

Country Status (2)

Country Link
DE (1) DE102004027148A1 (fr)
WO (1) WO2005119049A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008116716A1 (fr) * 2007-03-23 2008-10-02 Continental Automotive Gmbh Dispositif actionneur pourvu d'un actionneur piézoélectrique pour un injecteur de carburant

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004048395B4 (de) * 2004-10-05 2015-12-10 Continental Automotive Gmbh Piezo-Einspritzventil mit Kontaktelementen zur Wärmeableitung

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4284263A (en) * 1978-05-08 1981-08-18 U.S. Philips Corporation Temperature-compensated control valve
DE19909106A1 (de) * 1999-03-02 2000-09-07 Siemens Ag Temperaturkompensierte Aktoreinheit mit einem Piezoelement
US6422482B1 (en) * 1998-10-26 2002-07-23 Robert Bosch Gmbh Fuel injection valve
WO2003054378A1 (fr) * 2001-12-05 2003-07-03 Robert Bosch Gmbh Soupape d'injection de carburant
DE10219149A1 (de) * 2002-04-29 2003-11-20 Siemens Ag Injektor zum Einspritzen von Kraftstoff
DE10233906A1 (de) * 2002-07-25 2004-02-19 Siemens Ag Einspritzmodul

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4284263A (en) * 1978-05-08 1981-08-18 U.S. Philips Corporation Temperature-compensated control valve
US6422482B1 (en) * 1998-10-26 2002-07-23 Robert Bosch Gmbh Fuel injection valve
DE19909106A1 (de) * 1999-03-02 2000-09-07 Siemens Ag Temperaturkompensierte Aktoreinheit mit einem Piezoelement
WO2003054378A1 (fr) * 2001-12-05 2003-07-03 Robert Bosch Gmbh Soupape d'injection de carburant
DE10219149A1 (de) * 2002-04-29 2003-11-20 Siemens Ag Injektor zum Einspritzen von Kraftstoff
DE10233906A1 (de) * 2002-07-25 2004-02-19 Siemens Ag Einspritzmodul

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008116716A1 (fr) * 2007-03-23 2008-10-02 Continental Automotive Gmbh Dispositif actionneur pourvu d'un actionneur piézoélectrique pour un injecteur de carburant

Also Published As

Publication number Publication date
DE102004027148A1 (de) 2005-12-29

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