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EP1450034B1 - Fuel injector - Google Patents

Fuel injector Download PDF

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Publication number
EP1450034B1
EP1450034B1 EP03025329A EP03025329A EP1450034B1 EP 1450034 B1 EP1450034 B1 EP 1450034B1 EP 03025329 A EP03025329 A EP 03025329A EP 03025329 A EP03025329 A EP 03025329A EP 1450034 B1 EP1450034 B1 EP 1450034B1
Authority
EP
European Patent Office
Prior art keywords
fuel injection
injection valve
valve according
coupler
hydraulic
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
EP03025329A
Other languages
German (de)
French (fr)
Other versions
EP1450034A1 (en
Inventor
Martin Maier
Guenther Hohl
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
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Filing date
Publication date
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Publication of EP1450034A1 publication Critical patent/EP1450034A1/en
Application granted granted Critical
Publication of EP1450034B1 publication Critical patent/EP1450034B1/en
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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
    • 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
    • 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
    • F02M2200/90—Selection of particular materials
    • F02M2200/9084—Rheological fluids
    • 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

Definitions

  • the invention relates to a fuel injection valve according to the preamble of the main claim.
  • a Fluiddosiervorraum known, which comprises a housing substantially, a therein under fluid pressure chamber and a valve needle passed through the valve, wherein a first end of the valve needle outside of the chamber is acted upon by a hub and the second end with a valve seat positioned on the housing forms a valve associated with the chamber.
  • a lead-through element for the valve needle at the first end of a metal bellows is used, which hermetically seals and generates only small axial pressure-related forces.
  • the DE 197 08 304 A1 discloses a device for transmitting a movement for an injection valve, wherein between a piezoelectric actuator and a drive piston, a transmission module is arranged, which has at least one pressure chamber which is closed via a first membrane. The pressure chamber is connected via a throttle with a compensation chamber, which is also arranged in the transmission module.
  • the DE 43 06 072 A1 discloses a fuel injector having a piezoelectric actuator arranged in a housing, a stroke transformer consisting of a pressure and reciprocating piston, a valve stem connected to the piston and a closing spring which presses the valve disk in the resting state onto the valve seal.
  • the compensation chamber connected to the hydraulic chamber via an annular gap existing between the piston and the housing is filled with a medium under overpressure. Since a diaphragm transfers the overpressure built up in the compensation chamber to the hydraulic fluid, there can be no gas bubbles which reduce the operating frequency of the valve.
  • the DE 100 44 120 A1 discloses a common rail system including a valve for actuating a fluid having an actuator unit for actuating an axially displaceable valve member associated with a valve closure member which cooperates with a valve seat to open and close the valve and which defines a high pressure area separates the valve.
  • a high pressure area is the fluid to be controlled Under a working pressure and possibly occurring overpressure is registered by the fact that the actuator unit is designed as a force measuring sensor.
  • the fuel injection valve according to the invention with the characterizing features of the main claim has the advantage that the hydraulic coupler remains functional even at low fuel pressures, resulting in the use of a special hydraulic fluid such.
  • a special hydraulic fluid such as silicone oil, and a suitable design of the coupler with a different positions engaging membrane is made possible.
  • the membrane can be folded back and forth between two positions so as to be able to produce a maximum or minimum volume of the compensation chamber depending on the operating state of the fuel injection valve.
  • coupler space can optionally be filled with a rheological fluid.
  • Fig. 1 shows in a highly schematic view a section through a first embodiment of an inventively designed fuel injector 1.
  • the fuel injector 1 is particularly suitable for direct injection of fuel into the combustion chamber of a mixture-compressing, spark-ignited internal combustion engine.
  • the fuel injection valve 1 comprises a piezoelectric or magnetostrictive actuator 2, which is encapsulated in a sleeve 3 and biased by a biasing spring 4.
  • An actuator cartridge 5 contains in addition to the actuator 2 and the biasing spring 4 on the upstream side of the actuator 2, a coupler 6 and downstream an actuator 7.
  • the actuator cartridge 5 is sealed by a corrugated pipe 8 against a fuel-carrying interior 9.
  • the coupler element 6 comprises a coupler space 10, which is filled, for example, with silicone oil.
  • the coupler space 10 is also sealed by a corrugated tube seal 11.
  • the corrugated tube is radially stiff. Filled, it can therefore support axial forces.
  • a coupler spring 12 is arranged in the coupler space, which ensures that a coupler foot 13 is always held in contact with the actuator 2.
  • a coupler head 14 is supported on a shoulder 15 on the actuator cartridge 5.
  • a pin 17 is arranged, which is positively connected to the actuator base 13 and is guided in the recess 16.
  • an annular gap 18 is formed, which allows the transition of hydraulic fluid in a compensation chamber 19. As a result, slow volume changes due to thermal processes in the coupler 6 are possible.
  • the compensation chamber 19 is closed by a membrane 20.
  • the diaphragm 20 is shown in a first position which defines a maximum compensation space 19.
  • Fig. 1B represents the membrane 20 in a second position, which defines a minimum compensation space 19.
  • intermediate positions are possible.
  • the folding of the diaphragm 20 from the second to the first position is achieved by the displacement of the hydraulic medium in the compensating volume 19, while the folding back into the starting position, for example by a only in Fig. 1B shown return spring 21 can be adopted.
  • the two positions of the membrane 20 can ensure that temperature changes of the actuator 2 are compensated.
  • the inventively designed fuel injector 1 further comprises an electrical line 22 for contacting the actuator 2 and a housing 23, in which the coupler 6 and a valve group 24 is arranged are.
  • the valve group 24 includes a support member 25 which is in operative connection with a valve needle 26.
  • a valve closing body 27 is formed, which forms a sealing seat with a arranged on the housing 23 valve seat surface 28.
  • a return spring 29 is clamped between the support member 25 and the housing 23.
  • a seal 30 seals the fuel injection valve 1 against a cylinder head, not shown, of the internal combustion engine.
  • the coupler space 10 in Fig. 1A and 1B is filled with any hydraulic fluid, which only meets the requirement not to evaporate at rapid pressure relief
  • the coupler space 10 in the in Fig. 2 shown second embodiment of an inventively designed fuel injection valve 1 filled with a rheological fluid.
  • a rheological fluid behaves at slow, so z. B. thermal length changes such as a liquid at rapid changes in length of the actuator 2, ie z. B. when excited the same as a solid.
  • the compensation of the rheological fluid via the recess 16 reacts both slowly enough with thermal change in length as well as sufficiently stiff when the actuator is energized.

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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)

Abstract

Fuel injection valve (1) for direct injection of fuel into a combustion chamber of an internal combustion engine comprises an excitable actuator (2), a valve needle (26) actuating a valve-closing body (27) forming a sealing seat together with a valve seat surface (28), and a hydraulic coupler (6) having a hydraulic volume (10) and a compensation chamber (19). The volume of the compensation chamber is changed by a membrane (20). Preferred Features: The membrane is moved by silicone oil between a first position corresponding to a maximum compensation chamber and a second position corresponding to a minimum compensation chamber.

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einem Brennstoffeinspritzventil nach der Gattung des Hauptanspruchs.The invention relates to a fuel injection valve according to the preamble of the main claim.

Beispielsweise ist aus der EP 1 046 809 A2 eine Fluiddosiervorrichtung bekannt, welche im wesentlichen ein Gehäuse, eine darin befindliche unter Fluiddruck stehende Kammer und eine durch die Kammer hindurchgeführte Ventilnadel umfaßt, wobei ein erstes Ende der Ventilnadel außerhalb der Kammer mit einem Hub beaufschlagbar ist und deren zweites Ende mit einem am Gehäuse positionierten Ventilsitz ein mit der Kammer in Verbindung stehendes Ventil bildet. Als Durchführungselement für die Ventilnadel an deren erstem Ende wird ein Metallbalg eingesetzt, der hermetisch abdichtet und nur geringe axiale druckbedingte Kräfte erzeugt.For example, is from the EP 1 046 809 A2 a Fluiddosiervorrichtung known, which comprises a housing substantially, a therein under fluid pressure chamber and a valve needle passed through the valve, wherein a first end of the valve needle outside of the chamber is acted upon by a hub and the second end with a valve seat positioned on the housing forms a valve associated with the chamber. As a lead-through element for the valve needle at the first end of a metal bellows is used, which hermetically seals and generates only small axial pressure-related forces.

Nachteilig bei der aus der EP 1 046 809 A2 bekannten Fluiddosiervorrichtung ist insbesondere, daß diese ausschließlich für konstante, sehr hohe Fluiddrücke ausgelegt ist. Bei einem Druckabfall während des Betriebs der Fluiddosiervorrichtung, insbesondere, wenn die Vorrichtung zur Zumessung von Brennstoff in einer Brennkraftmaschine verwendet wird, verdampft das Hydraulikmedium, was zu Fehlfunktionen des Kopplers führt.The disadvantage of the EP 1 046 809 A2 known fluid metering device is in particular that this is designed exclusively for constant, very high fluid pressures. At a pressure drop during operation of the Fluiddosiervorrichtung, in particular, when the device for metering fuel in a Internal combustion engine is used, the hydraulic medium evaporates, resulting in malfunction of the coupler.

Die DE 197 08 304 A1 offenbart eine Vorrichtung zur Übertragung einer Bewegung für ein Einspritzventil, bei der zwischen einem piezoelektrischen Aktor und einem Antriebskolben ein Übertragungsmodul angeordnet ist, das mindestens eine Druckkammer aufweist, die über eine erste Membran abgeschlossen ist. Die Druckkammer ist über eine Drossel mit einer Ausgleichskammer verbunden, die ebenfalls im Übertragungsmodul angeordnet ist.The DE 197 08 304 A1 discloses a device for transmitting a movement for an injection valve, wherein between a piezoelectric actuator and a drive piston, a transmission module is arranged, which has at least one pressure chamber which is closed via a first membrane. The pressure chamber is connected via a throttle with a compensation chamber, which is also arranged in the transmission module.

Die DE 43 06 072 A1 offenbart ein Brennstoffeinspritzventil mit einem in einem Gehäuse angeordneten Piezoaktor, einem aus einem Druck- und Hubkolben bestehenden Hubtransformator, einem mit dem Hubkolben verbundenen Ventilstößel und einer Schließfeder, die den Ventilteller im Ruhezustand auf die Ventildichtung presst. Die über einen zwischen dem Hubkolben und dem Gehäuse vorhandenen Ringspalt mit der Hydraulikkammer verbundene Ausgleichskammer ist mit einem unter Überdruck stehenden Medium gefüllt. Da eine Membran den in der Ausgleichskammer aufgebauten Überdruck auf die Hydraulikflüssigkeit überträgt, können dort keine die Arbeitsfrequenz des Ventils herabsetzenden Gasblasen entstehen.The DE 43 06 072 A1 discloses a fuel injector having a piezoelectric actuator arranged in a housing, a stroke transformer consisting of a pressure and reciprocating piston, a valve stem connected to the piston and a closing spring which presses the valve disk in the resting state onto the valve seal. The compensation chamber connected to the hydraulic chamber via an annular gap existing between the piston and the housing is filled with a medium under overpressure. Since a diaphragm transfers the overpressure built up in the compensation chamber to the hydraulic fluid, there can be no gas bubbles which reduce the operating frequency of the valve.

Die DE 100 44 120 A1 offenbart ein Common-Rail-System, welches ein Ventil zum Ansteuern eines Fluids mit einer Aktuator-Einheit zur Betätigung eines axial verschiebbaren Ventilglieds umfasst, dem ein Ventilschließglied zugeordnet ist, das zum Öffnen und Schließen des Ventils mit einem Ventilsitz zusammenwirkt und das einen Hochdruckbereich von dem Ventil trennt. In dem Hochdruckbereich befindet sich das anzusteuernde Fluid unter einem Arbeitsdruck und ein unter Umständen auftretende Überdruck wird dadurch registriert, dass die Aktuator-Einheit als Kraftmesssensor ausgebildet ist.The DE 100 44 120 A1 discloses a common rail system including a valve for actuating a fluid having an actuator unit for actuating an axially displaceable valve member associated with a valve closure member which cooperates with a valve seat to open and close the valve and which defines a high pressure area separates the valve. In the high pressure area is the fluid to be controlled Under a working pressure and possibly occurring overpressure is registered by the fact that the actuator unit is designed as a force measuring sensor.

Vorteile der ErfindungAdvantages of the invention

Das erfindungsgemäße Brennstoffeinspritzventil mit den kennzeichnenden Merkmalen des Hauptanspruchs hat demgegenüber den Vorteil, daß der hydraulische Koppler auch bei niedrigen Brennstoffdrücken funktionstüchtig bleibt, was durch den Einsatz eines speziellen Hydraulikfluids, wie z. B. Silikonöl, sowie einer geeigneten Auslegung des Kopplers mit einer verschiedene Positionen einnehmenden Membran ermöglicht wird.The fuel injection valve according to the invention with the characterizing features of the main claim has the advantage that the hydraulic coupler remains functional even at low fuel pressures, resulting in the use of a special hydraulic fluid such. As silicone oil, and a suitable design of the coupler with a different positions engaging membrane is made possible.

Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterentwicklungen des im Hauptanspruch angegebenen Brennstoffeinspritzventils möglich.The measures listed in the dependent claims advantageous developments of the fuel injection valve specified in the main claim are possible.

Vorteilhafterweise kann die Membran zwischen zwei Stellungen hin- und hergeklappt werden, um so ein maximales oder minimales Volumen des Ausgleichsraums je nach Betriebszustand des Brennstoffeinspritzventils herstellen zu können.Advantageously, the membrane can be folded back and forth between two positions so as to be able to produce a maximum or minimum volume of the compensation chamber depending on the operating state of the fuel injection valve.

Weiterhin ist vorteilhaft, daß durch einen Spalt zwischen einem in einer Bohrung des Kopplerkopfes geführten Ausnehmung der Ausgleich von Hydraulikfluid in den Ausgleichsraum in einfacher Weise ermöglicht wird, ohne das Hydraulikvolumen zu stark zu entleeren.Furthermore, it is advantageous that by a gap between a guided in a bore of the coupler head recess of the compensation of hydraulic fluid in the expansion chamber is made possible in a simple manner, without draining the hydraulic volume too much.

Von Vorteil ist außerdem, daß der Kopplerraum wahlweise auch mit einer rheologischen Flüssigkeit gefüllt sein kann.Another advantage is that the coupler space can optionally be filled with a rheological fluid.

Zeichnungdrawing

Ausführungsbeispiele der Erfindung sind in der Zeichnung vereinfacht dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen:

Fig. 1A
einen schematischen Schnitt durch ein erstes Ausführungsbeispiel eines erfindungsgemäß ausgestalteten Brennstoffeinspritzventils in einem ersten Betriebszustand,
Fig. 1B
einen schematischen Ausschnitt aus dem in Fig. 1 dargestellten ersten Ausführungsbeispiel des erfindungsgemäßen Brennstoffeinspritzventils im Bereich IB in einem zweiten Betriebszustand, und
Fig. 2
einen schematischen Ausschnitt aus einem zweiten Ausführungsbeispiel eines erfindungsgemäßen Brennstoffeinspritzventils im Bereich IB mit einem alternativen Kopplermedium, jedoch bei nicht gezeigtem Stift.
Embodiments of the invention are shown in simplified form in the drawing and explained in more detail in the following description. Show it:
Fig. 1A
FIG. 2 shows a schematic section through a first exemplary embodiment of a fuel injection valve designed according to the invention in a first operating state, FIG.
Fig. 1B
a schematic section of the in Fig. 1 illustrated first embodiment of the fuel injection valve according to the invention in the area IB in a second operating state, and
Fig. 2
a schematic section of a second embodiment of a fuel injection valve according to the invention in the area IB with an alternative coupler medium, but not shown pin.

Beschreibung der AusführungsbeispieleDescription of the embodiments

Nachfolgend werden Ausführungsbeispiele der Erfindung beispielhaft beschrieben. Übereinstimmende Bauteile sind dabei in allen Figuren mit übereinstimmenden Bezugszeichen versehen.Hereinafter, embodiments of the invention will be described by way of example. Matching components are provided in all figures with matching reference numerals.

Fig. 1 zeigt dabei in einer stark schematisierten Ansicht einen Schnitt durch ein erstes Ausführungsbeispiel eines erfindungsgemäß ausgestalteten Brennstoffeinspritzventils 1. Das Brennstoffeinspritzventil 1 ist insbesondere zum direkten Einspritzen von Brennstoff in den Brennraum einer gemischverdichtenden, fremdgezündeten Brennkraftmaschine geeignet. Fig. 1 shows in a highly schematic view a section through a first embodiment of an inventively designed fuel injector 1. The fuel injector 1 is particularly suitable for direct injection of fuel into the combustion chamber of a mixture-compressing, spark-ignited internal combustion engine.

Das Brennstoffeinspritzventil 1 umfaßt einen piezoelektrischen oder magnetostriktiven Aktor 2, der in einer Hülse 3 gekapselt und durch eine Vorspannfeder 4 vorgespannt ist. Eine Aktorpatrone 5 enthält neben dem Aktor 2 und der Vorspannfeder 4 zuströmseitig des Aktors 2 ein Kopplerelement 6 und abströmseitig ein Betätigungselement 7. Die Aktorpatrone 5 ist durch eine Wellrohrdichtung 8 gegen einen von Brennstoff durchflossenen Innenraum 9 abgedichtet.The fuel injection valve 1 comprises a piezoelectric or magnetostrictive actuator 2, which is encapsulated in a sleeve 3 and biased by a biasing spring 4. An actuator cartridge 5 contains in addition to the actuator 2 and the biasing spring 4 on the upstream side of the actuator 2, a coupler 6 and downstream an actuator 7. The actuator cartridge 5 is sealed by a corrugated pipe 8 against a fuel-carrying interior 9.

Das Kopplerelement 6 umfaßt einen Kopplerraum 10, welcher beispielsweise mit Silikonöl befüllt ist. Der Kopplerraum 10 ist ebenfalls über eine Wellrohrdichtung 11 abgedichtet. Das Wellrohr ist radial steif. Befüllt kann es daher axiale Kräfte abstützen. Weiterhin ist im Kopplerraum eine Kopplerfeder 12 angeordnet, welche dafür sorgt, daß ein Kopplerfuß 13 stets am Aktor 2 in Anlage gehalten wird.The coupler element 6 comprises a coupler space 10, which is filled, for example, with silicone oil. The coupler space 10 is also sealed by a corrugated tube seal 11. The corrugated tube is radially stiff. Filled, it can therefore support axial forces. Furthermore, a coupler spring 12 is arranged in the coupler space, which ensures that a coupler foot 13 is always held in contact with the actuator 2.

Ein Kopplerkopf 14 stützt sich an einer Schulter 15 an der Aktorpatrone 5 ab. In einer Ausnehmung 16 des Kopplerkopfes 14 ist ein Stift 17 angeordnet, welcher formschlüssig mit dem Aktorfuß 13 verbunden ist und in der Ausnehmung 16 geführt ist. Zwischen dem Stift 17 und der Wandung der Ausnehmung 16 ist ein Ringspalt 18 ausgebildet, welcher den Übergang von Hydraulikfluid in einen Ausgleichsraum 19 erlaubt. Dadurch sind langsame Volumenänderungen aufgrund von thermischen Prozessen im Koppler 6 möglich.A coupler head 14 is supported on a shoulder 15 on the actuator cartridge 5. In a recess 16 of the coupler head 14, a pin 17 is arranged, which is positively connected to the actuator base 13 and is guided in the recess 16. Between the pin 17 and the wall of the recess 16, an annular gap 18 is formed, which allows the transition of hydraulic fluid in a compensation chamber 19. As a result, slow volume changes due to thermal processes in the coupler 6 are possible.

Der Ausgleichsraum 19 ist durch eine Membran 20 abgeschlossen. In Fig. 1A ist die Membran 20 in einer ersten Stellung dargestellt, welche einen maximalen Ausgleichsraum 19 definiert. Fig. 1B stellt die Membran 20 in einer zweiten Stellung dar, welche einen minimalen Ausgleichsraum 19 definiert. Zusätzlich sind Zwischenstellungen möglich. Das Umklappen der Membran 20 aus der zweiten in die erste Stellung wird durch die Verdrängung des Hydraulikmediums in das Ausgleichsvolumen 19 erzielt, während das Zurückklappen in die Ausgangsstellung beispielsweise durch eine nur in Fig. 1B dargestellte Rückstellfeder 21 übernommen werden kann.The compensation chamber 19 is closed by a membrane 20. In Fig. 1A the diaphragm 20 is shown in a first position which defines a maximum compensation space 19. Fig. 1B represents the membrane 20 in a second position, which defines a minimum compensation space 19. In addition, intermediate positions are possible. The folding of the diaphragm 20 from the second to the first position is achieved by the displacement of the hydraulic medium in the compensating volume 19, while the folding back into the starting position, for example by a only in Fig. 1B shown return spring 21 can be adopted.

Durch die zwei Stellungen der Membran 20 kann sichergestellt werden, daß Temperaturänderungen des Aktors 2 ausgeglichen werden.The two positions of the membrane 20 can ensure that temperature changes of the actuator 2 are compensated.

Das erfindungsgemäß ausgestaltete Brennstoffeinspritzventil 1 weist weiterhin eine elektrische Leitung 22 zur Kontaktierung des Aktors 2 sowie ein Gehäuse 23 auf, in welchem der Koppler 6 und eine Ventilgruppe 24 angeordnet sind. Dabei umfaßt die Ventilgruppe 24 ein Stützelement 25, welches in Wirkverbindung mit einer Ventilnadel 26 steht. An der Ventilnadel 26 ist ein Ventilschließkörper 27 ausgebildet, welcher mit einer an dem Gehäuse 23 angeordneten Ventilsitzfläche 28 einen Dichtsitz bildet. Im Ausführungsbeispiel handelt es sich um ein nach außen öffnendes Brennstoffeinspritzventil 1. Zur Rückstellung der Ventilnadel 26 dient eine Rückstellfeder 29, welche zwischen dem Stützelement 25 und dem Gehäuse 23 eingespannt ist. Eine Dichtung 30 dichtet das Brennstoffeinspritzventil 1 gegen einen nicht weiter dargestellten Zylinderkopf der Brennkraftmaschine ab.The inventively designed fuel injector 1 further comprises an electrical line 22 for contacting the actuator 2 and a housing 23, in which the coupler 6 and a valve group 24 is arranged are. In this case, the valve group 24 includes a support member 25 which is in operative connection with a valve needle 26. At the valve needle 26, a valve closing body 27 is formed, which forms a sealing seat with a arranged on the housing 23 valve seat surface 28. In the exemplary embodiment is an outwardly opening fuel injector 1. To reset the valve needle 26 is a return spring 29, which is clamped between the support member 25 and the housing 23. A seal 30 seals the fuel injection valve 1 against a cylinder head, not shown, of the internal combustion engine.

Zur Montage des Kopplers 6 ist es vorteilhaft, diesen zu evakuieren, um eine einfache Montage des Gesamtbauteils zu ermöglichen und den Kopplerraum 10 anschließend über eine Bohrung 31, welche z. B. abschließend mit einer eingepreßten Kugel 32 verschlossen wird, zu befüllen.For mounting the coupler 6, it is advantageous to evacuate this to allow easy installation of the entire component and the coupler space 10 then via a bore 31, which z. B. is finally closed with a pressed ball 32 to fill.

Während der Kopplerraum 10 in Fig. 1A und 1B mit einer beliebigen Hydraulikflüssigkeit, welche lediglich die Anforderung erfüllt, bei schneller Druckentlastung nicht zu verdampfen, gefüllt ist, ist der Kopplerraum 10 in dem in Fig. 2 dargestellten zweiten Ausführungsbeispiel eines erfindungsgemäß ausgestalteten Brennstoffeinspritzventils 1 mit einer rheologischen Flüssigkeit gefüllt. Eine rheologische Flüssigkeit verhält sich bei langsamen, also z. B. thermischen Längenänderungen wie eine Flüssigkeit, bei schnellen Längenänderungen des Aktors 2, also z. B. bei Erregung desselben, wie ein Festkörper. Der Ausgleich der rheologischen Flüssigkeit über die Ausnehmung 16 reagiert sowohl genügend langsam bei thermischer Längenänderung als auch genügend steif bei Erregung des Aktors.While the coupler space 10 in Fig. 1A and 1B is filled with any hydraulic fluid, which only meets the requirement not to evaporate at rapid pressure relief, the coupler space 10 in the in Fig. 2 shown second embodiment of an inventively designed fuel injection valve 1 filled with a rheological fluid. A rheological fluid behaves at slow, so z. B. thermal length changes such as a liquid at rapid changes in length of the actuator 2, ie z. B. when excited the same as a solid. The compensation of the rheological fluid via the recess 16 reacts both slowly enough with thermal change in length as well as sufficiently stiff when the actuator is energized.

Claims (12)

  1. Fuel injection valve (1) for directly injecting fuel into a combustion chamber of an internal combustion engine, having an excitable actuator (2), having a valve needle (26), which is operatively connected to the actuator (2) and which is acted on in a closing direction by a restoring spring (29), for actuating a valve closing body (27) which, together with a valve seat face (28), forms a sealing seat, and having a hydraulic coupler (6), with the hydraulic coupler (6), which has a coupler base (13) and a coupler head (14), comprising a hydraulic volume (10) and a compensating space (19), with the compensating space (19) being variable in terms of its volume by means of a diaphragm (20),
    characterized
    in that a pin (17) is arranged in the coupler base (13) and
    in that the pin (17) extends into a recess (16) of the coupler head (14).
  2. Fuel injection valve according to Claim 1,
    characterized
    in that the diaphragm (20) can be flipped over between a first position and a second position.
  3. Fuel injection valve according to Claim 2,
    characterized
    in that the first position of the diaphragm (20) corresponds to a maximum compensating space (19).
  4. Fuel injection valve according to Claim 2 or 3,
    characterized
    in that the second position of the diaphragm (20) corresponds to a minimum compensating space (19).
  5. Fuel injection valve according to one of Claims 2 to 4,
    characterized
    in that the diaphragm (20) can be flipped over, and can be adjusted in a continuously variable fashion, between the first and the second position by means of a hydraulic medium present in the hydraulic volume (10).
  6. Fuel injection valve according to Claim 5,
    characterized
    in that silicone oil is provided as hydraulic medium.
  7. Fuel injection valve according to Claim 1,
    characterized
    in that the pin (17) is guided in the recess (16) so as to form an annular gap (18).
  8. Fuel injection valve according to one of Claims 1 to 7,
    characterized
    in that the coupler base (13) and the coupler head (14) are spaced apart from one another by a spring (12).
  9. Fuel injection valve according to one of Claims 1 to 8,
    characterized
    in that the hydraulic volume (10) is sealed off by means of a corrugated tube seal (11).
  10. Fuel injection valve according to one of Claims 1 to 9,
    characterized
    in that a bore (31) for the filling of the hydraulic volume (10) is provided in the coupler base (13).
  11. Fuel injection valve according to Claim 10,
    characterized
    in that the bore (31) can, after the filling of the hydraulic volume (10), be closed off by means of a ball (32) which is preferably pressed in.
  12. Fuel injection valve according to one of Claims 1 to 11,
    characterized
    in that the hydraulic volume (10) contains a rheological liquid.
EP03025329A 2003-02-24 2003-11-04 Fuel injector Expired - Lifetime EP1450034B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10307816 2003-02-24
DE10307816A DE10307816A1 (en) 2003-02-24 2003-02-24 Fuel injector

Publications (2)

Publication Number Publication Date
EP1450034A1 EP1450034A1 (en) 2004-08-25
EP1450034B1 true EP1450034B1 (en) 2008-04-09

Family

ID=32731122

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03025329A Expired - Lifetime EP1450034B1 (en) 2003-02-24 2003-11-04 Fuel injector

Country Status (3)

Country Link
EP (1) EP1450034B1 (en)
AT (1) ATE391850T1 (en)
DE (2) DE10307816A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2141347A1 (en) * 2008-07-03 2010-01-06 Continental Automotive GmbH Thermal compensation arrangement

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4306072C2 (en) * 1993-02-26 1994-12-08 Siemens Ag Device for opening and closing a passage opening in a housing
DE19708304C2 (en) * 1997-02-28 1999-09-30 Siemens Ag Movement transmission device and injection valve with a movement transmission device
DE19744235A1 (en) * 1997-10-07 1999-04-08 Fev Motorentech Gmbh & Co Kg Fuel injection nozzle for IC engine
DE19919313B4 (en) * 1999-04-28 2013-12-12 Robert Bosch Gmbh Fuel injector
DE19940056A1 (en) * 1999-08-24 2001-03-22 Siemens Ag Dosing device and method for dosing
DE19940054C2 (en) * 1999-08-24 2003-11-27 Siemens Ag Dosing valve for a pressurized fluid
DE10044120A1 (en) * 2000-09-07 2002-04-04 Bosch Gmbh Robert Common Rail System
DE60125207T2 (en) * 2000-10-11 2007-10-25 Siemens Vdo Automotive Corp., Auburn Hills COMPENSATING DEVICE WITH A PRESSURE VALVE FOR A SOLID BODY ACTUATOR OF A FUEL INJECTION VALVE
DE10140799A1 (en) * 2001-08-20 2003-03-06 Bosch Gmbh Robert Fuel injector
DE10230089A1 (en) * 2002-07-04 2004-01-15 Robert Bosch Gmbh Fuel injector

Also Published As

Publication number Publication date
DE50309573D1 (en) 2008-05-21
DE10307816A1 (en) 2004-09-02
ATE391850T1 (en) 2008-04-15
EP1450034A1 (en) 2004-08-25

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