EP2596229B1 - Fuel injection valve having a dry magnetic actuator - Google Patents

Fuel injection valve having a dry magnetic actuator Download PDF

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Publication number
EP2596229B1
EP2596229B1 EP11726081.0A EP11726081A EP2596229B1 EP 2596229 B1 EP2596229 B1 EP 2596229B1 EP 11726081 A EP11726081 A EP 11726081A EP 2596229 B1 EP2596229 B1 EP 2596229B1
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Prior art keywords
valve
fuel injection
fuel
needle
armature
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EP11726081.0A
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German (de)
French (fr)
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EP2596229A1 (en
Inventor
Udo Diehl
Rainer Walter
Ralph Engelberg
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Robert Bosch GmbH
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Robert Bosch GmbH
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M51/00Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/061Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
    • F02M51/0625Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
    • F02M51/0635Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/04Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
    • F02M61/08Fuel-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
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/16Sealing of fuel injection apparatus not otherwise provided for

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

Description

Stand der TechnikState of the art

Die vorliegende Erfindung betrifft ein Kraftstoffeinspritzventil mit einem trockenen Magnetaktor ohne Leckagerücklauf.The present invention relates to a fuel injection valve with a dry solenoid actuator without leakage return.

Kraftstoffeinspritzventile sind aus dem Stand der Technik in unterschiedlichen Ausgestaltungen bekannt. Beispielsweise werden in jüngster Zeit verstärkt nach außen öffnende Einspritzventile verwendet, welche mittels eines Piezoaktors betätigt werden. Diese können zwar schnelle Schaltzeiten realisieren, sind jedoch sehr teuer und aufwendig in der Herstellung ( EP-A-1 046 809 ).Fuel injection valves are known from the prior art in various configurations. For example, recently opened outwardly opening injectors are used, which are actuated by means of a piezoelectric actuator. Although these can realize fast switching times, they are very expensive and expensive to manufacture ( EP-A-1 046 809 ).

Ferner ist aus der US 2007/0095955 A1 ein Einspritzventil bekannt, welches eine Anordnung des Magnetaktors im Kraftstoffpfad offenbart. Neben der Korrosionsproblematik durch den Kraftstoff, insbesondere im Aktorbereich, ergeben sich hierbei Dynamikverluste aufgrund der für den Stellvorgang notwendigen Verdrängung des Kraftstoffs. Es wäre daher wünschenswert, ein möglich einfach aufgebautes oder kostengünstiges sowie schnell schaltendes Ventil für eine Kraftstoffeinspritzung bereitzustellen.Furthermore, from the US 2007/0095955 A1 an injection valve is known, which discloses an arrangement of the magnetic actuator in the fuel path. In addition to the problem of corrosion by the fuel, especially in Aktorbereich, this dynamic losses arise due to the necessary for the adjustment displacement of the fuel. It would therefore be desirable to provide a potentially simple or low cost and fast switching fuel injection valve.

Offenbarung der ErfindungDisclosure of the invention

Das erfindungsgemäße Kraftstoffeinspritzventil mit den Merkmalen des Anspruchs 1 weist demgegenüber den Vorteil auf, dass ein Magnetaktor vollständig vom Kraftstoffpfad getrennt ist, so dass der Magnetaktor in einem trockenen Bereich des Kraftstoffeinspritzventils angeordnet ist. Hierdurch ergeben sich insbesondere geringere Anforderungen an Lagetoleranzen zwischen dem Magnetaktor und dem Kraftstoffteil des Ventils. Darüber hinaus können spezielle, weichmagnetische Werkstoffe für die Bauteile des Magnetaktors verwendet werden, da die Korrosionsproblematik des Kraftstoffs am Magnetaktor entfällt. Ferner weist das erfindungsgemäße Kraftstoffeinspritzventil einen sehr einfachen und kostengünstigen Aufbau auf, so dass es besonders als Massenbauteil geeignet ist. Die erfindungsgemäßen Vorteile werden durch ein Kraftstoffeinspritzventil erhalten, welches einen Ventilkörper, eine Ventilnadel und einen Magnetaktor mit einem Magnetanker umfasst. Ferner ist eine Schließfeder vorgesehen, welche an der Ventilnadel angreift und die Ventilnadel in den geschlossenen Zustand zurückführt. Das Kraftstoffeinspritzventil ist als nach außen öffnendes Ventil ausgebildet und umfasst ferner ein Dichtelement, welches den Magnetaktor vom Kraftstoffpfad trennt, so dass der Magnetaktor im kraftstofffreien Bereich des Ventilkörpers angeordnet ist. Ferner ist eine Gegenfeder vorgesehen, welche mit einem Magnetanker in Kontakt ist. Dabei sind der Magnetanker und die Ventilnadel als separate Bauteile ausgebildet, welche sich jedoch miteinander in lösbarem Kontakt befinden. Mit anderen Worten ist an einer Trennstelle zwischen dem Magnetanker und der Ventilnadel ein Kontakt vorgesehen, an dem beide Bauteile aneinander liegen, wobei die Gegenfeder den Magnetanker gegen die Ventilnadel vorspannt. Eine Kraft der Schließfeder ist dabei größer als eine Kraft der Gegenfeder. Durch die erfindungsgemäße Trennung zwischen der Ventilnadel und dem Magnetanker kann ferner eine Prellerreduzierung, d.h., eine Reduzierung von einem Anschlagen von Bauteilen gegeneinander, reduziert werden. Ein Dichtelement trennt den Magnetaktor vom Kraftstoffpfad. Ferner ergibt sich durch die Trennung der Ventilnadel von dem Magnetanker eine Massereduktion, so dass bei einem Schließvorgang der Ventilnadel, wenn diese den Ventilsitz erreicht und den Durchlass verschließt, weniger Verschleiß am Ventilsitz entsteht. Der lose an der Ventilnadel angeordnete Magnetanker kann dabei entgegen der Wirkung der Gegenfeder durchschwingen, wodurch insgesamt eine reduzierte Prellerneigung erhalten wird.In contrast, the fuel injection valve according to the invention with the features of claim 1 has the advantage that a magnetic actuator is completely separated from the fuel path, so that the magnetic actuator is arranged in a dry region of the fuel injection valve. This results in particular lower demands on position tolerances between the solenoid actuator and the fuel part of the valve. In addition, special, soft magnetic materials for the components of the Magnetaktors be used because the corrosion problem of the fuel is eliminated at the magnetic actuator. Furthermore, the fuel injection valve according to the invention has a very simple and inexpensive construction, so that it is particularly suitable as a mass component. The advantages according to the invention are obtained by a fuel injection valve which comprises a valve body, a valve needle and a magnetic actuator with a magnet armature. Further, a closing spring is provided, which acts on the valve needle and returns the valve needle in the closed state. The fuel injection valve is designed as an outwardly opening valve and further comprises a sealing element, which separates the magnetic actuator from the fuel path, so that the magnetic actuator is arranged in the fuel-free region of the valve body. Further, a counter spring is provided, which is in contact with a magnet armature. In this case, the armature and the valve needle are formed as separate components, which, however, are in releasable contact with each other. In other words, a contact is provided at a separation point between the armature and the valve needle, on which both components abut each other, wherein the opposing spring biases the armature against the valve needle. A force of the closing spring is greater than a force of the opposing spring. The inventive separation between the valve needle and the armature can also reduce bounce, ie, a reduction of an abutment of components against each other, can be reduced. A sealing element separates the magnetic actuator from the fuel path. Furthermore, results from the separation of the valve needle from the armature a mass reduction, so that during a closing operation of the valve needle, when it reaches the valve seat and closes the passage, less wear occurs on the valve seat. The loosely arranged on the valve needle armature can swing through against the action of the opposing spring, whereby a total of a reduced bounce is obtained.

Die Unteransprüche zeigen bevorzugte Weiterbildungen der Erfindung.The dependent claims show preferred developments of the invention.

Vorzugsweise ist das Dichtelement ein Balg, welcher am Ventilkörper und der Ventilnadel befestigt ist. Der Balg kann ein Metallbalg sein und mittels einer Schweißverbindung am Ventilkörper bzw. der Ventilnadel befestigt werden, so dass eine absolut dichte Abdichtung vom Kraftstoffpfad erfolgt. Durch diese absolut dichte Abdichtung ist es auch nicht notwendig, dass ein Leckagepfad o.ä. am kraftstofffreien Bereich des Ventilkörpers vorgesehen wird.Preferably, the sealing element is a bellows, which is attached to the valve body and the valve needle. The bellows may be a metal bellows and be attached by a welded connection to the valve body or the valve needle, so that an absolutely tight seal from the fuel path. Through this Absolutely tight seal, it is also not necessary that a leak path o.ä. is provided at the fuel-free area of the valve body.

Weiter bevorzugt weist der Magnetanker einen nadelartigen Bereich auf, welcher in einem Magnettopf geführt ist. Hierdurch weist der Magnettopf neben seiner eigentlichen Funktion noch eine Führungsfunktion auf, so dass neben einer sicheren Führung weiterhin die Anzahl von Bauteilen reduziert werden kann. Da die Toleranzkette der Führung des Magnetaktors nur über Magnetanker und Magnettopf bestimmt ist, kann eine Entfeinerung der Fertigungstoleranzen ermöglicht werden.More preferably, the armature on a needle-like portion, which is guided in a magnet pot. As a result, the magnetic pot in addition to its actual function on a leadership function, so that in addition to a secure leadership continue the number of components can be reduced. Since the tolerance chain of the guide of the magnetic actuator is determined only by magnetic armature and magnet pot, a refinement of the manufacturing tolerances can be made possible.

Weiter bevorzugt sind der Magnetanker und der Magnettopf aus einem weichmagnetischen Material hergestellt, wodurch die Herstellungskosten signifikant reduziert werden können, da kein gegen den Kraftstoff korrosionsbeständiges Material verwendet werden muss.More preferably, the armature and the magnetic pot are made of a soft magnetic material, whereby the manufacturing cost can be significantly reduced because no fuel corrosion resistant material must be used.

Erfindungsgemäß ist der Magnetaktor eine vormontierbare Baugruppe, welche lediglich in das Kraftstoffeinspritzventil eingefügt werden muss. Hierdurch ist ein getrenntes Testen der Magnetgruppe sowie auch des Kraftstoffteils des Kraftstoffeinspritzventils möglich. Hierdurch können die einzelnen Baugruppen schon vor einer Endmontage überprüft werden und gegebenenfalls aussortiert werden.According to the invention, the magnetic actuator is a preassemblable subassembly which merely has to be inserted into the fuel injection valve. As a result, a separate testing of the magnet group as well as the fuel part of the fuel injection valve is possible. As a result, the individual modules can be checked before final assembly and optionally sorted out.

Besonders bevorzugt ist der Magnetanker ein Flachanker. Da der Flachanker im trockenen, d.h., im kraftstofffreien, Bereich angeordnet ist, ergibt sich ein großes Potential hinsichtlich eines hochdynamischen Betriebs des Kraftstoffeinspritzventils. Hierdurch können schnelle Schaltzeiten des Ventils realisiert werden, ohne dass ein Piezoelement als Aktor notwendig ist.The magnet armature is particularly preferably a flat armature. Since the flat armature is disposed in the dry, that is, in the fuel-free, region, there is great potential for highly dynamic operation of the fuel injection valve. As a result, fast switching times of the valve can be realized without a piezoelectric element is necessary as an actuator.

Weiter bevorzugt weist der Balg und der Ventilsitz den gleichen oder einen im Wesentlichen gleichen hydraulisch wirksamen Durchmesser auf. Hierdurch wirken keine oder nur sehr geringe axiale Druckkräfte, was geringere Anforderungen an die aufzubringenden Betätigungskräfte der Schließfeder und des Magneten nach sich zieht. Bei gegebenem Bauraum kann dabei eine Dynamiksteigerung des Ventils erreicht werden.More preferably, the bellows and the valve seat on the same or a substantially same hydraulically effective diameter. As a result, no or only very small axial compressive forces, which entails lower demands on the applied actuating forces of the closing spring and the magnet by itself. For a given space can thereby be achieved an increase in dynamics of the valve.

Zeichnungdrawing

Nachfolgend wird ein bevorzugtes Ausführungsbeispiel der Erfindung unter Bezugnahme auf die begleitende Zeichnung im Detail beschrieben. In der Zeichnung ist:

Figur 1
eine schematische Schnittansicht eines Kraftstoffeinspritzventils gemäß einem Ausführungsbeispiel der Erfindung.
Hereinafter, a preferred embodiment of the invention will be described in detail with reference to the accompanying drawings. In the drawing is:
FIG. 1
a schematic sectional view of a fuel injection valve according to an embodiment of the invention.

Bevorzugte Ausführungsform der ErfindungPreferred embodiment of the invention

Nachfolgend wird unter Bezugnahme auf Figur 1 ein Kraftstoffeinspritzventil 1 gemäß einem bevorzugten Ausführungsbeispiel der Erfindung im Detail beschrieben.The following is with reference to FIG. 1 a fuel injection valve 1 according to a preferred embodiment of the invention described in detail.

Das Kraftstoffeinspritzventil 1 ist ein nach außen öffnendes Ventil, wobei Figur 1 den geschlossenen Zustand des Ventils zeigt. Das erfindungsgemäße Kraftstoffeinspritzventil 1 wird beispielsweise zur Hochdruck-Direkteinspritzung für Verbrennungsmotoren im Schichtladebetrieb verwendet.The fuel injection valve 1 is an outwardly opening valve, wherein FIG. 1 shows the closed state of the valve. The fuel injection valve 1 according to the invention is used, for example, for high-pressure direct injection for internal combustion engines in the stratified charge mode.

Wie aus Figur 1 ersichtlich ist, umfasst das Kraftstoffeinspritzventil 1 einen Ventilkörper 2, in welchem ein Kraftstoffpfad 3 zur Zuführung von unter hohem Druck stehenden Kraftstoff ausgebildet ist. An einem Ende des Ventilkörpers 2 ist ein Durchlass 6 ausgebildet, welcher mittels einer nach außen öffnenden Ventilnadel 4 freigebbar bzw. verschließbar ist. Die Ventilnadel 4 schließt den Durchlass 6 dabei an einem Ventilsitz 5 ab.How out FIG. 1 As can be seen, the fuel injection valve 1 comprises a valve body 2, in which a fuel path 3 for supplying high-pressure fuel is formed. At one end of the valve body 2, a passage 6 is formed, which can be opened or closed by means of an outwardly opening valve needle 4. The valve needle 4 closes off the passage 6 at a valve seat 5.

Die Ventilnadel 4 umfasst an einem vom Ventilsitz 5 abgewandten Ende ein scheibenförmiges Element 15, an welchem eine Schließfeder 11 anliegt. Die Schließfeder 11 stützt sich einerseits am Scheibenelement 15 und andererseits am Ventilkörper 2 ab und bringt die Ventilnadel 4 in den in Figur 1 geschlossenen Zustand. Das Kraftstoffeinspritzventil 1 umfasst ferner ein Dichtelement 13 in Form eines Balges, welches den Kraftstoffpfad 3 von einem kraftstofffreien Raum 17 trennt. Der Balg ermöglicht eine hermetische Abdichtung des kraftstofffreien Raums gegenüber dem Kraftstoffpfad 3. Wie aus Figur 1 ersichtlich ist, ist die Schließfeder 11 sowie ein Magnetaktor 7 im kraftstofffreien Raum 17 angeordnet. Der Balg weist ferner einen hydraulisch wirksamen Querschnitt auf, welcher einem hydraulisch wirksamen Querschnitt des Ventilsitzes 5 entspricht. Hierdurch wirken auf die Ventilnadel 4 keine oder nur geringe axiale Druckkräfte (aufgrund der Flächengleichheit). Dies führt wiederum zu geringeren Anforderungen an die aufzubringenden Betätigungskräfte, wobei eine bei gegebenem Bauraum erzielbare Kraft zu einer Dynamiksteigerung des Ventils führt.The valve needle 4 comprises, at an end remote from the valve seat 5, a disk-shaped element 15 against which a closing spring 11 rests. The closing spring 11 is supported on the one hand on the disc element 15 and on the other hand on the valve body 2 and brings the valve needle 4 in the in FIG. 1 closed state. The fuel injection valve 1 further comprises a sealing element 13 in the form of a bellows, which separates the fuel path 3 from a fuel-free space 17. The bellows allow a hermetic seal of the fuel-free space relative to the fuel path 3. As out FIG. 1 is apparent, is the Closing spring 11 and a magnetic actuator 7 arranged in the fuel-free space 17. The bellows also has a hydraulically effective cross section, which corresponds to a hydraulically effective cross section of the valve seat 5. As a result, act on the valve needle 4 no or only small axial compressive forces (due to the surface equality). This in turn leads to lower demands on the actuation forces to be applied, wherein a force achievable with a given space leads to an increase in the dynamics of the valve.

Der Magnetaktor 7 umfasst einen Magnetanker 8 in Form eines Flachankers, einen Magnettopf 9 und eine Spule 10. Ferner ist eine Gegenfeder 12 vorgesehen, welche den Magnetanker 8 mit einer Kraft F2 vorspannt. Die Gegenfeder 12 stützt sich dabei an einem Stützelement 16, welches im Ventilkörper 2 fixiert ist, ab. Der Magnetanker 8 umfasst einen scheibenförmigen Bereich 8a sowie einen nadelförmigen Bereich 8b. Der nadelförmige Bereich 8b berührt ein Ende der Ventilnadel 4 an einer Trennstelle 14 zwischen der Ventilnadel 4 und dem Magnetanker 8. Dabei wird der Magnetanker 8 im Magnettopf 9 mittels des nadelförmigen Bereichs 8b geführt.The magnetic actuator 7 comprises a magnet armature 8 in the form of a flat armature, a magnet pot 9 and a coil 10. Further, a counter-spring 12 is provided, which biases the magnet armature 8 with a force F2. The opposing spring 12 is supported on a support element 16, which is fixed in the valve body 2 from. The magnet armature 8 comprises a disk-shaped region 8a and a needle-shaped region 8b. The needle-shaped portion 8b contacts one end of the valve needle 4 at a separation point 14 between the valve needle 4 and the magnet armature 8. In this case, the magnet armature 8 is guided in the magnetic pot 9 by means of the needle-shaped portion 8b.

Aus dem nur axial belasteten Aufeinanderliegen zwischen dem nadelförmigen Bereich 8b und der Ventilnadel 4 an der Trennstelle 14 resultieren geringere fertigungstechnische Anforderungen, so dass ein kleiner radialer Versatz und geringe Winkelfehler zulässig sind. Hierdurch können die Herstellungskosten signifikant reduziert werden. Auch dürfen zwischen der Führung der Ventilnadel 4 und der Führung des Magnetankers 8 in gewissen Grenzen radiale Abweichungen und Winkelfehler auftreten, da die Führungen voneinander entkoppelt sind und nicht überbestimmt sind.From the only axially loaded superimposition between the needle-shaped portion 8b and the valve needle 4 at the separation point 14 result in lower manufacturing requirements, so that a small radial offset and small angular errors are allowed. As a result, the production costs can be significantly reduced. Also, between the leadership of the valve needle 4 and the guide of the armature 8 within certain limits radial deviations and angular errors occur because the guides are decoupled from each other and are not overdetermined.

Die Schließfeder 11 stellt eine Schließkraft F1 bereit, welche in axialer Richtung X-X des Kraftstoffeinspritzventils in Richtung des Magnetaktors 7 wirkt. Die Gegenfeder 12 stellt eine Vorspannkraft F2 bereit, welche entgegen der Kraft F1 der Schließfeder 11 wirkt. Dabei ist die Kraft F1 der Schließfeder größer als die Kraft F2 der Gegenfeder.The closing spring 11 provides a closing force F1 which acts in the axial direction X-X of the fuel injection valve in the direction of the magnetic actuator 7. The opposing spring 12 provides a biasing force F2, which counteracts the force F1 of the closing spring 11. The force F1 of the closing spring is greater than the force F2 of the opposing spring.

Die Funktion des erfindungsgemäßen Kraftstoffeinspritzventils 1 ist dabei wie folgt: Wenn ein Einspritzvorgang ausgeführt werden soll, wird die Spule 10 bestromt, so dass der Magnetanker 8 in Richtung des Magnettopfes 9 angezogen wird. Hierbei ist die auf den Magnetanker 8 wirkende Kraft aus der Summe der magnetischen Kraft sowie der Kraft F2 der Gegenfeder 12 größer als die Kraft der Schließfeder F1, so dass die Ventilnadel 4, welche sich aufgrund der in Richtung des Magnetaktors 7 wirkenden Kraft F1 der Schließfeder F in direktem Kontakt mit dem nadelförmigen Bereich 8b des Magnetankers 8 befindet, in Öffnungsrichtung gedrückt. Kraftstoff, welcher wie in Figur 1 durch den Pfeil A angedeutet, unter hohem Druck in den Kraftstoffpfad 3 zugeführt wird, kann dann an den freigegebenen Durchlass 6 eingespritzt werden.The function of the fuel injection valve 1 according to the invention is as follows: When an injection process is to be carried out, the coil 10 energized, so that the magnet armature 8 is attracted in the direction of the magnet pot 9. Here, the force acting on the magnet armature 8 from the sum of the magnetic force and the force F2 of the opposing spring 12 is greater than the force of the closing spring F1, so that the valve needle 4, which is due to acting in the direction of the magnetic actuator 7 force F1 of the closing spring F is in direct contact with the needle-shaped portion 8b of the magnet armature 8, pressed in the opening direction. Fuel, which as in FIG. 1 indicated by the arrow A, is supplied under high pressure in the fuel path 3, can then be injected to the released passage 6.

Wenn die Einspritzung beendet werden soll, wird die Bestromung der Spule 10 unterbrochen. Dadurch entfällt die auf den Magnetanker 8 wirkende magnetische Kraft, so dass nun die Kraft F1 der Schließfeder 11, welche größer als die Kraft F2 der Gegenfeder 12 ist, die Ventilnadel 4 sowie den Magnetanker 8 wieder in die in Figur 1 gezeigte Ausgangsposition zurückstellen kann. Der abdichtende Balg, welcher einerseits am Ventilkörper 2 und andererseits an der Ventilnadel 4 fluiddicht befestigt ist, ermöglicht dabei die Bewegung der Ventilnadel 4.When the injection is to be ended, the energization of the coil 10 is interrupted. This eliminates the force acting on the armature 8 magnetic force, so that now the force F1 of the closing spring 11, which is greater than the force F2 of the opposing spring 12, the valve needle 4 and the armature 8 back into the in FIG. 1 can reset shown starting position. The sealing bellows, which is fastened on the one hand to the valve body 2 and on the other hand to the valve needle 4 fluid-tight, thereby allowing the movement of the valve needle. 4

Erfindungsgemäß sind somit die Ventilnadel 4 und der Magnetanker 8 zwei separate Bauteile, welche sich miteinander in lösbarem Kontakt befinden. Bei Beendigung der Einspritzung kann dabei der Magnetanker 8 gegen die Wirkrichtung der Gegenfeder 12 durchschwingen. Dies führt zu einer Reduzierung der im Ventilsitz 5 abgebremsten bewegten Masse, wodurch ein geringerer Verschleiß am Ventilsitz 5 bzw. an der Ventilnadel 4 erhalten wird. Ferner ist der Magnetaktor 7 im trockenen Bereich des Kraftstoffeinspritzventils 1 angeordnet, so dass keine teuren Materialien für den Magnetkreis verwendet werden müssen, welche sonst bei einer nassen Ausführung, d.h., bei einem Kontakt mit Kraftstoff, erforderlich sind. Ferner wird der Magnetanker 8 durch die Kraft F2 der Gegenfeder 12 an der Trennstelle 14 ansonsten immer in direktem Kontakt mit der Ventilnadel 4 gehalten.According to the invention thus the valve needle 4 and the armature 8 are two separate components, which are in releasable contact with each other. When the injection is completed, the magnet armature 8 can swing against the effective direction of the opposing spring 12. This leads to a reduction of the moving mass braked in the valve seat 5, as a result of which less wear is obtained on the valve seat 5 or on the valve needle 4. Further, the solenoid actuator 7 is disposed in the dry area of the fuel injection valve 1, so that there is no need to use expensive materials for the magnetic circuit, which are otherwise required in a wet type, that is, in contact with fuel. Further, the magnet armature 8 is held by the force F2 of the opposing spring 12 at the separation point 14 otherwise always in direct contact with the valve needle 4.

Der erfindungsgemäße Aufbau ermöglicht ferner geringere Anforderungen an Lagetoleranzen zwischen dem Magnetaktor 7 und der Ventilnadel 4. Weiter kann durch die Verwendung des Balges eine absolut sichere Trennung des kraftstofffreien Raums 17 vom Kraftstoff erfolgen. Ferner kann der trockene Flachankermagnetkreis einen hochdynamischen Betrieb des Ventils ermöglichen. Dabei sind die Toleranzen für den Magnetkreis auf nur wenige Bauteile verteilt, so dass reduzierte Toleranzanforderungen für die Bauteile möglich sind und somit eine kostengünstigere Herstellung möglich ist. Im Öffnungsfall des Ventils kann in Längsrichtung die Bauteilekombination von Ventilnadel 4 und Magnetanker 8 als starr angesehen werden. In Querrichtung kann bei der Montage ein geringerer Versatz oder ein geringerer Winkelfehler zugelassen werden, was sich ebenfalls positiv auf die Toleranzanforderung der Bauteile auswirkt. Ferner können der die Ventilnadel 4, das Gehäuse, den Ventilsitz und den Balg umfassende Hydraulikteil und der Magnetaktor unabhängig voneinander geprüft werden. Dies führt zu geringerem Ausschuss und der Möglichkeit, geeignete Hydraulikteile und Magnetaktoren einander zuzupaaren bzw. ungünstige Kombinationen zu vermeiden, so dass insgesamt weniger fehlerhafte Ventile montiert werden.Furthermore, the structure according to the invention makes it possible to impose less stringent tolerances between the magnet actuator 7 and the valve needle 4. Furthermore, the use of the bellows allows an absolutely secure separation of the fuel-free space 17 from the fuel. Furthermore, the dry flat armature magnetic circuit can be a highly dynamic operation of the valve enable. The tolerances for the magnetic circuit are distributed to only a few components, so that reduced tolerance requirements for the components are possible and thus a more cost-effective production is possible. In the opening case of the valve, the component combination of valve needle 4 and armature 8 can be regarded as rigid in the longitudinal direction. In the transverse direction during assembly a smaller offset or a smaller angle error can be allowed, which also has a positive effect on the tolerance requirement of the components. Further, the hydraulic part comprising the valve needle 4, the housing, the valve seat and the bellows, and the solenoid actuator can be independently checked. This leads to less rejects and the possibility of matching suitable hydraulic parts and magnetic actuators with each other or of avoiding unfavorable combinations, so that altogether fewer faulty valves are mounted.

Die Trennung von Ventilnadel 4 und Magnetanker 8 ermöglicht beim Öffnen des Ventils ebenfalls ein Überschwingen der Ventilnadel, welche sich vom Magnetanker 8 lösen kann. Da beim Schließen des Ventils der Magnetanker 8 in entgegengesetzte Richtung überschwingen kann, ergibt sich eine signifikant reduzierte Prellneigung der Ventilnadel 4 im Ventilsitz 5.The separation of valve needle 4 and armature 8 also allows the valve opening to overshoot the valve needle, which can come loose from the armature 8 when opening the valve. Since the magnetic armature 8 can overshoot in the opposite direction when closing the valve, a significantly reduced bounce of the valve needle 4 in the valve seat 5 results.

Das erfindungsgemäße Kraftstoffeinspritzventil wird insbesondere bei einer geschichteten Benzindirekteinspritzung verwendet. Ein weiterer Vorteil im homogenen Betrieb ist eine bessere Zerstäubung des Kraftstoffs gegenüber Mehrlochventilen und die damit verbundene geringere Partikelbildung. Hierdurch kann ermöglicht werden, dass auch in Zukunft noch weiter verschärfte Abgasnormen ohne Partikelfilter erreicht werden, so dass auf derartige Partikelfilter verzichtet werden kann.The fuel injection valve according to the invention is used in particular in a stratified gasoline direct injection. Another advantage in homogeneous operation is a better atomization of the fuel compared to multi-hole valves and the associated lower particle formation. This makes it possible to achieve even more stringent emission standards without particle filters in the future, so that such particle filters can be dispensed with.

Claims (6)

  1. Fuel injection valve, comprising:
    - a valve body (2) in which a fuel path (3) runs,
    - an outwardly opening valve needle (4) which opens up and closes off a passage (6) at a valve seat (5),
    - a closing spring (11) which returns the valve needle (4) into a closed valve state,
    characterized by
    - a magnetic actuator (7) with a magnet armature (8), a magnet pot (9) and a coil (10),
    - a sealing element (13) which separates the magnetic actuator (7) from the fuel path (3), such that the magnetic actuator (7) is arranged in a fuel-free region (17) of the valve body (2),
    - and an opposing spring (12) which is in contact with and exerts a preload on the magnet armature (8), wherein the magnet armature (8) and the valve needle (4) are separate components which bear directly against one another, and are in contact, at a parting point (14),
    - wherein the opposing spring (12) preloads the magnet armature (8) against the valve needle (4),
    - wherein a force (F1) of the closing spring (11) acts counter to a force (F2) of the opposing spring (12), wherein the force (F1) of the closing spring (11) is greater than the force (F2) of the opposing spring (12), and
    - the magnetic actuator (7) is a pre-assemblable assembly which is inserted into the valve body (2).
  2. Fuel injection valve according to Claim 1, characterized in that the sealing element (13) is a bellows which is fastened in hermetically sealing fashion to the valve body (2) and to the valve needle (4).
  3. Fuel injection valve according to one of the preceding claims, characterized in that the magnet armature (8) has a needle-like region (8b) which is guided in a magnet pot (9) of the magnetic actuator (7).
  4. Fuel injection valve according to Claim 3, characterized in that the magnet armature (8) is produced from a soft-magnetic material.
  5. Fuel injection valve according to one of the preceding claims, characterized in that the magnet armature (8) is a flat armature.
  6. Fuel injection valve according to one of Claims 2 to 5, characterized in that the bellows has the same effective hydraulic diameter as the valve seat (5), or the hydraulic diameter of bellows and valve seat (5) differ from one another only to a small extent.
EP11726081.0A 2010-07-22 2011-05-27 Fuel injection valve having a dry magnetic actuator Active EP2596229B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010031643A DE102010031643A1 (en) 2010-07-22 2010-07-22 Fuel injector with dry solenoid actuator
PCT/EP2011/058773 WO2012010357A1 (en) 2010-07-22 2011-05-27 Fuel injection valve having a dry magnetic actuator

Publications (2)

Publication Number Publication Date
EP2596229A1 EP2596229A1 (en) 2013-05-29
EP2596229B1 true EP2596229B1 (en) 2015-11-04

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Application Number Title Priority Date Filing Date
EP11726081.0A Active EP2596229B1 (en) 2010-07-22 2011-05-27 Fuel injection valve having a dry magnetic actuator

Country Status (7)

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EP (1) EP2596229B1 (en)
JP (1) JP2013532787A (en)
KR (1) KR20130094291A (en)
CN (1) CN103026045B (en)
BR (1) BR112013001269A2 (en)
DE (1) DE102010031643A1 (en)
WO (1) WO2012010357A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2947306A1 (en) 2014-05-22 2015-11-25 Continental Automotive GmbH Injector for injecting fluid

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59131572U (en) * 1983-02-22 1984-09-04 日産自動車株式会社 fuel injection valve device
US4783009A (en) * 1987-04-27 1988-11-08 Brunswick Corporation Calibration adjustment of electromagnetic fuel injectors
DE19638025A1 (en) * 1996-09-18 1998-03-19 Bosch Gmbh Robert Fuel injector with integrated spark plug
DE19719268A1 (en) * 1997-05-07 1998-11-12 Siegfried Dr Foerster Electromagnetic fuel injection valve operating method for IC engine
EP1046809B1 (en) * 1999-04-20 2005-08-10 Siemens Aktiengesellschaft Fluid metering device
DE19960341A1 (en) * 1999-12-15 2001-06-21 Bosch Gmbh Robert Fuel injector
DE10039424A1 (en) * 2000-08-11 2002-02-28 Siemens Ag Dosing valve with a hydraulic transmission element
DE10149915A1 (en) * 2001-10-10 2003-04-24 Bosch Gmbh Robert Fuel injection valve for IC engine fuel injection system has piezoelectric or magnetistrictive actuator enclosed by thermal expansion compensation sleeve
JP4062221B2 (en) * 2003-09-17 2008-03-19 株式会社デンソー Electromagnetic actuator, method for manufacturing electromagnetic actuator, and fuel injection valve
ATE377148T1 (en) 2005-11-02 2007-11-15 Delphi Tech Inc FUEL INJECTION VALVE
DE102007008901B4 (en) * 2007-02-23 2008-10-16 Compact Dynamics Gmbh Fluid injection valve
JP4835571B2 (en) * 2007-10-11 2011-12-14 株式会社デンソー solenoid valve
JP5009263B2 (en) * 2008-10-20 2012-08-22 本田技研工業株式会社 Fuel injection device
DE102009002840A1 (en) * 2009-05-06 2010-11-11 Robert Bosch Gmbh Device for injecting fuel

Also Published As

Publication number Publication date
CN103026045B (en) 2016-01-27
EP2596229A1 (en) 2013-05-29
JP2013532787A (en) 2013-08-19
DE102010031643A1 (en) 2012-01-26
KR20130094291A (en) 2013-08-23
BR112013001269A2 (en) 2016-05-17
WO2012010357A1 (en) 2012-01-26
CN103026045A (en) 2013-04-03

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