EP2917556B1 - Fuel injection valve and fuel injection system with a fuel injection valve - Google Patents

Fuel injection valve and fuel injection system with a fuel injection valve Download PDF

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Publication number
EP2917556B1
EP2917556B1 EP13765298.8A EP13765298A EP2917556B1 EP 2917556 B1 EP2917556 B1 EP 2917556B1 EP 13765298 A EP13765298 A EP 13765298A EP 2917556 B1 EP2917556 B1 EP 2917556B1
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EP
European Patent Office
Prior art keywords
valve needle
fuel
valve
fuel injection
extension
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.)
Not-in-force
Application number
EP13765298.8A
Other languages
German (de)
French (fr)
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EP2917556A1 (en
Inventor
Christoph HAIBLE
Marco Vorbach
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP2917556A1 publication Critical patent/EP2917556A1/en
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Publication of EP2917556B1 publication Critical patent/EP2917556B1/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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/008—Arrangement of fuel passages inside of injectors
    • 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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/02—Conduits between injection pumps and injectors, e.g. conduits between pump and common-rail or conduits between common-rail and injectors
    • 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
    • F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic 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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/04—Means for damping vibrations or pressure fluctuations in injection pump inlets or outlets
    • 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
    • F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
    • F02M69/46—Details, component parts or accessories not provided for in, or of interest apart from, the apparatus covered by groups F02M69/02 - F02M69/44
    • F02M69/462—Arrangement of fuel conduits, e.g. with valves for maintaining pressure in the pipes after the engine being shut-down
    • F02M69/465—Arrangement of fuel conduits, e.g. with valves for maintaining pressure in the pipes after the engine being shut-down of fuel rails
    • 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
    • F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
    • F02M69/46—Details, component parts or accessories not provided for in, or of interest apart from, the apparatus covered by groups F02M69/02 - F02M69/44
    • F02M69/50—Arrangement of fuel distributors, e.g. with means for supplying equal portion of metered fuel to injectors
    • 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
    • F02M2200/31—Fuel-injection apparatus having hydraulic pressure fluctuations damping elements
    • F02M2200/315—Fuel-injection apparatus having hydraulic pressure fluctuations damping elements for damping fuel pressure fluctuations

Definitions

  • the invention relates to a fuel injection valve, which is used in particular for fuel injection systems of internal combustion engines, and a fuel injection system with such a fuel injection valve. Specifically, the invention relates to the field of fuel injection systems of mixture-compression spark-ignition internal combustion engines.
  • a fuel injection device with at least one fuel injection valve and a fuel rail with at least one connecting piece known.
  • the fuel injection valve is introduced into a receiving opening of the connecting piece.
  • the fuel rail has a discharge port for delivering fuel to the fuel injector.
  • a pressure wave conductor connecting both is provided in such a way that dynamic pressure fluctuations in the fuel injection valve can largely be conducted past the volume of the receiving opening of the connecting piece.
  • annular leakage gap is formed, which allows a slow Druckauf- and -development in the connecting piece according to the system pressure, ie a static pressure equalization between the pressure waveguide and the wall of the discharge opening.
  • the from the DE 10 2007 049 357 A1 known fuel injection device has the disadvantage that a choke is formed by the pressure waveguide, which unfavorably affects the amount of fuel supplied per unit time at a given size of the discharge opening.
  • the fuel injection valve according to the invention with the features of claim 1 has the advantage that an improved mode of operation is achieved. Specifically, improved vibration damping can be achieved between the fuel injector and a fuel rail. In addition, pressure oscillations that affect a quantity scattering can be reduced.
  • the valve needle extension according to the invention can be actuated at least indirectly by the valve needle. This includes indirect as well as direct actuation of the valve needle extension by the valve needle. An indirect actuation can take place via one or more intermediate elements, wherein preferably a purely mechanical power transmission is realized.
  • a configuration in which the valve needle extension can be actuated directly by the valve needle is particularly advantageous. This reduces the number of parts needed and ensures reliable operation. In addition, this can be achieved by a high rigidity in the power transmission.
  • the fuel inlet is provided in an advantageous manner at a nozzle-distal end of the housing of the fuel injection valve.
  • a linear transmission of force from the valve needle to the valve needle extension is possible.
  • the valve needle and the valve needle extension can be arranged on a common axis, namely the longitudinal axis of the valve needle.
  • a receiving sleeve is provided at a nozzle distal end of the valve needle, that a valve needle near end of the valve needle extension is inserted into the receiving sleeve and that the valve needle extension is connected via the receiving sleeve with the nozzle distal end of the valve needle.
  • the receiving sleeve can be connected for example by welding or soldering to the nozzle-distal end of the valve needle and / or the valve-near end of the valve needle extension.
  • valve needle extension in the region of the fuel inlet can be moved by the opening stroke of the valve needle in such a way that a throttling action at the fuel inlet for a fuel introduced into the housing via the fuel feed increases in relation to a closed position of the valve needle.
  • valve needle extension in the closed position contributes nothing to the throttling effect on the fuel feed for the fuel introduced into the housing via the fuel feed.
  • the throttle effect is amplified so that a throttle point is formed and thus a hydraulic vibration decoupling can be generated. The thus not constantly existing throttle thus enables better and faster filling and improved pressure balance of the pressurized parts.
  • valve needle extension is designed as a pin-shaped valve needle extension.
  • the pin-shaped valve needle extension can be performed when opening the fuel injection valve in an advantageous manner from the nozzle distal end of the housing of the fuel injection valve.
  • the valve needle extension can be moved in the area of the fuel inlet such that the valve needle distal end of the valve needle extension is pushed out of the housing.
  • a passage opening is configured, wherein a needle remote end of the valve needle in and optionally through the passage opening of the wall of the fuel distributor is movable by the opening stroke of the valve needle.
  • a pin-shaped valve needle extension can in this case be designed so long that it moves in the open state of the fuel injection valve in or through the passage opening of the wall of the fuel distributor. In this case, it may be possible to dispense with a separate guidance of the valve needle extension by a suitable connection of the valve needle extension with the valve needle. Depending on the application, however, it may be possible to guide the valve needle extension, in particular with respect to a longitudinal axis of the valve needle.
  • a throttle For hydraulic decoupling of the resulting vibrations thus, for example, a throttle can be used.
  • the throttle is not achieved by installing a permanently installed constriction, but generated dynamically by the described embodiment even when opening the valve needle.
  • This throttling takes place by the valve needle extension when opening the fuel injection valve in the region of the fuel inlet, in particular in an inflow geometry of the fuel injection valve immersed and thus generates the throttle point and thus a hydraulic vibration decoupling, which ends itself again when closing. Since the throttle ratios are changed together with the opening and closing of the fuel injection valve, is given by the non-existent throttle also a better and faster filling and pressure balance of the pressurized parts.
  • the throttling serves advantageously not only to reduce noise, but also to reduce pressure oscillations, which affect a quantity scattering.
  • This reduction of pressure oscillations and pressure pulsations results in a more uniform quantity delivery of the fuel injection valve from injection to injection.
  • emissions, consumption and a power output are better controllable.
  • Fig. 1 shows a fuel injection valve 1 in a schematic representation according to an embodiment.
  • the fuel injection valve 1 is used in particular for a fuel injection system 2 (FIG. Fig. 2 ) of internal combustion engines.
  • the fuel injection valve 1 can in this case be designed in particular for high-pressure injection in internal combustion engines.
  • Such an internal combustion engine can be, for example, a mixture-compression, spark-ignited internal combustion engine.
  • the fuel injection valve 1 according to the invention and the fuel injection system 2 according to the invention are also suitable for other applications.
  • the fuel injection valve 1 has a housing 3, which may be configured as a multi-part housing 3. On the housing 3, a fuel inlet 4 is provided.
  • the housing 3 comprises a nozzle body 5, in which a valve needle 6 is guided along an axis 7, which is the longitudinal axis 7 of the valve needle 6.
  • the valve needle 6 extends in this embodiment along the longitudinal axis 7 through the nozzle body 5 and partially through the housing 3.
  • a schematically illustrated valve closing body 8 is configured at the valve needle 6 .
  • the valve closing body 8 of the valve needle 6 is located at a nozzle-near end 9 of the housing third
  • the fuel inlet 4 is located in this embodiment at a nozzle distal end 10 of the housing. 3
  • the fuel injection valve 1 has a valve needle extension 15, which is aligned on the longitudinal axis 7 of the valve needle 6.
  • the valve needle 6 can be actuated in an opening direction 16 along the longitudinal axis 7.
  • Such an operation can be done for example via a magnetic actuator.
  • an opening stroke of the valve needle 6 is effected.
  • the valve needle extension 15 is moved in the region of the fuel inlet 4.
  • a valve needle near end 17 of the valve needle extension 15 is located at a nozzle distal end 18 of the valve needle 6 at.
  • a direct actuation of the valve needle extension 15 is given by the valve needle 6.
  • the opening stroke of the valve needle 6 in the opening direction 16 thus causes an equal stroke of the valve needle extension 15 at the fuel inlet. 4
  • Fig. 2 shows the fuel injection system 2 with the in Fig. 1 illustrated fuel injector 1 according to the embodiment in an excerptive, schematic sectional view in a closed state of the valve needle 6 of the fuel injector 1.
  • a receiving sleeve 20 is provided at the nozzle distal end 18 of the valve needle 6.
  • the valve needle near end 17 of the valve needle extension 15 is inserted into the receiving sleeve 20.
  • the receiving sleeve 20 may be connected, for example, by welding or soldering with the nozzle distal end 18 of the valve needle 6. Accordingly, a connection of the valve needle near end 17 of the valve needle extension 15 with the receiving sleeve 20 is possible by welding or soldering.
  • the end 17 of the valve needle extension 15 can also be pressed into the receiving sleeve 20.
  • the valve needle extension 15 via the receiving sleeve 20 is reliably connected to the nozzle-distal end 18 of the valve needle 6.
  • valve needle extension 15 Through this connection of the valve needle extension 15 with the valve needle 6, an alignment of the valve needle extension 15 with respect to the longitudinal axis 7 of the valve needle 6 is achieved.
  • the valve needle extension 15 is located on the longitudinal axis 7 of the valve needle 6. An additional guidance of the valve needle extension 15 is thus not required.
  • the valve needle extension 15 is designed as a pin-shaped valve needle extension 15.
  • the fuel injection system 2 also has a fuel distributor 21.
  • the fuel distributor 21 in this embodiment comprises a distributor tube 22 and a connecting piece 23.
  • the connecting piece 23 may be configured, for example, as a cup-shaped connecting piece 23.
  • This embodiment of the fuel distributor 21 designed as a fuel rail 21.
  • the manifold 22 of the fuel distributor 21 has a wall 24.
  • a passage opening 25 is configured in the region of the connecting piece 23. Through the passage opening 25 can be performed in operation from a fuel chamber 26 formed in the interior of the manifold 22 under high pressure fuel in the fuel inlet 4 at the nozzle distal end 10 of the housing 3.
  • a sealing ring 27 is provided between the connecting piece 23 and the fuel injection valve 1.
  • valve needle remote end 28 of the valve needle extension 15 is slightly spaced from the passage opening 25 of the manifold 22. This avoids that the valve needle extension 15 causes a throttle effect for the supplied fuel.
  • the valve needle extension 15 thus contributes at least approximately nothing in the closed position to the throttling action on the fuel inlet 4 for the fuel introduced into the housing 3 via the fuel inlet 4.
  • Fig. 3 shows the in Fig. 2 illustrated fuel injection system 2 with the fuel injection valve 1 and the fuel distributor 21 in an excerpt, schematic sectional view according to the embodiment in an open state of the valve needle 6 of the fuel injection valve 1.
  • the valve needle 6 is now adjusted in the opening direction 16 by a certain opening stroke. This directly causes an equal adjustment of the valve needle extension 15 in the opening direction 16.
  • the valve needle distal end 28 of the valve needle extension 15 firstly enters the passage opening 25 Fig. 3 illustrated position, the valve needle remote end 28 of the valve needle extension 15 extends even through the through hole 25 of the wall 24 of the manifold 22nd
  • valve needle extension 15 throttling for the fuel supplied to the fuel inlet 4. Because the opening stroke of the valve needle 6, the valve needle extension 15 is moved in the region of the fuel inlet 4 so that the throttle effect on the fuel inlet 4 for the via the fuel inlet 4 guided in the housing 3 fuel relative to the closed position of the valve needle 6 increases. In this embodiment will through the opening stroke of the valve needle 6, the valve needle extension 15 pushed out of the nozzle-distal end 10 of the housing 3.
  • valve needle 6 is designed as an inwardly opening valve needle 6 of the fuel injection valve 1
  • valve needle extension 15 is pushed out of the housing 3 directly by opening the valve needle 6.

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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 Erfindung betrifft ein Brennstoffeinspritzventil, das insbesondere für Brennstoffeinspritzanlagen von Brennkraftmaschinen dient, und eine Brennstoffeinspritzanlage mit solch einem Brennstoffeinspritzventil. Speziell betrifft die Erfindung das Gebiet der Brennstoffeinspritzanlagen von gemischverdichtenden, fremdgezündeten Brennkraftmaschinen.The invention relates to a fuel injection valve, which is used in particular for fuel injection systems of internal combustion engines, and a fuel injection system with such a fuel injection valve. Specifically, the invention relates to the field of fuel injection systems of mixture-compression spark-ignition internal combustion engines.

Aus der DE 10 2007 049 357 A1 ist eine Brennstoffeinspritzvorrichtung mit wenigstens einem Brennstoffeinspritzventil und einer Brennstoffverteilerleitung mit wenigstens einem Anschlussstutzen bekannt. Hierbei ist das Brennstoffeinspritzventil in eine Aufnahmeöffnung des Anschlussstutzens eingebracht. Die Brennstoffverteilerleiste besitzt zur Abgabe von Brennstoff an das Brennstoffeinspritzventil eine Abströmöffnung. Zwischen dem Brennstoffeinspritzventil und der Brennstoffverteilerleitung ist ein beide verbindender Druckwellenleiter derart vorgesehen, dass dynamische Druckschwankungen im Brennstoffeinspritzventil weitgehend am Volumen der Aufnahmeöffnung des Anschlussstutzens vorbei leitbar sind. Hierbei ist im Bereich der Abströmöffnung der Brennstoffverteilerleitung, die vom Druckwellenleiter durchragt wird, ein ringförmiger Leckagespalt gebildet, der zwischen dem Druckwellenleiter und der Wandung der Abströmöffnung einen langsamen Druckauf- und -abbau in dem Anschlussstutzen entsprechend dem Systemdruck, also einen statischen Druckausgleich, erlaubt.From the DE 10 2007 049 357 A1 is a fuel injection device with at least one fuel injection valve and a fuel rail with at least one connecting piece known. Here, the fuel injection valve is introduced into a receiving opening of the connecting piece. The fuel rail has a discharge port for delivering fuel to the fuel injector. Between the fuel injection valve and the fuel distributor line, a pressure wave conductor connecting both is provided in such a way that dynamic pressure fluctuations in the fuel injection valve can largely be conducted past the volume of the receiving opening of the connecting piece. Here, in the region of the outflow opening of the fuel distributor line, which is penetrated by the pressure waveguide, an annular leakage gap is formed, which allows a slow Druckauf- and -development in the connecting piece according to the system pressure, ie a static pressure equalization between the pressure waveguide and the wall of the discharge opening.

Die aus der DE 10 2007 049 357 A1 bekannte Brennstoffeinspritzvorrichtung hat den Nachteil, dass durch den Druckwellenleiter eine Drossel gebildet ist, was sich bei gegebener Größe der Abströmöffnung ungünstig auf die pro Zeiteinheit zuführbare Brennstoffmenge auswirkt.The from the DE 10 2007 049 357 A1 known fuel injection device has the disadvantage that a choke is formed by the pressure waveguide, which unfavorably affects the amount of fuel supplied per unit time at a given size of the discharge opening.

Offenbarung der ErfindungDisclosure of the invention

Das erfindungsgemäße Brennstoffeinspritzventil mit den Merkmalen des Anspruchs 1 hat den Vorteil, dass eine verbesserte Funktionsweise erzielt ist. Speziell kann eine verbesserte Schwingungsdämpfung zwischen dem Brennstoffeinspritzventil und einem Brennstoffverteiler erzielt werden. Außerdem können Druckschwingungen, die sich auf eine Mengenstreuung auswirken, reduziert werden.The fuel injection valve according to the invention with the features of claim 1 has the advantage that an improved mode of operation is achieved. Specifically, improved vibration damping can be achieved between the fuel injector and a fuel rail. In addition, pressure oscillations that affect a quantity scattering can be reduced.

Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen des im Anspruch 1 angegebenen Brennstoffeinspritzventils möglich.The measures listed in the dependent claims advantageous developments of the fuel injection valve specified in claim 1 are possible.

Die Ventilnadelverlängerung ist erfindungsgemäß zumindest mittelbar von der Ventilnadel betätigbar. Dies schließt eine mittelbare als auch eine direkte Betätigung der Ventilnadelverlängerung durch die Ventilnadel ein. Eine mittelbare Betätigung kann dabei über ein oder mehrere zwischengeschaltete Elemente erfolgen, wobei vorzugsweise eine rein mechanische Kraftübertragung realisiert ist. Besonders vorteilhaft ist allerdings eine Ausgestaltung, bei der die Ventilnadelverlängerung von der Ventilnadel direkt betätigbar ist. Dies reduziert die Anzahl der benötigten Teile und gewährleistet einen zuverlässigen Betrieb. Außerdem kann hierdurch eine hohe Steifigkeit in der Kraftübertragung erzielt werden.The valve needle extension according to the invention can be actuated at least indirectly by the valve needle. This includes indirect as well as direct actuation of the valve needle extension by the valve needle. An indirect actuation can take place via one or more intermediate elements, wherein preferably a purely mechanical power transmission is realized. However, a configuration in which the valve needle extension can be actuated directly by the valve needle is particularly advantageous. This reduces the number of parts needed and ensures reliable operation. In addition, this can be achieved by a high rigidity in the power transmission.

Der Brennstoffzulauf ist in vorteilhafter Weise an einem düsenfernen Ende des Gehäuses des Brennstoffeinspritzventils vorgesehen. Hierdurch ist eine lineare Kraftübertragung von der Ventilnadel auf die Ventilnadelverlängerung möglich. Speziell können die Ventilnadel und die Ventilnadelverlängerung auf einer gemeinsamen Achse, nämlich der Längsachse der Ventilnadel, angeordnet sein.The fuel inlet is provided in an advantageous manner at a nozzle-distal end of the housing of the fuel injection valve. As a result, a linear transmission of force from the valve needle to the valve needle extension is possible. Specifically, the valve needle and the valve needle extension can be arranged on a common axis, namely the longitudinal axis of the valve needle.

Vorteilhaft ist es ferner, dass an einem düsenfernen Ende der Ventilnadel eine Aufnahmehülse vorgesehen ist, dass ein ventilnadelnahes Ende der Ventilnadelverlängerung in die Aufnahmehülse eingefügt ist und dass die Ventilnadelverlängerung über die Aufnahmehülse mit dem düsenfernen Ende der Ventilnadel verbunden ist. Die Aufnahmehülse kann beispielsweise durch Schweißen oder Löten mit dem düsenfernen Ende der Ventilnadel und/oder dem ventilnahen Ende der Ventilnadelverlängerung verbunden sein. Somit ist eine hohe mechanische Stabilität gewährleistet. Dies ermöglicht eine zuverlässige Positionierung der Ventilnadelverlängerung, insbesondere eine axiale Ausrichtung der Ventilnadelverlängerung bezüglich der Längsachse der Ventilnadel.It is also advantageous that a receiving sleeve is provided at a nozzle distal end of the valve needle, that a valve needle near end of the valve needle extension is inserted into the receiving sleeve and that the valve needle extension is connected via the receiving sleeve with the nozzle distal end of the valve needle. The receiving sleeve can be connected for example by welding or soldering to the nozzle-distal end of the valve needle and / or the valve-near end of the valve needle extension. Thus, a high mechanical stability is guaranteed. This allows a reliable positioning of the valve needle extension, in particular an axial alignment of the valve needle extension with respect to the longitudinal axis of the valve needle.

Außerdem ist es vorteilhaft, dass durch den Öffnungshub der Ventilnadel die Ventilnadelverlängerung im Bereich des Brennstoffzulaufs so bewegbar ist, dass eine Drosselwirkung an dem Brennstoffzulauf für einen über den Brennstoffzulauf in das Gehäuse geführten Brennstoff gegenüber einer geschlossenen Stellung der Ventilnadel zunimmt. Hierbei ist es ferner vorteilhaft, dass die Ventilnadelverlängerung in der geschlossenen Stellung zur Drosselwirkung an dem Brennstoffzulauf für den über den Brennstoffzulauf in das Gehäuse geführten Brennstoff nichts beiträgt. In der geschlossenen Stellung der Ventilnadel ist somit eine minimale Drosselwirkung realisiert, so dass der für die Einspritzung, das heißt in der Regel die nächste Einspritzung oder den nächsten Einspritzvorgang, benötigte Brennstoffdruck rasch aufgebaut werden kann. Bei geöffneter Düsennadel wird hingegen die Drosselwirkung verstärkt, so dass eine Drosselstelle gebildet wird und somit eine hydraulische Schwingungsentkopplung erzeugt werden kann. Die dadurch nicht ständig vorhandene Drossel ermöglicht somit eine bessere und schnellere Befüllung sowie eine verbesserte Druckausgeglichenheit der druckbeaufschlagten Teile.Moreover, it is advantageous that the valve needle extension in the region of the fuel inlet can be moved by the opening stroke of the valve needle in such a way that a throttling action at the fuel inlet for a fuel introduced into the housing via the fuel feed increases in relation to a closed position of the valve needle. In this case, it is further advantageous that the valve needle extension in the closed position contributes nothing to the throttling effect on the fuel feed for the fuel introduced into the housing via the fuel feed. In the closed position of the valve needle thus a minimum throttling effect is realized, so that the fuel pressure required for the injection, that is usually the next injection or the next injection process, can be built up quickly. When the nozzle needle is open, however, the throttle effect is amplified so that a throttle point is formed and thus a hydraulic vibration decoupling can be generated. The thus not constantly existing throttle thus enables better and faster filling and improved pressure balance of the pressurized parts.

Vorteilhaft ist es ferner, dass die Ventilnadelverlängerung als stiftförmige Ventilnadelverlängerung ausgestaltet ist. Die stiftförmige Ventilnadelverlängerung kann beim Öffnen des Brennstoffeinspritzventils in vorteilhafter Weise aus dem düsenfernen Ende des Gehäuses des Brennstoffeinspritzventils geführt werden. Hierbei ist es vorteilhaft, dass durch den Öffnungshub der Ventilnadel die Ventilnadelverlängerung im Bereich des Brennstoffzulaufs so bewegbar ist, dass das ventilnadelferne Ende der Ventilnadelverlängerung aus dem Gehäuse geschoben wird. Durch eine entsprechend dimensionierte Länge der Ventilnadelverlängerung ist hierbei eine Anpassung an den jeweiligen Anwendungsfall möglich. Hierdurch kann gegebenenfalls mit geringfügigen Modifikationen ein großer Einsatzbereich realisiert werden. In der Wand des Brennstoffverteilers ist eine Durchgangsöffnung ausgestaltet wobei durch den Öffnungshub der Ventilnadel ein nadelfernes Ende der Ventilnadel in und gegebenenfalls durch die Durchgangsöffnung der Wand des Brennstoffverteilers bewegbar ist. Speziell eine stiftförmige Ventilnadelverlängerung kann hierbei so lang ausgestaltet sein, dass diese sich im geöffneten Zustand des Brennstoffeinspritzventils in beziehungsweise durch die Durchgangsöffnung der Wand des Brennstoffverteilers bewegt. Hierbei kann durch eine geeignete Verbindung der Ventilnadelverlängerung mit der Ventilnadel gegebenenfalls auf eine separate Führung der Ventilnadelverlängerung verzichtet werden. Je nach Anwendungsfall ist allerdings gegebenenfalls auch eine Führung der Ventilnadelverlängerung, insbesondere bezüglich einer Längsachse der Ventilnadel, möglich.It is also advantageous that the valve needle extension is designed as a pin-shaped valve needle extension. The pin-shaped valve needle extension can be performed when opening the fuel injection valve in an advantageous manner from the nozzle distal end of the housing of the fuel injection valve. In this case, it is advantageous that, as a result of the opening stroke of the valve needle, the valve needle extension can be moved in the area of the fuel inlet such that the valve needle distal end of the valve needle extension is pushed out of the housing. By an appropriately sized length of the valve needle extension in this case an adaptation to the particular application is possible. As a result, it is possible, if necessary, to realize a wide range of applications with minor modifications. In the wall of the fuel distributor, a passage opening is configured, wherein a needle remote end of the valve needle in and optionally through the passage opening of the wall of the fuel distributor is movable by the opening stroke of the valve needle. Specifically, a pin-shaped valve needle extension can in this case be designed so long that it moves in the open state of the fuel injection valve in or through the passage opening of the wall of the fuel distributor. In this case, it may be possible to dispense with a separate guidance of the valve needle extension by a suitable connection of the valve needle extension with the valve needle. Depending on the application, however, it may be possible to guide the valve needle extension, in particular with respect to a longitudinal axis of the valve needle.

Bei Brennstoffeinspritzvorgängen können innerhalb der Brennstoffeinspritzventile der Brennstoffeinspritzanlage aufgrund der dynamischen Verstellung der Ventilnadel auftretende hydraulische Schwingungen prinzipiell auch auf den Brennstoffverteiler, insbesondere eine Brennstoffverteilerleiste, übertragen werden. Wenn diese Schwingungen von dem jeweiligen Brennstoffeinspritzventil in den Brennstoffverteiler übergehen, dann wirkt sich dies ungünstig auf die Schallabstrahlung und somit das Geräusch der Brennstoffeinspritzanlage aus. Durch die erfindungsgemäß mögliche Minderung der hydraulisch erzeugten Schwingungen bei den Einspritzvorgängen können somit solche unerwünschten Effekte reduziert werden. Hierbei wird eine kostengünstige Realisierung möglich, da am Brennstoffverteiler oder dem Brennstoffeinspritzventil keine zusätzlichen Dämpfungsbauteile erforderlich sind. Allerdings ist gegebenenfalls auch eine Kombination mit zusätzlichen Dämpfungsbauteilen denkbar, um eine weitere Verbesserung bei der Geräuschreduzierung zu erzielen.In fuel injection processes occurring within the fuel injection valves of the fuel injection system due to the dynamic adjustment of the valve needle hydraulic vibrations in principle also on the fuel distributor, in particular a fuel distributor bar, are transmitted. When these vibrations pass from the respective fuel injection valve into the fuel distributor, this has an unfavorable effect on the sound radiation and thus the noise of the fuel injection system. As a result of the invention's possible reduction of the hydraulically generated vibrations in the injection processes, such undesired effects can thus be reduced. In this case, a cost-effective implementation is possible because no additional damping components are required at the fuel distributor or the fuel injection valve. However, if necessary, a combination with additional damping components is conceivable in order to achieve a further improvement in the noise reduction.

Zur hydraulischen Entkopplung der entstehenden Schwingungen kann somit beispielsweise eine Drossel zur Anwendung kommen. Die Drossel wird hierbei jedoch nicht durch den Einbau einer fest installierten Engstelle erreicht, sondern durch die beschriebene Ausgestaltung selbst beim Öffnen der Ventilnadel jedes Mal dynamisch erzeugt. Diese Androsselung erfolgt, indem die Ventilnadelverlängerung beim Öffnen des Brennstoffeinspritzventils in den Bereich des Brennstoffzulaufs, insbesondere in eine Zuströmgeometrie des Brennstoffeinspritzventils, eintaucht und somit die Drosselstelle und damit eine hydraulische Schwingungsentkopplung erzeugt, die sich beim Schließen wieder selbst beendet. Da die Drosselverhältnisse gemeinsam mit dem Öffnen und Schließen des Brennstoffeinspritzventils verändert werden, ist durch die nicht ständig vorhandene Drossel zudem eine bessere und schnellere Befüllung und Druckausgeglichenheit der druckbeaufschlagten Teile gegeben.For hydraulic decoupling of the resulting vibrations thus, for example, a throttle can be used. However, the throttle is not achieved by installing a permanently installed constriction, but generated dynamically by the described embodiment even when opening the valve needle. This throttling takes place by the valve needle extension when opening the fuel injection valve in the region of the fuel inlet, in particular in an inflow geometry of the fuel injection valve immersed and thus generates the throttle point and thus a hydraulic vibration decoupling, which ends itself again when closing. Since the throttle ratios are changed together with the opening and closing of the fuel injection valve, is given by the non-existent throttle also a better and faster filling and pressure balance of the pressurized parts.

Somit dient die Androsselung in vorteilhafter Weise nicht nur zur Geräuschreduktion, sondern auch zur Reduktion von Druckschwingungen, die sich auf eine Mengenstreuung auswirken. Durch diese Reduktion von Druckschwingungen und Druckpulsationen ergibt sich eine gleichmäßigere Mengenabgabe des Brennstoffeinspritzventils von Einspritzung zu Einspritzung. Somit sind Emissionen, ein Verbrauch und eine Leistungsabgabe besser steuerbar.Thus, the throttling serves advantageously not only to reduce noise, but also to reduce pressure oscillations, which affect a quantity scattering. This reduction of pressure oscillations and pressure pulsations results in a more uniform quantity delivery of the fuel injection valve from injection to injection. Thus, emissions, consumption and a power output are better controllable.

Kurze Beschreibung der ZeichnungenBrief description of the drawings

Bevorzuge Ausführungsbeispiele der Erfindung sind in der nachfolgenden Beschreibung unter Bezugnahme auf die beigefügten Zeichnungen, in denen sich entsprechende Elemente mit übereinstimmenden Bezugszeichen versehen sind, näher erläutert. Es zeigt:

  • Fig. 1 ein Brennstoffeinspritzventil in einer schematischen Darstellung entsprechend einem Ausführungsbeispiel der Erfindung;
  • Fig. 2 eine Brennstoffeinspritzanlage mit dem in Fig. 1 dargestellten Brennstoffeinspritzventil in einer auszugsweisen, schematischen Schnittdarstellung entsprechend dem Ausführungsbeispiel der Erfindung in einem geschlossenen Zustand und
  • Fig. 3 die in Fig. 2 dargestellte Brennstoffeinspritzanlage mit dem Brennstoffeinspritzventil entsprechend dem Ausführungsbeispiel der Erfindung in einem geöffneten Zustand.
Preferred embodiments of the invention are explained in more detail in the following description with reference to the accompanying drawings, in which corresponding elements are provided with corresponding reference numerals. It shows:
  • Fig. 1 a fuel injection valve in a schematic representation according to an embodiment of the invention;
  • Fig. 2 a fuel injection system with the in Fig. 1 illustrated fuel injector in a partial, schematic sectional view according to the embodiment of the invention in a closed state and
  • Fig. 3 in the Fig. 2 illustrated fuel injection system with the fuel injection valve according to the embodiment of the invention in an open state.

Ausführungsformen der ErfindungEmbodiments of the invention

Fig. 1 zeigt ein Brennstoffeinspritzventil 1 in einer schematischen Darstellung entsprechend einem Ausführungsbeispiel. Das Brennstoffeinspritzventil 1 dient insbesondere für eine Brennstoffeinspritzanlage 2 (Fig. 2) von Brennkraftmaschinen. Das Brennstoffeinspritzventil 1 kann hierbei insbesondere zur Hochdruckeinspritzung bei Brennkraftmaschinen ausgestaltet sein. Bei solch einer Brennkraftmaschine kann es sich beispielsweise um eine gemischverdichtende, fremdgezündete Brennkraftmaschine handeln. Das erfindungsgemäße Brennstoffeinspritzventil 1 und die erfindungsgemäße Brennstoffeinspritzanlage 2 eignen sich jedoch auch für andere Anwendungsfälle. Fig. 1 shows a fuel injection valve 1 in a schematic representation according to an embodiment. The fuel injection valve 1 is used in particular for a fuel injection system 2 (FIG. Fig. 2 ) of internal combustion engines. The fuel injection valve 1 can in this case be designed in particular for high-pressure injection in internal combustion engines. Such an internal combustion engine can be, for example, a mixture-compression, spark-ignited internal combustion engine. However, the fuel injection valve 1 according to the invention and the fuel injection system 2 according to the invention are also suitable for other applications.

Das Brennstoffeinspritzventil 1 weist ein Gehäuse 3 auf, das als mehrteiliges Gehäuse 3 ausgestaltet sein kann. An dem Gehäuse 3 ist ein Brennstoffzulauf 4 vorgesehen. Das Gehäuse 3 umfasst einen Düsenkörper 5, in dem eine Ventilnadel 6 entlang einer Achse 7, die die Längsachse 7 der Ventilnadel 6 ist, geführt ist. Die Ventilnadel 6 erstreckt sich hierbei in diesem Ausführungsbeispiel entlang der Längsachse 7 durch den Düsenkörper 5 und teilweise durch das Gehäuse 3. An der Ventilnadel 6 ist ein schematisch veranschaulichter Ventilschließkörper 8 ausgestaltet. Der Ventilschließkörper 8 der Ventilnadel 6 befindet sich an einem düsennahen Ende 9 des Gehäuses 3.The fuel injection valve 1 has a housing 3, which may be configured as a multi-part housing 3. On the housing 3, a fuel inlet 4 is provided. The housing 3 comprises a nozzle body 5, in which a valve needle 6 is guided along an axis 7, which is the longitudinal axis 7 of the valve needle 6. The valve needle 6 extends in this embodiment along the longitudinal axis 7 through the nozzle body 5 and partially through the housing 3. At the valve needle 6 is a schematically illustrated valve closing body 8 is configured. The valve closing body 8 of the valve needle 6 is located at a nozzle-near end 9 of the housing third

Der Brennstoffzulauf 4 befindet sich in diesem Ausführungsbeispiel an einem düsenfernen Ende 10 des Gehäuses 3.The fuel inlet 4 is located in this embodiment at a nozzle distal end 10 of the housing. 3

Das Brennstoffeinspritzventil 1 weist eine Ventilnadelverlängerung 15 auf, die an der Längsachse 7 der Ventilnadel 6 ausgerichtet ist. Im Betrieb ist die Ventilnadel 6 in einer Öffnungsrichtung 16 entlang der Längsachse 7 betätigbar. Solch eine Betätigung kann beispielsweise über einen magnetischen Aktor erfolgen. Hierdurch wird ein Öffnungshub der Ventilnadel 6 bewirkt. Durch den Öffnungshub der Ventilnadel 6 wird die Ventilnadelverlängerung 15 im Bereich des Brennstoffzulaufs 4 bewegt. In diesem Ausführungsbeispiel liegt ein ventilnadelnahes Ende 17 der Ventilnadelverlängerung 15 an einem düsenfernen Ende 18 der Ventilnadel 6 an. Hierdurch ist eine direkte Betätigung der Ventilnadelverlängerung 15 durch die Ventilnadel 6 gegeben. Der Öffnungshub der Ventilnadel 6 in der Öffnungsrichtung 16 bewirkt somit einen gleichgroßen Hub der Ventilnadelverlängerung 15 am Brennstoffzulauf 4.The fuel injection valve 1 has a valve needle extension 15, which is aligned on the longitudinal axis 7 of the valve needle 6. In operation, the valve needle 6 can be actuated in an opening direction 16 along the longitudinal axis 7. Such an operation can be done for example via a magnetic actuator. As a result, an opening stroke of the valve needle 6 is effected. Through the opening stroke of the valve needle 6, the valve needle extension 15 is moved in the region of the fuel inlet 4. In this embodiment, a valve needle near end 17 of the valve needle extension 15 is located at a nozzle distal end 18 of the valve needle 6 at. As a result, a direct actuation of the valve needle extension 15 is given by the valve needle 6. The opening stroke of the valve needle 6 in the opening direction 16 thus causes an equal stroke of the valve needle extension 15 at the fuel inlet. 4

Fig. 2 zeigt die Brennstoffeinspritzanlage 2 mit dem in Fig. 1 dargestellten Brennstoffeinspritzventil 1 entsprechend dem Ausführungsbeispiel in einer auszugsweisen, schematischen Schnittdarstellung in einem geschlossenen Zustand der Ventilnadel 6 des Brennstoffeinspritzventils 1. An dem düsenfernen Ende 18 der Ventilnadel 6 ist eine Aufnahmehülse 20 vorgesehen. Das ventilnadelnahe Ende 17 der Ventilnadelverlängerung 15 ist in die Aufnahmehülse 20 eingefügt. Die Aufnahmehülse 20 kann beispielsweise durch Schweißen oder Löten mit dem düsenfernen Ende 18 der Ventilnadel 6 verbunden sein. Entsprechend ist durch Schweißen oder Löten auch eine Verbindung des ventilnadelnahen Endes 17 der Ventilnadelverlängerung 15 mit der Aufnahmehülse 20 möglich. Das Ende 17 der Ventilnadelverlängerung 15 kann allerdings auch in die Aufnahmehülse 20 eingepresst sein. Somit ist die Ventilnadelverlängerung 15 über die Aufnahmehülse 20 zuverlässig mit dem düsenfernen Ende 18 der Ventilnadel 6 verbunden. Fig. 2 shows the fuel injection system 2 with the in Fig. 1 illustrated fuel injector 1 according to the embodiment in an excerptive, schematic sectional view in a closed state of the valve needle 6 of the fuel injector 1. At the nozzle distal end 18 of the valve needle 6, a receiving sleeve 20 is provided. The valve needle near end 17 of the valve needle extension 15 is inserted into the receiving sleeve 20. The receiving sleeve 20 may be connected, for example, by welding or soldering with the nozzle distal end 18 of the valve needle 6. Accordingly, a connection of the valve needle near end 17 of the valve needle extension 15 with the receiving sleeve 20 is possible by welding or soldering. However, the end 17 of the valve needle extension 15 can also be pressed into the receiving sleeve 20. Thus, the valve needle extension 15 via the receiving sleeve 20 is reliably connected to the nozzle-distal end 18 of the valve needle 6.

Durch diese Verbindung der Ventilnadelverlängerung 15 mit der Ventilnadel 6 ist eine Ausrichtung der Ventilnadelverlängerung 15 bezüglich der Längsachse 7 der Ventilnadel 6 erzielt. In diesem Ausführungsbeispiel liegt die Ventilnadelverlängerung 15 auf der Längsachse 7 der Ventilnadel 6. Eine zusätzliche Führung der Ventilnadelverlängerung 15 ist somit nicht erforderlich.Through this connection of the valve needle extension 15 with the valve needle 6, an alignment of the valve needle extension 15 with respect to the longitudinal axis 7 of the valve needle 6 is achieved. In this embodiment, the valve needle extension 15 is located on the longitudinal axis 7 of the valve needle 6. An additional guidance of the valve needle extension 15 is thus not required.

Die Ventilnadelverlängerung 15 ist als stiftförmige Ventilnadelverlängerung 15 ausgestaltet.The valve needle extension 15 is designed as a pin-shaped valve needle extension 15.

Die Brennstoffeinspritzanlage 2 weist außerdem einen Brennstoffverteiler 21 auf. Der Brennstoffverteiler 21 umfasst in diesem Ausführungsbeispiel ein Verteilerrohr 22 und ein Anschlussstück 23. Hierbei ist eine mehrteilige Ausgestaltung möglich. Das Anschlussstück 23 kann beispielsweise als tassenförmiges Anschlussstück 23 ausgestaltet sein. Somit ist in diesem Ausführungsbeispiel der Brennstoffverteiler 21 als Brennstoffverteilerleiste 21 ausgestaltet.The fuel injection system 2 also has a fuel distributor 21. The fuel distributor 21 in this embodiment comprises a distributor tube 22 and a connecting piece 23. In this case, a multi-part embodiment is possible. The connecting piece 23 may be configured, for example, as a cup-shaped connecting piece 23. Thus, in This embodiment of the fuel distributor 21 designed as a fuel rail 21.

Das Verteilerrohr 22 des Brennstoffverteilers 21 weist eine Wand 24 auf. In der Wand 24 des Verteilerrohrs 22 ist im Bereich des Anschlussstücks 23 eine Durchgangsöffnung 25 ausgestaltet. Durch die Durchgangsöffnung 25 kann im Betrieb aus einem im Inneren des Verteilerrohrs 22 gebildeten Brennstoffraum 26 unter hohem Druck stehender Brennstoff in den Brennstoffzulauf 4 am düsenfernen Ende 10 des Gehäuses 3 geführt werden. Zur Abdichtung ist hierbei zwischen dem Anschlussstück 23 und dem Brennstoffeinspritzventil 1 ein Dichtring 27 vorgesehen.The manifold 22 of the fuel distributor 21 has a wall 24. In the wall 24 of the manifold 22, a passage opening 25 is configured in the region of the connecting piece 23. Through the passage opening 25 can be performed in operation from a fuel chamber 26 formed in the interior of the manifold 22 under high pressure fuel in the fuel inlet 4 at the nozzle distal end 10 of the housing 3. For sealing in this case a sealing ring 27 is provided between the connecting piece 23 and the fuel injection valve 1.

In dem in der Fig. 2 dargestellten geschlossenen Zustand der Ventilnadel 6 ist ein ventilnadelfernes Ende 28 der Ventilnadelverlängerung 15 etwas von der Durchgangsöffnung 25 des Verteilerrohrs 22 beabstandet. Hierdurch wird vermieden, dass die Ventilnadelverlängerung 15 eine Drosselwirkung für den zugeführten Brennstoff bewirkt. Die Ventilnadelverlängerung 15 trägt somit in der geschlossenen Stellung zur Drosselwirkung an dem Brennstoffzulauf 4 für den über den Brennstoffzulauf 4 in das Gehäuses 3 geführten Brennstoff zumindest näherungsweise nichts bei.In the in the Fig. 2 illustrated closed state of the valve needle 6 is a valve needle remote end 28 of the valve needle extension 15 is slightly spaced from the passage opening 25 of the manifold 22. This avoids that the valve needle extension 15 causes a throttle effect for the supplied fuel. The valve needle extension 15 thus contributes at least approximately nothing in the closed position to the throttling action on the fuel inlet 4 for the fuel introduced into the housing 3 via the fuel inlet 4.

Fig. 3 zeigt die in Fig. 2 dargestellte Brennstoffeinspritzanlage 2 mit dem Brennstoffeinspritzventil 1 und dem Brennstoffverteiler 21 in einer auszugsweisen, schematischen Schnittdarstellung entsprechend dem Ausführungsbeispiel in einem geöffneten Zustand der Ventilnadel 6 des Brennstoffeinspritzventils 1. Gegenüber der in der Fig. 2 dargestellten geschlossenen Stellung der Ventilnadel 6 ist die Ventilnadel 6 nun in der Öffnungsrichtung 16 um einen gewissen Öffnungshub verstellt. Dies bewirkt direkt eine gleich große Verstellung der Ventilnadelverlängerung 15 in der Öffnungsrichtung 16. Hierdurch gelangt während der Öffnungsbewegung das ventilnadelferne Ende 28 der Ventilnadelverlängerung 15 zunächst in die Durchgangsöffnung 25. In der in der Fig. 3 dargestellten Stellung erstreckt sich das ventilnadelferne Ende 28 der Ventilnadelverlängerung 15 sogar durch die Durchgangsöffnung 25 der Wand 24 des Verteilerrohrs 22. Fig. 3 shows the in Fig. 2 illustrated fuel injection system 2 with the fuel injection valve 1 and the fuel distributor 21 in an excerpt, schematic sectional view according to the embodiment in an open state of the valve needle 6 of the fuel injection valve 1. Opposite in the Fig. 2 illustrated closed position of the valve needle 6, the valve needle 6 is now adjusted in the opening direction 16 by a certain opening stroke. This directly causes an equal adjustment of the valve needle extension 15 in the opening direction 16. In this way, during the opening movement, the valve needle distal end 28 of the valve needle extension 15 firstly enters the passage opening 25 Fig. 3 illustrated position, the valve needle remote end 28 of the valve needle extension 15 extends even through the through hole 25 of the wall 24 of the manifold 22nd

Somit kommt es im geöffneten Zustand zu einer durch die Ventilnadelverlängerung 15 verursachten Drosselung für den zugeführten Brennstoff am Brennstoffzulauf 4. Denn durch den Öffnungshub der Ventilnadel 6 wird die Ventilnadelverlängerung 15 im Bereich des Brennstoffzulaufs 4 so bewegt, dass die Drosselwirkung an dem Brennstoffzulauf 4 für den über den Brennstoffzulauf 4 in das Gehäuse 3 geführten Brennstoff gegenüber der geschlossenen Stellung der Ventilnadel 6 zunimmt. In diesem Ausführungsbeispiel wird durch den Öffnungshub der Ventilnadel 6 die Ventilnadelverlängerung 15 aus dem düsenfernen Ende 10 des Gehäuses 3 herausgeschoben.Thus, it comes in the open state to a caused by the valve needle extension 15 throttling for the fuel supplied to the fuel inlet 4. Because the opening stroke of the valve needle 6, the valve needle extension 15 is moved in the region of the fuel inlet 4 so that the throttle effect on the fuel inlet 4 for the via the fuel inlet 4 guided in the housing 3 fuel relative to the closed position of the valve needle 6 increases. In this embodiment will through the opening stroke of the valve needle 6, the valve needle extension 15 pushed out of the nozzle-distal end 10 of the housing 3.

Da die Ventilnadel 6 als nach innen öffnende Ventilnadel 6 des Brennstoffeinspritzventils 1 ausgestaltet ist, wird durch das Öffnen der Ventilnadel 6 die Ventilnadelverlängerung 15 direkt aus dem Gehäuses 3 herausgeschoben. Somit ist ein einfacher mechanischer Aufbau möglich, da keine Bewegungsumkehrung erforderlich ist.Since the valve needle 6 is designed as an inwardly opening valve needle 6 of the fuel injection valve 1, the valve needle extension 15 is pushed out of the housing 3 directly by opening the valve needle 6. Thus, a simple mechanical construction is possible because no reversal of motion is required.

Die Erfindung ist nicht auf das beschriebene Ausführungsbeispiel beschränkt.The invention is not limited to the embodiment described.

Claims (8)

  1. Fuel injection valve (1) used in particular for fuel injection systems (2) of internal combustion engines, with a housing (3), a valve needle (6) provided in the housing (3) and a fuel inlet (4), characterized in that a valve needle extension (15) is provided which is at least indirectly actuable by the valve needle (6), and in that, by means of an opening stroke of the valve needle (6), the valve needle extension (15) is movable in the region of the fuel inlet (4), wherein the fuel inlet (4) for the fuel injection valve (1) is formed on a connection piece (23) of the fuel distributor (21) and/or on a wall (24) of a fuel distributor (21), and a passage opening (25) is formed in the wall (24) of the fuel distributor (21), and, by means of the opening stroke of the valve needle (6), a valve-needle-remote end (28) of the valve needle extension (15) is movable in and optionally through the passage opening (25) in the wall (24) of the fuel distributor (21).
  2. Fuel injection valve according to Claim 1, characterized in that the fuel inlet (4) is provided at a nozzle-remote end (10) of the housing (3).
  3. Fuel injection valve according to Claim 1 or 2, characterized in that the valve needle extension (15) is directly actuable by the valve needle (6).
  4. Fuel injection valve according to one of Claims 1 to 3, characterized in that a receiving sleeve (20) is provided at a nozzle-remote end (18) of the valve needle (6), in that a valve-needle-close end (17) of the valve needle extension (15) is fitted into the receiving sleeve (20), and in that the valve needle extension (15) is connected via the receiving sleeve (20) to the nozzle-remote end (18) of the valve needle (6).
  5. Fuel injection valve according to one of Claims 1 to 4, characterized in that, by means of the opening stroke of the valve needle (6), the valve needle extension (15) is movable in the region of the fuel inlet (4) in such a manner that a throttling action at the fuel inlet (4) for a fuel guided into the housing (3) via the fuel inlet (4) increases in comparison to a closed position of the valve needle (6).
  6. Fuel injection valve according to Claim 5, characterized in that, in the closed position, the valve needle extension (15) contributes at least virtually nothing to the throttling action at the fuel inlet (4) for the fuel guided into the housing (3) via the fuel inlet (4).
  7. Fuel injection valve according to one of Claims 1 to 6, characterized in that the valve needle extension (15) is at least substantially configured as a pin-shaped valve needle extension (15).
  8. Fuel injection valve according to one of Claims 1 to 7, characterized in that, by means of the opening stroke of the valve needle (6), the valve needle extension (15) is movable in the region of the fuel inlet (4) in such a manner that a valve-needle-remote end (28) of the valve needle extension (15) is pushed out of the housing (3).
EP13765298.8A 2012-11-09 2013-09-09 Fuel injection valve and fuel injection system with a fuel injection valve Not-in-force EP2917556B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102012220491.1A DE102012220491A1 (en) 2012-11-09 2012-11-09 Fuel injection valve and fuel injection system with a fuel injection valve
PCT/EP2013/068560 WO2014072097A1 (en) 2012-11-09 2013-09-09 Fuel injection valve and fuel injection system with a fuel injection valve

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EP2917556A1 EP2917556A1 (en) 2015-09-16
EP2917556B1 true EP2917556B1 (en) 2017-07-26

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EP (1) EP2917556B1 (en)
JP (1) JP6077666B2 (en)
KR (1) KR20150079683A (en)
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DE (1) DE102012220491A1 (en)
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DE102012220491A1 (en) 2014-05-15
KR20150079683A (en) 2015-07-08
CN104769268B (en) 2018-07-31
WO2014072097A1 (en) 2014-05-15
JP6077666B2 (en) 2017-02-08
JP2015532394A (en) 2015-11-09
EP2917556A1 (en) 2015-09-16
CN104769268A (en) 2015-07-08
US20150285199A1 (en) 2015-10-08

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