EP3098434A1 - Fuel injection system - Google Patents

Fuel injection system Download PDF

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Publication number
EP3098434A1
EP3098434A1 EP16166081.6A EP16166081A EP3098434A1 EP 3098434 A1 EP3098434 A1 EP 3098434A1 EP 16166081 A EP16166081 A EP 16166081A EP 3098434 A1 EP3098434 A1 EP 3098434A1
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EP
European Patent Office
Prior art keywords
fuel injection
injection valve
ring seal
holding body
sealing element
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.)
Granted
Application number
EP16166081.6A
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German (de)
French (fr)
Other versions
EP3098434B1 (en
Inventor
Stefan Leiser
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
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Robert Bosch GmbH
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Publication date
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Publication of EP3098434A1 publication Critical patent/EP3098434A1/en
Application granted granted Critical
Publication of EP3098434B1 publication Critical patent/EP3098434B1/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
    • F02M55/004—Joints; Sealings
    • F02M55/005—Joints; Sealings for high pressure conduits, e.g. connected to pump outlet or to injector inlet
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/16—Sealing of fuel injection apparatus not otherwise provided for
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
    • F02M2200/803—Fuel injection apparatus manufacture, repair or assembly using clamp elements and fastening means; e.g. bolts or screws

Definitions

  • the invention relates to a fuel injection valve of an internal combustion engine, wherein the fuel injection valve has a holding body and a nozzle body, wherein the holding body and the nozzle body having a central nozzle needle and / or an actuating rod receiving fuel-filled recess, wherein opposite end faces of the holding body and the nozzle body by means of a union nut against each other are tense.
  • Such a fuel injection valve is out of DE 10 2007 016 866 A1 known.
  • This fuel injection valve has a holding body and a nozzle body, which are clamped together by means of a union nut.
  • a first sealing point between the nozzle body and the holding body is located on an annular surface formed in a reduced width of the holding body.
  • This fuel injection valve is provided for arrangement on a combustion chamber of an internal combustion engine and comprises a holding body, which is braced with a nozzle body by means of a union nut.
  • the nozzle body protrudes into the combustion chamber of the internal combustion engine.
  • an opening is preferably inserted into a cylinder head of an internal combustion engine, into which the nozzle body can be inserted by inserting a sealing element.
  • the sealing element is held on the fuel injection valve in the region below the union nut by means of a securing element.
  • the invention has for its object to provide a fuel injection valve having an improved seal.
  • At least one end face has a groove which includes the recess into which a sealing element is inserted.
  • This sealing element is used in the production or assembly of the fuel injection valve in the groove and ensures after the tension of the holding body with the nozzle body through the union nut to the surrounding tight connection of the components.
  • the fuel injection valve is installed in particular in a common rail injection system, wherein in the fuel injection valve in the region of the fuel-filled recess, the system pressure prevails, which may be up to 3000 bar or more. In this case, the fuel injection valve is designed so that no leakage return line is arranged in the holding body.
  • the groove is an annular groove and the sealing element is an annular sealing element.
  • the sealing element is an annular sealing element. This is the preferred embodiment, which can be easily implemented in terms of manufacturing technology.
  • the sealing element has two annular seals comprising the recess with different properties.
  • the first ring seal difficult to deform or possibly undeformable and the second ring seal deformable, in particular easily deformable.
  • the deformable ring seal is plastically deformed during assembly of the fuel injector during assembly of the holding body and the nozzle body with the union nut and thus reduces the sensitivity of the entire association against relevant influencing factors.
  • the hard deformable or non-deformable annular seal of the annular sealing element produces a defined stop and the exact alignment of the holding body with respect to the nozzle body.
  • the first ring seal comprises the second ring seal.
  • This embodiment has proved to be advantageous, namely by the deformable soft ring seal is covered by the hard, difficult to deform or non-deformable ring seal.
  • the first ring seal on a depth exceeding the groove height. This ensures that the orientation of the holding body relative to the nozzle body is effected by the first ring seal as part of the sealing element.
  • the material of the sealing element is a metal material.
  • the inner and the outer ring seal of the sealing element independent parts that consist of different metal materials.
  • the outer ring seal may be made of (optionally) hardened steel while the inner deformable ring seal is formed of, for example, copper or a material having similar properties.
  • the groove is embedded in the holding body.
  • the holding body is usually made of a less high-quality material than the nozzle body and also the Nozzle body is processed higher overall. Accordingly, the end face of the nozzle body facing the holding body is manufactured with a higher surface quality than is the case with the corresponding end face of the holding body.
  • the groove or the annular groove is incorporated in the holding body, only the bottom surface of the annular groove needs to be made with a high surface quality to ensure overall that a dressing consisting of the holding body and the nozzle body is created by the use of the sealing element which is exactly aligned with each other and has the desired improved seal.
  • FIG. 1 shows a partial section through a fuel injection valve in the region of the interaction of a holding body 1 and a nozzle body 3 during assembly.
  • the fuel injection valve is used in particular for injecting diesel fuel into a combustion chamber of an internal combustion engine, which then burns in the combustion chamber to generate work output with combustion air introduced into the combustion chamber at the same time.
  • the fuel injection valve is preferably part of a common-rail fuel injection system, wherein the fuel injection system is supplied in a high-pressure accumulator under a pressure of up to 3,000 bar or more stored fuel for injection.
  • the fuel injection valve has the said holding body 1, in which an actuator, For example, a piezoelectric actuator, for controlling a nozzle needle 2 or an actuating rod for the nozzle needle 2 is arranged.
  • the nozzle needle 2 is guided in the nozzle body 3, wherein the guide portion is not shown in the figure.
  • a nozzle needle tip of the nozzle needle 2 closes injection ports in the nozzle body 3, while in an opening state of the fuel injection valve, the nozzle needle 2 is axially displaced toward the holder body 1 and then the nozzle needle tip releases the injection ports.
  • pending fuel can be injected through the injection openings in the combustion chamber of the internal combustion engine.
  • the closing movement of the nozzle needle 2 is assisted by a nozzle needle spring 4, which is supported on the holding body 1 or a retaining washer arranged between the holding body 1 and the nozzle body 3.
  • a nozzle body 2 receiving holding body space 5 in the holder body 1 and the nozzle needle spring 4 and the nozzle needle 2 receiving spring chamber 6 in the nozzle body 3 are fuel-filled, wherein the pending fuel pressure corresponds to the system pressure of the fuel injection system.
  • the union nut 3 is pushed from below over the nozzle body 3, for example until the investment of a shoulder of the union nut on an annular shoulder of the nozzle body 3, not shown, and screwed with an internal thread 11 on an attached to the holder body 1 external thread 12.
  • the holding body 1 can be reliably connected to the nozzle body 3.
  • annular groove 13 is recessed surrounding the holding body space 5.
  • the ring sealing element 14 has a first, outer ring seal 15a and a second, inner ring seal 15b.
  • the first, outer ring seal 15a is made of a metal material that is difficult to deform or deform, while the second, inner ring seal 15b is made of a soft, preferably easily deformable metal material.
  • the height of the second inner ring seal 15b is in the in FIG. 1
  • the height of the first, outer ring seal 15a is slightly larger than the depth of the annular groove 13th
  • FIG. 2 is the fully assembled fuel injection valve with the finished bolted composite consisting of holding body 1, nozzle body 3 and union nut 8 shown.
  • the second, inner ring seal 15b of the sealing element 14 has deformed so far that the height of this second, inner ring seal 15b is equal to the height of the first, outer ring seal 15a and thus there is a reliable seal and accurate alignment of the aforementioned components to each other.
  • the height of the first, outer ring seal 15a is dimensioned such that there is still a small gap 17 in the region of the opposite end faces 7a, 7b between the holding body 1 and the nozzle body 3.
  • the ring sealing element 14 with the first, outer ring seal 15a and the second, inner ring seal 15b preferably consists of two parts, which are connected to each other in a pre-assembly, for example by inserting the inner ring seal 15b in the outer ring seal 15a, so that in the actual assembly of the fuel injection valve only the prefabricated ring sealing element 14 must be mounted.

Abstract

Die Erfindung betrifft ein Kraftstoffeinspritzventil einer Brennkraftmaschine, wobei das Kraftstoffeinspritzventil einen Haltekörper 1 und einen Düsenkörper 3 aufweist, wobei der Haltekörper 1 und der Düsenkörper 3 eine zentrale eine Düsennadel 2 und/oder eine Betätigungsstange aufnehmende kraftstoffgefüllte Ausnehmung aufweisen, wobei gegenüberliegende Stirnflächen 7a, 7b des Haltekörpers 1 und des Düsenkörpers 3 mittels einer Überwurfmutter 8 gegeneinander verspannt sind. Erfindungsgemäß wird ein Kraftstoffeinspritzventil bereitgestellt, das eine verbesserte Abdichtung zur Umgebung aufweist. Erreicht wird dies dadurch, dass zumindest eine der Stirnflächen 7a, 7b eine die Ausnehmung umfassende Nut aufweist, in die ein Ringdichtelement 14 eingesetzt ist. Das Ringdichtelement 14 besteht aus einer äußerem und einer inneren Ringdichtung 15a, 15b, die unterschiedliche Eigenschaften aufweisen.The invention relates to a fuel injection valve of an internal combustion engine, wherein the fuel injection valve has a holding body 1 and a nozzle body 3, the holding body 1 and the nozzle body 3 having a central nozzle needle 2 and / or an actuating rod receiving fuel-filled recess, with opposite end faces 7a, 7b of Holding body 1 and the nozzle body 3 are braced against each other by means of a union nut 8. According to the invention, a fuel injection valve is provided, which has an improved seal to the environment. This is achieved in that at least one of the end faces 7a, 7b has a groove which comprises the recess, into which an annular sealing element 14 is inserted. The ring sealing member 14 is composed of outer and inner ring seals 15a, 15b having different properties.

Description

Die Erfindung betrifft ein Kraftstoffeinspritzventil einer Brennkraftmaschine, wobei das Kraftstoffeinspritzventil einen Haltekörper und einen Düsenkörper aufweist, wobei der Haltekörper und der Düsenkörper eine zentrale eine Düsennadel und/oder eine Betätigungsstange aufnehmende kraftstoffgefüllte Ausnehmung aufweisen, wobei gegenüberliegende Stirnflächen des Haltekörpers und des Düsenkörpers mittels einer Überwurfmutter gegeneinander verspannt sind.The invention relates to a fuel injection valve of an internal combustion engine, wherein the fuel injection valve has a holding body and a nozzle body, wherein the holding body and the nozzle body having a central nozzle needle and / or an actuating rod receiving fuel-filled recess, wherein opposite end faces of the holding body and the nozzle body by means of a union nut against each other are tense.

Stand der TechnikState of the art

Ein derartiges Kraftstoffeinspritzventil ist aus der DE 10 2007 016 866 A1 bekannt. Dieses Kraftstoffeinspritzventil weist einen Haltekörper und einen Düsenkörper auf, die miteinander mittels einer Überwurfmutter verspannt sind. Dabei liegt eine erste Dichtstelle zwischen dem Düsenkörper und dem Haltekörper an einer in einer reduzierter Breite ausgebildeten Ringfläche des Haltekörpers.Such a fuel injection valve is out of DE 10 2007 016 866 A1 known. This fuel injection valve has a holding body and a nozzle body, which are clamped together by means of a union nut. In this case, a first sealing point between the nozzle body and the holding body is located on an annular surface formed in a reduced width of the holding body.

Ein weiteres Einspritzventil ist aus der DE 10 2005 053 112 A1 bekannt. Dieses Kraftstoffeinspritzventil ist zur Anordnung an einem Brennraum einer Brennkraftmaschine vorgesehen und umfasst einen Haltekörper, der mit einem Düsenkörper mittels einer Überwurfmutter verspannt ist. Der Düsenkörper ragt in den Brennraum der Brennkraftmaschine hinein. Dazu ist vorzugsweise in einen Zylinderkopf einer Brennkraftmaschine eine Öffnung eingelassen, in die der Düsenkörper unter Einfügung eines Dichtelements einsetzbar ist. Das Dichtelement wird an dem Kraftstoffeinspritzventil im Bereich unterhalb der Überwurfmutter mittels eines Sicherungselements gehalten.Another injector is out of the DE 10 2005 053 112 A1 known. This fuel injection valve is provided for arrangement on a combustion chamber of an internal combustion engine and comprises a holding body, which is braced with a nozzle body by means of a union nut. The nozzle body protrudes into the combustion chamber of the internal combustion engine. For this purpose, an opening is preferably inserted into a cylinder head of an internal combustion engine, into which the nozzle body can be inserted by inserting a sealing element. The sealing element is held on the fuel injection valve in the region below the union nut by means of a securing element.

Der Erfindung liegt die Aufgabe zugrunde, ein Kraftstoffeinspritzventil bereitzustellen, das eine verbesserte Abdichtung aufweist.The invention has for its object to provide a fuel injection valve having an improved seal.

Diese Aufgabe wird dadurch gelöst, dass zumindest eine Stirnfläche eine die Ausnehmung umfassende Nut aufweist, in die ein Dichtelement eingesetzt ist. Dieses Dichtelement wird bei der Herstellung beziehungsweise Montage des Kraftstoffeinspritzventils in die Nut eingesetzt und gewährleistet nach der Verspannung des Haltekörpers mit dem Düsenkörper durch die Überwurfmutter eine zur Umgebung dichte Verbindung der Komponenten. Das Kraftstoffeinspritzventil ist insbesondere bei einem Common-Rail-Einspritzsystem verbaut, wobei in dem Kraftstoffeinspritzventil im Bereich der kraftstoffgefüllten Ausnehmung der Systemdruck herrscht, der bis zu 3000 bar oder mehr betragen kann. Dabei ist das Kraftstoffeinspritzventil so ausgebildet, dass keine Leckagerückführleitung in den Haltekörper angeordnet ist. Durch die Leckagerückführleitung war es bei bisherigen Kraftstoffeinspritzventilen möglich, im Bereich der gegenseitigen Stirnflächen des Haltkörpers und des Düsenkörpers anfallenden Leckagekraftstoff aufzufangen und abzuführen. Die Serienerfahrung hat nun gezeigt, dass sehr viele Faktoren, wie beispielsweise die Montage, Schmutzpartikel, verschiedenste Oberflächenparameter, Einfluss auf die Dichtfähigkeit des Kraftstoffeinspritzventils haben. Dadurch sind die entsprechenden Anforderungen an die Fertigung der einzelnen Komponenten des Kraftstoffeinspritzventils, die Montage des Kraftstoffeinspritzventils und die Sauberkeit bei der Montage sehr hoch. Durch die erfindungsgemäße Ausgestaltung des Kraftstoffeinspritzventils wird eine verbesserte Abdichtung erreicht und damit auch die Robustheit des Verbandes, bestehend aus dem Düsenkörper und dem Haltekörper gesteigert.This object is achieved in that at least one end face has a groove which includes the recess into which a sealing element is inserted. This sealing element is used in the production or assembly of the fuel injection valve in the groove and ensures after the tension of the holding body with the nozzle body through the union nut to the surrounding tight connection of the components. The fuel injection valve is installed in particular in a common rail injection system, wherein in the fuel injection valve in the region of the fuel-filled recess, the system pressure prevails, which may be up to 3000 bar or more. In this case, the fuel injection valve is designed so that no leakage return line is arranged in the holding body. Through the leakage return line, it was possible in previous fuel injection valves to absorb and discharge resulting leakage fuel in the region of the mutual end faces of the holding body and the nozzle body. Series experience has now shown that a large number of factors, such as assembly, dirt particles, various surface parameters, have an influence on the sealing capability of the fuel injection valve. As a result, the corresponding requirements for the production of the individual components of the fuel injection valve, the assembly of the fuel injection valve and the cleanliness during assembly are very high. The embodiment of the fuel injection valve according to the invention achieves an improved seal and thus also increases the robustness of the dressing, consisting of the nozzle body and the holding body.

In Weiterbildung der Erfindung ist die Nut eine Ringnut und das Dichtelement ein Ringdichtelement. Dies ist die bevorzugte Ausgestaltung, die sich fertigungstechnisch einfach umsetzen lässt. Zudem ist durch die ringförmige Ausgestaltung der Nut und des Dichtelements sichergestellt, dass die Krafteinwirkung auf den Umfangsbereich des Dichtelements zumindest angenähert gleich ist. Auch dadurch wird die Abdichtung verbessert.In a further development of the invention, the groove is an annular groove and the sealing element is an annular sealing element. This is the preferred embodiment, which can be easily implemented in terms of manufacturing technology. In addition, it is ensured by the annular configuration of the groove and the sealing element that the force on the peripheral region of the sealing element is at least approximately equal. This also improves the seal.

In weiterer Ausgestaltung der Erfindung weist das Dichtelement zwei die Ausnehmung umfassende Ringdichtungen mit unterschiedlichen Eigenschaften auf. Dies ist eine besonders vorteilhafte Ausgestaltung, mit der die Dichtwirkung weiter verbessert werden kann. Dabei ist in weiterer Ausgestaltung die erste Ringdichtung schwer verformbar oder gegebenenfalls unverformbar und die zweite Ringdichtung verformbar, insbesondere leicht verformbar. Die verformbare Ringdichtung wird bei der Montage des Kraftstoffeinspritzventils beim Zusammenbau des Haltekörpers und des Düsenkörpers mit der Überwurfmutter plastisch verformt und reduziert somit die Sensibilität des gesamten Verbandes gegen relevante Einflussfaktoren. Die schwer verformbare beziehungsweise unverformbare Ringdichtung des Ringdichtelements stellt einen definierten Anschlag und die exakte Ausrichtung des Haltekörpers gegenüber dem Düsenkörper her.In a further embodiment of the invention, the sealing element has two annular seals comprising the recess with different properties. This is a particularly advantageous embodiment, with which the sealing effect can be further improved. In this case, in a further embodiment, the first ring seal difficult to deform or possibly undeformable and the second ring seal deformable, in particular easily deformable. The deformable ring seal is plastically deformed during assembly of the fuel injector during assembly of the holding body and the nozzle body with the union nut and thus reduces the sensitivity of the entire association against relevant influencing factors. The hard deformable or non-deformable annular seal of the annular sealing element produces a defined stop and the exact alignment of the holding body with respect to the nozzle body.

In Weiterbildung der Erfindung umfasst die erste Ringdichtung die zweite Ringdichtung. Diese Ausgestaltung hat sich als vorteilhaft erwiesen, indem nämlich die verformbare weiche Ringdichtung von der harten, schwer verformbaren beziehungsweise unverformbaren Ringdichtung umfasst wird.In a further development of the invention, the first ring seal comprises the second ring seal. This embodiment has proved to be advantageous, namely by the deformable soft ring seal is covered by the hard, difficult to deform or non-deformable ring seal.

In weiterer Ausgestaltung der Erfindung weist die erste Ringdichtung eine die Tiefe der Nut übersteigende Höhe auf. Dadurch ist sichergestellt, dass die Ausrichtung des Haltekörpers gegenüber dem Düsenkörper durch die erste Ringdichtung als Bestandteil des Dichtelements erfolgt.In a further embodiment of the invention, the first ring seal on a depth exceeding the groove height. This ensures that the orientation of the holding body relative to the nozzle body is effected by the first ring seal as part of the sealing element.

In Weiterbildung der Erfindung ist der Werkstoff des Dichtelements ein Metallwerkstoff. Dabei sind wiederum in weiterer Ausgestaltung der Erfindung die innere und die äußere Ringdichtung des Dichtelements eigenständige Teile, die aus unterschiedlichen Metallwerkstoffen bestehen. Beispielsweise kann die äußere Ringdichtung aus einem (gegebenenfalls) gehärteten Stahl gefertigt sein, während die innere verformbare Ringdichtung beispielsweise aus Kupfer oder einem Material mit ähnlichen Eigenschaften ausgebildet ist.In a further development of the invention, the material of the sealing element is a metal material. Again, in a further embodiment of the invention, the inner and the outer ring seal of the sealing element independent parts that consist of different metal materials. For example, the outer ring seal may be made of (optionally) hardened steel while the inner deformable ring seal is formed of, for example, copper or a material having similar properties.

In weiterer Ausgestaltung der Erfindung ist die Nut in den Haltekörper eingelassen. Dies ist vorteilhaft, weil der Haltekörper normalerweise aus einem weniger hochwertigen Material als der Düsenkörper gefertigt ist und auch der Düsenkörper insgesamt höherwertig bearbeitet ist. Dementsprechend ist die zu dem Haltekörper weisende Stirnfläche des Düsenkörpers mit einer höheren Oberflächengüte gefertigt als dies bei der korrespondierenden Stirnfläche des Haltekörpers der Fall ist. Dadurch, dass die Nut beziehungsweise die Ringnut in den Haltekörper eingearbeitet ist, braucht nur die Bodenfläche der Ringnut mit einer hohen Oberflächengute gefertigt zu werden, um insgesamt sicherzustellen, dass durch den Einsatz des Dichtelements ein Verband, bestehend aus dem Haltekörper und dem Düsenkörper geschaffen ist, der exakt zueinander ausgerichtet ist und die gewünschte verbesserte Abdichtung aufweist.In a further embodiment of the invention, the groove is embedded in the holding body. This is advantageous because the holding body is usually made of a less high-quality material than the nozzle body and also the Nozzle body is processed higher overall. Accordingly, the end face of the nozzle body facing the holding body is manufactured with a higher surface quality than is the case with the corresponding end face of the holding body. Characterized in that the groove or the annular groove is incorporated in the holding body, only the bottom surface of the annular groove needs to be made with a high surface quality to ensure overall that a dressing consisting of the holding body and the nozzle body is created by the use of the sealing element which is exactly aligned with each other and has the desired improved seal.

Weitere vorteilhafte Ausgestaltungen der Erfindung sind der Zeichnungsbeschreibung zu entnehmen, in der ein in den Figuren dargestelltes Ausführungsbeispiel der Erfindung näher beschrieben ist.Further advantageous embodiments of the invention are described in the drawings, in which an illustrated in the figures embodiment of the invention is described in detail.

Es zeigen:

Figur 1
einen teilweisen Schnitt durch ein Kraftstoffeinspritzventil im Bereich des Zusammenwirkens eines Haltekörpers und eines Düsenkörpers während der Montage und
Figur 2
einen teilweisen Schnitt durch ein Kraftstoffeinspritzventil im Bereich des Zusammenwirkens eines Haltekörpers und eines Düsenkörpers nach Abschluss der Montage.
Show it:
FIG. 1
a partial section through a fuel injection valve in the region of the interaction of a holding body and a nozzle body during assembly and
FIG. 2
a partial section through a fuel injection valve in the region of the interaction of a holding body and a nozzle body after completion of the assembly.

Figur 1 zeigt einen teilweisen Schnitt durch ein Kraftstoffeinspritzventil im Bereich des Zusammenwirkens eines Haltekörpers 1 und eines Düsenkörpers 3 während der Montage. Das Kraftstoffeinspritzventil wird insbesondere zum Einspritzen von Dieselkraftstoff in einen Brennraum einer Brennkraftmaschine genutzt, der dann in dem Brennraum zur Erzeugung von Arbeitsleistung mit gleichzeitig in den Brennraum eingebrachter Brennluft verbrennt. Dabei ist das Kraftstoffeinspritzventil bevorzugt Teil eines Common-Rail-Kraftstoffeinspritzsystems, wobei dem Kraftstoffeinspritzsystem in einem Hochdruckspeicher unter einem Druck von bis zu 3.000 bar oder mehr gespeicherter Kraftstoff zur Einspritzung zugeführt wird. Das Kraftstoffeinspritzventil weist den genannten Haltekörper 1 auf, in dem ein Aktor, beispielsweise ein Piezoaktor, zur Steuerung einer Düsennadel 2 oder einer Betätigungsstange für die Düsennadel 2 angeordnet ist. Die Düsennadel 2 ist in dem Düsenkörper 3 geführt, wobei der Führungsbereich in der Figur nicht dargestellt ist. In einem Schließzustand des Kraftstoffeinspritzsystems verschließt eine Düsennadelspitze der Düsennadel 2 Einspritzöffnungen in dem Düsenkörper 3, während in einem Öffnungszustand des Kraftstoffeinspritzventils die Düsennadel 2 axial in Richtung zu dem Haltekörper 1 verstellt ist und dann die Düsennadelspitze die Einspritzöffnungen freigibt. In diesem Zustand kann anstehender Kraftstoff durch die Einspritzöffnungen in den Brennraum der Brennkraftmaschine eingespritzt werden. Die Schließbewegung der Düsennadel 2 wird von einer Düsennadelfeder 4 unterstützt, die sich an dem Haltekörper 1 oder einer zwischen dem Haltekörper 1 und dem Düsenkörper 3 angeordneten Haltescheibe abstützt. Ein die Düsennadel 2 aufnehmender Haltekörperraum 5 in dem Haltekörper 1 und die Düsennadelfeder 4 sowie die Düsennadel 2 aufnehmender Federraum 6 in dem Düsenkörper 3 sind kraftstoffgefüllt, wobei der anstehende Kraftstoffdruck dem Systemdruck des Kraftstoffeinspritzsystems entspricht. FIG. 1 shows a partial section through a fuel injection valve in the region of the interaction of a holding body 1 and a nozzle body 3 during assembly. The fuel injection valve is used in particular for injecting diesel fuel into a combustion chamber of an internal combustion engine, which then burns in the combustion chamber to generate work output with combustion air introduced into the combustion chamber at the same time. In this case, the fuel injection valve is preferably part of a common-rail fuel injection system, wherein the fuel injection system is supplied in a high-pressure accumulator under a pressure of up to 3,000 bar or more stored fuel for injection. The fuel injection valve has the said holding body 1, in which an actuator, For example, a piezoelectric actuator, for controlling a nozzle needle 2 or an actuating rod for the nozzle needle 2 is arranged. The nozzle needle 2 is guided in the nozzle body 3, wherein the guide portion is not shown in the figure. In a closed state of the fuel injection system, a nozzle needle tip of the nozzle needle 2 closes injection ports in the nozzle body 3, while in an opening state of the fuel injection valve, the nozzle needle 2 is axially displaced toward the holder body 1 and then the nozzle needle tip releases the injection ports. In this state, pending fuel can be injected through the injection openings in the combustion chamber of the internal combustion engine. The closing movement of the nozzle needle 2 is assisted by a nozzle needle spring 4, which is supported on the holding body 1 or a retaining washer arranged between the holding body 1 and the nozzle body 3. A nozzle body 2 receiving holding body space 5 in the holder body 1 and the nozzle needle spring 4 and the nozzle needle 2 receiving spring chamber 6 in the nozzle body 3 are fuel-filled, wherein the pending fuel pressure corresponds to the system pressure of the fuel injection system.

Um gegenüberliegende axiale Stirnflächen 7a, 7b des Haltekörpers 1 und des Düsenkörpers 3 zur Umgebung flüssigkeitsdicht abzudichten, ist ein erfindungsgemäß ausgebildetes Dichtsystem vorgesehen, das nachfolgend beschrieben wird. Hierbei ist zu berücksichtigen, dass der Düsenkörper 3 mittels einer Überwurfmutter 8 mit dem Haltekörper 1 verschraubbar ist. Dabei ist der Bereich des Zusammenwirkens der Überwurfmutter 8 mit dem Haltekörper 1 und dem Düsenkörper 3 nicht flüssigkeitsdicht und es ist in diesem Bereich auch keine Leckageleitung vorgesehen, die Leckagekraftstoff abführen könnte. Die Überwurfmutter 3 wird von unten über den Düsenkörper 3 beispielsweise bis zur Anlage einer Schulter der Überwurfmutter an einem nicht dargestellten ringförmigen Absatz des Düsenkörpers 3 angeschoben und mit einem Innengewinde 11 auf ein an dem Haltekörper 1 angebrachtes Außengewinde 12 aufgeschraubt. Somit kann der Haltekörper 1 mit dem Düsenkörper 3 zuverlässig verbunden werden.To seal liquid-tight opposite axial end faces 7a, 7b of the holding body 1 and the nozzle body 3 to the environment, an inventively designed sealing system is provided, which will be described below. It should be noted that the nozzle body 3 by means of a union nut 8 with the holding body 1 is screwed. In this case, the area of interaction of the union nut 8 with the holding body 1 and the nozzle body 3 is not liquid-tight and there is no leakage line provided in this area, which could dissipate leakage fuel. The union nut 3 is pushed from below over the nozzle body 3, for example until the investment of a shoulder of the union nut on an annular shoulder of the nozzle body 3, not shown, and screwed with an internal thread 11 on an attached to the holder body 1 external thread 12. Thus, the holding body 1 can be reliably connected to the nozzle body 3.

In den Haltekörper 1 ist eine Ringnut 13 den Haltekörperraum 5 umgebend eingelassen. In die Ringnut 13 ist ein Dichtelement in Form eines Ringdichtelements 14 eingesetzt. Das Ringdichtelement 14 weist eine erste, äußere Ringdichtung 15a und eine zweite, innere Ringdichtung 15b auf. Die erste, äußere Ringdichtung 15a ist aus einem schwer verformbaren oder unverformbaren Metallwerkstoff gefertigt, während die zweite, innere Ringdichtung 15b aus einem weichen, vorzugsweise leicht verformbaren Metallwerkstoff gefertigt ist. Die Höhe der zweiten, inneren Ringdichtung 15b ist in der in Figur 1 dargestellten Montagegrundstellung größer als die Höhe der zweiten, äußeren Ringdichtung 15a des Ringdichtelements 14. Zudem ist die Höhe der ersten, äußeren Ringdichtung 15a geringfügig größer als die Tiefe der Ringnut 13.In the holding body 1, an annular groove 13 is recessed surrounding the holding body space 5. In the annular groove 13 is a sealing element in the form of a Ring sealing element 14 used. The ring sealing element 14 has a first, outer ring seal 15a and a second, inner ring seal 15b. The first, outer ring seal 15a is made of a metal material that is difficult to deform or deform, while the second, inner ring seal 15b is made of a soft, preferably easily deformable metal material. The height of the second inner ring seal 15b is in the in FIG. 1 In addition, the height of the first, outer ring seal 15a is slightly larger than the depth of the annular groove 13th

Durch diese Ausgestaltung wird folgendes erreicht:

  • Während der Montage des Kraftstoffeinspritzventils beziehungsweise das Aufschrauben der Überwurfmutter 8 auf den Haltekörper 1 wird der Düsenkörper 3 zunehmend gegen den Haltekörper 1 im Bereich der gegenüberliegenden Stirnflächen 7a, 7b zwischen den beiden Bauteilen gepresst. Dadurch wird die zweite, innere Ringdichtung 15b des Ringdichtelements 14 zunehmend plastisch verformt, wobei der Grad der Verformung durch die Höhe der ersten, äußeren Ringdichtung 15a des Ringdichtelements 14 festgelegt wird. Die erste, äußere Ringdichtung 15a sorgt aufgrund ihrer schweren Verformbarkeit beziehungsweise ihrer Unverformbarkeit für eine definierte Ausrichtung und die exakte Verbindung von dem Haltekörper 1 zu dem beziehungsweise mit dem Düsenkörper 3. Dabei ist zumindest die Bodenfläche 16 der Ringnut 13 sowie die gegenüberliegende Stirnfläche 7b des Düsenkörpers 3 mit einer hohen Oberflächengüte gefertigt, um eine gute Dichtwirkung und eine exakte Ausrichtung des Haltekörpers 1 zu dem Düsenkörper 3 zu gewährleisten. Zusätzlich wird dieser Bereich vor der Montage gründlich gereinigt und gegebenenfalls kann die Bodenfläche 16 und die Stirnfläche 7b zusätzlich mit einer Dichtpaste bestrichen sein.
By this embodiment, the following is achieved:
  • During assembly of the fuel injection valve or the screwing of the union nut 8 on the holding body 1, the nozzle body 3 is increasingly pressed against the holding body 1 in the region of the opposite end faces 7a, 7b between the two components. Thereby, the second, inner ring seal 15b of the ring seal member 14 is increasingly plastically deformed, the degree of deformation being determined by the height of the first, outer ring seal 15a of the ring seal member 14. The first, outer ring seal 15a ensures due to their heavy deformability or their deformability for a defined orientation and the exact connection of the holding body 1 to or with the nozzle body 3. Here, at least the bottom surface 16 of the annular groove 13 and the opposite end face 7b of the nozzle body 3 manufactured with a high surface quality in order to ensure a good sealing effect and precise alignment of the holding body 1 to the nozzle body 3. In addition, this area is thoroughly cleaned before installation and, if necessary, the bottom surface 16 and the end face 7b may additionally be coated with a sealing paste.

In Figur 2 ist das fertig montierte Kraftstoffeinspritzventil mit dem fertig verschraubten Verbund bestehend aus Haltekörper 1, Düsenkörper 3 und Überwurfmutter 8 dargestellt. Die zweite, innere Ringdichtung 15b des Dichtelements 14 hat sich soweit verformt, dass die Höhe von dieser zweiten, inneren Ringdichtung 15b gleich der Höhe der ersten, äußeren Ringdichtung 15a ist und somit eine zuverlässige Abdichtung und genaue Ausrichtung der zuvor genannten Bauteile zueinander besteht. Die Höhe der ersten, äußeren Ringdichtung 15a ist so bemessen, dass noch ein geringer Spalt 17 im Bereich der gegenüberliegenden Stirnflächen 7a, 7b zwischen dem Haltekörper 1 und dem Düsenkörper 3 besteht.In FIG. 2 is the fully assembled fuel injection valve with the finished bolted composite consisting of holding body 1, nozzle body 3 and union nut 8 shown. The second, inner ring seal 15b of the sealing element 14 has deformed so far that the height of this second, inner ring seal 15b is equal to the height of the first, outer ring seal 15a and thus there is a reliable seal and accurate alignment of the aforementioned components to each other. The height of the first, outer ring seal 15a is dimensioned such that there is still a small gap 17 in the region of the opposite end faces 7a, 7b between the holding body 1 and the nozzle body 3.

Das Ringdichtelement 14 mit der ersten, äußeren Ringdichtung 15a und der zweiten, inneren Ringdichtung 15b besteht vorzugsweise aus zwei Teilen, die in einer Vormontage miteinander beispielsweise durch Einstecken der inneren Ringdichtung 15b in die äußere Ringdichtung 15a miteinander verbunden werden, so dass bei der eigentlichen Montage des Kraftstoffeinspritzventils nur das so vorgefertigte Ringdichtelement 14 montiert werden muss.The ring sealing element 14 with the first, outer ring seal 15a and the second, inner ring seal 15b preferably consists of two parts, which are connected to each other in a pre-assembly, for example by inserting the inner ring seal 15b in the outer ring seal 15a, so that in the actual assembly of the fuel injection valve only the prefabricated ring sealing element 14 must be mounted.

Claims (10)

Kraftstoffeinspritzventil einer Brennkraftmaschine, wobei das Kraftstoffeinspritzventil einen Haltekörper (1) und einen Düsenkörper (3) aufweist, wobei der Haltekörper (1) und der Düsenkörper (3) eine zentrale eine Düsennadel (2) und/oder eine Betätigungsstange aufnehmende kraftstoffgefüllte Ausnehmung aufweisen, wobei gegenüberliegende Stirnflächen (7a, 7b) des Haltekörpers (1) und des Düsenkörpers (3) mittels einer Überwurfmutter (8) gegeneinander verspannt sind,
dadurch gekennzeichnet, dass zumindest eine Stirnfläche (7a, 7b) eine die Ausnehmung umfassende Nut aufweist, in die ein Dichtelement eingesetzt ist.A fuel injection valve of an internal combustion engine, wherein the fuel injection valve has a holding body (1) and a nozzle body (3), wherein the holding body (1) and the nozzle body (3) have a central fuel nozzle filled with a nozzle needle (2) and / or an actuating rod, wherein opposite end faces (7a, 7b) of the holding body (1) and the nozzle body (3) by means of a union nut (8) are braced against each other,
characterized in that at least one end face (7a, 7b) has a groove comprising the recess into which a sealing element is inserted. Kraftstoffeinspritzventil nach Anspruch 1,
dadurch gekennzeichnet, dass die Nut eine Ringnut (13) und das Dichtelement ein Ringdichtelement (14) ist.Fuel injection valve according to claim 1,
characterized in that the groove is an annular groove (13) and the sealing element is an annular sealing element (14). Kraftstoffeinspritzventil nach Anspruch 1 oder 2,
dadurch gekennzeichnet, dass das Dichtelement zwei Ringdichtungen (15a, 15b) mit unterschiedlichen Eigenschaften aufweist.Fuel injection valve according to Claim 1 or 2,
characterized in that the sealing element has two ring seals (15a, 15b) with different properties. Kraftstoffeinspritzventil nach Anspruch 3,
dadurch gekennzeichnet, dass die erste Ringdichtung (15a) unverformbar oder zumindest angenähert unverformbar und die zweite Ringdichtung (15b) verformbar ist.Fuel injection valve according to claim 3,
characterized in that the first ring seal (15a) is deformable or at least approximately undeformable and the second ring seal (15b) is deformable. Kraftstoffeinspritzventil nach Anspruch 4,
dadurch gekennzeichnet, dass die erste Ringdichtung (15a) die zweite Ringdichtung (15b) umfasst.Fuel injection valve according to claim 4,
characterized in that the first ring seal (15a) comprises the second ring seal (15b). Kraftstoffeinspritzventil nach Anspruch 4 oder 5,
dadurch gekennzeichnet, dass die erste Ringdichtung (15a) eine die Tiefe der Nut übersteigende Höhe aufweist.Fuel injection valve according to claim 4 or 5,
characterized in that the first ring seal (15a) has a depth exceeding the groove height. Kraftstoffeinspritzventil nach einem der Ansprüche 4 bis 6,
dadurch gekennzeichnet, dass die zweite Ringdichtung (15b) eine die Höhe der ersten Ringdichtung (15a) übersteigende Höhe aufweist.Fuel injection valve according to one of claims 4 to 6,
characterized in that the second ring seal (15b) has a height exceeding the height of the first ring seal (15a). Kraftstoffeinspritzventil nach einem der vorherigen Ansprüche,
dadurch gekennzeichnet, dass der Werkstoff des Dichtelements ein Metallwerkstoff ist.Fuel injection valve according to one of the preceding claims,
characterized in that the material of the sealing element is a metal material. Kraftstoffeinspritzventil nach einem der vorherigen Ansprüche,
dadurch gekennzeichnet, dass die innere und die äußere Ringdichtung (15a, 15b) eigenständige Teile sind.Fuel injection valve according to one of the preceding claims,
characterized in that the inner and outer ring seals (15a, 15b) are independent parts. Kraftstoffeinspritzventil nach einem der vorherigen Ansprüche,
dadurch gekennzeichnet, dass die Nut in den Haltekörper (1) eingelassen ist.Fuel injection valve according to one of the preceding claims,
characterized in that the groove in the holding body (1) is embedded.
EP16166081.6A 2015-05-29 2016-04-19 Fuel injection system Not-in-force EP3098434B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102015209956.3A DE102015209956A1 (en) 2015-05-29 2015-05-29 Fuel injection system

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EP3098434A1 true EP3098434A1 (en) 2016-11-30
EP3098434B1 EP3098434B1 (en) 2018-10-03

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ID=55759566

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DE (1) DE102015209956A1 (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1245826A2 (en) * 2001-03-28 2002-10-02 Robert Bosch Gmbh Sealing for a high-pressure fuel system of an internal combustion engine
DE10229899A1 (en) * 2002-07-03 2004-01-29 Siemens Ag Process for producing a seal on an injector and injector with improved high-pressure seal
DE102005053112A1 (en) 2005-11-08 2007-05-10 Robert Bosch Gmbh Fuel injection valve with fuse for a valve-combustion chamber sealing element
DE102007016866A1 (en) 2007-04-10 2008-10-16 Robert Bosch Gmbh High-density fuel injector, has throttle plate surrounded by retaining body of fuel injector, where luggage compartment and control chamber stand in hydraulic connection with each other over throttle plate

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1245826A2 (en) * 2001-03-28 2002-10-02 Robert Bosch Gmbh Sealing for a high-pressure fuel system of an internal combustion engine
DE10229899A1 (en) * 2002-07-03 2004-01-29 Siemens Ag Process for producing a seal on an injector and injector with improved high-pressure seal
DE102005053112A1 (en) 2005-11-08 2007-05-10 Robert Bosch Gmbh Fuel injection valve with fuse for a valve-combustion chamber sealing element
DE102007016866A1 (en) 2007-04-10 2008-10-16 Robert Bosch Gmbh High-density fuel injector, has throttle plate surrounded by retaining body of fuel injector, where luggage compartment and control chamber stand in hydraulic connection with each other over throttle plate

Also Published As

Publication number Publication date
EP3098434B1 (en) 2018-10-03
DE102015209956A1 (en) 2016-12-01

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