EP3380716B1 - Fuel injector comprising a sealing element - Google Patents

Fuel injector comprising a sealing element Download PDF

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Publication number
EP3380716B1
EP3380716B1 EP16777656.6A EP16777656A EP3380716B1 EP 3380716 B1 EP3380716 B1 EP 3380716B1 EP 16777656 A EP16777656 A EP 16777656A EP 3380716 B1 EP3380716 B1 EP 3380716B1
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EP
European Patent Office
Prior art keywords
sealing element
fuel injector
sealing
injector according
regions
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EP16777656.6A
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German (de)
French (fr)
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EP3380716A1 (en
Inventor
Stefan Leiser
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Robert Bosch GmbH
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Robert Bosch GmbH
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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
    • F02M55/004—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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/26—Fuel-injection apparatus with elastically deformable elements other than coil springs
    • 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
    • F02M2547/00—Special features for fuel-injection valves actuated by fluid pressure
    • F02M2547/003—Valve inserts containing control chamber and valve piston

Definitions

  • the invention relates to a fuel injector using a sealing element for a high-pressure connection.
  • a sealing element for a fuel injector according to the preamble of claim 1 is known from the DE 102012 222 167 A1 known to the applicant.
  • a high-pressure line to a connection piece in a fuel injector can be sealed by means of the known sealing element.
  • the high-pressure line and the connecting piece are axially clamped to one another by means of a union nut, the sealing element being arranged within bores of the two axially spaced apart components (high-pressure line and connecting piece).
  • the sealing element deforms radially outward and lies with an outer side or an outer circumference, forming a seal, at the mouth regions of the two through bores of the two components.
  • the sealing element has a radially outwardly projecting sealing area in a region that is axially central with respect to a longitudinal axis of the sealing element and that, when the sealing element is not yet axially loaded, has an outer diameter that is larger than the diameter of the bores on the High pressure line and the connecting piece. In the axially clamped state of the sealing element, it also projects radially beyond the bores of the high-pressure line and the connecting piece.
  • the use of the known sealing element is limited to applications in which the components to be connected to one another are axially spaced apart from one another in the final state. This has the consequence that an arrangement consisting of the known sealing element and the two axially adjoining components has a relatively large axial length.
  • a component is also known in which the transition of two components is sealed by a sealing element and an extrusion coating.
  • the invention is based on the object of developing a fuel injector with a sealing element for a high-pressure connection in such a way that it has a particularly compact arrangement of the components with respect to one another in the axial direction in the installed state. In addition, a particularly good sealing effect should be achieved.
  • the invention is based on the idea of enabling at least two first sealing areas which are axially spaced apart from one another in relation to a longitudinal axis of the sealing element so that the at least two first sealing areas can be assigned to the bores of the two components which form the high-pressure connection, such that the sealing areas interact with an inner wall of the bore of the respective component.
  • the fuel injector comprises a sealing element described so far, the sealing element being arranged in the region of a recess formed by two components of the fuel injector, the recess being formed, for example, by two radially circumferential bores or inner walls of the components having the same radius, and wherein the Connect the two components axially to one another, forming a parting plane perpendicular to a longitudinal axis of the sealing element.
  • the fuel injector is characterized in that the two first sealing areas of the sealing element bear tightly against the inner walls of the two bores or components under high pressure.
  • the sealing element is elastically deformable and consists of metal, in particular a steel material.
  • the sealing element In a production-technically preferred embodiment of the sealing element, it has a wave shape in the axial cross section. As a result, the sealing element can be manufactured inexpensively and with high precision in a non-cutting forming process.
  • the sealing element in the unassembled state has a length with respect to its longitudinal axis that is greater than the height of the recess in the assembled state of the two components. This results in an axial shortening of the sealing element during the assembly or the axial bracing of the two components, such that the sealing element with its two opposite end faces seals in the region of the recess is present. A total of at least four sealing areas or sealing surfaces are thus formed between the two components and the sealing element. This results in a particularly safe or improved sealing effect.
  • a further preferred embodiment of the invention provides that, viewed in the direction of the sealing element in the axial direction of the longitudinal axis of the sealing element, sections which form the first sealing areas adjoin the two axial end areas of the sealing element.
  • Such a design of the sealing element has the effect that, when the two components are axially clamped even without hydraulic pressure, the sealing element is mechanically expanded radially by the assembly force, such that the first two sealing areas bear against the inner wall of the two components. This ensures reliable sealing of the high-pressure connection during operation, even with a relatively low hydraulic overpressure.
  • An additional seal is advantageously achieved according to the invention by arranging the two interconnected components in the area of the parting plane of the two components, at least in regions, in contact with one another. This not only limits the axial tensioning path of the two components during their assembly, but also achieves an additional sealing effect through the contact between the two components.
  • a fuel injector 10 is shown in regions as it is used to inject fuel into a combustion chamber (not shown) of a self-igniting internal combustion engine.
  • the fuel injector 10 is designed as a so-called common rail injector.
  • the fuel injector 10 has a nozzle body 11, to which a holding body 12 connects in the opposite direction to the injection openings of the nozzle body 11, not shown.
  • the nozzle body 11 is axially clamped to the holding body 12 by means of a nozzle clamping nut 15.
  • the nozzle body 11 and the holding body 12 are arranged in the assembled state in the region of opposite end faces 16, 17, at least in regions, in contact with one another.
  • the illustrated embodiment ensures that the end faces 16, 17 are machined accordingly so that when the nozzle body 11 is axially mounted on the holding body 12, the two end faces 16, 17 abut one another at least in a radially inner contact region 18.
  • a nozzle needle 20 acting as an injection member is arranged so as to be movable along a longitudinal axis 21.
  • the system pressure which can be, for example, more than 2000 bar, prevails in the recess 19, which is supplied at least indirectly with fuel prevailing under system pressure via a supply line (not shown).
  • the fuel injector 10 has a high-pressure connection 25, in which an in the Fig. 1 and 2nd recognizable sleeve-shaped sealing element 26 is arranged.
  • the sealing element 26 is preferably made of steel and has an undulating axial cross section.
  • the sealing element 26 in relation to its longitudinal axis 27, which in the exemplary embodiment shown coincides with the longitudinal axis 21 of the nozzle needle 20, the sealing element 26 has two axially spaced apart first sealing regions 31, 32 on its outer wall 28.
  • a depression 33 is formed between the two first sealing areas 31, 32, in the area of which the two end faces 16, 17 of the nozzle body 11 or of the holding body 12 or their parting plane also run.
  • the recess 19 is formed in each case by a bore section 34, 35 of the recess 19 in the nozzle body 11 or the holding body 12, which extends from the respective end face 16, 17.
  • the diameter D of the recess 19 is the same, at least in the area of the sealing element 26.
  • the sealing element 26 in the non-assembled state in the region of the two first sealing regions 31, 32 has an outer diameter d that is slightly smaller than the diameter D of the recess 19. This allows the sealing element 26 in Slightly insert in the axial direction into the bore sections 34, 35 of the recess 19. Furthermore, it is advantageous if, in the unassembled state of the sealing element 26, it has a length which is somewhat greater than the height H of the recess 19 when the nozzle body 11 and the holding body 12 are in the assembled state. This results in the axial clamping by means of the nozzle clamping nut 15 an axial sprain or an axial pressing of the sealing element 26 in the recess 19, such that according to the Fig.
  • the sealing element 26 is additionally radially expanded by the hydraulic pressure in the recess 19 such that the two first sealing regions 31, 32 against the corresponding sections of the bore 34 , 35 are pressed. This prevents fuel from escaping in the direction of the two end faces 16, 17 at least in the area of the two areas 31, 32.
  • an additional seal is created by the two second areas 41, 42, as well as by the contact area 18 between the nozzle body 11 and the holding body 12.
  • the sealing element 26a is arranged in the region of the high-pressure connection 25 between the holding body 12 and a valve piece 45.
  • a recess 19a in which the sealing element 26a is arranged, is formed between the holding body 12 and the valve piece 45 by a corresponding design of an outer wall section 46 of the valve piece 45 and a recess 47 in the holding body 12.
  • the sealing element 26a is arranged in the assembled state with a radially inner first sealing area 48 in contact with the outer wall section 46 of the valve piece 45 and forms a hydraulic seal there.
  • the radially inner first sealing area 48 is arranged in relation to the longitudinal axis 27 of the sealing element 26a between the two radially outer sealing areas 31, 32.
  • the holding body 12 is arranged in the region of an end face 49 in contact with an end face 50 of the valve piece 45.
  • the two axial end regions 36, 37 of the sealing element 26a form second sealing surfaces 41, 42 which bear against the valve piece 45 and the holding body 12 in a sealing manner.
  • the fuel injector 10, 10a described so far can be modified or modified in a variety of ways without deviating from the inventive concept.

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

Description

Stand der TechnikState of the art

Die Erfindung betrifft einen Kraftstoffinjektor unter Verwendung eines Dichtelements für eine Hochdruckverbindung.The invention relates to a fuel injector using a sealing element for a high-pressure connection.

Ein Dichtelement für einen Kraftstoffinjektor nach dem Oberbegriff des Anspruchs 1 ist aus der DE 102012 222 167 A1 der Anmelderin bekannt. Mittels des bekannten Dichtelements lässt sich eine Hochdruckleitung zu einem Anschlussstutzen in einem Kraftstoffinjektor abdichten. Dabei werden die Hochdruckleitung und der Anschlussstutzen mittels einer Überwurfmutter axial miteinander verspannt, wobei das Dichtelement innerhalb von Bohrungen der beiden axial zueinander beabstandeten Bauteile (Hochdruckleitung und Anschlussstutzen) angeordnet ist. Beim axialen Verspannen der Hochdruckleitung mit dem Anschlussstutzen verformt sich das Dichtelement radial nach außen und liegt mit einer Außenseite bzw. einem Außenumfang unter Ausbildung einer Abdichtung an den Mündungsbereichen der beiden Durchgangsbohrungen der beiden Bauteile an. Wesentlich dabei ist, dass das Dichtelement in einem in Bezug zu einer Längsachse des Dichtelements axial mittleren Bereich einen radial nach außen ragenden Dichtbereich aufweist, der im noch nicht axial belastetem Zustand des Dichtelements einen Außendurchmesser aufweist, der größer ist als der Durchmesser der Bohrungen an der Hochdruckleitung und dem Anschlussstutzen. Im axial verspannten Zustand des Dichtelements überragt es die Bohrungen der Hochdruckleitung und des Anschlussstutzens ebenfalls radial. Dadurch ist der Einsatz des bekannten Dichtelements auf Anwendungen beschränkt, bei denen die miteinander zu verbindenden Bauteile im Endzustand axial zueinander beabstandet angeordnet sind. Dies hat zur Folge, dass eine Anordnung, bestehend aus dem bekannten Dichtelement sowie den beiden axial aneinander anschließenden Bauteilen eine relativ große axiale Länge aufweist.A sealing element for a fuel injector according to the preamble of claim 1 is known from the DE 102012 222 167 A1 known to the applicant. A high-pressure line to a connection piece in a fuel injector can be sealed by means of the known sealing element. The high-pressure line and the connecting piece are axially clamped to one another by means of a union nut, the sealing element being arranged within bores of the two axially spaced apart components (high-pressure line and connecting piece). When the high-pressure line is braced axially with the connecting piece, the sealing element deforms radially outward and lies with an outer side or an outer circumference, forming a seal, at the mouth regions of the two through bores of the two components. It is essential that the sealing element has a radially outwardly projecting sealing area in a region that is axially central with respect to a longitudinal axis of the sealing element and that, when the sealing element is not yet axially loaded, has an outer diameter that is larger than the diameter of the bores on the High pressure line and the connecting piece. In the axially clamped state of the sealing element, it also projects radially beyond the bores of the high-pressure line and the connecting piece. As a result, the use of the known sealing element is limited to applications in which the components to be connected to one another are axially spaced apart from one another in the final state. This has the consequence that an arrangement consisting of the known sealing element and the two axially adjoining components has a relatively large axial length.

Weiterhin ist es aus der DE 102014 201 854 A1 der Anmelderin bekannt, zwischen zwei Bauteilen, die ebenfalls axial zueinander beabstandet sind, ein im Querschnitt eine Wellenform aufweisendes Dichtelement einzusetzen bzw. anzuordnen. Auch bei diesem Dichtelement ist somit mit Blick auf eine aus den Bauelementen und dem Dichtelement bestehende Anordnung ein erhöhter Raumbedarf erforderlich.Furthermore, it is from the DE 102014 201 854 A1 known to the applicant, between two components, which are also axially spaced from one another, to insert or arrange a sealing element having a wave shape in cross section. With this sealing element, too, an increased space requirement is required with a view to an arrangement consisting of the components and the sealing element.

Aus der DE 10 2012 204 310 A1 ist weiterhin ein Bauelement bekannt, bei dem der Übergang zweiter Bauteile durch ein Dichtelement und eine Umspritzung abgedichtet wird.From the DE 10 2012 204 310 A1 a component is also known in which the transition of two components is sealed by a sealing element and an extrusion coating.

Offenbarung der ErfindungDisclosure of the invention

Ausgehend von dem dargestellten Stand der Technik liegt der Erfindung die Aufgabe zugrunde, einen Kraftstoffinjektor mit einem Dichtelement für eine Hochdruckverbindung nach dem Oberbegriff des Anspruchs 1 derart weiterzubilden, dass dieser im Einbauzustand eine besonders kompakte Anordnung der Bauteile zueinander in axialer Richtung aufweist. Darüber hinaus soll eine besonders gute Dichtwirkung erzielt werden.On the basis of the prior art shown, the invention is based on the object of developing a fuel injector with a sealing element for a high-pressure connection in such a way that it has a particularly compact arrangement of the components with respect to one another in the axial direction in the installed state. In addition, a particularly good sealing effect should be achieved.

Diese Aufgabe wird erfindungsgemäß bei einem Kraftstoffinjektor mit den Merkmalen des Anspruchs 1 gelöst.This object is achieved in a fuel injector with the features of claim 1.

Der Erfindung liegt die Idee zugrunde, es durch die Ausbildung von wenigstens zwei in Bezug zu einer Längsachse des Dichtelements axial voneinander beabstandeten ersten Dichtbereichen zu ermöglichen, dass die wenigstens zwei ersten Dichtbereiche den Bohrungen der beiden die Hochdruckverbindung ausbildenden Bauteilen zugeordnet werden können, derart, dass die Dichtbereiche mit einer Innenwand der Bohrung des jeweiligen Bauteils zusammenwirken. Dadurch ist es möglich, dass die gegeneinander abzudichtenden Bauteile bei Verwendung des erfindungsgemäßen Dichtelements mit ihren einander zugewandten Stirnseiten unmittelbar in Anlagekontakt angeordnet werden können. Dies wiederum hat den Vorteil einer besonders kompakten Anordnung des Dichtelements innerhalb der Hochdruckverbindung.The invention is based on the idea of enabling at least two first sealing areas which are axially spaced apart from one another in relation to a longitudinal axis of the sealing element so that the at least two first sealing areas can be assigned to the bores of the two components which form the high-pressure connection, such that the sealing areas interact with an inner wall of the bore of the respective component. This makes it possible for the components to be sealed against one another to be arranged directly in contact with one another when using the sealing element according to the invention with their mutually facing end faces. This in turn has the advantage of a particularly compact arrangement of the sealing element within the high-pressure connection.

Erfindungsgemäß umfasst der Kraftstoffinjektor ein soweit beschriebenes Dichtelement, wobei das Dichtelement im Bereich einer durch zwei Bauteile des Kraftstoffinjektors ausgebildeten Ausnehmung angeordnet ist, wobei die Ausnehmung beispielsweise durch zwei radial umlaufende, einen gleichen Radius aufweisenden Bohrungen bzw. Innenwände der Bauteile gebildet ist, und wobei die beiden Bauteile unter Ausbildung einer senkrecht zu einer Längsachse des Dichtelements verlaufenden Trennebene axial aneinander anschließen. Erfindungsgemäß zeichnet sich der Kraftstoffinjektor dadurch aus, dass unter Hochdruckbeaufschlagung die beiden ersten Dichtbereiche des Dichtelements an den Innenwänden der beiden Bohrungen bzw. Bauteile dichtend anliegen.According to the invention, the fuel injector comprises a sealing element described so far, the sealing element being arranged in the region of a recess formed by two components of the fuel injector, the recess being formed, for example, by two radially circumferential bores or inner walls of the components having the same radius, and wherein the Connect the two components axially to one another, forming a parting plane perpendicular to a longitudinal axis of the sealing element. According to the invention, the fuel injector is characterized in that the two first sealing areas of the sealing element bear tightly against the inner walls of the two bores or components under high pressure.

Vorteilhafte Weiterbildungen des erfindungsgemäßen Dichtelements sind in den Unteransprüchen aufgeführt.Advantageous developments of the sealing element according to the invention are listed in the subclaims.

Um einerseits bei den zur Diskussion stehenden relativ hohen Drücken in dem Kraftstoffinjektor (gemeint sind hierbei Systemdrücke, die mehr als 2000 bar betragen können) eine genügend hohe mechanische Druckfestigkeit bereitzustellen sowie andererseits die Möglichkeit zu schaffen, eine derartige Hochdruckverbindung auch mit relativ geringem Aufwand wieder zu trennen und anschließend wieder auszubilden, ist es vorgesehen, dass das Dichtelement elastisch verformbar ist und aus Metall, insbesondere aus einem Stahlwerkstoff besteht.In order to provide a sufficiently high mechanical pressure resistance at the relatively high pressures under discussion in the fuel injector (meaning system pressures which can be more than 2000 bar) and on the other hand to create the possibility of re-closing such a high pressure connection with relatively little effort separate and then form again, it is provided that the sealing element is elastically deformable and consists of metal, in particular a steel material.

In herstellungstechnisch bevorzugter Ausgestaltung des Dichtelements weist dieses im axialen Querschnitt eine Wellenform auf. Dadurch lässt sich das Dichtelement in einem spanlosen Umformvorgang preiswert und hochgenau herstellen.In a production-technically preferred embodiment of the sealing element, it has a wave shape in the axial cross section. As a result, the sealing element can be manufactured inexpensively and with high precision in a non-cutting forming process.

Um nicht nur am Außenumfang bzw. in radialer Richtung des Dichtelements eine Abdichtung zu den beiden Bauteilen zu ermöglichen, sondern auch in axialer Richtung, ist es vorgesehen, dass das Dichtelement in nicht montiertem Zustand in Bezug zu seiner Längsachse eine Länge aufweist, die größer ist als die Höhe der Ausnehmung im montierten Zustand der beiden Bauteile. Dadurch wird bei der Montage bzw. der axialen Verspannung der beiden Bauteile eine axiale Verkürzung des Dichtelements bewirkt, derart, dass das Dichtelement mit seinen beiden gegenüberliegenden Stirnflächen dichtend im Bereich der Ausnehmung anliegt. Somit werden insgesamt wenigstens vier Dichtbereiche bzw. Dichtflächen zwischen den beiden Bauteilen sowie dem Dichtelement gebildet. Dies bewirkt eine besonders sichere bzw. verbesserte Abdichtwirkung.In order to enable a seal to the two components not only on the outer circumference or in the radial direction of the sealing element, but also in the axial direction, it is provided that the sealing element in the unassembled state has a length with respect to its longitudinal axis that is greater than the height of the recess in the assembled state of the two components. This results in an axial shortening of the sealing element during the assembly or the axial bracing of the two components, such that the sealing element with its two opposite end faces seals in the region of the recess is present. A total of at least four sealing areas or sealing surfaces are thus formed between the two components and the sealing element. This results in a particularly safe or improved sealing effect.

Eine weitere bevorzugte Ausgestaltung der Erfindung sieht vor, dass sich an die beiden axialen Endbereiche des Dichtelements in Richtung zum Dichtelement betrachtet in axialer Richtung der Längsachse des Dichtelements radial schräg nach außen ragende Abschnitte anschließen, die die ersten Dichtbereiche ausbilden. Eine derartige Ausbildung des Dichtelements bewirkt, dass beim axialen Verspannen der beiden Bauteile selbst ohne hydraulischem Druck das Dichtelement mechanisch durch die Montagekraft radial aufgeweitet wird, derart, dass die beiden ersten Dichtbereiche an der Innenwand der beiden Bauteile anliegen. Dadurch ist im Betrieb selbst bei einem relativ geringen hydraulischen Überdruck eine zuverlässige Abdichtung der Hochdruckverbindung sichergestellt.A further preferred embodiment of the invention provides that, viewed in the direction of the sealing element in the axial direction of the longitudinal axis of the sealing element, sections which form the first sealing areas adjoin the two axial end areas of the sealing element. Such a design of the sealing element has the effect that, when the two components are axially clamped even without hydraulic pressure, the sealing element is mechanically expanded radially by the assembly force, such that the first two sealing areas bear against the inner wall of the two components. This ensures reliable sealing of the high-pressure connection during operation, even with a relatively low hydraulic overpressure.

Eine zusätzliche Abdichtung wird erfindungsgemäß in vorteilhafter Art und Weise dadurch erzielt, dass die beiden miteinander verbundenen Bauteile im Bereich der Trennebene der beiden Bauteile zumindest bereichsweise in Anlagekontakt zueinander angeordnet sind. Dadurch wird nicht nur der axiale Verspannweg der beiden Bauteile bei deren Montage begrenzt, sondern durch den Anlagekontakt zwischen den beiden Bauteilen eine zusätzliche Abdichtwirkung erzielt.An additional seal is advantageously achieved according to the invention by arranging the two interconnected components in the area of the parting plane of the two components, at least in regions, in contact with one another. This not only limits the axial tensioning path of the two components during their assembly, but also achieves an additional sealing effect through the contact between the two components.

Obwohl grundsätzlich innerhalb eines Kraftstoffinjektors mehrere Stellen denkbar sind, an denen das soweit beschriebene Dichtelement in bevorzugter Art und Weise angeordnet werden kann, sind diejenigen Bereiche besonders relevant, in denen der hydraulische Druck dem Systemdruck entspricht, d.h. besonders hoch ist. Gedacht ist hierbei insbesondere an Anwendungsfälle, bei denen das Dichtelement zwischen einem Haltekörper und einem Düsenkörper angeordnet ist, oder an Anwendungsfälle, bei denen das Dichtelement zwischen einem Ventilstück und einem Haltekörper angeordnet ist.Although in principle several places are conceivable within a fuel injector at which the sealing element described so far can be arranged in a preferred manner, those areas are particularly relevant in which the hydraulic pressure corresponds to the system pressure, i.e. is particularly high. In this context, particular consideration is given to applications in which the sealing element is arranged between a holding body and a nozzle body, or to applications in which the sealing element is arranged between a valve piece and a holding body.

Weitere Vorteile, Merkmale und Einzelheiten der Erfindung ergeben sich aus der nachfolgenden Beschreibung bevorzugter Ausführungsbeispiele sowie anhand der Zeichnung.Further advantages, features and details of the invention result from the following description of preferred exemplary embodiments and from the drawing.

Diese zeigt in:

Fig. 1
einen Teilbereich eines Kraftstoffinjektors im Verbindungsbereich zwischen einem Düsenkörper und einem Haltekörper im Längsschnitt,
Fig. 2
ein Detail der Fig. 1 in vergrößerter Darstellung,
Fig. 3
einen Teilbereich eines Kraftstoffinjektors im Verbindungsbereich zwischen einem Ventilstück und einem Haltekörper im Längsschnitt und
Fig. 4
ein Detail der Fig. 3 in vergrößerter Darstellung.
This shows in:
Fig. 1
a partial area of a fuel injector in the connection area between a nozzle body and a holding body in longitudinal section,
Fig. 2
a detail of the Fig. 1 in an enlarged view,
Fig. 3
a partial area of a fuel injector in the connection area between a valve piece and a holding body in longitudinal section and
Fig. 4
a detail of the Fig. 3 in an enlarged view.

Gleiche Elemente bzw. Elemente mit gleicher Funktion sind in den Figuren mit den gleichen Bezugsziffern versehen.The same elements or elements with the same function are provided with the same reference numbers in the figures.

In der Fig. 1 ist bereichsweise ein Kraftstoffinjektor 10 dargestellt, wie er zum Einspritzen von Kraftstoff in einen nicht gezeigten Brennraum einer selbstzündenden Brennkraftmaschine dient. Insbesondere ist der Kraftstoffinjektor 10 als sogenannter Common-Rail-Injektor ausgebildet.In the Fig. 1 a fuel injector 10 is shown in regions as it is used to inject fuel into a combustion chamber (not shown) of a self-igniting internal combustion engine. In particular, the fuel injector 10 is designed as a so-called common rail injector.

Der Kraftstoffinjektor 10 weist einen Düsenkörper 11 auf, an den sich auf der nicht gezeigten Einspritzöffnungen des Düsenkörpers 11 entgegengesetzten Richtung ein Haltekörper 12 anschließt. Der Düsenkörper 11 ist mit dem Haltekörper 12 mittels einer Düsenspannmutter 15 axial verspannt. Insbesondere sind der Düsenkörper 11 und der Haltekörper 12 im montierten Zustand im Bereich gegenüberliegender Stirnflächen 16, 17 zumindest bereichsweise in Anlagekontakt zueinander angeordnet. Bei dem in den Fig. 1 und 2 dargestellten Ausführungsbeispiel ist durch eine entsprechende Bearbeitung der Stirnflächen 16, 17 sichergestellt, dass im axial montierten Zustand des Düsenkörpers 11 an dem Haltekörper 12 die beiden Stirnflächen 16, 17 zumindest in einem radial inneren Anlagebereich 18 aneinander anliegen.The fuel injector 10 has a nozzle body 11, to which a holding body 12 connects in the opposite direction to the injection openings of the nozzle body 11, not shown. The nozzle body 11 is axially clamped to the holding body 12 by means of a nozzle clamping nut 15. In particular, the nozzle body 11 and the holding body 12 are arranged in the assembled state in the region of opposite end faces 16, 17, at least in regions, in contact with one another. In the in the Fig. 1 and 2nd The illustrated embodiment ensures that the end faces 16, 17 are machined accordingly so that when the nozzle body 11 is axially mounted on the holding body 12, the two end faces 16, 17 abut one another at least in a radially inner contact region 18.

Innerhalb einer Ausnehmung 19 des Kraftstoffinjektors 10 ist eine als Einspritzglied wirkende Düsennadel 20 entlang einer Längsachse 21 hubbeweglich angeordnet. Mittels der Düsennadel 20 lassen sich die angesprochenen Einspritzöffnungen zum Einspritzen von Kraftstoff in den Brennraum der Brennkraftmaschine freigeben bzw. verschließen. Hierzu herrscht in der Ausnehmung 19, welche über eine nicht dargestellte Versorgungsleitung zumindest mittelbar mit unter Systemdruck herrschendem Kraftstoff versorgt ist, der Systemdruck, der beispielsweise mehr als 2000 bar betragen kann.Within a recess 19 of the fuel injector 10, a nozzle needle 20 acting as an injection member is arranged so as to be movable along a longitudinal axis 21. By means of the nozzle needle 20, the mentioned injection openings for injecting fuel into the Release or close the combustion chamber of the internal combustion engine. For this purpose, the system pressure, which can be, for example, more than 2000 bar, prevails in the recess 19, which is supplied at least indirectly with fuel prevailing under system pressure via a supply line (not shown).

Um eine Leckage zwischen dem Düsenkörper 11 und dem Haltekörper 12 im Bereich der beiden Stirnflächen 16, 17 zu vermeiden, weist der Kraftstoffinjektor 10 eine Hochdruckverbindung 25 auf, in der ein in den Fig. 1 und 2 erkennbares hülsenförmiges Dichtelement 26 angeordnet ist. Das Dichtelement 26 besteht vorzugsweise aus Stahl und ist im axialen Querschnitt wellenförmig ausgebildet. Insbesondere weist das Dichtelement 26 in Bezug zu seiner Längsachse 27, die im dargestellten Ausführungsbeispiel mit der Längsachse 21 der Düsenadel 20 zusammenfällt, an seiner Außenwand 28 zwei axial zueinander beabstandete erste Dichtbereiche 31, 32 auf. Zwischen den beiden ersten Dichtbereichen 31, 32 ist eine Vertiefung 33 ausgebildet, in deren Bereich auch die beiden Stirnflächen 16, 17 des Düsenkörpers 11 bzw. des Haltekörpers 12 bzw. deren Trennebene verlaufen.In order to avoid leakage between the nozzle body 11 and the holding body 12 in the region of the two end faces 16, 17, the fuel injector 10 has a high-pressure connection 25, in which an in the Fig. 1 and 2nd recognizable sleeve-shaped sealing element 26 is arranged. The sealing element 26 is preferably made of steel and has an undulating axial cross section. In particular, in relation to its longitudinal axis 27, which in the exemplary embodiment shown coincides with the longitudinal axis 21 of the nozzle needle 20, the sealing element 26 has two axially spaced apart first sealing regions 31, 32 on its outer wall 28. A depression 33 is formed between the two first sealing areas 31, 32, in the area of which the two end faces 16, 17 of the nozzle body 11 or of the holding body 12 or their parting plane also run.

Die Ausnehmung 19 wird durch jeweils einen Bohrungsabschnitt 34, 35 der Ausnehmung 19 in dem Düsenkörper 11 bzw. dem Haltekörper 12 gebildet, die von der jeweiligen Stirnfläche 16, 17 ausgeht. Der Durchmesser D der Ausnehmung 19 ist zumindest im Bereich des Dichtelements 26 gleich groß.The recess 19 is formed in each case by a bore section 34, 35 of the recess 19 in the nozzle body 11 or the holding body 12, which extends from the respective end face 16, 17. The diameter D of the recess 19 is the same, at least in the area of the sealing element 26.

Weiterhin ist es zur Vereinfachung der Montage vorgesehen, dass das Dichtelement 26 im nicht montierten Zustand im Bereich der beiden ersten Dichtbereiche 31, 32 einen Außendurchmesser d aufweist, der etwas geringer ist als der Durchmesser D der Ausnehmung 19. Dadurch lässt sich das Dichtelement 26 in axialer Richtung leicht in die Bohrungsabschnitte 34, 35 der Ausnehmung 19 einführen. Weiterhin ist es von Vorteil, wenn in den nicht montierten Zustand des Dichtelements 26 dieses eine Länge aufweist, die etwas größer ist als die Höhe H der Ausnehmung 19 bei montiertem Zustand von Düsenkörper 11 und Haltekörper 12. Dadurch findet bei der axialen Verspannung mittels der Düsenspannmutter 15 eine axiale Verstauchung bzw. ein axiales Verpressen des Dichtelements 26 in der Ausnehmung 19 statt, derart, dass entsprechend der Fig. 2 die beiden axialen Endbereiche 36, 37 des Dichtelements 26 dichtend am Grund 38, 39 des jeweiligen Bohrungsabschnitts 34, 35 anliegen und dadurch zweite Dichtbereiche 41, 42 ausbilden. Ferner ist anhand der Fig. 2 erkennbar, dass aufgrund der Wellenform des Dichtelements 26 von den beiden axialen Endbereichen 36, 37 in Richtung zu den Stirnflächen 16, 17 Abschnitte 43, 44 des Dichtelements 26 ausgehen, die in Bezug zur Längsachse 27 des Dichtelements 26 radial nach außen ragen bzw. schräg angeordnet sind. Die Abschnitte 43, 44 enden im Bereich der ersten Dichtbereiche 31, 32. Beim axialen Verspannen von Düsenkörper 11 und Haltekörper 12 werden durch die geometrische Ausbildung der Abschnitte 43, 44 die ersten Dichtbereiche 31, 32 radial nach außen gegen die Ausnehmung 19 gepresst.Furthermore, to simplify the assembly, it is provided that the sealing element 26 in the non-assembled state in the region of the two first sealing regions 31, 32 has an outer diameter d that is slightly smaller than the diameter D of the recess 19. This allows the sealing element 26 in Slightly insert in the axial direction into the bore sections 34, 35 of the recess 19. Furthermore, it is advantageous if, in the unassembled state of the sealing element 26, it has a length which is somewhat greater than the height H of the recess 19 when the nozzle body 11 and the holding body 12 are in the assembled state. This results in the axial clamping by means of the nozzle clamping nut 15 an axial sprain or an axial pressing of the sealing element 26 in the recess 19, such that according to the Fig. 2 the two axial end regions 36, 37 of the sealing element 26 sealing against the base 38, 39 of the respective bore section 34, 35 abut and thereby form second sealing areas 41, 42. Furthermore, based on the Fig. 2 It can be seen that, due to the wave shape of the sealing element 26, sections 43, 44 of the sealing element 26 extend from the two axial end regions 36, 37 in the direction of the end faces 16, 17, which project radially outwards or obliquely with respect to the longitudinal axis 27 of the sealing element 26 are arranged. The sections 43, 44 end in the area of the first sealing areas 31, 32. When the nozzle body 11 and the holding body 12 are axially clamped, the geometrical design of the sections 43, 44 presses the first sealing areas 31, 32 radially outward against the recess 19.

Während des Betriebs des Kraftstoffinjektors 10, bei dem innerhalb der Ausnehmung 19 der Systemdruck herrscht, wird das Dichtelement 26 zusätzlich durch den hydraulischen Druck in der Ausnehmung 19 radial aufgeweitet, derart, dass die beiden ersten Dichtbereiche 31, 32 gegen die entsprechenden Abschnitte der Bohrung 34, 35 gepresst werden. Dadurch wird zumindest im Bereich der beiden Bereiche 31, 32 ein Austreten von Kraftstoff in Richtung der beiden Stirnflächen 16, 17 vermieden. Darüber hinaus wird durch die beiden zweiten Bereiche 41, 42 eine zusätzliche Abdichtung geschaffen, ebenso wie durch den Anlagebereich 18 zwischen dem Düsenkörper 11 und dem Haltekörper 12.During operation of the fuel injector 10, in which the system pressure prevails within the recess 19, the sealing element 26 is additionally radially expanded by the hydraulic pressure in the recess 19 such that the two first sealing regions 31, 32 against the corresponding sections of the bore 34 , 35 are pressed. This prevents fuel from escaping in the direction of the two end faces 16, 17 at least in the area of the two areas 31, 32. In addition, an additional seal is created by the two second areas 41, 42, as well as by the contact area 18 between the nozzle body 11 and the holding body 12.

Bei dem Kraftstoffinjektor 10a der Fig. 3 und 4 ist das Dichtelement 26a im Bereich der Hochdruckverbindung 25 zwischen dem Haltekörper 12 und einem Ventilstück 45 angeordnet. Zwischen dem Haltekörper 12 und dem Ventilstück 45 ist durch eine entsprechende Gestaltung eines Außenwandabschnitts 46 des Ventilstücks 45 und einer Ausnehmung 47 im Haltekörper 12 eine Ausnehmung 19a ausgebildet, in der das Dichtelement 26a angeordnet ist. Wie insbesondere anhand der Fig. 4 erkennbar ist, ist im montierten Zustand das Dichtelement 26a mit einem radial inneren ersten Dichtbereich 48 in Anlagekontakt mit dem Außenwandabschnitt 46 des Ventilstücks 45 angeordnet und bildet dort eine hydraulische Abdichtung aus. Der radial innere erste Dichtbereich 48 ist in Bezug zur Längsachse 27 des Dichtelements 26a zwischen den beiden radial äußeren Dichtbereichen 31, 32 angeordnet. Darüber hinaus ist der Haltekörper 12 im Bereich einer Stirnfläche 49 in Anlagekontakt mit einer Stirnfläche 50 des Ventilstücks 45 angeordnet.In the fuel injector 10a Fig. 3 and 4th the sealing element 26a is arranged in the region of the high-pressure connection 25 between the holding body 12 and a valve piece 45. A recess 19a, in which the sealing element 26a is arranged, is formed between the holding body 12 and the valve piece 45 by a corresponding design of an outer wall section 46 of the valve piece 45 and a recess 47 in the holding body 12. As especially with the help of Fig. 4 can be seen, the sealing element 26a is arranged in the assembled state with a radially inner first sealing area 48 in contact with the outer wall section 46 of the valve piece 45 and forms a hydraulic seal there. The radially inner first sealing area 48 is arranged in relation to the longitudinal axis 27 of the sealing element 26a between the two radially outer sealing areas 31, 32. In addition, the holding body 12 is arranged in the region of an end face 49 in contact with an end face 50 of the valve piece 45.

Auch bei dem in den Fig. 3 und 4 dargestellten Ausführungsbeispiel bilden die beiden axialen Endbereiche 36, 37 des Dichtelements 26a zweite Dichtflächen 41, 42 aus, die an dem Ventilstück 45 bzw. dem Haltekörper 12 dichtend anliegen.Even in the Fig. 3 and 4th In the exemplary embodiment shown, the two axial end regions 36, 37 of the sealing element 26a form second sealing surfaces 41, 42 which bear against the valve piece 45 and the holding body 12 in a sealing manner.

Der soweit beschriebene Kraftstoffinjektor 10, 10a kann in vielfältiger Art und Weise abgewandelt bzw. modifiziert werden, ohne vom Erfindungsgedanken abzuweichen. Darüber hinaus ist es auch denkbar, das Dichtelement 26, 26a in Bezug auf seine Längsachse 27 nicht nur mit zwei ersten Dichtbereichen 31, 32 beim Dichtelement 26 bzw. mit drei ersten Dichtbereichen 31, 32, 48 beim Kraftstoffinjektor 10a auszustatten, sondern es können auch zusätzliche Dichtbereiche vorgesehen sein, die an der Außenwand bzw. der Innenwand des Dichtelements 26, 26a vorgesehen sind.The fuel injector 10, 10a described so far can be modified or modified in a variety of ways without deviating from the inventive concept. In addition, it is also conceivable not only to provide the sealing element 26, 26a with respect to its longitudinal axis 27 with two first sealing areas 31, 32 for the sealing element 26 or with three first sealing areas 31, 32, 48 for the fuel injector 10a, but also additional sealing areas can be provided, which are provided on the outer wall or the inner wall of the sealing element 26, 26a.

Claims (10)

  1. Fuel injector (10; 10a) having a sealing element (26; 26a) for a high-pressure connection (25) in the fuel injector (10; 10a), wherein the sealing element (26; 26a) is of sleeve-shaped form and, at its outer circumference, has two radially outwardly projecting first sealing regions (31, 32) which are designed for abutting against a component (11, 12) and which are spaced apart from one another axially in relation to the longitudinal axis (27) of the sealing element (26; 26a), wherein the sealing element (26; 26a) is arranged in the region of a recess (19; 19a) which is formed by two components (11, 12, 45) of the fuel injector (10; 10a), and wherein the two components (11, 12, 45) axially adjoin one another perpendicularly with respect to a longitudinal axis (27) of the sealing element (26; 26a),
    characterized
    in that the sealing element (31, 32) radially expands under the high-pressure pressurization of the recess (19; 19a), such that the two first sealing regions (31, 32) of the sealing element (26; 26a) bear sealingly against the recess (19; 19a).
  2. Fuel injector according to Claim 1,
    characterized
    in that at least one third, radially inwardly projecting first sealing region (48) is provided.
  3. Fuel injector according to Claim 1 or 2,
    characterized
    in that the sealing element (26; 26a) is elastically deformable and is composed of a metal, in particular of a steel material.
  4. Fuel injector according to any of Claims 1 to 3,
    characterized
    in that the sealing element (26; 26a) has an undulating shape in axial cross section.
  5. Fuel injector according to any of Claims 1 to 4,
    characterized
    in that the sealing element (26; 26a) forms second sealing regions (41, 42) at its oppositely situated face sides.
  6. Fuel injector according to Claim 5,
    characterized
    in that the two second sealing regions (41, 42) are adjoined, in the direction of the longitudinal axis (27) of the sealing element (26; 26a) on the side situated opposite the second sealing regions (41, 42), by obliquely outwardly projecting portions (43, 44) which transition into the first sealing regions (31, 32).
  7. Fuel injector according to Claim 1,
    characterized
    in that the sealing element (26; 26a), in the non-installed state, has a length in relation to its longitudinal axis (27) which is greater than the height (H) of the recess (19; 19a) in the installed state of the two components (11, 12, 45).
  8. Fuel injector according to Claim 1 or 7,
    characterized
    in that the two components (11, 12, 45) are in abutting contact with one another at least in certain regions.
  9. Fuel injector according to any of Claims 1, 7 and 8,
    characterized
    in that the sealing element (26) is arranged between a holding body (12) and a nozzle body (11).
  10. Fuel injector according to any of Claims 1, 7 and 8,
    characterized
    in that the sealing element (26a) is arranged between a valve piece (45) and a holding body (12).
EP16777656.6A 2015-11-26 2016-09-29 Fuel injector comprising a sealing element Active EP3380716B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102015223440.1A DE102015223440A1 (en) 2015-11-26 2015-11-26 Sealing element and fuel injector with a sealing element
PCT/EP2016/073323 WO2017089013A1 (en) 2015-11-26 2016-09-29 Sealing element, and fuel injector comprising a sealing element

Publications (2)

Publication Number Publication Date
EP3380716A1 EP3380716A1 (en) 2018-10-03
EP3380716B1 true EP3380716B1 (en) 2020-05-06

Family

ID=57083293

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16777656.6A Active EP3380716B1 (en) 2015-11-26 2016-09-29 Fuel injector comprising a sealing element

Country Status (5)

Country Link
EP (1) EP3380716B1 (en)
KR (1) KR20180085765A (en)
CN (1) CN108495994B (en)
DE (1) DE102015223440A1 (en)
WO (1) WO2017089013A1 (en)

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3919231C2 (en) * 1989-06-13 1997-03-06 Bosch Gmbh Robert Fuel injection device for internal combustion engines
DE10149514A1 (en) * 2001-10-08 2003-04-24 Bosch Gmbh Robert Fuel injector for IC engine fuel injection system, has deformable compensation sleeve for compensation of skew between coupled components
DE102006048727A1 (en) * 2006-10-16 2008-04-17 Robert Bosch Gmbh Fuel injector with solenoid valve
DE102011087954A1 (en) * 2011-12-08 2013-06-13 Robert Bosch Gmbh Injection valve, in particular for an internal combustion engine
DE102012204310A1 (en) * 2012-03-19 2013-09-19 Robert Bosch Gmbh A sealed over-molded component and method for producing such a component
EP2700806A1 (en) * 2012-08-23 2014-02-26 Continental Automotive GmbH Fuel injector, fuel injection assembly and use of a sealing ring
DE102012222167A1 (en) 2012-12-04 2014-06-05 Robert Bosch Gmbh High-pressure terminal for fuel injection system for internal combustion engine, has sealing element with spring seal lens which is deformable by pressure of fuel in high pressure channel that is sealed in terminal portion
CN203670023U (en) * 2013-11-01 2014-06-25 上海汽车集团股份有限公司 Oil injector, diesel engine and sealing part for oil injector
DE102014201854A1 (en) 2014-02-03 2015-08-06 Robert Bosch Gmbh Sealing disk for a fuel injector, as well as fuel injector with such a sealing washer

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
DE102015223440A1 (en) 2017-06-01
WO2017089013A1 (en) 2017-06-01
EP3380716A1 (en) 2018-10-03
CN108495994A (en) 2018-09-04
KR20180085765A (en) 2018-07-27
CN108495994B (en) 2021-06-08

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