EP2912301A1 - Fuel injector - Google Patents

Fuel injector

Info

Publication number
EP2912301A1
EP2912301A1 EP13766372.0A EP13766372A EP2912301A1 EP 2912301 A1 EP2912301 A1 EP 2912301A1 EP 13766372 A EP13766372 A EP 13766372A EP 2912301 A1 EP2912301 A1 EP 2912301A1
Authority
EP
European Patent Office
Prior art keywords
valve housing
sleeve
sealing element
combustion chamber
fuel injector
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
EP13766372.0A
Other languages
German (de)
French (fr)
Other versions
EP2912301B1 (en
Inventor
Frank Stadler
Bernd Siewert
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP2912301A1 publication Critical patent/EP2912301A1/en
Application granted granted Critical
Publication of EP2912301B1 publication Critical patent/EP2912301B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/14—Arrangements of injectors with respect to engines; Mounting 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
    • 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
    • F02M61/166—Selection of particular materials
    • 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
    • F02M2200/85—Mounting of fuel injection apparatus
    • F02M2200/858—Mounting of fuel injection apparatus sealing arrangements between injector and engine

Definitions

  • the invention relates to a fuel! Njektor according to the preamble of
  • the injector is used to inject fuel into the combustion chamber of an internal combustion engine.
  • the internal combustion engine in the region of a combustion chamber bounding
  • Fuel! Njektor is inserted with its valve housing.
  • the fuel injector protrudes into the combustion chamber of the internal combustion engine with at least one nozzle opening.
  • the injector of the fuel injector is usually with the interposition of a nozzle disc and with axial
  • Preload received in the receiving bore of the cylinder head Preload received in the receiving bore of the cylinder head.
  • the highest temperature prevails in the combustion chamber, which gradually decreases in the cylinder head or in the receiving bore on the side facing away from the combustion chamber, as a function of the distance to the combustion chamber.
  • the temperature of the fuel injector or its valve housing also increases with increasing distance
  • Combustion chamber off In particular, at relatively low combustion chamber temperatures or at a relatively large distance from the combustion chamber, it may favor, among other things, for example, by sulfur-containing fuel or resulting from the combustion of the fuel water to form condensate on the valve body of the fuel! come in njektors. Since the valve housing in the cylinder head is sealed to the outside via the nozzle sealing disk, the area axially below the nozzle sealing disk in the region of a first receiving bore section of the cylinder head is particularly affected, because there, in relative terms, the lowest temperatures prevail. The formation of condensation can lead to corrosion of the valve housing in the area mentioned come over the life of the fuel! Seen njektors considered can lead to an impairment of the functioning of the fuel injector.
  • Valve housing have a greater wall thickness, which is in practice for various reasons neither desired nor possible, since for example the diameter of the receiving bore for the fuel injector in the region of the valve housing is predetermined.
  • the present invention seeks to further develop a fuel injector, in particular a common rail injector for use in self-igniting internal combustion engines according to the preamble of claim 1 such that using a sealing element, as in spark-ignited internal combustion engines is known, a constructive at least substantially unchanged, ie Conventional valve body can be used.
  • a fuel injector with the features of claim 1, characterized in that the sealing element by means of a separate component formed as an additional element in the axial direction of the first
  • Valve housing portion (12) is positioned. In contrast to the prior art, it is therefore not necessary, the valve housing by means of an annular groove o. to be provided with a concomitant weakening of the valve housing or an increased wall thickness.
  • the additional element be designed in the form of a sleeve which encloses the first
  • Valve housing portion radially, preferably with a small gap surrounds.
  • Such a design also has the particular advantage that the sleeve can act in the manner of a protective element in which in the presence of condensate initially the sleeve as a kind of "sacrificial element" is used before the
  • Condensate can attack the actual valve body, if it should come to a failure of the sealing element.
  • the end face is in the installation position the second valve housing portion rests, and when the edge portion rests on a stage of the receiving opening, of which the first
  • Receiving bore portion goes out.
  • Receiving bore portion may optionally be dispensed with the nozzle visor conventionally used in the prior art, and by the formation of the
  • flange-shaped peripheral edge is a particularly safe investment or support of the fuel! Njektors in the receiving bore of the cylinder head and the possibility of a particularly simple assembly and disassembly of the sleeve in the receiving opening allows.
  • the sleeve In the event that the sleeve is exposed to the condensate, it is appropriate that this is as resistant to the condensate as possible, i. is not mechanically or chemically damaged by the action of the condensate. Therefore, it is provided in a further embodiment of the invention that the sleeve consists of an inert material, in particular stainless steel or plastic.
  • the sealing element consists of plastic, in particular based on Viton, silicone or Teflon.
  • the sealing element is arranged on the combustion chamber facing the end face of the sleeve. This ensures that the sealing element is that element which first comes into operative connection with the condensate when condensate occurs.
  • connection between the plastic of the sealing element and the sleeve is inventively preferably prepared by the fact that the plastic of the sealing element by injection molding on the end face of the sleeve or through
  • Dipping the sleeve is connected in the liquefied plastic of the sealing element with the sleeve.
  • the sealing element it is particularly advantageous according to the invention, when the sealing element, the sleeve radially to the first
  • Valve housing section seals off. This ensures in particular that when condensate occurs, the condensate does not come into operative connection with the valve housing section, as is sealed by the sealing element of the radial gap between the valve housing and the receiving opening of the sleeve.
  • the sealing element bears radially on the first receiving bore portion sealingly and thereby the radial area between the sleeve and the first
  • Receiving bore section seals. This ensures that no condensate in the radial circumferential gap between the
  • Receiving bore portion and the sleeve can pass, so that the sleeve itself is optimally protected against the action of condensate.
  • Fig. 1 is an illustration of a lower part of an inventive
  • FIG. 2 shows one for use with the fuel injector according to FIG. 1.
  • FIG. 1 shows a detail of the upper region of a self-igniting internal combustion engine with its cylinder head 100.
  • the cylinder head 100 defines a combustion chamber 101 of the internal combustion engine, in which a piston 102 is arranged in the usual way up and down movable in the direction of a longitudinal axis 105.
  • the cylinder head 100 has a receiving opening 106 in the form of a stepped bore.
  • the receiving opening 106 is designed in particular as a common rail injector.
  • 106 includes on the combustion chamber 101 side facing a first receiving bore portion 107, to which a second receiving bore portion 108 connects to the side facing away from the combustion chamber 101 side.
  • the two receiving bore portions 107, 108 are connected to each other via a radially encircling step 109, wherein the first receiving bore portion
  • Receiving bore portions 107, 108 are preferably each cylindrical.
  • the injector 10 comprises a valve housing 11 made of metal with two valve housing sections 12, 13 connected in one piece with one another.
  • the first valve housing section 12 has a smaller diameter than the second
  • Valve housing portion 13 wherein the two valve housing sections 12, 13 are preferably cylindrical.
  • the first valve housing portion 12 is disposed substantially within the first receiving bore portion 107, and the second valve housing portion 13 within the second receiving bore portion 108.
  • the first valve housing portion 12 merges on the side facing the combustion chamber 101 in a dome-like end portion 14, in whose wall at least one nozzle opening 15 is formed, can be injected via the fuel into the combustion chamber 101 of the internal combustion engine.
  • the injection of the fuel takes place in a known per se and therefore not explained in more detail, because not essential to the invention in particular by a nozzle needle arranged in the fuel injector 10, which can be actuated by an actuator.
  • Receiving bore portion 107 is arranged, the end portion 14 of the valve housing 1 1 protrudes into the combustion chamber 101.
  • the arrangement of the Fuel! Njektors 10 to the combustion chamber 101 and the longitudinal axis 105 is exemplified parallel to the longitudinal axis 105, but it may also be provided obliquely to the longitudinal axis 105.
  • Receiving bore portion 108 decreases toward.
  • the first valve housing portion 12 within the first receiving bore portion 107 is radially surrounded by a sealing element 20.
  • the sealing element 20 protrudes in relation to the longitudinal axis 105 almost to the end of the first receiving bore section 107 facing the lower end face 11 of the cylinder head 100. However, the sealing element 20 does not project into the combustion chamber 101 in any way.
  • the preferably made of (heat-resistant) plastic, preferably based on Viton, silicone or Teflon sealing element 20 is arranged or attached to an additional element 21.
  • the additional element 21 is designed in the form of a sleeve 22 and consists of an inert material, in particular stainless steel or plastic.
  • the sealing element 20 is arranged or attached to the combustion chamber 101 facing end face 23 of the sleeve 22.
  • the attachment of the sealing element 20 is effected either by the fact that the sealing element 20 is molded onto the end face 23 of the additional element 21, for example by means of surface elements arranged in the immediate region of the end face 23, or by the additional element 21 with its end face 23 in the initially liquefied material of the sealing element 20 is immersed and adheres to the solidification of the end face 23.
  • the sealing element 20 is formed preferably convex both on its outer circumference 24 and on its inner circumference 25, such that the outer circumference 24 of the sealing element 20 bears sealingly against the first receiving bore section 107, while the inner circumference 25 of the sealing element 20 is in sealing abutting contact with the first valve housing section 12.
  • the additional element 21 is used in particular for the axial positioning of the sealing element 20 on the outside of the first valve housing section 12.
  • the additional element 21 on the sealing element 20 is used in particular for the axial positioning of the sealing element 20 on the outside of the first valve housing section 12.
  • Valve housing 11 forms. Through an appropriate training of
  • Edge region 26 may optionally be dispensed with a conventional nozzle disc in the prior art, it being provided for forming the seal of the combustion chamber 101 in a conventional manner that the fuel! Njektor 10 is acted upon in the axial direction in the direction of the combustion chamber 101 toward, for example by means of a non-illustrated
  • the additional element 21 or the sleeve 22 surrounds the first
  • Valve housing portion 12 preferably forming only a small radial gap 27. This ensures that a simple assembly or
  • Njektors 10 on or from the sealing element 20 is made possible because a sliding friction is formed between the sealing element 20 and the first valve housing portion 12, the valve housing 11 itself, however, can be easily inserted into the sleeve 22 and pulled out of this.
  • the edge region 26 allows easy mounting or dismounting of the sleeve 22.
  • the function of the sealing element 20 is in particular to avoid that condensate can get into the annular gap 27 between the sleeve 22 and the first valve housing portion 12. The purpose of this is the
  • Njektor 10 or its sealing element 20 and the additional element 21 can be turned away in a variety of ways or modified, without departing from the spirit.
  • the sleeve 22 with openings or the like can be turned away in a variety of ways or modified, without departing from the spirit.
  • the additional element 21 merely serves as a positioning element for axially positioning the sealing element 20 on the first valve housing section 12. It is also conceivable to fit the sleeve 22 by means of an interference fit or the like, e.g. by means of an adhesive connection to connect to the first valve housing portion 12. In this case, for example, can be dispensed with the edge region 26 of the additional element 21, when a nozzle sealing disc is used in the usual way.
  • the sealing element 20 in the manner of two
  • Front side 23 may be arranged.

Abstract

The invention relates to a fuel injector (10), particularly a common rail fuel injector, with a valve housing (11) that can be inserted into a receiving opening (106) of a cylinder head (100) in an internal combustion engine and, when in the installed position, has a first valve housing section (12) facing a combustion chamber (101) in the internal combustion engine. The first valve housing section (12) is made of metal and is radially surrounded on the side facing the combustion chamber (101) by a sealing element (20) that can be inserted into the annular space between the first valve housing section (12) and the receiving opening (106) in the region of a first receiving bore section (107).

Description

Beschreibung  description
Kraftstoff! njektor Fuel! njektor
Stand der Technik State of the art
Die Erfindung betrifft einen Kraftstoff! njektor nach dem Oberbegriff des The invention relates to a fuel! Njektor according to the preamble of
Anspruchs 1. Claim 1.
Ein derartiger, aus der Praxis bekannter Kraftstoff! njektor dient dem Einspritzen von Kraftstoff in den Brennraum einer Brennkraftmaschine. Hierzu weist die Brennkraftmaschine im Bereich eines den Brennraum begrenzenden Such, known from practice fuel! The injector is used to inject fuel into the combustion chamber of an internal combustion engine. For this purpose, the internal combustion engine in the region of a combustion chamber bounding
Zylinderkopfs eine Aufnahme in Form einer Stufenbohrung auf, in die derCylinder head on a recording in the form of a stepped bore, in which the
Kraftstoff! njektor mit seinem Ventilgehäuse eingesetzt ist. Dabei ragt der Kraftstoffinjektor mit wenigstens einer Düsenöffnung in den Brennraum der Brennkraftmaschine hinein. Um den Brennraum bzw. den Zylinderkopf nach außen hin abzudichten, ist das Injektorgehäuse des Kraftstoffinjektors üblicherweise unter Zwischenlage einer Düsendichtscheibe und mit axialerFuel! Njektor is inserted with its valve housing. In this case, the fuel injector protrudes into the combustion chamber of the internal combustion engine with at least one nozzle opening. In order to seal the combustion chamber or the cylinder head to the outside, the injector of the fuel injector is usually with the interposition of a nozzle disc and with axial
Vorspannung in der Aufnahmebohrung des Zylinderkopfes aufgenommen. Beim Betrieb der Brennkraftmaschine herrscht im Brennraum die höchste Temperatur, die im Zylinderkopf bzw. in der Aufnahmebohrung auf der dem Brennraum abgewandten Seite, in Abhängigkeit vom Abstand zum Brennraum, nach und nach abnimmt. In analoger Weise nimmt die Temperatur des Kraftstoffinjektors bzw. dessen Ventilgehäuses ebenfalls mit zunehmendem Abstand zum Preload received in the receiving bore of the cylinder head. During operation of the internal combustion engine, the highest temperature prevails in the combustion chamber, which gradually decreases in the cylinder head or in the receiving bore on the side facing away from the combustion chamber, as a function of the distance to the combustion chamber. In an analogous manner, the temperature of the fuel injector or its valve housing also increases with increasing distance
Brennraum ab. Insbesondere bei relativ geringen Brennraumtemperaturen oder bei relativ großem Abstand zum Brennraum kann es, unter anderem begünstigt zum Beispiel durch schwefelhaltigen Kraftstoff oder durch bei der Verbrennung des Kraftstoffs entstehendes Wasser, zur Kondensatbildung am Ventilgehäuse des Kraftstoff! njektors kommen. Da das Ventilgehäuse im Zylinderkopf über die Düsendichtscheibe nach außen hin abgedichtet ist, ist davon vor allem der Bereich axial knapp unterhalb der Düsendichtscheibe im Bereich eines ersten Aufnahmebohrungsabschnitts des Zylinderkopfs betroffen, da dort, relativ gesehen, die geringsten Temperaturen herrschen. Durch die Kondensatbildung kann es zu einer Korrosion des Ventilgehäuses in dem angesprochenen Bereich kommen, die über die Lebensdauer des Kraftstoff! njektors betrachtet zu einer Beeinträchtigung der Funktionsfähigkeit des Kraftstoffinjektors führen kann. Combustion chamber off. In particular, at relatively low combustion chamber temperatures or at a relatively large distance from the combustion chamber, it may favor, among other things, for example, by sulfur-containing fuel or resulting from the combustion of the fuel water to form condensate on the valve body of the fuel! come in njektors. Since the valve housing in the cylinder head is sealed to the outside via the nozzle sealing disk, the area axially below the nozzle sealing disk in the region of a first receiving bore section of the cylinder head is particularly affected, because there, in relative terms, the lowest temperatures prevail. The formation of condensation can lead to corrosion of the valve housing in the area mentioned come over the life of the fuel! Seen njektors considered can lead to an impairment of the functioning of the fuel injector.
Bei dem aus der Praxis bekannten Kraftstoffinjektor, der bei fremdgezündeten Brennkraftmaschinen (Benzinmotoren) eingesetzt wird, ist es daher bekannt, ein aus Kunststoff bestehendes Dichtelement vorzusehen, dass das Ventilgehäuse auf der dem Brennraum zugewandten Seite nahe dem Brennraum radial umgibt, sodass das Vordringen des Kondensats in Richtung zu der dem Brennraum abgewandten Seite des Kraftstoff! njektors zumindest erschwert ist. Das bekannte Dichtelement ist in einer radial umlaufenden Ringnut des Ventilgehäuses eingesetzt. Eine derartige Lösung ist bei der Übertragung auf eine In the fuel injector known from practice, which is used in spark-ignited internal combustion engines (gasoline engines), it is therefore known to provide a sealing element made of plastic, that the valve housing on the side facing the combustion chamber radially surrounding the combustion chamber, so that the penetration of the condensate towards the side of the fuel away from the combustion chamber! njektors is at least difficult. The known sealing element is inserted in a radially encircling annular groove of the valve housing. Such a solution is in the transmission to a
selbstzündende Brennkraftmaschine (Dieselmotor) nicht sinnvoll möglich, da durch die im Kraftstoffinjektor herrschenden höheren Drücke (im Vergleich zu den Drücken bei einem Injektor für eine fremdgezündete Brennkraftmaschine) eine Schwächung des Ventilgehäuses durch die Ringnut erfolgt, die zu einer Funktionsbeeinträchtigung führen würde. Alternativ hierzu müsste das auto-ignition internal combustion engine (diesel engine) does not make sense, since the prevailing in the fuel injector higher pressures (compared to the pressures in an injector for a spark-ignition internal combustion engine) a weakening of the valve housing takes place through the annular groove, which would lead to a functional impairment. Alternatively, this would have
Ventilgehäuse eine größere Wanddicke aufweisen, was in der Praxis aus verschiedensten Gründen weder erwünscht, noch möglich ist, da beispielsweise der Durchmesser der Aufnahmebohrung für den Kraftstoffinjektor im Bereich des Ventilgehäuses vorgegeben ist. Valve housing have a greater wall thickness, which is in practice for various reasons neither desired nor possible, since for example the diameter of the receiving bore for the fuel injector in the region of the valve housing is predetermined.
Aus der DE 101 25 943 A1 ist darüber hinaus ein Kraftstoffventil für From DE 101 25 943 A1 is also a fuel valve for
Brennkraftmaschinen bekannt, bei dem der dem Brennraum zugewandte Ventilgehäuseabschnitt von einer Hülse umgeben ist. Die aus der genannten Schrift bekannte Hülse dient jedoch einzig und allein der Festigkeitssteigerung des Ventilgehäuses. Internal combustion engines are known in which the combustion chamber facing the valve housing portion is surrounded by a sleeve. However, the sleeve known from the cited document is solely and solely the increase in strength of the valve housing.
Offenbarung der Erfindung Disclosure of the invention
Ausgehend von dem dargestellten Stand der Technik liegt der Erfindung die Aufgabe zugrunde, einen Kraftstoffinjektor, insbesondere einen Common-Rail- Injektor zum Einsatz in selbstzündenden Brennkraftmaschinen, nach dem Oberbegriff des Anspruchs 1 derart weiterzubilden, dass unter Verwendung eines Dichtelements, wie dies bei fremdgezündeten Brennkraftmaschinen bekannt ist, ein konstruktiv zumindest im Wesentlichen unverändertes, d.h. konventionelles Ventilgehäuse verwendet werden kann. Diese Aufgabe wird erfindungsgemäß bei einem Kraftstoffinjektor mit den Merkmalen des Anspruchs 1 dadurch gelöst, dass das Dichtelement mittels eines als separates Bauteil ausgebildeten Zusatzelements in axialer Richtung an dem ersten Based on the illustrated prior art, the present invention seeks to further develop a fuel injector, in particular a common rail injector for use in self-igniting internal combustion engines according to the preamble of claim 1 such that using a sealing element, as in spark-ignited internal combustion engines is known, a constructive at least substantially unchanged, ie Conventional valve body can be used. This object is achieved in a fuel injector with the features of claim 1, characterized in that the sealing element by means of a separate component formed as an additional element in the axial direction of the first
Ventilgehäuseabschnitt (12) positioniert ist. Im Gegensatz zum Stand der Technik ist es somit nicht erforderlich, das Ventilgehäuse mittels einer Ringnut o.ä. mit einer damit einhergehenden Schwächung des Ventilgehäuses bzw. einer vergrößerten Wanddicke zu versehen. Valve housing portion (12) is positioned. In contrast to the prior art, it is therefore not necessary, the valve housing by means of an annular groove o. to be provided with a concomitant weakening of the valve housing or an increased wall thickness.
Vorteilhafte Weiterbildungen des erfindungsgemäßen Kraftstoffinjektors sind in den Unteransprüchen aufgeführt. In den Rahmen der Erfindung fallen sämtliche Kombinationen aus zumindest zwei von in den Ansprüchen, der Beschreibung und/oder den Figuren offenbarten Merkmalen. Advantageous developments of the fuel injector according to the invention are listed in the subclaims. All combinations of at least two of the features disclosed in the claims, the description and / or the figures fall within the scope of the invention.
In konstruktiv bevorzugter, bei herstellungstechnisch besonders einfach realisierbarer Ausführung des Zusatzelements wird vorgeschlagen, dass das Zusatzelement in Form einer Hülse ausgebildet ist, die den ersten In structurally preferred embodiment of the additional element, which is particularly easy to produce, it is proposed that the additional element be designed in the form of a sleeve which encloses the first
Ventilgehäuseabschnitt radial, vorzugsweise mit geringem Spalt, umgibt. Eine derartige Ausbildung hat darüber hinaus den besonderen Vorteil, dass die Hülse in Art eines Schutzelements wirken kann bei der bei dem Vorhandensein von Kondensat zunächst die Hülse als Art„Opferelement" dient, bevor das Valve housing portion radially, preferably with a small gap surrounds. Such a design also has the particular advantage that the sleeve can act in the manner of a protective element in which in the presence of condensate initially the sleeve as a kind of "sacrificial element" is used before the
Kondensat das eigentliche Ventilgehäuse angreifen kann, falls es zu einem Versagen des Dichtelements kommen sollte. Condensate can attack the actual valve body, if it should come to a failure of the sealing element.
Um die erwähnte Schutzfunktion der Hülse zu maximieren bzw. das To maximize the mentioned protective function of the sleeve or the
Ventilgehäuse möglichst auf seiner gesamten Länge vor dem Kondensat zu schützen, ist es darüber hinaus vorgesehen, dass die Hülse auf der dem It is also envisaged that the sleeve on the the. To protect the valve housing as possible over its entire length from the condensate
Brennraum zugewandten Seite in dem ersten Aufnahmebohrungsabschnitt nahezu bis an den Brennraum und auf der dem Brennraum abgewandten Seite bis an einen sich an den ersten Venilgehäuseabschnitt anschließenden, im Vergleich zum ersten Ventilgehäuseabschnitt einen größeren Durchmesser aufweisenden zweiten Ventilgehäuseabschnitt reicht. Combustion chamber side facing in the first receiving bore portion almost to the combustion chamber and on the side facing away from the combustion chamber to a subsequent to the first Venilgehäuseabschnitt, compared to the first valve housing portion having a larger diameter second valve housing portion extends.
Besonders bevorzugt bei letztgenannter Ausbildung ist es darüber hinaus, wenn die Hülse auf der dem Dichtelement abgewandten Seite einen flanschförmig umlaufenden Randbereich aufweist, auf den in der Einbauposition die Stirnseite des zweiten Ventilgehäuseabschnitts aufliegt, und wenn der Randbereich auf einer Stufe der Aufnahmeöffnung aufliegt, von dem der erste Particularly preferred in the case of the last-mentioned embodiment, in addition, when the sleeve has a flange-shaped edge region on the side facing away from the sealing element, the end face is in the installation position the second valve housing portion rests, and when the edge portion rests on a stage of the receiving opening, of which the first
Aufnahmebohrungsabschnitt ausgeht. Bei einer derartigen Ausgestaltung kann gegebenenfalls auf die beim Stand der Technik üblicherweise verwendete Düsendichtscheibe verzichtet werden, und durch die Ausbildung des Receiving bore portion goes out. In such an embodiment may optionally be dispensed with the nozzle visor conventionally used in the prior art, and by the formation of the
flanschförmig umlaufenden Rands wird eine besonders sichere Anlage bzw. Auflage des Kraftstoff! njektors in der Aufnahmebohrung des Zylinderkopfs sowie die Möglichkeit einer besonders einfachen Montage sowie Demontage der Hülse in der Aufnahmeöffnung ermöglicht. flange-shaped peripheral edge is a particularly safe investment or support of the fuel! Njektors in the receiving bore of the cylinder head and the possibility of a particularly simple assembly and disassembly of the sleeve in the receiving opening allows.
Für den Fall, dass die Hülse dem Kondensat ausgesetzt ist, ist es zweckmäßig, dass diese gegenüber dem Kondensat möglichst resistent ist, d.h. durch die Einwirkung des Kondensats mechanisch bzw. chemisch nicht beschädigt wird. Daher ist es in weiterer Ausgestaltung der Erfindung vorgesehen, dass die Hülse aus einem inerten Material, insbesondere rostfreiem Stahl oder Kunststoff besteht. In the event that the sleeve is exposed to the condensate, it is appropriate that this is as resistant to the condensate as possible, i. is not mechanically or chemically damaged by the action of the condensate. Therefore, it is provided in a further embodiment of the invention that the sleeve consists of an inert material, in particular stainless steel or plastic.
Um einerseits eine möglichst gute Dichtwirkung des Dichtelements zu erzielen, und andererseits eine Beschädigung des Dichtelements über die Lebensdauer des Kraftstoffinjektors zu vermeiden, obwohl das Dichtelement insbesondere auch relativ hohen Brennraumtemperaturen ausgesetzt ist, wird darüber hinaus vorgeschlagen, dass das Dichtelement aus Kunststoff besteht, insbesondere basierend auf Viton, Silikon oder Teflon. On the one hand to achieve the best possible sealing effect of the sealing element, and on the other hand to avoid damage to the sealing element over the life of the fuel injector, although the sealing element is exposed in particular relatively high combustion chamber temperatures, it is also proposed that the sealing element consists of plastic, in particular based on Viton, silicone or Teflon.
Insbesondere ist es vorgesehen, dass das Dichtelement an der dem Brennraum zugewandten Stirnseite der Hülse angeordnet ist. Dadurch wird sichergestellt, dass das Dichtelement dasjenige Element ist, das beim Auftreten von Kondensat zuerst mit dem Kondensat in Wirkverbindung gelangt. In particular, it is provided that the sealing element is arranged on the combustion chamber facing the end face of the sleeve. This ensures that the sealing element is that element which first comes into operative connection with the condensate when condensate occurs.
Die Verbindung zwischen dem Kunststoff des Dichtelements und der Hülse wird erfindungsgemäß bevorzugt dadurch hergestellt, dass der Kunststoff des Dichtelements durch Anspritzen an die Stirnseite der Hülse oder durch The connection between the plastic of the sealing element and the sleeve is inventively preferably prepared by the fact that the plastic of the sealing element by injection molding on the end face of the sleeve or through
Eintauchen der Hülse in den verflüssigten Kunststoff des Dichtelements mit der Hülse verbunden ist. Für die Wirkung des Dichtelements ist es erfindungsgemäß besonders vorteilhaft, wenn das Dichtelement die Hülse radial zum ersten Dipping the sleeve is connected in the liquefied plastic of the sealing element with the sleeve. For the effect of the sealing element, it is particularly advantageous according to the invention, when the sealing element, the sleeve radially to the first
Ventilgehäuseabschnitt hin abdichtet. Dadurch wird insbesondere sichergestellt, dass beim Auftreten von Kondensat das Kondensat nicht in Wirkverbindung mit dem Ventilgehäuseabschnitt gelangt, da durch das Dichtelement der Radialspalt zwischen dem Ventilgehäuse und der Aufnahmeöffnung der Hülse abgedichtet wird. Valve housing section seals off. This ensures in particular that when condensate occurs, the condensate does not come into operative connection with the valve housing section, as is sealed by the sealing element of the radial gap between the valve housing and the receiving opening of the sleeve.
Darüber hinaus ist es besonders bevorzugt vorgesehen, dass das Dichtelement radial an dem ersten Aufnahmebohrungsabschnitt dichtend anliegt und dadurch den radialen Bereich zwischen der Hülse und dem ersten In addition, it is particularly preferably provided that the sealing element bears radially on the first receiving bore portion sealingly and thereby the radial area between the sleeve and the first
Aufnahmebohrungsabschnitt abdichtet. Dadurch wird sichergestellt, dass auch kein Kondensat in den radial umlaufenden Spalt zwischen dem Receiving bore section seals. This ensures that no condensate in the radial circumferential gap between the
Aufnahmebohrungsabschnitt und der Hülse gelangen kann, so dass die Hülse selbst auch vor der Einwirkung des Kondensats optimal geschützt ist. Receiving bore portion and the sleeve can pass, so that the sleeve itself is optimally protected against the action of condensate.
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 will become apparent from the following description of preferred embodiments and from the drawing.
Diese zeigt in: This shows in:
Fig. 1 eine Darstellung eines unteren Teils eines erfindungsgemäßen Fig. 1 is an illustration of a lower part of an inventive
Kraftstoff! njektors, bei dem dieser in einem Zylinderkopf einer  Fuel! Njektors, in which this in a cylinder head of a
Brennkraftmaschine angeordnet ist und  Internal combustion engine is arranged and
Fig. 2 eine zur Verwendung bei dem Kraftstoffinjektor gemäß Fig. 1 FIG. 2 shows one for use with the fuel injector according to FIG. 1. FIG
verwendete Hülse mit damit verbundenem Dichtelement, in  used sleeve with associated sealing element, in
Seitenansicht.  Side 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 in the figures with the same reference numerals.
In der Fig. 1 ist ausschnittsweise der obere Bereich einer selbstzündenden Brennkraftmaschine mit dessen Zylinderkopf 100 dargestellt. Der Zylinderkopf 100 begrenzt einen Brennraum 101 der Brennkraftmaschine, in dem ein Kolben 102 in üblicher weise auf- und abbeweglich in Richtung einer Längsachse 105 angeordnet ist. FIG. 1 shows a detail of the upper region of a self-igniting internal combustion engine with its cylinder head 100. The cylinder head 100 defines a combustion chamber 101 of the internal combustion engine, in which a piston 102 is arranged in the usual way up and down movable in the direction of a longitudinal axis 105.
Zur Aufnahme eines erfindungsgemäßen Kraftstoffinjektors 10, der insbesondere als Common-Rail-Injektor ausgebildet ist, weist der Zylinderkopf 100 eine Aufnahmeöffnung 106 in Form einer Stufenbohrung auf. Die AufnahmeöffnungTo accommodate a fuel injector 10 according to the invention, which is designed in particular as a common rail injector, the cylinder head 100 has a receiving opening 106 in the form of a stepped bore. The receiving opening
106 umfasst auf der dem Brennraum 101 zugewandten Seite einen ersten Aufnahmebohrungsabschnitt 107, an den sich auf der dem Brennraum 101 abgewandten Seite ein zweiter Aufnahmebohrungsabschnitt 108 anschließt. Die beiden Aufnahmebohrungsabschnitte 107, 108 sind über eine radial umlaufende Stufe 109 miteinander verbunden, wobei der erste Aufnahmebohrungsabschnitt106 includes on the combustion chamber 101 side facing a first receiving bore portion 107, to which a second receiving bore portion 108 connects to the side facing away from the combustion chamber 101 side. The two receiving bore portions 107, 108 are connected to each other via a radially encircling step 109, wherein the first receiving bore portion
107 einen geringeren Durchmesser aufweist als der zweite 107 has a smaller diameter than the second
Aufnahmebohrungsabschnitt 108, und wobei die beiden Receiving hole portion 108, and wherein the two
Aufnahmebohrungsabschnitte 107, 108 vorzugsweise jeweils zylindrisch ausgebildet sind. Receiving bore portions 107, 108 are preferably each cylindrical.
Der in der Fig. 1 vereinfacht dargestellte Kraftstoff! njektor 10 umfasst ein aus Metall bestehendes Ventilgehäuse 11 mit zwei einstückig miteinander verbundenen Ventilgehäuseabschnitten 12, 13. Der erste Ventilgehäuseabschnitt 12 weist einen geringeren Durchmesser auf als der zweite The simplified in Fig. 1 illustrated fuel! The injector 10 comprises a valve housing 11 made of metal with two valve housing sections 12, 13 connected in one piece with one another. The first valve housing section 12 has a smaller diameter than the second
Ventilgehäuseabschnitt 13, wobei die beiden Ventilgehäuseabschnitte 12, 13 vorzugsweise zylindrisch ausgebildet sind. Der erste Ventilgehäuseabschnitt 12 ist im Wesentlichen innerhalb des ersten Aufnahmebohrungsabschnitts 107 angeordnet, und der zweite Ventilgehäuseabschnitt 13 innerhalb des zweiten Aufnahmebohrungsabschnitts 108. Der erste Ventilgehäuseabschnitt 12 geht auf der dem Brennraum 101 zugewandten Seite in einen kuppelartigen Endbereich 14 über, in dessen Wand wenigstens eine Düsenöffnung 15 ausgebildet ist, über die Kraftstoff in den Brennraum 101 der Brennkraftmaschine eingespritzt werden kann. Das Einspritzen des Kraftstoffes erfolgt in an sich bekannter und daher nicht näher erläuterter, weil nicht erfindungswesentlicher Art und Weise insbesondere durch eine im Kraftstoffinjektor 10 angeordnete Düsennadel, die durch einen Aktuator betätigbar ist. Valve housing portion 13, wherein the two valve housing sections 12, 13 are preferably cylindrical. The first valve housing portion 12 is disposed substantially within the first receiving bore portion 107, and the second valve housing portion 13 within the second receiving bore portion 108. The first valve housing portion 12 merges on the side facing the combustion chamber 101 in a dome-like end portion 14, in whose wall at least one nozzle opening 15 is formed, can be injected via the fuel into the combustion chamber 101 of the internal combustion engine. The injection of the fuel takes place in a known per se and therefore not explained in more detail, because not essential to the invention in particular by a nozzle needle arranged in the fuel injector 10, which can be actuated by an actuator.
Während der erste Ventilgehäuseabschnitt 12 innerhalb des ersten While the first valve housing portion 12 within the first
Aufnahmebohrungsabschnitts 107 angeordnet ist, ragt der Endbereich 14 des Ventilgehäuses 1 1 in den Brennraum 101 hinein. Die Anordnung des Kraftstoff! njektors 10 zum Brennraum 101 bzw. zur Längsachse 105 ist dabei beispielhaft parallel zur Längsachse 105, sie kann jedoch auch schräg zur Längsachse 105 vorgesehen sein. Receiving bore portion 107 is arranged, the end portion 14 of the valve housing 1 1 protrudes into the combustion chamber 101. The arrangement of the Fuel! Njektors 10 to the combustion chamber 101 and the longitudinal axis 105 is exemplified parallel to the longitudinal axis 105, but it may also be provided obliquely to the longitudinal axis 105.
Beim Betrieb der Brennkraftmaschine herrscht innerhalb des Brennraums 101 eine relativ hohe Temperatur von beispielsweise einigen 100°C, die sich auf den Zylinderkopf 100 und auf den Kraftstoffinjektor 10 überträgt, wobei die During operation of the internal combustion engine, a relatively high temperature of, for example, some 100 ° C., which transfers to the cylinder head 100 and to the fuel injector 10, prevails within the combustion chamber 101, wherein the
Temperatur in der Aufnahmeöffnung 106 von dem ersten Temperature in the receiving opening 106 of the first
Aufnahmebohrungsabschnitt 107 in Richtung zum zweiten Receiving hole portion 107 toward the second
Aufnahmebohrungsabschnitt 108 hin abnimmt. Um zu vermeiden, dass das Ventilgehäuse 1 1 im Bereich des ersten Ventilgehäuseabschnitts 12, insbesondere im Übergangsbereich zum zweiten Ventilgehäuseabschnitt 13, in dem relativ gesehen die niedrigsten Temperaturen herrschen, durch Korrosion über die Betriebsdauer des Kraftstoff! njektors 10 betrachtet beschädigt wird, ist es erfindungsgemäß vorgesehen, dass der erste Ventilgehäuseabschnitt 12 innerhalb des ersten Aufnahmebohrungsabschnitts 107 radial von einem Dichtelement 20 umgeben ist. Receiving bore portion 108 decreases toward. In order to avoid that the valve housing 1 1 in the region of the first valve housing section 12, in particular in the transition region to the second valve housing section 13 in which relatively low temperatures prevail, by corrosion over the service life of the fuel! Seen njektors 10 is damaged, it is inventively provided that the first valve housing portion 12 within the first receiving bore portion 107 is radially surrounded by a sealing element 20.
Wie insbesondere anhand der Fig.1 erkennbar ist, ragt das Dichtelement 20 in Bezug zur Längsachse 105 nahezu bis an das der unteren Stirnfläche 1 11 des Zylinderkopfs 100 zugewandte Ende des ersten Aufnahmebohrungsabschnitts 107 heran. Das Dichtelement 20 ragt jedoch keinesfalls in den Brennraum 101 hinein. Das vorzugsweise aus (hitzebeständigem) Kunststoff, vorzugsweise basierend auf Viton, Silikon oder Teflon bestehende Dichtelement 20 ist an einem Zusatzelement 21 angeordnet bzw. befestigt. Das Zusatzelement 21 ist in Form einer Hülse 22 ausgebildet und besteht aus einem inerten Material, insbesondere rostfreiem Stahl oder Kunststoff. Das Dichtelement 20 ist an der dem Brennraum 101 zugewandten Stirnseite 23 der Hülse 22 angeordnet bzw. befestigt. Die Befestigung des Dichtelements 20 erfolgt entweder dadurch, dass das Dichtelement 20 an die Stirnseite 23 des Zusatzelements 21 angespritzt wird, beispielsweise mittels von im unmittelbaren Bereich der Stirnseite 23 angeordneten Flächenelementen, oder dadurch dass das Zusatzelement 21 mit seiner Stirnseite 23 in das zunächst verflüssigte Material des Dichtelements 20 eingetaucht wird und nach dessen Erstarrung an der Stirnseite 23 anhaftet. Vorteilhafterweise ist es vorgesehen, dass das Dichtelement 20 sowohl an seinem Außenumfang 24, als auch an seinem Innenumfang 25 vorzugsweise ballig ausgebildet ist, derart, dass der Außenumfang 24 des Dichtelements 20 dichtend an dem ersten Aufnahmebohrungsabschnitt 107 anliegt, während der Innenumfang 25 des Dichtelements 20 sich in dichtendem Anlagekontakt mit dem ersten Ventilgehäuseabschnitt 12 befindet. 1, the sealing element 20 protrudes in relation to the longitudinal axis 105 almost to the end of the first receiving bore section 107 facing the lower end face 11 of the cylinder head 100. However, the sealing element 20 does not project into the combustion chamber 101 in any way. The preferably made of (heat-resistant) plastic, preferably based on Viton, silicone or Teflon sealing element 20 is arranged or attached to an additional element 21. The additional element 21 is designed in the form of a sleeve 22 and consists of an inert material, in particular stainless steel or plastic. The sealing element 20 is arranged or attached to the combustion chamber 101 facing end face 23 of the sleeve 22. The attachment of the sealing element 20 is effected either by the fact that the sealing element 20 is molded onto the end face 23 of the additional element 21, for example by means of surface elements arranged in the immediate region of the end face 23, or by the additional element 21 with its end face 23 in the initially liquefied material of the sealing element 20 is immersed and adheres to the solidification of the end face 23. Advantageously, it is provided that the sealing element 20 is formed preferably convex both on its outer circumference 24 and on its inner circumference 25, such that the outer circumference 24 of the sealing element 20 bears sealingly against the first receiving bore section 107, while the inner circumference 25 of the sealing element 20 is in sealing abutting contact with the first valve housing section 12.
Das Zusatzelement 21 dient insbesondere der axialen Positionierung des Dichtelements 20 an der Außenseite des ersten Ventilgehäuseabschnitts 12. Hierzu weist das Zusatzelement 21 auf der dem Dichtelement 20 The additional element 21 is used in particular for the axial positioning of the sealing element 20 on the outside of the first valve housing section 12. For this purpose, the additional element 21 on the sealing element 20
gegenüberliegenden Stirnseite einen flanschförmig umlaufenden Randbereich 26 auf, dessen Außendurchmesser derart bemessen ist, dass der Randbereich 26 axial auf der Stufe 109 der Aufnahmeöffnung 106 aufliegt und somit gleichzeitig eine Auflagefläche für den zweiten Ventilgehäuseabschnitt 13 des opposite end face on a flange peripheral edge region 26, whose outer diameter is dimensioned such that the edge portion 26 rests axially on the step 109 of the receiving opening 106 and thus simultaneously a support surface for the second valve housing portion 13 of
Ventilgehäuses 11 bildet. Durch eine entsprechende Ausbildung des Valve housing 11 forms. Through an appropriate training of
Randbereichs 26 (Material, Form) kann gegebenenfalls auf eine beim Stand der Technik übliche Düsendichtscheibe verzichtet werden, wobei zum Ausbilden der Abdichtung des Brennraums 101 es in üblicher Art und Weise vorgesehen ist, dass der Kraftstoff! njektor 10 in axialer Richtung in Richtung zum Brennraum 101 hin kraftbeaufschlagt ist, beispielsweise mittels einer nicht dargestellten Edge region 26 (material, shape) may optionally be dispensed with a conventional nozzle disc in the prior art, it being provided for forming the seal of the combustion chamber 101 in a conventional manner that the fuel! Njektor 10 is acted upon in the axial direction in the direction of the combustion chamber 101 toward, for example by means of a non-illustrated
Spannpratze oder ähnlichem. Clamp or similar.
Das Zusatzelement 21 bzw. die Hülse 22 umgibt den ersten The additional element 21 or the sleeve 22 surrounds the first
Ventilgehäusabschnitt 12 vorzugsweise unter Ausbildung lediglich eines geringen radialen Spalts 27. Dadurch ist sichergestellt, dass eine einfache Montage bzw.Valve housing portion 12 preferably forming only a small radial gap 27. This ensures that a simple assembly or
Demontage des Kraftstoff! njektors 10 am bzw. vom Dichtelement 20 ermöglicht wird, da zwischen dem Dichtelement 20 und dem ersten Ventilgehäuseabschnitt 12 eine Gleitreibung ausgebildet ist, das Ventilgehäuse 11 selbst jedoch einfach in die Hülse 22 eingeführt bzw. aus dieser herausgezogen werden kann. Darüber hinaus ermöglicht der Randbereich 26 eine einfache Montage bzw. Demontage der Hülse 22. Disassembly of the fuel! Njektors 10 on or from the sealing element 20 is made possible because a sliding friction is formed between the sealing element 20 and the first valve housing portion 12, the valve housing 11 itself, however, can be easily inserted into the sleeve 22 and pulled out of this. In addition, the edge region 26 allows easy mounting or dismounting of the sleeve 22.
Die Funktion des Dichtelements 20 besteht darin insbesondere zu vermeiden, dass Kondensat in den ringförmigen Spalt 27 zwischen der Hülse 22 und dem ersten Ventilgehäuseabschnitt 12 gelangen kann. Hierzu dient die The function of the sealing element 20 is in particular to avoid that condensate can get into the annular gap 27 between the sleeve 22 and the first valve housing portion 12. The purpose of this is the
angesprochene Dichtwirkung des Dichtelements 20 zwischen seinem Innenumfang 25 zum ersten Ventilgehäuseabschnitt 12 hin. Darüber hinaus wird durch die dichte Anlage des Außenumfangs 24 des Dichtelements 20 an dem ersten Aufnahmebohrungsabschnitt 107 auch ein Vordringen von Kondensat in den ringförmigen Bereich 28 zwischen den ersten Aufnahmebohrungsabschnitt 107 und dem Außenumfang der Hülse 22 verhindert. Sollte dies trotzdem vorkommen, so wird durch die Materialwahl des Zusatzelements 21 sowie das Vorsehen des flanschförmig umlaufenden Randbereichs 26 ein Schutz des ersten Ventilgehäuseabschnitts 12 dadurch bewirkt, dass das Kondensat zunächst das Material des Zusatzelements 21 durchdringen muss, bevor es in Kontakt mit dem ersten Ventilgehäuseabschnitt 12 gelangt. addressed sealing effect of the sealing element 20 between his Inner circumference 25 to the first valve housing portion 12 out. In addition, by the dense contact of the outer periphery 24 of the sealing member 20 at the first receiving bore portion 107 and a penetration of condensate in the annular portion 28 between the first receiving bore portion 107 and the outer periphery of the sleeve 22 is prevented. Should this occur anyway, the choice of material of the additional element 21 and the provision of the flange-shaped peripheral edge portion 26, a protection of the first valve housing portion 12 is effected in that the condensate must first penetrate the material of the additional element 21 before it is in contact with the first valve housing section 12 arrived.
Der soweit beschriebene Kraftstoff! njektor 10 bzw. dessen Dichtelement 20 und das Zusatzelement 21 können in vielfältiger Art und Weise abgewandet bzw. modifiziert werden, ohne vom Erfindungsgedanken abzuweichen. So ist es beispielsweise denkbar, die Hülse 22 mit Öffnungen oder ähnlichem The fuel described so far! Njektor 10 or its sealing element 20 and the additional element 21 can be turned away in a variety of ways or modified, without departing from the spirit. Thus, it is conceivable, for example, the sleeve 22 with openings or the like
auszustatten, wenn auf die Schutzwirkung des Zusatzelements 21 mit Blick auf den ersten Ventilgehäuseabschnitt 12 verzichtet werden soll. In diesem Fall dient das Zusatzelement 21 lediglich als Positionierelement zum axialen Positionieren des Dichtelements 20 am ersten Ventilgehäuseabschnitt 12. Auch ist es denkbar, die Hülse 22 mittels einer Presspassung oder ähnlichem, z.B. mittels einer Klebeverbindung, mit dem ersten Ventilgehäuseabschnitt 12 zu verbinden. In diesem Fall kann beispielsweise auf den Randbereich 26 des Zusatzelements 21 verzichtet werden, wenn in üblicher Art und Weise eine Düsendichtscheibe verwendet wird. Zuletzt kann das Dichtelement 20 auch in Art zweier equip when it is desired to dispense with the protective effect of the additional element 21 with regard to the first valve housing section 12. In this case, the additional element 21 merely serves as a positioning element for axially positioning the sealing element 20 on the first valve housing section 12. It is also conceivable to fit the sleeve 22 by means of an interference fit or the like, e.g. by means of an adhesive connection to connect to the first valve housing portion 12. In this case, for example, can be dispensed with the edge region 26 of the additional element 21, when a nozzle sealing disc is used in the usual way. Finally, the sealing element 20 in the manner of two
Runddichtungen radial außen und innen an der Hülse 22 im Bereich der Round seals radially outside and inside of the sleeve 22 in the region of
Stirnseite 23 angeordnet sein. Front side 23 may be arranged.

Claims

Ansprüche claims
1. Kraftstoff! njektor (10), insbesondere Common-Rail-Injektor, mit einem 1. Fuel! Njektor (10), in particular common rail injector, with a
Ventilgehäuse (1 1), das in eine Aufnahmeöffnung (106) eines Zylinderkopfs Valve housing (1 1), in a receiving opening (106) of a cylinder head
(100) einer Brennkraftmaschine einsetzbar ist und in der Einbauposition einen einem Brennraum (101) der Brennkraftmaschine zugewandten ersten Ventilgehäuseabschnitt (12) aufweist, wobei der erste (100) of an internal combustion engine is used and in the installed position a combustion chamber (101) of the internal combustion engine facing first valve housing portion (12), wherein the first
Ventilgehäuseabschnitt (12) aus Metall besteht und auf der dem Brennraum Valve housing portion (12) consists of metal and on the combustion chamber
(101) zugewandten Seite radial von einem Dichtelement (20) umgeben ist, das in den ringförmigen Raum zwischen dem ersten Ventilgehäuseabschnitt (12) und der Aufnahmeöffnung (106) im Bereich eines ersten (101) facing radially from a sealing element (20) which in the annular space between the first valve housing portion (12) and the receiving opening (106) in the region of a first
Aufnahmebohrungsabschnitt (107) einsetzbar ist, dadurch gekennzeichnet, dass das Dichtelement (20) mittels eines als separates Bauteil ausgebildeten Zusatzelements (21) in axialer Richtung an dem ersten  Receiving bore portion (107) can be inserted, characterized in that the sealing element (20) by means of an additional element formed as a separate component (21) in the axial direction on the first
Ventilgehäuseabschnitt (12) positioniert ist.  Valve housing portion (12) is positioned.
2. Kraftstoffinjektor nach Anspruch 1 , 2. Fuel injector according to claim 1,
dadurch gekennzeichnet,  characterized,
dass das Zusatzelement (21) in Form einer Hülse (22) ausgebildet ist, die den ersten Ventilgehäuseabschnitt (12) radial, vorzugsweise mit geringem Spalt (27), umgibt.  in that the additional element (21) is designed in the form of a sleeve (22) which surrounds the first valve housing section (12) radially, preferably with a small gap (27).
3. Kraftstoff! njektor nach Anspruch 2, 3. Fuel! A nudger according to claim 2,
dadurch gekennzeichnet,  characterized,
dass die Hülse (22) auf der dem Brennraum (101) zugewandten Seite in dem ersten Aufnahmebohrungsabschnitt (107) nahezu bis an den  that the sleeve (22) on the combustion chamber (101) facing side in the first receiving bore portion (107) almost to the
Brennraum (101) und auf der dem Brennraum (101) abgewandten Seite bis an einen sich an den ersten Ventilgehäuseabschnitt (12) anschließenden, im Vergleich zum ersten Ventilgehäuseabschnitt (12) einen größeren Combustion chamber (101) and on the side facing away from the combustion chamber (101) side to a subsequent to the first valve housing portion (12), in Compared to the first valve housing section (12) a larger one
Durchmesser aufweisenden zweiten Ventilgehäuseabschnitt (13) reicht. Diameter having second valve housing portion (13) extends.
Kraftstoffinjektor nach Anspruch 3, Fuel injector according to claim 3,
dadurch gekennzeichnet, characterized,
dass die Hülse (22) auf der dem Dichtelement (20) abgewandten Seite einen flanschförmig umlaufenden Randbereich (26) aufweist, auf den in der Einbauposition die Stirnseite des zweiten Ventilgehäuseabschnitts (13) aufliegt, und dass der Randbereich (26) auf einer Stufe (109) der in that the sleeve (22) has on the side facing away from the sealing element (20) a flange-shaped edge region (26) on which the end face of the second valve housing section (13) rests in the installed position, and in that the edge region (26) 109) the
Aufnahmeöffnung (106) aufliegt, von dem der erste Receiving opening (106) rests, of which the first
Aufnahmebohrungsabschnitt (107) ausgeht. Receiving hole portion (107) goes out.
Kraftstoffinjektor nach einem der Ansprüche 2 bis 4, Fuel injector according to one of claims 2 to 4,
dadurch gekennzeichnet, characterized,
dass die Hülse (22) aus einem inerten Material, insbesondere rostfreiem Stahl oder Kunststoff besteht. in that the sleeve (22) consists of an inert material, in particular stainless steel or plastic.
Kraftstoffinjektor nach einem der Ansprüche 2 bis 5, Fuel injector according to one of claims 2 to 5,
dadurch gekennzeichnet, characterized,
dass das Dichtelement (20) aus Kunststoff, vorzugsweise basierend auf Viton, Silikon oder Teflon, besteht. in that the sealing element (20) consists of plastic, preferably based on viton, silicone or Teflon.
Kraftstoffinjektor nach Anspruch 6, Fuel injector according to claim 6,
dadurch gekennzeichnet, characterized,
dass das Dichtelement (20) im Bereich der dem Brennraum (101) zugewandten Stirnseite (23) der Hülse (22) angeordnet ist. the sealing element (20) is arranged in the region of the end face (23) of the sleeve (22) facing the combustion chamber (101).
Kraftstoffinjektor nach Anspruch 7, Fuel injector according to claim 7,
dadurch gekennzeichnet, characterized,
dass der Kunststoff des Dichtelements (20) durch Anspritzen an die that the plastic of the sealing element (20) by injection molding on the
Stirnseite (23) der Hülse (22), beispielsweise mittels im Bereich der End face (23) of the sleeve (22), for example by means in the region of
Stirnseite (23) angeordneter Flächenelemente, oder durch Eintauchen der Hülse (22) in den verflüssigten Kunststoff des Dichtelements (20) mit der Hülse (22) verbunden ist. End face (23) arranged surface elements, or by immersion of the sleeve (22) in the liquefied plastic of the sealing element (20) with the sleeve (22) is connected.
Kraftstoffinjektor nach einem der Ansprüche 2 bis 8, dadurch gekennzeichnet, Fuel injector according to one of claims 2 to 8, characterized,
dass das Dichtelement (20) die Hülse (22) radial zum ersten Ventilgehäuseabschnitt (12) hin abdichtet.  the sealing element (20) seals the sleeve (22) radially towards the first valve housing section (12).
10. Kraftstoffinjektor nach Anspruch 9, 10. Fuel injector according to claim 9,
dadurch gekennzeichnet,  characterized,
dass das Dichtelement (20) radial an dem ersten  in that the sealing element (20) acts radially on the first
Aufnahmebohrungsabschnitt (107) dichtend anliegt und dadurch den radialen Bereich (28) zwischen der Hülse (22) und dem ersten Aufnahmebohrungsabschnitt (107) abdichtet.  Receiving bore portion (107) sealingly abuts and thereby seals the radial portion (28) between the sleeve (22) and the first receiving bore portion (107).
EP13766372.0A 2012-10-26 2013-09-26 Fuel injector Active EP2912301B1 (en)

Applications Claiming Priority (2)

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DE102012219654.4A DE102012219654A1 (en) 2012-10-26 2012-10-26 fuel injector
PCT/EP2013/070066 WO2014063898A1 (en) 2012-10-26 2013-09-26 Fuel injector

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EP2912301A1 true EP2912301A1 (en) 2015-09-02
EP2912301B1 EP2912301B1 (en) 2017-04-12

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CN (1) CN104769270B (en)
BR (1) BR112015009282B1 (en)
DE (1) DE102012219654A1 (en)
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CN104769270B (en) 2018-02-13
US9488143B2 (en) 2016-11-08
WO2014063898A1 (en) 2014-05-01
DE102012219654A1 (en) 2014-04-30
CN104769270A (en) 2015-07-08
EP2912301B1 (en) 2017-04-12
US20150252766A1 (en) 2015-09-10
BR112015009282B1 (en) 2021-01-19
BR112015009282A2 (en) 2017-07-04

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