EP2912301B1 - Fuel injector - Google Patents
Fuel injector Download PDFInfo
- Publication number
- EP2912301B1 EP2912301B1 EP13766372.0A EP13766372A EP2912301B1 EP 2912301 B1 EP2912301 B1 EP 2912301B1 EP 13766372 A EP13766372 A EP 13766372A EP 2912301 B1 EP2912301 B1 EP 2912301B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- valve housing
- sleeve
- sealing element
- fuel injector
- housing portion
- 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.)
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Links
- 239000000446 fuel Substances 0.000 title claims description 44
- 238000007789 sealing Methods 0.000 claims description 59
- 238000002485 combustion reaction Methods 0.000 claims description 55
- 239000004033 plastic Substances 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 7
- 229920002449 FKM Polymers 0.000 claims description 3
- 239000004809 Teflon Substances 0.000 claims description 3
- 229920006362 Teflon® Polymers 0.000 claims description 3
- 229920001296 polysiloxane Polymers 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 238000001746 injection moulding Methods 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims description 2
- 238000007598 dipping method Methods 0.000 claims 1
- 230000002093 peripheral effect Effects 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000006870 function Effects 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 230000003313 weakening effect Effects 0.000 description 2
- 241000209035 Ilex Species 0.000 description 1
- 240000001439 Opuntia Species 0.000 description 1
- 235000004727 Opuntia ficus indica Nutrition 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 210000000078 claw Anatomy 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000009760 functional impairment Effects 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000009993 protective function Effects 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
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 injector according to the preamble of claim 1.
- Such, known from practice fuel injector is used for injecting fuel into the combustion chamber of an internal combustion engine.
- the internal combustion engine in the region of a cylinder head defining the combustion chamber has a receptacle in the form of a stepped bore into which the fuel injector with its valve housing is inserted.
- 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 added with the interposition of a nozzle disc and with axial bias 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 decreases with increasing distance to the combustion chamber.
- it may favor condensate formation on the valve housing of the fuel injector, inter alia favored by, for example, sulfur-containing fuel or resulting from the combustion of the fuel water.
- 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 considered that over the life of the fuel injector considered can lead to a deterioration of the functionality of the fuel injector.
- valve housing would have to have a greater wall thickness, which is neither desirable nor possible in practice for various reasons, since, for example, the diameter of the receiving bore for the fuel injector in the region of the valve housing is predetermined.
- a sealing device for sealing a fuel injection valve is known.
- the invention has the object, 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, such as this is known in spark-ignited internal combustion engines, 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 is positioned by means of a separate component formed as an additional element in the axial direction of the first valve housing portion.
- 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 is in the form of a sleeve which surrounds the first valve housing portion radially, preferably with a small gap.
- a sleeve which surrounds the first valve housing portion radially, preferably with a small gap.
- the sleeve can act in the manner of a protective element in which in the presence of condensate initially the sleeve as a kind "sacrificial element" is used before the condensate can attack the actual valve body, if there is a failure of the sealing element should come.
- the sleeve extends according to claim 1 on the side facing the combustion chamber in the first receiving bore portion almost to the combustion chamber and on the combustion chamber facing away Side up to a subsequent to the first valve housing portion, in comparison to the first valve housing portion having a larger diameter second valve housing portion.
- the sleeve according to claim 1 on the side facing away from the sealing element on a flange peripheral edge region, on the in the installed position the end face the second valve housing portion rests, and when the edge region rests on a step of the receiving opening from which the first receiving bore portion extends.
- the nozzle disc commonly used in the prior art
- the formation of the flange peripheral edge is a particularly secure investment or edition of the fuel injector in the receiving bore of the cylinder head and the possibility of a particularly simple assembly and disassembly allows the sleeve in the receiving opening.
- 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 according to the invention is preferably prepared in that the plastic of the sealing element is connected by injection molding on the end face of the sleeve or by immersion of the sleeve in the liquefied plastic of the sealing element with the sleeve.
- the sealing element seals the sleeve radially towards the first valve housing section. 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 sealingly rests radially on the first receiving bore portion and thereby seals the radial region between the sleeve and the first receiving bore portion. This ensures that no condensate can pass into the radially circumferential gap between the receiving bore portion and the sleeve, so that the sleeve itself is optimally protected against the action of the condensate.
- FIG. 1 is fragmentary the upper portion of a self-igniting internal combustion engine with the cylinder head 100 shown.
- 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 comprises, on the side facing the combustion chamber 101, a first receiving bore section 107, to which a second receiving bore section 108 adjoins on the side facing away from the combustion chamber 101.
- 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 has a smaller diameter than the second receiving bore portion 108, and wherein the two receiving bore portions 107, 108 are preferably each cylindrical.
- Fuel injector 10 shown in simplified form comprises a valve housing 11 made of metal with two valve housing sections 12, 13.
- the first valve housing section 12 has a smaller diameter than the second valve housing section 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.
- first valve housing portion 12 While the first valve housing portion 12 is disposed within the first receiving bore portion 107, the end portion 14 of the valve housing 11 projects into the combustion chamber 101.
- the arrangement of the Fuel injector 10 to the combustion chamber 101 and to the longitudinal axis 105 is, for example, parallel to the longitudinal axis 105, but it may also be provided obliquely to the longitudinal axis 105.
- the sealing element 20 protrudes in relation to the longitudinal axis 105 almost to the lower end face 111 of the cylinder head 100 facing the end of the first receiving bore portion 107 zoom.
- 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 carried out 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 area 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.
- edge region 26 material, shape
- a customary in the prior art nozzle disc wherein for forming the seal of the combustion chamber 101 it is provided in a conventional manner that the fuel injector 10 in the axial direction in Direction to the combustion chamber 101 is subjected to force, for example by means of a clamping claw, not shown, or the like.
- the additional element 21 or the sleeve 22 surrounds the first valve housing section 12 preferably forming only a small radial gap 27. This ensures that a simple assembly and disassembly of the fuel injector 10 is made possible on or by the sealing element 20, as between the sealing element 20 and the first valve housing portion 12, a sliding friction is formed, 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. This is the purpose of the aforementioned sealing effect of the sealing element 20 between his Inner circumference 25 to the first valve housing portion 12 out.
- 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 circumference of the sleeve 22 is prevented.
- the fuel injector 10 described so far or its sealing element 20 and the additional element 21 can be turned away or modified in many ways without departing from the spirit of the invention.
- the additional element 21 merely serves as a positioning element for axially positioning the sealing element 20 on the first valve housing section 12.
- 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.
- the sealing element 20 can also be arranged in the manner of two round seals radially on the outside and inside of the sleeve 22 in the region of the end face 23.
Description
Die Erfindung betrifft einen Kraftstoffinjektor nach dem Oberbegriff des Anspruchs 1.The invention relates to a fuel injector according to the preamble of claim 1.
Ein derartiger, aus der Praxis bekannter Kraftstoffinjektor dient dem Einspritzen von Kraftstoff in den Brennraum einer Brennkraftmaschine. Hierzu weist die Brennkraftmaschine im Bereich eines den Brennraum begrenzenden Zylinderkopfs eine Aufnahme in Form einer Stufenbohrung auf, in die der Kraftstoffinjektor 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 axialer 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 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 Kraftstoffinjektors 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 Kraftstoffinjektors betrachtet zu einer Beeinträchtigung der Funktionsfähigkeit des Kraftstoffinjektors führen kann.Such, known from practice fuel injector is used for injecting fuel into the combustion chamber of an internal combustion engine. For this purpose, the internal combustion engine in the region of a cylinder head defining the combustion chamber has a receptacle in the form of a stepped bore into which the fuel injector with its valve housing is inserted. 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 added with the interposition of a nozzle disc and with axial bias 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 decreases with increasing distance to the combustion chamber. In particular, at relatively low combustion chamber temperatures or at a relatively large distance from the combustion chamber, it may favor condensate formation on the valve housing of the fuel injector, inter alia favored by, for example, sulfur-containing fuel or resulting from the combustion of the fuel water. 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 considered that over the life of the fuel injector considered can lead to a deterioration of the functionality 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 Kraftstoffinjektors zumindest erschwert ist. Das bekannte Dichtelement ist in einer radial umlaufenden Ringnut des Ventilgehäuses eingesetzt. Eine derartige Lösung ist bei der Übertragung auf eine 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 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.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 in the direction of the combustion chamber facing away from the side of the fuel injector is at least difficult. The known sealing element is inserted in a radially encircling annular groove of the valve housing. Such a solution is not meaningfully possible in the transmission to a self-igniting internal combustion engine (diesel engine), since by the prevailing in the fuel injector higher pressures (compared to the pressures of an injector for a spark-ignition internal combustion engine) a weakening of the valve housing takes place through the annular groove, the would lead to a functional impairment. Alternatively, the valve housing would have to have a greater wall thickness, which is neither desirable nor possible in practice for various reasons, since, for example, the diameter of the receiving bore for the fuel injector in the region of the valve housing is predetermined.
Aus der
Aus der
Im Einklang mit den Merkmalen des Anspruchs 1 bei herstellungstechnisch besonders einfach realisierbarer Ausführung des Zusatzelements ist das Zusatzelement in Form einer Hülse ausgebildet, die den ersten 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 Kondensat das eigentliche Ventilgehäuse angreifen kann, falls es zu einem Versagen des Dichtelements kommen sollte.In accordance with the features of claim 1 in manufacturing technically particularly easy to implement the additional element, the additional element is in the form of a sleeve which surrounds the first valve housing portion radially, preferably with a small gap. 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 "sacrificial element" is used before the condensate can attack the actual valve body, if there is a failure of the sealing element should come.
Um die erwähnte Schutzfunktion der Hülse zu maximieren bzw. das Ventilgehäuse möglichst auf seiner gesamten Länge vor dem Kondensat zu schützen, reicht die Hülse gemäß Anspruch 1 auf der dem 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 Ventilgehäuseabschnitt anschließenden, im Vergleich zum ersten Ventilgehäuseabschnitt einen größeren Durchmesser aufweisenden zweiten Ventilgehäuseabschnitt.In order to maximize the aforementioned protective function of the sleeve or to protect the valve housing as possible over its entire length from the condensate, the sleeve extends according to claim 1 on the side facing the combustion chamber in the first receiving bore portion almost to the combustion chamber and on the combustion chamber facing away Side up to a subsequent to the first valve housing portion, in comparison to the first valve housing portion having a larger diameter second valve housing portion.
Darüber hinaus weist die Hülse nach Anspruch 1 auf der dem Dichtelement abgewandten Seite einen flanschförmig umlaufenden Randbereich auf, 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 Aufnahmebohrungsabschnitt ausgeht. Bei einer derartigen Ausgestaltung kann gegebenenfalls auf die beim Stand der Technik üblicherweise verwendete Düsendichtscheibe verzichtet werden, und durch die Ausbildung des flanschförmig umlaufenden Rands wird eine besonders sichere Anlage bzw. Auflage des Kraftstoffinjektors in der Aufnahmebohrung des Zylinderkopfs sowie die Möglichkeit einer besonders einfachen Montage sowie Demontage der Hülse in der Aufnahmeöffnung ermöglicht.
Vorteilhafte Weiterbildungen des erfindungsgemäßen Kraftstoffinjektors sind in den Unteransprüchen aufgeführt.In addition, the sleeve according to claim 1 on the side facing away from the sealing element on a flange peripheral edge region, on the in the installed position the end face the second valve housing portion rests, and when the edge region rests on a step of the receiving opening from which the first receiving bore portion extends. In such an embodiment may optionally be dispensed with the nozzle disc commonly used in the prior art, and the formation of the flange peripheral edge is a particularly secure investment or edition of the fuel injector in the receiving bore of the cylinder head and the possibility of a particularly simple assembly and disassembly allows the sleeve in the receiving opening.
Advantageous developments of the fuel injector according to the invention are listed in the subclaims.
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 Eintauchen der Hülse in den verflüssigten Kunststoff des Dichtelements mit der Hülse verbunden ist.The connection between the plastic of the sealing element and the sleeve according to the invention is preferably prepared in that the plastic of the sealing element is connected by injection molding on the end face of the sleeve or by immersion of the sleeve in the liquefied plastic of the sealing element with the sleeve.
Für die Wirkung des Dichtelements ist es erfindungsgemäß besonders vorteilhaft, wenn das Dichtelement die Hülse radial zum ersten 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.For the effect of the sealing element, it is particularly advantageous according to the invention if the sealing element seals the sleeve radially towards the first valve housing section. 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 Aufnahmebohrungsabschnitt abdichtet. Dadurch wird sichergestellt, dass auch kein Kondensat in den radial umlaufenden Spalt zwischen dem Aufnahmebohrungsabschnitt und der Hülse gelangen kann, so dass die Hülse selbst auch vor der Einwirkung des Kondensats optimal geschützt ist.In addition, it is particularly preferably provided that the sealing element sealingly rests radially on the first receiving bore portion and thereby seals the radial region between the sleeve and the first receiving bore portion. This ensures that no condensate can pass into the radially circumferential gap between the receiving bore portion and the sleeve, so that the sleeve itself is optimally protected against the action of the 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:
- Fig. 1
- eine Darstellung eines unteren Teils eines erfindungsgemäßen Kraftstoffinjektors, bei dem dieser in einem Zylinderkopf einer Brennkraftmaschine angeordnet ist und
- Fig. 2
- eine zur Verwendung bei dem Kraftstoffinjektor gemäß
Fig. 1 verwendete Hülse mit damit verbundenem Dichtelement, in Seitenansicht.
- Fig. 1
- a representation of a lower part of a fuel injector according to the invention, in which this is arranged in a cylinder head of an internal combustion engine and
- Fig. 2
- one for use in the fuel injector according to
Fig. 1 used sleeve with associated sealing element, in 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
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 Aufnahmeöffnung 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 Aufnahmebohrungsabschnitt 107 einen geringeren Durchmesser aufweist als der zweite Aufnahmebohrungsabschnitt 108, und wobei die beiden Aufnahmebohrungsabschnitte 107, 108 vorzugsweise jeweils zylindrisch ausgebildet sind.To accommodate a
Der in der
Während der erste Ventilgehäuseabschnitt 12 innerhalb des ersten Aufnahmebohrungsabschnitts 107 angeordnet ist, ragt der Endbereich 14 des Ventilgehäuses 11 in den Brennraum 101 hinein. Die Anordnung des Kraftstoffinjektors 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.While the first
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 Temperatur in der Aufnahmeöffnung 106 von dem ersten Aufnahmebohrungsabschnitt 107 in Richtung zum zweiten Aufnahmebohrungsabschnitt 108 hin abnimmt. Um zu vermeiden, dass das Ventilgehäuse 11 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 Kraftstoffinjektors 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.During operation of the internal combustion engine, a relatively high temperature of, for example, some 100 ° C., which transfers to the
Wie insbesondere anhand der
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.Advantageously, it is provided that the sealing
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 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 Ventilgehäuses 11 bildet. Durch eine entsprechende Ausbildung des 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 Kraftstoffinjektor 10 in axialer Richtung in Richtung zum Brennraum 101 hin kraftbeaufschlagt ist, beispielsweise mittels einer nicht dargestellten Spannpratze oder ähnlichem.The additional element 21 is used in particular for the axial positioning of the sealing
Das Zusatzelement 21 bzw. die Hülse 22 umgibt den ersten Ventilgehäusabschnitt 12 vorzugsweise unter Ausbildung lediglich eines geringen radialen Spalts 27. Dadurch ist sichergestellt, dass eine einfache Montage bzw. Demontage des Kraftstoffinjektors 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.The additional element 21 or the sleeve 22 surrounds the first
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 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.The function of the sealing
Der soweit beschriebene Kraftstoffinjektor 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 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 Runddichtungen radial außen und innen an der Hülse 22 im Bereich der Stirnseite 23 angeordnet sein.The
Claims (7)
- Fuel injector (10), in particular common rail injector, with a valve housing (11) which can be inserted into a receiving opening (106) of a cylinder head (100) of an internal combustion engine and, in the installed position, has a first valve housing portion (12) facing a combustion chamber (101) of the internal combustion engine, wherein the first valve housing portion (12) is composed of metal and, on the side facing the combustion chamber (101), is surrounded radially by a sealing element (20) which can be inserted into the annular space between the first valve housing portion (12) and the receiving opening (106) in the region of a first receiving bore portion (107) and which sealing element (20) is positioned radially, preferably with a small gap (27) with respect to the first valve housing portion (12), on the first valve housing portion (12) in the axial direction by means of an additional element (21) embodied as a separate component in the form of a sleeve (22),
characterized
in that the sleeve (22), on the side facing the combustion chamber (101), reaches in the first receiving bore portion (107) virtually as far as the combustion chamber (101) and, on the side facing away from the combustion chamber (101), reaches as far as a second valve housing portion (13) which adjoins the first valve housing portion (12) and has a larger diameter in comparison to the first valve housing portion (12) and which sleeve (22), on the side facing away from the sealing element (20), has an edge region (26) which encircles the sleeve in a flange-shaped manner and on which, in the installed position, the end side of the second valve housing portion (13) rests, and in that the edge region (26) from which the first receiving bore portion (107) emerges rests on a step (109) of the receiving opening (106). - Fuel injector according to Claim 1, characterized in that the sleeve (22) is composed of an inert material, in particular stainless steel or plastic.
- Fuel injector according to Claim 1 or 2, characterized in that the sealing element (20) is composed of plastic, preferably based on Viton, silicone or Teflon.
- Fuel injector according to Claim 3, characterized in that the sealing element (20) is arranged in the region of that end side (23) of the sleeve (22) which faces the combustion chamber (101).
- Fuel injector according to Claim 4, characterized in that the plastic of the sealing element (20) is connected to the sleeve (22) by injection molding onto the end side (23) of the sleeve (22), for example by means of plane elements arranged in the region of the end side (23), or by dipping the sleeve (22) into the liquefied plastic of the sealing element (20).
- Fuel injector according to one of Claims 1 to 5, characterized in that the sealing element (20) seals the sleeve (22) radially toward the first valve housing portion (12).
- Fuel injector according to Claim 6, characterized in that the sealing element (20) bears radially in a sealing manner against the first receiving bore portion (107) and thereby seals the radial region (28) between the sleeve (22) and the first receiving bore portion (107).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
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 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2912301A1 EP2912301A1 (en) | 2015-09-02 |
EP2912301B1 true EP2912301B1 (en) | 2017-04-12 |
Family
ID=49231501
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP13766372.0A Active EP2912301B1 (en) | 2012-10-26 | 2013-09-26 | Fuel injector |
Country Status (6)
Country | Link |
---|---|
US (1) | US9488143B2 (en) |
EP (1) | EP2912301B1 (en) |
CN (1) | CN104769270B (en) |
BR (1) | BR112015009282B1 (en) |
DE (1) | DE102012219654A1 (en) |
WO (1) | WO2014063898A1 (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102013212321A1 (en) | 2013-06-26 | 2014-12-31 | Robert Bosch Gmbh | fuel injector |
DE102015223605A1 (en) * | 2015-11-27 | 2017-06-01 | Robert Bosch Gmbh | Injector arrangement with thermal protection sleeve |
CA2950198C (en) * | 2015-12-02 | 2023-12-12 | Aaron Di Pietro | Fuel injector insert |
DE102015225055A1 (en) | 2015-12-14 | 2017-06-14 | Robert Bosch Gmbh | fuel injector |
GB2620755A (en) * | 2022-07-20 | 2024-01-24 | Jcb Res | Fuel injector seal |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3695235A (en) * | 1970-08-26 | 1972-10-03 | Mcculloch Corp | Heat seal for fuel injection nozzles |
DE2908095C2 (en) | 1979-03-02 | 1984-02-16 | Robert Bosch Gmbh, 7000 Stuttgart | Fuel injection system for internal combustion engines |
DE10108194A1 (en) * | 2001-02-21 | 2002-08-29 | Bosch Gmbh Robert | Sealing device for a fuel injector |
DE10108195A1 (en) * | 2001-02-21 | 2002-08-22 | Bosch Gmbh Robert | Fuel injector |
DE10125943A1 (en) | 2001-05-29 | 2002-12-05 | Bosch Gmbh Robert | Fuel injection valve for internal combustion engines |
US6866026B2 (en) * | 2002-08-28 | 2005-03-15 | Federal-Mogul World Wide, Inc. | Gasket for fuel injector |
JP5003934B2 (en) * | 2006-09-07 | 2012-08-22 | 内山工業株式会社 | gasket |
US7383818B1 (en) * | 2007-04-04 | 2008-06-10 | Gm Global Technology Operations, Inc. | Fuel injector with secondary combustion seal |
DE102009000285A1 (en) * | 2009-01-19 | 2010-07-22 | Robert Bosch Gmbh | Fuel injector as well as internal combustion engine with fuel injector |
-
2012
- 2012-10-26 DE DE102012219654.4A patent/DE102012219654A1/en not_active Withdrawn
-
2013
- 2013-09-26 US US14/438,664 patent/US9488143B2/en active Active
- 2013-09-26 CN CN201380056152.7A patent/CN104769270B/en active Active
- 2013-09-26 EP EP13766372.0A patent/EP2912301B1/en active Active
- 2013-09-26 BR BR112015009282-9A patent/BR112015009282B1/en active IP Right Grant
- 2013-09-26 WO PCT/EP2013/070066 patent/WO2014063898A1/en active Application Filing
Non-Patent Citations (1)
Title |
---|
None * |
Also Published As
Publication number | Publication date |
---|---|
CN104769270B (en) | 2018-02-13 |
US9488143B2 (en) | 2016-11-08 |
WO2014063898A1 (en) | 2014-05-01 |
DE102012219654A1 (en) | 2014-04-30 |
EP2912301A1 (en) | 2015-09-02 |
CN104769270A (en) | 2015-07-08 |
US20150252766A1 (en) | 2015-09-10 |
BR112015009282B1 (en) | 2021-01-19 |
BR112015009282A2 (en) | 2017-07-04 |
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