EP2336547B1 - Injection valve with device for testing of the cylinder head gasket - Google Patents

Injection valve with device for testing of the cylinder head gasket Download PDF

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Publication number
EP2336547B1
EP2336547B1 EP20100189171 EP10189171A EP2336547B1 EP 2336547 B1 EP2336547 B1 EP 2336547B1 EP 20100189171 EP20100189171 EP 20100189171 EP 10189171 A EP10189171 A EP 10189171A EP 2336547 B1 EP2336547 B1 EP 2336547B1
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EP
European Patent Office
Prior art keywords
plastic body
housing
cylinder head
valve
injection valve
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP20100189171
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German (de)
French (fr)
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EP2336547A1 (en
Inventor
Thomas Sebastian
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP2336547A1 publication Critical patent/EP2336547A1/en
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Publication of EP2336547B1 publication Critical patent/EP2336547B1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/0603—Injectors peculiar thereto with means directly operating the valve needle using piezoelectric or magnetostrictive operating means

Definitions

  • the invention relates to an injection valve for installation in a receiving shaft in the cylinder head of an internal combustion engine according to the preamble of claim 1.
  • a well-known injection valve for fuel also called injector ( DE 10 2007 028 490 A1 ), has a valve housing with a arranged at one end of the housing valve group and arranged at the other end of the housing fuel inlet.
  • the valve group comprises a valve needle, which cooperates with a valve seat surrounding a spray opening, and a valve closing spring, which presses the valve needle onto the valve seat.
  • piezoelectric actuator which is electrically connected to plug contacts of a connectable with a mating connector plug.
  • a connector housing enclosing the plug contacts of the connector plug is formed in a plastic body, which is sprayed onto the fuel inlet end of the valve housing and also encloses the fuel inlet.
  • Such a fuel injection valve is installed for direct fuel injection in a central receiving shaft in the cylinder head of the internal combustion engine, which is placed between the drives for the gas exchange valves.
  • the elastic Sealing flange which presses against the shaft wall, seals the receiving shaft against dirt and spray to prevent damage to fuel injector and engine.
  • the sealing flange is arranged on the injection valve so that it is placed after installation of the injector above the so-called. Cylinder head division at which a cylinder head cover is tightened by a seal on a cylinder head body. Coolant channels for the cylinder head extend beyond the cylinder head spacing and are composed of sub-channels formed in the base body and in the cover.
  • the injector according to the invention with the features of claim 1 has the advantage that forms from the end of the plastic body, which faces away from the fuel inlet to at least the connector housing extending smooth surface of the interface between the valve body and plastic body below the sealing flange forms a leakage path, the after installation of the injector in the receiving shaft in the cylinder head establishes a connection between the receiving shaft and the interior of the connector housing.
  • the tightness of the cylinder head more precisely, the tightness of the interface between the cylinder head body and cylinder head cover, are tested in the engine mounting on the sealing flange over the connector housing.
  • a poor seal quality of the seal between the cylinder head body and the cylinder head cover can be detected by appropriate measurement of accumulating in the connector housing test air. After attaching the mating connector to the connector housing this is protected against ingress of moisture, so that no moisture can penetrate into the shaft on the existing also during operation leak path.
  • the fuel feed continues into an inlet nozzle inserted into the valve housing and the inlet nozzle is enclosed by the plastic body over part of its axial extent.
  • a plurality of parallel annular grooves are incorporated, which are filled by the plastic material of the plastic body after its encapsulation.
  • Partial injection valve 10 shown in longitudinal section is used for the direct injection of fuel into the combustion chamber 11 of a combustion cylinder of an internal combustion engine or an internal combustion engine, which is bounded by a reciprocating piston axially displaceably guided in the combustion cylinder and a cylinder head 12.
  • the cylinder head 12 is divided into a cylinder head body 121 and a cylinder head cover 122. The latter is clamped with the interposition of a seal 13 on the cylinder head body 121.
  • each cooling oil channel 14th is composed of a formed in the cylinder head body 121 channel part and a molded into the cylinder head cover 122 channel part.
  • a receiving shaft 15 is formed for an injection valve 10.
  • the injection valve 10 has a valve housing 16 which has an injection opening 17 at one end face and a fuel inlet 18 at its other end face.
  • the valve housing 16 is composed of a housing sleeve 19 and a the fuel inlet 18 facing the end of the housing sleeve 19 occlusive connector 20 (FIGS. FIG. 2 ) together.
  • the connector 20 is partially inserted into the housing sleeve 19 and fixedly connected to this, for example via a weld 21.
  • a valve group is arranged, which comprises a partially inserted into the housing sleeve 19, the ejection opening 17 having nozzle body 22, a discharge opening 17 controlling valve needle 23 and a valve needle 23 in the valve closed position retaining return spring 24.
  • the outwardly opening valve needle 23 is actuated by means disposed in the housing sleeve 19 between the connecting piece 20 and the valve group actuator 25 against the closing force of the return spring 24.
  • the actuator 25 is formed in the embodiment as a piezoelectric actuator whose electrical connections are connected to plug contacts 26 of a connector plug 27. Piezoelectric actuators are known and, for example, in the DE 103 19 599 A1 described.
  • the fuel inlet 18 formed in the connecting piece 20 is preceded by an inlet nozzle 28, onto which a fuel feed line can be plugged.
  • the inlet nozzle 28 is inserted end into the connecting piece 20 and fixedly connected to this, for example by welding.
  • a plastic body 29 is sprayed, the end covers the housing sleeve 19 extends over the protruding from the housing sleeve 19 part of the connector 20 and the inlet nozzle 28 encloses part of its axial length.
  • a connector housing 26 surrounding the connector housing 30 is formed during spraying, which is designed for attaching a plug connector 26, not shown, mating connector, which in turn can be pushed onto the connector housing 30 and latched thereto.
  • an elastic sealing flange 31 is arranged, which serves to seal the receiving shaft 15 after installation of the injection valve 10 in the cylinder head 12, like this FIG. 1 is apparent.
  • the in FIG. 3 shown sealing flange 31 has an annular body 311 and one of which integrally projecting, circumferential sealing bead 312 with finger-like cross section.
  • an annular groove 32 is formed, in which the annular body 311 of the sealing flange 31 rests.
  • the annular body 311 can be pressed into the annular groove 32 and / or glued.
  • the sealing bead 312 presses after installation of the injection valve 10 in the receiving shaft 15 in the cylinder head 12 to the shaft wall 151 of the receiving shaft 15 and seals the receiving shaft 15 hermetically.
  • the region of the valve housing 16 extending from the extending from the fluid inlet end of the plastic body 29 extends at least to the connector housing 30, a smooth outer surface without circumferential grooves, circumferential grooves or other circumferential recesses in which plastic material can settle on.
  • This smooth outer surface causes after the plastic extrusion for the production of the plastic body 29 between the plastic body 29 and this smooth surface portion of the valve housing 16, here the surface of the end portion of the housing sleeve 19 and of this projecting portion of the fitting 20, a leakage path is present.
  • the mating connector is plugged onto the connector housing 30 and thus the connector housing 30 is sealed against the ingress of moisture and dirt, so that no moisture can penetrate into the receiving shaft 15 via the leakage path from the connector housing 30 to the receiving shaft 15.
  • the inlet nozzle 28 is provided with a plurality of parallel grooves 33 which extend over the circumference of the inlet nozzle 28 and 29 are filled with plastic material during spraying of the plastic body. This creates a kind of toothing between the plastic body 29 and the inlet nozzle 28, which reliably prevents passage of moisture.

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

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einem Einspritzventil zum Einbau in einen Aufnahmeschacht im Zylinderkopf einer Brennkraftmaschine nach dem Oberbegriff des Anspruchs 1.The invention relates to an injection valve for installation in a receiving shaft in the cylinder head of an internal combustion engine according to the preamble of claim 1.

Ein bekanntes Einspritzventil für Kraftstoff, auch Injektor genannt ( DE 10 2007 028 490 A1 ), weist ein Ventilgehäuse mit einer an dem einen Gehäuseende angeordneten Ventilgruppe und einem am anderen Gehäuseende angeordneten Kraftstoffzulauf auf. Die Ventilgruppe umfasst eine Ventilnadel, die mit einem eine Abspritzöffnung umgebenden Ventilsitz zusammenwirkt, und eine Ventilschließfeder, die die Ventilnadel auf den Ventilsitz aufpresst. Zum Öffnen des Ventils wirkt auf die Ventilnadel ein zwischen Ventilgruppe und Kraftstoffzulauf im Ventilgehäuse angeordneter, piezoelektrischer Aktor, der an Steckerkontakten eines mit einem Gegenstecker verbindbaren Anschlusssteckers elektrisch angeschlossen ist. Ein die Steckerkontakte umschließendes Steckergehäuse des Anschlusssteckers ist in einen Kunststoffkörper eingeformt, der auf das kraftstoffzulaufseitige Ende des Ventilgehäuses aufgespritzt ist und auch den Kraftstoffzulauf umschließt. Auf der vom Kraftstoffzulauf abgekehrten Seite des Steckergehäuses ist in den Kunststoffkörper eine Ringnut eingearbeitet, in die ein elastischer Dichtungsflansch eingesetzt ist. Unterhalb des Dichtungsflansches sind in der Außenfläche des Ventilgehäuses parallel zueinander verlaufende Ringnuten eingefräst, die beim Spritzen des Kunststoffkörpers mit Kunststoffmaterial aufgefüllt werden, so dass sich Kunststoffkörper und Ventilgehäuse miteinander "verzahnen". Diese Verzahnung verhindert ein Eindringen von Feuchtigkeit über die Schnittstelle von Ventilgehäuse und Kunststoffkörper.A well-known injection valve for fuel, also called injector ( DE 10 2007 028 490 A1 ), has a valve housing with a arranged at one end of the housing valve group and arranged at the other end of the housing fuel inlet. The valve group comprises a valve needle, which cooperates with a valve seat surrounding a spray opening, and a valve closing spring, which presses the valve needle onto the valve seat. To open the valve acts on the valve needle between a valve group and fuel inlet in the valve housing arranged, piezoelectric actuator which is electrically connected to plug contacts of a connectable with a mating connector plug. A connector housing enclosing the plug contacts of the connector plug is formed in a plastic body, which is sprayed onto the fuel inlet end of the valve housing and also encloses the fuel inlet. On the side facing away from the fuel inlet side of the connector housing an annular groove is incorporated in the plastic body into which an elastic sealing flange is inserted. Below the sealing flange parallel annular grooves are milled in the outer surface of the valve housing, which are filled with plastic material during injection of the plastic body, so that plastic body and valve housing "intermesh" with each other. This toothing prevents ingress of moisture via the interface of valve housing and plastic body.

Ein solches Kraftstoffeinspritzventil wird für die Kraftstoffdirekteinspritzung in einen zentralen Aufnahmeschacht im Zylinderkopf der Brennkraftmaschine eingebaut, der zwischen den Antrieben für die Gaswechselventile platziert ist. Der elastische Dichtungsflansch, der sich gegen die Schachtwand anpresst, dichtet den Aufnahmeschacht gegen Schmutz und Spritzwasser ab, um Schädigungen an Kraftstoffeinspritzventil und Brennkraftmaschine zu vermeiden. Aus bautechnischen Gründen ist der Dichtungsflansch am Einspritzventil so angeordnet, dass er nach Einbau des Einspritzventils oberhalb der sog. Zylinderkopfteilung platziert ist, an der ein Zylinderkopf-Deckel über eine Dichtung auf einen Zylinderkopf-Grundkörper festgespannt ist. Kühlölkanäle für den Zylinderkopf erstrecken sich über die Zylinderkopfteilung hinweg und sind aus im Grundkörper und im Deckel ausgeformten Teilkanälen zusammengesetzt. Da nach Montage des Einspritzventils der Dichtungsflansch den Aufnahmeschacht abdeckt, können nach Einbau des Kraftstoffeinspritzventils Undichtigkeiten in der Zylinderkopfteilung nicht mehr über den Aufnahmeschacht im Zylinderkopf festgestellt werden und somit die Dichtheit der Zylinderkopfteilung nicht während der Motormontage geprüft werden.Such a fuel injection valve is installed for direct fuel injection in a central receiving shaft in the cylinder head of the internal combustion engine, which is placed between the drives for the gas exchange valves. The elastic Sealing flange, which presses against the shaft wall, seals the receiving shaft against dirt and spray to prevent damage to fuel injector and engine. For structural reasons, the sealing flange is arranged on the injection valve so that it is placed after installation of the injector above the so-called. Cylinder head division at which a cylinder head cover is tightened by a seal on a cylinder head body. Coolant channels for the cylinder head extend beyond the cylinder head spacing and are composed of sub-channels formed in the base body and in the cover. Since, after installation of the injection valve, the sealing flange covers the receiving shaft, leaks in the cylinder head division can no longer be detected via the receiving shaft in the cylinder head after installation of the fuel injection valve and thus the tightness of the cylinder head division can not be checked during engine assembly.

Offenbarung der ErfindungDisclosure of the invention Vorteile der ErfindungAdvantages of the invention

Das erfindungsgemäße Einspritzventil mit den Merkmalen des Anspruchs 1 hat den Vorteil, dass durch die sich vom Ende des Kunststoffkörpers, das vom Kraftstoffzulauf abgekehrt ist, bis mindestens hin zum Steckergehäuse erstreckende Glattflächigkeit der Schnittstelle zwischen Ventilgehäuse und Kunststoffkörper sich unterhalb des Dichtungsflansches ein Undichtigkeitspfad bildet, der nach Einbau des Einspritzventils in den Aufnahmeschacht im Zylinderkopf eine Verbindung zwischen dem Aufnahmeschacht und dem Innern des Steckergehäuses herstellt. Damit kann trotz hermetischer Abdeckung des Aufnahmeschachts durch den elastischen Dichtungsflansch die Dichtheit des Zylinderkopfs, genauer gesagt die Dichtheit der Schnittstelle zwischen Zylinderkopf-Körper und Zylinderkopf-Deckel, in der Motormontage an dem Dichtungsflansch vorbei über das Steckergehäuse geprüft werden. Eine schlechte Dichtungsqualität der Dichtung zwischen Zylinderkopf-Körper und Zylinderkopf-Deckel kann durch entsprechende Messung von im Steckergehäuse anfallender Prüfluft erfasst werden. Nach Aufstecken des Gegensteckers auf das Steckergehäuses ist dieses gegen Eindringen von Feuchtigkeit geschützt, so dass über den auch während des Betriebs vorhandenen Undichtigkeitspfad keine Feuchtigkeit in den Schacht eindringen kann.The injector according to the invention with the features of claim 1 has the advantage that forms from the end of the plastic body, which faces away from the fuel inlet to at least the connector housing extending smooth surface of the interface between the valve body and plastic body below the sealing flange forms a leakage path, the after installation of the injector in the receiving shaft in the cylinder head establishes a connection between the receiving shaft and the interior of the connector housing. Thus, despite hermetic coverage of the receiving shaft through the elastic sealing flange, the tightness of the cylinder head, more precisely, the tightness of the interface between the cylinder head body and cylinder head cover, are tested in the engine mounting on the sealing flange over the connector housing. A poor seal quality of the seal between the cylinder head body and the cylinder head cover can be detected by appropriate measurement of accumulating in the connector housing test air. After attaching the mating connector to the connector housing this is protected against ingress of moisture, so that no moisture can penetrate into the shaft on the existing also during operation leak path.

Durch die in den weiteren Ansprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen des im Anspruch 1 angegebenen Einspritzventils möglich.The measures listed in the further claims advantageous refinements and improvements of the claim 1 injection valve are possible.

Gemäß einer vorteilhaften Ausführungsform der Erfindung setzt sich der Kraftstoffzulauf in einen in das Ventilgehäuse eingesetzten Zulaufstutzen fort und ist der Zulaufstutzen über einen Teil seiner Axialerstreckung vom Kunststoffkörper umschlossen. In den Anschlussstutzen sind mehrere parallele Ringnuten eingearbeitet, die von dem Kunststoffmaterial des Kunststoffkörpers nach dessen Umspritzen ausgefüllt sind. Durch die dadurch erfolgende "Verzahnung" von Kunststoffkörper und Zulaufstutzen auf der von dem Dichtungsflansch abgekehrten Seite des Steckergehäuses wird das Eindringen von Feuchtigkeit über die Schnittstelle zwischen Ventilgehäuse und Kunststoffkörper verhindert.According to an advantageous embodiment of the invention, the fuel feed continues into an inlet nozzle inserted into the valve housing and the inlet nozzle is enclosed by the plastic body over part of its axial extent. In the connection piece, a plurality of parallel annular grooves are incorporated, which are filled by the plastic material of the plastic body after its encapsulation. By thus taking place "toothing" of the plastic body and inlet nozzle on the side facing away from the sealing flange side of the connector housing the ingress of moisture through the interface between the valve body and plastic body is prevented.

Kurze Beschreibung der ZeichnungenBrief description of the drawings

Die Erfindung ist anhand eines in den Zeichnungen dargestellten Ausführungsbeispiels in der nachfolgenden Beschreibung näher erläutert. Es zeigen:

  • Figur 1 eine Seitenansicht eines Einspritzventils, teilweise aufgeschnitten, in Einbaulage in einem Zylinderkopf einer Brennkraftmaschine,
  • Figur 2 einen Längsschnitt des Ausschnitts II des Einspritzventils in Figur 1,
  • Figur 3 eine vergrößerte Darstellung des Ausschnitts III in Figur 2.
The invention is explained in more detail in the following description with reference to an embodiment shown in the drawings. Show it:
  • FIG. 1 a side view of an injection valve, partially cut away, in installed position in a cylinder head of an internal combustion engine,
  • FIG. 2 a longitudinal section of the section II of the injection valve in FIG. 1 .
  • FIG. 3 an enlarged view of the section III in FIG. 2 ,

Ausführungsformen der ErfindungEmbodiments of the invention

Das in Figur 1 in Seitenansicht, teilweise geschnitten, und in Figur 2 ausschnittweise im Längsschnitt dargestellte Einspritzventil 10 dient der Direkteinspritzung von Kraftstoff in den Brennraum 11 eines Verbrennungszylinders eines Verbrennungsmotors oder einer Brennkraftmaschine, der von einem im Verbrennungszylinder axial verschieblich geführten Hubkolben und einem Zylinderkopf 12 begrenzt ist. Der Zylinderkopf 12 ist in einen Zylinderkopf-Grundkörper 121 und einen Zylinderkopf-Deckel 122 unterteilt. Letzterer ist unter Zwischenlage einer Dichtung 13 auf dem Zylinderkopf-Grundkörper 121 festgespannt. Im Zylinderkopf 12 verlaufen Kühlölkanäle 14, wobei jeder Kühlölkanal 14 aus einem im Zylinderkopf-Körper 121 eingeformten Kanalteil und einem in den Zylinderkopf-Deckel 122 eingeformten Kanalteil zusammengesetzt ist. Vorzugsweise zentral im Zylinderkopf 12 ist ein Aufnahmeschacht 15 für ein Einspritzventil 10 ausgebildet.This in FIG. 1 in side view, partially cut, and in FIG. 2 Partial injection valve 10 shown in longitudinal section is used for the direct injection of fuel into the combustion chamber 11 of a combustion cylinder of an internal combustion engine or an internal combustion engine, which is bounded by a reciprocating piston axially displaceably guided in the combustion cylinder and a cylinder head 12. The cylinder head 12 is divided into a cylinder head body 121 and a cylinder head cover 122. The latter is clamped with the interposition of a seal 13 on the cylinder head body 121. In the cylinder head 12 extend cooling oil channels 14, each cooling oil channel 14th is composed of a formed in the cylinder head body 121 channel part and a molded into the cylinder head cover 122 channel part. Preferably, centrally in the cylinder head 12, a receiving shaft 15 is formed for an injection valve 10.

Das Einspritzventil 10 weist ein Ventilgehäuse 16 auf, das an einem Stirnende eine Einspritzöffnung 17 und an seinem anderen Stirnende einen Kraftstoffzulauf 18 aufweist. Das Ventilgehäuse 16 setzt sich aus einer Gehäusehülse 19 und einem das den Kraftstoffzulauf 18 zugekehrte Ende der Gehäusehülse 19 verschließenden Anschlussstück 20 (Figur 2) zusammen. Das Anschlussstück 20 ist teilweise in die Gehäusehülse 19 eingesteckt und mit dieser z.B. über eine Schweißnaht 21 fest verbunden. Am anderen Stirnende des Ventilgehäuses 16 ist eine Ventilgruppe angeordnet, die einen in die Gehäusehülse 19 teilweise eingesetzten, die Abspritzöffnung 17 aufweisenden Düsenkörper 22, eine die Abspritzöffnung 17 steuernde Ventilnadel 23 und eine die Ventilnadel 23 in Ventilschließstellung haltende Rückstellfeder 24 umfasst. Die nach außen öffnende Ventilnadel 23 wird mittels eines in der Gehäusehülse 19 zwischen dem Anschlussstück 20 und der Ventilgruppe angeordneten Aktors 25 gegen die Schließkraft der Rückstellfeder 24 betätigt. Der Aktor 25 ist im Ausführungsbeispiel als piezoelektrischer Aktor ausgebildet, dessen elektrische Anschlüsse mit Steckerkontakten 26 eines Anschlusssteckers 27 verbunden sind. Piezoelektrische Aktoren sind bekannt und beispielsweise in der DE 103 19 599 A1 beschrieben. Dem im Anschlussstutzen 20 ausgebildeten Kraftstoffzulauf 18 ist ein Zulaufstutzen 28 vorgesetzt, auf den eine Kraftstoffzulaufleitung aufgesteckt werden kann. Der Zulaufstutzen 28 ist endseitig in das Anschlussstück 20 eingesetzt und mit diesem, z.B. durch Schweißen, fest verbunden. Auf das kraftstoffzulaufseitige Stirnende des Ventilgehäuses 16 ist ein Kunststoffkörper 29 aufgespritzt, der endseitig die Gehäusehülse 19 überdeckt, sich über den aus der Gehäusehülse 19 vorstehenden Teil des Anschlussstücks 20 erstreckt und den Zulaufstutzen 28 über einen Teil von dessen axialer Länge umschließt. Am Kunststoffkörper 29 ist beim Spritzen ein die Steckerkontakte 26 umgebendes Steckergehäuse 30 angeformt, das zum Aufstecken eines hier nicht dargestellten, die Steckerkontakte 26 kontaktierenden Gegensteckers ausgebildet ist, der seinerseits auf das Steckergehäuse 30 aufschiebbar und auf diesem verrastbar ist.The injection valve 10 has a valve housing 16 which has an injection opening 17 at one end face and a fuel inlet 18 at its other end face. The valve housing 16 is composed of a housing sleeve 19 and a the fuel inlet 18 facing the end of the housing sleeve 19 occlusive connector 20 (FIGS. FIG. 2 ) together. The connector 20 is partially inserted into the housing sleeve 19 and fixedly connected to this, for example via a weld 21. At the other end face of the valve housing 16, a valve group is arranged, which comprises a partially inserted into the housing sleeve 19, the ejection opening 17 having nozzle body 22, a discharge opening 17 controlling valve needle 23 and a valve needle 23 in the valve closed position retaining return spring 24. The outwardly opening valve needle 23 is actuated by means disposed in the housing sleeve 19 between the connecting piece 20 and the valve group actuator 25 against the closing force of the return spring 24. The actuator 25 is formed in the embodiment as a piezoelectric actuator whose electrical connections are connected to plug contacts 26 of a connector plug 27. Piezoelectric actuators are known and, for example, in the DE 103 19 599 A1 described. The fuel inlet 18 formed in the connecting piece 20 is preceded by an inlet nozzle 28, onto which a fuel feed line can be plugged. The inlet nozzle 28 is inserted end into the connecting piece 20 and fixedly connected to this, for example by welding. On the fuel inlet-side end face of the valve housing 16, a plastic body 29 is sprayed, the end covers the housing sleeve 19 extends over the protruding from the housing sleeve 19 part of the connector 20 and the inlet nozzle 28 encloses part of its axial length. On the plastic body 29, a connector housing 26 surrounding the connector housing 30 is formed during spraying, which is designed for attaching a plug connector 26, not shown, mating connector, which in turn can be pushed onto the connector housing 30 and latched thereto.

Auf dem Kunststoffkörper 29, und zwar an dessen vom Kraftstoffzulauf 18 abgekehrten Körperende, ist ein elastischer Dichtungsflansch 31 angeordnet, der zur Abdichtung des Aufnahmeschachts 15 nach Einbau des Einspritzventils 10 in den Zylinderkopf 12 dient, wie dies aus Figur 1 ersichtlich ist. Der in Figur 3 vergrößert dargestellte Dichtungsflansch 31 weist einen Ringkörper 311 und einen davon einstückig abstehenden, umlaufenden Dichtungswulst 312 mit fingerartigem Querschnitt auf. Im Kunststoffkörper 29 ist eine Ringnut 32 eingeformt, in der der Ringkörper 311 des Dichtungsflansches 31 einliegt. Der Ringkörper 311 kann dabei in die Ringnut 32 eingepresst und/oder eingeklebt sein. Der Dichtungswulst 312 presst sich nach Einbau des Einspritzventils 10 in den Aufnahmeschacht 15 im Zylinderkopf 12 an die Schachtwand 151 des Aufnahmeschachts 15 an und dichtet den Aufnahmeschacht 15 hermetisch ab.On the plastic body 29, namely at its side facing away from the fuel inlet 18 body end, an elastic sealing flange 31 is arranged, which serves to seal the receiving shaft 15 after installation of the injection valve 10 in the cylinder head 12, like this FIG. 1 is apparent. The in FIG. 3 shown sealing flange 31 has an annular body 311 and one of which integrally projecting, circumferential sealing bead 312 with finger-like cross section. In the plastic body 29, an annular groove 32 is formed, in which the annular body 311 of the sealing flange 31 rests. The annular body 311 can be pressed into the annular groove 32 and / or glued. The sealing bead 312 presses after installation of the injection valve 10 in the receiving shaft 15 in the cylinder head 12 to the shaft wall 151 of the receiving shaft 15 and seals the receiving shaft 15 hermetically.

Um bei der Motormontage nach Einbau des Einspritzventils 10 in den Zylinderkopf 12 die Dichtheit der Zylinderkopfteilung, also die Dichtungsqualität der Dichtung 13 zwischen Zylinderkopf-Körper 121 und Zylinderkopf-Deckel 122, prüfen zu können, weist der Bereich des Ventilgehäuses 16, der sich von dem vom Fluidzulauf abgekehrten Ende des Kunststoffkörpers 29 bis mindestens zum Steckergehäuse 30 erstreckt, eine glatte Außenfläche ohne umlaufende Rillen, Umfangsnuten oder sonstige umlaufende Vertiefungen, in denen sich Kunststoffmaterial festsetzen kann, auf. Diese glatte Außenfläche bewirkt, dass nach der Kunststoffumspritzung zur Herstellung des Kunststoffkörpers 29 zwischen dem Kunststoffkörper 29 und diesem glatten Oberflächenbereich des Ventilgehäuses 16, hier also der Oberfläche des Endabschnitts der Gehäusehülse 19 und des aus dieser vorstehenden Teils des Anschlussstücks 20, ein Undichtigkeitspfad vorhanden ist. Über diesen Undichtigkeitspfad und über die Undichtigkeit zwischen dem Kunststoffkörper 29 und den in diesem teilweise verlaufenden Steckerkontakten 26 ist somit eine den Dichtungsflansch 31 umgehende Verbindung zwischen Aufnahmeschacht 15 und dem Innern des Steckergehäuses 30 hergestellt. Werden zur Dichtheitsprüfung der Zylinderkopfteilung die Kühlölkanäle 14 mit Druckluft beaufschlagt, so würde bei Undichtigkeit der Dichtring 13 Druckluft über den Undichtigkeitspfad in das Steckergehäuse 30 gelangen und dort gemessen werden können.In order to check the tightness of the cylinder head pitch, so the seal quality of the seal 13 between the cylinder head body 121 and cylinder head cover 122 in the engine mounting after the injection valve 10 in the cylinder head 12, the region of the valve housing 16 extending from the extending from the fluid inlet end of the plastic body 29 extends at least to the connector housing 30, a smooth outer surface without circumferential grooves, circumferential grooves or other circumferential recesses in which plastic material can settle on. This smooth outer surface causes after the plastic extrusion for the production of the plastic body 29 between the plastic body 29 and this smooth surface portion of the valve housing 16, here the surface of the end portion of the housing sleeve 19 and of this projecting portion of the fitting 20, a leakage path is present. About this leaking path and the leak between the plastic body 29 and in this partially extending plug contacts 26 thus the sealing flange 31 immediate connection between receiving shaft 15 and the interior of the plug housing 30 is made. If the cooling oil channels 14 are acted upon with compressed air for leak testing of the cylinder head pitch, then in the event of leakage of the sealing ring 13, compressed air would reach the connector housing 30 via the leak path and be measured there.

Im Betrieb der Brennkraftmaschine ist der Gegenstecker auf das Steckergehäuse 30 aufgesteckt und somit das Steckergehäuse 30 gegen Eindringen von Feuchtigkeit und Schmutz abgedichtet, so dass auch über den Undichtigkeitspfad vom Steckergehäuse 30 zum Aufnahmeschacht 15 keine Feuchtigkeit in den Aufnahmeschacht 15 eindringen kann.During operation of the internal combustion engine, the mating connector is plugged onto the connector housing 30 and thus the connector housing 30 is sealed against the ingress of moisture and dirt, so that no moisture can penetrate into the receiving shaft 15 via the leakage path from the connector housing 30 to the receiving shaft 15.

Um auch das Eindringen von Feuchtigkeit über die Schnittstelle zwischen Zulaufstutzen 28 und Kunststoffkörper 29 zu verhindern, ist der Zulaufstutzen 28 mit mehreren parallelen Rillen 33 versehen, die sich über den Umfang des Zulaufstutzens 28 erstrecken und beim Spritzen des Kunststoffkörpers 29 mit Kunststoffmaterial ausgefüllt werden. Dadurch entsteht eine Art Verzahnung zwischen dem Kunststoffkörper 29 und dem Zulaufstutzen 28, die ein Hindurchtreten von Feuchtigkeit zuverlässig unterbindet.In order to prevent the ingress of moisture through the interface between inlet nozzle 28 and plastic body 29, the inlet nozzle 28 is provided with a plurality of parallel grooves 33 which extend over the circumference of the inlet nozzle 28 and 29 are filled with plastic material during spraying of the plastic body. This creates a kind of toothing between the plastic body 29 and the inlet nozzle 28, which reliably prevents passage of moisture.

Claims (4)

  1. Injection valve for installation in a reception well (15) in the cylinder head (12) of an internal combustion engine, with a valve housing (16) which has an injection orifice (17) at one end face and a fuel inflow (18) at the other end face, with a plastic body (29) which is injection-moulded onto the valve housing (16) at the fuel inflow-side end face and on which is integrally formed a plug housing (30), surrounding plug contacts (26) led into the valve housing (16), for reception of a mating plug, and with an annular elastic sealing flange (31) which is seated on the plastic body (29) and which is arranged on that side of the plug housing (30) facing away from the fuel inflow (18) and, after installation in the reception well (15), seals off the latter, characterized in that at least that region of the valve housing (16) which is covered by the plastic body (29) has a smooth outer face between that end of the plastic body (29) facing away from the fuel inflow (18) and the plug housing (30), so that, between the plastic body (29) and the smooth outer face of the valve housing (16), there is a leakage path, so that a connection bypassing the sealing flange (31) is made between the reception well (15) and the interior of the plug housing (30) via the said leakage path and via a leak between the plastic body (29) and the plug contacts (26) partially running in the latter.
  2. Injection valve according to Claim 1, characterized in that the sealing flange (31) has an annular body (311) and a continuous sealing bead (312) projecting in one piece from the latter and having a finger-like cross section, and in that the annular body (311) is received in an annular groove (32) integrally formed in the plastic body (29).
  3. Injection valve according to Claim 2, characterized in that the annular body (311) is pressed and/or glued into the annular groove (32).
  4. Injection valve according to one of Claims 1 to 3, characterized in that the fuel inflow (18) is continued into an inflow connection piece (28) which is inserted into the valve housing (16) and which is surrounded over part of its axial length by the plastic body (29), and in that a plurality of channels (33) extending over the connection-piece circumference are incorporated on the outer face of the inflow connection piece (28) and are filled by the plastic material of the plastic body (29).
EP20100189171 2009-12-21 2010-10-28 Injection valve with device for testing of the cylinder head gasket Not-in-force EP2336547B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200910055087 DE102009055087A1 (en) 2009-12-21 2009-12-21 Injector

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EP2336547A1 EP2336547A1 (en) 2011-06-22
EP2336547B1 true EP2336547B1 (en) 2013-03-06

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Application Number Title Priority Date Filing Date
EP20100189171 Not-in-force EP2336547B1 (en) 2009-12-21 2010-10-28 Injection valve with device for testing of the cylinder head gasket

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EP (1) EP2336547B1 (en)
CN (2) CN104018970A (en)
DE (1) DE102009055087A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011087702A1 (en) 2011-12-05 2013-06-06 Robert Bosch Gmbh Fuel injector of common rail injection system for injecting fuel into combustion engine, has housing portion that is provided with cooling fins and cooling passages to form surface structure for passive refrigeration
DE102012204302A1 (en) * 2012-03-19 2013-09-19 Robert Bosch Gmbh Overmolded component with a sealing labyrinth
DE102013205309A1 (en) 2013-03-26 2014-10-02 Robert Bosch Gmbh Device for metering fluid

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5372313A (en) * 1993-02-16 1994-12-13 Siemens Automotive L.P. Fuel injector
DE19624611A1 (en) * 1996-06-20 1998-01-02 Freudenberg Carl Fa Device for sealing an annular gap between a housing and a shaft
DE10319599A1 (en) 2003-05-02 2004-11-18 Robert Bosch Gmbh Actuator unit for a piezo controlled fuel injection valve for a combustion engine, has a hollow body with a channel defined by edges in form fitting connection with each other
DE10345965A1 (en) * 2003-10-02 2005-07-07 Parker Hannifin Gmbh Fuel injector
JP2006057620A (en) * 2004-07-20 2006-03-02 Aisan Ind Co Ltd Fuel injection valve and method for sealing fuel injection valve
DE102004058803A1 (en) * 2004-12-07 2006-06-08 Robert Bosch Gmbh Injector
DE102007028490A1 (en) 2007-06-21 2008-12-24 Robert Bosch Gmbh Hydraulic coupler for injector, has coupler element which is connected with stationary component, where another coupler element is provided

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Publication number Publication date
CN104018970A (en) 2014-09-03
EP2336547A1 (en) 2011-06-22
DE102009055087A1 (en) 2011-06-22
CN102102613A (en) 2011-06-22

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