EP1463886B1 - Fuel injection valve - Google Patents

Fuel injection valve Download PDF

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Publication number
EP1463886B1
EP1463886B1 EP02792620A EP02792620A EP1463886B1 EP 1463886 B1 EP1463886 B1 EP 1463886B1 EP 02792620 A EP02792620 A EP 02792620A EP 02792620 A EP02792620 A EP 02792620A EP 1463886 B1 EP1463886 B1 EP 1463886B1
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EP
European Patent Office
Prior art keywords
fuel injection
coating
injection valve
sealing ring
injection system
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.)
Expired - Lifetime
Application number
EP02792620A
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German (de)
French (fr)
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EP1463886A1 (en
Inventor
Werner Berger
Martin Buehner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
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Robert Bosch GmbH
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Publication date
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Publication of EP1463886A1 publication Critical patent/EP1463886A1/en
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Publication of EP1463886B1 publication Critical patent/EP1463886B1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
    • F02M51/0625—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
    • F02M51/0635—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding
    • F02M51/0642—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding the armature having a valve attached thereto
    • F02M51/0653—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding the armature having a valve attached thereto the valve being an elongated body, e.g. a needle valve
    • 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
    • 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 injection valve according to the preamble of claim 1.
  • an electromagnetic fuel injection valve and a fastening structure suitable therefor are known with which the requirements for the sealing effect, the thermal resistance and the pressure resistance are fulfilled for an internal combustion engine having a cylinder injection system. Particular care is taken in the sealing of the area in the immediate vicinity of the cylinder, in which the electromagnetic fuel injection valve is mounted, as well as on an area further away.
  • a first sealing portion with a first sealing ring which is designed as a corrugated washer, is located at a location close to the cylinder and between the fuel injection valve and the cylinder head.
  • a second sealing portion with a second sealing ring which is also designed as a corrugated washer, positioned at a location which is farther from the cylinder than the first sealing portion.
  • a disadvantage of the from the DE 196 00 403 A1 known fuel injection valve is in particular the high coking tendency of the formed between the fuel injection valve and the wall of the cylinder head gap downstream of the sealing ring, resulting in a considerable force and possible damage during disassembly of the fuel injection valve from the cylinder head.
  • nozzle body having a surface which faces the combustion chamber and is provided with an adhesion-reducing coating to prevent fuel deposits known.
  • the coating is applied only on the tip of the nozzle body.
  • the fuel injection valve according to the invention with the characterizing features of claim 1 has the advantage that a patch on the tip of the fuel injection valve and the annular gap between the fuel injection valve and the cylinder wall filling coating prevents the penetration and subsequent burning of fuel in the annular gap. As a result, on the one hand, the deposition of coking residues in the annular gap can be avoided and, on the other hand, the thermal load of the sealing ring can be reduced.
  • the coating can be solid or pasty or liquid, depending on the requirements placed on it.
  • the coating fills the entire downstream part of the annular gap, so that any penetration of mixture is prevented.
  • Teflon ® layer may be carried out, which may be integrally formed with the also made of Teflon ® seal.
  • a fuel injection valve 1 is in the form of a fuel injection valve for fuel injection systems of mixture-compression spark-ignition internal combustion engines.
  • the fuel injection valve 1 is suitable for the direct injection of fuel into a combustion chamber 18 of an internal combustion engine.
  • the fuel injection valve 1 comprises a nozzle body 2 and a valve housing 3. On the inflow side, an inlet nozzle 4 is formed, in which an intermediate sleeve 5 is arranged for connection of the fuel injection valve 1 with a fuel distributor line 6.
  • Support members 9 and 10 ensure a correct mounting position of the above components to each other.
  • the fuel injection valve 1 is inserted into a cylinder head 11 of the internal combustion engine and is fixed there by means of a hold-down only 12, which may be formed, for example, as a clamping claw or spring sleeve, fixed and secured against rotation.
  • annular gap 14 is formed, which must have a certain width, so on the one hand, the fuel injector 1 without too much effort, which u. U. could lead to damage to the fuel injection valve 1, is mountable, and on the other hand, a thermal expansion of the components in the heating by the operation of the internal combustion engine allowed.
  • a sealing ring 15 is provided, which is arranged in a recess 16 of the nozzle body 2 of the fuel injection valve 1.
  • the sealing ring 15 is preferably made of Teflon® in order to achieve a reliable sealing effect with high stability.
  • Outflow side of the sealing ring 15 of the annular gap 14 is inventively filled by a coating 17, which prevents the fuel-air mixture penetrates into the annular gap 14 and burns after ignition of the mixture in the combustion chamber 18 mixture cloud under deposition of coking residues.
  • a coating 17 which prevents the fuel-air mixture penetrates into the annular gap 14 and burns after ignition of the mixture in the combustion chamber 18 mixture cloud under deposition of coking residues.
  • the entire room must not be filled, as otherwise installation tolerances can not be compensated (eg tilting of the injection valve).
  • the coating 17 reduces too high a thermal load on the sealing ring 15, which occurs when the internal combustion engine is put into operation.
  • the coating 17 must therefore preferably be temperature-resistant up to 200 ° C. and be resistant to the combustion chamber atmosphere, so that a possible contact between the mixtures present in the combustion chamber 18 and the material of the coating 17 does not have a destructive effect.
  • the coating 17 can either be applied to the nozzle body 2 of the fuel injection valve 1 before assembly, or else it is introduced into the annular gap 14 after installation of the fuel injection valve 1.
  • the coating 17 may thus be either solid or pasty and brushable or liquid. It can for example be injected from a tube or a similar device in the annular gap 14.
  • the coating may consist of a thin Teflon® layer.
  • Teflon® layer may consist of Teflon® layer.
  • Teflon ® sealing ring 15 it is also conceivable to form these integrally with the likewise made of Teflon ® sealing ring 15.
  • the coating 17 is attached to the downstream end of the nozzle body 2 of the fuel injection valve 1 so that it occupies the outflow side of the sealing ring 15 extending part of the annular gap 14 completely on the entire axial length between the sealing ring 15 and the combustion chamber 18. As a result, any penetration of mixture into the annular gap 14 is prevented.
  • the invention is not limited to the illustrated embodiment and for any construction of fuel injectors 1, for example, for fuel injectors 1 with connection to a common rail system, applicable.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einem Brennstoffeinspritzventil nach der Gattung des Anspruchs 1.The invention relates to a fuel injection valve according to the preamble of claim 1.

Aus der DE 196 00 403 A1 ist beispielsweise ein elektromagnetisches Brennstoffeinspritzventil und eine dafür geeignete Befestigungsstruktur bekannt, mit denen für eine Brennkraftmaschine mit einem Zylinder-Einspritzsystem die Anforderungen an die Abdichtwirkung, die thermische Resistenz und die Druckresistenz erfüllt werden. Besondere Sorgfalt wird dabei auf die Abdichtung des Bereichs in unmittelbarer Nachbarschaft zum Zylinder gerichtet, in dem das elektromagnetische Brennstoffeinspritzventil befestigt ist, wie auch auf einen davon weiter entfernten Bereich. Daraus resultiert, daß erfindungsgemäß ein erster Dichtabschnitt mit einem ersten Dichtungsring, der als gewellter Unterlegring ausgeführt ist, an einer Stelle nahe am Zylinder und zwischen dem Brennstoffeinspritzventil und dem Zylinderkopf liegt. Ferner ist ein zweiter Dichtabschnitt mit einem zweiten Dichtungsring, der ebenfalls als gewellter Unterlegring ausgeführt ist, an einer Stelle positioniert, die weiter vom Zylinder entfernt ist als der erste Dichtabschnitt.From the DE 196 00 403 A1 For example, an electromagnetic fuel injection valve and a fastening structure suitable therefor are known with which the requirements for the sealing effect, the thermal resistance and the pressure resistance are fulfilled for an internal combustion engine having a cylinder injection system. Particular care is taken in the sealing of the area in the immediate vicinity of the cylinder, in which the electromagnetic fuel injection valve is mounted, as well as on an area further away. As a result, according to the invention, a first sealing portion with a first sealing ring, which is designed as a corrugated washer, is located at a location close to the cylinder and between the fuel injection valve and the cylinder head. Further, a second sealing portion with a second sealing ring, which is also designed as a corrugated washer, positioned at a location which is farther from the cylinder than the first sealing portion.

Nachteilig an dem aus der DE 196 00 403 A1 bekannten Brennstoffeinspritzventil ist insbesondere die hohe Verkokungsneigung des zwischen dem Brennstoffeinspritzventil und der Wandung des Zylinderkopfes ausgebildeten Spalts abströmseitig des Dichtrings, was zu einem erheblichen Kraftaufwand und möglichen Beschädigungen bei der Demontage des Brennstoffeinspritzventils aus dem Zylinderkopf führt.A disadvantage of the from the DE 196 00 403 A1 known fuel injection valve is in particular the high coking tendency of the formed between the fuel injection valve and the wall of the cylinder head gap downstream of the sealing ring, resulting in a considerable force and possible damage during disassembly of the fuel injection valve from the cylinder head.

Andererseits ist die thermische Belastung auf den Dichtring über den Ringspalt bei Inbetriebnahme der Brennkraftmaschine erheblich und kann zur Zerstörung des Dichtrings und nachfolgenden Fehlfunktionen führen.On the other hand, the thermal load on the sealing ring over the annular gap during commissioning of the internal combustion engine is considerable and can lead to the destruction of the sealing ring and subsequent malfunction.

Aus der JP09112392 ist ein Düsenkörper mit einer Oberfläche, die dem Brennraum zugewandet ist und mit einer haftvermindernden Beschichtung zur Vermeidung vom Kraftstoffablagerungen versehen ist, bekannt. Die Beschichtung ist nur auf der Spitze des Düsenkörpers aufgebracht.From the JP09112392 is a nozzle body having a surface which faces the combustion chamber and is provided with an adhesion-reducing coating to prevent fuel deposits known. The coating is applied only on the tip of the nozzle body.

Vorteile der ErfindungAdvantages of the invention

Das erfindungsgemäße Brennstoffeinspritzventil mit den kennzeichnenden Merkmalen des Anspruchs 1 hat demgegenüber den Vorteil, daß eine auf die Spitze des Brennstoffeinspritzventils aufgesetzte und den Ringspalt zwischen dem Brennstoffeinspritzventil und der Zylinderwandung ausfüllende Beschichtung das Eindringen und nachfolgende Abbrennen von Brennstoff in dem Ringspalt verhindert. Dadurch kann einerseits die Ablagerung von Verkokungsrückständen in dem Ringspalt vermieden und andererseits die thermische Belastung des Dichtrings reduziert werden.The fuel injection valve according to the invention with the characterizing features of claim 1 has the advantage that a patch on the tip of the fuel injection valve and the annular gap between the fuel injection valve and the cylinder wall filling coating prevents the penetration and subsequent burning of fuel in the annular gap. As a result, on the one hand, the deposition of coking residues in the annular gap can be avoided and, on the other hand, the thermal load of the sealing ring can be reduced.

Durch die in den abhängigen Ansprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen des im Hauptanspruch angegebenen Brennstoffeinspritzventils möglich.The measures listed in the dependent claims advantageous developments of the fuel injection valve specified in the main claim are possible.

Von Vorteil ist insbesondere, daß die Beschichtung je nach den an sie gestellten Anforderungen fest oder auch pastenartig oder flüssig sein kann.It is particularly advantageous that the coating can be solid or pasty or liquid, depending on the requirements placed on it.

Bei festen Beschichtungen darf nicht der gesamte Raum ausgefüllt werden, da sonst Einbautoleranzen nicht ausgleichbar sind (z. B. Kippen des Einspritzventiles).For solid coatings, the entire room must not be filled, as otherwise installation tolerances can not be compensated (eg tilting of the injection valve).

Vorteilhafterweise füllt die Beschichtung den gesamten abströmseitigen Teil des Ringspalts aus, so daß jegliches Eindringen von Gemisch unterbunden wird.Advantageously, the coating fills the entire downstream part of the annular gap, so that any penetration of mixture is prevented.

Von Vorteil ist weiterhin, daß die Beschichtung in Form einer dünnen Teflon®-Schicht ausgeführt sein kann, welche einstückig mit dem ebenfalls aus Teflon® bestehenden Dichtring ausgebildet sein kann.Another advantage is that the coating in the form of a thin Teflon ® layer may be carried out, which may be integrally formed with the also made of Teflon ® seal.

Zeichnungdrawing

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung vereinfacht dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen:

Fig. 1
einen schematischen Schnitt durch ein Ausführungsbeispiel eines erfindungsgemäßen Brennstoffeinspritzventils.
An embodiment of the invention is shown in simplified form in the drawing and explained in more detail in the following description. Show it:
Fig. 1
a schematic section through an embodiment of a fuel injection valve according to the invention.

Beschreibung des AusführungsbeispielsDescription of the embodiment

Ein Brennstoffeinspritzventil 1 ist in der Form eines Brennstoffeinspritzventils für Brennstoffeinspritzanlagen von gemischverdichtenden, fremdgezündeten Brennkraftmaschinen ausgeführt. Das Brennstoffeinspritzventil 1 eignet sich zum direkten Einspritzen von Brennstoff in einen Brennraum 18 einer Brennkraftmaschine.A fuel injection valve 1 is in the form of a fuel injection valve for fuel injection systems of mixture-compression spark-ignition internal combustion engines. The fuel injection valve 1 is suitable for the direct injection of fuel into a combustion chamber 18 of an internal combustion engine.

Das Brennstoffeinspritzventil 1 umfaßt einen Düsenkörper 2 und ein Ventilgehäuse 3. Zuströmseitig ist ein Zulaufstutzen 4 ausgebildet, in welchem eine Zwischenhülse 5 zur Verbindung des Brennstoffeinspritzventils 1 mit einer Brennstoffverteilerleitung 6 angeordnet ist. Die Abdichtung zwischen dem Brennstoffeinspritzventil 1 und der Zwischenhülse 5 sowie zwischen der Zwischenhülse 5 und der Brennstoffverteilerleitung 6 erfolgt mittels Dichtringen 7 und 8. Stützbauteile 9 und 10 sorgen für eine korrekte Montageposition der oben genannten Bauteile zueinander.The fuel injection valve 1 comprises a nozzle body 2 and a valve housing 3. On the inflow side, an inlet nozzle 4 is formed, in which an intermediate sleeve 5 is arranged for connection of the fuel injection valve 1 with a fuel distributor line 6. The seal between the fuel injection valve 1 and the intermediate sleeve 5 and between the intermediate sleeve 5 and the fuel distributor line 6 by means of sealing rings 7 and 8. Support members 9 and 10 ensure a correct mounting position of the above components to each other.

Das Brennstoffeinspritzventil 1 ist in einen Zylinderkopf 11 der Brennkraftmaschine eingesetzt und wird dort mittels eines nur andeutungsweise dargestellten Niederhalters 12, welcher beispielsweise als Spannpratze oder Federhülse ausgebildet sein kann, ortsfest und verdrehsicher fixiert.The fuel injection valve 1 is inserted into a cylinder head 11 of the internal combustion engine and is fixed there by means of a hold-down only 12, which may be formed, for example, as a clamping claw or spring sleeve, fixed and secured against rotation.

Zwischen einer Wandung 13 des Zylinderkopfes 11 ist ein Ringspalt 14 ausgebildet, welcher eine gewisse Weite aufweisen muß, damit einerseits das Brennstoffeinspritzventil 1 ohne zu großen Kraftaufwand, welcher u. U. zu Beschädigungen des Brennstoffeinspritzventils 1 führen könnte, montierbar ist, und welcher andererseits eine thermische Ausdehnung der Bauteile bei der Erwärmung durch den Betrieb der Brennkraftmaschine erlaubt.Between a wall 13 of the cylinder head 11, an annular gap 14 is formed, which must have a certain width, so on the one hand, the fuel injector 1 without too much effort, which u. U. could lead to damage to the fuel injection valve 1, is mountable, and on the other hand, a thermal expansion of the components in the heating by the operation of the internal combustion engine allowed.

Zur Abdichtung des Zylinderkopfes 11 gegen den Brennraum ist ein Dichtring 15 vorgesehen, welcher in einer Ausnehmung 16 des Düsenkörpers 2 des Brennstoffeinspritzventils 1 angeordnet ist. Der Dichtring 15 besteht vorzugsweise aus Teflon®, um eine zuverlässige Dichtwirkung bei hoher Stabilität zu erzielen.For sealing the cylinder head 11 against the combustion chamber, a sealing ring 15 is provided, which is arranged in a recess 16 of the nozzle body 2 of the fuel injection valve 1. The sealing ring 15 is preferably made of Teflon® in order to achieve a reliable sealing effect with high stability.

Abströmseitig des Dichtrings 15 ist der Ringspalt 14 erfindungsgemäß durch eine Beschichtung 17 ausgefüllt, welche verhindert, daß Brennstoff-Luft-Gemisch in den Ringspalt 14 eindringt und nach der Zündung der im Brennraum 18 befindlichen Gemischwolke unter Ablagerung von Verkokungsrückständen abbrennt. Bei festen Beschichtungen darf nicht der gesamte Raum ausgefüllt werden, da sonst Einbautoleranzen nicht ausgleichbar sind (z. B. Kippen des Einspritzventiles). Muß das Brennstoffeinspritzventil 1 aus dem Zylinderkopf 11 ausgebaut werden, wird dies ohne die erfindungsgemäße Beschichtung 17 durch die festgebackenen Verkokungsrückstände erheblich erschwert, wodurch es zu Beschädigungen des Brennstoffeinspritzventils 1 bis hin zur völligen Zerstörung und zu Schäden an der Wandung 13 des Zylinderkopfes 11 kommen kann.Outflow side of the sealing ring 15 of the annular gap 14 is inventively filled by a coating 17, which prevents the fuel-air mixture penetrates into the annular gap 14 and burns after ignition of the mixture in the combustion chamber 18 mixture cloud under deposition of coking residues. For solid coatings, the entire room must not be filled, as otherwise installation tolerances can not be compensated (eg tilting of the injection valve). Must the fuel injector 1 are removed from the cylinder head 11, this is considerably more difficult without the coating 17 according to the invention by festgeschackenen coking, which can lead to damage of the fuel injector 1 to the complete destruction and damage to the wall 13 of the cylinder head 11.

Weiterhin vermindert die Beschichtung 17 eine zu hohe thermische Belastung des Dichtrings 15, welche bei der Inbetriebnahme der Brennkraftmaschine auftritt. Die Beschichtung 17 muß somit vorzugsweise bis 200°C temperaturbeständig sein und resistent gegen die Brennraumatmosphäre sein, damit ein möglicher Kontakt zwischen den im Brennraum 18 vorhandenen Gemischen und dem Material der Beschichtung 17 nicht zerstörerisch wirkt.Furthermore, the coating 17 reduces too high a thermal load on the sealing ring 15, which occurs when the internal combustion engine is put into operation. The coating 17 must therefore preferably be temperature-resistant up to 200 ° C. and be resistant to the combustion chamber atmosphere, so that a possible contact between the mixtures present in the combustion chamber 18 and the material of the coating 17 does not have a destructive effect.

Die Beschichtung 17 kann dabei entweder vor der Montage auf den Düsenkörper 2 des Brennstoffeinspritzventils 1 aufgebracht werden, oder aber sie wird nach der Montage des Brennstoffeinspritzventils 1 in den Ringspalt 14 eingebracht. Die Beschichtung 17 kann somit entweder fest oder pastenförmig und streichfähig oder flüssig sein. Sie kann beispielsweise aus einer Tube oder einer ähnlichen Vorrichtung in den Ringspalt 14 eingespritzt werden.The coating 17 can either be applied to the nozzle body 2 of the fuel injection valve 1 before assembly, or else it is introduced into the annular gap 14 after installation of the fuel injection valve 1. The coating 17 may thus be either solid or pasty and brushable or liquid. It can for example be injected from a tube or a similar device in the annular gap 14.

Beispielsweise kann die Beschichtung aus einer dünnen Teflon®-Schicht bestehen. Weiterhin ist es auch denkbar, diese einstückig mit dem ebenfalls aus Teflon® bestehenden Dichtring 15 auszubilden.For example, the coating may consist of a thin Teflon® layer. Furthermore, it is also conceivable to form these integrally with the likewise made of Teflon ® sealing ring 15.

Die Beschichtung 17 ist dabei an dem abströmseitigen Ende des Düsenkörpers 2 des Brennstoffeinspritzventils 1 so angebracht, daß sie den sich abströmseitig des Dichtrings 15 erstreckenden Teil des Ringspalts 14 vollständig auf der gesamten axialen Länge zwischen dem Dichtring 15 und dem Brennraum 18 einnimmt. Dadurch wird jegliches Eindringen von Gemisch in den Ringspalt 14 unterbunden.The coating 17 is attached to the downstream end of the nozzle body 2 of the fuel injection valve 1 so that it occupies the outflow side of the sealing ring 15 extending part of the annular gap 14 completely on the entire axial length between the sealing ring 15 and the combustion chamber 18. As a result, any penetration of mixture into the annular gap 14 is prevented.

Die Erfindung ist nicht auf das dargestellte Ausführungsbeispiel beschränkt und für beliebige Bauweisen von Brennstoffeinspritzventilen 1, beispielsweise für Brennstoffeinspritzventile 1 mit Anbindung an ein Common-Rail-System, anwendbar.The invention is not limited to the illustrated embodiment and for any construction of fuel injectors 1, for example, for fuel injectors 1 with connection to a common rail system, applicable.

Claims (8)

  1. Fuel injection system having a fuel injection valve (1) which can be fastened in a cylinder head (11), in particular for the direct injection of fuel into the combustion chamber (18) of a mixture-compression, spark-ignition internal combustion engine, having a nozzle body (2) and a sealing ring (15) which seals off the nozzle body (2) against the cylinder head (11) of the internal combustion engine,
    characterized
    in that, in an annular gap (14) formed between a wall (13) of the cylinder head (11) and the nozzle body (2) of the fuel injection valve (1), an adhesion-reducing coating (17) is provided on the nozzle body (2) at least on that side of the sealing ring (15) which faces towards the combustion chamber (18).
  2. Fuel injection system according to Claim 1,
    characterized
    in that the coating (17) is arranged only at the outflow side of the sealing ring (15).
  3. Fuel injection system according to Claim 2,
    characterized
    in that the coating (17) extends over the entire axial length of the annular gap (14) between the sealing ring (15) and the combustion chamber (18).
  4. Fuel injection system according to one of Claims 1 to 3,
    characterized
    in that the coating (17) has a solid consistency.
  5. Fuel injection system according to Claim 4,
    characterized
    in that the coating (17) is composed of a thin Teflon® layer.
  6. Fuel injection system according to Claim 1,
    characterized
    in that the coating is also formed in one piece with the sealing ring (15).
  7. Fuel injection system according to one of Claims 1 to 3,
    characterized
    in that the coating (17) has a paste-like or liquid consistency.
  8. Fuel injection system according to one of Claims 1 to 7,
    characterized
    in that the coating (17) is temperature-resistant up to at least 200°C.
EP02792620A 2002-01-03 2002-11-29 Fuel injection valve Expired - Lifetime EP1463886B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10200044A DE10200044A1 (en) 2002-01-03 2002-01-03 Fuel injection valve, in particular, for an internal combustion engine with external ignition comprises an anti-friction coating in the gap between the bore in the cylinder head and the valve nozzle
DE10200044 2002-01-03
PCT/DE2002/004385 WO2003060316A1 (en) 2002-01-03 2002-11-29 Fuel injection valve

Publications (2)

Publication Number Publication Date
EP1463886A1 EP1463886A1 (en) 2004-10-06
EP1463886B1 true EP1463886B1 (en) 2008-01-16

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EP02792620A Expired - Lifetime EP1463886B1 (en) 2002-01-03 2002-11-29 Fuel injection valve

Country Status (6)

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US (1) US20040124276A1 (en)
EP (1) EP1463886B1 (en)
JP (1) JP2005515348A (en)
KR (1) KR20040068608A (en)
DE (2) DE10200044A1 (en)
WO (1) WO2003060316A1 (en)

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DE10200044A1 (en) 2003-07-24
EP1463886A1 (en) 2004-10-06
JP2005515348A (en) 2005-05-26
KR20040068608A (en) 2004-07-31
WO2003060316A1 (en) 2003-07-24
US20040124276A1 (en) 2004-07-01
DE50211577D1 (en) 2008-03-06

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