EP1463886A1 - Fuel injection valve - Google Patents

Fuel injection valve

Info

Publication number
EP1463886A1
EP1463886A1 EP02792620A EP02792620A EP1463886A1 EP 1463886 A1 EP1463886 A1 EP 1463886A1 EP 02792620 A EP02792620 A EP 02792620A EP 02792620 A EP02792620 A EP 02792620A EP 1463886 A1 EP1463886 A1 EP 1463886A1
Authority
EP
European Patent Office
Prior art keywords
injection valve
fuel injection
coating
sealing ring
fuel
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP02792620A
Other languages
German (de)
French (fr)
Other versions
EP1463886B1 (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
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1463886A1 publication Critical patent/EP1463886A1/en
Application granted granted Critical
Publication of EP1463886B1 publication Critical patent/EP1463886B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • 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 injector according to the preamble of the main claim.
  • an electromagnetic fuel injection valve and a suitable fastening structure are known with which the requirements for the sealing effect, the thermal resistance and the pressure resistance are met for an internal combustion engine with a cylinder injection system. Particular care is taken to seal the area in the immediate vicinity of the cylinder in which the electromagnetic fuel injector is attached, as well as to an area further away.
  • a first sealing section with a first sealing ring which is designed as a corrugated washer, lies at a point close to the cylinder and between the fuel injection valve and the cylinder head.
  • a second sealing section with a second sealing ring which is also designed as a corrugated washer, is positioned at a location which is further away from the cylinder than the first sealing section.
  • Fuel injector is particularly high
  • the fuel injector according to the invention with the characterizing features of the main claim has the advantage that a coating placed on the tip of the fuel injector and filling the annular gap between the fuel injector and the cylinder wall prevents the penetration and subsequent burning of fuel in the annular gap. As a result, deposits of coking residues in the annular gap can be avoided on the one hand, and the thermal load on the sealing ring can be reduced on the other.
  • the coating can be solid or pasty or liquid, depending on the requirements placed on it.
  • the entire space must not be filled, as otherwise installation tolerances cannot be compensated for (e.g. tilting of the injection valve).
  • the coating fills the entire downstream part of the annular gap, so that any penetration of the mixture is prevented.
  • the coating can be in the form of a thin Teflon layer, which can be formed in one piece with the sealing ring, which is also made of Teflon.
  • Fig. 1 shows a schematic section through an embodiment of a fuel injector according to the invention.
  • a fuel injection valve 1 is in the form of a fuel injection valve for fuel injection systems ⁇ n mixture-compressing, spark-ignited
  • Fuel injection valve 1 is suitable for injecting fuel directly into a combustion chamber 18 of an internal combustion engine.
  • the fuel injector 1 comprises a nozzle body 2 and a valve housing 3. On the inflow side, an inlet connection 4 is formed, in which an intermediate sleeve 5 for connecting the fuel injector 1 to a fuel distributor line 6 is arranged.
  • 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 is carried out by means of sealing rings 7 and 8.
  • Support components 9 and 10 ensure a correct mounting position of the above-mentioned components with respect to one another.
  • the fuel injector 1 is inserted into a cylinder head 11 of the internal combustion engine and is fixed there in a stationary and non-rotatable manner by means of a hold-down device 12, which is only indicated by 1 , which can be designed, for example, as a clamping claw or spring sleeve.
  • annular gap 14 is formed, which must have a certain width, so that on the one hand the fuel injector 1 without too much effort, which u. U.. could lead to damage to the fuel injector 1, is mountable, and which, on the other hand, allows thermal expansion of the components when heated by the operation of the internal combustion engine.
  • 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 preferably consists of
  • the annular gap 14 is filled according to the invention by a coating 17 which prevents the fuel-air mixture from penetrating into the annular gap 14 and burning off after the ignition of the mixture cloud in the combustion chamber 18 with deposits of coking residues.
  • a coating 17 which prevents the fuel-air mixture from penetrating into the annular gap 14 and burning off after the ignition of the mixture cloud in the combustion chamber 18 with deposits of coking residues.
  • the entire space must not be filled, as otherwise installation tolerances cannot be compensated for (e.g. tilting of the injection valve).
  • the inventive coating 17 made considerably more difficult by the caked carbon residues, making it the Zylinderkop cause damage to the fuel injector 1 'to the point of complete destruction and damage to the wall 13 it 11 can.
  • the coating 17 reduces an excessive thermal load on the sealing ring 15, which occurs when the internal combustion engine is started up.
  • the coating 17 must therefore preferably be temperature-resistant up to 200 ° C. and be resistant to the combustion chamber atmosphere, so that 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 injector 1 or to the wall 13 of the cylinder head 11 before assembly, or it is introduced into the annular gap 14 after the assembly of the fuel injector 1.
  • the coating 17 can thus be either solid or pasty and spreadable or liquid. For example, it can be injected into the annular gap 14 from a tube or a similar device.
  • the coating can consist of a thin Teflon layer.
  • Teflon layer a thin Teflon layer.
  • the coating 17 is attached to the downstream end of the nozzle body 2 of the fuel injector 1 so that it completely occupies the part of the annular gap 14 extending downstream of the sealing ring 15 over the entire axial length between the sealing ring 15 and the combustion chamber 18. This prevents any penetration of mixture into the annular gap 14.
  • the invention is not limited to the exemplary embodiment shown and can be used for any construction of fuel injection valves 1, for example for fuel injection valves 1 with a connection to a Coramon rail system.

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)

Abstract

The invention relates to a fuel injection valve (1) for directly injecting fuel into the combustion chamber (18) of a mixture-compressing, spark-ignition internal combustion engine. Said fuel injection valve comprises a nozzle body (2) and a sealing ring (15) which seals the fuel injection valve (1) from a cylinder head (11) of the internal combustion engine. An adhesion-reducing coating is provided 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).

Description

Brennstoffeinspritzventil Fuel injector
Stand der TechnikState of the art
Die Erfindung geht aus von einem Brennstoffeinspritzventil nach der Gattung des Hauptanspruchs .The invention relates to a fuel injector according to the preamble of the main claim.
Aus der DE 196 00 403 AI 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. Nachteilig _ an dem aus der DE 196 00 403 AI bekanntenFrom DE 196 00 403 AI, for example, an electromagnetic fuel injection valve and a suitable fastening structure are known with which the requirements for the sealing effect, the thermal resistance and the pressure resistance are met for an internal combustion engine with a cylinder injection system. Particular care is taken to seal the area in the immediate vicinity of the cylinder in which the electromagnetic fuel injector is attached, as well as to an area further away. The result of this is that, according to the invention, a first sealing section with a first sealing ring, which is designed as a corrugated washer, lies at a point close to the cylinder and between the fuel injection valve and the cylinder head. Furthermore, a second sealing section with a second sealing ring, which is also designed as a corrugated washer, is positioned at a location which is further away from the cylinder than the first sealing section. Disadvantageous _ in the known from DE 196 00 403 AI
Brennstoffeinspritzventil ist insbesondere die hoheFuel injector is particularly high
Verkokungsneigung des zwischen dem Brennstoffeinspritzventil und der Wandung des Zylinderkopfes ausgebildeten Spalts abströ seitig des Dichtrings, was zu einem erheblichenCoking tendency of the gap formed between the fuel injection valve and the wall of the cylinder head on the outflow side of the sealing ring, which leads to a considerable
Kraftaufwand und möglichen Beschädigungen bei der Demontage des Brennstoffeinspritzventils aus dem Zylinderkopf führt.Exertion of force and possible damage when dismantling the fuel injector 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 via the annular gap is considerable when the internal combustion engine is started up and can lead to the destruction of the sealing ring and subsequent malfunctions.
Vorteile der ErfindungAdvantages of the invention
Das erfindungsgemäße Brennstoffeinspritzventil mit den kennzeichnenden Merkmalen des Hauptanspruchs 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 injector according to the invention with the characterizing features of the main claim has the advantage that a coating placed on the tip of the fuel injector and filling the annular gap between the fuel injector and the cylinder wall prevents the penetration and subsequent burning of fuel in the annular gap. As a result, deposits of coking residues in the annular gap can be avoided on the one hand, and the thermal load on the sealing ring can be reduced on the other.
Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen des im Hauptanspruch angegebenen Brennstoffeinspritzventils möglich.The measures listed in the subclaims permit advantageous developments of the fuel injector specified in the main claim.
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) . Vorteilhaf erweise füllt die Beschichtung den gesamten abströmseitigen Teil des Ringspalts aus, so daß jegliches Eindringen von Gemisch unterbunden wird.With solid coatings, the entire space must not be filled, as otherwise installation tolerances cannot be compensated for (e.g. tilting of the injection valve). Advantageously, the coating fills the entire downstream part of the annular gap, so that any penetration of the 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 can be in the form of a thin Teflon layer, which can be formed in one piece with the sealing ring, which is also made of Teflon.
Zeichnungdrawing
Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung vereinfacht dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen: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 einen schematischen Schnitt durch ein Ausführungsbeispiel eines erfindungsgemäßen Brennstoffeinspritzventils .Fig. 1 shows a schematic section through an embodiment of a fuel injector according to the invention.
Beschreibung des AusführungsbeispielsDescription of the embodiment
Ein Brennstoffeinspritzventil 1 ist in der Form eines Brennstoffeinspritzventils für Brennstoffeinspritzanlagen λ n gemischverdichtenden, fremdgezündetenA fuel injection valve 1 is in the form of a fuel injection valve for fuel injection systems λ n mixture-compressing, spark-ignited
Brennkraftmaschinen ausgeführt . DasRunning internal combustion engines. The
Brennstoffeinspritzventil 1 eignet sich zum direkten Einspritzen von Brennstoff in einen Brennraum 18 einer Brennkraftmaschine .Fuel injection valve 1 is suitable for injecting fuel directly 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. Das Brennstoffeinspritzventil 1 ist in einen Zylinderkopf 11 der Brennkraftmaschine eingesetzt und wird dort mittels eines nur andeutungsweise1 dargestellten Niederhalters 12, welcher beispielsweise als Spannpratze oder Federhülse ausgebildet sein kann, ortsfest und verdrehsicher fixiert.The fuel injector 1 comprises a nozzle body 2 and a valve housing 3. On the inflow side, an inlet connection 4 is formed, in which an intermediate sleeve 5 for connecting the fuel injector 1 to a fuel distributor line 6 is arranged. 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 is carried out by means of sealing rings 7 and 8. Support components 9 and 10 ensure a correct mounting position of the above-mentioned components with respect to one another. The fuel injector 1 is inserted into a cylinder head 11 of the internal combustion engine and is fixed there in a stationary and non-rotatable manner by means of a hold-down device 12, which is only indicated by 1 , which can be designed, for example, as a clamping claw or spring sleeve.
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 that on the one hand the fuel injector 1 without too much effort, which u. U.. could lead to damage to the fuel injector 1, is mountable, and which, on the other hand, allows thermal expansion of the components when heated by the operation of the internal combustion engine.
Zur Abdichtung des Zylinderkopfes 11 gegen den Brennraum ist ein Dichtring 15 vorgesehen, welcher in einer Ausnehmung 16 des Düsenkörpers 2 des Brennsto feinspritzventils 1 angeordnet ist . Der Dichtring 15 besteht vorzugsweise ausTo seal 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 preferably consists of
® Teflon , um eine zuverlässige Dichtwirkung bei hoher® Teflon to ensure a reliable sealing effect at high
Stabilität zu erzielen.To achieve 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 n 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 Zylinderkop es 11 kommen kann. 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 .On the outflow side of the sealing ring 15, the annular gap 14 is filled according to the invention by a coating 17 which prevents the fuel-air mixture from penetrating into the annular gap 14 and burning off after the ignition of the mixture cloud in the combustion chamber 18 with deposits of coking residues. With solid coatings, the entire space must not be filled, as otherwise installation tolerances cannot be compensated for (e.g. tilting of the injection valve). Has the fuel injection valve 1 from the cylinder head n to be removed, this is without the inventive coating 17 made considerably more difficult by the caked carbon residues, making it the Zylinderkop cause damage to the fuel injector 1 'to the point of complete destruction and damage to the wall 13 it 11 can. Furthermore, the coating 17 reduces an excessive thermal load on the sealing ring 15, which occurs when the internal combustion engine is started up. The coating 17 must therefore preferably be temperature-resistant up to 200 ° C. and be resistant to the combustion chamber atmosphere, so that 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 oder auf die Wandung 13 des Zylinderkopfes 11 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 injector 1 or to the wall 13 of the cylinder head 11 before assembly, or it is introduced into the annular gap 14 after the assembly of the fuel injector 1. The coating 17 can thus be either solid or pasty and spreadable or liquid. For example, it can be injected into the annular gap 14 from a tube or a similar device.
Beispielsweise kann die Beschichtung aus einer dünnenTeflon -Schicht bestehen. Weiterhin ist es auch denkbar,For example, the coating can consist of a thin Teflon layer. Furthermore, it is also conceivable
® diese einstückig mit dem ebenfalls aus Teflon bestehenden® these in one piece with the Teflon
Dichtring 15 auszubilden.Form 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 injector 1 so that it completely occupies the part of the annular gap 14 extending downstream of the sealing ring 15 over the entire axial length between the sealing ring 15 and the combustion chamber 18. This prevents any penetration of mixture into the annular gap 14.
Die Erfindung ist nicht auf das dargestellte Ausführungsbeispiel beschränkt und für beliebige Bauweisen von Brennstoffeinspritzventilen 1, beispielsweise für Brennstoffeinspritzventile 1 mit Anbindung an ein Coramon- Rail-System, anwendbar. The invention is not limited to the exemplary embodiment shown and can be used for any construction of fuel injection valves 1, for example for fuel injection valves 1 with a connection to a Coramon rail system.

Claims

Ansprüche Expectations
1. Brennstoffeinspritzventil (1), insbesondere zum direkten Einspritzen von Brennstoff in den Brennraum (18) einer gemischverdichtenden, fremdgezündeten Brennkraftmaschine, mit einem Düsenkörper (2) und einem Dichtring (15) , der den Düsenkörper (2) gegen einen Zylinderkopf (11) der Brennkraftmaschine abdichtet, dadurch gekennzeichnet, daß in einem zwischen einer Wandung (13) des Zylinderkopfes (11) und dem Düsenkörper (2) des Brennstoffeinspritzventils (1) ausgebildeten Ringspalt (14) zumindest auf der dem1. Fuel injection valve (1), in particular for the direct injection of fuel into the combustion chamber (18) of a mixture-compressing, spark-ignition internal combustion engine, with a nozzle body (2) and a sealing ring (15) which seals the nozzle body (2) against a cylinder head (11) seals 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) at least on the
Brennraum (18) zugewandten Seite des Dichtrings (15) eine haftvermindernde Beschichtung (17) vorgesehen ist.An adhesion-reducing coating (17) is provided on the side of the sealing ring (15) facing the combustion chamber (18).
2. Brennstoffeinspritzventil nach Anspruch 1, dadurch gekennzeichnet, daß die Beschichtung (17) nur abströmseitig des Dichtrings (15) angeordnet ist.2. Fuel injection valve according to claim 1, characterized in that the coating (17) is arranged only on the downstream side of the sealing ring (15).
3. Brennstoffeinspritzventil nach Anspruch 2, dadurch gekennzeichnet, daß sich die Beschichtung (17) auf die gesamte axiale Länge des Ringspalts (14) zwischen dem Dichtring (15) und dem Brennraum (18)' erstreckt. 3. Fuel injection valve 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 . Brennstof feinsprit zventi l nach einem der Ansprüche 1 bis4th Fuel fine fuel zventi l according to any one of claims 1 to
3 , dadurch gekennzeichnet, daß die Beschichtung (17) eine feste Konsistenz aufweist.3, characterized in that the coating (17) has a firm consistency.
5. Brennstoffeinspritzventil nach Anspruch 4, dadurch gekennzeichnet,5. Fuel injection valve according to claim 4, characterized in that
® daß die Beschichtung (17) aus einer dünnen Teflon -Schicht besteht .® that the coating (17) consists of a thin Teflon layer.
6. Brennstoffeinspritzventil nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die Beschichtung einstückig mit dem Dichtring (15) ausgebildet ist.6. Fuel injection valve according to one of claims 1 to 5, characterized in that the coating is formed in one piece with the sealing ring (15).
7. Brennstoffeinspritzventil nach einem der Ansprüche 1 bis7. Fuel injection valve according to one of claims 1 to
3, dadurch gekennzeichnet, daß die Beschichtung (17) eine pastenförmige oder flüssige3, characterized in that the coating (17) is a pasty or liquid
Konsistenz aufweist .Has consistency.
8. Brennstoffeinspritzventil nach einem der Ansprüche 1 bis8. Fuel injection valve according to one of claims 1 to
7, dadurch gekennzeichnet, daß die Beschichtung (17) bis mindestens 200°C temperaturbeständig ist. 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
DE10200044 2002-01-03
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
PCT/DE2002/004385 WO2003060316A1 (en) 2002-01-03 2002-11-29 Fuel injection valve

Publications (2)

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

Family

ID=7711449

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02792620A Expired - Lifetime EP1463886B1 (en) 2002-01-03 2002-11-29 Fuel injection valve

Country Status (6)

Country Link
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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DE102004060983B4 (en) * 2004-12-17 2017-02-02 Robert Bosch Gmbh Fuel injector
EP1818535B1 (en) * 2006-02-08 2008-09-17 Siemens Aktiengesellschaft Coupling device for connecting an injector to a fluid supply
DE102009045692A1 (en) 2009-10-14 2011-04-21 Robert Bosch Gmbh Method for mounting a sealing ring
DE102018106822A1 (en) * 2018-03-22 2019-09-26 Volkswagen Ag Regeneration method for reducing the degree of coking of an annular gap surrounding an injector

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Also Published As

Publication number Publication date
KR20040068608A (en) 2004-07-31
DE10200044A1 (en) 2003-07-24
DE50211577D1 (en) 2008-03-06
WO2003060316A1 (en) 2003-07-24
US20040124276A1 (en) 2004-07-01
EP1463886B1 (en) 2008-01-16
JP2005515348A (en) 2005-05-26

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