EP1658428B8 - Fuel injection valve - Google Patents

Fuel injection valve

Info

Publication number
EP1658428B8
EP1658428B8 EP04766521A EP04766521A EP1658428B8 EP 1658428 B8 EP1658428 B8 EP 1658428B8 EP 04766521 A EP04766521 A EP 04766521A EP 04766521 A EP04766521 A EP 04766521A EP 1658428 B8 EP1658428 B8 EP 1658428B8
Authority
EP
European Patent Office
Prior art keywords
fuel injection
injection valve
seal
valve according
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.)
Expired - Lifetime
Application number
EP04766521A
Other languages
German (de)
French (fr)
Other versions
EP1658428A1 (en
EP1658428B1 (en
Inventor
Gernot Wuerfel
Detlef Nowak
Andreas Mlejnek
Klaus Roessler
Guenter Hoenig
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
Mercedes Benz Group AG
Original Assignee
Robert Bosch GmbH
Daimler AG
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, Daimler AG filed Critical Robert Bosch GmbH
Publication of EP1658428A1 publication Critical patent/EP1658428A1/en
Application granted granted Critical
Publication of EP1658428B1 publication Critical patent/EP1658428B1/en
Publication of EP1658428B8 publication Critical patent/EP1658428B8/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
    • 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
    • F02M53/00—Fuel-injection apparatus characterised by having heating, cooling or thermally-insulating means
    • F02M53/04—Injectors with heating, cooling, or thermally-insulating means

Definitions

  • the invention relates to a fuel injector according to the preamble of the main claim.
  • EP 0 828 075 A1 discloses a fuel injection valve for the direct injection of fuel into the combustion chamber of an internal combustion engine, which has a device for temperature adjustment in this area in order to reduce deposits in the area of the valve tip.
  • the device is designed in the form of a coating of a thermally conductive material on the valve tip.
  • a fuel injection valve for the direct injection of fuel into the combustion chamber of a mixture-compressing, spark-ignition internal combustion engine. It comprises a valve housing formed from a nozzle body and a sealing ring which seals the fuel injector against one Seals the cylinder head of the internal combustion engine.
  • the sealing ring has a convexly curved profile, with two ends of the sealing ring overlapping axially in a step-like manner.
  • a disadvantage of the fuel injector known from DE 101 09 407 AI is in particular the air gap present between the fuel injector and the cylinder head, which allows only a reduced heat transfer. This is disadvantageous for reducing deposits on the valve tip, since the temperature in the area of the spray openings must be as low as possible in order to avoid deposits.
  • the fuel injector according to the invention with the characterizing features of the main claim has the advantage that a seal extending over the entire axial length and provided with a suitable structure is provided between the cylinder head and the nozzle body, which on the one hand has a reliable sealing effect and on the other hand an effective heat dissipation from Nozzle body allows.
  • the seal can also be constructed from several layers, which gives it greater stability and less susceptibility to damage during assembly.
  • a cover plate can be attached to an outflow end of the seal, which fulfills the function of a heat shield.
  • the cover plate can have an opening for the sprayed fuel jets or a plurality of spray openings.
  • the seal is advantageously made of a metallic material with an amorphous structure, as a result of which a smooth surface can be achieved.
  • Fig. 1 shows a schematic. Section through a fuel injection valve according to the prior art
  • FIG. 2 shows a schematic, partially sectioned view of a first exemplary embodiment of a fuel injector according to the invention
  • FIG. 3 shows a schematic, partially sectioned view of a second exemplary embodiment of a fuel injector according to the invention
  • FIG. 4 shows a schematic, partially sectioned view of a third exemplary embodiment of a fuel injector according to the invention
  • FIG. 5 shows a schematic, partially sectional view of a fourth exemplary embodiment of a fuel injector according to the invention
  • Fig. 6 is a schematic, partially sectioned view of a fifth embodiment of a fuel injector according to the invention
  • Fig. 7 is a schematic, partially sectioned view of a sixth embodiment of a fuel injector according to the invention.
  • the fuel injector 1 is in the form of a fuel injector for fuel injection systems of mixed compression, spark-ignited
  • Fuel injection valve 1 is particularly suitable for injecting fuel directly into a combustion chamber 2 of an internal combustion engine.
  • the fuel injection valve 1 comprises a nozzle body 3, which is sealed by a sealing ring 4 against a cylinder head 5 of the internal combustion engine.
  • the sealing ring 4 is made, for example, of an elastomer, e.g. B. made of a Teflon-coated material and ensures a sealing effect in the cylinder head 5 by a slightly larger diameter compared to the nozzle body 3.
  • the fuel injector 1 further comprises a housing ⁇ , an electrical plug contact 7 for actuating the fuel injector 1 and a fuel inlet 8, via which the fuel is supplied.
  • the supply of the fuel can take place, for example, by means of a fuel distributor line, not shown.
  • a disadvantage of the sealing rings 4 known from the prior art is in particular the poor heat transfer between the nozzle body 3 and the cylinder head 5 due to an air gap 9 present on the downstream side between the fuel injection valve 1 and the cylinder head 5 to counteract coking of the spray openings, the lowest possible temperature in the area of the valve tip is desirable. This counteracts complete evaporation of the fuel remaining in the region of the valve tip after the injection process. If the fuel remains liquid, the combustion residues and contaminants cannot deposit in the area of the valve tip and are removed during the next injection cycle.
  • the seals 10 described below have in common that they have a corrugated tube design and thus on the one hand offer a good sealing effect and on the other hand offer a sufficiently large contact surface for effective heat transfer between the fuel injection valve 1 and the cylinder head 5.
  • the seals 10 are designed so that they are short and wide when not installed and are compressed somewhat by the installation and thus elongated. This allows a very good fit to be achieved.
  • the seals 10 are made of a highly thermally conductive material such.
  • Exemplary embodiments of fuel injection valves 1 equipped with corresponding seals 10 are described below by way of example. With the exception of the measures according to the invention, the fuel injection valves 1 can be configured similarly to the fuel injection valve 1 shown in FIG. 1.
  • FIG. 2 shows a first exemplary embodiment of a fuel injector 1 designed according to the invention.
  • the seal 10 is designed in the simplest manner in the form of a corrugated tube.
  • the seal 10 is open at both ends and can therefore be installed particularly easily.
  • the seal 10 can be preassembled on the nozzle body 3 of the fuel injection valve 1 and then used together with the latter in the cylinder head 5.
  • the seal 10 is designed in the form of a tubular seal 10 with protuberances 11.
  • the protuberances 11 are approximately semi-circular in section.
  • the advantage of this variant is a somewhat larger contact surface on the nozzle body 3 with an improved thermal conductivity.
  • FIG. 4 shows a third exemplary embodiment of a fuel injection valve 1 designed according to the invention.
  • the seal 10 is designed to be pleated and shaped into a bellows 10.
  • the thermal conductivity and sealing ability correspond approximately to the first exemplary embodiment described in FIG. 2.
  • the seal 10 is constructed from several layers 12 in a sandwich process. This increases in particular the durability of the seal 10, which cannot warp so easily during assembly and is therefore less susceptible to damage.
  • the individual layers 12 can in turn each have a corrugated tube shape and be glued to one another or only connected to one another at their ends.
  • FIG. 6 shows a fifth exemplary embodiment of a fuel injector 1 designed according to the invention.
  • the seal 10 can here in section like that
  • Embodiments can be designed, wherein in Fig. 6
  • Corrugated tube shape was selected, and is additionally provided at a downstream end 13 with a cover plate 14, which has an opening 15 for at least one
  • Combustion chamber 2 has injected fuel jets.
  • Cover plate 14 also has the function of a heat shield and protects the spray openings from the im
  • FIG. 7 shows a sixth exemplary embodiment of a fuel injection valve 1 designed according to the invention.
  • the seal 10 can here as in the embodiment shown in Fig. 6 in section like that
  • Embodiments can be designed, the corrugated tube shape was also selected in Fig. 7.
  • the seal 10 is also at an outflow end 13 with a
  • cover plate 14 in which the spray openings can be incorporated directly.
  • the cover plate 14 also performs the function of a heat shield and protects the downstream end of the
  • Fuel injector 1 before the temperature prevailing in the combustion chamber is not limited to the exemplary embodiments shown and can also be used for other cross-sectional shapes of seals 10 and for any construction of fuel injection valves 1, for example for fuel injection valves 1 with a connection to an intake manifold or a common rail system.
  • the individual features of the different exemplary embodiments can be combined with one another as desired.

Landscapes

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

Abstract

The invention relates to a fuel injection valve (1), in particular, for the direct injection of fuel into the combustion chamber of a compressed-mixture, spark-ignition internal combustion engine, comprising a valve housing, formed by a nozzle body (3) and a seal (10), which seals the fuel injection valve (1) against a cylinder head (5) of the internal combustion engine. The seal (10) has a sleeve-like embodiment with a structured cross-section and extends over the axial length of the nozzle body (3).

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.
Beispielsweise ist aus der EP 0 828 075 AI ein Brennstoffeinspritzventil zum direkten Einspritzen von Brennstoff in den Brennraum einer Brennkraftmaschine bekannt, welches zur Verminderung von Ablagerungen im Bereich der Ventilspitze eine Vorrichtung zur TemperaturJustierung in diesem Bereich aufweist. Die Vorrichtung ist dabei in Form eines Überzugs aus einem wärmeleitfähigen Material an der Ventilspitze ausgebildet.For example, EP 0 828 075 A1 discloses a fuel injection valve for the direct injection of fuel into the combustion chamber of an internal combustion engine, which has a device for temperature adjustment in this area in order to reduce deposits in the area of the valve tip. The device is designed in the form of a coating of a thermally conductive material on the valve tip.
Nachteilig an dem aus der EP 0 828 075 AI bekannten Brennstoffeinspritzventil sind dabei die hohen Anforderungen an die Paßgenauigkeit der Bauteile sowie die komplizierte Montage, die aufwendig und damit kostenintensiv sind.Disadvantages of the fuel injector known from EP 0 828 075 A1 are the high demands on the fitting accuracy of the components and the complicated assembly, which are complex and therefore cost-intensive.
Weiterhin ist aus der DE 101 09 407 AI ein Brennstoffeinspritzventil zum direkten Einspritzen von Brennstoff in den Brennraum einer gemischverdichtenden, fremdgezündeten Brennkraftmaschine bekannt. Es umfaßt ein aus einem Düsenkörper gebildetes Ventilgehäuse sowie einen Dichtring, der das Brennstoffeinspritzventil gegen einen Zylinderkopf der Brennkraftmaschine abdichtet. Der Dichtring ist konvex gewölbt profiliert, wobei sich zwei Enden des Dichtrings axial stufenförmig überlappen.Furthermore, from DE 101 09 407 AI a fuel injection valve for the direct injection of fuel into the combustion chamber of a mixture-compressing, spark-ignition internal combustion engine is known. It comprises a valve housing formed from a nozzle body and a sealing ring which seals the fuel injector against one Seals the cylinder head of the internal combustion engine. The sealing ring has a convexly curved profile, with two ends of the sealing ring overlapping axially in a step-like manner.
Nachteilig an dem aus der DE 101 09 407 AI bekannten Brennstoffeinspritzventil ist insbesondere der zwischen Brennstoffeinspritzventil und Zylinderkopf vorhandene Luftspalt, welcher nur einen verminderten Wärmeübergang erlaubt. Dies ist für die Reduzierung von Ablagerungen an der Ventilspitze ungünstig, da die Temperatur im Bereich der Abspritzöffnungen möglichst gering sein muß, um Anlagerungen zu vermeiden.A disadvantage of the fuel injector known from DE 101 09 407 AI is in particular the air gap present between the fuel injector and the cylinder head, which allows only a reduced heat transfer. This is disadvantageous for reducing deposits on the valve tip, since the temperature in the area of the spray openings must be as low as possible in order to avoid deposits.
Vorteile der ErfindungAdvantages of the invention
Das erfindungsgemäße Brennstoffeinspritzventil mit den kennzeichnenden Merkmalen des Hauptanspruchs hat demgegenüber den Vorteil, daß eine sich über die gesamte axiale Länge erstreckende, mit einer geeigneten Struktur versehene Dichtung zwischen dem Zylinderkopf und dem Düsenkörper vorgesehen ist, welche einerseits eine zuverlässige Dichtwirkung und andererseits eine effektive Wärmeableitung vom Düsenkörper ermöglicht.The fuel injector according to the invention with the characterizing features of the main claim has the advantage that a seal extending over the entire axial length and provided with a suitable structure is provided between the cylinder head and the nozzle body, which on the one hand has a reliable sealing effect and on the other hand an effective heat dissipation from Nozzle body allows.
Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen des im Hauptanspruch angegebenen Brennstoffeinspritzventils möglich.The measures listed in the subclaims allow advantageous developments of the fuel injector specified in the main claim.
Von Vorteil ist insbesondere, daß beliebige Querschnitte wie z. B. Wellrohre, Faltenbälge und glatt rohrförmige Körper mit beliebig geformten Ausstülpungen möglich sind.It is particularly advantageous that any cross-sections such. B. corrugated pipes, bellows and smooth tubular body with arbitrarily shaped protuberances are possible.
Vorteilhafterweise kann die Dichtung auch aus mehreren Schichten aufgebaut sein, was ihr eine höhere Stabilität und geringere Beschädigungsanfälligkeit bei der Montage verleiht.Advantageously, the seal can also be constructed from several layers, which gives it greater stability and less susceptibility to damage during assembly.
Weiterhin ist von Vorteil, daß an einem abströmseitigen Ende der Dichtung ein Abdeckblech angebracht sein kann, welches die Funktion eines Hitzeschildes erfüllt. Das Abdeckblech kann eine Öffnung für die abgespritzten Brennstoffstrahlen oder mehrere Abspritzöffnungen aufweisen.Another advantage is that a cover plate can be attached to an outflow end of the seal, which fulfills the function of a heat shield. The cover plate can have an opening for the sprayed fuel jets or a plurality of spray openings.
Vorteilhafterweise ist die Dichtung aus einem metallischen Material amorpher Struktur hergestellt, wodurch eine glatte Oberfläche erzielt werden kann.The seal is advantageously made of a metallic material with an amorphous structure, as a result of which a smooth surface can be achieved.
Zeichnungdrawing
Ausführungsbeispiele der Erfindung sind in der Zeichnung vereinfacht dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen:Embodiments of the invention are 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 Brennstoffeinspritzventil gemäß dem Stand der Technik,Fig. 1 shows a schematic. Section through a fuel injection valve according to the prior art,
Fig. 2 eine schematische, teilweise geschnittene Ansicht eines ersten Ausführungsbeispiels eines erfindungsgemäßen Brennstoffeinspritzventils,2 shows a schematic, partially sectioned view of a first exemplary embodiment of a fuel injector according to the invention,
Fig. 3 eine schematische, teilweise geschnittene Ansicht eines zweiten Ausführungsbeispiels eines erfindungsgemäßen Brennstoffeinspritzventils,3 shows a schematic, partially sectioned view of a second exemplary embodiment of a fuel injector according to the invention,
Fig. 4 eine schematische, teilweise geschnittene Ansicht eines dritten Ausführungsbeispiels eines erfindungsgemäßen Brennstoffeinspritzventils,4 shows a schematic, partially sectioned view of a third exemplary embodiment of a fuel injector according to the invention,
Fig. 5 eine schematische, teilweise geschnittene Ansicht eines vierten Ausführungsbeispiels eines erfindungsgemäßen Brennstoffeinspritzventils,5 shows a schematic, partially sectional view of a fourth exemplary embodiment of a fuel injector according to the invention,
Fig. 6 eine schematische, teilweise geschnittene Ansicht eines fünften Ausführungsbeispiels eines erfindungsgemäßen Brennstoffeinspritzventils, und Fig. 7 eine schematische, teilweise geschnittene Ansicht eines sechsten Ausführungsbeispiels eines erfindungsgemäßen Brennstoffeinspritzventils .6 is a schematic, partially sectioned view of a fifth embodiment of a fuel injector according to the invention, and Fig. 7 is a schematic, partially sectioned view of a sixth embodiment of a fuel injector according to the invention.
Beschreibung der AusführungsbeispieleDescription of the embodiments
Bevor anhand der Fig. 2 bis 7 bevorzugte Ausführungsbeispiele eines erfindungsgemäßen Brennstoffeinspritzventils 1 näher beschrieben werden, soll zum besseren Verständnis der Erfindung zunächst anhand von Fig. 1 ein Brennstoffeinspritzventil 1 gemäß dem Stand der Technik bezüglich seiner wesentlichen Bauteile kurz erläutert werden.Before preferred exemplary embodiments of a fuel injector 1 according to the invention are described in more detail with reference to FIGS. 2 to 7, a fuel injector 1 according to the prior art with regard to its essential components will first be briefly explained with reference to FIG. 1 for better understanding of the invention.
Das Brennstoffeinspritzventil 1 ist in der Form eines Brennstoffeinspritzventils für Brennstoffeinspritzanlagen von gemischverdichtenden, fremdgezündetenThe fuel injector 1 is in the form of a fuel injector for fuel injection systems of mixed compression, spark-ignited
Brennkraftmaschinen ausgeführt. DasRunning internal combustion engines. The
Brennstoffeinspritzventil 1 eignet sich insbesondere zum direkten Einspritzen von Brennstoff in einen Brennraum 2 einer Brennkraftmaschine.Fuel injection valve 1 is particularly suitable for injecting fuel directly into a combustion chamber 2 of an internal combustion engine.
Das Brennstoffeinspritzventil 1 umfaßt einen Düsenkörper 3, welcher durch einen Dichtring 4 gegen einen Zylinderkopf 5 der Brennkraftmaschine abgedichtet ist. Der Dichtring 4 ist beispielsweise aus einem Elastomer, z. B. einem teflonbeschichteten Material hergestellt und sorgt durch einen geringfügig größeren Durchmesser im Vergleich zum Düsenkörper 3 für die Dichtwirkung im Zylinderkopf 5.The fuel injection valve 1 comprises a nozzle body 3, which is sealed by a sealing ring 4 against a cylinder head 5 of the internal combustion engine. The sealing ring 4 is made, for example, of an elastomer, e.g. B. made of a Teflon-coated material and ensures a sealing effect in the cylinder head 5 by a slightly larger diameter compared to the nozzle body 3.
Das Brennstoffeinspritzventil 1 umfaßt weiter ein Gehäuse β, eine elektrischen Steckkontakt 7 zur Betätigung des Brennstoffeinspritzventils 1 und einen BrennstoffZulauf 8, über welchen der Brennstoff zugeführt wird. Die Zuleitung des Brennstoffs kann dabei beispielsweise mittels einer nicht weiter dargestellten Brennstoffverteilerleitung erfolgen. Nachteilig an den aus dem Stand der Technik bekannten Dichtringen 4 ist dabei insbesondere der schlechte Wärmeübergang zwischen Düsenkörper 3 und Zylinderkopf 5 durch einen abströmseitig vorhandenen Luftspalt 9 zwischen Brennstoffeinspritzventil 1 und Zylinderkopf 5. Um der bei direkteinspritzenden Brennstoffeinspritzventilen 1 durch die hohen Temperaturen im Brennraum 2 drohenden Verkokung der Abspritzöffnungen zu begegnen, ist eine möglichst geringe Temperatur im Bereich der Ventilspitze wünschenswert. Dadurch wird einer vollständigen Verdampfung des nach dem Einspritzvorgang im Bereich der Ventilspitze verbliebenen Brennstoffs entgegengewirkt. Bleibt der Brennstoff flüssig, können sich die Verbrennungsrückstände und Verunreinigungen nicht im Bereich der Ventilspitze ablagern und werden beim nächsten Einspritzzyklus abtransportiert.The fuel injector 1 further comprises a housing β, an electrical plug contact 7 for actuating the fuel injector 1 and a fuel inlet 8, via which the fuel is supplied. The supply of the fuel can take place, for example, by means of a fuel distributor line, not shown. A disadvantage of the sealing rings 4 known from the prior art is in particular the poor heat transfer between the nozzle body 3 and the cylinder head 5 due to an air gap 9 present on the downstream side between the fuel injection valve 1 and the cylinder head 5 To counteract coking of the spray openings, the lowest possible temperature in the area of the valve tip is desirable. This counteracts complete evaporation of the fuel remaining in the region of the valve tip after the injection process. If the fuel remains liquid, the combustion residues and contaminants cannot deposit in the area of the valve tip and are removed during the next injection cycle.
Dem mangelnden Wärmeübergang zwischen Brennstoffeinspritzventil 1 und Zylinderkopf 5 wirkt eine erfindungsgemäß ausgestaltete Dichtung 10 wie in den Fig. 2 bis 7 in bevorzugten Ausführungsbeispielen dargestellt entgegen .The lack of heat transfer between the fuel injection valve 1 and the cylinder head 5 is counteracted by a seal 10 designed according to the invention, as shown in FIGS. 2 to 7 in preferred exemplary embodiments.
Den im folgenden beschriebenen Dichtungen 10 ist dabei gemeinsam, daß sie wellrohrförmig ausgeführt sind und dadurch einerseits eine gute Dichtwirkung und andererseits eine ausreichend große Anlagefläche für einen effektiven Wärmeübergang zwischen Brennstoffeinspritzventil 1 und Zylinderkopf 5 bieten. Die Dichtungen 10 sind dabei so konzipiert, daß sie in nicht eingebautem Zustand kurz und breit sind und durch den Einbau etwas zusammengedrückt und damit gelängt werden. Dadurch kann eine sehr gute Passung erzielt werden.The seals 10 described below have in common that they have a corrugated tube design and thus on the one hand offer a good sealing effect and on the other hand offer a sufficiently large contact surface for effective heat transfer between the fuel injection valve 1 and the cylinder head 5. The seals 10 are designed so that they are short and wide when not installed and are compressed somewhat by the installation and thus elongated. This allows a very good fit to be achieved.
Die Dichtungen 10 sind dabei aus einem gut wärmeleitfähigen Material wie z. B. einer .Metallfolie mit amorpher Struktur gefertigt, wodurch eine sehr glatte Oberfläche mit dem Vorteil einer einfachen und beschädigungsfreien Montage erzielt werden kann. Durch die verschiedenen Querschnittsformen ausgebildete Hohlräume 16 zwischen dem Brennstoffeinspritzventil 1 und der Dichtung 10 können zur Durchleitung einen Kühlmittels genutzt werden.The seals 10 are made of a highly thermally conductive material such. B. a .Metal foil with an amorphous structure, whereby a very smooth surface with the advantage of a simple and damage-free assembly can be achieved. Due to the different cross-sectional shapes, cavities 16 between the fuel injection valve 1 and the seal 10 can be used for the passage of a coolant.
Im folgenden werden Ausführungsbeispiele für mit entsprechenden Dichtungen 10 ausgestattete Brennstoffeinspritzventile 1 beispielhaft beschrieben. Die Brennstoffeinspritzventile 1 können dabei mit Ausnahme der erfindungsgemäßen Maßnahmen ähnlich wie das in Fig. 1 dargestellte Brennstoffeinspritzventil 1 ausgestaltet sein.Exemplary embodiments of fuel injection valves 1 equipped with corresponding seals 10 are described below by way of example. With the exception of the measures according to the invention, the fuel injection valves 1 can be configured similarly to the fuel injection valve 1 shown in FIG. 1.
Fig. 2 zeigt ein erstes Ausführungsbeispiel eines erfindungsgemäß ausgestalteten Brennstoffeinspritzventils 1. Die Dichtung 10 ist hier in einfachster Weise wellrohrförmig ausgestaltet. Die Dichtung 10 ist dabei an beiden Enden offen und kann dadurch besonders einfach montiert werden. Die Dichtung 10 kann an dem Düsenkörper 3 des Brennstoffeinspritzventils 1 vormontiert und dann mit diesem gemeinsam in den Zylinderkopf 5 eingesetzt werden.FIG. 2 shows a first exemplary embodiment of a fuel injector 1 designed according to the invention. The seal 10 is designed in the simplest manner in the form of a corrugated tube. The seal 10 is open at both ends and can therefore be installed particularly easily. The seal 10 can be preassembled on the nozzle body 3 of the fuel injection valve 1 and then used together with the latter in the cylinder head 5.
Fig. 3 zeigt ein zweites Ausführungsbeispiel eines erfindungsgemäß ausgestalteten Brennstoffeinspritzventils 1. Die Dichtung 10 ist in diesem Ausführungsbeispiel in Form einer rohrförmigen Dichtung 10 mit Ausstülpungen 11 ausgebildet. Die Ausstülpungen 11 sind im Schnitt dabei etwa halbkreisförmig. Vorteil dieser Variante ist eine etwas größere Anlagefläche am Düsenkörper 3 mit einer verbesserten Wärmeleitfähigkeit .3 shows a second exemplary embodiment of a fuel injection valve 1 designed according to the invention. In this exemplary embodiment, the seal 10 is designed in the form of a tubular seal 10 with protuberances 11. The protuberances 11 are approximately semi-circular in section. The advantage of this variant is a somewhat larger contact surface on the nozzle body 3 with an improved thermal conductivity.
Fig. 4 zeigt ein drittes Ausführungsbeispiel eines erfindungsgemäß ausgestalteten Brennstoffeinspritzventils 1. Die Dichtung 10 ist in diesem Fall gefältelt ausgeführt und zu einem Faltenbalg 10 geformt. Die Wärmeleitfähigkeit und Dichtfähigkeit entspricht etwa dem in Fig. 2 beschriebenen ersten Ausführungsbeispiel.4 shows a third exemplary embodiment of a fuel injection valve 1 designed according to the invention. In this case, the seal 10 is designed to be pleated and shaped into a bellows 10. The thermal conductivity and sealing ability correspond approximately to the first exemplary embodiment described in FIG. 2.
Fig. 5 zeigt ein viertes Ausführungsbeispiel eines erfindungsgemäß ausgestalteten Brennstoffeinspritzventils 1. Hier ist die Dichtung 10 im Sandwichverfahren aus mehreren Schichten 12 aufgebaut. Dies erhöht insbesondere die Haltbarkeit der Dichtung 10, welche sich bei der Montage nicht so leicht verziehen kann und daher weniger beschädigungsanfällig ist. Die einzelnen Schichten 12 können wiederum jeweils wellrohrförmig ausgeführt und miteinander verklebt oder nur an ihren Enden miteinander verbunden sein.5 shows a fourth exemplary embodiment of a fuel injection valve 1 designed according to the invention. Here, the seal 10 is constructed from several layers 12 in a sandwich process. This increases in particular the durability of the seal 10, which cannot warp so easily during assembly and is therefore less susceptible to damage. The individual layers 12 can in turn each have a corrugated tube shape and be glued to one another or only connected to one another at their ends.
In Fig. 6 ist ein fünftes Ausführungsbeispiel eines erfindungsgemäß ausgestalteten Brennstoffeinspritzventils 1 dargestellt. Die Dichtung 10 kann hier im Schnitt wie die6 shows a fifth exemplary embodiment of a fuel injector 1 designed according to the invention. The seal 10 can here in section like that
Dichtungen 10 gemäß den in den Fig. 2 bis 5 dargestelltenSeals 10 according to those shown in FIGS. 2 to 5
Ausführungsbeispielen gestaltet sein, wobei in Fig. 6 dieEmbodiments can be designed, wherein in Fig. 6
Wellrohrform gewählt wurde, und ist zusätzlich an einem abströmseitigen Ende 13 mit einem Abdeckblech 14 versehen, welches eine Öffnung 15 für die aus zumindest einerCorrugated tube shape was selected, and is additionally provided at a downstream end 13 with a cover plate 14, which has an opening 15 for at least one
Abspritzöffnung des Brennstoffeinspritzventils 1 in denSpray opening of the fuel injector 1 in the
Brennraum 2 eingespritzten Brennstoffstrahlen aufweist. DasCombustion chamber 2 has injected fuel jets. The
Abdeckblech 14 hat dabei zusätzlich die Funktion eines Hitzeschildes und schützt die Abspritzöffnungen vor der imCover plate 14 also has the function of a heat shield and protects the spray openings from the im
Brennraum herrschenden hohen Temperatur, welche dieCombustion chamber prevailing high temperature, which the
Verkokungsneigung derselben verstärkt.The tendency to coke increases.
In Fig. 7 ist ein sechstes Ausführungsbeispiel eines erfindungsgemäß ausgestalteten Brennstoffeinspritzventils 1 dargestellt. Die Dichtung 10 kann hier wie in dem in Fig. 6 dargestellten Ausführungsbeispiel im Schnitt wie die7 shows a sixth exemplary embodiment of a fuel injection valve 1 designed according to the invention. The seal 10 can here as in the embodiment shown in Fig. 6 in section like that
Dichtungen 10 gemäß den in den Fig. 2 bis 5 dargestelltenSeals 10 according to those shown in FIGS. 2 to 5
Ausführungsbeispielen gestaltet sein, wobei in Fig. 7 ebenfalls die Wellrohrform gewählt wurde. Die Dichtung 10 ist ebenfalls an einem abströmseitigen Ende 13 mit einemEmbodiments can be designed, the corrugated tube shape was also selected in Fig. 7. The seal 10 is also at an outflow end 13 with a
Abdeckblech 14 versehen, in welches die Abspritzöffnungen direkt eingearbeitet sein können. Das Abdeckblech 14 nimmt dabei ebenfalls die Funktion eines Hitzeschildes wahr und schützt das abströmseitige Ende desProvide cover plate 14, in which the spray openings can be incorporated directly. The cover plate 14 also performs the function of a heat shield and protects the downstream end of the
Brennstoffeinspritzventils 1 vor der im Brennraum herrschenden Temperatur. Die Erfindung ist nicht auf die dargestellten Ausführungsbeispiele beschränkt und auch für andere Querschnittsformen von Dichtungen 10 sowie für beliebige Bauweisen von Brennstoffeinspritzventilen 1, beispielsweise für Brennstoffeinspritzventile 1 mit Anbindung an ein Saugrohr oder ein Common-Rail-System, anwendbar. Insbesondere sind die einzelnen Merkmale der unterschiedlichen Ausführungsbeispiele beliebig miteinander kombinierbar. Fuel injector 1 before the temperature prevailing in the combustion chamber. The invention is not limited to the exemplary embodiments shown and can also be used for other cross-sectional shapes of seals 10 and for any construction of fuel injection valves 1, for example for fuel injection valves 1 with a connection to an intake manifold or a common rail system. In particular, the individual features of the different exemplary embodiments can be combined with one another as desired.

Claims

Ansprüche Expectations
1. Brennstoffeinspritzventil (1), insbesondere zum direkten Einspritzen von Brennstoff in den Brennraum einer gemischverdichtenden, fremdgezündeten Brennkraftmaschine, mit einem einen Düsenkörper (3) umfassenden Ventilgehäuse und einer Dichtung {10) , die das Brennstoffeinspritzventil (1) gegen einen Zylinderkopf (5) der Brennkraftmaschine abdichtet, dadurch gekennzeichnet, daß die Dichtung (10) hülsenförmig mit einem strukturierten Querschnitt ausgebildet ist und sich über die axiale Länge des Düsenkörpers (3) erstreckt.1. Fuel injection valve (1), in particular for injecting fuel directly into the combustion chamber of a mixture-compressing, spark-ignition internal combustion engine, with a valve housing comprising a nozzle body (3) and a seal {10) which presses the fuel injection valve (1) against a cylinder head (5) seals the internal combustion engine, characterized in that the seal (10) is sleeve-shaped with a structured cross section and extends over the axial length of the nozzle body (3).
2. Brennstoffeinspritzventil nach Anspruch 1, dadurch gekennzeichnet, daß. die Dichtung (10) wellrohrförmig ausgebildet ist.2. Fuel injection valve according to claim 1, characterized in that. the seal (10) is corrugated.
3. Brennstoffeinspritzventil nach Anspruch 1, dadurch gekennzeichnet, daß die Dichtung (10) rohrförmig mit Ausstülpungen (11) ausgebildet ist.3. Fuel injection valve according to claim 1, characterized in that the seal (10) is tubular with protuberances (11).
4. Brennstoffeinspritzventil nach Anspruch 3, dadurch gekennzeichnet, daß die Ausstülpungen (11) einen halbrunden Querschnitt aufweisen. 4. Fuel injection valve according to claim 3, characterized in that the protuberances (11) have a semicircular cross section.
5. Brennstoffeinspritzventil nach Anspruch 1, dadurch gekennzeichnet, daß die Dichtung (10) faltenbalgförmig gefältelt ist.5. Fuel injection valve according to claim 1, characterized in that the seal (10) is pleated in the shape of a bellows.
6. Brennstoffeinspritzventil nach Anspruch 1, dadurch gekennzeichnet, daß die Dichtung (10) aus mehreren Schichten (12) aufgebaut ist.6. Fuel injection valve according to claim 1, characterized in that the seal (10) is constructed from a plurality of layers (12).
7. Brennstoffeinspritzventil nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß die Dichtung (10) an einem abströmseitigen Ende (13) ein Abdeckblech (14) aufweist.7. Fuel injection valve according to one of claims 1 to 6, characterized in that the seal (10) at a downstream end (13) has a cover plate (14).
8. Brennstoffeinspritzventil nach Anspruch 7, dadurch gekennzeichnet, daß das Abdeckblech (14) eine Öffnung (15) aufweist.8. Fuel injection valve according to claim 7, characterized in that the cover plate (14) has an opening (15).
9. Brennstoffeinspritzventil nach Anspruch 8, dadurch gekennzeichnet, daß die Öffnung (15) als Durchtritt für in den Brennraum eingespritzte Brennstoffstrahlen dient.9. Fuel injection valve according to claim 8, characterized in that the opening (15) serves as a passage for fuel jets injected into the combustion chamber.
10. Brennstoffeinspritzventil nach Anspruch 7, dadurch gekennzeichnet, daß das Abdeckblech (14) mit mehreren Abspritzöffnungen versehen ist.10. Fuel injection valve according to claim 7, characterized in that the cover plate (14) is provided with a plurality of spray openings.
11. Brennstoffeinspritzventil nach einem der Ansprüche 1 bis 10, dadurch gekennzeichnet, daß die Dichtung (10) aus einer Metallfolie mit amorpher Struktur und glatter Oberfläche hergestellt ist.11. Fuel injection valve according to one of claims 1 to 10, characterized in that the seal (10) is made of a metal foil with an amorphous structure and a smooth surface.
12. Brennstoffeinspritzventil nach einem der Ansprüche 1 bis 11, dadurch gekennzeichnet, daß zwischen der Dichtung (10) und dem Düsenkörper (3) und/oder zwischen der Dichtung (10) und dem Zylinderkopf (5) gebildete Hohlräume (16) von einer Kühlflüssigkeit durchströmt sind. 12. Fuel injection valve according to one of claims 1 to 11, characterized in that between the seal (10) and the nozzle body (3) and / or between the seal (10) and the cylinder head (5) cavities (16) through which a cooling liquid flows.
EP04766521A 2003-08-18 2004-08-18 Fuel injection valve Expired - Lifetime EP1658428B8 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10337892A DE10337892A1 (en) 2003-08-18 2003-08-18 Fuel injector
PCT/EP2004/051820 WO2005019640A1 (en) 2003-08-18 2004-08-18 Fuel injection valve

Publications (3)

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EP1658428A1 EP1658428A1 (en) 2006-05-24
EP1658428B1 EP1658428B1 (en) 2007-11-14
EP1658428B8 true EP1658428B8 (en) 2008-01-23

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EP (1) EP1658428B8 (en)
JP (1) JP4537398B2 (en)
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WO (1) WO2005019640A1 (en)

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US7261089B2 (en) 2007-08-28
DE502004005519D1 (en) 2007-12-27
JP4537398B2 (en) 2010-09-01
EP1658428A1 (en) 2006-05-24
EP1658428B1 (en) 2007-11-14
WO2005019640A1 (en) 2005-03-03
JP2007502931A (en) 2007-02-15
US20070000480A1 (en) 2007-01-04
DE10337892A1 (en) 2005-03-17

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