EP1432909B1 - Fuel-injection valve - Google Patents

Fuel-injection valve Download PDF

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Publication number
EP1432909B1
EP1432909B1 EP02776762A EP02776762A EP1432909B1 EP 1432909 B1 EP1432909 B1 EP 1432909B1 EP 02776762 A EP02776762 A EP 02776762A EP 02776762 A EP02776762 A EP 02776762A EP 1432909 B1 EP1432909 B1 EP 1432909B1
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EP
European Patent Office
Prior art keywords
needle
valve
fuel
fuel injection
injection
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
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EP02776762A
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German (de)
French (fr)
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EP1432909A1 (en
Inventor
Grit KRÜGER
Andrej Astachow
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Siemens AG
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Siemens AG
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Publication of EP1432909A1 publication Critical patent/EP1432909A1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • F02M61/1806—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for characterised by the arrangement of discharge orifices, e.g. orientation or size

Definitions

  • the invention relates to a fuel injection valve for Internal combustion engines, in particular for those with direct injection.
  • valve needle In conventional fuel injectors for injection systems of internal combustion engines, the control of the fuel injection takes place typically by means of a valve needle, which in sealingly guided a valve body of an injection valve and slidably disposed.
  • the valve needle points to her Tip a valve pin seat that fits together with one Valve body seat of the valve body at least one nozzle opening to the combustion chamber of the internal combustion engine opens or closes.
  • the at least one nozzle opening is typically arranged in the region of the valve body seat.
  • the injector has the task to the combustion chamber of the Internal combustion engine selectively and metered to supply fuel.
  • the type of fuel treatment is determined by the Injector and the course of the injection process essential affected. This in turn can burn the Significantly affect internal combustion engine.
  • closed Injector when the cone of the nozzle needle on the conical Sealing surface of the nozzle body rests, is the nozzle needle centered in the nozzle body by this system.
  • lifting the Nozzle needle from the conical sealing surface then tends to free
  • the tip of the nozzle body projecting nozzle needle to to deviate from the exact centered position. This has to Result that the circumferential injection holes are not even be released, which in turn becomes an unbalanced Beam formation can lead to the combustion process and so that emissions can also be adversely affected.
  • Document JP 2000 265 927 discloses a fuel injection valve with injection holes and a valve needle, the needle tip has a plurality of groove-shaped recesses.
  • An object of the invention is a fuel injector to provide that at minimum Schadvolumen a uniform as possible spray pattern of the injection holes allows.
  • a fuel injection valve is used for injection of fuel into the Combustion chamber of an internal combustion engine proposed that a Valve body with a tip with injection holes and a Valve needle which is arranged axially movable in the valve body is.
  • a cone on the needle tip of the valve needle selectively gives a fuel path to the injection holes free and lock him up.
  • the Needle tip of the valve needle each one injection hole having associated, groove-shaped recess.
  • this fuel injection valve according to the invention can that for a favorable steering of the flow under the needle seat necessary volumes are kept to a minimum. This is achieved by using a circular instead of a circular one Groove around the needle tip only narrow grooves in the needle tip are introduced.
  • each recess has a width that is at least corresponds to a diameter of an injection hole. In this way, the damage volume can be reduced to a minimum be, while still providing optimal flow deflection ensured in the direction of the spray area.
  • the recesses can each have an arcuate or curved contour.
  • a Such arcuate or curved contour can be easily Insert manner in the manufacturing process of the nozzle needle.
  • an embodiment may provide that the recesses each have a semicircular cross-section exhibit.
  • the nozzle needle has a longitudinal guide to prevent of rotational movements, so that at any time the alignment the groove opposite the respective entry into Spray hole is guaranteed.
  • a longitudinal guide of Nozzle needle may preferably be formed by a tongue and groove guide be, so anytime a rotation of the nozzle needle is prevented during operation.
  • a further embodiment of the invention may provide that each injection hole gets a specially adapted groove, which causes unbalanced flow conditions due to compensate for needle deflections.
  • the invention consists in the solution of two counteracting one another Problems.
  • For flow optimization is an additional Volume in front of the entry edges of the injection holes created an injection nozzle, wherein at the same time Damage volume in the blind hole of the nozzle is minimized.
  • a fixation allows the needle relative to the nozzle body during assembly to realize the advantages of both aspects.
  • FIG. 1 shows a fuel injection valve according to the invention in a schematic sectional view.
  • the fuel injector 2 consists of a valve body 4 and a valve needle 6, with a needle guide 10 in the valve body 4 tight is guided.
  • a blind hole 16 of the valve body 4 is a or a plurality of injection holes 20 are provided.
  • the valve needle 6 has a needle tip 8 with a seat edge 18 and a valve needle seat 22. This valve needle seat 22 sits on a valve body seat 24 and thus seals the Injector 2 with the injection holes 20 from.
  • the fuel passes through a fuel inlet 30 and a between the valve needle 6 and the valve body 4 lying annular pressure chamber 26 to the seat edge 18 and raised Valve needle 6 along the annular space 32 between the valve needle 6 and valve body shaft on the blind hole 16th and the injection holes 20 in the combustion chamber of the internal combustion engine.
  • valve needle seat 22 and valve body seat 24 The embodiment of the needle tip 8 including valve needle seat 22 and valve body seat 24 is based on the figures 3 and 4 explained in more detail.
  • Figure 2 shows a plan view of the fuel injection valve 2 according to FIG Key 34, which fits into a corresponding groove in the upper area the needle guide 10 is fitted.
  • the feather key 34 engages in the correspondingly fitting guide groove 36 in the valve body. 4 a, so that an axial guidance of the valve needle 6 with low Game is guaranteed. In this way, each recess remains at the needle tip 8 each their associated injection hole 20 assigned.
  • FIG. 3 shows an enlarged detail of the needle point 8 of the fuel injection valve 2 according to FIG. 1.
  • the valve needle 6 has at its needle syringe 8 a first cone portion 42 with a first cone angle, in a second cone portion 44 with a slightly blunt cone angle as the first cone section 42 passes.
  • the second cone portion 44 is flattened and bounded by a round end face 40.
  • the transition between first cone portion 42 and second cone portion 44 at the same time represents a seat edge 18, which is a valve needle seat 22 forms.
  • This valve needle seat 22 is closed Valve needle 6 on the valve body seat 24 of the valve body tip on.
  • At the lower tip of the valve body a plurality of injection holes 20 are provided, in the illustrated embodiment six in number (see Figure 4).
  • each associated with an injection hole 20 are and each approximately the same width as one Injection hole 20 have.
  • the groove-shaped recesses 38 each have a triangular cross-section, wherein a lower edge of the recess 38 each about on the same height as a lower edge of an injection hole 20th lies. The upper edge of each recess is closer to the first Cone portion 42, so that approximates a fuel flow twist-free can run inside the groove and in the direction the injection hole 20 is directed.
  • a blind hole 16 in the valve body tip It has a very small space and is closed Valve needle 6 leaves, so that only a small Damage volume in the fuel injection valve 2 according to the invention is formed.
  • FIG. 4 shows a plan view from below of FIG Needle tip 8 corresponding to FIG. 3.
  • the star-shaped are recognizable symmetrically arranged injection holes 20, each of which on the same longitudinal axis a recess 38 in the second Cone portion 44 of the needle tip 8 is assigned.
  • the recesses 38 each have an individual contour. In this way, unbalanced spray patterns of the Fuel injection valve 2 due to example one not centrally guided or laterally deflected valve needle 6 be balanced. Preferably, such asymmetrical spray patterns are determined in experiments and considered in the formation of the recesses 38 accordingly become.

Description

Die Erfindung betrifft ein Kraftstoffeinspritzventil für Brennkraftmaschinen, insbesondere für solche mit Direkteinspritzung.The invention relates to a fuel injection valve for Internal combustion engines, in particular for those with direct injection.

Bei herkömmlichen Kraftstoffinjektoren für Einspritzanlagen von Brennkraftmaschinen erfolgt die Steuerung der Kraftstoffeinspritzung typischerweise mittels einer Ventilnadel, die in einem Ventilkörper eines Einspritzventils dichtend geführt und verschiebbar angeordnet ist. Die Ventilnadel weist an ihrer Spitze einen Ventilnadelsitz auf, der zusammen mit einem Ventilkörpersitz des Ventilkörpers wenigstens eine Düsenöffnung zum Brennraum der Brennkraftmaschine öffnet oder schließt. Die wenigstens eine Düsenöffnung ist typischerweise im Bereich des Ventilkörpersitzes angeordnet.In conventional fuel injectors for injection systems of internal combustion engines, the control of the fuel injection takes place typically by means of a valve needle, which in sealingly guided a valve body of an injection valve and slidably disposed. The valve needle points to her Tip a valve pin seat that fits together with one Valve body seat of the valve body at least one nozzle opening to the combustion chamber of the internal combustion engine opens or closes. The at least one nozzle opening is typically arranged in the region of the valve body seat.

Der Einspritzdüse kommt die Aufgabe zu, den Brennraum der Brennkraftmaschine gezielt und dosiert mit Kraftstoff zu versorgen. Die Art der Kraftstoffaufbereitung wird durch die Einspritzdüse und den Verlauf des Einspritzvorganges wesentlich beeinflusst. Dieser wiederum kann die Verbrennung der Brennkraftmaschine wesentlich beeinflussen. Bei geschlossener Einspritzdüse, wenn der Konus der Düsennadel an der konischen Dichtfläche des Düsenkörpers anliegt, ist die Düsennadel durch diese Anlage im Düsenkörper zentriert. Beim Abheben der Düsennadel von der konischen Dichtfläche neigt die dann frei in die Spitze des Düsenkörpers ragende Düsennadel jedoch dazu, von der exakt zentrierten Lage abzuweichen. Dies hat zur Folge, dass die umlaufenden Einspritzlöcher nicht gleichmäßig freigegeben werden, was wiederum zu einer unsymmetrischen Strahlausbildung führen kann, die den Verbrennungsverlauf und damit auch die Emissionswerte negativ zu beeinflussen vermag.The injector has the task to the combustion chamber of the Internal combustion engine selectively and metered to supply fuel. The type of fuel treatment is determined by the Injector and the course of the injection process essential affected. This in turn can burn the Significantly affect internal combustion engine. When closed Injector, when the cone of the nozzle needle on the conical Sealing surface of the nozzle body rests, is the nozzle needle centered in the nozzle body by this system. When lifting the Nozzle needle from the conical sealing surface then tends to free However, in the tip of the nozzle body projecting nozzle needle to to deviate from the exact centered position. This has to Result that the circumferential injection holes are not even be released, which in turn becomes an unbalanced Beam formation can lead to the combustion process and so that emissions can also be adversely affected.

Dokument JP 2000 265 927 offenbart ein Kraftstoffeinspritzventil mit Einspritzlöchern und einer Ventilnadel, wobei die Nadelspitze mehrere nutförmige Aussparungen aufweist. Document JP 2000 265 927 discloses a fuel injection valve with injection holes and a valve needle, the needle tip has a plurality of groove-shaped recesses.

Um ein gleichmäßiges Strahlbild der verschiedenen Einspritzlöcher zu gewährleisten, wird in der DE 198 43 616 A1 vorgeschlagen, den Düsenkörper der Einspritzdüse im Bereich der Einspritzlöcher mit einer zylinderförmigen Aussparung im Innenraum der Spitze vorzusehen. Mit Hilfe der Nut wird die Strömung in die Lage versetzt, die Geometrie im Nadelsitz mit möglichst geringen Strömungsverlusten zu umgehen. Allerdings entsteht durch das Einbringen der Nut ein zusätzliches sogenanntes Schadvolumen, d.h. ein Volumen zwischen Düsenkörper und Düsennadel, das sich für die Motorfunktion bzgl. Abgasemissionen schädlich auswirkt.For a uniform spray pattern of the various injection holes to ensure, is proposed in DE 198 43 616 A1, the nozzle body of the injection nozzle in the region of Injection holes with a cylindrical recess in the interior to provide the top. With the help of the groove is the Flow capable of using the geometry in the needle seat to avoid the lowest possible flow losses. Indeed created by the introduction of the groove an additional so-called Damage volume, i. a volume between nozzle body and nozzle needle, which is responsible for the engine function with respect to exhaust emissions detrimental.

Ein Ziel der Erfindung besteht darin, ein Kraftstoffeinspritzventil zur Verfügung zu stellen, das bei minimalem Schadvolumen ein möglichst gleichmäßiges Spritzbild der Einspritzlöcher ermöglicht.An object of the invention is a fuel injector to provide that at minimum Schadvolumen a uniform as possible spray pattern of the injection holes allows.

Dieses Ziel der Erfindung wird mit dem Gegenstand der unabhängigen Ansprüche erreicht. Merkmale vorteilhafter Weiterbildungen der Erfindung ergeben sich aus den abhängigen Ansprüchen.This object of the invention is with the subject matter of the independent Claims reached. Features of advantageous developments The invention will become apparent from the dependent claims.

Um dieses Ziel der Erfindung zu erreichen, wird ein Kraftstoffeinspritzventil zur Einspritzung von Kraftstoff in den Brennraum einer Brennkraftmaschine vorgeschlagen, das einen Ventilkörper mit einer Spitze mit Einspritzlöchern und eine Ventilnadel aufweist, die im Ventilkörper axial beweglich angeordnet ist. Ein Konus an der Nadelspitze der Ventilnadel gibt einen Kraftstoffweg zu den Einspritzlöchern selektiv frei und sperrt ihn. Erfindungsgemäß ist vorgesehen, dass die Nadelspitze der Ventilnadel jeweils eine jedem Einspritzloch zugeordnete, nutförmige Aussparung aufweist.To achieve this aim of the invention, a fuel injection valve is used for injection of fuel into the Combustion chamber of an internal combustion engine proposed that a Valve body with a tip with injection holes and a Valve needle which is arranged axially movable in the valve body is. A cone on the needle tip of the valve needle selectively gives a fuel path to the injection holes free and lock him up. According to the invention it is provided that the Needle tip of the valve needle each one injection hole having associated, groove-shaped recess.

Mit diesem erfindungsgemäßen Kraftstoffeinspritzventil kann das für eine günstige Lenkung der Strömung unter dem Nadelsitz notwendige Volumen auf ein Minimum reduziert werden. Dies wird dadurch erreicht, dass anstatt einer kreisförmigen Nut um die Nadelspitze lediglich schmale Nuten in der Nadelspitze eingebracht sind.With this fuel injection valve according to the invention can that for a favorable steering of the flow under the needle seat necessary volumes are kept to a minimum. This is achieved by using a circular instead of a circular one Groove around the needle tip only narrow grooves in the needle tip are introduced.

Bei einer Ausgestaltung des erfindungsgemäßen Kraftstoffeinspritzventils weist jede Aussparung eine Breite auf, die mindestens einen Durchmesser eines Einspritzlochs entspricht. Auf diese Weise kann das Schadvolumen auf ein Minimum reduziert werden, wobei dennoch eine optimale Strömungsumlenkung in Richtung der Spritzfläche gewährleistet bleibt.In one embodiment of the fuel injection valve according to the invention each recess has a width that is at least corresponds to a diameter of an injection hole. In this way, the damage volume can be reduced to a minimum be, while still providing optimal flow deflection ensured in the direction of the spray area.

Zur Vereinfachung der Fertigung können die Aussparungen jeweils eine bogenförmige oder gewölbte Kontur aufweisen. Eine solche bogenförmige bzw. gewölbte Kontur lässt sich auf einfache Weise beim Herstellungsvorgang der Düsennadel einbringen. So kann beispielsweise eine Ausführungsform vorsehen, dass die Aussparungen jeweils einen halbkreisförmigen Querschnitt aufweisen.To simplify manufacturing, the recesses can each have an arcuate or curved contour. A Such arcuate or curved contour can be easily Insert manner in the manufacturing process of the nozzle needle. For example, an embodiment may provide that the recesses each have a semicircular cross-section exhibit.

Vorzugsweise weist die Düsennadel eine Längsführung zur Verhinderung von Drehbewegungen auf, so dass jederzeit die Ausrichtung der Nut gegenüber dem jeweiligen Eintritt ins Spritzloch gewährleistet ist. Eine derartige Längsführung der Düsennadel kann vorzugsweise durch eine Nut-Feder-Führung gebildet werden, so dass jederzeit eine Rotation der Düsennadel während des Betriebs verhindert wird.Preferably, the nozzle needle has a longitudinal guide to prevent of rotational movements, so that at any time the alignment the groove opposite the respective entry into Spray hole is guaranteed. Such a longitudinal guide of Nozzle needle may preferably be formed by a tongue and groove guide be, so anytime a rotation of the nozzle needle is prevented during operation.

Eine weitere Ausführungsform der Erfindung kann vorsehen, dass jedes Einspritzloch eine speziell angepasste Nut bekommt, wodurch sich unsymmetrische Strömungsbedingungen infolge von Nadelauslenkungen kompensieren lassen.A further embodiment of the invention may provide that each injection hole gets a specially adapted groove, which causes unbalanced flow conditions due to compensate for needle deflections.

Die Erfindung besteht in der Lösung von zwei einander entgegenwirkenden Probleme. Zur Strömungsoptimierung wird ein zusätzliches Volumen vor den Eintrittskanten der Einspritzlöcher einer Einspritzdüse geschaffen, wobei gleichzeitig das Schadvolumen im Sackloch der Düse minimiert wird. Eine Fixierung der Nadel gegenüber dem Düsenkörper bei der Montage ermöglicht es, die Vorteile beider Aspekte zu verwirklichen.The invention consists in the solution of two counteracting one another Problems. For flow optimization is an additional Volume in front of the entry edges of the injection holes created an injection nozzle, wherein at the same time Damage volume in the blind hole of the nozzle is minimized. A fixation allows the needle relative to the nozzle body during assembly to realize the advantages of both aspects.

Die Erfindung wird nun anhand von Ausführungsformen mit Bezug auf die beiliegenden Figuren näher erläutert.

Figur 1
ein erfindungsgemäßes Kraftstoffeinspritzventil in schematischer Schnittansicht,
Figur 2
eine Draufsicht auf das Kraftstoffeinspritzventil gemäß Figur 1,
Figur 3
einen vergrößerten Ausschnitt der Nadelspitze des Ventils gemäß Figur 1 und
Figur 4
eine Draufsicht von unten auf die Nadelspitze entsprechend Figur 3.
The invention will now be explained in more detail by means of embodiments with reference to the accompanying figures.
FIG. 1
a fuel injection valve according to the invention in a schematic sectional view,
FIG. 2
a top view of the fuel injection valve according to Figure 1,
FIG. 3
an enlarged section of the needle tip of the valve according to Figure 1 and
FIG. 4
a top view from below of the needle tip according to Figure 3.

Figur 1 zeigt ein erfindungsgemäßes Kraftstoffeinspritzventil in schematischer Schnittansicht. Das Kraftstoffeinspritzventil 2 besteht aus einem Ventilkörper 4 und einer Ventilnadel 6, die mit einer Nadelführung 10 in dem Ventilkörper 4 dicht geführt ist. In einem Sackloch 16 des Ventilkörpers 4 ist eine bzw. sind mehrere Einspritzlöcher 20 vorgesehen. Die Ventilnadel 6 weist eine Nadelspitze 8 mit einer Sitzkante 18 und einem Ventilnadelsitz 22 auf. Dieser Ventilnadelsitz 22 sitzt auf einem Ventilkörpersitz 24 auf und dichtet somit das Einspritzventil 2 mit den Einspritzlöchern 20 ab.FIG. 1 shows a fuel injection valve according to the invention in a schematic sectional view. The fuel injector 2 consists of a valve body 4 and a valve needle 6, with a needle guide 10 in the valve body 4 tight is guided. In a blind hole 16 of the valve body 4 is a or a plurality of injection holes 20 are provided. The valve needle 6 has a needle tip 8 with a seat edge 18 and a valve needle seat 22. This valve needle seat 22 sits on a valve body seat 24 and thus seals the Injector 2 with the injection holes 20 from.

Der Kraftstoff gelangt über einen Kraftstoffzulauf 30 und einen zwischen der Ventilnadel 6 und dem Ventilkörper 4 liegenden ringförmigen Druckraum 26 zur Sitzkante 18 und bei angehobener Ventilnadel 6 entlang des Ringraums 32 zwischen Ventilnadel 6 und Ventilkörperschaft weiter über das Sackloch 16 und die Einspritzlöcher 20 in den Brennraum der Brennkraftmaschine. The fuel passes through a fuel inlet 30 and a between the valve needle 6 and the valve body 4 lying annular pressure chamber 26 to the seat edge 18 and raised Valve needle 6 along the annular space 32 between the valve needle 6 and valve body shaft on the blind hole 16th and the injection holes 20 in the combustion chamber of the internal combustion engine.

Zwischen einer zylindrisch geformten Nadelführung 10 im oberen Bereich der Ventilnadel 6, die gegenüber dem Nadelschaft im Durchmesser vergrößert ist, und einer Führungsfläche 12 im Ventilkörper 4, die eine zylindrische Innenmantelfläche aufweist, befindet sich ein Dichtspalt 14. Durch diesen Dichtspalt 14 nimmt der im Druckraum 26 herrschende Hochdruck gegenüber einem Leckagebereich oberhalb der Ventilnadel 6 kontinuierlich ab.Between a cylindrically shaped needle guide 10 in the upper Area of the valve needle 6, opposite the needle shaft is increased in diameter, and a guide surface 12 in the Valve body 4, which has a cylindrical inner circumferential surface, there is a sealing gap 14. Through this sealing gap 14 takes the prevailing in the pressure chamber 26 high pressure a leakage area above the valve needle 6 continuously from.

Mittels einer Passfeder 34 im oberen Bereich der Nadelführung 10, die in einer entsprechenden Führungsnut 36 in der Führungsfläche 12 des Ventilkörpers 4 geführt ist, wird jederzeit eine Rotation der Ventilnadel 6 verhindert. Auf diese Weise bleiben die Aussparungen 38 in der Nadelspitze ihren jeweils korrespondierenden Einspritzlöchern zugeordnet.By means of a feather key 34 in the upper region of the needle guide 10, in a corresponding guide groove 36 in the guide surface 12 of the valve body 4 is performed at any time prevents rotation of the valve needle 6. To this Way remain the recesses 38 in the needle tip her each associated with corresponding injection holes.

Die Ausgestaltung der Nadelspitze 8 inklusive Ventilnadelsitz 22 und Ventilkörpersitz 24 wird anhand der Figuren 3 und 4 näher erläutert.The embodiment of the needle tip 8 including valve needle seat 22 and valve body seat 24 is based on the figures 3 and 4 explained in more detail.

Figur 2 zeigt eine Draufsicht auf das Kraftstoffeinspritzventil 2 gemäß Figur 1. Erkennbar ist hierbei insbesondere die Passfeder 34, die in eine entsprechende Nut im oberen Bereich der Nadelführung 10 eingepasst ist. Die Passfeder 34 greift in die entsprechend passende Führungsnut 36 im Ventilkörper 4 ein, so dass eine axiale Führung der Ventilnadel 6 mit geringem Spiel gewährleistet ist. Auf diese Weise bleibt jede Aussparung an der Nadelspitze 8 jeweils ihrem zugehörigen Einspritzloch 20 zugeordnet.Figure 2 shows a plan view of the fuel injection valve 2 according to FIG Key 34, which fits into a corresponding groove in the upper area the needle guide 10 is fitted. The feather key 34 engages in the correspondingly fitting guide groove 36 in the valve body. 4 a, so that an axial guidance of the valve needle 6 with low Game is guaranteed. In this way, each recess remains at the needle tip 8 each their associated injection hole 20 assigned.

Figur 3 zeigt einen vergrößerten Ausschnitt der Nadelspitze 8 des Kraftstoffeinspritzventils 2 gemäß Figur 1. Die Ventilnadel 6 weist an ihrer Nadelspritze 8 einen ersten Kegelabschnitt 42 mit einem ersten Kegelwinkel auf, der in einen zweiten Kegelabschnitt 44 mit etwas stumpferen Kegelwinkel als der erste Kegelabschnitte 42 übergeht. Am Ende der Nadelspitze 8 ist der zweite Kegelabschnitt 44 abgeflacht und durch eine runde Stirnfläche 40 begrenzt. Der Übergang zwischen ersten Kegelabschnitt 42 und zweitem Kegelabschnitt 44 stellt gleichzeitig eine Sitzkante 18 dar, die einen Ventilnadelsitz 22 bildet. Dieser Ventilnadelsitz 22 liegt bei geschlossener Ventilnadel 6 am Ventilkörpersitz 24 der Ventilkörperspitze auf. An der unteren Spitze des Ventilkörpers sind mehrere Einspritzlöcher 20 vorgesehen, im gezeigten Ausführungsbeispiel sechs an der Zahl (vgl. Figur 4).FIG. 3 shows an enlarged detail of the needle point 8 of the fuel injection valve 2 according to FIG. 1. The valve needle 6 has at its needle syringe 8 a first cone portion 42 with a first cone angle, in a second cone portion 44 with a slightly blunt cone angle as the first cone section 42 passes. At the end of the needle point 8, the second cone portion 44 is flattened and bounded by a round end face 40. The transition between first cone portion 42 and second cone portion 44 at the same time represents a seat edge 18, which is a valve needle seat 22 forms. This valve needle seat 22 is closed Valve needle 6 on the valve body seat 24 of the valve body tip on. At the lower tip of the valve body a plurality of injection holes 20 are provided, in the illustrated embodiment six in number (see Figure 4).

Im zweiten Kegelabschnitt 44 sind nutförmige Aussparungen 38 vorgesehen, die jeweils einem Einspritzloch 20 zugeordnet sind und die jeweils annährend die gleiche Breite wie ein Einspritzloch 20 aufweisen. Die nutförmigen Aussparungen 38 weisen jeweils einen dreieckförmigen Querschnitt auf, wobei eine untere Kante der Aussparung 38 jeweils ungefähr auf gleicher Höhe wie eine untere Kante eines Einspritzlochs 20 liegt. Die obere Kante jeder Aussparung liegt näher zum ersten Kegelabschnitt 42, so dass eine Kraftstoffströmung annähernd drallfrei innerhalb der Nut verlaufen kann und in Richtung des Einspritzlochs 20 gelenkt wird.In the second cone portion 44 are groove-shaped recesses 38th provided, each associated with an injection hole 20 are and each approximately the same width as one Injection hole 20 have. The groove-shaped recesses 38 each have a triangular cross-section, wherein a lower edge of the recess 38 each about on the same height as a lower edge of an injection hole 20th lies. The upper edge of each recess is closer to the first Cone portion 42, so that approximates a fuel flow twist-free can run inside the groove and in the direction the injection hole 20 is directed.

Um die Stirnfläche 40 und die Spitze des zweiten Kegelabschnitts 44 ist ein Sackloch 16 in der Ventilkörperspitze ausgebildet, das einen nur sehr kleinen Raum bei geschlossener Ventilnadel 6 übrig lässt, so dass ein nur geringes Schadvolumen im erfindungsgemäßen Kraftstoffeinspritzventil 2 gebildet wird.To the end face 40 and the tip of the second cone portion 44 is a blind hole 16 in the valve body tip It has a very small space and is closed Valve needle 6 leaves, so that only a small Damage volume in the fuel injection valve 2 according to the invention is formed.

Figur 4 zeigt schließlich eine Draufsicht von unten auf die Nadelspitze 8 entsprechend Figur 3. Erkennbar sind die sternförmig symmetrisch angeordneten Einspritzlöcher 20, denen jeweils auf gleicher Längsachse eine Aussparung 38 im zweiten Kegelabschnitt 44 der Nadelspitze 8 zugeordnet ist.Finally, FIG. 4 shows a plan view from below of FIG Needle tip 8 corresponding to FIG. 3. The star-shaped are recognizable symmetrically arranged injection holes 20, each of which on the same longitudinal axis a recess 38 in the second Cone portion 44 of the needle tip 8 is assigned.

In einer weiteren bevorzugten Variante der Erfindung können die Aussparungen 38 jeweils eine individuelle Kontur aufweisen. Auf diese Weise können unsymmetrische Spritzbilder des Kraftstoffeinspritzventils 2 aufgrund beispielsweise einer nicht zentrisch geführten oder seitlich ausgelenkten Ventilnadel 6 ausgeglichen werden. Vorzugsweise können derartige unsymmetrische Spritzbilder in Versuchen ermittelt werden und bei der Ausbildung der Aussparungen 38 entsprechend berücksichtigt werden.In a further preferred variant of the invention the recesses 38 each have an individual contour. In this way, unbalanced spray patterns of the Fuel injection valve 2 due to example one not centrally guided or laterally deflected valve needle 6 be balanced. Preferably, such asymmetrical spray patterns are determined in experiments and considered in the formation of the recesses 38 accordingly become.

Claims (6)

1. Fuel injection valve (2) for injecting fuel into the combustion chamber of an internal combustion engine, comprising a valve body (4) having a tip containing injection orifices (20) and a valve needle (6) which is disposed in an axially displaceable manner in the valve body (4), a cone at the tip (8) of the valve needle (6) selectively releasing and blocking a fuel path to the injection orifices (20),
with which
a respective groove-shaped recess (38) in the tip (8) of the valve needle (6) is assigned to each individual injection orifice (20), characterized in that each recess (28) has a width which corresponds at least to one diameter of an injection orifice (20).
2. Fuel injection valve according to claim 1,
characterized in that
each of the recesses (38) has a stepped contour.
3. Fuel injection valve according to claim 3,
characterized in that
each of the recesses(38) has a curvilinear cross-section.
4. Fuel injection valve according to one of the claims 1 to 3,
characterized in that
the nozzle needle (6) has a longitudinal guide for preventing rotational movements.
5. Fuel injection valve according to claim 4,
characterized in that
the longitudinal guide is formed by means of a slot-and-key guide.
7. Fuel injection valve according to claim 4 or 5,
characterized in that
a featherkey (34) engages in a needle guide (10) of the valve needle (6) in a guide groove (36) in a hollow cylindrical guide surface (12) in the valve body (4).
EP02776762A 2001-10-05 2002-10-01 Fuel-injection valve Expired - Fee Related EP1432909B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10149277A DE10149277A1 (en) 2001-10-05 2001-10-05 Fuel injection valve, for an IC motor, has grooves at the conical tip of the valve needle matching the injection openings in the valve body
DE10149277 2001-10-05
PCT/DE2002/003725 WO2003031807A1 (en) 2001-10-05 2002-10-01 Fuel-injection valve

Publications (2)

Publication Number Publication Date
EP1432909A1 EP1432909A1 (en) 2004-06-30
EP1432909B1 true EP1432909B1 (en) 2005-12-21

Family

ID=7701584

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02776762A Expired - Fee Related EP1432909B1 (en) 2001-10-05 2002-10-01 Fuel-injection valve

Country Status (5)

Country Link
US (1) US7188790B2 (en)
EP (1) EP1432909B1 (en)
JP (1) JP2005504924A (en)
DE (2) DE10149277A1 (en)
WO (1) WO2003031807A1 (en)

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Also Published As

Publication number Publication date
WO2003031807A1 (en) 2003-04-17
DE50205375D1 (en) 2006-01-26
EP1432909A1 (en) 2004-06-30
DE10149277A1 (en) 2003-04-24
US20040195388A1 (en) 2004-10-07
US7188790B2 (en) 2007-03-13
JP2005504924A (en) 2005-02-17

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