EP1834080B1 - Fuel injection valve for internal combustion chambers - Google Patents

Fuel injection valve for internal combustion chambers Download PDF

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Publication number
EP1834080B1
EP1834080B1 EP05818956A EP05818956A EP1834080B1 EP 1834080 B1 EP1834080 B1 EP 1834080B1 EP 05818956 A EP05818956 A EP 05818956A EP 05818956 A EP05818956 A EP 05818956A EP 1834080 B1 EP1834080 B1 EP 1834080B1
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EP
European Patent Office
Prior art keywords
fuel injection
injection valve
knobs
fuel
injection
Prior art date
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Not-in-force
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EP05818956A
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German (de)
French (fr)
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EP1834080A1 (en
Inventor
Marco Reuter
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP1834080A1 publication Critical patent/EP1834080A1/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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • 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
    • F02M61/1846—Dimensional characteristics of discharge orifices
    • 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
    • F02M2200/06—Fuel-injection apparatus having means for preventing coking, e.g. of fuel injector discharge orifices or valve needles
    • 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
    • F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
    • F02M2200/8069—Fuel injection apparatus manufacture, repair or assembly involving removal of material from the fuel apparatus, e.g. by punching, hydro-erosion or mechanical operation
    • 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
    • F02M2200/90—Selection of particular materials
    • F02M2200/9038—Coatings

Definitions

  • Fuel injectors as are preferably used for direct injection and auto-ignition internal combustion engines are exposed at its injection-side end, which projects into the combustion chamber, high temperatures, such as those resulting from combustion. Remaining in or near the injection port fuel residues after injection, they may coke through the high temperatures during combustion, so that a corresponding coking layer can form in the injection port or in the region of the exit of the injection port. Over time, this coking layer leads to a narrowing of the injection opening and thus to a change in the injection characteristic and the injected quantity.
  • US 5058810 describes a fuel injection valve wherein the outlet opening is arranged on the outside of the housing.
  • the fuel injection valve according to the invention has the advantage that the injection openings of the fuel injection valve are reliably protected against coking.
  • the injection openings are provided with a plurality of nubs. These nubs are designed in size and shape so that the so-called lotus effect is formed, which reliably prevents an accumulation of material of various kinds.
  • possibly forming residues in the injection openings are removed by the passing fuel in the subsequent injections, so that an unchanged surface of the injection openings is permanently provided.
  • the knobs have a substantially conical shape, so that any depositing coking particles attach only to the tip of the conical nubs and thus only very low adhesion forces between the particles and the dimpled surface is formed. As a result, these particles are easily removed again by the passing fuel and can not accumulate permanently.
  • the nubs can either be the same or have different diameters and heights, which are then preferably stochastically distributed. The diameter of the nubs is preferably 1 to 10 .mu.m, wherein the height of the nubs is preferably in the same order of magnitude.
  • FIG. 1 is a longitudinal section through a fuel injection valve according to the invention shown schematically.
  • the fuel injection valve has a housing 1, which comprises a valve body 3.
  • a bore 5 is formed, which is bounded at its combustion-chamber end by a conical valve seat 8.
  • a valve needle 7 is arranged longitudinally displaceable, which is guided in a guide portion 107 in the bore 5.
  • the valve needle 7 tapers to form a pressure shoulder 12, merges into a shaft region 207 and finally ends at its valve seat facing end in a conical sealing surface 9.
  • a pressure chamber 11 is formed, which is filled via an inlet channel 17 with fuel at high pressure.
  • valve seat 8 a plurality of injection openings 15 are formed, which open into the combustion chamber of the internal combustion engine when the fuel injection valve is installed in a corresponding internal combustion engine.
  • the valve needle 7 cooperates with its sealing surface 9 with the valve seat 8 in such a way that upon contact of the valve needle 7 on the valve seat 8, the pressure chamber 11 is separated from the injection ports 15, while lifted from the valve seat 8 valve needle 7, a fuel flow from the Pressure chamber 11 takes place to the injection openings 15, is injected by the fuel into the combustion chamber of the internal combustion engine.
  • FIG. 2 shows an enlargement of FIG. 1 in the region of the valve seat 8, wherein the area in FIG. 1 denoted by II.
  • the enlarged illustrated injection port 15 has in its inside a plurality of nubs 20 which line the inside.
  • the knobs 20 can continue on the end face 103 of the valve body 3, especially in the area surrounding the outlet openings of the injection openings 15. But it can also be provided to provide the entire surface of the fuel injection valve, which projects into the combustion chamber, with nubs 20.
  • the surface of the injection port 15 gets dirt-repellent properties, which are known as the so-called lotus effect. Dirt or soot particles that deposit on this surface touch the surface only at the tip of the dimples 20, so that only very low adhesion forces between the dirt particle and the surface are present. The dirt or soot particles can then easily be entrained by the fuel flow which flows through the injection opening 15 during the injection, so that no deposits of such particles occur, and the injection opening 15 remains unchanged over the entire service life of the injection valve.
  • FIG. 3a shows the section of III designated by FIG. 2 in an enlarged view.
  • the nubs 20 here have a conical shape and have a diameter d, which is preferably in the range of 1 to 10 microns.
  • the height of the knobs 20 moves in the same order of magnitude, the knobs 20 are arranged very close and between the individual knobs 20 no or very little space is available.
  • FIG. 3b shows a further embodiment in which the studs 20 have a slightly different shape and are rounded.
  • the height of the individual knobs h 1 , h 2 may be different, so that, for example, a stochastic distribution of heights is given. Likewise, it may be provided to distribute the knobs 20 either evenly over the surface or stochastically to distribute, resulting in a non-uniform arrangement of pimples.
  • nubs can be done with different methods. For example, the coating with a corresponding material that forms such a knob-like structure when cured, or the treatment of the surface with a laser or with a sputtering process.
  • knobs in a rounded shape or in the form of cones, other shapes are conceivable such as, for example, pyramids or other tips, which are formed according to dense and small, to prevent the addition of soot and other dirt particles.

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

Abstract

The invention relates to a fuel injection valve for internal combustion chambers comprising a housing (1; 3) wherein at least one injection opening (15), through which the fuel can be injected into the combustion chamber of the internal combustion chamber, is embodied. The inner side of the at least one injection opening (15) and/or the external side of the housing (1) are provided with knobs (20) in the region of the outlet of the at least one injection opening (15), such that an attachment, in particular of coking particles, is no longer possible or is at least made visibly more difficult.

Description

Stand der TechnikState of the art

Kraftstoffeinspritzventile, wie Sie vorzugsweise für direkteinspritzende und selbstzündende Brennkraftmaschinen verwendet werden, sind an ihrem einspritzseitigen Ende, das in den Brennraum hineinragt, hohen Temperaturen ausgesetzt, wie sie bei der Verbrennung entstehen. Verbleiben in oder im Bereich der Einspritzöffnung Kraftstoffrückstände nach der Einspritzung, so können diese durch die hohen Temperaturen während der Verbrennung verkoken, sodass sich eine entsprechende Verkokungsschicht in der Einspritzöffnung oder im Bereich des Austritts der Einspritzöffnung bilden kann. Diese Verkokungsschicht führt mit der Zeit zu einer Verengung des Einspritzöffnung und damit zu einer Veränderung der Einspritzcharakteristik und der eingespritzten Menge.Fuel injectors, as are preferably used for direct injection and auto-ignition internal combustion engines are exposed at its injection-side end, which projects into the combustion chamber, high temperatures, such as those resulting from combustion. Remaining in or near the injection port fuel residues after injection, they may coke through the high temperatures during combustion, so that a corresponding coking layer can form in the injection port or in the region of the exit of the injection port. Over time, this coking layer leads to a narrowing of the injection opening and thus to a change in the injection characteristic and the injected quantity.

Aus der Offenlegungsschrift DE 10 2004 020 175 ist bekannt, die Einspritzöffnungen mit einer Beschichtung zu versehen, die die Anlagerung einer Verkokungsschicht verhindern soll. Solche Beschichtungen bieten jedoch nicht immer einen ausreichenden Schutz vor Verkokung und weisen darüber hinaus den Nachteil auf, dass sie von der entsprechenden Oberfläche abplatzen können, was insbesondere im Bereich der Einspritzöffnungen vorkommen kann, wo durch die sehr hohen hydraulischen Drücke entsprechend hohe mechanische Kräfte auftreten.From the publication DE 10 2004 020 175 It is known to provide the injection openings with a coating which is intended to prevent the deposition of a coking layer. However, such coatings do not always provide adequate protection against coking and also have the disadvantage that they can flake off the corresponding surface, which may occur in particular in the injection orifices where correspondingly high mechanical forces occur due to the very high hydraulic pressures.

US 5058810 beschreibt ein Kraftstoffeinspritzventil wobei die Austrittsöffnung an der Außenseite des Gehäuses angeordnet ist. US 5058810 describes a fuel injection valve wherein the outlet opening is arranged on the outside of the housing.

Weiter ist aus der Offenlegungsschrift DE 42 00 709 A1 bekannt, die Einspritzöffnungen mit Abrisskanten zu versehen, die quer zur Strömungsrichtung in der Wand der Einspritzöffnungen verlaufen. Solche Abrisskanten bewirken eine bessere Zerstäubung des Kraftstoffs, sind jedoch nicht geeignet, eine Anlagerung von Verkokungsmaterial in diesem Bereich zu verhindern.Next is from the published patent application DE 42 00 709 A1 known to provide the injection openings with tear-off edges which extend transversely to the flow direction in the wall of the injection openings. Such demolition edges cause a better Atomization of the fuel, but are not suitable to prevent accumulation of coking material in this area.

Vorteile der ErfindungAdvantages of the invention

Das erfindungsgemäße Kraftstoffeinspritzventil weist demgegenüber den Vorteil auf, dass die Einspritzöffnungen des Kraftstoffeinspritzventils zuverlässig vor Verkokung geschützt werden. Hierzu sind die Einspritzöffnungen mit einer Vielzahl von Noppen versehen. Diese Noppen sind in Größe und Gestalt so ausgebildet, dass sich der so genannte Lotuseffekt ausbildet, der eine Anlagerung von Material verschiedenster Art zuverlässig verhindert. Sich evtl. doch bildende Rückstände in den Einspritzöfnungen werden durch den vorbeifließenden Kraftstoff bei den nachfolgenden Einspritzungen abgetragen, sodass dauerhaft eine unveränderte Oberfläche der Einspritzöffnungen gegeben ist.In contrast, the fuel injection valve according to the invention has the advantage that the injection openings of the fuel injection valve are reliably protected against coking. For this purpose, the injection openings are provided with a plurality of nubs. These nubs are designed in size and shape so that the so-called lotus effect is formed, which reliably prevents an accumulation of material of various kinds. However, possibly forming residues in the injection openings are removed by the passing fuel in the subsequent injections, so that an unchanged surface of the injection openings is permanently provided.

Durch die abhängigen Ansprüche sind vorteilhafte Ausgestaltungen des Gegenstandes der Erfindung möglich. In einer ersten vorteilhaften Ausgestaltung weisen die Noppen eine im wesentlichen kegelförmige Gestalt auf, sodass sich gegebenenfalls ablagernde Verkokungspartikel nur auf der Spitze der kegelförmigen Noppen ansetzten und damit nur sehr geringe Adhäsionskräfte zwischen den Partikeln und der genoppten Oberfläche entsteht. Dadurch werden diese Partikel leicht wieder durch den vorbeifließenden Kraftstoff abgetragen und können sich nicht dauerhaft anlagern. Hierbei können die Noppen entweder sämtlich gleich ausgebildet sein oder auch unterschiedliche Durchmesser und Höhen aufweisen, die dann vorzugsweise stochastisch verteilt sind. Der Durchmesser der Noppen beträgt vorzugsweise 1 bis 10 µm, wobei die Höhe der Noppen vorzugsweise in der gleichen Größenordnung liegt.By the dependent claims advantageous embodiments of the subject invention are possible. In a first advantageous embodiment, the knobs have a substantially conical shape, so that any depositing coking particles attach only to the tip of the conical nubs and thus only very low adhesion forces between the particles and the dimpled surface is formed. As a result, these particles are easily removed again by the passing fuel and can not accumulate permanently. In this case, the nubs can either be the same or have different diameters and heights, which are then preferably stochastically distributed. The diameter of the nubs is preferably 1 to 10 .mu.m, wherein the height of the nubs is preferably in the same order of magnitude.

Zeichnungdrawing

In der Zeichnung ist ein Ausführungsbeispiel des erfindungsgemäßen Kraftstoffeinspritzventils dargestellt. Es zeigt

Figur 1
einen Längsschnitt durch ein erfindungsgemäßes Kraftstoff- einspritzventil,
Figur 2
eine Vergrößerung des mit II bezeichneten Ausschnitts im Bereich einer Einspritzöffnung,
Figur 3a
und
Figur 3b
eine Vergrößerung des mit III bezeichneten Ausschnitts von Figur II, wobei Figur 3a und 3b unterschiedliche Ausgestal- tungen der Noppen zeigen.
In the drawing, an embodiment of the fuel injection valve according to the invention is shown. It shows
FIG. 1
a longitudinal section through a fuel injection valve according to the invention,
FIG. 2
an enlargement of the section marked II in the region of an injection opening,
FIG. 3a
and
FIG. 3b
an enlargement of the designated III section of Figure II, wherein Figure 3a and 3b show different designs of nubs.

Beschreibung des AusführungsbeispielsDescription of the embodiment

In Figur 1 ist ein Längsschnitt durch ein erfindungsgemäßes Kraftstoffeinspritzventil schematisch dargestellt. Das Kraftstoffeinspritzventil weist ein Gehäuse 1 auf, das einen Ventilkörper 3 umfasst. Im Ventilkörper 3 ist eine Bohrung 5 ausgebildet, die an ihrem brennraumseitigen Ende von einem konischen Ventilsitz 8 begrenzt wird. In der Bohrung 5 ist eine Ventilnadel 7 längsverschiebbar angeordnet, die in einem Führungsbereich 107 in der Bohrung 5 geführt ist. Ausgehend vom Führungsbereich 107 verjüngt sich die Ventilnadel 7 unter Bildung einer Druckschulter 12, geht in einen Schaftbereich 207 über und endet schließlich an ihrem ventilsitzzugewandten Ende in einer konischen Dichtfläche 9. Zwischen dem Schaftbereich 207 und der Wand der Bohrung 5 ist ein Druckraum 11 ausgebildet, der über einen Zulaufkanal 17 mit Kraftstoff unter hohem Druck befüllbar ist. Durch den Druck im Druckraum 11 wirkt eine vom Ventilsitz weggerichtete Öffnungskraft auf die Druckschulter 12 der Ventilnadel 7, der eine Schließkraft entgegenwirkt, die auf das ventilsitzabgewandte Ende der Ventilnadel 7 einwirkt, bspw. durch ein Federelement oder einen mit wechselndem Kraftstoffdruck befiillbaren Steuerraum.In FIG. 1 is a longitudinal section through a fuel injection valve according to the invention shown schematically. The fuel injection valve has a housing 1, which comprises a valve body 3. In the valve body 3, a bore 5 is formed, which is bounded at its combustion-chamber end by a conical valve seat 8. In the bore 5, a valve needle 7 is arranged longitudinally displaceable, which is guided in a guide portion 107 in the bore 5. Starting from the guide region 107, the valve needle 7 tapers to form a pressure shoulder 12, merges into a shaft region 207 and finally ends at its valve seat facing end in a conical sealing surface 9. Between the shaft region 207 and the wall of the bore 5, a pressure chamber 11 is formed, which is filled via an inlet channel 17 with fuel at high pressure. Due to the pressure in the pressure chamber 11, a force directed away from the valve seat opening force acts on the pressure shoulder 12 of the valve needle 7, which counteracts a closing force acting on the valve seat facing away from the valve needle 7, for example. By a spring element or a befiillbaren with changing fuel pressure control chamber.

Im Ventilsitz 8 sind mehrere Einspritzöffnungen 15 ausgebildet, die in den Brennraum der Brennkraftmaschine münden, wenn das Kraftstoffeinspritzventil in eine entsprechende Brennkraftmaschine eingebaut ist. Die Ventilnadel 7 wirkt mit ihrer Dichtfläche 9 mit dem Ventilsitz 8 zusammen und zwar in der Weise, dass bei Anlage der Ventilnadel 7 am Ventilsitz 8 der Druckraum 11 von den Einspritzöffnungen 15 getrennt wird, während bei vom Ventilsitz 8 abgehobener Ventilnadel 7 ein Kraftstofffluss aus dem Druckraum 11 zu den Einspritzöffnungen 15 stattfindet, durch die Kraftstoff in den Brennraum der Brennkraftmaschine eingespritzt wird.In the valve seat 8 a plurality of injection openings 15 are formed, which open into the combustion chamber of the internal combustion engine when the fuel injection valve is installed in a corresponding internal combustion engine. The valve needle 7 cooperates with its sealing surface 9 with the valve seat 8 in such a way that upon contact of the valve needle 7 on the valve seat 8, the pressure chamber 11 is separated from the injection ports 15, while lifted from the valve seat 8 valve needle 7, a fuel flow from the Pressure chamber 11 takes place to the injection openings 15, is injected by the fuel into the combustion chamber of the internal combustion engine.

Figur 2 zeigt eine Vergrößerung von Figur 1 im Bereich des Ventilsitzes 8, wobei der Bereich in Figur 1 mit II bezeichnet ist. Die vergrößert dargestellte Einspritzöffnung 15 weist in ihrer Innenseite eine Vielzahl von Noppen 20 auf, die die Innenseite auskleiden. Die Noppen 20 können sich auch auf der Stirnseite 103 des Ventilkörpers 3 fortsetzen, vor allem in dem Bereich, der die Austrittsöffnungen der Einspritzöffnungen 15 umgibt. Es kann aber auch vorgesehen sein, die gesamte Oberfläche des Kraftstoffeinspritzventils, die in den Brennraum ragt, mit Noppen 20 zu versehen. FIG. 2 shows an enlargement of FIG. 1 in the region of the valve seat 8, wherein the area in FIG. 1 denoted by II. The enlarged illustrated injection port 15 has in its inside a plurality of nubs 20 which line the inside. The knobs 20 can continue on the end face 103 of the valve body 3, especially in the area surrounding the outlet openings of the injection openings 15. But it can also be provided to provide the entire surface of the fuel injection valve, which projects into the combustion chamber, with nubs 20.

Durch die Noppen 20 bekommt die Oberfläche der Einspritzöffnung 15 schmutzabweisende Eigenschaften, die als sogenannter Lotuseffekt bekannt sind. Schmutz oder Rußpartikel, die sich auf dieser Oberfläche ablagern, berühren die Oberfläche nur an der Spitze der Noppen 20, sodass nur sehr geringe Adhäsionskräfte zwischen dem Schmutzpartikel und der Oberfläche vorhanden sind. Die Schmutz oder Rußpartikel könnend dann durch den Kraftstoffstrom, der bei der Einspritzung durch die Einspritzöffnung 15 hindurchfließt, leicht mitgerissen werden, sodass es zu keinen Anlagerungen von derartigen Partikeln kommt und die Einspritzöffnung 15 bleibt über die gesamte Lebensdauer des Einspritzventils unverändert.By the nubs 20, the surface of the injection port 15 gets dirt-repellent properties, which are known as the so-called lotus effect. Dirt or soot particles that deposit on this surface touch the surface only at the tip of the dimples 20, so that only very low adhesion forces between the dirt particle and the surface are present. The dirt or soot particles can then easily be entrained by the fuel flow which flows through the injection opening 15 during the injection, so that no deposits of such particles occur, and the injection opening 15 remains unchanged over the entire service life of the injection valve.

Figur 3a zeigt den mit III bezeichneten Ausschnitt von Figur 2 in vergrößerter Darstellung. Die Noppen 20 weisen hier eine kegelförmige Gestalt auf und haben einen Durchmesser d, der vorzugsweise im Bereich von 1 bis 10 µm liegt. Die Höhe der Noppen 20 bewegt sich in derselben Größenordnung, wobei die Noppen 20 sehr dicht angeordnet sind und zwischen den einzelnen Noppen 20 kein oder nur sehr geringer Raum vorhanden ist. FIG. 3a shows the section of III designated by FIG. 2 in an enlarged view. The nubs 20 here have a conical shape and have a diameter d, which is preferably in the range of 1 to 10 microns. The height of the knobs 20 moves in the same order of magnitude, the knobs 20 are arranged very close and between the individual knobs 20 no or very little space is available.

Figur 3b zeigt ein weiteres Ausführungsbeispiel, bei dem die Noppen 20 eine etwas andere Gestalt aufweisen und abgerundet ausgebildet sind. Die Höhe der einzelnen Noppen h1, h2 kann unterschiedlich sein, sodass beispielsweise eine stochastische Verteilung der Höhen gegeben ist. Genauso kann es vorgesehen sein, die Noppen 20 entweder gleichmäßig über die Oberfläche zu verteilen oder stochastisch zu verteilen, sodass sich eine ungleichmäßige Anordnung von Noppen ergibt. FIG. 3b shows a further embodiment in which the studs 20 have a slightly different shape and are rounded. The height of the individual knobs h 1 , h 2 may be different, so that, for example, a stochastic distribution of heights is given. Likewise, it may be provided to distribute the knobs 20 either evenly over the surface or stochastically to distribute, resulting in a non-uniform arrangement of pimples.

Die Herstellung solcher Noppen kann mit verschiedenen Verfahren geschehen. In Frage kommen z.B. die Beschichtung mit einem entsprechenden Material, das bei der Aushärtung eine solch noppenartige Struktur ausbildet, oder die Bearbeitung der Oberfläche mit einem Laser oder mit einem Sputter-Verfahren.The production of such nubs can be done with different methods. For example, the coating with a corresponding material that forms such a knob-like structure when cured, or the treatment of the surface with a laser or with a sputtering process.

Neben der Ausbildung der Noppen in abgerundeter Form oder in Form von Kegeln sind auch andere Formen denkbar wie bspw. Pyramiden oder sonstige Spitzen, die entsprechend dicht und klein ausgebildet sind, um die Anlagerung von Ruß und sonstigen Schmutzpartikeln zu verhindern.In addition to the formation of the knobs in a rounded shape or in the form of cones, other shapes are conceivable such as, for example, pyramids or other tips, which are formed according to dense and small, to prevent the addition of soot and other dirt particles.

Claims (7)

  1. Fuel injection valve for internal combustion engines having a housing (1) in which is formed at least one injection opening (15) which has an inlet opening and an outlet opening and through which fuel can be injected into a combustion chamber of the internal combustion engine, with the outlet opening being arranged on the outside of the housing (1; 3), characterized in that the inside of the at least one injection opening (15) is provided with knobs (20).
  2. Fuel injection valve according to Claim 1, characterized in that the injection opening (15) is formed as a bore in the housing (1; 3).
  3. Fuel injection valve according to Claim 1, characterized in that the knobs (20) have a substantially conical shape.
  4. Fuel injection valve according to Claim 1, characterized in that the knobs (20) have different diameters (d).
  5. Fuel injection valve according to Claim 1, characterized in that the knobs (20) have different heights (h1; h2) .
  6. Fuel injection valve according to Claim 1, 4 or 5, characterized in that the knobs (20) are arranged distributed non-uniformly over the wall of the injection opening (15).
  7. Fuel injection valve according to Claim 1 or 4, characterized in that the knobs (20) have a diameter (d) of 1 to 10 µm.
EP05818956A 2004-12-29 2005-12-06 Fuel injection valve for internal combustion chambers Not-in-force EP1834080B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004063165A DE102004063165A1 (en) 2004-12-29 2004-12-29 Fuel injection valve for internal combustion engines
PCT/EP2005/056530 WO2006072521A1 (en) 2004-12-29 2005-12-06 Fuel injection valve for internal combustion chambers

Publications (2)

Publication Number Publication Date
EP1834080A1 EP1834080A1 (en) 2007-09-19
EP1834080B1 true EP1834080B1 (en) 2010-10-27

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EP05818956A Not-in-force EP1834080B1 (en) 2004-12-29 2005-12-06 Fuel injection valve for internal combustion chambers

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EP (1) EP1834080B1 (en)
AT (1) ATE486212T1 (en)
DE (2) DE102004063165A1 (en)
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Publication number Priority date Publication date Assignee Title
DE102011007876A1 (en) * 2011-04-21 2012-10-25 Robert Bosch Gmbh Component, in particular a fuel injection system, with a surface
DE102012206913A1 (en) * 2012-04-26 2013-10-31 Robert Bosch Gmbh Fuel injection device and method of making such a device
JP6897164B2 (en) * 2017-03-03 2021-06-30 株式会社Ihi Fuel injection valve
DE102018217598A1 (en) * 2018-10-15 2020-04-16 Continental Automotive Gmbh Fuel injector and method for producing a nozzle body for a fuel injector
JP2021050742A (en) * 2021-01-04 2021-04-01 株式会社Ihi Fuel injection valve

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IT214617Z2 (en) * 1988-06-23 1990-05-09 Weber Srl NOZZLE FOR A FUEL DOSING AND SPRAYING VALVE FOR AN INTERNAL COMBUSTION ENGINE FEEDING DEVICE
DE4200709A1 (en) 1992-01-14 1993-07-15 Bosch Gmbh Robert FUEL INJECTION NOZZLE FOR INTERNAL COMBUSTION ENGINES
DE59611321D1 (en) * 1995-03-29 2006-03-30 Bosch Gmbh Robert Perforated disk, in particular for injection valves and method for producing a perforated disk
DE19951014A1 (en) * 1999-07-02 2001-01-04 Bosch Gmbh Robert Fuel injector
US6848635B2 (en) * 2002-01-31 2005-02-01 Visteon Global Technologies, Inc. Fuel injector nozzle assembly with induced turbulence
DE10350548A1 (en) * 2003-10-29 2005-06-02 Robert Bosch Gmbh Fuel injector
DE102004020175A1 (en) 2004-04-24 2005-11-17 Robert Bosch Gmbh Fuel injector for diesel internal combustion engines

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DE102004063165A1 (en) 2006-07-13
ATE486212T1 (en) 2010-11-15
EP1834080A1 (en) 2007-09-19
DE502005010456D1 (en) 2010-12-09
WO2006072521A1 (en) 2006-07-13

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