EP1423604B1 - Fuel injection valve - Google Patents

Fuel injection valve Download PDF

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Publication number
EP1423604B1
EP1423604B1 EP02754212A EP02754212A EP1423604B1 EP 1423604 B1 EP1423604 B1 EP 1423604B1 EP 02754212 A EP02754212 A EP 02754212A EP 02754212 A EP02754212 A EP 02754212A EP 1423604 B1 EP1423604 B1 EP 1423604B1
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EP
European Patent Office
Prior art keywords
fuel injection
injection valve
cone
region
diameter
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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 - Lifetime
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EP02754212A
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German (de)
French (fr)
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EP1423604A1 (en
Inventor
Jürgen RAIMANN
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Robert Bosch GmbH
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Robert Bosch GmbH
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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
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
    • F02M51/0625—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
    • F02M51/0664—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding
    • F02M51/0671—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding the armature having an elongated valve body attached thereto
    • 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
    • F02M57/00—Fuel-injectors combined or associated with other devices
    • 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
    • F02M2200/50—Arrangements of springs for valves used in fuel injectors or fuel injection pumps
    • F02M2200/505—Adjusting spring tension by sliding spring seats
    • 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
    • F02M61/165—Filtering elements specially adapted in fuel inlets to injector

Definitions

  • the invention is based on a fuel injection valve according to the preamble of the main claim, as from the document DE 34 24 891 A known.
  • a Fuel injector includes the fuel in one combustion chamber formed by a piston / cylinder construction injected, and with a protruding into the combustion chamber Spark plug is provided.
  • the fuel injection valve is with at least one row over the circumference of the Fuel injector arranged distributed Provided injection holes. Through a targeted injection of fuel through the injection holes becomes one beam-guided combustion process by forming a Mixture cloud realized with at least one jet.
  • a disadvantage of the above-mentioned document known fuel injection valve is in particular the Coking of the ejection openings, which thereby clog and the flow through the fuel injector diminish impermissibly. This leads to malfunctions the internal combustion engine.
  • the fuel injection valve according to the invention with the characterizing features of the main claim has In contrast, the advantage that a downstream of the Spray openings of the fuel injection valve arranged flameproof cone the temperature of the flame front the blowing mixture cloud in the Spray openings so much reduced that no Combustion residues in the area of the injection orifices which can cause the growth of the Spray holes is avoided by coking residues.
  • the flame arrester is on discharge-side end of the fuel injection valve, on the valve seat body, formed.
  • the flameproof cone as Cone or truncated cone, as a multi-part cone with different inclination angles or as a truncated cone with an attached ball is formed, whereby on the one hand a simple and inexpensive production is possible and on the other hand arbitrary injection situations with any Number and arrangement of injection ports accounted for can be.
  • Fig. 1 shows in an excerpted sectional view Embodiment of an inventive Fuel Injector 1.
  • the fuel injector 1 is in the form of a fuel injection valve 1 for Fuel injection systems of mixture compression, spark-ignited internal combustion engines running.
  • the Fuel injector 1 is suitable for direct Injecting fuel into a not shown Combustion chamber of an internal combustion engine.
  • the fuel injection valve 1 consists of a Nozzle body 2, in which a valve needle 3 is arranged.
  • the valve needle 3 is for example via a weld 41 in operative connection with a valve closing body 4, the arranged with a valve seat body 5 on a Valve seat surface 6 cooperates to a sealing seat.
  • Fuel injection valve 1 is in Embodiment to an inwardly opening Fuel injection valve 1, which over several Abspritzö Anlagenen 7 has, at least one for Axis of the valve seat body 5 concentric circle are arranged.
  • the nozzle body 2 is by a seal 8 against a Outer pole 9 acting as an actuator for the valve needle 3 Magnetic coil 10 sealed.
  • the magnetic coil 10 is in one Coil housing 11 encapsulated and on a bobbin 12th wound, which at an inner pole 13 of the magnetic coil 10th is applied.
  • the inner pole 13 and the outer pole 9 are connected by a Split 26 separated from each other and rely on a Connecting component 29 from.
  • the magnetic coil 10 is connected via a Line 19 of a via an electrical plug contact 17th energized electric current.
  • the plug contact 17 is surrounded by a plastic sheath 18, the Inner pole 13 may be molded.
  • the valve needle 3 is in a valve needle guide fourteenth guided, which is designed disk-shaped. to Stroke adjustment is a paired shim 15.
  • An the other side of the dial 15 is a Anchor 20. This is about a first flange 21st non-positively connected to the valve needle 3 in conjunction, which by a weld 22 with the first flange 21 connected is.
  • On the first flange 21 is supported Return spring 23 from which in the present design of Fuel injection valve 1 by a sleeve 24 Bias is brought.
  • a second flange 31st Downstream of the armature 20 is a second flange 31st arranged, which serves as a lower anchor stop. He is over a weld 33 frictionally with the valve needle. 3 connected. Between the armature 20 and the second flange 31 is an elastic intermediate ring 32 for damping Anchor bouncers when closing the fuel injector 1 arranged.
  • the armature 20 and the Valve seat body 5 extend fuel channels 30a to 30c.
  • the fuel is via a central fuel supply 16 supplied and filtered by a filter element 25.
  • the Fuel injection valve 1 is opposed by a seal 28 sealed a distribution line not shown.
  • the fuel injection valve 1 at the Valve seat body 5 a flameproof cone 34, which within the at least one circle of ejection openings 7 is attached.
  • the flameproof cone 34 reduced by its arrangement downstream of the spray openings 7 the Coking tendency and thus prevents malfunction of the Fuel injection valve 1 by clogging the Spray openings 7 and an impermissible reduction in the Fuel flow before.
  • a spray-side end 35 of the Fuel injection valve 1 with the inventive Measures is shown in more detail in FIGS. 2 and 3A.
  • the armature 20 drops sufficient reduction of the magnetic field by the pressure of the Return spring 23 on the first flange 21 from the inner pole thirteenth from, causing the valve needle 3 against the stroke direction emotional. As a result, the valve closing body 4 is placed on the Valve seat surface 6 and the fuel injection valve. 1 will be closed. The armature 20 sits on the through the second flange 31 formed anchor stop.
  • Fig. 2 shows an enlarged schematic view of the Spray-side end 35 of the illustrated in Fig. 1 Inventively designed fuel injection valve. 1 in region II in FIG. 1.
  • the fuel injection valve 1 has a Flame protection cone 34, which for lowering the Flame temperature in the region of the ejection openings 7, for example, on the valve seat body 5, is arranged.
  • the Flame protection cone 34 is designed pointed cone and can with the valve seat body 5 either in one piece trained or in a suitable manner, for example by means of Soldering, welding or gluing to be fixed to this.
  • the axial length L and the diameter D of Flame protection cone 34 depends on the opening angle ⁇ in from the combustion chamber injected mixture cloud and should each be sized so that the flameproof cone 34 is not is wetted by the mixture cloud.
  • the coking of Spray openings 7 can be reduced. Because the diameter of the Spray openings 7 is typically about 100 microns, is the risk that the ejection openings 7 by coking with clog the time and thus the flow rate inadmissible is severely restricted, relatively large. This is in particular by the high temperatures during ignition the injected into the combustion chamber mixture cloud, since thereby components of the fuel at the top of the Deposit fuel injector 1.
  • the flameproof cone 34 prevents in particular the propagation of the flame front in Area of the spray openings 7.
  • FIG. 3A to 3C show that shown in FIG. 2 and with III designated section of the invention designed fuel injection valve 1 with different embodiments of the invention Flameproof cone 34.
  • Fig. 3A shows the simple conical shape, which has already been addressed with reference to FIG. 2.
  • the length L of the flameproof cone 34 and its diameter D at the base depend on the shape and the opening angle ⁇ of the injected mixture cloud.
  • the axial length L is typically up to three times the diameter D B of the discharge-side end 35 of the fuel injection valve 1, while the diameter D is at most half the diameter D B of the discharge-side end 35 of the fuel injection valve 1.
  • FIG. 3B shows another possible form of the flameproof cone 34.
  • a valve seat body 5 facing first portion 36 is frusto-conical, the diameter D increases from the base in Abspritzraum.
  • This is followed by a second region 37, which is frusto-conical.
  • the diameter D of the first region 36 is at the base to half the diameter D B of the downstream end 35 of the fuel injection valve 1 and can increase up to one and a half times the diameter D B of the downstream end 35 of the fuel injection valve 1 at the base of the second region 37.
  • the axial length L of the flameproof cone 34 can be up to four times the diameter D B of the fuel injection valve 1 in the region of the valve seat body 5, of which up to a quarter is attributable to the second region 37.
  • 3C shows a third embodiment of the flameproof cone 34 according to the invention, the shape of a truncated cone 38 having an attached ball 39 being selected here.
  • the axial length L of the truncated cone 38 can be as in the first embodiment, up to three times the diameter D B of the fuel injector 1 in the region of the valve seat body 5, while the ball 39 can reach a diameter d which corresponds to the diameter D B of the fuel injection valve 1 in Area of the valve closing body 5 corresponds.
  • the invention is not limited to those shown Embodiments limited and for any forms of Flame protection cones 34, which in any way on discharge-side end of the fuel injection valve. 1 can be fixed, and for any construction of Fuel injectors 1 applicable.

Description

Die Erfindung geht aus von einem Brennstoffeinspritzventil nach der Gattung des Hauptanspruchs, wie aus der Druckschrift DE 34 24 891 A bekannt.The invention is based on a fuel injection valve according to the preamble of the main claim, as from the document DE 34 24 891 A known.

Aus der DE 198 04 463 A1 ist ein Brennstoffeinspritzsystem für eine gemischverdichtende, fremdgezündete Brennkraftmaschine bekannt, welches ein Brennstoffeinspritzventil umfaßt, das Brennstoff in einen von einer Kolben-/Zylinderkonstruktion gebildeten Brennraum einspritzt, und mit einer in den Brennraum ragenden Zündkerze versehen ist. Das Brennstoffeinspritzventil ist mit mindestens einer Reihe über den Umfang des Brennstoffeinspritzventils verteilt angeordneten Einspritzlöchern versehen. Durch eine gezielte Einspritzung von Brennstoff über die Einspritzlöcher wird eine strahlgeführtes Brennverfahren durch Bildung einer Gemischwolke mit mindestens einem Strahl realisiert.From DE 198 04 463 A1 is a fuel injection system for a mixture-compacting, spark-ignited Internal combustion engine is known which a Fuel injector includes the fuel in one combustion chamber formed by a piston / cylinder construction injected, and with a protruding into the combustion chamber Spark plug is provided. The fuel injection valve is with at least one row over the circumference of the Fuel injector arranged distributed Provided injection holes. Through a targeted injection of fuel through the injection holes becomes one beam-guided combustion process by forming a Mixture cloud realized with at least one jet.

Nachteilig an dem aus der obengenannten Druckschrift bekannten Brennstoffeinspritzventil ist insbesondere die Verkokung der Abspritzöffnungen, welche dadurch verstopfen und den Durchfluß durch das Brennstoffeinspritzventil unzulässig stark vermindern. Dies führt zu Fehlfunktionen der Brennkraftmaschine. A disadvantage of the above-mentioned document known fuel injection valve is in particular the Coking of the ejection openings, which thereby clog and the flow through the fuel injector diminish impermissibly. This leads to malfunctions the internal combustion engine.

Vorteile der ErfindungAdvantages of the invention

Das erfindungsgemäße Brennstoffeinspritzventil mit den kennzeichnenden Merkmalen des Hauptanspruchs hat demgegenüber den Vorteil, daß ein abströmseitig der Abspritzöffnungen des Brennstoffeinspritzventils angeordneter Flammschutzkegel die Temperatur der Flammfront der durchbrennenden Gemischwolke im Bereich der Abspritzöffnungen so stark verringert, daß sich keine Verbrennungsrückstände im Bereich der Abspritzöffnungen niederschlagen können, wodurch ein Zuwachsen der Abspritzöffnungen durch Verkokungsrückstände vermieden wird.The fuel injection valve according to the invention with the characterizing features of the main claim has In contrast, the advantage that a downstream of the Spray openings of the fuel injection valve arranged flameproof cone the temperature of the flame front the blowing mixture cloud in the Spray openings so much reduced that no Combustion residues in the area of the injection orifices which can cause the growth of the Spray holes is avoided by coking residues.

Der Flammschutzkegel ist am abspritzseitigen Ende des Brennstoffeinspritzventils, am Ventilsitzkörper, ausgebildet.The flame arrester is on discharge-side end of the fuel injection valve, on the valve seat body, formed.

Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen des im Hauptanspruch angegebenen Brennstoffeinspritzsystems möglich.By the measures listed in the dependent claims are advantageous developments of the main claim specified fuel injection system possible.

Von Vorteil ist insbesondere, daß der Flammschutzkegel als Kegel oder Kegelstumpf, als mehrteiliger Kegel mit unterschiedlichen Neigungswinkeln oder als Kegelstumpf mit einer aufgesetzten Kugel ausgebildet ist, wodurch einerseits eine einfache und kostengünstige Herstellung möglich ist und andererseits beliebigen Einspritzsituationen mit beliebiger Anzahl und Anordnung von Abspritzöffnungen Rechnung getragen werden kann.It is particularly advantageous that the flameproof cone as Cone or truncated cone, as a multi-part cone with different inclination angles or as a truncated cone with an attached ball is formed, whereby on the one hand a simple and inexpensive production is possible and on the other hand arbitrary injection situations with any Number and arrangement of injection ports accounted for can be.

Weiterhin ist es in einfacher Weise möglich, durch eine Neigung des Flammschutzkegels eine schräge Einspritzung unter einem beliebigen Einspritzwinkel zu realisieren. Furthermore, it is possible in a simple manner, by a Tilt of flameproof cone a slanted injection to realize under any injection angle.

Zeichnungdrawing

Ausführungsbeispiele der Erfindung sind in der Zeichnung vereinfacht dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen:

Fig. 1
einen schematischen Schnitt durch ein erstes Ausführungsbeispiel eines erfindungsgemäßen Brennstoffeinspritzventils in einer Gesamtansicht;
Fig. 2
eine vergrößerte schematische Ansicht des abspritzseitigen Teils des in Fig. 1 dargestellten Brennstoffeinspritzventils im Bereich II in Fig. 1;
Fig. 3A-C
Ausführungsbeispiele eines erfindungsgemäß ausgestalteten Flammschutzkegels, der jeweils an einem abspritzseitigen Ende des Brennstoffeinspritzventils angebracht ist; und
Fig. 4
ein Ausführungsbeispiel eines erfindungsgemäß ausgestalteten Flammschutzkegels an einem Brennstoffeinspritzventil, welches zur Schrägeinspritzung geeignet ist.
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
a schematic section through a first embodiment of a fuel injection valve according to the invention in an overall view;
Fig. 2
an enlarged schematic view of the discharge-side portion of the fuel injection valve shown in Figure 1 in the region II in Fig. 1.
Fig. 3A-C
Embodiments of an inventively designed flame arrester cone, which is mounted in each case at a discharge-side end of the fuel injection valve; and
Fig. 4
An embodiment of an inventively designed flame arrester cone on a fuel injection valve, which is suitable for oblique injection.

Beschreibung der AusführungsbeispieleDescription of the embodiments

Fig. 1 zeigt in einer auszugsweisen Schnittdarstellung ein Ausführungsbeispiel eines erfindungsgemäßen Brennstoffeinspritzventils 1. Das Brennstoffeinspritzventil 1 ist in der Form eines Brennstoffeinspritzventils 1 für Brennstoffeinspritzanlagen von gemischverdichtenden, fremdgezündeten Brennkraftmaschinen ausgeführt. Das Brennstoffeinspritzventil 1 eignet sich zum direkten Einspritzen von Brennstoff in einen nicht dargestellten Brennraum einer Brennkraftmaschine.Fig. 1 shows in an excerpted sectional view Embodiment of an inventive Fuel Injector 1. The fuel injector 1 is in the form of a fuel injection valve 1 for Fuel injection systems of mixture compression, spark-ignited internal combustion engines running. The Fuel injector 1 is suitable for direct Injecting fuel into a not shown Combustion chamber of an internal combustion engine.

Das Brennstoffeinspritzventil 1 besteht aus einem Düsenkörper 2, in welchem eine Ventilnadel 3 angeordnet ist. The fuel injection valve 1 consists of a Nozzle body 2, in which a valve needle 3 is arranged.

Die Ventilnadel 3 steht beispielsweise über eine Schweißnaht 41 in Wirkverbindung mit einem Ventilschließkörper 4, der mit einer auf einem Ventilsitzkörper 5 angeordneten Ventilsitzfläche 6 zu einem Dichtsitz zusammenwirkt. Bei dem Brennstoffeinspritzventil 1 handelt es sich im Ausführungsbeispiel um ein nach innen öffnendes Brennstoffeinspritzventil 1, welches über mehrere Abspritzöffnungen 7 verfügt, die auf zumindest einem zur Achse des Ventilsitzkörpers 5 konzentrischen Kreis angeordnet sind.The valve needle 3 is for example via a weld 41 in operative connection with a valve closing body 4, the arranged with a valve seat body 5 on a Valve seat surface 6 cooperates to a sealing seat. In which Fuel injection valve 1 is in Embodiment to an inwardly opening Fuel injection valve 1, which over several Abspritzöffnungen 7 has, at least one for Axis of the valve seat body 5 concentric circle are arranged.

Der Düsenkörper 2 ist durch eine Dichtung 8 gegen einen Außenpol 9 einer als Aktor für die Ventilnadel 3 wirkenden Magnetspule 10 abgedichtet. Die Magnetspule 10 ist in einem Spulengehäuse 11 gekapselt und auf einen Spulenträger 12 gewickelt, welcher an einem Innenpol 13 der Magnetspule 10 anliegt. Der Innenpol 13 und der Außenpol 9 sind durch einen Spalt 26 voneinander getrennt und stützen sich auf einem Verbindungsbauteil 29 ab. Die Magnetspule 10 wird über eine Leitung 19 von einem über einen elektrischen Steckkontakt 17 zuführbaren elektrischen Strom erregt. Der Steckkontakt 17 ist von einer Kunststoffummantelung 18 umgeben, die am Innenpol 13 angespritzt sein kann.The nozzle body 2 is by a seal 8 against a Outer pole 9 acting as an actuator for the valve needle 3 Magnetic coil 10 sealed. The magnetic coil 10 is in one Coil housing 11 encapsulated and on a bobbin 12th wound, which at an inner pole 13 of the magnetic coil 10th is applied. The inner pole 13 and the outer pole 9 are connected by a Split 26 separated from each other and rely on a Connecting component 29 from. The magnetic coil 10 is connected via a Line 19 of a via an electrical plug contact 17th energized electric current. The plug contact 17 is surrounded by a plastic sheath 18, the Inner pole 13 may be molded.

Die Ventilnadel 3 ist in einer Ventilnadelführung 14 geführt, welche scheibenförmig ausgeführt ist. Zur Hubeinstellung dient eine zugepaarte Einstellscheibe 15. An der anderen Seite der Einstellscheibe 15 befindet sich ein Anker 20. Dieser steht über einen ersten Flansch 21 kraftschlüssig mit der Ventilnadel 3 in Verbindung, welche durch eine Schweißnaht 22 mit dem ersten Flansch 21 verbunden ist. Auf dem ersten Flansch 21 stützt sich eine Rückstellfeder 23 ab, welche in der vorliegenden Bauform des Brennstoffeinspritzventils 1 durch eine Hülse 24 auf Vorspannung gebracht wird.The valve needle 3 is in a valve needle guide fourteenth guided, which is designed disk-shaped. to Stroke adjustment is a paired shim 15. An the other side of the dial 15 is a Anchor 20. This is about a first flange 21st non-positively connected to the valve needle 3 in conjunction, which by a weld 22 with the first flange 21 connected is. On the first flange 21 is supported Return spring 23 from which in the present design of Fuel injection valve 1 by a sleeve 24 Bias is brought.

Abströmseitig des Ankers 20 ist ein zweiter Flansch 31 angeordnet, der als unterer Ankeranschlag dient. Er ist über eine Schweißnaht 33 kraftschlüssig mit der Ventilnadel 3 verbunden. Zwischen dem Anker 20 und dem zweiten Flansch 31 ist ein elastischer Zwischenring 32 zur Dämpfung von Ankerprellern beim Schließen des Brennstoffeinspritzventils 1 angeordnet.Downstream of the armature 20 is a second flange 31st arranged, which serves as a lower anchor stop. He is over a weld 33 frictionally with the valve needle. 3 connected. Between the armature 20 and the second flange 31 is an elastic intermediate ring 32 for damping Anchor bouncers when closing the fuel injector 1 arranged.

In der Ventilnadelführung 14, im Anker 20 und am Ventilsitzkörper 5 verlaufen Brennstoffkanäle 30a bis 30c. Der Brennstoff wird über eine zentrale Brennstoffzufuhr 16 zugeführt und durch ein Filterelement 25 gefiltert. Das Brennstoffeinspritzventil 1 ist durch eine Dichtung 28 gegen eine nicht weiter dargestellte Verteilerleitung abgedichtet.In the valve needle guide 14, the armature 20 and the Valve seat body 5 extend fuel channels 30a to 30c. The fuel is via a central fuel supply 16 supplied and filtered by a filter element 25. The Fuel injection valve 1 is opposed by a seal 28 sealed a distribution line not shown.

Erfindungsgemäß weist das Brennstoffeinspritzventil 1 an dem Ventilsitzkörper 5 einen Flammschutzkegel 34 auf, welcher innerhalb des zumindest einen Kreises von Abspritzöffnungen 7 angebracht ist. Der Flammschutzkegel 34 vermindert durch seine Anordnung abströmseitig der Abspritzöffnungen 7 die Verkokungsneigung und beugt so Fehlfunktionen des Brennstoffeinspritzventils 1 durch Verstopfen der Abspritzöffnungen 7 und einer unzulässigen Verringerung des Brennstoffdurchflusses vor. Ein abspritzseitiges Ende 35 des Brennstoffeinspritzventils 1 mit den erfindungsgemäßen Maßnahmen ist in den Fig. 2 und 3A näher dargestellt.According to the invention, the fuel injection valve 1 at the Valve seat body 5 a flameproof cone 34, which within the at least one circle of ejection openings 7 is attached. The flameproof cone 34 reduced by its arrangement downstream of the spray openings 7 the Coking tendency and thus prevents malfunction of the Fuel injection valve 1 by clogging the Spray openings 7 and an impermissible reduction in the Fuel flow before. A spray-side end 35 of the Fuel injection valve 1 with the inventive Measures is shown in more detail in FIGS. 2 and 3A.

Im Ruhezustand des Brennstoffeinspritzventils 1 wird der erste Flansch 21 an der Ventilnadel 3 von der Rückstellfeder 23 entgegen einer Hubrichtung so beaufschlagt, daß der Ventilschließkörper 4 am Ventilsitz 6 in dichtender Anlage gehalten wird. Der Anker 20 liegt auf dem Zwischenring 32 auf, der sich auf dem zweiten Flansch 31 abstützt. Bei Erregung der Magnetspule 10 baut diese ein Magnetfeld auf, welches den Anker 20 entgegen der Federkraft der Rückstellfeder 23 in Hubrichtung bewegt. Dabei nimmt der Anker 20 den ersten Flansch 21, welcher mit der Ventilnadel 3 verschweißt ist, und damit die Ventilnadel 3 ebenfalls in Hubrichtung mit. Der mit der Ventilnadel 3 in Wirkverbindung stehende Ventilschließkörper 4 hebt von der Ventilsitzfläche 6 ab, wodurch der Brennstoff an den Abspritzöffnungen 7 abgespritzt wird. In the idle state of the fuel injection valve 1 is the first flange 21 on the valve needle 3 of the return spring 23 acted against a stroke direction so that the Valve-closing body 4 on the valve seat 6 in sealing contact is held. The armature 20 is located on the intermediate ring 32nd on, which is supported on the second flange 31. at Excitation of the magnetic coil 10 builds this a magnetic field, which the armature 20 against the spring force of Return spring 23 moves in the stroke direction. It takes the Anchor 20, the first flange 21, which with the valve needle 3 is welded, and thus the valve needle 3 also in Lifting direction with. The with the valve needle 3 in operative connection standing valve closing body 4 lifts from the valve seat surface 6, whereby the fuel at the ejection openings. 7 is hosed.

Wird der Spulenstrom abgeschaltet, fällt der Anker 20 nach genügendem Abbau des Magnetfeldes durch den Druck der Rückstellfeder 23 auf den ersten Flansch 21 vom Innenpol 13 ab, wodurch sich die Ventilnadel 3 entgegen der Hubrichtung bewegt. Dadurch setzt der Ventilschließkörper 4 auf der Ventilsitzfläche 6 auf und das Brennstoffeinspritzventil 1 wird geschlossen. Der Anker 20 setzt auf dem durch den zweiten Flansch 31 gebildeten Ankeranschlag auf.If the coil current is turned off, the armature 20 drops sufficient reduction of the magnetic field by the pressure of the Return spring 23 on the first flange 21 from the inner pole thirteenth from, causing the valve needle 3 against the stroke direction emotional. As a result, the valve closing body 4 is placed on the Valve seat surface 6 and the fuel injection valve. 1 will be closed. The armature 20 sits on the through the second flange 31 formed anchor stop.

Fig. 2 zeigt in einer vergrößerten schematischen Ansicht das abspritzseitige Ende 35 des in Fig. 1 dargestellten erfindungsgemäß ausgestalteten Brennstoffeinspritzventils 1 im Bereich II in Fig. 1.Fig. 2 shows an enlarged schematic view of the Spray-side end 35 of the illustrated in Fig. 1 Inventively designed fuel injection valve. 1 in region II in FIG. 1.

Wie bereits in der Beschreibung zu Fig. 1 angesprochen, verfügt das Brennstoffeinspritzventil 1 über einen Flammschutzkegel 34, welcher zur Absenkung der Flammtemperatur im Bereich der Abspritzöffnungen 7, beispielsweise am Ventilsitzkörper 5, angeordnet ist. Der Flammschutzkegel 34 ist dabei spitzkegelig ausgebildet und kann mit dem Ventilsitzkörper 5 entweder einstückig ausgebildet oder in geeigneter Weise, beispielsweise mittels Löten, Schweißen oder Kleben, an diesem fixiert sein.As already mentioned in the description of FIG. 1, the fuel injection valve 1 has a Flame protection cone 34, which for lowering the Flame temperature in the region of the ejection openings 7, for example, on the valve seat body 5, is arranged. Of the Flame protection cone 34 is designed pointed cone and can with the valve seat body 5 either in one piece trained or in a suitable manner, for example by means of Soldering, welding or gluing to be fixed to this.

Die axiale Länge L und der Durchmesser D des Flammschutzkegels 34 hängt dabei vom Öffnungswinkel α der in den Brennraum eingespritzten Gemischwolke ab und sollte jeweils so bemessen sein, daß der Flammschutzkegel 34 nicht von der Gemischwolke benetzt wird.The axial length L and the diameter D of Flame protection cone 34 depends on the opening angle α in from the combustion chamber injected mixture cloud and should each be sized so that the flameproof cone 34 is not is wetted by the mixture cloud.

Durch die Anordnung des Flammschutzkegels 34 abströmseitig der Abspritzöffnungen 7 kann die Verkokung der Abspritzöffnungen 7 reduziert werden. Da der Durchmesser der Abspritzöffnungen 7 typischerweise ca. 100 µm beträgt, ist die Gefahr, daß die Abspritzöffnungen 7 durch Verkokung mit der Zeit verstopfen und somit die Durchflußmenge unzulässig stark eingeschränkt wird, relativ groß. Dies ist insbesondere durch die hohen Temperaturen beim Durchzünden der in den Brennraum eingespritzten Gemischwolke bedingt, da sich dadurch Bestandteile des Brennstoffs an der Spitze des Brennstoffeinspritzventils 1 absetzen. Durch die Anbringung des Flammschutzkegels 34 kann die Oberflächentemperatur im Austrittsbereich der Abspritzöffnungen 7 so weit reduziert werden, daß die Abspritzöffnungen 7 nicht durch Verkokungsrückstände zuwachsen können. Der Flammschutzkegel 34 verhindert insbesondere die Ausbreitung der Flammfront im Bereich der Abspritzöffnungen 7.Due to the arrangement of the flame arresting cone 34 downstream the ejection openings 7, the coking of Spray openings 7 can be reduced. Because the diameter of the Spray openings 7 is typically about 100 microns, is the risk that the ejection openings 7 by coking with clog the time and thus the flow rate inadmissible is severely restricted, relatively large. This is in particular by the high temperatures during ignition the injected into the combustion chamber mixture cloud, since thereby components of the fuel at the top of the Deposit fuel injector 1. By attachment of the flameproof cone 34, the surface temperature in the Exit region of the spray openings 7 so far reduced be that the ejection openings 7 not through Coking residues can grow. The flameproof cone 34 prevents in particular the propagation of the flame front in Area of the spray openings 7.

Fig. 3A bis 3C zeigen den in Fig. 2 dargestellten und mit III bezeichneten Ausschnitt des erfindungsgemäß ausgestalteten Brennstoffeinspritzventils 1 mit unterschiedlichen Ausführungsformen des erfindungsgemäßen Flammschutzkegels 34.Fig. 3A to 3C show that shown in FIG. 2 and with III designated section of the invention designed fuel injection valve 1 with different embodiments of the invention Flameproof cone 34.

Fig. 3A zeigt dabei die einfache kegelförmige Form, die bereits anhand von Fig. 2 angesprochen wurde. Die Länge L des Flammschutzkegels 34 sowie sein Durchmesser D an der Basis hängen von der Form und dem Öffnungswinkel α der eingespritzten Gemischwolke ab. Die axiale Länge L beträgt typischerweise bis zum dreifachen des Durchmessers DB des abspritzseitigen Endes 35 des Brennstoffeinspritzventils 1, während der Durchmesser D maximal die Hälfte des Durchmessers DB des abspritzseitigen Endes 35 des Brennstoffeinspritzventils 1 beträgt.Fig. 3A shows the simple conical shape, which has already been addressed with reference to FIG. 2. The length L of the flameproof cone 34 and its diameter D at the base depend on the shape and the opening angle α of the injected mixture cloud. The axial length L is typically up to three times the diameter D B of the discharge-side end 35 of the fuel injection valve 1, while the diameter D is at most half the diameter D B of the discharge-side end 35 of the fuel injection valve 1.

In Fig. 3B ist eine weitere mögliche Form des Flammschutzkegels 34 dargestellt. Hierbei ist ein dem Ventilsitzkörper 5 zugewandter erster Bereich 36 kegelstumpfförmig ausgebildet, wobei der Durchmesser D von der Basis in Abspritzrichtung zunimmt. Daran schließt sich ein zweiter Bereich 37 an, der stumpfkegelig ausgebildet ist. Der Durchmesser D des ersten Bereiches 36 beträgt an der Basis bis zum halben Durchmesser DB des abströmseitigen Endes 35 des Brennstoffeinspritzventils 1 und kann bis zum eineinhalbfachen Durchmesser DB des abströmseitigen Endes 35 des Brennstoffeinspritzventils 1 am Ansatz des zweiten Bereichs 37 ansteigen. Die axiale Länge L des Flammschutzkegels 34 kann bis zum vierfachen des Durchmessers DB des Brennstoffeinspritzventils 1 im Bereich des Ventilsitzkörpers 5 betragen, wovon bis zu einem Viertel auf den zweiten Bereich 37 entfällt.FIG. 3B shows another possible form of the flameproof cone 34. Here, a valve seat body 5 facing first portion 36 is frusto-conical, the diameter D increases from the base in Abspritzrichtung. This is followed by a second region 37, which is frusto-conical. The diameter D of the first region 36 is at the base to half the diameter D B of the downstream end 35 of the fuel injection valve 1 and can increase up to one and a half times the diameter D B of the downstream end 35 of the fuel injection valve 1 at the base of the second region 37. The axial length L of the flameproof cone 34 can be up to four times the diameter D B of the fuel injection valve 1 in the region of the valve seat body 5, of which up to a quarter is attributable to the second region 37.

Fig. 3C zeigt eine dritte Ausführungsform des erfindungsgemäßen Flammschutzkegels 34, wobei hier die Form eines Kegelstumpfes 38 mit einer aufgesetzten Kugel 39 gewählt wurde. Die axiale Länge L des Kegelstumpfes 38 kann dabei wie im ersten Ausführungsbeispiel das bis zu dreifache des Durchmessers DB des Brennstoffeinspritzventils 1 im Bereich des Ventilsitzkörpers 5 betragen, während die Kugel 39 einen Durchmesser d erreichen kann, welche dem Durchmesser DB des Brennstoffeinspritzventils 1 im Bereich des Ventilschließkörpers 5 entspricht.3C shows a third embodiment of the flameproof cone 34 according to the invention, the shape of a truncated cone 38 having an attached ball 39 being selected here. The axial length L of the truncated cone 38 can be as in the first embodiment, up to three times the diameter D B of the fuel injector 1 in the region of the valve seat body 5, while the ball 39 can reach a diameter d which corresponds to the diameter D B of the fuel injection valve 1 in Area of the valve closing body 5 corresponds.

Analog zu den in Fig. 3A bis 3C dargestellten Ausführungsformen, bei denen der Winkel γ, unter welchem die Gemischwolke in den Brennraum eingespritzt wird, ungefähr 0° beträgt, können ähnliche Formen so am Ventilsitzkörper 5 angebracht werden, daß eine schräge Einspritzung unter einem beliebigen, von 0° verschiedenen Winkel γ erfolgen kann. Dies ist in Fig. 4 analog zu dem in Fig. 3A dargestellten Ausführungsbeispiel anhand des spitzkegeligen Flammschutzkegels 34 dargestellt.Analogous to that shown in FIGS. 3A to 3C Embodiments in which the angle γ, under which the Mixture cloud is injected into the combustion chamber, about 0 ° is similar shapes can thus on the valve seat body. 5 be attached, that an oblique injection under a can take place at any angle γ different from 0 °. This is analogous to that shown in Fig. 3A in Fig. 4 Embodiment based on the pointed cone Flame protection cone 34 shown.

Die Erfindung ist nicht auf die dargestellten Ausführungsbeispiele beschränkt und für beliebige Formen von Flammschutzkegeln 34, welche in beliebiger Weise am abspritzseitigen Ende des Brennstoffeinspritzventils 1 fixierbar sind, sowie für beliebige Bauweisen von Brennstoffeinspritzventilen 1 anwendbar.The invention is not limited to those shown Embodiments limited and for any forms of Flame protection cones 34, which in any way on discharge-side end of the fuel injection valve. 1 can be fixed, and for any construction of Fuel injectors 1 applicable.

Claims (15)

  1. Fuel injection valve (1) for the direct injection of fuel into the combustion chamber of internal combustion engines, having an actuator (10), a valve needle (3) which can be actuated by the actuator (10) for actuating a valve closing body (4) which forms a sealing seat together with a valve seat face (6) which is formed on a valve seat body (5), and at least one ejection opening (7) which is formed downstream of the valve seat (6), a flame protection cone (34) being arranged at an outflow end (42) of the fuel injection valve (1), characterized in that the flame protection cone (34) is formed on the valve seat body (5).
  2. Fuel injection valve according to Claim 1, characterized in that the flame protection cone (34) has a pointed cone shape.
  3. Fuel injection valve according to Claim 2, characterized in that an axial length L of the flame protection cone (34) is up to three times the diameter (DB) of the fuel injection valve (1) in the region of the valve seat body (5).
  4. Fuel injection valve according to Claim 2 or 3, characterized in that a radial diameter (D) of the flame protection cone (34) is up to half the diameter (DB) of the fuel injection valve (1) in the region of the valve seat body (5).
  5. Fuel injection valve according to Claim 1, characterized in that the flame protection cone (34) is configured in the shape of a multi-stepped cone or truncated cone.
  6. Fuel injection valve according to Claim 5, characterized in that the number of steps of the conical or frustoconical flame protection cone (34) is two.
  7. Fuel injection valve according to Claim 5 or 6, characterized in that a first region (36) which extends from the valve seat body (5) in the outflow direction widens radially in the outflow direction.
  8. Fuel injection valve according to Claim 7, characterized in that a second region (37) of frustoconical design adjoins the first region (36).
  9. Fuel injection valve according to one of Claims 5 to 8, characterized in that an axial length (L) of the flame protection cone (34) is up to four times the diameter (DB) of the fuel injection valve (1) in the region of the valve seat body (5).
  10. Fuel injection valve according to one of Claim 5 to 9, characterized in that a radial diameter (D) of the flame protection cone (34) is up to one and a half times the diameter (DB) of the fuel injection valve (1) in the region of the valve seat body (5).
  11. Fuel injection valve according to Claim 7 or 8, characterized in that the axial length (1) of the first region (36) is up to three times the diameter (DB) of the fuel injection valve (1) in the region of the valve seat body (5).
  12. Fuel injection valve according to Claim 1, characterized in that the flame protection cone (34) is configured in the shape of a truncated cone (38) with a ball (39) placed on top.
  13. Fuel injection valve according to Claim 12, characterized in that an axial length (L) of the flame protection cone (34) is up to three times the diameter (DB) of the fuel injection valve (1) in the region of the valve seat body (5).
  14. Fuel injection valve according to Claim 12 or 13, characterized in that the diameter (d) of the ball (39) is smaller than or equal to the diameter (DB) of the fuel injection valve (1) in the region of the valve seat body (5).
  15. Fuel injection valve according to one of Claims 1 to 14, characterized in that the flame protection cone (34) is inclined at an angle (γ) with respect to a longitudinal axis of the fuel injection valve (1).
EP02754212A 2001-08-29 2002-06-14 Fuel injection valve Expired - Lifetime EP1423604B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10142301A DE10142301A1 (en) 2001-08-29 2001-08-29 Fuel injection valve, for the direct injection of fuel at an IC motor, has a flame protection cone at the fuel injection openings to prevent a build-up of carbon residue deposits
DE10142301 2001-08-29
PCT/DE2002/002174 WO2003027488A1 (en) 2001-08-29 2002-06-14 Fuel injection valve

Publications (2)

Publication Number Publication Date
EP1423604A1 EP1423604A1 (en) 2004-06-02
EP1423604B1 true EP1423604B1 (en) 2005-05-04

Family

ID=7696980

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02754212A Expired - Lifetime EP1423604B1 (en) 2001-08-29 2002-06-14 Fuel injection valve

Country Status (6)

Country Link
US (1) US7021564B2 (en)
EP (1) EP1423604B1 (en)
JP (1) JP2005504219A (en)
KR (1) KR20040029017A (en)
DE (2) DE10142301A1 (en)
WO (1) WO2003027488A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112746923B (en) * 2020-07-29 2022-10-04 天津职业技术师范大学(中国职业培训指导教师进修中心) Split type side oil inlet oil sprayer oil inlet device and side oil inlet oil sprayer oil inlet system

Family Cites Families (15)

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Publication number Priority date Publication date Assignee Title
US1425329A (en) * 1918-08-26 1922-08-08 Adolph A Mellblom Spark plug
DE2905396A1 (en) * 1979-02-13 1980-08-14 Bosch Gmbh Robert Fuel injector for internal combustion engine - has replaceable insert at injection end to make maintenance cheaper
DE2939280A1 (en) * 1979-09-28 1981-04-16 Robert Bosch Gmbh, 7000 Stuttgart Fuel injection nozzle for diesel engine - has thin sleeve projecting into cylinder to prevent coking of injection nozzle by different thermal expansion
JPS57152458U (en) * 1981-03-23 1982-09-24
JPS5890365U (en) * 1981-12-15 1983-06-18 愛三工業株式会社 electromagnetic fuel injector
DE3225180A1 (en) * 1982-07-06 1984-01-12 Robert Bosch Gmbh, 7000 Stuttgart INJECTION VALVE
GB8318802D0 (en) * 1983-07-12 1983-08-10 Lucas Ind Plc Fuel injection nozzles
DE3623223A1 (en) * 1986-07-10 1988-02-04 Daimler Benz Ag Air-compressing, fuel injection internal combustion engine
US5161743A (en) * 1986-10-24 1992-11-10 Nippondenso Co., Ltd. Electromagnetic fuel injection valve for internal combustion engine
DE3928912A1 (en) * 1988-09-29 1990-04-05 Avl Verbrennungskraft Messtech Engine fuel injection nozzle - has pressure and leak-off chambers permanently connected with needle valve off seat
DE3841324A1 (en) * 1988-12-08 1990-06-13 Bosch Gmbh Robert Fuel injection nozzle for internal combustion engines
JP3136829B2 (en) * 1993-05-06 2001-02-19 株式会社デンソー Fuel injection valve
DE4442350A1 (en) * 1993-12-21 1995-06-22 Bosch Gmbh Robert Atomizing screen and fuel injector with one atomizing screen
DE4442355B4 (en) 1994-11-29 2004-02-12 Continental Teves Ag & Co. Ohg Procedure for recording and evaluating driving dynamics states
DE19804463B4 (en) * 1998-02-05 2006-06-14 Daimlerchrysler Ag Fuel injection system for gasoline engines

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Publication number Publication date
US7021564B2 (en) 2006-04-04
DE50203025D1 (en) 2005-06-09
DE10142301A1 (en) 2003-03-20
EP1423604A1 (en) 2004-06-02
KR20040029017A (en) 2004-04-03
US20040026536A1 (en) 2004-02-12
JP2005504219A (en) 2005-02-10
WO2003027488A1 (en) 2003-04-03

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