EP1402176B1 - Fuel-injection valve - Google Patents

Fuel-injection valve Download PDF

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Publication number
EP1402176B1
EP1402176B1 EP02742710A EP02742710A EP1402176B1 EP 1402176 B1 EP1402176 B1 EP 1402176B1 EP 02742710 A EP02742710 A EP 02742710A EP 02742710 A EP02742710 A EP 02742710A EP 1402176 B1 EP1402176 B1 EP 1402176B1
Authority
EP
European Patent Office
Prior art keywords
valve
fuel injection
injection valve
fuel
protection screen
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP02742710A
Other languages
German (de)
French (fr)
Other versions
EP1402176A1 (en
Inventor
Günter DANTES
Detlef Nowak
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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Filing date
Publication date
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Publication of EP1402176A1 publication Critical patent/EP1402176A1/en
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Publication of EP1402176B1 publication Critical patent/EP1402176B1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—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
    • F02M61/188—Spherical or partly spherical shaped valve member ends
    • 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
    • F02M51/0685—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 and the valve being allowed to move relatively to each other or not being attached to each other
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M53/00—Fuel-injection apparatus characterised by having heating, cooling or thermally-insulating means
    • F02M53/04—Injectors with heating, cooling, or thermally-insulating means
    • 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
    • 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
    • F02M2200/30—Fuel-injection apparatus having mechanical parts, the movement of which is damped
    • F02M2200/306—Fuel-injection apparatus having mechanical parts, the movement of which is damped using mechanical means
    • 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
    • F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
    • F02M61/10—Other injectors with elongated valve bodies, i.e. of needle-valve type
    • F02M61/12—Other injectors with elongated valve bodies, i.e. of needle-valve type characterised by the provision of guiding or centring means for valve bodies
    • 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

Definitions

  • the invention is based on a fuel injection valve according to the preamble of the main claim.
  • 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.
  • WO 95/17595 A1 is a fuel injection valve with a Zerstäubungssieb for the supply of internal combustion engines with fuel or fuel-gas mixtures known.
  • the sputtering sieve provides a protective shield against icing, plugging and deposits chemical substances inside the fuel injection valve represents.
  • 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 arranged Flammschutzsieb the Temperature of the flame front of the blowing mixture cloud reduced so much in the area of the injection openings, that no fuel precipitate on the valve seat body can, whereby a growth of the injection openings through Coking residue is avoided.
  • the flameproof screen is made of a Wire mesh produced by means of a Mounting ring is attached to the valve seat body.
  • the Flammtiksieb is also produced from a sheet, which by drilling, punching or etching with openings can be provided.
  • a further advantage is that the fastening ring the Flame protection screen in a direction of flow of the fuel surmounted axially, since thereby the flameproof screen before the in Combustion chamber is shielded and circulating flow Fuel can not precipitate on the flameproof screen.
  • 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 two Spray openings 7 has.
  • the valve closing body 4 of the inventively designed Fuel injection valve 1 has a nearly spherical Shape up. As a result, an offset-free, gimbaled Valve needle guide achieved for a precise Operation of the fuel injection valve 1 provides.
  • the valve seat body 5 of the fuel injection valve 1 is For example, cup-shaped and carries by his Form for valve needle guide at.
  • the valve seat body 5 is while in a spray-side recess 34 of the nozzle body 2 used and by means of a weld 35 with the Nozzle body 2 connected.
  • 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 fuel injection valve 1 at the Valve seat body 5, which in a recess 34 of the Nozzle body 2 arranged and for example by means of a Weld 35 is connected to this, a flameproof screen 37, which downstream of the ejection openings. 7 is attached by means of a fastening ring 38. It diminished by its arrangement downstream of the Spray holes 7 the coking tendency and bows so Malfunction of the fuel injection valve 1 by Clogging of the ejection openings 7 and an impermissible Reduction of the fuel flow before. Of the discharge-side part of the fuel injection valve 1 with the measures according to the invention is closer in Fig. 2 illustrated and explained.
  • 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 in an excerpted sectional view of the in Fig. 1 denoted by II section of the in Fig. 1st illustrated embodiment of an inventive designed fuel injection valve. 1
  • valve seat body 5 in the embodiment at a no further illustrated combustion chamber facing the outer end face 39 a fastening ring 38 through which a Flammtiksieb 37 on the downstream side of the Valve seat body 5 is fixed.
  • the fastening ring can doing so for example by means of a weld 40 am Valve seat body 5 to be fixed and relies on a Paragraph 43 of the valve seat body 5 from.
  • 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 screen 37 By attachment of the flameproof screen 37, 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 screen 37 which thus has the function of a flame retardant, prevents the spread of the flame front in the area between the flameproof screen 37 and the valve seat body 5.
  • the above mentioned flame retardance function of the Flammschutzsiebes 37 can by a corresponding Shape of the valve seat body 5 and the Mounting ring 38 are supported.
  • the Flammtiksieb closes, as already explained, the Exit region of the ejection openings 7 against the combustion chamber from, whereby a Abspritz Scheme 44 delimited against this becomes.
  • the mounting ring 38 is shaped so that it Shape of the valve seat body 5 in the region of the injection area 44 continues in Abspritzides, so that in total gives a funnel-shaped shape of the Abspritz Schemes.
  • attachment ring 38 projects beyond the flameproof screen 37 in the axial direction, so that in addition to the Flame retardant function of the flameproof screen 37 also the Mounting ring 38 a shielding function against the downstream end 42 of the fuel injection valve. 1 takes over, since he has the Flammtiksieb 37 against the Combustion chamber flows, which are tangent to the To circulate fuel injector 1 in the combustion chamber, shields.
  • the flameproof screen 37 preferably consists, as in FIG. 3 represented, from a network of metal wires, it is however, also conceivable, a correspondingly shaped sheet, such as shown in Fig. 4, e.g. by drilling, punching or Etching to provide openings.
  • the invention is not limited to those shown Embodiments limited and for any construction of fuel injection valves 1 applicable.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Fuel-Injection Apparatus (AREA)

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einem Brennstoffeinspritzventil nach der Gattung des Hauptanspruchs.The invention is based on a fuel injection valve according to the preamble of the main claim.

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.

Aus der WO 95/17595 A1 ist ein Brennstoffeinspritzventil mit einem Zerstäubungssieb zur Versorgung von Brennkraftmaschinen mit Brennstoff bzw. Brennstoff-Gas-Gemischen bekannt. Dabei stellt das Zerstäubungssieb ein Schutzschild gegen Vereisungen, Plugging und Ablagerungen chemischer Substanzen im Inneren des Brennstoffeinspritzventils dar. From WO 95/17595 A1 is a fuel injection valve with a Zerstäubungssieb for the supply of internal combustion engines with fuel or fuel-gas mixtures known. The sputtering sieve provides a protective shield against icing, plugging and deposits chemical substances inside the fuel injection valve represents.

Vorteile der ErfindungAdvantages of the invention

Das erfindungsgemäße Brennstoffeinspritzventil mit den kennzeichnenden Merkmalen des Hauptanspruchs hat demgegenüber den Vorteil, daß ein abströmseitig der Abspritzöffnungen angeordnetes Flammschutzsieb die Temperatur der Flammfront der durchbrennenden Gemischwolke im Bereich der Abspritzöffnungen so stark verringert, daß sich kein Brennstoff am Ventilsitzkörper niederschlagen kann, 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 arranged Flammschutzsieb the Temperature of the flame front of the blowing mixture cloud reduced so much in the area of the injection openings, that no fuel precipitate on the valve seat body can, whereby a growth of the injection openings through Coking residue is avoided.

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

Vorteilhafterweise ist das Flammschutzsieb aus einem Drahtgeflecht hergestellt, welches mittels eines Befestigungsrings am Ventilsitzkörper angebracht wird. Das Flammschutzsieb ist auch aus einem Blech herstellbar, welches mittels Bohren, Stanzen oder Ätzen mit Öffnungen versehen werden kann.Advantageously, the flameproof screen is made of a Wire mesh produced by means of a Mounting ring is attached to the valve seat body. The Flammschutzsieb is also produced from a sheet, which by drilling, punching or etching with openings can be provided.

Weiterhin ist von Vorteil, daß der Befestigungsring das Flammschutzsieb in einer Abströmrichtung des Brennstoffs axial überragt, da dadurch das Flammschutzsieb vor der im Brennraum zirkulierenden Strömung abgeschirmt ist und sich Brennstoff nicht am Flammschutzsieb niederschlagen kann.A further advantage is that the fastening ring the Flame protection screen in a direction of flow of the fuel surmounted axially, since thereby the flameproof screen before the in Combustion chamber is shielded and circulating flow Fuel can not precipitate on the flameproof screen.

Zeichnungdrawing

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung vereinfacht dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen:

Fig. 1
einen schematischen Schnitt durch ein Ausführungsbeispiel eines erfindungsgemäß ausgestalteten Brennstoffeinspritzventils in einer Gesamtansicht;
Fig. 2
einen schematischen Schnitt durch den abspritzseitigen Teil des in Fig. 1 dargestellten Ausführungsbeispiels des erfindungsgemäßen Brennstoffeinspritzventils im Bereich II in Fig. 1;
Fig. 3
eine Aufsicht auf das Flammschutzsieb mit Blickrichtung III in Fig. 2 und
Fig. 4
eine Aufsicht auf das Flammschutzsieb mit Blickrichtung IV in Fig. 2 entsprechend einem abgewandelten Ausführungsbeispiel.
An embodiment of the invention is shown in simplified form in the drawing and explained in more detail in the following description. Show it:
Fig. 1
a schematic section through an embodiment of an inventively designed fuel injection valve in an overall view;
Fig. 2
a schematic section through the discharge-side part of the embodiment shown in Figure 1 of the fuel injection valve according to the invention in area II in Fig. 1.
Fig. 3
a plan view of the flame screen with viewing direction III in Fig. 2 and
Fig. 4
a plan view of the flame screen with viewing direction IV in Fig. 2 according to a modified embodiment.

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. 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 zwei Abspritzöffnungen 7 verfügt. 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. In which Fuel injection valve 1 is in Embodiment to an inwardly opening Fuel injection valve 1, which over two Spray openings 7 has.

Der Ventilschließkörper 4 des erfindungsgemäß ausgestalteten Brennstoffeinspritzventils 1 weist eine nahezu kugelförmige Form auf. Dadurch wird eine versatzfreie, kardanische Ventilnadelführung erzielt, die für eine exakte Funktionsweise des Brennstoffeinspritzventils 1 sorgt.The valve closing body 4 of the inventively designed Fuel injection valve 1 has a nearly spherical Shape up. As a result, an offset-free, gimbaled Valve needle guide achieved for a precise Operation of the fuel injection valve 1 provides.

Der Ventilsitzkörper 5 des Brennstoffeinspritzventils 1 ist beispielsweise topfförmig ausgebildet und trägt durch seine Form zur Ventilnadelführung bei. Der Ventilsitzkörper 5 ist dabei in eine abspritzseitige Ausnehmung 34 des Düsenkörpers 2 eingesetzt und mittels einer Schweißnaht 35 mit dem Düsenkörper 2 verbunden.The valve seat body 5 of the fuel injection valve 1 is For example, cup-shaped and carries by his Form for valve needle guide at. The valve seat body 5 is while in a spray-side recess 34 of the nozzle body 2 used and by means of a weld 35 with the Nozzle body 2 connected.

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 und im Anker 20 verlaufen Brennstoffkanäle 30a und 30b. Der Brennstoff wird über eine zentrale Brennstoffzufuhr 16 zugeführt und durch ein Filterelement 25 gefiltert. Anschliffe 36 übernehmen im Bereich des Ventilsitzträgers 5 die Brennstoffzufuhr zum Dichtsitz. Das Brennstoffeinspritzventil 1 ist durch eine Dichtung 28 gegen eine nicht weiter dargestellte Verteilerleitung abgedichtet.Run in the valve needle guide 14 and the armature 20 Fuel channels 30a and 30b. The fuel gets over one supplied central fuel supply 16 and by a Filter element 25 filtered. Poles 36 take over in Area of the valve seat carrier 5, the fuel supply to Sealing seat. The fuel injection valve 1 is through a Seal 28 against a not shown Distribution pipe sealed.

Erfindungsgemäß weist das Brennstoffeinspritzventil 1 an dem Ventilsitzkörper 5, der in einer Ausnehmung 34 des Düsenkörpers 2 angeordnet und beispielsweise mittels einer Schweißnaht 35 mit diesem verbunden ist, ein Flammschutzsieb 37 auf, welches abströmseitig der Abspritzöffnungen 7 mittels eines Befestigungsrings 38 angebracht ist. Es 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. Der abspritzseitige Teil des Brennstoffeinspritzventils 1 mit den erfindungsgemäßen Maßnahmen ist in Fig. 2 näher dargestellt und erläutert.According to the invention, the fuel injection valve 1 at the Valve seat body 5, which in a recess 34 of the Nozzle body 2 arranged and for example by means of a Weld 35 is connected to this, a flameproof screen 37, which downstream of the ejection openings. 7 is attached by means of a fastening ring 38. It diminished by its arrangement downstream of the Spray holes 7 the coking tendency and bows so Malfunction of the fuel injection valve 1 by Clogging of the ejection openings 7 and an impermissible Reduction of the fuel flow before. Of the discharge-side part of the fuel injection valve 1 with the measures according to the invention is closer in Fig. 2 illustrated and explained.

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 auszugsweisen Schnittdarstellung den in Fig. 1 mit II bezeichneten Ausschnitt aus dem in Fig. 1 dargestellten Ausführungsbeispiel eines erfindungsgemäß ausgestalteten Brennstoffeinspritzventils 1.Fig. 2 shows in an excerpted sectional view of the in Fig. 1 denoted by II section of the in Fig. 1st illustrated embodiment of an inventive designed fuel injection valve. 1

Wie bereits in Fig. 1 angedeutet, weist der Ventilsitzkörper 5 im Ausführungsbeispiel an einer dem nicht weiter dargestellten Brennraum zugewandten äußeren Stirnseite 39 einen Befestigungsring 38 auf, durch welchen ein Flammschutzsieb 37 an der abströmseitigen Seite des Ventilsitzkörpers 5 fixiert ist. Der Befestigungsring kann dabei beispielsweise mittels einer Schweißnaht 40 am Ventilsitzkörper 5 fixiert sein und stützt sich an einem Absatz 43 des Ventilsitzkörpers 5 ab.As already indicated in Fig. 1, the valve seat body 5 in the embodiment at a no further illustrated combustion chamber facing the outer end face 39 a fastening ring 38 through which a Flammschutzsieb 37 on the downstream side of the Valve seat body 5 is fixed. The fastening ring can doing so for example by means of a weld 40 am Valve seat body 5 to be fixed and relies on a Paragraph 43 of the valve seat body 5 from.

Durch die Anordnung des Flammschutzsiebes 37 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 Flammschutzsiebes 37 kann die Oberflächentemperatur im Austrittsbereich der Abspritzöffnungen 7 so weit reduziert werden, daß die Abspritzöffnungen 7 nicht durch Verkokungsrückstände zuwachsen können. Das Flammschutzsieb 37, welches somit die Funktion eines Flammschutzes hat, verhindert dadurch die Ausbreitung der Flammfront im Bereich zwischen dem Flammschutzsieb 37 und dem Ventilsitzkörper 5.Due to the arrangement of the Flammschutzsiebes 37 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 screen 37, 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 screen 37, which thus has the function of a flame retardant, prevents the spread of the flame front in the area between the flameproof screen 37 and the valve seat body 5.

Die oben angesprochen Flammschutzfunktion des Flammschutzsiebes 37 kann durch eine entsprechende Formgebung des Ventilsitzkörpers 5 und des Befestigungsringes 38 unterstützt werden. Das Flammschutzsieb schließt, wie bereits erläutert, den Austrittsbereich der Abspritzöffnungen 7 gegen den Brennraum ab, wodurch ein Abspritzbereich 44 gegen diesen abgegrenzt wird. Der Befestigungsring 38 ist so geformt, daß er die Form des Ventilsitzkörpers 5 im Bereich des Abspritzbereichs 44 in Abspritzrichtung weiterführt, so daß sich insgesamt eine trichterförmige Form des Abspritzbereichs ergibt.The above mentioned flame retardance function of the Flammschutzsiebes 37 can by a corresponding Shape of the valve seat body 5 and the Mounting ring 38 are supported. The Flammschutzsieb closes, as already explained, the Exit region of the ejection openings 7 against the combustion chamber from, whereby a Abspritzbereich 44 delimited against this becomes. The mounting ring 38 is shaped so that it Shape of the valve seat body 5 in the region of the injection area 44 continues in Abspritzrichtung, so that in total gives a funnel-shaped shape of the Abspritzbereichs.

Zudem überragt der Befestigungsring 38 das Flammschutzsieb 37 in axialer Richtung, so daß zusätzlich zu der Flammschutzfunktion des Flammschutzsiebes 37 auch der Befestigungsring 38 eine abschirmende Funktion gegenüber dem abströmseitigen Ende 42 des Brennstoffeinspritzventils 1 übernimmt, da er das Flammschutzsieb 37 gegen die Brennraumströmungen, welche tangential zum Brennstoffeinspritzventil 1 im Brennraum zirkulieren, abschirmt.In addition, the attachment ring 38 projects beyond the flameproof screen 37 in the axial direction, so that in addition to the Flame retardant function of the flameproof screen 37 also the Mounting ring 38 a shielding function against the downstream end 42 of the fuel injection valve. 1 takes over, since he has the Flammschutzsieb 37 against the Combustion chamber flows, which are tangent to the To circulate fuel injector 1 in the combustion chamber, shields.

Das Flammschutzsieb 37 besteht vorzugsweise, wie in Fig. 3 dargestellt, aus einem Geflecht von Metalldrähten, es ist jedoch auch denkbar, ein entsprechend geformtes Blech, wie in Fig. 4 dargestellt, z.B. mittels Bohren, Stanzen oder Ätzen mit Öffnungen zu versehen.The flameproof screen 37 preferably consists, as in FIG. 3 represented, from a network of metal wires, it is However, also conceivable, a correspondingly shaped sheet, such as shown in Fig. 4, e.g. by drilling, punching or Etching to provide openings.

Die Erfindung ist nicht auf die dargestellten Ausführungsbeispiele beschränkt und für beliebige Bauweisen von Brennstoffeinspritzventilen 1 anwendbar.The invention is not limited to those shown Embodiments limited and for any construction of fuel injection valves 1 applicable.

Claims (8)

  1. Fuel injection valve (1) for the direct injection of fuel into a combustion space of an internal combustion engine, with an actuator (10), with a valve needle (3), actuable by the actuator (10), for the actuation of a valve-closing body (4) which, together with a valve-seat surface (6) formed on a valve-seat body (5), constitutes a sealing seat, and with at least one injection orifice (7) which is formed in the valve-seat body (5), characterized in that a flame protection screen (37) is arranged at an outflow-side end (42) of the fuel injection valve (1) and shields the injection orifices (7) with respect to the combustion space of the internal combustion engine, and in that the flame protection screen (37) is mounted at the outflow-side end of the fuel injection valve (1) by means of a fastening ring (38) which is shaped in such a way that it continues the shape of the valve-seat body (5) in the injection direction in the region of an injection region (44).
  2. Fuel injection valve according to Claim 1, characterized in that the fastening ring (38) is fixed to the valve-seat body (5) by means of a weld seam (40).
  3. Fuel injection valve according to Claim 1 or 2, characterized in that the flame protection screen (37) delimits with respect to the combustion space an injection region (44) located between the valve-seat carrier (5) and the flame protection screen (37).
  4. Fuel injection valve according to one of Claims 1 to 3, characterized in that the flame protection screen (37) consists of an intertwining of metal wires.
  5. Fuel injection valve according to one of Claims 1 to 3, characterized in that the flame protection screen (37) consists of a metal sheet with orifices introduced into the latter.
  6. Fuel injection valve according to Claim 5, characterized in that the orifices are introduced into the metal sheet by means of punching, drilling or etching.
  7. Fuel injection valve according to one of Claims 1 to 6, characterized in that the fastening ring (38) is supported on a step (43) of the valve-seat body (5).
  8. Fuel injection valve according to Claim 1 or 2, characterized in that the fastening ring (38) is shaped in such a way that it projects axially beyond the flame protection screen (37) in an outflow direction.
EP02742710A 2001-06-22 2002-05-07 Fuel-injection valve Expired - Lifetime EP1402176B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10130206 2001-06-22
DE10130206A DE10130206A1 (en) 2001-06-22 2001-06-22 Fuel injector
PCT/DE2002/001629 WO2003001053A1 (en) 2001-06-22 2002-05-07 Fuel-injection valve

Publications (2)

Publication Number Publication Date
EP1402176A1 EP1402176A1 (en) 2004-03-31
EP1402176B1 true EP1402176B1 (en) 2005-04-27

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EP02742710A Expired - Lifetime EP1402176B1 (en) 2001-06-22 2002-05-07 Fuel-injection valve

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US (1) US7014129B2 (en)
EP (1) EP1402176B1 (en)
JP (1) JP2004521254A (en)
KR (1) KR100853642B1 (en)
DE (2) DE10130206A1 (en)
WO (1) WO2003001053A1 (en)

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JP4511960B2 (en) * 2005-01-26 2010-07-28 株式会社ケーヒン Fuel injection valve
JP4502828B2 (en) * 2005-01-27 2010-07-14 株式会社ケーヒン Fuel injection valve
JP4502829B2 (en) * 2005-01-27 2010-07-14 株式会社ケーヒン Fuel injection valve
JP4490840B2 (en) * 2005-01-28 2010-06-30 株式会社ケーヒン Fuel injection valve
US20090057446A1 (en) * 2007-08-29 2009-03-05 Visteon Global Technologies, Inc. Low pressure fuel injector nozzle
US7669789B2 (en) * 2007-08-29 2010-03-02 Visteon Global Technologies, Inc. Low pressure fuel injector nozzle
US20090090794A1 (en) * 2007-10-04 2009-04-09 Visteon Global Technologies, Inc. Low pressure fuel injector
US9822969B2 (en) * 2010-11-30 2017-11-21 General Electric Company Fuel injector having tip cooling
JP5494824B2 (en) * 2010-12-20 2014-05-21 トヨタ自動車株式会社 Fuel injection valve
US20140116391A1 (en) * 2012-10-31 2014-05-01 Electro-Motive Diesel, Inc. Fuel system having an injector blocking member
JP5983795B2 (en) * 2015-02-09 2016-09-06 株式会社デンソー Fuel injection valve
DE102015225055A1 (en) * 2015-12-14 2017-06-14 Robert Bosch Gmbh fuel injector
DE102015226769A1 (en) * 2015-12-29 2017-06-29 Robert Bosch Gmbh Fuel injector
GB2552673B (en) * 2016-08-02 2020-02-19 Delphi Tech Ip Ltd SCR doser spray atomization
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WO2003001053A1 (en) 2003-01-03
DE10130206A1 (en) 2003-02-06
DE50202925D1 (en) 2005-06-02
JP2004521254A (en) 2004-07-15
KR100853642B1 (en) 2008-08-25
KR20030023760A (en) 2003-03-19
US7014129B2 (en) 2006-03-21
EP1402176A1 (en) 2004-03-31
US20040099243A1 (en) 2004-05-27

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