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EP1751420B1 - Fuel injection valve - Google Patents

Fuel injection valve Download PDF

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Publication number
EP1751420B1
EP1751420B1 EP05716755A EP05716755A EP1751420B1 EP 1751420 B1 EP1751420 B1 EP 1751420B1 EP 05716755 A EP05716755 A EP 05716755A EP 05716755 A EP05716755 A EP 05716755A EP 1751420 B1 EP1751420 B1 EP 1751420B1
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EP
European Patent Office
Prior art keywords
fuel injection
armature
injection valve
sleeve
valve according
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
EP05716755A
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German (de)
French (fr)
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EP1751420A1 (en
Inventor
Anh-Tuan Hoang
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
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Robert Bosch GmbH
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Filing date
Publication date
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Publication of EP1751420A1 publication Critical patent/EP1751420A1/en
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Publication of EP1751420B1 publication Critical patent/EP1751420B1/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
    • 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

Definitions

  • the invention relates to a fuel injection valve according to the preamble of claim 1.
  • the fuel injector includes an armature cooperating with a solenoid and a valve needle frictionally connected to the armature, to which is provided a valve closing body which, together with a valve seat surface, forms a sealing seat.
  • the valve needle has a first stop for the armature movable on it, wherein the armature is additionally acted upon by a second return spring. Furthermore, a stationary second stop for the armature is provided.
  • the second return spring acts on the armature counter to the stroke direction and holds in the non-energized state of the solenoid armature on the second stop so in abutment that the armature is spaced from the formed on the valve needle first stop by a predetermined distance.
  • a disadvantage of the from the DE 198 16 315 A1 known fuel injection valve is in particular that, although a Vorhubtex is realized, which allows an improvement of the valve dynamics when opening the fuel injector, when closing the fuel injection valve but anchor bumpers occur when the armature returns to the starting position, whereby further, unwanted opening strokes of the valve needle can be induced.
  • a fuel injection valve is already known, in particular for direct injection of fuel into the combustion chamber of a mixture-compression, spark-ignited internal combustion engine having an armature as part of an electromagnetic circuit which cooperates with a magnetic coil.
  • the valve further comprises a force-lockingly connected to the valve needle valve on which a valve closing body is provided, which forms a sealing seat together with a valve seat surface.
  • a pot-shaped axial extension is provided downstream, wherein a standing with the valve needle in frictional connection flange is disposed within the cup-shaped axial extension.
  • the armature is supported by a spring, which is arranged between the flange and the pot-shaped extension, swinging on the valve needle.
  • a Vorhubspalt is formed in each case within the cup-shaped axial extension, ie upon energization of the solenoid, the anchor is tightened and firmly connected to the anchor or one-piece extension strikes after passing through the Vorhubspaltes against the disposed within the extension flange must be prepared accordingly wear-resistant: This will immediately take the valve needle, which can lift in this way from the valve seat and open the valve.
  • the fuel injection valve according to the invention with the characterizing features of the main claim has the advantage that the armature is mounted by a spring arranged appropriately swinging on the valve needle and therefore a pre-stroke can take place during the opening process, but the armature can swing when closing against the valve needle, creating more Opening strokes of the valve needle can be avoided.
  • a further advantage is that the spring is formed in a simple manner as a helical spring and attached to the valve needle.
  • the spring is arranged between a standing with the valve needle in frictional engagement flange and a sleeve.
  • the sleeve encapsulates the spring and the flange.
  • a further advantage is that the sleeve can be produced in a simple manner and mounted in the fuel injection valve at the anchor.
  • a housing-fixed stop ring is provided, which serves as a lower anchor stop.
  • FIG. 1 illustrated embodiment of a fuel injection valve 1 according to the invention is carried out in the form of a fuel injection valve 1 for fuel injection systems of mixture-compression, spark-ignited internal combustion engines.
  • the fuel injection valve 1 is suitable in particular for the direct injection of fuel into a combustion chamber, not shown, 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 in operative connection with a valve closing body 4 which is connected to a valve seat body 5 arranged valve seat surface 6 cooperates to a sealing seat.
  • the fuel injection valve 1 in the exemplary embodiment is an inwardly opening fuel injection valve 1 which has an injection opening 7.
  • the nozzle body 2 is sealed by a seal 8 against an outer pole 9 of a magnetic coil 10.
  • the magnetic coil 10 is encapsulated in a coil housing 11 and wound on a bobbin 12, which rests against an inner pole 13 of the magnetic coil 10.
  • the inner pole 13 and the outer pole 9 are separated by a constriction 26 and connected to each other by a non-ferromagnetic connecting member 29.
  • the magnetic coil 10 is energized via a line 19 from a via an electrical plug contact 17 can be supplied with electric current.
  • the plug contact 17 is surrounded by a plastic casing 18, which may be molded on the inner pole 13.
  • an armature 20 is movably arranged on the valve needle 3 on the valve needle 3, an armature 20 is movably arranged. This is spaced from a first flange 21, which is non-positively connected to the valve needle 3 by a weld 22, by a pre-stroke gap 27. On the first flange 21, a return spring 23 is supported, which is brought in the present design of the fuel injection valve 1 by a sleeve 24 to bias. Between a lower stop surface of the inner pole 13 and the armature 20, a working air gap 33 is formed.
  • armature 20 and on a guide member 36 extend fuel channels 30 and 32.
  • the fuel is supplied via a central fuel supply 16 and filtered by a filter element 25.
  • the fuel injection valve 1 is sealed by a seal 28 against a fuel distributor line, not shown, and by a further seal 37 against a cylinder head, not shown.
  • a second flange 34 is arranged, which is also connected via a weld 35 frictionally connected to the valve needle 3.
  • a pot-shaped sleeve 14 is provided downstream of the armature 20 and in fixed connection therewith, in which a spring 31 is arranged, which is supported between the sleeve 14 and the second flange 34.
  • a housing-fixed stop ring 38 serves as a downstream anchor stop.
  • valve needle 3 In the idle state of the fuel injection valve 1, the valve needle 3 is acted upon by the return spring 23 against its stroke direction so that the valve closing body 4 is held on the valve seat surface 6 in sealing engagement. Upon energization of the magnetic coil 10, this builds up a magnetic field, which initially moves the armature 20 counter to the spring force of the spring 31 in the stroke direction, wherein the prestroke or the Ankerkeweg by a in the rest position between the first flange 21 and the armature 20 located Vorhubspalt 27th is predetermined.
  • the armature 20 After passing through the preliminary stroke of the armature 20 is pulled against the force of the return spring 23 to the inner pole 13 of the magnetic coil 10, the armature 20 carries the first flange 21, which is welded to the valve needle 3, whereby this is also taken in the stroke direction.
  • the valve closing body 4 communicating with the valve needle 3 lifts off the valve seat surface 6, and the fuel guided via the fuel channels 30 and 32 is sprayed through the injection opening 7.
  • the armature 20 drops after sufficient degradation of the magnetic field by the pressure of the return spring 23 from the inner pole 13, whereby the valve connected to the needle 3 in communication first flange 21 moves against the stroke direction.
  • the valve needle 3 is thereby moved in the same direction, whereby the valve closing body 4 touches on the valve seat surface 6 and the fuel injection valve 1 is closed.
  • the sleeve 14 is simultaneously on the housing-fixed stop ring 38.
  • the armature 20 is arranged freely swinging on the valve needle 3. So-called first-order armature bounters are avoided by preventing the armature 20 from hitting the flange 34 during the movement in the closing direction during the closing movement of the fuel injection valve 1. He is instead intercepted by the stop ring 38. The armature 20 is thus braked during the closing movement by the spring 31. At the same time the Vorhubzin, which allows an improvement of the opening dynamics of the fuel injection valve 1, also implemented.
  • the sleeve 14 is fixedly connected to the armature 20 via a collar 39, for example by welding, soldering or gluing.
  • the stop ring 38 is fixed to the housing, for example by pressing or welding to the outer pole 9 of the fuel injection valve. 1

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

Description

Die Erfindung geht aus von einem Brennstoffeinspritzventil nach der Gattung des Anspruchs 1.The invention relates to a fuel injection valve according to the preamble of claim 1.

Beispielsweise ist aus der DE 198 16 315 A1 ein Brennstoffeinspritzventil insbesondere zum direkten Einspritzen von Brennstoff in den Brennraum einer Brennkraftmaschine bekannt. Das Brennstoffeinspritzventil umfaßt einen Anker, der mit einer Magnetspule zusammenwirkt, und eine kraftschlüssig mit dem Anker verbundene Ventilnadel, an der ein Ventilschließkörper vorgesehen ist, der zusammen mit einer Ventilsitzfläche einen Dichtsitz bildet. Die Ventilnadel weist einen ersten Anschlag für den auf ihr beweglichen Anker auf, wobei der Anker zusätzlich durch eine zweite Rückstellfeder beaufschlagt ist. Ferner ist ein stationärer zweiter Anschlag für den Anker vorgesehen. Die zweite Rückstellfeder beaufschlagt den Anker entgegen der Hubrichtung und hält in nicht erregtem Zustand der Magnetspule den Anker am zweiten Anschlag so in Anlage, daß der Anker von dem an der Ventilnadel ausgebildeten ersten Anschlag um einen vorgegebenen Abstand beabstandet ist.For example, is from the DE 198 16 315 A1 a fuel injection valve in particular for the direct injection of fuel into the combustion chamber of an internal combustion engine known. The fuel injector includes an armature cooperating with a solenoid and a valve needle frictionally connected to the armature, to which is provided a valve closing body which, together with a valve seat surface, forms a sealing seat. The valve needle has a first stop for the armature movable on it, wherein the armature is additionally acted upon by a second return spring. Furthermore, a stationary second stop for the armature is provided. The second return spring acts on the armature counter to the stroke direction and holds in the non-energized state of the solenoid armature on the second stop so in abutment that the armature is spaced from the formed on the valve needle first stop by a predetermined distance.

Nachteilig an dem aus der DE 198 16 315 A1 bekannten Brennstoffeinspritzventil ist insbesondere, daß zwar ein Vorhubprinzip realisiert ist, welches eine Verbesserung der Ventildynamik beim Öffnen des Brennstoffeinspritzventils ermöglicht, beim Schließen des Brennstoffeinspritzventils jedoch Ankerpreller auftreten, wenn der Anker in die Ausgangslage zurückkehrt, wodurch weitere, unerwünschte Öffnungshübe der Ventilnadel induziert werden.A disadvantage of the from the DE 198 16 315 A1 known fuel injection valve is in particular that, although a Vorhubprinzip is realized, which allows an improvement of the valve dynamics when opening the fuel injector, when closing the fuel injection valve but anchor bumpers occur when the armature returns to the starting position, whereby further, unwanted opening strokes of the valve needle can be induced.

Aus der DE 100 39 077 A1 ist bereits ein Brennstoffeinspritzventil insbesondere zum direkten Einspritzen von Brennstoff in den Brennraum einer gemischverdichtenden, fremdgezündeten Brennkraftmaschine bekannt, das einen Anker als Teil eines elektromagnetischen Kreises besitzt, der mit einer Magnetspule zusammenwirkt. Das Ventil umfasst des weiteren eine mit dem Anker kraftschlüssig verbundene Ventilnadel, an der ein Ventilschließkörper vorgesehen ist, der zusammen mit einer Ventilsitzfläche einen Dichtsitz bildet. Am Anker ist abströmseitig ein topfförmiger axialer Fortsatz vorgesehen, wobei ein mit der Ventilnadel in kraftschlüssiger Verbindung stehender Flansch innerhalb des topfförmigen axialen Fortsatzes angeordnet ist. Der Anker ist durch eine Feder, die zwischen dem Flansch und dem topfförmigen Fortsatz angeordnet ist, schwingend auf der Ventilnadel gelagert. Bei diesen bekannten Ausführungsformen der Brennstoffeinspritzventile ist ein Vorhubspalt jeweils innerhalb des topfförmigen axialen Fortsatzes ausgebildet, d.h. bei Erregung der Magnetspule wird der Anker angezogen und der mit dem Anker fest verbunden bzw. einteilige Fortsatz schlägt nach Durchlaufen des Vorhubspaltes gegen den innerhalb des Fortsatzes angeordneten Flansch, die entsprechend verschleißfest präpariert sein müssen: Dadurch wird unmittelbar die Ventilnadel mitgenommen, die auf diese Weise vom Ventilsitz abheben und das Ventil öffnen kann.From the DE 100 39 077 A1 For example, a fuel injection valve is already known, in particular for direct injection of fuel into the combustion chamber of a mixture-compression, spark-ignited internal combustion engine having an armature as part of an electromagnetic circuit which cooperates with a magnetic coil. The valve further comprises a force-lockingly connected to the valve needle valve on which a valve closing body is provided, which forms a sealing seat together with a valve seat surface. At the anchor a pot-shaped axial extension is provided downstream, wherein a standing with the valve needle in frictional connection flange is disposed within the cup-shaped axial extension. The armature is supported by a spring, which is arranged between the flange and the pot-shaped extension, swinging on the valve needle. In these known embodiments of the fuel injection valves, a Vorhubspalt is formed in each case within the cup-shaped axial extension, ie upon energization of the solenoid, the anchor is tightened and firmly connected to the anchor or one-piece extension strikes after passing through the Vorhubspaltes against the disposed within the extension flange must be prepared accordingly wear-resistant: This will immediately take the valve needle, which can lift in this way from the valve seat and open the valve.

Vorteile der ErfindungAdvantages of the invention

Das erfindungsgemäße Brennstoffeinspritzventil mit den kennzeichnenden Merkmalen des Hauptanspruchs hat demgegenüber den Vorteil, daß der Anker durch eine entsprechend angeordnete Feder schwingend auf der Ventilnadel gelagert ist und daher beim Öffnungsvorgang ein Vorhub stattfinden kann, der Anker beim Schließen jedoch gegenüber der Ventilnadel durchschwingen kann, wodurch weitere Öffnungshübe der Ventilnadel vermieden werden können.The fuel injection valve according to the invention with the characterizing features of the main claim has the advantage that the armature is mounted by a spring arranged appropriately swinging on the valve needle and therefore a pre-stroke can take place during the opening process, but the armature can swing when closing against the valve needle, creating more Opening strokes of the valve needle can be avoided.

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

Weiterhin ist von Vorteil, daß die Feder in einfacher Weise als Schraubenfeder ausgebildet und auf die Ventilnadel aufgesteckt ist.A further advantage is that the spring is formed in a simple manner as a helical spring and attached to the valve needle.

Vorteilhafterweise ist die Feder zwischen einem mit der Ventilnadel in Kraftschluß stehenden Flansch und einer Hülse angeordnet. Die Hülse kapselt die Feder und den Flansch dabei.Advantageously, the spring is arranged between a standing with the valve needle in frictional engagement flange and a sleeve. The sleeve encapsulates the spring and the flange.

Von Vorteil ist weiterhin, daß die Hülse in einfacher Weise herstellbar und in dem Brennstoffeinspritzventil am Anker montierbar ist.A further advantage is that the sleeve can be produced in a simple manner and mounted in the fuel injection valve at the anchor.

Weiterhin ist vorteilhaft, daß ein gehäusefester Anschlagring vorgesehen ist, der als unterer Ankeranschlag dient.Furthermore, it is advantageous that a housing-fixed stop ring is provided, which serves as a lower anchor stop.

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 und
Fig. 2
einen vergrößerten Ausschnitt aus dem in Fig. 1 dargestellten Ausführungsbeispiel eines erfindungsgemäßen Brennstoffeinspritzventils im Bereich II in Fig. 1.
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 injector and
Fig. 2
an enlarged section of the in Fig. 1 illustrated embodiment of a fuel injection valve according to the invention in the area II in Fig. 1 ,

Beschreibung des AusführungsbeispielsDescription of the embodiment

Nachfolgend wird ein Ausführungsbeispiel der Erfindung beispielhaft beschrieben. Übereinstimmende Bauteile sind dabei in allen Figuren mit übereinstimmenden Bezugszeichen versehen.Hereinafter, an embodiment of the invention will be described by way of example. Matching components are provided in all figures with matching reference numerals.

Ein in Fig. 1 dargestelltes Ausführungsbeispiel eines erfindungsgemäßen Brennstoffeinspritzventils 1 ist in der Form eines Brennstoffeinspritzventils 1 für Brennstoffeinspritzanlagen von gemischverdichtenden, fremdgezündeten Brennkraftmaschinen ausgeführt. Das Brennstoffeinspritzventil 1 eignet sich insbesondere zum direkten Einspritzen von Brennstoff in einen nicht dargestellten Brennraum einer Brennkraftmaschine.An in Fig. 1 illustrated embodiment of a fuel injection valve 1 according to the invention is carried out in the form of a fuel injection valve 1 for fuel injection systems of mixture-compression, spark-ignited internal combustion engines. The fuel injection valve 1 is suitable in particular for the direct injection of fuel into a combustion chamber, not shown, of an internal combustion engine.

Das Brennstoffeinspritzventil 1 besteht aus einem Düsenkörper 2, in welchem eine Ventilnadel 3 angeordnet ist. Die Ventilnadel 3 steht mit einem Ventilschließkörper 4 in Wirkverbindung, 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 eine Abspritzöffnung 7 verfügt. Der Düsenkörper 2 ist durch eine Dichtung 8 gegen einen Außenpol 9 einer 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 eine Verengung 26 voneinander getrennt und miteinander durch ein nicht ferromagnetisches Verbindungsbauteil 29 verbunden. 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 fuel injection valve 1 consists of a nozzle body 2, in which a valve needle 3 is arranged. The valve needle 3 is in operative connection with a valve closing body 4 which is connected to a valve seat body 5 arranged valve seat surface 6 cooperates to a sealing seat. The fuel injection valve 1 in the exemplary embodiment is an inwardly opening fuel injection valve 1 which has an injection opening 7. The nozzle body 2 is sealed by a seal 8 against an outer pole 9 of a magnetic coil 10. The magnetic coil 10 is encapsulated in a coil housing 11 and wound on a bobbin 12, which rests against an inner pole 13 of the magnetic coil 10. The inner pole 13 and the outer pole 9 are separated by a constriction 26 and connected to each other by a non-ferromagnetic connecting member 29. The magnetic coil 10 is energized via a line 19 from a via an electrical plug contact 17 can be supplied with electric current. The plug contact 17 is surrounded by a plastic casing 18, which may be molded on the inner pole 13.

Auf der Ventilnadel 3 ist ein Anker 20 beweglich angeordnet. Dieser ist von einem ersten Flansch 21, welcher durch eine Schweißnaht 22 kraftschlüssig mit der Ventilnadel 3 in Verbindung steht, durch einen Vorhubspalt 27 beabstandet. 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. Zwischen einer unteren Anschlagfläche des Innenpols 13 und dem Anker 20 ist ein Arbeitsluftspalt 33 ausgebildet.On the valve needle 3, an armature 20 is movably arranged. This is spaced from a first flange 21, which is non-positively connected to the valve needle 3 by a weld 22, by a pre-stroke gap 27. On the first flange 21, a return spring 23 is supported, which is brought in the present design of the fuel injection valve 1 by a sleeve 24 to bias. Between a lower stop surface of the inner pole 13 and the armature 20, a working air gap 33 is formed.

Im Anker 20 und an einem Führungselement 36 verlaufen Brennstoffkanäle 30 und 32. 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 Brennstoffverteilerleitung und durch eine weitere Dichtung 37 gegen einen nicht weiter dargestellten Zylinderkopf abgedichtet.In the armature 20 and on a guide member 36 extend fuel channels 30 and 32. The fuel is supplied via a central fuel supply 16 and filtered by a filter element 25. The fuel injection valve 1 is sealed by a seal 28 against a fuel distributor line, not shown, and by a further seal 37 against a cylinder head, not shown.

An der abspritzseitigen Seite des Ankers 20 ist ein zweiter Flansch 34 angeordnet, welcher ebenfalls über eine Schweißnaht 35 kraftschlüssig mit der Ventilnadel 3 verbunden ist.On the discharge side of the armature 20, a second flange 34 is arranged, which is also connected via a weld 35 frictionally connected to the valve needle 3.

Erfindungsgemäß ist eine topfartig ausgebildete Hülse 14 abströmseitig des Ankers 20 und in fester Verbindung mit diesem vorgesehen, in welcher eine Feder 31 angeordnet ist, welche sich zwischen der Hülse 14 und dem zweiten Flansch 34 abstützt. Ein gehäusefester Anschlagring 38 dient als abströmseitiger Ankeranschlag. Die erfindungsgemäßen Maßnahmen werden weiter unten unter Bezugnahme auf Fig. 2 näher erläutert.According to the invention, a pot-shaped sleeve 14 is provided downstream of the armature 20 and in fixed connection therewith, in which a spring 31 is arranged, which is supported between the sleeve 14 and the second flange 34. A housing-fixed stop ring 38 serves as a downstream anchor stop. The measures according to the invention are described below with reference to Fig. 2 explained in more detail.

Im Ruhezustand des Brennstoffeinspritzventils 1 wird die Ventilnadel 3 von der Rückstellfeder 23 entgegen ihrer Hubrichtung so beaufschlagt, daß der Ventilschließkörper 4 an der Ventilsitzfläche 6 in dichtender Anlage gehalten wird. Bei Erregung der Magnetspule 10 baut diese ein Magnetfeld auf, welches den Anker 20 zunächst entgegen der Federkraft der Feder 31 in Hubrichtung bewegt, wobei der Vorhub bzw. der Ankerfreiweg durch einen in der Ruhestellung zwischen dem ersten Flansch 21 und dem Anker 20 befindlichen Vorhubspalt 27 vorgegeben ist. Nach Durchlaufen des Vorhubs wird der Anker 20 entgegen der Kraft der Rückstellfeder 23 an den Innenpol 13 der Magnetspule 10 gezogen, wobei der Anker 20 den ersten Flansch 21 mitnimmt, welcher mit der Ventilnadel 3 verschweißt ist, wodurch diese ebenfalls in Hubrichtung mitgenommen wird. Der mit der Ventilnadel 3 in Verbindung stehende Ventilschließkörper 4 hebt von der Ventilsitzfläche 6 ab, und der über die Brennstoffkanäle 30 und 32 geführte Brennstoff wird durch die Abspritzöffnung 7 abgespritzt.In the idle state of the fuel injection valve 1, the valve needle 3 is acted upon by the return spring 23 against its stroke direction so that the valve closing body 4 is held on the valve seat surface 6 in sealing engagement. Upon energization of the magnetic coil 10, this builds up a magnetic field, which initially moves the armature 20 counter to the spring force of the spring 31 in the stroke direction, wherein the prestroke or the Ankerfreiweg by a in the rest position between the first flange 21 and the armature 20 located Vorhubspalt 27th is predetermined. After passing through the preliminary stroke of the armature 20 is pulled against the force of the return spring 23 to the inner pole 13 of the magnetic coil 10, the armature 20 carries the first flange 21, which is welded to the valve needle 3, whereby this is also taken in the stroke direction. The valve closing body 4 communicating with the valve needle 3 lifts off the valve seat surface 6, and the fuel guided via the fuel channels 30 and 32 is sprayed through the injection opening 7.

Wird der Spulenstrom abgeschaltet, fällt der Anker 20 nach genügendem Abbau des Magnetfeldes durch den Druck der Rückstellfeder 23 vom Innenpol 13 ab, wodurch sich der mit der Ventilnadel 3 in Verbindung stehende erste Flansch 21 entgegen der Hubrichtung bewegt. Die Ventilnadel 3 wird dadurch in die gleiche Richtung bewegt, wodurch der Ventilschließkörper 4 auf der Ventilsitzfläche 6 aufsetzt und das Brennstoffeinspritzventil 1 geschlossen wird. Die Hülse 14 setzt gleichzeitig auf dem gehäusefesten Anschlagring 38 auf.If the coil current is turned off, the armature 20 drops after sufficient degradation of the magnetic field by the pressure of the return spring 23 from the inner pole 13, whereby the valve connected to the needle 3 in communication first flange 21 moves against the stroke direction. The valve needle 3 is thereby moved in the same direction, whereby the valve closing body 4 touches on the valve seat surface 6 and the fuel injection valve 1 is closed. The sleeve 14 is simultaneously on the housing-fixed stop ring 38.

Bedingt durch die zweite Feder 31, welche, wie aus Fig. 2 ersichtlich, zwischen dem zweiten Flansch 34 und einem Bodenteil 40 der Hülse 14 angeordnet ist, ist der Anker 20 frei schwingend auf der Ventilnadel 3 angeordnet. Sogenannte Ankerpreller erster Ordnung werden dadurch vermieden, daß bei der Schließbewegung des Brennstoffeinspritzventils 1 verhindert wird, daß der Anker 20 bei der Bewegung in Schließrichtung auf dem Flansch 34 aufschlägt. Er wird statt dessen durch den Anschlagring 38 abgefangen. Der Anker 20 wird also während der Schließbewegung durch die Feder 31 gebremst. Gleichzeitig ist das Vorhubprinzip, welches eine Verbesserung der Öffnungsdynamik des Brennstoffeinspritzventils 1 ermöglicht, ebenfalls umgesetzt.Due to the second spring 31, which, as out Fig. 2 can be seen, between the second flange 34 and a bottom portion 40 of the sleeve 14 is disposed, the armature 20 is arranged freely swinging on the valve needle 3. So-called first-order armature bounters are avoided by preventing the armature 20 from hitting the flange 34 during the movement in the closing direction during the closing movement of the fuel injection valve 1. He is instead intercepted by the stop ring 38. The armature 20 is thus braked during the closing movement by the spring 31. At the same time the Vorhubprinzip, which allows an improvement of the opening dynamics of the fuel injection valve 1, also implemented.

Die Hülse 14 ist mit dem Anker 20 über einen Kragen 39 fest verbunden, beispielsweise durch Schweißen, Löten oder Kleben. Der Anschlagring 38 ist gehäusefest montiert, etwa durch Einpressen oder Verschweißen mit dem Außenpol 9 des Brennstoffeinspritzventils 1.The sleeve 14 is fixedly connected to the armature 20 via a collar 39, for example by welding, soldering or gluing. The stop ring 38 is fixed to the housing, for example by pressing or welding to the outer pole 9 of the fuel injection valve. 1

Die Erfindung ist nicht auf das dargestellte Ausführungsbeispiel beschränkt und auch für andere Formen von Brennstoffeinspritzventilen 1 gemäß den Ansprüchen anwendbar.The invention is not limited to the illustrated embodiment and also applicable to other forms of fuel injection valves 1 according to the claims.

Claims (11)

  1. Fuel injection valve (1), in particular for the direct injection of fuel into the combustion space of a mixture-compressing spark-ignition internal combustion engine, with an armature (20) which cooperates with a magnet coil (10), and with a valve needle (3), which is connected non-positively to the armature (20), on which is provided a valve-closing body (4) which together with a valve-seat surface (6) forms a sealing seat, a sleeve (14) being arranged downstream of the armature (20), and a second flange (34) connected non-positively to the valve needle (3) being arranged within the sleeve (14), and the armature (20) being mounted in an oscillating manner on the valve needle (3) by means of a spring (31) arranged between the second flange (34) and the sleeve (14), characterized in that, upstream of the armature (20), a first flange (21) is arranged which is connected non-positively to the valve needle (3) and between which and the armature (20) a prestroke gap (27) is formed in the dead state of the magnet coil (10).
  2. Fuel injection valve according to Claim 1, characterized in that the sleeve (14) is of pot-shaped design with a collar (39).
  3. Fuel injection valve according to Claim 2, characterized in that the sleeve (14) is welded to the armature (20) via the collar (39).
  4. Fuel injection valve according to one of Claims 1 to 3, characterized in that the valve needle (3) passes through the sleeve (14) in a bottom part (40).
  5. Fuel injection valve according to Claim 1, characterized in that the valve needle (3) passes through the spring (31).
  6. Fuel injection valve according to Claim 1, characterized in that the spring (31) is designed as a helical spring (31).
  7. Fuel injection valve according to one of Claims 1 to 6, characterized in that a stop ring (38) is arranged, downstream of the sleeve (14), in the fuel injection valve (1).
  8. Fuel injection valve according to Claim 7, characterized in that the stop ring (38) is fixed to the housing.
  9. Fuel injection valve according to Claim 7 or 8, characterized in that the sleeve (14) bears against the stop ring (38) in the dead state of the magnet coil (10).
  10. Fuel injection valve according to one of Claims 1 to 9, characterized in that a working air gap (33) is formed between the armature (20) and an inner pole (13) of the magnet coil (10).
  11. Fuel injection valve according to Claim 2 or 3, characterized in that the flange (34) and the armature (20) are spaced apart by a clearance in the thickness of the collar (39) of the sleeve (14).
EP05716755A 2004-05-18 2005-02-21 Fuel injection valve Expired - Lifetime EP1751420B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004024533A DE102004024533A1 (en) 2004-05-18 2004-05-18 Fuel injector
PCT/EP2005/050743 WO2005113973A1 (en) 2004-05-18 2005-02-21 Fuel injection valve

Publications (2)

Publication Number Publication Date
EP1751420A1 EP1751420A1 (en) 2007-02-14
EP1751420B1 true EP1751420B1 (en) 2009-10-28

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EP05716755A Expired - Lifetime EP1751420B1 (en) 2004-05-18 2005-02-21 Fuel injection valve

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US (1) US8528842B2 (en)
EP (1) EP1751420B1 (en)
JP (1) JP4243610B2 (en)
DE (2) DE102004024533A1 (en)
WO (1) WO2005113973A1 (en)

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Publication number Publication date
JP2008506875A (en) 2008-03-06
DE502005008412D1 (en) 2009-12-10
US8528842B2 (en) 2013-09-10
JP4243610B2 (en) 2009-03-25
DE102004024533A1 (en) 2005-12-15
WO2005113973A1 (en) 2005-12-01
EP1751420A1 (en) 2007-02-14
US20080277505A1 (en) 2008-11-13

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