EP1751420A1 - Fuel injection valve - Google Patents

Fuel injection valve

Info

Publication number
EP1751420A1
EP1751420A1 EP05716755A EP05716755A EP1751420A1 EP 1751420 A1 EP1751420 A1 EP 1751420A1 EP 05716755 A EP05716755 A EP 05716755A EP 05716755 A EP05716755 A EP 05716755A EP 1751420 A1 EP1751420 A1 EP 1751420A1
Authority
EP
European Patent Office
Prior art keywords
fuel injection
injection valve
armature
valve according
sleeve
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.)
Granted
Application number
EP05716755A
Other languages
German (de)
French (fr)
Other versions
EP1751420B1 (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
Original Assignee
Robert Bosch GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1751420A1 publication Critical patent/EP1751420A1/en
Application granted granted Critical
Publication of EP1751420B1 publication Critical patent/EP1751420B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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 injector according to the preamble of claim 1.
  • a fuel injection valve is known in particular for the direct injection of fuel into the combustion chamber of an internal combustion engine.
  • the fuel injection valve comprises an armature, which cooperates with a solenoid coil, and a valve needle which is positively connected to the armature and on which a Valve closing body is provided, which forms a sealing seat together with a valve seat surface.
  • the valve needle has a first stop for the armature movable on it, the armature being additionally acted upon by a second return spring.
  • a stationary second stop for the armature is also provided.
  • the second return spring acts on the armature counter to the stroke direction and holds the armature against the second stop in the non-energized state of the solenoid so that the armature is spaced from the first stop formed on the valve needle by a predetermined distance.
  • a disadvantage of the fuel injector known from DE 198 16 315 AI is, in particular, that although a pre-stroke principle is implemented which enables an improvement in the valve dynamics when the fuel injector is opened, armature bumps occur when the fuel injector closes when the armature returns to the starting position, which means that further undesired opening strokes of the valve needle are induced.
  • the fuel injector according to the invention with the characterizing features of the main claim has the advantage that the armature is mounted swinging on the valve needle by a correspondingly arranged spring and therefore a preliminary stroke can take place during the opening process, but the armature can swing through when closing relative to the valve needle, which means that more Opening strokes of the valve needle can be avoided.
  • the spring is designed in a simple manner as a helical spring and is attached to the valve needle.
  • the spring is advantageously arranged between a flange which is non-positively connected to the valve needle and a sleeve.
  • the sleeve encapsulates the spring and the flange.
  • the sleeve can be produced in a simple manner and mounted on the armature in the fuel injection valve. It is also advantageous that a stop ring fixed to the housing is provided which serves as the lower anchor stop.
  • Fig. 1 shows a schematic section through an embodiment of a fuel injector designed according to the invention
  • FIG. 2 shows an enlarged detail from the exemplary embodiment of a fuel injector according to the invention shown in FIG. 1 in area II in FIG. 1.
  • FIG. 1 An exemplary embodiment of a fuel injection valve 1 according to the invention shown in FIG. 1 is in the form of a fuel injection valve 1 for fuel injection systems of mixture-compressing, spark-ignited internal combustion engines.
  • the fuel injection valve 1 is particularly suitable for injecting fuel directly 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 operatively connected to a valve closing body 4, which is connected to a valve seat body 5 arranged valve seat surface 6 cooperates to form a sealing seat.
  • the fuel injection valve 1 is a fuel injection valve 1 that opens inwards and has a spray opening 7.
  • the nozzle body 2 is sealed by a seal 8 against an outer pole 9 of a solenoid 10.
  • the magnet coil 10 is encapsulated in a coil housing 11 and wound on a coil carrier 12 which bears against an inner pole 13 of the magnet coil 10.
  • the inner pole 13 and the outer pole 9 are separated from one another by a constriction 26 and connected to one another by a non-ferromagnetic connecting component 29.
  • the magnet coil 10 is excited via a line 19 by an electrical current that can be supplied via an electrical plug contact 17.
  • the plug contact 17 is surrounded by a plastic sheath 18, which can be molded onto the inner pole 13.
  • An armature 20 is movably arranged on the valve needle 3. This is spaced from a first flange 21, which is non-positively connected to the valve needle 3 by means of a weld seam 22, by a preliminary stroke gap 27.
  • a return spring 23 is supported on the first flange 21, which in the present design of the fuel injection valve 1 is preloaded by a sleeve 24.
  • a working air gap 33 is formed between a lower stop surface of the inner pole 13 and the armature 20.
  • Fuel channels 30 and 32 run in the armature 20 and on a guide element 36.
  • the fuel is supplied via a central fuel supply 16 and filtered by a filter element 25.
  • the fuel injector 1 is sealed by a seal 28 against a fuel rail, not shown, and by a further seal 37, against a cylinder head, not shown.
  • a second flange 34 is arranged on the spray-side side of the armature 20, which is also non-positively connected to the valve needle 3 via a weld seam 35.
  • a cup-shaped sleeve 14 is provided on the outflow side 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 stop ring 38 fixed to the housing serves as an anchor stop on the downstream side.
  • the 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 in such a way that the valve closing body 4 is held in sealing contact with the valve seat surface 6.
  • the magnet coil 10 When the magnet coil 10 is excited, it builds up a magnetic field, which initially moves the armature 20 in the stroke direction against the spring force of the spring 31, the preliminary stroke or the armature free travel being achieved by a preliminary stroke gap 27 located in the rest position between the first flange 21 and the armature 20 is specified.
  • the armature 20 After passing through the forward stroke, the armature 20 is pulled against the force of the return spring 23 to the inner pole 13 of the magnet coil 10, the armature 20 taking along the first flange 21, which is welded to the valve needle 3, whereby this is also carried in the stroke direction.
  • the valve closing body 4, which is connected to the valve needle 3, lifts off the valve seat surface 6, and the fuel guided via the fuel channels 30 and 32 is sprayed off through the spray opening 7.
  • the armature 20 drops from the inner pole 13 after the magnetic field has been sufficiently reduced by the pressure of the return spring 23, as a result of which the first flange 21, which is connected to the valve needle 3, moves counter to the stroke direction.
  • the valve needle 3 will thereby moved in the same direction, whereby the valve closing body 4 rests on the valve seat surface 6 and the fuel injector 1 is closed.
  • the sleeve 14 is at the same time on the housing-fixed stop ring 38.
  • the armature 20 is arranged on the valve needle 3 in a freely swinging manner. So-called first order anchor bumpers are avoided by preventing the armature 20 from striking the flange 34 during the closing direction of the fuel injector 1 during the closing movement. Instead, it is intercepted by the stop ring 38. The armature 20 is therefore braked by the spring 31 during the closing movement. At the same time, the pre-stroke principle, which enables the opening dynamics of fuel injector 1 to be improved, is also implemented.
  • the sleeve 14 is connected to the armature 20 via a collar 39 fixed, '- for example by welding, soldering' -or gluing.
  • the stop ring 38 is fixed to the housing, for example by being pressed in or welded to the outer pole 9 of the fuel injection valve 1.
  • the invention is not limited to the exemplary embodiment shown and can also be used for other forms of fuel injection valves 1.

Landscapes

  • 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)

Abstract

A fuel injection valve (1), particularly for directly injecting fuel into the combustion chamber of a mixture-compressing, spark-ignition internal combustion engine, comprises an armature (20), which interacts with solenoid (10), and comprises a valve needle (3), which is non-positively connected to the armature (20) and on which a valve closing body (4) is provided that, together with a valve seat face (6), forms a sealing seat. The armature (20) is mounted in an oscillating manner on the valve needle (3) by means of spring (31).

Description

Brennstoffeinspritzventil Fuel injector
Stand der TechnikState of the art
Die Erfindung geht aus von einem Brennstoffeinspritzventil nach der Gattung des Anspruchs 1.The invention relates to a fuel injector according to the preamble of claim 1.
Beispielsweise ist aus der DE 198 16 315 AI 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 kraf schlüssig 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. Nachteilig an dem aus der DE 198 16 315 AI 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.For example, from DE 198 16 315 AI a fuel injection valve is known in particular for the direct injection of fuel into the combustion chamber of an internal combustion engine. '' The fuel injection valve comprises an armature, which cooperates with a solenoid coil, and a valve needle which is positively connected to the armature and on which a Valve closing body is provided, which forms a sealing seat together with a valve seat surface. The valve needle has a first stop for the armature movable on it, the armature being additionally acted upon by a second return spring. A stationary second stop for the armature is also provided. The second return spring acts on the armature counter to the stroke direction and holds the armature against the second stop in the non-energized state of the solenoid so that the armature is spaced from the first stop formed on the valve needle by a predetermined distance. A disadvantage of the fuel injector known from DE 198 16 315 AI is, in particular, that although a pre-stroke principle is implemented which enables an improvement in the valve dynamics when the fuel injector is opened, armature bumps occur when the fuel injector closes when the armature returns to the starting position, which means that further undesired opening strokes of the valve needle are induced.
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 injector according to the invention with the characterizing features of the main claim has the advantage that the armature is mounted swinging on the valve needle by a correspondingly arranged spring and therefore a preliminary stroke can take place during the opening process, but the armature can swing through when closing relative to the valve needle, which means that 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 subclaims allow advantageous developments of the fuel injector specified in the main claim.
Weiterhin ist von Vorteil, daß die Feder in einfacher Weise als Schraubenfeder ausgebildet und auf die Ventilnadel aufgesteckt ist.Another advantage is that the spring is designed in a simple manner as a helical spring and is 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 .The spring is advantageously arranged between a flange which is non-positively connected to the valve needle 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. Weiterhin ist vorteilhaft, daß ein gehäusefester Anschlagring vorgesehen ist, der als unterer Ankeranschlag dient .It is also advantageous that the sleeve can be produced in a simple manner and mounted on the armature in the fuel injection valve. It is also advantageous that a stop ring fixed to the housing is provided which serves as the lower anchor stop.
Zeichnungdrawing
Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung vereinfacht dargestellt und in der nachfolgendenAn embodiment of the invention is shown in simplified form in the drawing and in the following
Beschreibung näher erläutert. Es zeigen:Description explained in more detail. Show it:
Fig. 1 einen schematischen Schnitt durch ein Ausführungsbeispiel eines erfindungsgemäß ausgestalteten Brennstoffeinspritzventils undFig. 1 shows a schematic section through an embodiment of a fuel injector designed according to the invention and
Fig. 2 einen vergrößerten Ausschnitt aus dem in Fig. 1 dargestellten Ausführungsbeispiel eines erfindungsgemäßen Brennstoffeinspritzventils im Bereich II in Fig. 1.FIG. 2 shows an enlarged detail from the exemplary embodiment of a fuel injector according to the invention shown in FIG. 1 in 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.An exemplary embodiment of the invention is described below by way of example. Matching components are provided with matching reference numerals in all figures.
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 exemplary embodiment of a fuel injection valve 1 according to the invention shown in FIG. 1 is in the form of a fuel injection valve 1 for fuel injection systems of mixture-compressing, spark-ignited internal combustion engines. The fuel injection valve 1 is particularly suitable for injecting fuel directly 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 operatively connected to a valve closing body 4, which is connected to a valve seat body 5 arranged valve seat surface 6 cooperates to form a sealing seat. In the exemplary embodiment, the fuel injection valve 1 is a fuel injection valve 1 that opens inwards and has a spray opening 7. The nozzle body 2 is sealed by a seal 8 against an outer pole 9 of a solenoid 10. The magnet coil 10 is encapsulated in a coil housing 11 and wound on a coil carrier 12 which bears against an inner pole 13 of the magnet coil 10. The inner pole 13 and the outer pole 9 are separated from one another by a constriction 26 and connected to one another by a non-ferromagnetic connecting component 29. The magnet coil 10 is excited via a line 19 by an electrical current that can be supplied via an electrical plug contact 17. The plug contact 17 is surrounded by a plastic sheath 18, which can be molded onto 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 sϊch 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.An armature 20 is movably arranged on the valve needle 3. This is spaced from a first flange 21, which is non-positively connected to the valve needle 3 by means of a weld seam 22, by a preliminary stroke gap 27. A return spring 23 is supported on the first flange 21, which in the present design of the fuel injection valve 1 is preloaded by a sleeve 24. A working air gap 33 is formed between a lower stop surface of the inner pole 13 and the armature 20.
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. 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.Fuel channels 30 and 32 run in the armature 20 and on a guide element 36. The fuel is supplied via a central fuel supply 16 and filtered by a filter element 25. The fuel injector 1 is sealed by a seal 28 against a fuel rail, not shown, and by a further seal 37, against a cylinder head, not shown. A second flange 34 is arranged on the spray-side side of the armature 20, which is also non-positively connected to the valve needle 3 via a weld seam 35.
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 cup-shaped sleeve 14 is provided on the outflow side 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 stop ring 38 fixed to the housing serves as an anchor stop on the downstream side. The measures according to the invention are explained in more detail below with reference to FIG. 2.
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 in such a way that the valve closing body 4 is held in sealing contact with the valve seat surface 6. When the magnet coil 10 is excited, it builds up a magnetic field, which initially moves the armature 20 in the stroke direction against the spring force of the spring 31, the preliminary stroke or the armature free travel being achieved by a preliminary stroke gap 27 located in the rest position between the first flange 21 and the armature 20 is specified. After passing through the forward stroke, the armature 20 is pulled against the force of the return spring 23 to the inner pole 13 of the magnet coil 10, the armature 20 taking along the first flange 21, which is welded to the valve needle 3, whereby this is also carried in the stroke direction. The valve closing body 4, which is connected to the valve needle 3, lifts off the valve seat surface 6, and the fuel guided via the fuel channels 30 and 32 is sprayed off through the spray 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 switched off, the armature 20 drops from the inner pole 13 after the magnetic field has been sufficiently reduced by the pressure of the return spring 23, as a result of which the first flange 21, which is connected to the valve needle 3, moves counter to the stroke direction. The valve needle 3 will thereby moved in the same direction, whereby the valve closing body 4 rests on the valve seat surface 6 and the fuel injector 1 is closed. The sleeve 14 is at the same time 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 can be seen from FIG. 2, is arranged between the second flange 34 and a bottom part 40 of the sleeve 14, the armature 20 is arranged on the valve needle 3 in a freely swinging manner. So-called first order anchor bumpers are avoided by preventing the armature 20 from striking the flange 34 during the closing direction of the fuel injector 1 during the closing movement. Instead, it is intercepted by the stop ring 38. The armature 20 is therefore braked by the spring 31 during the closing movement. At the same time, the pre-stroke principle, which enables the opening dynamics of fuel injector 1 to be improved, is 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 connected to the armature 20 via a collar 39 fixed, '- for example by welding, soldering' -or gluing. The stop ring 38 is fixed to the housing, for example by being pressed in or welded 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 anwendbar. The invention is not limited to the exemplary embodiment shown and can also be used for other forms of fuel injection valves 1.

Claims

Ansprüche Expectations
1. Brennstoffeinspritzventil (1), insbesondere zum direkten Einspritzen von Brennstoff in den Brennraum einer gemischverdichtenden, fremdgezündeten Brennkraftmaschine, mit einem Anker (20) , der mit einer Magnetspule (10) zusammenwirkt, und einer mit dem Anker (20) kraftschlüssig verbundenen Ventilnadel (3) , an der ein Ventilschließkörper (4) vorgesehen ist, der zusammen mit einer Ventilsitzfläche (6) einen Dichtsitz bildet, '"• dadurch gekennzeichnet:, daß der Anker (20) durch eine Feder (31) schwingend auf der5 Ventilnadel (3) gelagert ist.1.Fuel injection valve (1), in particular for injecting fuel directly into the combustion chamber of a mixture-compressing, spark-ignition internal combustion engine, with an armature (20) which interacts with a solenoid coil (10) and a valve needle (8) which is non-positively connected to the armature (20) to which a valve closing body (4) is provided 3) which forms a sealing seat together with a valve seat face (6), ' "• characterized :, that the armature (20) by a spring (31) swinging on der5 valve needle (3 ) is stored.
2. Brennstoffeinspritzventil nach Anspruch 1, dadurch gekennzeichnet, daß abströmseitig des Ankers (20) eine Hülse (14) angeordnet ist.2. Fuel injection valve according to claim 1, characterized in that a sleeve (14) is arranged on the downstream side of the armature (20).
3. Brennstoffeinspritzventil nach Anspruch 2, dadurch gekennzeichnet, daß die Hülse (14) topfförmig mit einem Kragen (39)5 ausgebildet ist.3. Fuel injection valve according to claim 2, characterized in that the sleeve (14) is pot-shaped with a collar (39) 5.
4. Brennstoffeinspritzventil nach Anspruch 3, dadurch gekennzeichnet, daß die Hülse (14) mit dem Anker (20) über den Kragen (39) verschweißt ist.4. Fuel injection valve according to claim 3, characterized in that that the sleeve (14) is welded to the armature (20) over the collar (39).
5. Brennstoffeinspritzventil nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die Hülse (14) von der Ventilnadel (3) in einem Bodenteil (40) durchgriffen ist.5. Fuel injection valve according to one of claims 1 to 4, characterized in that the sleeve (14) is penetrated by the valve needle (3) in a bottom part (40).
6. Brennstoffeinspritzventil nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß ein mit der Ventilnadel (3) in kraftschlüssiger Verbindung stehender Flansch (34) innerhalb der Hülse (14) angeordnet ist.6. Fuel injection valve according to one of claims 1 to 5, characterized in that a with the valve needle (3) in non-positive connection flange (34) is arranged within the sleeve (14).
7. Brennstoffeinspritzventil nach Anspruch 6, dadurch gekennzeichnet, daß die Feder (31) zwischen dem Flansch (34) und der Hülse (14) angeordnet ist.7. Fuel injection valve according to claim 6, characterized in that the spring (31) between the flange (34) and the sleeve (14) is arranged.
8. Brennstoffeinspritzventil nach Anspruch 7, dadurch gekennzeichnet, daß die Feder (31) von der Ventilnadel (3) durchgriffen ist.8. Fuel injection valve according to claim 7, characterized in that the spring (31) is penetrated by the valve needle (3).
9. Brennstoffeinspritzventil nach Anspruch 7 oder 8, dadurch gekennzeichnet, daß die Feder (31) als Schraubenfeder (31) ausgeführt ist.9. Fuel injection valve according to claim 7 or 8, characterized in that the spring (31) is designed as a helical spring (31).
10. Brennstoffeinspritzventil nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, daß in dem Brennstoffeinspritzventil (1) abströmseitig der Hülse (14) ein Anschlagring (38) angeordnet ist.10. Fuel injection valve according to one of claims 1 to 9, characterized in that a stop ring (38) is arranged in the fuel injection valve (1) downstream of the sleeve (14).
11. Brennstoffeinspritzventil nach Anspruch 10, dadurch gekennzeichnet, daß der Anschlagring (38) gehäusefest ist. 11. Fuel injection valve according to claim 10, characterized in that the stop ring (38) is fixed to the housing.
12. Brennstoffeinspritzventil nach Anspruch 10 oder 11, dadurch gekennzeichnet, daß die Hülse (14) im unbestromten Zustand der Magnetspule (10) an dem Anschlagring (38) anliegt.12. Fuel injection valve according to claim 10 or 11, characterized in that the sleeve (14) abuts the stop ring (38) in the de-energized state of the magnet coil (10).
13. Brennstoffeinspritzventil nach einem der Ansprüche 1 bis 12, dadurch gekennzeichnet, daß zwischen dem Anker (20) und einem Innenpol (13) der Magnetspule (10) ein Arbeitsluftspalt (33) ausgebildet ist.13. Fuel injection valve according to one of claims 1 to 12, characterized in that a working air gap (33) is formed between the armature (20) and an inner pole (13) of the magnet coil (10).
14. Brennstoffeinspritzventil nach einem der Ansprüche 3 bis 13, dadurch gekennzeichnet, daß der Flansch (34) und der Anker (20) durch einen Abstand in der Dicke des Kragens (39) der Hülse (14) beabstandet sind. 14. Fuel injection valve according to one of claims 3 to 13, characterized in that the flange (34) and the armature (20) are spaced apart by a distance in the thickness of the collar (39) of the sleeve (14).
EP05716755A 2004-05-18 2005-02-21 Fuel injection valve Active 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)

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

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

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US20080277505A1 (en) 2008-11-13
US8528842B2 (en) 2013-09-10
WO2005113973A1 (en) 2005-12-01
JP4243610B2 (en) 2009-03-25
EP1751420B1 (en) 2009-10-28
DE102004024533A1 (en) 2005-12-15
DE502005008412D1 (en) 2009-12-10
JP2008506875A (en) 2008-03-06

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