EP1377747B1 - Fuel injection valve with a filter bush - Google Patents

Fuel injection valve with a filter bush Download PDF

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Publication number
EP1377747B1
EP1377747B1 EP02721980A EP02721980A EP1377747B1 EP 1377747 B1 EP1377747 B1 EP 1377747B1 EP 02721980 A EP02721980 A EP 02721980A EP 02721980 A EP02721980 A EP 02721980A EP 1377747 B1 EP1377747 B1 EP 1377747B1
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EP
European Patent Office
Prior art keywords
fuel injection
filter
injection valve
sleeve
fuel
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
EP02721980A
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German (de)
French (fr)
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EP1377747A1 (en
Inventor
Dieter Maier
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Robert Bosch GmbH
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Robert Bosch GmbH
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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
    • F02M61/165—Filtering elements specially adapted in fuel inlets to injector
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
    • F02M51/0625—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
    • F02M51/0664—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding
    • F02M51/0671—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding the armature having an elongated valve body attached thereto
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/50—Arrangements of springs for valves used in fuel injectors or fuel injection pumps
    • F02M2200/505—Adjusting spring tension by sliding spring seats

Definitions

  • the invention is based on a fuel injection valve according to the preamble of the main claim.
  • a filter for a Fuel injection valve with central fuel supply known, which in positive connection with a Adjustment sleeve for a return spring, which is the Keeps fuel injector closed at rest, stands.
  • the filter consists of a plastic frame, over which a grid is placed.
  • the filter is by means of a latching closure with the preferably off Metal existing adjusting sleeve connected. This allows the static flow through the fuel injector as well be calibrated after inserting the filter.
  • a disadvantage of the above-mentioned publications known fuel injection valves is in particular the high production costs, which fix the filter either on the adjusting sleeve or on the Fuel inlet is obtained.
  • filters and Adjusting sleeve made of different materials, where on the contact surfaces mainly on the plastic of the filter Abrasion and abrasion occur, causing malfunction of the Fuel injection valve by the deposition of the particles can lead.
  • a fuel injection valve is already known, the one having electromagnetic circuit and a valve needle with a valve closing body has, which cooperates with a valve seat surface to a sealing seat, wherein the Valve needle is acted upon in the closing direction by a return spring.
  • the Return spring is adjusted with a bias by a setting sleeve.
  • the Adjusting sleeve can be provided with an integrated fuel filter. This is one Mesh or net-like fabric attached to the adjustment. After the production the adjusting sleeve, the filter fabric in a further step in be suitably fastened to the adjusting sleeve. In use of the Fuel injection valve there is a risk that the filter fabric back from the Can release the adjusting sleeve.
  • the fuel injection valve according to the invention with the characterizing features of the main claim has In contrast, the advantage that the sleeve for adjusting the dynamic flow integral with the filter element is formed and thus on the one hand, the position of the sleeve is easily adjustable by the outstanding filter element and on the other hand a fast and inexpensive Production and assembly is possible.
  • the combined filter sleeve is doing by deep drawing manufactured inexpensively, so that on a plastic frame dispensed with an attached filter grid can.
  • flow openings are provided which through Laser drilling in large numbers quickly and accurately in the Filter sleeve can be introduced.
  • the filter sleeve if the Need exists, can also be removed again.
  • a fuel injection valve 1 is z. B. in the form of a Injector for fuel injection systems of spark-ignited, mixture-compressing internal combustion engines executed.
  • the illustrated fuel injection valve 1 suitable for direct injection of fuel into one not shown combustion chamber of an internal combustion engine.
  • the Invention is also in fuel injection valves. 1 for injecting fuel into a suction pipe of Internal combustion engine in the same way suitable.
  • the fuel injection valve 1 consists of a Nozzle body 2, in which a valve needle 3 is guided.
  • the valve needle 3 is connected to a valve closing body 4 in Operative connection, with a on a valve seat body. 5 arranged valve seat surface 6 to a sealing seat interacts.
  • the fuel injection valve 1 acts it is in the exemplary embodiment to an inwardly opening Fuel injection valve 1, which via a Spray opening 7 has.
  • the nozzle body 2 is through a Seal 8 against an outer pole 9 of a magnetic coil 10th sealed.
  • the magnetic coil 10 is in a coil housing 11 encapsulated and wound on a bobbin 12, which rests against an inner pole 13 of the magnetic coil 10. Of the Inner pole 13 and the outer pole 9 are through a gap 26th separated and based on one 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.
  • Stroke adjustment is a paired shim 15.
  • An the other side of the dial 15 is a Anchor 20. This is frictionally connected via a flange 21 with the valve needle 3 in conjunction, by a Weld 22 is connected to the flange 21.
  • a return spring 23 is supported, which in the present design of the Fuel injection valve 1 by a sleeve 24 Bias is brought.
  • the as adjusting sleeve trained sleeve 24 is inventively integral with a filter element 25 is formed.
  • the thus formed component is referred to below as a filter sleeve 34.
  • the Filter effect arises through flow openings 35, which in an inflow end 36 of the filter sleeve 34th are introduced.
  • a downstream end 37 of the Filter sleeve 34 is formed so that it is for adjusting the Spring bias of the return spring 23 and thus to Setting the static flow rate through the Fuel injector 1 can be used.
  • a Detailed description of the filter sleeve 34 is the Description to Fig. 2 can be seen.
  • the armature 20 and the Valve seat body 5 extend fuel channels 30a to 30c, the fuel, which has a central Fuel supply 16 is supplied to the injection opening. 7 conduct.
  • the fuel injection valve 1 is through a Seal 28 against a not shown Receiving bore, z. B. in a fuel rail, sealed.
  • the armature 20 drops sufficient reduction of the magnetic field by the pressure of the Return spring 23 from the inner pole 13, causing the with the valve needle 3 operatively connected flange 21st moved against the stroke direction.
  • the valve needle 3 is thereby moved in the same direction, causing the Valve closing body 4 touches on the valve seat surface 6 and the fuel injection valve 1 is closed.
  • Fig. 2 shows in an excerpted sectional view of the in Fig. 1 with II designated detail of the invention designed fuel injection valve. 1
  • the filter sleeve 34 is so constructed that at the inlet end 36, the Through openings 35 are formed, while the downstream end 37 is sleeve-shaped, so that the bias of the return spring 23 by the insertion the filter sleeve 34 in the fuel injection valve. 1 is changeable.
  • the filter sleeve 34 is preferably made of metal Molded to a permanent clamping effect during the entire life of the fuel injection valve 1 to guarantee.
  • the production is done by deep drawing, a Manufacturing process that is simple and inexpensive.
  • the diameter the flow-through openings 35 is preferably 0.04 to 0.05 mm, whereby dirt particles in the fuel in can be filtered satisfactorily.
  • the number the flow openings 35 depends on the available area of the filter area 25. For example can by an extension of the filter sleeve 34 or through Utilization of the surface of an inlet-side cover plate 38 of the Filter sleeve 34 increases the number of flow openings 35 become.
  • the interior of the fuel injection valve 1 can on this Same way twice against contaminants that too Malfunction during operation of the fuel injection valve 1 can be protected.
  • the Adjustment of the dynamic flow by shifting the filter sleeve 34 with already mounted filter 25, so that Dirt of the setting tool not in the Valve interior can get.
  • omitted Abspanungen and abrasion when pressing the filter 25 am End of the production line which also malfunctions by deposition of the abrasion or larger particles be avoided.
  • the adjustment of the dynamic flow through the Fuel injector 1 can be combined by the Filter sleeve 34 made easier and faster.
  • the filter sleeve 34 protrudes due to its greater overall length so far upstream in the central fuel supply 16, that they are easier to move or, in case of emergency, even again can be removed.
  • the invention is not limited to those shown Embodiments limited and for any construction of fuel injection valves 1 suitable, for.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • 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.

Bei bereits bekannten Brennstoffeinspritzventilen sind Brennstoffilter in einen Brennstoffeinlaßstutzen eingepreßt und damit darin befestigt. Diese Befestigungsart bringt die Gefahr der Bildung von Abrieb und Spänen mit sich, die zu funktionalen Störungen des Brennstoffeinspritzventils führen können. Außerdem werden Haltekragen für obere Dichtringe als Einzelbauteile ausgeführt.In already known fuel injection valves are Fuel filter pressed into a fuel inlet port and attached to it. This attachment brings the Danger of formation of abrasion and chips with it, which too cause functional disturbances of the fuel injection valve can. In addition, retaining collar for upper sealing rings as Individual components executed.

Aus der DE 43 25 842 A1 ist bereits ein Brennstoffeinspritzventil bekannt, bei dem ein Brennstoffilter einteilig mit einem Haltekragen ausgeführt ist. Der Haltekragen erstreckt sich radial über den Brennstoffeinlaßstutzen hinaus und besitzt außerhalb des Brennstoffeinlaßstutzens eine Nase. Die umlaufende Nase des Haltekragens bildet zusammen mit einer Nut am äußeren Umfang des Brennstoffeinlaßstutzens eine Rastverbindung, durch die der Brennstoffilter definiert befestigt ist. Zwischen dem Grundkörper des Brennstoffilters und der inneren Wandung des Brennstoffeinlaßstutzens liegt nur eine Spielpassung vor, so daß jegliche Spanbildung im , Inneren des Brennstoffeinspritzventils vermieden wird.From DE 43 25 842 A1 is already a Fuel injection valve known in which a Fuel filter made in one piece with a retaining collar is. The retaining collar extends radially over the Fuel inlet and out of the outside Fuel intake nozzle a nose. The surrounding nose of the Retaining collar forms together with a groove on the outer circumference the Brennstoffeinlaßstutzens a latching connection through which the fuel filter is defined defined. Between the Main body of the fuel filter and the inner wall of the Brennstoffeinlaßstutzens is only a clearance fit, so that any chip formation in, inside of Fuel injector is avoided.

Weiterhin ist aus der EP 0 697 064 B1 ein Filter für ein Brennstoffeinspritzventil mit zentraler Brennstoffzufuhr bekannt, welches in formschlüssiger Verbindung mit einer Einstellhülse für eine Rückstellfeder, die das Brennstoffeinspritzventil im Ruhezustand geschlossen hält, steht. Der Filter besteht dabei aus einem Kunststoffgestell, über welches ein Gittergeflecht gelegt ist. Der Filter ist mit Hilfe eines Rast-Verschlusses mit der vorzugsweise aus Metall bestehenden Einstellhülse verbunden. Dadurch kann der statische Durchfluß durch das Brennstoffeinspritzventil auch nach Einsetzen des Filters kalibriert werden.Furthermore, from EP 0 697 064 B1 a filter for a Fuel injection valve with central fuel supply known, which in positive connection with a Adjustment sleeve for a return spring, which is the Keeps fuel injector closed at rest, stands. The filter consists of a plastic frame, over which a grid is placed. The filter is by means of a latching closure with the preferably off Metal existing adjusting sleeve connected. This allows the static flow through the fuel injector as well be calibrated after inserting the filter.

Nachteilig an den aus den oben genannten Druckschriften bekannten Brennstoffeinspritzventilen ist insbesondere der hoher Fertigungsaufwand, der zur Fixierung des Filters entweder an der Einstellhülse oder an dem Brennstoffeinlaßstutzen anfällt. Ferner bestehen Filter und Einstellhülse aus unterschiedlichen Materialien, wobei an den Kontaktflächen vorwiegend am Kunststoff des Filters Abspanungen und Abrieb auftreten, was zu Fehlfunktionen des Brennstoffeinspritzventils durch die Ablagerung der Partikel führen kann.A disadvantage of the above-mentioned publications known fuel injection valves is in particular the high production costs, which fix the filter either on the adjusting sleeve or on the Fuel inlet is obtained. There are also filters and Adjusting sleeve made of different materials, where on the contact surfaces mainly on the plastic of the filter Abrasion and abrasion occur, causing malfunction of the Fuel injection valve by the deposition of the particles can lead.

Aus der US 5,921,475 A ist bereits ein Brennstoffeinspritzventil bekannt, das einen elektromagnetischen Kreis aufweist und eine Ventilnadel mit einem Ventilschließkörper besitzt, der mit einer Ventilsitzfläche zu einem Dichtsitz zusammenwirkt, wobei die Ventilnadel in Schließrichtung von einer Rückstellfeder beaufschlagt ist. Die Rückstellfeder wird mit einer Vorspannung durch eine Einstellhülse eingestellt. Die Einstellhülse kann mit einem integrierten Brennstofffilter versehen sein. Dazu ist ein maschen- bzw. netzartiges Gewebe an der Einstellhülse angebracht. Nach der Herstellung der Einstellhülse muss das Filtergewebe in einem weiteren Verfahrensschritt in geeigneter Weise an der Einstellhülse befestigt werden. Im Gebrauch des Brennstoffeinspritzventils besteht die Gefahr, dass sich das Filtergewebe wieder von der Einstellhülse lösen kann.From US 5,921,475 A, a fuel injection valve is already known, the one having electromagnetic circuit and a valve needle with a valve closing body has, which cooperates with a valve seat surface to a sealing seat, wherein the Valve needle is acted upon in the closing direction by a return spring. The Return spring is adjusted with a bias by a setting sleeve. The Adjusting sleeve can be provided with an integrated fuel filter. This is one Mesh or net-like fabric attached to the adjustment. After the production the adjusting sleeve, the filter fabric in a further step in be suitably fastened to the adjusting sleeve. In use of the Fuel injection valve there is a risk that the filter fabric back from the Can release the adjusting sleeve.

Vorteile der ErfindungAdvantages of the invention

Das erfindungsgemäße Brennstoffeinspritzventil mit den kennzeichnenden Merkmalen des Hauptanspruchs hat demgegenüber den Vorteil, daß die Hülse zur Einstellung des dynamischen Durchflusses einstückig mit dem Filterelement ausgebildet ist und somit einerseits die Position der Hülse durch das herausragende Filterelement leicht einstellbar ist und andererseits eine schnelle und kostengünstige Herstellung und Montage ermöglicht wird.The fuel injection valve according to the invention with the characterizing features of the main claim has In contrast, the advantage that the sleeve for adjusting the dynamic flow integral with the filter element is formed and thus on the one hand, the position of the sleeve is easily adjustable by the outstanding filter element and on the other hand a fast and inexpensive Production and assembly is possible.

Die kombinierte Filterhülse wird dabei durch Tiefziehen kostengünstig hergestellt, so daß auf ein Kunststoffgestell mit einem daran angebrachten Filtergitter verzichtet werden kann.The combined filter sleeve is doing by deep drawing manufactured inexpensively, so that on a plastic frame dispensed with an attached filter grid can.

Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterentwicklungen und Verbesserungen des im Hauptanspruch angegebenen Brennstoffeinspritzventils möglich.By the measures listed in the dependent claims are advantageous developments and improvements of the im Main claim specified fuel injector possible.

Vorzugsweise sind Durchströmöffnungen vorgesehen, die durch Laserbohren in großer Anzahl schnell und exakt in die Filterhülse einbringbar sind.Preferably, flow openings are provided which through Laser drilling in large numbers quickly and accurately in the Filter sleeve can be introduced.

Von Vorteil ist insbesondere auch, daß die Einstellung des Durchflusses bei bereits eingesetztem Filter erfolgen kann, da Verschmutzungen des Ventilinnenraums durch die Einstellwerkzeuge vermieden werden können.Of particular advantage is that the setting of Flow can take place with already inserted filter, because contamination of the valve interior by the Adjustment tools can be avoided.

Weiterhin ist von Vorteil, daß die Filterhülse, falls die Notwendigkeit besteht, auch wieder entfernt werden kann.Furthermore, it is advantageous that the filter sleeve, if the Need exists, can also be removed again.

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 auszugsweisen schematischen Schnitt durch das in Fig. 1 dargestellte Ausführungsbeispiel 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
a partial schematic section through the embodiment shown in Fig. 1 in the region II in Fig. 1st

Beschreibung des AusführungsbeispielsDescription of the embodiment

Ein Brennstoffeinspritzventil 1 ist z. B. in der Form eines Einspritzventils für Brennstoffeinspritzanlagen von fremdgezündeten, gemischverdichtenden Brennkraftmaschinen ausgeführt. Das dargestellte Brennstoffeinspritzventil 1 eignet sich zum direkten Einspritzen von Brennstoff in einen nicht dargestellten Brennraum einer Brennkraftmaschine. Die Erfindung ist aber auch bei Brennstoffeinspritzventilen 1 zum Einspritzen von Brennstoff in ein Saugrohr der Brennkraftmaschine in gleicher Weise geeignet.A fuel injection valve 1 is z. B. in the form of a Injector for fuel injection systems of spark-ignited, mixture-compressing internal combustion engines executed. The illustrated fuel injection valve 1 suitable for direct injection of fuel into one not shown combustion chamber of an internal combustion engine. The Invention is also in fuel injection valves. 1 for injecting fuel into a suction pipe of Internal combustion engine in the same way suitable.

Das Brennstoffeinspritzventil 1 besteht aus einem Düsenkörper 2, in welchem eine Ventilnadel 3 geführt 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 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 fuel injection valve 1 consists of a Nozzle body 2, in which a valve needle 3 is guided. The valve needle 3 is connected to a valve closing body 4 in Operative connection, with a on a valve seat body. 5 arranged valve seat surface 6 to a sealing seat interacts. When the fuel injection valve 1 acts it is in the exemplary embodiment to an inwardly opening Fuel injection valve 1, which via a Spray opening 7 has. The nozzle body 2 is through a Seal 8 against an outer pole 9 of a magnetic coil 10th sealed. The magnetic coil 10 is in a coil housing 11 encapsulated and wound on a bobbin 12, which rests against an inner pole 13 of the magnetic coil 10. Of the Inner pole 13 and the outer pole 9 are through a gap 26th separated and based on one 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 Flansch 21 kraftschlüssig mit der Ventilnadel 3 in Verbindung, die durch eine Schweißnaht 22 mit dem Flansch 21 verbunden ist.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 frictionally connected via a flange 21 with the valve needle 3 in conjunction, by a Weld 22 is connected to the flange 21.

Auf dem Flansch 21 stützt sich eine Rückstellfeder 23 ab, welche in der vorliegenden Bauform des Brennstoffeinspritzventils 1 durch eine Hülse 24 auf Vorspannung gebracht wird. Die als Einstellhülse ausgebildete Hülse 24 ist erfindungsgemäß einstückig mit einem Filterelement 25 ausgebildet. Das so gebildete Bauteil wird im folgenden als Filterhülse 34 bezeichnet. Die Filterwirkung entsteht dabei durch Durchströmöffnungen 35, welche in einem zuströmseitigen Ende 36 der Filterhülse 34 eingebracht sind. Ein abströmseitiges Ende 37 der Filterhülse 34 ist so ausgeformt, daß es zur Einstellung der Federvorspannung der Rückstellfeder 23 und damit zur Einstellung der statischen Durchflußmenge durch das Brennstoffeinspritzventil 1 herangezogen werden kann. Eine detaillierte Beschreibung der Filterhülse 34 ist der Beschreibung zu Fig. 2 zu entnehmen.On the flange 21, a return spring 23 is supported, which in the present design of the Fuel injection valve 1 by a sleeve 24 Bias is brought. The as adjusting sleeve trained sleeve 24 is inventively integral with a filter element 25 is formed. The thus formed component is referred to below as a filter sleeve 34. The Filter effect arises through flow openings 35, which in an inflow end 36 of the filter sleeve 34th are introduced. A downstream end 37 of the Filter sleeve 34 is formed so that it is for adjusting the Spring bias of the return spring 23 and thus to Setting the static flow rate through the Fuel injector 1 can be used. A Detailed description of the filter sleeve 34 is the Description to Fig. 2 can be seen.

In der Ventilnadelführung 14, im Anker 20 und am Ventilsitzkörper 5 verlaufen Brennstoffkanäle 30a bis 30c, die den Brennstoff, welcher über eine zentrale Brennstoffzufuhr 16 zugeführt wird, zur Abspritzöffnung 7 leiten. Das Brennstoffeinspritzventil 1 ist durch eine Dichtung 28 gegen eine nicht weiter dargestellte Aufnahmebohrung, z. B. in einem Fuel Rail, abgedichtet.In the valve needle guide 14, the armature 20 and the Valve seat body 5 extend fuel channels 30a to 30c, the fuel, which has a central Fuel supply 16 is supplied to the injection opening. 7 conduct. The fuel injection valve 1 is through a Seal 28 against a not shown Receiving bore, z. B. in a fuel rail, sealed.

Im Ruhezustand des Brennstoffeinspritzventils 1 wird der Anker 20 von der Rückstellfeder 23 entgegen seiner Hubrichtung so beaufschlagt, daß der Ventilschließkörper 4 am Ventilsitz 6 in dichtender Anlage gehalten wird. Bei Erregung der Magnetspule 10 baut diese ein Magnetfeld auf, welches den Anker 20 entgegen der Federkraft der Rückstellfeder 23 in Hubrichtung bewegt, wobei der Hub durch einen in der Ruhestellung zwischen dem Innenpol 13 und dem Anker 20 befindlichen Arbeitsspalt 27 vorgegeben ist. Der Anker 20 nimmt den Flansch 21, welcher mit der Ventilnadel 3 verschweißt ist, ebenfalls in Hubrichtung mit. Der mit der Ventilnadel 3 in Wirkverbindung stehende Ventilschließkörper 4 hebt von der Ventilsitzfläche ab und Brennstoff wird über die Abspritzöffnung 7 abgespritzt.In the idle state of the fuel injection valve 1 is the Anchor 20 of the return spring 23 against its Lifting direction acted upon so that the valve closing body. 4 is held in sealing engagement with the valve seat 6. 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, wherein the stroke through one in the rest position between the inner pole 13 and the Anchor 20 working gap 27 is given. Of the Anchor 20 takes the flange 21, which with the valve needle 3rd is welded, also in the stroke direction with. The one with the Valve needle 3 in operative connection valve closing body 4 lifts off the valve seat surface and fuel overflows the spray opening 7 hosed down.

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 Wirkverbindung stehende 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.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 from the inner pole 13, causing the with the valve needle 3 operatively connected flange 21st moved against the stroke direction. The valve needle 3 is thereby moved in the same direction, causing the Valve closing body 4 touches on the valve seat surface 6 and the fuel injection valve 1 is closed.

Fig. 2 zeigt in einer auszugsweisen Schnittdarstellung das in Fig. 1 mit II bezeichnete Detail des erfindungsgemäß ausgestalteten Brennstoffeinspritzventils 1.Fig. 2 shows in an excerpted sectional view of the in Fig. 1 with II designated detail of the invention designed fuel injection valve. 1

Wie bereits weiter oben erwähnt, ist die Filterhülse 34 so aufgebaut, daß am zulaufseitigen Ende 36 die Durchströmöffnungen 35 ausgebildet sind, während das abströmseitige Ende 37 hülsenförmig ausgebildet ist, so daß die Vorspannung der Rückstellfeder 23 durch das Einschieben der Filterhülse 34 in das Brennstoffeinspritzventil 1 veränderbar ist.As already mentioned above, the filter sleeve 34 is so constructed that at the inlet end 36, the Through openings 35 are formed, while the downstream end 37 is sleeve-shaped, so that the bias of the return spring 23 by the insertion the filter sleeve 34 in the fuel injection valve. 1 is changeable.

Die Filterhülse 34 ist dabei vorzugsweise aus Metall ausgeformt, um eine dauerhafte Klemmwirkung während der gesamten Lebensdauer des Brennstoffeinspritzventils 1 zu gewährleisten. Die Herstellung erfolgt durch Tiefziehen, ein Herstellungsverfahren, das einfach und kostengünstig ist.The filter sleeve 34 is preferably made of metal Molded to a permanent clamping effect during the entire life of the fuel injection valve 1 to guarantee. The production is done by deep drawing, a Manufacturing process that is simple and inexpensive.

Zur Vermeidung größeren Herstellungsaufwands für den Filterbereich 25 der Filterhülse 34 werden kleinkalibrige Durchströmöffnungen 35 in großer Anzahl in das zulaufseitige Ende 36 der Filterhülse 34 eingebracht. Dies geschieht vorzugsweise durch Laserbohren, da hierbei äußerst feine, kleinvolumige Bohrungen herstellbar sind. Der Durchmesser der Durchströmöffnungen 35 beträgt vorzugsweise 0,04 bis 0,05 mm, wodurch Schmutzpartikel im Brennstoff in befriedigendem Maße ausgefiltert werden können. Die Anzahl der Durchströmöffnungen 35 richtet sich dabei nach der verfügbaren Fläche des Filterbereiches 25. Beispielsweise kann durch eine Verlängerung der Filterhülse 34 oder durch Ausnutzung der Fläche einer zulaufseitigen Deckplatte 38 der Filterhülse 34 die Anzahl der Durchströmöffnungen 35 erhöht werden.To avoid larger manufacturing costs for the Filter portion 25 of the filter sleeve 34 are small caliber Throughflow openings 35 in large numbers in the inlet side End 36 of the filter sleeve 34 introduced. this happens preferably by laser drilling, since this is extremely fine, small-volume holes can be produced. The diameter the flow-through openings 35 is preferably 0.04 to 0.05 mm, whereby dirt particles in the fuel in can be filtered satisfactorily. The number the flow openings 35 depends on the available area of the filter area 25. For example can by an extension of the filter sleeve 34 or through Utilization of the surface of an inlet-side cover plate 38 of the Filter sleeve 34 increases the number of flow openings 35 become.

Das Innere des Brennstoffeinspritzventils 1 kann auf diese Weise gleich zweifach gegen Verunreinigungen, die zu Fehlfunktionen beim Betrieb des Brennstoffeinspritzventils 1 führen können, geschützt werden. Einerseits erfolgt die Einstellung des dynamischen Durchflusses durch Verschieben der Filterhülse 34 bei bereits montiertem Filter 25, so daß Verschmutzungen des Einstellwerkzeugs nicht in den Ventilinnenraum gelangen können. Andererseits entfallen Abspanungen und Abrieb beim Einpressen des Filters 25 am Ende der Produktionslinie, wodurch ebenfalls Fehlfunktionen durch Ablagerung des Abriebs oder größerer Partikel vermieden werden.The interior of the fuel injection valve 1 can on this Same way twice against contaminants that too Malfunction during operation of the fuel injection valve 1 can be protected. On the one hand, the Adjustment of the dynamic flow by shifting the filter sleeve 34 with already mounted filter 25, so that Dirt of the setting tool not in the Valve interior can get. On the other hand omitted Abspanungen and abrasion when pressing the filter 25 am End of the production line, which also malfunctions by deposition of the abrasion or larger particles be avoided.

Auch die Einstellung des dynamischen Durchflusses durch das Brennstoffeinspritzventil 1 kann durch die kombinierte Filterhülse 34 einfacher und schneller erfolgen. Zum einen ragt die Filterhülse 34 bedingt durch ihre größere Baulänge so weit stromaufwärtig in die zentrale Brennstoffzufuhr 16, daß sie einfacher verschoben oder im Notfall sogar wieder entfernt werden kann. Zum anderen ist die Filterhülse 34 nach Einstellung des Durchflusses erheblich näher an der Ventilgruppe angeordnet, so daß auch die Oberfläche zwischen der Filterhülse 34 und der Ventilgruppe kleiner wird und somit die Verschmutzungsgefahr abnimmt.Also the adjustment of the dynamic flow through the Fuel injector 1 can be combined by the Filter sleeve 34 made easier and faster. On the one hand the filter sleeve 34 protrudes due to its greater overall length so far upstream in the central fuel supply 16, that they are easier to move or, in case of emergency, even again can be removed. On the other hand, the filter sleeve 34th after setting the flow considerably closer to the Valve group arranged so that the surface between the filter sleeve 34 and the valve group is smaller and thus the risk of contamination decreases.

Die Erfindung ist nicht auf die dargestellten Ausführungsbeispiele beschränkt und für beliebige Bauweisen von Brennstoffeinspritzventilen 1 geeignet, z. B. für Brennstoffeinspritzventile 1 für Saugrohreinspritzung oder für Brennstoffeinspritzventile 1 mit Anbindung an ein Common-Rail-System.The invention is not limited to those shown Embodiments limited and for any construction of fuel injection valves 1 suitable, for. For example Fuel injection valves 1 for port injection or for fuel injectors 1 with connection to a Common rail system.

Claims (5)

  1. Fuel injection valve (1) for fuel injection systems of internal combustion engines, with a magnet coil (10), with a valve needle (3) operatively connected to the magnet coil (10) and acted upon in a closing direction by a return spring (23), for the actuation of a valve-closing body (4) which, together with a valve-seat surface (6), forms a sealing seat, and with a sleeve (24) which acts with prestress upon the return spring (23), characterized in that the sleeve (24) is produced in one piece with a filter element (25) to form a one-part deep-drawn filter sleeve (34) which has throughflow orifices (25) for filtering the fuel flowing through the fuel injection valve (1).
  2. Fuel injection valve according to Claim 1, characterized in that the throughflow orifices (35) are introduced in an inflow-side end (36) of the filter sleeve (34).
  3. Fuel injection valve according to Claim 1 or 2, characterized in that the throughflow orifices (35) are introduced into the filter sleeve (34) by means of laser drilling.
  4. Fuel injection valve according to one of Claims 1 to 3, characterized in that the diameters of the throughflow orifices (35) are 0.04 mm to 0.05 mm.
  5. Fuel injection valve according to one of Claims 1 to 4, characterized in that an outflow-side end (37) of the filter sleeve (34) is designed in such a way that the return spring (23) can be acted upon with a variable prestress by means of the displacement of the filter sleeve (34).
EP02721980A 2001-02-28 2002-02-27 Fuel injection valve with a filter bush Expired - Lifetime EP1377747B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10109410A DE10109410A1 (en) 2001-02-28 2001-02-28 Fuel injector
DE10109410 2001-02-28
PCT/DE2002/000691 WO2002068816A1 (en) 2001-02-28 2002-02-27 Fuel injection valve with a filter bush

Publications (2)

Publication Number Publication Date
EP1377747A1 EP1377747A1 (en) 2004-01-07
EP1377747B1 true EP1377747B1 (en) 2005-04-20

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Application Number Title Priority Date Filing Date
EP02721980A Expired - Lifetime EP1377747B1 (en) 2001-02-28 2002-02-27 Fuel injection valve with a filter bush

Country Status (7)

Country Link
US (1) US7070127B2 (en)
EP (1) EP1377747B1 (en)
JP (1) JP2004518864A (en)
CN (1) CN1455847A (en)
CZ (1) CZ20022963A3 (en)
DE (2) DE10109410A1 (en)
WO (1) WO2002068816A1 (en)

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Publication number Publication date
CN1455847A (en) 2003-11-12
CZ20022963A3 (en) 2004-05-12
JP2004518864A (en) 2004-06-24
US20030155445A1 (en) 2003-08-21
DE10109410A1 (en) 2002-09-05
EP1377747A1 (en) 2004-01-07
US7070127B2 (en) 2006-07-04
WO2002068816A1 (en) 2002-09-06
DE50202846D1 (en) 2005-05-25

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