EP1797313B1 - Fuel injection valve - Google Patents

Fuel injection valve Download PDF

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Publication number
EP1797313B1
EP1797313B1 EP05797089A EP05797089A EP1797313B1 EP 1797313 B1 EP1797313 B1 EP 1797313B1 EP 05797089 A EP05797089 A EP 05797089A EP 05797089 A EP05797089 A EP 05797089A EP 1797313 B1 EP1797313 B1 EP 1797313B1
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EP
European Patent Office
Prior art keywords
fuel injection
injection valve
valve according
solenoid
valve
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EP05797089A
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German (de)
French (fr)
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EP1797313A1 (en
Inventor
Ferdinand Reiter
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP1797313A1 publication Critical patent/EP1797313A1/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
    • F02M51/0614—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of electromagnets or fixed armature
    • 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
    • F02M51/0682—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 the body being hollow and its interior communicating with the fuel flow
    • 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
    • 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
    • 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
    • F02M61/166—Selection of particular materials

Definitions

  • the invention relates to a fuel injection valve according to the preamble of the main claim.
  • a fuel injection valve which comprises a core surrounded by a magnetic coil, an armature, by means of which a valve seat with a fixed valve seat cooperable by means of a welded to the anchor connecting tube, a tubular intermediate metal part, with its one end facing the armature end the core and at its other end to a tubular connecting part by welding is tightly connected, and at least one of the magnetic coil spanning bow-shaped guide member which is connected with its valve closing body end facing the connecting part and at its other end to the core by welding.
  • the welding of two overlapping components of the fuel injection valve takes place in a cross-sectional reduction of one of the two parts to be welded.
  • the fuel injection valve according to the invention with the characterizing features of the main claim has the advantage that between the housing and the valve sleeve, a reliable seal by a fuel-resistant elastomer is axially possible.
  • This seal is a preferably made of rubber disc, which has the advantage that the sealing element used is simple and inexpensive.
  • Another advantage is that the rubber disc within the valve has only a small footprint, which is further reduced by the fact that the rubber disc is compressed after assembly.
  • the height and the shape of the increase is designed so that the coil is always pressed onto the rubber disc, if the lid is mounted on its final position.
  • This reliable seal has the advantage that it is independent of the tolerance of the items, which are compensated by targeted deformation of the increase tolerances and the coil is set backlash under axial bias.
  • an inner radius of the disc is smaller than a radius of a valve sleeve. Furthermore, it is advantageous that the inner radius of the disc is dimensioned so that the sealing of the valve sleeve takes place.
  • the fuel injection valve 1 comprises a magnetic coil 2 which is wound on a bobbin 3.
  • the bobbin 3 is encapsulated in a pot-shaped valve housing 4.
  • valve needle 8 is in operative connection with a ball-shaped in the exemplary embodiment valve closing body 10 which forms a sealing seat with a valve seat body 11. Downstream of the sealing seat, at least one injection orifice 13 is formed, from which the fuel is injected into the suction pipe, not shown.
  • the armature 7 is in the idle state of the fuel injection valve 1 by a return spring 14 with a force is applied so that the fuel injection valve 1 is kept closed by the pressure of the valve closing body 10 on the valve seat body 11.
  • the return spring 14 is disposed in a recess 15 of the armature 7 and the inner pole 6 and is brought by an adjusting sleeve 16 to bias.
  • a cup-shaped filter element 17 is preferably pressed into the valve sleeve 5.
  • the fuel which is supplied via a central fuel supply 18, flows through the fuel injection valve 1 through a supply pipe 24, the recess 15 and flows to the valve seat body 11 and the injection orifice 13.
  • the fuel injection valve 1 is provided in the region of the central fuel supply 18 with a seal 19. Another seal 20 seals the connection, not shown, between the fuel injection valve 1 and the intake manifold.
  • the suction tube is not shown here, since it does not matter for the core of the invention.
  • the solenoid coil 2 is energized via a line from an electrical current which can be supplied via an electrical plug contact 21.
  • the plug-in contact 21 is surrounded by a plug connection extrusion 22, which may be injection-molded onto the valve sleeve 5 or on the supply pipe 24.
  • the fuel injection valve 1 is closed as soon as the magnetic coil 2 exciting current is turned off and the magnetic field is reduced so far that the return spring 14, the armature 7 deprives the inner pole 6, whereby the valve needle 8 moves in the outflow direction and the valve closing body 10 touches on the valve seat body 11 ,
  • the valve sleeve 5 is designed tubular. Between valve housing 4 and valve sleeve 5 according to the invention a disc 25 made of an elastomeric material, preferably a rubber washer 25, is provided which constitutes a reliable seal of the valve sleeve 5, wherein an inner radius of the disc 25 is smaller than a radius of the valve sleeve 5. Here is the inner radius the disc 25 dimensioned so that the valve sleeve 5 is sealed.
  • the rubber disc 25 can be installed fixed either as a loose component or eg by gluing on the bobbin 3.
  • a coil carrier 3 which has at its downstream end a radially encircling collar 12 which is circumferentially disposed on the lower end side of the bobbin 3, radially outside of the rubber disc 25 and at a clamped state of the rubber disc 25 at the shoulder of the valve housing. 4 is applied.
  • a plurality of knobs may also be mounted radially symmetrically on the lower end of the coil carrier 3.
  • the elevation 27 may be in the form of a partial ring 27A, the dimensions of its cross section 27B being small in relation to the radial extent of the end surface 30 facing the cover 28.
  • both the height and the cross section 27B of the increase 27 is designed so that the magnetic coil 2 is pressed regardless of the tolerance of the individual parts on the rubber disk 25, whereby the tolerances are compensated by targeted deformation of the increase 27.
  • Over the circumference of the bobbin 3 and a plurality of elevations 27 may be arranged.
  • the solenoid 2 is set free of play under axial bias, it being ensured that the hydraulic pressure which is caused by the plastic mass in the Steckanschlußumspritzung 22, causes no additional axial movement of the solenoid 2.

Abstract

The invention relates to a fuel injection valve (1) comprising a solenoid (2), which interacts with an armature (7) acted upon by a return spring (14), this armature, together with a valve needle (8), forming an axially displaceable valve part. A valve closing body (10) is provided on the valve needle (8) and, together with a valve seat body (11), forms a sealing seat. In addition, a reliable sealing of the valve sleeve (5) is provided that is comprised of a rubber washer (25) placed underneath the solenoid (2), and this sealing is further improved by virtue of the fact that the solenoid (2) subjected to axial pretensioning is pressed against the rubber washer (25).

Description

Stand der TechnikState of the art

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

Beispielsweise ist aus der DE 40 03 227 A1 ein Brennstoffeinspritzventil bekannt, das einen von einer Magnetspule umgebenen Kern, einen Anker, durch den ein mit einem festen Ventilsitz zusammenwirkender Ventilschließkörper mittels eines mit dem Anker verschweißten Verbindungsrohres betätigbar ist, ein rohrförmiges metallenes Zwischenteil, das mit seinem einen Ende mit einem dem Anker zugewandten Ende des Kerns und mit seinem anderen Ende mit einem rohrförmigen Verbindungsteil durch Schweißen dicht verbunden ist, und zumindest ein die Magnetspule übergreifendes bügelförmiges Leitelement umfaßt, das mit seinem dem Ventilschließkörper zugewandten Ende mit dem Verbindungsteil und mit seinem anderen Ende mit dem Kern durch Schweißen verbunden ist. Dabei erfolgt die Verschweißung jeweils zweier sich überlappender Bauteile des Brennstoffeinspritzventils in einer Querschnittsverringerung eines der beiden zu verschweißenden Teile.For example, is from the DE 40 03 227 A1 a fuel injection valve is known which comprises a core surrounded by a magnetic coil, an armature, by means of which a valve seat with a fixed valve seat cooperable by means of a welded to the anchor connecting tube, a tubular intermediate metal part, with its one end facing the armature end the core and at its other end to a tubular connecting part by welding is tightly connected, and at least one of the magnetic coil spanning bow-shaped guide member which is connected with its valve closing body end facing the connecting part and at its other end to the core by welding. In this case, the welding of two overlapping components of the fuel injection valve takes place in a cross-sectional reduction of one of the two parts to be welded.

Nachteilig bei dem aus der obengenannten Druckschrift bekannten Brennstoffeinspritzventil ist insbesondere, daß die Herstellung der Verbindungen zwischen den einzelnen Komponenten des Brennstoffeinspritzventils kompliziert und damit zeit- und kostenintensiv ist. Weiterhin werden die verschweißten Stellen thermisch belastet und büßen dadurch in ihrer Festigkeit und Biegesteifigkeit ein, was zu erheblichen Resonanzen durch unterschiedlich starke Gehäuseteile und damit verbundene Geräuschentwicklung beim Betrieb des Brennstoffeinspritzventils führen kann. Des weiteren bewirkt ein unterhalb der saugrohrseitigen Dichtung angespritzter Stützring, daß Kontaktstellen zwischen Gehäuse und Ventilhülse nicht zuverlässig abgedichtet sind, was insbesondere beim Turbobetrieb des Motors zu Problemen wegen schlechter Abdichtung führen kann.A disadvantage of the fuel injection valve known from the above publication is in particular that the preparation of the connections between the individual components of the fuel injection valve is complicated and thus time-consuming and costly. Furthermore, the welded areas are thermally stressed and thereby lose their strength and flexural rigidity, resulting in considerable resonances can result from differently strong housing parts and associated noise during operation of the fuel injection valve. Furthermore causes a molded below the suction pipe side seal support ring that contact points between the housing and the valve sleeve are not reliably sealed, which can lead to problems due to poor sealing especially in turbo operation of the engine.

Aus der GB 2 034 403 A ist bereits ein Brennstoffeinspritzventil mit einer Magnetspule, die mit einem von einer Rückstellfeder beaufschlagten Anker zusammenwirkt, der zusammen mit einer Ventilnadel ein axial bewegliches Ventilteil bildet, wobei an der Ventilnadel ein Ventilschließkörper vorgesehen ist, der mit einem Ventilsitzkörper einen Dichtsitz bildet, bekannt Zur Abdichtung der Magnetspule gegenüber dem Ventilgehäuse sind zwei O-Ringe aus einem Elastomerwerkstoff oberhalb und unterhalb der Magnetspule in durch den Spulenkörper gebildeten Ringräumen eingebracht Wie der Begriff "O-Ring" es bereits verdeutlicht, handelt es sich dabei um klassische Dichtringe, die weitgehend einen kreisförmigen Querschnitt besitzen.From the GB 2 034 403 A is already a fuel injection valve with a solenoid which cooperates with an acted upon by a return spring armature which forms an axially movable valve member together with a valve needle, wherein on the valve needle, a valve closing body is provided which forms a sealing seat with a valve seat body, known for sealing the Magnet coil with respect to the valve housing are two O-rings made of an elastomer material above and below the magnetic coil formed in the annulus formed by the bobbin As the term "O-ring" already illustrates it, these are classic sealing rings, which have a substantially circular cross-section ,

Aus den Druckschriften US 5,244,180 A , US 4,711,400 A und US 4,427,156 A . sind bereits Brennstoffeinspritzventile bekannt, bei denen Dichtringe im Bereich der Magnetspulen, vorgesehen sind, die flacher ausgeführt sind und im verpressten Zustand zumindest eine flache Ringform ergeben.From the pamphlets US 5,244,180 A . US 4,711,400 A and US 4,427,156 A , Fuel injection valves are already known in which sealing rings are provided in the region of the magnetic coils, which are made flatter and at least give a flat ring shape in the compressed state.

Vorteile der ErfindungAdvantages of the invention

Das erfindungsgemäße Brennstoffeinspritzventil mit den kennzeichnenden Merkmalen des Hauptanspruchs hat demgegenüber den Vorteil, daß zwischen dem Gehäuse und der Ventilhülse eine zuverlässige Abdichtung durch ein kraftstoffbeständiges Elastomer axial möglich ist. Diese Abdichtung ist eine vorzugsweise aus Gummi gefertigte Scheibe, was den Vorteil hat, daß das verwendete Dichtelement einfach und kostengünstig ist. Ein weiterer Vorteil besteht darin, daß die Gummischeibe innerhalb des Ventils nur einen geringen Platzbedarf aufweist, der zusätzlich dadurch noch verringert wird, daß die Gummischeibe nach der Montage zusammengepreßt wird.The fuel injection valve according to the invention with the characterizing features of the main claim has the advantage that between the housing and the valve sleeve, a reliable seal by a fuel-resistant elastomer is axially possible. This seal is a preferably made of rubber disc, which has the advantage that the sealing element used is simple and inexpensive. Another advantage is that the rubber disc within the valve has only a small footprint, which is further reduced by the fact that the rubber disc is compressed after assembly.

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

Vorteilhafterweise kann bei der Montage des Brennstoffeinspritzventils die Axialkraft über eine Erhöhung, die auf der Stirnfläche des Spulenträgers angebracht ist, vom Deckel über die Magnetspule auf die Gummischeibe übertragen werden, so daß die Gummischeibe gut gegen Magnetspule und den Flansch des Ventilgehäuses gepreßt wird, was die Abdichtung noch verbessert.Advantageously, in the assembly of the fuel injection valve, the axial force via an increase, which is mounted on the end face of the bobbin, are transmitted from the lid via the magnetic coil on the rubber disc, so that the rubber disc is pressed well against the magnet coil and the flange of the valve housing, which Sealing still improved.

Dabei ist die Höhe und die Form der Erhöhung so ausgelegt, daß die Spule immer auf die Gummischeibe gepreßt wird, wenn der Deckel auf seine Endposition montiert wird. Diese zuverlässige Abdichtung hat den Vorteil, daß sie unabhängig von der Toleranz der Einzelteile ist, wobei durch gezielte Verformung der Erhöhung die Toleranzen ausgeglichen sind und die Spule spielfrei unter axiale Vorspannung gesetzt ist.The height and the shape of the increase is designed so that the coil is always pressed onto the rubber disc, if the lid is mounted on its final position. This reliable seal has the advantage that it is independent of the tolerance of the items, which are compensated by targeted deformation of the increase tolerances and the coil is set backlash under axial bias.

Des weiteren sorgt die axiale Vorspannung durch die auf der dem Deckel zugewandten Stirnfläche angebrachte Erhöhung dafür, daß der hydraulische Druck der plastischen Masse bei der Steckanschlußumspritzung keine zusätzliche Axialbewegung der Spule verursacht, die die Lötung von Spule und Stecker-Clip schädigen könnte.Furthermore, the axial bias provided by the mounted on the end face facing the cover ensures that the hydraulic pressure of the plastic mass in the Steckanschlußumspritzung causes no additional axial movement of the coil, which could damage the soldering coil and connector clip.

Es ist vorteilhaft, daß ein Innenradius der Scheibe kleiner ist als ein Radius einer Ventilhülse. Ferner ist es vorteilhaft, daß der Innenradius der Scheibe so bemessen ist, daß die Abdichtung der Ventilhülse erfolgt.It is advantageous that an inner radius of the disc is smaller than a radius of a valve sleeve. Furthermore, it is advantageous that the inner radius of the disc is dimensioned so that the sealing of the valve sleeve takes place.

Zeichnungdrawing

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

Fig. 1
einen schematischen Schnitt durch ein Ausführungsbeispiel eines erfindungsgemäß ausgestalteten Brennstoffeinspritzventils;
Fig. 2
einen schematischen Teilschnitt durch das erfindungsgemäß ausgestaltete Brennstoffeinspritzventil entsprechend einem ersten Ausführungsbeispiel;
Fig. 3
einen schematischen Teilschnitt durch das erfindungsgemäß ausgestaltete Brennstoffeinspritzventil entsprechend einem zweiten Ausführungsbeispiel; und
Fig. 4
einen schematischen Teilschnitt durch das erfindungsgemäß ausgestaltete Brennstoffeinspritzventil entsprechend einem dritten Ausführungsbeispiel.
Embodiments of the invention are shown in simplified form in the drawing and explained in more detail in the following description. Show it:
Fig. 1
a schematic section through an embodiment of an inventively designed fuel injection valve;
Fig. 2
a schematic partial section through the inventively embodied fuel injection valve according to a first embodiment;
Fig. 3
a schematic partial section through the inventively embodied fuel injection valve according to a second embodiment; and
Fig. 4
a schematic partial section through the inventively embodied fuel injection valve according to a third embodiment.

Beschreibung der AusführungsbeispieleDescription of the embodiments

Nachfolgend wird ein erstes Ausführungsbeispiel der Erfindung anhand von Fig. 1 beispielhaft beschrieben.Hereinafter, a first embodiment of the invention with reference to Fig. 1 described by way of example.

Fig. 1 zeigt in einer schematisierten Schnittdarstellung einen Längsschnitt durch ein Ausführungsbeispiel eines erfindungsgemäß ausgestalteten Brennstoffeinspritzventils 1, welches insbesondere zum Einspritzen von Brennstoff in ein nicht näher dargestelltes Saugrohr einer Brennkraftmaschine geeignet ist. Fig. 1 shows a schematic sectional view of a longitudinal section through an embodiment of an inventively designed fuel injector 1, which is particularly suitable for injecting fuel into a not shown suction manifold of an internal combustion engine.

Das Brennstoffeinspritzventil 1 umfaßt eine Magnetspule 2, die auf einen Spulenträger 3 gewickelt ist. Der Spulenträger 3 ist in einem topfförmigen Ventilgehäuse 4 gekapselt.The fuel injection valve 1 comprises a magnetic coil 2 which is wound on a bobbin 3. The bobbin 3 is encapsulated in a pot-shaped valve housing 4.

Der Spulenträger 3 wird von einer Ventilhülse 5 durchgriffen, die rohrförmig ausgestaltet ist. Abströmseitig des Innenpols 6 ist ein Anker 7 angeordnet, der mit einer Ventilnadel 8 verbunden ist.The bobbin 3 is penetrated by a valve sleeve 5, which is designed tubular. Downstream of the inner pole 6, an armature 7 is arranged, which is connected to a valve needle 8.

Die erfindungsgemäßen Maßnahmen werden weiter unten näher beschrieben.The measures according to the invention will be described in more detail below.

Die Ventilnadel 8 steht in Wirkverbindung mit einem im Ausführungsbeispiel kugelförmigen Ventilschließkörper 10, der mit einem Ventilsitzkörper 11 einen Dichtsitz bildet. Stromabwärts des Dichtsitzes ist wenigstens eine Abspritzöffnung 13 ausgebildet, aus der der Brennstoff in das nicht weiter dargestellte Saugrohr eingespritzt wird.The valve needle 8 is in operative connection with a ball-shaped in the exemplary embodiment valve closing body 10 which forms a sealing seat with a valve seat body 11. Downstream of the sealing seat, at least one injection orifice 13 is formed, from which the fuel is injected into the suction pipe, not shown.

Der Anker 7 ist im Ruhezustand des Brennstoffeinspritzventils 1 von einer Rückstellfeder 14 mit einer Kraft so beaufschlagt, daß das Brennstoffeinspritzventil 1 durch den Andruck des Ventilschließkörpers 10 auf den Ventilsitzkörper 11 geschlossen gehalten wird. Die Rückstellfeder 14 ist in einer Ausnehmung 15 des Ankers 7 bzw. des Innenpols 6 angeordnet und wird durch eine Einstellhülse 16 auf Vorspannung gebracht. Zulaufseitig der Einstellhülse 16 ist ein topfförmiges Filterelement 17 in die Ventilhülse 5 vorzugsweise eingepreßt. Der Brennstoff, der über eine zentrale Brennstoffzufuhr 18 zugeleitet wird, durchströmt das Brennstoffeinspritzventil 1 durch ein Zuleitungsrohr 24, die Ausnehmung 15 und strömt zum Ventilsitzkörper 11 und zur Abspritzöffnung 13.The armature 7 is in the idle state of the fuel injection valve 1 by a return spring 14 with a force is applied so that the fuel injection valve 1 is kept closed by the pressure of the valve closing body 10 on the valve seat body 11. The return spring 14 is disposed in a recess 15 of the armature 7 and the inner pole 6 and is brought by an adjusting sleeve 16 to bias. On the inlet side of the adjusting sleeve 16, a cup-shaped filter element 17 is preferably pressed into the valve sleeve 5. The fuel, which is supplied via a central fuel supply 18, flows through the fuel injection valve 1 through a supply pipe 24, the recess 15 and flows to the valve seat body 11 and the injection orifice 13.

Zur Montage an einer nicht weiter dargestellten Brennstoffverteilerleitung ist das Brennstoffeinspritzventil 1 im Bereich der zentralen Brennstoffzufuhr 18 mit einer Dichtung 19 versehen. Eine weitere Dichtung 20 dichtet die nicht weiter dargestellte Verbindung zwischen dem Brennstoffeinspritzventil 1 und dem Saugrohr ab. Das Saugrohr ist hier nicht weiter dargestellt, da es für den Kern der Erfindung keine Rolle spielt. Die Magnetspule 2 wird über eine Leitung von einem über einen elektrischen Steckkontakt 21 zuführbaren elektrischen Strom erregt. Der Steckkontakt 21 ist von einer Steckanschlußumspritzung 22 umgeben, die an der Ventilhülse 5 bzw. am Zuleitungsrohr 24 angespritzt sein kann.For mounting on a fuel distributor line, not shown, the fuel injection valve 1 is provided in the region of the central fuel supply 18 with a seal 19. Another seal 20 seals the connection, not shown, between the fuel injection valve 1 and the intake manifold. The suction tube is not shown here, since it does not matter for the core of the invention. The solenoid coil 2 is energized via a line from an electrical current which can be supplied via an electrical plug contact 21. The plug-in contact 21 is surrounded by a plug connection extrusion 22, which may be injection-molded onto the valve sleeve 5 or on the supply pipe 24.

Wird der Magnetspule 2 über eine nicht weiter dargestellte elektrische Leitung ein elektrischer Strom zugeführt, baut sich ein magnetisches Feld auf, das bei ausreichender Stärke den Anker 7 entgegen der Kraft der Rückstellfeder 14 und entgegen der Strömungsrichtung des Brennstoffs in die Magnetspule 2 hineinzieht. Dadurch wird ein zwischen dem Anker 7 und dem Stützrohr 6 ausgebildeter Arbeitsspalt 23 geschlossen. Durch die Bewegung des Ankers 7 wird auch die mit dem Anker 7 verbundene Ventilnadel 8 in Hubrichtung mitgenommen, so daß der Ventilschließkörper 10 vom Ventilsitzkörper 11 abhebt und Brennstoff über die Abspritzöffnung 13 abgespritzt wird.If the solenoid coil 2 is supplied via an electrical line, not shown, an electric current, a magnetic field builds up, which pulls the armature 7 counter to the force of the return spring 14 and counter to the flow direction of the fuel in the magnetic coil 2 with sufficient strength. As a result, a working gap 23 formed between the armature 7 and the support tube 6 is closed. By the movement of the armature 7 and the valve 7 connected to the armature needle 8 is taken in the stroke direction, so that the valve closing body 10 from Valve seat body 11 lifts and fuel is sprayed through the spray opening 13.

Das Brennstoffeinspritzventil 1 wird geschlossen, sobald der die Magnetspule 2 erregende Strom abgeschaltet und das Magnetfeld soweit abgebaut ist, daß die Rückstellfeder 14 den Anker 7 vom Innenpol 6 abdrückt, wodurch sich die Ventilnadel 8 in Abströmrichtung bewegt und der Ventilschließkörper 10 auf dem Ventilsitzkörper 11 aufsetzt.The fuel injection valve 1 is closed as soon as the magnetic coil 2 exciting current is turned off and the magnetic field is reduced so far that the return spring 14, the armature 7 deprives the inner pole 6, whereby the valve needle 8 moves in the outflow direction and the valve closing body 10 touches on the valve seat body 11 ,

Die Ventilhülse 5 ist rohrförmig ausgestaltet. Zwischen Ventilgehäuse 4 und Ventilhülse 5 ist erfindungsgemäß eine Scheibe 25 aus einem Elastomerwerkstoff, vorzugsweise eine Gummischeibe 25, vorgesehen, die eine zuverlässige Abdichtung der Ventilhülse 5 darstellt, wobei ein Innenradius der Scheibe 25 kleiner ist als ein Radius der Ventilhülse 5. Dabei ist der Innenradius der Scheibe 25 so bemessen, daß die Ventilhülse 5 abgedichtet ist. Dies ist in den Zeichnungen Fig.1 bis Fig.4 gezeigt. Des weiteren weist der Spulenträger 3 auf einer einem Deckel 28 des Spulenraumes zugewandten Stirnfläche 30, vorzugsweise an seinem Innendurchmesser, zumindest eine Erhöhung 27 auf, die in Fig.3 gezeigt ist. Dabei wird bei der Montage Axialkraft vom Deckel 28 über die dem Deckel 28 zugewandte Stirnseite 30 und über die Magnetspule 2/Spulenträger 3 auf die Gummischeibe 25 übertragen. Die Gummischeibe 25 kann entweder als loses Bauteil oder z.B. durch Kleben am Spulenträger 3 fixiert eingebaut sein.The valve sleeve 5 is designed tubular. Between valve housing 4 and valve sleeve 5 according to the invention a disc 25 made of an elastomeric material, preferably a rubber washer 25, is provided which constitutes a reliable seal of the valve sleeve 5, wherein an inner radius of the disc 25 is smaller than a radius of the valve sleeve 5. Here is the inner radius the disc 25 dimensioned so that the valve sleeve 5 is sealed. This is in the drawings Fig.1 to Fig.4 shown. Furthermore, the bobbin 3 on a lid 28 of the bobbin space facing end face 30, preferably at its inner diameter, at least one elevation 27, which in Figure 3 is shown. During assembly, axial force is transmitted from the cover 28 via the end face 30 facing the cover 28 and via the magnet coil 2 / coil support 3 to the rubber disk 25. The rubber disc 25 can be installed fixed either as a loose component or eg by gluing on the bobbin 3.

In Fig.4 ist ein Spulenträger 3 dargestellt, der an seinem abwärtigen Ende einen radial umlaufenden Kragen 12 aufweist, der umfänglich an der unteren Stirnseite des Spulenträgers 3, radial außerhalb der Gummischeibe 25 angeordnet ist und der bei einem eingespannten Zustand der Gummischeibe 25 an der Schulter des Ventilgehäuses 4 anliegt. Alternativ zu einem umlaufenden Kragen können auch mehrere Noppen radialsymmetrisch an dem unteren Ende des Spulenträgers 3 angebracht sein.In Figure 4 a coil carrier 3 is shown, which has at its downstream end a radially encircling collar 12 which is circumferentially disposed on the lower end side of the bobbin 3, radially outside of the rubber disc 25 and at a clamped state of the rubber disc 25 at the shoulder of the valve housing. 4 is applied. As an alternative to a circumferential collar, a plurality of knobs may also be mounted radially symmetrically on the lower end of the coil carrier 3.

Die Erhöhung 27 kann in Form eines Teilringes 27A vorliegen, wobei die Abmessungen seines Querschnitts 27B klein gegenüber der radialen Ausdehnung der dem Deckel 28 zugewandten Stirnfläche 30 sind. Dabei ist sowohl die Höhe als auch der Querschnitt 27B der Erhöhung 27 so ausgelegt, daß die Magnetspule 2 unabhängig von der Toleranz der Einzelteile auf die Gummischeibe 25 gepreßt ist, wobei durch gezielte Verformung der Erhöhung 27 die Toleranzen ausgeglichen sind. Über den Umfang des Spulenträgers 3 können auch mehrere Erhöhungen 27 angeordnet sein.The elevation 27 may be in the form of a partial ring 27A, the dimensions of its cross section 27B being small in relation to the radial extent of the end surface 30 facing the cover 28. In this case, both the height and the cross section 27B of the increase 27 is designed so that the magnetic coil 2 is pressed regardless of the tolerance of the individual parts on the rubber disk 25, whereby the tolerances are compensated by targeted deformation of the increase 27. Over the circumference of the bobbin 3 and a plurality of elevations 27 may be arranged.

Die Magnetspule 2 ist dabei spielfrei unter axiale Vorspannung gesetzt, wobei dafür gesorgt ist, daß der hydraulische Druck, der bei der Steckanschlußumspritzung 22 von der plastischen Masse verursacht wird, keine zusätzliche Axialbewegung der Magnetspule 2 bewirkt.The solenoid 2 is set free of play under axial bias, it being ensured that the hydraulic pressure which is caused by the plastic mass in the Steckanschlußumspritzung 22, causes no additional axial movement of the solenoid 2.

Die Erfindung ist nicht auf die dargestellten Ausführungsbeispiele beschränkt. Insbesondere sind beliebige Kombinationen der verschiedenen Merkmale möglich.The invention is not limited to the illustrated embodiments. In particular, any combinations of the various features are possible.

Claims (15)

  1. Fuel injection valve (1) having a solenoid (2) which interacts with an armature (7) on which a restoring spring (14) acts and which forms, together with a valve needle (8), an axially movable valve part, wherein a valve-closing body (10), which forms a sealing seat with a valve seat body (11), is provided on the valve needle (8),
    characterized
    in that a disc (25) made of an elastomer material is mounted between the solenoid (2) and a valve housing (4), wherein an inner radius of the disc (25) is smaller than a radius of a valve sleeve (5) which engages through the solenoid (2) on the inside, and the inner radius of the disc (25) is dimensioned in such a way that the valve sleeve (5) is sealed, wherein in the installed state the disc (25) bears on the circumference of the valve sleeve (5).
  2. Fuel injection valve according to Claim 1,
    characterized
    in that the disc (25) is secured between the solenoid (2) and the valve housing (4) in the axial direction by a clamping effect.
  3. Fuel injection valve according to one of Claims 1 to 2,
    characterized
    in that the disc (25) is attached to a coil carrier (3) of the solenoid (2).
  4. Fuel injection valve according to Claim 3,
    characterized
    in that the disc (25) is bonded onto a coil carrier (3) of the solenoid (2).
  5. Fuel injection valve according to one of Claims 1 to 4,
    characterized
    in that the disc (25) is composed of a fuel-resistant elastomer, in particular of rubber.
  6. Fuel injection valve according to one of Claims 1 to 5,
    characterized
    in that a coil carrier (3) has at least one elevated portion (27) on an end face (30) facing a cover (28).
  7. Fuel injection valve according to Claim 6,
    characterized
    in that the elevated portion (27) is in the shape of at least one partial ring (27A) on the end face (30), facing the cover (28), of the coil carrier (3).
  8. Fuel injection valve according to Claim 7,
    characterized
    in that the end face (30), facing the cover (28), of the coil carrier (3) has at least two partial rings (27A) as an elevated portion (27).
  9. Fuel injection valve according to Claim 8,
    characterized
    in that each of the partial rings (27A) which are located on the end face (30), facing the cover (28), of the coil carrier (3) is part of a circle.
  10. Fuel injection valve according to one of Claims 6 to 9,
    characterized
    in that the cross section (27B) of the at least one elevated portion (27) is triangular or trapezoidal.
  11. Fuel injection valve according to one of Claims 6 to 9,
    characterized
    in that the cross section (27B) of the at least one elevated portion (27) is part of a circle.
  12. Fuel injection valve according to Claim 9,
    characterized
    in that a height of the cross section (27B) of the at least one elevated portion (27) is smaller than a radial extent of the end face (30) facing the cover (28).
  13. Fuel injection valve according to one of Claims 1 to 12,
    characterized
    in that the solenoid (2) is secured between the coil carrier (3) and the valve housing (4) with axial prestress.
  14. Fuel injection valve according to Claim 13,
    characterized
    in that the solenoid (2) is secured without play between the coil carrier (3) and the valve housing (4).
  15. Fuel injection valve according to one of Claims 1 to 5,
    characterized
    in that a coil carrier (3) has, on an end face facing away from a cover (28), a collar or a plurality of knobs (12) which surround the circumference of the disc (25).
EP05797089A 2004-09-29 2005-09-07 Fuel injection valve Active EP1797313B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004047179A DE102004047179A1 (en) 2004-09-29 2004-09-29 Fuel injector
PCT/EP2005/054408 WO2006034945A1 (en) 2004-09-29 2005-09-07 Fuel injection valve

Publications (2)

Publication Number Publication Date
EP1797313A1 EP1797313A1 (en) 2007-06-20
EP1797313B1 true EP1797313B1 (en) 2012-04-04

Family

ID=35485013

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05797089A Active EP1797313B1 (en) 2004-09-29 2005-09-07 Fuel injection valve

Country Status (5)

Country Link
US (1) US20080035762A1 (en)
EP (1) EP1797313B1 (en)
JP (1) JP4542155B2 (en)
DE (1) DE102004047179A1 (en)
WO (1) WO2006034945A1 (en)

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CN103925135A (en) * 2014-04-12 2014-07-16 哈尔滨工程大学 Common rail oil injector
CN103925136A (en) * 2014-04-12 2014-07-16 哈尔滨工程大学 Fuel injector with solenoid valve mounted on side

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EP2896816A1 (en) * 2014-01-16 2015-07-22 Continental Automotive GmbH Filter assembly for a fuel injector, fuel injector and method for assembly the filter assembly
CN105840379A (en) * 2016-03-24 2016-08-10 中国北方发动机研究所(天津) L-shaped common-rail fuel injector
WO2018003559A1 (en) * 2016-07-01 2018-01-04 日立オートモティブシステムズ株式会社 Fuel injection valve
CN107152363A (en) * 2017-07-03 2017-09-12 浙江凯利智控科技有限公司 Fuel injector magnetic structure

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CN103925136A (en) * 2014-04-12 2014-07-16 哈尔滨工程大学 Fuel injector with solenoid valve mounted on side
CN103925136B (en) * 2014-04-12 2016-08-17 哈尔滨工程大学 The fuel injector that a kind of electromagnetic valve is mounted laterally
CN103925135B (en) * 2014-04-12 2017-02-01 哈尔滨工程大学 Common rail oil injector

Also Published As

Publication number Publication date
JP2008514858A (en) 2008-05-08
US20080035762A1 (en) 2008-02-14
WO2006034945A1 (en) 2006-04-06
EP1797313A1 (en) 2007-06-20
DE102004047179A1 (en) 2006-03-30
JP4542155B2 (en) 2010-09-08

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