EP1913252B1 - Fuel injection valve - Google Patents

Fuel injection valve Download PDF

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Publication number
EP1913252B1
EP1913252B1 EP06777975.1A EP06777975A EP1913252B1 EP 1913252 B1 EP1913252 B1 EP 1913252B1 EP 06777975 A EP06777975 A EP 06777975A EP 1913252 B1 EP1913252 B1 EP 1913252B1
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EP
European Patent Office
Prior art keywords
sealing body
fuel injection
valve
injection valve
valve according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP06777975.1A
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German (de)
French (fr)
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EP1913252A1 (en
Inventor
Ferdinand Reiter
Christof Vogel
Chris Louis
Gerald Scheday
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP1913252A1 publication Critical patent/EP1913252A1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
    • F02M51/0625—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
    • F02M51/0664—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding
    • F02M51/0671—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
    • 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
    • F02M2200/16—Sealing of fuel injection apparatus not otherwise provided for
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/90—Selection of particular materials
    • F02M2200/9015—Elastomeric or plastic 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 connection pipe, 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 facing the end with 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.
  • a disadvantage of the fuel injection valve known from the above document is in particular that the preparation of the connections between the individual components of the fuel injection valve complicated and thus time consuming and costly is. Furthermore, the welded areas are thermally stressed and thereby lose their strength and flexural rigidity, which can lead to significant resonances due to differently strong housing parts and associated noise during operation of the fuel injection valve. Furthermore, causes a molded-in 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 in particular during turbo operation of the internal combustion engine.
  • a fuel injection valve which has a magnetic coil which cooperates with an acted upon by a return spring armature, which forms an axially movable valve member together with a valve needle.
  • a valve closing body is provided, which forms a sealing seat with a valve seat body.
  • No sealing body is provided between the magnetic coil and a valve housing, but a square-shaped stop ring.
  • This stop ring is inserted between a downstream end portion of the fixed inner pole and an end portion of the valve housing.
  • the tail of the inner pole and the end portion of the valve housing are formed so flange that an annular space is formed, in which the stop ring can be used accurately. In this case, the in FIG.
  • EP1797313 discloses another fuel injector having a cross-sectionally quadrangular elastomeric sealing body between the bobbin and a radially extending shoulder of the valve housing.
  • the fuel injection valve according to the invention with the characterizing features of the main claim has the advantage that between the valve body, a valve sleeve and a solenoid reliable sealing by a fuel-resistant elastomer is axially possible.
  • This seal is preferably made of rubber in cross-section square sealing body, which has the advantage that the sealing body used is simple and inexpensive.
  • Another advantage is that the sealing body within the fuel injector has only a small footprint, which is additionally reduced by the fact that the sealing body is clamped and pressed in the installed state after installation.
  • the sealing body is introduced in the region between an underside of a coil carrier receiving the magnetic coil, an outer circumferential surface of a valve sleeve and a radially extending shoulder of the valve housing. Im completely When installed, the sealing body largely fills this receiving area and guarantees safe and reliable sealing through its direct physical contact with these valve components.
  • the sealing body ultimately has an elliptical or egg-shaped cross-section in the compressed state.
  • the coil carrier can ideally have on its underside a circumferential collar or a plurality of nubs distributed over the circumference, which delimit the receiving region of the sealing body radially outwards.
  • FIG. 1 a schematic section through an embodiment of an inventively designed fuel injection valve
  • FIG. 2 a schematic partial section through the inventively designed fuel injection valve in the region of the section IV in FIG. 1 with a not yet pressed sealing body
  • FIG. 3 an enlarged view of the sealing body in cross section
  • FIG. 4 a schematic partial section through the inventively designed fuel injection valve in the region of the section IV in FIG. 1 with a pressed after installation in the installed state sealing body.
  • 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.
  • the fuel injection valve 1 comprises a solenoid coil 2 which is wound on a bobbin 3.
  • the bobbin 3 is in a cup-shaped valve housing 4, which serves as a magnet pot of the electromagnetic circuit, encapsulated.
  • the bobbin 3 is penetrated by a valve sleeve 5, which is designed tubular.
  • a valve sleeve 5 On the outflow side of an arranged in the valve sleeve 5 inner pole 6, an armature 7 is arranged, which is connected to a valve needle 8.
  • 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.
  • the armature 7 is acted upon in the resting state of the fuel injection valve 1 by a return spring 14 with a force such that the fuel injection valve 1 is held 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 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 part of an electrical connector plug 22 made of plastic, which can be molded with a plastic extrusion on the valve housing 4, on the valve sleeve 5 and on the supply pipe 24.
  • the Brennscherinspritzventill 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 ,
  • valve sleeve 5 is designed tubular. Between valve housing 4, coil support 3 and valve sleeve 5 according to the invention a sealing body 25 made of an elastomeric material, preferably made of rubber, is provided, which constitutes a reliable sealing of the valve sleeve 5 relative to the valve housing 4.
  • FIG. 2 shows a schematic partial section through the inventively designed fuel injector 1 in the region of the section IV in FIG. 1 with a not yet pressed sealing body 25.
  • the sealing body 25 is square-shaped and trapezoidally similar in cross-section. The installation of the sealing body 25 is carried out such that the sealing body 25 is inserted into the region between a bottom 27 of the bobbin 3, an outer circumferential surface 28 of the valve sleeve 5 and a radially extending shoulder 29 of the valve housing 4. While the valve housing 4 is already fastened or held on the valve sleeve 5, the coil carrier 3 with the magnetic coil 2 is pushed into the valve housing 4 only after the introduction of the sealing body 25. At this time, the sealing body 25 is in an unstressed state with a annular contour and a rectangular cross-section, as in FIG. 3 is shown before.
  • the sealing body 25 With an inner side 30 of the sealing body 25 is located on the outer surface 28 of the valve sleeve 5, wherein the inner side 30 and the lateral surface 28 are not exactly parallel.
  • the sealing body 25 rather extends with its inner side 30 slightly inclined to the longitudinal axis of the fuel injection valve 1 and thus inclined to the lateral surface 28 of the valve sleeve 5 and the outer side 31 of the sealing body 25. Therefore, the cross section of the sealing body 25 also describes no ideal trapezoid, but he has only close to this form.
  • the bobbin 3 facing upper side 32 of the sealing body 25 extends obliquely inclined to the longitudinal axis of the fuel injection valve 1, e.g.
  • the edges of the sealing body 25 are e.g. rounded, the radii of all rounded edges may be different.
  • the bobbin 3 has on its underside 27 a radially encircling collar 12 which is arranged radially outside of the sealing body 25 and which rests in a clamped state of the sealing body 25 on the shoulder 29 of the valve housing 4 ( FIG. 4 ).
  • a plurality of knobs may also be mounted radially symmetrically on the underside 27 of the coil carrier 3.
  • the time is finally reached at which the bobbin 3 touches with its bottom 27 for the first time the sealing body 25 at its highest point and in FIG. 2 is shown.
  • This highest point of the sealing body 25 is in the (rounded) edge region of the transition from the top 32 to the outside 31. From this point on, the sealing body 25 is deformed in the further assembly.
  • FIG. 4 shows a schematic partial section through the inventively designed fuel injector 1 in the region of the section IV in FIG. 1 with a compressed after installation in the installed state sealing body 25.
  • the elastomeric material of the sealing body 25 moves largely radially outward.
  • the material differs slightly in other directions, so that an optimal seal with the sealing body 25 according to the invention can be achieved.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Manufacturing & Machinery (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 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 connection pipe, 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 facing the end with 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 oben genannten 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 der Brennkraftmaschine zu Problemen wegen schlechter Abdichtung führen kann.A disadvantage of the fuel injection valve known from the above document is in particular that the preparation of the connections between the individual components of the fuel injection valve complicated and thus time consuming and costly is. Furthermore, the welded areas are thermally stressed and thereby lose their strength and flexural rigidity, which can lead to significant resonances due to differently strong housing parts and associated noise during operation of the fuel injection valve. Furthermore, causes a molded-in 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 in particular during turbo operation of the internal combustion engine.

Aus der US 5,918,818 A ist bereits ein Brennstoffeinspritzventil bekannt, das eine Magnetspule, die mit einem von einer Rückstellfeder beaufschlagten Anker zusammenwirkt, der zusammen mit einer Ventilnadel ein axial bewegliches Ventilteil bildet, aufweist. An der Ventilnadel ist ein Ventilschließkörper vorgesehen, der mit einem Ventilsitzkörper einen Dichtsitz bildet. Zwischen der Magnetspule und einem Ventilgehäuse ist dabei kein Dichtkörper vorgesehen, sondern ein viereckförmiger Anschlagring. Dieser Anschlagring ist zwischen einem stromabwärtigen Endstück des festen Innenpols und einem Endabschnitt des Ventilgehäuses eingebracht. Das Endstück des Innenpols und der Endabschnitt des Ventilgehäuses sind dabei so flanschartig ausgeformt, dass ein ringförmiger Zwischenraum gebildet ist, in den der Anschlagring passgenau eingesetzt werden kann. Dabei weist der in Figur 4 dargestellte Anschlagring eine viereckförmige Kontur auf, bei der asymmetrisch ein radial äußerer Bereich so weit über die untere Stirnfläche des Innenpols übersteht, dass er die Anschlagfunktion für den bei bestromter Magnetspule angezogenen Anker übernimmt. Das Anschlagelement mit seiner schräg geneigten Anschlagfläche muss im Betrieb des Einspritzventils millionenfach die Anschläge des Ankers auffangen und muss deswegen metallisch ausgebildet und zusätzlich gehärtet und mgw. mit Verschleißschutzschichten versehen sein. EP1797313 offenbart ein weiteres Brennstoffeinspritzventil mit einem im Querschnitt viereckförmigen Elastomer-Dichtkörper zwischen dem Spulenträger und einer radial verlaufenden Schulter des Ventilgehäuses.From the US 5,918,818 A a fuel injection valve is already known, which has a magnetic coil which cooperates with an acted upon by a return spring armature, which forms an axially movable valve member together with a valve needle. On the valve needle, a valve closing body is provided, which forms a sealing seat with a valve seat body. No sealing body is provided between the magnetic coil and a valve housing, but a square-shaped stop ring. This stop ring is inserted between a downstream end portion of the fixed inner pole and an end portion of the valve housing. The tail of the inner pole and the end portion of the valve housing are formed so flange that an annular space is formed, in which the stop ring can be used accurately. In this case, the in FIG. 4 shown stop ring on a quadrangular contour in which asymmetrically a radially outer region so far beyond the lower end face of the inner pole, that he takes over the stop function for the energized when energized solenoid armature. The stop element with its obliquely inclined abutment surface must catch millions of times the attacks of the armature during operation of the injector and therefore must be metallic and additionally hardened and mgw. be provided with wear protection layers. EP1797313 discloses another fuel injector having a cross-sectionally quadrangular elastomeric sealing body between the bobbin and a radially extending shoulder of the valve housing.

Vorteile der ErfindungAdvantages of the invention

Das erfindungsgemäße Brennstoffeinspritzventil mit den kennzeichnenden Merkmalen des Hauptanspruchs hat demgegenüber den Vorteil, dass zwischen dem Ventilgehäuse, einer Ventilhülse und einer Magnetspule eine zuverlässige Abdichtung durch ein kraftstoffbeständiges Elastomer axial möglich ist. Diese Abdichtung ist ein vorzugsweise aus Gummi gefertigter im Querschnitt viereckförmiger Dichtkörper, was den Vorteil hat, dass der verwendete Dichtkörper einfach und kostengünstig ist. Ein weiterer Vorteil besteht darin, dass der Dichtkörper innerhalb des Brennstoffeinspritzventils nur einen geringen Platzbedarf aufweist, der zusätzlich dadurch noch verringert wird, dass der Dichtkörper nach der Montage im eingebauten Zustand eingespannt und verpresst ist.The fuel injection valve according to the invention with the characterizing features of the main claim has the advantage that between the valve body, a valve sleeve and a solenoid reliable sealing by a fuel-resistant elastomer is axially possible. This seal is preferably made of rubber in cross-section square sealing body, which has the advantage that the sealing body used is simple and inexpensive. Another advantage is that the sealing body within the fuel injector has only a small footprint, which is additionally reduced by the fact that the sealing body is clamped and pressed in the installed state after installation.

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.

Von Vorteil ist es, den Dichtkörper weitgehend trapezähnlich auszuführen, wobei diese Querschnittskontur ausschließlich im unverspannten Zustand des Dichtkörpers vorliegt. Erfindungsgemäß ist der Dichtkörper in dem Bereich zwischen einer Unterseite eines die Magnetspule aufnehmenden Spulenträgers, einer äußeren Mantelfläche einer Ventilhülse und einer radial verlaufenden Schulter des Ventilgehäuses eingebracht. Im vollständig eingebauten Zustand füllt der Dichtkörper diesen Aufnahmebereich weitgehend aus und garantiert über seinen unmittelbaren Körperkontakt zu diesen Ventilbauteilen eine sichere und zuverlässige Abdichtung. Der Dichtkörper besitzt letztlich im verpressten Zustand einen ellipsen- bzw. eiförmigen Querschnitt.It is advantageous to perform the sealing body largely trapezoidal, this cross-sectional contour is present only in the unstressed state of the sealing body. According to the invention, the sealing body is introduced in the region between an underside of a coil carrier receiving the magnetic coil, an outer circumferential surface of a valve sleeve and a radially extending shoulder of the valve housing. Im completely When installed, the sealing body largely fills this receiving area and guarantees safe and reliable sealing through its direct physical contact with these valve components. The sealing body ultimately has an elliptical or egg-shaped cross-section in the compressed state.

Dabei kann der Spulenträger in idealer Weise an seiner Unterseite einen umlaufenden Kragen oder mehrere über den Umfang verteilte Noppen aufweisen, die den Aufnahmebereich des Dichtkörpers radial nach außen begrenzen.In this case, the coil carrier can ideally have on its underside a circumferential collar or a plurality of nubs distributed over the circumference, which delimit the receiving region of the sealing body radially outwards.

Zeichnungdrawing

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung vereinfacht dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen Figur 1 einen schematischen Schnitt durch ein Ausführungsbeispiel eines erfindungsgemäß ausgestalteten Brennstoffeinspritzventils; Figur 2 einen schematischen Teilschnitt durch das erfindungsgemäß ausgestaltete Brennstoffeinspritzventil im Bereich des Ausschnitts IV in Figur 1 mit einem noch nicht verpressten Dichtkörper, Figur 3 eine vergrößerte Darstellung des Dichtkörpers im Querschnitt und Figur 4 einen schematischen Teilschnitt durch das erfindungsgemäß ausgestaltete Brennstoffeinspritzventil im Bereich des Ausschnitts IV in Figur 1 mit einem nach der Montage im eingebauten Zustand verpressten Dichtkörper.An embodiment of the invention is shown in simplified form in the drawing and explained in more detail in the following description. Show it FIG. 1 a schematic section through an embodiment of an inventively designed fuel injection valve; FIG. 2 a schematic partial section through the inventively designed fuel injection valve in the region of the section IV in FIG. 1 with a not yet pressed sealing body, FIG. 3 an enlarged view of the sealing body in cross section and FIG. 4 a schematic partial section through the inventively designed fuel injection valve in the region of the section IV in FIG. 1 with a pressed after installation in the installed state sealing body.

Beschreibung des AusführungsbeispielsDescription of the embodiment

Nachfolgend wird ein erstes Ausführungsbeispiel der Erfindung anhand von Figur 1 beispielhaft beschrieben. Figur 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.Hereinafter, a first embodiment of the invention with reference to FIG. 1 described by way of example. 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, das als Magnettopf des elektromagnetischen Kreises dient, gekapselt.The fuel injection valve 1 comprises a solenoid coil 2 which is wound on a bobbin 3. The bobbin 3 is in a cup-shaped valve housing 4, which serves as a magnet pot of the electromagnetic circuit, encapsulated.

Der Spulenträger 3 wird von einer Ventilhülse 5 durchgriffen, die rohrförmig ausgestaltet ist. Abströmseitig eines in der Ventilhülse 5 angeordneten Innenpols 6 ist ein Anker 7 angeordnet, der mit einer Ventilnadel 8 verbunden ist. 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 bobbin 3 is penetrated by a valve sleeve 5, which is designed tubular. On the outflow side of an arranged in the valve sleeve 5 inner pole 6, an armature 7 is arranged, which is connected to a valve needle 8. 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 acted upon in the resting state of the fuel injection valve 1 by a return spring 14 with a force such that the fuel injection valve 1 is held 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. Die Magnetspule 2 wird über eine Leitung von einem über einen elektrischen Steckkontakt 21 zuführbaren elektrischen Strom erregt. Der Steckkontakt 21 ist Teil eines elektrischen Anschlusssteckers 22 aus Kunststoff, der über eine Kunststoffumspritzung am Ventilgehäuse 4, an der Ventilhülse 5 bzw. am Zuleitungsrohr 24 mit 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 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 part of an electrical connector plug 22 made of plastic, which can be molded with a plastic extrusion on the valve housing 4, on the valve sleeve 5 and 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 Innenpol 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 Brennstoffüber 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 inner pole 6 is closed. As a result of the movement of the armature 7, the valve needle 8 connected to the armature 7 is also taken along in the stroke direction, so that the valve closing body 10 lifts off from the valve seat body 11 and fuel is sprayed off via the injection opening 13.

Das Brennstoffeinspritzventill 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 Brennstoffeinspritzventill 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, Spulenträger 3 und Ventilhülse 5 ist erfindungsgemäß ein Dichtkörper 25 aus einem Elastomerwerkstoff, vorzugsweise aus Gummi, vorgesehen, der eine zuverlässige Abdichtung der Ventilhülse 5 gegenüber dem Ventilgehäuse 4 darstellt.The valve sleeve 5 is designed tubular. Between valve housing 4, coil support 3 and valve sleeve 5 according to the invention a sealing body 25 made of an elastomeric material, preferably made of rubber, is provided, which constitutes a reliable sealing of the valve sleeve 5 relative to the valve housing 4.

Figur 2 zeigt einen schematischen Teilschnitt durch das erfindungsgemäß ausgestaltete Brennstoffeinspritzventil 1 im Bereich des Ausschnitts IV in Figur 1 mit einem noch nicht verpressten Dichtkörper 25. Der Dichtkörper 25 ist viereckförmig und dabei trapezähnlich im Querschnitt ausgebildet. Der Einbau des Dichtkörpers 25 erfolgt derart, dass der Dichtkörper 25 in den Bereich zwischen einer Unterseite 27 des Spulenträgers 3, einer äußeren Mantelfläche 28 der Ventilhülse 5 und einer radial verlaufenden Schulter 29 des Ventilgehäuses 4 eingeschoben wird. Während das Ventilgehäuse 4 bereits an der Ventilhülse 5 befestigt bzw. festgehalten wird, wird der Spulenträger 3 mit der Magnetspule 2 erst nach dem Einbringen des Dichtkörpers 25 in das Ventilgehäuse 4 eingeschoben. Zu diesem Zeitpunkt liegt der Dichtkörper 25 in einem unverspannten Zustand mit einer ringförmigen Kontur und einem rechteckförmigen Querschnitt, wie er in Figur 3 gezeigt ist, vor. FIG. 2 shows a schematic partial section through the inventively designed fuel injector 1 in the region of the section IV in FIG. 1 with a not yet pressed sealing body 25. The sealing body 25 is square-shaped and trapezoidally similar in cross-section. The installation of the sealing body 25 is carried out such that the sealing body 25 is inserted into the region between a bottom 27 of the bobbin 3, an outer circumferential surface 28 of the valve sleeve 5 and a radially extending shoulder 29 of the valve housing 4. While the valve housing 4 is already fastened or held on the valve sleeve 5, the coil carrier 3 with the magnetic coil 2 is pushed into the valve housing 4 only after the introduction of the sealing body 25. At this time, the sealing body 25 is in an unstressed state with a annular contour and a rectangular cross-section, as in FIG. 3 is shown before.

Mit einer Innenseite 30 liegt der Dichtkörper 25 an der äußeren Mantelfläche 28 der Ventilhülse 5 an, wobei die Innenseite 30 und die Mantelfläche 28 nicht exakt parallel verlaufen. Der Dichtkörper 25 verläuft vielmehr mit seiner Innenseite 30 leicht geneigt zur Längsachse des Brennstoffeinspritzventils 1 und damit auch geneigt zur Mantelfläche 28 der Ventilhülse 5 bzw. zur Außenseite 31 des Dichtkörpers 25. Deshalb beschreibt der Querschnitt des Dichtkörpers 25 auch kein ideales Trapez, sondern er hat nur annährend diese Form. Die dem Spulenträger 3 zugewandte Oberseite 32 des Dichtkörpers 25 verläuft schräg geneigt zur Längsachse des Brennstoffeinspritzventils 1, z.B. unter einem Winkel von ca. 45°, während die der Schulter 29 zugewandte Unterseite 33 des Dichtkörpers 25 im rechten Winkel zur Längsachse des Brennstoffeinspritzventils 1 verläuft. Die Kanten des Dichtkörpers 25 sind z.B. abgerundet, wobei die Radien aller abgerundeten Kanten unterschiedlich sein können.With an inner side 30 of the sealing body 25 is located on the outer surface 28 of the valve sleeve 5, wherein the inner side 30 and the lateral surface 28 are not exactly parallel. The sealing body 25 rather extends with its inner side 30 slightly inclined to the longitudinal axis of the fuel injection valve 1 and thus inclined to the lateral surface 28 of the valve sleeve 5 and the outer side 31 of the sealing body 25. Therefore, the cross section of the sealing body 25 also describes no ideal trapezoid, but he has only close to this form. The bobbin 3 facing upper side 32 of the sealing body 25 extends obliquely inclined to the longitudinal axis of the fuel injection valve 1, e.g. at an angle of about 45 °, while the shoulder 29 facing the bottom 33 of the sealing body 25 extends at right angles to the longitudinal axis of the fuel injection valve 1. The edges of the sealing body 25 are e.g. rounded, the radii of all rounded edges may be different.

Der Spulenträger 3 weist an seiner Unterseite 27 einen radial umlaufenden Kragen 12 auf, der radial außerhalb des Dichtkörpers 25 angeordnet ist und der bei einem eingespannten Zustand des Dichtkörpers 25 an der Schulter 29 des Ventilgehäuses 4 anliegt (Figur 4). Alternativ zu einem umlaufenden Kragen 12 können auch mehrere Noppen radialsymmetrisch an der Unterseite 27 des Spulenträgers 3 angebracht sein.The bobbin 3 has on its underside 27 a radially encircling collar 12 which is arranged radially outside of the sealing body 25 and which rests in a clamped state of the sealing body 25 on the shoulder 29 of the valve housing 4 ( FIG. 4 ). As an alternative to a circumferential collar 12, a plurality of knobs may also be mounted radially symmetrically on the underside 27 of the coil carrier 3.

Beim Einbau des Dichtkörpers 25 bzw. beim Zusammenbau des Brennstoffeinspritzventils 1 wird irgendwann der Zeitpunkt erreicht, an dem der Spulenträger 3 mit seiner Unterseite 27 erstmalig den Dichtkörper 25 an seinem höchsten Punkt berührt und der in Figur 2 gezeigt ist. Dieser höchste Punkt des Dichtkörpers 25 liegt im (abgerundeten) Kantenbereich des Übergangs von der Oberseite 32 zur Außenseite 31. Von diesem Zeitpunkt an wird bei der weiteren Montage der Dichtkörper 25 verformt.When installing the sealing body 25 or during assembly of the fuel injection valve 1, the time is finally reached at which the bobbin 3 touches with its bottom 27 for the first time the sealing body 25 at its highest point and in FIG. 2 is shown. This highest point of the sealing body 25 is in the (rounded) edge region of the transition from the top 32 to the outside 31. From this point on, the sealing body 25 is deformed in the further assembly.

Figur 4 zeigt einen schematischen Teilschnitt durch das erfindungsgemäß ausgestaltete Brennstoffeinspritzventil 1 im Bereich des Ausschnitts IV in Figur 1 mit einem nach der Montage im eingebauten Zustand verpressten Dichtkörper 25. Bei seiner während der Montage erfolgenden Verformung wandert das Elastomermaterial des Dichtkörpers 25 weitgehend radial nach außen. Das Material weicht jedoch geringfügig auch in andere Richtungen aus, so dass eine optimale Abdichtung mit dem erfindungsgemäßen Dichtkörper 25 erzielbar ist. Durch den bei der Montage nach unten wandernden Kragen 12 des Spulenträgers 3 ist eine radial äußere Begrenzung für die Ausweichbewegung des Dichtkörpers 25 gegeben, so dass im vollständig eingebauten Zustand der Dichtkörper 25 eingespannt und verpresst zwischen der Unterseite 27 des Spulenträgers 3, dem Kragen 12 des Spulenträgers 3, der Schulter 29 des Ventilgehäuses 4 und der äußeren Mantelfläche 28 der Ventilhülse 5 mit Körperkontakt zu diesen Bauteilen vorliegt. Die Größe des Kragens 12 legt insofern den Grad der Verformung des Dichtkörpers 25 fest. Die im Querschnitt viereckförmige Kontur des Dichtkörpers 25 im Ausgangszustand ist im eingebauten und verpressten Zustand in gewisser Weise aufgehoben, da der Dichtkörper 25 nun einen ellipsen- bzw. eiförmigen Querschnitt besitzt. FIG. 4 shows a schematic partial section through the inventively designed fuel injector 1 in the region of the section IV in FIG. 1 with a compressed after installation in the installed state sealing body 25. In its occurring during assembly deformation of the elastomeric material of the sealing body 25 moves largely radially outward. However, the material differs slightly in other directions, so that an optimal seal with the sealing body 25 according to the invention can be achieved. By moving during mounting down collar 12 of the bobbin 3 is given a radially outer boundary for the evasive movement of the sealing body 25, so that in the fully installed state of the sealing body 25 is clamped and pressed between the bottom 27 of the bobbin 3, the collar 12 of the Spool carrier 3, the shoulder 29 of the valve housing 4 and the outer circumferential surface 28 of the valve sleeve 5 is present with body contact to these components. The size of the collar 12 sets so far the degree of deformation of the sealing body 25 fixed. The square cross-section contour of the sealing body 25 in the initial state is repealed in the installed and compressed state in a certain way, since the sealing body 25 now has an elliptical or egg-shaped cross-section.

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

Claims (9)

  1. Fuel injection valve (1) having a magnet coil (2) which interacts with an armature (7), which armature is acted on by a restoring spring (14) and, together with a valve needle (8), forms an axially movable valve part, wherein, on the valve needle (8), there is provided a valve closing body (10) which, with a valve seat body (11), forms a sealing seat, wherein
    a sealing body (25) which is of tetragonal cross section and which is composed of a fuel-resistant elastomer material, in particular rubber, is inserted between the magnet coil (2) and a valve housing (4), wherein the valve housing (4) comprises a radially running shoulder (29) which engages under the magnet coil (2), and the sealing body (25) is pushed into the region between a bottom side (27) of a coil carrier (3) and the radially running shoulder (29) of the valve housing (4),
    characterized
    in that the sealing body (25) has an elliptical or egg-shaped cross section when in the installed and compressed state.
  2. Fuel injection valve according to Claim 1,
    characterized
    in that the sealing body (25) is of ring-shaped encircling form and has a trapezium-like cross section when in the non-braced state.
  3. Fuel injection valve according to Claim 2,
    characterized
    in that the sealing body (25) has an inner side (30), an outer side (31), a top side (32) and a bottom side (33), wherein the greatest axial extent of the sealing body (25) is situated between the transitions of the outer side (31) to the top side (32) and the bottom side (33).
  4. Fuel injection valve according to Claim 2 or 3,
    characterized
    in that the inner side (30) and the outer side (31) do not run parallel to one another.
  5. Fuel injection valve according to one of the preceding claims,
    characterized
    in that the edges of the sealing body (25) are rounded.
  6. Fuel injection valve according to Claim 5,
    characterized
    in that the radii of the rounded edges of the sealing body (25) differ.
  7. Fuel injection valve according to one of the preceding claims,
    characterized
    in that the sealing body (25) is inserted into the region between a bottom side (27) of a coil carrier (3) accommodating the magnet coil (2), an outer shell surface (28) of a valve sleeve (5), and a radially running shoulder (29) of the valve housing (4).
  8. Fuel injection valve according to Claim 7,
    characterized
    in that the coil carrier (3) has, on its bottom side (27), an encircling collar (12) or multiple studs distributed over the circumference, which studs delimit the receiving region of the sealing body (25) in a radially outward direction.
  9. Fuel injection valve according to Claim 8,
    characterized
    in that the sealing body (25), when in the fully installed state, is braced between the bottom side (27) of the coil carrier (3), the collar (12) or the studs of the coil carrier (3), the outer shell surface (28) of the valve sleeve (5) and the shoulder (29) of the valve housing (4), so as to be in physical contact with said components.
EP06777975.1A 2005-08-04 2006-07-26 Fuel injection valve Active EP1913252B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005037319A DE102005037319A1 (en) 2005-08-04 2005-08-04 Fuel injector
PCT/EP2006/064660 WO2007014887A1 (en) 2005-08-04 2006-07-26 Fuel injection valve

Publications (2)

Publication Number Publication Date
EP1913252A1 EP1913252A1 (en) 2008-04-23
EP1913252B1 true EP1913252B1 (en) 2017-09-13

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US (1) US8770498B2 (en)
EP (1) EP1913252B1 (en)
JP (1) JP4741670B2 (en)
DE (1) DE102005037319A1 (en)
WO (1) WO2007014887A1 (en)

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Publication number Priority date Publication date Assignee Title
JP4897728B2 (en) * 2008-03-18 2012-03-14 株式会社ケーヒン Electromagnetic fuel injection valve
DE102009000872B4 (en) * 2009-02-16 2018-05-30 Robert Bosch Gmbh Injector
DE102012204305A1 (en) * 2012-03-19 2013-09-19 Robert Bosch Gmbh A sealed over-molded component and method for producing such a component
EP2940286A1 (en) * 2014-05-01 2015-11-04 Delphi International Operations Luxembourg S.à r.l. Fuel injector filter

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JP2003269290A (en) * 2002-03-19 2003-09-25 Denso Corp Fuel injection valve
EP1797313A1 (en) * 2004-09-29 2007-06-20 Robert Bosch Gmbh Fuel injection valve

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JP2521825Y2 (en) * 1991-02-28 1997-01-08 愛三工業株式会社 Fuel injection device
JPH0849624A (en) * 1994-06-01 1996-02-20 Zexel Corp Fuel invasion preventing device for electromagnetic fuel injection valve
US5918818A (en) * 1996-05-22 1999-07-06 Denso Corporation Electromagnetically actuated injection valve
JPH1144275A (en) * 1997-07-03 1999-02-16 Zexel Corp Solenoid valve for fuel injection device
DE19744739A1 (en) * 1997-10-10 1999-04-15 Bosch Gmbh Robert Fuel injection valve for internal combustion engine
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JPH11280592A (en) * 1998-03-25 1999-10-12 Unisia Jecs Corp Fuel injector
JP3945357B2 (en) * 2002-09-18 2007-07-18 株式会社デンソー Fuel injection device
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JP2003269290A (en) * 2002-03-19 2003-09-25 Denso Corp Fuel injection valve
EP1797313A1 (en) * 2004-09-29 2007-06-20 Robert Bosch Gmbh Fuel injection valve

Also Published As

Publication number Publication date
EP1913252A1 (en) 2008-04-23
US8770498B2 (en) 2014-07-08
DE102005037319A1 (en) 2007-02-08
JP4741670B2 (en) 2011-08-03
WO2007014887A1 (en) 2007-02-08
US20090179091A1 (en) 2009-07-16
JP2009508030A (en) 2009-02-26

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