EP0222131B1 - Electromagnetically actuated fuel injection valve - Google Patents

Electromagnetically actuated fuel injection valve Download PDF

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Publication number
EP0222131B1
EP0222131B1 EP86113487A EP86113487A EP0222131B1 EP 0222131 B1 EP0222131 B1 EP 0222131B1 EP 86113487 A EP86113487 A EP 86113487A EP 86113487 A EP86113487 A EP 86113487A EP 0222131 B1 EP0222131 B1 EP 0222131B1
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EP
European Patent Office
Prior art keywords
valve
valve needle
fuel injection
hollow space
closing element
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
Application number
EP86113487A
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German (de)
French (fr)
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EP0222131A3 (en
EP0222131A2 (en
Inventor
Andreas Sausner
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Mannesmann VDO AG
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Mannesmann VDO AG
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Publication date
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Priority to AT86113487T priority Critical patent/ATE49033T1/en
Publication of EP0222131A2 publication Critical patent/EP0222131A2/en
Publication of EP0222131A3 publication Critical patent/EP0222131A3/en
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Publication of EP0222131B1 publication Critical patent/EP0222131B1/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
    • F02M51/0675—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 valve body having cylindrical guiding or metering portions, e.g. with fuel passages
    • F02M51/0678—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 valve body having cylindrical guiding or metering portions, e.g. with fuel passages all portions having fuel passages, e.g. flats, grooves, diameter reductions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
    • F02M51/0625—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
    • F02M51/0664—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding
    • F02M51/0685—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding the armature and the valve being allowed to move relatively to each other or not being attached to each other
    • 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
    • F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
    • F02M61/10—Other injectors with elongated valve bodies, i.e. of needle-valve type
    • F02M61/12—Other injectors with elongated valve bodies, i.e. of needle-valve type characterised by the provision of guiding or centring means for valve bodies
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S239/00—Fluid sprinkling, spraying, and diffusing
    • Y10S239/90—Electromagnetically actuated fuel injector having ball and seat type valve

Definitions

  • the invention relates to an electromagnetically actuated fuel injection valve for injection systems of internal combustion engines, with a spherical segment-shaped closing member which is connected via a valve needle to an armature of an electromagnet fastened thereon and a spring acting in the closing direction, the closing member being perpendicular to the axis of the valve needle while overcoming the Stiction is displaceable and the end surface of the valve needle is flat.
  • Such a fuel injector representing the generic term is known from GB-A 2 080 415.
  • the embodiments of the valve closing member disclosed therein have an essentially spherical section-like shape, the spherical section cooperating with the conical valve seat, while the surface delimiting the spherical section lies against the flat surface of the valve needle.
  • valve seat and the surface of the valve closing member delimiting the spherical section creates a tilting moment on the valve closing member in the event of a radial offset from the restoring force, which makes perfect sealing difficult. This is particularly the case if the direction of the valve axis deviates from the direction of the axis of the valve seat.
  • the closing member therefore has a cavity delimited by a flat surface, on which the end surface of the valve needle rests.
  • the arrangement is such that both surfaces, namely the surface of the closing member delimiting the cavity and the end surface of the valve needle are located approximately in the plane of the valve seat.
  • a self-centering valve member with support of the valve member in the plane of the valve seat is known from US-A 1 942 417, but it is a check valve for a sewage pump.
  • the end of the valve needle protruding into the cavity of the closing member is designed in the form of a stamp, the opening of the cavity has a smaller diameter than the cavity itself and the stamped end of the valve needle has a diameter which is smaller than the diameter of the cavity , but larger than the diameter of the opening.
  • the closing member consists of two parts, one part of which is approximately hemispherical and faces the valve seat and the other part, which is arranged coaxially with the first part, comprises the opening of the cavity.
  • a spring element is then preferably inserted between the stamp-shaped end of the valve needle and the part of the closing element which forms the opening of the cavity.
  • a fuel injection nozzle for internal combustion engines in which a spool is provided on a valve needle downstream of the actual valve sealing cone and is coupled to the valve needle in such a way that it can be displaced radially to the valve needle within narrow limits.
  • a tube 1, a flange-like part 2 of the tube 1 and the housing 3 form a magnetically conductive core for the magnet coil 4, which is arranged on a winding body 5.
  • Seals 6, 7 are provided between the winding body 5 on the one hand and the tube 1 and the housing 3 on the other hand.
  • the tube 1 also serves as a connection for the fuel line.
  • a plastic body 9 forms, together with a contact 10, the electrical connection for the magnet coil 4.
  • a valve needle 12 is mounted in a guide part 11 and is pressed with its lower part against the valve seat 14 by a coil spring 13.
  • the valve seat 14 is part of a spray opening 15 provided in the guide part 11, which continues in an opening of the cap 16.
  • An armature 17 is provided at the end of the valve needle 12 opposite the spray opening 15, which armature is drawn against the spring force in the direction of the tube 1 when the solenoid 4 is energized and thus opens the valve.
  • valve needle 12 In known fuel injection valves, the end of the valve needle serving as the closing member is now conical, so that it rests in an annular shape on the surface of the valve seat 14. In order to achieve a sufficient sealing effect, extremely small manufacturing tolerances must be observed both for the valve needle 12 itself and for the guide member 11.
  • a closing member 18 is connected to the valve needle 12 in such a way that it can be displaced perpendicularly with respect to the axis of the valve needle 12.
  • a hemispherical closing member 18 is provided in the fuel injection valve according to FIG. 1, which is attached to the valve needle 12 in a manner explained in connection with FIG. 2.
  • Fig. 2 shows on a larger scale than Fig. 1 a section through the closing member 18.
  • the closing member 18 consists of a substantially hemispherical part 19 and a part 20.
  • the closing member 18 forms a cavity 21 in which the valve needle 12 with its stamped end 22 protrudes. Both the diameter of the cavity 21 and the diameter of the opening 23 in the part 20 are chosen so large that the closing member 18 can move relative to the axis of the valve needle 12 as far as is necessary with regard to the tolerances of the valve needle 12 and their storage .
  • An annular spring 24 ensures that the end surface 25 of the valve needle is pressed against the surface 26 of the hemispherical part 19.
  • the pressure force is so great that the closing member 18 does not move with respect to the valve needle 12 when the valve is open.
  • the adhesive force generated by the pressure is therefore greater than the forces which occur when the valve is open, for example due to vibrations, and which could cause a shift.
  • the closing element is therefore not readjusted with every closing operation, but only when it is necessary. An initial adjustment is therefore carried out with the first start-up, for example during the test after the fuel injector has been installed. Further adjustments are only made if changes occur during the service life of the fuel injector.
  • FIG. 3 the closing member 18, the valve block 14 and the valve needle 12 are shown for different, each greatly exaggerated storage of the valve needle axis.
  • the valve needle axis is displaced parallel to its nominal position.
  • the arrangement is shown in a phase of movement of the closing process in which the closing element 18 not lying in the axis touches the valve seat 14 on one side.
  • the closing member 18 then slides into the valve seat 14 with simultaneous displacement relative to the valve needle axis and is thus adjusted.
  • valve needle axis is tilted, which in itself could be compensated for by the hemispherical closing member 18.
  • the tilting did not take place around the center of the ball, there is at the same time a displacement of the valve needle axis from the valve axis in the region of the closing member. This is compensated for by the displacement of the closing member 18 on the valve needle 12.

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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)
  • Fuel-Injection Apparatus (AREA)
  • Magnetically Actuated Valves (AREA)

Abstract

In an electromagnetically actuatable fuel-injection valve for injection systems of internal-combustion engines, the valve has an electromagnet, an armature, and a closure element which is operatively connected to a spring and the armature. The closure element is connected to a valve needle by a connection permitting displacement perpendicularly to the axis of the valve needle. The closure element, which has the shape of a spherical segment, is preferably displaceable while overcoming static friction so that automatic adjustment takes place only upon being placed initially in operation, and upon subsequent changes in mating surfaces of closure element and valve seat.

Description

Die Erfindung bezieht sich auf ein elektromagnetisch betätigbares Kraftstoffeinspritzventil für Einspritzanlagen von Brennkraftmaschinen, mit einem kugelabschnittförmigen Schließglied, welches über eine Ventilnadel mit einem darauf befestigten Anker eines Elektromagneten und einer in Schließrichtung wirkenden Feder verbunden ist, wobei das Schließglied senkrecht zur Achse der Ventilnadel unter Uberwindung der Haftreibung verschiebbar ist und die Endfläche der Ventilnadel eben ist.The invention relates to an electromagnetically actuated fuel injection valve for injection systems of internal combustion engines, with a spherical segment-shaped closing member which is connected via a valve needle to an armature of an electromagnet fastened thereon and a spring acting in the closing direction, the closing member being perpendicular to the axis of the valve needle while overcoming the Stiction is displaceable and the end surface of the valve needle is flat.

Ein solches den Gattungsbegriff darstellendes Kraftstoffeinspritzventil ist aus der GB-A 2 080 415 bekannt. Die dort offenbarten Ausführungsformen des Ventilschließgliedes weisen im wesentlichen kugeiabschnittförmige Gestalt auf, wobei der Kugelabschnitt mit dem konischen Ventilsitz zusammenwirkt, während die den Kugelabschnitt begrenzende Fläche an der ebenen Fläche der Ventilnadel anliegt.Such a fuel injector representing the generic term is known from GB-A 2 080 415. The embodiments of the valve closing member disclosed therein have an essentially spherical section-like shape, the spherical section cooperating with the conical valve seat, while the surface delimiting the spherical section lies against the flat surface of the valve needle.

Durch die Anordnung des Ventilsitzes und der den Kugelabschnitt begrenzenden Fläche des Ventilschließgliedes entsteht bei radialem Versatz aus der Rückstellkraft ein Kippmoment auf das Ventilschließglied, das die einwandfreie Abdichtung erschwert. Dies ist insbesondere dann der Fall, wenn die Richtung der Ventilachse von der Richtung der Achse des Ventilsitzes abweicht.The arrangement of the valve seat and the surface of the valve closing member delimiting the spherical section creates a tilting moment on the valve closing member in the event of a radial offset from the restoring force, which makes perfect sealing difficult. This is particularly the case if the direction of the valve axis deviates from the direction of the axis of the valve seat.

Das Schließglied weist daher gemäß der Erfindung einen durch eine ebene Fläche begrenzten Hohlraum auf, auf der die Endfläche der Ventilnadel aufliegt. Dabei ist die Anordnung so getroffen, daß sich beide Flächen, nämlich die den Hohlraum begrenzende Fläche des Schließgliedes und die Endfläche der Ventilnadel etwa in der Ebene des Ventilsitzes befinden. Diese Ausbildung gestattet neben dem Ausgleich einer Ablage der Ventilnadel in radialer Richtung auch einen Ausgleich einer abweichenden Richtung der Ventilnadelachse von der Achse des Ventilsitzes.According to the invention, the closing member therefore has a cavity delimited by a flat surface, on which the end surface of the valve needle rests. The arrangement is such that both surfaces, namely the surface of the closing member delimiting the cavity and the end surface of the valve needle are located approximately in the plane of the valve seat. In addition to the compensation of a depositing of the valve needle in the radial direction, this design also allows compensation of a deviating direction of the valve needle axis from the axis of the valve seat.

Ein selbstzentrierendes Ventilglied mit Abstützung des Ventilgliedes in der Ebene des Ventilsitzes ist zwar aus der US-A 1 942 417 bekannt, dabei handelt es sich jedoch um ein Rückschlagventil für eine Abwasserpumpe.A self-centering valve member with support of the valve member in the plane of the valve seat is known from US-A 1 942 417, but it is a check valve for a sewage pump.

Gemäß einer Weiterbildung der Erfindung ist das in den Hohlraum des Schließgliedes hineinragende Ende der Ventilnadel stempelförmig ausgebildet, die Öffnung des Hohlraums weist einen kleineren Durchmesser auf als der Hohlraum selbst und das stempelförmige Ende der Ventilnadel weist einen Durchmesser auf, welcher kleiner als der Durchmesser des Hohlraums, jedoch größer als der Durchmesser der Öffnung ist.According to a further development of the invention, the end of the valve needle protruding into the cavity of the closing member is designed in the form of a stamp, the opening of the cavity has a smaller diameter than the cavity itself and the stamped end of the valve needle has a diameter which is smaller than the diameter of the cavity , but larger than the diameter of the opening.

Schließlich beschäftigt sich eine Weiterbildung der Erfindung damit, daß das Schließglied aus zwei Teilen besteht, wovon ein Teil etwa halbkugelförmig ist und dem Ventilsitz gegenübersteht und das andere zum ersten Teil gleichachsig angeordnete Teil die Öffnung des Hohlraums umfaßt. Diese Weiterbildung trägt wesentlich zur einfachen und wirtschaftlichen Herstellbarkeit des erfindungsgemäßen Kraftstoffeinspritzventils bei.Finally, a development of the invention is concerned with the fact that the closing member consists of two parts, one part of which is approximately hemispherical and faces the valve seat and the other part, which is arranged coaxially with the first part, comprises the opening of the cavity. This development contributes significantly to the simple and economical manufacturability of the fuel injection valve according to the invention.

Vorzugsweise ist dann ein Federelement zwischen das stempelförmige Ende der Ventilnadel und den die Öffnung des Hohlraums bildenden Teil des Schließglieds eingelegt. Gemäß dieser Weiterbildung läßt sich die Erfindung in einfacher Weise mit wenigen Teilen verwirklichen.A spring element is then preferably inserted between the stamp-shaped end of the valve needle and the part of the closing element which forms the opening of the cavity. According to this development, the invention can be implemented in a simple manner with a few parts.

Aus der DE-A 2 726 308 ist eine Kraftstoffeinspritzdüse für Brennkraftmaschinen bekannt, bei der stromab des eigentlichen Ventildichtkegels an einer Ventilnadel ein Zapfenschieber vorgesehen ist, der so mit der Ventilnadel gekoppelt ist, daß er in engen Grenzen radial zu dieser verschiebbar ist.From DE-A 2 726 308 a fuel injection nozzle for internal combustion engines is known, in which a spool is provided on a valve needle downstream of the actual valve sealing cone and is coupled to the valve needle in such a way that it can be displaced radially to the valve needle within narrow limits.

Die offenbarte Kopplung durch Kugel- oder Kreuzgelenke bedingt eine Eigenführung des Zapfenschiebers in der entsprechenden Bohrung, die bei einem kugelabschnittförmigen Schließglied nicht gegeben ist.The coupling disclosed by ball or universal joints requires self-guidance of the pin slide in the corresponding bore, which is not the case with a closing element in the form of a spherical segment.

Die Erfindung läßt zahlreiche Ausführungsformen zu. Eine davon ist schematisch in der Zeichnung an Hand mehrerer Figuren dargestellt und nachfolgend beschrieben. Es zeigt:

  • Fig. 1 einen Schnitt durch ein Kraftstoffeinspritzventil,
  • Fig. 2 in vergrößerter Darstellung das Schließglied, den Ventilsitz und einen Teil der Ventilnadel sowie
  • Fig. 3 die gleichen Teile, jedoch bei Ablagen der Ventilnadel, welche der Ubersichtlichkeit halber stark übertrieben sind.
The invention allows numerous embodiments. One of them is shown schematically in the drawing using several figures and described below. It shows:
  • 1 shows a section through a fuel injection valve,
  • Fig. 2 in an enlarged view the closing member, the valve seat and part of the valve needle and
  • Fig. 3 shows the same parts, but with the valve needle, which are greatly exaggerated for clarity.

Gleiche Teile sind in den Figuren mit gleichen Bezugszeichen versehen.Identical parts are provided with the same reference symbols in the figures.

Bei dem in Fig. 1 dargestellten Kraftstoffeinspritzventil bilden ein Rohr 1, ein flanschartiger Teil 2 des Rohres 1 und das Gehäuse 3 einen magnetisch leitenden Kern für die Magnetspule 4, welche auf einem Wickelkörper 5 angeordnet ist. Zwischen dem Wickelkörper 5 einerseits und dem Rohr 1 und dem Gehäuse 3 andererseits sind Dichtungen 6, 7 vorgesehen.In the fuel injection valve shown in FIG. 1, a tube 1, a flange-like part 2 of the tube 1 and the housing 3 form a magnetically conductive core for the magnet coil 4, which is arranged on a winding body 5. Seals 6, 7 are provided between the winding body 5 on the one hand and the tube 1 and the housing 3 on the other hand.

Das Rohr 1 dient mit seiner Verlängerung 8 gleichzeitig als Anschluß für die Kraftstoffleitung. Ein Kunststoffkörper 9 bildet zusammen mit einem Kontakt 10 den elektrischen Anschluß für die Magnetspule 4.With its extension 8, the tube 1 also serves as a connection for the fuel line. A plastic body 9 forms, together with a contact 10, the electrical connection for the magnet coil 4.

In einem Führungsteil 11 ist eine Ventilnadel 12 gelagert, welche von einer Schraubenfeder 13 mit ihrem unteren Teil gegen den Ventilsitz 14 gepreßt wird. Der Ventilsitz 14 ist Teil einer im Führungsteil 11 vorgesehenen Abspritzöffnung 15, welche sich in einer Öffnung der Kappe 16 fortsetzt.A valve needle 12 is mounted in a guide part 11 and is pressed with its lower part against the valve seat 14 by a coil spring 13. The valve seat 14 is part of a spray opening 15 provided in the guide part 11, which continues in an opening of the cap 16.

Am von der Abspritzöffnung 15 entgegengesetzten Ende der Ventilnadel 12 ist ein Anker 17 vorgesehen, welcher bei Bestromung der Magnetspule 4 entgegen der Federkraft in Richtung auf das Rohr 1 gezogen wird und damit das Ventil öffnet.An armature 17 is provided at the end of the valve needle 12 opposite the spray opening 15, which armature is drawn against the spring force in the direction of the tube 1 when the solenoid 4 is energized and thus opens the valve.

Bei bekannten Kraftstoffeinspritzventilen ist nun das als Schließglied dienende Ende der Ventilnadel konisch ausgebildet, so daß es kreisringförmig auf der Fläche des Ventilsitzes 14 aufliegt. Um dabei eine ausreichende Dichtwirkung zu erzielen, sind sowohl bei der Ventilnadel 12 selbst als auch bei dem Führungsglied 11 äußerst geringe Fertigungstoleranzen zu beachten. Gemäß der Erfindung ist nun ein Schließglied 18 derart mit der Ventilnadel 12 verbunden, daß es senkrecht gegenüber der Achse der Ventilnadel 12 verschiebbar ist. Hierzu ist bei dem Kraftstoffeinspritzventil nach Fig. 1 ein halbkugelförmiges Schließglied 18 vorgesehen, welches an der Ventilnadel 12 in im Zusammenhang mit Fig. 2 erläuterter Weise befestigt ist.In known fuel injection valves, the end of the valve needle serving as the closing member is now conical, so that it rests in an annular shape on the surface of the valve seat 14. In order to achieve a sufficient sealing effect, extremely small manufacturing tolerances must be observed both for the valve needle 12 itself and for the guide member 11. According to the invention is now a closing member 18 is connected to the valve needle 12 in such a way that it can be displaced perpendicularly with respect to the axis of the valve needle 12. For this purpose, a hemispherical closing member 18 is provided in the fuel injection valve according to FIG. 1, which is attached to the valve needle 12 in a manner explained in connection with FIG. 2.

Fig. 2 stellt im größeren Maßstab als Fig. 1 einen Schnitt durch das Schließglied 18 dar. Das Schließglied 18 besteht aus einem im wesentlichen halbkugelförmigen Teil 19 und einem Teil 20. Das Schließglied 18 bildet einen Hohlraum 21, in welchen die Ventilnadel 12 mit ihrem stempelförmig ausgebildeten Ende 22 hineinragt. Sowohl der Durchmesser des Hohlraums 21 sowie der Durchmesser der Öffnung 23 im Teil 20 sind derart groß gewählt, daß sich das Schließglied 18 gegenüber der Achse der Ventilnadel 12 soweit verschieben kann, wie es im Hinblick auf die Toleranzen der Ventilnadel 12 sowie deren Lagerung erforderlich ist.Fig. 2 shows on a larger scale than Fig. 1 a section through the closing member 18. The closing member 18 consists of a substantially hemispherical part 19 and a part 20. The closing member 18 forms a cavity 21 in which the valve needle 12 with its stamped end 22 protrudes. Both the diameter of the cavity 21 and the diameter of the opening 23 in the part 20 are chosen so large that the closing member 18 can move relative to the axis of the valve needle 12 as far as is necessary with regard to the tolerances of the valve needle 12 and their storage .

Eine Ringfeder 24 sorgt dafür, daß die Endfläche 25 der Ventilnadel an die Fläche 26 des halbkugelförmigen Teils 19 angedrückt wird. Dabei ist die Andruckkraft derart groß, daß sich das Schließglied 18 gegenüber der Ventilnadel 12 nicht bei geöffnetem Ventil verschiebt. Die mit dem Andruck erzeugte Haftkraft ist also größer, als die Kräfte, welche bei geöffnetem Ventil, beispielsweise durch Vibrationen, auftreten und eine Verschiebung verursachen könnten. Das Schließglied wird also nicht bei jedem Schließvorgang neu justiert, sondern nur dann, wenn es erforderlich ist. Eine erstmalige Justierung erfolgt also mit der ersten Inbetriebnahme, beispielsweise bei der Prüfung nach der Montage des Kraftstoffeinspritzventils. Weitere Justierungen erfolgen dann erst, wenn sich im Laufe der Lebensdauer des Kraftstoffeinspritzventils Änderungen ergeben.An annular spring 24 ensures that the end surface 25 of the valve needle is pressed against the surface 26 of the hemispherical part 19. The pressure force is so great that the closing member 18 does not move with respect to the valve needle 12 when the valve is open. The adhesive force generated by the pressure is therefore greater than the forces which occur when the valve is open, for example due to vibrations, and which could cause a shift. The closing element is therefore not readjusted with every closing operation, but only when it is necessary. An initial adjustment is therefore carried out with the first start-up, for example during the test after the fuel injector has been installed. Further adjustments are only made if changes occur during the service life of the fuel injector.

In Fig. 3 ist das Schließglied 18, der Ventilstz 14 und die Ventilnadel 12 für verschiedene jeweils stark übertriebene Ablagen der Ventilnadelachse dargestellt. Bei der Darstellung nach Fig. 3a ist die Ventilnadelachse gegenüber ihrer Sollage parallel verschoben. Die Anordnung wird in einer Bewegungsphase des Schließvorgangs gezeigt, bei welcher das nicht in der Achse liegende Schließglied 18 einseitig den Ventilsitz 14 berührt. Wie ohne weiteres ersichtlich ist, gleitet danach das Schließglied 18 unter gleichzeitiger Verschiebung gegenüber der Ventilnadelachse in den Ventilsitz 14 und wird damit justiert.In Fig. 3, the closing member 18, the valve block 14 and the valve needle 12 are shown for different, each greatly exaggerated storage of the valve needle axis. In the representation according to FIG. 3a, the valve needle axis is displaced parallel to its nominal position. The arrangement is shown in a phase of movement of the closing process in which the closing element 18 not lying in the axis touches the valve seat 14 on one side. As can be readily seen, the closing member 18 then slides into the valve seat 14 with simultaneous displacement relative to the valve needle axis and is thus adjusted.

In Fig. 3b ist die Ventilnadelachse gekippt, was an sich bereits durch das halbkugelförmige Schließglied 18 ausgeglichen werden könnte. Da das Kippen jedoch nicht um den Kugelmittelpunkt erfolgte, liegt im Bereich des Schließglieds gleichzeitig eine Verschiebung der Ventilnadelachse aus der Ventilachse vor. Diese wird durch die Verschiebung des Schließglieds 18 auf der Ventilnadel 12 ausgeglichen.In Fig. 3b, the valve needle axis is tilted, which in itself could be compensated for by the hemispherical closing member 18. However, since the tilting did not take place around the center of the ball, there is at the same time a displacement of the valve needle axis from the valve axis in the region of the closing member. This is compensated for by the displacement of the closing member 18 on the valve needle 12.

Claims (4)

1. Electromagnetically actuated fuel injection valve for injection systems of internal-combustion engines, with a spherical segment-shaped closing element (18), which is connected via a valve needle (12) to an armature (17), fastened thereupon, of an electromagnet (1-5) and a spring (13) acting in closing direction, the closing element (18) being displaceable perpendicularly to the axis of the valve needle (12) by overcoming static friction and the end surface (25) of the valve needle being flat, characterized in that the closing element (18) has a hollow space (21) bounded by a flat surface (26), on which the end surface (25) of the valve needle (12) lies and in that, with closed fuel injection valve, both surfaces (25, 26) are approximately in the plane of the valve seat (14).
2. Electromagnetically actuated fuel injection valve according to Claim 1, characterized in that the end (22) of the valve needle (12) protruding into the hollow space (21) of the closing element is designed in the shape of a ram and in that the opening (23) of the hollow space (21) has a smaller diameter than the hollow space (21) itself and in the ram-shaped end (22) of the valve needle (12) has a diameter which is smaller than the diameter of the hollow space (21) but larger than the diameter of the opening (23).
3. Electromagnetically actuated fuel injection valve according to Claim 2, characterized in that the closing element (18) consists of two parts (19, 20), of which one part (19) is approximately hemispherical and located opposite the valve seat (14) and the other part (20), arranged coaxially to the first part (19), comprises the opening (23) of the hollow space (21).
4. Electromagnetically actuated fuel injection valve according to Claim 2 or 3, characterized in that a spring element (24) is inserted between the ram-shaped end (22) of the valve needle (12) and the part (20) of the closing element (18) forming the opening (23) of the hollow space (21).
EP86113487A 1985-11-04 1986-10-01 Electromagnetically actuated fuel injection valve Expired EP0222131B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86113487T ATE49033T1 (en) 1985-11-04 1986-10-01 ELECTROMAGNETICALLY ACTUATED FUEL INJECTION VALVE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3539057 1985-11-04
DE19853539057 DE3539057A1 (en) 1985-11-04 1985-11-04 ELECTROMAGNETICALLY ACTUABLE FUEL INJECTION VALVE

Publications (3)

Publication Number Publication Date
EP0222131A2 EP0222131A2 (en) 1987-05-20
EP0222131A3 EP0222131A3 (en) 1987-11-11
EP0222131B1 true EP0222131B1 (en) 1989-12-27

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ID=6285117

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EP86113487A Expired EP0222131B1 (en) 1985-11-04 1986-10-01 Electromagnetically actuated fuel injection valve

Country Status (6)

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US (1) US4759331A (en)
EP (1) EP0222131B1 (en)
JP (1) JPS62107267A (en)
AT (1) ATE49033T1 (en)
BR (1) BR8605409A (en)
DE (2) DE3539057A1 (en)

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Also Published As

Publication number Publication date
DE3667814D1 (en) 1990-02-01
US4759331A (en) 1988-07-26
JPS62107267A (en) 1987-05-18
DE3539057A1 (en) 1987-05-14
BR8605409A (en) 1987-08-11
EP0222131A3 (en) 1987-11-11
ATE49033T1 (en) 1990-01-15
EP0222131A2 (en) 1987-05-20

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