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EP1309791B1 - Fuel injection valve - Google Patents

Fuel injection valve Download PDF

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Publication number
EP1309791B1
EP1309791B1 EP01960142A EP01960142A EP1309791B1 EP 1309791 B1 EP1309791 B1 EP 1309791B1 EP 01960142 A EP01960142 A EP 01960142A EP 01960142 A EP01960142 A EP 01960142A EP 1309791 B1 EP1309791 B1 EP 1309791B1
Authority
EP
European Patent Office
Prior art keywords
armature
fuel injection
injection valve
valve
return spring
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP01960142A
Other languages
German (de)
French (fr)
Other versions
EP1309791A1 (en
Inventor
Thomas Sebastian
Matthias Boee
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1309791A1 publication Critical patent/EP1309791A1/en
Application granted granted Critical
Publication of EP1309791B1 publication Critical patent/EP1309791B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F02M51/0635—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding
    • F02M51/066—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not 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
    • 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
    • F02M51/0635—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding
    • F02M51/0642—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding the armature having a valve attached thereto
    • F02M51/0653—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding the armature having a valve attached thereto the valve being an elongated body, e.g. a needle valve
    • 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
    • F02M51/0635—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding
    • F02M51/0642—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding the armature having a valve attached thereto
    • F02M51/0653—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding the armature having a valve attached thereto the valve being an elongated body, e.g. a needle valve
    • F02M51/0657—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding the armature having a valve attached thereto the valve being an elongated body, e.g. a needle valve the body being hollow and its interior communicating with the fuel flow

Definitions

  • the invention relates to a fuel injection valve according to the preamble of the main claim.
  • an electromagnetically operable fuel injection valve in which for the electromagnetic actuation an armature cooperates with an electrically energizable magnetic coil and the stroke of the armature is transmitted via a valve needle to a valve closing body.
  • the valve closing body cooperates with a valve seat surface to form a sealing seat.
  • several fuel channels are provided in the anchor several fuel channels are provided. The return of the anchor is done with a return spring.
  • an electromagnetically operable fuel injection valve in which also an armature cooperates with an electrically energizable magnetic coil. The stroke of the armature is transmitted via a valve needle to a valve closing body.
  • a disadvantage of the fuel injection valves known from the above publications is in particular the lack of free flow space for the fuel, which is through the arrangement of the valve needle is conditioned in a recess of the armature.
  • a disadvantage of the fuel injection valves known from the above publications is in particular the lack of free flow space for the fuel, which is through the arrangement of the valve needle is conditioned in a recess of the armature.
  • large pressure differences occur between the armature upper side and the armature underside, since the pressure compensation is hindered.
  • the diameter of holes which are mounted in the armature to allow the fuel to pass through is limited due to the necessary armature pole area and the small amount of space available.
  • a fuel injection valve which has a magnet coil, an armature acted upon in a closing direction by a return spring and a valve needle which is non-positively connected to the armature for actuation of a valve closing body which forms a sealing seat together with a valve seat surface.
  • the anchor has a cup-shaped axial extension as a guide tube with a bottom part, in which at least one opening is formed.
  • the extension as a guide tube is made in one piece with the anchor.
  • the guide tube itself forms a bottom part, which is penetrated in an opening of the valve needle.
  • a return spring for the valve needle is arranged in an inner recess of the guide tube, which is supported on the one hand on the valve needle and on the other hand on an additional attached to an adjusting support flange.
  • the complex construction becomes even more complicated and difficult to assemble by a second return spring for the armature, which is supported on the one hand on a shoulder of the adjusting sleeve and on the other hand on a further additional Abstutzflansch, which in turn must be placed on a shoulder in the anchor.
  • the fuel injection valve according to the invention with the characterizing features of the main claim has the advantage that the fuel can flow through the anchor unhindered by a large anchor hole and the openings which are mounted in a pot-shaped extension of the armature.
  • the anchor hole has the same diameter as an inner longitudinal opening of the inner pole of the magnetic coil.
  • the pressure difference between the upper side of the armature and the lower side can thereby be reduced to an arbitrarily small value. Due to the larger anchor hole, the effective anchor area can be reduced and thus the residual pressure acting on the anchor can be reduced. This leads to shorter valve opening times and to a reduction of the dispersion in the switching times due to fluctuations in the pressure difference.
  • the corresponding components for implementing this principle are all arranged in the outflow direction after the armature, whereby the flow through the armature is not hindered.
  • a hollow cylindrical valve needle which is arranged axially displaceable in the extension of the armature and is traversed by fuel.
  • the pot-shaped extension of the armature can be formed integrally with this or consist of two separate components.
  • the extension preferably has at least two openings, which accommodates a uniform flow through the extension. However, there are also several or only one opening possible. The openings are accordingly separated from each other by an equal number of Kreissegementen of the hollow cylindrical extension.
  • FIG. 1 shows a sectional, highly schematic sectional view of a longitudinal section through an example of a fuel injection valve 1.
  • the fuel injection valve 1 has a magnetic coil 2 which cooperates with an armature 3.
  • the magnet coil 2 cooperates with an inner pole 4 and an outer pole 5.
  • the outer pole 5 continues downstream in a valve housing 6.
  • the armature 3 has an extension 7, which is formed as a hollow cylinder and is arranged on a downstream side 34 of the armature 3.
  • the extension 7 has a bottom part 24 which terminates the extension 7 downstream.
  • a return spring 9 is arranged in an inner recess 8, which is formed in the armature 3 and the extension 7, .
  • the return spring 9 is brought by an inserted into the inner pole 4 adjustment sleeve 10 in a recess 11 of the inner pole 4 on bias.
  • valve needle 13 is supported.
  • the valve needle 13 is preferably welded to the bottom part 24 of the extension 7.
  • the valve needle 13 has at a downstream end 37 a valve closing body 14 which cooperates with a formed on a valve seat body 15 valve seat surface 16 to a sealing seat.
  • a discharge opening 17 is formed in the valve seat body 15 .
  • the fuel is supplied via a central fuel supply 18, flows through the recess 11 of the inner pole 4 and through the recess 8 of the extension 7 and exits from the extension 7 through openings 20, which are further identified in FIG. 1B. Thereafter, the fuel flows through the valve housing 6 to the sealing seat.
  • the valve closing body 14 In the idle state of the fuel injection valve 1, the valve closing body 14 is held by the bias of the return spring 9 in sealing engagement with the valve seat surface 16. The fuel injection valve 1 is thus closed. If the magnetic coil 2 is supplied with an exciting current, the armature 3 is pulled against the force of the return spring 9 after sufficient buildup of the magnetic field in the direction of the inner pole 4. After passing through an anchor stroke predetermined by the size of a working gap 19, the armature 3 with an inlet-side armature end face 21 strikes against an armature stop 22 formed on the inner pole 4. Fuel flows from the central fuel supply 18 through the recesses 11 and 8 and the openings 20 in the direction of sealing seat.
  • the armature 3 drops after sufficient degradation of the magnetic field by the force of the return spring 9 from the inner pole 4, whereby the valve needle 13 moves in the outflow direction, the valve closing body 14 on the valve seat surface sixteenth touches down and the fuel injection valve 1 is closed.
  • FIG. 1B shows, in an excerpted schematic sectional view, a section through the extension 7 along the line IB-IB in FIG. 1A.
  • the extension 7 is hollow cylindrical in its basic form and consists of several segments 23, preferably at least two, between which there is a corresponding number of openings 20 in the circumferential direction.
  • the segments 23 forming a jacket part of the extension 7 are preferably formed integrally with the bottom part 24 of the extension 7.
  • the return spring 9 is supported on the bottom part 24, the return spring 9 is supported.
  • the valve needle 13 is supported, as described in more detail with reference to FIG. 1A.
  • the fuel which flows in centrally, flows out of the extension 7 through the recess 8 of the extension 7 and through the openings 20.
  • the size of the recess 8 and the openings 20 between the segments 23 ensures that the fuel can flow through the fuel injector 1 without significantly damaging the armature 3.
  • the fuel injection valve 1 can be operated particularly advantageous if the so-called Vorhubhan is used.
  • the armature 3 is first pre-accelerated and undergoes a partial stroke, during which the valve needle 13 is not yet taken. Only after reaching a first anchor stop the valve needle is taken over suitable devices against the force of a second return spring.
  • the magnetic circuit is unaffected by the partial stroke.
  • the diameter of the inner pole. 4 be selected smaller, whereby the effective magnetic pole surface and thus the acting magnetic force can be increased.
  • FIG. 2 shows an example of the fuel injection valve 1 in a partially enlarged sectional view as compared to FIG. 1A.
  • the extension 7 of the armature 3 in the bottom part 24 has a recess 25 which is penetrated by the valve needle 13.
  • the valve needle 13 At its inlet-side end 36, the valve needle 13 has a flange 26 which has a protruding collar 27.
  • the valve needle 13 is preferably welded to the flange 26, but may also be made in one piece with this.
  • the first return spring 9 On the collar 27 of the flange 26, the first return spring 9 is supported. Between the collar 27 and the bottom part 24, a second return spring 28 is clamped.
  • the spring constant of the second return spring 28 is considerably smaller than the spring constant of the first return spring 9, to allow movement of the armature 3 without the valve needle 13.
  • the first return spring 9 presses the valve needle 13 via the collar 27 of the flange 26 to the sealing seat.
  • the armature 3 lies on an armature support 29, which is annular in the valve housing 6 is formed. 2 is energized, the armature 3 moves in the direction of the inner pole 4. At this time, the armature 3 must move only against the force of the second return spring 28, since the spring constant of the second Return spring 28 is so small that the armature 3 is not significantly inhibited in its movement, the valve needle 13, however, still remains at rest.
  • the armature 3 strikes against the armature stop 22 of the inner pole 4 with its inlet-side armature end face 21.
  • the solenoid coil 2 is energized, the fuel injection valve 1 remains in the open position. If the coil current is switched off, the armature 3 drops from the inner pole 4 by the force of the first return spring 9 together with the flange 26 and the valve needle 13 which is non-positively connected with the flange 26. The closing movement takes place in a train over the total stroke, whereby the fuel injection valve 1 can be closed quickly.
  • Fig. 3 shows an excerpt, schematic sectional view of an embodiment of the fuel injection valve 1 according to the invention in connection with the Vorhubtex.
  • valve needle 13 is designed in the present embodiment as a hollow cylinder and thereby assumes the function of only rudimentary trained extension 7.
  • the valve needle 13 has transverse outflow openings 31.
  • the extension 7 of the armature 3 is formed in the present embodiment without bottom part 24, but instead is welded to a sleeve 32 which is penetrated by the valve needle 13.
  • the valve needle 13 has at its inlet end a collar 33, which is pressed by the second return spring 28 which is clamped between the sleeve 32 and the collar 33 against the abströmmatitige anchor end face 34.
  • the first return spring 9 is guided, which is supported on the inlet-side end 36 of the valve needle 13.
  • the sum of the cross-sectional areas of the transverse outflow openings 31 of the valve needle 13 should be greater than or at least equal to the cross-sectional area of the recess 8 of the armature 3.
  • the armature 3 When the magnetic coil 2 is energized, the armature 3, as in the example of FIG. 2, first passes through a preliminary stroke which corresponds to a height of the preliminary stroke gap 30 between the sleeve 32 and the collar 33 of the valve needle 13. Once the sleeve 32 abuts the collar 33, the armature 3 takes against the force of the first return spring 9, the valve needle 13 with. After passing through the Vorhubs or closing the working gap 19 between the inlet-side anchor end face 21 and the anchor stop 22 of the inner pole 4, the armature 3 strikes the inner pole 4. As long as the solenoid coil 2 is energized, the fuel injection valve 1 remains in the open position.
  • the armature 3 drops off the inner pole 4 after sufficient removal of the magnetic field by the force of the first return spring 9, and the fuel injection valve 1 is closed.
  • An inner recess 35 of the valve needle 13 is slightly smaller in diameter than the recess 11 of the inner pole 4 and the recess 8 of the armature 3 formed-This can form a slight back pressure on the collar 33, the operation of the fuel injector, 1 by a slight contribution to the closing force.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)

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.

Aus der DE 196 26 576 A1 ist bereits ein elektromagnetisch betätigbares Brennstoffeinspritzventil bekannt, bei welchem zur elektromagnetischen Betätigung ein Anker mit einer elektrisch erregbaren Magnetspule zusammenwirkt und der Hub des Ankers über eine Ventilnadel auf einen Ventilschließkörper übertragen wird. Der Ventilschließkörper wirkt mit einer Ventilsitzfläche zu einem Dichtsitz zusammen. Im Anker sind mehrere Brennstoffkanäle vorgesehen. Die Rückstellung des Ankers erfolgt mit einer Rückstellfeder.From DE 196 26 576 A1, an electromagnetically operable fuel injection valve is already known, in which for the electromagnetic actuation an armature cooperates with an electrically energizable magnetic coil and the stroke of the armature is transmitted via a valve needle to a valve closing body. The valve closing body cooperates with a valve seat surface to form a sealing seat. In the anchor several fuel channels are provided. The return of the anchor is done with a return spring.

Auch aus der DE 195 03 821 A1 ist ein elektromagnetisch betätigbares Brennstoffeinspritzventil bekannt, bei welchem ebenfalls ein Anker mit einer elektrisch erregbaren Magnetspule zusammenwirkt. Der Hub des Ankers wird über eine ventilnadel auf einen Ventilschließkörper übertragen.Also known from DE 195 03 821 A1, an electromagnetically operable fuel injection valve is known, in which also an armature cooperates with an electrically energizable magnetic coil. The stroke of the armature is transmitted via a valve needle to a valve closing body.

Nachteilig an den aus den obengenannten Druckschriften bekannten Brennstoffeinspritzventilen ist insbesondere der mangelnde freie Strömungsraum für den Brennstoff, was durch die Anordnung der Ventilnadel in einer Ausnehmung des Ankers bedingt ist. Dadurch kommt es, insbesondere während der Bewegung des Ankers, zu großen Druckdifferenzen zwischen der Ankerober- und der Ankerunterseite, da der Druckausgleich behindert wird. Der Durchmesser von Bohrungen, welche im Anker angebracht sind, um dem Brennstoff den Durchtritt zu ermöglichen, ist aufgrund der notwendigen Ankerpolfläche und des geringen räumlichen Platzangebots begrenzt.A disadvantage of the fuel injection valves known from the above publications is in particular the lack of free flow space for the fuel, which is through the arrangement of the valve needle is conditioned in a recess of the armature. As a result, in particular during the movement of the armature, large pressure differences occur between the armature upper side and the armature underside, since the pressure compensation is hindered. The diameter of holes which are mounted in the armature to allow the fuel to pass through is limited due to the necessary armature pole area and the small amount of space available.

Nachteilig ist ferner, daß die hydraulische Druckkraft durch den Brennstoff auf den Anker insbesondere zu größeren ventilöffnungszeiten führt, was sich entsprechend auf die zugemessene Brennstoffmenge auswirkt. Andererseits werden durch Schwankungen in der Druckdifferenz, beispielsweise bei unterschiedlichen Temperaturen des Brennstoffeinspritzventils und dadurch resultierenden Viskositätsunterschieden, Streuungen in den Schaltzeiten des Brennstoffeinspritzventils verursacht, welche zusätzlich zu den verlängerten Schaltzeiten zur Zumessung ungleichmäßig großer Brennstoffmengen führen.Another disadvantage is that the hydraulic pressure force leads to the armature in particular to larger valve opening times, which has a corresponding effect on the metered amount of fuel. On the other hand, fluctuations in the pressure difference, for example, at different temperatures of the fuel injection valve and thereby resulting viscosity differences, caused variations in the switching times of the fuel injection valve, which in addition to the extended switching times lead to the metering unevenly large amounts of fuel.

Aus der US 4,984,549 A ist bereits ein Brennstoffeinspritzventil bekannt, das eine Magnetspule, einen in einer Schließrichtung von einer Rückstellfeder beaufschlagten Anker und eine mit dem Anker kraftschlüssig in Verbindung stehenden Ventilnadel zur Betätigung eines Ventilschließkötpers, der zusammen mit einer Ventilsitzfläche einen Dichtsitz bildet, aufweist. Der Anker weist dabei einen topfförmigen axialen Fortsatz als Führungsrohr mit einem Bodenteil auf, in welchem mindestens eine Öffnung ausgebildet ist. Der Fortsatz als Führungsrohr ist einteilig mit dem Anker ausgeführt. Das Führungsrohr bildet selbst ein Bodenteil, das in einer Öffnung von der Ventilnadel durchgriffen wird. Eine Rückstellfeder für die Ventilnadel ist in einer inneren Ausnehmung des Führungsrohres angeordnet, die sich einerseits an der Ventilnadel und andererseits an einem zusätzlich an einer Einstellhülse angebrachten Abstützflansch abstützt. Die komplexe Konstruktion wird noch komplizierter und schwieriger in der Montage durch eine zweite Rückstellfeder für den Anker, die sich einerseits an einer Schulter der Einstellhülse und andererseits an einem weiteren zusätzlichen Abstutzflansch, der wiederum an eine Schulter in dem Anker eingelegt werden muss, abstützt.From US Pat. No. 4,984,549 A, a fuel injection valve is already known which has a magnet coil, an armature acted upon in a closing direction by a return spring and a valve needle which is non-positively connected to the armature for actuation of a valve closing body which forms a sealing seat together with a valve seat surface. The anchor has a cup-shaped axial extension as a guide tube with a bottom part, in which at least one opening is formed. The extension as a guide tube is made in one piece with the anchor. The guide tube itself forms a bottom part, which is penetrated in an opening of the valve needle. A return spring for the valve needle is arranged in an inner recess of the guide tube, which is supported on the one hand on the valve needle and on the other hand on an additional attached to an adjusting support flange. The complex construction becomes even more complicated and difficult to assemble by a second return spring for the armature, which is supported on the one hand on a shoulder of the adjusting sleeve and on the other hand on a further additional Abstutzflansch, which in turn must be placed on a shoulder in the anchor.

Vorteile der ErfindungAdvantages of the invention

Das erfindungsgemäße Erennstoffeinspritzventil mit den kennzeichnenden Merkmalen des Hauptanspruchs hat demgegenüber den Vorteil, daß durch eine große Ankerbohrung sowie die Öffnungen, welche in einem topfförmigen Fortsatz des Ankers angebracht sind, der Brennstoff ungehindert den Anker durchströmen kann. Idealerweise weist die Ankerbohrung den gleichen Durchmesser auf wie eine innere Längsöffnung des Innenpols der Magnetspule. Die Druckdifferenz zwischen Ankeroberseite und -unterseite ist dadurch auf einen beliebig kleinen Wert verkleinerbar. Durch die größere Ankerbohrung kann zudem die wirksame Ankerfläche verkleinert und damit die restliche auf den Anker wirkende Druckkraft reduziert werden. Dies führt zu kürzeren Ventilöffnungszeiten und zu einer Reduzierung der Streuung in den Schaltzeiten durch Schwankungen in der Druckdifferenz.The fuel injection valve according to the invention with the characterizing features of the main claim has the advantage that the fuel can flow through the anchor unhindered by a large anchor hole and the openings which are mounted in a pot-shaped extension of the armature. Ideally, the anchor hole has the same diameter as an inner longitudinal opening of the inner pole of the magnetic coil. The pressure difference between the upper side of the armature and the lower side can thereby be reduced to an arbitrarily small value. Due to the larger anchor hole, the effective anchor area can be reduced and thus the residual pressure acting on the anchor can be reduced. This leads to shorter valve opening times and to a reduction of the dispersion in the switching times due to fluctuations in the pressure difference.

Von Vorteil ist insbesondere die Verbindung der erfindungsgemäßen Maßnahmen mit dem sogenannten Vorhubprinzip, welches ebenfalls verkürzte Öffnungszeiten ermöglicht.Of particular advantage is the connection of the measures according to the invention with the so-called Vorhubprinzip, which also allows shorter opening times.

Vorteilhafterweise sind die zur Umsetzung dieses Prinzips entsprechenden Bauteile sämtlich in Abströmrichtung nach dem Anker angeordnet, wodurch die Durchströmung des Ankers nicht behindert wird.Advantageously, the corresponding components for implementing this principle are all arranged in the outflow direction after the armature, whereby the flow through the armature is not hindered.

Besonders vorteilhaft ist die Verwendung einer hohlzylindrischen Ventilnadel, welche axial verschiebbar in dem Fortsatz des Ankers angeordnet ist und von Brennstoff durchströmt wird.Particularly advantageous is the use of a hollow cylindrical valve needle, which is arranged axially displaceable in the extension of the armature and is traversed by fuel.

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

Der topfförmige Fortsatz des Ankers kann mit diesem einstückig ausgebildet sein oder aus zwei getrennten Bauteilen bestehen.The pot-shaped extension of the armature can be formed integrally with this or consist of two separate components.

Der Fortsatz weist vorzugsweise mindestens zwei Öffnungen auf, was einer gleichmäßigen Durchströmung des Fortsatzes entgegenkommt. Es sind jedoch auch mehrere oder nur eine Öffnung möglich. Die Öffnungen sind dementsprechend durch eine gleich große Anzahl von Kreissegementen des hohlzylindrisch ausgeführten Fortsatzes voneinander getrennt.The extension preferably has at least two openings, which accommodates a uniform flow through the extension. However, there are also several or only one opening possible. The openings are accordingly separated from each other by an equal number of Kreissegementen of the hollow cylindrical extension.

Zeichnungdrawing

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung vereinfacht dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen:

Fig. 1A
einen schematischen Schnitt durch ein Beispiel eines Brennstoffeinspritzventils,
Fig. 1B
einen Schnitt entlang der Linie IB-IB in Fig. 1,
Fig. 2
einen schematischen Schnitt durch ein Beispiel eines Brennstoffeinspritzventils, und
Fig. 3
einen schematischen Schnitt durch ein Ausführungsbeispiel des erfindungsgemäßen Brennstoffeinspritzventils.
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. 1A
a schematic section through an example of a fuel injection valve,
Fig. 1B
a section along the line IB-IB in Fig. 1,
Fig. 2
a schematic section through an example of a fuel injection valve, and
Fig. 3
a schematic section through an embodiment of the fuel injection valve according to the invention.

Beschreibung der AusführungsbeispieleDescription of the embodiments

Fig. 1 zeigt in einer ausschnittsweisen, stark schematisierten Schnittdarstellung einen Längsschnitt durch ein Beispiel eines Brennstoffeinspritzventils 1.1 shows a sectional, highly schematic sectional view of a longitudinal section through an example of a fuel injection valve 1.

Das Brennstoffeinspritzventil 1 weist eine Magnetspule 2 auf, welche mit einem Anker 3 zusammenwirkt. Die Magnetspule 2 wirkt mit einem Innenpol 4 und einem Außenpol 5 zusammen. Der Außenpol 5 setzt sich abströmseitig in einem Ventilgehäuse 6 fort.The fuel injection valve 1 has a magnetic coil 2 which cooperates with an armature 3. The magnet coil 2 cooperates with an inner pole 4 and an outer pole 5. The outer pole 5 continues downstream in a valve housing 6.

Der Anker 3 weist einen Fortsatz 7 auf, welcher hohlzylindrisch ausgebildet ist und an einer abströmseitigen Seite 34 des Ankers 3 angeordnet ist. Der Fortsatz 7 weist ein Bodenteil 24 auf, der den Fortsatz 7 abströmseitig abschließt. In einer inneren Ausnehmung 8, welche in dem Anker 3 und dem Fortsatz 7 ausgebildet ist, ist eine Rückstellfeder 9 angeordnet. Die Rückstellfeder 9 wird durch eine in den Innenpol 4 eingeschobene Einstellhülse 10 in einer Ausnehmung 11 des Innenpols 4 auf vorspannung gebracht.The armature 3 has an extension 7, which is formed as a hollow cylinder and is arranged on a downstream side 34 of the armature 3. The extension 7 has a bottom part 24 which terminates the extension 7 downstream. In an inner recess 8, which is formed in the armature 3 and the extension 7, a return spring 9 is arranged. The return spring 9 is brought by an inserted into the inner pole 4 adjustment sleeve 10 in a recess 11 of the inner pole 4 on bias.

An einem abströmseitigen Ende 12 des Fortsatzes 7 stützt sich eine Ventilnadel 13 ab. Die Ventilnadel 13 ist mit dem Bodenteil 24 des Fortsatzes 7 vorzugsweise verschweißt. Die Ventilnadel 13 weist an einem abströmseitigen Ende 37 einen Ventilschließkörper 14 auf, der mit einer an einem Ventilsitzkörper 15 ausgebildeten Ventilsitzfläche 16 zu einem Dichtsitz zusammenwirkt.At a downstream end 12 of the extension 7, a valve needle 13 is supported. The valve needle 13 is preferably welded to the bottom part 24 of the extension 7. The valve needle 13 has at a downstream end 37 a valve closing body 14 which cooperates with a formed on a valve seat body 15 valve seat surface 16 to a sealing seat.

Bei dem in Fig. 1A dargestellten Brennstoffeinspritzventil 1 handelt es sich um ein nach innen öffnendes Brennstoffeinspritzventil 1. In dem Ventilsitzkörper 15 ist eine Abspritzöffnung 17 ausgebildet. Der Brennstoff wird über eine zentrale Brennstoffzufuhr 18 zugeleitet, strömt durch die Ausnehmung 11 des Innenpols 4 sowie durch die Ausnehmung 8 des Fortsatzes 7 und tritt durch Öffnungen 20, welche in Fig. 1B näher gekennzeichnet sind, aus dem Fortsatz 7 aus. Danach strömt der Brennstoff durch das Ventilgehäuse 6 zum Dichtsitz.In the fuel injection valve 1 shown in Fig. 1A is an inwardly opening fuel injection valve 1. In the valve seat body 15 is a discharge opening 17 is formed. The fuel is supplied via a central fuel supply 18, flows through the recess 11 of the inner pole 4 and through the recess 8 of the extension 7 and exits from the extension 7 through openings 20, which are further identified in FIG. 1B. Thereafter, the fuel flows through the valve housing 6 to the sealing seat.

Im Ruhezustand des Brennstoffeinspritzventils 1 wird der Ventilschließkörper 14 durch die Vorspannung der Rückstellfeder 9 in dichtender Anlage an der ventilsitzfläche 16 gehalten. Das Brennstoffeinspritzventil 1 ist somit geschlossen. Wird der Magnetspule 2 ein Erregerstrom zugeführt, wird der Anker 3 entgegen der Kraft der Rückstellfeder 9 nach genügendem Aufbau des Magnetfeldes in Richtung Innenpol 4 gezogen. Nach Durchlaufen eines durch die Größe eines Arbeitsspalts 19 vorgegebenen Ankerhubs schlägt der Anker 3 mit einer zulaufseitigen Ankerstirnseite 21 an einen am Innenpol 4 ausgebildeten Ankeranschlag 22 an. Brennstoff strömt von der zentralen Brennstoffzufuhr 18 durch die Ausnehmungen 11 und 8 sowie die Öffnungen 20 in Richtung Dichtsitz.In the idle state of the fuel injection valve 1, the valve closing body 14 is held by the bias of the return spring 9 in sealing engagement with the valve seat surface 16. The fuel injection valve 1 is thus closed. If the magnetic coil 2 is supplied with an exciting current, the armature 3 is pulled against the force of the return spring 9 after sufficient buildup of the magnetic field in the direction of the inner pole 4. After passing through an anchor stroke predetermined by the size of a working gap 19, the armature 3 with an inlet-side armature end face 21 strikes against an armature stop 22 formed on the inner pole 4. Fuel flows from the central fuel supply 18 through the recesses 11 and 8 and the openings 20 in the direction of sealing seat.

Wird der die Magnetspule 2 erregende Strom abgeschaltet, fällt nach genügendem Abbau des Magnetfeldes der Anker 3 durch die Kraft der Rückstellfeder 9 vom Innenpol 4 ab, wodurch sich die Ventilnadel 13 in Abströmrichtung bewegt, der Ventilschließkörper 14 auf der Ventilsitzfläche 16 aufsetzt und das Brennstoffeinspritzventil 1 geschlossen wird.If the current exciting the magnetic coil 2 is turned off, the armature 3 drops after sufficient degradation of the magnetic field by the force of the return spring 9 from the inner pole 4, whereby the valve needle 13 moves in the outflow direction, the valve closing body 14 on the valve seat surface sixteenth touches down and the fuel injection valve 1 is closed.

Fig. 1B zeigt in einer auszugsweisen schematisierten Schnittdarstellung einen Schnitt durch den Fortsatz 7 entlang der Linie IB-IB in Fig. 1A.FIG. 1B shows, in an excerpted schematic sectional view, a section through the extension 7 along the line IB-IB in FIG. 1A.

Der Fortsatz 7 ist in seiner Grundform hohlzylindrisch ausgeführt und besteht aus mehreren Segmenten 23, vorzugsweise mindestens zwei, zwischen denen sich in Umfangsrichtung eine entsprechende Anzahl von Öffnungen 20 befindet. Die ein Mantelteil des Fortsatzes7 bildenden Segmente 23 sind vorzugsweise einstückig mit dem Bodenteil 24 des Fortsatzes 7 ausgebildet. Auf dem Bodenteil 24 stützt sich die Rückstellfeder 9 ab. An der der Rückstellfeder 9 gegenüberliegenden Seite des Bodenteils 24 stützt sich die Ventilnadel 13 ab, wie anhand von Fig. 1A näher beschrieben. Der Brennstoff, welcher zentral zufließt, strömt durch die Ausnehmung 8 des Fortsatzes 7 und durch die Öffnungen 20 aus dem Fortsatz 7 heraus. Durch die Größe der Ausnehmung 8 sowie der Öffnungen 20 zwischen den Segmenten 23 wird sichergestellt, daß der Brennstoff das Brennstoffeinspritzventil 1 durchfließen kann, ohne sich signifikant an dem Anker 3 zu stauen.The extension 7 is hollow cylindrical in its basic form and consists of several segments 23, preferably at least two, between which there is a corresponding number of openings 20 in the circumferential direction. The segments 23 forming a jacket part of the extension 7 are preferably formed integrally with the bottom part 24 of the extension 7. On the bottom part 24, the return spring 9 is supported. At the return spring 9 opposite side of the bottom part 24, the valve needle 13 is supported, as described in more detail with reference to FIG. 1A. The fuel, which flows in centrally, flows out of the extension 7 through the recess 8 of the extension 7 and through the openings 20. The size of the recess 8 and the openings 20 between the segments 23 ensures that the fuel can flow through the fuel injector 1 without significantly damaging the armature 3.

Das Brennstoffeinspritzventil 1 läßt sich besonders vorteilhaft betreiben, wenn das sogenannte Vorhubprinzip verwendet wird. Dabei wird der Anker 3 zunächst vorbeschleunigt und durchläuft einen Teilhub, während dessen die ventilnadel 13 noch nicht mitgenommen wird. Erst nach Erreichen eines ersten Ankeranschlags wird die Ventilnadel über geeignete Vorrichtungen gegen die Kraft einer zweiten Rückstellfeder mitgenommen.The fuel injection valve 1 can be operated particularly advantageous if the so-called Vorhubprinzip is used. In this case, the armature 3 is first pre-accelerated and undergoes a partial stroke, during which the valve needle 13 is not yet taken. Only after reaching a first anchor stop the valve needle is taken over suitable devices against the force of a second return spring.

Wird zusätzlich das Brennstoffeinapritzventil 1 so konstruiert, daß die den Teilhub ermöglichenden zusätzlichen Bauteile in Abströmrichtung nach dem Anker 3 angeordnet sind, bleibt der Magnetkreis durch den Teilhub unbeeinflußt. Dadurch kann unter anderem der Durchmesser des Innenpols 4 kleiner gewählt werden, wodurch die effektive magnetische Polfläche und somit die wirkende Magnetkraft vergrößert werden.In addition, if the Brennstoffeinapritzventil 1 is constructed so that the partial lift enabling additional components are arranged downstream of the armature 3, the magnetic circuit is unaffected by the partial stroke. As a result, inter alia, the diameter of the inner pole. 4 be selected smaller, whereby the effective magnetic pole surface and thus the acting magnetic force can be increased.

Anhand der Figur 3 wird ein Ausführungsbeispiel des erfindungsgemäßen Brennstoffeinspritzventils 1 in Verbindung mit dem Vorhubprinzip näher beschrieben. Übereinstimmende Bauteile sind in den Figuren 2 und 3 mit gegenüber Fig. 1A übereinstimmenden Bezugszeichen versehen.An embodiment of the fuel injection valve 1 according to the invention in connection with the Vorhubprinzip will be described in more detail with reference to FIG. Matching components are provided in Figures 2 and 3 with respect to FIG. 1A matching reference numerals.

Fig. 2 zeigt in einer gegenüber Fig. 1A etwas vergrößerten teilweisen Schnittdarstellung ein Beispiel des Brennstoffeinspritzventils 1.FIG. 2 shows an example of the fuel injection valve 1 in a partially enlarged sectional view as compared to FIG. 1A.

Um das Prinzip des vorhubs einsetzen zu können, weist der Fortsatz 7 des Ankers 3 im Bodenteil 24 eine Ausnehmung 25 auf, welche von der Ventilnadel 13 durchgriffen wird. An ihrem zulaufseitigen Ende 36 weist die Ventilnadel 13 einen Flansch 26 auf, der einen hervorkragenden Kragen 27 besitzt. Die Ventilnadel 13 ist mit dem Flansch 26 vorzugsweise verschweißt, kann aber auch mit diesem einstückig ausgeführt sein. Auf dem Kragen 27 des Flansches 26 stützt sich die erste Rückstellfeder 9 ab. Zwischen dem Kragen 27 und dem Bodenteil 24 ist eine zweite Rückstellfeder 28 eingespannt. Die Federkonstante der zweiten Rückstellfeder 28 ist dabei erheblich kleiner als die Federkonstante der ersten Rückstellfeder 9, um eine Bewegung des Ankers 3 ohne die Ventilnadel 13 zu ermöglichen.In order to use the principle of the pre-stroke, the extension 7 of the armature 3 in the bottom part 24 has a recess 25 which is penetrated by the valve needle 13. At its inlet-side end 36, the valve needle 13 has a flange 26 which has a protruding collar 27. The valve needle 13 is preferably welded to the flange 26, but may also be made in one piece with this. On the collar 27 of the flange 26, the first return spring 9 is supported. Between the collar 27 and the bottom part 24, a second return spring 28 is clamped. The spring constant of the second return spring 28 is considerably smaller than the spring constant of the first return spring 9, to allow movement of the armature 3 without the valve needle 13.

Im Ruhezustand des Brennstoffeinspritzventils 1 drückt die erste Rückstellfeder 9 die Ventilnadel 13 über den Kragen 27 des Flansches 26 auf den Dichtsitz. Der Anker 3 liegt dabei auf einer Ankerauflage 29, welche ringförmig im ventilgehäuse 6 ausgebildet ist. Wird die in Fig. 2 nicht näher dargestellte Magnetspule 2 bestromt, bewegt sich der Anker 3 in Richtung des Innenpols 4. Zu diesem Zeitpunkt muß sich der Anker 3 lediglich entgegen der Kraft der zweiten Rückstellfeder 28 bewegen, da die Federkonstante der zweiten Rückstellfeder 28 so gering ist, daß der Anker 3 in seiner Bewegung nicht wesentlich gehemmt wird, die Ventilnadel 13 jedoch noch in Ruhe bleibt. Nach Durchlaufen eines Vorhubs, welcher der Höhe eines Vorhubspalts 30 zwischen dem Bodenteil 24 des Fortsatzes 7 und dem Flansch 26 der Ventilnadel 13 entspricht, schlägt das Bodenteil 24 des Fortsatzes 7 am Flansch 26 an und der Anker 3 nimmt die Ventilnadel 13 über den Flansch 26 entgegen der Kraft der ersten Rückstellfeder 9 in Hubrichtung mit, wodurch das Brennstoffeinspritzventil 1 geöffnet wird.In the resting state of the fuel injection valve 1, the first return spring 9 presses the valve needle 13 via the collar 27 of the flange 26 to the sealing seat. The armature 3 lies on an armature support 29, which is annular in the valve housing 6 is formed. 2 is energized, the armature 3 moves in the direction of the inner pole 4. At this time, the armature 3 must move only against the force of the second return spring 28, since the spring constant of the second Return spring 28 is so small that the armature 3 is not significantly inhibited in its movement, the valve needle 13, however, still remains at rest. After passing through a Vorhubs, which corresponds to the height of a Vorhubspalts 30 between the bottom part 24 of the extension 7 and the flange 26 of the valve needle 13, the bottom part 24 of the extension 7 abuts the flange 26 and the armature 3 takes the valve needle 13 via the flange 26th against the force of the first return spring 9 in the stroke direction, whereby the fuel injection valve 1 is opened.

Sobald der Arbeitsspalt 19 geschlossen ist, schlägt der Anker 3 mit seiner zulaufseitigen Ankerstirnseite 21 am Ankeranschlag 22 des Innenpols 4 an. Solange die Magnetspule 2 bestromt wird, verbleibt das Brennstoffeinspritzventil 1 in der Offenstellung. Wird der Spulenstrom abgeschaltet, fällt der Anker 3 durch die Kraft der ersten Rückstellfeder 9 zusammen mit dem Flansch 26 und der mit dem Flansch 26 kraftschlüssig in Verbindung stehenden ventilnadel 13 vom Innenpol 4 ab. Die Schließbewegung erfolgt in einem Zug über den Gesamthub, wodurch das Brennstoffeinspritzventil 1 schnell geschlossen werden kann.As soon as the working gap 19 is closed, the armature 3 strikes against the armature stop 22 of the inner pole 4 with its inlet-side armature end face 21. As long as the solenoid coil 2 is energized, the fuel injection valve 1 remains in the open position. If the coil current is switched off, the armature 3 drops from the inner pole 4 by the force of the first return spring 9 together with the flange 26 and the valve needle 13 which is non-positively connected with the flange 26. The closing movement takes place in a train over the total stroke, whereby the fuel injection valve 1 can be closed quickly.

Fig. 3 zeigt in einer auszugsweisen, schematisierten Schnittdarstellung ein Ausführungsbeispiel des erfindungsgemäßen Brennstoffeinspritzventils 1 in Verbindung mit dem Vorhubprinzip.Fig. 3 shows an excerpt, schematic sectional view of an embodiment of the fuel injection valve 1 according to the invention in connection with the Vorhubprinzip.

Im Gegensatz zu dem in Fig. 2 dargestellten Beispiel ist die Ventilnadel 13 im vorliegenden Ausführungsbeispiel als Hohlzylinder gestaltet und übernimmt dadurch die Funktion des nurmehr rudimentär ausgebildeten Fortsatzes 7. Die Ventilnadel 13 weist quer verlaufende Ausströmöffnungen 31 auf. Der Fortsatz 7 des Ankers 3 ist im vorliegenden Ausführungsbeispiel ohne Bodenteil 24 ausgebildet, ist statt dessen jedoch mit einer Hülse 32 verschweißt, welche von der Ventilnadel 13 durchgriffen wird.In contrast to the example shown in FIG. 2, the valve needle 13 is designed in the present embodiment as a hollow cylinder and thereby assumes the function of only rudimentary trained extension 7. The valve needle 13 has transverse outflow openings 31. The extension 7 of the armature 3 is formed in the present embodiment without bottom part 24, but instead is welded to a sleeve 32 which is penetrated by the valve needle 13.

Die ventilnadel 13 weist an ihrem zulaufseitigen Ende einen Kragen 33 auf, welcher durch die zweite Rückstellfeder 28, welche zwischen der Hülse 32 und dem Kragen 33 eingespannt ist, gegen die abströmbeitige Ankerstirnfläche 34 gedrückt wird. In der Ausnehmung B des Ankers 3 ist die erste Rückstellfeder 9 geführt, welche sich auf dem zulaufseitigen Ende 36 der Ventilnadel 13 abstützt. Die Summe der Querschnittsflächen der quer verlaufenden Ausströmöffnungen 31 der Ventilnadel 13 sollte größer als oder wenigstens gleich der Querschnittsfläche der Ausnehmung 8 des Ankers 3 sein.The valve needle 13 has at its inlet end a collar 33, which is pressed by the second return spring 28 which is clamped between the sleeve 32 and the collar 33 against the abströmbeitige anchor end face 34. In the recess B of the armature 3, the first return spring 9 is guided, which is supported on the inlet-side end 36 of the valve needle 13. The sum of the cross-sectional areas of the transverse outflow openings 31 of the valve needle 13 should be greater than or at least equal to the cross-sectional area of the recess 8 of the armature 3.

Wird die Magnetspule 2 bestromt, durchläuft der Anker 3 wie im Beispiel der Fig. 2 zunächst einen Vorhub, welcher einer Höhe des Vorhubspalts 30 zwischen der Hülse 32 und dem Kragen 33 der Ventilnadel 13 entspricht. Sobald die Hülse 32 am Kragen 33 anschlägt, nimmt der Anker 3 entgegen der Kraft der ersten Rückstellfeder 9 die Ventilnadel 13 mit. Nach Durchlaufen des Vorhubs bzw. Schließen des Arbeitsspalts 19 zwischen der zulaufseitigen Ankerstirnseite 21 und dem Ankeranschlag 22 des Innenpols 4 schlägt der Anker 3 am Innenpol 4 an. Solange die Magnetspule 2 bestromt wird, verbleibt das Brennstoffeinspritzventil 1 in geöffneter Stellung.When the magnetic coil 2 is energized, the armature 3, as in the example of FIG. 2, first passes through a preliminary stroke which corresponds to a height of the preliminary stroke gap 30 between the sleeve 32 and the collar 33 of the valve needle 13. Once the sleeve 32 abuts the collar 33, the armature 3 takes against the force of the first return spring 9, the valve needle 13 with. After passing through the Vorhubs or closing the working gap 19 between the inlet-side anchor end face 21 and the anchor stop 22 of the inner pole 4, the armature 3 strikes the inner pole 4. As long as the solenoid coil 2 is energized, the fuel injection valve 1 remains in the open position.

Wird der die Magnetspule 2 erregende Strom abgeschaltet, fällt der Anker 3 nach genügendem Abbau des Magnetfeldes durch die Kraft der ersten Rückstellfeder 9 vom Innenpol 4 ab und das Brennstoffeinspritzventil 1 wird geschlossen.If the current that energizes the magnetic coil 2 is switched off, the armature 3 drops off the inner pole 4 after sufficient removal of the magnetic field by the force of the first return spring 9, and the fuel injection valve 1 is closed.

Eine innere Ausnehmung 35 der Ventilnadel 13 ist im Durchmesser geringfügig kleiner als die Ausnehmung 11 des Innenpols 4 bzw. die Ausnehmung 8 des Ankers 3 ausgebildet-Dadurch kann sich auf dem Kragen 33 ein geringfügiger Staudruck ausbilden, der die Funktionsweise des Hrennstoffeinspritzventils , 1 durch einen geringfügigen Beitrag zur Schließkraft unterstützt.An inner recess 35 of the valve needle 13 is slightly smaller in diameter than the recess 11 of the inner pole 4 and the recess 8 of the armature 3 formed-This can form a slight back pressure on the collar 33, the operation of the fuel injector, 1 by a slight contribution to the closing force.

Claims (6)

  1. Fuel injection valve (1), in particular fuel injection valve (1) for fuel injection systems of internal combustion engines, having a magnet coil (2), an armature (3) which is acted upon in a closing direction by a return spring (9), and a valve needle (13) which is connected in a non-positive manner to the armature (3) and actuates a valve closing body (14) which, together with a valve seat face (16), forms a sealing seat, the armature (3) having a pot-shaped axial projection (7) with a base part in which at least one opening is formed,
    characterized
    in that a sleeve (32) forms the base part, and the projection (7) is connected to the sleeve (32) in which the valve needle (13) is displaceably arranged, and the inlet-facing end (36) of the valve needle (13) has a collar (33) which is arranged between an outlet-facing armature end face (34) and the sleeve (32), and a second return spring (28) is arranged between the collar (33) of the valve needle (13) and the sleeve (32).
  2. Fuel injection valve according to Claim 1,
    characterized
    in that the armature (3) has an inner recess (8) in which the return spring (9) is inserted.
  3. Fuel injection valve according to Claim 1 or 2,
    characterized
    in that the return spring (9) rests on the collar (33).
  4. Fuel injection valve according to Claim 1,
    characterized
    in that the valve needle (13) is of hollow cylindrical form and has at least two outflow openings (31).
  5. Fuel injection valve according to Claims 1 to 4,
    characterized
    in that the armature (3) interacts with an inner pole (4) which belongs to the electromagnetic circuit, the inner pole (4) and the armature (3) each have an inner recess (11, 8) and the diameter of the recess (8) of the armature (3) corresponds to the diameter of the recess (11) of the inner pole (4).
  6. Fuel injection valve according to Claim 4,
    characterized
    in that the sum of the cross-sectional areas of the outflow openings (31) is greater than or at least equal to the cross-sectional area of the recess (8) of the armature (3).
EP01960142A 2000-08-10 2001-08-03 Fuel injection valve Expired - Lifetime EP1309791B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10039077 2000-08-10
DE10039077A DE10039077A1 (en) 2000-08-10 2000-08-10 Fuel injection valve esp. of IC engines with solenoid coil and armature and return spring also valve needle for operating valve closing body which together with valve seat surface forms sealed seat
PCT/DE2001/002961 WO2002012712A1 (en) 2000-08-10 2001-08-03 Fuel injection valve

Publications (2)

Publication Number Publication Date
EP1309791A1 EP1309791A1 (en) 2003-05-14
EP1309791B1 true EP1309791B1 (en) 2006-06-14

Family

ID=7651995

Family Applications (1)

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EP01960142A Expired - Lifetime EP1309791B1 (en) 2000-08-10 2001-08-03 Fuel injection valve

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US (1) US6857584B2 (en)
EP (1) EP1309791B1 (en)
JP (1) JP4838482B2 (en)
DE (2) DE10039077A1 (en)
WO (1) WO2002012712A1 (en)

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JP6264966B2 (en) * 2014-03-14 2018-01-24 株式会社デンソー Fuel injection device
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US20030102386A1 (en) 2003-06-05
DE50110166D1 (en) 2006-07-27
JP4838482B2 (en) 2011-12-14
DE10039077A1 (en) 2002-02-21
JP2004506130A (en) 2004-02-26
EP1309791A1 (en) 2003-05-14
WO2002012712A1 (en) 2002-02-14
US6857584B2 (en) 2005-02-22

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