EP1395746B1 - Fuel injection valve - Google Patents

Fuel injection valve Download PDF

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Publication number
EP1395746B1
EP1395746B1 EP02740335A EP02740335A EP1395746B1 EP 1395746 B1 EP1395746 B1 EP 1395746B1 EP 02740335 A EP02740335 A EP 02740335A EP 02740335 A EP02740335 A EP 02740335A EP 1395746 B1 EP1395746 B1 EP 1395746B1
Authority
EP
European Patent Office
Prior art keywords
armature
fuel injection
injection valve
valve according
abutment sleeve
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
EP02740335A
Other languages
German (de)
French (fr)
Other versions
EP1395746A1 (en
Inventor
Thomas Sebastian
Jens Pohlmann
Guido Pilgram
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
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Filing date
Publication date
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Publication of EP1395746A1 publication Critical patent/EP1395746A1/en
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Publication of EP1395746B1 publication Critical patent/EP1395746B1/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
    • F02M51/0664—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding
    • F02M51/0671—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding the armature having an elongated valve body attached thereto
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • 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
    • 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
    • F02M61/16—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
    • F02M2200/30—Fuel-injection apparatus having mechanical parts, the movement of which is damped
    • F02M2200/306—Fuel-injection apparatus having mechanical parts, the movement of which is damped using mechanical means
    • 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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/007—Venting means

Definitions

  • the invention relates to a fuel injection valve according to the preamble of the main claim.
  • An electromagnetically operable fuel injection valve is known from EP 0 683 862 B1, whose armature is characterized in that the armature stop surface facing the inner pole is slightly wedge-shaped to the hydraulic damping when opening the fuel injection valve and the hydraulic adhesion force after switching off the magnetic coil exciting current to minimize or completely eliminate. Further, by suitable measures such as vapor deposition and nitriding, the abutment surface of the armature designed wear-resistant, so that the stop surface during the entire life of the fuel injection valve has the same size and the operation of the Brennscherinspritzveptils is not affected.
  • a disadvantage of the fuel injection valve known from the above publication is in particular that although minimized and additionally hardened at the inner pole of the magnetic circuit surface of the armature, but that by the Aüsformung the armature stop surface turbulence and flows when displacing the fuel when tightening the armature occur, on the one hand affect the opening times of the fuel injection valve negative and on the other lead to damage to the armature and the anchor stop surface of the inner pole by hydrodynamic effects.
  • WO 0 025 018 A discloses an electromagnetically actuable fuel injection valve which has a one-piece armature.
  • the fuel injection valve according to the invention with the features of claim 1 has the advantage that the function of the anchor stop is taken over by an inserted into an outer anchor shell and connected thereto anchor anchor sleeve, so that the main energy of the anchor stop is received by the anchor stop sleeve and not by the anchor coat , The anchor jacket and the anchor stop surface of the inner pole are thus largely protected against damage.
  • the anchor stop sleeve in contrast to the anchor jacket is not made of soft magnetic and therefore only conditionally suitable for continuous running material, but for example, made of a durable hardened metal or a metal alloy or a metal-plastic compound.
  • anchor stop sleeve can be produced in a simple form by turning or deep drawing and can be connected by pressing or welding with the anchor jacket.
  • a drainage device comprising a drainage recess and a bore in the anchor stop sleeve provides Advantageously, for a correct permanent seat of the damping element, which is arranged downstream of the anchor stop sleeve.
  • a fuel injection valve 1 shown in FIG. 1 is in the form of a fuel injection valve 1 for fuel injection systems of mixture-compression spark-ignition internal combustion engines.
  • the fuel injection valve 1 is suitable in particular for the direct injection of fuel into a combustion chamber, not shown, of an internal combustion engine.
  • the fuel injection valve 1 consists of a nozzle body 2, in which a valve needle 3 is arranged.
  • the valve needle 3 is in operative connection with a valve closing body 4, which cooperates with a arranged on a valve seat body 5 valve seat surface 6 to a sealing seat.
  • the fuel injection valve 1 in the exemplary embodiment is an inwardly opening fuel injection valve 1, which has at least one injection opening 7.
  • the nozzle body 2 is sealed by a seal 8 against an outer pole 9 of a magnetic coil 10.
  • the magnetic coil 10 is encapsulated in a coil housing 11 and wound on a bobbin 12, which rests against an inner pole 13 of the magnetic coil 10.
  • the inner pole 13 and the outer pole 9 are separated from each other by a constriction 26 and connected to each other by a non-ferromagnetic connecting member 29.
  • the magnetic coil 10 is energized via a line 19 from a via an electrical plug contact 17 can be supplied with electric current.
  • the plug contact 17 is surrounded by a plastic casing 18, which may be molded on the inner pole 13.
  • valve needle 3 is guided in a valve needle guide 14, which is designed disk-shaped.
  • armature 20 On the other side of the dial 15 is an armature 20. This is connected via a flange 21 frictionally with the valve needle 3 in connection, which is connected by a weld 22 to the flange 21.
  • a return spring 23 On the flange 21, a return spring 23 is supported, which is brought in the present design of the fuel injection valve 1 by a sleeve 24 to bias.
  • the armature 20 of the fuel injection valve 1 is made in two parts.
  • An outer armature shell 34 is made of a soft magnetic material having the advantage of high magnetic flux.
  • soft magnetic materials have the disadvantage of poor resistance to mechanical wear, so that over time by the operation of the fuel injection valve 1 malfunctions can occur, for example, by changing the armature stroke. The life of a soft magnetic armature 20 is thus limited.
  • the armature 20 is provided with an anchor stop sleeve 35, which is arranged in a recess 37 of the anchor jacket 34.
  • the armature stop sleeve 35 thus takes over the function of the armature guide on the valve needle 3 and the implementation of the fuel on at least one legislativenanschliff 36 and the determination of the anchor stops on the first flange 21, the inlet side of the armature 20 is connected to the valve needle 3 via a weld 22 , and a second flange 31, which is arranged downstream of the armature 20 and also connected via a weld 33 with the valve needle 3.
  • a damping element 32 is additionally provided for damping valve needle bouncers. It may, as in the present embodiment, be designed as an O-ring 32, but also be designed in the form of a membrane.
  • FIGS. 2A to 2C A more detailed description and description of the measures according to the invention can be found in the description of FIGS. 2A to 2C.
  • valve needle guide 14 and the valve seat body 5 are fuel passages 30a and 30b.
  • the fuel is supplied via a central fuel supply 16 and filtered by a filter element 25.
  • the fuel injection valve 1 is sealed by a seal 28 against a fuel line, not shown.
  • the armature 20 In the idle state of the fuel injection valve 1, the armature 20 is acted upon by the return spring 23 counter to its stroke direction so that the valve closing body 4 is held on the valve seat 6 in sealing engagement. Upon energization of the solenoid 10, this builds up a magnetic field, which moves the armature 20 against the spring force of the return spring 23 in the stroke direction, wherein the stroke through a given in the rest position between the inner pole 12 and the armature 20 working gap 27 is specified.
  • the armature 20 takes the flange 21, which is welded to the valve needle 3, also in the stroke direction with.
  • the valve closing body 4 communicating with the valve needle 3 lifts off from the valve seat surface 6 and the fuel is sprayed off through the injection opening 7.
  • the armature 20 drops after sufficient degradation of the magnetic field by the pressure of the return spring 23 from the inner pole 13, whereby the standing with the valve needle 3 in connection flange 21 moves against the stroke direction.
  • the valve needle 3 is thereby moved in the same direction, whereby the valve closing body 4 touches on the valve seat surface 6 and the fuel injection valve 1 is closed.
  • FIG. 2A shows in an uncut illustration an overall view of the two-part armature 20 with the second flange 31 and the damping element 32 on the valve needle 3.
  • FIG. 2A illustrates the preassembled overall component, which is inserted into the housing 2 of the fuel injection valve 1.
  • first flange 21 is pushed and welded to the valve needle 3.
  • the two-part armature 20, which consists of the armature jacket 34 and the anchor stop sleeve 35 is also pushed onto the valve needle 3.
  • the formed in the embodiment as an O-ring damping element 32 is pushed either together with the second flange 32 or separately on the valve needle 3 and finally the second flange 32 at a predetermined distance corresponding to the desired stroke of the valve needle 3, also with the valve needle 3 welded.
  • the return spring 23 is supported on the first flange 21, not shown in FIG. 2A, which rests against the armature stop sleeve 35 which terminates flush with an inlet-side end face 38 of the anchor jacket 34.
  • An outflow-side end 39 of the armature stop sleeve 35 is supported on the prestressed damping element 32, which rests on the second flange 31.
  • FIG. 2B shows, in an excerpted sectional view, a section through the armature jacket 34 and the anchor stop sleeve 35.
  • three surface contours 36 are clearly recognizable, which take over the passage of the fuel through the armature 20.
  • separate holes in the armature jacket 34 which can affect the stability and symmetry of the soft-magnetic anchor jacket 34, can be avoided.
  • the foundednanschliffe 36 can be attached to this already in the manufacture of the anchor stop sleeve 35.
  • the anchor stop sleeve 35 is preferably inexpensive to produce by turning or by deep drawing.
  • FIG. 2C shows an excerpt from a section from FIG. 1 in the area IIC or a true-to-scale section through the overall component shown in FIG. 2A.
  • the anchor stop sleeve 35 is stepped in order to ensure the correct assembly of the anchor jacket 34 and the anchor stop sleeve 35.
  • a drainage recess 40 of the anchor stop sleeve 35 is shown with a bore 41, the fuel, which collects during operation of the fuel injection valve 1 by a pumping action in a recess 42 of the anchor stop sleeve 35 between this and the valve needle 3, in a Interior 42 of the fuel injection valve 1 dissipates. This can ensure that the damping element 32 remains in its position and is not displaced by the fuel pressure, which can lead to malfunction of the fuel injection valve 1.
  • the invention is not limited to the illustrated embodiments and z. B. for others.

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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.

Aus der EP 0 683 862 B1 ist ein elektromagnetisch betätigbares Brennstoffeinspritzventil bekannt, dessen Anker dadurch gekennzeichnet ist, daß die dem Innenpol zugewandte Ankeranschlagsfläche geringfügig keilförmig ausgebildet ist, um die hydraulische Dämpfung beim Öffnen des Brennstoffeinspritzventils und die hydraulische Adhäsionskraft nach Abschaltung des die Magnetspule erregenden Stromes zu minimieren oder ganz zu unterbinden. Ferner ist durch geeignete Maßnahmen wie Bedampfen und Nitrieren die Anschlagfläche des Ankers verschleißfest gestaltet, so daß die Anschlagfläche während der gesamten Lebensdauer des Brennstoffeinspritzventils die gleiche Größe aufweist und die Funktionsweise des Brennstoffeinspritzveptils nicht beeinträchtigt wird.An electromagnetically operable fuel injection valve is known from EP 0 683 862 B1, whose armature is characterized in that the armature stop surface facing the inner pole is slightly wedge-shaped to the hydraulic damping when opening the fuel injection valve and the hydraulic adhesion force after switching off the magnetic coil exciting current to minimize or completely eliminate. Further, by suitable measures such as vapor deposition and nitriding, the abutment surface of the armature designed wear-resistant, so that the stop surface during the entire life of the fuel injection valve has the same size and the operation of the Brennstoffeinspritzveptils is not affected.

Nachteilig bei dem aus der obengenannten Druckschrift bekannten Brennstoffeinspritzventil ist insbesondere, daß zwar die am Innenpol des Magnetkreises anschlagende Fläche des Ankers minimiert und zusätzlich gehärtet ist, daß jedoch durch die Aüsformung der Ankeranschlagsfläche Verwirbelungen und Strömungen beim Verdrängen des Brennstoffs beim Anziehen des Ankers auftreten, die zum einen die Öffnungszeiten des Brennstoffeinspritzventils negativ beeinflussen und zum anderen zu Beschädigungen des Ankers und der Ankeranschlagsfläche des Innenpols durch hydrodynamische Effekte führen.A disadvantage of the fuel injection valve known from the above publication is in particular that although minimized and additionally hardened at the inner pole of the magnetic circuit surface of the armature, but that by the Aüsformung the armature stop surface turbulence and flows when displacing the fuel when tightening the armature occur, on the one hand affect the opening times of the fuel injection valve negative and on the other lead to damage to the armature and the anchor stop surface of the inner pole by hydrodynamic effects.

Aus WO 0 025 018 A ist ein elektromagnetisch betätigbares Brennstoffeinspritzventil bekannt, das einen einteiligen Anker aufweist.WO 0 025 018 A discloses an electromagnetically actuable fuel injection valve which has a one-piece armature.

Vorteile der ErfindungAdvantages of the invention

Das erfindungsgemäße Brennstoffeinspritzventil mit den Merkmalen des Anspruchs 1 hat demgegenüber den Vorteil, daß die Funktion des Ankeranschlags durch eine in einen äußeren Ankermantel eingeschobene und mit diesem verbunden Ankeranschlaghülse übernommen wird, so daß die Hauptenergie des Ankeranschlags von der Ankeranschlaghülse und nicht durch den Ankermantel aufgenommen wird. Der Ankermantel und die Ankeranschlagsfläche des Innenpols sind somit weitgehend vor Beschädigungen geschützt.The fuel injection valve according to the invention with the features of claim 1 has the advantage that the function of the anchor stop is taken over by an inserted into an outer anchor shell and connected thereto anchor anchor sleeve, so that the main energy of the anchor stop is received by the anchor stop sleeve and not by the anchor coat , The anchor jacket and the anchor stop surface of the inner pole are thus largely protected against damage.

Durch die in den Ansprüchen 2 bis 14 aufgeführten Maßnahmen sind vorteilhafte Weiterentwicklungen des im Anspruch 1 angegebenen Brennstoffeinspritzventils möglich.The measures listed in claims 2 to 14 advantageous developments of the fuel injection valve specified in claim 1 are possible.

Von Vorteil ist dabei insbesondere, daß die Ankeranschlaghülse im Gegensatz zum Ankermantel nicht aus weichmagnetischem und daher nur bedingt dauerlaufgeeigneten Material besteht, sondern beispielsweise aus einem strapazierfähigen gehärteten Metall oder einer Metallegierung oder einer Metall-Kunststoff-Verbindung gefertigt ist.The advantage here is in particular that the anchor stop sleeve, in contrast to the anchor jacket is not made of soft magnetic and therefore only conditionally suitable for continuous running material, but for example, made of a durable hardened metal or a metal alloy or a metal-plastic compound.

Von Vorteil ist außerdem, daß die Ankeranschlaghülse in einfacher Form durch Drehen oder Tiefziehen herstellbar ist und durch Verpressen oder Verschweißen mit dem Ankermantel verbindbar ist.Another advantage is that the anchor stop sleeve can be produced in a simple form by turning or deep drawing and can be connected by pressing or welding with the anchor jacket.

Eine Drainagevorrichtung, die eine Drainageausnehmung und einer Bohrung in der Ankeranschlaghülse umfaßt, sorgt vorteilhafterweise für einen korrekten dauerhaften Sitz des Dämpfungselements, welches abströmseitig der Ankeranschlaghülse angeordnet ist.A drainage device comprising a drainage recess and a bore in the anchor stop sleeve provides Advantageously, for a correct permanent seat of the damping element, which is arranged downstream of the anchor stop sleeve.

Zeichnungdrawing

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

Fig. 1
einen schematischen Schnitt durch ein Ausführungsbeispiel eines erfindungsgemäßen Brennstoffeinspritzventils,
Fig. 2A
eine schematische Ansicht des Ankers des in Fig. 1 dargestellten ersten Ausführungsbeispiel des erfindungsgemäßen Brennstoffeinspritzventils im Bereich IIC in Fig. 1,
Fig. 2B
einen schematischen Querschnitt durch den Anker des erfindungsgemäßen Brennstoffeinspritzventils entlang der Linie IIB-IIB in Fig. 2A, und
Fig. 2C
einen schematischen Längsschnitt durch den Anker des erfindungsgemäßen Brennstoffeinspritzventils im Bereich IIC in Fig. 1.
An embodiment of the invention is shown in simplified form in the drawing and explained in more detail in the following description. Show it:
Fig. 1
a schematic section through an embodiment of a fuel injection valve according to the invention,
Fig. 2A
1 is a schematic view of the armature of the first exemplary embodiment of the fuel injection valve according to the invention shown in FIG. 1 in the region IIC in FIG. 1, FIG.
Fig. 2B
a schematic cross section through the armature of the fuel injection valve according to the invention along the line IIB-IIB in Fig. 2A, and
Fig. 2C
a schematic longitudinal section through the armature of the fuel injection valve according to the invention in the area IIC in Fig. 1st

Beschreibung des AusführungsbeispielsDescription of the embodiment

Ein in Fig. 1 dargestelltes Brennstoffeinspritzventil 1 ist in der Form eines Brennstoffeinspritzventils 1 für Brennstoffeinspritzanlagen von gemischverdichtenden, fremdgezündeten Brennkraftmaschinen ausgeführt. Das Brennstoffeinspritzventil 1 eignet sich insbesondere zum direkten Einspritzen von Brennstoff in einen nicht dargestellten Brennraum einer Brennkraftmaschine.A fuel injection valve 1 shown in FIG. 1 is in the form of a fuel injection valve 1 for fuel injection systems of mixture-compression spark-ignition internal combustion engines. The fuel injection valve 1 is suitable in particular for the direct injection of fuel into a combustion chamber, not shown, of an internal combustion engine.

Das Brennstoffeinspritzventil 1 besteht aus einem Düsenkörper 2, in welchem eine Ventilnadel 3 angeordnet ist.The fuel injection valve 1 consists of a nozzle body 2, in which a valve needle 3 is arranged.

Die Ventilnadel 3 steht in Wirkverbindung mit einem Ventilschließkörper 4, der mit einer auf einem Ventilsitzkörper 5 angeordneten Ventilsitzfläche 6 zu einem Dichtsitz zusammenwirkt. Bei dem Brennstoffeinspritzventil 1 handelt es sich im Ausführungsbeispiel um ein nach innen öffnendes Brennstoffeinspritzventil 1, welches über wenigstens eine Abspritzöffnung 7 verfügt. Der Düsenkörper 2 ist durch eine Dichtung 8 gegen einen Außenpol 9 einer Magnetspule 10 abgedichtet. Die Magnetspule 10 ist in einem Spulengehäuse 11 gekapselt und auf einen Spulenträger 12 gewickelt, welcher an einem Innenpol 13 der Magnetspule 10 anliegt. Der Innenpol 13 und der Außenpol 9 sind durch eine Verengung 26 voneinander getrennt und miteinander durch ein nicht ferromagnetisches Verbindungsbauteil 29 verbunden. Die Magnetspule 10 wird über eine Leitung 19 von einem über einen elektrischen Steckkontakt 17 zuführbaren elektrischen Strom erregt. Der Steckkontakt 17 ist von einer Kunststoffummantelung 18 umgeben, die am Innenpol 13 angespritzt sein kann.The valve needle 3 is in operative connection with a valve closing body 4, which cooperates with a arranged on a valve seat body 5 valve seat surface 6 to a sealing seat. The fuel injection valve 1 in the exemplary embodiment is an inwardly opening fuel injection valve 1, which has at least one injection opening 7. The nozzle body 2 is sealed by a seal 8 against an outer pole 9 of a magnetic coil 10. The magnetic coil 10 is encapsulated in a coil housing 11 and wound on a bobbin 12, which rests against an inner pole 13 of the magnetic coil 10. The inner pole 13 and the outer pole 9 are separated from each other by a constriction 26 and connected to each other by a non-ferromagnetic connecting member 29. The magnetic coil 10 is energized via a line 19 from a via an electrical plug contact 17 can be supplied with electric current. The plug contact 17 is surrounded by a plastic casing 18, which may be molded on the inner pole 13.

Die Ventilnadel 3 ist in einer Ventilnadelführung 14 geführt, welche scheibenförmig ausgeführt ist. Zur Hubeinstellung dient eine zugepaarte Einstellscheibe 15. An der anderen Seite der Einstellscheibe 15 befindet sich ein Anker 20. Dieser steht über einen Flansch 21 kraftschlüssig mit der Ventilnadel 3 in Verbindung, welche durch eine Schweißnaht 22 mit dem Flansch 21 verbunden ist. Auf dem Flansch 21 stützt sich eine Rückstellfeder 23 ab, welche in der vorliegenden Bauform des Brennstoffeinspritzventils 1 durch eine Hülse 24 auf Vorspannung gebracht wird.The valve needle 3 is guided in a valve needle guide 14, which is designed disk-shaped. On the other side of the dial 15 is an armature 20. This is connected via a flange 21 frictionally with the valve needle 3 in connection, which is connected by a weld 22 to the flange 21. On the flange 21, a return spring 23 is supported, which is brought in the present design of the fuel injection valve 1 by a sleeve 24 to bias.

Erfindungsgemäß ist der Anker 20 des Brennstoffeinspritzventils 1 zweiteilig ausgeführt. Ein äußerer Ankermantel 34 besteht aus einem weichmagnetischen Material, welches den Vorteil eines hohen magnetischen Flusses aufweist. Weichmagnetische Materialien weisen jedoch den Nachteil einer mangelhaften Beständigkeit gegenüber mechanischem Verschleiß auf, so daß mit der Zeit durch den Betrieb des Brennstoffeinspritzventils 1 Fehlfunktionen beispielsweise durch einen veränderten Ankerhub auftreten können. Die Lebensdauer eines weichmagnetischen Ankers 20 ist somit begrenzt. Um dies auszugleichen, ist der Anker 20 mit einer Ankeranschlaghülse 35 versehen, welche in einer Ausnehmung 37 des Ankermantels 34 angeordnet ist. Die Ankeranschlaghülse 35 übernimmt somit neben der Funktion der Ankerführung auf der Ventilnadel 3 auch die Durchführung des Brennstoffs über zumindest einen Flächenanschliff 36 sowie die Festlegung der Ankeranschläge an dem ersten Flansch 21, der zulaufseitig des Ankers 20 mit der Ventilnadel 3 über eine Schweißnaht 22 verbunden ist, und einem zweiten Flansch 31, der abströmseitig des Ankers 20 angeordnet und ebenfalls über eine Schweißnaht 33 mit der Ventilnadel 3 verbunden ist. Zwischen dem zweiten Flansch 31 und der Ankeranschlaghülse 35 ist zur Dämpfung von Ventilnadelprellern zusätzlich ein Dämpfungselement 32 vorgesehen. Es kann, wie im vorliegenden Ausführungsbeispiel, als O-Ring 32 ausgeführt sein, aber auch in Form einer Membran ausgebildet sein.According to the invention, the armature 20 of the fuel injection valve 1 is made in two parts. An outer armature shell 34 is made of a soft magnetic material having the advantage of high magnetic flux. However, soft magnetic materials have the disadvantage of poor resistance to mechanical wear, so that over time by the operation of the fuel injection valve 1 malfunctions can occur, for example, by changing the armature stroke. The life of a soft magnetic armature 20 is thus limited. To compensate for this, the armature 20 is provided with an anchor stop sleeve 35, which is arranged in a recess 37 of the anchor jacket 34. The armature stop sleeve 35 thus takes over the function of the armature guide on the valve needle 3 and the implementation of the fuel on at least one Flächenanschliff 36 and the determination of the anchor stops on the first flange 21, the inlet side of the armature 20 is connected to the valve needle 3 via a weld 22 , and a second flange 31, which is arranged downstream of the armature 20 and also connected via a weld 33 with the valve needle 3. Between the second flange 31 and the anchor stop sleeve 35, a damping element 32 is additionally provided for damping valve needle bouncers. It may, as in the present embodiment, be designed as an O-ring 32, but also be designed in the form of a membrane.

Eine detailliertere Darstellung und Beschreibung der erfindungsgemäßen Maßnahmen ist der Beschreibung zu den Fig. 2A bis 2C zu entnehmen.A more detailed description and description of the measures according to the invention can be found in the description of FIGS. 2A to 2C.

In der Ventilnadelführung 14 und am Ventilsitzkörper 5 verlaufen Brennstoffkanäle 30a und 30b. Der Brennstoff wird über eine zentrale Brennstoffzufuhr 16 zugeführt und durch ein Filterelement 25 gefiltert. Das Brennstoffeinspritzventil 1 ist durch eine Dichtung 28 gegen eine nicht weiter dargestellte Brennstoffleitung abgedichtet.In the valve needle guide 14 and the valve seat body 5 are fuel passages 30a and 30b. The fuel is supplied via a central fuel supply 16 and filtered by a filter element 25. The fuel injection valve 1 is sealed by a seal 28 against a fuel line, not shown.

Im Ruhezustand des Brennstoffeinspritzventils 1 wird der Anker 20 von der Rückstellfeder 23 entgegen seiner Hubrichtung so beaufschlagt, daß der Ventilschließkörper 4 am Ventilsitz 6 in dichtender Anlage gehalten wird. Bei Erregung der Magnetspule 10 baut diese ein Magnetfeld auf, welches den Anker 20 entgegen der Federkraft der Rückstellfeder 23 in Hubrichtung bewegt, wobei der Hub durch einen in der Ruhestellung zwischen dem Innenpol 12 und dem Anker 20 befindlichen Arbeitsspalt 27 vorgegeben ist. Der Anker 20 nimmt den Flansch 21, welcher mit der Ventilnadel 3 verschweißt ist, ebenfalls in Hubrichtung mit. Der mit der Ventilnadel 3 in Verbindung stehende Ventilschließkörper 4 hebt von der Ventilsitzfläche 6 ab und der Brennstoff wird durch die Abspritzöffnung 7 abgespritzt.In the idle state of the fuel injection valve 1, the armature 20 is acted upon by the return spring 23 counter to its stroke direction so that the valve closing body 4 is held on the valve seat 6 in sealing engagement. Upon energization of the solenoid 10, this builds up a magnetic field, which moves the armature 20 against the spring force of the return spring 23 in the stroke direction, wherein the stroke through a given in the rest position between the inner pole 12 and the armature 20 working gap 27 is specified. The armature 20 takes the flange 21, which is welded to the valve needle 3, also in the stroke direction with. The valve closing body 4 communicating with the valve needle 3 lifts off from the valve seat surface 6 and the fuel is sprayed off through the injection opening 7.

Wird der Spulenstrom abgeschaltet, fällt der Anker 20 nach genügendem Abbau des Magnetfeldes durch den Druck der Rückstellfeder 23 vom Innenpol 13 ab, wodurch sich der mit der Ventilnadel 3 in Verbindung stehende Flansch 21 entgegen der Hubrichtung bewegt. Die Ventilnadel 3 wird dadurch in die gleiche Richtung bewegt, wodurch der Ventilschließkörper 4 auf der Ventilsitzfläche 6 aufsetzt und das Brennstoffeinspritzventil 1 geschlossen wird.If the coil current is turned off, the armature 20 drops after sufficient degradation of the magnetic field by the pressure of the return spring 23 from the inner pole 13, whereby the standing with the valve needle 3 in connection flange 21 moves against the stroke direction. The valve needle 3 is thereby moved in the same direction, whereby the valve closing body 4 touches on the valve seat surface 6 and the fuel injection valve 1 is closed.

Fig. 2A zeigt in einer ungeschnittenen Darstellung eine Gesamtansicht des zweiteiligen Ankers 20 mit dem zweiten Flansch 31 und dem Dämpfungselement 32 auf der Ventilnadel 3.FIG. 2A shows in an uncut illustration an overall view of the two-part armature 20 with the second flange 31 and the damping element 32 on the valve needle 3.

Übereinstimmende Bauteile sind in allen Figuren mit übereinstimmenden Bezugszeichen versehen.Matching components are provided in all figures with corresponding reference numerals.

Fig. 2A verdeutlicht das vormontierte Gesamtbauteil, welches in das Gehäuse 2 des Brennstoffeinspritzventils 1 eingesetzt wird. Auf die Ventilnadel 3 wird der in Fig. 2A nicht dargestellte erste Flansch 21 aufgeschoben und mit der Ventilnadel 3 verschweißt. Der zweiteilige Anker 20, der aus dem Ankermantel 34 und der Ankeranschlaghülse 35 besteht, wird ebenfalls auf die Ventilnadel 3 aufgeschoben. Danach wird das im Ausführungsbeispiel als O-Ring ausgebildete Dämpfungselement 32 entweder gemeinsam mit dem zweiten Flansch 32 oder separat auf die Ventilnadel 3 aufgeschoben und schließlich der zweite Flansch 32 unter einem vorgegebenen Abstand, der dem gewünschten Hub der Ventilnadel 3 entspricht, ebenfalls mit der Ventilnadel 3 verschweißt.FIG. 2A illustrates the preassembled overall component, which is inserted into the housing 2 of the fuel injection valve 1. On the valve needle 3, not shown in Fig. 2A first flange 21 is pushed and welded to the valve needle 3. The two-part armature 20, which consists of the armature jacket 34 and the anchor stop sleeve 35 is also pushed onto the valve needle 3. Thereafter, the formed in the embodiment as an O-ring damping element 32 is pushed either together with the second flange 32 or separately on the valve needle 3 and finally the second flange 32 at a predetermined distance corresponding to the desired stroke of the valve needle 3, also with the valve needle 3 welded.

Die Rückstellfeder 23 stützt sich auf dem in Fig. 2A nicht dargestellten ersten Flansch 21 ab, der an der bündig mit einer zulaufseitigen Stirnseite 38 des Ankermantels 34 abschließenden Ankeranschlaghülse 35 anliegt. Ein abströmseitiges Ende 39 der Ankeranschlaghülse 35 stützt sich an dem unter Vorspannung stehenden Dämpfungselement 32 ab, welches auf dem zweiten Flansch 31 aufliegt. Somit schlägt der Ankermantel 34 während des Betriebs des Brennstoffeinspritzventils 1 weder an dem ersten Flansch 21 noch an dem zweiten Flansch 31 an, sondern lediglich an dem verhältnismäßig großflächigen und daher unkritischen Innenpol 13 des Magnetkreises. Die Verformung des weichmagnetischen Ankermantels 34 sowie nachfolgende Fehlfunktionen durch ungenaue Zumessung können damit vermieden werden. Die nicht weichmagnetische Ankeranschlaghülse 35 stört den Fluß des magnetischen Feldes durch den Anker 20 nicht.The return spring 23 is supported on the first flange 21, not shown in FIG. 2A, which rests against the armature stop sleeve 35 which terminates flush with an inlet-side end face 38 of the anchor jacket 34. An outflow-side end 39 of the armature stop sleeve 35 is supported on the prestressed damping element 32, which rests on the second flange 31. Thus, during operation of the fuel injection valve 1, the armature jacket 34 strikes neither on the first flange 21 nor on the second flange 31, but only on the relatively large-area and therefore noncritical inner pole 13 of the magnetic circuit. The deformation of the soft magnetic anchor jacket 34 and subsequent malfunction due to inaccurate metering can thus be avoided. The non-soft magnetic anchor stop sleeve 35 does not disturb the flow of the magnetic field through the armature 20.

Fig. 2B zeigt in einer auszugsweisen Schnittdarstellung einen Schnitt durch den Ankermantel 34 und die Ankeranschlaghülse 35. In Fig. 2B sind insbesondere im Ausführungsbeispiel drei Flächenanschliffe 36 deutlich erkennbar, die die Durchführung des Brennstoffs durch den Anker 20 übernehmen. Dadurch können separate Bohrungen im Ankermantel 34, die die Stabilität und Symmetrie des weichmagnetischen Ankermantels 34 beeinträchtigen können, vermieden werden.FIG. 2B shows, in an excerpted sectional view, a section through the armature jacket 34 and the anchor stop sleeve 35. In particular, in the exemplary embodiment, three surface contours 36 are clearly recognizable, which take over the passage of the fuel through the armature 20. As a result, separate holes in the armature jacket 34, which can affect the stability and symmetry of the soft-magnetic anchor jacket 34, can be avoided.

Die Flächenanschliffe 36 können bereits bei der Fertigung der Ankeranschlaghülse 35 an dieser angebracht werden. Die Ankeranschlaghülse 35 ist vorzugsweise durch Drehen oder durch Tiefziehen kostengünstig herstellbar.The Flächenanschliffe 36 can be attached to this already in the manufacture of the anchor stop sleeve 35. The anchor stop sleeve 35 is preferably inexpensive to produce by turning or by deep drawing.

Fig. 2C zeigt in einer auszugsweisen Schnittdarstellung einen Ausschnitt aus Fig. 1 im Bereich IIC bzw. einen maßstabsgetreuen Schnitt durch das in Fig. 2A dargestellte Gesamtbauteil.FIG. 2C shows an excerpt from a section from FIG. 1 in the area IIC or a true-to-scale section through the overall component shown in FIG. 2A.

Wie in Fig. 2C erkennbar, ist die Ankeranschlaghülse 35 gestuft ausgeführt, um die korrekte Montage des Ankermantels 34 und der Ankeranschlaghülse 35 zu gewährleisten.As can be seen in FIG. 2C, the anchor stop sleeve 35 is stepped in order to ensure the correct assembly of the anchor jacket 34 and the anchor stop sleeve 35.

Zusätzlich ist in. Fig. 2C eine Drainageausnehmung 40 der Ankeranschlaghülse 35 mit einer Bohrung 41 dargestellt, die Brennstoff, der sich während des Betriebes des Brennstoffeinspritzventils 1 durch eine Pumpwirkung in einer Ausnehmung 42 der Ankeranschlaghülse 35 zwischen dieser und der ventilnadel 3 sammelt, in einen Innenraum 42 des Brennstoffeinspritzventils 1 abführt. Dadurch kann sichergestellt werden, daß das Dämpfungselement 32 in seiner Lage verbleibt und nicht durch den Brennstoffdruck verdrängt wird, was zu Fehlfunktionen des Brennstoffeinspritzventils 1 führen kann.In addition, in Fig. 2C a drainage recess 40 of the anchor stop sleeve 35 is shown with a bore 41, the fuel, which collects during operation of the fuel injection valve 1 by a pumping action in a recess 42 of the anchor stop sleeve 35 between this and the valve needle 3, in a Interior 42 of the fuel injection valve 1 dissipates. This can ensure that the damping element 32 remains in its position and is not displaced by the fuel pressure, which can lead to malfunction of the fuel injection valve 1.

Die Erfindung ist nicht auf die dargestellten Ausführungsbeispiele beschränkt und z. B. auch für andere. Formen von Ankern 20, beispielsweise für Flachanker, sowie für beliebige Formen von Brennstoffeinspritzventilen 1 anwendbar.The invention is not limited to the illustrated embodiments and z. B. for others. Forms of anchors 20, for example, for flat anchors, as well as for any forms of fuel injection valves 1 applicable.

Claims (14)

  1. Fuel injection valve (1) for the direct injection of fuel into the combustion space of an internal combustion engine, having a valve needle (3) which is operatively connected to a valve-closing body (4), which with a valve-seat surface (6) forms a sealing seat, and having an armature (20) which is arranged axially moveably on the valve needle (3) and cooperates with a magnet coil (10),
    characterized
    in that the armature (20) comprises an armature casing (34) and an armature abutment sleeve (35), the armature abutment sleeve (35) being introduced positively into an inner recess (37) of the armature casing (34) and butting against at least one flange (21, 31) which is connected non-positively to the valve needle (3).
  2. Fuel injection valve according to Claim 1,
    characterized
    in that the armature casing (34) is manufactured from a soft-magnetic material.
  3. Fuel injection valve according to Claim 1 or 2,
    characterized
    in that the armature abutment sleeve (35) consists of a material which differs from that of the armature casing (34).
  4. Fuel injection valve according to Claim 3,
    characterized
    in that the armature abutment sleeve (35) is manufactured from a hardened metal or a hard metal alloy.
  5. Fuel injection valve according to one of Claims 1 to 4,
    characterized
    in that the armature abutment sleeve (35) is pressed into the armature casing (34).
  6. Fuel injection valve according to one of Claims 1 to 4,
    characterized
    in that the armature abutment sleeve (35) is welded to the armature casing (34).
  7. Fuel injection valve according to one of Claims 1 to 6,
    characterized
    in that the armature abutment sleeve (35) is flush on an inflow-side end face (38) with the armature casing (34).
  8. Fuel injection valve according to Claim 7,
    characterized
    in that on the inflow-side end face (38) of the armature abutment sleeve (35) is supported a first flange (21) connected non-positively to the valve needle (3) via a weld seam (22).
  9. Fuel injection valve according to Claim 8,
    characterized
    in that a return spring (23) is supported on that side of the first flange (21) which lies opposite the armature abutment sleeve (35).
  10. Fuel injection valve according to one of Claims 1 to 9,
    characterized
    in that the armature abutment sleeve (35) bears with an outflow-side end (39) against a damping element (32).
  11. Fuel injection valve according to Claim 10,
    characterized
    in that the damping element (32) is supported on a second flange (31) which is connected non-positively to the valve needle (3) by means of a weld seam (33).
  12. Fuel injection valve according to one of Claims 1 to 11,
    characterized
    in that at least one ground-down surface portion (36) is provided on the armature abutment sleeve (35).
  13. Fuel injection valve according to one of Claims 1 to 12,
    characterized
    in that a drainage recess (40) is provided in the armature abutment sleeve (35).
  14. Fuel injection valve according to Claim 13,
    characterized
    in that the drainage recess (40) is drained via a bore (41) into an inner space (42) of the fuel injection valve (1).
EP02740335A 2001-05-21 2002-05-10 Fuel injection valve Expired - Lifetime EP1395746B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10124743A DE10124743A1 (en) 2001-05-21 2001-05-21 Fuel injection valve for an internal combustion engine comprises an armature having an armature buffer sleeve inserted in a form-locking manner into an inner recess of an armature casing
DE10124743 2001-05-21
PCT/DE2002/001691 WO2002095215A1 (en) 2001-05-21 2002-05-10 Fuel injection valve

Publications (2)

Publication Number Publication Date
EP1395746A1 EP1395746A1 (en) 2004-03-10
EP1395746B1 true EP1395746B1 (en) 2006-04-05

Family

ID=7685598

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02740335A Expired - Lifetime EP1395746B1 (en) 2001-05-21 2002-05-10 Fuel injection valve

Country Status (6)

Country Link
US (1) US20040026541A1 (en)
EP (1) EP1395746B1 (en)
JP (1) JP2004519619A (en)
CN (1) CN1463326A (en)
DE (2) DE10124743A1 (en)
WO (1) WO2002095215A1 (en)

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EP2851551B1 (en) * 2013-09-20 2016-05-25 Continental Automotive GmbH Fluid injection valve
EP3076004B1 (en) * 2015-04-02 2018-09-12 Continental Automotive GmbH Valve assembly with a particle retainer element and fluid injection valve
CN109154261B (en) * 2016-06-02 2021-06-08 大陆汽车有限公司 Valve assembly for an injection valve and injection valve
DE102018200364A1 (en) * 2018-01-11 2019-07-11 Robert Bosch Gmbh Valve for metering a fluid
DE102020213354A1 (en) * 2020-10-22 2022-04-28 Robert Bosch Gesellschaft mit beschränkter Haftung fuel injector
GB2613392B (en) * 2021-12-02 2024-04-03 Phinia Delphi Luxembourg Sarl Fuel pump

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Also Published As

Publication number Publication date
JP2004519619A (en) 2004-07-02
US20040026541A1 (en) 2004-02-12
WO2002095215A1 (en) 2002-11-28
CN1463326A (en) 2003-12-24
EP1395746A1 (en) 2004-03-10
DE50206318D1 (en) 2006-05-18
DE10124743A1 (en) 2002-11-28

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