EP1080305B1 - Fuel injection valve - Google Patents

Fuel injection valve Download PDF

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Publication number
EP1080305B1
EP1080305B1 EP99957921A EP99957921A EP1080305B1 EP 1080305 B1 EP1080305 B1 EP 1080305B1 EP 99957921 A EP99957921 A EP 99957921A EP 99957921 A EP99957921 A EP 99957921A EP 1080305 B1 EP1080305 B1 EP 1080305B1
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EP
European Patent Office
Prior art keywords
actuator
fuel injection
injection valve
fuel
valve according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP99957921A
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German (de)
French (fr)
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EP1080305A1 (en
EP1080305B2 (en
Inventor
Wolfgang Ruehle
Hubert Stier
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Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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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
    • 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
    • F02M51/0603—Injectors peculiar thereto with means directly operating the valve needle using piezoelectric or magnetostrictive operating 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
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
    • F02M61/08—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series the valves opening in direction of fuel flow
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/0057—Means for avoiding fuel contact with valve actuator, e.g. isolating actuators by using bellows or diaphragms
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/16—Sealing of fuel injection apparatus not otherwise provided for

Definitions

  • the invention is based on a fuel injector according to the preamble of claim 1.
  • valve needle Since the valve needle is firmly connected to the pressure shoulder, the valve needle on the spray side and the pressure shoulder sealing and moveable in the valve body are, the production is relatively complex and the fuel injector susceptible to bending or Tension of the valve needle or the change in relative positions of the two sliding surfaces.
  • the fuel injector according to the invention with the Features of claim 1 has the advantage that a simple solution provides an inexpensive, low-wear, friction-free and considerably more compact Construction results. Furthermore, the seal is independent from the design of the valve needle and can therefore be Variety of fuel injectors can be integrated.
  • the actuator jacket is advantageously wave-shaped or folded. This causes a large actuator stroke in the Actuator housing made possible in a compact design.
  • the actuator is advantageously part of the actuator jacket a biasing force. Additional components, such as z. B. compression springs can be omitted.
  • Advantageously is between the actuator jacket and the actuator thermally conductive material, in particular a thermal paste, intended. This means that when the actuator is actuated generated energy dissipated in the actuator from the actuator the thermally conductive material and from that to that Actuator housing are forwarded. This will make the thermal load on the actuator is reduced and the Fuel injector life extended.
  • the seal advantageously has a tubular shape Sleeve that penetrates the recess of the actuator and the is at least partially enclosed by the actuator. As a result, the interior of the tubular sleeve is against the The actuator is sealed and the fuel can flow through it become.
  • the seal advantageously has a on the sealing seat-side sealing plate with the actuator jacket and / or is connected to the sleeve. This enables the actuator on the sealing seat side sealing plate on devices of the Fuel injector act or on this support. In addition, the sealing plate on the sealing seat side similar to the inflow-side sealing plate, which simplifies the manufacture of the seal.
  • the sealing plates are advantageously cup-shaped, whereby inside the sealing plates facilities of the fuel injector can be included. Moreover can make the sealing plates easier in a guide be performed.
  • Each sealing plate advantageously has one Recess through which the sleeve passes.
  • the sleeve is expanded on at least one sealing plate bent back and on one of the other sealing plate facing end face connected to this sealing plate. This enables a large actuator stroke in the actuator housing.
  • At least one of the sealing plates is advantageously cup-shaped formed, and projects over an edge region of the sealing plate the bent-back area of the sleeve. This is the Protected bent-back area of the sleeve.
  • the inlet-side sealing plate advantageously has at least one supply channel through which at least an electrical lead is led to the actuator. Thereby is the electrical lead in a simple manner in the Interior of the seal led.
  • the feed channel against the fuel is advantageous sealed. This will seal the electrical Supply line against the fuel in the sealing plate integrated, eliminating the need for an additional seal can and results in a more compact design.
  • the sleeve is part of a different one Fuel inlet nozzle extending to the sealing seat Fuel line. This simplifies the Fuel line especially for one end attached fuel connection. In addition, a additional fuel line is eliminated, which means Have components saved.
  • Fig. 1 shows an axial excerpt Sectional view of a fuel injector according to the invention 1.
  • the fuel injector 1 is used especially for direct fuel injection, especially of gasoline in a combustion chamber mixture-compressing, spark-ignited internal combustion engine as so-called gasoline direct injection valve.
  • the Fuel injection valve 1 according to the invention is suitable however also for other applications.
  • the fuel injector 1 is an internal one Fuel injector 1 executed.
  • the fuel injector 1 has a valve housing 3 and a Fuel inlet connector 4 representing fuel inlet on, which together the housing of the fuel injector 1 form.
  • the valve closing body 6 is frustoconical tapering in the spray direction educated.
  • the valve closing body 6 acts with one a valve seat surface 8 formed to a valve seat body 7 a sealing seat together.
  • the valve needle 5 is at her axial movement through valve needle guides 9, 10, which are attached to the valve housing 3. To the flow of The valve needle guides show how to enable fuel 9, 10 slot-shaped recesses 11, 12.
  • A is used to actuate the fuel injection valve 1 Actuator 13, the piezoelectric or magnetostrictive is executed.
  • the actuator 13 is actuated via an electrical control signal via an electrical Lead, which in this embodiment is simplicity is not shown for the sake of being guided to the actuator 13 becomes.
  • the actuator 13 When the actuator 13 is actuated, it expands and acts on an inflow-side sealing plate 14 on a Base plate 15, on which the valve needle 5 is attached, wherein the actuator 13 is on a sealing seat side Supporting sealing plate 16 on the valve housing 3. This will the valve needle 5 in the axial direction on the fuel inlet connector 4 moves, causing the Valve closing body 6 from the valve seat 8 Valve seat body 7 lifts and releases the sealing seat.
  • valve closing body 6 and Valve seat body 7 causes fuel to escape a fuel chamber 17 of the fuel injection valve 1 into the combustion chamber of the internal combustion engine.
  • valve needle 5 takes place in the embodiment via a Compression spring 18, which is on one side on the Base plate 15 and on the other side to the fuel inlet connector 4 supports.
  • valve housing 3 The valve housing 3, the fuel inlet port 4, the Base plate 15, the inflow-side sealing plate 14 and sealing plate side sealing plate 16 are welded 19a - 19f attached to each other. The attachment can also done on another tit.
  • the actuator jacket 20 is over a circumferential weld 22 with the inflow side Sealing plate 14 and with a circumferential weld 23 with the sealing seat side sealing plate 16 is non-detachably connected.
  • the connection can also be different, in particular releasable be executed.
  • the inflow-side sealing plate 14 and the sealing plate-side sealing plate 16 have inner recesses 24, 25 through which the sleeve 21 passes, wherein the sleeve 21 on the inflow-side sealing plate 14 in one bent back area 39 is bent back and on a circumferential weld seam 26 with an end face 37 the inflow-side sealing plate 14 and on a circumferential Weld seam 27 with the sealing plate 16 on the sealing seat side connected is.
  • the inflow-side sealing plate 14 has one Edge area 38 on which the inflow-side sealing plate 14 is connected to the base plate 15. A bent back Area 39 of sleeve 21 is separated from edge area 38 the inflow-side sealing plate 14 protrudes.
  • the inflow-side sealing plate 14 Through the Pot-shaped formation of the inflow-side sealing plate 14 can the expanded on the inflow-side sealing plate 14 and bent back sleeve 21 when the actuator 13 in Direction of the fuel inlet port 4 are moved, wherein the sealing of the actuator 13 by the sealing 14, 16, 20, 21 against the fuel remains. From the for the same reason, the actuator jacket 20 is wave-shaped or folded. In this case, through the actuator jacket 20 a bias voltage is transmitted to the actuator 13 so that the compression spring 18 can be omitted.
  • the fuel is supplied via the Fuel inlet port 4, through holes 28a, 28b in the Base plate 15 and through an inner longitudinal opening 31 Sleeve 21, through which valve needle 5 also extends, into the fuel chamber 17.
  • the fuel line can alternatively also via the interior 29 of the valve housing 3 take place, then suitable flow openings in the sealing plate-side sealing plate 16 are to be provided.
  • a space 30 between the actuator jacket 20 and the Actuator 13 can be a thermally conductive material, in particular a thermal paste can be introduced, whereby the heat of the Actuator 13 via the thermal paste in the intermediate space 30 and via the sealing seat side sealing plate 16 to the Valve housing 3 is passed.
  • a thermal paste can be introduced, whereby the heat of the Actuator 13 via the thermal paste in the intermediate space 30 and via the sealing seat side sealing plate 16 to the Valve housing 3 is passed.
  • the space between the actuator 13 and the sleeve 21 with a thermal paste to apply heat to the Dispense fuel In a corresponding way also the space between the actuator 13 and the sleeve 21 with a thermal paste to apply heat to the Dispense fuel.
  • Fig. 2 shows an axial excerpt Sectional view of a second embodiment of the Fuel injector according to the invention 1. Already described elements are with matching Provide reference numerals so that a repetitive Description unnecessary.
  • the fuel injector 1 is an externally opening fuel injector 1.
  • the pot-shaped, inflow-side Sealing plate 14 is supported on the fuel inlet connection 4, so that when the actuator 13 is actuated Direction of the sealing seat and over the sealing seat side sealing plate 16 and the base plate 15 the valve needle 5 acts, whereby the truncated cone-shaped trained to expand in the spray direction Valve closing body 6, in one piece with the valve needle 5 is formed from the valve seat surface 8 of the Valve seat body 7 lifts and releases the sealing seat.
  • the compression spring 18 which is located on the one hand on the valve housing 3 and on the other hand is supported on the base plate 15, the Valve closing body 6 against the valve seat surface 8 of the Valve seat body 7 pressed.
  • the Function of the compression spring 18 completely or partially Actuator jacket 20 are taken over.
  • the electrical lead to the actuator 13 can Supply channels 32 and 33 in the fuel inlet port 4 and take place in the sealing plate 14.
  • the feed channels 32, 33 can also vent the seal 14, 16, 20, 21 or for the drainage of leakage liquid from the seal 14, 16, 20, 21 serve.
  • the inflow of fuel towards the Sealing seat takes place via the longitudinal opening 31 and bores 28a, 28b in the base plate 15.
  • a thermally conductive Material in particular a thermal paste, introduced his.
  • Fig. 3 shows another in a sectional view Embodiment of the seal 14, 16, 20 of the actuator 13.
  • Der Actuator jacket 20 is over circumferential weld seams 22 and 23 to the inflow-side sealing plate 14 or the sealing plate-side sealing plate 16 welded.
  • the actuator 13 is located between the two cup-shaped Sealing plates 14, 16.
  • a supply channel 33 for receiving an electrical line to the actuator 13 is in the inflow-side sealing plate 14 is provided.
  • the Supply channel 33 can, however, also in the sealing seat side Sealing plate 16 may be provided.
  • Fig. 4 shows another in a sectional view Embodiment of the inflow-side sealing plate 14.
  • the feed channel 33 executed kinked, the supply channel 33 on the Circumferential surface 35 of the inflow-side sealing plate 14 opens.
  • the inflow-side sealing plate 14 With the peripheral surface 35, the inflow-side sealing plate 14 on the inner wall of the valve housing 3, in particular by Welding. This allows the electrical Line via a connection in the valve housing 3 is to be provided from the side of the fuel injector 1 through the feed channel 33 to the actuator 13.
  • the opening of the feed channel 33 on the peripheral surface 35 is to prevent the ingress of fuel to seal the fuel. This is particularly suitable a weld seam running around the opening between the Circumferential surface 35 and the valve housing 3.
  • the attachment of the actuator jacket 20 can be a smaller one Diameter than the upper peripheral surface 35 having lower peripheral surface 36 of the inflow-side sealing plate 14 respectively.
  • the one described is suitable without restriction Execution of the inflow-side sealing plate 14 also for the sealing plate side sealing plate 16.
  • the sealing plate 14 has the possibility of supplying fuel a fuel channel 40.
  • the invention is not based on those described Embodiments limited.
  • One is in particular different design of the actuator jacket 20, the sleeve 21, in particular the bent-back region 39 of the sleeve 21, and the two sealing plates 14, 16 conceivable.
  • Furthermore is the action of the actuator 13 on the valve needle 5 in the 1 and 2 are shown in simplified form and are intended to illustrate the invention do not restrict in this regard. Especially draws the invention through the possibility of using the Seal 14, 16, 20, 21 in a variety of fuel injectors 1 off.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Electrically Driven Valve-Operating Means (AREA)

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einem Brennstoffeinspritzventil nach der Gattung des Anspruchs 1.The invention is based on a fuel injector according to the preamble of claim 1.

Aus der DE 195 34 445 C2 ist ein Brennstoffeinspritzventil nach der Gattung des Anspruchs 1 bekannt. Das aus dieser Druckschrift hervorgehende Brennstoffeinspritzventil besteht aus einem Ventilkörper, in dem eine Ventilnadel koaxial geführt ist. Der Ventilkörper weist einen Anschluß auf, über welchen dem Brennstoffeinspritzventil Brennstoff zugeführt wird. Die Ventilnadel ist mit einer Zentralbohrung versehen. Abspritzseitig bildet die Ventilnadel mit dem Ventilkörper einen Dichtsitz. Der Brennstoff wird über die Zentralbohrung der Ventilnadel zum Dichtsitz geleitet. Auf ihrer Außenseite ist die Ventilnadel gegen den umgebenden Ventilkörper abgedichtet. Ein piezoelektrischer Aktor wirkt über eine Druckschulter auf die Ventilnadel ein. Die Druckschulter ist fest mit der Ventilnadel verbunden und ist zulaufseitig dicht an dem Ventilkörper geführt. Dadurch wird der Aktor vor der Einwirkung des Brennstoffdrucks geschützt. Bei dem bekannten Brennstoffeinspritzventil ergeben sich folgende Nachteile:DE 195 34 445 C2 describes a fuel injector known according to the preamble of claim 1. That from this Document resulting fuel injector exists from a valve body in which a valve needle coaxial is led. The valve body has a connection via which fuel is supplied to the fuel injector becomes. The valve needle is provided with a central bore. On the spray side, the valve needle forms with the valve body a sealing seat. The fuel is through the central bore the valve needle to the sealing seat. On their outside is the valve needle against the surrounding valve body sealed. A piezoelectric actuator works via a Pressure shoulder onto the valve needle. The pressure shoulder is firmly connected to the valve needle and is on the inlet side performed close to the valve body. This will make the actuator protected from the effects of fuel pressure. In which Known fuel injection valve result in the following Disadvantage:

Da die Ventilnadel mit der Druckschulter fest verbunden ist, die Ventilnadel abspritzseitig und die Druckschulter zulaufseitig dichtend und beweglich im Ventilkörper geführt sind, ist die Fertigung relativ aufwendig und das Brennstoffeinspritzventil anfällig gegenüber Verbiegungen oder Verspannungen der Ventilnadel bzw. der Veränderung der relativen Lagen der beiden Gleitflächen.Since the valve needle is firmly connected to the pressure shoulder, the valve needle on the spray side and the pressure shoulder sealing and moveable in the valve body are, the production is relatively complex and the fuel injector susceptible to bending or Tension of the valve needle or the change in relative positions of the two sliding surfaces.

Da die Druckschulter bzw. die Ventilnadel gegen den Ventilkörper beweglich geführt ist, kommt es zu einer Benetzung der Dichtfläche mit Brennstoff und wegen dem hohen Brennstoffdruck zu einem Zufluß von Brennstoff in Richtung des Aktors. Somit ist der Aktor nur gegen die Einwirkung des Brennstoffdrucks nicht jedoch gegen die Einwirkung des Brennstoffs geschützt. Durch die Abdichtung zwischen Druckschulter bzw. Düsennadel und Düsenkörper kommt es bei Betätigung des Brennstoffeinspritzventils zu Reibungsverlusten. Dadurch wird die Formbarkeit des Brennstoffstrahls verschlechtert, die Schaltzeiten des Ventils vergrößern sich, die Aktorenergie kann schlechter ausgenützt werden, und es kommt zu einem erhöhten Verschleiß des Brennstoffeinspritzventils. Insbesondere kommt es im Laufe des Betriebs zu einer nachlassenden Dichtigkeit der zwischen Druckschulter bzw. Düsennadel und Düsenkörper ausgebildeten Dichtflächen.Since the pressure shoulder or the valve needle against the Valve body is guided movably, there is a Wetting the sealing surface with fuel and because of the high Fuel pressure towards an inflow of fuel towards of the actuator. Thus, the actuator is only against the influence of the However, fuel pressure does not counteract the action of the Fuel protected. By sealing between Pressure shoulder or nozzle needle and nozzle body come into play Actuation of the fuel injector too Friction losses. This will improve the formability of the Fuel jet deteriorates the switching times of the Valve enlarge, the actuator energy can be worse exploited, and there is increased wear of the fuel injector. In particular, it occurs in the Over the course of time, the tightness of the between pressure shoulder or nozzle needle and nozzle body trained sealing surfaces.

Da die Zentralbohrung in der Ventilnadel Teil einer sich von dem Brennstoffeinlaßstutzen bis zum Dichtsitz erstreckenden Brennstoffleitung ist, ist die Fertigung der Ventilnadel aufwendig und das Brennstoffeinspritzventil ist insbesondere an seinem dichtsitzseitigen Ende anfällig gegenüber Schmutzablagerungen.Since the central bore in the valve needle is part of a the fuel inlet pipe extending to the sealing seat Fuel line is the manufacture of the valve needle expensive and the fuel injector is particularly susceptible to at its sealing seat end Dirt.

Vorteile der ErfindungAdvantages of the invention

Das erfindungsgemäße Brennstoffeinspritzventil mit den Merkmalen des Anspruchs 1 hat demgegenüber den Vorteil, daß sich durch eine einfache Lösung eine kostengünstige, verschleißarme, reibungsfreie und erheblich kompaktere Bauweise ergibt. Des weiteren ist die Abdichtung unabhängig von der Ausführung der Ventilnadel und kann somit in eine Vielzahl von Brennstoffeinspritzventilen integriert werden. The fuel injector according to the invention with the Features of claim 1 has the advantage that a simple solution provides an inexpensive, low-wear, friction-free and considerably more compact Construction results. Furthermore, the seal is independent from the design of the valve needle and can therefore be Variety of fuel injectors can be integrated.

Außerdem kann der auf diese Weise mit der Abdichtung gegen den Brennstoff abgedichtete Aktor ohne größere bauliche Änderungen sowohl in ein innenöffnendes als auch in ein außenöffnendes Brennstoffeinspritzventil integriert werden. Außerdem ist der Aktor durch die Abdichtung sowohl gegen die Einwirkung des Brennstoffs als auch gegen die Einwirkung des Brennstoffdrucks geschützt.It can also be used to seal against the fuel sealed actuator without major structural Changes in both an inside opening and an inside externally opening fuel injection valve can be integrated. In addition, the actuator is sealed against both the Action of the fuel as well as against the action of the Fuel pressure protected.

Durch die in den abhängigen Ansprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen des im Anspruch 1 angegebenen Brennstoffeinspritzventils möglich.By the measures listed in the dependent claims advantageous developments of that specified in claim 1 Fuel injector possible.

In vorteilhafter Weise ist der Aktormantel wellenförmig oder gefaltet ausgebildet. Dadurch wird ein großer Aktorhub im Aktorgehäuse in einer kompakten Bauweise ermöglicht. In vorteilhafter Weise ist der Aktor von dem Aktormantel mit einer Vorspannkraft beaufschlagt. Zusätzliche Bauteile, wie z. B. Druckfedern, können entfallen. In vorteilhafter Weise ist zwischen dem Aktormantel und dem Aktor ein wärmeleitfähiges Material, insbesondere eine Wärmeleitpaste, vorgesehen. Dadurch kann die bei Betätigung des Aktors entstandene, im Aktor dissipierte Energie von dem Aktor auf das wärmeleitfähige Material und von diesem an das Aktorgehäuse weitergeleitet werden. Dadurch wird die thermische Belastung des Aktors vermindert und die Lebensdauer des Brennstoffeinspritzventils verlängert.The actuator jacket is advantageously wave-shaped or folded. This causes a large actuator stroke in the Actuator housing made possible in a compact design. In The actuator is advantageously part of the actuator jacket a biasing force. Additional components, such as z. B. compression springs can be omitted. Advantageously is between the actuator jacket and the actuator thermally conductive material, in particular a thermal paste, intended. This means that when the actuator is actuated generated energy dissipated in the actuator from the actuator the thermally conductive material and from that to that Actuator housing are forwarded. This will make the thermal load on the actuator is reduced and the Fuel injector life extended.

In vorteilhafter Weise weist die Abdichtung eine rohrförmige Hülse auf, die die Aussparung des Aktors durchdringt und die von dem Aktor zumindest abschnittsweise umschlossen ist. Dadurch ist das Innere der rohrförmigen Hülse gegen den Aktor abgedichtet und kann somit vom Brennstoff durchflossen werden.The seal advantageously has a tubular shape Sleeve that penetrates the recess of the actuator and the is at least partially enclosed by the actuator. As a result, the interior of the tubular sleeve is against the The actuator is sealed and the fuel can flow through it become.

In vorteilhafter Weise weist die Abdichtung eine dichtsitzseitige Dichtplatte auf, die mit dem Aktormantel und/oder mit der Hülse verbunden ist. Dadurch kann der Aktor über die dichtsitzseitige Dichtplatte auf Einrichtungen des Brennstoffeinspritzventils einwirken bzw. sich an diesen abstützen. Außerdem kann die dichtsitzseitige Dichtplatte ähnlich wie die zuflußseitige Dichtplatte gestaltet werden, wodurch die Fertigung der Abdichtung vereinfacht wird.The seal advantageously has a on the sealing seat-side sealing plate with the actuator jacket and / or is connected to the sleeve. This enables the actuator on the sealing seat side sealing plate on devices of the Fuel injector act or on this support. In addition, the sealing plate on the sealing seat side similar to the inflow-side sealing plate, which simplifies the manufacture of the seal.

Vorteilhaft sind die Dichtplatten topfförmig ausgebildet, wodurch im Inneren der Dichtplatten Einrichtungen des Brennstoffeinspritzventils aufgenommen werden können. Außerdem können die Dichtplatten dadurch leichter in einer Führung geführt werden.The sealing plates are advantageously cup-shaped, whereby inside the sealing plates facilities of the fuel injector can be included. Moreover can make the sealing plates easier in a guide be performed.

In vorteilhafter Weise weist jede Dichtplatte jeweils eine Aussparung auf, durch welche die Hülse hindurchtritt. Dabei ist die Hülse an zumindest einer Dichtplatte aufgeweitet zurückgebogen und an einer der jeweils anderen Dichtplatte abgewandten Stirnfläche mit dieser Dichtplatte verbunden. Dadurch wird ein großer Aktorhub im Aktorgehäuse ermöglicht.Each sealing plate advantageously has one Recess through which the sleeve passes. there the sleeve is expanded on at least one sealing plate bent back and on one of the other sealing plate facing end face connected to this sealing plate. This enables a large actuator stroke in the actuator housing.

Vorteilhaft ist zumindest eine der Dichtplatten topfförmig ausgebildet, und ein Randbereich der Dichtplatte überragt den zurückgebogenen Bereich der Hülse. Dadurch ist der zurückgebogene Bereich der Hülse geschützt.At least one of the sealing plates is advantageously cup-shaped formed, and projects over an edge region of the sealing plate the bent-back area of the sleeve. This is the Protected bent-back area of the sleeve.

In vorteilhafter Weise weist die zulaufseitige Dichtplatte zumindest einen Zuleitungskanal auf, durch welchen zumindest eine elektrische Zuleitung an den Aktor geführt ist. Dadurch wird die elektrische Zuleitung in einfacher Weise in das Innere der Abdichtung geführt.The inlet-side sealing plate advantageously has at least one supply channel through which at least an electrical lead is led to the actuator. Thereby is the electrical lead in a simple manner in the Interior of the seal led.

Vorteilhaft ist der Zuleitungskanal gegen den Brennstoff abgedichtet. Dadurch wird die Abdichtung der elektrischen Zuleitung gegen den Brennstoff in die Dichtplatte integriert, wodurch eine zusätzliche Abdichtung entfallen kann und sich eine kompaktere Bauweise ergibt.The feed channel against the fuel is advantageous sealed. This will seal the electrical Supply line against the fuel in the sealing plate integrated, eliminating the need for an additional seal can and results in a more compact design.

In vorteilhafter Weise ist die Hülse Teil einer sich von dem Brennstoffeinlaßstutzen bis zum Dichtsitz erstreckenden Brennstoffleitung. Dadurch vereinfacht sich die Brennstoffleitung insbesondere für einen endseitig angebrachten Brennstoffanschluß. Außerdem kann eine zusätzliche Brennstoffleitung entfallen, wodurch sich Bauteile einsparen lassen.Advantageously, the sleeve is part of a different one Fuel inlet nozzle extending to the sealing seat Fuel line. This simplifies the Fuel line especially for one end attached fuel connection. In addition, a additional fuel line is eliminated, which means Have components saved.

Zeichnungdrawing

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

Fig. 1
einen auszugsweisen axialen Schnitt durch ein erstes Ausführungsbeispiel eines erfindungsgemäßen Brennstoffeinspritzventils, wobei das Brennstoffeinspritzventil nach innen öffnend ausgeführt ist;
Fig. 2
einen auszugsweisen axialen Schnitt durch ein zweites Ausführungsbeispiel eines erfindungsgemäßen Brennstoffeinspritzventils, wobei das Brennstoffeinspritzventil nach außen öffnend ausgeführt ist;
Fig. 3
einen axialen Schnitt durch einen Aktor mit Abdichtung; und
Fig. 4
einen axialen Schnitt durch eine Dichtplatte.
Embodiments of the invention are shown in simplified form in the drawing and explained in more detail in the following description. Show it:
Fig. 1
an excerpt axial section through a first embodiment of a fuel injection valve according to the invention, wherein the fuel injection valve is designed to open inwards;
Fig. 2
an excerpt axial section through a second embodiment of a fuel injection valve according to the invention, wherein the fuel injection valve is designed to open outwards;
Fig. 3
an axial section through an actuator with a seal; and
Fig. 4
an axial section through a sealing plate.

Beschreibung der AusführungsbeispieleDescription of the embodiments

Fig. 1 zeigt in einer auszugsweisen axialen Schnittdarstellung ein erfindungsgemäßes Brennstoffeinspritzventil 1. Das Brennstoffeinspritzventil 1 dient insbesondere zum direkten Einspritzen von Brennstoff, insbesondere von Benzin in einen Brennraum einer gemischverdichtenden, fremdgezündeten Brennkraftmaschine als sogenanntes Benzindirekteinspritzventil. Das erfindungsgemäße Brennstoffeinspritzventil 1 eignet sich jedoch auch für andere Anwendungsfälle.Fig. 1 shows an axial excerpt Sectional view of a fuel injector according to the invention 1. The fuel injector 1 is used especially for direct fuel injection, especially of gasoline in a combustion chamber mixture-compressing, spark-ignited internal combustion engine as so-called gasoline direct injection valve. The Fuel injection valve 1 according to the invention is suitable however also for other applications.

Das Brennstoffeinspritzventil 1 ist als innenöffnendes Brennstoffeinspritzventil 1 ausgeführt. Das Brennstoffeinspritzventil 1 weist ein Ventilgehäuse 3 und einen den Brennstoffeinlaß darstellenden Brennstoffeinlaßstutzen 4 auf, die zusammen das Gehäuse des Brennstoffeinspritzventils 1 bilden. Im Ventilgehäuse 3 befinden sich ein mittels einer Ventilnadel 5 betätigbarer Ventilschließkörper 6, der in dem dargestellten Ausführungsbeispiel mit der Ventilnadel 5 einteilig ausgebildet ist. Der Ventilschließkörper 6 ist kegelstumpfförmig sich in Abspritzrichtung verjüngend ausgebildet. Der Ventilschließkörper 6 wirkt mit einer an einem Ventilsitzkörper 7 ausgebildeten Ventilsitzfläche 8 zu einem Dichtsitz zusammen. Die Ventilnadel 5 wird bei ihrer axialen Bewegung durch Ventilnadelführungen 9, 10 geführt, die am Ventilgehäuse 3 befestigt sind. Um den Durchfluß von Brennstoff zu ermöglichen, weisen die Ventilnadelführungen 9, 10 schlitzförmige Aussparungen 11, 12 auf.The fuel injector 1 is an internal one Fuel injector 1 executed. The fuel injector 1 has a valve housing 3 and a Fuel inlet connector 4 representing fuel inlet on, which together the housing of the fuel injector 1 form. In the valve housing 3 there are a means of Valve needle 5 actuatable valve closing body 6, which in the illustrated embodiment with the valve needle 5th is formed in one piece. The valve closing body 6 is frustoconical tapering in the spray direction educated. The valve closing body 6 acts with one a valve seat surface 8 formed to a valve seat body 7 a sealing seat together. The valve needle 5 is at her axial movement through valve needle guides 9, 10, which are attached to the valve housing 3. To the flow of The valve needle guides show how to enable fuel 9, 10 slot-shaped recesses 11, 12.

Zur Betätigung des Brennstoffeinspritzventils 1 dient ein Aktor 13, der piezoelektrisch oder magnetostriktiv ausgeführt ist. Die Betätigung des Aktors 13 erfolgt über ein elektrisches Steuersignal, das über eine elektrische Zuleitung, die in diesem Ausführungsbeispiel der Einfachheit halber nicht eingezeichnet ist, an den Aktor 13 geführt wird. Bei der Betätigung des Aktors 13 dehnt sich dieser aus und wirkt über eine zuflußseitige Dichtplatte 14 auf eine Grundplatte 15, an der die Ventilnadel 5 befestigt ist, ein, wobei der Aktor 13 sich über eine dichtsitzseitige Dichtplatte 16 an dem Ventilgehäuse 3 abstützt. Dadurch wird die Ventilnadel 5 in axialer Richtung auf den Brennstoffeinlaßstutzen 4 zubewegt, wodurch der Ventilschließkörper 6 von der Ventilsitzfläche 8 des Ventilsitzkörpers 7 abhebt und den Dichtsitz freigibt. Durch den entstandenen Spalt zwischen Ventilschließkörper 6 und Ventilsitzkörper 7 kommt es zum Austritt von Brennstoff aus einer Brennstoffkammer 17 des Brennstoffeinspritzventils 1 in die Brennkammer der Brennkraftmaschine. Die Rückstellung der Ventilnadel 5 erfolgt im Ausführungsbeispiel über eine Druckfeder 18, die sich auf der einen Seite an der Grundplatte 15 und an der anderen Seite an dem Brennstoffeinlaßstutzen 4 abstützt. A is used to actuate the fuel injection valve 1 Actuator 13, the piezoelectric or magnetostrictive is executed. The actuator 13 is actuated via an electrical control signal via an electrical Lead, which in this embodiment is simplicity is not shown for the sake of being guided to the actuator 13 becomes. When the actuator 13 is actuated, it expands and acts on an inflow-side sealing plate 14 on a Base plate 15, on which the valve needle 5 is attached, wherein the actuator 13 is on a sealing seat side Supporting sealing plate 16 on the valve housing 3. This will the valve needle 5 in the axial direction on the fuel inlet connector 4 moves, causing the Valve closing body 6 from the valve seat 8 Valve seat body 7 lifts and releases the sealing seat. By the resulting gap between valve closing body 6 and Valve seat body 7 causes fuel to escape a fuel chamber 17 of the fuel injection valve 1 into the combustion chamber of the internal combustion engine. The provision the valve needle 5 takes place in the embodiment via a Compression spring 18, which is on one side on the Base plate 15 and on the other side to the fuel inlet connector 4 supports.

Das Ventilgehäuse 3, der Brennstoffeinlaßstutzen 4, die Grundplatte 15, die zuflußseitige Dichtplatte 14 und die dichtsitzseitige Dichtplatte 16 sind mit Schweißnähten 19a - 19f aneinander befestigt. Die Befestigung kann jedoch auch auf eine andere Meise erfolgen.The valve housing 3, the fuel inlet port 4, the Base plate 15, the inflow-side sealing plate 14 and sealing plate side sealing plate 16 are welded 19a - 19f attached to each other. The attachment can also done on another tit.

An der zuflußseitigen Dichtplatte 14 und der dichtsitzseitigen Dichtplatte 16 sind ein Aktormantel 20 und eine Hülse 21 befestigt. Dabei ist der Aktormantel 20 über eine umlaufende Schweißnaht 22 mit der zuflußseitigen Dichtplatte 14 und mit einer umlaufenden Schweißnaht 23 mit der dichtsitzseitigen Dichtplatte 16 unlösbar verbunden. Die Verbindung kann jedoch auch anders, insbesondere lösbar ausgeführt sein. Die zuflußseitige Dichtplatte 14 und die dichtsitzseitige Dichtplatte 16 weisen innere Aussparungen 24, 25 auf, durch welche die Hülse 21 hindurchtritt, wobei die Hülse 21 an der zuflußseitigen Dichtplatte 14 in einem zurückgebogenen Bereich 39 aufgeweitet zurückgebogen ist und an einer umlaufenden Schweißnaht 26 mit einer Stirnfläche 37 der zuflußseitigen Dichtplatte 14 und an einer umlaufenden Schweißnaht 27 mit der dichtsitzseitigen Dichtplatte 16 verbunden ist. Die zuflußseitige Dichtplatte 14 weist einen Randbereich 38 auf, an dem die zuflußseitige Dichtplatte 14 mit der Grundplatte 15 verbunden ist. Ein zurückgebogener Bereich 39 der Hülse 21 wird dabei von dem Randbereich 38 der zuflußseitigen Dichtplatte 14 überragt. Durch die topfförmige Ausbildung der zuflußseitigen Dichtplatte 14 kann die an der zuflußseitigen Dichtplatte 14 aufgeweitete und zurückgebogene Hülse 21 bei Ausdehnung des Aktors 13 in Richtung des Brennstoffeinlaßstutzens 4 bewegt werden, wobei die Abdichtung des Aktors 13 durch die Abdichtung 14, 16, 20, 21 gegen den Brennstoff bestehen bleibt. Aus dem gleichen Grund ist der Aktormantel 20 wellenförmig bzw. gefaltet ausgebildet. Dabei kann durch den Aktormantel 20 eine Vorspannung auf den Aktor 13 übertragen werden, so daß die Druckfeder 18 entfallen kann. On the inflow-side sealing plate 14 and sealing plate-side sealing plate 16 are an actuator jacket 20 and a sleeve 21 attached. The actuator jacket 20 is over a circumferential weld 22 with the inflow side Sealing plate 14 and with a circumferential weld 23 with the sealing seat side sealing plate 16 is non-detachably connected. The However, the connection can also be different, in particular releasable be executed. The inflow-side sealing plate 14 and the sealing plate-side sealing plate 16 have inner recesses 24, 25 through which the sleeve 21 passes, wherein the sleeve 21 on the inflow-side sealing plate 14 in one bent back area 39 is bent back and on a circumferential weld seam 26 with an end face 37 the inflow-side sealing plate 14 and on a circumferential Weld seam 27 with the sealing plate 16 on the sealing seat side connected is. The inflow-side sealing plate 14 has one Edge area 38 on which the inflow-side sealing plate 14 is connected to the base plate 15. A bent back Area 39 of sleeve 21 is separated from edge area 38 the inflow-side sealing plate 14 protrudes. Through the Pot-shaped formation of the inflow-side sealing plate 14 can the expanded on the inflow-side sealing plate 14 and bent back sleeve 21 when the actuator 13 in Direction of the fuel inlet port 4 are moved, wherein the sealing of the actuator 13 by the sealing 14, 16, 20, 21 against the fuel remains. From the for the same reason, the actuator jacket 20 is wave-shaped or folded. In this case, through the actuator jacket 20 a bias voltage is transmitted to the actuator 13 so that the compression spring 18 can be omitted.

Die Zuführung von Brennstoff erfolgt über den Brennstoffeinlaßstutzen 4, durch Bohrungen 28a, 28b in der Grundplatte 15 und durch eine innere Längsöffnung 31 der Hülse 21, durch die sich auch die Ventilnadel 5 erstreckt, in die Brennstoffkammer 17. Die Leitung des Brennstoffs kann alternativ auch über den Innenraum 29 des Ventilgehäuses 3 erfolgen, wobei dann geeignete Durchflußöffnungen in der dichtsitzseitigen Dichtplatte 16 vorzusehen sind.The fuel is supplied via the Fuel inlet port 4, through holes 28a, 28b in the Base plate 15 and through an inner longitudinal opening 31 Sleeve 21, through which valve needle 5 also extends, into the fuel chamber 17. The fuel line can alternatively also via the interior 29 of the valve housing 3 take place, then suitable flow openings in the sealing plate-side sealing plate 16 are to be provided.

In einem Zwischenraum 30 zwischen dem Aktormantel 20 und dem Aktor 13 kann ein wärmeleitfähiges Material, insbesondere eine Wärmeleitpaste eingebracht sein, wodurch die Wärme des Aktors 13 über die Wärmeleitpaste im Zwischenraum 30 und über die dichtsitzseitige Dichtplatte 16 an das Ventilgehäuse 3 geleitet wird. In entsprechender Weise kann auch der Raum zwischen dem Aktor 13 und der Hülse 21 mit einer Wärmeleitpaste gefüllt sein, um Wärme an den Brennstoff abzugeben.In a space 30 between the actuator jacket 20 and the Actuator 13 can be a thermally conductive material, in particular a thermal paste can be introduced, whereby the heat of the Actuator 13 via the thermal paste in the intermediate space 30 and via the sealing seat side sealing plate 16 to the Valve housing 3 is passed. In a corresponding way also the space between the actuator 13 and the sleeve 21 with a thermal paste to apply heat to the Dispense fuel.

Fig. 2 zeigt in einer auszugsweisen axialen Schnittdarstellung ein zweites Ausführungsbeispiel des erfindungsgemäßen Brennstoffeinspritzventils 1. Bereits beschriebene Elemente sind mit übereinstimmenden Bezugszeichen versehen, so daß sich eine wiederholende Beschreibung erübrigt.Fig. 2 shows an axial excerpt Sectional view of a second embodiment of the Fuel injector according to the invention 1. Already described elements are with matching Provide reference numerals so that a repetitive Description unnecessary.

Bei dem zweiten Ausführungsbeispiel des Brennstoffeinspritzventils 1 handelt es sich um ein außenöffnendes Brennstoffeinspritzventil 1. Die topfförmige, zuflußseitige Dichtplatte 14 stützt sich am Brennstoffeinlaßstutzen 4 ab, so daß sich bei einer Betätigung des Aktors 13 dieser in Richtung des Dichtsitzes ausdehnt und über die dichtsitzseitige Dichtplatte 16 und die Grundplatte 15 auf die Ventilnadel 5 einwirkt, wodurch der kegel stumpfförmige, in Abspritzrichtung erweiternd ausgebildete Ventilschließkörper 6, der mit der Ventilnadel 5 einteilig ausgebildet ist, von der Ventilsitzfläche 8 des Ventilsitzkörpers 7 abhebt und den Dichtsitz freigibt. Über die Druckfeder 18, die sich einerseits am Ventilgehäuse 3 und andererseits an der Grundplatte 15 abstützt, wird der Ventilschließkörper 6 gegen die Ventilsitzfläche 8 des Ventilsitzkörpers 7 gepreßt. Wie schon bei dem in Fig. 1 dargestellten Ausführungsbeispiel beschrieben, kann die Funktion der Druckfeder 18 vollständig oder zum Teil von dem Aktormantel 20 übernommen werden.In the second embodiment of the fuel injector 1 is an externally opening fuel injector 1. The pot-shaped, inflow-side Sealing plate 14 is supported on the fuel inlet connection 4, so that when the actuator 13 is actuated Direction of the sealing seat and over the sealing seat side sealing plate 16 and the base plate 15 the valve needle 5 acts, whereby the truncated cone-shaped trained to expand in the spray direction Valve closing body 6, in one piece with the valve needle 5 is formed from the valve seat surface 8 of the Valve seat body 7 lifts and releases the sealing seat. about the compression spring 18, which is located on the one hand on the valve housing 3 and on the other hand is supported on the base plate 15, the Valve closing body 6 against the valve seat surface 8 of the Valve seat body 7 pressed. As with the one in FIG. 1 Described embodiment, the Function of the compression spring 18 completely or partially Actuator jacket 20 are taken over.

Die elektrische Zuleitung an den Aktor 13 kann über Zuleitungskanäle 32 und 33 im Brennstoffeinlaßstutzen 4 bzw. in der Dichtplatte 14 erfolgen. Die Zuleitungskanäle 32, 33 können auch der Entlüftung der Abdichtung 14, 16, 20, 21 oder zum Abfluß von Leckflüssigkeit aus der Abdichtung 14, 16, 20, 21 dienen. Der Zufluß von Brennstoff in Richtung des Dichtsitzes erfolgt über die Längsöffnung 31 und Bohrungen 28a, 28b in der Grundplatte 15. Wie bei dem in Fig. 1 dargestellten Ausführungsbeispiel kann in den Zwischenraum 30 zwischen dem Aktormantel 20 und dem Aktor 13 und/oder zwischen der Hülse 21 und dem Aktor 13 ein wärmeleitfähiges Material, insbesondere eine Wärmeleitpaste, eingebracht sein.The electrical lead to the actuator 13 can Supply channels 32 and 33 in the fuel inlet port 4 and take place in the sealing plate 14. The feed channels 32, 33 can also vent the seal 14, 16, 20, 21 or for the drainage of leakage liquid from the seal 14, 16, 20, 21 serve. The inflow of fuel towards the Sealing seat takes place via the longitudinal opening 31 and bores 28a, 28b in the base plate 15. As with that in FIG. 1 illustrated embodiment can in the space 30 between the actuator jacket 20 and the actuator 13 and / or between the sleeve 21 and the actuator 13 a thermally conductive Material, in particular a thermal paste, introduced his.

Fig. 3 zeigt in einer Schnittdarstellung eine weitere Ausführungsform der Abdichtung 14, 16, 20 des Aktors 13. Der Aktormantel 20 ist über umlaufende Schweißnähte 22 bzw. 23 an die zuflußseitige Dichtplatte 14 bzw. die dichtsitzseitige Dichtplatte 16 geschweißt. Der Aktor 13 befindet sich zwischen den beiden topfförmig ausgebildeten Dichtplatten 14, 16. Ein Zuleitungskanal 33 für die Aufnahme einer elektrischen Leitung an den Aktor 13 ist in der zuflußseitigen Dichtplatte 14 vorgesehen. Der Zuleitungskanal 33 kann jedoch auch in der dichtsitzseitigen Dichtplatte 16 vorgesehen sein. Bei diesem Ausführungsbeispiel wird auf die Hülse 21 verzichtet, weshalb der Aktor 13 ohne innere Längsöffnung 31 ausgebildet ist. Entsprechend erfolgt die Brennstoffzufuhr außerhalb des Aktormantels 20.Fig. 3 shows another in a sectional view Embodiment of the seal 14, 16, 20 of the actuator 13. Der Actuator jacket 20 is over circumferential weld seams 22 and 23 to the inflow-side sealing plate 14 or the sealing plate-side sealing plate 16 welded. The actuator 13 is located between the two cup-shaped Sealing plates 14, 16. A supply channel 33 for receiving an electrical line to the actuator 13 is in the inflow-side sealing plate 14 is provided. The Supply channel 33 can, however, also in the sealing seat side Sealing plate 16 may be provided. With this Embodiment is dispensed with the sleeve 21, which is why the actuator 13 is designed without an inner longitudinal opening 31 is. Accordingly, the fuel is supplied outside of the Actuator jacket 20.

Fig. 4 zeigt in einer Schnittdarstellung ein weiteres Ausführungsbeispiel der zuflußseitigen Dichtplatte 14. In diesem Ausführungsbeispiel ist der Zuleitungskanal 33 abgeknickt ausgeführt, wobei der Zuleitungskanal 33 an der Umfangsfläche 35 der zuflußseitigen Dichtplatte 14 mündet. Mit der Umfangsfläche 35 kann die zuflußseitige Dichtplatte 14 an der Innenwand des Ventilgehäuses 3, insbesondere durch Schweißen, befestigt werden. Dadurch kann die elektrische Leitung über einen Anschluß, der in dem Ventilgehäuse 3 vorzusehen ist, von der Seite des Brennstoffeinspritzventils 1 durch den Zuleitungskanal 33 zum Aktor 13 geführt werden. Die Öffnung des Zuleitungskanals 33 an der Umfangsfläche 35 ist, um das Eindringen von Brennstoff zu verhindern, gegen den Brennstoff abzudichten. Dafür eignet sich insbesondere eine um die Öffnung laufende Schweißnaht zwischen der Umfangsfläche 35 und dem Ventilgehäuse 3. Die Befestigung des Aktormantels 20 kann an einer einen geringeren Durchmesser als die obere Umfangsfläche 35 aufweisenden unteren Umfangsfläche 36 der zuflußseitigen Dichtplatte 14 erfolgen. Ohne Einschränkung eignet sich die beschriebene Ausführung der zuflußseitigen Dichtplatte 14 auch für die dichtsitzseitige Dichtplatte 16.Fig. 4 shows another in a sectional view Embodiment of the inflow-side sealing plate 14. In In this exemplary embodiment, the feed channel 33 executed kinked, the supply channel 33 on the Circumferential surface 35 of the inflow-side sealing plate 14 opens. With the peripheral surface 35, the inflow-side sealing plate 14 on the inner wall of the valve housing 3, in particular by Welding. This allows the electrical Line via a connection in the valve housing 3 is to be provided from the side of the fuel injector 1 through the feed channel 33 to the actuator 13. The opening of the feed channel 33 on the peripheral surface 35 is to prevent the ingress of fuel to seal the fuel. This is particularly suitable a weld seam running around the opening between the Circumferential surface 35 and the valve housing 3. The attachment of the actuator jacket 20 can be a smaller one Diameter than the upper peripheral surface 35 having lower peripheral surface 36 of the inflow-side sealing plate 14 respectively. The one described is suitable without restriction Execution of the inflow-side sealing plate 14 also for the sealing plate side sealing plate 16.

Um in dem in Fig. 4 dargestellten Ausführungsbeispiel die Brennstoffzufuhr zu ermöglichen, weist die Dichtplatte 14 einen Brennstoffkanal 40 auf. Alternativ ist es möglich, die Dichtplatte 14 entsprechend der Fig. 1 mit einer Aussparung 24 zu versehen.To the in the embodiment shown in Fig. 4 The sealing plate 14 has the possibility of supplying fuel a fuel channel 40. Alternatively, it is possible to use the Sealing plate 14 according to FIG. 1 with a recess 24 to be provided.

Die Erfindung ist nicht auf die beschriebenen Ausführungsbeispiele beschränkt. Insbesondere ist eine andere Gestaltung des Aktormantels 20, der Hülse 21, insbesondere des zurückgebogenen Bereichs 39 der Hülse 21, und der beiden Dichtplatten 14, 16 denkbar. Des weiteren ist die Einwirkung des Aktors 13 auf die Ventilnadel 5 in den Fig. 1 und 2 vereinfacht dargestellt und soll die Erfindung nicht in dieser Hinsicht einschränken. Insbesondere zeichnet sich die Erfindung durch die Möglichkeit der Verwendung der Abdichtung 14, 16, 20, 21 in einer Vielzahl von Brennstoffeinspritzventilen 1 aus.The invention is not based on those described Embodiments limited. One is in particular different design of the actuator jacket 20, the sleeve 21, in particular the bent-back region 39 of the sleeve 21, and the two sealing plates 14, 16 conceivable. Furthermore is the action of the actuator 13 on the valve needle 5 in the 1 and 2 are shown in simplified form and are intended to illustrate the invention do not restrict in this regard. Especially draws the invention through the possibility of using the Seal 14, 16, 20, 21 in a variety of fuel injectors 1 off.

Claims (17)

  1. Fuel injection valve (1), in particular injection valve for fuel injection systems of internal combustion engines, with a fuel inlet (4) for the supply of fuel, with a piezoelectic or magnetostrictive actuator (13) which is sealed off relative to the fuel by means of a seal (14, 16, 20, 21), and with a valve-closing body (6) which is capable of being actuated by the actuator (13) by means of a valve needle (5) and which cooperates with a valve-seat surface 8) to form a sealing seat, characterized in that the seal (14, 16, 20, 21) comprises an inflow-side sealing plate (14) and the actuator casing (20) which is deformable elastically in the longitudinal direction and which is connected to the inflow-side sealing plate (4).
  2. Fuel injection valve according to Claim 1, characterized in that the inflow-side sealing plate (14) has a bowl-shaped design.
  3. Fuel injection valve according to one of Claims 1 and 2, characterized in that the actuator casing (20) has a wavy or folded design.
  4. Fuel injection valve according to one of Claims 1 to 3, characterized in that actuator (13) is subjected to a prestressing force by the actuator casing (20).
  5. Fuel injection valve according to one of Claims 1 to 4, characterized in that a thermally conductive material, in particular a thermally conductive paste, is provided between the actuator casing (20) and the actuator (13).
  6. Fuel injection valve according to one of Claims 1 to 5, characterized in that the actuator (13) has an inner longitudinal orifice (31).
  7. Fuel injection valve according to Claim 6, characterized in that the seal (14, 16, 20, 21) has a tubular sleeve (21) which passes through the Iongitudinal orifice (31) of the actuator (13) and which is surrounded at least in portions by the actuator (13).
  8. Fuel injection valve according to one of Claims 1 to 7, characterized in that the seal (14, 16, 20, 21) comprises a sealing plate (16) which is located on the sealing-seat side and which is connected to the actuator casing (20) and/or to the sleeve (21).
  9. Fuel injection valve according to Claim 8, characterized in that the sealing plate (16) located on the sealing-seat side has a bowl-shaped design.
  10. Fuel injection valve according to Claim 8 or 9, characterized in that the sealing plates (14, 16) each have a clearance (24, 25), through which the sleeve (21) passes, and in that the sleeve (21) is bent back, widened, at at least one sealing plate (14) and is connected to the sealing plate (14) on an end face (37) facing away from the other sealing plate (16) in each case.
  11. Fuel injection valve according to one of Claims 8 to 10, characterized in that at least of the sealing plates (14, 16) has a bowl-shaped design, and an edge region (38) of the sealing plate (14) projects above the bent-back region (39) of the sleeve (21).
  12. Fuel injection valve according to one of Claims 1 to 11, characterized in that the inflow-side sealing plate (14) has at least one feed duct (33), through which at least one electrical feed line is guided to the actuator (13).
  13. Fuel injection valve according to Claim 12, characterized in that the feed duct (33) is sealed off relative to the fuel.
  14. Fuel injection valve according to one of Claims 1 to 13, characterized in that the actuator (13) acts on the valve needle (5) via the inflow-side
  15. Fuel injection valve according to one of Claims 7 to 14, characterized in that the valve needle (5) is surrounded in portions by the sleeve (21).
  16. Fuel injection valve according to one of Claims 8 to 11, characterized in that the actuator (13) acts on the valve needle (5) via the sealing, plate (16) located on the sealing-seat side.
  17. Fuel injection valve according to one of Claims 7 to 16, characterized in that the sleeve (21) is part of a fuel line extending from the fuel inlet (4) as far as the sealing seat.
EP99957921A 1999-03-20 1999-10-20 Fuel injection valve Expired - Lifetime EP1080305B2 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19912666A DE19912666A1 (en) 1999-03-20 1999-03-20 Fuel injector
DE19912666 1999-03-20
PCT/DE1999/003357 WO2000057049A1 (en) 1999-03-20 1999-10-20 Fuel injection valve

Publications (3)

Publication Number Publication Date
EP1080305A1 EP1080305A1 (en) 2001-03-07
EP1080305B1 true EP1080305B1 (en) 2002-07-31
EP1080305B2 EP1080305B2 (en) 2012-04-25

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Family Applications (1)

Application Number Title Priority Date Filing Date
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Country Link
US (2) US6435430B1 (en)
EP (1) EP1080305B2 (en)
JP (1) JP4469506B2 (en)
KR (1) KR100658955B1 (en)
DE (2) DE19912666A1 (en)
WO (1) WO2000057049A1 (en)

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DE19912666A1 (en) 2000-09-21
JP2002540341A (en) 2002-11-26
EP1080305A1 (en) 2001-03-07
JP4469506B2 (en) 2010-05-26
KR100658955B1 (en) 2006-12-19
KR20010025057A (en) 2001-03-26
US20030015601A1 (en) 2003-01-23
DE59902197D1 (en) 2002-09-05
US6435430B1 (en) 2002-08-20
US6889913B2 (en) 2005-05-10
WO2000057049A1 (en) 2000-09-28
EP1080305B2 (en) 2012-04-25

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