EP1080305B2 - Fuel injection valve - Google Patents

Fuel injection valve Download PDF

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Publication number
EP1080305B2
EP1080305B2 EP99957921A EP99957921A EP1080305B2 EP 1080305 B2 EP1080305 B2 EP 1080305B2 EP 99957921 A EP99957921 A EP 99957921A EP 99957921 A EP99957921 A EP 99957921A EP 1080305 B2 EP1080305 B2 EP 1080305B2
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EP
European Patent Office
Prior art keywords
actuator
fuel injection
injection valve
fuel
sealing plate
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
EP1080305B1 (en
Inventor
Wolfgang Ruehle
Hubert Stier
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Robert Bosch GmbH
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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 relates to a fuel injection valve according to the preamble of claim 1.
  • a fuel injection valve according to the preamble of claim 1 is known.
  • the resulting from this document fuel injector consists of a valve body in which a valve needle is guided coaxially.
  • the valve body has a connection via which fuel is supplied to the fuel injection valve.
  • the valve needle is provided with a central bore.
  • the valve needle forms a sealing seat with the valve body.
  • the fuel is directed via the central bore of the valve needle to the sealing seat.
  • the valve needle On its outside, the valve needle is sealed against the surrounding valve body.
  • a piezoelectric actuator acts on the valve needle via a pressure shoulder.
  • the pressure shoulder is firmly connected to the valve needle and is guided on the inlet side close to the valve body. This protects the actuator against the effect of fuel pressure.
  • the known fuel injection valve the following disadvantages arise:
  • valve needle Since the valve needle is firmly connected to the pressure shoulder, the valve needle discharge side and the pressure shoulder inlet side are sealingly and movably guided in the valve body, the production is relatively complex and the fuel injector prone to bending or distortion of the valve needle or the change in the relative positions of the two sliding surfaces ,
  • the pressure shoulder or the valve needle Since the pressure shoulder or the valve needle is movably guided against the valve body, it comes to a wetting of the sealing surface with fuel and because of the high fuel pressure to an influx of fuel in the direction of the actuator. Thus, the actuator is only protected against the action of the fuel pressure but not against the action of the fuel. Due to the seal between the pressure shoulder or nozzle needle and the nozzle body, friction losses occur when the fuel injection valve is actuated. Thereby, the moldability of the fuel jet is deteriorated, the switching times of the valve increase, the actuator energy can be exploited worse, and there is an increased wear of the fuel injection valve. In particular, in the course of operation, there is a decreasing tightness of the sealing surfaces formed between the pressure shoulder or the nozzle needle and the nozzle body.
  • valve needle Since the central bore in the valve needle is part of a fuel line extending from the fuel inlet port to the sealing seat, the manufacture of the valve needle is expensive and the fuel injector is particularly susceptible to soiling at its sealing seat end.
  • the fuel injection valve according to the invention with the features of claim 1 has the advantage that results in a low-cost, low-wear, frictionless and significantly more compact design by a simple solution. Furthermore, the seal is independent of the design of the valve needle and thus can be integrated into a plurality of fuel injection valves.
  • the sealed in this way with the seal against the fuel actuator can be integrated without major structural changes in both an inwardly opening and in an outwardly opening fuel injection valve.
  • the actuator is protected by the seal both against the action of the fuel and against the action of the fuel pressure.
  • the actuator jacket is formed wavy or folded. This allows a large actuator stroke in the actuator housing in a compact design.
  • the actuator is acted upon by the actuator shell with a biasing force. Additional components, such. B. springs, can be omitted.
  • a thermally conductive material in particular a thermal compound, is provided between the actuator casing and the actuator. As a result, the energy which is produced during actuation of the actuator and dissipated in the actuator can be forwarded from the actuator to the thermally conductive material and from there to the actuator housing. This reduces the thermal load on the actuator and extends the life of the fuel injector.
  • the seal on a tubular sleeve which penetrates the recess of the actuator and which is at least partially enclosed by the actuator.
  • the interior of the tubular sleeve is sealed against the actuator and thus can be traversed by the fuel.
  • the seal on a sealing seat side sealing plate which is connected to the actuator shell and / or with the sleeve.
  • the actuator can act via the sealing seat-side sealing plate on devices of the fuel injection valve or be supported on these.
  • the sealing seat side sealing plate can be designed similar to the inflow side sealing plate, whereby the production of the seal is simplified.
  • the sealing plates are pot-shaped, whereby means of the fuel injection valve can be accommodated in the interior of the sealing plates.
  • the sealing plates can thereby be easily guided in a guide.
  • each sealing plate respectively a recess through which the sleeve passes.
  • the sleeve is bent back on at least one sealing plate and connected to one of the respective other sealing plate facing away from the end face with this sealing plate. This allows a large actuator stroke in the actuator housing.
  • At least one of the sealing plates is cup-shaped, and an edge region of the sealing plate projects beyond the bent-back region of the sleeve. As a result, the bent-back portion of the sleeve is protected.
  • the inlet-side sealing plate has at least one supply duct, through which at least one electrical supply line is led to the actuator.
  • the electrical supply line is guided in a simple manner in the interior of the seal.
  • the supply channel is sealed against the fuel.
  • the sealing of the electrical supply line against the fuel is integrated into the sealing plate, whereby an additional seal can be omitted and results in a more compact design.
  • the sleeve is part of a fuel line extending from the fuel inlet port to the sealing seat.
  • the fuel line is simplified in particular for a terminal attached fuel port.
  • an additional fuel line can be omitted, which can save components.
  • Fig. 1 shows in a partial axial sectional view of an inventive fuel injector 1.
  • the fuel injector 1 is used in particular for direct injection of fuel, in particular gasoline in a combustion chamber of a mixture-compressing, spark-ignited internal combustion engine as a so-called gasoline direct injection valve.
  • the fuel injection valve 1 according to the invention is also suitable for other applications.
  • the fuel injection valve 1 is designed as an inwardly opening fuel injection valve 1.
  • the fuel injection valve 1 has a valve housing 3 and a fuel inlet port 4 representing the fuel inlet, which together form the housing of the fuel injection valve 1.
  • a valve needle 5 valve closing body 6, which is formed in one piece in the illustrated embodiment with the valve needle 5.
  • the valve closure member 6 is frusto-conically tapered in Abspritzides.
  • the valve closing body 6 cooperates with a formed on a valve seat body 7 valve seat surface 8 to a sealing seat.
  • the valve needle 5 is guided in its axial movement by valve needle guides 9, 10, which are fastened to the valve housing 3.
  • the valve needle guides 9, 10 have slot-shaped recesses 11, 12.
  • an actuator 13 which is designed piezoelectric or magnetostrictive.
  • the actuation of the actuator 13 via an electrical control signal, which is guided over an electrical supply line, which is not shown in this embodiment for the sake of simplicity, to the actuator 13.
  • this expands and acts via an inflow-side sealing plate 14 on a base plate 15 to which the valve needle 5 is fixed, wherein the actuator 13 is supported on the valve housing 3 via a sealing seat-side sealing plate 16.
  • Characterized the valve needle 5 is moved in the axial direction of the fuel inlet port 4, whereby the valve closing body 6 lifts from the valve seat surface 8 of the valve seat body 7 and releases the sealing seat.
  • valve needle 5 is carried out in the embodiment via a compression spring 18, which is supported on one side on the base plate 15 and on the other side of the fuel inlet 4.
  • valve housing 3 The valve housing 3, the fuel inlet port 4, the base plate 15, the inflow-side sealing plate 14 and the sealing seat-side sealing plate 16 are secured to each other with welds 19a-19f.
  • the attachment can also be done on another titmouse.
  • an actuator shell 20 and a sleeve 21 are attached at the inflow side sealing plate 14 and the sealing seat side sealing plate 16.
  • the actuator jacket 20 permanently connected via a peripheral weld 22 with the inflow-side sealing plate 14 and a circumferential weld 23 with the sealing seat side sealing plate 16.
  • the connection can also be designed differently, in particular detachable.
  • the inflow-side sealing plate 14 and the sealing seat-side sealing plate 16 have inner recesses 24, 25, through which the sleeve 21 passes, the sleeve 21 is bent back at the inflow-side sealing plate 14 in a bent-back region 39 and at a circumferential weld 26 with an end face 37 of the inflow-side sealing plate 14 and is connected to a circumferential weld 27 with the sealing seat side sealing plate 16.
  • the inflow-side sealing plate 14 has an edge region 38, on which the inflow-side sealing plate 14 is connected to the base plate 15. A bent-back region 39 of the sleeve 21 is thereby surmounted by the edge region 38 of the inflow-side sealing plate 14.
  • the expanded on the inflow-side sealing plate 14 and bent back sleeve 21 can be moved in extension of the actuator 13 in the direction of the Brennscherinlönstutzens 4, wherein the sealing of the actuator 13 through the seal 14, 16, 20, 21 against the fuel remains.
  • the actuator shell 20 is formed wavy or folded. In this case, a bias voltage can be transmitted to the actuator 13 by the actuator shell 20, so that the compression spring 18 can be omitted.
  • the conduit of the fuel may alternatively take place via the interior 29 of the valve housing 3, in which case suitable flow openings are provided in the sealing seat side sealing plate 16.
  • a thermally conductive material in particular a thermal paste may be introduced, whereby the heat of the actuator 13 is passed through the thermal paste in the intermediate space 30 and the sealing seat side sealing plate 16 to the valve housing 3.
  • the space between the actuator 13 and the sleeve 21 may be filled with a thermal grease to give off heat to the fuel.
  • Fig. 2 shows in a partial axial sectional view of a second embodiment of the fuel injection valve according to the invention 1. Already described elements are provided with matching reference numerals, so that a repetitive description is unnecessary.
  • the cup-shaped, inflow-side sealing plate 14 is supported on the fuel inlet stub 4, so that when actuated the actuator 13 expands in the direction of the sealing seat and via the sealing seat-side sealing plate 16 and the base plate 15 acts on the valve needle 5, whereby the truncated cone, widening in Abspritzcardi valve closing body 6, which is integrally formed with the valve needle 5, lifts off from the valve seat 8 of the valve seat body 7 and releases the sealing seat.
  • the compression spring 18 which is supported on the one hand on the valve housing 3 and on the other hand on the base plate 15, the valve closing body 6 is pressed against the valve seat surface 8 of the valve seat body 7.
  • the function of the compression spring 18 can be completely or partially taken over by the actuator shell 20.
  • the electrical supply to the actuator 13 can be made via supply channels 32 and 33 in the fuel inlet 4 and in the sealing plate 14.
  • the supply channels 32, 33 can also serve for venting the seal 14, 16, 20, 21 or for drainage of leakage from the seal 14, 16, 20, 21.
  • a thermally conductive material in particular a thermal paste.
  • Fig. 3 shows a sectional view of a further embodiment of the seal 14, 16, 20 of the actuator 13.
  • the actuator shell 20 is welded via circumferential welds 22 and 23 to the inflow-side sealing plate 14 and the sealing seat side sealing plate 16.
  • the actuator 13 is located between the two cup-shaped sealing plates 14, 16.
  • a feed channel 33 for receiving an electrical line to the actuator 13 is provided in the inflow-side sealing plate 14.
  • the supply passage 33 may also be provided in the sealing seat side sealing plate 16.
  • the sleeve 21 is dispensed with, which is why the actuator 13 is formed without an inner longitudinal opening 31. Accordingly, the fuel supply is outside the actuator shell 20th
  • Fig. 4 shows in a sectional view of another embodiment of the inflow-side sealing plate 14.
  • the feed channel 33 is designed kinked, wherein the feed channel 33 opens on the peripheral surface 35 of the inflow-side sealing plate 14.
  • 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, are attached.
  • the opening of the supply passage 33 on the circumferential surface 35 is to prevent the penetration of fuel to seal against the fuel.
  • a weld running around the opening between the peripheral surface 35 and the valve housing 3 is suitable for this purpose.
  • the actuator shell 20 can be fastened to a lower circumferential surface 36 of the inflow-side sealing plate 14 having a smaller diameter than the upper peripheral surface 35.
  • the described embodiment of the inflow side sealing plate 14 is also suitable for the sealing seat side sealing plate 16th
  • the sealing plate 14 has a fuel passage 40.
  • the sealing plate 14 according to the Fig. 1 to provide with a recess 24.
  • the invention is not limited to the described embodiments.
  • another design of the actuator shell 20, the sleeve 21, in particular the bent-back portion 39 of the sleeve 21, and the two sealing plates 14, 16 is conceivable.
  • the action of the actuator 13 on the valve needle 5 in the Fig. 1 and 2 shown simplified and is not intended to limit the invention in this regard.
  • the invention is characterized by the possibility of using the seal 14, 16, 20, 21 in a plurality of fuel injection valves 1.

Abstract

The invention relates to a fuel injection valve (1), especially an injection valve for fuel injection systems, comprising a fuel admission tube (4) for supplying fuel, a piezoelectric or magnetostrictive actuator (13), which is sealed against the fuel by a sealing (14, 16, 20, 21), in addition to a valve closing body (6) actuated by the actuator (13) by means of a valve needle (5) and cooperating with a valve seat surface (8) to form a sealing seat. The sealing (14, 16, 20, 21) has a sealing plate (14) on the admission side, which is mounted between the fuel admission pipe (4) and the actuator (13) and an actuator casing (20) that is elastically deformable in longitudinal direction and that is connected to the sealing plate (14) on the admission side.

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einem Brennstoffeinspritzventil nach der Gattung des Anspruchs 1.The invention relates to a fuel injection valve 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:From the DE 195 34 445 C2 a fuel injection valve according to the preamble of claim 1 is known. The resulting from this document fuel injector consists of a valve body in which a valve needle is guided coaxially. The valve body has a connection via which fuel is supplied to the fuel injection valve. The valve needle is provided with a central bore. At the discharge side, the valve needle forms a sealing seat with the valve body. The fuel is directed via the central bore of the valve needle to the sealing seat. On its outside, the valve needle is sealed against the surrounding valve body. A piezoelectric actuator acts on the valve needle via a pressure shoulder. The pressure shoulder is firmly connected to the valve needle and is guided on the inlet side close to the valve body. This protects the actuator against the effect of fuel pressure. In the known fuel injection valve, the following disadvantages arise:

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 discharge side and the pressure shoulder inlet side are sealingly and movably guided in the valve body, the production is relatively complex and the fuel injector prone to bending or distortion of the valve needle or the change in the 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 is movably guided against the valve body, it comes to a wetting of the sealing surface with fuel and because of the high fuel pressure to an influx of fuel in the direction of the actuator. Thus, the actuator is only protected against the action of the fuel pressure but not against the action of the fuel. Due to the seal between the pressure shoulder or nozzle needle and the nozzle body, friction losses occur when the fuel injection valve is actuated. Thereby, the moldability of the fuel jet is deteriorated, the switching times of the valve increase, the actuator energy can be exploited worse, and there is an increased wear of the fuel injection valve. In particular, in the course of operation, there is a decreasing tightness of the sealing surfaces formed between the pressure shoulder or the nozzle needle and the nozzle body.

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 fuel line extending from the fuel inlet port to the sealing seat, the manufacture of the valve needle is expensive and the fuel injector is particularly susceptible to soiling at its sealing seat end.

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 injection valve according to the invention with the features of claim 1 has the advantage that results in a low-cost, low-wear, frictionless and significantly more compact design by a simple solution. Furthermore, the seal is independent of the design of the valve needle and thus can be integrated into a plurality of fuel injection valves.

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.In addition, the sealed in this way with the seal against the fuel actuator can be integrated without major structural changes in both an inwardly opening and in an outwardly opening fuel injection valve. In addition, the actuator is protected by the seal both against the action of the fuel and against the action of the fuel pressure.

Durch die in den abhängigen Ansprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen des im Anspruch 1 angegebenen Brennstoffeinspritzventils möglich.The measures listed in the dependent claims advantageous developments of the fuel injection valve specified in claim 1 are 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.Advantageously, the actuator jacket is formed wavy or folded. This allows a large actuator stroke in the actuator housing in a compact design. Advantageously, the actuator is acted upon by the actuator shell with a biasing force. Additional components, such. B. springs, can be omitted. In an advantageous manner, a thermally conductive material, in particular a thermal compound, is provided between the actuator casing and the actuator. As a result, the energy which is produced during actuation of the actuator and dissipated in the actuator can be forwarded from the actuator to the thermally conductive material and from there to the actuator housing. This reduces the thermal load on the actuator and extends the life of the fuel injector.

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.Advantageously, the seal on a tubular sleeve which penetrates the recess of the actuator and which is at least partially enclosed by the actuator. As a result, the interior of the tubular sleeve is sealed against the actuator and thus can be traversed by the fuel.

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.Advantageously, the seal on a sealing seat side sealing plate, which is connected to the actuator shell and / or with the sleeve. As a result, the actuator can act via the sealing seat-side sealing plate on devices of the fuel injection valve or be supported on these. In addition, the sealing seat side sealing plate can be designed similar to the inflow side sealing plate, whereby the production of the seal is simplified.

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.Advantageously, the sealing plates are pot-shaped, whereby means of the fuel injection valve can be accommodated in the interior of the sealing plates. In addition, the sealing plates can thereby be easily guided in a guide.

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.Advantageously, each sealing plate respectively a recess through which the sleeve passes. In this case, the sleeve is bent back on at least one sealing plate and connected to one of the respective other sealing plate facing away from the end face with this sealing plate. This allows 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.Advantageously, at least one of the sealing plates is cup-shaped, and an edge region of the sealing plate projects beyond the bent-back region of the sleeve. As a result, the bent-back portion of the sleeve is protected.

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.In an advantageous manner, the inlet-side sealing plate has at least one supply duct, through which at least one electrical supply line is led to the actuator. As a result, the electrical supply line is guided in a simple manner in the interior of the seal.

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.Advantageously, the supply channel is sealed against the fuel. As a result, the sealing of the electrical supply line against the fuel is integrated into the sealing plate, whereby an additional seal can be omitted 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 fuel line extending from the fuel inlet port to the sealing seat. As a result, the fuel line is simplified in particular for a terminal attached fuel port. In addition, an additional fuel line can be omitted, which can save components.

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
a partial axial section through a first embodiment of a fuel injection valve according to the invention, wherein the fuel injection valve is designed to open inwardly;
Fig. 2
a partial axial section through a second embodiment of a fuel injection valve according to the invention, wherein the fuel injection valve is designed to open outwardly;
Fig. 3
an axial section through an actuator with 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 in a partial axial sectional view of an inventive fuel injector 1. The fuel injector 1 is used in particular for direct injection of fuel, in particular gasoline in a combustion chamber of a mixture-compressing, spark-ignited internal combustion engine as a so-called gasoline direct injection valve. However, the fuel injection valve 1 according to the invention is also suitable 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 injection valve 1 is designed as an inwardly opening fuel injection valve 1. The fuel injection valve 1 has a valve housing 3 and a fuel inlet port 4 representing the fuel inlet, which together form the housing of the fuel injection valve 1. In the valve housing 3 there is an actuatable by means of a valve needle 5 valve closing body 6, which is formed in one piece in the illustrated embodiment with the valve needle 5. The valve closure member 6 is frusto-conically tapered in Abspritzrichtung. The valve closing body 6 cooperates with a formed on a valve seat body 7 valve seat surface 8 to a sealing seat. The valve needle 5 is guided in its axial movement by valve needle guides 9, 10, which are fastened to the valve housing 3. In order to allow the passage of fuel, the valve needle guides 9, 10 have 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.To actuate the fuel injection valve 1, an actuator 13 is used, which is designed piezoelectric or magnetostrictive. The actuation of the actuator 13 via an electrical control signal, which is guided over an electrical supply line, which is not shown in this embodiment for the sake of simplicity, to the actuator 13. Upon actuation of the actuator 13, this expands and acts via an inflow-side sealing plate 14 on a base plate 15 to which the valve needle 5 is fixed, wherein the actuator 13 is supported on the valve housing 3 via a sealing seat-side sealing plate 16. Characterized the valve needle 5 is moved in the axial direction of the fuel inlet port 4, whereby the valve closing body 6 lifts from the valve seat surface 8 of the valve seat body 7 and releases the sealing seat. Due to the resulting gap between the valve closing body 6 and valve seat body 7, there is the escape of fuel from a fuel chamber 17 of the fuel injection valve 1 in the combustion chamber of the internal combustion engine. The provision of the valve needle 5 is carried out in the embodiment via a compression spring 18, which is supported on one side on the base plate 15 and on the other side of the fuel inlet 4.

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 the sealing seat-side sealing plate 16 are secured to each other with welds 19a-19f. However, the attachment can also be done on another titmouse.

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.At the inflow side sealing plate 14 and the sealing seat side sealing plate 16, an actuator shell 20 and a sleeve 21 are attached. Here is the actuator jacket 20 permanently connected via a peripheral weld 22 with the inflow-side sealing plate 14 and a circumferential weld 23 with the sealing seat side sealing plate 16. However, the connection can also be designed differently, in particular detachable. The inflow-side sealing plate 14 and the sealing seat-side sealing plate 16 have inner recesses 24, 25, through which the sleeve 21 passes, the sleeve 21 is bent back at the inflow-side sealing plate 14 in a bent-back region 39 and at a circumferential weld 26 with an end face 37 of the inflow-side sealing plate 14 and is connected to a circumferential weld 27 with the sealing seat side sealing plate 16. The inflow-side sealing plate 14 has an edge region 38, on which the inflow-side sealing plate 14 is connected to the base plate 15. A bent-back region 39 of the sleeve 21 is thereby surmounted by the edge region 38 of the inflow-side sealing plate 14. Due to the cup-shaped design of the inflow-side sealing plate 14, the expanded on the inflow-side sealing plate 14 and bent back sleeve 21 can be moved in extension of the actuator 13 in the direction of the Brennstoffeinlaßstutzens 4, wherein the sealing of the actuator 13 through the seal 14, 16, 20, 21 against the fuel remains. For the same reason, the actuator shell 20 is formed wavy or folded. In this case, a bias voltage can be transmitted to the actuator 13 by the actuator shell 20, 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 supply of fuel via the fuel inlet 4, through holes 28a, 28b in the base plate 15 and through an inner longitudinal opening 31 of the sleeve 21, through which also extends the valve needle 5, in the fuel chamber 17. The conduit of the fuel may alternatively take place via the interior 29 of the valve housing 3, in which case suitable flow openings are provided in the sealing seat side sealing plate 16.

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 gap 30 between the actuator casing 20 and the actuator 13, a thermally conductive material, in particular a thermal paste may be introduced, whereby the heat of the actuator 13 is passed through the thermal paste in the intermediate space 30 and the sealing seat side sealing plate 16 to the valve housing 3. Similarly, the space between the actuator 13 and the sleeve 21 may be filled with a thermal grease to give off heat to the 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 in a partial axial sectional view of a second embodiment of the fuel injection valve according to the invention 1. Already described elements are provided with matching reference numerals, so that a repetitive description is 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.The cup-shaped, inflow-side sealing plate 14 is supported on the fuel inlet stub 4, so that when actuated the actuator 13 expands in the direction of the sealing seat and via the sealing seat-side sealing plate 16 and the base plate 15 acts on the valve needle 5, whereby the truncated cone, widening in Abspritzrichtung valve closing body 6, which is integrally formed with the valve needle 5, lifts off from the valve seat 8 of the valve seat body 7 and releases the sealing seat. Via the compression spring 18, which is supported on the one hand on the valve housing 3 and on the other hand on the base plate 15, the valve closing body 6 is pressed against the valve seat surface 8 of the valve seat body 7. As with the in Fig. 1 described embodiment, the function of the compression spring 18 can be completely or partially taken over by the actuator shell 20.

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 supply to the actuator 13 can be made via supply channels 32 and 33 in the fuel inlet 4 and in the sealing plate 14. The supply channels 32, 33 can also serve for venting the seal 14, 16, 20, 21 or for drainage of leakage from the seal 14, 16, 20, 21. The inflow of fuel in the direction of the sealing seat via the longitudinal opening 31 and holes 28a, 28b in the base plate 15. As in the in Fig. 1 illustrated embodiment may be introduced into the gap 30 between the actuator shell 20 and the actuator 13 and / or between the sleeve 21 and the actuator 13, a thermally conductive material, in particular a thermal paste.

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 a sectional view of a further embodiment of the seal 14, 16, 20 of the actuator 13. The actuator shell 20 is welded via circumferential welds 22 and 23 to the inflow-side sealing plate 14 and the sealing seat side sealing plate 16. The actuator 13 is located between the two cup-shaped sealing plates 14, 16. A feed channel 33 for receiving an electrical line to the actuator 13 is provided in the inflow-side sealing plate 14. However, the supply passage 33 may also be provided in the sealing seat side sealing plate 16. In this embodiment, the sleeve 21 is dispensed with, which is why the actuator 13 is formed without an inner longitudinal opening 31. Accordingly, the fuel supply is outside the actuator shell 20th

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 in a sectional view of another embodiment of the inflow-side sealing plate 14. In this embodiment, the feed channel 33 is designed kinked, wherein the feed channel 33 opens on the peripheral surface 35 of 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, are attached. Thereby, the electrical conduction via a terminal to be provided in the valve housing 3, guided from the side of the fuel injection valve 1 through the supply passage 33 to the actuator 13 become. The opening of the supply passage 33 on the circumferential surface 35 is to prevent the penetration of fuel to seal against the fuel. In particular, a weld running around the opening between the peripheral surface 35 and the valve housing 3 is suitable for this purpose. The actuator shell 20 can be fastened to a lower circumferential surface 36 of the inflow-side sealing plate 14 having a smaller diameter than the upper peripheral surface 35. Without limitation, the described embodiment of the inflow side sealing plate 14 is also suitable for the sealing seat side sealing plate 16th

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 be in the in Fig. 4 illustrated embodiment to allow the fuel supply, the sealing plate 14 has a fuel passage 40. Alternatively, it is possible, the sealing plate 14 according to the Fig. 1 to provide with a recess 24.

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 limited to the described embodiments. In particular, another design of the actuator shell 20, the sleeve 21, in particular the bent-back portion 39 of the sleeve 21, and the two sealing plates 14, 16 is conceivable. Furthermore, the action of the actuator 13 on the valve needle 5 in the Fig. 1 and 2 shown simplified and is not intended to limit the invention in this regard. In particular, the invention is characterized by the possibility of using the seal 14, 16, 20, 21 in a plurality of fuel injection valves 1.

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), which is arranged between the fuel inlet (4) and the actuator (13), and an actuator casing (20) which is deformable elastically in the longitudinal direction, is connected to the inflow-side sealing plate (14) and is spaced apart from the actuator (13) by an interspace (30).
  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 longitudinal 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 one 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 sealing plate (14).
  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 EP1080305B1 (en) 2002-07-31
EP1080305B2 true EP1080305B2 (en) 2012-04-25

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP99957921A Expired - Lifetime EP1080305B2 (en) 1999-03-20 1999-10-20 Fuel injection valve

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US (2) US6435430B1 (en)
EP (1) EP1080305B2 (en)
JP (1) JP4469506B2 (en)
KR (1) KR100658955B1 (en)
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US20030015601A1 (en) 2003-01-23
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DE59902197D1 (en) 2002-09-05
JP2002540341A (en) 2002-11-26
EP1080305A1 (en) 2001-03-07
WO2000057049A1 (en) 2000-09-28
KR100658955B1 (en) 2006-12-19
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JP4469506B2 (en) 2010-05-26
EP1080305B1 (en) 2002-07-31

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