EP1431568B1 - Fuel injection valve - Google Patents

Fuel injection valve Download PDF

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Publication number
EP1431568B1
EP1431568B1 EP20030015164 EP03015164A EP1431568B1 EP 1431568 B1 EP1431568 B1 EP 1431568B1 EP 20030015164 EP20030015164 EP 20030015164 EP 03015164 A EP03015164 A EP 03015164A EP 1431568 B1 EP1431568 B1 EP 1431568B1
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EP
European Patent Office
Prior art keywords
actuator
fuel injection
injection valve
actuator housing
heat
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
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EP20030015164
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German (de)
French (fr)
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EP1431568A3 (en
EP1431568A2 (en
Inventor
Uwe Liskow
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication date
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Publication of EP1431568A2 publication Critical patent/EP1431568A2/en
Publication of EP1431568A3 publication Critical patent/EP1431568A3/en
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Publication of EP1431568B1 publication Critical patent/EP1431568B1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • 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
    • 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
    • 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

Definitions

  • the invention relates to a fuel injection valve according to the preamble of the main claim.
  • a fuel injection valve with a piezoelectric actuator which is connected via a confirmation strand in operative connection with a valve closing body.
  • a belonging to a confirmation strand valve needle has at its discharge end the valve closing body, which cooperates with a valve seat surface to a sealing seat.
  • the actuator is arranged in an upper housing part.
  • a flexible portion in the form of a spring membrane hermetically seals the upper housing member against a fuel-filled lower housing member. The flexible portion is on the one hand circumferentially hermetically sealed to a Aktorpin belonging to the confirmation strand and on the other hand to the inner surfaces of the lower housing part.
  • a metering valve for metering a pressurized metering fluid which has a valve chamber with a valve housing for receiving a valve needle.
  • the valve needle is connected to an actuator and is moved over this.
  • the actuator has a piezoelectric actuator which is arranged in an actuator chamber bounded by a housing, wherein the piezoelectric actuator has at least one actuator stack and the actuator stack is clamped with its end faces between a cover element and a bottom element and wherein the actuator stack of a provided in the actuator chamber hydraulic fluid is washed around.
  • the US Pat. No. 6,435,430 B1 discloses a fuel injector having a fuel inlet port for supplying fuel, a piezoelectric or magnetostrictive actuator sealed by a seal against the fuel is, and one of the actuator by means of a valve needle operable valve closing body which cooperates with a valve seat surface to a sealing seat.
  • the seal comprises an inflow-side sealing plate, which is arranged between the fuel inlet nozzle and the actuator, and an elastically deformable in the longitudinal direction actuator sheath, which is connected to the inflow-side sealing plate.
  • the actuator casing is in particular wave-shaped or folded.
  • the fuel injection valve according to the invention with the features of claim 1 has the advantage that the flexible portion, which is connected to the actuating strand and hermetically seals the interior of the actuator housing from the exterior of the actuator housing, can be optimized in terms of the force effects of the actuating strand movements. Force effects which originate from pressure fluctuations in the interior of the actuator housing or resulting from pressure differences between the interior of the actuator housing and the exterior of the actuator housing, must not be taken into account in the dimensioning and design of the flexible section, since these force effects are largely offset by the compensation element ,
  • the movements of the actuation strand do not act directly on the compensation element, since it is structurally separated from the actuation strand.
  • the compensating element can thereby be optimized with regard to the force effect of the pressure differences.
  • the relief of the flexible section results in that the flexible section can be subjected to higher loads with regard to the forces which act on the flexible section via the confirmation strand. In particular, in reciprocating internal combustion engines, this allows an increase in the injection frequency. It also increases the life of the seal.
  • the fuel injection valve according to the invention with the features of the dependent claim 4 has the advantage over the prior art that the flexible portion can extend at least over the entire length of the actuator. Forces resulting from pressure differentials between the inside and the outside of the actuator housing are distributed evenly over the enlarged area of the flexible portion. The force-related stress of the flexible section per unit area by pressure differences is thus reduced.
  • the stress of the flexible section by the movements of the confirmation string are distributed to a greater length. This results in a reduced stress on the flexible section per unit length.
  • the compensation element is a membrane.
  • Membranes can be easily and inexpensively manufactured, wherein the properties of the membrane, such. B. the flexibility can be adjusted in a simple manner.
  • the compensation element and / or the flexible section consists at least partially of metal, in particular of steel.
  • Metals are excellent adjustable plastic and elastic properties. Steel has little fluctuating properties in the range of operating temperatures of a fuel injection valve and can be procured and processed at low cost.
  • the actuator housing is flattened or flattened at the connection point to the compensation element and thus forms a non-curved, two-dimensional plane.
  • the compensation element can be produced, for example, from a simple plate. Tensions within the compensating element and at the junction between the actuator housing and compensating element are thereby avoided.
  • the actuator housing may advantageously be flowed around by fuel. The heat loss of the actuator is thus removed in a simple manner via the heat-conducting medium and the actuator housing to the fuel.
  • an incompressible liquid is used as the heat-conducting medium.
  • An adaptation of the compensating element due to a pressure-dependent change in volume of the heat-conducting medium can thus be dispensed with.
  • the heat-conducting medium is a plastic paste, gel or potting compound, then the manufacturing effort can be simplified by these easy-to-use forms.
  • the heat-conducting medium is advantageously not electrically conductive, an additional, heat-insulating and error-prone insulation of the actuator can be dispensed with.
  • the heat-conducting medium is chemically neutral.
  • the life and reliability of the thermally conductive medium contacting components is thereby increased.
  • the flexible section is advantageously corrugated, the flexible section does not cause a pressure difference between the interior and exterior of the actuator housing during axial stretching or compression.
  • FIG. 1 in an axial sectional view of the invention shown fuel injector 1 is used in particular for the direct injection of fuel into a combustion chamber of a mixture-compressing, spark-ignited internal combustion engine.
  • a housing 2 are coaxial with each other, a piston-shaped coupler 18, a cylindrical or cylindrical actuator housing 12; a guide body 9 and a valve needle 3 with a valve closing body 4 are arranged.
  • the housing 2 has a fuel supply 17 at its upper end remote from the sprayer.
  • the coupler 18 is supported with its upper end against the inside of the upper end of the housing 2.
  • the cylindrical actuator housing 12 connects.
  • a piston-shaped actuator 14 is disposed between the inside of the upper end of the actuator housing 12 and a T-shaped Aktorpin 13 in cross-section.
  • the cross-section of the actuator 14 can, unlike a circular cross-section, also be square or hole-disc-shaped.
  • the actuator housing 12, deviating from a circular cross-section, may be formed corresponding to the cross section of the actuator 14.
  • the longitudinal element of the T. shaped Aktorpins 13 passes through the underside of the actuator housing 12.
  • the actuator housing 12 is completely filled with a heat-conducting medium.
  • the heat-conducting medium is an electrically non-conductive oil.
  • the disc-shaped guide body 9, in which both the lower end of the Aktorpins 13 and the upper end of the valve needle 3 are guided, has a fuel channel 10.
  • Abspritzicillin the guide body 9, the valve needle 3 is arranged with its valve closing body 4, a return spring 7, a flange 8 and a discharge opening 5.
  • the return spring 7 is supported on the inside of the lower end of the actuator housing 12 and presses into the valve needle 3 via the fixed to the valve needle 3 flange 8 with a bias against the lower end of the Aktorpins thirteenth
  • An electrical connection 20 is guided through the upper end of the housing 2 and laterally through the actuator housing 12 to the actuator 14.
  • a compensation element 16 is disposed in an opening 21 of the actuator housing 12.
  • the compensating element 16 in this embodiment has the shape of a membrane, is made of steel and seals the opening 21 hermetically.
  • the operation of the fuel injection valve 1 is as follows.
  • the actuator 14 In the rest position of the outwardly opening fuel injection valve 1, the actuator 14 is not energized.
  • the return spring 7 presses on the flange 8 and the valve needle 3, the valve closing body 4 against a arranged in the injection opening 5 valve seat surface 6. A formed by the valve closing body 4 and the valve seat 6 sealing seat is thus closed.
  • the actuator 14 For actuating the fuel injection valve 1, the actuator 14 is energized.
  • the actuator 14 expands in the longitudinal direction against the spring force of the spring element 15 and moves the existing in this embodiment of the Aktorpin 13 and the valve needle 3 confirmation strand 3.13 in Abspritzides.
  • the return spring 7 is compressed.
  • the valve closing body 4 lifts off from the valve seat surface 6 and the fuel supplied under pressure via the fuel feed 17 and the fuel channel 10 is sprayed off via the injection opening 5.
  • the compensation element 16 compensates for pressure differences, which are caused in particular by volume changes of the actuator 14.
  • the volume changes are made via the actuator housing 12, which is completely filled with the heat-conducting oil, to the flexible section 11 and the compensation element 16 transmitted in the form of a pressure change.
  • the softer and more resilient compared to the flexible portion 11 compensated compensation element 16 compensates for the volume changes and relieves the flexible portion 11 thereby from a pressure load, which are caused in particular by volume changes of the actuator 14 and the heat-conducting medium.
  • the corrugated tube-shaped flexible section 11 in this exemplary embodiment can therefore be replaced with a sufficient pressure relief by a simple membrane, not shown. Due to the complete structural separation of confirmation strand 3.13 and compensation element 16 is further achieved that the compensation element 16 is not burdened by the movements of the confirmation strand 3.13.
  • the fuel injection valve 1 may also have a Hubübersetzs observed not shown, which converts a small Aktorhub to a larger valve.
  • the Hubüber relies heard not shown may be part of the confirmation string 3.13.
  • the coupler 18 serves, in particular, to compensate for the thermal expansion of the actuator 14, is hermetically sealed with respect to the fuel surrounding it and is preferably designed with a flat membrane (not shown).
  • the coupler 18 can also be arranged between actuator 14 and valve needle 3 and be part of the confirmation strand 3, 13, wherein the actuator housing 19 would abut against the spray-away end of the inside of the housing 2.
  • An unillustrated coupler pin then transmits the stroke of the actuator 14 to the valve needle. 3
  • Fig. 2 shows a schematic representation of a fuel injection valve 1, similar to the first in Fig. 1 illustrated embodiment.
  • the flexible portion 11 forms a majority of the actuator housing 12.
  • the radially arranged to the actuator 14 sides 19 of the actuator housing 12 are in this Embodiment completely formed by the flexible portion 11, wherein the flexible portion 11 has the shape of a corrugated tube.
  • the flexible portion 11 may thus extend at least over the entire length of the actuator 14. Forces resulting from pressure differences between the inside and the outside of the actuator housing 12 are evenly distributed over the enlarged area of the flexible portion 11. The physical stress of the flexible portion 11 per unit area by pressure differences is thus reduced.
  • the stress of the flexible section 11 by the movements of the confirmation strand 3, 13 are distributed over a greater length. This results in a reduced stress on the flexible section 11 per unit length.
  • the invention is not limited to the illustrated embodiments and may, for. B. also be used for inward-opening fuel injectors.

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einem Brennstoffeinspritzventil nach der Gattung des Hauptanspruchs.The invention relates to a fuel injection valve according to the preamble of the main claim.

Beispielsweise ist aus der DE 40 05 455 A1 ein Brennstoffeinspritzventil mit einem piezoelektrischen Aktor bekannt, welcher über einen Bestätigungsstrang in Wirkverbindung mit einem Ventilschließkörper steht. Eine zu einem Bestätigungsstrang gehörende Ventilnadel weist an ihrem abspritzseitigen Ende den Ventilschließkörper auf, der mit einer Ventilsitzfläche zu einem Dichtsitz zusammenwirkt. Der Aktor ist in einem oberen Gehäuseteil angeordnet. Ein flexibler Abschnitt in Form einer Federmembran dichtet den oberen Gehäuseteil gegen einen mit Kraftstoff befüllten unteren Gehäuseteil hermetisch ab. Der flexible Abschnitt ist einerseits umfänglich an einem zum Bestätigungsstrang gehörenden Aktorpin und andererseits an den Innenflächen des unteren Gehäuseteils hermetisch dicht befestigt.For example, is from the DE 40 05 455 A1 a fuel injection valve with a piezoelectric actuator is known which is connected via a confirmation strand in operative connection with a valve closing body. A belonging to a confirmation strand valve needle has at its discharge end the valve closing body, which cooperates with a valve seat surface to a sealing seat. The actuator is arranged in an upper housing part. A flexible portion in the form of a spring membrane hermetically seals the upper housing member against a fuel-filled lower housing member. The flexible portion is on the one hand circumferentially hermetically sealed to a Aktorpin belonging to the confirmation strand and on the other hand to the inner surfaces of the lower housing part.

Ebenfalls ist bekannt, das Aktorgehäuse vollständig mit einer wärmeleitenden Flüssigkeit zu füllen, so daß der Aktor radial vollständig mit der wärmeleitenden Flüssigkeit in Kontakt steht. Dies dient der Wärmeableitung von Verlustwärme des Aktors.It is also known to completely fill the actuator housing with a heat-conducting liquid, so that the actuator is radially completely in contact with the heat-conducting liquid. This serves to dissipate the heat loss of the actuator.

Nachteilig geht aus dem Stand der Technik hervor, dass bei einem mit einer wärmeleitenden Flüssigkeit gefüllten Aktorgehäuse, der flexible Abschnitt, welcher zwischen dem Inneren des Aktorgehäuses und dem Äusseren des Aktorgehäuses liegt und unmittelbar mit dem Betätigungsstrang verbunden ist, sowohl von der Kraftwirkung der Bewegung des Bestätigungsstrangs als auch von den Druckwirkungen im Inneren des Aktorgehäuses beaufschlagt wird. Der flexible Abschnitt kann somit nicht bezüglich einer dieser Kraftwirkungen optimiert werden. Dadurch ergeben sich beispielsweise erhöhte Kraftwirkungen des flexiblen Abschnitts auf den Bestätigungsstrang, welche negativen Einfluss auf die Ventildynamik haben. Weiterhin kann dadurch beispielsweise die Lebensdauer des flexiblen Abschnitts verkürzt sein.A disadvantage is apparent from the prior art, that in a filled with a thermally conductive liquid actuator housing, the flexible portion which is located between the interior of the actuator housing and the exterior of the actuator housing and is directly connected to the actuating strand, both of the force of movement of the Confirmation strand is acted upon as well as the pressure effects inside the actuator housing. Thus, the flexible portion can not be optimized for any of these force effects. This results, for example, increased force effects of the flexible section on the confirmation train, which have a negative impact on the valve dynamics. Furthermore, this can be shortened, for example, the life of the flexible portion.

In der DE 100 35 168 A wird ein Dosierventil zur Dosierung eines unter Druck stehenden Dosierfluids beschrieben, das einen Ventilraum mit einem Ventilgehäuse zur Aufnahme einer Ventilnadel aufweist. Die Ventilnadel ist mit einem Stellantrieb verbunden und wird über diesen bewegt. Der Stellantrieb weist einen Piezoaktor auf, der in einer von einem Gehäuse begrenzten Aktorkammer angeordnet ist, wobei der Piezoaktor wenigstens einen Aktorstapel aufweist und der Aktorstapel mit seinen Stirnseiten zwischen einem Deckelement und einem Bodenelement eingespannt ist und wobei der Aktorstapel von einer in der Aktorkammer vorgesehenen Hydraulikflüssigkeit umspült wird.In the DE 100 35 168 A a metering valve for metering a pressurized metering fluid is described which has a valve chamber with a valve housing for receiving a valve needle. The valve needle is connected to an actuator and is moved over this. The actuator has a piezoelectric actuator which is arranged in an actuator chamber bounded by a housing, wherein the piezoelectric actuator has at least one actuator stack and the actuator stack is clamped with its end faces between a cover element and a bottom element and wherein the actuator stack of a provided in the actuator chamber hydraulic fluid is washed around.

Die US 6 435 430 B1 offenbart ein Brennstoffeinspritzventil mit einem Brennstoffeinlassstutzen zum Zuführen von Brennstoff, einem piezoelektrischen oder magnetostriktiven Aktor, der durch eine Abdichtung gegen den Brennstoff abgedichtet ist, und einem von dem Aktor mittels einer Ventilnadel betätigbaren Ventilschließkörper, der mit einer Ventilsitzfläche zu einem Dichtsitz zusammenwirkt. Dabei umfasst die Abdichtung eine zuflussseitige Dichtplatte, die zwischen dem Brennstoffeinlassstutzen und dem Aktor angeordnet ist, und einen in Längsrichtung elastisch verformbaren Aktormantel, der mit der zuflussseitigen Dichtplatte verbunden ist. Der Aktormantel ist insbesondere wellenförmig bzw. gefaltet ausgebildet.The US Pat. No. 6,435,430 B1 discloses a fuel injector having a fuel inlet port for supplying fuel, a piezoelectric or magnetostrictive actuator sealed by a seal against the fuel is, and one of the actuator by means of a valve needle operable valve closing body which cooperates with a valve seat surface to a sealing seat. In this case, the seal comprises an inflow-side sealing plate, which is arranged between the fuel inlet nozzle and the actuator, and an elastically deformable in the longitudinal direction actuator sheath, which is connected to the inflow-side sealing plate. The actuator casing is in particular wave-shaped or folded.

Vorteile der ErfindungAdvantages of the invention

Das erfindungsgemäße Brennstoffeinspritzventil mit den Merkmalen des Anspruchs 1 hat demgegenüber den Vorteil, dass der flexible Abschnitt, welcher mit dem Betätigungsstrang verbunden ist und das Innere des Aktorgehäuses von dem Äußeren des Aktorgehäuses hermetisch abdichtet, hinsichtlich der Kraftwirkungen der Betätigungsstrangbewegungen optimiert werden kann. Kraftwirkungen die aus Druckschwankungen im Inneren des Aktorgehäuses stammen bzw. aus Druckunterschieden zwischen dem Inneren des Aktorgehäuses und dem Äußeren des Aktorgehäuses herrühren, müssen bei der Dimensionierung und der Gestaltung des flexiblen Abschnitts nicht berücksichtigt werden, da diese Kraftwirkungen zu einem großen Teil vom Ausgleichselement ausgeglichen werden.The fuel injection valve according to the invention with the features of claim 1 has the advantage that the flexible portion, which is connected to the actuating strand and hermetically seals the interior of the actuator housing from the exterior of the actuator housing, can be optimized in terms of the force effects of the actuating strand movements. Force effects which originate from pressure fluctuations in the interior of the actuator housing or resulting from pressure differences between the interior of the actuator housing and the exterior of the actuator housing, must not be taken into account in the dimensioning and design of the flexible section, since these force effects are largely offset by the compensation element ,

Weiterhin wirken die Bewegungen des Betätigungsstrangs nicht unmittelbar auf das Ausgleichselement ein, da es baulich vom Betätigungsstrang getrennt ist. Das Ausgleichselement kann dadurch hinsichtlich der Kraftwirkung der Druckunterschiede optimiert werden.Furthermore, the movements of the actuation strand do not act directly on the compensation element, since it is structurally separated from the actuation strand. The compensating element can thereby be optimized with regard to the force effect of the pressure differences.

Die Entlastung des flexiblen Abschnitts führt dazu, daß der flexible Abschnitt hinsichtlich der Kräfte, die über den Bestätigungsstrang auf dem flexiblen Abschnitt einwirken, höher beansprucht werden kann. Insbesondere bei Hubkolbenverbrennungsmaschinen mit innerer Verbrennung erlaubt dies eine Steigerung der Einspritzfrequenz. Außerdem wird so die Lebensdauer der Dichtung erhöht.The relief of the flexible section results in that the flexible section can be subjected to higher loads with regard to the forces which act on the flexible section via the confirmation strand. In particular, in reciprocating internal combustion engines, this allows an increase in the injection frequency. It also increases the life of the seal.

Das erfindungsgemäße Brennstoffeinspritzventil mit den Merkmalen des abhängigen Anspruchs 4 hat gegenüber dem Stand der Technik den Vorteil, daß der flexible Abschnitt sich zumindest über die gesamte Länge des Aktors erstrecken kann. Kräfte die aus Druckunterschieden zwischen dem Inneren und dem Äußeren des Aktorgehäuses herrühren, werden gleichmäßig über die vergrößerte Fläche der flexiblen Abschnitts verteilt. Die kräftemäßige Beanspruchung des flexiblen Abschnitts pro Flächeneinheit durch Druckunterschiede ist somit reduziert.The fuel injection valve according to the invention with the features of the dependent claim 4 has the advantage over the prior art that the flexible portion can extend at least over the entire length of the actuator. Forces resulting from pressure differentials between the inside and the outside of the actuator housing are distributed evenly over the enlarged area of the flexible portion. The force-related stress of the flexible section per unit area by pressure differences is thus reduced.

Die Beanspruchung des flexiblen Abschnitts durch die Bewegungen des Bestätigungsstrangs werden auf eine größere Länge verteilt. Dadurch ergibt sich eine reduzierte Beanspruchung des flexiblen Abschnitts pro Längeneinheit.The stress of the flexible section by the movements of the confirmation string are distributed to a greater length. This results in a reduced stress on the flexible section per unit length.

In dem erfindungsgemäße Brennstoffeinspritzventil ist das Ausgleichselement eine Membran. Membranen können einfach und kostengünstig hergestellt werden, wobei die Eigenschaften der Membran, wie z. B. die Flexibilität, in einfacher Weise eingestellt werden können.In the fuel injection valve according to the invention, the compensation element is a membrane. Membranes can be easily and inexpensively manufactured, wherein the properties of the membrane, such. B. the flexibility can be adjusted in a simple manner.

In einer Weiterbildung des erfindungsgemäßen Brennstoffeinspritzventils besteht das Ausgleichselement und/oder der flexible Abschnitt zumindest teilweise aus Metall, insbesondere aus Stahl. Metalle haben vorzüglich einstellbare plastische und elastische Eigenschaften. Stahl weist im Bereich der Betriebstemperaturen eines Brennstoffeinspritzventils nur wenig schwankende Eigenschaften auf und kann kostengünstig beschafft und verarbeitet werden.In a further development of the fuel injection valve according to the invention, the compensation element and / or the flexible section consists at least partially of metal, in particular of steel. Metals are excellent adjustable plastic and elastic properties. Steel has little fluctuating properties in the range of operating temperatures of a fuel injection valve and can be procured and processed at low cost.

In einer weiteren Weiterbildung ist das Aktorgehäuse an der Verbindungsstelle zum Ausgleichselement abgeflacht bzw. abgeplattet und bildet so eine nicht gewölbte, zweidimensionale Ebene. Dadurch kann das Ausgleichselement beispielsweise aus einer einfachen Platte hergestellt werden. Spannungen innerhalb des Ausgleichselement und an der Verbindungsstelle zwischen Aktorgehäuse und Ausgleichselement werden dadurch vermieden.In a further development, the actuator housing is flattened or flattened at the connection point to the compensation element and thus forms a non-curved, two-dimensional plane. As a result, the compensation element can be produced, for example, from a simple plate. Tensions within the compensating element and at the junction between the actuator housing and compensating element are thereby avoided.

Das Aktorgehäuse kann vorteilhafter Weise von Brennstoff umströmt sein. Die Verlustwärme des Aktors wird so in einfacher Weise über das wärmeleitende Medium und das Aktorgehäuse an den Brennstoff abgeführt.The actuator housing may advantageously be flowed around by fuel. The heat loss of the actuator is thus removed in a simple manner via the heat-conducting medium and the actuator housing to the fuel.

Vorteilhafter Weise wird als wärmeleitendes Medium eine inkompressible Flüssigkeit verwendet. Eine Anpassung des Ausgleichselements aufgrund einer druckabhängigen Volumenänderung des wärmeleitenden Mediums kann somit entfallen.Advantageously, an incompressible liquid is used as the heat-conducting medium. An adaptation of the compensating element due to a pressure-dependent change in volume of the heat-conducting medium can thus be dispensed with.

Ist das wärmeleitende Medium eine plastische Paste, Gel oder Vergußmasse, so kann der Herstellungsaufwand durch diese einfach zu handhabenden Formen vereinfacht werden.If the heat-conducting medium is a plastic paste, gel or potting compound, then the manufacturing effort can be simplified by these easy-to-use forms.

Ist das wärmeleitende Medium vorteilhafter Weise elektrisch nicht leitend, so kann auf eine zusätzliche, wärmeisolierende und fehleranfällige Isolierung des Aktors verzichtet werden.If the heat-conducting medium is advantageously not electrically conductive, an additional, heat-insulating and error-prone insulation of the actuator can be dispensed with.

Vorteilhafter Weise ist das wärmeleitende Medium chemisch neutral. Die Lebensdauer und die Zuverlässigkeit der das wärmeleitende Medium berührenden Bauteile wird dadurch erhöht.Advantageously, the heat-conducting medium is chemically neutral. The life and reliability of the thermally conductive medium contacting components is thereby increased.

Ist der flexible Abschnitt vorteilhafterweise wellrohrförmig ausgebildet, so verursacht der flexible Abschnitt bei axialer Streckung oder Stauchung keinen Druckunterschied zwischen dem Inneren und Äußeren des Aktorgehäuses.If the flexible section is advantageously corrugated, the flexible section does not cause a pressure difference between the interior and exterior of the actuator housing during axial stretching or compression.

Zeichnungdrawing

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

Fig. 1
eine schematische Darstellung eines ersten Ausführungsbeispiels eines erfindungsgemäßen Brennstoffeinspritzventils und
Fig. 2
eine schematische Darstellung einer Brennstoffeinspritzventils.
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 schematic representation of a first embodiment of a fuel injection valve according to the invention and
Fig. 2
a schematic representation of a fuel injection valve.

Beschreibung der AusführungsbeispieleDescription of the embodiments

Nachfolgend werden Ausführungsbeispiele der Erfindung beispielhaft beschrieben. Übereinstimmende Bauteile sind dabei in den Figuren mit übereinstimmenden Bezugszeichen versehen.Hereinafter, embodiments of the invention will be described by way of example. Matching components are provided in the figures with corresponding reference numerals.

Ein in Fig. 1 in einer axialen Schnittdarstellung gezeigtes erfindungsgemäßes Brennstoffeinspritzventil 1 dient insbesondere zum direkten Einspritzen von Brennstoff in einen Brennraum einer gemischverdichtenden, fremdgezündeten Brennkraftmaschine. In einem Gehäuse 2 sind koaxial zueinander ein kolbenförmiger Koppler 18, ein zylinderförmiges oder rundzylinderförmiges Aktorgehäuse 12; ein Führungskörper 9 und eine Ventilnadel 3 mit einem Ventilschließkörper 4 angeordnet. Das Gehäuse 2 weist an seinem oberen, abspritzfernen Ende eine Brennstoffzuführung 17 auf. Der Koppler 18 stützt sich mit seinem oberen Ende gegen die Innenseite des oberen Endes des Gehäuses 2. An der Unterseite des Kopplers 18 schließt sich das zylinderförmige Aktorgehäuse 12 an. Innerhalb des Aktorgehäuses 12 ist ein kolbenförmiger Aktor 14 zwischen der Innenseite des oberen Endes des Aktorgehäuses 12 und einem im Querschnitt T-förmigen Aktorpin 13 angeordnet. Der Querschnitt des Aktors 14 kann, abweichend von einem kreisrunden Querschnitt, ebenso quadratisch oder lochscheibenförmig sein. Ebenso kann das Aktorgehäuse 12, abweichend von einem runden Querschnitt, entsprechend zum Querschnitt des Aktors 14 geformt sein.An in Fig. 1 in an axial sectional view of the invention shown fuel injector 1 is used in particular for the direct injection of fuel into a combustion chamber of a mixture-compressing, spark-ignited internal combustion engine. In a housing 2 are coaxial with each other, a piston-shaped coupler 18, a cylindrical or cylindrical actuator housing 12; a guide body 9 and a valve needle 3 with a valve closing body 4 are arranged. The housing 2 has a fuel supply 17 at its upper end remote from the sprayer. The coupler 18 is supported with its upper end against the inside of the upper end of the housing 2. At the Bottom of the coupler 18, the cylindrical actuator housing 12 connects. Within the actuator housing 12, a piston-shaped actuator 14 is disposed between the inside of the upper end of the actuator housing 12 and a T-shaped Aktorpin 13 in cross-section. The cross-section of the actuator 14 can, unlike a circular cross-section, also be square or hole-disc-shaped. Likewise, the actuator housing 12, deviating from a circular cross-section, may be formed corresponding to the cross section of the actuator 14.

Ein Federelement 15, welches einerseits an der Innenseite des oberen Endes des Aktorgehäuses 12 und andererseits am Querelement des T-förmigen Aktorpins 13 angebracht ist, hält den Aktorpin 13 mit einer Vorspannung in ständiger Anlage mit dem abspritzseitigen Ende des Aktors 14. Das Längselement des T-förmigen Aktorpins 13 durchgreift die Unterseite des Aktorgehäuses 12. Ein z. B. wellrohrförmiger flexibler Abschnitt 11, welcher einerseits am Aktorgehäuse 12 und andererseits umfänglich des Längselements des Aktorpins 13 fixiert ist, dichtet das Aktorgehäuse 12 hier hermetisch ab. Das Aktorgehäuse 12 ist vollständig mit einem wärmeleitenden Medium gefüllt. In diesem Ausführungsbeispiel ist das wärmeleitende Medium ein elektrisch nicht leitendes Öl.A spring element 15, which is attached on the one hand to the inside of the upper end of the actuator housing 12 and the other on the transverse element of the T-shaped Aktorpins 13, holds the Aktorpin 13 with a bias in constant contact with the discharge end of the actuator 14. The longitudinal element of the T. shaped Aktorpins 13 passes through the underside of the actuator housing 12. Ein z. B. corrugated flexible portion 11, which is fixed on the one hand on the actuator housing 12 and on the other hand circumferentially of the longitudinal member of the Aktorpins 13, seals the actuator housing 12 here hermetically. The actuator housing 12 is completely filled with a heat-conducting medium. In this embodiment, the heat-conducting medium is an electrically non-conductive oil.

Der scheibenförmige Führungskörper 9, in welchem sowohl das untere Ende des Aktorpins 13 als auch das obere Ende der Ventilnadel 3 geführt werden, weist einen Brennstoffkanal 10 auf. Abspritzseitig des Führungskörper 9 ist die Ventilnadel 3 mit ihrem Ventilschließkörper 4, eine Rückstellfeder 7, ein Flansch 8 und eine Abspritzöffnung 5 angeordnet. Die Rückstellfeder 7 stützt sich an der Innenseite des unteren Endes des Aktorgehäuses 12 auf und drückt in die Ventilnadel 3 über den an der Ventilnadel 3 fixierten Flansch 8 mit einer Vorspannung gegen das untere Ende des Aktorpins 13.The disc-shaped guide body 9, in which both the lower end of the Aktorpins 13 and the upper end of the valve needle 3 are guided, has a fuel channel 10. Abspritzseitig the guide body 9, the valve needle 3 is arranged with its valve closing body 4, a return spring 7, a flange 8 and a discharge opening 5. The return spring 7 is supported on the inside of the lower end of the actuator housing 12 and presses into the valve needle 3 via the fixed to the valve needle 3 flange 8 with a bias against the lower end of the Aktorpins thirteenth

Ein elektrischer Anschluß 20 ist durch das oberer Ende des Gehäuses 2 und seitlich durch das Aktorgehäuse 12 zum Aktor 14 geführt.An electrical connection 20 is guided through the upper end of the housing 2 and laterally through the actuator housing 12 to the actuator 14.

In einer Seite 19, welche in diesem Ausführungsbeispiel radial zum Aktor 14 angeordnet ist, ist ein Ausgleichselement 16 in einer Öffnung 21 des Aktorgehäuses 12 angeordnet. Das Ausgleichselement 16 hat in diesem Ausführungsbeispiel die Form einer Membran, ist aus Stahl hergestellt und dichtet die Öffnung 21 hermetisch ab.In a side 19, which is arranged radially to the actuator 14 in this embodiment, a compensation element 16 is disposed in an opening 21 of the actuator housing 12. The compensating element 16 in this embodiment has the shape of a membrane, is made of steel and seals the opening 21 hermetically.

Die Funktionsweise des Brennstoffeinspritzventils 1 ist wie folgt:The operation of the fuel injection valve 1 is as follows.

In Ruhelage des nach außen öffnenden Brennstoffeinspritzventils 1 ist der Aktor 14 nicht erregt. Die Rückstellfeder 7 drückt über den Flansch 8 und die Ventilnadel 3 den Ventilschließkörper 4 gegen eine in der Abspritzöffnung 5 angeordnete Ventilsitzfläche 6. Ein durch den Ventilschließkörper 4 und die Ventilsitzfläche 6 gebildeter Dichtsitz ist somit geschlossen.In the rest position of the outwardly opening fuel injection valve 1, the actuator 14 is not energized. The return spring 7 presses on the flange 8 and the valve needle 3, the valve closing body 4 against a arranged in the injection opening 5 valve seat surface 6. A formed by the valve closing body 4 and the valve seat 6 sealing seat is thus closed.

Zur Betätigung des Brennstoffeinspritzventils 1 wird der Aktor 14 erregt. Der Aktor 14 dehnt sich dabei in Längsrichtung entgegen der Federkraft des Federelements 15 aus und bewegt dabei den in diesem Ausführungsbeispiel aus dem Aktorpin 13 und der Ventilnadel 3 bestehenden Bestätigungsstrang 3,13 in Abspritzrichtung. Die Rückstellfeder 7 wird gestaucht. Der Ventilschließkörper 4 hebt von der Ventilsitzfläche 6 ab und der unter Druck über die Brennstoffzuführung 17 und den Brennstoffkanal 10 zugeführte Brennstoff wird über die Abspritzöffnung 5 abgespritzt.For actuating the fuel injection valve 1, the actuator 14 is energized. The actuator 14 expands in the longitudinal direction against the spring force of the spring element 15 and moves the existing in this embodiment of the Aktorpin 13 and the valve needle 3 confirmation strand 3.13 in Abspritzrichtung. The return spring 7 is compressed. The valve closing body 4 lifts off from the valve seat surface 6 and the fuel supplied under pressure via the fuel feed 17 and the fuel channel 10 is sprayed off via the injection opening 5.

Das Ausgleichselement 16 gleicht Druckunterschiede aus, die insbesondere durch Volumenänderungen des Aktors 14 hervorgerufen werden. Die Volumenänderungen werden über das vollständig mit dem wärmeleitenden Öl gefüllte Aktorgehäuse 12 auf den flexiblen Abschnitt 11 und das Ausgleichselement 16 in Form einer Druckänderung übertragen. Das im Vergleich zum flexiblen Abschnitt 11 weicher und nachgiebiger ausgelegte Ausgleichselement 16 gleicht die Volumenänderungen aus und entlastet den flexiblen Abschnitt 11 dadurch von einer Druckbelastung, die insbesondere durch Volumenänderungen des Aktors 14 und des wärmeleitenden Mediums verursacht sind. Der in diesem Ausführungsbeispiel wellrohrförmig ausgeführte flexible Abschnitt 11 kann deshalb bei ausreichender Druckentlastung durch eine einfache, nicht dargestellte Membran ersetzt werden. Durch die vollständige bauliche Trennung von Bestätigungsstrang 3,13 und Ausgleichselement 16 wird weiterhin erreicht, daß das Ausgleichselement 16 nicht durch die Bewegungen des Bestätigungsstrangs 3,13 belastet wird.The compensation element 16 compensates for pressure differences, which are caused in particular by volume changes of the actuator 14. The volume changes are made via the actuator housing 12, which is completely filled with the heat-conducting oil, to the flexible section 11 and the compensation element 16 transmitted in the form of a pressure change. The softer and more resilient compared to the flexible portion 11 compensated compensation element 16 compensates for the volume changes and relieves the flexible portion 11 thereby from a pressure load, which are caused in particular by volume changes of the actuator 14 and the heat-conducting medium. The corrugated tube-shaped flexible section 11 in this exemplary embodiment can therefore be replaced with a sufficient pressure relief by a simple membrane, not shown. Due to the complete structural separation of confirmation strand 3.13 and compensation element 16 is further achieved that the compensation element 16 is not burdened by the movements of the confirmation strand 3.13.

Das Brennstoffeinspritzventil 1 kann zudem eine nicht dargestellte Hubübersetzungseinrichtung aufweisen, welche einen kleinen Aktorhub auf einen größeren Ventilhub umsetzt. Die nicht dargestellte Hubübersetzungseinrichtung kann Teil des Bestätigungsstrangs 3,13 sein.The fuel injection valve 1 may also have a Hubübersetzseinrichtung not shown, which converts a small Aktorhub to a larger valve. The Hubübersetzungseinrichtung not shown may be part of the confirmation string 3.13.

Der Koppler 18 dient insbesondere zur Kompensation der Wärmeausdehnung des Aktors 14, ist gegenüber dem ihn umgebenden Brennstoff hermetisch abgedichtet und vorzugsweise mit einer nicht dargestellten Flachmembran ausgeführt. Der Koppler 18 kann ebenso zwischen Aktor 14 und Ventilnadel 3 angeordnet und Teil des Bestätigungsstrangs 3,13 sein, wobei das Aktorgehäuse 19 auf dem abspritzfernen Ende der Innenseite des Gehäuses 2 anliegen würde. Ein nicht dargestellter Kopplerpin überträgt dann den Hub des Aktors 14 auf die Ventilnadel 3.The coupler 18 serves, in particular, to compensate for the thermal expansion of the actuator 14, is hermetically sealed with respect to the fuel surrounding it and is preferably designed with a flat membrane (not shown). The coupler 18 can also be arranged between actuator 14 and valve needle 3 and be part of the confirmation strand 3, 13, wherein the actuator housing 19 would abut against the spray-away end of the inside of the housing 2. An unillustrated coupler pin then transmits the stroke of the actuator 14 to the valve needle. 3

Fig. 2 zeigt eine schematische Darstellung eines Brennstoffeinspritzventils 1, ähnlich dem ersten in Fig. 1 dargestellten Ausführungsbeispiel. Im Unterschied zum ersten Ausführungsbeispiel bildet der flexible Abschnitt 11 ein Großteil des Aktorgehäuses 12. Die radial zum Aktor 14 angeordneten Seiten 19 des Aktorgehäuses 12 sind in diesem Ausführungsbeispiel vollständig durch den flexiblen Abschnitts 11 gebildet, wobei der flexible Abschnitt 11 die Form eines Wellrohrs aufweist. Fig. 2 shows a schematic representation of a fuel injection valve 1, similar to the first in Fig. 1 illustrated embodiment. In contrast to the first embodiment, the flexible portion 11 forms a majority of the actuator housing 12. The radially arranged to the actuator 14 sides 19 of the actuator housing 12 are in this Embodiment completely formed by the flexible portion 11, wherein the flexible portion 11 has the shape of a corrugated tube.

Der flexible Abschnitt 11 kann sich so zumindest über die gesamte Länge des Aktors 14 erstrecken. Kräfte, die aus Druckunterschieden zwischen dem Inneren und dem Äußeren des Aktorgehäuses 12 herrühren, werden gleichmäßig über die vergrößerte Fläche der flexiblen Abschnitts 11 verteilt. Die kräftemäßige Beanspruchung des flexiblen Abschnitts 11 pro Flächeneinheit durch Druckunterschiede ist somit reduziert.The flexible portion 11 may thus extend at least over the entire length of the actuator 14. Forces resulting from pressure differences between the inside and the outside of the actuator housing 12 are evenly distributed over the enlarged area of the flexible portion 11. The physical stress of the flexible portion 11 per unit area by pressure differences is thus reduced.

Die Beanspruchung des flexiblen Abschnitts 11 durch die Bewegungen des Bestätigungsstrangs 3,13 werden auf eine größere Länge verteilt. Dadurch ergibt sich eine reduzierte Beanspruchung des flexiblen Abschnitts 11 pro Längeneinheit.The stress of the flexible section 11 by the movements of the confirmation strand 3, 13 are distributed over a greater length. This results in a reduced stress on the flexible section 11 per unit length.

Die Erfindung ist nicht auf die dargestellten Ausführungsbeispiele beschränkt und kann z. B. auch für nach innen öffnende Brennstoffeinspritzventile verwendet werden.The invention is not limited to the illustrated embodiments and may, for. B. also be used for inward-opening fuel injectors.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
BrennstoffeinspritzventilFuel injector
22
Gehäusecasing
33
Ventilnadelvalve needle
44
VentilschließkörperValve closing body
55
Abspritzöffnungspray opening
66
VentilsitzflächeValve seat
77
RückstellfederReturn spring
88th
Flanschflange
99
Führungskörperguide body
1010
Brennstoffkanalfuel channel
1111
flexibler Abschnittflexible section
1212
Aktorgehäuseactuator housing
1313
AktorpinAktorpin
1414
Aktoractuator
1515
Federelementspring element
1616
Ausgleichseinrichtungbalancer
1717
Brennstoffzuführungfuel supply
1818
Kopplercoupler
1919
Seitepage
2020
elektrischer Anschlußelectrical connection
2121
Öffnungopening

Claims (11)

  1. Fuel injection valve (1), in particular for directly injecting fuel into a combustion chamber of an internal combustion engine, having a piezoelectric, electrostrictive or magnetostrictive actuator (14), and having a valve closing body (4) which is operatively connected to the actuator (14) via an actuation train (3, 13) and which interacts with a valve seat surface (6) to form a sealing seat, the actuator (14) being surrounded in a hermetically sealed fashion by an actuator housing (12) with a flexible section (11), the flexible section (11) being connected to the actuation train (3, 13), and the actuator (14) being surrounded, in the actuator housing (12), by a heat-conducting medium,
    characterized
    in that the actuator housing (12) has, in an opening (21) in a side (19) arranged radially with respect to the actuator (14), a compensating element (16) for compensating pressure differences between the interior and the exterior of the actuator housing (12), the compensating element (16) being a diaphragm which hermetically seals off the opening (21).
  2. Fuel injection valve (1) according to Claim 1,
    characterized
    in that the compensating element (16) is composed at least partially of metal, in particular of steel.
  3. Fuel injection valve (1) according to one of the preceding claims,
    characterized
    in that the actuator housing (12), at the connecting point to the compensating element (16), forms a non-curved, two-dimensional plane.
  4. Fuel injection valve (1) according to one of the preceding claims,
    characterized
    in that sides (19), which are arranged radially with respect to the actuator (14), of the actuator housing (12) form the flexible section (11).
  5. Fuel injection valve (1) according to one of the preceding claims,
    characterized
    in that a flow of fuel passes around the actuator housing (12).
  6. Fuel injection valve (1) according to one of the preceding claims,
    characterized
    in that the heat-conducting medium is an incompressible liquid.
  7. Fuel injection valve (1) according to one of Claims 1 to 5,
    characterized
    in that the heat-conducting medium is a plastic paste, gel or filling compound.
  8. Fuel injection valve (1) according to one of the preceding claims,
    characterized
    in that the heat-conducting medium is electrically nonconductive.
  9. Fuel injection valve (1) according to one of the preceding claims,
    characterized
    in that the heat-conducting medium is chemically neutral.
  10. Fuel injection valve (1) according to one of the preceding claims,
    characterized
    in that the flexible section (11) is in the form of a corrugated pipe.
  11. Fuel injection valve (1) according to one of the preceding claims,
    characterized
    in that the flexible section (11) is composed at least partially of metal, in particular of steel.
EP20030015164 2002-12-19 2003-07-04 Fuel injection valve Expired - Lifetime EP1431568B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2002159801 DE10259801A1 (en) 2002-12-19 2002-12-19 Fuel injector
DE10259801 2002-12-19

Publications (3)

Publication Number Publication Date
EP1431568A2 EP1431568A2 (en) 2004-06-23
EP1431568A3 EP1431568A3 (en) 2004-12-29
EP1431568B1 true EP1431568B1 (en) 2011-02-23

Family

ID=32336493

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20030015164 Expired - Lifetime EP1431568B1 (en) 2002-12-19 2003-07-04 Fuel injection valve

Country Status (3)

Country Link
EP (1) EP1431568B1 (en)
JP (1) JP2004197743A (en)
DE (2) DE10259801A1 (en)

Cited By (1)

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KR102007016B1 (en) 2011-09-09 2019-10-01 콘티넨탈 오토모티브 게엠베하 Valve assembly and injection valve

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DE102004026171B4 (en) * 2004-05-28 2010-05-20 Continental Automotive Gmbh Injector
DE502005008874D1 (en) 2004-07-07 2010-03-04 Continental Automotive Gmbh ELECTRONIC PARKING BRAKE AND METHOD FOR CONTROLLING AN ELECTRONIC PARKING BRAKE
EP1816341B1 (en) * 2006-02-03 2011-04-27 Continental Automotive GmbH Actuator device for an injector and injector
DE502006007633D1 (en) * 2006-05-09 2010-09-23 Continental Automotive Gmbh Fuel injection system and a method of manufacturing this injection system
DE102006022998A1 (en) * 2006-05-17 2007-11-22 Robert Bosch Gmbh Arrangement with a flow of liquid media piezoelectric actuator
DE102007053423A1 (en) * 2007-11-09 2009-05-14 Robert Bosch Gmbh Piezoelectric actuator module
JP5246149B2 (en) * 2009-12-08 2013-07-24 株式会社デンソー Injector
JP2017066955A (en) * 2015-09-30 2017-04-06 日立オートモティブシステムズ株式会社 Flow control valve

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DE4005455A1 (en) * 1989-02-28 1990-08-30 Volkswagen Ag Dosing valve for vehicle IC engine fuel injection - has piezoelectric actuator and spring membrane seal for closing force
DE19857247C1 (en) * 1998-12-11 2000-01-27 Bosch Gmbh Robert Piezoelectric actuator for actuating control or injection valves in motor vehicle internal combustion engines
DE19912666A1 (en) * 1999-03-20 2000-09-21 Bosch Gmbh Robert Fuel injector
DE10035168A1 (en) * 2000-07-19 2002-02-07 Siemens Ag Piezoelectric actuator for e.g. dosing fuel from pressurized source for fuel injection valve, comprises hydraulic fluid which forms electrical passivation layer for actuator stack
DE10048430A1 (en) * 2000-09-29 2002-04-25 Bosch Gmbh Robert Piezoelectric actuator, e.g. for control valves in vehicles, has piezoelectric material and metal or electrical conducting layers forming actuator body and gap provided between body and enclosing jacket is filled with liquid medium
DE10054017A1 (en) * 2000-11-01 2002-05-08 Bosch Gmbh Robert Piezo-actuator module, especially for fuel injection system, has sheath element designed as heat-conducting rubber element which has shell-shaped design and lies directly on piezo-actuator
DE10245109A1 (en) * 2002-09-27 2004-04-08 Siemens Ag Fuel injector valve for diesel and petrol engines with piezoelectric actuator enclosed in cooling fluid

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KR102007016B1 (en) 2011-09-09 2019-10-01 콘티넨탈 오토모티브 게엠베하 Valve assembly and injection valve

Also Published As

Publication number Publication date
DE50313486D1 (en) 2011-04-07
DE10259801A1 (en) 2004-07-01
EP1431568A3 (en) 2004-12-29
EP1431568A2 (en) 2004-06-23
JP2004197743A (en) 2004-07-15

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