EP1972778B1 - Cable duct for a piezo actuator module - Google Patents

Cable duct for a piezo actuator module Download PDF

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Publication number
EP1972778B1
EP1972778B1 EP20080102596 EP08102596A EP1972778B1 EP 1972778 B1 EP1972778 B1 EP 1972778B1 EP 20080102596 EP20080102596 EP 20080102596 EP 08102596 A EP08102596 A EP 08102596A EP 1972778 B1 EP1972778 B1 EP 1972778B1
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EP
European Patent Office
Prior art keywords
actuator
bushes
piezo
cable
metallic
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Expired - Fee Related
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EP20080102596
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German (de)
French (fr)
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EP1972778A1 (en
Inventor
Jochen Winkler
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Robert Bosch GmbH
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Robert Bosch GmbH
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    • 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
    • F02M51/005—Arrangement of electrical wires and connections, e.g. wire harness, sockets, plugs; Arrangement of electronic control circuits in or on fuel injection apparatus
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/16—Sealing of fuel injection apparatus not otherwise provided for
    • 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
    • F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
    • F02M2200/8084—Fuel injection apparatus manufacture, repair or assembly involving welding or soldering
    • 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
    • F02M2200/90—Selection of particular materials
    • F02M2200/9007—Ceramic materials
    • 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
    • F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
    • F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
    • F02M47/027—Electrically actuated valves draining the chamber to release the closing pressure

Definitions

  • the invention relates to cable bushings for the electrical contacting in a piezoelectric actuator according to the preamble of the main claim, which can be used, for example, in a piezo injector for timely and quantitative metering of fuel in an internal combustion engine.
  • Such a piezo injector essentially consists of a holding body and the piezoelectric actuator arranged in the holding body, which has arranged between an actuator head and an actuator base, stacked piezoelectric elements, each consisting of enclosed with internal electrodes piezoelectric layers.
  • the piezoelectric elements are constructed using a material with a suitable crystal structure (piezoceramic) for the piezoelectric layers so that upon application of an external voltage to the internal electrodes, a mechanical reaction of the piezoelectric elements takes place, which in dependence on the crystal structure and the contact areas of the electrical voltage, a pressure or train in a predeterminable direction.
  • the piezoelectric actuator is connected to a nozzle injector with a nozzle needle, so that by applying a voltage to the piezoelectric elements, a nozzle opening is released or closed.
  • a piezo injector with a via a hydraulic pressure booster acting on a valve member piezoelectric actuator in which the piezoelectric elements of the piezoelectric actuator are arranged in a sleeve-membrane combination.
  • the piezoelectric actuator is positioned within a sleeve and the open ends of the sleeve are closed by welds and there are arranged at one end (actuator head) a steel component and a metal diaphragm, wherein the diaphragm adapts to the stroke of the piezoelectric actuator.
  • a steel component (actuator foot) through the isolated leads, the electrical contacting of the piezoelectric elements of the piezoelectric actuator is made possible.
  • wires may be routed via plug parts as electrical leads to external electrodes on the piezo elements of the piezoelectric actuator.
  • a high-pressure seal to an electrical connection space arranged above the piezoelectric actuator is necessary here, through which the electrical lines for electrical contacting of the piezo injector are led to the outside, for example via a high-pressure-tight, for Example, against pressures of about 2000 bar, glass-melted sealing bush in the actuator base of the piezoelectric actuator can be done.
  • the Glaseinschmelzung is either pressed as a separate component in a support member made of metal or the glass is melted directly into the metal part.
  • the disadvantage of this arrangement is mainly because the press connection can not be made completely tight and in the direct fusion, the metal part is soft, ie. it can not be remunerated.
  • the invention is based on the above-described cable bushings for a piezoelectric actuator with a piezoelectric actuator having arranged between an actuator head and an actuator base arranged piezoelectric elements, wherein in the metallic Aktorfuß isolated running cables for the electrical contacting of the piezoelectric elements are present.
  • the cable bushings sockets each consisting of a solderable or weldable non-conductive material and the outside with the metallic actuator foot and / or inside the metallic conductor of the cable with the leads to the piezo elements are soldered or welded.
  • the sockets are made of a solderable ceramic material, for example, alumina.
  • Such a piezoactuator module may advantageously be part of a piezo injector for an injection system for fuel in an internal combustion engine, as this eliminates the need for the use of expensive special components and the risk of leakage to the environment, d. H. in particular, a discharge of fuel is reduced.
  • simple ceramic mass parts can be used favorably, since the guarantee of absolute tightness and a compensation of surface tolerances by soldering can be achieved;
  • the metal components (actuator foot) can also be tempered.
  • the jacks can be made individually or advantageously be sheared from a long round material for cost reasons.
  • the bushes are cylindrical and can be inserted into a corresponding stepped bore in the metallic Aktorfuß, wherein advantageously a solder ring can be introduced into the stepped bore before introducing the respective socket, which facilitates the soldering during the soldering process.
  • the bushings are tapered and then inserted into a likewise conical bore in the metallic Aktorfuß. Both variants improve the supporting action of the cable glands against the high pressure of a liquid in the surrounding space.
  • FIG. 1 an arrangement 1 is shown with a piezoelectric actuator 2, which can be used for example for Nadelhub Kunststoffung in the injection system for fuel in an internal combustion engine.
  • piezoelectric elements 3 are part of the piezoelectric actuator 2, which still has an actuator base 4 and an actuator head 5 as a metallic tether of steel.
  • a mechanical arrangement located vertically below the actuator head 5 can be actuated such that, for example, a release of a nozzle opening of the injection system can take place.
  • the arrangement 1 with the piezoelectric actuator 2 is installed in an injector body, not shown here, wherein the fuel is guided past the arrangement 1 through the interior of the injector body.
  • This fuel can then be injected for example in a so-called common rail system under the rail pressure mentioned in the introduction or another predetermined pressure in the combustion chamber of an internal combustion engine, not shown here.
  • the leads 6 and 7 are guided by means of cable bushings 10 and 11 through the actuator base 4, wherein here only schematically ceramic bushings 12 and 13 and in each case an electrical coupling 14 and 15 to the not visible here lead wires in the outwardly guided cable 16 can be seen.
  • the leads 6 and 7 are here in the jacks 12 and 13 made of a non-conductive but solderable ceramic material, such as alumina, and at the end of the sockets 12 and 13 with the leads of the outer cable 16 preferably also by soldering to the here exemplary meadow executed electrical couplings 14 and 15 conductively connected.
  • the bush 12 made of the nonconductive but solderable ceramic material is connected via a solder 17 to the actuator base 4 and via a solder 18 the supply line 6 to the corresponding connecting wire of the outer cable 16.
  • the bushings are cylindrical and inserted into a corresponding stepped bore in the metallic actuator base 4, in which case a solder ring can be introduced into the stepped bore before the introduction of the respective bush, which facilitates the soldering in the soldering process.
  • the actuator foot 4 as a metallic support member, the piezoelectric actuator 2 after the FIG. 1 Connect with a holding body, not shown here, thereby ensuring the electrical connection of the piezoelectric actuator 2 and seals it at the same time against the hydraulic fuel pressure of about 2000 bar, in the actuator chamber of the piezoelectric actuator to the arrangement 1 after the FIG. 1 prevails against the environment.
  • the actuator foot 4 as a metallic support member must be quenched before the surface treatment, usually grinding, which is achieved with the inventive introduction of the ceramic jacks 12 and 13, wherein the leads 6 and 7 as control of the piezoelectric elements 3 of the ceramic piezoelectric actuator 2 positionally accurate can be clamped and the seal between the sockets 12 and 13 and between the sockets 12 and 13 and the actuator base 4 via a standard brazing process.

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

Description

Stand der TechnikState of the art

Die Erfindung betrifft Kabeldurchführungen für die elektrische Kontaktierung in einem Piezoaktormodul gemäß der Gattung des Hauptanspruchs, das beispielsweise in einem Piezoinjektor zur zeitpunkt- und mengengenauen Dosierung von Kraftstoff in einem Verbrennungsmotor eingesetzt werden kann.The invention relates to cable bushings for the electrical contacting in a piezoelectric actuator according to the preamble of the main claim, which can be used, for example, in a piezo injector for timely and quantitative metering of fuel in an internal combustion engine.

Ein solcher Piezoinjektor besteht im Wesentlichen aus einem Haltekörper und dem im Haltekörper angeordneten Piezoaktor, der zwischen einem Aktorkopf und einem Aktorfuß angeordnete, übereinandergestapelte Piezoelemente aufweist, die jeweils aus mit Innenelektroden eingefassten Piezolagen bestehen. Die Piezoelemente sind unter Verwendung eines Materials mit einer geeigneten Kristallstruktur (Piezokeramik) für die Piezolagen so aufgebaut, dass bei Anlage einer äußeren Spannung an die Innenelektroden eine mechanische Reaktion der Piezoelemente erfolgt, die in Abhängigkeit von der Kristallstruktur und der Anlagebereiche der elektrischen Spannung einen Druck oder Zug in eine vorgebbare Richtung darstellt. Der Piezoaktor ist bei einem Piezoinjektor mit einer Düsennadel verbunden, sodass durch Anlegen einer Spannung an die Piezoelemente eine Düsenöffnung freigegeben oder geschlossen wird.Such a piezo injector essentially consists of a holding body and the piezoelectric actuator arranged in the holding body, which has arranged between an actuator head and an actuator base, stacked piezoelectric elements, each consisting of enclosed with internal electrodes piezoelectric layers. The piezoelectric elements are constructed using a material with a suitable crystal structure (piezoceramic) for the piezoelectric layers so that upon application of an external voltage to the internal electrodes, a mechanical reaction of the piezoelectric elements takes place, which in dependence on the crystal structure and the contact areas of the electrical voltage, a pressure or train in a predeterminable direction. The piezoelectric actuator is connected to a nozzle injector with a nozzle needle, so that by applying a voltage to the piezoelectric elements, a nozzle opening is released or closed.

Aus der DE 101 39 871 A1 ist ein Piezoinjektor mit einem über einen hydraulischen Druckübersetzer auf ein Ventilglied einwirkenden Piezoaktormodul bekannt, bei dem die Piezoelemente des Piezoaktors in einer Hülsen-Membran-Kombination angeordnet sind. Dabei wird der Piezoaktor innerhalb einer Hülse positioniert und die offenen Enden der Hülse werden durch Schweißnähte verschlossen und es sind an einem Ende (Aktorkopf) ein Stahlbauteil sowie eine Metallmembran angeordnet, wobei sich die Membran an den Hub des Piezoaktors anpasst. An dem anderen Ende befindet sich ebenfalls ein Stahlbauteil (Aktorfuß), durch das über isolierte Zuleitungen die elektrische Kontaktierung der Piezoelemente des Piezoaktors ermöglicht wird.From the DE 101 39 871 A1 a piezo injector with a via a hydraulic pressure booster acting on a valve member piezoelectric actuator is known in which the piezoelectric elements of the piezoelectric actuator are arranged in a sleeve-membrane combination. In this case, the piezoelectric actuator is positioned within a sleeve and the open ends of the sleeve are closed by welds and there are arranged at one end (actuator head) a steel component and a metal diaphragm, wherein the diaphragm adapts to the stroke of the piezoelectric actuator. Located at the other end Also a steel component (actuator foot), through the isolated leads, the electrical contacting of the piezoelectric elements of the piezoelectric actuator is made possible.

Hierbei sind eventuell über Steckerteile Drähte als elektrische Leitungen zu Außenelektroden an den Piezoelementen des Piezoaktors geführt. Insbesondere bei Piezoinjektoren in sogenannten Common-Rail (CR)-Systemen ist hier eine Hochdruckabdichtung zu einem oberhalb des Piezoaktors angeordneten elektrischen Anschlussraum notwendig, durch den die elektrischen Leitungen zur elektrischen Kontaktierung des Piezoinjektors nach außen geführt sind, wobei dies beispielsweise über eine hochdruckdichte, zum Beispiel gegen Drücke von ca. 2000 bar, glaseingeschmolzene Dichtbuchse im Aktorfuß des Piezoaktormoduls erfolgen kann. Die Glaseinschmelzung wird entweder als separates Bauteil in ein Trägerbauteil aus Metall eingepresst oder das Glas wird direkt in das Metallteil eingeschmolzen.In this case, wires may be routed via plug parts as electrical leads to external electrodes on the piezo elements of the piezoelectric actuator. Particularly in the case of piezo injectors in so-called common-rail (CR) systems, a high-pressure seal to an electrical connection space arranged above the piezoelectric actuator is necessary here, through which the electrical lines for electrical contacting of the piezo injector are led to the outside, for example via a high-pressure-tight, for Example, against pressures of about 2000 bar, glass-melted sealing bush in the actuator base of the piezoelectric actuator can be done. The Glaseinschmelzung is either pressed as a separate component in a support member made of metal or the glass is melted directly into the metal part.

Nachteilig ist diese Anordnung vor allem deshalb, weil die Pressverbindung nicht vollständig dicht gemacht werden kann und bei der Direktverschmelzung ist das Metallteil weich, dh. es kann nicht vergütet werden.The disadvantage of this arrangement is mainly because the press connection can not be made completely tight and in the direct fusion, the metal part is soft, ie. it can not be remunerated.

Eine weitere Möglichkeit, die darin besteht herkömmliche keramische Bauteile anzuwenden, ist insofern nachteilig, dass bei der Herstellung der notwendigen komplexen Bauteile hohe Oberflächen- und Toleranzanforderungen eingehalten werden müssen und diese sehr teuer sind, da die Nachbearbeitung von solcher Keramik einen sehr hohen Aufwand erfordert, zudem ist die Anbindung der herkömmlichen keramischen Bauteile an die metallischen Bauteile (Aktorfuß) schwer möglich. Weiterhin ist auch eine Endbearbeitung und Vergütung des metallischen Tragerteiles nicht bei allen Varianten möglich.Another possibility, which is to use conventional ceramic components, is disadvantageous in that in the production of the necessary complex components high surface and tolerance requirements must be met and they are very expensive, since the post-processing of such ceramics requires a very high effort, In addition, the connection of conventional ceramic components to the metallic components (actuator foot) is difficult. Furthermore, a finishing and remuneration of the metallic support member is not possible in all variants.

Aus dem später veröffentlichten Dokument EP 1849991 A ist ein Piezoaktor bekannt, bei dem Keramikbuchsen mittels Hartlötverbindung am Aktorgehäuse befestigt sind.From the later published document EP 1849991 A a piezoelectric actuator is known in which ceramic bushes are fixed by means of brazed joint on the actuator housing.

Offenbarung der ErfindungDisclosure of the invention

Die Erfindung geht von eingangs beschriebenen Kabeldurchführungen für ein Piezoaktormodul mit einem Piezoaktor aus, der zwischen einem Aktorkopf und einem Aktorfuß angeordnete Piezoelemente aufweist, wobei im metallischen Aktorfuß isoliert verlaufende Kabel für die elektrische Kontaktierung der Piezoelemente vorhanden sind. Erfindungsgemäß weisen in vorteilhafter Weise die Kabeldurchführungen Buchsen auf, die jeweils aus einem löt- oder verschweißbaren nichtleitendem Material bestehen und außen mit dem metallischen Aktorfuß und/oder innen die metallischen Leiter des Kabels mit den Zuleitungen zu den Piezoelementen verlötet oder verschweißt sind.The invention is based on the above-described cable bushings for a piezoelectric actuator with a piezoelectric actuator having arranged between an actuator head and an actuator base arranged piezoelectric elements, wherein in the metallic Aktorfuß isolated running cables for the electrical contacting of the piezoelectric elements are present. According to the invention advantageously have the cable bushings sockets, each consisting of a solderable or weldable non-conductive material and the outside with the metallic actuator foot and / or inside the metallic conductor of the cable with the leads to the piezo elements are soldered or welded.

Vorzugweise bestehen die Buchsen aus einem lötbaren Keramikmaterial, zum Beispiel Auminiumoxid.Preferably, the sockets are made of a solderable ceramic material, for example, alumina.

Ein solches Piezoaktormodul kann in vorteilhafter Weise Bestandteil eines Piezoinjektors für ein Einspritzsystem für Kraftstoff bei einem Verbrennungsmotor sein, da hiermit die Notwendigkeit der Verwendung von teuren Sonderbauteilen entfällt und das Risiko von Undichtheit gegenüber der Umgebung, d. h. insbesondere einen Austritt von Kraftstoff vermindert ist. Weiterhin können einfache keramische Massenteile günstig verwendet werden, da die Gewährleistung absoluter Dichtheit und ein Ausgleich von Oberflächentoleranzen durch das Löten erreichbar ist; außerdem können die Metallbauteile (Aktorfuß) auch vergütet werden.Such a piezoactuator module may advantageously be part of a piezo injector for an injection system for fuel in an internal combustion engine, as this eliminates the need for the use of expensive special components and the risk of leakage to the environment, d. H. in particular, a discharge of fuel is reduced. Furthermore, simple ceramic mass parts can be used favorably, since the guarantee of absolute tightness and a compensation of surface tolerances by soldering can be achieved; In addition, the metal components (actuator foot) can also be tempered.

Die Buchsen können in vorteilhafter Weise einzeln gefertigt sein oder aus Kostengründen auch von einem langen Rundmaterial abgeschert werden. Gemäß einer ersten Ausführungsform der erfindungsgemäßen Kabeldurchführung sind die Buchsen zylindrisch ausgeführt und in eine korrespondierende Stufenbohrung im metallischen Aktorfuß einfügbar, wobei in vorteilhafter Weise vor dem Einbringen der jeweiligen Buchse ein Lotring in die Stufenbohrung eingebracht werden kann, der bei dem Lötprozess die Lotzufuhr erleichtert.The jacks can be made individually or advantageously be sheared from a long round material for cost reasons. According to a first embodiment of the cable bushing according to the invention, the bushes are cylindrical and can be inserted into a corresponding stepped bore in the metallic Aktorfuß, wherein advantageously a solder ring can be introduced into the stepped bore before introducing the respective socket, which facilitates the soldering during the soldering process.

Gemäß einer anderen ebenfalls sehr vorteilhaften Ausführungsform werden die Buchsen konisch ausgeführt und dann in eine ebenfalls konische Bohrung im metallischen Aktorfuß eingelegt. Beide Varianten verbessern die Abstützwirkung der Kabeldurchführungen gegen den hohen Druck einer Flüssigkeit im umgebenden Raum.According to another also very advantageous embodiment, the bushings are tapered and then inserted into a likewise conical bore in the metallic Aktorfuß. Both variants improve the supporting action of the cable glands against the high pressure of a liquid in the surrounding space.

Kurze Beschreibung der ZeichnungenBrief description of the drawings

Die Erfindung wird nachfolgend anhand des in den Zeichnungen gezeigten Ausführungsbeispiels erläutert. Dabei zeigen:

  • Figur 1 eine schematische Darstellung eines Piezoinjektors mit einem Piezoaktormodul mit Kabeldurchführungen im Längsschnitt und
  • Figur 2 eine separate Darstellung des Aktorfußes des Piezoaktormoduls nach der Figur 1 mit einer gelöteten konischen Buchse als Bestandteil der Kabeldurchführungen.
The invention will be explained below with reference to the embodiment shown in the drawings. Showing:
  • FIG. 1 a schematic representation of a piezo injector with a piezoelectric actuator with cable glands in longitudinal section and
  • FIG. 2 a separate view of the actuator base of the piezoelectric actuator according to the FIG. 1 with a soldered conical socket as part of the cable glands.

Ausführungsform der ErfindungEmbodiment of the invention

In Figur 1 ist eine Anordnung 1 mit einem Piezoaktor 2 gezeigt, die beispielsweise zur Nadelhubsteuerung im Einspritzsystem für Kraftstoff bei einem Verbrennungsmotor eingesetzt werden kann. Hier im einzelnen nicht gezeigte, aber aus dem eingangs genannten Stand der Technik bekannte Piezoelemente 3 sind Bestandteil des Piezoaktors 2, der weiterhin noch einen Aktorfuß 4 und einen Aktorkopf 5 als metallisches Anbindeteil aus Stahl aufweist. Es sind elektrische Zuleitungen 6 und 7 durch den Aktorfuß 4 geführt, die über Außenelektroden 8 und 9 an hier ebenfalls nicht dargestellten Innenelektroden der Piezoelemente 3 kontaktiert sind. Bei einer Betätigung des Piezoaktors 2 durch eine Spannungsbeaufschlagung der Innenelektroden kann eine hier senkrecht unterhalb des Aktorkopfes 5 befindliche mechanische Anordnung derart betätigt werden, dass hier beispielsweise eine Freigabe einer Düsenöffnung des Einspritzsystems erfolgen kann.In FIG. 1 an arrangement 1 is shown with a piezoelectric actuator 2, which can be used for example for Nadelhubsteuerung in the injection system for fuel in an internal combustion engine. Not shown here in detail, but known from the aforementioned prior art piezoelectric elements 3 are part of the piezoelectric actuator 2, which still has an actuator base 4 and an actuator head 5 as a metallic tether of steel. There are electrical leads 6 and 7 passed through the actuator base 4, which are contacted via external electrodes 8 and 9 at here also not shown internal electrodes of the piezoelectric elements 3. Upon actuation of the piezoelectric actuator 2 by applying voltage to the internal electrodes, a mechanical arrangement located vertically below the actuator head 5 can be actuated such that, for example, a release of a nozzle opening of the injection system can take place.

Die Anordnung 1 mit dem Piezoaktor 2 ist in einem hier nicht gezeigten Injektorkörper eingebaut, wobei der Kraftstoff durch den Innenraum des Injektorkörpers an der Anordnung 1 vorbeigeführt wird. Dieser Kraftstoff kann dann beispielsweise bei einem sogenannten Common Rail System unter dem in der Beschreibungseinleitung erwähnten Raildruck oder einem anderen vorgebbaren Druck in den Brennraum eines hier nicht dargestellten Verbrennungsmotors injiziert werden.The arrangement 1 with the piezoelectric actuator 2 is installed in an injector body, not shown here, wherein the fuel is guided past the arrangement 1 through the interior of the injector body. This fuel can then be injected for example in a so-called common rail system under the rail pressure mentioned in the introduction or another predetermined pressure in the combustion chamber of an internal combustion engine, not shown here.

Die Zuleitungen 6 und 7 sind mittels Kabeldurchführungen 10 und 11 durch den Aktorfuß 4 geführt, wobei hier nur schematisch keramische Buchsen 12 und 13 und jeweils eine elektrische Kopplung 14 und 15 zu den hier nicht erkennbaren Anschlussdrähten im nach außen geführten Kabel 16 erkennbar sind.The leads 6 and 7 are guided by means of cable bushings 10 and 11 through the actuator base 4, wherein here only schematically ceramic bushings 12 and 13 and in each case an electrical coupling 14 and 15 to the not visible here lead wires in the outwardly guided cable 16 can be seen.

In Figur 2 sind die Kabeldurchführungen 10 und 11 im Detail deutlicher zu erkennen. Die Zuleitungen 6 und 7 sind hier in die Buchsen 12 und 13 aus einem nichtleitenden aber lötbaren keramischen Material, beispielsweise Alumiumoxid, geführt und am Ende der Buchsen 12 und 13 mit den Anschlussdrähten des äußeren Kabels 16 vorzugsweise auch durch Löten an den hier nur beispielswiese ausgeführten elektrischen Kopplungen 14 und 15 leitend verbunden. Insbesondere an der Kabeldurchführung 10 nach der Figur 2 ist erkennbar, dass die Buchse 12 aus dem nichtleitenden aber lötbaren keramischen Material über ein Lot 17 mit dem Aktorfuß 4 und über ein Lot 18 die Zuleitung 6 mit dem entsprechenden Anschlussdraht des äußeren Kabels 16 verbunden ist.In FIG. 2 the cable ducts 10 and 11 can be seen more clearly in detail. The leads 6 and 7 are here in the jacks 12 and 13 made of a non-conductive but solderable ceramic material, such as alumina, and at the end of the sockets 12 and 13 with the leads of the outer cable 16 preferably also by soldering to the here exemplary meadow executed electrical couplings 14 and 15 conductively connected. In particular, at the cable duct 10 after the FIG. 2 It can be seen that the bush 12 made of the nonconductive but solderable ceramic material is connected via a solder 17 to the actuator base 4 and via a solder 18 the supply line 6 to the corresponding connecting wire of the outer cable 16.

Gemäß einer weiteren hier nicht dargestellten Ausführungsform sind die Buchsen zylindrisch ausgeführt und in eine korrespondierende Stufenbohrung im metallischen Aktorfuß 4 eingefügt, wobei hier vor dem Einbringen der jeweiligen Buchse ein Lotring in die Stufenbohrung eingebracht werden kann, der bei dem Lötprozess die Lotzufuhr erleichtert.According to another embodiment, not shown here, the bushings are cylindrical and inserted into a corresponding stepped bore in the metallic actuator base 4, in which case a solder ring can be introduced into the stepped bore before the introduction of the respective bush, which facilitates the soldering in the soldering process.

Mit der Erfindung kann bei den gezeigten Ausführungsbeispielen der Aktorfuß 4 als metallisches Tragerbauteil den Piezoaktor 2 nach der Figur 1 mit einem hier nicht dargestellten Haltekörper verbinden und gewährleistet dabei die elektrische Anbindung des Piezoaktors 2 und dichtet diesen zugleich gegen den hydraulischen Kraftstoffdruck von ca. 2000 bar, der in dem Aktorraum des Piezoaktormoduls um die Anordnung 1 nach der Figur 1 herrscht, gegen die Umgebung ab.With the invention, in the embodiments shown, the actuator foot 4 as a metallic support member, the piezoelectric actuator 2 after the FIG. 1 Connect with a holding body, not shown here, thereby ensuring the electrical connection of the piezoelectric actuator 2 and seals it at the same time against the hydraulic fuel pressure of about 2000 bar, in the actuator chamber of the piezoelectric actuator to the arrangement 1 after the FIG. 1 prevails against the environment.

Der Aktorfuß 4 als metallisches Trägerbauteil muss vor der Oberflächenbearbeitung, in der Regel Schleifen, vergütet werden können, was mit der erfindungsgemäßen Einbringung der keramischen Buchsen 12 und 13 erreicht wird, wobei die Zuleitungen 6 und 7 als Ansteuerung der Piezoelemente 3 des keramischen Piezoaktors 2 positionsgenau geklemmt werden können und die Abdichtung zwischen den Buchsen 12 und 13 sowie zwischen den Buchsen 12 und 13 und dem Aktorfuß 4 über einen Standardlötprozess erfolgt.The actuator foot 4 as a metallic support member must be quenched before the surface treatment, usually grinding, which is achieved with the inventive introduction of the ceramic jacks 12 and 13, wherein the leads 6 and 7 as control of the piezoelectric elements 3 of the ceramic piezoelectric actuator 2 positionally accurate can be clamped and the seal between the sockets 12 and 13 and between the sockets 12 and 13 and the actuator base 4 via a standard brazing process.

Claims (7)

  1. Cable ducts (10, 11) for a piezo actuator module with a piezo actuator (2), which has piezo elements (3) arranged between an actuator head (4) and an actuator base (5), with cables (16) and leads (6, 7) for the electrical contacting of the piezo elements (3) running in an insulated manner in the metallic actuator head (4), characterized in that the cable ducts (10, 11) also have bushes (12, 13), which each consist of a solderable or weldable nonconducting material and the metallic conductors of the cable (16) and the leads (6, 7) are soldered or welded to one another on the outside with the metallic actuator head (4) and on the inside in the bushes (12, 13).
  2. Cable ducts according to Claim 1, characterized in that the bushes (12, 13) consist of a solderable ceramic material.
  3. Cable ducts according to Claim 2, characterized in that the bushes (12, 13) consist of aluminium oxide.
  4. Cable ducts according to Claim 1, 2 or 3, characterized in that the bushes (12, 13) are cylindrically formed and can be inserted into a corresponding stepped bore in the metallic actuator head (4).
  5. Cable ducts according to Claim 1, 2 or 3, characterized in that the bushes (12, 13) are conically formed and can be inserted into a corresponding conical bore in the metallic actuator head (4).
  6. Method for producing the cable ducts according to Claim 4, characterized in that a solder ring is introduced into the stepped bore before the introduction of the respective bush (12, 13).
  7. Use of a piezo actuator module with a cable duct (10, 11) according to one of the preceding claims, characterized in that the piezo actuator module is a component part of a piezo injector for a fuel injection system in an internal combustion engine.
EP20080102596 2007-03-19 2008-03-13 Cable duct for a piezo actuator module Expired - Fee Related EP1972778B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200710012921 DE102007012921A1 (en) 2007-03-19 2007-03-19 Cable bushings for a piezo actuator module

Publications (2)

Publication Number Publication Date
EP1972778A1 EP1972778A1 (en) 2008-09-24
EP1972778B1 true EP1972778B1 (en) 2009-11-18

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EP20080102596 Expired - Fee Related EP1972778B1 (en) 2007-03-19 2008-03-13 Cable duct for a piezo actuator module

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DE (2) DE102007012921A1 (en)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10139871B4 (en) 2001-08-14 2010-08-26 Robert Bosch Gmbh Valve for controlling fluids
DE102005039567A1 (en) * 2005-08-22 2007-03-01 Robert Bosch Gmbh Arrangement with a piezoelectric actuator and a method for its production
DE102005039550A1 (en) * 2005-08-22 2007-03-01 Robert Bosch Gmbh Arrangement with a piezoelectric actuator and a method for its production
DE102005039911A1 (en) * 2005-08-24 2007-03-08 Robert Bosch Gmbh Arrangement with a piezoelectric actuator
DE102006018916A1 (en) * 2006-04-24 2007-10-25 Siemens Ag Fluid e.g. fuel, injector`s metallic body for internal combustion engine of motor vehicle, has electrical conductors led through ceramic bodies that are fastened to recesses by hard solder joints, and grooves formed outside recesses

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EP1972778A1 (en) 2008-09-24
DE102007012921A1 (en) 2008-09-25
DE502008000186D1 (en) 2009-12-31

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