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EP1230688A1 - Actionneur piezo - Google Patents

Actionneur piezo

Info

Publication number
EP1230688A1
EP1230688A1 EP01931409A EP01931409A EP1230688A1 EP 1230688 A1 EP1230688 A1 EP 1230688A1 EP 01931409 A EP01931409 A EP 01931409A EP 01931409 A EP01931409 A EP 01931409A EP 1230688 A1 EP1230688 A1 EP 1230688A1
Authority
EP
European Patent Office
Prior art keywords
piezo actuator
electrodes
extensions
actuator according
outer electrodes
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.)
Withdrawn
Application number
EP01931409A
Other languages
German (de)
English (en)
Inventor
Rudolf Heinz
Bertram Sugg
Steffen Jung
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1230688A1 publication Critical patent/EP1230688A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N30/00—Piezoelectric or electrostrictive devices
    • H10N30/80—Constructional details
    • H10N30/87—Electrodes or interconnections, e.g. leads or terminals
    • H10N30/872—Interconnections, e.g. connection electrodes of multilayer piezoelectric or electrostrictive devices
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
    • H02N2/00—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N30/00—Piezoelectric or electrostrictive devices
    • H10N30/80—Constructional details
    • H10N30/87—Electrodes or interconnections, e.g. leads or terminals
    • H10N30/875—Further connection or lead arrangements, e.g. flexible wiring boards, terminal pins
    • 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
    • F02M2200/21—Fuel-injection apparatus with piezoelectric or magnetostrictive elements

Definitions

  • the invention relates to a piezo actuator, for example for actuating a mechanical component such as a valve or the like, according to the generic features of the main claim.
  • a piezo element can be constructed from a material with a suitable crystal structure by using the so-called piezo effect.
  • the piezoelectric element reacts mechanically, which, depending on the crystal structure and the contact areas of the electrical voltage, represents a push or pull in a predeterminable direction.
  • This piezo actuator can be constructed in several layers (multilayer actuators), the electrodes via which the electrical voltage is applied being arranged between the layers. W
  • Such piezo actuators can be provided, for example, for driving switching valves in fuel injection systems in motor vehicles.
  • particular care must be taken to ensure that mechanical stresses in the layer structure also do not cause any troublesome cracks in the area of the outer connection electrodes. Since the inner electrodes contacted in each case on one side are integrated into the layer structure in the manner of a comb, the electrodes which follow one another in the direction of the layer structure must be contacted alternately on opposite sides.
  • the piezo actuator described at the outset which can be used, for example, to actuate a mechanical component, is advantageously designed in such a way that at least one layer of the respective outer electrode is constructed in a mesh-like or fabric-like manner on a respective side surface and is contacted at least in points with the respective inner electrodes.
  • the mesh-like or fabric-like outer electrodes are extended over the multilayer structure of the piezo layers in such a way that the Extensions the supply of electrical voltage via appropriate connections.
  • the invention advantageously achieves that the connection to the extension of the outer electrode produces an improved and mechanically more robust contact.
  • the adhesion of the electrodes to the piezo actuator is very low, so that even small forces can cause the external electrode to peel off the piezo actuator.
  • the number of electrical connections required in the area of the multilayer structure can then be reduced.
  • the outer electrodes are extended beyond the piezo actuator foot, ideally up to the plug, they can be contacted in a non-critical area. On the one hand, this enables cost-effective production, on the other hand, the process and failure risk is reduced at this point. It is also advantageous that there is also no need for an additional inactive area on the multilayer structure for contacting, which would otherwise be necessary, as a result of which a shorter overall length is made possible and further costs can be saved.
  • the extensions are electrically insulated through the foot part, for example made of steel or Al 2 O 3 , of the piezo actuator to which the multilayer structure of the piezo layers is attached. It is also advantageous here if the extensions for fixing and for strain relief of the outer electrodes are held in a casting compound which is in a recess of the foot part, possibly surrounded by a molded part made of steel or polymer.
  • the extensions can also be advantageously implemented in that the outer electrodes are tapered in the area of the extensions. Furthermore, the outer electrodes can also be folded or rolled in the area of the extensions.
  • the mesh-like or fabric-like outer electrodes can consist of crossed horizontally and vertically laid wires or wires which are laid at an angle of 45 °, which are in contact with one another by copper-plating or tin-plating.
  • FIG. 1 shows a section through a piezo actuator with a multilayer structure of layers of pizza ceramic and internal electrodes and a mesh-like external electrode extended by a base part;
  • Figure 2 shows a section on the line AA in the embodiment of Figure 1;
  • Figure 3 shows a detail section in the area of the passage of the extended outer electrode through the foot part;
  • FIGS. 1 to 3 shows a modification of the example according to FIGS. 1 to 3 with an additional molded part in the area of the extensions;
  • FIG. 5 shows a modification of the preceding examples with an outer electrode tapering in the extension
  • FIG. 6 shows an embodiment with an outer electrode folded in the extension
  • Figure 7 shows an embodiment with an outer electrode rolled in the extension
  • Figure 10 shows a detail section through the copper-plated or tinned wires of the mesh or fabric-like outer electrode.
  • piezo actuator 1 which is constructed in a manner known per se from piezo foils of a ceramic material with a suitable crystal structure, so that using the so-called piezo effect when an external electrical voltage is applied to internal electrodes 2 and 3, a mechanical reaction of the piezo actuator 1 takes place in the axial direction via external electrodes 4 and 5.
  • the piezo actuator is firmly embedded in a housing 7, for example the housing of an injection valve for motor vehicles, via a foot part 6.
  • the outer electrodes 4 and 5 have extensions 8 and 9, at the lower end of which an electrical connection for a power supply can be attached.
  • the extensions 8 and 9 are electrically insulated, for example by means of a shrink tube 10.
  • FIG. 3 shows the area in which the extensions 8 or 9 are carried out in detail using an exemplary embodiment.
  • FIG. 4 shows a modification for fixing and for strain relief of the outer electrodes 4 and 5 or the extensions 8 and 9 with a molded part 13 located in the base part 6, into which the casting compound 12 is inserted.
  • FIGS. 5 to 7 Different exemplary embodiments of the electrode extensions 8 and 9 are shown in FIGS. 5 to 7. According to FIG. 5, the extensions 8 and 9 are only tapered, which can also be seen from the cross section of the extension 9 shown below.
  • FIG. 6 shows an extension 9 that is folded and
  • FIG. 7 shows an extension 9 that is rolled, which in turn can be seen from the cross sections of the extension 9 drawn below.
  • FIG. 8 shows a network-like structure of the outer electrode 4 or 5 with wires 14 and 15 running horizontally and vertically
  • FIG. 9 shows a comparable structure with wires 14 and 15 inclined at 45 °.

Landscapes

  • Fuel-Injection Apparatus (AREA)
  • General Electrical Machinery Utilizing Piezoelectricity, Electrostriction Or Magnetostriction (AREA)

Abstract

L'invention concerne un actionneur piézo, utilisé, par exemple, pour l'actionnement d'un composant mécanique, qui présente une structure stratifiée comportant des couches piézo entre lesquelles sont disposées des électrodes intérieures (2, 3) et des contacts latéraux mutuels reliant les électrodes intérieures (2, 3) par l'intermédiaire d'électrodes extérieures (4, 5). Les électrodes extérieures (4, 5) sont réparties, à la façon d'un réseau ou d'un tissu, sur chaque face latérale et mises en contact, au moins ponctuellement, avec les électrodes intérieures (2, 3) correspondantes. Les électrodes extérieures (4, 5) sont prolongées au-delà de la structure stratifiée constituée des couches piézo, de telle sorte que l'alimentation en tension électrique se fait au niveau de leur prolongement (8, 9).
EP01931409A 2000-05-25 2001-04-05 Actionneur piezo Withdrawn EP1230688A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10026005 2000-05-25
DE2000126005 DE10026005B4 (de) 2000-05-25 2000-05-25 Piezoaktor
PCT/DE2001/001328 WO2001091199A1 (fr) 2000-05-25 2001-04-05 Actionneur piezo

Publications (1)

Publication Number Publication Date
EP1230688A1 true EP1230688A1 (fr) 2002-08-14

Family

ID=7643584

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01931409A Withdrawn EP1230688A1 (fr) 2000-05-25 2001-04-05 Actionneur piezo

Country Status (6)

Country Link
US (1) US20020135275A1 (fr)
EP (1) EP1230688A1 (fr)
KR (1) KR20020024309A (fr)
CZ (1) CZ2002196A3 (fr)
DE (1) DE10026005B4 (fr)
WO (1) WO2001091199A1 (fr)

Families Citing this family (33)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10259949A1 (de) 2002-12-20 2004-07-01 Robert Bosch Gmbh Piezoaktor
DE102005039548A1 (de) 2005-08-22 2007-03-01 Robert Bosch Gmbh Piezoaktor mit einer Steckverbindung
DE102005039567A1 (de) 2005-08-22 2007-03-01 Robert Bosch Gmbh Anordnung mit einem Piezoaktor und ein Verfahren zu dessen Herstellung
DE102005039911A1 (de) * 2005-08-24 2007-03-08 Robert Bosch Gmbh Anordnung mit einem Piezoaktor
DE102005046122A1 (de) * 2005-09-27 2007-03-29 Robert Bosch Gmbh Brennstoffeinspritzventil
DE102006026643A1 (de) 2006-06-08 2007-12-13 Robert Bosch Gmbh Piezoelekterischer Aktor
DE102006045663A1 (de) 2006-09-27 2008-04-03 Robert Bosch Gmbh Piezoaktor mit einer Ummantelung, zur Anordnung in einem Piezoinjektor
DE102006051325A1 (de) 2006-10-31 2008-05-08 Robert Bosch Gmbh Anordnung eines Piezoaktors in einer Hülse eines Piezoaktormoduls
DE102007001566A1 (de) 2007-01-10 2008-07-17 Robert Bosch Gmbh Verfahren zur Isolierung des aktiven Bereichs eines Piezoaktors und Piezoaktor
DE102007001563A1 (de) 2007-01-10 2008-07-17 Robert Bosch Gmbh Piezoaktor mit zwischen einem Aktorkopf und einem Aktorfuß eingespannten Piezoelementen
DE102007004552A1 (de) 2007-01-30 2008-07-31 Robert Bosch Gmbh Verfahren zur Herstellung eines Piezoaktormoduls mit einem Schutzschichtsystem
DE102007004559B4 (de) 2007-01-30 2020-02-27 Robert Bosch Gmbh Piezoaktormodul oder Piezoaktor mit einem ummantelnden Schutzschichtsystem und Verfahren zur Herstellung eines solchen Schutzschichtsystems
KR20080093281A (ko) * 2007-04-16 2008-10-21 주식회사 메디슨 초음파 진단용 프로브
DE102007040509A1 (de) 2007-08-28 2009-03-05 Robert Bosch Gmbh Piezoaktormodul mit einer Umhüllung des Piezoaktors und ein Verfahren zu dessen Herstellung
DE102007042224A1 (de) 2007-09-05 2009-03-12 Robert Bosch Gmbh Piezoaktormodul mit mehreren untereinander verbundenen Piezoaktoren
DE102007044751A1 (de) 2007-09-19 2009-04-09 Robert Bosch Gmbh Piezoaktormodul mit mehreren Piezoaktoren
DE102007046315A1 (de) 2007-09-27 2009-04-02 Robert Bosch Gmbh Piezoaktormodul mit mehreren untereinander verbundenen Piezoaktoren und ein Verfahren zu dessen Herstellung
DE102007046314A1 (de) 2007-09-27 2009-04-02 Robert Bosch Gmbh Piezoaktormodul mit mehreren untereinander verbundenen Piezoaktoren und ein Verfahren zu dessen Herstellung
DE102007056553A1 (de) 2007-11-23 2009-05-28 Robert Bosch Gmbh Verfahren zur Herstellung eines Piezoaktormoduls mit einer Umhüllung und ein so hergestelltes Piezoaktormodul
DE102007060052A1 (de) 2007-12-13 2009-06-18 Robert Bosch Gmbh Anordnung mit einem Piezoaktor mit mehreren Aktiv- und/oder zusätzlichen Sensorbereichen
DE102008003840A1 (de) 2008-01-10 2009-07-16 Robert Bosch Gmbh Piezoaktor mit flexiblen Außenelektroden
DE102008004227A1 (de) 2008-01-14 2009-07-16 Robert Bosch Gmbh Piezoaktormodul mit mehreren Piezoaktoren und ein Verfahren zu dessen Herstellung
WO2009104310A1 (fr) * 2008-02-18 2009-08-27 セイコーインスツル株式会社 Procédé de fabrication d'oscillateur piézoélectrique, oscillateur piézoélectrique, oscillateur, appareil électronique, et horloge à commande électronique
DE102008062021A1 (de) * 2008-08-18 2010-03-04 Epcos Ag Piezoaktor in Vielschichtbauweise
DE102008055119A1 (de) 2008-12-23 2010-07-01 Robert Bosch Gmbh Piezoinjektor
DE102009029213B4 (de) 2009-09-04 2017-03-30 Robert Bosch Gmbh Anordnung mit einem Aktor
DE102010022925B4 (de) 2010-06-07 2019-03-07 Tdk Electronics Ag Piezoelektrisches Vielschichtbauelement und Verfahren zur Ausbildung einer Außenelektrode bei einem piezoelektrischen Vielschichtbauelement
JP6017937B2 (ja) * 2012-11-28 2016-11-02 京セラ株式会社 積層型圧電素子およびこれを備えた噴射装置ならびに燃料噴射システム
JP6062728B2 (ja) * 2012-11-30 2017-01-18 京セラ株式会社 積層型圧電素子およびこれを備えた噴射装置ならびに燃料噴射システム
DE102013106223A1 (de) * 2013-06-14 2014-12-18 Epcos Ag Vielschichtbauelement mit einer Außenkontaktierung, einer Weiterkontaktierung und einem Verbindungselement
JP6252678B2 (ja) * 2014-07-04 2017-12-27 株式会社村田製作所 圧電センサおよび圧電素子
DE102015213003A1 (de) * 2015-07-10 2017-01-12 Robert Bosch Gmbh Piezoaktormodul und Piezoinjektor
DE102020113700B4 (de) 2020-05-20 2024-06-06 Deutsches Zentrum für Luft- und Raumfahrt e.V. Piezoelektrisches Funktionsnetzwerk

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DE3223801A1 (de) * 1982-06-25 1983-12-29 Siemens AG, 1000 Berlin und 8000 München Verfahren zur herstellung eines piezoelektrischen stellgliedes
DE3330538A1 (de) * 1983-08-24 1985-03-14 Siemens AG, 1000 Berlin und 8000 München Piezoelektrisches stellglied
JPH02266578A (ja) * 1989-04-06 1990-10-31 Nec Corp 電歪効果素子
DE19648545B4 (de) * 1996-11-25 2009-05-07 Ceramtec Ag Monolithischer Vielschichtaktor mit Außenelektroden
DE19753930A1 (de) * 1997-12-05 1999-06-10 Ceramtec Ag Verfahren zur Anbringung von Außenelektroden an Festkörperaktoren
DE19909452C1 (de) * 1999-03-04 2000-03-23 Bosch Gmbh Robert Piezoelektrischer Aktor
DE19928176A1 (de) * 1999-06-19 2001-01-04 Bosch Gmbh Robert Piezoaktor

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Title
See references of WO0191199A1 *

Also Published As

Publication number Publication date
WO2001091199A1 (fr) 2001-11-29
CZ2002196A3 (cs) 2002-07-17
KR20020024309A (ko) 2002-03-29
DE10026005A1 (de) 2001-12-06
DE10026005B4 (de) 2004-07-08
US20020135275A1 (en) 2002-09-26

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