EP1763901A1 - Actionneur piezoelectrique - Google Patents

Actionneur piezoelectrique

Info

Publication number
EP1763901A1
EP1763901A1 EP05733620A EP05733620A EP1763901A1 EP 1763901 A1 EP1763901 A1 EP 1763901A1 EP 05733620 A EP05733620 A EP 05733620A EP 05733620 A EP05733620 A EP 05733620A EP 1763901 A1 EP1763901 A1 EP 1763901A1
Authority
EP
European Patent Office
Prior art keywords
piezoelectric actuator
head
internal electrodes
foot
contact
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Withdrawn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
EP05733620A
Other languages
German (de)
English (en)
Inventor
Ulrich Schoor
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 EP1763901A1 publication Critical patent/EP1763901A1/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Withdrawn legal-status Critical Current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
    • H10N30/871—Single-layered electrodes of multilayer piezoelectric or electrostrictive devices, e.g. internal electrodes
    • 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
    • H10N30/50—Piezoelectric or electrostrictive devices having a stacked or multilayer structure
    • 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
    • H10N30/88—Mounts; Supports; Enclosures; Casings
    • H10N30/883—Additional insulation means preventing electrical, physical or chemical damage, e.g. protective coatings

Definitions

  • the invention relates to a piezoelectric actuator, for example for actuating a mechanical component, according to the generic features of the main claim.
  • a piezo element for controlling the needle stroke of a valve or the like can be constructed from a material having a suitable crystal structure.
  • a mechanical reaction of the piezoelectric element takes place, which, depending on the crystal structure and the contact regions of the electrical voltage, represents a pressure or tension in a predeterminable direction.
  • piezoactuators can be used to construct actuators, for example for the drive of switching valves in fuel injection systems in motor vehicles.
  • the voltage or charge-controlled deflection of the piezoelectric actuator is used to position a Used control valve, which in turn controls the stroke of a Düsen ⁇ needle.
  • this piezoelectric actuator takes place here in several layers of stacked metallized piezoceramics so-called multilayer actuator.
  • the layers inner electrodes are present, which are e.g. be applied with a printing process, and there are notes ⁇ electrodes available, via which the electrical voltage is applied.
  • a typical method for producing such layers is in the film casting technique.
  • the individual layers are metallized and stacked one above the other to produce the internal electrodes, the piezo effect then having an effect between two layers with internal electrodes of different polarity.
  • piezoelectric actuators are provided with internal electrodes which, on the entire broad side, are provided on one of four sides, a retracted, i. have buried inner electrode here. On all other sides, the inner electrode extends to the edge of the ceramic to the outside.
  • Piezoactuators are also known whose internal electrodes are retracted on all sides, with the exception of the contact strip on the outside of the piezoactuator. These arrangements can have different contacting zones, e.g. on a surface or over a corner.
  • these known piezoelectric actuators have passive head and foot parts which are not provided with internal electrodes for assembly in corresponding actuator arrangements. This means that special guiding or fitting _ o _
  • NEN be provided and it is here a cover or an insulating layer necessary, which may be easily damaged.
  • the piezoactuator known from the prior art is provided with a multilayer structure of piezoelectric layers consisting of a passive region with or without internal electrodes and a piezoelectrically active region with contacted internal electrodes arranged between the layers.
  • the piezoelectric actuator In the active region, the piezoelectric actuator has a contacting of the inner electrodes that changes from layer to layer, for application of an electrical voltage.
  • the piezoelectric actuator is actively constructed with contacted inner electrodes in an advantageous manner, including a head and / or foot region, wherein the internal electrodes in the head and / or foot region, however, except for a minimal contact zone to the respective external contact in difference to the central active area, fully buried.
  • piezoelectric actuators are advantageous whose active range extends from the head to the foot over the entire piezoelectric actuator, thus eliminating guide or fitting zones in the foot and optionally in the head region.
  • active areas with internal electrodes routed to the outside in a customary manner must be covered in an electrically insulating manner in order to prevent surface conduction or creep.
  • Coating compositions for example silicone resins or elastomers or other insulating materials, lacquers or coatings, are used here in general are sensitive to mechanical damage during manufacture and further processing.
  • the embodiment according to the invention of a completely active piezoactuator does not require a cover with an insulating layer in the fitting or joining region at the top or bottom.
  • an advantageous combination of different burial of the internal electrodes in the layer structure of the piezoactuator is proposed partially buried internal electrodes in the central free area allow unhindered stretching and in the Fü ⁇ area on the head and / or foot additional layers can be activated with almost fully buried internal electrodes.
  • FIG. 1 shows a schematic view of a piezoactuator with a head and foot region in an overall active construction
  • FIG. 2 shows a detail view of a layer structure in the central free area of the piezoelectric actuator with partially buried internal electrodes
  • FIG Figure 3 shows a detailed view of a layer structure in the head or foot of the piezoelectric actuator with almost fully buried internal electrodes.
  • FIG. 1 schematically shows a piezoactuator 1 which, in a manner known per se, consists of piezo layers of a ceramic material, e.g. So-called green sheets, is constructed with a geeigne ⁇ th crystal structure, so that taking advantage of the so-called piezoelectric effect when applying a äuße ⁇ Ren electrical DC voltage to internal electrodes via externally contacted electrodes, a mechanical reaction of the piezoelectric actuator 1 takes place.
  • a piezoactuator 1 which, in a manner known per se, consists of piezo layers of a ceramic material, e.g. So-called green sheets, is constructed with a geeigne ⁇ th crystal structure, so that taking advantage of the so-called piezoelectric effect when applying a äuße ⁇ Ren electrical DC voltage to internal electrodes via externally contacted electrodes, a mechanical reaction of the piezoelectric actuator 1 takes place.
  • the piezoactuator 1 is constructed overall from such piezoelectrically active regions and specifically from a central free area 2 and a head area 3 and a foot area 4, the head and / or foot area 3, 4 in particular for the mechanical holding of the piezoelectric actuator 1 serve.
  • Figure 2 shows the structure of a piezoelectric layer in the central region 2 of Figure 1 with a Keramik ⁇ layer 5 and one of the ceramic layer 5 on the right edge covered inner electrode 6, which has a externally attached to the piezoelectric actuator 1 contact 7 with a pole of a Voltage is supplied.
  • the inner electrode 6 is covered on the left edge of the layer structure not only by the ceramic layer 5 but also by the overlying inner electrode 8, which is supplied with the other pole of the voltage via an outer contact 9. Inlin ken part of the layer structure, the non-visible edge of the inner electrode 6 is shown in dashed lines.
  • the non-contacted edge of the inner electrode 6 in the left-hand part and the non-contacted edge of the inner electrode 8 in the right-hand part are covered or thus partly buried.
  • an insulating layer On the sides 10 and 11 of the piezoelectric actuator 1 to the outer cover is an insulating layer,. e.g. made of silicone resin or elastomers.
  • the structure of the active region 2 consists of the hitherto customary construction with internal electrodes, which are pulled back only on one side and thus enable the greatest possible elongation.
  • the structure of the piezoactuator 1 can, as shown, be rectangular or even with a beveled contour at the corners.
  • FIG. 3 shows the construction of a piezoelectric layer with a ceramic layer 12 in the head or foot region 3 or 4 according to FIG.
  • an inner electrode 13 is connected via a relatively small contact zone 14 with the outside of the piezoelectric actuator 1 attached contact 7.
  • the underlying inner electrode 15 can be seen in the left-hand part of the piezoelectric layer, which likewise is connected via a relatively small contact zone 16 to the contacting 9 provided on the outside of the piezoelectric actuator 1.
  • the position of the contact zones 14, 16 can lie centrally on the side of the piezoactuator 1 or can also be offset on both sides or only on one side from the center.

Landscapes

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

Abstract

L'invention concerne un actionneur piézoélectrique, par exemple, pour la commande d'un composant mécanique, ledit actionneur (1) comprenant une pluralité de couches piézoélectriques d'au moins un domaine actif piézoélectriquement (2), ainsi que des électrodes intérieures (6, 8, 13, 15) insérées entre ces couches, lesdites électrodes étant sollicitées alternativement par une tension électrique de polarité différente. L'invention est caractérisée en ce que l'actionneur piézoélectrique (1) est construit actif, y compris sa zone de tête et/ou sa zone de pied (3, 4), et en ce que les électrodes intérieures (13, 15) sont complètement enfouies dans la zone de tête et/ou de pied, à l'exception d'une zone de contact minimale (14, 16) pour les contacts respectifs extérieurs (7, 9).
EP05733620A 2004-06-30 2005-04-25 Actionneur piezoelectrique Withdrawn EP1763901A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004031596A DE102004031596A1 (de) 2004-06-30 2004-06-30 Piezoaktor
PCT/EP2005/051832 WO2006003039A1 (fr) 2004-06-30 2005-04-25 Actionneur piezoelectrique

Publications (1)

Publication Number Publication Date
EP1763901A1 true EP1763901A1 (fr) 2007-03-21

Family

ID=34964562

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05733620A Withdrawn EP1763901A1 (fr) 2004-06-30 2005-04-25 Actionneur piezoelectrique

Country Status (6)

Country Link
US (1) US20080048528A1 (fr)
EP (1) EP1763901A1 (fr)
JP (1) JP2008504703A (fr)
CN (1) CN1977402A (fr)
DE (1) DE102004031596A1 (fr)
WO (1) WO2006003039A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107924988A (zh) * 2015-08-26 2018-04-17 陶瓷技术有限责任公司 耐湿气的保护层
US11320493B2 (en) 2017-07-07 2022-05-03 Siemens Energy Global GmbH & Co. KG Electric short-circuit device

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4201937C2 (de) * 1991-01-25 1997-05-22 Murata Manufacturing Co Piezoelektrisches laminiertes Stellglied
JPH0730165A (ja) * 1993-07-12 1995-01-31 Murata Mfg Co Ltd 積層型圧電体素子
DE19615694C1 (de) * 1996-04-19 1997-07-03 Siemens Ag Monolithischer Vielschicht-Piezoaktor und Verfahren zur Herstellung
DE19856201A1 (de) * 1998-12-05 2000-06-15 Bosch Gmbh Robert Piezoelektrischer Aktor
DE10025998A1 (de) * 2000-05-25 2001-12-06 Bosch Gmbh Robert Piezoaktor

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2006003039A1 *

Also Published As

Publication number Publication date
WO2006003039A1 (fr) 2006-01-12
JP2008504703A (ja) 2008-02-14
CN1977402A (zh) 2007-06-06
US20080048528A1 (en) 2008-02-28
DE102004031596A1 (de) 2006-02-09

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