EP1929620A1 - Ensemble comportant un actionneur piezoelectrique et procede de fabrication dudit ensemble - Google Patents

Ensemble comportant un actionneur piezoelectrique et procede de fabrication dudit ensemble

Info

Publication number
EP1929620A1
EP1929620A1 EP06793308A EP06793308A EP1929620A1 EP 1929620 A1 EP1929620 A1 EP 1929620A1 EP 06793308 A EP06793308 A EP 06793308A EP 06793308 A EP06793308 A EP 06793308A EP 1929620 A1 EP1929620 A1 EP 1929620A1
Authority
EP
European Patent Office
Prior art keywords
contact elements
lines
piezoelectric element
piezoelectric
arrangement according
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Withdrawn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
EP06793308A
Other languages
German (de)
English (en)
Inventor
Rudolf Heinz
Dieter Kienzler
Udo Schaich
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 EP1929620A1 publication Critical patent/EP1929620A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/005—Arrangement of electrical wires and connections, e.g. wire harness, sockets, plugs; Arrangement of electronic control circuits in or on fuel injection apparatus
    • 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
    • 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

Definitions

  • the invention relates to an arrangement with a piezoelectric actuator, for example as a piezoelectric injector for actuating a mechanical component such as a valve or the like, and a method for its production according to the generic features of the main claim.
  • a piezoelectric actuator for example as a piezoelectric injector for actuating a mechanical component such as a valve or the like
  • Such an arrangement is for example advantageously used for controlling the stroke of a needle for fuel injection in a motor vehicle, both with a single-stage and with a two-stage translation.
  • a piezoelectric element can be used in such a way that, by utilizing the so-called piezoelectric effect, a control of the needle stroke of a valve or the like can be carried out.
  • the piezoelectric element is constructed of a material with a suitable crystal structure such that when an external electrical voltage is applied, a mechanical reaction is initiated. takes place on the piezoelectric element, which represents a pressure or train in a predetermined direction depending on the crystal structure and the contact areas of the electrical voltage.
  • Such piezoelectric actuators are suitable, for example, for applications in which lifting movements take place under high operating forces and high clock frequencies.
  • such a piezoelectric actuator is known from DE 100 26 005 A1, which can be used to control the nozzle needle in injectors for injecting fuel into the combustion chamber of an internal combustion engine.
  • a piezoelectric element constructed as a stack of several electrically coupled together piezoceramic layers, which is held under bias between two stops. Each piezoceramic layer is enclosed as a piezoelectric layer between two internal electrodes via which an electrical voltage can be applied from the outside. Because of this electrical voltage, the piezoceramic layers then each carry out small strokes in the direction of the potential gradient, which add up to the total stroke of the piezoelectric actuator. This total stroke is variable by the amount of voltage applied and can be transferred to a mechanical actuator.
  • a piezoelectric actuator is also described in EP 1 174 615 A3, in which a piezoelectric element is present as an actuator for the direct needle stroke control of an injection injector for an internal combustion engine. Between the piezoelectric element as an actuator and the needle sits only a coupler with a hydraulic ratio to the expansion compensation. With an activation of the piezoelectric element in this case the held under bias to the closure of the injection nozzle needle is moved away from the nozzle opening, as the needle directly translated follows the movement of the actuator.
  • the electrical connection of the piezoelectric element to an external voltage source is carried out by an extension of the outer electrodes through a foot portion of the piezoelectric actuator.
  • This extension can also be routed to a connector, so that they are thus contacted in a mechanically non-critical area.
  • the extensions may be electrically isolated by the actuator foot, e.g. made of steel, are guided, on which the piezoelectric element is applied or fixed.
  • the extensions for fixing and strain relief of the outer electrodes are held in a potting compound, which are in a recess of the actuator base, possibly surrounded by a molded part made of steel or polymer introduced.
  • the overall lengths must be adapted to the specific application.
  • the length of the supply line varies in particular between the actuator foot and the plug part in the region of the head part of the holding body for the piezoelectric actuator.
  • the contact elements for supplying the piezoelectric element with the electrical voltage are continued by means of a continuous wire to the plug part.
  • the known continuous wire is connected to a high-pressure-tight Glaseinschmelzung and must be adjusted in its length of the respective customer-specific length of the piezoelectric actuator, such as an injection injector. Since the wire is usually made of a material with low thermal expansion, such as NiFe, the poorly electrically conductive -A-
  • the invention is based on an arrangement described above with a piezoactuator having a multilayer structure of piezoelectric layers in a piezoelectric element, which are held in a holding body, wherein on the piezoelectric element a mutual contacting of internal electrodes with contact elements is present. Furthermore, supply wires are guided as electrical lines through a head part of the holding body to the contact elements. According to the invention, the electrical lines are guided over an adjustable in length connecting element through the head part of the holding body to the contact elements in an advantageous manner.
  • the connecting element consists of an electrically conductive sleeve in a predeterminable length, in which on one side the ends of the electrical lines of a plug part and on the other side, the ends of the lines as extensions of the contact elements can be introduced.
  • the lines leading to the contact elements in or on the piezoelectric element are embedded in a glass sealing in a high pressure-tight manner with respect to liquids, wherein the glass melting is preferably embedded in the region of the head part of the holding body. Glass fusion can be carried out more easily with the invention because there are no long wire ends, thus simplifying the handling, transport and assembly.
  • the inventive separation of the lines above the Glaseinschmelzonne can therefore be remedied by an additional connector, the disadvantage of continuous thin connection with a NiFe wire. It can be a simple length adjustment of the line to the Length of the piezoelectric actuator and a strain compensation are made.
  • the upper end of the line facing the plug part can moreover be produced from a freely selectable material, wherein this line leading to the plug part can also be formed from the sleeve into a flat pin.
  • the electrically conductive sleeve can be isolated by an insulating sleeve from the head part and it can still be arranged between the Glaseinschmelzung and the conductive sleeve, an additional insulating tube whose outer diameter is smaller than the outer diameter of the Glaseinschmelzung.
  • the sleeve may be made of a material having better electrical conductivity, e.g. Copper or brass, and made with greater thickness than the Ni-Fe wire.
  • a polarity and signal testing of the piezoelectric element and a test of high-pressure sealing in a first method step, a polarity and signal testing of the piezoelectric element and a test of high-pressure sealing and in a second process step, the connection of the lines between the plug part and the contact elements in the connecting element can be performed.
  • FIG. 1 shows a longitudinal section through a piezo injector with a piezoelectric actuator in a basic geometric structure according to the prior art
  • FIG. 2 shows a partial longitudinal section through an inventive embodiment of a piezoelectric actuator with internal contacting of internal electrodes of a piezoelectric element, in which the electrical conductors are guided by an outer plug through a head part of a holding body together with a Glaseinschmelzung
  • Figures 3a and 3b are schematic representations of different lengths of the head portion of a holding body for the piezoelectric element and correspondingly adapted sleeves for the lines and
  • Figure 4 and Figure 5 are each a detailed view of a sleeve for the ends of the lines to the plug and the contact element.
  • FIG. 1 shows a basic structure of a known single-stage piezoelectric injector 1 with a piezoactuator, which is also referred to below as injection injector due to its proposed application and can be used, for example, for direct needle lift control in the fuel injection system of an internal combustion engine.
  • a holding body 2 In the upper part of a holding body 2 is present, which can be adjusted in its geometric dimensions substantially to the specific site.
  • a plug part On the holding body 2 there is a plug part, not shown here, by means of which the electrical voltage for driving a piezo element 3 can be connected by means of a connector design which is also adapted specifically to the application.
  • the holding body 2 according to the figure 1 is in particular at the head part usually in its length Lo to the application-specific conditions, for example as a fuel injector on the internal combustion engine, adapt. This results in special features in the management of the electrical lines inside and also with respect to the contacts.
  • FIG. 2 shows a part of a piezoactuator 20 according to the invention in the assembled state.
  • a piezoelectric element 21 is present, in which internal electrodes 22 and 23 are provided with a reference numeral only by way of example, which in the stack structure of the piezoelectric element 21 are mutually supplied with electrical voltage via inner contact elements 24 and 25. Due to the potential gradient when a voltage is applied, the mechanical reaction in the piezoelectric layers 26 made of ceramic films between the internal electrodes 22 and 23, as explained in the introduction to the description, is effected.
  • the piezoelectric element 21 is still on a cover plate 27 made of ceramic and an actuator base 28 made of steel on the holding body 29 of the piezoelectric actuator 20, wherein the holding body 29 has a head portion 30, which has a fuel supply 31 and an electrical connection part 32.
  • the piezoelectric element 21 is sealed with respect to the fuel in the interior of the holding body 29 with an outer insulating layer 33.
  • feed wires are inserted insulated as lines 34 and 35, which are high pressure-tight for connection to the piezo element 21 are preferably pressed by means of a Glaseinschmelzung 36 and for connection to the contact elements 24 and 25 are contact connections 37 or 38 are present, which come to lie in each case in isolation or centering sleeves 39.
  • the lines 34 and 35 are continued in a conventional manner after the contact connections 37 and 38 as continuous wires to the connector part 32 not shown here in detail, the wire length then the required length Lo of the head portion 30 of the holding body 29th must be adjusted. Since the wire of leads 34 and 35, for example of NiFe, is relatively thin and poorly electrically conductive, the realization of a PIN terminal at the end of leads 34 and 35 is relatively difficult.
  • FIGS. 3 a and 3 b exemplary embodiments are shown in FIGS. 3 a and 3 b as well as in the detailed illustrations according to FIGS. 4 and 5, in which an application-specific length adaptation of the lines 34 and 35 in differently long head parts 29 can be recognized.
  • FIGS. 3 a and 3 b show exemplary embodiments in which an application-specific length adaptation of the lines 34 and 35 in differently long head parts 29 can be recognized.
  • FIGS. 3 a and 3 b shows a relatively short length L va ⁇ abei.
  • FIG. 3b shows a long head part 29 having a relatively large length L va ⁇ abe .
  • an electrically conductive sleeve 50 is present, for example made of copper, bronze or brass, by that with two-sided insertion of wires and a flexible plug-like connection can be made.
  • Such a plug-type connection can be seen in each case from Figure 4 and Figure 5, wherein the leads 34 and 35 are replaced by wires or pins 51 and 52, which are inserted into both sides of the sleeve 50 and thus produce the flexible plug-like connection ,
  • the lower 52 connected to the contact elements 24 or 25 pin 52 is located above a Glaseinschmelzung 53 in the head part 29 and above the Glaseinschmelzung 53, the pin 52 is guided in an insulating sleeve 54 until it opens into the sleeve 50.
  • the pin 51 can also be formed at the other end as a plug pin 55, for example as a flat pin.
  • an additional insulation tube 56 for example made of polymer or shrink tubing, is attached, the outer diameter of which is smaller than the glass melt 53.
  • the above-mentioned glass melting 53 serves as a high-pressure seal against the fluid pressure to the outside in the event of leakage of the piezoelectric element 21 or the weld 41 (see FIG.
  • the invention can be used to control the stroke of a fuel injection needle in a motor vehicle, both with a one-stage and a two-stage transmission.

Landscapes

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

Abstract

L'invention concerne un ensemble comportant un actionneur piézoélectrique, par exemple un injecteur piézoélectrique pour l'actionnement d'un composant mécanique, lequel ensemble présente une structure multicouche constituée de couches piézoélectriques (26) maintenues dans un corps de maintien (2 ; 29, 30) en tant qu'élément piézoélectrique (3 ; 21), des électrodes internes (22, 23) et des éléments de contact (24, 25) étant en contact mutuel sur cet élément piézoélectrique (3 ; 21), ainsi que des lignes électriques (34, 35) dirigées à travers une partie tête (30) du corps de maintien (29) vers les éléments de contact (24, 25). Ces lignes électriques sont dirigées à travers la partie tête (30) du corps de maintien (29) vers les éléments de contact (24, 25) par l'intermédiaire d'un élément de liaison (50, 51, 52) ajustable en longueur, cet élément de liaison étant constitué d'une douille électroconductrice (50) dont la longueur peut être prédéterminée et dans laquelle peuvent être insérées, d'un côté, les extrémités (51) des lignes électriques d'une partie de connecteur et, de l'autre, les extrémités (52) des lignes sous forme de prolongements des éléments de contact (24, 25).
EP06793308A 2005-09-22 2006-09-07 Ensemble comportant un actionneur piezoelectrique et procede de fabrication dudit ensemble Withdrawn EP1929620A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005045229A DE102005045229A1 (de) 2005-09-22 2005-09-22 Anordnung mit einem Piezoaktor und ein Verfahren zu dessen Herstellung
PCT/EP2006/066110 WO2007033909A1 (fr) 2005-09-22 2006-09-07 Ensemble comportant un actionneur piezoelectrique et procede de fabrication dudit ensemble

Publications (1)

Publication Number Publication Date
EP1929620A1 true EP1929620A1 (fr) 2008-06-11

Family

ID=37492214

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06793308A Withdrawn EP1929620A1 (fr) 2005-09-22 2006-09-07 Ensemble comportant un actionneur piezoelectrique et procede de fabrication dudit ensemble

Country Status (4)

Country Link
EP (1) EP1929620A1 (fr)
JP (1) JP2009509493A (fr)
DE (1) DE102005045229A1 (fr)
WO (1) WO2007033909A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8100346B2 (en) 2007-11-30 2012-01-24 Caterpillar Inc. Piezoelectric actuator with multi-function spring and device using same
EP2444650B1 (fr) * 2010-10-20 2015-12-23 Delphi International Operations Luxembourg S.à r.l. Injecteur de carburant amélioré
DE102014214018A1 (de) 2014-07-18 2016-01-21 Continental Automotive Gmbh Piezobauelement, Kontaktierungsbauelement zum elektrischen Kontaktieren eines Piezostapels und Verfahren zum Herstellen eines solchen Piezobauelements

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10205909B4 (de) * 2002-02-13 2005-11-10 Siemens Ag Dichtungselement für den Piezoaktor eines Kraftstoff-Einspritzventils
DE10253956A1 (de) * 2002-11-19 2004-06-24 Siemens Ag Piezoaktorkontaktierung für Einspritzventil und Verfahren zu dessen Herstellung
JP2004319967A (ja) * 2003-03-31 2004-11-11 Denso Corp 積層型圧電素子
DE10335019A1 (de) * 2003-07-31 2005-02-17 Robert Bosch Gmbh Piezoaktor

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2007033909A1 *

Also Published As

Publication number Publication date
DE102005045229A1 (de) 2007-03-29
JP2009509493A (ja) 2009-03-05
WO2007033909A1 (fr) 2007-03-29

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