EP1920529A2 - Dispositif comprenant un actionneur piezo-electrique et procede pour le produire - Google Patents

Dispositif comprenant un actionneur piezo-electrique et procede pour le produire

Info

Publication number
EP1920529A2
EP1920529A2 EP06819048A EP06819048A EP1920529A2 EP 1920529 A2 EP1920529 A2 EP 1920529A2 EP 06819048 A EP06819048 A EP 06819048A EP 06819048 A EP06819048 A EP 06819048A EP 1920529 A2 EP1920529 A2 EP 1920529A2
Authority
EP
European Patent Office
Prior art keywords
contact elements
lines
contact
arrangement according
piezoelectric element
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Withdrawn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
EP06819048A
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 EP1920529A2 publication Critical patent/EP1920529A2/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Withdrawn legal-status Critical Current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
    • 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
    • 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
    • H10N30/01—Manufacture or treatment
    • H10N30/06—Forming electrodes or interconnections, e.g. leads or terminals
    • 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 piezo injector or 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 piezo injector or for actuating a mechanical component such as a valve or the like
  • a piezoelectric element can be used so that by utilizing the so-called piezoelectric effect, a control of the needle stroke of a valve or the like can be made.
  • the piezoelectric element is constructed of a material having a suitable crystal structure such that when an external electrical voltage is applied, a mechanical reaction of the piezoelectric element takes place which, depending on the crystal structure and the contact areas of the electrical voltage, represents a pressure or tension in a predeterminable direction.
  • 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.
  • EP 1 174 615 A3 also describes a piezoelectric actuator or a piezoelectric injector in which a piezoelectric element is present as an actuator for the direct needle lifting control of an injection injector for an internal combustion engine. Between the piezo 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, the needle held under pretension to the closure of the injection nozzle is thereby deflected by the nozzle. moved away 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 invention is based on an arrangement described above with a piezoelectric actuator having a multi-layer structure of piezoelectric layers in a piezoelectric element and is held on a holding body, wherein the piezoelectric element is a mutual contacting of internal electrodes with contact elements. There are still supply wires as electrical -A-
  • lines embedded in the head part of the holding body are advantageously connectable via contact connections with the contact elements, wherein the contact connections are preferably in each case in a centering and / or insulating sleeve in the actuator base on the piezoelectric element after assembly of the piezoelectric actuator.
  • 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.
  • the contact elements are added by means of the contact connections to the lines in a first method step and in a second step, the piezoelectric element is pushed with the actuator base on the contact elements and then the Aktorfuß firmly connected to the head part of the holding body.
  • a test of the contact connections and the high-pressure seals can then be carried out in a simple manner before the first method step.
  • a polarity and signal testing of the piezoelectric element is preferably carried out beforehand.
  • connections of the lines with the contact elements can be produced for example by welding or soldering or by crimping the respectively opposite ends.
  • the ends of the lines and the contact elements can be compressed in an advantageous manner or directly butt joined together.
  • the ends of the leads and the contact elements may be overlapping with flats.
  • the ends of the lines and the contact elements can also be inserted into openings of a sleeve and then be connected by welding or soldering or by crimping.
  • the invention thus enables a high-pressure-tight connection of the parts of the piezoelectric actuator and at the same time a secure electrical connection of the electrical connections, which also, without having to apply the disadvantageous plug principle, achieved a gradual assembly and a stepwise examination of the function of the elements.
  • the high-pressure tight in the head part preferably introduced in a molten glass lines can be tested before the entire piezoelectric actuator assembly or the injection valve constructed therewith is mounted.
  • the welds or solder joints of the contact connections are initially easily accessible and electrically, mechanically or visually testable and a rework is possibly still possible. Also, possibly a length compensation depending on the selected type of contact connection is possible.
  • the piezoelectric element can still be used in another arrangement.
  • the invention is possible together with a contacting of the internal electrodes via contact elements lying inside the piezoelectric element, so that insulation can be easily applied to the outside of the piezoelectric element and no electrode wires protrude here.
  • the invention is also applicable with an external contact of the internal electrodes, if the necessary precautions are taken.
  • FIG. 1 shows a longitudinal section through a piezo injector with a piezoelectric actuator in a basic geometric structure according to the prior art with external contacting of the internal electrodes
  • FIG. 1 shows a longitudinal section through a piezo injector with a piezoelectric actuator in a basic geometric structure according to the prior art with external contacting of the internal electrodes
  • FIG. 2 shows a partial longitudinal section through an exemplary embodiment of a piezo injector with internal contacting, in which connection variants for internal contacting of the internal electrodes are indicated,
  • Figure 3 is a schematic diagram of possible connection forms when connecting the inner contacts
  • Figure 4 is a schematic representation with the inner contacts during assembly of the piezoelectric actuator.
  • the piezoinjector 1 shows a basic structure of a single-stage piezoelectric injector 1, in which a piezoelectric actuator for direct Nadelhub Kunststoffung a nozzle needle in the injection system for fuel in an internal combustion engine can be used.
  • the piezoinjector 1 has a holding body 2, which can be adapted in its geometric dimensions substantially to the specific location.
  • a plug part not shown here is provided, which can be connected with a likewise adapted specifically to the application plug design, the e- lectric voltage for driving a piezoelectric element 3 as part of a piezoelectric actuator inside the holding body 2.
  • the piezoelectric element 3 acts on an actuation, as described above, via a perpendicular here semi-mechanical arrangement with a coupler 8 on a nozzle needle 9 such that a release of a nozzle opening 10 can take place here.
  • a guided in the interior of the piezoelectric injector 1 through the interior of the holding body 2 fuel can thus be injected into the combustion chamber of an internal combustion engine, not shown here.
  • the piezoelectric layers of the piezoelectric element 3 are according to the figure 1 via an actuator base 11 at the top of a spherical sealing seat in the interior of the holding body 2, wherein the piezoelectric element 3 is pressed to effect a good sealing seat with a spring 12.
  • a high-pressure seal to an electrical connection space 13 is necessary here, through which the two electrical lines 4 and 5 are guided to the piezoelectric element 3.
  • FIG. 2 shows a part of a piezo injector 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 layers of the piezoelectric element 21 according to FIG. 2 furthermore lie on a ceramic cover plate 27 and an actuator base 28 made of steel on the holding body 29 of the piezoinjector 20, wherein the holding body 29 has a head part 30 which, on the one hand, has a fuel feed 31 and a electrical connection part 32 has.
  • 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 press-fitted for connection to the piezo element 21 in a high-pressure-tight manner, preferably by means of a glass seal 36, and contact connections 37 or 38 are provided for connection to the contact elements 24 and 25, each in isolation - or centering sleeves 39 come to rest.
  • FIG. 3a Some variants of the contact connections 37 or 38, for example between the line 25 and the feed wire 35, are shown by way of example in FIG.
  • FIG. 3a On the left in FIG. 3a there is shown a connection between compressed ends and on the right next to FIG. 3b between uncompressed ends, which can then be welded or soldered, for example.
  • the third example in Figure 3c shows flattened ends, which can then be welded or soldered and next to Figure 3d is shown a variant in which the end of the line 35 is compressed and provided with an inner bore into which the counterpart then also plugged in and can be welded or soldered.
  • the variant of Figure 3e shows a connection via a sleeve 40, to which the ends of the line 35 and the contact element 25 can be welded, soldered or crimped on both sides.
  • FIG. 4 schematically shows the assembly process during the attachment of the piezoelectric element 21 with the actuator base 28 to the head part 30 of the holding body 29.
  • the contact elements 24 and 25 are attached by means of the contact connections 38 and 37 (see Figures 2 and 3a to 3e).
  • These contact elements 24 and 25 may be, for example, electrically conductive brushes or consist of a corrugated or smooth wire which is mountable by means of a conductive adhesive.
  • this can be poled separately or also subjected to a large signal test, it being possible for example to use a demodulating and reusable brush electrode for this purpose. It is also conceivable that the contact elements 24 and 25 are pre-assembled in the piezoelectric element 21 except for residual pieces.
  • the piezoelectric element 21 with the actuator base 28 can now be pushed onto the contact elements 24 and 25 and, for example, connected to the head part 30 at welds 41 (FIG. 2).
  • the insulating or centering sleeves 39 which are also to be taken from FIG. 2, serve to center and torsion-fix the piezoelectric element 21 in the head part 30 in addition to the electrical insulation, these insulating or centering sleeves 39 also having different external diameters depending on the polarity so that the polarity is not reversed.
  • the invention can be used to control the fuel injection in a motor vehicle.

Landscapes

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

Abstract

La présente invention concerne un dispositif comprenant un actionneur piézo-électrique, par exemple pour actionner un composant mécanique, notamment sous forme d'injecteur piézo-électrique. Ce dispositif présente une structure multicouche de couches piézo-électriques (26) qui sont maintenues sous forme d'élément piézo-électrique (3;21) dans un corps de support (2;29,30). Une mise en contact interne mutuelle d'électrodes internes (22,23) avec des éléments de contact (24,25) est présente sur l'élément piézo-électrique (3;21). Des lignes électriques (34,35) traversent une partie de tête (30) du corps de support (29) jusqu'aux éléments de contact (24,25). Les lignes (34,35) fixement intégrées dans la partie de tête (30) peuvent être connectées aux éléments de contact (24,25) par l'intermédiaire de raccords de contact (37,38). Une fois l'injecteur piézo-électrique monté, ces raccords de contact (37,38) peuvent venir respectivement dans un manchon d'alignement et/ou d'isolation (39) dans la base de l'actionneur (28,27) pour reposer sur l'élément piézo-électrique (21).
EP06819048A 2005-08-22 2006-07-17 Dispositif comprenant un actionneur piezo-electrique et procede pour le produire Withdrawn EP1920529A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005039550A DE102005039550A1 (de) 2005-08-22 2005-08-22 Anordnung mit einem Piezoaktor und ein Verfahren zu dessen Herstellung
PCT/EP2006/064307 WO2007023034A2 (fr) 2005-08-22 2006-07-17 Dispositif comprenant un actionneur piezo-electrique et procede pour le produire

Publications (1)

Publication Number Publication Date
EP1920529A2 true EP1920529A2 (fr) 2008-05-14

Family

ID=37654724

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06819048A Withdrawn EP1920529A2 (fr) 2005-08-22 2006-07-17 Dispositif comprenant un actionneur piezo-electrique et procede pour le produire

Country Status (3)

Country Link
EP (1) EP1920529A2 (fr)
DE (1) DE102005039550A1 (fr)
WO (1) WO2007023034A2 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007012921A1 (de) * 2007-03-19 2008-09-25 Robert Bosch Gmbh Kabeldurchführungen für ein Piezoaktormodul

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4356268B2 (ja) * 2000-06-26 2009-11-04 株式会社デンソー 燃料噴射装置
DE10335019A1 (de) * 2003-07-31 2005-02-17 Robert Bosch Gmbh Piezoaktor
WO2005067070A1 (fr) * 2004-01-12 2005-07-21 Siemens Aktiengesellschaft Actionneur avec electrode de raccordement placee interieurement, et procede de production d'un tel actionneur
DE102004004706A1 (de) * 2004-01-30 2005-08-18 Robert Bosch Gmbh Kabeldurchführung und Brennstoffsystemteil mit einer Kabeldurchführung

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2007023034A3 *

Also Published As

Publication number Publication date
WO2007023034A3 (fr) 2007-04-19
DE102005039550A1 (de) 2007-03-01
WO2007023034A2 (fr) 2007-03-01

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