EP1920477A1 - Ensemble comprenant un actionneur piezoelectrique - Google Patents

Ensemble comprenant un actionneur piezoelectrique

Info

Publication number
EP1920477A1
EP1920477A1 EP06777876A EP06777876A EP1920477A1 EP 1920477 A1 EP1920477 A1 EP 1920477A1 EP 06777876 A EP06777876 A EP 06777876A EP 06777876 A EP06777876 A EP 06777876A EP 1920477 A1 EP1920477 A1 EP 1920477A1
Authority
EP
European Patent Office
Prior art keywords
lines
arrangement according
actuator
piezoelectric
actuator base
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Withdrawn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
EP06777876A
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 EP1920477A1 publication Critical patent/EP1920477A1/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Withdrawn legal-status Critical Current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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/0014—Valves characterised by the valve actuating means
    • F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
    • F02M63/0026—Valves characterised by the valve actuating means electrical, e.g. using solenoid using piezoelectric or magnetostrictive actuators
    • 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
    • H10N30/80—Constructional details
    • H10N30/88—Mounts; Supports; Enclosures; Casings
    • 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 or for actuating a mechanical component such as a valve or the like, with an electrical connection for the control of a piezoelectric element via a foot of the piezoelectric actuator according to the generic features of the main claim.
  • a piezoelectric actuator for example as a piezoelectric injector or for actuating a mechanical component such as a valve or the like, with an electrical connection for the control of a piezoelectric element via a foot of the piezoelectric actuator according to the generic features of the main claim.
  • 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 upon application of an external electrical voltage, a mechanical reaction of the piezoelectric element takes place, which represents a pressure or tension in a predeterminable direction as a function of the crystal structure and the contact regions 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 piezoactuator is known from DE 100 26 005 A1, which is used to control the nozzle needle in injectors for injecting fuel into the combustion chamber of an internal combustion engine. that can.
  • 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 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 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 achieved by an extension of the outer electrodes through a foot portion of the piezoelectric element.
  • This extension can also be routed to a connector, so that they are thus contacted in a mechanically non-critical area.
  • the extensions can thereby be electrically isolated by the actuator base, for example made of steel, 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 a piezoelectric actuator described above, which has a multi-layer structure of piezoelectric layers of 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.
  • the lines are guided in an area of the actuator base to an accessible from outside of the actuator base, lying in a recess of the Aktorfußes connection point, at the opposite ends of the lines in an advantageous manner electrically and mechanically connect.
  • 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.
  • connection point is located in a recess of the actuator base, which is formed as a groove or in another contour produced by sintering, grinding or a suitable machining to expose the connection point.
  • the actuator foot can be made of an electrically insulating and high-pressure-tight ceramic part and a connecting part serving for engagement with the housing of the piezoelectric actuator, preferably made of metal, in a particularly advantageous manner.
  • the lines can be performed in an Anbindeteil in an insulation and in the ceramic part in a Glaseinschmelzung or soldering.
  • the ceramic actuator base can then simultaneously take over the sealing function by glass melted or soldered directly into the ceramic.
  • the high pressure seal can also be placed at any time in the tether or other components, with conventional Glaseinschmelzonne can be used depending on the space available.
  • the actuator base also in the region of the connection point of a single metal part, preferably steel.
  • the lines are here in the actuator base in an insulation, preferably in a ceramic tube or insert, and are encapsulated with an insulation, preferably ceramic kit.
  • the piezoelectric elements described above also require a high precision of the connecting parts to the actuator housing, especially in terms of flatness, roughness, parallelism and rigidity of the contact point. This can not be achieved by the previously used slotted components, so that additional components, such as platelets, inserts, etc., would then be necessary.
  • additional components such as platelets, inserts, etc.
  • the guidance or positioning of these additional components in the component assembly is very complex and expensive in terms of a desired mass production.
  • connection of the line ends can advantageously take place in that at least one end of the line is pre-stamped by means of a spoons, cones, u-shaped or other contour and the other end then comes to rest safely in this contour for a subsequent connection process in the small space accurate positioning is of great importance.
  • Welding, resistance welding, soldering, crimping, flanging or a combination of these can be considered as simple joining processes.
  • connection point It is also advantageous if the recesses for receiving the connection point have a contour for receiving a sealing plug.
  • the upcoming pressure of the fuel in a common-rail system supports the system and the tightness of the sealing plug in the actuator base.
  • the connection point can be injected electrically insulated at any time with plastic or ceramic kit
  • the recesses can be closed at the connection point, for example, in a simple manner by means of ceramic, ceramic sleeves, ceramic kit, plastic sealing plug or Kunststoffumspritzept for electrical insulation.
  • the lines in the actuator base can on the one hand angled outwards to the junction and opposite angled back again be guided or on the other hand just straight to the junction and also straight on.
  • FIG. 2 shows a partial section through an actuator base with an electrical contact of electrodes on the piezoelectric element in a piezoelectric actuator according to the figure 1 as prior art
  • FIG. 3 shows a partial section through an inventive connection point of the lines for contacting the internal electrodes of the piezoelectric element with angled cable routing
  • 5a, 5b, 6a, 6b, 7a, 7b and 8a, 8b are schematic views of embossments of the lines at the connection points
  • Figure 11a, 11b and 11b cross-sections in the region of the junction of the lines in a Aktorfuß made of metal and
  • Figures 12a, 12b and 12b are longitudinal sections in the region of the junction of the lines in a Aktorfuß made of metal.
  • FIG. 1 shows a basic structure of an arrangement as a single-stage piezo injector 1 with a piezoactuator, which is used, for example, for needle stroke control in the injection system for fuel in an internal combustion engine. can be used.
  • 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. It can be seen a plug part 3, by means of which the electrical voltage for driving the piezoelectric actuator can be connected with a connector also adapted specifically to the application.
  • the leadership of the electrical line and a possible supply of the controllable with the piezoelectric fuel in the holding body 2 is in this case in the holding body 2 can not be seen and for the operation of the invention also not essential.
  • a piezoelectric element 5 is arranged as part of the piezoelectric actuator, which acts on a nozzle needle 7 when actuated via a mechanical arrangement located vertically below with a coupler 6 such that release of a nozzle opening 8 can take place ,
  • a guided in the interior of the piezoelectric injector 1 through the interior of the fuel 4 can thus be injected into the combustion chamber of an internal combustion engine, not shown here.
  • Piezo layers of the piezoelectric element 5 are according to the figure 1 via an actuator base 9 at the top of a spherical sealing seat in the interior 4, wherein the piezoelectric element 5 and the piezoelectric actuator is pressed to effect a good sealing seat with a spring 10.
  • a high-pressure seal to an electrical connection space 11 is necessary here, through which two electrical lines 12 and 13, which are only schematically indicated, are led to the piezoelectric element 5.
  • Piezo layers are stacked one above the other in a manner known per se in the case of the piezoelectric element, said piezoelectric layers being made of ceramic piezofilms having a suitable crystal structure. are constructed so that taking advantage of the so-called piezoelectric effect in the manner described above when applying an external electrical voltage to here only by way of example provided with reference numerals internal electrodes 14 and 15, a mechanical reaction of the piezoelectric element 5 in the direction of the stack structure.
  • the supply of the different poles of the electrical voltage takes place in each case from one side via outer contact elements 16 and 17 or contact surfaces 18 and 19, which are mutually guided to the internal electrodes 14 and 15 of the respective piezoelectric layer of the piezoelectric element 5.
  • Figure 3 shows a erfindunmotheres embodiment with a representation, for example, the line 12 made of wire, which has to be connected ends 12a and 12b here.
  • An actuator base 20 here consists of a connecting part 21 made of metal, for example steel, and a ceramic part 22, which rests on the piezoelectric element 5.
  • the ends 12a and 12b of the conduit 12 are here angled out through the ceramic part 22 in a recess 23 which is accessible from the outside.
  • the line 12 is at least partially provided in the metallic Anbindeteil 21 with an insulation 24 or other cable guide or seal in the high-pressure-tight insulating ceramic part 22, the line 12 high-pressure-tight over a soldering or Glaseinschmelzung 25 embedded and in the piezoelectric element 5, the line 12 depending on Type of contacting the internal electrodes without insulation or partially insulated.
  • the ceramic part 22 according to the figure 3 is connected to the tether 21, which may consist of a plate or from a part of the housing of the piezoelectric actuator, via a likewise high pressure-tight adhesion or soldering.
  • the connection of the two ends 12a and 12b of the conduit 12 may be made, for example, by welding, resistance welding, soldering or crimping, etc.
  • FIGS. 4a and 4b show two variants of embossing of the ends 12a and 12b, wherein FIG. Regulation of the junction of the ends 12a and 12b is provided in a longitudinal groove 23 as a recess and in Figure 4b, a variant with a semicircular recess 26 is shown.
  • the end 12a here has, for example, a spoon-like embossment, which serves to receive and guide the end 12b during the connection.
  • FIGS. 5a and 5b From FIGS. 5a and 5b, FIGS. 6a and 6b, FIGS. 7a, 7b and FIGS. 8a, 8b, exemplary embodiments of the embossings of the end 12a for connection to the end 12b can be seen, which in various views in FIGS. 5a, 5b are spoon-like, in FIG Figures 6a, 6b have a wedge-shaped angled and in Figures 7a, 7b have a U-shaped embossing.
  • Figures 8a, 8b show such U-shaped embossing of the end 12a that this end 12a can be crimped around the other end 12b and electrically connected securely by soldering or welding.
  • the contact points of the electrical leads 12 or 13 exposed at the connection point can be covered with sealing plugs or injected by means of plastic or filled with ceramic kit according to FIGS. 9a to 9d.
  • a sealing plug 30 made of plastic or elastomer lies above the connection point of the lines 12a and 12b, whereby a so-called dovetail of the sealing plug 30 is supported on a supporting surface 31 which at the same time also enlarges the sealing surface.
  • the variant according to FIG. 9b shows a sealing plug 30 which comes to lie in a caulking contour 32 as a tenon and groove connection and additionally has a disassembly contour 33.
  • FIG. 9c From the figure 9c is a sintered or ground Verstemmkontur 34 can be seen in cross-section, in which then a corresponding sealing plug 35 can be inserted.
  • the variant according to FIG. 9d shows a contour 36 which has straight walls for better guidance and positional accuracy of the Has sealing plug 35 and prevents migration of the seal during operation.
  • a connection of the ends 12a and 12b of Figure 5a is made by means of a spoon-like embossing of the end 12a.
  • FIG. 10a and 10b show an embodiment with a straight guided connection of the ends 12a and 12 of the line 12, wherein also here, as in the embodiment of Figure 3, the ends are held by high pressure seals 35 in the ceramic part 22.
  • an abutment 45 is present and additional Abstützkonturen 37 are mounted for the sealing plug, not shown here.
  • FIG. 7b shows a section along the line A-A according to FIG. 7a.
  • FIGS. 11a, 11b and 11c Exemplary embodiments which have an actuator foot 40 made entirely of metal, for example steel, are shown in FIGS. 11a, 11b and 11c and in FIGS. 12a, 12b and 12c.
  • the insulation of the line 12 or the ends 12a and 12b necessary that they are provided for example with a ceramic tube and / or insert 41 and beyond, for example, after welding can still be embedded in a ceramic kit.
  • the embedding can also take place according to the figures 12b and 12c in an extension 42 at the junction.
  • the invention is industrially applicable to piezo actuators which can be used for injection injectors for fuel in so-called common rail systems (CR) for internal combustion engines in motor vehicles.
  • CR common rail systems

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 comprenant un actionneur piézoélectrique, par exemple sous la forme d'un injecteur piézoélectrique ou pour actionner un composant mécanique. Cet ensemble comprend une structure multicouche constituée de couches piézoélectriques qui sont maintenues sous la forme d'un élément piézoélectrique (5) dans un corps de retenue (2), cet élément piézoélectrique (5) présentant une mise en contact mutuelle d'électrodes intérieures (14, 15) avec des éléments de contact (16, 17). L'ensemble selon l'invention comprend par ailleurs une base d'actionneur (9 ; 21, 22) entre les couches piézoélectriques et la paroi d'un évidement intérieur (4) du corps de retenue (2), des lignes (12, 13) électriques reliées aux éléments de contact (16, 17) passant à travers cette base. Ces lignes (12, 13) sont guidées dans une zone de la base d'actionneur (21, 22 ; 40) jusqu'à un point de liaison qui est accessible de l'extérieur de la base d'actionneur (21, 22 ; 40) et au niveau duquel des extrémités opposées (12a, 12b) des lignes (12, 13) sont reliées électriquement et mécaniquement.
EP06777876A 2005-08-25 2006-07-21 Ensemble comprenant un actionneur piezoelectrique Withdrawn EP1920477A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005040198A DE102005040198A1 (de) 2005-08-25 2005-08-25 Anordnung mit einem Piezoaktor
PCT/EP2006/064482 WO2007023047A1 (fr) 2005-08-25 2006-07-21 Ensemble comprenant un actionneur piezoelectrique

Publications (1)

Publication Number Publication Date
EP1920477A1 true EP1920477A1 (fr) 2008-05-14

Family

ID=37192292

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06777876A Withdrawn EP1920477A1 (fr) 2005-08-25 2006-07-21 Ensemble comprenant un actionneur piezoelectrique

Country Status (4)

Country Link
EP (1) EP1920477A1 (fr)
JP (1) JP2009506735A (fr)
DE (1) DE102005040198A1 (fr)
WO (1) WO2007023047A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007027665A1 (de) * 2007-06-15 2008-12-18 Robert Bosch Gmbh Piezoaktormodul mit Kabeldurchführungen und ein Verfahren zu dessen Herstellung
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
CN114784178B (zh) * 2022-06-22 2022-09-09 上海隐冠半导体技术有限公司 压电致动器及移动装置

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4803763A (en) * 1986-08-28 1989-02-14 Nippon Soken, Inc. Method of making a laminated piezoelectric transducer
DE10039218A1 (de) * 2000-08-11 2002-02-28 Bosch Gmbh Robert Piezoelektrische Aktuatoranordnung, inbesondere zur Betätigung eines Ventils in einem Kraftfahrzeug
JP4715097B2 (ja) * 2003-03-13 2011-07-06 株式会社デンソー 圧電アクチュエータ、その製造方法及びインジェクタ
JP2004319967A (ja) * 2003-03-31 2004-11-11 Denso Corp 積層型圧電素子
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 WO2007023047A1 *

Also Published As

Publication number Publication date
DE102005040198A1 (de) 2007-03-01
WO2007023047A1 (fr) 2007-03-01
JP2009506735A (ja) 2009-02-12

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