DE102016211325A1 - Kontaktierungsbauelement and arrangement of a Kontaktierungsbauelement and a piezo stack - Google Patents

Kontaktierungsbauelement and arrangement of a Kontaktierungsbauelement and a piezo stack Download PDF

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Publication number
DE102016211325A1
DE102016211325A1 DE102016211325.9A DE102016211325A DE102016211325A1 DE 102016211325 A1 DE102016211325 A1 DE 102016211325A1 DE 102016211325 A DE102016211325 A DE 102016211325A DE 102016211325 A1 DE102016211325 A1 DE 102016211325A1
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Germany
Prior art keywords
contacting
piezo stack
longitudinal axis
positioning plates
along
Prior art date
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Ceased
Application number
DE102016211325.9A
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German (de)
Inventor
Claus Zumstrull
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Continental Automotive GmbH
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Continental Automotive GmbH
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Publication date
Application filed by Continental Automotive GmbH filed Critical Continental Automotive GmbH
Priority to DE102016211325.9A priority Critical patent/DE102016211325A1/en
Publication of DE102016211325A1 publication Critical patent/DE102016211325A1/en
Ceased legal-status Critical Current

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    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H01L41/00Piezo-electric devices in general; Electrostrictive devices in general; Magnetostrictive devices in general; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L41/02Details
    • H01L41/04Details of piezo-electric or electrostrictive devices
    • H01L41/047Electrodes or electrical connection arrangements
    • H01L41/0475Further connection or lead arrangements, e.g. flexible wiring boards, terminal pins
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H01L41/00Piezo-electric devices in general; Electrostrictive devices in general; Magnetostrictive devices in general; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L41/02Details
    • H01L41/04Details of piezo-electric or electrostrictive devices
    • H01L41/053Mounts, supports, enclosures or casings
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H01L41/00Piezo-electric devices in general; Electrostrictive devices in general; Magnetostrictive devices in general; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L41/22Processes or apparatus specially adapted for the assembly, manufacture or treatment of piezo-electric or electrostrictive devices or of parts thereof
    • H01L41/29Forming electrodes, leads or terminal arrangements
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H01L41/00Piezo-electric devices in general; Electrostrictive devices in general; Magnetostrictive devices in general; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L41/08Piezo-electric or electrostrictive devices
    • H01L41/083Piezo-electric or electrostrictive devices having a stacked or multilayer structure

Abstract

The invention relates to a contacting component (10) for contacting a piezo stack (12), wherein the contacting component (10) has a centering component (16) with two spaced apart positioning plates (20) and two contacting pins (14), wherein the centering component (16) and the Kontaktierungspins (14) are materially interconnected. Furthermore, the invention relates to an arrangement (32) of such a Kontaktierungsbauelement (10), in which a piezo stack (12) is inserted inserted.

Description

  • The invention relates to a Kontaktierungsbauelement for electrically contacting a piezo stack and an arrangement of such Kontaktierungsbauelement and a piezo stack.
  • Piezo stacks, also known as piezo stacks, which are often used in drives of fuel injectors, usually consist of a plurality of piezoelectric material layers, such as piezoelectric ceramic layers, which are stacked alternately with internal electrode layers. Commercially available piezo stacks frequently have more than 300 such material layers. To produce a change in length of the piezo stack, the so-called stroke, the piezoelectric material layers are exposed to an electric field. The piezoelectric effect causes an elongation of the piezoelectric material layers. The sum of the expansions of the piezo stack material layers results in the stroke of the entire piezo stack. The electric field is generated by means of the inner electrode layers, which are arranged above and below each individual piezoelectric material layer. Thus, between the individual piezoelectric material layers there are alternately an inner electrode layer which is acted upon by a positive potential and a negative potential and which are cyclically charged and discharged again.
  • The contacting of the inner electrode layers takes place from outside the piezo stack, in such a way that only every second inner electrode layer per side is contacted, and advantageously via a flexible electrical connection, which can follow the movements during a longitudinal expansion of the piezo stack in operation.
  • On the basis of this electrical connection usually a further contact is provided, which allows a connection to an electrical potential from outside.
  • This further contact is increasingly burdened with increasing arrangements of the fuel injector, such as by higher temperatures, more desired injections and higher mechanical loads, thermally, electrically and mechanically.
  • In the traditional construction, it is known that the further contact is connected directly to the piezoelectric stack positively and / or positively. This usually leads to a power coupling of further contact and the piezo stack.
  • In addition, there are high requirements with regard to the positioning of the further contact.
  • The object of the invention is therefore to propose further contacting a piezo stack, which can meet the increasing requirements.
  • This object is achieved with a Kontaktierungsbauelement with the feature combination of claim 1.
  • An arrangement of such a Kontaktierungsbauelement and a piezo stack is the subject of the independent claim.
  • Advantageous embodiments of the invention are the subject of the dependent claims.
  • A Kontaktierungsbauelement for electrically contacting a piezoelectric stack has at least two electrically conductive Kontaktierungspins, which are arranged along a longitudinal axis substantially parallel to each other, and an electrically insulating Zentrierungsbauelement, the at least two spaced along the longitudinal axis and substantially parallel positioning plates each having a receiving opening has to pick up the piezo stack. In this case, the contacting pins and the centering component are firmly bonded together.
  • It is therefore proposed a Kontaktierungsbauelement, in which the functions of contacting the piezo stack itself, the positioning of the piezo stack and the Weitererkontaktierung outwardly spatially or functionally separated. In this case, the splitting into a plurality of functional units is achieved by the contacting component assuming the functions of centering and further contacting. This contacting component can therefore be manufactured very precisely, for example, from a plastic injection molding and at low cost. The Kontaktierungspins are materially connected to the area that takes over the centering of the piezo stack, namely the at least two positioning plates connected. In this way, it is possible to realize the positioning accuracy of the further contacting in the form of Kontaktierungspins on very small space in a specific manufacturing step.
  • Preferably, the Zentrierungsbauelement and the Kontaktierungspins are formed by injection molding, wherein the positioning plates are formed molded on the Kontaktierungspins. In this case, a positionally accurate arrangement of the Kontaktierungspins is achieved relative to the piezo stack, which is later inserted into the Kontaktierungsbauelement.
  • The Zentrierungsbauelement, in particular the positioning plates, the centering of the Piezo stack take over later, are electrically insulated to avoid flashovers between the two Kontaktierungspins that take over the electrical connection to the inner electrode layers of the piezo stack. The Zentrierungsbauelement is therefore advantageously made of plastic, especially since plastic can be easily processed by injection molding.
  • There are advantageously at least two positioning plates provided to take over the later centering of the piezo stack. However, it is also possible to provide further positioning plates which are arranged at a distance from each other along the longitudinal axis and substantially parallel to one another.
  • Preferably, the positioning plates are each formed in a positioning plate plane, wherein the longitudinal axis substantially forms the plane normal to the positioning plate planes. This means that the positioning plates are arranged substantially perpendicular to the Kontaktierungspins, so that the Kontaktierungspins serve as a spacer between the two positioning plates and connect them together. The material connection between Kontaktierungspins and positioning plates, the positioning plates are held in the desired position.
  • Advantageously, the receiving openings along the longitudinal axis are arranged in alignment, so that later the piezo stack can be inserted by simply plugging into the receiving openings along the longitudinal axis in the Kontaktierungsbauelement.
  • In an advantageous embodiment, the receiving opening is arranged centrally on each positioning plate, wherein the contacting pins are each arranged on an edge region of the positioning plate, in particular symmetrically to the receiving opening. As a result, the piezo stack is later, when it is inserted into the Kontaktierungsbauelement, centrally within the Kontaktierungsbauelementses, wherein the Kontaktierungspins arranged outside and thus are easily accessible for contacting from the outside.
  • It is particularly advantageous if the Kontaktierungspins are arranged opposite to the receiving opening on an axis of symmetry. If, for example, the receiving openings are rectangular, it is advantageous if the two contacting pins are arranged opposite one another in each case, for example, centrally on a longitudinal side of the receiving opening.
  • Preferably, the centering component has at least one, in particular at least two, arranged parallel to the longitudinal axis stabilizing ribs, which are integrally formed with the positioning plates. These stabilizing ribs serve to keep the contacting components stable along the longitudinal axis.
  • When the stabilizing ribs are formed integrally with the positioning plates, it is possible to produce the contacting device in a manufacturing step, for example, by injection molding.
  • Preferably, the stabilizing ribs are arranged symmetrically to the receiving opening, in particular with respect to the receiving opening opposite one another, to the positioning plates.
  • It is particularly advantageous if the stabilizing ribs are arranged on an axis of symmetry with respect to the receiving opening, in such a way that the axis of symmetry on which the stabilizing ribs are arranged is arranged perpendicular to the axis of symmetry on which the contacting pins are arranged. As a result, the stabilizing ribs and the contacting pins are arranged symmetrically around the receiving opening and can contribute to the stabilization of the entire contacting component.
  • It is also possible to dispense with the stabilizing ribs, but in this case it is advantageous if at least four Kontaktierungspins are arranged symmetrically about the receiving opening in order to stabilize the Kontaktierungsbauelement.
  • Advantageously, the contacting pins have a greater length along the longitudinal axis than the centering component, wherein the contacting pins terminate flush with one of the positioning plates along the longitudinal axis, in particular on one side. As a result, the contacting pins project at least at one end beyond the centering component along the longitudinal axis, and can thus be easily contacted from the outside.
  • In order to achieve a particularly good centering and stabilization of the later inserted piezo stack, it is advantageous if a distance between the two positioning plate is approximately as large as the piezo stack is long along the longitudinal axis.
  • In an arrangement of a Kontaktierungsbauelement described above and a piezo stack having a plurality of piezoelectric material layers and a plurality of inner electrode layers which alternately along a stacked longitudinal axis, the piezo stack is accommodated in at least two receiving openings of at least two positioning plates of a Zentrierungsbauelements of Kontaktierungsbauelements. In this case, an electrical connection is arranged between each contacting pin of the centering component and every second internal electrode layer of the piezo stack adjacent to the contacting pin.
  • If, therefore, in a further step, the piezo stack is inserted into the prefabricated contacting component, which has the two contacting pins, an automatic centering of the piezo stack results relative to the two contacting pins. In a further step, the electrical contacting of the piezo stack and the contacting pins is then realized as a further contacting element.
  • In this case, the electrical connection, in particular in the direction of the longitudinal axis of the contacting component and a longitudinal axis of the piezo stack, which coincide after insertion of the piezo stack into the contacting component, is advantageously designed to be flexible.
  • Preferably, the piezo stack is fastened exclusively in a form-fitting manner in the receiving openings. This means there are no other attachment methods, such as gluing or clipping or the like.
  • Preferably, the electrical connection is formed by soldering or gluing a Kontaktierungsmatte or Kontaktierungsgewebes or individual wires between the Kontaktierungspin and the inner electrodes. Alternatively, it is also possible to form the electrical connection by means of a single-wire bonding process.
  • All mentioned production forms for forming the electrical connection result in a flexible electrical connection along the longitudinal axis. In all types of Ankontaktierung a mechanical flexibility is taken into account in order to reduce the mechanical stresses that occur during the elongation of the piezo stack with respect to the Kontaktierungspins as Weitererkontaktierungselementen.
  • After formation of the electrical connection, the entire arrangement is advantageously encapsulated with an insulating material and then inserted, for example, in a bourdon tube, which applies a biasing force to the piezo stack in order to keep it stable during operation.
  • In order to be able to produce this in a particularly simple manner, the positioning plates are substantially circular, although other shapes of the positioning plates are also possible depending on the geometry requirement of the environment and the desired encapsulation.
  • An advantageous embodiment of the invention will be explained in more detail with reference to the accompanying drawings. It shows:
  • 1 a perspective view of a Kontaktierungsbauelementes for electrically contacting a piezoelectric stack having two electrically conductive Kontaktierungspins;
  • 2 a perspective view of the Kontaktierungsbauelementes 1 with inserted piezo stack; and
  • 3 a perspective view accordingly 2 , wherein an electrical connection between the piezo stack and the Kontaktierungspins is provided.
  • 1 shows a contacting device 10 with which a piezostack 12 ( 2 . 3 ) and at the same time can be electrically contacted from the outside. The contacting component 10 has for the electrical contacting at least two electrically conductive Kontaktierungspins 14 and for centering an electrically insulating Zentrierungsbauelement 16 on. The centering component 16 comprises at least two along a longitudinal axis 18 along which the contacting pins 14 extend, spaced apart positioning plates 20 , These positioning plates 20 are arranged parallel to each other and each have a receiving opening 22 on, in the later the Piezostapel 12 can be inserted so as to be centered.
  • Next, the contacting component 10 at least two stabilizing ribs 24 on, which is also parallel to the longitudinal axis 18 between the two positioning plates 20 extend, and are integrally formed with these.
  • The contacting component 10 is made by injection molding, that is, the two Kontaktierungspins 14 be so encapsulated with a plastic that the positioning plates 20 form cohesively so that the Zentrierungsbauelement 16 , in particular formed by the two positioning plates 20 , and the contacting pins 14 connect materially together. Here are the Kontaktierungspins 14 arranged so that the receiving opening 22 the respective positioning plate 20 centrally on each positioning plate 20 is located while the contacting pins 14 each at a border area 26 the respective positioning plate 20 are arranged.
  • The positioning plates 20 are perpendicular to the longitudinal axis 18 arranged so that the longitudinal axis 18 essentially the plane normal N E of the positioning plate planes E P of the two positioning plates 20 forms, in which the positioning plates 20 are formed. The receiving openings 22 are arranged in alignment with each other, so later the piezo stack 12 simply in the Kontaktierungsbauelement 10 can be inserted.
  • The contacting pins 14 are so on the Kontaktierungsbauelement 10 arranged on a first axis of symmetry 28 lie the positioning plates 20 each divided into two halves. Likewise, the stabilizing ribs 24 on a second axis of symmetry 30 arranged the two positioning plates 20 also divided into two halves. Here are the first axis of symmetry 28 and the second axis of symmetry 30 perpendicular to each other and perpendicular to the longitudinal axis 18 arranged.
  • The receiving openings 22 For example, are rectangular, with the stabilizing ribs 24 and the contacting pins 14 each located on one longitudinal side of the rectangle. However, it is also conceivable, depending on the cross-sectional shape of the piezo stack to be inserted later 12 , these intake openings 22 to provide with a different geometric shape.
  • The symmetrical arrangement of the contacting pins 14 and the stabilizing ribs 24 around the receiving opening 22 contributes to a better stability of the Kontaktierungsbauelementes 10 at. It is conceivable the stabilizing ribs 24 for example, by further Kontaktierungspins 14 to replace. So that a good contact from the outside is possible later, have the Kontaktierungspins 14 along the longitudinal axis 18 a greater length L than the centering device 16 whose length is defined by the distance A between the two positioning plates 20 is defined. It is advantageous if the Kontaktierungspins 14 along the longitudinal axis 18 one-sided flush with one of the positioning plates 20 and on the other side the second of the positioning plates 20 overtop.
  • To achieve even greater stability, it is also conceivable that multiple positioning plates 20 on the contacting component 10 are arranged.
  • The advantage here is the distance A between the two positioning plates 20 as long as the length L of the piezo stack 12 , later in the Kontaktierungsbauelement 10 should be inserted.
  • 2 shows a perspective view of an arrangement 32 comprising the contacting device described above 10 and a piezo stack inserted therein 12 having.
  • The piezostack 12 is from a plurality of piezoelectric material layers 34 and a plurality of internal electrodes 36 built, alternating along the longitudinal axis 18 stacked on top of each other. As in 2 you can see the piezostack 12 in the two receiving openings 22 inserted and thereby within the Kontaktierungsbauelementes 10 centered.
  • 3 shows a third perspective view of the arrangement 32 out 2 wherein an electrical connection between each second of the inner electrode layers 36 of the piezo stack 12 and the adjacent Kontaktierungspins 14 is realized. The electrical connection 38 in each case connects only every second inner electrode layer 36 with the adjacent contacting pin 14 , and on the opposite side with the other contacting pin 14 every other inner electrode layer 36 not yet with the first contacting pin 14 connected is. This makes it possible, from the outside, a different potential to the two Kontaktierungspins 14 and thus to every other inner electrode layer 36 be applied, so that a deflection of the piezoelectric material layers 34 of the piezo stack 12 becomes possible. Alternatively, it is also possible with the electrical connections 38 from the contacting pin 14 from a collecting electrode on the piezo stack 12 to contact. This collecting electrode then in turn contacts every second inner electrode layer in the case 26 of the piezo stack 12 ,
  • As in 2 you can see the piezostack 12 only form-fitting in the receiving openings 22 fixed, and not held by other elements, such as by clips, or by adhesive bonds.
  • The electrical connection 38 has advantageous along the longitudinal axis 18 a mechanical flexibility, so that mechanical stresses that occur during the elongation of the piezo stack 12 opposite the Kontaktierungspins 14 arise, can be degraded. This mechanical flexibility can be achieved by using as electrical connection, for example, a contacting mat or a contacting fabric or individual wires 40 between the respective Kontaktierungspins 14 and the inner electrode layers are soldered or glued. It is also conceivable that the electrical connection 38 via a single wire bonding process.
  • With the Kontaktierungsbauelement it is possible, the functions of electrical contacting of the piezo stack 12 , Positioning of the piezo stack 12 and further contact spatially and functionally separate.

Claims (10)

  1. Contacting device ( 10 ) for electrically contacting a piezo stack ( 12 ), comprising at least two electrically conductive contacting pins ( 14 ) along a longitudinal axis ( 18 ) are arranged substantially parallel to each other, as well as an electrically insulating Zentrierungsbauelement ( 16 ), at least two along the longitudinal axis ( 18 ) spaced and substantially parallel positioning plates ( 20 ) each having a receiving opening ( 22 ) for picking up the piezo stack ( 12 ), wherein the contacting pins ( 14 ) and the centering component ( 16 ) are cohesively connected to each other.
  2. Contacting device ( 10 ) according to claim 1, characterized in that the centering component ( 16 ) and the contacting pins ( 14 ) are formed by injection molding, wherein the positioning plates ( 20 ) at the contacting pins ( 14 ) are formed molded.
  3. Contacting device ( 10 ) according to one of claims 1 or 2, characterized in that the positioning plates ( 20 ) are each formed in a positioning plate plane (E P ), wherein the longitudinal axis ( 18 ) substantially forms the plane normal (N E ) to the positioning plate planes (E P ), the receiving openings ( E 22 ) along the longitudinal axis ( 18 ) are arranged in alignment.
  4. Contacting device ( 10 ) according to one of claims 1 to 3, characterized in that on each positioning plate ( 20 ) the receiving opening ( 22 ) is arranged centrally, wherein the Kontaktierungspins ( 14 ) each at an edge area ( 26 ) of the positioning plate ( 20 ), in particular symmetrically to the receiving opening ( 22 ) are arranged.
  5. Contacting device ( 10 ) according to one of claims 1 to 4, characterized in that the centering component ( 16 ) at least one, in particular at least two, parallel to the longitudinal axis ( 18 ) arranged stabilizing ribs ( 24 ) which are integral with the positioning plates ( 20 ) are formed.
  6. Contacting device ( 10 ) according to claim 5, characterized in that the stabilizing ribs ( 24 ) symmetrical to the receiving opening ( 22 ), in particular with regard to the receiving opening ( 22 ) opposite one another, on the positioning plates ( 20 ) are arranged.
  7. Contacting device ( 10 ) according to one of claims 1 to 6, characterized in that the contacting pins ( 14 ) along the longitudinal axis ( 18 ) have a greater length (L) than the centering component ( 16 ), wherein the Kontaktierungspins ( 14 ) along the longitudinal axis ( 18 ) in particular one-sided flush with one of the positioning plates ( 20 ) to lock.
  8. Arrangement ( 32 ) from a Kontaktierungsbauelement ( 10 ) according to one of claims 1 to 7 and a piezo stack ( 12 ) comprising a plurality of piezoelectric material layers ( 34 ) and a plurality of internal electrode layers ( 36 ) which alternately along a longitudinal axis ( 18 ) are stacked on each other, wherein the piezo stack ( 12 ) in at least two receiving openings ( 22 ) at least two positioning plates ( 20 ) of a centering component ( 16 ) of the contacting component ( 10 ), wherein between each contacting pin ( 14 ) of the centering device ( 16 ) and every second, to the Kontaktierungspin ( 14 ) adjacent inner electrode layer ( 36 ) of the piezo stack ( 12 ) an electrical connection ( 38 ) is arranged.
  9. Arrangement ( 32 ) according to claim 8, characterized in that the piezo stack ( 12 ) exclusively positively in the receiving openings ( 22 ) is attached.
  10. Arrangement ( 32 ) according to one of claims 8 or 9, characterized in that the electrical connection ( 38 ) by soldering or gluing a contact mat or a Kontaktierungsgewebes or individual wires ( 40 ) between the contacting pin ( 14 ) and the inner electrode layers ( 36 ), or is formed by a Einzeleldrahtbondprozess.
DE102016211325.9A 2016-06-24 2016-06-24 Kontaktierungsbauelement and arrangement of a Kontaktierungsbauelement and a piezo stack Ceased DE102016211325A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE102016211325.9A DE102016211325A1 (en) 2016-06-24 2016-06-24 Kontaktierungsbauelement and arrangement of a Kontaktierungsbauelement and a piezo stack

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102016211325.9A DE102016211325A1 (en) 2016-06-24 2016-06-24 Kontaktierungsbauelement and arrangement of a Kontaktierungsbauelement and a piezo stack
PCT/EP2017/058976 WO2017220231A1 (en) 2016-06-24 2017-04-13 Contact-making component and arrangement comprising a contact-making component and a piezoelectric stack

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DE102016211325A1 true DE102016211325A1 (en) 2017-10-12

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DE102016211325.9A Ceased DE102016211325A1 (en) 2016-06-24 2016-06-24 Kontaktierungsbauelement and arrangement of a Kontaktierungsbauelement and a piezo stack

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WO (1) WO2017220231A1 (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005035971A1 (en) * 2003-10-14 2005-04-21 Siemens Aktiengesellschaft Piezoelectric actuator and associated production method
DE102004024867B3 (en) * 2004-05-19 2005-12-22 Siemens Ag Method and device for contacting a piezoelectric actuator

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009009164B4 (en) * 2009-02-16 2014-10-02 Continental Automotive Gmbh Piezoelectric actuator, method for producing the actuator and injector
DE202014100666U1 (en) * 2014-02-14 2014-02-24 Epcos Ag Piezoelectric actuator component

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005035971A1 (en) * 2003-10-14 2005-04-21 Siemens Aktiengesellschaft Piezoelectric actuator and associated production method
DE102004024867B3 (en) * 2004-05-19 2005-12-22 Siemens Ag Method and device for contacting a piezoelectric actuator

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