WO2010128110A1 - Ensemble actionneur piézoélectrique - Google Patents

Ensemble actionneur piézoélectrique Download PDF

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Publication number
WO2010128110A1
WO2010128110A1 PCT/EP2010/056196 EP2010056196W WO2010128110A1 WO 2010128110 A1 WO2010128110 A1 WO 2010128110A1 EP 2010056196 W EP2010056196 W EP 2010056196W WO 2010128110 A1 WO2010128110 A1 WO 2010128110A1
Authority
WO
WIPO (PCT)
Prior art keywords
actuator
housing
partial
actuator unit
unit according
Prior art date
Application number
PCT/EP2010/056196
Other languages
German (de)
English (en)
Inventor
Christoph Hamann
Carsten Schuh
Original Assignee
Continental Automotive 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 Continental Automotive Gmbh filed Critical Continental Automotive Gmbh
Publication of WO2010128110A1 publication Critical patent/WO2010128110A1/fr

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
    • H10N30/88—Mounts; Supports; Enclosures; Casings
    • 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
    • H10N30/50—Piezoelectric or electrostrictive devices having a stacked or multilayer structure

Definitions

  • the invention relates to an actuator unit, in particular for fuel injection modules for internal combustion engines.
  • Piezoceramic actuator units are an integral part of the fuel injection system of an internal combustion engine, and are used, for example, for controlling injectors.
  • Conventional actuator units for example, shown in EP 154 88 54 Al, which are suitable for highly dynamic operation, are made up of a number of individual components, such as a piezoelectric actuator and a static bias mimic, and usually a housing to protect against environmental influences and / or mechanical influences.
  • the disadvantage here is the large space required for a particular performance of an actuator.
  • the actuator unit according to the invention has a piezoelectric actuator, wherein the piezoelectric actuator has a peripheral surface and the peripheral surface of the piezoelectric actuator comprises one or more actuator partial surfaces.
  • the Actuator on a piezoelectric actuator enclosing housing wherein the housing has an inner surface and the inner surface of the housing comprises one or more housing partial surfaces. Each housing partial surface is arranged substantially parallel to in each case one actuator partial surface.
  • the advantage of the actuator unit according to the invention is that the housing partial surfaces located on the inside of the housing can be designed close to the contour of the actuator partial surfaces.
  • the housing partial surfaces can be arranged over a large part of the circumference of the piezoelectric actuator with a substantially constant distance to the actuator partial surfaces.
  • the inner contour of the housing can be substantially adapted to the shape of the piezoelectric actuator, in particular to the cross-sectional area of the piezoelectric actuator.
  • the cross-sectional area of the piezoelectric actuator may in particular comprise necessary contacting means and / or an electrical passivation layer. This leads to a reduction in the overall construction of the
  • Piezoactors required cross-sectional area. This thus also allows a reduction in the outer diameter of the housing and leads to an improved use of the example available for installation space, for example in an internal combustion engine. Likewise, with a constant outer diameter of the housing, a piezoelectric actuator having an enlarged cross-sectional area can be used. This leads to an improved use of the installation space of the actuator unit and to more power with the same installation space. An enlargement of the
  • Cross-sectional area of the piezoelectric actuator can allow the application of a larger force, whereby, for example, at a constant stroke, the work done by the piezoelectric actuator and Consequently, the performance can be greater.
  • the inner contour of the housing can be transferred to the outer contour of the housing. This makes it possible to produce compact actuator units which can be structurally adapted to the respective available installation space. This leads to greater flexibility of the designers, for example in the design of fuel injection modules.
  • the actuator unit has at least one contacting means, which is at least partially connected in an electrically conductive manner to the piezoelectric actuator.
  • the contacting means may comprise one or more contacting partial areas which, in particular in each case, are or are arranged substantially parallel to at least one actuator partial area.
  • the contacting means may for example be designed in the form of two electrical conductors, which are at least partially adapted to the outer shape of the piezoelectric actuator. It is advantageous that the contacting can be designed so that, for example, the isolation distance between contacting and piezoelectric actuator can be increased so that electrical flashovers can be avoided. Furthermore, it is advantageous that the configuration of the electrically conductive contacting makes it possible, for example, to avoid fractures and cracks at the contact points between the contact means and the piezoactuator and thus make the contacting more reliable.
  • the actuator unit preferably has a passivation layer for avoiding electrical flashovers, which surrounds the piezoactuator.
  • the passivation layer can thereby the piezoelectric actuator and / or the contacting, in particular at least partially enclose.
  • the passivation can in particular be made of silicone, which is applied for example by casting or injection molding.
  • the passivation layer has an outer surface which comprises one or more passivation partial areas, each passivation partial area being arranged essentially parallel to a respective actuator partial area. It is advantageous that the necessary electrical passivation can be applied in a substantially homogeneous thickness to the piezoelectric actuator and / or the contacting means. This improves the reliability of the passivation and reduces the risk of electrical flashovers to the piezoelectric actuator and / or other components of the actuator unit.
  • a spring element for static biasing of the piezoelectric actuator may be provided in the actuator unit, which surrounds the piezoelectric actuator at least partially.
  • the spring element can be connected to a top plate and a bottom plate, which rest for example on the piezoelectric actuator.
  • the spring element has a surface which comprises one or more spring partial surfaces, wherein each spring partial surface is arranged substantially parallel to a respective actuator partial surface and / or passivation partial surface.
  • the Bourdon tube designed as a tube spring.
  • the Bourdon tube can be designed such that the spring partial surfaces are connected to one another and form edges.
  • the advantage here is the increased stability of the spring element.
  • the Bourdon tube can be produced inexpensively by bending, for example.
  • the piezoelectric actuator is configured polygonal and has a plurality of straight partial surfaces, in particular at least three
  • the piezoelectric actuator has a number N of partial areas, wherein the number N may preferably be 3 ⁇ N ⁇ 20, particularly preferably 4 ⁇ N ⁇ 12, very particularly preferably 6 ⁇ N ⁇ 8.
  • the number N may preferably be 3 ⁇ N ⁇ 20, particularly preferably 4 ⁇ N ⁇ 12, very particularly preferably 6 ⁇ N ⁇ 8.
  • a symmetrical cross-sectional area of the piezoelectric actuator is made possible.
  • the piezoelectric actuator is formed from a plurality of stacked piezoceramic bodies as a multilayer actuator.
  • the length of the stroke of a piezoelectric actuator can be adjusted.
  • the advantage here is the possibility of the piezoelectric actuator to the depending on the application required technical conditions.
  • the material of the housing is an iron-nickel alloy, in particular with a proportion of 36% nickel.
  • the material of the housing may have very low or sometimes negative coefficients of thermal expansion in certain temperature ranges relative to, for example, steel.
  • the inner surface of the housing can be produced by extrusion or swaging, in particular with a mandrel.
  • the cost-effective production of the internal geometry of the housing is advantageous.
  • the outer geometry of the housing can, for example, at a constant wall thickness of
  • Housing to be adapted to the internal geometry of the housing.
  • the invention further relates to the use of an actuator unit according to the invention in diesel and / or gasoline injection modules, wherein the actuator unit as described above can be trained and further developed.
  • FIG. 1 shows a schematic view of an actuator unit according to the invention.
  • the actuator unit 10 shown in FIG. 1 has a piezoactuator 12 which has an octagonal cross-section.
  • the peripheral surface 14 of the piezoelectric actuator 12 comprises eight actuator partial surfaces 15.
  • the piezoelectric actuator 12 is arranged in a housing 16 whose inner surface 18 is eight
  • Housing partial surfaces 19 includes.
  • the piezoelectric actuator 12 is electrically conductively connected to two actuator partial surfaces 15, each with a contacting means 20.
  • the contacting means 20 have contacting partial areas 21, which are arranged parallel to the respectively corresponding actuator partial areas 15.
  • a passivation layer 22 which may be made of silicone, for example, to avoid electrical flashovers.
  • the passivation layer 22 has an outer surface 24, which comprises a plurality of passivation partial areas 25.
  • the passivation layer 22, which encloses the piezoactuator 12 with the contacting means 20, is encompassed by a spring element 26 in the form of a tubular spring.
  • the spring element 26 has a surface 28 which comprises eight spring partial surfaces 30.

Landscapes

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

Abstract

L'invention concerne un ensemble actionneur (10) comprenant un actionneur piézoélectrique (12), l'actionneur piézoélectrique (12) présentant une surface périphérique (14), et la surface périphérique comprenant une ou plusieurs surfaces partielles (15) d'actionneur, et un boîtier (16) enveloppant l'actionneur piézoélectrique (12), le boîtier (16) présentant une surface intérieure (18), et la surface intérieure (18) du boîtier (16) comprenant une ou plusieurs surfaces partielles (19) de boîtier. L'invention est caractérisée en ce que l'ensemble actionneur (10) présente une surface partielle (19) de boîtier, sensiblement parallèle à chaque surface partielle d'actionneur (15). Du fait que les surfaces partielles (19) de boîtier et les surfaces partielles (15) d'actionneur sont parallèles, une diminution de l'encombrement peut être obtenue pour une puissance déterminée de l'ensemble actionneur.
PCT/EP2010/056196 2009-05-07 2010-05-06 Ensemble actionneur piézoélectrique WO2010128110A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102009020270A DE102009020270A1 (de) 2009-05-07 2009-05-07 Aktoreinheit
DE102009020270.6 2009-05-07

Publications (1)

Publication Number Publication Date
WO2010128110A1 true WO2010128110A1 (fr) 2010-11-11

Family

ID=42461074

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2010/056196 WO2010128110A1 (fr) 2009-05-07 2010-05-06 Ensemble actionneur piézoélectrique

Country Status (2)

Country Link
DE (1) DE102009020270A1 (fr)
WO (1) WO2010128110A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109417125A (zh) * 2016-07-01 2019-03-01 物理仪器(Pi)两合有限公司 超声致动器

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19740570A1 (de) * 1997-09-15 1999-03-18 Siemens Ag Piezoelektrischer Aktor mit einem elektrischen Anschluß
WO2000047887A1 (fr) * 1999-02-10 2000-08-17 Robert Bosch Gmbh Injecteur avec piezo-actionneur multicouche pour systemes d'injection
EP1734253A1 (fr) * 2005-06-17 2006-12-20 Siemens Aktiengesellschaft Soupape d'injection avec manchon et méthode de sa production
DE102006059694A1 (de) * 2006-12-18 2008-06-19 Robert Bosch Gmbh Aktormodul mit einem umhüllten Piezoaktor und Verfahren zu dessen Herstellung
EP1956229A1 (fr) * 2007-02-09 2008-08-13 Delphi Technologies, Inc. Actionneur piézoélectrique et son enceinte

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE60311494T2 (de) 2003-12-22 2007-06-06 Siemens Vdo Automotive S.P.A., Fauglia Aktoreinheit und Verfahren zu deren Herstellung
DE102006036444A1 (de) * 2006-03-30 2007-10-04 Robert Bosch Gmbh Kraftstoffinjektor
DE102006018916A1 (de) * 2006-04-24 2007-10-25 Siemens Ag Metallischer Körper
DE102007001515B4 (de) * 2007-01-10 2009-10-29 Gesenkschmiede Schneider Gmbh Verfahren zum Herstellen eines Ventils mit mindestens einem Flügel, sowie danach hergestelltes Ventil

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19740570A1 (de) * 1997-09-15 1999-03-18 Siemens Ag Piezoelektrischer Aktor mit einem elektrischen Anschluß
WO2000047887A1 (fr) * 1999-02-10 2000-08-17 Robert Bosch Gmbh Injecteur avec piezo-actionneur multicouche pour systemes d'injection
EP1734253A1 (fr) * 2005-06-17 2006-12-20 Siemens Aktiengesellschaft Soupape d'injection avec manchon et méthode de sa production
DE102006059694A1 (de) * 2006-12-18 2008-06-19 Robert Bosch Gmbh Aktormodul mit einem umhüllten Piezoaktor und Verfahren zu dessen Herstellung
EP1956229A1 (fr) * 2007-02-09 2008-08-13 Delphi Technologies, Inc. Actionneur piézoélectrique et son enceinte

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109417125A (zh) * 2016-07-01 2019-03-01 物理仪器(Pi)两合有限公司 超声致动器
CN109417125B (zh) * 2016-07-01 2022-07-22 物理仪器(Pi)两合有限公司 超声致动器

Also Published As

Publication number Publication date
DE102009020270A1 (de) 2010-11-11

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