WO2006089818A1 - Module actionneur dote d'un actionneur piezo-electrique - Google Patents

Module actionneur dote d'un actionneur piezo-electrique Download PDF

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Publication number
WO2006089818A1
WO2006089818A1 PCT/EP2006/050216 EP2006050216W WO2006089818A1 WO 2006089818 A1 WO2006089818 A1 WO 2006089818A1 EP 2006050216 W EP2006050216 W EP 2006050216W WO 2006089818 A1 WO2006089818 A1 WO 2006089818A1
Authority
WO
WIPO (PCT)
Prior art keywords
actuator
piezoelectric
composite material
head
actuator module
Prior art date
Application number
PCT/EP2006/050216
Other languages
German (de)
English (en)
Inventor
Holger Rapp
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 WO2006089818A1 publication Critical patent/WO2006089818A1/fr

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
    • 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
    • H10N30/88—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 actuator module with a piezoelectric actuator which lies over a head and foot part in a housing or a sleeve, for example for actuating a mechanical component such as a valve or the like, according to the generic features of the main claim.
  • a piezoelectric element can be constructed of a material having a suitable crystal structure.
  • a mechanical reaction of the piezoelectric element takes place, which, depending on the crystal structure and the contact regions of the electrical voltage, represents a pressure or tension in a predeterminable direction.
  • Such piezoelectric actuators are particularly suitable for use in fast and precise switching operations, for example se in various systems for gasoline or diesel injection in internal combustion engines.
  • this piezoelectric actuator can be carried out here in several layers (multilayer actuators), wherein the electrodes, via which the electrical voltage is applied, are each arranged between the layers.
  • multilayer actuators multilayer actuators
  • the electrodes, via which the electrical voltage is applied are each arranged between the layers.
  • a piezoelectric actuator is known from DE 199 28 177 A1.
  • the piezoelectric actuator is installed in a so-called actuator module.
  • This actuator module consists of the piezoelectric actuator itself with an actuator head, which passes on the actuator force to the component to be actuated and an actuator foot, via which the piezoactuator is supported in the injector body.
  • This arrangement is seated in a sleeve which is tightly welded to the Aktorfuß and there is usually a movable Dichtelemetn available, which connects the actuator head and the sleeve tightly but mutually displaceable.
  • the aforementioned Aktorfuß has essentially the task of sealing the interior of the actuator module against the electrical connection of the injector, which can be done for example by an O-ring, and to enable the electrical contacting of the piezoelectric actuator at all. Furthermore, the gap between the piezoelectric actuator and the sleeve is usually filled with a potting compound.
  • Both the actuator foot and the actuator head are thereby electrically conductive and connected to the injector housing, which in turn is electrically connected to ground potential.
  • both the minus and the plus electrodes Rode the piezoelectric actuator in response to the control of the power electronic power amplifier of a control unit in each case to jumping potential.
  • a parasitic coupling capacitor is formed between the respectively lowest inner electrode of the piezoelectric actuator and the actuator base and between the respective uppermost inner electrode of the piezoactuator and the actuator head, whose capacitance depends on the dielectric constant ⁇ of the ceramic layers of the piezoactuator, the cross-sectional area of the respective inner electrode and their spacing depends on the surface of the actuator base or the actuator head.
  • the capacitances of the two electrically coupled coupling capacitors should be kept as small as possible, because every time the potential of a peripheral internal electrode of the piezoelectric actuator changes over the parasitic capacitors a compensation current flows with very high-frequency components, which lead to high-frequency e- lektromagnetician disturbances can.
  • the actuator module described in the introduction with a piezoactuator arranged in a sleeve usually has a multilayer structure of piezoelectric layers and internal electrodes arranged therebetween, which are acted upon by mutual lateral contacting with an electrical voltage and wherein the piezoactuator is enclosed between an actuator foot and an actuator head.
  • the actuator foot and / or the actuator head is made of a non-conductive material in an advantageous manner.
  • the actuator foot according to the invention can contribute to a noise reduction due to its mechanical damping properties.
  • the non-conductive material of the actuator base or of the actuator head is a composite material, preferably a powder composite material.
  • the composite material consist of mutually insulated metal particles.
  • this can be realized when the metal particles are joined by a plastic or metal oxide admixture.
  • FIG. 1 shows a section through an actuator module with a piezoelectric actuator of a multilayer structure of layers of piezoceramics and electrodes in an application structure according to the prior art
  • FIG. 2 a representation of the actuator module according to FIG. 1 with electrical equivalent circuit diagrams, 3a and 3b each show a section through an inventive embodiment of the actuator head and the Aktorfußes of a non-conductive composite material and
  • FIG. 1 shows an actuator module with a piezoelectric actuator 1 according to the prior art, which is constructed in a conventional manner of piezoelectric films 2 of a ceramic material having a suitable crystal structure, so that taking advantage of the so-called piezoelectric effect when applying an external electrical voltage to internal electrodes 3 and 4 via contact surfaces 5 and 6, a mechanical reaction of the piezoelectric actuator 1 takes place.
  • the external voltage is passed through insulated leads 7 and 8 on the contact surfaces 5 and 6.
  • a force F can be exerted.
  • the actuator module with the components described above is held tightly in an injector body 13 via an insulating O-ring 12 for a common-rail injector, which is not shown here. 1, it can be seen that the injector body 13 is electrically grounded and that the actuator base 10 and the actuator head 11 known from the prior art are generally produced by cutting from electrically conductive material.
  • an inventive embodiment of an actuator base 20 is shown in Figure 3a and an actuator head 21 is shown in Figure 3b. Both the actuator base 20 and the actuator head 21 are here in contrast to the conductive metal according to Figures 1 and 2 made of a powder composite material 23, which consists mainly of metal particles which are connected by a plastic or Metallloxidimengung, as in a similar manner used for magnetic cores.
  • the individual metal particles are enclosed by a thin plastic or oxide layer which isolates these particles from each other.
  • the powder composite material 23 generally has an edge breakage strength of greater than 2OkN, so that the use in an actuator module with biasing forces that are static, for example 750N and dynamically 1500N, is not critical.
  • FIGS. 4a and 4b While, for example, the eddy currents are drastically reduced in the case of the magnetic cores mentioned, in the case of an illustration with electrical equivalent circuit diagrams shown in FIGS. 4a and 4b, the reference to FIG coupling capacitances C k i and C k2 each have a further coupling capacitance C k i 2 (to the actuator foot 10) and C k2 2 (to the actuator head 11) connected in series.
  • the coupling capacitances C k i 2 and C k22 are formed between the actuator-side and the housing-side surface of the actuator base 10 and the actuator head 11.

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 module actionneur doté d'un actionneur piézo-électrique (1) logé dans une enveloppe (9) et inséré entre une base d'actionneur (10) et une tête d'actionneur (11). L'invention est caractérisée en ce que la base d'actionneur (10) et/ou la tête d'actionneur (11) sont en matériau non conducteur (23), lequel est un matériau composite (23), de préférence un matériau composite pulvérulent.
PCT/EP2006/050216 2005-02-25 2006-01-16 Module actionneur dote d'un actionneur piezo-electrique WO2006089818A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005008718.3 2005-02-25
DE102005008718A DE102005008718A1 (de) 2005-02-25 2005-02-25 Aktormodul mit einem Piezoaktor

Publications (1)

Publication Number Publication Date
WO2006089818A1 true WO2006089818A1 (fr) 2006-08-31

Family

ID=36088260

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2006/050216 WO2006089818A1 (fr) 2005-02-25 2006-01-16 Module actionneur dote d'un actionneur piezo-electrique

Country Status (3)

Country Link
DE (1) DE102005008718A1 (fr)
TW (1) TW200722613A (fr)
WO (1) WO2006089818A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008151939A1 (fr) * 2007-06-15 2008-12-18 Robert Bosch Gmbh Module à actionneur piezo-électrique présentant des passages de câbles, et son procédé de réalisation
EP1916721A3 (fr) * 2006-10-25 2010-12-29 Robert Bosch Gmbh Actionneur piézoélectrique

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007004874A1 (de) * 2006-10-02 2008-04-03 Robert Bosch Gmbh Piezoaktor, bestehend aus übereinander gestapelten, elektrisch kontaktierten Piezoelementen
DE102006062562A1 (de) * 2006-12-29 2008-07-03 Robert Bosch Gmbh Brennstoffeinspritzventil
DE102007001563A1 (de) 2007-01-10 2008-07-17 Robert Bosch Gmbh Piezoaktor mit zwischen einem Aktorkopf und einem Aktorfuß eingespannten Piezoelementen
DE102007008618A1 (de) * 2007-02-22 2008-08-28 Robert Bosch Gmbh Piezoaktormodul mit einer Kabeldurchführung
DE102010061946A1 (de) * 2010-11-25 2012-05-31 Robert Bosch Gmbh Piezoelektrisches Aktormodul und Brennstoffeinspritzventil

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4553059A (en) * 1983-11-10 1985-11-12 Nippon Soken, Inc. Piezoelectric actuator and a piezoelectric pump injector incorporating the same
EP1096136A2 (fr) * 1999-10-29 2001-05-02 Delphi Technologies, Inc. Injecteur de combustible
WO2003009400A2 (fr) * 2001-07-12 2003-01-30 Ceramtec Ag Innovative Ceramic Engineering Actionneur multicouche monolithique dans un boitier
WO2005015651A1 (fr) * 2003-07-31 2005-02-17 Robert Bosch Gmbh Actionneur piezo-electrique

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4553059A (en) * 1983-11-10 1985-11-12 Nippon Soken, Inc. Piezoelectric actuator and a piezoelectric pump injector incorporating the same
EP1096136A2 (fr) * 1999-10-29 2001-05-02 Delphi Technologies, Inc. Injecteur de combustible
WO2003009400A2 (fr) * 2001-07-12 2003-01-30 Ceramtec Ag Innovative Ceramic Engineering Actionneur multicouche monolithique dans un boitier
WO2005015651A1 (fr) * 2003-07-31 2005-02-17 Robert Bosch Gmbh Actionneur piezo-electrique

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1916721A3 (fr) * 2006-10-25 2010-12-29 Robert Bosch Gmbh Actionneur piézoélectrique
WO2008151939A1 (fr) * 2007-06-15 2008-12-18 Robert Bosch Gmbh Module à actionneur piezo-électrique présentant des passages de câbles, et son procédé de réalisation

Also Published As

Publication number Publication date
TW200722613A (en) 2007-06-16
DE102005008718A1 (de) 2006-08-31

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