WO2006103192A1 - Unite d'activation piezo-electrique comprenant une capacite de conduction thermique ameliorer et injecteur de carburant - Google Patents

Unite d'activation piezo-electrique comprenant une capacite de conduction thermique ameliorer et injecteur de carburant Download PDF

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Publication number
WO2006103192A1
WO2006103192A1 PCT/EP2006/060962 EP2006060962W WO2006103192A1 WO 2006103192 A1 WO2006103192 A1 WO 2006103192A1 EP 2006060962 W EP2006060962 W EP 2006060962W WO 2006103192 A1 WO2006103192 A1 WO 2006103192A1
Authority
WO
WIPO (PCT)
Prior art keywords
piezoelectric actuator
actuator unit
unit according
partial
fuel injector
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.)
Ceased
Application number
PCT/EP2006/060962
Other languages
German (de)
English (en)
Inventor
Günter LEWENTZ
Carsten Schuh
Thorsten Steinkopff
Claus Zumstrull
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.)
Siemens AG
Siemens Corp
Original Assignee
Siemens AG
Siemens Corp
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 Siemens AG, Siemens Corp filed Critical Siemens AG
Publication of WO2006103192A1 publication Critical patent/WO2006103192A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting
    • 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
    • F02M53/00—Fuel-injection apparatus characterised by having heating, cooling or thermally-insulating means
    • F02M53/04—Injectors with heating, cooling, or thermally-insulating 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
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/90—Selection of particular materials
    • F02M2200/9015—Elastomeric or plastic materials
    • 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

Definitions

  • Piezoelectric actuator unit with improved thermal conductivity and fuel injector
  • the invention is based on a piezoelectric actuator unit with an actuator module according to the preamble of claim 1, which is arranged in a filled with a potting plastic sleeve.
  • the actuator module is electrically connected to two contacting pins and is encased by a tubular spring. Furthermore, the actuator module is connected to a top plate and to a bottom plate, which terminate the upper and the lower end of the tube spring and are non-positively connected to the actuator module.
  • the entire unit is arranged in an actuator housing, which at the
  • the invention relates to a fuel injector according to the independent claim 13, which is formed with the piezoelectric actuator unit according to the invention.
  • a further problem is that for future injection systems stricter exhaust conditions for the internal combustion engine are to be met. For compliance with the stricter exhaust conditions, however, a higher specific driving energy is required, through which an even higher power loss or heat loss arises.
  • Known fuel injectors formed with today's piezoelectric actuator units are therefore not usable in future injection systems, since they would not withstand the higher thermal loads.
  • the invention is based on the object to improve the thermal capacity in a piezoelectric actuator unit or in a fuel injector. This object is achieved with the features of the independent claims 1 and 13.
  • the partial area can be increased in a particularly simple manner if it has a curvature which, for example, is convex, concave, conical, spherical or irregularly shaped. Due to the curvature, the surface of the component can be considerably increased, thereby resulting in a much greater heat dissipation.
  • the available surface of the component can be used optimally for an area enlargement.
  • such structures can be applied to virtually any material.
  • a partial surface can be formed for example by a simple embossing, which is easy to install, in particular on a thin-walled surface of a component.
  • the surface can be enlarged particularly effectively if the partial surfaces are coated with particles.
  • the particles can be easily applied, for example, by a sintering process or a corresponding coating method.
  • the structure To simplify the manufacturing process for the structure is provided to form the structure of symmetrically arranged partial surfaces.
  • the individual partial surfaces can be arranged next to one another in rows, so that structures which are relatively easy to produce result for which good convection or heat conduction can form for the heat flow.
  • a particularly favorable arrangement of the partial surfaces is seen in a strip-shaped or honeycomb-shaped arrangement. Such a structure can be easily applied to any shaped surface.
  • the surface of the component can be particularly effectively increased if several partial surfaces are arranged in a scaly abutting one another.
  • a further advantageous solution for enlarging the surface is, on the surface of the component
  • FIG. 1 shows a sectional view through a piezoelectric actuator unit according to the invention
  • FIGS. 2a to 2e show several exemplary embodiments of the invention with different structures for enlarging the surface
  • FIG. 3 shows a sectional view of a structure with a particle coating
  • Figure 4 shows a fuel injector with a piezoelectric actuator according to the invention according to the figure 1 in a schematic representation.
  • the piezoelectric actuator unit 1 shows a sectional view through a piezoelectric actuator unit 1 according to the invention, which can be used in particular as a drive unit for actuating an injection nozzle in a fuel injector.
  • the piezoelectric actuator unit 1 has an actuator module 2, which is composed of several hundred piezoelectric ceramic layers in the form of a stack actuator. Between each two ceramic layers, an inner electrode is arranged, which is alternately electrically connected to two outer electrodes of the outer wall of the actuator module 2 extending vertically. Furthermore, two contacting pins 7 are arranged parallel to the two outer electrodes and are contacted via corresponding lines to the two outer electrodes.
  • the actuator module 2 with the wired two Kunststoff Kunststoffspins 7 in a plastic sleeve (mounting sleeve) 5 is inserted and fixed.
  • the plastic sleeve 5 is simultaneously formed as a cast in which the components used with 2.7 a potting compound 9, for example, be cast with a Vergusssilikon, elastomer or the like.
  • the plastic sleeve 5 is made of a plastic, for example made of a PA plastic (polyamide).
  • a top plate 3 is arranged, which is non-positively connected to the actuator module 2.
  • the top plate 3 thus limits the actuator module 2 upwards.
  • two insulated bushings for the two Mais michellesspins 7 are designed so that the protruding ends of the twomaschinessenspins 7 can be later connected to the electrical supply of the actuator module 2 to a control voltage of a corresponding control unit.
  • the lower end of the actuator module 2 is bounded by a bottom plate 4, which is also non-positively connected to the actuator module 2.
  • a tube spring 8 is sleeve-shaped and surrounds the molded actuator module 2.
  • the tube spring 8 is mounted with a biasing force acting on the actuator module 2 as a restoring force and thus a provision of the non-actuated actuator module 2 in its normal position supported.
  • the entire assembly is sheathed by an actuator housing 6 sleeve-shaped.
  • the upper end of the actuator housing 6 is fixedly and sealingly connected to the top plate 3.
  • the lower end of the actuator housing 6 is arranged to be axially movable relative to the base plate 4, but is also sealed in a fuel-tight manner.
  • the heat flow dQ / dt occurring per unit time of the individual components (3 to 8) can be calculated according to the formula:
  • dQ / dt is the temporal heat flux
  • ⁇ is the heat conduction coefficient in W / (K * m)
  • ⁇ is the thickness of the wall of a component
  • F is the area through which the heat flows, corresponding to the surface of the component
  • t w i is the temperature of the warmer wall surface
  • t W 2 is the temperature of the colder wall surface.
  • the heat flow dQ / dt of a component 8 increases proportionally with increasing area F.
  • the area F corresponds to the surface of one of the components 3 to 8 listed above.
  • the thermal load of the piezoelectric actuator unit 1 and the fuel injector 11 is advantageously significantly reduced and thus improves the thermal capacity.
  • the heat transfer performance is increased, in particular in the case of free surfaces, by the convection which occurs.
  • An optimal heat flow is achieved if possible all affected components 3 to 8 are formed with respect to their structure with the largest possible surface.
  • the component temperature, in particular that of the actuator module 2 drops so low that the piezoelectric actuator unit 1 is suitable for higher quality requirements and can be operated, for example, with a higher activation energy.
  • the number of injection pulses per duty cycle can be safely increased to five or more injection pulses without the piezoelectric actuator unit 1 and the fuel injector 11 are thermally overloaded.
  • the solution according to the invention advantageously results in new free spaces for improved injection strategies.
  • FIGS. 2a to 2e show by way of example five structures S according to the invention with which the surface of one or more components can be enlarged.
  • a strip-shaped arrangement of partial surfaces F is provided in the structure S according to FIG. 2a.
  • the individual partial surfaces F can be separated from each other by introduced trenches or depressions. be separated.
  • it is provided to apply the partial surfaces F to the surface of a component having correspondingly different heights.
  • the partial surfaces F can be applied by embossing.
  • the partial surfaces F can be produced by injection molding.
  • FIG. 2b shows a further embodiment of the invention.
  • the structure S is formed from symmetrically arranged partial surfaces F which are honeycomb-shaped (honeycomb patterns).
  • the shape of a partial surface F can be chosen arbitrarily. It is intended to form the shape as a geometric polygon, for example as a square, rectangle, rhombus or the like.
  • the bulge may be convex, concave, conical, spherical, irregularly shaped or the like.
  • Figure 2c shows an embodiment of the invention, in which the structure S has a partial surface F, which is formed with a hole pattern.
  • the circular faces F are placed on the surface of the component and thereby increase the surface.
  • the structures S have a multiplicity of partial surfaces F, which are arranged in the form of a scale in abutting relationship with one another.
  • the surface 13 of the component 8 by a coating with particles 10 to enlarge.
  • the partici- 10 can be made of the same material as the component 8 and produced for example by a sintering process. Alternatively, they can be applied by a coating process with a suitable granulate. In this case, in particular, a good heat-conducting material can be used. Depending on the choice of the size and shape of the particles 10 thus the surface of the component can be increased by three to four times.
  • the partial surfaces F can be coated with a good heat-conducting coating.
  • FIG. 4 shows a fuel injector 11 as a sectional view, as can be used, for example, in a common rail injection system for a diesel or gasoline engine.
  • the fuel is supplied via a fuel inlet 12.
  • the piezoelectric actuator unit 1 and below this is a valve unit 14 is arranged.
  • the arrangement of the actuator unit 1 is designed such that it is in operative connection with the valve unit 14.
  • the piezoelectric actuator unit 1 At the upper end of the piezoelectric actuator unit 1 are the connections for the Kunststoffssenspins 7. By applying an electrical control voltage to the Kunststoffssenspins 7, the piezoelectric actuator unit 1 extends a small piece. This extension causes the valve unit 14 to lift its nozzle needle and to open the injection holes 15 located in the lower part of the nozzle unit 14. This allows the fuel to be injected at high pressure into a cylinder of the engine. After switching off the control voltage, the piezoelectric actuator unit 1 retracts back into its basic position. This increases nern the fuel injector 11 is controlled by the fuel pressure closing force acting on the nozzle needle and as a result, the injection holes 15 again closes or seals.

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

En général, dans une unité d'activation (1) piézo-électrique ou dans un injecteur de carburant (11), la chaleur dissipée produite à l'intérieur d'un module d'action, en particulier lors d'une injection multiple n'est pas dissipée de manière optimale dans l'environnement et l'injecteur de carburant chauffe de manière non souhaitée. Selon l'invention, un des composants (3-8), insérés dans l'unité d'activation (1) piézo-électrique, par exemple la plaque de tête (3), la plaque de fond (4), le logement de réception (5), la broche de mise en contact (7), le tube ressort (8) et/ou le logement d'actionneur (6), présente une structure (S) élargissant la surface. Ladite structure (S) agit avec la surface élargie, de sorte qu'un flux thermique optimal est créé. De manière avantageuse, une plus grande quantité de chaleur dissipée peut être dissipée dans l'environnement. Cela permet d'obtenir un nouvel espace pour de nouvelles applications. Ainsi, l'injection de carburant, en fonction des émissions de gaz d'échappement et d'odeurs, un rendement amélioré et une réduction de l'utilisation de carburant sont améliorés.
PCT/EP2006/060962 2005-03-29 2006-03-22 Unite d'activation piezo-electrique comprenant une capacite de conduction thermique ameliorer et injecteur de carburant Ceased WO2006103192A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005014163.3 2005-03-29
DE102005014163.3A DE102005014163B4 (de) 2005-03-29 2005-03-29 Piezoelektrische Aktoreinheit mit verbesserter Wärmeleitfähigkeit sowie Kraftstoffinjektor

Publications (1)

Publication Number Publication Date
WO2006103192A1 true WO2006103192A1 (fr) 2006-10-05

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PCT/EP2006/060962 Ceased WO2006103192A1 (fr) 2005-03-29 2006-03-22 Unite d'activation piezo-electrique comprenant une capacite de conduction thermique ameliorer et injecteur de carburant

Country Status (2)

Country Link
DE (1) DE102005014163B4 (fr)
WO (1) WO2006103192A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102893420A (zh) * 2010-08-26 2013-01-23 京瓷株式会社 压电致动器
US8724833B1 (en) 2012-12-18 2014-05-13 Floyd Bell Inc. Piezoelectric audible signal with spring contacts and retaining and spacer ring

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008060518A1 (de) * 2008-12-04 2010-07-15 Continental Automotive Gmbh Einspritzventil

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DE19648545A1 (de) * 1996-11-25 1998-05-28 Ceramtec Ag Außenelektrode für einen monolithischen Vielschichtaktor
WO2000034701A1 (fr) * 1998-12-05 2000-06-15 Robert Bosch Gmbh Commande piezoelectrique
WO2000034699A1 (fr) * 1998-12-05 2000-06-15 Robert Bosch Gmbh Actionneur piezoelectrique
WO2000063980A1 (fr) * 1999-04-20 2000-10-26 Robert Bosch Gmbh Actionneur piezoelectrique
EP1104940A1 (fr) * 1999-12-02 2001-06-06 Piezomechanik GmbH Organe d'actionnement à l' état solide , plus particulierement organe d'actionnenment pièzoélectrique
EP1150363A2 (fr) * 2000-04-20 2001-10-31 Tokin Ceramics Corporation Actionneur piézoélectrique multicouche ayant un élément conducteur attaché à son électrode extérieure
WO2003069152A1 (fr) * 2002-02-13 2003-08-21 Siemens Aktiengesellschaft Element d'etancheite pour l'actionneur piezoelectrique d'une soupape d'injection de carburant

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19648545A1 (de) * 1996-11-25 1998-05-28 Ceramtec Ag Außenelektrode für einen monolithischen Vielschichtaktor
WO2000034701A1 (fr) * 1998-12-05 2000-06-15 Robert Bosch Gmbh Commande piezoelectrique
WO2000034699A1 (fr) * 1998-12-05 2000-06-15 Robert Bosch Gmbh Actionneur piezoelectrique
WO2000063980A1 (fr) * 1999-04-20 2000-10-26 Robert Bosch Gmbh Actionneur piezoelectrique
EP1104940A1 (fr) * 1999-12-02 2001-06-06 Piezomechanik GmbH Organe d'actionnement à l' état solide , plus particulierement organe d'actionnenment pièzoélectrique
EP1150363A2 (fr) * 2000-04-20 2001-10-31 Tokin Ceramics Corporation Actionneur piézoélectrique multicouche ayant un élément conducteur attaché à son électrode extérieure
WO2003069152A1 (fr) * 2002-02-13 2003-08-21 Siemens Aktiengesellschaft Element d'etancheite pour l'actionneur piezoelectrique d'une soupape d'injection de carburant

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102893420A (zh) * 2010-08-26 2013-01-23 京瓷株式会社 压电致动器
CN102893420B (zh) * 2010-08-26 2015-07-15 京瓷株式会社 压电致动器
US9130149B2 (en) 2010-08-26 2015-09-08 Kyocera Corporation Piezoelectric actuator for suppressing disconnection
US8724833B1 (en) 2012-12-18 2014-05-13 Floyd Bell Inc. Piezoelectric audible signal with spring contacts and retaining and spacer ring

Also Published As

Publication number Publication date
DE102005014163B4 (de) 2015-09-17
DE102005014163A1 (de) 2006-10-05

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