DE10037743A1 - Piezo actuator especially for a control valve in a common rail injector system has ceramic body whose coefficient of thermal expansion corresponds with that of piezo-element - Google Patents
Piezo actuator especially for a control valve in a common rail injector system has ceramic body whose coefficient of thermal expansion corresponds with that of piezo-elementInfo
- Publication number
- DE10037743A1 DE10037743A1 DE10037743A DE10037743A DE10037743A1 DE 10037743 A1 DE10037743 A1 DE 10037743A1 DE 10037743 A DE10037743 A DE 10037743A DE 10037743 A DE10037743 A DE 10037743A DE 10037743 A1 DE10037743 A1 DE 10037743A1
- Authority
- DE
- Germany
- Prior art keywords
- piezo
- piezo actuator
- housing
- control valve
- actuator according
- 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
Links
- 239000000919 ceramic Substances 0.000 title abstract description 11
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 10
- 229910052759 nickel Inorganic materials 0.000 claims description 5
- 239000000956 alloy Substances 0.000 claims description 4
- 229910045601 alloy Inorganic materials 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 229910010293 ceramic material Inorganic materials 0.000 claims description 3
- 238000005476 soldering Methods 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 238000002347 injection Methods 0.000 claims description 2
- 239000007924 injection Substances 0.000 claims description 2
- 239000000463 material Substances 0.000 description 3
- 229910001374 Invar Inorganic materials 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 235000010678 Paulownia tomentosa Nutrition 0.000 description 1
- 240000002834 Paulownia tomentosa Species 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000009420 retrofitting Methods 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
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
- F02M61/166—Selection of particular 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
- 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
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
Description
Die Erfindung betrifft einen Piezo-Aktuator, insbesondere nach dem Oberbegriff des Anspruchs 1.The invention relates to a piezo actuator, in particular according to the preamble of claim 1.
Aktuatoren, die auf dem piezo-elektrischen Effekt beruhen, besitzen ohne Übersetzung in der Regel einen sehr kleinen Hub. Damit dieser Hub durch unterschiedliche Temperaturen nicht zusätzlich reduziert wird, muß der Temperatur-Aus dehnungskoeffizient seines Gehäuses dem des Piezoelements im Aktuator möglichst gleichen.Actuators based on the piezoelectric effect, usually have a very small one without translation Hub. So that this stroke through different temperatures is not additionally reduced, the temperature off expansion coefficient of its housing that of the piezo element in Actuator same if possible.
Bisher werden für das Gehäuse Werkstoffe mit einem hohen Nickelanteil (ca. 36%), wie z. B. INVAR oder Pernifer 36, ver wendet. Nachteilig an diesen Werkstoffen sind unter anderem die starke Temperaturabhängigkeit der Temperatur- Ausdehnungskoeffizienten und die nur angenäherte Übereinstim mung desselben mit dem des Piezoelements sowie die hohen Kos ten des Nickelanteils.So far, materials with a high nickel content (approx. 36%), such as. B. INVAR or Pernifer 36 , ver used. Disadvantages of these materials are, among other things, the strong temperature dependence of the temperature expansion coefficients and the only approximate correspondence of the same with that of the piezo element and the high cost of the nickel content.
Der Erfindung liegt die Aufgabe zugrunde, einen Werkstoff für das Gehäuse eines Piezo-Aktuators, insbesondere für ein Steu erventil in einem Common Rail-Einspritzsystem, anzugeben, der optimale Funktion mit niedrigen Kosten verbindet.The invention has for its object a material for the housing of a piezo actuator, in particular for a control valve in a common rail injection system, to specify the combines optimal function with low costs.
Die Aufgabe wird gelöst durch die Merkmale des Anspruchs 1. Bevorzugte Weiterbildungen sind in den abhängigen Ansprüchen angegeben.The object is achieved by the features of claim 1. Preferred developments are in the dependent claims specified.
Durch passendes Keramikmaterial für das Gehäuse läßt sich ein praktisch gleicher Temperatur-Ausdehnungskoeffizient beider Bauteile und damit der volle Hub des Piezoelements erreichen. Das gilt für alle Betriebstemperaturen, da der Temperatur- Ausdehnungskoeffizient beider Keramiken im in Frage kommenden Temperaturbereich nahezu konstant ist.A suitable ceramic material for the housing can be used practically the same temperature expansion coefficient of both Components and thus reach the full stroke of the piezo element. This applies to all operating temperatures because the temperature Expansion coefficient of both ceramics in question Temperature range is almost constant.
Ein grundsätzlicher Vorteil eines Keramikgehäuses ist dessen Fertigung durch Sintern. Dadurch entfällt jegliche zerspanen de Nacharbeit und deren Kosten. Der Ersatz der INVAR- Legierung durch Keramik bietet ebenfalls Kostenvorteile. Au ßerdem ist Keramik korrosionsbeständig und frei von Relaxati on.A fundamental advantage of a ceramic housing is that Manufacturing by sintering. This eliminates any machining rework and their costs. The replacement of the INVAR Alloy through ceramic also offers cost advantages. Au Ceramic is also corrosion-resistant and free of Relaxati on.
Von Vorteil ist, daß das Gehäuse ein Mittelstück aufweist, das vorzugsweise aus SiN, AlN oder AlC besteht. Die Keramik besitzt einen hohen E-Modul, weshalb der Hub des Piezoele ments praktisch nicht durch elastische Dehnung des Gehäuses unter den Verstellkräften des Aktuators verringert wird. Die hohe Festigkeit des verwendeten Keramikmaterials gestattet die Verwendung geringer Wandstärken, so daß der Bauraum des Injektors klein gehalten werden kann. Außerdem reduziert sie die Gefahr des Setzens infolge hoher Flächenpressungen in Verbindung mit hohen Temperaturen und hoher Schwingungsbelas tung.It is advantageous that the housing has a center piece, which preferably consists of SiN, AlN or AlC. The ceramics has a high modulus of elasticity, which is why the stroke of the piezoelectric practically not due to elastic expansion of the housing is reduced under the adjusting forces of the actuator. The high strength of the ceramic material used the use of thin walls, so that the space of the Injector can be kept small. It also reduces the risk of seating due to high surface pressures in Combination with high temperatures and high vibration loads tung.
Dadurch, daß das Mittelstück an zumindest einem seiner Enden mit einem metallischen Endstück fest verbunden ist, können der Aktuator oder eine metallische Dichtmembran an das metal lische Bauteil angeschweißt werden. Dieser bewährte Ferti gungsschritt wird durch die erfindungsgemäße Ausbildung des Gehäuses nicht beeinflußt.The fact that the middle piece at least one of its ends is firmly connected to a metallic end piece the actuator or a metallic sealing membrane to the metal components are welded on. This proven Ferti is step by the inventive training of Housing is not affected.
Das Anschweißen wird dadurch erleichtert, daß das metallische Endstück vorzugsweise aus Stahl oder einer Nickel- Basislegierung besteht.The welding is facilitated in that the metallic End piece preferably made of steel or a nickel Base alloy exists.
Die Hochtemperaturlötung stellt ein geeignetes und bewährtes Verbindungsverfahren zwischen Metall und Keramik dar. The high temperature soldering represents a suitable and proven Connection process between metal and ceramic.
Die Ringform des oder der Bauteil(e) paßt zu dem ringförmigen Gehäuse, zumal wenn die Wandstärke 4 des Rings und des Gehäu ses gleich groß sind.The ring shape of the component (s) matches the annular housing, especially if the wall thickness 4 of the ring and the housings are the same.
Weitere Merkmale der Erfindung ergeben sich aus den Ansprü chen der folgenden Beschreibung und der einzigen Figur, in der ein Ausführungsbeispiel des Gehäuses schematisch darge stellt ist.Further features of the invention result from the claims chen the following description and the only figure, in the an embodiment of the housing schematically Darge represents is.
Ein Gehäuse 1 eines Piezo-Aktuators dient zum Schutz und zur Abstützung eines nicht dargestellten Piezoelements. Es ist kreiszylinderförmig gestaltet und besitzt ein Mittelstück 2, an dessen Enden 3, 3' je ein Endstück 4, 4' befestigt ist.A housing 1 of a piezo actuator serves to protect and support a piezo element, not shown. It is designed in the shape of a circular cylinder and has a center piece 2 , at the ends 3 , 3 'of which an end piece 4 , 4 ' is fastened.
Das Mittelstück 2 besteht aus Keramik, deren Temperatur- Ausdehnungskoeffizient dem des Piezoelements im gesamten in Frage kommenden Temperaturbereich entspricht. Dadurch werden Dehnungsdifferenzen vermieden, die den Hub des Piezoelements verringern würden. Durch den hohen E-Modul der Keramik findet eine vernachlässigbare elastische Verformung des Gehäuses 1 unter den Verstellkräften des Piezoelements statt, so daß auch von dieser Seite her dessen Hub unbeeinflußt bleibt.The middle piece 2 consists of ceramic, the temperature expansion coefficient of which corresponds to that of the piezo element in the entire temperature range in question. This avoids expansion differences that would reduce the stroke of the piezo element. Due to the high modulus of elasticity of the ceramic, there is a negligible elastic deformation of the housing 1 under the adjustment forces of the piezo element, so that its stroke remains unaffected from this side.
Die Endstücke 4, 4' sind durch Hochtemperaturlöten mit den Enden 3, 3' des Mittelstücks 2 verbunden. Sie bestehen aus Stahl oder einer Nickel-Basislegierung, wodurch ein Anschwei ßen von z. B. einer metallischen Dichtmembran möglich ist. Da durch ist ein einfacher Austausch des üblichen ganzmetalli schen Gehäuses durch das erfindungsgemäße Keramikgehäuse ge geben und damit ein Nachrüsten des Injektors ermöglicht.The end pieces 4 , 4 'are connected to the ends 3 , 3 ' of the middle piece 2 by high-temperature soldering. They consist of steel or a nickel-based alloy, which means that welding of e.g. B. a metallic sealing membrane is possible. Since by a simple exchange of the usual all-metallic housing through the ceramic housing according to the invention give ge and thus enables retrofitting of the injector.
Claims (7)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10037743A DE10037743A1 (en) | 2000-08-02 | 2000-08-02 | Piezo actuator especially for a control valve in a common rail injector system has ceramic body whose coefficient of thermal expansion corresponds with that of piezo-element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10037743A DE10037743A1 (en) | 2000-08-02 | 2000-08-02 | Piezo actuator especially for a control valve in a common rail injector system has ceramic body whose coefficient of thermal expansion corresponds with that of piezo-element |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE10037743A1 true DE10037743A1 (en) | 2002-02-21 |
Family
ID=7651125
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE10037743A Ceased DE10037743A1 (en) | 2000-08-02 | 2000-08-02 | Piezo actuator especially for a control valve in a common rail injector system has ceramic body whose coefficient of thermal expansion corresponds with that of piezo-element |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE10037743A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004034481A1 (en) * | 2002-10-07 | 2004-04-22 | Siemens Aktiengesellschaft | Piezoelectric actuator for an injection device |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2822627C2 (en) * | 1978-05-24 | 1988-02-18 | Volkswagen Ag | |
| EP0869278A1 (en) * | 1997-04-04 | 1998-10-07 | Siemens Aktiengesellschaft | Piezoelectric injection valve with means to compensate for the thermal expansion of piezoelectric actuator |
| DE19928183A1 (en) * | 1999-06-19 | 2001-01-04 | Bosch Gmbh Robert | Piezo actuator |
| DE19928179A1 (en) * | 1999-06-19 | 2001-01-04 | Bosch Gmbh Robert | Piezo actuator |
| DE19948359A1 (en) * | 1999-10-07 | 2001-01-11 | Siemens Ag | Piezoelectric actuator unit e.g. for controlling motor vehicle combustion engine fuel injection valves |
-
2000
- 2000-08-02 DE DE10037743A patent/DE10037743A1/en not_active Ceased
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2822627C2 (en) * | 1978-05-24 | 1988-02-18 | Volkswagen Ag | |
| EP0869278A1 (en) * | 1997-04-04 | 1998-10-07 | Siemens Aktiengesellschaft | Piezoelectric injection valve with means to compensate for the thermal expansion of piezoelectric actuator |
| DE19928183A1 (en) * | 1999-06-19 | 2001-01-04 | Bosch Gmbh Robert | Piezo actuator |
| DE19928179A1 (en) * | 1999-06-19 | 2001-01-04 | Bosch Gmbh Robert | Piezo actuator |
| DE19948359A1 (en) * | 1999-10-07 | 2001-01-11 | Siemens Ag | Piezoelectric actuator unit e.g. for controlling motor vehicle combustion engine fuel injection valves |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004034481A1 (en) * | 2002-10-07 | 2004-04-22 | Siemens Aktiengesellschaft | Piezoelectric actuator for an injection device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP0869278A1 (en) | Piezoelectric injection valve with means to compensate for the thermal expansion of piezoelectric actuator | |
| DE19928179B4 (en) | piezo actuator | |
| EP1292994B1 (en) | Piezo actuator | |
| DE19538791A1 (en) | Piezo control valve for fuel injection systems of internal combustion engines | |
| EP1490594B1 (en) | Fuel injection valve | |
| DE19906468B4 (en) | Piezoelectric actuator | |
| EP0931358B1 (en) | Control element with a controllable length actuator and device for the transmission of the displacement of the actuator | |
| DE19909106C2 (en) | Temperature compensated piezoelectric actuator unit | |
| EP1436499B1 (en) | Fuel injection valve | |
| DE19906467A1 (en) | Injector with piezo multilayer actuator in particular for common rail diesel injection system | |
| EP1194958A1 (en) | Piezo-actuator comprising a temperature compensator | |
| EP1704323B1 (en) | Piezo actuator comprising means for compensating thermal length modifications and fuel-injection valve comprising a piezo actuator | |
| DE10037743A1 (en) | Piezo actuator especially for a control valve in a common rail injector system has ceramic body whose coefficient of thermal expansion corresponds with that of piezo-element | |
| EP0547022A1 (en) | Piezo-electric valve | |
| WO2010142753A1 (en) | Injection valve comprising a transmission unit | |
| DE69506775T2 (en) | Valve yoke with a contact surface that reduces wear | |
| EP3049666B1 (en) | Piezo injector for direct injection of fuel | |
| DE19908471A1 (en) | Hollow cylindrical spring | |
| DE19714292C2 (en) | Device for transmitting a deflection of an actuator | |
| EP1252663A2 (en) | Piezo actuator | |
| DE10159748B4 (en) | Fuel injector | |
| DE10219149A1 (en) | Fuel injector has piezoelectric actuator unit in a housing with a different temperature coefficient of expansion to the injector body for temperature compensation | |
| EP1849991A2 (en) | Metal body | |
| EP1347168B1 (en) | Injector for internal combustion engines | |
| WO2004034481A1 (en) | Piezoelectric actuator for an injection device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| OP8 | Request for examination as to paragraph 44 patent law | ||
| 8131 | Rejection |