WO2004034481A1 - Piezoaktuator für eine einspritzvorrichtung - Google Patents
Piezoaktuator für eine einspritzvorrichtung Download PDFInfo
- Publication number
- WO2004034481A1 WO2004034481A1 PCT/DE2003/003287 DE0303287W WO2004034481A1 WO 2004034481 A1 WO2004034481 A1 WO 2004034481A1 DE 0303287 W DE0303287 W DE 0303287W WO 2004034481 A1 WO2004034481 A1 WO 2004034481A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- housing
- piezo actuator
- head plate
- ceramic
- actuator according
- Prior art date
Links
- 238000002347 injection Methods 0.000 title claims abstract description 9
- 239000007924 injection Substances 0.000 title claims abstract description 9
- 229910010293 ceramic material Inorganic materials 0.000 claims abstract description 13
- 239000000446 fuel Substances 0.000 claims abstract description 3
- 239000000919 ceramic Substances 0.000 claims description 29
- 229910052751 metal Inorganic materials 0.000 claims description 11
- 239000002184 metal Substances 0.000 claims description 11
- 238000005476 soldering Methods 0.000 claims description 11
- 239000012528 membrane Substances 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 6
- 238000003466 welding Methods 0.000 claims description 6
- 238000001465 metallisation Methods 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 4
- QLJCFNUYUJEXET-UHFFFAOYSA-K aluminum;trinitrite Chemical compound [Al+3].[O-]N=O.[O-]N=O.[O-]N=O QLJCFNUYUJEXET-UHFFFAOYSA-K 0.000 claims description 3
- NHWNVPNZGGXQQV-UHFFFAOYSA-J [Si+4].[O-]N=O.[O-]N=O.[O-]N=O.[O-]N=O Chemical compound [Si+4].[O-]N=O.[O-]N=O.[O-]N=O.[O-]N=O NHWNVPNZGGXQQV-UHFFFAOYSA-J 0.000 claims description 2
- 229910052878 cordierite Inorganic materials 0.000 claims description 2
- JSKIRARMQDRGJZ-UHFFFAOYSA-N dimagnesium dioxido-bis[(1-oxido-3-oxo-2,4,6,8,9-pentaoxa-1,3-disila-5,7-dialuminabicyclo[3.3.1]nonan-7-yl)oxy]silane Chemical compound [Mg++].[Mg++].[O-][Si]([O-])(O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2)O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2 JSKIRARMQDRGJZ-UHFFFAOYSA-N 0.000 claims description 2
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 2
- 229910010271 silicon carbide Inorganic materials 0.000 claims 1
- 229910000831 Steel Inorganic materials 0.000 description 9
- 239000010959 steel Substances 0.000 description 9
- 239000000463 material Substances 0.000 description 7
- 229910001374 Invar Inorganic materials 0.000 description 5
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 4
- 239000006187 pill Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 229910000679 solder Inorganic materials 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000011324 bead Substances 0.000 description 2
- 238000005304 joining Methods 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 230000007704 transition Effects 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
- 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
Definitions
- the present invention relates to an injection device for injecting fuel with a piezo actuator according to the preamble of claim 1 and a method for producing a piezo actuator.
- Injection devices with piezo actuators are well known in the art. Due to the heat generated during operation, the piezo actuator experiences thermally induced changes in length, which must be compensated for in order to ensure safe and reliable operation of the piezo actuator. It has therefore been proposed to use the material Invar as the housing material for a housing in which the piezo actuator is arranged.
- Invar is an iron-based material to which nickel of 30-45% or nickel of 30-45% and additionally cobalt up to 20% are added as essential elements.
- Such a housing material can compensate for thermal changes in length, since Invar has a similar coefficient of thermal expansion as the piezoceramic of the piezo actuator, but Invar is an extremely expensive material, so that the costs of such injection devices with piezo actuators are very high.
- the piezo actuator according to the invention with the features of claim 1 comprises a housing made of a ceramic material, the ceramic material having a thermal expansion coefficient of at most 7 ⁇ 10 6 ⁇ 1 / K.
- a ceramic material for the housing, temperature-related changes in length of the piezo ceramic are compensated for by corresponding changes in length of the ceramic housing.
- Invar the expensive material
- the use of the expensive material Invar can be dispensed with and an optimal temperature adjustment can be achieved.
- the use of a ceramic housing enables an even more rigid housing, since the ceramic materials tend to have a higher modulus of elasticity than the metallic housings previously used.
- a smaller wall thickness of the ceramic housing can still be realized, which has an overall advantageous effect on the weight of the piezo actuator.
- the ceramic material is particularly preferred aluminum nitrite (AlN), silicon carbide (SiC), silicon nitrite (Si 3 N) or cordierite ceramic (MgO-Al0 3 -Si0 2 ). These ceramic materials have excellent temperature compensation properties corresponding to the piezoceramic for a temperature range from -50 ° C to 200 ° C.
- the head plate is preferably glued to the housing.
- Another preferred way of fastening the head plate to the housing can be realized by soldering directly to the housing. Direct soldering with active solders can be used.
- the head plate and the housing are connected via a mechanical connection, in particular a threaded connection or a reef, connected.
- This mechanical connection can also be implemented particularly cost-effectively, and the required tightness can also be maintained.
- the mechanical connection is preferably secured by means of several press-in pills.
- the press-in pills are, for example, caulked into bores in the ceramic housing at the level of the head plate.
- the press-in pills are preferably made of a relatively easily deformable steel, e.g. Cq35. For example, 6 to 8 press-in pills are used, which are equally distributed along the circumference of the head plate.
- the ceramic housing is preferably provided with a metallization at the end facing the head plate.
- a metal ring is preferably soldered to the end of the ceramic housing facing the head plate.
- a head lath made of steel, for example, can then be welded onto this metal ring, in particular by means of laser welding.
- a metal ring is preferably soldered to the end of the ceramic housing directed towards a base plate.
- the ceramic housing can also have a metallization in the area of the soldering.
- a membrane provided on the base plate can also be firmly and tightly connected to both the base plate and the metal ring by means of welding.
- the head plate is attached to the ceramic housing by means of different joining technologies.
- joining technologies for example, direct soldering of the head plate to the ceramic housing or mechanical connection technology, for example by means of threads or grooves or corrugations or caulking.
- Another possibility for realizing the method according to the invention is the soldering of a steel ring to one or both ends of the ceramic housing and a subsequent attachment of a head plate or a base plate together with a membrane, for example by means of welding.
- the ceramic housing is preferably metallized in order to simplify the soldering or welding process.
- the present invention is particularly applicable to memory injection systems such as Common rail systems used.
- FIG. 1 shows a schematic sectional view of a piezo actuator according to a first exemplary embodiment of the present invention
- Figure 2 is a schematic sectional view of a piezo . , , Actuators according to a second exemplary embodiment of the present invention.
- FIG. 3 shows a schematic sectional view of a piezo actuator according to a third exemplary embodiment of the present invention.
- the piezo actuator 1 comprises a piezo ceramic 10, which is arranged in an essentially tubular housing 2.
- the tubular housing 2 can have a round or angular or any other transverse have cut.
- the housing 2 is made of a ceramic material.
- the ceramic material of the housing 2 is selected such that its coefficient of thermal expansion corresponds approximately to that of the piezoceramic 10. As a result, temperature-related changes in length of the piezoceramic can be compensated for by corresponding changes in length of the housing in the longitudinal direction XX.
- a head plate 3 is arranged at one end of the housing 2.
- the head plate 3 is connected to the ceramic housing 2 by means of a mechanical connection via a thread.
- a plurality of pressed beads 4 made of a steel material are provided, which are each arranged in bores 15 which are formed in the ceramic housing 2 at the level of the head plate.
- the press beads 4 are fastened to the head plate 3 by caulking, so that the head plate 3 is fixed to the ceramic housing 2.
- a piezo actuator 1 according to a second exemplary embodiment of the present invention is described below with reference to FIG.
- the head plate 3 is connected to the ceramic housing 2 by means of soldering.
- the head plate 3 is soldered to the end of the ceramic housing 2 such that it forms a flat termination with the housing 2. This results in an annular solder connection with a height that corresponds approximately to the thickness of the top plate 3 (cf. FIG. 2).
- a steel ring 6 is soldered to the end of the ceramic housing 2 facing the head plate by means of a solder connection 8.
- the head plate 3 is in turn means of a welded joint 7, in particular by means of laser welding, connected to the steel ring 6.
- a steel ring 11 is also attached to the end of the ceramic housing 2 facing a base plate 9 by means of a soldered connection 12.
- the bottom plate 9 is in turn connected by a membrane 14 which is welded to both the bottom plate 9 and the steel ring 11.
- This membrane 14 enables the very small stroke of the piezoceramic 10 to be passed on via the base plate 9.
- the membrane 14 is preferably welded to the step-shaped transition of the base plate 9 between the two different diameter areas of the base plate 9. In this way, a base plate can also be attached in the first two exemplary embodiments.
- an additional annular seal 13 is preferably arranged between the base plate 9 and the steel ring 11.
- the temperature compensation is also provided in the third exemplary embodiment by the approximately equal coefficients of thermal expansion of the housing 2 and the piezoceramic 10.
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
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP03773487A EP1556907A1 (de) | 2002-10-07 | 2003-10-02 | Piezoaktuator für eine einspritzvorrichtung |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10246691A DE10246691A1 (de) | 2002-10-07 | 2002-10-07 | Einspritzvorrichtung |
DE10246691.2 | 2002-10-07 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2004034481A1 true WO2004034481A1 (de) | 2004-04-22 |
Family
ID=32038288
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE2003/003287 WO2004034481A1 (de) | 2002-10-07 | 2003-10-02 | Piezoaktuator für eine einspritzvorrichtung |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1556907A1 (de) |
DE (1) | DE10246691A1 (de) |
WO (1) | WO2004034481A1 (de) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1783842A1 (de) * | 2005-11-04 | 2007-05-09 | Delphi Technologies, Inc. | Aktuatoranordnung |
EP2330288A1 (de) * | 2009-11-23 | 2011-06-08 | Robert Bosch GmbH | Brennstoffeinspritzventil |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102005025147B4 (de) * | 2005-06-01 | 2014-11-06 | Continental Automotive Gmbh | Kraftstoffinjektor mit Gehäuse, sowie Verfahren zum Fertigstellen und Beschriften des Gehäuses |
EP1816340B1 (de) * | 2006-02-03 | 2010-04-07 | Continental Automotive Italy S.p.A. | Flüssigkeitsinjector |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19702066A1 (de) * | 1997-01-22 | 1998-07-23 | Daimler Benz Ag | Piezoelektrischer Injektor für Kraftstoffeinspritzanlagen von Brennkraftmaschinen |
DE19928183A1 (de) * | 1999-06-19 | 2001-01-04 | Bosch Gmbh Robert | Piezoaktor |
DE19948359A1 (de) * | 1999-10-07 | 2001-01-11 | Siemens Ag | Aktoreinheit mit Keramikelement zur Temperaturkompensation |
DE10037743A1 (de) * | 2000-08-02 | 2002-02-21 | Siemens Ag | Piezo-Aktuator |
-
2002
- 2002-10-07 DE DE10246691A patent/DE10246691A1/de not_active Ceased
-
2003
- 2003-10-02 EP EP03773487A patent/EP1556907A1/de not_active Ceased
- 2003-10-02 WO PCT/DE2003/003287 patent/WO2004034481A1/de not_active Application Discontinuation
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19702066A1 (de) * | 1997-01-22 | 1998-07-23 | Daimler Benz Ag | Piezoelektrischer Injektor für Kraftstoffeinspritzanlagen von Brennkraftmaschinen |
DE19928183A1 (de) * | 1999-06-19 | 2001-01-04 | Bosch Gmbh Robert | Piezoaktor |
DE19948359A1 (de) * | 1999-10-07 | 2001-01-11 | Siemens Ag | Aktoreinheit mit Keramikelement zur Temperaturkompensation |
DE10037743A1 (de) * | 2000-08-02 | 2002-02-21 | Siemens Ag | Piezo-Aktuator |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1783842A1 (de) * | 2005-11-04 | 2007-05-09 | Delphi Technologies, Inc. | Aktuatoranordnung |
US7687970B2 (en) | 2005-11-04 | 2010-03-30 | Delphi Technologies, Inc. | Actuator arrangement |
EP2330288A1 (de) * | 2009-11-23 | 2011-06-08 | Robert Bosch GmbH | Brennstoffeinspritzventil |
Also Published As
Publication number | Publication date |
---|---|
EP1556907A1 (de) | 2005-07-27 |
DE10246691A1 (de) | 2004-04-22 |
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