EP2003753A1 - Ignition plug and method for the manufacture of an ignition plug - Google Patents
Ignition plug and method for the manufacture of an ignition plug Download PDFInfo
- Publication number
- EP2003753A1 EP2003753A1 EP08010005A EP08010005A EP2003753A1 EP 2003753 A1 EP2003753 A1 EP 2003753A1 EP 08010005 A EP08010005 A EP 08010005A EP 08010005 A EP08010005 A EP 08010005A EP 2003753 A1 EP2003753 A1 EP 2003753A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- inner conductor
- insulator
- spark plug
- coextrusion
- center electrode
- 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.)
- Granted
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
- H01T13/00—Sparking plugs
- H01T13/20—Sparking plugs characterised by features of the electrodes or insulation
- H01T13/38—Selection of materials for insulation
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
- H01T21/00—Apparatus or processes specially adapted for the manufacture or maintenance of spark gaps or sparking plugs
- H01T21/02—Apparatus or processes specially adapted for the manufacture or maintenance of spark gaps or sparking plugs of sparking plugs
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Spark Plugs (AREA)
- Ceramic Products (AREA)
Abstract
Description
Die Erfindung betrifft eine Zündkerze für Verbrennungsmotoren mit einer Außenelektrode, einer Mittelelektrode, einem an die Mittelelektrode angeschlossenen Innenleiter und einem den Innenleiter umgebenden Isolatorkörper sowie ein Verfahren zur Herstellung einer solchen Zündkerze.The invention relates to a spark plug for internal combustion engines having an outer electrode, a center electrode, an inner conductor connected to the center electrode and an insulator body surrounding the inner conductor and a method for producing such a spark plug.
Zündkerzen müssen im Betrieb Druck- und Temperaturbelastungen Stand halten, die hohe Anforderungen an die mechanische Festigkeit des Isolatorkörpers und die Abdichtung von Grenzflächen zwischen verschiedenen Kerzenteilen gegenüber dem Verbrennungsraum eines Motors stellen. Bei hohen Spitzendrücken kann es trotz maßgenauer Fertigung und sorgfältiger Abdichtung dazu kommen, dass Gase aus dem Verbrennungsraum über unzureichende Dichtstellen der Zündkerze als Leckagegase austreten. Derartige Leckagegase, die beispielsweise entlang von Grenzflächen zwischen der Mittelelektrode und dem Isolatorkörper bzw. dem Innenleiter und dem umgebenden Isolatorkörper einsickern, können im Inneren der Zündkerze zu Ablagerungen führen, welche die Gefahr von Nebenschlüssen erhöhen und so die Lebensdauer einer Zündkerze begrenzen.In operation, spark plugs must withstand pressure and temperature stresses which place high demands on the mechanical strength of the insulator body and the sealing of interfaces between different parts of the spark plug relative to the combustion chamber of an engine. At high peak pressures, it may happen despite accurate production and careful sealing that gases from the combustion chamber leak through insufficient sealing points of the spark plug as leakage gases. Such leakage gases, which seep in, for example, along interfaces between the center electrode and the insulator body or the inner conductor and the surrounding insulator body, can lead to deposits inside the spark plug, which increase the risk of shunts and thus limit the life of a spark plug.
Diese Anforderungen an Zündkerzen werden durch einen Trend zur Miniaturisierung, der beispielsweise bei Anwendungen für den Rennsport mit höchsten Anforderungen an die Belastbarkeit einhergeht, noch verschärft.These spark plug requirements are exacerbated by a trend towards miniaturization, which, for example, is associated with the highest demands on load capacity in racing applications.
Aufgabe der Erfindung ist es deshalb, einen Weg aufzuzeigen, wie die hohen Anforderungen, die an Zündkerzen gestellt werden, besser erfüllt werden können.The object of the invention is therefore to show a way how the high demands that are placed on spark plugs, can be better met.
Diese Aufgabe wird erfindungsgemäß mit einer Zündkerze der eingangs genannten Art dadurch gelöst, dass der Isolatorkörper extrudiert ist. Es hat sich gezeigt, dass durch Extrusion Isolatorkörper für Zündkerzen hergestellt werden können, die verbesserte Materialeigenschaften und damit eine verbesserte Belastbarkeit aufweisen. Die verbesserten Materialeigenschaften ermöglichen eine verstärkte Miniaturisierung, so dass erfindungsgemäße Zündkerzen mit kleineren Außengewinden, insbesondere Gewindegrößen M12, M10 und sogar M8, geschaffen werden können. Dies ist beispielsweise für Rennsportmotoren und ähnliche Anwendungen, bei denen der für Zündkerzen benötigte Raum möglichst klein sein sollte und trotzdem höchste Drehzahlen benötigt werden, ein wichtiger Vorteil.This object is achieved with a spark plug of the type mentioned in that the insulator body is extruded. It has been found that by extrusion insulator body for spark plugs can be produced, which have improved material properties and thus an improved load capacity. The improved material properties allow for increased miniaturization, so that inventive spark plugs with smaller external threads, in particular thread sizes M12, M10 and even M8, can be created. This is an important advantage, for example, for racing engines and similar applications, where the space required for spark plugs should be as small as possible and still require the highest speeds.
Die Vorteile eine Herstellung durch Extrusion lassen sich in verstärktem Maße nutzen, indem der Innenleiter zusammen mit dem Isolatorkörper durch Koextrusion gefertigt wird, was bevorzugt ist. Indem der Innenleiter zusammen mit dem Isolatorkörper koextrudiert wird, lässt sich der Aufwand, einen separat hergestellten Innenleiter in den Isolatorkörper einzubringen einsparen. Ferner lassen sich durch Koextrusion Leckagestellen zwischen dem Innenleiter und dem umgebenden Isolatorkörper praktisch vollständig vermeiden, so dass auf diese Weise der Gefahr eines Einsickerns von Verbrennungsgasen aus dem Verbrennungsraum eines Motors wirksam begegnen werden kann. Ein weiterer Vorteil der Koextrusion von Isolatorkörper und Innenleiter besteht darin, dass die zu einer erhöhten mechanischen Festigkeit führt.The advantages of production by extrusion can be used to a greater extent by the inner conductor is made together with the insulator body by coextrusion, which is preferred. By co-extruding the inner conductor together with the insulator body, it is possible to save the expense of introducing a separately produced inner conductor into the insulator body. Furthermore, by coextrusion leaks between the inner conductor and the surrounding insulator body can be virtually completely avoided, so that in this way the risk of seepage of combustion gases from the combustion chamber of an engine can be effectively counteracted. Another advantage of the coextrusion of insulator body and inner conductor is that it leads to increased mechanical strength.
Bevorzugt wird bei einer erfindungsgemäßen Zündkerze für den Innenleiter eine elektrisch leitende Keramik verwendet. Während im Stand der Technik gebräuchliche Innenleiter aus Glas, die beispielsweise durch eingelagerte Kohlenstoffpartikel einen Entstörwiderstand bilden, nur mit sehr großem Aufwand gegen den umgebenden Isolatorkörper abgedichtet werden können und in einem aufwendigen Fertigungsschritt in den Isolatorkörper eingebracht werden müssen, kann ein Innenleiter aus einer elektrisch leitenden Keramik zusammen mit dem Isolatorkörper durch Koextrusion gefertigt werden. Insbesondere kann durch die Zusammensetzung der Keramik des Innenleiters der von ihm gebildete Entstörwiderstand auf einfache Weise an die Anforderungen einer konkreten Produktserie innerhalb geringer Toleranzen angepasst werden. Dies ist ein weiterer Vorteil erfindungsgemäßer Zündkerzen.Preferably, an electrically conductive ceramic is used in a spark plug according to the invention for the inner conductor. While customary in the prior art inner conductor made of glass, which form a Entstörwiderstand example by embedded carbon particles, can be sealed against the surrounding insulator body only with great effort and in an elaborate manufacturing step in the insulator body must be introduced, an inner conductor of an electrically conductive ceramic can be made together with the insulator body by coextrusion. In particular, the composition of the ceramic of the inner conductor of the interference suppression resistor formed by it can be easily adapted to the requirements of a specific product series within narrow tolerances. This is another advantage of spark plugs according to the invention.
Den Keramikmaterialien für den Isolatorkörper und gegebenenfalls den Innenleiter können für die Extrusion bzw. Koextrusion Plastifizierungsmittel, beispielsweise Wasser, Parafin oder Polymere zugesetzt werden, damit die Keramikmaterialen eine für eine Extrusion geeignete Plastizität und pastöse Konsistenz erhalten. Durch Extrusion, bevorzugt durch Koextrusion, der Keramikmaterialen wird zunächst ein Grünling hergestellt, der bevorzugt eine zylindrische Form hat. Der Grünling kann wegen der Plastizität der extrudierten Materialen mit geringem Aufwand Form gebend bearbeitet werden, beispielsweise auf die gewünschte Länge zugeschnitten und durch Bearbeitung seiner Außenkontur mit einem für den Isolatorkörper einer Zündkerze typischen Ringwulst versehen werden. Durch wässrige/thermische Entbinderung und Brennen können eventuell vorhandene Plastifizierungsmittel aus dem Grünling ausgetrieben und die zunächst plastischen Keramikmaterialien gesintert werden, um den Innenleiter und den ihn umgebenden Isolatorkörper einer Zündkerze zu bilden.Plasticizers, for example water, paraffin or polymers may be added to the ceramic materials for the insulator body and optionally the inner conductor for the extrusion or coextrusion, so that the ceramic materials have a plasticity and pasty consistency suitable for extrusion. By extrusion, preferably by coextrusion, the ceramic materials, a green compact is first produced, which preferably has a cylindrical shape. Due to the plasticity of the extruded materials, the green compact can be shaped with little effort, for example, cut to the desired length and provided by machining its outer contour with a ring bead typical of the insulator body of a spark plug. By aqueous / thermal debinding and firing possibly existing plasticizer can be expelled from the green compact and the first plastic ceramic materials are sintered to form the inner conductor and the surrounding insulator body of a spark plug.
Für den Innenleiter können beispielsweise Silicide, Karbide, Nitride und/oder Boride verwendet werden. Als Metallbestandteil der Silizide, Karbide und/oder Boride, aus denen die Keramik des Innenleiters bestehen kann, können beispielsweise Molybdän, Wolfram, Titan und/oder Lanthan verwendet werden. Für die Koextrusion mit einer derartigen Innenleiterkeramik ist als Material für den Isolatorkörper insbesondere eine Nichtoxidkeramik auf Basis von Karbiden, Nitriden und/oder Boriden der Metalle Si, Al und/oder Ti geeignet. Besonders günstig ist beispielsweise die Kombination einer Si3N4-Keramik für den Isolatorkörper und MoSi2 als Material für den Innenleiter.For example, silicides, carbides, nitrides and / or borides can be used for the inner conductor. As the metal component of the silicides, carbides and / or borides, from which the ceramic of the inner conductor may consist, for example, molybdenum, tungsten, titanium and / or lanthanum can be used. For coextrusion with such an inner conductor ceramic, a non-oxide ceramic based on carbides, nitrides and / or borides of the metals Si, Al and / or Ti is particularly suitable as the material for the insulator body. For example, the combination of a Si 3 N 4 ceramic for the insulator body and MoSi 2 as a material for the inner conductor is particularly favorable.
Eine weitere Möglichkeit besteht darin, den Isolatorkörper überwiegend oder sogar vollständig aus Al2O3 zu fertigen und als Keramikmaterial für den Innenleiter einen Kompositwerkstoff aus Al2O3 mit LaCrO3 und/oder TiN zu verwenden.Another possibility is to produce the insulator body predominantly or even completely from Al 2 O 3 and to use as a ceramic material for the inner conductor a composite material of Al 2 O 3 with LaCrO 3 and / or TiN.
Bevorzugt ist, dass die Mittelelektrode mit dem Innenleiter verlötet ist. Bevorzugt ist ferner, dass der Innenleiter an seinem von der Mittelelektrode abgewandten Ende mit einem Zündstift verlötet ist, insbesondere dass der Zündstift in den Isolator hineinragt. Bevorzugt ist ferner, dass der Isolator von einem metallischen Zündkerzenkörper umgeben ist, wobei der Isolatorkörper mittels einer Lötverbindung mit dem metallischen Zündkerzenkörper verbunden ist. Bevorzugt ist ferner, dass die Zündkerze einen metallischen Zündkerzenkörper hat, der zum Einschrauben in einen Motor ein Außengewinde trägt, das eine Gewindegröße von M12 oder weniger, vorzugsweise M10 oder M8, aufweist.It is preferred that the center electrode is soldered to the inner conductor. It is further preferred that the inner conductor is soldered at its end facing away from the central electrode end with a firing pin, in particular that the firing pin protrudes into the insulator. It is further preferred that the insulator is surrounded by a metallic spark plug body, wherein the insulator body is connected by means of a solder connection to the metallic spark plug body. It is further preferred that the spark plug has a metallic spark plug body, which carries an external thread for screwing into a motor, which has a thread size of M12 or less, preferably M10 or M8.
Bei einem erfindungsgemäßen Verfahren zur Herstellung einer Zündkerze ist bevorzugt, dass durch Koextrusion zunächst ein Grünling hergestellt wird, der außen ein erstes Material zur Ausbildung des Isolators und innen ein weiteres Material zur Ausbildung des Innenleiters aufweist, und der Grünling später gebrannt wird. Bevorzugt wird der Grünling vor dem Brennen formgebend zur Ausbildung eines Bundes des Isolators bearbeitet. Dabei ist bevorzugt, dass die formgebende Bearbeitung mittels Drehen oder Schleifen erfolgt.In a method according to the invention for the production of a spark plug it is preferred that a green compact is first produced by coextrusion which has a first material for forming the insulator on the outside and another material for forming the inner conductor on the inside, and the green body is subsequently fired. Preferably, the green body is processed before firing shaping to form a federation of the insulator. It is preferred that the shaping processing takes place by means of turning or grinding.
Bevorzugt wird der der Innenleiter an seinem hinteren Ende aufgebohrt und in die so geschaffene Bohrung ein Zündstift eingesetzt. Bevorzugt wird der Zündstift mit dem Innenleiter verlötet wird. Bevorzugt wird der Isolator mit einem ihn umgebenden Zündkerzenkörper verlötet.Preferably, the inner conductor is drilled at its rear end and inserted into the bore thus created a firing pin. Preferably, the firing pin is soldered to the inner conductor. Preferably, the insulator is soldered to a spark plug body surrounding it.
Weitere Einzelheiten und Vorteile der Erfindung werden im Folgenden anhand eines Ausführungsbeispieles unter Bezugnahme auf die beigefügten Zeichnungen erläutert. Die dabei beschriebenen Merkmale können einzeln oder in Kombination zum Gegenstand von Ansprüchen gemacht werden.Further details and advantages of the invention will be explained below with reference to an embodiment with reference to the accompanying drawings. The features described herein can be made individually or in combination to the subject of claims.
Es zeigen:
Figur 1- einen Innenleiter mit koextrudiertem Isolatorkörper als Halbzeug zur Herstellung einer Zündkerze;
Figur 2- ein Ausführungsbeispiel einer erfindungsgemäßen Zündkerze, die unter Verwendung des in
gezeigten Halbzeugs hergestellt wurde.Figur 1
- FIG. 1
- an inner conductor with co-extruded insulator body as a semi-finished product for producing a spark plug;
- FIG. 2
- an embodiment of a spark plug according to the invention, using the in
FIG. 1 produced semifinished product was produced.
Bei dem in
Für den Isolatorkörper 3 kann beispielsweise auch eine Keramik auf Basis von Al2O3 verwendet werden. In einem solchen Fall ist es für die Koextrusion günstig, für den Innenleiter ebenfalls eine Oxid-Keramik, insbesondere ebenfalls auf Basis von Al2O3, zu verwenden. Gut geeignet sind hierfür Komposite auf Basis von Al2O3TiN und/oder Al2O3-LaCrO3.For example, a ceramic based on Al 2 O 3 can also be used for the
Der in
In entsprechender Weise wird der Innenleiter 2 auch an seinem hinteren Ende aufgebohrt. Die auf diese Weise erzeugte Bohrung 6 ist in
In
Die Mittelelektrode 10 ist mittels einer Lötverbindung 15 mit dem sie umschließenden Isolator 3 verbunden. Auf diese Weise kann eine hervorragende Abdichtung zwischen der Mittelelektrode 10 und dem Isolator 3 erreicht werden, die ein Einsickern von Gasen aus dem Verbrennungsraum eines Motors entlang der Mittelelektrode 10 und dem Innenleiter 2 erschwert. Die dargestellte Zündkerze wird über einen Zündstift 11, der in die in
Um einem Austreten von Verbrennungsgasen aus dem Motorraum zusätzlich entgegen zu wirken, ist bei dem in
Eine verbesserte Abdichtung zwischen dem Isolator 3 und dem ihn umgebenden Zündkerzenkörper 13 kann im übrigen auch durch Warmschrumpfen erreicht werden. Hierfür wird der Isolator 3 in einen erhitzten Zündkerzenkörper 13 eingebracht. Beim Abkühlen des Zündkerzenkörpers 13 schrumpft dieser und legt sich gasdicht an den Isolator 3 an.An improved seal between the
Eine verbesserte Abdichtung zwischen Isolator 3 und dem ihn umgebenden Zündkerzenkörper (13) kann auch bei einem Aufbau der Zündkerze gemäß dem Stand der Technik über einen Innendichtring vorgenommen werden, der durch Warmschrumpfen des Körpers in Längsrichtung gasdicht vorgespannt wird.An improved seal between the
- 1.1.
- GrünlingGreenfinch
- 2.Second
- Innenleiter / KeramikmaterialInner conductor / ceramic material
- 3.Third
- Isolator / KeramikmaterialInsulator / ceramic material
- 4.4th
- BundFederation
- 5.5th
- Bohrungdrilling
- 6.6th
- Bohrungdrilling
- 7.7th
- ------
- 8.8th.
- ------
- 9.9th
- ------
- 10.10th
- Mittelelektrodecenter electrode
- 11.11th
- Zündstiftfiring pin
- 12.12th
- Außenelektrode / MasseelektrodeOuter electrode / ground electrode
- 13.13th
- Zündkerzenkörperspark plug body
- 14.14th
- Außengewindeexternal thread
- 15.15th
- Lotverbindungsolder
- 16.16th
- Lotverbindungsolder
- 17.17th
- Lotverbindungsolder
Claims (15)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102007027319A DE102007027319A1 (en) | 2007-06-14 | 2007-06-14 | Spark plug and method of making a spark plug |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2003753A1 true EP2003753A1 (en) | 2008-12-17 |
EP2003753B1 EP2003753B1 (en) | 2011-05-04 |
Family
ID=39638925
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08010005A Not-in-force EP2003753B1 (en) | 2007-06-14 | 2008-05-31 | Ignition plug and method for the manufacture of an ignition plug |
Country Status (4)
Country | Link |
---|---|
US (1) | US7980908B2 (en) |
EP (1) | EP2003753B1 (en) |
AT (1) | ATE508507T1 (en) |
DE (2) | DE102007027319A1 (en) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102010011739B4 (en) * | 2010-03-17 | 2014-12-18 | Federal-Mogul Ignition Gmbh | Spark plug and method of making a spark plug |
DE102010022334B3 (en) * | 2010-06-01 | 2011-12-01 | Borgwarner Beru Systems Gmbh | HF ignition device |
DE102011081746A1 (en) * | 2011-08-29 | 2013-02-28 | Telsonic Holding Ag | Device and sonotrode for process technology |
JP6691379B2 (en) | 2012-05-07 | 2020-04-28 | フェデラル−モーグル・イグニション・リミテッド・ライアビリティ・カンパニーFederal−Mogul Ignition Llc | Shrink-fit ceramic center electrode |
US9698573B2 (en) | 2012-11-21 | 2017-07-04 | Federal-Mogul Ignition Company | Extruded insulator for spark plug and method of making the same |
CN112996593B (en) * | 2018-10-02 | 2023-04-18 | 哈佛学院院长及董事 | Hydrophobic barrier layer of ceramic indirect evaporative cooling system |
DE102019203913A1 (en) * | 2019-03-21 | 2020-09-24 | Robert Bosch Gmbh | Spark plug housing, spark plug and method of making a spark plug |
Citations (5)
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GB505085A (en) * | 1937-10-28 | 1939-04-28 | John Gabler | Improvements in or relating to sparking plugs |
GB714810A (en) * | 1951-09-18 | 1954-09-01 | Gen Motors Corp | Method of and apparatus for shaping ceramic articles before final firing |
US3537160A (en) | 1966-01-31 | 1970-11-03 | Magneti Marelli Spa | Method for the manufacture of spark plugs for internal combustion engines |
EP0333957A2 (en) * | 1988-03-21 | 1989-09-27 | Corning Glass Works | Laminated extruded thermal shock resistant articles and method for making such articles |
JPH01319282A (en) * | 1988-06-21 | 1989-12-25 | Ngk Spark Plug Co Ltd | Spark plug for internal combustion engine |
Family Cites Families (16)
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GB717555A (en) * | 1952-08-07 | 1954-10-27 | Arthur Abbey | Improvements in or relating to shaped silicon nitride bodies and their manufacture |
JPS5657282A (en) * | 1979-10-13 | 1981-05-19 | Ngk Spark Plug Co | Ignition plug |
US4400643A (en) * | 1979-11-20 | 1983-08-23 | Ngk Spark Plug Co., Ltd. | Wide thermal range spark plug |
DE3212770A1 (en) * | 1982-04-06 | 1983-10-06 | Bosch Gmbh Robert | METHOD FOR GAP-FREE INSTALLATION OF MIDDLE ELECTRODES IN THE INSULATING BODY OF SPARK PLUGS FOR INTERNAL COMBUSTION ENGINES |
DE3217951A1 (en) * | 1982-05-13 | 1983-11-17 | Robert Bosch Gmbh, 7000 Stuttgart | SPARK PLUG FOR INTERNAL COMBUSTION ENGINES |
JPS61230281A (en) * | 1985-04-04 | 1986-10-14 | 株式会社デンソー | Ignition plug |
DE68905734T2 (en) * | 1988-08-25 | 1993-07-08 | Ngk Spark Plug Co | METHOD FOR SHAPING CERAMIC INSULATORS FOR USE IN SPARK PLUGS. |
BR9904840A (en) * | 1998-02-27 | 2000-07-25 | Ngk Spark Plug Co | Spark plug, alumina insulator for spark plug and its manufacturing method |
DE10047499A1 (en) * | 2000-09-26 | 2002-04-11 | Bosch Gmbh Robert | Ignition spark plug for IC engine has central electrode secured in opening in foot part of cylindrical isolator via soldered or welded connection or radial compression joint |
US20080036241A1 (en) * | 2001-02-15 | 2008-02-14 | Integral Technologies, Inc. | Vehicle body, chassis, and braking systems manufactured from conductive loaded resin-based materials |
DE10353972B4 (en) * | 2003-11-19 | 2006-03-16 | Beru Ag | Method for producing ceramic glow plugs |
WO2005117220A2 (en) * | 2004-05-25 | 2005-12-08 | Integral Technologies, Inc. | Low cost spark plug manufactured from conductive loaded resin-based materials |
US7388323B2 (en) * | 2004-10-12 | 2008-06-17 | Ngk Spark Plug Co., Ltd. | Spark plug |
JP4293121B2 (en) * | 2004-11-29 | 2009-07-08 | 株式会社デンソー | Spark plug for internal combustion engine |
JP4658871B2 (en) * | 2005-09-01 | 2011-03-23 | 日本特殊陶業株式会社 | Spark plug |
JP4690230B2 (en) * | 2006-03-16 | 2011-06-01 | 日本特殊陶業株式会社 | Spark plug for internal combustion engine and method for manufacturing the same |
-
2007
- 2007-06-14 DE DE102007027319A patent/DE102007027319A1/en not_active Withdrawn
-
2008
- 2008-05-31 AT AT08010005T patent/ATE508507T1/en active
- 2008-05-31 DE DE502008003400T patent/DE502008003400D1/en active Active
- 2008-05-31 EP EP08010005A patent/EP2003753B1/en not_active Not-in-force
- 2008-06-12 US US12/138,343 patent/US7980908B2/en not_active Expired - Fee Related
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB505085A (en) * | 1937-10-28 | 1939-04-28 | John Gabler | Improvements in or relating to sparking plugs |
GB714810A (en) * | 1951-09-18 | 1954-09-01 | Gen Motors Corp | Method of and apparatus for shaping ceramic articles before final firing |
US3537160A (en) | 1966-01-31 | 1970-11-03 | Magneti Marelli Spa | Method for the manufacture of spark plugs for internal combustion engines |
EP0333957A2 (en) * | 1988-03-21 | 1989-09-27 | Corning Glass Works | Laminated extruded thermal shock resistant articles and method for making such articles |
JPH01319282A (en) * | 1988-06-21 | 1989-12-25 | Ngk Spark Plug Co Ltd | Spark plug for internal combustion engine |
Also Published As
Publication number | Publication date |
---|---|
US7980908B2 (en) | 2011-07-19 |
DE102007027319A1 (en) | 2008-12-18 |
ATE508507T1 (en) | 2011-05-15 |
EP2003753B1 (en) | 2011-05-04 |
US20080309214A1 (en) | 2008-12-18 |
DE502008003400D1 (en) | 2011-06-16 |
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