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公开(公告)号：DE102015114453A1
公开(公告)日：2016-03-03
申请号：DE102015114453
申请日：2015-08-31
Applicant: DENSO CORP
Inventor： DEGUCHI MASATAKA , OSAMURA HIRONORI , TERADA KANECHIYO , WADA JUNICHI , SHIBATA MASAMICHI , TSUKAMOTO YUUKI
IPC: H01T13/20
Abstract: Eine Zündkerze beinhaltet ein rohrförmiges Gehäuse, einen rohrförmigen Isolator, der in dem Gehäuse gehalten wird, eine Mittelelektrode, die in dem Isolator befestigt ist, wobei ein distaler Endbereich der Mittelelektrode nach außerhalb des Isolators vorsteht; und eine ringförmige Masseelektrode, die an einem distalen Ende des Gehäuses befestigt ist. Das Gehäuse weist, an dem distalen Ende desselben, einen kleinen Innendurchmesser aufweisenden Bereich auf, der einen kleineren Innendurchmesser aufweist als andere Bereiche des Gehäuses. Die ringförmige Masseelektrode ist auf einer distalen Endoberfläche des einen kleinen Innendurchmesser aufweisenden Bereichs des Gehäuses so angeordnet, dass eine innere Umfangsoberfläche der Masseelektrode einer äußeren Umfangsoberfläche des distalen Endbereichs der Mittelelektrode über eine dazwischen ausgebildete Funkenstrecke gegenüberliegt. Der Außendurchmesser der Masseelektrode ist kleiner als der Außendurchmesser der distalen Endoberfläche des einen kleinen Innendurchmesser aufweisenden Bereichs des Gehäuses.
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公开(公告)号：DE19641856B4
公开(公告)日：2006-02-02
申请号：DE19641856
申请日：1996-10-10
Applicant: DENSO CORP
Inventor： ABE NOBUO , OSAMURA HIRONORI
Abstract: Center and earth electrodes are melted at the predetermined regions on the tip thereof where noble metallic chips are fixed. Then, the noble metallic chips are sunk in the melted portions of these center and earth electrodes so as to form protruding portions along outer peripheries of the noble metallic chips. Thus, the noble metallic chips are fixed to the electrodes through the protruding portions. Next, the noble metallic chips are irradiated by energy-condensing light through the protruding portions thus formed. With this irradiation, the center electrode is welded to one noble metallic chip, while the earth electrode is welded to the other noble metallic chip.
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公开(公告)号：DE69924344D1
公开(公告)日：2005-04-28
申请号：DE69924344
申请日：1999-12-03
Applicant: DENSO CORP
Inventor： ISHINO YASUTAKE , OSAMURA HIRONORI , YATOU MAKOTO
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公开(公告)号：DE19719937C2
公开(公告)日：2003-09-25
申请号：DE19719937
申请日：1997-05-13
Applicant: DENSO CORP
Inventor： OSAMURA HIRONORI , ABE NOBUO
Abstract: A process of producing a spark plug having an improved consumption resistance is provided. The spark plug comprises a noble metal chip composed of an Iridium (Ir) alloy material and includes an insulator enclosing a center electrode and a ground electrode, which has a facing portion facing the tip of the center electrode. The chip may be disposed on the tip of the center electrode, the facing portion of the ground electrode or both. The Ir alloy material consists of Ir and a metal that has a higher oxidation resistance than Ir and forms a solid solution with Ir at all proportions to prevent oxidation evaporation of Ir. In order to prevent surface cracking, the chip is produced by elongating an ingot of the Ir alloy material through hot forging to form a bar having a fine fiber texture. Then, the chip is hot rolled, hot wire drawn and cut to the desired length.
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公开(公告)号：GB2306196B
公开(公告)日：1999-01-20
申请号：GB9621237
申请日：1996-10-11
Applicant: DENSO CORP
Inventor： ABE NOBUO , OSAMURA HIRONORI
Abstract: Center and earth electrodes are melted at the predetermined regions on the tip thereof where noble metallic chips are fixed. Then, the noble metallic chips are sunk in the melted portions of these center and earth electrodes so as to form protruding portions along outer peripheries of the noble metallic chips. Thus, the noble metallic chips are fixed to the electrodes through the protruding portions. Next, the noble metallic chips are irradiated by energy-condensing light through the protruding portions thus formed. With this irradiation, the center electrode is welded to one noble metallic chip, while the earth electrode is welded to the other noble metallic chip.
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Patent Agency Ranking
公开(公告)号：CA2291351C
公开(公告)日：2004-03-16
申请号：CA2291351
申请日：1999-12-01
Applicant: DENSO CORP
Inventor： YATOU MAKOTO , ISHINO YASUTAKE , OSAMURA HIRONORI
Abstract: In a spark plug having a center electrode, first and second ground electrodes, an insulator and a metal housing, a first discharge gap is constituted between a front end of the center electrode and a front side of the first ground electrode and a second discharge gap is constituted between a front end of the second electrode and a front side of the center electrode. Respective dimensional relationships of A, B, C, H, F and L1 are defined where A is a distance of the first discharge gap, B is a shortest distance between the front end of the second ground electrode and the insulator, C is an axial length from a leading end of the metal housing and a front end of the insulator, H is an axial length from the front end of the insulator and the front end of the center electrode, F is an axial length from the front end of the insulator to the front end edge of the second electrode and L1 is a shortest axial length from the leading end of the metal housing to the front end of the second ground electrode.
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公开(公告)号：DE19650728A1
公开(公告)日：1997-06-12
申请号：DE19650728
申请日：1996-12-06
Applicant: DENSO CORP
Inventor： OSAMURA HIRONORI
Abstract: Spark plug has: (a) a nickel alloy central electrode (3) with a tip (3a); (b) an insulator (2) which covers the edge of the central electrode except for its tip and which optionally also has a tip (2b); (c) a fitting (1) which surrounds the insulator edge and which has an external thread, a space (7) formed between the fitting and the insulator and exposing the insulator tip (2b); (d) an iridium (alloy) tip (51) on the tip (3b) of the central electrode (3); and (e) an earth electrode (4) fixed on the fitting (1) and spaced from and facing the iridium (alloy) tip (51). Dimensions of the spark plug are as follows: discharge gap (6) length (A) = 0.9 to 1.35 mm.; space (7) width (B) \- (10/9)A; insulator (2) projection length (C) = 1.0 to 2.5 mm.; external diameter (D) of fitting threaded section = 10 to 12 mm.; central electrode tip diameter (F) = 2.0 to 2.7 mm.; iridium (alloy) tip (51) end diameter (G) = 0.6 to 0.9 mm.; and iridium (alloy) tip (51) projection height (H) = 0.3 to 1.0 mm.
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公开(公告)号：DE19641856A1
公开(公告)日：1997-04-17
申请号：DE19641856
申请日：1996-10-10
Applicant: DENSO CORP
Inventor： ABE NOBUO , OSAMURA HIRONORI
Abstract: Center and earth electrodes are melted at the predetermined regions on the tip thereof where noble metallic chips are fixed. Then, the noble metallic chips are sunk in the melted portions of these center and earth electrodes so as to form protruding portions along outer peripheries of the noble metallic chips. Thus, the noble metallic chips are fixed to the electrodes through the protruding portions. Next, the noble metallic chips are irradiated by energy-condensing light through the protruding portions thus formed. With this irradiation, the center electrode is welded to one noble metallic chip, while the earth electrode is welded to the other noble metallic chip.
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公开(公告)号：DE102016117149A1
公开(公告)日：2017-03-16
申请号：DE102016117149
申请日：2016-09-13
Applicant: DENSO CORP
Inventor： DEGUCHI MASATAKA , MASAMICHI SHIBATA , TERADA KANECHIYO , MIWA TETSUYA , OSAMURA HIRONORI , TSUKAMOTO YUUKI
IPC: H01T13/00
Abstract: Es wird eine Zündkerze für einen Verbrennungsmotor bereitgestellt, die ein Gehäuse, einen Porzellanisolator, eine Mittelelektrode, und eine ringförmige Masseelektrode beinhaltet. Das Gehäuse besitzt einen Abschnitt mit kleinem Durchmesser, der einen kleineren Innendurchmesser besitzt und ein vorderes Ende davon definiert. Die Masseelektrode ist an eine vordere Endfläche des Abschnitts mit kleinem Durchmesser gesichert und bildet einen Zündspalt zwischen sich und einem Außenumfang der Mittelelektrode. Eine Aussparung ist zwischen dem Innenumfang des Gehäuses und einem Abschnitt des Porzellanisolators gebildet, die sich näher an einem vorderen Ende des Porzellanisolators befindet als die Anlageschulter. Eine Entlüftung erstreckt sich von außerhalb der Masseelektrode in einer Radialrichtung der Zündkerze zu der Aussparung, um eine Kommunikation bzw. Verbindung zwischen der Aussparung und der Brennkammer des Verbrennungsmotors herzustellen.
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公开(公告)号：GB2381042A8
公开(公告)日：2006-01-31
申请号：GB0219863
申请日：2002-08-27
Applicant: DENSO CORP
Inventor： HORI TSUNENOBU , MIZUTANI AKIHIKO , OSAMURA HIRONORI , TAKAMURA KOZO
Abstract: An improved structure of a spark plug which provides higher durability of a joint of a noble metal chip to an electrode such as a center or a ground electrode. The joint is formed by laser welding. A fused portion made of materials of the noble metal chip and the electrode fused together by the laser welding is formed in the joint so that it may continue over at least half a circumference of a contact between the noble metal chip and the electrode without interfaces of welds, thereby enhancing the activity of the fused portion as a thermal stress absorber. A welding method is also provided.
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