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公开(公告)号：US10084289B2
公开(公告)日：2018-09-25
申请号：US15576108
申请日：2016-05-16
Applicant: NGK SPARK PLUG CO., LTD.
Inventor： Takehito Kuno
Abstract: A spark plug includes a tube-shaped metal shell, an insulator having an outer circumference, at least part of which is held by the metal shell, the insulator including an axial hole extending along an axial line, a center electrode disposed in the axial hole, and a ground electrode fixed to the metal shell. The ground electrode includes an outer layer and an inner layer covered with the outer layer, the inner layer having a thermal conductivity higher than a thermal conductivity of the outer layer. A ratio L of L2 to L1 (=L2/L1) falls within a range of 5% to 50% where a width of the inner layer in a width direction of the ground electrode is denoted with L1 and a dimension of an oxide located in an interlayer portion between the outer layer and the inner layer in the width direction is denoted with L2.
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公开(公告)号：US10290999B2
公开(公告)日：2019-05-14
申请号：US15205099
申请日：2016-07-08
Applicant: NGK SPARK PLUG CO., LTD.
Inventor： Kazuki Koike , Takehito Kuno
Abstract: A base end portion of a ground electrode of a spark plug includes a skin portion, an intermediate portion, and a core portion 52. A center cross section CP containing the center axis PX of the spark plug and the center axis EX of the base end portion includes a first multilayer portion in which the intermediate portion is disposed inward of the skin portion and the core portion is disposed inward of the intermediate portion, and a second multilayer portion in which the skin portion and the core portion are in direct contact with each other. The center cross section CP includes an intersection point PI at which a first boundary line BLa between the metallic shell and the skin portion and a second boundary line between the metallic shell and the core portion meet with a third boundary line BLc.
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公开(公告)号：US11695257B2
公开(公告)日：2023-07-04
申请号：US17802334
申请日：2021-11-04
Applicant: NGK SPARK PLUG CO., LTD.
Inventor： Seiji Nakano , Takehito Kuno , Kota Yamauchi
Abstract: A spark plug has an insulator having a through hole formed along an axial direction, a center electrode which is partially inserted into a portion of the through hole on a forward end side in the axial direction, and a glass seal portion which is in contact with the insulator and the center electrode within the through hole, in which the glass seal portion contains glass and an electrically conductive substance. The glass contains an Si component and a B component in a total amount of 50 mass % or more, as reduced to SiO2 and B2O3, a Zn component in an amount of 20 mass % to 35 mass % as reduced to ZnO, and an alkali metal component. The glass contains, as the alkali metal component, an Na component in an amount less than 1 mass % as reduced to Na2O.
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公开(公告)号：US09783872B2
公开(公告)日：2017-10-10
申请号：US14758891
申请日：2014-01-08
Applicant: NGK SPARK PLUG CO., LTD. , HITACHI METALS, LTD.
Inventor： Osamu Yoshimoto , Tomonori Kanemaru , Takehito Kuno , Tomo-o Tanaka , Toshihiro Uehara
Abstract: An electrode material for at least one of a center electrode (5) and a ground electrode (27) provided with a chip (31, 32) for use in a spark plug (1). The electrode material contains Ni as a principal component, and has a Si content of from 0.50% to 1.0% by mass, an Al content of from 0.2% to 2.0% by mass, a Cr content of from 12% to 34% by mass, a rare-earth element or the like content of from 0.03% to 0.2% by mass, a Fe content of more than 0% but not more than 20% by mass, a C content of not more than 0.10% by mass, and a Mn content of not more than 1.0% by mass. The total content of Si and Al is not less than 0.80% by mass, and less than one tenth of the Cr content.
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