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公开(公告)号：US20190131776A1
公开(公告)日：2019-05-02
申请号：US16095788
申请日：2017-05-25
Applicant: NGK SPARK PLUG CO., LTD.
Inventor： Jumpei ISASA , Seiji NAKANO , Hirokazu KURONO , Kuniharu TANAKA , Yutaka YOKOYAMA , Haruki YOSHIDA , Shun KONDO
Abstract: Provided is a spark plug capable of ensuring fouling resistance with a simple configuration. An insulator includes a step portion formed on an outer circumferential surface thereof. A center electrode is arranged in an axial hole of the insulator. A cylindrical metal shell having a shelf portion formed on an inner circumferential surface thereof is arranged radially outside the insulator. The insulator further includes a front end portion located frontward of the step portion. An outer circumferential surface of the front end portion has an arithmetic average roughness of 0.5 μm or smaller in a circumferential direction. A recess is formed with a depth of 3 to 20 μm in at least part of an end surface and the outer circumferential surface of the front end portion so as to extend from the front toward the rear.
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公开(公告)号：US20190067914A1
公开(公告)日：2019-02-28
申请号：US16106103
申请日：2018-08-21
Applicant: NGK SPARK PLUG CO., LTD.
Inventor： Kazuhiro KUROSAWA , Katsuya TAKAOKA , Kota YOKOYAMA , Kuniharu TANAKA , Hirokazu KURONO , Hironori UEGAKI
IPC: H01T13/05
Abstract: A spark plug having a connection portion disposed between a metal terminal and a center electrode. The connection portion includes: a magnetic substance formed from a Fe-containing oxide; a conductor which is a wire helically disposed on an outer periphery of the magnetic substance and electrically connected to the metal terminal and the center electrode; and an intermediate member which is in contact with the magnetic substance, the conductor, and an inner peripheral surface of the insulator, is disposed between the magnetic substance and the conductor, and the inner peripheral surface of the insulator, and has lower electrical conductivity than the conductor. The conductor is made of one or more of an oxide conductor, carbon, and a carbon compound.
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公开(公告)号：US20180048126A1
公开(公告)日：2018-02-15
申请号：US15669536
申请日：2017-08-04
Applicant: NGK Spark Plug Co., LTD.
Inventor： Yutaka YOKOYAMA , Kuniharu TANAKA , Nobuyoshi ARAKI , Hirokazu KURONO , Toshimasa SAJI , Yusuke NOMURA , Jumpei ISASA
CPC classification number: H01T13/38 , C04B35/10 , C04B35/111 , C04B35/62655 , C04B35/63416 , C04B2235/3206 , C04B2235/3208 , C04B2235/3213 , C04B2235/3215 , C04B2235/3217 , C04B2235/3222 , C04B2235/3418 , C04B2235/3481 , C04B2235/5436 , C04B2235/5445 , C04B2235/6565 , C04B2235/6567 , C04B2235/85 , H01B3/12
Abstract: An alumina-based sintered body includes 92 mass % to 96 mass % of Al in terms of an oxide, and at least three elements selected from Group II elements, one of the at least three elements being 1.90 mass % or more of Ba in terms of an oxide. The alumina-based sintered body includes the following phases in a grain boundary phase present between alumina crystal grains: a first crystal phase containing Si and at least one of the Group II elements, and a second crystal phase containing Al and at least one of the Group II elements. In X-ray diffraction of the alumina-based sintered body, the maximum relative intensity of the first crystal phase and the maximum relative intensity of the second crystal phase are both 2 or above relative to the maximum diffraction intensity of the alumina crystal.
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公开(公告)号：US20160322789A1
公开(公告)日：2016-11-03
申请号：US15108075
申请日：2014-12-25
Applicant: NGK SPARK PLUG CO., LTD.
Inventor： Katsuya TAKAOKA , Kazuhiro KUROSAWA , Kuniharu TANAKA , Toshitaka HONDA , Hirokazu KURONO , Haruki YOSHIDA , Hironori UEGAKI
Abstract: A connection portion connecting a center electrode and a terminal metal fixture together in a through hole of the insulator includes a resistor and a magnetic substance structure including a magnetic substance and a conductor The connection portion further includes a first conductive sealing portion, a second conductive sealing portion and a third conductive sealing portion. The first conductive sealing portion is disposed on a leading end side of a first member and is in contact therewith. The second conductive sealing portion is disposed between the first member and a second member and is in contact with the first member and the second member. The third conductive sealing portion is disposed on a rear end side of the second member and is in contact therewith.
Abstract translation: 在绝缘子的通孔中连接中心电极和端子金属固定器的连接部分包括电阻器和包括磁性物质和导体的磁性物质结构。连接部分还包括第一导电密封部分，第二导电密封部分 部分和第三导电密封部分。 第一导电密封部分设置在第一构件的前端侧并与其接触。 第二导电密封部分设置在第一构件和第二构件之间并与第一构件和第二构件接触。 第三导电密封部分设置在第二构件的后端侧并与其接触。
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公开(公告)号：US20190115729A1
公开(公告)日：2019-04-18
申请号：US16156337
申请日：2018-10-10
Applicant: NGK SPARK PLUG CO., LTD.
Inventor： Toshinori TAKEICHI , Kuniharu TANAKA , Hirokazu KURONO , Haruki YOSHIDA , Hironori UEGAKI
Abstract: A spark plug having a resistor disposed between a metal terminal and a center electrode so as to be electrically connected to the metal terminal and the center electrode, wherein the resistor is in contact with an inner circumferential surface of the insulator. On a cross section taken along the axial line so as to include the axial line, in a case where a plurality of points are plotted at predetermined intervals in a direction of the axial line so as to be present on a partial boundary line, within an arbitrary range in the direction of the axial line, of a boundary line between the insulator and the resistor, and a regression line is drawn by a least-squares method with use of the plurality of points, an average value of distances in a direction perpendicular to the regression line between the regression line and the partial boundary line is 0.1 to 0.3 μm.
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Patent Agency Ranking
公开(公告)号：US20170288374A1
公开(公告)日：2017-10-05
申请号：US15465649
申请日：2017-03-22
Applicant: NGK SPARK PLUG CO., LTD.
Inventor： Hironori UEGAKI , Kazuhiro KUROSAWA , Katsuya TAKAOKA , Kuniharu TANAKA
Abstract: A spark plug includes a cylindrical metallic shell having a ground electrode at a forward end of the cylindrical metallic shell, a cylindrical insulator held in the metallic shell, a center electrode disposed in the insulator, a resistor element disposed in the insulator and having a forward end located rearward of a rear end of the center electrode, a forward-end-side electrically conductive seal layer disposed in the insulator to be located between the center electrode and the resistor element, and a rear-end-side electrically conductive seal layer disposed in the insulator to be located rearward of the resistor element. The forward end of the resistor element is located forward of the rear end of the metallic shell, and the rear end of the resistor element is located rearward of the rear end of the metallic shell.
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公开(公告)号：US20170214219A1
公开(公告)日：2017-07-27
申请号：US15315581
申请日：2015-06-02
Applicant: NGK SPARK PLUG CO., LTD.
Inventor： Katsuya TAKAOKA , Kazuhiro KUROSAWA , Kuniharu TANAKA , Hisashi KOZUKA , Toshitaka HONDA , Hirokazu KURONO , Haruki YOSHIDA , Hironori UEGAKI
Abstract: Disclosed is a spark plug capable of suppressing high-frequency noise by improving the material of an electrical connection part between a center electrode and a metal terminal within an axial hole of an insulator. A spark plug has an electrical connection part arranged in an axial hole of an insulator to establish electrical connection between a center electrode and a metal terminal. The electrical connection part includes a conductor having a first crystal phase formed of a Fe-containing oxide and a second crystal phase formed of a conductive metal oxide of perovskite crystal structure.
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公开(公告)号：US20170093134A1
公开(公告)日：2017-03-30
申请号：US15272807
申请日：2016-09-22
Applicant: NGK SPARK PLUG CO., LTD.
Inventor： Yutaka YOKOYAMA , Kuniharu TANAKA , Katsuya TAKAOKA , Shun KONDO , Nobuyoshi ARAKI , Toshiki KON , Haruki YOSHIDA , Jumpei ISASA , Hirokazu KURONO , Hironori UEGAKI , Toshimasa SAJI , Yusuke NOMURA
IPC: H01T13/38
Abstract: A spark plug including an insulator containing not less than 92 mass % and not greater than 96 mass % of Al component in terms of oxide, wherein the insulator is formed from an alumina sintered body comprising alumina crystal and a grain boundary phase present between crystal grains of the alumina crystal. Assuming that mass contents of an Si component, an Mg component, a Ba component, and a Ca component in terms of oxide are represented by MSiO2, MMgO, MBaO, and MCaO, respectively, and a sum of MSiO2, MMgO, MBaO, and MCaO is represented by Mt, the grain boundary phase contains these components so as to satisfy conditions (1) to (4) as follows: (1) 0.17≦MSiO2/Mt≦0.47; (2) 0.005≦MMgO/Mt≦0.07; (3) 0.29≦MBaO/Mt≦0.77; (4) 0.03≦MCaO/Mt≦0.19.
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公开(公告)号：US20150325982A1
公开(公告)日：2015-11-12
申请号：US14707344
申请日：2015-05-08
Applicant: NGK SPARK PLUG CO., LTD.
Inventor： Katsuya TAKAOKA , Kazuhiro KUROSAWA , Kuniharu TANAKA , Haruki YOSHIDA , Hirokazu KURONO , Toshitaka HONDA
IPC: H01T13/04
Abstract: A spark plug having an insulator with a through hole formed therein in a direction of an axis, a center electrode disposed in a front side of the through hole, a metal terminal disposed in a rear side of the through hole, an electrical connection part arranged in the through hole to establish electrical connection between the center electrode and the metal terminal and a metal shell holding therein the insulator. The electrical connection part has a conductor including a conductive material and at least one kind of Fe-containing oxide material. The Fe-containing oxide material contains at least FeO. The conductor satisfies a relationship of 0.06≦S1/(S1+S2)≦0.46 where, in a cross section taken along the axis, S1 is an area occupied by the conductive material and S2 is an area occupied by the Fe-containing oxide material.
Abstract translation: 一种火花塞，具有绝缘体，其沿着轴方向形成有贯通孔，设置在所述通孔的前侧的中心电极，设置在所述通孔的后侧的金属端子，布置在所述通孔的后侧的电连接部 在通孔中建立中心电极和金属端子之间的电连接以及保持绝缘体的金属壳。 电连接部分具有包括导电材料和至少一种含Fe氧化物材料的导体。 含Fe氧化物材料至少含有FeO。 导体满足0.06＆nlE; S1 /（S1 + S2）＆nlE; 0.46的关系，其中在沿着轴线截取的横截面中，S1是由导电材料占据的面积，S2是由含Fe 氧化物。
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公开(公告)号：US20190067915A1
公开(公告)日：2019-02-28
申请号：US16106187
申请日：2018-08-21
Applicant: NGK SPARK PLUG CO., LTD.
Inventor： Kazuhiro KUROSAWA , Katsuya TAKAOKA , Kota YOKOYAMA , Kuniharu TANAKA , Hirokazu KURONO , Hironori UEGAKI
Abstract: A spark plug having a connection portion disposed in the axial hole and between a metal terminal and a center electrode. The connection portion includes: a magnetic substance formed from a Fe-containing oxide; a conductor helically disposed on an outer periphery of the magnetic substance and electrically connected to the metal terminal and the center electrode; and an intermediate member disposed between the magnetic substance and the conductor, and an inner peripheral surface of the insulator and having lower electrical conductivity than the conductor. The conductor includes a base and a conductive layer disposed on an outer periphery of the base and having higher electrical conductivity than the base, and the conductive layer has a thickness of larger than 0.1 μm and equal to or smaller than 25 μm.
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