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    SPARK PLUG
    11.
    发明申请
    SPARK PLUG 审中-公开

    公开(公告)号：US20170353013A1

    公开(公告)日：2017-12-07

    申请号：US15607714

    申请日：2017-05-30

    Applicant: NGK SPARK PLUG CO., LTD.

    Inventor： Haruki YOSHIDA ,  Kuniharu TANAKA ,  Yutaka YOKOYAMA ,  Shun KONDO ,  Hirokazu KURONO ,  Toshimasa SAJI

    IPC: H01T13/20 ,  H01T13/39 ,  H01T13/06

    Abstract: A spark plug having an insulator with a leg portion whose outer circumferential surface has an arithmetic mean roughness Ra of 0.5 μm or less. The leg portion has a first section, a second section, and a third section. The first section has an outer diameter that decreases toward the forward end of the first section. The second section is located forward of and adjacent to the first section and its outer diameter decreases toward the forward end of the second section. The outer circumferential surface of the second section is located inward of a first straight line passing through the base and forward ends of the outer circumferential surface of the first section. The third section is located forward of and adjacent to the second section. The outer diameter of the third section is equal to or less than a forward end outer diameter Ds of the second section over the entire third section.

    SPARK PLUG
    12.
    发明申请
    SPARK PLUG 审中-公开

    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

    IPC: H01T13/41 ,  H01T21/02 ,  H01T13/34

    CPC classification number: H01T13/41 ,  H01T13/34 ,  H01T21/02

    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.

    SPARK PLUG
    15.
    发明申请
    SPARK PLUG 有权
    SPARK插头

    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

    CPC classification number: H01T13/04 ,  H01T13/05 ,  H01T13/41

    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。

    SPARK PLUG
    16.
    发明申请
    SPARK PLUG 有权

    公开(公告)号：US20230008031A1

    公开(公告)日：2023-01-12

    申请号：US17911859

    申请日：2021-01-18

    Applicant: NGK SPARK PLUG CO., LTD.

    Inventor： Hiroki SHIMADA ,  Haruki YOSHIDA ,  Shota TAKAENOKI

    IPC: H01T13/36 ,  H01T13/20

    Abstract: A spark plug which includes an insulator having an axial hole extending along an axial line, a metallic shell disposed around the insulator, and a center electrode disposed in the axial hole to be located on the forward end side of the axial line is provided. The insulator has a step portion provided on the outer circumferential surface thereof and facing toward the forward end side. The metallic shell has a receiving surface provided on the inner circumferential surface thereof and facing toward the rear end side and with which the step portion is engaged via a packing. A portion of the step portion on the outer circumferential side is a first curved surface being convex toward the forward end side, and a portion of the step portion on the inner circumferential side of the first curved surface is a second curved surface which being convex toward the rear end side.

    SPARK PLUG
    17.
    发明申请
    SPARK PLUG 审中-公开

    公开(公告)号：US20190020181A1

    公开(公告)日：2019-01-17

    申请号：US16033661

    申请日：2018-07-12

    Applicant: NGK SPARK PLUG CO., LTD.

    Inventor： Haruki YOSHIDA ,  Kuniharu TANAKA ,  Toshinori TAKEICHI ,  Michitaka YAMADA ,  Yusuke NOMURA

    IPC: H01T13/34 ,  H01T13/52

    Abstract: Disclosed is a spark plug including: an insulator having an axial hole formed along an axis of the spark plug; a center electrode disposed in a front end side of the axial hole; and a metal shell fixed around an outer circumference of the insulator, with a front end portion of the insulator protruding frontward from a front end of the metal shell. The front end portion of the insulator consists only of a first section and a second section located adjacent to and frontward of the first section and having an inner diameter larger than that of the first section. The second section has a chamfered area formed on an inner circumferential surface thereof so as to continue to a front end of the insulator.

    SPARK PLUG
    19.
    发明申请
    SPARK PLUG 审中-公开

    公开(公告)号：US20180191138A1

    公开(公告)日：2018-07-05

    申请号：US15736492

    申请日：2016-06-02

    Applicant: NGK SPARK PLUG CO., LTD.

    Inventor： Hironori UEGAKI ,  Haruki YOSHIDA ,  Hirokazu KURONO

    IPC: H01T13/34

    CPC classification number: H01T13/34 ,  H01T13/05 ,  H01T13/20

    Abstract: A spark plug having a center electrode that is formed by joining a conductive portion made of a conductive material and an insulating portion made of an insulating material. A sealing member electrically connects the conductive portion to a resistor. The insulating portion includes a protruding portion at a location on the back side of a back end of the sealing member. The protruding portion is embedded in the resistor.

    SPARK PLUG
    20.
    发明申请
    SPARK PLUG 有权

    公开(公告)号：US20170093132A1

    公开(公告)日：2017-03-30

    申请号：US15265152

    申请日：2016-09-14

    Applicant: NGK Spark Plug Co., LTD.

    Inventor： Jumpei ISASA ,  Haruki YOSHIDA ,  Yutaka YOKOYAMA ,  Kuniharu TANAKA ,  Nobuyoshi ARAKI ,  Toshiki KON

    IPC: H01T13/38

    CPC classification number: H01T13/38

    Abstract: A spark plug includes an insulator made of an alumina sintered body containing Al2O3 as a principal component and additional components including; an Si component, a Ba component, an Mg component, a Ca component, an Sr component, and a rare earth element component. When the additional components are expressed as oxides including RSiO2, RBaO, RMgO, RCaO, RSrO, and RRE2O3, contents (mass %) of the sub-component satisfy expressions (1) to (6) as follows: (1) 1.0≦RSiO2≦5.0; (2) 0.5≦RBaO≦5.0; (3) 0≦RMgO≦0.18; (4) 0≦RMgO/RBaO≦0.36; (5) 0.3≦(RMgO+RCaO+RSiO)≦1.8; and (6) 0≦RRE2O3≦0.1.

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