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    Spark plug
    1.
    发明授权
    Spark plug 有权

    公开(公告)号：US10424901B2

    公开(公告)日：2019-09-24

    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

    IPC: H01T13/32 ,  H01T13/20 ,  H01T13/06

    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.

    Spark plug
    3.
    发明授权
    Spark plug 有权

    公开(公告)号：US10270228B2

    公开(公告)日：2019-04-23

    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

    IPC: H01T13/41 ,  H01T13/34 ,  C22C19/03 ,  H01T13/05

    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.

    Gas sensor element and gas sensor
    5.
    发明授权
    Gas sensor element and gas sensor 有权
    气体传感器元件和气体传感器

    公开(公告)号：US09080964B2

    公开(公告)日：2015-07-14

    申请号：US13665731

    申请日：2012-10-31

    Applicant: NGK SPARK PLUG CO., LTD.

    Inventor： Sigehiro Otsuka ,  Masaki Onkawa ,  Toru Iwano ,  Satoshi Teramoto ,  Kuniharu Tanaka ,  Takeshi Mitsuoka

    IPC: G01N27/407 ,  G01N33/00

    CPC classification number: G01N27/4077 ,  G01N33/0014 ,  G01N33/0037 ,  Y02A50/245

    Abstract: A gas sensor element (100) includes a laminate of a detection element (300) and a heater (200), and a porous protection layer (20) covering a forward end portion thereof. The laminate has a measuring chamber (107c) into which a gas-to-be-measured is introduced via a diffusion resistor (115). The porous protection layer includes an inner porous layer (21), and an outer porous layer (23). The inner porous layer has a higher porosity than the outer porous layer and the diffusion resistor. As viewed in a plurality of 100 μm×100 μm regions a1 to a3 and b1 to b3 on sections of the inner porous layer and the diffusion resistor, respectively, a pore diameter greater than the greatest pore diameter CDIF in the regions of the diffusion resistor exists in each of the regions of the inner porous layer.

    Abstract translation: 气体传感器元件（100）包括检测元件（300）和加热器（200）的层叠体，以及覆盖其前端部的多孔保护层（20）。 层压体具有经由扩散电阻器（115）引入待测气体的测量室（107c）。 多孔保护层包括内多孔层（21）和外多孔层（23）。 内部多孔层具有比外部多孔层和扩散电阻器更高的孔隙率。 从内部多孔层和扩散电阻的各部分的多个100μm×100μm的区域a1〜a3，b1〜b3分别观察到，扩散电阻区域的孔径大于最大孔径CDIF 存在于内部多孔层的每个区域中。

    Spark plug
    6.
    发明授权
    Spark plug 有权

    公开(公告)号：US10586627B2

    公开(公告)日：2020-03-10

    申请号：US16015967

    申请日：2018-06-22

    Applicant: NGK SPARK PLUG CO., LTD.

    Inventor： Haruki Yoshida ,  Kuniharu Tanaka ,  Shun Kondo ,  Yutaka Yokoyama ,  Yusuke Nomura ,  Michitaka Yamada

    IPC: H01B3/12 ,  C04B35/117 ,  H01T13/38 ,  H01T13/60 ,  C04B35/111

    Abstract: The spark plug includes an insulator made from an alumina-based sintered body, and the insulator contains 90 to 98 wt % of an Al component in oxide equivalent. The insulator contains 1 to 5 wt % of an Si component, 0.1 to 1 wt % of an Mg component, 2 wt % or less of a Ca component, 0.3 to 6 wt % of a Ba component, and 0.11 to 5 wt % of a rare earth component, in oxide equivalent. In analysis using a scanning transmission electron microscope with a probe diameter of an electron beam set at 1 nm, Si and a rare earth element are detected at a crystal grain boundary having a thickness of 15 nm or less, and an alkaline earth metal at the crystal grain boundary is less than a detection limit.

    Spark plug having the thickness of a magnetic member without excessively narrowing an electrode member
    7.
    发明授权
    Spark plug having the thickness of a magnetic member without excessively narrowing an electrode member 有权

    公开(公告)号：US10153622B1

    公开(公告)日：2018-12-11

    申请号：US16001451

    申请日：2018-06-06

    Applicant: NGK SPARK PLUG CO., LTD.

    Inventor： Hironori Uegaki ,  Shoma Tsumagari ,  Kazuhiro Kurosawa ,  Katsuya Takaoka ,  Kuniharu Tanaka

    IPC: H01T13/34 ,  H01T13/41

    CPC classification number: H01T13/41 ,  H01T13/34

    Abstract: A spark plug has an insulator, a rod-shaped electrode member disposed in an axial hole of the insulator, and a cylindrical magnetic member disposed on an outer circumference of the electrode member within the axial hole. The insulator includes a large inner diameter region, a middle inner diameter region located frontward of the large inner diameter region and having an inner diameter smaller than that of the large inner diameter region, and a small inner diameter region located frontward of the middle inner diameter region and having an inner diameter smaller than that of the middle inner diameter region. The electrode member is retained on a step portion of the insulator between the middle inner diameter region and the small inner diameter region. The magnetic member is positioned in the axial hole at a location within the large inner diameter region.

    Spark plug
    8.
    发明授权
    Spark plug 有权

    公开(公告)号：US09912125B2

    公开(公告)日：2018-03-06

    申请号：US15272561

    申请日：2016-09-22

    Applicant: NGK SPARK PLUG CO., LTD.

    Inventor： Haruki Yoshida ,  Jumpei Isasa ,  Toshitaka Honda ,  Yutaka Yokoyama ,  Kuniharu Tanaka ,  Nobuyoshi Araki ,  Toshiki Kon

    IPC: H01T13/38 ,  H01T13/18 ,  H01T13/60 ,  H01T21/02

    CPC classification number: H01T13/38 ,  H01T13/18 ,  H01T13/60 ,  H01T21/02

    Abstract: A spark plug includes an insulator, a center electrode, a metallic shell, and a ground electrode. The insulator contains not less than 90.0 mass % and not greater than 98.1 mass % of Al2O3 with respect to a total mass of elements, as reduced to oxides, contained in the insulator, and has a porosity not greater than 5%. Assuming that a porosity of the insulator after a heat treatment is B, a difference (B−A) of the porosities before and after the heat treatment is not greater than 3.5%. In the heat treatment, the insulator is placed in a furnace, and a temperature in the furnace is increased from a room temperature to 1400° C. at a temperature increase rate of 7° C./min and is held at 1400° C. for 30 minutes, and thereafter, the temperature is decreased from 1400° C. to 400° C. at a temperature decrease rate of 10° C. or less per 5 minutes and is decreased to the room temperature.

    Spark plug
    9.
    发明授权
    Spark plug 有权
    火花塞

    公开(公告)号：US09590395B2

    公开(公告)日：2017-03-07

    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

    IPC: C04B35/195 ,  H01T13/05 ,  H01T13/41 ,  F02P11/00

    CPC classification number: H01T13/05 ,  F02P11/00 ,  H01T13/41

    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: 在绝缘体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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