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公开(公告)号：US10205305B2
公开(公告)日：2019-02-12
申请号：US15738510
申请日：2016-05-24
Applicant: NGK SPARK PLUG CO., LTD.
Inventor： Hironori Uegaki , Hirokazu Kurono , Jumpei Kita
Abstract: A spark plug including a metal shell having a ground electrode, a cylindrical ceramic insulator held in the metal shell and having therein an axial hole having a small-diameter portion, and a large-diameter portion larger in diameter than the small-diameter portion and connected to a rear end of the small-diameter portion via a stepped portion, a resistor arranged in the large-diameter portion, a center electrode having: a flange portion projecting in a radial direction in the large-diameter portion to contact with the stepped portion; and a leg portion arranged in the small-diameter portion so as to extend from the flange portion toward the front end side, and a seal body arranged in the large-diameter portion and electrically connecting between the center electrode and the resistor. The seal body includes an insulating seal body that comes into contact with the ceramic insulator, and a conductive seal body.
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公开(公告)号：US10153619B2
公开(公告)日：2018-12-11
申请号：US15736492
申请日：2016-06-02
Applicant: NGK SPARK PLUG CO., LTD.
Inventor： Hironori Uegaki , Haruki Yoshida , Hirokazu Kurono
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.
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公开(公告)号：US20170326765A1
公开(公告)日：2017-11-16
申请号：US15534529
申请日：2015-09-23
Applicant: NGK Spark Plug Co., Ltd.
Inventor： Hirokazu Kurono , Hironori Uegaki , Toshitaka Honda , Hiroyuki Hazama , Kuniharu Tanaka , Hiroyuki Kawaji
CPC classification number: B29C45/14655 , B28B1/24 , B28B7/0038 , B28B7/18 , B28B7/346 , B28B13/06 , H01T13/20 , H01T13/34 , H01T13/39 , H01T21/02
Abstract: An employed rear mold is comprised of a plurality of mold pieces. The plurality of mold pieces include a first mold piece which forms a first partial internal surface of the internal surface of the rear mold along the entire circumference of the internal surface, and a second mold piece which is located axially forward of the first mold piece and forms a second partial internal surface of the internal surface of the rear mold along the entire circumference of the internal surface. Releasing the molded body includes starting to move the first mold piece rearward in relation to a rear molded portion, and, subsequently to starting to move the first mold piece, starting to move the second mold piece rearward in relation to the rear molded portion, thereby disassembling the rear mold into the plurality of mold pieces.
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公开(公告)号：US11183819B2
公开(公告)日：2021-11-23
申请号：US16574170
申请日：2019-09-18
Applicant: NGK SPARK PLUG CO., LTD.
Inventor： Yutaka Yokoyama , Nobuyoshi Araki , Kuniharu Tanaka , Haruki Yoshida , Hironori Uegaki , Toshiki Kon , Yusuke Nomura
IPC: H01T13/38 , H01B3/12 , C04B35/111
Abstract: A spark plug according to one embodiment of the present invention includes an insulator formed of an alumina-based sintered body, wherein the insulator contains 90 wt % or more of an aluminum component in terms of oxide, and wherein crystal grains of the insulator has an average grain size of 1.5 mm or smaller and a grain size standard deviation of 1.2 μm or smaller.
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公开(公告)号：US10751923B2
公开(公告)日：2020-08-25
申请号：US15534529
申请日：2015-09-23
Applicant: NGK Spark Plug Co., Ltd.
Inventor： Hirokazu Kurono , Hironori Uegaki , Toshitaka Honda , Hiroyuki Hazama , Kuniharu Tanaka , Hiroyuki Kawaji
IPC: B29C45/14 , H01T21/02 , H01T13/20 , B28B7/34 , B28B13/06 , B28B7/18 , B28B7/00 , B28B1/24 , H01T13/34 , H01T13/39
Abstract: An employed rear mold is comprised of a plurality of mold pieces. The plurality of mold pieces include a first mold piece which forms a first partial internal surface of the internal surface of the rear mold along the entire circumference of the internal surface, and a second mold piece which is located axially forward of the first mold piece and forms a second partial internal surface of the internal surface of the rear mold along the entire circumference of the internal surface. Releasing the molded body includes starting to move the first mold piece rearward in relation to a rear molded portion, and, subsequently to starting to move the first mold piece, starting to move the second mold piece rearward in relation to the rear molded portion, thereby disassembling the rear mold into the plurality of mold pieces.
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Patent Agency Ranking
公开(公告)号：US10340667B2
公开(公告)日：2019-07-02
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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公开(公告)号：US10090646B2
公开(公告)日：2018-10-02
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：US09843167B2
公开(公告)日：2017-12-12
申请号：US15291601
申请日：2016-10-12
Applicant: NGK Spark Plug Co., LTD.
Inventor： Hironori Uegaki , Yoshitomo Iwasaki
Abstract: An electrically-conductive seal portion of a spark plug includes a large-diameter seal portion, a small-diameter seal portion having an outer diameter smaller than an outer diameter of the large-diameter seal portion, and a tapered seal portion disposed between the large-diameter seal portion and the small-diameter seal portion. An insulator includes a flange portion, a first middle-body portion having an outer diameter smaller than an outer diameter of the flange portion, a second middle-body portion having an outer diameter smaller than an outer diameter of the first middle-body portion, and a leg portion having an outer diameter that tapers toward a tip end of the spark plug. The tapered seal portion is disposed inside the first middle-body portion.
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公开(公告)号：US10277012B2
公开(公告)日：2019-04-30
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
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：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
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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