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.

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

IPC: H01T13/05 ,  C01G49/02 ,  C01G51/04 ,  C01G53/04 ,  C01G53/00

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.

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.

公开(公告)号：US10084288B2

公开(公告)日：2018-09-25

申请号：US15738650

申请日：2016-06-02

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Hironori Uegaki ,  Seiji Nakano ,  Hirokazu Kurono

IPC: H01T13/34 ,  H01T13/41 ,  H01T13/32

Abstract: A spark plug including a metallic shell having a ground electrode, an insulator held inside the metallic shell and having an axial hole having a small diameter portion, an intermediate diameter portion connected to a rear end of the small diameter portion via a step portion, and a large diameter portion disposed on the rear side of the intermediate diameter portion, a resistor disposed inside the large diameter portion, a center electrode having a flange portion which bulges in a radial direction inside the intermediate diameter portion and comes into contact with the step portion and a leg portion which extends forward from the flange portion and is disposed inside the small diameter portion, and a seal disposed on the rear side of the step portion and electrically connecting the center electrode and the resistor. The rear end of the seal is located inside the intermediate diameter portion.

公开(公告)号：US09362722B2

公开(公告)日：2016-06-07

申请号：US14377306

申请日：2012-11-29

Applicant: NGK Spark Plug Co., LTD.

Inventor： Katsuya Takaoka ,  Hirokazu Kurono ,  Toshitaka Honda ,  Syuuichiro Wakizoe ,  Mitsushiro Kondo

IPC: H01T13/20 ,  H01T13/38 ,  C04B35/117 ,  C04B35/626 ,  B82Y30/00 ,  F02P13/00

CPC classification number: H01T13/38 ,  B82Y30/00 ,  C04B35/117 ,  C04B35/62655 ,  C04B35/62695 ,  C04B2235/3206 ,  C04B2235/3208 ,  C04B2235/3213 ,  C04B2235/3215 ,  C04B2235/3217 ,  C04B2235/3224 ,  C04B2235/3225 ,  C04B2235/3227 ,  C04B2235/3418 ,  C04B2235/781 ,  C04B2235/785 ,  C04B2235/786 ,  C04B2235/788 ,  C04B2235/80 ,  F02P13/00

Abstract: A spark plug exhibiting excellent withstand voltage characteristics and mechanical strength at high temperature, which are comparable to those at ambient temperature. The spark plug having an insulator formed of an alumina-based sintered material containing: an Al component, an Si component, a Group 2 element component, and a rare earth element component. The amounts of such components satisfy a condition (1): 0.25≦oxide-reduced amount (mass %) of the Si component ≦1.25, and a condition (2): 1.35≦[(oxide-reduced amount of the Si component)/((oxide-reduced amount of the Group 2 element component)/(oxide-reduced amount of the rare earth element component))]≦7.5. The alumina-based sintered material includes alumina grains, and a glass phase including a crystal phase that satisfies a condition (3) that the crystal phase includes at least one of an aluminate crystal phase and a silicate crystal phase, each having a grain size of 20 to 350 nm.

Abstract translation: 具有优异耐高压特性和高温机械强度的火花塞，与环境温度相当。 所述火花塞具有绝缘体，所述绝缘体由包含Al组分，Si组分，第2族元素组分和稀土元素组分的氧化铝基烧结材料形成。 这些成分的量满足条件（1）：0.25＆nlE; Si成分的氧化物还原量（质量％）＆lt; 1.25，条件（2）：1.35＆nlE; [（Si的氧化物还原量 成分）/（（第2族元素成分的氧化物还原量）/（稀土元素成分的氧化物还原量））＆lt; 7.5。 所述氧化铝系烧结体包含氧化铝粒子，以及含有结晶相的玻璃相，所述结晶相满足条件（3），所述结晶相包含铝酸盐结晶相和硅酸盐结晶相中的至少一种， 20〜350nm。

公开(公告)号：US20150288150A1

公开(公告)日：2015-10-08

申请号：US14441315

申请日：2013-06-13

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Katsuya Takaoka ,  Hironori Uegaki ,  Hirokazu Kurono ,  Toshitaka Honda

IPC: H01T13/38

CPC classification number: H01T13/38 ,  C04B35/111 ,  C04B2235/3206 ,  C04B2235/3208 ,  C04B2235/3213 ,  C04B2235/3215 ,  C04B2235/3222 ,  C04B2235/3224 ,  C04B2235/3225 ,  C04B2235/3227 ,  C04B2235/3418 ,  C04B2235/3463 ,  C04B2235/786 ,  C04B2235/80 ,  C04B2235/85 ,  C04B2235/96 ,  H01B3/12 ,  H01B7/2806

Abstract: A spark plug having an insulator formed of an alumina-based sintered material which contains an Si component and a rare earth element component that satisfy the following conditions (1) and (2): (1) an oxide-reduced amount of the Si component (mass %) is greater than or equal to 0.05 and less than or equal to 0.45; and (2) a ratio of an oxide-reduced amount of the rare earth element component to an oxide-reduced amount of the Si component is greater than or equal to 2.5 and less than or equal to 4.5, and which has alumina grains and an alumina grain boundary phase including a complex oxide crystal phase satisfying the following condition (3): (3) the complex oxide crystal phase contains at least two components selected from among an Al component, an Si component, a Group 2 element component, and a rare earth element component.

Abstract translation: 一种火花塞，其具有由含有Si成分和满足以下条件（1）和（2））的Si成分和稀土元素成分的氧化铝类烧结体形成的绝缘体：（1）氧化物还原量的Si成分 （质量％）大于或等于0.05且小于或等于0.45; 和（2）稀土元素成分的氧化物还原量与Si成分的氧化物还原量的比例大于或等于2.5且小于或等于4.5，并且具有氧化铝颗粒和 氧化铝晶界相包含满足以下条件（3）的复合氧化物晶相：（3）复合氧化物晶相含有选自Al成分，Si成分，2族元素成分和 稀土元素成分。

公开(公告)号：US20150207300A1

公开(公告)日：2015-07-23

申请号：US14420819

申请日：2013-08-23

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Hiroki Takeuchi ,  Yutaka Yokoyama ,  Kuniharu Tanaka ,  Takeshi Mitsuoka ,  Toshitaka Honda ,  Hirokazu Kurono ,  Katsuya Takaoka ,  Hironori Uegaki

IPC: H01T13/38 ,  C04B35/10

CPC classification number: H01T13/38 ,  C04B35/10 ,  C04B35/111 ,  C04B2235/3201 ,  C04B2235/3206 ,  C04B2235/3208 ,  C04B2235/3213 ,  C04B2235/3215 ,  C04B2235/3222 ,  C04B2235/3224 ,  C04B2235/3225 ,  C04B2235/3227 ,  C04B2235/3232 ,  C04B2235/3418 ,  C04B2235/3481 ,  C04B2235/80 ,  C04B2235/85 ,  G01R31/12 ,  G01R31/14 ,  H01T13/60

Abstract: A spark plug including an insulator containing an Al component, in terms of oxides, 89 mass % or more and a Ti component, in terms of oxides, more than 0 mass % and 0.2 mass % or less, characterized in that the insulator is formed of an alumina-based sintered material which contains, in a grain boundary phase present between alumina crystal grains, a first crystal phase containing at least one species selected from among an La component, an Nd component, a Pr component, a Y component, an Er component, a Yb component, and an Lu component, and a second crystal phase containing at least one species of Group 2 element components, an Al component and an Si component.

Abstract translation: 一种火花塞，其包括以氧化物计，89质量％以上的Al成分和Ti成分以氧化物计，大于等于0质量％和0.2质量％以下的绝缘体，其特征在于，形成所述绝缘体 的氧化铝系烧结体，其在存在于氧化铝晶粒之间的晶界相中含有含有选自La成分，Nd成分，Pr成分，Y成分， 铒组分，Yb组分和Lu组分，以及含有至少一种2族元素组分，Al组分和Si组分的第二晶相。

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.

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

IPC: 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.

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

IPC: H01T13/05 ,  H01T13/41 ,  H01T21/02

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.