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公开(公告)号：US10348061B2
公开(公告)日：2019-07-09
申请号：US16018949
申请日：2018-06-26
Applicant: NGK SPARK PLUG CO., LTD.
Inventor： Hideto Yamada , Haruki Yoshida , Kuniharu Tanaka , Michitaka Yamada , Yusuke Nomura
IPC: H01T13/38 , H01T13/60 , B82Y30/00 , C04B35/64 , C04B35/111 , C04B35/117 , C04B35/626
Abstract: The spark plug includes an insulator formed of an alumina-based sintered body, and the insulator contains Si, Ba, and a rare earth element. In an analysis of the insulator by using a scanning transmission electron microscope having an electron-probe diameter of 1 nm, Si and a rare earth element are detected at a crystal grain boundary having a thickness of 15 nm or less, a content of an alkaline earth metal is less than a detection limit at the crystal grain boundary, and a diffraction spot is present in an electron diffraction pattern of a portion where Ba is detected.
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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：US09373940B2
公开(公告)日：2016-06-21
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
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：US09281662B2
公开(公告)日：2016-03-08
申请号：US14723506
申请日：2015-05-28
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 including an insulator having an axial hole, a center electrode held at one end side and a terminal electrode held at the other end side of the axial hole, an electrical connection portion electrically connecting the center electrode and the terminal electrode inside the axial hole, wherein the electrical connection portion includes a conductor including a ceramic phase and a metal wire having a spiral structure portion, wherein the metal wire has a wire diameter of 0.1 mm or greater and 0.5 mm or smaller, and wherein the spiral structure portion of the metal wire is configured such that an outer diameter thereof is 1.0 mm or greater and 3 mm or smaller, a pitch thereof is 0.3 mm or greater and 1 mm or smaller, and a height thereof is 8 mm or greater and 30 mm or smaller.
Abstract translation: 一种火花塞，其包括具有轴孔的绝缘体，一端保持的中心电极和保持在所述轴孔的另一端侧的端子电极，在所述轴向孔内电连接所述中心电极和所述端子电极的电连接部 其特征在于，所述电连接部包括具有陶瓷相的导体和具有螺旋结构部的金属线，所述金属线的线径为0.1mm以上且0.5mm以下，其特征在于， 金属线的外径为1.0mm以上且3mm以下，间距为0.3mm以上且1mm以下，高度为8mm以上且30mm以下 。
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公开(公告)号：US09160144B2
公开(公告)日：2015-10-13
申请号：US14038925
申请日：2013-09-27
Applicant: NGK Spark Plug Co., Ltd.
Inventor： Haruki Yoshida , Toshitaka Honda
Abstract: A spark plug with both improved load life performance and improved radio-noise-preventing property, wherein the spark plug has a resistor containing a Ti component. The spark plug includes a circular columnar insulator having a through hole; a center electrode; a terminal shell; and a resistor provided in the through hole and between the terminal shell and the center electrode. The resistor contains glass, a Ti component, a Zr component, and a non-metallic electrically conductive material.
Abstract translation: 一种火花塞具有改善的负载寿命性能和改善的防辐射噪声特性，其中火花塞具有包含Ti组分的电阻器。 火花塞包括具有通孔的圆柱形绝缘体; 中心电极; 终端壳; 以及设置在通孔中以及端子壳与中心电极之间的电阻器。 电阻器包含玻璃，Ti组分，Zr组分和非金属导电材料。
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Patent Agency Ranking
公开(公告)号：US11146041B2
公开(公告)日：2021-10-12
申请号：US17275054
申请日：2020-06-23
Applicant: NGK SPARK PLUG CO., LTD.
Inventor： Hiroki Shimada , Haruki Yoshida , Naoya Harata
Abstract: An insulator for a spark plug including a first portion; a second portion located on the rear side of the first portion, an outer diameter F at a front end of the second portion being smaller than an outer diameter of the first portion; a third portion located on the front side of the first portion, an outer diameter D at a rear end of the third portion being smaller than the outer diameter of the first portion and the outer diameter F at the front end of the second portion; a first slope portion connecting the first portion and the second portion; and a second slope portion connecting the first portion and the third portion. A length A of the second slope portion and a length B of the first slope portion satisfy 2.0≤A/B≤3.9, and 0.50≤D/F≤0.88 is satisfied.
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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.
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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
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.
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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
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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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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