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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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12.发明授权公开(公告)号：US10305260B2
公开(公告)日：2019-05-28
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
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.
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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：US10014665B2
公开(公告)日：2018-07-03
申请号：US14856777
申请日：2015-09-17
Applicant: NGK SPARK PLUG CO., LTD.
Inventor： Jumpei Kita , Haruki Yoshida
Abstract: A spark plug having an insulator that includes a first portion which accommodates a front end of the metallic terminal. A portion of the metallic terminal has a roughened surface portion with a Vickers hardness of 200 Hv or greater and 320 Hv or smaller. A first ratio of an outside diameter of the roughened surface corresponding to at least a part of the first portion of the insulator to the first bore diameter of the insulator is 0.90 or greater. A second ratio of the first bore diameter to the second bore diameter of the insulator is 0.80 or greater and 0.98 or smaller.
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公开(公告)号：US09035541B2
公开(公告)日：2015-05-19
申请号：US14388092
申请日：2013-01-11
Applicant: NGK Spark Plug Co., Ltd.
Inventor： Haruki Yoshida , Takamitsu Mizuno
Abstract: A spark plug includes an insulator having an axial hole, a metal terminal member having an insert portion and a depression formation zone existing on the insert portion and having depressions, and a metallic shell. The spark plug satisfies the following conditions: (1) the insert portion has a length H of 35 mm or more; (2) the depression formation zone has a length F of 13 mm or more; (3) the insert portion has a smooth surface zone on its outer circumferential surface; (4) the ratio (A/B) between diameter A of a forward end of the insert portion and inside diameter B of the insulator measured at the forward end satisfies the relational expression 0.9≦A/B≦0.98; and (5) Vickers hardness of the insert portion measured at the center of a cross section of the insert portion is 150 Hv or more to 350 Hv or less.
Abstract translation: 火花塞包括具有轴向孔的绝缘体，具有插入部分的金属端子构件和存在于插入部分上并具有凹陷的凹陷形成区和金属壳。 火花塞满足以下条件：（1）插入部的长度H为35mm以上; （2）凹陷形成区域的长度F为13mm以上; （3）插入部在其外周面具有平滑的表面区域; （4）插入部前端的直径A与前端部测定的绝缘体的内径B之间的比（A / B）满足关系式0.9＆nlE; A / B＆nlE; 0.98; 和（5）在插入部分的横截面的中心测量的插入部分的维氏硬度为150Hv或更高至350Hv或更低。
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Patent Agency Ranking
公开(公告)号：US08987980B1
公开(公告)日：2015-03-24
申请号：US14478651
申请日：2014-09-05
Applicant: NGK Spark Plug Co., Ltd.
Inventor： Jumpei Kita , Haruki Yoshida , Takamitsu Mizuno
Abstract: A spark plug includes an insulator, a terminal electrode, a center electrode, a resistor, and a glass seal layer. The terminal electrode has: a recess part opened to the front end side and having a depth in a center axis direction of the terminal electrode; and a flat part neighboring the recess part at its outer circumference side. The relationship 0.52≦B/A≦0.91 is satisfied, wherein A (mm2) represents an area of a region surrounded by an outline of an outer circumference surface of the terminal electrode, and B (mm2) which represents an area of a region of the terminal electrode surrounded by an outline of an inner surface of the recess part, in a cross section orthogonal to the center axis and located 0.1 mm away from a front end along the center axis to the rear end side.
Abstract translation: 火花塞包括绝缘体，端子电极，中心电极，电阻器和玻璃密封层。 端子电极具有：开口到前端侧并具有端子电极的中心轴方向的深度的凹部; 以及在其外周侧与凹部相邻的平坦部。 满足0.52＆nlE; B / A＆nlE; 0.91的关系，其中A（mm2）表示由端子电极的外周面的轮廓包围的区域的面积，B（mm2）表示区域的面积 在垂直于中心轴线的截面中沿着中心轴线至后端侧位于距离前端0.1mm的位置上，由凹部的内表面的轮廓包围的端子电极。
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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
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.
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公开(公告)号：US20150214697A1
公开(公告)日：2015-07-30
申请号：US14419590
申请日：2013-03-20
Applicant: NGK SPARK PLUG CO., LTD.
Inventor： Haruki Yoshida , Takamitsu Mizuno , Satoshi Yano
Abstract: A spark plug having a resistor containing SiO2 and B2O3. The glass is a phase-separated glass having aggregate phase and an intervening phase. In a cross section of the resistor, when a plurality of imaginary lines perpendicular to an axial line CL1 are drawn at intervals of 0.1 mm in the direction of the axial line CL1, the number of aggregate phase located on each of the imaginary lines is determined, and the average number of aggregate phase per imaginary line is determined for each of a plurality of line groups each comprised of five consecutive imaginary lines, there are three or more consecutive line groups which satisfy the condition that the average number of aggregate phase per imaginary line is larger, by 5 or more, than the minimum average number of aggregate phase per imaginary line among the plurality of line groups.
Abstract translation: 具有含有SiO 2和B 2 O 3的电阻器的火花塞。 玻璃是具有聚集相和中间相的相分离玻璃。 在电阻器的横截面中，当沿轴线CL1的方向以0.1mm的间隔绘制垂直于轴线CL1的多个假想线时，确定位于每个假想线上的聚集相位的数量 ，并且对于由五个连续虚线组成的多个线组中的每个线群，确定每个虚线的平均聚合相数，具有三个或更多个连续的线组，其满足以下条件：每个虚构的聚集相的平均数 线比多个线组中每个假想线的聚集相的最小平均数大5倍以上。
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公开(公告)号：US20150061485A1
公开(公告)日：2015-03-05
申请号：US14388092
申请日：2013-01-11
Applicant: NGK Spark Plug Co., Ltd.
Inventor： Haruki Yoshida , Takamitsu Mizuno
Abstract: A spark plug includes an insulator having an axial hole, a metal terminal member having an insert portion and a depression formation zone existing on the insert portion and having depressions, and a metallic shell. The spark plug satisfies the following conditions: (1) the insert portion has a length H of 35 mm or more; (2) the depression formation zone has a length F of 13 mm or more; (3) the insert portion has a smooth surface zone on its outer circumferential surface; (4) the ratio (A/B) between diameter A of a forward end of the insert portion and inside diameter B of the insulator measured at the forward end satisfies the relational expression 0.9≦A/B≦0.98; and (5) Vickers hardness of the insert portion measured at the center of a cross section of the insert portion is 150 Hv or more to 350 Hv or less.
Abstract translation: 火花塞包括具有轴向孔的绝缘体，具有插入部分的金属端子构件和存在于插入部分上并具有凹陷的凹陷形成区和金属壳。 火花塞满足以下条件：（1）插入部的长度H为35mm以上; （2）凹陷形成区域的长度F为13mm以上; （3）插入部在其外周面具有平滑的表面区域; （4）插入部前端的直径A与前端部测定的绝缘体的内径B之间的比（A / B）满足关系式0.9＆nlE; A / B＆nlE; 0.98; 和（5）在插入部分的横截面的中心测量的插入部分的维氏硬度为150Hv或更高至350Hv或更低。
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公开(公告)号：US20140091700A1
公开(公告)日：2014-04-03
申请号：US14038925
申请日：2013-09-27
Applicant: NGK Spark Plug Co., Ltd.
Inventor： Haruki Yoshida , Toshitaka Honda
IPC: H01T13/02
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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