公开(公告)号：US12003078B2

公开(公告)日：2024-06-04

申请号：US17911859

申请日：2021-01-18

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Hiroki Shimada ,  Haruki Yoshida ,  Shota Takaenoki

IPC: H01T13/36 ,  H01T13/20

CPC classification number: H01T13/36 ,  H01T13/20

Abstract: A spark plug which includes an insulator having an axial hole extending along an axial line, a metallic shell disposed around the insulator, and a center electrode disposed in the axial hole to be located on the forward end side of the axial line is provided. The insulator has a step portion provided on the outer circumferential surface thereof and facing toward the forward end side. The metallic shell has a receiving surface provided on the inner circumferential surface thereof and facing toward the rear end side and with which the step portion is engaged via a packing. A portion of the step portion on the outer circumferential side is a first curved surface being convex toward the forward end side, and a portion of the step portion on the inner circumferential side of the first curved surface is a second curved surface being convex toward the rear end side.

公开(公告)号：US09755404B2

公开(公告)日：2017-09-05

申请号：US15265152

申请日：2016-09-14

Applicant: NGK Spark Plug Co., LTD.

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

IPC: H01T13/38

CPC classification number: H01T13/38

Abstract: A spark plug includes an insulator made of an alumina sintered body containing Al2O3 as a principal component and additional components including; an Si component, a Ba component, an Mg component, a Ca component, an Sr component, and a rare earth element component. When the additional components are expressed as oxides including RSiO2, RBaO, RMgO, RCaO, RSrO, and RRE2O3, contents (mass %) of the sub-component satisfy expressions (1) to (6) as follows: (1) 1.0≦RSiO2≦5.0; (2) 0.5≦RBaO≦5.0; (3) 0≦RMgO≦0.18; (4) 0≦RMgO/RBaO≦0.36; (5) 0.3≦(RMgO+RCaO+RSrO)≦1.8; and (6) 0≦RRE2O3≦0.1.

公开(公告)号：US09711951B2

公开(公告)日：2017-07-18

申请号：US15071728

申请日：2016-03-16

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Yoshitomo Iwasaki ,  Haruki Yoshida ,  Toshitaka Honda

IPC: H01T13/20 ,  H01T13/40 ,  H01T13/34 ,  H01T13/41 ,  H01T13/08 ,  H01T13/36

CPC classification number: H01T13/40 ,  H01T13/08 ,  H01T13/34 ,  H01T13/36 ,  H01T13/41

Abstract: A spark plug having a resistor disposed within a through hole of an insulator and between a center electrode and a metal terminal so as to be spaced apart from the center electrode in a direction of an axial line; and a conductive glass seal layer provided between the resistor and the center electrode and electrically connecting the resistor and the center electrode to each other, the conductive glass seal layer has a diameter of 3.9 mm or less, and a joined surface of the conductive glass seal layer and the resistor has a convex shape toward the center electrode side. A length α from a rear end to a front end of the joined surface and a maximum length β of the conductive glass seal layer in the direction of the axial line meets a relation of α/β≧0.4.

公开(公告)号：US09653888B2

公开(公告)日：2017-05-16

申请号：US15272807

申请日：2016-09-22

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Yutaka Yokoyama ,  Kuniharu Tanaka ,  Katsuya Takaoka ,  Shun Kondo ,  Nobuyoshi Araki ,  Toshiki Kon ,  Haruki Yoshida ,  Jumpei Isasa ,  Hirokazu Kurono ,  Hironori Uegaki ,  Toshimasa Saji ,  Yusuke Nomura

IPC: H01T13/38

CPC classification number: H01T13/38 ,  H01T13/60

Abstract: A spark plug including an insulator containing not less than 92 mass % and not greater than 96 mass % of Al component in terms of oxide, wherein the insulator is formed from an alumina sintered body comprising alumina crystal and a grain boundary phase present between crystal grains of the alumina crystal. Assuming that mass contents of an Si component, an Mg component, a Ba component, and a Ca component in terms of oxide are represented by MSiO2, MMgO, MBaO, and MCaO, respectively, and a sum of MSiO2, MMgO, MBaO, and MCaO is represented by Mt, the grain boundary phase contains these components so as to satisfy conditions (1) to (4) as follows: (1) 0.17≦MSiO2/Mt≦0.47; (2) 0.005≦MMgO/Mt≦0.07; (3) 0.29≦MBaO/Mt≦0.77; (4) 0.03≦MCaO/Mt≦0.19.

公开(公告)号：US09614354B2

公开(公告)日：2017-04-04

申请号：US14913772

申请日：2014-06-02

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Haruki Yoshida ,  Jumpei Kita ,  Yoshitomo Iwasaki ,  Toshitaka Honda

IPC: H01T13/04 ,  H01T13/20 ,  H01T13/41 ,  H01T13/05

CPC classification number: H01T13/41 ,  H01T13/05 ,  H01T13/20

Abstract: A resistor element of a spark plug containing ZrO2, wherein a target region is defined by a rectangular region where the size in the direction perpendicular to an axial line is 1800 μm and the size in the direction of the axial line is 2400 μm. In the case where the target region is divided into a plurality of square regions having lengths of 200 μm on a side, a transverse line-shaped region is defined by a region in a line shape that is constituted of nine square regions arranged in the direction perpendicular to the axial line. A first type region is defined by the square region where a proportion of an area of ZrO2 is 25% or more, and a second type region is defined by the square region where a proportion of an area of ZrO2 is less than 25%.

公开(公告)号：US09595814B2

公开(公告)日：2017-03-14

申请号：US15108115

申请日：2014-12-25

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Takashi Kasashima ,  Katsuya Takaoka ,  Kazuhiro Kurosawa ,  Kuniharu Tanaka ,  Toshitaka Honda ,  Hirokazu Kurono ,  Haruki Yoshida ,  Hironori Uegaki

IPC: 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 and being disposed on a leading end side or a rear end side of the resistor while being positioned away from the resistor. 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 and second members. 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，并且设置在所述绝缘体的前端侧或后端侧 电阻器，同时远离电阻器定位。 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且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。

公开(公告)号：US09570889B2

公开(公告)日：2017-02-14

申请号：US15204148

申请日：2016-07-07

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Kengo Fujimura ,  Haruki Yoshida

IPC: H01T13/20 ,  F02P11/00 ,  H01T13/05 ,  H01T13/08 ,  H01T13/58

CPC classification number: H01T13/20 ,  F02P11/00 ,  H01T13/05 ,  H01T13/08 ,  H01T13/34 ,  H01T13/58

Abstract: A spark plug with an insulator that includes: a first portion having a first inner diameter with a front end of a trunk portion of a metal terminal disposed therein; a second portion having a second inner diameter larger than the first inner diameter, and including a portion 1 mm or more forward of a rear end of the insulator; and a third portion disposed between the first portion and the second portion and having a third inner diameter larger than the first inner diameter and smaller than the second inner diameter. The trunk portion of the metal terminal includes: a front trunk portion and a rear trunk portion with a front end of the rear trunk portion positioned forward of a rear end of the third portion of the insulator, the rear trunk portion having an outer diameter larger than the outer diameter of the front trunk portion.

Abstract translation: 一种具有绝缘体的火花塞，包括：具有第一内径的第一部分，其中设置有金属端子的主体部分的前端; 第二部分具有比第一内径大的第二内径，并且包括绝缘体的后端的前方的1mm以上的部分; 以及设置在所述第一部分和所述第二部分之间并且具有大于所述第一内径并且小于所述第二内径的第三内径的第三部分。 金属端子的主体部分包括：前主体部分和后主体部分，其后部主体部分的前端位于绝缘体的第三部分的后端的前方，后部主体部分具有较大的外径 比前躯干部的外径大。

公开(公告)号：US09484718B2

公开(公告)日：2016-11-01

申请号：US14912753

申请日：2014-08-08

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Haruki Yoshida ,  Takamitsu Mizuno ,  Masaaki Kumagai ,  Jumpei Kita ,  Yoshitomo Iwasaki ,  Toshitaka Honda

IPC: H01T13/20 ,  H01T13/39 ,  H01T13/41

CPC classification number: H01T13/39 ,  H01T13/05 ,  H01T13/34 ,  H01T13/41

Abstract: A spark plug includes an insulator having an axial hole, a center electrode inserted into a forward portion of the axial hole, a terminal electrode inserted into a rear portion of the axial hole, and an interelectrode insert which contains glass and electrically conductive carbon and is disposed in the axial hole between the center electrode and the terminal electrode. The interelectrode insert has a resistance of 1.0 kΩ to 3.0 kΩ, and the interelectrode insert has a carbon content of 1.5% by mass to 4.0% by mass at a forward portion located forward of a center point between the rear end of the center electrode and the forward end of the terminal electrode. Furthermore, the forward portion is lower in resistance than a rear portion of the interelectrode insert located rearward of the center point.

Abstract translation: 火花塞包括具有轴向孔的绝缘体，插入到轴向孔的前部的中心电极，插入到轴向孔的后部的端子电极和包含玻璃和导电性碳的电极间插入件 设置在中心电极和端子电极之间的轴向孔中。 电极间插入件具有1.0kΩ至3.0kΩ的电阻，并且电极间插入件在位于中心电极的后端和中间电极的后端之间的中间点的前部处的碳含量为1.5质量％至4.0质量％ 端子电极的前端。 此外，前部的电阻低于位于中心点后方的电极间插入件的后部。

公开(公告)号：US09312664B2

公开(公告)日：2016-04-12

申请号：US14419590

申请日：2013-03-20

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Haruki Yoshida ,  Takamitsu Mizuno ,  Satoshi Yano

IPC: H01T13/20 ,  H01T13/40 ,  H01T13/41

CPC classification number: H01T13/20 ,  H01T13/40 ,  H01T13/41

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。