公开(公告)号：US20150162725A1

公开(公告)日：2015-06-11

申请号：US14538262

申请日：2014-11-11

Applicant: NGK Spark Plug Co., LTD.

Inventor： Tatsunori YAMADA ,  Yusuke FUJI ,  Tomoyuki IGARASHI ,  Kei TAKAHASHI

IPC: H01T13/32

CPC classification number: H01T13/32

Abstract: A spark plug includes: an insulator having an axial hole; a conductive member disposed around the insulator; a center electrode disposed inside the axial hole, having a bar shape extending in the axial direction, and located on a rear end side with respect to a front end of the conductive member; a ground electrode forming a spark gap between the ground electrode and the center electrode; and a connection part including a plurality of spokes extending in a radial direction whose inner ends are connected to the ground electrode, and connecting the conductive member to the ground electrode. The connection part includes a joint part that is jointed to an inner surface of the conductive member, and the ground electrode has at least one of a notch and a groove at a position that is different from a position connected to the spokes in a circumferential direction.

Abstract translation: 火花塞包括：具有轴向孔的绝缘体; 设置在所述绝缘体周围的导电构件; 设置在所述轴向孔内的中心电极，所述中心电极具有沿轴向延伸的杆状，并且相对于所述导电构件的前端位于后端侧; 在接地电极和中心电极之间形成火花隙的接地电极; 以及连接部，其包括在其内端与接地电极连接的径向延伸的多个辐条，并且将导电部件连接到接地电极。 连接部包括与导电部件的内表面接合的接合部，并且接地电极具有与沿着圆周方向连接到辐条的位置不同的位置的凹口和凹槽中的至少一个 。

公开(公告)号：US20150145403A1

公开(公告)日：2015-05-28

申请号：US14552855

申请日：2014-11-25

Applicant: NGK Spark Plug Co., Ltd.

Inventor： Hironobu MIZUTANI ,  Kei TAKAHASHI

IPC: H01T13/32

CPC classification number: H01T13/32 ,  H01T13/20 ,  H01T13/52

Abstract: An ignition plug having a center electrode, a grounding electrode, an insulator, and a metal shell. The center electrode is held by the insulator, and the insulator is held by metal shell. A cavity is formed between the grounding electrode and the center electrode. The grounding electrode is joined to the inner wall surface of the metal shell via a melting portion. In the melting portion, in a predetermined cutting surface MS including a melting deepest point DP and a central axis CX, a percentage ratio MDD of a melting depth MD of the melting portion with respect to a thickness of the grounding electrode is 5% or more, and an area Sm of a portion included in an outer circumferential side of the metal shell is 10% or more of the entire area S.

Abstract translation: 具有中心电极，接地电极，绝缘体和金属壳的火花塞。 中心电极由绝缘体保持，绝缘体由金属壳保持。 在接地电极和中心电极之间形成空腔。 接地电极通过熔化部分与金属壳体的内壁表面接合。 在熔融部分中，在包括熔融深度点DP和中心轴线CX的预定切割表面MS中，熔化部分的熔化深度MD相对于接地电极的厚度的百分比MDD为5％以上 金属壳的外周侧的部分的面积Sm为整个面积S的10％以上。

公开(公告)号：US20200287359A1

公开(公告)日：2020-09-10

申请号：US16763601

申请日：2019-01-18

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Kei TAKAHASHI ,  Daisuke KASAHARA

IPC: H01T13/46 ,  H01T13/32

Abstract: A spark plug includes: a central electrode extending from a front end side to a rear end side along an axis; an insulator including a front end section formed to be a bottomed tube surrounding a tip of the central electrode; a metal shell shaped to be tubular and structured to support the insulator such that the front end section of the insulator projects to the front end side from a front end section of the metal shell; and a plurality of ground electrodes each of which includes a first end forming a discharge gap with the front end section of the insulator and includes a second end connected to the front end section of the metal shell. The plurality of ground electrodes include a pair of ground electrodes different from each other in size of their discharge gaps.

公开(公告)号：US20160079739A1

公开(公告)日：2016-03-17

申请号：US14839022

申请日：2015-08-28

Applicant: NGK Spark Plug Co., LTD.

Inventor： Koji OKAZAKI ,  Kei TAKAHASHI ,  Kazuhiko MORI

IPC: H01T13/20 ,  H01T13/08

CPC classification number: H01T13/20 ,  H01T13/08 ,  H01T13/467 ,  H01T13/54

Abstract: A spark plug includes: a metallic shell having a through hole extending in a direction of an axis; a cap covering an opening in the metallic shell; a melt portion formed between the cap and the metallic shell to join the cap and the metallic shell to each other; and a gap extending from a specific space which is surrounded by the metallic shell and the cap to the melt portion and interposed between the metallic shell and the cap.

Abstract translation: 火花塞包括：金属壳，具有沿轴线方向延伸的通孔; 覆盖金属壳体中的开口的盖子; 形成在所述盖和所述金属壳之间以将所述盖和所述金属壳彼此接合的熔体部分; 以及从金属壳和盖被包围的特定空间延伸到熔融部分并且插入在金属壳和盖之间的间隙。

公开(公告)号：US20170201074A1

公开(公告)日：2017-07-13

申请号：US15399958

申请日：2017-01-06

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Masaki TOKUMARU ,  Kazuhiko MORI ,  Kei TAKAHASHI ,  Hironobu MIZUTANI

IPC: H01T13/39 ,  H01T13/32

CPC classification number: H01T13/39 ,  H01T13/32

Abstract: A spark plug includes a central electrode and a noble metal tip, which are joined together with a fusion portion interposed therebetween. A tip-adjoining boundary of the fusion portion has a shape that curves convexly toward the fusion portion. A central-electrode-adjoining boundary of the fusion portion has a shape that curves convexly toward the central electrode. The outline of a portion of the fusion portion exposed to the outer surface has a shape that curves concavely into the inner side of the fusion portion.

公开(公告)号：US20150145402A1

公开(公告)日：2015-05-28

申请号：US14555119

申请日：2014-11-26

Applicant: NGK Spark Plug Co., LTD.

Inventor： Yukinobu HASEGAWA ,  Kei TAKAHASHI

IPC: H01T13/32 ,  H01T21/02 ,  H01T13/20 ,  H01T13/46

CPC classification number: H01T13/32 ,  H01T13/467 ,  H01T21/02

Abstract: A spark plug includes a center electrode, a ground electrode, and a cylindrical metal shell. The ground electrode is welded to the metal shell via a weld portion. The weld portion is formed along the outer circumference end part of an annular part in the ground electrode. The weld portion has a plurality of melt extending parts extending toward the inner circumference side from the outer circumference end part of the annular part and aligned such that adjacent ones are connected to each other at the end part. The plurality of melt extending parts partially include smaller melt extending parts whose melting depth is smaller than others.

Abstract translation: 火花塞包括中心电极，接地电极和圆柱形金属壳。 接地电极通过焊接部分焊接到金属外壳。 焊接部沿着接地电极的环状部的外周端部形成。 焊接部具有从环状部的外周端部向内周侧延伸的多个熔融延伸部，并使其相邻，在端部彼此连接。 多个熔体延伸部分部分地包括较小的熔化延伸部分，其熔化深度小于其它熔化物延伸部分。

公开(公告)号：US20140042893A1

公开(公告)日：2014-02-13

申请号：US13957918

申请日：2013-08-02

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Yasushi SAKAKURA ,  Yukinobu HASEGAWA ,  Kei TAKAHASHI

IPC: H01T13/32

CPC classification number: H01T13/32 ,  H01T13/20 ,  H01T13/39

Abstract: A spark plug includes a tip joined to a center electrode. The coefficient of linear thermal expansion of the center electrode is greater than that of the tip. The tip has a gap-forming portion having a maximum width of 1.2 mm or greater and forming a gap in cooperation with the ground electrode and a to-be-joined portion joined to the center electrode. At a position A which is shifted 0.1 mm from the forward end of the outer surface of the fusion portion toward the forward end side, the width of the to-be-joined portion measured on the cross section is smaller than the width of the gap-forming portion. The to-be-joined portion satisfies Dtw/Dw≦1.1, where Dtw represents the width of the to-be-joined portion at the position A, and Dw represents the width of the fusion portion at the forward end of the outer surface thereof.

Abstract translation: 火花塞包括连接到中心电极的尖端。 中心电极的线性热膨胀系数大于尖端的线性热膨胀系数。 尖端具有最大宽度为1.2mm以上的间隙形成部，与接地电极和与中心电极接合的被接合部配合形成间隙。 在从熔融部的外表面的前端朝向前端侧偏移0.1mm的位置A处，在截面上测量的被接合部的宽度小于间隙的宽度 形成部分。 待接合部分满足Dtw / Dw @ 1.1，其中Dtw表示在位置A处的被接合部分的宽度，Dw表示在其外表面的前端处的熔化部分的宽度 。