公开(公告)号：US20150102720A1

公开(公告)日：2015-04-16

申请号：US14506141

申请日：2014-10-03

Applicant: NGK Spark Plug Co., LTD.

Inventor： Yasushi SAKAKURA ,  Yukinobu HASEGAWA

IPC: H01T13/39

CPC classification number: H01T13/39 ,  H01T21/02

Abstract: A spark plug includes an electrode wherein a plurality of fusion regions are formed by melting to each other a circular noble metal tip having a diameter of not less than 2 mm and a base material disposed around an outer periphery of the noble metal tip. In a particular tip cross section, a total length of the portions passing the fusion region on the circumference of a circle A concentric to an outline of the tip and having a diameter of 90% of the length of the tip is not less than 30% of the length of the circumference of the concentric circle A, and a total length of the portions on which a circumference of a concentric circle B, having the same diameter as that of the outline passes, is not less than 30% of the length of the circumference of the concentric circle B.

Abstract translation: 火花塞包括电极，其中通过彼此熔化直径不小于2mm的圆形贵金属尖端形成多个熔融区域，并且设置在贵金属电极头的外周周围的基材。 在特定的尖端截面中，通过与尖端的轮廓同心并具有尖端长度的90％直径的圆A的圆周上的熔融区域的部分的总长度不小于30％ 同心圆A的圆周长度的长度，并且具有与轮廓直径相同的直径的同心圆B的圆周的部分的总长度不小于轮廓长度的30％ 同心圆B的周长

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 。

公开(公告)号：US20130285532A1

公开(公告)日：2013-10-31

申请号：US13869340

申请日：2013-04-24

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Yasushi SAKAKURA

IPC: H01T13/20

CPC classification number: H01T13/20 ,  H01T13/32

Abstract: A spark plug comprises an insulator having a axial hole penetrating in a direction of an axis, a central electrode provided on the front end side of the axial hole, a tubular metal shell that holds the insulator, and a ground electrode including a surface layer and a core material that is surrounded by the surface layer and has a larger thermal conductivity than that of the surface layer. The metal shell of the spark plug has a protruding portion in which at least a part of the metal shell protrudes toward the front end side in the direction of the axis. The ground electrode has an end surface at one end portion thereof joined to the inside of the protruding portion and the other end portion thereof facing the central electrode.

Abstract translation: 火花塞包括具有沿轴线方向贯穿的轴向孔的绝缘体，设置在轴向孔的前端侧的中心电极，保持绝缘体的管状金属壳，以及包括表面层的接地电极和 由表面层包围并且具有比表面层的导热性更大的导热性的芯材料。 火花塞的金属外壳具有突出部分，其中金属壳体的至少一部分在轴线方向上朝向前端侧突出。 接地电极的一端部的端面与突出部的内侧接合，另一端部面向中心电极。

公开(公告)号：US20200244048A1

公开(公告)日：2020-07-30

申请号：US16742977

申请日：2020-01-15

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Takashi SEKIZAWA ,  Tomokatsu KASHIMA ,  Yasushi SAKAKURA

IPC: H01T13/39 ,  H01T21/02 ,  H01T21/06

Abstract: A spark plug including a ground electrode including a base material, a tip having a discharge surface, and a melt portion interposed over an entire area between the tip and the base material and joining the tip to the base material; and a center electrode with a spark gap formed between the center electrode and the discharge surface. The tip has, in an inner area surrounded by an outer peripheral portion of the tip, a thin portion in which a distance between the discharge surface and the melt portion is shorter than a distance between the discharge surface and the melt portion in the outer peripheral portion. The thin portion extends from a part of the outer peripheral portion to a part other than the part of the outer peripheral portion.

公开(公告)号：US20180375300A1

公开(公告)日：2018-12-27

申请号：US16062357

申请日：2016-10-11

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Yukinobu HASEGAWA ,  Yasushi SAKAKURA

IPC: H01T13/39 ,  H01T13/32 ,  H01T21/02

Abstract: An ignition plug includes a ground electrode tip disposed in through hole through a ground electrode base material, a discharge surface of the ground electrode tip being exposed to the center electrode side from the through hole; and a fixing member disposed in the through hole at a part on a second direction side with respect to the large diameter surface.

公开(公告)号：US20180351331A1

公开(公告)日：2018-12-06

申请号：US15780484

申请日：2016-09-13

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Yukinobu HASEGAWA ,  Yasushi SAKAKURA

IPC: H01T13/32

CPC classification number: H01T13/20 ,  H01T13/32 ,  H01T13/39 ,  H01T21/02

Abstract: A spark plug includes a center electrode, an electrode tip having a discharge surface, and an opposite surface having a diameter greater than that of the discharge surface and located opposite the discharge surface, a tip holding element having a through hole, a ground electrode body having a recess, and a fusion portion formed at at least a portion of the boundary between the outer side surface of the tip holding element and the inner side surface of the recess.

公开(公告)号：US20190020180A1

公开(公告)日：2019-01-17

申请号：US16031463

申请日：2018-07-10

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Masaki TOKUMARU ,  Yasushi SAKAKURA

IPC: H01T13/34 ,  H01T13/36

Abstract: A spark plug having an insulator that includes a fitted portion in contact with a rear end surface of a ledge portion of a metal shell. The insulator has a recessed portion recessed radially inward. The recessed portion is formed in an outer circumferential surface which is located on the rear side of the insulator relative to the fitted portion and which is disposed in the metal shell. The area of an outer circumferential surface of the insulator, from a front end of the recessed portion to a front end of the fitted portion, is larger than or equal to the area of a surface of the insulator which is exposed to combustion gas.

公开(公告)号：US20160141840A1

公开(公告)日：2016-05-19

申请号：US14896506

申请日：2014-03-06

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Yuichi MATSUNAGA ,  Yasushi SAKAKURA

IPC: H01T13/32

CPC classification number: H01T13/32 ,  H01T13/16 ,  H01T13/39 ,  H01T13/467 ,  H01T13/54

Abstract: A spark plug (1) includes an insulator (2) having an axial hole (4), a center electrode (5) inserted into the axial hole (4), a metallic shell (3) provided around the insulator (2), a ground electrode (27) whose base end portion is fixed to the metallic shell (3) and which has an annular portion (27A) formed at a forward end portion thereof, the center electrode (5) being disposed radially inward of the annular portion (27A), and an annular tip (32) which is joined to the inner circumference of the annular portion (27A) and which forms a spark discharge gap (28) between the center electrode (5) and the inner circumferential surface of the annular tip (32). Recesses (35) are provided on at least one of the inner and outer circumferences of the annular portion (27A).

Abstract translation: 火花塞（1）包括具有轴向孔（4）的绝缘体（2），插入到轴向孔（4）中的中心电极（5），设置在绝缘体（2）周围的金属壳体（3） 接地电极（27），其基端部固定在金属壳（3）上，并且在其前端形成有环状部（27A），中心电极（5）位于环状部的径向内侧 27A），以及与环状部（27A）的内周接合并在中心电极（5）与环状端部的内周面之间形成火花放电间隙（28）的环形端部（32） （32）。 凹部（35）设置在环状部（27A）的内周和外周的至少一个上。

公开(公告)号：US20160087411A1

公开(公告)日：2016-03-24

申请号：US14787508

申请日：2014-05-21

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Yasushi SAKAKURA

IPC: H01T13/39 ,  H01T13/32

CPC classification number: H01T13/39 ,  H01T13/32 ,  H01T13/467

Abstract: A spark plug including a center electrode, an insulator, a metal shell, a first ground electrode, and a second ground electrode. The center electrode extends in an axial direction. The insulator has an axial hole extending in the axial direction. The center electrode is to be inserted into the axial hole. The metal shell is arranged at an outer periphery of the insulator. The first ground electrode has electrical continuity with the metal shell, and forms a first gap with a front end surface of the center electrode. The second ground electrode has electrical continuity with the metal shell, is sealed to metal shell, extends from the metal shell to a position facing a side surface of the center electrode, and forms an annular second gap between the side surface of the center electrode and an inner peripheral surface of the second ground electrode.

Abstract translation: 一种火花塞，包括中心电极，绝缘体，金属壳，第一接地电极和第二接地电极。 中心电极沿轴向延伸。 绝缘体具有沿轴向延伸的轴向孔。 中心电极插入到轴向孔中。 金属外壳布置在绝缘体的外周。 第一接地电极与金属壳具有电连续性，并与中心电极的前端表面形成第一间隙。 第二接地电极与金属壳具有电连续性，被密封到金属壳，从金属壳延伸到面对中心电极的侧表面的位置，并且在中心电极的侧表面和 第二接地电极的内周面。

公开(公告)号：US20150130345A1

公开(公告)日：2015-05-14

申请号：US14536782

申请日：2014-11-10

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Yasushi SAKAKURA ,  Yukinobu HASEGAWA

IPC: H01T13/32 ,  H01T21/02

CPC classification number: H01T13/32 ,  H01T21/02

Abstract: A ground electrode comprised of a noble metal tip having an outer circumferential surface, a holder having an inner circumferential surface defining a through hole for the noble metal tip thereon, and a body to which the holder is joined. At least one of a) the inner circumferential surface of the holder which forms the through hole, and b) the outer circumferential surface of the noble metal tip which is disposed in the through hole, continuously reduces in diameter toward the forward side. A forward end surface of the noble metal tip is located on a forward side with respect to a forward end surface of the holder.

Abstract translation: 一种由具有外周面的贵金属端头构成的接地电极，具有限定用于贵金属电极头的通孔的内周面的保持器和保持器接合的主体。 a）形成通孔的保持器的内周面和b）设置在通孔中的贵金属电极头的外周面中的至少一个朝向前侧连续减小直径。 贵金属电极头的前端面相对于支架的前端面位于前侧。