公开(公告)号：US08922104B1

公开(公告)日：2014-12-30

申请号：US14330420

申请日：2014-07-14

Applicant: NGK Spark Plug Co., Ltd.

Inventor： Masahiro Inoue ,  Satoshi Nagasawa

IPC: H01T13/39 ,  H01T13/32 ,  H01T13/20 ,  H01T21/02

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

Abstract: A spark plug includes a center electrode, a ground electrode, and a ground-electrode-side tip joined to the ground electrode such that at least a portion of the tip along its thickness direction is embedded in the ground electrode. The ground-electrode-side tip is joined to the ground electrode through a fusion zone formed between the ground electrode and a proximal side of the tip. On a section containing a center axis of the ground electrode and in parallel with the thickness direction of the ground-electrode-side tip, E/F≧1.1 is satisfied, where E (mm) is the longest distance along the thickness direction from an inner side of the ground electrode to a boundary between the fusion zone and the ground electrode, and F (mm) is the largest amount of embedment of the tip in the inner side surface along the thickness direction.

Abstract translation: 火花塞包括中心电极，接地电极和接地电极侧末端，接地电极侧尖端沿着其厚度方向的至少一部分嵌入到接地电极中。 接地电极侧端部通过形成在接地电极和尖端的近侧之间的熔融区域接合到接地电极。 在包含接地电极的中心轴并且与接地电极侧端部的厚度方向平行的部分上，满足E /F≥1.1，其中E（mm）是沿着厚度方向的最长距离 接地电极的内侧到熔融区域和接地电极之间的边界，并且F（mm）是尖端沿着厚度方向在内侧表面中嵌入的最大量。

公开(公告)号：US10063036B2

公开(公告)日：2018-08-28

申请号：US15264971

申请日：2016-09-14

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Yohei Kozakai ,  Satoshi Nagasawa ,  Akira Suzuki

IPC: H01T13/20 ,  H01T13/36 ,  H01T13/12 ,  H01T13/39

CPC classification number: H01T13/20 ,  H01T13/12 ,  H01T13/36 ,  H01T13/39

Abstract: A spark plug includes an insulator having an axial hole formed therethrough in the direction of an axis of the spark plug, a center electrode disposed in a front side of the axial hole and a metal shell disposed around an outer circumference of the insulator and having a collar-shaped tool engagement portion and a crimp portion located on a rear side of the tool engagement portion and reduced in diameter toward the rear, wherein the crimp portion of the metal shell is made of a carbon steel material having a grain size number equal to or greater than No. 11 as measured according to JIS G 0551.

公开(公告)号：US09270087B2

公开(公告)日：2016-02-23

申请号：US14469005

申请日：2014-08-26

Applicant: NGK Spark Plug Co., Ltd.

Inventor： Satoshi Nagasawa ,  Akira Suzuki

IPC: H01T13/32 ,  H01T13/16

CPC classification number: H01T13/16 ,  H01T13/32

Abstract: A spark plug has a metal shell and a ground electrode joined at a base end portion thereof to the metal shell and includes a surface layer and a core higher in thermal conductivity than the surface layer. The core includes a first core member and a second core member. A weld region, where the ground electrode is joined to the metal shell, has an undulating shape. A distance between frontmost and rearmost ends of a part of the weld region in contact with the first core member in the axis direction is 0.15 mm or more.

Abstract translation: 火花塞具有金属壳和接地电极，其基端部连接到金属壳，并且包括具有比表面层更高的导热性的表面层和芯。 芯部包括第一芯部件和第二芯部件。 接地电极与金属外壳接合的焊接区域具有起伏的形状。 焊接区域的与轴芯方向接触的部分的最前端与最后端之间的距离为0.15mm以上。

公开(公告)号：US20150022074A1

公开(公告)日：2015-01-22

申请号：US14330420

申请日：2014-07-14

Applicant: NGK Spark Plug Co., Ltd.

Inventor： Masahiro Inoue ,  Satoshi Nagasawa

IPC: H01T13/20 ,  H01T21/02

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

Abstract: A spark plug includes a center electrode, a ground electrode, and a ground-electrode-side tip joined to the ground electrode such that at least a portion of the tip along its thickness direction is embedded in the ground electrode. The ground-electrode-side tip is joined to the ground electrode through a fusion zone formed between the ground electrode and a proximal side of the tip. On a section containing a center axis of the ground electrode and in parallel with the thickness direction of the ground-electrode-side tip, E/F≧1.1 is satisfied, where E (mm) is the longest distance along the thickness direction from an inner side of the ground electrode to a boundary between the fusion zone and the ground electrode, and F (mm) is the largest amount of embedment of the tip in the inner side surface along the thickness direction.

Abstract translation: 火花塞包括中心电极，接地电极和接地电极侧末端，接地电极侧尖端沿着其厚度方向的至少一部分嵌入到接地电极中。 接地电极侧端部通过形成在接地电极和尖端的近侧之间的熔融区域接合到接地电极。 在包含接地电极的中心轴并且与接地电极侧端部的厚度方向平行的部分上，满足E /F≥1.1，其中E（mm）是沿着厚度方向的最长距离 接地电极的内侧到熔融区域和接地电极之间的边界，并且F（mm）是尖端沿着厚度方向在内侧表面中嵌入的最大量。