公开(公告)号：US20130334954A1

公开(公告)日：2013-12-19

申请号：US13914804

申请日：2013-06-11

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Kenji Moritani ,  Hiroaki Nasu ,  Makoto Sugita

IPC: H01T13/20

CPC classification number: H01T13/20 ,  H01T21/02

Abstract: A spark plug includes an insulator extending along an axis and a metal shell provided on the outer periphery of the insulator. The metal shell includes a thread portion for threadedly engaging with a mounting hole of an internal combustion engine and a seat portion having a tapered surface whose outer diameter decreases gradually toward a leading end side. The tapered surface contacts with a bearing surface of the internal combustion engine when the thread portion is engaged with the mounting hole. Annular protruding portions or a helical protruding portion are formed within a range on the tapered surface from an outermost peripheral portion to a part forming an outer diameter occupying 95% of the diameter of the outermost peripheral portion. The arithmetic mean roughness of a surface of the tapered surface within the range is set to 1-5 μm on a section including the axis.

Abstract translation: 火花塞包括沿着轴线延伸的绝缘体和设置在绝缘体的外周上的金属壳。 金属壳包括用于与内燃机的安装孔螺纹接合的螺纹部分和具有锥形表面的座部，其外径朝向前端侧逐渐减小。 当螺纹部与安装孔接合时，锥面与内燃机的支承面接触。 环形突出部或螺旋形突出部形成在从最外周部到形成外径占最外周部的直径的95％的部分的锥形面的范围内。 该范围内的锥面的表面的算术平均粗糙度在包括轴的截面上设定为1-5μm。

公开(公告)号：US09197038B1

公开(公告)日：2015-11-24

申请号：US14726766

申请日：2015-06-01

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Masahiro Inoue ,  Kenji Moritani

IPC: H01T13/32 ,  H01T21/02 ,  B23K11/00

CPC classification number: H01T13/32 ,  B23K11/002 ,  H01T13/39 ,  H01T21/02

Abstract: A spark plug including a ground electrode body and an electrode tip that is resistance welded to the ground electrode body and that has a discharge surface. In a specific sectional plane, a welding surface is located in the first direction from an outer surface of the ground electrode body. The welding surface includes a flat portion whose distance to the point P1 in the first direction is 0.05 mm or smaller, and when a point E1 and a point E2 are defined as ends of the flat portion and a second direction is defined as a direction from the point E2 toward the point E1, in the second direction from the point E1, a distance between the welding surface and the discharge surface in the first direction is smaller than a distance between the discharge surface and the point E1 in the first direction.

Abstract translation: 一种火花塞，包括接地电极体和电极焊接点，其电阻焊接到接地电极体并且具有放电表面。 在特定的截面中，焊接面从接地电极体的外表面位于第一方向。 焊接面包括与第一方向上的点P1的距离为0.05mm以下的平坦部，并且当点E1和点E2被定义为平坦部的端部时，第二方向被定义为从 点E1朝向点E1，从点E1起的第二方向，焊接面与排出面之间的距离在第一方向上小于排出面与点E1之间的距离。

公开(公告)号：US08704434B2

公开(公告)日：2014-04-22

申请号：US13914804

申请日：2013-06-11

Applicant: NGK Spark Plug Co., Ltd.

Inventor： Kenji Moritani ,  Hiroaki Nasu ,  Makoto Sugita

IPC: H01T13/04

CPC classification number: H01T13/20 ,  H01T21/02

Abstract: A spark plug includes an insulator extending along an axis and a metal shell provided on the outer periphery of the insulator. The metal shell includes a thread portion for threadedly engaging with a mounting hole of an internal combustion engine and a seat portion having a tapered surface whose outer diameter decreases gradually toward a leading end side. The tapered surface contacts with a bearing surface of the internal combustion engine when the thread portion is engaged with the mounting hole. Annular protruding portions or a helical protruding portion are formed within a range on the tapered surface from an outermost peripheral portion to a part forming an outer diameter occupying 95% of the diameter of the outermost peripheral portion. The arithmetic mean roughness of a surface of the tapered surface within the range is set to 1-5 μm on a section including the axis.

Abstract translation: 火花塞包括沿着轴线延伸的绝缘体和设置在绝缘体的外周上的金属壳。 金属壳包括用于与内燃机的安装孔螺纹接合的螺纹部分和具有锥形表面的座部，其外径朝向前端侧逐渐减小。 当螺纹部与安装孔接合时，锥面与内燃机的支承面接触。 环形突出部或螺旋形突出部形成在从最外周部到形成外径占最外周部的直径的95％的部分的锥形面的范围内。 该范围内的锥面的表面的算术平均粗糙度在包含该轴的截面上被设定为1-5μm。