公开(公告)号：US20190334323A1

公开(公告)日：2019-10-31

申请号：US16310863

申请日：2017-04-25

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Takuya SHIMAMURA

IPC: H01T21/02 ,  H01T13/32

Abstract: A method for manufacturing a spark plug. A first surface having an area larger than or equal to an area making contact with the tip is produced on the electrode base material by performing at least one of polishing and grinding thereon, and a second surface having an area larger than or equal to an area making contact with a first electrode is produced on the electrode base material by performing polishing or the like thereon. Resistance welding is performed by applying current between the first electrode and a second electrode, after the first surface of the electrode base material and the tip have been brought into contact with each other, the first electrode has been brought into contact with the second surface of the electrode base material, and the second electrode has been brought into contact with the tip.

公开(公告)号：US20190123517A1

公开(公告)日：2019-04-25

申请号：US16161469

申请日：2018-10-16

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Takuya SHIMAMURA

IPC: H01T21/02 ,  H01T13/32 ,  G06T7/13 ,  G06T7/00

CPC classification number: H01T21/02 ,  G06T7/0004 ,  G06T7/0006 ,  G06T7/13 ,  G06T2207/30136 ,  G06T2207/30164 ,  H01T13/32

Abstract: Disclosed is a production method of a spark plug in which a ground electrode has an electrode base and a tip welded to a surface of the electrode base via a weld metal. The production method includes an image capture step, an image analysis step and an inspection step. The image capture step is to capture image data about the surface of the electrode base to which the tip has been welded. The image analysis step is to perform analysis of the image data, thereby detecting an edge of the electrode base and an edge of the weld metal, determining a center point of a contour of the weld metal and then detecting an edge of the tip in a specific area of the image data. The inspection step is to inspect a welding position of the tip based on the detected edges of the electrode base and the tip.

公开(公告)号：US20180301878A1

公开(公告)日：2018-10-18

申请号：US15926358

申请日：2018-03-20

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Takuya SHIMAMURA

IPC: H01T21/02 ,  G05B19/4097

CPC classification number: H01T21/02 ,  G05B19/4097 ,  G05B2219/35134 ,  H01T13/20 ,  H01T13/58

Abstract: A spark plug has an electrode including a base portion and a tip joined to a specific surface that is a specific outer surface of the base portion, the tip forming a spark discharge surface. Respective relative positions of a plurality of points on an outer surface of a target portion of the electrode including the base portion and the tip joined to the base portion, which is a portion including at least a portion of the specific surface of the base portion and the tip, are identified to generate three-dimensional coordinate data representing the three-dimensional shape of the target portion. The coordinate data is analyzed to determine whether the target portion of the electrode includes a predetermined unintentional portion that is an unintended portion. An electrode including the unintentional portion is excluded from objects to be manufactured, and an electrode not including the unintentional portion is used to assemble the spark plug.

公开(公告)号：US20150372457A1

公开(公告)日：2015-12-24

申请号：US14767022

申请日：2014-02-12

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Takuya SHIMAMURA ,  Jiro KYUNO

IPC: H01T13/08

CPC classification number: H01T13/08

Abstract: A spark plug includes a metal shell formed with a mounting male thread portion and a radially outwardly protruding seat portion and a solid annular gasket disposed between the male thread portion and the seat portion. The gasket has a recessed portion formed with a depth in the direction of an axis such that the recessed portion has an opening at a front end surface of the gasket located opposite to the seat portion. The front end surface of the gasket includes an inner peripheral front end surface region decreasing in thickness toward an inner periphery of the gasket and an outer peripheral front end surface region formed radially outside the inner peripheral front end surface region. The opening of the recessed portion is located radially inside an innermost periphery of the outer peripheral front end surface region.

Abstract translation: 火花塞包括形成有安装外螺纹部分和径向向外突出的座部分的金属壳和设置在阳螺纹部分和座部之间的实心环形垫圈。 垫圈具有形成在轴线方向上的深度的凹部，使得凹部在位于与座部相对的垫圈的前端表面处具有开口。 垫圈的前端面包括朝向垫圈的内周减小的内周前端面区域和形成在内周前端面区域的径向外侧的外周前端面区域。 凹部的开口位于外周前端面区域的最内周侧的径向内侧。