公开(公告)号：US10277012B2

公开(公告)日：2019-04-30

申请号：US16106103

申请日：2018-08-21

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Kazuhiro Kurosawa ,  Katsuya Takaoka ,  Kota Yokoyama ,  Kuniharu Tanaka ,  Hirokazu Kurono ,  Hironori Uegaki

IPC: H01T13/05 ,  C01G49/02 ,  C01G51/04 ,  C01G53/04 ,  C01G53/00

Abstract: A spark plug having a connection portion disposed between a metal terminal and a center electrode. The connection portion includes: a magnetic substance formed from a Fe-containing oxide; a conductor which is a wire helically disposed on an outer periphery of the magnetic substance and electrically connected to the metal terminal and the center electrode; and an intermediate member which is in contact with the magnetic substance, the conductor, and an inner peripheral surface of the insulator, is disposed between the magnetic substance and the conductor, and the inner peripheral surface of the insulator, and has lower electrical conductivity than the conductor. The conductor is made of one or more of an oxide conductor, carbon, and a carbon compound.

公开(公告)号：US10270228B2

公开(公告)日：2019-04-23

申请号：US16106187

申请日：2018-08-21

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Kazuhiro Kurosawa ,  Katsuya Takaoka ,  Kota Yokoyama ,  Kuniharu Tanaka ,  Hirokazu Kurono ,  Hironori Uegaki

IPC: H01T13/41 ,  H01T13/34 ,  C22C19/03 ,  H01T13/05

Abstract: A spark plug having a connection portion disposed in the axial hole and between a metal terminal and a center electrode. The connection portion includes: a magnetic substance formed from a Fe-containing oxide; a conductor helically disposed on an outer periphery of the magnetic substance and electrically connected to the metal terminal and the center electrode; and an intermediate member disposed between the magnetic substance and the conductor, and an inner peripheral surface of the insulator and having lower electrical conductivity than the conductor. The conductor includes a base and a conductive layer disposed on an outer periphery of the base and having higher electrical conductivity than the base, and the conductive layer has a thickness of larger than 0.1 μm and equal to or smaller than 25 μm.