公开(公告)号：US11005237B2

公开(公告)日：2021-05-11

申请号：US16902321

申请日：2020-06-16

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Seiji Nakano ,  Kengo Fujimura ,  Shoma Tsumagari

IPC: H01T13/34

Abstract: An ignition plug comprising: an insulator having a through hole extending from a rear-end side toward a forward-end side; a center electrode inserted at least partially into a portion of the through hole on the forward-end side; a metal terminal member inserted at least partially into a portion of the through hole on the rear-end side; and a seal disposed within the through hole and in contact with the center electrode and an inner circumferential surface of the insulator. The seal contains a glass and an electrically conductive substance, and the glass contained in the seal contains Si in an amount of 50 mass % or more as reduced to SiO2 and Na in an amount of 0.1 mass % or more and less than 1 mass % as reduced to Na2O.

公开(公告)号：US10153622B1

公开(公告)日：2018-12-11

申请号：US16001451

申请日：2018-06-06

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Hironori Uegaki ,  Shoma Tsumagari ,  Kazuhiro Kurosawa ,  Katsuya Takaoka ,  Kuniharu Tanaka

IPC: H01T13/34 ,  H01T13/41

CPC classification number: H01T13/41 ,  H01T13/34

Abstract: A spark plug has an insulator, a rod-shaped electrode member disposed in an axial hole of the insulator, and a cylindrical magnetic member disposed on an outer circumference of the electrode member within the axial hole. The insulator includes a large inner diameter region, a middle inner diameter region located frontward of the large inner diameter region and having an inner diameter smaller than that of the large inner diameter region, and a small inner diameter region located frontward of the middle inner diameter region and having an inner diameter smaller than that of the middle inner diameter region. The electrode member is retained on a step portion of the insulator between the middle inner diameter region and the small inner diameter region. The magnetic member is positioned in the axial hole at a location within the large inner diameter region.