公开(公告)号：US20160079739A1

公开(公告)日：2016-03-17

申请号：US14839022

申请日：2015-08-28

Applicant: NGK Spark Plug Co., LTD.

Inventor： Koji OKAZAKI ,  Kei TAKAHASHI ,  Kazuhiko MORI

IPC: H01T13/20 ,  H01T13/08

CPC classification number: H01T13/20 ,  H01T13/08 ,  H01T13/467 ,  H01T13/54

Abstract: A spark plug includes: a metallic shell having a through hole extending in a direction of an axis; a cap covering an opening in the metallic shell; a melt portion formed between the cap and the metallic shell to join the cap and the metallic shell to each other; and a gap extending from a specific space which is surrounded by the metallic shell and the cap to the melt portion and interposed between the metallic shell and the cap.

Abstract translation: 火花塞包括：金属壳，具有沿轴线方向延伸的通孔; 覆盖金属壳体中的开口的盖子; 形成在所述盖和所述金属壳之间以将所述盖和所述金属壳彼此接合的熔体部分; 以及从金属壳和盖被包围的特定空间延伸到熔融部分并且插入在金属壳和盖之间的间隙。

公开(公告)号：US20180212405A1

公开(公告)日：2018-07-26

申请号：US15565776

申请日：2016-03-28

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Kentaro KIUCHI ,  Kazuhiko MORI ,  Hironobu MIZUTANI ,  Yuusuke TERANISHI

IPC: H01T13/36 ,  H01T13/02 ,  H01T21/02

CPC classification number: H01T13/36 ,  H01T13/02 ,  H01T21/02

Abstract: A spark plug having a ceramic insulator held by a crimp portion of a metallic shell. The crimp portion satisfies a relation of A≥1.7 mm and a relation of t≥1.20 mm in a cross section of the crimp portion taken along a plane containing the axial line, where A is the distance between a closest point which is a point within the cross section closest to the ceramic insulator and an intersection at which a first orthogonal line passing through the closest point and orthogonal to the axial line intersects with an outer circumference of the crimp portion, and t is a thickness of the proximal end of the crimp portion.

公开(公告)号：US20170201074A1

公开(公告)日：2017-07-13

申请号：US15399958

申请日：2017-01-06

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Masaki TOKUMARU ,  Kazuhiko MORI ,  Kei TAKAHASHI ,  Hironobu MIZUTANI

IPC: H01T13/39 ,  H01T13/32

CPC classification number: H01T13/39 ,  H01T13/32

Abstract: A spark plug includes a central electrode and a noble metal tip, which are joined together with a fusion portion interposed therebetween. A tip-adjoining boundary of the fusion portion has a shape that curves convexly toward the fusion portion. A central-electrode-adjoining boundary of the fusion portion has a shape that curves convexly toward the central electrode. The outline of a portion of the fusion portion exposed to the outer surface has a shape that curves concavely into the inner side of the fusion portion.