公开(公告)号：US20190288487A1

公开(公告)日：2019-09-19

申请号：US16285463

申请日：2019-02-26

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Daisuke SUMOYAMA ,  Kazuki ITO

IPC: H01T13/39

Abstract: A spark plug including a center electrode with a tip welded to a front end portion with a fused portion therebetween. The front end portion contains Ni, Cr, and at least one element selected from a group B consisting of Mn, Si, Al, Ti, rare earth elements, Hf, and Zr. Ni is present in the largest proportion, and Cr is present in the second largest proportion and in an amount of 12% by mass or more. The at least one element selected from the group B is present in a total amount of 0.1% by mass or more. The front end portion satisfies f/e≤0.15 and m/e≤0.015, where f is the Fe content, e is the sum of the Cr, Si, and Al contents, and m is the Mo content.

公开(公告)号：US20180366918A1

公开(公告)日：2018-12-20

申请号：US16072425

申请日：2016-10-17

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Daisuke SUMOYAMA ,  Tatsuya GOZAWA ,  Tsutomu SHIBATA

IPC: H01T13/39 ,  C22C5/04 ,  H01T21/02 ,  H01T13/32

CPC classification number: H01T13/39 ,  C22C5/04 ,  C22C30/00 ,  H01T13/20 ,  H01T13/32 ,  H01T21/02

Abstract: An electrode base material of the spark plug contains not less than 50 wt. % of Ni. A discharge member contains not less than 45 wt. % of Pt, and at least one of Ni and Rh. An intermediate member contains Pt and Ni. In the discharge member, a content of Pt is highest, and a total content of Pt, Rh, and Ni is not less than 92 wt. %. In the intermediate member, a content of one of Pt and Ni is not less than 50 wt. %, a content of Ni is higher than a content of Ni in the discharge member, and a total content of Pt, Rh, and Ni is not less than 85 wt. %. A thickness of the diffusion layer formed between the discharge member and the intermediate member is not less than 0.002 mm and not more than 0.065 mm.

公开(公告)号：US20180019581A1

公开(公告)日：2018-01-18

申请号：US15646559

申请日：2017-07-11

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Daisuke SUMOYAMA ,  Takuto NAKADA ,  Tsutomu SHIBATA ,  Takaaki KIKAI

IPC: H01T13/39 ,  H01T13/10 ,  H01T13/32 ,  H01T13/38

CPC classification number: H01T13/39 ,  H01T13/10 ,  H01T13/20 ,  H01T13/32 ,  H01T13/38

Abstract: At least one of a center electrode and a ground electrode of a spark plug includes an electrode body, an electrode tip, and a welded portion formed between the electrode body and the electrode tip. The electrode tip includes a cover layer that covers at least a side surface of a tip body, and the cover layer is formed of IrAl. On a section formed by cutting the electrode tip near a boundary with the welded portion, an area of the tip body is represented by Sa. An area of a projection on the section of a non-contact portion of an opposite surface of the tip body not in contact with the welded portion is represented by Sb. In this case, Sa−Sb corresponds to 35% or more of Sa.

公开(公告)号：US20180019580A1

公开(公告)日：2018-01-18

申请号：US15623817

申请日：2017-06-15

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Kazuki ITO ,  Daisuke SUMOYAMA ,  Tsutomu SHIBATA

IPC: H01T13/39 ,  H01T13/16

CPC classification number: H01T13/39 ,  C22C19/058 ,  H01T13/16

Abstract: A spark plug having a center electrode and a ground electrode that form a gap therebetween. At least one of the center electrode and the ground electrode includes a portion formed of a nickel alloy containing nickel as a major component and 20% by mass or more of chromium. In the portion, formed of the nickel alloy, of the electrode, the content of silicon is 0.1% by mass or more, the total content of one or more particular elements selected from the group consisting of rare earth elements is 0.01% by mass or more, and the area percentage of voids in the total area of a cross-section parallel to a longitudinal direction is 1% or less.