公开(公告)号：US20170063048A1

公开(公告)日：2017-03-02

申请号：US15245583

申请日：2016-08-24

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Tatsuya GOZAWA ,  Daisuke SUMOYAMA ,  Tsutomu SHIBATA

IPC: H01T13/32 ,  H01T21/02

CPC classification number: H01T13/32 ,  H01T13/39 ,  H01T21/02

Abstract: A spark plug comprising a center electrode, a ground electrode disposed on the center electrode across a gap, and a tip joined to an opposed surface of the ground electrode that is opposed to the center electrode, the tip has a discharge layer and a relieving layer, the relieving layer is formed from a Pt—Ni alloy and joined to the opposed surface via a diffusion layer, the discharge layer is formed from a Pt—Rh alloy and joined via a clad diffusion layer to a side of the relieving layer opposite to a side of the relieving layer at which the ground electrode is joined, and 0.81≦A/B≦1.21 is satisfied when an average cross-sectional area of the discharge layer is A mm2 and an average cross-sectional area of the relieving layer is B mm2, and a method for producing the spark plug.

Abstract translation: 一种火花塞，包括中心电极，设置在中心电极上的间隙的接地电极以及与所述接地电极的与所述中心电极相对的相对表面接合的尖端，所述尖端具有放电层和释放层 缓冲层由Pt-Ni合金形成，并通过扩散层与相对表面接合，放电层由Pt-Rh合金形成，并通过包层扩散层与缓冲层的相反侧相接合 在放电层的平均截面积为Amm2且缓和层的平均截面积为（平均）截面积为...的情况下，满足接地电极的缓和层的一侧为0.81≤A/B≤1.21 Bmm2，以及火花塞的制造方法。

公开(公告)号：US20160294164A1

公开(公告)日：2016-10-06

申请号：US15036572

申请日：2014-09-10

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Daisuke SUMOYAMA ,  Tsutomu SHIBATA

IPC: H01T13/39

CPC classification number: H01T13/39 ,  B32B15/01 ,  B32B15/018 ,  C22C5/04 ,  C22C19/03 ,  C22C19/05 ,  C22C19/058

Abstract: A spark plug that includes a center electrode and a ground electrode. The center electrode is disposed providing a gap with the center electrode. At least one of the center electrode and the ground electrode includes a tip forming the gap. The tip includes a main body portion and a front surface layer. A composition of the main body portion is Pt as a main constituent and Rh of 5 mass % or more and Ni of 0 mass % or more to less than 8 mass %. The front surface layer is disposed at least at a surface radially outside of an axial line extending in a direction from a center of the main body portion to the gap. The front surface layer contains Ni of 8 mass % or more and has a thickness of 2 μm or more.

Abstract translation: 一种包括中心电极和接地电极的火花塞。 中心电极设置成与中心电极间隙。 中心电极和接地电极中的至少一个包括形成间隙的尖端。 尖端包括主体部分和前表面层。 主体部分的组成为Pt为主要成分，Rh为5质量％以上，Ni为0质量％以上且小于8质量％。 前表面层至少设置在从主体部的中心向间隙延伸的轴线的径向外侧的表面。 前表面层含有8质量％以上的Ni，其厚度为2μm以上。

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.