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公开(公告)号：US09197036B2
公开(公告)日：2015-11-24
申请号：US14045998
申请日：2013-10-04
Applicant: NGK SPARK PLUG CO., LTD.
Inventor： Daisuke Sumoyama , Tomonori Kanemaru
Abstract: In a spark plug, at least either of a center electrode and a ground electrode has a tip which defines a gap, a tip provided on at least either of a center electrode and a ground electrode contains Ir, Rh and Ru in a total amount of 95 mass % or more with respect to the whole mass amount thereof, and the contents (Rh, Ru) of Rh and Ru (mass %) lie within an area which is surrounded by a line which connects point A (6, 1), point B (6, 15), point C (33, 18), point D (33, 4) and the point A (6, 1) in this order or lie on the line. The tip satisfies 1.5≦Has/Han≦2.2.
Abstract translation: 在火花塞中，中心电极和接地电极中的至少一个具有限定间隙的尖端，设置在中心电极和接地电极中的至少一个上的尖端包含Ir，Rh和Ru的总量 相对于其整体质量为95质量％以上，Rh和Ru的含量（Rh，Ru）（质量％）位于被连接点A（6,1）， 点B（6,15），点C（33,18），点D（33,4）和点A（6,1）。 尖端满足1.5＆nlE; Has / Han＆nlE; 2.2。
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公开(公告)号：US10958045B2
公开(公告)日：2021-03-23
申请号：US16965752
申请日：2019-09-03
Applicant: NGK Spark Plug Co., Ltd.
Inventor： Daisuke Sumoyama , Kazuki Ito
Abstract: In a spark plug, a base material contains 50 mass % or more of Ni, 8 mass % or more and 40 mass % or less of Cr, 0.01 mass % or more and 2 mass % or less of Si, 0.01 mass % or more and 2 mass % or less of Al, 0.01 mass % or more and 2 mass % or less of Mn, 0.01 mass % or more and 0.1 mass % or less of C, and 0.001 mass % or more and 5 mass % or less of Fe. A discharge member contains at least Pt of a P group (Pt, Rh, Ir, and Ru) and Ni. The atomic concentration K of the P group of the discharge member, the atomic concentration L of the P group of the base material, the atomic concentration M of Ni of the discharge member, and the atomic concentration N of Ni of the base material satisfy (K+L)/(M+N)≤1.14.
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公开(公告)号：US10033163B1
公开(公告)日：2018-07-24
申请号：US15865788
申请日：2018-01-09
Applicant: NGK SPARK PLUG CO., LTD.
Inventor： Daisuke Sumoyama , Tatsuya Gozawa , Tsutomu Shibata
Abstract: A spark plug having a tip formed of an alloy containing Pt. The tip contains not less than 6 mass % of Rh, at least one element selected from an R group consisting of Rh, Re, Ir, Ru, W, Mo, and Nb, not less than 5 mass % of Ni, and at least one element selected from an N group consisting of Ni, Co, Fe, and Cu. The tip contains Rh most among the elements of the R group, and contains Ni most among the elements of the N group. The total of contents of Pt, Rh, and Ni is not less than 91 mass %, and the total of contents of Pt, the R group, and the N group is not less than 95 mass %. A value obtained by dividing the content of the R group by the content of the N group is not less than 0.7 and not greater than 8.
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公开(公告)号：US09948069B2
公开(公告)日：2018-04-17
申请号：US15102310
申请日：2014-12-16
Applicant: NGK SPARK PLUG CO., LTD.
Inventor： Masayuki Segawa , Daisuke Sumoyama
Abstract: A spark plug wherein least one of a center electrode and a ground electrode includes a shaft portion and an electrode tip joined to one surface of the shaft portion. The shaft portion includes a first core formed of a material containing copper and a first outer layer that is formed of a material having higher corrosion resistance than the first core and covers at least part of the first core. The electrode tip includes a second outer layer that is formed of a material containing a noble metal and forms the outer surface of the electrode tip and a second core that is formed of a material having a higher thermal conductivity than the second outer layer and is at least partially covered with the second outer layer.
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公开(公告)号：US09887519B1
公开(公告)日：2018-02-06
申请号：US15623817
申请日：2017-06-15
Applicant: NGK SPARK PLUG CO., LTD.
Inventor： Kazuki Ito , Daisuke Sumoyama , Tsutomu Shibata
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.
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Patent Agency Ranking
公开(公告)号：US09853423B1
公开(公告)日：2017-12-26
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
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.
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公开(公告)号：US10965104B2
公开(公告)日：2021-03-30
申请号：US16966093
申请日：2019-09-03
Applicant: NGK Spark Plug Co., Ltd.
Inventor： Daisuke Sumoyama , Kazuki Ito
Abstract: A spark plug capable of avoiding a discharge member bonded to a base material from peeling off easily is provided. The spark plug includes: a first electrode including a base material and a discharge member having at least a portion thereof bonded to the base material with a diffusing layer interposed therebetween; and a second electrode facing the discharge member with a spark gap interposed therebetween. The base material contains 50 mass % or more of Ni, 8 mass % or more and 40 mass % or less of Cr, 0.05 mass % or more and 2 mass % or less of Si, 0.01 mass % or more and 2 mass % or less of Al, 0.01 mass % or more and 2 mass % or less of Mn, 0.01 mass % or more and 0.1 mass % or less of C, and 0.001 mass % or more and 0.04 mass % or less of Fe.
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公开(公告)号：US10447014B1
公开(公告)日：2019-10-15
申请号：US16353294
申请日：2019-03-14
Applicant: NGK SPARK PLUG CO., LTD.
Inventor： Takaaki Kikai , Daisuke Sumoyama , Takuto Nakada
Abstract: A spark plug comprising: a first electrode including a tip containing 1r as a main material, and a base member to which the tip is joined; and a second electrode opposed to the tip with a spark gap therebetween. The number of crystal grains appearing in a range of 0.25 mm2 on an arbitrary cross-section of the tip in a first direction connecting the tip and the second electrode within the spark gap, is not less than 20. When a length of each of the crystal grains in the first direction is denoted by Y, and a length of each of the crystal grains in a second direction perpendicular to the first direction is denoted by X, 5 μm≤X≤100 μm and Y/X≥1.5 are satisfied.
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公开(公告)号：US09627857B2
公开(公告)日：2017-04-18
申请号：US15118954
申请日：2015-01-13
Applicant: NGK SPARK PLUG CO., LTD.
Inventor： Daisuke Sumoyama , Tomonori Kanemaru
CPC classification number: H01T13/39 , B22F3/16 , B22F2998/10 , C22C5/04 , C22C30/00 , C22C32/001 , C22C32/0031 , H01T13/20 , H01T13/32 , H01T21/02 , C22C1/1084 , B22F3/02 , B22F3/04 , B22F3/20 , B22F3/225 , B22F3/007 , B22F3/24
Abstract: An object of the present invention is to provide a spark plug which includes, at at least one of a center electrode and a ground electrode, a tip having excellent spark wear resistance in a high temperature environment, thereby having excellent durability. A spark plug includes a center electrode and a ground electrode disposed with a gap provided between the center electrode and the ground electrode. At least one of the center electrode and the ground electrode includes a tip which defines the gap. The tip includes a metal base material containing Ir as a main component, and oxide particles containing at least one of oxides having a perovskite structure represented by general formula ABO3 (A is at least one element selected from elements in group 2 in a periodic table, and B is at least one element selected from metal elements). When a cross section of the tip is observed, an area proportion of the oxide particles is not lower than 1% and not higher than 13%.
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公开(公告)号：US10312669B2
公开(公告)日：2019-06-04
申请号：US16072425
申请日：2016-10-17
Applicant: NGK SPARK PLUG CO., LTD.
Inventor： Daisuke Sumoyama , Tatsuya Gozawa , Tsutomu Shibata
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.
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