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公开(公告)号：US20220294191A1
公开(公告)日：2022-09-15
申请号：US17668796
申请日：2022-02-10
Applicant: NGK Spark Plug Co., Ltd.
Inventor： Tatsuya GOZAWA , Shunsuke MAEDA , Daiki GOTO
Abstract: A spark plug includes a tubular metal shell; an insulator including a locking portion locked onto the metal shell; and a cap disposed at a front end side of the metal shell, the cap having a plurality of orifices. The plurality of orifices include orifices with different cross-sectional areas. A sum of the number of one or more largest orifices and the number of one or more large orifices that have a cross-sectional area of larger than or equal to 90% of the one or more largest orifices is smaller than the number of orifices that are other than the one or more largest orifices and the one or more large orifices. A length of the front end portion in an axial direction between a front end of the insulator and a front end of the locking portion is smaller than or equal to 12 mm.
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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
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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公开(公告)号：US20230143447A1
公开(公告)日：2023-05-11
申请号：US17915303
申请日：2020-11-16
Applicant: NGK SPARK PLUG CO., LTD.
Inventor： Tatsuya GOZAWA
Abstract: A spark plug includes a metallic shell which holds a center electrode in an insulated condition, and a ground electrode is held in a penetration hole of the metallic shell. The penetration hole includes a circular counterbore portion, and a penetrating portion extending from the counterbore portion to an inner circumferential surface of the metallic shell. The ground electrode includes a fixing portion which is fixed to the counterbore portion, and an extension portion extending from the fixing portion. The extension portion has a flat surface which faces a forward end surface of the center electrode in the axial direction. The penetrating portion restricts the extension portion such that the flat surface of the extension portion faces toward a rear end side in the axial direction.
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公开(公告)号：US20210399532A1
公开(公告)日：2021-12-23
申请号：US17292898
申请日：2020-04-27
Applicant: NGK SPARK PLUG CO., LTD.
Inventor： Kenji BAN , Tatsuya GOZAWA
Abstract: A spark plug capable of generating a sufficient volume of jet with an increased range is provided. The spark plug includes a metal shell having a tubular shape; a center electrode retained in the metal shell in an insulated manner; a ground electrode that is electrically connected to the metal shell and that defines a spark gap between the center electrode and an end portion of the ground electrode; and a cap portion that covers the center electrode and the end portion of the ground electrode from the front in a region in front of the metal shell and in which a through hole is formed. The cap portion includes a plurality of projections on an inner surface of the through hole. The projections extend in an extending direction in which the through hole extends.
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公开(公告)号：US20200287358A1
公开(公告)日：2020-09-10
申请号：US16801497
申请日：2020-02-26
Applicant: NGK SPARK PLUG CO., LTD.
Inventor： Tatsuya GOZAWA , Kenji BAN
IPC: H01T13/16
Abstract: A spark plug that can suppress pre-ignition of a combustible air-fuel mixture that has flowed into the sub-chamber. The spark plug includes a ground electrode that joins to a metal shell and forms a spark gap; and a cap member that covers a center electrode and the ground electrode and forms a sub-chamber. A first fused portion that joins the metal shell and the cap member is located on the front-end side relative to the spark gap. At least a part of a first facing portion at which the metal shell and the cap member face each other is located on the sub-chamber side relative to the first fused portion. The first fused portion is not formed in an inner peripheral surface of the metal shell and an inner peripheral surface of the cap member.
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Patent Agency Ranking
公开(公告)号：US20220360051A1
公开(公告)日：2022-11-10
申请号：US17425522
申请日：2020-11-19
Applicant: NGK SPARK PLUG CO., LTD.
Inventor： Kenji BAN , Tatsuya GOZAWA
Abstract: A spark plug includes a center electrode, a tubular metallic shell which holds the center electrode therein in an insulated state, and a ground electrode which faces a forward end portion of the center electrode. The metallic shell has a penetration hole which penetrates the metallic shell in a direction intersecting an axial direction. The ground electrode has a press-fitted portion inserted into the penetration hole and fixed to the metallic shell, a projecting portion projecting toward an inner side of the metallic shell, and an insertion portion disposed between the press-fitted portion and the projecting portion, inserted into the penetration hole, and forming a space between the insertion portion and an inner surface of the penetration hole. An angle α formed between the inner surface of the penetration hole and an outer surface of the insertion portion falls within a range of 0°
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公开(公告)号：US20200295540A1
公开(公告)日：2020-09-17
申请号：US16815390
申请日：2020-03-11
Applicant: NGK SPARK PLUG CO., LTD.
Inventor： Kenji BAN , Tatsuya GOZAWA
Abstract: A spark plug includes a plug cap having a plurality of through holes. In a cross section including an axial line, the plug cap includes an enlarging portion in a portion of a region between a first imaginary straight line and a second imaginary straight line, the first imaginary straight line extending through a front end of the end portion of a ground electrode and being perpendicular to the axial line, the second imaginary straight line extending through a back end of one of inner open ends of the through holes that is closest to a front end of the spark plug and being perpendicular to the axial line. The enlarging portion being a portion in which a minimum distance from an outer surface to an inner surface of the plug cap increases with increasing distance in a direction from back to front.
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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
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。
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公开(公告)号：US20210359495A1
公开(公告)日：2021-11-18
申请号：US17283203
申请日：2020-06-23
Applicant: NGK SPARK PLUG CO., LTD.
Inventor： Kenji BAN , Tatsuya GOZAWA
IPC: H01T13/54
Abstract: A spark plug includes a metal shell and a cap member joined to the metal shell to define a pre-chamber. The cap member includes an overlapping surface that overlaps the metal shell along the axial line direction, an inner facing surface positioned closer to the pre-chamber than is the overlapping surface, the inner facing surface facing the metal shell in the axial line direction, and an outer facing surface positioned closer to an outer periphery than is the overlapping surface, the outer facing surface facing the metal shell in the axial line direction. A portion of the cap member that is closer to the pre-chamber than is the overlapping surface s spaced from the metal shell. The metal shell and the cap member are joined together at at least one of the outer facing surface and the overlapping surface.
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公开(公告)号：US20200335949A1
公开(公告)日：2020-10-22
申请号：US16814126
申请日：2020-03-10
Applicant: NGK SPARK PLUG CO., LTD.
Inventor： Tatsuya GOZAWA , Kenji BAN , Daiki GOTO
Abstract: A spark plug having excellent ignitability including a rod-shaped center electrode; a ground electrode that includes a facing portion facing a front end portion of the center electrode and forms a discharge gap between the facing portion and the front end portion of the center electrode; an insulator; a metal shell; and a cover portion that covers, from a front end side of the spark plug, the front end portion of the center electrode and the facing portion of the ground electrode to form a pre-chamber and includes injection holes that are through holes.
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