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公开(公告)号：US10186844B2
公开(公告)日：2019-01-22
申请号：US15302673
申请日：2015-03-03
Applicant: NGK SPARK PLUG CO., LTD.
Inventor： Tsutomu Kobayashi , Tomoyuki Igarashi
Abstract: A spark plug that satisfies the relation 2.8≤(A+B)/M, where A is the sum of a length A1 of contact between a sheet packing and a metallic shell of a spark plug in one half section and a length A2 of contact between the sheet packing and the insulator in the one half section, and B is the sum of a length B1 of contact between the sheet packing and the metallic shell in the other half section and a length B2 of contact between the sheet packing and the insulator in the other half section. M is the difference obtained by subtracting the inner diameter D of a ledge from the inner diameter C of a middle hole portion.
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Patent Agency Ranking
公开(公告)号：US09735552B2
公开(公告)日：2017-08-15
申请号：US14538262
申请日：2014-11-11
Applicant: NGK Spark Plug Co., LTD.
Inventor： Tatsunori Yamada , Yusuke Fuji , Tomoyuki Igarashi , Kei Takahashi
IPC: H01T13/32
CPC classification number: H01T13/32
Abstract: A spark plug includes: an insulator having an axial hole; a conductive member disposed around the insulator; a center electrode disposed inside the axial hole, having a bar shape extending in the axial direction, and located on a rear end side with respect to a front end of the conductive member; a ground electrode forming a spark gap between the ground electrode and the center electrode; and a connection part including a plurality of spokes extending in a radial direction whose inner ends are connected to the ground electrode, and connecting the conductive member to the ground electrode. The connection part includes a joint part that is jointed to an inner surface of the conductive member, and the ground electrode has at least one of a notch and a groove at a position that is different from a position connected to the spokes in a circumferential direction.
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公开(公告)号：US20140175967A1
公开(公告)日：2014-06-26
申请号：US14235824
申请日：2012-06-08
Applicant: NGK SPARK PLUG CO., LTD.
Inventor： Tomoyuki Igarashi , Ryuichi Ohno , Tatsunori Yamada , Katsutoshi Nakayama
IPC: H01T13/16
Abstract: A spark plug has a center electrode having an electrode base member and a core material which is disposed in the electrode base member and which predominantly contains copper, and a noble metal tip disposed at a forward end of the center electrode, and a fusion portion formed between the noble metal tip, and the electrode base member and the core material. The fusion portion is in contact with the core material in a cross section which is parallel to the center axis of the center electrode and which passes through the center axis and the fusion portion. The fusion portion contains a component of the noble metal tip, a component of the electrode base member, and a copper component forming the core material.
Abstract translation: 火花塞具有中心电极，该中心电极具有设置在电极基体中并且主要包含铜的电极基体和芯材，以及设置在中心电极前端的贵金属电极头和形成的熔融部分 在贵金属端头与电极基体和芯材之间。 熔接部与芯材以与中心电极的中心轴平行且穿过中心轴和熔融部的横截面接触。 熔融部包含贵金属电极头的成分，电极基体的成分和形成芯材的铜成分。
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公开(公告)号：US10340666B2
公开(公告)日：2019-07-02
申请号：US15444857
申请日：2017-02-28
Applicant: NGK SPARK PLUG CO., LTD.
Inventor： Tomoyuki Igarashi
Abstract: A spark plug having a noble metal tip that is joined to a tip-joining surface of a ground electrode so as to face an end face of a center electrode. When the noble metal tip is projected onto a projection plane parallel to the tip-joining surface, the noble metal tip has an elliptical shape in the projection plane. When the ground electrode is also projected onto the projection plane, an angle of 45° or less is formed between the major axis of the elliptical shape in the projection plane and a straight line extending in the lengthwise direction of the ground electrode and passing through the center of the noble metal tip in the projection plane.
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公开(公告)号：US10283941B2
公开(公告)日：2019-05-07
申请号：US15773009
申请日：2016-10-11
Applicant: NGK SPARK PLUG CO., LTD.
Inventor： Tomoyuki Igarashi
Abstract: An electrode of the spark plug includes a first melt portion formed between a body portion of an intermediate member and a noble metal tip; and a second melt portion that is formed, between a flange portion of the intermediate member and an electrode base material, at least at a position of intersection with an axial line of the noble metal tip. In a cross section including the axial line of the noble metal tip, when: a diameter of the noble metal tip is denoted by Tw; the shortest distance between the second melt portion and a boundary between the first melt portion and the intermediate member is denoted by S1; and the longest distance between the second melt portion and the boundary between the first melt portion and the intermediate member is denoted by S2, 1.0 mm≤Tw≤1.2 mm and (S2−S1)≤0.3 mm are met.
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6.发明授权公开(公告)号：US09083155B2
公开(公告)日：2015-07-14
申请号：US14011215
申请日：2013-08-27
Applicant: NGK SPARK PLUG CO., LTD.
Inventor： Hirotoshi Yoshizaki , Tomoyuki Igarashi
Abstract: A spark plug where a predetermined cross section of a noble metal tip is divided by a vertical line into two half cross sections having a first half cross section and a second half cross section. The first half cross section satisfies h1/t≦0.2 and Rw1/Rt1≧1.03, and the second half cross section satisfies h2/t≦0.2 and Rw2/Rt2≧1.03. At a welding interface, an oxidation scale progresses in a direction away from an axis along side surfaces and changes the progressing direction at the end points so as to progress in a direction toward the axis along bottom surfaces. The progress of the oxidation scale is restrained. Since the noble metal tip is held by an engagement portion of a ground electrode, separation of the noble metal tip from the ground electrode 40 can be restrained.
Abstract translation: 一种火花塞，其中贵金属电极头的预定横截面被垂直线划分为具有第一半截面和第二半截面的两个半截面。 第一半截面满足h1 / t＆nlE; 0.2和Rw1 /Rt1≥1.03，第二半截面满足h2 / t＆nlE; 0.2和Rw2 /Rt2≥1.03。 在焊接界面处，氧化刻度沿着沿着侧面的轴线的方向前进，并且在端点处改变前进方向，以沿着沿着底面的轴线方向前进。 氧化垢的进展受到限制。 由于贵金属端头被接地电极的接合部分保持，所以可以抑制贵金属电极头与接地电极40的分离。
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