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公开(公告)号：US20150188293A1
公开(公告)日：2015-07-02
申请号：US14409840
申请日：2013-05-07
Applicant: NGK Spark Plug Co., LTD.
Inventor： Keiji Ozeki , Tomoaki Kato , Naoyuki Mukoyama
IPC: H01T13/36
CPC classification number: H01T13/36
Abstract: A spark plug includes a center electrode, an insulator, a metallic shell, and a seal member for providing a seal between the insulator and the metallic shell. The insulator includes a first portion, a second portion located axially forward of the first portion and being smaller than the first portion, and an insulator first-diameter-reducing-portion whose outside diameter reduces forward and which connects the first portion and the second portion. The metallic shell includes a protrusion that includes a metallic shell diameter-reducing-portion whose inside diameter reduces forward. The seal member is disposed between the insulator first-diameter-reducing-portion and the metallic shell diameter-reducing-portion. A relationship θ21>θ22 is satisfied, where the angle θ21 is an angle between a straight line orthogonal to the axial line and the outline of the metallic shell diameter-reducing-portion, and the angle θ22 is an angle between the straight line and an outline of the insulator first-diameter-reducing-portion.
Abstract translation: 火花塞包括中心电极，绝缘体，金属壳和用于在绝缘体和金属壳之间提供密封的密封构件。 所述绝缘体包括第一部分，位于所述第一部分的轴向前方并且小于所述第一部分的第二部分，以及外径向前减小并且连接所述第一部分和所述第二部分的绝缘体第一直径减小部分 。 金属外壳包括一个突起，该突起包括内径减小的金属壳直径减小部分。 密封构件设置在绝缘体第一直径减小部分和金属壳直径减小部分之间。 满足以下条件之一的关系和理论：21>＆thetas; 22，其中角度和角度; 21是与轴线正交的直线与金属壳直径减小部分的轮廓之间的角度以及角度和角度; 22 直线与绝缘体第一直径减小部分的轮廓之间的角度。
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公开(公告)号：US09306375B2
公开(公告)日：2016-04-05
申请号：US14409840
申请日：2013-05-07
Applicant: NGK Spark Plug Co., LTD.
Inventor： Keiji Ozeki , Tomoaki Kato , Naoyuki Mukoyama
IPC: H01T13/36
CPC classification number: H01T13/36
Abstract: A spark plug includes a center electrode, an insulator, a metallic shell, and a seal member for providing a seal between the insulator and the metallic shell. The insulator includes a first portion, a second portion located axially forward of the first portion and being smaller than the first portion, and an insulator first-diameter-reducing-portion whose outside diameter reduces forward and which connects the first portion and the second portion. The metallic shell includes a protrusion that includes a metallic shell diameter-reducing-portion whose inside diameter reduces forward. The seal member is disposed between the insulator first-diameter-reducing-portion and the metallic shell diameter-reducing-portion. A relationship θ21>θ22 is satisfied, where the angle θ21 is an angle between a straight line orthogonal to the axial line and the outline of the metallic shell diameter-reducing-portion, and the angle θ22 is an angle between the straight line and an outline of the insulator first-diameter-reducing-portion.
Abstract translation: 火花塞包括中心电极，绝缘体，金属壳和用于在绝缘体和金属壳之间提供密封的密封构件。 所述绝缘体包括第一部分，位于所述第一部分的轴向前方并且小于所述第一部分的第二部分，以及外径向前减小并且连接所述第一部分和所述第二部分的绝缘体第一直径减小部分 。 金属外壳包括一个突起，该突起包括内径减小的金属壳直径减小部分。 密封构件设置在绝缘体第一直径减小部分和金属壳直径减小部分之间。 满足以下条件之一的关系和理论：21>＆thetas; 22，其中角度和角度; 21是与轴线正交的直线与金属壳直径减小部分的轮廓之间的角度以及角度和角度; 22 直线与绝缘体第一直径减小部分的轮廓之间的角度。
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公开(公告)号：US20140084776A1
公开(公告)日：2014-03-27
申请号：US14034610
申请日：2013-09-24
Applicant: NGK SPARK PLUG CO., LTD.
Inventor： Keiji Ozeki , Naoyuki Mukoyama
IPC: H01T13/36
CPC classification number: H01T13/36
Abstract: A spark plug includes an insulator, and a metal shell disposed at an outer periphery of the insulator and including a shoulder. The insulator includes a trunk portion, and a leg formed at the tip end side of the trunk portion. The shoulder of the metal shell includes a first shoulder, and a second shoulder formed at the tip end side of the first shoulder. A distance Da between the tip end of the second shoulder and the leg and a distance Db between the tip end of the trunk portion and the second shoulder satisfy a relationship of Da/Db≧1.1. A distance T between the rear end of the first shoulder and the tip end of the second shoulder and a distance L between the rear end of the first shoulder and a tip end face of the metal shell satisfy a relationship of T/L≦0.5.
Abstract translation: 火花塞包括绝缘体和设置在绝缘体的外周并包括肩部的金属壳。 绝缘体包括主干部分和形成在主干部分的顶端侧的腿部。 金属壳的肩部包括形成在第一肩部的顶端侧的第一肩部和第二肩部。 第二肩部的前端与腿部之间的距离Da与躯体部分的前端与第二肩部之间的距离Db满足Da /Db≥1.1的关系。 第一肩部的后端与第二肩部的前端之间的距离T与第一肩部的后端与金属外壳的前端面之间的距离L满足T / L＆lt; llE; 0.5的关系。
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公开(公告)号：US10090648B1
公开(公告)日：2018-10-02
申请号：US15927533
申请日：2018-03-21
Applicant: NGK SPARK PLUG CO., LTD.
Inventor： Hirotaka Saito , Naoyuki Mukoyama
Abstract: A spark plug including a bottomed tubular insulator, a tubular metal shell, a conductive layer, and a terminal. The insulator extends along an axial line from a front end side to a rear end side and is closed at a front end. The metal shell has a ledge portion that projects radially inward and locks the insulator from the front end side. The metal shell holds the insulator from an outer peripheral side. The conductive layer covers at least a part of an inner peripheral surface of a portion of the insulator which is located on the front end side with respect to a locking portion locked by the ledge portion. The terminal is electrically connected to the conductive layer and is insulated from the metal shell.
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Patent Agency Ranking
公开(公告)号：US09478947B2
公开(公告)日：2016-10-25
申请号：US14811160
申请日：2015-07-28
Applicant: NGK Spark Plug Co., LTD.
Inventor： Naoyuki Mukoyama , Hiroyuki Kameda , Daisuke Kasahara
Abstract: A plasma jet plug has a cavity defined by a surface of a center electrode, an inner surface of an insulator, and a surface of a ground electrode. When a volume of a portion of the cavity on a front side of a front portion of the center electrode is a first volume V1 and a volume of a portion of the cavity on a rear side of the front end of the center electrode is a second volume V2, the following expression is satisfied: V1/V2≧0.20.
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公开(公告)号：US09276383B2
公开(公告)日：2016-03-01
申请号：US14412076
申请日：2013-07-16
Applicant: NGK Spark Plug Co., LTD.
Inventor： Keiji Ozeki , Tomoaki Kato , Naoyuki Mukoyama , Tsutomu Kobayashi
Abstract: A spark plug includes a ceramic insulator having an engagement portion, and a metallic shell provided around the ceramic insulator and having a protrusion. The protrusion has a diameter-decreasing portion, which seats on the engagement portion via an annular seat packing. On a cross section including an axial line, θs>θp is satisfied, where θp represents an acute angle (°) between a straight line orthogonal to the axial line and the contour of the engagement portion, and θs represents an acute angle (°) between a straight line orthogonal to the axial line and the contour of the diameter-decreasing portion. In the aforementioned cross section, Hvo>Hvi is satisfied, where Hvo represents the Vickers hardness (Hv) of the seat packing at the midpoint of a first line segment, and Hvi represents the Vickers hardness (Hv) of the seat packing at the midpoint of a second line segment.
Abstract translation: 火花塞包括具有接合部分的陶瓷绝缘体和设置在陶瓷绝缘体周围并具有突出部的金属壳。 该突起具有直径减小部分，该直径减小部分经由环形座垫料位于接合部分上。 在包括轴线的横截面上，对于所述轴线与所述轴线的轮廓之间的锐角（θ）和所述轴线之间的角度（°），p表示满足; s表示与轴线正交的直线与直径减小部的轮廓之间的锐角（°）。 在上述横截面中，Hvo> Hvi满足，其中Hvo表示在第一线段的中点处的座椅密封件的维氏硬度（Hv），Hvi表示座垫在中点处的维氏硬度（Hv） 的第二线段。
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公开(公告)号：US10153618B2
公开(公告)日：2018-12-11
申请号：US15630224
申请日：2017-06-22
Applicant: NGK SPARK PLUG CO., LTD.
Inventor： Naoyuki Mukoyama , Hiroyuki Kameda
IPC: H01T13/32 , H01T13/08 , H01T13/38 , H01T13/39 , H01T13/16 , H01T13/20 , H01T13/34 , H01T13/36 , H01T13/41
Abstract: A spark plug having an insulator with a front end portion having an annular groove opened to a front side around an axial line. The groove has a width of greater than or equal to 0.2 mm in a radial direction. In a cross section including the axial line, a value D/L obtained by dividing, by a length L, a creepage distance D, from a position P on the frontmost side of a region in which a clearance distance between an outer surface of a front end portion and an inner circumferential surface of a metal shell is less than or equal to 0.1 mm to a connection position between an outer surface of the front end portion and the axial hole, is greater than or equal to 1.1.
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公开(公告)号：US09979162B2
公开(公告)日：2018-05-22
申请号：US15492242
申请日：2017-04-20
Applicant: NGK Spark Plug Co., LTD.
Inventor： Daisuke Kasahara , Yuichi Yamada , Naoyuki Mukoyama
Abstract: A plasma jet plug includes a rod-shaped central electrode, an insulator having an axial hole, a metal shell disposed around the insulator, an orifice electrode electrically connected to the metal shell and located at a distal end side of the insulator, and a gasket that contacts an outer surface of the insulator and an inner surface of the metal shell. The insulator includes a first member, a second member and an inorganic seal layer. The first member has the axial hole and includes a large-diameter portion and a small-diameter portion. The second member has a through hole into which the small-diameter portion is inserted. The second member has an outer surface that contacts the gasket. The inorganic seal layer seals a gap between the first member and the second member. In a section including the axis, the sum of seal lengths is greater than or equal to 3 mm.
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公开(公告)号：US08791627B2
公开(公告)日：2014-07-29
申请号：US14034610
申请日：2013-09-24
Applicant: NGK Spark Plug Co., Ltd.
Inventor： Keiji Ozeki , Naoyuki Mukoyama
CPC classification number: H01T13/36
Abstract: A spark plug includes an insulator, and a metal shell disposed at an outer periphery of the insulator and including a shoulder. The insulator includes a trunk portion, and a leg formed at the tip end side of the trunk portion. The shoulder of the metal shell includes a first shoulder, and a second shoulder formed at the tip end side of the first shoulder. A distance Da between the tip end of the second shoulder and the leg and a distance Db between the tip end of the trunk portion and the second shoulder satisfy a relationship of Da/Db≧1.1. A distance T between the rear end of the first shoulder and the tip end of the second shoulder and a distance L between the rear end of the first shoulder and a tip end face of the metal shell satisfy a relationship of T/L≦0.5.
Abstract translation: 火花塞包括绝缘体和设置在绝缘体的外周并包括肩部的金属壳。 绝缘体包括主干部分和形成在主干部分的顶端侧的腿部。 金属壳的肩部包括形成在第一肩部的顶端侧的第一肩部和第二肩部。 第二肩部的前端与腿部之间的距离Da与躯体部分的前端与第二肩部之间的距离Db满足Da /Db≥1.1的关系。 第一肩部的后端与第二肩部的前端之间的距离T与第一肩部的后端与金属外壳的前端面之间的距离L满足T / L＆lt; llE; 0.5的关系。
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