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公开(公告)号：US20180019578A1
公开(公告)日：2018-01-18
申请号：US15630224
申请日：2017-06-22
发明人： Naoyuki MUKOYAMA , Hiroyuki KAMEDA
CPC分类号： H01T13/32 , H01T13/08 , H01T13/16 , H01T13/20 , H01T13/34 , H01T13/36 , H01T13/38 , H01T13/39 , H01T13/41
摘要： 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：US20180038337A1
公开(公告)日：2018-02-08
申请号：US15552205
申请日：2016-02-03
摘要： A plasma jet plug includes: a tubular insulator having an axial hole; a center electrode disposed inside the axial hole; metal shell disposed on an outer circumference of the insulator; and an orifice electrode electrically connected to the metal shell and disposed on a front side of the insulator. A plasma generating cavity is formed by a surface of the center electrode, an inner surface of the insulator, and an inner surface of the orifice electrode. In the plasma jet plug, a shortest path length D1 of a surface path is greater than or equal to 5 times an aerial gap G, where the surface path extends, inside the cavity, from a surface of the center electrode via an inner surface of the insulator to an inner surface of the orifice electrode, and the aerial gap G is a shortest distance between the center electrode and the orifice electrode.
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公开(公告)号：US20170358905A1
公开(公告)日：2017-12-14
申请号：US15492242
申请日：2017-04-20
摘要： 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：US20150340842A1
公开(公告)日：2015-11-26
申请号：US14412076
申请日：2013-07-16
发明人： Keiji OZEKI , Tomoaki KATO , Naoyuki MUKOYAMA , Tsutomu KOBAYASHI
摘要： 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.
摘要翻译： 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：US20180287350A1
公开(公告)日：2018-10-04
申请号：US15927533
申请日：2018-03-21
发明人： Hirotaka SAITO , Naoyuki MUKOYAMA
摘要： 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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公开(公告)号：US20160028214A1
公开(公告)日：2016-01-28
申请号：US14811160
申请日：2015-07-28
IPC分类号： H01T13/32
摘要： 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.
摘要翻译： 等离子体喷射塞具有由中心电极的表面，绝缘体的内表面和接地电极的表面限定的空腔。 当中心电极的前部前侧的空腔的一部分的体积是第一容积V1，并且中心电极的前端的后侧的空腔的一部分的体积是第二容积 体积V2，满足以下表达式：V1 /V2≥0.20。
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