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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：US11476644B2
公开(公告)日：2022-10-18
申请号：US17413239
申请日：2020-04-27
Applicant: NGK SPARK PLUG CO., LTD.
Inventor： Shunsuke Tsuga , Keiji Ozeki
Abstract: The spark plug includes a cylindrical insulator, a center electrode provided in the insulator, and a cylindrical metal shell provided around the insulator. A ledge portion of the metal shell has a frontward facing surface facing a front side, a rearward facing surface facing a rear side, and a connection surface connecting the rearward facing surface and the frontward facing surface. The rearward facing surface engages with a step portion of the insulator. The metal shell includes a front cylindrical portion connected to the front side of the ledge portion. The inner circumferential surface of the front cylindrical portion is connected to the frontward facing surface of the ledge portion via a chamfered surface or a rounded surface. A corner at which the connection surface and the frontward facing surface are connected is located on the front side with respect to a front end of the insulator.
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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：US09660423B2
公开(公告)日：2017-05-23
申请号：US15109712
申请日：2015-01-13
Applicant: NGK SPARK PLUG CO., LTD.
Inventor： Keiji Ozeki
Abstract: It is an object to reduce eccentricity between a terminal nut and an insulator. A spark plug includes an insulator, a terminal nut, and a metallic shell. The outside diameter of the insulator at a rear end of the metallic shell is smaller than or equal to 8 mm, and the contact area between a flat portion of the insulator and a contact surface of the terminal nut is smaller than 10 mm2.
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公开(公告)号：US09620935B2
公开(公告)日：2017-04-11
申请号：US15025675
申请日：2014-10-10
Applicant: NGK SPARK PLUG CO., LTD.
Inventor： Tsutomu Kobayashi , Keiji Ozeki
Abstract: A packing between an insulator and a metal shell of a spark plug. A length between a first position of a contact portion of the packing and the insulator and a second position of a contact portion of the packing and the insulator parallel to an axial line direction is set as a first length. In the case where a load perpendicular to the axial line direction is applied to the second position, a ratio of stress at a surface position that is a position on a surface of the insulator to stress at the first position is set as a stress ratio. In a range of the surface position where the stress ratio is 0.8 or more to 1.15 or less, a length in a continuous range from the first position toward a front end side parallel to the axial line direction is set as a second length. A ratio of the second length to the first length is 0.7 or more.
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Patent Agency Ranking
公开(公告)号：US09225150B2
公开(公告)日：2015-12-29
申请号：US14412118
申请日：2013-07-16
Applicant: NGK Spark Plug Co., LTD.
Inventor： Masahiro Nishida , Tomoaki Kato , Keiji Ozeki , Naoyuki Mukouyama , Tsutomu Kobayashi
Abstract: A spark plug includes an insulator including an axial hole and having an outer periphery with a tapered outer face; a metal shell having a thread portion and a tapered inner face; and a circular packing sandwiched between the tapered outer face of the insulator and the tapered inner face of the metal shell. On at least one cross section including the axis, (A/B)≧3.1, B≧0.25, and (A+B)≦2.0 are satisfied, where A represents a length of (a difference between an effective diameter of the thread portion and an inner diameter at a rear end of the tapered inner face)/2, and B represents a length of (a difference between the inner diameter at the rear end of the tapered inner face and an inner diameter at a front end of the tapered inner face)/2.
Abstract translation: 火花塞包括：具有轴向孔的绝缘体，外周具有锥形的外表面; 具有螺纹部分和锥形内表面的金属壳体; 以及夹在绝缘体的锥形外表面和金属外壳的锥形内表面之间的圆形填料。 在包括轴线（A / B）≥3.1，B≥0.25和（A + B）＆nlE; 2.0）的至少一个横截面满足的情况下，其中A表示螺纹的有效直径之间的差 部分和锥形内表面后端的内径）/ 2，B表示锥形内表面的后端的内径与前端的内径之间的差 锥形内表面）/ 2。
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公开(公告)号：US20150188294A1
公开(公告)日：2015-07-02
申请号：US14412118
申请日：2013-07-16
Applicant: NGK Spark Plug Co., LTD.
Inventor： Masahiro Nishida , Tomoaki Kato , Keiji Ozeki , Naoyuki Mukouyama , Tsutomu Kobayashi
Abstract: A spark plug includes an insulator including an axial hole and having an outer periphery with a tapered outer face; a metal shell having a thread portion and a tapered inner face; and a circular packing sandwiched between the tapered outer face of the insulator and the tapered inner face of the metal shell. On at least one cross section including the axis, (A/B)≧3.1, B≧0.25, and (A+B)≦2.0 are satisfied, where A represents a length of (a difference between an effective diameter of the thread portion and an inner diameter at a rear end of the tapered inner face)/2, and B represents a length of (a difference between the inner diameter at the rear end of the tapered inner face and an inner diameter at a front end of the tapered inner face)/2.
Abstract translation: 火花塞包括：具有轴向孔的绝缘体，外周具有锥形的外表面; 具有螺纹部分和锥形内表面的金属壳体; 以及夹在绝缘体的锥形外表面和金属外壳的锥形内表面之间的圆形填料。 在包括轴线（A / B）≥3.1，B≥0.25和（A + B）＆nlE; 2.0）的至少一个横截面满足的情况下，其中A表示螺纹的有效直径之间的差 部分和锥形内表面后端的内径）/ 2，B表示锥形内表面的后端的内径与前端的内径之间的差 锥形内表面）/ 2。
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公开(公告)号：US10008834B2
公开(公告)日：2018-06-26
申请号：US15214505
申请日：2016-07-20
Applicant: NGK SPARK PLUG CO., LTD.
Inventor： Junji Kimura , Keiji Ozeki
Abstract: A method for manufacturing a spark plug comprising the steps of: placing an assembly of the center electrode, an insulator, and a metal shell in a pressure resistant vessel and determining whether or not the insulator has a defect by applying a voltage to the center electrode, and bending the ground electrode toward the center electrode after the defect inspection step, the defect inspection step being performed while a pressure in the pressure resistant vessel is changed to a plurality of different pressures.
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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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