公开(公告)号：US20150340842A1

公开(公告)日：2015-11-26

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

IPC: H01T13/08 ,  H01T21/02 ,  H01T13/20

CPC classification number: H01T13/08 ,  H01T13/20 ,  H01T13/36 ,  H01T21/02

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。

公开(公告)号：US20190252864A1

公开(公告)日：2019-08-15

申请号：US16260909

申请日：2019-01-29

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Tsutomu KOBAYASHI

IPC: H01T13/32

Abstract: A spark plug includes a ground electrode and a center electrode, at least one of which includes an electrode body, an electrode tip, and a weld part formed therebetween. The weld part has an orthogonal projection on a virtual plane perpendicular to a layering direction of the electrode body and the electrode tip. The orthogonal projection includes projecting portions extending in a specific direction. The weld part satisfies a condition that a first line segment is shorter than a second line segment, wherein: the first line segment is a virtual line segment connecting peaks of adjacent two projecting portions; and the second line segment is a virtual line segment that is perpendicular to the first line segment and connects the first line segment to an outer periphery of the weld part at a point farthest from the first line segment.

公开(公告)号：US20160218487A1

公开(公告)日：2016-07-28

申请号：US15025675

申请日：2014-10-10

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Tsutomu KOBAYASHI ,  Keiji OZEKI

IPC: H01T13/20

CPC classification number: H01T13/20 ,  H01T13/36 ,  H01T13/40 ,  H01T13/58

Abstract: A packing is arranged between an outer-diameter-contracted portion of an insulator and an inner-diameter-contracted portion of a metal shell. In a contact portion of the packing and the insulator, a position at a most front end side is set as a first position. In a surface of a nose portion disposed at a front end side of the outer-diameter-contracted portion of the insulator, a position where a length from a front end of the insulator parallel to an axial line direction is 1 mm is set as a second position. A length between the first position and the second position parallel to the 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.

Abstract translation: 在绝缘体的外径缩小部分和金属壳的内径缩小部分之间布置有填料。 在密封件和绝缘体的接触部分中，将最前端侧的位置设定为第一位置。 在设置在绝缘体的外径缩小部分的前端侧的鼻部的表面中，将绝缘体前端与轴线方向平行的长度为1mm的位置设定为 第二名 将第一位置与平行于轴线方向的第二位置之间的长度设定为第一长度。 在垂直于轴线方向的载荷施加到第二位置的情况下，将作为绝缘体的表面上的位置的表面位置处的应力与在第一位置处的应力的应力比设定为应力比。 在应力比为0.8以上至1.15以下的表面位置的范围内，将从第一位置朝向与轴线方向平行的前端侧的连续范围内的长度设定为第二长度。 第二长度与第一长度的比率为0.7以上。

公开(公告)号：US20150295388A1

公开(公告)日：2015-10-15

申请号：US14437663

申请日：2013-06-13

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Tsutomu KOBAYASHI

IPC: H01T13/36 ,  H01T13/16

CPC classification number: H01T13/36 ,  H01T13/02 ,  H01T13/08 ,  H01T13/16 ,  H01T13/20

Abstract: An ignition plug includes a tubular ceramic insulator and a metallic shell having a protrusion protruding radially inward. The ceramic insulator has an engagement portion which is engaged with a receiving surface of the protrusion and an intermediate trunk portion extending rearward from the rear end of the engagement portion. A≦1.70 and B ≧1.20 are satisfied, where A is the thickness (mm) of the metallic shell along a direction which passes through the center of the receiving surface and is orthogonal to the axial line on a cross section including the axial line and B is the minimum thickness (mm) of the metallic shell 3 at the tube portion along the direction orthogonal to the axial line.

Abstract translation: 火花塞包括管状陶瓷绝缘体和具有径向向内突出的突起的金属壳。 陶瓷绝缘体具有与突起的接收表面接合的接合部分和从接合部分的后端向后延伸的中间主体部分。 A＆NlE; 1.70和B≥1.20，其中A是金属壳沿着穿过接收表面的中心的方向并且在包括轴线和横截面的横截面上与轴线正交的厚度（mm） B是沿着与轴线正交的方向的金属壳3在管部的最小厚度（mm）。

公开(公告)号：US20180366917A1

公开(公告)日：2018-12-20

申请号：US16060784

申请日：2016-08-05

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Keiji OZEKI ,  Tsutomu KOBAYASHI

IPC: H01T13/36 ,  H01T13/34

CPC classification number: H01T13/36 ,  H01T13/20 ,  H01T13/34

Abstract: A spark plug includes a tubular metal shell that includes a metal-shell step portion extending in an inner circumferential direction, an insulator that is inserted in the metal shell, that includes a facing portion that faces the metal-shell step portion with an annular packing interposed therebetween, a center electrode that extends in the axial direction, that has a flange portion extending in an outer circumferential direction, and a seal body seals the insulator and the center electrode. In a section that contains the axial line and that is along the axial line, a distance L along the axial line from a rear end of the facing portion of the insulator to a rear end of a portion at which the flange portion is in contact with the insulator satisfies L≤1.1 (mm).

公开(公告)号：US20180351332A1

公开(公告)日：2018-12-06

申请号：US15780430

申请日：2016-11-11

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Tsutomu KOBAYASHI

IPC: H01T13/34

CPC classification number: H01T13/34 ,  H01T13/20

Abstract: Disclosed is a spark plug capable of preventing electrode wear while ensuring impact resistance. In the spark plug, a conductive seal is arranged between a rear end portion of a center electrode and a resistor within an axial hole of an insulator. The conductive seal includes a side-surface seal layer brought into contact with the whole of a side surface of the rear end portion of the center electrode and having a thickness of 10 μm or larger in an axis perpendicular direction. Assuming that a projection area is defined by projecting the center electrode onto the axial hole in the axis perpendicular direction around a center axis of the spark plug, a contact surface of the resistor brought into contact with the axial hole overlaps at last a part of the projection area.

公开(公告)号：US20180123323A1

公开(公告)日：2018-05-03

申请号：US15561827

申请日：2016-03-28

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Tsutomu KOBAYASHI ,  Keiji OZEKI

IPC: H01T13/34 ,  H01T13/36

CPC classification number: H01T13/34 ,  H01T13/20 ,  H01T13/36

Abstract: A spark plug includes an insulator having an axial hole formed in a direction of an axis, a center electrode held in one end side of the axial hole, a metal terminal held in the other end side of the axial hole, an electrical connection part arranged to establish electrical connection between the center electrode and the metal terminal within the axial hole, and a metal shell disposed around an outer circumference of the insulator and having a thread portion formed on at least a part of an outer circumferential surface thereof. The electrical connection part has a resistor, and a conductive seal layer provided between the resistor and the center electrode to seal and fix the insulator and the center electrode together. In a half or more of a region in which the seal layer is provided in the direction of the axis, the spark plug satisfies predetermined conditions.

公开(公告)号：US20170033538A1

公开(公告)日：2017-02-02

申请号：US15302673

申请日：2015-03-03

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Tsutomu KOBAYASHI ,  Tomoyuki IGARASHI

IPC: H01T13/16 ,  H01T13/36

CPC classification number: H01T13/16 ,  H01T13/00 ,  H01T13/20 ,  H01T13/36

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.

Abstract translation: 符合2.8≤（A + B）/ M的关系的火花塞，其中A是在一个半部分中的片状填料和火花塞的金属壳之间的接触长度A1与接触长度A2的总和 在一个半部分中的片材填料和绝缘体之间，B是另一半部分中片状填料和金属壳之间的接触长度B1和片状填料与绝缘体之间的接触长度B 2的总和 在另一半部分。 M是从中间孔部的内径C减去凸缘的内径D而得到的差。