公开(公告)号：US20180323584A1

公开(公告)日：2018-11-08

申请号：US15773009

申请日：2016-10-11

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Tomoyuki IGARASHI

IPC: H01T13/39 ,  H01T13/32 ,  H01T13/34 ,  H01T13/38

CPC classification number: H01T13/39 ,  H01T13/20 ,  H01T13/32 ,  H01T13/34 ,  H01T13/38

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.

公开(公告)号：US20170256916A1

公开(公告)日：2017-09-07

申请号：US15444857

申请日：2017-02-28

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Tomoyuki IGARASHI

IPC: H01T13/32 ,  H01T13/39

CPC classification number: H01T13/32 ,  H01T13/39

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.

公开(公告)号：US20150162725A1

公开(公告)日：2015-06-11

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.

Abstract translation: 火花塞包括：具有轴向孔的绝缘体; 设置在所述绝缘体周围的导电构件; 设置在所述轴向孔内的中心电极，所述中心电极具有沿轴向延伸的杆状，并且相对于所述导电构件的前端位于后端侧; 在接地电极和中心电极之间形成火花隙的接地电极; 以及连接部，其包括在其内端与接地电极连接的径向延伸的多个辐条，并且将导电部件连接到接地电极。 连接部包括与导电部件的内表面接合的接合部，并且接地电极具有与沿着圆周方向连接到辐条的位置不同的位置的凹口和凹槽中的至少一个 。

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。

公开(公告)号：US20140062284A1

公开(公告)日：2014-03-06

申请号：US14011215

申请日：2013-08-27

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Hirotoshi YOSHIZAKI ,  Tomoyuki IGARASHI

IPC: H01T13/39

CPC classification number: H01T13/39 ,  H01T13/32 ,  H01T21/02 ,  H01T21/06

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。 前半部分满足h1/t@0.2和Rw1 / Rt1> = 1.03，第二半截面满足h2/t@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。