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    SPARK PLUG
    4.
    发明公开
    SPARK PLUG 审中-公开

    公开(公告)号：EP2393172A4

    公开(公告)日：2013-12-11

    申请号：EP10735630

    申请日：2010-01-27

    申请人： NGK SPARK PLUG CO

    发明人： MIYASHITA NAOMICHI ,  MUSASA MAMORU ,  SUZUKI AKIRA ,  TORII KAZUYOSHI ,  KATO TOMOAKI

    IPC分类号： H01T13/32 ,  H01T13/39

    CPC分类号： H01T13/39 ,  H01T13/32

    摘要： The present invention provides a spark plug which is capable of suppressing a occurrence of crack and separation by determining a structural configuration of a melting portion formed in a junction portion between a discharge portion and a pedestal portion which form an ignition portion that protrudes from a ground electrode. In a profile line shape of a cross section including a center axis P of an ignition portion 80, an exposure surface 88 of a melting portion 83 connects a side surface 82 of a discharge portion 81 and a side surface 85 of a pedestal portion 84. Further, an exterior angle ¸ formed between an imaginary line Q, which passes through a boundary position X1 between the melting portion 83 and the pedestal portion 84 and a boundary position X2 between the melting portion 83 and the discharge portion 81, and the center axis P at a node C, satisfies 135° ‰¦ ¸ ‰¦ 175°. Furthermore, a proportion T/S of a forming depth T of the melting portion 83 to an outside diameter S of the discharge portion 81 satisfies T/S ‰§ 0.5.

    SPARK PLUG
    6.
    发明公开
    SPARK PLUG 审中-公开
    ZÜNDKERZE

    公开(公告)号：EP2555354A4

    公开(公告)日：2013-12-25

    申请号：EP11765208

    申请日：2011-03-28

    申请人： NGK SPARK PLUG CO

    发明人： YAMADA YUICHI ,  KUKI HIROAKI ,  MIYASHITA NAOMICHI ,  KYUNO JIRO

    IPC分类号： H01T13/36

    CPC分类号： H01T13/36

    摘要： [Objective] To provide a technique capable of improving breakage resistance of an insulator of a spark plug. [Means for Solution] In a cross-section including an axial line of a spark plug, the following relationship is satisfied: 0.6 mm

    摘要翻译： [目的]提供一种能够提高火花塞的绝缘体的耐破损性的技术。 [解决手段]在包括火花塞的轴线的截面中，满足以下关系：0.6mm < = L，其中，“A”表示绝缘体的支撑部分和相对于绝缘体的支撑部分形成在前端侧处的绝缘体主体部分之间的连接点，其中“B”表示靠近外部的位置 （a）绝缘体的支撑部分和填料彼此接触的接触部分的最内部位置和（b）绝缘体的支撑部分与虚拟直线的交点 平行于轴线并且从金属壳的台阶部分的最内圆周端部延伸，并且其中“L”表示从点“A”到点“B”的路径的长度沿着 绝缘子。

    SPARK PLUG
    8.
    发明公开
    SPARK PLUG 审中-公开

    公开(公告)号：EP2211433A4

    公开(公告)日：2014-06-18

    申请号：EP08850793

    申请日：2008-11-14

    申请人： NGK SPARK PLUG CO

    发明人： SUZUKI AKIRA ,  MIYASHITA NAOMICHI ,  TORII KAZUYOSHI

    IPC分类号： H01T13/32 ,  C22C5/04 ,  H01T13/39

    CPC分类号： H01T13/39 ,  C22C5/04

    摘要： An ignition part (80) of a ground electrode (30) includes a fused part (85) in which construction materials of a base portion (82) and a noble metal member (81) are fused and mixed by performing laser welding on the two. In the fused part (85), an average ratio P of components originated from the noble metal member (81) at points K1, L1, and M1 is equal to or greater than 80%, and an average ratio Q of components originated from the base portion at points K3, L3, and M3 is equal to or higher than 20%, and P+Q is equal to or higher than 160%. Accordingly, it is possible to obtain joining strength in the parts in the ignition part (80), thereby sufficiently preventing the generation of cracks, separation, and the like due to thermal stress.

    SPARK PLUG
    9.
    发明公开
    SPARK PLUG 审中-公开

    公开(公告)号：EP2479855A4

    公开(公告)日：2014-01-08

    申请号：EP11826542

    申请日：2011-08-08

    申请人： NGK SPARK PLUG CO

    发明人： SHIMAMURA TAKUYA ,  KATO TOMOAKI ,  KYUNO JIRO ,  MIYASHITA NAOMICHI

    IPC分类号： H01T13/36 ,  H01T13/20

    CPC分类号： H01T13/36

    摘要： Disclosed is a spark plug having an insulator capable of achieving good breakage resistance by modifying the state of contact of the insulator with a plate packing and the like without increase in insulator thickness. A spark plug 1 contains a ceramic insulator 2, a plate packing 22 and a metal shell 3. The ceramic insulator 2 has, on an outer circumferential surface thereof, a step portion 14 having an outer diameter decreasing toward the front in the direction of an axis CL1 and a leg portion 13 extending toward the front in the direction of the axis CL1. The metal shell 3 has, on an inner circumferential surface thereof, a taper portion 21 having an inner diameter decreasing toward the front in the direction of the axis CL1. The ceramic insulator 2 is fixed in the metal shell 3 with the step portion 14 retained on the taper portion 21 via the plate packing 22. The ceramic insulator 2 also has a curved surface portion 31 formed into a concave shape on the outer circumferential surface thereof at a position between the step portion 14 and the leg portion 13. Herein, 50% or more of an inner circumferential edge portion IP of the plate packing 22 in a circumferential direction thereof is in contact with a part of the ceramic insulator 2 located front of a middle region CP of the curved surface portion 31.