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    Spark plug
    3.
    发明公开
    Spark plug 有权
    火花塞

    公开(公告)号：EP2738891A1

    公开(公告)日：2014-06-04

    申请号：EP14000724.6

    申请日：2008-11-20

    申请人： NGK Spark Plug Co., Ltd.

    发明人： Hiroyuki, Kameda

    IPC分类号： H01T13/32 ,  H01T13/20 ,  H01T21/02 ,  H01T13/39

    CPC分类号： H01T13/39 ,  H01T13/32 ,  H01T21/02

    摘要： A corner of a distal end of a ground-electrode-side noble metal tip of a spark plug is taken as a first corner; a corner of a leading end of a center-electrode-side noble metal tip is taken as a second corner; a corner formed at a starting point where a diameter of the center electrode is reduced is taken as a third corner; a corner of the ground electrode is taken as a fourth corner; a corner closest to the third corner of the corners on the distal end of the ground-electrode-side noble metal tip is taken as a fifth corner; a length of a virtual flying spark path defined between the first corner and the second corner is taken as L1; a length of a virtual flying spark path defined between the third corner and the fourth corner is taken as L2; a length of a virtual flying spark path defined between the third corner and the fifth corner is taken as L3; and L2 or L3, whichever is shorter, is taken as L4, the spark plug fulfills a relational expression of L4/L1 ≥ 0.9.

    摘要翻译： 将火花塞的接地电极侧贵金属电极头的末端的拐角作为第一拐角; 将中心电极侧贵金属电极头的前端的角部作为第二角部， 将形成于中心电极直径缩小的起始点的拐角作为第三拐角; 接地电极的一角作为第四角; 将最靠近接地电极侧贵金属电极头远端拐角的第三拐角的拐角作为第五拐角; 定义在第一角部和第二角部之间的虚拟飞火路径的长度被取为L1; 定义在第三角部和第四角部之间的虚拟飞火路径的长度被取为L2; 定义在第三角部和第五角部之间的虚拟飞火路径的长度被取为L3; L2或L3中较小者取L4时，火花塞满足L4 /L1≥0.9的关系式。

    Spark plug
    4.
    发明公开
    Spark plug 有权
    火花塞

    公开(公告)号：EP1926189A1

    公开(公告)日：2008-05-28

    申请号：EP07022788.9

    申请日：2007-11-23

    申请人： NGK Spark Plug Co., Ltd.

    发明人： Kaori, Kishimoto ,  Katsutoshi, Nakayama ,  Hiroyuki, Kameda ,  Yasushi, Sakakura

    IPC分类号： H01T13/32

    CPC分类号： H01T13/32

    摘要： To provide a spark plug including a ground electrode which has an excellent heat sinking ability.
    A ground electrode 30 includes a core material 35 therein. In a front end portion 31 of the ground electrode 30, a segment BFGHE assumes a generally "M" shape and forms a part of an outline of the core material 35 defined by projecting the core material 35 onto an inner face 33 which is located opposed to a center electrode. Since the outline of the core material 35 assuming such a shape extends close to an outer circumference face of the ground electrode 30 on the further front end side of the front end portion 31, heat received from a combustion chamber during a drive of an internal-combustion engine can be conducted to the core material 35 from a position close to the outer circumference face on the further front end side of the ground electrode 30. As a result, more effective heat sinking ability can be achieved.

    摘要翻译： 提供一种具有散热性优异的接地电极的火花塞。 接地电极30中包括芯材35。 在接地电极30的前端部分31中，段BFGHE呈现大致“M”形并且形成芯材35的轮廓的一部分，芯材35通过将芯材35投影到位于相对的内表面33上 到中心电极。 由于呈现这种形状的芯材35的轮廓在前端部31的更前端侧上接近接地电极30的外周面延伸，因此在驱动内燃机时， 能够从靠近接地电极30的更前端侧的外周面的位置将内燃机引导到芯材35上。结果，能够实现更有效的散热能力。