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    Method for manufacturing spark plug
    52.
    发明公开
    Method for manufacturing spark plug 审中-公开
    火花塞的制造方法

    公开(公告)号：EP2216863A3

    公开(公告)日：2014-07-23

    申请号：EP10153039.2

    申请日：2010-02-09

    申请人： NGK Spark Plug Co., Ltd.

    发明人： Suzuki, Akira ,  Nakamura, Mai ,  Musasa, Mamoru

    IPC分类号： H01T21/02

    CPC分类号： H01T21/02

    摘要： A method for manufacturing a spark plug which includes: (a) preparing a metal shell; (b) preparing an insulator; (c) inserting the insulator in an insertion hole of the metal shell; (d) forming an intended crimping portion of the metal shell into a crimping portion; and (e) pressing a lower side portion of the metal shell closer to a position lower than the intended compressive deformation portion, and pressing the crimping portion of the metal shell in an axial direction to compressively deform the intended compressive deformation portion of the metal shell and thus seal a space between a stepped portion of the metal shell and a stepped portion of the insulator, wherein step (e) controls a pressing amount of a press in a constant value from the start of compressive deformation to the end thereof.

    摘要翻译： 一种制造火花塞的方法，其包括：（a）制备金属壳; （b）制备绝缘体; （c）将绝缘体插入金属壳体的插入孔中; （d）将金属壳体的预期卷曲部分形成卷曲部分; （e）将所述金属壳的下侧部分压向比所述预定压缩变形部低的位置，并且将所述金属壳的所述压接部沿轴向压入，以使所述金属壳的所述预定压缩变形部压缩变形 并且因此密封所述金属壳的台阶部分和所述绝缘体的台阶部分之间的空间，其中步骤（e）将压机的压制量控制在从压缩变形开始到其末端的恒定值。

    Method of manufacturing spark plug
    54.
    发明公开
    Method of manufacturing spark plug 有权
    一种用于制造火花塞的方法

    公开(公告)号：EP2568548A3

    公开(公告)日：2014-06-11

    申请号：EP12183345.3

    申请日：2012-09-06

    申请人： NGK SPARK PLUG CO., LTD.

    发明人： Kanemaru, Tomonori ,  Yoshimoto, Osamu ,  Kikai, Takaaki ,  Inoue, Masahiro

    IPC分类号： H01T21/02 ,  H01T13/39

    CPC分类号： H01T21/02 ,  H01T13/39

    摘要： An object is to enable a burr-free surface of a tip to be welded to a ground electrode more reliably, to thereby realize an excellent joint strength.
    Means for Solution
    A spark plug (1) includes a center electrode (5), a ground electrode (27), and a ground-electrode-side tip (32) joined to the ground electrode (27) through its joining surface (32B). A process of manufacturing the spark plug (1) includes a tip forming step and a tip joining step of resistance-welding the ground-electrode-side tip (32) to the ground electrode (27). The tip forming step includes a wire rod forming step of forming a wire rod (WR) having a reference surface (BS), and a wire rod cutting step of cutting the wire rod (WR) by moving a cutting blade CE from one edge of the reference surface (BS) with respect to the width direction thereof toward the other edge of the reference surface (BS) with respect to the width direction, to thereby obtain the ground-electrode-side tip (32). In the tip joining step, at least a portion of the reference surface (BS) of the ground-electrode-side tip (32) is joined to the ground electrode (27), whereby that portion becomes the joining surface (32B).

    Spark plug
    55.
    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。

    METHOD OF MANUFACTURING SPARK PLUG
    57.
    发明公开
    METHOD OF MANUFACTURING SPARK PLUG 审中-公开

    公开(公告)号：EP2278671A4

    公开(公告)日：2014-03-26

    申请号：EP09733721

    申请日：2009-04-22

    申请人： NGK SPARK PLUG CO

    发明人： MUSASA MAMORU ,  SUZUKI AKIRA

    IPC分类号： H01T13/20 ,  H01T13/46 ,  H01T21/02

    CPC分类号： H01T13/467 ,  H01T21/02

    摘要： To provide a method of producing a spark plug in which a spark discharge gap with a suitable distance can easily be obtained without bending to deform a ground electrode in a direction in which the ground electrode moves towards or away from a metal tip of a center electrode, in the method of producing a spark plug, when a metal tip (a noble metal tip) 21 is welded to a front end portion 13a of a center electrode 13, the metal tip 21 is welded to the front end portion 13a of the center electrode 13 after a state is established in which the metal tip 21 alone is positioned in a radial direction where a predetermined spark discharge gap g is formed relative to a distal end portion 14b of a ground electrode 14 which is joined to a metal shell 11 at a proximal end portion 14a thereof.

    SPARK PLUG AND PRODUCTION METHOD THEREFOR
    58.
    发明公开
    SPARK PLUG AND PRODUCTION METHOD THEREFOR 审中-公开
    火花塞及其制造方法

    公开(公告)号：EP2704270A1

    公开(公告)日：2014-03-05

    申请号：EP12777255.6

    申请日：2012-03-07

    申请人： NGK Spark Plug Co., Ltd.

    发明人： SAKAKURA, Yasushi ,  MATSUNAGA, Yuichi

    IPC分类号： H01T13/20 ,  F02P13/00 ,  H01T13/46 ,  H01T21/02

    CPC分类号： H01T13/32 ,  F02P13/00 ,  H01T13/20 ,  H01T13/467 ,  H01T21/02

    摘要： A technique of reducing the occurrence of multiple discharge in a spark plug is provided. The spark plug has a main ground electrode and three auxiliary ground electrodes. The position at which the first auxiliary ground electrode is joined to a metallic shell is located opposite the position at which the main ground electrode is joined to the metallic shell, with respect to a center electrode. The positions at which the second and third auxiliary ground electrodes are joined to the metallic shell are located opposite to each other with respect to the center electrode. When the width of the first auxiliary ground electrode is represented by W, the shortest distance between the second auxiliary ground electrode and the third auxiliary ground electrode is represented by T, and a distance which is a component of the shortest distance T in a direction orthogonal to the first auxiliary ground electrode is represented by Tp, a relation W ≥ tp is satisfied.

    摘要翻译： 提供了一种减少火花塞中多次放电的发生的技术。 火花塞具有主接地电极和三个辅助接地电极。 第一辅助接地电极接合到金属壳的位置与主接地电极相对于中心电极接合到金属壳的位置相对。 第二和第三辅助接地电极接合到金属壳的位置相对于中心电极彼此相对。 当第一辅助接地电极的宽度由W表示时，第二辅助接地电极和第三辅助接地电极之间的最短距离由T表示，并且距离是在正交方向上的最短距离T的分量 到第一辅助接地电极的距离由Tp表示时，满足W≥tp的关系。