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    • 10. 发明申请
    • SPARK PLUG AND METHOD OF MANUFACTURING THE SAME
    • 火花塞及其制造方法
    • US20120112619A1
    • 2012-05-10
    • US13212668
    • 2011-08-18
    • Yuji KASUYAMasahiro INOUE
    • Yuji KASUYAMasahiro INOUE
    • H01T13/20H01T21/02
    • H01T13/32H01T21/02
    • A buried portion (32B) buried from a junction target surface of a ground electrode (27) is provided in a noble metal tip (32). In a section, perpendicular to a central axis CL2 of the ground electrode (27), a large width portion (32W) is formed in the buried portion (32B), and a region between the junction target surface and a largest width region of the large width portion (32W) is formed into a shape which gradually increases in width, or into a shape having a region of the relevant shape and a constant width region. A region from the large width portion (32W) to a point of intersection P1, P2 is covered with a base material of the ground electrode (27) and a melt portion (35), and a thickness t1 (mm) of the noble metal tip (32) and a buried amount t2 (mm) satisfy 0.25≦t2/t1.
    • 在贵金属端头(32)上设有从接地电极(27)的接合靶表面埋设的埋入部(32B)。 在垂直于接地电极(27)的中心轴线CL2的截面中,在埋入部分(32B)中形成大的宽度部分(32W),并且在接合靶表面和接合电极的最大宽度区域之间的区域 大宽度部分(32W)形成为宽度逐渐增大的形状,或具有相关形状区域和恒定宽度区域的形状。 从宽幅部(32W)到交点P1,P2的区域被接地电极(27)的基材和熔融部(35)覆盖,贵金属的厚度t1(mm) 尖端(32)和埋入量t2(mm)满足0.25≦̸ t2 / t1。