Spark plug
    94.
    发明授权

    公开(公告)号:US2079561A

    公开(公告)日:1937-05-04

    申请号:US2079561D

    CPC分类号: H01T13/05

    Spark plug
    100.
    发明授权

    公开(公告)号:US09853422B2

    公开(公告)日:2017-12-26

    申请号:US15269811

    申请日:2016-09-19

    IPC分类号: H01T13/05 H01T13/16

    CPC分类号: H01T13/05 H01T13/16

    摘要: A spark plug may include a center electrode disposed in a center portion of the spark plug, an insulator surrounding the center electrode, and a metal shell surrounding the insulator and having a ground electrode extending downwards from a lower end of the metal shell and an inner surface facing the insulator, the inner surface being concavely shaped to form a shielding space between the concavely shaped portion of the inner surface and the insulator for adjusting a heat range of the spark plug.