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    SPARK PLUG FOR INTERNAL COMBUSTION ENGINE
    1.
    发明公开
    SPARK PLUG FOR INTERNAL COMBUSTION ENGINE 有权
    内燃机用火花塞

    公开(公告)号：EP2264844A1

    公开(公告)日：2010-12-22

    申请号：EP09729784.0

    申请日：2009-04-03

    申请人： NGK Spark Plug Co., Ltd.

    发明人： KUNITOMO, Iwao ,  BAN, Kenji

    IPC分类号： H01T13/46 ,  H01T13/20 ,  H01T13/32

    CPC分类号： H01T13/32 ,  H01T13/20

    摘要： An object of the present invention is to offer a spark plug for internal-combustion engines, which has excellent ignitability and sufficient anti-fouling characteristics. A spark plug 1 is comprised of a ceramic insulator 2 having an axial bore 4 extending in an axis CL1 direction, a metal shell 3 provided on an circumference of the ceramic insulator 2, a center electrode 5 inserted in the axial bore 4, and a ground electrode 27 provided in a front end portion 26 of the metal shell 3. A spark discharge gap 33 is formed between the ground electrode 27 and the center electrode 5. The ground electrode 27 is positioned such that the front end portion thereof is outside of a virtual outer circumferential face KG and is positioned on the front end side with respect to a virtual face KS in the axis CL1 direction. The virtual outer circumferential face KG is defined by extending a front end outer circumferential face 5G of the center electrode 5 in the axis CL1 direction, and the virtual face KS includes the front end of the center electrode 5. The present invention satisfies an equation of: 1.1 = b / a = 1.6 ,
    where "a" (mm) represents a first minimal distance between the front end portion of the center electrode 5 and the front end portion of the ground electrode 27,
    where "b" (mm) represents a second minimal distance between the front end portion of the ceramic insulator 2 and the front end portion of the ground electrode.

    摘要翻译： 本发明的目的在于提供一种内燃机用火花塞，其具有优异的可燃性和充分的防污特性。 火花塞1由具有在轴线CL1方向上延伸的轴向孔4的陶瓷绝缘体2，设置在陶瓷绝缘体2的圆周上的金属壳3，插入轴向孔4中的中心电极5以及 接地电极27设置在金属壳3的前端部26中。火花放电间隙33形成在接地电极27和中心电极5之间。接地电极27被定位为使得其前端部位于 假想外周面KG，并且相对于虚拟面KS在轴线CL1方向上位于前端侧。 虚拟外周面KG通过使中心电极5的前端外周面5G沿轴线CL1方向延伸而形成，假想面KS包含中心电极5的前端。本发明满足式 ：1.1 <= b / a <= 1.6，其中“a”（mm）表示中心电极5的前端部分与接地电极27的前端部分之间的第一最小距离，其中“b” ）表示绝缘子2的前端部分和接地电极的前端部分之间的第二最小距离。