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    • 1. 发明专利
    • Spark plug for internal combustion engine
    • 火花塞用于内燃机
    • JP2014192100A
    • 2014-10-06
    • JP2013068430
    • 2013-03-28
    • Nippon Soken Inc株式会社日本自動車部品総合研究所Denso Corp株式会社デンソー
    • AOCHI TAKANOBUINOHARA TAKAYUKIOKABE SHINICHISHIBATA MASAMICHINISHIO NORIAKI
    • H01T13/02F02P13/00H01T13/32
    • F02M57/06F02P13/00H01T13/02H01T13/20H01T13/32
    • PROBLEM TO BE SOLVED: To provide a spark plug for an internal combustion engine capable of securing stable ignitability regardless of a mounting attitude with respect to an internal combustion engine.SOLUTION: A spark plug 1 comprises: a housing 2; an insulator 3; a center electrode 4 which is held inside of the insulator 3 in such a manner that a distal end portion 41 protrudes; a grounding electrode 5 formed from an erected portion 51 and a counter portion 52; and a distal end protrusion 22 including an air guiding plane 221 directed towards the erected portion 51 in a circumferential direction of the plug. The counter portion 52 of the grounding electrode 5 includes: a counter face 521 which opposes the center electrode 4; a back face 522 at an opposite side of the counter face 521; and a pair of side end faces 523 and 524 connecting the counter face 521 and the back face 522. Between the pair of side end faces 523 and 524, at least the side end face 523 closer to the distal end protrusion 22 is formed in such a manner that an angle formed with the counter face 521 becomes an obtuse angle.
    • 要解决的问题:提供一种能够确保稳定的点火性的内燃机的火花塞,而与内燃机的安装姿态无关。解决方案:火花塞1包括:壳体2; 绝缘子3; 中心电极4,其以前端部41突出的方式保持在绝缘体3的内部; 由直立部51和对置部52形成的接地电极5; 以及远端突起22,其包括沿插塞的圆周方向指向竖立部分51的空气引导平面221。 接地电极5的对置部52包括:与中心电极4相对的对置面521; 在对面521的相对侧的背面522; 以及连接对置面521和背面522的一对侧端面523,524。在一对侧端面523,524之间,至少形成有更靠近前端突起22的侧端面523, 与对置面521形成的角度成为钝角的方式。