Multielectrode spark plug

摘要

In order to provide a multielectrode spark plug which is excellent in resistance to fouling and in which the voltage required for producing a spark can be lowered, the tip portion of at least one of plural ground electrodes is positioned in the side of an annular front end face of an insulator to form a semi-creeping spark discharging gap elongating along the surface of the insulator with the tip portion of a center electrode, and the tip portions of the ground other electrodes form aerial spark discharging gaps with the tip portion of the center electrode. <IMAGE>