SPARK PLUG Russian patent published in 1995 - IPC

FIELD: Otto-cycle internal combustion engines. SUBSTANCE: spark plug has metal housing 1, insulator 2, which is located inside housing 1, central electrode 3, located in center of insulator 2, terminal 4, which is connected to high-voltage wire of ignition system, central electrode end 5, which goes outside insulator, main negative electrode 6, which extending end 7 is shaped as cone directed to central electrode. In addition device has additional negative electrode 8 and spark gap 9. New feature is conic shape of main negative electrode end, which axis is perpendicular to face surface of second end of central electrode. Additional negative electrode is made in one piece with housing and is shaped as sharp bulge on its inner surface. Axis of additional electrode intersects with axis of conic end of main electrode between latter and face surface of main electrode. Spark plug also has several additional electrodes of same design, which are uniformly arranged around axis of conic end of main negative electrode, so that axes of additional electrodes intersect each other. Spark plug may have at least three additional electrodes, which axes are intersected in point which lies on face surface of second end of central electrode. EFFECT: increased functional capabilities. 3 cl, 7 dwg