SPARK PLUG Russian patent published in 1995 - IPC

FIELD: gasoline engine. SUBSTANCE: spark plug has body 1, insulator 2, center electrode 3, terminal 4, center electrode part 5 protruding from insulator, negative electrode 6 whose end 7 is of conical shape, In addition, spark plug is provided with one or more negative electrodes similar to that mentioned above; axes of negative electrodes are intersecting and angle at top of negative electrode end is 110 to 130 deg. conical part of negative electrode has two or more faces forming one or more ribs; one or more slits are provided at negative electrode top. Center electrode end facing negative electrode is of flat-pad or conical-cavity shape, or of toroidal shape. Center electrode end facing negative electrode has edge perpendicular to its axis or is shaped ar cylinder or sphere. EFFECT: improved economic efficiency and starting conditions of engines using these spark plugs. 6 cl, 12 dwg