SPARK PLUG FOR MULTIFUEL INTERNAL-COMBUSTION ENGINE Russian patent published in 1997 - IPC

FIELD: fuel ignition, especially at low temperatures, in multifuel internal-combustion engines. SUBSTANCE: spark plug has body 1 accommodating central electrode 2 with ceramic insulator 3 and bush 4 of electricity conducting magnetic material, as well as at least two cylindrical coils 7, 8 arranged about bush 4 coaxially in respect to electrode 2, one of them being secured at one end on bottom part of body 1 and at other end, on disc 6. Novelty is that spark plug is provided with additional tubular electrode 5 placed in insulator coaxially to central electrode 2 and connected to inner surface of bush 4 and end of mentioned disc 6; second coil 8 is joined at one end directly with central electrode 2 through hole in disc 6 and its other end is loose. EFFECT: improved reliability. 1 dwg