SPARK PLUG Russian patent published in 1999 - IPC

FIELD: electrical engineering; spark plugs for ignition of fuel mixture in internal combustion engine. SUBSTANCE: spark plug has body with chamber in form round truncated cone whose smaller base changes into cylindrical shell terminating in bell. Central electrode with changeable attachment piece is arranged inside chamber in insulator made in form of round truncated cone. EFFECT: provision of reliable spark discharge, prevention of fouling of electrode, increased service life and enhanced reliability of spark plug. 4 cl, 1 dwg