SPARKING PLUG Russian patent published in 1994 - IPC

FIELD: engine manufacture. SUBSTANCE: sparking plug has casing 1 made of heat-proof material, ceramic insulator 2, semiconductor element made in form of a ring, central electrode which has working part 4 and contact rod 5, glass sealing compound disposed among casing 1, semiconductor element 3 and rod 5 of the central electrode. Rod 5 is made of a metal which has linear expansion gain being equal to the gain of material used for ceramic insulator 2. Working part 4 of the central electrode has bear 6 for fixing within semiconductor element 3 and blind hole 7 for locating contact rod 5 in it partially. Rod 5 is penetrated into hole 7 till achieving rest to form electric contact between parts of the electrode. EFFECT: improved resource; improved heat stability. 1 dwg