FIELD: electrics.
SUBSTANCE: plug includes annular shell (3) with main axis D; central electrode (7) made of second electroconductive material, running along main axis D and including internal section (8) inside the annular shell (3) and external section (9) outside the annular shell (3); annular electric insulation component (10) running at least around internal section (8) of central electrode (7) and fitting for installation between shell (3) and electrode (7), so that insulation component (10) covers only a part of external section (9) of central electrode (7), and insulation part (10) features annular collar covering the whole surface (6) of round shell outlet against uncovered part (16) of electrode (7).
EFFECT: increased probability of inflaming mix around the ignition plug installed in combustion chamber.
10 cl, 4 dwg
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