| 摘要 |
A spark plug comprising a solid, electrically and thermally conductive housing (1) with a connecting means and in the inner cavity whereof a gasproof ceramic insulator (2), with a central electrode (9), is placed, and the protruding tip thereof, has at least one ring-shaped auxiliary electrode (4, 5) provided on the extended portion of the ceramic insulator forming a spark gap with the one end of the housing (1) and with the central electrode (9). The peripheral edges of the auxiliary ring-shaped electrode (4, 5) are thickened. There are at least two auxiliary ring-shaped electrodes (4, 5) and their inner or outer collars (12) project in the same direction. The auxiliary ring-shaped electrodes (4, 5) are made of titanium nitride (TiN) formed of layers shaped into the surface of a truncated cone having thicker upper and lower peripheral edges conforming to the narrowing tip of the cylindrical ceramic insulator (2).
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