SPARK PLUG HAVING LONG SERVICE LIFE

摘要

The invention relates to a spark plug comprising a center electrode (2), a first ground electrode (3) disposed in an arc-shaped form having a horizontal area (3a) and a substantially vertical area (3b), and at least one second ground electrode (4) disposed adjacent to the center electrode (2) such that a distance (S1) between the first ground electrode (3) and the center electrode (2) is smaller than a distance (S2) between the second ground electrode (4) and the center electrode.