| 摘要 |
The spark plug includes a mounting bracket, a tubular insulator held by the mounting bracket, a center electrode held in the insulator, a main ground electrode forming a main spark discharge gap with the tip end portion of the center electrode, and an auxiliary ground electrode forming an auxiliary spark discharge gap with the end portion of the insulator. The auxiliary ground electrode has such shape as to provide a space in which the flame core produced by the spark discharge taking place in the auxiliary spark discharge gap can grow.
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