| 摘要 |
PROBLEM TO BE SOLVED: To ensure an insulation gap G without stepping a heating element 30 even in a glow plug with an external thread 13 sized to M8 or smaller. SOLUTION: A cylindrical cap 50 replaces a conventional lead coil as a metal connector for electrically connecting the heating element 30 and an inner shaft 40. The cylindrical form of the cap 50 can ensure a given sectional area even with a thin wall thickness. The thin wall thickness of the cap 50 can ensure the insulation gap G without a stepped form of the heating element 30 even in the glow plug with the external thread sized to M8 or smaller.
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