| 摘要 |
A diesel engine glow plug includes a hollow holder, a ceramic heater, an electrically conductive annular member, an external connecting terminal, and an insulating sleeve. The annular member is interposed between the rear end portion of the ceramic heater and the distal end portion of the hollow holder. The external connecting terminal engages with the rear end portion of the ceramic heater from the rear end portion of the holder through an interior of the holder. The insulating sleeve is housed in the hollow holder to electrically insulate the external connecting terminal from the hollow holder. The ceramic heater includes a U-shaped heating portion and a pair of parallel lead portions extending backward from the heating portion and terminating in an enlarged diameter portion defining the rear end portion of the heater. One of the lead portions is electrically connected to the holder through the annular member. The remaining one of the lead portions is engaged with and electrically connected to the external connecting terminal. The rear end portion of the hollow holder fixes the above members housed in the holder. The annular member has a cylindrical portion, which surrounds the rear end portion of the heater, and a tapered portion which electrically connects the distal end portion of the holder with one of the lead portions.
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