| 摘要 |
A glow plug for a diesel engine includes a first resistor serving as a heating element, second and third resistors, a sheath which incorporates the first, second, and third resistors, a heat-resistant insulating powder filled in the sheath to insulate the first, second, and third resistors from each other, and a cylindrical housing for holding the sheath. The second and third resistors are connected in series with the first resistor, are made of a material having a positive resistance-temperature coefficient, and have a positive resistance-temperature coefficient larger than that of the first resistor. The heat capacity of a given sheath portion having the third resistor therein is set larger than that of the other sheath portions.
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