| 摘要 |
A self temperature control type glow plug has a metallic shell in which ceramic heater having a glow resistor of a tungsten-based alloy embedded in a silicon nitride ceramic is placed in a manner to extend beyond the front end of the shell. A temperature-regulating resistor of nickel, iron or nickel-iron alloy is embedded within the metallic shell in series with the glow resistor. Each resistor has a positive temperature coefficient (PTC), with the positive temperature coefficient of the glow resistor being smaller than that of the temperature-regulating resistor. The electrical resistance ratio of the temperature regulating resistor to the glow resistor falls within a range of 0.35 to 0.60 at room temperature.
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