Electric heating – Heating devices – Resistive element: igniter type
Patent
1999-04-14
2000-05-16
Jeffery, John A.
Electric heating
Heating devices
Resistive element: igniter type
123145A, F23Q 700
Patent
active
060640391
ABSTRACT:
A glow plug has a sheath heater, a heating coil and a control coil. The sheath heater has a sheath tube having a closed leading end. The heating coil is disposed adjacent to the leading end of a projection of the sheath tube beyond a main metal shell. The control coil is connected in series to the rear end of the heating coil and arranged to be heated by the heating coil to raise the electrical resistance to control the supply of electric power to the heating coil. The projection of the sheath tube has a substantially uniform outer diameter in the axial direction and the outer diameter is between 3.0 mm to 4.4 mm. Therefore, a temperature rising characteristic at the surface of the leading end of the sheath tube has a peak temperature TP in an initial stage of energization and saturates at a temperature not higher than the peak temperature TP.
REFERENCES:
patent: 4380973 (1983-04-01), Steinke
patent: 4423309 (1983-12-01), Murphy et al.
patent: 4549071 (1985-10-01), Hatanaka et al.
patent: 4556781 (1985-12-01), Bauer
patent: 5093555 (1992-03-01), Dupuis et al.
patent: 5132516 (1992-07-01), Hatanaka et al.
patent: 5206483 (1993-04-01), Aota
"International Standard (ISO) 7578"; Road vehicles--Sheath-type glow-plugs--General requirements and test methods; Second edition--Dec. 15, 1986; pp. 1-3.
Jeffery John A.
NGK Spark Plug Co. Ltd.
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