Electric heating – Heating devices – Resistive element: igniter type
Patent
1984-12-10
1986-04-15
Mayewsky, Volodymyr Y.
Electric heating
Heating devices
Resistive element: igniter type
123145A, 219260, 219523, 219543, 219505, 361266, 431262, 338 22R, 338300, F23Q 722
Patent
active
045829802
ABSTRACT:
A glow plug for preheating the combustion chamber of a diesel engine includes a tubular metal sheath (5) closed at an end to define a tip and in which an electric heating element spiral (7) is embedded within a powder (6) of an electrically insulating material. The spiral (7) is connected by one end to the sheath tip and and at its other end to a current feeder (4). The filament (8) of the spiral (7) is advantageously made of a Fe-Cr-Al alloy and is coated for an initial length (L.sub.1) of the spiral (7), from the connection location thereof with the current feeder (4), with a high electrical conductivity material (9), preferably nickel (Ni) having a very high positive temperature coefficient of resistance with respect to that of the filament (8). The uncoated end length (L.sub.2) of the spiral (7) acts as a heating element while the initial coated length (L.sub.1) acts as a control resistance element for the supply current upon increase in the sheath temperature. The thickness of the coating (9) and the coated length L.sub.1 of the spiral (7) are chosen to provide the desired electric and thermal characteristics of the glow plug.
REFERENCES:
patent: 2482551 (1949-09-01), Korsgren
patent: 2708252 (1955-05-01), Cohn
patent: 2708253 (1955-05-01), Cohn
patent: 2846557 (1958-08-01), Schultze et al.
patent: 4211204 (1980-07-01), Glauner et al.
patent: 4423309 (1983-12-01), Murphy et al.
patent: 4476378 (1984-10-01), Takizawa et al.
patent: 4477717 (1984-10-01), Walton
Fabbrica Italiana Magneti Marelli S.p.A.
Mayewsky Volodymyr Y.
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