Glow plug for diesel engine with ptc control element disposed in small-diameter sheath section and connected to the distal end thereof
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Mar 14, 2000
Grant Date -
N/A
app pub date -
Jan 10, 1997
filing date -
Jan 18, 1996
priority date (Note) -
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status (Latency Note)
Importance
Abstract
A glow plug for a diesel engine includes a heat generating coil, a control coil, a sheath, an electrode rod, and a housing. The heat generating coil serves as a heater element. The control coil is connected in series with the heat generating coil and serves as a controller for controlling power supply to the heat generating coil. The control coil has a positive temperature coefficient of resistance larger than that of the heat generating coil. The sheath accommodates the heat generating coil and the control coil to be embedded in a heat-resistant insulating powder. The sheath has an elongated small-diameter portion on a distal end side thereof and a large-diameter portion on a rear end side thereof. The heat generating coil is connected to an inner wall of a distal end of the small-diameter portion of the sheath. The electrode rod has a distal end portion to which one end of the control coil is connected. The housing supports a rear end portion of the sheath on the distal end side thereof, and the electrode rod. The heat generating coil is disposed in a distal end portion of the small-diameter portion of the sheath, and the control coil is disposed to extend from the small-diameter portion to the large-diameter portion of the sheath.
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