Patent ID: 6037568
Filing Date: 2000-03-14
Classification: F23Q,H05B

Abstract:
A glow plug for a diesel engine, comprising:a first helical resistor serving as a heater element;a second helical resistor connected in series with said first helical resistor said second helical resistor having a positive temperature coefficient of resistance larger than that of said first helical resistor, and said second helical resistor controlling power supply to said first helical resistor;a sheath enclosing said first and second helical resistors in a heat-resistant insulating powder, said sheath having an elongated small-diameter portion on a distal end side thereof and a large-diameter portion on a rear end side thereof, one end of said first helical resistor being connected to a distal end inner wall of said small-diameter portion of said sheath;an electrode rod having a distal end portion to which one end of said second helical resistor is connected; anda cylindrical housing for supporting said large-diameter portion on a rear end side of said sheath, and said electrode rod,wherein said first helical resistor is disposed in a distal end portion of said small-diameter portion of said sheath, said second helical resistor is disposed from said small-diameter portion to said large-diameter portion of said sheath, and said second helical resistor is connected to said first helical resistor at the distal end side of said small-diameter portion.