| 摘要 |
PROBLEM TO BE SOLVED: To provide a glow plug for effectively transferring the quantity of heat generated in a coil member to a metal tube. SOLUTION: The glow plug 1 comprises the cylindrical metal tube 3 having a closed front end and extending to the axial direction, a rod insulator 14 stored in the metal tube 3 and arranged at a space from the metal tube 3, the coil member 5 arranged around the outer peripheral face of the insulator, and an insulating powder 15 filled in the metal tube 3 to be sealed. The insulator 14 is formed of a material having lower heat conductivity than the insulating powder 15. Thus, heat conductivity in the coil member 5 is lower than heat conductivity between the coil member 5 and the metal tube 3, suppressing the conduction of heat generated in the coil member 5 to the inside of the coil member 5 and permitting the effective conduction to the metal tube 3. COPYRIGHT: (C)2005,JPO&NCIPI
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