| 摘要 |
According to the present invention, in a glow plug comprising a cylindrical member connecting a center shaft and a heater, fractures in the heater are suppressed. The glow plug comprises a rod-shaped heater for holding a resistance heating element in the interior, a cylindrical main fixture for accommodating the heater, a rod-shaped center shaft accommodated inside the main fixture and receiving the conduction of an external electric current, and an electroconductive cylindrical member disposed inside the main fixture. The cylindrical member has an opening at either end, the rear end of the heater being press-fitted into one opening, and the distal end of the center shaft being inserted into the other opening, electrically connecting the resistance heating element of the heater and the center shaft. The heater has an electrode retrieval part in the outer peripheral surface. The cylindrical member has a middle part positioned between the one end and the other end and in contact with the electrode retrieval part, the thickness of the member in the one end being less than the thickness of the member in the middle part. |
