| 摘要 |
<p>Provided is a ceramic glow plug equipped with a pressure sensor configured such that, even though a movable member having small heat transfer quantity is employed, deterioration in joining strength at a joint part between the movable member and a portion to which the movable member is attached is avoided, and good heat generation can be maintained over a long period of time. A heat-generating main portion P whose resistance is 75% of the total resistance of a ceramic heater 10 is located forward of the forward end of a holding sleeve 15. Thus, heat propagating rearward from the heat-generating main portion can be radiated from the ceramic heater to an engine head and a plug hole in the course of propagation to the joint part between the holding sleeve and the movable member. Therefore, the influence of heat on the joint part between the holding sleeve and the movable member can be reduced, whereby deterioration in joining strength can be restrained. As a result, there can be restrained damage to the ability to function as a pressure sensor resulting from deterioration in airtightness with respect to combustion gas.</p> |
