| 摘要 |
<p>A coupling member 180 of a glow plug 100 includes a first bend 183 and a second bend 184 folded in an axis direction OD and a joint section 185 in a tapered shape configured to connect the first bend 183 with the second bend 184 and reduce the diameter toward a rear end side of a body portion. Accordingly, in a limited space formed between a housing 130 and a heater unit 150, this configuration increases the length of the coupling member 180, compared with a configuration without any bend folded in the axis direction OD. This results in decreasing the spring constant k of the coupling member 180 and suppressing extension of the coupling member 180 in the axis direction due to thermal expansion. This accordingly prevents an unnecessary load due to the extension of the coupling member 180 in the axis direction from being applied to a pressure sensor 160 via the heater unit 150 and improves the measurement accuracy of the pressure sensor 160.</p> |
