| 摘要 |
PROBLEM TO BE SOLVED: To provide a pressure sensor unit formed separately from a spark plug, dispensing with securing an additional space in a peripheral part of a pressure sensor element, capable of reducing the total weight, and easily mountable in a plug hole. SOLUTION: In this pressure sensor unit 1, when a unit body part 2 is mounted in the plug hole PH, the rear end(s) in the axial direction of an inner tube member 6 and/or an outer tube members 5 is/are positioned midway in the depth direction in the plug hole PH while a lead-wire support part 11 is provided integral with the body part 2 for supporting a portion of a sensor output lead wire 9 extending rearward of the rear end(s) of the tube member 6 and/or the tube member 5. In other word, by cutting off the tube member 6 and/or the tube member 5 midway in the depth direction in the plug hole PH, the total weight of the sensor unit can be reduced. Since the lead wire 9 extending rearward of the rear end(s) of the tube member(s) 5 and/or 6 is supported by the support part 11, the sensor unit can be smoothly mounted in the plug hole PH.
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