| 摘要 |
PROBLEM TO BE SOLVED: To improve the accuracy in detection without changing the spring constant and to surely detect the lowering of the tire pneumatics during the driving at a high speed. SOLUTION: A tire pneumatics sensor comprises a pipe 3 having a diaphragm 2 on its one end. An one end closed-cylindrical pressure receiving member 11 having a central axis in common with the pipe 3, is mounted in the pipe 3 in such manner that its closed end side is arranged at an end side mounting the diaphragm 2, of the pipe 3. The closing end of the pressure receiving member 11 is provided with a taper part 11a having a diameter widened toward the end part. Further a hole 11b having the central axis in the same with the pipe 3 is bored on the cylindrical inner part of the pressure receiving member 11. A pin 12 to be inserted into the hole 11b is fixed to an internal end part at a magnet 9 side of a cylindrical magnet supporting member 5.
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