| 摘要 |
PROBLEM TO BE SOLVED: To provide a tire air pressure alarm which can stabilize the intensity to receive the electric wave signal sent from a transmitter and can be mounted on an existing vehicle and maintained with ease. SOLUTION: In a tire air pressure alarming device 1 wherein the pressure in the tire 3 secured to a wheel 2 having an air valve 2b in a rim 2a is detected by a pressure sensor 4, and the detected signal is sent to a receiver, which is set on a vehicle side, from the transmitter 5, the transmitter 5 and a power source 6, which supplies electric power to the transmitter 5 and the pressure sensor 4, are installed in the rotation center section 2X of the wheel 2, and the pressure sensor 4 is communicated with the air valve 2b.
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