| 摘要 |
<p>PURPOSE: To make wireless transmission possible by detecting the change of tire pressure by a diaphragm to operate a mechanical switch, and operating a transmitting means to output a signal to the valve foot part side of a tire valve. CONSTITUTION: When controlled tire pressure drops, the pressure of a reference pressure chamber 44 surpasses the tire pressure, and a diaphragm 40 is deformed onto the valve shaft 2 side in a figure, so that a metal plate 41 provided at the diaphragm 40 comes in contact with a conductor part 42 to form an electric circuit with a circuit board 23. A current therefore flows from a button battery 26, and a signal is sent out from an antenna 25. The signal is stopped to reset by sequence control. This constitution makes wireless transmission possible.</p> |
