| 摘要 |
PROBLEM TO BE SOLVED: To realize a structure at low cost capable of measuring accurately the air pressure in a tire 38 during travelling, and hardly generating a disconnection fault in a circuit for transmitting a detection signal of a rotation detection sensor 51. SOLUTION: A radio signal transmitted from a first transmission antenna 41 of a pneumatic sensor unit 40 and a radio signal transmitted from a second transmission antenna 60 of a rotation sensor unit 56 are received by a single reception antenna 47. The detection signal of the rotation detection sensor 56 is transmitted to the body side by utilizing the reception antenna 47 indispensable for pneumatic measurement during travelling, to thereby reduce a part cost and an assembly cost. |
