| 摘要 |
PROBLEM TO BE SOLVED: To restrict lowering of the pneumatic pressure of a tire due to a natural leakage of oxygen in the air filled in a tire air chamber. SOLUTION: In a TPMS valve unit 18A fitted to a wheel rim 14a and formed with an air guide path 30 communicating the inside of the tire air chamber 16 with the outside thereof so as to guide air into the tire air chamber 16, a deoxidant 34 is arranged in the air guide path 30. The air guide path 30 is formed to pass through both of the air guide path 30 and a tire pneumatic pressure detecting portion 22. The deoxidant 34 is arranged in a second air guide path 30b, a part passing through the tire pneumatic pressure detecting portion 22 out of the air guide path 30. COPYRIGHT: (C)2008,JPO&INPIT
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