发明名称 |
Tire air pressure monitoring device using the wheel or a coil wound around the stem as the transmitter antenna |
摘要 |
A device for monitoring the air pressure of a wheel. The device prevents a decrease in the transmission level of radio waves caused by impedance mismatch between an antenna, which radiates the radio waves, and a circuit, which produces signals that are to be radiated as the radio waves. The device includes a valve stem through which air is charged. The valve stem extends through a vehicle wheel. A transmitter is secured to the wheel to transmit a signal representing the air pressure of the wheel to a receiver installed in the vehicle. The device further includes a case attached to the wheel. The case is connected to the valve stem. An electric circuit is accommodated in the case to detect the air pressure and convert the detected pressure to an electric signal. An antenna radiates the signal produced by the electric circuit and is arranged about the valve stem. A conveying mechanism conveys the signals produced by the electric circuit to the antenna.
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申请公布号 |
US6101870(A) |
申请公布日期 |
2000.08.15 |
申请号 |
US19980146992 |
申请日期 |
1998.09.04 |
申请人 |
PACIFIC INDUSTRIAL CO., LTD. |
发明人 |
KATO, MICHIYA;ORITO, KATSUMI |
分类号 |
B60C23/04;(IPC1-7):B60C23/02 |
主分类号 |
B60C23/04 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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