| US 7,561,035 B2 | ||
| Wireless sensor system and bearing assembly equipped with the same | ||
| Koji Sahashi, Iwata (Japan); Koichi Okada, Iwata (Japan); and Masatoshi Mizutani, Iwata (Japan) | ||
| Assigned to NTN Corporation, Osaka (Japan) | ||
| Appl. No. 10/526,903 PCT Filed Sep. 08, 2003, PCT No. PCT/JP03/11459 § 371(c)(1), (2), (4) Date Mar. 07, 2005, PCT Pub. No. WO2004/023422, PCT Pub. Date Mar. 18, 2004. |
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| Claims priority of application No. 2002-262262 (JP), filed on Sep. 09, 2002; and application No. 2003-306181 (JP), filed on Aug. 29, 2003. | ||
| Prior Publication US 2005/0258950 A1, Nov. 24, 2005 | ||
| Int. Cl. B60C 23/00 (2006.01) | ||
| U.S. Cl. 340—442 [73/146.3; 701/36] | 28 Claims |
| 1. A wireless sensor system comprising:
a plurality of sensors to detect respective parameters to be detected;
a sensor signal transmitter to transmit wireless sensor signals outputted respectively from the sensors;
a plurality of electric power receivers to receive wirelessly an electric operating power required to drive the sensors and
the sensor signal transmitter;
a sensor signal receiver to receive the sensor signals transmitted from the sensor signal transmitter; and
an electric power transmitter to transmit the electric operating power wirelessly to the electric power receiver,
wherein only one sensor signal receiver is provided for commonly receiving the sensor signals from the plural sensors,
only one electric power transmitter is provided for commonly transmitting the electric operating power wirelessly to the plural
electric power receivers,
the electric power receiver supplies directly the sensors and the sensor signal transmitter with the electric operating power,
and
the sensor signal receiver includes a single variable tuning circuit for varying to tune to each of natural frequencies transmitted
respectively from the plural sensors and a switching element to switch among varying natural frequencies of the tuning circuit
to select the natural frequencies one at a time on a time sharing basis.
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