Ladas & Parry
Tire pressure indicator including pressure gauges that have a self-generating power capability
 A tire pressure indicator includes a pressure gauge for a pneumatic tire of a vehicle. The pressure gauge has a casing formed with an aperture and mounted on the pneumatic tire such that air in the pneumatic tire flows into the casing via the aperture. A signal generating device is disposed in the casing and is capable of transmitting wirelessly a pressure signal corresponding to pressure of the air in the pneumatic tire. A power supplying device is disposed in the casing and is connected electrically to the signal generating device so as to supply electric power for operating the signal generating device. The power supplying device includes a self-generating voltage unit which has a spring plate with a mounting end secured to the casing and an opposite distal end, a weighting block secured to the distal end, and a piezoelectric unit secured to the spring plate. The spring plate is capable of deforming so as to subject the piezoelectric unit to mechanical stress when the pneumatic tire is in motion so as to enable the piezoelectric unit to generate a voltage output. 
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B60C B60C B60C B60C
inventional inventional inventional inventional
Tien-Tsai
Huang