Measuring and testing – Tire – tread or roadway – Tire inflation testing installation
Patent
1983-11-29
1986-07-01
Woodiel, Donald O.
Measuring and testing
Tire, tread or roadway
Tire inflation testing installation
340 58, B60C 2302, G01L 706, G01L 910
Patent
active
045972869
ABSTRACT:
The present invention is a remote system for indicating tire pressure which includes a mechanical electromagnetic pressure sensor which is disposed outside a pneumatic tire which is mounted on a wheel rim. The mechanical electromagnetic pressure sensor includes a bellows which is fluidly coupled to the pneumatic tire through the wheel rim and a ferrite rod which is fixedly coupled to the bellows. The mechanical electromagnetic pressure sensor includes a pointer which is mechanically coupled to the bellows and indexing plate which provides a linear scale of the position of the pointer, the indexing plate is disposed adjacent, but not contiguous to the pointer so that the scale of the indexing plate mechanically provides a direct and visual reading of the pressure in the pneumatic tire. The remote system also includes a passive circuit having a first coil which is mechanically coupled to the wheel rim and a second coil which is electromagnetically coupled to the ferrite rod, which is slidably coupled to the second coil, all of which are electrically coupled to form a tuned circuit which resonates at a particular frequency which is dependent on the position of the ferrite rod. The remote system also includes a probe which detects the change in frequency at which the passive circuit resonates in order to provide a measure of movement of the ferrite rod in response to the change in pressure of the pneumatic tire.
REFERENCES:
patent: 2070743 (1937-02-01), McDonnell
patent: 2510785 (1950-06-01), Potts et al.
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