Device for measuring a parameter on a rotary element, and in particular for measuring the pressure of a pneumatic tire on a wheel
US4467641A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 10, 1982 |
| Grant date | Aug 28, 1984 |
| Priority date | — |
| Expiry date | Aug 10, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01L17/00
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
The device for measuring a parameter pertaining to a rotary element rotating about a shaft carried by a fixed structure, comprises, on the rotary element, at least one sensor (15) with an associated electric circuit and, on the structure, an electric energy generator (3), coupling means (6, 11) for transmitting electric energy from the generator (3) to the sensor (15) and, in return, the signals from the sensor (15) to utilization means (8, 9). The generator (3) produces electric power at a frequency lower than 100 kHz and the circuit associated with the sensor (13, 14, 16, 17, 18, 19, 20) generates a signal of high frequency which varies within a wide band between 20 and 100 kHz, the coupling being achieved by a transformer (6, 11) in the form of a rotating machine whose structure allows the passage of a wide pass band at least between the frequency of the generator and 100 kHz. This device is in particular applicable to the measurement of the pressure of pneumatic tires of aircraft undercarriages.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.