Measuring and testing – Tire – tread or roadway – Tire inflation testing installation
Patent
1982-08-10
1984-08-28
Woodiel, Donald O.
Measuring and testing
Tire, tread or roadway
Tire inflation testing installation
340 58, B60C 2302
Patent
active
044676417
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a device for measuring a parameter, such as for example a pressure, pertaining to a rotary element such as for example a wheel, said device being applicable in particular to the measuring of the internal pressure of a pneumatic tire on a wheel, for example an aircraft undercarriage wheel.
Several devices have already been proposed for giving an indication of the value of a parameter pertaining to a rotary element or a wheel. This parameter may be in particular the pressure in a pneumatic tire mounted on a wheel.
Most of the devices can only provide an indication limited to a definite value of the parameter which closes or opens an electric contact, the reading of the corresponding information being effected upon each rotation of the wheel when there is an angular coincidence between the element carried by the wheel and a corresponding fixed element. Apart from the fact that they are incapable of effecting a measurement within wide range of values, these devices are limited in their utilization, since when the rotary element stops in a random position, they are unable to effect the measurement or ensure the transmission of a measurement which had been effected.
It has also been proposed to mount on a wheel carrying a pneumatic tire, a radio or ultrasonic transmitter which is capable of transmitting information to a receiver mounted on a fixed part. Such devices may possibly operate even when the rotary element stops in a random position. They are of limited use, since the source of energy required for the transmission is necessarily weak so that these devices are solely used as means for giving a warning of deflation of pneumatic tires. Further, the use of ultrasonic or hertzian waves can hardly be envisaged in applications such as aircraft undercarriages owing to the severe conditions of the environment and possible hertzian and ultrasonic interferences.
It has also already been proposed to provide a device which transmits electric energy at a first frequency between a fixed element and a rotary element through a transformer whose primary and secondary windings are rotatable with respect to each other, this transformer transmitting in the opposite direction an electric signal of distinctly higher fixed frequency generated in the rotating part and transmitted to the fixed part. However, such a device is incapable of providing in a simple manner the result of a measurement which would be effected in the rotating part and consequently cannot be used in a simple and precise manner.
There has also been proposed a device for measuring pressure in a pneumatic tire of an aircraft wheel in which an electric generator delivers to a measuring circuit installed in the wheel itself, through coupling means, high-frequency electric energy, the device transmitting in the opposite direction a measurement signal within the low-frequency range. Such a device is relatively easy to construct but its performances are necessarily limited owing to the transfer of the results of the measurement at low frequency.
An object of the present invention is to overcome these drawbacks and to provide a device for measuring a parameter pertaining to a rotary element which permits the obtainment in a continuous or substantially continuous manner the value of the measurement irrespective of the angular position of the rotary element while it rotates or while it is stationary.
Another object of the invention is to provide such a device which is capable of providing, with a high degree of reliability, measurement indications which are extremely precise over a wide range of variation of the parameter.
Another object of the invention is to provide such a device which is simple in construction and permits precise measurements to be effected.
Still another object of the invention is to provide such a device which is in particular adapted to effect measurements in respect of rotary elements such as aircraft wheels and operating in a particularly difficult environment.
A further object of the invention is to provide s
REFERENCES:
patent: 2070743 (1937-02-01), McDonnell
patent: 3824857 (1974-07-01), Smith
patent: 4148008 (1979-04-01), Lusk et al.
patent: 4283707 (1981-08-01), Church
patent: 4334428 (1982-06-01), Fima et al.
Precision Mechanique Labinal
Woodiel Donald O.
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