FR2535846A1 - WIRELESS CONTROL DEVICE FOR INFLATION PRESSURE OF AIRCRAFT WHEELED TIRES - Google Patents

Abstract

WIRELESS CONTROL DEVICE FOR AIRCRAFT WHEEL INFLATION PRESSURE. THE CHECKING OF THE INFLATION PRESSURE OF UNLOADED AIRCRAFT WHEELS, THAT IS BEFORE A LANDING, IS CARRIED OUT BY MEANS OF A KNOWN INFLATION PRESSURE MONITORING SYSTEM WHICH WILL MEASURE ONLY WHEN 'ONE WHEEL 2 TURNS. TO PERFORM THIS ROTATION OF THE WHEEL, THE WHEELS OF THE AIRPLANE INCLUDE A ROTATION DEVICE 7 CONSTITUTED BY BLADES 9 MOUNTED ON THE WHEEL TO TURN IT UNDER THE EFFECT OF THE RELATIVE WIND. APPLICATIONS: TO AIRPLANES, HELICOPTERS AND SIMILAR AIRCRAFT.

Description

Wireless control device for inflation pressure

of aircraft wheel tires.

  The present invention relates to a device for wireless control of the inflation pressure of aircraft wheels in the unloaded state, which comprises a

  stationary transmitter group and a transducer attached to the -

  wheel at a distance from the previous one, generating in the transmitter through the air gap pulses picked up by an electronic processing group, at a

prescribed pressure.

  Motor vehicles are known to have a pressure control system measuring when the wheel rotates at least once.

  basically a transducer on the wheel and a trans-

  driver on the chassis At each turn of the wheel, the transducer

  a pressure switch produces an impulse in the transmitter (shaped as a high

  frequency), as long as the tire inflation pressure

  the vehicle has a prescribed value An electronic processing unit connected to the transmitter provides the driver with information indicating that, when starting or even running, the tires are

  at the prescribed inflation pressure. This system of con-

  control of the known inflation pressure requires only a small inversion of equipment, which however produces a measurement result only when a wheel rotates, to be able to generate a pulse in the transmitter

  through the transducer.

  To control the inflation pressure of the unloaded wheels of an airplane, helicopter or similar aircraft, an additional device must be added to the known inflation pressure control system.

for motor vehicles.

  The object of the invention is to use a known system, controlling the inflation pressure when the wheel rotates, for a control of the inflation pressure of

aircraft wheels without load.

  To achieve this objective, according to the invention, the aircraft wheel comprises a rotation device intended to

  generating at least one pulse in the transmitter.

  Other advantageous features of the invention

will also be described.

  The main advantages obtained by the invention consist in that at the cost of a reduced structural investment, a known deflation pressure control system is applied to aircraft wheels, and also in that it can be simple retrofit The rotation of the wheel necessary to generate a signal in the system transmitter for the purposes of a control measure shall preferably be carried out without load, ie before the airplane by means of a rotation device The latter makes it possible to perform at least one wheel rotation to generate the pulse on the transmitter, so that a perfect control of the inflation pressure is achieved before the wheel

be loaded.

  Non-limiting exemplary embodiments of the invention will now be described in detail with reference to the accompanying drawing of which: FIG. 1 schematically represents the system for controlling the inflation pressure, comprising a transducer and a sensor, as well as a treatment group; Figure 2 is a side view of a wheel, the rotating device being constituted by rotating blades; Figure 3 schematically shows the wheels

  of an airplane placed in a landing gear, to

friction.

  FIG. 1 shows a representation of

  principle of a system of control of the pressure of gon-

  flage l for an airplane wheel 2 The system 1 com-

  carries a transducer 3 which cooperates with a transmitter 4 and is connected to an indicator 6 via a

treatment group 5.

  The transducer 3 is made, for example, under

  the shape of a diaphragm pressure switch and connected to the wheel.

  At a certain distance from it, one finds the trans-

  director 4 realized, for example, in the form of a

  HF transmitter and rigidly connected to the aircraft.

  For the system 1 to work, it is necessary that the wheel performs at least one revolution At each wheel revolution, a pulse is generated in the transmitter 4 by

  transducer 3 which includes a manometer

  contactor, when the prescribed inflation pressure prevails in the wheel 2 If, on the other hand, the pulses are absent, this indicates an inflation pressure that is too low, and a corresponding signal is indicated to the personnel

on the indicator.

  To rotate the wheel 2 of the aircraft, in order to control its inflation pressure, said wheel 2 comprises

  a rotation device 7 or 8 The device 7 comprises

  carries radial vanes arranged laterally with respect to the wheel 2 which, when the landing gear is out are subjected to the relative wind L and rotate the wheel, as if it rolled on the ground in the direction F.

  In addition, the rotation device can be

  In this embodiment, friction bearings are provided in the housing 10 of the landing gear of the aircraft. They co-operate with the retracted wheels 2 which are in direct contact with the rollers. When the landing gear is retracted, FIG. 3 shows a basic diagram of this rotation device 8, the friction rollers also being able to be arranged in another way with respect to the wheel. friction 11 is performed by means of an engine

electric 12.

  In addition, the rotation device can also be constituted by a motor placed in the hub, that

  we have not represented in more detail.

253584 th

Claims (4)

  1 Wireless control device for the inflation pressure of aircraft wheels in the unloaded state, which includes a stationary transmitter group and a transducer attached to the wheel at a distance from the preceding one, generating in the transmitter through the air gap   pulses picked up by an electrotherapy group   at a prescribed pressure, characterized in that the airplane wheel (2) comprises a rotation device (7, 8) for generating at least one pulse in the transmitter (4).   2 Device according to claim 1, characterized in that the rotation device (7) comprises blades (9) placed on the wheel (2) of the aircraft, on which acts the relative wind L when the landing gear is out.   3 Device according to claim 1, characterized in that the rotation device (8) comprises a   electric motor placed in the hub.   4 Device according to claim 1, characterized in that the rotation device (8) comprises a   friction roller (11) placed in the housing (10) of   landing gear and driven by a motor (12), which cooperates with the wheel (2) of the aircraft and rotates it,   when the landing gear is still retracted.