JPH09150796A - Aircraft wheel device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To decrease abrasion of a tire and prevent damage by providing an airspeed converting means for receiving an airspeed signal or a calculated optimum touchground speed signal, and outputting the airspeed signal on a runway, and a wheel rotating means for receiving the output of the airspeed converting means, and driving wheels to the number of revolution corresponding to the input. SOLUTION: When the airspeed is used, a pilot selects the (b) terminal side of a relay 11 by a switching unit. An IAS signal from an airspeed sensor 4, an atmospheric density signal from an atmospheric density sensor 5, a wind data signal from an ACARS6, and a nose azimuth signal from a horizontal azimuth sensor 7 are input to an airspeed converting device 8, and the airspeed signal on a runway is calculated and output. This signal is sent to a wheel rotating device 12. The wheel rotating device 12 receives the airspeed signal, and drives wheels so that the peripheral speed of the wheel may be close to the airspeed. The number of revolution is displayed on a display 13. Abrasions or damage of a wheel tire is, therefore, prevented when an aircraft lands on the runway.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aircraft wheel device that improves the safety of wheel tires when landing on an aircraft.

[0002]

2. Description of the Related Art There has been no conventional device for rotating wheels in advance during landing, which requires a rotational speed for maximizing the effects of reducing tire wear and preventing damage.

[0003]

However, the conventional aircraft wheel device has a problem in that it is not sufficiently effective in reducing tire wear and preventing damage.

[0004]

The present invention employs the following means to solve the above-mentioned problems.

That is, as an aircraft wheel device, a ground speed converting means for receiving an air speed signal or a calculated optimum ground speed signal and calculating and outputting a ground speed signal on a runway, and an output for receiving the ground speed converting means are compatible with the input. Wheel rotation means for driving at the specified rotation speed.

In the above, the ground speed converting means receives the air speed signal or the calculated optimum ground speed signal and outputs the ground speed signal on the runway. The wheel rotating means receives the ground speed signal and drives the wheel at a rotation speed such that the peripheral speed of the wheel becomes close to the ground speed.

In this way, the safety of wheel tires such as wear reduction and damage prevention when the aircraft lands on the runway is improved.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION

(1) A first embodiment of the present invention will be described with reference to FIG. The output of the IRS (Inertial Reference System) 1 is sent to the a terminal of the relay 11 via the adder 9. The output of the relay 11 is sent to the display 13 via the wheel rotating device 12.

Airspeed sensor 4, atmospheric density sensor 5, A
The outputs of the CARS (air data link system) 6 and the horizontal direction sensor 7 are the ground speed conversion device 8 and the adder 10.
Is sequentially sent to the b terminal of the relay 11. The output of the offset input device 3 is input to each of the adders 9 and 10. Further, the output of the switch 2 is sent to the relay 11.

In the above, for example, when using the airspeed, the pilot selects the b terminal side of the relay 11 by the switch 2. Then, the ground speed conversion device 8 inputs the IAS signal from the air speed sensor 4, the air density signal from the air density sensor 5, the wind data signal from the ACARS 6, and the heading signal from the horizontal heading sensor 7, and sends them to the ground on the runway. Calculates and outputs the speed signal. This signal is sent to the wheel rotating device 12. The wheel rotation device 12 receives the ground speed signal and drives the wheel at a rotation speed such that the peripheral speed of the wheel is close to the ground speed. Further, the number of rotations is displayed on the display unit 13.

In this way, the safety of wheel tires such as wear and damage when the aircraft lands on the runway is improved.

When the pilot uses the signal from the IRS1, the a terminal side of the relay 11 is similarly selected. Then, the ground speed signal in the traveling direction from the IRS 1 is sent to the wheel rotating device 12. The same applies hereinafter.

The pilot outputs the offset speed signal from the offset input unit 3 as necessary, and the adder 9 outputs the offset velocity signal.
Alternatively, 10 may be added. (2) A second embodiment of the present invention will be described with reference to FIG. The output of the pilot input device 17 is sent directly to the b terminal of the relay 11a and the a terminal via the TAS converter 14. The output of the relay 11a is sent directly to the b terminal of the relay 11b, and also to the a terminal via the ground speed conversion device 15. The output of the relay 11b is sent to the a terminal of the relay 11c.

The output of the offset input device 3 is sent to the b terminal of the relay 11c via the adder 9. The output of the relay 11c is sent to the display 13 through the primary filter 19 and the wheel rotation device 12 in order. Further, the output of the switch 2 is sent to each of the relays 11a to 11c.

The optimum ground contact speed calculation device 16 has flaps and slat state signals 20s and airframe weight signals 21s during grounding.
In response, the output is sent to the ground speed conversion device 8 and the display 18. The output of the ground speed converter 8 is sent to the adder 9.
The ACARS 6 signal and the runway data signal 22s are sent to ground speed converters 8 and 15, respectively.

In the above, for example, when the calculated optimum ground speed is used, the pilot selects the b terminal side of the relay 11c by operating the switching device 2. Then, the optimum ground contact speed calculation device 16 causes the flap and slat state signals 2 at the time of ground contact.
The optimum ground contact speed of the aircraft, that is, the minimum speed required to support the fuselage is calculated by inputting 0s and the airframe weight signal 21s, and the calculated optimum ground contact speed signal 16s is output.

The ground speed converter 8 calculates the optimum ground contact speed signal 16s and the runway data (altitude, direction, etc.) signal 22.
s and the standard atmospheric density signal and the wind data signal from ACARS6, and outputs the ground speed signal on the runway of the aircraft. This signal is gently changed by the primary filter 19 with a set time constant and sent to the wheel rotating device 12. Thereafter, the same operation as described above is performed.

In this case, unlike the first embodiment, since the output of the primary filter 19 changes gently, the output capacity of the rotation speed of the rotating device 12 can be reduced.
Further, in the normal case, the actual ground contact speed and the optimum ground contact speed are substantially equal to each other, so that the load applied to the wheels also has substantially the same effect as in the case of the first embodiment.

Input from the offset input device 3 is also possible in the same manner as described above.

When the pilot chooses the pilot input,
Similarly to the above, the terminal a side of the relay 11c is selected. Next, when the pilot input is used as it is, the b terminal side of the relays 11a and 11b is selected in the same manner as described above. Then, the pilot inputs the predicted ground speed from the pilot input device 17. This signal is sent to the wheel rotating device 12 via the primary filter 19. The same applies to the following.

As another option, the relays 11a, 11
Select the a terminal side of b, and the pilot is the pilot input device 1
When a signal corresponding to IAS (instructed ground speed) is input from 7, the TAS converter 14 calculates and outputs a true airspeed signal from this signal. Next, the ground speed converter 15 receives this signal, the runway data signal 22s, the standard atmospheric density signal and the wind data signal from the ACARS 6, and outputs the ground speed signal on the runway of the aircraft. Thereafter, the same operation as described above is performed. As another selection, the b terminal side of the relay 11a and the a terminal side of 11b are selected, and the pilot is TAS.
A signal corresponding to (true airspeed) may be input.

[0022]

According to the present invention as described above,
At the time of landing, the wheel tires are driven at a peripheral speed close to the ground contact speed of the aircraft in advance, so the safety against tire wear and damage during landing is greatly improved.

[Brief description of the drawings]

FIG. 1 is a configuration block diagram of a first embodiment of the present invention.

FIG. 2 is a configuration block diagram of a second embodiment of the present invention.

[Explanation of symbols]

 1 IRS 2 Switcher 3 Offset device 4 Airspeed sensor 5 Atmospheric density sensor 6 ACARS 7 Horizontal direction sensor 8 Ground speed conversion device 9,10 Adder 11, 11a-11c Relay 12 Wheel rotation device 13, 18 Indicator 14 TAS Conversion device 15 Ground speed conversion device 16 Optimal ground speed calculation device 17 Pilot input device 19 Primary filter

Claims (1)

[Claims] 1. A ground speed converting means for receiving an air speed signal or a calculated optimum ground speed signal and calculating and outputting a ground speed signal on a runway, and an output of the ground speed converting means for driving at a rotation speed corresponding to an input. An aircraft wheel device, comprising: