JPH06255591A - Brake control method in landing gear - Google Patents

Abstract

PURPOSE:To secure safe and positive braking force in the landing gear of an aircraft or the like by detecting each braking force applied to many wheels by a braking torque sensor compact and easy to fit/remove. CONSTITUTION:A wheel bearing part 3 for bearing the axle 2 of a wheel 1 is provided with a flange 11 for mounting a brake 10 disposed being enclosed in the wheel 1, and the brake 10 is mounted through a strain gage sensor device formed of a ring member 12 with a strain gage sensor 12 fixed to the circumferential bottom part of U-shape cross section by epoxy resin. The distortion of the ring member 12 generated by braking is detected to compute the present braking torque quantity from the correlation between the previously obtained distortion quantity and braking torque quantity, and the control quantity of an actuator is changed accordingly to control in such a way as to obtain the specified braking torque.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention
According to the method of controlling the braking force provided on the landing gear, that is, the leg that can be extended, the brake torque sensor that is easy to attach and detach and has a small size detects each braking force applied to many wheels and controls it. And a brake control method for an landing gear that secures a safe and reliable braking force.

[0002]

2. Description of the Related Art For controlling hydraulic braking force provided in an aircraft landing gear, a distribution valve for evenly distributing pressure oil to a plurality of brakes, a control valve for releasing excess pressure oil, and the like are provided. . In the case of an aircraft with a landing speed of several 100 km / hr, a brake that incorporates an anti-skid system in the landing gear is usually used, and speed information from the speed sensor and deceleration information from the gravity sensor are used. Based on the above, the hydraulic braking force is controlled according to a preset hydraulic control program so as not to lock the wheels of the landing gear.

[0003]

An anti-skid system provided in a conventional aircraft landing gear has a plurality of hydraulic pressures based on speed information from a speed sensor, a deceleration sensor and a wheel speed sensor on the airframe side. The hydraulic pressure of the disc brake is controlled. In order to make the anti-skid system more efficient and reliable, it is desirable to individually grasp the braking force currently applied to each wheel of the landing gear and individually control a plurality of hydraulic disc brakes. . However, at present, in an aircraft landing gear, it is a means for individually grasping and controlling the braking force, and no control method has been proposed.

Further, in a magnetically levitated vehicle that is being put into practical use, a supporting leg device having the same structure as that of the landing gear is used in order to make the low-speed supporting wheels freely movable up and down. In this case, the number of wheels is greater than that of an aircraft, and the speed at the time of stepping out is a high speed of several 100 km / hr. Therefore, when controlling the brakes attached to a large number of wheels and incorporating an anti-skid system, the braking force is applied individually It is desired to grasp and control.

According to the present invention, in a landing gear of an aircraft or the like, a brake torque sensor which is easy to attach and detach and has a small size detects each braking force applied to a large number of wheels and controls the braking force to secure a safe and reliable braking force. An object of the present invention is to provide a brake control method for the landing gear.

[0006]

SUMMARY OF THE INVENTION The present invention relates to a brake control method for a landing gear, which controls a drive source so that a brake mounted on the landing gear has a predetermined braking torque, such as an axle of a non-rotating side member of the brake. Lightweight for mounting and fixing to
A compact strain gauge sensor device is arranged, and the strain gauge sensor device detects the strain generated in the mounting portion of the non-rotating side member on the axle etc. when the brake is actuated, and brakes based on the preset strain and braking torque. It is a brake control method for an landing gear, which is characterized by measuring a current braking torque during operation and controlling a drive source so as to achieve a predetermined braking torque. Further, according to the present invention, in the above structure, the strain gauge sensor device in which the strain gauge sensor is housed or stretched is connected and fixed between the non-rotating side member of the brake and the axle by a brake control of the landing gear device. Is the way.

In the present invention, in the case of a disc brake, for example, the strain gauge sensor device is provided at a mounting / fixing portion of a non-rotating side member such as a frame body supporting an actuator or a caliper to an axle or the like. Because of being affected by heat generation, it is necessary to mount the required number of strain gauge sensors having excellent high-temperature characteristics to the mounting and fixing portion or the dedicated mounting member with heat-resistant resin adhesive. The mounting and fixing part also takes various forms depending on the structure of the landing gear and the brake, but it is mounted on any part as long as it is a part where distortion due to braking torque during braking can be detected and which does not hinder rotation or braking. For example, a plurality of strain gauge sensors are arranged as required to form a strain gauge sensor device by arranging lead wires, and further, as in the embodiment, a cross section U is used as a connecting member on a brake mounting flange portion of a leg. There are various configurations depending on the structure of the landing gear and the structure of the adopted brake, such as mounting a brake via a ring member of the mold and disposing a strain gauge sensor in the ring member to configure a strain gauge sensor device. Can be adopted. The landing gear also has various configurations depending on the application such as aircraft and magnetically levitated vehicles, brakes are disc brakes and drum brakes, actuators are hydraulic,
Air or the like is appropriately adopted, but the present invention can be applied to any configuration.

In the present invention, the control of the drive source of the brake is such that the flow rate and pressure of hydraulic pressure, air, etc. are controlled by the known control device and control method according to the configuration of the adopted brake and actuator. However, the strain generated in the strain gauge sensor device installed between the non-rotating member such as the frame body that supports the actuators and calipers and the axle is caused by the braking torque generated by the brake. The drive source is controlled so that the current braking torque amount is converted from the strain detected by the gauge sensor and measured, and the planned braking torque is obtained. Therefore, by previously obtaining the correlation between the amount of strain generated in the mounting and fixing portion of the brake adopted in the landing gear and the amount of braking torque generated by the brake, the current strain is detected from the strain detected by the strain gauge sensor device. The braking torque amount can be converted, and this conversion is performed by a computer, the actuator is controlled by the controller, and any control method such as setting to directly control the actuator controller according to the distortion signal is adopted. You can

[0009]

The brake control method for the landing gear according to the present invention detects the strain generated in the mounting portion of the brake on the axle or the like, and measures the current braking torque at the time of brake operation from the preset relation between the strain and the braking torque. However, it is characterized by controlling the drive source so as to achieve the planned braking torque, the braking torque of the brake can be accurately controlled, and individual brakes are generated when controlling the brakes of a plurality of landing gears. The braking torque can be grasped in real time, and the anti-skid system can be made more efficient and reliable.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an explanatory view of a leg system for a magnetically levitated vehicle to which the brake control method for an landing gear according to the present invention is applied, as seen from the rear of the vehicle. In the leg device, the trailing arm 4 is coaxially supported on the pivot portion fixed to the vehicle bogie via the bracket, and the axle 2 of the wheel 1 is pivotally supported near the tip of the arm 4. The wheel shaft support 3 is formed. Further, the leaf spring 5 is pivotally attached to the pivot portion, and the tip end of the leaf spring 5 pivoting up stands up on the lever arm 6.
A bell crank-shaped suspension member is constituted by a leaf spring and a lever arm, and a lifting actuator 7 with an internal lock pivotally supported by the vehicle is pivotally connected to the lever arm 6 via a bracket. Further, the other end of the leaf spring 5 is connected to the tip of the trailing arm 4 via a link arm 8, and the axle 2 is suspended by the leaf spring 5 and the trailing arm 4. By operating the hoisting actuator 7, the wheel 1 suspended at the tip of the leaf spring 5 via the lever arm 6 is moved to the trailing arm 4
With the lever arm 6, it is possible to swing around the pivot portion as a fulcrum, so that the hoisting can be performed easily and surely.

A wheel shaft supporting portion 3 for supporting the axle 2 of the wheel 1 is provided with a flange portion 11 for mounting a brake 10 housed in the wheel 1 and a ring member 12 having a U-shaped cross section. The brake 10 is attached via the. A plurality of strain gauge sensors 13 are arranged at predetermined intervals on the circumferential bottom of the ring member 12 having a U-shaped cross section which constitutes the strain gauge sensor device, and here, the strain gauge sensors 13 are fixed with epoxy resin. The lead wire from 13 is connected to an arithmetic and control unit (not shown).

In the above structure, when the brake 10 is operated to perform the required braking, the ring member 12 is distorted in accordance with the generated braking torque, and the strain gauge sensor 13 housed in the ring member 12 is distorted. A strain signal is input to the arithmetic and control unit by detecting this strain, and the correlation between the strain amount generated in the mounting and fixing portion of the brake adopted in the landing gear and the braking torque amount generated by the brake is obtained in advance. As a result, the current braking torque amount can be converted from the strain detected by the strain gauge sensor, and the control amount of the actuator can be changed according to this conversion so that the braking torque can be controlled to a predetermined braking torque.

[0013]

EFFECT OF THE INVENTION As shown in the embodiments, a strain gauge sensor device which is easy to attach and detach and miniaturizes distortion generated in a mounting and fixing portion of a non-rotating member such as a frame body supporting an actuator, a caliper and the like to an axle or the like. Can be detected using, and by previously obtaining the correlation between the strain amount and the braking torque amount generated by the brake, by individually grasping the braking force currently applied to each wheel of the landing gear,
It is possible to provide a safer and more efficient brake control method such as individually controlling a plurality of brakes.

[Brief description of drawings]

FIG. 1 is an explanatory view of a configuration of a leg device for a magnetically levitated vehicle to which a brake control method for an landing gear according to the present invention is applied, as seen from the rear side of the vehicle.

[Explanation of symbols]

 1 Wheel 2 Axle 3 Wheel Shaft Support 4 Trailing Arm 5 Leaf Spring 6 Lever Arm 7 Lifting Actuator 8 Link Arm 10 Brake 11 Flange 12 Ring Member 13 Strain Gauge Sensor

Claims (2)

[Claims] 1. A brake control method for a landing gear, comprising controlling a drive source of a brake mounted on the landing gear so as to obtain a predetermined braking torque, wherein a strain gauge is mounted on a fixed portion of a non-rotating member of the brake mounted on an axle or the like. A sensor device is arranged to detect the strain generated in the mounting portion of the non-rotating member on the axle or the like when the brake is actuated, and the current braking torque at the time of brake actuation is measured from the relationship between the preset strain and the braking torque. A brake control method for an landing gear, comprising controlling a drive source so as to achieve a predetermined braking torque. 2. The brake control of the landing gear according to claim 1, wherein a strain gauge sensor device in which a strain gauge sensor is housed or stretched is mounted and fixed between a non-rotating member of the brake and an axle as a connecting member. Method.