Drum brake device for small aircraft and working method

Abstract

The invention discloses a drum brake device for a small aircraft and a working method. The brake device comprises a base and two brake shoes installed on the base through a floating support. A drivingmechanism used for driving the two brake shoes to be away from each other is installed between the two brake shoes, the driving mechanism comprises an amplifying mechanism, and the amplifying mechanism comprises a displacement input end, a displacement output end used for driving the two brake shoes and a piezoelectric stacking assembly used for driving the displacement input end. The brake device outputs a displacement to generate a required brake force after electric signals are applied to two ends of the piezoelectric stacking assembly, weight of the aircraft is reduced, brake efficiency is improved, a corresponding speed of the piezoelectric stacking assembly is higher than that of an electro-hydraulic actuating mechanism, a defect that a traditional drum-type brake system is slow inresponse is overcome, a brake reaction is improved, and the device can be applied to small aircrafts with quite strict limitation on a size and the weight of the brake device.

Description

technical field [0001] The invention relates to an aircraft brake device, in particular to a drum brake device for small aircraft. Background technique [0002] Friction brakes can be divided into drum type and disc type according to the shape of their rotating elements. Disc type brakes are widely used in passenger cars because of their excellent heat dissipation and drainage properties. Compared with the disc brake form, the drum brake form was first used in the brake system. The manufacturing technology is relatively more mature and the cost is low. Power is stronger. However, in traditional drum brakes, the diameter of the drum of the drum brake will increase after being heated, causing the stroke of the brake pedal to increase, the pedaling force during braking is difficult to control, and the response of the braking system will slow down. , it is prone to the situation that the braking response is not as expected, which is not conducive to high-frequency braking acti...

AI Technical Summary

Problems solved by technology

However, in traditional drum brakes, the diameter of the drum of the drum brake will increase after being heated, causing the stroke of the brake pedal to increase, the pedaling force during braking is difficult to control, and the response of the braking system will slow down. , it is prone to the situation that the braking response is not as good as expected, which is not conducive to high-frequency braking action

At present, all drum brake devices are provided with hydraulic devices to provide power to the brake wheel cylinders so that the brake shoes open the friction plates and brake drums to generate braking force to achieve braking, but the power provided by the hydraulic devices to the brake wheel cylinders When the device is in use, it has the characteristics of slow response and inertia, which affects the emergency braking effect. At the same time, if the sealing effect of the sealing ring is not good, it will affect the braking effect

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