A landing gear buffer with extended stroke and variable oil hole

Abstract

This application belongs to the technical field of aircraft landing gear structure design, and in particular relates to a landing gear buffer with variable oil hole in the extension stroke, which can sequentially experience the first state, the second state, the third state, and the fourth state during the extension stroke And the fifth state, which skillfully utilizes the change of the relative position of the piston rod, the outer cylinder and its plunger during the elongation stroke, and realizes the oil change hole in the elongation stroke of the landing gear buffer through the combination of different oil holes, wherein, The area of ​​the combination of oil holes is the largest in the first state during the elongation stroke of the above-mentioned drop gear buffer, and the damping produced by it is the smallest, which can meet the requirements for rapid extension of the piston rod, and then it goes through the second state and the third state in sequence The area of ​​the combination of oil holes in the fourth state and the fifth state shows a downward trend, and the resulting damping tends to increase accordingly, which reduces the speed at which the piston rod extends.

Description

technical field [0001] The application belongs to the technical field of aircraft landing gear structure design, and in particular relates to a landing gear buffer with an extended stroke variable oil hole. Background technique [0002] Aircraft landing gear buffers are designed to absorb and dissipate the kinetic energy of an aircraft during landing and taxiing to ensure aircraft safety. Among them, the oil-air buffer has high working efficiency, safety and reliability, and is widely used in landing gear. It uses oil to flow through oil holes to generate damping to dissipate energy. [0003] At present, in order to fully dissipate energy, the compression stroke and extension stroke of the oil-air buffer are generally designed with oil holes to produce damping. The existing oil-air buffer mainly dissipates energy in the compression stroke, and the extension stroke consumes less energy. , generally has a fixed size oil hole, and maintains a fixed damping coefficient. Howeve...

AI Technical Summary

Problems solved by technology

However, in some special cases, when the landing gear buffer is required to have certain specific properties, the design of the above-mentioned oil-air buffer cannot meet the application requirements very well. The extension of the piston rod of the landing gear buffer provides it with an instantaneous pitch rate to complete the auxiliary take-off of the carrier aircraft. After the extension process is completed, the extension speed of the piston rod needs to be reduced, that is, the oil-air buffer needs to The damping at the beginning of the extension stroke is small to realize the protrusion of the piston rod, and the damping generated thereafter is relatively large to reduce the extension speed of the piston rod. The existing oil-gas buffer is in the process of extension stroke The big and bottom fixing of the middle oil hole obviously cannot meet the above requirements very well

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