Built-in extension-type landing buffering mechanism

Abstract

The invention provides a built-in extension-type landing buffering mechanism which comprises a first stage piston cylinder, a second stage piston cylinder, a third stage piston cylinder and a fourth stage piston cylinder. An air cavity connected with the top of the first stage piston cylinder is formed in the first stage piston cylinder, an oil cavity is formed in the lower end of the air cavity, and an overflow valve is arranged between the air cavity and the oil cavity. An opening is formed in the upper end of the second stage piston cylinder, the second stage piston cylinder is arranged in the first stage piston cylinder, the lower end of the second stage piston cylinder is connected to a buffering component, and a first buffering material is arranged in the second stage piston cylinder. The first stage piston cylinder and the second stage piston cylinder are located in the third stage piston cylinder, and can move up and down and be locked inside the third stage piston cylinder. The fourth stage piston cylinder is connected to the top of the third stage piston cylinder, a push rod is arranged in the fourth stage piston cylinder, and the lower end of the push rod is arranged on the bottom of the inner portion of the air cavity. According to the built-in extension-type landing buffering mechanism, an oil-air buffering mode is adopted, quite high impact energy can be absorbed, the built-in extension-type landing buffering mechanism can be matched with aluminum honeycomb crushing energy absorption at the same time, and the buffering effect is more efficient. In addition, the built-in extension-type landing buffering mechanism further has the function of unfolding and locking, and can be used repeatedly.

Description

technical field [0001] The invention relates to the technical field of buffer mechanism design, in particular to a reusable vertical take-off and landing built-in retractable landing buffer mechanism for aircraft. [0002] Background technique [0003] The design of the landing buffer mechanism is of great significance to the safety of the structure. Generally, the landing buffer mechanism used for the vertical take-off and landing of the aircraft is composed of two separate parts: the deployment locking device and the landing buffer device. The independent design of the deployment locking device and the landing buffer device will cause defects such as reduced reliability of the overall mechanism and increased weight. The landing buffer mechanism is the key and core component of the soft lander of the aircraft. The selection and design of the buffer and energy-absorbing components is the key to achieving a stable, reliable and safe soft landing. Its main function is to abs...

AI Technical Summary

Problems solved by technology

The airbag buffer device bounces many times and rolls after landing, and the attitude is not suitable for control, and the attitude cannot be adjusted; the hydraulic buffer device needs strict sealing and thermal protection measures in a vacuum, the structure is complex, the weight is large, and the reliability is low; the compressible suction The energy buffering device mainly adopts aluminum (or paper) honeycomb structure and honeycomb structure filled with foam molding as the buffer material. The buffer damping performance of the aluminum honeycomb buffer is unstable, and the force is not easy to control. The biggest disadvantage is that the honeycomb aluminum cannot be deformed. Reply, cannot be reused

The mass of the electromagnetic buffer mechanism is too large, the structure is complex, and it is easily affected by the failure of the power supply system

Magnetorheology is still in the development stage in the aerospace field, and the technology is not mature enough

The mechanical buffer device is mainly a friction braking method. The buffer using the friction braking method has a large wear on the structure. At the same time, a large amount of heat will be generated during the friction buffering process, and the buffering effect is not very good.

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