Buffering performance mechanism for oil needle type buffer

Abstract

A buffering performance mechanism for an oil needle type buffer comprises a buffer outer barrel, a fork ear shaped support, a joint bearing, a bolt connecting assembly, a plunger piston, a piston, a piston rod, a sealing device, a locking nut and an oil needle rod, wherein the plunger piston is connected to the buffer outer barrel through a spherical surface of the joint bearing, the bolt connecting assembly and the fork ear shaped support; the joint bearing is connected to the fork ear shaped support through the bolt connecting assembly; the fork ear shaped support is in threaded connection with the buffer outer barrel and enables the plunger piston to freely rotate around the buffer outer barrel; the piston is arranged between the buffer outer barrel and the piston rod; the sealing device is arranged between the buffer outer barrel and the piston rod and is locked through the locking nut; the oil needle rod is positioned into a hole in the plunger piston, and one end of the oil needle rod is fixed to the bottom end of the inner hole of the piston rod. According to the mechanism, the change of an oil running ring is reduced, so that the stable and high-efficiency buffering performance is realized; and meanwhile, the abrasion caused by contract between the plunger piston and the oil needle rod is avoided, and thus the service life of the oil needle rod is prolonged.

Description

technical field [0001] The invention relates to the technical field of aircraft landing gear buffers, in particular to a buffer performance mechanism of an oil needle type buffer. Background technique [0002] The cushioning function of the oil needle buffer of the aircraft landing gear is mainly realized by the fluid resistance generated by the small annular gap formed between the fluid flowing through the plunger and the oil needle rod. When the pillar is compressed, the oil needle rod passes through the hole of the plunger to form an oil-passing ring, and the oil inside the pillar generates resistance through the oil-passing ring, consumes energy, and realizes the buffering function. The performance of the buffer mainly depends on the area and shape of the annular gap. In the buffer performance test, it is usually achieved by adjusting the shape and geometric dimensions of the oil needle rod, that is, adjusting the area and shape of the oil passage ring. [0003] In the...

AI Technical Summary

Problems solved by technology

When the central axis of the oil needle rod coincides with the central axis of the plunger, an optimal and stable oil passage ring can be obtained, but due to manufacturing errors, installation errors, and the shaking of the oil needle rod itself (when the stroke of the buffer is large or the oil needle The impact is more obvious when the rod is relatively slender), in fact, the annular oil hole formed by the oil needle rod and the plunger is always variable, resulting in variable cushioning performance (the performance difference is 2.5 times in the extreme case of theoretical calculation), and deviates from the maximum optimal steady state

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