Aircraft buffer variable damping oil needle

Abstract

The invention belongs to an airplane buffer technology, and relates to a variable damping oil needle of an airplane buffer. The variable damping oil needle of the airplane buffer is a cylindrical needle body, and a plurality of grooves which are longitudinally distributed are formed in the outer surface of the needle body. From an initial segment, the four grooves used as control points are axially formed on the outer surface of the needle body, wherein the parameter of the sectional area of the oil needle on the initial segment is 1.07f. The first groove is located in the 0.27L position, wherein the parameter of the sectional area of the oil needle is 1.07f. The second groove is located in the 0.57L position, wherein the parameter of the sectional area of the oil needle is 0.96f. The third groove is located in the 0.8L position, wherein the parameter of the sectional area of the oil needle is 0.615f. The fourth groove is located in the 0.9L position, wherein the parameter of the sectional area of the oil needle is 0.48f. The parameter of the sectional area of the oil needle at the tail end is 0.3f. L is the structural stroke of the buffer, and f is the set oil hole area generated when two peak values of a perpendicular load are kept equal. According to the variable damping oil needle of the airplane buffer, a sunken area between the two peak values of the perpendicular load can be eliminated, the load becomes gentle, a work amount curve of the buffer is full, efficiency coefficients are increased to 80% and far exceed efficiency coefficients in an existing level, and the remarkable technical effect is achieved.

Description

technical field [0001] The invention belongs to the aircraft buffer technology, and relates to a variable damping oil needle of the aircraft buffer. Background technique [0002] For ordinary small aircraft buffer damping devices, the damping device in the form of a single oil hole is generally used, but for large aircraft buffers, the efficiency of the single oil hole damper is low, and the oil needle variable damping device is generally used. The oil needle variable damping device can Improve the efficiency of the buffer, but what kind of variable damping coefficient can maximize the efficiency of the buffer has not been studied in depth. [0003] At present, small aircraft buffers at home and abroad use a single oil hole damping device. The damping parameter is a constant, and the vertical load curve has a sag between the two peaks, which affects the energy absorption of the buffer, resulting in low efficiency of the buffer. For the oil needle damping device mainly used ...

AI Technical Summary

Problems solved by technology

[0002] For ordinary small aircraft buffer damping devices, the damping device in the form of a single oil hole is generally used, but for large aircraft buffers, the efficiency of the single oil hole damper is low, and the oil needle variable damping device is generally used. The oil needle variable damping device can Improve the efficiency of the buffer, but what kind of variable damping coefficient can maximize the efficiency of the buffer has not been studied in depth

[0003] At present, domestic and foreign small aircraft buffers use a single oil hole damping device, the damping parameter is a constant, and the vertical load curve has a sag between the two peaks, which affects the energy absorption of the buffer, resulting in low efficiency of the buffer

For the oil needle damping device mainly used in large aircraft buffers, the lower end of the oil needle is fixed in the piston rod, the oil needle has a smooth conical cross-section, and the gap between the oil needle and the plunger forms the oil passing area of ​​the damping device. For this variable damping The structural form of the device, the variable damping parameter curve is monotonous, which cannot fully improve the efficiency of the variable damping buffer, and it is difficult to adjust the variable damping parameter during the drop test, requiring repeated repairs

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