A coaxial unmanned helicopter main transmission structure

Abstract

The invention provides a coaxial type unmanned helicopter main driving structure, belongs to the technical field of air vehicles, and aims at solving the problems in the prior art that a main driving chain is long, the transmission is not stable and the volume mass is great. A synchronized reversing mechanism comprises an inner shaft, an outer shaft, an inner sleeve assembly, an outer sleeve assembly and a driving bracket, wherein the inner shaft and the outer shaft are hollow shafts, and are coaxially sleeved; the outer sleeve assembly is fixedly connected with the outer shaft; the inner sleeve assembly is fixedly connected with the inner shaft; a roller which is positioned by the driving bracket is arranged between the inner sleeve assembly and the outer sleeve assembly; the inner sleeve assembly and the outer sleeve assembly are in eccentric structures; the roller is tangent to the inner ring surface of the outer sleeve assembly and the outer ring surface of the inner sleeve assembly respectively; the upper end of the inner shaft is fixedly connected with an upper rotor wing mechanism, and the upper end of the outer shaft is fixedly connected with a lower rotor wing mechanism; the upper rotor wing mechanism and the lower rotor wing mechanism commonly provide a lifting force; the lower end of the inner shaft is fixedly connected with an output shaft of a brushless motor by a plum-blossom-shaped shaft coupler; and the lower end face of the brushless motor is fixedly connected with the lower end face of a main supporting frame.

Description

technical field [0001] The invention belongs to the technical field of aircraft, and in particular relates to a main transmission structure of a coaxial unmanned helicopter. Background technique [0002] Since the coaxial unmanned helicopter has no tail rotor and relies on the upper and lower rotors to reverse at the same speed, it has a compact structure, symmetrical aerodynamic layout and high hovering efficiency, and is widely used in various fields. In the prior art, in order to achieve coaxiality, the two hollow shafts are generally fitted inside and outside; while the same-speed reversing is realized through bevel gear or planetary gear train transmission. Such a gear transmission scheme limits the overall size of the drone. With the development of modern reconnaissance and detection needs, micro-coaxial drones have quickly occupied a place with their unique advantages. However, its main drive scheme has always limited its volume and mass. The existing electric coax...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to propose a coaxial unmanned helicopter main transmission structure, which solves the problems of long main transmission chain, unstable transmission, and large volume and mass in the prior art, and establishes a simple and practical coaxial and same-speed reverse drive structure. Transfer institution

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