A co-axis unmanned helicopter main transmission structure

A co unmanned helicopter main drive shaft belongs to the field of aircraft structures, it aims to propose solutions of the prior art main transmission chain length, transmission instability, large volume of quality problems. Same speed reversing mechanism according to the present invention includes an inner shaft, outer shaft, the sleeve assembly, the drive assembly and the outer bracket; inner shaft and outer shaft as a hollow shaft, and coaxial with sleeve housing assembly is fixedly connected with the outer shaft, the inner sleeve disposed between the assembly and the inner shaft is fixedly connected to the inner and outer sleeve assembly has a roller assembly via a transmission bracket positioned within the sleeve assembly and housing assembly are asymmetric structure, respectively, and the inner roller and the inner surface of the outer sleeve component assembly the cut surface of the outer ring; an inner end of the shaft means fixed on the rotor, and the lower end of the outer shaft fixed to the rotor means, the rotor means and the rotor means together to provide lift; lower inner shaft and an output shaft of the brushless motor by plum coupling fixedly connected; lower end face of the brushless motor fixed to the lower end surface of the main support frame.