Rotor wing variable propeller pitch mechanism of UAV (Unmanned Aerial Vehicle)

Abstract

The invention provides a rotor wing variable propeller pitch mechanism of a UAV (Unmanned Aerial Vehicle). The rotor wing variable propeller pitch mechanism is provided with a hollow main shaft; rotorwings of the UAV are fixedly arranged on the upper end of the hollow main shaft and are driven to rotate to generate a lift force by the hollow main shaft; a variable pitch control rod is arranged atthe inner part of the hollow main shaft; the upper end of the variable pitch control rod is rotationally connected with a force transfer arm support which is relative to the variable pitch control rod and can move up and down along with the variable pitch control rod; the force transfer arm support drives eccentric arms of the rotor wings to drive the rotor wings to rotate around installation axis of the rotor wings through force transfer arms so as to change incidence angles of the rotor wings. According to the rotor wing variable propeller pitch mechanism provided by the invention, the variable pitch control rod is arranged at the inner part of the hollow main shaft, space for installing a variable pitch mechanism is not required to be reserved between the rotor wings and cantilevers, and the height of the hollow main shaft stretching upwards from the cantilevers can be lessened as possible, so that the structure weight is greatly reduced, and effective load carrying ability of theUAV is increased.

Description

technical field [0001] The present invention relates to the technical field of unmanned aerial vehicles, in particular to a multi-rotor unmanned aerial vehicle, and in particular to an unmanned aerial vehicle rotor pitch-variable mechanism. Background technique [0002] Unmanned aircraft, referred to as "UAV", is an unmanned aircraft controlled by radio remote control equipment and its own program control device. According to the application field, UAV can be divided into military and civilian. In terms of military use, UAVs are divided into reconnaissance aircraft and target aircraft. Civilian drones are widely used in aerial photography, agriculture, plant protection, micro-selfies, express delivery, disaster relief, observation of wild animals, monitoring of infectious diseases, surveying and mapping, news reports, power inspections, disaster relief, film and television shooting and other fields. [0003] Existing multi-rotor drones are usually electric drones. The str...

AI Technical Summary

Problems solved by technology

However, in this prior art, since the main shaft needs to be sleeved with upper and lower sliders, the height of the main shaft protruding upward from the cantilever is too large, the main shaft needs higher strength, greater weight, and the diameter of the main shaft is also large.

The sliders of various hollow structures arranged around the main shaft become larger as the diameter of the main shaft becomes larger. In addition, as the length of the main shaft becomes longer, the stroke of the connecting rod for controlling the variable distance will also become larger, and the steering gear needs to be replaced. Maneuvering at a large angle is prone to lockup, and because the connecting rod connecting the steering gear is too far away from the manipulated object, the connecting rod mechanism is very complicated, and its reliability will undoubtedly be reduced a lot, and the structural weight will also become very heavy. Big

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