Automatic rotor wing folding system for tandem double-rotor-wing helicopter

Abstract

The invention discloses an automatic rotor wing folding system for a tandem dual-rotor wing helicopter; the system comprises a vertical rotating shaft having the top fixed with propeller hubs, a plurality of blade assemblies uniformly distributed and hinged to the peripheral side of the propeller hub, multiple driving hydraulic cylinders fixedly connected with the multiple propeller hubs in a one-to-one correspondence mode, and having telescopic ends fixedly connected with the roots of the blade assemblies, a hydraulic oil tank fixedly connected with the bottom end of the vertical rotating shaft, having the internal space being a hydraulic oil cavity with an open bottom end, and internally provided with a piston assembly, a plurality of hydraulic oil conveying pipes having one ends communicated with the top end of the hydraulic oil cavity, and the other ends connected with a cylinder barrel of the driving hydraulic cylinder, and anelectric push rod having the telescopic end abutted against the bottom of the piston assembly. The folding system realizes folding of the paddle through the electric push rod, the hydraulic oil tank and the driving hydraulic cylinder, and is simple in structure, low in manufacturing cost, few in electric control element and easy to mount and control.

Description

technical field [0001] The invention relates to the technical field of helicopters, in particular to an automatic rotor folding system for tandem twin-rotor helicopters. Background technique [0002] The rotor system in the tandem dual-rotor helicopter is two pairs of rotors arranged in tandem, front and rear, and turning to the opposite direction. For heavy-duty helicopters, the arrangement of tandem dual-rotors is conducive to reducing the weight of the main reducer and rotors. At the same time, the volume of the cargo compartment can be further expanded, making it possible to load large cargo. However, the tandem dual-rotor design will cause problems such as excessive space occupied by the propellers. [0003] In order to reduce the space occupied by the blades of existing helicopters, the blades are generally designed to be foldable, that is, when the helicopter is not in use, the blades can be folded and stowed to reduce the space occupation rate. When the helicopter ...

AI Technical Summary

Problems solved by technology

However, the folding structure of the rotor is relatively complicated, requiring the cooperation of the mechanical structure and the corresponding sensors to realize the folding of the rotor, the manufacturing cost is high, and there are many electrical components, which increases the complexity of the control system and installation

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