Folding mechanism for changing the span of the wing

Abstract

The invention discloses a folding mechanism for changing wingspan of wings. The folding mechanism is a rigid foldable structure which is used for changing the single degree of freedom and the large folding-expanding ratio of the wingspan of the wings based on a Sarrus mechanism. The single degree of freedom guarantees that the entire wings only need a driving motor, complexity caused by coordination and cooperation of a plurality of motors is avoided, besides, the self weight of the folded wings is greatly reduced, and the effective load of an aircraft is increased; the large folding-expanding ratio guarantees that the respects including the speed, the mobility, the loading capacity, the range and the like of the aircraft can be adjusted according to task requirements. Through the adoption of the mechanism, the wingspan of the wings is changed, the diversified functions of the aircraft can be realized, the performance indexes of the aircraft can be regulated, and enormous convenience is brought for the storage and the transportation of the aircraft; the entire mechanism only has one degree of freedom, so that the motion control is simple; the folding mechanism has the advantages of being simple to produce and process, convenient in motion control, high in reliability, high in precision and the like, and has important significance and broad application prospects in the field of variable geometry aircrafts.

Description

technical field [0001] The invention relates to a folding mechanism for changing the wingspan of an aircraft wing, in particular to a rigid folding mechanism with a single degree of freedom and a large folding-span ratio that realizes the continuous change of the wingspan of an aircraft by a single drive. Background technique [0002] After the Wright brothers successfully used ropes to control the twist angle of the wings, the world's first shape-shifting aircraft appeared. In recent decades, the technology of transforming aircraft has developed rapidly. In terms of the development of deformed aircraft, the United States has always been at the forefront of the world. In 2003, the U.S. Defense Advanced Research Projects Agency (DARPA) launched the "Deformed Aircraft Structure" project, and at the same time gave the deformation standards of the aircraft: the aspect ratio changes more than 200%; the wing area changes more than 50%; the wing front Edge sweep angle changes gre...

AI Technical Summary

Problems solved by technology

Each type of folding aircraft has its advantages and disadvantages. The barrel-type folding wing can ensure a large expansion ratio, but the overall structure of the wing becomes very complicated, the stiffness is poor, and the wing will undergo serious unnecessary deformation, and Wing span is difficult to control precisely; rack-and-pinion and hydraulically driven folding wings can precisely control wing spread, but the added weight and power required are huge, greatly reducing the aircraft's payload and range ;The wings of the "Z-wing" small UAV require a large number of motors to cooperate with each other, which not only consumes energy and reduces the payload, but also increases the difficulty of controlling each section of the wing

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