A ring truss type large space expandable mechanism

Abstract

The invention provides an annular truss-type large space foldable mechanism which is formed by connecting a plurality of identical 6R mechanism foldable units in an end-to-end mode and in an annular mode. The 6R mechanism foldable units can be symmetrical in the longitudinal direction and in the transverse direction. Each 6R mechanism foldable unit comprises two identical supporting rods and four identical chord members, wherein the two supporting rods are longitudinally arranged in parallel; the four chord members include two upper chord members and two lower chord members, the starting ends of the two upper chord members are connected to the upper ends of the two supporting rods through a revolute pair respectively, the tail ends of the two upper chord members are mutually connected through a revolute pair, the starting ends of the two lower chord members are connected to the lower ends of the supporting rods through a revolute pair respectively, the tail ends of the two lower chord members are mutually connected through a revolute pair, each chord member is movably connected with the adjacent supporting rod through a sliding block crank mechanism, sliding blocks are arranged on the supporting rods in a sleeved mode, one end of each crank is connected with the corresponding chord member through a revolute pair, the other end of each crank is connected with the corresponding sliding block through a revolute pair, and the length of the supporting rods is more than twice that of the chord members. The annular truss-type large space foldable mechanism has a high foldable ratio.

Description

technical field [0001] The invention belongs to the technical field of aerospace equipment and equipment, and relates to an annular truss-type single-degree-of-freedom mechanism, which can be used for satellite parabolic antennas and large space reflector support trusses. Background technique [0002] With the rapid development of satellite communication, deep space exploration, and earth observation technology, the application requirements for aerospace agencies have become more and more urgent. The size of the actually required spaceflight mechanism is getting bigger and bigger, and the precision is getting higher and higher. However, due to the limitation of the carrying space of the space vehicle, it is required that the spaceflight mechanism must be folded and folded in the fairing during the launch stage. After entering the orbit, it will be deployed to the working state by its own power source. The space expandable mechanism has the function of repeatable expansion a...

AI Technical Summary

Problems solved by technology

This scheme is simple to unfold and has a single driving source, but due to the presence of multiple sets of bevel gear meshes, the cost of processing and assembly is relatively high, and the folding ratio of this scheme needs to be improved

Relevant scientific research institutions in my country have carried out a series of forward-looking research work on spatially expandable mechanisms and achieved certain results, but no large-scale and complex spatially expandable mechanisms have been put into application yet.

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