Expandable antenna mechanism of torsion spring driven shears-fork annular truss

Abstract

The invention discloses an expandable antenna mechanism of a torsion spring driven shears-fork annular truss. The mechanism comprises N folding and unfolding units with completely same structure, and the adjacent folding and unfolding units are connected by shared upper and lower flower discs to form a polygonal annular truss. Each folding and unfolding unit comprises two shears-fork rods, two groups of torsion spring driving assemblies, four connecting rods and four flower discs. All rotating pair axes on the shears-fork rods and the connecting rods in the same folding and unfolding unit are parallel. The mechanism has the characteristics of high rigidity, flexibility in motion and large folding ratio; and by adopting torsion spring driving, the whole mechanism is fast in unfolding and quick in response, and can be applied to communication satellites, space stations and space detectors.

Description

technical field [0001] The invention relates to a deployable antenna mechanism. Background technique [0002] The expandable mechanism originated in the 1960s. It is integrated with prefabricated units and can switch between the initial compact configuration and the expanded configuration in the working state. It generally has two stable states: a fully folded state and a fully expanded state ( working status). With the rapid development of manned spaceflight, earth observation, deep space exploration, and space communication, the size of space mechanisms required in various aerospace projects is getting larger and larger to meet the needs of different space missions. Due to the limitation of the effective space of the tool, it is necessary to design a space expandable mechanism with a large folding ratio. It is in a folded state during the launch and transportation stages and is folded in the fairing. After the spacecraft enters orbit, it will be deployed to the working st...

AI Technical Summary

Problems solved by technology

[0004] Large-scale deployable space-borne antenna is a key technology in the development of satellites. Missions such as electronic reconnaissance, data relay, and ground navigation put forward high-gain requirements for space-borne antennas. Directly increasing the reflector aperture is the best way to increase antenna gain. As an effective way, the existing space-borne deployable antennas mostly use hinged truss-type deployable mechanisms. Ring truss mechanisms are widely used, but there are fewer types of existing ring truss mechanisms, and they have low stiffness and drive Complexity, slow unfolding process and heavy driving motor mass

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