Six-bar mechanism and its expandable modules, extension arms, and planar deployment trusses

Abstract

The invention belongs to the technical field of aerospace equipment and provides a six-rod mechanism, an extensible module, an extension arm and a plane extension truss. The six-rod mechanism can movealong a determined route only through a driving part, and thus the degree of freedom of the six-rod mechanism is one. Various overall mechanisms composed of the six-rod mechanism can extend or retract in two directions, and coupling is achieved on movement in the two directions. A certain functional relationship is achieved, no voluntary movement exists, and thus the degree of freedom of the overall mechanisms composed of the six-rod mechanism is also one. Thus, use of constraint parts is reduced, the quality of the overall mechanisms is improved, and the retracted size is decreased; and meanwhile, the rigidity of the overall mechanisms is high because of the over-constraint characteristics of a spatial mechanism. The overall mechanisms further have pretty good structural symmetry, extension in the two directions in a plane is easy to achieve, and thus the six-rod mechanism can be applied to a spatial extension arm, a solar battery array truss and a large satellite plane extension antenna supporting truss of the aerospace field.

Description

technical field [0001] The invention belongs to the technical field of aerospace equipment, and in particular relates to a six-bar mechanism and an expandable module, an extension arm and a planar expansion truss composed of the six-bar mechanism. Background technique [0002] With the rapid development of technologies such as satellite communications, space science, deep space exploration, and earth observation, the application requirements for large-scale, lightweight, and high-folding ratio space deployment mechanisms have become increasingly urgent. With the increase of the size of the space structure, the storage space of the current aerospace vehicle can no longer meet the requirements of the large-scale space structure, so it is urgent to design a large-scale space mechanism that can realize the function of folding and unfolding, that is, during the transportation and launch phase of the rocket, the large-scale The aerospace mechanism can be folded together to maintai...

AI Technical Summary

Problems solved by technology

Existing spatial expansion mechanism schemes are mostly composed of planar mechanism modules, which have the following disadvantages: 1. There are many rods in the mechanism, and the folding ratio is not high; 2. There is more freedom inside the mechanism, and generally a synchronous mechanism or additional drives are used. The method of number reduces the degree of freedom of the mechanism, but this causes the increase of the quality and the volume of the mechanism; 3. The large-scale space expansion mechanism composed of planar mechanisms has low stiffness, and the mechanism is difficult to lock at the same time

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