Space folding and extending mechanism with five-rod mechanisms as extensible units

Abstract

A space folding and extending mechanism with five-rod mechanisms as extensible units comprises an octagonal support base, three-degree-of-freedom hinges, pin shafts, bevel-edge rods, L-shaped rods, short rods and straight-edge rods. The octagonal support base is fixedly connected with the three-degree-of-freedom hinges, the bevel-edge rods are connected with the corresponding three-degree-of-freedom hinges through revolute pairs, the bevel-edge rods, the L-shaped rods, the short rods and the straight-edge rods are connected through the pin shafts, and the straight-edge rods are connected withthe corresponding three-degree-of-freedom hinges through revolute pairs. In the space folding and extending mechanism, each rod is composed of two rod bodies, movement pairs are all the revolute pairs, the structure is simple, the space folding and extending mechanism can be driven by motors, and the extending speed can be controlled through motor driving, and each extensible unit is high in stability and synchronism; the space folding and extending mechanism has the advantages of being low in mass, large in folding ratio, high in positioning precision, high in structural strength, high in stability and reliability, simple in structure and low in manufacturing cost, and the space folding process is simple.

Description

technical field [0001] The invention relates to a space folding mechanism, in particular to a space folding mechanism with a five-link mechanism as an expandable unit. Background technique [0002] With the development of the aerospace industry, the space expansion mechanism plays a pivotal role in space missions such as space stations, communication satellite platforms, space telescopes, earth observation, and planetary exploration. However, due to the space constraints of the space vehicle, this requires that the space deployment mechanism must be folded and folded in the fairing during the launch phase. After the spacecraft enters orbit, it will be deployed to the working state by its own power source. [0003] Chinese patent 201410055564.5 discloses a spatially expandable mechanism. The expandable unit of this patent is 10 rods and 10 pairs of mechanisms. The redundant degree of freedom of the mechanism is large and the stability performance is poor; Array expandable me...

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Problems solved by technology

[0003] Chinese patent 201410055564.5 discloses a spatially expandable mechanism. The expandable unit of this patent is 10 rods and 10 pairs of mechanisms. The redundant degree of freedom of the mechanism is large and the stability performance is poor; Array expandable mechanism, the space folding process of this mechanism is complicated, when the expandable mechanism enters the space orbit, it is difficult to unfold the mechanism into a predetermined structural form; Chinese patent 201210397908.1 discloses a regular tetrahedron symmetrical expandable mechanism unit, the mechanism Although the structure is simple and the weight of the components is light, the array of expandable cells is difficult and cannot achieve a large folding ratio.

[0004] At present, there is no invention and design of a space folding mechanism that has the characteristics of small mass, large folding ratio, high positioning accuracy, high structural strength, high stability, high reliability, simple structure, and a simple space folding process.

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