Unidirectional-movement expandable symmetric coupling mechanism of icosahedron

Abstract

The invention discloses a unidirectional-movement expandable symmetric coupling mechanism of an icosahedron. The mechanism comprises twenty-two joints, forty connecting rods and twenty faces. The twenty-two joints comprise two regular pentagons, ten rhombuses and ten regular triangles. The included angles between the adjacent axes of five rotary pairs on each regular pentagon are 108 degrees, the included angles between the adjacent axes of four rotary pairs of each rhombus are 90 degrees, and the included angles between the adjacent axes of three rotary pairs of each regular triangle are 60 degrees. Branch structures of the mechanism are the same in composition and are distributed symmetrically, joint components are composed of triangles, quadrangles and regular pentagons, and the diversity of the coupling mechanism is enriched. The mechanism can achieve unidirectional movement and movement of contraction and expansion towards the geometric center and belongs to a polyhedron expandable coupling mechanism. If the mechanism is improved, a framework of an umbrella or a tent can be utilized, expanding and closing are achieved according to work conditions and environment requirements, transportation is facilitated, and the mechanism can better adapt to special occasions and has good application prospects.

Description

technical field [0001] The invention is a single-moving multi-ring expandable symmetric coupling mechanism, which relates to the technical field of mechanism application, in particular to the field of aerospace robots with an expandable folding mechanism. Background technique [0002] With the continuous development of mechanisms from simple to complex, from plane to space, and from single loop to multiple loops, mechanism innovation has always been the key and research hotspot of machine equipment innovation. The existing parallel mechanism has the advantages of strong bearing capacity, high rigidity, and low inertia, but the working space is limited; the series mechanism has a large working space, simple and smart structure, but low strength, and is not suitable for heavy-duty occasions. In such a development trend, the hybrid organization came into being. This kind of mechanism effectively combines the advantages of series mechanism and parallel mechanism, while breaking...

AI Technical Summary

Problems solved by technology

The difference in structure from the parallel mechanism determines that the existing configuration synthesis theory is not applicable to the multi-ring coupling mechanism, which greatly limits the coupling mechanism, especially the proposal of a new polyhedral coupling mechanism

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