Design And Application For A Scaling Mechanism Based On Butterfly Element

Butterfly Mechanism consists of two congruent equilateral triangles. While reversely rotating the two triangles by a hinge on two corresponding vertices, the distance of the other corresponding vertices will be changed while the corresponding vertex angle remains the same in sports. The result is that a class of these butterfly mechanisms can enlarge or shrink a planar graph. This theory is brought into space in this paper, and the DOF of the spatial structure is analyzed then.These following points are composed in this paper.Firstly, by establishing the model of regular planar butterfly pantograph, features of these structures are analyzed and the specialty of them are synthesized. With the study of these features, it provides a new kind of irregular planar butterfly pantograph in this part. After the analysis and synthesis of the new structure, it makes a further explanation by illustrating the different use of them.Secondly, by the analysis of the planar butterfly pantograph, it uses these planar performances into space in this part, and provides the method of constructing the spatial butterfly pantograph. Then these structures are analyzed and synthesized by simulation software SolidWorks and ProE.Finally, a special vehicle with wheels, which can change their diameters is designed, by the analysis of the butterfly pantograph theory. On one hand, it can meet the requirements at any time to change the wheel diameter to accommodate the needs of complex terrain walking, so that the ability to change the wheel diameter from the department of wheel speed restrictions. On the other hand, the vehicle has a good strength to be able to have a certain degree of load capacity.