Multi-stage passive bending mechanism based on variable cross-section cross reeds

Abstract

The invention relates to a multi-stage passive bending mechanism based on variable cross-section cross reeds. The two equal-length variable cross-section reeds are symmetrically connected with two adjacent curved face free ends in a staggered manner in the length direction to form the first stage, and the cross section of each reed is thinnest at the crossed point and is thickest at the position connected with the corresponding free end. According to the curved face free ends in the scheme, the crossed points of the cross reeds and cross reed units are overlapped with respect to the circle center of the free end of the outer side of an entire bending mechanism, so that when each cross reed unit is passively bent and deformed, the offset of each intersection is reduced, and the deformationaccuracy is higher. The variable cross-section cross reed units are adopted, that is, the cross section of each reed is thinnest at the intersection and is thickest at the portion connected to the corresponding free end, so that greater passive deformation is achieved under the condition that deformation accuracy is ensured, and the deformation accuracy of the cross reed units in the scheme is higher under the same deformation degree.

Description

technical field [0001] The invention belongs to the field of multi-stage passive bending mechanisms, and relates to a multi-stage passive bending mechanism based on variable cross-section cross reeds, and a mechanical mechanism for realizing multi-stage bending deformation under the action of external force. Background technique [0002] The passive bending mechanism is a mechanism that produces bending deformation under the action of an external force. It is a very common mechanical structure, such as the springboard of divers and the bow body of bows and arrows. The traditional passive bending deformation mechanism is generally similar to a simple cantilever beam, or a mechanism connected by a rotary mechanism with friction, which has great limitations in deformation. For a bending mechanism similar to a cantilever beam, its deformation accuracy is low because it is a single-stage deformation structure. For a mechanism connected by a rotary mechanism with friction, fricti...

AI Technical Summary

Problems solved by technology

The passive bending mechanism used in the article "Experimental Research on SMA Wire-Driven Bionic Tail Fin Propeller" in Volume 41, No. 7, 2013 of Micro-Special Motors is SMA wire. Since it bears active deformation at the same time, its passive deformation is affected by The restriction of active deformation cannot achieve the maximum passive deformation effect of bionic fish

Images