Passive bending and axial rotating mechanism based on cross reeds with variable cross sections

Abstract

The invention relates to a passive bending and axial rotating mechanism based on cross reeds with variable cross sections. The whole multistage passive bending and axial rotating mechanism consists ofa plurality of cross reed units of different sizes and types, cambered free ends are adopted for units bearing passive bending, and the cross points of the cross reeds are overlapped with the cross reed units relative to the circle center of the free end on the outer side of the whole bending mechanism, so that the offset of the cross point of each cross reed unit is reduced when each cross reedunit is subjected to passive bending deformation, and the deformation precision of each cross reed unit is higher. The cross reeds adopt the cross reed units with the variable cross sections, and thecross section of each reed is thinnest at the corresponding cross point and thickest at the portion connected with the free end, so that the large passive deformation is realized under the condition of ensuring the deformation precision. The mechanism has the advantages of high precision, no friction, no lag, no wear, no stiction, no lubrication and the like.

Description

technical field [0001] The invention belongs to the field of multi-stage passive bending and axial rotation mechanisms, and relates to a passive bending and axial rotation mechanism based on variable cross-section cross reeds, in particular to a multi-stage passive bending deformation and axial rotation mechanism under the action of external force. Rotating mechanism. 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 m...

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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

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