A Passive Bending Axial Rotation Mechanism Based on Variable Cross-section Cross Springs

Abstract

The invention relates to a passive bending axial rotation mechanism based on variable cross-section cross reeds. The entire multi-stage passive bending and axial rotation mechanism is composed of a plurality of cross reed units of different sizes and types. For the units that undertake passive bending , the free end of the arc surface is used, and the cross point of the cross reed overlaps with the center of the circle of the cross reed unit relative to the outer free end of the entire bending mechanism, which makes the offset of the cross point of each cross reed unit during passive bending deformation has decreased, making its deformation more accurate. The cross reed adopts a cross reed unit with variable cross section. The cross section of each reed is the thinnest at the intersection point and the thickest at the part connected to the free end, which enables greater passive deformation while ensuring deformation accuracy. The invention has the advantages of high precision, no friction, no hysteresis, no wear, no static resistance, no lubrication and so on.

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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