Passive bending axial rotation mechanism based on arc surface free end and three reed cross reeds

Abstract

The invention relates to a passive bending axial rotation mechanism based on cambered surface free ends and three-reed crossed reeds. The whole multi-stage passive bending and axial rotation mechanismconsists of a plurality of crossed reed units with different sizes and varieties; and the structure of single crossed reed consists of two cambered surface free ends and the crossed reeds connected with the cambered surface free ends. Three reeds, the angle between two of which is 120 degrees, are crossed to form each crossed reed in charge of axial rotation deformation; the two ends of the reedare connected with the free ends; and when forming the passive bending and axial rotation mechanism, the reed units are connected by the corresponding free ends to form the multi-stage crossed reed structure. The passive bending axial rotation mechanism has the advantages of high precision, no friction, no hysteresis, no abrasion, no stiction, free of lubrication and the like, and can replace manysimilar passive deformation structures in the practical engineering application aspect.

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 axial rotation mechanism based on the free end of the arc surface and the cross reeds of three reeds, in particular to a multi-stage passive bending under the action of external force Mechanism for deformation and axial rotation. 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 structu...

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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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