Zero-rigidity flexible bearing

Abstract

The invention discloses a zero-rigidity flexible bearing which comprises an end cover, a negative rigidity component and a generalized triple-crossed reed flexible bearing, wherein the negative rigidity component is arranged on the end part of the generalized triple-crossed reed flexible bearing; the generalized triple-crossed reed flexible bearing comprises two single reed annular bodies, a pad and cylindrical pins; the pad is arranged between the two single reed annular bodies; each cylindrical pin penetrates through pin holes in the single reed annular bodies and the pad; due to the matching between the cylindrical pins and the pin holes, the stacked single reed annular bodies are connected with the pad to form a whole so as to form the generalized triple-crossed reed flexible bearing. The zero-rigidity flexible bearing has the characteristics of high precision and low shaft drifting. The negative rigidity component is connected in series with the generalized triple-crossed reed flexible bearing to form the zero-rigidity flexible bearing, so that the rotary deformation rigidity of the flexible bearing can be greatly reduced, and a requirement on an output torque of a driving unit such as a motor is lowered.

Description

technical field [0001] The invention relates to a flexible bearing, more particularly, a zero-stiffness flexible bearing formed by connecting a negative stiffness assembly in series on a generalized three-cross reed flexible bearing. Background technique [0002] Flexible bearings are now more and more widely used, and its working principle is to use the flexible unit to deform under the action of external force to generate relative rotation. Due to the advantages of no friction, no gap, self-centering, no lubrication, no maintenance, and vacuum application, flexible bearings are favored in precision fields such as precision positioning and micro-motion platforms, and have been used in cryogenic spectrometers and light source synchronization. Accelerators, meteorological satellite optical device adjustments, adaptive field adjustment mechanisms on astronomical telescopes, alignment mechanisms for microwave antennas on spacecraft, etc. [0003] The design goal of flexible be...

AI Technical Summary

Problems solved by technology

However, since the flexible bearing relies on the elastic deformation of the reed to achieve movement, when the flexible bearing rotates, it will inevitably generate a restoring moment, thereby hindering the further deformation of the flexible bearing, which requires the drive unit (such as motor, etc.) to provide A large output torque to drive and maintain the motion of the flexible bearing

The rotational stiffness of the flexible bearing can be reduced by reducing the thickness of the reed or increasing the length of the reed, but this method can only reduce the rotational stiffness to a limited extent, which does not achieve the ideal zero stiffness characteristics, and at the same time reduces the non-functional stiffness

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