Quasi-zero stiffness coupling

Abstract

A quasi-zero stiffness coupling comprises a shell and an inner shaft arranged in the shell. One end of the inner shaft is connected with the bottom of the shell through a rubber spring, and the rubber spring is a tooth-type rubber spring. The inner ring of the rubber spring and teeth at the end of the inner shaft are clamped to each other closely, and the outer ring of the rubber spring and teeth on the inner wall of the shell are clamped to each other closely, so that it is guaranteed that the shell drives the inner shaft to rotate together when twisting. An outer magnetic ring is fixed to the inner wall of the shell, an inner magnetic ring is fixed to the outer circumferential ring of the inner shaft, and the outer magnetic ring and the inner magnetic ring constitute a magnetic spring. The outer ring of the bearing is matched with the shell, the inner ring of the bearing and the inner shaft are matched to restrain the inner shaft from making axial movement and radial movement relative to the shell. The negative stiffness of the outer magnetic ring and the inner magnetic ring are made approximate to the positive stiffness of the rubber spring by selecting geometrical parameters of the outer magnetic ring and the inner magnetic ring, so that the total stiffness is made to reach a quasi-zero state. The quasi-zero stiffness coupling can effectively transmit driving torque, also can isolate disturbance torque, has a wide vibration isolation frequency band, and has a good isolation effect on low-frequency disturbance. The quasi-zero stiffness coupling can be used for solving the torsional vibration problem of a rotor system, and is particularly suitable for precise rotor systems.

Description

technical field [0001] The invention relates to a shaft coupling, in particular to a quasi-zero-stiffness coupling capable of effectively transmitting driving torque and having a low-frequency vibration isolation effect, which can well suppress torsional vibration of a shaft system. Background technique [0002] The phenomenon of torsional vibration commonly exists in automobiles, ships, aerospace and other fields, and basically all rotor systems have torsional vibration problems. Torsional vibration will cause gear wear and shaft fracture, which will affect the normal operation of mechanical equipment; severe torsional vibration will also cause noise problems, especially for engines on aircraft and ships. The strong noise caused by torsional vibration will seriously affect stealth Effect; for precision engineering fields, such as spacecraft systems, torsional vibration will affect the accuracy of precision instruments. [0003] The coupling is an essential part of the roto...

AI Technical Summary

Problems solved by technology

After searching, only the patent "torsional quasi-zero stiffness vibration isolator (application number: 201410558315.8)" proposed a quasi-zero stiffness vibration isolator in the torsional direction, but the disadvantage of this method is that the structure is complex, the size is large, and it is difficult to miniaturize , precision

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