Torsion quasi-zero stiffness vibration isolator

Abstract

The invention discloses a torsion quasi-zero stiffness vibration isolator. The torsion quasi-zero stiffness vibration isolator is mainly composed of a negative-stiffness cam-roller-radial spring mechanism and a positive-stiffness rubber spring vulcanized on a first coupling and a second coupling, and is further provided with a radial spring supporting component used for supporting a radial spring and guaranteeing that the radial spring only deforms in the radial direction. When the first coupling and the second coupling rotate relative to each other, the cam-roller-radial spring mechanism generates negative torsion stiffness, the rubber spring has positive torsion stiffness; under the parallel combination of the positive-stiffness element and the negative-stiffness element, the vibration isolator has the high static stiffness and low dynamic stiffness characteristic that the vibration isolator can bear large static loads, namely, the vibration isolator can transmit large static torque. The stiffness is zero at the static balance position, and the micro stiffness characteristic is shown near the static balance position. Thus, the vibration isolator can isolate ultralow-frequency torsion vibration of a shaft system.

Description

technical field [0001] The invention relates to a vibration isolator, in particular to a rubber-metal torsional quasi-zero-stiffness vibration isolator, which is suitable for isolating the torsional vibration of a shaft system and has low-frequency or ultra-low-frequency vibration isolation performance. Background technique [0002] Torsional vibration widely exists in industrial technology fields such as automobiles and ships. The ship propeller causes the torsional vibration of the transmission shaft under the action of periodic pulsation force, and the crankshaft of the automobile engine produces torsional vibration under the action of periodic force. On the one hand, the transmission of torsional vibration to the car body or hull structure will affect the ride comfort of automobiles and ships. In addition, the torsion will cause early wear of the crankshaft, and the amplitude of the torsional resonance exceeds the strength (stiffness) limit, causing severe shaft fracture...

AI Technical Summary

Problems solved by technology

However, the additional system will change the natural frequency of the entire system, which is effective for vibration reduction at a certain frequency, but may deteriorate the vibration reduction effect at other frequencies, and this type of technology does not fundamentally suppress the transmission of torsional vibration to the foundation

[0003] After retrieval, Chinese invention patents "torsional vibration attenuation device (application number: 201180075606.6)", "torsional vibration damper (application number: 201310057232.6)", "torsional vibration damper (application number: 201310418440.4)", "torsional vibration Shock absorber (application number: 201280022395.4)", "torsional vibration damper (application number: 201280019916.0)", etc. have proposed several torsional vibration dampers or dampers in combination with clutches for the torsional vibration of the shafting of the automobile transmission system. Although this type of technology is relatively mature in the automotive transmission system, it is not universal for other types of shafting vibrations; in addition, the engine will inevitably pass through the shafting resonance region during the acceleration phase of engine startup, which will inevitably cause large vibrations, and it is suitable for ultra-low frequency Vibration, the dampers above are not up to the task

[0004] After retrieval, Chinese invention patents "Sliding beam and spring combined nonlinear ultra-low frequency vibration isolator (application number: 201210145254.3)", "disc rubber quasi-zero stiffness vibration isolator (application number: 201310330360.3)", "buckling plate type standard Zero-stiffness vibration isolator (application number: 201310330357.1)", "rolling ball type quasi-zero-stiffness vibration isolator (application number: 201310330359.0)", "load-bearing adjustable zero-stiffness electromagnetic vibration isolator and its control method (application number: 201210081938.1)", utility model patents "nonlinear magnetic vibration isolator with quasi-zero stiffness (application number: 201120223834.0)", "a quasi-zero stiffness vibration isolator (application number: 201420008107.6)", " Single-degree-of-freedom vertical vibration isolation system (application number: 201320230643.6)” proposed several quasi-zero-stiffness vibration isolators for vertical translational vibration, but no quasi-zero-stiffness vibration isolator for torsional vibration was retrieved

Images