摆线波纹状磁流变联轴器机理模型及特征

Theoretical model and characteristic of magnetorheological fluid coupling with cycloid curve

针对传统磁流变液联轴器存在的传递扭矩大与尺寸小、质量轻之间的矛盾,提出一种结构紧凑扭矩传递能力强的摆线波纹状磁流变联轴器,该结构使得波纹状磁流变液工作腔将磁链从单纯的剪切工作模式变为挤压与剪切混合工作模式,从而提高联轴器的动力传递能力.通过电磁学仿真验证磁感线在弧形表面的形成方式,基于金属塑性变形理论建立了混合工作模式下磁流变液传递扭矩的机理模型,分析联轴器的关键参数并考察了其性能特征.结果表明:该联轴器在相同尺寸的情况下稳定传递扭矩约为普通磁流变联轴器的1.6~2.0倍,为传统磁流变联轴器的优化设计与理论模型提供了理论依据.

Regarding to the contradiction between the large torque transmission and small size and light mass, a compact cycloid curved magnetorheological coupling with high efficiency of torque trans- mission ability was proposed, and the corrugated MRF （magnetorheologieal fluid） chamber made the working mode of magnetic fibrils changed from pure shear to extrusion and shear mixed, so as to im- prove the coupling power transmission ability. The magnetic induction line in forming arc surface was proved by electromagnetism simulation. The mixed mode of MRF torque transmission mechanism model was established based on the metal plastic deformation theory, the key parameters of coupling were analyzed and its properties were investigated. The results show that the coupling in the same size under the condition of stable transmission torque is about 1.6~2. 0 times of ordinary magnetorheolog- ical couplings, which provides theoretical basis for the design and optimization of the traditional theo- retical model of magnetorheological couplings.