具有楔形间隙的圆筒式磁流变液离合器传动性能研究  

Research on drive performance of cylindrical MR clutch with wedge gaps

作　　者：赵金涛 胡荣丽 黄金 ZHAO Jin-tao;HU Rong-li;HUANG Jin(College of Mechanical Engineering,Chongqing University of Technology,Chongqing 400054,China)

机构地区：[1]重庆理工大学机械工程学院,重庆400054

出　　处：《磁性材料及器件》2023年第2期62-68,共7页Journal of Magnetic Materials and Devices

基　　金：国家自然科学基金资助项目(51875068)。

摘　　要：针对传统的圆筒式磁流变液传动装置存在轴向长度过长且传递转矩较小的问题,提出一种具有楔形间隙的圆筒式磁流变液离合器。运用有限元法对装置进行磁场仿真,在相同输入电流下,分析不同截面下不同间隙厚度的磁场分布,得出磁流变液的剪切屈服应力。根据传动装置的结构特点和Bingham模型理论,基于计算流体动力学对楔形间隙内流场的速度、压力、黏度及剪切应力分布进行分析,得到传递转矩随结构和转速的变化。研究结果表明,磁流变液间隙差越大,该楔形间隙提供的转矩越大;同时,磁流变液在挤压强化后,剪切屈服应力显著增加;在磁感应强度为0.55 T,初始屈服应力为30 kPa的条件下,同转速60 rad/s下相较于传统圆筒式磁流变液离合器,传递转矩提升了约1.12倍。In this paper,a cylindrical magnetorheological fluid clutch with wedge gap is proposed to solve the problem of long axial length and small transfer torque in traditional cylindrical magnetorheological fluid drive.Finite element method is used to simulate the magnetic field of the device.Under the same input current,the magnetic field distribution of the magnetorheological fluid thickness under different sections is analyzed and the shear yield stress of magnetorheological fluid is obtained.According to the structural characteristics of the transmission and Bingham model theory,the velocity,pressure,viscosity and shear stress distribution of the flow field in wedge gap are analyzed based on computational fluid dynamics,and the variation rule of transfer torque with structure and speed is obtained.The results show that the greater the gap difference between magnetorheological fluids,the greater the torque provided by the wedge gap.At the same time,the shear yield stress of MRF increases significantly after extrusion strengthening.At a magnetic induction strength of 0.55 T and an initial yield stress of 30 kPa.At the same speed of 60 rad/s,compared with the traditional cylindrical magnetorheological fluid clutch,the transmission torque is increased by about 1.12 times.

关 键 词：磁流变液离合器 楔形间隙 流场 输出转矩 

分 类 号：TB381[一般工业技术—材料科学与工程] TH133.4[机械工程—机械制造及自动化]