冗余保护式磁流变离合器设计

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摘 要
 离合器发展至今，大多采用纯摩擦片（盘）和压盘直接接触或分离的方式来实现离合器的作用。受传统离合器原理和结构和受到大动载荷的冲击的影响，传统离合器常常会出现磨损严重，寿命短同时又具有相当大的噪音。
 采用磁流变液作为介质连接压盘和摩擦片设计磁流变液离合器，则可以减弱或消除这些缺点。它利用磁流变液在外加磁场中的剪切力来传递扭矩，达到离合器的作用。由于磁流变液的本身特性也使得离合器具有了响应时间短，回转阻力可控、结构紧凑、操作简单、使用寿命长等特点。
 同时考虑到目前一些电控件的不稳定性以及使用上地稳定性，所以在设计离合器时采用了冗余保护式磁流变离合器，即采用磁流变和机械双重控制。通常情况下采用磁流变离合器进行离合，当磁流变出现控制不稳或者出现问题时则冗余保护不起起作用，即采用机械式离合器，保证离合器的使用安全性。
 设计中首先了解作为离合器中重要部分——磁流变液的特点，同时掌握传统离合器的结构和工作原理。参考传统离合器对新型离合器进行结构设计和磁路设计。使结构和操作尽可能的简单。决定大概的结构以后对离合器的各个部件进行尺寸计算，干涉问题，校核问题的解决等。使离合器真正做到磁流变和机械控制冗余保护地一体化，保证离合器地安全稳定性。
 关键词：磁流变离合器 冗余保护 设计 智能材料 

Abstract
 Clutch development so far , the most of the clutch use the way of the purpose of the friction plate and the pressure plate directly contact or separated to realize  the function of the clutch.  because of the principle and the construction of the function and the impaction of large dynamic load,  the traditional clutch will appear the phenomenon of heavy wear, short life and the big noise.
 A new fluid clutch that uses a magnetic fluid as a medium to connect the smart material pressure plate and friction plat is able to overcome or reduce these shortcomings. It use magnetic fluids in magnetic field in the shear force to transfer torque to achieve the role of clutch. the characteristics of magnetic fluid makes the clutch itself has a short response time, turning the resistance control, compact structure, easy operation and long service life.
 And taking into account the current instability of some electrical controls and the use of land stability, we use the machinery and magnetorheological way to control the clutch. usually we use the magnetorheological clutch. when control of magnetorheological become unstable or has a problem, we can use the machinery          way to control the clutch. so we can ensure the stability.
 In the design we must know the characteristic of the MRF that is the important part of the clutch.  we also know the structure and working principle of the clutch. reference to the traditonal clutch, we can design the structure and the magnetic circuit of the new clutch.  that will make the structure and operation simple as possible. After we design the structure of the clutch, we will calculate the size and solve the problem of the interference and the check. so we can come to truly magnetorheological clutch and mechanical control to integration, and ensure the security and stability.
 
 
 Keywords: Magnetorheological clutch；Traditional clutch ；Design ；
 Intellectual material

目 录
摘 要 ii
Abstract iii
目 录 I
第一章 绪论 1
1.1 设计背景 1
1.2 设计方法 1
1.2.1 磁流变控制部分 2
1.2.2 冗余保护部分 2
1.2.3 磁流变—冗余保护转换部分 3
 1.3设计步骤 3
第二章 磁流变液的机理 4
第三章  冗余保护式磁流变离合器设计方案 6
3.1 磁流变离合器结构原理分析 6
3.2 磁流变离合器特点分析 8
3.3 冗余保护式磁流变离合器方案分析 8
第四章  冗余保护式磁流变离合器设计 11
4.1冗余保护式磁流变液离合器扭矩分析 11
4.2冗余保护式磁流变离合器的磁路设计 13
4.3各零部件的设计 15
第五章 总结 25
参考文献 26
致谢 27

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