干式离合器动态传递转矩仿真分析与试验研究

发布时间：2018-04-08 21:20

本文选题：离合器　切入点：波形弹簧　出处：《重庆理工大学》2016年硕士论文

【摘要】：对于AMT变速器的发展历程而言,自动离合器的研发具有重大而深远的意义,但自动离合器与相关部件协调控制具有较高的难度。因为AMT离合器在接合与分离过程中,对其传递转矩的控制品质会影响到AMT变速器的工作性能,进而间接影响到装配了AMT自动变速器车辆的乘坐舒适性。为了精确控制离合器传递转矩就必须建立以分离轴承为输入,传递转矩为输出的传递转矩模型,从传递转矩生成机理入手,深入分析离合器总成中各部件工作特性对其传递转矩的影响。而以往研究离合器在接合与分离过程中的转矩都是通过数学模型,近似认为转矩为线性变化,忽略了从动盘和主动盘的非线性特性。随着计算机数据处理能力越来越强大,通过数值分析的手段来研究装配体的力学问题越来越成熟,本文利用多物理场耦合分析方法并以试验验证为支撑,来研究AMT离合器膜片弹簧、波形弹簧和膜片弹簧与波形弹簧耦合模型的载荷-变形特性,并建立AMT离合器接合过程接合压力模型;通过分析AMT离合器接合过程温度场与接合压力、接触面积、接触刚度之间的协同效应并合理设置各模型上相关物理量及几何参数的耦合关系并形成耦合计算规则,结合AMT离合器接合过程力和转矩平衡条件,导出AMT离合器接合过程动态传递转矩模型,并以该模型为基础研究离合器动态传递转矩特性。首先对AMT自动变速器和离合器结构作了简介,分析了摩擦转矩原理,提出动态传递转矩变化特性主要受接合压力变化特性影响,并提出膜片弹簧和波形弹簧的载荷-形变特性对于主、从动盘工作特性起决定性作用。建立了波形弹簧三维模型和接触动力学仿真模型,分析了离合器的动态接合过程,提出动态传递转矩的四个阶段及消除间隙阶段、波形弹簧阶段、膜片弹簧阶段和锁止阶段;揭示了波形弹簧与膜片弹簧的载荷-形变特性与传递转矩之间的联系。然后分析离合器热传递方式,根据离合器生热散热情况确定膜片弹簧与波形弹簧热分析边界条件,得到波形弹簧与膜片弹簧耦合模型温度场,研究温度场对于传递转矩的影响,并通过离合器综合性能试验对研究课题做了试验验证。
[Abstract]:For the development of AMT transmission, the research and development of automatic clutch is of great and far-reaching significance, but it is difficult to coordinate the control of automatic clutch and related parts.In the process of joint and separation of AMT clutch, the control quality of its transfer torque will affect the working performance of AMT transmission, and then indirectly affect the ride comfort of AMT automatic transmission vehicle.In order to accurately control the transfer torque of the clutch, it is necessary to establish a transfer torque model which takes the separation bearing as the input and the transfer torque as the output, starting with the mechanism of the transfer torque generation.The effect of the working characteristics of each component on the transmission torque of clutch assembly is analyzed in depth.In the past, the torque of clutch in the process of joint and separation was studied by mathematical model. It is considered that the torque is linearly changed, and the nonlinear characteristics of the follower and active disk are neglected.As the ability of computer data processing becomes more and more powerful, it is more and more mature to study the mechanical problems of assembly by means of numerical analysis. In this paper, the multi-physical field coupling analysis method is used and supported by experimental verification.The load-deformation characteristics of AMT clutch diaphragm spring, waveform spring and diaphragm spring coupled with waveform spring are studied, and the engagement pressure model of AMT clutch is established.By analyzing the synergetic effect between the temperature field and the engagement pressure, contact area and contact stiffness during the engagement of AMT clutch, the coupling relation of the relevant physical quantities and geometric parameters on each model is reasonably set up and the coupling calculation rules are formed.Combined with the force and torque balance conditions of AMT clutch engagement process, the dynamic transfer torque model of AMT clutch engagement process is derived. Based on this model, the dynamic transfer torque characteristics of the clutch are studied.Firstly, the structure of AMT automatic transmission and clutch is introduced, the friction torque principle is analyzed, and the dynamic transfer torque change characteristic is mainly affected by the joint pressure change characteristic.The load-deformation characteristics of diaphragm spring and waveform spring play a decisive role in the working characteristics of the main and follower disc.The 3D model and contact dynamics simulation model of wave spring are established, and the dynamic engagement process of clutch is analyzed. The four stages of dynamic torque transfer and clearance elimination, wave spring, diaphragm spring and locking are put forward.The relationship between load-deformation characteristics and transfer torque of wave spring and diaphragm spring is revealed.Then the heat transfer mode of clutch is analyzed and the thermal analysis boundary conditions of diaphragm spring and wave spring are determined according to the heat dissipation of clutch. The coupling model temperature field of wave spring and diaphragm spring is obtained, and the effect of temperature field on transfer torque is studied.And through the clutch comprehensive performance test, the research subject has been tested and verified.
【学位授予单位】：重庆理工大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：U463.211

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