發(fā)布時(shí)間：2018-04-08 21:20

  本文選題：離合器　切入點(diǎn)：波形彈簧　出處：《重慶理工大學(xué)》2016年碩士論文

【摘要】：對(duì)于A(yíng)MT變速器的發(fā)展歷程而言,自動(dòng)離合器的研發(fā)具有重大而深遠(yuǎn)的意義,但自動(dòng)離合器與相關(guān)部件協(xié)調(diào)控制具有較高的難度。因?yàn)锳MT離合器在接合與分離過(guò)程中,對(duì)其傳遞轉(zhuǎn)矩的控制品質(zhì)會(huì)影響到AMT變速器的工作性能,進(jìn)而間接影響到裝配了AMT自動(dòng)變速器車(chē)輛的乘坐舒適性。為了精確控制離合器傳遞轉(zhuǎn)矩就必須建立以分離軸承為輸入,傳遞轉(zhuǎn)矩為輸出的傳遞轉(zhuǎn)矩模型,從傳遞轉(zhuǎn)矩生成機(jī)理入手,深入分析離合器總成中各部件工作特性對(duì)其傳遞轉(zhuǎn)矩的影響。而以往研究離合器在接合與分離過(guò)程中的轉(zhuǎn)矩都是通過(guò)數(shù)學(xué)模型,近似認(rèn)為轉(zhuǎn)矩為線(xiàn)性變化,忽略了從動(dòng)盤(pán)和主動(dòng)盤(pán)的非線(xiàn)性特性。隨著計(jì)算機(jī)數(shù)據(jù)處理能力越來(lái)越強(qiáng)大,通過(guò)數(shù)值分析的手段來(lái)研究裝配體的力學(xué)問(wèn)題越來(lái)越成熟,本文利用多物理場(chǎng)耦合分析方法并以試驗(yàn)驗(yàn)證為支撐,來(lái)研究AMT離合器膜片彈簧、波形彈簧和膜片彈簧與波形彈簧耦合模型的載荷-變形特性,并建立AMT離合器接合過(guò)程接合壓力模型;通過(guò)分析AMT離合器接合過(guò)程溫度場(chǎng)與接合壓力、接觸面積、接觸剛度之間的協(xié)同效應(yīng)并合理設(shè)置各模型上相關(guān)物理量及幾何參數(shù)的耦合關(guān)系并形成耦合計(jì)算規(guī)則,結(jié)合AMT離合器接合過(guò)程力和轉(zhuǎn)矩平衡條件,導(dǎo)出AMT離合器接合過(guò)程動(dòng)態(tài)傳遞轉(zhuǎn)矩模型,并以該模型為基礎(chǔ)研究離合器動(dòng)態(tài)傳遞轉(zhuǎn)矩特性。首先對(duì)AMT自動(dòng)變速器和離合器結(jié)構(gòu)作了簡(jiǎn)介,分析了摩擦轉(zhuǎn)矩原理,提出動(dòng)態(tài)傳遞轉(zhuǎn)矩變化特性主要受接合壓力變化特性影響,并提出膜片彈簧和波形彈簧的載荷-形變特性對(duì)于主、從動(dòng)盤(pán)工作特性起決定性作用。建立了波形彈簧三維模型和接觸動(dòng)力學(xué)仿真模型,分析了離合器的動(dòng)態(tài)接合過(guò)程,提出動(dòng)態(tài)傳遞轉(zhuǎn)矩的四個(gè)階段及消除間隙階段、波形彈簧階段、膜片彈簧階段和鎖止階段;揭示了波形彈簧與膜片彈簧的載荷-形變特性與傳遞轉(zhuǎn)矩之間的聯(lián)系。然后分析離合器熱傳遞方式,根據(jù)離合器生熱散熱情況確定膜片彈簧與波形彈簧熱分析邊界條件,得到波形彈簧與膜片彈簧耦合模型溫度場(chǎng),研究溫度場(chǎng)對(duì)于傳遞轉(zhuǎn)矩的影響,并通過(guò)離合器綜合性能試驗(yàn)對(duì)研究課題做了試驗(yàn)驗(yàn)證。
[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.
【學(xué)位授予單位】：重慶理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類(lèi)號(hào)】：U463.211

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