【摘要】：CVT（無級變速器）能夠提供連續(xù)變速比，具有良好的燃油經(jīng)濟(jì)性、動力性和駕駛平順性，因而受到汽車行業(yè)的青睞。目前廣泛使用的是金屬帶式CVT，它主要是利用金屬帶在可變槽寬的帶輪上進(jìn)行動力傳遞，從而實(shí)現(xiàn)無級變速。金屬傳動帶由兩百多個金屬片和兩組金屬環(huán)組成，結(jié)構(gòu)較為復(fù)雜，運(yùn)行過程中金屬傳動帶帶磨損嚴(yán)重，維護(hù)相對困難。基于此，本文在吉林大學(xué)校內(nèi)基金—科學(xué)前沿與交叉學(xué)科創(chuàng)新項(xiàng)目“新型無級變速系統(tǒng)傳動機(jī)理及動態(tài)特性的基礎(chǔ)理論研究”的支持下，提出了一種結(jié)構(gòu)簡單、傳動機(jī)理明了、維護(hù)方便的新型錐環(huán)式CVT傳動系統(tǒng)。 論文在系統(tǒng)的分析了CVT的發(fā)展史和國內(nèi)外研究現(xiàn)狀的基礎(chǔ)上，闡述了錐環(huán)式CVT的傳動機(jī)理：通過滾錐自身幾何特性實(shí)現(xiàn)速比的連續(xù)變化。分析了錐環(huán)式CVT速比調(diào)節(jié)方式及檔位控制方式，提出了保證動力傳遞效率的有效措施，列出了關(guān)鍵部件之間的幾何尺寸與錐環(huán)位置的諧應(yīng)關(guān)系，為后續(xù)研究提供了基本理論依據(jù)。 論文基于多體動力學(xué)軟件RecurDyn的二次開發(fā)平臺PNet，開發(fā)了錐環(huán)式CVT數(shù)字化設(shè)計及分析模型系統(tǒng)，詳細(xì)闡述了系統(tǒng)的開發(fā)目的、開發(fā)難點(diǎn)與重點(diǎn)及解決方式。本系統(tǒng)的開發(fā)實(shí)現(xiàn)了錐環(huán)式CVT關(guān)鍵部件尺寸與物理特性的參數(shù)化。簡化了建模過程，減少了重復(fù)建模時間，提高了工作效率，為后續(xù)開發(fā)提供了基本結(jié)構(gòu)框架。 論文依據(jù)錐環(huán)式CVT的傳動機(jī)理，建立了錐環(huán)式CVT的三維模型。利用多體動力學(xué)軟件RecurDyn，對其進(jìn)行運(yùn)動學(xué)仿真分析，獲得了其傳動比變化曲線，研究了錐環(huán)式CVT的傳動規(guī)律：其傳動比呈線性化變化。利用ANSYS軟件在不同傳動比位置對CVT傳動系統(tǒng)做了應(yīng)力分析，通過比較各個位置滾錐與錐環(huán)的受力狀況，及同一部件不同位置所受應(yīng)力大小，，得出整個傳動過程中傳動機(jī)構(gòu)的受力特點(diǎn)。 論文系統(tǒng)闡述了錐環(huán)式CVT傳動機(jī)理，并對主要傳動部件進(jìn)行了靜力學(xué)分析，可為后續(xù)研究提供基本理論依據(jù)，具有重要的工程意義。闡述了錐環(huán)式CVT數(shù)字化設(shè)計及分析模型系統(tǒng)的開發(fā)流程，為今后的類似開發(fā)提供了基本方法與思路，具有重要的借鑒意義。
[Abstract]:CVT (continuously variable transmission) can provide continuous speed ratio, with good fuel economy, power and driving comfort, so it is favored by automobile industry. At present, metal belt type CVT, is widely used. It mainly uses metal belt to transfer power on the belt wheel with variable slot width, so as to realize stepless speed change. The metal belt is composed of more than 200 metal sheets and two groups of metal rings. The structure of the belt is more complicated. During the operation the belt is worn seriously and it is relatively difficult to maintain. Based on this, this paper puts forward a simple structure and clear transmission mechanism, supported by the "basic theoretical Research on the driving Mechanism and dynamic characteristics of a New Type of continuously variable Speed system", which is supported by the Fund-Science Frontier and Interdisciplinary Innovation Project of Jilin University. Maintenance of a new type of conical ring CVT transmission system. Based on the systematic analysis of the history of CVT and the present research situation at home and abroad, the transmission mechanism of conical ring type CVT is expounded in this paper: the continuous change of speed ratio is realized by the geometric characteristics of taper. This paper analyzes the adjustment mode and gear control mode of conical ring CVT speed ratio, puts forward effective measures to ensure the efficiency of power transfer, and lists the harmonic relation between the geometric dimensions of key components and the position of conical ring. It provides the basic theoretical basis for the follow-up study. Based on the secondary development platform PNet, of multi-body dynamics software RecurDyn, a cone-ring CVT digital design and analysis model system is developed in this paper. The purpose, difficulties, emphases and solutions of the system are described in detail. The development of this system realizes the parameterization of the key components of conical ring CVT. The modeling process is simplified, the repeated modeling time is reduced, the work efficiency is improved, and the basic structure framework is provided for the subsequent development. According to the driving mechanism of conical ring type CVT, a three-dimensional model of conical ring type CVT is established in this paper. The kinematics simulation of the multi-body dynamics software RecurDyn, is used to obtain the changing curve of the transmission ratio. The driving law of the conical ring type CVT is studied: the transmission ratio is linearized. The stress of CVT transmission system is analyzed by using ANSYS software in different transmission ratio position. By comparing the stress condition of roller cone and conical ring in each position, and the stress magnitude of different position of the same component, the stress of CVT transmission system is analyzed. The mechanical characteristics of the transmission mechanism are obtained in the whole transmission process. In this paper, the mechanism of conical ring CVT transmission is systematically expounded, and the statics analysis of main transmission parts is carried out, which can provide the basic theoretical basis for further research and has important engineering significance. This paper expounds the development process of the cone-ring CVT digital design and analysis model system, which provides the basic method and train of thought for the similar development in the future, and has important reference significance.
【學(xué)位授予單位】：吉林大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2012
【分類號】：TH132.41

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本文編號：2300671