锥环式无级变速传动机构的传动机理及数字化平台开发
发布时间：2018-10-30 17:27
【摘要】：CVT（无级变速器）能够提供连续变速比，具有良好的燃油经济性、动力性和驾驶平顺性，因而受到汽车行业的青睐。目前广泛使用的是金属带式CVT，它主要是利用金属带在可变槽宽的带轮上进行动力传递，从而实现无级变速。金属传动带由两百多个金属片和两组金属环组成，结构较为复杂，运行过程中金属传动带带磨损严重，维护相对困难。基于此，本文在吉林大学校内基金—科学前沿与交叉学科创新项目“新型无级变速系统传动机理及动态特性的基础理论研究”的支持下，提出了一种结构简单、传动机理明了、维护方便的新型锥环式CVT传动系统。 论文在系统的分析了CVT的发展史和国内外研究现状的基础上，阐述了锥环式CVT的传动机理：通过滚锥自身几何特性实现速比的连续变化。分析了锥环式CVT速比调节方式及档位控制方式，提出了保证动力传递效率的有效措施，列出了关键部件之间的几何尺寸与锥环位置的谐应关系，为后续研究提供了基本理论依据。 论文基于多体动力学软件RecurDyn的二次开发平台PNet，开发了锥环式CVT数字化设计及分析模型系统，详细阐述了系统的开发目的、开发难点与重点及解决方式。本系统的开发实现了锥环式CVT关键部件尺寸与物理特性的参数化。简化了建模过程，减少了重复建模时间，提高了工作效率，为后续开发提供了基本结构框架。 论文依据锥环式CVT的传动机理，建立了锥环式CVT的三维模型。利用多体动力学软件RecurDyn，对其进行运动学仿真分析，获得了其传动比变化曲线，研究了锥环式CVT的传动规律：其传动比呈线性化变化。利用ANSYS软件在不同传动比位置对CVT传动系统做了应力分析，通过比较各个位置滚锥与锥环的受力状况，及同一部件不同位置所受应力大小，，得出整个传动过程中传动机构的受力特点。 论文系统阐述了锥环式CVT传动机理，并对主要传动部件进行了静力学分析，可为后续研究提供基本理论依据，具有重要的工程意义。阐述了锥环式CVT数字化设计及分析模型系统的开发流程，为今后的类似开发提供了基本方法与思路，具有重要的借鉴意义。
[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.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH132.41
本文编号：2300671
[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.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH132.41
【参考文献】
相关期刊论文 前3条
1 李春青,彭建中,吴彤峰;国内外汽车无级变速(CVT)技术的发展概况[J];广西工学院学报;2004年04期
2 冯樱,罗永革,何晓春,郝琪;CVT──无级变速器的发展综述[J];湖北汽车工业学院学报;1999年04期
3 李忠,秦大同;汽车牵引式无级变速器的传动特性研究[J];机械设计与研究;2004年06期
本文编号：2300671
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