【作者】 邓润林；

【导师】 金国栋；

【作者基本信息】 华中科技大学 ， 车辆工程， 2005， 硕士

【摘要】 牵引式全环面无限变速器(IVT)是采用转矩分流方法,把全环面可变耦合器(Variator)与行星齿轮机构及定速比齿轮机构结合起来,其减速比可以达到正无穷(前进时)和负无穷(倒车时),即变速时输出轴可以由正转经零转(称齿轮空档状态)到反转,因而命名为无限变速器(Infinitely Variable Transmission,简称IVT)。它由于具有很好的燃油经济性和驾驶性能,且具有效率高、结构简单、成本低、传递转矩大等优点,已引起国内外众多研究者和厂家的广泛关注,有望成为新一代汽车变速器。为掌握这一新型变速器的工作原理和设计理论,为实现自主开发奠定基础,本文对牵引式全环面IVT 主要进行了以下几个方面的工作: 1. 在阅读国内外大量参考文献的基础上,考察了牵引式全环面IVT 的发展历史和研究现状,分析了它们的工作特点和应用状况。2. 比较了IVT 各种可能结构的功率流和效率,并在此基础上确定了一种改进方案,该方案所采用的功率分流布置有利于减小功率循环,提高传动效率。3. 对牵引式全环面IVT 的核心部件可变耦合器(Variator)进行了运动学和动力学分析,推导出了滚轮的精确的运动学关系,并作了相应的参数分析; 建立了Variator的动力学模型,用该模型作了动力性仿真分析; 总结了牵引传动的具体设计过程。上述研究也为牵引式全环面IVT 控制参数的确定提供了依据。4. 分析了全环面IVT 的控制原理和转矩控制过程,对全环面IVT 的控制策略以及发动机与全环面IVT 的综合控制进行了初步探讨。论文最后指出了进一步研究所需做的工作。更多还原

【Abstract】 By torque split method and combination of a full-toroidal variator, an epicyclic gear train and a fix-ratio gear, the full-toroidal traction IVT is capable of changing the reduction gear ratio up to plus infinite (when forward drive) or minus infinite (when backward drive). In other words, the output axle of the IVT can undergo the running condition from one direction revolution to reverse revolution via geared neutral state. This is why the IVT (Infinitely Variable Transmission) is denominated. Due to excellent fuel economy and driveability, and other features such as simple configuration, low cost and high torque transfer capability, it has attracted much attention of researchers and manufacturers abroad and at home, and is expected to be a new generation of automotive transmission. For the purpose of grasping working principle and design theory of the new type transmission, and establishing basis for self development of the technology, the following work is conducted in this thesis: 1. The developing history, research status of the full-toroidal traction IVT are investigated, and its working features and application situation are also analysed based on the comprehensive literature review. 2. The different power flow and efficiency of possible IVT configuration are compared from each other. And an improved structure scheme is proposed which is beneficial to the recirculating power reduction and efficiency improvement by power split method. 3. As the core constituent, the variator is studied in detail by kinematic and dynamic analysis. The refined kinematic relationships of the roller are deduced and parametric study is then conducted. With the dynamic model establishment, the simulation analysis is followed, the specific design process of the traction drive is summarized. The above studies also provide theoretical base for determination of IVT control parameters. 4. The control principle and torque control process of the full-toroidal traction IVT is analysed. The control strategy of IVT and the integrated control of IVT with engine are studied preliminarily. In the end of this thesis, futher research work needed to do is indicated.更多还原