链式CVT变速传动控制机构设计及动力学分析

发布时间：2018-06-08 15:08

本文选题：无级变速 + 传动控制　；参考：《吉林大学》2016年硕士论文

【摘要】：无级变速器(CVT)是一种技术先进的变速器产品,与传统变速器相比其结构简单、成本低、能够充分发挥发动机的动力特性,实现动力传动系统的综合控制。从变速的平稳性以及良好的燃油经济性这两项优势来看,无级变速器(CVT)的市场前景十分广阔。目前,无级变速器大多采用液压控制系统对锥盘加压实现变速传动控制,本文依托企业委托技术开发实际项目,提出一种机械式传功控制机构。该机构通过螺旋机构对锥盘进行加压,利用伺服电机进行调速,与传统液压控制机构相比,能显著降低汽车油耗,提高变速系统的传动效率。本文通过对比分析不同传动形式的变速器,结合机械式CVT传动控制机构的国内外研究现状,详细阐述了链式CVT变速传动系统的主要组成部件与变速原理,针对链式CVT的变速系统力学模型,对变速系统的链条张力以及锥盘夹紧力受力模型进行了研究和分析。从无级变速传动系统的设计要求和机电一体化控制的原理出发,提出了行星轮系与微调螺旋机构联合控制的传动控制方案。根据变速传动控制机构的设计要求对机械式变速传动控制机构进行了系统性的设计,同时针对行星轮系中的齿轮进行了参数化设计。利用ADAMS动力学分析软件,建立了变速传动控制机构在三种典型传动比工况下的动力学仿真模型,研究了不同传动比工况下变速系统的动力学特性,计算了变速系统的传动比误差,分析了系统的传递效率。根据变速系统链节之间的张力、销轴与锥盘之间的接触力,分析了变速系统的受力情况。根据标记链节在特定平面内的运行轨迹,分析了变速传动过程中链条系统的波动情况。利用ANASYS对传动控制机构中行星轮系进行了静力学特性分析计算,对行星轮系中的太阳轮与行星齿轮之间的啮合特性进行了研究,根据中心轮与行星轮在静载荷作用下的应力和应变云图分析了应力应变情况,计算结果表明所设计行星轮系机构满足其强度与刚度设计要求。本文研究成果为CVT传动控制系统的设计与分析奠定了重要的理论基础,对加快我国无级变速器研发技术的自主化与产业化进程以及提升我国汽车产品的自主创新能力具有重要的工程指导意义。
[Abstract]:CVT is a kind of technologically advanced transmission product. Compared with traditional transmission, CVT has a simple structure and low cost. It can give full play to the power characteristics of the engine and realize the comprehensive control of the power transmission system. From the point of view of the smoothness of speed change and good fuel economy, the market prospect of CVT (CVT) is very broad. At present, the stepless transmission mostly uses hydraulic control system to realize the variable speed drive control on the conical disc. This paper puts forward a kind of mechanical power transmission control mechanism based on the enterprise entrusting technology to develop the actual project. Compared with the traditional hydraulic control mechanism, this mechanism can significantly reduce the fuel consumption of the automobile and improve the transmission efficiency of the variable speed system. In this paper, the main components and principle of chain CVT transmission system are described in detail by comparing and analyzing the transmission with different transmission forms and combining with the domestic and international research status of mechanical CVT transmission control mechanism. Based on the mechanical model of variable speed system of chain CVT, the model of chain tension and clamping force of tapered disk is studied and analyzed. Based on the design requirements of stepless variable speed transmission system and the principle of electromechanical integrated control, the drive control scheme of planetary gear train and fine adjusting screw mechanism is put forward. According to the design requirements of the variable speed transmission control mechanism, the mechanical transmission control mechanism is systematically designed, and the parameterized design of the gear in the planetary gear train is carried out at the same time. Using Adams dynamic analysis software, the dynamic simulation model of the variable speed transmission control mechanism under three typical transmission ratio conditions is established, and the dynamic characteristics of the variable speed system under different transmission ratio conditions are studied. The transmission ratio error of the variable speed system is calculated and the transmission efficiency of the system is analyzed. According to the tension between the chain joints and the contact force between the pin shaft and the cone disc, the force of the variable speed system is analyzed. The fluctuation of chain system in the process of variable speed transmission is analyzed according to the running track of the marked link in a particular plane. The static characteristics of planetary gear train in transmission control mechanism are analyzed and calculated by ANASYS, and the meshing characteristics between solar gear and planetary gear in planetary gear train are studied. According to the stress and strain cloud diagram of the center gear and the planetary wheel under static load, the stress and strain conditions are analyzed. The calculated results show that the designed planetary gear train meets the design requirements of strength and stiffness. The research results in this paper have laid an important theoretical foundation for the design and analysis of CVT transmission control system. It is of great significance to accelerate the independent development and industrialization of stepless transmission technology in China and to enhance the independent innovation ability of automobile products in China.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：U463.2

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