【作者】 李军；

【导师】 孙冬野；

【作者基本信息】 重庆大学 ， 车辆工程， 2009， 硕士

【摘要】 V型橡胶带无级变速传动系统具有转速平稳、速比变化范围宽、易于操作、结构简单紧凑、重量轻、造价低廉和易于维护等优点,在摩托车等车辆上被广泛应用,因而开展摩托车用V型橡胶带无级变速传动系统设计方法的研究工作具有很实际的意义。本文具体内容如下:①对带传动中带的受力进行了分析,得出传动带的受力平衡方程式和松、紧边的张力表达式;求取了整个摩托车V型橡胶带无级变速传动系统的传动效率。②通过对从动带轮的结构、工作原理和工作过程分析,提出了转矩感应加载机构的设计准则;在力平衡关系的基础上,导出从动带轮转矩感应加载机构参数的设计方程;通过对从动带轮轴向受力的仿真分析,得出了各个参数对从动带轮轴向受力的影响规律,同时针对应用中遇到的问题,提出了从动带轮转矩感应加载机构结构设计的改进方案。③对主动带轮的结构、工作原理和工作过程进行分析,提出了主动带轮调速机构的设计准则;同样在力平衡基础上推导出主动带轮调速机构参数的设计方程;对主动带轮调速机构实际应用中存在的问题进行了仿真分析,找出了问题存在的原因,引入了双象限离心蹄块设计方法。④根据整车、发动机以及变速传动系统的参数,给出了传动系统的匹配策略和匹配方法,制定了目标速比的变化规律;给出了简化而实用的传动系统的力学模型,以及在不同的输入转矩和速比工况下传动系统的各种力的平衡关系和带轮轴向力的确定方法。⑤建立了V型橡胶带无级变速传动系统程式仿真模型,对整车进行了动力性和循环工况模拟仿真;在获得主、从动带轮不同参数对系统轴向力的影响规律的基础上,对某款雪橇车上应用的V型橡胶带无级变速传动系统在发动机节气门全开、发动机发出最大功率的工况下的轴向受力情况进行了仿真分析。针对变速初始阶段主动带轮调速机构不能提供足够的力来克服从动带轮对传动带的换挡力情况,分别应用双象限离心蹄块技术和变工作直径转矩凸轮进行仿真对比分析;最后,对整个设计流程做出总结,明确了整个系统设计的流程。更多还原

【Abstract】 For rubber V-Belt Continuously Variable Transmission with a smooth transmission, a wide speed ratio change range, easily to operate, a simple structure and compact, light weight, inexpensive and easily to maintain false, etc., it has been widely used in motorcycles. Therefore carrying out a motorcycle rubber V-Belt Continuously Variable Transmission design research has very practical significance. This paper has mainly carried on the following research work:①First, the belt of the belt drive was made a force analysis, both the belt force balance equation and the loose, tight side tension mathematics expressions were obtained, then the entire motorcycle rubber V-Belt Continuously Variable Transmission’s efficiency expression was calculated.②By analyzing the secondary clutch’s structure, working principle and process, the torque load sensor body design principle was proposed; based on force balance, the secondary clutch load torque sensor design method of structural parameters was introduced; obtained the impact of the law of the force acted on the secondary clutch about various parameters by the simulation analysis about the forces acted on the secondary clutch, while the agencies to improve the methods of structural design obout the load torque sensor was obtained.③By analyzing the primary clutch’s structure, working principle and process, the ratio change flywheel design principle was proposed; the primary clutch ratio change flywheel design functions of structural parameters were introduced based on force balance; took a simulation analysis about the problem using ratio change flywheel, then the dual quadrant clutch weight technology was introduced.④On the base of the given parameters of the vehicle, engine and transmission, the maching strategy and the specific matching method were formulated, and a goal of the changes of the speed ratio was set up, a simplified and practical force model of the transmission was formulated, and the force balance between various forces and pully axial force determination under the conditions of inputting different torque and ratio were formulated,too.⑤The simulation model of the program about the rubber V-Belt CVT was established, the dynamics and drive cycle simulation about the vehicle and the simulation of the axial force in the engine full throttle, the engine issue maximum power condition were carried out on the base of application of the primary and secondary different parameter’s influence of axial force. For the initial phase of ratio change flywheel can not take the initiative to provide sufficient force to overcome the driven belt pulley on the force of the shift, comparison of simulation using dual quadrant flyweight technology and decreasing touch point technology were carried out respectively. Finally, the entire design process has been done, clearing the design progress.更多还原