装载机变速器功率匹配优化设计及试验研究

发布时间：2019-05-28 03:10

【摘要】：液力变速器作为装载机的核心传动部件,其动力性能直接关系到装载机的使用性能、动力特性、工作效率等,其中液力变速器的变矩器与发动机的功率匹配及优化是重要环节,通过功率匹配可以优化装载机的启动性能、换挡性能、燃油经济性。本文对自行开发的SD50装载机变速器进行了功率匹配与优化,并设计了检验变速器性能的试验平台。介绍了SD50液力变速器的结构特性与工作原理,分析液力变矩器与发动机的特性参数与动力特性的关系,确定变矩器与发动机功率匹配的基本原则：即在保证动力性能优化的前提下兼顾燃油经济性。制定了匹配方法与计算步骤,最后根据SD50变速器的参数选择了康明斯6CT8.3-C215发动机,YJ355L单级单相变矩器和YJSW315-6双涡轮单级双相变矩器进行匹配。根据发动机与液力变矩器的原始特性数据及匹配方法,利用Matlab工具拟合出发动机的输出特性曲线、变矩器的输入特性曲线及共同工作曲线,对两种变矩器进行匹配,并对其匹配后的输出特性进行对比分析,得出结论：YJSW315-6双涡轮单级双相变矩器更符合装载机的工况需求。在匹配工作的基础上,以动力性能作为目标对液力变矩器进行优化设计,运用Matlab工具箱进行优化后,对优化后的动力性能进行评价,证明优化工作提高了变速器动力性能,可以更好发挥发动机的动力。设计了SD50变速器性能试验所需的试验平台,选择开式试验台方案,设计主体结构,选择主要测量仪器,并根据相关国家标准及行业规范,制定了具体的试验方案与试验方法。
[Abstract]:As the core transmission component of the loader, the dynamic performance of the hydraulic transmission is directly related to the performance, dynamic characteristics and working efficiency of the loader. Among them, the torque converter of the hydraulic transmission and the power matching and optimization of the engine are important links. The starting performance, shift performance and fuel economy of the loader can be optimized by power matching. In this paper, the power matching and optimization of the self-developed SD50 loader transmission are carried out, and a test platform for testing the transmission performance is designed. This paper introduces the structural characteristics and working principle of SD50 hydraulic transmission, and analyzes the relationship between the characteristic parameters and dynamic characteristics of hydraulic torque converter and engine. The basic principle of power matching between torque converter and engine is determined, that is, fuel economy is taken into account on the premise of ensuring the optimization of dynamic performance. The matching method and calculation steps are worked out. Finally, Cummins 6CT8.3-C215 engine, YJ355L single phase torque converter and YJSW315-6 double turbine single phase torque converter are selected according to the parameters of SD50 transmission. According to the original characteristic data and matching method of engine and hydraulic torque converter, the output characteristic curve of engine, the input characteristic curve and common working curve of torque converter are fitted by Matlab tool, and the two kinds of torque converter are matched. The matching output characteristics are compared and analyzed, and it is concluded that the YJSW315-6 double turbine single stage dual phase torque converter is more in line with the working conditions of the loader. On the basis of matching work, the hydraulic torque converter is optimized with the goal of dynamic performance. After optimizing the hydraulic torque converter with Matlab toolbox, the optimized dynamic performance is evaluated, which proves that the optimization work improves the dynamic performance of the transmission. It can give full play to the power of the engine. The test platform for SD50 transmission performance test is designed, the open test-bed scheme is selected, the main structure is designed, and the main measuring instruments are selected. According to the relevant national standards and industry specifications, the specific test scheme and test method are worked out.
【学位授予单位】：山东大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH243

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