叉车液力传动系统匹配研究

发布时间：2019-02-18 22:48

【摘要】：叉车作为一种工业车辆，由于生产批量较小，其专用发动机和液力变矩器的品种规格少，选择余地小，同时两者匹配及其与传动系统的匹配是否合理，又影响着叉车的动力性能和燃油经济性。因此本文针对叉车几种固定型号发动机和液力变矩器及不同的传动系统进行组合匹配研究。首先根据叉车用发动机和液力变矩器的特点，建立发动机特性数学模型；深入研究液力变矩器的外特性、原始特性、全特性和输入特性，并建立原始特性和输入特性的数学模型；给出发动机和液力变矩器匹配原理、原则和影响匹配的关键因素，提出合理的匹配计算方法。其次分析叉车传动系统速比对叉车动力性能的影响，根据叉车极限行驶状态的要求，，建立传动系统总速比、变速箱最低档速比和最高档速比的计算表达式；提出叉车动力性能评价指标和燃油经济性模拟计算方法；以5吨液力传动叉车为例，进行匹配计算，验证计算方法的正确性。最后以VC++6.0为开发平台，进行叉车液力传动系统匹配软件设计，仿真模拟发动机外特性曲线、液力变矩器特性曲线和匹配特性曲线。采用目标规划法，建立叉车动力性能综合评价函数。利用程序，快速实现发动机、液力变矩器的选型和不同传动系统方案的确定，避免了以往手工计算带来的繁琐，缩短了产品开发周期。
[Abstract]:As a kind of industrial vehicle, forklift truck has less special-purpose engine and torque converter and less choice because of its small batch production. At the same time, the matching between the two and the transmission system is reasonable. It also affects the power performance and fuel economy of forklift truck. In this paper, several fixed type forklift engines, hydraulic torque converters and different transmission systems are studied. Firstly, according to the characteristics of forklift engine and hydraulic torque converter, the mathematical model of engine characteristics is established. The external characteristic, original characteristic, full characteristic and input characteristic of hydraulic torque converter are studied deeply, and the mathematical model of original characteristic and input characteristic is established. The matching principle, principle and key factors affecting the matching between engine and hydraulic torque converter are presented, and a reasonable matching calculation method is proposed. Secondly, the influence of the speed ratio of the forklift transmission system on the dynamic performance of the forklift truck is analyzed. According to the requirements of the ultimate driving state of the forklift truck, the calculation expressions of the total speed ratio of the transmission system, the lowest gear ratio of the transmission box and the maximum speed ratio are established. The dynamic performance evaluation index and fuel economy simulation calculation method of forklift truck are put forward, and the validity of the calculation method is verified by matching calculation with 5 ton hydraulic forklift truck as an example. Finally, the matching software of hydraulic transmission system of forklift truck is designed on the platform of VC 6.0, and the engine external characteristic curve, hydraulic torque converter characteristic curve and matching characteristic curve are simulated and simulated. A comprehensive evaluation function of forklift truck dynamic performance is established by using objective programming method. By using the program, the selection of engine, hydraulic torque converter and the determination of different transmission system schemes are realized quickly, which avoids the red tape brought by manual calculation in the past and shortens the product development cycle.
【学位授予单位】：太原科技大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH242

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