基于用户使用工况的ZL50装载机传动比设计

Transmission ratio design of ZL50 Loader based on working condition

为了优化装载机各挡传动比,提出基于使用工况的传动比重新设计。装载机在Ⅱ、Ⅲ挡工作时,通过试验得到前、后桥左右半轴转矩曲线和转向泵、变速泵、工作泵压力曲线。基于分布概率计算出Ⅱ、Ⅲ挡时总转矩概率平均值,根据发动机和液力变矩器共同工作时的输入、输出特性,找出输出特性最低油耗点及其对应的输出转矩。保持Ⅰ、Ⅳ挡传动比不变,按照Ⅱ、Ⅲ挡总转矩概率平均值与最低油耗点对应的转矩相匹配的原则,计算出Ⅱ、Ⅲ挡传动比分别为2.433和1.264。经仿真计算,装载机在循环工况下,按新传动比工作的耗油量为13.85 L/h,比原来降低了1.33 L/h。新设计的传动比提高了装载机的燃油经济性。

In order to optimize loader transmission ratio,the transmission ratio was redesigned based on using condition.When the loader worked in gearⅡ and III,the left and right axle shaft of the front and rear bridge torque curves,and the steering pump,variable speed pump and the work pump pressure curves were tested and recorded.The probability torque average values were calculated by the probability distribution,then the input and output characteristics were obtained when the engine and the torque converter working together,and the minimum fuel consumption point of the output torque and the corresponding output torque value were found.Maintaining gear I and IV transmission ratio unchanged,in accordance with the principle of the gear II and III probability torque average value was matched with the torque of the lowest fuel consumption point in the working together output characteristics,the loader gear II and III transmission ratio were redesigned,and the values were 2.433 and 1.264 respectively.By simulating,the fuel consumption of the loader working under the new transmission ratio in the loop condition was 13.85L/？h,which decreased 1.33 L/h than the original.The new design can improve the fuel economy.