液力推土机变速控制系统仿真分析与特性研究

Simulation Analysis and Characteristics Research of Hydraulic Bulldozer Transmission Control System

为研究SD-5履带式液力推土机变速控制系统动态换挡特性,在分析变速阀和离合器结构、工作原理的基础上,利用SimulationX软件搭建变速控制系统的机液联合仿真模型进行研究。分析不同工况下变速控制系统动态换挡特性,以及弹簧刚度、节流孔和快回阀结构参数对换挡特性的影响。研究结果表明:变速控制系统前进挡位具有较好的换挡性能,后退挡位存在较严重的压力冲击;离合器弹簧刚度越大,压力冲击程度越小;节流孔R1是影响调压时间的主要因素;设置节流孔R2能够有效改善后退换挡压力冲击;优化快回阀结构参数可以有效改善压力冲击现象。研究结果为推土机变速系统的性能优化和节能研究提供了参考。

In order to study the dynamic shift characteristics of the transmission control system of the SD-5 crawler hydraulic bulldozer,based on the analysis of the structure and working principle of the transmission valve and clutch,a mechanical-hydraulic co-simulation model of the transmission control system was built by using SimulationX software.The dynamic shift characteristics of the transmission control system under different operating conditions were analyzed,and the influences of spring stiffness,orifice and quick-return valve structural parameters on the shift characteristics were analyzed.The results show that the forward gear of the transmission control system has better shift characteristics,while the reverse gear has more serious pressure shock;the greater the clutch spring stiffness is,the smaller the pressure shock is;the orifice R1 is the main factor affecting the pressure regulating time;the pressure shock of the reverse shift can be effectively improved by setting the orifice R2;the pressure shock phenomenon can be effectively improved by optimizing the structural parameters of the fast-return valve.The research results provide a reference for the performance optimization and energy saving research of the bulldozer transmission system.