斜盘式轴向柱塞泵伺服变量特性

Servo Variable Displacement Characteristics of Swash Plate Axial Piston Pump

伺服变量是斜盘式轴向柱塞泵常用的变量方式,将直接影响到泵的整体性能。伺服变量技术原理复杂,目前仍是阻碍我国斜盘式轴向柱塞泵发展的关键技术。针对高压轴向柱塞泵研发试验过程中遇到的变量压力冲击较大、无法完全制动等,深入研究探索不同因素对变量特性的影响。将动态过程分为启动过程、回位过程、制动过程和制动恢复过程,利用系统建模仿真AMEsim软件建立变量机构数值模型,并通过压力曲线试验和仿真结果对比证实模型的有效性。在不同进口阻尼、回油阻尼、回位弹簧刚度条件下,对伺服变量系统进行了数值模拟。研究结果表明:进口和回油阻尼对变量动态过程均产生影响,弹簧刚度主要对制动过程有影响。

Servo variable displacement is the most commonly used variable displacement mode for swash plate axial piston pumps and has a direct influence on the pump’s performance. However, its mechanism is complicated, making it still a major obstacle to the development of swash plate axial piston pumps in China. To address challenges in the development and testing of high-pressure axial piston pumps such as high variable pressure shock and inability to brake completely, in-depth research is conducted to understand the impact of different factors on the variable displacement characteristics. The dynamic process is divided into four phases: the starting process, return process, braking process, and braking recovery process. The numerical model of the variable displacement mechanism is established by using AMEsim, and the validity of the model is verified by comparing the pressure curve test and simulation results. The servo variable displacement system is simulated numerically under different conditions of inlet damping, return damping, and return spring stiffness. The results show that both inlet and return damping affect the dynamic process of variable displacement, and the spring stiffness mainly affects the braking process.