斜盘式轴向柱塞泵伺服变量特性

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.