Design and Research of Four-Way Symmetric Loading Hydraulic Cylinder

Hydraulic cylinder is actually equivalent to a hydraulic spring in hydraulic servo system,and the natural frequency of the hydraulic spring is one of the most important factors influencing the servo valve testing system. In the dynamic pressure feedback servo valve testing system,the maximum test signal of the servo valve is limited by the hydraulic pressure spring natural frequency. Therefore,a reasonable design of the structure and meeting the natural frequency of hydraulic cylinder are of great significance. Based on this,we can calculate the total volume of the hydraulic cylinder based on the measured flow rate and the maximum feedback pressure of servo valve.By hydraulic cylinder natural frequency and the total volume,and ultimately we can get piston diameter,rod diameter and stroke of hydraulic cylinder. This paper designed a four-way symmetric loading hydraulic cylinder which is specifically applicable to the testing of dynamic pressure feedback servo valve. It has been useed in feedback servo valve testing system,and achieving the expected results.