Analysis Of Mechanical And Lubricating Characteristics Of Double-stator Blade Pump With Connecting Rod Roller

Integrated-Electrical Hydrostatic Actuator is an energy-saving and environment-friendly pump control system,but it is widely used in many fields.The application of the asymmetric cylinder in this new system is limited because of the difference in effective area between the two chambers of aysmmetric cylinders.This paper firstly aims at the asymmetric flow of two asymmetric cylinders cavity,a double-stator pump controlled asymmetric cylinders system is proposed and designed on the basis of the double-stator vane pump with connecting rod roller,and theoretical analysis and mathematical model of the system is established.The double-stator vane pump with connecting rod roller is a core component of the double-stator pump controlled asymmetric cylinder system,its performance is a key factor affecting the new system.This paper designes the inner and outer stator curves of this pump based on the structural principle of this pump,the three-dimensional model of the pump is established by using Solidworks,and the kinematics analysis is performed on its motion components.The pressure changes of the closed chamber caused by the stator transition curve and damping tank and gap leakage is calculated and analyzed by using Matlab.Based on this,the mechanical properties of the inner and outer rollers and connecting rods of the roller connecting rod group at different positions in one action cycle are analyzed.Combined with the actual comditions of the double-stator pump controlled asymmetric cylinder system,specific numerical calculation of the contact side effect force of the roller connecting rod group is carried out,and the dynamic model of the roller linkage is obtained.The connecting rod and hydraulic pump are finite element analyzed by using Ansys Workbench,and the analysis shows that the contact force and poor lubrication states of the roller connecting rod group.Combined with the lubrication theory and the structure and the operating parameters,the contact lubrication status of the roller connecting rod group is analyzed based on the dynamic model of the roller connecting rod group.The lubrication characteristics such as the minimum oil film thickness and the film thickness ratio of the contact of roller-stator and roller-connecting rod are obtained.According to the theoretical analysis and numerical calculations of this paper,an experimental test system for the no-load displacement and efficiency of the double-stator vane pump with connecting rod roller are designed and built.The mechanical efficiency and volumetric efficiency curves of this pump with the same and different load pressures between inner and outer pump are measured and analyzed,and the friction torque under the two working conditions is calculated.It provides a theoretical basis for the design of the pump components and systems,the selection of lubrication conditions and the setting of operating parameters,which also satisfies the requirements of the double-stator pump controlled asymmetric cylinder system.