Static Pressure Support Slipper System With Constant Differential Oil Supply Study On Static And Dynamic Characteristics

Axial piston pump is the most common and the most important power component in hydraulic control system,widely used in a variety of mechanical devices,is a classic positive displacement fluid machinery,its basic working principle is the swash plate to promote the plunger reciprocating motion to promote the pump suction and discharge process,complete the establishment of system pressure,slipper pair as an intermediate link to connect the swash plate and plunger,Its lubrication and vibration characteristics are very important.At present,the static pressure bearing slipper system adopts the form of fixed damping and variable damping in series.Under bad working conditions,the system has poor adaptability to oil supply pressure,insufficient bearing capacity,and easy to cause friction damage.Therefore,a static pressure bearing slipper system with constant pressure difference is proposed,and the feasibility of its principle is simulated and verified.The purpose is to improve the bearing capacity and stiffness of the oil film,reduce wear,increase the working life of the slipper and improve the comprehensive performance of the axial piston pump,and provide a scheme for the structural optimization of the axial piston pump.The main research content of this paper is as follows:(1)The working principle of static pressure bearing slipper system with constant pressure difference is introduced.The static model and lubrication dynamics model of slipper system are established based on the design of static pressure bearing,and the dynamic model of slipper pair is established based on the control theory.(2)Elaborate the specific mechanical vibration forms of axial piston pump,study the calculation of a single vibration source which is the mechanical vibration generated by the imbalance and eccentricity of the pump rotating body,construct the mechanical vibration transfer path model under the two systems,and compare the physical model and mathematical model of the two systems.(3)Matlab was used to simulate the static and dynamic model of the new slipper system,and the influence of different structural parameters on the static and dynamic characteristics and vibration characteristics of the system was studied.The static characteristics(bearing capacity and oil film stiffness),dynamic characteristics(step characteristics and frequency characteristics)and vibration characteristics(time-frequency domain)of the new slipper system were compared with the traditional slipper system.(4)A new test scheme is designed according to the existing slipper friction and wear state simulation test platform.The measured vibration signals and oil film thickness are processed and compared with the simulation results to verify the correctness of the proposed theory.