Analysis Of Oil Film Dynamic Characteristics Of Slipper Pair In Axial Piston Pump Based On Multiphysics Coupling

Axial piston pumps are widely used in high-power,high-energy heavy equipment in key areas of national economic construction,such as aviation,mining,metallurgy,and engineering construction.As the whole equipment develops in the direction of high pressure and high reliability,axial piston pump are put forward higher requirements.However,there are three friction pairs inside the axial piston pump: slipper pair,plunger pair,and flow distribution pair.Especially the slipper pair has been operating under high-speed and heavy-duty conditions for a long time,and excessive wear of the slipper pair components and instability of operation frequently occur.Lubrication failure and other problems,which eventually lead to a series of problems such as increased internal friction power loss and leakage of the axial piston pump,and the system pressure cannot be established,which seriously affects the working performance of the axial piston pump,and even causes the entire The system is down.Therefore,the research on the lubrication characteristics of the slipper pair in the piston pump has high theoretical value and important practical significance.At present,there are many studies on the lubricant film lubrication characteristics of the slipper pair at home and abroad,but most of them are limited to isothermal conditions,without considering the coupling effects of multi-physics caused by harsh conditions such as high speed,high pressure,and high temperature,and ignoring the thermal-mechanical coupling deformation.And problems such as surface damage and failure.Therefore,this article focuses on the analysis of the dynamic characteristics of the oil film of the slipper pair of the axial piston pump under the coupling effect of multiphysics.Mainly complete the following tasks:(1)Study the mathematical characterization of the oil film lubrication of the slipper pair of the axial piston pump.According to the movement principle of the slipper pair,the Reynolds equation of the slipper pair oil film is established to express the dynamic pressure support of the slipper pair oil film,and the Reynolds equation is numerically solved by the finite difference method to obtain the pressure distribution of the slipper pair oil film;(2)Study the dynamic characteristics of the oil film of the slipper pair under the coupling effect of multi-physics.The two-dimensional Laplace equation is used to study the temperature distribution of the oil film and the deformation of the bottom surface of the slipper,and the oil film thickness of the slipper pair under the influence of the temperature field is obtained,and the Reynolds equation is substituted for the solution of the oil film pressure field.Study the coupling relationship between the slipper pair oil film dynamic pressure support and the slipper pair dynamics under the action of temperature field,solve the shoe balance equation,obtain the oil film pressure field and thickness field under different conditions,and analyze temperature,load pressure,speed,etc.The influence of parameters on the characteristics of the oil film,revealing the multi-physical coupling mechanism of the slipper pair oil film;(3)Numerical simulation method to study the dynamic characteristics of slipper pair oil film.According to the research results of the multi-physics coupling mechanism and dynamic characteristics of the slipper pair oil film,the MATLAB numerical simulation program is compiled to numerically solve the Laplace equation,the Reynolds equation,and the slipper balance equation to obtain the dynamic visual representation of the slipper pair oil film characteristics;(4)Research the experimental method for testing the characteristics of the oil film of the slipper pair of the axial piston pump.Since it is difficult to directly test the physical field parameters of the auxiliary oil film of the slipper,this project is to build an experimental platform for the characteristics of the auxiliary oil film of the slipper to study the measurement of the slipper auxiliary oil film parameters through indirect testing methods,and compare them with the simulation data to verify the theoretical model and simulation The correctness of the data,on this basis,optimize and improve the internal structure of the slipper pair to obtain a more reasonable slipper pair structure.