Study On Thermal-Elastohydrodynamic Lubrication Characteristics Of Valve Plate Pair Of Balanced Double-Row Axial Piston Pump

The valve plate pair composed of rotating cylinder block and valve plate is one of the three main friction pairs in piston pump.It is not only the most important link to complete the suction and discharge of the piston pump,but also the most complex link in the force of piston pump.With the increase of cylinder block speed and working pressure,the coupling influence between the structural field,flow field and thermal field inside valve plate pair is increasing,and the problems of deformation,wear,leakage and temperature rise of the mating surface are becoming more and more obvious.Therefore,the coupling relationship between the physical fields in valve plate pair was established,and the influence law of working condition,temperature,structure and other factors on the lubrication performance of oil film was analyzed,so as to reveal its internal lubrication mechanism,so as to provide reference for the development of high-performance balanced double-row axial piston pump.The main work is as follows:The background and significance of the research on the flow distribution mechanism of balanced double-row axial piston pump and the technical difficulties of the research are described,the main structural classification of axial piston pump valve plate pair,the flow field analysis of axial piston pump valve plate pair and the current status of domestic and international research on friction lubrication characteristics are reviewed,and the source of the subject,the purpose of the research and the content of the research are outlined.Considering the solid elastic deformation,a balanced double-row axial piston pump cylinder block dynamics model,valve plate pair oil film thickness model,Reynolds equation and other valve plate pair lubrication characteristics models were established.Through the bidirectional coupling model of valve plate pair flow field and oil film micro-deformation field,the numerical model of valve plate pair lubrication characteristics changing with time was studied.Considering the elastic deformation of cylinder block and valve plate,the power loss of valve plate under different working conditions was obtained,and the influence of inclination angle of swash plate on the lubrication characteristics of valve plate was analyzed.A thermal-elastohydrodynamic lubrication model was established by considering the effects of hydrodynamic lubrication,thermoelastic deformation and thermal effects,such as the oil film pressure control equation,energy equation and solid heat conduction equation for valve plate pair of balanced double-row axial piston pumps.The discrete forms of each numerical model are derived,the methods to solve the elastic deformation and thermal-deformation are given,the pressure boundary and temperature boundary conditions of valve plate pair are defined,and the calculation process of the model is introduced.Based on the established numerical calculation model of valve plate pair of balanced double-row axial piston pump,the thermal-elastohydrodynamic lubrication was solved by methods of numerical calculation and simulation.The influences of cylinder block speed,working pressure,boundary temperature and sealing band width on friction,leakage characteristics and oil film temperature field of valve plate pair were analyzed.Figure [40] table [4] reference [116]...