Research On Dynamic Characteristics Of Slipper Pair Of Swashplate Axial Piston

When the swashplate axial piston pump works,the plunger chamber will experience continuous high and low pressure switching.When the pressure changes from low to high pressure,the bottom of the plunger is subjected to the instantaneous impact of high pressure,which may make direct contact between the slide slipper and the swash plate and destroy the lubrication,thus affecting the life of the plunger pump.There is a lubricating oil film between the slide slipper and swash plate,and the existence of this oil film avoids direct contact between the plunger slide slipper assembly and the plunger bottom pressure impact,which plays the role of lubrication and support for the slide slipper.The study of the lubrication characteristics of the oil film of the slide slipper is of great significance to improve the overall performance of the piston pump.This paper takes the sliding slipper sub-lubricating film of swashplate axial piston pump as the research object,and establishes the mathematical model of the squeezing effect of the sliding slipper sub-lubricating film through theoretical derivation on the basis of kinematic analysis and kinetic analysis of the sliding slipper plunger assembly,and builds the solution model of the squeezing effect of the sliding slipper sub-lubricating film through the Simulink module in MATLAB,and through the nonlinear method,the The dynamic characteristics of the oil film are solved theoretically.The effects of different structural parameters,oil viscosity and oil compressibility on the pressure building process,oil film thickness and oil film leakage are analyzed to reveal the influence of the squeeze effect on the lubrication characteristics of the sub oil film of the slide slipper.The main contents of the paper are.(1)The thesis discusses the influence of the squeeze effect on the dynamic characteristics of the sub oil film of the slide slipper,and establishes a theoretical model of the squeeze effect of the sub oil film of the slide slipper by analyzing the dynamics of the plunger slide slipper assembly under the squeeze effect,through the pressure transfer equation and the flow continuity equation without considering the overturning effect,which takes into account the influence of the structural parameters of the plunger slide slipper and the medium viscosity,etc.(2)Relying on MATLAB software,a nonlinear modeling of the squeezing effect of the slide slipper sub-film is carried out in the Simulink module to solve the dynamic characteristics of the slide slipper sub-film.The pressure distribution in the seal zone generated by the squeezing effect of the slip-slipper sub oil film and the support force generated by this pressure distribution are solved.The effects of different structural parameters,oil viscosity,oil compressibility and other factors on the sub oil film characteristics of the slide slipper in the presence of the squeeze effect are analyzed,and the lubrication characteristics of the sub oil film under the squeeze effect are revealed by the pressure build-up in the oil chamber at the center of the slide slipper,the oil film thickness,and the oil film leakage.(3)The pressure transfer process under different working conditions is analyzed.Different pressure shocks,oil viscosity,gas content,etc.were selected to study the effect of pressure transfer and reveal its influence on the pressure transfer in the extrusion process.The results show that: with the increase of the pressure shock value,the response speed of the pressure in the oil cavity at the center of the slide slipper is accelerated,and the thickness of the oil film and the leakage of the oil film are reduced;the response time of the pressure in the center of the slide slipper is influenced by different gas contents;with the increase of the dynamic viscosity of the oil,the time used to build up the pressure in the oil cavity at the center of the slide slipper becomes shorter and shorter.