| The swash plate type axial piston pump has the advantages of high rated pressure,high volumetric efficiency,and long life.It is widely used in various engineering fields.Engineering of the slipper within swashplate type axial piston pumps represents the most complex and difficult part of the design process.The sliding interfaces of the slipper are subject to significant normal loads which must be supported while simultaneously preventing component wear to ensure long lasting operation.Therefore,the friction and lubrication pro perties of pair is very important to the design of slippers.However,the complex Multi-physics interactions involved make the problem impossible to describe intuitively.There are many internal influence factors,which brings difficult problems to the des ign.It has been the focus of swashplate axial piston pump research for a long time,which has very important research significance.This dissertation takes the A10 VO model swash plate axial piston pump as the research object.Slippers will involve two friction pairs which are slipperswashplate pair and slipper-piston pair.A numerical model has been developed to predict the behavior of a design.The numerical model considers the coupling mechanism and the transient nature of the slipper structural deformation and thin lubricating film.The simulation of slipper components was performed to predict the possible wear problems of the product in advance.A fluid-solid coupled simulation analysis method for the design of slipper was formed.The design criteria of the slipper components were established.The research results have provided valuable guidance for fabrication of the slipper-swashplate pair and the slipper-piston pair.The main contents of this dissertation are as follows:(1)The working characteristics of the single-sealed slipper are analyzed,the compression force to which the slipper is subjected is calculated,and the segmented physical solution method and integration are used to establish the lubrication model of the ball hinge pair oil film and the sliding film pair oil film lubrication model.Later simulation studies provide numerical basis.(2)The steady-state simulation and transient squeeze simulation of slipper and plungers were performed.The oil film lubricating phenomenon of the ball joint is discussed in detail,and the steady-state support characteristics and squeezing effect of the oil film are specifically simulated and analyzed.The pressure distribution and leakage of the oil film field were obtained.The power loss of the oil film lubrication of the ball joint pair was calculated.The detailed thickness change law of the oil film,the elastic deformation law of the plunger ball head and the dangerous friction band were simulated.The secondary design provides intuitive realistic effects.(3)The steady-state pressure distribution simulation of the oil film field between the slipper and the swash plate was carried out.The transient compression simulation of the auxiliary oil film of the slipper was completed for the oil film squeezing effect,and the compression coefficient was verified.According to the viscosity-temperature characteristics of the oil,the viscosity characteristics of the oil film of the friction pair were analyzed.The flow loss and power loss of the slipper are analyzed.(4)A fluid-structure coupling simulation analysis method of slipper was formed,and the influence of the ball joint hinge oil film and slide shoe oil film pressure field on the strength and elastic deformation of the slide shoe was considered.The effects of different loads and the elastic deformation of the slipper on the lubrication characteristics are analyzed,and the dangerous areas that need attention in the design of the slipper are summarized. |
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