Tribological Properties Analysis And Structural Optimization Of A11VO190Axial Piston Pump’s Slipper Pair

Abstract:Slipper-swash plate pair is one of the main friction pairs in axial piston pumps. The friction, lubrication and wear characteristics of this friction pair are very important. The paper combines the key technical issues of high pressure and high flow pump raised by the defense advanced research project and selects the A11VO190axial piston pump as the research object to study the tribological properties of slipper-swash plate pair. Then optimizes its structure, and the main contents of this paper are as follows:The motion and load characteristics are analyzed according to the working principle and structural characteristics of the A11VO190axial piston pump’s slipper. And the influence of different working conditions (such as speed, load pressure, friction coefficient) on slipper performance are compared.The friction and lubrication properties of slipper at fluid lubrication and boundary lubrication state are researched respectively. Both the thickness of oil film at the bottom of slipper, and the leakage and power loss between the slipper and swash plate are calculated at fluid lubrication state. Then the effect of different working condition on slipper performance are compared. Then the real contact situation between slipper and swash plate at boundary lubrication state is researched.A three-dimensional model of the slipper oil film is established and meshed by structured grid in the software Gambit, then imports the data to CFD to make a simulation, and obtains the velocity vector diagram and pressure contours of oil film. Then the slipper’s sealing tape and auxiliary support tape are optimized with a reasonable target pv value at the premise without changing the film flow distribution, and the hydrostatic support force of optimized slipper increases by8.65%, and the contact pv value decrease by65.2%.50hours full capacity test and50hours impact test are operated. After the test, the pump is disassembled and the wear amount at the bottom of the slipper is measured to verify the main results and conclusions of the study.