Friction and Wear Properties of Valve Pair of Piston Pump Under Oil Film Fracture Conditions
In order to explore the contact condition and wear of the valve pair when the oil film ruptures during the operation of the valve pair of the axial piston pump.According to the valve pair in the actual working conditions,a flow-thermal-mechanical coupling model of the valve plate and the cylinder block friction pair and a wear prediction model based on the degradation coeffi-cient are established.Analyze the temperature rise,stress,strain and wear of the distribution pair under boundary conditions(oil film rupture).The influence of temperature rise on stress,strain and wear is also analyzed.The research results show that the stress and strain of the valve pair change periodically with the pressure of the plunger cavity.In the case of oil film rupture,the maximum temperature rise of the cylinder rotating 360°is 30.560℃.The maximum stress of the valve plate is 90.046MPa,which is an increase of 21.310MPa compared with the stress without considering the temperature rise.Moreover,the stress stratification of the valve plate is significant,which causes the deformation and differentiation of the valve plate.The deformation mainly oc-curs in the sealing zone outside the oil discharge area of the valve plate.Through the analysis of the wear model,the 360°wear of the cylinder under oil film rupture is 0.0033mg,which is 0.0009mg more than the wear without considering the temperature rise,indicating that the temperature will increase the wear.
High Pressure Axial Piston PumpBoundary LubricationFlow-Thermo-Mechanical CouplingDeg-radation CoefficientWear Prediction
万方数据
维普
