Research On Functional Property Of A11VO190Piston Pump

Abstract:Axial piston pump is the unity of body and fluid, and its structure is very complicated. The body deliver the motion and energy to the fluid. The fluid provide dynamic lubricant film to improve the friction conditions of the friction pairs, and pass flow and pressure to do work, so it is the high-tech hydraulic components. In recent years, the demand for axial piston pump is very strong. The requirements are also getting higher and higher. To improve the overall performance of axial piston pump become more and more urgent, so it is necessary to research the functional property of the piston pump to improve its performance.Virtual prototype technology was used to research the fluid and body property of the axial piston pump. Provided some help for the structure design and optimization of piston pump. The content of thesis as follows:The transfer process of the fluid power in piston pump was analyzed. The model of its torque, single piston flow model, velocity model, valve plate model, load model and the volumetric efficiency model were built, and then the fluid transmission model was established. In addition, based on the two dimensional Reynolds equation and the structural characteristics of piston pairs, the film pressure distribution model of the piston pairs were created by the dimensionless way.The three dimensional model of the axial piston pump was established. The multi-body dynamics model was built by defining constraints, force and drives. Combined with the fluid transfer model, the solid-fluid coupling joint simulation model was build, so as to improve the accuracy of the simulation. As for the important components in the piston, the plunger and valve plate were flexible body, the rigid-flex coupling dynamic model was built.Conduct with the established virtual prototype simulation model, the swash plate angle, working speed and the load pressure influence on the fluid properties were studied, include pulse, leakage, volumetric efficiency, etc. The pulse is around15%, and the volumetric efficiency is above0.96. The film pressure distribution of the plunger gap was analyzed, and the plunger eccentric angle, rotation speed and load effects of the film pressure were studied. Research shows that, in the axial direction, the oil film pressure decreased gradually. In the circumferential direction, the oil film has the peak pressure, oil film pressure at two ends of the plunger has180°phase difference in the circumferential direction. In addition, the flexible model of the plunger and valve plate were analyzed, the strength and deformation law of the plunger and valve plate were studied. The maximum stress of the plunger is518.47MPa, the maximum strain is0.003. The maximum stress of the valve plate is653MPa, the maximum strain is0.004.To verify the correctness of the fluid transmission model of the piston pump, the zero load characteristics of the piston pump was tested, verify its output volume. The volumetric efficiency of the piston pump was tested with progressively increasing load at rated speed, and the flow at nominal lodal pressure was tested. Figure55, Table4, reference84.