Pressure characteristics in cavity of swash plate axial piston pump with conical cylinder block

ZHANG Zhi-wei1, WU Bing1,2, WANG Jun1,2, HUANG Ke-kang1, SHEN Yu-xi1, LIU Yang1
(1.College of Mechanical and Transportation Engineering, Taiyuan University of Technology, Taiyuan
030024, China; 2.Key Laboratory of New Sensors and Intelligent Control of Ministry of
Education, Taiyuan University of Technology, Taiyuan 030024, China)

Abstract: Aiming at the problem that the oil volume in the plunger chamber changed rapidly when the conical cylinder axial piston pump was working, and the pressure pulsation and pressure impact in the chamber caused the vibration and noise of the plunger pump, AMESim was used to establish the conical cylinder piston pump model. The effects of the tilt Angle of the swash plate, the compressibility and viscosity of the oil on the pressure in the plunger cavity were studied. Firstly, the working principle and kinematic relationship of A4VSO conical cylinder piston pump and the theoretical analysis of the pressure in the plunger cavity were analyzed. Secondly, through the secondary development of AMESim, the original cylinder block module was improved, and the simulation model of axial piston pump with conical cylinder block was established considering the influence of leakage. Finally, the experimental data was used to verify the reliability of the simulation model. The results indicate that with the increase of swash plate angle, oil bulk elastic modulus and dynamic viscosity, the pressure in the cavity increases, and the fluctuation rate of oil bulk elastic modulus changes from 0.6% increase to 0.34% increase.
Key words: conical cylinder; secondary development; bulk elastic modulus; oil viscosity; cavity pressure