Study of the influence of slipper parameters on the power efficiency of axial piston pumps

Gaston Haidak,Dongyun Wang,Jun Liu,E Shiju

doi:10.1177/1687814018801460

Abstract

This article presents the influence and impact of the gap between the outer and the inner diameter of the slipper on the performance of axial piston pumps. For this, a mathematical model establishing and evaluating the quantities involved in the total power loss is established. Four slippers having a different values of the ratio between their diameters are considered; for which the study and the simulation concerning the fluid film thickness, the forces, the flow and the total power loss between the slipper and the swash plate are developed and compared. After the analysis of all these parameters for different slippers, the results of the simulation show that for each slipper, there are values of the optimum fluid film thickness for which the pump has the minimum in terms of power loss between the slipper and the swash plate. And after the comparison, the favourable ratio between the diameters of the slipper for good lubrication is given. The accuracy between the mathematical model and simulation results is checked, and a discussion is made. Finally, a conclusion based on the results of the lost power is made.

Highlights

The axial piston pump is an essential element of the hydraulic system used in various industrial applications
The slipper is the element ensuring the contact between the piston and the swash plate, it is submitted to several forces which create a perpetual instability; there is a need for good lubrication to both minimize instability and avoid contact between these metals
Given that this study is based much more on the influence of slipper parameters on power loss, more attention will be given to the forces that are a function of slipper diameters and/or involved in the expression of the total power loss between the slipper and swash plate interface

Summary

Introduction

The axial piston pump is an essential element of the hydraulic system used in various industrial applications. Section ‘Numerical model and simulation’ establishes the numerical model starting from the process to the simulation results of the oil thickness, flow, forces, pressure (by solving the Reynolds equation in MATLAB) and the power loss between the slipper and the swash plate for four slippers having a different sealing land. Given that this study is based much more on the influence of slipper parameters on power loss, more attention will be given to the forces that are a function of slipper diameters and/or involved in the expression of the total power loss between the slipper and swash plate interface Equations (16a), (16b) and (17) permit us to calculate the flow Q, and it can be drawn as a function of the pressure difference as follows

Á h Á ln ð18Þ

Accuracy and discussion

Findings

Conclusion