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

2018 ◽  
Vol 10 (9) ◽  
pp. 168781401880146 ◽  
Author(s):  
Gaston Haidak ◽  
Dongyun Wang ◽  
E Shiju ◽  
Jun Liu
Keyword(s):  
Mathematical Model ◽  
Film Thickness ◽  
Power Loss ◽  
Power Efficiency ◽  
Fluid Film ◽  
Total Power ◽  
Axial Piston Pumps ◽  
Swash Plate ◽  
Fluid Film Thickness ◽  
Axial Piston

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.

Surface Deformations Enable High Pressure Operation of Axial Piston Pumps

2011 ◽  
Author(s):  
Matteo Pelosi ◽  
Monika Ivantysynova
Keyword(s):  
Film Thickness ◽  
Material Properties ◽  
Fluid Film ◽  
Cylinder Block ◽  
Steel Cylinder ◽  
Elastic Deformations ◽  
Piston Cylinder ◽  
Fluid Film Thickness ◽  
The Impact ◽  
Axial Piston

In this paper, a fully coupled fluid-structure interaction and thermal numerical model developed by the authors is used to demonstrate the impact of surface elastic deformations on the piston/cylinder fluid film thickness and on the overall axial piston pump rotating kit performance. The piston/cylinder interface is one of the most critical lubricating interfaces of axial piston machines. This interface fulfills simultaneously a bearing and sealing function under oscillating load conditions in a purely hydrodynamic regime. It represents one of the main sources of energy dissipation and it is therefore a key design element, determining axial piston machine efficiency. In the past years, the research group of the authors studied the impact of advanced micro surface design and fluid film thickness micro alteration in the piston/cylinder interface through extensive simulations and experiments. However, the numerical models used did not include the influence of surface elastic deformations, heat transfer and therefore material properties on the piston/cylinder interface behavior. Hence, the aim of this paper is to show the alterations on fluid film thickness and on the consequent coupled physical parameters due to the solid boundaries pressure and thermal surface elastic deformations. A simulation study considering two different material properties for the cylinder bores is performed, where a steel cylinder block and a steel cylinder block with brass bushings are separately studied. Piston/cylinder gap pressure field and coupled gap surface elastic deformations due to pressure and thermal loading are shown for the different materials. The impact of the different materials behavior on lubricating interface performance is discussed.

Modeling of Swash Plate Axial Piston Pumps With Conical Cylinder Blocks

2004 ◽  
Vol 126 (1) ◽  
pp. 196-200 ◽  
Author(s):  
M. K. Bahr Khalil ◽  
J. Svoboda ◽  
R. B. Bhat
Keyword(s):  
Mathematical Modeling ◽  
Mathematical Model ◽  
Design Tool ◽  
Superior Performance ◽  
Axial Piston Pumps ◽  
Swash Plate ◽  
Pump Mechanism ◽  
Axial Piston

Electrically controlled swash plate axial piston pumps with conical cylinder blocks are recently used in the industry in view of their superior performance. Several studies have been carried out to study the characteristics of such novel pump mechanism. In these studies, partial mathematical modeling is conducted relevant to the points discussed. In the present study, a comprehensive pump mathematical model is developed and experimentally validated. The model could be used as a design tool in order to fully exploit the advantages of the new design.

scholarly journals Optimization and Influence of Micro-Chamfering on Oil Film Lubrication Characteristics of Slipper/Swashplate Interface within Axial Piston Pump

Energies ◽  
2021 ◽  
Vol 14 (7) ◽  
pp. 1961
Author(s):  
Jihai Jiang ◽  
Zebo Wang
Keyword(s):  
Numerical Model ◽  
Film Thickness ◽  
Power Loss ◽  
Piston Pump ◽  
Total Power ◽  
Axial Piston Pump ◽  
Oil Film ◽  
Friction Power ◽  
Lubrication Characteristics ◽  
Axial Piston

The overturning and eccentric abrasion of the slipper worsens the lubrication characteristics and increases the friction power loss and kinetic energy consumption of the slipper/swashplate interface to reduce the axial piston pump efficiency. A coupling lubrication numerical model and algorithm and a micro-chamfering structure are developed and proposed to predict more precisely and improve the lubrication characteristics of the slipper/swashplate interface. The simulation results reveal that the slipper without micro-chamfering overturns and contacts with the swashplate, while the one with micro-chamfering forms a certain oil film thickness to prevent this contact effectively. The minimum total power loss of the slipper/swashplate interface has to be effectively ensured under the worst working conditions, such as the high pressure, the low speed, the maximum swashplate inclination angle and the minimum house pressure. The optimal micro-chamfering width and depth are 1.2 mm and 3.5 μm or C1.2-3.5, the simulation average oil film thickness of which is approximately equal to the optimal analytical value. The experimental friction power loss of the slipper/swashplate interface is basically consistent with the simulation one, confirming the correctness and effectiveness of the coupling lubrication numerical model, and the optimization method and providing the further design direction of axial piston pumps.

scholarly journals Virtual Assessment and Experimental Validation of Power Loss Contributions in Swash Plate Type Axial Piston Pumps

Energies ◽  
2019 ◽  
Vol 12 (16) ◽  
pp. 3096
Author(s):  
Daniel Hasko ◽  
Lizhi Shang ◽  
Eric Noppe ◽  
Emmanuel Lefrançois
Keyword(s):  
Power Loss ◽  
Chamber Pressure ◽  
Hydraulic Unit ◽  
Axial Piston Pumps ◽  
Swash Plate ◽  
Independent Evaluation ◽  
Effective Development ◽  
Axial Piston ◽  
Plate Type

The understanding of the power loss contributions of each loss source is essential for an effective development of swash plate type axial piston pump. However, it is difficult to obtain the assessment of the power loss distribution due to the lack of methodologies that allow an independent evaluation of each source. This paper addresses this challenge using the most recent simulation methods. It describes the determination of each source, along with the corresponding loss of performance, and the principle of their prediction during the design phase. It also reports the validation of the simulation model by comparing the simulated dynamic displacement chamber pressure and the solid body temperature distribution with measurements obtained from a special pump prototype. This proposed virtual assessment of power loss contributions is demonstrated on a commercial hydraulic unit and the detailed results are reported in this paper.

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