The hydrostatic/hydrodynamic behaviour of an axial piston pump slipper with multiple lands

Bergadà, Josep M.; Watton, J.; Haynes, J. M.; Davies, D. L. I.

doi:10.1007/s11012-009-9277-0

Cited by 64 publications

(33 citation statements)

References 24 publications

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“…While with positioning the groove near the outer slipper boundary, decreasing the groove width increases the slipper force and consequently decreases the leakage [9]. Later on a CFD is developed and enabled to deal with any number of grooves [10].…”

Section: Swashplate-slipper Pairmentioning

confidence: 99%

Computer Aided Design of Axial Piston Machines Having a Roller Piston Bearing

Elashmawy¹

2015

IJMEA

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Swashplate axial piston machines are simple, compact and low price. This simplicity is at the expense of piston transverse forces which limits machine characteristics. The aim of this study is to propose more effective developed design using roller piston bearing. Ball bearing was proposed to reduce transverse forces acting on the piston end of the axial piston machines. The proposed roller bearing design will provide line contact bearing between roller and cam contour compared to point contact of ball bearing arrangement. The roller runs on a flat surface contour formed on the swashplate which is simpler in manufacturing process. The sliding friction between swashplate and slipper is replaced by a rolling friction between roller and runway of cam surface contour. Results show the feasibility of the developed design. The proposed design promises to increase the pressure limitation of the ball bearing arrangement. Parameters such as piston displacement, cam action angle are the same for both roller and ball piston bearing. A comparison analysis was also performed between two alternative cam contours, sinusoidal and linear piston displacement. The selection criterion was based on piston transverse torque. Results show that sinusoidal piston displacement is much better choice than the linear one.

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Section: Swashplate-slipper Pairmentioning

confidence: 99%

Computer Aided Design of Axial Piston Machines Having a Roller Piston Bearing

Elashmawy¹

2015

IJMEA

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“…The method proposed allows the behavior of the slipper grooves and the second land to be defined without the necessity of having the second land vented. The basis of the theory was outlined in Bergada and Watton (24)- (26) and Watton (27) for flat slipper and in Bergada and Watton (28) for tilted slipper. Consider Fig.…”

Section: Flow and Pressure Distribution On Multiple Land Slippers Mamentioning

confidence: 99%

Leakage and Groove Pressure of an Axial Piston Pump Slipper with Multiple Lands

Bergadà¹,

Haynes

Watton

2008

Tribology Transactions

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This article presents a new analytical model, based onReynolds equation of lubrication, to evaluate the leakage and pressure distribution for an axial piston pump slipper taking into account the effect of nonvented grooves. The equations consider slipper spin and tilt and are extended to be used for a generic slipper with any number of grooves. A test rig has been designed and used to check experimentally the applicability of the theoretical equations and comparisons between theoretical and experimental results show a good agreement. The new theory can predict slipper leakage and pressure inside the groove with a high level of accuracy, especially at the very low slipper tilts that exist in practice. Experimentally, it is demonstrated that although a groove maintains a constant pressure along its path, under abnormal conditions the pressure differential can exist inside the groove. The effect of tangential velocity on groove pressure and slipper leakage is then studied experimentally, showing that as the rotational speed increases, there is a small decrease in leakage and a small increase in the average pressure inside the groove.

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“…Bargada et al developed a generic analytic method for predicting the leakage rate of the slipper pair, and the results showed that the main source of the leakage in piston pumps is whether the slipper‐swash plate or the barrel‐port plate, producing over 94% of the total leakage. Another work by Bargada et al investigated the leakage and lift characteristic of the grooved slipper. Kumar et al studied the pressure and leakage characteristics of the slipper with a groove by considering the effect of the slipper spinning speed.…”

Section: Introductionmentioning

confidence: 99%

Power loss characteristics analysis of slipper pair in axial piston pump considering thermoelastohydrodynamic deformation

Tang

Ren

Xiang

2019

Lubrication Science

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The power loss characteristics of slipper pair in an axial piston pump considering the thermoelastohydrodynamic deformation are investigated based on a transient power loss model. The simulation results indicate that the leakage power loss of the slipper pair increases with increasing the thermoelastohydrodynamic deformation. The viscous friction power loss decreases with an increase in the thermoelastohydrodynamic pressure. The viscous friction becomes sufficiently large under the influence of slipper surface roughness that it leads to an increase in viscous friction power loss. The pump displacement decreases with increasing the leakage rate and results in higher leakage power loss and higher friction power loss. To achieve minimum power loss in the slipper, an objective optimization study using Newton's method is applied to calculate structural parameters such as slipper inner diameter, slipper outer diameter, and orifice diameter. The proposed structural parameter optimization can be used as theoretical evidence for slipper pair design.

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The hydrostatic/hydrodynamic behaviour of an axial piston pump slipper with multiple lands

Cited by 64 publications

References 24 publications

Computer Aided Design of Axial Piston Machines Having a Roller Piston Bearing

Computer Aided Design of Axial Piston Machines Having a Roller Piston Bearing

Leakage and Groove Pressure of an Axial Piston Pump Slipper with Multiple Lands

Power loss characteristics analysis of slipper pair in axial piston pump considering thermoelastohydrodynamic deformation

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