Numerical Simulation of a Slipper Model for Swash Plate Type Axial Piston Pumps and Motors: Effects of Concave and Convex Surface Geometry

Toshiharu Kazama; Yukihito Narita

doi:10.20965/ijat.2012.p0434

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IJAT Vol.6 No.4 pp. 434-439

doi: 10.20965/ijat.2012.p0434

(2012)

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Numerical Simulation of a Slipper Model for Swash Plate Type Axial Piston Pumps and Motors: Effects of Concave and Convex Surface Geometry

Toshiharu Kazama and Yukihito Narita

College of Design and Manufacturing Technology, Graduate School of Engineering, Muroran Institute of Technology, 27-1 Mizumoto-cho, Muroran, Hokkaido 050-8585, Japan

Received:

February 2, 2012

Accepted:

May 11, 2012

Published:

July 5, 2012

Keywords:

slipper, hydrostatic bearing, positive displacement machine, mixed lubrication, tribology

Abstract

In this study, the slipper of swash plate axial piston pumps and motors is modeled as a hybrid (hydrostatic and hydrodynamic) thrust pad bearing. The effects of the slightly concave and convex geometries of the slipper sliding surface are examined. The motion of the slipper model is numerically simulated, and its tribological characteristics are examined under eccentric and dynamic load conditions. The calculations under these conditions indicate that, for the concave slipper, the fluctuation of the bearing pad azimuth increases, and the attitude of the slipper becomes unstable. In contrast, for the convex slipper, the attitude becomes stable, but the clearance increases.

Cite this article as:

T. Kazama and Y. Narita, “Numerical Simulation of a Slipper Model for Swash Plate Type Axial Piston Pumps and Motors: Effects of Concave and Convex Surface Geometry,” Int. J. Automation Technol., Vol.6 No.4, pp. 434-439, 2012.

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References

[1] N. Iboshi and A. Yamaguchi, “Characteristics of a Slipper Bearing for Swash Plate Type Axial Piston Pumps and Motors,” Bulletin of Japan Society of Mechanical Engineers, Vol.29, pp. 2539-2546, 1986.
[2] J. A. Williams, “Engineering Tribology,” Oxford Science Publications, 1996.
[3] B. J. Hamrock, “Fundamentals of Fluid Film Lubrication,” McGraw-Hill, 1994.
[4] A. Yamaguchi and H. Matsuoka, “A Mixed Lubrication Model Applicable to Bearing/Seal Parts of Hydraulic Equipment,” J. of Tribology, Trans. of American Society of Mechanical Engineers, 114, pp. 116-121, 1992.
[5] J. A. Greenwood and J. B. P. Williamson, “Contact of Nominally Flat Surfaces,” Proc. of Royal Society, London, Ser. A, 295, pp. 300-319, 1996.
[6] N. Patir and H. S. Cheng, “An Average Flow Model for Determining Effects of Three-Dimensional Roughness on Partial Hydrodynamic Lubrication,” J. of Lubrication Technology, Trans. of American Society of Mechanical Engineers, 100, pp. 12-17, 1978.
[7] N. Patir and H. S. Cheng, “Application of Average Flow Model to Lubrication Between Rough Sliding Surfaces,” J. of Lubrication Technology, Trans. of American Society of Mechanical Engineers, 101, pp. 220-230, 1979.
[8] T. Kazama and A. Yamaguchi, “Experiment on Mixed Lubrication of Hydrostatic Thrust Bearings for Hydraulic Equipment,” J. of Lubrication Technology, Trans. of American Society of Mechanical Engineers, 117, pp. 399-402, 1995.
[9] T. Kazama and A. Yamaguchi, “Application of AMixed Lubrication Model for Hydrostatic Thrust Bearings of Hydraulic Equipment,” J. of Tribology, Trans. of American Society of Mechanical Engineers, 115, pp. 686-691, 1993.
[10] T. Kazama, “Numerical Simulation of A Slipper Model for Water Hydraulic Pumps/Motors in Mixed Lubrication,” Proc. of 6th Japan Fluid Power Systems Society International Symposium on Fluid Power, Tsukuba, CD-ROM, 2C4-5, 2005.
[11] S. Kumar, J. M. Bergada, and J. Watton, “Axial Piston Pump Grooved Slipper Analysis by CFD Simulation of Three-Dimensional NVS Equation in Cylindrical Coordinates,” Computers & Fluids, 38, pp. 648-663, 2009.
[12] K. L. Johnson, J. A. Greenwood, and S. Y. Poon, “Simple Theory of Asperity Contact in Elastohydrodynamic Lubrication,” Wear, 19, pp. 91-108, 1972.

This article is published under a Creative Commons Attribution-NoDerivatives 4.0 Internationa License.

[1] [1] N. Iboshi and A. Yamaguchi, “Characteristics of a Slipper Bearing for Swash Plate Type Axial Piston Pumps and Motors,” Bulletin of Japan Society of Mechanical Engineers, Vol.29, pp. 2539-2546, 1986.

[2] [2] J. A. Williams, “Engineering Tribology,” Oxford Science Publications, 1996.

[3] [3] B. J. Hamrock, “Fundamentals of Fluid Film Lubrication,” McGraw-Hill, 1994.

[4] [4] A. Yamaguchi and H. Matsuoka, “A Mixed Lubrication Model Applicable to Bearing/Seal Parts of Hydraulic Equipment,” J. of Tribology, Trans. of American Society of Mechanical Engineers, 114, pp. 116-121, 1992.

[5] [5] J. A. Greenwood and J. B. P. Williamson, “Contact of Nominally Flat Surfaces,” Proc. of Royal Society, London, Ser. A, 295, pp. 300-319, 1996.

[6] [6] N. Patir and H. S. Cheng, “An Average Flow Model for Determining Effects of Three-Dimensional Roughness on Partial Hydrodynamic Lubrication,” J. of Lubrication Technology, Trans. of American Society of Mechanical Engineers, 100, pp. 12-17, 1978.

[7] [7] N. Patir and H. S. Cheng, “Application of Average Flow Model to Lubrication Between Rough Sliding Surfaces,” J. of Lubrication Technology, Trans. of American Society of Mechanical Engineers, 101, pp. 220-230, 1979.

[8] [8] T. Kazama and A. Yamaguchi, “Experiment on Mixed Lubrication of Hydrostatic Thrust Bearings for Hydraulic Equipment,” J. of Lubrication Technology, Trans. of American Society of Mechanical Engineers, 117, pp. 399-402, 1995.

[9] [9] T. Kazama and A. Yamaguchi, “Application of AMixed Lubrication Model for Hydrostatic Thrust Bearings of Hydraulic Equipment,” J. of Tribology, Trans. of American Society of Mechanical Engineers, 115, pp. 686-691, 1993.

[10] [10] T. Kazama, “Numerical Simulation of A Slipper Model for Water Hydraulic Pumps/Motors in Mixed Lubrication,” Proc. of 6th Japan Fluid Power Systems Society International Symposium on Fluid Power, Tsukuba, CD-ROM, 2C4-5, 2005.

[11] [11] S. Kumar, J. M. Bergada, and J. Watton, “Axial Piston Pump Grooved Slipper Analysis by CFD Simulation of Three-Dimensional NVS Equation in Cylindrical Coordinates,” Computers & Fluids, 38, pp. 648-663, 2009.

[12] [12] K. L. Johnson, J. A. Greenwood, and S. Y. Poon, “Simple Theory of Asperity Contact in Elastohydrodynamic Lubrication,” Wear, 19, pp. 91-108, 1972.