Tipping the Cylinder Block of an Axial-Piston Swash-Plate Type Hydrostatic Machine

[+] Author and Article Information
Noah D. Manring

Mechanical & Aerospace Engineering, University of Missouri—Columbia, Columbia, MO 65211

J. Dyn. Sys., Meas., Control 122(1), 216-221 (Oct 03, 1997) (6 pages) doi:10.1115/1.482445 History: Received October 03, 1997
Copyright © 2000 by ASME
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Manring,  N., and Johnson,  R., 1996, “Modeling and designing a variable-displacement open-loop pump,” ASME J. Dyn. Syst., Meas., Control, 118, pp. 267–271.
Schoenau,  G., Burton,  R., and Kavanagh,  G., 1990, “Dynamic Analysis of a Variable Displacement Pump,” ASME J. Dyn. Syst., Meas., Control, 112, pp. 122–132.
Kim,  S., Cho,  H., and Lee,  C., 1987, “A Parameter Sensitivity Analysis for the Dynamic Model of a Variable Displacement Axial Piston Pump,” Proceedings of the Institution of Mechanical Engineers, 201, pp. 235–243.
Zeiger,  G., and Akers,  A., 1985, “Torque on the Swashplate of an Axial Piston Pump,” ASME J. Dyn. Syst., Meas., Control, 107, pp. 220–26.
Pourmovahed,  A., 1992, “Uncertainty in the efficiencies of a hydrostatic pump/motor,” Proceedings of the Winter Annual Meeting of the American Society of Mechanical Engineers, Anaheim, CA.
Ezato, M., and Ikeya, M., 1986, “Sliding Friction Characteristics Between a Piston and a Cylinder for Starting and Low-Speed Conditions in the Swashplate-Type Axial Piston Motor,” 7th International Fluid Power Symposium, Bath, England.
McCandlish, D., and Dorey, R., 1981, “Steady-State Losses in Hydrostatic Pumps and Motors.” 6th International Fluid Power Symposium, St. Johns’s Colleges, Cambridge, England.


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General machine configuration
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Cylinder block free-body-diagram
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Piston-slipper assembly free-body-diagram
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Schematic of a piston-bore control volume
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A numerical pressure-profile for the nth piston exhibiting essentially no overshoot or undershoot in the transition regions
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A numerical pressure-profile for the nth piston exhibiting overshoot and undershoot in the transition regions
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Approximate pressure-profile. The magnitude of the discharge pressure is referenced from the magnitude of the intake pressure.
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A schematic of the pressure-profile on the cylinder block near the valve plate.



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