Research Papers

Pressure Compensator Design for a Swash Plate Axial Piston Pump

[+] Author and Article Information
N. P. Mandal

Assistant Professor
Department of Mechanical Engineering,
Heritage Institute of Technology,
Kolkata 700 107, India
e-mail: nimai_ju2001@yahoo.com

R. Saha

Assistant Professor
Department of Mechanical Engineering,
Jadavpur University,
Kolkata 700 032, India
e-mail: rsaha@mech.jdvu.ac.in

S. Mookherjee

Associate Professor
Department of Mechanical Engineering,
Jadavpur University,
Kolkata 700 032, India
e-mail: smookherjee@mech.jdvu.ac.in

D. Sanyal

Department of Mechanical Engineering,
Jadavpur University,
Kolkata 700 032, India
e-mail: dsanyal@mech.jdvu.ac.in

1Corresponding author.

Contributed by the Dynamic Systems Division of ASME for publication in the JOURNAL OF DYNAMIC SYSTEMS, MEASUREMENT, AND CONTROL. Manuscript received October 26, 2012; final manuscript received October 8, 2013; published online November 7, 2013. Assoc. Editor: Srinivasa M. Salapaka.

J. Dyn. Sys., Meas., Control 136(2), 021001 (Nov 07, 2013) (12 pages) Paper No: DS-12-1356; doi: 10.1115/1.4025672 History: Received October 26, 2012; Revised October 08, 2013

An in-line axial-piston swash-plate pump with pressure compensator is widely used for its fast speed of response and power economy. Although several simulation based design approaches exist to minimize issues like fluid-born noises, ample scope exists for more exhaustive design analysis. The most popular pressure compensator for a variable displacement pump with a spool valve actuating the control and bias cylinders has been taken up here. With an existing comprehensive flow dynamics model, an updated model for swiveling dynamics has been coupled. The dynamics also includes the force containment and friction effects on the swash plate. A design optimization has been accomplished for the pressure compensator. The target of the optimal design has been set as minimizing the transient oscillations of the swash plate, the compensator spool, pressures in the bias and control cylinders along with avoidance of both over-pressurization and cavitation in the bias cylinder. It has been found that the orifice diameters in the spring-side and at the metering port of the spool valve and in the backside of the bias cylinder have critical role in arriving at an optimum design. The study has led to a useful design procedure for a pressure compensated variable displacement pump.

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Fig. 1

Schematic of a awash-plate axial-piston pump

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Fig. 2

Schematic of the pressure-compensating spool valve

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Fig. 3

Complete free-body diagrams of the pistons

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Fig. 4

Free-body diagram of the swiveling dynamics of the swash plate

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Fig. 5

Geometric details of varying flow areas and delivery pressure

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Fig. 6

Variation of steady state swash angle, orifice area, load flow, and spool displacement

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Fig. 7

Swiveling dynamics of swash plate between extreme limits

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Fig. 8

Dynamics of bias piston chamber pressure during swiveling

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Fig. 9

Dynamics of control piston chamber pressure during swiveling

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Fig. 10

Dynamics of delivery manifold pressure during swiveling

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Fig. 11

Dynamics of spool displacement of compensator during swiveling




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