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Research Papers

Influence of Gerotor Performance in Varied Geometrical Design Parameters

[+] Author and Article Information
Chiu-Fan Hsieh1

Department of Mechanical and Computer-Aided Engineering, National Formosa University, 64 Wunhua Road, Huwei, Yunlin, Taiwan 63208, R.O.C.cfhsieh@nfu.edu.tw

1

Corresponding author.

J. Mech. Des 131(12), 121008 (Nov 17, 2009) (7 pages) doi:10.1115/1.4000484 History: Received February 14, 2009; Revised September 05, 2009; Published November 17, 2009; Online November 17, 2009

Gerotor performance is influenced by sealing properties, area efficiency, contact stress, and outlet pressure. This paper uses the hypotrochoidal curve to generate the gerotor profile, and adopts the curvature difference method to assess the sealing property and predict the stress on the rotor profile. Numerical examples show that this method can successfully estimate and forecast the rotor sealing and the Hertz stress variation. For confirmation, these results are proved by theoretical stress calculations and software simulations. This paper also presents the results of sealing performance, stress variation, area efficiency, and outlet pressure for various geometrical design parameters. These results can serve as a pump performance reference, assisting designers wishing to create a better gerotor pump.

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Copyright © 2009 by American Society of Mechanical Engineers
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References

Figures

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Curvature difference analysis (R=5 mm)

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Influence area on gerotor profile

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Angle range quantity of influence area

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Stress analysis using the Hertz formula

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Contact length analysis

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Forecasted stress on the rotor profile: (a) μ=2, (b) μ=1.5, and (c) μ=1.1

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Stress simulation using FEM software: (a) μ=2, (b) μ=1.5, and (c) μ=1.1

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Area efficiency

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Hydraulic pressure model

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Outlet pressure

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Figure 1

Coordinate system

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Design results: (a) μ=2, (b) μ=1.5, and (c) μ=1.1

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