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RESEARCH PAPERS

Geometric Design for a Gerotor Pump With High Area Efficiency

[+] Author and Article Information
Chiu-Fan Hsieh

Department of Mechanical Engineering, National Chung-Cheng University, 168 San-Hsing, Ming-Hsiung, Chia-Yi 621, Taiwan, R.O.Cnaturaltom@gmail.com

Yii-Wen Hwang

Department of Mechanical Engineering, National Chung-Cheng University, 168 San-Hsing, Ming-Hsiung, Chia-Yi 621, Taiwan, R.O.Cimeywh@ccu.edu.tw

J. Mech. Des 129(12), 1269-1277 (Dec 10, 2006) (9 pages) doi:10.1115/1.2779887 History: Received April 24, 2006; Revised December 10, 2006

This paper proposes a gerotor profile design based on the theory of gearing. Presented first is the curve of the outer rotor, whose conjugate profile is the inner rotor. Next, the analysis assesses the feasibility of three different design curves: an epitrochoid curve, a hypotrochoidal curve, and a curve made by continuously connecting the epicycloid and hypocycloid. The undercutting equation derived from the mathematical model—which is presented in parametric form—facilitates identification of the design parameter limits, while the sealing property and nonundercutting on the profile are estimated using curvature analyses. Finally, the offset concept is applied to the gerotor design. First, two conjugate curves are obtained, whose offset curves are then found. Pump performance—including area efficiency and sealing—is also compared for these designs, which include both offset and nonoffset rotor profiles.

FIGURES IN THIS ARTICLE
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Copyright © 2007 by American Society of Mechanical Engineers
Topics: Design , Pumps , Rotors , Equations
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Figures

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Figure 1

Schematic of the cycloidal pump

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Figure 2

Design of the outer rotor profile

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Figure 3

Coordinate systems applied for the gerotor pump

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Figure 4

Curvature difference between outer and inner profiles

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Figure 5

Radius of curvature for outer profile

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Figure 6

Undercutting analysis for three examples

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Figure 7

Generation of gerotor profile

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Figure 8

Design constraint of tooth profile

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Figure 9

Gerotor designed with hypotrochoidal curve and their offset profiles

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Figure 10

Tooth profile analysis by the radius of curvature

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Figure 11

Definition of span angle as θspan(outer)

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Figure 12

Comparison of the area efficiency under nonundercutting

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Figure 13

Design results of gerotor

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Figure 14

Area efficiency of offset rotors

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