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.
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December 2007
Research Papers
Geometric Design for a Gerotor Pump With High Area Efficiency
Chiu-Fan Hsieh,
Chiu-Fan Hsieh
Department of Mechanical Engineering,
e-mail: naturaltom@gmail.com
National Chung-Cheng University
, 168 San-Hsing, Ming-Hsiung, Chia-Yi 621, Taiwan, R.O.C
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Yii-Wen Hwang
Yii-Wen Hwang
Department of Mechanical Engineering,
e-mail: imeywh@ccu.edu.tw
National Chung-Cheng University
, 168 San-Hsing, Ming-Hsiung, Chia-Yi 621, Taiwan, R.O.C
Search for other works by this author on:
Chiu-Fan Hsieh
Department of Mechanical Engineering,
National Chung-Cheng University
, 168 San-Hsing, Ming-Hsiung, Chia-Yi 621, Taiwan, R.O.Ce-mail: naturaltom@gmail.com
Yii-Wen Hwang
Department of Mechanical Engineering,
National Chung-Cheng University
, 168 San-Hsing, Ming-Hsiung, Chia-Yi 621, Taiwan, R.O.Ce-mail: imeywh@ccu.edu.tw
J. Mech. Des. Dec 2007, 129(12): 1269-1277 (9 pages)
Published Online: December 10, 2006
Article history
Received:
April 24, 2006
Revised:
December 10, 2006
Citation
Hsieh, C., and Hwang, Y. (December 10, 2006). "Geometric Design for a Gerotor Pump With High Area Efficiency." ASME. J. Mech. Des. December 2007; 129(12): 1269–1277. https://doi.org/10.1115/1.2779887
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