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http://dx.doi.org/10.7736/KSPE.2016.33.3.207

Performance Improvement of Oil Pump by Design of Gerotor (Combined Profile - Two Ellipses) and Port  

Kwak, Hyo Seo (Department of Creative Engineering, Pusan National University)
Li, Sheng Huan (Department of Creative Engineering, Pusan National University)
Kim, Chul (Research Institute of Mechanical Technology, Pusan National University)
Publication Information
Journal of the Korean Society for Precision Engineering / v.33, no.3, 2016 , pp. 207-216 More about this Journal
Abstract
A gerotor is suitable for miniature manufacturing because it has high discharge per 1 cycle and a simple structure, while also being widely used for lubrication oil of engines and as a hydraulic source of automatic transmission. In the automobile industry, improvements in fuel efficiency and noise reduction have recently come to the fore. It has also been necessary to continuously improve the flow rate and noise of internal gear pumps for better fuel efficiency through optimal gerotor and port shape design. In this study, to develop an optimal gerotor with a new lobe shape, 2-ellipses-combined, the equation of the lobe shape was derived, and CFD analysis results were compared for 2-ellipses with those of the previous gerotors (3-ellipses and ellipse1-involuteellipse2). A performance test for the oil pump with the optimal rotor (2-ellipses) was carried out and showed good agreement with the results obtained from CFD analysis.
Keywords
Gerotor; Combined profile; 2-Ellipse; Computational fluid analysis; Performance test;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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1 Colbourne, J., "Gear Shape and Theoretical Flow Rate in Internal Gear Pumps," Canadian Society for Mechanical Engineering, Transactions, Vol. 3, No. 4, pp. 215-223, 1975.   DOI
2 Saegusa, Y., Urashima, K., Sugimoto, M., Onoda, M., and Koiso, T., "Development of Oil-Pump Rotors with a Trochoidal Tooth Shape," SAE Technical Paper, 1984.
3 Beard, J. E., Pennock, G. R., and Stanisic, M. M., "The Effects of the Design Parameters on the Generated Curvature and Displacement of Epitrochoidal Gerotor Pumps," SAE Technical Paper, 1989.
4 Fabiani, M., Mancò, S., Nervegna, N., Rundo, M., Armenio, G., et al., "Modelling and Simulation of Gerotor Gearing in Lubricating Oil Pumps," SAE Technical Paper, 1999.
5 Mimmi, G. C. and Pennacchi, P. E., "Non-Undercutting Conditions in Internal Gears," Mechanism and Machine Theory, Vol. 35, No. 4, pp. 477-490, 2000.   DOI
6 Demenego, A., Vecchiato, D., Litvin, F. L., Nervegna, N., and Manco, S., "Design and Simulation of Meshing of a Cycloidal Pump," Mechanism and Machine Theory, Vol. 37, No. 3, pp. 311-332, 2002.   DOI
7 Lee, S.-C., "Profile Design of the Inner Rotor of a Gerotor by the Composite Curve of Circular Arcs," Journal of the Korean Society of Tribologists and Lubrication Engineers, Vol. 22, No. 2, pp. 79-86, 2006.
8 Ye, Z., Zhang, W., Huang, Q., and Chen, C., "Simple Explicit Formulae for Calculating Limit Dimensions to Avoid Undercutting in the Rotor of a Cycloid Rotor Pump," Mechanism and Machine Theory, Vol. 41, No. 4, pp. 405-414, 2006.   DOI
9 Chang, Y., Kim, J., Jeon, C., Kim, C., and Jung, S., "Development of an Integrated System for the Automated Design of a Gerotor Oil Pump," Journal of Mechanical Design, Vol. 129, No. 10, pp. 1099-1105, 2007.   DOI
10 Hsieh, C.-F. and Hwang, Y.-W., "Geometric Design for a Gerotor Pump with High Area Efficiency," Journal of Mechanical Design, Vol. 129, No. 12, pp. 1269-1277, 2007.   DOI
11 Sasaki, H., Inui, N., Shimada, Y., and Ogata, D., "Development of High Efficiency P/M Internal Gear Pump Rotor(Megafloid Rotor)," Automotive SEI Technical Review, No. 66, pp.124-128, 2008.
12 Choi, T.-H., Kim, M.-S., Lee, G.-S., Jung, S.-Y., and Kim, C., "Design of Gerotor Using Cycloid and Circular-Arc Curves," Transactions of the Korean Society of Mechanical Engineers: A, Vol. 35, No. 3, pp. 241-250, 2011.   DOI
13 Jung, S.-Y., Kim, M.-S., and Kim, C., "Development of a New Gerotor for Oil Pumps with Multiple Profiles (Ellipse1, Involute and Ellipse2)," J. Korean Soc. Precis. Eng., Vol. 28, No. 5, pp. 614-622, 2011.
14 Bae, J. H., Kwak, H. S., San, S., and Kim, C., "Design and CFD Analysis of Gerotor with Multiple Profiles (Ellipse-Involute-Ellipse Type and 3-Ellipses Type) Using Rotation and Translation Algorithm," Proc. of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, DOI No. 10.1177/0954406215583888, 2015.   DOI
15 Bae, J., Bae, W., Joo, U., and Kim, C., "Optimal Design of Rotor Profile of Internal Gear Pump for Noise Reduction," Transaction of the Korean Society of Mechanical Engineers: A, Vol. 38, No. 3, pp. 295-302, 2014.   DOI
16 Mimmi, G. and Pennacchi, P., "Internal Lobe Pump Design," Transactions of the Canadian Society for Mechanical Engineering, Vol. 21, No. 2, pp. 109-121, 1997.   DOI