Abstract
Internal gerotor pumps has been used commercially in automatic transmissions, fuel pump engines, and compressors. As the automobile industry has required high fuel efficiency and reduction of noise, studies of internal gerotor profiles to obtain high flow rates and low irregularity have been conducted. But flow rate depends on volume of pumping chamber rather than geometric shape, therefore only design of lobe shape influences greatly on flow rate but has the limitation to a significant reduction of irregularity. On the contrary, flow of working oil is stable and smooth by design of port shape, so that it can help reduction of irregularity. In this study, the gerotor (2-ellipse), having a higher flow rate than the existing geroters, was chosen as the optimal design, and a design of the port shape was performed to decrease irregularity greatly through Computational fluid dynamics (CFD) analysis considering ten design parameters. The effect of each geometric parameter on irregularity was investigated through analysis of Signal-to-noise (S-N) ratios. Based on the results, an oil pump assembling the optimal gerotor (2-ellipse) with a new improved port shape was developed and has resulted in a significant reduction of irregularity, maintaining high flow rate.
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Recommended by Associate Editor Hyoung-gwon Choi
Hyoseo Kwak received M.S. degree in School of Creative Engineering and Ph.D. degree in Mechanical Convergence Technology, Pusan National University, Korea, in 2012, 2014 and 2017. She is currently in the post-doctoral course at Research Institute of Mechanical Technology, Pusan National University. Her research fields extend into machine design and FEM simulation (Structure, dynamic and fluid analysis).
Chul Kim received M.S. and Ph.D. degrees in 1987 and 1997. Professor Kim is currently a Professor in the Research Institute of Mechanical Technology at Pusan National University in Busan, Korea. His research fields extend into FEM simulation (Structure, dynamic and fluid analysis), optimal structural design, CAD/CAM.
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Kwak, H., Kim, C. Design of port shape for reducing irregularity of oil pump. J Mech Sci Technol 31, 5839–5848 (2017). https://doi.org/10.1007/s12206-017-1126-9
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DOI: https://doi.org/10.1007/s12206-017-1126-9