Performance improvement of an oil pump: Design of port assembled with gerotor (2-ellipses-combined lobe)

An internal gerotor pump is used to enhance the oil hydraulics of machine tools, automotive engines and compressor. In particular, this type of pump is used to supply lubricants in an automotive engine. Recently, improvements in automobile fuel efficiency and the reduction of noise have become critical issues. Thus, gerotor internal oil pumps have been studied for high flow rate and low noise through designs of multiple combined lobe shapes. In this study, in order to address the problems of existing oil pumps, design of a new lobe shape with 2-ellipses was developed in order to decrease a sharp change of curvature. Performance parameters of an improved gerotor (2-ellipses) were calculated and compared with those of the existing gerotor (circle and 3-ellipses). Also, we performed a computational fluid dynamics (CFD) analysis of an oil pump with the improved gerotor 2-ellipses-combined lobe shape. By using the commercial software ANSYS CFD, geometric parameters relating to the port shape, which affect the performance of flow rate and irregularity, were investigated. A re-design of the port shape was performed in order to improve fuel efficiency and reduce the noise of the oil pump.

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