Design of Gerotor Oil Pump with 2-Expanded Cardioids Lobe Shape for Noise Reduction

Sang Hyeop Lee, Hyo Seo Kwak, Gi Bin Han and Chul Kim
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Sang Hyeop Lee: Department of Mechanical Convergence Technology, Pusan National University, Busan 46241, Korea
Hyo Seo Kwak: Research Institute of Mechanical Technology, Pusan National University, Busan 46241, Korea
Gi Bin Han: School of Mechanical Engineering, Pusan National University, Busan 46241, Korea
Chul Kim: School of Mechanical Engineering, Pusan National University, Busan 46241, Korea

Energies, 2019, vol. 12, issue 6, 1-16

Abstract: Gerotor pump technology is being increasingly employed in innovative application fields, such as engines and as the hydraulic source of automatic transmissions. The most important issues in the automobile industry in recent years are improvement of fuel efficiency and noise reduction, so the existing studies relating to design of the gerotor profiles and the port in gerotor oil pumps have been conducted to ensure high flow rates and low irregularity. This study proposes a new gerotor lobe shape with 2-expanded cardioids to reduce the noise of the oil pump used in the automatic transmissions of automobiles. Theoretical equations to generate the tooth profile with 2-expanded cardioids was established, and then the gerotor profile to reduce noise was proposed using an automatic program. A design method for generation of a port shape suitable for the proposed gerotor was introduced, and performance tests (2000 rpm~3000 rpm) of the new oil pump with the suggested gerotor and port shape were implemented. The test results showed that the flow rate was improved by 7.3%~1.5% and the noise was reduced by 2.8 dB~4.8dB compared to those of the existing oil pump, so it was demonstrated that the design methods for the gerotor with 2-expanded cardioids and the port shape were validated. It is expected that the new lobe shape with 2-expanded cardioids and the port shape design method could be adopted in various fields, and will contribute to improving the performance of oil pumps.

Keywords: gerotor oil pump; 2-expanded cardioids lobe shape; performance test; flow rate; noise; sound pressure level (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
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