부산대학교 도서관

The gerotor oil pump is advantageous for miniaturization as it can deliver a higher output per rotation compared to pumps of the same size and finds wide application in hydraulic systems such as engine lubrication and automatic transmission systems due to its low noise and superior suction performance. It was observed that increasing the chamber width leads to better pulsation and noise performance. High pressure pulsation is a significant factor in vibration and noise generation in oil pumps, particularly crucial for electric vehicles where quietness is emphasized. A previously developed profile was not used in electric vehicles due to this problem. To compensate for this problem, the characteristics of flow and noise according to the area of the chamber were found, and the rotor was designed and analyzed to minimize the pressure pulsation and noise level by applying this. The internal and external rotors were designed based on the ovoid parameter equations, incorporating rotation, translational motion, and expansion algorithms. The designed profile was applied to a GUI and an automatic performance factor calculation program in MATLAB to derive the optimal profile with the best performance. To test the performance of the developed profile, computational fluid dynamics (CFD) using the dynamic mesh technique and experiment was conducted. These design techniques can be used to create and test various gerotor profiles that meet various design requirements, and to develop a pump with improved performance, reduced noise, and improved efficiency while satisfying various design requirements and maintaining miniaturization and reliability.