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Optimal design of the gerotor (2-ellipses) for reducing maximum contact stress

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Abstract

The oil pump, which is used as lubricator of engines and auto transmission, supplies working oil to the rotating elements to prevent wear. The gerotor pump is used widely in the automobile industry. When wear occurs due to contact between an inner rotor and an outer rotor, the efficiency of the gerotor pump decreases rapidly, and elastic deformation from the contacts also causes vibration and noise. This paper reports the optimal design of a gerotor with a 2-ellipses combined lobe shape that reduces the maximum contact stress. An automatic program was developed to calculate Hertzian contact stress of the gerotor using the Matlab and the effect of the design parameter on the maximum contact stress was analyzed. In addition, the method of theoretical analysis for obtaining the contact stress was verified by performing the fluid-structural coupled analysis using the commercial software, Ansys, considering both the driving force of the inner rotor and the fluid pressure, which is generated by working oil.

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Author information

Authors and Affiliations

  1. Department of Mechanical Convergence Technology, Pusan National University, Busan, Korea

    Hyo Seo Kwak & Sheng Huan Li

  2. School of Mechanical Design & Manufacturing, Busan Institute of Science and Technology, Busan, Korea

    Chul Kim

Authors
  1. Hyo Seo Kwak
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  2. Sheng Huan Li
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  3. Chul Kim
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Corresponding author

Correspondence to Chul Kim.

Additional information

Recommended by Associate Editor Beomkeun Kim

Hyoseo Kwak received her B.S. degree in Mechanical Engineering in 2012, and her M.S. degree in Creative Engineering Systems in 2014 from Pusan National University, Korea. She is currently in the doctoral course in the same area as the M.S. Her research fields extend into FEM simulations and gerotor design (structure, dynamic and fluid analysis).

Shenghuan Li received his B.S. degree in Management Information System in 2013 from Yanbian University Science and Technology, China. He is currently in the master course in Creative Engineering Systems from Pusan National University, Korea. His research fields extend into the design of gerotor’s shape profile.

Chul Kim received his B.S. degree in Mechanical Engineering from Pusan National University, Korea, in 1985. He received his 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 simulations (structure, dynamic and fluid analysis), optimal structural design, and CAD/CAM.

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Kwak, H.S., Li, S.H. & Kim, C. Optimal design of the gerotor (2-ellipses) for reducing maximum contact stress. J Mech Sci Technol 30, 5595–5603 (2016). https://doi.org/10.1007/s12206-016-1128-z

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  • DOI: https://doi.org/10.1007/s12206-016-1128-z

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