Abstract
A gerotor pump is suitable for oil hydraulics of machine tools, automotive engines, compressors, constructions and other various applications. In particular the pump is an essential machine element that feeds lubricant oil in an automotive engine. The subject of this paper is the theoretical analysis of internal lobe pump whose the main components are the two rotors. Usually the outer one is characterized by lobes with a circular shape, while the inner rotor profile is determined as a conjugate to the other. For this reason the first topic presented here is the definition of the geometry of the rotors starting from the design parameters. The choice of these parameters is subject to some limitations in order to limit the pressure angle between the rotors. Now we will consider the design optimization. The first step is the determination of the instantaneous flow rate as a function of the design parameter. This allows us to calculate three performance indexes commonly used for the study of positive displacement pumps: the flow rate irregularity, the specific flow rate, and the specific slipping. These indexes are used to optimize the design of the pump and to obtain the sets of optimum design parameter. Results obtained from the analysis enable the designer and manufacturer of the oil pump to be more efficient in this field.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Beard, J. E., Hall, A. S. and Soedel, W., 1991, “Comparison of Hypotrochoidal and Epitrochoidal Gerotors,”ASME Journal of Mechanical Design, Vol. 113, pp. 133–141.
Choi, J. C., Kim Chul, Kim, J. H. and Kim, Y.M., 2002a, “Development of a system for progressive working of electric product by using Fuzzy Set Theory,”Internationaljournal Advanced Manufacturing Technology, Vol. 20, No. 10, pp. 765–779.
Choi, J. C., Kim Chul and Kim, J. H., 2002b, “A Study of the Progressive working of an Electric Product Using a 3D Shape Recognition Method,”International Journal Advanced Manufacturing Technology, Vol. 19, No. 7, pp. 525–536.
Colbourne, J. R., 1975, “Gear Shape and Theoretical Flow Rate in Inner Gear Pumps,”Transactions of the CSME, Vol. 3, No. 4, pp. 215–223.
Kim, J. H. and Kim Chul, 2006, “Development of an Integrated System for Automated Design of Gerotor Oil Pump,”KSPE, Vol. 23, No. 2, pp. 88–96.
Mimmi, G. and Pennacchi, P., 1997, “Inner Lobe Pump Design,”Transactioins of the CSME, Vol. 21, No. 2, pp. 109–121.
Saegusa, Y., Urashima, K., Sugimoto, M., Onoda, M. and Koiso, T., 0000, “Development of Oil-Pump Rotors with a Trochoidal Tooth Shape,”SAE Paper No. 840454.
Shim, J. Y., Kwak, J. S. and Song J. B., 2000, “Development of an Optimal Design Program for the Helical Gear on Vehicle Transmission,”Journal of the KSPE, Vol. 17, No. 11, pp. 88–93.
Tsay, C. B. and Yu, C. Y., 1989, “Mathematical Model for the Profile of Gerotor Pumps,”J. CSME, Vol. 10, No. 1, pp. 41–47.
Yu, C. Y. and Tsay, C. B., 1990, “The Mathematical Model of Gerotor Pump Applicable to Its Characteristic Study,”J. CSME, Vol. 11, No. 4, pp. 385–391.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Kim, J.H., Kim, C. & Chang, Y.J. Optimum design on lobe shapes of gerotor oil pump. J Mech Sci Technol 20, 1390–1398 (2006). https://doi.org/10.1007/BF02915962
Received:
Revised:
Issue Date:
DOI: https://doi.org/10.1007/BF02915962