Improving Gerotor Pump Performance Trough Design, Modeling and Simulation


  • Lozica Ivanović University of Kragujevac, Faculty of Engineering, 34000 Kragujevac, Serbia
  • Miloš Matejić University of Kragujevac, Faculty of Engineering, 34000 Kragujevac, Serbia



Trochoidal gearing;, gerotor pump;, volumetric flow rate;, contact stress, wear rate proportional factor


Gerotor pumps are well known by a compact design, simple structure and low noise level, which makes them suitable for use in the automotive industry, and especially in hydraulic systems for engine lubrication. One of the main disadvantages of gerotor pumps is the inability to adjust to wear, which significantly reduces the pump efficiency. In order to mitigate the negative effect of the inevitable wear process, this paper presents a methodology for determining the optimal combination of trochoid gears design parameters for a defined aspect. An appropriate mathematical model has been developed to analyze the effect of changes in gear design parameters in relation to maximum contact stresses, pressure changes in gerotor pump chambers and wear rate proportional factor (WRPF). Verification of the developed models was performed by realizing physical pairs of gears and laboratory experiments with simulation of pump operating conditions. The results and conclusions presented in this paper, with an emphasis on the actual work processes, bring very important perspectives for the gerotor pumps design with improved performance.


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Author Biographies

Lozica Ivanović, University of Kragujevac, Faculty of Engineering, 34000 Kragujevac, Serbia

Lozica Ivanović is a professor at the University of Kragujevac, Faculty of Engineering, Serbia. She received her Ph.D. in mechanical engineering from University of Kragujevac in 2007. Her research interests includes: mechanical design, generating special tooth profile applied in mechanical construction, especially trochoidal profile, analysis and design of gerotor pump, industrial design. She is Editor of journal Applied Engineering Letters.

Miloš Matejić, University of Kragujevac, Faculty of Engineering, 34000 Kragujevac, Serbia

Miloš Matejić is an assistant professor at the University of Kragujevac, Faculty of Engineering , Serbia. He received his Ph.D. in mechanical engineering from University of Kragujevac in 2019. His research interests includes: machine elements, power transmission, CAD and expert systems in machine design. He is reviewer in one journal publishing by Springer, and one journal publishing by Elsevir.


Nang, A., Maiti, R.: Unification of epitrochoid origin profile design approaches for external lobed star member used in hydrostatic and gear units. Journal Mechanical Science 227(2), 299–310 (2012).

Gamez-Montero, P. J., Castilla, R., Codina, E.: A Review of Gerotor Technology in Hydraulic Machines. Energies 12, 2423 (2019).

Maiti, R., Sinha, G. L.: Kinematics of active contact in modified epitrochoid generated rotary piston machines. Mech Mach Theory 23, 39–45 (1988).

Gamez-Montero, P. J., Castilla, R., Codina, E.: Methodology based on best practice rules to design a new-born trochoidal gear pump. Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 232(6), 1057–1068 (2018).

Ivanovic, L. Josifovic, D.: Specific Sliding of Trochoidal Gearing Profile in the Gerotor Pumps. FME Transactions (34), 121–127 (2006).

Stryczek, J., Bednarczyk, S., Biernacki, K.: Gerotor pump with POM gears: Design, production technology, research. Archives of Civil and Mechanical Engineering, 14(3), 391–397 (2014).

Beard, J. E., Yannitell, W., Pennock, G. R.: The effects of the generating pin size and placement on the curvature and displacement of Epitrochoidal Gerotors. Mech Mach Theory 27, 373–389 (1992).

Stryczek, J., Banaś, M., Krawczyk, J., Marciniak, L., Stryczek, P.: The fluid power elements and systems made of plastics. Procedia Engineering, Elsevier 176, 600-609 (2017).

Gamez-Montero, P. J., Antoniak, P., Castilla, R., Freire, J., Krawczyk, J., Stryczek, J., Codina, E.: Magnet-Sleeve-Sealed Mini Trochoidal-Gear Pump Prototype with Polymer Composite Gear. Energies (10), 1458 (2017).

Gamez-Montero, P. J., Garcia-Vilchez, M., Raush, G., Freire, J., Codina, E.: Teeth clearance and relief grooves effects in a trochoidal-gear pump using new modules of GeroLAB. Journal of Mechanical Design, Transactions of the ASME 134(5), (2012).

Hsieh, C.F.: Flow Characteristics of Gerotor Pumps with Novel Variable Clearance Designs. Journal of fluids engineering-Transactions of the ASME 137(4), 041107 (2015).

Pellegri, M., Vacca, A.: Numerical simulation of Gerotor pumps considering rotor micro-motions. Meccanica 52(8), 1851–1870 (2017).

De Martin, A., Jacazio, G., Sorli, M.: Optimization of Gerotor Pumps with Asymmetric Profiles through an Evolutionary Strategy Algorithm, Machines 7(1), 17 (2019).

Kwon, S. M., Kim, M. S., Shin, J. H.: Analytical wear model of a gerotor pump without hydrodynamic effect. J Adv Mech Des Syst 2, 230–237 (2008).

Karamooz Ravari, M. R., Forouzan, M.R., Moosavi, H.: Flow irregularity and wear optimization in epitrochoidal gerotor pumps. Meccanica 47, 917–928 (2012) doi: 10.1007/s11012-011-9473-6

Ivanovic, L.: Reduction of the maximum contact stresses by changing geometric parameters of the trochoidal gearing teeth profile. Meccanica 51(9), 2243–2257 (2016).

Ivanović, L., Devedžić G., Mirić N., Ćukovic S.: Analysis of forces and moments in the gerotor pumps. Proceedings of the Institution of Mechanical Engineers. Part C: Journal of Mechanical Engineering Science 1(1), 1–13 (2010).

Ivanović, L. (2021) Design, Modeling and Simulation of Gearing for Improving Gerotor Pump Performance. In: Stryczek J., Warzyńska U. (eds) Advances in Hydraulic and Pneumatic Drives and Control 2020. NSHP 2020. Lecture Notes in Mechanical Engineering. Springer, Cham.

Maiti, R.: Active contact stresses at epitrochoid generated rotor-stator set of fixed axis or equivalent system ROPIMA type hydrostatic units. Journal of Engineering for Industry 113, 465–473 (1991).

Ivanovic, L., Devedzic, G., Cukovic,S., Miric, N.: Modeling of the Meshing of Trochoidal Profiles with Clearances. Journal of Mechanical Design 134(4), 041003-1/041003-9 (2012).

Rundo, M.: Models for Flow Rate Simulation in Gear Pumps: A Review. Energies 10, 1261 (2017).