Abstract
The gerotor pumps are the most important parts of mechanical equipment that have a vast number of applications in industries and automobiles. Because the gerotor pumps cannot be adjusted for wear so it is important to reduce the wear as much as possible. In this paper first mathematical equations for elliptical lobe shape rotors profile and curvature of them have been derived and then Specific flow and wear rate proportional factor (WRPF) have been formulated. To reach the minimum wear in rotors teeth, the ellipse shape factor is changed for each value of number of outer rotor teeth in a feasible range and wear rate proportional factor has been resulted. Also in order to have better comparison specific flow has been presented. The obtained results have been compared with circular pumps with similar geometrical parameters and show the significant improvement in wear of the rotors with negligible changes in the specific flow.
Similar content being viewed by others
References
Vecchiato D, Demenego A, Argyris J, Litvin F L. Geometry of a cycloidal pump. Computer Methods in Applied Mechanics and Engineering, 2001, 190(18–19): 2309–2330
Chen B K, Fang T T, Li C Y, Wang S Y. Gear geometry of cycloid drives. Science in China, Series E: Technology Sciences, 2008, 51(5): 598–610
Hwang Y W, Hsieh C F. Geometry design and analysis for Trochoidal type speed reducers with conjugate envelopes. Transactions of the Canadian Society for Mechanical Engineering, 2006, 30: 261–278
Hwang Y W, Hsieh C F. Determination of surface singularities of a cycloidal gear drive with inner meshing. Mathematical and Computer Modeling, 2007, 45(3–4): 340–354
Ivanović L, Josifović D. Specific sliding of trochoidal gearing profile in the gerotor pumps. FME Transactions, 2006, 34(3): 121–127
Chang Y J, Kim J H, Jeon C H, Kim C, Jung S Y. Development of an integrated system for the automated design of a gerotor oil pump. Journal of Mechanical Design, 2007, 129(10): 1099–1105
Kwon S M, Kim M S, Shin J H. Analytical wear model of a gerotor pump without hydrodynamic effect. Journal of Advanced Mechanical Design, Systems, and Manufacturing, 2008, 2: 230–237
Gamez-Montero P J, Castilla R, Mujal R, Khamashta M, Codina E. GEROLAB package system: innovative tool to design a trochoidalgear pump. Journal of Mechanical Design, 2009, 131(7): 074502
Demenego A, Vecchiato D, Litvin F L, Nervegna N, Manco S. Design and simulation of meshing of a cycloidal pump. Mechanism and Machine Theory, 2002, 37(3): 311–332
Gamez-Montero P J, Castilla R, Khamashta M, Codina E. Contact problems of a trochoidal-gear pump. International Journal of Mechanical Sciences, 2006, 48(12): 1471–1480
Kim J H, Kim C, Chang Y J. Optimum design on lobe shapes of gerotor oil pump. Journal of Mechanical Science Technology, 2006, 20(9): 1390–1398
Inaguma Y. Calculation of theoretical torque and displacement in an internal gear pump. Koyo Engineering Journal, 2006, 1001E: 70–76
Maiti R, Sinha G L. Kinematics of active contact in modified epitrochoid generated rotary piston machines. Mechanism and Machine Theory, 1988, 23(1): 39–45
Shung J B, Pennock G R. The direct contact problem in a trochoidaltype machine. Mechanism and Machine Theory, 1994, 29(5): 673–689
Beard J E, Yannitell D W, Pennock G R. The effects of the generating pin size and placement on the curvature and displacement of epitrochoidal gerotors. Mechanism and Machine Theory, 1992, 27(4): 373–389
Mimmi G C, Pennacchi P E. Involute gear pumps versus lobe pumps: A comparison. Journal of Mechanical Design, 1997, 119(4): 458–465
Mimmi G C, Pennacchi P E. Rotor design and optimization in internal lobe pumps. Applied Mechanics Reviews, 1997, 50(11): 133–141
Jung S Y, Han S M, Cho H Y, Kim C. Automated design system for a rotor with an ellipse lobe profile. Journal of Mechanical Science Technology, 2009, 23(11): 2928–2937
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Karamooz Ravari, M.R. Elliptical lobe shape gerotor pump design to minimize wear. Front. Mech. Eng. 6, 429–434 (2011). https://doi.org/10.1007/s11465-011-0247-6
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s11465-011-0247-6