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Optimization of Gerotor Pumps with Asymmetric Profiles through an Evolutionary Strategy Algorithm

Department of Mechanical and Aerospace Engineering, Politecnico di Torino, 10129 Torino, Italy
Author to whom correspondence should be addressed.
Machines 2019, 7(1), 17;
Received: 29 January 2019 / Revised: 20 February 2019 / Accepted: 22 February 2019 / Published: 1 March 2019
PDF [6507 KB, uploaded 1 March 2019]


Gerotor pumps are widely used for fuel and lubricating oil distribution, since they provide an economic and compact solution for low-pressure fluid systems. Made of two internally coupled gears, their behavioral and operative performances are strictly tied to their geometrical designs. Traditionally, the external gear features circular lobes that give origin to a cycloidal profile for the internal rotor. In this paper, the use of profiles based on asymmetric lobes made of elliptic arcs is further explored and expanded. At first, a complete mathematical framework describing the pump geometry and its dynamic behavior is provided, while algorithms used to compute a selected number of performance indexes are presented and when possible, verified. Hence, a single-objective optimization procedure is applied to the traditional cycloidal profile, in order to minimize each of the following quantities: the flow rate irregularity, the expected wear rate, and the estimated rotor mass. Finally, a multi-objective optimization process based on evolutionary strategy is employed, to obtain several asymmetric profiles minimizing the combination of two or more performance indexes. The results are hence compared, and the merits associated with the use of asymmetric lobes are presented. View Full-Text
Keywords: gerotor pumps; pumps design; asymmetric profiles; design optimization gerotor pumps; pumps design; asymmetric profiles; design optimization

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

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