Design and simulation of meshing of a particular internal rotary pump

Bonandrini, Giovanni; Mimmi, Giovanni; Rottenbacher, Carlo Eugenio Alessandro

doi:10.1016/j.mechmachtheory.2011.11.001

Cited by 25 publications

(13 citation statements)

References 13 publications

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“…Figure 7 shows four different designs of inner -outer rotors pairs of gerotor pumps. While the design geometry and related topics of gerotor pumps is addressed by the literature on a large scale, with references [16][17][18] representing just a related sample, at the same time nothing has been published regarding their particular manufacturing issues, leaving them to be dealt by the general CAD/CAM systems. However, the main part of them, the inner rotor, could be manufactured with the simplicity and accuracy offered by a dedicated for the case interpolation algorithm based on the structure presented in Section 3.…”

Section: Machining Of An Inner Rotor Of a Gerotor Pumpmentioning

confidence: 99%

A CNC Manufacturing Method for Parts with Trochoidal Profile

Omirou

Fyrillas

2014

Journal for Manufacturing Science and Production

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This paper presents a manufacturing method for parts with trochoidal profile on CNC milling machines. The method is based on a new real-time interpolation algorithm capable to drive the cutter along the offset of trochoid curves with precision equal to the resolution of the machine. The structure of the presented algorithm may be adapted accordingly so as to be used either for parts with an epitrochoidal or a hypotrochoidal profile. Both types of curves, known as trochoid curves, have important industrial applications such as gears with trochoidal tooth-profile, cams, trochoidal-shaped housings for rotary internal combustion engines and rotary piston pumps etc. The effectiveness and accuracy of the proposed method is verified by simulation tests of the generated tool path for the machining of two representative mechanical parts, an inner rotor of a hypogerotor pump and an epitrochoidal-shaped housing.

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Section: Machining Of An Inner Rotor Of a Gerotor Pumpmentioning

confidence: 99%

A CNC Manufacturing Method for Parts with Trochoidal Profile

Omirou

Fyrillas

2014

Journal for Manufacturing Science and Production

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“…The dependence of the pump performances over the rotors geometry was first addressed by Hsieh [18][19][20]. Several lobe geometries, such as elliptic, sinusoidal, poly-circular, and parabolic, have been studied by Mancò [1] and Mimmi [21], while Bonandrini [22,23] and Demenego [24] focused on research for novel rotor profiles, to limit the wear rate. To achieve similar objectives, Hsieh recently published an original solution that makes use of variable clearance designs [25].…”

Section: Introductionmentioning

confidence: 99%

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

2019

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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.

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“…Previous studies on gerotor lobe shape design mostly focused only on the trochoid curves (cycloid, epitrochoid and hypotrochoid), which have been used in a broad array of applications [2][3][4][5]. Mimmi presented a method for avoiding undercutting of cycloid pumps and determined the analytical expression of the limit curve [2].…”

Section: Introductionmentioning

confidence: 99%

“…Ravari implemented the optimization of an epitrochoidal gerotor according to volumetric, dynamic and geometric properties, and the results showed wear rates proportional to factor and the irregularity were significantly improved [4]. Bonandrini studied an epitrochoidal profile for internal rotary pumps to have superior flow-rate performance, and a tooth contact analysis was performed to consider possible transmission errors [5]. Om et al presented a method to design the cross section of PCPs or DHMs with hypotrochoidal multilobes by using the differential geometric approach and established the formulae for the envelope and its offset curve and calculated the area efficiency of the cross section and curvature of the hypotrochoid [6], but they did not conduct a design of a new type of gerotor profile to improve the performance of oil pumps, considering design parameters relating to lobe shape.…”

Section: Introductionmentioning

confidence: 99%

Design of Gerotor Oil Pump with 2-Expanded Cardioids Lobe Shape for Noise Reduction

et al. 2019

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Gerotor pump technology is being increasingly employed in innovative application fields, such as engines and as the hydraulic source of automatic transmissions. The most important issues in the automobile industry in recent years are improvement of fuel efficiency and noise reduction, so the existing studies relating to design of the gerotor profiles and the port in gerotor oil pumps have been conducted to ensure high flow rates and low irregularity. This study proposes a new gerotor lobe shape with 2-expanded cardioids to reduce the noise of the oil pump used in the automatic transmissions of automobiles. Theoretical equations to generate the tooth profile with 2-expanded cardioids was established, and then the gerotor profile to reduce noise was proposed using an automatic program. A design method for generation of a port shape suitable for the proposed gerotor was introduced, and performance tests (2000 rpm~3000 rpm) of the new oil pump with the suggested gerotor and port shape were implemented. The test results showed that the flow rate was improved by 7.3%~1.5% and the noise was reduced by 2.8 dB~4.8dB compared to those of the existing oil pump, so it was demonstrated that the design methods for the gerotor with 2-expanded cardioids and the port shape were validated. It is expected that the new lobe shape with 2-expanded cardioids and the port shape design method could be adopted in various fields, and will contribute to improving the performance of oil pumps.

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Design and simulation of meshing of a particular internal rotary pump

Cited by 25 publications

References 13 publications

A CNC Manufacturing Method for Parts with Trochoidal Profile

A CNC Manufacturing Method for Parts with Trochoidal Profile

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

Design of Gerotor Oil Pump with 2-Expanded Cardioids Lobe Shape for Noise Reduction

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