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Technical Briefs

Teeth Clearance and Relief Grooves Effects in a Trochoidal-Gear Pump Using New Modules of GeroLAB

[+] Author and Article Information
P. J. Gamez-Montero1

LABSON, Department of Fluid Mechanics,  Universitat Politecnica de Catalunya, Colom 7, 08222 Terrassa, Spainpjgm@mf.upc.edu

M. Garcia-Vilchez

LABSON, Department of Fluid Mechanics,  Universitat Politecnica de Catalunya, Colom 7, 08222 Terrassa, Spainmercedes.garcia-vilchez@upc.edu

G. Raush

LABSON, Department of Fluid Mechanics,  Universitat Politecnica de Catalunya, Colom 1, 08222 Terrassa, Spaingustavo.raush@upc.edu

J. Freire

LABSON, Department of Mechanical Engineering,  Universitat Politecnica de Catalunya, Colom 7, 08222 Terrassa, Spainjavier.freire@upc.edu

E. Codina

LABSON, Department of Fluid Mechanics,  Universitat Politecnica de Catalunya, Colom 7, 08222 Terrassa, Spainecodina@mf.upc.edu

1

Corresponding author.

J. Mech. Des 134(5), 054502 (Apr 12, 2012) (7 pages) doi:10.1115/1.4006440 History: Received September 06, 2011; Revised March 06, 2012; Published April 11, 2012; Online April 12, 2012

As trochoidal-gear pump specifications become more demanding and design cycles shorter, the use of an innovative tool for modeling and simulation can be a cost effective and valuable guide to a more effective experimental work. The existing methodologies and software fail to thoroughly address the design by taking into account real effects to maximize efficiency and reduce flow fluctuation. Two new modules are added to the structured methodology of GeroLAB: minimum clearance module, teeth clearance related to leakage phenomenon, and relief groove effective port area module, modeling sharp rims with relief grooves in the porting plate which are related to flow performance. An analysis of the manufactured tolerance is conducted in four gear sets and results are compared and contrast. By using the bond graph model of a specific gerotor pump, flow performance is studied in nine cases with different relief grooves geometries and significant results are drawn. As a conclusion, these new modules aim to continue leading the designer to enhance the efficiency of a gerotor pump and the manufacturer to reduce costs by reducing time in experimental stage.

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Copyright © 2012 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Effective port area exposed to the chamber with sharp rim and with relief groove in the porting plate

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Figure 2

GeroLAB+  : new modules in GeroLAB package system

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Figure 3

Minimum clearance parameters in reference position (left) and input parameter window in minimum clearance module for PZ9e285 gear set (right)

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Figure 4

Graphic window of minimum clearance history for PZ9e285 gear set by using constant delayed contact angle (constant d.c.a) and variable delayed contact angle (variable d.c.a)

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Figure 5

Geometrical parameters of the relief groove effective port area (a), input parameter windows for geometrical parameters of the porting plate (b_left) and the outlet relief groove (b_right) in relief groove effective port area module for PZ9e285 gear set

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Figure 6

Graphic window of relief groove effective port area history in case 6 of Table 2 for PZ9e285 gear set

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Figure 7

Relative clearance history of studied gear sets

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Figure 8

Single chamber bond graph model with the new modulated components

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Figure 9

Relative effective port area from case 0 to case 4 with variation of the relief groove angle with a triangular shape

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Figure 10

Relative effective port area of case 5 to case 6 with variation of the no-centered position of a relief groove with a rectangular shape

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Figure 11

Relative effective port area of case 0, case 2 to case 9 with variation of shape, relief groove angle, and porting plate angle

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Figure 12

Instantaneous flow for specific studied cases for the PZ9e285 gear set using the bond graph model of the pump

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