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RESEARCH PAPERS

Optimization of the Cross Section of an Elastomeric Seal for Pneumatic Cylinders

[+] Author and Article Information
Guido Belforte

 Politecnico di Torino, Department of Mechanics, Corso Duca degli Abruzzi n. 24, 10129-Torino, Italy

Andrea Manuello

 University of Cagliari, Department of Mechanical Engineering, Piazza d’Armi, Cagliari, Italy

Luigi Mazza

 Politecnico di Torino, Department of Mechanics, Corso Duca degli Abruzzi n. 24, 10129-Torino Italy

J. Tribol 128(2), 406-413 (Sep 29, 2005) (8 pages) doi:10.1115/1.2162915 History: Received June 06, 2005; Revised September 29, 2005

The cross section of an elastomer seal for pneumatic actuator pistons was optimized to minimize the friction force exchanged with the cylinder bore. The new seal geometry was developed using a finite element numerical model which takes material nonlinearities and frictional contact with seat and cylinder bore surfaces into account. The friction force exchanged between the new seal and the pneumatic cylinder bore was measured experimentally using a suitable sensorized test bench.

Copyright © 2006 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Cross section of the existing lobed seal (dimensions in millimeter)

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Figure 2

Friction coefficient test bench

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Figure 3

Sample of analysis plot: load condition A+B(pF=0.6MPa)

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Figure 4

Contact pressure at the seal-cylinder bore interface (loading condition A+B, pF=0.6MPa)

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Figure 5

Sample of seal-deformed geometries during piston-seat redesigning: (a) seat with shoulder featuring inclined parallel planes, (b) seat with shoulder featuring inclined planes and convex bottom, and (c) seat with inclined shoulder and convex bottom

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Figure 6

Contact pressure during piston-seat redesigning (loading condition A+B)

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Figure 7

Optimized seat geometry

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Figure 8

Deformed seal cross section in optimized piston seat, loading condition A+B(pF=0.6MPa)

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Figure 9

Contact pressure with lobed seal installed in original and redesigned seats

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Figure 10

First tentative seal cross section (geometrically symmetric with optimized seat)

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Figure 11

Hypothesis of the new seal section behavior under load

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Figure 12

The new seal geometry optimization: contact pressure and normal force versus seal dimensions L1 and L4

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Figure 13

Deformed cross section and von Mises stress (MPa) of the egg-shaped seal geometry

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Figure 14

Contact pressures for the different seal geometries

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Figure 15

Friction force test bench

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Figure 16

Section through the piston used for friction force measurements

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Figure 17

Experimental results for the lobed seal in the nominal piston seat (grease lubrication)

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Figure 18

Experimental results for the lobed seal in the optimized piston seat (grease lubrication)

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Figure 19

Experimental results for the egg-shaped seal configuration (grease lubrication)

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Figure 20

Experimental comparison between the original lobed seal and the egg-shaped seal (grease lubrication)

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