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Research Papers: Elastohydrodynamic Lubrication

Soft EHL Simulations of U-Cup and Step Hydraulic Rod Seals

[+] Author and Article Information
Bo Yang, Richard F. Salant

George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA 30332-0405

J. Tribol 131(2), 021501 (Mar 04, 2009) (10 pages) doi:10.1115/1.3063820 History: Received August 21, 2008; Revised November 23, 2008; Published March 04, 2009

A numerical soft elastohydrodynamic lubrication model of a reciprocating hydraulic seal has been used to simulate the performance of a U-cup seal and a step seal in a conventional actuator. The model consists of coupled steady state fluid mechanics, deformation mechanics, contact mechanics, and thermal analyses, with an iterative computational procedure. The results indicate that for a given seal roughness and stroke length there is a critical rod speed above which the seal will not leak. The critical speed is dependent on both seal roughness and sealed pressure.

Copyright © 2009 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Schematics of double lip U-cup and step seals

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Figure 2

Finite element analysis model—double lip U-cup seal

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Figure 3

Finite element analysis model—step seal

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Figure 5

Computational procedure

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Figure 6

Fluid transport/stroke versus rod speed, U-cup seal, 20.7 MPa, 0.3 μm roughness

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Figure 7

Fluid transport/stroke versus rod speed, step seal, 20.7 MPa, 0.3 μm roughness

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Figure 8

Net leakage/cycle versus rod speed, U-cup seal, 0.3 μm roughness

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Figure 9

Net leakage/cycle versus rod speed, step seal, 0.3 μm roughness

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Figure 10

Net leakage/cycle versus rod speed, U-cup seal, 20.7 MPa

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Figure 11

Net leakage/cycle versus rod speed, step seal, 20.7 MPa

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Figure 12

Critical rod speed versus seal roughness, U-cup seal

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Figure 13

Critical rod speed versus seal roughness, step seal

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Figure 14

Film thickness distributions, step seal, 20.7 MPa, 0.3 μm roughness

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Figure 15

Film thickness distributions, U-cup seal, 20.7 MPa, 0.3 μm roughness

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Figure 16

Pressure distributions, outstroke, step seal, 20.7 MPa, 0.3 μm roughness

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Figure 17

Pressure distributions, outstroke, U-cup seal, 20.7 MPa, 0.3 μm roughness

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Figure 18

Pressure distributions, instroke, step seal, 20.7 MPa, 0.3 μm roughness

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Figure 19

Pressure distributions, instroke, U-cup seal, 20.7 MPa, 0.3 μm roughness

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