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Research Papers: Hydrodynamic Lubrication

The Effect of Wear on the Performance of a Rotary Lip Seal

[+] Author and Article Information
Fei Guo

State Key Laboratory of Tribology,
Tsinghua University,
Beijing 100084, China
e-mail: guof10@mails.tsinghua.edu.cn

Xiaohong Jia

State Key Laboratory of Tribology,
Tsinghua University,
Beijing 100084, China
e-mail: jiaxh@mail.tsinghua.edu.cn

Wang Longke

Eaton Corporation,
Eden Prairie, MN 55344
e-mail: longke.wang@gmail.com

Richard F. Salant

Georgia Institute of Technology,
Atlanta, GA 30332
e-mail: richard.salant@me.gatech.edu

Yuming Wang

State Key Laboratory of Tribology,
Tsinghua University,
Beijing 100084, China
e-mail:yumingwang@tsinghua.edu.cn

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received February 9, 2014; final manuscript received May 1, 2014; published online June 6, 2014. Assoc. Editor: George K. Nikas.

J. Tribol 136(4), 041703 (Jun 06, 2014) (8 pages) Paper No: TRIB-14-1039; doi: 10.1115/1.4027623 History: Received February 09, 2014; Revised May 01, 2014

Theoretical analysis, combined with experimental verification, is used to study the effect of wear on the performance of a rotary lip seal as characterized by the pumping rate and friction torque. The performance of a rotary lip seal is determined by the sealing lip surface microscopic characteristics and contact characteristics at the sealing zone. The variation of the contact characteristics with wear has been established based on the variation of the sealing lip profiles measured by using a trilinear coordinate measuring instrument. The impression method is used to copy the lip surface microtopography at different wear times and then an optical interferometer is used to measure the impression surface microtopography to obtain the variation of roughness with wear. The variations of the roughness, contact characteristics, and approximate contact temperature with wear are inserted into a mixed lubrication model to obtain the variations of the pumping rate and friction torque. A comparison of the simulated results with those from experimental measurement verifies the validity of the theoretical analysis.

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References

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Figures

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Fig. 1

Schematic of the lip seal

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Fig. 2

Schematic of the bench test rig

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Fig. 3

Schematic of the sealing lip profile measurement

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Fig. 4

Schematic of the contact width measurement

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Fig. 5

Schematic of the radial force test apparatus

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Fig. 6

Physical picture of the impression method

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Fig. 7

Computational procedure

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Fig. 8

Sealing lip profiles versus wear time

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Fig. 9

Static contact pressure distributions versus wear time

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Fig. 10

Calibration and measurement of the contact width

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Fig. 11

Contact width versus wear time

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Fig. 12

Radial force versus wear time

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Fig. 13

Surface map measurements of the polyurethane impression

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Fig. 14

Measurements of the polyurethane impression and lip seal itself: (a) 2D surface profile of the polyurethane impression and (b) 2D surface profile of the lip seal itself

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Fig. 15

RMS roughness versus wear time

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Fig. 16

Contact temperature versus wear time

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Fig. 17

Pumping rate versus wear time

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Fig. 18

Friction torque versus wear time

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