1998 Fiscal Year Final Research Report Summary
Study on Elastohydrodynamic Lubrication of Undulatedly Roughened Elastomer Surfaces
| Project/Area Number |
09650174
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
設計工学・機械要素・トライボロジー
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| Research Institution | Kansai University |
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Principal Investigator |
MORI Atsunobu Kansai University, Faculty of Engineering, Professor, 工学部, 教授 (80026202)
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| Co-Investigator(Kenkyū-buntansha) |
OGATA Masanori Kansai University, Faculty of Engineering, Assistant, 工学部, 助手 (00098104)
TAGAWA Norio Kansai University, Faculty of Engineering, Professor, 工学部, 教授 (50298840)
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| Project Period (FY) |
1997 – 1998
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| Keywords | Lip-type Oil Seal / Elastomer / Elastic Contact / Elastohydrodynamic Lubrication / EHL / EHD |
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| Research Abstract |
Commercial lip-type oil seals were tested to observe micro-undulation developing on the elastomer lips in contact during run-in process. The micro-undulation was duplicated into a hard replica and its height and pitch were measured by means of scanning profilometry.
Following the measured profile, several types of model seals whose surface undulation was scaled up were prepared to demonstrate the elastohydrodynamic lubrication and sealing mechanisms between the lip and shaft surfaces. A hollow shaft made of glass was used to visualize the oil film creation. The film thickness was estimated by means of newly developed eccuipment based on the measurement of strength of the light reflected from the lip surface which is decaying through the oil film.
Numerical analyses were also carried out to simulate the oil film creation for sinusoidal undulation of realistic amplitade and wave length, in which the shaft surface was assumed rigid and smooth. The results showed that, for a stationaiy state without shaft rotation, the undulation of elastomer lip surface was easily flattened to ensure good sealing under usual contact pressure. For a shaft running at sufficient speed, the flattened lip surface recovered its undulation by 30-40 % accompanying the oil film creation. Those results of numerical simulation agreed with the behavior of commercial lip-type oil seals reported previously.
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Research Products
(6 results)
