Experimental Study on Water Lubrication Characteristics of Full-Flat Thrust Bearing with Partial Water-Repellent Surface

• TAKEUCHI Akitoshi

  Kochi University of Technology School of System Engineering

• KITAMURA Yukio

  高知工科大学大学院工学研究科基盤工学専攻

Bibliographic Information

Other Title

• 部分撥水を施した平坦なスラスト軸受の水潤滑特性に関する実験的研究

Abstract

In this study, a flat thrust bearing is developed by active exploiting the slip flow generated on a water-repellent surface. In order to produce a load, this bearing has a structure that generates a pressure flow by using the discontinuity of shear flow rate between a water-repellent surface and an untreated or a hydrophilic surface. This structure results in the completely flat bearing that has no geometrical variations in its surface. Friction tests were carried out with respect to the water-repellent thrust bearing that consists of three water-repellent parts and untreated or hydrophilic parts. The results verified that this partial water-repellent thrust bearing functioned well with a low and stable friction coefficient (less than 0.002). And lubrication surfaces had no damages at all because both surfaces are separated with fluid film which enables to avoid the solid contact. The friction coefficient became lower for the bearing having large difference of contact angle (thus, shear flow rate) between both parts. Furthermore, a friction coefficient for the bearing of which water-repellent part and hydrophilic part had same area was the lowest, and friction coefficient became larger than its value in case of not only wide water-repellent part but also narrow one. These results suggest a possibility that this thrust bearing operates by the same mechanism as a conventional bearing under fluid lubrication.

Journal

• TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series C

  TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series C 77 (779), 2905-2915, 2011

  The Japan Society of Mechanical Engineers

Keywords

• Slip Flow
• Water-Repellent
• Thrust Bearing
• Water Lubrication
• Friction Reduction
• Glass

Details

• CRID: 1390282681363492864
• NII Article ID: 130001055330
• DOI: 10.1299/kikaic.77.2905
• ISSN: 18848354
• ISSN: 03875024
• Web Site: http://www.jstage.jst.go.jp/article/kikaic/77/779/77_779_2905/_pdf
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed