4.7 Article

Effect of surface texturing on elastohydrodynamically lubricated contact under transient speed conditions

Journal

TRIBOLOGY INTERNATIONAL
Volume 44, Issue 10, Pages 1144-1150

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.triboint.2011.05.005

Keywords

Elastohydrodynamic; Film thickness; Surface texturing; Transient speed conditions

Funding

  1. Czech Science Foundation [GA101/09/J034]
  2. Korean Government (GACR) [NRF-2009-220-D00013]

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Effect of surface topography modifications on lubrication film thickness within non-conformal lubricated contact operated under transient speed conditions is observed. Optical test rig is used to observe the lubricant film behaviour between the flat surface of a chromium coated glass disc and a steel ball under simplified operational conditions modelling the cam and tappet contact. Numerical simulation was used to be able to choose the operating conditions suitable for experiments. An array of micro-dents was produced on the ball surface to be able to demonstrate the effect of surface topography on lubrication film formation. Experiments were carried out under elastohydrodynamic lubrication conditions. Obtained results have shown that surface texturing could represent the way how to increase lubrication efficiency of rolling/sliding non-conformal contacts under transient operational conditions through the lubricant emitted from micro-dents. It was found that the lubricant emitted from the micro-dents helps to separate rubbing surfaces especially under thin film lubrication conditions where the rubbing surfaces moves in the opposite direction. (C) 2011 Elsevier Ltd. All rights reserved.

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