Transient EHD lubrication, where operating parameters such as speed, load and surface curvature vary over time, occurs in many machine elements such as cams, gears or roller bearings. The effect of transient speed and surface texturing on EHD lubrication films are investigated by the direct observation. For the purposes of the experiment the speed profile of contact point between cam and follower is used. Most critical part of the operation is when the contact surfaces are running in opposite directions. This effect can cause a lubricant film breakdown and in consequence also damage of contact surfaces. For this reason three types of experiments, for the same speed profile, are carried out for polished surface and for contact surfaces with and without surface texturing. It has enabled us to consider if the texture of micro-dents have any significant influence on film thickness especially in critical parts of the operation. To simplify the problem the concept of cam and follower contact was replaced by EHD contact of the flat surface of chromium coated glass disk and a steel ball. Also only transient speed was taken into account. The method used to measured film thickness was thin film colorimetric interferometry. The experimental results show that micro-dents could increase lubrication efficiency under rolling/sliding condition through the lubricant emitted from micro-dents. It was found that the lubricant emitted from micro-dents helps to separate contact surfaces especially in the case where the contact surfaces moves very slowly in the opposite direction.
Skip Nav Destination
ASME/STLE 2011 International Joint Tribology Conference
October 24–26, 2011
Los Angeles, California, USA
Conference Sponsors:
- Tribology Division
ISBN:
978-0-7918-5474-7
PROCEEDINGS PAPER
Effect of Surface Texturing on EHD Lubrication Films Under Transient Speed Condition
Martin Zimmerman,
Martin Zimmerman
Brno University of Technology, Brno, Czech Republic
Search for other works by this author on:
Ivan Krupka,
Ivan Krupka
Brno University of Technology, Brno, Czech Republic
Search for other works by this author on:
Martin Hartl,
Martin Hartl
Brno University of Technology, Brno, Czech Republicic
Search for other works by this author on:
Pavel Houska
Pavel Houska
Brno University of Technology, Brno, Czech Republic
Search for other works by this author on:
Martin Zimmerman
Brno University of Technology, Brno, Czech Republic
Ivan Krupka
Brno University of Technology, Brno, Czech Republic
Martin Hartl
Brno University of Technology, Brno, Czech Republicic
Pavel Houska
Brno University of Technology, Brno, Czech Republic
Paper No:
IJTC2011-61046, pp. 187-189; 3 pages
Published Online:
February 9, 2012
Citation
Zimmerman, M, Krupka, I, Hartl, M, & Houska, P. "Effect of Surface Texturing on EHD Lubrication Films Under Transient Speed Condition." Proceedings of the ASME/STLE 2011 International Joint Tribology Conference. ASME/STLE 2011 Joint Tribology Conference. Los Angeles, California, USA. October 24–26, 2011. pp. 187-189. ASME. https://doi.org/10.1115/IJTC2011-61046
Download citation file:
11
Views
Related Proceedings Papers
Related Articles
Interaction of Asperities on Opposing Surfaces in Thin Film, Mixed Elastohydrodynamic Lubrication
J. Tribol (April,2008)
Influence of a Surface Bump or Groove on the Lubricating Performance and Dimple Phenomena in Simple Sliding Point EHL Contacts
J. Tribol (July,2004)
On the Surface Dimple Phenomena in Elliptical TEHL Contacts With Arbitrary Entrainment
J. Tribol (January,2003)
Related Chapters
Computer Aided Machine Design
Computer Aided Design and Manufacturing
Understanding the Problem
Design and Application of the Worm Gear
Gear Lubricants and Lubrication—Tomorrow's Requirements
Tribology of Mechanical Systems: A Guide to Present and Future Technologies