Publication detail

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

KŘUPKA, I. HARTL, M. ZIMMERMAN, M. HOUŠKA, P. JANG,S.

Czech title

Vliv cílené modifikace topografie na elastohydrodynamicky mazaný kontakt za neustálených provozních podmínek

English title

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

Type

journal article - other

Language

en

Original abstract

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.

Czech abstract

Článek shrnuje výsledky studia elastohydrodynamicky mazaných bodových kontaktů za neustálených provozních podmínek. Tlošťka mazacího filmu je studována v závislosti na rychlostech třecích povrchů, které simulují chování vačky a zdvihátka. Získané výsledky jsou porovnány s numerickým řešením a je ukázán vliv cílené modifikace topografie na utváření mazacího filmu v kritických fázích provozních podmínek.

English abstract

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.

Keywords in Czech

Elastohydrodynamické mazání; Tloušťka filmu; Cílená modifikace topografie; Neustálené provozní podmínky

Keywords in English

Elastohydrodynamic; Film thickness; Surface texturing; Transient speed conditions

RIV year

2011

Released

13.05.2011

Publisher

Elsevier

Location

Nizozemí

ISSN

0301-679X

Volume

44

Number

10

Pages from–to

1144–1150

Pages count

7

BIBTEX


@article{BUT74978,
  author="Ivan {Křupka} and Martin {Hartl} and Martin {Zimmerman} and Pavel {Houška},
  title="Effect of surface texturing on elastohydrodynamically lubricated contact under transient speed conditions",
  year="2011",
  volume="44",
  number="10",
  month="May",
  pages="1144--1150",
  publisher="Elsevier",
  address="Nizozemí",
  issn="0301-679X"
}