Publication detail

Novel In-Situ Observation of the Grease Constituents in Elastohydrodynamic Contacts by Fluorescence Microscopy

KOŠŤÁL, D. OKÁL, M. FRÝZA, J. KŘUPKA, I. HARTL, M.

Original Title

Novel In-Situ Observation of the Grease Constituents in Elastohydrodynamic Contacts by Fluorescence Microscopy

Type

journal article in Web of Science

Language

English

Original Abstract

Grease is important lubricant for ball bearings as it is used much more often than oil. However, mechanism of the lubrication is not completely clear, especially concerning the role of the thickener in the lubricating process. It was shown that contribution of the thickener to film thickness build-up varies with operating conditions. Also, its influence on the resistive torque of the bearing was proved. However, all studies were in-direct showing its effects. This paper presents new in-situ fluorescence method of the grease constituents’ observation, where both, thickener, and base oil can be observed independently. Two different fluorescence dyes are used to distinguish grease constituents with the use of different microscope setup. Moreover, the new method was tested on two different test rigs. First is typical ball on disc test rig widely used for study of elastohydrodynamic lubrication. Second is ball on ring test rig which more closely represents radial ball bearing conditions. It was shown that thickener engagement is very different for each geometrical configuration.

Keywords

EHD;Grease;Thickener;Base oil;Fluorescence

Authors

KOŠŤÁL, D.; OKÁL, M.; FRÝZA, J.; KŘUPKA, I.; HARTL, M.

Released

7. 11. 2022

Publisher

Springer

ISBN

1023-8883

Periodical

Tribology Letters

Year of study

70

Number

126

State

United States of America

Pages from

1

Pages to

15

Pages count

15

URL

https://doi.org/10.1007/s11249-022-01671-7

BibTex

@article{BUT179875,
  author="David {Košťál} and Michal {Okál} and Josef {Frýza} and Ivan {Křupka} and Martin {Hartl}",
  title="Novel In-Situ Observation of the Grease Constituents in Elastohydrodynamic Contacts by Fluorescence Microscopy",
  journal="Tribology Letters",
  year="2022",
  volume="70",
  number="126",
  pages="15",
  doi="10.1007/s11249-022-01671-7",
  issn="1023-8883",
  url="https://doi.org/10.1007/s11249-022-01671-7"
}