Effect of start-stop motion on contact replenishment in a grease lubricated deep groove ball bearing

Hui Cen*, Piet M. Lugt

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

9 Citations (Scopus)
136 Downloads (Pure)

Abstract

The impact of start-stops on the thickness of lubricating films in the Elasto-Hydrodynamic Lubrication (EHL) contacts in grease lubricated rolling bearings is different from that in oil lubricated bearings. This paper shows that the film thickness drops to zero quickly due to the absence of hydrodynamic effects during a stop. It quickly increases to an unexpected large value when the bearing is stopped for a long time and started up again, although this large value only lasts for a very short time. This is due to additional track replenishment during the stop leading to an initially thicker film than expected. This increase is found to be determined by the rotational speed of the bearing, stop-time, base oil viscosity and width of the contacts. The start-stop effect is similar for unidirectional and oscillating speeds, provided that the stopping time is long enough.

Original languageEnglish
Article number106882
JournalTribology international
Volume157
Early online date19 Jan 2021
DOIs
Publication statusPublished - May 2021

Keywords

  • Ball bearing
  • Grease lubrication
  • Replenishment
  • Start-stop
  • 22/1 OA procedure

Fingerprint

Dive into the research topics of 'Effect of start-stop motion on contact replenishment in a grease lubricated deep groove ball bearing'. Together they form a unique fingerprint.

Cite this