Effect of lubricating oils on piston ring friction and scuffing

Y. Wakuri, M. Soejima, T. Kitahara, K. Fujisaki, K. Nuki

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


The effect of a change of the viscosity of lubricating oils and that of adding a friction modifier on the friction and the scuffing development on a piston ring were determined by using a pin-on-disk type reciprocative sliding test machine simulating the reciprocative sliding of a piston ring and an actual working engine in which the friction in the interaction between the cylinder liner supported by a hydrostatic bearing and the piston assembly was measured. As a result, the viscous friction in the mid-stroke as a main peculiarity of the piston assembly friction was established. Besides, it was found that in the vicinity of the dead center, a peak friction occurred due to the boundary contact conditions and the application of a low-viscosity lubricating oil was rather effective in a reduction of the friction loss but when the friction peak near the dead center increases the scuffing resistance is reduced. In this case, the addition of an appropriate friction modifier resulted in a lower boundary friction near the dead center and an increase of the scuffing resistance. (Authors)

Original languageEnglish
Pages (from-to)437-449
Number of pages13
JournalJapanese Journal of Tribology
Issue number5
Publication statusPublished - Jan 1 1995
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering
  • Surfaces, Coatings and Films
  • Materials Chemistry

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