Effects of lubricant viscosity on the mixed lubrication of a piston ring pack in an internal combustion engine

Toshiro Hamatake, Yutaro Wakuri, Mitsuhiro Soejima, Tatsumi Kitahara

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

A theoretical analysis is presented of the mixed lubrication of a piston ring pack. The analysis comprises Patir and Cheng's average flow model and Greenwood and Tripp's asperity interaction model, and is developed to consider the shear thinning effect of a non-Newtonian fluid, multigrade lubricant. The friction characteristics of the piston ring pack for both monograde and multigrade lubricants are investigated. It is found that a decrease in the lubricant viscosity is effective in reducing the friction loss, although this increases the boundary friction at the beginning of the expansion stroke. The friction characteristics are markedly affected by the shear thinning effect when multigrade lubricants are used.

Original languageEnglish
Pages (from-to)101-117
Number of pages17
JournalLubrication Science
Volume15
Issue number2
DOIs
Publication statusPublished - Feb 2003

All Science Journal Classification (ASJC) codes

  • Surfaces, Coatings and Films
  • Materials Chemistry

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