Resonance shear measurement on lubrication properties of engine oils: Effects of additives

Shogo Shibazaki, Masashi Mizukami, Sae Yoshida, Takuya Yanagimachi, Tadao Tanabe, Kazue Kurihara

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

We investigated properties of lubricants confined between mica surfaces using resonance shear measurement (RSM) which can monitor the rheological and tribological properties of the lubricants as a function of the surface separation distance (D) as well as the normal load (L). The formulations of the five lubricants investigated were; oil A (mineral oil + viscosity modifier (VM) + Antiwear additive + Metallic detergent + Ashless dispersant + Anti-oxidant + Foam inhibitor), oil B (oil A + Molybdenum dithiocarbamate (MoDTC)), oil-C (oil A + Glycerol monooleate (GMO), oil D (mineral oil + viscosity modifier (VM)), and oil E (mineral oil only). The oil E showed the friction coefficient (p) of 0.45 at the normal load (I) below 2.0 mN. The oil D, which contained VM, showed significant decrease in the n value to 0.19. In the case of oil A, B, C, the thickness of lubricant layers became significantly thicker than those of oil E and D, however, the no clear reduction in the jj value compared with oil D was observed. These results have demonstrated that the RSM can evaluate the contribution of the each component on the lubrication in order to optimize their properties and performance.

Original languageEnglish
Pages (from-to)284-293
Number of pages10
JournalToraibarojisuto/Journal of Japanese Society of Tribologists
Volume63
Issue number4
Publication statusPublished - 2018 Jan 1

Keywords

  • Additive
  • Engine oil
  • Friction
  • Hard wall thickness
  • Resonance shear measurement (RSM)
  • Viscosity

ASJC Scopus subject areas

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

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