Effects of flow properties of lithium soap greases on bearing torque

Norifumi Miyanaga, Mitsumi Nihei, Jun Tomioka

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

This study describes the influence of flow properties of lithium soap greases on torque of small ball bearings. Three types of greases with different worked penetration were tested in this study. Their rheological properties are revealed by a cone plate type rheometer. Shear stresses under various shear rates are fitted with the Herschel-Bulkley equation. In addition, viscoelastic behaviors of the greases are measured by small amplitude oscillatory shear. The crossover stress that means the shear stress at G’=G” is obtained for the greases. Then, the bearing torque when three types of greases are used as a lubricant is measured. As the results, the grease with higher crossover stress shows the lower bearing torque regardless of that it has larger apparent viscosity. On the other hand, the grease with lower crossover stress shows the higher bearing torque regardless of that it has lower apparent viscosity. These results imply that the channeling state appears in the grease with higher crossover stress while the churning state appears in the grease with lower crossover stress.

Original languageEnglish
Title of host publicationEngineering Tribology and Materials III
EditorsYunn Lin Hwang
PublisherTrans Tech Publications Ltd
Pages123-127
Number of pages5
ISBN (Print)9783035714623
DOIs
Publication statusPublished - 2019
Event4th International Conference on Engineering Tribology and Applied Technology, ICETAT 2018 - Taipei, Taiwan, Province of China
Duration: 2018 Nov 162018 Nov 18

Publication series

NameKey Engineering Materials
Volume823 KEM
ISSN (Print)1013-9826
ISSN (Electronic)1662-9795

Conference

Conference4th International Conference on Engineering Tribology and Applied Technology, ICETAT 2018
Country/TerritoryTaiwan, Province of China
CityTaipei
Period18/11/1618/11/18

Keywords

  • Bearing torque
  • Flow properties
  • Lithium soap greases

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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