Effects of flow properties of lithium soap greases on bearing torque

Norifumi Miyanaga, Mitsumi Nihei, Jun Tomioka

研究成果: Conference contribution

抄録

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.

本文言語English
ホスト出版物のタイトルEngineering Tribology and Materials III
編集者Yunn Lin Hwang
出版社Trans Tech Publications Ltd
ページ123-127
ページ数5
ISBN(印刷版)9783035714623
DOI
出版ステータスPublished - 2019
イベント4th International Conference on Engineering Tribology and Applied Technology, ICETAT 2018 - Taipei, Taiwan, Province of China
継続期間: 2018 11 162018 11 18

出版物シリーズ

名前Key Engineering Materials
823 KEM
ISSN(印刷版)1013-9826
ISSN(電子版)1662-9795

Conference

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

ASJC Scopus subject areas

  • 材料科学(全般)
  • 材料力学
  • 機械工学

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