Title:
GREASE COMPOSITION FOR ROLLING BEARING
Document Type and Number:
Japanese Patent JP2018168221
Kind Code:
A
Abstract:
To provide urea grease that maintains basic properties such as heat resistance and water resistance required of grease for a bearing used in a machine of an iron-manufacturing facility and has a function of sufficiently forming a grease lubrication film especially under a severe lubrication condition such as a low speed and high load condition to prevent fatal stepped wear from occurring on the raceway surfaces of the inner and the outer rings of a bearing.SOLUTION: There is provided a urea grease composition for a rolling bearing, comprising a diurea thickening agent represented by formulae (a) to (c), base oil of a dynamic viscosity at 40°C of 150 to 400 mm/sec and of a viscosity index of lower than 120, i.e., mineral oil belonging to the group 1 or the group 2 of the API classification, and a specific amount of calcium salicylate and calcium sulfonate, which grease composition is of specific consistency and is suitable for a low speed rotary bearing. (a) RNHCONHRNHCONHR, (b) RNHCONHRNHCONHR, (c) RNHCONHRNHCONHR, (Ris a diphenylmethane residue; Ris a 6-10C saturated hydrocarbon group; and Ris a 12-18C saturated hydrocarbon group).SELECTED DRAWING: None
Inventors:
FUJII AKIRA
HIRANO TAKAHIRO
KONDO MASAYUKI
OKUDA YUKARI
NAGANO KATSUMI
MUKAI HISAYOSHI
KATO SHOTA
TANAKA KEIJI
FUJIMAKI YOSHITOMO
WATANABE KAZUYA
HIRANO TAKAHIRO
KONDO MASAYUKI
OKUDA YUKARI
NAGANO KATSUMI
MUKAI HISAYOSHI
KATO SHOTA
TANAKA KEIJI
FUJIMAKI YOSHITOMO
WATANABE KAZUYA
Application Number:
JP2017064879A
Publication Date:
November 01, 2018
Filing Date:
March 29, 2017
Export Citation:
Assignee:
NIPPON STEEL & SUMITOMO METAL CORP
NIPPON STEEL & SUMIKIN CHEM CO
SHELL LUBRICANTS JAPAN KK
NIPPON STEEL & SUMIKIN CHEM CO
SHELL LUBRICANTS JAPAN KK
International Classes:
C10M169/00; C10M101/02; C10M115/08; C10M129/54; C10M135/10; C10M143/02; C10M159/06; C10M159/22; C10M159/24
Attorney, Agent or Firm:
Ito On