GREASE COMPOSITION AND ROLLING SHAFT BEARING

摘要

PROBLEM TO BE SOLVED: To suppress generation of fretting abrasion while maintaining a shaft bearing life.SOLUTION: There are provided a grease composition containing a base oil by mixing mineral oil and synthetic oil with a mass ratio of mineral oil:synthetic oil=0:100 to 20:80 and having kinetic viscosity at 40°C of 70 to 150 mm/s and a thickener containing aromatic diurea and having a maximum diameter of a thickener aggregate of 40 μm or more, thickener projected area of 10% or more and a rolling shaft bearing encapsulating the grease composition.