To provide a grease composition suppressing occurrence of white structure release and corrosion and capable of keeping good lubrication for a long time when water is mixed therein and each rolling bearing for wind power generator, for construction machine and for steel rolling machine enclosing the grease composition and excellent in water resistance.
The grease composition comprises: a base oil composed of at least one kind of lubricating oil selected from a mineral oil; a synthetic oil having 70-250 mm2/s kinematic viscosity at 40°C; and a thickener, and further comprises at least one kind of additive selected from a carboxylic acid-based rustproof additive, a carboxylic acid salt-based rustproof additive and an ester-based rustproof additive in a ratio of 0.1-20 mass% based on the grease total amount. Each rolling bearing for wind power generator, for construction machine and for steel rolling machine is obtained by each enclosing the grease composition.
KURAISHI ATSUSHI
MATSUMOTO KANEAKI
Hironori Honda
Toshimitsu Ichikawa
Takeshi Takamatsu