| 摘要 |
PURPOSE: To obtain a grease composition for sealing of rolling bearings having extremely excellent property in high-temperature durability (long life), capable of suppressing the occurrence of allophone in cooling and keeping the silence of a sealed bearing over a broad temperature range from high temperatures to low temperatures and exhibiting a rust-preventing property. CONSTITUTION: This grease composition for sealing bearings is obtained by blending a base oil obtained by blending a poly-α-olefin oil with an alkyldiphenyl ether oil in a weight ratio of (0.2-0.8):(0.2-0.8) with 5-40wt.% of an alicyclic diurea compound used as a thickener obtained by reacting a diisocyanate with a monoamine and adding an extreme-pressure additive consisting essentially of a dithiophosphoric acid salt thereto and further containing either one of a dithiocarbamic acid salt or a phosphoric acid ester or the mixture of both compounds to the blend or adding two or more kinds selected from zinc dithiophosphate, molybdenum dithiophosphate and lead dithiophosphate instead of the extreme-pressure additive to the blend, or further blending these components with a sulfonic acid salt and an ester compound as a rust preventing agent. |
