CPC C10M 169/00 (2013.01) [C10M 101/02 (2013.01); C10M 107/02 (2013.01); C10M 115/08 (2013.01); C10M 129/74 (2013.01); C10M 133/12 (2013.01); C10M 141/06 (2013.01); F16C 33/102 (2013.01); C10M 2203/003 (2013.01); C10M 2205/0206 (2013.01); C10M 2207/283 (2013.01); C10M 2215/1026 (2013.01); C10M 2215/26 (2013.01); C10N 2020/06 (2013.01); C10N 2030/02 (2013.01); C10N 2030/10 (2013.01); C10N 2030/12 (2013.01); C10N 2040/02 (2013.01); C10N 2050/10 (2013.01)] | 11 Claims |
1. A lubricating method, comprising:
lubricating a bearing used under a high-speed rotation condition with a DN value of 100,000 or more by a grease composition that comprises:
a base oil (A), and
a urea-based thickener (B),
wherein particles containing the urea-based thickener (B) in the grease composition have an arithmetic mean particle diameter of 2.0 μm or less on an area basis when measured by a laser diffraction scattering method.
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