Grease composition for vehicular hub unit bearings
AssigneesKyodo Yushi Co., Ltd., Nsk Ltd.
InventorsKazuki Isa, Yuki Takeyama, Masatoshi Ijima, Suguru Sugawara, Hiroaki Ishikawa
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Abstract
A grease composition for vehicular hub unit bearings is provided, in which a base oil is a synthetic hydrocarbon oil having a kinematic viscosity at 40° C. of 25-50 mm2/s, a thickener is an alicyclic aliphatic diurea compound, based on a total mass of the composition, 0.1-5% by mass of a carboxylic acid-based corrosion inhibitor, 0.1-5% by mass of a carboxylic acid salt-based corrosion inhibitor, and 0.1-3% by mass of an amine salt of a fatty acid are contained, and a worked penetration is 220-270.
Claims8
A grease composition for vehicular hub unit bearings comprising:
- a base oil;
- a thickener;
- and
- an additive,
- wherein the base oil is a synthetic hydrocarbon oil having a kinematic viscosity at 40° C. of 25-50 mm2/s,
- the thickener is an alicyclic aliphatic diurea compound,
- the additive includes, based on a total mass of the composition, 0.2-0.4% by mass of a carboxylic acid-based corrosion inhibitor which is-contains an alkenyl succinic acid half ester, 0.3-0.4% by mass of a carboxylic acid salt-based corrosion inhibitor which comprises zinc abietate, and 0.9-1.1% by mass of an amine salt of a fatty acid wherein an amine constituting the amine salt is selected from the group consisting of octylamine, laurylamine, myristylamine, and stearylamine, and
- a worked penetration is 220-270.
Dependencies are inferred from the claim text.