Grease composition for constant velocity joints
AssigneeKyodo Yushi Co., Ltd.
InventorsKiyoshi Takeuchi, Tuyoshi Sasaki
Life of this patent
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Abstract
A grease composition for constant velocity joints comprises (a) a base oil; (b) a lithium-containing thickener selected from the group consisting of lithium soap and lithium complex soap; (c) an organic molybdenum compound selected from the group consisting of molybdenum dithiophosphates and molybdenum dithiocarbamates; (d) a zinc dithiophosphate; and optionally (e) a metal salt selected from the group consisting of metal salts of oxidized waxes, metal salts of petroleum sulfonates and metal salts of alkyl aromatic sulfonates. The grease composition for constant velocity joints exhibits a substantially improved effect of reducing friction coefficient and a substantially improved effect of preventing the occurrence of vibration.
Claims8
A grease composition for constant velocity joints, which comprises:
- (a) a base oil;
- (b) a lithium-containing thickener selected from the group consisting of lithium soap and lithium complex soap;
- (c) an organic molybdenum compound selected from the group consisting of molybdenum dithiophosphates and molybdenum dithiocarbamates, wherein the content of said organic molybdenum compound is 0.5 to 10.0% by weight based on the total weight of the grease composition;
- (d) a zinc dithiophosphate, wherein the content of said zinc dithiophosphate is 0.5 to 5.0% by weight based on the total weight of the grease composition;
- and
- (e) a metal salt selected from the group consisting of metal salts of oxidized waxes, metal salts of petroleum sulfonates and metal salts of alkyl aromatic sulfonates, wherein said metal salt is a sodium, magnesium, calcium or barium salt, and the content of said metal salt if 0.5 to 5.0% by weight based on the total weight of the grease composition.
Dependencies are inferred from the claim text.