Grease composition for constant velocity joint
AssigneeNtn Corporation
InventorsTakashi Okaniwa, Kiyoshi Takeuchi, Toshiharu Kato, Keizo Nagasawa
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Abstract
A grease composition for constant velocity joint, particularly Zeppa type joint comprises a base oil and contains (A) a particular diurea compound as a thickener, (B) molybdenum sulfide dialkyldithiocarbamate, (C) an extreme pressure additive of zinc dithiophosphate, (D) a sulfur-phosphorus series extreme pressure additive containing no metallic element and having a sulfur content of 10-30% by weight and a phosphorus content of 0.5-5% by weight, and (E) lead dialkyldithiocarbamate as an essential component.
Claims4
A grease composition for constant velocity joint comprising a base oil, and containing (A) 5-25% by weight of a diurea compound represented by the following general formula:
- ##STR7## wherein each of R.sub.1 and R.sub.2 is an aryl group or a cyclohexyl group having a carbon number of 6, and ratio of the aryl group having a carbon number of 6 is 100-25 mol % as a thickener, (B) 0.5-3% by weight of molybdenum sulfide dialkyldithiocarbamate, (C) 0.5-3% by weight of an extreme pressure additive of zinc dithiophosphate represented by the following general formula:
- ##STR8## wherein R is an alkyl group or an aryl group, (D) 0.5-3% by weight of a sulfur-phosphorus series extreme pressure additive containing no metallic element and having a sulfur content of 10-30% by weight and a phosphorus content of 0.5.5% by weight, and (E) 0.5.3% by weight of lead dialkyldithiocarbamate.
Dependencies are inferred from the claim text.