Fluids for enhanced gear protection
AssigneeThe Lubrizol Corporation
InventorsWilliam Sullivan, Halou Oumar-Mahamat, Ellen Brandes
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Abstract
The invention relates to lubricants which contain a phosphorus to nitrogen ratio of ≧1.0 and a sulfur content of >1.4 wt. %. The phosphorus contribution is primarily from an acid phosphate species and the sulfur content is primarily from an antiwear agent. This lubricant composition has been found to provide exceptional protection to new gears or “green gears”, during the break-in phase.
Claims25
A lubricating composition comprising a basestock, a phosphorus-containing antiwear component, a nitrogen-containing compound, and a sulfur-containing extreme pressure component, said lubricating composition characterized by having an elemental phosphorus to nitrogen weight ratio of greater than or equal to 1.0, based on the weight of the entire lubricating composition, wherein at least 50 wt. % of said antiwear component is provided by at least one acid phosphate having the formula R1O(R2O)P(O)OH, where R1 is hydrogen or hydrocarbyl and R2 is hydrocarbyl, and further characterized by a sulfur content of greater than or equal to 1.5 wt. %.
Dependencies are inferred from the claim text.