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US 9,540,582 B2Granted
Method of lubricating a driveline device
AssigneeThe Lubrizol Corporation
InventorsWilliam R. S. Barton, Gareth Brown, Mark R. Baker, Michael E. Huston
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Abstract
The invention provides a method of lubricating a mechanical device by supplying a lubricating composition containing an oil of lubricating viscosity and a compound having 2 to 20 hydroxy-carboxylic acid residues. The invention further relates to the use of the compound in a driveline device to provide at least one of antiwear performance, friction modification (particularly for enhancing fuel economy).
Claims20
A method of lubricating a driveline device comprising supplying to the driveline device a lubricating composition comprising:
- (a) an oil of lubricating viscosity and
- (b) 0.01 wt % to 3 wt % of a compound having 2 to 20 repeat units of a residue of a hydroxy-carboxylic acid, wherein the compound is obtained/obtainable by a reacting a hydroxy-carboxylic acid with a hydrogen bonding donor capable of forming an ester or amide group with a carboxylic acid group of the hydroxy-carboxylic acid,
- wherein the hydrogen bonding donor is selected from at least one member of the group consisting of an alcohol, a primary mono-amine and a secondary mono-amine,
- wherein the hydroxy-carboxylic acid is a hydroxy-substituted carboxylic acid having 2 to 10 carbon atoms,
- wherein, when the hydrogen bonding donor is a mono-ol, the mole ratio of mono-ol to the hydroxy-carboxylic acid ranges from 1:1.1 to 1:10, and
- wherein the driveline device is an axle, a gearbox or a manual transmission.
3 more elements
Dependencies are inferred from the claim text.