Manual transmission lubricants with improved synchromesh performance
AssigneeThe Lubrizol Corporation
InventorsMichael P. Gahagan, Brian M. O'Connor
Life of this patent
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Abstract
A novel lubricating composition for manual transmissions with improved performance with sintered synchronized components. The lubricating oil composition contains high level of an alkaline earth sulfonate and amine phosphates.
Claims16
A method for preventing wear and improving performance in the synchronizer of a manual transmission by using a lubricant comprising:
- (a) at least about 70% by weight of an oil of lubricating viscosity of at least one of API Group III, IV, V or mixtures thereof,
- (b) about 0.01% to about 2% by weight of an amine salt of a phosphorus-containing acid,
- (c) at least about 0.5% by weight of a basic metal salt of an organic acid,
- (d) about 0% to about 0.7% by weight of a metal deactivator compound, and
- (e) about 0% to about 3% by weight of a boron containing dispersant;
- and
- wherein the synchronizer in the manual transmission has sintered metal surfaces.
A method for preventing wear and improving performance in the synchronizer of a manual transmission by using a lubricant comprising:
- (a) at least about 70% by weight polyalphaolefin (PAO) synthetic oil of lubricating viscosity,
- (b) about 0.05% to about 1.5% by weight of an amine phosphate extreme pressure agent,
- (c) at least about 0.7% by weight overbased magnesium sulfonate,
- (d) about 0.03% to about 0.5% by weight of a dimercaptothiadiazole derivative, and
- (e) about 0.1% to about 2.5% by weight of a borated succinimide dispersant;
- and
- wherein the synchronizer in the manual transmission has sintered metal surfaces.
A method for lubricating a manual transmission designed with synchronizer, using a lubricant comprising the following components:
- (a) at least about 70% by weight polyalphaolefin (PAO) synthetic oil of lubricating viscosity,
- (b) about 0.05% to about 1.5% by weight of an amine phosphate extreme pressure agent,
- (c) at least about 0.7% by weight overbased magnesium sulfonate, and
- (d) about 0.03% to about 0.5% by weight of a dimercaptothiadiazole derivative;
- with the proviso that the lubricant contains less than about 0.1% by weight of a metal free sulfur containing antiwear/extreme pressure agent, and
- wherein the synchronizer in the manual transmission has sintered metal surfaces.
A method for lubricating a manual transmission designed with synchronizer, using a lubricant comprising:
- (a) at least about 70% by weight polyalphaolefin (PAO) synthetic oil of lubricating viscosity,
- (b) about 0.05% to about 1.5% by weight of an amine phosphate extreme pressure agent,
- (c) at least about 0.7% by weight overbased magnesium sulfonate,
- (d) about 0.03% to about 0.5% by weight of a dimercaptothiadiazole derivative, and
- (e) about 0.1% to about 2.5% by weight of a borated succinimide dispersant;
- and
- wherein the synchronizer in the manual transmission has sintered metal surfaces.
A method for preventing wear and improving performance in the synchronizer of a manual transmission by using a lubricant comprising:
- (a) at least about 70% by weight polyalphaolefin (PAO) synthetic oil of lubricating viscosity,
- (b) about 0.05% to about 1.5% by weight of an amine phosphate extreme pressure agent,
- (c) at least about 0.7% by weight overbased magnesium sulfonate,
- (d) about 0.03% to about 0.5% by weight of a dimercaptothiadiazole derivative,
- (e) about 0.1% to about 2.5% by weight of a borated succinimide dispersant, and wherein the synchronizer in the manual transmission has sintered metal surfaces manufactured from a basic metal salt of an organic acid in the sinter composition.
Dependencies are inferred from the claim text.