Grease composition for constant velocity joints
AssigneeGKN Driveline International GmbH
InventorsJisheng E, Stefanie Rosenkranz, Jörg Berlingen, Frank Reher
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Abstract
The disclosure relates to an improved grease composition for use in constant velocity joints, especially ball joints and/or tripod joints used in the drivelines of motor vehicles, with the grease composition comprising at least one base oil, at least one simple or complex soap thickener, at least one zinc sulphonate, at least one molybdenum dithiocarbamate in the solid state, and at least one molybdenum dithiophosphate.
Claims14
A grease composition for use in constant velocity joints comprising
- a) at least one base oil;
- b) at least one simple or complex soap thickener;
- c) at least one zinc sulphonate;
- d) at least one molybdenum dithiocarbamate in the solid state;
- and
- e) at least one molybdenum dithiophosphate;
- wherein the ratio between the percent-by-weight (wt-%) amount of the at least one zinc sulphonate and both the amount of the at least one molybdenum dithiocarbamate and the amount of the at least one molybdenum dithiophosphate is in a range between approximately 0.2:1 to approximately 2.5:1;
- wherein the total amount of the at least one zinc sulphonate is comprised in an amount between approximately 0.3 wt-% and approximately 3.0 wt-% of the total amount of the grease composition;
- wherein the total amount of the at least one zinc sulphonate, of the at least one molybdenum dithiocarbamate, as well as of the at least one molybdenum dithiophosphate, is at most 10 wt-% of the total amount of the grease composition;
- wherein the at least one molybdenum dithiophosphate acts as a metal surface activator of the at least one zinc sulphonate;
- and wherein the zinc sulphonate comprises sulphur in an amount between approximately 33 wt-% and approximately 50 wt-%, the wt-% referring to the total amount of the zinc sulphonate.
A constant velocity joint comprising a grease composition comprising a) at least one base oil;
- b) at least one simple or complex soap thickener;
- c) at least one zinc sulphonate;
- d) at least one molybdenum dithiocarbamate in the solid state;
- and
- e) at least one molybdenum dithiophosphate;
- wherein the ratio between the percent-by-weight (wt-%) amount of the at least one zinc sulphonate and both the amount of the at least one molybdenum dithiocarbamate and the amount of the at least one molybdenum dithiophosphate is in a range between approximately 0.2:1 to approximately 2.5:1;
- wherein the total amount of the at least one zinc sulphonate is comprised in an amount between approximately 0.3 wt-% and approximately 3.0 wt-% of the total amount of the grease composition;
- wherein the total amount of the at least one zinc sulphonate, of the at least one molybdenum dithiocarbamate, as well as of the at least one molybdenum dithiophosphate, being at most 10 wt-% of the total amount of the grease composition;
- wherein the at least one molybdenum dithiophosphate acts as a metal surface activator of the at least one zinc sulphonate;
- and wherein the zinc sulphonate comprises sulphur in an amount between approximately 33 wt-% and approximately 50 wt-%, the wt-% referring to the total amount of the zinc sulphonate.
Dependencies are inferred from the claim text.