Abstract: Urea grease composition for constant velocity joints is provided containing base oil, one or more urea thickener compounds, (A) one or more molybdenum sulphurized dialkyldithiocarbamates represented by general formula (I) wherein R1 and R2 are independently chosen from alkyl groups of from 1 to 24 carbons, m+n=4, m is from 0 to 3 and n is from 4 to 1, (B) triphenylphosphorothionate represented by formula (II) and (C) one or more stearic acid metal salts.

Abstract: A constant velocity joint includes an outer race having a plurality of ball grooves formed in an inner spherical surface thereof, which ball grooves extend in a direction of a rotation axis of the outer race, an inner once having a plurality of ball grooves formed in an outer spherical surface thereof, which ball grooves extend in a direction of a rotation axis of the inner race and are paired with the ball grooves of the outer race, and a plurality of balls disposed between the ball grooves of the outer race and the ball grooves of the inner race. In the constant velicity joint, the ball grooves of at least one of the outer race and the inner race are partially formed with relief profiles to provide a plurality of relief groove portions such that a load applied to each of the balls located in the relief groove portions during torque transmission between the inner race and the outer race is smaller than a load applied to each of the balls located in the other portions of the ball grooves.

Abstract: A grease composition for constant velocity joints, having a base oil and a urea-based thickener, which grease additionally contains, (A) molybdenum sulphide dialkyldithiocarbamate and (B) 5,5-dithiobis (1,3,4-thiadiazole-2-thiol); a method of lubricating a constant velocity joint including packing it with grease and a constant velocity joint packed with said grease.

Abstract: A constant velocity joint includes an outer race having a plurality of ball grooves formed in an inner spherical surface thereof, which ball grooves extend in a direction of a rotation axis of the outer race, an inner once having a plurality of ball grooves formed in an outer spherical surface thereof, which ball grooves extend in a direction of a rotation axis of the inner race and are paired with the ball grooves of the outer race, and a plurality of balls disposed between the ball grooves of the outer race and the hall grooves of the inner race. In the constant velicity joint, the hall grooves of at least one of the outer race and the inner race are partially formed wit relief profiles to provide a plurality of relief groove portions such that a load applied to each of the balls located in the relief groove portions during torque transmission between the inner race and the outer race is smaller than a load applied to each of the balls located in the other portions of the ball grooves.

Abstract: Urea grease composition for constant velocity joints is provided containing base oil, one or more urea thickener compounds, (A) one or more molybdenum sulphurized dialkyldithiocarbamates represented by general formula (I) wherein R1 and R2 are independently chosen from alkyl groups of from 1 to 24 carbons, m+n=4, m is from 0 to 3 and n is from 4 to 1, (B) triphenylphosphorothionate represented by formula (II) and (C) one or more stearic acid metal salts.

Abstract: Grease composition for constant velocity joints, comprising a base oil and a urea-based thickener, which grease additionally contains, (A) molybdenum sulphide dialkyldithiocarbamate and (B) 5,5-dithiobis(1,3,4-thiadiazole-2-thiol); a method of lubricating a constant velocity joint comprising packing it with said grease; and a constant velocity joint packed with said grease.