Grease composition for constant velocity joint and constant...

C - Chemistry – Metallurgy – 10 – M

Patent

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C10M 169/06 (2006.01) C10M 115/08 (2006.01) C10M 125/22 (2006.01) C10M 129/10 (2006.01) C10M 135/00 (2006.01) C10M 135/10 (2006.01) C10M 135/18 (2006.01) C10M 159/22 (2006.01) C10M 159/24 (2006.01) F16D 3/20 (2006.01)

Patent

CA 2572269

A grease composition for constant velocity joints which comprises the following components (a) to (g); and constant velocity joints prelubricated with the same: (a) a base oil, (b) a diurea thickener represented by the general formula: R1NH-CO-NH-C6H4-p-CH2-C6H4-p-NH-CO-NHR2 (wherein R1 and R2 are each independently alkyl of 8 to 20 carbon atoms, aryl of 6 to 12 carbon atoms, or cycloalkyl of 6 to 12 carbon atoms), (c) a dialkyldithiocarbamic acid molybdenum salt insoluble in the base oil, (d) a dialkyldithiocarbamic acid molybdenum salt soluble in the base oil, (e) molybdenum disulfide, (f) calcium phenate and/or a calcium sulfonate, and (g) a phosphorus-free sulfur- containing extreme-pressure additive. The grease composition can effectively inhibit the temperature rise of constant velocity joints and impart excellent endurance to the joints.

Une composition de graisse pour des joints homocinétiques qui comprend les composants suivants (a) à (g) ; et des joints homocinétiques prélubrifiés avec celle-ci : (a) une huile de base, (b) un épaississant de diurée représenté par la formule générale : R<SUP>1</SUP>NH-CO-NH-C<SUB>6</SUB>H<SUB>4</SUB>-p-CH<SUB>2</SUB>-C<SUB>6</SUB>H<SUB>4</SUB>-p-NH-CO-NHR<SUP>2</SUP> (dans laquelle R<SUP>1</SUP> et R<SUP>2</SUP> sont chacun indépendamment un alkyle de 8 à 20 atomes de carbone, un aryle de 6 à 12 atomes de carbone, ou un cycloalkyle de 6 à 12 atomes de carbone), (c) un sel de molybdène d'acide dialkyldithiocarbamique insoluble dans l'huile de base, (d) un sel de molybdène d'acide dialkyldithiocarbamique soluble dans l'huile de base, (e) un disulfure de molybdène, (f) un phénate de calcium et/ou un a sulfonate de calcium, et (g) un additif extrême pression contenant du soufre dépourvu de phosphore. La composition de graisse peut efficacement inhiber la montée de température des joints homocinétiques et conférer une excellente endurance aux joints.

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