Grease composition for constant velocity joint and the constant velocity joint

Abstract

The invention provides a grease composition that can improve the durability and the temperature control properties of constant velocity joints and reduce the rotating torque at low temperatures, and a constant velocity joint where the above-mentioned grease composition is packed. The grease composition for constant velocity joints includes (a) a base oil containing a synthetic oil, (b) a thickener, (c) zinc dithiophosphate, (d) molybdenum dialkyl dithiocarbamate sulfide, and (e) zinc dialkyl dithiocarbamate.

1 .- 5 . (canceled) 
     
     
         6 . A grease composition for constant velocity joints, comprising the following components (a) to (e):
 (a) a base oil including a synthetic oil,   (b) a thickener,   (c) zinc dithiophosphate,   (d) molybdenum dialkyl dithiocarbamate sulfide, and   (e) zinc dialkyl dithiocarbamate.   
     
     
         7 . The grease composition for constant velocity joints of  claim 6 , wherein the synthetic oil in the component (a) comprises at least one selected from the group consisting of synthetic hydrocarbon oils and synthetic ester oils. 
     
     
         8 . The grease composition for constant velocity joints of  claim 6 , wherein the content of the zinc dithiophosphate as the component (c), the content of the molybdenum dialkyl dithiocarbamate sulfide as the component (d) and the content of the zinc dialkyl dithiocarbamate as the component (e) are each in the range of 0.1 to 10 mass % of the total mass of the grease composition. 
     
     
         9 . The grease composition for constant velocity joints of  claim 7 , wherein the content of the zinc dithiophosphate as the component (c), the content of the molybdenum dialkyl dithiocarbamate sulfide as the component (d) and the content of the zinc dialkyl dithiocarbamate as the component (e) are each in the range of 0.1 to 10 mass % of the total mass of the grease composition. 
     
     
         10 . The grease composition for constant velocity joints of  claim 6 , further comprising molybdenum disulfide as a component (f). 
     
     
         11 . A constant velocity joint wherein the grease composition of  claim 6  is packed.