Grease composition and machine elements

Abstract

A grease composition which contains a large amount of thickener, and may prevent a flaking effectively for a long period of time, and machine elements in which the grease composition is filled are provided. A grease composition comprising a thickener and a base oil, characterized in that the thickener contains a diurea compound represented by the Formula (I): R 1 —NHCONH—R 2 —NHCONH—R 3 ,  (I) wherein R 1 and R 3 are a phenyl group and/or a cyclohexyl group, R 2 is a C 6 -C 15 divalent hydrocarbon group, and the molar ratio of cyclohexyl group/(cyclohexyl group+phenyl group) in R 1 and R 3 is 0.95 to 0.10.

1 . A grease composition comprising a thickener and a base oil, characterized in that the thickener contains a diurea compound represented by the Formula (I):
   R1-NHCONH—R2-NHCONH—R3,  (I)   wherein R1 and R3 are a phenyl group and/or a cyclohexyl group, R2 is a C6-C15 divalent hydrocarbon group, and the molar ratio of cyclohexyl group/(cyclohexyl group+phenyl group) in R1 and R3 is 0.95 to 0.10.   
   
   
       2 . The grease composition according to  claim 1 , wherein the base oil comprises a mineral oil. 
   
   
       3 . The grease composition according to  claim 1 , wherein the base oil comprises a phenyl ether based synthetic oil. 
   
   
       4 . The grease composition according to  claim 1 , which is for rolling lubrication units and/or rolling-sliding lubrication units. 
   
   
       5 . The grease composition according to  claim 1 , which is for constant velocity joints and/or gears for automobiles. 
   
   
       6 . The grease composition according to  claim 1 , which is for rolling bearings. 
   
   
       7 . A machine element in which the grease composition according to  claim 1  is filled. 
   
   
       8 . The machine element according to  claim 7 , which is a constant velocity joint and/or a gear for automobiles. 
   
   
       9 . The machine element according to  claim 7 , which is a rolling bearing.