Patent ID: 7762894

Claim:
A constant velocity universal joint, comprising: an outer member, one end of which is connected to a first transmission shaft and having an opened tubular member at the other end thereof, and further having a plurality of guide grooves separated mutually from each other at predetermined intervals and being disposed on an inner portion of said tubular member, extending from said one end toward said other end; an inner member having at one end thereof sliding contact members held in sliding contact with said guide grooves in said tubular member of said outer member, and wherein said other end thereof is connected to a second transmission shaft; and a boot covering said outer member and said second transmission shaft, with respective ends thereof being fixed to said outer member and to said second transmission shaft, wherein said boot is formed of a polyester-based thermoplastic elastomer, and wherein a grease is enclosed inside said boot containing a base oil, a thickening agent comprising a diurea-based compound, a molybdenum dialkyldithiocarbamate sulfide represented by the following equation, a sulfur-phosphorus based extreme pressure agent made up of a sulfur-phosphorus based compound containing sulfur and phosphorus as constituent elements thereof, and potassium borate hydrate, wherein R5 and R6 represent, respectively and independently, 1-4C alkyl groups, and further, wherein m and n are integers lying in a range of 0 to 4 and satisfying the equation m+n=4.