Constant velocity joint

A constant velocity joint assembly for a vehicle having a fixed type constant velocity joint linked to one end of a shaft portion of a vehicle, and a plunging type constant velocity joint linked to the other end of said shaft portion,

• wherein said fixed type constant velocity joint comprises:
• an outer joint member having eight axially extending curved guide grooves formed in a spherical inner surface thereof;
• an inner joint member having eight axially extending curved guide grooves formed in a spherical outer surface thereof;
• eight ball tracks defined between said guide grooves of said outer joint member and said guide grooves of said inner joint member corresponding thereto, all of said ball tracks being enlarged in wedge form in one sense of the axial direction;
• eight torque transmitting balls disposed in each of said ball tracks;
• a cage having eight pockets for storing said torque transmitting balls, wherein the ratio R2(=DOUTER/PCDSERR) of an outer diameter (DOUTER) of said outer joint member to the pitch circle diameter (PCDSERR) of a tooth profile formed in an inner surface of said inner joint member of said fixed type constant velocity joint is within the range of 2.5≦R2≦3.5.

A constant velocity joint assembly for a vehicle having a fixed type constant velocity joint linked to one end of a shaft portion of a vehicle, and a plunging type constant velocity joint linked to the other end of said shaft portion,

• wherein said fixed type constant velocity joint comprises:
• an outer joint member having eight axially extending curved guide grooves formed in a spherical inner surface thereof;
• an inner joint member having eight axially extending curved guide grooves formed in a spherical outer surface thereof;
• eight ball tracks defined between said guide grooves of said outer joint member and said guide grooves of said inner joint member corresponding thereto, all of said ball tracks being enlarged in wedge form in one sense of the axial direction;
• eight torque transmitting balls disposed in each of said ball tracks;
• a cage having eight pockets for storing said torque transmitting balls, wherein the ratio R1(=PCDBALL/DBALL) of the pitch circle diameter (PCDBALL) of said torque transmitting balls to the diameter (DBALL) of said torque transmitting ball of said fixed type constant velocity joint is within the range of 3.3≦R1≦5.0.