US Patent 7785205 Cross groove constant velocity universal joint

A cross groove constant velocity universal joint for a drive shaft or a propeller shaft of an automotive vehicle includes an inner ring and an outer ring each having ball grooves which are alternately slanted in respective directions opposite to each other while alternating with each other in a direction circumferentially thereof. Torque transmission balls are positioned at a crossing area where each of the ball grooves in the inner ring and the associated ball groove in the outer ring are crossed with each other. A cage is provided to retain the torque transmission balls. The number of torque transmission balls is ten, and a crossing angle between the axis of the inner or outer ring and each of the ball grooves in the inner or outer ring is within the range of 10 to 15° or 6 to 9° for the drive shaft or the propeller shaft, respectively.