Constant velocity universal ball joint

A constant velocity universal ball joint comprising:

• a bell-shaped outer joint part open at one end, longitudinally extending circumferentially distributed outer ball tracks on an inner surface of said outer joint part, said outer ball tracks, viewed from the open end, being axially undercut-free, and inner faces in said outer part positioned between said outer ball tracks;
• an inner joint part with longitudinally extending circumferentially distributed inner ball tracks, said inner joint part being positioned within the outer part such that the outer and inner ball tracks are arranged radially opposite one another to form pairs;
• a torque transmitting ball being received in each track pair;
• a cage arranged between the outer joint part and the inner joint part, said cage including circumferentially distributed cage windows holding the balls in a common plane and guiding the balls on to the angle bisecting plane when the respective axes of the outer and inner joint part are articulated relative to one another;
• and
• wall regions in said outer joint part .›.in a first position starting from the open end and being axially limited, in a second position said wall regions deformed radially inwardly.!., said wall regions being radially inwardly deformed, said wall regions axially extend a limited distance from the open end, and said wall regions arranged between two outer ball tracks, the width of said wall regions being smaller than the circumferentially directed distance between the respective outer ball tracks, said deformed wall regions each forming cage guiding faces positioned between the outer ball tracks and providing support towards the open end.