Constant velocity universal joint

A constant velocity universal joint comprising:

• an outer joint part including three axially extending, circumferentially distributed longitudinal recesses with circumferentially opposed tracks spanned by a recess base and said outer joint part defining a first axis, said tracks having surfaces which are grooved so as to have the shape of having a common longitudinal axis circular cylindrical portion and longitudinally extending guiding shoulder faces formed on said outer joint part, said shoulder faces adjacent said tracks and extending radially inwardly from said tracks;
• an inner joint part including three radial circumferentially distributed arms each engaging one of the longitudinal recesses and said inner joint part defining a second axis;
• roller assemblies carried on said inner joint part and having roller carriers and roller elements, said roller carriers and roller elements, each having a common radial axis, said roller elements having running faces in the shape of a true spherical portion having a single center and being axially guided so as to roll on the tracks in the longitudinal recesses of the outer joint part, the roller carriers being guided on the arms so as to be pivotable and longitudinally movable relative to a respective arm axis and the roller elements being coaxially supported on the roller carriers so as to be rotatable, and said roller assemblies being supported on said recess bases and only said roller elements being supported on said longitudinally extending guiding shoulder faces to prevent said roller assemblies from tilting relative to the outer joint part, said guiding shoulder faces being provided at an angle of inclination relative to said common radial axes of said roller assemblies;
• and
• the roller elements each including an annular shoulder face adjoining the roller element spherical running face and forming a cone with half the opening angle approximately corresponding to said angle of inclination, said annular shoulder face providing supporting contact between the respective roller assembly and the guiding shoulder faces.