which are formed three raceways 10 11 12 which have a circular cross sectional shape and are each defined by two confronting recesses each of the rollers is received in one of the raceways thus defined in the illustrated embodiment the joint is assumed to be operating at an angle which is the maximum break angle that is to say the maximum angular deviation between the two shafts the two axes x 1 x 1 and y y of the two shafts therefore make therebetween an angle u03c3 the centres g1 g2 g3 of the three rollers being disposed in such manner that in the position shown in fig1 and 2 the point g3 is located at the end of the associated raceway 12 whereas in the position shown in fig3 and 4 the joint is assumed to have turned through 180 u00b0 the roller 8 then occupying the opposite extreme position shown at g3 the axis of the shaft 1 then has the position x 2 x 2 according to the invention the bell 9 comprises three recesses 13 the shape of which is seen best in fig2 and 4 which permit the shaft to occupy the illustrated position of maximum break angle it can be seen clearly from this drawing that the distance e between the two extreme positions x 1 x 1 x 2 x 2 of the axis of the shaft 1 resulting from the planetary motion of the latter in the course of the rotation of the joint determines the minimum depth that the recesses 13 provided inside the bell must have to allow the maximum break angle of the illustrated joint without going into the details of the calculations which have to.