Differential with balls or rollers on convergent elliptical tracks

A differential comprising:

• a casing containing a cylinder rotatable on bearings positioned between the casing and the cylinder;
• two shafts positioned within the cylinder axially adjacent and concentric to one another and configured to receive a drive torque applied from the cylinder, the two shafts including grooves positioned on external surfaces of the two shafts;
• translation tracks longitudinally positioned on an inner wall of the cylinder;
• translators positioned in the translation tracks between the cylinder and the two shafts, the translators including through holes and balls positioned in the through holes tangent to the inner wall of the cylinder, with the balls at least partially engaging respective ones of the grooves of the two shafts, thereby providing a torque transmitting connection between the cylinder and the two shafts;
• wherein the grooves are concave and curve around the two shafts;
• a first shaft of the two shafts having first and second grooves of the grooves, the first groove having a curve of a first configuration and the second groove having a curve of a second configuration, the second groove being positioned adjacent the first groove, a second shaft of the two shafts having third and fourth grooves, the third groove having a curve of the first configuration and the fourth groove having a curve of the second configuration, the fourth groove being positioned adjacent the third groove;
• wherein the first and third grooves having the curves of the first configuration run parallel to one another, and the fourth groove having the curve of the second configuration mirrors the second groove having the curve of the second configuration, wherein peaks and valleys of the second and fourth grooves are angularly offset by 45° from peaks and valleys of the first and third grooves, respectively.