A pair of spherical gears connects the intersecting shafts of a CV-joint.
One gear has internal teeth, and the other has external teeth. The gear
design is based on pitch circles that are great circles on theoretical
pitch spheres that are concentric and have identical radii. The internal
teeth are either conically or spherically shaped, while the external
tooth faces are cylindrical with tangential flat extensions. The
spherical gears are shown on half-shafts. The preferred embodiments have
six teeth on each gear, and one preferred embodiment also uses balls for
the internal teeth. The gears, while rotating at high speeds under load,
can intersect throughout a continuous maximum range of 60.degree. or more
in any direction.