Constant velocity joint

A constant velocity universal joint having an instantaneous homokinetic plane, the joint comprising:

• a first shaft having a first yoke attached thereto, said first shaft having a first shaft axis and a fit socket at one end of said first shaft, said first socket being concentric about said first shaft axis;
• a second shaft having a second yoke, smaller than said first yoke, attached thereto, said second shaft having a second shaft as and a second socket at one end of said second shaft, said second socket being concentric about said second shaft axis
• an outer member pivotally connected to said first yoke about a first rotation axis, said first rotation axis being perpendicular to said first shaft axis;
• an inner member pivotally connected to said second yoke about a second rotation axis, said second rotation axis being perpendicular to said second shaft axis;
• wherein said outer member is pivotally connected to said inner member about a third rotation axis, said third rotation axis being perpendicular to both said first and second rotation axes and wherein all five of said axes intersect at a joint center point;
• and
• constraining means for constraining said third rotation axis to continuously lie generally within said instantaneous homokinetic plane wherein said constraining means comprises at least two members which rotate with respect to each other about a constraining means axis which is normal to said instantaneous homokinetic plane, wherein one of said two members comprises first and second balls and wherein said firs and second sockets slidably receive said first and second balls
• wherein said constraining means comprises:
• a cylindrical stud unit having a stud axis, said first and second balls, a first rod and a third ball, wherein centers of said first and second balls are connected by a center line which is at least one of parallel and coincident with said stud axis;
• a cylindrical jacket having a jacket axis and a slot;
• a second rod connected to said cylindrical jacket and extending away from said jacket axis, said second rod ending in a fourth ball;
• and
• wherein said first rod extends away from said stud axis, said cylindrical stud sits rotatably about said stud as within said cylindrical jacket, said first rod extends through said slot and center points of said third and fourth balls lie in a plane that perpendicularly bisects said center line, and
• wherein said inner member has two socket portions concentric about said third rotation axis for slidably receiving said third and fourth balls.