Constant velocity universal joint

A constant velocity joint comprising,

• an outer joint member formed with three track grooves having roller guide surfaces arranged in circumferentially opposed relation to each other;
• a tripod member having three radially projecting leg shafts;
• a plurality of rollers inserted in said track grooves;
• and
• a ring fitted on each of said leg shafts to support said rollers for rotation, said rollers being movable along the roller guide surfaces axially of the outer joint member,
• wherein each roller includes a set of annular roller portions and a plurality of balls interposed between outer raceway surfaces formed in rows in an inner periphery of the annular roller portions and two rows of inner raceway surfaces formed in an outer periphery of said ring, and
• wherein an inner peripheral surface of said ring has a convexly arcuate section and an outer peripheral surface of each leg shaft has a sectional shape which contacts the inner peripheral surface of said ring in a direction orthogonal to an axis of the constant velocity joint and which defines a clearance between said each leg shaft and the inner peripheral surface of said ring axially of the constant velocity joint.