| 摘要 |
In a constant velocity universal joint including a double roller type roller unit, a cylindrical surface is formed in a radially outer surface of the outer roller; a flat engagement surface which is engaged with the cylindrical surface is formed in each of the guide grooves of the outer joint member; and the cylindrical surface satisfies following two equations, W 1 >PCR (1-cos theta)/2+mu<SUB>3</SUB>R 3 +mu<SUB>2</SUB>R 1 , W 2 >3PCR (1-cos theta)/2-mu<SUB>3</SUB>R 3 +mu<SUB>2</SUB>R 1 wherein W 1 , W 2 : a length from a center of the cylindrical surface to each of axially both end portions; PCR: a distance from an axis of the inner joint member to a center of the convex sphere of each of the leg shafts; theta: a required maximum joint angle; R 1 , R 3 : radii of the cylindrical surface and the concave sphere, respectively; and mu<SUB>2</SUB>, mu<SUB>3</SUB>: friction coefficients between the inner roller and the outer roller, and between the convex sphere and the concave sphere, respectively.
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