Patent ID: 7635306

Claim:
A tripod type constant velocity joint comprising: an outer member having three guide grooves formed on its inner circumferential surface and extending in an axial direction of said outer member; an inner member disposed inside said outer member and having a boss portion and three trunnions extending radially from said boss portion and to be respectively inserted into said guide grooves; and three roller units, each comprising: an inner roller having a hollow cylindrical shape and supported rotatably by a respective one of said trunnions; an outer roller having a hollow cylindrical shape, engaged with a respective one of said guide grooves so as to be capable of rolling, and having an engaging groove on its inner circumferential surface; a needle bearing disposed between said inner roller and said outer roller so as to be capable of rolling; and a snap ring having a C shape having a cutaway portion, to be fitted into said engaging groove and engaged with said inner roller and said needle bearing in an axial direction of said roller unit, said outer roller having an inner diameter of 26.4 mm or less, and said outer roller and said snap ring satisfying the formula: Do+ 2×Depth− Ds ≧ 0.1 (1) where Do is an inner diameter (mm) of said outer roller, Ds is an outer diameter (mm) of said snap ring and Depth is a groove depth (mm) of said engaging groove.