Patent ID: 7371179
Filing Date: 2008-05-13
Classification: F16C,F16D,Y10S

Abstract:
1. A tripod constant-velocity universal joint comprising: an outer housing including a plurality of guide grooves defined in an inner circumferential surface thereof; a spider inserted in said outer housing, the spider including three trunnions projecting radially outwardly from said spider; and a plurality of rollers, wherein each roller includes a plurality of rolling elements and is rotatably mounted on a corresponding trunnion, said rollers being rotatably and slidably provided against guide surfaces of said guide grooves, wherein said rolling elements have flat surfaces on end faces thereof and one of said rolling elements is radially movable and all remaining rolling elements are assembled on and are held in contact with inner circumferential surfaces of said rollers, each of said rollers having flanges disposed on respective ends thereof, and wherein when the radially movable rolling element moves between zero to a maximum offset in a radial direction represented by a distance X, a ratio W/Dn is maintained in a range of 0% to 30%, wherein W is a contact surface between said flat surface of said rolling side surface and said inner side surface of said flanges, and Dn is a diameter of said flanges.