Patent ID: 7708644
Filing Date: 2010-05-04
Classification: F16D,Y10S

Abstract:
1. A tripod constant velocity universal joint comprising: an outer joint member having three, circumferentially equispaced, axially extending track grooves formed in an inner circumference thereof, the outer joint member being connected to a first rotary shaft for transmission of torque; an inner joint member having a boss connected to a second rotary shaft for transmission of torque and three circumferentially equispaced journals each radially protruding from the boss, each journal being connected to the boss at a journal bottom part; and a roller cassette interposed between the outer joint member and the inner joint member for transmission of torque, wherein the journal bottom part of at least one journal comprises a concavely curved portion such that a first radius of curvature of the concavely curved portion of the journal bottom part as viewed in a plane perpendicular to an axis of the joint is larger than a second radius of curvature of the concavely curved portion of the journal bottom part as viewed in a plane parallel to the axis of the joint and an axis of the at least one journal, and wherein a radius of curvature of the concavely curved portion of the journal bottom part gradually decreases from the first radius of curvature down to the second radius of curvature.