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    • 3. 发明专利
    • Fixed type constant velocity universal joint
    • JP5340548B2
    • 2013-11-13
    • JP2007033832
    • 2007-02-14
    • Ntn株式会社
    • 智茂 小林輝明 藤尾友明 兼子
    • F16D3/2245
    • PROBLEM TO BE SOLVED: To improve torque transmission efficiency without largely changing the structure of a joint. SOLUTION: This fixed type constant velocity universal joint is provided with: an outer ring 12 having a plurality of axially-extending track grooves 11 formed on an inner spherical surface 10; an inner ring 15 having an axially-extending track grooves 14 formed on an outer spherical surface 13 by forming pairs with the track grooves 11 of the outer ring 12; a plurality of balls 16 transmitting torque by being interlaid between the track grooves 11 and 14 of the outer ring 12 and the inner ring 15; and cages 17 holding the balls 16 by being interlaid between the inner spherical surface 10 of the outer ring 12 and the outer spherical surface 13 of the inner ring 15. The centers of curvature of the track grooves 11 and 14 of the outer ring 12 and the inner ring 15 are oppositely offset in the axial direction by an equal distance with respect to the joint center; and a PCD gap 2×m in a ball track formed by the track grooves 11 and 14 of the outer ring 12 and the inner ring 15, a spherical surface gap 2×n 1 between the outer spherical surface 13 of the inner ring 15 and the inner spherical surface 19 of the cage 17, and a spherical surface gap 2×n 2 between the outer spherical surface 18 of the cage 17 and the inner spherical surface 10 of the outer ring 12, are set not smaller than 25 μm, not smaller than 40 μm, and not smaller than 40 μm, respectively. COPYRIGHT: (C)2008,JPO&INPIT