| 摘要 |
To increase a torque transmission efficiency without involving significant modification of a structure of a joint. A fixed type constant velocity universal joint includes: an outer joint member (12) having an inner spherical surface (10) in which a plurality of track grooves (11) extending in an axial direction are formed; an inner joint member (15) having an outer spherical surface (13) in which a plurality of track grooves (14) extending in the axial direction while paired with the track grooves (11) of the outer joint member (12) are formed; a plurality of balls (16) interposed between the track grooves (11, 14) of each of the outer joint member (12) and the inner joint member (15), for transmitting a torque; and a cage (17) interposed between the inner spherical surface (10) of the outer joint member (12) and the outer spherical surface (13) of the inner joint member (15), for holding the balls (16), the outer joint member (12) and the inner joint member (15) each having a center curvature of the track grooves (11, 14) being offset from each other in a direction opposite to the axial direction by an equal distance with respect to a joint center, in which: a PCD gap (2×m) in a ball track formed between the track grooves (11, 14) of each of the outer joint member (12) and the inner joint member (15) is set to equal to or larger than 25μm; a spherical surface gap (2×n1) formed between the outer spherical surface (13) of the inner joint member (15) and an inner spherical surface (19) of the cage (17) is set to equal to or larger than 40μm; and a spherical surface gap (2×n2) formed between an outer spherical surface (18) of the cage (17) and the inner spherical surface (10) of the outer joint member (12) is set to equal to or larger than 40μm.
|
