| 摘要 |
PROBLEM TO BE SOLVED: To set a large operating angle and suppress chipping of a track edge portion by retarding derailment of a contact ellipse of a ball from a track groove during torque loading. SOLUTION: A fixed constant velocity universal joint comprises an outer joint member 25 with a plurality of track grooves 23 axially formed at constant circumferential intervals on an inner spherical surface 21, an inner joint member 26 with a plurality of track grooves 24 axially formed at constant circumferential intervals on an outer spherical surface 22, a plurality of balls 28 interposed between both track grooves 24 and 23 of the inner and outer joint members 26 and 25, and a cage 29 interposed between the inner spherical surface 21 of the outer joint member 25 and the outer spherical surface 22 of the inner joint member 26; and both track grooves 24 and 23 have straight bottoms 24b and 23b parallel to the axis. A center of curvature OTO of the track grooves 23 of the outer joint member 25 and a center of curvature OTI of the track grooves 24 of the inner joint member 26 are positively offset over an axial equal distance with respect to a joint center OJ.
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