Patent ID: 8267802
Filing Date: 2012-09-18
Classification: F16D

Abstract:
1. A fixed type constant velocity universal joint, comprising: an outer joint member having an inner surface in which a plurality of guide grooves are formed; an inner joint member having an outer surface in which a plurality of guide grooves are formed; a plurality of balls interposed between the plurality of guide grooves of the outer joint member and the plurality of guide grooves of the inner joint member, for transmitting torque; and a retainer for retaining the plurality of balls, wherein a center of curvature of each of the plurality of guide grooves of the outer joint member and a center of curvature of each of the plurality of guide grooves of the inner joint member are offset to opposite sides of a joint center along a central axis of the fixed type constant velocity universal joint by equal distances, the center of curvature of each of the plurality of guide grooves of the outer joint member being offset from and on a same side of the joint center as a spherical surface center of an outer surface of the retainer, and the center of curvature of each of the plurality of guide grooves of the inner joint member being offset from and on a same side of the joint center as a spherical surface center of an inner surface of the retainer, wherein R wherein As representing αt/α falls within a range of 0.45≦As≦0.65,