Patent ID: 8979659
Filing Date: 2015-03-17
Classification: F16D,Y10S

Abstract:
1. A fixed type constant velocity universal joint, comprising: an outer joint member having an inner surface including eight track grooves; an inner joint member having an outer surface including eight track grooves; eight torque transmitting balls arranged in ball tracks formed of pairs of the eight track grooves of the outer joint member and the eight track grooves of the inner joint member, respectively; and a cage which is interposed between the inner surface of the outer joint member and the outer surface of the inner joint member and holds the eight torque transmitting balls, wherein bottom surfaces of all of the eight track grooves of the outer joint member and bottom surfaces of all of the eight track grooves of the inner joint member each have a circular-arc portion, wherein an outer spherical surface of the cage and the inner surface of the outer joint member are brought into contact with each other, wherein an inner spherical surface of the cage and the outer surface of the inner joint member are brought into contact with each other, wherein a center of curvature of each of the eight track grooves of the outer joint member and a center of curvature of each of the eight track grooves of the inner joint member have an amount of displacement of zero, the amount of displacement being defined in a joint axis direction relative to a joint center, and wherein the eight track grooves of each of the outer joint member and the inner joint member comprise: