Patent ID: 9169877
Filing Date: 2015-10-27
Classification: F16D

Abstract:
1. A fixed type constant velocity universal joint, comprising: an outer joint member having: an inner joint member having a spherical outer peripheral surface provided with a plurality of track grooves that are paired with the plurality of track grooves of the outer joint member; a plurality of balls for transmitting torque, the plurality of balls being interposed between the plurality of track grooves of the outer joint member and the plurality of track grooves of the inner joint member; and a cage for holding the plurality of balls, the cage having a spherical outer peripheral surface and a spherical inner peripheral surface that are fitted respectively to the spherical inner peripheral surface of the outer joint member and the spherical outer peripheral surface of the inner joint member, wherein the plurality of track grooves of the outer joint member comprise: wherein the first track groove portions each comprise a circular-arc ball-raceway center line having a curvature center that is prevented from being offset in the axial direction with respect to a joint center, wherein planes defined in the first track groove portions that are adjacent to each other in a circumferential direction, the planes each comprising at least the circular-arc ball-raceway center line and the joint center, are inclined with respect to a joint axial line with inclination directions opposite to each other, wherein the second track groove portions each comprise a ball-raceway center line comprising a straight part configured to adjoin and thereby extend an effective track length at a maximum operating angle, wherein the circular-arc ball-raceway center line of each of the first track groove portions comprises an end portion located on the opening side with respect to the joint center, wherein the ball-raceway center line of each of the second track groove portions is connected to the end portion, and wherein the plurality of track grooves of the inner joint member each comprise a ball-raceway center line formed to be mirror-image symmetrical with a ball-raceway center line of a corresponding one of the plurality of paired track grooves of the outer joint member with respect to a plane comprising the joint center at an operating angle of 0°.