Patent ID: 9464674
Filing Date: 2016-10-11
CPC Classification: F16D,Y10S

Claim Text:
1. A fixed type constant velocity universal joint, comprising: an outer joint member having a spherical inner peripheral surface in which a plurality of track grooves are formed so as to extend in an axial direction of the outer joint member, an inner joint member having a spherical outer peripheral surface in which a plurality of track grooves are formed so as to be paired with the plurality of track grooves of the outer joint member; a plurality of balls for transmitting torque, a cage comprising pockets for holding the plurality of balls, wherein the plurality of track grooves of the outer joint member comprise: wherein the first track groove portions each have an arc-shaped 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 each of the first track groove portions has a plane comprising at least the arc-shaped ball raceway center line of the respective first track groove portion and the joint center that is inclined with respect to a joint axial line, and the planes of adjacent pairs of the first track groove portions in a peripheral direction of the outer joint member are inclined in opposite, wherein the second track groove portions each have an arc-shaped ball raceway center line having a curvature center that is offset to a radially outer side with respect to the arc-shaped ball raceway center line of a corresponding one of the first track groove portions, wherein an end portion of the arc-shaped ball raceway center line of each of the first track groove portions is positioned on the opening side with respect to the joint center, wherein a position of the end portion occupies at least 60% of an effective track length on the opening side with respect to the joint center, wherein the arc-shaped ball raceway center line of each of the second track groove portions is connected to the end portion of the arc-shaped ball raceway center line of the corresponding one of the first track groove portions, and wherein a ball raceway center line of each of the plurality of track grooves of the inner joint member is formed so as to be mirror-image symmetrical with a ball raceway center line of a corresponding one of the plurality of track grooves of the outer joint member with respect to another plane comprising the joint center at an operating angle of 0°.