A transfer device of a vehicle is provided, in which an auxiliary-drive-wheel output shaft extending in parallel with a main-drive-wheel output shaft is connected to a propeller shaft having a universal joint. An end part of the auxiliary-drive-wheel output shaft on a propeller shaft side is formed in a hollow shape and includes a fitting part configured to be spline-engaged with a joint part provided to the universal joint. The joint part is provided with a centering part which is inserted into a centering hole formed in a flange part provided to one side of the auxiliary-drive-wheel output shaft so that the joint part is centered on the auxiliary-drive-wheel output shaft. The flange part is sandwiched between a spacer and the joint part, and a bolt member is attached to a bolt hole formed in the centering part so that the propeller shaft is assembled to the auxiliary-drive-wheel output shaft.

A plunging type constant velocity universal joint 1 for a propeller shaft includes an outer joint member 2, an inner joint member 3, eight torque transmitting balls 4, and a cage 5. A center of curvature O1 of a spherical outer surface 12 and a center of curvature O2 of a spherical inner surface 13 of the cage 5 each have an equal and axially opposite offset (f) with respect to a center O3 of pockets 5a. A ratio f/PCD.sub.BALL between the offset (f) of the cage 5 and a pitch circle diameter (PCD.sub.BALL) of the torque transmitting balls 4 is 0.07 or more and 0.09 or less.

A plunging type constant velocity universal joint 1 for a propeller shaft includes an outer joint member 2, an inner joint member 3, eight torque transmitting balls 4, and a cage 5. A center of curvature O1 of a spherical outer surface 12 and a center of curvature O2 of a spherical inner surface 13 of the cage 5 each have an equal and axially opposite offset (f) with respect to a center O3 of pockets 5a. A ratio f/PCD.sub.BALL between the offset (f) of the cage 5 and a pitch circle diameter (PCD.sub.BALL) of the torque transmitting balls 4 is 0.07 or more and 0.09 or less.

A type of constant velocity universal joint has the spline slip structure, including the steel wire retaining ring and the star-shaped sleeve which are both mounted on a common axis, and the steel wire retaining ring limiting device. The said steel wire retaining ring limiting device is a groove arranged on the said star-shaped sleeve and used for holding the said steel wire retaining ring. The said steel wire retaining ring may be elliptic or circular. The movement in the radial direction of the steel wire retaining ring will be limited by the groove on the star shaped sleeve and there occurs a certain contraction, in addition to appropriate the chamfer angle of the groove, when removing the spline shaft from the star-shaped sleeve.

A type of constant velocity universal joint has the spline slip structure, including the steel wire retaining ring and the star-shaped sleeve which are both mounted on a common axis, and the steel wire retaining ring limiting device. The said steel wire retaining ring limiting device is a groove arranged on the said star-shaped sleeve and used for holding the said steel wire retaining ring. The said steel wire retaining ring may be elliptic or circular. The movement in the radial direction of the steel wire retaining ring will be limited by the groove on the star shaped sleeve and there occurs a certain contraction, in addition to appropriate the chamfer angle of the groove, when removing the spline shaft from the star-shaped sleeve.

In a fixed type constant velocity universal joint, an axial offset amount of a curvature center of each of track grooves of outer and inner joint members is set to 0. The track grooves of the outer and inner joint members are each inclined with respect to an axis line. The track grooves adjacent to each other in a circumferential direction are inclined in opposite directions. The track grooves of the outer and inner joint members that are opposed to each other are inclined with respect to the axis line in opposite directions. A chamfered portion is formed on a track inlet end of each of the track grooves of the outer joint member. When the cage and the inner joint member are inclined with respect to the outer joint member, balls are incorporated into two cage windows at the same time through the chamfered portions.

In a fixed type constant velocity universal joint, an axial offset amount of a curvature center of each of track grooves of outer and inner joint members is set to 0. The track grooves of the outer and inner joint members are each inclined with respect to an axis line. The track grooves adjacent to each other in a circumferential direction are inclined in opposite directions. The track grooves of the outer and inner joint members that are opposed to each other are inclined with respect to the axis line in opposite directions. A chamfered portion is formed on a track inlet end of each of the track grooves of the outer joint member. When the cage and the inner joint member are inclined with respect to the outer joint member, balls are incorporated into two cage windows at the same time through the chamfered portions.

A plunging type constant velocity universal joint 1 for a propeller shaft includes an outer joint member 2, an inner joint member 3, eight torque transmitting balls 4, and a cage 5. A center of curvature O1 of a spherical outer surface 12 and a center of curvature O2 of a spherical inner surface 13 of the cage 5 each have an equal and axially opposite offset (f) with respect to a center O3 of pockets 5a. A ratio f/PCD.sub.BALL between the offset (f) of the cage 5 and a pitch circle diameter (PCD.sub.BALL) of the torque transmitting balls 4 is 0.07 or more and 0.09 or less.

A plunging type constant velocity universal joint 1 for a propeller shaft includes an outer joint member 2, an inner joint member 3, eight torque transmitting balls 4, and a cage 5. A center of curvature O1 of a spherical outer surface 12 and a center of curvature O2 of a spherical inner surface 13 of the cage 5 each have an equal and axially opposite offset (f) with respect to a center O3 of pockets 5a. A ratio f/PCD.sub.BALL between the offset (f) of the cage 5 and a pitch circle diameter (PCD.sub.BALL) of the torque transmitting balls 4 is 0.07 or more and 0.09 or less.

A constant velocity universal joint includes an outer joint member and an inner joint member between which torque is transferred through intermediation of balls while allowing angular displacement. A power transmission shaft is coupled to the inner joint member to allow torque transmission therebetween. A mounting and dismounting mechanism configured to mount and dismount the power transmission shaft to and from the inner joint member is provided between the inner joint member and the power transmission shaft. The mounting and dismounting mechanism includes a tubular member, a snap ring mounted inside the tubular member, a pushing member arranged on a radially outer side of the snap ring to be movable in a radial direction, and an annular member arranged on an outer peripheral surface of the tubular member to be movable in an axial direction.