A boot band includes a band body, which is obtained by forming a band-plate-like member into a ring shape, and a lever, which is obtained by forming a strip-like member into an arc shape, and is provided on a joined portion of the band body. The boot band fastens a boot for a constant velocity universal joint, which is arranged on an inner side of the band body, by reducing the band body in diameter such that the lever is turned over using an end portion of the lever as a fulcrum and then superposed on the band body, thereby reducing the band body in diameter. The lever includes two chamfered portions formed in a fulcrum-side region of the end portion of the lever along a thickness direction of the lever.

A transfer device is provided, which includes an input shaft configured to receive a driving force generated by a drive source, an output shaft configured to output a portion of the driving force to part-time drive wheels of a vehicle, a transfer case accommodating the input and output shafts, at least two output bearings rotatably supporting the output shaft, and a constant-velocity (CV) joint connected to the output shaft and provided on a first side of the part-time drive wheels with respect to the output shaft. The output shaft is formed with a recessed opening portion opening toward the first side and receiving at least a part of the CV joint therein. The transfer case has an annular intruding part extending from the first side of the output shaft into the recessed opening portion. A first output bearing is located inside the recessed opening portion.

A transfer device is provided, which includes an input shaft configured to receive a driving force generated by a drive source, an output shaft configured to output a portion of the driving force to part-time drive wheels of a vehicle, a transfer case accommodating the input and output shafts, at least two output bearings rotatably supporting the output shaft, and a constant-velocity (CV) joint connected to the output shaft and provided on a first side of the part-time drive wheels with respect to the output shaft. The output shaft is formed with a recessed opening portion opening toward the first side and receiving at least a part of the CV joint therein. The transfer case has an annular intruding part extending from the first side of the output shaft into the recessed opening portion. A first output bearing is located inside the recessed opening portion.

Provided is a fixed type constant velocity universal joint, including: an outer joint member (10) having a cup-shape; and an inner joint member (20), which is received in the outer joint member (10), and is configured to transmit torque between the inner joint member (20) and the outer joint member (10) through intermediation of balls (30) while allowing angular displacement. The fixed type constant velocity universal joint has a shaft (50) extending from the inner joint member (20). The shaft (50) includes a large-diameter portion (51), which is formed integrally with the shaft (50), and interferes with the balls (30) when the shaft (50) forms an operating angle, which is larger than a maximum operating angle, with respect to the outer joint member (10).

Provided is a fixed type constant velocity universal joint, including: an outer joint member (10) having a cup-shape; and an inner joint member (20), which is received in the outer joint member (10), and is configured to transmit torque between the inner joint member (20) and the outer joint member (10) through intermediation of balls (30) while allowing angular displacement. The fixed type constant velocity universal joint has a shaft (50) extending from the inner joint member (20). The shaft (50) includes a large-diameter portion (51), which is formed integrally with the shaft (50), and interferes with the balls (30) when the shaft (50) forms an operating angle, which is larger than a maximum operating angle, with respect to the outer joint member (10).

A constant-velocity joint for torque-transmission, in which a first type of track pairs of ball tracks is configured in such a manner that the centers of curvature of the center lines of the ball tracks are situated in the joint center plane when the joint is straight. A second type of track pairs of ball tracks is configured in such a manner that their center lines have at least two portions. The respective center line of the outer ball tracks of the second type of track pairs has at least one inner portion and one outer portion, wherein the inner portion is situated on the connection side of the outer joint portion, while the outer portion is situated on the opening side of the outer joint portion, and the inner portion is curved.

A constant-velocity joint for torque-transmission, in which a first type of track pairs of ball tracks is configured in such a manner that the centers of curvature of the center lines of the ball tracks are situated in the joint center plane when the joint is straight. A second type of track pairs of ball tracks is configured in such a manner that their center lines have at least two portions. The respective center line of the outer ball tracks of the second type of track pairs has at least one inner portion and one outer portion, wherein the inner portion is situated on the connection side of the outer joint portion, while the outer portion is situated on the opening side of the outer joint portion, and the inner portion is curved.

A joint assembly comprising a hollow outer joint member including a wall forming an open end and a closed end, the outer joint member having a plurality of tracks in its inner surface. An inner joint member received in the outer joint member and plurality of torque-transmitting elements, whereby the plurality of torque-transmitting elements rotationally engage with the inner joint member and the tracks of the outer joint member. Each track comprises two opposing side walls and a torque-transmitting element engages these side walls of the outer joint member and is configured to move in an axial direction along the side walls. Furthermore, a boot covering the open end of the outer joint member and at least one restrictor configured to engage at least one of the plurality of torque-transmitting elements to militate against undesired displacement of the inner joint member with respect to the outer joint member.

A joint assembly comprising a hollow outer joint member including a wall forming an open end and a closed end, the outer joint member having a plurality of tracks in its inner surface. An inner joint member received in the outer joint member and plurality of torque-transmitting elements, whereby the plurality of torque-transmitting elements rotationally engage with the inner joint member and the tracks of the outer joint member. Each track comprises two opposing side walls and a torque-transmitting element engages these side walls of the outer joint member and is configured to move in an axial direction along the side walls. Furthermore, a boot covering the open end of the outer joint member and at least one restrictor configured to engage at least one of the plurality of torque-transmitting elements to militate against undesired displacement of the inner joint member with respect to the outer joint member.

A constant velocity joint assembly includes an outer joint member defining a first longitudinal axis and including a closed end, an open end, a first set of outer tracks extending at least partially between the closed end and the open end, and a second set of outer tracks extending at least partially between the closed end and the open end. The assembly also includes an inner joint member defining a second longitudinal axis coaxial with the first longitudinal axis and including a first set of inner tracks and a second set of inner tracks, the inner joint including an attachment feature to receive a driveshaft. A path followed by the center of a ball in the first set of tracks is constrained by an outer race track path and an inner race track path, the outer race track path being a piecewise continuous function.