Abstract: A plunging type constant velocity universal joint includes an inner joint member having an outer peripheral surface in which a plurality of linear track grooves are formed in an axial direction and inclined with respect to an axial line, an outer joint member having an inner peripheral surface in which a plurality of linear track grooves are formed in the axial direction and inclined with respect to the axial line in a direction opposite to that of the track grooves of the inner joint member, and having an inside filled with a lubricant, balls incorporated in respective crossing portions between the track grooves of the inner and outer joint members, and a cage arranged between the outer peripheral surface and the inner peripheral surface for retaining the balls in the same plane, in which a large number of minute recesses are formed at random in surfaces of the balls.

Abstract: Unpleasant vibration and muffled sound are restrained. A constant velocity universal joint includes an outer joint part having a plurality of track grooves formed on its cylindrical inner circumferential surface and extending in an axial direction, an inner joint part having a plurality of track grooves formed on its spherical outer circumferential surface and extending in the axial direction, six torque transmitting balls, each being put in a ball track formed by a pair of the track groove of the outer joint part and the track groove of the inner joint part, and a cage having pockets for retaining the torque transmitting balls. The center of curvatures of the spherical outer circumferential surface and the center of the spherical inner circumferential surface of the cage are offset by the same distance in the opposite directions along the axis about the center of the joint.

Abstract: Unpleasant vibration and muffled sound are restrained. A constant velocity universal joint includes an outer joint part having a plurality of track grooves formed on its cylindrical inner circumferential surface and extending in an axial direction, an inner joint part having a plurality of track grooves formed on its spherical outer circumferential surface and extending in the axial direction, six torque transmitting balls, each being put in a ball track formed by a pair of the track groove of the outer joint part and the track groove of the inner joint part, and a cage having pockets for retaining the torque transmitting balls. The center of curvatures of the spherical outer circumferential surface and the center of the spherical inner circumferential surface of the cage are offset by the same distance in the opposite directions along the axis about the center of the joint.

Abstract: Unpleasant vibration and muffled sound are restrained. A constant velocity universal joint includes an outer joint part having a plurality of track grooves formed on its cylindrical inner circumferential surface and extending in an axial direction, an inner joint part having a plurality of track grooves formed on its spherical outer circumferential surface and extending in the axial direction, six torque transmitting balls, each being put in a ball track formed by a pair of the track groove of the outer joint part and the track groove of the inner joint part, and a cage having pockets for retaining the torque transmitting balls. The center of curvatures of the spherical outer circumferential surface and the center of the spherical inner circumferential surface of the cage are offset by the same distance in the opposite directions along the axis about the center of the joint.

Abstract: To easily achieve reduction in weight and size and increase in durability even when contact force at contact portions with respect to balls increases.

Abstract: The object is to reduce the weight of the outer race of cross groove constant velocity universal joints. The cross groove constant velocity universal joint includes a disc-shaped outer race (10) having ball tracks (14) in the outer race inner circumferential surface (12), an inner race (20) having ball tracks (24) in the inner race outer circumferential surface (22), balls (30) set between the pairs of the ball tracks (14) of the outer race (10) and the ball tracks (24) of the inner race (20), and a cage (40) that retains all the balls (30) within the same plane. Bolt holes (16) are arranged between adjacent ball tracks (14) of the outer race (10), and the outer circumference of the outer race (10) is cut out as denoted at the reference numeral 18 between adjacent bolt holes (16) so that the outer race (10) has a corolla-shaped outer contour.

Abstract: A constant velocity universal joint includes: an outer joint part 10 having a plurality of track grooves 14 formed on its cylindrical inner circumferential surface 12 and extending in an axial direction; an inner joint part 20 having a plurality of track grooves 24 formed on its spherical outer circumferential surface 22 and extending in the axial direction; six torque transmitting balls 30, each being put in a ball track formed by a pair of the track groove 14 of the outer joint part 10 and the track groove 24 of the inner joint part 20; and a cage 40 having pockets 46 for retaining the torque transmitting balls 30. The center Oo of curvatures of the spherical outer circumferential surface 42 and the center Oi of the spherical inner circumferential surface 44 of the cage 40 are offset by the same distance in the opposite directions along the axis about the center of the joint O.

Abstract: A cross groove constant velocity universal joint of which weight of the outer ring is reduced. The cross groove constant velocity universal joint includes a disc-shaped outer ring having ball tracks in the inner circumferential surface, an inner ring having ball tracks in the outer circumferential surface, balls set between the pairs of the outer ring ball tracks and the inner ring ball tracks, and a cage that retains all the balls within the same plane. Bolt holes are arranged between adjacent ball tracks of the outer ring, and recesses are formed such as to reduce the outside diameter of the outer ring except for both axial ends, at least between adjacent bolt holes.