Ntn Corporation

Naohiro Une

Tatsuhiro Goto

Katsuhiro Suzuki

Tatsuro Sugiyama

Hisaaki Kura

Shin Tomogami

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.

Plunging type constant velocity universal joint

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. A circumferential arrangement of the ball tracks is made with a uniform pitch, and the circumferential length of the pockets of the cage is made uneven at least at one location.

Plunging constant velocity universal joint

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. A circumferential arrangement of the ball tracks is made with a uniform pitch, and a circumferential arrangement of the pockets of the cage is made with a random and non-uniform pitch of 55&#xb0; or more.

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Shizuoka-ken, Japan

Naohiro Une