| 摘要 |
PURPOSE:To lengthen the endurance life of a joint by rotating a cylindrical roller being loosely fit in the inside diameter by rolling of a spherical roller, bringing the end surface of a needle roller of the inner wall thereof into contact with a slip-off preventing ring be centrifugal force, and restoring generated skew by frictional force generated at the contact portion. CONSTITUTION:In the case where the end surface 21 of a needle roller 2 is brought into a slip-off preventing ring 3 by centrifugal force or the like, when a spherical roller R rolls along a recessed track 4, the roller R and E are rotated in a body because the frictional force of the fitting surface between the roller R and the cylindrical roller E is larger than that of the fitting surface of the roller E and a roller 2. On the other hand, when the roller E is brought into contact with the ring 3 by the axial sliding force from the roller R, the ring 3 also rotates. At this time, the rotating speed of the ring 3 becomes almost equal to the rotating speed of the roller E to be higher than the revolving speed of the roller 2, so that the frictional force generated at the contact portion of the end surface 21 and the ring 3 causes the end surface 21 to precede in the revolving direction of the roller 2 to immediately restore skew of the roller 2. |
