| 摘要 |
PURPOSE:To prevent racing of an outer ring through abrasion and creep of the ring by forming an eccentric recession on the outer ring, fitting an elastic plastic eccentric ring to it, sequentially narrowing the leading width from one end in both turning directions, and forming cutouts alternatively on inner and outer surfaces. CONSTITUTION:An outer peripheral surface 7 of an outer ring 1 is in internal contact with a circle having a center Oa and a radius Ra. An eccentric recession 9 has an eccentric center Ob and a bottom surface 10 of a radius Rb. An eccentric ring 5 to be fitted to the recession 9 has a shape similar to the depth shape of the eccentric recession 9, and is formed to be C-ring of elastic plastic material. Cutouts 11, 13 are alternatively formed in a waved manner on inner and outer surfaces so as to cause easy elastic deformation. End insertion parts 15, 17 have each a small leading width. In one end of the eccentric ring 5, space between the groove bottom surface 10 and the inner peipheral surface of a bearing box 6 is narrowed, bringing about a state where a wedge is inserted. The outer ring and the bearing box 6 are in a locked condition. Wedge function is not eliminated by abrasion of the eccentric ring or creep, so that the locked condition is successively kept. |
