| 摘要 |
PURPOSE: A structure for mounting a roller of a rotating ring is provided to minimize the wear of supporting components and the occurrence of noise by restraining the friction between a ceramic roller and the supporting components. CONSTITUTION: A roller(12) has a support hole(12b) at the center. A bush(14) having a rotation support hole(14b) at the center rotates with the roller by being inserted into the support hole of the roller. A washer(16) is fitted in one side of the bush combined with the roller. A pin fixed in a rotating ring is inserted into the rotation support hole of the bush to rotatably support the bush. A fitting groove(12a) is formed in the support hole of the roller and a fitting protrusion(14a) combined to the fitting groove is formed on the circumference of the bush. The fitting groove and the fitting protrusion rotate by matching with each other. Therefore, the friction of the roller made of ceramic having high frictional coefficient and the roller is removed and the wear and noise due to friction are restrained.
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