| 摘要 |
PURPOSE: To surely prevent screw loosening between an inner cylinder and an outer cylinder by a simple and easily manufactured structure. CONSTITUTION: The male screw 2 of an end bell 1 and the female screw 6 of a ground nut 5 are engaged with each other and the male screw 7 of the ground nut 5 and the female screw 9 of an assembly nut 8 are engaged with each other. Rotational directions for both engagements are opposite from each other. The ground nut 5 is fastened to the end bell 1 in a state (a) where the assembly nut 8 is fastened to the ground nut 5 at the deepest and after this fastening is finished, the assembly nut 8 is loosened (returned) until its right end comes into contact with the flange 4 of the end belt 1. Subsequently, a fixing screw 11 attached to the assembly nut 8 is screwed into a groove 3 fully provided around the end belt 1. Then, a state (b) is reached. |
