| 摘要 |
PURPOSE:To obtain the necessary strength of a supporting seat even if its material in use is decreased in thickness smaller than a conventional material, by forming plural blocks having a step differenced wall surface to the periphery of a sliding bed in the center part of the supporting seat. CONSTITUTION:A supporting seat 3, in the center part of which a disc-like sliding bed 4 supporting a rotating part of a rotary shaft body 1 is provided, is constituted such that plural blocks 13 having a circular arc shaped step differenced wall surface 5 in the internal peripheral surface are arranged with a fixed distance to the periphery of the bed 4 to both specify a position of the bed 4 and apply deformation work to protrusions 8 provided respectively onto the plural blocks 13 then the bed 4 is fixed to the seat 3. That is, the necessity for fitting the bed to a concaved part as in a conventional device can be eliminated, accordingly half drawing work is not performed to remove a small thickness part, as a result strength is increased. |
