| 摘要 |
PROBLEM TO BE SOLVED: To easily form an annular void, and to increase the shaft tightening force by inserting a tightening ring inn the annular void of a cylindrical part to pass the shaft into a body to be tightened, and providing a separate cylindrical part on the inner circumferential side of the annular void from the body to be tightened. SOLUTION: An annular void 13 is formed on each side of a cylindrical main body, its inner circumferential side is a cylindrical part 11, its outer circumferential surface of the cylindrical part 11 is a tapered surface 12 with the diameter reduced toward each end side, and its inner circumferential wall outside the annular void 13 is a tapered surface 14. An inner circumferential surface of a tightening ring 2 to be stored in the annular void 13 is a tapered surface coincident with the tapered surfaces 12, 14. A plurality of through holes 15 are provided with the prescribed pitches on a bulkhead 16 between the annular voids 13, and a through hole 21 and a screw hole 22 are formed in one tightening ring 2 and in the other one, respectively. In the cylindrical part 11, the part of the cylindrical part 11 is separated from the bulkhead 16, and parallel cylindrical parts 111 of the cylindrical part 11 are densely fitted in parallel hole parts 161 of the bulkhead 16. When the tightening ring 2 is tightened in the axial direction, the diameter of the cylindrical part 11 is easily reduced, and the shaft tightening force by a tightening bolt 3 is increased. |
