| 摘要 |
PURPOSE:To improve a working property without entailing any damage to sealability in a cylindrical mounting part by forming a cavity part on an outer circumferential surface of the cylindrical mounting part at one side edge of a bellows and a ring protuberance on the inner circumferential surface, respectively, while making up a ring recess groove in this cavity part. CONSTITUTION:Although a ring protuberance is formed on an inner circumferential surface of a cylindrical mounting part 3 of a bellows 1, a ring recess groove 5 is formed in a cavity part 4 of the mounting part 3 at a part corresponding to the ring protuberance, so that when the cylindrical mounting part 3 is inserted into an installing part 13 of the bellows 1, the ring recess groove 5 is widened from the outside, whereby the ring protuberance on the inner circumferential surface is absorbed to the side of the ring recess groove 5, and the inner circumferential surface of the cylindrical mounting part 3 is made into a smoothing surface, thus it can be smoothly inserted thereinto. After the insertion, when a flat belt 14 is rolled in the cavity part 4 and tightened, almost the whole surface of the cylindrical mounting part 3 is uniformly clamped, while the ring protuberance on the inner circumferential surface is extruded in direction being projected to the inside, so that high sealability to the bellows installing part 13 of the cylindrical mounting part 3 can be thus held. |
