| 摘要 |
PURPOSE:To maintain sealing performance over a long period of time by constituting a sealing ring of a fixing part and an elastic extensible and contractible part, and fastening and fixing a rotary body by the extensible and contractible part in the sealing ring such as an O ring. CONSTITUTION:A cylindrical body having a thick wall shape fixing part 1a and a thin wall shape extensible and contractible part 1b is molded by silicon rubber or the like, and a sealing ring 1 is formed. Plural projecting parts 1c-1f are formed inside of it. The fixing part 1a is fitted in a groove part 2b of a bearing 2, and is installed around a rotary body 3, and is fixed by fastening the rotary body 3 by an elastic ring 4 through the thin wall shape extensible and contractible part 1b. In this way, since only the tips of the projecting parts 1c-1f are brought into contact with the rotary body 3, frictional resistance is reduced, so that smooth rotation becomes possible. Even if the rotary body 3 is made eccentric, since the extensible and contractible part 1b is fastened always by the ring 4, sealing performance can be maintained over a long period of time. |
