| 摘要 |
<p>An objective is to provide a sealing device that can maintain sealing properties under fluid pressure load with a simple structure even when creep occurs in a cut portion due to thermal expansion and the perimeter is shortened, and the objective is achieved by a sealing device that is formed of an annular body made of resin, the annular body placed in an annular groove formed in the outer periphery of a shaft to seal an annular gap to keep fluid from entering the annular gap, the annular gap between a housing having a shaft hole and the shaft that is inserted into the shaft hole and performs relative sliding movement with the housing, and has a cut portion on the circumference of a circle of the annular body, the sealing device including: a seal ring unit having, on the side thereof where the outer periphery is located, a sliding surface on which the seal ring unit slides on the housing; and a lip portion that is provided on the side of the seal ring unit where the inner periphery thereof is located, the lip portion whose tip is placed on the side of the annular groove where a groove bottom thereof is located, wherein the lip portion is provided in such a way that the tip thereof is deformable in a direction in which the tip increases the distance between the seal ring unit and the groove bottom of the annular groove by making contact with the groove bottom of the annular groove, under load of fluid pressure, by the fluid pressure.</p> |
