| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a sealing device which is small in the number of part items, concretely, whose number of part items is three or less, and which can be thereby made compact in size, has protrusion resistance, and can lower slide resistance.SOLUTION: A sealing device is composed of a combination of an inner seal ring, an outer seal ring which is held at a holding groove formed at an external peripheral face of the inner seal ring, and slidably contacts with an opposing face, and a back ring which is arranged at an internal peripheral side of the inner seal ring. The inner seal ring is formed of a material which is higher than the outer seal ring in rigidity, and has a cut part at one point on a circumference. The outer seal ring is formed of a material which is lower than the inner seal ring in friction and rigidity, and formed into an endless shape. The back ring is formed of a material which is higher than the outer seal ring and the inner seal ring in elasticity, and has elasticity for pressing the outer seal ring to the opposing face via the inner seal ring.</p> |
