| 摘要 |
PROBLEM TO BE SOLVED: To surely prevent a packing from breaking by projecting a part of the packing at a low-pressure side in a sealing device wherein a back-up ring is arranged at the low-pressure side of the packing. SOLUTION: The packing and the back-up ring 4 located at the low-pressure side rather than the packing and made of a material with rigidity higher than that of the packing are mounted in a mounting groove formed on an outer peripheral surface of an inner peripheral member 2 and continued in the circumferential direction. In the back-up ring 4, a width La in the radial direction of one side 4a facing to a packing side is greater than a height h from a groove bottom face 21c to the counter member, and one side 4a and the other side 4b is inclined in the same direction of an inside face 21b at the low-pressure side of the mounting groove at the time of a mounted state of the back-up ring 4. An angleθ<SB>1</SB>made between an inner peripheral surface 4c relatively shifted to an opposite side of the packing due to this inclination and the groove bottom face 21c brought into contact with the inner peripheral surface 4c is greater than an inclined angleθ<SB>2</SB>of the other side 4b against the inside face 21b at the low-pressure side. COPYRIGHT: (C)2009,JPO&INPIT
|
