| 摘要 |
<P>PROBLEM TO BE SOLVED: To prevent enlargement of an inner diameter of a backup ring attached to an O-ring groove over a standard size, and to stably attach the backup ring. <P>SOLUTION: The sealing device is provided with the recessed O-ring groove 11, the endless backup ring 100 made of fluororesin attached to the O-ring groove 11, and an O-ring 14 superposed on the backup ring 100. The inner diameter do of the backup ring 100 before attachment is formed smaller than a groove inner diameter Do of the O-ring groove 11, and at attachment, the backup ring is radially expanded to be inserted in the O-ring groove 11, and its inner diameter face 100a is abutted on a bottom wall part 11a. <P>COPYRIGHT: (C)2007,JPO&INPIT |
