| 摘要 |
PURPOSE:To prevent a seal member from extruding or being nipped, by setting an angle between an inclined plane and a sliding surface to a range of 40-70 deg. as well as setting a ratio of length ranging from the sliding surface to the bottom of a seal groove and a heel part of the seal member to a range of 0.08-0.4. CONSTITUTION:A groove 1 is formed in one side of a seal member X, and a lip 2 is formed in the upper part of the groove 1, while a slope 3 is formed at the side opposite to the groove 1, and an inclined plane 4 is formed at the opposite side to the side where high pressure acts. An angle alpha made up between a sliding surface 6 and the inclined plane 4 is set to 40 deg.<alpha<70 deg., and both of length lranging from the sliding surface 6 to the bottom 8 of a seal groove Y and length (a) ranging from the sliding surface 6 to a heel part 5 of the seal member X are set to 0.08<=a/l<0.4. With this constitution, if there is no backup, extrusion and nipping in the seal member X can be prevented from occurring, thus any hindrance to functions of a sliding member 9 is preventable. |
