| 摘要 |
Provided is a sealing device which can reduce the torque of a rotary portion while always exhibiting a stable and high sealing performance even when a high fluid pressure is applied to the sealing device. A seal ring (4) is inclined when receiving a hydraulic pressure (P) and a pressing force applied by a D-ring (3), and is stabilized in a state that the entirety of an opposite pressure-side taper surface (4c) is in contact with an opposite pressure-side side surface (5b) of an annular groove (5) for sealing. The hydraulic pressure (P) is applied to a portion (4b1) of the inner peripheral surface (4b) of the seal ring (4), with which operating oil is brought into contact, so that a space between the portion (4b1) and a shaft (2) is enlarged, and the contact area between the seal ring (4) and the shaft (2) is reduced. Thus, the torque can be reduced. Furthermore, the outer peripheral surface (3a) of the D-ring (3) has a cylindrical shape, so that there is no space to which the operating oil is introduced, between the D-ring (3) and a bottom surface (5a) of the annular groove (5) for sealing even when the hydraulic pressure (P) is applied, and the contact between the entirety of the outer peripheral surface (3a) of the D-ring (3) and the bottom surface (5a) of the annular groove (5) for sealing is always maintained. Thus, the sealing device always exhibits a stable sealing performance. |
