Sealing apparatus

Abstract

Provided is a sealing apparatus 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 being applied. A seal ring () inclines when subjected to a hydraulic pressure (P) and a pressing force by a D-ring (), and stabilizes in a state where an entire opposite pressure-side taper surface () is in contact with an opposite pressure-side side surface () of an annular groove for sealing (). With the hydraulic pressure (P) being applied to a portion () of the inner peripheral surface () of the seal ring () where an operating oil comes into contact, a space between the portion () and a shaft () is enlarged, and an area of contact between the seal ring () and the shaft () is reduced. Thus, the torque can be reduced. Furthermore, since the outer peripheral surface () of the D-ring () is a surface having a cylindrical shape, the operating oil is not allowed to enter between the D-ring () and a bottom surface () of the annular groove for sealing () even when the hydraulic pressure (P) is being applied, and the entirety of the outer peripheral surface () of the D-ring () always remains in contact with the bottom surface () of the annular groove for sealing (). Thus, the sealing device always exhibits a stable sealing performance.