| 摘要 |
Provided are: a method for manufacturing a sealing device, the method being configured so that, even if the sealing device has an annular inner peripheral protrusion on the inner peripheral side thereof, the method can increase manufacturing efficiency and enables cutting-off operation with high positional accuracy; and a sealing device which has increased sliding performance and which is less likely to break. A method for manufacturing a sealing device is provided with: a step for forming a cylindrical formed body (100a) consisting of a rubber-like elastic body, the formed body (100a) having circular cylinder surfaces (130) and annular outer peripheral protrusions (110), the circular cylinder surfaces (130) and the annular outer peripheral protrusions (110) being formed and arranged alternately on the outer peripheral side of the formed body (100a), the formed body (100a) also having circular cylinder surfaces and annular inner peripheral protrusions, the circular cylindrical surfaces and the annular inner peripheral protrusions being formed and arranged alternately on the inner peripheral side of the formed body (100a), the circular cylinder surfaces on the outer peripheral side and the circular cylinder surfaces on the inner peripheral side being arranged so as to be located at the same positions in the axial direction, the outer peripheral protrusions and the inner peripheral protrusions being arranged so as to be located at the same positions in the axial direction; and a cutting step for cutting off the formed body (100a) at each of the circular cylinder surfaces (130) on the outer peripheral side. |
