Patent ID: 8079600

Claim:
A sealing structure comprising a seal ring made of a rubber-like elastic material and said seal ring being installed in a dovetail groove, said dovetail groove including a first inner surface at one side of the dovetail groove, the first inner surface being inclined to extend toward an inside of the dovetail groove and a second inner surface of the dovetail groove being located opposite to the first inner surface, the first inner surface of the dovetail groove and the second inner surface of the dovetail groove extending from a flat bottom surface of the dovetail groove, the second inner surface of the dovetail groove extending perpendicular to the flat bottom surface of the dovetail groove, and the seal ring including, at an insertion section to be inserted into the dovetail groove, a side projection surface coming into close contact with the first inner surface, a bottom surface coming into close contact with the flat bottom surface of the dovetail groove and the seal ring having a width (W 3 ) less than a groove width (W 1 ) between groove shoulders of the dovetail groove and a side upward-facing inclined surface of the seal ring coming into close contact with the second inner surface at the opposite side to the first inner surface, a projection section of the seal ring being located between a flat bottom surface of the seal ring and the side upward-facing inclined surface of the seal ring, the projection section of the seal ring being configured to initially contact the second inner surface of the dovetail groove during insertion of the seal ring into the dovetail groove.