Sealing structure

A sealing structure comprising:

• an outer peripheral member;
• an inner peripheral member which is installed to the outer peripheral member in an inserting state;
• a seal ring which stands between the outer peripheral member and the inner peripheral member;
• a taper-like outer peripheral surface which is smaller in its diameter toward an inserting direction of the inner peripheral member;
• an installation portion outer peripheral surface which extends from the small diameter end portion toward said inserting direction;
• the taper-like outer peripheral surface and the installation portion outer peripheral surface being formed on an outer peripheral surface of said inner peripheral member;
• a stepped surface which is positioned closer to said inserting direction side than said taper-like outer peripheral surface and is directed to an opposite direction to the inserting direction;
• an installation portion inner peripheral surface which extends from an outer diameter end of the stepped surface in the opposite direction to the inserting direction;
• and
• the stepped surface and the installation portion inner peripheral surface being formed on an inner peripheral surface of said outer peripheral member,
• wherein said seal ring is arranged in a compressed state between said taper-like outer peripheral surface and the installation portion outer peripheral surface, and said stepped surface and the installation portion inner peripheral surface;
• wherein a second taper-like outer peripheral surface is formed on the outer peripheral surface of the inner peripheral member, and the second taper-like outer peripheral surface is positioned closer to the opposite direction side to the inserting direction than the taper-like outer peripheral surface and has an outer diameter which is equal to or more than a large diameter end portion of said taper-like outer peripheral surface and is larger toward the opposite direction to the inserting direction;
• wherein a cylindrical surface is formed on the outer peripheral surface of the inner peripheral member between the taper-like outer peripheral surface and the second taper-like outer peripheral surface;
• wherein, in an uninstalled state, the seal ring has a rectangular cross-sectional shape;
• and
• wherein, in an installed state, the seal ring includes:
• an end surface outer diameter portion in close contact with the stepped surface;
• an inner peripheral surface in close contact with the installation portion outer peripheral surface;
• an inner peripheral surface in close contact with the taper-like outer peripheral surface;
• an inner peripheral surface in close contact with a second outer peripheral surface formed on the outer peripheral surface of the inner peripheral member;
• an end surface inner diameter portion in close contact with the second taper-like outer peripheral surface;
• and
• an outer peripheral surface in close contact with the installation portion inner peripheral surface and the second taper-like inner peripheral surface.