Sealing apparatus for high-pressure tank and high-pressure tank comprising same

A high-pressure tank for storing a gaseous fuel of a vehicle, comprising:

• a liner formed of a hollow cylinder and configured to accommodate a high-pressure fluid;
• a connection boss provided at an inlet of the liner and made of metal, comprising a first connection boss part coupled to an inner surface of the inlet and a second connection boss part coupled to an outer surface of the inlet and having a tapered shape with a relative narrow upper side and a relatively wide lower side, the second connection boss part having an outer tilted surface;
• and
• a coupling member, configured to come into surface contact with an outer tilted surface of the second connection boss part and having an inner tilted surface corresponding to a shape of the outer tilted surface of the second connection boss part so that a diameter of a lower side of the tilted inner surface is larger than a diameter of an upper side of the tilted inner surface,
• wherein the inner tilted surface of the coupling member comes into surface contact with and is coupled to the outer tilted surface of the second connection boss part without a mechanical combination,
• wherein the upper side indicates a direction toward the inlet and the lower side indicates a direction toward a bottom surface with respect to a central part of the high-pressure tank.