Fuel tank opening and closing device

An open-close device for fuel tank configured to open and close a fuel passage for supplying a fuel discharged from a refueling nozzle to a fuel tank, the open-close device comprising:

• a tubular body having a tube main body configured to form the fuel passage;
• a valve support member having:
• a valve support main body in a cylindrical shape to be inserted into the tube main body;
• and a filler port configured to define part of the fuel passage;
• and
• a flap valve mechanism having:
• an open-close member pressed by an edge of the refueling nozzle to open the filler port;
• a shaft support mechanism provided on the open-close member and the valve support member to support the open-close member in a rotatable manner;
• a spring arranged to press the open-close member in a closing direction;
• and a gasket configured to seal between an opening periphery of the filler port and the open-close member, wherein
• the shaft support mechanism comprises:
• a shaft member formed on one end of the open-close member;
• a bearing member having a shaft support hole, in which the shaft member is supported in a rotatable manner relative to the valve support member;
• and a rotation restricting mechanism configured to restrict rotation of the shaft member supported in the shaft support hole, wherein
• the bearing member is configured to support the shaft member to be movable in the shaft support hole between a first position where the open-close member warps the gasket and a second position where the open-close member does not warp the gasket, and
• the rotation restricting mechanism comprises:
• a restricting element provided on the opening periphery of the filler port;
• and a restricted element provided on the shaft member to be engaged with the restricting element, wherein
• at the first position, the restricting element is engaged with the restricted element to restrict rotation of the shaft member, so that the open-close member is moved in a direction of warping the gasket, while maintaining an attitude substantially parallel to a plane where the gasket is placed, and
• at the second position, the restricting element is disengaged from the restricted element, so that the open-close member is rotatable about the shaft member.