Automatic opening and closing device for fuel inlet of vehicle

An opening and closing device for a fuel inlet of a vehicle, the opening and closing device comprising:

• a cap cover mounted at the fuel inlet of the vehicle;
• a fuel cap pivotably mounted at the cap cover and configured to selectively open or close the fuel inlet by being pivoted inside the fuel inlet;
• and
• a fuel cap operating mechanism mounted in the fuel inlet and configured, when a fuel door disposed in front of the cap cover is closed, to pivot the fuel cap by being pressed by the fuel door to close the fuel inlet, and, when the fuel door is opened, to pivot the fuel cap to open the fuel inlet according to release of pressing by the fuel door,
• wherein the fuel cap operating mechanism includes:
• a door button slidably mounted at the fuel inlet, coupled to the fuel cap to pivot the fuel cap when the door button slides, and configured to protrude from the fuel inlet to be configured to be pressed in a first direction by the fuel door in a state of sliding in a second direction which is opposite to the first direction thereof;
• and
• a button spring mounted at the fuel inlet to elastically support the door button, and, when the pressing of the door button by the fuel door is released, configured to provide an elastic restoration force to the door button for allowing the door button to slide in the second direction.