Fuel Filling Device for a Ship and a Fuel Cap Thereof

A fuel filling device for a ship comprising:

• a fuel pipe seat including a fixed seat having a filling port, with the fuel pipe seat further including a fuel pipe extending downward from and in communication with the filling port, with the fuel pipe including an inner peripheral face, with a first engagement portion, a second engagement portion, and a third engagement position formed on the inner peripheral face of the fuel pipe and spaced from each other in a circumferential direction;
• a fuel cap including a body extending along a longitudinal axis, with the fuel cap further including an operative portion mounted to the body, with the body including an outer periphery, with a first track, a second track, and a third track formed on the outer periphery of the body and spaced from each other in a circumferential direction about the longitudinal axis, with each of the first, second, and third tracks including a front, lower end and a rear, higher end having a stop, with an entrance defined in front of the front, lower end of each of the first, second, and third tracks,
• wherein the fuel cap is inserted into the fuel pipe of the fuel pipe seat with the first, second, and third engagement portions respectively received in the entrances of the first, second, and third tracks, the fuel cap is rotated relative to the fuel pipe seat in a locking direction, the first, second, and third tracks move relative to the first, second, and third engagement portions until the first, second, and third engagement portions are stopped by the stops of the first, second, and third tracks, and the fuel cap is in a locking position and blocks the fuel pipe.