Fuel door apparatus for vehicle

1. A fuel door apparatus for a vehicle, comprising:

a fuel door rotatable connected to a door housing, wherein the fuel door is connected with an elastic member of the door housing to receive an elastic force in an opening direction and includes a guide pin elastically moving;

a locking lever rotatably connected to the door housing, wherein the locking lever has a first end portion disposed on a rotation radius of the guide pin, such that the guide pin passes by the locking lever along the rotation radius when the fuel door rotates from an opening position to a closed position, and the locking lever rotates with the guide pin when the fuel door rotates from the closed position to the opening position;

a restraining lever spaced apart from the locking lever to be rotatable on the door housing, wherein the restraining lever has a first end portion disposed in a radius, on which a second end portion of the locking lever rotates, and is latched on the locking lever in the closed position; and

a drive controller disposed in the door housing, wherein the driver controller is in contact with or separated from the restraining lever depending on whether the fuel door is opened or closed to selectively allow rotation of the restraining lever.

2. The fuel door apparatus of claim 1 , further comprising:

a hinge pin rotatably mounted on the door housing, such that the fuel door rotates on the hinge pin,

wherein a first end portion of the elastic member is connected with the door housing and a second end portion of the elastic member is fixed to the hinge pin to provide the elastic force so that the fuel door rotates together with the hinge pin.

3. The fuel door apparatus of claim 1 ,

wherein the locking lever is spaced apart from a rotation center point of the fuel door and disposed on the door housing to be rotatable through a first hinge of the locking lever, and

the first end portion of the locking lever has a curved surface at a portion corresponding to the guide pin at the closed position.

4. The fuel door apparatus of claim 1 , wherein the locking lever has a dented portion at the first end portion of the locking lever such that the guide pin is latched on the dented portion when the fuel door rotates from the opening position to the closed position,

wherein the dented portion has an inclined surface, an inclination of which gradually increases toward an end of the first end portion of the locking lever.

5. The fuel door apparatus of claim 1 , further comprising:

an inserting groove, into which the guide pin is inserted, in the fuel door,

wherein the guide pin is elastically supported by an elastic spring disposed inside the inserting groove.

6. The fuel door apparatus of claim 1 , further comprising:

a second hinge part through which the restraining lever is rotatable installed on the door housing; and

a catching protrusion protruding toward the locking lever at a first end portion of the restraining lever such that the second end portion the locking lever is latched on the catching protrusion.

7. The fuel door apparatus of claim 6 ,

wherein an end of the second end portion of the locking lever has a curved surface; and

the catching protrusion of the restraining lever protrudes in a streamline shape.

8. The fuel door apparatus of claim 1 , wherein the first end portion of the locking lever and the second end portion of the restraining lever are connected with each other through a restoring spring.

9. The fuel door apparatus of claim 1 , wherein the restraining lever comprises:

a restraining hole at the second end portion of the restraining lever,

wherein the door housing includes a retraining pin, which is inserted into the restraining hole to limit rotation of the restraining lever when the drive controller operates.

10. The fuel door apparatus of claim 9 , wherein the drive controller operates such that the restraining pin corresponds to the restraining hole of restraining lever when the fuel door is in the closed position and the first end portion of restraining lever is latched on the second end portion of the locking lever.

11. The fuel door apparatus of claim 1 ,

wherein the door housing includes:

a mounting body to which the locking lever, the restraining lever, and the drive controller are mounted; and

a fuel supply space having a fuel inlet,

wherein the fuel door comprises:

a door plate having first end portion extending to and mounted on the mounting body and a second end portion extending to the fuel supply space; and

a door panel coupled to the door plate and formed to close the fuel supply space.

12. The fuel door apparatus of claim 11 ,

wherein the drive controller and the first end portion of the door plate are disposed in the mounting body, and the locking lever and the restraining lever are disposed outside the mounting body,

wherein the guide pin is disposed at the first end portion of door plate and exposed from an interior toward an exterior of the mounting body.

13. The fuel door apparatus of claim 12 , wherein the mounting body has a guide hole extending along a radius on which the guide pin rotates together with rotation of the fuel door.

14. The fuel door apparatus of claim 1 , wherein the elastic member includes a coil spring.