External active air flap apparatus of vehicle

1. An external active air flap apparatus, comprising:

an air flap positioned at a rear of a radiator grill and configured to rotate to open and close an air passage of the radiator grill; and

a flap fixing mechanism mounted on the radiator grill and the air flap and contacting the air flap with the radiator grill by a wind pressure applied to the air flap in order to increase a seal between the air flap and the radiator grill,

wherein the flap fixing mechanism includes:

a grill protrusion component that protrudes upward from a rear end of the radiator grill toward an interior space of the radiator grill; and

a flap protrusion component and a protrusion head component mounted on one surface of the air flap to protrude forward when the air flap is operated to seal the air passage, wherein

the protrusion head component is inserted into the interior space of the radiator grill and is locked to the grill protrusion component to be fixed.

2. The external active air flap apparatus of claim 1 , further comprising:

a first actuator coupled to a rotating shaft of the air flap to supply power to rotate the air flap;

a flap transition mechanism coupled to the first actuator that vertically translocates the air flap, including the first actuator; and

a second actuator coupled to the flap transition mechanism to supply power to move the flap transition mechanism.

3. The external active air flap apparatus of claim 2 , wherein a rotating shaft of a first side of the air flap is coupled to the first actuator and a rotating shaft of a second side thereof is rotatably coupled with a connection mechanism, and

the connection mechanism is fixedly mounted on a front bumper.

4. The external active air flap apparatus of claim 2 , wherein the flap transition mechanism includes:

a transition rod movably mounted vertically while being positioned at one side of the air flap and fixed with the first actuator and having a rack gear mounted on one surface thereof along a vertical length direction; and

a pinion gear meshed with the rack gear and directly connected to the second actuator.

5. The external active air flap apparatus of claim 4 , wherein a plurality of air flaps are vertically spaced apart from each other, and any one of the plurality of air flaps is directly connected to the first actuator and the remaining air flaps have rotating shafts of the first side rotatably mounted on a transition rod and rotating shafts of the second side rotatably mounted on the connection mechanism.

6. The external active air flap apparatus of claim 5 , wherein the plurality of air flaps are connected to each other by a connection link to simultaneously rotate by the first actuator.

7. The external active air flap apparatus of claim 5 , wherein when the plurality of air flaps are operated to seal the air passage, rear portions of each air flap are provided with an L-shaped overlapping component to remove a gap between the air flaps.

8. The external active air flap apparatus of claim 7 , wherein a surface of the overlapping component is coupled with a pad member to increases a seal between the air flaps.

9. The external active air flap apparatus of claim 2 , wherein the first actuator and the second actuator are a motor, and the second actuator is fixedly mounted on the vehicle body.

10. The external active air flap apparatus of claim 2 , wherein the first actuator and the second actuator are operated by a controller receiving a signal from a vehicle speed sensor.