Air control valve for fuel cell vehicle

1. An air control valve for a fuel cell vehicle, the air control valve comprising:

a valve housing having a first port and a second port;

a first rotary shaft rotatably mounted in the valve housing and configured to be rotated by a driving source;

a first valve member connected to the first rotary shaft and configured to selectively open or close the first port by rotating about the first rotary shaft;

a second rotary shaft mounted in the valve housing and configured to rotate relative to the first rotary shaft;

a second valve member connected to the second rotary shaft and configured to selectively open or close the second port by rotating about the second rotary shaft; and

a spring member connected, at a first end thereof, to the first rotary shaft and connected, at a second end thereof, to the second rotary shaft,

wherein when a rotational force from the driving source is applied to the first rotary shaft in a state in which a rotation of the second rotary shaft is allowed, the second rotary shaft is rotated by the first rotary shaft by the spring member,

wherein when the rotational force from the driving source is applied to the first rotary shaft in a state in which a rotation of the second rotary shaft is restricted, the spring member is compressed, the first rotary shaft is configured to rotate relative to the second rotary shaft, and an elastic rotational force generated by the compression of the spring member is applied to the second rotary shaft, and

wherein in a state in which the second valve member is disposed to close the second port, a pressing force generated by the rotation of the first rotary shaft is applied to the first valve member, and a pressing force generated by the rotation of the second rotary shaft is applied to the second valve member in a same direction as the elastic rotational force generated by the spring member is applied to the second valve member.

2. The air control valve of claim 1 , wherein an air discharge port of a fuel cell stack is connected to the first port, and an air inlet port of the fuel cell stack is connected to the second port.

3. The air control valve of claim 1 , wherein the second rotary shaft is disposed at an end of the first rotary shaft in a longitudinal direction of the first rotary shaft and provided coaxially with the first rotary shaft.

4. The air control valve of claim 3 , comprising:

a first flange portion formed at an end of the first rotary shaft; and

a second flange portion formed at an end of the second rotary shaft facing the first flange portion,

wherein the first end of the spring member is connected to the first flange portion and the second end of the spring member is connected to the second flange portion.

5. The air control valve of claim 1 , comprising:

a valve seating part provided on the second port and having an inclined seating surface that has a greater height than a seating surface of the first port and configured to allow the second valve member to be seated thereon,

wherein when the first rotary shaft is rotated by the driving source, the second valve member is seated on the inclined seating surface first before the first valve member is seated on the seating surface, and

wherein the rotation of the second rotary shaft is restricted when the second valve member is seated on the valve seating part.

6. The air control valve of claim 5 , wherein the first valve member and the second valve member are disposed at an equal inclination angle with respect to the first rotary shaft in a state in which the first port and the second port are opened.