Resonator for vehicle

1. A resonator for a vehicle, which reduces intake noise by using a resonance chamber for frequency tuning, the resonator comprising:

an outer pipe having a first outer pipe with an inlet for introducing external air and a second outer pipe with an outlet for discharging the air introduced into the inlet to outside;

an inner pipe disposed inside the outer pipe and having a plurality of slits for giving a passage of air; and

an expansion pipe inserted between the outer pipe and the inner pipe to partition a space between the outer pipe and the inner pipe into a plurality of spaces and thus partition the resonance chamber into a plurality of regions,

wherein the expansion pipe comprises:

an internal coupling unit coupled to the inner pipe;

an external coupling unit coupled to the outer pipe; and

a plurality of bent portions extending in a direction perpendicular to the inner pipe and the outer pipe, and

wherein the plurality of bent portions comprises:

a first bent portion disposed adjacent to the inlet and having one end connected to the internal coupling unit in a perpendicular direction;

a second bent portion having one end connected to the internal coupling unit in a perpendicular direction and the other end connected to the external coupling unit in a perpendicular direction; and

a third bent portion disposed adjacent to the outlet and having one end connected to the external coupling unit in a perpendicular direction.

2. The resonator for a vehicle according to claim 1 ,

wherein there is provided just a single expansion pipe, and

wherein one end of the expansion pipe is disposed to be spaced apart from the outer pipe by a predetermined distance to form an interval serving as a passage of air.

3. The resonator for a vehicle according to claim 1 ,

wherein a terminal of the first bent portion is bent to a direction parallel to an extension direction of the first outer pipe so that the first outer pipe and the first bent portion are disposed to be spaced apart from each other by a predetermined distance, and

wherein a terminal of the third bent portion is bent to a direction parallel to a length direction of the inner pipe for coupling with the inner pipe.

4. The resonator for a vehicle according to claim 1 ,

wherein the plurality of slits include a first slit disposed adjacent to the inlet and a second slit spaced apart from the first slit by a predetermined distance based on the moving direction of air, and

wherein the resonance chamber includes a first resonance chamber communicating with the interval, a second resonance chamber communicating with the first slit and a third resonance chamber communicating with the second slit.

5. The resonator for a vehicle according to claim 4 ,

wherein the outer pipe configuring one surface of the first resonance chamber has a diameter, which is 1.4 to 1.6 times of a diameter of the internal coupling unit.

6. The resonator for a vehicle according to claim 4 ,

wherein the internal coupling unit has a height, which is 0.3 times of a diameter of the internal coupling unit.

7. The resonator for a vehicle according to claim 4 ,

wherein the interval has a width, which is 0.04 to 0.12 times of a diameter of the internal coupling unit.

8. The resonator for a vehicle according to claim 1 ,

wherein the outer pipe, the inner pipe and the expansion pipe are coupled by means of welding for hermetical sealing.

9. The resonator for a vehicle according to claim 1 , wherein the expansion pipe includes:

an inflow expansion pipe having the first bent portion extending from the inner pipe to the first outer pipe based on the moving direction of air; and

a discharge expansion pipe having the second bent portion and the third bent portion which connect the inner pipe to the second outer pipe.

10. The resonator for a vehicle according to claim 9 ,

wherein the outer pipe has an extension extending in a radial direction perpendicular to the moving direction of air, and

wherein a gap serving as a passage of air is formed between one side of the inflow expansion pipe and the extension.

11. The resonator for a vehicle according to claim 9 , wherein the resonance chamber includes:

a first resonance chamber formed between the first outer pipe and the first bent portion;

a second resonance chamber formed between the first bent portion and the second bent portion;

a third resonance chamber formed between the second bent portion and the third bent portion; and

a fourth resonance chamber formed between the third bent portion and the second outer pipe.

12. The resonator for a vehicle according to claim 9 ,

wherein the outer pipe, the inner pipe, the inflow expansion and the discharge expansion pipe are coupled by means of welding for hermetical sealing.