KR100279699B1 - Muffler of the car - Google Patents

Abstract

The present invention relates to a muffler of an automobile, and its object is to reduce the back pressure of exhaust gas discharged during high-speed operation of the engine with a sound absorbing material and to reduce the back pressure to contribute to the improvement of engine output.

The present invention for achieving the object described above, the suction pipe 2 and the discharge pipe (2 ') and the inside of the housing 1, the housing 1 having a constant capacity is mounted in communication with each other in front and rear, respectively; A plurality of partitions 3,3a and 3b installed in the wall to divide the internal space, and a plurality of tubes 4 and 4 'fixed vertically through the partitions 3,3a and 3b in the longitudinal direction. In the vehicle muffler, the housing (1) is provided with a sound absorbing material (5) for reducing the air flow generated during high-speed operation of the engine, and a branch pipe (6) for inducing exhaust gas to the sound absorbing material (5). It is characterized by.

Description

Muffler of the car

The present invention relates to a muffler equipped with a sound absorbing material to reduce exhaust noise, and more particularly, to a muffler of an automobile capable of reducing high speed airflow through the sound absorbing material while improving the output by reducing the back pressure during high speed operation of the engine. will be.

In general, a muffler (also called a resonator) of a vehicle is mounted on an exhaust line to reduce exhaust noise. The muffler uses Helmholtz's principle of resonance with a hollow box or a cylindrical shape. It is to reduce the exhaust noise level, that is, to reduce the noise level in a specific frequency band according to the volume size in the muffler.

1 is a cross-sectional view of the conventional general muffler as described above, that is, the housing 11 having a constant capacity, generally having a quadrangular box or a cylindrical cross section, respectively, the suction pipe 12 and the discharge pipes in front and rear, respectively. The pipe 12 'is mounted in communication with each other, and a plurality of partitions 13 are provided inside the housing 11 to divide the internal space, so that a plurality of tubes 14 are provided in the partitions 13 with a plurality of partitions ( 13) penetrates longitudinally and is fixedly installed.

Accordingly, the muffler is configured to attenuate the exhaust noise by lowering the temperature and pressure of the exhaust gas discharged during operation of the engine, that is, the exhaust gas discharged when the engine is running is transferred to the muffler through the front suction pipe 12. Passing into the housing 11 and passing through the plurality of tubes 14 installed between the plurality of partitions 13, the pressure and the temperature are lowered and discharged into the atmosphere through the discharge pipe 12 ′.

However, in the conventional muffler as described above, the exhaust noise of the low frequency region of the exhaust gas discharged at the low speed of the engine can be reduced, but the airflow noise (the exhaust noise of the high frequency region due to the high back pressure at the high speed of the engine operation) Noise generated when the speed is more than 50m / s) was not able to effectively reduce.

Accordingly, the present invention has been made to solve the above-mentioned disadvantages, and provides a muffler of a vehicle that can contribute to the improvement of the engine output by reducing the back pressure while reducing the airflow of the exhaust gas discharged at high speed of operation of the engine with a sound absorbing material. Has its purpose.

1 is a cross-sectional view showing a conventional general muffler.

2 is a cross-sectional view showing a muffler of a motor vehicle according to the present invention.

3 is a diagram illustrating main parts of FIG. 2.

* Explanation of symbols for main parts of the drawings

1 housing 2 suction pipe

2 ': exhaust pipe 3: bulkhead

3a: first partition 3b: second partition

4,4 ′: tube 5: sound absorbing material

6: branch pipe 7: chamber

8: spring 9: valve

10: hole

The present invention for achieving the above object, the suction pipe and the discharge pipe is mounted in communication with each other in the front and rear, each having a predetermined capacity, a plurality of partitions installed inside the housing to divide the internal space and A muffler of a vehicle comprising a plurality of tubes fixed vertically through the partition wall in a longitudinal direction, wherein the housing includes a sound absorbing material for reducing airflow generated during high-speed operation of the engine, and inducing exhaust gas to the sound absorbing material. It is configured to have a branch pipe.

To this end, the sound absorbing material is filled in the chamber formed by the first partition and the second partition in the housing while the branch pipe is installed to communicate with the chamber formed by the first partition and the second partition, while the spring inside the branch pipe The valve is installed to open elastically via.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is a cross-sectional view showing a muffler of a motor vehicle according to the present invention, and FIG. 3 is a principal state diagram of FIG.

In the muffler of the automobile according to the present invention, as shown in the drawing, the housing 1 formed to have a predetermined capacity with a cylindrical cross section, respectively, the suction pipe 2 and the discharge pipe 2 'in front and rear, respectively. And a plurality of partitions (3, 3a, 3b) are installed in the interior of the housing (1) to divide the interior space of the housing (1) into a plurality of partitions (3, 3a, 3b) In a muffler of a vehicle in which a plurality of tubes (4, 4 ') are installed to penetrate a plurality of partitions (3, 3a, 3b) in the longitudinal direction, respectively, in the housing (1) the high-speed operation of the engine The sound absorption material 5 which reduces the airflow sound generated at the time, and the branch pipe 6 which guide | induces exhaust gas by this sound absorption material 5 are provided.

Here, the sound absorbing material 5 is made of glass fiber, for example, to be filled in the chamber 7 formed by the first partition 3a and the second partition 3b in the housing 1, and the suction pipe 2 A branch pipe 6 is installed in the chamber 7 formed by the first partition 3a and the second partition 3b, and is resilient through the spring 8 inside the branch pipe 6. The valve 9 which opens by the opening is provided.

That is, the valve 9 installed on the branch pipe 6 is opened and closed according to the flow rate of the exhaust gas flowing through the suction pipe (2).

In addition, a plurality of holes 10 having fine shapes each having a diameter of about 3 mm are drilled in the front end surfaces of the first partition 3a and the branch pipe 6, so that the holes 10 are operated at high speed of the engine. The exhaust gas introduced through the suction pipe 2 is introduced into the chamber 7 formed by the first partition 3a and the second partition 3b through the branch pipe 6 to mediate the sound absorbing material 5. The air pressure in the exhaust gas is reduced while reducing the back pressure.

Therefore, the exhaust gas discharged at the low speed of operation of the engine flows into the housing 1 through the suction pipe 2 of the muffler, where the valve 9 of the branch pipe 6 is driven by the elastic force of the spring 8. Since the gas is kept closed, the exhaust gas expands and sequentially passes through the tubes 4 'and 4 installed in the partition 3 while attenuating the exhaust noise in the low frequency region. Will be discharged to the air.

On the other hand, the exhaust gas discharged at the high speed of the engine is also introduced into the housing 1 through the suction pipe 2 of the muffler, wherein the high pressure exhaust gas introduced therein is a valve 9 installed in the branch pipe 6. The valve (9) is opened upwards to overcome the elastic force of the spring (8) of the spring (8) and flows into the chamber (7) formed by the first partition (3a) and the second partition (3b), the chamber 7 Exhaust gas introduced into the inside is discharged to the outside while the airflow sound, which is the exhaust noise in the high frequency region, is reduced by the flaw material 5 filled in the chamber 7.

At this time, the high-pressure exhaust gas flowing into the housing 1 through the suction pipe 2 passes through the holes 10 drilled into the branch pipe 6 and the first partition 3a, respectively, to reduce the back pressure. The output of the engine is thus improved.

As described above, according to the muffler incorporating the sound absorbing material according to the present invention, the high-pressure exhaust gas discharged therefrom at the time of high speed operation of the engine is introduced into the chamber 7 incorporating the sound absorbing material 5 to exhaust air in the high frequency region. In addition to reducing the sound, the back pressure is reduced while passing through a plurality of holes 10 drilled in a minute shape on the front end surfaces of the first partition 3a and the branch pipe 6, thereby improving the output of the engine. Will get

Claims (1)

A suction pipe 2 and a discharge pipe 2 'mounted in communication with the front and rear of the housing 1 having a predetermined capacity, and a plurality of partitions 3, 3a installed to divide a space in the housing 1; 3b), a plurality of tubes 4, 4 'fixed through the barrier ribs 3, 3a, 3b, branch pipes 6 branched from the suction pipe 2, and the branch pipes 6 In the motor vehicle muffler including the sound absorbing material 5 filled in the chamber 7 located therein, the branch pipe 6 is provided with a valve 9 which is elastically opened and closed via a spring 8. On the front end surface of the branch pipe 6 and the first partition 3a forming the chamber 7, a plurality of fine holes 10 are drilled to reduce the back pressure of the exhaust gas. Muffler of the car.