KR19980075130A - Noise reduction silencer of car - Google Patents

Abstract

The present invention discloses a noise reduction silencer of an automobile. The disclosed invention includes: upper and lower shells (11, 12) installed in an exhaust pipe through which exhaust gas is moved; In the silencer of the vehicle comprising a plurality of partitions (14) installed in the upper and lower shells (11, 12) orthogonal to the traveling direction of the exhaust gas, a mesh in the upper and lower shells (11, 12) Shaped support rods 4 are described, the upper and lower ends of which are fixed to the upper and lower shells 11 and 12 respectively, and the support rods 4 are fitted to the partitions so as to connect the respective partition walls 14 to each other.

Description

Noise reduction silencer of car

The present invention relates to a noise reduction silencer of a vehicle of the present invention, and more particularly, to a silencer for reducing radiation generated when an exhaust gas hits a shell forming a skeleton of a silencer.

Combustion gas combusted in an automobile engine and discharged through an exhaust manifold is a gas having a high temperature of 600 to 800 ° C. and a high pressure of 3 to 5 kgf / cm 2. In addition, since there is a possibility of causing a fire, a silencer is installed in the exhaust manifold, which serves to limit the loss of power to within 5% while fully expanding the combustion gas to prevent this.

In this method, sound absorbing materials are used, or combustion gases are blown out of small holes to lower pressure and temperature to absorb energy, or the flow path of the combustion gas is divided into two flow paths of different lengths. There are many ways to reduce noise by interference, ie resonance.

There are various types of silencers for realizing this method. However, in general, a steel plate having a thickness of about 1 mm is welded in a cylindrical shape, and then a plurality of diaphragms are installed therein. In each pass, the noise is gradually reduced by the interference of sound waves, the reduction of pressure fluctuations, and the decrease of exhaust temperature.

As described above, the silencer for reducing the noise of the exhaust gas is roughly classified into a roll type shown in FIG. 1 and a press type shown in FIG. 2 by its external structure. The roll type silencer has a shape in which one shell 1 is rolled in an oval shape, and the press type has a shape in which upper and lower shells 11 and 12 are welded. In particular, the press-type silencer shells 11 and 12 are formed with several beads 13 for suppressing vibration.

In addition, although not shown in FIG. 1 and FIG. 2, several partitions for slowing the traveling speed of the exhaust gas are arranged so as to be orthogonal to the traveling direction of the exhaust gas in each type of silencers. Each partition partitions the shell 1, 11, 12 into the sound absorption chamber with a sound absorbing material, and the resonance chamber which resonates and reduces the noise of exhaust gas.

However, although the conventional muffler adopts a method of forming the beads 13 in the shells 11 and 12 and reducing the noise generated by the exhaust gas hitting the shell, that is, the sound of radiation, simply by the beads 13 alone. There was a problem that the effect of reducing the radiation is not enough. That is, the upper and lower shells (11, 12) are only connected at both ends by welding, the other part is not supported at all, there is a problem that generates a severe noise caused by vibration when the exhaust gas hits .

Accordingly, the present invention has been made to solve the problems caused by the conventional muffler, to enhance the bearing capacity of the upper and lower shells, to reduce the radiation noise caused by the impact of the exhaust gas vehicle noise reduction silencer The purpose is to provide.

1 is a perspective view showing a conventional roll type silencer outer structure

Figure 2 is a perspective view showing the appearance of a conventional press type silencer

Figure 3 is a view showing the silencer appearance of the built-in support bar according to the present invention

Figure 4 is a cross-sectional view showing a state in which the support rod is installed inside the silencer

Figure 5 is a cross-sectional view showing a coupling structure of the support rod and the partition which is the main part of the present invention

* Description of the symbols for the main parts of the drawings *

4: support rod 11: upper shell

12: lower shell 14: bulkhead

In order to achieve the above object, the present invention, the upper and lower shells installed in the exhaust pipe to which the exhaust gas is moved; In the silencer of the vehicle including a plurality of partitions installed in the upper and lower shells orthogonal to the traveling direction of the exhaust gas, a mesh support rod is described in the upper and lower shells, the upper and lower ends of which are It is fixed to each of the shell, the support rod is characterized in that the partition is fitted to the partition wall to each other.

According to the above-described configuration of the present invention, since the upper and lower shells are connected and fixed by a mesh support rod, the bearing force between the upper and lower shells is greatly strengthened, so that the radiation noise due to the collision of exhaust gas can be reduced. .

EXAMPLE

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

Figure 3 is a view showing the external appearance of the silencer with a built-in support bar according to the present invention, Figure 4 is a cross-sectional view showing a state in which the support bar is installed in the interior of the silencer, Figure 5 is a coupling structure of the support bar and the partition wall which is the main part of the present invention It is sectional drawing which shows.

For reference, in the description of the configuration of the present embodiment, the same parts as in the prior art described at the beginning of the specification are omitted and repeated descriptions are mainly described in order to avoid duplication of description. use.

As shown in FIG. 3, the silencer has a shape in which the outer edges of the upper and lower shells 11 and 12 constituting the outer skeleton are welded, and the inlet, which is a passage of the exhaust gas, is provided on both sides of the upper and lower shells 11 and 12. The pipe 2 and the withdrawal pipe 3 each have a connected structure. In addition, inside the upper and lower shells 11 and 12, several partitions (not shown) for slowing the traveling speed of the exhaust gas are arranged at regular intervals so as to be orthogonal to the traveling direction of the exhaust gas.

In the upper and lower shells 11 and 12, as shown in FIG. 4, a supporting rod 4 of a mesh shape is embedded. The upper and lower ends of the supporting rods 4 are fixed to the inner surfaces of the upper and lower shells 11 and 12 by welding, and as shown in FIG. 5, the supporting rods 4 are partition walls for partitioning the sound absorbing chamber and the resonance chamber ( 14) is installed so that a part is fitted.

With the above configuration, the exhaust gas entering the silencer through the inlet pipe 2 also collides with the partition 14 but also hits the inner walls of the upper and lower shells 11 and 12. At this time, the upper and lower shells 11 and 12 are not only welded to their outer periphery, but are also firmly connected and fixed by the supporting rods 4 of the mesh type, so that vibrations are suppressed even when the exhaust gas collides.

As described above, according to the present invention, since the upper and lower shells 11 and 12 are firmly connected and fixed to the supporting rods 4, vibrations caused by the collision of the exhaust gas are suppressed, and the radiation sound can be reduced. .

On the other hand, the present invention is not limited to the above-described specific preferred embodiments, and various changes can be made by those skilled in the art without departing from the gist of the invention claimed in the claims. will be.

Claims (1)

Upper and lower shells installed on exhaust pipes through which exhaust gases are moved; In the silencer of the vehicle comprising a plurality of partitions installed in the upper and lower shells orthogonal to the traveling direction of the exhaust gas, A mesh-shaped support rod is described in the upper and lower shells, and upper and lower ends thereof are fixed to the upper and lower shells, respectively, and the support rods are inserted into the partition walls so as to connect each partition wall to each other. .