KR19990026466U - Car silencer - Google Patents

Abstract

The present invention relates to a silencer of an automobile, wherein the inlet pipe (7a) is connected to the exhaust pipe to introduce the exhaust gas into the silencer, and the exhaust gas passing through the inlet pipe (7a) to the third resonance chamber (9c) The center pipe 7c passed through and the exhaust gas passing through the center pipe 7c and exiting the first resonance chamber 9a pass therethrough, but are connected to the exhaust pipe to discharge the exhaust gas to the outside. ), Baffle plates 10a and b supporting the baffle pipes 7a, b and c, and first, second and third resonances inside the baffle plates 10a and b. The space is divided into the chambers 9a, b, and c, and a plurality of holes 8a, b, and c are formed in the portions of the baffle pipes 7a, b, and c located in the second resonance chamber 9b. In the silencer (5) of the motor vehicle, which is composed of a cylindrical member (6) surrounding the above, the second resonance chamber (2) in the baffle pipes (22a, b, c) 4b) each part is formed to be inclined diagonally, but the horizontal distance is maintained the same as the conventional, thereby providing a silencer of the vehicle that is only extended in length, exhaust through the catalytic converter through the exhaust manifold from the engine When the gas passes through the silencer, low-frequency noise is reduced to provide improved driving performance.

Description

Car silencer

The present invention relates to a muffler of an automobile. In particular, the shape of the baffle pipes formed in the muffler in the longitudinal direction is changed in a diagonal direction so that the length thereof becomes longer, so that the exhaust gas passes through the baffle pipes. To reduce the noise of a car.

In general, the vehicle is powered by the combustion action of a mixture of fuel and air, such as gasoline and diesel, or LPG, and the vehicle is capable of running by the power obtained as described above.

As is widely known, fuel stored in a fuel tank of an automobile is injected into an engine by an injector through a fuel system, and as described above, when a fuel is mixed with the fuel injected by the injector to generate a mixer, the engine of the automobile Will generate power by burning the mixer. That is, each cylinder of the engine burns the mixer while performing the intake, compression, explosion and exhaust strokes.

Therefore, as described above, after the mixer is combusted in the engine, the exhaust gas generated by the combustion is generated, and the exhaust gas is discharged to the outside of the vehicle through the exhaust system of the vehicle.

FIG. 1 shows an exhaust system 2 of a motor vehicle, in which exhaust gas combusted in the engine 1 passes through a catalytic converter 4 and a silencer through an exhaust manifold 3 of the engine 1 as shown. After passing through (5), it is discharged to the outside of the vehicle.

The catalytic converter 4 is a device for purifying harmful substances contained in the exhaust gas into harmless substances by oxidation and reduction.

In addition, the silencer 5 lowers the temperature and pressure of the exhaust gas when the exhaust gas is discharged, thereby lowering the exhaust noise. There are various types of structures of the silencer, but generally shown in FIGS. 2 and 3. As shown in the figure, a steel plate of about 1 mm is formed into a cylindrical member 6, and the interior is divided into several spaces 9a, b, and c. It causes a drop in temperature and gradually makes noise.

That is, the silencer 5 includes an inlet pipe 7a through which an exhaust gas flows through an exhaust pipe (not shown), a center pipe 7c, and an exhaust pipe to the outside through the exhaust pipe. The outlet pipe 7b to be discharged is supported by the baffle plates 10a and b on both sides, and is located in the second resonance chamber 9b in the baffle pipes 7a, b and c. A plurality of holes 8a, b, and c are formed in each.

Therefore, when the exhaust gas from the engine 1 passing through the catalytic converter 4 through the exhaust manifold 3 flows into the muffler 5 through the exhaust pipe into the inlet pipe 7a, a large amount of exhaust gas is inleted. Passing through the pipe 7a as it is, and exits the third resonance chamber 9c, again flows into the center pipe 7c, exits the first resonance chamber 9a, and then flows into the outlet pipe 7b to the outside through the exhaust pipe. To be discharged.

However, at this time, since the exhaust gas passing through the baffle pipes 7a, b, and c is a high temperature and high pressure, the exhaust gas rapidly expands when passing through the baffle pipes 7a, b, and c. It is discharged to the second resonance chamber (9b) through the holes (8a, b, c) formed in the baffle pipes (7a, b, c) to suppress the sudden explosion sound due to the expansion of the exhaust gas.

Exhaust gases discharged to the second resonance chamber 9b through the holes 8a, b and c formed in the respective baffle pipes 7a, b and c as described above are, for example, inlet pipes as shown in FIG. 3. The exhaust gas discharged through the hole 8a of 7a flows through the hole 8c of the center pipe 7c and circulates or flows through the hole 8b of the outlet pipe 7b and immediately discharges to the outside. Will be.

Further, the exhaust gas passing through the center pipe 7c and the outlet pipe 7b is also discharged to the second resonance chamber 9b through the holes 8c and 8b, respectively, and then the holes 8a such as the inlet pipe 7a. Inflow through the recirculation process.

In this way, the exhaust gas is discharged to the outside after passing through the various stages of each of the baffle pipes 7a, b, c without temporarily discharging the exhaust gas to the outside at once, and the exhaust gas is gradually expanded as described above, and the pressure and temperature are This is to prevent violent binge from being lowered.

However, if the silencer's resistance is too high to increase the noise effect, the engine's sound level decreases, but the resistance to the exhaust stroke, that is, the back pressure increases, which reduces the engine's output. Deciding the degree.

However, as described above, when the exhaust gas passes through the silencer, noise due to the wavelength of the frequency is generated. As is well known, the wavelength is inversely proportional to the frequency, so the lower the frequency is, the larger the frequency is, and the frequency is inversely proportional to the volume. .

Therefore, since the battle pipes such as the inlet pipe, the center pipe, and the outlet pipe through which the exhaust gas passes are formed in a straight line in the longitudinal direction, the volume is limited, so that the suppression of low frequency noise is insignificant and the running performance is deteriorated. there was.

Thus, the present invention was devised to solve the above problems, by changing the shape of the baffle pipes formed in the longitudinal direction in the muffler in the diagonal direction to lengthen the length to eventually increase the volume, thereby reducing the noise of low frequency The purpose is to provide a silencer for a vehicle to be suppressed.

The present invention for achieving the above object is connected to the exhaust pipe inlet pipe for introducing the exhaust gas into the silencer, the center pipe through which the exhaust gas passed through the inlet pipe to the third resonance chamber, and the center Exhaust gas passing through the pipe and exiting the first resonance chamber passes through the pipe, the outlet pipe connected to the exhaust pipe to release the exhaust gas to the outside, the baffle plates supporting the baffle pipes, and the baffle plates. A space is divided into first, second, and third resonance chambers, and a plurality of holes are formed in portions of baffle pipes located in the second resonance chamber, and the cylindrical member is formed of a cylindrical member surrounding the above. In the muffler, portions of the baffle pipes located in the second resonance chamber are inclined in diagonal directions, respectively. By distance remains the same as prior art, it is characterized in that the end to be made of only the length extension.

1 is a perspective view showing an exhaust system of a general vehicle,

2 is a cross-sectional view of the internal structure of the silencer in FIG.

3 is a cross-sectional view taken along the line A-A of FIG.

Figure 4 is a cross-sectional view of the internal structure of the silencer according to the present invention,

5 is a cross-sectional view taken along the line B-B in FIG.

Explanation of symbols on the main parts of the drawings

20: silencer 21: cylindrical member

22a, b, c: baffle pipe 22a: inlet pipe

22b: Outlet Pipe 22c: Center Pipe

23a, b, c: hole 24a, b, c: resonance chamber

25a, b: baffle plate

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

4 is a cross-sectional view of the internal structure of the silencer of the vehicle according to the present invention, and FIG. 5 is a cross-sectional view taken along line B-B of FIG. 4.

As shown in Figs. 4 and 5, the inlet pipe 22a is included in the cylindrical member 21 forming the silencer 20, the shape of which is from the first baffle plate 25a to the second baffle plate 25b. The angle is diagonally upward.

The outlet pipe 22b, which is also connected to the end of the exhaust pipe for discharging the exhaust gas passed through the silencer 20 to the outside, is also included in the cylindrical member 21 forming the silencer 20. The portion passing through the first baffle plate 25a sags downward to form a diagonal diagonal with respect to the portion passing through the second baffle plate 25b. That is, the structure is bent upward from the first baffle plate 25a.

In addition, the center pipe 22c provided between the first baffle plate 25a and the second baffle plate 25b in the silencer 20 is inclined in a direction opposite to the outlet pipe 22b as shown in FIG. 5. That is, a portion passing through the first baffle plate 25a is positioned upward, and a portion passing through the second baffle plate 25b is positioned downward, so that the first baffle plate 25a is also diagonally formed. It is bent downward from.

As described above, the baffle pipes 22a, b, and c, each of which has a predetermined portion formed diagonally, are diagonally formed only in the second resonance chamber 24b in the silencer 20 as described above.

Referring to the operational relationship of the silencer 20 of the vehicle configured as described above is as follows.

First, the exhaust gas passing through the catalytic converter through the exhaust manifold of the engine is introduced into the silencer 20 through the inlet pipe 22a coupled to the end of the exhaust pipe through the exhaust pipe.

Then, the exhaust gas flowing through the inlet pipe 22a and exiting the third resonance chamber 24c flows back into the center pipe 22c and then passes through the outlet pipe 22b through the first resonance chamber 24a. After the exhaust pipe is discharged to the outside.

In addition, when the exhaust gas passes through the baffle pipes 22a, b, and c, the exhaust gas is discharged or introduced through holes 23a, b, and c formed in portions positioned in the second resonance chamber 24b, respectively. The explosion sound caused by the rapid expansion of the exhaust gas is suppressed, and as it is introduced into the outlet pipe (22b) of the exhaust gas discharged or introduced through the respective holes (23a, b, c) as described above is discharged to the outside as it is The other inlet pipe 22a or the center pipe 22c flows into the recirculation process.

As described above, the operation of the silencer is not different from that of the conventional silencer. However, as described above, since the portions of the baffle pipes 22a, b, and c located in the second resonance chamber 24b are diagonal to each other, the exhaust gas is exhausted. When low noise is generated in the exhaust gas when the baffle pipes 22a, b and c pass through the diagonal portions, the diagonal noise is more diagonal than when passing through the battle pipes 7a, b and c formed in a straight line as in the prior art. Low frequency noise is reduced when passing through the battle pipes (22a, b, c) according to the present invention made of an extended length.

This is due to an increase in the volume of the baffle pipes through which the exhaust gas is passed, since the length is extended under a horizontal distance that is diagonal than the straight line.

For reference, as described above, a portion of the baffle pipes 22a, b, and c that is positioned diagonally in the second resonance chamber 24b is not limited to the angle, and the up and down bending directions also have mutual interference. It can be freely deformed as long as it does not cause

According to the present invention as described above, the low-frequency noise is reduced when the exhaust gas passing through the catalytic converter through the exhaust manifold in the engine passes through the silencer, thereby providing improved driving performance.

Claims (1)

An inlet pipe 7a connected to the exhaust pipe to introduce the exhaust gas into the silencer, a center pipe 7c through which the exhaust gas from the third resonant chamber 9c passes through the inlet pipe 7a, and the Outlet pipe 7b passing through the center pipe 7c and exiting the first resonance chamber 9a passes through the center pipe 7c and is connected to the exhaust pipe to discharge the exhaust gas to the outside, and the baffle pipes 7a, baffle plates (10a, b) for supporting the b, c and space inside the first, second, and third resonance chamber (9a, b, c) by the baffle plates (10a, b) The divided, but a plurality of holes (8a, b, c) is formed in the portion of the baffle pipes (7a, b, c) located in the second resonance chamber (9b), the cylindrical member 6 surrounding the above In the silencer (5) of the automobile composed of In the baffle pipes (22a, b, c), the portions located in the second resonance chamber 24b are inclined diagonally, respectively, but the horizontal distance is maintained the same as before, so that only the length is eventually extended. Silencer of the car.