KR20110038509A - Variable muffler for vehicle exhaust system - Google Patents

Abstract

PURPOSE: A variable muffler for an exhaust system of a vehicle is provided to maintain a tone of low noise by restricting exhaust sound in a high RMP area and increasing back pressure. CONSTITUTION: A variable muffler for an exhaust system of a vehicle comprises a case(10), an input pipe(30), an inner pipe(50), an output pipe(70) and a variable valve(90). The case divides the inner space into a first chamber(21), a second chamber(22) and a third chamber(23) through a first barrier(11) and a second barrier(13). The input pipe enters the front of the case, is supported by the first barrier and is connected to the second chamber via the first chamber. The inner pipe is supported on the first and second barriers in the inner space and is connected to the first chamber via the second and third chambers. The output pipe is supported on the first and second barriers in the inner space and is exposed to the rear of the case through the first to third chambers.

Description

Variable muffler for vehicle exhaust system {VARIABLE MUFFLER FOR VEHICLE EXHAUST SYSTEM}

An exemplary embodiment of the invention relates to an exhaust system of a vehicle, and more particularly to a variable muffler for a vehicle exhaust system that can be applied to a coupe vehicle such as a sports car.

In general, an exhaust system for discharging exhaust gas generated from an engine of a vehicle is provided with a muffler capable of attenuating exhaust noise on an exhaust line that directs the exhaust gas to the rear side of the vehicle.

The muffler is to reduce the exhaust noise by lowering the temperature and pressure of the exhaust gas discharged from the engine, the muffler is divided into various types according to the structure. Here, the internal space of the muffler is divided into a plurality of chambers through a plurality of partitions in order to increase the damping effect of the exhaust noise.

Therefore, the noise of the exhaust gas is gradually attenuated by the interference of sound waves, the reduction of pressure fluctuations, the decrease of the exhaust temperature, etc. in the course of passing through the chambers in the muffler.

On the other hand, in recent years, a variable muffler capable of increasing the back pressure or reducing the noise in the low RPM region according to the RPM region of the engine, and adjusting the exhaust path to reduce the back pressure or increase the output in the high RPM region is being developed. to be.

However, such a variable muffler is generally effective for tuning the tone of a sedan, but it is difficult to apply to a coupe vehicle such as a sports car which enhances the exhaust booming sound in a low RPM region to realize a sporty tone.

Therefore, in order to implement the sporty sound of the coupe, the conventional technology employs a muffler capable of reinforcing the exhaust booming sound in the low RPM region. In this case, the enhanced exhaust booming in the low RPM region improves the acceleration of the vehicle. Enhanced exhaust booming in the RPM area is disadvantageous to implement a sporty tone by reducing the lightness, and also increases the exhaust noise at the same time impairs the indoor noise.

Exemplary embodiments of the present invention have been created to remedy the above problems, and can enhance sporty sound by enhancing exhaust booming sound in a low RPM region of a coupe vehicle, and suppress exhaust sound and suppress back pressure in a high RPM region. The present invention provides a variable muffler for the vehicle exhaust system that increases and maintains a low noise tone such as a sedan as a light sporty tone mainly focused on intake sound.

To this end, a variable muffler for a vehicle exhaust system according to an exemplary embodiment of the present invention includes: (i) a case in which internal spaces are formed into first, second, and third chambers through first and second partitions, and ii) An exhaust gas input pipe drawn into the front side of the case and supported by the first partition wall and passing through the first chamber to the second chamber, and iii) supported by the first and second partition walls in the internal space, An inner pipe leading from the second chamber to the first chamber through the third chamber and the second chamber; and iii) the case is supported by the first and second partitions in the inner space, and passes through the first, second and third chambers, An exhaust gas output pipe drawn out to a rear side of the second chamber; and iii) a variable valve installed at the second partition wall to selectively connect the second chamber and the third chamber according to the back pressure inside the second chamber.

In the variable muffler for the vehicle exhaust system, the variable valve blocks the second chamber and the third chamber in a low speed region, and the second chamber may be configured as a main resonance chamber.

In the variable muffler for the vehicle exhaust system, the variable valve may open the second chamber and the third chamber in a high speed region, and the third chamber may be configured as an auxiliary resonance chamber interconnected with the second chamber.

According to the exemplary embodiment of the present invention as described above, in the low RPM oscillation zone of the coupe vehicle, the second chamber and the third chamber inside the case are blocked through the variable valve, and the main resonance chamber is formed in the second chamber. By increasing the exhaust swelling sound in the main resonance chamber, the sporty tone of the coupe vehicle can be achieved.

In addition, in the present embodiment, in the high RPM oscillation band of the coupe vehicle, the second chamber and the third chamber inside the case are opened through the variable valve to interconnect the main resonance chamber and the auxiliary resonance chamber in series, thereby suppressing exhaust booming and back pressure. You can increase the sound quality and keep the low noise sound like sedan.

In the present embodiment, since the main resonance chamber and the auxiliary resonance chamber can be interconnected in series through the variable valve in the high RPM oscillation band, the controllable frequency peak can be adjusted using the volume ratio of the main resonance chamber and the auxiliary resonance chamber.

Therefore, in the present embodiment, it is effective for tuning the oscillation tone of a coupe vehicle such as a sports car. In particular, a vehicle with a low engine displacement may increase the oscillation booming when the vehicle starts, thereby implementing a tone like a coupe vehicle through the engine.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

1 is a view schematically showing a variable muffler for a vehicle exhaust system according to an exemplary embodiment of the present invention.

Referring to the drawings, the variable muffler 100 for a vehicle exhaust system according to an exemplary embodiment of the present invention is applied to an exhaust system of a vehicle for discharging exhaust gas generated from an engine to the outside.

The variable muffler 100 basically reduces the temperature and pressure of the exhaust gas before discharging the high temperature and high pressure exhaust gas discharged from the engine to the atmosphere, thereby suppressing the explosion caused by the rapid expansion in the atmosphere.

The variable muffler 100 according to the present embodiment reinforces the exhaust booming sound in the low RPM oscillation band and suppresses the exhaust sound in the high RPM oscillation band to realize the sporty sound of a coupe vehicle such as a sports car. It is made as a structure that can implement a sporty tone of.

That is, in the present embodiment, in the muffler structure in which the exhaust sound is enhanced to realize the sporty sound of the coupe vehicle, the volume of the resonance chamber is varied in the high RPM oscillation band, thereby reducing the high-speed driving booming and increasing the back pressure, thereby achieving the low noise sound like the sedan vehicle. To adjust the exhaust tone.

To this end, the variable muffler 100 for the vehicle exhaust system according to the present embodiment includes a case 10, an exhaust gas input pipe 30, an inner pipe 50, an exhaust gas output pipe 70, and a variable valve. It is configured to include (90), and this is described by configuration as follows.

In this embodiment, the case 10 is mounted on an exhaust line for flowing exhaust gas discharged from the engine, and is provided as a muffler housing having a predetermined internal space.

The case 10 partitions the internal space into the first, second, and third chambers 21, 22, and 23, respectively, through the first and second partitions 11 and 13 spaced apart from each other in the internal space. .

Here, the first, second, third chambers 21, 22, 23 are sequentially formed from the front of the case 10 toward the rear.

In the present embodiment, the exhaust gas input pipe 30 is for injecting the exhaust gas discharged from the engine through the exhaust line into the inner space of the case 10, the case 10 on the front side of the case 10. It is installed to be led into the internal space of).

The exhaust gas input pipe 30 has a front end supported on the front side of the case 10, and rear end of the exhaust gas input pipe 30 passing through the first chamber 21 and supported by the first partition wall 11 in the inner space of the case 10. It is installed to lead to this second chamber 22.

In the present embodiment, the inner pipe 50 is for forming an exhaust path in the inner space of the case 10, and the second inner pipe 50 is supported by the first and second partitions 11 and 13 in the inner space. The chamber 22 is installed to pass through the third chamber 23 and the second chamber 22 to the first chamber 21.

That is, the inner pipe 50 has a front end supported by the second partition wall 13 in the second chamber 22, and passes through the third chamber 23 in a U-shape to form the second partition wall 13. ), And the rear end is supported by the first partition wall 11 while passing through the second chamber 22 to the first chamber 21.

In the present embodiment, the exhaust gas output pipe 70 is for discharging the exhaust gas introduced into the case 10, and the first and second partition walls 11 and 13 in the inner space of the case 10. It is supported on, and is installed to be drawn out to the rear side of the case 10 through the second and third chambers 22 and 23 in the first chamber 21.

Here, the exhaust gas output pipe 70 is supported by the second partition wall 13 through the second chamber 22, with the front end supported by the first partition wall 11 in the first chamber 21, After passing through the third chamber 23 again, the rear end is mounted to be drawn out to the rear side of the case 10.

In the present embodiment, the variable valve 90 is for selectively connecting the second chamber 22 and the third chamber 23 according to the back pressure inside the second chamber 22 in the inner space of the case 10. will be.

The variable valve 90 is installed to be fixed to the second partition wall 13 in the inner space of the case 10, and has a valve passage 91 connecting the second chamber 22 and the third chamber 23. And a valve body 93 for selectively opening and closing the valve passage 91 by the pressure difference between the second chamber 22 and the third chamber 23.

Since the variable valve 90 is made of a valve device of a known technique widely used in the art, a more detailed description of the configuration will be omitted herein.

On the other hand, the variable muffler 100 according to the present embodiment selectively connects the second chamber 22 and the third chamber 23 inside the case 10 through the variable valve 90, the variable valve When the second chamber 22 and the third chamber 23 are blocked by the 90, the second chamber 22 may be formed as the main resonance chamber 41.

In addition, when the second chamber 22 and the third chamber 23 are opened by the variable valve 90, the third chamber 23 is the auxiliary resonance chamber 42 interconnected with the second chamber 22. It can be made as.

Hereinafter, an operation state of the variable muffler 100 for a vehicle exhaust system according to an exemplary embodiment of the present invention configured as described above will be described in detail with reference to FIGS. 2A and 2B.

First, in the low RPM oscillation zone (low speed region) of the coupe vehicle engine, as shown in FIG. 2A, the exhaust gas flows into the second chamber 22 inside the case 10 through the exhaust gas input pipe 30.

Here, the variable valve 90 has a relatively low back pressure inside the second chamber 22 in the low RPM oscillation zone, and thus, the second chamber 22 and the third chamber inside the case 10 through the valve body 93. It is in the state which cut off (23).

Therefore, in this case, since the second chamber 22 is composed of the main resonance chamber 41, the exhaust swelling sound is enhanced in the main resonance chamber 41, so that the sporty sound of the coupe vehicle can be realized in the low RPM oscillation band. (See FIG. 3).

That is, in this embodiment, it is possible to improve the acceleration feeling of the vehicle through the exhaust boom sound enhanced in the low-RPM oscillation band.

In addition, the exhaust gas introduced into the second chamber 22 in the above process is discharged into the first chamber 21 while flowing into the inner pipe 50, and then flows back into the exhaust gas output pipe 70 and the case 10. It is discharged to the outside.

Meanwhile, in the high RPM oscillation zone (low speed region) of the coupe vehicle engine, as shown in FIG. 2B, the exhaust gas is introduced into the second chamber 22 inside the case 10 through the exhaust gas input pipe 30 as before. .

Here, since the variable valve 90 has a high back pressure inside the second chamber 22 in the high RPM oscillation zone, the second chamber 22 inside the case 10 while the valve body 93 rotates by the back pressure. ) And the third chamber 23 are in an open state.

In this case, therefore, the second chamber 22 as the main resonance chamber 41 and the third chamber 23 as the auxiliary resonance chamber 42 are interconnected through the valve passage 91 of the variable valve 90. As a result, the volume of the entire resonant chamber is increased, thereby suppressing the exhaust bouncing in the high RPM oscillation band, thereby creating a pleasant sporty tone mainly based on the intake sound.

That is, in the present embodiment, the main resonance chamber 41 and the auxiliary resonance chamber 42 are opened through the variable valve 90 in the high RPM oscillation band, thereby increasing the volume of the entire resonance chamber, and consequently, reducing exhaust booming and Increasing the back pressure reduces the exhaust noise to maintain the same low noise tone as the sedan vehicle (see FIG. 3).

Further, in this embodiment, since the main resonance chamber 41 and the auxiliary resonance chamber 42 can be interconnected in series through the variable valve 90 in the high RPM oscillation band, an additional advantage of controlling two peaks is possible. As can be seen, the controllable frequency peak can be adjusted using the volume ratio of the main resonance chamber 41 and the auxiliary resonance chamber 42.

In addition, the exhaust gas introduced into the second chamber 22 in the above process is discharged into the first chamber 21 while flowing into the inner pipe 50, and then flows back into the exhaust gas output pipe 70 and the case 10. It is discharged to the outside.

As described so far, the variable muffler 100 for a vehicle exhaust system according to an exemplary embodiment of the present invention is the second chamber 22 inside the case 10 through the variable valve 90 in the low RPM oscillation band of the coupe vehicle. ) And the third chamber 23, and the main resonance chamber 41 is formed in the second chamber 22, thereby increasing the exhaust swelling sound in the main resonance chamber 41 to implement the sporty sound of the coupe vehicle. have.

In addition, in the present embodiment, the second chamber 22 and the third chamber 23 inside the case 10 are opened through the variable valve 90 in the high RPM oscillation band of the coupe vehicle so that the main resonance chamber 41 and the main resonance chamber 41 may be opened. By interconnecting the auxiliary resonance chambers 42 in series, it is possible to suppress exhaust booming and increase back pressure to maintain a low noise tone such as a sedan.

Therefore, in the present embodiment, it is effective for tuning the oscillation tone of a coupe vehicle such as a sports car. In particular, a vehicle with a low engine displacement may increase the oscillation booming when the vehicle starts, thereby implementing a tone like a coupe vehicle through the engine.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and various modifications and changes can be made within the scope of the claims and the detailed description of the invention and the accompanying drawings. Naturally, it belongs to the scope of the invention.

Since these drawings are for reference in describing exemplary embodiments of the present invention, the technical idea of the present invention should not be construed as being limited to the accompanying drawings.

1 is a view schematically showing a variable muffler for a vehicle exhaust system according to an exemplary embodiment of the present invention.

2A and 2B schematically illustrate an operating state of a variable muffler for a vehicle exhaust system according to an exemplary embodiment of the present invention.

3 is a graph showing the effect of the operation of the variable muffler for a vehicle exhaust system according to an exemplary embodiment of the present invention.

Claims (3)

A case partitioning an inner space into first, second, and third chambers through first and second partitions, respectively; An exhaust gas input pipe drawn into the front side of the case and supported by the first partition wall and passing through the first chamber to the second chamber; An inner pipe supported by the first and second partition walls in the inner space and extending from the second chamber to a first chamber through a third chamber and a second chamber; An exhaust gas output pipe supported by the first and second partition walls in the internal space and drawn out to the rear side of the case through the first, second and third chambers; And A variable valve installed on the second partition wall to selectively connect the second chamber and the third chamber according to the back pressure inside the second chamber; Variable muffler for vehicle exhaust system comprising a. According to claim 1, The variable valve blocks the second chamber and the third chamber in the low speed region, and the second chamber is configured as a main resonance chamber. The method of claim 2, The variable valve opens the second chamber and the third chamber in a high speed region, wherein the third chamber is configured as an auxiliary resonance chamber interconnected with the second chamber.

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