KR101251658B1 - A variable type exhaust pipe system for controlling exhaust noise - Google Patents

Abstract

The present invention relates to a variable exhaust pipe system for controlling exhaust noise, comprising: an inlet pipe connected to an exhaust manifold to which exhaust gas is introduced; A main exhaust pipe installed at a position opposite to the inflow pipe and connected to the inflow pipe, through which the exhaust gas is discharged; A sub exhaust pipe installed on one side of the main exhaust pipe to discharge exhaust gas flowing from the main exhaust pipe; A pipe connection part installed between the main exhaust pipe and the sub exhaust pipe so as to be connected to each other; A plurality of exhaust holes are formed at one side to block the inside of the main exhaust pipe and allow the exhaust gas to pass, and the other side is installed to block the pipe connection part, and a flow path for opening and closing the pipe connection part according to the flow amount of the exhaust gas. Variable member; And a muffler installed on one side of the pipe connection part and provided in an opening direction of the flow channel variable member, the muffler having an elastic member elastically supporting the flow path variable member. To provide. Therefore, when the engine operates at a low speed, the exhaust gas is discharged to one exhaust pipe, and when the engine is operated at a high speed, the exhaust gas is discharged to the two exhaust pipes, thereby effectively controlling the noise caused by the exhaust gas emissions. .

Muffler, main exhaust pipe, sub exhaust pipe, pipe connection, flow path variable member, elastic member, exhaust noise control, variable

Description

A variable type exhaust pipe system for controlling exhaust noise}

1 is a simplified diagram illustrating a muffler of the present invention.

Figure 2 is a schematic diagram showing the interior of the muffler during low speed operation of the engine according to the present invention.

Figure 3 is a schematic diagram showing the interior of the muffler during high speed operation of the engine according to the present invention.

4 is a graph showing the noise trend of the variable exhaust pipe system according to the present invention.

DESCRIPTION OF THE REFERENCE NUMERALS

  1: muffler 10: body

100: inlet pipe 200: main exhaust pipe

300: sub exhaust pipe 400: pipe connection

500: flow path variable member 510: main plate

512: exhaust hole 520: subplate

530: support plate 600: elastic member

700: elastic member receiving portion

The present invention relates to a variable exhaust pipe system for controlling exhaust noise, and more particularly, a muffler capable of varying an exhaust gas flow path so that exhaust gas is discharged to one or two exhaust pipes according to an engine operating speed. A variable exhaust pipe system for exhaust noise control provided.

The muffler is a mechanism for reducing noise from an internal combustion engine or a ventilator. It is shaped like a metal cylinder or a rectangular box.

Increasing the noise reduction effect of the muffler increases the resistance to the exhaust flow, which reduces the output of the engine. Therefore, it is necessary to use a muffler having a suitable performance so as to have a proper noise reduction efficiency within a range that does not reduce the engine output.

It is generally advantageous to use a small diameter exhaust gas exhaust pipe because the exhaust flow is low when the engine is rotating at low speeds. At high speeds, on the contrary, large diameter exhaust pipes are needed to prevent noise and power losses from increasing exhaust gases.

However, since the diameter of the exhaust pipe cannot be varied according to the number of revolutions of the engine, a conventional muffler is used to open and close the variable valve according to the engine speed by using a variable valve in the exhaust pipe.

However, there is a problem such as the opening and closing noise generated when opening and closing the variable valve and the durability performance of the variable valve, which requires a new type of muffler structure.

An object of the present invention is to provide a variable exhaust pipe system for exhaust noise control that can control the exhaust noise by varying the exhaust gas discharge passage in accordance with the operating speed of the engine.

In order to achieve the above object, the present invention is connected to the exhaust manifold inlet pipe inlet exhaust gas; A main exhaust pipe installed at a position opposite to the inflow pipe and connected to the inflow pipe, through which the exhaust gas is discharged; A sub exhaust pipe installed on one side of the main exhaust pipe to discharge exhaust gas flowing from the main exhaust pipe; A pipe connection part installed between the main exhaust pipe and the sub exhaust pipe so as to be connected to each other; A plurality of exhaust holes are formed at one side to block the inside of the main exhaust pipe and allow the exhaust gas to pass, and the other side is installed to block the pipe connection part, and a flow path for opening and closing the pipe connection part according to the flow amount of the exhaust gas. Variable members; And a muffler installed on one side of the pipe connection part and provided in an opening direction of the flow channel variable member, the muffler having an elastic member elastically supporting the flow path variable member. To provide.

The flow path variable member may include a main plate blocking the inside of the main exhaust pipe to allow exhaust gas to pass through, a sub plate bent from an end of the main plate to block the pipe connection portion, and a bent from an end of the main plate. The support plate is positioned to face the sub plate and is supported by the elastic member, and the sub plate, the support plate, and the main plate form a 'T' shape.

The flow path variable member is pushed by a strong exhaust flow during high speed operation of the engine to open the pipe connection part, and is returned to its original position by the elastic member during low speed operation of the engine to close the pipe connection part.

The coupling part of the main exhaust pipe and the pipe connection part is formed to be rounded so as to prevent vortex from occurring when the exhaust gas flows into the pipe connection part.

The outer side of the main exhaust pipe is characterized in that the inverse 'c'-shaped elastic member receiving portion for receiving the elastic member is formed.

Hereinafter, a variable exhaust pipe system for controlling exhaust noise according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a schematic diagram illustrating a muffler of the present invention, and FIG. 2 is a schematic diagram showing the interior of the muffler during low speed operation of the engine according to the present invention. In addition, Figure 3 is a schematic diagram showing the interior of the muffler during high speed operation of the engine according to the present invention, Figure 4 is a graph showing the noise trend of the variable exhaust pipe system according to the present invention.

As shown in Figs. 1 to 3, the variable exhaust pipe system of the present invention is implemented by a muffler 1 which is variable so that one or two exhaust pipes can be used according to the rotational speed of the engine. The noise according to the rotational speed of the engine can be properly controlled.

As shown in FIG. 1, the muffler 1 of the present invention includes a main body 10, an exhaust gas inflow pipe 100 connected to one side of the main body 10, and a main connected to the other side of the main body 10. It comprises an exhaust pipe 200 and the sub exhaust pipe 300.

As shown in FIG. 2 and FIG. 3, the pipe connection part 400 connecting the main exhaust pipe 200 and the sub exhaust pipe 300 and the sub exhaust pipe 300 are opened and closed within the main body 10. The flow path variable member 500, an elastic member 600 for elastically supporting the flow path variable member 500, and an elastic member receiving part 700 for accommodating the flow path variable member 500 are provided.

The inlet pipe 100 is a passage through which the exhaust gas is introduced and connected to the exhaust manifold so that the exhaust gas discharged through the exhaust manifold passes through the muffler 1.

The main exhaust pipe 200 is installed on the opposite side of the main body 10 of the muffler 1 in which the inflow pipe 100 is formed, and exhaust gas is discharged to the outside of the vehicle.

The sub exhaust pipe 300 is installed in the lateral direction of the main exhaust pipe 200 and is connected to the main exhaust pipe 200 by the pipe connection 400.

The sub exhaust pipe 300 maintains a state in which the exhaust gas is not discharged by closing the pipe connection part 400 by the flow path variable member 500 when the engine rotates at a low speed. On the contrary, when the engine rotates at a high speed, the pipe connecting part 400 is opened by the flow path variable member 500 so that the exhaust gas is introduced to the outside of the vehicle through the sub exhaust pipe 300 together with the main exhaust pipe 200. Discharged.

The pipe connection unit 400 is installed between the main exhaust pipe 200 and the sub exhaust pipe 300 to connect the main exhaust pipe 200 and the sub exhaust pipe 300 to communicate with each other.

As shown in part A of FIGS. 2 and 3, a portion where the pipe connecting portion 400 and the main exhaust pipe 200 are connected is preferably formed to be round. When the exhaust gas flows from the main exhaust pipe 200 into the pipe connection 400, when the corner of the connection A is angled, vortex may occur and prevent the exhaust gas from entering the pipe connection 400. Because there is.

The flow path variable member 500 may include a main plate 510 installed to block the inside of the main exhaust pipe 200, a sub plate 520 installed perpendicular to the main plate 510 to form a 'T' shape, and It consists of a support plate 530.

The main plate 510 is installed across the inside of the main exhaust pipe 200, and a plurality of exhaust holes 512 are formed in the plate surface. Although the main plate 510 blocks the inside of the main exhaust pipe 200, exhaust gas may pass through the main plate 510 through the exhaust hole 512.

The sub plate 520 is bent at a right angle from an end of the main plate 510 to extend toward the pipe connection 400 and block the pipe connection 400. The sub plate 520 opens the pipe connection part 400 when the main plate 510 is pushed in the exhaust gas discharge direction by the exhaust gas. The support plate 530 is formed on the opposite side of the sub plate 520.

The support plate 530 is bent at a right angle from an end of the main plate 510 so as to face the sub plate 520. The end of the support plate 530 is preferably bent to a predetermined length so as to be easily supported by the elastic member 600.

The elastic member 600 is fixed to the elastic member accommodating part 700 while the elastic member 600 is accommodated in the elastic member accommodating part 700 formed on the outer side of the main exhaust pipe 200, and the other side is fixed to the support plate 530.

The elastic member 600 is compressed by the subplate 520 when the main plate 510 is pushed in the discharge direction of the exhaust gas by the strong exhaust flow to allow the subplate 520 to open the pipe connection 400 ( 3). On the contrary, if there is no strong exhaust flow, it is elastically restored to push the supporting plate 530 so that the subplate 520 closes the pipe connection 400 (see FIG. 2).

In the variable exhaust pipe system for controlling the exhaust noise according to an embodiment of the present invention having such a configuration, the exhaust noise control process according to the operating speed of the engine will be briefly described as follows.

As shown in FIG. 4, when only one exhaust pipe (main exhaust pipe 200) is used at an engine speed of 3000 RPM or less, it is effective to reduce noise. When the engine speed is 3000 RPM or more, two exhaust pipes (main It can be seen that exhausting the exhaust gas using both the exhaust pipe 200 and the sub exhaust pipe 300 is effective for noise reduction.

To implement this, first look at the internal state of the muffler when the engine is running at low speed.

As shown in FIG. 2, the exhaust gas discharged from the exhaust manifold is introduced into the muffler 1 through the inlet pipe 100.

In this case, the introduced exhaust gas should be discharged to the outside through the main exhaust pipe 200. The reason for this is that when the engine is operated at low RPM, most of the noise is a low frequency booning component, so in order to eliminate the exhaust gas, the main plate 510 of the flow path variable member 500 installed in the main exhaust pipe 200. Because you have to pass).

Since the engine operates at a low speed, the exhaust gas does not flow so strongly as to affect the position of the flow path variable member 500, so that the flow path variable member 500 maintains its original installation position.

To this end, the elastic member 600 preferably has an elastic force such that the sub-plate 520 does not push even in the flow of the exhaust gas discharged during the low speed operation of the engine, which can be determined by experiment. As the exhaust gas passes through the exhaust hole 512, the tuning frequency becomes a low frequency, and noise due to exhaust gas emission is attenuated.

Next, the internal state of the muffler when the engine is rotating at high speed is as follows.

As shown in FIG. 3, the exhaust gas discharged from the exhaust manifold is introduced into the muffler 1 through the inlet pipe 100.

In this case, the introduced exhaust gas should be discharged to the outside through the main exhaust pipe 200 and the sub exhaust pipe 300. The reason is that when the engine is operated at a high RPM, a strong exhaust flow occurs, so that when the exhaust gas is discharged only to the main exhaust pipe 200, the passage area is small compared to the flow rate and the noise is increased.

Since the engine operates at a high speed to increase the exhaust gas amount and speed, the main plate 510 of the flow path variable member 500 installed inside the main exhaust pipe 200 is pushed in the exhaust gas discharge direction.

As the main plate 510 is pushed, the subplate 520 pushes the elastic member 600, thereby opening the pipe connection 400 as the subplate 520 is pushed. A portion of the exhaust gas introduced into the main exhaust pipe 200 through the open pipe connection 400 moves to the sub exhaust pipe 300 to exhaust gas to both the main exhaust pipe 200 and the sub exhaust pipe 300. Is discharged. As a result, the tuning frequency is shifted toward the higher frequencies, whereby high frequency noise can be attenuated appropriately.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. And such changes are within the scope of the appended claims.

As described above, the variable exhaust pipe system for controlling exhaust noise according to an embodiment of the present invention allows exhaust gas to be discharged to one exhaust pipe when the engine operates at low speed, and when the engine operates at high speed, By discharging the exhaust gas into the two exhaust pipes, it is possible to effectively control the noise caused by the exhaust gas.

In addition, since the exhaust flow is automatically divided into two exhaust pipes by the strong exhaust flow during high speed operation of the engine, there is an advantage that the effective noise control can be achieved by simple structural addition to the muffler.

Claims (5)

An inlet pipe 100 connected to the exhaust manifold and into which the exhaust gas is introduced; A main exhaust pipe (200) installed at a position opposite to the inflow pipe (100) and connected to the inflow pipe (100), through which the exhaust gas is discharged; A sub exhaust pipe (300) installed at one side of the main exhaust pipe (200) to exhaust the exhaust gas flowing from the main exhaust pipe (200); A pipe connection unit 400 installed between the main exhaust pipe 200 and the sub exhaust pipe 300 so as to be connected to each other; A plurality of exhaust holes 512 are formed at one side to block the inside of the main exhaust pipe 200 and allow the exhaust gas to pass therethrough, and the other side is installed to block the pipe connection 400, and the flow amount of the exhaust gas is blocked. Flow passage variable member 500 for opening and closing the pipe connection 400 according to; And It is installed on one side of the pipe connecting portion 400 is installed in the direction of the flow path variable member 500 includes a muffler (1) provided with an elastic member 600 for elastically supporting the flow path variable member 500, , The flow path variable member 500 may be bent from an end of the main plate 510 to block the inside of the main exhaust pipe 200 to allow exhaust gas to pass therethrough, and the pipe connection part 400. And a support plate 530 which is bent from an end of the main plate 510 and is positioned to face the sub plate 520 and is supported by the elastic member 600. And the sub plate 520 and the support plate 530 and the main plate 510 form a 'T' shape with each other. delete The method of claim 1, The flow path variable member 500 is pushed by a strong exhaust flow during high speed operation of the engine to open the pipe connection part 400, and returns to its original position by the elastic member 600 during low speed operation of the engine. Variable exhaust pipe system for exhaust noise control, characterized by closing 400). The method of claim 1, The coupling part of the main exhaust pipe 200 and the pipe connection part 400 is exhaust noise, characterized in that it is formed rounded to prevent the vortex generated when the exhaust gas flows into the pipe connection 400 Variable exhaust pipe system for control. The method of claim 1, Variable exhaust pipe system for the exhaust noise control, characterized in that the outer side of the main exhaust pipe 200, the elastic member receiving portion 700 of the inverse '-' shape for receiving the elastic member 600 is formed.

Images