KR100398158B1 - Muffler - Google Patents

Abstract

The present invention relates to a muffler,

In the conventional muffler, since the exhaust pipe is finally discharged to the atmosphere, the exhaust pipe is composed of one pipe, so when the exhaust pressure of the exhaust gas is small, such as when the engine is idle or at low speed, the discharge pipe is relatively lower than the exhaust pressure. Since it has a large diameter, the discharge booming phenomenon of exhaust gas is generated, the booming noise is transmitted to the vehicle, and the quality of the vehicle is degraded.In addition, when the engine is operated at high speed, the exhaust pipe of the exhaust gas is increased while the exhaust pipe is exhausted. Compared to having a relatively small diameter compared with the exhaust gas passing through the discharge pipe there was a problem that the airflow noise is large.

Therefore, the present invention for solving the above problems is to divide the inlet side of the discharge pipe formed in the case of the 'U' shape to be divided into the first inlet and the second inlet, the outlet and the first inlet of the inlet pipe The first and second valves, which are opened and closed in conjunction with each other on the top of each other, are installed so that the opening amount of the outlet of the inlet pipe and the first inlet of the discharge pipe is varied according to the exhaust pressure of the exhaust gas discharged from the engine. As the low pressure exhaust gas is discharged only through the second inlet of the discharge port, the discharge bouncing of the exhaust gas is reduced to reduce the booming noise transmitted to the inside of the vehicle, and the high pressure exhaust gas is discharged during the high speed operation of the engine. It relates to a muffler that reduces the airflow noise of the exhaust gas by expanding the discharge area as it is discharged through the inlet.

Description

Muffler {Muffler}

The present invention relates to a muffler, and in particular, during engine low-speed operation, the cross-sectional area of the passage through which low-pressure exhaust gas is discharged is reduced, so that the discharge booming of the exhaust gas is reduced, thereby reducing the booming noise transmitted to the inside of the vehicle. The present invention relates to a muffler that reduces the airflow noise of the exhaust gas by enlarging the cross-sectional area of the passage through which the high-pressure exhaust gas is discharged.

In general, the muffler reduces the exhaust noise of the exhaust gas discharged from the engine and emits it to the atmosphere by reducing the exhaust noise.

1 shows a conventional muffler,

A plurality of diaphragms 5 and 6 are installed in the case 1 so that the inside of the case 1 is divided into the first region 7 and the second region 8, and exhaust gas supplied through the exhaust pipe is provided. An inlet pipe 2 leading to the first region 7 is formed at the bottom of the case 1, and a flow tube 3 for moving the exhaust gas of the first region 7 to the second region 8 is partitioned. The discharge pipe 4 which is provided in the middle of (6) and discharges the exhaust gas which moved to the 2nd area | region 8 to air | atmosphere is formed in the upper end of the case 1. As shown in FIG.

In the conventional muffler configured as described above, the exhaust gas supplied to the inlet pipe 2 is moved back to the second region 8 through the flow pipe 3 and then discharged to the atmosphere through the discharge pipe 4.

However, in the conventional muffler, since the exhaust pipe is finally discharged to the atmosphere is composed of a single pipe, when the exhaust pressure of the exhaust gas is small, such as during the idle operation of the engine or low speed operation, the discharge pipe is compared with the exhaust pressure Since it has a relatively large diameter, a discharge booming phenomenon of exhaust gas is generated, and a booming noise is transmitted into the vehicle, resulting in a problem that the quality of the vehicle is deteriorated. Since it has a relatively small diameter compared to the exhaust pressure there was a problem that the airflow noise is generated when the exhaust gas passes through the discharge pipe.

In addition, as described above, it is very difficult to properly set the size of the exhaust pipe because the booming and airflow noise of the exhaust gas is changed according to the size of the discharge pipe. There was a problem.

Therefore, the present invention for solving the above problems is to divide the inlet side of the discharge pipe formed in the case of the 'U' shape to be divided into the first inlet and the second inlet, the outlet and the first inlet of the inlet pipe The first and second valves, which are opened and closed in conjunction with each other on the top of each other, are installed so that the opening amount of the outlet of the inlet pipe and the first inlet of the discharge pipe is varied according to the exhaust pressure of the exhaust gas discharged from the engine. As the low pressure exhaust gas is discharged only through the second inlet of the discharge port, the discharge bouncing of the exhaust gas is reduced to reduce the booming noise transmitted to the inside of the vehicle, and the high pressure exhaust gas is discharged during the high speed operation of the engine. It is an object of the present invention to provide a muffler that reduces the airflow noise of the exhaust gas by expanding the discharge area as it is discharged through the inlet.

The present invention for achieving the above object,

In one side of the case is formed with an inlet pipe for receiving the exhaust gas discharged from the engine, the other side of the case is formed with a discharge pipe for discharging the exhaust gas introduced into the case through the inlet pipe to the outside of the case,

The inlet side of the discharge pipe is formed in a 'U' shape to be separated into a first inlet and a second inlet,

A first valve and a second valve are formed at the outlet of the inlet pipe and the first inlet of the discharge pipe, respectively, to open and close the openings of the inlet pipe and the first inlet of the discharge pipe according to the exhaust pressure of the exhaust gas. It is characterized in that the booming noise and airflow noise is reduced while the gas flow is smooth.

And, the first valve is rotatably axially rotatable on a rotating shaft formed at the upper end of the outlet of the inlet pipe, the rotating shaft is formed with a spring to apply elasticity in the direction of closing the outlet,

The second valve is rotatably installed on the inlet side of the first inlet,

A certain length of the connection between the first valve and the second valve is coupled to the outside by the hinge when the first valve is opened by the exhaust pressure of the exhaust gas characterized in that the second valve is also opened.

In addition, the lower end of the outlet of the inlet pipe is inclined at a predetermined angle to form a hole for discharging low-pressure exhaust gas.

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

2 is a cross-sectional view showing a muffler of the present invention.

3 is a partial cross-sectional view showing the present invention in more detail.

4 is a cross-sectional view showing an operating state of the present invention.

※ Explanation of code for main part of drawing

10 case 11 inlet pipe

12: exit 13: hall

14 discharge pipe 15 first inlet

16: 2nd inlet 18: 1st valve

19: second valve 20: spring

21: connection between 22: hinge

23: locking part

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings, FIGS. 2 to 4.

Reference numeral 10 denotes a case forming the outer shape of the muffler. An inlet pipe 11 for receiving the exhaust gas and flowing into the case 10 is formed at one side of the case 10, and at the other side of the case 10. A discharge pipe 14 for discharging the exhaust gas introduced into the case 10 into the atmosphere is formed.

At this time, the discharge pipe 14 is divided into the inlet side 'U' shape as shown in Figure 2 to be divided into the first inlet 15 and the second inlet 16, the respective inlet ( 15, 16) was configured to discharge the exhaust gas into the atmosphere through the outlet (17).

The first valve 18 and the second valve 19 are installed at the outlet 12 of the inlet pipe 11 and the first inlet 15 of the outlet pipe 14, respectively.

As shown in FIG. 3, the first valve 18 is rotatably coupled to an upper side of the first valve 18 to a rotating shaft 24 formed at an upper end of the front surface of the outlet 12. A spring 20 for applying elasticity in the direction in which the 18 is in close contact with the outlet 12 is formed to reach the upper side of the outlet 12 and the front upper end of the first valve 18.

One side of the spring 20 is inserted into the locking portion 23 formed on the upper surface of the outlet 12, and the other side of the spring 20 is inserted into the locking portion 23 formed on the outer side of the first valve 18 to be separated. It is installed to prevent.

Then, the second valve 19 is rotatably axially supported by the first inlet 15 of the discharge pipe 14 to adjust the opening amount of the first inlet 15 in accordance with the rotation angle.

A separate connection 21 is coupled between the first valve 18 and the second valve 19 so that the first valve 18 and the second valve 19 interlock with each other.

That is, one side of the connecting rod 21 is coupled as a hinge 22 to the bottom outside of the first valve 18, and another side of the connecting rod 21 is hinged to the bottom outside of the second valve 19. When the first valve 18 is opened (rotated counterclockwise), the first valve 19 is also rotated counterclockwise to open the first inlet 15 when the first valve 18 is opened (rotated counterclockwise).

On the other hand, the lower end of the outlet 17 of the inlet pipe 11 was formed by cutting a predetermined angle inclined to form a hole (13).

The hole 13 is a passage through which the low pressure exhaust gas discharged when the engine is idle driven or at low speed is discharged.

Referring to the operation of the present invention configured as described above is as follows.

First, when the engine is idle driven or low speed driven, the pressure of the exhaust gas discharged from the engine becomes a low pressure state.

Therefore, the low pressure exhaust gas flowing into the inlet pipe 11 is not pushed out of the first valve 18 but is discharged into the case 10 through the hole 13 formed at the lower end of the outlet 12.

At this time, as the first valve 18 is closed, the second valve 19 connected by the connecting rod 21 also closes the first inlet 15 as shown in FIG. The exhaust gas introduced into the case 10 through 13 is discharged only through the second inlet 16 of the discharge pipe 14.

That is, when the exhaust pressure of the exhaust gas is small, as the exhaust gas is discharged only through the second inlet 16, the flow passage of the exhaust gas is reduced, thereby reducing the booming noise of the exhaust gas.

On the other hand, when the engine is driven at high speed, the pressure of the exhaust gas discharged from the engine is in a high pressure state.

Therefore, the high pressure exhaust gas flowing into the inlet pipe 11 hits the first valve 18 and the first valve 18 overcomes the elasticity of the spring 20 and rotates counterclockwise as shown in FIG. 4. As the first valve 18 rotates counterclockwise, the second valve 19 connected by the connecting rod 21 also opens the first inlet 15 while rotating counterclockwise.

Accordingly, the high-pressure exhaust gas introduced into the inlet pipe 11 is discharged to the atmosphere through the first inlet 15 and the second inlet 16 of the discharge pipe 14, so that the exhaust gas is discharged accordingly The cross-sectional area of the is widened so that the airflow noise of the exhaust gas is reduced.

As described above, the present invention divides the inlet side of the discharge pipe formed inside the case into a 'U' shape so as to be divided into a first inlet and a second inlet, and on the outlet and the first inlet of the inlet pipe. By installing the first and second valves that open and close in conjunction with each other, the opening amount of the outlet of the inlet pipe and the first inlet of the discharge pipe is varied according to the exhaust pressure of the exhaust gas discharged from the engine. As the gas is discharged only through the second inlet of the discharge port, the discharge bouncing of the exhaust gas is reduced, thereby reducing the booming noise transmitted to the inside of the vehicle, and during the high speed operation of the engine, the high-pressure exhaust gas is discharged through the first and second inlets. As it is discharged, the effect of providing a muffler to reduce the airflow noise of the exhaust gas by expanding the discharge area can be expected.

Claims (3)

An inlet pipe 11 for receiving the exhaust gas discharged from the engine is formed at one side of the case 10, and the exhaust gas introduced into the case 10 through the inlet pipe 11 at the other side of the case 10. In the discharge pipe 14 for discharging the outside of the case 10 is formed, The inlet side of the discharge pipe 14 is formed in a 'U' shape so as to be separated into the first inlet 15 and the second inlet 16, A first valve 18 and a second valve 19 are formed at the outlet 12 of the inlet pipe 11 and the first inlet 15 of the discharge pipe 14 to open and close with each other to exhaust the exhaust pressure of the exhaust gas. The openings of the outlet 12 of the inlet pipe 11 and the first inlet 15 of the discharge pipe 14 are varied according to the present invention, so that the flow of the exhaust gas is smooth, and the booming noise and airflow noise are reduced. Muffler. The method of claim 1, The upper side of the first valve 18 is rotatably rotatably supported by a rotation shaft 24 formed at an upper end of the outlet 12 of the inlet pipe 11, and the first valve 18 is connected to the rotation shaft 24 by an outlet ( 12 is formed a spring 20 for applying elasticity in the closing direction, The second valve 19 is rotatably installed at the inlet side of the first inlet 15, Couplings 21 of a certain length are coupled to the outside of the first valve 18 and the second valve 19 as hinges 22 so as to interlock when the first valve 18 is opened by the exhaust pressure of the exhaust gas. Muffler, characterized in that also opening the second valve (19). The method of claim 1, Muffler, characterized in that for forming a hole 13 for discharging low-pressure exhaust gas by cutting the lower end of the outlet 12 of the inlet pipe 11 at an angle.