KR19990027087U - Automotive Silencer - Google Patents

Abstract

The present invention is to provide a silencer for automobile that can maintain the quietness in the low speed section and increase the output of the engine in the high speed section by changing the flow of exhaust gas in accordance with the output of the engine. This is the exhaust gas combusted in the cylinder of the engine is introduced through the catalytic converter, the first noise pipe 34 having a branch 36 and the discharge port 38, and the branch of the first noise pipe 34 The second noise pipe 44 through which the exhaust gas flows through the 36, and the exhaust gas passing through the second noise pipe 44 flows in, while the outlet 38 of the first noise pipe 34 is opened. In the automobile silencer provided with the third noise pipe 46 through which the exhaust gas of the engine is introduced, the exhaust port 38 of the first noise pipe 34 moves up and down in accordance with the negative pressure of the exhaust gas. ) Has a structure in which a floater 60 for opening and closing a) is mounted.

Description

Automotive Silencer

The present invention relates to a vehicle silencer, and more particularly, by changing the flow of exhaust gas in accordance with the output of the engine, it is possible to maintain quietness in the low speed section and to increase the engine output in the high speed section. It is about.

In general, when the exhaust gas of a vehicle is classified according to the emission source, the exhaust gas of the fuel and air mixture is combusted in a cylinder and then released into the atmosphere through an exhaust pipe, and the evaporation gas and piston from which gasoline in the fuel tank is evaporated. The gap between the cylinder wall and the cylinder can be divided into a blow-by gas in which the combustion chamber's mixer or unburned gas flows into the crankcase.

Among them, the exhaust gas discharged from the engine through the exhaust manifold contains a large number of harmful gases, and in order to prevent environmental pollution, these harmful gases are treated by a catalytic converter before being released into the atmosphere and are harmless. Should be converted to and released.

1 is a cross-sectional view showing the structure of a conventional silencer. Exhaust gas discharged from the cylinder is introduced into the catalytic converter through the exhaust pipe as the exhaust valve is opened. The catalytic converter removes harmful substances contained in the exhaust gas by redox reaction. The exhaust gas passing through the catalytic converter flows into the silencer 10 as shown in FIG. 1 through the exhaust pipe.

The silencer 10 shown here is an indirect reflective composite silencer, in which a plurality of first to third noise pipes 20, 22 and 24 of different lengths are built-in, and the space portion is formed by the partition walls 26 and 28. Is filled with a sound absorbing material. The exhaust gas introduced through the first noise pipe 14 is discharged through the branch port 16 formed in the first noise pipe 14 in the low speed section of which the engine output is low, and then the second noise pipe 22 in the upper portion. ) Is discharged to the rear pipe through the third sound pipe (24).

In addition, the first noise pipe 14 is provided with an on-off valve 20 that opens as shown by a virtual line along the guide shaft 18. Since the opening / closing valve 20 is closed in a section in which the rotational region of the engine is low speed, the exhaust gas flowing into the first noise pipe 14 passes through the branch opening 16 along the arrow shown in solid line in the upper second. It is discharged to the outside via the sound pipe 22 and the third noise pipe 24 in order. Next, in the section where the rotational area of the engine is high speed, the on-off valve 20 is opened by the back pressure, so that the exhaust gas flowing into the first noise pipe 14 is opened and closed on the valve 20 including the branch port 16. ) Is also discharged to the outside through the third sound pipe 24 in the direction shown by the dotted line. While the exhaust gas is discharged to the outside through these sound pipes 20, 22 and 24, the noise and sound vibration are attenuated and then discharged to the outside through the rear pipe.

In the conventional automobile silencer having such a configuration, the on-off valve is installed at one end of the first noise pipe to control the flow of exhaust gas according to the rotational area of the engine. Therefore, there is a problem that the noise is generated.

The present invention is to solve these problems, the purpose of which is to install a floater which is raised by the pressure of the exhaust gas in the first noise pipe can maintain quietness in the low speed region of the engine and increase the output of the engine in the high speed region To provide a car silencer that can be made.

1 is a cross-sectional view showing a conventional automobile silencer

2 is a cross-sectional view showing a silencer for automobiles according to the present invention

3 is an enlarged view of a portion A of FIG. 2;

[Explanation of symbols on the main parts of the drawings]

30: Silencer 32: Shell

34: 1st sound pipe 36: branch apparatus

38: outlet 40: stopper

44: second noise pipe 46: third noise pipe

48, 50: bulkhead 60: plotter

62: buffer

An object of the present invention described above is that exhaust gas combusted in a cylinder of an engine is introduced through a catalytic converter, and the exhaust gas is introduced through a first noise pipe having a branch port and an exhaust port, and a branch port of the first noise pipe. In the silencer for automobile provided with the 2nd noise tube which becomes a 2nd noise tube which flows in through the 2nd noise tube, and the exhaust gas of the engine also flows in through the exhaust port of a 1st noise tube, The discharge port of the first noise pipe is achieved by a vehicle silencer, which is equipped with a floater for opening and closing the discharge port while moving up and down according to the negative pressure of the exhaust gas.

Next, with reference to the accompanying Figure 2 will be described for the vehicle silencer according to a preferred embodiment of the present invention.

Figure 2 is a cross-sectional view showing a silencer for a vehicle according to the present invention, Figure 3 is an enlarged view of a portion A of FIG.

First, similarly to the conventional structure shown in FIG. 1, the silencer 30 employed in the present invention is an indirect reflective composite silencer, in which a plurality of first to third noise pipes 34, 44, and 46 having different lengths are incorporated. A sound absorbing material is filled in the space portion by the partitions 48 and 50. Exhaust gas introduced through the first noise pipe 34 is discharged through the branch hole 36 formed in the first noise pipe 34 in the low speed section of the engine low output, and then the second noise pipe 44 of the upper portion. After being supplied to) is discharged to the outside through the third sound pipe (46).

In the silencer 30 having such a configuration, a method for improving the quietness in the low speed section and increasing the output in the high speed section by changing the flow flow of the exhaust gas according to the rotational speed of the engine. The floater 60 was attached to the outlet 38 of 34).

Here, as shown in FIG. 3, the inner wall of the discharge port 38 is formed with a stopper 40 extending radially inward to support the lower end of the plotter 60. In addition, at the upper end of the discharge port 38, a locking end 38a is formed to prevent the floater 60 from rising above a certain height.

In order to prevent joints that may be generated in the process of raising the floater 60 due to the pressure of the exhaust gas flowing through the first noise pipe 34, a cushioning material 62 is fitted to the outer circumferential portion of the plotter 60. Let go. The shock absorbing material 62 prevents a direct collision with the locking end 38a in the process of raising the plotter 60, and prevents the splice, while the lower end of the plotter 60 directly collides with the stopper 40 when descending. It has the function to prevent the connection by preventing it.

In the silencer 30 having such a configuration, since the plotter 60 is attached to the outlet 38 of the first noise pipe 34 in the section where the engine rotation region is at a low speed, the first noise pipe 34 Exhaust gas introduced through) is discharged to the outside via the second noise pipe 44 and the third noise pipe 46 in order along the arrow shown by the solid line through the branch port 36 in order.

Next, in the section in which the rotation region of the engine is a high speed, the discharge port 38 is opened while the floater 60 is raised by the back pressure. Accordingly, the exhaust gas introduced into the first noise pipe 34 is discharged to the outside through the third noise pipe 46 along the direction shown by the dotted line also through the branch outlet 36 and the open discharge hole 38. . Noise and sound vibrations are attenuated while the exhaust gas is discharged to the outside through these sound pipes 34, 44 and 46, and then discharged to the outside through the rear pipe.

According to the present invention described above, by using the floater installed in the first noise pipe which is raised by the pressure of the exhaust gas, the quietness can be maintained in the low speed region of the engine and the output of the engine can be increased in the high speed region. By employing a simple plotter, there is an advantage that the cost can be reduced.

Claims (3)

The exhaust gas combusted in the cylinder of the engine is introduced through the catalytic converter, and includes a first noise pipe 34 having a branch port 36 and an outlet port 38, and a branch hole of the first noise pipe 34. The second noise pipe 44 through which the exhaust gas flows through the 36 and the exhaust gas passing through the second noise pipe 44 flows in, and the outlet 38 of the first noise pipe 34 is opened. In the silencer for automobile provided with a third noise pipe 46 through which the exhaust gas of the engine flows, A silencer for automobiles, characterized in that the discharge port (38) of the first noise pipe (34) is mounted to open and close the discharge port (38) while moving up and down according to the negative pressure of the exhaust gas. The method of claim 1, The lower end of the floater 60 is supported by a stopper 40 attached to the inner wall of the discharge port 38, the upper end is caught by the engaging end (38a) is characterized in that it is suppressed to rise above a certain degree. Car silencer. The method of claim 1, A silencer for automobiles, characterized in that a cushioning material 62 is fitted to an outer circumferential portion of the plotter 60.