KR20050099321A - Exhaust silencer of internal combustion engine - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust silencer of an internal combustion engine, and more particularly to an exhaust silencer provided with a noise guide having a noise rotating section for rotating exhaust noise from an engine.

Description

EXHAUST SILENCER OF INTERNAL COMBUSTION ENGINE

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust silencer of an internal combustion engine, and more particularly to an exhaust silencer provided with a noise guide having a noise rotating section for rotating exhaust noise from an engine.

Recently, various exhaust silencers have been proposed for attenuating exhaust noise of internal combustion engines.

One example is an exhaust silencer 1 as shown in FIG.

The exhaust silencer 1 is provided with an inlet pipe 3 for inflow of exhaust gas by connecting to an exhaust pipe (not shown) on the front side of the cylindrical housing 2, and on the opposite side of the inlet pipe 3. Via (2), a discharge pipe 4 for discharging the exhaust gas whose temperature and pressure are reduced to reduce noise to the atmosphere is provided.

In addition, a plurality of partitions 5 and 6 are installed inside the housing 2 to form a plurality of chambers 7 and 8, and the partitions 5 and 6 are provided with flow pipes 9 and 10, respectively. By connecting the chambers (7, 8) of the exhaust gas is configured to flow.

However, such a conventional exhaust silencer reduces the temperature and pressure of the exhaust gas while reducing the noise while passing the respective chambers through the flow pipe, but requires a large number of partitions and pipes. This is complicated and expensive to manufacture.

Therefore, in order to solve the above problems, the present invention can attenuate exhaust noise by using a noise guide provided with a noise rotating unit instead of a plurality of partitions and pipes, and thus can be manufactured at a lower cost and manufacturing process than the conventional one. An object of the present invention is to provide an exhaust silencer.

In order to achieve the above object, the exhaust silencer according to the present invention is provided with a noise inlet hole and a noise outlet on both sides so that exhaust noise from the exhaust port of the internal combustion engine is discharged to the outside; And a noise guide installed at the noise inflow hole side of the body and having a noise rotating part to rotate and attenuate exhaust noise discharged through the exhaust port.

In addition, the noise attenuation pipe extending inwardly from the noise outlet of the body and having a noise inlet of a predetermined diameter on the opposite side of the noise outlet for further attenuating exhaust noise introduced into the body through the noise guide. It includes more.

In addition, the noise attenuation pipe has a plurality of noise inlets on the opposite side of the noise outlet.

In addition, a guard having an inclined surface is provided on the side of the noise inlet so that exhaust noise rotating through the noise guide does not directly enter the noise inlet.

In addition, a plurality of protrusions are formed on the surface of the noise damping pipe.

In addition, the body further has an auxiliary noise attenuation pipe formed on the outside of the noise attenuation pipe, the auxiliary noise inlet on the opposite side of the noise inlet of the noise attenuation pipe.

In addition, the noise guide is made of a conical shape, the noise rotating portion is formed of a plurality of spiral grooves on the surface of the cone-shaped noise guide.

In addition, the noise guide is made of a drum type, the noise rotating portion is formed of a plurality of wings in the drum-type noise guide.

Hereinafter, with reference to the drawings will be described a preferred embodiment of the present invention.

1 is a longitudinal sectional view of an exhaust silencer according to a first embodiment of the present invention in which a conical noise guide is installed. FIG. 2 is a front sectional view taken along the portion A-A of FIG. 1. 3 is a front sectional view taken along the portion B-B of FIG. 1. 4 is a perspective view showing a modification of the noise attenuation tube. 5 is a cross-sectional view showing yet another modified example of the noise damping pipe. 6 is a longitudinal sectional view of the exhaust silencer according to the second embodiment of the present invention, in which a drum type noise guide is installed. 7 is a front sectional view taken along the portion C-C of FIG. 6. FIG. 8 is a front sectional view taken along the portion D-D of FIG. 6. 9 is a cross-sectional view of the exhaust silencer of the prior art.

(Example 1)

As shown in FIG. 1, the exhaust silencer 100 according to the first embodiment of the present invention includes a body 120 in which noise inlet holes 122a and noise outlet holes 122b are installed at both sides, and the body. Noise guide 140 for rotating and attenuating exhaust noise drawn through the noise inlet hole 122a of 120 and noise for further attenuating exhaust noise proceeding while rotating by the noise guide 140. It is comprised by the damping pipe 160.

In the body 120, the noise inlet hole (122a) is connected to the engine (not shown) exhaust port to receive the exhaust noise from the engine.

Exhaust noise introduced through the noise inflow hole 122a is attenuated while rotating by the wedge-shaped noise guide 140. That is, the noise guide 140 may be attenuated while rotating along the grooves (ie, the noise rotating part) 142 that are formed in plural in a spiral manner.

More specifically, since a plurality of spiral grooves 142 are formed on the surface of the wedge-shaped noise guide 140 installed in the body 120 by the support 146, as shown in FIG. Proceeding along the surface of the guide 140 and attenuated while rotating at a predetermined angle in the noise rotating portion (a plurality of spiral grooves) 142.

That is, the exhaust noise immediately before the conical noise guide 140 is in a straight state, but the exhaust noise immediately after the conical noise guide 140 may be rotated at an angle so that the exhaust noise before the first noise guide 140 is introduced. It can significantly reduce its intensity rather than noise. Therefore, the same effects as those using a large number of conventional partition walls and pipes can be obtained.

Referring to FIG. 2 again, the support 146 serves not only to support the noise guide 140 but also to create a predetermined entry space to allow exhaust noise to pass between the body 120 and the noise guide 140. Also perform.

The exhaust noise introduced through the entry space between the noise guide 140 and the body 120 proceeds while rotating toward the noise outlet hole 122b along the inner wall of the body 120 and then again at a dead end in the body 120. While rotating along the outer wall of the damping pipe 160, the noise is introduced into the noise inlet 162 installed in the noise damping pipe 160 and finally discharged to the outside through the noise outlet hole 122b.

The exhaust noise traveling path in the noise attenuation pipe 160 is shown in FIG.

As shown in the figure, the exhaust noise proceeds while rotating is introduced into the noise attenuation pipe 160 is discharged to the outside.

Next, the noise attenuation tube may have a modified form as shown in FIGS. 4 and 5.

First, in the noise attenuation pipe 160 ′ of FIG. 4, a plurality of noise inlets 162 ′ are formed on one surface thereof, and a guard 164 ′ having an inclined surface is additionally installed at the noise inlet 162 ′ side. have. The guard 164 'is installed to prevent the powerful exhaust noise passing through the noise guide 140 from being directly introduced into the noise inlet 162' of the noise attenuation pipe 160 '.

Next, in the noise attenuation pipe 160 ″ of FIG. 5, a plurality of noise attenuation protrusions 166 are provided on the surface. Of course, the plurality of protrusions 166 may be a noise attenuation pipe 160 or a noise attenuation pipe. It may be installed at 160 '.

(Example 2)

An exhaust silencer 200 according to a second embodiment of the present invention will be described with reference to FIG. 6.

As shown in FIG. 6, the exhaust silencer 200 according to the second embodiment of the present invention has a body in which the noise inlet hole 222a and the noise outlet hole 222b are installed at both sides similarly to the first embodiment. 220, a drum-type noise guide 240 for rotating and attenuating exhaust noise introduced through the noise inlet hole 222a of the body 220, and exhaust noise passing through the noise guide 240. The attenuating pipe 260 for attenuating additionally, and the auxiliary attenuating pipe 280 for attenuating the noise before the attenuating pipe 260 is installed outside the attenuating pipe 260. .

Exhaust noise introduced through the noise inlet hole 222a travels along the V-shaped portion of the noise guide 240 and is rotated by a plurality of wings 242 configured in a drum shape. In more detail, as shown in FIG. 7, it is possible to attenuate while rotating by a plurality of sound rotating parts (a plurality of wing parts) 242 installed in the drum type noise guide 240.

Next, the exhaust noise passing through the wing 242 of the noise guide passes through the noise guide 240 and is discharged to the outside. That is, in the first embodiment, the rotation is attenuated while rotating along the noise guide surface, while in the second embodiment, the rotation is attenuated while passing through the noise guide. Of course, the role of the noise guide is to attenuate by exhaust exhaust noise, the term 'noise guide' described in this specification is to rotate the exhaust noise along the surface of the noise guide or whether it passes through the noise guide. It is intended to include all rotating members for damping.

Referring back to FIG. 6, the exhaust noise rotated through the noise guide 240 rotates along the outer wall of the auxiliary noise attenuation pipe 280 and the inner wall of the body 220, and is installed in the auxiliary noise attenuation pipe 280. It is to be introduced into the auxiliary noise inlet (282a, 282b).

Exhaust noise introduced through the auxiliary noise inlets 282a and 282b proceeds in the direction of the noise inlet hole 222a along the inner wall of the auxiliary noise attenuation pipe 280 and the outer wall of the noise attenuation pipe 260, and then the noise attenuation pipe 260. Inlet to the noise inlet 262 is installed in the) and is finally discharged to the outside through the noise outlet (222b). In more detail, as shown in FIG. 8, exhaust noise may be further attenuated while sequentially passing through the auxiliary noise attenuation pipe 280 and the noise attenuation pipe 260.

As will be appreciated by those skilled in the art, the auxiliary noise attenuation pipe 280 may also be applied to the first embodiment, and the noise guide 240 may be used instead of the noise guide 140.

As described above, in the exhaust silencer according to the present invention, instead of a plurality of partitions and pipes as in the prior art, the exhaust noise is attenuated using a noise guide, so that the exhaust silencer can be manufactured at a lower cost and manufacturing process than in the prior art.

Although the present invention has been particularly shown and described with reference to the above-described embodiments, it will be understood by those skilled in the art that the present invention is not limited thereto but can be variously modified and modified.

1 is a longitudinal sectional view of an exhaust silencer according to a first embodiment of the present invention in which a conical noise guide is installed;

2 is a front sectional view taken along the portion A-A of FIG.

3 is a front sectional view taken along the portion B-B of FIG.

4 is a perspective view showing a modification of the noise attenuation pipe.

5 is a cross-sectional view showing yet another modification of the noise attenuation pipe.

6 is a longitudinal sectional view of the exhaust silencer according to the second embodiment of the present invention, in which a drum type noise guide is installed;

FIG. 7 is a front sectional view taken along the portion C-C of FIG. 6.

FIG. 8 is a front sectional view taken along the portion D-D of FIG. 6.

9 is a cross-sectional view of the exhaust silencer of the prior art.

Explanation of symbols on main parts of drawing

1,100,200: Exhaust silencer 2: Housing

3: inlet pipe 4: discharge pipe

5,6: bulkhead 7,8: chamber

9,10: flow pipe 120,220: body

122a, 222a: noise inflow hole 122b, 222b: noise inflow hole

140,240: Noise guide 160,160 ', 160 ", 260: Noise attenuation pipe

162,162 ', 162 ", 262: Noise inlet 280: Auxiliary noise attenuation pipe

Claims (8)

As an exhaust silencer for an internal combustion engine: A body having noise inflow holes and noise discharge holes installed on both sides of the exhaust noise from the exhaust port of the internal combustion engine to the outside; And And a noise guide installed at the noise inlet hole side of the body and having a noise rotating part so that the exhaust noise discharged through the exhaust port is rotated and attenuated. The noise inlet of claim 1, wherein the noise inlet is formed on the opposite side of the noise outlet to further attenuate the exhaust noise introduced into the body through the noise guide. An exhaust silencer further comprising a noise attenuation pipe having. 3. The exhaust silencer according to claim 2, wherein the noise attenuation pipe has a plurality of noise inlets on opposite sides of the noise outlet. 4. The exhaust silencer according to claim 3, wherein a guard having an inclined surface is provided on the noise inlet side so that exhaust noise rotating through the noise guide does not directly enter the noise inlet. The exhaust silencer according to any one of claims 2 to 4, wherein a plurality of protrusions are formed on a surface of the noise attenuation pipe. The exhaust silencer according to claim 2, wherein the body further has an auxiliary noise attenuation pipe formed at an outer side of the noise attenuation pipe and on an opposite side of the noise inlet of the noise attenuation pipe. The exhaust silencer according to claim 1, wherein the noise guide has a conical shape, and the noise rotating part is formed of a plurality of spiral grooves on the surface of the conical noise guide. The exhaust silencer according to claim 1, wherein the noise guide has a drum shape, and the noise rotating part is formed of a plurality of wings in the drum-type noise guide.