JP2001271627A - Muffler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a muffler capable of preventing carbon soot from being discharged. SOLUTION: This muffler 1 is provided with a muffler body 2, partitioned into a plurality of expansion chambers S2 to S6, including at least the expansion chamber S2 in the forefront part and the expansion chamber S6 in the rearmost part, an inlet pipe 3 for introducing an exhaust gas discharged from an internal combustion engine to the expansion chamber S2 in the forefront part, a connecting pipe 4 for connecting the mutually adjacent expansion chambers S2 to S6 to each other, and discharge pipes 5a, 5b for discharging exhaust gas in the expansion chamber S6 in the backmost part to the outside of a muffler body 2. The muffler is provided with thin wires 7, 7 and 7 having high heat transfer performance and arranged in the inlet pipe along the exhaust passage.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a muffler capable of reducing exhaust noise of exhaust gas discharged from an internal combustion engine.

[0002]

2. Description of the Related Art A muffler for reducing the exhaust noise of exhaust gas discharged from an engine is mounted on an automobile or a motorcycle. This muffler has a closed box-shaped muffler body divided into a plurality of expansion chambers, an introduction pipe for introducing exhaust gas to the foremost expansion chamber of the expansion chambers, and a rearmost expansion chamber of the expansion chambers. A discharge pipe for discharging exhaust gas to the outside of the muffler body. In this case, each expansion chamber is configured such that adjacent expansion chambers are connected by a connection pipe, and the exhaust gas introduced via the introduction pipe can sequentially pass from the frontmost expansion chamber to the rearmost expansion chamber. Further, the introduction pipe and the discharge pipe are configured using a punching pipe having countless holes formed, and glass wool as a sound absorbing material is wound around the outer circumference thereof. Therefore,
During driving of the vehicle, first, exhaust gas discharged from the engine comes into contact with glass wool through a myriad of holes when passing through the introduction pipe, and the acoustic energy of exhaust sound is attenuated by the frictional force. Further, the exhaust gas introduced into the frontmost expansion chamber via the introduction pipe is sequentially passed through each expansion chamber via the connection pipe, flows into the rearmost expansion chamber, and expands in each expansion chamber. In this case, the exhaust sound resonates in each of the expansion chambers, and the acoustic energy is canceled out to reduce the noise. Thereafter, the exhaust gas is discharged to the outside of the muffler main body through the discharge pipe.

[0003]

However, the conventional muffler has the following problems. In other words, in the conventional muffler, the sound energy of the exhaust sound is attenuated by the contact resistance with the glass wool and the resonance effect in each expansion chamber, thereby reducing the noise. However, the exhaust from the engine is simply
It is discharged outside the muffler through the expansion chamber and the discharge pipe. For this reason, the conventional muffler has a problem that, for example, when the engine speed is rapidly increased, the carbon suit mainly composed of carbon fine particles is discharged from the discharge pipe together with the exhaust gas. In addition, conventional mufflers have aged deterioration of glass wool as a sound absorbing material,
There is also a problem that a large amount of carbon suit adheres to the glass wool, which may cause a reduction in noise reduction performance.

[0004] The present invention has been made in view of such a problem, and has as its main object to provide a muffler capable of preventing discharge of a carbon suit. Another object of the present invention is to provide a muffler capable of maintaining a silent performance for a long period of time.

[0005]

According to a first aspect of the present invention, there is provided a muffler comprising: a muffler body divided into a plurality of expansion chambers including at least a frontmost expansion chamber and a rearmost expansion chamber; A muffler including an inlet pipe for introducing exhaust gas discharged into the frontmost expansion chamber, a connecting pipe for connecting adjacent expansion chambers, and a discharge pipe for discharging exhaust gas in the rearmost expansion chamber to the outside of the muffler body. , Characterized by comprising a highly heat conductive thin wire disposed inside the introduction pipe along the exhaust flow path.

According to a second aspect of the present invention, in the muffler according to the first aspect, a thin wire is continuously arranged from the inside of the introduction pipe to the rearmost expansion chamber along the exhaust flow passage in the muffler body. Features.

A muffler according to a third aspect is characterized in that, in the muffler according to the first or second aspect, the thin wire is constituted by a helical spring.

A muffler according to a fourth aspect is characterized in that, in the muffler according to any one of the first to third aspects, a filter is provided in the foremost expansion chamber.

According to a fifth aspect of the present invention, in the muffler according to the fourth aspect, the muffler main body forms a first case forming a foremost expansion chamber, and other expansion chambers other than the foremost expansion chamber. And a second case in which the first case is detachable.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a muffler according to the present invention will be described below with reference to the accompanying drawings.

First, the structure of the muffler 1 according to the present invention will be described with reference to the drawings.

As shown in FIG. 1, the muffler 1 includes a muffler body 2, an inlet pipe 3, connecting pipes 4, 4,.
5b, a flow straightening tube 6 and helical springs 7, 7, 7 are provided. The muffler main body 2 includes a case 2a corresponding to the first case in the present invention, and a case 2b corresponding to the second case in the present invention and in which the case 2a is configured to be detachable. As shown in FIG. 2, the case 2 a includes a peripheral plate 11 formed in a cylindrical shape, and a back plate 12 that closes one opening of the peripheral plate 11. In this case, the discharge pipe 5b is welded to the back plate 12 while being inserted through the case 2a. Hooks 14, 14 for attaching the muffler 1 to the chassis of the automobile are welded to the back plate 12. Further, as shown in FIG. 3, filters 13, 13,... For filtering fine particles in exhaust gas introduced through the introduction pipe 3 are provided in an internal space S <b> 1 formed by the peripheral plate 11 and the back plate 12. Are arranged. in this case,
The internal space S1 corresponds to the foremost expansion chamber in the present invention.

As shown in FIG. 2, the case 2b includes peripheral plates 15a and 15b which can be divided into upper and lower portions, and peripheral plates 15a and 15b.
A partition plate 16 for closing one opening of the cylindrical body formed by the above, a back plate 17 for closing the other opening, and peripheral plates 15a and 15b arranged between the partition plate 16 and the back plate 17 In addition, partition plates 18 and 1 forming internal spaces S2 to S6
8 ... In this case, the internal space S6 corresponds to the rearmost expansion chamber in the present invention. In addition, the partition plate 1
6, the introduction pipe 3 is welded to the back plate 17 and the partition plates 18, 18,... Further, the connecting pipes 4, 4,... Are welded to the partition plate 16 and the partition plates 18, 18,. In addition, hook 1
4, 14 are welded.

On the other hand, a stay 3a for connection to an exhaust pipe (not shown) is welded to the distal end of the introduction pipe 3. Also, as shown in FIG. 1, the connecting pipes 4, 4,.
The opening on the exhaust gas introduction side has a large diameter, and the opening on the exhaust gas discharge side has a small diameter. Therefore, when the exhaust gas passes through the connecting pipe 4, a slight resistance is generated, and as a result, the exhaust pressure in each expansion chamber is increased, and the attenuation of acoustic energy is promoted. Discharge pipes 5a, 5b
Are configured to be connectable to each other. In this case, a rectifying pipe 6 for facilitating the discharge of exhaust gas from the discharge pipe 5b by air flowing along the outer circumference of the muffler 1 when the vehicle is running is attached to the distal end of the discharge pipe 5b. The helical spring 7 corresponds to a thin wire in the present invention, and is continuously provided from the inlet of the inlet pipe 3 to the internal space S6. In this case, as the helical spring 7, for example, a thin wire of stainless steel having a high heat conductivity and excellent corrosion resistance and a diameter of about 0.8 to 1 mm is used. In this muffler 1, for example, three helical springs 7, 7, 7 are twisted. Therefore, as shown in FIG. 4, for example, inside the introduction tube 3, a portion A in which the helical springs 7, 7, 7 overlap and become dense, and a portion B in which the helical springs 7, 7 are separated from each other and become rough, are generated. Exhaust gas easily comes into contact with the springs 7,7,7.

Next, a method of using the muffler 1 will be described with reference to the drawings.

First, as shown in FIG. 5, the case 2a is attached to the case 2b. In this case, the discharge pipes 5a, 5
b and the opening of the case 2a is
The cases 2a and 2b are fixed to each other by bolts or rivets while being closed by the partition plate 16 of b. Next, when the vehicle is mounted on the vehicle, the introduction pipe 3 is connected to the exhaust pipe of the vehicle via the stay 3a, and the hooks 14, 1 are attached to the rubber bush mounted on the chassis of the vehicle.
4. Lower the muffler 1 by inserting. Thereby, the attachment of the muffler 1 is completed.

During operation, the exhaust gas discharged from the engine passes through the exhaust pipe, flows into the introduction pipe 3, passes through the introduction pipe 3, and is successively introduced into the internal space S1. In this case,
The helical springs 7, 7, 7 are heated by the hot exhaust gas flowing one after another to a temperature much higher than the temperature of the exhaust itself. As a result, the exhaust gas introduced thereafter is brought into contact with the helical springs 7, 7, and heated, so that most of the carbon suit contained in the exhaust gas is completely burned in the introduction pipe 3. In addition, most of the ashes generated by burning of the carbon suit and most of the carbon suit that did not burn in the introduction pipe 3 are the filters 13 in the case 2a.
Filtered. Thereafter, the exhaust gas in the internal space S1 passes through the connecting pipes 4, 4,... And is sequentially pumped to the internal spaces S2 to S6. At this time, a part of the carbon suit that has passed through the filters 13 and 13 sequentially passes through the internal spaces S2 to S6 while being in contact with the helical springs 7, 7, 7 extending to the internal space S6. . In this case, the helical spring 7
Are heated to high temperatures due to their high thermal conductivity. For this reason, the exhaust gas is completely burned by being heated by the helical springs 7, 7, 7.

Further, in the muffler 1, when the exhaust gas expands in each expansion chamber, the exhaust sound resonates in the expansion chamber and the acoustic energy thereof is canceled out in the same manner as the conventional muffler, so that the noise is reduced. . On the other hand, the exhaust gas from which the carbon suit has been removed while the noise has been reduced is discharged to the exhaust pipes 5a, 5a.
b and is discharged outside the muffler 1. At this time, as shown in FIG. 1, in this muffler 1, air flowing along the outer periphery of the muffler 1 due to the running of the automobile flows into the gap between the straightening pipe 6 and the discharge pipe 5b as shown by arrows C and C. Thereby, the discharge of the exhaust gas from the discharge pipe 5b is promoted.

As described above, according to the muffler 1, the carbon suit in the exhaust gas is burned by the helical springs 7, 7, 7 heated by the exhaust gas, and the filter 13,
The carbon suit is removed inside the muffler 1 without being discharged outside by filtering through 13. Also, according to the muffler 1, the filters 13, 1
Since the case 2a provided with 3... Is detachably mounted on the case 2b as a separate body, the filters 13, 13.
When clogging occurs, the case 2a can be removed from the case 2b and a new case 2a can be mounted on the case 2b. For this reason, it is possible to avoid an increase in exhaust resistance due to clogging of the filters 13, 13,... And insufficient filtration of the carbon suit. Further, in the muffler 1, when the exhaust gas comes into contact with the helical springs 7, 7, 7, the acoustic energy of the exhaust sound is attenuated by the frictional force. High noise reduction performance can be maintained without disposing.

The present invention is not limited to the configuration shown in the above embodiment of the present invention. For example, in the embodiment of the present invention, the helical springs 7, 7, made of stainless steel are used.
Although an example in which 7 is disposed in the muffler 1 has been described, the material of the fine wire in the present invention is not limited to this, and for example, a copper wire or a ceramic fine wire can be used.
Also, in the embodiment of the present invention, an example using three helical springs 7 has been described, but the number of helical springs 7 to be used is not limited to this. In this case, for example, if a helical spring whose winding diameter changes sequentially every predetermined number of turns is used, only one helical spring is provided, and the helical springs 7, 7,.
It is possible to obtain substantially the same effect as in the state in which 7 is twisted. Further, in the embodiment of the present invention, an example in which the helical springs 7, 7, 7 are continuously arranged from the inside of the introduction pipe 3 to the internal space S6 has been described, but the present invention is not limited to this, and for example, Alternatively, the helical spring 7 may be provided only in the introduction pipe 3, or the helical spring 7 may be continuously provided from the inside of the introduction pipe 3 to the inside of the discharge pipes 5a and 5b.

In the embodiment of the present invention, the discharge pipes 5a and 5b connectable to each other as the discharge pipe in the present invention.
Although the example of the muffler 1 having the above has been described, the present invention is not limited to this, and the discharge pipes 5a and 5b are integrally configured and fixed to the case 2b side, and the rectifying pipe 6 is configured to be detachable. The discharge pipe may be configured to be inserted into the back plate 12 of the case 2a. Further, in the embodiment of the present invention, an example in which the partition plate 16 is provided on the case 2b side has been described, but the partition plate 16 may be provided on the case 2a side. Further, by covering the cases 2a and 2b with the heat insulating cover, it is possible to prevent a fire that may occur due to the heating of the muffler main body 2.

[0022]

As described above, according to the muffler of the first aspect, the high heat conductive thin wire is disposed inside the introduction pipe along the exhaust flow path, so that the thin wire heated to a high temperature can be used. As a result of burning the carbon suit in the exhaust, the carbon suit can be removed inside the muffler without being discharged to the outside.

According to the muffler of the second aspect,
By continuously arranging the fine wires from the introduction pipe to the rearmost expansion chamber along the exhaust flow passage in the muffler body, it is possible to increase the contact area between the fine wires and the exhaust,
The carbon suit can be reliably removed.

Further, according to the muffler according to the third aspect, the use of the helical spring as the thin wire makes it possible to make contact with the exhaust as compared with a case where a linear thin wire is arranged along the exhaust flow path. Since the area can be increased, the fine wire can be heated to a higher temperature by the exhaust heat, and the carbon suit in the exhaust can be more completely and completely burned.

According to the muffler of the fourth aspect,
By disposing a filter in the foremost expansion chamber, carbon suits that did not completely burn in the introduction pipe and the ash of the carbon suit that was not completely burned were filtered by the filter.
The exhaust gas can be further purified.

Further, according to the muffler of the fifth aspect, the muffler includes the first case forming the foremost expansion chamber and the second case forming the other expansion chamber excluding the foremost expansion chamber. By configuring the main body, the first case can be easily replaced when the filter disposed in the foremost expansion chamber is clogged, whereby the life of the muffler can be extended.

[Brief description of the drawings]

FIG. 1 is a sectional view of a muffler 1 according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view of the muffler 1 according to the embodiment of the present invention.

FIG. 3 is an external perspective view of a case 2a of the muffler 1.

FIG. 4 is a side view of the helical springs 7, 7, 7 in the introduction pipe 3 of the muffler 1.

FIG. 5 is an external perspective view of the muffler 1 according to the embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Muffler 2 Muffler main body 2a Case 2b Case 3 Inlet pipe 4 Connecting pipe 5a, 5b Discharge pipe 7 Vine spring 13 Filter S1 to S6 Internal space

Claims (5)

[Claims] A muffler body partitioned into a plurality of expansion chambers including at least a frontmost expansion chamber and a rearmost expansion chamber;
An introduction pipe for introducing exhaust gas discharged from the internal combustion engine into the frontmost expansion chamber, a connecting pipe connecting the adjacent expansion chambers, and discharging the exhaust gas in the rearmost expansion chamber to the outside of the muffler body. A muffler comprising a discharge pipe and a highly heat conductive thin wire disposed inside the introduction pipe along an exhaust flow path. 2. The muffler according to claim 1, wherein the thin wires are continuously arranged along the exhaust flow path in the muffler main body from the inside of the introduction pipe to the rearmost expansion chamber. 3. The muffler according to claim 1, wherein the thin wire is formed of a helical spring. 4. The muffler according to claim 1, wherein a filter is provided in the foremost expansion chamber. 5. The muffler body includes a first case forming the foremost expansion chamber, and another expansion chamber excluding the foremost expansion chamber, and the first case is configured to be detachable. The muffler according to claim 4, further comprising a second case.