JPS59113231A - Silencer - Google Patents

Abstract

PURPOSE:To enhance the silencing effect of a silencer and to facilitate assembling operation of the same, by forming a tail passage between the peripheral wall and partition plates disposed in the body of the siliencer in the manner that it is extended circumferentially of the siliencer body, and forming an exhaust-gas outlet port defined by one end part of the partition plate and an exhaust-gas discharging plate and extended tangentially of the tail passage. CONSTITUTION:In the body 1 of a silencer, an upper partition plate 2, an intermediate partition plate 3 and a lower partition plate 4 are welded to the inner surface of a peripheral wall 1a, so that the inner space of the silencer body 1 is divided into an upper chamber 5, an intermediate chamber 6 and a lower chamber 7. In the lower chamber 7, a tail passage 11 defined by the peripheral wall 1a, a cylindrical part 10a of the partition plate and the intermediate and lower partition plates 3, 4 is formed. On the other hand, a connecting part 12a at one end of an exhaust-gas discharging plate 12 extended tangentially of the tail passage 11 is welded to the outer surface of the wall 1a of the silencer body 1. Further, a communicating opening 10d is formed in said cylindrical part 10a near an exhaust port 1b on the opposite sides of one end part 10b of a parttion plate 10 so that the tail passage 11 is communicated with the lower chamber 7 located on the inside of the partition plate 10 via the communicating opening 10d.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a muffler for exhaust gas of an internal combustion engine.

In such a silencer, if the tail pipe is lengthened,
Compared to the case where the tail pipe is short, the noise reduction effect is better when the structure other than the tail pipe is the same, such as the muffler body and the built-in muffling element. However, in conventional silencers, such as the one described in Utility Model Publication No. 7169/1980, the tail pipe simply protrudes from the silencer body, so if the tail pipe is lengthened, the silencer can be installed more easily. In particular, in those used in general-purpose engines, where the tail pipe protrudes outward from the outer periphery of the muffler body, a long tail pipe makes it impossible to install the muffler. Therefore, in order to solve this problem, the applicant of the present invention formed a long pipe whose end is open to the atmosphere along the peripheral wall surface of the muffler body so as to wrap around the body, and A pipe in which a part of the pipe wall was made up of the wall of the body was first proposed in 1983.
It was proposed as No. 121146, and it has a better noise reduction effect than conventional models with short tail pipes, requires at least the same amount of space as conventional models with short tail pipes, and can be installed in general-purpose engines without any problems.

The present invention further improves what was previously proposed by the above-mentioned applicant, allows smooth flow of exhaust gas in the tail pipe section, prevents the generation of air flow noise at the exhaust outlet section, and further improves the ease of assembly. The purpose of this invention is to provide a silencer that is easy to use.

In order to achieve this object, the muffler of the present invention includes a partition plate disposed within the muffler body, and a tail conduit connected to the muffler body between the partition plate and the peripheral wall of the muffler body. one end of the partition plate is fixed to the peripheral wall of the silencer body by extending in the tangential direction of the inner circumference of the tail pipe,
and an exhaust outlet plate extending in a tangential direction to the outer circumference of the tail pipe is fixed to the peripheral wall of the muffler body, and an exhaust hole portion is formed in the peripheral wall of the muffler body between one end of the partition plate and the exhaust outlet plate. The exhaust outlet section is formed to extend in the tangential direction of the tail pipe, and the end of the exhaust outlet section is opened to the atmosphere.

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

In FIGS. 1 to 4, reference numeral @1 denotes a muffler body, and the muffler body 1 is formed into a substantially cylindrical shape with a vertical shaft whose upper and lower ends are sealed. Inside the muffler body 1 is a top welded to the peripheral wall 1a of the muffler body 1.

Middle and lower partition plates 2, 3.4 are provided, and these divide the interior of the silencer body 1 into upper, middle, and royal chambers 5, 6.7, which are divided into an upper chamber 5 and a middle chamber 6. The middle chamber 6 and the lower chamber 7 each have a communication pipe 8.9.
It is communicated with. A partition plate 10 is arranged in the lower chamber 7, and this partition plate 10 is arranged in the upper chamber.

The lower ends are welded to the middle and lower partition plates 3.4, respectively,
The cylindrical portion 10a is arranged concentrically with the peripheral wall 1a of the muffler body 1. Further, a tail conduit 11 is formed surrounded by the peripheral wall 1a of the muffler body 1, the cylindrical portion 10a of the partition plate 10, and the middle and lower partition plates 3.4. Partition plate 100
One end portion 10b extends from the cylindrical portion 10a in a tangential direction to the inner circumference of the tail conduit 11, and is bent by contacting the inner surface of the peripheral wall 1a of the muffler body 1, and this bent portion 10c is welded to the surface 11a. One end of the partition plate 10 opposite to the bent portion 10c is welded to the end 10b. Said tail pipe line 1
A mounting portion 12a at one end of the exhaust outlet plate 12 extending in the tangential direction of the outer circumference of the silencer body 1 is welded to the outer circumference of the circumferential wall 1a of the silencer body 1. As shown in FIG. 5, the exhaust outlet plate 12 includes upper and lower plates 12c and 1 on a side plate 12b continuous to the mounting plate 12a.
upper and lower plates 12c, each having a triangular shape in plane,
12d is also welded to the outer surface of the peripheral wall 1a of the silencer body 1. One end portion 10b1 of the partition plate 10, exhaust outlet plate 12
An exhaust outlet section 13 is formed, which is surrounded by a part of the middle and lower partition plates 3 and 4 and has a built-in exhaust hole 1b formed in the peripheral wall 1a of the muffler body 1. It extends in the tangential direction of the tail pipe 11 with the same shape and size, and its end is opened to the atmosphere.

A communication port 10d is formed in the cylindrical portion 10a at a portion near the exhaust hole 1b, sandwiching one end 10b of the partition plate 10, and the tail pipe 11 is connected to the lower chamber 7 on the inner peripheral side of the partition plate 10 by the communication port 10d. It is communicated. In FIG. 1, reference numeral 14 is an inlet pipe fixed to the peripheral wall 1a of the muffler body 1 and communicating with the upper chamber 5.

In the muffler according to one embodiment of the present invention configured as described above, exhaust gas is guided from the inlet pipe 14 connected to the exhaust port of the internal combustion engine main body to the upper chamber 5 in the muffler body 1 and expanded.
The upper chamber 5 passes through the communicating pipe 8 to the middle chamber 6, and from the middle chamber 6 passes through the communicating pipe 8 to the lower chamber 7, where they expand, and then from the lower chamber 7 to the communicating port 10.
The exhaust gas is discharged to the atmosphere through the tail pipe 11 and the exhaust outlet 13, during which time the exhaust noise is muffled.

In addition, since the tail pipe 11 is formed along the circumferential direction of the silencer body 1 with a length close to the entire circumference thereof, the noise reduction effect is better than that of conventional silencers with a short tail pipe length. Furthermore, since the exhaust outlet plate 12 protrudes from the outer periphery of the silencer body by at least the same length as a conventional silencer with a short tail pipe length, even if it is used in a general-purpose engine, it will not cause problems in terms of equipment or space. There's nothing wrong with that.

Further, since the exhaust outlet portion 13 extends in the tangential direction of the tail pipe 11, the end portion of the tail pipe 11 is partitioned in the radial direction by the partition 15 as shown in FIG. The one in which an exhaust hole 1b is simply formed in 1a is
Unlike the turbulence that occurs in the exhaust gas flow due to collision with the partition 15, the exhaust gas flow passes through the exhaust outlet portion 13 and is released into the atmosphere as a smooth flow, thereby preventing generation of air flow noise. Moreover, since the communication port 10d is disposed near one extended end of the partition plate 10, it can also be used as a passage for the lFi pole when spot welding the partition plate 10 to the silencer body 1. With, compared to connecting a short tube to the tail conduit,
Since the exhaust outlet plate 12 only needs to be welded to the outer surface of the peripheral wall 1a of the muffler body 1, assembly is easy.

In addition, in the present invention, the sound deadening element built into the silencer body is not limited to those of the embodiments described above, and any suitable sound deadening element may be used, and the lower partition plate 10 may be omitted.
The bottom wall of the muffler body may form the tail pipe and the lower wall of the exhaust outlet.

As explained above, in the muffler of the present invention, the tail pipe is formed along the circumferential direction of the muffler body between the partition plate disposed inside the muffler body and the peripheral wall of the muffler body.
The noise reduction effect is better than the conventional one with a short tail pipe,
and can be installed in at least the same space as one with a short tail pipe, one end of the partition plate is extended and fixed to the peripheral wall of the muffler body, and the exhaust outlet plate is fixed to the peripheral wall of the muffler body. Since the exhaust outlet part extending in the tangential direction of the tail pipe is formed between one end of the partition plate and the exhaust outlet plate, the exhaust gas flows smoothly from the tail pipe through the exhaust outlet part and is released into the atmosphere. As a result, it is possible to prevent the generation of airflow noise at the first air outlet, and furthermore, it is possible to obtain the effects that assembly is easy.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view showing one embodiment of the present invention, Fig. 2 is a sectional view taken along the line FIG. 5 is a developed view of the exhaust outlet plate, and FIG. 6 is a cross-sectional view of a muffler as a reference example. 1... Silencer body, 1a... Peripheral wall, 1b... Exhaust hole, 2°3.4... Upper, middle, lower stage partition plate, 5, 6.
7...Top. Middle, Royal, 8.9...Communication pipe, 10...Partition plate, 1
0a...Cylindrical part, 10b...One end part, 10c...
Bent portion, 10d...Communication port, 11...Tail conduit,
12...Exhaust outlet plate, 12a...Mounting plate, 12b.
...Side plates, 12c, 12d...Top and bottom plates, 13.
...Exhaust outlet section, 14...Inlet pipe, 15...Partition. Figure 1 4? Figure 2, Figure 3, Figure 4, Figure 5, Figure 6.188-

Claims (1)

[Claims] A partition plate is disposed within the silencer body, a tail conduit is formed along the circumferential direction of the body of the silencer between the partition plate and the peripheral wall of the silencer body, and one end of the partition plate is fixed to the circumferential wall of the muffler body by extending in the tangential direction of the inner circumference of the tail conduit, and an exhaust outlet plate extending in the tangential direction of the outer circumference of the tail conduit is fixed to the circumferential wall of the muffler body. An exhaust outlet including an exhaust hole formed in the peripheral wall of the muffler body is formed between the one end and the exhaust outlet plate so as to extend in the tangential direction of the tail pipe, and the end of the exhaust outlet is opened to the atmosphere. A silencer characterized by: