JP2005233011A - Muffler - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a muffler capable of miniaturizing the muffler, and capable of reducing cost, while enhancing the muffling effect, by lengthily forming an exhaust gas flow passage such as the length of a tail pipe, without restricting a layout in the muffler, in a limited narrow space in the muffler. <P>SOLUTION: An inflow port 41 and an outflow port 51 of exhaust gas are arranged in a respectively opposed state in an outer peripheral part position mutually separate in the width direction of a muffler body 1 in mutually opposed upstream side partition chamber plate 4 and downstream side partition chamber plate 5 among partition chamber plates for partitioning the inside of the muffler body 1 into a plurality of chambers 1a, 1b and 1c in the exhaust gas flowing direction. The exhaust gas flow passage up to the outflow port 51 from the inflow port 41 is formed long in a zigzag shape by respectively arranged two sheets of upstream side partition plates 6 and downstream side partition plates 7 alternately projecting in the opposed partition chamber plate directions on an opposed surface of both partition chamber plates 4 and 5. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a silencer provided in an exhaust system of an internal combustion engine, and more particularly to an improved technique in terms of noise reduction performance.

Conventionally, in a silencer provided in an exhaust system of an internal combustion engine, in order to effectively reduce noise in the low frequency range (humming noise), the length of the tail pipe that exhausts exhaust gas from the silencer to the atmosphere is reduced. It is known that taking enough is effective.
However, since the lower part of the vehicle body is subject to various restrictions, the degree of freedom in setting the position of the silencer is small, and therefore there is a limit to making the tail pipe sufficiently long.

  Therefore, as a solution to the above problems, the outlet pipe 103 connected to the tail pipe 102 is U-shaped (see, for example, Patent Document 1) in the silencer 101, or as shown in FIG. There is one in which the total length of the tail pipe is extended by bending it into an S shape (see, for example, Patent Document 2) and increasing the flow path length.

Japanese Utility Model Publication No. 55-59119 (Specification (page 5), FIG. 4) JP 2002-21528 A (page (3) of the specification, FIG. 1)

However, when the outlet pipe 103 is bent and arranged in a U-shape or S-shape in the silencer 101 as in the conventional example, there are problems as listed below.
That is, as shown in FIG. 6, the silencer 101 is generally divided into a plurality of expansion chambers 105a, 105b, and 105c by inner plates (baffles) 104a and 104b having small-diameter communication holes. The exhaust gas is repeatedly expanded at 105b and 105c to reduce the pressure and temperature of the exhaust gas, thereby silencing, but the length of the outlet pipe 103 that extends the tail pipe 102 is sufficiently long. In order to secure the outlet pipe 103, it is necessary to arrange the outlet pipe 103 bent in a U-shape or S-shape over almost the entire length of the silencer chamber. The expansion area in 105b and 105c is reduced, and thus the expansion ratio is reduced, so that the low frequency region is reduced. Resulting in reducing the attenuating effect in the.

  Also, when bending the pipe member, the smaller the bending radius, the less likely the roundness of the bent portion will be, so there is a limit to reducing the bending radius of the bent portions 103a, 103b. As a result, the muffler 101 protrudes greatly in the width direction, so the layout in the muffler 101 is limited.

  Further, it is necessary to make holes for inserting and supporting the outlet pipe 103 bent in all the inner plates 104a and 104b, and the assembling work thereof becomes complicated, resulting in high costs. It will be.

  The problem to be solved by the present invention is to form a long exhaust gas passage such as the length of the tail pipe without limiting the layout in the silencer in a limited narrow space in the silencer. It is possible to reduce the cost of the silencer while enhancing the silencing effect, and to provide a silencer capable of reducing the cost. Further, the exhaust gas can be expanded in the long exhaust gas passage. It is an additional subject to be able to exhibit the silencing effect due to the above and to obtain the effect of reducing the pressure loss.

  In order to solve the above-mentioned problem, a silencer according to claim 1 is provided with an exhaust gas inlet port between both opposing compartment plates out of compartment plates that divide the silencer body into a plurality of chambers along the exhaust gas flow direction. And outlets facing each other at the outer peripheral positions separated from each other in the width direction of the silencer body, and partition plates projecting alternately toward the facing chamber plate direction on the opposing surfaces of the two chamber plates By arranging a plurality of the exhaust gas passages, the exhaust gas flow path from the inflow port to the outflow port is formed long in a zigzag shape.

  The silencer according to claim 2, wherein the partition plates arranged in the two compartment plates are arranged in an inclined manner toward the partition plate in which the tip side is arranged downstream of the exhaust gas flow path. 2. The silencer according to claim 1, wherein an exhaust gas expansion chamber is formed between the partition plates of the two compartment plates.

  The silencer according to claim 3 is the silencer according to claim 1 or 2, characterized in that the compartment plate in which the outlet is formed is composed of a downstream outer plate constituting the silencer body. It was a means to do.

  A silencer according to a fourth aspect of the present invention is the silencer according to any one of the first to third aspects, wherein the outlet is connected to a tail pipe.

  The silencer according to claim 5 is the silencer according to any one of claims 1 to 4, wherein the chamber plate in which the inlet is formed is configured by an upstream outer plate that constitutes the silencer body. It was set as the characteristic feature.

  A silencer according to a sixth aspect is the silencer according to any one of the first to fifth aspects, wherein the inlet is communicated with an inlet pipe.

  The silencer according to claim 7 is the silencer according to any one of claims 1 to 6, wherein a small hole is formed in the partition plate.

In the silencer according to claim 1, as described above, from the inlet to the outlet by arranging a plurality of partition plates alternately projecting toward the opposing compartment plate direction on the opposing surfaces of the compartment plates. Exhaust gas such as the length of the tailpipe without restricting the layout in the silencer in a limited narrow space in the silencer. Therefore, the silencer can be reduced in size while enhancing the silencing effect, and the cost can be reduced because the long passage is formed only by the plate material. The effect is obtained.
Moreover, since it can adapt according to a vehicle model according to the number of partition plates, it becomes possible to reduce the cost by sharing parts.

  In the silencer according to claim 2, as described above, the partition plates arranged in the two compartment plates are arranged in an inclined manner toward the partition plate in which the tip side is arranged downstream of the exhaust gas flow path. By doing so, an expansion chamber for exhaust gas can be formed between the partition plates of both compartment plates, so that a silencing effect due to expansion can be obtained, thereby further enhancing the silencing effect. At the same time, the bending angle of each folded portion of the exhaust gas flow becomes gentle, so that the effect of reducing the pressure loss can be obtained.

  In the silencer according to claim 3, as described above, the compartment plate on which the outlet is formed is composed of the downstream outer plate constituting the silencer body, thereby omitting the downstream compartment plate. The long exhaust gas passage can be made to function as a passage extending the tail pipe.

  In the silencer according to claim 4, as described above, the long exhaust gas flow path can be made to function as a flow path extending the tail pipe by adopting a configuration in which the outlet is connected to the tail pipe. It becomes like this.

  In the silencer according to the fifth aspect, since the compartment plate in which the inlet is formed is configured by the upstream outer plate constituting the silencer body, the upstream compartment plate can be omitted.

  In the silencer according to a sixth aspect of the present invention, the long exhaust gas flow path can be made to function as a flow path extending from the inlet pipe by adopting a configuration in which the inlet is communicated with the inlet pipe.

  In the silencer according to the seventh aspect, gas interference for silencing can be easily generated by forming a small hole in the partition plate.

  Embodiments of the present invention will be described below with reference to the drawings.

The silencer of the first embodiment corresponds to the invention described in claims 1, 2, 4, 6, and 7.
First, the silencer of the first embodiment will be described with reference to the drawings.

1 is a transverse plan view showing the silencer of the first embodiment, FIG. 2 is a longitudinal sectional view taken along line II-II in FIG. 1, and FIG. 3 is a longitudinal sectional view taken along line III-III in FIG.
This silencer mainly includes a silencer body 1, an inlet pipe 2, an outlet pipe 3, an upstream side compartment plate 4, a downstream side compartment plate 5, an upstream side partition plate 6, and a downstream side partition plate 7. It is prepared as a simple configuration.

  More specifically, the silencer body 1 includes a substantially cylindrical outer shell 11, an upstream outer plate 12 that closes the upstream opening of the outer shell 11, and a downstream opening of the outer shell 11. And the downstream outer plate 13.

  The outlet pipe 3 is connected to a tail pipe (not shown).

  The silencer body 1 is partitioned into three chambers 1a, 1b, and 1c by the upstream side compartment plate 4 and the downstream side compartment plate 5. The upstream side compartment plate 4 and the downstream side compartment plate 5 are provided with exhaust gas inlets 41 and outlets 51 in opposition to outer peripheral positions separated from each other in the lateral width direction of the silencer body 1.

  Further, the upstream partition plate 6 and the downstream partition plate 7 are in a state where the upstream partition plate 6 and the downstream partition plate 7 protrude alternately toward the facing compartment plate direction on the facing surfaces of the upstream compartment plate 4 and the downstream compartment plate 5, respectively. By arranging so as to protrude one by one, the exhaust gas flow path from the inlet 41 to the outlet 51 in the central chamber 1b is formed long and zigzag.

And in this Example 1, by arrange | positioning the said upstream partition plate 6 and the downstream partition plate 7 in the state which inclined the front end side toward the partition plate arrange | positioned in the downstream of an exhaust gas flow path. The exhaust gas expansion chambers a are formed between the upstream partition plate 6 and the downstream partition plate 7 and between the upstream partition plate 6 or the downstream partition plate 7 and the outer shell 11. ing.
Further, in the first embodiment, small holes 61 and 71 are formed in the upstream partition plate 6 and the downstream partition plate 7.

Next, operations and effects of the first embodiment will be described.
Since the first embodiment is configured as described above, when the exhaust gas flows from the inlet pipe 2 into the upstream chamber 1a, a silencing effect due to expansion is obtained, and in addition, from the inlet 41 to the central chamber 1b. The noise reduction effect due to the expansion can be exerted when the gas flows in and between the upstream partition plates 6 and the downstream partition plates 7 and the downstream partition plates.

  As described above, in the silencer of the first embodiment, the upstream side compartment plate 4, the downstream side compartment plate 5, and the compartment plate direction opposite to the opposing surfaces of the two compartment plates 4 and 5 are alternately directed. By arranging two protruding upstream partition plates 6 and two downstream partition plates 7 so that the exhaust gas flow path from the inlet 41 to the outlet 51 is formed in a zigzag shape, The exhaust gas passage such as the length of the tail pipe can be formed long without restricting the layout in the silencer body 1 in a limited narrow space in the body 1. As a result, it is possible to reduce the size of the silencer while enhancing the silencing effect.

Moreover, since a long flow path is formed only with a board | plate material, the effect that cost reduction is attained is acquired.
Further, since the number of partition plates 6 and 7 can be adapted according to the vehicle type, the cost can be reduced by sharing parts.

  Further, the upstream partition plates 6 and the downstream partition plates 7 arranged in the upstream compartment plate 4 and the downstream compartment plate 5 are directed in the direction of the partition plate whose leading end side is arranged downstream of the exhaust gas flow path. The exhaust gas expansion chamber a is disposed between the partition plates 6 and 7 of the compartment plates 4 and 5 and between the upstream partition plate 6 or the downstream partition plate 7 and the outer shell 11. Therefore, it is possible to obtain a silencing effect due to expansion, thereby further enhancing the silencing effect, and at the same time, the bending angle of each folded portion of the exhaust gas flow is gradual. Therefore, the effect of reducing the pressure loss can be obtained.

  Further, since the small holes 61 and 71 are formed in the partition plates 6 and 7, gas interference for noise reduction can be easily generated.

  Next, another embodiment will be described. In the description of the other embodiments, the same components as those of the first embodiment are not shown, or the same reference numerals are given and the description thereof is omitted, and only the differences are described.

The silencer of the second embodiment corresponds to the inventions described in claims 1 to 4, 6, and 7.
That is, the second embodiment shows a modification of the silencer in the first embodiment. As shown in the cross-sectional plan view of FIG. 4, the downstream side compartment plate 5 in which the outlet 51 is formed is silenced. This is different from the first embodiment in that it is composed of the downstream outer plate 13 constituting the main body 1 and the outlet 51 is connected to the tail pipe (not shown) via the outlet pipe 3. is there.

  Therefore, in the second embodiment, the same effect as in the first embodiment can be obtained, and the downstream side chamber plate 5 can be omitted, so that the number of parts can be reduced and the silencer can be downsized. At the same time, the long exhaust gas flow path can be made to function as a flow path that extends the tail pipe, so that an additional effect that the silencing effect in the low frequency region can be enhanced is obtained.

The silencer of the third embodiment corresponds to the invention described in claims 1, 2, 4 to 7.
That is, the third embodiment shows a modification of the silencer in the first embodiment. As shown in the cross-sectional plan view of FIG. 5, the upstream side compartment plate 4 in which the inlet 41 is formed is silenced. It differs from the said Example 1 by the point comprised by the upstream outer plate 12 which comprises the container main body 1, and the inflow port 41 being connected to the inlet pipe 2. As shown in FIG.

  Accordingly, in the third embodiment, the same effect as in the first embodiment can be obtained, and the upstream side compartment plate 4 can be omitted, so that the number of parts can be reduced and the silencer can be downsized. At the same time, the long exhaust gas flow path can be made to function as a flow path that extends the inlet pipe 2, so that an additional effect that the noise in the middle frequency range can be shifted to the low frequency range. Can be obtained.

Although the present embodiment has been described above, the present invention is not limited to the above-described embodiment, and design changes and the like within a scope not departing from the gist of the present invention are included in the present invention.
For example, in the embodiment, the partition plates 6 and 7 are provided in an inclined shape, but may be provided in parallel to each other.

In the embodiment, the small holes 61 and 71 are provided in the partition plates 6 and 7, but the size, the number, or the position of the holes are arbitrary, and may not be provided.
Moreover, in the Example, although each partition plate 6 and 7 was arranged side by side in the horizontal width direction of the silencer main body 1, the arrangement direction is also arbitrary.

It is a cross-sectional top view which shows the silencer of Example 1. FIG. It is a longitudinal cross-sectional view in the II-II line of FIG. It is a longitudinal cross-sectional view in the III-III line of FIG. It is a cross-sectional top view which shows the silencer of Example 2. It is a cross-sectional top view which shows the silencer of Example 3. It is a schematic diagram which shows the silencer of a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Silencer main body 11 Outer shell 12 Upstream outer plate 13 Downstream outer plate 2 Inlet pipe 3 Outlet pipe 4 Upstream compartment plate 41 Inlet 5 Downstream compartment plate 51 Outlet 6 Upstream partition plate 61 Small hole 7 Downstream side Partition plate 71 Small hole a Expansion chamber

Claims (7)

Of the compartment plates that divide the interior of the silencer main body into a plurality of chambers along the exhaust gas flow direction, the exhaust gas inlet and outlet are separated from each other in the width direction of the silencer main body on both compartment plates facing each other. It is provided in a state facing each outer peripheral part position,
By arranging a plurality of partition plates alternately projecting toward the facing compartment plate on the opposing surfaces of both compartment plates, the exhaust gas flow path from the inlet to the outlet is formed in a zigzag shape. A silencer characterized by   By arranging the partition plates arranged on the two compartment plates in an inclined manner toward the partition plate, the tip side of which is arranged on the downstream side of the exhaust gas flow path, between the partition plates of the two compartment plates. The silencer according to claim 1, wherein an exhaust gas expansion chamber is formed.   The silencer according to claim 1 or 2, wherein the compartment plate in which the outflow port is formed is constituted by a downstream outer plate constituting a silencer body.   The silencer according to any one of claims 1 to 3, wherein the outlet is connected to a tail pipe.   The silencer according to any one of claims 1 to 4, wherein the compartment plate in which the inflow port is formed is constituted by an upstream outer plate constituting a silencer main body.   The silencer according to any one of claims 1 to 5, wherein the inlet is in communication with an inlet pipe.   The silencer according to any one of claims 1 to 6, wherein a small hole is formed in the partition plate.

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