JP2000320319A - Muffler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily handle a connection pipe so as to connect a duct to a displacement part, wherever a connection pipe duct side opening part arranged in a silencing optimum position is positioned by connecting the connection pipe to the duct in the silencing optimum position and forming the duct and displacement part separately. SOLUTION: A muffler 20 is constructed of a vehicle duct 10, a displacement part 30 formed separately from the duct 10, and a connection pipe 40 connecting the duct 10 to the displacement part 30. The connection pipe 40, formed separately from the duct 10 and the displacement part 30, is installed to the duct 10 through a first connection part 41 in one end and installed to the displacement part 30 through a second connection part 42 in the other end and is opened. The connection pipe 40 may be bent or curved in the middle, so that it can be handled with the displacement part 30 positioned in a mountable part for easily connecting the duct 10 and the displacement part 30 together, wherever an installation optimum position 41a from the silencing view point in the first connection part 41 may be positioned, for example, when the installation optimum position 41a is not positioned in the connection part between the duct 10 and the displacement part 30.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a silencer connected to a duct of a vehicle for silencing.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 8, in a vehicle silencer 2 in which an intake duct 1 and a volume portion 3 are connected (integrally formed) over a length of the volume portion in a volume type silencer, as shown in FIG. A connecting pipe that communicates with the volume 3 is provided within a range of the connection between the intake duct 1 and the volume 3.

[0003]

The above-mentioned silencer has the following problems. The position of the opening of the connecting pipe 4 to the duct 1 is
When considering the entire vehicle intake system, the muffler 2 is not always located at a position that maximizes the muffling effect. In the vehicle, the position of the muffler 2 is almost determined by where the space for securing the space 3 is located near the intake path. Therefore, even if a large space for installing the volume portion 3 is ensured, the noise reduction effect is reduced unless the position of the connection pipe 4 determined by the position is a position where the noise reduction effect of the muffler 2 can be exhibited. SUMMARY OF THE INVENTION An object of the present invention is to provide a muffler that can secure a space for installing a volume portion and can make the muffler exhibit a maximum muffling effect.

[0004]

The present invention to achieve the above object is as follows. (1) A silencer including a duct of a vehicle, a volume part, and a connecting pipe connecting the duct and the volume part, wherein the connecting pipe is connected to the duct at an optimal sound deadening position. A muffler, wherein the duct and the volume are formed separately. (2) A silencer including a duct of a vehicle, a volume part, and a connecting pipe connecting the duct and the volume part, wherein the connecting pipe is connected to the duct at an optimal sound deadening position. A silencer in which the optimal position of the silencer is a position other than a position that is a connecting portion or a shortest path between the duct and the volume portion. (3) A muffler including a vehicle duct, a volume, and a plurality of connecting pipes connecting the duct and the volume, wherein at least one of the plurality of connecting pipes is a duct. And a silencer optimal position, wherein the silence optimal position is at a position other than a position where the duct is connected to the volume or a shortest path. (4) The muffler according to (1), wherein the connecting pipe passes through a space in which other members other than the muffler are installed.

[0005] In the silencer of the above (1), since the connecting pipe connecting the duct and the volume is formed separately from the duct and the volume, the duct-side opening of the connecting pipe arranged at the optimum position for noise reduction is provided. Regardless of the position of the part, the connecting pipe can be easily routed to connect the duct and the volume part. In the silencer of the above (2), since the opening position of the connecting pipe to the duct is provided at a position other than the connecting portion between the duct and the volume or the position that is the shortest path, the opening position of the connecting pipe to the duct can be easily set. It is possible to select the optimum position on the noise reduction. In the muffler according to the above (3), at least one of the plurality of connecting pipes is provided at a position other than the connecting portion between the duct and the volume portion or at a position other than the position that is the shortest path. The opening position can be easily selected to be the optimum position for noise reduction. In the silencer according to the above (4), even when the space in which the volume can be secured is located away from the duct, the duct and the volume can be connected by the connecting pipe formed separately from the duct and the volume.

[0006]

1 to 3 show a silencer according to a first embodiment of the present invention. FIGS. 4 and 5 show a silencer according to a second embodiment of the present invention. Shows a muffler according to a third embodiment of the present invention, and FIG. 7 shows a muffler according to a fourth embodiment of the present invention. Portions common to the first to fourth embodiments of the present invention are denoted by the same reference numerals throughout the first to fourth embodiments of the present invention.

Hereinafter, an embodiment of a muffler according to the present invention will be described by taking as an example a case of a box-type resonator that silences intake noise and branches off from an intake duct (hereinafter simply referred to as a duct) of a vehicle and communicates with the duct. First, the configuration and operation of a portion common to the first to fourth embodiments of the present invention will be described with reference to, for example, FIGS. The silencer 2 of the present invention
0 is the vehicle duct 10, the volume 30, and the volume 30
And a connecting pipe 40 that communicates with the duct 10.

The duct 10 is an intake duct of a vehicle.
The duct 10 is made of, for example, a resin, and is formed by, for example, resin injection molding (injection molding) using a mold (not shown). The volume 30 is made of, for example, resin. The volume 30 is formed integrally with or separately from the duct 10. The volume section 30 is arranged inside the engine room. In the engine room, silencer 20 and silencer 2
Since many components other than zero are arranged, the installation location of the volume unit 30 is limited. The volume 30 communicates with the duct 10 at at least one location through the connection pipe 40. Volume 3
0 may have a plurality of chambers formed by partitioning the inside.

The connecting pipe 40 is made of, for example, a resin, is attached to the duct 10 at a first connecting portion 41 at one end, and is open, and has a volume portion 3 at a second connecting portion 42 at the other end.
0 and open. Optimum installation position of the first connecting portion 41 on sound reduction (hereinafter referred to as optimum sound reduction position) 41
“a” is determined by the frequency at which it is desired to mute the intake sound of the duct 10. When the number of the connection pipes 40 is one, the first connection part 41 is located at the optimum sound deadening position 41a. When there are a plurality of connection pipes 40, at least one of the first connection portions 41
Is located at the optimal sound-absorbing position 41a.

As shown in FIGS. 1 and 4, when there is one connecting pipe 40 that connects the duct 10 and the volume 30 or when there are a plurality of connecting pipes 40, at least one of the connecting pipes 40 , The duct 10 and the volume 30 are formed separately (separate pieces). 1 connecting pipe 40
In the case where there are two or more connecting pipes 40, at least one of them, the first connecting part 41 of the connecting pipe 40 is connected to the connecting part (the duct 1
When the 0 and the volume 30 are integrally formed, they are provided at positions other than the position where the duct 10 and the volume 30 are located at the shortest path. When there are a plurality of connecting pipes 40, the connecting part of the connecting pipe 40 other than the at least one connecting pipe to the duct 10 is provided at a position where the connecting part of the duct 10 and the volume part 30 is the shortest path. You may.

When the connecting pipe 40 is provided at a position other than the connecting portion between the duct 10 and the volume section 30 or at a position which is the shortest path, the connecting pipe 40 may be bent or curved at an intermediate position. The first connecting portion 41 may not be orthogonal to the duct 10, and the second connecting portion 42 may not be orthogonal to the volume 30. Further, the connecting pipe 40 may have a bellows or the like so that the shape can be freely changed.

Next, the operation of the parts common to all the embodiments of the present invention will be described. Since the connection pipe 40 is formed separately from the duct 10 and the volume section 30 and may be bent or curved at an intermediate position, for example, wherever the optimal noise reduction position 41a of the first connection section 41 is, Even when there is no connection between the duct 10 and the volume 30, the duct 10 and the volume 30 can be easily communicated by routing the connecting pipe 40 while keeping the volume 30 at a place where it can be installed. When a plurality of connection pipes 40 are attached to the volume 30, at least one of the plurality of connection pipes 40 is provided.
One is formed separately from the duct 10 and the volume part 30 and may be bent or curved at an intermediate position. Therefore, no matter where the optimal sound-absorbing position 41a is, the connection pipe 40 is circulated and the volume is easily increased. The part 30 and the duct 10 can be communicated.

Next, a specific portion of each embodiment of the present invention will be described. In the first embodiment of the present invention, as shown in FIGS.
And are integrally formed. One connection pipe 40 is attached to one volume section 30, and the optimal sound-absorbing position 41 a of the connection section 41 is located off the connection section between the volume section 30 and the duct 10. In the example of FIG. 1, the connecting pipe 40 is formed separately from the duct 10 and the volume 30, and the connecting pipe 40
Shows a case where the first part 41 and the second part 42 are bent at an intermediate position. In the example of FIG. 2, a case is shown in which the optimal sound-muffling position 41 a is located at a position separated from the connection between the duct 10 and the volume 30. In the example of FIG.
Reference numeral 0 indicates a case in which the sheet passes through the other member 50 other than the resonator.

In the second embodiment of the present invention, as shown in FIGS. 4 and 5, a case where a plurality of (two in the illustrated example of the present invention) connecting pipes 40 are attached to one volume 30 is shown. ing. The volume portion 30 is provided at a place where the installation can be performed.
1a. In the second embodiment of the present invention, as shown in FIG. 4 (shown by a dotted line), one connecting pipe and another connecting pipe may be connected by a communication pipe. In the second embodiment of the present invention, the first connecting portion 41 of each of the plurality of connecting pipes is attached to the duct 10 at the respective sound deadening optimal position 41a. Can be.

In the third embodiment of the present invention, as shown in FIG.
Is partitioned into two by a partition plate 51 inside the first chamber 3.
1 and the second chamber 32, and the first chamber 31 and the second chamber 3
The connection pipes 40 are respectively attached to the connection pipes 2, and the optimal silencing position 41 a of the first connection portion 41 of each connection pipe 40 is provided.
Shows a case where the position is outside the position that is the connection portion between the volume portion 30 and the duct 10 or the shortest route. In the third embodiment of the present invention, the inside of the volume 30 installed in the installable place is divided into a plurality of parts by the partition plate 51, and the connecting pipes 40 are attached to a plurality of chambers partitioned by the partition plate 51, so that a plurality of The sound can be muted at a location or a sound having a different frequency can be muted.

In the fourth embodiment of the present invention, as shown in FIG. 7, one connection pipe 40 is attached to one volume 30 and the optimal noise reduction position 41a of the connection 41 is changed to the volume 30.
FIG. 3 shows a case where the connecting pipe 40 is formed of a bellows member 44 because the connecting pipe 40 is deviated from the connecting portion or the position of the shortest path between the connecting pipe 40 and the duct 10. In the fourth embodiment of the present invention, the connecting pipe 40
Is formed of the bellows member 44, so that even if it is difficult to connect the duct 10 and the volume 30 with the connection pipe 40 whose shape is fixed, the connection can be easily performed. In the fourth embodiment of the present invention, the connecting pipe 40 is formed of the bellows member 44, but a flexible hose such as a rubber hose may be used instead of the bellows member 44.

[0017]

According to the muffler of the first aspect, since the connecting pipe for connecting the duct and the volume is formed separately from the duct and the capacity, the connecting pipe arranged at the optimal position for noise reduction is provided. Regardless of the position of the duct-side opening, the connecting pipe can be easily routed to connect the duct and the volume. According to the muffler of the second aspect, the opening position of the connecting pipe to the duct is provided at a position other than the position where the duct and the volume section are connected to each other or the shortest path. It can be easily selected to the optimal position on the noise reduction. According to the muffler of the third aspect, at least one of the plurality of connecting pipes is provided at a position other than the connecting portion between the duct and the volume or the position that is the shortest path. Can easily be selected as the optimum position for noise reduction. According to the muffler of the fourth aspect, even when the space in which the volume can be secured is at a position away from the duct, the duct and the volume can be connected by the connecting pipe formed separately from the duct and the volume.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a muffler according to a first embodiment of the present invention and the vicinity thereof.

FIG. 2 is a cross-sectional view showing the silencer according to the first embodiment of the present invention, in which the volume has a cylindrical shape surrounding a duct.

FIG. 3 is a cross-sectional view illustrating the silencer according to the first embodiment of the present invention, in which a connecting pipe passes through a space in which other members other than the silencer are installed.

FIG. 4 is a sectional view showing a silencer according to a second embodiment of the present invention and the vicinity thereof.

FIG. 5 is a sectional view showing a muffler according to a second embodiment of the present invention and the vicinity thereof.

FIG. 6 is a sectional view showing a silencer according to a third embodiment of the present invention and the vicinity thereof.

FIG. 7 is a sectional view showing a silencer according to a fourth embodiment of the present invention and the vicinity thereof.

FIG. 8 is a cross-sectional view showing a conventional silencer.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Duct 20 Silencer 30 Volume part 40 Communication pipe 41 1st connection part 41a Optimal noise reduction position 42 2nd connection part

Claims (4)

[Claims] 1. A muffler comprising a duct of a vehicle, a volume, and a connecting pipe connecting the duct and the volume, wherein the connecting pipe is connected to the duct at an optimal position for noise reduction. A silencer, wherein the duct and the volume are formed separately. 2. A muffler comprising a duct of a vehicle, a volume, and a connecting pipe connecting the duct and the volume, wherein the connecting pipe is connected to the duct at an optimal sound-absorbing position. The muffler wherein the optimal sound-absorbing position is a position other than a position that is a connecting portion or a shortest path between the duct and the volume portion. 3. A muffler comprising a duct of a vehicle, a volume, and a plurality of connecting pipes connecting the duct and the volume, wherein at least one of the plurality of connecting pipes is provided. A muffler that is connected to the duct at an optimal sound-absorbing position, and the optimal sound-absorbing position is a position other than a position where the duct is connected to the volume or a shortest path. 4. The muffler according to claim 1, wherein the connection pipe passes through a space in which other members other than the muffler are installed.