JP2007092628A - Muffler for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a muffler for a vehicle capable of reducing radiation noise by increasing the rigidity of an end plate and easily and firmly fixing the end plate and a bracket. <P>SOLUTION: In the muffler for the vehicle having a muffler body 1 composed of a tubular shell 2 and the end plates 3, 4 blocking both end parts of the shell 2, and having the muffler body 1 mounted on the vehicle side via bar shaped brackets B1, B2 fixed on the end plates 3, 4, bead parts 13a-13e projecting to an inside of the muffler body 1 are formed on the end plates 3, 4 and the brackets B1 (B2) are fixed under a condition that the same is put on a recess part 14a(14b) formed outside of the bead part 13b (13e). <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a muffler for a vehicle.

Conventionally, a silencer body of a silencer for a vehicle is composed of a cylindrical shell and end plates that respectively close both ends of the shell, and is mounted on the vehicle side via a rod-like bracket fixed to the end plate. (See Patent Documents 1 and 2).
Japanese Patent Application Laid-Open No. 11-342753 Japanese Patent Laid-Open No. 11-301288

However, the conventional vehicle silencer has a problem that the end plate vibrates due to the pulsation of the exhaust gas, and the vibration is transmitted to the shell, so that radiated sound is easily generated.
In addition, the conventional vehicle silencer has a structure in which a rod-like bracket having a circular cross section is fixed to a flat or curved end plate by welding, so that the workability of welding is poor, and it is desired to fix both easily and firmly. There was a request.

  The present invention has been made to solve the above-mentioned problems, and the object of the present invention is to improve the rigidity of the end plate to reduce the radiation noise, and at the same time, easily and firmly fix the end plate and the bracket. It is providing the silencer for vehicles which can be performed.

  According to the first aspect of the present invention, the silencer body is composed of a cylindrical shell and end plates that respectively close both ends of the shell, and the silencer body is fixed to the end plate. In the vehicle silencer mounted on the vehicle side through the bead, a bead portion protruding to the inside of the silencer body is formed on the end plate, and the bracket is overlaid on a recess formed outside the bead portion. It is characterized by being fixed.

  In the first aspect of the present invention, the silencer body is composed of a cylindrical shell and an end plate that closes both ends of the shell, and the silencer body is fixed to the end plate. In a vehicle silencer mounted on a vehicle side via a rod-shaped bracket, a bead portion that protrudes to the inside of the silencer body is formed on the end plate, and the bracket is overlaid on a recess formed outside the bead portion. Since the end plate is fixed in a fixed state, the rigidity of the end plate can be improved to reduce radiation noise, and at the same time, the end plate and the bracket can be fixed easily and firmly.

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

Example 1 will be described below.
1 is a perspective view illustrating a vehicle silencer according to a first embodiment of the present invention, FIG. 2 is a perspective view illustrating the inside of the vehicle silencer according to the first embodiment, and FIG. 3 is a vehicle silencer according to the first embodiment. FIG. 4 is a cross-sectional view for explaining the inside of the vessel, explaining the operation, and FIG. 4 is an exploded perspective view of the end plate and the bracket.

First, the overall configuration will be described.
As shown in FIGS. 1 to 3, in the vehicle silencer of the first embodiment, the silencer body 1 includes a shell 2, two end plates 3 and 4, and three baffle plates 5, 6, and 7. And an inlet pipe 8, an outlet pipe 9, and brackets B 1 and B 2, which are formed in a flat tubular shape whose length in the vehicle vertical direction is extremely short relative to the length in the vehicle width direction.

The shell 2 is provided in a state in which a metal plate is wound around the outer peripheries of end plates 3 and 4 and baffle plates 5, 6 and 7, which will be described later. The four bead grooves 2a to 2d are formed, whereby the rigidity of the shell 2 is greatly improved.
The silencer body 1 surrounded by the shell 2 and the end plates 3 and 4 is provided with metal plate baffle plates 5, 6, and 7, and a plurality of these baffle plates 5, 6, and 7 are respectively provided. The opening 10 is formed.
Accordingly, four chambers R1, R2, R3, and R4 are formed in the silencer and communicate with each other through the openings 10 of the baffle plates 5, 6, and 7, respectively.

  The inlet pipe 8 is used to allow exhaust gas to flow into the silencer body 1 and is provided in a state of penetrating from the side of the shell 2 to the chamber R3 in the silencer via a substantially cylindrical adapter 20. It has been.

Further, the tip of the inlet pipe 8 is in a state of being blocked by the cap member 11. The cap member 11 may be provided with a small hole having a small diameter.
The inlet pipe 8 is formed with a plurality of punching holes 12 that are opened only to the side.

  The outlet pipe 9 discharges the exhaust gas in the silencer body 1 and is provided in a state of passing through the end plate 4 and the baffle plates 5, 6, and 7 and communicating with the chamber R4.

As shown in FIG. 4, the end plate 3 is formed in a dish shape, and bead portions 13 a to 13 b projecting in a substantially semicircular shape toward the inside of the silencer main body 1 are formed on the side surfaces thereof.
Moreover, the bead parts 13a-13e are formed over the whole vehicle up-down direction length of the end plate 3, and, thereby, especially the rigidity of the vehicle up-down direction of the end plate 3 is improving significantly.
The end plate 4 is also formed with bead portions 13a to 13e in the same manner as the end plate 3, whereby the rigidity of the end plate 4 particularly in the vehicle vertical direction is greatly improved. The end plate 4 has a through hole 4a (see FIG. 3) for allowing the outlet pipe 9 to pass therethrough.

  The brackets B1 and B2 are formed in a rod shape with a circular cross section, and the base portion thereof is formed with a vertical fixing portion 15 and is bent so as to be bent from the fixing portion 15 to the tip portion and extend in the vehicle width direction. ing.

And it fixed with welding X1 in the state where the fixing | fixed part 15 of bracket B1 was piled up to the recessed part 14a formed in the outer side of the bead part 13b of the end plate 3, and was formed in the outer side of the bead part 13e of the end plate 3. The fixing portion 15 of the bracket B2 is overlapped with the recess 14b and is fixed by welding X2.
In addition, the end plates 3 and 4 of the first embodiment have their respective opening-side end portions inserted and arranged inside the shell 2, and each outer peripheral portion is welded to both ends of the shell 2 and welds X3 and X4 (see FIG. However, this is not the case.

Next, the operation will be described.
The silencer body 1 constructed in this way has an inlet pipe 8 connected to a connecting pipe (not shown) on the engine side, an outlet pipe 9 connected to a tail pipe (not shown), bracket B1, The front end of B2 is mounted in a state of being connected to the vehicle side via a mounting rubber (not shown).

As shown in FIG. 3, the exhaust gas (shown by a wavy arrow) that flows into the inlet pipe 8 from the connection pipe on the engine side flows into the chamber R3 in the silencer through the punching hole 12 of the inlet pipe 8. It will be expanded when you do.
Next, the sound is silenced while being subjected to expansion and contraction while flowing between the chambers R1, R2, R3, and R4 through the openings 10 of the baffle plates 5, 6, and 7, and then the tail pipe is removed from the outlet pipe 9. It is discharged to the outside through.

Here, in the conventional invention, there is a problem that the end plate vibrates due to the exhaust gas pulse operation, and this vibration is transmitted to the shell to easily generate a radiated sound.
Such a problem is particularly likely to occur when the silencer body is a flat tube, and the end plate vibrates due to insufficient rigidity against the stress in the vehicle vertical direction, and the shell vibrates in accordance with this vibration. It is known to be caused.

  In addition, conventional vehicle silencers have a structure in which a rod-shaped bracket with a circular cross section is fixed to a flat or curved end plate by welding, so that the workability of welding is poor and both are fixed more easily and firmly. There was a request to do.

  However, in the vehicle silencer of the first embodiment, the end plates 3 and 4 have bead portions 13a to 13e, respectively, and the rigidity in the vehicle vertical direction is greatly improved. Therefore, there is no possibility of vibration with the shell 2, and the radiated sound can be reduced.

  Further, the fixing portion 15 of the bracket B1 is fixed to the concave portion 14a of the bead portion 13c by welding X1, and the fixing portion 15 of the bracket B2 is overlapped to the concave portion 14b of the bead portion 13d. Therefore, welding X1 and X2 can be easily and firmly performed in a state where the brackets B1 and B2 are positioned without using a fixing jig or the like.

Next, the effect will be described.
As described above, in the vehicle silencer according to the first embodiment, the silencer body 1 includes the cylindrical shell 2 and the end plates 3 and 4 that respectively close both ends of the shell 2. In the muffler for vehicles mounted on the vehicle side via the rod-like brackets B1 and B2 fixed to the end plates 3 and 4, the muffler body 1 is placed on the inside of the silencer body 1 on the end plates 3 and 4. Since the protruding bead portions 13a to 13e are formed and the bracket B1 (B2) is fixed in a state of being overlapped with the concave portion 14a (14b) formed outside the bead portion 13b (13e), the rigidity of the end plates 3 and 4 is increased. It can improve and reduce radiated sound, and at the same time, the end plates 3 and 4 and the brackets B1 and B2 can be fixed easily and firmly.

  Further, since the silencer body 1 is formed in a flat tubular shape and the bead portions 13a to 13e are formed in the direction perpendicular to the flat longitudinal direction of the end plates 3 and 4, the end in the case where the silencer main body 1 is a flat tubular shape. This is suitable for improving the rigidity of the plates 3 and 4.

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 the scope not departing from the gist of the present invention are included in the present invention.
For example, the number of formed bead portions, the forming position, and the detailed cross-sectional shape of the recess can be set as appropriate, and the fixing position and cross-sectional shape of the bracket can also be set as appropriate.
In the first embodiment, the brackets B1 and B2 are fixed to the end plate 3, but may be fixed to the end plate 4.
Further, in the first embodiment, the flat tubular vehicle silencer has been described. However, it may be a columnar shape or a substantially triangular column shape, and the internal structure of the vehicle silencer including these can be appropriately set.
Furthermore, the muffler for a vehicle can be set as appropriate even if the vehicle up-down direction and the vehicle width direction are different from those of the first embodiment in the mounting direction.

It is a perspective view which shows the silencer for vehicles of Example 1 of this invention. It is a perspective view explaining the inside of the silencer for vehicles of the present Example 1. It is sectional drawing explaining the inside of the silencer for vehicles of the present Example 1, and is a figure explaining an effect | action. It is an exploded view of an end plate and a bracket.

Explanation of symbols

R1, R2, R3, R4 Chamber 1 Vehicle silencer 2 Shell 2a Bead groove 3, 4 End plate 5, 6, 7 Baffle plate 8 Inlet pipe 9 Outlet pipe 10 Opening portion 11 Cap member 12 Punching holes 13a, 13b, 13c , 13d Bead portion 14a, 14b Recess 20 Adapter

Claims (1)

The silencer body is composed of a cylindrical shell and end plates that respectively close both ends of the shell,
In the vehicle silencer mounted on the vehicle side through a rod-shaped bracket fixed to the end plate, the silencer body,
Form a bead portion projecting to the inside of the silencer body on the end plate
A muffler for a vehicle, wherein the bracket is fixed in a state where it is overlapped with a recess formed outside the bead portion.

Images