JP2008274767A - Vehicular muffler - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicular muffler capable of improving durability, by preventing deformation of a shell, by equalizing thermal stress applied to the shell of a flat cross section. <P>SOLUTION: This vehicular muffler has a muffler body 1 composed of the cylindrical shell 4 having the flat cross section and end plates 5 and 6 blocking up opening end parts on both sides of the shell 4, an inlet pipe 2 making exhaust gas flow in the muffler body 1, an outlet pipe 3 exhausting the exhaust gas from the muffler body 1, and baffle plates 7 and 8 forming a plurality of muffling chambers R1-R3 by partitioning the muffle body 1. The inlet pipe 2 is arranged in close vicinity to one side in the flat short shaft L1 direction of the shell 4, and an opening part 8 for putting the mutual adjacent muffling chambers R1-R3 in a communicating state, is arranged in a position in close vicinity to the other side in the flat short shaft L1 direction of the shell 4 of the baffle plates 7 and 8. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a muffler for a vehicle.

Conventionally, a silencer body composed of a cylindrical shell having a flat cross section, end plates closing the open ends on both sides of the shell, an inlet pipe for flowing exhaust gas into the silencer chamber, and a silencer chamber 2. Description of the Related Art A vehicle silencer that includes an outlet pipe that discharges exhaust gas and a baffle plate that partitions a silencer chamber to form a plurality of silencer chambers is known (see Patent Document 1).
JP 2002-364332 A

However, in the conventional invention, one side of the short axis direction of the shell in which the inlet pipe into which high-temperature exhaust gas flows is arranged repeats thermal expansion / contraction greatly compared to the other side of the short axis direction, so that the shell is There is a possibility that the durability is lowered due to plastic deformation in an arcuate shape.
In addition, since both sides of the long axis direction of the shell are relatively high in rigidity, there is no such concern, and even when the shell has a circular cross section, the thermal stress is relieved substantially evenly, so there is no such concern. .

  The present invention has been made in order to solve the above-mentioned problems, and the object of the present invention is for a vehicle capable of preventing the deformation of the shell by equalizing the thermal stress applied to the shell having a flat cross section and improving the durability. It is to provide a silencer.

  According to the first aspect of the present invention, a silencer body composed of a cylindrical shell having a flat cross section, end plates closing the open ends on both sides of the shell, and exhausting the silencer body In a vehicle silencer comprising: an inlet pipe through which gas flows in; an outlet pipe from which exhaust gas is discharged from the silencer body; and a baffle plate that partitions the interior of the silencer body to form a plurality of silencer chambers. An opening in which the inlet pipe is arranged close to one side of the flat short axis direction of the shell, and the adjacent silencer chambers are in communication with each other at a position close to the other side of the flat short axis direction of the shell of the baffle plate It is characterized by having provided.

  In the first aspect of the present invention, the silencer body comprising a cylindrical shell having a flat cross section, and end plates that close the open ends on both sides of the shell, and the silencer In a vehicle silencer comprising: an inlet pipe for flowing exhaust gas into a main body; an outlet pipe for discharging exhaust gas from the silencer body; and a baffle plate that partitions the interior of the silencer body to form a plurality of silencer chambers , At least the inlet pipe is arranged close to one side of the flattened short axis direction of the shell, and the adjacent silencer chambers are in communication with each other at a position close to the flattened short axis direction of the shell of the baffle plate. Since the opening to be provided is provided, the thermal stress applied to the shell having a flat cross section can be made uniform to prevent the deformation of the shell, and the durability can be improved.

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

Example 1 will be described below.
1 is a plan sectional view for explaining the interior of a vehicle silencer according to a first embodiment of the present invention, FIG. 2 is a sectional view taken along line S2-S2 in FIG. 1, and FIG. 3 is a sectional view taken along line S3-S3 in FIG. FIG. 4 is a side sectional view for explaining the interior of the vehicle silencer according to the first embodiment of the present invention.

First, the overall configuration will be described.
As shown in FIG. 1, the vehicle silencer according to the first embodiment includes a silencer body 1, an inlet pipe 2, and an outlet pipe 3, all of which are made of metal.

  The silencer body 1 includes a shell 4 formed in a cylindrical shape with a flat cross section, and end plates 5 and 6 that close open end portions on both sides of the shell 4.

  In the silencer body 1, two plate-like baffle plates 7 and 8 are provided, thereby forming three divided silencer chambers R 1 to R 3 in the silencer body 1.

  The inlet pipe 2 is in a state of passing through the end plate 5 and the baffle plates 7 and 8 and having one end connected to a connection pipe on the engine side (not shown) and the other end communicating with the sound deadening chamber R1. Is provided.

  The outlet pipe 3 is provided in a state of passing through the end plate 6 and the baffle plates 7 and 8 and having one end connected to a tail pipe (not shown) and the other end communicating with the sound deadening chamber R3. Yes.

As shown in FIGS. 2 and 3, the inlet pipe 2 is arranged in a state of penetrating one side (upper side) of the baffle plates 7 and 8, which is laterally removed from the short axis L 1 of the shell 4. The outlet pipe 3 is disposed at a position somewhat lower than the inlet pipe 2 so as to penetrate one side (upper side) of the shell 4 from the side opposite to the outlet 3 from the short axis L1 of the shell 4.
The inlet pipe 2 may be arranged on one side (upper side) on the short axis L1, or the inlet pipe 2 and the outlet pipe 3 may be arranged symmetrically with respect to the short axis L1.

Further, on the other side (lower side) of the shell 4 in the short axis L1 direction in each of the baffle plates 7 and 8, a long hole-like opening 9 is formed that is cut out along the lower inner surface 4a of the shell 4. .
Note that the shape, area, and the like of the opening 9 can be set as appropriate.

In addition, both ends of the shell 4 of the first embodiment are fixed to the outer peripheral portions of the corresponding end plates 5 and 6 by welding X1 over the entire circumference.
In addition, the flange portion 10 refracted in the axial direction of the shell 4 and the shell 4 are fixed by spot welding (not shown) at portions other than the openings 9 of the baffle plates 7 and 8, whereby the shell 4 is attached to each baffle. It is supported from the inside by plates 7 and 8.
The inlet pipe 2 is fixed to the end plate 5 by welding X2 over the entire circumference, while the outlet pipe 3 is fixed to the end plate 6 by welding X3 over the entire circumference.
Further, the inlet pipe 2 and the outlet pipe 3 are fixed to the baffle plates 7 and 8 by welding (not shown).
The welding described above may use a method such as caulking.

Next, the operation will be described.
In the vehicle silencer configured as described above, as shown in FIG. 4, the exhaust gas (shown by a one-dot chain line arrow) flowing into the silencer main body 1 from one end of the inlet pipe 2 is first silenced chamber R1. Then, the sound is silenced by the expansion and contraction action while flowing through the opening 9 in the order of the silencer chamber R2 and the silencer chamber R3, and then, from the tail pipe (not shown) to the outside via the outlet pipe 3. Discharged.

Here, in the conventional invention, the shell in which the inlet pipe into which the high-temperature exhaust gas flows is arranged has one side in the short axis direction repeatedly greatly expanded and contracted compared to the other side in the short axis direction. However, there is a possibility that the plasticity is deformed in a bow shape and the durability is lowered.
In the first embodiment, since the outlet pipe 3 is also provided on one side of the shell 4 in the short axis L1 direction, thermal stress tends to concentrate particularly above the shell 4.

  On the other hand, in the first embodiment, although the upper part of the shell 4 is heated by the inlet pipe 2, the exhaust gas that has flowed into the silencing chamber R 1 through the inlet pipe 2 is passed through each opening 9 to the silencing chamber R 2 and the silencing. Since the chambers R3 are circulated in the order, the lower part of the shell 4 can be heated by being exposed to the exhaust gas, and thereby the shell 4 can be thermally expanded and contracted uniformly in the vertical direction of the shell 4 to deform the shell 4. Can be prevented.

  Therefore, the durability of the shell 4 and the durability of the silencer body 1 can be improved.

  Moreover, since the opening part 9 is made into the shape of a long hole along the lower inner surface 4a of the shell 4, the lower part of the shell 4 can be heated uniformly, which is preferable.

Next, the effect will be described.
As described above, in the vehicle silencer of the first embodiment, the cylindrical shell 4 having a flat cross section, and the end plates 5 and 6 for closing the open end portions on both sides of the shell 4 are provided. A silencer body 1 composed of: an inlet pipe 2 for flowing exhaust gas into the silencer body 1; an outlet pipe 3 for discharging exhaust gas from the silencer body 1; In the vehicle silencer including the baffle plates 7 and 8 that form the silencing chambers R1 to R3, the inlet pipe 2 is disposed close to one side of the flat minor axis L1 of the shell 4, and the baffle plates 7 and 8 are Since the opening part 9 which makes the adjacent silencer chambers R1 to R3 communicate with each other is provided at a position close to the other side in the flat minor axis L1 direction of the shell 4, the thermal stress applied to the shell 4 having a flat cross section is made uniform. Shell 4 strange A can be prevented, it is possible to improve the durability.

  Moreover, since the opening part 9 was provided along the lower inner surface 4a of the shell 4, the lower part of the shell 4 can be heated equally, and it becomes suitable.

Example 2 will be described below.
In the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, the description thereof will be omitted, and only differences will be described in detail.

  FIG. 5 is a diagram illustrating punching holes according to the second embodiment of the present invention.

  The second embodiment is different from the first embodiment in that the opening 9 described in the first embodiment is replaced with a punching hole 20 configured by a plurality of small holes.

  Therefore, in addition to the same effects as those of the first embodiment, it is possible to further improve the silencing effect due to the expansion / contraction action of the silencing chambers R1 to R3.

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 first and second embodiments, the flange portion 10 of the baffle plates 7 and 8 is omitted around the opening 9 (punching hole). However, even if the flange portion 10 is left and provided inside, the thickness of the flange portion is Since it is around 1 mm, the same effect can be obtained. In this case, the rigidity around the opening 9 (punching hole) can be maintained, and the shell 4 can be supported uniformly from the inside.

  Further, the flow of exhaust gas in the silencer body is arbitrary for the (silencer structure), and all the design changes of the constituent members accompanying these are within the scope of the present invention.

It is a plane sectional view explaining the inside of the silencer for vehicles of Example 1 of the present invention. It is sectional drawing in the S2-S2 line | wire of FIG. It is sectional drawing in the S3-S3 line | wire of FIG. It is a sectional side view explaining the inside of the silencer for vehicles of Example 1 of the present invention. It is a figure explaining the punching hole of Example 2 of this invention.

Explanation of symbols

R1, R2, R3 Silencer chamber X1, X2, X3 Welding 1 Silencer body 2 Inlet pipe 3 Outlet pipe 4 Shell 4a Lower inner surface 5, 6 End plate 7, 8 Baffle plate 9 Opening portion 10 Flange portion 20 Punching hole

Claims (2)

A silencer body composed of a cylindrical shell having a flat cross-section, and end plates that close open end portions on both sides of the shell;
An inlet pipe for flowing exhaust gas into the silencer body;
An outlet pipe for discharging exhaust gas from the silencer body,
In a vehicle silencer comprising a baffle plate that divides the silencer body to form a plurality of silencer chambers,
At least the inlet pipe is arranged close to one side of the flat minor axis direction of the shell,
A muffler for a vehicle, wherein an opening for connecting adjacent muffler chambers to each other is provided at a position close to the other side of the flat short axis direction of the shell of the baffle plate. The muffler for a vehicle according to claim 1,
A muffler for a vehicle, wherein the opening is provided along the inner surface of the shell.

Images