JP2008274766A - 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 muffler body 1. The inlet pipe 2 is composed of a straight pipe part 2a arranged in close vicinity to one side in the flat short shaft direction of the shell and an extension pipe part 2 opened toward the other side in the flat short shaft direction L1 of the shell 4 from this straight pipe part 2a. An opening part 9 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 deformation of the shell by equalizing thermal stress applied to the shell having a flat cross section and improving 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 the vehicle silencer, comprising: an inlet pipe for injecting gas; an outlet pipe for exhausting 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. The pipe is composed of a straight pipe portion arranged close to one side of the flat short axis direction of the shell and an extension pipe portion opened from the straight pipe portion toward the other side of the flat short axis direction of the shell. In addition, the baffle plate shell is provided with an opening that brings the adjacent silencing chambers into communication with each other at a position close to the other side of the flat short axis direction of the shell. That.

  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 The straight pipe portion disposed adjacent to one side of the flattened short axis direction of the shell, and the extension pipe portion opened from the straight pipe portion toward the other flat side of the flat short axis direction of the shell The shell of the flat cross section is provided at a position close to the other side of the flat short axis direction of the shell of the baffle plate, which makes the adjacent silencing chambers communicate with each other. Thermal stress can prevent deformation of the shell to equalize, 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, so that three silencer chambers R 1 to R 3 are formed in the silencer body 1.

  The inlet pipe 2 is composed of a straight pipe portion 2a penetrating the end plates 5, 6 and the baffle plates 7, 8, and an extension pipe portion 2b bent downward from the straight pipe portion 2a. The other end is communicated with the muffler chamber R1.

  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 disposed in a state of penetrating one side (upper) on the short axis L1 of the shell 4 in each of the baffle plates 7 and 8, while the outlet pipe 3 Are arranged in a state of penetrating one side (upper side) of the shell 4 that is laterally removed from the short axis L1 of the shell 4 at a position somewhat lower than the inlet pipe 2.

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, exhaust gas (shown by a one-dot chain line arrow) flowing into the silencer body 1 from one end of the inlet pipe 2 is first a straight pipe portion. After flowing into the silencing chamber R1 from 2a through the straight pipe section 2b, the outlet pipe is subjected to expansion and contraction while passing through the openings 9 in the order of the silencing chamber R2 and the silencing chamber R3. 3 is discharged to the outside through a tail pipe (not shown).

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 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 is directly applied to the lower part of the shell 4 from the extension pipe portion 2b of the inlet pipe 2 and flows into the noise reduction chamber R1. After that, since the exhaust gas is circulated through the openings 9 in the order of the silencer chamber R2 and the silencer chamber R3, the lower part of the shell 4 can be heated by being exposed to the exhaust gas. The shell 4 can be prevented from being deformed by uniformly expanding and contracting in the vertical direction.

  Therefore, the durability of the shell 4 and thus 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 includes a straight pipe portion 2a disposed close to one side in the flat minor axis direction of the shell, Consists of an extension pipe part 2b opened from the straight pipe part 2a toward the other side of the flat short axis direction L1 of the shell 4, and is close to the other side of the flat side of the short axis L1 of the shell 4 of the baffle plates 7, 8 Mute adjacent to Since an opening portion 9 which R1~R3 with each other in the communicating state, can be prevented evenly to deform the shell 4 the thermal stress on the shell 4 of the flat cross section, it is possible to improve the durability.

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 the inside of the silencer body according to the second embodiment of the present invention.

  In the second embodiment, instead of the extension pipe portion 2b described in the first embodiment, the extension pipe portion 20 is extended from a midway portion of the straight pipe portion 2b of the inlet pipe 2 toward the lower side of the shell 4 of the noise reduction chamber R2. On the other hand, it differs from Example 1 in that the opening 9 of the baffle plate 8 is omitted and the tip 21 of the straight pipe portion 2a is communicated with the sound deadening chamber R1.

  Therefore, the exhaust gas (shown by the one-dot chain line arrow) flowing into the straight pipe portion 2a of the inlet pipe 1 can be directly applied to the lower portion of the shell 4 from the extension pipe portion 20 and the sound energy of the exhaust gas from the tip portion 21. It is possible to obtain an effect that (which is indicated by a broken line arrow) can be reduced by an expansion action by flowing into the silencer chamber R1.

  Thereby, thermal expansion and contraction can be performed around the longitudinal center of the shell 4, and the shell 4 can transmit heat more evenly than the first embodiment.

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, but the thickness of the flange portion is around 1 mm even if the flange portion 10 is left and provided inside. Therefore, the same effect can be obtained. In this case, the rigidity around the opening 9 can be maintained, and the shell 4 can be evenly supported from the inside.

  Moreover, you may employ | adopt the punching hole comprised by the some small hole instead of the opening part 9. FIG.

Further, the flow of exhaust gas in the silencer main 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.
For example, it is naturally conceivable to provide a bracket for fixing and supporting the extension pipe portion.

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 effect | action of the present Example 1. FIG.

Explanation of symbols

R1, R2, R3 Silencer chamber X1, X2, X3 Welding 1 Silencer body 2 Inlet pipe 2a Straight pipe part 2b Extension pipe part 3 Outlet pipe 4 Shell 4a Lower inner surface 5, 6 End plate 7, 8 Baffle plate 9 Opening part 10 Flange 20 Extension tube 21 Tip

Claims (1)

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,
A straight pipe portion arranged close to one side of the flat short axis direction of the shell, and an extension pipe portion opened from the straight pipe portion toward the other side of the flat short axis direction of the shell; Consisting of
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.

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