JP2008128197A - Drainage structure of muffler for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide drainage structure of a muffler for a vehicle, enlarging the degree of flexibility of layout in a muffler body, stably fixing and supporting a drainage pipe, facilitating maintenance, reducing repair cost, and improving drainage properties. <P>SOLUTION: An inlet pipe 2 flowing exhaust gas into a muffling chambers R1 to R3, and a tail pipe 4 projected from the muffler body 1 to discharge the exhaust gas in the muffling chambers R1 to R3 to the outside are provided. A drainage pipe 5 is disposed to the outside of the muffler body 1. One end part 5a of the drainage pipe 5 communicates to the muffling chambers R1 to R3 with one end part 5a abutted with or close to a bottom part 6a of a shell 6, and the other end part 5b thereof communicates to a projection part of the tail pipe 4. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a drainage structure for a vehicle muffler.

Conventionally, by providing a drain pipe on the outlet pipe in the muffler body toward the bottom of the shell, the condensed water accumulated at the bottom of the shell using the intake pressure of the exhaust gas flowing through the outlet pipe is removed from the drain pipe. A technique of a drainage structure for a vehicle muffler that is discharged to the outside together with exhaust gas after flowing into a pipe is known (see Patent Documents 1 to 4).
JP 2006-112327 A JP 2004-285916 A Japanese Utility Model Laid-Open No. 1-142513. Japanese Utility Model Publication No. 58-8711.

  However, in the conventional invention, since the drain pipe is disposed in the muffler main body, there is a problem that the degree of freedom of layout in the muffler main body becomes narrow.

In addition, one end of the drain pipe is connected to the outlet pipe, while the other end is in a free end state, which is unstable.
In addition, since the inside of the muffler body is not visible from the outside, if a crack or breakage occurs in the connection part of the drain pipe and outlet pipe, it will not be known until the drain pipe drops off from the outlet pipe. The actual repair becomes a replacement work of the muffler body, and the repair cost is high.

  The present invention has been made in order to solve the above-mentioned problems, and the object of the present invention is to increase the degree of freedom of layout in the muffler body, to stably fix and support the drain pipe, maintainability and repair cost. It is to provide a drainage structure for a vehicle muffler that can realize reduction and improvement in drainage.

  According to the first aspect of the present invention, a muffler body having a muffler chamber, an exhaust gas upstream pipe connected to an engine-side connecting pipe and allowing exhaust gas to flow into the muffler chamber, and the muffler The exhaust pipe is provided in a state of protruding from the main body and has an exhaust gas downstream pipe for discharging the exhaust gas of the muffler chamber to the outside. One end of the pipe is in contact with the bottom of the muffler main body. Alternatively, there is provided a drain pipe connected in communication with the sound deadening chamber in the close proximity and having the other end connected in communication with the protruding portion of the exhaust gas downstream pipe.

  According to the first aspect of the present invention, a muffler body having a muffler chamber, an exhaust gas upstream pipe connected to an engine-side connecting pipe and allowing exhaust gas to flow into the muffler chamber, and the muffler The exhaust pipe is provided in a state of protruding from the main body and has an exhaust gas downstream pipe for discharging the exhaust gas of the muffler chamber to the outside. One end of the pipe is in contact with the bottom of the muffler main body. Alternatively, since a drain pipe is connected in communication with the muffler chamber in the close state, and the other end is connected in communication with the protruding portion of the exhaust gas downstream pipe, the flexibility of layout in the muffler body is increased. Stable fixing support of drain pipes, reduction of maintenance and repair costs, and improvement of drainage can be realized.

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

Example 1 will be described below.
FIG. 1 is an overall view showing a drainage structure of a vehicle muffler according to a first embodiment of the present invention.

First, the overall configuration will be described.
As shown in FIG. 1, in the drainage structure for a vehicle muffler according to the first embodiment, a muffler body 1, an inlet pipe 2 (corresponding to an exhaust gas upstream pipe in claims), an outlet pipe 3, and a tail pipe 4 (Corresponding to the exhaust gas downstream pipe in the claims) and the drain pipe 5 are provided, and are all made of metal.

  The muffler body 1 includes a cylindrical shell 6, end plates 7 and 8 that close both ends of the shell 6, and baffle plates 9 and 10 that also serve as partition members and reinforcing members in the shell 6. Thereby, the inside of the muffler main body 1 is partitioned into three sound deadening chambers R1 to R3.

Each end plate 7, 8 is formed in a substantially dish shape with flange portions 7 a, 8 a inserted inside the end portion of the shell 6 on the outer periphery, and each flange portion 7 a, 8 a It is fixed to the corresponding end by welding X1 over the entire circumference.
The flange portions 7a and 8a of the end plates 7 and 8 may be fixed to the corresponding end portions of the shell 6 by lock seam processing.

Each baffle plate 9, 10 has a flange portion 9 a, 10 a erected in the longitudinal direction of the muffler body 1 on the outer periphery thereof and is formed in a substantially dish shape, and each flange portion 9 a, 10 a is provided at a plurality of locations on the shell 6. Are fixed by spot welding X2.
In addition, communication holes 9b and 10b are provided in the middle part of the baffle plates 9 and 10 so that the adjacent silencer chambers R1 to R3 communicate with each other, while the adjacent silencer chambers R1 to R3 communicate with each other at the bottom. A communication hole outside the figure is provided.

The inlet pipe 2 is arranged in a state of passing through the burring portions 9c, 10c of the baffle plates 9, 10, and the exhaust gas upstream side end portion penetrates the burring portion 7b of the end plate 7 and protrudes to the outside. On the other hand, the exhaust gas downstream end is provided in communication with the muffler chamber R1.
The inlet pipe 2 is fixed to the burring portion 7b of the end plate 7 by welding X3 over the entire circumference, and is fixed to the burring portions 9c and 10c of the baffle plates 9 and 10 by welding X4 over the entire circumference. Is done. The baffle plates 9, 10 and the inlet pipe 2 may be fixed by caulking with a ridge lock structure.

The outlet pipe 3 is arranged in a state of passing through the burring portions 9d, 10d of the baffle plates 9, 10, and the exhaust gas downstream side end portion of the baffle plates 9, 10 protrudes through the burring portion 8b of the end plate 8. On the other hand, the exhaust gas upstream end is provided in communication with the muffler chamber R3.
The outlet pipe 3 is fixed to the burring portion 8b of the end plate 8 by welding X5 over the entire circumference, and is fixed to the burring portions 9d and 10d of the baffle plates 9 and 10 by welding X6 over the entire circumference. Has been. The baffle plates 9 and 10 and the outlet pipe 3 may be fixed by caulking with a ridge lock structure.
Further, the exhaust pipe downstream end of the outlet pipe 3 is inserted inside the exhaust pipe upstream end of the tail pipe 4, and is fixed together by the above-described welding X 6 over the entire circumference of the tail pipe 4. Yes.

  One end portion 5a of the drain pipe 5 is provided in a state where it passes through a through hole 8c formed in the lower portion of the end plate 8 and communicates with the sound deadening chamber R1 and close to the bottom portion 6a of the shell 6. The end portion 5 b is connected in communication with a through hole 4 a formed in the bottom portion of the tail pipe 4.

  Furthermore, a part 5 c in the middle of the drain pipe 5 is in a state of being close along the outer surface of the end plate 8. Note that the middle portion 5c may be brought into contact with the outer surface of the end plate 8.

  In addition, one end 5a of the drain pipe 5 is fixed by welding X7 over the entire circumference of the through hole 8a, and the other end 5b is fixed by welding X8 over the entire circumference of the through hole 4a. .

  In the first embodiment, a gap having a dimension L1 (around 1 mm) is formed between the one end 5a of the drain pipe 5 and the bottom 6a of the shell 6. However, the one end 5a of the drain pipe 5 is It may be inclined and brought into contact with the bottom 6a of the shell 6.

  In addition, the muffler body 1 is arranged in a slightly inclined state so that the engine-side connecting pipe (not shown) communicates with the inlet pipe 2 when mounted on the vehicle, and the muffler chamber R1 side is lowered. .

  Accordingly, in the first embodiment, since the drain pipe 5 is provided outside the muffler body 1 as compared with the conventional invention, the degree of freedom of layout in the muffler body 1 can be expanded.

One end 5a of the drain pipe 5 is fixed by welding X7 over the entire circumference of the through hole 8a, while the other end 5b is fixed by welding X8 over the entire circumference of the through hole 4a. It becomes support and can fix the drain pipe 5 in the stable state.
In addition, the state of the welds X7 and X8 can be inspected from the outside, and when the welds X7 and X8 are cracked or damaged, they can be repaired easily, providing excellent maintainability and low repair costs. Can be suppressed.

Next, the operation will be described.
In the vehicle muffler configured as described above, as shown in FIG. 1, engine exhaust gas (shown by broken line arrows) flows into the muffler chamber R1 via the inlet pipe 2 from the connection pipe on the engine side (not shown). By doing so, the silencing effect by the expansion action is obtained.

  Next, the exhaust gas flowing into the silencer chamber R1 flows in the order of the silencer chamber R2 and the silencer chamber R3 through the communication holes 9b, 10b of the baffle plates 9, 10, thereby obtaining a noise reduction effect due to expansion and contraction. It is done.

  Further, the exhaust gas flowing into the muffler chamber R3 is exhausted to the outside through the outlet pipe 3 and the tail pipe 4.

  Here, after the engine is stopped, the condensed water which is condensed by cooling the moisture contained in the exhaust gas in the muffler body 1 passes through the shell 6, end plates 7 and 8, baffle plates 9 and 10, etc. due to its own weight. The condensed water that has moved to the bottom 6a of the shell 6 of the R1, R2, R3 and moved to the bottom 6a of the shell 6 of the silencer R2, R3 passes through the communication holes at the bottom of the baffle plates 9, 10, respectively. Move to the bottom 6a of the shell 6 of R1.

  When the engine is started again, after the condensed water (shown by a one-dot chain arrow) flows into the tail pipe 4 through the drain pipe 5 by the intake pressure of the exhaust gas passing through the tail pipe 4, the exhaust gas And it is discharged outside.

  At this time, in the first embodiment, since it is not necessary to secure a clearance in consideration of contact between the drainage pipe and the shell and an error in assembling parts in comparison with the conventional invention, one end of the drainage pipe 5 is used. The part 5a can be provided in the state close to the bottom part 6a of the shell 6, and drainage can be improved.

  Further, since the middle portion 5c of the drain pipe 5 is arranged along the end plate 8, the condensed water in the drain pipe 5 can be warmed by the heat transmitted from the end plate, thereby freezing the condensed water. Can be prevented.

Next, the effect will be described.
As described above, in the vehicle muffler drainage structure according to the first embodiment, the muffler body 1 having the muffler chambers R1 to R3 and the connection pipe on the engine side and the muffler chambers R1 to R3 are connected. The muffler main body 1 is provided with an inlet pipe 2 for allowing exhaust gas to flow into the muffler main body 1 and a tail pipe 4 provided so as to protrude from the muffler main body 1 and for discharging the exhaust gas in the muffler chambers R1 to R3 to the outside. The other end 5b is connected to the protruding portion of the tail pipe 4 in communication with the sound deadening chambers R1 to R3 with one end 5a close to the bottom 6a of the muffler body 1 (shell 6). Since the drain pipe 5 is provided, it is possible to increase the degree of freedom of layout in the muffler body 1, stably fix and support the drain pipe 5, reduce maintenance and repair costs, and improve drainage.

  In addition, since the middle part 5c of the drainage pipe is brought close to the end plate 8 of the muffler body 1, the condensed water in the drainage pipe 5 can be warmed by the heat transmitted from the end plate 8, thereby Freezing of condensed water can be prevented.

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, the shape and material including the length and cross section of the drain pipe can be set as appropriate.

Further, one end of the drain pipe may be provided so as to penetrate upward from the bottom of the shell.
When the outlet pipe also serves as the tail pipe, the other end of the drain pipe may be connected to the outlet pipe.

  The structure of the muffler body is not limited to the original composed of the cylindrical shell and end plate, but the muffler body constructed by press-molding two flat plates and the pipe end by spinning method etc. The present invention can also be applied to a muffler body formed by reducing the diameter.

1 is an overall view showing a drainage structure of a vehicle muffler according to an embodiment of the present invention.

Explanation of symbols

R1, R2, R3 Silence chamber X1, X2, X3, X4, X5, X6, X7, X8 Welding 1 Muffler body 2 Inlet pipe 3 Outlet pipe 4 Tail pipe 4a Through hole 5 Drain pipe 5a One end 5b The other end 5c Part (in the middle) of the drain pipe 6 Shell 6a Bottom portion 7, 8 End plate 7a, 8a Flange portion 7b, 8b Burring portion 8c Through hole 9, 10 Baffle plate 9a, 10a Flange portion 9b, 10b Communication hole 9c, 9d, 10c, 10d burring part

Claims (2)

A muffler body having a muffler chamber;
An exhaust gas upstream pipe connected to the connection pipe on the engine side and for flowing exhaust gas into the muffler chamber;
Provided in a state protruding from the muffler body, and provided with an exhaust gas downstream pipe for exhausting the exhaust gas of the muffler chamber to the outside,
One end of the muffler main body is connected to the muffler chamber with one end abutting against or close to the bottom of the muffler main body, and the other end is connected to the protruding portion of the exhaust gas downstream pipe. A muffler drainage structure for a vehicle characterized by providing a drain pipe. The vehicle muffler drainage structure according to claim 1,
A muffler drainage structure for a vehicle, wherein at least a part of a midway part of the drain pipe is arranged in contact with or close to a part of a muffler main body.

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