JP2008115798A - Drain structure for vehicular muffler - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a drain structure for a vehicular muffler, which excellently drains water collected on a bottom part of a shell of a muffler body regardless of the operating condition of an engine. <P>SOLUTION: An outlet pipe 3 is disposed to penetrate downwardly from a bottom part 4b of a shell of a muffler body 1, water drain holes 3a are provided near the bottom part 4b of the shell in the outer periphery of the outlet pipe 3 inside the muffler body 1, and the water collected at the bottom part 4b of the shell 4 is made to flow into the outlet pipe 3 from the water drain holes 3a for draining to the outside. <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 of the muffler body toward the bottom of the shell, the water (condensed water) collected at the bottom of the shell using the intake pressure of the exhaust gas flowing through the outlet pipe is drained. The technology of the drainage structure of a vehicle muffler that flows into the outlet pipe from the outlet and discharges to the outside is known (see Patent Documents 1 and 2).
JP 2006-112327 A JP 2004-285916 A

However, the conventional invention has a problem that it does not function at all because the intake pressure of the exhaust gas cannot be obtained when the engine is stopped.
In addition, since the condensed water is water condensed in the exhaust gas after the engine is stopped, the condensed water is accumulated until the next engine start.

  The present invention has been made in order to solve the above-described problems, and an object of the present invention is to provide a vehicle muffler that can well discharge water accumulated at the bottom of the shell of the muffler body regardless of the operating condition of the engine. Is to provide a drainage structure.

  In the first aspect of the present invention, the muffler body is disposed in a state where the outlet pipe penetrates downward from the bottom of the shell of the muffler body, and the drain hole is provided inside the muffler body near the bottom of the shell on the outer periphery of the outlet pipe. And water collected at the bottom of the shell is allowed to flow into the outlet pipe from the drain hole and discharged to the outside.

  In the first aspect of the present invention, the muffler main body is disposed in a state of penetrating the outlet pipe downward from the bottom of the shell of the muffler main body, and is disposed inside the muffler main body near the bottom of the shell on the outer periphery of the outlet pipe. Water drainage holes are provided, and the water accumulated at the bottom of the shell flows into the outlet pipe through the drainage holes and is discharged to the outside. Therefore, the water collected at the bottom of the shell of the muffler body regardless of the operating condition of the engine Can be discharged well.

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

Example 1 will be described below.
FIG. 1 is a diagram illustrating a drainage structure of a vehicle muffler according to a first embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along line S2-S2 of FIG.

First, the overall configuration will be described.
As shown in FIG. 1, the muffler drainage structure for a vehicle according to the first embodiment includes a muffler body 1, an inlet pipe 2, and an outlet pipe 3.

  The muffler main body 1 includes a shell 4 formed in a substantially flat tubular shape, end plates 5 and 6 for closing openings at both ends of the shell 4, baffle plates 7 and 8 serving as partition members and reinforcing members in the shell 4, Accordingly, the inside of the muffler body 1 is partitioned into three sound deadening chambers R1 to R3 by baffle plates 7 and 8.

The end plates 5 and 6 are formed in a substantially dish-like shape that swells to the outside of the muffler main body 1, so that the capacity of the corresponding silencer chambers R1 and R3 is larger than that in the case of being formed in a flat plate shape. .
The outer peripheral edge portions of the end plates 5 and 6 are fixed to the end portions of the corresponding shells 4 by welding X1 over the entire circumference.

  The baffle plates 7 and 8 are connected to the shell 4 at a plurality of locations on the outer peripheral edge by spot welding (not shown), and in the middle of the baffle plates 7 and 8, the adjacent silencer chambers R1 to R3 communicate with each other. Holes 7a and 8a are provided, and a communication hole (not shown) is provided at the bottom of the adjacent silencer chambers R1 to R3.

The inlet pipe 2 is provided in a state where one end of the inlet pipe extends through the side of the shell 4 and protrudes to the outside, and the other end communicates with the sound deadening chamber R1 in a state of passing through the baffle plates 7 and 8. Is provided.
Specifically, one end portion of the inlet pipe 2 is formed in a side portion of the shell 4 and a reinforcing and gap closing member 9 described later is passed through a through hole 4 a larger than the outer diameter of the inlet pipe 2. Is inserted through.

The reinforcing and gap closing member 9 serves to close the gap between the inlet pipe 2 and the through hole 4a and to connect and fix between the shell 4 and the inlet pipe 2 and is a cross section along the outer surface of the shell 4 An arc-shaped flange portion 9a and a cylindrical portion 9b projecting outward in a cylindrical shape continuously to the flange portion 9a and in close contact with the inlet pipe 2 are formed.
Further, the outer peripheral edge portion of the flange portion 9a of the reinforcing and gap closing member 9 is fixed to the shell 4 by welding X2, and the cylindrical portion 9b is fixed to the outer peripheral surface of the inlet pipe 2 by welding X3 over the entire circumference. ing.

The outlet pipe 3 is provided in a state in which one end thereof penetrates the bottom 4a of the shell 4 and protrudes to the outside, and the other end communicates with the sound deadening chamber R3 in a state of penetrating the baffle plates 7 and 8. Is provided.
Specifically, as shown in FIG. 2, one end portion of the outlet pipe 3 is formed in the bottom portion 4b of the shell 4 and will be described later in a state of passing through a through hole 4c larger than the outer diameter of the outlet pipe 3. It is inserted through the reinforcing and gap closing member 10.

The reinforcing and gap closing member 10 serves to close and fix the gap between the outlet pipe 3 and the through hole 4 c and to connect and fix the shell 4 and the outlet pipe 3, and is a cross section along the outer surface of the shell 4. An arc-shaped flange portion 10a and a cylindrical portion 10b projecting outward in a cylindrical shape continuously to the flange portion 9a and in close contact with the outlet pipe 3 are formed.
Further, one end portion of the tail tube 11 is provided at one end portion of the outlet pipe 3.
Further, the outer peripheral edge portion of the flange portion 10 a of the reinforcing and gap closing member 10 is fixed to the shell 4 by welding X 4, and the cylindrical portion 10 b is entirely connected to one end portion of the outlet pipe 3 and the outer peripheral surface of the tail tube 11. It is fixed by welding X5 over the circumference.

  Further, one end of a curled muffler cutter 12 is fixed to the other end of the tail tube 11 by welding X6 over the entire circumference. The muffler cutter 12 is not necessarily provided.

  A plurality of drain holes 3 a are provided inside the muffler body 1 near the bottom 4 b of the shell 4 on the outer periphery of the outlet pipe 3, and the lower drain holes 3 b are spaces formed inside the reinforcing and gap closing member 10. By being formed in a state facing O, the shell 4 is formed at a position lower than the bottom 4 b of the shell 4.

  In addition, the muffler main body 1 is mounted on the vehicle in a state where the muffler body 1 is slightly inclined so that the sound deadening room R1 side is lowered.

Next, the operation will be described.
In the vehicle muffler configured as described above, as shown in FIG. 1, the exhaust gas of the engine (shown by a one-dot chain line in the figure) flows from the inlet pipe 2 into the noise reduction chamber R1, thereby silencing due to expansion action. An effect 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 7a, 7a of the baffle plates 7, 8, thereby obtaining a noise reduction effect due to expansion and contraction. It is done.

  Further, the exhaust gas flowing into the sound deadening chamber R3 is exhausted to the outside of the muffler body 1 through the outlet pipe 3, the tail tube 11, and the muffler cutter 12.

  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 4, end plates 5, 6, baffle plates 7, 8, etc. by its own weight, and thus each silencing chamber R 1 , R2 and R3 move to the bottom 4b of the shell 4 and the condensed water moved to the bottom 4b of the shell 4 of the muffler chamber R2 and R3 passes through the communication holes at the bottom of the baffle plates 7 and 8, respectively. It moves to the bottom part 4b of the shell 4.

  Then, as shown in FIG. 2, the condensed water (shown by broken line arrows) that has moved to the bottom 4b of the shell 4 of the noise reduction chamber R1 is externally passed through each drain hole 3a through the outlet pipe 3, the tail tube 11, and the muffler cutter 12. Thus, it is possible to completely prevent the condensed water from accumulating at the bottom 4b of the shell 4.

  Further, a part of the condensed water is allowed to flow into the space O through the through hole 4 c of the shell 4, and the efficiency from the drain hole 3 b formed at a position lower than the bottom portion 4 b of the shell 4 to the outside through the outlet pipe 3. Can discharge well.

  Furthermore, even when rainwater or the like enters the muffler main body 1 through the muffler cutter 12, the tail tube 11, and the outlet pipe 3 when the vehicle is flooded, it can be smoothly discharged to the outside through the drain hole 3a.

Next, the effect will be described.
As described above, in the drainage structure for a vehicle muffler according to the first embodiment, the outlet pipe 3 is disposed so as to penetrate the outlet pipe 3 downward from the bottom 4b of the shell of the muffler main body 1. The drain hole 3a is provided inside the muffler body 1 in the vicinity of the shell bottom 4b on the outer periphery of the shell so that the water accumulated in the bottom 4b of the shell 4 flows into the outlet pipe 3 from the drain hole 3a and is discharged to the outside. Regardless of the operation status, the water accumulated in the bottom 4b of the shell of the muffler body 1 can be discharged well.

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, welding suitable for a part such as plasma welding, laser welding, seam welding, TIG welding, spot welding, or the like can be applied as the type of welding used for fixing each constituent member of the muffler body.

Moreover, the layout in the muffler main body 1 is arbitrary.
Furthermore, the inlet pipe 2 is not necessarily provided in a state of protruding from the shell 4, and may be provided in a state of protruding from the end plate 5 (6).

It is a figure which shows the drainage structure of the muffler for vehicles of Example 1 of this invention. It is sectional drawing in the S2-S2 line | wire of FIG. 1, and is a figure explaining an effect | action.

Explanation of symbols

O space R1, R2, R3 silencer chamber X1, X2, X3, X4, X5, X6 Welding 1 Muffler body 2 Inlet pipe 3 Outlet pipe 3a Drainage hole 3b Lower drainage hole 4 Shell 4a, 4c Through hole 4b Bottom 5,5 End plate 7, 8 Baffle plate 7a, 8a Communication hole 9, 10 Reinforcing and gap closing member 9a, 10a Flange portion 9b, 10b Cylindrical portion 11 Tail tube 12 Muffler cutter

Claims (1)

Arranged with the outlet pipe penetrating downward from the bottom of the shell of the muffler body,
A drainage hole is provided on the inner side of the muffler body near the bottom of the shell on the outer periphery of the outlet pipe,
A drainage structure for a vehicle muffler, characterized in that water accumulated at the bottom of the shell flows into the outlet pipe from the drain hole and is discharged to the outside.

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