JP2006112327A - Drain structure for vehicular muffler - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a water drain structure for a vehicular muffler efficiently draining condensation water generated in an inside of the vehicular muffler from an early stage during which condensation water is generated. <P>SOLUTION: An inlet pipe 1c for making exhaust gas flow in and an outlet pipe 1d for making exhaust gas flow out are provided in the vehicular muffler enclosed two end plates 3a, 3b and a shell 2. A hollow drain pipe 5 communicating to an inside of the outlet pipe 1d is projectingly provided toward a bottom part 2a of the shell 2 and wire 6 (equivalent to first wire member) abutting at least on the bottom part 2a of the shell 2 from a lower end part 5a of the drain pipe 5 is provided. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a drainage structure for a vehicle silencer, and more particularly to a drainage structure for a vehicle silencer that can discharge condensed water accumulated inside the vehicle silencer from the initial stage to the outside.

Conventionally, in a vehicle silencer, as shown in FIG. 9, the inside of the shell 02 is defined in a plurality of chambers by a plurality of inner plates 01a, 01b and two end plates 03a, 03b. An inlet pipe 01c and an outlet pipe 01d are provided in a penetrating state, and exhaust gas (illustrated by a one-dot chain line arrow) is discharged from the inlet pipe 01c through each chamber through the outlet pipe 01d.
Further, when water vapor in the exhaust gas condenses and the condensed water 07 accumulates at the bottom of the shell 02, rust is likely to be generated inside the vehicle silencer, which increases costs such as changing to an expensive material. Moreover, it becomes a cause of noise generation.
Accordingly, a technique is known in which a drain pipe 05 communicating with the outlet pipe 01d is provided toward the bottom of the shell 2 and the condensed water 07 is discharged together with the exhaust gas by using the intake pressure of the exhaust gas. (See Patent Document 1).
Japanese Utility Model Laid-Open No. 1-142513

However, in the conventional drainage structure for a vehicle silencer, if the height W (see FIG. 9) between the drain pipe and the bottom of the shell is set high, the condensed water always reaches the lower end of the drain pipe. There was a problem that it could not be removed completely because of accumulation.
On the other hand, if the height W is set low, there is a risk that the drain pipe will come into contact with the bottom of the shell due to vibration or the like when the vehicle travels, and noise may be generated, and the setting of the height W is very important. Therefore, there is a problem that high component accuracy and assembly accuracy are required.

  SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a vehicle silencer capable of efficiently discharging condensed water to the outside with a simple configuration from the initial stage where condensed water is generated. Is to provide a water draining structure.

  According to the first aspect of the present invention, an inlet pipe for allowing exhaust gas to flow in and an outlet pipe for discharging exhaust gas are provided in a vehicle silencer surrounded by two end plates and a shell. A hollow drainage pipe that communicates with the inside of the outlet pipe is projected toward the bottom of the shell, and a first linear member that contacts at least the bottom of the shell from the lower end of the drainage pipe is provided. It is characterized by that.

  According to a second aspect of the present invention, in the drainage structure for a vehicle silencer according to the first aspect, the interior of the vehicle silencer is defined by an inner plate into a plurality of chambers, The drain pipe and the first linear member are provided at the outlet pipe in the chamber where the condensed water of the exhaust gas is most likely to accumulate.

  According to a third aspect of the present invention, an inlet pipe for allowing exhaust gas to flow in and an outlet pipe for discharging exhaust gas are provided in a vehicle silencer surrounded by two end plates and a shell. A second linear member that contacts the bottom of the shell from the upstream end of the outlet pipe is provided.

  In the first aspect of the present invention, a hollow drainage pipe communicating with the inside of the outlet pipe is projected toward the bottom of the shell, and comes into contact with the bottom of the shell at least from the lower end of the drainage pipe. Since the first linear member is provided, the condensed water accumulated at the bottom of the shell can be transferred to the first linear member and guided from the lower end of the drain pipe into the outlet pipe. The durability of the vehicle silencer can be improved by completely removing condensed water from the initial stage where water is generated.

  Moreover, the component accuracy and assembly accuracy of the drain pipe are not required to be highly required, and condensed water can be removed with a simple configuration.

  According to the second aspect of the present invention, the interior of the vehicle silencer is defined by an inner plate in a plurality of chambers, and a portion of the outlet pipe in the chamber in which the condensed water of the exhaust gas is most likely to accumulate among the plurality of chambers Since the water drain pipe and the first linear member are provided, the condensate in the chamber in which the condensed water of the exhaust gas is most likely to accumulate is preferentially removed, so that adverse effects on other chambers can be suppressed.

  In the invention according to claim 3, since the second linear member that comes into contact with the bottom of the shell from the upstream end of the outlet pipe is provided, the condensed water collected at the bottom of the shell is It can be guided to the inside of the outlet pipe from the lower end of the drain pipe, thereby completely removing the condensate from the initial stage where the condensate is generated with a simple configuration. 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 an overall side sectional view showing a water drainage structure of a vehicle silencer according to a first embodiment of the present invention, FIG. 2 is an enlarged sectional view of a main part of FIG. 1, and FIG. 3 is a perspective sectional view taken along line S3-S3 of FIG. FIG.

First, the overall configuration will be described.
As shown in FIGS. 1 and 2, the vehicle silencer employing the vehicle silencer drain structure of the present embodiment is mainly composed of an intermediate assembly 1, a shell 2, and end plates 3 a and 3 b. It is said.

The intermediate assembly 1 includes two inner plates 1a and 1b, an inlet pipe 1c, and an outlet pipe 1d, and the silencer is partitioned into three chambers 1e, 1f, and 1g.
Further, the outer shape of the inner plates 1a and 1b is formed in a flat oval shape.
The inlet pipe 1c is assembled so as to penetrate the end plate 3a and the two inner plates 1a and 1b.
The outlet pipe 1d is assembled so as to penetrate the end plate 3b and the two inner plates 1a and 1b.
Note that communication holes 4a and 4b are formed in the inner plates 1a and 1b.

  The shell 2 is formed by winding a plurality of outer peripheries of the inner plates 1a and 1b and the end plates 3a and 3b.

2 and 3, a hollow drain pipe 5 communicating with the outlet pipe 1d from the outlet pipe 1d in the chamber 1g toward the bottom 2a of the shell 2 is projected, and the drain A wire 6 (corresponding to a first linear member) whose tip is in contact with the bottom 2 a of the shell 2 is provided in a bundle on the inner peripheral surface of the lower end 5 a of the tube 5.
The wire 6 is made of stainless steel and has excellent flexibility, and the base end side is welded or press-fitted and fixed (not shown) in a state of being bundled on the inner peripheral surface of the lower end portion 5a of the drain pipe 5. Yes.

Next, the operation will be described.
In the water draining structure of the vehicle silencer configured as described above, an exhaust gas upstream exhaust pipe (not shown) is connected to the inlet pipe 1c, and an exhaust gas downstream exhaust pipe (not shown) (not shown) is connected to the outlet pipe 1d. By connecting (not shown), the exhaust gas (shown by a one-dot chain arrow in FIG. 1) flowing into the inlet pipe 1c from the upstream exhaust pipe is first guided to the chamber 1g.
Next, the exhaust gas 1g in the chamber 1g is muffled by the expansion and contraction action while flowing in the order of the chamber 1f and the chamber 1e through the communication holes 4a and 4b of the inner plates 1a and 1b, and then the outlet pipe 1d. To the downstream exhaust pipe.

Here, if the condensed water in which the moisture in the exhaust gas is condensed continues to accumulate in the bottom 2a of the shell 2, rust is likely to be generated in the vehicle silencer or noise is generated.
However, in the water draining structure of the vehicle silencer of the first embodiment, as shown in FIG. 2, even if the water level W1 at the initial stage where the condensed water 7 is generated and accumulated is low, the water is condensed as shown by the broken arrow. The water 7 is transferred to the wire 6 by capillary action and flows into the outlet pipe 1d from the lower end 5a of the drain pipe 5 by the intake pressure of the exhaust gas (illustrated by a dashed line arrow) flowing in the outlet pipe 1d. The gas can be discharged together with the gas, thereby improving the durability of the vehicle silencer and preventing noise.

Further, even when the water level of the condensed water 7 reaches the position of the lower end 5a of the drain pipe 5, that is, the height W2 shown in FIG. 2, the condensed water 7 is passed through the drain pipe 5 by the intake pressure of the exhaust gas. Thus, the gas can be discharged into the outlet pipe 1d together with the exhaust gas.
In addition, since the wire 6 made of stainless steel and excellent in flexibility is used, the wire 6 is excellent in durability, and there is no possibility that noise is generated due to repeated contact between the tip of the wire 6 and the bottom 2a of the shell 2.

The drain pipe 5 and the wire 6 are provided in a chamber in which condensed water is most likely to accumulate among the three chambers.
Further, when the tip of the wire 6 is provided in a non-contact state with the bottom 2a of the shell 2, it is possible to prevent contact noise between the drain pipe and the bottom 2a to some extent as compared with the conventional invention, but the condensed water 7 Is not preferred because it cannot be completely removed from the initial stage.

Next, the effect will be described.
As described above, in the drainage structure of the vehicle silencer of the first embodiment, the exhaust gas is caused to flow into the vehicle silencer surrounded by the two end plates 3a and 3b and the shell 2. An inlet pipe 1c and an outlet pipe 1d for discharging exhaust gas are provided, and a hollow drain pipe 5 communicating with the inside of the outlet pipe 1d is projected toward the bottom 2a of the shell 2, and at least the drain pipe 5 Since the wire 6 that abuts the bottom 2a of the shell 2 from the lower end 5a of the shell 2 is provided, the condensed water 7 accumulated on the bottom 2a of the shell 2 is transmitted to the wire 6 and the outlet pipe from the lower end 5a of the drain pipe 5 1d can be guided to the outside and discharged to the outside, whereby the condensed water 7 can be completely removed from the initial stage where the condensed water 7 is generated, and the durability of the vehicle silencer can be improved.

  Moreover, the component accuracy and assembly accuracy of the drain pipe 5 are not highly required, and condensed water can be removed with a simple configuration.

Further, the interior of the vehicle silencer is defined by inner plates 1a, 1b into a plurality of chambers 1e, 1f, 1g, and among the plurality of chambers 1e, 1f, 1g, the condensate 7 of exhaust gas is most likely to accumulate. Since the drain pipe 5 and the wire 6 are provided in 1 g, adverse effects on the other chambers 1e and 1f can be suppressed by preferentially removing the condensed water in the chamber 1g.
When the distance between the outlet pipe 1d and the bottom 2a of the shell 2 is short, the drain pipe 5 is omitted, and the wire 6 is directly bundled with a metal ring, and the ring is passed through the outlet pipe 1d. It may be fixed with.

Example 2 will be described below.
The drainage structure of the vehicle silencer according to the present embodiment omits the drain pipe 5 and the wire 6 described in the first embodiment, and the second structure contacts the bottom of the shell from the upstream end of the outlet pipe. Since the same members as those of the first embodiment are provided except that the linear members are provided, the same constituent members are denoted by the same reference numerals, the description thereof is omitted, and only differences are described in detail.
4 is an overall side cross-sectional view showing the water drainage structure of the vehicle silencer according to the second embodiment of the present invention, FIG. 5 is an enlarged cross-sectional view of the main part of the second embodiment, and FIG. FIG. 7 is a perspective view of the ring of the second embodiment, and FIG. 8 is a perspective view of the ring to which the wire of the second embodiment is attached.

First, the overall configuration will be described.
As shown in FIGS. 4 to 6, in the vehicle silencer employing the vehicle silencer drain structure of the second embodiment, the ring 11 is provided on the inner peripheral surface of the upstream end 10 of the outlet pipe 1 d. A wire 12 (corresponding to a second linear member) whose tip is in contact with the bottom 2a of the shell 2 is fixed to the ring 11 by spot welding (not shown).
Specifically, as shown in FIGS. 7 and 8, a part of the ring 11 is formed with a ring part 13 cut and raised inward, and the base end of the wire 12 is formed in the ring part 13. It is welded or press-fitted (not shown) with the sides bundled.
The wire 12 is made of stainless steel and has excellent flexibility.

Next, the operation will be described.
In the water drainage structure of the dual-use silencer configured as described above, as shown in FIG. 4, the condensed water 7 accumulated in the bottom 2 a of the shell 2 is taken into the intake pressure of the exhaust gas (shown by a one-dot chain line arrow) and As shown by the broken line arrow due to capillary action, it can be transmitted to the wire 12 through the wire 12 and discharged to the outside together with the exhaust gas, thereby improving the durability of the vehicle silencer and preventing noise. .

  Moreover, since the tip of the wire 12 is in contact with the bottom 2a of the shell 2, the condensed water 7 can be completely removed.

Next, the effect will be described.
As described above, in the drainage structure of the vehicle silencer of the second embodiment, the exhaust gas is caused to flow into the vehicle silencer surrounded by the two end plates 3a and 3b and the shell 2. Since the inlet pipe 1c and the outlet pipe 1d for exhausting the exhaust gas are provided, and the wire 12 that comes into contact with the bottom 2a of the shell 2 from the upstream end 10 of the outlet pipe 1d is provided, the pipe 2 accumulates at the bottom 2a of the shell 2. The condensed water 7 is transmitted to the wire 12 and guided to the inside of the outlet pipe 1d to be discharged to the outside, and the condensed water 7 can be completely removed with a simple configuration to improve the durability of the vehicle silencer.

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 installation position, number, shape, material, outer diameter, number, arrangement, etc. other than radial of the drainage pipe and wires 6 and 12 can be appropriately set. For example, a mesh wire knitted with a thin wire may be used. good.

It is a whole sectional side view which shows the drain structure of the muffler for vehicles of Example 1 of this invention. FIG. 3 is an enlarged cross-sectional view of a main part of the first embodiment. It is a perspective sectional view in the S3-S3 line of FIG. It is a whole sectional side view which shows the water draining structure of the silencer for vehicles of Example 2 of this invention. It is a principal part expanded sectional view of the present Example 2. FIG. It is sectional drawing in the S6-S6 line | wire of FIG. It is a perspective view of the ring of the present Example 2. It is a perspective view of the ring with which the wire of the present Example 2 was mounted | worn. It is a whole sectional side view which shows the water draining structure of the conventional vehicle silencer.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Intermediate assembly 1a, 1b Inner plate 1c Inlet pipe 1d Outlet pipe 1e, 1f, 1g Chamber 2 Shell 2a Bottom part 3a, 3b End plate 4a, 4b Communication hole 5 Drain pipe 5a Lower end part 6, 12 Wire 7 Condensed water 10 Upstream end portion 11 Ring 13 Ring portion

Claims (3)

In the vehicle silencer surrounded by the two end plates and the shell, an inlet pipe for injecting exhaust gas and an outlet pipe for exhausting exhaust gas are provided.
A hollow water drain pipe communicating with the inside of the outlet pipe is projected toward the bottom of the shell,
A drainage structure for a vehicle silencer, comprising: a first linear member that abuts at least a bottom end of the shell from a lower end of the drainage pipe. The drainage structure for a vehicle silencer according to claim 1,
The vehicle silencer is defined in an inner plate in a plurality of chambers,
A drainage structure for a muffler for a vehicle, wherein a drain pipe and a first linear member are provided in a portion of an outlet pipe in a chamber in which exhaust gas condensate is most likely to accumulate. In the vehicle silencer surrounded by the two end plates and the shell, an inlet pipe for injecting exhaust gas and an outlet pipe for exhausting exhaust gas are provided.
A drainage structure for a vehicle silencer, comprising a second linear member that contacts the bottom of the shell from the upstream end of the outlet pipe.

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