JP2006342679A - Exhaust pipe fixing structure in vehicular muffler - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an exhaust pipe fixing structure in a vehicular muffler, for easily temporarily assembling, welding and fixing these, by regulating a position in the rotational direction of a tail pipe, by also abolishing regulation of the position in the rotational direction to a burring part of an outlet pipe. <P>SOLUTION: An upstream end part 20b of the burring part 20 is formed in an inclined shape along an external shape of an end plate 11, and an upstream side end part 4a of the tail pipe 4 is formed in an inclined shape adjusted to an end part 20b of the burring part 20. An upstream side end part 8b of the outlet pipe 8 is penetrated through an exhaust pipe through-hole 20a, and is arranged in a projected state outside the end part 20b of the burring part 20. The upstream side end part 4a of the tail pipe 4 is fitted around the downstream side end part 8b of the outlet pipe 8. Both the burring part 20 and both the pipes 8 and 4 are fixed by welding X3 in a butted and adjusted state to the end part 20b of the burring part 20. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an exhaust pipe fixing structure in a vehicle silencer.

  Conventionally, as an exhaust pipe fixing structure for fixing an end portion of an exhaust pipe while passing through a partition wall of a vehicle silencer, for example, as shown in FIG. 5A, an end plate 011 of a vehicle silencer is provided. An exhaust pipe through-hole 020a having a burring portion 020 is formed, and an end portion 020b of the burring portion 020 and an end portion 08b of the outlet pipe 08 are overlapped with each other, and FIG. ), The end of the tail pipe 04 having a reduced diameter is inserted inside the outlet pipe 08, and the burring part 020 and both pipes 08 and 04 are generally fixed together by welding X01 (patent) References 1 and 2).

Further, in recent years, the end plate 011 is formed in a substantially bowl shape so as to bulge outward in order to enlarge the sound deadening chamber, and accordingly, the end portion 020b of the burring portion 020 and the end portion 08b of the outlet pipe 08 are arranged at the end. It is formed in an inclined shape along the outer shape of the plate 011 (see Patent Document 3).
JP 2002-89230 A JP-A-10-89059 JP 2003-138935 A

  However, in the conventional exhaust pipe fixing structure in a vehicle silencer, it is necessary to form the end of the outlet pipe in an inclined shape in accordance with the end of the burring part. There is a problem that the position of the direction is restricted, and it takes much time to assemble and weld the two.

  In addition, since the end of the tail pipe is reduced in diameter, it is inserted and fixed inside the outlet pipe, so the exhaust gas does not flow smoothly near the end of the tail pipe, and the pressure loss of the exhaust gas increases, There is a possibility that airflow noise is generated due to the turbulence of the exhaust gas.

  Note that it is conceivable to avoid the restriction of the rotational position of the outlet pipe with respect to the burring portion described above by forming the protruding height outside the burring portion in advance and cutting the end portion in the vertical direction. However, in this case, the end of the burring part becomes extremely thin during burring, and the rigidity required for welding cannot be obtained, and additional cutting steps and extra materials are required, resulting in high costs. It is not preferable.

The present invention has been made to solve the above-described problems, and the object of the present invention is to eliminate the restriction of the rotational position of the outlet pipe with respect to the burring portion, and at the same time, restrict the rotational position of the tail pipe. It is another object of the present invention to provide an exhaust pipe fixing structure in a vehicle silencer that can easily perform temporary assembly and welding fixation.
Another object of the present invention is to provide an exhaust pipe fixing structure in a vehicle silencer that can prevent an increase in exhaust gas pressure loss and airflow noise.

  In the first aspect of the present invention, the end plate of the vehicle silencer is formed in a substantially bowl shape so as to bulge outward, and an exhaust pipe through hole provided with a burring portion is formed in the end plate, In an exhaust pipe fixing structure in a vehicle silencer in which the outlet pipe and the tail pipe are communicated with each other through the exhaust pipe through-hole and the burring part and both pipes are welded together, an end portion of the burring part Is formed in an inclined shape along the outer shape of the end plate, the connection side end portion of the tail pipe is formed in an inclined shape matching the end portion of the burring portion, and the connection side end portion of the outlet pipe is formed in the exhaust pipe through hole. And is arranged so as to protrude outward from the end portion of the burring portion, and the connection side end portion of the tail pipe is externally fitted to the connection side end portion of the outlet pipe, and As it abutted made to match the end of the burring portion, characterized by being welded together fix the burring portion and the pipes.

  In the first aspect of the invention, the end plate of the vehicle silencer is formed in a substantially bowl shape so as to bulge outward, and an exhaust pipe through hole provided with a burring portion is formed in the end plate, In an exhaust pipe fixing structure in a vehicle silencer in which the outlet pipe and the tail pipe are communicated with each other through the exhaust pipe through-hole and the burring part and both pipes are welded together, an end portion of the burring part Is formed in an inclined shape along the outer shape of the end plate, the connection side end portion of the tail pipe is formed in an inclined shape matching the end portion of the burring portion, and the connection side end portion of the outlet pipe is formed in the exhaust pipe through hole. Is arranged in a state of projecting outward from the end of the burring portion, and the connection side end of the tail pipe is externally fitted to the connection side end of the outlet pipe, and Since the burring part and both pipes are welded and fixed together so as to match the end part of the burring part, restriction on the rotational direction position of the outlet pipe relative to the burring part can be abolished, and at the same time the rotational direction position of the tail pipe can be set. These provisional assembly and welding fixation can be easily performed by regulating.

  Also, because the tail pipe end is fitted to the outlet pipe end, the exhaust gas can flow smoothly from the outlet pipe to the tail pipe, preventing an increase in exhaust gas pressure loss and airflow noise. .

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

  FIG. 1 is a longitudinal sectional view showing a vehicle silencer employing an exhaust pipe fixing structure in a vehicle silencer according to a first embodiment of the present invention. FIG. 2 is an enlarged view of a main part of the vehicle silencer according to the first embodiment. FIG. 3 is a cross-sectional view, FIG. 3 is a diagram for explaining the assembly of the vehicle silencer of the first embodiment, and FIG. 4 is a diagram for explaining the assembly of the outlet pipe and the tail pipe of the first embodiment.

First, the overall configuration will be described.
As shown in FIGS. 1 and 2, the vehicle silencer adopting the exhaust pipe fixing structure in the vehicle silencer of the first embodiment includes a shell 1, an intermediate assembly 2, a front pipe 3, and a tail pipe. 4 is provided.

  The shell 1 is wound around the outer peripheries of the plate-like inner plates 6 and 7 and the end plates 10 and 11, and the winding direction end portions are welded and fixed in the longitudinal direction of the vehicle silencer. Is fixed by welding X1 and X2 over the entire circumference of the end plates 10 and 11.

The intermediate assembly 2 includes inner plates 6 and 7, an outlet pipe 8, and an inlet pipe 9, whereby the silencer surrounded by the shell 1, end plates 10 and 11, and inner plates 6 and 7 described above. The interior is divided into three chambers 12, 13, and 14.
The inner plates 6 and 7 are formed with exhaust gas circulation holes O1 and O2 that allow the exhaust gas to flow between adjacent chambers.

  The outlet pipe 8 is disposed in a state of penetrating the inner plates 6 and 7, and its upstream end 8a is communicated with the chamber 12, while the downstream end 8b (corresponding to the connection end of the outlet pipe). Is connected to the tail pipe 4 through the end plate 11.

As shown in FIG. 2, the end plate 11 is formed in a substantially bowl shape that swells outward, and an exhaust pipe through hole 20 a including a burring portion 20 is formed, and an end portion 20 b of the burring portion 20 is When the peripheral edge of the exhaust pipe through hole 20a is subjected to burring, it is formed in an inclined shape along the outer shape of the end plate 11.
Further, the downstream end portion 8b of the outlet pipe 8 is formed to be flat in the vertical direction and penetrates the exhaust pipe through hole 20a of the burring portion 20 and protrudes outward from the end portion 20b of the burring portion 20. Has been placed.

Further, the upstream end 4a of the tail pipe 4 (corresponding to the connection end of the tail pipe) is formed in an inclined shape that matches the end 20b of the burring portion 20, and the downstream end of the outlet pipe 8. The outer pipe 8b is fixed to the outlet pipe 8 and the burring portion 20 by welding X3 over the entire circumference in a state where the outer pipe 8b is fitted to the end portion 20b of the burring portion 20.
The tail pipe 4 of the first embodiment is formed in a shape that is bent downward toward the downstream end 4b of the tail pipe 4 in the middle thereof, but this is not restrictive.

  On the other hand, the inlet pipe 9 is disposed in a state of penetrating the inner plates 6 and 7, and its downstream end 9 a is communicated with the chamber 14, while the upstream end 9 b is the downstream end of the outlet pipe 8. Similarly to the portion 8b, the end plate 10 is connected to the front pipe 3 through the end plate 10.

  Specifically, the exhaust pipe through hole 30a including the burring portion 30 is formed in the end plate 10 similarly to the end plate 11, and passes through the exhaust pipe through hole 30a from the end 30b of the burring portion 30. An upstream end portion 9b of the inlet pipe 9 is arranged in a state of protruding outward.

  Further, the end 30b of the burring portion 30 is fixed to the inlet pipe 9 by welding X4 over the entire circumference.

  Further, the downstream end portion of the front pipe 3 is fixed by welding X5 over the entire circumference in a state where the upstream end portion 9b of the inlet pipe 9 is externally fitted.

Next, the operation will be described.
When manufacturing the vehicle silencer configured as described above, first, as shown in FIG. 3 (a), the intermediate assembly 2 is assembled and the respective parts are welded and fixed, and then, as shown in FIG. 3 (b). As shown, the shell 1 is wound around the outer periphery of the inner plates 6 and 7.

  Next, as shown in FIG. 3C, the end plate 10 is press-fitted into the upstream end portion (left side in the drawing) of the shell 1, and the upstream end portion 9 b of the inlet pipe 9 is connected to the exhaust pipe of the end plate 10. It penetrates through the through hole 30a and is made to protrude outward from the end 30b of the burring portion 30, and both are fixed by welding X4.

  Subsequently, as shown in FIG. 3C, the end plate 11 is press-fitted into the downstream end portion (right side in the drawing) of the shell 1, and the downstream end portion 8 b of the outlet pipe 8 is connected to the exhaust pipe of the end plate 11. It is set as the state penetrated to the through-hole 11a and protruded outside from the edge part 20b of the burring part 20 (refer Fig.4 (a)).

  Next, as shown in FIGS. 4A and 4B, the upstream end 4 a of the tail pipe 4 is externally fitted to the downstream end 8 b of the outlet pipe 8, and the burring portion 20 These three members are fixed by welding X3 as a state of matching with the end 20b (see FIG. 2).

At this time, as long as the outlet pipe 8 protrudes outward from the end 20b of the burring portion 20, good welding X3 can be performed regardless of the position in the rotational direction with respect to the burring portion 20.
Accordingly, there is no need to regulate the rotational direction position of the outlet pipe 8 with respect to the burring portion 20, and a jig or the like is used so that the outlet pipe 8 does not rotate during temporary assembly of the temporary composition shaped product 2 or during welding X3. There is no need to fix it.

  Further, since the upstream side end portion 4a of the tail pipe 4 is formed in an inclined shape that matches the end portion 20b of the burring portion 20, the position in the rotational direction of the tail pipe 4 where the rotational direction position is essential can be regulated, Thereby, there is no possibility that the tail pipe 4 is attached to the burring portion 20 at a wrong rotational direction position.

  Here, in the conventional invention, the end of the outlet pipe and the end of the burring portion are formed in an inclined shape in accordance with the end of the burring portion in order to weld and fix the end portions of the outlet pipe and the burring portion in a uniform manner. Therefore, it is necessary to regulate the position of the outlet pipe in the rotational direction with respect to the burring portion, and there is a problem in that it takes much time when the temporary assembly 2 is temporarily assembled or when welding X3.

  Note that it is possible to avoid the restriction of the rotational position of the outlet pipe with respect to the burring portion described above by forming the protruding height to the outside of the burring portion 20 in advance and cutting the end portion in the vertical direction. In this case, however, the end of the burring portion becomes extremely thin and the rigidity required for welding cannot be obtained, and an additional cutting process and extra materials are required, resulting in high costs.

  On the other hand, in the first embodiment, as described above, the restriction on the rotational direction position of the outlet pipe 8 with respect to the burring portion 20 can be abolished, and at the same time, the rotational position of the tail pipe 4 is restricted, and these temporary assemblies. And welding fixing can be performed easily and appropriately.

  Finally, the end of the shell 1 in the winding direction is welded and fixed in the longitudinal direction of the vehicle silencer, and both peripheral edges of the shell are fixed to the end plates 10 and 11 by welding X1 and X2 over the entire circumference. To do.

  In the vehicle silencer configured as described above, the inlet pipe 9 is fixed to the front pipe 3 by welding X5, and the exhaust gas flowing in through the front pipe 3 (shown by the broken arrow in FIG. 1) Into the chamber 13 through the exhaust gas flow hole O2, and after being silenced by expansion and contraction while flowing into the chamber 12 through the exhaust gas flow hole O1, the outlet pipe 8, the tail It passes through the pipe 4 in this order and is discharged to the outside.

  Here, in the conventional invention, since the upstream end portion of the reduced tail pipe is fixed in a state of being inserted inside the outlet pipe, the exhaust gas smoothly flows in the vicinity of the end portion of the tail pipe. There is a possibility that the pressure loss of the exhaust gas may increase or the flow noise may be generated.

  On the other hand, in the first embodiment, as described above, the upstream end 4a of the tail pipe 4 is externally fitted to the downstream end 8b of the outlet pipe 8, so that the exhaust gas can flow smoothly. , Pressure loss can be increased and airflow noise can be prevented.

  Further, compared to the conventional invention, the upstream end 4a of the tail pipe 4 is brought into contact with the end 20b of the burring portion 20, so that the appearance of the joint portion between them can be improved.

Next, the operation will be described.
As described above, in the exhaust pipe fixing structure in the vehicle silencer according to the present embodiment, the end plate 11 of the vehicle silencer is formed in a substantially bowl shape so as to bulge outwardly. An exhaust pipe through-hole 20a having a burring portion 20 is formed, and the outlet pipe 8 and the tail pipe 4 are communicated with each other through the exhaust pipe through-hole 20a. In the exhaust pipe fixing structure in the vehicle silencer to which both are welded X3, the upstream end 20b of the burring portion 20 is formed in an inclined shape along the outer shape of the end plate 11, and the upstream end of the tail pipe 4 is formed. The portion 4a is formed in an inclined shape that matches the end portion 20b of the burring portion 20, and the upstream end portion 8b of the outlet pipe 8 is passed through the exhaust pipe through hole 20a so that the burring portion The upstream end 4a of the tail pipe 4 is externally fitted to the downstream end 8b of the outlet pipe 8, and the end 20b of the burring portion 20 is disposed so as to protrude outward from the zero end 20b. Since the burring portion 20 and the pipes 8 and 4 are both fixed by welding X3, the restriction of the rotational position of the outlet pipe 8 with respect to the burring portion 20 can be abolished, and at the same time the tail pipe 4 is rotated. The temporary position and welding fixation can be easily performed by regulating the direction position.

  Further, since the upstream end 4a of the tail pipe 4 is fitted on the upstream end 8b of the outlet pipe 8, the exhaust gas can flow smoothly from the outlet pipe 8 to the tail pipe 4, and the pressure loss of the exhaust gas. Can be prevented and the generation of airflow noise.

  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 specific internal structure of the vehicle silencer and the flow of exhaust gas associated therewith can be set as appropriate.

  When the front pipe 3 is provided with a curved portion and the rotation direction position needs to be regulated, the front pipe 3 may be fixed similarly to the tail pipe 4.

BRIEF DESCRIPTION OF THE DRAWINGS It is a longitudinal cross-sectional view which shows the silencer for vehicles by which the fixing structure of the exhaust pipe in the silencer for vehicles of Example 1 of this invention was employ | adopted. It is a principal part expanded sectional view in the silencer for vehicles of the present Example 1. It is a figure explaining the assembly | attachment of the silencer for vehicles of the present Example 1. FIG. It is a figure explaining the assembly | attachment of the outlet pipe of this Example 1, and a tail pipe. It is a figure explaining the assembly | attachment of the conventional vehicle silencer.

Explanation of symbols

Vehicle silencer O1, O2 Exhaust gas flow holes X1, X2, X3, X4, X5 Welding 1 Shell 2 Intermediate assembly 3 Front pipe 4 Tail pipe 4a (Tail pipe) upstream end 4b (Tail pipe) downstream Ends 6 and 7 Inner plate 8 Outlet pipe 8a (outlet pipe) upstream end 8b (outlet pipe) downstream end 9 Inlet pipe 9a (inlet pipe) downstream end 9b (inlet pipe) upstream Side ends 10, 11 End plates 12, 13, 14 Chambers 20, 30 Burring portions 20a, 30a Exhaust pipe through holes 20b, 30b (of the burring portion)

Claims (1)

The end plate of the vehicle silencer is formed in a substantially bowl shape so as to swell outward,
An exhaust pipe through-hole having a burring portion is formed in the end plate, and the burring portion and both pipes are welded and fixed together with the outlet pipe and the tail pipe communicating with each other through the exhaust pipe through-hole. In the exhaust pipe fixing structure in a vehicle silencer,
An end of the burring part is formed in an inclined shape along the outer shape of the end plate,
The tail end of the tail pipe is formed in an inclined shape that matches the end of the burring portion,
The outlet side connecting end of the outlet pipe penetrates through the exhaust pipe through hole and is arranged in a state protruding outward from the end of the burring part,
The burring part and both pipes are welded and fixed together with the connection side end of the tail pipe fitted to the connection side end of the outlet pipe and matched to the end of the burring part. An exhaust pipe fixing structure in a vehicle silencer characterized by the above.

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