JP4432727B2 - Muffler structure for vehicles - Google Patents

Description

  The present invention relates to a vehicle muffler structure attached to a vehicle such as an automobile.

2. Description of the Related Art Conventionally, a vehicle muffler structure attached to a vehicle such as an automobile has a partition plate or the like that has an exhaust inlet and an exhaust port at one end and includes a flat wall portion at the other end. A cylindrical first muffler body is connected to a cylindrical second muffler body having a plurality of sound deadening chambers (expansion chambers) from an exhaust introduction port at one end to an exhaust discharge port at the other end. A known muffler is known (see, for example, Patent Document 1).
JP2003-161148

  However, in the vehicle muffler structure of Patent Document 1, the first muffler body (lower muffler) is attached below the second muffler body (upper muffler) fixed to the vehicle body. For this reason, an external attachment part for attaching the first muffler body to the second muffler body is required, and the number of parts increases.

  In view of the above facts, an object of the present invention is to provide a vehicle muffler structure in which a lower muffler can be attached to an upper muffler without any external parts for attachment.

The present invention according to claim 1 is an upper muffler provided on the upper side in the vertical direction;
A lower muffler disposed on a vertically lower side of the upper muffler;
A connecting means for connecting the upper wall of the upper muffler in the vertical direction on the upper side and the lower wall of the lower side in the vertical direction inside the upper muffler, and supporting the load of the lower muffler;
Have a, the connecting means passes through the lower wall of the upper muffler, and forming an outer wall of the lower muffler.

In the upper muffler provided on the upper side in the vertical direction, a connecting means for connecting the upper wall on the upper side in the vertical direction and the lower wall on the lower side in the vertical direction passes through the lower wall of the upper muffler, By forming the outer wall, the lower muffler is supported by the lower wall of the upper muffler, and the lower muffler is also supported by the upper wall of the upper muffler via the connection wall.

The present invention according to claim 2 includes an upper muffler provided on the upper side in the vertical direction;
A lower muffler disposed on a vertically lower side of the upper muffler;
A connecting means for connecting the upper wall of the upper muffler in the vertical direction on the upper side and the lower wall of the lower side in the vertical direction inside the upper muffler, and supporting the load of the lower muffler;
The connecting means includes a connecting wall in the upper muffler and an outer wall of the lower muffler coupled to the connecting wall with the lower wall of the upper muffler interposed therebetween.

Inside the upper muffler provided on the upper side in the vertical direction , the outer wall of the lower muffler with the lower wall on the upper muffler sandwiched between the upper wall on the upper side in the vertical direction and the lower wall on the lower side in the vertical direction , The lower muffler is supported by the lower wall of the upper muffler, and the lower muffler is also supported by the upper wall of the upper muffler via the connecting wall.

According to a third aspect of the invention, in the vehicle muffler structure according to claim 2, wherein the connecting wall partition within the upper muffler, characterized in that it is a separator to form a silencer chamber.

In addition to the contents of the second aspect , the lower muffler is supported by the lower wall of the upper muffler, and the lower muffler is also supported by the upper wall of the upper muffler via the separator.

According to a fourth aspect of the present invention, there is provided the muffler structure for a vehicle according to the third aspect , wherein the muffler chamber of the upper muffler partitioned by the separator and the muffler chamber of the lower muffler are not partitioned by the separator. A chamber is formed.

In addition to the content of claim 3 , the silencing chamber of the upper muffler and the silencing chamber of the lower muffler partitioned by the separator form one silencing chamber that is not partitioned by the separator, and the capacity of the silencing chamber is increased. .

According to a fifth aspect of the present invention, in the vehicle muffler structure according to any one of the second to fourth aspects, a lateral wall that partitions the lower muffler into upper and lower silencing chambers, and the lateral wall and the connecting wall are connected. Load transmitting means for performing

In addition to the content described in any one of claims 2 to 4 , the load of the lower muffler is reduced by load transmitting means for connecting the horizontal wall that divides the lower muffler into upper and lower silencing chambers and the connecting wall in the upper muffler. It is transmitted to the upper muffler.

According to a sixth aspect of the present invention, there is provided the vehicle muffler structure according to the fifth aspect , wherein the load transmission means communicates the noise reduction chamber of the upper muffler and the noise reduction chamber below the lateral wall of the lower muffler. It is a pipe.

In addition to the content of the fifth aspect , the load of the lower muffler is transmitted to the upper muffler by the exhaust pipe that connects the muffler chamber of the upper muffler and the muffler chamber below the lateral wall of the lower muffler.
The present invention according to claim 7 is an upper muffler provided on the upper side in the vertical direction, a lower muffler disposed on the lower side in the vertical direction of the upper muffler, and an upper side in the vertical direction of the upper muffler inside the upper muffler. And connecting means for supporting the load of the lower muffler, and the upper muffler comprises an upper shell constituting the upper part of the upper muffler, A lower shell that constitutes a lower portion of the upper muffler and has a through hole formed therein,
The lower muffler has an upper opening that communicates with the through hole, and is formed on the upper edge of the wall portion on the outer periphery of the side portion toward the outside of the opening, and is welded to the lower surface of the lower wall of the lower shell. With a flange that
Inside the upper muffler, a separator having an upper end flange welded to the lower surface of the upper wall of the upper shell and a lower end flange welded to the upper surface of the lower wall of the lower shell is attached. It is characterized by.
A separator that connects the lower surface of the upper wall of the upper shell that forms the upper part of the upper muffler and the upper surface of the lower wall of the lower shell that forms the lower part of the upper muffler inside the upper muffler provided on the upper side in the vertical direction It supports the load of the lower muffler arranged on the lower side in the vertical direction of the muffler.

The vehicle muffler structure according to the first aspect of the present invention is configured as described above, so that the lower muffler can be attached to the upper muffler without any external parts for attachment.

The vehicle muffler structure according to the second aspect of the present invention is configured as described above, so that the lower muffler can be attached to the upper muffler without any external parts for attachment.

According to a third aspect of the invention in the vehicle muffler structure according to claim 2, since the connecting wall partition the inside of the upper muffler, a separator to form a silencing chamber, in addition to the effects according to claim 2, The number of parts can be reduced.

According to a fourth aspect of the present invention, there is provided a muffler structure for a vehicle according to the third aspect , wherein the muffler chamber of the upper muffler and the muffler chamber of the lower muffler partitioned by the separator form one silencer chamber that is not partitioned by the separator. Therefore, in addition to the effect of the third aspect , the capacity of the muffler chamber can be increased.

According to a fifth aspect of the present invention, in the vehicle muffler structure according to any one of the second to fourth aspects, a load is transmitted between the lateral wall that partitions the lower muffler into upper and lower silencing chambers, and the lateral wall and the coupling wall. Therefore , in addition to the effect of any one of Claims 2-4 , the support rigidity of a lower muffler improves.

According to a sixth aspect of the present invention, in the muffler structure for a vehicle according to the fifth aspect , the load transmission means is an exhaust pipe that communicates the muffler chamber of the upper muffler and the muffler chamber below the lateral wall of the lower muffler. In addition to the effect described in claim 5 , the number of parts can be reduced.
The present invention according to claim 7 is an upper muffler provided on the upper side in the vertical direction, a lower muffler disposed on the lower side in the vertical direction of the upper muffler, and an upper wall on the upper side in the vertical direction of the upper muffler inside the upper muffler. And a connecting means for supporting the load of the lower muffler, and the upper muffler constitutes an upper shell constituting the upper part of the upper muffler and a lower part of the upper muffler A lower shell having a through-hole formed therein, and the lower muffler having an upper opening that communicates with the through-hole and is formed at the upper edge of the wall portion on the outer periphery of the side portion toward the outside of the opening. A flange welded to the lower surface of the lower wall of the lower shell. Inside the upper muffler, the upper end flange is welded to the lower surface of the upper shell upper wall, and the lower end flange is the lower shell lower wall. The separator is welded to the top surface of Since is attached, without external components for mounting, it can be attached to the lower muffler on the muffler.

  An embodiment of a vehicle muffler structure according to the present invention will be described with reference to FIGS.

  In the figure, the arrow FR indicates the vehicle body front direction, and the arrow UP indicates the vehicle body upward direction.

  As shown in FIG. 2, the vehicle muffler 10 of the present embodiment has a large capacity and corresponds to a high output engine with a large displacement. The muffler 10 is a two-stage upper and lower muffler including an upper muffler 12 constituting an upper muffler and a lower muffler 14 constituting a lower muffler.

  As shown in FIG. 3, the upper muffler 12 includes an upper shell 18 that forms the upper part of the upper muffler 12, and a lower shell 20 that forms the lower part of the upper muffler 12. Further, the outer peripheral portion of the upper shell 18 and the outer peripheral portion of the lower shell 20 are joined to each other by a flange portion, and the upper muffler 12 has a flat hollow shape that is long in the vehicle width direction. A through hole 22 is formed in the longitudinal center of the lower wall 20A of the lower shell 20 constituting the lower wall of the upper muffler 12, and the shape of the through hole 22 is such that the front side 22A is more than the rear side 22B. It has a long trapezoidal shape.

  The lower muffler 14 has a box shape with an upper opening. The shape of the upper edge portion 14B of the side wall 14A as a connecting means constituting the wall portion of the outer periphery of the side portion of the lower muffler 14 is substantially the same trapezoid as that of the through hole 22 and is lower as shown in FIG. It is curved along the lower surface of the lower wall 20A of the shell 20, and a flange 15 is formed on the upper edge 14B toward the outside of the opening.

  As shown in FIG. 1, the flange 15 of the lower muffler 14 is welded to the lower surface of the lower wall 20 </ b> A of the lower shell 20.

  As shown in FIG. 4, a pair of left and right separators 26, 28 are attached to the inside of the upper muffler 12, and these separators 26, 28 are placed in the left muffler chamber at the left and right end portions inside the upper muffler 12. 30 and the right muffler chamber 32 are formed. Further, inside the upper muffler 12, separators 34 and 36 as connecting walls as a pair of left and right connecting means are attached inside the separators 26 and 28, and these separators 34 and 36 are connected to the left muffler chamber 30. A left inner silencing chamber 38 and a right inner silencing chamber 40 are formed inside the right silencing chamber 32. A central sound deadening chamber 42 is provided between the separator 34 and the separator 36.

  As shown in FIG. 3, the shape seen from above the separator 34 matches the shape of the left side 15 </ b> A of the flange 15 of the lower muffler 14, and the planar shape seen from above the separator 36 is the shape of the lower muffler 14. This matches the planar shape of the right side 15B of the flange 15.

A flange 34B is formed on the upper end portion of the base portion 34A of the separator 34 toward the outer side in the muffler width direction, and this flange 34B is formed on the lower surface of the upper wall 18A of the upper shell 18 constituting the upper wall of the upper muffler 12. It is welded. Further, a flange 34C is formed at the lower end portion of the base portion 34A of the separator 34 toward the outer side in the muffler width direction, and the flange 34C is welded to the upper surface of the lower wall 20A of the lower shell 20.

Further, a flange 36B is formed on the upper end portion of the base portion 36A of the separator 36 toward the outer side in the muffler width direction, and the flange 36B is welded to the lower surface of the upper wall 18A of the upper shell 18. Further, a flange 36C is formed at the lower end portion of the base portion 36A of the separator 36 toward the outer side in the muffler width direction, and the flange 36C is welded to the upper surface of the lower wall 20A of the lower shell 20.

  As shown in FIG. 1, a left side 15 </ b> A of the flange 15 of the lower muffler 14 is joined below the flange 34 </ b> C of the separator 34 with the lower wall 20 </ b> A of the lower shell 20 interposed therebetween. Further, the right side portion 15B of the flange 15 of the lower muffler 14 is coupled to the lower side of the flange 36C of the separator 36 with the lower wall 20A of the lower shell 20 interposed therebetween.

  Therefore, the load of the lower muffler 14 is supported by the lower shell 20 and is also supported by the upper shell 18 via the separator 34 and the separator 36.

  In the present embodiment, the side wall 14A of the lower muffler 14 is attached vertically below the base 34A of the separator 34 and the base 36A of the separator 36, respectively.

As shown in FIG. 3, the front end portion of the base portion 34A of the separator 34 is bent forward of the vehicle body to form a vertical wall portion 34D. The front end portion of the vertical wall portion 34D has a flange facing outward in the muffler width direction. 34F is formed. As shown in FIG. 4, the flange 34 </ b> F is joined to a portion of the front wall 12 </ b> A of the upper muffler 12 that is outside the inlet pipe 50 in the muffler width direction.

Similarly, as shown in FIG. 3, the front end portion of the base portion 36A of the separator 36 is bent forward of the vehicle body to form a vertical wall portion 36D, and the front end portion of the vertical wall portion 36D is located outward in the muffler width direction. A flange 36F is formed in the direction. As shown in FIG. 4, the flange 36 </ b> F is joined to a portion of the front wall 12 </ b> A of the upper muffler 12 that is outside the inlet pipe 50 in the muffler width direction.

As shown in FIG. 3, the rear end portion of the base portion 34A of the separator 34 is bent forward of the vehicle body to form a vertical wall portion 34E, and the rear end portion of the vertical wall portion 34E faces the outside in the muffler width direction. A flange 34G is formed. As shown in FIG. 4, the flange 34 </ b> G is joined to the rear wall 12 </ b> B of the upper muffler 12.

Similarly, as shown in FIG. 3, the rear end portion of the base portion 36A of the separator 36 is bent forward of the vehicle body to form a vertical wall portion 36E. The rear end portion of the vertical wall portion 36E has a muffler width direction. A flange 36G is formed toward the outside. As shown in FIG. 4, the flange 36 </ b> G is joined to the rear wall 12 </ b> B of the upper muffler 12.

  As shown in FIG. 2, the central silencing chamber 42 is a single silencing chamber that is not partitioned by the separator between the central portion of the upper muffler 12 and the upper portion of the lower muffler 14 through the through hole 22. In addition, a horizontal wall 24 that divides the interior of the lower muffler 14 into upper and lower sound deadening chambers is attached to the center of the lower muffler 14 in the vertical direction. The lower muffler 14 has a central silencing chamber 42 above the lateral wall 24 and a lower silencing chamber 44 below the lateral wall 24.

  A pair of inlet pipes 50 penetrates through the front wall 12A of the upper muffler 12, and the insertion-side distal end portion 50 </ b> A of the inlet pipe 50 to the upper muffler 12 reaches the front upper part of the central muffler chamber 42. The other end of the inlet pipe 50 is connected to the engine.

  A pair of first outlet pipes 52 penetrates the upper portion of the rear portion 14C of the side wall 14A of the lower muffler 14. Further, the insertion-side tip 52A of the first outlet pipe 52 to the lower muffler 14 reaches the rear lower part of the central muffler chamber 42, and is the same as the insertion-side tip 50A of the inlet pipe 50 with a predetermined interval. Oppositely arranged on the shaft. A valve 54 is attached to the other end of the first outlet pipe 52, and the valve 54 can be controlled to be opened and closed by a control device (not shown).

  A second outlet pipe 58 passes through a lower portion of the rear portion 14C of the side wall 14A of the lower muffler 14. Further, the insertion-side front end 58 </ b> A of the second outlet pipe 58 to the lower muffler 14 reaches the rear part of the lower muffler chamber 44.

  The rear part of the central silencer chamber 42 and the rear part of the left silencer chamber 30 are connected by a first inner pipe 60, and the first inner pipe 60 passes through the separator 34 and the separator 26. Accordingly, the exhaust gas in the central silencing chamber 42 flows into the left silencing chamber 30 through the first inner pipe 60.

  The rear part of the central silencing chamber 42 and the rear part of the right silencing chamber 32 are connected by a second inner pipe 62, and the second inner pipe 62 passes through the separator 36 and the separator 28. Accordingly, the exhaust gas in the central silencing chamber 42 flows into the right silencing chamber 32 through the second inner pipe 62. The second inner pipe 62 is attached coaxially with the first inner pipe 60 at a predetermined interval in the vehicle width direction.

  The right muffler chamber 32 and the left inner muffler chamber 38 are connected by a third inner pipe 64, and the third inner pipe 64 passes through the separator 28, the separator 36, and the separator 34. Accordingly, the exhaust gas in the right muffler chamber 32 flows into the left inner muffler chamber 38 through the third inner pipe 64. The third inner pipe 64 is attached in parallel near the front side of the second inner pipe 62.

  As shown in FIG. 2, the left silencer chamber 30 and the right inner silencer chamber 40 are connected by a fourth inner pipe 66, and the fourth inner pipe 66 passes through the separator 26, the separator 34, and the separator 36. ing. Accordingly, the exhaust gas in the left muffler chamber 30 flows into the right inner muffler chamber 40 through the fourth inner pipe 44.

  The fourth inner pipe 66 is attached in parallel near the front side of the third inner pipe 64.

  As shown in FIG. 1, the lower portion of the left inner silencing chamber 38 and the upper left portion of the lower silencing chamber 44 are connected by a fifth inner pipe 68 that is an exhaust pipe used as a load transmitting means. The fifth inner pipe 68 is bent in an L shape and penetrates the separator 34 and the lateral wall 24. Accordingly, the exhaust gas in the left inner silencing chamber 38 flows into the lower silencing chamber 44 through the fifth inner pipe 68.

  Similarly, the lower part of the right inner silencing chamber 40 and the upper right part of the lower silencing chamber 44 are connected by a sixth inner pipe 70 which is an exhaust pipe used as a load transmitting means. The sixth inner pipe 70 is bent in an L shape and penetrates the separator 36 and the lateral wall 24. Accordingly, the exhaust gas in the right inner silencing chamber 40 flows into the lower silencing chamber 44 through the sixth inner pipe 70.

  The fifth inner pipe 68 is welded to the peripheral edge portion of the through hole 35 formed in the separator 34 shown in FIG. 3 and the peripheral edge portion of the through hole 37 formed in the lateral wall 24. Further, the sixth inner pipe 70 is welded to the peripheral portion of the through hole 39 formed in the separator 36 shown in FIG. 3 and the peripheral portion of the through hole 41 formed in the lateral wall 24.

  Accordingly, the load of the lower muffler 14 can be transmitted to the upper muffler 12 via the fifth inner pipe 68 and the sixth inner pipe 70.

  Other pipes are also welded to the upper muffler 12, the lower muffler 14, and the separators, respectively.

  As shown in FIG. 5, when viewed from the side of the vehicle body, the third inner pipe 64 is offset downward with respect to the first inner pipe 60 and the second inner pipe 62. The fourth inner pipe 66 is offset upward with respect to the second inner pipe 62. Further, a fifth inner pipe 68 and a sixth inner pipe 70 are respectively attached below the fourth inner pipe 66.

  As shown in FIG. 4, brackets 80 are welded to both ends of the upper muffler 12 in the vehicle width direction, and the muffler 10 is attached to the vehicle body by these brackets 80. Further, the bracket 80 has a bar shape bent in an L shape, and the bracket 80 is connected to a bar-shaped connecting portion 82A protruding from a bracket 82 fixed to the vehicle body via a support rubber 84.

  Next, the flow of exhaust gas in the muffler 10 of the present embodiment will be described.

  When the engine speed is lower than a predetermined value, the valve 54 attached to the first outlet pipe 52 is closed. For this reason, the exhaust gas from the engine enters the central muffler chamber 42 from the inlet pipe 50 as indicated by arrows A0 to A2 in FIGS. 4 and 5, but cannot pass through the first outlet pipe 52. As shown by arrows A3 to A6, the second inner pipe 62, the right silencer chamber 32, the third inner pipe 64, the left inner silencer chamber 38 and the first inner pipe 60, the left silencer chamber 30, and the fourth inner pipe 66. , Flows in the order of the right inner silencing chamber 40, and then flows in the order of the fifth inner pipe 68, the lower silencing chamber 44 and the sixth inner pipe 70, and the lower silencing chamber 44 as indicated by arrows A7 to A10 in FIG. The second outlet pipe 58 is exhausted.

  On the other hand, when the engine speed is higher than a predetermined value, the valve 54 attached to the first outlet pipe 52 is opened. Therefore, as shown by arrows B0 to B4 in FIGS. 4 and 5, the exhaust gas from the engine enters the central muffler chamber 42 from the inlet pipe 50 and has a predetermined distance from the insertion-side tip 50A of the inlet pipe 50. Is exhausted from the first outlet pipe 52 which is disposed opposite to the same axis.

  When the engine speed is significantly increased, the exhaust gas from the engine is added to the flow paths indicated by arrows B0 to B4 in FIGS. 4 and 5, and the arrow A0 in FIGS. It is exhausted along the flow path indicated by ~ A10.

  Next, the operation of this embodiment will be described.

  As shown in FIG. 1, in this embodiment, the left side portion of the flange 15 formed at the upper end edge portion 14 </ b> B of the side wall 14 </ b> A of the lower muffler 14 below the flange 34 </ b> C of the separator 34 attached inside the upper muffler 12. 15A is coupled with the lower wall 20A of the lower shell 20 interposed therebetween. Further, below the flange 36C of the separator 36 attached inside the upper muffler 12, a right side portion 15B of the flange 15 formed on the upper end edge portion 14B of the side wall 14A of the lower muffler 14 is a lower wall of the lower shell 20. It is combined with 20A in between.

  Accordingly, the load of the lower muffler 14 is supported by the lower shell 20 and is also supported by the upper shell 18 via the separators 34 and 36. As a result, the lower muffler 14 can be attached to the upper muffler 12 without any external parts for attachment.

  Further, since the load acting on the lower shell 20 is reduced by the separators 34 and 36, it is not necessary to increase the thickness of the lower shell 20 in order to prevent the deformation of the lower shell 20 due to the load of the lower muffler 14.

  Further, since the separators 34 and 36 for forming a sound deadening chamber in the upper muffler 12 are used as a connecting wall for transmitting a load, it is not necessary to separately provide a connecting wall in the upper muffler 12. For this reason, the lower muffler 14 can be attached to the upper muffler 12 without increasing the number of parts.

  Further, in the present embodiment, the fifth inner pipe 68 attached in the muffler 10 has a peripheral portion of the through hole 35 formed in the separator 34 shown in FIG. The sixth inner pipe 70 attached in the muffler 10 is welded to the peripheral portion of the through hole 39 formed in the separator 36 shown in FIG. 3 and the through hole 41 formed in the lateral wall 24. Are welded to the peripheral edge of each. As a result, the load of the lower muffler 14 can be transmitted to the upper muffler 12 via the fifth inner pipe 68 and the sixth inner pipe 70. For this reason, the support rigidity of the lower muffler 14 can be improved.

  Further, since the fifth inner pipe 68 and the sixth inner pipe 70 that connect the respective silencer chambers of the muffler 10 are used as load transmitting means, it is not necessary to separately provide load transmitting means. For this reason, the support rigidity of the lower muffler 14 can be improved without increasing the number of parts.

  In the present embodiment, the muffler chamber of the upper muffler 12 formed between the separator 34 and the separator 36 communicates with the muffler chamber of the upper portion of the lower muffler 14 partitioned by the horizontal wall 24, and the central muffler chamber 42. Therefore, the capacity of the central silencing chamber 42 can be increased, and the degree of freedom in changing the capacity of the central silencing chamber 42 according to the design intention such as the silencing volume is increased. Further, the upper muffler 12 can be thinned.

Further, in the present embodiment, the mounting space for the mounting external parts is not required as compared with the configuration in which the lower muffler 14 is mounted on the upper muffler 12 by the muffler band as the mounting external parts. As a result, the muffler mounting freedom degree such as the mounting position of the muffler 10 on the vehicle body can be increased.

  Although the present invention has been described in detail with respect to specific embodiments, the present invention is not limited to such embodiments, and various other embodiments are possible within the scope of the present invention. It will be apparent to those skilled in the art. For example, in the above-described embodiment, the load of the lower muffler 14 is supported by the upper muffler 12 with the separators 34 and 36, the fifth inner pipe 68, and the sixth inner pipe 70. The load of the lower muffler 14 may be supported by the upper muffler 12 with only 36.

  In the above embodiment, as shown in FIG. 1, the side walls 14 </ b> A of the lower muffler 14 are respectively attached vertically below the base portions 34 </ b> A and 36 </ b> A of the separators 34 and 36. The side walls 14A of the lower muffler 14 are respectively attached to the bases 34A and 36A at positions deviated from the vertically lower side, and the left side 15A of the flange 15 of the lower muffler 14 or the left side 15A of the flanges 34C and 36C of the separators 34 and 36 are vertically below. A part of the right side portion 15B may be coupled with the lower wall 20A of the lower shell 20 interposed therebetween.

  Further, the flanges 34C and 36C of the separators 34 and 36 and the flange 15 of the lower muffler 14 are eliminated, and the base portions 34A and 36A of the separators 34 and 36 and the side wall 14A of the lower muffler 14 are sandwiched by the lower wall 20A of the lower shell 20. A combined configuration may be used. Also in this case, instead of the configuration in which the side wall 14A of the lower muffler 14 is attached vertically below the bases 34A and 36A of the separators 34 and 36, the lower muffler is vertically below part of the bases 34A and 36A in the separators 34 and 36, respectively. It is good also as a structure attached so that a part of 14 side wall 14A might overlap.

  Further, in the present embodiment, the separators 34 and 36 are divided into left and right, but instead of this, the front ends of the separators 34 and 36 and the rear ends of the separators 34 and 36 are walls along the vehicle width direction. It is good also as a structure which connects and makes it one part.

  In the present embodiment, the separators 34 and 36 as the connecting means and the side wall 14A of the lower muffler 14 are separate members. Instead, the separators 34 and 36 as the connecting means and the side wall 14A of the lower muffler 14 are used. , And the connecting portion between the separators 34 and 36 and the side wall 14A of the lower muffler 14 may be configured to penetrate the through hole 22 formed in the lower wall 20A of the lower shell 20. In this case, the upper muffler 12 and the lower muffler 14 are sealed by forming a flange around the through hole 22 and welding the flange to the side wall 14A of the lower muffler 14.

It is sectional drawing along the 1-1 line | wire of FIG. It is the perspective view seen from the vehicle body diagonally back which shows the muffler structure for vehicles which concerns on one Embodiment of this invention. FIG. 3 is an exploded perspective view of the vehicle muffler structure according to the embodiment of the present invention, seen from an obliquely rear side of the vehicle body, with the pipes removed in FIG. 2. It is a top view showing the muffler structure for vehicles concerning one embodiment of the present invention. FIG. 5 is a cross-sectional view taken along line 5-5 of FIG.

Explanation of symbols

10 Vehicle muffler 12 Upper muffler 14 Lower muffler 14A Side wall of lower muffler (connecting means, outer wall)
15 Flange of lower muffler 18 Upper shell of upper muffler 18A Upper wall of upper shell (upper wall of upper muffler)
20 Lower shell of upper muffler 20A Lower wall of lower shell (lower wall of upper muffler)
24 Lower muffler side wall 26 Upper muffler separator 28 Upper muffler separator 30 Upper muffler left silencing chamber 32 Upper muffler right silencing chamber 34 Upper muffler separator (connecting means, connecting wall)
36 Upper muffler separator (connecting means, connecting wall)
38 Upper left muffler chamber of upper muffler 40 Right muffler chamber of upper muffler 42 Central muffler chamber of muffler 44 Lower muffler chamber of lower muffler 68 Fifth inner pipe (load transmission means, exhaust pipe)
70 6th inner pipe (load transmission means, exhaust pipe)

Claims (7)

An upper muffler provided on the upper side in the vertical direction;
A lower muffler disposed on a vertically lower side of the upper muffler;
A connecting means for connecting the upper wall of the upper muffler in the vertical direction on the upper side and the lower wall of the lower side in the vertical direction inside the upper muffler, and supporting the load of the lower muffler;
Yes, and the connecting means extends through the lower wall of the upper muffler, the vehicle muffler structure and forming an outer wall of the lower muffler and. An upper muffler provided on the upper side in the vertical direction;
A lower muffler disposed on a vertically lower side of the upper muffler;
A connecting means for connecting the upper wall of the upper muffler in the vertical direction on the upper side and the lower wall of the lower side in the vertical direction inside the upper muffler, and supporting the load of the lower muffler;
The connecting means includes a connecting wall in the upper muffler, and an outer wall of the lower muffler coupled to the connecting wall with a lower wall of the upper muffler interposed therebetween. Construction. The vehicle muffler structure according to claim 2 , wherein the connecting wall is a separator that partitions the inside of the upper muffler to form a sound deadening chamber . The muffler structure for a vehicle according to claim 3 , wherein the muffler chamber of the upper muffler partitioned by the separator and the muffler chamber of the lower muffler form one silencer chamber not partitioned by the separator. . A lateral wall that partitions the lower muffler into upper and lower silencing chambers;
Load transmitting means for connecting the lateral wall and the connecting wall;
The vehicle muffler structure according to any one of claims 2 to 4 , wherein the vehicle muffler structure is provided. 6. The vehicle muffler structure according to claim 5 , wherein the load transmission means is an exhaust pipe that communicates a noise reduction chamber of the upper muffler and a noise reduction chamber below the lateral wall of the lower muffler. An upper muffler provided on the upper side in the vertical direction;
A lower muffler disposed on a vertically lower side of the upper muffler;
A connecting means for connecting the upper wall of the upper muffler in the vertical direction on the upper side and the lower wall of the lower side in the vertical direction inside the upper muffler, and supporting the load of the lower muffler;
The upper muffler includes an upper shell that forms an upper part of the upper muffler, and a lower shell that forms a lower part of the upper muffler and has a through hole formed therein.
The lower muffler has an upper opening that communicates with the through hole, and is formed on the upper edge of the wall portion on the outer periphery of the side portion toward the outside of the opening, and is welded to the lower surface of the lower wall of the lower shell. With a flange that
Inside the upper muffler, a separator having an upper end flange welded to the lower surface of the upper wall of the upper shell and a lower end flange welded to the upper surface of the lower wall of the lower shell is attached. The muffler structure for vehicles characterized by this .

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