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Abstract

To prevent a lid member for closing an end of a pipe from falling off from the pipe.SOLUTION: A muffler mounted on a vehicle includes an outer shell member, a pipe, and a closed part. The pipe is inserted into an opening of the outer shell member forming the internal space, and forms an exhaust flow path through which exhaust gas flows. The closing portion is provided at an end portion of the pipe that opens to the internal space, and is configured to close the exhaust flow path. The closed portion includes a slit and a lid member. The slit is provided in a wall of the pipe and extends from a first end to a second end in a direction intersecting a flow direction of the exhaust gas along the wall. The lid member includes a main body portion that closes the exhaust flow path, and an insertion portion that extends from the main body portion and is inserted into the slit.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present disclosure relates to a muffler. [Background Art]

[0002] A technology is known in which one end of a pipe, through which exhaust gas flows internally, inserted into a muffler is closed for changing the flow direction of exhaust gas and adjusting the flow rate of exhaust gas. Patent Literature 1 discloses a muffler in which one end of a pipe closed by a cap is inserted into an interior of the muffler. The cap is fixed to the pipe by being press-fitted into the interior of the pipe from the one end along the axial direction of the pipe. [Prior Art Literature] [Patent Literature]

[0003] [Patent Literature 1] Japanese Unexamined Patent Publication No. 2003-113706 [Summary of Invention] [Problem to be Solved by Invention]

[0004] However, since the above-mentioned cap is fixed to the interior of the pipe by axial press-fitting, when the pressure of exhaust gas flowing through the interior of the pipe is high, the cap is pushed by the pressure, which may cause the cap to fall off from the pipe.

[0005] One aspect of the present disclosure aims to suppress falling off of a lid member that closes an end portion of a pipe from the pipe. [Means for Solving the Problem]

[0006] One aspect of the present disclosure is a muffler mounted on a vehicle, comprising an outer shell member, a pipe, and a closing portion. The outer shell member forms an internal space. The pipe is inserted into an opening in the outer shell member and forms an exhaust passage through which exhaust gas flows. The closing portion is provided at the end of the pipe that opens into the internal space and is configured to block the exhaust passage. The closing portion also has a slit and a cover member. The slit is provided in the wall of the pipe and extends from a first end to a second end in a direction intersecting the direction of exhaust gas flow along the wall. The cover member has a main body and an insertion portion. The main body blocks the exhaust passage. The insertion portion extends from the main body and is inserted into the slit.

[0007] In this configuration, the insertion portion overlaps with the slit in the flow direction. Therefore, even if the main body is pushed in the flow direction by the pressure of the exhaust gas, the insertion portion catches on the pipe wall, and the movement of the lid member in the flow direction is easily restricted. Consequently, it is possible to prevent the lid member from falling off the pipe due to the pressure of the exhaust gas.

[0008] In one aspect of this disclosure, the insertion portion may be formed to extend from near the first end of the slit to near the second end. In this configuration, when the insertion portion is inserted into the slit, the insertion portion substantially contacts the first and second ends of the slit. This suppresses the rotation of the lid member relative to the pipe in the circumferential direction about the pipe's central axis. Therefore, it is possible to suppress circumferential displacement of the lid member placed on the pipe.

[0009] In one aspect of this disclosure, the insertion portion may have a bent portion that protrudes outward from the pipe and bends relative to the main body. With this configuration, the bent portion makes it difficult for the lid member to easily detach from the pipe. [Brief explanation of the drawing]

[0010] [Figure 1] This is a cross-sectional view along the central axis of the muffler. [Figure 2] This is a perspective view of the lid member and the inlet pipe. [Figure 3] This is a front view of the lid component. [Figure 4] Figure 4A is a perspective view of the inlet pipe with the cover member inserted through the first slit. Figure 4B is a side view of the inlet pipe with the cover member inserted through the first slit. [Figure 5] Figure 5A is a front view of the downstream end of the inlet pipe with the cover member inserted through the first slit. Figure 5B is a cross-sectional view taken along the VB-VB line in Figure 4B. [Figure 6] Figure 6A is a perspective view showing the lid member fixed to the inlet pipe by the bent portion. Figure 6B is a side view showing the lid member fixed to the inlet pipe by the bent portion. [Figure 7] This is a front view of the lid member of the first modified example. [Figure 8] This is a front view of the lid member of the second modified example. [Figure 9] This is a front view of the lid member of the third modified example. [Modes for carrying out the invention]

[0011] Hereinafter, exemplary embodiments of the present disclosure will be described with reference to the drawings. [1. Structure] The muffler 100 shown in Figure 1 constitutes a part of the exhaust passage for exhaust gas discharged from the internal combustion engine mounted on the vehicle. The muffler 100 is a device for reducing exhaust noise. The muffler 100 comprises an outer shell member 1, a separator 2, an inlet pipe 3, an outlet pipe 4, and a cover member 5.

[0012] <Outer shell component> The outer shell member 1 is a member that forms the internal space. The outer shell member 1 has a side wall 11, a first end plate 12, and a second end plate 13.

[0013] The side wall 11 is a cylindrical member. The first end plate 12 and the second end plate 13 close the openings at both ends of the side wall 11, and are arranged to face each other. The first end plate 12 has a through hole through which the inlet pipe 3 penetrates, and the second end plate 13 has a through hole through which the outlet pipe 4 penetrates.

[0014] <Separator> The separator 2 is arranged in the internal space of the outer shell member 1 so as to face the first end plate 12 and the second end plate 13. The separator 2 is fixed to the inner surface of the side wall 11, and divides the internal space of the outer shell member 1 into a first chamber 14 and a second chamber 15. The first chamber 14 is formed between the first end plate 12 and the separator 2. The second chamber 15 is formed between the separator 2 and the second end plate 13. The separator 2 has a through hole through which the inlet pipe 3 penetrates and a through hole through which the outlet pipe 4 penetrates. Further, the separator 2 has a communication hole 21 that communicates the first chamber 14 and the second chamber 15.

[0015] <Inlet pipe> As an example, the inlet pipe 3 has a substantially cylindrical shape, extends along the central axis A, and forms an exhaust flow path through which exhaust gas flows. That is, the shape of a cross section perpendicular to the central axis A of the exhaust flow path of the inlet pipe 3 (hereinafter simply referred to as a cross section) is substantially circular. In the present embodiment, the diameter of the inlet pipe 3 is substantially constant. The inlet pipe 3 is inserted into the through hole of the first end plate 12, and introduces exhaust gas into the outer shell member 1. The inlet pipe 3 penetrates the through hole of the separator 2, and its downstream end 30 opens into the second chamber 15. The inlet pipe 3 has a first slit 31, a second slit 32, and a plurality of through holes 33.

[0016] As shown in FIG. 1 and FIG. 2, the first slit 31 is provided near the downstream end 30 of the inlet pipe 3. Specifically, the first slit 31 is provided at a position slightly spaced apart from the edge of the downstream end 30. The first slit 31 is provided in the wall 301 of the inlet pipe 3 so as to penetrate through the wall 301, and extends from the first end 311 to the second end 312 along the wall 301 in a direction intersecting the flow direction of exhaust gas. The flow direction in the inlet pipe 3 coincides with the direction in which the central axis A extends. Directions intersecting the flow direction include directions perpendicular to the central axis A and directions obliquely intersecting the central axis A. In the present embodiment, the first slit 31 extends along the wall 301 of the inlet pipe 3 in a direction perpendicular to the central axis A. In other words, the first slit 31 extends in the circumferential direction centered on the central axis A.

[0017] The length from the first end 311 to the second end 312 of the first slit 31 is approximately half the circumference of the inlet pipe 3. That is, the first slit 31 extends around the central axis A by approximately half a circumference. The length of the first slit may be not less than half the circumference of the inlet pipe and less than the full circumference. The width in the direction perpendicular to the extending direction of the first slit 31 (hereinafter simply referred to as width) is substantially the same as the thickness of a cover member 5 described later, or slightly smaller than the thickness of the cover member 5. In the present embodiment, the cover member 5 is inserted through the first slit 31 and disposed in the inlet pipe 3. An overlapping portion 52 of the cover member 5 described later is inserted into the first slit 31.

[0018] The second slit 32 is provided near the downstream end 30 of the inlet pipe 3, spaced apart from the first slit 31, on a circle that includes part of the arc drawn by the first slit 31. Specifically, the second slit 32 is provided at a position opposite to the approximately central portion in the direction in which the first slit 31 extends, with respect to the central axis A. The second slit 32 is provided in the wall 301 of the inlet pipe 3 so as to penetrate the wall 301, and extends along the wall 301 in a direction intersecting the flow direction (in this embodiment, a direction perpendicular to the central axis A). The length between the two ends in the direction in which the second slit 32 extends is shorter than the length of the first slit 31. The width of the second slit 32 is approximately the same as the width of the first slit 31. The second bent portion 54 of the lid member 5, which will be described later, is inserted into the second slit 32.

[0019] As shown in Figure 1, the multiple through holes 33 are located near the downstream end 30 of the inlet pipe 3 and upstream of the first slit 31 and the second slit 32. Each through hole 33 penetrates the wall 301 of the inlet pipe 3 and connects the internal space of the inlet pipe 3 to the second chamber 15. Note that the multiple through holes 33 are not shown in Figure 2.

[0020] <Outlet pipe> The outlet pipe 4 is, for example, substantially cylindrical, extending along its central axis and forming an exhaust passage through which exhaust gas flows. The outlet pipe 4 is inserted into the through-hole of the second end plate 13 and discharges the exhaust gas introduced into the outer shell member 1. The outlet pipe 4 passes through the through-hole of the separator 2, and its upstream end 40 opens into the first chamber 14. The outlet pipe 4 is configured so that its upstream end 40 expands in diameter. However, the outlet pipe may also be configured so that its diameter is substantially constant without expanding in diameter at its upstream end.

[0021] <Lid component> The lid member 5 is a flat plate-shaped member having a substantially constant thickness. The thickness of the lid member 5 may be thin or thick. The thickness of the lid member does not have to be substantially constant. In this embodiment, the lid member 5 is inserted through the first slit 31 described above and positioned near the downstream end 30 of the inlet pipe 3. The lid member 5 is configured to overlap the exhaust passage of the inlet pipe 3 with the slits 31 and 32 in the flow direction. As a result, the downstream end 30 of the inlet pipe 3 is blocked by the lid member 5. In other words, the first slit 31 and the second slit 32 of the inlet pipe 3 described above, and the lid member 5, form a closed section that blocks the exhaust passage of the inlet pipe 3. In this embodiment, the lid member 5 blocks the entire cross-sectional area of ​​the exhaust passage of the inlet pipe 3.

[0022] As shown in Figure 3, the lid member 5 has a main body portion 51, an overlapping portion 52, a first bent portion 53, and a second bent portion 54. The main body portion 51 is a flat plate-shaped part that is positioned within the exhaust passage of the inlet pipe 3 and blocks the exhaust passage. The main body portion 51 has the same cross-sectional shape as the exhaust passage of the inlet pipe 3. For example, the main body portion 51 is approximately circular in shape and has approximately the same diameter as the circular cross-section of the exhaust passage of the inlet pipe 3.

[0023] The overlapping portion 52 is a flat plate-shaped part inserted into the first slit 31 and overlaps with the first slit 31 in the flow direction. That is, the overlapping portion 52 overlaps with the wall 301 of the inlet pipe 3 that constitutes the first slit 31 in the flow direction. The overlapping portion 52 extends radially outward from the main body portion 51 and is formed to extend from near the first end 311 of the first slit 31 to near the second end 312. That is, the overlapping portion 52 is provided along the edge of the main body portion 51 over about half a circumference. Here, the radial direction is the direction that passes through the central axis of the main body portion 51 and extends along the plane of the main body portion 51.

[0024] The first bent portion 53 and the second bent portion 54 are flat plate-shaped portions that protrude to the outside of the inlet pipe 3 and bend relative to the main body portion 51. Each bent portion 53 and 54 is used to fix the lid member 5 to the inlet pipe 3. The first bent portion 53 extends radially outward from the overlapping portion 52. The second bent portion 54 extends radially outward from the main body portion 51 so as to protrude to the outside of the inlet pipe 3 to the same extent as the first bent portion 53. Each bent portion 53 and 54 has a radial length longer than the overlapping portion 52 and a circumferential length shorter than the overlapping portion 52. The second bent portion 54 is formed to extend to the vicinity of both ends in the direction in which the second slit 32 extends. In this embodiment, the first bent portion 53 and the second bent portion 54 are positioned opposite each other in the radial direction of the main body portion 51. Specifically, the first bent portion 53 is located approximately in the center of the overlapping portion 52 in the circumferential direction. The second bent portion 54 is located approximately in the center of the circumferential direction of the edge of the main body portion 51 where the overlapping portion 52 is not formed. The second bent portion 54 is inserted into the second slit 32, and its base portion overlaps with the second slit 32, that is, the wall 301 of the inlet pipe 3 that constitutes the second slit 32, in the flow direction.

[0025] As shown in Figures 4A to 5B, when the main body 51 is positioned within the exhaust passage of the inlet pipe 3, the edges of the main body 51 in the portion where the overlapping portion 52 and the second bend portion 54 are not provided are in approximate contact with the inner circumferential surface of the inlet pipe 3. Approximate contact means that the two parts are either in contact or positioned with a small gap between them.

[0026] When the overlapping portion 52 is inserted into the first slit 31, it substantially abuts the first end 311, the second end 312, and both ends in the width direction of the first slit 31. In this embodiment, the overlapping portion 52 extends slightly outward from the outer circumferential surface of the inlet pipe 3. That is, the radial length of the overlapping portion 52 is slightly longer than the thickness of the wall 301 of the inlet pipe 3.

[0027] The first bent portion 53 protrudes to the outside of the inlet pipe 3 when the overlapping portion 52 is inserted into the first slit 31. When the second bent portion 54 is inserted into the second slit 32, it protrudes to the outside of the inlet pipe 3, and its base portion substantially abuts against both ends in the direction of extension and both ends in the width direction of the second slit 32.

[0028] As shown in Figures 6A and 6B, each bent portion 53, 54 is bent relative to the main body portion 51 after the lid member 5 is inserted through the first slit 31 and positioned on the inlet pipe 3. In this embodiment, each bent portion 53, 54 is bent at approximately 90° relative to the main body portion 51 and extends along the wall 301 of the inlet pipe 3. Note that the angle at which each bent portion is bent relative to the main body portion may be less than 90°.

[0029] In this embodiment, each bent portion 53, 54 is bent so as to extend toward the opposite side of the downstream end 30 of the inlet pipe 3. Note that each bent portion may be bent toward the downstream end 30 of the inlet pipe 3, or they may be bent toward different directions. Each bent portion 53, 54 may or may not be in contact with the wall 301 (in other words, the outer surface of the inlet pipe 3) when bent.

[0030] The exhaust gas from the internal combustion engine passes through the inlet pipe 3, as indicated by the arrows in Figure 1, and is introduced into the second chamber 15 through multiple through-holes 33 formed in the inlet pipe 3. Subsequently, the exhaust gas from the second chamber 15 is introduced into the first chamber 14 through a communication hole 21 formed in the separator 2. The exhaust gas in the second chamber 15 is then discharged to the outside through the outlet pipe 4. In this way, the exhaust gas passes through the chambers 14 and 15, which are formed by dividing the internal space of the outer shell member 1, thereby achieving a sound-dampening effect.

[0031] [2. Assembly method for the closing section] First, the lid member 5 is inserted into the inlet pipe 3 through the first slit 31 so that the second bent portion 54 passes through the first slit 31 first. At this time, the main body portion 51 is positioned within the exhaust passage of the inlet pipe 3, the overlapping portion 52 is inserted into the first slit 31, and the second bent portion 54 is inserted into the second slit 32. Subsequently, the lid member 5 is fixed to the inlet pipe 3 by bending each of the bent portions 53 and 54 relative to the main body portion 51. As a result, the exhaust passage of the inlet pipe 3 is closed by the lid member.

[0032] The bending of each bent portion 53, 54 may be performed at the same time as the process in which the inlet pipe 3, on which the separator 2 and the lid member 5 are arranged, is press-fitted into the side wall 11, by considering the arrangement of the jigs and other tools used for the bending. Alternatively, the bending of each bent portion 53, 54 may be performed in a process different from the press-fitting process described above.

[0033] [3. Effects] According to the embodiments described in detail above, the following effects can be obtained. (3a) In this embodiment, the overlapping portion 52 of the lid member 5 placed on the inlet pipe 3 overlaps with the first slit 31 in the flow direction, and the base portion of the second bent portion 54 overlaps with the second slit 32 in the flow direction. Therefore, even if the main body portion 51 is pushed in the flow direction by the pressure of the exhaust gas, the overlapping portion 52 and the base portion of the second bent portion 54 catch on the wall 301 of the inlet pipe 3, and the movement of the lid member 5 in the flow direction is easily restricted. Thus, it is possible to suppress the lid member 5 from falling off the inlet pipe 3 due to the pressure of the exhaust gas.

[0034] (3b) In this embodiment, the overlapping portion 52 is formed to extend from the vicinity of the first end 311 of the first slit 31 to the vicinity of the second end 312. That is, when the overlapping portion 52 is inserted into the first slit 31, it substantially abuts against the first end 311 and the second end 312 of the first slit 31. This suppresses the circumferential rotation of the lid member 5 relative to the inlet pipe 3. Therefore, it is possible to suppress circumferential displacement of the lid member 5 placed on the inlet pipe 3.

[0035] (3c) In this embodiment, the overlapping portion 52 extends from the vicinity of the first end 311 of the first slit 31 to the vicinity of the second end 312, and the width of the first slit 31 is approximately the same as the thickness of the lid member 5 (i.e., the thickness of the overlapping portion 52), or slightly thinner than that thickness. In other words, when the overlapping portion 52 is inserted into the first slit 31, it is in approximate contact with the first end 311, the second end 312, and both ends in the width direction of the first slit 31.

[0036] Furthermore, the second bent portion 54 extends to the vicinity of both ends in the direction in which the second slit 32 extends, and the width of the second slit 32 is approximately the same as, or slightly thinner than, the thickness of the lid member 5 (i.e., the thickness of the second bent portion 54). In other words, when the second bent portion 54 is inserted into the second slit 32, its base portion is in approximate contact with both ends in the direction in which the second slit 32 extends and both ends in the width direction.

[0037] As a result, the first slit 31 is more easily blocked by the overlapping portion 52, and the second slit 32 is more easily blocked by the second bending portion 54. Therefore, leakage of exhaust gas from the first slit 31 and the second slit 32 can be suppressed.

[0038] (3d) In this embodiment, the lid member 5 has a first bent portion 53 and a second bent portion 54, and each bent portion 53, 54 is bent relative to the main body portion 51 after the lid member 5 is inserted from the first slit 31 and positioned on the inlet pipe 3. Therefore, the first bent portion 53 and the second bent portion 54 make it difficult for the lid member 5 to easily come off the inlet pipe 3. In other words, the lid member 5 can be easily fixed to the inlet pipe 3.

[0039] (3e) In this embodiment, the first slit 31 extends around the central axis A by approximately half a turn. Therefore, it is easy to insert and remove the lid member 5 into the first slit 31. Consequently, it is easy to attach the lid member 5 to the inlet pipe 3.

[0040] In this embodiment, the through-hole in the first end plate 12 corresponds to an example of an opening in the outer shell member, the inlet pipe 3 corresponds to an example of a pipe, and the downstream end 30 corresponds to an example of an end that opens into the internal space of the pipe. Also, the first slit 31 and the second slit 32 correspond to an example of a slit, the overlapping portion 52 and at least the root portion of the second bent portion 54 correspond to an example of an insertion portion, and the first bent portion 53 and the second bent portion 54 correspond to an example of a bent portion.

[0041] [4. Other Embodiments] While embodiments of this disclosure have been described above, it goes without saying that this disclosure is not limited to the embodiments described above and can take various forms.

[0042] (4a) In the above embodiment, the lid member 5 had two bent portions, a first bent portion 53 and a second bent portion 54, and the first bent portion 53 and the second bent portion 54 were arranged in positions facing each other in the radial direction of the main body portion 51. However, the configuration of the lid member is not limited to this. For example, the first bent portion and the second bent portion of the lid member may be arranged in positions that do not face each other in the radial direction of the main body portion.

[0043] Furthermore, for example, the number of bent portions in the lid member may be one or three or more. For example, as shown in Figure 7, the lid member 5a of the first modified example may have a main body portion 51a, an overlapping portion 52a, and a second bent portion 54a. In other words, the lid member 5 of the above embodiment may not have a first bent portion 53. The same effects as (3a) to (3c) of the above embodiment can be obtained with the configuration of the lid member 5a of the first modified example. Also, the lid member 5 can be made less likely to come off the inlet pipe 3 by the second bent portion 54a alone.

[0044] Furthermore, as shown in Figure 8, for example, the lid member 5b of the second modified example may have a configuration that includes two other bent portions 55 in addition to the main body portion 51b, the overlapping portion 52b, the first bent portion 53b, and the second bent portion 54b. The two other bent portions 55 extend radially outward from the overlapping portion 52 and are spaced apart on both sides of the first bent portion 53b in the circumferential direction. The configuration of the lid member 5b of the second modified example also provides the same effects as (3a) to (3c) of the above embodiment. In addition, the lid member 5 can be firmly fixed by the inlet pipe 3 by the first bent portion 53b, the second bent portion 54b, and the two other bent portions 55.

[0045] Furthermore, for example, the cover member may have a configuration without a bent portion. In this case, when the muffler is mounted on the vehicle, the inlet pipe is positioned on the muffler such that the first slit into which the overlapping portion is inserted faces vertically upward. Even if the cover member does not have a bent portion, the overlapping portion inserted into the first slit easily restricts the movement of the cover member in the flow direction. Therefore, it is possible to prevent the cover member from falling off the inlet pipe due to the pressure of the exhaust gas.

[0046] (4b) In the above embodiment, the first bent portion 53 and the second bent portion 54 were configured to protrude to the outside of the inlet pipe 3 and bend relative to the main body portion 51, but the configuration of the bent portion is not limited to this. For example, the bent portion may be configured to protrude to the outside of the inlet pipe and not bend relative to the main body portion.

[0047] Furthermore, for example, the bent portion does not have to protrude to the outside of the inlet pipe. Specifically, for example, the bent portion may be configured to extend from the main body by a length approximately equal to the thickness of the inlet pipe wall when inserted into the slit. Alternatively, for example, the bent portion may be configured to be located outside the inner circumferential surface of the inlet pipe and inside the outer circumferential surface of the inlet pipe when inserted into the slit.

[0048] Furthermore, the second bent portion 54 extended to the vicinity of both ends in the direction in which the second slit 32 extends. However, for example, the second bent portion may extend along the edge of the main body in a manner shorter than the length between the two ends in the direction in which the second slit extends.

[0049] (4c) In the above embodiment, the overlapping portion 52 was configured to extend from the vicinity of the first end 311 of the first slit 31 to the vicinity of the second end 312, and to extend slightly outward from the outer circumferential surface of the inlet pipe 3. However, the configuration of the overlapping portion is not limited to this. For example, the overlapping portion may extend along the edge of the main body in a manner shorter than the length from the first end to the second end of the first slit. Also, for example, the overlapping portion does not have to extend outward from the inlet pipe. Specifically, for example, the overlapping portion may be configured to extend from the main body by a length approximately equal to the thickness of the wall of the inlet pipe when inserted into the first slit. Also, for example, the overlapping portion may be configured to be located outside the inner circumferential surface of the inlet pipe and inside the outer circumferential surface of the inlet pipe when inserted into the first slit.

[0050] (4d) In the above embodiment, the lid member 5 is fixed to the inlet pipe 3 by the bent portions 53 and 54 that are bent relative to the main body portion 51, but the method of fixing the lid member is not limited to this. For example, the lid member and the inlet pipe may be fixed by welding. In this case, welds are provided on the overlapping portion and bent portion that are inserted into the slit of the inlet pipe. Examples of welding methods include spot welding and MIG welding. Alternatively, for example, the thickness of the lid member 5 may be slightly thicker than the slit, and the lid member 5 may be press-fitted into the inlet pipe along the slit, that is, in a direction intersecting the flow direction.

[0051] (4e) In the above embodiment, the lid member 5 blocked the entire area of ​​the cross-section of the exhaust passage of the inlet pipe 3. However, the lid member may be configured to block only a portion of the cross-section of the exhaust passage of the inlet pipe 3. That is, the exhaust passage on the upstream and downstream sides of the lid member may be in communication in a portion of the cross-section. For example, as shown in Figure 9, the lid member 5c of the third modified example may be configured to have a main body portion 51c with a through hole 56, an overlapping portion 52c, a first bent portion 53c and a second bent portion 54c. The position where the through hole is provided in the main body portion may be, for example, a position that overlaps with the cross-section of the passage in the flow direction, not necessarily the approximate center of the main body portion.

[0052] (4f) In the above embodiment, the first slit 31 and the second slit 32 extended along the wall 301 of the inlet pipe 3 in a direction perpendicular to the central axis A, as a direction intersecting the central axis A. However, for example, the first slit and the second slit may extend along the wall of the inlet pipe, intersecting the central axis A at an angle.

[0053] (4g) In the above embodiment, the cross-sectional shape of the exhaust passage of the inlet pipe 3 was substantially circular, and the main body portion 51 was substantially circular. However, for example, the cross-sectional shape of the exhaust passage of the inlet pipe and the shape of the main body portion may be elliptical or polygonal. It is preferable that the cross-sectional shape of the exhaust passage of the inlet pipe and the shape of the main body portion be the same.

[0054] (4h) In the above embodiment, the closing portion was provided near the downstream end 30 of the inlet pipe 3, but the pipe on which the closing portion is provided is not limited to the inlet pipe. For example, the closing portion may be provided near the upstream end of the outlet pipe. Also, for example, the closing portion may be provided in the inner tube of a double-wound muffler.

[0055] (4i) The functions of one component in the above embodiment may be distributed among multiple components, or the functions of multiple components may be integrated into one component. Also, some parts of the configuration of the above embodiment may be omitted. Also, at least some parts of the configuration of the above embodiment may be added to, replaced with, or otherwise adapted to the configuration of other above embodiments. [Explanation of Symbols]

[0056] 1...Outer shell member, 2...Separator, 3...Inlet pipe, 4...Outlet pipe, 5, 5a~5c...Lid member, 11...Side wall, 12...First end plate, 13...Second end plate, 14...First chamber, 15...Second chamber, 21...Communication hole, 30...Downstream end, 31...First slit, 32...Second slit, 33, 56...Through hole, 40...Upstream end, 51, 51a~51c...Main body, 52, 52a~52c...Overlapping part, 53, 53b, 53c...First bend, 54, 54a~54c...Second bend, 55...Other bend, 100...Muffler, 301...Wall, 311...First end, 312...Second end, A...Central axis.

Claims

1. A muffler mounted on a vehicle, An outer shell member that forms the internal space, A pipe inserted into the opening of the outer shell member and forming an exhaust passage through which exhaust gas flows, A closing portion is provided at the end of the pipe that opens into the internal space and is configured to block the exhaust passage, Equipped with, The closing part is, A slit is provided in the wall of the pipe, extending from the first end to the second end in a direction intersecting the flow direction of the exhaust gas along the wall, The lid member has a main body portion that blocks the exhaust passage and an insertion portion that extends from the main body portion and is inserted into the slit, The insertion portion of the muffler protrudes to the outside of the pipe and has a bent portion that bends relative to the main body.

2. The muffler according to claim 1, The insertion portion is formed to extend from near the first end of the slit to near the second end of the muffler.

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