JP2022108961A - exhaust unit - Google Patents

Abstract

To suppress generation of a large friction sound in the case where a plurality of components come into contact at a rise part, in an exhaust unit which includes the plurality of components.SOLUTION: An exhaust unit which includes a plurality of components includes a first member and a second member as the plurality of components. The first member includes a body part and a rise part. The body part is constituted in a plate-like shape. The rise part is a cylindrical portion which rises from the body part. The second member is constituted so as to be positioned in a state of being in contact with the rise part of the first member. The rise part has a relaxation part for relaxing the contact state of the first member and the second member.SELECTED DRAWING: Figure 2

Description

The present disclosure relates to an exhaust unit that includes multiple parts.

For example, Patent Document 1 below discloses a muffler as an exhaust unit. This muffler includes a separator that divides the internal space of the muffler. The separator has an insertion hole through which the pipe is inserted. A raised portion is formed around the insertion hole by burring. In order to allow the pipe to expand and contract due to thermal deformation, the pipe is passed through the separator without being fixed.

JP 2018-115576 A

However, in the above configuration, when the pipe expands and contracts due to thermal deformation, friction between the pipe and the separator may generate a large fricative noise. This problem may also occur in an exhaust unit configured such that a plurality of parts that are thermally deformed by exhaust contact at rising portions.

One aspect of the present disclosure is to suppress the generation of a large fricative sound in an exhaust unit including a plurality of parts when the plurality of parts come into contact with each other at their rising portions.

One aspect of the present disclosure is an exhaust unit that includes multiple components. The exhaust unit includes a first member and a second member as a plurality of parts.
The first member includes a body portion and a rising portion. The main body is configured in a plate shape. The rising portion is a tubular portion that rises from the main body portion. The second member is positioned in contact with the raised portion of the first member. The rising portion includes a relief portion that relieves the contact state between the first member and the second member.

According to such a configuration, since the relief portion relieves the contact state of the first member and the second member at the rising portion, for example, the contact force between the first member and the second member, the first member and the second member It is possible to reduce the magnitude of the frictional force generated between the first member and the second member when the members are thermally deformed. Therefore, it is possible to suppress the occurrence of a large fricative sound between the first member and the second member.

In one aspect of the present disclosure, the second member may be configured as a pipe that serves as an exhaust flow path. The body portion may include an insertion hole through which the second member is inserted. The raised portion may be configured as a burring portion that surrounds the insertion hole and contacts the pipe.
According to such a configuration, when the contact force between the first member and the second member tends to increase due to thermal deformation, the frictional force generated by the thermal deformation of the first member is relieved by the relief portion. easier. Therefore, it is possible to suppress the friction noise caused by the frictional force between the burring portion of the first member and the second member.

In one aspect of the present disclosure, the second member may be configured as a tubular member arranged to surround the main body. The rising portion may be arranged along the outer periphery of the body portion and configured to contact the inner peripheral surface of the second member.
According to such a configuration, it is possible to suppress frictional noise caused by the frictional force between the first member and the second member arranged outside the first member.

In one aspect of the present disclosure, the relief portion may be configured such that the rising height of some portions of the rising portion is lower than the rising height of other portions of the rising portion.
According to such a configuration, while ensuring the strength of the first member by ensuring the rising height, the relief portion is configured to be lower than the rising height of other portions of the rising portion, so that the second member The rising portion of the first member can be easily deformed when thermally deformed. Therefore, the frictional force between the first member and the second member can be reduced.

In one aspect of the present disclosure, the relief portion may comprise undulations configured such that the height of the raised portion varies continuously.
According to such a configuration, since the relief portion can be configured as a wavy portion whose height continuously changes, it is possible to suppress the occurrence of stress concentration in the relief portion.

In one aspect of the present disclosure, the relief portion may include a notch portion obtained by notching a portion of the rising portion in the height direction.
According to such a configuration, since the relief portion can be configured as a notch, the relief portion can have a simple shape.

In one aspect of the present disclosure, the relief portion includes a notch portion having a shape obtained by notching a part of the rising portion, and the notch portion is a portion cut away from the tip of the rising portion toward the main body portion. may be configured to gradually narrow in width.
According to such a configuration, since the relief portion is configured such that the width of the notch portion gradually narrows from the tip toward the main body portion, stress concentration in the relief portion can be suppressed. Therefore, it is possible to easily achieve both maintenance of strength and suppression of frictional force.

In one aspect of the present disclosure, the relief portion may be configured such that the end portion of the notch portion on the main body portion side has a curved shape.
According to such a configuration, it is possible to suppress the occurrence of stress concentration at the end portion of the notch portion on the main body portion side, and it is possible to suppress the occurrence of defects such as cracks due to processing.

In one aspect of the present disclosure, the relief portion may be configured such that the notch portion extends to a region of the body portion.
According to such a configuration, it is possible to further suppress the frictional force between the first member and the second member.

In one aspect of the disclosure, the exhaust unit may be configured as a muffler. The first member may be configured as a separator that partitions the internal space of the muffler. The second member may be configured as a tubular member combined with the separator.

According to such a configuration, it is possible to suppress a large fricative noise generated in the muffler.

It is a central sectional view of a muffler. It is a perspective view of the separator of the embodiment. FIG. 4 is a schematic diagram showing how frictional force is generated between a separator and a pipe; It is a graph which shows the relationship between expansion-contraction amount and elastic force. FIG. 11 is a perspective view of a separator of a first modified example; FIG. 11 is a perspective view of a separator of a second modified example; It is an end view (part 1) which shows the relaxation part of another form. It is an end view (2) which shows the relief part of another form. It is an end elevation (3) which shows the relief part of another form. FIG. 11 is a perspective view of a separator of a third modified example; FIG. 11 is a perspective view of a separator according to a fourth modified example; FIG. 11 is a perspective view of a separator of a fifth modified example; FIG. 11 is a perspective view of a separator of a sixth modified example; FIG. 21 is a perspective view of a separator of a seventh modified example;

Hereinafter, embodiments of the present disclosure will be described with reference to the drawings.
[1. embodiment]
[1-1. Configuration of Embodiment and Configuration and Relationship of Present Disclosure]
The muffler 1 in the embodiment corresponds to the exhaust unit in the present disclosure. The exhaust unit forms part of an exhaust system into which the exhaust of the internal combustion engine is introduced. The separators 50A to 50J in the embodiment correspond to the first member in the present disclosure, and the inlet pipe 40, the outlet pipe 45 and the outer shell member 20 in the embodiment correspond to the second member in the present disclosure. . Further, the first holes 56A, 56B, 56C and the second holes 55A, 55B, 55C in the embodiment correspond to the insertion holes in the present disclosure, and the outer shell member 20 in the embodiment corresponds to the corresponds to the cylindrical member of

[1-2. Constitution]
For example, as shown in FIG. 1, the muffler 1 of the embodiment is formed in a columnar shape extending in the first direction 17, and has a substantially elliptical cross section perpendicular to the first direction 17. As shown in FIG. As an example, the muffler 1 is mounted on the vehicle such that the short axis of the cross section extends substantially vertically. Hereinafter, when the muffler 1 is mounted on a vehicle, one side along the longitudinal axis of the cross section of the muffler 1 is referred to as the right side, and the other side is referred to as the left side.

The first direction 17 in this embodiment substantially coincides with the axial direction of first hole portions 56A, 56B, 56C and second hole portions 55A, 55B, 55C, which will be described later. In addition, the shape of the cross section extending in the first direction in the first hole portions 56A, 56B, 56C and the second hole portions 55A, 55B, 55C may be circular, polygonal, or uneven on the outer periphery. It may be

The muffler 1 is constructed by combining a plurality of parts. The parts here can include, for example, members affected by heat from the exhaust, members forming part of the exhaust pipe, members in contact with the exhaust pipe, members holding the exhaust pipe, and the like.

In order to reduce exhaust noise, the muffler 1 is provided in a flow path of exhaust from an internal combustion engine such as a vehicle engine, and has an internal space 10 for reducing exhaust noise. The muffler 1 includes, as a plurality of parts, an outer shell member 20, an inlet pipe 40, an outlet pipe 45, a first separator 50A, a second separator 50B, and a third separator 50C. The first separator 50A, the second separator 50B, and the third separator 50C are also referred to as the separators 50 below.

The internal space 10 is divided into a first area 11 , a second area 12 , a third area 13 and a fourth area 14 by the outer shell member 20 and the separators 50 . Among the plurality of regions formed together with the outer shell member 20, the first region 11 is the region between the first end plate 25 and the first separator 50A, and the second region 12 is the region between the first separator 50A and the first separator 50A. This is the area between the second separator 50B. The third region 13 is the region between the second separator 50B and the third separator 50C, and the fourth region 14 is the region between the third separator 50C and the second end plate 30. As shown in FIG.

[Outer shell member]
The outer shell member 20 is a wall-like member that separates the internal space 10 from the outside of the muffler 1 . The outer shell member 20 includes an outer peripheral portion 21 , a first end plate 25 and a second end plate 30 .

The outer peripheral portion 21 is a tubular portion that surrounds the internal space 10 and extends in the first direction 17 . The outer peripheral portion 21 has a substantially constant outer peripheral length and a substantially elliptical cross section perpendicular to the first direction 17 .
The first end plate 25 and the second end plate 30 are substantially oval lid-shaped members. The first end plate 25 covers an opening formed at one end of the outer peripheral portion 21 , and the second end plate 30 covers an opening formed at the other end of the outer peripheral portion 21 .

A first hole 27 through which the inlet pipe 40 is inserted is formed in the first end plate 25 . Further, the second end plate 30 is formed with a second hole 32 through which the outlet pipe 45 is inserted.

[Inlet pipe and outlet pipe]
The inlet pipe 40 is a pipe-shaped member that extends substantially linearly along the first direction 17 and is arranged to pass through the first end plate 25 . The thickness of the inlet pipe 40 is substantially constant, and the cross section of the inlet pipe 40 perpendicular to the first direction 17 is, for example, substantially circular.

The inlet pipe 40 protrudes from the first end plate 25 into the internal space 10 and passes through the first holes 56A, 56B and 56C of the first separator 50A, the second separator 50B and the third separator 50C.

With this configuration, the outer peripheral surface of the inlet pipe 40 is supported by the edges of the first holes 56A, 56B, 56C of the separators 50. As shown in FIG. Further, the tip portion 42 of the inlet pipe 40 is arranged in the fourth region 14 . Then, the exhaust that has flowed into the inlet pipe 40 passes through the inlet pipe 40 and flows out from the distal end portion 42 to the fourth region 14 .

On the other hand, the outlet pipe 45 is also a pipe-shaped member that extends substantially linearly along the first direction 17 and is arranged to pass through the second end plate 30 . The thickness of the outlet pipe 45 is substantially constant, and the cross section of the outlet pipe 45 perpendicular to the first direction 17 is, for example, substantially circular.

The outlet pipe 45 protrudes from the second end plate 30 into the internal space 10 and passes through the second holes 55A, 55B, 55C of each separator 50 . That is, the outer peripheral surface of the outlet pipe 45 is supported by the edges of the second holes 55A, 55B, 55C of the separators 50. As shown in FIG. Also, the tip portion 46 of the outlet pipe 45 is arranged in the first region 11 and faces the first end plate 25 . Exhaust gas that has flowed into the outlet pipe 45 from the tip portion 46 of the outlet pipe 45 passes through the outlet pipe 45 and flows out of the muffler 1 .

In the following description, the inlet pipe 40 and the outlet pipe 45 are collectively referred to as the pipes 40 and 45 as well.
[Separator]
Each separator 50 is a plate-like member that partitions the internal space 10 . Each separator 50 is arranged along the first direction 17 , and is arranged such that a surface constituting a main body portion 51 (to be described later) is substantially orthogonal to the first direction 17 . Each separator 50 is arranged facing the first and second end plates 25 , 30 respectively, and each separator 50 is located between the first end plate 25 and the second end plate 30 . Further, the edge portion 57 (see FIG. 2) of each separator 50 is joined to the inner wall of the outer peripheral portion 21 by, for example, welding.

The second separator 50B has the same configuration as the first separator 50A. Also, the third separator 50C is slightly different in configuration from the first separator 50A, but has substantially the same configuration and has the same function. Therefore, the first separator 50A will be described as a representative of the separators 50 below. The second separator 50B and the third separator 50C need only have the same function as the first separator 50A, and need not have the same configuration.

The first separator 50A includes a body portion 51, rising portions 52, and edge portions 57, as shown in FIG.
The body portion 51 is a plate-like portion having a flat surface or a curved surface with a large radius of curvature (that is, a curved surface close to a flat surface). The body portion 51 faces the first and second end plates 25 and 30 and has a substantially elliptical shape. A first hole portion 56A, a second hole portion 55A, and a plurality of holes 58 are formed in the body portion 51 . The first hole portion 56A and the second hole portion 55A are portions through which the pipes 40 and 45 are inserted as described above.

The plurality of holes 58 are holes for communicating the first region 11 to the fourth region 14, and the exhaust gas existing in the first region 11 to the fourth region 14 passes through the plurality of holes 58 to other regions. can flow into
Both the rising portion 52 and the edge portion 57 are tubular portions rising from the body portion 51 . The edge portion 57 is arranged so as to surround the body portion 51 and configured as a wall surface rising vertically from the body portion 51 .

The “cylindrical portion” of the rising portion 52 and the edge portion 57 indicates one or a plurality of wall-shaped portions arranged so as to surround some object. The “cylindrical portion” does not need to surround the entire circumference of some object, but only needs to surround a part of some object with one or a plurality of divided portions. In the configuration of this embodiment, the rising portion 52 only needs to surround at least part of the first hole portion 56A and the second hole portion 55A. Moreover, the edge portion 57 only needs to surround at least a portion of the main body portion 51 .

The rising portion 52 includes a burring portion 53 and a relief portion 54A. The burring portion 53 is formed around the first hole portion 56A and the second hole portion 55A when the first hole portion 56A and the second hole portion 55A are punched by, for example, a known burring process. The burring portion 53 is configured as a wall surface rising vertically from the body portion 51 so as to surround the first hole portion 56A and the second hole portion 55A.

The burring portion 53 has a function of reinforcing the body portion 51 . The burring portion 53 corresponds to the edge portions of the first hole portions 56A, 56B, 56C and the edge portions of the second hole portions 55A, 55B, 55C described above. It has a function to support 40,45. The pipes 40 and 45 are press-fitted into the first hole portion 56A and the second hole portion 55A and brought into contact with the burring portion 53 to be positioned between the first separator 50A.

Here, the pipes 40 and 45 in this embodiment are not completely fixed to the first separator 50A by welding or the like. Moreover, the pipes 40 and 45 do not have to be press-fitted into the first hole portion 56A and the second hole portion 55A, and may be inserted so as to contact the burring portion 53 .

In the structure of this embodiment, as shown in FIG. 3, when the pipes 40 and 45 are thermally deformed, the pipes 40 and 45 expand and contract, and the main body portion 51 and the burring portion 53 are deformed. Specifically, when the temperature of the exhaust gas supplied from the internal combustion engine is high, the pipes 40 and 45 tend to expand and stretch. easily returns to its original size.

At this time, an elastic force is generated in the body portion 51 and the burring portion 53 . When an elastic force is generated in the body portion 51 and the burring portion 53, a frictional force F is generated between the pipes 40, 45 and the burring portion 53, and when the frictional force F cannot withstand the elastic force, the body portion 51 and the burring portion 53 tries to return to its original shape. At this time, since the burring portion 53 rubs against the pipes 40 and 45, a loud fricative noise may be generated.

The magnitude of the friction noise generated between the burring portion 53 and the pipes 40 and 45 tends to increase as the elastic force generated in the main body portion 51 and the burring portion 53 increases. That is, as shown in FIG. 4, as long as the frictional force F can withstand the elastic force, the elastic force increases as the amount of expansion and contraction of the pipes 40 and 45 increases. However, if the body portion 51 and the burring portion 53 return to their original shapes before the elastic force increases, the elastic force does not increase, and the friction noise does not increase.

In other words, in the separator 50A, as shown in FIG. 4, the elastic force is not released after the amount of expansion and contraction reaches Δb, which is larger, but the elastic force is released when the amount of expansion and contraction reaches Δa, which is smaller. It should be configured as follows.

In order to configure in this way, the maximum frictional force F should be reduced. In this embodiment, the contact state between the burring portion 53 and the pipes 40, 45 is reduced, and in particular, the normal force N on the contact surface between the burring portion 53 and the pipes 40, 45 is reduced. configured to

Specifically, as shown in FIG. 2, the rising portion 52 includes a relaxing portion 54A. The relieved portion 54A is a portion processed to relieve the contact state between the separator 50A and the pipes 40 and 45. As shown in FIG. The relief portion 54A is configured such that the rising height of a portion of the rising portion 52 is lower than the rising height of other portions of the rising portion 52 .

The processing for relaxing the contact state of the relaxing portion 54A may be formed at the same time as the rising portion 52 is formed, or may be formed in a separate step after the rising portion 52 is formed.

In the burring portion 53 of the present embodiment, processing for notching a portion of the rising portion 52 (here, the burring portion 53) is adopted as processing for reducing the contact state, and the relief portion 54A is formed by notching by this processing. It is organized as a part. The relief portion 54A is formed so that the width of the notch portion gradually narrows from the tip of the burring portion 53 (ie, the portion furthest from the main body portion 51) toward the root (that is, the portion closest to the main body portion 51). Configured.

Further, the relief portion 54A is configured such that the end portion of the notch portion on the main body portion 51 side has a curved shape. This is to suppress the occurrence of stress concentration at the end portion of the notch portion on the main body portion 51 side.
By providing the relief portion 54A in this way, the normal force N on the contact surface between the burring portion 53 and the pipes 40 and 45 becomes smaller than when the relief portion 54A is not provided, and the separator 50A and the pipes 40 and 40 45 can be relaxed.

[1-3. effect]
According to 1st Embodiment detailed above, there exist the following effects.
(1a) One aspect of the present disclosure is a muffler 1 comprising multiple parts. The muffler 1 includes separators 50 and pipes 40 and 45 as a plurality of parts.

Each separator 50 includes a main body portion 51 and rising portions 52 . The body portion 51 is configured in a planar shape. The rising portion 52 is a cylindrical portion that rises from the body portion 51 . The pipes 40 , 45 are configured to be positioned relative to each separator 50 while in contact with the rising portion 52 of each separator 50 . The rising portion 52 includes a relief portion 54A processed to relieve the contact state between the separators 50 and the pipes 40 and 45 .

According to such a configuration, the relief portion 54A can relieve the contact state between the separators 50 and the pipes 40 and 45 at the rising portion 52 . Therefore, when the separators 50 and the pipes 40 and 45 are thermally deformed, the magnitude of the frictional force generated between the separators 50 and the pipes 40 and 45 can be reduced. Therefore, it is possible to suppress the generation of large fricative noise between the separators 50 and the pipes 40 and 45 .

(1b) In one aspect of the present disclosure, the body portion 51 has first hole portions 56A, 56B, and 56C and second hole portions 55A, 55B, and 55C through which the pipes 40 and 45 serving as exhaust flow paths are inserted. Prepare. The rising portion 52 includes a burring portion 53 that surrounds the first hole portions 56A, 56B, 56C and the second hole portions 55A, 55B, 55C and contacts the pipes 40,45.
According to such a configuration, it is possible to suppress frictional noise caused by the frictional force between each separator 50 and the pipes 40 and 45 inserted through each separator 50 .

(1c) In one aspect of the present disclosure, the relief portion 54A is configured such that the rising height of some portions of the rising portion 52 is lower than the rising height of other portions of the rising portion 52 .
According to such a configuration, it is possible to reduce the frictional force between each separator 50 and the pipes 40 and 45 while ensuring the strength of each separator 50 by ensuring the rising height.

(1d) In one aspect of the present disclosure, the relief portion 54A includes a notch portion having a shape obtained by notching a part of the rising portion 52, and the notch portion is cut from the tip toward the main body portion 51 side. It is configured such that the width of the notch portion gradually narrows.
According to such a configuration, it is possible to easily achieve both maintenance of strength and suppression of frictional force.

(1e) In one aspect of the present disclosure, the relief portion 54A is configured such that the end portion of the notch portion on the main body portion 51 side has a curved shape.
According to such a configuration, it is possible to suppress the occurrence of stress concentration on the side of the main body portion 51 of the notch portion, and it is possible to suppress the occurrence of defects such as cracks due to processing.

(1f) In one aspect of the present disclosure, each separator 50 is configured as each separator 50 that partitions the internal space 10 in the muffler 1 . The pipes 40 and 45 are configured as cylindrical members combined with each separator 50 .
According to such a configuration, it is possible to suppress a large fricative noise generated in the muffler 1 .

[2. Other embodiments]
Although the embodiments of the present disclosure have been described above, the present disclosure is not limited to the above-described embodiments, and various modifications can be made.

[2-1. First modification]
In the relief portion 54A of the above-described embodiment, the cutout portion extends to such an extent that it does not reach the region of the main body portion 51, but the present invention is not limited to this. For example, it may be configured like the separator 50D of the first modified example shown in FIG. The relief portion 54B of the separator 50D may be configured such that the notch portion extends to the area of the body portion 51 .

With this configuration, the burring portion 53 can be displaced with a smaller force, so the frictional force between each separator 50 and the pipes 40 and 45 can be further suppressed.

[2-2. Second modification]
In the above-described embodiment, the relief portion 54A is configured as a notch portion having a relatively wide width, but the relief portion 54A is not limited to this. For example, it may be configured like the separator 50E of the second modified example shown in FIG. The relief portion 54C of the separator 50E may be configured as a notch portion obtained by notching a portion of the rising portion 52 in the height direction. The notch here is configured as a slit, which is a groove with a relatively narrow width.

More specifically, the slit indicates that the length in the height direction of the rising portion 52, that is, the length of the notch portion is longer than the length of the circumferential direction of the rising portion 52, that is, the width of the notch portion. .
According to such a configuration, since the relief portion 54C can be configured as a slit, the relief portion 54C can have a simple shape.

[2-3. Modified example of the shape of the relaxation part]
As shown in FIGS. 7 to 9, the width and length of the cutouts of the relaxing portions 54D to 54H may be set arbitrarily. For example, the width of the cutout portion may be set relatively narrow as in the relief portion 54D shown in FIG. 7, or the width of the cutout portion may be set relatively wide as in the relief portion 54F illustrated in FIG. may be set. Alternatively, the width of the upper end portion of the notch portion may be gradually increased as in the relief portion 54H shown in FIG.

Alternatively, the depth of the notch portion may be set relatively shallow as in the relaxation portion 54D shown in FIG. 7 and the relaxation portion 54F shown in FIG. The depth of the notch portion may be set relatively deep, like the relief portion 54G indicated by the dashed line of 8 .

[2-4. Third to fifth modifications]
As shown in FIGS. 10 to 12, the position of the relaxation portion 54C can be set arbitrarily. 10 to 12 exemplify the relaxing portion 54C configured as a slit, the shape of the relaxing portion 54C can be set arbitrarily, and a different shape may be adopted for each relaxing portion 54C. .

In the separator 50F of the third modified example shown in FIG. 10, one relaxing portion 54C is arranged in each burring portion 53, and these relaxing portions 54C are arranged at the farthest positions from each other. In a separator 50G of the fourth modified example shown in FIG. 11, relief portions 54C are arranged at positions facing each other on the circumference of each burring portion 53, respectively. In the example shown in FIG. 11, each burring portion 53 is provided with two relaxation portions 54C, and in a separator 50H of the fifth modification shown in FIG. 12, each burring portion 53 is provided with four relaxation portions 54C.

[2-5. Sixth modification]
As shown in the separator 50I of the sixth modified example in FIG. 13, the rising portion 52 need not have a constant height. That is, the relaxing portion 54I may be configured as a wave-shaped portion configured such that the height of the rising portion 52 changes continuously.
According to such a configuration, since the relief portion 54I is configured as a wavy portion whose height changes continuously, it is possible to suppress the occurrence of stress concentration due to the provision of the relief portion 54I. It should be noted that the relaxing portion 54I configured as a wavy portion may be employed in combination with another relaxing portion (for example, the relaxing portion 54C, etc.).

[2-6. Seventh Modification]
In the above embodiment, the configuration for suppressing the frictional noise generated by a member and the member inserted through this member, that is, the frictional noise between the pipes 40 and 45 and the rising portion 52 of the separator 50A has been described. is not limited to For example, one aspect of the present disclosure may be configured to suppress fricative noise generated between a certain member and members arranged around the member. Specifically, it may be configured to suppress the frictional noise generated between the separator 50J and the outer shell member 20 of the seventh modified example.

In this case, for example, as shown in FIG. 14, the edge portion 57 of the separator 50J is arranged along the outer periphery of the main body portion 51 and is configured to be in contact with the inner peripheral surface of the outer shell member 20. 57 may be provided with a relief portion 57A. As with the relaxation portions 54A to 54H described above, the relief portion 57A may have any shape as long as the edge portion 57 is notched. In this configuration, the separator 50J is arranged without being completely fixed by welding or the like to the outer shell member 20 arranged around the separator 50J.

According to such a configuration, it is possible to suppress frictional noise caused by the frictional force between each separator 50 and the outer shell member 20 arranged outside each separator 50 .
Note that the separators 50D to 50J of each of Modifications 1 to 7 can be applied to the muffler 1 as each of the separators 50 described above.

[2-7. Other Modifications]
(2a) In the above embodiment, the present disclosure is applied to the muffler 1, but it is not limited to this configuration. For example, the present disclosure may be applied to a combination of parts necessary for circulating exhaust gas, such as an exhaust pipe and a member that holds the exhaust pipe.
For example, it can be applied to a pipe or the like which has a configuration in which the entire pipe is accommodated in the internal space of the muffler 1 and is provided through a through hole of a separator. In addition, when the pipe is not inflated such as when the operation is stopped, there may be a gap between the main body and the insertion hole. Further, when the pipe is not inflated, the main body does not have to be press-fitted into the insertion hole.

(2b) A plurality of functions possessed by one component in the above embodiment may be realized by a plurality of components, or a function possessed by one component may be realized by a plurality of components. . Also, a plurality of functions possessed by a plurality of components may be realized by a single component, or a function realized by a plurality of components may be realized by a single component. Also, part of the configuration of the above embodiment may be omitted. Moreover, at least part of the configuration of the above embodiment may be added or replaced with respect to the configuration of the other above embodiment.

(2c) In addition to the muffler 1 described above, the present disclosure can also be implemented in various forms such as a system including the muffler 1 as a component. The relaxation portions 54A to 54I and 57A can be employed in any combination.

DESCRIPTION OF SYMBOLS 1... Muffler, 10... Internal space, 20... Outer shell member, 40... Inlet pipe, 45... Outlet pipe, 50, 50A, 50B, 50C, 50D, 50E, 50F, 50G, 50H, 50I, 50J... Separator, 51 ...main body portion 52...rising portion 53...burring portion 54A, 54B, 54C, 54D, 54E, 54F, 54G, 54H, 54I, 57A...relief portion 55A, 55B, 55C...second hole portion 56A, 56B, 56C... first hole, 57... edge.

Claims (7)

An exhaust unit comprising a plurality of parts,
A first member and a second member are provided as the plurality of parts,
The first member is
a main body configured in a plate shape;
and a cylindrical rising portion rising from the main body,
The second member is positioned in contact with the rising portion of the first member,
the rising portion is a relief portion that relieves the contact state between the first member and the second member;
Exhaust unit with. An exhaust unit according to claim 1, comprising:
The second member is configured as a pipe serving as an exhaust flow path,
The main body includes an insertion hole through which the second member is inserted,
The rising portion includes a burring portion surrounding the insertion hole and in contact with the pipe. An exhaust unit according to claim 1,
The second member is configured as a tubular member arranged to surround the main body,
The rising portion is arranged along the outer periphery of the main body portion and configured to contact the inner peripheral surface of the second member. An exhaust unit according to any one of claims 1 to 3,
In the exhaust unit, the relief portion is configured such that a rising height of a part of the rising portion is lower than a rising height of other portions of the rising portion. An exhaust unit according to claim 4,
The exhaust unit, wherein the relief portion includes a notch portion obtained by notching a portion of the rising portion in a height direction. The exhaust unit according to any one of claims 1 to 5,
The relief portion includes a notch portion having a shape obtained by notching a part of the rising portion,
The exhaust unit, wherein the cutout portion is configured such that the width of the cutout portion gradually narrows from the leading end of the rising portion toward the main body portion. An exhaust unit according to claim 6,
The relief portion is configured such that the notch portion extends to an area of the body portion.

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