JP2018115575A - Suppression member - Google Patents

Abstract

It is desirable to suppress sound emitted from a muffler. A restraining member is used for a muffler mounted on a vehicle and includes at least one restraining portion. At least one restraining part is an elongate site | part arrange | positioned on the outer surface of the outer shell member of a muffler. Here, in the outer shell member, a portion where the swing width due to vibration is the largest is defined as a belly. Further, a region where the antinode generated by the vibration of the outer shell member is located on the outer surface of the outer shell member is defined as an antinode region. Further, an antinode region due to resonance vibration generated in the outer shell member due to resonance is defined as a resonance antinode region. When the at least one suppressing portion is disposed on the outer surface of the outer shell member, the at least one suppressing portion is disposed along at least one resonance antinode region and is in contact with the at least one resonance antinode region. . [Selection] Figure 1

Description

  The present disclosure relates to a suppression member attached to a muffler of a vehicle.

  Radiation sound is emitted when vibration is generated in the muffler of the vehicle. On the other hand, Patent Document 1 describes that a radiated sound from a muffler is suppressed by providing a lock seam portion on a cylindrical shell covering the muffler. Specifically, the shell is formed by curving a rectangular metal thin plate and caulking and joining the portions forming two opposing sides of the thin plate. The lock seam portion is a joint portion of the thin plate. Then, the resonance of the shell is suppressed by adjusting the position of the lock seam portion and setting the natural frequency of the muffler to a value different from the frequency of the exhaust pulsation from the engine. Thereby, the radiation sound from a muffler is suppressed.

JP 2001-82125 A

However, for example, when the shell has low rigidity, there is a possibility that the radiated sound cannot be sufficiently suppressed even if the technique described in Patent Document 1 is used.
It is desirable to suppress radiated sound from the muffler.

  The suppression member which is one side of this indication is used for the muffler carried in vehicles, and is provided with at least one control part. At least one suppression part is an elongate site | part arrange | positioned on the outer surface of the outer shell member which is a plate-shaped member which separates the exterior and the inside of a muffler. Here, in the outer shell member in which vibration is generated, a portion where the swing width due to the vibration is the largest is defined as a belly. Further, a region where the antinode generated by the vibration of the outer shell member is located on the outer surface of the outer shell member is defined as an antinode region. Further, the vibration generated in the outer shell member by resonance is referred to as resonance vibration. The antinode region caused by the resonance vibration is set as the resonance antinode region. When the at least one suppressing portion is disposed on the outer surface of the outer shell member, the at least one suppressing portion is disposed along at least one resonance antinode region and is in contact with the at least one resonance antinode region. .

  According to such a configuration, the amplitude of resonance vibration that generates at least one resonance antinode region with which at least one suppression unit is in contact is suppressed. For this reason, the radiation sound from a muffler can be suppressed.

  The at least one suppressing portion that has come into contact is disposed along a plurality of resonance antinode regions caused by a plurality of resonance vibrations, and is in a state of being in contact with the plurality of resonance antinode regions. good.

According to such a configuration, the amplitude of a plurality of resonance vibrations is suppressed. For this reason, the radiation sound from a muffler can be suppressed further.
In addition, the at least one suppressing portion may have at least one muffler side convex portion that comes into contact with the resonance antinode region when being in the contact state.

  According to such a structure, the area of the area | region where at least 1 suppression part and the outer shell member of a muffler contact | abut can be reduced. For this reason, it can suppress that heat transfers from a muffler to at least 1 control part. As a result, it can suppress that at least 1 suppression part becomes high temperature.

  Further, when the at least one suppressing portion is brought into a contact state, the at least one muffler-side convex portion is caused by a vibration that is different from the resonance antinode region and the resonance vibration that generated the resonance antinode region. You may contact with.

According to such a configuration, it is possible to suppress the amplitude of more vibration generated in the outer shell member. For this reason, the radiation sound from a muffler can be suppressed further.
Further, the outer shell member may have a columnar shape extending in a predetermined extension direction. The at least one suppressing portion may be in contact with at least one resonance antinode region generated on the side surface of the outer shell member.

  The side surface of the outer shell member of the columnar muffler may have reduced rigidity. On the other hand, according to the said structure, the amplitude of the resonance vibration in the side surface of an outer shell member can be suppressed. For this reason, the radiation sound from a muffler can be suppressed effectively.

  Further, the outer shell member may have a shape extending in the longitudinal direction orthogonal or substantially orthogonal to the extending direction. And at least 1 suppression part may be in contact with the at least 1 resonance antinode area which arose in the area | region which spreads along the longitudinal direction in the side surface of an outer shell member.

  In the outer shell member of the muffler having the above-described shape, there is a risk that the portion that extends along the longitudinal direction may have reduced rigidity. On the other hand, according to the above configuration, the amplitude of resonance vibration in the portion can be suppressed. For this reason, the radiation sound from a muffler can be suppressed effectively.

  In addition, when the muffler is mounted on the vehicle, the region of the outer surface of the outer shell member that faces downward of the vehicle may be set as the lower region. The at least one suppressing portion may be in contact with at least one resonance antinode region generated in the lower region.

According to such a structure, the radiated sound which arises from the lower area | region of an outer shell member can be suppressed. For this reason, it is possible to suppress the sound emitted toward the outside of the vehicle.
Moreover, the at least 1 suppression part may have an attachment part to which the cover member which covers the muffler mounted in the vehicle from the lower side is attached.

According to such a configuration, it is possible to further improve the aerodynamic characteristics of the vehicle while suppressing the sound emitted from the muffler.
Moreover, the attaching part may have at least one cover member side convex part. And when a cover member is attached to an attachment part, at least 1 cover member side convex part may contact | abut to a cover member.

  According to such a structure, the area of the area | region contact | abutted with the cover member in at least 1 suppression part can be reduced. For this reason, it can suppress that heat transfers from a muffler to a cover member. As a result, it can suppress that a cover member becomes high temperature.

1A to 1C are a perspective view, a bottom view, and a side view, respectively, of a muffler to which a suppression member of the present embodiment is attached. 2A and 2B are a perspective view and a side view of a suppressing portion in the suppressing member of the present embodiment, respectively. FIG. 2C is an enlarged view of a muffler side convex portion in the suppressing portion. FIG. 2D is an enlarged view of the cover member side convex portion in the suppressing portion. 3A to 3D are a top view, a side view, a 3C-3C cross-sectional view, and a 3D-3D cross-sectional view, respectively, of the suppressing unit of the present embodiment. FIG. 4A is an explanatory diagram of resonance vibration generated in the muffler of the present embodiment. FIG. 4B is an explanatory diagram of a resonance antinode region generated in the side surface portion of the muffler. FIG. 5A is an explanatory diagram of vibration in the extending direction at the side surface portion of the muffler of the present embodiment. FIG. 5B is a graph showing the magnitude of sound emitted from the muffler to which the suppressing member of the present embodiment is attached and the muffler to which the suppressing member is not attached. 6A and 6B are a perspective view and a side view, respectively, of the suppressing portion of the first modification. 6C and 6D are a perspective view and a top view, respectively, of the suppressing portion of the second modification.

  Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. Embodiments of the present disclosure are not limited to the following embodiments, and various forms can be adopted as long as they belong to the technical scope of the present disclosure.

[About suppression member]
As shown in FIGS. 1A to 1C, the suppressing member 1 of the present embodiment is used for a muffler 2 mounted on a vehicle. The muffler 2 is disposed in an exhaust path for exhausting the exhaust of the vehicle engine to the outside of the vehicle. The exhaust flows down the muffler 2 and flows out of the vehicle. In the present embodiment, the suppressing member 1 is attached to the outer shell member 20 of the muffler 2. The outer shell member 20 is a plate-like member that separates the outside and the inside of the muffler. The outer shell member 20 covers the inner space of the muffler. Further, a cover member 3 that is a plate-like member is attached to the suppressing member 1. As shown in FIG. 1C, the cover member 3 covers the muffler 2 mounted on the bottom of the vehicle from the lower side in order to make the aerodynamic characteristics of the vehicle more suitable.

  The restraining member 1 has two elongated restraining portions 10. These suppressing portions 10 are arranged on the outer surface of the outer shell member 20. In addition, the suppressing member 1 may have one or three or more suppressing portions 10. As shown in FIGS. 2A to 3D, each suppressing portion 10 is a plate-like portion, and includes a groove portion 11 and two contact portions 15.

  The groove portion 11 is an elongated portion extending along the suppressing portion 10. Further, the groove portion 11 has an elongated groove extending along the groove portion 11. The groove part 11 has an attachment part 13 and two side parts 12. The attachment portion 13 is a portion that forms the bottom surface of the groove. Moreover, the two side parts 12 are the part which makes the side surface of a groove | channel, and face each other on both sides of a groove | channel.

  Here, in the suppressing part 10, the side where the bottom surface of the groove is located is the cover member side, and the side where the opening of the groove facing the bottom surface is located is the muffler side. Moreover, the edge part located in the muffler side in each side part 12 is made into a muffler side edge part. The muffler side edge extends from one end of the groove to the other end.

  The cover member 3 is attached to the attachment portion 13. The attachment portion 13 has at least one cover member side convex portion 14. In the present embodiment, as an example, the attachment portion 13 includes a plurality of cover member-side convex portions 14. The cover member side convex part 14 protrudes to the cover member side. Further, a circular hole portion 14 a penetrating the cover member side convex portion 14 is provided at the center of the cover member side convex portion 14.

  Further, each contact portion 15 is an elongated strip-shaped portion extending along the suppressing portion 10. Each contact portion 15 is provided at a muffler side edge portion of each side portion 12 of the groove portion 11. Specifically, each contact portion 15 protrudes from the muffler side edge portion to the outside of the groove.

  Each contact portion 15 has at least one muffler side convex portion 16. The muffler side convex part 16 protrudes to the muffler side. Specifically, each abutment portion 15 is provided with a plurality of muffler-side convex portions 16 arranged at intervals along the corresponding contact portion 15. Each muffler side convex portion 16 is provided in a quadrangular region extending from one end to the other end in the width direction of the contact portion 15. In addition, a circular hole 16 a penetrating the muffler side convex portion 16 is provided in the center of the muffler side convex portion 16.

[About the muffler]
As shown in FIGS. 1A to 1C, the outer shell member 20 of the muffler 2 of the present embodiment has a horizontally long shape as an example. Specifically, the outer shell member 20 has a columnar shape extending in a predetermined extension direction 2a. Furthermore, the outer shell member 20 has a shape extending in the longitudinal direction 2b orthogonal to or substantially orthogonal to the extending direction 2a. The muffler 2 is mounted on the vehicle such that the extending direction 2a and the longitudinal direction 2b are along the bottom of the vehicle. In other words, the muffler 2 is mounted on the bottom of the vehicle in a state of spreading in the lateral direction. The shape of the outer shell member 20 may be, for example, a columnar shape or a prismatic shape.

  Here, the two portions corresponding to the bottom surface of the outer shell member 20 are referred to as a first bottom surface portion 25 and a second bottom surface portion 26, respectively. The first and second bottom surface portions 25 and 26 face the extending direction 2a. As an example, the first and second bottom surface portions 25 and 26 have an elliptical shape. In addition, the 1st and 2nd bottom face parts 25 and 26 may be rectangular shape, for example. A portion corresponding to the side surface of the outer shell member 20 is referred to as a side surface portion 21. As an example, the side part 21 is comprised by the plate-shaped member arrange | positioned in single (it is hereafter described as a single structure). In addition, the side part 21 may be comprised by the plate-shaped member arrange | positioned doubly.

  In addition, at least one (for example, two) separator is provided in the inner space of the muffler 2. The at least one separator is a plate-like part that partitions the internal space of the muffler. The at least one separator has the same shape as the first and second bottom surface portions 25 and 26. Further, at least one separator is disposed toward the extending direction 2a. At this time, the separator is in contact with the inner surface of the side surface portion 21. Hereinafter, a region facing the edge of the separator 27 on the outer surface of the side surface portion 21 is referred to as a separator region. The separator region goes around the side portion 21.

  Here, during operation of the vehicle engine, vibrations may occur in the outer shell member 20 due to, for example, engine vibration and / or exhaust flow in the muffler 2. As an example, the vibration causes each position of the outer shell member 20 to sway in a direction orthogonal or substantially orthogonal to the outer surface of the outer shell member 20. Further, in the outer shell member 20 in which vibration of a predetermined frequency is generated, a portion where the swing width due to the vibration is the largest is an antinode. In other words, the antinode means a portion of the outer shell member 20 in which the vibration is generated that has the largest displacement due to the vibration. Further, when a vibration having a natural frequency in the outer shell member 20 is applied to the outer shell member 20, resonance occurs in the outer shell member 20. Hereinafter, vibration having a predetermined frequency generated in the outer shell member 20 due to resonance is referred to as resonance vibration.

  The side surface portion 21 of the outer shell member 20 is disposed in a state in which the inner space of the columnar muffler 2 is surrounded from the side. As shown in FIG. 4A, it is assumed that one or a plurality of resonance vibrations along the circumferential direction 2c occur in the side surface portion 21. As an example, the two resonance vibrations 50 and 51 in FIG. 4A are caused by the second-order mode resonance and the third-order mode resonance, respectively. And as shown to FIG. 4A and 4B, the area | regions 21a and 21b in which the antinodes of the resonant vibrations 50 and 51 are located are extended linearly along the extension direction 2a as an example. Hereinafter, the region where the antinode generated by the vibration of the predetermined frequency in the outer shell member 20 is located on the outer surface of the outer shell member 20 is defined as the antinode region. The antinode region caused by the resonance vibration is set as the resonance antinode region.

  The resonance antinode regions 21a and 21b generated by the resonance vibrations 50 and 51 are specified by performing an analysis or conducting an experiment based on the shape and rigidity of the outer shell member 20, for example. The position and number of the resonance antinode regions 21a and 21b are determined by the frequency of the resonance vibrations 50 and 51.

  Further, as shown in FIG. 5A, it is considered that vibrations 52 to 54 (hereinafter, vibrations in the extension direction) along the extension direction 2a occur in the side surface portion 21 in addition to the resonance vibration in the circumferential direction 2c. That is, a region located between two adjacent separators 27 exists on the outer surface of the side surface portion 21. In addition, a region located between the separator 27 and the first bottom surface portion 25 or the second bottom surface portion 26 adjacent to the separator 27 exists on the outer surface of the side surface portion 21. In each of these regions, it is considered that vibrations 52 to 54 in the extension direction 2a in which the antinodes are located in the center of the extension direction 2a of the region. The antinode region 21c of the vibrations 52 to 54 in the extending direction 2a is located at the center of the extending direction 2a of each region and extends in the longitudinal direction 2b. Further, the antinode region 21c of the vibrations 52 to 54 in the extending direction 2a has a portion overlapping the resonant antinode region.

[Disposition of restraining member]
Each suppressing portion 10 in the suppressing member 1 is disposed along at least one resonance antinode region on the outer surface of the outer shell member 20 and is in contact with the at least one resonance antinode region (hereinafter referred to as an abutting state). It becomes. When the contact state is established, each contact portion 15 of the suppressing unit 10 is disposed along the resonance antinode region and covers the resonance antinode region. At this time, each muffler-side convex portion 16 of each contact portion 15 is in contact with the resonant antinode region covered by the corresponding contact portion 15.

  Here, a region of the outer surface of the side surface portion 21 that faces downward of the vehicle when the muffler 2 is mounted on the vehicle is referred to as a lower region 22. Further, a region extending along the longitudinal direction 2 b on the outer surface of the side surface portion 21 is defined as a longitudinal region 23. The longitudinal region 23 is a flat region where the degree of curvature does not reach a certain level. Two longitudinal regions 23 exist on the outer surface of the side portion 21. These longitudinal regions 23 face each other in a direction orthogonal to the longitudinal direction 2b.

  In the present embodiment, as shown in FIG. 4B, as an example, each suppression unit 10 is generated in the longitudinal region 23 located in the lower region 22 on the outer surface of the side surface portion 21, and the two resonance antinode regions 21 a and 21 b are generated. And a contact state. The two resonance antinode regions 21a and 21b are generated by the secondary mode resonance and the tertiary mode resonance that occur in the circumferential direction 2c described above. That is, one contact portion 15 in each suppressing portion 10 covers the resonance antinode region 21a, and the other contact portion 15 covers the resonance antinode region 21b. At this time, the attachment portion 13 of each suppression portion 10 is in a state of facing downward of the vehicle.

  At this time, as shown in FIG. 5A, some of the muffler-side convex portions 16 in each contact portion 15 are in contact with the resonance antinode region and the antinode region 21c of the vibration in the extension direction 2a. Also good. Further, some of the muffler side convex portions 16 in each contact portion 15 may be in contact with the resonance antinode region and the separator region 21d. In particular, the muffler side convex portion 16 located at the end of each contact portion 15 is in contact with the resonance antinode region and the vibration antinode region 21c in the extending direction 2a or the separator region 21d. Also good. In addition, each muffler side convex portion 16 in each contact portion 15 may be in contact with the resonance antinode region and not in contact with the vibration antinode region 21c and the separator region 21d in the extension direction 2a. .

  In addition, each suppression part 10 may be in the contact | abutting state similarly to the at least 1 resonance antinode area produced in the area | region located in the upper side in the outer surface of the side part 21, for example. Thereby, the emitted sound of the muffler 2 which goes to the inside of a vehicle can be suppressed. Moreover, each suppression part 10 may be in contact with the at least one resonance antinode region generated in the region located at the end portion in the longitudinal direction 2b on the outer surface of the side surface portion 21, for example. Moreover, each suppression part 10 may be in the contact | abutting state similarly to the at least 1 resonance antinode area produced in the 1st or 2nd bottom face parts 25 and 26, for example.

  Moreover, the suppression part 10 may be in contact with two resonance antinode regions generated by resonance in a plurality of modes other than the secondary mode and the tertiary mode. The suppression unit 10 may be in contact with two resonance antinode regions generated by at least one of the secondary mode resonance and the third mode resonance and the resonance of the other mode. . Further, the suppressing unit 10 may be in contact with two resonance antinode regions generated by resonance in the same mode. Moreover, the suppression part 10 may be in contact with one resonance antinode region.

  Further, the cover member 3 is attached to each attachment portion 13 in each suppression portion 10. Specifically, the cover member 3 is disposed in a state of facing each attachment portion 13. At this time, at least one cover member side convex portion 14 in each attachment portion 13 is in contact with the cover member 3. And the cover member 3 is attached with a volt | bolt using the hole 14a provided in the cover member side convex part 14. FIG. In addition, the suppression member 1 may be used in the state which does not attach the cover member 3 to each suppression part 10. FIG.

[effect]
(1) According to the above embodiment, the amplitude of the resonance vibrations 50 and 51 that generate the resonance antinode regions 21a and 21b with which the respective suppression portions 10 of the suppression member 1 are in contact is suppressed. For this reason, the radiated sound from the muffler 2 can be suppressed.

  (2) It is considered that the resonance of the secondary mode and the tertiary mode in the side surface portion 21 greatly contributes to the radiated sound generated from the muffler 2. On the other hand, according to the embodiment, the amplitude of the two resonance vibrations 50 and 51 generated by the resonance of the side surface portion 21 in the secondary mode and the tertiary mode is suppressed. For this reason, the radiation sound from the muffler 2 can be further suppressed.

  Note that the graph in FIG. 5B shows the sound emitted from the muffler 2 in which the suppressing member 1 is used and the sound emitted from the muffler 2 in which the suppressing member 1 is not used. This graph shows the magnitude of the radiated sound generated from each muffler 2 according to the rotational speed of the engine of the vehicle. Further, the graph shows that the radiated sound from the muffler 2 is suppressed by using the suppressing member 1.

  (3) Each abutment portion 15 is provided with at least one muffler side convex portion 16. Thereby, the rigidity of each contact part 15 improves. Further, each suppressing portion 10 abuts on the outer shell member 20 of the muffler 2 by at least one muffler side convex portion 16. For this reason, the area of the area | region where each control part 10 and the outer shell member 20 contact | abut can be reduced. Thereby, it can suppress that heat transfers from the muffler 2 to each suppression part 10 and the cover member 3. FIG. As a result, it can suppress that the cover member 3 becomes high temperature.

  (4) Moreover, the at least 1 muffler side convex part 16 in each contact part 15 of the suppression part 10 will be in the state contact | abutted to the resonance antinode area | region and the antinode area 21c of the vibration of the extension direction 2a. For this reason, the amplitude of more vibrations generated in the outer shell member 20 can be suppressed. For this reason, the radiation sound from the muffler 2 can be further suppressed.

  (5) Moreover, the side part 21 of the muffler 2 may have a reduced rigidity. On the other hand, according to the above embodiment, the amplitude of resonance vibration in the side surface portion 21 can be suppressed. For this reason, the radiated sound from the muffler 2 can be effectively suppressed.

  Moreover, the suppression member 1 can be used for the side part 21 of a single structure or a double structure. The side surface portion of the double structure has higher rigidity than the side surface portion of the single structure, and can suppress radiated sound. However, when the side surface portion has a double structure, it is necessary to make the plate-like member constituting the side surface portion thinner than in the single structure. For this reason, a muffler having a side surface portion having a double structure becomes difficult to manufacture and increases in cost as compared with a muffler having a side surface portion having a single structure. On the other hand, the radiated sound from the side surface portion of the single structure can be suppressed by using each suppression portion 10 of the suppression member 1. For this reason, the muffler's radiated sound can be suppressed while suppressing the manufacturing cost of the muffler.

  (6) In addition, the longitudinal region 23 of the side surface portion 21 may be less rigid than other regions. On the other hand, according to the embodiment, the amplitude of resonance vibration in the longitudinal region 23 can be suppressed. For this reason, the radiated sound from the muffler 2 can be effectively suppressed.

  (7) Moreover, the radiated sound generated from the lower side of the outer shell member 20 is likely to leak to the outside of the vehicle. On the other hand, according to the above embodiment, the amplitude of resonance vibration in the lower region 22 in the side surface portion 21 can be suppressed. For this reason, the emitted sound which goes to the exterior of the vehicle from the muffler 2 can be suppressed effectively.

  (8) Moreover, the cover member 3 is attached to the attachment part 13 of each suppression part 10. For this reason, it is possible to further improve the aerodynamic characteristics of the vehicle while suppressing the sound emitted from the muffler 2.

  (9) Further, the attachment portion 13 is provided with at least one cover member side convex portion 14. Thereby, the rigidity of the attachment part 13 improves. Further, each suppressing portion 10 abuts on the cover member 3 with at least one cover member side convex portion 14. Thereby, the area of the area | region where each control part 10 and the cover member 3 contact | abut can be reduced. For this reason, it can suppress that heat is transmitted from the muffler 2 to the cover member 3. As a result, it can suppress that the cover member 3 becomes high temperature.

[Modification]
Next, a modification of the above embodiment will be described.
As shown in FIGS. 6A and 6B, in the suppressing portion 10 of the first modification, at least one hole portion 17 (as an example, a plurality of hole portions 17) penetrating the side portion 12 is provided in each side portion 12 of the groove portion 11. Is provided. As an example, in Modification 1, two hole portions 17 are provided on both sides of each cover member-side convex portion 14. Thereby, it can suppress that heat is transmitted from the muffler 2 to the cover member 3. As a result, it can suppress that the cover member 3 becomes high temperature.

  Moreover, as FIG. 6C and 6D show, in the suppression part 10 of the modification 2, the attachment part 13 of the groove part 11 is provided with at least one hole part 18 (as an example, a plurality of hole parts 18). ) Is provided. Each hole 18 is provided between two adjacent cover member side convex portions 14. Thereby, it can suppress that heat is transmitted from the muffler 2 to the cover member 3. In addition, a protrusion 18 a that protrudes toward the cover member is provided at the edge of each hole 18. The protrusion 18 a surrounds the hole 18. Thereby, the intensity | strength of a suppression part improves.

[Other Embodiments]
(1) In the above-described embodiment, the suppression unit 10 has two contact portions. However, the suppression part may have one or three or more contact parts similar to those in the above embodiment. And the suppression part may be in contact with the same number of resonance antinode regions as the contact part of the suppression part. Moreover, in the said embodiment, the control part 10 becomes a shape which has a groove | channel. However, the suppression unit may have a strip shape, for example. Moreover, the shape where the cross section orthogonal to the direction where the said suppression part extends is L-shaped may be sufficient as the suppression part, for example.

  (2) In the above embodiment, at least one muffler-side convex portion 16 is provided in each contact portion 15 in the suppressing portion 10. However, the muffler-side convex portion 16 may not be provided on all or a part of the contact portion 15 in the suppressing portion 10. Even in such a case, when the contact state is established, the contact portion of the suppressing portion may be brought into contact with the resonance antinode region, the vibration antinode region 21c in the extension direction 2a, and the separator region 21d. it can.

  (3) In the said embodiment, the attachment part 13 in the suppression part 10 is provided with the at least 1 cover member side convex part 14. As shown in FIG. However, the cover member side convex portion 14 may not be provided in the attachment portion 13. Even in such a case, the cover member 3 can be attached to the attachment portion 13.

  DESCRIPTION OF SYMBOLS 1 ... Suppression member, 2 ... Muffler, 3 ... Cover member, 10 ... Suppression part, 11 ... Groove part, 12 ... Side part, 13 ... Mounting part, 14 ... Cover member side convex part, 15 ... Contact part, 16 ... Muffler Side convex part, 20 ... outer shell member, 21 ... side part, 21a, 21b ... resonance abdominal area, 21c ... abdominal area, 22 ... lower side area, 23 ... longitudinal area, 25 ... first bottom face part, 26 ... second Bottom surface portion, 27... Separator, 50, 51... Resonance vibration, 52 to 54.

Claims (9)

A restraining member used in a muffler mounted on a vehicle,
Comprising at least one elongate restraining portion disposed on the outer surface of the outer shell member which is a plate-like member separating the outside and the inside of the muffler;
In the outer shell member in which vibration is generated, a portion where the swing width due to the vibration is the largest is a belly,
On the outer surface of the outer shell member, a region where the antinode generated by the vibration of the outer shell member is located as an antinode region,
The vibration generated in the outer shell member by resonance is referred to as resonance vibration,
The antinode region caused by the resonance vibration is a resonance antinode region,
The at least one restraining portion is disposed along the at least one resonance antinode region and disposed in contact with the at least one resonance antinode region when disposed on the outer surface of the outer shell member. The suppression member. The suppressing member according to claim 1,
The at least one suppressing portion that is in the contact state is disposed along the plurality of resonance antinode regions caused by the plurality of resonance vibrations and is in contact with the plurality of resonance antinode regions. Suppression member. In the suppression member described in Claim 1 or Claim 2,
The said at least 1 suppression part has at least 1 muffler side convex part which contact | abuts to the said resonance antinode area when it will be in the said contact state. The suppressing member according to claim 3,
When the at least one suppressing portion is brought into the contact state, the at least one muffler side convex portion is generated by vibrations different from the resonance antinode region and the resonance vibration that generated the resonance antinode region. A restraining member that contacts the abdominal region. In the suppressing member according to any one of claims 1 to 4,
The outer shell member has a columnar shape extending in a predetermined extension direction,
The at least one suppressing portion is in a contact state with the at least one resonance antinode region generated on a side surface of the outer shell member. In the restraining member according to claim 5,
The outer shell member has a shape extending in a longitudinal direction orthogonal or substantially orthogonal to the extension direction,
The at least one suppressing portion is in a contact state with the at least one resonance antinode region generated in a region extending along the longitudinal direction on a side surface of the outer shell member. The suppressing member according to any one of claims 1 to 6,
When the muffler is mounted on the vehicle, the region of the outer surface of the outer shell member that faces downward of the vehicle is defined as a lower region,
The at least one suppressing portion is in a contact state with the at least one resonance antinode region generated in the lower region. The suppressing member according to claim 7,
The at least one restraining portion has a mounting portion to which a cover member that covers the muffler mounted on the vehicle from below is attached. The suppressing member according to claim 8,
The attachment portion has at least one cover member side convex portion,
The restraining member, wherein when the cover member is attached to the attachment portion, the at least one cover member-side convex portion comes into contact with the cover member.

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