Cover member

Abstract

To enable downsizing a cover member for covering an exhaust member.SOLUTION: A cover member comprises a first peripheral end part, a second peripheral end part, and a caulking part. The first peripheral end part and the second peripheral end part extend along a flow direction, and form an end part in a revolving direction. The second peripheral end part is arranged by abutting on the first peripheral end part. The caulking part caulks a part of the cover member so as to couple the first peripheral end part with the second peripheral end part. The cover member is arranged so that a first region at a first peripheral end part side, and a second region at a second peripheral end part side are overlapped in a thickness direction. A first hole portion is formed in the first region, and a second hole portion is formed in the second region, and the first hole portion and the second hole portion are arranged so that at least parts of them are overlapped.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a cover member that covers an exhaust member. [Background technology]

[0002] For example, the following Patent Document 1 discloses a cover member configured to sandwich from above and below an exhaust member configured as an exhaust pipe and a heat insulating material arranged so as to surround the outer circumferential surface of the exhaust member. This cover member is divided into an upper member and a lower member, and the upper member and the lower member are fixed to the exhaust member by fastening members fastened with bolts and nuts. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Utility Model Application Publication No. 53-068825 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the configuration of Patent Document 1 above requires space for arranging the fastening members, which makes it difficult to reduce the size of the cover member. One aspect of the present disclosure is to enable a cover member that covers an exhaust member to be made smaller. [Means for solving the problem]

[0005] One aspect of the present disclosure is a cover member that covers a cylindrical exhaust member through which exhaust gas flows. The cover member is arranged to go around the outer periphery of a buffer member that is arranged to go around the outer periphery of the exhaust member. The direction in which the exhaust gas flows is referred to as the flow direction, and the direction in which the exhaust gas goes around the outer periphery of the exhaust member is referred to as the circumferential direction.

[0006] The cover member includes a first circumferential end, a second circumferential end, and a crimping portion. The first circumferential end extends along the flow direction and forms an end in the circumferential direction. The second circumferential end extends along the flow direction and forms an end in the circumferential direction and is disposed abutting against the first circumferential end. The crimping portion joins the first circumferential end and the second circumferential end by crimping a portion of the cover member.

[0007] The cover member is arranged such that a first region on the first peripheral end side and a second region on the second peripheral end side overlap in the thickness direction. A first hole portion is formed in the first region, and a second hole portion is formed in the second region, and the first hole portion and the second hole portion are arranged to at least partially overlap.

[0008] With this configuration, the first and second peripheral ends can be positioned using the first and second holes, and can be securely fixed by the crimping portion. In this case, the crimping portion does not require space for arranging fastening members such as bolts and nuts, so the cover member can be made smaller.

[0009] One aspect of the present disclosure may further include a first member and a second member. The first member covers a portion of the buffer member in the circumferential direction, includes a first region, and has a first circumferential end and a first hole. The second member covers the remaining portion of the buffer member in the circumferential direction, and is connected to the first member at least at the crimped portion. The second member also includes a second region, and has a second circumferential end and a second hole. The first member and the second member may be formed to have an arc-shaped cross section perpendicular to the flow direction. According to this configuration, since the cover member is structured to be divided into a plurality of members including the first member and the second member, it is possible to easily arrange the cover member so as to surround the exhaust member.

[0010] In one aspect of the present disclosure, at least one of the first hole portion and the second hole portion may be formed as a long hole extending in a direction that moves the second circumferential end portion relative to the first circumferential end portion when the first circumferential end portion and the second circumferential end portion are butted together. According to this configuration, the first circumferential end portion and the second circumferential end portion can be positioned by butting the first circumferential end portion against the second circumferential end portion.

[0011] An aspect of the present disclosure may further include an extension portion and a crimping slit portion. The extension portion is configured to extend from one of the first circumferential end portion and the second circumferential end portion along the circumferential direction. The crimping slit portion is disposed on the other of the first circumferential end portion and the second circumferential end portion, and the extension portion is inserted through the crimping slit portion. According to this configuration, by inserting the extension portion into the crimping slit portion, the first peripheral end portion and the second peripheral end portion can be positioned so as not to be separated from each other.

[0012] In one aspect of the present disclosure, the crimping portion may be formed by bending an extension portion inserted into the crimping slit portion. According to this configuration, the first circumferential end portion and the second circumferential end portion can be fixed together by using the crimping slit portion.

[0013] In one aspect of the present disclosure, the second region may be configured to extend from the second circumferential end along the circumferential direction. A positioning slit through which the second region is inserted may be provided on the first circumferential end side of the cover member.

[0014] According to this configuration, the first peripheral end portion and the second peripheral end portion can be positioned by using the positioning slit portion. [Brief description of the drawings]

[0015] [Figure 1] FIG. 2 is a perspective view showing an exhaust unit according to the embodiment. [Diagram 2] FIG. 2 is an exploded perspective view showing the exhaust unit. [Diagram 3] 3A is an enlarged perspective view showing a slit portion, FIG. 3B is an enlarged perspective view showing a hole portion, and FIG. 3C is an enlarged perspective view showing a state in which an extension portion is inserted into the slit portion. [Figure 4]FIG. 4A is an enlarged perspective view showing the extending portion folded once, FIG. 4B is an enlarged perspective view showing the extending portion folded twice, and FIG. 4C is an enlarged perspective view showing the extending portion folded three times. [Diagram 5] FIG. 5A is a plan view showing a hole of a first modified example, and FIG. 5B is a plan view showing a hole of a second modified example. [Figure 6] FIG. 11 is a side cross-sectional view showing an exhaust unit of a second modified example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. [1. Embodiment] [1-1. Configuration] The exhaust unit 1A shown in Fig. 1 is a component that constitutes a part of a flow path for passing exhaust from an internal combustion engine mounted on a vehicle. As shown in Fig. 1 and Fig. 2, the exhaust unit 1A includes an exhaust member 3, a cover member 10A, and a buffer member 5. Note that Fig. 2 illustrates the inside of the exhaust unit 1A through the exhaust member 3.

[0017] The exhaust member 3 is a tubular member through which the exhaust flows. For example, the exhaust member 3 is a substantially cylindrical exhaust pipe made of metal. In the following description, the direction in which the exhaust flows in the exhaust member 3 is referred to as the flow direction, the direction in which the exhaust flows around the outer circumferential surface of the exhaust member 3 is referred to as the circumferential direction, and the direction of any imaginary line that is perpendicular to the flow direction and passes through the central axis P of the exhaust member 3 is referred to as the thickness direction or radial direction.

[0018] 2, the exhaust member 3 includes a large diameter portion 3A and two connection portions 3B. The large diameter portion 3A is a portion of the exhaust member 3 that is set to have a relatively large diameter. For example, a catalyst 7 is housed inside the large diameter portion 3A. The diameter is the distance from the central axis P to the inner or outer circumferential surface of a member (for example, the exhaust member 3).

[0019] The two connection parts 3B are disposed on either side of the large diameter part 3A in the flow direction so as to sandwich the large diameter part 3A. The two connection parts 3B have a tapered shape in which the diameter becomes smaller as it goes away from the large diameter part 3A.

[0020] The cover member 10A is a cylindrical member arranged so as to surround the outer peripheral surface of the exhaust member 3 while leaving a gap between the cover member 10A and the outer peripheral surface of the exhaust member 3. That is, the cover member 10A is arranged so as to cover the outer peripheral surface of the exhaust member 3. For example, the cover member 10A has a substantially cylindrical shape, and the central axis of the cover member 10A coincides with the central axis P of the exhaust member 3. The extension direction of the central axis P of the exhaust member 3 coincides with the flow direction.

[0021] The buffer member 5 is disposed between the outer peripheral surface of the exhaust member 3 and the inner peripheral surface of the cover member 10A, and functions as a heat insulating material. The buffer member 5 is a member having cushioning properties, that is, a member that generates a repulsive force when its thickness changes. For example, glass wool, metal wire mesh, etc. are used as the material for the buffer member 5. The buffer member 5 has a function of maintaining a temperature at which the catalyst 7 can operate.

[0022] The cushioning member 5 may have a function of suppressing abnormal noises due to vibrations of the cover member 10A and interference between the exhaust member 3 and the cover member 10A. In this way, the cushioning member 5 has any one of the functions of heat retention, insulation, and vibration damping. The cushioning member 5 is configured in a ring shape that covers the entire circumferential direction of the large diameter portion 3A and the two connection portions 3B in the gap between the exhaust member 3 and the cover member 10A. However, as shown in FIG. 2, the cushioning member 5 is configured by being divided into a first cushioning member 5A and a second cushioning member 5B. The first cushioning member 5A has a shape generally similar to that of a first member 30 described later, and the second cushioning member 5B has a shape generally similar to that of a second member 50 described later.

[0023] The cover member 10A is an insulator configured to block heat or noise generated when high-temperature exhaust gas passes through the exhaust member 3. The cover member 10A is made of a metal material such as stainless steel or aluminum.

[0024] Cover member 10A is disposed along the outer circumferential surface of exhaust member 3, and therefore has the same shape as exhaust member 3. That is, as shown in Fig. 1, cover member 10A includes large diameter portion 11A and two connection portions 11B. Large diameter portion 11A is a portion set to have a relatively large diameter.

[0025] The two connection parts 11B are disposed on either side of the large diameter part 11A in the flow direction so as to sandwich the large diameter part 11A. The two connection parts 11B have a tapered shape in which the diameter becomes smaller as it gets farther away from the large diameter part 11A.

[0026] In cover member 10A configured in this manner, parts of the inner diameter of two connection portions 11B are configured to be smaller than the outer diameter of large diameter portion 3A of exhaust member 3. This makes it possible to suppress movement of cover member 10A in the flow direction.

[0027] 1, the cover member 10A further includes a plurality of crimping portions 71. The crimping portions 71 are portions for crimping a portion of the cover member 10A to join the first circumferential end portion 31 and the second circumferential end portion 51, which are circumferential ends of the cover member 10A. The crimping portions 71 will be described in detail later.

[0028] 1 and 2, the cover member 10A includes a first member 30 and a second member 50. The first member 30 and the second member 50 are disposed to face each other and sandwich the exhaust member 3. The first member 30 covers a portion of the buffer member 5 in the circumferential direction. The second member 50 covers the remaining portion of the buffer member 5 in the circumferential direction except for the portion covered by the first member 30.

[0029] More specifically, in this embodiment, the first member 30 extends over about 180° in the circumferential direction and covers the upper part of the outer circumferential surface of the exhaust member 3. The second member 50 is located below the first member 30, extends over about 180° in the circumferential direction, and covers the lower part of the outer circumferential surface of the exhaust member 3. That is, the first member 30 and the second member 50 are each formed to have an arc-shaped cross section perpendicular to the flow direction. As shown in FIG. 1, the cover member 10A is manufactured by connecting the first member 30 and the second member 50. That is, the first member 30 and the second member 50, each having a semicircular cross section perpendicular to the flow direction, are arranged to face each other to form the cylindrical cover member 10A. As a result, a space is formed inside the cover member 10 to accommodate the exhaust member 3 covered with the buffer member 5.

[0030] As shown in Fig. 2, the first member 30 has a first circumferential end 31 and a plurality of first regions 32. The first circumferential end 31 extends along the flow direction so as to connect both ends of the first member 30 in the flow direction, and is a portion that forms an end of the first member 30 in the circumferential direction. The plurality of first regions 32 are formed in a planar shape. The first member 30 further has a plurality of crimping base portions 34 and positioning base portions 36 along the first circumferential end 31.

[0031] The first peripheral end 31 and the second peripheral end 51 described later are portions that are butted together when the first member 30 and the second member 50 are assembled, in other words, portions that are joined. In Figures 1 and 2 and the like, the first peripheral end 31 and the second peripheral end 51 are shown on the front side of the page, but similar first peripheral end 31 and second peripheral end 51 (not shown) are also present on the rear side of the page. In order to connect the first peripheral end 31 and the second peripheral end 51 on the rear side of the page as well, a configuration similar to that described later can be adopted.

[0032] Each of the first regions 32 is a region provided near the first peripheral end portion 31 of the first member 30, and is a region in which a corresponding one of a plurality of second regions 52 described below is arranged to overlap in the thickness direction. Each of the second regions 52 is formed in a planar shape similar to the first region 32 so as to be in good proximity to the first region 32. A first hole portion 32H is formed in each of the plurality of first regions 32.

[0033] As shown in FIG. 3A, the multiple crimping base portions 34 and the multiple positioning base portions 36 are configured to protrude in the thickness direction (lower right direction in FIG. 3A) from the outer peripheral surface of the first member 30. The multiple crimping base portions 34 are each formed with a crimping slit portion 33 penetrating the multiple crimping base portions 34 in the circumferential direction. The crimping base portions 34 are located, for example, on both sides of the first region 32 in the flow direction, but are not limited to this. The crimping base portions 34 (crimping slit portion 33) may be formed in the connecting portion 11B. Note that FIG. 3A is an enlarged view of region A in FIG. 1. The positioning base portion 36 is formed with a positioning slit portion 35 penetrating the positioning base portion 36 in the circumferential direction. The positioning base portion 36 and the first region 32 are arranged side by side in the circumferential direction. The positioning base portion 36 (positioning slit portion 35) may be formed in the connecting portion 11B.

[0034] As shown in FIG. 2, the second member 50 has a second circumferential end 51. The second circumferential end 51 extends along the flow direction so as to connect both ends of the second member 50 in the flow direction, and is a portion that forms an end of the second member 50 in the circumferential direction. The second member 50 further has a plurality of second regions 52 and a plurality of extensions 53 along the second circumferential end 51. A second hole portion 52H is formed in each of the plurality of second regions 52. The plurality of second regions 52 and the plurality of extensions 53 are portions that are configured to extend from the second circumferential end 51 along the circumferential direction. The second region 52 and the extensions 53 may be formed in the connection portion 11B.

[0035] 3B, the first hole 32H is formed as a long hole extending in a first direction. The first direction coincides with the direction in which the second circumferential end 51 is moved relative to the first circumferential end 31 when the first circumferential end 31 and the second circumferential end 51 are butted against each other, and in this embodiment, the first direction is set to coincide with the circumferential direction (in other words, the tangential direction) of the first circumferential end 31 and the second circumferential end 51.

[0036] Specifically, the first hole portion 32H is configured so that the length L in the circumferential direction is longer than the length D1 in the flow direction. The difference between the length L in the circumferential direction and the length D1 in the flow direction is set to be, for example, equal to or less than the thickness of the buffer member 5 and equal to or more than half the thickness of the buffer member 5. On the other hand, the second hole portion 52H is formed as a circular hole with a diameter D2. D1 and D2 are set to be the same. However, D1 and D2 do not have to be the same.

[0037] [1-2. Connection procedure] Next, a procedure for connecting the first member 30 and the second member 50 in the cover member 10A will be described with reference to Figs. 3C and 4A to 4C.

[0038] 3C, when connecting the first member 30 and the second member 50, first, all the second regions 52 are inserted into the corresponding positioning slit portions 35, and all the extension portions 53 are inserted into the corresponding crimping slit portions 33. Then, the first region 32 on the first circumferential end portion 31 side and the second region 52 on the second circumferential end portion 51 side are arranged to overlap in the thickness direction.

[0039] At this time, pressure is applied so that the first member 30 and the second member 50 approach each other to the extent that the cushioning member 5 is compressed and a repulsive force is generated. When pressure is applied in this manner, the first hole portion 32H and the second hole portion 52H are set to at least partially overlap each other.

[0040] With the first hole 32H and the second hole 52H at least partially overlapping in this manner, a pin (not shown) is inserted into each of the holes 32H, 52H so as to penetrate each of the holes 32H, 52H. The pin is configured to have an outer diameter slightly smaller than the diameter D2 of the second hole 52H.

[0041] Since the first hole 32H is formed as an elongated hole, slight misalignment is permitted and the pin can be inserted smoothly. Also, the pin may be inserted into all of the holes 32H, 52H, or into some of the holes 32H, 52H.

[0042] When the pressure applied to bring the first member 30 and the second member 50 closer together is stopped with the pin inserted, the first member 30 and the second member 50 move in a direction away from each other due to the repulsive force of the cushioning member 5 that is being pressed and tries to restore its original shape. At this time, the pin abuts against the lower end of the first hole portion 32H, which is an elongated hole, and also abuts against the upper end of the circular second hole portion 52H. In this way, the first member 30 and the second member 50 are positioned by the pin.

[0043] When the first member 30 and the second member 50 are positioned by the pins, the buffer member 5 does not completely return to its original state, and part of the repulsive force of the buffer member 5 remains. This makes it easier to generate frictional resistance between the buffer member 5 and the exhaust member 3, and between the buffer member 5 and the cover member 10A, so that the buffer member 5 is configured to be less likely to move between the exhaust member 3 and the cover member 10A.

[0044] Next, with the pins inserted in this manner, as shown in Figs. 4A to 4C, all of the extensions 53 inserted into the crimping slits 33 are sequentially bent. First, as shown in Fig. 4A, the extensions 53 extending in the circumferential direction are bent outward in the thickness direction by about 90°, and then, as shown in Fig. 4B, the extensions 53 are bent again by about 90° in the opposite direction to the circumferential direction (i.e., the opposite direction to the direction in which the extensions 53 are inserted into the crimping slits 33). Furthermore, as shown in Fig. 4C, the extensions 53 are bent outward in the thickness direction. In this manner, the extensions 53 are bent in three stages so that they are wrapped around the crimping base 34, thereby forming the crimping portion 71. The second region 52 inserted into the positioning slit 35 is not bent.

[0045] Thereafter, the pins inserted into the holes 32H and 52H are removed, and the connection between the first member 30 and the second member 50 is completed.

[0046] [1-3. Effects] According to the first embodiment described above in detail, the following effects are achieved.

[0047] (1a) A cover member 10A according to one embodiment of the present disclosure includes a first circumferential end portion 31, a second circumferential end portion 51, and a crimped portion 71. The first circumferential end portion 31 extends along the flow direction and forms an end portion in the circumferential direction. The second circumferential end portion 51 extends along the flow direction and forms an end portion in the circumferential direction. The second circumferential end portion 51 is disposed in abutment with the first circumferential end portion 31. The crimped portion 71 joins the first circumferential end portion 31 and the second circumferential end portion 51 by crimping a portion of the cover member 10A.

[0048] The cover member 10A is disposed such that the first region 32 on the first circumferential end 31 side and the second region 52 on the second circumferential end 51 side overlap in the thickness direction. A first hole portion 32H is formed in the first region 32, and a second hole portion 52H is formed in the second region 52, and the first hole portion 32H and the second hole portion 52H are disposed such that they at least partially overlap.

[0049] According to this configuration, the first peripheral end 31 and the second peripheral end 51 can be positioned using the first hole portion 32H and the second hole portion 52H, while the cover member 10A can be satisfactorily fixed by the crimping portion 71. At this time, the crimping portion 71 does not require space for arranging fastening members such as bolts and nuts, so the cover member 10A can be made smaller. In addition, when positioning the first peripheral end 31 and the second peripheral end 51, the hole positions are set so that the force that the cushioning member 5 tries to restore when compressed, that is, the repulsive force, becomes appropriate. As a result, the movement of the cushioning member 5 after the crimping portion 71 is formed can be suppressed by the above-mentioned friction resistance. In addition, in a configuration using the crimping portion 71 without using a fastening member, an increase in the number of components can be suppressed, and an increase in the mass of the entire cover member 10A can be suppressed.

[0050] (1b) One aspect of the present disclosure further includes a first member 30 and a second member 50. The first member 30 covers a portion of the buffer member 5 in the circumferential direction, includes a first region 32, and has a first circumferential end 31 and a first hole 32H. The second member 50 covers the remaining portion of the buffer member 5 in the circumferential direction, and is connected to the first member 30 at at least a crimped portion 71. The second member 50 also includes a second region 52, and has a second circumferential end 51 and a second hole 52H. The first member 30 and the second member 50 are formed to have an arc-shaped cross section perpendicular to the flow direction. According to this configuration, since the cover member 10A is structured to be divided into a plurality of members including the first member 30 and the second member 50, it is possible to easily arrange the cover member 10A so as to surround the exhaust member 3.

[0051] (1c) In one embodiment of the present disclosure, at least one of the first hole portion 32H and the second hole portion 52H is formed as a long hole extending in a first direction. The first direction is configured to coincide with a direction in which the second circumferential end portion 51 is moved relative to the first circumferential end portion 31 when the first circumferential end portion 31 and the second circumferential end portion 51 are butted against each other.

[0052] According to such a configuration, the first circumferential end portion 31 and the second circumferential end portion 51 can be positioned by butting the first circumferential end portion 31 and the second circumferential end portion 51 against each other.

[0053] (1d) One embodiment of the present disclosure further includes an extension portion 53 and a crimping slit portion 33. The extension portion 53 is configured to extend in the circumferential direction from one of the first circumferential end portion 31 and the second circumferential end portion 51. The crimping slit portion 33 is disposed on the other side of the first circumferential end portion 31 and the second circumferential end portion 51, and the extension portion 53 is inserted therethrough. According to this configuration, by inserting the extension portion 53 into the crimping slit portion 33, the first peripheral end portion 31 and the second peripheral end portion 51 can be positioned so as not to be separated from each other.

[0054] (1e) In one aspect of the present disclosure, the crimped portion 71 is formed by bending the extension portion 53 inserted into the crimped slit portion 33 . According to this configuration, the first circumferential end portion 31 and the second circumferential end portion 51 can be fixed together using the crimping slit portion 33 .

[0055] (1f) In one embodiment of the present disclosure, the second region 52 is configured to extend in the circumferential direction from the second circumferential end 51. The cover member 10A is provided on the first circumferential end 31 side with a positioning slit portion 35 through which the second region 52 is inserted. According to this configuration, the first peripheral end portion 31 and the second peripheral end portion 51 can be positioned using the positioning slit portions 35 . By configuring the connection portion 11B to be crimped, even if a force is generated that shifts the cover member 10A in the flow direction, the connection portion 11B extends in a direction intersecting the flow direction, so that the shift of the cover member 10A in the flow direction can be suppressed.

[0056] 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 can be implemented in various modified forms.

[0057] (2a) In the above embodiment, the first hole 32H is configured as an elongated hole, but is not limited thereto. For example, the second hole 52H may be configured as an elongated hole, and the first hole 32H may have any shape. The shape of the holes 32H, 52H may be, for example, a rectangular hole 32J as shown in the first modified example of FIG. 5A, or a composite hole 32K combining a plurality of curved lines and a plurality of straight lines as shown in the second modified example of FIG. 5B. In particular, in the composite hole 32K shown in FIG. 5B, the assembly direction of the exhaust member 3C and the second member 50B is taken into consideration. For example, in the exhaust unit 1B of the second modified example shown in FIG. 6, the exhaust member 3C is provided with a protrusion such as a drain pipe 3P and a sensor boss (not shown). In such a case, the exhaust member 3C and the second member 50 are assembled in a state in which the protrusion is inserted into the through hole 50C provided in the second member 50B. At this time, the second member 50 is moved along the assembly direction indicated by the arrow, that is, along the protruding direction of the pipe 3P, and then moved so as to approach the first member 30.

[0058] That is, the movement direction when the exhaust member 3C and the second member 50 are assembled is different from the direction in which the first member 30 and the second member 50 approach each other. In such a case, as shown in FIG. 5B, it is preferable to form the hole 32K so that the direction along both of these trajectories is long, taking into consideration both of these trajectories. According to this configuration, the hole 32K is formed in consideration of the two directions when the second member 50B is assembled to the exhaust member 3C and the first member 30, so that the pin can be easily inserted when the cover member 10B is assembled.

[0059] (2b) In the above embodiment, the crimping slit portion 33 is formed in the first member 30 and the extension portion 53 is provided in the second member 50, but these may be reversed, with the crimping slit portion 33 being formed in the second member 50 and the extension portion 53 being provided in the first member 30.

[0060] (2c) In the above embodiment, the positioning slit portion 35 is formed in the first member 30 and the second region 52 is provided in the second member 50, but these may be reversed, with the positioning slit portion 35 being formed in the second member 50 and the second region 52 being provided in the first member 30.

[0061] (2d) In the above embodiment, the cover member 10A is composed of two members, the first member 30 and the second member 50, but it may be composed of a combination of three or more members, or may be composed of only one member. When the cover member 10A is composed of only one member, the cover member 10A is configured to have flexibility, and the cover member 10A having one each of the first peripheral end portion 31 and the second peripheral end portion 51 is prepared. Then, the cover member 10A and the exhaust member 3 are assembled in the following procedure. For example, the first peripheral end portion 31 and the second peripheral end portion 51 are pushed apart, and the exhaust member 3 is inserted into the inner peripheral surface side of the cover member 10A through this gap. Then, the first peripheral end portion 31 and the second peripheral end portion 51 are connected in the same procedure as above.

[0062] (2e) Multiple functions possessed by one component in the above embodiments may be realized by multiple components, or one function possessed by one component may be realized by multiple components. Also, multiple functions possessed by multiple components may be realized by one component, or one function realized by multiple components may be realized by one component. Also, part of the configuration of the above embodiments may be omitted. Also, at least part of the configuration of the above embodiments may be added to or substituted for the configuration of another of the above embodiments.

[0063] (2f) In addition to the exhaust units 1A and 1B described above, the present disclosure can also be realized in various forms, such as a system including the exhaust units 1A and 1B as components, a cover member 10A, and the like.

[0064] [Technical idea disclosed in this specification] [Item 1] A cover member that covers a cylindrical exhaust member through which exhaust gas flows, the cover member is disposed so as to go around the outer periphery of the buffer member disposed so as to go around the outer periphery of the exhaust member, The direction in which the exhaust gas flows is defined as a flow direction, the direction in which the exhaust gas flows around the outer circumferential surface of the exhaust member is defined as a circumferential direction, and the direction of an arbitrary imaginary line that is perpendicular to the flow direction and passes through the central axis of the exhaust member is defined as a thickness direction, The cover member is A first circumferential end portion extending along the flow direction and forming an end portion in the circumferential direction; A second circumferential end portion that extends along the flow direction and forms an end portion in the circumferential direction and is disposed to abut against the first circumferential end portion; a crimping portion that joins the first peripheral end portion and the second peripheral end portion by crimping a portion of the cover member; Equipped with The cover member is disposed such that a first region on the first peripheral end side and a second region on the second peripheral end side overlap in the thickness direction, A first hole portion is formed in the first region, and a second hole portion is formed in the second region, and the first hole portion and the second hole portion are arranged to at least partially overlap each other. Cover member. [Item 2] The cover member according to item 1, a first member covering a portion of the cushioning member in the circumferential direction, the first member including the first region and in which the first peripheral end portion and the first hole portion are formed; a second member covering a remaining portion of the buffer member in the circumferential direction and connected to the first member at least at the crimped portion, the second member including the second region and in which the second circumferential end portion and the second hole portion are formed; Further equipped with The first member and the second member are cover members each having an arc-shaped cross section perpendicular to the flow direction. [Item 3] The cover member according to item 1 or 2, At least one of the first hole portion and the second hole portion is formed as a long hole extending in a direction in which the second circumferential end portion moves relative to the first circumferential end portion when the first circumferential end portion and the second circumferential end portion are butted together. A cover member configured as above. [Item 4] A cover member according to any one of items 1 to 3, an extension portion configured to extend from one of the first circumferential end portion and the second circumferential end portion along the circumferential direction; a crimping slit portion disposed on the other of the first circumferential end portion and the second circumferential end portion and through which the extension portion is inserted; The cover member further comprises: [Item 5] The cover member according to item 4, The crimping portion is formed by bending an extension portion inserted into the crimping slit portion. Cover member. [Item 6] A cover member according to any one of items 1 to 5, The second region is configured to extend from the second circumferential end along the circumferential direction, The cover member is provided on the first peripheral end side with a crimping slit portion through which the second region is inserted. Cover member. [Explanation of symbols]

[0065] 1A, 1B...exhaust unit, 3, 3C...exhaust member, 5...buffer member, 7...catalyst, 10A, 10B...cover member, 30...first member, 31...first circumferential end, 32...first region, 32H...first hole portion, 33...crimping slit portion, 34...crimping base portion, 35...positioning slit portion, 36...positioning base portion, 50, 50B...second member, 51...second circumferential end, 52...second region, 52H...second hole portion, 53...extension portion, 71...crimping portion.

Claims

1. A cover member that covers a cylindrical exhaust member through which exhaust gas flows, the cover member is disposed so as to go around the outer periphery of the buffer member disposed so as to go around the outer periphery of the exhaust member, The direction in which the exhaust gas flows is defined as a flow direction, the direction in which the exhaust gas flows around the outer circumferential surface of the exhaust member is defined as a circumferential direction, and the direction of an arbitrary imaginary line that is perpendicular to the flow direction and passes through the central axis of the exhaust member is defined as a thickness direction. The cover member is A first circumferential end portion extending along the flow direction and forming an end portion in the circumferential direction; a second circumferential end portion extending along the flow direction and forming an end portion in the circumferential direction, the second circumferential end portion being disposed in abutment with the first circumferential end portion; a crimping portion that joins the first peripheral end portion and the second peripheral end portion by crimping a portion of the cover member; Equipped with The cover member is disposed such that a first region on the first peripheral end side and a second region on the second peripheral end side overlap in the thickness direction, A first hole portion is formed in the first region, and a second hole portion is formed in the second region, and the first hole portion and the second hole portion are arranged to at least partially overlap each other. Cover member.

2. The cover member according to claim 1, a first member covering a portion of the cushioning member in the circumferential direction, the first member including the first region and in which the first peripheral end portion and the first hole portion are formed; a second member covering a remaining portion of the buffer member in the circumferential direction and connected to the first member at least at the crimped portion, the second member including the second region and in which the second circumferential end portion and the second hole portion are formed; Further equipped with The first member and the second member are cover members each having an arc-shaped cross section perpendicular to the flow direction.

3. The cover member according to claim 1 or 2, At least one of the first hole portion and the second hole portion is formed as a long hole extending in a direction in which the second circumferential end portion moves relative to the first circumferential end portion when the first circumferential end portion and the second circumferential end portion are butted together. Cover member.

4. The cover member according to claim 1 or 2, an extension portion configured to extend from one of the first circumferential end portion and the second circumferential end portion along the circumferential direction; a crimping slit portion disposed on the other of the first circumferential end portion and the second circumferential end portion and through which the extension portion is inserted; The cover member further comprises:

5. The cover member according to claim 4, The crimping portion is formed by bending an extension portion inserted into the crimping slit portion. Cover member.

6. The cover member according to claim 1 or 2, The second region is configured to extend from the second circumferential end along the circumferential direction, The cover member is provided on the first peripheral end side with a positioning slit portion through which the second region is inserted. Cover member.

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