Exhaust component and method for manufacturing exhaust component

Abstract

To reduce types of members for manufacturing an exhaust component.SOLUTION: A cylindrical exhaust component has a first member and a second member that are members with the same shape or members obtained by processing at least part of the members with the same shape. Each of the first member and the second member includes a body part, at least one first joined part and at least one second joined part. The second member is disposed to face the first member in the same orientation as that of the first member if the first member is rotated 180 degrees on the basis of the first member. The at least one first joined part of the first member is joined to cover the at least one second joined part of the second member. The at least one first joined part of the second member is joined to cover the at least one second joined part of the first member.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to exhaust components. [Background technology]

[0002] Exhaust parts that cover the outer peripheral surface of a cylindrical member are known. For example, Patent Document 1 discloses a diffuser that is a cover member that covers the outer peripheral surface of a cylindrical catalyst case. The diffuser has a substantially semi-cylindrical first divided section and a second divided section, and the ends of the divided sections are butt-welded together to form a circular cross section as a whole. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2008-121550 Summary of the Invention [Problem to be solved by the invention]

[0004] In the prior art disclosed in Patent Document 1, the first and second divided parts constituting the cover member have different shapes, and therefore, in order to mold the first and second divided parts, it was necessary to prepare separate molds corresponding to the respective parts.

[0005] One aspect of the present disclosure is to reduce the number of parts required to manufacture an exhaust component. [Means for solving the problem]

[0006] One aspect of the present disclosure is a cylindrical exhaust component through which exhaust gas flows, comprising a first member and a second member that are identical in shape or are obtained by processing at least a portion of a member of the same shape. Each of the first member and the second member has a main body portion, at least one first bonding portion, and at least one second bonding portion.

[0007] The main body extends along the exhaust flow direction and has a semicircular cross section perpendicular to the flow direction. The first joint is formed on at least one of a first end and a second end opposite the first end in the circumferential direction of the main body. The second joint is formed on at least one of the first end and the second end in the circumferential direction of the main body.

[0008] The second member is positioned so as to face the first member in the same orientation as the first member would be if the first member were rotated 180 degrees circumferentially relative to the first member, or in the same orientation as the first member would be if the first member were rotated 180 degrees around a virtual line connecting both circumferential ends of the main body of the first member and perpendicular to the flow direction.

[0009] At least one first joint portion of the first member is joined to cover at least one second joint portion of the second member, and at least one first joint portion of the second member is joined to cover at least one second joint portion of the first member.

[0010] According to this configuration, the first member and the second member can be molded using a common mold, which reduces the number of types of members required to manufacture the exhaust part.

[0011] In one embodiment of the present disclosure, the at least one first joint portion of the first member and the at least one second joint portion of the second member may be joined to overlap in a radial direction of the exhaust component, and the at least one first joint portion of the second member and the at least one second joint portion of the first member may be joined to overlap in the radial direction.

[0012] According to this configuration, the length by which the first joint portion and the second joint portion protrude outward in the radial direction can be reduced, thereby making it possible to save space. In one embodiment of the present disclosure, at least one first joint portion of the first member and at least one second joint portion of the second member may be joined by welding, and at least one first joint portion of the second member and at least one second joint portion of the first member may be joined by welding.

[0013] With this configuration, the durability of the exhaust parts against vibrations and the like is improved. In one aspect of the present disclosure, in each of the first member and the second member, at least one first joint and at least one second joint may be formed at both the first end and the second end in the circumferential direction of the main body portion, and may be positioned so as to be aligned in the flow direction at each of the first end and the second end.

[0014] With this configuration, the welded portions are dispersed, so that it is possible to reduce thermal strain in the first member and the second member that occurs in one welding operation. One aspect of the present disclosure is a method for manufacturing a tubular exhaust part through which exhaust flows, comprising preparing a first member and a second member, arranging the first member and the second member, and joining the first member and the second member.

[0015] Preparing the first member and the second member includes molding a first molded product, molding a second molded product, preparing the first molded product or a first processed product obtained by processing the first molded product as the first member, and preparing the second molded product or a second processed product obtained by processing the second molded product as the second member.

[0016] Molding the first molded product includes molding the first molded product by press molding using a mold. Molding the second molded product includes molding the second molded product as a molded product having the same shape as the first molded product by press molding using the same mold as used to mold the first molded product.

[0017] Each of the first member and the second member includes a main body, at least one first joint, and at least one second joint. The main body extends along the exhaust flow direction and has a semicircular cross section perpendicular to the flow direction. The first joint is formed at at least one of a first end portion and a second end portion located opposite the first end portion in the circumferential direction of the main body. The second joint is formed at at least one of the first end portion and the second end portion of the main body.

[0018] Arranging includes arranging the second member so that it faces the first member in the same orientation as the orientation of the first member when the first member is rotated 180 degrees circumferentially with the first member as a reference, or in the same orientation as the orientation of the first member when the first member is rotated 180 degrees around a virtual line connecting both circumferential ends of the main body of the first member and perpendicular to the flow direction.

[0019] The joining includes joining at least one first joint portion of the first member so as to cover at least one second joint portion of the second member, and joining at least one first joint portion of the second member so as to cover at least one second joint portion of the first member.

[0020] According to this configuration, the first member and the second member can be molded using a common mold, which reduces the number of types of members required to manufacture the exhaust part. [Brief explanation of the drawings]

[0021] [Figure 1] FIG. 2 is an exploded perspective view of the exhaust component of the first embodiment. [Figure 2] FIG. 2 is a perspective view of the exhaust component of the first embodiment. [Figure 3] FIG. 2 is a side view of the exhaust component of the first embodiment. [Figure 4] 4A and 4B are cross-sectional views of the exhaust component taken along lines IVA-IVA and IVB-IVB, respectively. [Figure 5]4 is a flowchart showing a method for manufacturing the exhaust part according to the first embodiment. [Figure 6] FIG. 10 is an exploded perspective view of an exhaust component according to a second embodiment. [Figure 7] FIG. 10 is a perspective view of an exhaust component according to a second embodiment. [Figure 8] 6 is a flowchart showing a method for manufacturing an exhaust part according to a second embodiment. [Figure 9] FIG. 10 is a side view of the exhaust component of the second embodiment. [Figure 10] FIG. 10 is a top view of the exhaust part of the second embodiment. [Figure 11] 11A and 11B are cross-sectional views of the exhaust component taken along lines XIA-XIA and XIB-XIB, respectively. DETAILED DESCRIPTION OF THE INVENTION

[0022] Hereinafter, exemplary embodiments of the present disclosure will be described with reference to the drawings. [1. First embodiment] [1-1.Configuration] [1-1-1. Overall structure] The exhaust part 1 shown in Figures 1 and 2 is a member for covering a catalyst case that houses a catalyst that purifies exhaust gas in the exhaust system of an automobile or the like. The exhaust part 1 functions as a component that constitutes a heat insulator by covering the outer surface of the catalyst case together with a heat insulating material. The exhaust part 1 is not limited to a heat insulator that covers the outer surface of the catalyst case, but may be, for example, a component that constitutes an insulator that covers the outer surface of an exhaust pipe or a silencer. It may also be a component that constitutes something other than a heat insulator.

[0023] The exhaust part 1 is a substantially cylindrical member extending along an axial direction A. The exhaust part 1 includes a first member 10 and a second member 20. The first member 10 is a substantially semi-cylindrical member extending along the axial direction A. The first member 10 is made of metal, for example, stainless steel. The first member 10 is manufactured by, for example, press molding. The first member 10 has a first main body portion 11, a first outer joint portion 12, and a first inner joint portion 13.

[0024] The first main body portion 11 is a main portion of the first member 10, and is a substantially semi-cylindrical portion extending along the axial direction A. A cross section of the first main body portion 11 perpendicular to the axial direction A has a semi-circular shape.

[0025] The first body portion 11 has two regions, a 1A body portion 11a and a 1B body portion 11b. The 1A body portion 11a and the 1B body portion 11b are each a region obtained by dividing the first body portion 11 in half in the axial direction A. The 1A body portion 11a is a region on a first side in the axial direction A of the first body portion 11. The 1B body portion 11b is a region on a second side opposite to the first side in the axial direction A of the first body portion 11. The length in the axial direction A of the 1A body portion 11a and the length in the axial direction A of the 1B body portion 11b are the same.

[0026] Two first outer joint portions 12 are provided in total, one at a first end portion and one at a second end portion located opposite to the first end portion in the circumferential direction of the first main body portion 11. Both of the two first outer joint portions 12 are provided on the firstA main body portion 11a.

[0027] A step is provided at the boundary between the first outer joint portion 12 and the first A main body portion 11a. The first outer joint portion 12 is located radially outward of the first A main body portion 11a. The first outer joint portion 12 protrudes circumferentially from the portion where the step is provided and extends along the axial direction A.

[0028] Two first inner joint portions 13 are provided in total, one at each of the first end and second end of the first main body portion 11 in the circumferential direction of the first main body portion 11. Both of the two first inner joint portions 13 are provided on the firstB main body portion 11b. The first inner joint portions 13 protrude circumferentially from the first end and the second end, respectively, and extend along the axial direction A.

[0029] The thickness of the first inner joint portion 13 is approximately the same as the thickness of the first main body portion 11. The height of the step provided at the boundary between the first outer joint portion 12 and the firstA main body portion 11a is approximately the same as the thickness of the first inner joint portion 13.

[0030] The second member 20 is a substantially semi-cylindrical member having the same shape as the first member 10. The second member 20 is made of metal, for example, stainless steel. The second member 20 is manufactured by, for example, press molding. The second member 20 includes a second main body portion 21, a second outer joint portion 22, and a second inner joint portion 23. The second main body portion 21 has two regions, a 2A main body portion 21a and a 2B main body portion 21b.

[0031] The second main body portion 21, the second A main body portion 21a, the second B main body portion 21b, the second outer joint portion 22, and the second inner joint portion 23 correspond to the first main body portion 11, the first A main body portion 11a, the first B main body portion 11b, the first outer joint portion 12, and the first inner joint portion 13 of the first member 10, respectively.

[0032] In this embodiment, the second member 20 has the same shape as the first member 10. However, the first member 10 and the second member 20 are not limited to having the same shape, and may be members obtained by processing at least a portion of a member of the same shape. Examples of processing a portion of the member of the same shape include forming a hole or forming a surface for attaching another component such as a sensor boss.

[0033] For example, a first molded product 10a and a second molded product 20a having the same shape may be molded by press molding using the same mold. The first molded product 10a and the second molded product 20a extend along the axial direction A and have a semicircular cross section perpendicular to the axial direction A. The first member 10 may be the first molded product 10a, or may be a first processed product 10b obtained by processing the first molded product 10a. The second member 20 may be the second molded product 20a, or may be a second processed product 20b obtained by processing the second molded product 20a.

[0034] [1-1-2. Exhaust Parts Manufacturing Method] As shown in FIG. 5, the method for manufacturing the exhaust part 1 includes a first molding step S101, a second molding step S102, a first preparation step S103, a second preparation step S104, an arrangement step S105, and a joining step S106.

[0035] The manufacturing method of the exhaust part 1 is performed in the following order: first molding step S101, second molding step S102, first preparation step S103, second preparation step S104, arrangement step S105, and joining step S106. However, the manufacturing method of the exhaust part 1 is not limited to this order. The second molding step S102 and the second preparation step S104 only need to be performed before the arrangement step S105, and may be performed independently of the first molding step S101 and the first preparation step S103. For example, after the first molding step S101 and the second molding step S102 are performed in parallel, the first preparation step S103 and the second preparation step S104 may be performed in parallel.

[0036] The first molding step S101 is a step of molding a first molded product 10a as a molded product having the same shape common to the first member 10 and the second member 20 by press molding using a mold. The second molding step S102 is a step of molding a second molded product 20a as a molded product having the same shape as the first molded product 10a by press molding using the same mold as the mold used in the first molding step S101. The first molded product 10a and the second molded product 20a are molded products having the same shape that is common to the first member 10 and the second member 20.

[0037] The first preparation step S103 is a step of preparing a first molded product 10a or a first processed product 10b obtained by processing the first molded product 10a as the first member 10. The first processed product 10b is obtained, for example, by forming a hole in the first molded product 10a. The first preparation step S103 may include preparing the first molded product 10a or the first processed product 10b, which has been produced in advance, as one part (i.e., the first member 10) for manufacturing one exhaust part 1.

[0038] The second preparation step S104 is a step of preparing the second molded product 20a or the second processed product 20b obtained by processing the second molded product 20a as the second member 20. The second processed product 20b is obtained, for example, by forming a hole in the second molded product 20a. The second processed product 20b may have a shape different from that of the first processed product 10b. The second preparation step S104 may include preparing the second molded product 20a or the second processed product 20b, which has been produced in advance, as one part (i.e., the second member 20) for manufacturing one exhaust part 1.

[0039] The arrangement step S105 is a step of arranging the first member 10 and the second member 20. As shown in FIG. 1 , the second member 20 is arranged so as to face the first member 10 in the same orientation as the orientation of the first member 10 when the first member 10 is hypothetically rotated 180 degrees about an imaginary line B that connects both end portions in the circumferential direction of the first main body portion 11 of the first member 10 and is perpendicular to the axial direction A. At this time, in the circumferential direction of the first main body portion 11 of the first member 10, the first outer joint portion 12 of the first member 10 faces the second inner joint portion 23 of the second member 20. The first inner joint portion 13 of the first member 10 faces the second outer joint portion 22 of the second member 20.

[0040] 2, 3, and 4, the first outer joining portion 12 of the first member 10 is disposed radially outward of the second inner joining portion 23 so as to cover the second inner joining portion 23 of the second member 20. The second outer joining portion 22 of the second member 20 is disposed radially outward of the first inner joining portion 13 so as to cover the first inner joining portion 13 of the first member 10. At this time, the first outer joining portion 12 abuts against the second inner joining portion 23. The second outer joining portion 22 abuts against the first inner joining portion 13. There may or may not be a gap between these abutting portions.

[0041] The joining step S106 is a step of joining the first member 10 and the second member 20. The first outer joining portion 12 and the second inner joining portion 23 are joined by welding. The second outer joining portion 22 and the first inner joining portion 13 are joined by welding.

[0042] The welding is performed, for example, by fillet welding on the end face of the first outer joint portion 12 and the outer surface of the second outer joint portion 22. Alternatively, the welding may be performed so as to extend in the form of a solid line, a dotted line, or a dashed line along the axial direction A at a position where the first outer joint portion 12 and the second inner joint portion 23 overlap in the radial direction.

[0043] The welding between the second outer joining portion 22 and the first inner joining portion 13 is similar to the welding between the first outer joining portion 12 and the second inner joining portion 23 . Welding is performed at least four locations: the portions where each of the two first outer joint portions 12 abuts against the second inner joint portion 23, and the portions where each of the two second outer joint portions 22 abuts against the first inner joint portion 13. The joining is not limited to welding, and may be achieved by, for example, crimping, engagement with claws or the like, or screwing with screws or the like.

[0044] In this manner, the first member 10 and the second member 20 are joined together to obtain the exhaust part 1. [1-2. Actions and Effects] According to the embodiment described above in detail, the following actions and effects can be obtained.

[0045] (1a) The second member 20 has the same shape as the first member 10. The second member 20 can be molded using the same mold as that used to mold the first member 10. This allows the number of types of members required to manufacture the exhaust part 1 to be reduced.

[0046] (1b) The first outer joint portion 12 and the second inner joint portion 23 are joined by welding. The second outer joint portion 22 and the first inner joint portion 13 are joined by welding. This configuration improves the durability of the exhaust part 1 against vibrations and the like.

[0047] (1c) The first outer joint portion 12 and the first inner joint portion 13 are formed at both the first end portion and the second end portion in the circumferential direction of the first main body portion 11, and are positioned at each of the first end portion and the second end portion so as to be aligned in the axial direction A. The first outer joint portion 12 and the first inner joint portion 13 are aligned in the same order in the axial direction A at the first end portion and the second end portion, but may be aligned in different orders.

[0048] The second outer joint portion 22 and the second inner joint portion 23 are formed at both a first end portion and a second end portion in the circumferential direction of the second main body portion 21, and are positioned at each of the first end portion and the second end portion so as to be aligned in the axial direction A. The second outer joint portion 22 and the second inner joint portion 23 are aligned in the same order in the axial direction A at the first end portion and the second end portion, but may be aligned in different orders.

[0049] Welding is performed at least four locations: the locations where each of the two first outer joints 12 abuts against the second inner joint 23, and the locations where each of the two second outer joints 22 abuts against the first inner joint 13.

[0050] In this way, when the welded portions are dispersed, it is possible to reduce the thermal strain of the first member 10 and the second member 20 that occurs in one welding operation. Furthermore, among the at least four welded portions, welding may be performed starting with the portions located diagonally opposite each other. For example, first, the first outer joint portion 12 and the second inner joint portion 23 at a first circumferential end portion of the first-A main body portion 11a may be welded together. Then, the first inner joint portion 13 at a second circumferential end portion of the first-B main body portion 11b may be welded together with the second outer joint portion 22 of the second member 20 that abuts against the first inner joint portion 13. Then, the remaining unwelded portion, i.e., the first outer joint portion 12 and the second inner joint portion 23 at a second circumferential end portion of the first-A main body portion 11a may be welded together, and then the second outer joint portion 22 and the first inner joint portion 13 at a first circumferential end portion of the first-B main body portion 11b may be welded together.

[0051] Such welding can further reduce the thermal strain of the first member 10 and the second member 20 that occurs during a single welding operation. (1d) The first outer joining portion 12 and the second outer joining portion 22 have shapes different from the second inner joining portion 23 and the first inner joining portion 13. Specifically, the first outer joining portion 12 and the second outer joining portion 22 have shapes complementary to the second inner joining portion 23 and the first inner joining portion 13. Therefore, it is possible to achieve good joining.

[0052] (1e) The height of the step provided at the boundary between the first outer joint portion 12 and the 1A main body portion 11a is approximately the same as the thickness of the first inner joint portion 13. The first outer joint portion 12 protrudes in the circumferential direction from the portion where the step is provided.

[0053] The height of the step provided at the boundary between the second outer joint portion 22 and the 2A main body portion 21a is approximately the same as the thickness of the second inner joint portion 23. The second outer joint portion 22 protrudes in the circumferential direction from the portion where the step is provided.

[0054] According to this configuration, the length by which the first outer joint portion 12 and the second outer joint portion 22 protrude outward in the radial direction can be reduced, thereby making it possible to save space. [1-3. Correspondence between terms] In the above embodiment, the first outer joint 12 corresponds to an example of a first joint of the first member, and the second outer joint 22 corresponds to an example of a first joint of the second member. The first inner joint 13 corresponds to an example of a second joint of the first member, and the second inner joint 23 corresponds to an example of a second joint of the second member. The axial direction A corresponds to an example of a flow direction.

[0055] The first molding step S101 corresponds to an example of molding a first molded product, and the second molding step S102 corresponds to an example of molding a second molded product. The first preparation step S103 corresponds to an example of preparing a first molded product or a first processed product as a first member, and the second preparation step S104 corresponds to an example of preparing a second molded product or a second processed product as a second member. The arrangement step S105 corresponds to an example of arranging a first member and a second member. The joining step S106 corresponds to an example of joining a first member and a second member.

[0056] [2. Second Embodiment] [2-1.Configuration] [2-1-1. Overall structure] 6 and 7, the basic configuration of the exhaust part 201 in the second embodiment is similar to that of the exhaust part 1 in the first embodiment, and therefore differences between the second embodiment and the first embodiment will be described below. Note that the same reference numerals as in the first embodiment indicate the same configuration, and reference is made to the preceding description.

[0057] An exhaust part 201 of the second embodiment includes a first member 210 and a second member 220 instead of the first member 10 and the second member 20 of the first embodiment described above. The first member 210 and the second member 220 of the second embodiment have the same configuration as the first member 10 and the second member 20 of the first embodiment, except for the structures that function as the first joint portion and the second joint portion.

[0058] That is, the first member 210 has a first main body portion 211 having the same shape as the first main body portion 11. The first main body portion 211 has a 1A main body portion 211a corresponding to the 1A main body portion 11a, and further has a 1B main body portion 211b corresponding to the 1B main body portion 11b.

[0059] A first molded product 210a and a second molded product 220a having the same shape may be molded by press molding using the same mold. The first molded product 210a and the second molded product 220a extend along the axial direction A and have a semicircular cross section perpendicular to the axial direction A. The first member 210 may be the first molded product 210a, or may be a first processed product 210b obtained by processing the first molded product 210a. The second member 220 may be the second molded product 220a, or may be a second processed product 220b obtained by processing the second molded product 220a.

[0060] The first member 210 has a first wide joint portion 212 and a first narrow joint portion 213 instead of the first outer joint portion 12 and the first inner joint portion 13 . Two first wide joints 212 are provided in total, one at a first end portion in the circumferential direction of the first main body portion 211 and one at a second end portion located opposite the first end portion. One of the two first wide joints 212 is provided in the firstA main body portion 211a, and the other is provided in the firstB main body portion 211b. The first wide joints 212 protrude radially outward from the first end portion or the second end portion of the first main body portion 211 and extend along the axial direction A.

[0061] Two first narrow joints 213 are provided in total, one at each of the first end and second end in the circumferential direction of the first main body portion 211. One of the two first narrow joints 213 is provided in the 1A main body portion 211a, and the other is provided in the 1B main body portion 211b. The first narrow joints 213 are provided in each of the 1A main body portion 211a and the 1B main body portion 211b at the end opposite in the circumferential direction to the end where the first wide joint 212 is provided. The first narrow joints 213 protrude radially outward from the first end or the second end of the first main body portion 211 and extend along the axial direction A.

[0062] The radially outward protrusion length of the first wide junction 212 is greater than the radially outward protrusion length of the first narrow junction 213. However, the radially outward protrusion lengths of both the first wide junction 212 and the first narrow junction 213 may be the same. In other words, the first wide junction 212 and the first narrow junction 213 may have the same shape.

[0063] The second member 220 is a member having the same shape as the first member 210. The second member 220 includes a second main body portion 221, a second wide joint portion 222, and a second narrow joint portion 223. The second main body portion 221 has two regions, a second A main body portion 221a and a second B main body portion 221b.

[0064] The second main body portion 221, the second A main body portion 221a, the second B main body portion 221b, the second wide joint portion 222, and the second narrow joint portion 223 correspond to the first main body portion 211, the first A main body portion 211a, the first B main body portion 211b, the first wide joint portion 212, and the first narrow joint portion 213 of the first member 210, respectively.

[0065] That is, the length by which the first wide joint 212 protrudes radially outward is greater than the length by which the second narrow joint 223 protrudes radially outward. The length by which the second wide joint 222 protrudes radially outward is greater than the length by which the first narrow joint 213 protrudes radially outward.

[0066] [2-1-2. Exhaust Parts Manufacturing Method] 8, the manufacturing method of the exhaust part 201 includes a first molding step S201, a second molding step S202, a first preparation step S203, a second preparation step S204, an arrangement step S205, and a joining step S206. The first molding step S201, the second molding step S202, the first preparation step S203, the second preparation step S204, the arrangement step S205, and the joining step S206 correspond to the first molding step S101, the second molding step S102, the first preparation step S103, the second preparation step S104, the arrangement step S105, and the joining step S106 in the first embodiment, respectively.

[0067] The manufacturing method of the exhaust part 201 is performed in the following order: first molding step S201, second molding step S202, first preparation step S203, second preparation step S204, arrangement step S205, and joining step S206. However, the manufacturing method of the exhaust part 1 is not limited to this order. The second molding step S202 and the second preparation step S204 only need to be performed before the arrangement step S205, and may be performed independently of the first molding step S201 and the first preparation step S203. For example, after the first molding step S201 and the second molding step S202 are performed in parallel, the first preparation step S203 and the second preparation step S204 may be performed in parallel.

[0068] The first molding step S201 is a step of molding a first molded product 210a as a molded product having the same shape common to the first member 210 and the second member 220 by press molding using a mold. The second molding process S202 is a process of molding the second molded product 220a as a molded product of the same shape common to the first member 210 and the second member 220 by press molding using the same mold as the mold used in the first molding process S201.

[0069] The first preparation step S203 is a step of preparing a first molded product 210a or a first processed product 210b obtained by processing the first molded product 210a as the first member 210. The first processed product 210b is obtained, for example, by forming a hole in the first molded product 210a.

[0070] The second preparation step S204 is a step of preparing a second molded product 220a or a second processed product 220b obtained by processing the second molded product 220a as the second member 220. The second processed product 220b is obtained, for example, by forming a hole in the second molded product 220a. The second processed product 220b may have a shape different from that of the first processed product 210b.

[0071] The arrangement step S205 is a step of arranging the first member 210 and the second member 220. As shown in Fig. 6, the second member 220 is arranged so as to face the first member 210 in the same orientation as the orientation of the first member 210 when the first member 210 is rotated 180 degrees in the circumferential direction with the first member 210 as a reference. At this time, in the circumferential direction of the first main body portion 211 of the first member 210, the first wide joint portion 212 of the first member 210 faces the second narrow joint portion 223 of the second member 220. The first narrow joint portion 213 of the first member 210 faces the second wide joint portion 222 of the second member 220.

[0072] 7, 9, 10, and 11, the first wide joint 212 of the first member 210 is disposed so as to cover the second narrow joint 223 of the second member 220. The second wide joint 222 of the second member 220 is disposed so as to cover the first narrow joint 213 of the first member 210. At this time, the first wide joint 212 overlaps and abuts on the second narrow joint 223 in the circumferential direction. The second wide joint 222 overlaps and abuts on the first narrow joint 213 in the circumferential direction. There may or may not be a gap between these abutting portions.

[0073] The joining step S206 is a step of joining the first member 210 and the second member 220. The first wide joint portion 212 and the second narrow joint portion 223 are joined by welding. The second wide joint portion 222 and the first narrow joint portion 213 are joined by welding.

[0074] The welding is performed, for example, by fillet welding on the circumferential surface of the second wide joint 222 and the end face of the first narrow joint 213. In Fig. 10, the weld W between the second wide joint 222 and the first narrow joint 213 is represented by a thick line. Alternatively, the welding may be performed so as to extend in the axial direction A as a solid line, dotted line, or dashed line at a position where the second wide joint 222 and the first narrow joint 213 overlap in the circumferential direction.

[0075] The welding between the first wide joint portion 212 and the second narrow joint portion 223 is similar to the welding between the second wide joint portion 222 and the first narrow joint portion 213. Welding is performed at least four locations: at the portions where each of the two first wide joints 212 abuts on the second narrow joints 223, and at the portions where each of the two second wide joints 222 abuts on the first narrow joints 213. The joining is not limited to welding, and may be achieved by, for example, crimping, engagement with claws or the like, or screwing with screws or the like.

[0076] In this manner, the first member 210 and the second member 220 are joined together to obtain the exhaust part 201. [2-2. Actions and Effects] According to the second embodiment described above in detail, the same effects as those of the first embodiment can be obtained. In addition, according to the second embodiment, the following actions and effects can be obtained.

[0077] (2a) The length by which the first wide joint 212 protrudes radially outward is greater than the length by which the second narrow joint 223 protrudes radially outward. The length by which the second wide joint 222 protrudes radially outward is greater than the length by which the first narrow joint 213 protrudes radially outward.

[0078] With this configuration, it is possible to ensure the welding allowance required to weld the first wide joint 212 and the second narrow joint 223, and the welding allowance required to weld the second wide joint 222 and the first narrow joint 213.

[0079] [2-3. Correspondence between terms] In the above embodiment, the first wide joint 212 corresponds to an example of a first joint of the first member, and the second wide joint 222 corresponds to an example of a first joint of the second member. The first narrow joint 213 corresponds to an example of a second joint of the first member, and the second narrow joint 223 corresponds to an example of a second joint of the second member.

[0080] The first molding step S201 corresponds to an example of molding a first molded product, and the second molding step S202 corresponds to an example of molding a second molded product. The first preparation step S203 corresponds to an example of preparing a first molded product or a first processed product as a first member, and the second preparation step S204 corresponds to an example of preparing a second molded product or a second processed product as a second member. The arrangement step S205 corresponds to an example of arranging a first member and a second member. The joining step S206 corresponds to an example of joining a first member and a second member.

[0081] 3. Other Embodiments Although the embodiments of the present disclosure have been described above, it goes without saying that the present disclosure is not limited to the above-described embodiments and can take on various forms.

[0082] (3a) In the above embodiment, two of each of the first outer joint portion 12, the second outer joint portion 22, the first wide joint portion 212, and the second wide joint portion 222 are provided. However, the number of first outer joints 12, second outer joints 22, first wide joints 212, and second wide joints 222 is not limited to two, and it is sufficient that at least one is provided.

[0083] As an example, in the first member 10 of the exhaust component 1 (see FIGS. 1 to 4 ), the first outer joint portion 12 does not have to be provided at both the first end and the second end in the circumferential direction of the first main body portion 11. That is, it is sufficient that at least one first outer joint portion 12 is formed at at least one of the first end and the second end of the first main body portion 11. Similarly, it is sufficient that at least one first inner joint portion 13 is formed at at least one of the first end and the second end of the first main body portion 11.

[0084] For example, at least one first outer joint portion 12 may be provided at a first circumferential end portion of the first main body portion 11, and at least one first inner joint portion 13 may be provided at a second end portion. In this case, the first inner joint portion 13 may be provided so as to be positioned at the same position in the axial direction A as the first outer joint portion 12. As an example, the first outer joint portion 12 may be provided at a first circumferential end portion of the firstA main body portion 11a of the first main body portion 11, and the first inner joint portion 13 may be provided at a second circumferential end portion of the firstA main body portion 11a so as to be positioned at the same position in the axial direction A as the first outer joint portion 12. In this case, the second member 20 may be disposed so as to face the first member 10 in the same orientation as the orientation of the first member 10 when the first member 10 is rotated 180 degrees in the circumferential direction. In this example, the firstA main body portion 11a may be read as the firstB main body portion 11b. The first end and the second end may be read as the second end and the first end, respectively.

[0085] Alternatively, at least one first outer joint portion 12 and at least one first inner joint portion 13 may be provided at either the first end portion or the second end portion in the circumferential direction of the first main body portion 11. In this case, the second member 20 can be disposed so as to face the first member 10 in the same orientation as the orientation of the first member 10 when the first member 10 is rotated 180 degrees around the imaginary line B.

[0086] If there is an end portion among the first end portion and the second end portion in the circumferential direction of the first body portion 11 where neither the first outer joint portion 12 nor the first inner joint portion 13 is formed, the first member 10 and the second member 20 may be joined at that end portion by butt welding the first body portion 11 to the second body portion 21. In this example, the second member 20 is also configured as a member having the same shape as the first member 10. That is, it is sufficient that at least one second outer joint portion 22 and one second inner joint portion 23 are formed at at least one of the first end portion and the second end portion of the second body portion 21.

[0087] The same is true for both the first wide joint 212 and the second wide joint 222 of the exhaust component 201 . (3b) In the above embodiment, the first outer joint portion 12 protrudes circumferentially from a step provided at the boundary between the first outer joint portion 12 and the 1A main body portion 11a and extends in the axial direction A. The first inner joint portion 13 protrudes circumferentially from an end portion in the circumferential direction of the 1B main body portion 11b and extends along the axial direction A.

[0088] However, the first outer joint portion 12 may be a plate-like portion that extends from the step in the tangential direction of the first main body portion 11 and in the axial direction A. The first inner joint portion 13 may be a plate-like portion that extends from an end portion in the circumferential direction of the firstB main body portion 11b in the tangential direction of the first main body portion 11 and in the axial direction A. In this case, the first member 10 may have a U-shaped cross section perpendicular to the axial direction A. Similarly, the second member 20 may have a U-shaped cross section perpendicular to the axial direction A. The exhaust part 1 may have an oval cross section perpendicular to the axial direction A.

[0089] (3c) Multiple functions of one component in the above embodiments may be realized by multiple components, or one function of one component may be realized by multiple components. Also, multiple functions of 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. [Explanation of symbols]

[0090] 1,201…Exhaust component, 10,210…First component, 10a,210a…First molded product, 10b,210b…First processed product, 11,11a,11b,211,211a,211b…First main body, 12…First outer joint, 13…First inner joint, 20,220…Second component, 20a,220a…Second finished product shaped product, 20b, 220b…second processed product, 21, 21a, 21b, 221, 221a, 221b…second main body, 22…second outer joint, 23…second inner joint, 212…first wide joint, 213…first narrow joint, 222…second wide joint, 223…second narrow joint, A…axial direction, B…imaginary line.

Claims

1. A cylindrical exhaust part through which exhaust flows, The method includes the steps of: providing a first member and a second member that are members of the same shape or members obtained by processing at least a part of the members of the same shape; Each of the first member and the second member is a main body portion extending along the flow direction of the exhaust gas and having a semicircular cross section perpendicular to the flow direction; at least one first joint portion formed on at least one of a first end portion of the main body portion in a circumferential direction and a second end portion located opposite to the first end portion; at least one second joint formed on at least one of the first end and the second end of the body portion; Equipped with the second member is disposed so as to face the first member in the same orientation as the orientation of the first member when the first member is rotated 180 degrees in the circumferential direction with the first member as a reference, or in the same orientation as the orientation of the first member when the first member is rotated 180 degrees around a virtual line connecting both end portions of the main body portion of the first member in the circumferential direction and perpendicular to the flow direction, the at least one first joint portion of the first member is joined to cover the at least one second joint portion of the second member, the at least one first joint portion of the second member is joined to cover the at least one second joint portion of the first member; Exhaust parts.

2. 2. The exhaust component of claim 1, the at least one first joint portion of the first member and the at least one second joint portion of the second member are joined to overlap in a radial direction of the exhaust component, The at least one first joint portion of the second member and the at least one second joint portion of the first member are joined so as to overlap in the radial direction. Exhaust parts.

3. 3. The exhaust component according to claim 1 or 2, the at least one first joint portion of the first member and the at least one second joint portion of the second member are joined by welding, the at least one first joint portion of the second member and the at least one second joint portion of the first member are joined by welding; Exhaust parts.

4. 4. The exhaust component of claim 3, In each of the first member and the second member, The at least one first joint portion and the at least one second joint portion are both formed at both the first end portion and the second end portion, and are positioned so as to be aligned in the flow direction at each of the first end portion and the second end portion. Exhaust parts.

5. A method for manufacturing a tubular exhaust part through which exhaust flows, comprising: providing a first member and a second member; disposing the first member and the second member; joining the first member and the second member; Equipped with Providing the first member and the second member includes: forming a first molded product by press molding using a mold; Molding a second molded product as a molded product having the same shape as the first molded product by press molding using the mold; preparing the first molded product or a first processed product obtained by processing the first molded product as the first member; Preparing the second molded product or a second processed product obtained by processing the second molded product as the second member; Including, Each of the first member and the second member is a main body portion extending along the flow direction of the exhaust gas and having a semicircular cross section perpendicular to the flow direction; at least one first joint portion formed on at least one of a first end portion of the main body portion in a circumferential direction and a second end portion located opposite to the first end portion; at least one second joint formed on at least one of the first end and the second end of the body portion; Equipped with the disposing includes disposing the second member to face the first member in the same orientation as the orientation of the first member when the first member is rotated 180 degrees in the circumferential direction with the first member as a reference, or in the same orientation as the orientation of the first member when the first member is rotated 180 degrees around a virtual line connecting both end portions of the main body portion of the first member in the circumferential direction and perpendicular to the flow direction, The joining step comprises: Joining the at least one first joint portion of the first member so as to cover the at least one second joint portion of the second member; Joining the at least one first joint portion of the second member so as to cover the at least one second joint portion of the first member; Including, Manufacturing method for exhaust parts.

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