Exhaust system device

Abstract

To inhibit the size of an exhaust system device from increasing due to a space needed for welding.SOLUTION: An exhaust system device includes a cylindrical member, a connection member, and a welded member. The connection member is connected to the cylindrical member so as to at least partially cover an opening end of the cylindrical member. The welded member is disposed at a side part of the cylindrical member. The connection member is connected to the cylindrical member by welding. At least one of the cylindrical member and the connection member has a cutout part having a shape corresponding to an outer edge of the welded member at a border between the cylindrical member and the connection member. The welded member is disposed at the border between the cylindrical member and the connection member so as to be partially housed in the cutout part and welded to at least one of the cylindrical member and the connection member.SELECTED DRAWING: Figure 2

Description

[Technical field]

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

[0002] A sensor for detecting components of exhaust gas is disposed in an exhaust system through which exhaust gas from an internal combustion engine flows. This sensor is attached to the exhaust system via a boss (see Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2011-208572 A Summary of the Invention [Problem to be solved by the invention]

[0004] The boss is joined to the case of the exhaust system by welding. However, there may be other parts to be welded around the boss. As is well known, welding requires a space for arranging a torch. Therefore, in a case where parts to be welded are scattered around the boss, the exhaust system becomes large because a space must be secured for arranging a torch for each welding.

[0005] Therefore, according to one aspect of the present disclosure, it is desirable to provide a technique that can suppress an increase in size of an exhaust system due to the space required for welding. [Means for solving the problem]

[0006] An exhaust system device according to one aspect of the present disclosure includes a tubular member, a connecting member, and a welded member. The tubular member is configured to allow exhaust gas to flow through the connecting member. The connecting member is connected to the tubular member so as to at least partially cover an open end of the tubular member. The welded member is disposed on a side of the tubular member.

[0007] The connecting member is connected to the tubular member by welding. At least one of the tubular member and the connecting member has a notch portion having a shape corresponding to an outer edge of the welded member at the boundary between the tubular member and the connecting member. The welded member is disposed at the boundary between the tubular member and the connecting member so as to be partially contained inside the notch portion, and is welded to at least one of the tubular member and the connecting member.

[0008] Conventionally, the welding of the welded member to the tubular member and the welding of the tubular member to the connecting member have been performed at separate points in the axial direction of the tubular member, which requires a space between these welding points, which has led to an increase in the size of the exhaust system in the axial direction.

[0009] According to the configuration of the exhaust system device of one aspect of the present disclosure, the welding points between the tubular member and the connecting member and the welding points between the tubular member and at least one of the connecting member and the welded member can be gathered in one area in the axial direction of the tubular member. Therefore, it is not necessary to secure the space required for welding multiple separated points as in the conventional method. Therefore, according to this exhaust system device, it is possible to suppress the size of the exhaust system device from increasing due to the space required for welding.

[0010] According to one aspect of the present disclosure, the welded member may be welded to the tubular member and the connecting member. According to one aspect of the present disclosure, the welded member may be welded to the tubular member and the connecting member around its periphery or around the notch. Such welding may adequately secure the welded member to the tubular member and the connecting member.

[0011] According to one aspect of the present disclosure, the tubular member may be a case that houses an exhaust gas purification member therein. The welded member may be a boss for attaching a part to the inside of the tubular member. A hole leading to the inside of the tubular member may be formed at the boundary between the tubular member and the connecting member at a position corresponding to the notch or outside the notch. With this configuration, welding of the boss and welding of the tubular member and the connecting member can be efficiently performed.

[0012] According to one aspect of the present disclosure, the workpieces may have a cylindrical outer shape, and the cutout may be an arcuate cutout that conforms to an outer edge of the workpieces.

[0013] According to one aspect of the present disclosure, the connecting member may be connected to the tubular member so as to cover the side of the tubular member from the outside around the open end. In this case, the notch may be provided at least in the connecting member. With this configuration, welding between the welded member and the notch can be easily performed from the outside of the tubular member and the connecting member.

[0014] According to one aspect of the present disclosure, the tubular member and the connecting member may be butt-welded to each other around the cutout portion. With this configuration, it is possible to increase the joint strength between the tubular member and the connecting member around the cutout portion. [Brief description of the drawings]

[0015] [Figure 1] FIG. 2 is a plan view showing a schematic configuration of an exhaust system device. [Diagram 2] FIG. 2 is a plan view illustrating a configuration around a first boss in the exhaust system according to the first embodiment. [Diagram 3] FIG. 3 is a cross-sectional view of the exhaust system taken along line III-III. [Figure 4] FIG. 4A is a diagram showing a cross section parallel to the surface of the third tubular member around the installation location of the first boss, and FIG. 4B is a diagram showing a cross section parallel to the surface of the downstream connecting member around the installation location. [Diagram 5] FIG. 5A is a plan view showing the configuration around the location where a first boss is to be installed in an exhaust system before the first boss is installed, and FIG. 5B is a plan view showing the configuration around the first boss in an exhaust system before welding. [Figure 6] FIG. 6A is a VIA-VIA cross-sectional view of the exhaust system device in the periphery of the first boss, and FIG. 6B is a VIB-VIB cross-sectional view of the exhaust system device in the periphery of the first boss. [Figure 7]FIG. 4 is a cross-sectional view showing a configuration around a second boss in the exhaust system. [Figure 8] FIG. 8A is a plan view showing the configuration around a first boss in an exhaust system device of a second embodiment, and FIG. 8B is a plan view showing the configuration around the location where the first boss is to be installed in the exhaust system device before the first boss is installed. [Figure 9] FIG. 9 is a cross-sectional view of an exhaust system according to a second embodiment taken along line IX-IX of the present invention. [Figure 10] FIG. 10A is a cross-sectional view parallel to the surface of the third tubular member around the installation location of the first boss in the second embodiment, and FIG. 10B is a cross-sectional view parallel to the surface of the downstream connecting member around the installation location. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] Exemplary embodiments of the present disclosure will now be described with reference to the drawings. [First embodiment] The exhaust system device 1 of this embodiment shown in Fig. 1 is connected to a flow path of exhaust gas G generated in an internal combustion engine. The exhaust system device 1 is configured as an exhaust gas purification device that reduces environmental pollutants in the exhaust gas G. The exhaust system device 1 includes a pipe body 10, an upstream connecting member 50, a downstream connecting member 60, a first purification member 70, a second purification member 75, a first boss 80, a second boss 90, and a second boss 100. 0.

[0017] There is no particular limitation on the internal combustion engine connected to this exhaust system device 1. Examples of internal combustion engines include those used for driving or generating electricity in transportation equipment such as automobiles, trains, ships, and construction machines, and power generation facilities.

[0018] The pipe body 10 is a cylindrical member through which the exhaust gas G flows. The pipe body 10 includes a first cylindrical member 20, a second cylindrical member 30, and a third cylindrical member 40. Both ends of the first cylindrical member 20, the second cylindrical member 30, and the third cylindrical member 40 are all open.

[0019] The first tubular member 20 is connected to the upstream connecting member 50 around the first open end 21. Specifically, the first tubular member 20 fits into the upstream connecting member 50. In a state where the first tubular member 20 is fitted into the upstream connecting member 50, the first tubular member 20 is firmly connected to the upstream connecting member 50 by welding. The first open end 21 is located inside the upstream connecting member 50. In FIG. 1, parts hidden from the outside are indicated by dashed lines.

[0020] The first tubular member 20 is connected to the second tubular member 30 around a second open end 22 located axially opposite to the first open end 21. A flange 23 for connection to the second tubular member 30 is provided around the second open end 22 on the side of the first tubular member 20.

[0021] The side of the tubular member referred to here corresponds to a portion constituting the outer shape of the tubular member located in the circumferential direction around an axis extending from the first open end to the second open end of the tubular member. The flange 23 is welded to the side of the first tubular member 20.

[0022] A flange 33 for connection with the first tubular member 20 is provided on the side of the second tubular member 30. The flange 33 is provided around the first open end 31 adjacent to the first tubular member 20. The first tubular member 20 and the second tubular member 30 are connected to each other through the flanges 23, 33. The means for connecting the flanges 23, 33 is not limited to, but may be, for example, a bolt.

[0023] The second tubular member 30 further has a flange 34 for connection with the third tubular member 40 around the second opening end 32 opposite the first opening end 31 on its side. The third tubular member 40 has a flange 44 for connection with the second tubular member 30 around the first opening end 41 adjacent to the second tubular member 30 on its side. The second tubular member 30 and the third tubular member 40 are connected to each other through these flanges 34, 44. The means for connecting the flanges 34, 44 is not limited to, but may be, for example, a bolt.

[0024] The third tubular member 40 is connected to the downstream connecting member 60 around a second open end 42 located axially opposite to the first open end 41. Specifically, the third tubular member 40 is fitted into the downstream connecting member 60. The third tubular member 40 and the downstream connecting member 60 are firmly connected to each other by welding in a mutually fitted state.

[0025] The first cylindrical member 20 holds a first purification member 70 inside thereof. The second cylindrical member 30 holds a second purification member 75 inside thereof. The first cylindrical member 20 and the second cylindrical member 30 function as cases that house the first purification member 70 and the second purification member 75 for the exhaust gas G inside thereof, respectively. Although not shown, an elastic member is disposed between the first cylindrical member 20 and the first purification member 70. Similarly, an elastic member is disposed between the second cylindrical member 30 and the second purification member 75.

[0026] The first purification member 70 and the second purification member 75 are configured to reform or capture, or reform and capture, environmental pollutants in the exhaust gas G. The first purification member 70 and the second purification member 75 may be purification members of different types. The first purification member 70 and the second purification member 75 may be purification members of the same type.

[0027] Examples of environmental pollutants include carbon monoxide (CO), nitrogen oxides (NOx), particulate matter (PM), sulfur oxides (SOx), and hydrocarbons (HC). Examples of the first purification member 70 and the second purification member 75 include a diesel oxidation catalyst (DOC), a diesel particulate filter (DPF), a gasoline particulate filter (GPF), and a NOx adsorbent.

[0028] The DOC is a catalyst that oxidizes the soluble organic fraction (SOF), CO, and HC in the PM contained in the exhaust gas G. The DPF and GPF are filters that collect the PM contained in the exhaust gas G. The NOx adsorbent is a substance that adsorbs and removes NOx.

[0029] According to one example, in the exhaust system device 1, a DOC is provided as the first purification member 70, and a DPF is provided as the second purification member 75. No purification member is disposed inside the third cylindrical member 40. However, a purification member may be disposed inside the third cylindrical member 40 as long as it is a portion that does not affect welding.

[0030] The upstream connecting member 50 connected to the first cylindrical member 20 connects the pipe body 10 to the upstream of the flow path of the exhaust gas G. The downstream connecting member 60 connected to the third cylindrical member 40 connects the pipe body 10 to the downstream of the exhaust gas G. In this way, the exhaust gas G is supplied from the upstream connecting member 50 into the pipe body 10.

[0031] The exhaust gas G supplied into the pipe body 10 passes through the first cylindrical member 20, the second cylindrical member 30, and the third cylindrical member 40 in this order, and is discharged to the downstream connecting member 60. When passing through the first cylindrical member 20 and the second cylindrical member 30, the exhaust gas G passes through the first purification member 70 and the second purification member 75. By passing through, the exhaust gas G is purified. The exhaust gas G discharged to the downstream connecting member 60 is discharged to a flow path connected to the downstream connecting member 60.

[0032] The first boss 80 is disposed on the side of the third tubular member 40. In particular, the first boss 80 is provided at the boundary between the third tubular member 40 and the downstream connecting member 60. The first boss 80 is welded to the third tubular member 40 and the downstream connecting member 60 at this boundary. The first boss 80 is a member to be welded. The member to be welded may or may not have a flange. The member to be welded may or may not be configured to protrude inwardly from the third tubular member 40.

[0033] Similarly, the second boss 90 is disposed on the side of the first tubular member 20. In particular, the second boss 90 is provided at the boundary between the first tubular member 20 and the upstream connecting member 50. The second boss 90 is welded to the first tubular member 20 and the upstream connecting member 50 at this boundary.

[0034] The first boss 80 and the second boss 90 are used to attach a sensor (not shown) for measuring parameters of the exhaust gas G, such as the concentration of a measurement target component in the exhaust gas G and the pressure of the exhaust gas G. However, the first boss 80 and the second boss 90 may be used to attach components other than sensors. For example, the first boss 80 and the second boss 90 may be members that form a passage for draining water accumulated in the exhaust system device 1.

[0035] The first boss 80 and the second boss 90 are each configured as a cylindrical part. The pipe 10 has through holes 81 and 91 that communicate from the outside to the inside of the pipe 10. The through holes 81 and 91 can be used to position the tip of a sensor, for example, from the outside to the inside of the pipe 10.

[0036] Fig. 2 shows the peripheral configuration of a first boss 80 provided at the boundary between the third tubular member 40 and the downstream connecting member 60. Fig. 2 shows the peripheral configuration of the first boss 80 in a plan view seen from the outside to the inside in the axial direction of a through hole 81 of the first boss 80.

[0037] In FIG. 2, the main welds around the first boss 80 are indicated by thick lines. The welds indicated by thick lines are formed by fillet welding. Specifically, in FIG. 2, the weld W11 between the third tubular member 40 and the downstream connecting member 60, the weld W12 between the first boss 80 and the third tubular member 40, the weld W13 between the first boss 80 and the downstream connecting member 60, and the weld W17 between the flange 44 and the third tubular member 40 are indicated by thick lines. That is, the weld W11 is formed by welding the third tubular member 40 and the downstream connecting member 60 in a circumferential range excluding the periphery of the first boss 80. The weld W17 is formed by welding the flange 44 and the third tubular member 40 over the entire circumference. In FIG. 2, the portion of the third tubular member 40 hidden from the outside is further indicated by a dashed line. FIG. 3 is a cross-sectional view taken along line III-III of the exhaust system device 1, selectively showing the peripheral configuration of the first boss 80. As shown in FIG.

[0038] The downstream connecting member 60 has an inner diameter at the end 61 that fits into the third tubular member 40 that is larger than the outer diameter around the second open end 42 of the third tubular member 40. Therefore, the downstream connecting member 60 is fitted into the third tubular member 40 so as to cover the side portion of the third tubular member 40 from the outside. Due to this fitting, the downstream connecting member 60 is disposed so as to cover the second open end 42 of the third tubular member 40.

[0039] The downstream connecting member 60 has exhaust holes 69 for discharging the exhaust gas G to the downstream flow passage (see FIG. 1). The second open end 42 of the third tubular member 40 is at least partially covered by the downstream connecting member 60. According to one example, the second open end 42 is substantially entirely covered except for a portion corresponding to the exhaust hole 69.

[0040] As shown in Fig. 4A, the side of the third tubular member 40 has a circular through hole 45 at a position corresponding to the installation location of the first boss 80. Fig. 4A shows a cross section of the side of the third tubular member 40, and shows a cross section parallel to the surface of the side around the installation location of the first boss 80.

[0041] As shown in Fig. 4B, the downstream connecting member 60 has a notch portion 65 having a shape corresponding to the outer edge of the first boss 80 around the location of the first boss 80 at the boundary with the third tubular member 40. The dashed dotted line in Fig. 4B indicates the outer edge shape, i.e., the contour, of the first boss 80. The first boss 80 has a cylindrical outer shape.

[0042] The cutout portion 65 is configured as an arc-shaped cutout portion 65 that is similar in shape to the outer edge of the cylindrical first boss 80. As a result, the cutout portion 65 is configured to be able to accommodate the side surface of the first boss 80 inwardly by half a circumference around the axis of the first boss 80. FIG. 4B shows a cross section of the downstream connecting member 60 around the installation location of the first boss 80, which is parallel to the surface of the downstream connecting member 60. The cutout portion 65 may be configured to be able to accommodate the side surface of the first boss 80 inwardly in a range other than half a circumference. For example, the cutout portion 65 may be configured to be able to accommodate the side surface of the first boss 80 in a range of an arc of less than 180 degrees of the side surface of the first boss 80.

[0043] When welding the first boss 80 to the third tubular member 40, first, as shown in Fig. 5A, the downstream connecting member 60 is fitted to the third tubular member 40. Fig. 5A shows the downstream connecting member 60 fitted to the third tubular member 40 before the first boss 80 is attached. 2. The configuration around the location where the first boss 80 is installed is shown from the same perspective as in FIG. 2. The dashed lines have the same meanings as in FIG.

[0044] 5A, the third tubular member 40 and the downstream connecting member 60 are fitted together to partially overlap each other in a radial direction perpendicular to the axis of the third tubular member 40. That is, when the third tubular member 40 and the downstream connecting member 60 are fitted together, they overlap each other in the radial direction at their boundary.

[0045] During fitting, the notch portion 65 of the downstream connecting member 60 is aligned with the third tubular member 40 so that the through hole 45 of the third tubular member 40 is not covered by the downstream connecting member 60. In other words, the downstream connecting member 60 is fitted into the third tubular member 40 in an aligned state so that the notch portion 65 is disposed around the through hole 45 of the third tubular member 40.

[0046] When the alignment of the through hole 45 and the cutout portion 65 is complete, a hole that communicates with the inside of the third tubular member 40 is formed at a position corresponding to the cutout portion 65. This hole allows a part of the first boss 80 to be inserted into the through hole 45 of the third tubular member 40 from the outside of the downstream connecting member 60 at the boundary between the overlapping third tubular member 40 and the downstream connecting member 60.

[0047] 3, the first boss 80 has a lower portion 80L and an upper portion 80U in the axial direction. The lower portion 80L has a smaller diameter than the upper portion 80U, and the lower portion 80L is disposed inside the tube 10, i.e., the third cylindrical member 40. In other words, the through hole 45 is configured to have an inner diameter that allows the lower portion 80L of the first boss 80 to pass through, but does not allow the upper portion 80U of the first boss 80 to pass through.

[0048] For this reason, when the first boss 80 is inserted into the through hole 45, the periphery of the through hole 45 and an upper portion 80U of the first boss 80 come into contact with each other, and the first boss 80 is supported by the side portion of the third cylindrical member 40. Furthermore, a part of the upper portion 80U of the first boss 80 protruding from the surface of the third cylindrical member 40 is accommodated inside the cutout portion 65.

[0049] 3 and 5A, the arc of the cutout portion 65 has a diameter that is approximately the same as but slightly larger than the outer diameter of the upper portion 80U of the first boss 80. The radius of the arc of the cutout portion 65 is set so that almost no gap is generated between the first boss 80 and the cutout portion 65 for welding the first boss 80 and the cutout portion 65 together.

[0050] 5B shows the peripheral configuration of the first boss 80 after the first boss 80 has been attached and before welding has been performed, from the same perspective as in FIG. 2. As can be understood from a comparison of FIG. 2 and FIG. 5B, the first boss 80 is welded to the third tubular member 40 and the downstream connecting member 60 over the entire circumferential direction thereof, spanning both the third tubular member 40 and the downstream connecting member 60. That is, the first boss 80 is fillet welded to the third tubular member 40 on the circumferential side surface thereof in an area other than the periphery of the notch portion 65, and is fillet welded to the downstream connecting member 60 around the notch portion 65 over the entire circumferential direction of the notch portion 65.

[0051] Fig. 6A shows a VIA-VIA cross section of the peripheral configuration of the first boss 80 shown in Fig. 5B, and Fig. 6B shows a VIB-VIB cross section. In Fig. 6A and Fig. 6B, the welding locations for the first boss 80 are indicated by two-dot chain lines.

[0052] 2, the downstream connecting member 60 is welded to the outer edge of the first boss 80 around the notch 65. The downstream connecting member 60 is welded to the third tubular member 40 in an area of ​​the end 61 that fits with the third tubular member 40, excluding the circumferential notch 65. As a result, the end 61 of the downstream connecting member 60 is welded to the third tubular member 40 in the entire circumferential direction, excluding the notch 65. The notch portion 65 is welded to the third tubular member 40. The notch portion 65 is indirectly fixed to the third tubular member 40 through welding to the first boss 80.

[0053] According to this embodiment, welding of the third tubular member 40 is performed at two locations in the axial direction of the third tubular member 40: around the flange 44 of the third tubular member 40, and at the boundary between the third tubular member 40 and the downstream connecting member 60.

[0054] If the first boss 80 were positioned in the region between the flange 44 and the downstream connecting member 60 rather than at the boundary between the third tubular member 40 and the downstream connecting member 60, the welding locations in the axial direction of the third tubular member 40 would be distributed around the flange 44, around the first boss 80, and around the boundary.

[0055] When welding, a space is required around the welding location to place the torch of the welding machine. Therefore, if the welding locations are dispersed, the third cylindrical member 40 must be designed to be long in order to secure the above-mentioned space, and the exhaust system device 1 becomes large.

[0056] According to this embodiment, as described above, the first boss 80 is disposed at the boundary between the third cylindrical member 40 and the downstream connecting member 60, and the welded parts W12, W13 of the first boss 80 and the welded part W11 between the third cylindrical member 40 and the downstream connecting member 60 are gathered in one place. In this way, by suppressing the dispersion of the welding places, the space required for welding can be suppressed, and it is possible to suppress the increase in size of the exhaust system device 1. In addition, by welding the notch part 65 of the downstream connecting member 60 in the circumferential direction of the first boss 80, the axial direction of the downstream connecting member 60 can be shortened by at least the length equivalent to the radius of the notch part 65, and the increase in size of the exhaust system device 1 can be suppressed.

[0057] The above configuration can also be applied to the upstream side configuration of the exhaust system 1. The second boss 90 corresponds to the first boss 80, the upstream connecting member 50 corresponds to the downstream connecting member 60, and the first cylindrical member 20 corresponds to the third cylindrical member 40.

[0058] 7 shows a cross section of the exhaust system device 1 around the second boss 90. The second boss 90 is provided at the boundary between the upstream connecting member 50 and the first cylindrical member 20, similar to the first boss 80 being provided at the boundary between the downstream connecting member 60 and the third cylindrical member 40. As shown in the figure, the inner diameter of the upstream connecting member 50 is set to be larger than the outer diameter of the first cylindrical member 20.

[0059] Therefore, the upstream connecting member 50 fits into the first tubular member 20 around the first open end 21 of the first tubular member 20 so as to cover the side of the first tubular member 20 from the outside. Due to this fitting, the upstream connecting member 50 and the first tubular member 20 are arranged so as to overlap in the radial direction of the first tubular member 20 at their adjacent ends.

[0060] The first open end 21 of the first cylindrical member 20 is at least partially covered by the upstream connecting member 50. The upstream connecting member 50 has a supply hole 59 for supplying exhaust gas G from the upstream flow passage (see FIG. 1). According to one example, the first open end 21 of the first cylindrical member 20 is substantially entirely covered by the upstream connecting member 50 except for a portion corresponding to the supply hole 59.

[0061] The second boss 90 is disposed at the boundary between the upstream connecting member 50 and the first tubular member 20, where the upstream connecting member 50 and the first tubular member 20 overlap. The first tubular member 20 is provided with a through hole 25, and the upstream connecting member 50 is provided with a notch portion 55 disposed around the through hole 25.

[0062] The notch 55 is provided at the boundary between the upstream connecting member 50 and the first tubular member 20. The cutout portion 55 has a shape corresponding to the outer edge of the cylindrical second boss 90. Specifically, the cutout portion 55 is configured as an arc-shaped cutout portion 55 similar to the outer edge of the second boss 90.

[0063] The second boss 90 has a cylindrical outer shape with an upper portion 90U having a larger diameter than the lower portion 90L, similar to the first boss 80. The second boss 90 is disposed so that its lower portion 90L is disposed in the through hole 25, and further so that the upper portion 90U is partially contained inside the cutout portion 55. Similar to the first boss 80, the second boss 90 is disposed inside the cutout portion 55 for only half of the circumference in the circumferential direction.

[0064] The second boss 90 is welded over the entire circumferential direction at the outer edge of its upper portion 90U. Specifically, the second boss 90 is fillet welded to the upstream connecting member 50 around the notch portion 55, and is fillet welded to the first tubular member 20 in the circumferential direction in an area other than the notch portion 55. The flange 23 disposed on the side of the first tubular member 20 is also fillet welded to the first tubular member 20.

[0065] That is, the second boss 90 has a welded portion W22 with the first tubular member 20 and a welded portion W23 with the notched portion 55 of the upstream connecting member 50. The flange 23 disposed on the side of the first tubular member 20 has a welded portion W27 with the first tubular member 20.

[0066] Thus, on the side of the first tubular member 20, there are a welded portion W27 between the first tubular member 20 and the flange 23, a welded portion W22 between the second boss 90 and the first tubular member 20, and a welded portion W23 between the second boss 90 and the upstream connecting member 50. In addition, there is a welded portion between the first tubular member 20 and the upstream connecting member 50 (not shown).

[0067] In this embodiment, the welded portion between the upstream connecting member 50 and the first cylindrical member 20 and the welded portions W22 and W23 of the second boss 90 can be gathered together in the axial direction of the first cylindrical member 20. Therefore, it is possible to prevent the first cylindrical member 20 from becoming large in size in the axial direction due to the need to secure a space for arranging a torch.

[0068] [Second embodiment] Next, the configuration of the exhaust system device 1 of the second embodiment will be described. However, the exhaust system device 1 of the second embodiment differs from the first embodiment only in the peripheral configuration of the first boss 80. Therefore, in the following, in the exhaust system device 1 of the second embodiment, the same reference numerals are given to the parts of the exhaust system device 1 of the second embodiment that are the same as those of the first embodiment, and the description thereof will be omitted.

[0069] In the exhaust system device 1 of the second embodiment, the third cylindrical member 140 is different from the first embodiment in that it has a semicircular cutout portion 145 instead of the through hole 45. The downstream connecting member 160 that fits with the third cylindrical member 140 has a semicircular cutout portion 165 that is disposed to face the cutout portion 145 of the third cylindrical member 140 in the axial direction of the third cylindrical member 140.

[0070] The first boss 80 is disposed so that a portion of it is inserted into the through hole formed by these two cutout portions 145, 165. The third tubular member 140 and the downstream connecting member 160 of the present embodiment correspond to the third tubular member 40 and the downstream connecting member 60 of the first embodiment.

[0071] 8A shows the peripheral configuration of the first boss 80 disposed at the boundary between the third tubular member 140 and the downstream connecting member 160. FIG. 8A shows the peripheral configuration of the first boss 80 in a plan view seen from the outside to the inside in the axial direction of the first boss 80. FIG. 8B shows the peripheral configuration of the first boss 80 in a plan view seen from the outside to the inside in the axial direction of the first boss 80. The configuration around the location where the first boss 80 is to be installed when the downstream connecting member 160 is fitted to the third cylindrical member 140 before attachment is performed is shown from the same perspective as in FIG. 8A.

[0072] 8A, the welded portion W31 between the third tubular member 140 and the downstream connecting member 160, the welded portion W32 between the first boss 80 and the third tubular member 140, the welded portion W33 between the first boss 80 and the downstream connecting member 160, and the welded portion W37 between the flange 44 and the third tubular member 140 are indicated by thick lines. The welded portions W31, W32, W33, and W37 indicated by thick lines are welded portions formed by fillet welding.

[0073] In Fig. 8A, regions R1 and R2 surrounded by dashed double-dashed lines indicate regions where the third tubular member 140 and the downstream connecting member 160 are butt-welded. In Fig. 8A and Fig. 8B, portions hidden from the outside are further indicated by dashed lines. Fig. 9 is a cross-sectional view of the exhaust system device 1 taken along line IX-IX, selectively showing the configuration around the first boss 80.

[0074] 10A shows a cross section of the side of the third tubular member 140, parallel to the surface of the side around the location of the first boss 80. FIG 10B shows a cross section of the downstream connecting member 160, parallel to the surface of the downstream connecting member 160 around the location of the first boss 80.

[0075] The downstream connecting member 160 has an inner diameter at the end 161 that fits with the third tubular member 140 that is larger than the outer diameter around the second opening end 142 of the third tubular member 140. Therefore, the downstream connecting member 160 is fitted into the third tubular member 140 around the second opening end 142 of the third tubular member 140 so as to cover the side of the third tubular member 140 from the outside. Due to this fitting, the downstream connecting member 160 is disposed so as to cover the second opening end 142 of the third tubular member 140.

[0076] At the boundary between the downstream connecting member 160 and the third tubular member 140 which are fitted together, the downstream connecting member 160 and the third tubular member 140 overlap in a radial direction perpendicular to the axial direction of the third tubular member 140.

[0077] However, the notch 165 of the downstream connecting member 160 is formed in a region R3 recessed from the surroundings. That is, the notch 165 of the downstream connecting member 160 is formed in the region R3 of the downstream connecting member 160 recessed in a direction approaching the central axis of the third tubular member 140. Therefore, when the downstream connecting member 160 is fitted to the third tubular member 140, the notch 165 of the downstream connecting member 160 is disposed at the same height as the notch 145 of the third tubular member 140. The same height refers to the height from the axis of the pipe when the periphery of the first boss 80 is viewed from the tangential direction of the pipe in a cross section along the axial direction of the pipe (the downstream connecting member 160 and the third tubular member 140), for example, as shown in FIG.

[0078] According to this embodiment, when the downstream connecting member 160 is engaged with the third tubular member 140 in this manner, the cutout portion 165 of the downstream connecting member 160 and the cutout portion 145 of the third tubular member 140 are positioned to face each other at the same height, so that a through hole for attaching the first boss 80, which corresponds to the through hole of the first embodiment, is formed between the two cutout portions 145, 165.

[0079] The through hole formed by the two cutout portions 145, 165 has an inner diameter that allows the lower portion 80L of the first boss 80 to pass therethrough, but does not allow the upper portion 80U of the first boss 80 to pass therethrough. For this reason, as shown in Fig. 9, when the first boss 80 is inserted into the through hole, the periphery of the through hole comes into contact with the upper portion 80U of the first boss 80, and the first boss 80 is supported by the third tubular member 140 and the downstream connecting member 160 around the through hole.

[0080] According to this embodiment, before the first boss 80 is installed, when the downstream connecting member 160 is fitted into the third tubular member 140, the third tubular member 140 and the downstream connecting member 160 are butt-welded to each other in regions R1, R2 where the third tubular member 140 and the downstream connecting member 160 contact each other at the same height around the notch portion 145 of the third tubular member 140 and the notch portion 165 of the downstream connecting member 160. That is, the third tubular member 140 and the downstream connecting member 160 are butt-welded to each other around the notch portions 145, 165.

[0081] Thereafter, the first boss 80 is inserted into the through hole between the two notches 145, 165, thereby being positioned at the boundary between the third tubular member 140 and the downstream connecting member 160. Furthermore, fillet welding is performed along the outer edge of the first boss 80, so that the outer edge of the first boss 80 is welded to the downstream connecting member 160 around the notch 165, and is further welded to the third tubular member 140 around the notch 145.

[0082] Furthermore, in a region where the third tubular member 140 and the downstream connecting member 160 overlap in the radial direction due to the fitting, the end portion 161 of the downstream connecting member 160 and the third tubular member 140 are fillet welded together.

[0083] In this embodiment, as in the first embodiment, the welded portion W31 between the third tubular member 140 and the downstream connecting member 160, the welded portion W32 between the first boss 80 and the third tubular member 140, and the welded portion W33 between the first boss 80 and the downstream connecting member 160 can be gathered in one place by fillet welding. Therefore, the space required for welding can be reduced, and it is possible to prevent the exhaust system device 1 from becoming large. In the second embodiment, too, the downstream configuration of the exhaust system device 1 can be applied to the upstream configuration.

[0084] [Other embodiments] The present disclosure is not limited to the above-described embodiment, and can adopt various aspects. For example, in the first and second embodiments described above, the downstream connecting members 60, 160 are fitted to the third tubular members 40, 140 so as to cover the side portions of the third tubular members 40, 140 from the radially outer side.

[0085] However, the exhaust system device 1 may be configured so that the third tubular member 40, 140 fits with the downstream connecting member 60, 160 by covering the side portion of the downstream connecting member 60, 160 from the radially outer side. In this case, a notch having a symmetrical shape to the notch 65 shown in Fig. 4B may be provided in the second open end 42 of the third tubular member 40, and a through hole corresponding to the through hole 45 aligned with the notch may be provided in the downstream connecting member 60.

[0086] The welded member may be a member that is not disposed inside the tube, but is attached to the side surface of the tube, and may be, for example, a bracket. The welded member may be welded to at least one of the tubular member and the connecting member. The welded member may be welded linearly or continuously to at least one of the tubular member and the connecting member, or may be welded discretely at intervals. For example, the welded member may be welded to the tubular member and / or the connecting member entirely around its periphery, or may be welded to the tubular member and / or the connecting member partially or discretely.

[0087] In addition, the exhaust system device 1 may be configured as a silencer. The function of one component in the above embodiments may be distributed among multiple components. The functions of multiple components may be integrated into one component. Part of the configuration of the above embodiments may be omitted. 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. All aspects included in the technical idea identified from the wording recited in the claims are embodiments of the present disclosure.

[0088] [Technical idea disclosed in this specification] It can be understood that the present specification discloses the following technical ideas. [Item 1] A tubular member configured to allow exhaust gas to flow through it; a connecting member connected to the tubular member so as to at least partially cover an open end of the tubular member; A workpiece to be welded is disposed on a side portion of the tubular member; Equipped with the connecting member is connected to the tubular member by welding, At least one of the tubular member and the connecting member is provided with a notch portion having a shape corresponding to an outer edge of the welded member at a boundary between the tubular member and the connecting member, An exhaust system device in which the welded member is positioned at the boundary between the tubular member and the connecting member so as to be partially contained inside the cutout portion, and is welded to at least one of the tubular member and the connecting member. [Item 2] 2. The exhaust system device according to claim 1, wherein the welded member is welded to the tubular member and the connecting member around the periphery of the welded member or around the periphery of the cutout portion. [Item 3] the cylindrical member is a case that houses an exhaust gas purification member therein, the workpiece is a boss for attaching a component to the inside of the tubular member, 3. The exhaust system device according to claim 1, wherein a hole leading to an inside of the cylindrical member is formed at a boundary between the cylindrical member and the connecting member at a position corresponding to the cutout or outside the cutout. [Item 4] The workpiece has a cylindrical outer shape, 4. The exhaust system device according to any one of claims 1 to 3, wherein the cutout portion is an arc-shaped cutout portion similar to an outer edge of the member to be welded. [Item 5] the connecting member is connected to the tubular member so as to cover a side portion of the tubular member from the outside around the open end, 5. The exhaust system device according to any one of claims 1 to 4, wherein the cutout portion is provided at least in the connecting member. [Item 6] 6. The exhaust system device according to any one of claims 1 to 5, wherein the tubular member and the connecting member are butt-welded to each other around the notch. [Explanation of symbols]

[0089] 1...exhaust system device, 10...tube body, 20...first cylindrical member, 21,31,41...first opening end, 22,32,42,142...second opening end, 23,33,34,44...flange, 25,45...through hole, 30...second cylindrical member, 40,140...third cylindrical member, 50...upstream connecting member, 55,65,145,165...notch portion, 60,160...downstream connecting member, 61,161...end portion, 70...first purification member, 75...second purification member, 80...first boss, 81,91...through hole, 90...second boss, W11,W12,W13,W17,W22,W23,W27,W31,W32,W33,W37...welded portion.

Claims

1. A tubular member configured to allow exhaust gas to flow through it; a connecting member connected to the tubular member so as to at least partially cover an open end of the tubular member; A workpiece to be welded is disposed on a side portion of the tubular member; Equipped with the connecting member is connected to the tubular member by welding, At least one of the tubular member and the connecting member is provided with a notch portion having a shape corresponding to an outer edge of the welded member at a boundary between the tubular member and the connecting member, An exhaust system device in which the welded member is positioned at the boundary between the tubular member and the connecting member so as to be partially contained inside the cutout portion, and is welded to at least one of the tubular member and the connecting member.

2. 2. The exhaust system device according to claim 1, wherein the welded member is welded to the tubular member and the connecting member around its periphery.

3. the cylindrical member is a case that houses an exhaust gas purification member therein, the workpiece is a boss for attaching a component to the inside of the tubular member, 2. The exhaust system device according to claim 1, wherein a hole communicating with an inside of the cylindrical member is formed at a boundary between the cylindrical member and the connecting member at a position corresponding to the notch.

4. The workpiece has a cylindrical outer shape, 2. The exhaust system device according to claim 1, wherein the cutout portion is an arc-shaped cutout portion similar to an outer edge of the workpiece.

5. the connecting member is connected to the tubular member so as to cover a side portion of the tubular member from the outside around the open end, The exhaust system device according to any one of claims 1 to 4, wherein the cutout portion is provided at least in the connecting member.

6. 5. The exhaust system device according to claim 1, wherein the tubular member and the connecting member are butt-welded to each other around the notch.

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