Exhaust system

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 an exhaust system device.

Background Art

[0002] In an exhaust system device through which exhaust gas of an internal combustion engine flows, a sensor for detecting components of the exhaust gas is arranged. This sensor is attached to the exhaust system device via a boss (see Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

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

[0005] Therefore, according to one aspect of the present disclosure, it is desirable to provide a technology capable of suppressing the enlargement of the exhaust system device due to the space required for welding.

Means for Solving the Problems

[0006] An exhaust system device according to one aspect of the present disclosure includes a cylindrical member, a connecting member, and a welded member. The cylindrical member is configured such that exhaust gas flows through it. The connecting member is connected to the cylindrical member so as to at least partially cover the open end of the cylindrical member. The welded member is arranged on the side portion of the cylindrical member.

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

[0008] Conventionally, welding of the component to be welded to the cylindrical component, and welding of the cylindrical component to the connecting component, were performed at separate points along the axial direction of the cylindrical component. Therefore, space had to be secured between these welding points. This was a cause of the exhaust system becoming larger in the axial direction.

[0009] According to one aspect of the exhaust system configuration of this disclosure, the welding points between the cylindrical member and the connecting member, and the welding points between the cylindrical member and at least one of the connecting member of the member to be welded, can be consolidated into a single area in the axial direction of the cylindrical member. Therefore, it is not necessary to secure space required for welding at multiple spaced points as in the conventional method. Consequently, this exhaust system makes it possible to suppress the increase in size of the exhaust system due to the space required for welding.

[0010] According to one aspect of this disclosure, the member to be welded can be welded to a cylindrical member and a connecting member. According to one aspect of this disclosure, the member to be welded can be welded to the cylindrical member and the connecting member around its periphery or around a notch. Such welding allows the member to be welded to be properly secured to the cylindrical member and the connecting member.

[0011] According to one aspect of this disclosure, the cylindrical member may be a case that houses a purifying member for exhaust gases. The member to be welded may be a boss for attaching a component to the inside of the cylindrical member. A hole leading to the inside of the cylindrical member may be formed at the boundary between the cylindrical member and the connecting member, either at a position corresponding to a notch or outside the notch. With this configuration, welding of the boss and welding of the cylindrical member and the connecting member can be performed efficiently.

[0012] According to one aspect of this disclosure, the member to be welded may have a cylindrical outer shape. The notch may be an arc-shaped notch similar to the outer edge of the member to be welded.

[0013] According to one aspect of this disclosure, the connecting member can be connected to a cylindrical member such that it covers the side of the cylindrical member from the outside around the open end. In this case, at least a notch can be provided in the connecting member. With this configuration, welding between the member to be welded and the notch can be easily performed from the outside of the cylindrical member and the connecting member.

[0014] According to one aspect of this disclosure, the cylindrical member and the connecting member may be butt-welded to each other around the notch. This configuration makes it possible to increase the joint strength between the cylindrical member and the connecting member around the notch. [Brief explanation of the drawing]

[0015] [Figure 1] This is a plan view showing the schematic configuration of the exhaust system. [Figure 2] This is a plan view showing the configuration around the first boss in the exhaust system of the first embodiment. [Figure 3] This is a cross-sectional view of the exhaust system, line III-III. [Figure 4] Figure 4A shows a cross-section parallel to the surface of the third cylindrical member around the installation location of the first boss, and Figure 4B shows a cross-section parallel to the surface of the downstream connecting member around the same installation location. [Figure 5] Figure 5A is a plan view showing the configuration around the installation location of the first boss in the exhaust system before the first boss is installed, and Figure 5B is a plan view showing the configuration around the first boss in the exhaust system before welding. [Figure 6] Figure 6A is a VIA-VIA cross-sectional view of the exhaust system around the first boss, and Figure 6B is a VIB-VIB cross-sectional view of the exhaust system around the first boss. [Figure 7]It is a cross-sectional view showing the configuration around the second boss in the exhaust system device. [Figure 8] FIG. 8A is a plan view showing the configuration around the first boss in the exhaust system device of the second embodiment, and FIG. 8B is a plan view showing the configuration around the installation location of the boss in the exhaust system device before the first boss is installed. [Figure 9] It is a cross-sectional view taken along the IX - IX line of the exhaust system device of the second embodiment. [Figure 10] FIG. 10A is a view showing a cross-section parallel to the surface of the third cylindrical member around the installation location of the first boss with respect to the second embodiment, and FIG. 10B is a view showing a cross-section parallel to the surface of the downstream connecting member around the installation location.

Mode for Carrying Out the Invention

[0016] Hereinafter, exemplary embodiments of the present disclosure will be described with reference to the drawings. [First Embodiment] The exhaust system device 1 of the present embodiment shown in FIG. 1 is connected to the flow path of the exhaust gas G generated by 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, and a second boss 9 0. <000092> The internal combustion engine connected to this exhaust system device 1 is not particularly limited. Examples of the internal combustion engine include those used for driving or power generation in transportation equipment such as automobiles, railways, ships, and construction machinery, 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 open.

[0019] The first cylindrical member 20 is connected to the upstream connecting member 50 around the first open end 21. Specifically, the first cylindrical member 20 fits into the upstream connecting member 50. While fitted into the upstream connecting member 50, the first cylindrical 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 Figure 1, parts hidden from view are shown by dashed lines.

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

[0021] The side portion of the cylindrical member referred to here corresponds to the part that constitutes the outer shape of the cylindrical member, located circumferentially around the axis extending from the first open end to the second open end of the cylindrical member. The flange 23 is welded to the side portion of the first cylindrical member 20.

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

[0023] A flange 34 for connecting to the third cylindrical member 40 is provided on the side of the second cylindrical member 30, around the second open end 32 opposite to the first open end 31. A flange 44 for connecting to the second cylindrical member 30 is provided on the side of the third cylindrical member 40, around the first open end 41 adjacent to the second cylindrical member 30. The second cylindrical member 30 and the third cylindrical member 40 are connected to each other through these flanges 34, 44. The means of connecting the flanges 34, 44 are not limited to bolts, but may include bolts.

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

[0025] The first cylindrical member 20 holds the first purification member 70 inside. The second cylindrical member 30 holds the second purification member 75 inside. 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 exhaust gas G, respectively. Although not shown in the figures, an elastic member is placed between the first cylindrical member 20 and the first purification member 70. Similarly, an elastic member is placed 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 modify or collect environmental pollutants in the exhaust gas G, or to modify and collect them. The first purification member 70 and the second purification member 75 may be different types of purification members. The first purification member 70 and the second purification member 75 may be the same type of purification member.

[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 component 70 and the second purification component 75 include diesel oxidation catalysts (DOC), diesel particulate filters (DPF), gasoline particulate filters (GPF), and NOx adsorbents.

[0028] DOC is a catalyst that oxidizes soluble organic compounds (SOF), CO, and HC in PM contained in exhaust gas G. DPF and GPF are filters that capture PM contained in exhaust gas G. NOx adsorbents are substances that adsorb and remove NOx.

[0029] For example, the exhaust system device 1 is provided with a DOC as the first purification member 70 and a DPF as the second purification member 75. No purification member is placed inside the third cylindrical member 40. However, a purification member may be placed inside the third cylindrical member 40 if it does not affect welding.

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

[0031] The exhaust gas G supplied into the pipe 10 passes through the first cylindrical member 20, the second cylindrical member 30, and the third cylindrical member 40 in order, and is discharged to the downstream connecting member 60. As the exhaust gas G passes through the first cylindrical member 20 and the second cylindrical member 30, it also passes through the first purification member 70 and the second purification member 75. Through this passage, the exhaust gas G is purified. The exhaust gas G discharged to the downstream connecting member 60 is then discharged into the flow path connected to the downstream connecting member 60.

[0032] The first boss 80 is positioned on the side of the third cylindrical member 40. More specifically, the first boss 80 is provided at the boundary between the third cylindrical member 40 and the downstream connecting member 60. The first boss 80 is welded to the third cylindrical member 40 and the downstream connecting member 60 at this boundary. The first boss 80 is the 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 protrude inward from the third cylindrical member 40.

[0033] Similarly, the second boss 90 is positioned on the side of the first cylindrical member 20. More specifically, the second boss 90 is located at the boundary between the first cylindrical member 20 and the upstream connecting member 50. The second boss 90 is welded to the first cylindrical member 20 and the upstream connecting member 50 at this boundary.

[0034] The first boss 80 and the second boss 90 are used to mount sensors (not shown) for measuring parameters of exhaust gas G, such as the concentration of target components of exhaust gas G and the pressure of exhaust gas G. However, the first boss 80 and the second boss 90 may also be used to mount 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 cylindrical parts, and the tube body 10 It has through holes 81 and 91 that lead from the outside to the inside of the pipe 10. The through holes 81 and 91 can be used, for example, to position the tip of a sensor from the outside to the inside of the pipe 10.

[0036] Figure 2 shows the peripheral configuration of the first boss 80, which is provided at the boundary between the third cylindrical member 40 and the downstream connecting member 60. Figure 2 is a plan view of the first boss 80, looking from the outside to the inside in the axial direction of the through hole 81 of the first boss 80, and represents the peripheral configuration of the first boss 80.

[0037] In Figure 2, the main welds around the first boss 80 are shown by thick lines. The welds shown by thick lines are formed by fillet welding. Specifically, in Figure 2, the welds W11 between the third cylindrical member 40 and the downstream connecting member 60, W12 between the first boss 80 and the third cylindrical member 40, W13 between the first boss 80 and the downstream connecting member 60, and W17 between the flange 44 and the third cylindrical member 40 are shown by thick lines. That is, weld W11 is formed by welding the third cylindrical member 40 and the downstream connecting member 60 in a circumferential area excluding the area around the first boss 80. Weld W17 is formed by welding the flange 44 and the third cylindrical member 40 around the entire circumference. In Figure 2, the parts of the third cylindrical member 40 that are hidden from view are shown by dashed lines. Figure 3 is a cross-sectional view of the exhaust system 1 along line III-III, selectively showing the peripheral configuration of the first boss 80.

[0038] The downstream connecting member 60 has an inner diameter at its end portion 61, which engages with the third cylindrical member 40, that is larger than the outer diameter around the second open end 42 of the third cylindrical member 40. Therefore, the downstream connecting member 60 is fitted onto the third cylindrical member 40 so as to cover its side from the outside. This fitting ensures that the downstream connecting member 60 is positioned to cover the second open end 42 of the third cylindrical member 40.

[0039] The downstream connecting member 60 is provided with an exhaust hole 69 for discharging exhaust gas G into the downstream flow path (see Figure 1). The second open end 42 of the third cylindrical member 40 is at least partially covered by the downstream connecting member 60. In one example, the second open end 42 is covered substantially entirely, except for the portion corresponding to the exhaust hole 69.

[0040] As shown in Figure 4A, the side of the third cylindrical member 40 is provided with a circular through hole 45 at a position corresponding to the installation location of the first boss 80. Figure 4A is a cross-section of the side of the third cylindrical member 40, showing a cross-section parallel to the surface of the side around the installation location of the first boss 80.

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

[0042] The notch 65 is configured as an arc-shaped notch 65 that is similar in shape to the outer edge of the cylindrical first boss 80, and is aligned with the outer edge of the first boss 80. As a result, the notch 65 is configured to accommodate the side surface of the first boss 80 by half a turn around the axis of the first boss 80. Figure 4B is a cross-section of the downstream connecting member 60 around the installation location of the first boss 80, showing a cross-section parallel to the surface of the downstream connecting member 60. The notch 65 may be configured to accommodate the side surface of the first boss 80 in a range other than half a turn. For example, the notch 65 may be configured to accommodate the side surface of the first boss 80 within an arc range of less than 180 degrees.

[0043] When welding the first boss 80 to the third cylindrical member 40, first, as shown in Figure 5A, the downstream connecting member 60 is fitted onto the third cylindrical member 40. Figure 5A shows the downstream connecting member 60 fitted onto the third cylindrical member 40 before the first boss 80 is attached. The configuration around the location of the first boss 80 is shown from the same viewpoint as in Figure 2. The meaning of the dashed lines is the same as in Figure 2.

[0044] As shown in Figure 5A, the third cylindrical member 40 and the downstream connecting member 60 partially overlap in the radial direction perpendicular to the axis of the third cylindrical member 40 when fitted together. That is, when the third cylindrical member 40 and the downstream connecting member 60 are fitted together, they overlap radially at their boundary.

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

[0046] When the through-hole 45 and the notch 65 are aligned, a hole is formed at the position corresponding to the notch 65 that leads to the inside of the third cylindrical member 40. This hole allows a portion of the first boss 80 to be inserted into the through-hole 45 of the third cylindrical member 40 from the outside of the downstream connecting member 60 at the boundary between the overlapping third cylindrical member 40 and the downstream connecting member 60.

[0047] As shown in Figure 3, the first boss 80 has a lower part 80L and an upper part 80U in the axial direction. The lower part 80L has a smaller diameter than the upper part 80U, and the lower part 80L is located inside the pipe body 10, i.e., the third cylindrical member 40. In other words, the through hole 45 is configured to have an inner diameter that allows it to pass through the lower part 80L of the first boss 80, but not through the upper part 80U of the first boss 80.

[0048] Therefore, when the first boss 80 is inserted into the through hole 45, the area around the through hole 45 and the upper part 80U of the first boss 80 come into contact, and the first boss 80 is supported on the side of the third cylindrical member 40. Furthermore, a portion of the upper part 80U of the first boss 80 that protrudes from the surface of the third cylindrical member 40 is housed inside the notch 65.

[0049] As can be seen from Figures 3 and 5A, the arc of the notch 65 has a diameter that is approximately the same as, but slightly larger than, the outer diameter of the upper part 80U of the first boss 80. The radius of the arc of the notch 65 is set so that there is almost no gap between the first boss 80 and the notch 65 for welding.

[0050] Figure 5B shows the peripheral configuration of the first boss 80 after it has been installed but before welding, from the same viewpoint as in Figure 2. As can be seen from comparing Figure 2 and Figure 5B, the first boss 80 is welded to the third cylindrical member 40 and the downstream connecting member 60 over its entire circumferential length, spanning both the third cylindrical member 40 and the downstream connecting member 60. That is, the first boss 80 is fillet welded to the third cylindrical member 40 on its circumferential side surface, except around the notch 65, and fillet welded to the downstream connecting member 60 over its entire circumferential length around the notch 65.

[0051] Figure 6A shows a via-via cross-section of the peripheral configuration of the first boss 80 shown in Figure 5B, and Figure 6B shows a via-via-via cross-section. In Figures 6A and 6B, the welding locations to the first boss 80 are indicated by dashed lines.

[0052] As can be seen from Figure 2, the downstream connecting member 60 is welded to the outer edge of the first boss 80 around the notch 65. At the end 61 that engages with the third cylindrical member 40, the downstream connecting member 60 is welded to the third cylindrical member 40 in the area excluding the circumferential notch 65. As a result, the end 61 of the downstream connecting member 60 is welded over the entire circumferential direction excluding the notch 65. The notch 65 is welded to the third cylindrical member 40. The notch 65 is indirectly fixed to the third cylindrical member 40 through welding to the first boss 80.

[0053] According to this embodiment, welding of the third cylindrical member 40 is performed at two locations in the axial direction of the third cylindrical member 40: around the flange 44 of the third cylindrical member 40 and at the boundary between the third cylindrical 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 cylindrical member 40 and the downstream connecting member 60, the welding locations in the axial direction of the third cylindrical member 40 would be distributed around the flange 44, around the first boss 80, and around the aforementioned boundary.

[0055] During welding, space is required around the welding area to position the welding machine torch. Therefore, if the welding areas are dispersed, the third cylindrical member 40 must be designed to be longer in order to secure the above space, which leads to an increase in the size of the exhaust system 1.

[0056] According to this embodiment, as described above, the first boss 80 is positioned at the boundary between the third cylindrical member 40 and the downstream connecting member 60, and the welded portions W12 and W13 of the first boss 80 and the welded portion W11 between the third cylindrical member 40 and the downstream connecting member 60 are combined in one place. By suppressing the dispersion of welding locations in this way, the space required for welding can be reduced, and the size of the exhaust system device 1 can be suppressed. Furthermore, by welding the notch 65 of the downstream connecting member 60 in the circumferential direction of the first boss 80, the axial length of the downstream connecting member 60 can be shortened by at least a length equivalent to the radius of the notch 65, thereby suppressing the size of the exhaust system device 1.

[0057] The above configuration can also be applied to the upstream configuration of the exhaust system device 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] Figure 7 shows a cross-section of the exhaust system 1 around the second boss 90. The second boss 90 is located at the boundary between the upstream connecting member 50 and the first cylindrical member 20, similar to how the first boss 80 is located 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 with the first cylindrical member 20 so as to cover the side of the first cylindrical member 20 from the outside around the first open end 21 of the first cylindrical member 20. This fitting causes the upstream connecting member 50 and the first cylindrical member 20 to overlap in the radial direction of the first cylindrical 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 includes a supply hole 59 for supplying exhaust gas G from the upstream flow path (see Figure 1). In one example, the first open end 21 of the first cylindrical member 20 is almost entirely covered by the upstream connecting member 50, except for the portion corresponding to the supply hole 59.

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

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

[0063] The second boss 90, like the first boss 80, has a cylindrical outer shape in which the upper part 90U has a larger diameter than the lower part 90L. The second boss 90 is positioned such that its lower part 90L is positioned in the through hole 25, and furthermore, its upper part 90U is partially housed inside the notch 55. The second boss 90, like the first boss 80, is positioned inside the notch 55 for only half a turn in the circumferential direction.

[0064] The second boss 90 is welded along its entire circumferential length at the outer edge of its upper part 90U. Specifically, the second boss 90 is fillet welded to the upstream connecting member 50 around the notch 55, and fillet welded to the first cylindrical member 20 in the circumferential region other than the notch 55. The flange 23 positioned on the side of the first cylindrical member 20 is also fillet welded to the first cylindrical member 20.

[0065] In other words, the second boss 90 has a welded portion W22 with the first cylindrical member 20 and a welded portion W23 with the notch 55 of the upstream connecting member 50. The flange 23 positioned on the side of the first cylindrical member 20 has a welded portion W27 with the first cylindrical member 20.

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

[0067] In this embodiment, the welded portion of 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 combined in the axial direction of the first cylindrical member 20. Therefore, it is possible to suppress the axial enlargement of the first cylindrical member 20 due to the need to secure space for the torch.

[0068] [Second Embodiment] Next, the configuration of the exhaust system 1 of the second embodiment will be described. However, the exhaust system 1 of the second embodiment differs from the first embodiment only in the configuration around the first boss 80. Therefore, in the following, the same reference numerals are used for parts of the exhaust system 1 of the second embodiment that have the same configuration as those of the first embodiment, and their descriptions are omitted.

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

[0070] The first boss 80 is positioned such that a portion of it is inserted into the through-hole formed by these two notches 145 and 165. The third cylindrical member 140 and downstream connecting member 160 in this embodiment correspond to the third cylindrical member 40 and downstream connecting member 60 in the first embodiment.

[0071] Figure 8A shows the peripheral configuration of the first boss 80, which is located at the boundary between the third cylindrical member 140 and the downstream connecting member 160. Figure 8A is a plan view of the first boss 80, seen from the outside to the inside in the axial direction of the first boss 80, showing the peripheral configuration of the first boss 80. Figure 8B shows the first boss 80 The configuration around the installation location of the first boss 80, when the downstream connecting member 160 is fitted into the third cylindrical member 140 before installation, is shown from the same viewpoint as in Figure 8A.

[0072] In Figure 8A, the welds W31 between the third cylindrical member 140 and the downstream connecting member 160, W32 between the first boss 80 and the third cylindrical member 140, W33 between the first boss 80 and the downstream connecting member 160, and W37 between the flange 44 and the third cylindrical member 140 are shown by thick lines. The welds W31, W32, W33, and W37 shown by thick lines are welds formed by fillet welding.

[0073] In Figure 8A, the regions R1 and R2 enclosed by the dashed lines indicate the areas where the third cylindrical member 140 and the downstream connecting member 160 are butt-welded. In Figures 8A and 8B, parts hidden from view are further indicated by dashed lines. Figure 9 is a cross-sectional view of the exhaust system device 1 taken from line IX-IX, selectively showing the peripheral configuration of the first boss 80.

[0074] In addition, Figure 10A shows a cross-section of the side of the third cylindrical member 140, showing a cross-section parallel to the surface of the side around the installation location of the first boss 80. Figure 10B shows a cross-section of the downstream connecting member 160 around the installation location of the first boss 80, showing a cross-section parallel to the surface of the downstream connecting member 160.

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

[0076] At the boundary between the mutually fitted downstream connecting member 160 and the third cylindrical member 140, the downstream connecting member 160 and the third cylindrical member 140 overlap in the radial direction perpendicular to the axial direction of the third cylindrical member 140.

[0077] However, the notch 165 of the downstream connecting member 160 is formed in a recessed area R3. That is, the notch 165 of the downstream connecting member 160 is formed in a recessed area R3 of the downstream connecting member 160 that approaches the central axis of the third cylindrical member 140. Therefore, when the downstream connecting member 160 is fitted with the third cylindrical member 140, the notch 165 of the downstream connecting member 160 is positioned at the same height as the notch 145 of the third cylindrical member 140. The same height means, for example, as shown in Figure 9, the height from the axis of the pipe when the area around the first boss 80 is viewed from the tangential direction of the pipe in a cross-section along the axial direction of the pipe (downstream connecting member 160 and third cylindrical member 140).

[0078] According to this embodiment, when the downstream connecting member 160 is fitted into the third cylindrical member 140 in this manner, the notch 165 of the downstream connecting member 160 and the notch 145 of the third cylindrical member 140 are positioned to face each other at the same height, thereby forming a through hole for mounting the first boss 80, which corresponds to the through hole in the first embodiment, between the two notches 145 and 165.

[0079] The through-hole formed by the two notches 145 and 165 has an inner diameter that allows the lower part 80L of the first boss 80 to pass through, but does not allow the upper part 80U of the first boss 80 to pass through. Therefore, as shown in Figure 9, when the first boss 80 is inserted into the through-hole, the periphery of the through-hole and the upper part 80U of the first boss 80 come into contact, and the first boss 80 is supported around the through-hole by the third cylindrical member 140 and the downstream connecting member 160.

[0080] According to this embodiment, before the first boss 80 is installed, when the downstream connecting member 160 is fitted into the third cylindrical member 140, the third cylindrical member 140 and the downstream connecting member 160 are butt-welded in areas R1 and R2 where they contact each other at the same height around the notches 145 of the third cylindrical member 140 and 165 of the downstream connecting member 160. In other words, the third cylindrical member 140 and the downstream connecting member 160 are butt-welded to each other around the notches 145 and 165.

[0081] Subsequently, the first boss 80 is inserted into the through hole between the two notches 145 and 165, thereby positioning it at the boundary between the third cylindrical 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 further welded to the third cylindrical member 140 around the notch 145.

[0082] Furthermore, in the region where the third cylindrical member 140 and the downstream connecting member 160 overlap radially due to the fitting, the end 161 of the downstream connecting member 160 and the third cylindrical member 140 are fillet welded.

[0083] In this embodiment as well, similar to the first embodiment, with respect to fillet welding, the weld W31 between the third cylindrical member 140 and the downstream connecting member 160, the weld W32 between the first boss 80 and the third cylindrical member 140, and the weld W33 between the first boss 80 and the downstream connecting member 160 can be combined into one location. Therefore, the space required for welding can be reduced, and the size of the exhaust system device 1 can be kept down. In the second embodiment as well, the downstream configuration of the exhaust system device 1 can be applied to the upstream configuration.

[0084] [Other embodiments] This disclosure is not limited to the embodiments described above, and various other embodiments are possible. For example, in the first and second embodiments described above, the downstream connecting members 60 and 160 are fitted to the third cylindrical members 40 and 140 such that they cover the sides of the third cylindrical members 40 and 140 from the radially outer side.

[0085] However, the exhaust system device 1 may be configured such that the third cylindrical members 40, 140 fit with the downstream connecting members 60, 160 by covering the sides of the downstream connecting members 60, 160 from the radially outer side. In this case, the second open end 42 of the third cylindrical member 40 is provided with a notch that is symmetrical to the notch 65 shown in Figure 4B, and the downstream connecting member 60 may be provided with a through hole corresponding to the through hole 45 that is aligned with this notch.

[0086] The member to be welded may not be located inside the pipe but may be attached to the side of the pipe, for example, a bracket. The member to be welded may be welded to at least one of the cylindrical member and the connecting member. The member to be welded may be welded linearly or continuously to at least one of the cylindrical member and the connecting member, or it may be welded discretely at intervals. For example, the member to be welded may be welded all around its periphery to the cylindrical member and / or the connecting member, or it may be welded partially or discretely to the cylindrical member and / or the connecting member.

[0087] In addition, the exhaust system 1 may be configured as a silencer. The function of one component in the above embodiment may be distributed among multiple components. The functions of multiple components may be integrated into one component. Some of the configurations of the above embodiment may be omitted. At least some of the configurations of the above embodiment may be added to or replaced with the configurations of other above embodiments. Any aspect of the technical concept specified by the wording of the claims constitutes an embodiment of the present disclosure.

[0088] [Technical Concept Disclosed in This Specified Specification] This specification can be understood to disclose the following technical concepts: [Item 1] A cylindrical member configured to allow exhaust gas to flow, A connecting member connected to the cylindrical member so as to at least partially cover the open end of the cylindrical member, The member to be welded is positioned on the side of the cylindrical member, Equipped with, The connecting member is connected to the cylindrical member by welding. At least one of the cylindrical member and the connecting member is provided with a notch at the boundary between the cylindrical member and the connecting member having a shape corresponding to the outer edge of the member to be welded, An exhaust system device in which the member to be welded is positioned at the boundary between the cylindrical member and the connecting member so as to be partially housed inside the notch, and is welded to at least one of the cylindrical member and the connecting member. [Item 2] The exhaust system according to item 1, wherein the member to be welded is welded with the cylindrical member and the connecting member around its periphery or around the notch. [Item 3] The cylindrical member is a case that houses the exhaust gas purification member on its inside. The member to be welded is a boss for attaching a component to the inside of the cylindrical member, The exhaust system according to item 1 or item 2, wherein a hole leading to the inside of the cylindrical member is formed at the boundary between the cylindrical member and the connecting member, either at a position corresponding to the notch or outside the notch. [Item 4] The member to be welded has a cylindrical outer shape, The exhaust system device according to any one of items 1 to 3, wherein the notch is an arc-shaped notch similar to the outer edge of the member to be welded. [Item 5] The connecting member is connected to the cylindrical member such that it covers the side of the cylindrical member from the outside around the open end. The aforementioned notch is provided in the connecting member as an exhaust system according to any one of items 1 to 4. [Item 6] The exhaust system according to any one of items 1 to 5, wherein the cylindrical member and the connecting member are butt-welded to each other around the notch. [Explanation of Symbols]

[0089] 1...Exhaust system device, 10...Pipe body, 20...First cylindrical member, 21, 31, 41...First open end, 22, 32, 42, 142...Second open 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, 60, 160...Downstream connecting member, 61, 161...End, 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 part.

Claims

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

2. The exhaust system device according to claim 1, wherein the member to be welded is welded with the cylindrical member and the connecting member around it.

3. The cylindrical member is a case that houses the exhaust gas purification member on its inside. The member to be welded is a boss for attaching a component to the inside of the cylindrical member, The exhaust system device according to claim 1, wherein a hole is formed at the boundary between the cylindrical member and the connecting member at a position corresponding to the notch, and the hole leads to the inside of the cylindrical member.

4. The member to be welded has a cylindrical outer shape, The exhaust system device according to claim 1, wherein the notch is an arc-shaped notch similar to the outer edge of the member to be welded.

5. The connecting member is connected to the cylindrical member such that it covers the side of the cylindrical member from the outside around the open end. The exhaust system device according to any one of claims 1 to 4, wherein the notch is provided in the connecting member at least.

6. The exhaust system device according to any one of claims 1 to 4, wherein the cylindrical member and the connecting member are butt-welded to each other around the notch.

Images