JP2020002913A - Exhaust emission control device and vehicle - Google Patents

Abstract

To provide an exhaust emission control device that can improve assembling workability, and to provide a vehicle.SOLUTION: An exhaust emission control device includes: a housing having an opening part; a connection plate having one end fixed to an inner wall surface part of the housing and the other end disposed at a position exposed from the opening part; and a distributing plate having a first end fixed to the inner wall surface part and a second end fixed to the other end of the connection plate, and forming a passage for exhaust gas with the inner wall surface part. The one end of the connection plate has a waveform-shape, for example.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an exhaust purification device and a vehicle.

  For example, there is provided an exhaust gas purification device including a housing, a catalyst housed in the housing, and a catalyst for purifying exhaust gas exhausted from the internal combustion engine, wherein the purified exhaust gas flows out of the housing to a downstream exhaust pipe. Are known. In the case of such an exhaust purification device, depending on the shape of the housing, the exhaust gas may swirl inside the housing. This vortex fluctuates depending on the operation state of the internal combustion engine, and may be a factor of generating abnormal noise from the exhaust pipe.

  For example, Patent Literature 1 discloses an exhaust gas purification device provided with a rectifying plate for making the flow of exhaust gas in a housing uniform.

JP 2008-286134 A

  By the way, in the assembling work of fixing the current plate to the housing, for example, depending on the shape of the current plate and the place where the current plate is arranged, the fixing point between the housing and the current plate, for example, the current plate itself is externally provided. There is a problem that the tool may not be easily moved to the fixed portion because of the cover, and the workability of the assembly may be reduced.

  An object of the present disclosure is to provide an exhaust emission control device and a vehicle that can improve assembling workability.

In order to achieve the above object, the exhaust emission control device according to the present disclosure is provided.
A housing having an opening;
One end fixed to the inner wall surface of the housing, and a connecting plate having the other end disposed at a position exposed from the opening,
A rectifying plate having a first end fixed to the inner wall portion, and a second end fixed to the other end of the connecting plate, and forming a flow path for exhaust gas with the inner wall portion;
Is provided.

  Further, a vehicle according to the present disclosure includes the exhaust gas purification device.

  According to the present disclosure, assembly workability can be improved.

It is a schematic diagram showing an example of an exhaust gas purification device concerning one embodiment of the present invention. It is the perspective view inside the 2nd housing | casing seen from the direction inclined to the -Y side with respect to the X-axis. It is the perspective view inside the 2nd case seen from the direction inclined to + Y side to the X-axis. It is the perspective view inside the 2nd housing | casing seen from the direction inclined to + Z side with respect to the X-axis. FIG. 5 is a sectional view taken along line VV of FIG. 2.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic diagram showing an example of an exhaust gas purification device 2 according to the present invention. FIG. 1 illustrates an X axis, a Y axis, and a Z axis. In the following description, the horizontal direction in FIG. 1 is referred to as an X direction, the left direction is referred to as a “+ X direction” or “+ X side”, and the right direction is referred to as a “−X direction” or “−X side”. In addition, the vertical direction in FIG. 1 is referred to as the Y direction, the upward direction is referred to as the “+ Y direction” or “+ Y side”, and the downward direction is referred to as the “−Y direction” or “−Y side”. Further, in FIG. 1, a direction perpendicular to the paper surface is referred to as a Z direction, a near direction is referred to as a “+ Z direction” or “+ Z side”, and a depth direction is referred to as a “−Z direction” or “−Z side”. FIG. 1 shows the flow of the exhaust gas by arrows.

  FIG. 2 is a perspective view of the inside of the second housing 2b as viewed from a direction inclined toward the −Y side with respect to the X axis. As shown in FIGS. 1 and 2, the exhaust gas purification device 2 includes a first housing 2a, a second housing 2b, a catalyst 3, a filter 3a, a rectifying plate 11, and a connecting plate 12.

  The first housing 2a houses the catalyst 3 and the filter 3a. A through hole 4a is provided at the upstream end of the first housing 2a. A communication hole 4b is provided at a downstream end of the first housing 2a. The upstream exhaust pipe 1 is connected to the through hole 4a. The upstream side exhaust pipe 1 is connected to an exhaust manifold (not shown).

  The second housing 2b is arranged downstream of the first housing 2a. The second housing 2b has an opening 2d opened in the -X direction. The inside of the second housing 2b communicates with the inside of the first housing 2a via the opening 2d and the communication hole 4b.

  The catalyst 3 is composed of, for example, a three-way catalyst, an oxidation catalyst (Diesel Oxidation Catalyst: DOC), a NOx storage reduction catalyst (Lean NOx Trap: LNT), and the like, or a combination thereof. The three-way catalyst simultaneously oxidizes and reduces three components of CO, HC and NOx in the exhaust gas. The oxidation catalyst oxidizes HC and CO in the exhaust gas to purify the exhaust gas, and serves as a NOx reducing agent during the NOx regeneration for restoring the NOx storage capacity of the LNT. Has the role of oxidizing a part of the exhaust gas to raise the temperature of the exhaust gas. The LNT is formed by supporting an alkali metal or an alkaline earth metal together with a noble metal, and oxidizes NO in an oxygen-excess exhaust gas to adsorb it as a nitrate on a catalyst to purify NOx.

  The filter 3a includes, for example, a diesel particulate filter (DPF) for trapping particulate matter (PM) in exhaust gas.

  FIG. 3 is a perspective view of the inside of the second housing 2b as viewed from a direction inclined to the + Y side with respect to the X axis. FIG. 4 is a perspective view of the inside of the second housing 2b viewed from a direction inclined to the + Z side with respect to the X axis. The second housing 2b has side wall surfaces 6, 7 and a curved surface 9 as shown in FIGS. Note that the inside of the curved surface portion 9 corresponds to the “inner wall portion” of the present invention.

  The curved surface portion 9 is curved so as to bulge in the + X direction, as shown in FIGS. The curved surface portion 9 extends in the Z-axis direction. In addition, the end in the −Y direction of the curved surface 9 is particularly referred to as an upright wall 10.

  The upright wall portion 10 stands upright in the X-axis direction, as shown in FIGS. The upright wall portion 10 extends in the Z-axis direction. The upright wall portion 10 is an edge of the opening 2d on the −Y side.

  The side wall surface portion 6 is disposed on the + Z side of the curved surface portion 9 as shown in FIGS. The side wall surface portion 6 stands upright in the X-axis direction. The -X side end of the side wall surface 6 is the + Z side edge of the opening 2d. The side wall surface portion 6 is provided with a through hole 5. As shown in FIG. 4, a downstream exhaust pipe 13 is connected to the through hole 5.

  The side wall surface portion 7 is arranged on the −Z side of the curved surface portion 9 as shown in FIGS. The side wall surface portion 7 stands in the X-axis direction. The -X side end of the side wall surface 7 is the edge of the opening 2d on the -Z side.

  The current plate 11 is arranged to face the curved surface portion 9. The current plate 11 is curved so as to swell in the −X direction. The end on the + Z side of the current plate 11 is close to or in contact with the side wall surface 6. The end on the −Z side of the current plate 11 extends in the direction of the side wall surface portion 7 (the direction of the Z axis). Thus, the flow straightening plate 11 and the curved surface portion 9 form an exhaust gas passage. The exhaust gas passage has a substantially circular cross section, and is arranged so as to be accommodated in the second housing 2b. The exhaust gas flows in from the end side on the −Z side of the current plate 11 and flows out through the through hole 5 from the end side on the + Z side of the current plate 11.

  The current plate 11 and the curved surface portion 9 are fixed to each other by a known fixing method. In the present embodiment, welding is used as an example of a known fixing method.

  By the way, in order to confirm whether or not the welding strength is sufficient, it is preferable that the welding location can be visually recognized from the outside. When the welding location is covered from the outside by the current plate 11 itself or the like, a welding tool (for example, a welding torch) cannot be easily moved, making the welding operation difficult and reducing workability. There is. Further, in this case, there is a problem that the welding strength is not stable because the welding strength cannot be easily confirmed.

  Therefore, in the present embodiment, in order to improve the workability of the welding operation and facilitate the confirmation of the welding strength, the welding portion WP (see FIGS. 2 and 3) is exposed from the opening 2d. Is configured. Hereinafter, this configuration will be mainly described.

  The first end 111 located at the end in the + Y direction of the current plate 11 is welded to the curved surface 9. The first end 111 extends in the + Y direction along the curved surface 9. Thereby, the welding portion WP between the first end portion 111 and the curved surface portion 9 is exposed from the opening 2d as shown in FIGS.

  The second end 112 located at the end in the −Y direction of the current plate 11 is welded to the vertical wall portion 10 via the connecting plate 12. The details of the welding portion WP between the rectifying plate 11 and the connecting plate 12 and the welding portion WP between the connecting plate 12 and the upright wall portion 10 will be described later.

  The connecting plate 12 is an elongated body whose elongated direction is in the Z-axis direction. One end 121 of the connecting plate 12 in the short direction is welded to the upright wall portion 10. The welding portion WP between the one end portion 121 of the connecting plate 12 and the upright wall portion 10 is exposed from the opening 2d when they are welded. The reason is that after welding the one end 121 of the connecting plate 12 and the upright wall 10, the welding between the one end 121 and the upright wall 10 is performed because the current plate 11 and the connecting plate 12 are welded. This is because it is not covered with the current plate 11.

  The other end 122 in the short direction of the connecting plate 12 is welded to the second end 112 of the current plate 11. The other end 122 of the connecting plate 12 extends in the + Y direction (the inside of the opening 2d) with respect to the X axis. As a result, the welding portion WP between the other end 122 of the connecting plate 12 and the second end 112 is exposed from the opening 2d as shown in FIG.

  By the way, as a type of the welding method, for example, there is plug welding or fillet welding. In plug welding, it is necessary to make a hole in the base material before welding. Fillet welding has the advantage that preparations for drilling holes are not required. In addition, fillet welding also has an advantage that it is easier to confirm the welding strength than plug welding.

  In the present embodiment, fillet welding is used as a welding method. Further, the position and shape of the welding portion WP by the fillet welding are configured to have sufficient strength against thermal stress generated by thermal expansion and contraction of the second housing 2b and the like, for example.

  FIG. 5 is a sectional view taken along line VV of FIG. FIG. 5 shows the welded portions WP with hatching. FIG. 5 omits the current plate 11. As shown in FIG. 5, one end 121 of the connecting plate 12 to be welded to the upright wall portion 10 has a rectangular wave shape. The other end 122 of the connecting plate 12 that is welded to the second end 112 (see FIG. 2) of the current plate 11 has a rectangular wave shape.

  As shown in FIG. 5, the welding portion WP between the one end portion 121 and the upright wall portion 10 is a portion of an intermediate portion 121c between the peak portion 121a and the valley portion 121b in the rectangular wave. By setting the welding location WP to the location of the intermediate portion 121c, sufficient strength against thermal stress generated in the Z-axis direction during exhaust gas processing can be obtained.

  As shown in FIG. 5, the welding portion WP between the other end portion 122 and the second end portion 112 of the current plate 11 is a portion of the peak 122 a in the rectangular wave. By setting the welding portion WP at the peak 122a, sufficient strength against thermal stress generated in the X-axis direction can be obtained.

  Next, the assembling work of the exhaust gas purification device 2 will be described with reference to FIGS.

  First, the first end 111 of the current plate 11 is welded to the curved surface 9.

  Next, one end 121 of the connecting plate 12 is welded to the upright wall 10.

  Next, the second end 112 of the current plate 11 is welded to the other end 122 of the connecting plate 12.

  In the above-described assembling operation, the first end 111 of the rectifying plate 11 is welded to the curved surface 9, and then the one end 121 of the connecting plate 12 is welded to the upright wall 10. . That is, the first end 111 of the rectifying plate 11 may be welded to the curved surface 9 after the one end 121 of the connecting plate 12 is welded to the upright wall 10. Also in this embodiment, since the welding portion between the one end 121 of the connecting plate 12 and the upright wall portion 10 is exposed from the opening 2d, the welding operation can be easily performed.

  According to the exhaust emission control device 2 according to the above-described embodiment, the second housing 2b having the opening 2d, the one end 121 welded to the upright wall portion 10 of the second housing 2b, and the opening 2d The connecting plate 12 having the other end 122 located at the exposed position, the first end 111 welded to the curved surface portion 9, and the second end 112 welding to the other end 122 of the connecting plate 12. And a flow straightening plate 11 that forms an exhaust gas passage with the curved surface portion 9. Thereby, the welding portion between the second end portion 112 of the current plate 11 and the other end portion 122 of the connecting plate 12 is exposed from the opening 2d, and the tool can be easily moved to the welding portion. Can be improved. Further, since the welding strength can be easily confirmed, the welding strength can be stabilized.

  Further, according to the exhaust purification device 2 according to the above-described embodiment, one end 121 of the connecting plate 12 welded to the upright wall portion 10 has a corrugated shape. Thereby, the welded portion WP between the one end portion 121 of the connecting plate 12 and the upright wall portion 10 is formed into a peak 121a or a valley 121b in a wave shape, or an intermediate portion 121c between the peak 121a and the valley 121b. Since the position and shape of the welding location WP can be changed according to the direction in which the thermal stress is applied, sufficient welding strength can be obtained. For the same reason, the other end 122 of the connecting plate 12 welded to the second end 112 of the current plate 11 may have a wavy shape.

  In the above-described embodiment, the wave shape of the one end 121 of the connecting plate 12 and the like is not limited to a rectangular wave, and may be, for example, a triangular wave or a sine wave. Also in this case, for example, the peaks, valleys, and inclined portions of the triangular wave are appropriately selected to be welded portions, and the shape of the welded portions is appropriately changed, so that the thermal expansion or heat of the second housing 2b or the like is changed. It is possible to obtain sufficient strength against thermal stress caused by shrinkage.

  Further, in the above-described embodiment, the exhaust gas purifying apparatus 2 is provided with the catalyst 3 and the like. However, the present invention is not limited to this. For example, the exhaust gas purifying apparatus 2 may be a chamber provided with a device for ejecting a reducing agent to exhaust gas. There may be.

  Further, in the above-described embodiment, for example, welding is used as an example of a method of fixing the current plate 11 and the curved surface portion 9. However, the present invention is not limited to this, and the current plate 11 and the curved surface portion 9 are fixed. Any known fixing method may be used, for example, brazing may be used. Even in the case of brazing, the fixing work is exposed from the opening 2d, so that the assembling workability can be improved.

  In addition, each of the above-described embodiments is merely an example of a specific embodiment for carrying out the present invention, and the technical scope of the present invention should not be interpreted in a limited manner. That is, the present invention can be implemented in various forms without departing from the gist or the main features thereof.

  INDUSTRIAL APPLICABILITY The exhaust gas purifying apparatus of the present invention is suitably used for a vehicle required to improve assembling workability.

DESCRIPTION OF SYMBOLS 1 Upstream exhaust pipe 2 Exhaust purification device 2a 1st case 2b 2nd case 2d Opening 3 Catalyst 3a Filter 4a Through hole 4b Communication hole 5 Through hole 6,7 Side wall surface 9 Curved surface 10 Upright wall 11 Rectifying plate DESCRIPTION OF SYMBOLS 12 Connecting plate 13 Downstream exhaust pipe 111 1st end 112 2nd end 121 One end 121a Crest 121b Valley 121c Intermediate part 122 Other end 122a Crest

Claims (4)

A housing having an opening;
One end fixed to the inner wall surface of the housing, and a connecting plate having the other end disposed at a position exposed from the opening,
A rectifying plate having a first end fixed to the inner wall portion, and a second end fixed to the other end of the connecting plate, and forming a flow path for exhaust gas with the inner wall portion;
Comprising,
Exhaust gas purification device. The one end of the connecting plate has a wavy shape,
The exhaust purification device according to claim 1. The other end of the connecting plate has a wavy shape,
The exhaust purification device according to claim 1.   A vehicle comprising the exhaust gas purification device according to any one of claims 1 to 3.

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