JP2012092684A - Case structure of exhaust emission control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance mountability of an exhaust emission control device on a machine apparatus by reducing the size of the exhaust emission control device (in the axial direction of the exhaust emission control device) as a whole and also enabling an inflow port and an outflow port of exhaust gas to be adjustable in a circumferential direction around the axial center of the exhaust emission control device, while housing a diesel oxidation catalyst (DOC) and a diesel particulate filter (DPF) in a case of the exhaust emission control device.SOLUTION: The exhaust emission control device 1 includes: a first casing 11 which has a nearly cylindrical outline, holds the DOC 19 inside, includes the exhaust gas introducing port on the cylindrical circumferential part and has closed exhaust line upstream side; a second casing 13 which holds the DPF 20 inside; a third casing 14 which is disposed in the exhaust line downstream side of the second casing 13 and is abutted on or fixed to and coaxially with the second casing 13, and which is provided with an exhaust gas discharge port on the cylindrical circumferential part and has a space part inside and closed exhaust line downstream side; and a turning adjusting part 17 which is disposed in the abutted part of the first casing 11 and the second casing 13 and is circumferentially adjustable in turning around the axial center.

Description

  The present invention is applied to an exhaust emission control device disposed in an exhaust system of a diesel engine, and a case structure that houses a filter that captures diesel exhaust particulates (hereinafter referred to as “PM (Particulate Matter)”) contained in exhaust gas. About.

A diesel particulate filter (hereinafter referred to as “DPF (Diesel Particulate Filter)”) that captures PM contained in the exhaust gas discharged from the engine is arranged in the exhaust system of the diesel engine (hereinafter referred to as “engine”). It is installed.
When PM accumulates on the DPF due to engine operation, the exhaust gas flow resistance in the exhaust system increases, which affects the engine output.
Therefore, after the engine has been operating for a certain period of time, the PM accumulated on the DPF is repeatedly used for removal and regeneration.

In particular, a diesel engine is used as a power source for many mechanical devices such as construction machines, agricultural machines, and generators because of its thermal efficiency, fuel economy, and high torque.
However, since many of these machines are equipped with devices that meet their respective work purposes, there is a demand for downsizing the exhaust gas purification device from the standpoint of mountability.
In addition, the mounting posture of the purification device varies depending on the shape of the mounting device, and there are various directions of the exhaust gas inlet on the exhaust system upstream side of the exhaust purification device and the exhaust gas outlet on the downstream side of the exhaust system, The increase in the types of purification devices has caused a problem that the cost is high.

Japanese Unexamined Patent Application Publication No. 2007-98274 (Patent Document 1) is disclosed as a prior art.
In the case of the technique of Patent Document 1, as shown in FIG. 7 attached to the present application, a catalyst carrier 030 (DOC; diesel oxidation catalyst) is disposed in the large-diameter cylindrical portion 022a of the casing 022 of the exhaust purification device 020 from the exhaust system upstream side. The DPF 040 is disposed via the alumina mats 24 and 25 with a slight gap.
Both ends of the large diameter of the casing 022 are formed with a small-diameter cylindrical portion 22b having a tapered diameter, the exhaust system upstream side is connected to the exhaust manifold 012 of the engine 010, and the exhaust system downstream side small-diameter cylindrical portion 22b is an exhaust gas pipe. 028.
Accordingly, the exhaust purification device 020 is arranged in a straight line from the exhaust gas inflow side to the exhaust gas exhaust side, and the exhaust purification device 020 is large as a whole and has a problem in mountability as a power source for many mechanical devices such as construction machines, agricultural machines, and generators. Has produced.

JP 2007-98274 A

  Therefore, the present invention has been made in view of the above problems, and the size of the entire exhaust gas purification device (in the axial direction of the exhaust gas purification device) is accommodated while housing the diesel oxidation catalyst and the DPF in the case of the exhaust gas purification device. An object of the present invention is to improve the mountability to a mechanical device by making the exhaust gas inlet and the exhaust gas outlet adjustable in the circumferential direction around the axial center of the exhaust gas purification device while reducing the size.

  The present invention achieves such an object, and is provided in an exhaust system of an internal combustion engine and purifies harmful substances contained in exhaust gas. In the exhaust purification device, the exhaust purification device has a substantially cylindrical outer shape, A first cylindrical portion that holds an oxidation catalyst therein sequentially from the upstream side of the system, an exhaust gas introduction port is provided in the cylindrical outer peripheral portion, and the upstream side of the cylindrical exhaust system is closed, and the first cylinder A second cylindrical portion coaxially contacting the axial center of the cylindrical portion and holding the DPF therein, and an axial center of the second cylindrical portion at an opening on the exhaust system downstream side of the second cylindrical portion A third cylindrical shape that is coaxially abutted or fixed to the cylindrical outer periphery, and is provided with an exhaust gas discharge port for discharging exhaust gas at the cylindrical outer peripheral portion, and has a space inside and is closed on the downstream side of the cylindrical exhaust system. And a contact portion between the first tubular portion and the second tubular portion, the circumferential direction of the tubular portion around the axis And rotating adjustable, characterized in that a rotating adjustment portion for fixing after adjustment.

In this invention, since the third cylindrical portion is fixed to the outer peripheral portion of the opening on the downstream side of the exhaust system of the second cylindrical portion, the high pressure air is used when the PM deposited on the DPF is backwashed (backwashed) with high pressure air. By fixing the supply port to the exhaust gas discharge port, the particulate matter can be easily backwashed in a short time.
In addition, since the third cylindrical portion has a space, high-pressure air acts on the entire downstream surface of the DPF during backwashing, so that the DPF cleaning efficiency is improved.
Furthermore, a rotation adjusting portion that is fixed to the contact portion between the first cylindrical portion and the second cylindrical portion so as to be rotatable about the axis of the cylindrical portion so as to be rotatable in the circumferential direction of the cylindrical portion. Since it is provided, the versatility of mounting on the machine side where the exhaust emission control device is mounted increases, and the cost can be reduced.

  Preferably, in the present invention, the rotation adjusting portion protrudes outward from an exhaust system downstream end portion of the first tubular portion, has a first flange having a first mounting hole, and the second tube. A second flange projecting outward from the upstream end of the exhaust system and having a second mounting hole and abutting against the first flange; and the first flange through the first and second mounting holes And a first fastening member for fastening the second flange, and at least one of the first mounting hole and the second mounting hole is an arc-shaped elongated hole along the circumferential direction of the cylindrical portion It is good to do.

By adopting such a configuration, the adjustment in the circumferential direction of the exhaust gas inlet and the exhaust gas outlet can be finely adjusted freely in the range of the long hole.
Further, by temporarily tightening with a fastening member (bolt), the first tubular portion and the second tubular portion (including the third tubular portion) are maintained in a state of being movable in the circumferential direction, so that the exhaust gas inlet port And the adjustment operation in the circumferential direction with the exhaust gas discharge port becomes easy.

  In the present invention, preferably, the rotation adjusting member includes a third flange projecting outward from an exhaust system downstream end of the first tubular portion, and an exhaust system upstream of the second tubular portion. A fourth flange that protrudes outward from the end and contacts the third flange, and is fitted on the first cylindrical portion on the upstream side of the exhaust system of the third flange, and is outside the outer peripheral edge of the third flange. A first plate having a third mounting hole positioned in the direction and the second cylindrical portion on the exhaust system downstream side of the fourth flange, and positioned outward from the outer peripheral edge of the fourth flange The third flange and the fourth flange are sandwiched between the second plate having the fourth mounting hole, the third plate, and the fourth mounting hole by the first plate and the second plate. A second fastening member may be provided.

  In the present invention, preferably, the rotation adjusting member includes a fifth flange projecting outward from an exhaust system downstream end of the first tubular portion, and an exhaust system upstream of the third tubular portion. A sixth flange projecting outward from the end portion, and a fifth attachment that is fitted on the first cylindrical portion on the exhaust system upstream side of the fifth flange and is located outward from the outer peripheral edge of the fifth flange. A third plate having a hole, and a sixth mounting hole that is externally fitted to the second cylindrical portion on the downstream side of the exhaust system of the sixth flange and is located outward from the outer peripheral edge of the sixth flange. A fourth plate; and a third fastening member that sandwiches the fifth flange and the sixth flange through the fifth mounting hole and the sixth mounting hole by the third plate and the fourth plate. Good.

  Preferably, in the invention of the present application, the rotation adjusting member abuts on the outside of the closed bottom portion of the first cylindrical portion, and has a seventh mounting hole at a position larger than the outer diameter of the first cylindrical portion. The fifth plate, the sixth plate abutting against the closed bottom of the third cylindrical portion, and having an eighth mounting hole at a position larger than the outer diameter of the third cylindrical portion, and the seventh A fourth fastening member is provided for fastening the exhaust purification device in the axial direction by the fifth plate and the sixth plate through the mounting hole and the eighth mounting hole.

  By adopting such a configuration, the first cylindrical portion and the second plate are formed by two plates (the first plate and the second plate, or the third plate and the fourth plate, or the fifth plate or the sixth plate). Since the cylindrical portion is sandwiched, there is no restriction on the rotation of the cylindrical portion in the circumferential direction around the axis of the cylindrical portion, and the adjustment range is free.

  According to the present invention, while maintaining the purification performance of the exhaust purification device, the size of the entire exhaust purification device (in the axial direction of the exhaust purification device) is reduced, and the exhaust gas inlet and the exhaust gas outlet are connected to each other. It becomes possible to adjust in the circumferential direction around the shaft core, and it is possible to improve the mountability to the mechanical device.

These show the schematic block diagram of the exhaust gas purification apparatus concerning 1st Embodiment of this invention. (A) is a view taken in the direction of arrows XX in FIG. 1, (B) is a view taken in the direction of arrows Y-Y in FIG. 1, and (C) is the position of the mounting hole when the first flange and the second flange are overlapped. The relationship diagram is shown. These show the schematic block diagram of the exhaust gas purification device concerning 2nd Embodiment of this invention. These show the top view of the 1st plate concerning 2nd Embodiment. These show the schematic block diagram of the exhaust gas purification device concerning 3rd Embodiment of this invention. These show the schematic block diagram of the exhaust gas purification apparatus concerning 4th Embodiment of this invention. These show the schematic block diagram of the exhaust gas purification device in a prior art.

(First embodiment)
Hereinafter, the present invention will be described in detail with reference to embodiments shown in the drawings.
However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention only to specific examples unless otherwise specifically described. Only.

FIG. 1 shows a schematic configuration diagram of an exhaust emission control device 1 according to a first embodiment of the present invention. The exhaust purification device 1 includes a first casing 11 that is a first cylindrical portion, a second casing 13 that is a second cylindrical portion, and a third cylindrical portion in order from the exhaust system upstream side of an engine (not shown). A certain third casing 14 is sequentially connected.
The first casing 11 has a bottomed (112) cylindrical shape as a whole, and the bottom 112 is located on the upstream side of the exhaust system of the first casing 11, and the cylindrical outer periphery emits exhaust gas near the bottom 112 side. An exhaust gas inlet 12 for introduction into the first casing 11 is disposed.
The axis of the exhaust gas inlet 12 is disposed substantially perpendicular to the axis of the cylindrical first casing 11. Thereby, the magnitude | size of the axial direction of the 1st casing 11 can be made small.
And the 1st flange part 111 protruded in the outer periphery at the cylindrical outer peripheral part of the exhaust system downstream opening part of the 1st casing 11 is integrally formed.
A DOC 19 is mounted in the first casing 11 via an alumina mat 15.
The DOC 19 uses oxygen in the exhaust gas to oxidize unburned substances (soluble organic components: SOF) mainly composed of hydrocarbons (HC) in the exhaust gas to oxidize water (H ₂ 0) and carbon dioxide (CO ₂ ).
Furthermore, a space is provided on the exhaust gas introduction side of the DOC 19, and the exhaust gas introduced from the exhaust gas introduction port 12 is provided as a space that diffuses over the entire introduction side of the DOC 19.

A second flange portion 131 facing the first flange portion 111 is formed at the exhaust system upstream side opening portion of the second casing 13 whose appearance is cylindrical.
A DPF 20 is mounted in the second casing 13 via an alumina mat 15.
In the DPF 20, the DPF 20 that collects unburned fine substances (PM) in the exhaust gas is disposed with a slight gap from the oxidation catalyst 19.

The cylindrical third casing 14 has an exhaust system upstream side welded and fixed to the outer periphery of the exhaust system downstream opening of the second casing 13, and the exhaust system downstream side has a space portion closed by a bottom 141. In some cases, the space portion has an effect of silencing the exhaust gas that has passed through the DPF.
An exhaust gas exhaust port 18 for exhaust gas exhaust is disposed on the cylindrical outer peripheral portion near the bottom 141.
The axis of the exhaust gas outlet 18 is disposed substantially perpendicular to the axis of the cylindrical third casing 14. Thereby, the magnitude | size of the axial direction of the 3rd casing 14 can be further reduced according to the 1st casing 11.

The configuration of the rotation adjustment unit 17 will be described. The first flange portion 111 of the first casing 11 has a first attachment along the radial center diameter m of the first flange portion 111, as shown in FIG. 2A (indicated by arrows XX in FIG. 1). A hole 112 is provided.
The first mounting holes 112 are formed at equal intervals at four locations along the circumference of the center diameter m. n represents the inner diameter of the first casing 11.
Further, the second flange portion 131 of the second casing 13 is arranged along the radial center diameter m of the second flange portion 131 as shown in FIG. 2B (indicated by arrows YY in FIG. 1). 2 mounting holes 132 are provided. The second mounting holes 132 are formed at equal intervals at four locations along the circumference of the center diameter m. n represents the inner diameter of the second casing 13.
Furthermore, the first attachment hole 112 and the second attachment hole 132 are shifted in phase by about 45 degrees in the circumferential direction to increase the adjustment range.
As shown in FIG. 1, when the phase of the axis of the exhaust gas inlet 12 and the axis of the exhaust gas outlet 18 are shifted by approximately 180 degrees, as shown in FIG. When the first flange portion 131 and the second flange portion 131 are joined together, a part of the first mounting hole 112 of the first flange portion 111 and a part of the second mounting hole 132 of the second flange portion 131 are bolts of the fastening member. If the length and arrangement of the first mounting hole 112 and the second mounting hole 132 are determined so that they are overlapped to the extent that 171 can be inserted (shaded portion), a wide range of rotation adjustment can be secured.

The first mounting hole 112 of the first flange portion 111 and the second mounting hole 132 of the second flange portion 131 have a bolt 171 and a flat washer 172 that are first fastening members as shown in the rotation adjusting portion 17 of FIG. The spring washer 173 and the nut 174 are attached to fasten the flange portion.
Further, the second mounting hole 132 has a phase of about 45 degrees in the circumferential direction with respect to the first mounting hole 112 (based on a state in which the axis of the exhaust gas inlet 12 and the axis of the exhaust gas outlet 18 are shifted by 180 ° C.). (State of FIG. 1) It is shifted. This is to increase the adjustment range in the circumferential direction in response to the difference between the axis of the exhaust gas inlet 12 and the axis of the exhaust gas outlet 18 depending on the machine on which the exhaust gas purification apparatus 1 is mounted.
In the adjustment method, the first fastening member described above is temporarily fastened (temporarily fastened so that the first casing 11 and the second casing 13 can rotate in the circumferential direction along the axis of the exhaust gas purification device 1). Next, adjustment is made so that the axis of the exhaust gas inlet 12 and the axis of the exhaust gas outlet 18 respectively coincide with the exhaust pipe axis of the exhaust device on the machine side. Next, the fastening member is further tightened to fasten the first casing 11 and the second casing 13.

According to this embodiment, since the exhaust gas inlet 12 and the exhaust gas outlet 18 are disposed on the outer peripheral surface of the cylindrical tube portion, the axial direction of the exhaust gas purification device 1 is reduced, and the mountability to a general-purpose machine is improved.
Furthermore, since the exhaust gas introduction port 12 and the exhaust gas discharge port 18 can be adjusted in the circumferential direction around the axis of the exhaust gas purification device 1, the exhaust gas purification device 1 can be shared with various mounted machines. A cost reduction effect can be obtained.
Further, although PM accumulated in the DPF needs to be removed, the second casing 13 and the third casing 14 are fixed by welding, and the first casing 11 and the second casing 13 are fastened by bolts 171. The first casing 11 is separated from the exhaust gas, and high pressure air is introduced from the exhaust gas exhaust port 18 of the third casing 14 to apply air pressure to the DPF from the downstream side of the exhaust system of the DPF, thereby cleaning the PM deposited on the DPF. The so-called backwashing operation (to remove PM) can be carried out efficiently. This is because high-pressure air acts evenly on the entire rear surface of the DPF because there is a space in the third casing 14.

(Second Embodiment)
The same components as those in the first embodiment are denoted by the same reference numerals and the description thereof is omitted.
FIG. 3 is a schematic configuration diagram of the exhaust emission control device 2 according to the second embodiment. The exhaust emission control device 2 has an exhaust gas introduction port on the outer peripheral portion, and has a circumferential third flange 211 that protrudes slightly outward from the cylindrical outer peripheral surface at the exhaust system downstream side opening portion. The first casing 21 that is a cylindrical first cylindrical portion that houses the cylinder, and the fourth flange 221 that is shaped to face the third flange 211 in the exhaust system upstream side opening and that has the DPF 20 accommodated therein A second casing 22 that is a cylindrical second cylindrical portion, a third casing 14 that is a third cylindrical portion welded to the exhaust system rear end edge of the second casing 22, and a rotation adjusting portion 23. Has been.

  The rotation adjusting unit 23 is fitted on the cylindrical portion of the first casing 21, and the first plate 24 disposed on the back side (exhaust system upstream side position) of the third flange 211 and the second casing 22. A second plate 25 (in the present embodiment, the first and first plates have the same shape) disposed on the back surface side (exhaust system downstream side position) of the fourth flange 221. Thus, the first and second plates 24 and 25 are fastened by the bolt 231, the flat washer 232, the spring washer 233, and the nut 234 that constitute the second fastening member while sandwiching the third flange 211 and the fourth flange 221. Then, the first casing 21 and the second casing 22 are fixed.

As shown in FIG. 4, the first plate 24 (second plate 25) is a plate-like member that is annular and has a width in the radial direction. A plurality of third attachment holes 241 (fourth attachment holes 251) are arranged along the circumference (diameter P) in the intermediate portion in the width direction.
The center sides of the first and second plates 24 and 25 of the third and fourth mounting holes 241 and 251 are located outward from the outer peripheral edges of the third flange 211 and the fourth flange 221, and are hollow in the center. The diameter L has a diameter L that is large enough to pass under the first casing 21 from the attachment base of the exhaust gas inlet 12 (see the two-dot chain line in FIG. 3). (Diameter required for assembly)

  According to the present embodiment, the third flange 211, the fourth flange 221, the first and second plates 24, 25, and the fastening member are not restricted in circumferential phase, so that the rotation adjustment range is 360 degrees. As a result, the range of sharing the exhaust emission control device 1 with respect to various mounted machines is further increased, and the cost reduction effect is also increased.

(Third embodiment)
The same components as those in the first embodiment are denoted by the same reference numerals and the description thereof is omitted.
FIG. 5 is a schematic configuration diagram of the rotation adjustment unit 35 of the exhaust emission control device 3 according to the third embodiment. The exhaust emission control device 3 has an exhaust gas inlet 12 on the outer peripheral portion, and a guide portion G having a step for fitting the exhaust system upstream end edge of the second casing 32 into the exhaust system downstream opening portion, the guide A cylindrical first casing 31 that is a first cylindrical part that houses a DOC 19 inside, and a DPF 20 inside that includes a circumferential fifth flange 311 that projects slightly outward from the edge of the part G. From the cylindrical second casing 32 that is the second cylindrical portion, the guide portion H having a stepped portion that fits the exhaust system downstream end edge of the second casing 32, and the edge of the guide portion H A third casing 33 that is a third cylindrical portion having a circumferential sixth flange 331 that protrudes small outward and has an exhaust gas discharge port 18 on the outer peripheral portion, and a rotation adjusting portion 35 are included. ing.
As can be easily discriminated from FIG. 5, the first casing 31 and the third casing 33 have the same shape in this embodiment.

The rotation adjustment unit 35 is disposed on the third plate 34 disposed on the back side (exhaust system upstream position) of the fifth flange 311 and on the back side (exhaust system downstream position) of the sixth flange 331. The fourth plate 36 sandwiches the fifth flange 611 and the sixth flange 331, and the third and fourth bolts 351, flat washers 352, spring washers 353, and nuts 354 constituting the third fastening member. The plates 34 and 36 are fastened, and the second casing 32 is sandwiched and fixed between the first casing 31 and the third casing 33.
Since the second plate 34 is provided with a guide portion G and a guide portion H with respect to the first plate 24 of the second embodiment, the description is omitted because the shape is the same except that L and P are increased accordingly. To do.
In the present embodiment, the third plate 34 and the fourth plate 36 are plates having the same shape.

According to the present embodiment, the fifth flange 311, the sixth flange 331, the third and fourth plates 34 and 36, and the fastening member are not restricted in circumferential phase, and therefore the rotation adjustment range is 360 degrees. As a result, the range of sharing the exhaust emission control device 1 with respect to various mounted machines is further increased, and the cost reduction effect is also increased.
Further, since the first casing 31 and the third casing 33 have the same shape (see FIG. 5), the parts can be shared and the cost can be reduced.

(Fourth embodiment)
The same components as those in the first embodiment are denoted by the same reference numerals and the description thereof is omitted.
FIG. 6A is a schematic configuration diagram of the rotation adjustment unit 42 of the exhaust emission control device 4 according to the fourth embodiment. The exhaust purification device 4 includes an exhaust gas introduction port 12 on the outer peripheral portion, and includes a guide portion J having a step for fitting the exhaust system upstream end edge of the second casing 32 in the exhaust system downstream opening, A cylindrical first casing 41 that is a first cylindrical portion that houses DOC 19 therein, a cylindrical second casing 32 that is a second cylindrical portion that houses DPF 20 therein, and a second casing 32 A third casing 43, which is a second cylindrical portion having a stepped portion having a stepped portion that fits into the exhaust system downstream side edge, and has an exhaust gas discharge port 18 on the outer peripheral portion; a rotation adjusting portion 42; , Is composed of.
In addition, the 1st casing 41 and the 3rd casing 43 have the same shape in this embodiment so that it can distinguish easily from FIG. 6 (A).

The rotation adjusting unit 42 includes an exhaust system including a fifth plate 421 that is in contact with the bottom outer surface 411 of the first casing 41 and a sixth plate 427 that is in contact with the bottom outer surface 431 of the third casing 43. From the upstream side, the first casing 41, the second casing 32, and the third casing 43, which are assembled in the respective axial directions, are sandwiched, and a bolt 422, a flat washer 423, and a spring as fourth fastening members Tighten with washer 424 and nut 425.
As shown in FIG. 6B, the fifth plate 421 has a U-shaped cross section, and a bolt 422 is inserted through the longitudinal end portion thereof. A fifth attachment hole 426 is formed.
In the present embodiment, the fifth plate 421 and the sixth plate 427 are identical in shape.

According to the present embodiment, the third plates 421 and 421 are brought into contact with the bottom outer surface 411 of the first casing 41 and the bottom outer surface 431 of the third casing 43 and fastened by the fastening member. Becomes 360 degrees, and the range of sharing the exhaust emission control device 1 with respect to various mounted machines is further increased, and the cost reduction effect is also increased.
Further, since the first casing 41 and the third casing 43 have the same shape (see FIG. 6), the parts can be shared and the cost can be reduced.

  It can be applied to general-purpose machines, vehicles, etc. that are disposed in the exhaust system of a machine equipped with a diesel engine and purify exhaust gas discharged from the diesel engine.

1, 2, 3, 4 Exhaust gas purification device
11, 21, 31, 41 First casing (first tubular portion)
12, Exhaust gas inlet 13, 22, 32 Second casing (second cylindrical portion)
14, 33, 43 Third casing (third cylindrical portion)
17, 23, 35, 42 Rotation adjustment unit 18 Exhaust gas outlet 19 DOC
20 DPF
24 1st plate 25 2nd plate 111 1st flange 112 1st attachment hole 131 2nd flange 132 2nd attachment hole 211 3rd flange 221 4th flange 311 5th flange 331 6th flange

Claims (5)

In an exhaust purification device that is disposed in an exhaust system of an internal combustion engine and purifies harmful substances contained in exhaust gas,
The exhaust purification device has a substantially cylindrical outer shape, and sequentially holds an oxidation catalyst from the upstream side of the exhaust system, and an exhaust gas inlet is provided in the cylindrical outer peripheral portion, and the upstream side of the cylindrical exhaust system is The closed first cylindrical part, the second cylindrical part coaxially contacting the axial center of the first cylindrical part, and holding the diesel particulate filter therein, and the second cylindrical part An exhaust gas exhaust port for exhausting exhaust gas is provided in the cylindrical outer peripheral portion, and is disposed in a space inside the cylindrical outer peripheral portion while being abutted or fixed coaxially with the axial center of the second cylindrical portion. And a third cylindrical portion having a closed portion on the downstream side of the cylindrical exhaust system, and a contact portion between the first cylindrical portion and the second cylindrical portion, with the shaft center as a center. An exhaust emission control device comprising: a rotation adjusting portion that is rotatable and adjustable in a circumferential direction of the tube portion, and is fixed after the adjustment.   The rotation adjusting portion protrudes outward from an exhaust system downstream end of the first cylindrical portion, and has a first flange having a first mounting hole, and an exhaust system upstream end of the second cylindrical portion. A second flange having a second mounting hole in a circumferential projecting portion projecting outward from the portion, and contacting the first flange; and the first flange through the first and second mounting holes A first fastening member that fastens the second flange, and at least one of the first attachment hole and the second attachment hole is an arc-shaped elongated hole along a circumferential direction of the cylindrical portion. The exhaust emission control device according to claim 1, wherein the exhaust purification device is provided.   The rotation adjusting member protrudes outward from an exhaust system upstream end of the second cylindrical portion, a third flange protruding outward from the exhaust system downstream end of the first cylindrical portion, A fourth flange abutting on the third flange, and a third mounting hole that is fitted on the first cylindrical portion on the upstream side of the exhaust system of the third flange and is located outward from the outer peripheral edge of the third flange. And a first plate having a fourth mounting hole that is fitted on the second cylindrical portion on the downstream side of the exhaust system of the fourth flange and is located outward from the outer peripheral edge of the fourth flange. And a second fastening member that sandwiches the third flange and the fourth flange via the third mounting hole and the fourth mounting hole by the first plate and the second plate. The exhaust emission control device according to claim 1.   The rotation adjusting member protrudes outward from an exhaust system downstream end of the first cylindrical portion and outward from an exhaust system upstream end of the third cylindrical portion. A third plate having a fifth attachment hole and a fifth attachment hole that is fitted on the first cylindrical portion on the upstream side of the exhaust system of the fifth flange and is located outward from the outer peripheral edge of the fifth flange; A fourth plate externally fitted to the second tubular portion on the downstream side of the exhaust system of the sixth flange and having a sixth mounting hole located outward from the outer peripheral edge of the sixth flange; The plate and the fourth plate further comprise a third fastening member that sandwiches the fifth flange and the sixth flange via the fifth attachment hole and the sixth attachment hole. The exhaust emission control device according to 1.   The rotation adjusting member is in contact with the closed outer bottom portion of the first cylindrical portion, and has a fifth plate having a seventh mounting hole at a position larger than the outer diameter of the first cylindrical portion; A sixth plate that contacts the outside of the closed bottom of the three cylindrical portions and has an eighth mounting hole at a position larger than the outer diameter of the third cylindrical portion; the seventh mounting hole and the eighth mounting hole; The exhaust emission control device according to claim 1, further comprising a fourth fastening member for fastening the exhaust emission control device in an axial direction between the fifth plate and the sixth plate via a pipe.

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