JP2008156835A - Construction machinery provided with exhaust gas posttreatment system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To mount an exhaust gas posttreatment system on a counterweight without changing the height shape of the counterweight. <P>SOLUTION: An engine room 5 is provided a position on the other side of a cab 3 of a body 2 of a hydraulic excavator 1, and an engine is mounted. The counterweight 4 is arranged in a position farthest from the cab 3, and a recess 16 is formed. A DPF 20, which is connected to the engine via a first exhaust pipe, is arranged in the engine room 5. The DPF 20 is connected to an SCR 22, which is housed in the recess 16 of the counterweight 4, via a second exhaust pipe. A top surface of the body 2 is provided with an engine hood 6 for covering the engine room 5 and the SCR 22 in the recess 16 of the counterweight 4. When the amount of protrusion from the counterweight is changed according to the heights and sizes of the DPF and the SCR, the height of the engine hood 6 is adjusted. <P>COPYRIGHT: (C)2008,JPO&amp;INPIT

Description

  The present invention relates to a construction machine including a construction machine such as a hydraulic excavator, a self-loader, a bulldozer, a wheel loader, a crawler loader, an agricultural machine, etc. (hereinafter collectively referred to as a construction machine), and particularly after exhaust gas. The present invention relates to a construction machine provided with a processing device.

Conventionally, as a hydraulic excavator for a construction machine, for example, one disclosed in Patent Document 1 has been proposed. This hydraulic excavator is provided with a swivelable body including a cab and an engine as an operator room, a lower traveling body having a pair of crawler belts as traveling means, a bucket, an arm, etc. provided on the front side of the body. A working member. A counterweight is provided at the rear of the body.
The engine room containing the engine is covered with an engine hood so that it can be opened and closed. Further, the counterweight is formed in a substantially L-shaped cross section by cutting out the engine room side surface and the upper surface to form a recess, and an exhaust gas reduction device for a diesel engine, for example, is accommodated in the recess.
The exhaust gas reduction device includes a reduction catalyst device for reducing nitrogen oxide NOx, an oxidation catalyst device for reducing hydrocarbon HC and carbon monoxide CO, and a device for reducing particulate matter such as particulates. Such an exhaust gas reduction device is connected to an exhaust pipe connected to an exhaust port of the engine, or is further connected via a muffler (silencer).

In this hydraulic excavator, the entire exhaust gas reduction device is housed in the recess of the counterweight, and the notch portions on the engine weight side surface and the upper surface of the counterweight are enclosed by partition plates, respectively. It is said that the noise of the exhaust gas that leaks can be suppressed.
For example, the counterweight is formed of a metal plate containing concrete inside and having an outer surface made of sheet metal processing. Also, construction machines have different engine mounting positions in the body, sizes and mounting positions of post-processing devices, etc., depending on the model.
JP 2003-41627 A

By the way, in the construction machine described in Patent Document 1, the volume of the concave portion is scraped to form a concave portion that can completely accommodate the exhaust gas reducing device in the counterweight, but the counterweight works with a working member. It is necessary to secure the required mass to balance the body.
However, if the counterweight is extended to the rear side of the body in order to compensate for the decrease in the weight of the counterweight due to the formation of the recess, there is a drawback that the operation is disturbed during the turning operation of the body. In order to avoid this, if the height of the counterweight is increased, there is a drawback that hinders the rear view of the operator seated on the cab, and the appearance is deteriorated.
Further, when the outer surface of the counterweight is manufactured by sheet metal processing, it is difficult to change the height or the like of the counterweight due to a disadvantage that impairs commonality in the sheet metal processing and increases the cost. In addition, the construction machine differs in the engine mounting position in the body, the size of the post-processing device, the mounting position, etc. depending on the model, but the height of the counterweight etc. is changed for each model based on the size change of the post-processing device This also impairs commonality in sheet metal processing and increases costs, making it difficult to adopt.

  In view of such circumstances, the present invention provides a construction machine provided with an exhaust gas aftertreatment device that allows an appropriately configured exhaust gas aftertreatment device to be mounted on the counterweight without changing the height of the counterweight. For the purpose.

A construction machine provided with an exhaust gas aftertreatment device according to the present invention is a construction machine in which a counterweight is provided in a construction machine body on which an engine is mounted, a recess is formed in the counterweight, and an exhaust gas aftertreatment device is provided in the recess. An engine hood is provided to cover the engine and the exhaust gas aftertreatment device accommodated in the recess.
According to the present invention, when the exhaust gas aftertreatment device is accommodated in the recess of the counterweight, the exhaust gas aftertreatment device is covered with the engine by the engine hood regardless of the height of the exhaust gas aftertreatment device relative to the recess. Even if the height and size of the post-processing equipment are different, there is no need to adjust the depth of the counterweight by deepening the depth or changing the height. Commonality can be secured.
In addition, the engine hood covers the engine and the exhaust gas aftertreatment device without damaging the appearance of the construction machine main body, and it is possible to suppress the exhaust gas noise from leaking outside the construction machine. It is possible to suppress adverse effects on the engine by housing the exhaust gas aftertreatment device that becomes high temperature in the recess.

Further, the exhaust gas aftertreatment device may partially protrude outward from a recess formed in the counterweight.
According to the present invention, the exhaust gas aftertreatment device can be covered with the engine by the engine hood even if a part of the exhaust gas aftertreatment device protrudes outside the recess. Therefore, since the height and size of the exhaust gas aftertreatment device are different, even if the protruding amount of the portion protruding from the counterweight changes, it can be easily adjusted by the height of the engine hood, etc., and the exhaust gas aftertreatment device is placed in the recess of the counterweight. It is not necessary to accommodate the whole, and it is not necessary to change the height of the counterweight.

In addition, the exhaust gas aftertreatment device is composed of any one of OC (oxidation catalyst device), DPF (fine particle removal device), SCR (selective reduction type NOx catalyst device), LNT (NOx occlusion catalyst device) or a combination of two or more. Preferably, two or more combinations of DPF and SCR, OC and DPF, OC and SCR, OC and DPF and SCR, OC and DPF and LNT, and the like are preferable. In the case of a combination of two or more, all the devices may be disposed in the recess, but at least one may be accommodated in the recess, and the remaining devices may be disposed in the engine room or the like.
Moreover, the recessed part has a shape along the shape of the exhaust gas aftertreatment device accommodated therein, and a fixing member for fixing the exhaust gas aftertreatment device accommodated in the recessed part may be provided.
By aligning the recess with the shape of the exhaust gas after-treatment device, there is no wasted space and volume reduction of the counterweight can be suppressed, and by fixing the exhaust gas after-treatment device in the recess with a fixing member, it is easy to remove and from the engine The influence of the transmitted vibration can be suppressed.
Further, the engine hood may be provided with an opening / closing part that can open and close the engine region, and the engine can be maintained without touching the exhaust gas aftertreatment device by opening the opening / closing part.

According to the construction machine provided with the exhaust gas aftertreatment device of the present invention, the exhaust gas aftertreatment device housed in the recess of the counterweight can be adjusted with the engine hood with an engine hood that can be easily adjusted in size and shape, regardless of the height and size of the exhaust gas aftertreatment device. Since the treatment device can be covered, it is not necessary to enlarge the recess or change the height of the counterweight according to the height or size of the exhaust gas aftertreatment device. Therefore, it is possible to suppress a reduction in mass due to the concave portion of the counterweight, and it is possible to secure the commonality of the height of the counterweight, thereby facilitating manufacture and reducing the cost. In addition, since the exhaust gas aftertreatment device is covered with the engine hood, the appearance of the construction machine is not impaired, and the engine hood can suppress the exhaust gas noise from leaking outside the construction machine.
Further, in the present invention, even when a part of the exhaust gas aftertreatment device protrudes outside the recess, the exhaust gas aftertreatment device is covered with the engine hood so that the entire exhaust gas aftertreatment device needs to be accommodated in the recess of the counterweight. There is no need to change the counterweight height.
Moreover, since the exhaust gas aftertreatment device includes any one or more of OC, DPF, SCR, and LNT, a necessary exhaust gas aftertreatment device can be selected and accommodated in the recess according to the type of construction machine.
In addition, since the recess has a shape along the exhaust gas aftertreatment device and includes a fixing member for the exhaust gas aftertreatment device, it is possible to suppress a wasteful decrease in the mass of the recess, and the fixing member can fix and remove the exhaust gas aftertreatment device. Is easy, and vibrations from the engine can be prevented from being transmitted.
Further, since the engine hood has an opening / closing part in the engine region, the engine can be maintained without touching the exhaust gas aftertreatment device by opening the opening / closing part.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
A construction machine equipped with an exhaust gas aftertreatment device according to an embodiment of the present invention will be described with reference to FIGS.
1 is a perspective view of a body portion of a hydraulic excavator according to an embodiment of the present invention, FIG. 2 is a perspective view of a rear portion of the body, FIG. 3 is a perspective view of FIG. 2 with an engine hood removed, and FIG. FIG. 5 is a side view of the body, FIG. 6 is a rear view of the body, and FIG. 7 is a perspective view of the rear part of the body with the engine hood open.
A hydraulic excavator 1 as a construction machine shown in FIG. 1 shows only a body 2 as a construction machine body, and a lower traveling body having a pair of crawler belts and a working member having a bucket, an arm, and the like are omitted. Yes. 1 and 2, a cab (driver's seat) 3 that an operator sits and operates is provided at the front portion of the body 2, that is, the corner portion on the front side in the traveling direction of the hydraulic excavator 1, and the counterweight 4 is provided at the rear end portion. Is installed. An engine room 5 is provided in a front region adjacent to the counterweight 4, and an engine hood 6 having a substantially trapezoidal cross section, for example, is provided to cover the engine room 5 and the counterweight 4.

In the rear part of the body 2 shown in FIGS. 3 to 6, an engine 8 such as a diesel engine is disposed in the engine room 5, and a cooling device 9 is disposed on the side of the engine 8. In the cooling device 9, an intercooler 11, an oil cooler 12, and a radiator 13 are sequentially arranged from a position far from the engine 8 to a position close thereto, and a cooling fan 14 is attached to a position adjacent to the radiator 13 (see FIG. 4). . Cooling air is sent from the cooling device 9 toward the engine 8 by driving the cooling fan 14 to cool the cooling devices 9 such as the intercooler 11, the oil cooler 12, and the radiator 13, and further cool the engine 8 and its accessories.
As shown in FIGS. 3 to 6, the counterweight 4 has a relatively large depth and depth of the first concave portion 16a and a relatively large depth by making a part of the upper surface 4a and the engine room side surface 4b, for example. A two-stage concave portion 16 including a small second concave portion 16b is formed. In addition, the recessed part 16 can be suitably formed in a shape according to the size and shape of the exhaust gas aftertreatment device to be accommodated without being limited to a two-stage shape. For example, it may be formed in a simple rectangular parallelepiped shape having a substantially rectangular cross section, a substantially sectoral cross section, or a substantially semicircular columnar shape.
The counterweight 4 has, for example, a structure in which a heavy concrete such as a slab material is incorporated inside and the outer surface is manufactured by integral molding by press working with a sheet metal structure. In addition, even if the volume is reduced by forming the recess 16 in the counterweight 4, the specific gravity can be increased by increasing the specific gravity of the concrete with a slab material or the like, or by manufacturing the counterweight 4 by casting. . Thereby, the mass reduction by providing the recessed part 16 can be suppressed.

A first exhaust pipe 17 is connected to the exhaust port of the engine 8 mounted in the engine room 5. A muffler (exhaust silencer) may be provided at an end portion or an intermediate portion of the first exhaust pipe 17. The first exhaust pipe 17 may be made of a rigid body made of metal or the like, or may be made of a flexible flexible pipe made of a bellows shape or an elastic material.
A DPF 20 is connected to the other end of the first exhaust pipe 17 as an exhaust gas aftertreatment device. The DPF 20 is a particulate removing device that removes PM (particulate matter) containing black smoke contained in the exhaust gas of the engine. For example, a diesel particulate removing device that catches PM with a filter and incinerates it with a heater in close contact with the filter. Is provided. As shown in FIG. 4, the DPF 20 is disposed on the opposite side of the cooling device 9 with the engine 8 sandwiched in the engine room 5. In the example shown in the figure, the DPF 20 has a substantially cylindrical shape. The upper portion of the DPF 20 protrudes upward and outward from the upper surfaces of the engine room 5 and the body 2 (see FIG. 5).

One end of the second exhaust pipe 21 is connected to the other end of the DPF 20, and the SCR 22 is connected to the other end of the second exhaust pipe 21 as an exhaust gas aftertreatment device. The second exhaust pipe 21 is formed of, for example, a bellows-like flexible pipe, and the portion on the DPF 20 side is disposed in the engine room 5, is bent substantially U at the middle portion, and the other end portion is the counterweight 4. The second recess 16b of the recess 16 is accommodated.
The SCR 22 is a selective reduction type NOx catalyst device that hydrolyzes urea and selectively reduces only nitrogen oxides NOx. The SCR 22 is accommodated in the first concave portion 16a of the concave portion 16 and is formed in a substantially cylindrical shape, for example, and a third exhaust pipe 23 for exhausting exhaust gas to the atmosphere is provided at the other end side away from the connection portion with the second exhaust pipe 21. It is connected. In addition, it is preferable that the recessed part 16 is formed with the shape along the shape of the connection part of SCR22 and the 2nd exhaust pipe 21 which are the waste gas aftertreatment apparatus to accommodate, ie, the 1st recessed part 16a and the 2nd recessed part 16b. Further, a silencer and OC (oxidation catalyst device) may be added to the DPF 20 and the SCR 22.
Further, as shown in FIG. 3, a fixing member 26 is provided in the recess 16, and the SCR 22 accommodated in the recess 16 is fixed by the fixing member 26. The fixing member 26 is made of, for example, a metal and is formed of an arc shape or a flexible band member, and one end is fixed to the side portion 4b of the counterweight 4 and the other end is fixed to the recess 16 or the like with a bolt or the like. Thereby, even if the vibration of the engine 8 is transmitted from the second exhaust pipe 21, the vibration of the SCR 22 can be prevented.

In the hydraulic excavator 1 according to the present embodiment, the concave portion 16 of the counterweight 4 is formed in a concave shape having a shallow depth and depth as compared with the construction machine described in the prior art, and the counterweight 4 has a relatively large volume and mass. ing. Therefore, the entire SCR 22 is not accommodated in the recess 16, and the upper portion thereof partially protrudes outside the recess 16. Further, the side portion of the SCR 22 may also protrude to the outside of the recess 16, that is, the engine room 5 side.
An engine hood 6 having, for example, a substantially trapezoidal shape in a longitudinal sectional view is attached to the upper surface of the body 2 so as to cover the engine room 5 and the recess 16 of the counterweight 4 from above. In particular, the conventional engine hood is configured to cover only the engine room 5. However, in this embodiment, the engine hood 6 extends not only to the engine room 5 but also to the counterweight 4 to cover the recess 16. ing.

A part of the engine hood 6 forms an opening / closing portion 25a, and can be opened / closed with respect to the remaining fixing portion 25b formed of a substantially L-shaped portion in plan view (see FIGS. 2 and 7). The part that can be opened by the opening / closing part 25 a is mainly an area of the engine 8 in the engine room 5, and the part of the fixing part 25 b that cannot be opened and closed is an area that covers the DPF 20 and the SCR 22 accommodated in the recess 16 of the counterweight 4.
The engine hood 6 is formed of, for example, a flat upper surface 25C and tapered side portions 25D at the periphery thereof, and the size and height can be easily adjusted by adjusting the sizes of the upper surface 25C and the side portions 25D. The size and height can be easily adjusted according to the amount of protrusion of the DPF 20 and the SCR 22 from the counterweight 4 and the engine room 5. The height of the engine hood 6 is preferably set to be equal to or less than the height when only the engine room 5 is covered, but may be set lower than at least the case where the DPF 20 or the SCR 22 is attached to the upper surface 4a of the counterweight 4.

The hydraulic excavator 1 according to the present embodiment has the above-described configuration, and the operation thereof will be described next. First, when the engine 8 of the hydraulic excavator 1 is operated, the exhaust gas is exhausted while being silenced from the exhaust port of the engine 8 through the first exhaust pipe 17 and flows into the DPF 20. In the DPF 20, PM (particulate matter) including black smoke in the exhaust gas is removed.
The exhaust gas passing through the DPF 20 passes through the second exhaust pipe 21 and flows into the SCR 22. In the SCR 22, nitrogen oxides NOx in the exhaust gas are selectively reduced and removed and released from the third exhaust pipe 23 to the atmosphere.
Further, when the first exhaust pipe 17 is formed of a flexible pipe, the vibration generated by the operation of the engine 8 can be suppressed from being attenuated by the first exhaust pipe 17 and transmitted to the DPF 20. When the first exhaust pipe 17 is formed of a rigid body, the vibration is transmitted to the DPF 20 and vibrates with the engine 8, but the vibration is attenuated by the second exhaust pipe 21 formed of a flexible pipe, and the counterweight 4 Transmission to the SCR 22 accommodated in the recess 16 can be suppressed.
Further, the exhaust gas generated by the operation of the engine 8 becomes high temperature, and the DPF 20 and the SCR 22 which are post-processing devices for processing the exhaust gas also receive heat conduction and become high temperature. However, the SCR 22 is a concave portion of the counterweight 4 far from the engine 8. 16 is provided. Further, the DPF 20 and the SCR 22 serve as exhaust gas sources, but are provided at the rear part of the body 2 farthest from the cab 3.

As described above, according to the hydraulic excavator 1 according to the present embodiment, the height and size of the portion protruding to the outside of the recess 16 due to the difference in the height and size of the DPE 20 and SCR 22 that are the exhaust gas aftertreatment devices depending on the model. Even if they are different, the engine hood 6 can cover the DPF 20 and the SCR 22 together with the engine 8. At that time, since the engine hood 6 is made of a metal plate or the like, the processing such as adjustment of the height and dimensions so as to cover the DPF 20 and the SCR 22 is easy, manufacturing is easy, and cost can be reduced.
Therefore, the counterweight 4 does not need to change the depth of the concave portion 16 and the height of the upper surface 4a according to the height and size of the DPF 20 and the SCR 22. Therefore, the counterweight 4 can suppress a reduction in the mass of the counterweight 4 due to the concave portion 16 and It is possible to ensure the commonality of the height when manufacturing the weight 4, and it is easy to perform press processing by integral molding. Further, since it is not necessary to increase the height of the counterweight 4, the operator's view from the cab 3 is not hindered. Further, since the engine hood 6 is extended to the concave portion 16 of the counterweight 4, the appearance of the hydraulic excavator 1 is not impaired.

In addition, the engine hood 6 can suppress leakage of exhaust gas noise such as DPF 20 and SCR 22 to the outside of the excavator 1. Further, since the DPF 20 and the SCR 22 that form a sound source by exhaust are provided at the position farthest from the cab 3 of the body 2, exhaust noise to the operator can be reduced.
Further, since the concave portion 16 is formed in a shape along the SCR 22 that is an exhaust gas aftertreatment device and the fixing member 26 of the SCR 22 is provided, the weight reduction of the counterweight 4 can be suppressed to the minimum, and the SCR 22 can be easily removed. In addition, the adverse effect of vibration of the engine 8 can be suppressed in a fixed state.
Moreover, the engine hood 6 can maintain the engine 8 without touching the SCR 22 or the DPF 20 by opening the opening / closing part 25a.

In the above-described embodiment, only the SCR 22 is disposed as the exhaust gas aftertreatment device in the recess 16 of the counterweight 4 and the DPF 20 is disposed in the engine room 5. However, both the SCR 22 and the DPF 20 are accommodated in the recess. May be.
FIG. 8 shows a modified example of the hydraulic excavator 1 according to the first embodiment, and is a plan view of a main part showing the arrangement structure of the exhaust gas aftertreatment device, and the same or similar members as those in the first embodiment described above. , Parts will be described using the same reference numerals.
In FIG. 8, the counterweight 4 is formed with a concave portion 27 that opens to the upper surface 4a and the side surface 4b, and the DPF 20 and the SCR 22 are accommodated in the concave portion 27, for example, arranged in parallel. The upper portions of the DPF 20 and the SCR 22 protrude upward from the upper surface 4 a of the counterweight 4. A flexible first exhaust pipe 28 connected to the exhaust port of the engine 8 in the engine room 5 is connected to one end of the DPF 22. A flexible substantially U-shaped second exhaust pipe 29 is connected to the other end of the DPF 20 and accommodated in the recess 27, and the other end of the second exhaust pipe 29 is connected to the SCR 22. ing. A third exhaust pipe 23 is connected to the SCR 22 and discharges exhaust gas to the atmosphere.
Such a recess 27 can be covered with the engine hood 6 together with the engine room 5.

  According to this modification, in addition to the effects of the above-described embodiment, both the DPF 20 and the SCR 22 are accommodated in the recess 27 of the counterweight 4 farthest away from the cab 3, so that exhaust gas noise for the operator can be suppressed. Further, since the DPF 20 and the SCR 22 are separated from the engine 8 in the recess 27, it is possible to suppress the adverse effects on the electrical equipment, wiring, and the like around the engine due to the high exhaust gas temperature.

In the above-described modification, the DPF 20 and the SCR 22 are accommodated in the recess 27 of the counterweight 4 in parallel, but may be accommodated in series.
Moreover, in the hydraulic excavator 1 according to the above-described embodiments and modifications, the DPF 20 and the SCR 22 are employed as the exhaust gas aftertreatment device, but an appropriate type of exhaust gas aftertreatment device mounted in the recess 16 can be selected as necessary. . For example, any one of OC (oxidation catalyst device), DPF, SCR, and LNT (NOx storage catalyst device) may be provided as the exhaust gas aftertreatment device. Two or more types of exhaust gas aftertreatment devices may be accommodated in combination, and suitable combinations include DPF and SCR, OC and DPF, OC and SCR, OC and DPF and SCR, OC and DPF and LNT, and the like. In the case of a combination of two or more, all exhaust gas aftertreatment devices may be disposed in the recess 16, but at least one may be accommodated in the recess 16, and the remaining devices are disposed in the engine room 5 or the like. May be. An oxidation catalyst function may be added to the DPF 20. You may connect a silencer to these.
Instead of these devices, an air cleaner may be provided, or an air cleaner may be provided in the recesses 16 and 27 of the counterweight 4 together with one or both of the DPF 20 and the SCR 22. A muffler (exhaust gas silencer) may also be provided in any of the first exhaust pipes 17, 28, the second exhaust pipe 21, and the third exhaust pipe 23, or may not be provided.

  In the above-described embodiments and modifications, the DPF 20 and the SCR 22 are configured to protrude from the upper surface 4a of the counterweight 4 and the upper surface of the body 2. However, the present invention is not limited to such a configuration, and the DPF 20 The SCR 22 may have a height that does not protrude from the upper surface 4 a of the counterweight 4 or the upper surface of the body 2. Even in this case, the engine room 5 and the recesses 16 and 27 of the counterweight 4 may be covered with the engine hood 6. The shape of the engine hood 6 is not limited to a trapezoidal shape in cross section, and can be formed into a suitable shape such as a flat plate according to the amount of protrusion of the DPF 20 and the SCR 22 from the upper surface 4a of the counterweight 4.

1 is an overall perspective view of a body portion of a hydraulic excavator according to an embodiment of the present invention. It is an expansion perspective view of the rear part of a body. It is a perspective view of the state which removed the engine hood of the rear part shown in FIG. FIG. 4 is a plan view of the main part of the body excluding the engine hood and the ceiling plate of the cooling device. It is an enlarged side view except the engine hood of the body shown in FIG. It is an enlarged rear view of the body shown in FIG. FIG. 3 is a perspective view showing a state where an engine hood at a rear portion of the body shown in FIG. 2 is opened. It is a top view of the state which removed the engine hood of the body rear part part by a modification.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hydraulic excavator 2 Body 3 Cab 4 Counterweight 5 Engine room 6 Engine hood 8 Engine 16, 27 Concave part 17, 28 First exhaust pipe 20 DPF (Exhaust gas aftertreatment device)
21, 29 Second exhaust pipe 22 SCR (exhaust gas aftertreatment device)
23 Third exhaust pipe 26 Fixing member

Claims (5)

A construction machine in which a counterweight is disposed on a construction machine body on which an engine is mounted, a recess is formed in the counterweight, and an exhaust gas aftertreatment device is provided in the recess,
A construction machine provided with an exhaust gas aftertreatment device, characterized in that an engine hood that covers the engine and the exhaust gas aftertreatment device accommodated in the recess is provided.   The construction machine provided with the exhaust gas aftertreatment device according to claim 1, wherein a part of the exhaust gas aftertreatment device protrudes outside from a recess formed in the counterweight.   The construction machine provided with the exhaust gas aftertreatment device according to claim 1 or 2, wherein the exhaust gas aftertreatment device includes any one of OC, DPF, SCR, and LNT, or a combination of two or more.   The recessed part has a shape along the shape of the exhaust gas aftertreatment device accommodated therein, and a fixing member for fixing the exhaust gas aftertreatment device accommodated in the recessed part is provided. Construction machine with exhaust gas aftertreatment device.   The construction machine provided with the exhaust gas aftertreatment device according to any one of claims 1 to 4, wherein the engine hood includes an opening / closing part capable of opening and closing an engine region.

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