JP2003041627A - Exhaust-gas reducer of built-in counterweight for construction machinery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the exhaust gas and noises of an engine by disposing an exhaust-gas reducer for the engine loaded on construction machinery such as a hydraulic backhoe, a self-loader, a bulldozer, a wheel loader, a belt type loader or the like and the construction machinery such as agricultural machinery in a counterweight for the construction machinery regarding the exhaust-gas reducer of the built-in counterweight for the construction machinery. SOLUTION: The engine 22 loaded on the construction machinery, the counterweight 10 disposed to the construction machinery, a recessed section 11 formed to the counterweight 10 and the exhaust-gas reducer 40 for the engine 22 arranged in the recessed section 11 are provided. The exhaust-gas reducer is constituted in such a manner that the reducer 40 and the engine 22 are connected by a piping having a flexible means or an exhaust gas from the engine 22 is decreased and discharged outside the counterweight 10 through a discontinuous guide pipe to the exhaust port of the reducer 40 while lowering exhaust noises.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a built-in counterweight for construction machines such as hydraulic excavators, self-loaders, bulldozers, wheel loaders, crawler loaders, etc., construction machines such as agricultural machines (hereinafter simply referred to as construction machines). Exhaust gas reducing device.

[0002]

2. Description of the Related Art A construction machine such as a hydraulic excavator has a counterweight 02 connected to an engine room 01 as shown in FIGS. or,
In the above engine room 01, an engine 03, a hydraulic pump 04, an exhaust gas reduction device 05, etc. are arranged,
The exhaust port 06a of the exhaust pipe 06 of the muffler 05 is arranged so as to project to the outside from a hole 08 formed in the engine hood 07.

[0003]

However, the oxidation catalyst device 05 also serving as a muffler arranged in the engine room 01 is accommodated inside the engine hood 07, but the engine hood 07 is made of a thin material. For example, since it is made of iron plate or resin, it has poor sound insulation, and since the engine hood 07 can be opened and closed, the engine 03
A hole 08 having a diameter larger than the diameter of the discharge port 06a of the exhaust pipe 06 is provided, and the discharge port 0
6a and the hole 08 do not interfere with each other.

On the other hand, there is an exhaust gas reducing device for the diesel engine 03, which is installed in the above construction machine.
Further, when the above exhaust gas regulations become stricter, it is said that the capacity of the exhaust gas reducing device is about three times that of the present exhaust gas reducing device. In addition, the exhaust gas reduction device currently adopted employs an oxidation catalyst as described above for the purpose of removing carbon monoxide and the like in vehicles for tunnel construction, etc. Is arranged in a region close to the.

Further, the exhaust gas reducing device and the exhaust silencer are arranged in series, and the exhaust gas reducing device is a reduction catalyst device for reducing nitrogen oxide NOX and hydrocarbons HC,
The oxidation catalyst device for reducing carbon monoxide CO and the device for reducing particulate matter such as particulates are configured so as to be divided or partially used. As shown in FIG. 10 and FIG. 11, the above-mentioned device adopted in the above is an exhaust gas oxidation catalyst device which also has the function of the exhaust silencer adopted in the above. Since it is similar to a device, it is easy to install, but if the above regulations become strict, a volume three times larger than the above will be required, and the installation location will be a problem.

Therefore, there is a technical problem to be solved in order to block the noise radiated from the muffler main body provided in the engine room to prevent the muffler noise from leaking to the outside of the construction machine and to reduce the exhaust gas. Has occurred. The present invention was devised in view of the above, and an engine mounted on a construction machine, a counterweight arranged on the construction machine, a recess provided on the canter weight, and a recess provided in the recess. An exhaust gas reducing device for the engine provided is provided, and the exhaust gas reducing device and the engine are connected by a pipe having a flexible means, or via an exhaust pipe of the exhaust gas reducing device and a discontinuous induction pipe. It is an object of the present invention to provide an exhaust gas reducing device with a built-in counter weight for a construction machine, which exhausts the exhaust gas of the engine to the outside of the counter weight while reducing the exhaust gas and reducing exhaust noise.

[0007]

Therefore, an exhaust gas reducing device with a built-in counterweight for a construction machine according to the present invention is an engine mounted on the construction machine and a counter arranged on the construction machine. A weight, a recess provided in the canter weight, and an exhaust gas reducing device for the engine disposed in the recess, and connecting the exhaust gas reducing device and the engine with a pipe having a flexible means? Alternatively, the exhaust gas of the engine is exhausted to the outside of the counterweight through the exhaust port of the exhaust gas reducing device and the discontinuous guide pipe.

According to a second aspect of the present invention, there is provided an exhaust gas reducing device with a built-in counterweight for a construction machine according to the first aspect, wherein the engine exhaust muffler is also used as the exhaust gas reducing device. Alternatively, the exhaust silencer and the exhaust gas reduction device are arranged in series. An exhaust gas reducing device with a built-in counterweight for a construction machine according to a third aspect of the present invention is the second aspect.
In the configuration described above, the exhaust silencer and the exhaust gas reducing device are arranged in series and are arranged in a plurality of stages in the vertical direction in the recess of the counterweight, or the exhaust silencer and the exhaust gas reducing device. One of the devices is arranged outside the counterweight.

According to a fourth aspect of the present invention, there is provided an exhaust gas reducing device with a built-in counterweight for a construction machine according to any one of the first to third aspects, wherein the bracket protrudes from the engine side into the recess. An exhaust muffler which is attached to the bracket and is supplied with exhaust gas from the exhaust gas reducing device housed in the recess, and exhaust gas of the engine is exhausted from an exhaust port of an exhaust pipe whose one end is connected to the exhaust muffler. It is characterized in that the other end of receiving is provided on the side of the counter weight that is open to the outside of the counter weight, and the guide pipe that is configured separately from the exhaust pipe.

According to a fifth aspect of the present invention, there is provided an exhaust gas reducing device for a construction machine with a built-in counterweight, wherein the exhaust gas supported in the concave portion of the counterweight has the structure according to any one of the second to fourth aspects. A flexible device that connects the reduction device and the engine flexibly; and a hole that communicates from the inside of the recess to the outside of the counterweight,
It is characterized in that the exhaust port of the exhaust silencer to which the exhaust gas reduced by the exhaust gas reducing device is supplied is projected to the outside from the hole.

According to a sixth aspect of the present invention, there is provided an exhaust gas reducing device with a built-in counterweight for a construction machine according to any one of the first to fifth aspects, wherein the guide pipe is a discharge port end of an exhaust pipe. It is characterized in that it is arranged so as to overlap with the periphery of the part with a gap. An exhaust gas reducing device with a built-in counterweight for a construction machine according to claim 7 of the present invention is the exhaust gas reducing device according to any one of claims 1, 4, 5 and 6, wherein the guide pipe is an exhaust port of an exhaust pipe. It is characterized in that it is arranged so as to overlap with the outer periphery of the above, and is attached to the counterweight side integrally with or separately from the part on the counterweight side.

According to the eighth aspect of the present invention, there is provided an exhaust gas reducing device having a built-in counterweight for a construction machine, wherein
The configuration according to any one of the items 1 to 3, wherein the flexible means is a flexible tube or a rotary pipe joint. An exhaust gas reducing device with a built-in counterweight for a construction machine according to the present invention according to claim 9 is the structure according to any one of claims 1 to 8, wherein a partition wall forming a recess provided in the counterweight is provided. At least a part of at least one of the partition walls can be opened and closed, and at least one of the exhaust silencer and the exhaust gas reducing device can be inserted and removed.

According to a tenth aspect of the present invention, there is provided an exhaust gas reducing device with a built-in counterweight for a construction machine according to any one of the fourth to ninth aspects, in which the concave portion of the counterweight faces the engine. At least one of a partition wall openably and closably attached to the opening and attached to the counter weight side, a bracket protruding from the engine to which the exhaust silencer or the exhaust gas reducing device is attached, and the exhaust pipe can be inserted. And a hole formed in the partition wall, and the partition wall is formed of an elastic member, or is formed of an elastic seal member that is attached between the hole of the partition wall and at least the bracket that is inserted through the hole. It is characterized by being.

According to the eleventh aspect of the present invention, there is provided an exhaust gas reducing device with a built-in counterweight for a construction machine according to the first aspect.
In the structure according to any one of items 1 to 5, the exhaust silencer and the exhaust gas reducing device, which are disposed in the recess of the counterweight, extend along at least the outer periphery of the exhaust silencer, or along the inner wall of the recess. And a pipe for a cooling medium of a cooling device mounted on the construction machine is arranged.

According to a twelfth aspect of the present invention, there is provided an exhaust gas reducing device with a built-in counterweight for a construction machine according to the ninth aspect.
In the structure according to any one of items 1 to 3, a suction hole is provided in a partition wall of the recess on the side where cooling air from a cooling fan that cools a cooling device mounted on the construction machine flows, and the cooling fan supplies the cooling air. At least the inside of the concave portion is ventilated by the negative pressure generated in the portion of the suction hole by the cooling air flow.

According to a thirteenth aspect of the present invention, there is provided an exhaust gas reducing device with a built-in counterweight for a construction machine according to the twelfth aspect, wherein a closing member for opening and closing the suction port and the closing member for the suction port are provided. Energizing means for urging in the closing direction, a temperature sensor for detecting the temperature in the recess of the counterweight, and the temperature sensor detecting that the temperature in the recess has reached a temperature set by design specifications. And an opening means for actuating the closing member in the opening direction against the biasing force of the biasing means.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a first embodiment of the present invention.
A schematic explanatory view showing a side surface of a hydraulic excavator showing a case where an exhaust gas reducing device with a built-in counterweight of a construction machine of the present invention is applied to a hydraulic excavator which is a construction machine, and FIG. 2 is taken along a line 2A-2A in FIG. Schematic explanatory view showing a plan view, FIG.
2 is a schematic explanatory view showing an exhaust gas reducing device mounting configuration showing a vertical sectional view taken along the arrow 3A in FIG. 2, FIG. 4 is a schematic explanatory view showing an enlarged view of the exhaust gas reducing device mounting structure of FIG. 3, and FIG. Second
FIG. 6 shows an embodiment, and is a schematic explanatory view showing a state similar to FIG. 3, and FIG. 6 shows an application example of an installation portion of an exhaust gas reducing device and an exhaust silencer of the first and second embodiments of the present invention. 6A is a schematic explanatory view showing a case where an exhaust gas reducing device and an exhaust silencer are arranged in series inside a counterweight, and FIG. 6B is a schematic sectional view showing another application example of FIG. 6C is a schematic explanatory view showing a view 6C in FIG. 6B, FIG. 6D shows another application example, and FIG.
7 is a schematic explanatory view showing a state similar to FIG. 7, FIG. 7 is a schematic explanatory view showing a similar state to FIG. 3 showing another application example of the first embodiment of FIG. 3, and FIG. 8 is an exhaust gas reducing device mounting structure of FIG. Fig. 9 is a schematic explanatory view showing an enlarged view of Fig. 9, and Fig. 9 shows a heat insulating method of the exhaust silencer. Fig. 9A shows a state in which a radiator cooling water pipe is arranged along the outer periphery of the exhaust silencer of Fig. 4. FIG. 9 (B) is a schematic explanatory view showing a state where glass wool is attached to the inner peripheral wall of the exhaust silencer shown in FIG. 9 (A).

As shown in FIG. 1, a construction machine such as a hydraulic shovel P has an upper revolving structure 2 and a lower traveling structure 4.
And a working device 6. A cab 8 for an operator room is provided at the front end of the above-described upper swing body 2,
A counterweight 10 is provided at the rear end, and an engine room 12 is provided on the frame of the upper swing body 2 on the front side of the counterweight 10 of the hydraulic excavator P as shown in FIGS. Has been.

Further, as shown in FIG. 2, the engine room 1
A plurality of cooling devices R including a plurality of intercoolers 14, an oil cooler 16, a radiator 18 and the like provided inside 2 are provided, and a cooling fan 20 for cooling the cooling device R is provided. Further, an intercooler 14 is provided above the engine 22 housed in the engine room 12.
And a supercharger 32 connected to the engine 22.

Further, as shown in FIG. 2, the hydraulic excavator P
A counterweight 10 is provided at the rear part of the counterweight 10, and the counterweight 10 has a recess 11 as shown in FIGS.
Is provided. Also, as shown in FIGS. 2 and 3, the arm 15 has one end fastened to the engine block on the engine 22 side with a bolt 25 and the other end protruding into the recess 11.
Is provided.

A bracket 15a is attached to the other end of the arm 15 as shown in FIG. 3, and in the case of this embodiment, the arm 15 and the bracket 15a are integrally formed. A fastening member 38a in which the bracket 15a is arranged along the outer periphery of the exhaust gas reducing device 40.
Both ends of the exhaust gas reducing device 40 are fastened together by nuts 25 that are screwed into threaded portions that are inserted through the horizontal portion 15ah of the bracket 15a. Further, in the mounting structure shown in FIG. 3, the flange 38ab and the bracket 15a, which are mounted on the bottom of the exhaust gas reducing device 40 by bolts, welding, etc., are detachably fastened by the bolts 25 as shown in FIG. Good.

A partition plate 13, which is a partition wall which is fastened to the counterweight 10 by a bolt 25, is provided in the opening 11a of the recess 11 of the counterweight 10 on the engine 22 side so that the opening 11a can be opened and closed. This partition plate 13
Has a through hole through which the exhaust pipe 17a connected to the above-mentioned arm 15 and the exhaust port of the engine 22 penetrates in the recess 11, and the partition plate 1 at the periphery of this through hole is provided.
A seal member 19 is attached to the unit 3 by bolts 25.

The partition plate 13 may itself be made of an elastic member. In this case, the sealing member 19 can be omitted, but when it is mounted, the sealing performance can be further improved. Further, the exhaust pipe 17 of the exhaust gas reducing device 40 side
The c is detachably fastened by a bolt 21 and a flange 21 provided at each end of the exhaust pipes 17b and 17c.

Further, the exhaust gas reducing device 40 is provided with the flange 38ab and the bracket 15a which are detachably attached by the bolt 25 as shown in FIG.
Further, the exhaust pipe 17a is attached to the engine room 1 by the partition plate 13.
The second side and the recess 11 are separated from each other, and the flanges 21 provided at the contact ends of the separated exhaust pipe 17b and exhaust pipe 17a are fastened with bolts 25.

Further, the exhaust pipe 17 connected to the outlet of the exhaust gas reducing device 40 housed in the recess 11 of the engine 22.
A discharge port 17e of d is provided, and the above-mentioned discharge port 1 is provided at one end.
A counterweight 1 that receives the exhaust gas of the engine 22 from 7e and has the other end opened to the outside of the counterweight 10.
The induction pipe 17f provided on the 0 side and configured separately from the exhaust pipe 17d is provided.

Further, in the guide tube 17f, as shown in FIGS. 3 and 4, the partition plate 13a, which is an upper partition wall, can open and close the opening 11b of the recess 11, and the counterweight 1 is fixed by the bolt 25.
It has been concluded to 0. Further, in the case of the present embodiment, the flange 23 is provided at one end of the recess 11 of the guide tube 17f on the side of the opening 11b, and the opening 11b of the recess 11 of the guide tube 17f is provided.
End of the guide tube 17f penetrates the partition plate 13a
The flange 23 and the partition plate 13a are fastened to each other by bolts 25 so that 7t overlaps with the outer circumference of the end of the exhaust pipe 17e with a gap S1.

Further, the end of the guide pipe 17f on the side of the opening 11a of the recess 11 penetrates the partition plate 13a, and the end 17t of the guide pipe 17f is spaced from the end of the exhaust port 17e of the exhaust pipe 17d. The ejector EJ has a structure in which the ejector EJ for sucking the atmospheric fluid in the counterweight 10 or the recess 11 from the gap S1 by the pumping action generated by the pressure of the exhaust gas of the engine 22 from the exhaust pipe 17d to effectively perform the ventilation. The ejector EJ has an ejector effect to ventilate and cool the inside of the counterweight 10 or the inside of the recess 11.

This ejector EJ is provided as needed. When it is not necessary, the above gap is made as small as possible, and the ejector EJ is arranged between the partition plate 13a and the guide pipe 17F via an elastic member so that the exhaust gas is exhausted. It suffices if the vibration of the reduction device 40 is not transmitted, and noise can be reduced.
In the gap, the end portion 17t of the guide tube 17f and the discharge port 17e of the tube 17d may be arranged at a portion 12t of substantially the same level shown by the chain double-dashed line in FIG. Even if it is arranged in the above, the inside of the concave portion 11 can be ventilated from the gap S2 through the gap S2 as described above.

Since the first embodiment is configured as described above, when the engine 22 operates as shown in FIGS. 3 and 4, the exhaust gas of the engine 22 passes from the exhaust port through the exhaust pipes 17a and 17b. The exhaust gas reducing device 40 in the recess 11 of the counterweight 10 reduces exhaust gas and exhaust noise. Thereafter, the exhaust gas reduced in the exhaust gas reducing device 40 and silenced is discharged into the atmosphere via the exhaust port 17e of the exhaust pipe 17d and the guide pipe 17f. At this time, the ejector due to the exhaust pressure of the exhaust pipe 17d is ejected. Due to the effective pumping action, the atmospheric fluid whose temperature has risen in the recess 11 or the counterweight 10 can be effectively ventilated.

Further, the recess 11 of the exhaust gas reducing device 40 described above.
To attach / detach to / from the inside, remove the bolt 25 and remove the counterweight 10.
The partition plate 13a provided on the upper part of the counterweight 10 is removed from the counterweight 10 together with the guide tube 17f by removing at least one of the partition plates 13 and 13a to open the recess 11. It can also be removed.

Then, the bolt 25 on one of the flanges 21 and 21 of the exhaust pipes 17a and 17b is removed to fasten the bracket 15 and the fastening member 38a.
By removing the exhaust gas reducing device 40 from the recess 11
Since it can be easily attached / detached from either the opening 11a on the front side or the opening 11b of the recess 11 described above, the work can be simplified at the time of assembling the hydraulic excavator or at the time of maintenance and inspection, and the number of steps can be reduced. it can.

The exhaust gas reducing device 40 is fixed to the arm 15 and the bracket 15a, which are detachably fixed to the engine block 22a of the engine 22 by the bolts 25, as shown in FIG. Therefore, the vibration of the engine 22 is transmitted.
However, the vibration transmitted to the exhaust gas reducing device 40 as shown in FIGS.
5, the partition plate 13 through which the exhaust pipe 17a enters the recess 11 is provided with a large penetrating portion with a margin, or the partition plate 13 is made of an elastic material, or the arm 1 described above.
5. Since the exhaust pipe 17b is arranged via the sealing material 19 made of an elastic material, there is no relative movement between the counterweight 10 and the exhaust gas reducing device 40, and interference can be prevented.

On the other hand, the overlapping portion of the exhaust pipe 17d of the exhaust gas reducing device 40 on the exhaust side of the recess 11 with the exhaust pipe 17d and the guide pipe 17f is divided with a gap S1 or S2, and is divided into the exhaust pipe 17d and the guide pipe 17f. Is configured as a separate member, and the guide pipe 17f is attached to the counterweight 10 so that relative movement between the exhaust pipe 17d and the guide pipe 17f does not occur. Device 4
0 and the counterweight 10 are prevented from interfering with each other without the occurrence of relative motion, so that the radiation noise of the exhaust gas reducing device 40 and the vibration noise of the engine 22 can be effectively reduced from leaking to the outside. is there.

Further, since the temperature of the exhaust gas reducing apparatus 40 for reducing the exhaust gas becomes high, the surface temperature also becomes extremely high, which is a device which requires attention in the past. It is improved by incorporating. Next, a second embodiment of the present invention will be described with reference to FIG. 5. The same parts as those of the first embodiment will be designated by the same reference numerals and the differences will be described.

As shown in FIG. 5, the engine 22 mounted on the hydraulic excavator P and the exhaust gas reducing device 40 arranged in the recess 11 are connected by a flexible tube 17F which is a flexible means. First, in the exhaust gas reducing device 40, the bracket 39 for the exhaust gas reducing device 40 attached to the counterweight 10 provided in the recess 11 of the counterweight 10 is fixed in the recess 11 as shown in FIG. The lower bracket 39a has an upper bracket 39b so as to sandwich the exhaust gas reducing device 40, and the flanges 39f of the both brackets are fastened by bolts 25.

An exhaust side exhaust pipe 17g, one end of which is connected to the exhaust gas reducing device 40 and the other end of which extends outside the counter weight 10, uses a counterweight with a bolt 25 to open and close the opening 11b above the recess 11. 10 is arranged so as to be inserted into the through hole 17gs of the partition plate (partition wall) 13a. In addition, the flexible tube 1 that absorbs relative motion is provided between the engine 22 and the exhaust gas reducing device 40.
Since it is connected at 7F, the exhaust gas reducing device 40 itself does not generate relative movement in the counterweight 10,
The exhaust gas reducing device 40 is sufficiently sealed with an iron plate or a gap filling material so as not to emit sound.

For example, the partition plate 13a itself is formed of an elastic material, and the vicinity of the through hole 17gs is configured to have a thin wall, for example, and the exhaust pipe 17g is provided with a flange 23,
23 may be abutted and connected by a bolt 25. Also, an exhaust pipe 17g provided on the partition plate 13a
Even if there is a case in which the through hole 17gs and the exhaust pipe 17g are disposed with a gap S3 therebetween and the two come into contact with each other, the exhaust gas reduction device 40 and the counterweight 10 described above.
Since there is no relative movement due to the presence of the flexible tube 17F between them and the flexible tube 17F, they move substantially integrally, so that the radiation noise of the exhaust gas reduction device 40 and the vibration noise of the engine 22 can be effectively reduced from the outside. It is a thing.

Further, as shown in FIG. 5, the partition plate 13a is formed.
Even if the gap S3 is sealed by providing the elastic sealing material 19 on the partition plate 13a with the above bolt 25, the same effect as the above can be obtained. On the other hand, as shown in FIG.
One end is clamped to the exhaust pipe 17c for connection extending to the side.
An exhaust pipe 17b connected to the clamp 17K and the bolt 17p is provided at one end of a flexible pipe 17F which is flexible and is connected to the other end by a bolt 17p.

Further, the other end of the flexible pipe 17F and the end of the exhaust pipe 17a connected to the exhaust port of the engine 22 are fastened with bolts 25 through the respective flanges 21. In addition, the recess 1 attached to the outer circumference of the exhaust pipe 17b is used.
A partition plate 13 attached to the counterweight 10 by a bolt 25 is provided so that the opening 11a facing the engine 22 side of No. 1 can be opened and closed.

Further, the flexible means 17F, although not shown, for example, allows a relative movement between the engine 22 and the exhaust gas reducing device 40 even if the exhaust pipes 17a and 17b are connected by a rotatable pipe joint. It can be reduced. Since the second embodiment is configured as described above, the vibration of the engine is absorbed by the flexible tube 17F as shown in FIG. 5 and is not transmitted to the exhaust gas reduction device 40, and thus Since relative movement does not occur between the exhaust gas reduction device 40 and the counterweight 10 of FIG. 1, the relative movement occurs between the exhaust pipe 17g and the partition plate 13a. Without doing so, it is possible to effectively reduce the leakage of the radiation noise of the exhaust gas reduction device 40 and the vibration noise of the engine 22 to the outside of the machine.

Further, the exhaust pipe 17g is divided into the partition plate 1 within the gap S3.
Since the elastic seal member 19 absorbs even if it comes into contact with 3a, no relative vibration occurs between the exhaust gas reducing device 40 and the counterweight 10, and the radiated sound of the exhaust silencer 38 and the vibration of the engine 22. It is possible to effectively reduce the leakage of noise to the outside of the aircraft. Then, the bolt 25 of the counterweight 10 shown in FIG. 5 is removed and the partition plate (upper partition) 13a is removed. After that, the flange 39a
Remove the bolt 25 of the upper bracket (fastening member) 39b
When the clamp 17K and the bolt 17p are removed together with removing the exhaust gas reducing device 40,
Since it can be easily attached and detached from 1b, the work at the time of assembling the hydraulic excavator and the maintenance and inspection can be simplified, and the man-hour can be reduced.

Further, as shown in FIG. 5, since there is no movable part around the exhaust gas reducing device 40, the clearance between the exhaust pipe 17g and the through hole 17gs of the partition plate 13a can be reduced, and the exhaust gas reducing device can be reduced. The noise of 40 leaks from the through hole 17gs to the outside very little. Therefore, it is possible to minimize the noise emitted from the exhaust gas reducing device 40 body from leaking to the outside of the construction machine.

In the first and second embodiments, the exhaust gas reducing device 40 is arranged in the counterweight 10, but the exhaust gas reducing device 40 is not limited to this, and the exhaust gas silencer 38 is also used. The reducing device 40 can also achieve the same effects as the above-described embodiment. Next, application examples of the first and second embodiments will be described.

In the first and second embodiments described above, the case where the exhaust gas reduction device 40 is provided alone, and the case where the exhaust gas reduction device 4 is used
Although the case where 0 is also used as the exhaust silencer 38, the exhaust silencer 38 and the exhaust gas reducing device 40 are separately formed, and the exhaust gas reducing device 40 includes the reduction catalyst device, the oxidation catalyst device, and the particulate matter. Although it may be composed of a substance reduction device or the like, in the present embodiment, the oxidation catalyst device and the particulate matter reduction device are integrally configured, and the oxidation catalyst device and the reduction catalyst device that are integrally configured are A case of being configured by two devices will be described with reference to FIG.

First, as shown in FIG. 6, substantially the same parts as those of the first and second embodiments will be designated by the same reference numerals for description. FIG. 6A shows an outline of a plan view in the vicinity of the counterweight 10, and the exhaust gas reduction device 40 described above is provided.
Is composed of an oxidation catalyst device 40b and a reduction catalyst device 40a in which the above-mentioned oxidation catalyst device and particulate matter reduction device are integrally formed, and an exhaust silencer 38 is provided in the recess 11 of the counterweight 10. It is a thing. Further, similarly to the first embodiment, one end is fastened to the engine block 22a of the engine 22 by the bolt 25 and is arranged so as to project inward of the recess 11 of the counterweight 10, and the bracket 15a is attached to the other end. An arm 15 is provided.

Then, each of the exhaust silencers 38,
The reduction catalyst device 40a and the oxidation catalyst device 40b are the first
Similar to the embodiment, it is attached to the bracket 15a arranged in the recess 11 by the fastening member 38a, the bolt 25 and the like. Further, the lower partition wall 11c of the recess 11 has
As shown in FIG. 6 (A), an outside air intake hole hi is provided as needed, and the partition plate 13 is provided with a suction hole h.
Is provided.

Further, the exhaust pipe 17d of the exhaust silencer 38 is
As shown in FIG. 7, it is configured to overlap with the guide tube 17f so that the ejector effect can be obtained. Therefore, FIG.
As shown in (A), when the engine 22 operates, NOX is reduced in the reduction catalyst device 40a of the exhaust gas reduction device 40 via the exhaust pipes 17a and 17b, and flows to the oxidation catalyst device 40b to discharge HC, CO and After the amount of particles is reduced, the sound is silenced by the exhaust silencer 38 and discharged to the outside of the machine through the exhaust pipe 17f. At this time, when it is not desired to cool the exhaust gas reducing device 40, the exhaust gas reducing device 40 and the exhaust silencer 38
A soundproof partition 13Z is provided between the exhaust silencer 38 and the exhaust silencer 38 so that opening / closing of the intake hole hi and the suction hole h is controlled by the temperature sensor TS as shown in FIGS. However, leakage of high temperature of the exhaust gas reducing device 40 may be prevented and a necessary temperature may be maintained.

Further, the closing member 13Dh for opening and closing the intake hole hi, the biasing means SP for biasing the suction port in the direction in which the closing member is closed, and the counterweight 1
The temperature sensor TS for detecting the temperature in the recessed portion 11 of 0, and the temperature sensor TS detecting that the temperature of the recessed portion 11 has reached the temperature set by the design specification, and use the biasing force of the biasing means SP. On the other hand, the opening member O for rotating the closing member 13Dh about the pivot shaft 13S to operate in the opening direction.
Since P and P are provided as shown in FIG. 7, the temperature inside the recess 11 can be controlled to a desired temperature. The opening means OP may operate the pivot shaft 13S by a motor M which operates by transmitting a detection signal of the temperature sensor TS, and a bimetal is interposed between the closing member 13Dh and the partition plate 13. Alternatively, the closing member 13Dh itself may be made of bimetal so that the opening operation is performed when the temperature reaches a temperature set according to design specifications.

At this time, the exhaust silencer 38 becomes high in temperature as described above, but the exhaust gas reducing device 40 becomes even higher in temperature due to the exhaust gas reducing action, but the exhaust pipe 17d and the exhaust pipe 17f are provided if necessary. Due to the ejector effect and the venturi effect of the suction holes h of the partition plate 13, it is possible to ventilate the high temperature ambient fluid in the recess 11 and reduce the temperature in the recess 11.

Then, if necessary, at least the outer periphery of the exhaust silencer 38 among the exhaust silencer 38, the reduction catalyst device 40a, and the oxidation catalyst device 40b, as shown in FIG. If the pipe 18c is provided at least in the exhaust silencer 38, it is possible to prevent the interior of the recess from becoming highly heated. Further, as shown in FIG. 9B, if the glass wool 38W is attached to the inner peripheral wall of the exhaust silencer 38 to prevent the leakage of high temperature to the outside, an abnormality in the recess 11 of the counterweight 10 will occur. It is desirable to prevent the generation of high temperature and to maintain the durability of parts and parts vulnerable to high temperature.

Further, it is preferable that the exhaust gas reducing device 40 be provided with the temperature sensor TS provided as necessary as described above to control the opening and closing of the closing member so that the catalyst activation temperature can be maintained. Should not be too hot. Further, as described above, the exhaust silencer 38 and the exhaust gas reducing device 40 are installed in the counterweight 1
Since it is housed in 0, space can be provided in the engine room 12, and for example, an air cleaner or the like can be arranged in the rear portion of the engine 22 or a portion above the hydraulic pump 24, which is effective utilization. There is an effect that can be done.

Further, another application example shown in FIG. 6B shows a cross section taken along line 6B-6B in FIG. 2, and is arranged in the recess 11 of the counterweight 10 in a plurality of stages vertically. In this embodiment, it is arranged in two stages, and the mounting structure for disposing the exhaust silencer 38 and the exhaust gas reducing device 40 shown in FIG. 6A is the same as that of the second embodiment. This is a case where the flexible means 17F shown in FIG. 5 is applied.

That is, the reduction catalyst device 40a, which is an exhaust gas reducing device, and the oxidation catalyst device 4 are provided in the lower first frame 40f.
0b is removably mounted by the mounting bracket 39 and the bolt 25, and the exhaust silencer 38 is removably mounted by the mounting bracket 39 and the bolt 25 on the upper second frame 38f. And the exhaust silencer 3
Exhaust pipe 17g extending from 8 to the outside of the machine, and a reduction catalyst device 4
The flexible tube 17F connecting the engine 0a and the engine 22 is shown in FIG.
The exhaust gas from the engine 22 is exhausted from the exhaust pipe 17a, the flexible pipe 17F, and the exhaust pipe 17 as shown in FIG.
a, 17b. The exhaust gas is discharged through the reduction catalyst device 40a, the oxidation catalyst device 40b, the exhaust silencer 38, and the exhaust pipe 17g through 17s to reduce and muffle the noise.

At this time, ventilation in the recess 11 has the same effects as those of the first and second embodiments and the application example shown in FIG. 9 (A), and therefore description thereof will be omitted. Furthermore,
FIG. 6 shows another application example in the same state as FIG. 6 (A).
(D) will be described. As shown in FIG. 6 (D), any one of the reduction catalyst device 40a, the oxidation catalyst device 40b, and the exhaust silencer device 38 is disposed in the recess 11 and any of the others is countered. This is the case where the weight 10 is provided outside the weight 10, for example, in the engine room 12.

In the case shown in FIG. 6 (D), the reduction catalyst device 40a is disposed above the exhaust pipe 17a at the rear of the engine 22 in the engine room 12 and through the exhaust pipe 17b and the flexible pipe 17F. It is connected to the oxidation catalyst device 40b arranged in the recess 11 and further connected to the exhaust silencer 38 through the connecting exhaust pipe 17s. In the above other application examples, the case of the mounting structure of the exhaust gas reducing device and the exhaust silencer shown in the second embodiment has been described. This is the mounting of the exhaust gas reducing device and the exhaust silencer shown in the first embodiment. Even with the structure, the same operational effect can be achieved.

Further, as shown in FIGS. 2, 5, 7 and 8, the cooling air supplied to the engine room 12 flows in as shown by an arrow Y by the cooling fan 20 and cools the cooling device R. , A part of the cooling air that has cooled the engine 22 supercharger 32 and the like flows along the partition plate 13 that is a partition wall at the rear of the engine room 12 that also serves as the front wall of the counterweight 10, and at the rear of the engine 22. For example, as shown in FIG. 2, FIG. 5, FIG. 7, and FIG. 8, through a discharge port provided in the engine hood above the engine room 12, which is determined by design specifications, as shown by arrow Y1, As shown in FIG. 2, it can be discharged from the discharge hole BE provided in the lower partition wall of the engine room or the upper partition wall of the engine room as indicated by arrow Y2.

In the second embodiment, if the partition plate 13 of the recess 11 is provided with the suction holes h as shown in FIG. 5, a part of the cooling air in the cooling air is the counterweight 10 as described above. When flowing along the partition plate (partition wall) 13 as indicated by the arrow Y, a negative pressure region is generated at the portion of the suction hole h of the partition plate 13 of the recess 11, so that a so-called Venturi effect acts in the recess 11. The ambient fluid whose temperature has risen can be sucked out to promote ventilation in the recess 11.

Further, any partition wall or partition plate 13 surrounding the above-mentioned recess 11 can be opened and closed,
Even if the exhaust silencer 38 and the exhaust gas reducing device 40 can be attached and detached, the same operational effects as described above can be obtained. Further, as shown in FIG. 9 (A), the cooling water pipe 18c of the radiator 18 for cooling the engine is arranged, for example, along the outer periphery of the exhaust silencer 38, so that the temperature rise in the recess 11 or the like. Can be suppressed.

Further, the cooling water pipe 1 disposed in the recess 11
8c is not limited to the above, and may be disposed along the high temperature portion of the recess 11 or along the partition wall in the recess 11, and further, the cooling air pipe, the cooling medium of the air condenser of the air conditioner, and the oil. A pipe for cooling hydraulic oil or the like from the cooler may be provided. Further, if the lower partition wall 13b, which constitutes the partition wall of the recess 11, is provided with the intake hole hi, the cooling air in the intake hole hi flows as shown by the arrows Y and Y1, and the ventilation in the recess 11 and the counterweight 10 is performed. The efficiency can be improved.

Further, as in the above embodiment, the recess 11 of the counterweight 10 in which the exhaust silencer 38 is arranged.
By disposing the cooling pipe 18c, the glass wool 38W, and the like shown in FIG. 9B therein, it is possible to prevent an abnormal temperature rise of the counterweight 10. Also, the lower partition wall 13
If the suction hole hi is provided in b and the suction hole h is provided in the partition plate 13, the inside of the counterweight 10 can be ventilated by the same Venturi effect as described above, and an abnormal temperature rise of the counterweight 10 can be prevented.

At the time of starting the exhaust gas reducing apparatus 40, or starting or operating in a cold region, the intake hole hi and the exhaust hole h are set by the operation of the temperature sensor ST as shown in FIGS. By providing the temperature adjusting member 13Dh that opens and closes, it is possible to efficiently raise the temperature inside the counterweight 10 and activate the catalyst.

[0062]

As described in detail above, according to the present invention as set forth in claim 1, according to the exhaust gas reducing device having the built-in counterweight of the construction machine, the exhaust gas reducing apparatus mounted on the construction machine and the engine mounted on the construction machine are provided. Unta weight, a recess provided in the counter weight, and an exhaust gas reducing device for the engine disposed in the recess, the exhaust gas reducing device and the engine by a pipe having a flexible means. Since it is configured to discharge the exhaust gas of the engine to the outside of the counter weight through the exhaust port of the exhaust gas reduction device and the discontinuous induction pipe, it is connected.
The exhaust gas reduction device and the engine are connected by the flexible means to absorb vibration of the engine and prevent transmission to the exhaust gas reduction device, or the induction pipe is provided with the exhaust gas reduction device and a counter. By preventing relative movement between the weight and the interference between the two, it is possible to minimize noise leaking to the outside of the construction machine.

Furthermore, the noise emitted from the exhaust gas reducing device body can be blocked by the counterweight. According to the exhaust gas reducing device with a built-in counterweight of the construction machine of the present invention described in claim 2, in the configuration of claim 1, the exhaust silencer of the engine is also configured to serve as the exhaust gas reducing device, or Since the exhaust muffler and the exhaust gas reducing device are arranged in series, in addition to the effect of claim 1, the exhaust muffler and the exhaust gas reducing device are formed in a compact size so that they can be used in a compact machine or the like. There is an effect that it can be applied to a vehicle having a small installation space.

Further, when the exhaust silencer and the exhaust gas reducer are arranged in series, silencing and noise reduction are efficiently performed and the counterweight is housed separately from each other. It is possible to prevent damage to the electronic device mounted on the upper swing body due to heat generated by the exhaust gas purifying action. According to the exhaust gas reducing device with a built-in counterweight of the construction machine of the present invention according to claim 3, in the configuration according to claim 2, the exhaust silencer and the exhaust gas reducing device are arranged in series, and the counterweight. The effect according to claim 2, wherein a plurality of stages are arranged in the vertical direction in the concave portion, or one of the exhaust silencer and the exhaust gas reducing device is provided outside the counterweight. In addition, it is possible to increase the storage volume inside the counterweight by arranging the counterweight in a plurality of stages in the vertical direction in the concave portion of the counterweight, and the exhaust gas reducing device includes an oxidation catalyst device, a reduction catalyst device, and a particulate matter. Even if the exhaust silencer is composed of a reducing device and several types of devices are provided together with the exhaust silencer, the above devices can be easily arranged.

Further, by disposing either of the exhaust silencer and the exhaust gas reducing device outside the counterweight, there is a degree of freedom in disposing the equipment mounted on the construction machine. . According to the exhaust gas reducing device with a built-in counterweight for a construction machine of the present invention according to claim 4, in the configuration according to any one of claims 1 to 3, a bracket protruding from the engine side into the recess, and An exhaust muffler attached to a bracket and supplied with exhaust gas from the exhaust gas reducing device housed in the recess, and an exhaust muffler that receives exhaust gas of the engine from an exhaust port of an exhaust pipe connected to the exhaust muffler at one end Is provided on the side of the counterweight that is open to the outside of the counterweight, and is provided with the guide pipe that is configured separately from the exhaust pipe, in addition to the effect of any one of claims 1 to 3, The atmosphere fluid whose temperature in the recess has risen due to the ejector effect is ventilated from the gap between the guide pipe and the outer periphery of the exhaust pipe so as to overlap with each other. It is possible.

Further, since the guide pipe is constructed so as to be attached to the counterweight side integrally with or separately from the counterweight side portion, the exhaust silencer and the exhaust silencer to which the vibration of the engine is transmitted. No relative movement occurs with the counterweight, the noise emitted from the exhaust silencer body is blocked by the counterweight, and the noise leaking to the outside of the construction machine is minimized.

According to the exhaust gas reducing device with a built-in counterweight of the construction machine of the present invention as defined in claim 5,
4. In the structure according to any one of 4 above, the flexible means for flexibly connecting the exhaust gas reducing device supported in the recess of the counterweight and the engine, and the inside of the recess to the outside of the counterweight. Since the exhaust port of the exhaust muffler, to which the exhaust gas reduced by the exhaust gas reducing device is supplied, is configured to project to the outside from the hole, the exhaust gas reducing device is provided with a hole communicating with the exhaust gas reducing device. In addition to one of the effects, the vibration of the engine is absorbed by the flexible means and is less likely to be transmitted to the exhaust silencer,
Further, the exhaust silencer is supported in the recess of the counterweight, so that relative movement does not occur between the counterweight and the exhaust silencer, or the relative vibration is reduced, and The noise emitted from the exhaust silencer body to the outside is suppressed to a minimum, and the noise emitted from the exhaust silencer body is blocked by the counterweight.

According to the exhaust gas reducing device with a built-in counterweight of the construction machine of the present invention as defined in claim 6, the exhaust gas reducing device according to claim 1
In the configuration according to any one of claims 5 to 6, the guide pipe is arranged so as to overlap with the periphery of the end portion of the exhaust port of the exhaust pipe so as to overlap with each other. In addition to the effect, the exhaust gas from the exhaust pipe can be received by the guide pipe and efficiently discharged to the outside of the counterweight, and at the same time, ventilating the atmospheric fluid in which the temperature in the recess has risen from the overlapping portion. You can

According to the exhaust gas reducing device with a built-in counterweight of the construction machine of the present invention according to claim 7,
In any one of the configurations 4, 5, and 6, the guide pipe is arranged so as to overlap with the outer periphery of the exhaust port of the exhaust pipe so as to overlap therewith, and is integral with or separate from the part on the counterweight side. Since it is configured to be attached to the body on the side of the counterweight, in addition to the effect of any one of claims 1, 4, 5 and 6, it is arranged so as to be overlapped with the outer circumference of the exhaust pipe. It is possible to ventilate the atmospheric fluid whose temperature has risen in the recess due to the ejector effect from the gap provided between the guide pipe and the guide pipe.

Further, since the guide pipe is constructed to be attached to the counterweight side integrally with or separately from the counterweight side portion, the partition wall can be easily attached to and detached from the counterweight. According to the exhaust gas reducing device with a built-in counterweight for a construction machine of the present invention as described in claim 8, in the configuration according to any one of claims 1, 2 and 5, the flexible means is a flexible pipe or a rotary pipe joint. Therefore, in addition to the effect according to any one of claims 1, 2 and 5, the vibration of the engine can be effectively absorbed by the flexible pipe or the rotary pipe joint.

According to the ninth aspect of the present invention, there is provided the exhaust gas reducing device with a built-in counterweight for the construction machine according to the first aspect.
In the configuration according to any one of 8 above, at least a part of at least one partition wall of the partition walls forming the recess provided in the counterweight can be opened / closed, and the exhaust silencer and the exhaust gas reduction apparatus can be Since at least any one of them is configured to be inserted and removed, in addition to the effect according to any one of claims 1 to 8, the partition wall of the recess is opened to the minimum so that the exhaust silencer can be attached and detached. It is possible to minimize the noise radiated from the silencer body and the noise caused by the vibration of the engine.

Further, since the exhaust silencer can be easily attached and detached from the opening at the upper part of the recess by opening and closing the partition wall of the recess, the work at the time of assembling and servicing the construction machine is simplified and the man-hours are increased. Can be reduced. Claim 10
According to the exhaust gas reducing device with a built-in counterweight of the construction machine of the present invention described in the above, in the configuration according to any one of claims 4 to 9, the counterweight is arranged so as to be openable and closable in the opening facing the engine of the concave portion of the counterweight. A partition wall provided on the counter weight side, and provided on the partition wall so that at least one of the bracket and the exhaust pipe, to which the silencer or the exhaust gas reducing device protruding from the engine is mounted, can be inserted. And the elastic seal member attached between the hole of the partition wall and the at least the bracket inserted through the hole. In addition to the effect of 4 to 9, it is possible to effectively suppress the noise generated from the inside of the recess from leaking to the outside of the machine. .

According to the exhaust gas reducing device with a built-in counterweight of the construction machine of the present invention as defined in claim 11,
In the configuration according to any one of 10 to 10, along at least the outer periphery of the exhaust silencer of the exhaust silencer and the exhaust gas reducing device arranged in the recess of the counterweight, or on the inner wall of the recess Since the pipe for the medium to be cooled of the cooling device mounted on the construction machine is arranged along the cooling device, in addition to the effect of any one of claims 1 to 10, the exhaust silencer or the recess is cooled. It is possible to reduce the temperature of the exhaust gas from the exhaust pipe protruding outside the machine and prevent thermal damage due to high temperature of the electric devices arranged in the recess.

According to the exhaust gas reducing device with a built-in counterweight of the construction machine of the present invention according to claim 12,
In the configuration according to any one of 1 to 11 above, a suction hole is provided in the partition wall of the concave portion on the side where cooling air from the cooling fan that cools the cooling device mounted on the construction machine flows, and the cooling fan supplies the cooling air. Since at least the inside of the concave portion is ventilated by the negative pressure generated in the portion of the suction hole by the cooling air flow, in addition to the effect of any one of claims 9 to 11, ventilation inside the concave portion is performed. Can be improved.

According to the exhaust gas reducing device with a built-in counterweight of the construction machine of the present invention according to claim 13,
In the configuration of 2, the closing member that opens and closes the suction port, the urging unit that urges the suction port in the direction in which the closing member closes, and the temperature sensor that detects the temperature in the concave portion of the counterweight. And opening means for detecting that the temperature inside the recess has reached a temperature set by design specifications by the temperature sensor, and actuating the closing member in the opening direction against the biasing force of the biasing means. Is equipped with
In addition to the effect of claim 12, it is possible to improve the performance of the exhaust gas reduction device or the exhaust silencer by controlling the opening and closing of the closing member by a detection signal from a temperature sensor that detects the temperature inside the canterweight. it can.

[Brief description of drawings]

FIG. 1 shows a first embodiment of the present invention, and is a schematic explanatory view showing a side surface of a hydraulic excavator showing a case in which an exhaust gas reduction device with a built-in counterweight for a construction machine of the present invention is applied to a hydraulic excavator which is a construction machine. Is.

FIG. 2 is a schematic explanatory diagram showing a plan view taken along the line 2A-2A in FIG.

FIG. 3 is a schematic explanatory view showing an exhaust gas reducing device mounting configuration showing a vertical cross-sectional view taken along the arrow 3A in FIG.

FIG. 4 is a schematic explanatory view showing an enlarged view of the exhaust gas reducing device mounting configuration of FIG.

5 shows a second embodiment of the present invention and is a schematic explanatory view showing a state similar to FIG.

FIG. 6 is a view showing an application example of an installation portion of the exhaust gas reducing device and the exhaust silencer of the first and second embodiments of the present invention,
(A) is a schematic explanatory view showing a case in which an exhaust gas reducing device and an exhaust silencer are arranged in series inside a counterweight,
6B is a schematic cross-sectional view showing another application example of FIG. 6A, FIG. 6C is a schematic explanatory view showing a view 6C of FIG. 6B,
FIG. 7D shows another application example, and is a schematic explanatory view showing a state similar to that of FIG.

FIG. 7 is a schematic explanatory diagram showing another application example of the first embodiment and showing a state similar to that of FIG.

FIG. 8 is a schematic explanatory view showing an enlarged view of the exhaust gas reduction device mounting structure of FIG. 7.

FIG. 9 is a diagram showing a heat insulating method of an exhaust silencer, which is shown in (A).
4 is a schematic explanatory view showing a state in which radiator cooling water pipes are arranged along the outer periphery of the exhaust / muffler of FIG. 4, and FIG. 9 (B) is a glass on the inner wall of the exhaust / muffler of FIG. 9 (A). It is an approximate account figure showing the state where wool was equipped.

FIG. 10 is a schematic explanatory view showing a plan view in the vicinity of an engine room of a conventional hydraulic excavator.

11 is a schematic explanatory view showing a vertical cross section in which a part of FIG. 10 is cut away.

[Explanation of symbols]

2 Upper Revolving Body 4 Lower Running Body 6 Working Device 8 Cab 10 Counterweight 11 Recess 11a, 11b Recess Opening 12 Engine Room 13 Partition Plate (Partition Wall) 13a Partition Plate (Upper Partition Wall) 13b Lower Partition Wall 14 Intercooler 15 Arm 15a Bracket 17a -17d Exhaust pipe 17f Induction pipe 17F Flexible means (flexible pipe, rotary pipe joint) 17K Clamp 17p Bolt 17t End 16 Oil cooler 18 Radiator 18c Piping (cooling water piping) 20 Cooling fan 21 Flange 22 Engine 22a Engine block 25 Bolt 38 Exhaust silencer 38a Flange 39 Bracket 39a for exhaust silencer and exhaust gas reduction device Lower bracket 39b Upper bracket 39f Flange 40 Exhaust gas reduction device 40a Reduction catalyst device 40b Oxidation catalyst device h Suction hole hi Suction Holes S1, S2, S3 gap

Claims (13)

[Claims] 1. An engine mounted on a construction machine, a counterweight arranged on the construction machine, a recess provided on the canter weight, and an exhaust gas reducing apparatus for the engine arranged in the recess. The exhaust gas of the engine is connected to the exhaust gas reducing device and the engine by a pipe having flexible means, or the exhaust gas of the engine is exhausted from the counterweight through a discontinuous induction pipe of the exhaust gas reducing device. An exhaust gas reduction device with a built-in counterweight for construction machinery, which is configured to be discharged to the outside of a vehicle. 2. The exhaust silencer of the engine is configured to also serve as the exhaust gas reducer, or the exhaust silencer and the exhaust reducer are arranged in series. Item 1. An exhaust gas reduction device with a built-in counterweight for a construction machine according to Item 1. 3. The exhaust muffler and the exhaust gas reducing device are arranged in series and are vertically arranged in a plurality of stages in the recess of the counterweight, or the exhaust muffler and the exhaust gas reducing device. The exhaust gas reducing device with a built-in counterweight of a construction machine according to claim 2, characterized in that any one of the devices is arranged outside the counterweight. 4. A bracket projecting from the engine side into the recess, an exhaust silencer to which exhaust gas is supplied from the exhaust gas reducing device attached to the bracket and housed in the recess, and an exhaust silencer at one end. An induction pipe that receives exhaust gas of the engine from an exhaust port of an exhaust pipe connected to the device, and has the other end provided on the counterweight side that opens to the outside of the counterweight and that is configured separately from the exhaust pipe; The exhaust gas reducing device with a built-in counterweight of a construction machine according to any one of claims 1 to 3, further comprising: 5. The flexible means for flexibly connecting the exhaust gas reducing device supported in the recess of the counterweight and the engine, and the hole communicating from the recess to the outside of the counterweight. The exhaust port of the exhaust silencer, to which the exhaust gas reduced by the exhaust gas reducing device is supplied, is configured to protrude from the hole to the outside, any one of claims 2 to 4. 2. An exhaust gas reducing device with a built-in counterweight for a construction machine according to item 1. 6. The guide pipe according to claim 1, wherein the guide pipe is arranged so as to overlap with the periphery of the end portion of the exhaust port of the exhaust pipe so as to overlap therewith. Exhaust gas reduction device with built-in counterweight for the construction machine described. 7. The guide pipe is disposed so as to overlap with the outer periphery of the exhaust port of the exhaust pipe so as to overlap therewith, and is attached to the counterweight side integrally with or separately from the counterweight side portion. The exhaust gas reducing device with a built-in counterweight of a construction machine according to any one of claims 1, 4, 5, and 6, wherein the exhaust gas reducing device is configured as described above. 8. The built-in counterweight for a construction machine according to claim 1, wherein the flexible means is a flexible pipe or a rotary pipe joint. Exhaust gas reduction device. 9. An exhaust muffler and an exhaust gas reducing device, wherein at least a part of at least one of partition walls forming a recess provided in the counterweight can be opened and closed. The exhaust gas reducing device with a built-in counterweight of a construction machine according to any one of claims 1 to 8, characterized in that one of them is configured to be insertable and removable. 10. A partition wall which is openably and closably disposed in an opening of the recess of the counterweight facing the engine and is attached to the counterweight side, and the exhaust silencer or the exhaust gas reducing device protruding from the engine. A hole provided in the partition wall so that at least one of the bracket and the exhaust pipe can be inserted, and the partition wall is formed of an elastic member, or the partition wall hole and the hole. An exhaust gas reduction device with a built-in counterweight for a construction machine according to any one of claims 4 to 9, characterized in that the exhaust gas reduction device is constructed of an elastic seal member that is attached between at least the bracket and the bracket. . 11. The construction machine is mounted along the outer periphery of at least the exhaust silencer of the exhaust silencer and the exhaust gas reducing device arranged in the recess of the counterweight, or along the inner wall of the recess. An exhaust gas reducing device with a built-in counterweight for a construction machine according to any one of claims 1 to 10, characterized in that a pipe for a cooling medium of the cooling device is arranged. 12. A suction hole is provided in a partition wall of the concave portion on a side where cooling air from a cooling fan for cooling a cooling device mounted on the construction machine flows, and the suction is performed by a cooling air flow supplied by the cooling fan. 12. The exhaust gas reduction of the built-in counterweight of the construction machine according to any one of claims 9 to 11, characterized in that at least the inside of the recess is ventilated by the negative pressure generated in the hole portion. apparatus. 13. A closing member that opens and closes the suction port, a biasing unit that biases the suction port in a direction in which the blocking member closes, and a temperature sensor that detects a temperature in a concave portion of the counterweight. An opening means for detecting that the temperature inside the recess has reached a temperature set according to design specifications by the temperature sensor and operating the closing member in the opening direction against the urging force of the urging means. The exhaust gas reducing device with a built-in counterweight for a construction machine according to claim 12, characterized by being provided.