JP3978320B2 - Construction machinery with built-in exhaust gas reduction device - 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

[0001]
BACKGROUND OF THE INVENTION
The present invention An exhaust gas reduction device is built in the counterweight. Construction machines such as hydraulic excavators, self-loaders, bulldozers, wheel loaders, crawler loaders, agricultural machines, etc. (hereinafter simply referred to as construction machines) Construction machinery About.
[0002]
[Prior art]
For example, a hydraulic excavator of the construction machine is provided with a counterweight 02 connected to the engine room 01 as shown in FIGS.
In the engine room 01, an engine 03, a hydraulic pump 04, an exhaust gas reduction device 05, and the like are disposed. An exhaust port 06a of an exhaust pipe 06 of the muffler 05 is a hole formed in the engine hood 07. It is arranged so as to protrude from 08 to the outside.
[0003]
[Problems to be solved by the invention]
However, although the muffler combined oxidation catalyst device 05 disposed in the engine room 01 is housed in the engine hood 07, the engine hood 07 is a thin material, for example, made of iron plate or resin. Since the sound insulation is poor and the engine hood 07 can be opened and closed, a hole 08 having a diameter sufficiently larger than the diameter of the discharge port 06a of the exhaust pipe 06 of the engine 03 is provided, and the above-mentioned exhaust is provided. The outlet 06a and the hole 08 are configured not to interfere with each other.
[0004]
On the other hand, for example, there is an exhaust gas reduction device for the diesel engine 03 mounted on the construction machine. However, if the exhaust gas regulations become more stringent, it is said that a capacity about three times that of the current exhaust gas reduction device is required.
In addition, the exhaust gas reduction device currently employed employs an oxidation catalyst as described above for the purpose of removing carbon monoxide or the like in a vehicle or the like suitable for tunnel construction. It is arrange | positioned in the site | part which adjoins.
[0005]
The exhaust gas reduction device and the exhaust silencer are arranged in series, and the exhaust gas reduction device is a reduction catalyst device that reduces nitrogen oxides NOx and the like, and an oxidation catalyst that reduces hydrocarbons HC and carbon monoxide CO. A device for reducing particulate matter, such as a device or a particulate, is configured to be divided or partly used.
As shown in FIG. 10 and FIG. 11, the exhaust gas oxidation catalyst device that also functions as the exhaust silencer employed in the above-mentioned device adopted above is also silenced in the current exhaust gas regulations. Since it is the same as the device, mounting is good, but if the above regulations become strict, a volume three times larger than the above is required and the installation location becomes a problem.
[0006]
Therefore, there is a technical problem to be solved in order to block the noise radiated from the muffler body provided in the engine room, prevent the muffler noise from leaking outside the construction machine, and reduce the exhaust gas. .
The present invention was devised in view of the above, , D Engine exhaust gas The low Reduce and discharge In construction machines with a built-in exhaust gas reduction device in the counterweight, Reduce exhaust noise And reduce exhaust gas temperature The purpose is to do.
[0007]
[Means for Solving the Problems]
For this reason, the construction machine having the exhaust gas reduction device according to the first aspect of the present invention incorporated in the counterweight includes a counterweight provided at the rear end of the upper swing body and an engine room provided in front of the counterweight. An engine housed in the engine room, a cooling device for the engine, a recess formed in the counterweight, an exhaust gas reduction device for the engine disposed in the recess, and a recess disposed in the recess. An exhaust muffler installed and connected to the exhaust gas reduction device; A flexible tube that connects the engine and the exhaust gas reduction device to absorb relative motion of the engine and the exhaust gas reduction device; And a pipe through which the cooling medium cooled in the cooling device flows is disposed along at least the outer periphery of the exhaust silencer among the exhaust silencer and the exhaust gas reduction device. .
[0008]
Contract Claim 2 A construction machine incorporating the exhaust gas reduction device of the present invention described above in a counterweight is the structure according to claim 1, wherein an arm member for fixing the exhaust gas reduction device to the engine and one end of the construction machine are provided. Exhaust silencer Connected to the Exhaust silencer The exhaust pipe for exhausting the exhaust gas from the exhaust pipe is provided separately from the exhaust pipe and is discontinuously provided so as to overlap with the outer periphery of the other end of the exhaust pipe, and the exhaust pipe is exhausted. And a guide pipe for ventilating the exhaust gas to the outside of the recess.
[0009]
Claim 3 A construction machine in which the exhaust gas reducing device according to the present invention is incorporated in a counterweight is defined in claim 1. Or 2 In the configuration described above, the piping through which the cooling medium cooled in the cooling device flows is arranged along the inner wall of the recess.
[0010]
Claim 4 A construction machine in which the exhaust gas reducing device of the present invention described above is built in a counterweight, 3 A partition plate provided so as to divide the engine room and the recess, and a suction hole provided in the partition plate for ventilating from the recess to the engine room side It is characterized by further comprising.
[0011]
Claim 5 A construction machine incorporating the exhaust gas reducing device according to the present invention in a counterweight, 4 In the configuration described above, a closing member that opens and closes the suction hole, a biasing means that biases the blocking member in a direction to close the suction hole, a temperature sensor that detects a temperature in the recess, and the temperature sensor An opening means for operating the closing member in a direction to open the suction hole against the urging force of the urging means when it is detected that the temperature in the recess is equal to or higher than a predetermined temperature. It is characterized by having prepared.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described with reference to the 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 where an exhaust gas reducing device with a built-in counterweight of the present invention is applied to a hydraulic excavator that is a construction machine. 2 is a schematic explanatory view showing a plan view taken along the line 2A-2A in FIG. 1, and FIG. 3 is a schematic explanatory view showing an exhaust gas reduction device mounting structure showing a longitudinal sectional view of the arrow 3A in FIG. 4 is a schematic explanatory view showing an enlarged view of the exhaust gas reducing device mounting structure of FIG. 3, FIG. 5 is a schematic explanatory view showing a state similar to FIG. 3, showing a second embodiment of the present invention, and FIG. The application example of the arrangement | positioning site | part of the exhaust gas reduction apparatus of 1st and 2nd embodiment of an invention and an exhaust silencer is shown, (A) has arrange | positioned the exhaust gas reduction apparatus and the exhaust silencer in series inside the counterweight. Schematic explanatory diagram showing the case, (B) is the other of FIG. 6 (A) Schematic sectional view showing an application example, (C) is a schematic explanatory view showing an arrow 6C in FIG. 6 (B), (D) shows another application example, the same state as FIG. 6 (A). FIG. 7 is a schematic explanatory view showing a state similar to FIG. 3 showing another application example of the first embodiment of FIG. 3, and FIG. 8 is an enlarged view of the exhaust gas reducing device mounting structure of FIG. FIG. 9 is a schematic explanatory view, FIG. 9 shows a heat insulation method of the exhaust silencer, (A) is a schematic explanatory view showing a state in which the cooling water piping of the radiator is disposed along the outer periphery of the exhaust exhaust silencer of FIG. (B) is a schematic explanatory view showing a state in which glass wool is attached to the inner peripheral wall of the exhaust silencer shown in FIG. 9 (A).
[0018]
As shown in FIG. 1, for example, a hydraulic excavator P, which is a construction machine, includes an upper swing body 2, a lower traveling body 4, and a work device 6.
A cab 8 for the operator room is provided at the front end of the upper swing body 2 and a counterweight 10 is provided at the rear end. Further, the frame of the upper swing body 2 is shown in FIGS. As shown, an engine room 12 is provided on the front side of the counterweight 10 of the excavator P.
[0019]
Further, as shown in FIG. 2, a plurality of cooling devices R including a plurality of intercoolers 14, oil coolers 16, radiators 18 and the like provided in the engine room 12 are provided, and a cooling fan 20 that cools the cooling device R is provided. Is provided.
Further, a supercharger 32 connected to the intercooler 14 and the engine 22 is provided on the upper portion of the engine 22 housed in the engine room 12.
[0020]
Further, as shown in FIG. 2, a counterweight 10 is provided at the rear portion of the hydraulic excavator P, and the counterweight 10 is provided with a recess 11 as shown in FIGS.
As shown in FIGS. 2 and 3, an arm 15 having one end fastened to the engine block on the engine 22 side by a bolt 25 and the other end protruding into the recess 11 is provided.
[0021]
A bracket 15a is attached to the other end of the arm 15 as shown in FIG. 3, and in the present embodiment, the arm 15 and the bracket 15a are integrally formed. The bracket 15a is disposed along the outer periphery of the exhaust gas reduction device 40. The exhaust gas reduction device is provided by a nut 25 that is screwed with a screw portion inserted so that both ends of the fastening member 38a pass through the horizontal portion 15ah of the bracket 15a. 40 is fastened via the outer periphery. The mounting structure shown in FIG. 3 is such that the flange 38ab and the bracket 15a attached to the bottom of the exhaust gas reduction device 40 by bolts, welding or the like are detachably fastened by the bolts 25 as shown in FIG. Also good.
[0022]
In addition, a partition plate 13 that is a partition wall fastened to the counterweight 10 by a bolt 25 is provided in the opening 11a on the engine 22 side of the recess 11 of the counterweight 10 so that the opening 11a can be opened and closed.
The partition plate 13 is provided with through-holes through which the exhaust pipe 17a connected to the arm 15 and the exhaust port of the engine 22 penetrates in the recess 11, respectively. The member 19 is attached with a bolt 25.
[0023]
The partition plate 13 may be made of an elastic member. In this case, the seal member 19 can be omitted. However, when the partition plate 13 is mounted, the sealing performance can be further improved.
Further, the exhaust pipe 17c on the exhaust gas reduction device 40 side is detachably fastened by a flange 21 and a bolt 25 provided at each end of the exhaust pipes 17b and 17c.
[0024]
Further, in the exhaust gas reducing device 40, the provided flange 38ab and the bracket 15a are detachably attached by bolts 25 as shown in FIG.
Further, the exhaust pipe 17a is divided into the engine room 12 side and the concave portion 11 by the partition plate 13, and each flange provided at a contact end portion between the divided exhaust pipe 17b and the exhaust pipe 17a. 21 is fastened by a bolt 25.
[0025]
Furthermore, the exhaust port 17e of the exhaust pipe 17d connected to the outlet of the exhaust gas reduction device 40 accommodated in the concave portion 11 of the engine 22 is provided, and the exhaust gas of the engine 22 from the exhaust port 17e is received at one end, The other end is provided with a guide pipe 17f that is provided on the counter weight 10 side that opens to the outside of the counter weight 10 and is configured separately from the exhaust pipe 17d.
[0026]
As shown in FIGS. 3 and 4, the guide pipe 17 f has a partition plate 13 a as an upper partition wall fastened to the counterweight 10 by a bolt 25 so that the opening 11 b of the recess 11 can be opened and closed.
Furthermore, in the case of the present embodiment, a flange 23 is provided at one end of the recess 11 of the guide tube 17f on the opening 11b side, and the end of the recess 11 of the guide tube 17f on the opening 11b side penetrates the partition plate 13a to guide the guide tube 17f. The flange 23 and the partition plate 13a are fastened by the bolt 25 so that the end 17t of the pipe 17f overlaps with the outer periphery of the end of the exhaust pipe 17e and the gap S1.
[0027]
Further, the end portion of the guide tube 17f on the opening 11a side of the recess 11 passes through the partition plate 13a, and the end portion 17t of the guide tube 17f overlaps with the end portion of the discharge port 17e of the exhaust pipe 17d. The structure is an ejector EJ in which the atmospheric fluid in the counterweight 10 or the recess 11 is sucked out from the gap S1 by the pump action generated by the pressure of the exhaust of the engine 22 from the exhaust pipe 17d, and ventilation is effectively performed. The counterweight 10 or the recess 11 is ventilated and cooled by the ejector effect of the ejector EJ.
[0028]
The ejector EJ is provided as necessary. When not required, the gap is made as small as possible and disposed between the partition plate 13a and the guide pipe 17F via an elastic member, and the exhaust gas reduction device 40 is provided. It is sufficient to prevent the vibrations from being 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 disposed at a portion 12t at substantially the same level indicated by a two-dot chain line in FIG. Even if it arrange | positions, the inside of the recessed part 11 can be ventilated from the clearance gap S2 through the clearance gap S2 similarly to the above.
[0029]
Since the first embodiment is configured as described above, when the engine 22 is operated as shown in FIGS. 3 and 4, the exhaust gas of the engine 22 is counterweighted from the exhaust port via the exhaust pipes 17a and 17b. Exhaust gas can be reduced and exhaust noise can be reduced by the exhaust gas reduction device 40 in the 10 recesses 11.
Thereafter, the exhaust gas reduced and silenced by the exhaust gas reduction device 40 is discharged into the atmosphere via the exhaust port 17e and the induction tube 17f of the exhaust pipe 17d. At this time, the ejector according to the exhaust pressure of the exhaust pipe 17d is used. The atmospheric fluid whose temperature has increased in the recess 11 or the counterweight 10 can be effectively ventilated by the pumping effect.
[0030]
In addition, when the exhaust gas reducing device 40 is attached to or detached from the recess 11, the bolt 25 is removed and at least one of the partition plates 13 and 13 a is removed from the counterweight 10 to open the recess 11. Thus, the partition plate 13a provided on the upper portion of the counterweight 10 can be removed from the counterweight 10 together with the guide tube 17f.
[0031]
Then, the bolts 25 of either the flanges 21 and 21 of the exhaust pipes 17a and 17b are removed, and the bolts 25 that fasten the bracket 15 and the fastening member 38a are removed. Since it can be easily attached and detached from either the opening 11a on the front side or the opening 11b of the recess 11, the work becomes simple at the time of assembly and maintenance of the hydraulic excavator, and the number of man-hours can be reduced. .
[0032]
Further, as shown in FIG. 3, the exhaust gas reduction device 40 is fixed to the engine block 22a of the engine 22 by the bolt 25 so as to be detachable and to the bracket 15a by the bolt 25 as described above. Therefore, the vibration of the engine 22 is transmitted.
However, as shown in FIGS. 3 and 4, the vibration transmitted to the exhaust gas reduction device 40 causes the arm 15 and the exhaust pipe 17 a to pass through the partition plate 13 that enters the recess 11 with a margin. Since the partition plate 13 is made of an elastic material, or the arm 15 and the exhaust pipe 17b are disposed via an elastic sealing material 19, the counterweight 10 There is no relative movement between the exhaust gas reduction device 40 and the exhaust gas reduction device 40, and interference can be prevented.
[0033]
On the other hand, the overlapping portion of the discharge port 17e of the exhaust pipe 17d and the induction pipe 17f of the exhaust gas reduction device 40 on the discharge side of the recess 11 is divided with a gap S1 or S2, and the exhaust pipe 17d and the induction pipe 17f are separate members. Since the guide pipe 17f is attached to the counterweight 10 and the relative movement between the exhaust pipe 17d and the guide pipe 17f does not occur, the exhaust gas reducing device 40 and Since there is no occurrence of relative motion with the counterweight 10 and interference is prevented, leakage of the emission sound of the exhaust gas reduction device 40 and the vibration noise of the engine 22 to the outside of the machine can be effectively reduced.
[0034]
In addition, since the exhaust gas reducing device 40 has a high temperature due to the action of reducing the exhaust gas, the surface temperature also becomes very high, and it has been necessary to pay attention in the past. Is improved.
Next, a second embodiment of the present invention will be described with reference to FIG. 5, but the same parts as those in the first embodiment will be denoted by the same reference numerals and different points will be described.
[0035]
As shown in FIG. 5, the engine 22 mounted on the hydraulic excavator P and the exhaust gas reduction device 40 disposed in the recess 11 are connected by a flexible tube 17F which is a flexible means.
First, in the exhaust gas reducing device 40, as shown in FIG. 5, the bracket 39 for the exhaust gas reducing device 40 attached to the counterweight 10 provided in the concave portion 11 of the counterweight 10 is fixed in the concave portion 11. The lower bracket 39a has an upper bracket 39b so as to sandwich the exhaust gas reduction device 40, and both the flanges 39f are fastened by bolts 25.
[0036]
An exhaust side exhaust pipe 17g having one end connected to the exhaust gas reduction device 40 and the other end extending outside the counter weight 10 is attached to the counterweight 10 by a bolt 25 so that the opening 11b above the recess 11 can be opened and closed. The partition plate (partition wall) 13a is disposed so as to be inserted into the through hole 17gs.
Since the engine 22 and the exhaust gas reduction device 40 are connected by a flexible tube 17F that absorbs relative motion, the exhaust gas reduction device 40 itself does not generate relative motion in the counterweight 10. It is sufficiently sealed with an iron plate or a gap filling material so that the sound of the exhaust gas reduction device 40 is not emitted.
[0037]
For example, the partition plate 13a itself is formed of an elastic material, and the flanges 23 and 23 are brought into contact with the exhaust pipe 17g in the vicinity of the through-hole 17gs, for example, with a small thickness, and are coupled by bolts 25. It may be arranged as follows.
Further, even if the clearance S3 between the through-hole 17gs of the exhaust pipe 17g provided in the partition plate 13a and the exhaust pipe 17g is provided and the both come into contact with each other, the exhaust gas reduction is performed. Since there is no relative movement due to the presence of the flexible tube 17F between the apparatus 40 and the counterweight 10, the radiated sound of the exhaust gas reduction apparatus 40 and the vibration noise of the engine 22 leak to the outside. Can be effectively reduced.
[0038]
Further, as shown in FIG. 5, even if the gap S3 of the partition plate 13a is sealed by providing the elastic seal material 19 on the partition plate 13a with the bolt 25, the same effect as described above can be obtained. .
On the other hand, as shown in FIG. 5, one end is connected to the connecting exhaust pipe 17c extending from the exhaust gas reducing device 40 to the engine 22 side by a clamp 17K and a bolt 17p, and the other end is a flexible means. An exhaust pipe 17b fastened by a clamp 17K and a bolt 17p is disposed at one end of a possible flexible pipe 17F.
[0039]
Further, the other end of the flexible tube 17F and the end of the exhaust pipe 17a connected to the exhaust port of the engine 22 are fastened by bolts 25 via respective flanges 21.
Further, a partition plate 13 is provided which is attached to the counterweight 10 by a bolt 25 so as to be able to open and close an opening 11a which is attached to the outer periphery of the exhaust pipe 17b and faces the engine 22 side of the recess 11.
[0040]
The flexible means 17F reduces the relative motion 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 that is rotatable, for example, although not shown. It is something that can be done.
Since the second embodiment is configured as described above, the vibration of the engine is absorbed by the flexible tube 17F and not transmitted to the exhaust gas reduction device 40 as shown in FIG. Since the relative movement does not occur between the exhaust gas reduction device 40 and the counterweight 10 and is configured to move substantially integrally, the relative movement occurs between the exhaust pipe 17g and the partition plate 13a. Without leakage, the leakage of the emission sound of the exhaust gas reduction device 40 and the vibration noise of the engine 22 to the outside can be effectively reduced.
[0041]
Further, even if the exhaust pipe 17g comes into contact with the partition plate 13a in the gap S3, it is absorbed by the elastic seal member 19, so that there is no relative vibration between the exhaust gas reducing device 40 and the counterweight 10, and the above Leakage of the sound emitted from the exhaust silencer 38 and the vibration noise of the engine 22 to the outside of the machine can be effectively reduced.
Then, the bolts 25 of the counterweight 10 shown in FIG. 5 are removed, and the partition plate (upper partition wall) 13a is removed. Thereafter, the bolt 25 of the flange 39a is removed, the upper bracket (fastening member) 39b is removed, and the above-described exhaust gas reduction device 40 can be easily attached / detached from the opening 11b above the recess 11 by removing the clamp 17K and the bolt 17p. Therefore, the work at the time of assembly and maintenance inspection of the hydraulic excavator is simplified, and the number of man-hours can be reduced.
[0042]
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 noise of the exhaust gas reducing device 40 can be reduced. However, leakage from the through hole 17gs to the outside is extremely small.
Therefore, it is possible to minimize the noise radiated from the exhaust gas reducing device 40 main body from leaking outside the construction machine.
[0043]
In the first and second embodiments described above, the exhaust gas reduction device 40 is disposed in the counterweight 10. However, the present invention is not limited to this, and the exhaust gas reduction device 40 that is also used as the exhaust silencer 38. However, the same operational effects as the above embodiment can be obtained.
Next, application examples of the first and second embodiments will be described.
[0044]
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 40 is also used as the exhaust silencer 38 have been described. The apparatus 40 may be formed separately, and the exhaust gas reduction device 40 may be configured by the reduction catalyst device, the oxidation catalyst device, the particulate matter reduction device, and the like. In the present embodiment, the oxidation catalyst device and the particles described above are used. A case where the particulate matter reducing device is configured as a single unit and is configured by two devices of the integrated oxidation catalyst device and the reduction catalyst device will be described with reference to FIG.
[0045]
First, as shown in FIG. 6, description will be given with the same reference numerals assigned to substantially the same parts as those in the first and second embodiments.
FIG. 6A shows an outline of a plan view in the vicinity of the counterweight 10. The exhaust gas reduction device 40 includes an oxidation catalyst device 40b in which the oxidation catalyst device and the particulate matter reduction device are integrally configured. A reduction catalyst device 40 a is provided, and an exhaust silencer 38 is further provided in the recess 11 of the counterweight 10. Similarly to the first embodiment, one end of the engine 22 is fastened to the engine block 22a by a bolt 25 so as to protrude inward of the recess 11 of the counterweight 10, and a bracket 15a is attached to the other end. An arm 15 is provided.
[0046]
Then, each of the exhaust silencer 38, the reduction catalyst device 40a, and the oxidation catalyst device 40b is connected to the bracket 15a disposed in the recess 11 in the same manner as in the first embodiment. It is attached by etc.
Further, as shown in FIG. 6A, the lower partition wall 11c of the recess 11 is provided with an outside air intake hole hi that is appropriately provided as necessary, and the partition plate 13 is provided with a suction hole h. Yes.
[0047]
Further, the exhaust pipe 17d of the exhaust silencer 38 is configured to overlap with the guide pipe 17f so that the ejector effect is produced as shown in FIG.
Therefore, when the engine 22 is operated as shown in FIG. 6A, NOX is reduced by 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. After the HC, CO, and particles are reduced, the sound is silenced by the exhaust silencer 38 and discharged from the exhaust pipe 17f. At this time, when it is not desired to cool the exhaust gas reduction device 40, a sound insulating partition wall 13Z is provided between the exhaust gas reduction device 40 and the exhaust silencer 38, or the intake holes hi, as shown in FIGS. The opening and closing of the suction hole h may be controlled by the temperature sensor TS, and the exhaust hole h may be attached only to the exhaust silencer 38 to prevent the exhaust gas reduction device 40 from leaking at a high temperature and to maintain a necessary temperature.
[0048]
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 blocking member closes, and the temperature in the recess 11 of the counterweight 10 are detected. And the temperature sensor TS detects that the temperature of the recess 11 has reached a temperature set according to design specifications, and the blocking member 13Dh pivots against the biasing force of the biasing means SP. Since the opening means OP that rotates around the support shaft 13S and operates in the opening direction is provided as shown in FIG. 7, the temperature in the recess 11 can be controlled to a desired temperature. Further, the opening means OP may operate the pivot shaft 13S by a motor M that 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, and the opening operation may be performed when the temperature is set according to the design specifications.
[0049]
At this time, the exhaust silencer 38 becomes high as described above, but the exhaust gas reduction device 40 becomes even higher due to the exhaust gas reduction action, but the ejector effect by the exhaust pipe 17d and the exhaust pipe 17f provided as necessary Due to the venturi effect of the suction hole h of the partition plate 13, the high-temperature atmospheric fluid in the recess 11 can be ventilated to reduce the temperature in the recess 11.
[0050]
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, the cooling water absorption pipe 18c is provided as shown in FIG. If it is provided at least in the exhaust silencer 38, it is possible to prevent the heat in the recess from increasing. Further, as shown in FIG. 9B, if glass wool 38W is attached to the inner peripheral wall of the exhaust silencer 38 to prevent high temperature leakage to the outside, an abnormality in the concave portion 11 of the counterweight 10 can be obtained. It is desirable to prevent the occurrence of high temperatures and to maintain the durability of parts and parts that are vulnerable to high temperatures.
[0051]
Moreover, it is preferable that the exhaust gas reduction device 40 controls the opening and closing of the closing member by the temperature sensor TS provided as necessary as described above so that the catalyst activation temperature can be maintained, and the temperature in the recess 11 is more than necessary. The temperature should not be too high.
In addition, since the exhaust silencer 38 and the exhaust gas reduction device 40 are accommodated in the counterweight 10 as described above, space can be generated in the engine room 12, for example, the rear part of the engine 22 or the hydraulic pump 24. There is an effect that the air cleaner or the like can be disposed in the upper part, and the effective use can be achieved.
[0052]
The other application example shown in FIG. 6B is a cross section taken along line 6B-6B in FIG. 2, and is arranged in a plurality of stages in the recessed portion 11 of the counterweight 10 in the vertical direction. In this embodiment, the two-stage arrangement is used, and the mounting structure for arranging the exhaust silencer 38 and the exhaust gas reduction apparatus 40 shown in FIG. 6A is the same as that of the second embodiment shown in FIG. This is a case where the flexible means 17F shown is applied.
[0053]
That is, the reduction catalyst device 40a and the oxidation catalyst device 40b, which are exhaust gas reduction devices, are detachably attached to the lower first frame 40f by the mounting bracket 39 and the bolt 25, and the exhaust silencer 38 is attached to the upper second frame 38f. Is detachably attached by the mounting bracket 39 and the bolt 25.
The exhaust pipe 17g extending from the exhaust silencer 38 to the outside of the machine and the flexible pipe 17F connecting the reduction catalyst device 40a and the engine 22 are arranged as shown in FIG. The exhaust gas is exhaust pipe 17a, flexible pipe 17F, exhaust pipes 17a, 17b. The exhaust gas is reduced through 17s through the reduction catalyst device 40a, the oxidation catalyst device 40b, the exhaust silencer 38, and the exhaust pipe 17g, and the sound is silenced and discharged outside the apparatus.
[0054]
At this time, the ventilation in the recess 11 has the same effects as those of the first and second embodiments and the application example shown in FIG.
Further, another application example will be described with reference to FIG. 6D which shows the same state as FIG.
As shown in FIG. 6D, any one of the reduction catalyst device 40a, the oxidation catalyst device 40b, and the exhaust silencer 38 is disposed in the recess 11 and the other one is countered. This is a case where it is arranged outside the weight 10, for example, in the engine room 12.
[0055]
In the case shown in FIG. 6D, a reduction catalyst device 40a is disposed above the rear part of the engine 22 in the engine room 12 via the exhaust pipe 17a, and inside the recess 11 via the exhaust pipe 17b and the flexible pipe 17F. Is connected to the oxidation catalyst device 40b, and is further connected to the exhaust silencer 38 via the exhaust pipe 17s for connection.
In the above other application examples, the case of the exhaust gas reduction device and exhaust silencer mounting structure shown in the second embodiment has been described. This is the attachment of the exhaust gas reduction device and exhaust silencer shown in the first embodiment. The same effect can be achieved with the structure.
[0056]
As shown in FIGS. 2, 5, 7 and 8, the cooling air supplied to the engine room 12 flows in as shown by the arrow Y by the cooling fan 20 to cool the cooling device R, and then the engine 22 Part of the cooling air that has cooled the turbocharger 32 and the like flows along the partition plate 13 that is a partition wall behind the engine room 12 that also serves as the front wall of the counterweight 10, and depends on the design specifications behind the engine 22 From the determined discharge port provided in the engine hood above the engine room 12, for example, as shown in FIG. 2, FIG. 5, FIG. 7, and FIG. As indicated by the arrow Y2, 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.
[0057]
In the second embodiment, as shown in FIG. 5, if the partition plate 13 of the recess 11 is provided with the suction hole h, the cooling air is a part of the cooling air as described above. When flowing along the (partition wall) 13 as indicated by an 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 the temperature in the recess 11 is caused by the so-called Venturi effect. The raised atmospheric fluid is sucked out and ventilation in the recess 11 can be promoted.
[0058]
Further, any partition wall or partition plate 13 surrounding the recess 11 can be opened and opened so that the exhaust silencer 38 and the exhaust gas reduction device 40 can be attached and detached. An effect can be produced.
Further, as shown in FIG. 9A, the cooling water pipe 18c of the radiator 18 for cooling the engine is disposed, for example, along the outer periphery of the exhaust silencer 38. Can be suppressed.
[0059]
Further, the cooling water pipe 18c disposed in the recess 11 is not limited to the above, and may be disposed along a location where the recess 11 becomes high temperature or along the partition wall in the recess 11. Air piping, a cooling medium for an air condenser of an air conditioner, piping for cooling hydraulic oil from an oil cooler, or the like may be provided.
Further, if an intake hole hi is provided in the partition wall of the recess 11, for example, the lower partition wall 13 b, the cooling air in the intake hole hi flows as indicated by arrows Y and Y 1, and ventilation in the recess 11 and the counterweight 10 is performed. Efficiency can be improved.
[0060]
Furthermore, if the cooling pipe 18c, glass wool 38W, etc. shown in FIG. 9B are provided in the recess 11 of the counterweight 10 in which the exhaust silencer 38 is provided as in the above embodiment, the counterweight is provided. Ten abnormal temperature rises can be prevented. Further, if the lower partition wall 13b is provided with an intake hole hi and the partition plate 13 is provided with a suction hole h, the counterweight 10 is ventilated by the venturi effect similar to the above to prevent abnormal temperature rise of the counterweight 10. it can.
[0061]
In the case of starting the exhaust gas reduction device 40 or in the case of starting or operating in a cold district, the temperature at which the intake hole hi and the suction hole h are opened and closed by the operation of the temperature sensor ST as shown in FIGS. If the adjusting member 13Dh is provided, the abnormal temperature rise in the counterweight 10 and the activity of the catalyst can be efficiently performed.
[0062]
【The invention's effect】
As described in detail above, the present invention according to claim 1 Construction equipment with built-in counterweight According to Cooling the exhaust silencer to reduce the temperature of exhaust gas from the exhaust pipe protruding outside the machine can do.
[0063]
Furthermore, the noise radiated from the exhaust gas reducing device main body can be blocked by the counterweight. Also Since the exhaust gas reduction device and the engine are connected by a flexible tube, vibrations of the engine can be absorbed and transmission of the vibrations to the exhaust gas reduction device can be prevented. Thereby, the noise which leaks outside the construction machine can be suppressed to the minimum.
[0064]
Claim 2 According to the construction machine in which the exhaust gas reduction device of the present invention described above is built in the counterweight, Exhaust silencer And the counterweight can be prevented from interfering with each other. Thereby, the noise which leaks outside the construction machine can be suppressed to the minimum.
[0065]
Claim 3 According to the construction machine having the exhaust gas reduction device of the present invention described above incorporated in the counterweight, Or 2 In the described configuration, it is possible to prevent thermal damage due to the high temperature of the electrical equipment disposed in the recess.
[0066]
Claim 4 According to the construction machine in which the exhaust gas reducing device according to the present invention is incorporated in the counterweight, 3 Either 1 item In the configuration described in (1), since at least the inside of the recess is ventilated by the negative pressure generated at the suction hole portion by the cooling air flow supplied by the cooling fan, the ventilation in the recess can be improved.
[0075]
Claim 5 According to the construction machine with the exhaust gas reduction device of the present invention described in the counterweight built in, 4 In the configuration described above, 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 in the counterweight.
[Brief description of the 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 where a counterweight built-in exhaust gas reducing device for a construction machine according to the present invention is applied to a hydraulic excavator that is a construction machine. It is.
2 is a schematic explanatory view showing a plan view taken along the line 2A-2A in FIG.
FIG. 3 is a schematic explanatory view showing an exhaust gas reduction device mounting configuration showing a longitudinal sectional view taken along the arrow 3A in FIG. 2;
4 is a schematic explanatory diagram showing an enlarged view of the exhaust gas reduction device mounting configuration of FIG. 3; FIG.
FIG. 5 is a schematic explanatory view showing a second embodiment of the present invention and showing a state similar to that in FIG. 3;
FIG. 6 shows an application example of an arrangement portion of the exhaust gas reduction device and the exhaust silencer of the first and second embodiments of the present invention. FIG. 6A shows the exhaust gas reduction device and the exhaust silencer inside the counterweight. Schematic explanatory diagram showing the case of being arranged in series, (B) is a schematic sectional view showing another application example of FIG. 6 (A), (C) is a schematic explanatory diagram showing an arrow 6C of FIG. 6 (B) , (D) shows another application example, and is a schematic explanatory view showing the same state as FIG. 6 (A).
7 is a schematic explanatory view showing another application example of the first embodiment and showing a state similar to that in FIG. 3; FIG.
8 is a schematic explanatory view showing an enlarged view of the exhaust gas reduction device mounting structure of FIG. 7; FIG.
9A and 9B show a heat insulation method for the exhaust silencer, and FIG. 9A is a schematic explanatory view showing a state in which a radiator cooling water pipe is disposed along the outer periphery of the exhaust exhaust silencer of FIG. FIG. 10 is a schematic explanatory view showing a state in which glass wool is attached to the inner peripheral wall of the exhaust / exhaust silencer shown in FIG.
FIG. 10 is a schematic explanatory view showing a plan view of the vicinity of an engine room of a conventional hydraulic excavator.
11 is a schematic explanatory view showing a longitudinal section in which a part of FIG. 10 is cut away. FIG.
[Explanation of symbols]
2 Upper swing body
4 Lower traveling body
6 Working device
8 Cab
10 counterweight
11 recess
11a, 11b Opening of recess
12 engine room
13 Partition plate (partition wall)
13a Partition plate (upper partition wall)
13b Lower bulkhead
14 Intercooler
15 arms
15a bracket
17a-17d Exhaust pipe
17f induction tube
17F Flexible means (flexible pipe, rotary pipe joint)
17K clamp
17p Volt
17t end
16 Oil cooler
18 Radiator
18c piping (cooling water piping)
20 Cooling fan
21 Flange
22 engine
22a Engine block
25 volts
38 Exhaust silencer
38a Flange
39 Brackets for exhaust silencers and exhaust gas reduction devices
39a Lower bracket
39b Upper bracket
39f flange
40 Exhaust gas reduction device
40a Reduction catalyst device
40b Oxidation catalyst device
h Suction hole
hi air intake hole
S1, S2, S3 gap

Claims (5)

A counterweight provided at the rear end of the upper swing body,
An engine room provided in front of the counterweight;
An engine housed in the engine room and a cooling device for the engine;
A recess formed in the counterweight;
An exhaust gas reduction device for the engine disposed in the recess;
An exhaust silencer disposed in the recess and connected to the exhaust gas reduction device ;
A flexible pipe for connecting the engine and the exhaust gas reduction device to absorb relative motion of the engine and the exhaust gas reduction device ;
Exhaust gas reduction characterized in that a pipe through which a cooling medium cooled in the cooling device circulates is disposed along an outer periphery of at least the exhaust silencing device of the exhaust silencing device and the exhaust gas reducing device. Construction machinery with built-in equipment in the counterweight. An arm member for fixing the exhaust gas reduction device to the engine;
An exhaust pipe one end is connected to the exhaust muffler to discharge the exhaust gas from the exhaust muffler,
Separate from the exhaust pipe, discontinuously provided to overlap with the outer periphery of the other end of the exhaust pipe so that the exhaust gas discharged from the exhaust pipe exits the recess A construction machine having the counterweight built in the exhaust gas reduction device according to claim 1, further comprising: The construction in which the exhaust gas reducing device according to claim 1 or 2 is incorporated in a counterweight, wherein a pipe through which a cooling medium cooled in the cooling device flows is disposed along the inner wall of the concave portion. machine. A partition plate provided to divide the engine room and the recess;
The exhaust gas reducing device according to any one of claims 1 to 3 , further comprising a suction hole provided in the partition plate for ventilating from the recess to the engine room side. Built-in construction machine. A closing member for opening and closing the suction hole;
Urging means for urging the closing member in a direction to close the suction hole;
A temperature sensor for detecting the temperature in the recess;
An opening means for operating the closing member in a direction to open the suction hole against the urging force of the urging means when the temperature sensor detects that the temperature in the recess is equal to or higher than a predetermined temperature. The construction machine which incorporated the exhaust gas reduction device according to claim 4 in the counterweight.

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