JP2000145455A - Construction machine cooling system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve reliability of hydraulic equipment and performance of a cooling system, a cooling fan and engine cooling, and reduce noise in a cooling system of a construction machine. SOLUTION: An operator room 15 is installed at one side 1a of a front part of a construction machine. An engine 8 is transversely mounted between a counter weight 27 and the operator room 15. A cooling equipment, either an oil cooler 50x or a radiator 40 that are mounted forward of the engine 8, and a first cooling fan 52 are installed. The cooling equipment other than the mentioned above mounted on the other side 1b opposite to the side 1a and a second cooling fan 53 are installed. Either a fuel tank 31 or a hydraulic oil tank 30 is mounted between either the one cooling equipment or the first cooling fan and the operator room 15. In addition, the other tank is mounted between the engine 8 and the other cooling equipment. Thereby, an engine room ER comprising partitions surrounding the engine 8 is installed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling device for construction machines such as a hydraulic shovel, a self-loader, a bulldozer, a wheel loader, a crawler type loader, an agricultural machine, etc. (hereinafter simply referred to as a construction machine).

[0002]

2. Description of the Related Art Wheel loaders such as hydraulic excavators, self-loaders, and bulldozers, and construction machines such as track type loaders are well known for excavating rocks such as dams, tunnels, rivers, and roads in mountainous areas, and for building and building. It is used for demolition of objects, etc., in extremely high atmospheric temperature under the scorching sun, and under severe conditions with poor scaffolding and ground surface at the work site, overloading at the maximum capacity limit for the above construction machine. In many cases, continuous operation is forced to prevent such problems.

The structure of the above construction machine is composed of an upper body, a lower traveling body, and a working device. This will be described, for example, with respect to a hydraulic shovel. As shown in FIGS. 5 and 6, the basic structure of the hydraulic excavator includes an upper revolving unit 2 which is formed so that the upper vehicle body can be pivoted, a lower traveling unit 4 provided below the upper revolving unit 2, and various operations. Work equipment 6
The upper revolving unit 2 includes the engine 8,
Hydraulic device (not shown), swivel device 12, operator room 15
The lower traveling body 4 is a car body 1
6, a track roller frame 18, a traveling device 20, and other suspension devices (not shown). The working device 6 further includes a boom 24 for supporting a bucket 22, and an arm 2.
5 and various hydraulic cylinders and link rods for operating the same, and includes the turning device 12, the traveling device 20, and the like, and 11 is an engine hood.

A device for operating the hydraulic excavator includes the traveling device 20, the turning device 12, and the working device 6 described above.
The power transmission of each of these devices is performed by converting the power of the engine 8 into hydraulic pressure by a hydraulic pump 26. In the traveling device 20, a traveling motor is operated via a swivel joint (not shown) to transmit the signal to the truck 28. In the turning device 12, a turning motor (not shown) is operated and transmitted to a turning gear. In the working device 6, the operation of the hydraulic excavator is performed by transmitting the hydraulic excavator to various hydraulic cylinders and the like.

[0005] As shown in FIGS. 5 and 6, the flow of hydraulic oil supplied from the hydraulic pump 26 to the working devices 6 such as the boom 24, the arm 25, the traveling device 20, and the turning device 12 is controlled. A control valve 70 and a pipe 7 connecting the control valve 70 and the working device 6.
3, 74 and a fuel tank 3 for supplying fuel to the engine 8
1, a hydraulic oil tank 30 for storing the hydraulic oil sucked into the hydraulic pump 26, a supply pipe 76 connecting the hydraulic oil tank 30 and the hydraulic pump 26, and a hydraulic pump 26.
A delivery hose 78 connecting the oil cooler 50 to the control valve 70; an oil cooler pipe 75 connecting the control valve 70 to the oil cooler 50;
And a long oil cooler pipe 77 for connecting the oil cooler 30 with the hydraulic oil tank 30.

As described above, for example, about 140 to 30 discharged from the hydraulic pump 26 driven by the engine 8
The hydraulic oil pressurized to 0 kg / cm ² is controlled by the control valve 70 and transmitted to each of the above devices to become low-pressure oil, returns to the hydraulic oil tank 30 via the control valve 70 again, and is again operated by the hydraulic pump 26. It is being circulated.

Further, the construction machine has a self-propelled ability, but in order to improve the traveling performance, the entire horsepower of the engine can always be converted into a hydraulic horsepower even if the discharge pressure changes due to a change in load conditions during traveling. It has become. Therefore, as described above, during operation of the construction machine, the hydraulic pump 26
Is controlled so that it can output the maximum capacity, and the construction machine often operates continuously throughout the day in a limit area where overload is not caused.

Therefore, when the hydraulic oil is discharged from the hydraulic pump 26, the above operation is performed, and when the oil returns to the oil cooler 50 side, its temperature rises to a maximum of about 90 to 100 ° C., so that the oil is continuously used. In this case, the components of the hydraulic oil may be destroyed due to the high temperature, and the hydraulic oil may be degraded. In addition, the seal of the hydraulic device may be broken, and the hydraulic device may be damaged.

[0009] Therefore, the operation oil is returned as described above, and the returned hydraulic oil is superposed on the front surface of the cooling water radiator 40 of the engine 8 as shown in FIG. It is cooled by the cooler 50, returned to the hydraulic oil tank, and circulated again in the above-mentioned path.

[0010]

However, an oil cooler (hereinafter referred to as an oil cooler) 50 for the above-mentioned hydraulic oil.
The cooling fan 5 of the radiator 40 is provided in front of a radiator 40 for cooling water of the engine 8 (hereinafter referred to as a radiator).
The cooling air sucked by the cooling fan 52 from the cooling air inlet 46 cools the oil cooler 50, the radiator 40, the engine 8, and the hydraulic pump 26. , Cooling air outlet 46
a.

As a result, the cooling air, which has passed through the oil cooler 50 and cooled the high-temperature hydraulic oil, has become considerably hot, and cools the radiator 40 again.
The cooling capacity for the cooled high-temperature engine cooling water is reduced. Therefore, when an attempt is made to increase the surface area of the oil cooler 50 to improve the cooling capacity, the effective cooling area through which the oil cooler 50 directly ventilates the radiator 40 is further reduced, and the engine cooling capacity is reduced as described above. Will be reduced.

The oil cooler 50 and the hydraulic oil tank 30
The oil cooler 50 and the hydraulic oil tank 3
The length of the oil cooler pipe 77, which is zero, increases the pressure loss, and the pipe becomes troublesome. Further, in the layout shown in FIG. 6, since the cooling fan 52 is located immediately behind the operator room 15, the oil cooler 50 and the radiator 40 overlap to increase the flow resistance. The air volume must be increased, and thus the noise of the operator room 15 and the construction machine increases.

The present invention has been made in view of these problems, and has an operator room disposed on one side of a front end in the front-rear direction of a construction machine, and a counterweight provided at a rear portion of the construction machine. One of the above-mentioned oil coolers, radiators, etc., which is disposed between the engine room and the operator room and to which a hydraulic pump is connected, and which is disposed in front of the engine. And a first cooling fan having a driving means for cooling the one of the coolers, and the other one of the coolers disposed on the other side opposite to the one side. And a second cooling fan having a driving means for cooling the other cooler, and disposed at a rear portion of the operator room between the one cooler or the first cooling fan and the operator room. Fuel tank and crop One of the oil tanks is provided, and the other is provided between the engine or the hydraulic pump and the other cooler and is arranged along the engine so as to be substantially parallel to the one tank. It is an object of the present invention to provide a cooling device for a construction machine which is provided with a tank and an engine room constituted by a partition wall which surrounds the engine, thereby improving the cooling performance and the fire prevention.

[0014]

According to the first aspect of the present invention, there is provided a cooling apparatus for a construction machine according to the present invention, wherein high-pressure hydraulic oil from a hydraulic pump driven by an engine mounted on the construction machine is supplied to the construction machine. And a radiator that cools the engine coolant and an oil cooler that cools the high-temperature working oil that is returned to the traveling device and the working device. The hydraulic pump is connected horizontally between an operator room disposed on one side of a front end in the front-rear direction of the machine and a counter weight provided on a rear portion of the construction machine and the operator room. Engine, one of the oil cooler and the radiator cooler disposed in front of the engine, and a drive for cooling the one cooler. A second cooling unit having a first cooling fan having a step, another cooling unit of the cooling unit disposed on the other side opposite to the one side unit, and a driving unit for cooling the other cooling unit; A fan, any one of a fuel tank and a hydraulic oil tank disposed at the rear of the operator room between the one of the coolers or the first cooling fan and the operator room, and the engine or The other of the fuel tank and the hydraulic oil tank provided between the hydraulic pump and the other cooler and arranged along the engine so as to be substantially parallel to the one tank; And an engine room formed by a partition wall surrounding the engine.

According to a second aspect of the present invention, in the cooling device for a construction machine according to the first aspect, the engine room includes a rear partition provided between the hydraulic pump and the engine, Forward and radiator or first
A front partition provided between the cooling fan, a front partition provided between respective front sides of the front partition and the rear partition, and a rear of each of the front partition and the rear partition. And a rear side partition provided between the side portions.

According to a third aspect of the present invention, there is provided a cooling device for a construction machine according to the first or second aspect, wherein the cooling device is arranged substantially in a row between the one tank and the other tank and along the engine. A control valve for controlling the hydraulic oil provided, and at least one of the one tank, the other tank and the control valve, both of the tanks and the front side partition of the engine room, A separating wall that serves as a cooling air passage of at least one of the coolers.

According to a fourth aspect of the present invention, there is provided a cooling device for a construction machine according to the third aspect, wherein the cooling air inlet of the cooling air passage formed between the front side partition and the isolation wall is provided. It is characterized in that it is configured to widen from the side toward the cooling air outlet side. According to a fifth aspect of the present invention, there is provided a cooling device for a construction machine according to any one of the first to third aspects, wherein the one tank is provided at a rear portion of the operator room provided on the one side. And the upper part of the one tank is formed in a step shape.

According to a sixth aspect of the present invention, there is provided a cooling device for a construction machine according to any one of the third to fifth aspects, wherein the cooling device comprises at least the two tanks out of the two tanks and the control valve. The partition wall substantially opposing the front side partition of the engine room is formed of a substantially continuous surface. According to a seventh aspect of the present invention, there is provided a cooling device for a construction machine according to the present invention.
In the configuration according to any one of the above, the driving means for the first and second cooling fans is a hydraulic motor, an electric motor,
It is characterized by being configured to be driven by any of the above engines.

According to an eighth aspect of the present invention, there is provided a cooling device for a construction machine according to any one of the first, second, fifth, and seventh aspects of the present invention, wherein the cooler is disposed in the engine. The cooling device is at least one of an intercooler for a supercharger, the radiator, and a cooling device for the oil cooler. According to a ninth aspect of the present invention, there is provided a cooling device for a construction machine according to any one of the first to third, fourth, sixth, and eighth aspects, which faces the other cooling device or the second cooling fan. The contact area between the side surface of the hydraulic oil tank and the cooling air is increased.

According to a tenth aspect of the present invention, there is provided a cooling device for a construction machine according to any one of the first to fourth and ninth aspects, wherein the other cooling device and the second cooling fan are provided in the construction device. It is characterized in that it is arranged on the other side part toward the front of the machine. According to a eleventh aspect of the present invention, there is provided a cooling device for a construction machine according to any one of the first to third, sixth, ninth, and tenth aspects, wherein An exhaust outlet end portion, and an ejector including a suction pipe provided at a partition wall constituting the engine room while projecting longer than the exhaust outlet end portion with an interval from at least the exhaust outlet end portion. It is characterized in that the heating air in the engine room is sucked and discharged to the outside by using the exhaust pressure.

[0021]

Embodiments of the present invention will be described below with reference to the drawings. A case where the cooling device for a construction machine of the present invention is applied to a hydraulic excavator will be described with reference to FIGS. FIG. 1 is a schematic plan view showing one embodiment of the present invention, and FIG.
FIG. 3 is a schematic explanatory view showing a modification of the embodiment of FIG. 1, and FIG. 4 is a view A in FIG.
FIG.

As shown in FIG. 1 and FIG.
The upper traveling body 2 is rotatably mounted on the vehicle, and high-pressure hydraulic oil from a hydraulic pump 26 driven by an engine 8 mounted on the construction machine is supplied to the traveling device 20 of the construction machine.
A cooling device for a construction machine is provided which includes an oil cooler 50 for cooling the high-temperature working oil that is transmitted to the working device 6 and returned to the outside and a radiator 40 for cooling the cooling water of the engine 8. .

An operator room 15 is provided on one side 1a of the front end of the construction machine in the front-rear direction, and is disposed horizontally between a counter weight 27 provided at the rear of the construction machine and the operator room 15. And has at least one of a cooler such as an oil cooler 50, a radiator 40, and an intercooler IC, which are disposed in series in front of the engine 8 to which the hydraulic pump 26 is connected. In the present embodiment, a radiator 40 is provided.

The first cooling fan 52 includes a first cooling fan 52 for cooling the radiator 40, which is one of the cooling units, and a driving unit 51 for driving the first cooling fan 52. 8 is applied to the driving means 51. Further, an oil cooler 50, a radiator 40, and an intercooler I provided on the other side 1b opposite to the one side 1a.
C or the like, and has at least one of the other coolers out of the coolers such as C.
Are provided, and a second cooling fan 53 for cooling the oil cooler 50 and a driving means 51 for driving the second cooling fan 53 are provided.
And the like.

The radiator 40 or the first cooling fan 5
At the rear of the operator room 15 in the space between the operator room 2 and the operator room 15, one of the fuel tank 31 and the hydraulic oil tank 30, a fuel tank 31 in this embodiment, is provided. Hydraulic pump 2
The other one of the two tanks (hydraulic oil tank) arranged along the engine 8 so as to be substantially parallel to the one tank with a space between the oil cooler 6 and the oil cooler 50. 30 are provided.

A front partition Wc is provided between the engine 8 and the hydraulic pump 26, and a front partition Wa is provided between the first cooling fan 52 and the front side of the engine 8, and the front partition Wa and the rear partition Wc are provided. A front side partition Wfb extending in the vehicle width direction is provided so as to bridge each front side of the construction machine in the front direction, and the respective rear sides of the construction machine of the front partition Wa and the rear partition Wc are provided. A rear side partition Wrb extending in the vehicle width direction is provided so as to bridge the above, and the above-mentioned front partition Wa, rear partition Wc, front side partition Wfb, rear side partition Wrb, and engine hood 11 (or separately) Engine room E composed of upper partition We) and the like provided
R is provided.

In the present embodiment, the rear side partition Wrb is also used as the front surface of the counterweight 27. In addition, as shown in FIG.
0 and a fuel tank 31, a control valve 70 for controlling the hydraulic oil, which is arranged along the engine 8 and is arranged along the engine 8, is provided if necessary. A partition plate SP1 provided between the fuel tank 31 and the rear surface 70b of the control valve 70 facing the engine 8 is provided.

Then, the fuel tank 31 and the hydraulic oil tank 3
0 and the control valve 70 or the partition wall SP1 are disposed substantially continuously, and an isolation wall S1 and a front partition wall W are formed.
a and the front side partition Wfb constitute a cooling air passage S. Further, partition walls SP2 and SP3 extending from the side of the radiator 40 to the cooling air inlet 46 or the counter weight 27 on the side of the construction machine are provided to improve the suction efficiency.

The flow of the cooling air is accelerated from the cooling air inlet 46 toward the cooling air outlet 46b and discharged outside the machine, so that the cooling effect is enhanced. Also, as shown in FIG. 2, a lattice-shaped cooling air outlet 46c provided at an appropriate position above the upper cover 2uc between the radiator 40 and the front partition Wa, and an appropriate position corresponding to the cooling air passage S. Grid cooling air outlet 4
6d may be provided, and the cooling air outlet 46a,
The cooling air is discharged from at least one of the cooling air outlets 46b, 46c, 46d and the outlet 46e discharged to the control valve 70 side.

Further, a plurality of inlets may be provided in the front partition Wa on the front side of the engine 8 for taking in the cooling air in the engine room ER.
Is designed to provide a dedicated cooling fan for the engine 8 and exhaust the cooling air from a cooling air outlet 46K provided on the right side of the engine hood 11. And the isolation wall S1
The rear surface 70b of the control valve 70 and the rear surface 30b of the hydraulic oil tank 30 are formed as, for example, substantially continuous surfaces, as shown by a two-dot chain line in FIG. 1, so that the flow of the cooling air is performed smoothly. It is configured to provide a cooling effect.

Also, as shown in FIGS. 1 and 2, a shroud 47 may be provided so that the cooling air can be introduced smoothly, and the outer surface of the fuel tank 31 is formed into a curved surface. You may make it substitute. Further, the above-mentioned separating wall S1 may be, for example, a modified example as shown in FIG. 3, and may be constituted by a shroud 47, an isolating wall S1, and a hydraulic oil tank 30 so as to be inclined toward the outlet 46b. Well, furthermore, the front side partition Wfb of the engine room ER
The radiator 40 side has a curved surface shape P as shown in FIG.
2 and the cooling air passage S is provided with a cooling air outlet 4
The cooling effect is increased by diverging toward 6b.

The radiator 40 and the first cooling fan 5
By inclining the cooling air in the direction of the cooling air passage S as shown in FIG. 3, the cooling air flows effectively and the cooling effect is improved. In the above embodiment, the radiator 4 provided on the construction machine
0, a first cooling fan 52, and a recess 90 formed by recessing at least a portion of the counterweight 27 facing the engine 8 to the rear of the construction machine.
The space for disposing the first cooling fan 52 and the engine 8 is enlarged.

Then, as shown in FIG. 3, if the sound insulating material 91 is provided on the partition wall S1 forming the cooling air passage S or on the inner surface of the engine room ER, the sound of the cooling air intake and the first cooling fan 52 are provided. Can be reduced. The engine room includes the front partition Wa, the rear partition Wc, the front partition Wfb, the rear partition Wrb (counter weight 27), and the engine hood 11 (or a separately provided upper partition We). Since the engine 8 is arranged so as to be isolated from other parts by the ER, the operating noise of the engine 8 does not leak to the outside, so that the construction machine can be made quieter.

When it is necessary to cool the engine room ER, for example, an opening is provided on the front side of the engine 8 or a partition wall of the engine room ER, and a small cooling fan is provided at an appropriate position to discharge the gas from the opening. For example, appropriate measures can be taken. Further, since the cooling air passage S is formed by the partition wall S1 and the front side partition Wfb, the one cooler can be effectively cooled.

As shown by the solid lines in FIGS.
When the cooling fan 53 is arranged so as to face the front of the construction machine, the cooling air taken in from the second cooling fan 53 cools the hydraulic oil tank 30 and then cools the hydraulic pump 26 to be provided on the side. Since the cooling air is discharged from at least one of the cooling air outlets 46a and 46b, the cooling effect can be increased.

Since the present embodiment is constructed as described above, the construction machine performs the above-mentioned operation as shown in FIG.
When the operating oil that has become high temperature (maximum 90 to 100 ° C.) enters the oil cooler 50, it is cooled by the cooling air sucked by the second cooling fan 53, and the cooling air is further cooled by the control valve 70 or the like. Since the hot air in the vicinity of the hydraulic oil tank 30 flows while being sucked, the air flows through the control valve 70, the hydraulic oil tank 30, and the outer surface of the front side partition Wfb, cools the engine room ER, and is discharged outside the machine. .

On the other hand, as shown in FIG. 1, the first cooling fan 52 allows the
The cooling air introduced from the chiller cools the engine cooling water with the radiator 40, cools the control valve 70 and the hydraulic oil tank 30 as described above, and is discharged outside the machine from the cooling air outlet 46b. However, since the cooling air that has cooled the oil cooler 50 and the radiator 40 is configured to flow in such a manner that the discharge directions of the cooling air are substantially orthogonal to each other and are discharged to the cooling air outlets 46a and 46b, The two cooling airs can be discharged efficiently by synergistic effects of the air, so that the two cooling airs can be efficiently discharged, the cooling performance of the two cooling machines 40 and 50 can be improved, and the radiator 40 and the oil cooler can be improved. 50 can be made smaller.

Accordingly, the oil cooler 50, the radiator 40, or the intercooler IC for the supercharger, the radiator 40, and the oil, which are provided as required according to the design specifications as shown by the two-dot chain line in FIGS. Cooler 50
The other one of the coolers separated from and independent of at least one of the coolers is driven by any one of drive means 51 such as a newly installed hydraulic motor, electric motor, and engine. It is cooled by the second cooling fan 53.

Further, since the cooling air that has cooled the remaining one cooler that is not separated and independent does not re-cool the other cooler again, the cooling performance can be improved. The intercooler IC provided as needed in the engine 8 is provided in a space in front of the radiator 40 or in a space in front of the oil cooler 50 as shown by a two-dot chain line in FIGS. The construction machine can improve the cooling effect and can be manufactured compactly.

In the above embodiment, the oil cooler 50 is used.
Is arranged toward the side of the other side portion 1a of the construction machine as shown in FIG. 2, the flow directions of the cooling air of the oil cooler 50 and the radiator 40 are different, and the cooling air is independently cooled. Therefore, the cooling effect can be increased.
In addition, as described above, the cooling device including a plurality of devices is separated and independent, and a cooling fan is provided for each.
Considering one of the second cooling fans 52 and 53, the air passage pressure loss in the cooling air passage S is reduced, and the horsepower of the same cooling fan increases the air volume and further improves the cooling capacity. it can.

By disposing the first and second cooling fans 52 and 53 farthest from the operator room 15 at the rear of the vehicle body and at the other side 1b, the operator room 15
Noise in the interior can be reduced. Further, even if the horizontal engine described in the present embodiment is disposed in the left-right reverse direction,
It is possible to obtain substantially the same operation and effect as the above embodiment.

Therefore, according to the present invention, as described above, the engine cooling performance is improved, and the first and second cooling fans 52, 53 are provided.
By reducing the number of revolutions, the noise can be reduced, and if the noise is equivalent, the radiator 40 and the oil cooler 50 can be reduced in size, and the cost can be reduced. Also, as shown by a two-dot chain line in FIGS. 1 and 3, the hydraulic oil tank 30 is formed into, for example, a parabolic three-dimensional column 30a having an ellipsoidal sphere or a parabolic cross section, or a triangular column (not shown). As shown by a solid line in FIGS. 1 to 3, the oil cooler 5 is directed toward the front of the construction machine.
0 and the second cooling fan 53, the second cooling fan 5
Since the cooling area of the working oil tank 30 for the cooling air from 3 increases, the working oil in the working oil tank 30 can be effectively cooled.

Further, as shown in FIG.
6. Since the control valve 70, the oil cooler 50, and the hydraulic oil tank 30 are arranged close to each other, the oil cooler pipe can be shortened, and the pressure loss of the hydraulic oil is small, so that the pipe can be easily formed. Also, on the upper surface of the fuel tank 31 disposed at the rear of the operator room 15 shown in FIGS. 1 and 3, stairs 31a, 31b and 31c for the operator and the like to go up and down from the side of the construction machine rise rightward. Since the hydraulic oil tank 30 is also used as a stair for lifting and lowering, the hydraulic oil tank 30 can be formed compactly and inexpensively.

Further, in addition to the above, in the exhaust system of the engine 8 as shown in FIG.
A muffler M is disposed at a part of the upper partition wall We (or the engine hood 11) of the engine room ER where the outlet of the muffler M is disposed by using the engine exhaust pressure discharged to the outside. Ejector E composed of an outer pipe and an inner pipe that sucks heated air in engine room ER and discharges it to the outside
When J is provided, the engine room ER, the engine 8 and the like can be cooled more effectively, and the cooling efficiency can be improved.

The engine 8 is a turbocharger 1 which is a supercharger provided as needed as shown in FIG.
02 is connected, and the air supercharged by the turbocharger 102 is supplied to the intercooler IC through the pipe 104 through the air outlet 27a of the turbocharger 102, and the supercharged fluid is cooled by the intake air of the engine 8. It is configured to be supplied from the supply port 27b of the tube.

The intercooler IC and the first cooling fan 5
2 is not limited to the front of the engine 8, and may be provided at a position behind the engine 8 or above the engine 8. The ejector EJ is provided with an exhaust pipe 8a extending from the muffler M as an inner pipe protruding from the muffler M.
The exhaust outlet end M1 of the engine room ER and the exhaust outlet end M1 from the engine room ER with a space around the exhaust outlet end M1.
It is constituted by a suction pipe M2 as an outer pipe protruding longer, and a suction gap M3 formed between the exhaust outlet end M1 and the suction pipe M2 to suck air in the engine room ER. .

Further, the ejector EJ is provided with a plurality of slit-shaped intake ports R1 as necessary in the bottom partition wall Wd of the engine room ER located on the opposite side of the engine room air passage EY. If the ventilation in the engine room ER is promoted, the cooling efficiency can be improved. Each of the intake ports R1 has a looper R as a noise suppression means NS for suppressing leakage of engine noise to the outside of the engine room ER. The loopers R are formed by cutting and raising from each of the intake ports R1. Have been.

Further, although not shown, the noise suppressing means NS has a sound absorbing effect at the intake port R1 formed in, for example, a box shape, and the engine noise and the intake noise leaking from the intake port R1 to the outside of the engine room ER. May be suppressed. Therefore, a negative pressure is generated around the engine exhaust flow ejected from the exhaust outlet end M1 of the exhaust pipe 8a provided in the engine 8, and the suction gap M3 becomes negative. Engine room ER
The air inside can be sucked together with the heat and forced out of the machine.

[0049]

As described above in detail, according to the cooling apparatus for a construction machine according to the first aspect of the present invention, the high-pressure hydraulic oil from the hydraulic pump driven by the engine mounted on the construction machine is used. A cooling device for a construction machine, comprising: an oil cooler that cools the high-temperature working oil that is transmitted back to a traveling device, a working device, and the like of the construction machine and returns, and a radiator that cools cooling water of the engine. An operator room disposed on one side of a front end in the front-rear direction of the construction machine; and the hydraulic pump disposed horizontally between a counter weight provided at a rear portion of the construction machine and the operator room. Connected to the engine, one of the oil cooler and the radiator cooler disposed in front of the engine, and a drive for cooling the one cooler. A first cooling fan having a first cooling fan, a second cooling device disposed on the other side of the cooling device, and a second cooling device having a driving device for cooling the other cooling device. A fan and one of the above coolers or the first
Between the cooling fan and the operator room, one of a fuel tank and a hydraulic oil tank disposed at the rear of the operator room, and between the engine or the hydraulic pump and the other cooler. An engine room that is provided with the other of the fuel tank and the hydraulic oil tank disposed along the engine so as to be substantially parallel to the one tank and a partition wall surrounding the engine; Therefore, the cooling performance of each of the coolers is improved by separately arranging the respective coolers, and the noise can be reduced by lowering the rotation speed of the cooling fan. A radiator having a cooling performance equivalent to that of a cooling fan can be reduced in size and cost.

Further, since the above-described engine is provided in the engine room and disposed so as to be isolated, leakage of the noise during operation of the engine to the outside is reduced.
According to the cooling device for a construction machine of the present invention described in claim 2,
The engine room according to claim 1, wherein the engine room has a rear partition provided between the hydraulic pump and the engine, and a front partition provided between a front of the engine and a radiator or a first cooling fan. A front side partition provided between the front side of the front partition and the rear partition, and a rear side partition provided between the rear side of the front partition and the rear partition. Therefore, in addition to the effect of claim 1, since the engine is disposed so as to be isolated from other parts of the construction machine, noise that the engine operates may leak to the outside. And a quiet construction machine can be built.

According to a third aspect of the present invention, in the cooling device for a construction machine according to the first or second aspect of the present invention, the cooling device is arranged substantially horizontally between the one tank and the other tank and along the engine. A control valve for controlling the hydraulic oil disposed in the first and second tanks, and at least one of the one tank, the other tank, and the control valve, the two tanks and the front partition wall of the engine room; Since the partition wall serving as a cooling air passage of at least one of the coolers is configured, in addition to the advantageous effects of claim 1 or 2, the at least one cooler is efficiently cooled and the front side is cooled. The side partition, hydraulic oil tank and control valve can be cooled.

According to a fourth aspect of the present invention, in the cooling apparatus for a construction machine according to the third aspect, the cooling air passage formed between the front side partition and the isolation wall is cooled. Since the cooling air is configured to widen from the air inlet side to the cooling air outlet side, the cooling air can be accelerated and the cooling effect can be increased in addition to the effect of the third aspect. According to a fifth aspect of the present invention, there is provided a cooling device for a construction machine according to any one of the first to third aspects, wherein the one tank is provided at a rear portion of the operator room provided on the one side. Since the upper part of the one tank is disposed in a step-like manner, in addition to the effects of claims 1 to 3, by getting on and off the upper part of the one step-like tank, Maintenance and inspection can be performed easily.

Further, since the one tank serves as a soundproof wall, transmission of the rotation noise of the first cooling fan and the engine to the operator room and outside the machine can be reduced. According to the construction machine cooling device of the present invention described in claim 6, in the configuration according to any one of claims 3 to 5, the cooling tank is formed by at least the two tanks of the two tanks and the control valve. Since the partition wall substantially opposed to the front side partition of the engine room is formed of a substantially continuous surface, in addition to the effects of claims 3 to 5, the flow of the cooling air becomes smoother and the cooling effect increases. I can do it.

According to the cooling device for a construction machine of the present invention described in claim 7, in the configuration according to any one of claims 1, 2, 4, and 6, the first and second cooling fans of the first and second cooling fans are provided. The driving means is configured to be driven by any one of a hydraulic motor, an electric motor, and the engine. By controlling the other cooler on the body, the cooling performance of each cooler can be improved.

According to an eighth aspect of the present invention, in the construction machine cooling apparatus according to any one of the first, second, fourth, and seventh aspects, the cooling machine is disposed in the engine. Since the cooling device is at least one of a cooling device such as an intercooler for a turbocharger, the radiator, and the oil cooler, in addition to the effects of any one of claims 1, 2, 5, and 7, Even if the above intercooler is installed,
Since the above oil cooler, radiator and intercooler can be efficiently cooled and the cooling performance can be improved,
Since the shape of each of the coolers can be reduced in size, and the rotation speeds of the first and second cooling fans of the coolers can be reduced, the generation of noise can be reduced.

According to the cooling device for a construction machine according to the ninth aspect of the present invention, in the configuration according to any one of the first to third, fourth, sixth and eighth aspects, the other cooling device or the second cooling device can be used. 2
Since the configuration is such that the contact area between the side surface of the hydraulic oil tank facing the cooling fan and the cooling air is increased, in addition to the effects of any of claims 1 to 3, 4, 6, and 8, Since the hydraulic oil can be effectively cooled from the outer peripheral surface of the hydraulic oil tank, the cooling performance can be improved and the size can be reduced in combination with the oil cooler, and the cost can be reduced.

According to a tenth aspect of the present invention, in the construction machine cooling device according to the first aspect, the other cooling device or the second cooling fan is connected to the second cooling fan. Since it is arranged on the other side portion toward the front of the construction machine, in addition to the effects of any one of claims 1 to 4, 9
Since the two cooling airs from the first and second cooling fans act in a direction of drawing out each other due to a synergistic effect of the two cooling airs, the two exhaust airs after the cooling can be efficiently discharged,
The cooling performance of the two coolers can be improved.

According to the cooling device for a construction machine of the present invention described in claim 11, in the configuration according to any one of claims 1 to 3, 6, 9, and 10, the cooling device is disposed in the engine room. An ejector comprising an exhaust outlet end of an exhaust pipe of an engine, and a suction pipe provided at a partition wall constituting the engine room while protruding longer than the exhaust outlet end at least apart from the exhaust outlet end. Since the heating air in the engine room is sucked and discharged to the outside by using the exhaust pressure of the engine, the effect of any one of claims 1 to 3, 6, 9, and 10 can be obtained. In addition, each part in the engine room can be effectively cooled.

[Brief description of the drawings]

FIG. 1 is a schematic plan view showing one embodiment of the present invention and showing a case where a cooling device for a construction machine of the present invention is applied to a hydraulic shovel.

FIG. 2 is an enlarged explanatory view showing a state where a part of a cover of the upper swing body in FIG. 1 is enlarged.

FIG. 3 is a schematic explanatory view showing a modification of FIG. 1;

FIG. 4 is a schematic explanatory view showing an arrow A in FIG. 3;

FIG. 5 is a schematic perspective view showing a conventional hydraulic excavator.

FIG. 6 is a schematic explanatory view showing the plane of FIG. 5;

[Explanation of symbols]

 2 upper revolving unit 4 lower traveling unit 6 working device 8 engine 11 engine hood 12 revolving device 15 operator room 16 car body 18 track roller frame 20 traveling device 22 bucket 24 boom 26 hydraulic pump 30 hydraulic oil tank 30a front surface of hydraulic oil tank 31 Fuel tank 40 Radiator 46 Cooling air inlet 46a Cooling air outlet 46b Cooling air outlet 46c Cooling air outlet 46d Cooling air outlet 46e Cooling air outlet 50 Oil cooler 52 First cooling fan 53 Second cooling fan 70 Control valve ER Engine room IC Intercooler S Cooling air passage S1 Separation wall SP1 Divider SP2 Divider SP3 Divider ER Engine room EJ Ejector IC Intercooler M Muffler M1 Exhaust outlet end M2 Intake pipe M3 Between suction NS noise suppression means R1 inlet S1 cooling air passage S2 cooling air passages W bulkhead Wa front bulkhead Wfb front side partition wall Wrb rear side partition wall Wc rear bulkhead Wd bottom partition wall We upper partition

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) E02F 9/00 E02F 9/00 L F01P 5/02 F01P 5/02 F 5/06 510 5/06 510B 5 / 08 5/08 (72) Inventor Yoshiro Suzube 4-10-1, Yoga, Setagaya-ku, Tokyo New Caterpillar Mitsubishi Corporation (72) Inventor Shuichi Namizama 4-1-1, Yoga, Setagaya-ku, Tokyo Shinki Inside Yatapillar Mitsubishi Co., Ltd. (72) Inventor Yasutoshi Minamiyoshi 4-1-1, Yoga, Setagaya-ku, Tokyo New Kyatapillar Mitsubishi Co., Ltd. (72) Norio Nakajima 4-1-1, Yoga, Setagaya-ku, Tokyo New (72) Inventor Shigeru Kojima 4-10-1, Yoga, Setagaya-ku, Tokyo New Caterpillar Mitsubishi Corporation (72) Inventor Hide Izumi No. 4-10-1, Yoga, Setagaya-ku, Tokyo F-term in New Caterpillar Mitsubishi Co., Ltd. (Reference) 2D015 CA02 3D038 AA01 AA05 AA10 AB09 AC02 AC11 AC12 AC13 AC14 AC22 AC23 AC25 AC26

Claims (11)

[Claims] 1. A high-pressure hydraulic oil which is transmitted from a hydraulic pump driven by an engine mounted on a construction machine to a traveling device, a working device and the like of the construction machine and returns to the high-temperature hydraulic oil. A cooling machine for a construction machine, comprising: an oil cooler for cooling the engine; and a radiator for cooling the cooling water for the engine, comprising: an operator room disposed at one side of a front end in a front-rear direction of the construction machine; An engine horizontally disposed between a counter weight provided at a rear portion of the machine and the operator room, to which the hydraulic pump is connected, and cooling of the oil cooler and the radiator disposed in front of the engine One of the cooling units, a first cooling fan having driving means for cooling the one cooling unit, and a cooling fan disposed on the other side opposite to the one side. The other one of the coolers, a second cooling fan having driving means for cooling the other one of the coolers, and the operator room between the one of the coolers or the first cooling fan and the operator room. The fuel tank and the hydraulic oil tank disposed at the rear of the tank and the engine or the hydraulic pump and the other cooler are provided between the above-mentioned one of the tanks so as to be substantially parallel to the one of the above-mentioned tanks. A construction machine, comprising: the other one of the fuel tank and the hydraulic oil tank disposed along the engine; and an engine room configured by a partition wall surrounding the engine. Cooling system. 2. The engine room includes a rear partition provided between the hydraulic pump and the engine, a front partition provided between a front of the engine and a radiator or a first cooling fan, It is composed of a front side partition provided between each front side of the front partition and the rear partition, and a rear side partition provided between each rear side of the front partition and the rear partition. The cooling device for a construction machine according to claim 1, wherein: 3. A control valve for controlling the hydraulic oil, which is arranged substantially in a row between the one tank and the other tank and is arranged along the engine, the one tank and the other tank. The control valve and at least the two tanks and the front side partition of the engine room constitute an isolation wall serving as a cooling air passage of at least one of the two coolers. The cooling device for a construction machine according to claim 1 or 2, wherein 4. The cooling air passage formed between the front side partition wall and the isolation wall so as to diverge from a cooling air inlet side to a cooling air outlet side. The cooling device for a construction machine according to claim 3, which performs cooling. 5. The apparatus according to claim 1, wherein the one tank is disposed at a rear portion of the operator room provided on the one side, and an upper portion of the one tank is formed in a step shape. The cooling device for a construction machine according to any one of claims 1 to 3. 6. The partition wall, which is substantially continuous with a front partition wall of the engine room formed by at least the two tanks and the control valve, of the two tanks and the control valve. Claim 3
The cooling device for a construction machine according to any one of claims 1 to 5. 7. The driving means for driving the first and second cooling fans is configured to be driven by any one of a hydraulic motor, an electric motor, and the engine. The cooling device for a construction machine according to any one of Claims 4, 4, and 6. 8. The cooling device according to claim 1, wherein the cooling device is at least one of an intercooler for a supercharger, a radiator, and a cooling device for the oil cooler provided in the engine. Item 8. The cooling device for a construction machine according to any one of items 1, 2, 5, and 7. 9. A structure in which a contact area between a side surface of the hydraulic oil tank facing the other cooler or the second cooling fan and the cooling air is increased. The cooling device for a construction machine according to any one of Items 1 to 3, 4, 6, and 8. 10. The construction as claimed in claim 1, wherein the other cooling device or the second cooling fan is disposed on the other side of the construction machine in a forward direction. 1
Item 6. A cooling device for a construction machine according to item 1. 11. An exhaust outlet end of an exhaust pipe of an engine disposed in the engine room, and protruding longer than the exhaust outlet end at least with an interval from the exhaust outlet end, and An ejector comprising a suction pipe provided in a partition wall constituting the ejector, and configured to suck heated air in the engine room using the exhaust pressure of the engine and discharge the heated air to the outside, The cooling device for a construction machine according to any one of claims 1 to 3, 6, 9, and 10.