JP3511281B2 - Cooling equipment for construction machinery - Google Patents

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 hydraulic excavators, self-loaders, bulldozers, wheel loaders, crawler loaders, agricultural machines and the like (hereinafter simply referred to as construction machines).

[0002]

As is well known, construction machines such as hydraulic excavators, self-loaders, bulldozers, wheel loaders, and track loaders are used for excavating rocks such as dams, tunnels, rivers, and roads in mountains, buildings and buildings. It is used for tearing down, etc., the ambient temperature is extremely high under hot weather, and under the severe conditions of the scaffolding and ground surface at the work site, the output of the maximum capacity limit for the construction machine does not cause overload. As such, it is often forced to operate continuously.

The construction of the construction machine, for example, a hydraulic excavator is composed of an upper revolving structure 2, a lower traveling structure 4, and a working device 6. This hydraulic excavator will be described. The hydraulic excavator basic structure is composed of three parts, that is, a lower traveling body 4 provided below the upper revolving structure 2 which is configured to be rotatable as shown in FIGS. The upper revolving structure 2 includes an engine 8, a hydraulic device (not shown), a revolving device 12, an operator room 15, and the like. The lower traveling structure 4 includes a car body 16, a track roller frame 18, a traveling device 20, and others. The working device 6 is composed of a suspension device (not shown), and the working device 6 is composed of a boom 24 for supporting the bucket 22, an arm 25, various hydraulic cylinders for operating the boom, a link rod, and the like. The device 20 and the like are included.

The devices for operating the hydraulic excavator are the traveling device 20, the turning device 12, and the working device 6 described above.
The power of these devices is transmitted by converting the power of the engine 8 into hydraulic pressure by the hydraulic pump 26. Further, in the traveling device 20, the traveling motor is operated via the unillustrated swivel joint to transmit the traveling motor to the truck 28,
In the revolving device 12, a revolving motor (not shown) is operated and transmitted to the revolving gear, and in the working device 6, it is transmitted to various hydraulic cylinders and the like to perform the work of the hydraulic excavator.

Then, as shown in FIGS. 3 and 4, the hydraulic pump 26, the boom 24, the arm 25, and the traveling device 2 are used.
0, the swivel device 12, a control valve 70 for controlling the flow of hydraulic oil supplied to the working device 6 and the like, a pipe 73 for connecting the control valve 70 and the working device 6,
74 and a fuel tank 31 for supplying fuel to the engine 8
And a hydraulic oil tank 30 for storing the hydraulic oil sucked into the hydraulic pump 26, the hydraulic oil tank 30 and the hydraulic pump 2
6 and a delivery hose 78 that connects the hydraulic pump 26 and the control valve 70.
And an oil cooler pipe 75 connecting the control valve 70 and the oil tank 30, and a long oil cooler pipe 77 connecting the oil cooler 50 and the hydraulic oil tank 30.
And have.

As described above, for example, about 140 to 30 is discharged by the hydraulic pump 26 driven by the engine 8.
The hydraulic oil whose pressure has been increased to 0 kg / cm ² is controlled by various control valves 70 (not shown) and transmitted to the above-mentioned devices to become low-pressure oil.
It returns to the hydraulic oil tank 30 via 0 and is circulated again by the hydraulic pump 26.

Further, although the above construction machine has the self-propelled ability, in order to enhance the running ability, even if the discharge pressure changes due to the change of the load condition during running, the total horsepower of the engine is always converted into hydraulic horsepower. It can be done.
Therefore, as described above, the construction machine often operates continuously throughout the day in a limit region where the construction machine does not become overloaded.

Therefore, the working oil is discharged from the hydraulic pump 26, the above-mentioned work is carried out, and the temperature rises to about 90 to 100 ° C. when returning to the oil cooler 50 side. There is a possibility that the components of the hydraulic oil are destroyed by the high temperature and the hydraulic oil is deteriorated, the seal of the hydraulic equipment is broken, and the hydraulic equipment is damaged.

Therefore, the operation oil is returned to the front surface of the radiator 40 for the cooling water of the engine (hereinafter referred to as a radiator) 40 as shown in FIG. The oil is cooled by an oil cooler (hereinafter referred to as oil cooler) 50 for hydraulic oil provided, returned to the hydraulic oil tank, and circulated through the above path again.

[0010]

However, the oil cooler 50 is mounted on the front surface of the radiator 40 by the radiator 40.
The first cooling fan 52 is arranged so as to be superposed in series. For this reason, the cooling air that has passed through the oil cooler 50 and cooled the high-temperature hydraulic oil, which has become considerably high in temperature, cools the radiator 40 again, and therefore the cooling capacity for cooling water of the high-temperature engine that has cooled the engine 8. Has been reduced.

Further, as shown in FIG. 4, a counterweight is provided at the rear of the engine 8, and during maintenance, maintenance cannot be performed without climbing to the upper part of the construction machine. Since it is necessary to climb to the upper part of the machine body and the maintainability thereof is deteriorated and the oil cooler 50 and the hydraulic oil tank 30 are separated, the oil cooler pipe 77 between the oil cooler 50 and the hydraulic oil tank 30 is long. The pressure loss is large and the piping is troublesome.

The present invention was devised in view of these problems. An engine mounted on a construction machine is vertically arranged, and an oil cooler for hydraulic oil of the construction machine and a cooling of the oil cooler are provided. The fan and the engine are separated and independent of each other, and the fan is disposed in the rear of the construction machine substantially in the center along the vehicle width direction, and the hydraulic oil tank is provided near the cooling fan so as to face the cooling fan of the oil cooler. An object of the present invention is to provide a cooling device for a construction machine in which the above is provided.

[0013]

Therefore, in the cooling device for a construction machine according to the present invention, the high-pressure hydraulic oil from the hydraulic pump driven by the engine mounted on the construction machine is used for the construction machine. In the cooling device for the construction machine, which is provided with an oil cooler for cooling the high-temperature working oil that has returned to the traveling device, the working device, etc. and has returned to the high temperature, and a radiator for cooling the cooling water of the engine, An operator room is provided on one side of the front end of the construction machine in the front-rear direction, and the engine with the hydraulic pump connected to the other side opposite to the one side is installed vertically, and the front side of the engine is provided. Any one of the cooling machines such as the oil cooler and the radiator described above, a first cooling fan that cools the one cooling machine, and a drive unit that drives the first cooling fan are provided. A second cooling fan for cooling the other cooling machine of the cooling machine and a second cooling fan for cooling the other cooling machine in a space formed by the peter chamber, the other side part, and a counterweight provided at the rear part of the construction machine. and drive means for driving the cooling fan is provided, provided the configured working oil tank so that the area of the outer wall surface opposed to the second cooling fan provided in the vicinity of the second cooling fan is increased, the upper
A control valve connected to the hydraulic oil tank 30.
The valve 70 moves from the other cooler 50 to the hydraulic oil tank 3
Front side of the above-mentioned construction machine in the front-rear direction of the cooling air passage leading to 0
It is characterized by being arranged in .

A cooling device for a construction machine according to a second aspect of the present invention is the cooling device for a construction machine according to the first aspect, provided between the rear portion of the operator room and the counterweight along a side portion of the construction machine. The engine includes a fuel tank, the other cooler and the other cooler along the counter weight in a space formed between the other side portion, the counter weight, the fuel tank, and the operator room. A second cooling fan for cooling the second cooling fan and a driving means for driving the second cooling fan, and are arranged before and after the second cooling fan or the other cooling machine. cooling air from flowing configured to allowed to increase the area of the outer wall surface of the side, front of the construction machine
The hydraulic oil tank is provided on the front side of the counterweight in the rear direction .

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 other cooling device is provided in the engine for a supercharger intercooler, the radiator, and the oil. It is characterized in that it is at least one of the coolers of the cooler. A cooling device for a construction machine according to a fourth aspect of the present invention has the configuration according to any one of the first to third aspects,
The operator compartment is provided at the front end portion of the one side, the engine room to retract and the upright position the engine in which the hydraulic pump on the other side of the opposite side connected to said one side is provided Is characterized by.

A cooling device for a construction machine according to a fifth aspect of the present invention is the cooling device for a construction machine according to any one of the first to fourth aspects,
The drive means for driving the first and second cooling fans is characterized by being driven by a hydraulic motor, an electric motor, the engine, or the like. Claim
According to a sixth aspect of the present invention, there is provided a cooling device for a construction machine according to the fourth aspect.
5. The engine room according to claim 5 , wherein the exhaust outlet end portion of the exhaust pipe of the engine disposed in the engine room is spaced apart from at least the exhaust outlet end portion and protrudes longer than the exhaust outlet end portion. It is characterized in that it comprises an ejector consisting of a suction pipe provided in the partition wall, and is configured to suck the heated air in the engine room using the exhaust pressure of the engine and discharge it to the outside. .

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. A case in which a cooling device for a construction machine according to the present invention is applied to a hydraulic excavator will be described with reference to FIGS. The parts that are substantially the same as those of the conventional hydraulic excavator shown in FIGS. 3 and 4 are designated by the same reference numerals.

FIG. 1 shows an embodiment of the present invention.
FIG. 2 is a schematic plan view showing a state similar to that of FIG. 4, and FIG. 2 is a schematic enlarged explanatory view showing a modified example of the embodiment of FIG. In the hydraulic excavator, the upper traveling body 2 is rotatably mounted on the lower traveling body 4 similarly to the hydraulic excavator described in the conventional example, and the engine 8 and the hydraulic pump 26 driven by the engine 8 are provided. It is configured to be operated by the hydraulic pressure from the hydraulic pump 26.

As shown in FIG. 1, an operator room 15 is provided at one side 1a of the front end of the construction machine in the front-rear direction, and a radiator 40 is provided at the other side 1b opposite to the one side 1a. A first cooling fan 52 having a driving means 51 for cooling the radiator 40, the engine 8 and the hydraulic pump 26 are arranged along the front-rear direction of the construction machine, and the operator room 15, the other side portion 1b and the above In the space S formed by the counterweight 27 provided at the rear of the construction machine, in the present embodiment, the oil cooler 50 that cools the working hydraulic pressure and the second cooling fan 53 that cools the oil cooler 50 are provided on the front side of the counterweight 27. And the second cooling fan 5
Drive means 51 for driving the third cooling fan 5
A hydraulic oil tank 30 is provided in the vicinity of the second cooling fan 53 so as to face No. 3.

Further, a control valve 70 for controlling the flow of hydraulic oil supplied from the hydraulic pump 26 to the traveling device 20, the turning device 12, the working device 6 and the like, and a pipe connecting the control valve 70 and the working device 6 73,74
A fuel tank 31 for supplying fuel to the engine 8, a hydraulic oil tank 30 for storing the hydraulic oil sucked into the hydraulic pump 26, and a supply pipe 76 for connecting the hydraulic oil tank 30 and the hydraulic pump 26. , A delivery hose 78 that connects the hydraulic pump 26 and the control valve 70, an oil cooler pipe 75 that connects the control valve 70 and the oil cooler 50, and a short oil cooler pipe that connects the oil cooler 50 and the hydraulic oil tank 30. 77 and.

Further, a fuel tank 31 for the engine 8 is provided between the rear of the operator room 15 and the counterweight 27 along the side of the side 1a of the construction machine.
Then, the engine 8 and the hydraulic pump 2 of the construction machine described above.
An oil cooler 50 along the counter weight 27 in a space S formed by the other side portion 1b where the 6 is arranged, the counter weight 27, the fuel tank 31, and the operator chamber 15, and a drive for cooling the oil cooler 50. Means 51
The second cooling fan 53 having the above and the hydraulic oil tank 30 are arranged, and the control valve 70 is arranged in front of the hydraulic oil tank 30.

Further, the hydraulic oil tank 30 is provided near the rear of the second cooling fan 53, and the hydraulic oil tank 30 is positively cooled by the cooling air that has cooled the oil cooler 50. In addition, the shape is such that the area on the side facing the cooling air increases. Also, the second
Since the cooling fan 53 and the control valve 70 are arranged in the space S, noise generated during the operation of the second cooling fan 53 and the control valve 70 is generated by the engine 8, the hydraulic pump 26, the counter weight 27, and the fuel tank 31. Since they are surrounded by and, they become noise barriers and noise is reduced.

Further, as shown by the chain double-dashed line in FIG. 1, the hydraulic oil tank 30 is arranged before and after the second cooling fan 53,
At least the outer wall surface 3 on the side facing the second cooling fan 53
If it is configured to increase the area of 0a, the cooling air from the second cooling fan 53 flows, and the above function and effect can be further improved. Since the present invention is configured as described above, the construction machine performs the above work as shown in FIG. 1, and the temperature becomes high (about 90 to 100 ° C.) from the control valve 70 via the oil cooler pipe 75. Operating oil enters the oil cooler 50, and the second cooling fan 53
Is cooled by.

The cooling air from the second cooling fan 53 cools the high-temperature hydraulic oil, and then the hydraulic oil tank 3
0, the control valve 70 is cooled and discharged into the atmosphere. On the other hand, the cooling air introduced from the front side of the construction machine by the first cooling fan 52 provided on the other side portion 1b of the construction machine cools the engine 8 with the radiator 40 and then cools the engine 8. And is discharged to the outside from at least one of the discharge ports 46 provided on the side 46a, the upper rear 46b, and the rear 46c of the through hole P penetrating the counterweight 27 in the front-rear direction of the construction machine. It is something.

In this case, since the oil cooler 50 and the radiator 40 are not arranged in series as in the case of the conventional example shown in FIG. 4, the temperature of the cooling air does not rise in the oil cooler 50 and the construction machine Since the radiator 40 is cooled at a low temperature when it is introduced from the front, the radiator 40 can be cooled efficiently. Further, the shape of the hydraulic oil tank 30 is, as shown by the two-dot chain line in FIG. 1, the shape of the outer wall surface 30a thereof is a parabolic cube, or a cube (not shown) such as a triangular prism, a spherical body, an ellipsoidal sphere, or the like. It suffices that it has a shape capable of increasing the contact area of the cooling air from the second cooling fan 53, preferably a paraboloidal shape, which can improve the effective cooling performance.

In the above embodiment, the cooler installed in the space S separately from the engine 8 is the oil cooler 50. However, the cooler is not limited to this, and the radiator 40 or the necessary one is not limited thereto. Even with an intercooler for a supercharger provided in accordance with the above, the hydraulic oil tank 30 arranged in the space S can be cooled, and substantially the same operational effect as the above-described embodiment can be obtained.

Therefore, according to the present invention, the engine cooling performance is improved as described above, and the noise can be reduced by lowering the number of rotations of the cooling fan.
Can be made smaller and the cost can be reduced. Further, the oil cooler piping can be shortened, the pressure loss is small, and the piping can be easily performed.

In the above-described embodiment, the case where there is no partition wall between the engine 8 and the hydraulic pump 26 has been described.
As shown by the chain double-dashed line in FIG.
In some cases, a firewall FW may be provided between the engine 8 and the engine, and the cooling air of the engine 8 may not always actively cool both the engine 8 and the hydraulic pump 26. In this case, the cooling air taken in from the front side of the construction machine and cooling the radiator 40 is discharged to the outside of the machine from at least one of the side 45a and the upper rear side 45b as shown in FIG. Since the cooling air of the first cooling fan 52 and the cooling air of the second cooling fan 53 respectively flow through independent cooling air passages,
The cooling efficiency can be improved.

Next, a modified example of the above-described embodiment will be described with reference to FIG. 2. The substantially same parts as those of the above-mentioned embodiment will be described with the same reference numerals. The operator room 1 is provided on one side portion 1a in the left-right direction of the front end portion in the front-rear direction of the construction machine.
5 is provided, and an engine room ER for vertically storing the engine 8 to which the hydraulic pump 26 is connected as shown in FIG. 2 is provided on the other side portion 1b opposite to the one side portion 1a. The noise generated from the first cooling fan 52, the driving unit 51 that drives the first cooling fan 52, the hydraulic pump 26, and the like can be blocked from being transmitted to the outside.

Further, the engine room ER may be a mere partition wall for partitioning the engine 8 from other various hydraulic equipment or the like, and an enclosure provided so as to surround the engine 8 for cutting off the noise of the engine 8. Or a firewall that isolates the hydraulic pump 26 from the engine 8 and surrounds the periphery of the engine 8.

Further, in the above enclosure, for example, the front partition wall Wa, the side partition wall Wb, the rear partition wall Wc, and the bottom portion of the engine 8 or the periphery of the engine 8 and the oil pump 26, as shown in FIGS. The barrier ribs Wd, the upper barrier ribs We, and the like are configured to be at least substantially surrounded by the barrier ribs W. As shown in FIG. 2, the turbocharger 102 is provided on the upper portion of the engine 8 and is connected from the outlet 127a to the intercooler 50 through the pipe 104. The supercharged fluid cooled by the intercooler 50 is introduced through the inlet 127b. The engine 8 is configured to be supercharged.

Furthermore, in addition to the above, in the exhaust system of the engine 8 as shown in FIG.
The muffler M is disposed in the engine room ER by using the engine exhaust pressure discharged to the outside in a part of the upper partition wall We of the engine room ER in which the outlet of the muffler M is disposed.
If an ejector EJ including an outer pipe and an inner pipe that sucks the heated air inside and discharges it to the outside is provided, the engine room ER,
It is also possible to more effectively cool the engine 8, the hydraulic pump 26, etc., and improve the cooling efficiency.

The ejector EJ has the exhaust outlet end M1 of the exhaust pipe 8a extending from the muffler M as an inner pipe protruding from the muffler M, and the exhaust outlet end M1.
Of the suction pipe M2 as an outer pipe protruding from the engine room ER with a space around the exhaust gas and longer than the exhaust outlet end M1.
And a suction gap M3 formed between the exhaust outlet end M1 and the suction pipe M2 for sucking air in the engine room ER.

If necessary, a large number of slit-like intake ports R1 are provided in the bottom partition wall Wd of the engine room ER, which is located on the opposite side of the ejector EJ via the air passage EY in the engine room. If the ventilation in the ER is promoted, the cooling efficiency can be improved. Each of the above-mentioned intake ports R1 is equipped with a looper R as noise suppression means NS for suppressing leakage of engine noise to the outside of the engine room ER, and these loopers R are formed by cutting and raising from each air port R1. ing.

Further, although not shown, the noise suppressing means NS has a sound absorbing effect at the intake port R1 formed in a box shape, for example, and engine noise and 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 arranged in the engine 8, and the suction gap M3 is also negative pressure. The air in the room ER can be sucked together with heat and forcedly discharged to the outside.

Further, when the ejector EJ is provided, the first cooling fan 52 can be omitted when the ejector EJ alone is sufficient for cooling, and the cost can be reduced.

[0037]

As described in detail above, according to the cooling apparatus for a construction machine 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 returned to the traveling device and the working device of the construction machine and returns; and a radiator that cools the cooling water of the engine. , An operator room is provided on one side of the front end of the construction machine in the front-rear direction, and the engine to which the hydraulic pump is connected is provided vertically on the other side opposite to the one side. The front side is provided with any one of the cooling machines such as the oil cooler and the radiator, a first cooling fan for cooling the one cooling machine, and a driving means for driving the first cooling fan. A second cooling fan for cooling the other cooling machine of the cooling machine and a second cooling fan for cooling the other cooling machine in a space formed by an operator room, the other side part, and a counterweight provided at a rear part of the construction machine. and drive means for driving the cooling fan is provided, provided the configured working oil tank so that the area of the outer wall surface opposed to the second cooling fan provided in the vicinity of the second cooling fan is increased, the upper
A control valve connected to the hydraulic oil tank 30.
The valve 70 moves from the other cooler 50 to the hydraulic oil tank 3
Front side of the above-mentioned construction machine in the front-rear direction of the cooling air passage leading to 0
Than is disposed above the hydraulic oil, to improve cooling performance of the cooling water and engine by lowering the rotational speed of both the cooling fan can reduce noise, if the equivalent noise the oil cooler and The radiator can be downsized and the cost can be reduced.

Further, the oil cooler pipe can be shortened, the pressure loss is small, and the pipe can be easily installed. Claim 2
According to the cooling device for a construction machine of the present invention described in claim 1,
In the configuration described above, the engine fuel tank is provided along the side portion of the construction machine between the operator room rear portion and the counter weight, and the other side portion, the counter weight, and the fuel tank are provided. A second cooling device for cooling the other cooling device and the other cooling device along the counter weight in a space formed between the second cooling device and the operator room.
A cooling fan and driving means for driving the second cooling fan are provided, and cooling air from the second cooling fan or the other cooling machine is disposed before and after the second cooling fan or the other cooling machine. It is configured to allowed to increase the area of the outer wall surface of the side flow, the longitudinal direction of the counter of the construction machine
Since the hydraulic oil tank is provided on the front side of the weight, the fuel tank also serves as a soundproof wall between the operator room rear of the construction machine and the counterweight, and the counterweight, the fuel tank, the operator room and others. A space constituted by the side portion can be a soundproof space, and the noise is reduced by providing the other cooler, the second cooling fan, and a driving means for the second cooling fan, which are noise sources, in the soundproof space. be able to.

[0039] Also, with the space becomes soundproof space to reduce the leakage of the rotation noise of the other cooler and the second cooling fan, and the hydraulic oil tank is cooled by the cooling air of the second cooling fan, the control Since the high-temperature atmospheric fluid near the valve can be positively discharged, the hydraulic oil can be effectively cooled.

According to a third aspect of the cooling apparatus for a construction machine of the present invention, in the configuration according to the first or second aspect , the other cooling machine is an intercooler for a supercharger arranged in the engine, Since at least one of the radiator and the cooler for the oil cooler is a cooler, it is possible to efficiently cool the oil cooler, the radiator, and the intercooler to improve the cooling performance. Can be small,
Since the rotation speed of the cooling fan of the cooling machine can be reduced, noise generation can be reduced.

[0041] According to the cooling system for a construction machine of the present invention described in claim 4, in the structure according to any one of claims 1 to 3, the operator chamber is provided in the front end of the one side, On the other side of the side opposite to the one side, there is provided an engine room in which the engine connected to the hydraulic pump is installed vertically. Therefore, the engine room uses the first cooling fan, The noise generated from the engine, hydraulic pump, etc. can be cut off to reduce leakage to the outside.

According to a fifth aspect of the cooling apparatus for a construction machine of the present invention, in the constitution according to any one of the first to fourth aspects, the driving means for driving the first and second cooling fans is Since it is configured to be driven by a hydraulic motor, an electric motor, the engine, etc., it is possible to improve the cooling performance of each by controlling the other cooler separately from the one cooler. .

According to a sixth aspect of the cooling apparatus for a construction machine of the present invention, in the configuration according to the fourth or fifth aspect , at least the exhaust outlet end portion of the exhaust pipe of the engine disposed in the engine room, The engine is provided with an ejector that is spaced apart from the exhaust outlet end and protrudes longer than the exhaust outlet end and that is composed of a suction pipe provided in a partition wall that constitutes the engine room, and that uses the exhaust pressure of the engine. Since the heated air in the room is sucked and discharged to the outside, each part in the engine room can be effectively cooled.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention and is a schematic plan view showing a state similar to that of FIG.

2 is a schematic enlarged explanatory view showing a modified example of the embodiment of FIG. 1 and showing an arrow A in FIG. 1. FIG.

FIG. 3 is a schematic perspective view showing a conventional hydraulic excavator.

FIG. 4 is a schematic explanatory view showing a plan view of FIG.

[Explanation of symbols]

1a One side of construction machinery 1b Other side of construction machine 2 Upper revolving structure 4 Undercarriage 6 Working device 8 engine 12 swivel device 15 Operator room 16 car body 18 track roller frame 20 traveling device 22 buckets 24 boom 26 hydraulic pump 30 hydraulic oil tank 30a External wall of hydraulic oil tank 31 Fuel tank 33 storage boxes 40 radiator 50 oil cooler 51 drive means 52 First cooling fan 53 Second cooling fan 70 Control valve S space ER engine room FW firewall M muffler M1 exhaust outlet end M2 suction tube M3 suction gap

Continued front page    (72) Inventor Mitsuru Hikiyama               New 4-10 Yoga, Setagaya-ku, Tokyo               Caterpillar Mitsubishi Corporation (72) Inventor Hideyuki Izumi               New 4-10 Yoga, Setagaya-ku, Tokyo               Caterpillar Mitsubishi Corporation (72) Inventor Norio Nakajima               New 4-10 Yoga, Setagaya-ku, Tokyo               Caterpillar Mitsubishi Corporation (72) Inventor Yasutoshi Nankichi               New 4-10 Yoga, Setagaya-ku, Tokyo               Caterpillar Mitsubishi Corporation (72) Inventor Shoji Murakami               New 4-10 Yoga, Setagaya-ku, Tokyo               Caterpillar Mitsubishi Corporation (72) Inventor, Shuichi Namiza               New 4-10 Yoga, Setagaya-ku, Tokyo               Caterpillar Mitsubishi Corporation (72) Inventor Masaaki Takeuchi               Kobe City Hyogo-ku Wadamiya 7-chome 14-1               Within Nishiryo Engineering Co., Ltd.                (56) Reference JP-A-8-277713 (JP, A)                 JP-A-9-125957 (JP, A)                 Actual development Sho 64-41620 (JP, U)                 57-133450 (JP, U)

Claims (6)

(57) [Claims] 1. A high-temperature hydraulic oil that returns to a high temperature by transmitting high-pressure hydraulic oil from a hydraulic pump driven by an engine mounted on the construction machine to a traveling device, a working device, etc. of the construction machine. In a cooling device for a construction machine comprising an oil cooler for cooling the engine and a radiator for cooling the cooling water for the engine, an operator room is provided at one side of a front end of the construction machine in the front-rear direction, and the one side is provided. The engine having the hydraulic pump connected to the other side opposite to the above is installed vertically, and one of the coolers such as the oil cooler and the radiator and the other one of the coolers such as the oil cooler and the radiator are provided on the front side of the engine. A counterway provided in the operator room, the other side portion, and the rear portion of the construction machine, the first cooling fan for cooling the cooling machine and the driving means for driving the first cooling fan being provided. A second cooling device of the cooling device and a second cooling device of the other cooling device in a space formed by
A cooling fan and driving means for driving the second cooling fan are provided, and the second cooling fan is provided in the vicinity of the second cooling fan.
A hydraulic oil tank configured to increase the area of the outer wall surface facing the cooling fan is provided .
The control valve 70 connected to the other control valve
Cooling air passage from the waste machine 50 to the hydraulic oil tank 30
The cooling device for a construction machine, wherein the cooling device is arranged on the front side in the front-rear direction of the construction machine. 2. A fuel tank for the engine, which is provided along a side portion of the construction machine between the rear portion of the operator room and the counter weight, the other side portion, the counter weight, and the fuel tank. In the space formed between the operator room and the counter weight, the other cooling machine, a second cooling fan for cooling the other cooling machine, and a driving means for driving the second cooling fan are provided. is configured to allowed to increase the area of the outer wall surface of the side where the cooling air flows from the second cooling fan or the disposed before and after the other of the cooler the second cooling fan or the other of the cooler, the Front and back counterweight of construction machinery
The cooling device for a construction machine according to claim 1, wherein the hydraulic oil tank is provided on the front side of the wheel . 3. The other cooler is at least one cooler of a supercharger intercooler provided in the engine, the radiator, and the oil cooler. Item 1. A cooling device for a construction machine according to item 1 or 2. 4. An operator room is provided at a front end portion of the one side portion, and an engine room for vertically storing the engine having the hydraulic pump connected to the other side portion opposite to the one side portion is provided. It is characterized by being provided.
The cooling device for a construction machine according to any one of 3 above. 5. The driving means for driving the first and second cooling fans is configured to be driven by a hydraulic motor, an electric motor, the engine or the like. A cooling device for a construction machine according to any one of 1. 6. The exhaust outlet end of an exhaust pipe of an engine disposed in the engine room, and a portion which is spaced apart from at least the exhaust outlet end and protrudes longer than the exhaust outlet end, and the engine room It comprises an ejector consisting of a suction pipe provided in the partition wall, which is configured to suck the heated air in the engine room using the exhaust pressure of the engine to be discharged to the outside, The cooling device for a construction machine according to claim 4 or 5.