JPH11241367A - Cooling device for construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve cooling effect of an engine, a refrigerating machine, etc., by disposing an intercooler for a supercharger and a first cooling fan to cool the intercooler on the side of a construction machine driving engine in a cooling device for a construction machine, and disposing a retrigerating machine comprising a working fluid oil cooler, a cooling water radiator, etc., for the construction machine independent separately from the engine. SOLUTION: An intercooler IC for a supercharger and a first cooling fan 52 to cool the intercooler IC are disposed on the side of an engine 8 mounted on a constrain machine. A refrigerating machine comporising a working fluid oil cooler 50, a cooling water radiator 40, etc., for the construction machine, and a second cooling fan 53 to cool this refrierating machine are disposed independently separately from the engine 8.

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 and a crawler type loader, an agricultural machine and the like (hereinafter simply referred to as a construction machine).

[0002]

2. Description of the Related Art As is well known, construction machines such as hydraulic excavators, bulldozers, wheel loaders, and track-type loaders excavate rocks and destroy buildings and buildings in mountainous dams, tunnels, rivers, and roads. In extreme conditions where the temperature of the atmosphere is very high under the scorching sun and the scaffolding and ground surface of the work site are poor, the construction machine is not overloaded with the maximum capacity limit output. In addition, continuous operation is often required.

The structure of the construction machine is, for example, a hydraulic excavator. The basic structure of the hydraulic excavator is, as shown in FIGS. 3 and 4, an upper part which supports the upper revolving unit 2 and the upper revolving unit 2 so as to be revolvable. It is composed of three parts, a lower traveling body 4 provided below the revolving superstructure 2 and a working device 6 provided on the upper revolving superstructure 2 for performing various operations. The upper revolving unit 2 includes an engine 8, a hydraulic device (not shown),
The lower traveling unit 4 is composed of a car body 16, a track roller frame 18, a traveling unit 20, and other suspension devices (not shown). The working unit 6 is a bucket. 22
And a boom 24 and an arm 25 for supporting the same, and various hydraulic cylinders, link rods, and the like for operating the arm.

Then, the above-mentioned working device 6, traveling device 2
0, a hydraulic device for operating an actuator such as the turning device 12 is provided. As shown in FIGS. 3 and 4, the upper swing body 2 of the conventional hydraulic shovel has an engine 8 as a prime mover, a hydraulic pump 26 driven by the engine 8, and a discharge from the hydraulic pump 26. For example, a boom cylinder 24a for rotating the boom 24 as shown in FIG. 3 or 4 and a hydraulic oil supplied from a hydraulic pump 26 to an actuator such as the boom cylinder 24a. A control valve 70 for controlling the flow, hydraulic pipes 73 and 74 connecting the control valve 70 to the boom cylinder 24a, and a hydraulic pipe 73 connecting the control valve 70 to another actuator (not shown).
a, 74a, a fuel tank 31 for supplying fuel to the engine 8, a hydraulic oil tank 30 for storing hydraulic oil supplied to the hydraulic pump 26, and a hydraulic pipe connecting the hydraulic oil tank 30 and the hydraulic pump 26. And delivery hose 7 connecting hydraulic pump 26 and control valve 70
8, a pipe 75 connecting the control valve 70 and the oil cooler 50, a long pipe 77 connecting the oil cooler 50 and the hydraulic oil tank 30, and a storage box 33 and the operator room 15. ing.

[0005] The hydraulic oil driven by the engine 8 and discharged by the hydraulic pump 26, which is appropriately determined by, for example, design specifications, is pressurized to about 140 to 300 kg / cm ^2, and is controlled by a control valve 70. It is transmitted to each of the above devices and performs various operations to become low-pressure oil.
It returns to the hydraulic oil tank 30 again via the control valve 70 and is circulated again by the hydraulic pump 26.

[0006] As shown in FIG. 4, the turbocharger 102 provided above the engine 8 is connected to an intercooler IC via an air pipe (not shown). Engine 8
Connected to the intake manifold. The construction machine is controlled so that the hydraulic pump 26 can output the maximum capacity in accordance with the operation of the operator during operation, and the construction machine operates continuously throughout the day in a limit area where the overload does not occur. Often.

Therefore, while the circulation of the hydraulic oil is discharged from the hydraulic pump 26 and returns to the oil cooler 50 side, the heat generated by the pressure loss in the hydraulic circuit and the pressure oil from the relief valve are discharged. The oil temperature continues to rise little by little due to heat generated at the time of escape, heat generated by sliding friction of each actuator, and the like. As a result, when the operation of the construction machine is continued as it is, the temperature of the hydraulic oil finally rises to the maximum usable temperature of the hydraulic oil of the construction machine.

The maximum usable temperature of the hydraulic oil differs depending on the size and design specifications of the construction machine, the type of the hydraulic oil used, and the like. If the temperature is higher than that, there is a possibility that deterioration of a seal or the like (not shown) or deterioration of lubricating oil performance may cause seizure of a rotating part. Therefore, the hydraulic oil returned after performing the operation as described above is disposed so as to be superimposed on the front surface of a cooling water radiator (hereinafter, referred to as a radiator) 40 of the engine as shown in FIG. The oil is cooled by an oil cooler for hydraulic oil (hereinafter referred to as an oil cooler) 50, returned to the hydraulic oil tank, and circulated through the above-described path again.

The engine 8 is disposed horizontally with respect to the front-rear direction of the upper revolving unit 2, and the cooling device of the hydraulic shovel is provided with a cooling device mounted in front of the engine 8 as shown in FIG. An intercooler IC for a supercharger of the engine 8, an oil cooler 50, and a radiator 40 are arranged in series in front of the fan 52, but the above intercooler IC is usually arranged at the most windward side of the cooling air. Have been.

By the way, in the case of the above-mentioned hydraulic excavator,
As the output of the engine 8 increases, the size of the heat exchanger such as the radiator 40 also increases, and the power consumption of the cooling fan 52 required for cooling the heat exchanger also increases. And
As shown in FIG. 4, the intercooler IC and the oil cooler 5
0 and the radiator 40 are arranged in series,
Since the flow resistance of the cooling air increases, the horsepower consumption of the cooling fan 52 required for cooling further increases.

[0011] Further, another conventional example of actual open flat 4─134
In the technology described in Japanese Patent Publication No. 565, although not shown, the engine is disposed horizontally in an engine room of an upper revolving structure, an oil cooler and a radiator are separately arranged, and the oil cooler is cooled by an oil cooler cooling fan. The radiator is cooled by an engine fan provided in the engine, so that clogging of the radiator can be easily cleaned.

Another conventional example is disclosed in Japanese Unexamined Patent Publication No.
In the technology described in Japanese Patent Application Publication No. 72, although not shown, the engine is disposed horizontally in an engine room of an upper revolving structure, and an oil cooler that cools hydraulic oil by a fan driven by the engine and cools engine cooling water. A cooling device for a hydraulic shovel having a radiator and an intercooler for cooling air supplied by a turbocharger, wherein the oil cooler and the radiator are disposed in front of a cooling fan of the engine in an engine room for storing the engine. And the intercooler is separately disposed outside the engine room.By eliminating the intercooler disposed in the engine room, the oil cooler and the radiator core front surface are disposed. The heat radiation area is smaller than before, making it easier to manufacture heat exchangers and reducing costs. A.

[0013]

However, in the conventional cooling device as shown in FIG.
C is located on the windward side, so the intercooler IC
Since the temperature of the cooling air that has been cooled in step (1) rises, the cooling capacity for other heat exchangers such as the radiator and the oil cooler decreases.

[0014] Therefore, it is necessary to use a heat exchanger having a large cooling capacity. However, the size of the heat exchanger is required to unnecessarily increase the core area of the oil cooler and the radiator due to a problem such as an arrangement space. And there is a production limit. Also, if a large heat exchanger is used, the core may be cracked due to the vibration of the airframe.

Therefore, especially when manufacturing a large-sized hydraulic excavator, it is necessary to prevent the temperature of the cooling water or the working oil of the engine from being overheated and to reduce the size of the heat exchanger. Particularly, in the case of a large-sized hydraulic excavator, the upper revolving unit becomes large in order to mount a large engine or the like. In addition, the engine is placed horizontally or vertically on the upper revolving unit, and an intercooler, an oil cooler, Since the radiators are arranged in series, as shown in FIG. 4, when the engine 8 is placed in a horizontal position, the width w of the upper revolving unit increases and exceeds the lateral width limit at the time of transporting the vehicle. When the engine 8 is placed vertically with respect to the front-rear direction of the upper revolving unit 2, the length in the front-rear direction becomes longer. Becomes large and the range of action is restricted.

The prior art disclosed in Japanese Patent Application Laid-Open No. 9-125972 discloses the radiator and oil provided on the front side of a cooling fan directly connected to the front of an engine provided in the engine room. Since the high-temperature cooling air that has cooled the cooler is further cooled to cool the engine and the oil pump and is discharged outside the machine, the cooling efficiency for the engine and the oil pump is reduced, and the inside of the oil pump is reduced. There is a possibility that cooling of the hydraulic oil may not be performed efficiently.

Further, since the cooling air that has cooled the radiator and the oil cooler is a considerably high-temperature fluid, in order to cool the engine and the oil pump efficiently,
The clearance between the engine or the oil pump and the inner wall of the engine room should be greater than a predetermined value, the flow resistance of the cooling air should be reduced as much as possible, and the storage volume of the engine room should be large in order to enable smooth flow. Therefore, the entire excavator becomes large in size, and the above-mentioned restrictions on transportation of the excavator and an increase in the rear end turning radius of the upper swing body 2 restrict the range of action.

The present invention has been made in view of these problems, and has an intercooler for a supercharger of an engine mounted on an engine mounted on a construction machine. A cooling device for a construction machine, wherein a cooling device such as a cooler, a radiator for cooling water, and a cooling fan for cooling the cooling device are separately provided from the engine, and the cooling effect of the engine, the cooling device, and the like is improved. The purpose is to provide.

[0019]

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. An oil cooler that cools the high-temperature working oil that is returned to the traveling device, working device, etc. and returns, a radiator that cools the cooling water of the engine, and an air supply by a supercharger of the engine. A cooling device for a construction machine having an intercooler for cooling, wherein the intercooler is disposed in front of, behind, or above the engine, and a first cooling fan for cooling the intercooler and a driving means for the first cooling fan are provided. And the oil cooler and the radiator are separately disposed from the engine and the intercooler, and the oil cooler and the radiator are Second cooling fan for cooling and the second
A cooling fan driving means is provided.

According to a second aspect of the present invention, there is provided a cooling device for a construction machine according to the present invention, which transmits high-pressure hydraulic oil from a hydraulic pump driven by an engine mounted on the construction machine to a traveling device, a working device, and the like of the construction machine. A construction including an oil cooler that cools the returning hot oil, a radiator that cools the cooling water of the engine, and an intercooler that cools the supply air of the turbocharger of the engine. In a cooling device for a machine, a first cooling fan for arranging the intercooler in front of, behind, or above the engine housed in an engine room of the engine and for cooling the intercooler, and driving means for the first cooling fan The oil cooler and the radiator are separately arranged outside the engine room, and the oil cooler and the radiator are separately arranged. Is characterized in that the drive means of the second cooling fan and said second cooling fan for cooling were provided with Jieta.

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 first cooling fan of the intercooler and the second cooling fan of the oil cooler and the radiator are driven. Are driven by a hydraulic motor, an electric motor, or the engine, respectively. 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 a hydraulic motor connected to the first cooling fan is driven by a hydraulic pump with an operating hydraulic pressure. In an electric circuit for driving an electric motor connected to the cooling fan, a control means for controlling the number of rotations of the hydraulic motor or the electric motor is provided, and an ambient temperature sensor for detecting an ambient temperature in the engine room; It has at least one of a supercharged air temperature sensor for detecting a supercharged air temperature of the intercooler, and connects the temperature sensor and the control means via a controller to detect the temperature sensor. The rotation speed of the hydraulic motor or the electric motor is controlled by a command signal from the controller corresponding to the temperature. .

According to a fifth aspect of the present invention, there is provided a cooling device for a construction machine according to the third aspect of the present invention.
The rotation of the hydraulic motor or the electric motor in a hydraulic circuit for driving the hydraulic motor connected to the cooling fan from the hydraulic pump by operating hydraulic pressure or in an electric circuit for driving the electric motor connected to the second cooling fan. Control means for controlling the temperature of the oil cooler, a hydraulic oil temperature sensor for detecting the temperature of the hydraulic oil of the oil cooler, a cooling water temperature sensor for detecting the temperature of the cooling water of the radiator, and the cooling after passing through the oil cooler and the radiator. It has at least one temperature sensor of a cooling air temperature sensor that detects the temperature of air, connects the temperature sensor and the control means via a controller, and corresponds to the temperature detected by the temperature sensor. The rotation speed of the hydraulic motor or the electric motor is controlled by a command signal from a controller.

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 first, second, and fifth aspects, wherein an exhaust outlet end of an exhaust pipe of an engine disposed in the engine room. Part, and an ejector comprising a suction pipe provided at a partition wall constituting an engine room while projecting longer than the exhaust outlet end at least with an interval from the exhaust outlet end, and using an exhaust pressure of the engine. Thus, the heating air in the engine room is sucked and discharged to the outside.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIGS. 1 and 2 show an embodiment of the present invention. A case in which the present invention is applied to a shovel will be described. The same reference numerals are given to substantially the same parts as those of the above-described conventional hydraulic shovel. FIG. 1 shows an embodiment of the present invention.
FIG. 2 is a schematic plan view showing the same state as FIG. 4, and FIG.

As shown in FIG. 1, the hydraulic shovel may be installed vertically along the front and rear direction of the upper swing body 2 or may be horizontally installed along the vehicle width direction of the upper swing body 2. An engine room ER for accommodating the mounted engine 8 is provided. In the case of the present embodiment, a counterweight 27 is provided.
The engine 8 in the engine room ER provided along
Are arranged horizontally.

The engine room ER may be a simple partition wall Db that separates the engine 8 from various other hydraulic devices and the like, and is provided so as to surround the left, right, front and rear of the engine 8 for blocking noise of the engine 8. May be the partition wall W,
Alternatively, a firewall FW for isolating the oil pump 26 and the engine 8 may be provided as needed. As shown in FIGS. 1 and 2, the partition wall W such as the front partition Wa, the side partition Wb, the rear partition Wc, the bottom partition Wd, the upper partition We, and the like around the engine 8 or the engine 8 and the oil pump 26. A so-called enclosure may be used.

Also, there is no partition wall Db, partition wall W, firewall FW, etc., and a so-called engine room ER is not necessarily provided. If necessary, the partition wall Db, partition wall W, firewall FW, etc. Is provided. Further, as shown in FIG. 1, the intercooler IC is provided in front of the cooling fan 52 provided on the front side of the engine 8, but the position of the intercooler IC is not limited to the above-described position. However, it may be arranged substantially horizontally above the engine 8,
Or may be arranged behind the hydraulic pump 26,
The engine room ER in front of the engine 8 shown in FIG.
May be arranged on the front side.

Further, as shown in FIG.
The hydraulic motor 52a, which is the second driving means 51, is connected to the hydraulic pump 26 driven by the engine 8 via a hydraulic pipeline 26a, and the first cooling fan 52 is mounted on the output shaft of the hydraulic motor 52a. I have. An air cleaner AC is provided on the upper side of the engine 8 as shown in FIG. 1, and the air cleaner AC is connected to the turbocharger 102 via an air pipe 100.

As shown in FIGS. 1 and 2, the air supercharged by the turbocharger 102, which is a supercharger disposed above the engine 8 in the engine room ER, is supplied from the turbocharger 102. Air piping 1 through air outlet 27a
04 is connected to the intercooler IC. or,
The engine 8 shown in FIG. 1, the radiator 40 separated from the intercooler IC, the oil cooler 50, and the driving means 501 of the second cooling fan 53 for cooling them.
Are separately provided outside the engine room ER.

The driving means 501 of the second cooling fan 53
In the case of the present embodiment, as shown by the solid line in FIG. 1, similarly to the hydraulic motor 52a which is the driving means 51 of the first cooling fan 52, the second pump is connected via the hydraulic pump 26 and the hydraulic pipe 26a. The cooling fan 53 is connected to a hydraulic motor 52 a which is a driving unit 501 of the cooling fan 53. In the above embodiment, the driving unit 5 of the first cooling fan 52 and the second cooling fan 53
Although the case where the hydraulic motor 52a is applied as 1, 501 has been described, the present invention is not limited to this. For example, as shown by a two-dot chain line in FIG.
Instead of a, the first or second output shaft of each electric motor 52d operated by being supplied with power from the power supply SK driven by the engine 8 via the electric circuit EP.
The cooling fans 52 and 53 may be connected.

Although not shown, the driving means 51, 501 of the first and second cooling fans 52, 53 are driven by an engine 8 used for a cooling system such as a radiator of a general engine. A belt drive mechanism using a pulley and a belt which are not used may be used. Further, in the present embodiment, the intercooler IC, the radiator 40, the oil cooler 50, the first and second cooling fans 52, 53, and the driving means 51, 50 for the first and second cooling fans 52, 53.
The hydraulic pump 26, the hydraulic motor 52a, the electric motor 52d, the power supply SK, etc., which are 1, are referred to as a cooling device.

In the above embodiment, the case where the turbocharger 102 is used as the supercharger has been described.
Even when a supercharger is applied, a similar effect can be obtained. Since the present embodiment is configured as described above, when the engine 8 operates as shown in FIGS. 1 and 2, cooling air is taken into the engine room ER by the first cooling fan 52 as shown by the arrow Y. After being supplied from the inlet 46 and cooling the intercooler IC, the engine 8, the oil pump 26 and the like are further cooled and the engine room ER
From the rear side outlet 47b or the upper outlet 47a of the engine hood EF of the engine 8 or the like.

At this time, since the cooling air that has cooled the intercooler IC only cools the compressed air that has been taken in by the turbocharger 102 via the air cleaner AC, the cooling air is cooled after cooling the oil cooler 50 and the radiator 40 described above. The temperature of the cooling air is significantly lower than that of the above-described cooling air, and the engine 8 and the oil pump 26 are cooled by the low-temperature cooling air. The size can be reduced, and the intercooler IC and the first cooling fan 52 can be reduced in size.

Further, even in the case of the conventional cooling fan 52, the cooling effect can be obtained even when the number of rotations is low, so that noise can be suppressed.
In addition, the engine room ER is used for soundproofing the engine 8,
For example, in the case of an enclosure that surrounds the entire periphery of the engine 8 (for example, six surfaces of the engine), the engine 8 surrounds at least substantially the entire periphery of the engine 8 as much as possible.
Engine room ER while minimizing noise
The inside can be cooled effectively.

Then, the first intercooler IC is used.
Since the cooling fan 52 can be used also as a cooling fan for the engine room ER, it can be made compact as a whole, inexpensive, and when the engine 8 is installed vertically, the conventional intercooler IC and oil cooler are used. 50,
Compared to the case where the radiators 40 are arranged in series, the length in the vehicle longitudinal direction can be shortened, so that there is an advantage that the rear end radius of rotation of the hydraulic shovel can be reduced.

A hydraulic circuit OP including a hydraulic pipe 26a and the like
Hydraulic motor 52 controlled by controller CR during
a control means S1 for controlling the number of revolutions of
A supercharged air temperature sensor T for detecting the temperature of the ambient temperature sensor T1 in the engine room ER and the temperature of the intercooler IC in R
2 is input to the control means S1 via the controller CR, the hydraulic motor 52a is controlled in accordance with the temperature signal, and the first cooling fan 52 is operated. The ER, the engine 8, the oil pump 26, the intercooler IC, and the like can be cooled accurately and efficiently, while suppressing noise.

For example, although not shown, when the hydraulic motor 52a is a constant displacement type hydraulic motor, the control means S1 may comprise a flow control valve in the hydraulic circuit OP, or may be an axial piston type which is a variable displacement type hydraulic motor. In the case of the swash plate type hydraulic motor, the swash plate is constituted by a variable capacity mechanism of the swash plate that controls the rotation speed of the hydraulic motor by changing the angle of the swash plate.

In the case of the electric motor 52d,
For example, as shown in FIG. 1, the electric circuit EP is provided with a control means S2 for controlling current and electric resistance to control the amount of current to the electric motor 52d.
As in the case of a, the number of rotations of the electric motor 52d is controlled according to the temperature detected by at least one of the temperature sensors T1 and T2.
The same functions and effects as those of the hydraulic motor 52a can be obtained.

The temperature detected by the ambient temperature sensor T1 in the engine room ER is equal to the temperature of the engine room ER.
And the temperature of the engine 8, the engine room ER, the oil pump 26, etc., and the temperature of the engine exhaust system muffler M, the turbocharger 102, the firewall, etc., which are more likely to stay, such as the engine exhaust system muffler M, the firewall, etc. The temperature of the high temperature section sensor T1h for detecting the temperature and the temperature detected by the supercharged air temperature sensor T2 of the intercooler are the temperature of the air flowing through the intercooler IC and the temperature of the intercooler IC.
Is the temperature of the cooling air or the like after cooling the at least one of the above temperatures, and at least one of these temperatures is applied.

Also, a condenser for a relatively low temperature air conditioner is provided in front of the intercooler IC,
In addition, even when cooling is performed by the first cooling fan 52, substantially the same operation and effect as the above embodiment can be obtained.
Further, since it is sufficient to cool the air supply from the turbocharger 102 whose temperature is significantly lower than that of the oil cooler 50 and the radiator 40, the first cooling fan 5 for the intercooler IC can be cooled.
2 can be made smaller and can also be used as a cooling fan for cooling the engine, which is usually provided in the engine room, so that the size and cost can be reduced.

Further, as described above, the oil cooler 50 and the radiator 40 are separated from the engine room ER and separately provided, so that when the engine is placed horizontally, the entire width w of the upper revolving unit 2 is reduced by the transportation of the hydraulic shovel. The width of the upper revolving unit 2 can be reduced to improve the transportability, or when the engine is installed vertically, the length in the front-rear direction is shortened, and the rear turning radius of the upper revolving unit 2 is reduced to improve workability. can do.

Further, since the intercooler IC has been removed from the front, the intercooler IC, the oil cooler 50, the radiator 40, and the cooling fan are arranged in comparison with the case where the intercooler IC is arranged in series.
Since the heat radiation area on the front surface of the core of the oil cooler 50 and the radiator 40 can be reduced, the size can be reduced, and the manufacturing cost can be reduced. A second cooling fan 53 for cooling the oil cooler 50 and the radiator 40 is provided.
When the hydraulic motor 52a is applied to the drive means 501, the horsepower consumed by the second cooling fan 53 increases, but the rotation speed can be controlled in the same manner as the first cooling fan 52 of the intercooler IC. The oil cooler 50, the radiator 40, and the like can be accurately and efficiently cooled while suppressing noise.

The oil cooler 50 and the radiator 4
The driving means 501 of the second cooling fan 53 for cooling 0
Similarly to the control of the rotation speed of the first cooling fan 52 of the intercooler IC, a hydraulic oil temperature sensor T3 for detecting an oil temperature of hydraulic oil of the oil cooler 50 and a cooling water temperature sensor T4 for detecting a cooling water temperature of the radiator 40. , Oil cooler 50
And the temperature of at least one of the cooling air temperature sensors T5 and the like for detecting the temperature of the cooling air after passing through the radiator 40 and the like.
0, the radiator 40 and the like can be operated accurately and efficiently, and can be effectively cooled while suppressing noise.

In the above embodiment, the intercooler IC is used.
Has described the case where an air-cooled intercooler IC is used, but a radiator for a water-cooled intercooler is disposed at a position where the air-cooled intercooler IC is disposed, and the cooling water from a water pump driven by an engine 8 (not shown) Even if the cooling water cooled by the water-cooled intercooler IC is caused to flow through the intercooler core, and thereby the supercharged air from the turbocharger is cooled and supplied to the intake manifold of the engine 8, substantially the same operation and effect as described above can be obtained. Can be.

Further, in addition to the above, as shown in FIG. 2, an muffler M is provided in an exhaust system of the engine 8 in an exhaust pipe 8a of the engine 8, and an outlet of the muffler M is provided. If an ejector EJ composed of an outer pipe and an inner pipe which sucks heated air in the engine room ER and discharges it to the outside by using the engine exhaust pressure discharged to the outside is provided in a part of the upper partition wall We of the room ER. , The engine room ER, the engine 8, the hydraulic pump 26 and the like can be more effectively cooled to improve the cooling efficiency.

The ejector EJ includes an exhaust outlet end M1 of an exhaust pipe 8a extending from the muffler M as an inner pipe projecting from the muffler M, and an exhaust outlet end M1 of the exhaust pipe 8a.
Pipe M2 as an outer pipe protruding from the engine room ER longer than the exhaust outlet end M1 with a space around
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.

If necessary, a number of slit-shaped intake ports R1 are provided in the bottom wall Wd of the engine room ER located on the opposite side of the ejector EJ via the air passage EY in the engine room. By promoting ventilation in the ER, the cooling efficiency can be improved. or,
The intake ports R1 each include a looper R as a noise suppression unit NS that suppresses leakage of engine noise to the outside of the engine room ER, and these loopers R are formed by being cut and raised from the respective air ports R1. ing.

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 is also negative. The air in the room ER can be sucked together with the heat and forcibly discharged to the outside.

When the ejector WJ is provided, the first cooling fan 52 can be omitted when the ejector WJ can sufficiently cool down, and the cost can be reduced.

[0050]

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. An oil cooler that cools the high-temperature working oil that is transmitted back to a traveling device or a working device of the construction machine and returns, a radiator that cools cooling water of the engine, and a supply of the engine by a supercharger. In a cooling device of a construction machine having an intercooler for cooling air,
The intercooler is disposed in front of, behind, or above the engine, and a first cooling fan for cooling the intercooler and a driving means for the first cooling fan are disposed. The oil cooler and the radiator are connected to the engine. And a second cooling fan that is disposed separately from the intercooler and cools the oil cooler and the radiator, and a driving unit for the second cooling fan is disposed, so that the low-temperature cooling air that cools the intercooler is used. The engine, the oil pump and the like can be effectively cooled, and the noise can be reduced by lowering the rotation speed of the cooling fan.

Since the first cooling fan can be used also as a cooling fan for an engine, an oil pump or the like, the cost can be reduced and the size can be reduced. Further, since the intercooler and the first cooling fan are provided with the oil cooler and the radiator separately provided and the second cooling fan for cooling the oil cooler and the radiator, the cooling efficiency of the oil cooler and the radiator is provided. And the heat radiation area on the front surface of the core of the oil cooler and radiator can be reduced, the rotation of the cooling fan can be reduced, and the noise can be reduced.

According to the cooling device for a construction machine of the present invention, high-pressure hydraulic oil from a hydraulic pump driven by an engine mounted on the construction machine is supplied to the traveling device, the working device and the like of the construction machine. An oil cooler that cools the high-temperature working oil that is returned to the engine, a radiator that cools the cooling water of the engine, and an intercooler that cools air supplied by a supercharger of the engine. In a cooling device for a construction machine, a first cooling fan for arranging the intercooler in front of, behind, or above the engine housed in an engine room of the engine and for cooling the intercooler, and driving the first cooling fan Means are arranged, the oil cooler and the radiator are separately arranged outside the engine room, and the oil cooler and the radiator are arranged separately. Since the second cooling fan for cooling the radiator and the driving means for the second cooling fan are provided, the above-described engine can be cooled with the cooling air having a lower temperature than the cooling air after cooling the oil cooler and the radiator. , Since the oil pump is cooled, the engine room can be reduced in size, the first cooling fan can be reduced in size, or the number of revolutions of the first cooling fan can be reduced and the cooling effect can be obtained. Noise can be suppressed.

In the case where the engine room is for soundproofing the engine and the engine room is, for example, an engine enclosure or a firewall, the engine room surrounds the engine as much as possible. Can be performed. The first cooling fan of the intercooler can also be used as a cooling fan for the engine room, so that the overall cooling can be made compact, the cost can be reduced, and the turning radius of the hydraulic shovel can be reduced. There is an advantage that the range of action can be expanded.

According to a third aspect of the present invention, in the construction apparatus according to the first or second aspect, the first cooling fan of the intercooler and the second cooling fan of the oil cooler and the radiator are hydraulically driven. Since it is configured to be driven by a motor, an electric motor, or the above-described engine, it can be appropriately selected and applied according to design specifications, and the degree of freedom in design is expanded.

According to the cooling device for a construction machine of the present invention described in claim 4, in the configuration according to claim 3, the above-mentioned first device is provided.
In a hydraulic circuit that drives a hydraulic motor connected to a cooling fan with operating hydraulic pressure from the hydraulic pump or in an electric circuit that drives an electric motor connected to the first cooling fan,
A control means for controlling the number of revolutions of the hydraulic motor or the electric motor is provided, and an ambient temperature sensor for detecting an ambient temperature in the engine room and a supercharged air temperature sensor for detecting a supercharged air temperature of the intercooler. At least one of the temperature sensors, the temperature sensor and the control means are connected via a controller, and the hydraulic motor or the electric motor is driven by a command signal from the controller corresponding to the temperature detected by the temperature sensor. Since the rotation speed is controlled, the temperature sensor detects the ambient temperature in the engine room or the supercharged air temperature of the intercooler and outputs the command signal, and determines the rotation speed of the hydraulic motor or the electric motor. Control the engine room, engine, oil pump or intercooler properly Can be fruit cooled.

According to a fifth aspect of the present invention, in the construction machine cooling device according to the third or fourth aspect, the hydraulic motor connected to the second cooling fan is operated by the hydraulic pump by operating hydraulic pressure. A control means for controlling the number of revolutions of the hydraulic motor or the electric motor is provided in a hydraulic circuit to be driven or in an electric circuit for driving an electric motor connected to the second cooling fan, and a hydraulic oil for the oil cooler is provided. At least one of a hydraulic oil temperature sensor for detecting the temperature of the cooling water, a cooling water temperature sensor for detecting the temperature of the cooling water of the radiator, and a cooling air temperature sensor for detecting the temperature of the cooling air after passing through the oil cooler and the radiator. One temperature sensor, wherein the temperature sensor and the control means are connected via a controller, and the temperature sensor corresponds to a temperature detected by the temperature sensor. Since so as to control the rotational speed of the hydraulic motor or an electric motor by a command signal from the controller, said oil cooler by the temperature sensor,
Detecting the temperature of the radiator or the supercharged air temperature of the intercooler, outputting the command signal, controlling the rotation speed of the hydraulic motor or the electric motor, and accurately and effectively controlling the temperature of the oil cooler and the radiator. Can be cooled.

According to the cooling apparatus for a construction machine according to the present invention, in the construction according to any one of the first, second, and fifth aspects, the exhaust gas of the exhaust pipe of the engine disposed in the engine room is provided. An ejector comprising an outlet end and a suction pipe provided at a partition wall constituting an engine room at a distance from at least the exhaust outlet end and projecting longer than the exhaust outlet end; With the configuration in which the heated air in the engine room is sucked and discharged to the outside by using the above, each part in the engine room can be effectively cooled.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory view showing one embodiment of the present invention and showing a state similar to FIG. 4;

FIG. 2 is a schematic explanatory diagram showing a view in the direction of arrow A in FIG. 1;

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

FIG. 4 is a schematic explanatory view showing a plan view of FIG. 3;

[Explanation of symbols]

 2 Upper revolving unit 4 Lower traveling unit 6 Working device 8 Engine 8a Exhaust pipe 12 Revolving device 15 Operator room 16 Car body 18 Track roller frame 20 Traveling device 22 Bucket 24 Boom 26 Hydraulic pump 26a Hydraulic piping 30 Hydraulic oil tank 31 Fuel tank 33 Storage box 40 Radiator 46 Inlet for cooling air 47 Outlet for cooling air 50 Oil cooler 51 Driving means for first cooling fan 501 Driving means for second cooling fan 52 First cooling fan 52a Hydraulic motor 52d Electric motor 53 Second cooling Fan 102 Turbocharger (Turbocharger) AC Air cleaner CR Controller EJ Ejector EP Electric circuit ER Engine room IC Intercooler M Muffler M1 Exhaust outlet end M2 Suction pipe M3 Suction gap OP Hydraulic circuit S , S2 control unit SK feeder

Claims (6)

[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. An oil cooler that cools the engine, a radiator that cools the cooling water of the engine, and an intercooler that cools air supplied by a supercharger of the engine. A first cooling fan for cooling the intercooler and a driving means for the first cooling fan disposed rearward or upward, and the oil cooler and the radiator are separately provided from the engine and the intercooler; And a second cooling fan for cooling the oil cooler and the radiator and driving means for the second cooling fan. Characterized by a cooling device for construction machinery. 2. The high-pressure hydraulic oil which is transmitted from a hydraulic pump driven by an engine mounted on the construction machine to a traveling device, a working device or the like of the construction machine and returns. An oil cooler for cooling the engine, a radiator for cooling the cooling water of the engine, and an intercooler for cooling air supplied by a supercharger of the engine, wherein the intercooler is provided in an engine room of the engine. A first cooling fan for cooling the intercooler and a driving means for the first cooling fan are disposed in front of, behind, or above the engine housed in the engine, and the oil cooler and the radiator are connected to each other. A second cooling fan, which is separately provided outside the engine room and cools the oil cooler and the radiator, and the second cooling fan A cooling device for a construction machine, wherein a fan driving means is provided. 3. A driving means for driving the first cooling fan of the intercooler and the driving means of the oil cooler and the second cooling fan of the radiator, respectively, is driven by a hydraulic motor, an electric motor, or the engine. Or a cooling device for a construction machine according to item 2. 4. In a hydraulic circuit for driving a hydraulic motor connected to the first cooling fan by operating hydraulic pressure from the hydraulic pump, or in an electric circuit for driving an electric motor connected to the first cooling fan. A control means for controlling the number of rotations of the hydraulic motor or the electric motor, and an ambient temperature sensor for detecting an ambient temperature in the engine room and a supercharged air temperature sensor for detecting a supercharged air temperature of the intercooler. The temperature sensor and the control means are connected via a controller, and the hydraulic motor or the electric motor is driven by a command signal from the controller corresponding to the temperature detected by the temperature sensor. 4. The cooling device for a construction machine according to claim 3, wherein the number of rotations is controlled. 5. A hydraulic circuit for driving a hydraulic motor connected to the second cooling fan by operating hydraulic pressure from the hydraulic pump or an electric circuit for driving an electric motor connected to the second cooling fan. A control means for controlling the number of rotations of the hydraulic motor or the electric motor, a hydraulic oil temperature sensor for detecting a temperature of hydraulic oil for the oil cooler, a cooling water temperature sensor for detecting a cooling water temperature of the radiator,
It has at least one temperature sensor of a cooling air temperature sensor for detecting a temperature of the cooling air after passing through an oil cooler and a radiator, and connects the temperature sensor and the control means via a controller. 4. The apparatus according to claim 3, wherein a rotation speed of the hydraulic motor or the electric motor is controlled by a command signal from the controller corresponding to a temperature detected by the temperature sensor.
Or a cooling device for a construction machine according to 4. 6. An exhaust port end of an exhaust pipe of an engine provided in the engine room, and protruding longer than the exhaust outlet end at least with a space from the exhaust outlet end, and constitutes an engine room. An ejector comprising a suction pipe provided on a partition wall to be heated, 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 2 and 5.