JP3511280B2 - 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, bulldozers, wheel loaders, and 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, bulldozers, wheel loaders, and track loaders are used for excavating rocks such as dams, tunnels, rivers and roads in mountainous areas, and for demolition of buildings and buildings. It is used for etc., extremely high atmospheric temperature under hot weather, and in the severe conditions of the scaffolding and ground surface of the work site, in order to avoid overloading with the maximum capacity output for the construction machine, Moreover, continuous operation is often required.

Regarding the structure of the construction machine, for example, a hydraulic excavator will be described. The basic structure of the hydraulic excavator is as follows.
As shown in FIGS. 6 and 7, the upper revolving superstructure 2 supports the upper revolving superstructure 2 so as to be revolvable and is provided on the lower side of the upper revolving superstructure 2. It is composed of three parts of the work device 6 for performing work. And
The upper swing body 2 includes an engine 8, a hydraulic device (not shown), a swing device 12, an operator room 15, and the like.
The undercarriage 4 is composed of a car body 16, a track roller frame 18, a traveling device 20 and other non-illustrated undercarriage devices, and the working device 6 further operates a boom 24 and an arm 25 for supporting the bucket 22, and the arm 24. It is composed of various hydraulic cylinders, link rods, and the like.

Although not shown, the working device 6,
A hydraulic device for operating actuators such as the traveling device 20 and the turning device 12 is provided. Further, as shown in FIGS. 6 and 7, the upper swing body 2 of the conventional hydraulic excavator is
Includes an engine 8 which is a prime mover, a hydraulic pump 26 which is driven by the engine 8, and an actuator which is driven by pressure oil discharged from the hydraulic pump 26, for example, a boom 24 shown in FIG. The boom cylinder 24a, the control valve 70 for controlling the flow of pressure oil supplied from the hydraulic pump 26 to the actuator such as the boom cylinder 24a, the hydraulic pipes 73, 74 for connecting the control valve 70 and the boom cylinder 24a, and Hydraulic pipes 73a, 74 for connecting the control valve 70 to another actuator (not shown)
a, a fuel tank 31 for supplying fuel to the engine 8,
A hydraulic oil tank 30 for accumulating hydraulic oil supplied to the hydraulic pump 26, a hydraulic pipe 76 for connecting the hydraulic oil tank 30 and the hydraulic pump 26, and a delivery hose 78 for connecting the hydraulic pump 26 and the control valve 70. , A hydraulic pipe 75 connecting the control valve 70 and the oil cooler 50, and the oil cooler 50 and the hydraulic oil tank 30.
And a storage box 33 and an operator room 15.

The hydraulic oil discharged by the hydraulic pump 26 driven by the engine 8 and appropriately pressurized according to design specifications, for example, the hydraulic oil having a high pressure of, for example, about 140 to 300 kg / cm ² is controlled by the control valve 70. The low-pressure oil is controlled and transmitted to the above-mentioned devices to carry out various operations to form low-pressure oil, which again returns to the hydraulic oil tank 30 via the control valve 70 and is circulated again by the hydraulic pump 26.

Further, as shown in FIG. 7, the turbocharger 102 provided on the upper portion of the engine 8 is provided with an air pipe 10.
4 to the intercooler IC, and from the intercooler IC to the intake manifold of the engine 8 via the air pipe 106. Further, while the construction machine is in operation, the hydraulic pump 26 is controlled so as to output the maximum capacity according to the operation of the operator, and the construction machine continuously operates all day long in a limit region where it does not become overloaded. Often.

Therefore, while the hydraulic oil is discharged from the hydraulic pump 26 and returns to the oil cooler 50 side while continuing circulation, heat generation due to pressure loss in this hydraulic circuit,
The operating oil temperature continues to rise little by little due to the heat generated when the pressure oil escapes from the relief valve and the heat generated by the sliding friction of each actuator. As a result, if the construction machine is continuously operated as it is, the temperature of the working oil finally rises to a temperature above the maximum usable temperature of the working oil of the construction machine.

The maximum temperature at which this hydraulic oil can be used differs depending on the size of the construction machine, the design specifications, the type of hydraulic oil used, and the like. When the temperature is higher than the temperature, there is a possibility that the seal or the like (not shown) may be deteriorated or the rotating portion may be burned due to deterioration of the lubricating oil performance. Therefore, the working oil returned by the above-described work is arranged so as to be superposed on the front surface of the 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 30, and circulated through the above path again.

The engine is arranged transversely with respect to the front-rear direction of the upper revolving superstructure 2. The cooling device for this hydraulic excavator is a cooling device mounted in front of the engine 8 as shown in FIG. An intercooler IC for the supercharger of the engine 8, an oil cooler 50, and a radiator 40 are arranged in series in front of the fan 52. The intercooler IC is usually arranged at the most windward side of the cooling air. Has been done.

By the way, in the case of the hydraulic excavator,
As the output of the engine 8 increases, the heat exchangers such as the radiator 40 also become large, and the horsepower consumption of the cooling fan 52 required to cool the heat exchangers also increases. And
As shown in FIG. 7, 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.

Further, as another conventional example, an actual flat blade 4-134.
According to the technique described in Japanese Patent No. 565, although not shown, the engine is installed horizontally in the engine chamber of the upper revolving structure, the oil cooler and the radiator are separately arranged, and the oil cooler is a fan for cooling the oil cooler. The radiators are each cooled by an engine fan provided in the engine so that the radiators can be easily cleaned of clogging.

Further, another conventional example, Japanese Patent Laid-Open No. 9-1259.
According to the technique described in Japanese Patent Publication No. 72, although not shown, the engine is horizontally arranged in an engine chamber of an upper swing body, and an oil cooler for cooling hydraulic oil by a fan driven by the engine and an engine cooling water are cooled. A cooling device for a hydraulic excavator having a radiator and an intercooler for cooling the supply air from a turbocharger, wherein the oil cooler and the radiator are provided in front of a cooling fan of the engine in an engine room storing the engine. And the intercooler is separately installed outside the engine room, and by eliminating the intercooler installed in the engine room, the intercooler of the front surface of the core of the oil cooler and the radiator is removed. The heat dissipation area is smaller than before, making it easy to manufacture the heat exchanger and reducing the cost. It is.

[0013]

However, in the conventional cooling device as shown in FIG. 7, the intercooler I is used.
Intercooler IC because C is located on the most windward side
As the temperature of the cooling air flowing through the radiator rises,
The cooling capacity of other heat exchangers such as the oil cooler 50 decreases.

Therefore, it is necessary to use a heat exchanger having a large cooling capacity. However, the size of the heat exchanger is limited to the oil cooler 50 and the radiator 4 because of problems such as the arrangement space.
The core area of 0 cannot be carelessly increased, and there is a manufacturing limit. If a large heat exchanger is used, vibration of the machine body may cause cracks in the core.

Therefore, particularly when manufacturing a large hydraulic excavator, it is necessary to prevent the temperature of the cooling water and the temperature of the hydraulic oil of the engine from overheating and to reduce the size of the heat exchanger. In particular, in the case of a large hydraulic excavator, the upper revolving structure 2 becomes large because a large engine or the like is mounted, and the engine 8 is placed horizontally or vertically on the upper revolving structure 2 and the intercooler IC is provided in front of the engine 8. Since the oil cooler 50 and the radiator 40 are arranged in series, as shown in FIG. 7, if the width w of the upper swing body 2 becomes large and exceeds the lateral width limit during vehicle body transportation, it cannot be transported beyond the trailer carrier. If the engine 8 is placed vertically with respect to the front-rear direction of the upper revolving superstructure 2, the length in the front-rear direction becomes long, and the rear end turning radius of the upper revolving superstructure 2 becomes large. The range is restricted.

Further, the technique disclosed in Japanese Patent Laid-Open No. 9-125972 is a conventional example, in which the radiator and the oil are installed in front of a cooling fan directly connected to the front of the engine installed in the engine room. Since the cooling air that has cooled the cooler and has a high temperature is further cooled to cool the engine and the hydraulic pump and is discharged to the outside of the machine, the cooling efficiency for the engine and the hydraulic pump is reduced, and The hydraulic oil may not be cooled efficiently.

Further, since the cooling air that has cooled the radiator and the oil cooler is a fairly high temperature fluid, in order to efficiently cool the engine and the hydraulic pump, the engine and the hydraulic pump and the engine room are efficiently cooled. The clearance between the inner wall and the inner wall must be more than a predetermined value to reduce the flow resistance of the cooling air as much as possible, and the storage capacity of the engine room must be increased in order to ensure smooth flow, which increases the overall size of the hydraulic excavator. As described above, the restrictions on the transportation of the hydraulic excavator and the rear end turning radius of the upper swing body 2 increase, and the action range is restricted.

The present invention was devised in view of these problems. The oil cooler for hydraulic oil of the construction machine, the radiator of the engine, and the cooling fan for cooling them are separated from the engine and omitted. Place them upright and side by side, with the center side between the above one side and the other side above
The hydraulic oil tank for the above hydraulic oil is located in front of the counterweight.
And one of the fuel tanks of the above engine
A tank is provided and the other tank is installed at the rear of the operator room.
Installed on the upper part of either tank
Above the substantially horizontal or inclined surface, the above oil cooler,
It is an object of the present invention to provide a cooling device for a construction machine, in which radiators are provided substantially vertically and in parallel and the cooling effect of the engine, engine room, cooling water, hydraulic oil and the like is improved.

[0019]

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 engine room is provided on one side of the front end of the construction machine in the front-rear direction, and the engine is installed vertically on the other side opposite to the one side in the front-rear direction along the operator room, and the engine. A first cooling fan for cooling the vehicle and a driving means for driving the first cooling fan are provided, and a shape is formed by the counter weight provided at the rear part of the construction machine, the operator room, and the engine. The engine and the oil cooler provided in a separate place during the space that is, the radiator
The center side portion between the one side portion and the other side portion.
In front of the unta weight, the hydraulic oil tank for the above hydraulic oil and
One of the fuel tanks of the above engine
And the other tank at the rear of the operator room.
Configure the upper part of either of the above tanks
Above the substantially horizontal or inclined surface, the above oil cooler and radiator
A second cooling fan for cooling the oil cooler and the radiator and a second cooling fan for cooling the oil cooler and the radiator, which are installed substantially vertically and in parallel .
It is characterized in that a driving means for driving the cooling fan is provided.

According to a second aspect of the present invention, there is provided a cooling device for a construction machine, wherein high pressure hydraulic oil from a hydraulic pump driven by an engine mounted on the construction machine is transmitted to a traveling device, a working device, etc. of the construction machine. In the cooling device for the construction machine, which includes an oil cooler that cools the high-temperature hydraulic oil that returns and returns, and a radiator that cools the cooling water of the engine, a front end portion in the front-rear direction of the construction machine. An operator room is provided on one side, and the engine is installed vertically on the other side opposite to the one side in the front-rear direction along the operator room, a first cooling fan for cooling the engine, and Driving means for driving the first cooling fan is provided, and the driving means is provided separately from the engine between the rear portion of the operator room and the counterweight provided at the rear portion of the construction machine at the one side. The above oil cooler that is, having a radiator, a central side portion between said one side and the other side
In front of the counterweight, press the hydraulic oil
Or one of the above engine fuel tanks
One tank is installed and the other tank is installed in the operator room.
It is installed at the rear, and the top of either tank
Above the above-mentioned substantially horizontal surface or inclined surface,
It is characterized in that a radiator and a radiator are provided substantially upright and in parallel, and a second cooling fan for cooling the oil cooler and the radiator and a driving means for driving the second cooling fan are provided.

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 , in which the high pressure hydraulic oil from a hydraulic pump driven by an engine mounted on the construction machine is used for the construction. In a cooling device for a construction machine, which includes an oil cooler for cooling the working oil that has returned to a high temperature and is transmitted to a traveling device of a machine, a working device, etc., 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 is installed vertically on the other side opposite to the one side along the operator room in the front-rear direction. A first cooling fan for cooling an engine and the first cooling fan
A drive means for driving a cooling fan is provided, and the oil cooler provided separately from the engine between the rear portion of the operator room and the counterweight provided at the rear portion of the construction machine on the one side. Radiators are provided substantially in series and in parallel in the vehicle width direction of the construction machine, and the oil cooler, a second cooling fan for cooling the radiator, and a drive means for driving the second cooling fan are provided. .

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 oil cooler is arranged so as to face the front surface of the counterweight and be parallel to the vehicle width direction of the construction machine. , A radiator is provided, and the oil cooler, a second cooling fan for cooling the radiator, and a driving means for driving the second cooling fan are provided.

According to a fifth aspect of the present invention, there is provided a cooling device for a construction machine according to the third aspect, wherein the working oil is arranged so as to face the front surface of the counterweight and to be parallel to the vehicle width direction of the construction machine. A tank and a fuel tank are provided, the oil cooler and the radiator are provided so as to face the front surfaces of the hydraulic oil tank and the fuel tank and are arranged in parallel in the vehicle width direction, and the second oil cooler and the radiator are cooled. It is characterized in that a driving means for driving the cooling fan and the second cooling fan is provided.

[0024]

The cooling device for a construction machine according to a sixth aspect of the present invention is the cooling device for a construction machine according to the first or second aspect , wherein the oil cooler and the radiator are substantially upright on the upper side of the other tank and before and after the construction machine. The feature is that they are provided in parallel in the direction. A cooling device for a construction machine according to a seventh aspect of the present invention is the cooling device for a construction machine according to the fourth or fifth aspect.
At least one of the two tanks is arranged below the cooling fan, or both tanks are arranged in parallel so as to correspond to the lower side of the second cooling fan. I am trying.

A cooling device for a construction machine according to an eighth aspect of the present invention has the structure according to any one of the first to third aspects.
An operator room is provided on one side of the front end of the construction machine in the front-rear direction, and an engine room for vertically storing the engine connected to the hydraulic pump is provided on the other side opposite to the one side. It is characterized by having done. A cooling device for a construction machine according to a ninth aspect of the present invention, in the configuration according to any one of the first to eighth aspects, is configured so as to polymerize with a front side, an upper side, a rear side of the engine, or the radiator or the oil cooler. An intercooler of the engine provided and the first cooling fan or the second cooling fan for cooling the intercooler are provided.

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 ninth aspects, wherein the cooling air for the oil cooler and the radiator is directed to a side portion of the construction machine. From the inlet (outer side opening) in at least one of the front direction and the vertical direction, from the discharge port (rear side opening) provided in at least one of the rear upper direction and the rear direction It is characterized in that the cooling air is discharged from the rear side opening (exhaust port) and is discharged from the outer side opening (intake port).

According to an eleventh aspect of the present invention, there is provided a cooling device for a construction machine according to any one of the first to tenth aspects, wherein the driving means for the first and second cooling fans are a hydraulic motor or an electric motor, respectively. It is characterized by being driven by at least one of a motor and the above engine. A cooling device for a construction machine according to a twelfth aspect of the present invention is, in the configuration according to the eleventh aspect , in a hydraulic circuit for driving a hydraulic motor connected to the first cooling fan with an operating hydraulic pressure from a hydraulic pump, or 1. An electric circuit for driving an electric motor connected to a cooling fan is provided with a control means for controlling the rotational speed of the hydraulic motor or the electric motor, and an atmospheric temperature sensor for detecting an atmospheric temperature in the engine room, and At least one of the supercharged air temperature sensor for detecting the supercharged air temperature of the intercooler of the engine has a temperature sensor, the temperature sensor and the control means are connected via a controller,
It is characterized in that the rotational speed of the hydraulic motor or the electric motor is controlled by a command signal from the controller corresponding to the temperature detected by the temperature sensor.

According to a thirteenth aspect of the cooling apparatus for a construction machine of the present invention, in the constitution according to the eleventh aspect or the twelfth aspect, the hydraulic motor connected to the second cooling fan is driven by an operating hydraulic pressure from a hydraulic pump. A control means for controlling the rotational speed of the hydraulic motor or the electric motor is provided in the hydraulic circuit or an electric circuit for driving the electric motor connected to the second cooling fan, and the temperature of the working oil of the oil cooler is detected. At least one of a working oil temperature sensor, a cooling water temperature sensor that detects the cooling water temperature of the radiator, and a cooling air temperature sensor that detects the temperature of the cooling air after passing through an oil cooler and a radiator, etc. A temperature sensor is provided, and the temperature sensor and the control means are connected via a controller so that the temperature detected by the temperature sensor can be handled. It is characterized in that so as to control the rotational speed of the hydraulic motor or an electric motor by a command signal from the controller.

According to a fourteenth aspect of the present invention, in the cooling device for a construction machine according to the eighth aspect , the exhaust outlet end portion of the exhaust pipe of the engine disposed in the engine room is provided.
An ejector comprising at least a suction pipe provided at a partition wall forming an engine room and projecting longer than the exhaust outlet end at a distance from the exhaust outlet end,
It is characterized in that the exhaust air pressure of the engine is used to suck the heated air in the engine room and discharge it to the outside.

[0031]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. A case where 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.
Portions substantially the same as those of the conventional hydraulic excavator shown in FIGS. 6 and 7 will be described with the same reference numerals.

FIG. 1 shows an embodiment of the present invention.
FIG. 2 is a schematic explanatory view showing a state similar to FIG. 7, and FIG.
A schematic explanatory view showing a cross section taken along line A-2A, FIG. 3 is an explanatory view showing a modified example of the embodiment of the present invention shown in FIG. 1, and FIG. 4 is another example of the embodiment of the present invention shown in FIG. FIG. 5 is an explanatory diagram showing a modified example, and FIG. 5 is a schematic explanatory diagram showing an arrow A of FIG. 1 showing another application example of the above embodiment.

As shown in FIGS. 1 and 2, an operator chamber 15 is provided on one side portion 1a in the front and rear direction of the construction machine in the left-right direction, and the other side portion 1b opposite to the one side portion 1a.
An engine room ER for vertically storing the engine 8 to which a hydraulic pump 26 is connected is provided.
Is provided with a first cooling fan 52. or,
The engine room ER may be a simple partition wall that separates the engine 8 from other various hydraulic devices or the like, or may be a partition wall that constitutes an enclosure provided so as to surround the engine 8 for blocking the noise of the engine 8. Alternatively, a firewall that isolates the hydraulic pump 26 from the engine 8 and surrounds the engine 8 may be used.

In the above-mentioned enclosure, for example, the front partition wall Wa, the side partition wall Wb, the rear partition wall Wc, the bottom portion around the engine 8 or 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. Moreover, the so-called engine room ER does not necessarily have to be provided without the above-mentioned partition wall, partition wall, firewall, etc., and the above-mentioned partition wall, partition wall, firewall, etc. are appropriately provided as necessary.

Further, as shown in FIG. 1, an intercooler IC, which is provided as needed, is provided in front of the first cooling fan 52 provided on the front side of the engine 8, and the intercooler IC and the engine 8 are provided. The arrangement position of the first cooling fan 52 that also serves as the cooling is not limited to the above position, and may be arranged substantially horizontally above the engine 8 although not shown, and the engine 8 and the hydraulic pump 26 may be arranged. You may make it arrange | position on the back side.

When the intercooler IC is installed, the air cleaner AC is installed on the upper side of the engine 8 as shown in FIG.
00 is connected to a turbocharger 102, which is a supercharger, and the air supercharged by the turbocharger 102 is connected to an intercooler IC through an air outlet 27a and an air pipe 104.

Further, as shown in FIG. 1, the hydraulic motor 52a, which is the drive means 51 of the first cooling fan 52, is connected to the hydraulic pump 26 driven by the engine 8 in the hydraulic line 26a.
The first cooling fan 52 is attached to the output shaft of the hydraulic motor 52a. In addition, the radiator 40, the oil cooler 50, and the second for cooling these
The driving means 501 of the cooling fan 53 is separately arranged outside the engine 8 or the engine room ER as shown in FIG.

Further, in the case of this embodiment shown in FIG.
One of a hydraulic oil tank 30 and a fuel tank 31 for hydraulic oil is provided in front of a counterweight 27 provided at the rear of the construction machine at a central side portion 1c between the one side portion 1a and the other side portion 1b. Tank (the hydraulic oil tank 30 in the present embodiment) is provided, and the other tank (fuel tank 31 in the present embodiment) is provided with a counterweight 27 provided in the rear part of the operator room 15 and the rear part of the construction machine. Is disposed in a rectangular parallelepiped shape along the front-rear direction on the left side of the one side portion 1a.

The upper portion of the other tank (fuel tank 31 in this embodiment) has an intake port 46 for cooling air provided on the left side surface of the construction machine as shown in FIGS.
The central side portion 1c of the above construction machine from (also referred to as a side opening)
The cover 31 has an inclined surface 31a so as to rise toward an outlet 47 (also referred to as an upper opening) of the cooling air provided in the cover FC on the upper side.

The inclined surface 31a of the upper surface of the fuel tank 31, which faces the cooling air flow by the second cooling fan 53, causes the cooling air flow to the discharge port 47 as shown in FIGS. It is formed so as to be guided, and in the case of the present embodiment, it is configured by an inclined surface that goes upward from the side of the upper revolving superstructure 2. However, the present invention is not limited to this, and the cooling air of the exhaust port 47 It may be guided in the direction, for example, may have a shape such as a flat surface 30c or a curved surface 30b as shown by a chain double-dashed line in FIG. 2, or may be formed as a separate member from the fuel tank 31.

Further, the inclined surface 31a on the upper portion of the fuel tank 31
As shown in FIG. 1, the oil cooler 50 and the radiator 40 are disposed above the above, but in the case of the present embodiment, the oil cooler 50 and the radiator 40 are arranged in the front-rear direction of the hydraulic excavator. It is arranged so that it may be parallel along. A second cooling fan 53 and a hydraulic motor 52a, which is a driving means 501 for the second cooling fan 53, are provided between the oil cooler 50, the radiator 40 and the fuel tank 31, respectively, as shown in FIG. ing.

Although not shown, for example, at the position of the one side portion 1a shown in FIG. 1, one of the oil cooler 50 and the radiator 40 may be superposed on the other in the vehicle width direction. Well, in this case, the radiator 40 is arranged on the downstream side of the cooling air with respect to the oil cooler 50, and the second cooling fan 53 and the hydraulic motor 52a for driving the second cooling fan 53 are sufficient for one unit, and the cost is reduced. it can.

The fuel tank 31 disposed below the oil cooler 50 and the radiator 40 does not have to be in this position, and only the oil cooler 50 and the radiator 40 are shown in FIGS. You may make it arrange | position in the above-mentioned position. Further, although not shown, the second cooling fan 53
The driving means 501 may be operated via a transmission mechanism such as a belt and a pulley which is interlocked with the engine 8.

The present embodiment is not limited to the one shown in FIGS. 1 and 2, but the oil cooler 50 and the radiator 4 may be provided in a portion such as a modification shown in FIGS. 3 and 4, for example.
0 may be provided, and in these modified examples, the portions substantially the same as those in the above-described embodiment are denoted by the same reference numerals, and the portions different from the above-described embodiment will be described.
That is, in the case of the modification shown in FIG. 3, the oil cooler 50 and the radiator 40 are arranged so as to face the front surface of the counterweight 27 and to be parallel in the vehicle width w direction of the construction machine,
The oil cooler 50, the two second cooling fans 53 for cooling each of the radiators 40, and the driving means 501 for driving each of the second cooling fans 53 are provided.

In the above embodiment, the case where the two second cooling fans 53 and the driving means 501 for driving each of the second cooling fans 53 are provided has been described. However, it is set by, for example, a small machine or design specifications. If the above cooling capacity can be secured, for example, the one second cooling fan 53 and the driving means 501 can be provided between the oil cooler 50 and the radiator 40 to achieve downsizing and cost reduction.

Further, as shown in FIG. 3, the counterweight 27 is provided with a through hole 46k for taking in or discharging cooling air penetrating in the front-rear direction, and the radiator 40 and the control valve 70 are connected in series in the front-rear direction of the construction machine. It is provided to be. Therefore, as shown in FIG. 3, the cooling air is taken in from the intake port (outer side opening) 46 of at least one of the side direction 46a, the front direction 46b, and the front upper direction 46c of the construction machine. 50, after cooling the radiator 40, at least one of a through hole 46k provided so as to penetrate the counterweight 27 in the front-rear direction or an inclined surface 27K provided so as to incline from the front surface of the counterweight 27 to the upper rear portion. Since the air is discharged from one discharge port (rear opening) 47, the flow resistance of the cooling air is reduced, and it is possible to obtain substantially the same operational effects as the above embodiment.

In the case of the other modification shown in FIG. 4, the hydraulic oil tank 30 and the fuel tank 31 are arranged in parallel in the vehicle width w direction of the construction machine so as to face the front surface of the counterweight 27. , Hydraulic oil tank 30, fuel tank 31
The oil cooler 50 and the radiator 40 are arranged so as to face the front surface of the oil cooler 50 and the radiator 4.
Two second cooling fans 53 for cooling each corresponding to 0
And the driving means 501 for driving the respective second cooling fans 53, the oil cooler 50 and the radiator 40 are cooled, and then the both tanks 3 are cooled.
Above, for example, the inclined surfaces 30b and 31b above 0 and 31
Further, the counterweight 27 smoothly flows through the curved surface 27K that is inclined from the lower front surface toward the rear upper surface, the flow resistance is reduced, and the cooling efficiency is improved, so that substantially the same operational effects as the above embodiment can be achieved. it can.

As shown in FIG. 1, the cooling fans 52,
The drive means 51, 501 of 53 are the above-mentioned hydraulic motors 52.
Instead of a, the second cooling fan 53 may be attached to the output shaft of the electric motor 52d that is operated by the power supplied from the power feeder SK driven by the engine 8. Further, in the hydraulic circuit including the hydraulic pipe 26a and the like, the control means S for controlling the rotation speed of the hydraulic motor 52a controlled by the controller CR.
1, the ambient temperature sensor T in the engine room ER
1 and the supercooled air temperature sensor T2 for detecting the temperature of the intercooler IC, the temperature detection signal from at least one of the temperature sensors is input to the controller CR to operate the control means S1 and respond to the temperature detection signal. Then, the hydraulic motor 52a of the first cooling fan 52 is operated to cool the engine room ER, the engine 8, the hydraulic pump 26, the intercooler IC, etc. accurately and efficiently, while suppressing noise. can do.

Although not shown, for example, when the hydraulic motor 52a is a constant displacement type hydraulic motor, the control means S1 comprises a flow rate control valve in the hydraulic circuit OP or an axial piston type which is a variable displacement hydraulic motor. In the case of the swash plate type hydraulic motor, the swash plate hydraulic motor is constituted by a variable displacement mechanism of the swash plate which controls the rotational speed of the hydraulic motor by changing the angle of the swash plate.

In the case of the above electric motor 52d,
For example, as shown in FIG. 1, the electric circuit EP is provided with a control means S2 for controlling a current and an electric resistance and is configured to control the amount of current to the electric motor 52d.
As in the case of 2a, since the rotation speed of the electric motor 52d can be controlled according to the temperature detected by at least one of the temperature sensors T1 and T2, the hydraulic motor 52a can be controlled. The same effect as that of the case can be obtained.

The temperature detected by the ambient temperature sensor T1 in the engine room ER is the engine room ER.
Temperature of the engine 8, the hydraulic pump 26, the engine exhaust, and the like, and the temperature locally rises in the engine room ER, for example, a plurality of parts such as the turbocharger part and the cooling air staying part. If the ambient temperature sensor T1 is provided at a location, the engine room E
The R, the engine 8, the hydraulic pump 26, etc. can be effectively cooled.

Further, the supercharged air temperature sensor T of the intercooler
The temperature detected by 2 is the temperature of the air flowing through the intercooler IC or the temperature of the cooling air after cooling the intercooler IC, and at least one of these temperatures is applied. is there. Also, the second cooling fan 5 for cooling the oil cooler 50 and the radiator 40
The driving means 501 of No. 3 is the first cooling fan 52 of the engine room ER, the engine 8 or the intercooler IC.
In the same manner as the rotation speed control of No. 3, the oil temperature sensor T3 that detects the oil temperature of the oil of the oil cooler 50, the cooling water temperature sensor T4 that detects the cooling water temperature of the radiator 40, the oil cooler 50, the radiator 40, or the like is passed. It is possible to accurately and efficiently cool the oil cooler 50, the radiator 40, etc. by detecting and inputting at least one temperature of the cooling air temperature sensors T5, T6, etc. for detecting the temperature of the cooling air later. Further, in the case of the electric motor 52d instead of the hydraulic motor 52a, for example, as shown in FIG. 1, the control means S2 for controlling the electric current and electric resistance provided in the electric circuit EP is connected to the hydraulic motor 52a. Similarly to the case, the output signal output according to the temperature detected by at least one of the temperature sensors T3 to T6 is input to the control means S2 via the control CR, and the electric motor 52d. Since the number of rotations of the oil cooler 50 is controlled, as in the case of the hydraulic motor 52a,
The radiator 40 and the like can be cooled accurately and efficiently.

Further, in the present embodiment, the intercooler IC, the radiator 40, the oil cooler 50, the first and second cooling fans 52 and 53, and the driving means 5 for driving the cooling fans.
1, 501, the hydraulic pump 26, the hydraulic motor 52a, the electric motor 52d, the power feeder SK, etc. are called a cooling device. Since the present embodiment is configured as described above, FIG.
When the engine 8 is operated as shown in FIG. 5, the cooling air is supplied to the inside of the engine room ER by the arrow Y by the first cooling fan 52.
As described above, cools the engine 8, the hydraulic pump 26, etc., and is provided on the rear wall of the engine room ER, or the exhaust port 407b provided on the upper surface of the engine hood EF of the engine 8. It is discharged from 407a.

Therefore, the engine room ER is the engine 8
Even in the case of an enclosure that surrounds the entire circumference of the engine 8 (for example, the six sides of the engine) or a firewall for soundproofing, the inside of the engine room ER can be effectively cooled. Since the first cooling fan 52 for the intercooler IC can also be used as the cooling fan for the engine room ER, it can be made compact as a whole and can be manufactured at low cost.

At this time, when the intercooler IC is provided, the cooling air which has cooled the intercooler IC only cools the compressed air taken in through the air cleaner AC in the turbocharger 102, so that the oil of the conventional example is used. It has a much lower temperature than the cooling air after cooling the cooler 50 and the radiator 40, and cools the engine room ER, the engine 8, and the hydraulic pump 26 with the cooling air at this low temperature. Therefore, these can be efficiently cooled.

Further, as shown in FIGS. 1 and 2, since the oil cooler 50 and the radiator 40 are separately arranged above the inclined surfaces 31a, 31b, 31c of the upper portion of the fuel tank, the air pressure loss is reduced. Reduced, oil cooler 50
Since fresh air can be effectively supplied to the radiator 40 and the radiator 40, respectively, size reduction and noise reduction can be achieved. Further, a condenser for a relatively low temperature air conditioner is arranged on the side of the intercooler IC, the engine room ER, or the oil cooler 50 and the radiator 40 separately arranged, and the first or second cooling fan 52 is provided together with the cooling machine or the like. , 53, it is possible to obtain substantially the same effects as the above embodiment.

Further, by separating the oil cooler 50 and the radiator 40 outside the engine room ER and separately placing them, the length of the upper revolving structure 2 in the front-rear direction can be made shorter than in the conventional case. The turning radius becomes smaller,
There is an advantage that the area of the working range can be expanded. When the hydraulic motor 52a, the electric motor 52d, or the like is applied to the driving means 501 of the second cooling fan 53 for cooling the oil cooler 50 and the radiator 40, the horsepower consumption of the cooling fan 53 increases, but the oil Cooler 50, radiator 4
0 and the like can be cooled accurately and efficiently while suppressing noise.

Further, the first cooling fan 52, shown in FIG.
The position where the drive means 51 is disposed is maintained at the current position, and the engine 8 and the hydraulic pump 26 that are vertically installed are arranged in the reverse direction of the position shown in FIG. Even if it is arranged so as to face the rear side, substantially the same operational effects as those of the above-described embodiment can be obtained. Further, in the above embodiment, the cooling fan is described as a suction type, but the cooling fan is not limited to this, and the cooling fan may have at least one function of suction and discharge, That is, it is possible to provide a cooling fan for both suction and discharge, or two cooling fans of a suction type fan and a discharge type fan.

Further, the cooling fan can be arbitrarily set according to design specifications, and when it has both functions of suction and discharge of the cooling fan, the cooling fan is appropriately arranged in the suction direction or the discharge direction. It is possible to improve the cooling efficiency by alternately rotating the intercooler, the oil cooler and the radiator to automatically clean the clogging of the core of the radiator and the dirt of the cooling flow passage.

Further, in the above-described embodiment, the cooling air is taken in through the inlet (outer side opening) 46 on the left side of the construction machine, and the outlet (rear side opening) 4 provided in the upper cover FC.
Although it is designed to be discharged from 7, the rear side opening (discharge port) 4
Intake of the cooling air from 7 to open the outside (intake) 4
Even if it is discharged from 6, it is possible to obtain substantially the same operational effects as the above-described embodiment.

Further, although the air-cooling intercooler is used as the intercooler IC in the above embodiment, a water-cooling intercooler can be applied. Substantially the same operational effects can be achieved.
That is, cooling water is cooled by a radiator for a water-cooled intercooler connected to a water pump of the engine 8 (not shown), and this cooling water is caused to flow to an intercooler core (not shown) to cool the supercharged air from the turbocharger 102. By supplying it to the intake manifold, it is possible to improve the performance such as the output of the engine 8.

In addition to the above, the exhaust pipe 8a of the engine 8 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 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.

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.

[0067]

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 engine room is provided on one side of the front end of the construction machine in the front-rear direction, and the engine is installed vertically on the other side of the opposite side of the one side in the front-rear direction along the operator room. A first cooling fan for cooling the engine and a driving means for driving the first cooling fan are provided, and a counterweight provided at a rear portion of the construction machine, the operator room, and the engine are provided. The engine and the oil cooler provided in a separate place during made is space, the radiator
The center side portion between the one side portion and the other side portion.
In front of the unta weight, the hydraulic oil tank for the above hydraulic oil and
One of the fuel tanks of the above engine
And the other tank at the rear of the operator room.
Configure the upper part of either of the above tanks
Above the substantially horizontal or inclined surface, the above oil cooler and radiator
A second cooling fan for cooling the oil cooler and the radiator and a second cooling fan for cooling the oil cooler and the radiator, which are installed substantially vertically and in parallel .
Since the driving means for driving the cooling fan is provided,
Since the engine, the hydraulic pump and the like can be effectively cooled by the cooling air sucked by the cooling fan, the noise can be reduced by lowering the rotation speed of the cooling fan.

Since the first cooling fan is a cooling fan for the engine room, it can be made compact as a whole, the cost is low, and the radius of rotation of the hydraulic excavator can be reduced, so that its action range is expanded. There are advantages such as being able to. Further, since the oil cooler and the radiator are separately installed separately from the engine and the space is provided with the oil cooler and the radiator in a substantially upright manner, cooling air independently flows into the oil cooler and the radiator, respectively, and cooling efficiency is improved. Since the temperature rises, it is possible to reduce the heat radiation area in front of the cores of the oil cooler and the radiator, reduce the rotation of the cooling fan, and reduce noise.
Further, the second cooling fan opposes the cooling air flow.
The above-mentioned substantially horizontal surface or inclined surface allows the cooling air flow to
Formed to have a guide surface that guides to the outlet
Therefore, the flow of the cooling air in the cooling air flow passage
It reduces the through resistance and can increase the above cooling effect.
It In addition, the fresh air can be taken in efficiently.
Therefore, the above-mentioned cooling of the oil cooler and radiator is possible.
In addition to improving the efficiency, the fresh shwe
Can cool the tank,
Reduce the heat dissipation area on the front of the core of the cooler and radiator,
The rotation speed of the cooling fan can be reduced and noise is reduced.
can do.

According to the cooling device for a construction machine of the second 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 as the traveling device, working device, etc. of the construction machine. In a cooling device for a construction machine, the front end of the construction machine in the front-rear direction is provided with an oil cooler that cools the high-temperature hydraulic oil that is transmitted to and returned to the construction machine, and a radiator that cools the cooling water of the engine. An engine room is provided on one side of the engine, and the engine is installed longitudinally along the operator room on the other side opposite to the one room, and a first cooling for cooling the engine. A driving means for driving the fan and the first cooling fan is provided, and the engine is separately provided between the rear portion of the operator room and the counterweight provided at the rear portion of the construction machine on the one side. The above oil cooler provided,
Has a radiator, the center between the above one side and the other side
Operation of the hydraulic oil in front of the counterweight at the side
Either of the oil tank or the fuel tank of the above engine
One tank is provided and the other tank is used by the operator
Provided at the rear of the chamber, above either tank
Above the substantially horizontal surface or inclined surface that constitutes the part.
Since the cooler and the radiator are provided substantially upright and in parallel, and the second cooling fan for cooling the oil cooler and the radiator and the driving means for driving the second cooling fan are provided, the effect of the first aspect is provided. The cooling air, which is the outside air, can be directly sucked into and discharged from the construction machine to improve the cooling performance. Also, the cooling air flow by the second cooling fan
The substantially horizontal surface or inclined surface facing the
Formed to have a guide surface that guides the flow to the outlet.
Therefore, the cooling in the cooling air flow passage
The flow resistance of air is reduced and the above cooling effect is increased.
You can In addition, the fresh air can be taken in efficiently.
The oil cooler and radiator
In addition to improving the cooling efficiency,
Reshair can cool the tank above
The heat dissipation area on the front of the core of the oil cooler and radiator is small.
The number of rotations of the cooling fan can be reduced
The sound can be reduced.

According to the cooling device for a construction machine of the third aspect of the present invention, in the construction of the first or second aspect , the high-pressure hydraulic oil from the hydraulic pump driven by the engine mounted on the construction machine is supplied. A cooling device for a construction machine including an oil cooler that cools the high-temperature working oil that returns 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. In the above-mentioned engine, an operator room is provided on one side of a front end of the construction machine in the front-rear direction, and the engine is installed vertically on the other side opposite to the one side in the front-rear direction along the operator room. And a first cooling fan for cooling the engine and a drive means for driving the first cooling fan, and a counter provided on the one side at the rear of the operator room and at the rear of the construction machine. A second cooling for cooling the oil cooler and the radiator, which is provided separately from the engine and is installed substantially in series with the engine in parallel with the vehicle width direction of the construction machine. Since the drive means for driving the fan and the second cooling fan is provided, the control valve can be effectively cooled in addition to the effect of the first or second aspect.

According to the cooling apparatus for a construction machine of the present invention as set forth in claim 4, in the structure of claim 3, the above is arranged so as to face the front surface of the counterweight and be arranged in parallel in the vehicle width direction of the construction machine. An oil cooler and a radiator are provided, a second cooling fan that cools the oil cooler and the radiator, and a drive unit that drives the second cooling fan are provided, and the oil cooler and the radiator are provided in front of the operator chamber and the counterweight. In addition to the effect of claim 3, the hydraulic oil tank and the fuel tank are provided between the driving means of the second cooling fan and in the longitudinal direction of the construction machine. And the second by the fuel tank
The rotation noise of the cooling fan is blocked, and the noise in the operator room can be reduced.

According to a fifth aspect of the cooling apparatus for a construction machine of the present invention, in the structure according to the third aspect, the above-mentioned structure is arranged so as to face the front surface of the counterweight and be parallel to the vehicle width direction of the construction machine. Providing a hydraulic oil tank and a fuel tank,
Further, the oil cooler and the radiator are provided so as to face the front surfaces of the hydraulic oil tank and the fuel tank in parallel with each other in the vehicle width direction, and the second cooling fan and the second cooling for cooling the oil cooler and the radiator are provided. Since the drive means for driving the fan is provided, in addition to the effect of claim 3 , it becomes easy to take in the cooling air from the side direction or the front direction of the construction machine, thereby increasing the cooling effect. You can

[0073]

[0074]

According to the cooling device for a construction machine of the present invention as set forth in claim 6, in the structure as set forth in claim 1 or 2 , the oil cooler and the radiator are arranged substantially upright on the upper portion of the other tank. Since it is installed in parallel in the front-back direction of the machine, the fresh air can be directly taken into each of the oil cooler and the radiator.
The cooling efficiency of the above oil cooler and radiator can be improved.

Further, the fresh air directly taken in can directly cool the other tank, and
It is possible to reduce the heat radiation area on the front surface of the core of the oil cooler and the radiator, reduce the rotation of the cooling fan, and reduce the noise. According to the cooling device for a construction machine of the present invention described in claim 7, in the configuration of claim 4 or 5, at least one of the two tanks is arranged below the second cooling fan. Or, since the both tanks are arranged in parallel so as to correspond to the lower side of the second cooling fan, the above-mentioned claim 4
In addition to the effect of 5 or 5, the efficiency of taking in the cooling air can be improved and the cooling effect of the tank can be increased.

According to the eighth aspect of the cooling apparatus for a construction machine of the present invention, in the configuration according to any of the first to third aspects, an operator room is provided at one side of the front end portion of the construction machine in the front-rear direction. And the engine room for accommodating the engine vertically connected to the hydraulic pump is disposed on the other side opposite to the one side portion, so that the first cooling fan can be downsized, or Since the cooling effect can be obtained at a low rotation speed of the cooling fan, noise can be suppressed.

According to a ninth aspect of the cooling apparatus for a construction machine of the present invention, in the configuration according to any one of the first to eighth aspects, the front side, the upper side, the rear side of the engine, the radiator, or the oil cooler is used. Since the intercooler of the engine provided so as to overlap with each other and the first cooling fan or the second cooling fan for cooling the intercooler are provided, the cooling fan for cooling the intercooler is provided in the engine room. Since it can be used also as the first cooling fan for cooling or as the second cooling fan for cooling the radiator or the oil cooler, the overall size can be reduced and the cost can be reduced.

According to the cooling apparatus for a construction machine of the tenth aspect of the present invention, in the structure according to any one of the first to ninth aspects, the cooling air for the oil cooler and the radiator is supplied to the side of the construction machine. Partial, frontal, or vertical direction intake (outer side opening) to intake, rear upper side direction or rearward direction at least one outlet provided (rear side opening) ), Or the cooling air is taken in through the rear side opening (exhaust port) and exhausted through the outer side opening (intake port). It is possible to effectively cool the oil cooler, the radiator and the other tank.

According to an eleventh aspect of the cooling device for a construction machine of the present invention, in the constitution according to any one of the first to tenth aspects, the driving means for the first and second cooling fans are hydraulic motors. Or, since it is driven by at least one of the electric motor or the engine,
There is a degree of freedom in design, and various cooling devices having high cooling efficiency can be manufactured according to design specifications.

According to the cooling apparatus for a construction machine of the present invention as set forth in claim 12, in the structure of claim 11, a hydraulic pressure for driving a hydraulic motor connected to the first cooling fan from a hydraulic pump by operating hydraulic pressure. Atmosphere for detecting the atmospheric temperature in the engine room by providing a control means for controlling the rotational speed of the hydraulic motor or the electric motor in the circuit or in an electric circuit for driving the electric motor connected to the first cooling fan. A temperature sensor and at least one temperature sensor of a supercharged air temperature sensor for detecting the supercharged air temperature of the intercooler of the engine, the temperature sensor and the control means are connected via a controller, The rotation speed of the hydraulic motor or electric motor is controlled by a command signal from the controller corresponding to the temperature detected by the temperature sensor. Since the temperature sensor detects the ambient temperature in the engine room or the supercharged air temperature of the intercooler by the temperature sensor, the command signal is output to control the rotational speed of the hydraulic motor or the electric motor. The engine room, engine, hydraulic pump, or intercooler can be cooled accurately and effectively.

According to a thirteenth aspect of the cooling apparatus for a construction machine of the present invention, in the constitution of the eleventh aspect or the twelfth aspect, the hydraulic motor connected to the second cooling fan is driven from the hydraulic pump by operating hydraulic pressure. A control means for controlling the rotational speed of the hydraulic motor or the electric motor is provided in the hydraulic circuit for driving the electric motor for driving the electric motor connected to the second cooling fan to control the temperature of the hydraulic oil of the oil cooler. At least one of a hydraulic oil temperature sensor for detecting, a cooling water temperature sensor for detecting the cooling water temperature of the radiator, a cooling air temperature sensor for detecting the temperature of the cooling air after passing through an oil cooler, a radiator, etc. It has two temperature sensors, and connects the temperature sensor and the control means through a controller to correspond to the temperature detected by the temperature sensor. Since the rotational speed of the hydraulic motor or the electric motor is controlled by the command signal from the controller, the temperature sensor detects the temperature of the oil cooler or radiator or the supercharged air temperature of the intercooler to detect the temperature. By outputting a command signal and controlling the rotation speed of the hydraulic motor or the electric motor, the temperatures of the oil cooler and the radiator or the intercooler can be cooled accurately and effectively.

According to a fourteenth aspect of the cooling device for a construction machine of the present invention, in the configuration of the eighth aspect , the exhaust outlet end portion of the exhaust pipe of the engine disposed in the engine room, and at least the exhaust gas. An ejector is provided, which is spaced apart from the outlet end and protrudes longer than the exhaust outlet end and is provided in a partition wall forming the engine room. Since the heated air 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 explanatory view showing a state similar to that of FIG.

FIG. 2 is a schematic explanatory view showing a cross section taken along line 2A-2A of FIG.

FIG. 3 is an explanatory diagram showing a modified example of the embodiment of the present invention shown in FIG.

FIG. 4 is an explanatory diagram showing another modified example of the embodiment of the present invention shown in FIG.

5 is a schematic explanatory view showing an application example of the above-described embodiment and showing a view A in FIG. 1. FIG.

FIG. 6 is a schematic overall perspective view of a conventional hydraulic excavator.

FIG. 7 is a schematic explanatory view showing a plan view of FIG.

[Explanation of symbols]

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 26a hydraulic piping 30 hydraulic oil tank 31 Fuel tank 33 storage boxes 40 radiator 46 Intake of cooling air 47 Cooling air outlet 50 oil cooler 51 First Cooling Fan Driving Means 501 driving means for second cooling fan 52 First cooling fan 53 Second cooling fan 102 Supercharger (Turbocharger) AC air cleaner CR controller EP electric circuit ER engine room M muffler M1 exhaust outlet end M2 suction tube M3 suction gap OP hydraulic circuit SK power feeder S1, S2 control means ER engine room EP electric circuit OP hydraulic circuit SK power feeder S1, S2 control means

   ─────────────────────────────────────────────────── ─── Continued front page       (56) Reference JP-A-10-47058 (JP, A)                 JP-A-8-277713 (JP, A)                 Actual Kaihei 2-54726 (JP, U)                 Actual development Sho 64-41620 (JP, U)                 62-65317 (JP, U)                 59-78130 (JP, U)

Claims (9)

(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 the front end of the construction machine in the front-rear direction, and the one side is provided. On the other side opposite to the above, the engine vertically installed along the operator room in the front-rear direction, the first cooling fan for cooling the engine, and the drive means for driving the first cooling fan are provided. The oil cooler provided separately from the engine between a counterweight provided at the rear of the construction machine, a space formed by the operator room and the engine, It has a radiator and one side of the above
The front of the counterweight at the center side between the other side
The operating oil tank for the operating oil is installed in the
Above the one side provided between the chamber and the counterweight
Install a fuel tank for the engine,
Above the above-mentioned substantially horizontal surface or inclined surface,
A cooling device for a construction machine, wherein a radiator and a radiator are provided substantially upright and in parallel, and a second cooling fan for cooling the oil cooler and the radiator and a driving means for driving the second cooling fan are provided. . 2. The both tanks are provided below the second cooling fan.
Whether at least one of the tanks is installed,
Both the tanks are attached so as to correspond to the lower side of the second cooling fan.
2. The ridges are arranged in parallel.
Cooling device for the construction machine described. 3. One side of the front end of the construction machine in the front-rear direction.
Section has an operator room, and on the other side opposite the above one side
The above engine connected to the above hydraulic pump can be installed vertically.
A contractor characterized by having an engine room for delivery
The cooling device for a construction machine according to claim 1 or 2. 4. The front side or the upper side or the rear side of the engine or
Or polymerize with the above radiator or oil cooler.
And an intercooler for the engine provided in the
The first cooling fan or the second cooling fan for cooling the cooler
A cooling fan is provided, and the cooling fan is provided.
Cooling device for the construction machine described. 5. Cooling of the oil cooler and radiator described above
Air is directed to the side, front, and up and down of the above construction machine.
At least one of the intakes (outer side opening)
At least either in the rear upper direction or the rear direction
From the discharge port (rear side opening) provided in one direction
Either discharge it, or use the rear side opening (discharge port) above
Take in the cooling air and discharge it through the outer opening (inlet).
5. The structure according to any one of claims 1 to 4, characterized in that
A cooling device for a construction machine described therein . 6. A driver of the first and second cooling fans.
Each stage is a hydraulic motor or an electric motor or the above engine.
Drive by at least one of the
Construction according to any one of claims 1 to 5, characterized in that
Mechanical cooling system. 7. A hydraulic pressure connected to the first cooling fan.
Hydraulic pressure that drives the motor with the hydraulic pressure from the hydraulic pump
Drive an electric motor in the circuit or connected to the first cooling fan
In the moving electric circuit, the hydraulic motor or electric motor
The engine is provided with a control means for controlling the rotational speed of the engine.
Atmosphere temperature sensor that detects the ambient temperature in the room and
Detects the supercharged air temperature of the above engine intercooler
At least one of the supercharged air temperature sensors
A temperature sensor, and the temperature sensor and the control means
The temperature detected by the above temperature sensor is connected through the controller.
Depending on the command signal from the controller corresponding to the
To control the rotation speed of the hydraulic motor or electric motor
The cooling of the construction machine according to claim 6, characterized in that
Rejection device. 8. A hydraulic pressure connected to the second cooling fan.
Hydraulic pressure that drives the motor with the hydraulic pressure from the hydraulic pump
Drive an electric motor in the circuit or connected to the second cooling fan
In the moving electric circuit, the hydraulic motor or electric motor
A control means for controlling the rotation speed of the motor is provided to
Oil temperature sensor for detecting the temperature of hydraulic oil
Cooling water temperature sensor to detect the cooling water temperature of the radiator,
The above cooling after passing through the oil cooler and radiator
Few of the cooling air temperature sensors that detect the temperature of the air
It has at least one temperature sensor,
Connect the controller to the control means via a controller,
Is the controller compatible with the temperature detected by the temperature sensor ?
Command signal from the above hydraulic motor or electric motor
The invention is characterized in that the number of revolutions is controlled.
The cooling device for a construction machine according to 6 or 7. 9. The engine installed in the engine room.
The exhaust outlet end of the engine exhaust pipe and at least the above exhaust
Projects longer than the exhaust outlet end with a gap from the outlet end
In addition to the
Exhaust of the above engine equipped with an ejector consisting of a pull pipe
Use the pressure to suck in the heated air in the engine room and
It is configured to be discharged to a section.
3. A cooling device for a construction machine according to item 3.