JP2000170207A - Cooling device for construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve cooling performance, and decrease noise of a refrigerator, a cooling fan and an engine by effectively cooling an engine system and an oil pressure system mutually. SOLUTION: An engine room ER for closely surrounding a transverse engine 8 is arranged on a front side of a counter weight 27 of a construction machine. At least either one first cooler 100a of coolers 100 such as an oil cooler 50, a radiator 40, and an inter-cooler 1c, a first cooling fan 52, and a first driving means 52a(52d) are provided on a side part of an engine room ER and a forward part of the counter weight 27 in an outside of the engine room. Furthermore, a second cooler 100b other than the first cooler 100a, a second cooling fan 53, and a second driving means 52a(52d) are arranged on a forward part of the other side part 1b of the construction machine. Accordingly, it is possible to increase intake of cooling air, and improve view on a forward side of the other side part 1b of the construction machine.

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 a wheel loader such as a hydraulic shovel or bulldozer, a construction machine such as 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 shovels, bulldozers, wheel loaders, and track type loaders are known.
It is used for excavating rocks such as dams, tunnels, rivers, and roads in mountainous areas, and for breaking down buildings and buildings. Extremely high atmospheric temperatures under the scorching sun. Under the conditions, the construction machine is often forced to operate continuously so as not to be overloaded at the output of the maximum capacity limit.

The structure of the construction machine is, for example, a hydraulic excavator. The basic structure of the hydraulic excavator is, as shown in FIGS. 6 and 7, an upper revolving unit 2 for revolvingly supporting the upper revolving unit 2 as shown in FIGS. It comprises three parts of a lower traveling body 4 provided on the lower side of the body 2 and a working device 6 provided on the upper rotating body 2 for performing various operations. And
The upper revolving unit 2 includes an engine 8, a hydraulic device (not shown), a revolving device 12, an operator room 15, and the like. The lower traveling unit 4 has a car body 16, a track roller frame 18, a traveling device 20, and other components not shown. The working device 6 further includes a boom 24 and an arm 25 for supporting the bucket 22, and various hydraulic cylinders and link rods for operating the same.

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. 6 and 7, the upper revolving unit 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 pump from the hydraulic pump 26. The actuator driven by pressure oil, for example,
A boom cylinder 24a for rotating the boom 24, a control valve 70 for controlling the flow of hydraulic oil supplied from a hydraulic pump 26 to an actuator such as the boom cylinder 24a, and a hydraulic pipe for connecting the control valve 70 to the boom cylinder 24a. Hydraulic pipes 73a and 74a for connecting the 73, 74 and control valve 70 with other actuators not shown, a fuel tank 31 for supplying fuel to the engine 8, and a hydraulic oil for storing hydraulic oil supplied to the hydraulic pump 26 A tank 30, a hydraulic pipe 76 connecting the hydraulic oil tank 30 to the hydraulic pump 26, a delivery hose 78 connecting the hydraulic pump 26 and the control valve 70, and a pipe 75 connecting the control valve 70 and the oil cooler 50. And oil cooler 5
It has a hydraulic pipe 77 connecting the hydraulic oil tank 30 and the hydraulic oil tank 30, and further has a storage box 33 and an operator room 15.

The hydraulic oil discharged from the hydraulic pump 26 driven by the engine 8 is controlled by a control valve 70 and transmitted to the above-described devices to perform various operations to become low-pressure oil.
And returns to the hydraulic oil tank 30 via the hydraulic pump 2 again.
6 for circulation. Further, as shown in FIG. 7, a turbocharger 102 provided above the engine 8 is connected to an intercooler IC via an air pipe 104.
To the air pipe 1 from the intercooler IC.
06, it is connected to an intake manifold of the engine 8, and further connected to an air cleaner AC via an air pipe 104a.

Further, during operation of the construction machine, the hydraulic pump 26 is controlled so as to output the maximum capacity in response to an operation of an operator, and is continuously operated in a limit area where the construction machine is not overloaded. Often runs all day. Therefore, while circulating the hydraulic oil from the hydraulic pump 26 and returning to the oil cooler 50 side, heat generated by pressure loss in the hydraulic circuit, heat generated when pressure oil is released from the relief valve, The oil temperature continues to rise little by little due to heat generated by the sliding friction of each actuator.

[0007] As a result, if 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 the above, there is a possibility that deterioration of a seal or the like of a joint portion or a fitting portion of each part (not shown) or deterioration of lubricating oil performance may cause seizure of a rotating portion.

Therefore, the work is performed as described above, and the returned hydraulic oil is distributed 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. Cooling is performed by a hydraulic oil cooler (hereinafter, referred to as an oil cooler) 50 provided, the hydraulic oil is returned to the hydraulic oil tank 30, and the oil circulates through the above-described path again.

The engine is disposed laterally with respect to the front-rear direction of the upper revolving unit 2. The cooling device of the hydraulic shovel is mounted on the front side of the engine 8 as shown in FIG. If an intercooler IC for a supercharger of the engine 8 is provided in front of the cooling fan 52 driven by the
0, the radiator 40 is arranged in series, but the above-mentioned intercooler IC is usually arranged on the windward side of the cooling air.

[0010] Downstream of the intercooler IC, the oil cooler 50, the radiator 40, and other cooling machines, and the cooling fan 52 for cooling the cooling machine, extend along the counter weight 27 provided at the rear of the hydraulic excavator. The engine 8 and the hydraulic pump 26 are surrounded by a front side partition wall Wb and a counter weight 27, and a rear partition wall Wc connecting the front side partition wall Wb and the counter weight 27, and an upper portion thereof is an engine hood. EF or cover EC
It is configured to be covered with.

A left side of the enclosed construction machine is open, and a cooler 100 is provided in front of the open end opening OS. Cooling air taken in by the cooling fan 52 and cooling the cooler is provided. After the engine 8 and the hydraulic pump 26 are further cooled, they are discharged from a discharge port 47 provided in the engine hood EF, the rear partition Wc, and the like.

Another conventional example is disclosed in Japanese Unexamined Patent Publication No.
The technology described in Japanese Patent Application Publication No. 72-72 is, although not shown, arranges the engine horizontally in an engine room of an upper revolving structure, 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 that cools and an intercooler that cools air supplied by a turbocharger, wherein the oil cooler and the radiator are driven by the engine in the engine room that houses the engine. The oil cooler and the radiator are disposed in series in front of a fan, and the intercooler is separately disposed outside the engine room, and the oil cooler and the radiator are eliminated by eliminating the intercooler disposed in the engine room. The heat radiation area on the front of the core is smaller than before, making it easier to manufacture a heat exchanger. Bet is one that was made to be cheaper.

[0013]

However, any of the techniques described in Japanese Patent Application Laid-Open No. 9-125972 discloses a cooling fan for cooling at least one of the oil coolers, radiators, intercoolers and the like. Is driven by the above engine,
Since the number of revolutions of the cooling fan depends on the number of revolutions of the engine, cooling water, hydraulic oil,
Even when the temperature of the supercharged air is low, the rotational speed of the cooling fan increases when the rotational speed of the engine is high, and there is a possibility that the temperature of the cooling medium cannot be appropriately controlled, such as being supercooled.

In the conventional technique shown in FIG. 7 described above, the cooling machine is disposed in the open end opening OS of the engine room ER or the like in front of the cooling fan 52 mounted on the engine 8. Therefore, it is necessary to discharge a large amount of cooling air fluid that is forcibly sucked by the cooling fan 52 from the engine room ER to the outside. In the configuration of the engine room ER, since the open end opening OS and the exhaust port 47 are open to the outside, noise generated from the engine 8 is also easily leaked to the outside of the engine room ER.
A quiet hydraulic excavator with low noise level cannot be obtained.

An oil cooler 5 for the working oil of the working oil
0 is disposed on the front surface of the cooling water radiator 40 of the engine 8 so as to be superposed in series with the cooling fan 52 of the radiator 40, and therefore passes through the oil cooler 50 to cool the high-temperature hydraulic oil. The cooling air thus obtained has a considerably high temperature, and may have a reduced cooling capacity when passing through the radiator 40.

The present invention has been made in view of these problems, and an engine room that hermetically surrounds a horizontal engine mounted on a construction machine is disposed in front of a counterway of the construction machine. At least one of an oil cooler, a radiator, and an intercooler outside the engine room, a first cooling fan for cooling the cooler, and a first drive unit for driving the first cooling fan are provided on the construction machine. At least one of the oil cooler, the radiator, and the intercooler is provided in front of the counterweight on one side of the engine room and in front of the other side of the construction machine. A second cooling fan for cooling and second driving means for driving the second cooling fan are provided so that the intake of the cooling air can be increased. Both an object to provide a cooling system for a construction machine which is adapted other side in front of the field of view of the construction machine can be improved.

[0017]

According to the first aspect of the present invention, there is provided a cooling apparatus for a construction machine according to the present invention, wherein high-pressure hydraulic oil from a hydraulic pump driven by an engine mounted on the construction machine is supplied to the construction machine. And a radiator that cools the engine coolant and an oil cooler that cools the high-temperature working oil that is returned to the traveling device and the working device. An operator room is disposed on one side of a front end of the machine in the front-rear direction, and is disposed along a vehicle width direction of the construction machine between a counter weight provided at a rear portion of the construction machine and the operator room. The engine connected to the hydraulic pump is disposed horizontally in the engine room to be operated, and the engine is connected to a side of the engine room and a front side of the counter weight behind the operator room. A first cooling fan that is at least one of an intercooler, an oil cooler, and a radiator of the engine disposed at one position, and that cools the first cooling fan; The first driving means for driving the first cooling fan is disposed so as to be overlapped substantially horizontally in the vertical direction, and the first cooling means is at least one of the intercooler, the oil cooler, and the radiator. A second cooling fan for cooling a second cooling machine other than the cooling machine, and a second cooling fan for driving the second cooling fan.
The driving means is disposed at the second position on the other side opposite to the one side so as to overlap the driving means substantially vertically in the vertical direction.

According to a second aspect of the present invention, there is provided a cooling device for a construction machine according to the first aspect of the present invention, wherein the first cooling device is disposed between the first position and the operator room. One of a hydraulic oil tank and a fuel tank mounted on a construction machine is disposed, and the operation is performed between the second position where the second cooler is disposed and the engine room. It is characterized in that one of the oil tank and the fuel tank is disposed.

According to a third aspect of the present invention, there is provided a cooling apparatus for a construction machine according to the first or second aspect, wherein the cooling air taken in by the first cooling fan flows outside the front partition of the engine room. A suction hole communicating with the inside and outside of the engine room is provided along a wall surface, and suction means for sucking heated air in the engine room by the cooling air flowing through the outer wall surface and discharging the heated air to the outside is 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, further comprising a soundproof shielding plate provided so as to face the suction hole with a space therebetween. And According to a fifth aspect of the present invention, there is provided a cooling device for a construction machine according to any one of the first to fourth aspects, further comprising a noise suppression unit at an intake port of the engine room.

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 to third aspects, wherein the front partition of the engine room is opposed to the first cooling device. And the outer wall surface of the one tank facing the cooling air from the first cooling fan of the first cooler disposed at the first position and the second wall disposed at the second position. (2) At least one of the outer wall surfaces of the other tank facing the cooling air from the cooling fan is formed of a guide surface for guiding the cooling air toward the first cooler. It is characterized by:

According to a seventh aspect of the present invention, there is provided a cooling device for a construction machine according to any one of the first to third and sixth aspects, wherein the first or second driving means is a hydraulic motor,
It is characterized in that it is configured to be driven by an electric motor or any of the above engines. The cooling device for a construction machine according to the present invention as described in claim 8 is the seventh embodiment.
In the configuration described above, in a hydraulic circuit for driving a hydraulic motor connected to the first cooling fan by operating hydraulic pressure from a hydraulic pump or in an electric circuit for driving an electric motor connected to the first cooling fan. Provided with control means for controlling the rotation speed of the hydraulic motor or the electric motor,
At least one of an ambient temperature sensor for detecting an ambient temperature in the engine or the engine room and a high-temperature section temperature sensor for detecting a temperature of a portion where the temperature in the engine room rises; One of a refrigerant temperature sensor for detecting the temperature of the refrigerant of the first cooler disposed at one position and a cooling air temperature sensor for detecting the temperature of the cooling air after cooling the first cooler. One of the temperature sensors, wherein the temperature sensor and the control means are connected via a controller, and the first cooling fan is connected to the first cooling fan by a command signal corresponding to a temperature detected by the temperature sensor. The rotation speed of the hydraulic motor or the electric motor is controlled.

According to a ninth aspect of the present invention, there is provided a cooling device for a construction machine according to the seventh or eighth aspect, wherein
In the hydraulic circuit for driving the hydraulic motor connected to the cooling fan by operating hydraulic pressure from a hydraulic pump or in the electric circuit for driving the electric motor connected to the second cooling fan, the hydraulic motor or A controller for controlling the number of revolutions of the electric motor, a refrigerant temperature sensor of the second cooler for detecting the temperature of the second cooler disposed at the second position, and the second cooler A cooling air temperature sensor for detecting a temperature of cooling air after cooling the temperature sensor, and connecting the temperature sensor and the control means via the controller to the temperature sensor. The rotation speed of the hydraulic motor or the electric motor of the second cooling fan is controlled by a command signal from the controller corresponding to the detected temperature of the second cooling fan. It is set to.

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 third and sixth to ninth aspects, wherein an exhaust pipe of an engine disposed in the engine room is provided. An exhaust outlet end, and an ejector comprising a suction pipe provided at a partition wall constituting the engine room while protruding longer than the exhaust outlet end at least apart from the exhaust outlet end. It is characterized in that the heated air in the engine room is sucked and discharged to the outside by using the exhaust pressure.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 shows an embodiment of the present invention, and is a schematic plan view showing a case where a cooling device for a construction machine of the present invention is applied to a hydraulic shovel, and FIG.
FIG. 3 is a schematic explanatory view showing a cross section taken along line 2A, and FIG.
FIG. 4 is a schematic explanatory view showing a cross section taken along line -3A, and FIG.
FIG. 5 is a schematic explanatory view showing a cross section taken along line A-4A, and FIG. 5 is a modified example of the present embodiment, and is a schematic explanatory view showing a portion corresponding to the arrow A in FIG. 1.

As shown in FIGS. 1 to 4, high-pressure hydraulic oil from a hydraulic pump 26 driven by an engine 8 mounted on the construction machine is transmitted to the traveling unit 20, the working unit 6 and the like of the construction machine. At least, an oil cooler 50 for cooling the returned high-temperature hydraulic oil and a radiator 40 for cooling the cooling water of the engine 8 are provided. And
The vehicle width of the construction machine is between an operator room 15 disposed on one side 1a of the front end of the construction machine in the front-rear direction and a counter weight 27 provided at the rear of the construction machine. In the engine room ER arranged along the direction, the engine 8 to which the hydraulic pump 26 is connected
Are arranged horizontally.

The engine room ER is provided with a front partition W provided in front of the engine 8 as shown in FIGS.
a, a counterweight 27 provided at the rear of the excavator, a front side partition Wfb extending at an interval from the counterweight 27, and a right end of the counterweight 27 from a right end of the front side partition Wfb. And a rear partition wall Wc extending to the rear.

Further, the front partition Wa, the counter weight 2
7. A so-called enclosure, which is formed in a substantially sealed state by a bottom partition Wd that covers the lower surface of the periphery surrounded by the front side partition Wfb and the rear partition Wc, and an upper partition We that covers the upper side of the periphery. Engine room E
The engine 8 and the hydraulic pump 26 are disposed in the R.

The rear side partition Wrb on the counter weight 27 side can also be used as the front face of the counter weight 27 as in this embodiment. 1 and 2
As shown in the above, in the front partition Wa of the engine room ER,
A shield plate 103 for preventing noise from leaking from the engine 8 or the like is provided so as to face the suction hole 101 communicating the inside and outside of the engine room ER, and an isolation wall for separating the engine 8 from the hydraulic pump 26 as necessary. FW is provided.

When the partition wall FW is provided, a pump chamber in which the hydraulic pump 26 is surrounded by the partition wall FW, the front partition Wa, the rear partition Wc, and the like is formed. Ventilation is performed by a discharge port 47 appropriately provided in the rear partition Wc, the engine hood EF, or the like. Further, the bottom partition Wd of the engine room ER determines whether or not to be adopted according to design specifications, and may not be used.

Also, as shown in FIG.
At the first position P1 on the left side of R and behind the counterweight 27 behind the operator room 15, at least one of the intercooler IC for the supercharger of the engine 8, the oil cooler 50, and the cooler 100 of the radiator 40. In this embodiment, an intercooler I is provided.
C, a radiator 40 is provided as the first cooler 100a.

As shown in FIG. 1, the intercooler IC, the first cooling fan 52 for cooling the first cooler 100a of the radiator 40, and the first driving means 51 for driving the first cooling fan 52 are substantially omitted. They are arranged so that they overlap horizontally in the vertical direction. Then, at least one of the intercooler IC, the oil cooler 50, and the cooler 100 of the radiator 40, which is disposed at the second position P2 on the front side of the other side portion 1b of the upper revolving structure 2, is the second. Although provided as the cooler 100b, in the present embodiment, an oil cooler 50 is provided, and a second fan 53 for cooling the second cooler 100b and a second drive for driving the second cooling fan 53 are provided. The means 501 and the means 501 are disposed so as to be superposed substantially horizontally in the vertical direction.

As shown in FIGS. 1 and 2, the first position P
The cooling air of the first cooler 100a disposed in the first revolving unit 1 is supplied to an inlet 46 provided in a side wall of one side 1a of the upper swing body 2.
a, an intake 4 provided below the first cooler 100a
6b, at least one of the inlets 46c provided to penetrate the counterweight 27 in the front-rear direction, and is provided so as to be taken in from this inlet.

Any one of the hydraulic oil tank 30 and the fuel tank 31 is provided between the operator room 15 and the first position P1 of the one side portion 1a where the first cooler 100a is disposed. One of the tanks 31 (or 30) is disposed, and the other side 1b on which the second cooler 100b is disposed.
The other one of the hydraulic oil tank 30 and the fuel tank 31 (or 31) is disposed between the second position P2 and the engine room ER.

As shown in FIG. 1, a space formed between the hydraulic oil tank 30, the fuel tank 31 and the front side partition Wfb is provided with hydraulic oil from the hydraulic pump 26 and various devices. A control valve 70 for controlling the flow of the returning hydraulic oil is provided. Next, the cooling air intakes 46a to 46c will be described. The front partition Wa is a part of the cooling air taken in from the cooling air intake 46a as shown in FIGS. Constitutes a guide surface 120 that is deflected upward and flows.

As shown in FIGS. 1 and 2, the cooling air enters the intake port 46a through the first cooling fan 52 and flows as indicated by arrows Y and Ya.
0a is cooled and flows in the direction of arrow Y.
As shown in FIG. 1, the first cooling device 100a is deflected upward along the guiding surface 120 of the front partition Wa shown by the solid line in FIG. 2 and flows as shown by the arrow Y1, cools the first cooler 100a, and is provided on the cover EC. It is discharged from the discharge port 47.

Further, as shown by a two-dot chain line in FIGS. 1 and 2, a part of the cooling air taken in from the cooling air inlet 46a is deflected upward, as shown by the two-dot chain line in FIG. The deflection front partition wall GWa having a guide surface 120a formed of, for example, an inclined surface, a curved surface, or the like so as to easily flow into the cooler 100a.
The cooling air taken in from the inlet 46a is deflected upward by the guide surface 120a, and cools the first cooler 100a as shown by the arrow Y1 to flow upward.

The shape and size of the front deflection wall GWa may be appropriately set and provided. In the case of the present embodiment shown by a two-dot chain line in FIG. GWa
2 has two guiding surfaces 120a.
The cooling air taken in from the lower inlet 46b is
As shown in FIG. 2 and FIG. 3, the air flows in as indicated by an arrow Yb, cools the cooler 100a, and is discharged from an outlet 47 provided in the cover EC above the first cooler 100a.

As shown by a two-dot chain line in FIG. 3, a deflection side surface 3 for guiding the cooling air, which is formed of an inclined surface, a curved surface, or the like, toward the first cooler 100a on the side surface of the fuel tank 31.
When 1b is provided, it is configured to be deflected by the deflecting side surface 31b and flow as shown by an arrow Y1.
The cooling air taken in from the rear inlet 46c is:
As shown in FIG. 3, it is taken in as indicated by arrows Y and Yc, flows in the directions of arrows Y and Y1, and is discharged from the outlet 47 described above.
Part of the fuel tank 31 deflects in the direction of arrow Y1 on the deflecting side surface 31a which is the side surface indicated by the solid line, and is discharged from the discharge port 47.

Further, suction communicating with the inside and outside of the engine room ER to a negative pressure region generated by the cooling air flowing along the outer wall surfaces of the front partition Wa, the deflection front partition GWa, and the deflection side surfaces 31a and 31b. A hole 101 is provided, and the cooling air flowing through the outer wall surface sucks heated air in the engine room, and is configured to obtain a pump function like a jet pump that discharges the air outside through the suction hole 101. Suction means is provided.

As shown in FIGS. 1 and 4, the second
In the oil cooler 50 that is the second cooler 100b disposed at the position P2, the intake 4
6A, lower inlet 46B and left and right inlets 46
The cooling air sucked from the second cooling fan 53 from at least one of the inlets C and 46D is at least one of the directions indicated by arrows YA to YD as shown in FIGS. The oil cooler 50 (second cooler 100b) is cooled by the cooling air taken in from the direction, flows as indicated by an arrow Y, and is discharged from the discharge port 47 described above.

Then, the intake 46 at the front of the construction machine
A and a part of the cooling air from the lower inlet 46B is deflected by the deflecting side surface 30a on the side of the fuel tank 30, flows in the direction of the arrow Y1, and is discharged from the outlet 47 provided in the upper cover EC. As shown by a two-dot chain line in FIGS. 1 and 4, a deflecting side surface 31b is provided on the side surface of the hydraulic oil tank 30 for guiding the cooling air having an inclined surface, a curved surface, and the like toward the second cooler 100b. In this case, a part of the cooling air is effectively deflected by the deflecting side surface 30b to cool the second cooler 100b and to flow as indicated by an arrow Y1.

As shown in FIG. 1, the hydraulic motor 52a connected to the first cooling fan 52 is
Control for controlling the rotation speed of the hydraulic motor 52a or the electric motor 52d in the hydraulic circuit OP for driving with the operating hydraulic pressure from Step 6 or the electric circuit EP for driving the electric motor 52d connected to the first cooling fan 52. Means S1,
S2 is provided.

Then, the engine 8 or the engine room E
An atmosphere temperature sensor T1 for detecting an atmosphere temperature in the R, a high temperature section temperature sensor T2 for detecting a temperature of a portion where the temperature in the engine room ER rises, and the first cooler 100a disposed at the first position P1. And a cooling air temperature sensor T4 for detecting the temperature of the cooling air after cooling the first cooler 100a. The temperature sensor and control means S1, S2
Are connected via a controller CR, and the number of rotations of the hydraulic motor 52a or the electric motor 52d of the first cooling fan 52 is controlled by a command signal from the controller CR corresponding to the temperature detected by the temperature sensor. The room ER and the first cooler 100a can be appropriately cooled as required. The ambient temperature sensor T1 and the high-temperature section temperature sensor T2 may include at least one of these temperature sensors, and the refrigerant temperature sensor T3 and the cooling air temperature sensor T4 also include at least one of them. At least one of the temperature sensors may be provided.

Further, the hydraulic motor 52a connected to the second cooling fan 53 is driven by the operating oil pressure from the hydraulic pump 26, or the electric motor 52d connected to the second cooling fan 53 is driven. Electric circuit E
During P, the hydraulic motor 52a or the electric motor 52d
Are provided with control means S1 and S2 for controlling the number of rotations.

Then, a refrigerant temperature sensor T for detecting the temperature of the other cooler 100b disposed at the second position P2.
5 and a cooling air temperature sensor T6 for detecting the temperature of the cooling air after cooling the other cooler 100b, and the controller C
R via the hydraulic motor 52a or the electric motor 52 of the second cooling fan 53 according to a command signal from the controller CR corresponding to the temperature detected by the temperature sensor.
By controlling the number of rotations of d, the second cooler 100b can be appropriately cooled as required. The refrigerant temperature sensor T5 and the cooling air temperature sensor T6
May be provided with at least one of these temperature sensors.

The part where the temperature locally rises in the engine room ER is, for example, in the vicinity of the turbocharger 102, where the cooling air stays, the engine 8, the hydraulic pump 2
6. The engine room ER, the engine 8, the hydraulic pump 26, and the like can be effectively cooled by providing the high temperature section temperature sensors T2 at a plurality of locations, such as the engine exhaust system, at a plurality of locations. .

Since the present embodiment is configured as described above, the first cooler 100a provided at the first position P1 of the one side portion 1a is provided with the side cooler as shown in FIGS. The cooling air taken in by the first cooling fan 52 from at least one of the inlets 46a, 46b, 46c of the parts from at least one of the directions of the arrows Ya, Yb, Yc is supplied to the intercooler IC, the radiator 40. And is discharged smoothly from the discharge port 47.

That is, a part of the cooling air taken in from the inlet 46a as described above is used for the front partition Wa, the deflection front partition GWa, and the deflection side surfaces 31a and 31b shown in FIGS.
Is deflected along the outer wall surface of the guide surface, and flows smoothly and rapidly as shown by arrows Y and Y1, and a negative pressure region is generated on the outer wall surface. The heated air is sucked to the outside through the suction hole 101 and discharged from the exhaust port 47.

Also, an arrow Yc is drawn from the rear inlet 46c.
The cooling air taken in as shown in FIG.
The cooling device 100a is cooled by the deflecting side surface 31a of the side surface of the fuel tank 31 in the direction of the arrow Y1 as shown by a two-dot chain line in FIG. 3 to effectively cool the first cooling device 100a. It is discharged from the discharge port 47. In addition, the first
Cooling air taken in from the inlet 46b provided below the first cooler 100a at the position P1 is also taken in as shown by the arrow Yb, flows upward from below and is discharged from the outlet 47, so that the cooling means By the pump action like the jet pump, like the case of the intake 46a, the first
Of the cooler 100a and the engine room ER can be effectively cooled.

The oil cooler 50 of the second cooler 100b disposed on the other side 1b of the upper revolving unit 2 has the structure shown in FIG.
As shown in FIG. 4, the cooling of the oil cooler 50, which is the second cooler 100b disposed at the second position P2, is performed by the inlet 46A in front of the upper swing body 2 and the inlet 46B below. And the second cooling fan 5 from at least one of the left and right intakes 46C and 46D.
3, cooling air is taken in from at least one of the arrows YA to YD, cools the oil cooler 50, flows as indicated by the arrow Y, and a part of the cooling air is supplied to the hydraulic oil tank 30. Deflection side 3 of side
The oil cooler 50 (second cooler 100b) can be efficiently cooled by being deflected by Oa and flowing in the direction of the arrow Y1 and being discharged from the discharge port 47 provided in the cover EC.

The second cooler 10 at the second position P1
0b from the inlet 46B provided below the
Since it is taken in from the direction of the arrow YB, flows upward from below and is discharged from the discharge port 47, the second cooler 100b can be cooled effectively. Also, the first cooling fan 52
Heated air is sucked out by the cooling air, and the engine room ER is covered with a louver R provided on the bottom partition wall Wd of the engine room ER and closed on the upstream side of the cooling air as shown in FIG. The outside air is supplied from the intake port R1 and the heated air in the engine room ER is ventilated, the engine 8 and the engine room ER are efficiently cooled, and the engine is controlled by the engine room ER defined by the partition walls W. 8. Since noise leakage from the hydraulic pump 26 and the like is prevented, a quiet hydraulic excavator can be provided. Since the noise does not leak directly to the outside by the shield plate 103, the noise can be prevented.

Further, since the exhaust of the engine 8 is directly exhausted to the outside of the engine room via the muffler M by the exhaust pipe 8a extending outside the engine room ER, the temperature of the engine room ER rises due to the exhaust of the engine 8. Can be prevented. In the present embodiment, the first cooler 100 including the intercooler IC and the radiator 40 is located at the first position P1.
The first cooler 100a may be any one of the intercooler IC, the radiator 40, and the oil cooler 50. For example, when the first cooler 100a is an intercooler IC, the cooling capacity is small. Therefore, the fluid resistance of the cooling air is smaller than that of the above-described embodiment, and the amount of cooling air and the flow velocity taken into the first cooling fan 52 are increased, so that the negative pressure in the negative pressure region is increased. As a result, the pumping action of the suction means increases, and the ventilation of the heated air in the engine room ER can be improved.

Although not shown, the above-mentioned cooler can efficiently cool a condenser of an air conditioner and the like by appropriately combining the first and second coolers as described above. Also, with the above configuration, the engine room ER, the first cooler 100a, and the second cooler 100
b can be appropriately and effectively cooled as required. Further, even if the horizontal engine described in the present embodiment is disposed in the left-right reverse direction, substantially the same operation and effect as in the above-described embodiment can be obtained.

Further, in addition to the above, a muffler M is disposed in an exhaust pipe 8a of the engine 8 in the exhaust system of the engine 8 as in another modification of the embodiment shown in FIG.
The heated air in the engine room ER is supplied to a part of the upper partition wall We (or the engine hood EF) of the engine room ER in which the outlet of the muffler M is disposed by using the engine exhaust pressure discharged to the outside. If an ejector EJ composed of an outer pipe and an inner pipe, which will be described later and is sucked and discharged to the outside, is provided, the engine room ER, the engine 8 and the like can be more effectively cooled to improve the cooling efficiency.

The engine 8 is a turbocharger 1 which is a supercharger provided as necessary as shown in FIG.
02 is connected, and the air supercharged by the turbocharger 102 is supplied to the air outlet 2 of the turbocharger 102.
The supercharged fluid supplied to the intercooler IC via the pipe 104 through the pipe 7a and cooled is supplied from the supply port 27b of the intake pipe of the engine 8.

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

The above-mentioned ejector EJ is provided with a plurality of slit-shaped intake ports R1 as necessary in the bottom partition wall Wd of the engine room ER located on the opposite side via the air passage EY in the engine room ER. By promoting the ventilation in the engine room ER, the cooling efficiency can be improved. The intake ports R1 each include louvers R as noise suppression means NS for suppressing leakage of engine noise to the outside of the engine room ER, and these louvers R are formed by cutting and raising from the respective intake ports R1. ing.

Further, although not shown, the noise suppressing means NS has a noise reduction 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. Also, an exhaust pipe 8a provided in the engine 8
, A negative pressure is generated around the engine exhaust flow ejected from the exhaust outlet end M1 of the engine, and the suction gap M3 becomes a negative pressure. The negative pressure causes the air in the engine room ER to be sucked together with heat. It can be forcibly discharged outside the machine.

[0060]

As described above in detail, according to the cooling apparatus for a construction machine according to the first aspect of the present invention, the high-pressure hydraulic oil from the hydraulic pump driven by the engine mounted on the construction machine is used. A cooling device for a construction machine, comprising: an oil cooler that cools the high-temperature working oil that is transmitted back to a traveling device, a working device, and the like of the construction machine and returns, and a radiator that cools cooling water of the engine. An operator room is arranged on one side of the front end in the front-rear direction of the construction machine, and between the counter weight provided at the rear of the construction machine and the operator room along the vehicle width direction of the construction machine. The engine to which the hydraulic pump is connected is disposed horizontally in an engine room to be disposed, and the front side of the counter weight behind the operator room on the side of the engine room. A first cooling fan provided at a first position, the first cooling fan being at least one of an intercooler, an oil cooler, and a radiator of the engine, and a first cooling fan for cooling the first cooler; The first driving means for driving the first cooling fan is disposed so as to overlap substantially horizontally in the vertical direction, and the first cooling means is at least one of the intercooler, the oil cooler, and the radiator. A second cooling fan for cooling a second cooling machine other than the cooling machine of the second type and a second cooling fan for driving the second cooling fan.
And the driving means are arranged at the second position on the other side opposite to the one side so as to overlap the driving means substantially horizontally in the vertical direction.
Since the engine is isolated from the other parts of the construction machine, the operating noise of the engine does not leak to the outside, so that the construction machine can be made quieter and disposed at the first position. The cooling air for cooling the first cooling machine is directly taken in outside air from at least one of the lateral, lower and rear inlets of the construction machine, and after cooling the cooling machine, it is directly moved upward. The cooling efficiency can be improved because of the discharge.

In addition, a second cooling fan and a second driving means for driving the second cooling fan are horizontally disposed in front of the second cooling machine disposed at the second position and the other side of the construction machine. With such a configuration, the outside air can be directly taken in from at least one of the inlets provided in the front, left, right, and lower directions of the second cooler, so that the cooling efficiency of the second cooler is improved. I can do it.

Further, the second cooling machine, the second cooling fan and the second drive means thereof, which are arranged at the second position in front of the other side of the construction machine, can be arranged substantially horizontally low. ,
The visibility of the right front and right sides of the construction machine which is away from the operator is improved, and the workability is improved. Claim 2
According to the cooling device for a construction machine of the present invention described in claim 1,
In the configuration described above, any one of a hydraulic oil tank and a fuel tank mounted on the construction machine is disposed between the first position where the first cooler is disposed and the operator room. And the other of the hydraulic oil tank and the fuel tank is disposed between the second position where the second cooler is disposed and the engine room. In addition to the effect of item 1, the first
The noise generated from the first cooling fan, which cools the first cooler disposed at the position, and the first driving means thereof is cut off by any one of the tanks and the engine room. Noise can be reduced.

Further, since the first and second coolers are dispersedly arranged at the first position and the second position, the coolers passing through the respective coolers are arranged. The thickness of the core can be reduced, the flow resistance of the cooling air is reduced, and effective cooling can be performed. According to the cooling device for a construction machine of the present invention described in claim 3, in the configuration according to claim 1 or 2, the outer wall surface of the front partition wall of the engine room through which the cooling air taken in by the first cooling fan flows. A suction hole communicating with the inside and outside of the engine room along the air passage, and a suction means for sucking heated air in the engine room by the cooling air flowing through the outer wall surface and discharging the heated air to the outside. In addition to the effect of 2, the cooling air flow that cools the first cooler generates a negative pressure area on the outer wall surface of the front partition, and the heated air in the engine room by the jet pump-like pump action. , And the heated air generated in the engine room can be effectively discharged to the outside.

According to the cooling device for a construction machine according to the fourth aspect of the present invention, in the configuration according to the third aspect, a soundproof shielding plate is provided so as to face the suction hole with an interval. In addition to the effect of the third aspect, when the heated air in the engine room is sucked outside through a suction hole by the pump action like the jet pump, the noise of the engine or the like is shielded by the soundproof shielding plate. Therefore, leakage of noise to the outside can be reduced.

According to the cooling device for a construction machine according to the fifth aspect of the present invention, in the configuration according to any one of the first to fourth aspects, a noise suppressing means is provided at an intake port of the engine room. In addition to the effects of any one of the above, the noise in the engine room can be prevented from leaking out of the engine room by the noise suppressing means.

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 to third aspects of the present invention, wherein: An outer wall surface of the one of the tanks facing the cooling air from the first cooling fan of the first cooling tree disposed at the first position and the second cooling tree disposed at the second position; Since at least one of the outer wall surfaces of the other tank facing the cooling air from the cooling fan is formed of a guide surface for guiding the cooling air toward the first cooler. In addition to the effect of any one of claims 1 to 3, the cooling air rapidly and smoothly flows along the outer wall surface to promote the generation of a negative pressure near the outer wall surface. Effective pumping action Ukoto can effectively perform the suction of heated air in the engine room can be improved cooling of the ventilation and the engine.

According to the cooling device for a construction machine according to the present invention, in the construction according to any one of the first to third and sixth aspects, the first and second driving means are a hydraulic motor,
Since it is configured to be driven by any one of the electric motor and the engine, in addition to the effects of any one of claims 1 to 3, it can be appropriately selected according to design specifications and can be selected at design time. There is a degree of freedom.

According to an eighth aspect of the present invention, in the cooling device for a construction machine according to the present invention, in the configuration of the seventh aspect, a hydraulic circuit for driving the hydraulic motor connected to the first cooling fan from a 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 inside or in an electric circuit for driving the electric motor connected to the first cooling fan, and an ambient temperature in the engine or the engine room is provided. And at least one of a high-temperature section temperature sensor for detecting the temperature of a portion where the temperature in the engine room rises, and the first temperature sensor disposed at the first position. And a cooling air temperature sensor for detecting the temperature of the cooling air after cooling the first cooling machine. And a one temperature sensor of, connected via a controller and the temperature sensor and the control unit, the first by a command signal from the controller corresponding to the detected temperature of the temperature sensor
Since the number of rotations of the hydraulic motor or the electric motor of the cooling fan is controlled, in addition to the effect of claim 7, the first cooling fan is controlled by a command signal from the controller corresponding to the temperatures detected by the two temperature sensors. In order to control the rotation speed of the hydraulic motor or the electric motor, the engine room ER and the first cooler can be appropriately and effectively cooled as required.

According to a ninth aspect of the present invention, in the construction machine cooling device according to the seventh or eighth aspect, the hydraulic motor connected to the second cooling fan is operated by operating hydraulic pressure from the hydraulic pump. In the hydraulic circuit for driving or in the electric circuit for driving the electric motor connected to the second cooling fan, control means for controlling the number of rotations of the hydraulic motor or the electric motor is provided, and the second position is controlled. Detecting the temperature of the second cooler disposed in the second
Having at least one of a cooling air temperature sensor for detecting the temperature of the cooling air after cooling the refrigerant temperature sensor of the cooler and the second cooler,
The temperature sensor and the control means are connected via the controller, and the rotation speed of the hydraulic motor or the electric motor of the second cooling fan is controlled by a command signal from the controller corresponding to the temperature detected by the temperature sensor. Since the control is performed, in addition to the effects of claim 7 or claim 8, the second control signal is output from the controller according to the detected temperature detected by the at least one temperature sensor.
By controlling the number of rotations of the hydraulic motor or the electric motor of the cooling fan, the second cooler can be appropriately cooled as required.

According to the cooling apparatus for a construction machine according to the present invention, in the construction according to any one of the first to third, sixth, and ninth aspects, the engine disposed in the engine room is provided. An exhaust outlet end of an exhaust pipe, and an ejector comprising a suction pipe provided at a partition wall constituting the engine room while protruding longer than the exhaust outlet end at least apart from the exhaust outlet end. The configuration is such that the heated air in the engine room is sucked and discharged to the outside using the exhaust pressure of the engine, so that in addition to the effects of any of claims 1 to 3, 6 to 9, Each part in the engine room can be effectively cooled.

[Brief description of the drawings]

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

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

FIG. 3 is a schematic explanatory view showing a cross section along line 3A-3A in FIG. 1;

FIG. 4 is a schematic explanatory view showing a cross section taken along line 4A-4A in FIG. 1;

FIG. 5 is a schematic explanatory view showing a modification of the embodiment of FIG. 1 and showing a portion corresponding to an arrow A section of FIG. 1;

FIG. 6 is a schematic perspective view showing a conventional hydraulic excavator.

FIG. 7 is a schematic plan view showing the hydraulic shovel of FIG. 6 in a plan view.

[Explanation of symbols]

 2 Upper revolving unit 4 Lower traveling unit 6 Working device 8 Engine 12 Revolving device 15 Operator room 16 Car body 18 Track roller frame 20 Traveling device 22 Bucket 24 Boom 26 Hydraulic pump 30 Hydraulic oil tank 31 Fuel tank 33 Storage box 40 Radiator 46 Cooling Air intake 50 Oil cooler 51 First drive means 52 First cooling fan 53 Second cooling fan 70 Control valve 100a First cooler 100b Second cooler 501 Second drive means EC cover EF Engine hood EJ Ejector ER Engine room FW Separation wall IC Intercooler M Muffler M1 Exhaust outlet end M2 Intake pipe M3 Suction gap NS Noise suppression means R Louver R1 Intake port S1 Control means S2 Control means W Partition Wa Front partition W b front side partition wall Wrb rear side partition wall Wc rear bulkhead Wd bottom partition wall We upper partition

Claims (10)

[Claims] 1. A high-pressure hydraulic oil which is transmitted from a hydraulic pump driven by an engine mounted on a construction machine to a traveling device, a working device and the like of the construction machine and returns to the high-temperature hydraulic oil. A cooling machine for a construction machine, comprising: an oil cooler for cooling the engine; and a radiator for cooling the cooling water for the engine, wherein an operator room is provided at one side of a front end in the front-rear direction of the construction machine, The engine to which the hydraulic pump is connected is disposed horizontally in an engine room disposed along a vehicle width direction of the construction machine between a counter weight provided at a rear portion and the operator room. An intercooler, an oil cooler, and a radiator of the engine disposed at a first position on a side of the engine room and in front of the counterweight behind the operator room. A first cooling fan that cools the first cooling device, and a first driving unit that drives the first cooling fan. A second cooling unit that is disposed so as to be overlapped horizontally in a vertical direction, and cools a second cooling unit other than the first cooling unit, which is at least one of the intercooler, the oil cooler, and the radiator; A fan and a second driving means for driving the second cooling fan are arranged at a second position on the other side opposite to the one side so as to be substantially horizontally overlapped in a vertical direction. And cooling equipment for construction machinery. 2. The first cooling device according to claim 1, wherein the first cooling device is provided.
A second position where one of a hydraulic oil tank and a fuel tank mounted on the construction machine is disposed between the position and the operator room, and the second cooler is disposed; The cooling device for a construction machine according to claim 1, wherein one of the other of the hydraulic oil tank and the fuel tank is disposed between the engine room and the engine room. 3. A suction hole communicating with the inside and outside of the engine room along an outer wall surface of a front partition wall of the engine room through which the cooling air taken in by the first cooling fan flows, and the cooling air flowing through the outer wall surface is provided. 3. The cooling device for a construction machine according to claim 1, further comprising suction means for sucking heated air in the engine room by air and discharging the heated air to the outside. 4. The cooling device for a construction machine according to claim 3, further comprising a soundproof shielding plate provided so as to face the suction hole at an interval. 5. The cooling device for a construction machine according to claim 1, further comprising a noise suppression unit at an intake port of the engine room. 6. The cooling air from the first cooling fan of the first cooler disposed at the outer wall surface of the front partition wall of the engine room facing the first cooler and at the first position. The outer wall surface of the one tank facing the
And at least one of the outer wall surfaces of the other tank facing the cooling air from the second cooling fan and facing the first cooling air toward the first cooler. The cooling device for a construction machine according to any one of claims 1 to 3, wherein the cooling device is configured by a guide surface that guides the construction machine. 7. The apparatus according to claim 1, wherein the first or second driving means is configured to be driven by any one of a hydraulic motor, an electric motor, and the engine.
The cooling device for a construction machine according to claim 1. 8. A hydraulic circuit for driving a hydraulic motor connected to the first cooling fan by operating hydraulic pressure from a hydraulic pump or an electric circuit for driving an electric motor connected to the first cooling fan. A control unit for controlling the number of revolutions of the hydraulic motor or the electric motor, an ambient temperature sensor for detecting an ambient temperature in the engine or the engine room, and a temperature of a portion where the temperature in the engine room rises. At least one of the high-temperature section temperature sensors, a refrigerant temperature sensor that detects the temperature of the refrigerant of the first cooler disposed at the first position, and the first cooler. Having one of a cooling air temperature sensor for detecting a temperature of the cooling air after cooling, the temperature sensor and the control means, Are connected via a controller, and the rotation speed of the hydraulic motor or the electric motor of the first cooling fan is controlled by a command signal from the controller corresponding to the temperature detected by the temperature sensor. The cooling device for a construction machine according to claim 7, wherein 9. The electric circuit for driving a hydraulic motor connected to the second cooling fan by operating hydraulic pressure from the hydraulic pump in the hydraulic circuit or an electric motor for driving an electric motor connected to the second cooling fan. In the circuit, control means for controlling the number of revolutions of the hydraulic motor or the electric motor is provided, and the refrigerant of the second cooler for detecting the temperature of the second cooler disposed at the second position is provided. A temperature sensor and / or a cooling air temperature sensor for detecting a temperature of cooling air after cooling the second cooler; and a controller configured to control the temperature sensor and the control unit. And controls the rotation speed of the hydraulic motor or electric motor of the second cooling fan by a command signal from the controller corresponding to the temperature detected by the temperature sensor. Characterized by the fact that
The cooling device for a construction machine according to claim 7. 10. An exhaust outlet end of an exhaust pipe of an engine disposed in the engine room, and protruding longer than the exhaust outlet end at least with an interval between the exhaust outlet end and the engine room. An ejector comprising a suction pipe provided on a partition wall constituting the ejector, wherein the exhaust air of the engine is used to suck heated air in the engine room and discharge the heated air to the outside. The cooling device for a construction machine according to any one of Items 1 to 3, 6 to 9.