JP2000130161A - Cooling device of construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the reliability of a hydraulic equipment, improve the cooling performance of a cooling machine, cooling fan and engine and reduce the noise, by cooling an engine system and hydraulic system mutually and effectively, on a cooling device of a construction machine. SOLUTION: This cooling device is composed of an operator room 15 arranged on one side of the front end of front/rear direction of a construction machine, an engine 8 connected to a hydraulic pump 26 arranged sideway between a counter weight 27 provided on the rear part of the construction machine and the operator room 15, a radiator 40 arranged in front of the engine 8, a first cooling fan 52 for cooling the radiator 40, an oil cooler 50 arranged on the rear part of the operator room between the radiator 40 or the first cooling fan 52 and the operator room, a second cooling fan 53 for cooling the oil cooler 50, hydraulic oil tank 30 and fuel tank 31 provided on the other sides 1b of the opposite side of one side part 1a and arranged so as to face to the oil cooler 50, and an engine room consisting of a partition wall surrounding at least the engine 8 out of the radiator 40, the first cooling fan 52 and the engine 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art Construction machines such as hydraulic excavators, self-loaders, bulldozers, wheel loaders, and track-type loaders are known as:
As is well known, it is used for excavation of rocks such as dams, tunnels, rivers, and roads in mountainous areas, and for demolition of buildings and buildings.
Extremely high ambient temperature under the sun and harsh conditions such as the above-mentioned work site scaffolding and ground surface. Is often forced.

The construction machine will be described, for example, with respect to a hydraulic shovel. As shown in FIGS. 4 and 5, the basic structure of the hydraulic excavator includes an upper revolving structure 2 in which the upper body is pivotably formed, a lower traveling structure 4 provided below the upper revolving structure 2, and various operations. The revolving superstructure 2 includes an engine 8, a hydraulic device (not shown),
It comprises a turning device 12, an operator room 15, and the like, and comprises a side cover 2sc that covers the outer periphery of the upper turning body 2, an engine hood 11, and the like.

The lower traveling body 4 is composed of a car body 16, a track roller frame 18, a traveling device 20, and other components.
The working device 6 is composed of a boom 24 and an arm 25 for supporting the bucket 22, and various hydraulic cylinders and link rods for operating the same. 20 and the like.

The engine 8 is disposed horizontally between a counter weight 27 provided at the rear of the construction machine and the operator room 15, and an oil cooler 50 and a radiator 40 are provided from the front of the engine 8. , Cooling fan 52 in this order. Also, as shown in FIGS. 4 and 5, the oil cooler 50 is positioned from the front side of the construction machine.
A turning motor (not shown) is transmitted to the truck 28, and in the turning device 12, a turning motor (not shown) is turned and transmitted to the turning gear. Working.

Then, as shown in FIGS. 4 and 5, the flow of hydraulic oil supplied from the hydraulic pump 26 to the working devices 6 such as the boom 24, the arm 25, the traveling device 20, and the turning device 12 is controlled. A control valve 70 and a pipe 7 connecting the control valve 70 and the working device 6.
3, 74 and a fuel tank 3 for supplying fuel to the engine 8
1, a hydraulic oil tank 30 for storing the hydraulic oil sucked into the hydraulic pump 26, a supply pipe 76 connecting the hydraulic oil tank 30 and the hydraulic pump 26, and a hydraulic pump 26.
A delivery hose 78 connecting the oil cooler 50 to the control valve 70; an oil cooler pipe 75 connecting the control valve 70 to the oil cooler 50;
And a long oil cooler pipe 77 for connecting the oil cooler 30 with the hydraulic oil tank 30.

The radiator 40 or the oil cooler 50
Are provided on each side of the construction machine in the front-rear direction. Further, a front side partition Wfb is provided which is connected to bridge the front side in the front-rear direction of the rear partition Wc provided between the engine 8 and the hydraulic pump 26 and the partition plate W1. A rear side partition Wrb connected so as to bridge the rear side of the direction and the partition plate W2 is provided. In the present embodiment, the front side of the counter weight 27 also serves as the rear side partition Wrb. .

The engine room ER includes a radiator 40, partition walls W1 and W2, a rear partition Wc, a front partition Wfb, and a rear partition Wrf, as shown in FIG. As described above, the hydraulic pump 26 driven by the engine 8 discharges, for example, about 5
The hydraulic oil pressurized to 0 to 140 kg / cm ² is controlled by the control valve 70 and transmitted to each of the above devices to become low-pressure oil, returns to the hydraulic oil tank 30 again via the control valve 70, and returns to the hydraulic pump. 26 circulates.

Further, the construction machine has a self-propelled ability, but in order to improve the traveling performance, the entire horsepower of the engine can always be converted to the hydraulic horsepower even if the discharge pressure changes due to a change in the load condition during traveling. It is something like that. Therefore, when the construction machine is in operation as described above, it often operates continuously throughout the day in a limit area where the construction machine is not overloaded.

Therefore, when the hydraulic oil is discharged from the hydraulic pump 26, the above operation is performed, and when the oil returns to the oil cooler 50 side, the temperature rises to a maximum of about 90 to 100 ° C., so that the oil is continuously used. Therefore, there is a possibility that the components of the hydraulic oil are destroyed due to the high temperature and the hydraulic oil is degraded, the seal of the hydraulic equipment is broken, and the hydraulic equipment is damaged.

On the other hand, as shown by arrows in FIGS. 4 and 5, the cooling air of the radiator 40 is supplied by a first cooling fan 52 to a cooling air inlet provided on the left upper surface of the engine hood 11 in the vehicle width direction. 46h, the air is sucked downward into the engine room ER, cools the radiator 40 and the engine 8, and then goes upward again to the outside of the engine room ER from a cooling air outlet 46k provided on the right upper surface of the engine hood 11. It is configured to be discharged upward.

Accordingly, the operation oil is returned as described above, and the returned hydraulic oil is superposed on the front surface of the cooling water radiator 40 of the engine 8 as shown in FIG. It is cooled by the cooler 50, returned to the hydraulic oil tank 30, and circulated again in the above-mentioned path.

[0013]

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

For this reason, since the cooling air which has passed through the oil cooler 50 and cooled the high-temperature hydraulic oil and has become considerably high temperature cools the radiator 40 again, the engine 8
The cooling capacity for the high-temperature engine cooling water that has cooled the engine has been reduced. The cooling air of the radiator 40 is
As shown by the arrows in FIGS.
As a result, the cooling air intake port 46h provided on the left upper surface in the vehicle width direction of the engine hood 11 is sucked downward into the engine room ER, cools the radiator 40 and the engine 8, and then goes upward again to the right. The hydraulic pump 26 is discharged from the cooling air outlet 46k provided on the upper surface to the right and outside the engine room ER, so that the hydraulic pump 26 is outside the engine room ER, and the cooling air from the cooling fan 52 It cannot be affected and depends on natural cooling, and it cannot be said that the above-mentioned high-temperature working oil is sufficiently cooled.

For this reason, when the surface area of the oil cooler 50 is increased to improve the cooling capacity, the effective cooling area through which the oil cooler 50 directly ventilates the radiator 40 is further reduced. The cooling capacity will be further reduced. Also, the hydraulic oil may be heated to a certain high temperature, but for example, hydraulic work of a hydraulic excavator must be performed even under the hot sun outdoors,
If the cooling efficiency of the oil cooler 50 is poor under bad conditions under hot weather, the hydraulic oil will be at an abnormally high temperature, and the hydraulic oil will be degraded, and the abrasion resistance and the like of the hydraulic oil will be destroyed. Since rubber products such as seals in the hydraulic equipment are destroyed, oil leaks and abnormal wear of the hydraulic pump and the hydraulic motor may cause damage to the hydraulic equipment such as the hydraulic pump and the hydraulic motor.

Further, the hydraulic oil component is destroyed, sludge (unnecessary sediment) is generated, and the valve may be clogged, resulting in malfunction. In the layout shown in FIG. 5, the cooling fan 52 is located immediately behind the operator room 15 and the oil cooler 50 and the radiator 40 overlap to increase the flow resistance. Therefore, the noise of the operator room 15 and the construction machine as a whole increases.

SUMMARY OF THE INVENTION The present invention has been made in view of these problems, and aims to improve the reliability of hydraulic equipment by effectively cooling an engine system and a hydraulic system mutually. An object of the present invention is to provide a cooling device for a construction machine that effectively cools both the tanks.

[0018]

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

According to a second aspect of the present invention, there is provided a cooling device for a construction machine according to the first aspect, wherein the engine room includes a rear partition provided between the engine and the hydraulic pump, and the radiator is constructed. A front side partition connecting the front side of the machine and the front side of the rear partition; and a rear side of the construction machine of the radiator and the rear side of the rear partition. And a rear-side partition connecting the two.

According to a third aspect of the present invention, there is provided a cooling device for a construction machine according to the first or second aspect, wherein the hydraulic oil tank and the fuel tank on the side facing the oil cooler or the second cooling fan are provided. A cooling air passage for cooling air from the second cooling fan that cools the hydraulic pump by a side surface of one of the tanks or a rear surface of the one tank and a front side partition wall that forms the engine room. It is characterized by being constituted.

According to a fourth aspect of the present invention, there is provided a cooling device for a construction machine according to the second or third aspect, wherein a front side partition wall of the engine room facing the side surface or the rear surface of the one tank is provided. It is characterized in that the outer surface is configured such that the cross-sectional area of the cooling air passage increases from upstream to downstream of the cooling air of the oil cooler.

According to a fifth aspect of the present invention, in the cooling device for a construction machine according to the third aspect of the present invention, the cooling air having cooled the oil cooler flows through the cooling air passage of the oil cooler. The cooling air discharged from a cooling air outlet provided on at least one of a side and an upper side of the hydraulic pump and cooled the radiator is provided above the engine room after cooling the engine. The cooling air outlet is configured to be discharged from the cooling air outlet.

According to a sixth aspect of the present invention, there is provided a cooling device for a construction machine according to the fifth aspect, wherein the side or rear surface of the one tank is provided between the operator room and the oil cooler. And a guide member provided so as to extend in the direction, and to guide the cooling air of the oil cooler to the hydraulic pump side.

According to a seventh aspect of the present invention, there is provided a cooling apparatus for a construction machine according to any one of the third, fourth, and fifth aspects, wherein the cooling device is arranged so as to be substantially parallel to the one tank and along the engine. Having the control valve disposed between the oil cooler provided and the one tank,
The cooling air passage of the oil cooler is characterized by the one tank, the guide member, the control valve, and the front side partition.

According to an eighth aspect of the present invention, there is provided a cooling device for a construction machine according to any one of the first to third aspects, wherein the driving means for the first and second cooling fans 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. According to a ninth aspect of the present invention, there is provided a cooling device for a construction machine according to any one of the first to third, fifth, sixth, and seventh aspects, wherein an intercooler for a supercharger provided in the engine is provided. It is characterized in that it is disposed so as to be superposed on either the radiator or the oil cooler.

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 seventh aspects, wherein the surface area of at least the side opposed to the second cooling fan or the oil cooler is provided. The hydraulic oil tank is characterized in that the hydraulic oil tank is configured to increase a surface area of the cooling air flowing from the second cooling fan.

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 third, fifth, and eighth 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. The heated air in the engine room is sucked and discharged to the outside using the exhaust pressure.

[0028]

Embodiments of the present invention will be described below with reference to 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 explanation showing a modification of the embodiment of FIG. FIG. 3 and FIG. 3 are schematic explanatory views showing other modified examples of the above embodiment.

In the construction machine described above, the upper traveling body 2 is pivotally mounted on the lower traveling body 4 shown in FIG. 4 as a conventional example, and is driven by an engine 8 mounted on the construction machine. The high-pressure hydraulic oil from the hydraulic pump 26 is transmitted to the traveling device 20, the working device 6, and the like of the construction machine, and the returned oil cooler 50 for cooling the high-temperature hydraulic oil and the cooling water for the engine 8 are cooled. A cooling device for a construction machine including a radiator 40 for cooling is provided.

The operator room 15 is disposed between the operator room 15 provided at one side of the front end 1a of the construction machine in the front-rear direction and the counter weight 27 provided at the rear of the construction machine. Hydraulic pump 26
Connected to the engine 8, a radiator 40 disposed in front of the engine 8, and a first radiator 40 for cooling the radiator 40.
A cooling fan 52 and a driving unit 52a for driving the first cooling fan 52 are provided. In the present embodiment, the first cooling fan 52 connects the engine 8 to the driving unit 52a.
It is designed to be driven as.

The radiator 40 or the first cooling fan 5
An oil cooler 50 is disposed at a rear portion of the operator room 15 between the second room 2 and the operator room 15, and a second cooling fan 53 having a driving unit 51 for cooling the oil cooler 50 is provided. A fuel tank 31 and a hydraulic oil tank 30 are arranged on the other side b opposite to the one side 1a in the front-rear direction of the construction machine.

A rear partition Wc is provided to separate the engine 8 from the hydraulic pump 26. Partition plates W1 and W2 are provided to extend in the front-rear direction from both sides of the radiator 40 in the front-rear direction of the construction machine. ing. And
The radiator 40, the front side partition Wfb extending from the side of the rear partition Wc in the front direction of the construction machine to the partition plate W1, and the rear partition Wc in the rear direction of the construction machine
Rear side partition Wr extending from the side of the partition to the partition plate W2
An engine room ER surrounding the first cooling fan and the engine 8 is provided by b and the rear partition Wc, and is configured so that high heat and noise from the radiator 40, the first cooling fan 52 and the engine 8 can be cut off as much as possible. ing.

The rear side partition Wrb also serves as the front surface of the counterweight 27 in the case of the present embodiment.
The driving means 52a for driving the first cooling fan 52 includes:
In the case of the present embodiment, the engine 8 is used,
It may be driven by a hydraulic motor or an electric motor.

As shown by a solid line in FIG. 1, the oil cooler 50 and the oil cooler 50 are provided between one of the hydraulic oil tank 30 and the fuel tank 31 and the oil cooler 50 in this embodiment. A control valve 70 for the hydraulic oil is provided between the tank 30 and the hydraulic oil tank 30 so as to be substantially parallel to the hydraulic oil tank 30, and forms a cooling air passage S1 in cooperation with the front side partition Wfb of the engine room ER. are doing.

Further, cooling air intake ports 46, 4 provided on the left side cover 2sc and the upper cover 2uc of the construction machine.
6h, the cooling air sucked by the second cooling fan 53 cools the oil cooler 50, flows through the cooling air passage S1, cools the control valve 70, further cools the hydraulic oil tank 30, and part of the hydraulic oil It flows through the cooling air passage S2 formed between the tank 30 and the front side partition Wfb, cools the hydraulic pump 26, and cools the cooling air outlet 46a provided on the side cover 2sc of the construction machine or the construction machine. Cooling air outlet 46b provided in upper cover 2uc
Is discharged from at least one of the cooling air outlets.

On the other hand, the cooling air of the radiator 40 is shown in FIG.
As shown by arrows in FIG. 3, the first cooling fan 52 causes the cooling air inlet 46h provided on the upper left surface of the upper cover 2uc in the vehicle width direction and the cooling air inlet 4 of the side cover 2sc.
6 is supplied from at least one of the cooling air inlets. For example, the cooling air is supplied to the upper cover 2.
The cooling air intake port 46h provided on the left upper surface in the vehicle width direction of uc is sucked downward into the engine room ER via the radiator 40, cools the radiator 40 and the engine 8, and then goes upward again. Cooling air outlet 4 of engine hood 11 provided on the right upper surface in the vehicle width direction
Since the engine room ER is discharged out of the engine room ER from 6k, the engine room ER can be effectively cooled.

Also, as shown in FIG.
And is provided along the second cooling fan 53 and is provided from the rear of the operator room 15 toward the hydraulic pump 26 so that the cooling air sucked by the second cooling air fan 53 is guided toward the hydraulic pump 26. Guide member G
Since M is provided, it is possible to prevent the above-mentioned high-temperature cooling air from flowing toward the operator room 15.

The guide member GM blocks the flow of the high-temperature cooling air that has cooled the oil cooler 50 with respect to the operator chamber 15 so that
To prevent the temperature from rising. The hydraulic oil tank 30, the front side partition Wfb, and the guide member GM form a cooling air passage S1 from the oil cooler 50 to the hydraulic pump 26, and are indicated by a two-dot chain line in FIG. As described above, the cooling air passages S1 and S2
1 and the rear side surface of the control valve 70 shown by a two-dot chain line in FIG. 1 are arranged substantially in a row, and the guide member GM, the control valve 70, and the hydraulic oil tank 30 are arranged in a line. Side or rear, front side bulkhead W
fb, the cooling air passages S1 and S
2 may be configured.

A storage box 33 is provided in front of the hydraulic oil tank 30 and the fuel tank 31. Since the present embodiment is configured as described above, the engine 8, the radiator 40, and the first cooling fan 52 include the partition plates W1, W2 provided on the radiator 40, the front side partition Wfb, and the counter weight 27 (or the rear weight). Side partition Wr
b), the rear partition Wc, and the engine hood 11 so as to surround the engine room ER, so that the noise generated when the first cooling fan 52, the engine 8 and the like are operated is cut off. Can be reduced.

On the other hand, the cooling air sucked by the second cooling fan 53 for cooling the oil cooler 50 through the cooling air inlets 46 and 46h provided in the left side cover 2sc and the upper cover 2uc is cooled. After flowing through the air passage S1 and cooling the control valve 70 and the hydraulic oil tank 30 and flowing through the cooling air passage S2 to cool the hydraulic pump 26,
Since the hydraulic oil is discharged from at least one of the cooling air outlets 46a and 46b,
With 0, the hydraulic pump 26 can be actively cooled.

Therefore, the above-mentioned hydraulic oil can prevent the hydraulic oil from being heated to a high temperature as described above. Therefore, even if the temperature of the hydraulic oil becomes abnormally high due to bad conditions under the hot sun, for example, the deterioration of the hydraulic oil due to heat and the hydraulic equipment It is possible to prevent the risk of deterioration of the sealing property of the seal. In the arrangement of the various devices shown in FIG. 1, the noise in the operator room 15 due to the exhaust noise of the muffler M can be reduced by disposing the muffler M away from the operator room 15.

The oil cooler 50 and the radiator 4
In order to reduce the flow resistance by separating the cooling fan and the cooling fan, dedicated cooling first and second cooling fans 52 and 53 are provided, and when necessary, the rotation speed is reduced as much as possible to supply a required air flow. In addition, the respective driving means 51, 52
a can be controlled separately, the noise of the operator room 15 and the construction machine as a whole is reduced,
Effective cooling can be performed.

Next, a modification of the above embodiment will be described with reference to FIG. 2. The same reference numerals are given to substantially the same portions as those of the above embodiment, and the differences will be described. As shown in FIG. 2, at least the side of the hydraulic oil tank 30 facing the oil cooler 50 or the second cooling fan 53 is, for example, an inclined surface P.
1, a curved surface P2, etc., and a gentle surface (inclined surface) WH from the right end of the front side partition Wfb to the rear partition Wc toward the hydraulic pump 26, and the cooling air resistance. The above-mentioned cooling air passages S1 and S2 are formed by substantially continuous surfaces.

Therefore, according to the configuration of the above modification, the second
The cooling air sucked from the cooling air inlets 46 and 46h by the cooling fan 53 cools the oil cooler 50, the control valve 70, and the hydraulic oil tank 30, and effectively operates the hydraulic pump 26 via the cooling air passages S1 and S2. After cooling, it is discharged from at least one of the cooling air outlet 46a provided on the side cover 2sc of the hydraulic shovel and the cooling air outlet 46b provided on the upper cover 2uc of the hydraulic shovel.

The hydraulic oil tank 30, as shown by the two-dot chain line in FIG.
Since the contact area with the cooling air is enlarged on the side surface or the rear surface of the above, the cooling efficiency of the working oil can be increased. Further, the guide member GM and the hydraulic oil tank 30
If a gap n is provided between the control valve 70 and the control valve 70, the ambient fluid that becomes high temperature and stays between the operator chamber 15 and the fuel tank 31 due to the cooling air flow flowing through the cooling air passages S1 and S2 will remain. Since the flow is sucked and the atmosphere fluid replaces the fresh air, the temperature of the atmosphere fluid can be lowered to prevent the temperatures of the operator chamber 15 and the fuel tank 31 from rising.

That is, the guide member GM and the control valve 70 are appropriately separated from each other by a gap n as shown by a two-dot chain line in FIG.
If it is arranged so as to be polymerized in consideration of the above, the suction effect of the atmospheric fluid can be increased by the jet effect, so that the cooling can be improved. In the cooling air passages S1 and S2, the high-temperature cooling air after cooling the oil cooler 50 and the atmospheric fluid sucked from the gap n are mixed, and the mixed cooling air having a reduced temperature is supplied to the hydraulic pump. Since cooling is performed by flowing in the 26 directions, the cooling effect can be improved.

Further, instead of the control valve 70 arranged as described above, a guide member GM may be extended to the hydraulic oil tank 30 to form the cooling air passages S1 and S2.
Further, as indicated by a two-dot chain line in FIG.
As described above, the outer surface of the front side partition wall Wfb, which is formed by the inclined surface P1, the curved surface P2, and the like, faces the above-described cooling air passage S1 from the upstream of the cooling air of the oil cooler 50 to the downstream thereof. , S2, the cooling air sucked by the second cooling fan 53 is directed toward the hydraulic pump 26, and the hydraulic pump 26 Active cooling is also possible.

The side surface or the rear surface of the hydraulic oil tank 30, such as the inclined surface P1 and the curved surface P2, may be a modified example as shown by a two-dot chain line in FIG. For example, the cooling air passages S1 and S2 may be formed by arranging the control valve 70 so as to be inclined as much as possible in accordance with the shape of the hydraulic oil tank 30 so that the flow of the cooling air is made smooth. Thus, the cooling effect may be improved.

The intercooler IC suitably provided as needed in the engine 8 is shown in FIG. As shown by the two-dot chain line in FIG. 2, it can be provided in the space in front of the radiator 40 in each of the above embodiments, or in the space in front of the oil cooler 50, and performs the above-mentioned cooling effectively, It can be manufactured.

Further, as described above, the cooling device composed of a plurality of devices is separated and independent, and the first and second cooling fans 5 are provided.
2, 53, the first and second cooling fans 52,
Considering one of the 53 cooling fans, the air passage pressure loss in the cooling air passage is reduced, and the horsepower of the one cooling fan increases the air volume and improves the cooling capacity.

Then, the first and second cooling fans 52, 5
By appropriately selecting the horsepower of No. 3, the first and second cooling fans 52 and 53 can be reduced in size while keeping the cooling capacity thereof, so that the cost and the noise can be reduced. Also, as described above, the radiator 4
0, the first cooling fan 52, the engine 8 is the radiator 4
0, partition walls W1 and W2, front side partition Wfb, rear side partition Wrb (or counterweight 27), rear partition Wc, engine hood 11, etc.
Since it is configured to be surrounded by R, it is possible to cut off and reduce the noise of the intake of the cooling air and the noise generated from the first cooling fan 52 and the engine 8.

In the above embodiment, as shown in FIGS. 1 and 2, the front surfaces of the oil cooler 50 and the radiator 40 have a continuous space in the front-rear direction of the construction machine. This space includes a battery, an air cleaner, and the like. Can be provided, and a long, for example, working scoop can be placed. Next, another modified example of the above-described embodiment will be described with reference to FIG. 3, and substantially the same portions as those in the above-described embodiment will be described with the same reference numerals.

The engine room ER according to the embodiment shown in FIGS. 1 and 2 includes the radiator 40, the partition plates W1 and W2, the front side partition Wfb and the rear side partition Wrb (or the counterweight 27), and the rear partition Wc. However, in this and other modified examples, the radiator 40 is used.
Is constituted by a front partition Wa. Further, the engine room ER is designed to block noise from the engine 8, the radiator 40, the first cooling fan 52 and the like. May be a partition constituting an enclosure provided to surround the partition wall.

The engine room ER and the engine room ER of the above-mentioned enclosure cover six surfaces around the engine 8, the radiator 40, the first cooling fan 52, and the like, for example.
As shown in FIG. 3, the front partition Wa, the front side partition W
fb, rear side partition Wrb (or counterweight 2
7), the partition wall Wc such as the rear partition wall Wc, the bottom partition wall Wd (or the under cover), the upper partition wall We (or the engine hood 11), and the like.

As shown in FIG. 3, a turbocharger 102 is provided above the engine 8 and connected to an intercooler IC via a flow pipe (not shown). The supercharged fluid cooled by the intercooler IC is supplied to the engine 8. It is configured to be supercharged. Further, in addition to the above, in the exhaust system of the engine 8 as shown in FIG.
A muffler M is disposed in the exhaust pipe 8a of the engine room ER, and an upper partition We of the engine room ER in which an outlet of the muffler M is disposed.
If an ejector EJ consisting of an outer pipe and an inner pipe that sucks the heated air in the engine room ER using the exhaust pressure of the engine discharged to the outside and discharges it to the outside is provided in a part of
The engine room ER, the engine 8 and the like can be more effectively cooled to improve the cooling efficiency.

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

If necessary, a plurality of slit-shaped 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, The above engine room ER
If the ventilation in the inside is promoted, the cooling efficiency can be improved. The intake port R1 is connected to the engine room ER.
Noise suppression means N for suppressing leakage of engine noise to the outside
Loopers R as S are provided, and these loopers R are formed by cutting and raising from the respective air ports R1.

Further, although not shown, the noise suppressing means NS has a sound absorbing effect at the intake port R1 formed in, for example, a box shape, and the noise suppression means NS is provided from the intake port R1 to the engine room E.
The engine noise and the intake noise leaking out of the R may be suppressed. Therefore, a negative pressure is generated around the engine exhaust flow spouting from the exhaust outlet end M1 of the exhaust pipe 8a provided in the engine 8, and the suction gap M3 also has a negative pressure.
By the pump action by the negative pressure, the air in the engine room ER can be sucked together with the heat and can be forcibly discharged to the outside.

In the case where the ejector EJ is provided, when the ejector EJ alone can sufficiently cool, the first cooling fan 52 can be omitted, and the cost can be reduced. In each embodiment, the cooling air outlets 46a and 46b shown in FIGS.
0 may be disposed at the position indicated by the solid line. In this case, the cooling air from the second cooling fan that has cooled the oil cooler 50 cools the hydraulic oil tank 30 and the fuel tank 31 to cool the construction machine. It is discharged in the forward direction.

[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 disposed on one side of a front end in the front-rear direction of the construction machine; and the hydraulic pump disposed horizontally between a counter weight provided at a rear portion of the construction machine and the operator room. Connected to the engine, the radiator disposed in front of the engine, a first cooling fan for cooling the radiator, a driving unit for driving the first cooling fan, An oil cooler disposed between the radiator or the first cooling fan and the operator room at the rear of the operator room, a second cooling fan for cooling the oil cooler, and a drive for driving the second cooling fan Means, a fuel tank and a hydraulic oil tank provided on the other side opposite to the one side and arranged so as to face the oil cooler, and the radiator, the first cooling fan, and the engine. Since the engine and the first cooling fan and the like are at least provided with an engine room constituted by a partition wall surrounding the engine, the first cooling fan and the first cooling fan are surrounded by the partition wall. The noise generated during the operation of the engine or the like is cut off and reduced, thereby achieving a fire prevention effect. The sucked the cooling air can cool said radiator in the engine room, the engine effectively.

The oil cooler and the radiator 40
And the flow resistance is reduced, and the rotation of each of the dedicated first and second cooling fans can be controlled separately, so that the noise in the operator room and the construction machine as a whole is reduced, and Cooling can be performed.
Further, since there is no entrainment between the hot air after cooling the oil cooler or the hot air after cooling the radiator, the cooling effects of the oil cooler and the radiator can be improved individually.

Accordingly, the operating oil can be prevented from being heated to a high temperature as described above, so that it does not easily deteriorate, and the seal of hydraulic equipment connected to the engine, the oil cooler, the radiator, the control valve, the working device, etc. Therefore, the reliability of these hydraulic devices can be improved. Further, since the oil cooler and the hydraulic oil tank are disposed in the vicinity, the oil cooler piping between the oil cooler and the hydraulic oil tank can be shortened, and the piping is simplified and the cost is reduced. be able to.

According to a second aspect of the present invention, in the construction machine cooling system according to the first aspect, the engine room includes a rear partition provided between the engine and the hydraulic pump, and the radiator. A front side partition connecting the front side of the construction machine and the front side of the rear bulkhead, and the rear side of the radiator of the construction machine and the rear of the rear bulkhead of the construction machine. Since it is constituted by the rear side partition which connects the side part, in addition to the effect of the above-mentioned claim 1, the engine, the radiator, the engine room and the like are effectively cooled, and the engine and the first cooling fan are provided. Noise from the vehicle can be reduced.

According to a third aspect of the present invention, there is provided a cooling device for a construction machine according to the first or second aspect, wherein the hydraulic oil tank on the side facing the oil cooler or the second cooling fan is provided. Cooling air of cooling air from the second cooling fan, which cools the hydraulic pump by a side surface of one of the fuel tanks or a rear surface of the one tank and a front side partition forming the engine room. Since the passage is formed, the cooling air sucked by the second cooling fan of the oil cooler flows through the cooling air passage to the control valve and the hydraulic oil tank. Since the oil pump can be cooled and the hydraulic pump can be cooled, the oil cooler and the hydraulic pump can be actively cooled.

According to the cooling device for a construction machine of the present invention described in claim 4, in the configuration according to claim 2 or 3, a front side portion of the engine room facing the side surface or the rear surface of the one tank. The outer surface of the partition wall is configured such that the cross-sectional area of the cooling air passage increases from upstream to downstream of the cooling air of the oil cooler. The contact area with the cooling air is increased, and the cooling effect is improved, and the cooling air is guided in the direction of the hydraulic pump, so that the hydraulic pump can be cooled effectively.

The cooling air sucked by the second cooling fan of the oil cooler flows while the cooling air is deflected in the direction of the fluid pump, so that the hydraulic pump can be more actively cooled. According to the cooling device for a construction machine according to the fifth aspect of the present invention, in the configuration according to the third or fourth aspect, the cooling air that has cooled the oil cooler flows through the cooling air passage of the oil cooler so that the hydraulic pump is driven. The cooling air that has been cooled and discharged from the cooling air outlet provided at least at one of the side and the upper side of the hydraulic pump and has cooled the radiator cools the engine, and then cooled above the engine room. Since it is configured to be discharged from the air outlet, in addition to the effect of claim 3 or 4, the cooling air that has cooled the radiator cools the engine and is discharged from the cooling air outlet above the engine room. The cooling air that has cooled the oil cooler cools the hydraulic pump, and then the cooling air outlet of the radiator and another cooling air outlet Can be carried out effectively cooled et discharged.

According to a sixth aspect of the present invention, there is provided a cooling device for a construction machine according to the fifth aspect of the present invention, which is provided between the operator room and the oil cooler and the side surface or the one side of the one tank. Since the guide member is provided so as to extend in the rear surface direction and guides the cooling air of the oil cooler to the hydraulic pump side, in addition to the effect of claim 5, the oil cooler is cooled. The high-temperature cooling air is prevented from flowing toward the operator room, is guided toward the hydraulic pump, and the guide member acts as an insulating member for the high-temperature cooling air with respect to the operator room. It is possible,
The flow of the cooling air becomes smoother and the cooling effect increases.

According to the cooling device for a construction machine according to the present invention, in the structure according to any one of the third, fourth, and fifth aspects, the cooling device is arranged substantially horizontally in the one tank and along the engine. And the control valve disposed between the oil cooler and the one tank. The cooling air of the oil cooler is provided by the one tank, the guide member, the control valve, and the front side partition. Since the passage is formed, in addition to the effect of any one of claims 3, 4, and 5, the cooling air which has cooled the guide member, the oil cooler, and the control valve and has become high temperature is directed toward the operator room. This prevents the flow, guides the hydraulic pump in the direction of the hydraulic pump, and has the effect of acting as a heat insulating member for the high-temperature cooling air on the operator room.却空 qi flow is the cooling effect is increased to more smoothly.

According to the cooling apparatus for a construction machine according to the present invention, in the structure according to any one of the first to third aspects, the driving means for the first and second cooling fans is hydraulically driven. Since it is configured to be driven by a motor, an electric motor, the engine, or the like, in addition to the effects of any one of claims 1 to 3, the oil cooler is controlled separately from the radiator, The cooling performance of the radiator and the oil cooler can be improved.

According to the cooling device for a construction machine according to the ninth aspect of the present invention, in the configuration according to any one of the first to third, fifth, sixth, and seventh aspects, the cooling device provided to the engine is provided. Since the intercooler for the feeder is disposed so as to overlap with either the radiator or the oil cooler,
In addition to the effects of any one of the first to third, fifth, sixth, and seventh aspects, the intercooler can be compactly disposed at the two positions as needed to improve the cooling effect.

According to a tenth 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 at least the side facing at least the second cooling fan or the oil cooler. 8. In addition to the effect of any one of claims 1 to 7, since the hydraulic oil tank has the surface area shape of the hydraulic oil tank configured to increase the surface area of the cooling air flowing from the second cooling fan. Since the working oil can be effectively cooled from the outer peripheral surface of the oil tank, the cooling effect can be improved and the size can be reduced in combination with the oil cooler, and the cost can be reduced.

According to the cooling apparatus for a construction machine according to the present invention, in the structure according to any one of the first to third, fifth, and eighth 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. Since it is configured so that the heated air in the engine room is sucked and discharged to the outside by using the exhaust pressure of the engine,
In addition to the effects of any one of the first to third, fifth, and eighth aspects, each part in the engine room can be effectively cooled.

[Brief description of the drawings]

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

FIG. 2 is a schematic explanatory view showing a modification of the embodiment of FIG. 1;

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

FIG. 4 is a schematic perspective view showing a conventional hydraulic excavator.

FIG. 5 is a schematic plan view showing the plane of FIG. 4;

[Explanation of symbols]

 2 Upper Revolving Structure 2sc Side Cover 2uc Upper Cover 4 Lower Traveling Body 6 Working Device 8 Engine 8a Exhaust Pipe 11 Engine Hood 12 Revolving Device 15 Operator Room 16 Car Body 18 Track Roller Frame 20 Traveling Device 22 Bucket 24 Boom 26 Hydraulic Pump 30 Hydraulic oil tank 31 Fuel tank 33 Storage box 40 Radiator 46 Cooling air inlet 46a, 46b Cooling air outlet 46h Cooling air inlet 46k Cooling air outlet 50 Oil cooler 52 First cooling fan 53 Second cooling fan 70 Control valve ER Engine room EJ Ejector M Muffler M1 Exhaust outlet end M2 Intake pipe M3 Suction gap NS Noise suppression means R1 Intake port W Partition W1, W2 Partition plate Wa Front partition Wfb Front side partition Wrb Rear side partition Wc Rear partition Wd Bottom partition We Upper partition (engine hood) IC intercooler S1 Cooling air passage S2 Cooling air passage

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (Reference) F01P 5/02 F01P 5/02 Z 5/04 5/04 ACD 5/06 507 5/06 507 510 510A 510B 11/08 11/08 C

Claims (11)

[Claims] 1. A high-pressure hydraulic oil which is transmitted from a hydraulic pump driven by an engine mounted on a construction machine to a traveling device, a working device and the like of the construction machine and returns to the high-temperature hydraulic oil. A cooling machine for a construction machine, comprising: an oil cooler for cooling the engine; and a radiator for cooling the cooling water for the engine, comprising: an operator room disposed at one side of a front end in a front-rear direction of the construction machine; Cooling the engine disposed horizontally between the counter weight provided at the rear of the machine and the operator room and connected to the hydraulic pump, the radiator disposed in front of the engine, and cooling the radiator A first cooling fan to be driven, driving means for driving the first cooling fan, and the operation between the radiator or the first cooling fan and the operator room. An oil cooler disposed at a rear portion of the cooler chamber, a second cooling fan for cooling the oil cooler, a driving means for driving the second cooling fan, and an oil cooler provided on the other side opposite to the one side. A fuel tank and a hydraulic oil tank disposed so as to face the oil cooler, and an engine room formed by a partition surrounding at least the engine among the radiator, the first cooling fan, and the engine. A cooling device for a construction machine. 2. The engine room connects a rear partition provided between the engine and the hydraulic pump, a side of the radiator in the front direction of the construction machine, and a front side of the rear partition. A front side partition wall, and a rear side partition wall connecting a side portion of the radiator in the rear direction of the construction machine and the rear side portion of the rear partition wall. Item 2. A cooling device for a construction machine according to item 1. 3. The engine room includes a side surface of one of the hydraulic oil tank and the fuel tank on a side facing the oil cooler or the second cooling fan or a rear surface of the one tank. 3. The cooling device for a construction machine according to claim 1, wherein a cooling air passage for cooling air from the second cooling fan that cools the hydraulic pump is formed by the front side partition that performs cooling. 4. An outer surface of a front side partition wall of the engine room facing the side surface or the rear surface of the one tank has a cross-sectional area of the cooling air passage from upstream to downstream of cooling air of the oil cooler. The cooling device for a construction machine according to claim 2, wherein the cooling device is configured to expand. 5. A cooling air outlet that is provided at at least one of a side and an upper side of the hydraulic pump by cooling the oil cooler and flowing through the cooling air passage of the oil cooler to cool the hydraulic pump. The cooling air discharged from the cooling device and cooling the radiator is configured to be cooled and then discharged from a cooling air outlet provided above the engine room after cooling the engine. 4. The cooling device for a construction machine according to 4. 6. An oil cooler is provided between the operator room and the oil cooler, and is provided so as to extend in a direction of the side surface or the rear surface of the one tank, and cools the oil cooler to the hydraulic pump side. The cooling device for a construction machine according to claim 5, further comprising a guide member provided so as to be guided. 7. The control valve according to claim 1, further comprising: a control valve disposed between the oil cooler and the one tank, the control valve being substantially parallel to the one tank and provided along the engine. The cooling air passage of the oil cooler is constituted by a guide member, a control valve, and a front side partition.
The cooling device for a construction machine according to any one of claims 4 and 5. 8. The apparatus according to claim 1, wherein the driving means for the first and second cooling fans is configured to be driven by one of a hydraulic motor, an electric motor, and the engine. The cooling device for a construction machine according to any one of claims 1 to 3. 9. An intercooler for a supercharger provided in the engine is provided so as to overlap with one of the radiator and the oil cooler. The cooling device for a construction machine according to any one of claims 5, 6, and 7. 10. The hydraulic oil tank having a surface area at least on a side facing the second cooling fan or the oil cooler configured to increase a surface area through which cooling air flows from the second cooling fan. The cooling device for a construction machine according to any one of claims 1 to 7, characterized in that: 11. An exhaust outlet end of an exhaust pipe of an engine disposed in the engine room, and protruding longer than the exhaust outlet end at least with an interval from the exhaust outlet end, and An ejector comprising a suction pipe provided in a partition wall constituting the ejector, and configured to suck heated air in the engine room using the exhaust pressure of the engine and discharge the heated air to the outside, The cooling device for a construction machine according to any one of claims 1 to 3, 5, and 8.