JP2001064995A - Cooling structure of construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce noise and improve the cooling effect of a construction machine, an agricultural machine or the like (hereafter, simply referred to as a construction machine) such as a hydraulic shovel, a self loader, a bulldozer, a wheel loader and a crawler loader in relation to the cooling structure of the construction machine. SOLUTION: An engine 8 is provided in an engine room ER surrounded by a partition wall W, an engine cooling radiator 18 cooling at least the engine 8 is provided in the outside of the engine room ER, and cooling water cooled by the radiator 18 is circulated in the engine 8 through pieces of piping 18a, 18b to cool the engine 8. Air heated in the engine room ER is sucked by using the exhaust pressure of the engine 8 provided in the engine room ER to provide an ejector EJ discharged in the outside of the engine room ER, and the reduction of noise generated during the operation of a construction machine and the improvement of cooling effect can be contrived.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling structure for a construction machine such as a hydraulic shovel, a self-loader, a bulldozer, a wheel loader, a crawler-type loader, a construction machine, 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 crawler-type loaders are known.
As is well known, it is used for excavating rocks such as dams, tunnels, rivers, and roads in mountainous areas, and breaking down buildings and buildings. The structure of the construction machine includes, for example, a hydraulic excavator including a lower traveling body 1, an upper revolving body 2 rotatably disposed above the lower traveling body 1 as shown in FIG. 3 with a working device 6 provided for performing various tasks
It consists of two parts.

As shown in FIGS. 6 and 7, the upper revolving unit 2 includes an engine 8, a hydraulic device (not shown), a revolving device, an operator room 10, and the like, in addition to the working device 6 described above. Side cover 2 that covers the outer peripheral side of upper revolving unit 2
sc, an upper cover 2u covering the upper outer periphery of the upper swing body 2
c, an engine hood 17 and the like. As shown in FIG. 6, the lower traveling body 1 is composed of a car body (not shown), a track roller frame, a traveling device, and a suspension device.
Boom 24 and arm 25 for supporting the hydraulic cylinder, and various hydraulic cylinders and link rods for operating the same.
And it is comprised of the above-mentioned turning device, traveling device and the like.

[0006] As shown in FIG. 6, between a counter weight 14 provided at the rear of the hydraulic excavator and the operator room 10, a front side of the counter weight 14 is provided as shown in FIG.
The engine 8 to which the hydraulic pump 16 is connected as shown in FIG.
Are arranged horizontally. This engine 8 is provided around the engine 8 in the upper swing body 2 of the hydraulic excavator.
It is housed in an engine room ER formed in an enclosure surrounding the side of the surface.

Further, an engine room E in front of the engine 8 is provided.
A radiator 18 is provided outside R, and a cooling fan 20 driven by the engine 8 for cooling the radiator 18 is connected to the front side of the engine 8 in the engine room ER. Further, as shown in FIG. 7, the engine room ER includes a front partition plate 32, left and right side partition plates 34, a rear partition plate 36, the above-described front partition plate 32, and left and right side partition plates of the engine 8. 34, an upper partition (engine hood) 17 for closing an upper opening surrounded by a rear partition 36 and a lower partition 39 for closing a lower opening.

A cooling fan 20 driven by a rotating shaft 8a connected to the engine 8 is provided in the engine room ER, and the radiator 18, the oil cooler and the like are cooled so as to face the cooling fan 20. Machine 100
Is provided, and in the present embodiment, a radiator 18 is provided. Further, the cooling fan 20 takes in cooling air from the inlet opening 2g of the left side cover 2sc of the construction machine and cools the radiator 18 through the inlet opening 32a of the front partition plate 32 of the engine room ER. The engine 8 is sucked into the engine room ER and further cooled by the cooling air supplied to the engine 8 from the cooling fan 20.
The hot air generated from the peripheral devices and the surrounding devices is discharged to the outside through the outlet opening 17a of the engine hood 17 in the engine room ER.

Further, as shown in FIG.
The exhaust of the R engine 8 is discharged from the exhaust pipe 9b via the exhaust pipe 9a and the exhaust muffler M. The engine room E
A hydraulic pump 16 driven by the engine 8 is provided outside the rear partition plate 36 on the rear side of the R. The hydraulic pump 16 is connected to the rear partition wall 3 of the engine room ER.
6. The hydraulic shovel is configured to be accommodated in a hydraulic pump chamber PR constituted by a right side cover 2sc, an upper cover 2uc, and a front surface of a counter weight 14 of the hydraulic excavator. For example, a part of the cooling air provided between them, for example, for cooling an oil cooler or the like, flows into the hydraulic pump chamber PR, and the hydraulic pump chamber P
By the outlet opening 40 provided in the upper cover 2uc of R and the right side cover 2sc, the hydraulic pump 16 and the hydraulic pump chamber PR are discharged together with the heated air in the hydraulic pump chamber PR and discharged. It is configured to:

[0008]

However, in the engine room ER formed in the enclosure of the above-mentioned conventional hydraulic shovel, the inlet opening of the left side cover 2sc of the hydraulic shovel as shown in FIG. External air is taken in from the 2 g by a cooling fan 20 to cool the radiator 18, and this cooled air is discharged into the engine room ER.
The engine 8 is cooled by flowing into the engine room ER from the entrance opening 32a of the front partition plate 32 to cool the engine hood 17.
Of the cooling air sucked into the engine room ER by the cooling fan 20 and discharged to the outside, for example, the inlet opening 32a is formed in the front partition plate 32 as shown in FIG. And the engine hood 17
Since it is necessary to provide the outlet opening 17a, the degree of sealing of the enclosure surrounding the engine 8 must be reduced.

Therefore, the noise generated from the engine 8 easily leaks to the outside together with the heat radiated to the outside of the engine room ER, thereby deteriorating the noise level. The hydraulic pump chamber PR is also provided with an outlet opening 40. Therefore, the noise generated from the hydraulic pump 16 and the discharge noise discharged from the outlet openings 17a and 40 are easily leaked to the outside, so that the noise level is deteriorated.

Further, in order to reduce the noise generated outside the engine room ER from leaking to the outside, simply increasing the degree of sealing of the enclosure of the engine room ER will reduce the heat generated in the engine room ER. It is difficult to discharge the fuel to the outside, and the conventional technology around the engine 8 cannot effectively solve both of the above problems at the same time.

The radiator 1 directly connected to the engine 8
Since the number of rotations of the cooling fan 20 for 8 is determined by the number of rotations of the engine and cannot be variably controlled even when the environmental temperature fluctuates, there is also a problem that the cooling fan 100 cannot be appropriately performed in accordance with the fluctuation of the water temperature of the cooler 100. The present invention has been made in view of the above problems, an engine is disposed in an engine room surrounded by a partition, and a radiator for engine cooling water for cooling the engine is disposed outside the engine room. The engine is cooled by the cooling water cooled by the radiator, and heated air in the engine room is provided by using the exhaust pressure of the engine provided at a portion in the engine room and discharged to the outside of the engine room. It is an object of the present invention to provide a construction machine cooling structure in which an ejector that sucks and discharges air to the outside of the engine room is arranged to reduce noise generated during operation of the construction machine and improve cooling efficiency. .

[0012]

According to a first aspect of the present invention, a cooling structure for a construction machine according to the present invention includes an engine room surrounded by a partition, an engine disposed in the engine room, and A cooling system having at least the radiator of a radiator for cooling water of the engine, an oil cooler for hydraulic oil of construction equipment, and a cooler of an intercooler for supercharging fluid of an engine supercharger provided outside the room. A pipe for supplying cooling water cooled by the cooling machine to the engine; and a pipe for cooling the engine and supplying the cooling water heated to the cooling machine. Using the exhaust pressure of the engine, which is provided at a setting portion set according to the design specifications of the engine and is discharged to the outside of the engine room, The heated air is characterized by comprising an ejector for releasing to the outside of the draft above the engine room.

According to a second aspect of the present invention, there is provided a construction machine cooling structure according to the first aspect, wherein the engine room is provided on a side of an operator room of the construction machine. According to a third aspect of the present invention, in the cooling structure for a construction machine according to the first or second aspect, a hydraulic pump for hydraulic oil connected to the engine is provided, and the hydraulic pump is provided to house the hydraulic pump. A part of the side wall of the hydraulic pump room is opened, and a cooling fan for cooling a cooler provided with at least one of the coolers is provided outside the engine room. It is configured such that heated air in the hydraulic pump chamber is discharged out of the hydraulic pump chamber through an opened part of the side wall of the hydraulic pump chamber by a cooling air flow of cooling air that has cooled the cooler. It is characterized by:

According to a fourth aspect of the present invention, there is provided a cooling structure for a construction machine according to any one of the first to third aspects, which is disposed at a front end in a front-rear direction of one side of the construction machine. The operator room, the engine disposed behind the operator room, the engine room surrounded by a partition that houses the engine, and the front side of the front partition of the engine room in front of the engine. Any one of the radiator and the cooler of the oil cooler provided, one cooling fan for cooling the one cooler, and driving means for driving the one cooling fan, One of the radiator and the cooler of the oil cooler disposed between the one cooler and the operator room and the other cooler for cooling the other cooler. A fan, driving means for driving the other cooling fan, and another side of the one side portion opposite to the one side portion provided so as to face at least a cooling air flow from the other cooling fan for cooling the other cooling device. And at least one of a fuel tank and a hydraulic oil tank provided in the section.

According to a fifth aspect of the present invention, there is provided a cooling structure for a construction machine according to the fourth aspect, wherein the fuel tank and the hydraulic oil disposed on the other side opposite to the one side are provided. At least one of the tanks, and at least one of the side faces of the tank facing the flow of the cooling air that has cooled the other cooler is an upper side or a front side of the construction machine. And a guiding means for guiding the cooling air to at least one of the sides.

According to a sixth aspect of the present invention, there is provided a cooling structure for a construction machine according to any one of the first to third and fifth aspects, wherein the ejector projects from a muffler of an engine exhaust pipe. A pipe, an outer pipe protruding from the partition wall longer than the inner pipe around the inner pipe, and a suction gap formed between the inner pipe and the outer pipe to suck air in the engine room. It is characterized by having.

According to a seventh aspect of the present invention, there is provided a cooling structure for a construction machine according to any one of the first to third, fourth, and sixth aspects, wherein the ejector for sucking air in the engine room is provided. It is characterized in that the suction gap is disposed in a high-temperature part in the engine room. The cooling structure for a construction machine according to the present invention described in claim 8 is a cooling structure for a construction machine.
The configuration according to any one of Items 7 and 8, wherein the intake port provided in the engine room includes a noise suppression unit that suppresses leakage of the engine noise to the outside.

According to a ninth aspect of the present invention, in the cooling structure for a construction machine according to the eighth aspect of the present invention, the intake port is provided on a surface of the partition of the engine room which is different from a surface receiving the air from the cooling fan. It is characterized by being provided. According to a tenth aspect of the present invention, there is provided a cooling structure for a construction machine according to any one of the first, third, fourth, sixth and seventh aspects, wherein the cooling device of the intercooler for a supercharger of the engine is provided. Are disposed outside the engine room.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 5. The same reference numerals will be given to substantially the same portions as those in the above-mentioned conventional example. FIG. 1 shows an embodiment of the present invention, and is a schematic plan view showing a case where a cooling structure of a construction machine according to the present invention is applied to a hydraulic shovel. FIG. 2 is a main sectional view taken along line 2A-2A in FIG. FIG. 3 is a schematic explanatory view showing a main part of a cross section taken along line 3A-3A in FIG. 1, and FIG. 4 shows a seal structure of a joint portion of each partition constituting the engine room in FIG. Schematic explanatory diagram,
FIG. 5 is a schematic perspective view of a hydraulic excavator showing a flow of cooling air of the radiator and the oil cooler of FIG.

As shown in FIGS. 1 to 5, an operator room 10 is provided at the front end in the front-rear direction of one side 1a of the excavator.
The engine 8 is provided horizontally between a counter weight 14 provided at the rear of the construction machine and the operator room 10 and connected to a hydraulic pump 16. The engine room ER that houses the engine 8 is configured as an enclosure that surrounds the engine 8 with a partition wall W.

Then, one of the radiator 18 for the engine cooling water and the cooler 100 of the oil cooler 22 for the working oil of the hydraulic shovel disposed in front of the engine room ER in front of the engine 8. A radiator 18 serving as a cooler, one cooling fan 20 for cooling one of the coolers, and a driving unit 25 for driving the one cooling fan 20 are provided.

Further, a radiator 18 for engine cooling water and an oil cooler 22 for the working oil are provided between the radiator 18 as one of the cooling machines and the operator room 10.
An oil cooler 22 as one of the other coolers, a cooling fan 20a for cooling the other cooler, and a driving unit 27 for driving the other cooling fan 20a. .

The driving means 25, 27 for driving the cooling fans 20, 20a are constituted by any one of a hydraulic motor, an electric motor and the engine 8. In this embodiment, the driving means 25, 27 are driven by a hydraulic motor (not shown). It is configured to be. As shown in FIGS. 1 to 3, the engine room ER includes a partition wall W on all six sides of the engine 8.
, So that the operating noise of the engine 8 and the noise of the cooling air flowing outside the engine room ER do not leak as much as possible.

That is, as shown in FIGS. 1 to 3, the partition wall W which defines the engine room ER formed in the enclosure is a front partition Wa, a rear partition Wc, a front partition Wa and a rear partition Wa. A front side partition Wfb and a rear side partition Wrb (or can also be used as the counterweight 14) arranged so as to be bridged with Wc. Further, the engine room ER of the enclosure is, for example, as shown in FIGS.
Front partition Wa, front side partition Wfb, rear side partition Wr
b, an upper partition We (or engine hood 17) and a bottom partition Wd (or under cover) for closing the upper opening and the lower opening formed by being surrounded by the rear partition Wc. It is configured to at least substantially surround the periphery of the engine 8.

Then, as shown in FIG. 1, the engine 8 in the engine room ER is cooled, and heated cooling water is supplied to the radiator 18 by the pipe 18a.
The cooling water cooled in 8 is supplied to the radiator 1 by a pipe 18b.
The engine 8 is circulated from the engine 8 to the engine 8 to cool the engine 8 in the engine room ER. Then, as shown in FIG. 3, a turbocharger 102 is provided above the engine 8, which is appropriately provided as necessary, and is connected to the intercooler IC via the circulation pipe as shown in FIG. The cooled supercharging fluid is configured to be supercharged to the engine 8.

Further, the intercooler IC may be arranged together with one of the above-mentioned coolers or by the intercooler IC alone on the front side of the front partition Wa of the engine room ER. Also, as shown in FIGS.
Muffler M in the exhaust pipe 8a of the engine 8
The engine room ER is disposed at the upper partition wall We of the engine room ER where the outlet of the muffler M is disposed by using the exhaust pressure of the exhaust gas of the engine discharged to the outside.
An ejector EJ comprising an outer tube and an inner tube for sucking heated air inside and discharging the heated air to the outside is provided.

The cooling water pipes 18a and 18b provided between the radiator 18 and the engine 8 as described above.
In addition to cooling the engine 8 by circulating the cooling water through the engine, the ejector EJ can further effectively cool the engine room ER, the engine 8 and the like, thereby improving 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,
An exhaust pipe M2 as an outer pipe protruding from the engine room ER longer than the exhaust outlet end M1 with a space around the exhaust outlet end M1, and an exhaust pipe M2 and an exhaust pipe M2 described above. And a suction gap M3 formed between the engine room ER and sucking air in the engine room ER.

As shown in FIG. 3, the ejector EJ is a cooling air passage EY in the engine room ER.
The cooling efficiency is improved by providing a large number of slit-shaped intake ports R1 as necessary in the bottom partition wall Wd of the engine room ER located on the opposite side of the engine room ER so as to facilitate ventilation in the engine room ER. Can be done. This intake port R1 is provided with a looper R as a noise suppression means NS for suppressing leakage of engine noise to the outside of the engine room ER.
These loopers R are formed by cutting and raising from the respective intake ports R1.

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, even if the air blows from the cooling fan 20 to the under cover Wd, if the cut-and-raised direction of the looper R is provided so as to project in the same direction as the air blow from the cooling fan 20, the cooling fan Ventilation from 20 does not directly affect intake port R1.

Therefore, the exhaust pipe 8 provided in the engine 8
a, a negative pressure is generated around the engine exhaust flow spouting from the exhaust outlet end M1 of FIG. 1a, and the suction gap M3 also becomes a negative pressure. Can be forcibly discharged to the outside. If the ejector EJ alone is not sufficient, a small cooling fan 20b may be provided at an appropriate position in the engine room ER as shown by a two-dot chain line in FIG.

In the above-described embodiment, the ejector EJ is provided at the outlet opening 17h provided in the upper partition We of the engine room ER. However, the present invention is not limited to this.
For example, as shown by the two-dot chain line in FIG. By arranging the suction gap M3 of the ejector EJ in a high-temperature area in the engine room ER, such as a high-temperature area where the heated air stays, the above-described effective operation and effect can be obtained.

Also, as shown in FIG. 1 and FIG.
Partition wall Wc which is a partition wall separating the hydraulic pump 16 and the hydraulic pump 16
And a right side portion 2 of the upper swing body 2 of the hydraulic excavator.
The upper cover 2uc closing the upper opening between the SC and the rear partition Wc, the lower cover 2rc closing the lower opening between the rear partition Wc and the right side 2sc, and the front wall of the counterweight 14. Pump chamber P surrounded by
R is provided adjacent to the engine room ER.

Also, as shown in FIGS. 1 and 2, one side 1a
At least one of the fuel tank 31 and the hydraulic oil tank 30 disposed on the other side 1b on the opposite side is used to cool the oil cooler 22, which is the other cooler, with the flow of cooling air. They are provided to face each other.
The right side 2sc of the hydraulic pump chamber PR
Of the hydraulic pump chamber PR formed by the rear partition wall Wc, the upper cover 2uc, the lower cover 2rc, and the front surface of the counter weight 14, and the hydraulic oil tank 30 and the front open side wall of the construction machine. It is configured such that a gap PS set according to design specifications is formed therebetween.

The tank disposed on the other side 1b so as to face the front open side of the construction machine of the hydraulic pump chamber PR is either one of the hydraulic oil tank 30 and the fuel tank 31. In this embodiment, the hydraulic oil tank 30 is provided as described above. Then, as shown in FIG. 1, the hydraulic pump chamber PR is heated by the cooling airflow that is taken in by the cooling fan 20a that cools the oil cooler 22 disposed outside the engine room ER and cools the oil cooler 22. The ventilated air is ventilated to the air outside the hydraulic pump chamber and can be cooled.

That is, as shown in FIG. 1, the hydraulic pump chamber PR is provided with the right side cover 2sc,
The upper cover 2uc has no outlet opening 40 for discharging to the hydraulic pump chamber PR of the conventional example shown in FIG. 7, and the right side cover 2sc, the upper cover 2uc, and the front surface of the counter weight 14, etc. Hydraulic pump room PR by operation
Since the outer wall side is substantially sealed, the leakage of noise due to the operation of the hydraulic pump 16 and the like to the outside can be significantly reduced, and a low-noise construction machine can be obtained.

As shown in FIGS. 1 and 5, the cooling air is taken in through openings 50a and 50b provided in the upper cover 2uc as shown by arrows Z1 and Z4. And,
The cooling air that has cooled the radiator 18 and the oil cooler 22 and has cooled the radiator 18 hits the front surface of the front partition Wa of the engine room ER and flows upward as indicated by an arrow Z1. The atmosphere fluid in the hydraulic pump chamber PR is indicated by an arrow Z4.
The cooling air taken in as shown in FIG.
The air is discharged by the cooling air pressure of the cooling air that has cooled the air, and the outside air invades from a naturally formed gap due to the configuration of the hydraulic pump chamber PR, and the heated cooling air in the hydraulic pump chamber PR is ventilated to cool the hydraulic pump chamber PR. It can be cooled.

Further, as shown in FIG. 5, if necessary, at least the side surface of the one tank opposite to the side of the cooling air is connected to the upper side or the front side of the hydraulic excavator. A guiding means G for guiding the cooling air may be provided on at least one of the sides. And when the above-mentioned guidance means G is provided,
As shown in FIG. 5, the ambient fluid of the heated cooling air in the hydraulic pump chamber PR by the above-described guide surfaces G1, G2 and the like is an arrow of the cooling air that has cooled the radiator 18 and the cooling air that has cooled the oil cooler 22. By the flow in at least one of the directions flowing in the Z5 and Z6 directions,
Through a gap PS between the hydraulic oil tank 30, the front side partition Wfb, and the hydraulic pump chamber PR, a so-called Venturi action actively sucks, discharges, and ventilates the air, so that the temperature of the hydraulic pump chamber PR Can be prevented from rising.

Since at least the outer wall of the hydraulic pump chamber PR is substantially sealed, the noise of the operation of the hydraulic pump 16 can be cut off. The guiding means G is shown in FIG.
As shown in the figure, the hydraulic oil tank 30 is constituted by a guide surface G1 inclined upward from the lower part, and the fuel tank 31 is constituted by a guide surface G2 inclined forward from the rear.
However, the present invention is not limited to this. For example, guide surfaces G1, G2
May be provided in both tanks as appropriate, or the guide surface G
1 and G2 may be formed in a shape in which the guiding surfaces G1 and G2 are superimposed on one surface of the tank.

Further, even if the guide surfaces G1 and G2 are formed separately from the side surface of the above-mentioned tank, the same operation and effect can be obtained. On the other hand, outside the engine room ER, a hydraulic pump 16 driven by the engine 8 is disposed on the right side in FIG.
The radiator 18 is disposed separately on the left side outside the engine room ER, and the radiator 18 for engine cooling and the oil cooler 22 for hydraulic oil of the hydraulic circuit are superimposed and shown in FIG. It may be arranged on the radiator 18 side or the oil cooler side.

The cooling fans 20, 20a provided opposite to the cooler 100 and driving means 25, 27 for driving the cooling fans 20 and 20a are also provided in the engine room E.
It is arranged outside R. The driving means 25, 27
Drives a cooling fan 20, 20a in place of a conventional engine using a hydraulic motor that is rotationally driven by hydraulic oil supplied from a hydraulic pump 16 or an electric motor that is rotationally driven by a vehicle-mounted battery. By controlling the number of rotations of this motor in accordance with the ambient temperature or the like, regardless of the number of rotations of the cooling fan 20, the cooling fans 20, 20a
It is configured to be able to arbitrarily control the amount of air blown and to appropriately cool the water temperature and the oil temperature.

The driving means 2 for the engine 8, the radiator 18, the oil cooler 22, and the cooling fans 20, 20a
Since the support structures such as 5, 27 are not special, the description and drawings of these support structures are omitted. Furthermore,
As shown in FIG. 4, for example, a cushion-type sealing material 29 is interposed between the partition walls constituting the engine room ER of the enclosure, and the sealing material 29 prevents noise from leaking from the engine room ER to the outside. In addition, it prevents the ingress and egress of air and also prevents the propagation of vibration.

The sealing member 29 includes, for example, a fitting portion 29a having a U-shaped cross section fitted to one of the above-mentioned partition walls W, and a contact portion 29b having a circular hollow cross section to make contact with the other partition wall W. The sealing property between the partition walls W is ensured by the elasticity of the contact portion 29b. As described above, in order to prevent the engine noise from being emitted to the outside, the degree of sealing of the enclosure surrounding the engine 8 is increased, and the cooling fan 18 and the oil cooler 22 are isolated from the engine 8, and the engine room E
R, the cooling fans 20, 20a are driven by driving means 25, 27 constituted by hydraulic or electric motors, and the temperature in the engine room ER is released to the outside. Muffler M for exhaust
Since the heat is dissipated from the suction gap M3 using the exhaust pressure described above, the opening area of the suction gap M3 is small, and the noise of the engine 8 hardly leaks from the suction gap M3 to the outside.

Further, as shown in FIG.
A seal cover K3 is provided in a gap between the rear part of the radiator 18 and the oil cooler 22. Further, a partition plate W1 is provided between the front side partition Wfb and the radiator 18 and the oil cooler 22 via seal covers K1 and K2, and common cooling air is introduced into the front side of the radiator 18 and the oil cooler 22. For example, when the radiator 18 or the cooling fan 20 is enlarged to increase the amount of air to be taken into the radiator 18 or to increase the cooling capacity of the radiator 18, the space SP is provided. Without changing the design of the part
It can be performed freely in this state.

Further, as shown by a two-dot chain line in FIG. 1, the partition wall plate W1 may be provided with an extended partition wall plate W1a extending to the left side cover 2sc. Further, the cooling air passages of the radiator 18 and the oil cooler 22 are divided by the extended partition wall plate W1a to form independent cooling air passages on the radiator 18 side and the oil cooler 22 side, respectively.
If the amount of cooling air in each of the oil coolers 22 is ensured, the above-mentioned cooling can be effectively obtained without fail.

The extended partition wall plate W1a is provided with a radiator 18
And a partition wall formed of a separate member from the partition plate W1 that forms independent cooling air passages on the cooling air intake side of the oil cooler 22. in this way,
By the partition plate W1 and the extended partition plate W1a, it is possible to secure the intake amount of the cooling air to the radiator and the intake amount of the cooling air to the oil cooler.

In addition, the partition wall plate W1 and the extended partition wall plate W1
a, seal covers K1 to K3 and counter weight 14
Cover K4 provided between the radiator 18 and
Has a sealing effect to prevent hot air discharged to the downstream side of the radiator 18 and the oil cooler 22 through the respective gaps from rewinding to the upstream side. For example, urethane foam, sponge, rubber, etc. High sealing effect,
It is formed of a heat-resistant flexible elastic material.

In the embodiment shown in FIG. 1, the radiator 18 and the oil cooler 22 are disposed between the operator room 10 and the engine 8, and the other side 1b opposite to the one side 1a is provided on the other side 1b. The fuel tank 31 and the hydraulic oil tank 30 are arranged side by side in the front-rear direction of the hydraulic shovel, but are not limited thereto.
8. The oil cooler 22 is disposed on the other side 1b of the construction machine, and the hydraulic oil tank 30 or the fuel tank 31 replaces the radiator 18 and the oil cooler 22 disposed at the rear of the operator room 10 shown in FIG. , Or when the engine 8 is disposed in the opposite direction to the left and right, substantially the same operation and effect as the above embodiment can be obtained.

The hydraulic pump chamber PR is provided with the upper cover 2uc and the side cover 2sc of the upper swing body 2 as described above.
As a result, at least the outside is substantially closed, so that the noise of the operation of the hydraulic pump 16 can be cut off.
Also, as shown in FIGS. 1 and 5, the upper cover 2 uc covering the upper part of the radiator 18, the oil cooler 22, the cooling fan 24, the driving means 25 and 27, and the upper part of the hydraulic oil tank 30 are bridged. An upper cover 2uc is provided.

The left side cover 2sc of the hydraulic shovel is provided with double doors D1 and D2 which can be opened and closed via hinges HG similarly to the above embodiment. When the cooling air is insufficient, the side cover 2sc and the doors AD1, D2 of the hydraulic shovel shown in FIG.
If the cooling air inlet is provided in 2, the above cooling effect can be further improved.

[0050]

As described above in detail, according to the cooling structure for a construction machine according to the first aspect of the present invention, an engine room surrounded by a partition, an engine disposed in the engine room, The radiator has at least one of a radiator for cooling water of the engine, an oil cooler for hydraulic oil of construction equipment, and a cooler for an intercooler for supercharging fluid of an engine supercharger, which is disposed outside the engine room. A cooling device, a pipe for supplying cooling water cooled by the cooling device to the engine, a piping for cooling the engine and supplying the cooling water heated to the cooling device, Using the exhaust pressure of the engine, which is provided at a setting portion set according to the design specification of the room and is discharged to the outside of the engine room, An ejector that sucks out heated air and discharges it to the outside of the engine room is provided, so that the engine is housed in the engine room and noise caused by the operation of the engine is prevented from leaking outside the engine room as much as possible. At the same time, the engine is cooled by circulating cooling water cooled by the radiator, and further, the heated air in the engine room is sucked out by the ejector to prevent the temperature of the engine and the engine room from rising. In this way, both the prevention of the noise leakage and the cooling can be effectively improved.

Further, since the engine is not cooled by the fluid flow of the cooling air of the cooling fan, the fluid flow of the cooling fan does not generate noise of the fluid noise hitting the engine.
The noise of the construction machine can be reduced. Claim 2
According to the construction machine cooling structure of the present invention described above, claim 1 is provided.
In the configuration described above, the engine room is provided on the side of the operator room of the construction machine. Therefore, in addition to the effect of claim 1, the position where the engine room is disposed is set according to design specifications. In this case, both the prevention of noise leakage and the cooling can be effectively improved, and the degree of freedom in designing a design at the time of designing can be improved.

According to a third aspect of the present invention, there is provided a cooling structure for a construction machine according to the first or second aspect, wherein a hydraulic pump for hydraulic oil connected to the engine is provided and the hydraulic pump is housed. A cooling fan that cools a cooler provided with at least one of the coolers outside the engine room by opening any part of the side wall of the hydraulic pump chamber provided to perform the cooling operation. The heated air in the hydraulic pump chamber is discharged to the outside of the hydraulic pump chamber through an opened portion of the side wall of the hydraulic pump chamber by a cooling air flow of cooling air that has cooled the cooler by the cooling fan. The cooling air is discharged by the cooling air pressure of the cooling air that has cooled the cooler, and is added to the structure of the hydraulic pump chamber. Outside air enters from the gap can naturally Te, can be allowed to ventilate the heated cooling air in the hydraulic pump chamber.

According to a fourth aspect of the present invention, there is provided a cooling structure for a construction machine according to any one of the first to third aspects, wherein the one side of the construction machine is disposed at a front end in a front-rear direction. The operator room, the engine disposed behind the operator room, the engine room surrounded by a partition that houses the engine, and the front side of the front partition of the engine room in front of the engine. Any one of the radiator and the cooler of the oil cooler provided, one cooling fan for cooling the one cooler, and driving means for driving the one cooling fan, One of the radiator and the oil cooler cooler disposed between the one cooler and the operator room, and the other cooler for cooling the other cooler. Cooling fan, driving means for driving the other cooling fan, and at least one of the opposite sides of the one side portion provided so as to face a cooling airflow from the other cooling fan for cooling at least the other cooling machine. Claims 1 to 3 are provided with at least one of a fuel tank and a hydraulic oil tank disposed on the side.
In addition to the effect of any one of the above, a part of the cooling air that has cooled at least the other cooler corresponding to the at least one of the tanks enters the hydraulic pump chamber to ventilate the heated air, and the above-described hydraulic pump chamber And the hydraulic pump can be cooled.

According to a fifth aspect of the present invention, there is provided the cooling structure for a construction machine according to the fourth aspect, wherein the fuel tank and the fuel tank arranged on the other side opposite to the one side are provided. At least one of the hydraulic oil tanks and at least a side of at least one of the tanks facing the flow of cooling air that has cooled the other cooler is an upper side of the side of the construction machine. In addition, since at least one of the front sides is provided with a guiding means for guiding the cooling air, in addition to the effect of the fourth aspect, the heated cooling air in the hydraulic pump chamber is supplied to one of the cooling units. At least one of the cooling air that has cooled the cooling machine and the cooling air that has cooled the other cooling machine has at least one side of the construction machine that is guided by the guiding means of the one tank. Since the air smoothly flows upward or forward and is ventilated by being actively sucked, discharged, and ventilated by a so-called Venturi action through a gap between the one tank and the hydraulic pump chamber, the hydraulic pump chamber Temperature rise can be prevented.

Further, since the hydraulic pump chamber is substantially sealed at least with respect to the outer wall of the construction machine, it is possible to cut off the operation noise of the hydraulic pump. According to the construction machine cooling structure of the present invention described in claim 6, in the configuration according to any one of claims 1 to 3 and 5, the ejector includes: an inner pipe protruding from a muffler of an engine exhaust pipe; Since there is provided an outer pipe protruding from the partition wall longer than the inner pipe around the inner pipe, and a suction gap formed between the inner pipe and the outer pipe to suck air in the engine room. In addition to the effects of any one of claims 1 to 3, the heated air in the hydraulic pump chamber is effectively discharged by the suction gap between the inner pipe and the outer pipe, and the engine External leakage of noise can be effectively suppressed.

According to the structure for cooling a construction machine according to the present invention, the ejector for sucking air in the engine room is provided. Since the suction gap can be arranged at a high-temperature portion in the engine room, claims 1 to 3,
In addition to the effect of any one of the above items 4, 6, for example, the suction gap of the ejector is arranged in a high temperature place where the flow of the heated air or the like by the equipment mounted on the engine is poor in the engine room. In this case, the ventilation of the engine room can be effectively performed.

According to an eighth aspect of the present invention, there is provided the cooling structure for a construction machine according to any one of the first, third, fourth, seventh and eighth aspects, wherein the intake port provided in the engine room has the above-mentioned structure. Claims 1, 3, 4, 7, and 7 are provided with noise suppression means for suppressing leakage of engine noise to the outside.
In addition to the effect of any one of 8 above, the noise suppression means can suppress the engine noise from leaking from the intake port to the outside.

According to the ninth aspect of the present invention, in the construction of the eighth aspect, the intake port is different from a surface of the partition of the engine room which receives air from the cooling fan. Since it is provided on the surface,
9. The engine according to claim 8, wherein the cooling air from the cooling fan does not enter the engine room through the intake port, and the cooling air from the cooling fan reaches the ejector from the intake port to the ejector. The heat radiation from the engine room can be effectively performed without disturbing the fluid path of the cooling air in the room.

According to a tenth aspect of the present invention, in the construction of any one of the first to third aspects, the intercooler for a supercharger of the engine is provided. Since the cooler is arranged outside the engine room, in addition to the effects of any one of claims 1, 3, 4, 6, and 7, without being affected by the high temperature of the engine,
The supercharging fluid of the supercharger 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 structure of a construction machine of the present invention is applied to a hydraulic shovel.

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

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

FIG. 4 is a schematic explanatory view showing a seal structure of a joint portion of each partition constituting the engine room of FIG. 1;

FIG. 5 is a schematic perspective view of a hydraulic excavator showing a flow of cooling air of a radiator and an oil cooler of FIG. 1;

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

FIG. 7 is a schematic explanatory view showing a cross section taken along line 7A-7A in FIG. 6;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lower traveling body 2 Upper revolving superstructure 2sc Side cover 2uc Upper cover 2g Inlet opening 6 Working device 8 Engine 10 Operator room 14 Counter weight 16 Hydraulic pump 17 Engine hood 17a Outlet opening 18 Radiator 18a, 18b Cooling water pipe 20 Cooling fan Reference Signs List 20a Cooling fan 22 Oil cooler 25, 27 Driving means 29 Sealing material 29a Fitting portion 29b Contact portion 30 Hydraulic oil tank 31 Fuel tank 32 Front partition plate 32a Inlet opening 36 Rear partition plate 40 Discharge opening 50a, 50b Inlet opening 100 Cooling EJ Ejector ER Engine room G Guiding means G1, G2 Guiding surface IC Intercooler K1 to K4 Seal cover M Muffler M1 Exhaust outlet end M2 Suction pipe M3 Suction gap NS Noise suppression means PR Hydraulic pump room R Looper 1 inlet W bulkhead W1 partition plate W1a rolled 設隔 wallboard Wa front bulkhead Wfb front side partition wall Wrb rear side partition wall Wc rear bulkhead

Claims (10)

[Claims] 1. An engine room surrounded by a partition, an engine disposed in the engine room, a radiator for cooling water of the engine disposed outside the engine room, and hydraulic oil for construction machinery. A cooling device having at least the radiator of an oil cooler for cooling the engine and a cooling device for an intercooler for a supercharging fluid of an engine supercharger, and a pipe for supplying cooling water cooled by the cooling device to the engine. Provided, a pipe for cooling the engine and supplying the heated cooling water to the cooler,
Heated air in the engine room is sucked out using the exhaust pressure of the engine, which is provided at a setting portion set according to the design specification of the engine room and discharged to the outside of the engine room, outside the engine room. A cooling structure for a construction machine, comprising: an ejector for discharging air to a construction machine. 2. The engine room is provided on a side of an operator room of the construction machine.
The cooling structure of the construction machine described in the above. 3. A hydraulic pump for hydraulic oil connected to the engine is provided, and any part of a side wall of a hydraulic pump chamber provided to accommodate the hydraulic pump is opened, and an outside of the engine room is provided. A cooling fan for cooling a cooler in which at least one of the coolers is disposed, and the side wall of the hydraulic pump chamber is provided by a cooling air flow of cooling air cooled by the cooling fan by the cooling fan. 3. The apparatus according to claim 1, wherein the heated air in the hydraulic pump chamber is discharged to the outside of the hydraulic pump chamber through a part where the hydraulic pump chamber is opened.
The cooling structure of the construction machine described in the above. 4. An operator room disposed at a front end of one side of the construction machine in the front-rear direction, the engine disposed behind the operator room, and a partition for accommodating the engine. One of the radiator and the cooler of the oil cooler disposed in front of the engine compartment in front of the engine room, and one of the coolers of the oil cooler, One of the cooling fans, the driving means for driving the one cooling fan, and the radiator and the oil cooler of the oil cooler disposed between the one cooler and the operator room. One of the other coolers, the other cooling fan for cooling the other cooler, a driving unit for driving the other cooling fan, and at least one for cooling the other cooler. And at least one of a fuel tank and a hydraulic oil tank provided so as to face the cooling air flow from the one cooling fan and arranged on the other side opposite to the one side. The cooling structure for a construction machine according to any one of claims 1 to 3, wherein the cooling structure is provided. 5. A cooling device for cooling at least one of the fuel tank and the hydraulic oil tank disposed on the other side opposite to the one side and at least the other cooler. Guide means for guiding the cooling air to at least one of the side of the construction machine and the upper side or the front side of at least one of the tanks on the side facing the flow of the cooling air. The cooling structure for a construction machine according to claim 4, wherein: 6. An ejector comprising: an inner pipe protruding from a muffler of an engine exhaust pipe; an outer pipe protruding from the partition wall longer than the inner pipe around the inner pipe; The cooling structure for a construction machine according to any one of claims 1 to 3, further comprising a suction gap formed between the pipe and a pipe to suck air from the engine room. 7. The engine according to claim 1, wherein a suction gap of the ejector for sucking air in the engine room is disposed at a high temperature part in the engine room.
The cooling structure for a construction machine according to any one of claims 4 and 6. 8. An intake port provided in the engine room is provided with noise suppression means for suppressing leakage of the engine noise to the outside.
The cooling structure for a construction machine according to any one of claims 7 and 8. 9. The cooling structure for a construction machine according to claim 8, wherein the intake port is provided on a surface of the partition of the engine room, the surface being different from a surface receiving the air from the cooling fan. 10. The engine according to claim 1, wherein the cooler of the intercooler for the supercharger of the engine is disposed outside the engine room. 2. The cooling structure for a construction machine according to claim 1.