JP3472161B2 - Construction machinery - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a construction machine equipped with a heat exchanger such as a radiator, an oil cooler or an intercooler.

[0002]

2. Description of the Related Art Generally, a swing type construction machine such as a hydraulic excavator is known as a construction machine. The hydraulic excavator includes a lower traveling body and an upper revolving body rotatably provided on the lower traveling body. It has and.

Further, the upper revolving structure has a revolving frame provided with a work device on the front side, a building cover provided on the revolving frame, and a left side behind the revolving frame located inside the building cover. A left-right direction of the engine, which has a horizontally mounted engine extending rightward and a counterweight attached to a rear end of the revolving frame for balancing with the working device. A heat exchanger is disposed on the side (for example, actual open flat plate 2-903).
No. 21, etc.).

Further, the building cover is composed of left and right side covers and a top cover that define a machine room on a revolving frame, and the top cover is used for maintenance work such as an engine and a heat exchanger. Is provided.
An engine cover that opens and closes the opening is attached to the top cover.

Further, the heat exchanger includes a radiator located near the engine for cooling the cooling water from the engine, an undercarriage, and an oil cooler for cooling the working oil for operating the working device. 1 heat exchanger and the first
Located on the opposite side of the engine in the thickness direction of the first heat exchanger with the heat exchanger in between, such as an intercooler for cooling compressed air from a supercharger provided in the engine. There are two heat exchangers.

Here, in the recent hydraulic excavators, the radiator and the oil cooler are increased in size in order to improve the cooling efficiency of the radiator and the oil cooler, and the upper swing body is downsized in order to improve the work performance. Therefore, the upper portions of the radiator and the oil cooler project from the top cover of the building cover and are accommodated in the engine cover.

Further, the compressed air from the supercharger is supplied to the intercooler through the air pipe, and the compressed air cooled by the intercooler is circulated toward the intake manifold of the engine through another air pipe. Since the radiator, the oil cooler, etc. are interposed between the intercooler and the engine, these air pipes are connected to the intercooler so as to get over the radiator and the oil cooler.

[0008]

By the way, in the above-mentioned prior art, each air pipe connecting the intercooler and the engine is routed so as to get over the radiator and the oil cooler. The air piping will protrude into
The height dimension of the entire heat exchange device becomes large.

For this reason, the engine cover for covering the heat exchange device also has to be raised, and this engine cover hinders the rear view from the cab, resulting in a problem that workability is deteriorated.

Further, a dustproof net is provided upstream of the radiator and oil cooler to prevent dust from accumulating on the radiator and oil cooler and lowering the cooling efficiency. The dustproof net is a heat exchange device. Since other devices are adjacent to the periphery of the device, the device is configured to be attached / detached by inserting / removing in the upward and downward directions.

However, since there is an air pipe on the upper side of the dustproof net, when attaching or detaching the dustproof net in order to clean the dustproof net, the air pipe must be removed, which requires a great deal of work. There is a problem that it will take.

The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to improve the rear visibility by removing the pipe from the upper side of the first heat exchanger.
It is to provide a construction machine capable of improving workability.

[0013]

A construction machine according to the present invention comprises a frame provided with a working device on the front side, left and right side covers and a top cover defining a machine room on the frame, A building cover in which an engine cover is provided on the upper surface cover, an engine mounted in the building cover in a horizontally placed state extending leftward and rightward on the rear side of the frame, and a balance with the working device. A counterweight attached to the rear end portion of the frame for the purpose.

Then, in order to solve the above-mentioned problems,
The feature of the configuration adopted by the invention of claim 1 is that the first heat exchanger is provided on one side of the engine in the left and right directions, and the upper tank side projects from the top cover of the building cover and is housed in the engine cover. And a second heat exchanger which is located on the opposite side of the engine with the first heat exchanger sandwiched therebetween and which is provided so as to overlap in the thickness direction of the first heat exchanger, and a top cover of the building cover. The first fluid pipe connected to the second heat exchanger through the widthwise front side of the first heat exchanger at a higher position, and the first heat exchanger at a position higher than the upper surface of the counterweight. A second fluid pipe connected to the second heat exchanger through a rear side in the width direction of the first and second fluids.
The piping should be at the front and rear positions in the width direction of the first heat exchanger.
Widthwise dimension of the entire first heat exchanger including the upper tank
It is configured to be arranged with a separation dimension larger than that of the method .

With this configuration, the upper side of the first heat exchanger can be provided without increasing the distance between the first heat exchanger and the building cover and the distance between the first heat exchanger and the counterweight. Since each fluid pipe can be eliminated from
The height dimension of the engine cover can be kept low, and the rear visibility can be improved.

According to a second aspect of the present invention, the first heat exchanger is a radiator for cooling the cooling water from the engine or an oil cooler for cooling the hydraulic oil, and the second heat exchanger is for the engine. It may be an intercooler for cooling the compressed air from the supercharger provided.

According to a third aspect of the present invention, a dustproof net is provided on the first heat exchanger so that the dustproof net can be inserted and removed in the upper and lower directions.
The fluid pipe and the second fluid pipe are arranged in front of and behind the dustproof net.

With this structure, the dust in the cooling air can be caught by the dustproof net, and the dust can be prevented from accumulating on the first heat exchanger. When cleaning the dustproof net, since there is no fluid pipe on the upper side of the first heat exchanger, the dustproof net can be easily removed by pulling it upward.

According to a fourth aspect of the present invention, the second heat exchanger is provided such that its upper portion projects from the top cover of the building cover and is accommodated in the engine cover, and the first fluid pipe is connected to the pipe connection. The port is located at a position higher than the top cover of the building cover and on the front side in the width direction of the first heat exchanger, and the pipe connection port to which the second fluid pipe is connected is located at a position higher than the top face of the counterweight. The heat exchanger is arranged on the rear side in the width direction.

With this structure, the first fluid pipe and the second fluid pipe can be linearly connected to the respective pipe connection ports, and the first fluid pipe and the second fluid pipe can be connected. Since the length dimension can be shortened, the loss when the fluid flows can be reduced. Moreover, the connection work of each fluid pipe can be facilitated.

In a fifth aspect of the invention, the second heat exchanger is the first
The connection pipe, which is arranged at an intermediate position in the height direction of the heat exchanger, and to which the first fluid pipe is connected, includes a vertical pipe portion extending upward from the second heat exchanger, and an upper end of the vertical pipe portion. And a horizontal pipe portion extending in a lateral direction so as to pass through the front side in the width direction of the first heat exchanger at a position higher than the top cover of the building cover, and the second fluid pipe is connected to the horizontal pipe portion. The connecting pipe is a vertical pipe portion extending upward from the second heat exchanger, and a vertical pipe portion extending from an upper end portion of the vertical pipe portion to a rear side in the width direction of the first heat exchanger at a position higher than the upper surface of the counter weight. It is configured by a lateral pipe portion that is bent and extends in the lateral direction so as to pass therethrough.

With this configuration, each vertical pipe section can be extended to a position higher than the top cover of the building cover and the top surface of the counterweight, and each horizontal pipe section is arranged in the width direction of the first heat exchanger. The front side and the rear side can be passed.
Accordingly, the second heat exchanger can be arranged at an intermediate position in the height direction of the first heat exchanger, and the cooling air can be efficiently applied to the second heat exchanger.

[0023]

BEST MODE FOR CARRYING OUT THE INVENTION A construction machine according to an embodiment of the present invention will be described in detail below with reference to a hydraulic excavator as an example with reference to the accompanying drawings.

First, FIGS. 1 to 5 show a first embodiment of the present invention. 1 is a lower traveling body, 2 is an upper revolving body mounted on the lower traveling body 1 so as to be rotatable, The upper revolving structure 2 is roughly constituted by a revolving frame 3, a building cover 11, an engine 15, a counterweight 19, a radiator 20, an oil cooler 21, an intercooler 24, an inflow pipe 28, and an outflow pipe 29, which will be described later.

Reference numeral 3 denotes a revolving frame forming a structure which serves as a base of the upper revolving structure. As shown in FIG. 2, the revolving frame 3 includes center frames 4 and 4 arranged substantially parallel to each other and the respective center frames 4 respectively. Side frames 5 and 5 provided on the left and right outer sides of the vehicle, and a plurality of overhanging beams 6 and 7 connecting the center frames 4 and the side frames 5 to each other.
And the like, and the lower side of the revolving frame 3 is covered with an under cover 8.

A working device 9 for excavating earth and sand and the like is provided on the front side of the revolving frame 3 so as to be able to move up and down, and a cab 10 is provided on the left side of the working device 9. Further, a working device 9 is provided at the rear end of the revolving frame 3.
A counterweight 19 is attached for balancing.

Reference numeral 11 denotes a building cover that defines a machine room on the swivel frame 3, and the building cover 11 extends in the front-rear direction along the side frames 5 and 5, as shown in FIGS. 2, 3, and 4. Left and right side covers 12, 1 erected upward
2 and an upper surface cover 13 extending horizontally in the upper side of each side cover 12 and having an opening 13A formed in the center thereof. Each side cover 12 has an air circulation port 12A formed of a plurality of slits. Are provided respectively.

Reference numeral 14 is an engine cover rotatably attached to the top cover 13 of the building cover 11, and the engine cover 14 is the opening 13 of the top cover 13.
It opens and closes A.

Reference numeral 15 denotes an engine which is provided inside the building cover 11 and which is mounted on the rear side of each center frame 4 in a horizontally installed state extending in the left and right directions. A cooling fan 16 is mounted on the left side of the engine 15. On the right side, a hydraulic pump 17 that is driven by the engine 15 and supplies hydraulic oil (pressure oil) to each actuator (not shown) provided in the lower traveling body 1, the working device 9 and the like is attached. There is.

The cooling fan 16 is rotationally driven by the engine 15 so that the side cover 1
The outside air is sucked into the building cover 11 through the air circulation port 12A of 2 and the outside air is used as cooling air to be described later in the intercooler 2
4, the oil cooler 21, and the radiator 20 are sequentially supplied.

Reference numeral 18 denotes a turbocharger provided in the engine 15. The turbocharger 18 has a drive-side turbine chamber connected to the exhaust manifold and a muffler, and a driven-side turbine chamber which is described later with an inflow pipe 28. And an intake hose from the air cleaner (neither shown).
The turbocharger 18 rotates the turbine using the exhaust gas of the engine 15, compresses the air sucked from the air cleaner, and supplies the compressed air to the intake manifold of the engine 15 via the intercooler 24 and the like.

Reference numeral 19 denotes a counterweight mounted on the rear end of each center frame 4 of the revolving frame 3 and balancing with the working device 9. The counterweight 19 is shown in FIG.
As shown in FIG. 5, the front surface 19A is formed substantially flat.
A circumferential surface 19B formed in an arc shape from both left and right side surfaces to the rear surface, a top surface 19C that is substantially flush with the top cover 13 of the building cover 11, and the undercover 8 of the revolving frame 3. It has a lower surface 19D that forms the same plane.

Numeral 20 is a first provided inside the building cover 11.
Which is a radiator forming a heat exchanger of
It is bolted onto the overhanging beams 6, 6 of the swivel frame 3 at a position adjacent to the left side of the cooling fan 16.
In the radiator 20, the upper tank 20A and the lower tank 20B are connected to a water jacket (not shown) of the engine 15 via piping, whereby heat of engine cooling water circulated with the engine 15 is radiated. The heat is exchanged in the portion 20C and discharged into the cooling air to cool the engine cooling water.

Reference numeral 21 denotes an oil cooler which is mounted on the left side of the radiator 20 so as to be stacked thereon, and which constitutes a first heat exchanger. The oil cooler 21 includes an upper tank 21A and a lower traveling body 1,
The lower tank 21B is connected to a return pipe from each actuator of the work device 9 and the like, and the lower tank 21B is connected to a hydraulic oil tank (neither is shown) via the pipe. This allows
The oil cooler 21 radiates the heat of the hydraulic oil at the heat dissipation portion 21C to cool the hydraulic oil.

Here, the radiator 20 and the oil cooler 2
A large one is used to increase the cooling efficiency of engine cooling water and hydraulic oil. Further, the upper swing body 2 (building cover 11) is downsized in order to improve work performance. As a result, the radiator 20 and the oil cooler 21 are housed in the engine cover 14 with their upper tanks 20A, 21A side (upper part) protruding from the opening 13A formed in the top cover 13 of the building cover 11.

Reference numeral 22 designates a dustproof net provided on the left side of the oil cooler 21 in such a manner that relatively large dust is accumulated in the heat radiating portion 21C of the oil cooler 21 and the heat radiating portion 20C of the radiator 20. The guide members 23, 23 having a substantially L-shaped cross section, which are provided at both ends in the width direction of the oil cooler 21 so as to extend upward and downward.
Held in between. The dustproof net 22 is inserted and removed in the upward and downward directions along each guide member 23, and is pulled out upward when removing the captured dust.

Reference numeral 24 is an oil cooler 21 and a radiator 20.
An intercooler as a second heat exchanger, which is located on the opposite side of the engine 15 with the oil sandwiching therebetween in the thickness direction of the oil cooler 21. The intercooler 24 is a rear side in the width direction of the oil cooler 21 ( An inflow side tank 25 located on the counterweight 19 side), an outflow side tank 26 located on the width direction front side of the oil cooler 21 (cab 10 side),
It is provided between each of the tanks 25 and 26, and is roughly constituted by a plurality of thin tubes and a heat radiating portion 27 including heat radiating fins.

An arcuate convex portion 25A is provided on the upper side of the inflow side tank 25 so as to project toward the rear side (counterweight 19 side), and the arcuate convex portion 25A extends toward the engine 15 side. A connection pipe 25B as a pipe connection port forming a part of the inflow pipe 28 is integrally provided. on the other hand,
An arcuate convex portion 26A is provided on the upper side of the outflow side tank 26 so as to project toward the front side (cab 10 side).
A connection pipe 26B, which extends toward the engine 15 side and forms a part of the outflow pipe 29, is integrally provided as a pipe connection port.

Here, the connection pipe 25 of the inflow side tank 25
B and the connection pipe 26B of the outflow side tank 26 are not shown in FIG.
As shown in FIG. 4, including the upper tanks 20A and 21A
Radiator 20 is disposed with a large separation dimension than the width dimension of the entire oil cooler 21 Te. Accordingly, when the intercooler 24 is attached to the oil cooler 21, the connection pipe 25B is arranged on the rear side in the width direction of the radiator 20 and the oil cooler 21, and the connection pipe 26B is arranged on the front side in the width direction of the radiator 20 and the oil cooler 21. It

Intercooler 24 constructed in this way
Is bolted to the upper side of the oil cooler 21, and the arcuate convex portion 25A of the inflow side tank 25 is located at a position higher than the upper surface 19C of the counterweight 19 and the upper surface 19C.
And the arcuate convex portion 2 of the outflow side tank 26, which is arranged close to the
6A is arranged at a position higher than the top cover 13 of the building cover 11 and close to the top cover 13.

The intercooler 24 is the engine 1
The air compressed by the turbocharger 18 of No. 5 flows into the inflow side tank 25 through the inflow pipe 28 described later and is circulated in the heat radiating section 27, thereby cooling the compressed air and from the outflow side tank 26. It is supplied to the intake manifold of the engine 15 through the outflow pipe 29.

Reference numeral 28 is an inflow pipe which forms a second fluid pipe connecting the turbocharger 18 of the engine 15 and the intercooler 24. The inflow pipe 28 has a rubber hose 28 at one end side.
It is connected to the turbine chamber on the driven side of the turbocharger 18 via A, and the other end is connected to the connection pipe 25B of the inflow side tank 25 via a rubber hose 28A. The inflow pipe 28 is routed so as to pass through the radiator 20 and the oil cooler 21 in the width direction at a position higher than the upper surface 19C of the counterweight 19.

Reference numeral 29 is an outflow pipe forming a first fluid pipe connecting the intercooler 24 and the engine 15. One end of the outflow pipe 29 is connected to a connection pipe 26B of the outflow side tank 26 via a rubber hose 29A. The other end side is connected to the intake manifold of the engine 15. The outflow pipe 29 is located on the opposite side of the inflow pipe 28, and is arranged so as to pass through the radiator 20 and the oil cooler 21 in the width direction front side at a position higher than the upper surface cover 13 of the building cover 11.

The hydraulic excavator according to the present embodiment has the above-mentioned structure. When the engine 15 drives the hydraulic pump 17, the hydraulic pump 17 applies pressure to the actuators of the undercarriage 1 and the working device 9. Oil is supplied and the lower traveling body 1 is caused to travel, or the working device 9 is raised and lowered to perform excavation work of earth and sand.

On the other hand, when the engine 15 is in operation, the cooling fan 16 is rotationally driven by the engine 15 and external air is sucked into the building cover 11 as cooling air, and this cooling air is intercooler 24, oil cooler 21, radiator 20. Are sequentially supplied to cool intake air, hydraulic oil, and engine cooling water.

A large amount of dust is mixed in the cooling air, but this dust can be caught by the dustproof net 22, and the accumulation of dust reduces the cooling efficiency of the oil cooler 21 and the radiator 20. Can be prevented. Moreover, when removing the dust trapped in the dustproof net 22, the dustproofing work can be easily performed by pulling the dustproof net 22 upward.

As described above, according to the present embodiment, the inflow pipe 28 connecting the engine 15 and the intercooler 24 is passed through the radiator 20 and the oil cooler 21 in the widthwise rear side at a position higher than the upper surface 19C of the counterweight 19. The radiator 20 and the oil cooler 2 are arranged at a position where the outflow pipe 29 is higher than the top cover 13 of the building cover 11.
It is configured to be routed through the front side in the width direction of No. 1.

Thus, the inflow pipe 28 and the outflow pipe 29 can be routed without increasing the distance between the radiator 20, the oil cooler 21 and the building cover 11, and the distance between the radiator 20, the oil cooler 21 and the counterweight 19. Therefore, the front and rear dimensions of the upper revolving structure 2 can be suppressed to be small, and the revolving radius of the upper revolving structure 2 can be reduced to improve work performance.

Moreover, the radiator 20 and the oil cooler 2
By removing the inflow pipe 28 and the outflow pipe 29 from the upper side of 1, the height dimension of the engine cover 14 can be suppressed to a low level, so that the rear view from the cab 10 can be improved, and workability and safety can be improved. Can be increased.

Further, the inflow pipe 28 is connected to the counterweight 1
9 and the outflow pipe 29 is arranged at a position higher than the building cover 11, it is possible to increase the width dimension of the intercooler 24 to the same extent as the radiator 20 and the oil cooler 21. it can. As a result, the cooling efficiency of the intercooler 24 can be improved, and the performance of the engine 15 can be improved.

Further, since the intercooler 24 is arranged on the upper side of the oil cooler 21, the inflow path formed by the connection pipe 25B of the inflow side tank 25 and the inflow pipe 28, the connection pipe 26B of the outflow side tank 26 and the outflow. The outflow path including the pipe 29 can be shortened. As a result, the flow resistance of the air can be reduced to improve the performance of the engine 15, and the cost can be reduced and the workability at the time of maintenance can be improved.

On the other hand, when cleaning the dustproof net 22, there is no obstructive pipe above the dustproof net 22.
The dustproof net 22 can be easily pulled out, the cleaning work of the dustproof net 22 can be facilitated, and the workability can be improved.

Next, FIGS. 6 and 7 show a second embodiment of the present invention. The feature of this embodiment is that the second heat exchanger is in the height direction of the first heat exchanger. Placed in the middle position of
The second heat exchanger and the first and second fluid pipes are connected to each other via connection pipes. In addition, in the present embodiment, the same components as those in the first embodiment described above are designated by the same reference numerals, and the description thereof will be omitted.

Reference numeral 31 is an intercooler according to the present embodiment, which is used in place of the intercooler 24 according to the first embodiment. The intercooler 31 is provided on the rear side similarly to the intercooler 24 according to the first embodiment. An inflow side tank 32 located, an outflow side tank 33 located on the front side,
It is provided between each of the tanks 32 and 33, and is generally constituted by a plurality of thin tubes and a heat radiating section 34 including heat radiating fins.

However, the intercooler 31 according to the present embodiment is arranged at an intermediate position in the height direction of the oil cooler 21, and the connection pipe 35 of the inflow side tank 32 is correspondingly arranged.
The intercooler 24 according to the first embodiment is characterized in that the connection pipe 36 of the outflow side tank 33 is elongated.
Is different from

Reference numeral 35 denotes an inflow side connection pipe integrally provided at the upper end of the inflow side tank 32.
As shown in FIG. 7, a vertical piping portion 35A extending upward from the upper end surface of the inflow side tank 32, and a horizontal piping portion bent from the upper end portion of the vertical piping portion 35A to the rear side and then to the engine 15 side. And part 35B. Then, the tip end side of the horizontal piping portion 35B is provided on the upper surface 19 of the counterweight 19.
Oil cooler 21, radiator 20 at a position higher than C
The inflow pipe 28 is disposed on the rear side in the width direction of the above, and the inflow pipe 28 is connected to the tip end side of this horizontal pipe 35B via a rubber hose 28A.

Reference numeral 36 is an outflow-side connection pipe integrally provided at the upper end of the outflow-side tank 33.
The vertical pipe portion 3 extending upward from the upper end surface of the outflow side tank 33
6A, and a horizontal piping portion 36B which is bent from the upper end of the vertical piping portion 36A to the front side and then bent and extended to the engine 15 side. The tip end of the horizontal piping portion 36B is arranged at a position higher than the upper surface cover 12 of the building cover 11 and on the front side in the width direction of the oil cooler 21 and the radiator 20, and the rubber hose 29 is provided on the tip end side of the horizontal piping portion 36B.
The outflow pipe 29 is connected via A.

Thus, in the present embodiment having such a configuration as well, it is possible to obtain substantially the same operational effects as in the first embodiment described above, but in particular, in the present embodiment, the intercooler 31 is provided. Since the oil cooler 21 can be arranged at an intermediate position in the height direction, the cooling air can be efficiently applied to the intercooler 31 to cool the air, and the performance of the engine 15 can be further improved.

In each of the embodiments, the intercoolers 24 and 31 are described as an example of the second heat exchanger, but the present invention is not limited to this. For example, an air conditioner is used as the second heat exchanger. The capacitor or the like may be applied.

Further, in each of the embodiments, the turbocharger 1
By arranging 8 on the rear side of the engine 15, the outflow pipe 29 is arranged on the front side (cab 10 side) as the first fluid pipe, and the inflow pipe 28 is arranged on the rear side (counterweight 19 side) as the second fluid pipe. ) Has been described as an example. However, the present invention is not limited to such an arrangement. When the arrangement of the engine 15 is switched between left and right, that is, when the turbocharger 18 is arranged on the front side, the first fluid pipe is provided. The inflow pipe 28 serving as the second fluid pipe may be disposed on the front side, and the outflow pipe 29 serving as the second fluid pipe may be disposed on the rear side.

Further, in the embodiment, the hydraulic excavator has been described as an example of the construction machine, but the present invention is not limited to this, and is applied to other construction machines such as a wheel loader, a hydraulic crane, and a bulldozer. You may.

[0062]

As described in detail above, according to the invention of claim 1 .
The construction machine is provided on one side of the engine in the left and right directions, and has a first heat exchanger housed in the engine cover with the upper tank side protruding from the top cover of the building cover,
The second, which is located on the opposite side of the engine provided to overlap in the thickness direction of the first heat exchanger to sandwich the first heat exchanger
A heat exchanger, the first fluid pipe connected to the second heat exchanger through the width direction front side of the first heat exchanger at a position higher than the top cover of the housing cover, counter A second fluid pipe connected to the second heat exchanger through a rear side in the width direction of the first heat exchanger at a position higher than the upper surface of the weight, and the first and second Fluid piping is the first
At the front and rear positions in the width direction of the heat exchanger, the upper
Larger than the overall width dimension of the first heat exchanger including the
It is configured to be arranged with a separation dimension . This makes it possible to eliminate each fluid pipe from the upper side of the first heat exchanger without increasing the distance between the first heat exchanger and the building cover and the distance between the first heat exchanger and the counterweight. Therefore, the height dimension of the engine cover can be suppressed to be low, the rear visibility can be improved, and workability and safety can be improved. According to the invention of claim 2,
For example, the first heat exchanger cools the cooling water from the engine
An oil cooler that cools the radiator or hydraulic oil,
The second heat exchanger is the pressure from the supercharger installed in the engine.
Can be an intercooler for cooling compressed air
It

According to the third aspect of the present invention, since the dust in the cooling air can be caught by the dustproof net, it is possible to prevent the dust from accumulating on the first heat exchanger, and the first heat exchanger is used. The cooling efficiency can be increased. Also, when cleaning the dust captured by the dustproof net, there is no fluid piping on the upper side of the first heat exchanger, so the dustproof net can be easily removed by pulling it up. It is possible to improve the property.

According to the invention of claim 4, the second heat exchanger is provided with the upper part thereof protruding from the building cover and accommodated in the engine cover, and the first fluid pipe is connected to the pipe connection. mouth, located in the width direction front side of the first heat exchanger at a position higher than the top cover of the housing cover, connection port in which the second fluid line is connected, at a position higher than the upper surface of the counterweight Since it is arranged on the rear side in the width direction of the first heat exchanger, the first fluid pipe and the second fluid pipe can be linearly connected to the respective pipe connection ports. pipe, by shortening the length of the second fluid piping, to reduce the loss when the fluid flows, thereby improving the cooling efficiency. Further, the connecting operation of the fluid piping can be facilitated, improving the assembling workability, it is possible to reduce the cost.

According to the invention of claim 5, the second heat exchanger is arranged at an intermediate position in the height direction of the first heat exchanger, and
The connecting pipe to which the fluid pipe is connected and the connecting pipe to which the second fluid pipe is connected include a vertical pipe portion extending upward from the second heat exchanger, and a building cover from the upper end of the vertical pipe portion. The top cover and the counter weight should be placed at a high position near the top surface first.
The second heat exchanger has a height equal to that of the first heat exchanger. Can be placed in the middle position of the direction, and the cooling air can be efficiently applied to the second heat exchanger,
The cooling performance of the second heat exchanger can be improved.

[Brief description of drawings]

FIG. 1 is a front view showing a hydraulic excavator applied to a first embodiment of the present invention.

FIG. 2 shows an engine, a heat exchange device, etc., as indicated by arrows II-II in FIG.
It is sectional drawing expanded and shown from a direction.

FIG. 3 is a plan view of a main part showing a main part inside a building cover in a state where an engine cover is omitted on a rear side of an upper swing body.

FIG. 4 is an external perspective view showing how the inflow pipe and the outflow pipe are routed together with an engine, an intercooler, a counterweight, and the like.

[Fig. 5] Building cover, counterweight, radiator,
FIG. 5 is a cross-sectional view of an oil cooler, an intercooler, and the like as viewed in the direction of the arrow VV in FIG. 2.

FIG. 6 is a sectional view showing an intercooler according to a second embodiment of the present invention together with a building cover, a counter weight, an oil cooler and the like.

FIG. 7 is an external perspective view showing the intercooler in FIG. 6 in an enlarged manner from the engine side.

[Explanation of symbols]

3 swivel frames 9 Working device 11 building cover 12 Side cover 13 Top cover 14 engine cover 15 engine 18 turbocharger 19 counter weight 19A front 19B circumference 19C upper surface 19D bottom surface 20 radiator (first heat exchanger) 21 Oil cooler (first heat exchanger) 22 Dustproof net 24,31 intercooler (second heat exchanger) 25,32 Inflow side tank 25B, 26B connection pipe (pipe connection port) 26,33 Outflow side tank 28 Inflow piping (second fluid piping) 29 Outflow pipe (first fluid pipe) 35, 36 connection piping 35A, 36A Vertical piping (vertical piping) 35B, 36B Horizontal piping (horizontal piping)

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Koji Kawasaki, 650 Jinritsu-cho, Tsuchiura-shi, Ibaraki Hitachi Construction Machinery Co., Ltd. Tsuchiura Plant (56) Reference JP 10-103065 (JP, A) JP 8 -268091 (JP, A) JP-A-9-125972 (JP, A) Actual development 7-17923 (JP, U) Actual development 2-90321 (JP, U) (58) Fields investigated (Int.Cl) . ⁷ , DB name) F01P 11/10 B60K 11/04 F02B 29/04

Claims (5)

(57) [Claims] 1. A frame provided with a working device on the front side, left and right side covers and a top cover that define a machine room on the frame, and an engine cover provided on the top cover. A building cover, an engine mounted in the building cover in a horizontally installed state extending leftward and rightward on the rear side of the frame, and attached to a rear end portion of the frame to balance with the working device. a construction machine and a resulting counterweight, left of the engine, provided on one side of the right, upper
A first heat exchanger housed in the engine cover tank side protrudes from the top cover of the housing cover, the first across the heat exchanger positioned on the opposite side of the engine the first wherein in a second heat exchanger provided to overlap in the thickness direction of the heat exchanger, a position higher than the top cover of the front Symbol housing cover first
Said first fluid pipe connected to the second heat exchanger through the width direction front side of the heat exchanger, at a position higher than the upper surface of the front SL counterweight first
A second fluid pipe connected to the second heat exchanger through a rear side in the width direction of the heat exchanger , the first and second fluid pipes of the first heat exchanger. Width direction
The first heat including the upper tank at the front and rear positions of
With a clearance larger than the width of the entire exchanger
A construction machine characterized by being arranged . 2. The first heat exchanger is a radiator that cools cooling water from the engine or an oil cooler that cools hydraulic oil, and the second heat exchanger is a supercharger provided in the engine. The construction machine according to claim 1, which is an intercooler for cooling compressed air from the vehicle. 3. A dustproof net is provided on the first heat exchanger so that the dustproof net can be inserted and pulled out upward and downward, and the first fluid pipe and the second fluid pipe are in front of each other with the dustproof net sandwiched therebetween. ，
The construction machine according to claim 1 or 2, which is arranged later. 4. The second heat exchanger is provided in a state where an upper portion thereof projects from an upper surface cover of the building cover and is accommodated in an engine cover, and a pipe connection port to which the first fluid pipe is connected is It is arranged at a position higher than the upper surface cover of the building cover on the width direction front side of the first heat exchanger, and the pipe connection port to which the second fluid pipe is connected is at a position higher than the upper surface of the counter weight. The construction machine according to claim 1, wherein the construction machine is arranged on the rear side in the width direction of the first heat exchanger. 5. The second heat exchanger is arranged at an intermediate position in the height direction of the first heat exchanger, and the connecting pipe to which the first fluid pipe is connected is the second heat exchanger. From a vertical pipe portion extending upward from the upper end of the vertical pipe portion at a position higher than the top cover of the building cover, and bent in the lateral direction so as to pass through the widthwise front side of the first heat exchanger. A connecting pipe to which the second fluid pipe is connected, the vertical pipe portion extending upward from the second heat exchanger;
And a horizontal pipe portion extending in a lateral direction so as to pass from a widthwise rear side of the first heat exchanger at a position higher than an upper surface of the counterweight from an upper end portion of the vertical pipe portion. The construction machine according to claim 1, 2, or 3.