JP2000120439A - Construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance operating performance without setting back a counter weight by connecting a pipeline with a heat exchanger. SOLUTION: It is so constituted that an inflow pipeline 28 connecting the turbo-super charger 16 of an engine 14 with the inflow side tank 25 of an inter- cooler 24 is provided by making use of a counterweight 17. By this constitution, since the line can be eliminated out of a space among a radiator 20, an oil cooler 21 and the counterweight 17, the counterweight 17 can be disposed while being moved to a place close to the radiator 20 and the oil cooler 21, the turning radius of an upper turning body can be made small by making the longitudinal length of the aforesaid body short, so that the operating performance of a hydraulic shovel can thereby be enhanced. In addition, the pipeline can be eliminated out of the upper surfaces of the radiator 20 and the oil cooler 21, rear visibility can thereby be well improved with an engine cover 13 made lower.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art In general, a swing type construction machine such as a hydraulic excavator is known as a construction machine. This hydraulic excavator is composed of a lower traveling body and an upper revolving body rotatably provided on the lower traveling body. And

[0003] The upper revolving superstructure includes a revolving frame provided with a working device on a front side, and a left and a right side on a rear side of the revolving frame.
An engine mounted in a horizontal state extending rightward, a counterweight attached to a rear end of the revolving frame for balancing with the working device, and provided on one of left and right sides of the engine. (For example, Japanese Utility Model Application Laid-Open No. 2-90321).
No.).

Here, the heat exchanger includes a radiator which is located near the engine and cools cooling water from the engine, an undercarriage, and an oil cooler which cools hydraulic oil for operating a working device. A first heat exchanger;
And a second heat exchanger such as an intercooler that cools the compressed air from the supercharger provided in the engine. An inflow pipe and an outflow pipe are connected to the first heat exchanger and the second heat exchanger, respectively, and these pipes are routed around each heat exchanger and the engine.

[0005]

In the hydraulic excavator according to the prior art described above, since a plurality of heat exchangers are provided, an inflow pipe connected to these heat exchangers,
Many pipes such as outflow pipes are arranged around the engine, heat exchanger, and the like. For this reason, space around these pipes is required around the engine, the heat exchanger, and the like.

Therefore, it is conceivable to increase the space around the engine and the heat exchanger by moving the counterweight backward, but in this case, the upper revolving structure is moved by the amount of movement of the counterweight backward. Since the turning radius (turning radius) at the time of turning increases, there is a problem that the work performance of the hydraulic shovel decreases.

[0007] 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 connect a pipe to a heat exchanger without moving a counterweight backward, thereby improving work performance. To provide improved construction machinery.

[0008]

According to the present invention, there is provided a construction machine having a frame provided with a working device on a front side, an engine mounted on a rear side of the frame in a laterally extending left and right direction, and A counterweight attached to the rear end of the frame to balance with the working device;
A first heat exchanger provided on one side in the left and right directions of the engine; and a first heat exchanger located on the opposite side of the engine with the first heat exchanger interposed therebetween. And a second heat exchanger provided in the thickness direction.

[0009] In order to solve the above-mentioned problems, a first aspect of the present invention is provided.
The invention employs a first fluid pipe connected to the second heat exchanger through the widthwise front side of the first heat exchanger and a counterweight, and And a second fluid pipe connected to the second heat exchanger through the rear side in the width direction of the first heat exchanger.

With this configuration, even when the second fluid pipe is connected to the second heat exchanger through the widthwise rear side of the first heat exchanger, the first heat exchanger and the counterweight are connected. Since no space is required between the first heat exchanger and the space between the first heat exchanger and the first heat exchanger, the counterweight can be disposed close to the widthwise rear side of the first heat exchanger, thereby shortening the length of the vehicle body of the construction machine. be able to.

The first heat exchanger may be a radiator for cooling water from the engine or an oil cooler for cooling hydraulic oil, and the second heat exchanger may be provided in the engine. An intercooler for cooling the compressed air from the supercharger may be used.

According to a third aspect of the present invention, a second heat exchanger and a second heat exchanger are provided.
The connection between the inflow side and the outflow side of the fluid pipe is made using separate pipes. As a result, the second
And the second fluid pipe can be easily connected via the pipe.

According to a fourth aspect of the present invention, the counter weight is
It is constituted by a box formed in a hollow and a heavy object filled in the box, and a second fluid pipe is provided on the left inside the box.
It is constituted by a pipe member which is provided extending in the right direction, and whose both ends are opened as an inflow side connection port and an outflow side connection port on the front plate of the box body.

[0014] With this configuration, almost the entire pipe member forming the second fluid pipe can be accommodated in the box of the counterweight, and the counterweight is moved to a position close to the first heat exchanger. Can be arranged.

According to a fifth aspect of the present invention, the counter weight is:
The second fluid pipe is constituted by a hollow box body and a heavy object filled in the box body, and the second fluid pipe is provided on the outer surface of the front plate of the box body so as to be spaced apart in the left and right directions. A communication path is provided between the side connection port, the outflow side connection port, and the left and right directions inside the box body, and communicates between the inflow side connection port and the outflow side connection port with the inner surface of the front plate. And a frame member.

With this configuration, the second fluid pipe can be formed by fixing the frame member to the inner surface of the front plate of the box over the inflow side connection port and the outflow side connection port. Also, almost the entire second fluid pipe can be accommodated in the counterweight box, and the counterweight can be arranged at a position close to the first heat exchanger.

According to a sixth aspect of the present invention, the counter weight is
It is constituted by a box formed in a hollow and a heavy object filled in the box, and a second fluid pipe is defined between an upper surface plate of the box and an upper surface of the heavy object. A space portion, provided on the outer surface of the front plate of the box so as to be separated leftward and rightward,
It is constituted by an inflow side connection port and an outflow side connection port communicating with the space.

With this configuration, when the box is filled with a heavy object, the second fluid is utilized by utilizing the space defined between the upper surface of the heavy object and the upper plate of the box. Piping can be formed. Also, almost the entire second fluid pipe can be accommodated in the counterweight box, and the counterweight can be arranged at a position close to the first heat exchanger.

According to a seventh aspect of the present invention, the counterweight is formed of a casting having at least a front surface, a rear surface, an upper surface, and a lower surface, and the second fluid pipe has a hollow inside the counterweight formed as a casting. The hollow passage is formed so as to extend rightward and has both ends opened at the front surface as an inflow-side connection port and an outflow-side connection port.

[0020] With this configuration, the hollow passage forming the second fluid pipe can be formed together when the counterweight is cast, and the second fluid pipe can be easily provided. . Further, almost the entire second fluid pipe can be accommodated within the outer dimensions of the counterweight, and the counterweight can be disposed at a position close to the first heat exchanger.

According to an eighth aspect of the present invention, the counterweight is formed by a casting having at least a front surface, a rear surface, an upper surface and a lower surface, and the second fluid pipe extends leftward and rightward on the front surface of the counterweight and is concave. A recessed groove is provided, and a passage is defined between the recessed groove and a closing plate provided with an inflow-side connection port and an outflow-side connection port communicating with the passage on both left and right directions. I did it.

With this configuration, the second fluid pipe can be easily provided by fixing the closing plate so as to cover the concave groove formed on the front surface when the counterweight is formed. Moreover, almost the entire second fluid pipe can be accommodated within the outer dimensions of the counterweight, and the counterweight can be arranged at a position close to the first heat exchanger.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A construction machine according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings, taking a hydraulic shovel as an example.

First, FIGS. 1 to 4 show a first embodiment of the present invention, wherein 1 is a lower traveling body, 2 is an upper revolving body mounted on the lower traveling body 1 so as to be pivotable, The upper revolving unit 2 includes a revolving frame 3 forming a structure, a cab 4 provided on the front left side of the revolving frame 3, and a counterweight 1 described later attached to the rear side of the revolving frame 3.
The work device 5 for excavating soil and the like is provided in front of the revolving frame 3.

As shown in FIG. 2, the revolving frames 3 are provided on center frames 6 and 6 (only one is shown) disposed substantially in parallel, and are provided on the left and right sides of the respective center frames 6. Side frames 7, 7 (only one is shown)
And a plurality of overhanging beams 8 connecting the respective center frames 6 and the side frames 7. The lower side of the revolving frame 3 is covered with an under cover 9.

A building cover 10 is provided on the revolving frame 3 and defines a machine room on the revolving frame 3. The building cover 10 extends in the front-rear direction along the side frames 7, 7 and stands upright. Provided side covers 11, 11;
The upper surface cover 12 extends in the horizontal direction so as to cover the upper end side of each side cover 11 and has an opening 12A formed at the center.

Reference numeral 13 denotes an engine cover provided on the top cover 12, which opens and closes an opening 12A, and is rotatably attached to the top cover 12.

Reference numeral 14 denotes an engine provided in the building cover 10 and mounted on the rear side of each center frame 6 so as to extend horizontally to the left and right. A cooling fan 15 is mounted on the left side of the engine 14. On the right side, a hydraulic pump (not shown) is attached. Here, the cooling fan 1
Numeral 5 is that which is driven to rotate by the engine 14 to suck outside air into the building cover 10 and supply this outside air as cooling air to the intercooler 24, the oil cooler 21, and the radiator 20 sequentially.

Reference numeral 16 denotes a turbocharger 16 provided in the engine 14. The turbocharger 16 has a drive-side turbine chamber connected to an exhaust manifold and a muffler, and a driven-side turbine chamber connected to an inflow pipe described later. 28 and an intake hose from the air cleaner (both not shown). The turbocharger 16 supplies the compressed air to the intake side of the engine 14 via the intercooler 24 and the like by being rotationally driven by the exhaust of the engine 14.

Reference numeral 17 denotes a counterweight which is attached to the rear end of each center frame 6 of the revolving frame 3 and balances with the working device 5.
As shown in FIG. 4, a substantially flat front plate 18 is formed.
A, an arc-shaped rear plate 18B protruding rearward, left,
The weight cover 18 which is a hollow body formed by the right side plates 18C, 18C, the upper surface plate 18D, and the lower surface plate 18E, and concrete, cutting metal pieces (cutting chips), etc. filled in the weight cover 18 And a weight 19. Mounting holes 18A1 and 18A1 are formed in the front plate 18A of the weight cover 18 at positions near the upper side and separated in the left and right directions.

Numeral 20 denotes a radiator serving as a heat exchanger provided in the building cover 10. The radiator 20 is located at a position adjacent to the left side of the cooling fan 15, and as shown in FIG. , 8 with bolts. The radiator 20 is connected to a water jacket (not shown) of the engine 14, exchanges heat of engine cooling water circulating with the engine 14, and releases the heat into cooling air, and the engine cooling water Is to cool.

Reference numeral 21 denotes an oil cooler which is a first heat exchanger and is mounted on the left side of the radiator 20 so as to form a first heat exchanger. The oil cooler 21 is a return pipe (shown in FIG. The cooling oil is cooled by releasing heat of the hydraulic oil supplied through the hydraulic oil tank (not shown).

Numeral 22 denotes a dustproof net provided on the left side of the oil cooler 21. The dustproof net 22 removes relatively large foreign matter such as dust from the oil cooler 21 and the radiator 20.
Oil cooler 2
1 is held between guide members 23 extending substantially upward and downward at both ends in the front and rear directions (width direction), each having a substantially L-shaped cross section.

Reference numeral 24 denotes an oil cooler 21, a radiator 20
And an intercooler as a second heat exchanger which is located on the opposite side of the engine 14 with the oil cooler 21 disposed in the thickness direction of the oil cooler 21, and the intercooler 24 is provided on the rear side (counter weight 17 side). Inflow side tank 25 located
And the outflow side tank 26 located on the front side (cab 4 side).
And a heat radiating portion 27 provided between the tanks 25 and 26 and composed of a plurality of thin tubes and heat radiating fins. The inflow-side tank 25 is provided with an inflow-side connection pipe 25A extending rearward.
A is connected to an outflow side connection port 28B of an inflow pipe 28 described later.

Further, the outflow-side tank 26 protrudes forward from the oil cooler 21 and the radiator 20, and the outflow-side connection pipe 26 A extending toward the engine 14 from the widthwise front side of the oil cooler 21 and the radiator 20 to the protruding portion. Is provided.

The intercooler 24 is connected to the engine 1
The air compressed by the turbocharger 16 of No. 4 flows into the inflow-side tank 25 through the inflow pipe 28, and the compressed air is cooled by flowing through the radiator 27. Is supplied from the outflow side tank 26 to the intake manifold of the engine 14 through the outflow pipe 29.

Reference numeral 28 denotes an inflow pipe which forms a second fluid pipe connecting the turbocharger 16 of the engine 14 and the intercooler 24. The inflow pipe 28 has an outer shape of the counterweight 17 as shown in FIG. The weight cover 18 is provided to extend leftward and rightward along the inner surface of the front plate 18A of the weight cover 18. The left and right sides of the inflow pipe 28 are bent forward, and penetrate through the respective mounting holes 18A1 of the front plate 18A to form an inflow side connection port 28A and an outflow side connection port 28B.

As described above, the inflow pipe 28 is provided with a substantially U-shaped bent pipe member using the counterweight 17, so that almost all portions except the inflow side connection port 28A and the outflow side connection port 28B are provided. Is the counter weight 1
7 is within. The inflow pipe 28 has both sides inserted in the mounting holes 18A1 of the front plate 18A.
It is fixed to the front plate 18A by fixing means such as welding.

The inflow pipe 28 has an inflow side connection port 28A located on the right side, which is the upstream side, and a rubber hose 3 described later.
0, which is connected to the turbine chamber on the driven side of the turbocharger 16 and is located on the downstream side on the left side, the outflow side connection port 28
B is a rubber hose 3 connected to the connection pipe 25A of the inflow side tank 25.
0. Thereby, the inflow pipe 28
Are arranged so as to pass rearward in the width direction of the radiator 20 and the oil cooler 21.

An outlet pipe 29 is a first fluid pipe connecting the intercooler 24 and the engine 14. The outlet pipe 29 has an upstream side connected to a connection pipe 26 A of the outlet tank 26 via a rubber hose 30. Engine 1 at the end
4 intake manifold. The outflow pipe 29 is located on the opposite side of the inflow pipe 28 and is routed through the radiator 20 and the oil cooler 21 in the widthwise front side.

Are interposed between the turbocharger 16 and the inflow-side connection port 28A of the inflow pipe 28.
4, the connection pipe 25A of the inflow side tank 25 and the inflow pipe 28
Of the outflow side tank 26 and the outflow pipe 29 are connected to each other by a plurality of rubber hoses provided separately from these members. The rubber hose 30 is formed as a flexible tube. The rubber hose 30 is deformed in accordance with the displacement even when a relative displacement occurs between the connection pipe 25A of the intercooler 24 and the inflow-side connection port 28A of the inflow pipe 28 during, for example, work or assembly. This deviation can be tolerated.

The hydraulic shovel according to the present embodiment has the above-described configuration. When the hydraulic pump is driven by the engine 14, hydraulic oil is supplied from the hydraulic pump to the actuators of the lower traveling unit 1 and the working device 5. Supply,
The undercarriage 1 is run, and the work device 5 is raised and lowered to perform excavation work on earth and sand.

On the other hand, when the engine 14 is operating, the cooling fan 15 is driven to rotate by the engine 14, and the external air is sucked into the building cover 10 as cooling air, and the cooling air is taken into the intercooler 24, the oil cooler 21, the radiator 20. To cool the intake air, hydraulic oil and engine cooling water.

On the other hand, a large amount of foreign matter such as dust is mixed in the cooling air. However, the foreign matter can be caught by the dustproof net 22, and the efficiency of cooling by the oil cooler 21 and the radiator 20 is increased by the accumulation of dust and the like. It can be prevented from lowering. Moreover, in the case of removing foreign matter caught in the dustproof net 22, the work of removing foreign matter 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 turbocharger 16 of the engine 14 and the inflow side tank 25 of the intercooler 24 is provided by using the counter weight 17 and the inflow pipe is provided. 28 is substantially accommodated in the counterweight 17. Thereby, piping can be eliminated from between the radiator 20, the oil cooler 21 and the counter weight 17, and the counter weight 17 can be arranged close to the radiator 20 and the oil cooler 21. The turning radius can be reduced by shortening the length in the rear direction,
The work performance of the hydraulic excavator can be improved.

Further, the inflow pipe 28 is connected to the radiator 20,
Since the piping is routed through the oil cooler 21 in the width direction and the outflow pipe 29 is routed through the radiator 20 and the oil cooler 21 in the width direction, piping can be eliminated from above the radiator 20 and the oil cooler 21.
As a result, the height dimension of the entire heat exchange device can be reduced, so that the engine cover 13 of the building cover 10 can be lowered, and the rear view from the cab 4 can be improved to improve workability and safety. be able to.

The inflow pipe 28 is connected to the counterweight 1
By passing through the inside, a clamp or the like for fixing the inflow pipe can be omitted, and the assembling workability can be improved and the cost can be reduced.

Further, since the heat of the compressed air flowing through the inflow pipe 28 can be released to the counterweight 17 having a large surface area, the compressed air can be efficiently cooled. Further, the size of the intercooler 24 can be reduced.

Further, since the inflow pipe 28 is formed by bending a single pipe member, the inflow pipe 28 can be easily disposed simply by being fixed to a desired position in the counterweight 17. Thus, it is possible to improve the assembling workability, reduce the cost, and the like.

On the other hand, when cleaning the dust-proof net 22, the dust-proof net 22 can be easily pulled out, so that the work of cleaning the dust-proof net 22 can be facilitated and the workability can be improved.

Next, FIGS. 5 and 6 show a second embodiment of the present invention. The feature of this embodiment is that the second fluid pipe is provided on the outer surface of the front plate of the box on the left and right sides. The inflow-side connection port and the outflow-side connection port are provided to extend in the left and right directions inside the box body, and are provided between the inflow-side connection port and the outflow-side connection port. And a frame member that defines a communication path that communicates with the frame member. In the present embodiment, the same components as those in the above-described first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

Reference numeral 41 denotes an inflow pipe 2 according to the first embodiment.
The inflow pipe 41 is a second fluid pipe according to the present embodiment used in place of the inflow pipe 8, and the inflow pipe 41 is separated from the outer surface of the front plate 18A of the weight cover 18 in the left and right directions as shown in FIG. Inflow-side connection cylinder 4 serving as a connection port provided
2. The outflow side connection cylinder 43 and the inside of the weight cover 18 are left,
A rectangular frame member 44 having a U-shaped cross section is provided extending rightward and fixed to the inner surface of the front plate 18A. The square frame member 44 is disposed between the square frame member 44 and the inner surface of the front plate 18A. A communication passage 45 that communicates the communication tube 42 with the outflow side connection cylinder 43 is defined.

The inflow pipe 41 is connected to the inflow side connection cylinder 4.
2 is connected to the turbocharger 16 of the engine 14, and the outflow-side connecting cylinder 43 is connected to the inflow-side tank 25 of the intercooler 24.

Thus, in the present embodiment configured as described above, it is possible to obtain substantially the same operation and effect as in the first embodiment described above. In particular, in the present embodiment, the counter weight 17 is used. The inflow pipe 41 can be easily formed by using the front plate 18A of the weight cover 18, which forms a part of the above, and the shapes of the components constituting the inflow pipe 41 can be simplified.

Next, FIGS. 7 and 8 show a third embodiment of the present invention. The feature of this embodiment is that the second fluid piping is constituted by an upper plate of a box and an upper surface of a heavy object. And an inflow-side connection port and an outflow-side connection port that are provided on the outer surface of the front plate of the box and are separated from each other in the left and right directions and communicate with the space. It is in. In the present embodiment, the same components as those in the above-described first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

Reference numeral 51 denotes a counter weight according to the present embodiment which is used in place of the counter weight 17 according to the first embodiment.
The front plate 52A, the rear plate 52B, the left and right side plates 52 are substantially similar to the counterweight 17 according to the embodiment.
C, 52C, a weight cover 52 as a box composed of an upper plate 52D and a lower plate 52E, and a heavy object 53 filled in the weight cover 52.

However, in the counterweight 51 according to the present embodiment, the left and right mounting holes 52A1 and 52A1 formed in the front plate 52A of the weight cover 52 have the first
The point formed above and below the mounting hole 18A1 according to the second embodiment and the filling amount of the heavy object 53 are different from those of the heavy object 19 according to the first embodiment as shown in FIG. Therefore, the present embodiment is different from the first embodiment in that there are few points.

Reference numeral 54 denotes an inflow pipe 2 according to the first embodiment.
8, an inflow pipe constituting a second fluid pipe according to the present embodiment, wherein the inflow pipe 54 is defined between the upper surface plate 52D of the weight cover 52 and the upper surface 53A of the heavy object 53. Space 55 and an inflow-side connection tube 56 and an outflow-side connection tube 57 which are located on the front plate 52A of the weight cover 52 and are fixed to the mounting holes 52A1 and 52A1 and form connection ports communicating with the space 55. It is configured.

The inflow pipe 54 is connected to the inflow side connection cylinder 5.
6 is connected to the turbocharger 16 of the engine 14, and the outflow-side connecting cylinder 57 is connected to the inflow-side tank 25 of the intercooler 24.

Thus, in the present embodiment configured as described above, substantially the same operation and effect as those of the above embodiments can be obtained. In particular, in the present embodiment, the upper surface 53A And upper surface plate 5 of weight cover 52
Since the inflow pipe 54 can be configured using the space 55 formed between the inflow pipe 2D and the 2D, the configuration of the inflow pipe 54 can be simplified, the assembly workability can be improved, and the manufacturing cost can be reduced. it can.

Next, FIGS. 9 and 10 show a fourth embodiment of the present invention. The feature of this embodiment is that the counterweight is formed by a cast having at least a front surface, a rear surface, an upper surface and a lower surface. The second fluid pipe is provided so as to extend leftward and rightward with a hollow inside the counterweight formed as a cast body, and has a hollow passage having both ends opened to the front surface as an inflow side connection port and an outflow side connection port. It is constituted by. In the present embodiment, the same components as those in the first embodiment are given the same reference numerals,
The description is omitted.

Reference numeral 61 denotes a counter weight according to the present embodiment which is used in place of the counter weight 17 according to the first embodiment.
A, rear surface 61B, left and right side surfaces 61C, 61C, upper surface 6
It is formed by a casting having 1D and a lower surface 61E. Here, a counterweight 61 forming a cast body
Is manufactured as a cast product, for example, by casting cast iron in a mold.

Reference numeral 62 denotes an inflow pipe 2 according to the first embodiment.
8, the inflow pipe 62 is a second fluid pipe according to the present embodiment, and the inflow pipe 62 is located near the upper side of the front surface 61A of the counterweight 61, as shown in FIG. The inflow-side connection tube 63 and the outflow-side connection tube 64 that are spaced apart from each other in the direction and protrude toward the front side.
And the inside of the counter weight 61 as a hollow hole
It is formed to extend leftward and rightward along 1A, and the left and right sides are bent forward and are formed by hollow passages 65 opened in the inflow-side connection tube 63 and the outflow-side connection tube 64, respectively.

The inflow pipe 62 is connected to the inflow side connection cylinder 6.
3 is connected to the turbocharger 16 of the engine 14, and the outflow-side connecting cylinder 64 is connected to the inflow-side tank 25 of the intercooler 24.

Thus, in this embodiment having the above-described structure, substantially the same operation and effect as those of the above-described embodiments can be obtained. In particular, in this embodiment, the counter weight 61 is formed. When the inflow pipe 6
2 can be molded together, so that the configuration can be further simplified, the assembling workability can be improved, the manufacturing cost can be reduced, and the like.

Next, FIGS. 11 and 12 show a fifth embodiment of the present invention.
The present embodiment is characterized in that the counterweight is formed by a cast body having at least a front surface, a rear surface, an upper surface and a lower surface, and the second fluid pipe is provided on the front surface of the counterweight on the left and right sides. A groove is formed between the groove and the groove. The groove is formed between the groove and the groove, and an inflow-side connection port and an outflow-side connection port communicating with the passage are provided on both sides in the left and right directions. And a closing plate. In the present embodiment, the same components as those in the above-described first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

A counter weight 71 according to the present embodiment is used in place of the counter weight 17 according to the first embodiment.
A, formed by a casting having a rear surface 71B, an upper surface 71C, and a lower surface 71D. Here, the counter weight 71 according to the present embodiment is, as shown in FIG.
The rear surface 71B is formed with a circular arc extending to the left and right ends of the front surface 71A, whereby the side surface (side plate) formed in the first embodiment is omitted.

Reference numeral 72 denotes an inflow pipe 2 according to the first embodiment.
8 is used as a second fluid pipe according to the present embodiment, which is used in place of 8. The inflow pipe 72 extends leftward and rightward near the upper side of the front surface 71 </ b> A of the counterweight 71 and is recessed. And a closing plate 74 fixed to the front surface 71A so as to close the recess groove 73 and defining an air passage 75 between the recess groove 73 and the closing groove 74. Are provided on both sides in the left and right directions, and are provided integrally with an inflow-side connection tube 76 and an outflow-side connection tube 77 which communicate with the air passage 75 and protrude forward to form a connection port.

The inflow pipe 72 is connected to the inflow side connection cylinder 7.
6 is connected to the turbocharger 16 of the engine 14, and the outflow-side connecting cylinder 77 is connected to the inflow-side tank 25 of the intercooler 24.

Thus, also in the present embodiment configured as described above, it is possible to obtain substantially the same functions and effects as those of the above-described embodiments.

In each embodiment, the intercooler 24 has been described as an example of the second heat exchanger, but the present invention is not limited to this. For example, the condenser of the air conditioner may be used as the second heat exchanger. Etc. may be applied.

Further, in the second embodiment shown in FIGS. 5 and 6, the case where the square frame member 44 having a U-shaped cross section is used as the frame member has been described as an example. For example, another frame member such as a semicircular frame member having a semicircular cross section or a triangular frame member having a rectangular cross section may be used.

In the fifth embodiment shown in FIGS. 11 and 12, a concave groove 73 is formed in a front surface 71A of a counterweight 71 formed as a casting, and the concave groove 7 is formed in the front surface 71A.
Although the case where the inflow pipe 72 is formed by fixing the closing plate 74 so as to close the third pipe 3 has been described as an example, the present invention is not limited to this configuration, and the inflow pipe according to the fifth embodiment is described. The configuration of 72 may be applied to, for example, the counterweight 17 including the weight cover 18 and the heavy object 19 described in the first embodiment.

In this case, a concave groove is formed on the front surface 18A of the weight cover 18 by pressing, welding, or the like, and the closing plate 74 is closed on the front surface 18A so as to close the concave groove.
May be fixed.

In the fifth embodiment shown in FIGS. 11 and 12, the counterweight 71 is attached to the front surface 71A and the rear surface 7A.
1B, an upper surface 71C, and a lower surface 71D, and a case where it is formed by a casting without left and right side surfaces has been described as an example. However, this structure is similar to that of the first to fourth embodiments. , Right side.

On the other hand, in the first to fourth embodiments,
Although the counterweights 17, 51, and 61 have the left and right sides, the first to fourth embodiments have no left and right sides as in the fifth embodiment. A counter weight may be used.

In the first embodiment shown in FIGS. 1 to 4, the turbocharger 16 is arranged on the rear side of the engine 14 so that the outflow pipe 29 serves as the first fluid pipe on the front side (the cab). 4) and the inflow pipe 28 is
The case where the fluid pipe is disposed on the rear side (the counter weight 17 side) has been described as an example. However, the present invention is not limited to such an arrangement. When the arrangement of the engine 14 is switched between left and right, that is, the turbocharger 16
Is disposed on the front side, the inflow pipe 28 serving as the first fluid pipe may be provided on the front side, and the outflow pipe 29 serving as the second fluid pipe may be provided on the rear side. This configuration can be similarly applied to the second to fifth embodiments.

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

[0079]

As described above in detail, according to the first aspect of the present invention, the first heat exchanger such as a radiator and an oil cooler is connected to the second heat exchanger such as an intercooler through the widthwise front side. A first fluid pipe provided by using a counter weight, and a second fluid pipe connected to the second heat exchanger through a widthwise rear side of the first heat exchanger. ing. Thereby, even when the second fluid pipe is connected to the second heat exchanger through the widthwise rear side of the first heat exchanger,
Since no space is required between the first heat exchanger and the counterweight for passing the piping, the counterweight can be arranged close to the widthwise rear side of the first heat exchanger, The work performance of the construction machine can be improved by shortening the length of the vehicle body of the construction machine.

Further, since the layout of the piping such as the heat exchanger and the arrangement of other equipment can be laid out with a margin, the workability of assembly and maintenance can be improved, and the manufacturing cost can be reduced.

According to the third aspect of the present invention, the second heat exchanger and the inflow side and the outflow side of the second fluid pipe are connected by using separate pipes. The second heat exchanger and the second fluid pipe can be easily connected via the pipe, and the assembly workability can be improved.

According to the fourth aspect of the present invention, the counterweight is constituted by a hollow box body and a heavy object filled in the box body, and the second fluid pipe connects the box body to the left. , Which extend rightward and are formed by pipe members whose both end sides are opened on the front plate of the box body as an inflow side connection port and an outflow side connection port. Almost the whole can be accommodated in the box of the counterweight, and the counterweight can be arranged at a position close to the first heat exchanger.

According to the fifth aspect of the present invention, the counterweight is constituted by a hollow box body and a heavy object filled in the box body, and the second fluid piping is formed by the box body. The inflow-side connection port and the outflow-side connection port provided on the outer surface of the front plate so as to be separated from each other in the left and right directions, and the left side and the right direction extend inside the box, and the inflow side is provided between the inner surface of the front plate Since the connection port and the outflow-side connection port are constituted by the frame member that defines the communication path, the communication path can be defined between the connection port and the frame member by using the front plate of the box. It is possible to easily form the second fluid pipe. Further, almost the entire second fluid pipe can be accommodated in the box of the counterweight, and the counterweight can be arranged at a position close to the first heat exchanger.

According to the invention of claim 6, the counterweight is constituted by a hollow box and a heavy object filled in the box, and the second fluid pipe is connected to the box by the box. A space defined between the upper surface plate and the upper surface of the heavy object, and an inflow-side connection port provided on the outer surface of the front plate of the box so as to be separated in the left and right directions and communicating with the space; And the outflow-side connection port, the second space is formed by utilizing the space defined between the upper surface of the heavy object and the upper surface plate of the box when the heavy object is filled in the box. The fluid pipe can be formed, and the second fluid pipe can be easily formed.
Further, since almost the entire second fluid pipe can be accommodated in the box of the counterweight, the counterweight can be arranged at a position close to the first heat exchanger.

According to the invention of claim 7, the counterweight is formed by a casting having at least a front surface, a rear surface, an upper surface, and a lower surface, and the second fluid pipe has a hollow inside the counterweight formed as a casting. The second fluid pipe is formed when the counterweight is cast because it is formed so as to extend leftward and rightward and both ends are open at the front surface as an inflow side connection port and an outflow side connection port. Can be formed together, and the second fluid pipe can be easily provided. Further, almost the entire second fluid pipe can be accommodated within the outer dimensions of the counterweight, and the counterweight can be arranged at a position close to the first heat exchanger.

According to the eighth aspect of the present invention, the counterweight is formed of a casting having at least a front surface, a rear surface, an upper surface, and a lower surface, and the second fluid pipe extends leftward and rightward on the front surface of the counterweight. And a closing plate defining a passage between the recessed groove and the recessed groove, and having an inflow-side connection port and an outflow-side connection port communicating with the passage on both left and right directions. The second fluid pipe can be easily provided by fixing the closing plate so as to cover the concave groove formed in the front surface of the counterweight. Moreover, almost the entire second fluid pipe can be accommodated within the outer dimensions of the counterweight, and the counterweight can be arranged at a position close to the first heat exchanger.

[Brief description of the drawings]

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

FIG. 2 is a plan view of a main part of a building cover located on a rear side of the upper revolving structure with an engine cover omitted.

Fig. 3 Building cover, counterweight, radiator,
The oil cooler, intercooler, etc. are indicated by arrows III-II in Fig. 2.
It is sectional drawing seen from the I direction.

FIG. 4 shows an inflow pipe and a counterweight indicated by an arrow IV in FIG.
It is sectional drawing seen from the -IV direction.

FIG. 5 is a sectional view showing an inflow pipe together with a counterweight according to a second embodiment of the present invention.

FIG. 6 shows an inflow pipe and a counterweight indicated by an arrow VI in FIG.
It is sectional drawing seen from the -VI direction.

FIG. 7 is a sectional view showing an inflow pipe and a counterweight according to a third embodiment of the present invention.

FIG. 8 shows an inflow pipe and a counterweight indicated by an arrow VI in FIG. 7;
It is sectional drawing seen from the II-VIII direction.

FIG. 9 is a sectional view showing an inflow pipe and a counterweight according to a fourth embodiment of the present invention.

10 is a cross-sectional view of the inflow pipe and the counterweight as viewed from the direction indicated by arrows XX in FIG. 9;

FIG. 11 is a sectional view showing an inflow pipe and a counterweight according to a fifth embodiment of the present invention.

12 is a cross-sectional view of the inflow pipe and the counterweight as viewed from the direction of arrows XII-XII in FIG. 11;

[Explanation of symbols]

3 Revolving frame 5 Working device 14 Engine 16 Turbocharger 17, 51, 61, 71 Counterweight 18, 52 Weight cover 18A, 52A Front plate 18D, 52D Top plate 19, 53 Heavy object 20 Radiator (first heat exchange 21) Oil cooler (first heat exchanger) 24 Intercooler (second heat exchanger) 28, 41, 54, 62, 72 Inflow pipe (second fluid pipe) 28A Inflow side connection port 28B Outflow side connection Port 29 Outflow pipe (first fluid pipe) 30 Rubber hose (tube) 42, 56, 63, 76 Inflow side connection pipe (inflow side connection port) 43, 57, 64, 77 Outflow side connection pipe (outflow side connection port) ) 44 Square frame member (frame member) 45 Communication path 53A Upper surface 55 Space portion 65 Hollow passage 73 Depressed groove 74 Closing plate 75 Air passage

Continued on front page (72) Inventor Koji Tahara 650, Kandate-cho, Tsuchiura-shi, Ibaraki Prefecture Inside the Tsuchiura Plant of Hitachi Construction Machinery Co., Ltd. F term in Tsuchiura factory (reference) 3D035 CA25 CA27 3D038 AA10 AB09 AC02 AC25

Claims (8)

[Claims] 1. A frame provided with a working device on a front side, an engine mounted in a horizontal state extending leftward and rightward on a rear side of the frame, and a rear portion of the frame for balancing the working device. A counterweight attached to the end, a first heat exchanger provided on one side of the engine in the left or right direction, and a side opposite to the engine with the first heat exchanger interposed therebetween. And a second heat exchanger that is provided in the thickness direction of the first heat exchanger, and the second heat exchanger passes through the widthwise front side of the first heat exchanger. A first fluid pipe connected to the first heat exchanger, and provided using the counter weight, and connected to the second heat exchanger through a widthwise rear side of the first heat exchanger. And a second fluid pipe. 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, wherein the construction machine is an intercooler for cooling compressed air from the air conditioner. 3. The construction machine according to claim 1, wherein the second heat exchanger and the inflow side and the outflow side of the second fluid pipe are connected using separate pipes. . 4. The counterweight includes a hollow box body and a heavy object filled in the box body, and the second fluid pipe extends left and right in the box body. The construction machine according to claim 1, 2 or 3, wherein the construction member is provided with a pipe member having both ends opened to a front plate of the box body as an inflow side connection port and an outflow side connection port. 5. The counterweight includes a hollow box body and a heavy object filled in the box body, and the second fluid pipe is provided on an outer surface of a front plate of the box body on a left side thereof. , An inflow-side connection port and an outflow-side connection port provided apart from each other in the right direction, and extending left and right in the box body.
The construction machine according to claim 1, further comprising a frame member defining a communication passage between the inner surface of the front plate and the inflow-side connection port and the outflow-side connection port. 6. The counterweight comprises a hollow box body and a heavy object filled in the box body, and the second fluid pipe comprises an upper plate of the box body and the weight. A space defined between the upper surface of the object and an inlet-side connection port and an outlet-side connection provided on the outer surface of the front plate of the box so as to be separated from each other in the left and right directions and communicating with the space; The construction machine according to claim 1, wherein the construction machine comprises: 7. The counterweight is formed by a casting having at least a front surface, a rear surface, an upper surface, and a lower surface, and the second fluid pipe is formed in a left and right direction with a hollow inside the counterweight formed as a casting. 2. A hollow passage which is formed so as to extend and has both ends opened to said front surface as an inflow side connection port and an outflow side connection port.
4. The construction machine according to 2 or 3. 8. The counterweight is formed by a casting having at least a front surface, a rear surface, an upper surface, and a lower surface, and the second fluid pipe extends leftward and rightward from the front surface of the counterweight and is recessed. A passage is defined between the recess and the recess, and a closing plate provided with an inflow-side connection port and an outflow-side connection port communicating with the passage on both sides in the left and right directions. The construction machine according to claim 1, 2 or 3.