JP2000080676A - Construction machinery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To connect piping to a heat exchanger without moving a counterweight backward, to improve workability at the time of assembly and maintenance and to reduce manufacturing cost. SOLUTION: It is constituted to pass an inflow hose 26 and an outflow hose 27 connected to an intercooler 22 through the outside of the front and rear directions of a radiator 18 and an oil cooler 19. Consequently, it is possible to facilitate retraction and protraction of a dustproof net 20 provided on the left surface of the oil cooler 19. At this time, the inflow hose 26 and the outflow hose 27 are projected in the front and rear directions of the radiator 18 and the oil cooler 19. However, it is possible to easily handle the inflow hose 26 without retracting a counterweight 30 by providing a hose storage part 36 to store the inflow hose 26 on the counterweight 30.

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.
A prime mover mounted in a horizontal state extending rightward, a counterweight attached to a rear end of the turning frame for balancing with the working device, and provided on one of left and right sides of the prime mover; (See, for example, Japanese Utility Model Laid-Open No. 62-14865).
5).

Here, the heat exchanger includes a radiator which is located near the prime mover and cools cooling water from the prime mover, a lower traveling body, 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, which is located to overlap the upstream side of the first heat exchanger and cools compressed air from a supercharger provided in the motor. There is. And a first heat exchanger,
An inflow pipe and an outflow pipe are connected to the second heat exchanger, respectively, and these pipes are routed around each heat exchanger and the prime mover.

[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 heat exchangers, prime movers and the like. For this reason, space around these pipes is required around the prime mover and the like.

Therefore, it is conceivable to increase the space around the prime mover by moving the counterweight rearward, but in this case, the rotation of the upper revolving unit when the upper revolving body turns is increased by the amount of movement of the counterweight rearward. Radius (below,
(Referred to as turning radius) becomes large, and there is a problem that work performance is reduced.

As described above, in the hydraulic excavator, since the turning radius is made as small as possible, the space that can be secured around the prime mover is limited. Therefore, in order to secure a space for arranging the piping, it is necessary to change the layout of other devices and downsize the other devices, which leads to a decrease in assembly workability, maintenance workability, and an increase in cost. There is a problem.

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 pipes to a heat exchanger without moving a counterweight backward, thereby assembling and maintaining a work. It is an object of the present invention to provide a construction machine capable of improving performance, reducing manufacturing costs, and the like.

[0009]

In order to solve the above-mentioned problems, a construction machine employed in the first aspect of the present invention comprises a frame provided with a working device on the front side, and left and right sides on the rear side of the frame. A prime mover mounted in a horizontal state extending in the direction,
A counterweight attached to a rear end of the frame for balancing with the working device; a first heat exchanger provided on one of left and right sides of the motor; A second heat exchanger provided on the heat exchanger, and an inflow pipe connected to the second heat exchanger through the front and rear outer sides of the first heat exchanger, respectively.
An outlet pipe, and a pipe housing portion provided on the counter weight for housing a pipe disposed on the rear side of the inflow pipe and the outflow pipe.

[0010] With this configuration, the inflow pipe and the outflow pipe pass through the front and rear sides of the first heat exchanger so that the inflow pipe and the outflow pipe pass forward and backward of the first heat exchanger. Although the pipe protrudes rearward, the pipe protruding to the rear side can be accommodated in the pipe accommodating portion formed on the counterweight, so that this pipe can be handled with sufficient margin without moving the counterweight backward. it can.

The first heat exchanger may be a radiator for cooling the cooling water from the prime mover or an oil cooler for cooling the working oil, and the second heat exchanger may be a prime mover for the prime mover. May be used as an intercooler for cooling the compressed air from the supercharger provided in the air conditioner.

According to a third aspect of the present invention, a dust-proof net is provided so as to be able to be inserted and removed in an upward and downward direction so as to be overlapped with the first heat exchanger, and an inflow pipe and an outflow pipe are arranged before and after the dust-proof net. I did it.

[0013] With this configuration, dust in the cooling air can be caught by the dust-proof net and dust can be prevented from being deposited on the first heat exchanger. And
When cleaning the dustproof net, since there is no pipe above the first heat exchanger, it can be easily removed by pulling the dustproof net upward.

[0014]

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 FIGS.

Reference numeral 1 denotes a lower traveling body, and 2 denotes an upper revolving body mounted on the lower traveling body 1 so as to be pivotable.
Is a turning frame 3 forming a structure, and the turning frame 3
A cabin 4 provided on the front left side of the vehicle, and a counter weight 30 described later mounted on the rear side of the revolving frame 3.
A work device 5 for excavating earth and sand is provided on the front side of the turning frame 3.

As shown in FIG. 2, the revolving frame 3 includes center frames 6 and 6 arranged substantially in parallel with each other, and side frames 7 provided on the left and right sides of the center frames 6 respectively. , 7 and a plurality of overhanging beams 8, 8 connecting each center frame 6 and each side frame 7.
The lower side of the turning frame 3 is covered with an under cover 9. The rear side of each center frame 6 protrudes rearward as shown in FIG. 3 and serves as a weight mounting portion 6A for supporting the counterweight 30.

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;
An upper cover 12 extending in the horizontal direction so as to cover an upper end side of each side cover 11 and having an opening 12A formed in the center;
An engine cover 13 that is openably and closably attached to the upper cover 12 so as to cover the opening 12A of the upper cover 12.
This is roughly configured. In addition, each side cover 1
1 is provided with an air flow port 11A composed of a plurality of slits.

Reference numeral 14 denotes an engine as a prime mover mounted in the building cover 10 and mounted on the rear side of each center frame 6 so as to extend leftward and rightward.
A cooling fan 15 is mounted on the left side of the engine 4 and is driven by the engine 14 on the right side. ) Is mounted. The engine 14 has a turbocharger 1
7, the turbocharger 17 has a drive-side turbine chamber connected to an exhaust manifold and a muffler,
The driven turbine chamber is connected to an inflow hose 26 described later and an intake hose from the air cleaner (both not shown).

Here, the cooling fan 15 is connected to the engine 14
The air is sucked into the building cover 10 by being rotated, and the air is supplied to the intercooler 22, the oil cooler 19, and the radiator 18 sequentially as cooling air.

Numeral 18 denotes a radiator serving as a heat exchanger provided in the building cover 10. The radiator 18 is located adjacent to the left side of the cooling fan 15, and as shown in FIG. 8 is bolted on. And the radiator 18 is
A and the lower tank 18B are connected to a water jacket (both not shown) of the engine 14 via a pipe, whereby heat of the engine cooling water circulating between the engine 14 and the engine 14 is exchanged by the radiator 18C. Released into the cooling air,
The engine cooling water is cooled.

An oil cooler 19 is a first heat exchanger mounted on the left side of the radiator 18 so as to form a first heat exchanger.
The lower tank 19B is connected to a hydraulic oil tank (neither is shown) via a pipe, which is connected to a return pipe from each actuator such as the working device 5 or the like. This allows
The oil cooler 19 releases the heat of the hydraulic oil at the heat radiating portion 19C to cool the hydraulic oil.

Reference numeral 20 denotes a dustproof net provided on the left side of the oil cooler 19, and foreign matter such as relatively large dust is clogged in the heat radiating portion 19C of the oil cooler 19 and the heat radiating portion 18C of the radiator 18. To prevent the oil cooler 19 from accumulating in the front and rear directions (width direction) of the oil cooler 19.
It is held between guide members 21 and 21 having a substantially L-shaped cross section and provided at both ends to extend upward and downward. The dustproof net 20 is inserted and removed upward and downward along each guide member 21, and is pulled out upward when removing captured dust.

Reference numeral 22 denotes an intercooler as a second heat exchanger provided on the left side of the oil cooler 19 with the dustproof net 20 interposed therebetween. The intercooler 22 is located on the rear side (counter weight 30 side). 23, an outflow-side tank 24 located on the front side (on the working device 5 side), and a heat radiating portion 25 provided between the tanks 23 and 24 and composed of a plurality of thin tubes and heat radiating fins. In addition, the inflow side tank 23 is provided with an inflow pipe 23A extending toward the engine 14 as shown in FIG. Further, the outflow side tank 24 has an outflow pipe 24A.
Is provided extending to the engine 14 side.

Here, the intercooler 22 is formed to have a size larger than the length in the front and rear directions of the oil cooler 19 and the radiator 18, whereby the inflow pipe 23 A of the inflow side tank 23 and the outflow side tank 24 are formed. The outflow pipe 24A is disposed outside the oil cooler 19 and the radiator 18 in front and rear directions. The intercooler 22 is bolted to the oil cooler 19 via brackets 23B and 24B provided on the tanks 23 and 24.

The intercooler 22 is connected to the engine 1
The compressed air is cooled by flowing air compressed by the turbocharger 17 of No. 4 into the inflow-side tank 23 through an inflow hose 26 to be described later and flowing through the radiator 25. It is supplied to the intake manifold of the engine 14 through the outflow hose 27.

Reference numeral 26 denotes an inflow hose which forms an inflow pipe connecting the turbocharger 17 of the engine 14 and the intercooler 22. The inflow hose 26 has one end on the turbocharger 17 side.
And the other end is connected to the inflow pipe 23A of the inflow side tank 23. And
The inflow hose 26 is connected to the radiator 18, the oil cooler 19
The counterweight 30 is housed in a hose housing portion 36 formed on the counterweight 30.

Reference numeral 27 denotes an outflow hose which forms an outflow pipe connecting the intercooler 22 and the engine 14. The outflow hose 27 has one end on the outflow pipe 24A of the outflow side tank 24.
And the other end is connected to the intake manifold of the engine 14. And the outflow hose 27 is
The radiator 18 and the oil cooler 19 are arranged on the opposite side of the inflow hose 26 so as to pass through the front outside.

Here, the inflow hose 26 and the outflow hose 27
Are passed outside the radiator 18 and the oil cooler 19 in the front and rear directions so as not to hinder the insertion and removal of the dustproof net 20. In addition, since the members such as the inflow hose 26 and the outflow hose 27 are eliminated from the upper side of the radiator 18 and the oil cooler 19, the overall height of the heat exchanger including the radiator 18, the oil cooler 19 and the like can be reduced. Radiator 18, oil cooler 19
Can be made into a simple substantially rectangular shape as shown in FIG.

Reference numeral 28 denotes a lower shielding member which is located below the radiator 18 and shields the space between the overhanging beams 8, 8.
Reference numeral 29 denotes an upper shielding member fixed to the inside of the engine cover 13 at a position corresponding to the upper side of the radiator 18, and the shielding members 28 and 29 constitute a circulation prevention cover and are formed of, for example, sponge rubber or the like. And
The shielding members 28 and 29 are cooled by the cooling air that has passed through the radiator 18 located at the most downstream side and has become high temperature.
2. It prevents recirculation (circulation) wrapping around the upstream side of the oil cooler 19, thereby preventing a decrease in cooling efficiency.

Here, the upper shielding member 29 provided in the engine cover 13 has a trapezoidal shape having a simple substantially rectangular concave portion 29A on the lower side by removing a hose or the like from the upper side of the radiator 18. Is formed. Thus, when the engine cover 13 is closed, the upper shielding member 29 is closely attached along the radiator 18 to reliably prevent the recirculation of the cooling air, and can increase the durability against damage due to contact or the like.

Numeral 30 denotes a counter weight attached to the rear end of the turning frame 3.
A weight cover 31, which will be described later, has a hollow hermetic structure, a hose storage box 35, which forms a hose storage portion 36, and a weight adjustment member 37, which will be described later, to be filled in the weight cover 31
This is roughly configured.

A weight cover 31 forms an outer shell of the counterweight 30. The weight cover 31 has a curved rear surface portion 32A and an upper surface portion 3 as shown in FIGS.
2B, lower surface 32C, left side 32D and right side 3
Box body 32 formed in a box shape opened to the front side by 2E
And a lid plate 33 welded to the box 32 so as to close the front opening of the box 32.

Numerals 34, 34 are located to the left and right of the weight cover 31, respectively, and the lower surface 32 C of the box 32 and the cover plate 33
And each frame fitting box 34 forms a rectangular parallelepiped space that opens toward the front side and the lower side. And each frame fitting box 3
The weight mounting portion 6A of the center frame 6 is fitted into the rectangular parallelepiped space formed by the bolt 4, and is integrally bolted.

Numeral 35 denotes a hose storage box provided on the upper side from the intermediate height position of the cover plate 33.
Has a rear surface 35A, a lower surface 35B, a left side surface 35C, and a right side surface 35D, and upper end edges of the rear surface 35A, the left side surface 35C, and the right side surface 35D are welded to the upper surface portion 32B of the box 32. As a result, the hose housing box 35 opens toward the front between the upper surface 32B of the box body 32 and forms a hose housing section 36 as a horizontally long pipe housing section extending leftward and rightward.

Here, the hose accommodating portion 36 is provided with the engine 1
4 accommodates the inflow hose 26 connecting the turbocharger 17 and the intercooler 22, so that the inflow hose 26 can be moved forward and backward of the radiator 18 and the oil cooler 19 without moving the counterweight 30 backward. It is possible to arrange outside.

Reference numeral 37 denotes a weight adjusting material filled in the weight cover 31. The weight adjusting material 37 is, for example, iron scrap,
It is made of concrete or the like, and the filling amount and the filling ratio thereof are appropriately set according to the type of the working device 5 and the like.

The hydraulic shovel according to the present embodiment has the above-described configuration. When the hydraulic pump 16 is driven by the engine 14, the hydraulic pump 16 applies pressure to each actuator of the lower traveling body 1 and the working device 5. Oil is supplied, and the lower traveling body 1 is caused to travel, 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 outside air is sucked into the building cover 10 as cooling air, and this cooling air is intercooled 22, the oil cooler 19, and the radiator 18. To cool the intake air, hydraulic oil and engine cooling water.

A part of the cooling air passing through the radiator 18 and having a high temperature passes through the upper side and the lower side of the radiator 18 and goes to the upstream side.
29 prevents the high-temperature cooling air from flowing around. At this time, since the upper shielding member 29 is in close contact with the upper side of the radiator 18, it is possible to reliably prevent the cooling air from flowing around and recirculating.

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 20, and the oil cooler 1
9. It is possible to prevent the cooling efficiency of the radiator 18 from decreasing. In addition, when removing the foreign matter caught by the dustproof net 20, the work of removing the foreign matter can be easily performed by pulling the dustproof net 20 upward.

As described above, according to the present embodiment, the inflow hose 26 and the outflow hose 27 connecting the engine 14 and the intercooler 22 are routed through the front and rear outsides of the radiator 18 and the oil cooler 19. Therefore, the hose can be removed from above the radiator 18 and the oil cooler 19.

Thus, the height of the entire heat exchanger can be reduced, and the building cover 1 covering the heat exchanger can be reduced.
Since the engine cover 13 can be lowered,
The rear view from the cabin 4 can be improved, and workability and safety can be improved.

Also, since the shape of the upper shielding member 29 provided in the engine cover 13 corresponding to the radiator 18 can be made simple, the upper shielding member 29 can be closely attached along the radiator 18. Thus, the recirculation of the cooling air can be reliably prevented, and the cooling efficiency of the radiator 18, the oil cooler 19, and the intercooler 22 can be increased. Furthermore, by making the upper shielding member 29 simple, the manufacturing cost can be reduced, and the durability against damage and the like can be increased.

Further, when cleaning the dust-proof net 20, the dust-proof net 20 can be easily pulled out, so that the cleaning work of the dust-proof net 20 can be facilitated and the workability can be improved.

On the other hand, when the inflow hose 26 and the outflow hose 27 connecting the engine 14 and the intercooler 22 are routed outside the radiator 18 and the oil cooler 19 in the front and rear directions, the inflow hose 26 and the outflow hose 2 are connected.
7 projects forward and rearward from the radiator 18 and the oil cooler 19.

However, in the present embodiment, the inflow hose 26 projecting rearward can be accommodated in the hose accommodating portion 36 formed on the counterweight 30, so that the counterweight 30 must be moved backward. In addition, a space for arranging the inflow hose 26 can be secured, and the inflow hose 26 can be piped with a margin.

As a result, an increase in the turning radius due to the retreat of the counterweight 30 can be prevented, and the work performance of the excavator can be improved. Further, since other devices can be laid out with a margin, it is possible to improve assembling workability and maintenance workability, and to reduce manufacturing cost.

In the embodiment, the intercooler 22 has been described as an example of the second heat exchanger. However, the present invention is not limited to this. For example, a condenser or the like of an air conditioner may be used as the second heat exchanger. May be applied.

In the embodiment, the oil cooler 19 has been described as an example of the first heat exchanger. Alternatively, the radiator 18 may be used as the first heat exchanger.

Further, in the embodiment, the counterweight 30 includes a weight cover 31 having a hollow hermetic structure,
The weight cover 31 is filled with the weight adjusting material 37 and the like, and the hose cover 35 is welded to the weight cover 31 to form the hose accommodating portion 36. The present invention is not limited to this. For example, when the counterweight is an integral product formed by casting, the hose receiving portion may be provided at the molding stage.

In the embodiment, the inflow hose 26 is described as being housed in the hose housing portion 36 formed in the counterweight 30. However, when the direction of the engine 14 is opposite in the left and right directions, The outflow hose 27 is housed in the hose housing part 36.

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

[0053]

As described in detail above, according to the first and second aspects of the present invention, the cooling air flows through the second heat exchanger such as a radiator and an oil cooler and the first heat exchanger such as an intercooler. Thereby, the fluid can be cooled by these heat exchangers. The inflow piping and the outflow piping protrude forward and backward from the first heat exchanger by passing the inflow piping and the outflow piping in front of and behind the first heat exchanger. Can be accommodated in a piping accommodating portion formed in the counterweight, so that the piping can be handled with a margin without moving the counterweight backward.

As a result, it is possible to prevent the turning radius from increasing due to the retreat of the counterweight, and to improve the working performance of the excavator. Further, since other devices can be laid out with a margin, it is possible to improve assembling workability and maintenance workability, and to reduce manufacturing cost.

According to the third aspect of the invention, dust in the cooling air can be caught by the dust-proof net, so that dust can be prevented from being deposited on the first heat exchanger. Cooling efficiency can be increased. Further, when cleaning dust trapped by the dust-proof net, since there is no pipe above the first heat exchanger, the dust-proof net can be easily removed by pulling the dust-proof net upward, and the workability during the cleaning operation can be improved. Can be improved.

[Brief description of the drawings]

FIG. 1 is a side view showing a hydraulic excavator according to an embodiment of the present invention.

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

FIG. 3 is a cross-sectional view showing an intercooler, a counterweight, and the like from the direction of arrows III-III in FIG. 2;

4 is a cross-sectional view showing an engine, a radiator, an oil cooler, an intercooler, a counterweight, and the like, as viewed from a direction indicated by arrows IV-IV in FIG.

FIG. 5 is an external perspective view showing a counter weight according to the present embodiment.

[Explanation of symbols]

 Reference Signs List 3 Revolving frame 5 Working device 14 Engine (motor) 18 Radiator 19 Oil cooler (first heat exchanger) 20 Dustproof net 22 Intercooler (second heat exchanger) 26 Inflow hose (inflow pipe) 27 Outflow hose (outflow pipe) ) 30 Counterweight 36 Hose storage (Piping storage)

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Kazunori Nakamura 650, Kandamachi, Tsuchiura-shi, Ibaraki Prefecture Inside the Tsuchiura Plant of Hitachi Construction Machinery Co., Ltd. Inside the Tsuchiura Plant of Shikisha Co., Ltd. (72) Koji Kawasaki Inventor Kojimachi, Tsuchiura-shi, Ibaraki Pref. Hitachi Construction Machinery Co., Ltd. F-Term in Tsuchiura Plant of Hitachi Ltd. 2D015 BA01 CA02 FA02

Claims (3)

[Claims] 1. A frame provided with a working device on the front side, a prime mover mounted in a horizontal state extending left and right on the rear side of the frame, and a rear side of the frame for balancing with the working device. A counter weight attached to the end, a first heat exchanger provided on one side of the prime mover in the left and right directions, and a second heat exchanger provided on the first heat exchanger. Heat exchanger, an inflow pipe and an outflow pipe connected to the second heat exchanger through outer sides in front and rear of the first heat exchanger, respectively. A construction machine comprising: a pipe accommodation section provided on the counterweight for accommodating a pipe disposed on a rear side. 2. The first heat exchanger is a radiator that cools cooling water from the prime mover or an oil cooler that cools hydraulic oil, and the second heat exchanger is a supercooler provided in the prime mover. The construction machine according to claim 1, wherein the construction machine is an intercooler for cooling compressed air from a supply device. 3. A dustproof net is provided on the first heat exchanger so as to be able to be inserted and removed upward and downward, and the inflow pipe and the outflow pipe are arranged before and after the dustproof net. The construction machine according to claim 1.