JP2004353532A - Working machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a working machine in which the layout structure of a cooling unit to be easily restricted in layout are improved. <P>SOLUTION: A penetration space 51 which is penetrated in the longitudinal direction is formed in a counter weight 12 mounted on a rear part of a machine body, and a cooling unit 53 is accommodated in the penetration space 51 in the counter weight 12. An engine 60 is disposed on the front side of the cooling unit 53, and the periphery of the engine 60 is covered by an engine hood 71. Exhaust ports 72 and 73 are opened in upper and lower parts of a boundary part between the engine hood 71 and the counter weight 12, and guides 74 and 75 to cover the exhaust ports 72 and 73 and guide the exhaust fluid forward are installed. A sound absorbing material 76 is installed at an inner surface position of the engine hood 71 facing at least an upper part of the engine. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a work machine provided with a counterweight.
[0002]
[Prior art]
FIG. 6 shows a hydraulic excavator as a working machine, in which a lower traveling body 10 is provided with an upper revolving body 11 as an airframe so as to be revolvable, and a counterweight 12 is mounted on a rear portion of the upper revolving body 11. A power unit 13 such as an engine and a hydraulic pump driven by the engine is arranged in front of the turret 12, while a cab 14, a working device 15, and the like that cover the operation space of the operator are mounted in front of the upper revolving unit 11. Have been.
[0003]
FIG. 7 shows the inside of the power unit 13. As a driving method of a cooling fan 28 for cooling a cooling unit 27 including a radiator 24, an oil cooler 25, and an aftercooler 26, an output rotation from a crankshaft of an engine 29 is used. A belt drive system for transmitting to the cooling fan 28 via a belt transmission mechanism is adopted. Therefore, it is necessary to arrange the cooling unit 27 on the left side of the upper-part turning body 11 and in front of the counterweight 12 due to restrictions on arrangement.
[0004]
On the other hand, a hydraulic pump unit 31 including a plurality of hydraulic pumps driven by the engine 29 is disposed on the right side of the upper swing body 11 and in front of the counterweight 12. The cooling water of the engine 29 is circulated between the radiator 24 and the radiator 24 via a radiator pipe 32, and the hydraulic pump unit 31 sucks hydraulic oil in a hydraulic oil tank 34 installed adjacent to the fuel tank 33. Then, hydraulic oil is supplied to various hydraulic actuators via a control valve (not shown). The hydraulic oil whose temperature has risen due to the work of the various hydraulic actuators is cooled by the oil cooler 25 before the oil cooler pipe 35. To return to the hydraulic oil tank.
[0005]
The exhaust gas of the engine 29 drives the exhaust turbine 36a of the turbocharger 36 and then is exhausted into the atmosphere from an exhaust pipe 38 via a muffler 37. On the other hand, the intake system of the engine 29 is taken in from an air cleaner 41. The outside air is sucked into the centrifugal compressor 36b of the turbocharger 36 via the air cleaner pipe 42, and the compressed air pressurized by the centrifugal compressor 36b is supplied to the aftercooler 26 via the aftercooler pipe 43, and the aftercooler 26 After being cooled, it is supplied to the engine 29 via an aftercooler pipe 44.
[0006]
The cooling unit 27 is of a belt drive type, but operates a fan hydraulic motor (not shown) with hydraulic oil supplied from a fan hydraulic pump of the hydraulic pump unit 31 to be cooled by the fan hydraulic motor. There is also a hydraulic motor driven cooling unit that drives the fan 28. This cooling unit of the hydraulic motor drive type is also arranged on the left side of the upper swing body 11 and in front of the counter weight 12 due to space issues.
[0007]
In a working machine in which the engine 29 is arranged close to the counterweight 12 as described above, there is no room in the piping space. For example, in order to pass the intake pipe of the engine through the engine facing surface of the counterweight facing the engine. By forming a concave pipe space, the intake pipe can pass between the counterweight and the engine without installing the counterweight away from the engine, and the counterweight projects outward. In some cases, the cooling unit is arranged on the left side of the upper swing body 11 and in front of the counter weight 12 (for example, see Patent Document 1).
[0008]
[Patent Document 1]
JP-A-2002-168443 (page 3, FIG. 2)
[0009]
[Problems to be solved by the invention]
As described above, when the cooling unit 27 is disposed on the left side of the upper swing body 11 and in front of the counterweight 12, there are the following problems due to layout restrictions.
[0010]
(1) A cooling unit 27 of a one-fan type, which cools the radiator 24 and the oil cooler 25 with one cooling fan 28, has to be adopted, and the amount of heat radiation of the radiator 24 and the oil cooler 25 is different depending on the model. Therefore, there is a problem that a different cooling unit must be designed between the models.
[0011]
(2) The oil cooler pipe 35, the air cleaner pipe 42, and the aftercooler pipes 43 and 44 are densely packed, which causes difficulty in piping design, generation of hot air entrainment due to difficulty in sealing around the pipes, and difficulty in assembly work. There's a problem.
[0012]
(3) There is a problem that a sufficient space for increasing the capacity of the fuel tank 33 or the like cannot be secured.
[0013]
(4) The air exhausted from the cooling fan 28 is radially discharged from the circumferential portion. In this air discharging direction, the counter weight 12 and the counter weight 12 are disposed on the opposite side via the engine 29. A firewall (not shown) to be installed is arranged in close proximity, and these obstacle walls obstruct the exhaust air path of the cooling fan 28, preventing smooth exhaust and increasing air resistance.
[0014]
(5) The air exhausted from the cooling fan 28 is discharged to the outside through an upper opening of an engine hood (not shown) that covers the engine 29, but there is a problem that engine noise leaks through the upper opening of the engine hood as it is. .
[0015]
SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a working machine having an improved arrangement structure of a cooling unit which is easily subject to layout restrictions.
[0016]
[Means for Solving the Problems]
According to the first aspect of the present invention, there is provided a working device mounted on one of the body, a counterweight mounted on the opposite side of the body with respect to the working device, and a through space provided through the counterweight. And a cooling unit for cooling accommodated in the through space of the counter weight, and the cooling unit is accommodated in the through space of the counter weight. It is hard to be restricted, and an extra space is created at the place where the conventional cooling unit is arranged, and this extra space can be used effectively.
[0017]
The invention described in claim 2 is a work device mounted on the front part of the fuselage, a counter weight mounted on the rear part of the fuselage, a penetration space provided through the counter weight in the front-rear direction, A working machine comprising a cooling unit for cooling housed in a through space of the weight, wherein a counterweight at the rear of the body with respect to the working device at the front of the body is provided with a through space in the front-rear direction, and cooling is provided here. Since the units are stored, it is possible to improve the restrictions on the layout of the cooling unit while preventing the fuselage from becoming too long in the front-rear direction.Also, there is extra space in the place where the conventional cooling unit was located. For example, by relocating a fuel tank or the like to the fuel cell, it is possible to greatly increase the fuel tank capacity and the like.
[0018]
According to a third aspect of the present invention, in the working machine according to the second aspect, an upper portion of a boundary portion between the engine disposed on the front side of the cooling unit, the engine hood covering the periphery of the engine, and the counterweight of the engine hood. And a guide that covers the exhaust port and guides the exhaust fluid forward, wherein the flow rate of hot air discharged from the cooling unit is a guide in the vertical direction. Hot air can be exhausted smoothly, and in the width direction of the fuselage, the cooling unit is located at the center in the width direction of the counterweight without being restricted by the engine as compared with the conventional type. Because it is possible to arrange, the distance from the cooling unit to the side plate of the aircraft becomes longer, It reduces the exhaust resistance than, can be evacuated more air volume.
[0019]
The invention described in claim 4 is the working machine according to claim 3, which is a working machine including a sound absorbing material installed at least at an inner surface position of the engine hood facing the upper part of the engine, and by providing a guide, Since the opening of the engine hood can be limited to the exhaust port opened at the boundary between the engine hood and the counterweight, the sound absorbing material can also be installed at the inner surface of the engine hood facing the upper part of the engine. The noise leaked from the upper engine hood opening can be reduced.
[0020]
According to a fifth aspect of the present invention, in the working machine according to any one of the first to fourth aspects, the cooling unit is provided with a radiator for cooling engine cooling water and a hydraulic circuit arranged in a width direction of the body with respect to the radiator. An oil cooler that cools the hydraulic oil of the working machine, and a working machine including a plurality of cooling fans arranged respectively for the radiator and the oil cooler, since the oil coolers are arranged in the width direction of the body of the radiator, There is no danger that the conventional oil cooler pipes and air cleaner pipes may be crowded as in the prior art, and these pipes are easy to construct. Therefore, a seal structure that does not involve hot air can be taken, and the structure is easy to assemble. In addition, a required amount of air can be supplied to each of the radiator and the oil cooler from the plurality of cooling fans.
[0021]
According to a sixth aspect of the present invention, there is provided a working machine in which the plurality of cooling fans in the working machine according to the fifth aspect are rotationally driven by a common motor via a plurality of pulley / belt type transmission mechanisms. A cooling fan that is driven to rotate via multiple pulley / belt type transmission mechanisms is installed for the oil cooler and the oil cooler, and supplies the required air volume to each of the radiator and oil cooler for each work machine model and specification. Therefore, even with a common cooling unit, a simple change of only the pulley ratio can satisfy various types of cooling conditions.
[0022]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described in detail with reference to one embodiment shown in FIGS.
[0023]
FIG. 5 shows a hydraulic excavator as a working machine, in which an undercarriage 10 is provided with an upper revolving body 11 as an airframe so as to be revolvable, and a counterweight 12 is mounted on a rear portion of the upper revolving body 11. A power unit 13 such as an engine and a hydraulic pump driven by the engine is arranged in front of the turret 12, while a cab 14, a working device 15, and the like that cover the operation space of the operator are mounted in front of the upper revolving unit 11. Have been.
[0024]
That is, the working device 15 is mounted on one of the upper revolving units 11, and the counterweight 12 is mounted on the opposite side of the upper revolving unit 11 with respect to the working device 15.
[0025]
The working device 15 has a boom 17 pivoted by a boom hydraulic cylinder 16, an arm 19 pivoted by an arm hydraulic cylinder 18 pivotally supported by a tip end of the boom 17, and a bucket hydraulic cylinder A bucket 23 which is rotated by a linkage 21 via a linkage 22 is supported by a shaft.
[0026]
As shown in FIGS. 1 and 2, the counterweight 12 is provided with a recessed through-hole 51 that penetrates in the front-rear direction, and is provided in the through-hole 51 of the counterweight 12 via a mounting member 52 for cooling cooling. The unit 53 is housed and installed.
[0027]
A reinforcing member 54 and an upper surface member 55 are installed at the open upper surface of the concave through space 51 so as to span the left and right portions of the counter weight 12, and a gap between the counter weight 12 or the upper surface member 55 and the cooling unit 53 is provided. Is provided with a filler 56.
[0028]
Further, a rear cover 58 is installed on the upper surface member 55 via a hinge 57 so as to be openable and closable. A large number of ventilation holes 59 are formed in the rear cover 58.
[0029]
As shown in FIGS. 2 and 3, the cooling unit 53 includes a radiator 61 that cools the cooling water of the engine 60, and an oil that is arranged in the width direction of the body of the radiator 61 and cools hydraulic oil in a hydraulic circuit. A cooler 62, an aftercooler 63 disposed behind the oil cooler 62 to cool compressed air pressurized by a turbocharger before supplying the engine 60, and a radiator 61 and an oil cooler 62. A plurality of cooling fans 64 and 65 are provided.
[0030]
As shown in FIGS. 3 and 4, the plurality of cooling fans 64, 65 are rotationally driven by a fan hydraulic motor 66 as a common motor via a plurality of pulley / belt type transmission mechanisms 67, 68, respectively. Things. The fan hydraulic motor 66 is rotated by hydraulic oil pressurized and supplied from a fan hydraulic pump 69 driven by the engine 60.
[0031]
As shown in FIG. 1, the engine 60 is disposed in front of the cooling unit 53, the periphery of the engine 60 is covered by an engine hood 71, and a boundary between the engine hood 71 and the counterweight 12 is formed. Exhaust ports 72 and 73 are opened in the upper and lower parts, respectively, and an upper guide 74 and a lower guide 75 that cover these exhaust ports 72 and 73 and guide the exhaust fluid forward are provided respectively.
[0032]
The exhaust ports 72 and 73 and the guides 74 and 75 vertically move along the airflow radially discharged from the circumferential portions of the cooling fans 64 and 65 in order to smoothly exhaust the cooling fans 64 and 65. It is installed in.
[0033]
In addition, sound absorbing members 76 and 77 are attached to at least the inner surface of the engine hood 71 facing the upper part of the engine and the inner surface of the front part. In the conventional engine hood, an exhaust opening was provided at a position facing the upper part of the engine, so that it was impossible to install a sound absorbing material at a position facing the upper part of the engine. By opening the exhaust ports 72 and 73 at the upper and lower portions of the boundary portion with the guides and installing the guides 74 and 75, the sound absorbing material 76 can also be attached to the inner surface of the engine hood at a position facing the upper portion of the engine.
[0034]
Next, the operation of this embodiment will be described.
[0035]
When the hydraulic motor for fan 66 is rotated by hydraulic oil pressurized and supplied from a hydraulic pump for fan 69 driven by the engine 60, the hydraulic motor for fan 66 rotates the hydraulic motor 66 via one pulley / belt type transmission mechanism 67. Is driven to rotate at a rotational speed suitable for the radiator capability, and the other cooling fan 65 is rotationally driven at a rotational speed suitable for the oil cooler capability via the other pulley / belt type transmission mechanism 68. .
[0036]
When the cooling fans 64 and 65 of these cooling units 53 are rotated, the radiator 61 is cooled by the air sucked from the outside through the ventilation holes 59 of the rear cover 58 by the suction force of one of the cooling fans 64, and The oil cooler 62 and the aftercooler 63 are cooled by air sucked from the outside through the ventilation holes 59 of the rear cover 58 by the suction force of the other cooling fan 65 having a different rotation speed.
[0037]
The hot air that has risen in temperature due to heat exchange with these cooling means and is radially exhausted from the circumferential portion of each of the cooling fans 64 and 65 is split vertically, and the boundary between the engine hood 71 and the counter weight 12 is formed. The exhaust gas is exhausted from exhaust ports 72 and 73 opened at the upper and lower portions of the vehicle and smoothly guided to the outside along an upper guide 74 and a lower guide 75 projecting from the engine hood 71 to be exhausted.
[0038]
Next, the effects of this embodiment will be listed.
[0039]
(1) A plurality of cooling fans 64 and 65 can supply necessary air volumes to the radiator 61 and the oil cooler 62, respectively.
[0040]
In particular, cooling fans 64 and 65, which are rotationally driven via a plurality of pulley / belt type transmission mechanisms 67 and 68, respectively, are provided for the radiator 61 and the oil cooler 62, and the radiator 61 is provided for each model and each specification of the hydraulic excavator. In order to supply the required air volume to each of the oil coolers 62 and the oil cooler 62, even with the common cooling unit 53, it is possible to satisfy the cooling conditions of various types by simply changing only the pulley ratio.
[0041]
(2) Since the oil coolers 62 are arranged in the machine width direction with respect to the radiator 61, there is no possibility that the oil cooler pipe 35, the air cleaner pipe 42, and the aftercooler pipes 43 and 44 are densely arranged as in the related art. Since the piping is easy to construct, a seal structure that does not involve hot air can be taken, and the structure is easy to assemble.
[0042]
(3) Since the cooling unit 53 is accommodated in the through space 51 of the counterweight 12, the layout is not restricted by the cooling unit 53, and the conventional cooling unit 27 is arranged. An extra space is created in the place where the space is located, and this extra space can be used effectively.
[0043]
That is, the through-hole 51 in the front-rear direction is provided in the counterweight 12 at the rear part of the body 11 with respect to the working device 15 at the front part of the body 11, and the cooling unit 53 is housed in the counterweight 12, so that the length of the body 11 in the front-rear direction can be increased. In addition to this, it is possible to improve the layout restriction of the cooling unit 53 while preventing the conventional cooling unit 27 (FIG. 7) from being provided with an extra space. By relocating FIG. 7) and the like, it is possible to greatly increase the fuel tank capacity and the like.
[0044]
(4) Since the flow rate of the hot air discharged from the cooling fans 64 and 65 of the cooling unit 53 is exhausted along the guides 74 and 75 protruding from the engine hood 71 in the vertical direction, the hot air is smoothly exhausted. Can be. Further, in the width direction of the airframe, that is, in the left-right direction, the cooling unit 53 can be arranged at the center in the width direction of the counter weight 12 without being restricted by the engine 60, as compared with the conventional type shown in FIG. Therefore, since the distance from the cooling unit 53 to the sill plate of the upper swing body 11 is longer, the exhaust resistance is reduced as compared with the conventional type, and more air volume can be exhausted at the same cooling fan rotation speed.
[0045]
(5) By providing the guides 74 and 75, the opening of the engine hood 71 can be limited to the exhaust ports 72 and 73 opened at the upper and lower portions of the boundary between the engine hood 71 and the counterweight 12. In addition, the sound absorbing material 76 can be stuck to the inner surface position of the engine hood 71 facing the upper part of the engine in the left-right direction, so that the noise leaked from the conventional engine hood opening above the engine can be reduced.
[0046]
【The invention's effect】
According to the first aspect of the present invention, since the cooling unit is housed in the through space of the counterweight, the layout is less likely to be restricted when the cooling unit is installed, and the place where the conventional cooling unit is disposed The extra space is generated, and this extra space can be used effectively.
[0047]
According to the second aspect of the present invention, the cooling unit is accommodated in the counterweight at the rear part of the body with respect to the working device at the front part of the body, so that the cooling unit is housed here. In addition to this, it is possible to improve the restrictions on the layout of the cooling unit while avoiding the problem.Also, there is an extra space in the place where the conventional cooling unit was arranged. A large increase in capacity and the like becomes possible.
[0048]
According to the third aspect of the present invention, the flow rate of the hot air discharged from the cooling unit is exhausted along the guide in the vertical direction, so that the hot air can be exhausted smoothly, and Compared with the conventional type, it is possible to arrange the cooling unit at the center in the width direction of the counter weight without being restricted by the engine, so the distance from the cooling unit to the side plate of the fuselage becomes longer, so the conventional type The exhaust resistance is reduced as compared with the above, and more air volume can be exhausted.
[0049]
According to the fourth aspect of the present invention, by providing the guide, the opening of the engine hood can be limited to the exhaust port opened at the boundary between the engine hood and the counterweight. The sound absorbing material can be installed at the inner surface position opposite to the above, and the noise leaked from the conventional engine hood opening above the engine can be reduced.
[0050]
According to the fifth aspect of the present invention, since the oil coolers are arranged in the width direction of the machine body with respect to the radiator, there is no possibility that the oil cooler pipes, the air cleaner pipes, and the like are densely arranged as in the related art. Therefore, a seal structure that does not involve hot air can be obtained, and the structure is easy to assemble. In addition, a required amount of air can be supplied to each of the radiator and the oil cooler from the plurality of cooling fans.
[0051]
According to the invention described in claim 6, the radiator and the oil cooler are each provided with a cooling fan that is rotationally driven via a plurality of pulley / belt type transmission mechanisms, and a radiator and an oil cooler are provided for each model and each specification of the working machine. Since the required air volume is supplied to each of the oil coolers, even a common cooling unit can satisfy the cooling conditions of many types by simply changing only the pulley ratio.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing one embodiment of a cooling unit mounting-related portion of a working machine according to the present invention.
FIG. 2 is a sectional view taken along line II-II of FIG.
FIG. 3 is a plan view schematically showing an arrangement of a cooling unit and a cooling fan drive system.
FIG. 4 is an explanatory front view schematically showing a cooling fan drive system according to the first embodiment;
FIG. 5 is a side view showing an embodiment of the working machine according to the present invention.
FIG. 6 is a side view showing a conventional working machine.
FIG. 7 is a perspective view showing a cooling unit mounting-related portion of a conventional working machine.
[Explanation of symbols]
11 Upper revolving superstructure 12 as a body 12 Counter weight 15 Working device 51 Through space 53 Cooling unit 60 Engine 61 Radiator 62 Oil cooler 64, 65 Cooling fan 66 Hydraulic motor for fan 67, 68 as motor Motor with pulley / belt transmission 71 Engine Hood 72, 73 Exhaust port 74, 75 Guide 76, 77 Sound absorbing material

Claims (6)

A working device mounted on one side of the fuselage,
A counter weight mounted on the other side of the aircraft with respect to this work device,
A penetration space provided through the counterweight,
A work machine comprising: a cooling unit for cooling housed in a through space of a counterweight. A working device mounted on the front of the aircraft,
A counterweight mounted on the rear of the aircraft,
A penetration space provided through the counterweight in the front-rear direction,
A work machine comprising: a cooling unit for cooling housed in a through space of a counterweight. An engine located in front of the cooling unit,
An engine hood that covers the periphery of the engine,
An exhaust port opened on at least one of an upper portion and a lower portion of a boundary portion between the engine hood and the counter weight,
The work machine according to claim 2, further comprising a guide that covers the exhaust port and guides the exhaust fluid forward. 4. The working machine according to claim 3, further comprising a sound absorbing material installed at least on an inner surface of the engine hood facing the upper part of the engine. The cooling unit is
A radiator for cooling the engine cooling water,
An oil cooler arranged in the width direction of the fuselage with respect to the radiator to cool hydraulic oil in a hydraulic circuit;
The work machine according to any one of claims 1 to 4, further comprising a plurality of cooling fans arranged for the radiator and the oil cooler, respectively. Multiple cooling fans
The work machine according to claim 5, wherein each of the work machines is rotationally driven by a common motor via a plurality of pulley / belt type transmission mechanisms.

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