JPH08334024A - Radiator device of construction machine - Google Patents

Abstract

PURPOSE: To improve cooling efficiency, and also reduce a noise by smoothly exhausting air from an exhaust part arranged in a machine body cover of a radiator device. CONSTITUTION: In a radiator device of a construction machine to deliver a passing wind W from a radiator 18 from an exhaust part 33 formed in a machine body cover 20 to cover an engine 17, wind guiding wall parts 41, 42a and 42b are arranged between the radiator 18 and the machine body cover 20. Wall parts 41, 4a and 4b are arranged in the vicinity of a peripheral edge part of the radiator 18 and in the vicinity of the axis of a radiator fan 31.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radiator device for a construction machine.

[0002]

2. Description of the Related Art In a conventional construction machine such as a backhoe, a water-cooled engine is installed on a machine frame, a machine cover for covering the engine is installed, and a radiator is installed in the machine cover. There is. Then, the radiator fan blows air toward the radiator,
The passing air (hot air) from the radiator is exhausted from the exhaust portion formed on the body cover.

Further, in order to facilitate maintenance around the engine, the machine body cover is usually composed of a cover body and a bonnet, and an exhaust portion for discharging the passing air from the radiator to the outside is covered. A first exhaust port formed on the main body and a second exhaust port formed on the bonnet
Some consist of an exhaust port.

[0004]

However, the passing air from the radiator is not discharged smoothly and surely from the exhaust portion, and it circulates above and to the left and right of the radiator and flows backward.
In some cases, the cooling efficiency of the radiator was deteriorated. There is also a demand to reduce noise generated in the radiator device, especially when the construction machine is used in an urban area.

Further, in the vicinity of the axial center of the radiator fan,
Since the air blowing capacity is lower than that of the peripheral portion, the wind speed and air volume near the axial center and the peripheral portion are different, so that the wind at the peripheral portion is caught in the axial center side, and the radiator and the body cover Turbulent air flow may occur between and, and smooth exhaust may not be performed. Further, in the case where the machine body cover is composed of the cover main body and the bonnet, the abutting edge portions of the cover main body and the bonnet are used when the passing air from the radiator is discharged to the outside from the first exhaust port and the second exhaust port. It becomes an obstacle, and turbulence occurs due to the passing wind colliding with the abutting edge portion,
This obstructs the smooth discharge of the passing air to the outside, which may deteriorate the cooling efficiency of the radiator.

Therefore, the present invention is configured to guide the passing air from the radiator so that the passing air is smoothly discharged from the exhaust portion, thereby improving the cooling efficiency of the radiator and generating in the radiator device. The purpose is to reduce the noise generated.

[0007]

In order to achieve the above object, the present invention takes the following technical means. That is,
The present invention relates to a radiator device for a construction machine, which discharges a passing wind from a radiator through an exhaust port formed in a body cover that covers an engine, a wind that guides the passing wind from the radiator to the exhaust port in the vicinity of a peripheral portion of the radiator. A guide wall portion is provided, and the wind guide wall portion is characterized by being made of a sound absorbing material.

Therefore, the passing air from the radiator is
Since it is guided by the wind guide wall portion and is discharged from the exhaust port formed in the body cover, the passing wind is prevented by the wind guide wall portion from circling upward, downward, and left and right of the radiator and flowing backward. Smooth exhaust is performed, and the radiator cooling efficiency is improved. Further, since the wind guide wall portion having such an action is made of the sound absorbing material, it simultaneously exerts the action of reducing the noise, simplifies the structure, and reduces the number of constituent members, but at the same time, the air flow of the radiator is reduced. Smooth exhaust and noise reduction are achieved.

Further, according to the present invention, in a radiator device of a construction machine for discharging a passing wind from a radiator from an exhaust portion formed in a body cover for covering an engine, by the time the wind passing through the radiator is exhausted from the exhaust portion, In order to prevent turbulent airflow in the airframe cover, a pair of wind guide wall portions that widen apart from the radiator at a position between the radiator and the airframe cover and at a position corresponding to the widthwise middle portion of the radiator. Was arranged. By this wind guide wall portion, a plurality of flow passages having a shape, size and arrangement suitable for smooth exhaust are sectioned and formed so that turbulent air flow is prevented from occurring and the cooling efficiency by the radiator device is improved.

Further, according to the present invention, there is provided a radiator provided inside a body cover for covering the engine and a radiator fan for blowing air toward the radiator, and an exhaust section for discharging the passing air from the radiator to the outside of the body cover. In the formed construction machine radiator device, in order to prevent generation of turbulent airflow in the vicinity of the fan axis due to the characteristics of the radiator fan, between the radiator and the fuselage cover, and in the vicinity of the radiator fan axis. , A pair of wind guide walls that spread apart from the radiator. The wind guide wall portion prevents the wind blown from the peripheral portion of the fan from being caught in the center of the fan shaft, and allows the passing wind from the radiator to be smoothly exhausted from the exhaust unit, thereby providing a radiator device. The cooling efficiency can be improved.

Further, according to the present invention, there is provided a radiator provided in a body cover for covering the engine and a radiator fan for blowing air toward the radiator, and an exhaust portion for discharging the passing air from the radiator to the outside of the body cover. A radiator device for a construction machine, wherein the airframe cover includes a cover body and a bonnet, and the exhaust unit includes a first exhaust port formed in the cover body and a second exhaust port formed in the bonnet. A wind guide wall portion that guides the passing air from the radiator to the first exhaust port and the second exhaust port is provided near the peripheral portion of the radiator and the axial center of the radiator fan and between the radiator and the body cover. It is characterized by being installed.

According to this structure, the passing air from the radiator is guided by the wind guide wall portions arranged near the peripheral portion of the radiator and near the axial center of the radiator fan, and the first exhaust port and the second exhaust port are provided. As a result, the radiator is cooled efficiently, as described above. On the other hand, even if the wind guide wall is arranged near the axis of the radiator fan, generally, since the amount of air blown is relatively small near the axis of the fan, the wind guide wall causes turbulence in the passing air from the radiator. It hardly occurs, so that the passing air is smoothly discharged from the radiator, and the radiator cooling efficiency is improved.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. 1 to 5 show a first embodiment of the present invention, in which a construction machine 1 of the present embodiment is an excavating work machine also called a rear small turning type backhoe, and has a crawler traveling device 2. The machine body 3 is provided. A turning machine body 4 is supported on the traveling machine body 3 so as to be capable of turning around a vertical axis, and a dozer device 5 is mounted on the front portion of the traveling machine body 3.

The swivel body 4 is generally circular in plan view as a whole, and the rear part thereof is formed in an arc shape centering on the swivel shaft 16, and the left and right side parts are formed in a notch shape in the front-rear direction, and these left and right parts are formed. The side surfaces are configured to be substantially parallel to each other, and the front portion is configured to be cutout in the left-right direction. The turning radii of almost all the devices / equipment constituting the turning machine body 4 are made smaller than the turning radius of the rear end portion of the turning machine body 4, and
The turning radius of the rear end portion of the turning machine body 4 (the maximum turning radius of the turning machine body 4) is made substantially the same as or slightly smaller than the left and right crawler widths to improve the workability of turning and the work in narrow spaces.

A backhoe device 6 (excavation work device) is mounted on the front portion of the body frame 4a of the turning body 4.
The device 6 is mounted on the bracket 8 which is attached to the front part of the machine body frame 4a so as to be able to swing left and right by the extension and contraction operation of the swing cylinder 7, and is attached to the bracket 8 which is vertically swingable by the extension and contraction operation of the boom cylinder 9. The boom 10 and the arm 12 attached to the tip of the boom 10 so as to be capable of swinging back and forth by the extension and contraction of the arm cylinder 11, and the arm 12 that is swept and swingable by the extension and contraction of the bucket cylinder 13 are attached to the end of the arm 12. Bucket 14.

A counterweight 15 is mounted on the rear portion of the frame 4a of the swivel body 4 to optimize the weight balance between the front and rear of the swivel body 4. In particular, in the turning type backhoe 1 as in the present embodiment, the frame 4
The counterweight 15 is indispensable in order to reduce the moment generated on the swivel shaft 16 by the weight of the backhoe device 6 attached to the front part of a, to ensure a smooth swiveling motion and to prevent overturning. Bolt holes 59 are formed at the left and right ends of the counterweight 15, and the fuselage frame 4 is bolted using the bolt holes 59.
It is attached and fixed to a. Further, the rear surface side of the counterweight 15 is formed in a substantially arcuate shape in a plan view, and the weight 15 is configured to fit within the turning radius of the turning machine body 4, thereby improving workability in a narrow space.

On the frame 4a of the swivel body 4,
The engine 17 is equipped and the engine 17
A radiator 18, an oil cooler 19 and the like are provided on the right side of the engine 18, the engine 17, the radiator 18, the oil cooler 19, the swing cylinder 7 and the like are covered by a body cover 20. The engine 17 is a water-cooled three-cylinder type engine, and has an exhaust port portion 21 of an exhaust manifold 21.
A main muffler 23 is connected to a via a connection pipe 22. A rectangular hollow pre-muffler 2 is provided between the connection pipe 22 and the exhaust manifold 21.
4 is interposed, the power of the sound propagated to the pipe diameter before reaching the main muffler 23 is reduced to some extent, and the noise is further reduced.

Here, the pre-muffler 24 is directly attached and fixed to the exhaust port portion 21a of the exhaust manifold 21 by a bolt or the like. Therefore, the exhaust manifold 21 is attached to fix the pre-muffler 24 to the engine 16. It is made with a bracket. Therefore, a separate mounting bracket is not required, the structure can be simplified, the number of constituent members can be reduced, the manufacturing cost can be reduced, and the device can be made compact. Further, since the pre-muffler 24 and the exhaust manifold 21 are directly attached, there is no need to connect them by using the flexible piping, which can also reduce the cost. .

The side wall 24a of the pre-muffler 24, which is bolted to the exhaust port portion 21a, preferably has a relatively large wall thickness to improve the mounting strength. As the pre-muffler 24, a silencer made of an expansion type, a resonance type, an interference type or a sound absorbing type, or a combination thereof can be adopted. Similarly, the main muffler 23 is also an expansion type, a resonance type,
A silencer made of an interference type, a sound absorbing type, or a combination thereof can be adopted.

The counterweight 15 is hollow, and a connection hole 25 is formed in the center of the inner wall 15a of the counterweight 15. The connection hole 25 has an exhaust port 23 of the main muffler 23.
a is connected, and a bellows-shaped heat-resistant rubber cover 61 is attached to the exhaust port 23a. An exhaust hole 26 is formed in the outer wall portion 15b of the counterweight 15 at approximately the center thereof, and the counterweight 15 constitutes an inflatable sub muffler (auxiliary silencer). That is, the internal space 2 of the hollow counterweight 15
Reference numeral 7 is an expansion chamber.

In the counterweight 15, a lower opening-shaped main body portion 28 is formed by casting, and a bottom plate 29 is bolted to the bottom surface of the main body portion 28 via a seal (not shown).
It is configured by fixing by. According to this, the core of the casting becomes unnecessary, and it is possible to improve the productivity and reduce the manufacturing cost. As shown in FIG. 6, the exhaust port portion 23a of the main muffler 23 is penetrated through from the connection hole 25 of the counterweight 15 to the exhaust hole 26, and the counterweight 15 is provided in the middle of the exhaust port portion 23a. Branch opening 23b opening into the inner space 27 of the
May be provided, and in this case, the internal space 27 of the counterweight 15 acts as a resonance chamber, and the counterweight 15 is a resonance-type sub muffler.

If the sub-muffler is constructed by the counter weight 15 as described above, a relatively large expansion chamber or resonance chamber is secured, and the sub-muffler 15 can suppress the sound in the range where the main muffler 23 has less muffling effect. However, it is possible to reduce the overall size without requiring a special arrangement space.

The radiator 18 is vertically installed on the right side of the engine 17, and a radiator fan 31 for blowing air toward the radiator 18 is installed inside the radiator 18. This radiator fan 31
Is rotatively driven by the rotational power of the engine 17, its axial center is in the left-right width direction, is surrounded by the fan cover 32 attached to the radiator 18, and efficiently blows air toward the radiator 18. ing.

The passing air W from the radiator 18 is discharged to the outside from an exhaust portion 33 formed on the side wall of the body cover 20. In the present embodiment, the machine body cover 20 includes the cover body 3 fixed to the machine body frame 4a.
4 and a bonnet 36 that is openably and closably attached to the cover body 34 via a hinge 35 to open and close the engine compartment. The exhaust part 33 is formed on a side wall part of the cover body 34. The first exhaust port 37 and the second exhaust port 38 formed in the bonnet 36 are included. The axial center of the radiator fan 31 is substantially overlapped with the boundary line between the cover body 34 and the hood 36 in a plan view. In addition, the side wall of the cover body 34 has a flat plate shape extending in the front-rear direction in the portion where the first exhaust port 37 is provided, and the side wall of the bonnet 36 is the swivel shaft in the portion where the second exhaust port 38 is provided. 1
6 is a curved plate shape having an arc shape in a plan view, and the opening directions of the first exhaust port 37 and the second exhaust port 38 are open outward.

The first exhaust port 37 and the second exhaust port 38 of the present embodiment are formed by arranging a plurality of elongated holes extending in the left-right direction in the vertical direction. It can be The passing air W from the radiator 18 is arranged so that the passing air W from the radiator 18 can be efficiently and smoothly exhausted from the first exhaust port 37 and the second exhaust port 38.
The wind guide wall portions 39, 40, 41, 42 for guiding the air to the first exhaust port 37 and the second exhaust port 38 are near the peripheral portion of the radiator 18 and near the axial center of the radiator fan 32, and the radiator 18 and the machine body. It is arranged between the cover 20 and the cover 20.

The wind guide wall portion 39 near the upper edge portion of the radiator 18 is fixed to an L-shaped bracket 43 fixed to the upper end portion of the radiator 18, and the outer edge portion thereof is pressed against the inner surface of the body cover 20. Therefore, the passing wind W is prevented from leaking. Further, the wind guide wall portion 40 near the lower edge portion of the radiator 18 is fixedly mounted on the support wall portion 44 that supports the radiator 18, and the outer edge portion thereof is also pressed against the inner surface of the machine body cover 20. . Generally, in the construction machine 1 according to the present embodiment, the structure of the lower portion of the radiator 18 is often complicated, and accordingly, there are many gaps having a complicated shape. 40 can prevent such a gap.

The upper and lower wind guide walls 39, 40 are made of foaming sound absorbing material, and the noises generated in the engine 17, the radiator fan 31 and their surroundings are discharged from the exhaust portion 33 to the outside. It effectively prevents the leak. Wind guide wall 41 near the front edge of the radiator 18
Is disposed on the rear surface side of the oil tank 45, and is formed continuously from the front edge of the radiator 18 to the front end of the first exhaust port 37 without any gap. The inner surface side of the wind guide wall portion 41 is composed of the sound absorbing material 46,
It is intended to reduce the leakage of noise generated by the radiator fan 31 and the like from the exhaust unit 33. The sound absorbing material 46 is attached to the support column of the wind guide wall portion 41 by an adhesive seal or the like.

The wind guide wall portion 42 near the axial center of the radiator fan 31 has a substantially V shape in plan view, and the radiator 18
A first exhaust passage 47 which is disposed at a position corresponding to the middle portion in the width direction of the first exhaust passage 37, which guides the passing air W from the radiator 18 to the first exhaust port 37 in the space on the right side of the radiator 18.
The passing airflow W from the radiator 18 is divided into a second exhaust passage 48 that guides it to the second exhaust port 38. The V-shaped top portion of the wind guide wall portion 42 is directed toward the radiator 18 side, and the passing wind W from the radiator 18 is smoothly divided into the first exhaust passage 47 and the second exhaust passage 48. .

That is, the wind guide wall portion 42 is formed by connecting a pair of front and rear wind guide wall portions 42a and 42b so as to have a substantially V shape in a plan view.
The a and 42b are configured to expand as they move away from the radiator 18. In the illustrated embodiment, the expanding direction of the pair of guide wall portions 42a and 42b corresponds to the opening direction of the first exhaust port 37 and the second exhaust port 38.

Incidentally, the first exhaust passage 4 of the wind guide wall portion 42.
The side surface facing the seventh and second exhaust passages 48 is also made of a sound absorbing material 49 to reduce noise. Since the rear end edge of the radiator 18 is close to the rear end portion of the second exhaust port 38 of the bonnet 36, no wind guide wall portion is provided in this portion. According to the configuration of the radiator device according to the present embodiment described above, the radiator 1
The passing wind W from 8 is applied to each wind guide wall portion 39, 40, 41,
Since it is guided by 42 and is discharged from the exhaust ports 37, 38 formed in the machine body cover 20, it is possible that the passing wind W circulates upward, downward, and left and right of the radiator 18 and flows backward. , 40, 41, 42, the exhaust is smoothly performed, and the radiator 18 has a good cooling efficiency. Further, since the wind guide wall portions 39, 40, 41, 42 having such an action are made of a sound absorbing material, they simultaneously have an action of reducing noise,
Smooth exhaust of the passing air W from the radiator 18 and noise reduction are achieved while simplifying the structure and reducing the number of constituent members.

Further, by constructing the machine body cover 20 from the cover body 34 and the bonnet 36, the passing wind W from the radiator 18 collides with the adjacent edge portions of the cover body 34 and the bonnet 36 to generate turbulent airflow. Deterioration of efficiency is prevented by the wind guide wall portion 42 provided near the axis of the radiator fan 31, and generally, since the amount of blown air is relatively small near the axis of the fan, the wind guide wall portion 42 causes the radiator 18 to move. There is almost no turbulence in the passing air W from the radiator 18, so that the passing air W is smoothly discharged from the radiator 18 and the cooling efficiency of the radiator 18 is improved.

In the construction machine 1 of this embodiment, the driver's seat 51 is provided on the machine body cover 20, and the driver's seat 51 is provided.
Various operation levers 52 are provided in front of. Also,
A pair of left and right canopy support posts 53 are provided on the swivel body 4 so as to project upward, and a canopy 54 is attached and fixed to the upper part of the support posts 53. Moreover, the fall of earth and sand near the driver's seat 51 is prevented.

Further, the engine 17 includes an oil motor 5
5. An air cleaner 56 is attached. An inlet silencer 57 is connected to the intake side of the air cleaner 56. The silencer 57 is provided with a resonance chamber 58 having the same resonance frequency as those frequencies in order to reduce primary and secondary low frequency sounds generated in the engine 17.

That is, this inlet silencer 57
As shown in FIG. 7, a resonance chamber 58 is provided on the outer peripheral portion of the air circulation pipe portion 59, and the circulation pipe portion 59 and the resonance chamber 58 are communicated with each other through a communication pipe portion 60. A part of the air flowing through the portion 59 is introduced into the resonance chamber 58 so that the sound is silenced by the resonance action. In such an inlet silencer 57, generally, the larger the amount of air introduced into the resonance chamber 58, the greater the sound deadening effect.
Is bent into a substantially L shape, and the air introduction end portion 60a thereof is opened to the intake port side, thereby increasing the amount of air flowing into the resonance chamber 58.

It should be noted that, as shown in FIG. 8, the communication pipe portion 60 may be obliquely attached to open the air introduction end portion 60a toward the intake port side, and as shown in FIG. 9, the communication pipe portion 60 may be opened. The end portion 60a can be opened to the intake port side by cutting the air introduction end portion 60a at an angle.
Also, as shown in FIG. 10, the inner diameter d1 of the flow pipe 59 is
By making the diameter larger than the inner diameter d2 of the connection pipe, the flow pipe portion 59 can have the function of an expansion silencer, and the noise can be further reduced in combination with the silencing effect of the resonance chamber 58. it can.

11 to 13 show a second embodiment of the present invention. The same components as those in the first embodiment are designated by the same reference numerals and detailed description thereof will be omitted. The effects will be described. In the present embodiment, the V-shaped top portion of the wind guide wall portion 42, which is arranged between the radiator 18 and the machine body cover 20 and at a position corresponding to the middle portion in the width direction of the radiator 18, has a V-shaped top portion in front of and behind the radiator 18. It is arranged to be slightly positioned in front widthwise central portion (shown in Figure 11 O _R) than.

Further, the radiator fan 31 is arranged to be slightly posterior than longitudinal width direction central portion O _R of the axis (11 indicated by O _F) is the radiator 18. Therefore, regarding the relationship between the radiator fan 31 and the wind guide wall portion 42, although the wall portion 42 is arranged near the axial center of the radiator fan 31, the radiator fan 31
The wall portion 42 does not overlap with the extension line of the axis. However, a part of the wind guide wall portion 42 (the rear side wall portion 42b in the illustrated embodiment) is located in the axially extended region of the core portion 31a of the fan 31.

The wind guide wall portion 42 is the upper wind guide wall portion 3
9 and the support brackets 72, 73 on the lower wind guide wall portion 40.
It is attached and fixed in the upper and lower parts via. Upper wind guide wall 39, front wind guide wall 41 and lower wind guide wall 4
As shown in FIG. 13, 0 is integrally formed of a steel plate having a substantially U-shape in side view. It is preferable to add a sound absorbing material to the inner surface of the steel sheet.

The upper wind guide wall portion 39, the front wind guide wall portion 41 and the lower wind guide wall portion 40 are attached and fixed to the machine body frame 4a via a support member 71 and the like. The bonnet 36 is configured compactly so that only the rear side of the engine 17 can be opened, and accordingly, the radiator device is almost covered by the cover body 34. Therefore, the exhaust portion 33 of the radiator device
The abutting edges of the bonnet 36 and the cover body 34 do not exist in the area where the hood 36 is provided, and the first exhaust port 37 and the second exhaust port 38 that form the exhaust unit 33 are both provided on the side wall of the cover body 34. There is. In this embodiment, the first exhaust port 37 and the second exhaust port 38 may be continuous to form one elongated hole.

FIG. 14 shows a third embodiment of the present invention, except that the axis of the radiator fan 31 and the top of the substantially V-shaped wind guide wall 42 are substantially aligned with each other. Since the second embodiment is the same as the second embodiment, the same reference numerals are given and detailed description will be omitted. The present invention is not limited to the above-mentioned embodiments, and can be appropriately modified in design.

[0041]

As described above, according to the present invention,
By guiding the passing wind from the radiator by the wind guide wall section that is arranged between the radiator and the machine cover, it can be discharged smoothly and reliably from the exhaust section formed in the machine cover, preventing the occurrence of turbulence By doing so, it is possible to improve the cooling efficiency of the radiator.

Further, the wind guide wall portion near the peripheral portion of the radiator can prevent the passing wind from wrapping around the radiator above, below and to the left and right sides and flowing backward, thereby further improving the cooling efficiency of the radiator. Since this wind guide wall is made of a sound absorbing material, it has the effect of simultaneously reducing noise, simplifies the structure, and reduces the number of constituent members, while at the same time exhausting the air passing through the radiator. Smoothness and noise reduction can be achieved.

Further, since a pair of wind guide wall portions that expand with distance from the radiator are provided between the radiator and the machine body cover and at a position corresponding to a middle portion in the width direction of the radiator, this wind guide wall is provided. By the wall portion, a plurality of flow passages having a shape, size and arrangement suitable for smooth exhaust can be defined and formed, and turbulent air flow can be prevented from being generated between the radiator and the body cover to further improve cooling efficiency. It is possible to improve.

Further, since a pair of wind guide wall portions, which expands as they move away from the radiator, are arranged between the radiator and the machine body cover and in the vicinity of the axial center of the radiator fan, the wind guide wall portions are provided. , It is possible to prevent the air sent from the fan peripheral part from being caught in the central part of the fan shaft center, and to allow the passing air from the radiator to be smoothly exhausted from the exhaust part, which results from the characteristics of the radiator fan. It is possible to improve the cooling efficiency of the radiator by preventing the generation of turbulence near the heart.

Further, since the passing air from the radiator is guided by the wind guide wall portions provided in the vicinity of the peripheral portion of the radiator and in the vicinity of the axial center of the radiator fan, it is discharged from the first exhaust port and the second exhaust port. In spite of the fact that the exhaust part is formed over the cover body and the bonnet, the cooling efficiency of the radiator can be made good as described above, and the wind guide wall part is provided in the vicinity of the axial center of the radiator fan. Even if it is installed, since the amount of air blown is relatively small in the vicinity of the fan's axis, turbulence is rarely produced in the air passing through the radiator by the wind guide wall, so the air passing through the radiator is discharged. Can be performed smoothly, and the radiator cooling efficiency can be improved.

[Brief description of drawings]

FIG. 1 is a plan sectional view showing a main part of a construction machine according to a first embodiment of the present invention.

FIG. 2 is a schematic view showing a relationship between respective parts inside the bonnet.

FIG. 3 is a side view of the construction machine.

FIG. 4 is a rear view of the construction machine.

FIG. 5 is a simplified side sectional view showing a relationship between a main muffler and a counter weight.

FIG. 6 is a plan cross-sectional view schematically showing another example of the relationship between the main muffler and the counter weight.

FIG. 7 is a sectional view showing an example of an inlet silencer.

FIG. 8 is a cross-sectional view showing an example of an inlet silencer.

FIG. 9 is a sectional view showing an example of an inlet silencer.

FIG. 10 is a sectional view showing an example of an inlet silencer.

FIG. 11 is a sectional plan view showing a main part of a second embodiment of the present invention.

FIG. 12 is a rear view of the same.

FIG. 13 is a side view of the same.

FIG. 14 is a sectional plan view showing a main part of a second embodiment of the present invention.

[Explanation of symbols]

1 Construction Machinery 17 Engine 18 Radiator 20 Airframe Cover 31 Radiator Fan 33 Exhaust Section 34 Cover Body 36 Bonnet 37 First Exhaust Port 38 Second Exhaust Port 39 Wind Guide Wall Near the Upper Edge of Radiator 40 Near Lower Edge of Radiator Wind guide wall portion 41 Wind guide wall portion near the front edge of the radiator 42 Wind guide wall portion near the axial center of the radiator fan 42a, 42b Pair wind guide wall portion (Wind guide wall portion near the axial center of the radiator fan )

Claims (4)

[Claims] 1. A fuselage cover (2) for covering an engine (17).
(1) to the radiator (1)
In the radiator device of the construction machine for discharging the passing wind (W) from (8), in the vicinity of the peripheral portion of the radiator (18) and in the radiator (1
8) and the fuselage cover (20) between the radiator (1
A wind guide wall portion (39, 40, 41) for guiding the passing wind (W) from 8) to the exhaust portion (33) is provided,
A radiator device for a construction machine, wherein the wind guide wall portions (39, 40, 41) are made of a sound absorbing material. 2. A fuselage cover (2) for covering the engine (17).
(1) to the radiator (1)
In the radiator device of the construction machine for discharging the passing wind (W) from (8), the radiator is provided between the radiator (18) and the machine body cover (20) and at a position corresponding to a midway portion in the width direction of the radiator (18). A radiator device for a construction machine, characterized in that a pair of wind guide wall portions (42a, 42b) is provided which spreads away from (18). 3. A fuselage cover (2) for covering the engine (17).
0) and a radiator fan (3) for blowing air toward the radiator (18) installed in the radiator (18).
1) and, passing wind (W) from the radiator (18)
Exhaust part (33) for discharging air to the outside is a fuselage cover (20)
In the radiator device for a construction machine formed in the above, in the radiator device (18) and the machine body cover (20) and in the vicinity of the axial center of the radiator fan (31), it spreads away from the radiator (18). A radiator device for a construction machine, wherein a pair of wind guide wall portions (42a, 42b) are provided. 4. A fuselage cover (2) for covering the engine (17).
0) and a radiator fan (3) for blowing air toward the radiator (18) installed in the radiator (18).
1) and, passing wind (W) from the radiator (18)
Exhaust part (33) for discharging air to the outside is a fuselage cover (20)
The fuselage cover (20) is formed into a cover body (34).
And a hood (36), and the exhaust part (3
The radiator device of the construction machine (3) comprises a first exhaust port (37) formed in the cover body (34) and a second exhaust port (38) formed in the bonnet (36). ), A wind guide wall portion (39, 40, 41, 42) for guiding the passing wind (W) from the radiator (18) to the first exhaust port (37) and the second exhaust port (38) is near the peripheral portion of the radiator (18). And a radiator device for a construction machine, which is arranged in the vicinity of an axial center of a radiator fan (31) and between the radiator (18) and a machine body cover (20).