JP2000211378A - Engine intake system of construction equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an engine inlet system which improves space efficiency by eliminating dead space. SOLUTION: This engine intake system is provided with an air inlet port 117A for taking in combustion air for an engine 4, an air cleaner 117 for cleaning the air, and an intake pipe 118 for leading the purified air to the engine 4. The intake system is installed on a construction equipment provided with a radiator 116a for cooling cooling water of the engine 4, and a cooling fan 123 for inducing cooling wind for cooling an oil cooler 116b, the engine 4, the radiator 116a, and an oil cooler 116b. The air inlet port 117A and the air cleaner 117 are disposed on a side opposite the engine with respect to the radiator 116a and the oil cooler 116b. The intake pipe 118 passes an area above the radiator 116a and the oil cooler 116b while connecting the air cleaner 117 and the engine 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine intake device for a construction machine that guides combustion air to an engine provided in the construction machine.

[0002]

2. Description of the Related Art A hydraulic excavator, which is an example of a construction machine,
In general, a lower traveling structure, an upper revolving structure rotatably provided on the lower traveling structure, and an articulated front mechanism provided at a front portion of the upper revolving structure and including a boom, an arm, a bucket, and the like. It is configured.

At this time, the operating members such as the boom, the arm, the bucket, the upper swing body, and the lower traveling body are usually driven by a hydraulic actuator such as a hydraulic cylinder and a hydraulic motor. The hydraulic shovel is provided with a hydraulic pump as a hydraulic source of the hydraulic actuator, and the hydraulic pump is driven by an engine. Generally, these hydraulic pumps and engines are mounted on an upper swing body together with various devices, and are covered with covers.

FIG. 7 shows an example of the arrangement of devices in the upper revolving superstructure.

In FIG. 7, a driver's cab 3 having a seat 2 and an operation lever (not shown) is provided on the left side in front of the upper revolving superstructure 1.
Is provided. Although almost all parts of the upper revolving unit 1 other than the cab 3 are covered with a cover, FIG.
Shows the arrangement of internal devices with the cover removed.

That is, a fuel tank 5 for storing fuel of an engine 4 (described later) and a hydraulic oil tank 7 serving as a pressure oil source of a hydraulic pump 6 (the same) are provided on the front right side inside the cover of the upper swing body 1. , A tool box 8 are provided. A control valve device 9 for controlling pressure oil from the hydraulic pump 6 is provided in a substantially central region in the cover of the upper swing body 1. The control valve device 9 supplies the hydraulic oil from the hydraulic pump 6 to the above-described hydraulic actuator in response to the operation of the operation lever by the operator in the cab 3. A turning motor 11 that is one of the hydraulic actuators described above and that turns the upper swing body 1 with respect to the lower traveling body 10 is disposed in front of the control valve device 9.

Further, a counterweight 12 is provided at the rearmost part of the upper swing body 1. An engine room 13 in which the engine 4 is provided is formed in front of the counterweight 12 and behind the control valve device 9 and the cab 3. The engine room 13 and the cab 3 are separated by a rear wall 14 of the cab, and the engine room 13 and the control valve device 9 are separated by a substantially L-shaped side wall 15.

In the engine room 13, the hydraulic pump 6, which is connected to the engine 4 and is driven by its driving force, a heat exchanger 16 such as a radiator for circulating and supplying cooling water for the engine 4, and cooling the same. An air cleaner 17 having an air suction port for sucking air for combustion of an engine, for purifying air introduced from the air suction port, an intake pipe 18 connected to the air cleaner 17 and leading purified air to the engine 4, Muffler 19 which guides exhaust gas to muffle the exhaust gas and engine 4
Various devices such as a battery 20 as a power source at the time of startup are stored.

At this time, in order to cool the engine 4 and each device in the engine room 13, the cooling fan (same) is rotated by the driving force of a crankshaft (not shown) of the engine 4, and Cooling air is drawn in from an intake hole (not shown) provided on the side (lower side in FIG. 7), and after cooling the heat exchanger 16 such as a radiator, the engine 4 and the hydraulic pump 6 are further cooled to cover the cover. The air is discharged to the outside from an exhaust hole (not shown) provided on the other side (upper side in FIG. 7).

Here, the above-described air cleaner 17 and the intake pipe 18 constitute an engine intake device for guiding combustion air to the engine 4. This engine intake device is usually constructed in consideration of the following. .

First, the output of the engine 4 largely depends on the temperature of the intake air, and the output of the engine 4 decreases when the temperature of the intake air becomes high. Therefore, it is necessary to suck in the air having the lowest possible temperature (close to the atmospheric temperature) from the air inlet. Second, even if relatively low-temperature air is sucked in from the air suction port, the air cleaner
If the air cleaner 7 itself is in a position exposed to hot air, the air cleaner 17 will be heated by the air cleaner 17.
It must not be exposed to hot air.

In FIG. 7, in consideration of the above points, an air cleaner 17 having an air suction port is provided on the front side of the heat exchanger 16 (so-called radiator chamber).
A relatively low temperature air before the heat exchanger 16 is cooled and the temperature is raised can be sucked, and the air cleaner 17 is prevented from being exposed to the high temperature air. In addition, corresponding to the arrangement of the air cleaner 17 on the front side of the heat exchanger 16 as described above, the intake pipe 18 connecting the air cleaner 17 and the engine 4 is substantially L-shaped once from the side of the heat exchanger 16. After passing through the side wall 15 of the engine room 13 and circumventing the heat exchanger 16, it passes through the side wall 15 again into the engine room 13 and is returned to the intake system of the engine 4. .

[0013]

In recent years, for use on a relatively small excavation site, for example, the turning radius at the time of the minimum turning posture in which the boom is swung up to the maximum and the front mechanism is closest to the cab side is turned upward. Many small construction machines have been proposed, such as a so-called small-swing-back hydraulic excavator, which has a diameter equal to or smaller than the diameter of the turning frame at the lower part of the body. In such a small construction machine, the space in the cover of the upper swing body is extremely limited, and it is necessary to devise the arrangement of the devices in the cover so that the space is not wasted and can be effectively used.

However, in the above conventional structure,
As described above, since the intake pipe 18 penetrates through the substantially L-shaped side wall 15 and goes out of the engine room 13 to bypass the heat exchanger 16, the substantially L of the side wall 15 located on the side of the heat exchanger 16 is formed. The character-shaped inner region 21 becomes a useless space used only for the detour, and the space efficiency is reduced. Therefore, it is difficult to arrange all the devices to be mounted in the upper swing body in the upper swing body.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an engine intake device capable of improving space efficiency by eliminating waste of space in an upper swing body.

[0016]

(1) In order to achieve the above object, the present invention provides an engine disposed in an engine room of an upper-part turning body, a radiator for cooling a cooling water of the engine, and a hydraulic system. An oil cooler that cools hydraulic oil for driving the actuator, the engine, the radiator,
And an air suction port provided on a construction machine having a cooling fan for inducing a cooling wind for cooling an oil cooler, for sucking combustion air of the engine, and an air cleaner for purifying air introduced from the air suction port. An intake pipe for guiding air purified by the air cleaner to an engine, and wherein the air suction port and the air cleaner are provided on an engine intake side of a construction machine provided on a side opposite to the engine of the radiator and the oil cooler. In the device, the intake pipe connects the air cleaner and the engine while passing through a region above the radiator and the oil cooler.

As a result, there is no need for a wasteful space required to route the intake pipe so as to bypass the heat exchanger such as a radiator, which is required in the conventional structure. Therefore, the space efficiency can be improved, and the limited space in the upper turning body can be effectively used. This allows
Even when applied to a small construction machine where space is limited, all equipment to be mounted can be easily arranged in the upper swing body.

(2) In order to achieve the above object, the present invention also provides an engine disposed in an engine room of an upper-part turning body, a radiator for cooling a cooling water of the engine, and an operation for driving a hydraulic actuator. An oil cooler that cools oil, a cooling fan that induces cooling air to cool the engine, the radiator, and the oil cooler, and closes an outer peripheral portion of the radiator to partition the inside of the engine room into an engine side and a non-engine side. An air suction port provided on a construction machine having a sealing material and an openable / closable upper cover for covering an upper portion of the engine room, for sucking combustion air of the engine, and for purifying air introduced from the air suction port. Air cleaner, and an intake pipe for guiding air purified by the air cleaner to an engine. Suction port and the air cleaner, the engine intake system for a construction machine provided on the opposite side to the engine of the radiator and the oil cooler,
The intake pipe connects the air cleaner and the engine while penetrating the seal member disposed above the radiator.

The cooling air for cooling each device in the engine room is usually sucked in from a region of the upper cover on the side opposite to the engine of the radiator / oil cooler, cools the radiator / oil cooler and raises the temperature. Further, the engine and the like are cooled. At this time, the sealing material closes the outer periphery of the radiator and partitions the inside of the engine room into the engine side and the opposite engine side, so that the air that has passed through the radiator oil cooler and has become high temperature again has the radiator oil cooler. Prevents backflow to the non-engine side. In the present invention, by providing the intake pipe so as to penetrate the seal member, it is possible to improve the space efficiency in the upper swing body while securing the above-described backflow prevention function.

(3) In the above (2), preferably,
The seal material is divided into at least a first seal material fixed to the upper cover and in contact with an upper part of the intake pipe, and a second seal material fixed to the radiator and supporting a lower part of the intake pipe. The first and second seal members sandwich the intake pipe.

By fixing the first sealant to the openable upper cover covering the upper part of the engine room, the first sealant can be opened and closed together with the upper cover.
By opening the upper cover, the upper part of the intake pipe can be exposed, and convenience during maintenance or the like can be achieved.
Also, at the time of assembling, it is sufficient to fix the second sealant to the radiator, then install the intake pipe, fix the first sealant to the engine cover on the other hand, and finally close the engine cover. The performance is improved. At this time, the size of the first seal material in the upper cover opening / closing direction is set to be slightly larger, and the first seal material is sufficiently brought into close contact with the upper portion of the intake pipe by the pressing force when the upper cover is closed. Then, the backflow prevention function can be more reliably realized.

(4) In the above (3), more preferably, the second sealing material has a higher hardness than the first sealing material.

By increasing the hardness of the second seal member provided below the intake pipe and mainly receiving the weight of the intake pipe, the durability and reliability of the support structure of the intake pipe are improved, and the weight of the intake pipe is reduced. This prevents bending and shrinkage of the second sealing material, thereby further improving the sealing performance. Further, vibration of the intake pipe can be suppressed.

(5) In order to achieve the above object, the present invention further provides an engine disposed in an engine room of an upper-part turning body, a radiator for cooling a cooling water of the engine, and an operation for driving a hydraulic actuator. An oil cooler that cools oil, the engine, a radiator, and a cooling fan that induces cooling air to cool the oil cooler, and an openable / closable upper cover that covers an upper part of the engine room,
An air suction port provided on a construction machine having an insect repellent net provided on a side opposite to the engine of the oil cooler for sucking combustion air of the engine, and an air cleaner for purifying air introduced from the air suction port. An intake pipe for guiding air purified by the air cleaner to an engine, and wherein the air suction port and the air cleaner are provided on an engine intake side of a construction machine provided on a side opposite to the engine of the radiator and the oil cooler. In the device, the intake pipe connects the air cleaner and the engine while passing through a region above the radiator and the oil cooler, and the insect repellent net has a structure that can be divided into a plurality of pieces in the horizontal direction. I have.

The insect net provided on the side opposite to the engine of the oil cooler becomes clogged with use, and thus needs to be cleaned and replaced as appropriate. Here, in the construction machine, since the size of the radiator and the oil cooler is relatively large, the size of the insect repellent net is also relatively large. During cleaning and replacement, the insect repellent net is pulled upward after opening the upper cover. It is common to remove it and take it out from the top cover. Here, in the present invention, since the space efficiency in the upper turning body is improved by passing the intake pipe through the area above the radiator and the oil cooler, the intake pipe is disposed above the oil cooler. However, as it is, the intake pipe is obstructed and the insect repellent net cannot be pulled upward. Therefore, in response to this, the insect repellent net has a structure that can be divided into a plurality of pieces in the horizontal direction. These pieces can be easily taken out one after another without being hindered by the piping. Therefore, it is possible to improve the space efficiency in the upper revolving body while ensuring the same easy cleaning and replacement of the insect-controlling net as in the related art.

[0026]

An embodiment of the present invention will be described below with reference to the drawings. The same parts as those in FIG. 7 for describing the conventional structure are denoted by the same reference numerals, and the description will be appropriately omitted.

FIG. 2 is a diagram showing the arrangement of components in the upper swing body 101 of the small hydraulic excavator provided with the engine intake device according to the present embodiment.

In FIG. 2, the present embodiment is different from the conventional structure described with reference to FIG. 7 in that an intake pipe 118 for introducing purified air sucked from the air suction port 117A of the air cleaner 117 to the engine 4 is provided. Radiator 1
Heat exchanger 11 consisting of 16a and oil cooler 116b
6 through the upper region.

FIG. 1 is an enlarged top view (partially horizontal cross section) showing the main structure in FIG. 2 including the arrangement of the intake pipe 118.
FIG. 3 shows a side view as viewed from the direction A in FIG. In addition,
In FIGS. 1 and 3, in order to clarify the arrangement structure,
Parts other than the structure related to the engine intake device are also appropriately shown by imaginary lines (two-dot chain lines).

In FIGS. 1 and 3, a shroud 122 is fixed to the radiator 116a on the engine 4 side. The cooling fan 1 is provided in the shroud 116a.
23 (see FIG. 3), which is rotated by a driving force from a crankshaft (not shown) of the engine 4 and cools hydraulic oil for driving a hydraulic actuator.
b, a radiator 116a, a cooling wind for cooling the engine 4 and the like from below to above in FIG. 1 is induced.

The outer periphery of the radiator 116a is closed by a plurality of seal members 124 made of, for example, urethane, so that the interior of the engine room 113 is partitioned into an engine side and a non-engine side. The intake pipe 118 penetrates the plurality of seal members 124 disposed above the radiator 116a without penetrating the side wall 115 that separates the engine room 113 from the front side of the excavator (the left side in FIG. 1). 117 and the engine 4 are connected.

FIG. 4 is a front view taken in the direction of arrow B in FIG. 1 and shows a detailed structure of a portion of the intake pipe 118 which penetrates the seal member 124, which is the most significant feature of this embodiment.

Referring to FIG. 4 and FIG.
a is a radiator body 116aA, and radiator guides 116aL and 116aR provided on the left and right sides, respectively, for fixing the radiator body 116aA to a vehicle body frame 125 forming a foundation lower structure of the upper swing body 101.
And The oil cooler 116b is mounted inside the radiator guides 116aL and 116aR (see FIG. 1).

A plurality of seal members 124 are fixed to an openable and closable upper cover 126 covering the upper part of the engine room 113, and are also fixed to a seal member 124a abutting on an upper portion of the intake pipe 118 and to an upper left portion of the radiator body 116aA. Seal material 12 supporting the lower part of intake pipe 118
4b, the left radiator guide 116aL and the side wall 11
5 respectively, and seals the space between them,
Sealing material 124c that supports the side of intake pipe 118
And a seal member 124d fixed to the right radiator guide 116aR and the counter weight 12 to seal the space between them, and to a seal member 124d fixed to the upper right side of the radiator 116a. At this time, of these four sealing materials, the sealing material 124
b has a higher hardness than the others. And
When the upper cover 126 is opened, the sealing members 124a, 124b, 12
4c, the sealing members 124b and 124c on the fixed side.
And the movable side sealing material 124a are separated,
When the upper cover 126 is closed, the sealing materials 1
At 24a, 124b, and 124c, the intake pipe 118 is held as shown in FIG.

On the other hand, on the side of the oil cooler 116b opposite to the engine, the oil cooler 116b
An insect net 127 is provided for preventing insects and the like from entering the radiator 116a and clogging. The insect repelling net 127 has a plurality of (two in this embodiment) divided pieces 1 in the horizontal direction (the horizontal direction in FIG. 4).
It has a structure that can be divided into 27L and 127R. FIG.
The middle left piece 127L has a substantially rectangular frame 128L.
4 has a structure in which a wire mesh 129L is affixed therein, and a piece 127R on the right side in FIG.
The inside has a structure in which a wire net 129R is attached. At this time, as shown in FIG. 5, which is a cross-sectional view taken along the line VV in FIG. 4, the right end 128La of the frame 128L of the left piece 127L is connected to the right piece. It is configured to cover the front surface of the left end portion 128Ra of the 127R frame 128R. In addition, the right end portion 128L of the frame of the left piece 127L.
As shown in FIG. 6, which is a cross-sectional view taken along the line VI-VI in FIG. 4, a tongue 128Lao protruding rightward from the other portions is provided at the uppermost part of “a”. This tongue 128L
ao is formed with a hole into which the thumbscrew 130 is screwed, and the frame left end portion 128Ra of the right piece 127R is formed.
A hole is also formed at a position corresponding to. Both pieces 12
After butting the ends 7L and 127R such that the ends overlap each other, the thumb screws 130 are screwed in so that the two pieces 127L and 127R are fixed and united with each other.

Further, the insect-proof net 127 having the above structure is provided with two net grippers 131U, 131U provided at the upper and lower portions of the left and right radiator guides 116aL, 116aR, respectively.
L and 132U, 132L, left piece frame 128L
And the right end 128Rb of the right piece frame 128R.
At this time, the left and right upper net grippers 131U, 132U
Are formed with holes for screwing the thumb screws 133 and 134, respectively, and the left piece frame 128L and the right piece frame 128R have ears 1 with corresponding holes.
28Lc and 128Rc are formed (see FIG. 4). Then, after positioning as described above, the entire insect repelling net 127 is screwed with the thumb screws 133 and 134 so that the left and right radiator guides 116aL and 116a
aR.

In the above description, the sealing material 124a
Constitutes a first sealant fixed to the upper cover and abuts on the upper part of the intake pipe, and sealant 124b constitutes a second sealant fixed to the radiator and supporting the lower part of the intake pipe.

When the engine 4 is started in the engine room 113 of the upper revolving structure 101 arranged as described above in order to start the work by the hydraulic excavator, the combustion air is supplied to the suction port 117A provided in the air cleaner 117. And is purified by the air cleaner 117 and introduced into the intake system of the engine 4 via the intake pipe 118. The exhaust gas from the engine 4
Is guided to the muffler 19 via an exhaust pipe (not shown) and is muffled, and is released from the muffler 19 to the atmosphere via an exhaust gas pipe (not shown) protruding outside the upper cover 126. At this time, unlike the conventional structure shown in FIG. 7, the intake pipe 118 has a radiator 116a and an oil cooler 116.
The air cleaner 117 is connected to the engine 4 while passing through the upper region of FIG. Thereby, the intake pipe 1 required in the conventional structure of FIG.
8 is a useless area 21 for bypassing the radiator 16 and the like.
(See FIG. 7) becomes unnecessary, and the side wall 115 may be replaced with a straight side wall 115 instead of the substantially L-shaped side wall 15. Accordingly, by appropriately devising the arrangement of the control valve device 9, the tool box 8, the hydraulic oil tank 7, the oil tank 5, and the like, the space efficiency is improved as shown in FIG.
The limited space within 1 can be effectively used.
Therefore, all the devices to be mounted can be easily arranged in the upper revolving unit 101 of the small-sized hydraulic excavator whose space is limited.

On the other hand, in order to cool the engine 4 and each device started as described above, the driving force of the crankshaft (not shown) of the engine 4 is transmitted to the cooling fan 123 and the cooling fan 123 is rotated. Let it. As a result, cooling air is sucked from an intake hole (not shown) provided on the side of the upper cover 126 opposite to the engine, and is cooled through the oil cooler 116b and the radiator 116a. Thereafter, the cooling air is sucked into the cooling fan 123 through the shroud 122, and is further blown out from the cooling fan 123 to cool the engine 4 and the hydraulic pump 6 and the like. (Not shown). At this time, the radiator 11
The seal members 124a to 124d provided on the outer peripheral portion of the oil cooler 116b and the radiator 1b partition the interior of the engine room 113 into an engine side and a non-engine side.
The function of preventing the high-temperature air passing through 16a from flowing back to the oil cooler 116b and the radiator 116a on the side opposite to the engine. here,
In the present embodiment, when the intake pipe 118 is passed through the upper area of the radiator 116a and the oil cooler 116b as described above, the suction pipe 118 is provided so as to penetrate the sealant 114, thereby preventing the backflow of the sealant 114. The function can be prevented from being hindered. At this time, the size of the sealing material 124a in the opening and closing direction of the upper cover 126 (that is, the vertical direction) is set to be slightly larger, and when the upper cover 126 is closed, the sealing material 124a is sufficiently placed above the intake pipe 118 by pressing force. The close contact prevention function can be more reliably realized by making the close contact. Furthermore, by increasing the hardness of the seal member 124b provided below the intake pipe 118 and mainly receiving the weight of the intake pipe 118, the durability and reliability of the support structure of the intake pipe 118 are improved, and the intake pipe 1
The flexure / shrinkage of the sealing material 124b due to its own weight of 18 can be prevented, and the sealing performance can be further improved. Further, there is an effect that vibration of the intake pipe 118 can be suppressed. Further, sealing materials 124a, 124b, 1 around the intake pipe 118
When assembling the 24c, the side wall 115 and the radiator guide 1
After fixing the sealing material 124c to the radiator body 116aA and the sealing material 124b to the radiator body 116aA,
The intake pipe 118 is installed, while the engine cover 1
It is sufficient to fix the sealant 124a to the seal 26 and finally close the engine cover 126. At this time, it is easy to assemble the intake pipe 118 by preventing the sealant 124b from bending or contracting due to the weight of the intake pipe 118. There is also an effect that can be done.

By the way, while the hydraulic excavator is working as described above, the cooling is always performed by the cooling air, but the insect repelling net 12 provided on the opposite side of the engine of the oil cooler 116b.
In the case of No. 7, foreign substances such as insects and garbage are caught with use and clogging occurs. Therefore, it is necessary to appropriately perform cleaning and replacement.

Here, in construction machines such as hydraulic excavators,
Since the size of the radiator and oil cooler is relatively large, the size of the insect repellent net is also relatively large.When cleaning or replacing it, remove the insect repellent net by pulling it up after opening the upper cover and removing it from the upper cover. It is common to take it out.

However, in the present embodiment, the space efficiency in the upper revolving unit 101 is improved by passing the intake pipe 118 through the area above the radiator 116a and the oil cooler 116b as described above. An intake pipe 118 is provided above 116b, and the intake pipe 118 does not allow the insect net 127 to be pulled upward as it is. Therefore, in response to this, in the present embodiment, the insect-proof net 127 is horizontally divided into two pieces 127L, 127R.
The structure can be divided into two. Thus, at the time of cleaning / replacement, by removing the thumbscrew 130 and dividing the insect-proof net 127 into pieces 127L and 127R, the suction pipe 1
18 without being interrupted by these pieces 127
L, 127R can be easily taken out upward. In this manner, like the general hydraulic excavator, the insect-proof net 127 can be removed so as to be pulled upward during cleaning and replacement, and can be taken out from the upper cover 126.
That is, it is possible to secure easy cleaning and replacement of the insect-proof net 127 as in the related art.

In the above embodiment, the sealing material 124 is replaced by the sealing materials 124a, 124b, 124c, 1
Although the structure is divided into four of 24d, the present invention is not limited to this. For example, the sealant 124c may be integrally formed of the same material as the sealant 124b. In short, the upper cover 12
It is sufficient that the seal material fixed to the upper surface 6 and abutting on the upper portion of the intake pipe 118 and the seal material fixed to the radiator main body 116aA and supporting the lower portion of the intake pipe 118 are at least divided.

In the above embodiment, all the seal members 124a to 124d are made of urethane. However, the present invention is not limited to this. For example, rubber may be used. Only the sealing material 124b having high hardness is made of rubber, and the remaining sealing material
4a, 124c and 124d may be urethane.

[0045]

According to the present invention, since the intake pipe connects the cleaner and the engine while passing through the area above the radiator and the oil cooler, there is no useless space for the intake pipe to bypass the radiator and the like. It becomes unnecessary. Therefore, space efficiency can be improved.

[Brief description of the drawings]

FIG. 1 is a top view illustrating a main structure including an arrangement of an intake pipe of an engine intake device according to an embodiment of the present invention.

FIG. 2 is a device layout diagram of an upper revolving body of a small hydraulic shovel provided with an engine intake device according to an embodiment of the present invention.

FIG. 3 is a side view as viewed in the direction of arrow A in FIG.

FIG. 4 is a front view as viewed in the direction of arrow B in FIG. 1;

FIG. 5 is a sectional view taken along a line VV in FIG. 4;

FIG. 6 is a sectional view taken along the line VI-VI in FIG. 4;

FIG. 7 is a diagram showing an example of a conventional upper revolving internal device arrangement.

[Explanation of symbols]

 4 Engine 101 Upper Revolving Structure 113 Engine Room 116a Radiator 116b Oil Cooler 117 Air Cleaner 117A Air Suction Port 118 Intake Piping 123 Cooling Fan 124a Sealing Material (First Sealing Material) 124b Sealing Material (Second Sealing Material) 124c, d Sealing Material 126 Upper cover 127 Insect-proof net

Claims (5)

[Claims] An engine disposed in an engine room of an upper-part turning body, a radiator for cooling a cooling water of the engine, an oil cooler for cooling hydraulic oil for driving a hydraulic actuator, the engine, the radiator, and An air suction port provided on a construction machine having a cooling fan for inducing a cooling wind for cooling an oil cooler, for sucking combustion air of the engine, and an air cleaner for purifying air introduced from the air suction port, An intake pipe for guiding air purified by the air cleaner to an engine, and wherein the air suction port and the air cleaner are provided on a side opposite to the engine of the radiator and the oil cooler. In the above, the intake pipe passes through a region above the radiator and the oil cooler. An air intake device for a construction machine, wherein the air cleaner is connected to the engine. 2. An engine disposed in an engine room of an upper revolving structure, a radiator for cooling water of the engine, an oil cooler for cooling hydraulic oil for driving a hydraulic actuator, the engine, the radiator, and A cooling fan that induces cooling air for cooling the oil cooler, a seal member that closes an outer peripheral portion of the radiator to partition the inside of the engine room into an engine side and a non-engine side, and that can be opened and closed to cover an upper part of the engine room. An air suction port provided on a construction machine having an upper cover and for sucking combustion air of the engine, an air cleaner for purifying air introduced from the air suction port, and an air cleaned by the air cleaner for the engine. And the air suction port and the air cleaner are connected to the radiator. In the engine intake device for a construction machine provided on the side opposite to the engine of the air cooler and the oil cooler, the intake pipe connects the air cleaner and the engine while penetrating the seal member disposed above the radiator. An engine intake device for a construction machine, characterized in that: 3. The engine intake device for a construction machine according to claim 2, wherein the seal member is fixed to at least a first seal member fixed to the upper cover and in contact with an upper portion of the intake pipe, and fixed to the radiator. And a second seal member for supporting a lower portion of the intake pipe.
An engine intake device for a construction machine, characterized in that the intake pipe is sandwiched between the seal member and the second seal member. 4. The engine intake device for a construction machine according to claim 3, wherein the second seal member has a higher hardness than the first seal member. . 5. An engine disposed in an engine room of an upper revolving unit, a radiator for cooling a cooling water of the engine, an oil cooler for cooling hydraulic oil for driving a hydraulic actuator, the engine, the radiator, and A cooling fan that induces cooling air for cooling an oil cooler, an openable and closable upper cover that covers an upper part of the engine room, and a insect net provided on an anti-engine side of the oil cooler are provided on a construction machine. An air suction port for sucking combustion air of the engine, and an air cleaner for purifying air introduced from the air suction port,
An intake pipe for guiding air purified by the air cleaner to an engine, and wherein the air suction port and the air cleaner are provided on a side opposite to the engine of the radiator and the oil cooler. In the above, the intake pipe connects the air cleaner and the engine while passing through a region above the radiator and the oil cooler, and the insect net has a structure that can be divided into a plurality of pieces in a horizontal direction. An engine intake device for a construction machine.