JP3236792B2 - Work machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a working machine suitably used for a construction machine such as a hydraulic shovel or the like, and more particularly to a machine housing for housing a hydraulic machine or the like in a frame located below a driver's seat. The present invention relates to a working machine provided with a room.

[0002]

2. Description of the Related Art Among hydraulic excavators, as a small hydraulic excavator, for example, as disclosed in Japanese Patent Application Laid-Open No. 4-1412, a frame, a driver's seat arranged on the frame, and a hydraulic device in the frame. A device accommodation room provided below the driver's seat to accommodate the engine, an engine room provided behind the driver's seat, an engine, a cooling fan, A device having a radiator is known.

[0003] Such a conventional hydraulic excavator is composed of a lower traveling structure and an upper revolving structure mounted on the lower traveling structure so as to be pivotable, and a revolving frame of the upper revolving structure includes a driver's seat and an engine. A room and an equipment accommodation room are provided, and a working device for performing an excavation operation or the like is attached to the front side of the revolving frame so as to be able to move up and down.

[0004] In the engine compartment, the engine is disposed in the left-right direction, and the radiator is provided on one side in the left-right direction with respect to the engine. In the engine room, a hydraulic pump driven by the engine is provided. On the other hand, inside the equipment housing room, there are a swing motor for swinging the upper swing body, a control valve for supplying and discharging pressure oil discharged from the hydraulic pump to the swing motor, a hydraulic actuator for a working device, and the like. Hydraulic equipment is housed.

[0005] Here, in a small-sized hydraulic excavator used for excavation work or the like at a narrow work site, it is required that the accommodation space of the engine room is reduced as much as possible to reduce the turning radius of the upper turning body. For this reason, in the prior art,
The equipment room is provided in the turning frame below the driver's seat, and hydraulic equipment such as control valves, which should normally be installed in the engine room, is installed in this equipment room. I have.

[0006] The engine cover which defines the engine compartment has an intake port located on one side in the left-right direction of the engine for allowing cooling air to flow in order to cool the interior of the engine compartment and the equipment accommodating compartment. An exhaust port is provided at the other side for letting out cooling air. The partition wall that blocks between the engine room and the equipment storage room is provided with an air vent that communicates between them on one side in the left-right direction of the engine. It is formed at a position downstream of the radiator. Further, another exhaust port is provided on the front side of the equipment housing chamber to exhaust a part of the cooling air flowing into the equipment housing chamber from the engine chamber via the ventilation hole to the outside.

During operation of the engine, by operating a cooling fan, outside air flows in as cooling air from an intake port of the engine room, and the cooling air flows around the engine in the left-right direction after cooling the radiator. Then, it flows out from the opposite exhaust port. In addition, a part of the cooling air that has cooled the radiator flows into the equipment housing room through the ventilation port, and flows out from the exhaust port to the outside. As a result, the interior of the engine room or the equipment housing room, which is likely to be heated to a high temperature by heat released from the engine, the radiator, the control valve (hydraulic oil), and the like, is cooled.

[0008]

In the above-mentioned prior art, the radiator is cooled by the cooling air flowing from the intake port of the engine room, and then the cooling air is exhausted from the exhaust port on the opposite side of the engine from the radiator. And a part of the cooling air that has cooled the radiator is allowed to flow through the vent hole into the equipment housing room to cool the inside.

For this reason, not only does the cooling air heated by cooling the radiator flow into the engine room, but also flows into the equipment housing room through the ventilation port. As a result, especially in summer when the outside temperature is high, the inside of the engine room and the equipment housing room tends to become hot during operation of the hydraulic shovel, and other equipment housed therein is adversely affected. is there.

[0010] Since the engine room and the equipment accommodating room are located below and behind the driver's seat, during operation of the hydraulic excavator, the feet and the back of the driver's seat become relatively high in temperature, and the driver's seat becomes hot. And the like, which may cause discomfort, and the operating environment of the hydraulic shovel is deteriorated.

The present invention has been made in view of the above-mentioned problems of the prior art, and the present invention can efficiently cool the interior of an engine room and an equipment accommodating room, can surely suppress the temperature of these components from becoming high, and operate the engine room. It is an object of the present invention to provide a working machine capable of greatly improving the environment.

[0012]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a frame having a framed structure, a driver's seat disposed on the frame, and a hydraulic device accommodated in the frame. A device accommodation room provided below the driver's seat and an engine cover provided behind the driver's seat are defined by an engine cover, and are separated from the device accommodation room in the front-rear direction by a partition wall. an engine compartment with an engine which is disposed toward the lateral direction to the engine compartment, is applied to a working machine and a radiator that is cooled by the cooling fan provided on the other side in the lateral direction of the engine.

[0013] The feature of the configuration invention of claim 1 is employed, the intake port for introducing cooling air is provided on the front surface of the unit container, the said partition wall on one side in the lateral direction of the engine And a ventilation port for communicating between the equipment housing room and the engine room is provided in the engine room.
It is located along the rear side of the transfer seat and
An intake duct for introducing cooling air into the engine compartment is provided, and the engine cover is provided on the other side in the left-right direction of the engine.
Position to in the provision of the air outlet to flow out of the cooling air introduced into the engine compartment from the introduced cooling air to the vent from the intake duct after passing through the radiator.

With this configuration, the cooling air that has flowed into the equipment housing room from the air inlet can be circulated from the ventilation hole of the partition wall into the engine room. This cooling air allows the cooling air to flow between the equipment housing room and the engine room. Can be cooled. In the engine room, the ventilation holes are provided on the side opposite to the radiator with respect to the left-right direction of the engine, so that the radiator can be disposed downstream of the flow of the cooling air in the engine room. Thus, the cooling air whose temperature has risen can flow out of the exhaust port to the outside without staying in the engine room.

[0015] Also, the cooling air flowing through the intake duct, can shield the heat of the engine compartment relative to the site of the engine cover along the back side of the driver's seat, it is possible to suppress the temperature rise of the engine cover at this site. In addition to the cooling air flowing from the equipment housing room, the cooling air can be directly introduced into the engine room by the intake duct, and the radiator and the like in the engine room can be cooled by the cooling air having a relatively large flow rate.

Further, in the invention according to claim 2 , the intake duct is configured as an air passage divided by a front surface of the engine cover and a duct cover provided on the rear side thereof.

Thus, the wall surface of the intake duct can be constituted by the front surface of the engine cover along the rear side of the driver's seat, and the engine cover at this portion can be directly cooled by the cooling air flowing through the intake duct.

Further, according to the third aspect of the present invention, the intake pipe of the engine is provided to be open in the intake duct.

Thus, it is possible to cause the engine to take in the outside air having a lower temperature than that of the engine room flowing in the intake duct, to maintain the intake temperature of the engine at a low temperature, and to improve the operation efficiency.

[0020]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

[0021] Here, FIGS. 1 to 5 show a real <br/>施例that by the present invention, in the present embodiment will be described with an example of the small hydraulic shovel as a work machine.

Reference numeral 1 denotes a lower traveling body, 2 denotes an upper revolving body mounted on the lower traveling body 1 so as to be revolvable, and the upper revolving body 2 comprises a revolving frame 3 as a frame forming a frame structure; The driver's seat 4 arranged on the front side on the revolving frame 3, a device accommodation room 14 and an engine room 21 which will be described later.
And a counterweight 5 located on the rear side of the turning frame 3. On the front side of the revolving frame 3, a working device 32 to be described later is mounted so as to be able to move up and down and swing in the left-right direction.

Here, the turning frame 3 is shown in FIGS.
As shown in the figure, the bottom plate 6 constituting the lower surface of the revolving frame 3
And a pair of vertical plates 7 and 7 vertically fixed on the bottom plate 6.

The vertical plates 7 are arranged at intervals in the left-right direction of the revolving frame 3 and extend in the front-rear direction. Each of the vertical plates 7 is bent in a substantially “C” shape so that the front portions thereof approach each other, and their distal ends are formed in a substantially V shape and protrude more toward the front than the bottom plate 6. Further, each vertical plate 7 has openings 7A, 7A formed on the front end side and cutouts 7B, 7B formed on the rear side.

A working device 3 is provided at the tip end of each vertical plate 7.
A bracket mounting portion 8 for mounting the second rotation bracket 33 is provided, and a cylinder mounting portion 9 for mounting the horizontal rotation cylinder 33A of the working device 32 is provided at an intermediate portion of one of the vertical plates 7. I have.

Further, an upper plate 10 is attached to the upper side surface of each vertical plate 7, and a floor plate 11 of the driver's seat 4 is fixed to the upper plate 10. A front plate 12 and left and right side plates 13, 13 are vertically mounted on the outer edge side of the bottom plate 6 between the bottom plate 6 and the floor plate 11. The front plate 12 has an insertion hole 12A for inserting the horizontal rotation cylinder 33A at a position outside the vertical plate 7 in the left-right direction.

Reference numeral 14 denotes an equipment storage room provided in the turning frame 3 under the driver's seat 4.
As shown in FIGS. 3 and 4, the bottom plate 6, the upper plate 10, the floor plate 11, the front plate 12, the respective side plates 13 and a partition wall 19 to be described later.
Is defined by Then, in the unit container 14, a swing motor 15 for swinging an upper swing structure 2 on the lower traveling body 1, the work orbiting motor 15 and below the hydraulic fluid delivered from said hydraulic pump unit 32 A hydraulic device including a control valve 16 for supplying / discharging the cylinders 33A, 34A, 35A, 36A and the like is accommodated.

Reference numerals 17 and 17 denote tail frames (only one is shown) for supporting the counterweight 5, the engine 22 and the like. As shown in FIG.
The front portion is made of a pair of steel plates and the like attached to the rear portion of each vertical plate 7 with the partition wall 19 interposed therebetween, and is disposed at intervals in the left and right directions while extending in the front-rear direction. Each tail frame 17 and the partition wall 19 form a part of the turning frame 3. 18 is each tail frame 1
7 is an undercover provided on the lower surface side of FIG.

Reference numeral 19 denotes a partition wall provided between the equipment accommodating room 14 and the engine room 21. The partition wall 19 projects upward from the rear end side of the bottom plate 6 as shown in FIGS. Both right ends are attached to each side plate 13. The partition wall 19 has its upper end fixed to the floor plate 11 of the driver's seat 4 and a front surface portion 20B of an engine cover 20, which will be described later, thereby shutting off the space between the engine room 21 and the equipment housing room 14.

Reference numeral 20 denotes an engine cover which is located on the rear side of the driver's seat 4 and is mounted on the revolving frame 3. The engine cover 20 has an upper surface 20 as shown in FIGS.
A, the front part 20B, the rear part 20C, and the left and right side parts 20D, 20D, etc. are formed in a substantially box shape. The rear surface portion 20C is mounted on the upper surface side of the counterweight 5, and each side surface portion 20D is mounted on both the left and right sides of the under cover 18.

An engine room 21 is provided on the turning frame 3 at a position rearward of the driver's seat 4. The engine room 21 is provided with an under cover 1 as shown in FIGS.
8, an engine 22, a hydraulic pump (not shown) driven by the engine 22, and a radiator 24 and the like described later are accommodated therein. I have.

Reference numeral 22 denotes an engine located in the engine room 21 and arranged in the left-right direction of each tail frame 17. The engine 22 has a cooling fan 2 on the right side in the left-right direction.
3, and an intake pipe 30, which will be described later, is attached to the left side as shown in FIG .

Reference numeral 24 denotes a radiator for cooling the engine 22. The radiator 24 is located on the right side in the left-right direction of the engine 22 and has a cooling fan 23 and an engine cover 20.
And is cooled by a cooling fan 23 during operation of the engine 22.

Numeral 25 is an air inlet provided at the front side of the equipment accommodating chamber 14 for introducing cooling air.
As shown in FIG. 4, the front plate 12 is formed between the vertical plates 7 of the revolving frame 3, and communicates between the inside and the outside of the device accommodating chamber 14 through the opening 7 </ b> A of each vertical plate 7. I have.

Reference numeral 26 denotes a vent formed in the partition wall 19, which is disposed at a position on the left side of the engine 22 in the left-right direction with respect to the engine 22.
4 is communicated.

Reference numeral 27 denotes intake air provided in the engine room 21.
The intake duct 27 is a duct cover having an L-shaped cross section.
The duct cover 28 has engine ends at both ends.
Attached to the upper surface portion 20A and the front portion 20B of the Lanka bars 20
Have been killed. Then, the duct cover 28, engine
The front portion 20B of the engine cover 20 is located in the chamber 21.
The intake duct 27 is defined between the intake duct 27 and the like.
Extends in the left-right direction along the back side of the driver's seat 4.

The inflow side of the duct cover 28 is shown in FIG.
As shown in FIG.
Attached to the side surface 20D , corresponding to the intake duct 27
A duct intake port 29 is provided at a position where the duct is to be operated . Ma
The outlet side of the intake duct 27 corresponds to the cooling fan 23
At the position of the engine compartment 21. further,
In the intake duct 27, an intake pipe 30 of the engine 22 Hurghada
It is open through the cover 28 .

Reference numeral 31 denotes a side surface portion 20D of the engine cover 20.
The exhaust port 31 is provided in the engine room 21.
The cooling air passing through the radiator 24 is formed at a position corresponding to the radiator 24 in the inside, and flows out of the engine room 21.

Reference numeral 32 denotes a working device mounted on the front side of the revolving frame 3. The working device 32 is mounted on the bracket mounting portion 8 (see FIG. 3) of the revolving frame 3 in the left-right direction as shown in FIGS. Bracket 33 which is rotatably attached to the rotating bracket 33 and is rotated by a horizontal rotating cylinder 33A.
A boom 34 attached to the rotating bracket 33 so as to be able to move up and down, and an arm 3 that is moved up and down together with the boom 34
5 and bucket 36, the boom 34, the arm 35
And cylinders 34A, 3 for operating buckets 36 and the like
5A, 36A, etc.

The working device 32 is swung in the left-right direction from the front of the upper revolving unit 2 by turning the turning bracket 33 in the left-right direction by the horizontal turning cylinder 33A. By operating 35A and 36A, the upper revolving unit 2 is vertically rotated (elevated) at these positions.

The small-slewing hydraulic excavator according to the present embodiment has the above-described configuration, and its operation will be described below.

First, during operation of the hydraulic shovel, the hydraulic pump is driven by the engine 22 and the hydraulic oil discharged from the hydraulic pump is supplied to the swing motor 15 and the cylinders 33A, 3 of the working device 32 via the control valve 16 and the like.
By supplying / discharging to / from the 4A, 35A, 36A and the like, the upper swing body 2 is swung, and the work device 32 is operated to perform excavation work such as earth and sand.

When the engine 22 is operating, the cooling fan 23 is driven by the engine 22. The cooling fan 23 blows air in the direction of arrow A in FIG. The gas is forcibly discharged from the port 31 to the outside of the engine room 21. As a result, the outside air flows into the device housing chamber 1 inside the engine chamber 21 that tends to have a negative pressure.
4, and flows as follows.

That is, outside air is introduced into the equipment accommodating chamber 14 from the air inlet 25 of the front plate 12 and the insertion hole 12A as cooling air as shown in FIG.
The cooling air flows as shown by arrows B1 and B2 shown in FIG.
And hydraulic equipment such as the control valve 16 are cooled.

The cooling air flows into the engine room 21 through the ventilation port 26 of the partition wall 19 as shown by arrow C to cool the inside thereof, and is then guided to the cooling fan 23 as shown by arrow D. The cooling air that passes through the radiator 24 and cools the radiator 24 at this time, and whose temperature has risen, is discharged from the exhaust port 31 to the outside of the engine room 21 by the cooling fan 23 as indicated by arrow A.

In the engine room 21, the back of the driver's seat 4 is located.
Since the intake duct 27 is provided along the surface side,
The cooling air is blown by the air duct 27 as shown by arrow E in FIG.
From the duct inlet 43 to the front of the engine cover 20.
It flows into the engine room 21 along the part 20B . this
As a result, the cooling air flowing through the intake duct 27
With respect to the front portion 20B of the cover 20,
Heat can be shut off, and the front part 20B can be directly cooled by cooling air.
In front of the driver's seat 4 along the back side
It is possible to reliably suppress the temperature of the surface portion 20B from rising.
it can.

Thus, in this embodiment, the device accommodation room 14
An intake port 25 is provided at the front side of the engine compartment 21 and a partition wall 19 that shields the engine room 21 and the equipment accommodating room 14 is provided with an engine 22.
Luck to the ventilation openings 26 is provided on the position where the radiator 24 and the opposite side with respect to the horizontal direction, the engine compartment 21
An intake duct 27 is provided along the rear side of the transfer seat 4, and the exhaust cover 3 is located on the engine cover 20 on the radiator 24 side.
Since the configuration in which the 1, can be reliably introduced from the intake port 25 into the equipment storage chamber 14 relatively cool outside air as cooling air.

This cooling air can be smoothly circulated from the equipment accommodating chamber 14 into the engine room 21 through the ventilation port 26, and the cooling air accommodates the turning motor 15, the control valve 16, and the like. It is possible to efficiently cool the inside of the device accommodation room 14 and the inside of the engine room 21 in which the engine 22 and the radiator 24 are accommodated.

Further, since the radiator 24 can be disposed downstream of the flow of the cooling air in the engine room 21, the cooling air whose temperature has risen by cooling the radiator 24 is discharged from the exhaust port 31 to the outside by the cooling fan 23. Can be discharged quickly. Thereby, it is possible to reliably prevent the cooling air whose temperature has risen from flowing around the engine 22 and the like, and to prevent the cooling efficiency in the engine room 21 from being lowered.
Can be stably suppressed from increasing in temperature in the engine room 21 as compared with a case in which is disposed upstream of the engine 22.

In the present embodiment, in particular,
Configuration in which intake duct 27 is provided along the back side of driver's seat 4
So that the engine room 21 can be cooled more efficiently.
The temperature on the back side of the driver's seat 4 can be greatly reduced
it can.

That is, the cooling air is drawn by the intake duct 27 as shown in FIG.
As shown by arrow E in FIG.
The engine compartment 21 extends along the front surface 20B of the gin cover 20.
Flows into the interior. Therefore, the cooling air flowing through the intake duct 27
The wind blows against the front portion 20B of the engine cover 20.
The heat inside the engine room 21 can be shut off, and
It can be cooled directly by the cooling air and
Ensure that the temperature of the front part 20B along the back side rises
Can be suppressed.

Therefore, according to the present embodiment, during the operation of the hydraulic excavator, the heat released from the engine 22 and the control valve 16 and the like causes the engine room 21 and the equipment accommodation room 14
It is possible to prevent the temperature inside the vehicle from increasing greatly, and to prevent the equipment and the like housed therein from being adversely affected by the temperature increase, and the lower side and the rear side of the driver's seat 4 from becoming hot. It is possible to prevent the failure reliably, and to greatly improve the operating environment of the excavator.

Further, since the air inlet 25 is provided between the vertical plates 7 of the revolving frame 3 and is provided on the front plate 12, the cooling air flowing from the air inlet 25 into the equipment accommodating chamber 14 is formed as shown in FIG.
As indicated by an arrow B1 in the drawing, the fluid can be smoothly guided to hydraulic devices such as the swing motor 15 and the control valve 16 disposed between the vertical plates 7, and the cooling efficiency for these hydraulic devices is greatly reduced. Can be enhanced.

Further, since the cooling air can be introduced into the equipment accommodating chamber 14 by using the insertion hole 12A of the front plate 12 provided for the horizontal rotation cylinder 33A of the working device 32,
Cooling air flowing into the equipment accommodating chamber 14 from the insertion hole 12A can be circulated outside each vertical plate 7 as shown by an arrow B2 in FIG. Without making any changes, the entire device accommodating chamber 14 can be efficiently cooled using the insertion holes 12A.

[0055] Also, apart from the cooling air flowing from the unit container 14, an engine compartment cooling air by the intake duct 27 2
1 into the engine compartment 21
Since the flow rate of the cooling air flowing through the inside can be surely increased, the cooling efficiency of the radiator 24 and the like can be greatly improved.

Further, since the intake pipe 30 of the engine 22 is opened in the intake duct 27, the outside air having a lower temperature than in the engine room 21 can be directly taken into the engine 22 through the intake duct 27. The intake air temperature of the intake air 22 can be stably maintained at a low temperature, and the operation efficiency thereof can be reliably increased.

[0057] In the front you施例, although the intake duct 27 is constituted by an engine cover 20 or the like, the present invention is not limited to this, the front of the duct member and the like which is prepared separately from the engine cover 20 of the engine cover 20 It may be configured to be disposed in the engine room 21 on the side of the part 20B.

[0058] In the front you施例, a configuration which opens the intake pipe 30 of the engine 22 into the intake duct 27, the present invention is not limited to this, the intake pipe 30 to the intake duct 2
It is also possible to adopt a configuration in which it is opened inside the engine room 21 outside the outside 7.

Further, in each of the above embodiments, a small hydraulic excavator has been described as an example of a working machine. However, the present invention is not limited to this, and for example, construction of ordinary medium or large hydraulic excavator, hydraulic crane, etc. Machinery, even industrial,
The present invention may be applied to an agricultural work machine or the like.

[0060]

As described in detail above, according to the first aspect of the present invention, an air intake port is provided in the equipment accommodating room, and a partition wall between the equipment accommodating room and the engine room is provided in the left-right direction of the engine. A vent is provided on the opposite side of the radiator, and an intake duct is installed in the engine room along the rear side of the driver's seat.
The door is provided, the engine cover from was configured to provide an exhaust port for discharging the cooling air which has passed through the radiator to the outside, Ru can efficiently cool the equipment accommodating chamber and the engine compartment relatively low temperature of the outside air as cooling air On top of the equipment accommodation room
In addition to the cooling air flowing in from the
Can be directly introduced into the engine compartment, and the temperature rise in the engine compartment can be stably suppressed as compared with , for example , a case where the radiator is disposed upstream of the engine.

Therefore, it is possible to prevent the temperature in the engine room and the equipment housing room from rising significantly during the operation of the working machine,
It is possible to reliably prevent the lower side and the rear side of the driver's seat from becoming hot, and to significantly improve the operating environment of the working machine.

The cooling air flowing from the equipment housing room is
Separately, cooling air is drawn directly into the engine room by the intake duct.
Since can be introduced, the site of the engine cover along the back side of the driver's seat by the cooling air in the intake duct can be reliably prevented from rising temperature, within the engine compartment by a relatively flow large cooling air The radiator and the like can be efficiently cooled, and the temperature in the engine room and the equipment housing room can be reliably prevented from greatly increasing during operation of the work machine.

According to the second aspect of the present invention, the intake duct is constituted by the front surface of the engine cover and the duct cover provided on the rear side thereof, so that the engine cover extends along the rear surface of the driver's seat. The front surface can be directly cooled by the cooling air in the intake duct, and the temperature on the rear side of the cab can be reliably prevented from rising.

Further, according to the third aspect of the present invention,
Since the intake pipe of the engine is designed to open in the intake duct, it is possible to draw outside air, which is cooler than the engine compartment, directly into the engine via the intake duct, and stabilize the engine intake temperature to a low temperature. In addition to maintaining the operation efficiency, the operation efficiency can be reliably increased.

[Brief description of the drawings]

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

FIG. 2 is a plan view of FIG. 1 showing a hydraulic excavator.

FIG. 3 is a longitudinal sectional view showing an upper swing body of the hydraulic shovel.

FIG. 4 is a cross-sectional view as viewed from the direction of arrows IV-IV in FIG. 3;

FIG. 5 is a transverse sectional view as seen from the direction of arrows IV-IV in FIG . 3 ;

[Explanation of symbols]

3 Swivel Frame (Frame) 4 Driver's Seat 14 Equipment Storage Room 15 Swivel Motor (Hydraulic Equipment) 16 Control Valve (Hydraulic Equipment) 19 Partition Wall 20 Engine Cover 21 Engine Room 22 Engine 23 Cooling Fan 24 Radiator 25 Inlet 26 Inlet 26 Vent 27 Intake duct 28 duct cover 30 intake pipe 31 exhaust port

Continuing on the front page (72) Inventor Eiji Minamiyama 650, Kandachi-cho, Tsuchiura-shi, Ibaraki Hitachi Construction Machinery Co., Ltd. References JP-A-4-1412 (JP, A) JP-A-3-68522 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F01P 5/06 510-511 B60K 11 / 04

Claims (3)

(57) [Claims] 1. A frame having a frame structure, a driver's seat disposed on the frame, and a device accommodation room provided below the driver's seat to accommodate hydraulic equipment in the frame. An engine room that is provided on the rear side of the driver's seat and is defined by an engine cover, and is separated from the device housing room in the front-rear direction by a partition wall, and is disposed in the engine room in the left-right direction. an engine, a working machine that includes a radiator which is cooled by a cooling fan provided on the other side in the lateral direction of the engine, an inlet for introducing the cooling air is provided on a front surface of the unit container, the partition the walls provide a vent communicating between said unit container and an engine compartment located in one side in the lateral direction of the engine, the said engine compartment along the back side of the driver's seat Is arranged an intake duct for introducing cooling air into the engine compartment provided from one side in the lateral direction, is the engine cover has been introduced from <br/> the intake duct is located on the other side in the lateral direction of the engine A work machine provided with an exhaust port through which cooling air and cooling air introduced into the engine room from the ventilation port flow out of the radiator after passing through the radiator. 2. The work machine according to claim 1 , wherein the intake duct is configured as an air passage divided by a duct cover provided on a front side and a rear side of the engine cover. Wherein the intake pipe of the engine, the working machine according to claim 1 or 2 formed by providing an opening in said air intake duct.