JPH10168942A - Swivel work machine - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To prevent a rise in room temperature in an operator's cab by discharging hot air generated in a device accommodation space formed below a floor plate of the operator's cab to the outside. SOLUTION: A bottom plate 7A of a turning frame 7 and a cab 13 are provided.
The device housing space 19 is formed between the floor cover 14 and the side cover 21 surrounding the device housing space 19.
3 and an exhaust fan 24 is provided near the communication port 23. Thereby, when hot air is generated in the device housing space 19 due to heat generation of the control valve 20, the exhaust fan 24 causes the device housing space 1
By forcibly sucking out the hot air in the device 9 through the communication port 23, it is possible to prevent the room temperature in the cab 13 from rising due to the hot air in the device housing space 19.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a swing type working machine such as a hydraulic shovel, a hydraulic crane, etc., which works while swinging an upper swing body.

[0002]

2. Description of the Related Art Generally, a hydraulic excavator suitably used for excavation work at a construction site and the like includes a lower traveling body and an upper revolving body rotatably mounted on the lower traveling body. A turning frame, a machine room provided on the rear side of the turning frame, a driver's cab located on the turning frame located on the front side of the machine room, and a vertically movable unit on the front side of the turning frame. And a working device provided.

A control valve for supplying and discharging an engine, a hydraulic pump driven by the engine, hydraulic oil discharged from the hydraulic pump to a swing motor, a hydraulic actuator for driving a working device, and the like is provided in the machine room. Etc. are accommodated. In the cab, usually, a driver's seat for an operator to sit down, an operation lever for operating a working device, and the like are provided.

[0004] In the case of a small turning type excavator used for excavation work at a narrow work site or the like, the turning radius of the upper turning body that turns with the working device is reduced, so that the space in the machine room is reduced. It is required to be as small as possible.

[0005] For this reason, in the small turning type hydraulic excavator,
Normally, a device housing space is formed in the swivel frame located below the floor plate of the driver's cab, a hydraulic device such as a control valve is housed in the device housing space, and protection for covering the device housing space from the periphery of the swivel frame. The cover is provided.

[0006]

However, in the small swing type excavator according to the prior art described above, the following problems occur when the control valve is provided below the floor plate of the cab.

That is, since the control valve generates heat by constantly supplying and discharging the high-pressure oil discharged from the hydraulic pump, the floor plate of the cab is heated by the heat from the control valve and the room temperature in the cab is increased. Raises the occupancy and greatly reduces the livability.

Further, since the floor panel of the cab is provided with an insertion hole through which electric wiring, control cables, and the like are inserted, hot air in the equipment housing space is directly introduced into the cab through the insertion hole, and Room temperature will rise.

Further, since the hydraulic pump attached to the engine is connected to the control valve by hydraulic piping, the machine room and the equipment housing space are partially in communication. For this reason, the cooling air sucked into the machine room by the fan of the
There is a problem that the heated cooling air enters the cab through the equipment accommodating space, and the room temperature in the cab further rises.

As described above, when the temperature in the driver's cab rises and the temperature in the equipment housing space below the floorboard of the driver's cab becomes high, the feet of the driver's seat become hot and the driving work efficiency is impaired. In particular, a working machine without an air conditioner, such as a small turning hydraulic excavator, has a disadvantage that workability in summer is significantly reduced.

The present invention has been made in view of the above-described problems of the prior art, and even when equipment capable of generating heat is accommodated in an equipment accommodating space formed below the floor plate of the cab, the room temperature in the cab rises. It is an object of the present invention to provide a swivel-type working machine capable of preventing the turning.

[0012]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention comprises a lower traveling body and an upper revolving body which is mounted on the lower traveling body so as to be pivotable, wherein the upper revolving body is provided. A turning frame, a machine room provided on the rear side of the turning frame and containing the engine therein, and a driver's cab provided on the turning frame at a front side of the machine room,
A device accommodation space formed between the lower side of the floor plate of the cab and the turning frame, and accommodating a device capable of generating heat therein;
The present invention is applied to a revolving work machine comprising a protective cover for covering the device accommodating space from around the revolving frame.

[0013] A feature of the structure adopted by the invention of claim 1 is that the protective cover is provided with a communication port for communicating the device accommodating space to the outside, and a position near the communication port is provided in the device accommodating space. The exhaust fan that sucks out the hot air generated in the outside is provided.

According to such a configuration, even if the air in the equipment housing space is heated by the heat generated by the equipment housed in the equipment housing space, the exhaust fan is operated to protect the equipment housing space. Hot air in the device housing space can be forcibly sucked out through the communication port provided in the cover, and the room temperature in the cab can be lowered. In particular, since the exhaust fan forcibly sucks out the air in the equipment housing space to the outside, the inside of the equipment housing space tends to have a negative pressure, so that it is possible to suppress the hot air in the equipment housing space from flowing into the cab. Thus, the room temperature in the cab can be further reduced.

The invention according to claim 2 is that the exhaust fan is located near the communication port and attached to the protective cover.

According to such a configuration, by attaching the exhaust fan to the protective cover, when the protective cover is attached so as to cover the equipment accommodating space, the exhaust fan is simultaneously disposed in the equipment accommodating space. Can be.

Further, according to a third aspect of the present invention, a fan fixing device is provided inside the protective cover near the communication port, and the exhaust fan is fixedly attached to the fan fixing device. I did it.

According to such a configuration, by operating the exhaust fan, the hot air in the equipment accommodating space can be sucked out through the communication port opened near the exhaust fan.

The invention according to claim 4 is that the fan fixture has a duct formed between the fan fixture and the protective cover, and the duct guides hot air from the exhaust fan to the communication port.

According to such a configuration, when the exhaust fan is operated, the hot air in the equipment housing space is guided to the communication port by the duct formed between the protective cover and the fan fixing device. The internal hot air can be efficiently extracted to the outside.

Further, according to the invention of claim 5, a grommet member having a duct is provided at a communication port of the protective cover,
The grommet member has a configuration in which the exhaust fan is fitted and attached.

According to this structure, the exhaust fan is fixed to the protective cover via the grommet member. Therefore, by using the flexible grommet member, vibrations during operation of the working machine and the like are reduced. Can be prevented.

According to a sixth aspect of the present invention, the grommet member includes a frame-shaped peripheral wall, a front wall closing a front side of the peripheral wall and forming a duct between the peripheral wall, and an outer surface of the peripheral wall. Grommet mounting groove provided on the side of the protective cover and fitted to the communication port of the protective cover, and provided on the front wall side of the grommet mounting groove and below the peripheral wall to exhaust hot air guided to the duct. And a fan mounting groove provided on the inner surface side of the peripheral wall at a position rearward of the grommet mounting groove and fitted with the exhaust fan.

According to such a configuration, the grommet mounting groove is fitted to the communication opening of the protective cover in a state where the exhaust fan is fitted to the fan mounting groove of the grommet member. Can be mounted on In this case, by operating the exhaust fan,
The hot air in the device accommodating space is guided to the duct of the grommet member, and is then sucked out through the exhaust port.

[0025]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an embodiment of a swing type working machine according to the present invention will be described with reference to the drawings, taking a small swing type hydraulic excavator as an example.

First, FIGS. 1 to 6 show a first embodiment according to the present invention.
Is shown.

In the drawings, reference numeral 1 denotes a hydraulic shovel as a swing-type working machine. The hydraulic shovel 1 has a lower traveling body 2 and an upper part which is mounted on the lower traveling body 2 via a pivoting device 3 so as to be pivotable. The revolving superstructure 4, an earth removal device 5 provided in front of the lower traveling body 2 for performing earth removal work, leveling work, and the like, and an elevating to the front side of the upper revolving superstructure 4 for performing excavation work and the like. A work device 6 is provided so as to be movable and swingable in the left-right direction.

Here, the excavator 1 is designed so that the upper swing body 4 can be swung at a narrow work site.
This is a so-called small swing type hydraulic excavator in which the swing radius of the upper swing body 4 is reduced. As shown in FIG. 2, the upper swing body 4 is formed in a substantially circular shape when viewed from above.

The upper swing body 4 is generally constituted by a swing frame 7, a machine room 8, an operator's cab 13, and the like, which will be described later.

Here, the revolving frame 7 has a skeletal structure of the upper revolving unit 4, and as shown in FIG. 5 and the like, a bottom plate 7A formed in a circular plate shape and an intermediate portion in the width direction of the bottom plate 7A. And a pair of vertical plates 7B (only one is shown) extending in the front-rear direction, and a horizontal plate 7 separating the machine room 8 and the operation room 13 from each other.
C. And, on the front end side of the vertical plate 7B,
A bracket 7D (see FIG. 1) that supports the working device 6 so as to be able to move up and down and swing is provided. Further, mount members 7E, 7E,... That support the cab 13 are provided on the left front side of the bottom plate 7A.

Reference numeral 8 denotes a machine room which is disposed on the revolving frame 7 at the rear side of the upper revolving unit 4 and is covered with a building cover. In the machine room 8, an engine 9, a hydraulic pump 10, The tank 11 and the like are accommodated. Reference numeral 12 denotes a counterweight provided on the revolving frame 7 at the rear side of the machine room 8. The counterweight 12 balances with the working device 6 during the revolving operation of the upper revolving unit 4.

Reference numeral 13 denotes an operator's cab disposed on the revolving frame 7 at the front left side of the upper revolving unit 4, and the operator's cab 13 is provided with a bottom plate 7A of the revolving frame 7 via each mounting member 7E. It is surrounded by a floor plate 14 provided thereon, and a building 15 composed of a front plate, a rear plate, left and right side plates, and a ceiling plate formed of a steel plate or the like.
A is provided to be openable and closable. As shown in FIG. 3, a driver's seat 16 for the operator to sit down, operation levers 17 located on both left and right sides of the driver's seat 16, and a driver's seat 16 are located inside the driver's cab 13. A plurality of traveling pedals 18, 18,... Are provided.

Reference numeral 19 denotes an equipment accommodating space formed between the floor plate 14 of the cab 13 and the bottom plate 7A of the revolving frame 7, and the equipment accommodating space 19 is provided on the bottom plate 7 of the revolving frame 7.
A, a vertical plate 7B, a horizontal plate 7C, a floor plate 14, side covers 21, a front cover 22, and the like, which will be described later.

Reference numeral 20 denotes a control valve housed in the equipment housing space 19. The control valve 20 includes a traveling motor of the lower traveling body 2, a swing motor of the swing device 3, a hydraulic cylinder of the earth discharging device 5, and a working device 6. Is configured as an aggregate (multiple valves) of a number of directional control valves, relief valves, brake valves, pilot valves, etc., for controlling the supply and discharge of the hydraulic oil discharged from the hydraulic pump 10 to each hydraulic actuator such as each hydraulic cylinder. ing. The control valve 20
Are heating elements that generate heat when hot oil is supplied and discharged from the hydraulic pump 10.

Reference numeral 21 denotes a side cover as a protective cover disposed below the operator's cab 13 and disposed on the side of the upper revolving unit 4. The side cover 21 covers a side surface of the equipment housing space 19. It protects the control valve 20 housed in the equipment housing space 19.

The protective cover for covering the equipment housing space 19 is located at the front of the side cover 21 and the upper revolving unit 4 and covers the front of the equipment housing space 19.
2. It consists of other covers.

As shown in FIGS. 4 and 5, the side cover 21 has a side plate portion 21A extending in an arc shape corresponding to the turning radius of the upper turning body 4, and an upper turning portion from the upper end of the side plate portion 21A. An upper plate portion 21B extending inside the body 4 and bolted to the floor plate 14, and a lower plate extending from the lower end of the side plate portion 21A inside the upper revolving unit 4 and bolted to the bottom plate 7A of the revolving frame 7. The portion 21C is formed to have a substantially U-shaped cross section.

Reference numeral 23 denotes a communication port provided on the rear side of the side cover 21. As shown in FIG.
It is formed as a long hole extending in the longitudinal direction of the side cover 21, and communicates the equipment housing space 19 surrounded by the side cover 21 with the outside. In addition, the communication port 23
Is formed between the lower end of the side plate 21A of the side cover 21 and the lower plate 21C in order to prevent rainwater or the like from entering the equipment housing space 19.

Reference numeral 24 denotes an exhaust fan which is located near the communication port 23 and is disposed in the equipment accommodating space 19. The exhaust fan 24 has a rectangular frame-shaped casing 24A as shown in FIGS. A stator 24B fixed to the center of the casing 24A, and a rotor 24D rotatably provided on the outer peripheral side of the stator 24B and having a plurality of fans 24C fixed to the outer peripheral side thereof. When the rotor 24D rotates with the fan 24C by supplying power to the stator 24B, the exhaust fan 24 forcibly removes the air in the device housing space 19 to the outside through the communication port 23 formed in the side cover 21. It sucks out.

Numeral 25 designates the exhaust fan 24 as the side cover 21
The bracket 25 has a rectangular mounting plate portion 25B having a large-diameter ventilation hole 25A formed in the center, and a U-shaped cross section from both sides of the mounting plate portion 25B. A pair of side plate parts 2 bent so as to form
5C.

Here, the edge of each side plate portion 25C is formed so as to have substantially the same cross-sectional shape as the side cover 21 so as to be in close contact with the inner peripheral surface of the side cover 21. And
As shown in FIGS. 4 and 6, the bracket 25 is attached to the side cover 2 such that each side plate 25C sandwiches the communication port 23.
1 is welded to the inner peripheral surface of the side cover 21.
An exhaust duct 26 is formed between the bracket and the bracket 25.

The mounting plate 25B of the bracket 25
, A casing 24 </ b> A of the exhaust fan 24 is fixed by a plurality of bolts 27. Therefore, the exhaust fan 2
When the device 4 is operated, the air in the device housing space 19 is guided to the communication port 23 through the exhaust duct 26 between the side cover 21 and the bracket 25, and is efficiently discharged to the outside through the communication port 23. ing.

The present embodiment has the above-described configuration, and its operation will be described below.

First, when the engine 9 is operated, the pressure oil discharged from the hydraulic pump 10 is supplied to the control valve 20, and the traveling motor and the operation motor 17 are operated according to the operation of the operation lever 17 and the pedal 18 disposed in the cab 13. It is supplied to and discharged from hydraulic actuators such as a swing motor and a hydraulic cylinder. The control valve 20 is connected to the hydraulic pump 10
Heat is generated by supplying the high-pressure oil discharged from the control valve 20, and the heat in the control valve 20 heats the air in the device housing space 19.

At this time, by operating the exhaust fan 24, the hot air in the equipment housing space 19 heated by the heat generated by the control valve 20 causes the side cover 21 and the bracket 25 to move as indicated by an arrow A in FIG. The air is guided to the communication port 23 through the exhaust duct 26 formed therebetween, and is forcibly sucked to the outside through the communication port 23. Thus, the floor plate 14 can be prevented from being heated by the hot air in the equipment housing space 19, and the feet of the driver's seat 16 can be cooled.

Further, by forcibly sucking the air in the equipment housing space 19 to the outside by the exhaust fan 24,
Since the interior of the equipment housing space 19 tends to have a negative pressure, hot air in the equipment housing space 19 flows into the cab 13 through an insertion hole (not shown) through which electrical wiring, a control cable, and the like are formed in the floor panel 14. Can be suppressed, and the room temperature in the cab 13 can be lowered.

Further, even if, for example, cooling air introduced into the machine room 8 and heated by the engine 9 enters the equipment housing space 19, the cooling air is discharged to the outside through the communication port 23. Thus, it is possible to prevent the room temperature in the cab 13 from rising due to the cooling air warmed by the engine 9.

As described above, according to the present embodiment, the equipment accommodation space 19 formed below the floor plate 14 of the cab 13
The communication port 23 is provided in the side cover 21 that covers the communication port 23, and the exhaust fan 24 is provided in the device accommodation space 19 near the communication port 23. Even if hot air is generated in the device housing space 1 by the exhaust fan 24,
The hot air inside 9 can be forcibly sucked out through the communication port 23 to the outside.

Thus, it is possible to prevent the floor plate 14 of the cab 13 from being heated by the hot air in the equipment housing space 19, and to prevent the hot air in the equipment housing space 19 from being heated.
Can be suppressed. In this way,
The operation efficiency of the excavator 1 can be improved by cooling the feet of the driver's seat 16 and lowering the room temperature in the driver's cab 13.

Further, the exhaust fan 24 is connected to the bracket 25
Because it was configured to be attached to the side cover 21 through
By attaching the side cover 21 to which the exhaust fan 24 has been attached in advance to the upper revolving unit 4, the exhaust fan 24 can be easily arranged in the equipment accommodating space 19, and the work of attaching the exhaust fan 24 can be easily performed. be able to.

Further, the side cover 21 and the bracket 2
5, when the exhaust fan 24 is operated, the device accommodation space 1
Since the exhaust duct 26 for guiding the hot air in the device 9 to the communication port 23 is formed, the hot air in the equipment housing space 19 can be efficiently sucked out through the communication port 23 to the outside, and the room temperature in the cab 13 can be more effectively reduced. Can be reduced.

Next, FIGS. 7 and 8 show a second embodiment according to the present invention.
Is shown. In the present embodiment, the same components as those in the above-described first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

In the drawing, reference numeral 31 denotes a side cover applied to the present embodiment, and the side cover 31 is the first cover.
Almost in the same manner as the side cover 21 according to the embodiment, the side plate portion 31A extends in an arc shape corresponding to the turning radius of the upper turning body 4, and the side plate 31A extends from the upper end of the side plate portion 31A to the inside of the upper turning body 4. Although it is composed of a plate portion 31B and a lower plate portion 31C extending from the lower end of the side plate portion 31A to the inside of the upper swing body 4, the side plate portion 31A is replaced with the communication port 23 according to the first embodiment described later. A rectangular communication port 32 for attaching the grommet member 33 is formed.

Reference numeral 33 denotes a grommet member as a fan fixture applied to this embodiment in place of the bracket 25 according to the first embodiment.
Is integrally molded of a flexible material such as rubber or resin.

Here, as shown in FIGS. 7 and 8, the grommet member 33 has a peripheral wall 33A having a rectangular frame shape.
A front wall 33B closing the front side of the peripheral wall 33A, and an exhaust duct 3 formed between the front wall 33B and the peripheral wall 33A.
3C, a grommet mounting groove 33D formed all around the outer surface of the peripheral wall 33A, and the grommet mounting groove 33D.
An exhaust port 33E provided on the front wall 33B side and below the peripheral wall 33A to exhaust the hot air guided to the exhaust duct 33C to the outside, and a peripheral wall located behind the grommet mounting groove 33D. And a fan mounting groove 33F formed on the entire inner surface of the fan 33A.

Reference numeral 34 denotes a grommet member 3 for the exhaust fan 24.
3 is a mounting plate for mounting on the mounting plate 3.
Numeral 4 is formed in a substantially square shape from a steel plate or the like, and a large-diameter ventilation hole 34A is formed at the center thereof. The mounting plate 34 may be formed integrally with the casing 24A of the exhaust fan 24.

The exhaust fan 24 has a plurality of bolts 2
7, the outer peripheral edge of the mounting plate 34 is fitted to the fan mounting groove 3 of the grommet member 33.
The exhaust fan 24 is attached to the grommet member 33 by fitting to the 3F. In this case, since the grommet member 33 has flexibility, the fan mounting groove 33
By deforming the periphery of F, the mounting plate 34 can be easily fitted into the fan mounting groove 33F.

In this state, the exhaust fan 24 is moved from the outside of the side cover 31 through the communication port 32 to the device housing space 19.
The grommet member 33 is attached to the side cover 31 as shown in FIG. 7 by inserting the grommet attachment groove 33 </ b> D of the grommet member 33 into the inner peripheral edge of the communication port 32. Also in this case, by deforming the peripheral portion of the grommet mounting groove 33D, the grommet mounting groove 33D can easily be connected to the communication port 32 of the side cover 31.
It can be fitted to.

In this way, the grommet member 33 is attached to the side cover 31 with the exhaust fan 24 fitted inside the peripheral wall 33A. At this time, the exhaust port 33E of the grommet member 33 is connected to the outside of the side cover 31. It is configured to open downward.

This embodiment has the above-described structure. When the exhaust fan 24 is operated, the hot air in the equipment housing space 19 heated by the control valve 20 is turned off as shown by an arrow B in FIG. , Grommet member 33
After being led to the exhaust duct 33C, the air is forcibly sucked out through the exhaust port 33E. Thereby, the first
Similarly to the embodiment, by suppressing the floor plate 14 of the cab 13 from being heated by the hot air in the equipment housing space 19, the feet of the driver's seat 16 can be cooled,
By suppressing the flow of hot air in the equipment housing space 19 into the cab 13, the room temperature in the cab 13 can be reduced.

In addition, according to the present embodiment, the exhaust fan 24 is mounted on the side cover 31 via the flexible grommet member 33. Therefore, it is prevented from being directly transmitted to the exhaust fan 24. Thus, the life of the exhaust fan 24 can be extended, and the effect of suppressing the room temperature in the cab 13 can be maintained for a long time.

Further, in a state where the exhaust fan 24 is attached to the flexible grommet member 33, the grommet member 33 can be attached to the side cover 31 from the outside through the communication port 32. Workability can be greatly improved.

Further, since the grommet member 33 is a single rubber molded product, not only is the structure simple, but also the periphery of the communication port 32 of the side cover 31 can be reliably waterproofed.

In each of the above embodiments, the communication port 23
(32) is provided in the side cover 21 (31), and the exhaust fan 24 is provided in the vicinity of the communication port 23 (32). However, the present invention is not limited to this. A communication port may be provided in another cover constituting the protective cover such as the cover 22, and an exhaust fan may be provided near the communication port.

Further, in each of the above embodiments, the small swing hydraulic excavator has been described as an example of the swing work machine. However, the present invention is not limited to this, and the present invention is not limited to this. It can also be applied to machines.

[0066]

As described above in detail, according to the first aspect of the present invention, the protective cover for covering the equipment accommodating space formed below the floor plate of the driver's cab is provided with the communication port for communicating the equipment accommodating space to the outside. Is provided in the vicinity of the communication port, and an exhaust fan that sucks out the hot air generated by the heat generated by the device housed in the device housing space to the outside through the communication port is provided, so that the hot air is generated in the device housing space. Also, the hot air can be forcibly extracted to the outside through the communication port by the exhaust fan.

Thus, it is possible to prevent the floor plate of the cab from being heated by the hot air in the equipment accommodating space and to cool the feet of the driver's seat.

Also, since the exhaust fan forcibly sucks out the air in the equipment housing space to the outside, the inside of the equipment housing space tends to have a negative pressure. Therefore, it is possible to suppress the flow of hot air from the equipment housing space into the cab. It is possible to lower the room temperature in the cab. As a result, it is possible to improve the operating efficiency of the swing type working machine.

According to the second aspect of the present invention, the exhaust fan is located near the communication port and is attached to the protective cover. At the same time, the exhaust fan can be arranged in the device accommodating space, and the workability when mounting the exhaust fan can be improved.

Further, according to the third aspect of the present invention, a fan fixing member is provided near the communication port inside the protective cover, and the exhaust fan is fixedly attached to the fan fixing member. In addition, the hot air in the device housing space can be reliably drawn out to the outside through the communication port opened near the exhaust fan.

According to the fourth aspect of the present invention, a duct is formed between the fan fixture and the protective cover to guide the hot air in the equipment housing space to the communication port when the exhaust fan is operated. When the exhaust fan is operated, the hot air in the equipment housing space is guided to the communication port by the duct formed between the protective cover and the fan fixture, so that the hot air in the equipment housing space can be efficiently extracted to the outside.

Further, according to the fifth aspect of the present invention, since the grommet member having a duct is provided in the communication port of the protective cover and the exhaust fan is attached to the grommet member, for example, the grommet member having flexibility is provided. Is used, it is possible to prevent vibrations during operation of the work machine or the like from being directly transmitted to the exhaust fan. As a result, the life of the exhaust fan can be extended, and the effect of suppressing the room temperature in the cab can be maintained for a long time.

Further, according to the fifth aspect of the present invention, the grommet member includes a frame-shaped peripheral wall, a front wall that closes the front side of the peripheral wall and forms a duct between the peripheral wall, and an outer surface of the peripheral wall. Grommet mounting groove provided on the front wall side of the grommet mounting groove, provided on the lower side of the peripheral wall, and an exhaust port for exhausting hot air guided to the duct, provided on the inner surface side of the peripheral wall With the fan mounting groove, the exhaust fan can be easily mounted on the protective cover by fitting the grommet mounting groove into the communication port of the protective cover with the exhaust fan fitted in the fan mounting groove. it can.

In addition, since the grommet member is a single member having flexibility, vibration of the grommet is prevented from being transmitted to the exhaust fan, thereby not only extending the life of the exhaust fan but also providing the grommet on the protective cover. The waterproof property around the communication port can be improved.

[Brief description of the drawings]

FIG. 1 is a partially broken external view showing a small turning hydraulic excavator according to a first embodiment of the present invention.

FIG. 2 is a plan view showing a small turning hydraulic excavator.

FIG. 3 is a plan view showing a cab of the excavator in FIG. 2;

FIG. 4 shows a main part of the first embodiment, indicated by an arrow IV- in FIG.
It is the expanded sectional view seen from the IV direction.

FIG. 5 is an exploded perspective view showing a turning frame, a side cover, an exhaust fan, and the like.

FIG. 6 is a side view showing a communication port formed in a side cover as viewed from a direction indicated by arrows VI-VI in FIG. 4;

FIG. 7 is an enlarged sectional view showing a main part of the second embodiment, viewed from the same position as in FIG. 4;

FIG. 8 is an exploded perspective view showing a turning frame, a side cover, an exhaust fan, and the like.

[Explanation of symbols]

 Reference Signs List 2 Lower traveling body 4 Upper revolving body 7 Revolving frame 8 Machine room 9 Engine 13 Operating room 14 Floor plate 19 Equipment storage space 20 Control valve (equipment) 21, 31 Side cover (protective cover) 22 Front cover (protective cover) 23, 32 Communication port 24 Exhaust fan 25 Bracket (fan fixture) 26 Exhaust duct 33 Grommet member (fan fixture) 33A Peripheral wall 33B Front wall 33C Exhaust duct 33D Grommet mounting groove 33E Exhaust port 33F Fan mounting groove

Continuing on the front page (72) Inventor Nobukatsu Asakura 650, Kandachi-cho, Tsuchiura-shi, Ibaraki Prefecture Inside the Tsuchiura Plant of Hitachi Construction Machinery Co., Ltd. Industrial Co., Ltd.

Claims (6)

[Claims] An undercarriage includes an undercarriage and an undercarriage mounted on the undercarriage. The undercarriage includes an undercarriage.
A revolving frame, a machine room provided on the rear side of the revolving frame and containing an engine therein, an operator's cab provided on the revolving frame at a front side of the machine room, and below a floor plate of the operator's cab Formed between the side and the revolving frame,
In a revolving work machine including a device housing space in which a device capable of generating heat is housed and a protective cover that covers the device housing space from around the turning frame, the device housing space is provided in the protective cover. A revolving work machine, comprising: a communication port that communicates with the outside; and an exhaust fan that exhausts hot air generated in the device housing space to the outside at a position near the communication port. 2. The revolving work machine according to claim 1, wherein the exhaust fan is located near the communication port and attached to the protective cover. 3. The apparatus according to claim 1, wherein a fan fixture is provided inside the protective cover near the communication port, and the exhaust fan is fixedly attached to the fan fixture. The swiveling work machine as described. 4. The revolving work machine according to claim 3, wherein the fan fixture has a duct formed between the fan fixture and the protective cover, and the duct guides hot air from the exhaust fan to the communication port. 5. A grommet member having a duct is provided at a communication opening of the protective cover, and the exhaust fan is fitted to and attached to the grommet member.
The swiveling work machine according to claim 1. 6. The grommet member includes a frame-shaped peripheral wall, a front wall closing a front side of the peripheral wall and forming a duct between the peripheral wall, and the protective cover provided on an outer surface side of the peripheral wall. A grommet mounting groove fitted to the communication opening of the grommet; an exhaust port provided on the front wall side of the grommet mounting groove below the peripheral wall to exhaust hot air guided to the duct; The revolving work machine according to claim 5, further comprising a fan mounting groove which is provided on the inner surface side of the peripheral wall at a position rearward of the mounting groove, and which is fitted with the exhaust fan.