JP2000045768A - Construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To change the exhaust position of the exhaust gas corresponding to the contents of work or the like with a simple structure by mounting a plurality of connecting ports for connecting an external exhaust pipe on the outflow side of a silencer. SOLUTION: A prime mover 13 is accomodated in a machine house 5 of a hydraulic excavator, and a silencer 16 comprising two connecting ports is mounted on its exhaust side. An upper side exhaust pipe 20 which is upwardly extended, is connected to one connecting ports of the silencer 16, and the other connecting port is closed by a lid body 19. Whereby the exhaust gas of the prime mover 13 can be efficiently diffused from the upper side exhaust pipe 20 into the air. To prevent the noise of the driving-motor 13 from being conducted in the distance, one connecting ports of the silencer 16 is closed by the lid body 19, and a lower side exhaust pipe which is downwardly extended to a breather 11 is connected to the other connecting port.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a construction machine suitably used as, for example, a hydraulic excavator having a muffler, an exhaust pipe and the like.

[0002]

2. Description of the Related Art Generally, construction machines such as hydraulic excavators are
A construction machine body in which the interior closed by the building cover is a machine room, a prime mover disposed in the machine room of the construction machine body and serving as a power source of the machine, and an exhaust pipe provided on the exhaust side of the prime mover, A device provided with a muffler provided in the exhaust pipe is known.

[0003] In this type of conventional construction machine, an external exhaust pipe is fixed to the outflow side of the muffler, and the tip end protrudes outside the machine room through the upper surface side of the building cover. During the operation of the construction machine, when exhaust gas is exhausted from the prime mover, the exhaust gas flows through the silencer to reduce noise, and then is externally elevated at a high position from the ground via an external exhaust pipe. Is exhausted and diffused into the air.

On the other hand, as another prior art, an external exhaust pipe is branched in a machine room to provide an upper exhaust pipe and a lower exhaust pipe, and an exhaust direction switching valve is provided therebetween. Machines are also known (for example,
127732).

In this case, during operation of the construction machine, the driver switches the exhaust direction switching valve according to the work content and the like, so that the exhaust gas discharged from the prime mover is grounded via the upper exhaust pipe. The exhaust gas is exhausted at a position higher than the ground or this exhaust gas is exhausted at a position close to the ground via a lower exhaust pipe.

[0006]

By the way, in the above-mentioned prior art, the exhaust gas discharged from the prime mover is exhausted at a high position from the ground using an external exhaust pipe and diffused into the air. However, in this case, the noise generated by the prime mover is also emitted from the ground at a high position along with the exhaust gas, so this noise can be transmitted to a location far away from the work site despite being reduced by the silencer. is there.

For this reason, for example, when operating a construction machine at a work site near an urban area, the noise of the prime mover is likely to be transmitted to surrounding houses and the like, which not only disturbs the surroundings but also limits the working time. In some cases, noise countermeasures or the like are required specially, and there is a problem that the working efficiency is reduced.

On the other hand, in another conventional technique, two pipes including an upper exhaust pipe and a lower exhaust pipe must be arranged in a machine room together with a motor and a silencer. Since it is necessary to provide an exhaust direction switching valve at the connection with the lower exhaust pipe, these structures are complicated, and not only the number of parts increases, but also the housing space in the machine room becomes narrow.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to reduce the noise of the prime mover transmitted to the surroundings as necessary and to simplify the mechanism for suppressing the noise. In addition, another object of the present invention is to provide a construction machine capable of performing civil engineering work and the like smoothly without hindering the surrounding environment.

[0010]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a construction machine body in which the interior closed by a building cover is a machine room, and a machine arranged in the machine room of the construction machine body. The present invention is applied to a construction machine having a prime mover serving as a power source of the above, an exhaust pipe provided on the exhaust side of the prime mover, and a muffler provided on the exhaust pipe.

A feature of the structure adopted in the first aspect of the present invention is that, on the outflow side of the muffler, a plurality of connection ports opened at different positions from each other, and at least one of the connection ports is provided. An external exhaust pipe detachably connected to the connection port and exhausting exhaust gas flowing out of the muffler to the outside is provided.

With this configuration, it is possible to change a connection port for connecting an external exhaust pipe among the connection ports of the muffler, and to variably set a position where the external exhaust pipe discharges exhaust gas. As a result, for example, the external exhaust pipe can be extended upward or downward from the muffler, and the exhaust gas can be exhausted to the outside at the upper side or the lower side of the machine room by the external exhaust pipe.

According to the second aspect of the present invention, two connection ports of the muffler are provided apart from each other in an upward and downward direction, and the external exhaust pipe is connected to an upper connection port of the connection ports. It is constituted by an upper exhaust pipe having a distal end opening to the upper side of the machine room, and a lid provided by closing a lower connection port.

Thus, the upper exhaust pipe can be connected to the upper connection port of the muffler to extend upward from the muffler, and the exhaust gas can be exhausted at a high position from the ground by the upper exhaust pipe. Can be prevented from staying around the construction machine.

Further, in the third aspect of the present invention, two connection ports of the muffler are provided apart from each other in an upward and downward direction, and the external exhaust pipe is connected to a lower connection port of the connection ports. A lower exhaust pipe which is connected and whose distal end side opens to the lower side of the machine room,
And a lid provided by closing the upper connection port.

Thus, the lower exhaust pipe can be connected to the lower connection port of the muffler to extend downward from the muffler, and the exhaust gas can be exhausted at a position close to the ground by the lower exhaust pipe. The noise of the prime mover transmitted around the machine can be reduced.

Further, in the invention according to claim 4, each connection port of the muffler is provided two apart from each other in an upward and downward direction, and the external exhaust pipe is connected to an upper connection port of the muffler and has a tip. The exhaust pipe comprises an upper exhaust pipe opened on the upper side of the machine room, and a lower exhaust pipe connected to a lower connection port of the muffler and opened on the lower end side of the machine chamber.

Thus, exhaust gas can be exhausted from both the upper exhaust pipe and the lower exhaust pipe, and a large amount of exhaust gas can be prevented while preventing loud noise from being transmitted far from the upper exhaust pipe during operation of the prime mover. Exhaust from the lower exhaust pipe and stagnation around the construction machine can be suppressed.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A construction machine according to an embodiment of the present invention will be described below in detail with reference to FIGS.

FIGS. 1 to 3 show a first embodiment of the present invention. In this embodiment, a hydraulic excavator will be described as an example of a construction machine.

Reference numeral 1 denotes a lower traveling body of a hydraulic shovel, and 2 denotes an upper revolving body as a construction machine main body which is rotatably mounted on the lower traveling body 1. On the revolving frame 3 of the upper revolving body 2, A driver's cab 4, a machine room 5, a counterweight 6, and the like are provided, and a working device 7 for performing work such as excavation is mounted so as to be able to move up and down.

As shown in FIG. 2, the machine room 5 includes a substantially box-shaped building cover 8 attached to the revolving frame 3,
The building cover 8 is formed using an under cover 9 and the like attached to the revolving frame 3 at a position covering the lower side of the building cover 8, and the building cover 8 includes an upper surface 8A and left and right side surfaces 8B,
8C and the like.

And, on the upper surface 8A of the building cover 8,
Vents 10 and 11 for letting outside air flow into and out of the machine room 5;
An insertion port 12 through which an upper exhaust pipe 20 described later is inserted is provided. The under cover 9 also has a vent 1
0 and 11 are provided.

Further, a prime mover 13 constituting a power source of the hydraulic shovel, a radiator 14 for cooling the prime mover 13 and the like are provided in the machine room 5, and the prime mover 13 is provided with a cooling fan 13A. I have. During the operation of the prime mover 13, outside air is introduced as cooling air from the cooling fan 13A into the machine room 5 through, for example, each of the vents 10. The cooling air cools the radiator 14, the prime mover 13 and the like, and then the cooling air It is configured to flow out of the mouth 11 to the outside.

Reference numeral 15 denotes an exhaust pipe connected to the exhaust side of the prime mover 13. The exhaust pipe 15 is, as shown in FIG.
A is connected to each cylinder (not shown) of the prime mover 13, and the outflow side 15B extends away from the prime mover 13 and is connected to a muffler 16 described later. And the exhaust pipe 15
The exhaust gas exhausted from each of the cylinders silencer 16,
The air is exhausted to the outside through the upper exhaust pipe 20 and the like.

Reference numeral 16 denotes a silencer connected to the exhaust side of the prime mover 13 through an exhaust pipe 15. The silencer 16 includes a cylindrical casing 17 having both ends closed,
And a cylindrical body 18 protruding out of the casing 17 at both ends. Exhaust gas discharged from the prime mover 13 through the exhaust pipe 15 is caused to flow therethrough to thereby reduce noise. Is to be reduced.

Here, the motor 17 is mounted on the casing 17.
An inlet 17A through which exhaust gas flows from is provided, and an exhaust pipe 15 is connected to the inlet 17A. Also,
A large number of small-diameter holes are formed in the intermediate portion of the cylindrical body 18 in the axial direction and are located inside the casing 17 and communicate with the inside and outside of the cylindrical body 18.

Further, both ends of the cylindrical body 18 are opened at positions separated from above and below the hydraulic excavator. These openings are located on the outflow side of the silencer 16 and are provided for two external exhaust pipes. Connection ports 18A and 18B. An upper exhaust pipe 20 to be described later is detachably connected to the upper connection port 18A, and a bottomed cylindrical lid constituting an external exhaust pipe together with the upper exhaust pipe 20 is connected to the lower connection port 18B. The body 19 is detachably attached, and the lid 19 is connected to the connection port 1.
8B is closed.

Reference numeral 20 denotes an upper exhaust pipe as an external exhaust pipe. The upper exhaust pipe 20 is formed of a cylindrical body bent in a substantially "U" shape, and has a base end on the upper connection port 18A of the muffler 16.
To the building cover 8
Protrudes out of the machine room 5 through the insertion port 12.
The upper exhaust pipe 20 exhausts exhaust gas flowing out of the muffler 16 from above the upper swing body 2 to the outside of the machine room 5.

The hydraulic shovel according to the present embodiment has the above-described configuration, and during operation of the hydraulic shovel,
Exhaust gas discharged from the prime mover 13 flows through the muffler 16 through the exhaust pipe 15, and the exhaust gas is exhausted to a high position above the ground via the upper exhaust pipe 20, and at this time together with the exhaust gas Noise generated from the prime mover 13 is reduced by the muffler 16.

Thus, in the present embodiment, the muffler 16
Two connection ports 18A separated upward and downward from the cylindrical body 18 of
18B, and an upper exhaust pipe 2 is provided at the upper connection port 18A.
0 is detachably connected, and a lid 19 is provided at the lower connection port 18B.
Can be extended upward from the silencer 16 to the outside of the machine room 5, and the exhaust gas discharged from the prime mover 13 is
By using the upper exhaust pipe 20 or the like, the air can be exhausted to the outside at a high position from the ground.

Thus, during operation of the excavator,
The exhaust gas of the prime mover 13 can be efficiently diffused into the air from the upper exhaust pipe 20 while suppressing noise by the silencer 16,
The exhaust gas can be reliably prevented from staying around the excavator, and the working environment at this time can be favorably maintained even when civil engineering work or the like is performed around the excavator.

The upper exhaust pipe 2 according to this embodiment
When it is desired to particularly suppress noise transmitted from the prime mover 13 to the surroundings with respect to 0 or the like, a lid 19 is attached to the upper connection port 18A of the muffler 16 and the lower connection port 18B is ventilated by the under cover 9. Another exhaust pipe extending toward the port 11 (for example, a lower exhaust pipe 31 described later shown in FIG. 4) may be connected, and in this case, a configuration using the upper exhaust pipe 20 may be used. The silencer 16, the cover 19 and the like can be shared.

Thus, the connection position of the external exhaust pipe with respect to the single silencer 16 can be easily changed, and the exhaust gas discharge position can be variably set by a simpler mechanism than in the prior art. Cost can be reduced. In addition, it is possible to reduce the need for the exhaust gas to stay around the excavator or to transmit the loud noise of the motor 13 to a place away from the work site, as required, and to hinder the surrounding environment of the work site by the excavator. Without the need for civil engineering work.

Next, FIG. 4 shows a second embodiment according to the present invention. In this embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof will be described. It shall be omitted. However, a feature of the present embodiment is that the silencer 16 is provided with a lower exhaust pipe 31 as an external exhaust pipe.

Here, the muffler 16 includes a casing 17
And a cylindrical body 18, and a connection port 18 </ b> A of the cylindrical body 18,
A lid 19 is detachably attached to the upper connection port 18A of the connection port 18B.

The lower exhaust pipe 31 has a base end side detachably connected to the lower connection port 18B of the cylindrical body 18, extends downward from the muffler 16 toward the under cover 9, and has a distal end side under under. The cover 9 is open near the ventilation port 11. As a result, the exhaust gas exhausted from the prime mover 13 is exhausted to the outside via the silencer 16, the lower exhaust pipe 31, and the vent 11 at a position closer to the ground than in the first embodiment.

Further, at this time, the exhaust gas is
The cooling fan 13A flows out of the vent 11 together with the cooling air generated in the machine room 5, and the cooling air promotes the outflow to the outside. Note that the cover 32 may be detachably attached to the insertion opening 12 of the building cover 8.

Thus, also in the present embodiment configured as described above, it is possible to obtain substantially the same operation and effect as in the first embodiment. And especially in this embodiment,
A lid 19 is attached to the connection port 18A on the upper side of the silencer 16,
Since the lower exhaust pipe 31 is configured to be connected to the lower connection port 18B, the lower exhaust pipe 31 can be extended downward from the muffler 16 to the vicinity of the vent 11 of the under cover 9 and discharged from the prime mover 13. The exhaust gas to be exhausted can be exhausted outside at a position close to the ground by using the muffler 16, the lower exhaust pipe 31, the ventilation port 11, and the like.

Thus, during operation of the excavator,
The loud noise of the prime mover 13 can be surely reduced from being transmitted to a place distant from the work site. For example, even in a work site near an urban area, a hydraulic excavator can smoothly perform civil engineering work without disturbing the environment around the work site. it can.

Next, FIG. 5 shows a third embodiment of the present invention. In this embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted. It shall be omitted. However, the feature of this embodiment is that the upper exhaust pipe 20 is detachably connected to the upper connection port 18A of the muffler 16, and the lower connection port 18B is connected to the lower connection port 18B of the second embodiment. The lower exhaust pipe 41 having substantially the same structure as the exhaust pipe 31 is detachably connected.

Thus, also in the present embodiment configured as described above, it is possible to obtain substantially the same operation and effect as in the first and second embodiments. In particular, in the present embodiment, exhaust gas discharged from the prime mover 13 can be exhausted to the outside from both the upper exhaust pipe 20 and the lower exhaust pipe 41, and large noise is generated during operation of the prime mover 13. 2
It is possible to prevent a large amount of exhaust gas from being exhausted from the lower exhaust pipe 41 and to stay around the hydraulic shovel while preventing transmission from zero to far.

In the above embodiments, the silencer 16
Is provided with two connection ports 18A and 18B.
The present invention is not limited to this. For example, three or more connection ports are provided in a muffler, and an upper exhaust pipe, a lower exhaust pipe, a lid, and the like can be detachably attached to any of these connection ports. It may be configured to be connected.

In each of the above embodiments, a hydraulic excavator has been described as an example of a construction machine. However, the present invention is not limited to this, and may be applied to construction machines such as cranes and wheel loaders. The present invention can be applied to any construction machine having a configuration in which a muffler is provided on the exhaust side of a prime mover.

[0045]

As described above in detail, according to the first aspect of the present invention, a plurality of connection ports are provided on the outflow side of the muffler, and the connection ports are detachably attached to at least one of the connection ports. Since the external exhaust pipe to be connected is provided, the connection port for connecting the external exhaust pipe among the respective connection ports of the muffler can be easily changed, and the exhaust gas discharge position by the external exhaust pipe can be changed as compared with the related art. It can be set variably with a simple mechanism. As a result, the exhaust gas from the prime mover can be exhausted at a higher position from the ground by an external exhaust pipe or at a position closer to the ground depending on the use conditions of the construction machine. Therefore, it is possible to reduce as necessary the exhaust gas staying around the construction machine or the loud noise of the prime mover from the work site to a place distant from the work site. Can be performed smoothly.

According to the second aspect of the present invention, the external exhaust pipe is constituted by the upper exhaust pipe connected to the upper connection port of the muffler, and the lid closing the lower connection port. The exhaust gas discharged from the prime mover can be exhausted from a high position to the outside from the ground using a silencer, an upper exhaust pipe, and the like, and the exhaust gas can be efficiently diffused into the air.
Thereby, it is possible to reliably prevent the exhaust gas from staying around the construction machine, and to maintain the working environment at this time well even when performing civil engineering work or the like around the construction machine.

Further, according to the third aspect of the present invention, the external exhaust pipe is constituted by the lower exhaust pipe connected to the lower connection port of the muffler and the lid closing the upper connection port. The exhaust gas from the prime mover can be exhausted outside at a position close to the ground using a muffler, a lower exhaust pipe, and the like.
As a result, during operation of the construction machine, noise from the prime mover can be reduced from being transmitted to a location distant from the work site.For example, even in a work site near an urban area, civil works can be smoothly performed without disturbing the environment around the site. Can be done.

According to the fourth aspect of the present invention, since the external exhaust pipe is constituted by the upper exhaust pipe and the lower exhaust pipe,
Exhaust gas from the prime mover can be exhausted from both the upper exhaust pipe and the lower exhaust pipe to the outside, preventing large noise from being transmitted far from the upper exhaust pipe during operation of the prime mover, Exhaust from the side exhaust pipe and stagnation around the construction machine can be suppressed.

[Brief description of the drawings]

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

FIG. 2 is a vertical cross-sectional view of the hydraulic shovel as viewed from a direction indicated by arrows II-II in FIG.

FIG. 3 is an enlarged sectional view of a main part of the muffler, upper exhaust pipe and the like in FIG. 2 cut away.

FIG. 4 is an enlarged cross-sectional view of a main part of a hydraulic excavator according to a second embodiment, viewed from the same position as FIG.

FIG. 5 is a cutaway view of a silencer, an upper exhaust pipe, a lower exhaust pipe, and the like of the hydraulic shovel according to the third embodiment.
It is the principal part expanded sectional view seen from the same position as (1).

[Explanation of symbols]

 2 Upper revolving superstructure (work equipment main body) 5 Machine room 8 Building cover 13 Motor 15 Exhaust pipe 16 Silencer 18 Cylindrical body 18A, 18B Connection port 19 Lid 20 Upper exhaust pipe (external exhaust pipe) 31, 41 Lower exhaust Pipe (external exhaust pipe)

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Tomohiko Yasuda 650 Kandamachi, Tsuchiura-shi, Ibaraki F-term inside the Tsuchiura Plant of Hitachi Construction Machinery Co., Ltd.

Claims (4)

[Claims] 1. A construction machine body in which the interior closed by a building cover is a machine room, a prime mover disposed in the machine room of the construction machine body and serving as a power source of the machine, and provided on an exhaust side of the prime mover. A construction machine comprising an exhaust pipe and a muffler provided in the exhaust pipe, wherein, on the outflow side of the muffler, a plurality of connection ports opened at different positions from each other; A construction machine provided with an external exhaust pipe detachably connected to at least one connection port and exhausting exhaust gas flowing out of the muffler to the outside. 2. Each of the mufflers has two connection ports separated from each other in the upward and downward directions, and the external exhaust pipe is connected to an upper connection port of the connection ports, and a distal end of the external exhaust pipe is connected to the machine room. The construction machine according to claim 1, comprising an upper exhaust pipe opened to the upper side and a lid provided by closing a lower connection port. 3. The muffler is provided with two connection ports separated from each other in an upward and downward direction, and the external exhaust pipe is connected to a lower connection port of the connection ports, and a distal end side of the muffler is connected to the machine room. 2. The construction machine according to claim 1, comprising a lower exhaust pipe opened to a lower side of the airbag, and a lid provided by closing an upper connection port. 3. 4. The muffler has two connection ports which are spaced apart upward and downward, and the external exhaust pipe is connected to an upper connection port of the muffler, and a distal end is located on an upper side of the machine room. 2. The construction machine according to claim 1, further comprising: an upper exhaust pipe that is open to the lower end; and a lower exhaust pipe that is connected to a lower connection port of the muffler and has a distal end opening to a lower side of the machine room. .