JP2003165346A - Construction machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To properly regulate the emission gas discharging direction from a tail pipe according to a working environment. <P>SOLUTION: An upper tail pipe insertion hole 8 is arranged on the lower part side of a counterweight 7, while a lower tail pipe insertion hole 6 is arranged on the bottom plate 5A rear part side in a turning frame 5. A muffler 13 having a tail pipe 15 constructed of a flexible pipe is connected to the exhaust side of an engine 11. The tip 15A side of the tail pipe 15 is inserted into the tail pipe insertion holes 6 and 8 with an interval S. In this way, the tip 15A side of the tail pipe 15 can be bent horizontally or extended downward almost vertically. <P>COPYRIGHT: (C)2003,JPO

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, a hydraulic crane or the like.

[0002]

2. Description of the Related Art Generally, construction machines such as hydraulic excavators are
A lower traveling body and an upper rotating body which is rotatably mounted on the lower traveling body, and a work device for excavating earth and sand is provided on the front side of the upper rotating body so as to be able to descend and descend.

The upper revolving structure includes a revolving frame having a working device mounted on the front side, a driver's seat provided on the floor plate of the revolving frame, and a counterweight provided on the rear end side of the revolving frame. , And an engine mounted on a revolving frame located on the front side of the counterweight.

A muffler having a tail pipe is provided on the exhaust side of the engine. Then, when the hydraulic excavator is in operation, the exhaust gas discharged from the engine passes through the muffler to reduce the exhaust noise, and then is discharged to the outside from the tail pipe.

By the way, when the tip end side of the tail pipe is arranged in a substantially horizontal direction, it is said that the exhaust gas of the engine directly hits the worker standing near the hydraulic excavator in, for example, the foundation digging work of a general house or road construction. Defect occurs. Further, when the tip end side of the tail pipe is arranged almost directly below, workers who perform electrical wiring work, sewer work, etc. may be directly exposed to exhaust gas in a narrow space. In addition, there is a problem that the exhaust gas is blown to the plants such as hedges in the vicinity of the hydraulic excavator regardless of whether the tip end side of the tail pipe is arranged horizontally or directly below.

In order to solve such a problem, in another prior art, there is a structure in which a tail pipe is provided with an exhaust pipe whose tip is inclined so as to be rotatably fixed ( For example, Japanese Utility Model Publication No. 6-39545, etc.).

In this case, by appropriately rotating the exhaust pipe with respect to the tail pipe, it is possible to adjust the discharge direction of the exhaust gas from the exhaust pipe so that the influence on plants such as hedges is small.

[0008]

By the way, in the other prior art described above, the tip end side of the exhaust pipe attached to the tail pipe is merely inclined, and the exhaust pipe is rotated with respect to the tail pipe. With this alone, the exhaust pipe cannot be opened, for example, substantially horizontally or just below. As a result, there is a problem that it is difficult to change the mounting position of the exhaust stack to an appropriate position according to the environment of the work site.

Further, since the exhaust pipe is fixedly attached to the tail pipe, a bolt or the like can be loosened using a tool or the like every time the exhaust pipe mounting position is changed.
There is a problem that the work using such a tool is troublesome for the worker because the work needs to be tightened or ground.

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 that a discharge direction of exhaust gas from a tail pipe can be appropriately adjusted according to a working environment, which is a troublesome tool. It is to provide a construction machine that can eliminate the use of

[0011]

In order to solve the above-mentioned problems, a construction machine according to the present invention comprises a frame forming a support structure, a counter weight provided on the rear side of the frame, and a front side of the counter weight. The engine includes a positionally mounted engine mounted on the frame, and a muffler provided on the exhaust side of the engine and having a tail pipe for discharging exhaust gas to the outside.

A feature of the configuration adopted by the invention of claim 1 is that the tip end side of the tail pipe is configured to be bendable in an arbitrary direction. With this configuration, the tip side of the tail pipe can be bent.By bending the tip side of the tail pipe, the exhaust gas exhaust direction from the tail pipe can be adjusted according to the surrounding work environment. Can be adjusted in any direction.

Further, in the invention of claim 2, the tip end side of the tail pipe is opened to the lower side of the counterweight. With this configuration, the exhaust gas from the tail pipe can be discharged from the lower side of the counterweight, and the exhaust gas can be prevented from flowing out to, for example, the engine side, the cab side of the construction machine, or the like. it can.

In the invention of claim 3, the tail pipe is constructed as a flexible pipe having flexibility. With this configuration, the tip end side of the flexible tail pipe can be easily bent in any direction.

Further, in the invention of claim 4, the tail pipe is provided with a turning plate which is turnable at its tip end side. With this configuration, the rotating plate can be rotated, for example, in the upward and downward directions on the tip end side of the tail pipe. Therefore, when the rotating plate is rotated upward, exhaust gas from the tail pipe can be discharged upward, and when the rotating plate is rotated downward, exhaust gas can be discharged downward.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION A construction machine according to an embodiment of the present invention will be described in detail below with reference to a hydraulic excavator as an example with reference to the accompanying drawings.

1 to 6 show a first embodiment of the present invention, in which 1 is a hydraulic excavator applied to the embodiment, and the hydraulic excavator 1 comprises a lower traveling body 2 and a turning structure. The upper revolving structure 4 is provided so as to be revolvable on the lower traveling structure 2 through the device 3, and a working device (not shown) provided on the front side of the upper revolving structure 4. . Here, the upper revolving superstructure 4 is composed of a revolving frame 5, counterweights 7, 9, 10 and an engine 11 which will be described later.

Reference numeral 5 denotes a swivel frame which forms a support structure for the upper swivel body 4, and the swivel frame 5 has a bottom plate 5A and the like,
An engine 11 and the like are mounted on the bottom plate 5A. Here, a lower tail pipe insertion hole 6 formed of a substantially U-shaped cutout is formed on the left side of the rear end portion of the bottom plate 5A.

Reference numeral 7 denotes a central counterweight provided on the rear end side of the revolving frame 5, and the counterweight 7
Is a swing frame 5 via a bracket (not shown) or the like.
And a weight balance with a working device provided on the front end side of the revolving frame 5.

Here, on the lower side of the counterweight 7, there is formed an upper tail pipe insertion hole 8 consisting of a substantially U-shaped notch at a position corresponding to the tail pipe insertion hole 6 of the revolving frame 5. . Left and right counterweights 9 and 10 are provided on both the left and right sides of the counterweight 7.

Reference numeral 11 denotes an engine which is located on the front side of the counterweight 7 and is mounted on the bottom plate 5A of the revolving frame 5. The engine 11 is mounted in a laterally extending state extending in the left and right directions. Further, the engine 11 is provided with an exhaust manifold 12.

Reference numeral 13 is a muffler provided on the exhaust side of the engine 11 for reducing exhaust noise of the engine 11. The muffler 13 is provided with a muffler main body 14 in which a sound absorbing material is housed and which is connected to an exhaust manifold 12. , The muffler body 14
And a tail pipe 15 which will be described later.

Reference numeral 15 denotes a tail pipe extending downward from the muffler main body 14. The tail pipe 15 is formed as a flexible pipe having flexibility, for example, a bellows-shaped metal pipe, and its base end side (upper end side). Is connected to the muffler body 14. Also, the tip 15A of the tail pipe 15
The side (lower end side) opening is the exhaust port 15B. The end 15A side of the tail pipe 15 is located on the lower side of the counterweight 7, and the tail pipe insertion hole 6 is formed.
It is inserted into the inside of the container 8 and opens to the outside to the atmosphere side.

Here, the tail pipe 1 is provided between the tip 15A side of the tail pipe 15 and the tail pipe insertion holes 6 and 8.
As shown in FIG. 5, a gap S is secured so that 5 can be bent. Therefore, when the tip end 15A side of the tail pipe 15 is bent in an arc shape as shown by the solid line in FIG. 5, the exhaust gas from the exhaust port 15B is discharged in a substantially horizontal direction.

Further, when the tip end 15A side of the tail pipe 15 is extended downward as shown by the alternate long and short dash line in FIG. 5, the exhaust gas from the exhaust port 15B is discharged almost directly below. In this way, the tail pipe 15 has its tip 1
The outflow direction of the exhaust gas from the exhaust port 15B is arbitrarily adjusted according to the bending direction on the 5A side. Reference numeral 16 is a cab placed on the front side of the revolving frame 5.

The hydraulic excavator 1 according to the present embodiment has the above-described structure. The lower traveling body 2 is moved to move the hydraulic excavator 1 or the working device is raised and lowered on the front side of the upper revolving body 4 to raise and lower the earth and sand. Excavation work.

Here, in this embodiment, the tail pipe 15 is formed by using a flexible pipe, and the exhaust port 15B of the tail pipe 15 is passed through the tail pipe insertion holes 6 and 8 provided on the lower side of the counterweight 7. It is configured to open to the outside. And the tail pipe 1
Between the tip 15A side of 5 and the tail pipe insertion holes 6 and 8, a gap S is secured so that the tip 15A side can be bent.

Therefore, the tail pipe 15 can be bent in a substantially horizontal direction as shown by a solid line in FIG. 5, or can be extended almost right below as shown by a chain line in FIG. The discharge direction of the exhaust gas from the tail pipe 15 can be freely changed according to the environment, and consideration can be given to the operator, the environment, and the like.

Further, since the tail pipe 15 is formed by using a flexible pipe having flexibility, when the tip end 15A side is bent, the tip end 15A side can be easily bent without using a tool or the like, and workability is improved. Can be improved.

Further, since the exhaust port 15B of the tail pipe 15 is opened to the lower side of the counterweight 7, the exhaust gas from the exhaust port 15B does not flow out to the engine 11 side and the cab 16 side, and the hydraulic pressure is reduced. Shovel 1
It is possible to improve the performance and the like.

Next, FIGS. 7 to 10 show a second embodiment of the present invention, and the feature of this embodiment is that the turning plate is attached to the tip end side of the tail pipe.
In addition, in the present embodiment, the same components as those in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.

Reference numeral 21 denotes a tail pipe used in the present embodiment. The tail pipe 21 is arranged in the upper and lower directions, and the tip side (lower end side) of the tail pipe 21 is elongated in the upper and lower directions.
A and 21A are provided. Also, the tail pipe 21
Pins 21B and 21B are provided on the lower side of the elongated hole 21A.

Reference numeral 22 denotes a rotary plate rotatably provided on the tip end side of the tail pipe 21, and the rotary plate 22 is formed as a plate curved in a substantially U shape (concave curved shape). The rotating plate 22 is rotatably attached to the tip end side of the tail pipe 21 via the pins 21B and 21B.

Further, the rotating plate 22 has first semi-circular left and right notches 22B and 22B located at the upper end thereof.
Are formed. Further, U is provided on the side of the upper end of the rotating plate 22.
Left and right second notches 22C (only one is shown) having a letter shape are formed.

Reference numeral 23 is a lock pin attached between the tail pipe 21 and the rotating plate 22, and the lock pin 23 is
The tail pipe 21 is inserted into the elongated hole 21A in the left and right directions, and is movable up and down along the elongated hole 21A.

The lock pin 23 has the first notch 2
2B, the rotating plate 22 is attached to the tail pipe 2
It is fixed in a state where it extends almost directly from 1. In the state where the lock pin 23 is engaged with the second cutout 22C,
The rotating plate 22 is fixed so as to extend obliquely downward from the tail pipe 21 to the rear.

Thus, in this embodiment having such a configuration, it is possible to obtain substantially the same operational effects as those of the first embodiment. In particular, in the present embodiment, only by selectively engaging the lock pin 23 with the notches 22B and 22C of the rotating plate 22, the rotating plate 22 can be extended substantially right below the tail pipe 21 and can be slanted. The positioning can be performed in a state of being inclined downward, and the positioning work of the rotating plate 22 can be easily performed.

In the second embodiment, the rotating plate 22
The case where the first and second notches 22B and 22C are provided has been described as an example, but the present invention is not limited to this, and for example, as shown by a dashed line in FIG. The notch 22D may be additionally provided.

Further, in each of the embodiments, the hydraulic excavator has been described as an example of the construction machine, but the present invention is not limited to this, and may be applied to other construction machines such as a hydraulic crane and a wheel loader. You can

[0040]

As described above in detail, according to the invention of claim 1, the tail pipe tip side of the muffler provided on the exhaust side of the engine can be bent in any direction.
By bending the tip side of the tail pipe, the exhaust gas discharge direction from the tail pipe can be adjusted to any direction according to the surrounding work environment, etc., and it is possible to consider the operator, the environment, etc. it can.

Further, according to the invention of claim 2, since the tip end side of the tail pipe is opened to the lower side of the counterweight, the exhaust gas from the tailpipe can be discharged from the lower side of the counterweight, Exhaust gas can be prevented from flowing out to, for example, the engine side, the cab side of the construction machine, etc., and the performance of the construction machine can be improved.

Further, according to the invention of claim 3, since the tail pipe is constructed as a flexible pipe having flexibility, when the tail pipe is bent, the tail pipe can be easily bent without using a tool or the like. It is possible to improve the property.

Further, according to the invention of claim 4, since the rotating plate is rotatably provided on the tip end side of the tail pipe,
The turning plate can be turned, for example, in the upward and downward directions at the tip end side of the tail pipe, and the turning plate can easily change the exhaust gas discharge direction from the tail pipe.

[Brief description of drawings]

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

FIG. 2 is a right side view showing the hydraulic excavator in FIG.

FIG. 3 is an enlarged view of an essential part of the counterweight, engine, tail pipe and the like shown in FIG.

FIG. 4 is an enlarged cross-sectional view of the counterweight, the engine, the tail pipe, etc. as seen from the direction of arrows IV-IV in FIG.

5 is a partially enlarged sectional view showing a tail pipe insertion hole, a tail pipe and the like in FIG. 4 in an enlarged manner.

FIG. 6 is a bottom view of the tail pipe insertion hole, the tail pipe, etc., which is enlarged from the direction of arrows VI-VI in FIG.

FIG. 7 is a partially enlarged sectional view similar to FIG. 5, showing a tail pipe insertion hole, a tail pipe, and the like in a state in which a rotary hose according to the second embodiment is directed downward.

8 is a partially enlarged cross-sectional view similar to FIG. 7, showing a tail pipe insertion hole, a tail pipe, and the like in a state in which a rotating hose is horizontal.

9 is an enlarged cross-sectional view of the tail pipe viewed from the direction of arrow IX-IX in FIG. 7.

FIG. 10 is an enlarged cross-sectional view of the tail pipe viewed from the direction of arrow XX in FIG.

[Explanation of symbols]

4 Upper revolving structure 5 swivel frames 7,9,10 Counterweight 11 engine 13 muffler 15,21 tail pipe 15A tip 15B exhaust port 22 Rotating plate

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Claims (4)

[Claims] 1. A frame forming a support structure, a counterweight provided on a rear side of the frame, an engine mounted on the frame at a front side of the counterweight, and an exhaust side of the engine. A construction machine provided with a muffler provided with a tail pipe for discharging exhaust gas to the outside, wherein the tip end side of the tail pipe is configured to be bendable in an arbitrary direction. 2. The tip end side of the tail pipe is configured to open to the lower side of the counterweight.
Construction machine described in. 3. The construction machine according to claim 1, wherein the tail pipe is configured as a flexible pipe having flexibility. 4. The construction machine according to claim 1, wherein the tail pipe is provided with a turning plate which is turnable at a tip end side thereof.