JP2000027645A - Exhaust device for engine of working vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily change the exhaust gas discharging direction in response to the working environment. SOLUTION: In a working vehicle provided with a frame such as a turning frame loaded with an upper structure such as a working machine, a driver's seat, an engine 13 and a counter weight, a muffler 18 provided in the engine 13 is provided with exhaust tail pipe fitting pipes 23 at two positions on the upper side and the lower side thereof so as to enable the exhausting in the lower direction and the upper direction of the upper structure, and the lower and the upper exhaust tail pipes 23 are selectively fitted in response to the exhausting direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust device for an engine in a working vehicle such as a hydraulic shovel.

[0002]

2. Description of the Related Art An exhaust system for an engine in a work vehicle generally called a hydraulic excavator is an exhaust system in which an exhaust pipe is connected to a muffler inside an exhaust hole provided in a rear bonnet or a counterweight without protruding an exhaust pipe from a body exterior. With the tailpipe facing, exhaust gas is released from the exhaust hole into the atmosphere.

[0003] When the exhaust hole is provided in the rear hood, the exhaust hole is opened upward and rearward, and when the exhaust hole is provided in the counterweight, the exhaust hole is opened downward and rearward, and exhaust gas is discharged in each direction. Is done.

[0004] In the case of a small hydraulic excavator such as a backhoe, there is a case where it is desired to selectively set the exhaust direction to the upper rear or the lower rear depending on the work environment at the site.

[0005] For example, in order to prevent exhaust gas from being emitted toward trees, the exhaust gas is emitted rearward or rearward and upward. It is desired to discharge the exhaust gas upward and rearward so that the exhaust gas is not applied.

[0006] As a conventional technique for changing the emission direction of exhaust gas in accordance with the working environment, Japanese Utility Model Laid-Open Publication No.
No. 620, No. 62-16719, No. 4-11
What is shown in each gazette of 9326 is known.

In these prior art configurations, an exhaust pipe provided in a muffler is provided with an exhaust direction changing chamber having a switching means, and a plurality of exhaust paths or exhaust tail pipes having different openings are provided in the exhaust direction changing chamber. The exhaust gas discharged from the exhaust pipe is selectively discharged through a predetermined exhaust path or an exhaust tail pipe by switching the switching means.

[0008]

The switching of the emission direction of the exhaust gas is not performed so frequently, and is often maintained in a fixed emission direction for a long time during the working time in which the user is engaged. Therefore, during this time, the exhaust pipe on one side is shut off by the switching means, so that the switching means rusts due to the moisture contained in the exhaust gas, and the subsequent switching operation becomes difficult. There was a problem.

The present invention has been made in view of the above, and is directed to a work vehicle in which the direction of exhaust gas emission can be easily changed according to the work environment even after performing the same work for a long time. It is an object of the present invention to provide an exhaust device for an engine.

[0010]

According to the first aspect of the present invention, an upper structure such as a working machine, a driver's seat, an engine and a counterweight is mounted on a frame such as a revolving frame. In the installed work vehicle,
Mufflers attached to the engine are provided with exhaust tailpipe attachment pipes at two places on the lower side and the upper side that are capable of exhausting downwards and upwards of the upper structure, and lower and upper exhausts according to the exhaust direction. The tail tube is configured to be selectively fitted and attachable.

According to the present invention, the exhaust gas of the engine can be selectively discharged downward or upward depending on the working environment. This allows, for example,
When it is desired to prevent the effects of exhaust gas on workers working near the work vehicle, exhaust gas is emitted upwards, and when working between low trees, there is no need to release exhaust gas to these low trees. By discharging the exhaust gas upward, it is possible to prevent the influence of the exhaust gas on the worker and to prevent the low trees from being exposed to the exhaust gas and the exhaust heat. According to the invention, in particular, the lower and upper exhaust tail pipes can be selectively fitted and attached to the lower and upper exhaust tail pipe mounting pipes, so that the same operation can be performed for a long time. And, tentatively,
Even if the exhaust tail pipe mounting part rusts, it can be easily replaced, and the change of the exhaust gas emission direction can be changed even after the same operation has been performed for a long time. It can be easily done accordingly.

[0012] According to another aspect of the present invention, the above object is achieved.
The invention according to claim 1 is the invention according to claim 1,
According to the present invention, the upper exhaust tail pipe mounting pipe is closed with a closing plug member, and the lower exhaust tail pipe mounting pipe is attached to the lower exhaust tail pipe mounting pipe to exhaust downward. The unused exhaust tailpipe mounting pipe can be closed by simple means.

[0013] In order to achieve the above object, a third aspect of the present invention is provided.
The invention according to claim 1 is the invention according to claim 1,
A drain pipe for discharging water from the muffler is attached to the lower exhaust tail pipe mounting pipe, and an upper exhaust tail pipe is mounted to the upper exhaust tail pipe mounting pipe to exhaust air upward. Has become. According to this invention, the downward exhaust tail pipe mounting pipe can be diverted for draining water, and a new drain pipe is not required.

According to a fourth aspect of the present invention, the above object is achieved.
The invention according to claim 3 is the invention according to claim 3,
The distal end of the lower exhaust tail pipe is configured to be inserted into an exhaust hole provided in the counterweight. According to the present invention, when the lower exhaust tail pipe is attached to the muffler, the exhaust gas from the lower exhaust tail pipe can be released without polluting the counterweight.

According to another aspect of the present invention, there is provided a method for manufacturing a semiconductor device comprising:
The invention according to claim 3 is the invention according to claim 3,
The upper exhaust tailpipe is configured such that the distal end thereof faces an exhaust hole formed in the rear bonnet. According to the present invention, when the upper exhaust tail pipe is attached to the muffler, the exhaust gas from the upper exhaust tail pipe can be released without polluting the rear hood.

According to a sixth aspect of the present invention to achieve the above object, a window hole is provided in a portion of a rear bonnet where a tip of an exhaust tailpipe is opposed, and the upper exhaust hole is provided in the window hole. A window panel having an exhaust hole facing the distal end portion of the tail tube and another window panel not having the exhaust hole are interchangeably mounted. According to the present invention, when the upper exhaust tail pipe is attached to the upper exhaust tail pipe mounting pipe of the muffler, and in the case where the upper exhaust tail pipe is not attached, the window panel attached to the window hole of the rear hood has an exhaust hole, It can be replaced with one that does not have one, and unnecessary exhaust holes can be eliminated in the rear bonnet when the upper exhaust tail pipe is not attached, so that the appearance in this case is not spoiled.

[0017]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a small backhoe which is an example of a working vehicle in which the present invention is to be implemented. This backhoe is mounted on a crawler-type traveling device 1 on a turning frame 2.
Is mounted on a swing bracket 10 at the front end of the swing frame 2. The work machine 9 includes a boom 3, an arm 4, a bucket 5, and hydraulic cylinders 6, 7, 8 for raising and lowering them. It is provided so as to be able to swing in the left-right direction via.

On the revolving frame 2, a control device 11,
A driver's seat 12, an engine 13, and a canopy 14 are mounted. The engine 13 is surrounded by a partition wall 15 separating the driver's seat 12 and the engine 13, a rear bonnet 16, a counterweight 17, and the like.

Reference numeral 18 denotes a muffler for the engine 13. The muffler 18 has a cylindrical shape and is disposed above the engine 13 and substantially horizontally in the front-rear direction. This muffler 18 has two brackets 1 fixed to the engine body at two axial positions.
9 is held and fixed by a band-shaped fitting 20. A cylindrical exhaust tail pipe mounting pipe 21 having an open end is provided at two locations on the lower and upper sides of the rear end of the muffler 18.
22 is fixed.

Reference numeral 23 denotes a lower exhaust tail pipe attached to the lower exhaust tail pipe mounting pipe 21. The lower exhaust tail pipe 23 has a mounting end formed in a cylindrical shape with a slot. The cylindrical part is fitted to the lower exhaust tail pipe mounting pipe 21 and the slotted part is fastened with the tightening ring 25 so that it can be firmly attached to the lower exhaust tail pipe mounting pipe 21. I have. The tip of the lower exhaust tail pipe 23 is curved backward,
It is configured to be inserted into an exhaust hole 26 provided in the counterweight 17. The lower exhaust tail pipe 23 is detachably supported on the engine 13 side by a bracket 27. The tightening ring 25 is configured as shown in FIG. 3 and has an annular shape with a part cut off. The diameter of the tightening ring 25 is reduced by tightening the separated part with a bolt 25a.

Reference numeral 28 denotes a closing plug member attached to the upper exhaust tail pipe mounting pipe 22. The closing plug member 28 has a closed end, and a mounting portion with the upper exhaust tail pipe mounting pipe 22 is slotted. This cylindrical portion is fitted to the upper exhaust tail pipe mounting tube 22 to form a slotted portion with the tightening ring 2.
5, the upper exhaust tail pipe mounting pipe 22
It is designed to be attached firmly.

Reference numeral 29 denotes an upper exhaust tail pipe which is attached to the upper exhaust tail pipe mounting pipe 22 in place of the closing plug member 28. It has the same configuration as the section. The distal end of the upper exhaust tail pipe 29 is bent rearward to form the rear bonnet 1.
Window panel 3 which is detachably attached to a window hole 30 opened in the rear bonnet 16 which will be described later inside the hood 6.
1b. Although not shown, the upper exhaust tail pipe 29 is supported on the engine by a bracket or the like as necessary.

Reference numeral 32 denotes a drainage pipe attached to the lower exhaust tail pipe mounting pipe 21 instead of the lower exhaust tail pipe 23.
The drainage pipe 32 includes a mounting portion 32a that is mounted on the lower exhaust tail pipe mounting tube 21 and a drain portion 32b. The mounting portion of the drain pipe 32 has the same configuration as the mounting portion of the lower exhaust tail pipe 23. The drain portion 32b extends downward from the mounting portion 32a.

A window hole 30 is provided in the rear bonnet 16 at a position where the tip of the upper exhaust tail pipe 29 is opposed, and two kinds of window panels 31a and 31b are detachably attached to the window hole 30. Has become.

One of the window panels 31a is the rear bonnet 1
6 has a ventilation hole 35 in the shape of a long hole similar to the ventilation hole provided in the second exhaust panel 6. In addition to the ventilation hole 35, the tip of the upper exhaust tail pipe 29 faces the other window panel 31b. Exhaust holes 36 are provided.

Each of the panels 31a and 31b is provided with a plurality of mounting pieces 37 around its periphery. Each of the mounting pieces 37 is fixed to a mounting portion 38 provided on the inner edge of the window hole 30 of the rear bonnet 16 with screws 39. As a result, the rear bonnet 16 is fixed from the inside.

The rear bonnet 16 can be opened and closed by using the upper part of the rear bonnet 16 as a pivot.

In the above construction, the exhaust tail pipes 21 and 22 provided on the lower and upper sides of the muffler 18 are selectively disposed on the lower or upper exhaust tail pipes 23 and 29 according to the work site.
Is attached.

That is, when it is not desired to discharge the exhaust gas upward, the lower exhaust tail pipe 23 is connected to the lower exhaust tail pipe mounting pipe 21 of the muffler 18. In this case, a closing plug member 28 is attached to the upper exhaust tail pipe mounting pipe 22, and the upper exhaust tail pipe mounting pipe 22 is closed. In this case, one window panel 31a provided with only the ventilation hole 35 is attached to the window hole 30 of the rear hood 16 in this case.

In this state of use, the exhaust from the muffler 18 is discharged rearward and downward from the exhaust hole 26 of the counterweight 17 through the lower exhaust tail pipe 23. At this time, the water collected in the muffler 18 is removed from the lower exhaust tail pipe mounting pipe 21.
The exhaust gas is discharged from the lower exhaust tail pipe 23 together with the exhaust gas.

If it is not desired to discharge the exhaust gas backward and downward, the upper exhaust tail pipe 29 is attached to the upper exhaust tail pipe mounting pipe 22 of the muffler 18. In this case, a drainage pipe 32 is attached to the lower exhaust tail pipe attachment pipe 21.
In this case, the other window panel 31b having the exhaust hole 36 is attached to the window hole 30 of the rear bonnet 16.

In this state of use, the exhaust from the muffler 18 is discharged rearward and upward from the exhaust window 36 of the window panel 31b of the rear hood 16 through the upper exhaust tail pipe 29. At this time, the water accumulated in the muffler 18 is discharged from the lower exhaust tail pipe mounting pipe 21 through the drain pipe 32.

The replacement of the exhaust tail pipes 23 and 29, the closure plug member 28, and the drainage pipe 32 is performed by opening the rear bonnet 16.

[Brief description of the drawings]

FIG. 1 is a side view schematically showing a small backhoe to which the present invention is applied.

FIG. 2 is a side view showing a case where a lower exhaust tail pipe is used.

FIG. 3 is an exploded perspective view showing a mounting portion of the exhaust tail pipe.

FIG. 4 is a rear view showing a case where a lower exhaust tail pipe is used.

FIG. 5 is a side view showing a case where an upper exhaust tail pipe is used.

FIG. 6 is a front view showing a window panel having an exhaust window.

FIG. 7 is a sectional view taken along the line AA of FIG. 6;

FIG. 8 is a front view showing a window panel without an exhaust window.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Traveling device 2 ... Revolving frame 3 ... Boom 4 ... Arm 5 ... Bucket 6, 7, 8 ... Hydraulic cylinder 9 ... Work implement 10 ... Swing bracket 11 ... Steering device 12 ... Driver seat 13 ... Engine 14 ... Canopy 15 ... Partition wall DESCRIPTION OF SYMBOLS 16 ... Rear bonnet 17 ... Counterweight 18 ... Muffler 19, 27 ... Bracket 20 ... Hardware 21, 22 ... Exhaust tail pipe mounting pipe 23, 29 ... Exhaust tail pipe 25 ... Tightening ring 25a ... Bolt 26, 36 ... Exhaust hole 28 ... closure plug member 30 ... window hole 31a, 31b ... window panel 32 ... drainage pipe 32 ... mounting part 32b ... drain part 37 ... mounting piece 38 ... mounting part

Claims (6)

[Claims] 1. A work vehicle in which an upper structure such as a work machine (9), a driver's seat (12), an engine (13), and a counterweight (17) is mounted on a frame such as a turning frame (2). The muffler (18) attached to 13) is provided with exhaust tail pipe attachment pipes (21, 22) at two locations on the lower side and the upper side, which are capable of exhausting downward and upward in the upper structure, and exhaust direction. Lower and upper exhaust tailpipe (23, 29) depending on
An exhaust device for an engine in a work vehicle, wherein the exhaust device is selectively fitted and attachable. 2. An upper exhaust tail pipe mounting pipe (22) is closed with a closing plug member (28), and a lower exhaust tail pipe (23) is attached to a lower exhaust tail pipe mounting pipe (21). The exhaust device for an engine in a work vehicle according to claim 1, wherein the exhaust gas is exhausted to a work vehicle. 3. A drain pipe (32) for discharging water entering the muffler (18) is attached to the lower exhaust tail pipe mounting pipe (21), and an upper drain tail pipe mounting pipe (22) is attached to the upper exhaust tail pipe mounting pipe (22). 2. An exhaust system for an engine in a work vehicle according to claim 1, wherein said exhaust tail pipe (29) is attached to exhaust air upward. 4. The engine of a work vehicle according to claim 2, wherein the tip of the lower exhaust tail pipe (23) is inserted through an exhaust hole (26) provided in the counterweight (17). Exhaust device. 5. The engine of a work vehicle according to claim 3, wherein a tip end of the upper exhaust tail pipe (29) faces an exhaust hole (36) formed in the rear bonnet (16). Exhaust device. 6. A window hole (30) is provided at a portion of the exhaust tailpipe (29) on the upper side of the rear bonnet (16) facing the tip end, and the window hole (30) is provided with the upper exhaust tailpipe (29). 29)
A window panel (33b) having an exhaust hole (36) whose tip end faces the other, and another window panel (33a) not having the exhaust hole (36) is exchangeably mounted. An exhaust device for an engine in a work vehicle according to claim 1.