JPH10266853A - Engine exhaust structure of construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the damage of a building present near the rear of a construction machine in an exhaust structure for guiding exhaust gas into a small chamber provided within a counter weight and discharging it into the atmosphere through the discharge port of the small chamber by providing the discharge port of the small chamber downward or obliquely downward. SOLUTION: A small chamber 12 is formed within a counter weight 11 fixed to the rear part of a construction machine body, and the tip of an exhaust pipe 16 is inserted to the inlet 14 of the small chamber 12. A plurality of discharge ports 13 are provided on the bottom part of the small chamber 12, and the discharge ports 13 are formed so that the opening area is increased as the distance from the center of the inlet 14 is increased. The opening area may be formed so that the diameter is increased, for example, in proportion to the distance, or the flow rate of the exhaust gas discharged from each discharge port 13 is substantially equal to each other. Thus, the exhaust gas is dispersively released toward the ground, so that a construction work can be performed without damaging a fence near the rear of the construction machine.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field of an exhaust structure of an engine mounted on a construction machine such as a hydraulic shovel.

[0002]

2. Description of the Related Art Exhaust gas from an engine of an automobile or the like is silenced by a muffler and discharged directly into the atmosphere from an exhaust pipe. However, after the exhaust gas of the engine installed on the construction machine passes through the muffler, it is not released directly to the atmosphere from the exhaust pipe, but a small chamber is provided in the counterweight attached to the construction machine, and the exhaust gas from the exhaust pipe is Is introduced into the small chamber and discharged from the exhaust port of the small chamber.

[0003] One of the purposes of the exhaust chamber is to mitigate damage from exhaust gases. That is, if the exhaust gas is directly discharged from the exhaust pipe, the construction machine, unlike an automobile or the like, moves less, and damage due to the exhaust gas is concentrated. Therefore, the exhaust gas from the exhaust pipe is guided to the small chamber to diffuse the flow direction, thereby reducing the discharge speed even slightly. One of the other purposes is to use as a counterweight radiator to lower the temperature of exhaust gas.

As an engine exhaust structure used in a conventional construction machine, for example, Japanese Utility Model Publication No. Hei 2-145 is disclosed.
No. 620. This is shown in FIGS. 4 and 5, an engine 2 is mounted on the rear part of the body 1 of the wheel loader, and a counterweight 4 made of cast iron is connected to the rear part of the body 1 by bolts corresponding to the loader device 3 on the front part of the body. Have been. The counterweight 4 is formed with a through hole 5 extending over the front and rear surfaces.

[0005] The through-hole 5 leads out the engine exhaust to the outside of the machine, and an exhaust pipe 7 derived from the muffler 6 of the engine projects from the body 1 and is disposed deep inside the through-hole 5. Through-hole 5 is counterweight 4
Is formed in a tapered shape so that the radius becomes smaller toward the outside. A gap 8 is provided between the counterweight and the body 1.

The engine exhaust gas discharged from the exhaust pipe 7 is released to the atmosphere from the through hole 5 toward the rear. Also,
The soot in the exhaust gas adhering to the inner surface of the through hole 5 is released to the ground from the gap 8 together with the moisture and oil contained in the exhaust gas.

[0007]

In the engine exhaust structure of the above-mentioned conventional apparatus, soot and the like in the exhaust gas are discharged to the ground through a gap, but the exhaust gas is discharged backward. Moreover, the heat radiation effect and the speed reduction effect of the counterweight are not so large. Therefore, the exhaust gas discharged from the exhaust port has a high temperature and the discharge speed is considerably high. Therefore, for example, if there is a fence or a building near the rear of the construction machine, the exhaust gas causes enormous damage. For this reason, the work has to be performed at a certain distance or provided with a shield such as a plywood, so that the work is complicated, and the work of the construction machine in a narrow place is restricted.

The present invention has been made in view of the above background, and has as its object to provide an engine exhaust structure of a construction machine which is less damaged even when a building or the like is near the back of the construction machine.

[0009]

According to a first aspect of the present invention, there is provided an engine exhaust structure for a construction machine, wherein exhaust gas discharged from an exhaust pipe of an engine of the construction machine is provided inside a counterweight. In an exhaust structure for guiding into a small chamber and discharging the air into the atmosphere from an exhaust port of the small chamber, the exhaust port of the small chamber is provided in a downward direction or an obliquely downward direction. According to the above configuration, the engine exhaust gas is guided toward the ground after being guided into the small room.

According to a second aspect of the present invention, in the engine exhaust structure according to the first aspect, a plurality of exhaust ports are provided as exhaust ports, and the opening area of each exhaust port increases as the distance from the central axis of the exhaust pipe increases. It is characterized by doing.
With the above configuration, the exhaust gas emitted toward the ground is emitted from the plurality of exhaust ports, and the more distant the exhaust ports are, the larger the opening area becomes, so that the exhaust gas is uniformly dispersed. It is possible.

Further, in the engine exhaust structure according to the third aspect, in the structure of the first or second aspect, a seal for preventing exhaust gas in the small chamber from flowing back toward the engine is provided near the inlet of the small chamber. It is characterized by:

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a side sectional view of a main part of an embodiment of the present invention. FIG. 2 is a cross-sectional view as viewed from the arrow AA in FIG.

In FIG. 1 and FIG.
As described in the conventional example, is fixed to the rear part of the construction machine main body (not shown) by bolts or other means such as fitting. A small chamber 12 is formed inside the counterweight 11, and an inlet 14 is provided on the engine side of the small chamber so that the tip of the exhaust pipe can be inserted. Further, a plurality of exhaust ports 13 for discharging exhaust gas of the engine are provided at the bottom of the small chamber 12. The counterweight 11 is formed of cast iron or the like. Although not shown, fins may be provided on the outer surface of the counterweight to enhance the heat radiation effect.

The plurality of exhaust ports 13 are formed such that the opening area increases as the distance from the center of the inlet 14 increases. The opening area may be formed, for example, so that the diameter increases in proportion to the distance, or may be formed so that the flow rates of the exhaust gas discharged from the respective exhaust ports are substantially equal. Further, although the exhaust port 13 is formed downward (see FIG. 1), it may be formed obliquely rearward and downward as shown in FIG.

An exhaust pipe from the engine is disposed at the inlet 14 with a muffler (not shown) interposed therebetween such that the distal end of the exhaust pipe 16 projects horizontally into the small chamber 12.
The distal end of the exhaust pipe 16 may be disposed so as to be substantially directly above the exhaust port 13, or may be moved back and forth to be disposed at a biased position. The inlet 14 is provided with a seal 17 for preventing exhaust gas from flowing back to the engine side.

The present embodiment is configured as described above, and the exhaust gas discharged from the engine passes through the muffler from the exhaust pipe 16 to the small chamber 1 provided in the counterweight 11.
2 and are dispersed and discharged from the plurality of exhaust ports 13 toward the ground.

In the present embodiment, the exhaust gas from the engine is dispersed toward the ground and discharged by the above-described configuration and operation. Therefore, even in a relatively narrow place or a place where a fence or the like exists near the back of the construction machine, the present embodiment can be used. There is an effect that construction work becomes possible with less damage. Furthermore, the exhaust port is provided downward, soot and moisture contained in the exhaust gas,
Since oil and the like are discharged from the exhaust port, there is no need to provide a dedicated exhaust port, and there is an effect that the structure becomes simpler than the conventional structure.

Although the embodiments and examples of the present invention have been described in detail with reference to the drawings, the specific configuration is not limited to this example, and the design can be changed within a range not departing from the gist of the present invention. The present invention is included in the present invention.

[0019]

As described above, according to the structure of the present invention, the exhaust gas from the engine is dispersed and discharged toward the ground, so that a fence or the like is formed in a relatively narrow place or near the back of the construction machine. There is an effect that construction work becomes possible with little damage even in a place where it exists. In addition, the exhaust port is provided downward, soot, moisture, oil, etc. contained in the exhaust gas are discharged from the exhaust port, so there is no need to provide a dedicated exhaust port, and the structure is compared to the conventional structure This has the effect of being simpler.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a main part of an embodiment of the present invention.

FIG. 2 is a cross-sectional view as viewed from an arrow AA in FIG.

FIG. 3 is a side sectional view of a main part of a modification of the embodiment of the present invention.

FIG. 4 shows an example in which a conventional engine exhaust structure is used for a wheel loader.

FIG. 5 shows a side view of a main part of a conventional exhaust structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Counter weight 12 Small chamber 13 Exhaust port 14 Small chamber inlet 16 Exhaust pipe 17 Seal

Claims (3)

[Claims] 1. An exhaust structure for guiding exhaust gas emitted from an exhaust pipe of an engine of a construction machine into a small chamber provided inside a counterweight and discharging the exhaust gas into the atmosphere from an exhaust port of the small chamber. An engine exhaust structure for a construction machine, wherein the mouth is provided in a downward direction or an obliquely downward direction. 2. The engine exhaust structure for a construction machine according to claim 1, wherein a plurality of the exhaust ports are provided, and an opening area of each of the exhaust ports increases as the distance from the central axis of the exhaust pipe increases. 3. The small chamber according to claim 1, wherein a seal is provided near an inlet of the small chamber to prevent exhaust gas in the small chamber from flowing back toward an engine. Engine exhaust structure of construction machinery.