JPS6233062Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an exhaust soundproof duct provided in a construction machine or other power working machine.

Generally, in a power working machine equipped with an engine, the engine, a radiator facing the engine, and a radiator fan are covered with an engine cover, and an exhaust port is formed on the engine cover at a position facing the radiator fan, Cooling exhaust air is released from this exhaust port,
This structure has the drawback that the noise accompanying the exhaust gas escapes directly to the outside, generating large noise around the working machine. Therefore, in order to eliminate such drawbacks, a soundproof duct is provided that communicates with the exhaust port of the engine cover, but this soundproof duct is an integral structure with the engine cover, and therefore, it cannot be used with a normal radiator. In order to attach the grille to a standard working machine that has been attached to the exhaust port, the entire engine cover must be warped and replaced, which has the drawback of high modification costs. In addition, such exhaust ports are usually provided at the rear of the work equipment or at both rear ends, and in that case, if a soundproof duct is installed, the vehicle body will not protrude to the rear or rear side by that much. This is unavoidable, and as a result, in a full swing type work machine, the soundproof duct may hit an obstacle and be deformed or damaged during the swing. In such a case, the conventional structure requires replacing the entire engine cover or removing the engine cover for repair, which is disadvantageous in that it is costly and takes time to repair.

The present invention was created in view of these conventional drawbacks, and can be easily installed at low cost even on standard working machines that do not have soundproof ducts.
Even if the soundproof duct is damaged, there is no need to replace the entire engine cover, and its configuration will be explained below based on the drawings showing one embodiment.

Figure 1 shows the entire working machine to which the soundproof duct of the present invention is installed.
The lower traveling vehicle body 3 is an upper rotating vehicle body that is rotatably attached to the upper part of the lower traveling vehicle body 1, and the upper rotating vehicle body 3 has a driver's seat 4 on the upper part thereof. At the rear of the engine cover 5
An engine 6 covered by a hood is disposed, and an excavator 7 is further provided at the front end of the upper swing vehicle body 3. 8
is a soundproof duct of the present invention attached to the rear wall surface of the engine cover 5, and 9 is a bumper that protects this soundproof duct 8.

2 and below, inside the engine cover 5, a radiator 11 is installed behind the radiator fan 10, facing the radiator fan 10 installed at the rear of the engine 6. An exhaust port 12 is opened on the rear wall surface. On the other hand, the box-shaped soundproof duct 8 is installed so as to cover the exhaust port 12, but an exhaust pipe that fits the exhaust port 12 is provided on the front wall surface 8a facing the exhaust port 12. The inlet 13 is open, and a sound absorbing material 14 is attached to the wall surface 8b on the rear side facing the exhaust inlet 13, so that the exhaust gas that enters the soundproof duct 8 from the exhaust inlet 13, It is made to collide with the sound absorbing material 14. As can be seen in FIG. 3, the exhaust intake port 13 and the sound absorbing material 14 are formed in the right half of the soundproof duct 8 in the left-right direction.
An exhaust outlet 15 is formed in the rear wall portion 8b of the left half of the soundproof duct which does not have such a sound absorbing material 14.
As a result, the exhaust intake port 13 and the exhaust port 15 are formed at positions shifted from each other in the left-right direction.
Reference numeral 16 denotes a mounting plate fixed to the outside of the front wall 8a of the soundproof duct 8, and a plurality of screw holes 17 are formed at required locations on the mounting plate 16 and the front wall 8a. In this embodiment, screw holes 18 are formed in the rear wall portion 5a of the engine cover 5 so as to fit with each other. By removing this screw 19, the soundproof duct 8 can be removed from the engine cover 5. 20 is as shown in Figure 3,
Both ends 21a, 21a of the laterally long plate-like main body 21
This bumper is for a soundproof duct and has an inverted L-shaped cross section with a mounting plate 22 that is tilted slightly upwardly and is also fixed perpendicular to the lower surface of the plate-like main body 21, and the mounting plate 22 is attached to the rear surface of the standard bumper 23 below the engine cover 5. fart,
It is fixed with bolts 24. At that time, the plate-like body 2
1 protrudes slightly rearward from below the soundproof duct 5, and both inclined ends of the plate-like body 21 cover the lower side surfaces of the soundproof duct 5, thereby preventing obstacles from hitting the soundproof duct 8. Prevents deformation or damage. In addition, 25 shown in FIG.
Another outlet formed on the side of the soundproof duct 8 is shown. These outlet ports 15 and 25 are provided offset from the intake port 13,
Therefore, it may be provided on the upper wall of the soundproof duct 8 or at other locations. Further, the sound absorbing material 14 may also be attached to other locations on the inner wall of the soundproof duct 8.

On the other hand, FIG. 4 shows a case where a standard radiator grille 26 is installed in place of the soundproof duct 8, and the radiator grille 26 has the same external shape as the mounting plate 16 for the soundproof duct 8, and there are , a screw hole 27 that matches the screw hole 18 of the engine cover 5 is formed, and this screw hole 2
7 and is removably attached to the engine cover 5 with the same screws 19 as described above.

That is, in this embodiment, the radiator grill 26 and the soundproof duct 8 are both removable independently from the engine cover 5, and can be attached and replaced with each other using the screw holes 18 provided in the engine cover 5. be. Therefore, in order to change a work machine equipped with a standard radiator grille 26 to one with a soundproof duct 8, it is sufficient to remove only the radiator grille 26 and install the soundproof duct 8. Improvements can be made at low cost, and even if the soundproof duct 8 is deformed or damaged, only the soundproof duct 8 can be replaced.

As described above, according to the present invention, the standard radiator grill and the soundproof duct can be replaced with each other, so it is possible to convert a standard work machine with a radiator grill attached to a low-noise work machine with a soundproof duct. , there is an effect that can be easily obtained by replacing and installing the radiator grille and soundproof duct without replacing the entire engine cover. In addition, in the present invention, the soundproof duct can be removed independently from the engine cover, so even if the soundproof duct becomes deformed or damaged, the entire engine cover can be removed and repaired, or the entire engine cover can be replaced. It can be easily repaired by attaching and removing only the soundproof duct without having to do anything, and the repair cost is low.Although the work cannot be done if the entire engine cover is removed, the work can be done even with only the soundproof duct removed. Since this is possible, the work can be carried out even during repair.

[Brief explanation of the drawing]

Figure 1 is an overall side view of a power working machine equipped with the soundproof duct of the present invention, Figure 2 is a vertical sectional view of the soundproof duct installation part, Figure 3 is an exploded perspective view of the same, and Figure 4 is a standard radiator. FIG. 3 is an exploded perspective view showing the mounting structure of the grill. 5...Engine cover, 8...Soundproof duct, 1
0...Radiator fan, 13...Exhaust intake,
15, 25...Exhaust outlet, 26...Radiator grill.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. A soundproof duct having an exhaust inlet and an exhaust outlet, the exhaust inlet being connected to an exhaust outlet of a radiator fan, the duct being removably attached to an engine cover, and also connected to an engine cover. A soundproof duct for a power working machine characterized by a radiator grille that can be freely attached to and detached from the cover and that can be replaced and attached. 2 Utility model registration claim No. 1 in which a protection member for the soundproof duct is provided on the outside of the outer wall of the soundproof duct
Soundproof ducts for power working machines as described in section.