JPH0133785Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention is a soundproof engine operation system in which an engine and work equipment such as a generator and a compressor that are operated using the engine as a power source are housed in a soundproof case. It's about machines.

Prior Art Engine working machines that integrate an engine and a generator, compressor, etc. driven by the engine are generally used at construction sites, etc.
In order to keep operating noise as low as possible, in consideration of the working environment or the local community especially when driving at night in urban areas, many devices are used that have a soundproof structure in which the entire device is covered with a soundproof case.

In order to pursue quietness as mentioned above, this type of soundproof engine working machine has the openings such as intake ports and exhaust ports as small as possible and is made small, but on the other hand, because the opening area is small, Sufficient consideration must be given to the cooling inside the soundproof case, and especially for air-cooled types that do not use cooling water, there are difficulties in the arrangement of heat generating equipment such as the engine and muffler with other equipment and the cooling system. .

Conventionally, in portable engines in which the engine body and associated muffler etc. are housed in a single housing for easy portability, a duct is provided to cover the cylinder head and muffler of the engine, and cooling air is pumped through the duct by a fan. Japanese Utility Model Publication No. 44-3686 discloses a system in which the engine and muffler are cooled by forced ventilation, and the heat effect on other equipment is removed.

Problems to be Solved by the Invention However, the device described in the above publication has a relatively small engine housed in the housing, or soundproof case, but the soundproof engine uses a relatively large engine. Work equipment, e.g. output 2kw to 6kw
In soundproof engine generators, etc., the muffler and duct become large and particularly long, and the support structure of the muffler and duct becomes a problem, or measures against vibration of the muffler and duct due to engine operating vibration are required. .

Means and operation for solving the problem Therefore, the present invention provides a soundproof engine working machine in which an engine and a working machine driven by the engine are housed in a soundproof case with their rotating shafts directly connected. , the engine and the work machine are supported in a soundproof case via a vibration isolating member, a first duct part that covers a cylinder part of the engine that is attached to the engine, and a second duct part that is attached to the soundproof case and covers a muffler. A duct is provided which is connected to the duct part via an elastic sealing member, and a cooling fan is provided for forcing cooling air into the duct, and the muffler is connected to the second duct part by a support arm passing through the second duct part. It is supported on the working machine.

In the present invention, the engine and the work machine are directly connected and constitute the same vibration unit that is vibrationally separated from the soundproof case by the vibration isolating member.Using this, the muffler is connected to the work machine by the support arm. By fixing the muffler to the same vibration as the engine, the muffler can be made to vibrate in the same way as the engine. Therefore, even if the muffler becomes large, it can be securely fixed to the engine.

In addition, the duct is divided into a first duct part and a second duct part, which are fixed to the engine and soundproof case respectively, so even if the duct is large as a whole, it can be securely fixed and supported. The side of the duct that covers the engine has the same vibration control as the engine, but the side that covers the muffler has a different vibration control, which eliminates the large vibrations that occur in ducts that are directly connected to each other.

Moreover, since the first and second duct parts are joined via an elastic sealing member, the cooling air forced by the cooling fan will not leak out of the duct, and the heat source equipment consisting of the engine and muffler will not be able to escape. It is completely isolated from other equipment, and these heat source equipment can be centrally cooled, resulting in extremely high cooling efficiency.

Embodiment Hereinafter, the present invention will be described with reference to an embodiment shown in the drawings.

FIG. 1 is a perspective view showing the appearance of a soundproof engine working machine according to the present invention. As shown in the figure, the exterior of this engine working machine is covered with a soundproof case 1, and the engine, the working machine (in this embodiment, a generator), and associated equipment are housed inside. The inner surface of the soundproof case 1 is lined with a soundproofing material such as glass wool to prevent noise generated by internal devices from leaking to the outside.

The soundproof case 1 includes a bottom part 2 and a main cover 3 fixed with bolts or the like along the side edges of the bottom part 2.
and a side cover 4 that covers both end surfaces of the main cover 3, and a handle 5 is fixed to the upper part of the side cover 4. Two hollow leg members 6, 6 made of channel material are provided on the lower surface of the bottom 2 along the longitudinal direction of the soundproof case 1, and four movable legs 6, 6 are provided on the outer side of these leg members 6, 6. A wheel 7 is rotatably supported.

Fig. 2 shows the bottom part 2 with the main cover 3 and side cover 4 removed. A bottom plate 8 having flange portions 2a, 2a and flange portions 2b, 2b for attaching the side cover 4 upright;
As mentioned above, a pair of hollow leg members 6, 6 are integrally provided on the lower surface of the bottom plate 8. The hollow portion of each leg member 6 communicates with the inside of the soundproof case via air intake ports 9, 9... formed in the bottom plate 8, and at least one end of each leg member 6 is open to the outside. are doing. Mounting plates 10 are attached to the inner surface of the bottom plate 8 between both edges thereof, and devices such as an engine and a generator are attached to the bottom 2 via these mounting plates 10. The engine is installed in the area surrounded by the chain line A in the figure, with the cylinder section tilted to the left in the figure and the output shaft placed on the right side.The engine is directly connected to this output shaft and the generator is connected to the chain line B.
Install it in the section. Due to this arrangement, the muffler is placed in the vacant space C on the chain line.

In FIG. 2, the air flow is also indicated by arrows, and external air enters the hollow part of the leg member 6 through the opening 11 of the leg member 6, and from the hollow part, the air inlets 9, 9, . . . Enter the soundproof case through... A part of the combustion air is taken into the engine cylinder, and the exhaust gas is discharged to the outside through the muffler.
The other part is guided into the engine cover by a fan attached to the engine, flows through a duct connected to the engine cover and extends to cover the outside of the engine and muffler, cools the engine and muffler, and then cools the engine and muffler. It is discharged along with the The bottom plate 8 is further provided with another intake port 12, and the air introduced from this intake port 12 cools the generator and then joins the air in the duct.

Next, the engine, generator, muffler, duct, etc. will be explained in more detail with reference to FIGS. 3 to 5. FIG. 3 is an end view of the interior of the soundproof case 1 viewed from the engine side, with a portion shown in cross section. FIG. 4 is a similar front view, and FIG. 5 is a top view. As shown in FIG. 3, the engine 13 is attached to the mounting plate 10 with the cylinder 14 tilted to the left via a vibration isolating member, ie, a rubber outing 15. At the top of the engine 13, whose height has been reduced by tilting it in this way, there is a fuel tank 16.
is fixed with bolts 18 on a support plate 17 spanning between both side plates of the main cover 3.

The engine 13 is covered with an engine cover 19, and a cooling fan 20 (FIG. 4) is also provided inside the engine cover 19. The cooling fan 20 cools the engine 13 by flowing air sucked in from an intake port 21 provided at the front end of the engine cover 19 to the outside of the engine 13. Combustion air is drawn into the cylinder via an air cleaner 22 and a carburetor 23.

The generator 24 is directly connected to the output shaft of the engine 13, and as described above, the engine 13 has the cylinder 14 on the left side (the left side when viewed from the end face on the engine side).
The same applies hereafter)), so
The output shaft is offset to the right with respect to the centerline of the soundproof case, so the generator 24 is located on the right as shown in FIG. 5 and as described above with respect to FIG. This generator 24 also has a vibration isolating member, that is, a rubber mount 25, as shown in FIG.
It is attached to the mounting plate 10 via the engine 13, and has the same vibration relationship as the engine 13. A muffler 26 is housed in the space created on the left side of the generator 24.
The engine exhaust enters the exhaust chamber 28 of the muffler 26 through the exhaust pipe 27, and then enters the exhaust chamber 28 in the rear upper part.
The air is discharged from a through an exhaust port 29 provided in the rear side cover 4 to the outside.

The muffler 26 includes a muffler duct 30 (a second
The inner end of the muffler duct 30 is connected to a shroud 32 (first duct part) via an elastic seal member 31,
The shroud 32 extends toward the engine 13 and is fixed to the engine 13, covers the cylinder 14, and communicates with the inside of the engine cover 19. In this way, the engine cover 19, shroud 32, and muffler duct 30 form a duct from the intake port 21 to the exhaust port 29, and the heat released from the engine 13 and the muffler 26 into the soundproof case is channeled through the duct by the cooling fan 20. Since it is absorbed by the flowing cooling air and discharged to the outside from the exhaust port 29, it is possible to effectively prevent the temperature inside the case from rising.

As shown in FIGS. 6 and 7, the muffler duct 30 is divided into two parts, an upper member 30a and a lower member 30b.
A muffler duct 30 with a rectangular cross section surrounding the muffler 26 is formed by combining the muffler 26. The muffler duct 30 is attached to the soundproof case by fixing the upper member 30a to the side wall of the main cover 3 via the flange 33, and fixing the lower member 30b to the bottom plate 8 of the bottom part 2 via the stay 34. Note that the muffler duct 30 may be formed integrally with the soundproof case. Reference numeral 35 denotes a heat and sound insulating material made of glass wool or the like and lined on the inner surface of the muffler duct 30.

A through hole 36 is provided in the side wall of the lower member 30b, and a support arm 37 fixed to the side surface of the muffler 26 passes through this through hole 36 and protrudes outward, so that it can be attached to a mounting bracket provided on the generator 24. 3
8 with bolts 39. That is, the muffler 26 connects to the generator 24 via the support arm 37.
The muffler duct 30 is fixedly supported, is vibrationally integrated with the engine 13, and is separated from the muffler duct 30. Since the through hole 36 around the support arm 37 is covered and sealed with the heat/sound insulating material 35, the cooling air flowing inside the muffler duct 30 does not leak outward from the through hole 36.

The shroud 32 is also divided into an upper member 32a and a lower member 32b as shown in FIG.
A and 32b are combined to form a shroud 32 that covers the cylinder portion of the engine 13, as shown in FIGS. 3 to 5. This Shroud 3
2 is fixed to the engine 13 as described above and communicates with the inside of the engine cover 19. The muffler duct 30 side of the shroud 32 is connected to the muffler duct 30 via the elastic seal member 31 as described above, and the shroud 32 fixed to the engine 13 and the muffler duct 30 fixed to the soundproof case 1 are separated from each other in vibration. Since the long duct consisting of the muffler duct 30 and the shroud 32 vibrates as one, large vibrations do not occur. Moreover, the cooling air in the duct does not leak to the outside from the joint between the shroud 32 and the muffler duct 30.

Effects of the invention As described above, according to the invention, the muffler can be reliably fixed so that it is in the same vibration relationship as the engine.

In addition, the duct is divided into two parts, the first duct part and the second duct part, and each is fixed to the engine and soundproof case, so even large ducts can be securely supported, and the duct can be damaged by vibrations. It doesn't seem like there will be any big swings.

Moreover, since the first and second duct parts are joined via an elastic sealing member, cooling air does not leak out of the duct, and the engine and muffler are completely thermally isolated from other equipment. Since the cooling is performed intensively, the cooling efficiency is extremely high.

[Brief explanation of the drawing]

Fig. 1 is an external perspective view of the soundproof engine working machine according to the present invention, Fig. 2 is a perspective view of the bottom of the soundproof case, Fig. 3 is an end view partially showing the interior in cross section, and Fig. 4 is a front view of the same. Figure 5 is a top view of the same, Figure 6 is a cross-sectional view of the second duct part, Figure 7 is an exploded perspective view showing the second duct part and muffler, and Figure 8 is an exploded view of the first duct part. FIG. 1...Soundproof case, 2...Bottom, 3...Main cover, 4...Side cover, 5...Handle,
6... Leg member, 7... Wheel, 8... Bottom plate, 9...
Intake port, 10... Mounting plate, 11... Opening, 12
... Intake port, 13 ... Engine, 14 ... Cylinder, 15 ... Rubber mount (vibration isolating member), 16
... Fuel tank, 17 ... Support plate, 18 ... Bolt, 19 ... Engine cover, 20 ... Cooling fan, 21 ... Suction port, 22 ... Air cleaner, 2
3... Carburetor, 24... Generator, 25...
Rubber mount (vibration isolation member), 26... muffler,
27... Exhaust pipe, 28... Exhaust chamber, 29... Exhaust port, 30... Muffler duct (second duct part),
31... Elastic seal member, 32... Shroud (first duct portion), 33... Flange, 34...
...Stay, 35...Heat and sound insulation material, 36...Through hole, 37...Support arm, 38...Mounting bracket, 39...Bolt.

Claims (1)

[Scope of utility model registration request] In a soundproof engine working machine in which an engine and a working machine driven by the engine are housed in a soundproof case with their respective rotating shafts directly connected, the engine and the work machine are supported in the soundproof case via a vibration isolating member, A duct is provided in which a first duct part that is attached to the engine and covers a cylinder part of the engine and a second duct part that is attached to the soundproof case and covers a muffler are joined via an elastic sealing member. A soundproof engine working machine, characterized in that a cooling fan for forcing cooling air through the duct is provided, and the muffler is supported on the working machine by a support arm passing through the second duct part.