JPH0238035Y2 - - 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, but they are also used in working environments or in local communities when operating in urban areas, especially at night. Considering this, in order to keep operating noise as low as possible, many devices are used that have a soundproof structure in which the entire device is covered with a soundproof case.

In this type of soundproof engine working machine, openings such as intake ports and exhaust ports are made as small and as small as possible in order to pursue quietness as described above.
On the other hand, due to the small opening area, sufficient consideration must be given to cooling the inside of the soundproof case, especially for air-cooled types that do not use cooling water. We are having trouble with the layout of the equipment and the cooling system.

For this reason, conventionally, a cooling fan powered by an engine is provided inside the soundproof case, and the cooling fan is used to forcefully circulate cooling air.
For example, such an engine working machine is shown in Japanese Patent Publication No. 56-44255, but in this engine working machine, an air supply passage and an exhaust passage that communicate with outside air are directly connected to the engine working machine room of the soundproof case. If this is done, the noise inside the engine working machine will directly go outside through the air supply and exhaust channels, so the air supply and exhaust channels should be bypassed inside the soundproof case and the outside air intake and The exhaust vents are placed far away from the engine working equipment room to suppress the noise inside the engine working equipment room from going outside as much as possible.

Problems that the invention aims to solve However, even if it is possible to prevent noise from going outside by simply forming a detoured cooling air path, as in the conventional example above, the flow of cooling air is reduced due to increased ventilation resistance. Because of this, especially in air-cooled types, hot air tends to accumulate locally within the soundproof case. Furthermore, the structure for forming the detour tends to become complicated.

Means and Effects for Solving the Problems The present invention has been made in view of the above circumstances, and in this invention, an engine and a working machine driven by the engine are arranged side by side in the direction of the rotation axis. , in a soundproof engine working machine that is housed in a soundproof case, the work machine is provided with a fan for cooling the work machine, the engine is provided with a fan for cooling the engine, and a fan cover is provided to cover the engine cooling fan, A duct that covers the cylinder portion and the exhaust muffler of the engine and opens to the outside of the soundproof case at the end thereof is in communication with an oil cooling air passage provided along the oil pan portion of the engine, and is connected to the duct. The cooling exhaust air from the fan for cooling the working machine is merged, and the bottom of the soundproof case is
The case bottom plate and the lower bottom plate below form a double bottom having a duct-like space with both ends in the direction of the rotation axis open to the outside, and the duct-like space is operated at the middle part in the direction of the rotation axis. It is divided into a machine side and an engine side, and the duct-like space on the work machine side is communicated with the inside of the soundproof case through an opening provided in the bottom plate of the case to form a main intake passage, and the duct-like space on the engine side is connected to the soundproof case. It communicates with the oil pan cooling air passage and serves as an oil pan cooling air exhaust passage.

The present invention has an extremely simple structure in which the bottom of the soundproof case is double-bottomed, and the duct-like space formed by the double-bottomed space, which is open at both ends, is partitioned into the working machine side and the engine side at the middle part. An intake/exhaust air detour with low ventilation resistance is formed, thereby making it possible to significantly reduce noise leakage.

Cooling air is introduced into the soundproof case from the duct-like space on the work equipment side through the opening provided in the bottom plate of the case. A flow of cooling air is generated and hot air can be prevented from accumulating locally.

The outlet of the oil pan cooling air passage opens at the engine-side end of the duct-like space, and the cooling exhaust air is discharged from the engine-side end of the duct-like space, while the cooling air is discharged from the engine-side end of the duct-like space. Since the air is introduced from the end of the work machine side through the work machine side ventilation space partitioned off from the engine side, the cooled exhaust air that cools the oil pan and is heated flows into the work machine side duct-like space. There is no possibility that the cooling effect will be reduced due to being sucked into the soundproof case again from the main intake passage formed by the parts.

Furthermore, according to the present invention, the cylinder part, the exhaust muffler, and the oil pan part at the bottom of the crankcase are cooled by the exhaust air from the engine cooling fan. The oil pan cooling air passage is directly connected to the outside of the soundproof case through the ventilation space, so a single engine cooling fan can cool both the cylinder and oil pan. Even though only a portion of the engine is cooled, a large amount of air can be obtained with relatively low exhaust air pressure, and the entire engine can be effectively cooled.

The cooling air passage that cools the cylinder part and the exhaust muffler is formed by a duct that covers them, and the work equipment cooling exhaust air from the work equipment cooling fan joins into this duct, but as mentioned above, engine cooling Since the exhaust air pressure is relatively narrow, the working machine cooling exhaust air smoothly flows into the duct, so that the working machine is also effectively cooled by a sufficient amount of cooling air.

Embodiments Hereinafter, the present invention will be described with reference to illustrated embodiments. This embodiment is an engine generator equipped with a generator as a working machine, and FIGS. 1 to 3 are a plan view, a side view, and a front view, respectively, showing the interior of the soundproof cover of the engine generator.

Reference numeral 1 denotes an engine, behind which generators 2 are arranged in the direction of the rotating shaft, with their input shafts directly connected to the output shaft of the engine 1. Note that the front or rear of the engine generator refers to the engine side, that is, the left side in FIGS. 1 and 2, and the generator side, that is, the right side in the figures, as the rear. The engine 1 and the generator 2 are attached to reinforcing plates 4, 4 provided on the bottom plate 3 of the soundproof case via rubber mounts 5, respectively. As shown in FIG. 3, the engine 1 is arranged in a low position with a cylinder 6 inclined laterally, and the exhaust gas is placed in a space formed behind the cylinder 6 and on the side of the generator 2. An engine exhaust system including a muffler 7 is provided. Each of these devices includes the bottom plate 3, side plates 8, 8, top plate 9, and end plates 10, 1.
The fuel tank 11 is housed in a soundproof case consisting of 0, and a fuel tank 11 is disposed above the inside of the soundproof case.

The engine 1 is provided with an engine cooling fan 12 attached to the outer end of its crankshaft, and is covered by a fan cover 13. The fan cover 13 is a shroud 1 that covers the cylinder 6.
4, and the shroud 14 extends rearward and communicates with a muffler duct 15 (FIG. 1). The end of the muffler duct 15 opens to the outside of the soundproof case through an exhaust port 16 provided in the rear end plate 10. The exhaust muffler 7 is disposed within the muffler duct 15, and the engine exhaust passes through the exhaust pipe 17, enters the exhaust chamber 18 of the exhaust muffler 7, and then exits from the outlet 7a at the upper rear part through the exhaust port 16 to the outside. is discharged. Thus, the shroud 14 and the muffler duct 15 allow the engine 1 to
A duct that covers the cylinder portion 6 and the exhaust muffler 7 and communicates with the outside through the exhaust port 16 is formed at the distal end.

The generator 2 also has a built-in generator cooling fan 19 at its rear end. The generator cooling fan 1
The air sucked into the generator 2 by 9 passes through the inside of the generator to cool it, as shown by the dotted arrow B in FIGS. 1 and 2, and then enters the duct from the front. It is discharged.

FIG. 4 is an exploded perspective view of the bottom of the soundproof case.
A lower bottom plate 28 extends below the center portion of the bottom plate (case bottom plate) 3 in the left-right direction at an interval, forming a double bottom structure. This lower bottom plate 28 has end edges 28 bent upward at its front and rear sides, respectively.
It is attached to the bottom plate 3 via a, 28b, and ventilation holes 29, 29, . . . are provided in the edge portions 28a, 28b. Channel-shaped leg members 30 are attached to both sides of the bottom plate 3 so as to run vertically from front to back, and openings formed between the bottom plate 3 and the bottom plate 3 are formed on both sides of the lower bottom plate 28 by the leg members 30. It gets blocked. Thus, a ventilation space (duct-like space) is formed between the bottom plate 3 and the lower bottom plate 28, which is open at both front and rear ends by the ventilation holes 29 and closed on both sides by the leg members 30. Lower bottom plate 2
A partition wall 31 extending left and right is provided between the engine 1 side and the engine 1 side, and a partition wall 31 extending left and right is provided at the center in the front-rear direction, and the ventilation space is formed by the partition wall 31 into a ventilation space 32a on the engine 1 side, as shown in FIG. It is partitioned into a ventilation space 32b on the generator 2 side.

The bottom plate 3 has intake ports 20a, 20b and a large number of small intake ports 2 in a portion forming the ventilation space 32b.
Further, air inlets 20d are provided at both ends of the air inlet 20c, and at portions directly above the leg members 30. These intake ports 2
0 constitutes a main intake port that guides cooling air into the soundproof case, and is formed on the generator 2 side as described above. Both front and rear ends of the leg member 30 are open,
An air guide path 26 is formed between the bottom plate 3 and the bottom plate 3 . A communication port 33 communicating with the ventilation space 32b is provided at the rear of the side plate 30a inside the leg member 30.

Cooling air is introduced into the soundproof case from the outside through the following route. The air flowing into the ventilation space 32b through the ventilation opening 29 provided at the rear end edge 28b of the lower bottom plate 28 flows through the intake opening 20a,
It is sucked into the soundproof case through 20b and 20c. Furthermore, the air guide path 2 is provided from the front and rear of the leg member 30.
A part of the air that has flowed into the air inlet 6 is sucked into the soundproof case through the intake port 20d, and the remaining air is guided into the ventilation space 32b through the communication port 33, and then through the intake ports 20a, 20b, and 20c. It gets sucked into the soundproof case.

Incidentally, the engine cooling fan 12 has a larger air volume than the generator cooling fan 19, and exerts a large suction force on the air introduced into the soundproof case through each intake port 20. Therefore, even though the intake ports 20 are unevenly distributed on the generator 2 side, the amount of cooling air sucked into the generator 2 by the nearby generator cooling fan 19 is small, and the remaining large amount of air is used by the engine. It is sucked into the engine 1 side by the cooling fan 12. As a result, an appropriate amount of cooling air is distributed between the generator side and the engine side according to their respective calorific values, and efficient cooling is performed. A continuous, directional flow of cooling air is generated from the generator 2 and muffler duct 15 at the rear toward the engine 1 at the front. As a result, there is no part where air stays inside the machine (outside the generator, ducts, and engine), so there is no possibility of localized high-temperature parts.

The cooling air A that has reached the front of the engine 1 in this way is sucked into the fan cover 13 by the engine cooling fan 12, and a part of it is drawn into the fan cover 13 by the arrow C
As shown in , the air flows inside the shroud 14 communicating with the fan cover 13 along the cylinder 6 of the engine 1 , cools the cylinder 6 , and then is sent into the muffler duct 15 . and muffler duct 1
5, the exhaust pipe 17 and the exhaust muffler 7
is cooled and discharged to the outside through the exhaust port 16.
As described above, the cooling exhaust air from the generator 2 is also forced into the muffler duct 15, contributing to cooling the exhaust muffler 7 and the like.

In this manner, the cylinder portion of the engine 1 is cooled, and the oil pan portion 21 provided at the bottom of the crankcase is cooled from the outside by the cooling air from the engine cooling fan 12. For this reason, the air guiding member 23
is fixed to the outer surface of the oil pan portion 21 together with the rubber mount 5 that supports the engine 1. This air guiding member 23 is an integrally press-molded product, and has an oil pan cooling air passage 22 formed inside thereof. The front end of this oil pan cooling air passage 22 communicates with the inside of the fan cover 13, and the rear end is bent downward and opens toward the ventilation space 32a through an exhaust port 27 provided on the bottom plate 3 of the soundproof case. are doing. The air guiding member 23 is elastically supported at the bottom plate 3 by a cylindrical rubber member 24 surrounding the opening. This rubber member 24 supports the air guiding member 23, which vibrates integrally with the engine 1, on the bottom plate 3 while blocking vibrations, and also allows the cooling exhaust air in the oil pan cooling air passage 22 to be passed through the opening from the soundproof case. It serves as a seal to prevent leakage. Therefore, a part of the cooling air sucked into the fan cover 13 by the engine cooling fan 12 is guided from the fan cover 13 to the oil pan cooling air passage 22 as shown by arrow D.
After cooling the oil pan portion 21, the ventilation space 32
a, and is discharged forward from a ventilation hole 29 provided at the front edge 28a of the lower bottom plate 28.

In this embodiment, as described above, the cylinder 6, the exhaust muffler 7, and the oil pan portion 21 are cooled by the exhaust air from the engine cooling fan 12, but the cylinder 6 and the exhaust muffler 7 are cooled. A passage for the cooling air C and a passage for the cooling air D that cools the oil pan portion 21 are branched from each other and are in a parallel relationship, and each communicates with the outside. Therefore, even though the cylinder 6, exhaust muffler 7, and oil pan section 21 are both cooled by one engine cooling fan 12, a large air volume is supplied to the engine even though the exhaust air pressure inside the duct is relatively low. It can flow around the outer periphery of the engine, effectively cooling the entire engine.

The cooling exhaust air B after cooling the generator 2 by the generator cooling fan 19 joins into the duct (shroud 14, muffler duct 15) that forms the passage for the cooling air C. Wind C
Since the pressure is relatively low, the cooling exhaust air B smoothly flows into the duct, and the generator 2 is also effectively cooled by a sufficient amount of cooling air.

In this embodiment, the cooling air is guided into the soundproof case through the ventilation space 32b, and the cooling exhaust air from the oil pan is discharged to the outside through the ventilation space 32a. The noise leaking to the outside can be greatly reduced, and the detoured air path described above is created by an extremely simple structure in which the bottom of the soundproof case is made with a double bottom and partitioned into the engine side and the generator side. Ru.

Furthermore, cooling air mainly flows into the ventilation space 32b from the rear end edge 28b of the lower bottom plate 28, whereas cooling exhaust air from the oil pan section is discharged to the outside from the front end edge 28a. The cooling exhaust air, which is heated by cooling the oil pan portion 21, is sucked into the soundproof case again immediately after being discharged, and the cooling efficiency of the engine 1 and the generator 2 is not reduced.

In addition, since the main intake port 20 into the soundproof case is unevenly located on the generator side, a continuous flow A of cooling air with directionality is generated in the soundproof case from the generator side to the engine side, causing hot air to flow locally. This can effectively prevent water from accumulating.

Effects of the invention As described above, in the present invention, an engine and a work machine driven by the engine are arranged side by side in the direction of the rotation axis, and these are housed in a soundproof case. An engine cooling fan is provided on the engine, and a fan cover that covers the engine cooling fan is provided outside the soundproof case at a distal end thereof, covering a cylinder portion and an exhaust muffler of the engine. The opening duct communicates with an oil cooling air passage provided along the oil pan portion of the engine, and the cooling exhaust air from the fan for cooling the work equipment is joined to the duct, and the soundproofing the bottom of the case,
The case bottom plate and the lower bottom plate below the case bottom plate form a double bottom having a duct-like space that is open to the outside at both ends in the direction of the rotation axis, and the duct-like space is operated at the middle part in the direction of the rotation axis. It is divided into a machine side and an engine side, and the duct-like space on the work machine side is communicated with the inside of the soundproof case through an opening provided in the bottom plate of the case to form a main intake passage, and the duct-like space on the engine side is connected to the soundproof case through an opening provided in the bottom plate of the case. Since the oil pan cooling air passage is communicated with the oil pan cooling air passage to form an exhaust passage for oil pan cooling air, the air volume of the engine cooling fan can be increased and each part of the engine can be efficiently cooled. Further, the exhaust air from the work machine cooling fan does not interfere with the exhaust air from the engine cooling fan, thereby reducing the amount of exhaust air and reducing the overall cooling effect. Furthermore, the ventilation resistance of cooling air is small,
Local accumulation of hot air within the soundproof case can be reduced, and noise leakage to the outside can be greatly reduced. In addition, many other excellent effects can be obtained, such as the oil pan cooling exhaust air being recirculated within the soundproof case and cooling efficiency not being reduced.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing the inside of the soundproof cover of an engine generator that is an embodiment of the present invention, Fig. 2 is a side view of the same, Fig. 3 is a front view of the same, and Fig. 4 is an exploded perspective view of the bottom of the soundproof cover. It is a diagram. 1...engine, 2...generator, 3...bottom plate,
4... Reinforcement plate, 5... Rubber mount, 6... Cylinder, 7... Exhaust muffler, 8... Side plate, 9...
Upper plate, 10... End plate, 11... Fuel tank, 12
... Engine cooling fan, 13 ... Fan cover, 14 ... Shroud (duct), 15 ... Muffler duct (duct), 16 ... Exhaust port, 17 ...
...exhaust pipe, 18...exhaust chamber, 19...generator cooling fan, 20...intake port, 21...oil pan portion, 22...oil pan cooling air path, 23...blow guide member, 24... ... Rubber member, 25 ... Wind guide plate, 2
6... Air guide path, 27... Air exhaust port, 28... Lower bottom plate, 29... Ventilation port, 30... Leg member, 31...
Partition wall, 32...Ventilation space, 33...Communication port.

Claims (1)

[Scope of utility model registration request] In a soundproof engine working machine in which an engine and a work machine driven by the engine are arranged side by side in the direction of the rotation axis and housed in a soundproof case, the work machine is equipped with a fan for cooling the work machine, and the engine is equipped with a fan for cooling the engine. Each fan is provided, and a fan cover that covers the engine cooling fan is provided.
A duct that covers a cylinder portion and an exhaust muffler of the engine and opens to the outside of the soundproof case at a distal end, and communicates with an oil pan cooling air passage provided along an oil pan portion of the engine, and the duct The bottom of the soundproof case is formed into a duct-like structure with both ends in the direction of the rotating shaft open to the outside, formed by a case bottom plate and a lower bottom plate below the case bottom plate. The duct-like space is partitioned into a work machine side and an engine side at an intermediate part in the direction of the rotation axis, and the duct-like space on the work machine side is provided on the bottom plate of the case. The opening communicates with the inside of the soundproof case to serve as a main intake passage, and the duct-shaped space on the engine side communicates with the oil pan cooling air passage to serve as an exhaust passage for oil pan cooling air. Soundproof engine working machine.