JP6529467B2 - Engine driven work machine - Google Patents

Description

  The present invention relates to an engine driven work machine such as an engine generator, an engine welder, and an engine compressor.

  At an outdoor work site such as road construction, an engine-driven work machine in which a work machine body such as an engine, a generator driven by the engine, a welding machine, a compressor, etc. is housed in one casing is operating. When installing such an engine drive work machine in a narrow space, it is necessary to miniaturize the engine drive work machine and to reduce the installation area.

  Then, an engine drive working machine as shown by patent documents 1 is proposed. In the engine-driven work machine, the casing is divided into upper and lower parts, and the lower chamber is housed with the engine, the main body of the work machine driven by the engine, and the muffler of the engine, and an intake port for taking in cooling air. In the upper chamber, place the muffler exhaust pipe by meandering or bending in the horizontal plane, and from the lower chamber to the upper chamber introduce the cooling exhaust air that has cooled the engine, the working machine main body and the muffler, and exhaust the muffler The exhaust exhausted from the pipe and the cooled exhaust air are mixed in the upper chamber, and are discharged from one side of the upper chamber to the outside.

  FIG. 8 is a view showing such a conventional engine-driven work machine. In FIG. 8, 1 is an engine, 2 is a generator, 3 is a lower chamber, 5 is an upper chamber, 6 is an engine exhaust pipe, 7 is a muffler, 8 is a muffler exhaust pipe, 9 is a lower intake port, 16 is an electric fan, The reference numeral 19 denotes an upper intake port.

  The engine 1, the engine exhaust pipe 6, and the muffler 7 are covered by an engine cover 100b, and the cooling air sucked from the lower intake port 9 is fed into the engine cover 100b by the engine fan 100a. 1. Cooling of the engine exhaust pipe 6 and the muffler 7 is performed. Further, the cooling air sucked from the upper intake port 19 is introduced into the generator 2 by the generator fan 200a to cool the generator, and then the inside of the engine cover 100b via the generator cover 200b. Spit up. The air thus expelled also contributes to the cooling of the engine exhaust pipe 6 and the muffler 7.

  Furthermore, after the cooling air sucked from the other upper intake port 19 is applied to the control unit (not shown) disposed at the upper part of the lower chamber 3 for cooling, the engine fan 100a is used to cover the engine cover 100b. The engine 1, the engine exhaust pipe 6, and the muffler 7 are cooled.

  After cooling the engine 1, the engine exhaust pipe 6 and the muffler 7 in this manner, the cooled exhaust air is sent into the upper chamber 5 by the electric fan 16, and the muffler is disposed to meander or bend in the horizontal plane. After cooling the exhaust pipe 8, the exhaust exhausted from the muffler exhaust pipe 8 and the cooled exhaust air are mixed in the upper chamber 5, and the mixture is discharged from the front of the upper chamber 5 to the outside.

  In the above-described conventional engine-driven work machine, the height is also reduced while the installation area is reduced.

Japanese Patent Application Laid-Open No. 10-131762

  However, since the conventional engine-driven working machine has only one outlet for cooling exhaust air, the flow of the cooling air is obstructed, and the cooling efficiency is deteriorated. In addition, since high temperature cooling air is applied to the electric fan, the electric fan needs to have high heat resistance, and there is also a problem that the cost increases accordingly.

  An object of the present invention is, in view of such problems, to improve the flow of cooling air in a housing and to improve the cooling efficiency. Another object of the present invention is to eliminate the need for high heat resistance as an electric fan.

  In order to solve the above-mentioned problems, the invention according to claim 1 of this application includes an engine, a working machine main body driven by the engine, an engine exhaust pipe of the engine, a muffler to which the engine exhaust pipe is connected, and a muffler exhaust pipe. An engine driven work machine housed in a housing, wherein the housing is divided into three upper, middle, and lower chambers, the lower chamber houses the engine and the working machine main body, and the middle chamber is the muffler. There is provided a muffler chamber for housing, the upper chamber for housing the muffler exhaust pipe, and a first exhaust chamber provided with a first exhaust port on one side, and the first exhaust chamber being partitioned, A second exhaust air chamber provided with a second exhaust air outlet facing in the same direction as the air outlet, and the cooling air entering the muffler chamber from the lower chamber is divided into two parts after cooling the muffler, one of them After being introduced into the first exhaust chamber, the exhaust gas from the muffler exhaust pipe The first exhaust port is discharged to the outside of the machine, and the other is introduced into the second exhaust air chamber through the exhaust air passage divided by the partition plate, and is discharged to the outside of the machine from the second exhaust port. It is characterized by

    In the invention according to claim 2 of the present application, in the invention according to claim 1, the engine covers the intake side with a cover, the intake port at one end of the cover, and the exhaust port in the engine block at the other end. An engine exhaust duct having an engine exhaust pipe disposed therein, wherein the intake port of the engine is connected to a lower intake port provided at a lower end portion of the housing by an engine intake duct, and the exhaust port on the other end side And a fan chamber provided with an electric fan for feeding air to the muffler chamber is provided in the middle chamber, and the lower end portion of the fan chamber is communicated with the lower chamber. It is characterized by

  Also, in the invention according to claim 3 of the present application, according to the invention according to claim 2, the muffler is disposed in the longitudinal direction, and the lower end portion of the muffler is a horizontal plate-like attachment extending from the wall on the fan chamber side. It is characterized in that it is fixed by a bracket.

Also, in the invention according to claim 4 of the present application, in the invention according to claim 1, 2 or 3, the upper exhaust chamber is divided into the first exhaust air chamber and the second exhaust air chamber, and the first exhaust air chamber is An air intake chamber having an upper air intake port is provided on the side different from the air outlet and the second air outlet, and a control box storage chamber for storing a control box for controlling the work machine is provided in the middle chamber; The control box storage chamber is communicated with the control box intake duct, and the lower end of the control box intake duct is opened to the lower chamber.

The invention according to claim 5 of the present application is the invention according to claim 2 or 3 , wherein the upper exhaust chamber is divided into the first exhaust air chamber and the second exhaust air chamber, and the first exhaust air outlet, An intake chamber with an upper intake port is provided on the side different from the second air outlet, a control box storage chamber for storing a control box for controlling the work machine is provided in the middle chamber, and control is performed from the intake chamber The box storage chamber is communicated with the control box intake duct, and the lower end of the control box intake duct is opened to the lower chamber, and a communication port is provided between the control box storage chamber and the fan chamber. It features.

  In the invention according to claim 6 of the present application, according to the invention according to claim 1, 2, 3, 4 or 5, of the panels surrounding the outer periphery of the middle chamber, the lower end face of the panel facing the exhaust air passage It is characterized in that a third air outlet is provided.

The present invention has the following effects.
That is, in the invention according to claim 1, the casing is divided into the upper, middle, lower, and three rooms, the lower room is provided with the engine and the working machine main body, and the middle room is provided with the muffler room for containing the muffler. The upper exhaust chamber is housed in the upper chamber, and the first exhaust air chamber provided with the first exhaust air outlet on one side and the first exhaust air chamber are partitioned, and the first exhaust air outlet is directed in the same direction A second exhaust chamber provided with a second exhaust port is provided, and the cooling air entering the muffler chamber from the lower chamber is divided into two after cooling the muffler, one of which is the first exhaust air After being introduced into the chamber, the exhaust air from the first exhaust port is discharged to the outside together with the exhaust from the muffler exhaust pipe, and the other is introduced into the second exhaust air chamber through the exhaust air passage divided by the partition plate, It was made to discharge from the above-mentioned 2nd exhaust air port outside the machine. As a result, the number of exhaust air paths is increased, the flow of cooling air in the housing is improved, and the cooling efficiency can be improved.

  In the invention according to claim 2, in the engine-driven work machine according to claim 1, the engine covers the intake side with a cover, exhausts the intake port at one end of the cover, and discharges the engine block at the other end. An air outlet is provided, the air intake of the engine is connected to a lower air intake provided at the lower end of the housing by an engine air intake duct, and an exhaust air outlet at the other end is an engine exhaust with the engine exhaust pipe disposed therein. A fan chamber having an electric fan for communicating air with the lower end portion of the muffler chamber by a wind duct and providing air to the muffler chamber is provided in the middle chamber, and the lower end portion of the fan chamber is connected with the lower chamber. I made it communicate. As a result, in addition to the above effect of the invention according to claim 1, since the cooling air which has cooled the engine to a high temperature directly enters the muffler chamber, the temperature rise in the lower chamber is suppressed, and the temperature rise as such Because the air in the lower chamber, which is reduced, is introduced into the muffler chamber through the fan chamber, the muffler can be cooled efficiently. In addition, since the temperature of the air sent to the fan room is not high, the electric fan in the fan room does not require high heat resistance.

  In the invention according to claim 3, in the engine drive work machine according to claim 2, the muffler is disposed in the vertical direction, and the lower end portion of the muffler is a horizontal plate shape extending from the wall on the fan chamber side. In addition to the above effect of the invention according to claim 2, the flow of the cooling air fed into the muffler chamber from the engine exhaust duct is opposite to the side of the muffler and the electric fan by the mounting bracket. It is dispersed on the side of the muffler barrel side, and the flow on the muffler fan side of the electric fan decreases, and the cooling air from the electric fan passes through the muffler drum side of the electric fan and faces the exhaust air passage direction. It will be easier. As a result, the flow of the cooling air from the electric fan and the flow of the cooling air from the engine exhaust duct are less likely to interfere with each other and noise is reduced.

In the invention according to claim 4, in the engine-driven work machine according to claim 1, 2, or 3, the upper exhaust chamber is divided into the first exhaust air chamber and the second exhaust air chamber. An intake chamber having an upper intake port is provided on the side different from the first exhaust outlet and the second exhaust outlet, and a control box storage chamber for storing a control box for controlling the work machine is provided in the middle chamber, Since the control box storage chamber is communicated with the control box intake duct from the intake chamber by the control box intake duct and the lower end of the control box intake duct is opened to the lower chamber, in addition to the above effects of the invention according to claims 1 to 3, The cooling air after cooling the electrical components in the control box can be used to cool the lower chamber and the muffler while efficiently cooling the electrical components in the box.

In the invention according to claim 5, in the engine drive work machine according to claim 2 or 3 , the upper exhaust chamber is divided into the first exhaust air chamber and the second exhaust air chamber, and the first exhaust air is separated. An air intake chamber having an upper air intake port is provided on the side different from the air outlet and the second air outlet, and a control box storage chamber for storing a control box for controlling the work machine is provided in the middle chamber; The control box storage chamber is communicated with the control box intake duct, and the lower end of the control box intake duct is opened to the lower chamber, and a communication port is provided between the control box storage chamber and the fan chamber. Therefore, in addition to the above effects of the invention according to claims 2 and 3 , the cooling air after cooling the electrical components in the control box while efficiently cooling the electrical components in the control box can be on available for cooling, after cooling the electrical components within the control box Care 却空 is introduced into the fan chamber, it can be used in the cooling of the muffler.

In the invention according to claim 6, in the engine driven work machine according to claim 1, 2, 3, 4 or 5, of the panels surrounding the outer periphery of the middle chamber, the panel facing the exhaust air passage Since the third exhaust port is provided on the lower end face, in addition to the above-mentioned effects of the invention according to claims 1 to 5, more exhaust ports after muffler cooling can be secured, and the flow of exhaust air is improved and the muffler is Cooling efficiency is improved.

It is a figure showing the engine drive work machine concerning one example of the present invention. It is a figure which shows the external appearance of the engine drive working machine of FIG. It is a figure which shows the inside of a room of the engine drive working machine of FIG. It is a figure which shows the shelf board provided between a lower chamber and a middle chamber. It is a figure which shows the partition plate which divides a middle room. It is a figure showing a control box air intake duct. It is a figure which shows the flow of the cooling air in a muffler room. It is a figure which shows the conventional engine drive working machine.

  Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

FIG. 1 is a view showing an engine drive working machine according to an embodiment of the present invention, and FIG. 1 (A) is a view of the inside of the working machine as viewed from the front, and FIG. FIG. 1 (C) is a view as seen from the rear, and FIG. 1 (D) is a view as seen from above the work implement. FIG. 2 is a view showing the appearance of the engine drive work machine of FIG. In FIGS. 1 and 2, 1 is an engine, 2 is a generator, 3 is a lower chamber, 4 is a middle chamber, 5 is an upper chamber, 6 is an engine exhaust pipe, 7 is a muffler, 8 is a muffler exhaust pipe, 9 and 11 Is a lower intake port, 10 is an engine intake duct, 12 is a generator intake duct, 14 is an engine exhaust duct, 15 is a first exhaust port, 16 is an electric fan, 17 is an exhaust outlet, and 18 is a second exhaust port , 19 is an upper intake port, 20 is an opening for a control box intake duct, 21 is a control box, 22 is a control box intake duct, 23 is a third exhaust port, 24 is a communicating port, 25 is an air cleaner, 26 is a fuel tank, 27 is a battery, 28 _U is an upper front panel, 28 _L is a lower front panel, 29 is an openable rear panel, 30 is an open lock, and 31 is a base.

  The working machine casing is divided into three rooms, the upper middle, the lower, the lower room 3, the engine 1 and the generator 2 are housed, and the engine 1 is covered with the cover 1a on the intake side. An intake fan (not shown) is provided inside the cover 1a, the intake port 1b is provided at one end of the cover 1a, and the exhaust port 1c is provided at the other end of the engine block. The intake port 1 b is connected to a lower intake port 9 provided at one lower end of the base 31 by an engine intake duct 10 airtightly connected via a sealing material 13. Further, the air outlet 1 c is connected to the muffler chamber 41 by the engine air exhaust duct 14. In the muffler chamber 41, the muffler 7 is disposed in the vertical direction, and the lower end portion thereof is fixed by a horizontal plate-like mounting bracket 7a extending from the wall on the fan chamber 42 side and passes through the engine exhaust duct 14 It is connected to the engine exhaust pipe 6.

  The generator 2 includes an air inlet 2a and a fan (not shown) for taking in air for cooling into the inside, and an air outlet 2b for discharging air after cooling, and the air inlet 2a is a sealing member 13 Is connected to the lower intake port 11 provided at the other lower end of the base 31 by the generator intake duct 12 airtightly connected via the air conditioner, and after the inside is cooled by the air taken in from the lower intake port 11, the exhaust air outlet Discharge into the lower chamber 3 from 2b.

In the middle room 4, in addition to the above-mentioned muffler room 41, a fan room 42 equipped with an electric fan 16, a control box storage room 43 for storing a control box 21 containing an inverter circuit for controlling the work machine, etc. It is divided into a fuel tank storage chamber 44 for storing 26 and an exhaust air passage 45. The fan chamber 42 is open at the bottom and communicates with the lower chamber 3. In addition, the electric fan 16 of the fan chamber 42 is provided between the fan chamber 42 and the muffler chamber 41, whereby air is sent from the fan chamber 42 to the muffler chamber 41. Also, the exhaust air passage 45
As shown in FIG. 3, the partition plate 47a, and is defined by 47b, it is formed between the fan chamber 42 and the fuel tank housing chamber 44 and the upper front panel 28 _U, and communicates with the muffler chamber 41. Further, the muffler chamber 41 and the control box storage chamber 43 are partitioned by the partition plate 47 c, and the control box 21 in the control box storage chamber 43 and the fan chamber 42 are communicated by the communication port 24. There is.

  FIG. 4 is a view showing a shelf board provided between the lower chamber and the middle chamber. The upper side of the figure is the front side of the work machine. In the shelf plate 46, an opening 46a for connecting the engine exhaust air duct 14 to the muffler chamber 41, an opening 46b for communicating between the fan chamber 42 and the lower chamber 3, a control box storage chamber 43 and the lower chamber 3 An opening 46c for communicating between them, an opening 46d for penetrating the control box intake duct 22 to the lower chamber 3 side, and openings 46e and 46f for passing a fuel pipe, a fuel cock or the like between the fuel tank storage chamber 44 and the lower chamber 3 Is provided.

FIG. 5 is a view showing a partition plate for partitioning the middle room, and FIG. 5 (A) is a partition plate 47a for partitioning the fan chamber 42 and the exhaust air passage 45, and FIG. 5 (B) is a fuel tank storage chamber A separating plate 47 b is provided to separate the air duct 44 and the exhaust air passage 45. Of the partition plate 47a, the wallboard 47a ₁ partitioning between the muffler chamber 41 and the fan chamber 42, the opening 47a ₂ for mounting the electric fan 16 is provided, further, the fan chamber 42 and the exhaust air passage 45 provided wallboard 47a ₃ partitioning between, on the between the wall plate 47a ₁ and the wall plate 47a _3, the top plate 47a ₄ are provided, the mounting plate 47a ₅ is provided in the lower wall plate 47a ₁ mounting plate 47a ₆ is provided at the edge of the top plate 47a ₄ and. Further, the partition plate 47 b is a wall plate 47 b ₁ for partitioning between the fan chamber 42 and the fuel tank storage chamber 44, a wall plate 47 b ₂ for partitioning between the fuel tank storage chamber 44 and the exhaust air passage 45, and a wall plate 47 b ₁ wall plate 47b ₃ partitioning the opposing faces of, further on between the wallboard 47b ₁ and the wall plate 47b ₂ and wall plate 47b ₃ is top plate 47b ₄ and the attachment plate 47b ₆ is provided, mounted on the lower plate 47b ₅ is provided.

  As shown in FIG. 1D, the upper chamber 5 is divided into a first exhaust air chamber 51, a second exhaust air chamber 52, and an intake air chamber 53 by the partition plates 54 and 55, and the first exhaust air is separated. The chamber 51 is in communication with the muffler chamber 41, receives the cooling air sent from the muffler chamber 41, and discharges it from the first exhaust port 15 to the outside. The second exhaust air chamber 52 communicates with the exhaust air passage 45, receives part of the cooling air from the muffler chamber 41 through the exhaust air passage 45, and exhausts the second exhaust air outlet 18 to the outside. The intake chamber 53 communicates with the upper intake port 19, and the bottom portion is provided with an opening 20 for a control box intake duct for inserting the upper portion of a control box intake duct described later. The taken-in cooling air is sent to the control box storage room 43 through the control box intake duct.

  FIG. 6 is a view showing a control box intake duct. The control box air intake duct 22 has two passages, and as shown in FIG. 1C, one short passage 22a is in communication with an opening provided on the upper surface of the control box 21 to form a control box 21. The cooling air is supplied to cool the inside of the and the front side 21a of the inverter circuit. Further, the other long passage 22b is U-shaped in cross section, and the opening side thereof faces the side plate 21c of the control box 21 to form an air flow path, and the side plate 21c is formed to cool the inverter circuit. An opening 21d for passing the fin 21b is provided. Then, the cooling fins 21b are cooled through the openings 21d so that the cooling fins 21b are disposed in the passage 22b of the control box intake duct 22. Further, the lower end portion of the passage 22b of the control box air intake duct 22 extends downward and communicates with the lower chamber 3.

Next, the flow of the cooling air in the work implement housing will be described with reference to FIG. Cooling of the engine 1 introduces air taken in from the lower air intake 9 through the engine intake duct 10 and into the interior from the air intake 1b, and cooling air after engine cooling passes through the exhaust air outlet 1c and the engine exhaust air duct 14 and the engine The exhaust pipe 6 is cooled and fed into the muffler chamber 41. After the muffler 7 is cooled in the muffler chamber 41, it is fed into the first exhaust air chamber 51, and after cooling the muffler exhaust pipe 8 there, the exhaust gas is discharged from the muffler exhaust pipe 8 to the outside from the first exhaust port 15 Exhausted. Thus, since the cooling air of the engine 1 is not discharged into the lower chamber 3, the temperature rise in the lower chamber 3 is suppressed. Further, an intake opening of the air cleaner 25 is provided in the engine intake duct 10.

  On the other hand, for cooling of the generator 2, the air taken in from the lower air intake 11 opposite to the lower air intake 9 is introduced into the interior from the air intake 2a through the generator air intake duct 12, and cooling air after generator cooling The air is discharged into the lower chamber 3 from the air outlet 2b. Thus, although the cooling air of the generator 2 is discharged into the lower chamber 3, since the generator 2 is a magnet type generator, the exhaust temperature of the generator does not become very high, and the temperature rise in the lower chamber 3 It does not affect much

  The air in the lower chamber 3 whose temperature is kept relatively low as such is taken into the fan chamber 42, is fed into the muffler chamber 41 by the electric fan 16, and is used to cool the muffler 7. Thus, the muffler 7 is cooled not only by the cooling air of the engine 1 but also by the air fed from the lower chamber 3 through the fan chamber 42. At that time, since the air fed from the lower chamber 3 via the fan chamber 42 has a relatively low temperature, the muffler 7 is efficiently cooled. In addition, since the temperature of the air fed by the electric fan 16 is not high, it is possible to use the electric fan 16 which is not very high in heat resistance.

  Here, the relationship between the air fed into the muffler chamber 41 through the engine exhaust duct 14 and the air fed into the muffler chamber 41 by the electric fan 16 will be described using FIG. 7. A horizontal plate-like mounting bracket 7a extending from a wall on the fan chamber 42 side for fixing the muffler 7 extends above the opening 46a serving as the outlet of the engine exhaust duct 14 in the muffler chamber 41. . Therefore, the air sent into the muffler chamber 41 from the bottom up through the engine exhaust duct 14 is blocked by the mounting bracket 7 a at the trunk side of the fan chamber 42 of the muffler 7, and the side of the muffler 7 And it flows intensively to the body on the opposite side to the fan room 42. On the other hand, the air fed into the muffler chamber 41 by the electric fan 16 strikes the body of the muffler 7 and is distributed to the left and right, and is guided to the exhaust air passage 45 as it is on the exhaust air passage 45 side and distributed to the opposite side The exhausted air strikes the wall of the muffler chamber 41 and is guided to the exhaust air passage 45 side.

  In this way, the air fed into the muffler chamber 41 through the engine exhaust air duct 14 and the air fed into the muffler chamber 41 by the electric fan 16 are separated from each other with the muffler 7 in between, so interference is caused. The occurrence of turbulent flow is suppressed, the flow becomes smooth, and the noise generation due to the turbulent flow is reduced, thereby improving the soundproofing effect.

As such cooling air introduced into the muffler chamber 41 is exhaust air passage in addition to being discharged from the first air discharge port 15 described above, which is formed between the partition plates 47a, 47b and the upper front panel 28 _U 45 and flows upward, through the exhaust air outlet 17 formed in the space between the top plate 47 b ₄ of the partition plate 47 b and the upper chamber 5, from the opening of the bottom surface of the second exhaust air chamber 52 The gas enters the second exhaust chamber 52 and is discharged to the outside from the second exhaust port 18. At that time, since the first exhaust air chamber 51 and the second exhaust air chamber 52 are separated by the partition plate 54, even if there is a large difference in the temperature of the cooling air coming into both chambers, they are mixed. Since the air is rectified and discharged separately, the flow is discharged smoothly without disturbance. Furthermore, part of the air passing through the exhaust air passage 45 is discharged to the outside from the third air discharge port 23 provided at the lower end of the upper front panel 28 _U.

  In this engine-driven work machine, since there are three discharge paths to the outside of the cooling air as described above, the exhaust air can be discharged smoothly, a sufficient flow rate can be secured, and a high cooling efficiency can be obtained.

On the other hand, the air taken into the intake chamber 53 from the upper intake port 19 is partially introduced from the upper end intake port of the control box intake duct 22 into the control box storage chamber 43 through the passage 22a. The inside of 21 and the surface side 21a of the inverter circuit are cooled. The air after cooling them is sent into the muffler chamber 41 through the communication port 24 and the fan chamber 42 and is used to cool the muffler 7. Further, the air taken into the passage 22b from the upper end intake of the control box air intake duct 22 cools the cooling fins 21b of the inverter circuit through the passage 22b and is then discharged into the lower chamber 3. At that time, since the calorific value of the cooling fin 21b of the inverter circuit is not large, the temperature rise of the air discharged into the lower chamber 3 through the control box intake duct 22 is limited, and the temperature rise in the lower chamber 3 it dose not connect.

Reference Signs List 1 engine 2 generator 3 lower chamber 4 middle chamber 5 upper chamber 6 engine exhaust pipe 7 muffler 8 muffler exhaust pipe 9, 11 lower intake port 10 engine intake duct 12 generator intake duct 13 seal member 14 engine exhaust wind duct 15 first Air outlet 16 Electric fan 17 Exhaust air outlet 18 Second air outlet 19 Upper air inlet 20 Control box intake duct opening 21 Control box 22 Control box intake duct 23 Third exhaust vent 24 Communication port 25 Air cleaner 26 Fuel tank 27 Battery 28 _U upper front panel 28 _L lower front panel 29 rear panel 30 opening and closing lock 31 base 41 muffler room 42 fan room 43 control box storage room 44 fuel tank storage room 45 exhaust air passage 46 shelf plate 47a to 47c partition plate 51 first exhaust air Room 52 Second Exhaust Air Room 53 Intake Room

Claims (6)

An engine-driven working machine including an engine, a working machine body driven by the engine, an engine exhaust pipe of the engine, a muffler to which the engine exhaust pipe is connected, and a muffler exhaust pipe housed in a housing,
The casing is divided into three upper, middle, and lower chambers, the lower chamber accommodates the engine and the main body of the working machine, the middle chamber is provided with a muffler chamber for accommodating the muffler, and the upper chamber is provided with the muffler A first exhaust chamber provided with an exhaust pipe and provided with a first exhaust opening on one side and the first exhaust chamber were partitioned and provided with a second exhaust opening facing in the same direction as the first exhaust opening. Establish a second exhaust room,
The cooling air that has entered the muffler chamber from the lower chamber cools the muffler and is then split into two hands, one of which is introduced into the first exhaust air chamber and then exhausted together with the exhaust from the muffler exhaust pipe. The first exhaust port is discharged to the outside of the machine, and the other is introduced into the second exhaust air chamber through the exhaust air passage divided by the partition plate, and is discharged to the outside of the machine from the second exhaust port. Engine-driven work machine characterized by     The engine is covered with a cover at the intake side, the intake port at one end of the cover, the exhaust port at the engine block at the other end, the intake port of the engine is provided at the lower end of the casing by an engine intake duct. The exhaust port on the other end side is connected to the lower end of the muffler chamber by an engine exhaust duct in which the engine exhaust pipe is disposed, and the middle chamber is connected to the lower chamber. The engine driven work machine according to claim 1, further comprising: a fan chamber provided with an electric fan for feeding air into the chamber, wherein a lower end portion of the fan chamber is in communication with the lower chamber.   The engine driven work machine according to claim 2, wherein the muffler is disposed in the longitudinal direction, and a lower end portion of the muffler is fixed by a horizontal plate-like mounting bracket extending from a wall on the fan chamber side. The upper chamber is divided into the first exhaust air chamber and the second exhaust air chamber, and an air intake chamber having an upper air intake opening on the side different from the first exhaust air outlet and the second exhaust air outlet is provided. A control box storage room for storing a control box for controlling the work machine is provided in the middle room, and the control box storage room is communicated with the control box intake duct from the intake chamber and the lower end of the control box intake duct is The engine driven work machine according to any one of claims 1 to 3, wherein the lower chamber is opened. The upper chamber is divided into the first exhaust air chamber and the second exhaust air chamber, and an air intake chamber having an upper air intake opening on the side different from the first exhaust air outlet and the second exhaust air outlet is provided. A control box storage room for storing a control box for controlling the work machine is provided in the middle room, and the control box storage room is communicated with the control box intake duct from the intake chamber and the lower end of the control box intake duct is The engine driven work machine according to claim 2 or 3 , wherein the lower chamber is opened and a communication port is provided between the control box storage chamber and the fan chamber.   The engine according to claim 1, 2, 3, 4 or 5, wherein a third exhaust port is provided in a lower end surface of the panel facing the exhaust passage among the panels surrounding the outer periphery of the middle chamber. Drive work machine.

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