JP4119831B2 - Intake duct structure of engine room of construction machinery - Google Patents

Description

  The present invention relates to an intake duct structure for an engine room of a construction machine.

  As a prior art of an intake device for an engine room of a construction machine, for example, there is one described in Patent Decentralization 1. According to this document, noise generated in the engine room is reduced from leaking to the outside, and heat generated in the engine room is easily released to the outside. As shown in FIG. 6A, the technique described in Patent Document 1 is an enclosure as a bulkhead 11 formed in a sealed manner around an engine in a conventional hydraulic excavator. Both are covered with a cover plate. The interior of the enclosure 11 is formed as an engine room 12, and an engine 13 is arranged in the engine room 12. In the exhaust system of the engine 13, a muffler 15 that is a silencer is provided in the engine exhaust pipe 14, and the enclosure 11 An ejector 16 that sucks heated air in the engine room 12 and discharges it to the outside using the engine exhaust pressure discharged outside is provided.

  The ejector 16 includes a muffler exhaust outlet pipe 17 as an inner pipe protruding from the muffler 15, and an outer pipe protruding from the enclosure 11 longer than the muffler exhaust outlet pipe 17 around the muffler exhaust outlet pipe 17. A tail pipe 18 and a suction gap 19 formed between the muffler exhaust outlet pipe 17 and the tail pipe 18 for sucking air in the engine room 12 are formed.

A large opening GH for taking in engine cooling air is provided in the lower surface portion 11b of the enclosure 11 located on the opposite side of the ejector 16 via the air passage 21 in the engine room, as shown in FIG. As described above, the opening GH is provided with an under cover UC having a large number of slit-like intake ports 22.
As shown in FIGS. 6A and 6B, these under covers UC have louvers 23 as noise suppression means for suppressing leakage of engine noise to the outside of the enclosure 11, respectively. The louver 23 is provided with each intake port 22, and the intake port 22 cuts up the under cover UC to form a large number of intake ports 22.

  On the other hand, outside the enclosure 11, as shown in FIG. 6, a hydraulic pump 24 driven by the engine 13 is continuously arranged on the right side, and a heat exchanger 25 is separately arranged on the left side. Yes. The heat exchanger 25 is configured integrally with a radiator for engine cooling water and an oil cooler for oil temperature cooling of the hydraulic circuit.

A second cooling fan 26 provided facing the heat exchanger 25 and a motor 27 for driving the second cooling fan 26 are also arranged outside the enclosure 11.
The motor 27 may be a hydraulic motor that is rotationally driven by hydraulic fluid supplied from the hydraulic pump 24, an electric motor that is rotationally driven by an in-vehicle battery, or the like. That is, by controlling the rotational speed of the electric motor 27 in accordance with the ambient temperature, etc., regardless of the rotational speed of the engine 13, the air flow rate of the second cooling fan 26 can be arbitrarily controlled, and the water temperature and oil temperature Is properly cooled.

As shown in FIG. 6, the intake port 22 is provided in the lower surface portion 11 b different from the side surface portion 11 c that receives air from the second cooling fan 26 in the enclosure 11. It is disposed at a position where it is not affected by the air flow.
Note that support structures such as the heat exchanger 25 and the electric motor 27 of the engine 13 are supported by the upper rotating body.
JP-A-11-148348

However, in the conventional structure, when the engine 13 is closed by increasing the sealing degree of the engine room 12 to reduce engine noise, the noise reduction is reduced, but the temperature in the engine room 12 becomes high and cooling is necessary. It becomes.
Further, as shown by the solid line in FIG. 6A, if the opening GH is provided at the lower part of the engine room 12 as described above for taking in the cooling air for the engine 13, proper cooling is achieved. Although obtained, noise leaks from the opening GH and the noise reduction effect is impaired.

When the under cover UC with the cut-out louver 23 shown in FIG. 6 (B) that closes the opening GH is provided, there is a slight noise reduction effect, but the engine sound is directly emitted outside the vehicle and is not sufficient. .
Also, the under cover UC with the cut-out louver 23 provided in the opening GH below the engine room 12 shown in FIG. 6 (A) is removed, and shown in FIG. 6 (A) with a two-dot chain line. The engine room 12 extends below the opening GH, and has a simple shape as shown in FIG. 2A, for example, by the swing frames 6A and 6B, the horizontal frame 8 and the like of the main frame 4. If the intake duct portion 2DC is provided, there is a great noise reduction effect, but there are problems such as an increase in cost and an excessive intake air pressure loss resulting in an insufficient amount of cooling air.

  The present invention has been made in view of the above points, and can reduce the leakage of noise generated in the engine room of the construction machine to the outside, and can easily release the heat generated in the engine room to the outside. An object of the present invention is to provide an intake duct structure for a construction machine that is connected to an engine room.

  For this reason, the intake duct structure for the engine room of the construction machine according to the first aspect of the present invention includes a horizontal frame extending in the vehicle width direction of the upper swing body of the construction machine, and extending in the front-rear direction of the upper swing body. A main frame composed of a vertical frame, an engine mounted on the main frame, an engine room in which the engine is disposed in a sealed partition wall, and an intake opening provided in a lower portion of the engine room A duct panel disposed at a distance from at least one of a vertical frame and a horizontal frame of the main frame disposed at a lower portion of the engine room, and the horizontal frame , At least one of the vertical frames, and upper and lower upper and lower frames surrounded by the duct panel and closing a vertical portion. More with constructed is characterized by comprising an intake duct connected to the intake opening.

According to a second aspect of the present invention, there is provided an intake duct structure for an engine room of a construction machine according to the present invention, wherein the vertical frame is provided with a pair of left and right vertical frames and the left and right swing frames for mounting the engine on the upper side. And the horizontal frame has a front and rear swing frame provided so as to partition the pair of first swing frames forward and backward .

According to a third aspect of the present invention, there is provided an intake duct structure for an engine room of a construction machine according to the present invention, wherein the first cooling fan is provided between the intake duct and the intake opening of the engine room. It is characterized by having.
Intake duct structure of an engine room for construction equipment according to the invention of claim 4, wherein, in the structure according to any one of claims 1 to 3, the intake opening at one end of the upper Symbol intake duct above the engine room The other end is connected to the open opening of the air intake.

According to a fifth aspect of the present invention, the intake duct structure for the engine room of the construction machine according to the present invention is the structure according to the third aspect , wherein the discharge port of the first cooling fan connected to one end of the intake duct is the one in the engine room. It is configured to be connected to the intake opening.
An intake duct structure for an engine room of a construction machine according to a sixth aspect of the present invention is the structure according to any one of the first to fifth aspects, wherein the intake duct extends substantially horizontally at a lower portion of the engine room. It is characterized by being arranged.

An intake duct structure for an engine room of a construction machine according to claim 7 of the present invention includes a horizontal frame extending in the vehicle width direction of the upper swing body of the construction machine, and a vertical frame extending in the front-rear direction of the upper swing body. A main frame comprising a frame; an engine mounted on the main frame; an engine room in which the engine is disposed in a sealed partition wall; an intake opening provided at a lower portion of the engine room; A duct panel disposed at an interval with respect to at least one of a vertical frame and a horizontal frame of the main frame disposed at a lower portion of the engine room, and the horizontal frame and the vertical frame; and upper and lower side of the upper and lower frames are surrounded by at least one of the frame and the duct panel for closing the vertical part of the outer intake Integrally constructed with the duct and the inner suction duct, one end of a suction duct and the other end connected to the intake opening of the engine room is connected to the open aperture of the air intake, the intake duct It is characterized in that it is arranged so as to be supported by the upper Symbol mainframe along the bottom of the mainframe of the engine room.

  According to the intake duct structure for the engine room of the construction machine according to the first aspect of the present invention, the horizontal frame extending in the vehicle width direction of the upper swing body of the construction machine, and extending in the front-rear direction of the upper swing body. A main frame composed of a vertical frame; an engine mounted on the main frame; an engine room in which the engine is disposed in a sealed partition wall; and an intake opening provided at a lower portion of the engine room; A duct panel disposed at a distance from at least one of a vertical frame and a horizontal frame of the main frame disposed at a lower portion of the engine room; and the horizontal frame, the vertical frame By at least one of the frames and the upper and lower upper and lower frames surrounded by the duct panel and closing the vertical portion And the intake duct connected to the intake opening, the intake duct is constituted by the vertical frame, the horizontal frame, the duct panel, and the upper and lower frames, and the main frame which is a strength member By utilizing a part of the cost, the cost can be reduced and the economy can be improved.

In addition, since the intake duct described in the above-mentioned conventional apparatus increases the intake resistance (pressure loss), a sufficient air volume cannot be obtained only by the ejector effect of the conventional muffler. If the fan is connected, the engine room can be efficiently ventilated and cooled by forced cooling.
According to the intake duct structure for the engine room of the construction machine of the present invention according to claim 2 , the intake duct is provided in the lower part of the engine by using the left and right side swing frames and the front and rear side swing frames, so that a large amount is provided in the engine room. The wind can be supplied.

According to the intake duct structure of an engine room for construction equipment of the present invention described in claim 3 is provided with the first cooling fan between the intake opening of the intake duct and d Njinrumu, the ventilation within et Njinrumu Cooling can be performed efficiently.

According to the intake duct structure of an engine room for construction equipment of the present invention described in claim 4, the first cooling fan is connected to the intake duct, to perform efficiently ventilation and cooling in by Rie Njinrumu forced cooling Can do.

According to the intake duct structure for the engine room of the construction machine according to the fifth aspect of the present invention, the discharge port of the first cooling fan is directly connected to the intake opening of the engine room so that the air is discharged from the first cooling fan. The fluid flow can be continued into the engine room, and the engine room can be efficiently ventilated and cooled.

According to the intake duct structure of an engine room for construction equipment of the present invention described in claim 6, since it is arranged to extend substantially horizontally at the bottom of the air intake duct Gae Njinrumu, engine room horizontal section min attenuates noise from can be reduced can be quiet construction machine is obtained.

According to the intake duct structure of an engine room for construction equipment of the present invention according to claim 7, in advance constitutes an intake duct, and an outer air intake duct and the inner air intake duct, a main frame located it at the bottom of the d Njinrumu if disposed along the well, the design, there is a degree of freedom.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 shows a case where the present invention is applied to a hydraulic excavator. FIG. 1 is a schematic explanatory view showing a longitudinal section seen from the rear of a hydraulic excavator in an engine room mounted horizontally on the front face of a counterweight of the excavator. FIG. 2 is a detailed schematic perspective view showing a perspective view of the main frame of the upper swing body in FIG. 1, and FIG. 2 (A) is a schematic view showing a perspective view of a pair of left and right swing frames that are vertical frames of the upper swing body of the hydraulic excavator. FIG. 2B is a perspective explanatory view, FIG. 2B is a left and right swing frame of the pair of left and right swing frames shown in FIG. 2A, a front and rear swing frame that partitions the front-rear direction spacing between the left and right swing frames, Schematic showing an intake duct portion surrounded by the inner surfaces of the upper and lower swing frames that block the vertical portion surrounded by the left and right and front and rear swing frames. FIG. 3 is a schematic explanatory view showing the structure of the intake duct portion shown in FIG. 2, FIG. 3A is a schematic explanatory view showing a perspective view of the duct panel, and FIG. FIG. 3C is a schematic explanatory view showing the intake duct portion before the cooling fan is attached, FIG. 3C is a duct panel portion shown in FIG. 3B, a duct panel shown in FIG. FIG. 3D is a schematic explanatory view showing the configuration of the intake duct to which the first cooling fan shown in FIG. 3B is attached, and FIG. 3D shows that the intake duct is composed of an outer intake duct and an inner intake duct. FIG. 4 is a schematic explanatory diagram showing a case in which the components are integrated by bolting or the like, FIG. 4 is a schematic explanatory diagram showing a state in which cooling air is supplied to the engine room via the intake duct of FIG. 3, and FIG. Cooling air into the engine room via the intake duct shown in When supplied, the noise in the engine room is propagated from the intake opening to the intake duct as shown by the dotted line in FIG. 5 to be attenuated and further bent through the bent intake duct. It is a schematic explanatory drawing which shows the state by which the sound wave of the noise which generate | occur | produced in the engine room is propagated and attenuated and is diffused outside from the said air intake opening part. 1 to 5, substantially the same members as those in the prior art shown in FIG. 6 are denoted by the same reference numerals.

  As shown in FIGS. 1 to 3, here, the case where the intake duct structure of the engine room of the construction machine of the present invention is applied to a construction machine, for example, a hydraulic excavator P will be described. Consists of an upper swing body 2, a lower traveling body 3 and a work device 5.

  A main frame 4 comprising a horizontal frame 8 extending in the left-right direction of the hydraulic excavator P of the upper swing body 2 of the construction machine P, and a vertical frame 6 extending in the front right direction of the hydraulic excavator P, As shown in FIGS. 1 and 2, the base of the upper swing body 2 is configured. An engine 13 mounted on the main frame 4 has an engine room 12 disposed in a partition wall 11 formed in a sealed state. As shown in FIGS. 1 to 3, an intake opening 12 </ b> A provided at the lower part of the engine room 12 is provided, and the vertical frame 6 and the horizontal frame 8 of the main frame 4 provided at the lower part of the engine room 12 are provided. There is provided an intake duct 12D constituted by at least one of them and a duct panel DP disposed with a space therebetween.

As indicated by a two-dot chain line in FIG. 2, for example, the one side of one side 1 a in the left-right direction of the front end portion in the front-rear direction of the construction machine and the other side 1 b on the opposite side is provided. A cab 7 is provided on the side 1a.
As shown in FIG. 1, the engine room 12 for horizontally storing the engine 13 to which the hydraulic pump 24 is connected is provided with a construction machine counter as shown by a two-dot chain line in FIG. A weight 10 is disposed on the front side of the construction machine.

A cab 7 for the operator room is provided at the front end of the upper swing body 2 as shown by a two-dot chain line in FIG. 2, and a counterweight 10 is provided at the rear end.
Further, on the main frame 4 of the upper swing body 2, as shown in FIGS. 1 and 2, opposite to the hydraulic pump 24 outside the engine room 12 disposed on the front side of the counterweight 10 of the excavator P. On the side, a cooling device and a second cooling fan 26 for cooling the cooling device are provided. For example, in the above embodiment, the cooling device is configured by a heat exchanger 25 that is configured integrally with a radiator for engine cooling water and an oil cooler for oil temperature cooling of a hydraulic circuit. You may comprise suitably combining with the condenser etc. for an air conditioning.

As shown in FIG. 1, the second cooling fan 26 and the second cooling fan 26 for operating the heat exchanger 25 are operated between the partition wall 11 c of the engine room 12 and the heat exchanger (cooling device) 25. A motor 27 is provided.
As shown by the arrows in FIG. 4, the intake duct 12D has cooling air that flows from the opening 12Q for intake air into the first intake duct portion 12Da, the second intake duct portion 12Db, and the third intake duct portion 12Dc. The discharge port 20a of the first cooling fan 20 is directly connected to the intake opening 12A of the engine room 12 so that the fluid flow continues as shown in FIG. ing.

Further, as shown in FIGS. 1 and 2, the engine 13 mounted on the upper part of the pair of left and right swing frames 6 </ b> A and 6 </ b> B provided on the upper swing body 2 of the construction machine is disposed in the partition body 11. The room 12 is provided.
As shown in FIGS. 1 and 2, an intake opening 12A provided between the pair of swing frames 6A and 6B at the lower part of the engine room 12 is provided, and the pair of left and right swing frames 6A and 6B is provided. Front and rear swing frames 6C and 6D for partitioning the front-rear direction of the construction machine between are provided. As shown in FIG. 3, the intake duct 12D according to the present invention includes an upper and lower swing frame that is surrounded by the left and right swing frames 6A and 6B and the front and rear swing frames 6C and 6D and closes the upper and lower portions. 6U and 6E are provided. In the present embodiment, the upper swing frame 6U may also be used as the fourth duct panel DP4 formed on the duct panel DP shown in FIG.

  In the embodiment, the intake duct 12D faces at least one of the left and right swing frames 6A and 6B and the front and rear swing frames 6C and 6D and the one swing frame. And a vertical portion surrounded by the duct panel DP (at least one of the first duct panel DP1, the second duct panel DP2, and the third duct panel DP3) disposed with a space therebetween An intake duct 12D composed of upper and lower swing frames 6E and 6U that close the door is connected to the intake opening 12A.

In the embodiment described above, the first intake duct 12 portion Da of the intake duct 12D is spaced from the rear swing frame 6D disposed between the pair of left and right swing frames 6A and 6B. The first duct panel DP1 and the swing frames 6E and 6U on the upper and lower sides are arranged.
The second intake duct portion 12Db is composed of a second damper panel DP2 and an upper and lower swing frames 6E and 6U that are disposed with a space therebetween so as to face the left swing frame 6A.
Further, the third intake duct portion 12Dc is constituted by a third duct panel DP3 disposed at an interval so as to face the front swing frame 6C and the upper and lower swing frames 6E and 6U. .
In the above, the case where the intake duct 12D is formed by combining the three intake ducts of the first to third intake duct portions 12Da to 12Dc to form a bent duct, but one to a plurality of intake ducts are required. In the case of the above-described embodiment, the first intake duct portion 12Da and the second intake duct portion 12Db, the second intake portion duct 12Db and the third intake duct portion 12Dc, The noise from the engine room 12 is attenuated and reduced at the bent portion between the first intake duct portion 12Da and the bent portion of the open opening 12Q.
Moreover, the said bending part is not restrict | limited to the said embodiment, It can provide suitably as needed and can perform the reduction of the said noise, and ventilation and cooling of the said engine room efficiently.

In addition, the intake duct 12D has an intake panel DP, excluding the lower duct panel DP5 (6E) indicated by a two-dot chain line in FIG. 3A, above the intake duct portion 2DC shown in FIG. 3B. Can be easily formed by fitting them as shown in FIG. 3C and attaching the lower duct panel DP6 (3E) as necessary.
Further, a first cooling fan 20 that is a cooling fan for the intake duct provided between the intake duct 12D and the intake opening 12A of the engine room 12 is provided.

  The intake duct 12D will be described in detail. The inner surfaces of the left and right swing frames 6A and 6B, the inner surfaces of the front and rear swing frames 6C and 6D, and the upper and lower swing frames 6E and 6U. A first duct panel DP1, a second duct panel DP2, and a third duct panel DP of the duct panel DP extending at a distance so as to face at least one inner surface of the inner surfaces of the duct panel DP. One end of the intake duct 12D constituted by the duct panel DP3 and the fourth and fifth duct panels DP4 and DP5 (configured to serve as the upper and lower swing frames 6E and 6U in the embodiment) is the intake air. It is connected to the opening 12A, and the other end is connected to the open opening 12Q for air intake.

The discharge port 20a of the first cooling fan 20 connected to one end of the intake duct 12D is connected to the intake opening 12A of the engine room 12 as shown in FIGS. In this way, the cooling air is efficiently supplied by being directly connected as described above.
The intake duct 12D is disposed so as to extend substantially horizontally below the engine room 12, as indicated by an arrow in FIG. 5, and noise generated in the engine room 12 passes through the intake duct 12D. It is attenuated and discharged from the opening 12Q to the outside of the engine room as shown by the arrow in FIG.

  Further, the intake duct 12D disposed between the pair of left and right swing frames 6A, 6B of the swing frame causes the noise from the intake opening 12A of the engine room 12 shown in FIG. Each of the above, which is propagated and attenuated, and further bent and horizontally extended at the third intake duct portion 12Dc, the second intake duct portion 12Db, and the first intake duct portion 12Da as shown in FIG. Since the noise is attenuated and emitted from the air intake opening 12Q shown in FIG. 5 after being attenuated at the bent duct portion, noise leakage is reduced.

The intake duct 12D attached to the intake opening 12A provided at the lower portion of the engine room 12 is composed of an outer intake duct 123a and an inner intake duct 123b as shown in FIG. For example, the air intake duct 123 may be configured such that both are integrated by a bolt BT or the like.
Further, if the intake duct 123 is disposed along the vertical frame 6 and the horizontal frame 8 of the main frame 4, the vertical frame 6, the horizontal frame 8, and the intake duct 123 serve as strength reinforcing members, respectively. Strength can be improved, and effects similar to those of the above-described embodiment can be achieved.

  Since the present embodiment is configured as described above, a larger amount of air is supplied into the engine room 12 through the intake opening 12A of the engine room 12 from the open opening 12Q of the air intake, For example, heated air in the engine room 12 is sucked from the suction gap 19 from the ejector 16, and the engine room 12 can be efficiently cooled to reduce the noise and leakage.

Further, since the conventional intake duct increases the intake resistance (pressure loss), a sufficient air volume cannot be obtained only by the ejector effect of the conventional muffler, but the first cooling fan 20 is attached to the intake duct 12D. Therefore, ventilation and cooling in the engine room 12 can be efficiently performed by forced cooling.
Further, in the above-described embodiment, the case where the engine room 12 is disposed horizontally on the front side of the counterweight 10 above the main frame 4 has been described. However, as shown in FIG. A pair of swing frames 6A and 6B shown in FIG. 2 are provided on the central side 1c of the upper swing body 2 of the excavator, which is the vertical frame 6 of FIG. In the case of the engine room 122 disposed vertically on the other side portion 1b as shown by a two-dot chain line in FIG. Can be played. At this time, the right swing frame 6B, the vertical frame 6 (corresponding to the swing frame 6A in the above embodiment), the horizontal frame 8 (corresponding to the front and rear swing frames 6C and 6D in the above embodiment), the above If the intake duct 2DC is configured by the upper and lower swing frames 6U, 6E and the like of the embodiment, the same effects as described above can be obtained.

Further, the intake duct 12D has at least one of the surfaces of the left and right swing frames 6A and 6B, the front and rear swing frames (6C) and (6D), and the upper and lower swing frames 6E and 6U as described above. By using the surface and the duct panel DP (DP1 to DP5), a part of the swing frame 6 of the strength member constituting the intake duct 12D can be used to reduce the cost and improve the economy.
The duct panel DP is configured using the swing frame, which is a strength member. However, the duct panel DP can also be a reinforcing member against resonance at the time of intake and exhaust, resonance, and the like, thereby preventing vibration.

  Moreover, although the said embodiment has demonstrated the said intake duct structure although it has the ejector 16, it is not restricted to what has an ejector, The airtight engine room and ventilation fan for increasing ventilation of the said engine room Even if the intake duct structure of the present invention is applied to an engine room equipped with ventilation means such as a sealed engine room equipped with the same function and effect as those of the above embodiment.

  The inner surfaces of the swing frames 6A to 6E constituting the intake duct and the first duct panel DP1, the second duct panel DP2, the third duct panel DP3, the fourth duct panel DP4, the fourth duct panel DP4 of the duct panel DP. For example, when a sound absorbing material DF such as felt or foamed polystyrene is attached to at least one of the inner surface and the outer surface of the five duct panel DP5, the low noise effect can be increased.

FIG. 2 is a schematic explanatory view showing a case where the present invention is applied to a hydraulic excavator and showing a longitudinal section viewed from the rear of the hydraulic excavator in the engine room mounted horizontally on the front surface of the counterweight of the hydraulic excavator. FIG. 2 is a detailed schematic perspective view showing a perspective view of a main frame of the upper swing body of FIG. 1, and FIG. 2 (A) is a schematic perspective view showing a perspective view of a pair of left and right swing frames which are vertical frames of the upper swing body of the hydraulic excavator. 2B is an explanatory diagram, FIG. 2B is a swing frame on the left and right sides of the pair of left and right swing frames shown in FIG. 2A, a swing frame on the front and rear sides that partitions the front-rear space between the left and right swing frames, It is a schematic explanatory drawing which shows the air intake duct part enclosed by each inner surface of the up-and-down side swing frame which obstruct | occludes the site | part of the up-down direction enclosed by the left and right side and front-and-back side swing frames. 3A and 3B are schematic explanatory views showing the configuration of the intake duct portion shown in FIG. 2, FIG. 3A is a schematic explanatory view showing a perspective view of the duct panel, and FIG. 3B is the intake air before the first cooling fan is attached. FIG. 3C is a schematic explanatory view showing the duct portion, FIG. 3B is a view showing the duct panel portion shown in FIG. 3B, the duct panel shown in FIG. 3A, and the first cooling shown in FIG. FIG. 3D is a schematic explanatory view showing a state in which a part of the intake duct with the fan attached is broken. FIG. 3D shows that the intake duct is composed of an outer intake duct and an inner intake duct. It is a schematic explanatory drawing which shows the case where it comprises so that it may integrate by attaching. FIG. 4 is a schematic explanatory view showing a state in which cooling air is supplied to the engine room via the intake duct of FIG. 3. When cooling air is supplied to the engine room via the intake duct shown in FIG. 4, noise in the engine room propagates from the intake opening to the intake duct as shown by the dotted line in FIG. FIG. 6 is a schematic explanatory view showing a state in which sound waves of noise generated in the engine room are propagated and attenuated through the intake duct which is attenuated and further bent and diffused to the outside through the air intake opening. . It is a schematic explanatory drawing which shows the ventilation apparatus of the conventional engine room provided in the hydraulic excavator etc. of a construction machine, (A) is the longitudinal cross-section of the engine room arrange | positioned horizontally in the front side of the counterweight of a hydraulic excavator FIG. 7B is a schematic perspective view illustrating the under cover as viewed in the direction of the arrow Y in FIG. 6A.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1a One side part 1b The other side part 1c Center side part 2 Upper revolving body 2DC Intake duct part 3 Lower revolving body 4 Main frame 5 Working device 6 Swing frame (vertical frame)
7 Cab 6A Left swing frame 6B Right swing frame 6C Front swing frame 6D Rear swing frame 6E Lower swing frame 6U Upper swing frame 8 Horizontal frame 10 Counterweight 11 Enclosure 11b as a bulkhead Lower surface 11c Side surface portion 12 Engine room 12A Intake opening portion 12D Intake duct 12Da First intake duct portion 12Db Second intake duct portion 12Dc Third intake duct portion 12Q Open opening 122 Engine room 123 Intake duct 123a Inner intake duct 123b Outer intake duct 13 Engine 14 Engine exhaust line 15 Silencer (muffler)
16 Ejector 17 Muffler exhaust outlet pipe 18 as inner pipe Tail pipe 19 as outer pipe 19 Suction gap 20 First cooling fan 20a Discharge port 21 Engine interior air passage 22 Air intake port 23 Louver 24 as noise suppression means Hydraulic pump 25 Heat exchange (Cooling device)
26 Second cooling fan 27 Motor DF Sound absorbing material DP Duct panel DP1 First duct panel DP2 Second duct panel DP3 Third duct panel DP4 Fourth duct panel GH (2DH) Opening P Hydraulic excavator UC Under cover

Claims (7)

  A main frame comprising a horizontal frame extending in the vehicle width direction of the upper swing body of the construction machine, a vertical frame extending in the front-rear direction of the upper swing body, an engine mounted on the main frame, and a sealed shape An engine room in which the engine is disposed in a partition wall formed in the vehicle body, an intake opening provided in a lower part of the engine room, and a vertical frame and a horizontal frame of the main frame disposed in the lower part of the engine room. A duct panel disposed at an interval with respect to at least one of the frames, and a vertical part surrounded by at least one of the horizontal frame and the vertical frame and the duct panel. And an intake duct connected to the intake opening. Wherein the intake duct structure of an engine room for construction equipment. The vertical frame is provided with a pair of left and right swing frames, and has a left and right swing frame on which the engine is mounted on top.
The engine room of a construction machine according to claim 1 , wherein the horizontal frame includes a front and rear swing frame provided so as to partition the pair of left and right swing frames back and forth . Intake duct structure.   The intake duct structure for an engine room of a construction machine according to claim 1 or 2, further comprising a first cooling fan provided between the intake duct and an intake opening of the engine room. One end of the upper Symbol intake duct is connected to the intake opening of the engine room, the other end characterized in that it is connected to the open aperture of the air intake, to any one of claims 1 to 3 The intake duct structure of the engine room of the described construction machine. The construction machine according to claim 3 , wherein a discharge port of the first cooling fan connected to one end of the intake duct is connected to the intake opening of the engine room. Engine room intake duct structure.   6. The intake duct structure for an engine room of a construction machine according to claim 1, wherein the intake duct is disposed so as to extend substantially horizontally at a lower portion of the engine room. A main frame comprising a horizontal frame extending in the vehicle width direction of the upper swing body of the construction machine, a vertical frame extending in the front-rear direction of the upper swing body,
An engine mounted on the mainframe;
An engine room in which the engine is disposed in a sealed partition wall; and
An intake opening provided in a lower portion of the engine room;
A duct panel disposed at an interval with respect to at least one of a vertical frame and a horizontal frame of the main frame disposed in a lower portion of the engine room;
Upper and lower upper and lower frames enclosed by at least one of the horizontal frame and the vertical frame and the duct panel and closing the vertical portion;
Integrally constructed with an outer air intake duct and the inner suction duct, one end of a suction duct and the other end connected to the intake opening of the engine room is connected to the open aperture of the air intake,
The intake duct, characterized in that it is arranged so as to be supported by the upper Symbol mainframe along the bottom of the main frame of the engine room, an intake duct structure of the engine room of the construction machine.

Images