JP4347194B2 - Engine room heat exhaust structure for work machines - Google Patents

Description

  The present invention relates to an engine room heat exhaust structure of a work machine.

As a prior art of an intake device for an engine room of a work machine, 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. (For example, see Patent Document 1)
JP-A-11-148348

However, in such a conventional technique, when the sealing degree of the engine room is increased in order to reduce engine noise, noise is reduced, but the temperature in the engine room tends to be high.
Further, if an opening is provided in the lower part of the engine room for taking in cooling air for the engine, proper cooling can be obtained, but noise may leak from this opening.

The present invention has been made in view of the above problems, the working machine noise generated in the engine room of an engine mounted on it to so that it is possible to reduce the leaking outside the engine room heat exhaust The purpose is to provide a structure .

Therefore, the engine room heat exhaust structure for a work machine according to the first aspect of the present invention is provided in an engine mounted on a vehicle of the work machine, an engine room in which the engine is disposed, and a rear portion of the work machine. a counterweight that is, an intake or exhaust openings of the upper portion provided at a position counterweight facing the rear side partition wall of the engine room, an intake or exit discharge provided in an intake or exhaust openings of the upper An intake or exhaust duct is formed by a fan and a recess provided in the counterweight connected to the upper intake or exhaust opening , and the recess is a counterweight attaching / detaching recess provided in the counterweight. of the opening it is characterized that you have been closed by the closing member.

Engine heat exhaust structure for a working machine of the present invention according to claim 2, in the configuration of claim 1, wherein the lower suction opening cooling air of the engine room is provided in a lower portion of the intake duct of the counterweight The fluid that has been sucked into the upper intake opening provided in the rear partition wall of the engine room facing the counterweight through the intake duct and that has cooled the engine room is supplied to the upper cover of the engine room . It is characterized by being configured to be discharged from the discharge hole .

Engine heat exhaust structure for a working machine of the present invention according to claim 3, during the construction of claim 1 or 2, wherein, from the upper inlet opening of the engine compartment side to the lower inlet opening of the counterweight-side It is characterized by comprising the intake duct having a least one point bent portion also of the connected intake duct.

According to the working machine in the engine room heat exhaust structure of the present invention according to claim 1, an engine mounted on a working machine, the engine room which the engine is disposed, is provided at the rear of the working machine counter Connected to the weight, an upper intake opening provided at a position facing the counterweight on the rear partition wall of the engine room, an intake fan provided in the upper intake opening, and the upper intake or exhaust opening Since the intake duct is formed by the recess provided in the counterweight, the engine operating noise in the engine room is attenuated by the intake or exhaust duct of the counterweight recess having a large mass to reduce the noise. Can do.
In addition, according to the engine room heat exhaust structure of the working machine of the first aspect of the present invention, since the concave portion is a counterweight attaching / detaching concave portion provided in the counterweight, when not used as a counterweight attaching / detaching concave portion, The intake duct can be easily formed, and the upper intake opening can be easily used as a space for installing the intake fan.
According to the engine room heat exhaust structure of the working machine of the present invention as defined in claim 1, since the opening of the recess is closed by the closing member, the noise leaks from the engine room to the intake duct. Can be prevented.

According to the working machine in the engine room heat exhaust structure of the present invention described in claim 2, in the configuration of claim 1, wherein a lower intake cooling air of the engine room is provided in the lower portion of the intake duct of the counterweight The fluid that has been sucked into the upper intake opening provided in the rear partition wall of the engine room that is introduced from the opening and faces the counterweight via the intake duct is cooled and the engine room is cooled . since it is configured so as to be discharged from the discharge hole of the upper cover, the cooling of the engine room efficiently can be carried out, using a suction fan provided in the upper inlet opening for the outside air intake, further engine operation noise Can be prevented.

According to the engine room heat exhaust structure of the work machine of the present invention described in claim 3, in the configuration of claim 1 or 2, from the upper intake opening on the engine room side to the lower intake opening on the counterweight side since with the intake duct having a least a bent portion of one location also of the air intake duct connected between, the bent portion of the least one point even in the intake duct of the aircraft outside the noise is attenuated The noise leakage can be reduced.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic explanatory view showing a perspective view of an engine room heat exhaust structure of a work machine according to the present invention, and FIG. 2 shows the above operation showing a state in which cooling air is supplied to the engine room via the intake duct of the counterweight of FIG. It is a schematic explanatory drawing of a machine rear part, (A) is a schematic top view of the counterweight shown in FIG. 1, (B) is a schematic front view of the arrow Y of FIG. 2 (A), (C) is FIG. ) Is a schematic explanatory view showing a cross section taken along line 2C-2C, FIG. 3 shows different operating states corresponding to FIG. 2, and FIGS. 3 (A) to 3 (C) are shown in FIG. A) to (C) each having the same configuration, and as indicated by the dotted line, the noise in the engine room is propagated from the upper intake opening to the intake or exhaust duct and attenuated, and is attenuated from the lower intake opening. It is a schematic explanatory drawing which shows the state discharge | released outside.

FIG. 1 shows the vicinity of an engine room 12 in a hydraulic excavator 2 that is a work machine. A horizontal engine 13 is provided along the vehicle width direction on the front side of a counterweight 10 mounted along the vehicle width direction of the hydraulic excavator. It has been. Hereinafter, in the present invention, the same part is used for intake and exhaust, but first, the case where it is used for intake will be described.
As shown by a two-dot chain line in FIG. 1, a partition wall 11 formed of a rear partition wall 11b, a left partition wall 11c, a right partition wall 11d, an upper partition wall 11e, and a lower partition wall 11f. An engine room 12 in which a transverse engine 13 is disposed is provided.

An upper intake opening 30A and an intake fan 36A provided in the upper intake opening 30A are disposed on the rear partition wall 11b of the engine room 12 at a position facing the counterweight 10.
When the intake fan 36A provided in the upper intake opening 30A is used for outside air intake, engine operating noise can be prevented from being released.

  That is, as indicated by a solid line 23A in FIG. 2, the engine room cooling air is supplied from a lower intake opening 30B provided at the lower portion of the intake duct on the counterweight 10 side of the intake duct 22 provided in the counterweight 10. As shown in FIG. 1, the intake cooling air is introduced into the intake duct 22 from the upper intake opening 30A of the rear partition wall 11b of the engine room 12 as shown in FIG. 2 It is guided from the intake duct 22b and flows to the first intake duct 22a, is turned by the first intake duct 22a at the upper opening of the intake duct 22, and flows into the engine room 12 through the upper opening 30A.

  The engine room cooling air 23A supplied from the upper intake opening 30A flows in as shown in FIGS. 1 and 2 to cool the engine 13, and the cooling air that has cooled the engine 13 passes through the engine indoor air passage 23A. Along with the atmospheric fluid in the engine room 12, the air is discharged from a plurality of gaps 19 in the engine compartment partition wall 11, for example, the gaps (openings) 19 in the upper partition wall body, and the engine room 12 is efficiently ventilated and cooled. Is called.

As described above, the engine room 12 of the engine room heat exhaust structure of the working machine according to the present invention is supplied with cooling air from the intake duct 22 and efficiently cools the engine room 12. At this time, the engine room 12 is generated in the engine room 12. the operating noise when examined operating noise of the engine 13, etc. are dotted as indicated by the arrow 23b, the first bent portion is propagated from the engine room in the upper air intake opening 30A in the first intake duct 22a in FIG. 3 the duct The noise is attenuated by being turned against the wall 22ca and propagated to the second intake duct 22b and is released into the atmosphere through the lower intake opening 30B and is expanded.

Further, as described above, if the intake fan 36A provided in the upper intake opening 30A is used for intake of outside air as required, it is possible to further prevent engine operation noise from being released.
Further, as shown in FIG. 3, the suction fan 36A of the upper inlet opening above the discharge fan 36 A
3C, the fluid in the engine room 12 is discharged from the engine room and the duct wall 22ca of the recess 20 provided in the counterweight 10 having a large mass, as indicated by a two-dot chain line in FIG. flows to the exhaust fan 36 is deflected is made to dispose the a second intake duct 22b so as to hit the, reduces the noise is attenuated by the air intake duct 22, can be released into the atmosphere from the lower intake opening 30B .
In this embodiment, the counterweight attaching / detaching concave portion 20 provided with the up / down hydraulic cylinder of the attaching / detaching device for attaching / detaching the counterweight provided at the rear portion of the work machine is effectively used.

The upper opening 22c of the recess 20 provided in the counterweight 10 provided in the rear part of the vehicle of the work machine is closed by the closing member 21a, and the recess 20 for attaching / detaching the counterweight is connected to the upper intake opening 30A to connect the intake duct 22 Since it formed, an air intake duct can be formed easily.
In addition, since it is the lower air intake opening 30B or al emitted from the engine room 12 through an intake duct 22, it is possible to prevent leakage of operating noise of the engine 13 of the engine compartment 12.

  Further, the upper intake opening provided in the rear side partition body 11b of the engine room 12 introduced from the lower intake opening 30B of the intake duct 22 provided in the counterweight 10 and facing the counterweight 10 through the intake duct 22 Since the intake fan 36A provided in the upper intake opening 30A is used for outside air intake, the engine operating noise can be prevented from being released.

In addition, since the use counter weights detachable recess 2 0 provided on the counterweight 10 of the working machine in the intake duct 22, when the engine room 12 is a narrow lot, the normal is minimum for maintenance Since only the space is ensured, the upper intake opening 30A is provided, and the installation space for the upper intake fan 36A can be ensured. Therefore, the above-described effects can be effectively achieved.

Further, as shown in FIG. 2, since the upper opening 22c of the recess 20 in which the attaching / detaching device for attaching / detaching the counterweight is disposed in the counterweight 10 provided in the work machine is closed by the closing member 21a, Noise leakage from the intake duct 22 can be prevented.
Further, when the detachable recess 20 is used as shown in FIG. 1, the recessed partition member 10F of the counterweight 10 at the upper portion of the intake fan 36A provided in the upper opening 30A is made to be the size of the intake fan 36A. The shape is appropriately selected and provided.

Further, 10G shown in FIG. 1 also serves as a guide member that blocks heat from the muffler muffler 15 and forms an engine cooling air passage 23A for cooling air from the intake fan 36A.
In the present embodiment, the case of the horizontal engine has been described. However, even in the case of the vertical engine, the same operational effects as described above can be obtained.

It is a schematic explanatory drawing which shows the perspective view of the engine room heat exhaust structure using the counterweight of this invention. 2A and 2B are schematic explanatory views showing a state in which cooling air is supplied to the engine room via the intake duct of the counterweight of FIG. 1, (A) is a schematic plan view of the counterweight shown in FIG. 1, and (B) is FIG. 2. (A) The schematic front view of the arrow Y of (A), (C) is a schematic explanatory drawing which shows the cross section which follows the 2C-2C line | wire of FIG. 2 (B). FIG. 3 is a diagram corresponding to FIG. 2, showing an operation state different from FIG. 2, in which (A) is a schematic plan view of the counterweight shown in FIG. 1, and (B) is an arrow Y view in FIG. (C) is a schematic explanatory drawing which shows the cross section which follows the AA line of FIG. 3 (B).

Explanation of symbols

2 Work machine 10 Counterweight 11 Partition body 11b Rear side partition body 11c Left side partition body 11d Right side partition body 11e Upper side partition body 11f Lower side partition body 12 Engine room 13 Engine 15 Silencer (muffler)
19 Gap (discharge hole)
20 recess 22 air intake duct 22c upper opening 23A engine compartment air passage 30A upper intake opening 30B the lower intake opening 36A suction fan (or emissions fans)

Claims (3)

An engine mounted on the work machine, an engine room in which the engine is disposed , a counterweight provided at a rear portion of the work machine, and a rear partition wall body of the engine room at a position facing the counterweight. An upper intake or exhaust opening provided, an intake or exhaust fan provided in the upper intake or exhaust opening, and a recess provided in the counterweight connected to the upper intake or exhaust opening an intake or exhaust duct is formed by is provided,
The concave portion is a counterweight attaching / detaching concave portion provided in the counterweight,
An engine room heat exhaust structure for a working machine, wherein an upper opening of the recess is closed by a closing member . Provided in the engine compartment rear bulkhead of the cooling air of the engine room to face the counterweight through the intake duct is introduced from the lower air intake opening provided in the lower portion of the intake duct of the counter-wait is sucked into the upper air intake opening, a fluid cooled the engine compartment, characterized in that it is configured to be discharged from the emissions holes in the upper cover of the engine room, working according to claim 1, wherein Mechanical engine room heat exhaust structure . The intake duct having at least one bent portion of the intake duct connected between the upper intake opening on the engine room side and the lower intake opening on the counterweight side. The engine room heat exhaust structure of the work machine according to 1 or 2 .

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