JP4387789B2 - Engine room structure of construction machinery - Google Patents

Description

  The present invention has a main engine room that houses an engine installed with a gap on the floor, and a pump room that houses a hydraulic pump adjacent to the main engine room, and operates the engine cooling water and the hydraulic pump. The present invention relates to a structure of an engine room of a construction machine in which cooling air for cooling oil flows from a main engine room toward a pump room.

  Today, various construction machines such as traveling construction machines such as excavators and wheel loaders and stationary construction machines such as cranes are used in various fields such as construction sites, harbors, factories, and the like. The structure of these construction machines is, for example, a hydraulic excavator that is a traveling construction machine, as shown in FIG. 7, a lower traveling body 101, and an upper revolving body 102 that is pivotably disposed above the lower traveling body 101. The upper revolving unit 102 is provided with three parts including a work device 103 that performs various work.

  Construction machines are generally used in harsh environments such as excavation of rocks in dams, tunnels, rivers, roads, etc., and demolition of buildings and buildings, but in such environments they are used for equipment such as engines and hydraulic pumps. The applied load is high, and the engine temperature and hydraulic oil temperature are likely to rise. Therefore, in these construction machines, as shown in FIG. 8, a cooling package 104 made up of a relatively large-capacity radiator, oil cooler, or the like is provided in the flow path of the cooling air generated by the fan. Engine cooling water and hydraulic oil are cooled (for example, refer to Patent Document 1).

In the example shown in FIG. 8, external air (cooling air) is sucked from the upper openings 109 and 110 of the radiator room 102A in which the cooling package 104 is installed by the rotation of the fan 105 driven by the engine 106. However, when passing through the core of the cooling package 104 having the fin structure, the engine cooling water and the hydraulic oil are cooled.
Then, on the downstream side of the cooling package 104 in the main engine room 102B in the fan axial flow direction (left and right direction in FIG. 8), there is an opening 111 formed of a plurality of openings formed in a mesh shape or a louver shape on the upper surface. The openings 112 each having a single opening are provided on the lower surface thereof.

The pump room 102C in which the hydraulic pump 108 is installed is provided with an opening 113 on the upper surface and an opening 114 on the lower surface. These openings 113 and 114 are openings of the main engine room 102B. Like 111, it consists of a plurality of openings formed in a mesh shape or a louver shape.
A part of the cooling air that has become high temperature by cooling the engine coolant or hydraulic oil is discharged to the outside from the exhaust openings 111 and 112 of the main engine room 102B. Further, a part of the cooling air flows into the pump room 102C through a gap between the connecting portion 108a of the hydraulic pump 108 with the engine 106 and the firewall 130 that partitions the main engine room 102B and the pump room 102C. Then, the air is discharged to the outside through the exhaust openings 113 and 114 of the pump room 102C.

  Here, the opening 111 on the upper surface is formed with a relatively large width in the fan axial flow direction, whereas the opening 112 on the lower surface provides an opening on the lower surface due to the structure of the main engine room 102B. Since it is difficult, the opening area is smaller than the opening 111 on the upper surface. For this reason, in the engine room shown in FIG. 8, the cooling air does not flow smoothly under the engine 106, which reduces the cooling performance of the cooling package 104.

  In order to sufficiently cool engine cooling water and hydraulic oil, use a cooling package with higher cooling performance or increase the opening area provided in the engine room 102 to improve the circulation of cooling air However, the higher the cooling performance, the larger the cooling package and the higher the cost. The larger the opening area, the more engine noise and fan noise leaked to the outside of the machine (increased noise). The problem arises.

By the way, in the construction machine, the air flow discharged from the cooling fan in the engine room has almost no component in the axial direction of the fan, and the component in the centrifugal direction and the component in the swirl direction (hereinafter collectively referred to as the centrifugal / swirl direction component). ) Has been confirmed to be the main component.
Therefore, Patent Document 2 discloses a construction machine as shown in FIG. 9 as a technique for improving the efficiency of exhausting cooling air from the engine room. In this construction machine, an inlet 131 for cooling air is provided on the upper surface of the engine room 130, and a cooling air discharge passage (fan air flow channel, fan air flow duct) is formed on the upper surface and both side surfaces (vehicle front and rear surfaces) of the engine room 130. ) 132 to 134 are provided, and the inlet (the left end portion in FIG. 9) of the cooling air passage is positioned near the outer periphery of the cooling fan. With such a configuration, the cooling air blown from the cooling fan in the centrifugal / swirl direction is efficiently discharged from a small opening, and an increase in noise from the engine room 130 is prevented.
Japanese Utility Model Publication No. 3-83324 JP 2001-193102 A

However, even in the technique of Patent Document 2 described above, no attention is paid to the circulation of the cooling air below the engine in the engine room. For this reason, it is desired to improve the flowability of the cooling air below the engine so that the cooling air can be discharged to the outside of the machine more efficiently.
The present invention has been devised in view of such problems, and an object thereof is to provide an engine room structure for a construction machine that can improve cooling air discharge efficiency.

In order to achieve the above object, an engine room structure for a construction machine according to claim 1 of the present invention includes a main engine room for housing an engine installed with a gap on the floor, and adjacent to the main engine room. An engine room of a construction machine having a pump room for accommodating a hydraulic pump, and cooling air for cooling the cooling water of the engine and the hydraulic oil of the hydraulic pump flowing from the main engine room toward the pump room A communication port provided in the vicinity of the gap between the floor surface and the engine and communicating with the main engine room and the pump room; and standing on the floor surface; a main rail extending in a direction, the air passage of the continuous opening provided in the pump room and the inlet of the cooling air, provided to the pump room in order to discharge the cooling air to the outside Is configured to include the evacuation port,該風Ro utilizes the main rail is formed in a shape bent downward toward the flow direction downstream side of the cooling air flowing through the該風Ro The cooling air outlet is disposed below the engine, and the outlet of the cooling air is set lower than the lower edge of the cooling air inlet.

The engine room structure of the construction machine according to claim 2 of the present invention includes a main engine room that houses an engine installed with a gap on the floor, and a pump room that houses a hydraulic pump adjacent to the main engine room. The engine room of a construction machine in which cooling air for cooling the cooling water of the engine and the hydraulic oil of the hydraulic pump flows from the main engine room toward the pump room, A communication port provided close to the gap between the floor surface and the engine to communicate the main engine room and the pump room; a main rail standing on the floor surface and extending in the front-rear direction of the construction machine; An air passage provided in the main engine room with the communication port as an outlet for the cooling air and an exhaust port provided in the pump room for discharging the cooling air to the outside of the machine. Ete configured,該風Ro utilizes the main rail is formed in a shape curved upwardly toward the flow direction downstream side of the cooling air flowing through the該風Ro, lower than the engine And the cooling air inlet is set at a position lower than the lower edge of the cooling air outlet.

The engine room structure of the construction machine according to claim 3 of the present invention is the engine room structure of the construction machine according to claim 1 or 2, wherein the predetermined angle at which the air passage is bent is set to 90 degrees. It is characterized by.
The engine room structure of the construction machine according to claim 4 of the present invention is the engine room structure of the construction machine according to any one of claims 1 to 3, wherein the air path is circulated through the air path. It is characterized in that a constricted portion whose cross-sectional area gradually decreases toward the downstream side of the cooling air flow direction is provided .

In the engine room structure of the construction machine according to the first aspect of the present invention, a main engine room that houses an engine installed with a gap in the floor, and a pump room that houses a hydraulic pump adjacent to the main engine room. An air passage is provided in the pump room with the communication port for communication as an inlet for cooling air.
The air passage has a shape bent downward toward the downstream side in the flow direction of the cooling air flowing through the air passage, and the outlet of the cooling air is set at a position lower than the lower edge of the inlet of the cooling air. Therefore, even if oil leaks from the hydraulic pump in the form of a mist, this mist-like oil is prevented from entering the main engine room linearly by being blocked by the wall surface forming the air passage. Oil is prevented from entering and diffusing into the main engine compartment. On the other hand, the cooling air is smoothly guided to the pump room by this air passage below the engine, and then discharged from the discharge port provided in the pump room to the outside of the machine.

Therefore, according to the engine room structure of the construction machine according to the first aspect of the present invention, the cooling air discharge efficiency is improved while preventing the mist-like oil leaked from the hydraulic pump from diffusing in the engine room. There is an advantage that can be improved.
In the engine room structure of the construction machine according to the second aspect of the present invention, a main engine room that houses an engine installed with a gap on the floor, and a pump room that houses a hydraulic pump adjacent to the main engine room. An air passage is provided in the main engine room with the communication port used for communication as an outlet for cooling air.

  This air passage has a shape bent upward toward the downstream side in the flow direction of the cooling air flowing through the air passage, and the inlet of the cooling air is set at a position lower than the lower edge of the outlet of the cooling air. Therefore, similarly to the engine room structure of the construction machine according to claim 1, even if oil leaks from the hydraulic pump in the form of a mist, the mist of oil is blocked by the wall surface forming the air passage and linearly. Intrusion into the main engine room is prevented, and mist-like oil is prevented from entering and diffusing into the main engine room. On the other hand, the cooling air is smoothly guided to the pump room by this air path below the engine, and then discharged from the discharge port provided in the pump room to the outside of the machine.

  Therefore, according to the engine room structure of the construction machine of the second aspect of the present invention, the mist-like oil leaked from the hydraulic pump diffuses in the engine room as in the engine room structure of the construction machine of the first aspect. There is an advantage that the cooling air discharge efficiency can be improved while preventing this.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 6, the arrow X in the drawing indicates the front-rear direction of the construction machine (hereinafter also referred to as the engine room width direction), and the arrow Y in the drawing indicates the left-right direction of the construction machine (hereinafter, Also referred to as the fan axial flow direction).
In the following embodiments, examples in which the present invention is applied to a hydraulic excavator as a construction machine will be described.

(1) 1st Embodiment The whole structure of the construction machine concerning 1st Embodiment of this invention is demonstrated with reference to FIG. FIG. 1 is a schematic perspective view showing the overall configuration of a construction machine.
The construction machine includes three parts: a lower traveling body 1, an upper revolving body 2 that is disposed on the upper side of the lower traveling body 1, and a work device 3 that is provided on the upper revolving body 2 and performs various operations. It consists of Among these, the upper swing body 2 is provided with a counterweight 2A behind the machine body, and an engine room 2B is arranged in front of the machine body of the counterweight 2A.

Next, the overall structure of the engine room as the first embodiment of the present invention will be described with reference to FIG. FIG. 2 is a schematic cross-sectional view of the engine room 2B as viewed from the front of the machine body.
In the engine room 2B, an engine 26 is installed with its crankshaft directed in the left-right direction Y of the machine body. An axial flow type cooling fan 25 is installed on the right side of the engine 26 in FIG. This cooling fan is installed in such a posture that its axial flow direction coincides with the left-right direction Y of the fuselage, and the cooling air is circulated through the cooling air passage formed by the internal space of the engine room 2B. (Here, the cooling air is sent to the left side in FIG. 2). Here, the cooling fan 25 is an engine drive type mechanically coupled to the engine crankshaft, but is not limited to this, and may be a hydraulic drive type.

A cooling package 24 including a radiator, an oil cooler, and the like is installed on the upstream side in the fan axial direction of the cooling fan 25 (right side in FIG. 2), and downstream in the fan axial direction of the engine 26 (left side in FIG. 2). Is provided with a hydraulic pump 27.
The hydraulic pump 27 is driven by the engine 26, is mechanically connected to the engine crankshaft, and is installed with a gap with respect to the engine room floor. The oil (working oil) sent out from the hydraulic pump 27 is fed to a predetermined location of the construction machine via a hydraulic hose 27a (only a part is shown in FIG. 2).

  The interior of the engine room 2B is partitioned between the cooling package 24, the engine 26, and the hydraulic pump 27, and the radiator room 2Ba in which the radiator (cooling package 24) is installed, the engine 26, and the cooling fan 25 are installed. The main engine room 2Bb and the pump room 2Bc in which the hydraulic pump 27 is installed are divided.

  The main engine room 2Bb and the pump room 2Bc are substantially partitioned by a main rail 50 and an upper firewall 28A which will be described later. Here, the main engine room 2Bb and the upper firewall 28A are located upstream of the main rail 50 and the upper firewall 28A in the fan axial direction. The room 2Bb is referred to as a pump room 2Bc on the downstream side of the main rail 50 and the upper firewall 28A in the fan axial direction.

  The engine room ceiling surface 22 is provided with an opening (suction port) 22c for facing the radiator room 2Ba and sucking cooling air from the outside of the machine, while discharging the cooling air facing the main engine room 2Bb. And a mesh-like opening (formed as an assembly of a plurality of relatively small openings) for discharging cooling air facing the pump room 2Bc. (Discharge port) 22d is provided.

Here, the discharge port 22a is located at the same position as the cooling fan 25 with respect to the outer periphery of the cooling fan 25, that is, the fan axial flow direction (= the left-right direction of the machine body). Specifically, the position is set immediately below the cooling fan 25 (immediately downstream with respect to the fan axial flow direction Y).
A bulge (bulging portion) 22b is attached to the outside of the upper body wall surface 22 so as to cover the discharge port 22a provided in the main engine room 2Bb.

  The bulge 22b has a structure in which the end on the side of the radiator room 2Ba is closed while the end on the side of the pump room 2Bc is opened, and the cooling air discharged from the engine room 2B through the discharge port 22a After being deflected in the direction opposite to the cooling air inlet 22c provided in the radiator room 2Ba by the horizontal direction (including not only the horizontal direction but also the substantially horizontal direction) and the fan axial flow direction Y by 22b, To be discharged.

On the other hand, the engine room floor 23 is provided with a cooling air outlet 23a facing the main engine room, and a cooling air outlet 23b facing the pump room 2Bc. The discharge port 23a is a single opening, and the discharge port 23b is a louver or mesh opening.
In addition, a pair of main rails 50 and 51 extending in the front-rear direction of the construction machine are erected on the floor surface 23. The main rails 50 and 51 are juxtaposed at a predetermined interval, extend in the longitudinal direction X of the machine body, and cooperate to support the work device 3 (see FIG. 1) so that it can swing up and down.

  Although it is a general configuration, the engine 26 and the oil pan 26a are mounted on the main rails 50 and 51 via a support member (not shown) and above the floor surface 23 (with a gap in the floor surface 23). E) is installed. As a result, the cooling air flows through a space formed below the engine 26 and the oil pan 26a. Facing this space, that is, below the oil pan 26a, the exhaust port 23a is provided between the main rails 50 and 51, and a part of the cooling air flowing below the engine 26 is It is discharged from the discharge port 23a to the outside of the machine.

As described above, the engine room 2B is divided into three chambers 2Ba, 2Bb, and 2Bc. The main engine room 2Bb that houses the engine 26 and the pump room 2Bc that houses the hydraulic pump 27 are the main rail 50. The upper firewall 28A is arranged above the upper wall so as to be substantially partitioned.
Here, the periphery of the upper firewall 28A will be described with reference to FIGS. 3 (a) and 3 (b). 3A and 3B are diagrams showing a configuration around the upper firewall 28A, in which FIG. 3A is a schematic front view (viewed from the pump room 2Bc), and FIG. 3B is a schematic arrow view (engine). The ceiling surface, the airframe front surface, and the airframe rear surface forming the room 2B are removed).

  The upper firewall 28A has a substantially quadrangular flat plate shape, is disposed above the main rail 50 and behind the engine 26, and has a hole through which a hydraulic pump 27 connected to the engine crankshaft is inserted. 28Aa is provided. The upper firewall 28A has an upper edge connected to the ceiling surface 22, one side edge connected to the wall surface in front of the fuselage, the other side edge connected to the wall surface in the rear of the fuselage, and a lower edge connected to the duct member 29. It is connected to the.

  The upper firewall 28A is disposed at a predetermined distance from the upper end 50a of the main rail 50, and a gap between the upper firewall 28A and the main rail 50 is defined between the main engine room 2Bb and the pump room 2Bc. Is formed in the vicinity of the gap between the engine room floor 23 and the engine 26.

  The duct member 29 is installed in the pump room 2Bc, its upper edge is connected to the upper firewall 28A, one side edge is connected to the wall surface in front of the aircraft, and the other side edge is connected to the wall surface in the rear of the aircraft. Yes. Further, the duct member 29 is shaped like a plate-like material folded in two, and is a quadrangular flat plate-like first portion 291 and second portion 292 that are perpendicular to each other (including substantially perpendicular). The first part 291 is directed upward and the second part 292 is directed downward, and the first part 291 is horizontal and the second part 292 is vertical.

At the upper edge of the first part 291, a pair of right and left connection allowances 291 a are provided to the first part 291. These connection allowances 291a are bolted to the upper firewall 28A on both sides of the hole 28Aa, whereby the first portion 291 and thus the duct member 29 are fixed to the upper firewall 28A.
On the other hand, a quadrangular cutout 292a that is long in the longitudinal direction X of the aircraft is formed at the lower center of the second portion 292. The upper edge 292c of the notch 292a is set below the lower edge of the communication port 30a (that is, the upper edge 50a of the main rail 50). Further, on the lower edge of the second portion 292, connection margins 292b perpendicular to the second portion 292 are provided on the left and right sides of the notch 292a. These connection margins 292b are bolted to the engine room floor 23. Thus, the second portion 292 and thus the duct member 29 are fixed to the engine room floor 23.

  Due to the structure of the upper firewall 28A and the duct member 29, the communication port 30a for communicating the main engine room 2Bb and the pump room 2Bc between the main rail 50 and the upper firewall 28A is provided with the engine room floor 23 and the engine. 26 is formed in the vicinity of the gap (facing the gap) with respect to 26, and further, an air passage 30 for cooling air having the communication port 30a as an inlet and a notch (opening) 292a provided in the duct member 29 as an outlet is provided. The duct member 29, the main rail 50, both sides of the engine room and the engine room floor 23 are formed near the gap between the engine room floor 23 and the engine 26 (facing the gap). .

  From the above configuration, as shown in FIG. 2, the air passage 30 is arranged between the first portion 291 and the second portion 292 toward the downstream side in the circulation direction of the cooling air flowing through the air passage 30 ( A curved portion 31 that is bent downward by a predetermined angle (in this case, 90 degrees) (from the main engine room 2Bb to the pump room 2Bc) is formed, and the main rail 50 and the engine are arranged downstream of the curved portion 31 in the cooling air flow direction. Between the room floor surface 23, a curved portion 32 that is bent horizontally from the engine room 2Bb toward the pump room 2Bc is formed.

The air passage 30 has an arrangement in which the inlet 30a and the outlet 292a are completely displaced in the vertical direction, and thus has a curved portion 31, and the inlet 30a is connected to the outlet 292a or the outlet 292a to the inlet 30a. It is a labyrinth-like structure that is difficult to see. Such a structure is called a labyrinth structure.
Then, in the engine room structure shown in this FIG. 2, by operating the cooling fan 25, incorporated as cooling air from the suction port 22c as indicated by arrows F ₁ to the engine room 2B (cooling air passage) After the outside air passes through the cooling package 24 as indicated by arrows F _{2 to} F ₄ , a part of the outside air is discharged from the bulge 22b above the engine 26 to the outside as indicated by arrows F ₅ and F _6. It has become. Further, the other part of the cooling air passes below the engine 26 as indicated by an arrow F ₇ , and exits from the exhaust port 23 a provided in the engine room floor 23 as indicated by an arrow F ₈ . Or flows into the pump room 2Bc through the air passage 30 as indicated by arrows F ₉ , F ₁₀ , F ₁₁ , and from the discharge ports 22d and 23b provided in the pump room 2Bc (the discharge port 23b is mainly used) To be discharged.

The cooling air cools the cooling water and the hydraulic oil of the hydraulic pump 27 when passing through the cooling package 24.
The communication port 30a and the air passage 30 are disposed below the engine 26. This is because the cooling performance of the cooling package 24 has been lowered due to poor circulation of the cooling air below the engine 26 in the past, so the communication port 30a and the air passage 30 are arranged below the engine 26, The flowability of the cooling air below the engine 26 is improved.

  Further, the fan 25 and the engine 26 are configured to be substantially shielded from the pump room 2Bc and the outside of the machine by the wall surfaces (the duct member 29 and the main rail 50) that form the upper firewall 28A and the air passage 30, and therefore the pump room 2Bc. The volume of engine noise and fan sound leaking outside the machine can be maintained at the same level as the conventional engine room structure in which the main engine room and pump room are partitioned from the ceiling surface to the floor surface by the firewall. ing.

The engine room structure of the construction machine as the first embodiment of the present invention is configured as described above, and has the following operations and effects.
When a small hole (pinhole) is generated in the hydraulic hose 27a of the hydraulic pump 27, a part of the oil pumped through the hydraulic hose 27a is sprayed from the pinhole.
The upper part of the engine 26 where the high-temperature body (for example, the muffler 26b and its temperature is around 150 ° C.) is partitioned from the pump room 2Bc by the upper firewall 28A as usual, so that the mist-like oil is in the main engine room. Intrusion into 2Bb is prevented. In addition to the muffler, a high-temperature heating element disposed above the engine 26 includes a turbocharger that is not installed here. The temperature of the turbocharger is around 300 ° C.

  In addition, an air passage 30 that communicates the main engine room 2Bb and the pump room 2Bc is provided below the engine 26. The air passage 30 is provided below the main engine room 2Bb toward the pump room 2Bc. It is said to be bent in shape. Therefore, in order for the mist-like oil to enter the main engine room 2Bb, the air passage 30 has a labyrinth structure and rises from the pump room 2Bc toward the main engine room 2Bb (in this case, the main rail 50). You have to get over. Although it is foggy, it is difficult for oil having a higher specific gravity than cooling air to get over the main rail 50 against the gravity (and cooling air flow). Further, the mist-like oil that has entered the air passage 30 has a relatively high specific gravity, and therefore has a strong straight running force due to inertia, and the air passage 30 has a shape that bends sharply (perpendicularly). It cannot be bent and collides with a part of the outer wall surface (in this case, the main rail 50) that forms the air passage 30 inside. The oil that has collided with the main rail 50 is condensed and dropped on the floor surface 23 in the pump room 2Bc through the main rail 50.

For this reason, the oil is held in the pump room 2Bc.
On the other hand, the cooling air flowing under the engine 26 is smoothly guided from the main engine room 2Bb to the pump room 2Bc by the air passage 30, and discharged from the outlet of the pump room 2Bc to the outside of the apparatus. Wind can be discharged efficiently.
Thus, according to the engine room structure of the construction machine of the present embodiment, it is possible to improve cooling air discharge efficiency while preventing oil from entering and diffusing from the pump room 2Bc into the main engine room 2Bb. As a result, the total opening area of the cooling air discharge port provided in the engine room 2B can be reduced as compared with the conventional one, and the engine sound and fan sound (that is, noise) leaking from the cooling air discharge port to the outside of the machine can be reduced. It is possible to reduce the cost or reduce the cost by adopting a cooling fan having a smaller rated air volume than the conventional one or a cooling package smaller than the conventional one.

  In the example shown in FIGS. 2 and 3A and 3B, since the firewall 28A is disposed above the main rail 50, the air passage 30 is formed with the main rail 50 as one of the components. Although configured, the firewall 28A is not necessarily disposed above the main rail 50. When the firewall 28A is not disposed above the main rail 50, it is conceivable that an air path is configured as shown in FIGS. 4 (a) and 4 (b) and FIGS. 5 (a) and 5 (b), for example. .

FIG. 4 is a diagram showing the configuration of the first reference example of the air passage, (a) is a schematic front view thereof (a view seen from the pump room 2Bc side), (b) is a schematic perspective view thereof, FIGS. 5A and 5B are diagrams showing a configuration of a second reference example of the air passage, where FIG. 5A is a schematic front view thereof (viewed from the pump room 2Bc side), and FIG. 5B is a schematic perspective view thereof. is there. In FIGS. 4B and 5B, the ceiling surface, the front surface of the body, and the rear surface of the body that form the engine room 2B are removed. The parts already described in the examples shown in FIGS. 2 and 3 (a) and 3 (b) are denoted by the same reference numerals in FIGS. 4 (a) and 4 (b) and FIGS. 5 (a) and 5 (b). It is.

  The air passage 30A shown in FIGS. 4 (a) and 4 (b) is different from the air passage 30 shown in FIGS. 2 and 3 (a) and 3 (b) in that a lower firewall 28B is used instead of the main rail 50. It differs in that it is used. The lower firewall 28B has an upper edge connected to the lower edge of the upper firewall 28A, and both side edges in the engine room width direction are connected to the front surface or the rear surface of the body forming the engine room 2B, and the lower edge is It is connected to the engine room floor 23. The air passage entrance 30a is formed by a slit-like opening provided in the lower firewall 28B and extending in the engine room width direction.

The other configuration is the same as that of the air passage 30, and the description thereof is omitted.
The air passage 30B shown in FIGS. 5 (a) and 5 (b) is obtained by replacing the duct member 29 with a duct member 39 having a substantially box-type structure in comparison with the air passage 30A shown in FIGS. 4 (a) and 4 (b). Composed. Each of the duct members 39 includes a quadrilateral ceiling wall 391, side walls 392, 393, and a rear wall 394. The side walls 392 and 393 extend in a direction perpendicular to the ceiling wall 391 from the front edge of the ceiling wall 391 or the rear edge of the body, and the rear wall 394 is downstream in the fan axial direction Y of the ceiling wall 391. It extends perpendicularly to the ceiling wall 391 from the edge.

  The duct member 39 is vertically attached to the firewalls 28A and 28B so that the ceiling wall 391 faces upward and the ceiling wall 391 is in a horizontal posture, and the ceiling wall 391 is a slit provided in the firewalls 28A and 28B. Attached to the firewalls 28A and 28B so as to be above the cylindrical opening (airway entrance) 30a. Further, the heights of the side walls 392, 393, and the rear wall 394 are set so that the lower end of the side walls 392, 393, and the rear wall 394 is positioned below the slit-shaped opening 30a when the duct member 39 is attached to the lower firewall 28B. ing.

With such a configuration, the air passage 30B is formed between the lower firewall 28B, the duct member 39, and the engine room floor 23. In the air passage 30 </ b> B, a bent portion that is bent vertically is formed between the ceiling wall 391 and the rear wall 394 of the duct member 39.
Since the other configuration is the same as that of the air passage 30A, description thereof is omitted.

(2) Second Embodiment A construction machine according to a second embodiment of the present invention will be described with reference to FIG. In addition, about the member already demonstrated by the said 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.
FIG. 6 is a schematic cross-sectional view of the engine room 2B as viewed from the front of the machine body. As shown in FIG. 6, in the engine room structure of the present embodiment, the duct member 29 is attached to the upper firewall 28A and the main rail 50 on the opposite side and in the front-rear direction with respect to the first embodiment. That is, the duct member 29 has an upper connection allowance 291a connected to the lower portion of the upper firewall 28A on the main engine room 2Bb side with the first portion 291 facing upward and the second portion 292 facing downward. The lower connection allowance 292b is connected to the floor surface 23 in the main engine room 2Bb. Accordingly, the engine room floor 23, the duct member 29, the upper firewall 28A, and the main rail 50 are connected to the air passage 30 of the first embodiment between the upper firewall 28A and the main rail 50. An air passage 30C having a symmetrical shape with respect to 30a is formed. That is, an air passage 30C is formed in which the opening 292a provided in the second portion 292 of the duct member 29 is used as an inlet for cooling air and the communication port 30a is used as an outlet for cooling air.

Since other structures are the same as those in the first embodiment, description thereof is omitted.
Since the engine room as the second embodiment of the present invention is configured as described above, the cooling air is guided from the main engine room 2Bb to the pump room 2Bc by the air passage 30C. Further, even if a pinhole is generated in the hydraulic hose 27a in the pump room 2Bc and mist-like oil injected from the pinhole enters the air passage 30C, the air passage 30C has a curved portion. Therefore, this mist-like oil collides with and adheres to the wall surface (in this case, the second portion 292 of the duct member 29) forming the air passage 30C and drops onto the floor surface 23. Therefore, the mist-like oil can be prevented from diffusing in the main engine room 2Bb (particularly above the engine 26 having a high-temperature body such as the muffler 26a).

  Therefore, according to the engine room structure as the present embodiment, the same effect as in the first embodiment can be obtained.

(3) Others Although the embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.
For example, in the said 1st Embodiment, the duct member 29 is provided in the pump room 2Bc side of the communicating port 30a which connects main engine room 2Bb and pump room 2Bc, and the air path 30 is formed, In the said 2nd Embodiment, The duct member 29 is provided on the main engine room 2Bb side of the communication port 30a to form the air passage 30C, but the duct member 29 is attached to the main engine room 2Bb side and the pump room 2Bc side of the communication port 30a, respectively. It is good also as a structure which has 30C together.

  In addition, the air passages 30 and 30A to 30C may be provided with a throttle portion whose cross-sectional area gradually decreases toward the downstream side in the flow direction of the cooling air flowing from the main engine room 2Bb to the pump room 2Bc. By providing such a throttle portion, in the air passages 30 and 30A to 30C, the mist-like oil is supplied to the pump room without substantially reducing the flow of the cooling air flowing from the main engine room 2Bb to the pump room 2Bc. It is possible to effectively prevent the flow from 2Bc to the main engine room 2Bb.

It is a typical perspective view showing the whole construction machine composition concerning a 1st embodiment of the present invention. It is typical sectional drawing by the front view of an engine room which shows the engine room structure of the construction machine as 1st Embodiment of this invention. It is a figure which shows the periphery structure of the firewall concerning 1st Embodiment of this invention, (a) is the typical front view, (b) is the typical arrow view. It is a figure which shows the structure of the periphery of the firewall concerning the 1st reference example of 1st Embodiment of this invention, (a) is the typical front view, (b) is the typical arrow view. . It is a figure which shows the structure of the periphery of the firewall concerning the 2nd reference example of 1st Embodiment of this invention, (a) is the typical front view, (b) is the typical arrow view. . It is typical sectional drawing by the front view of an engine room which shows the engine room structure of the construction machine as 2nd Embodiment of this invention. It is a typical perspective view which shows the whole structure of the conventional construction machine. It is a figure which shows the internal structure of the engine room of the conventional construction machine, Comprising: It is typical sectional drawing of the engine room seen from the body front. It is a typical perspective view which shows the structure of the cooling device of the conventional construction machine.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Lower traveling body 2 Upper turning body 2A Counterweight 2B Engine room 2Ba Radiator room 2Bb Main engine room 2Bc Pump room 3 Working device 22 Engine room ceiling surface 23 Engine room floor surfaces 22a, 22d, 23a, 23b Exhaust port 22b Bulge 22c Inhalation Port 24 Cooling package 25 Cooling fan 26 Engine 27 Hydraulic pump 28A, 28B Firewall 29 Duct member 30, 30A, 30B, 30C Air passage 31, 32 Curved portion 30a Communication port (air passage inlet or air passage outlet)
50, 51 Main rail 292a Notch (airway exit or airway entrance)

Claims (4)

A main engine room for accommodating an engine installed with a gap in the floor, and a pump room for accommodating a hydraulic pump adjacent to the main engine room, and cooling water for the engine and hydraulic oil for the hydraulic pump A structure of an engine room of a construction machine in which cooling air for cooling the air flows from the main engine room toward the pump room,
A communication port provided close to the gap between the floor surface and the engine, and communicating the main engine room and the pump room;
A main rail standing on the floor and extending in the front-rear direction of the construction machine;
An air passage provided in the pump room with the communication port as an inlet of the cooling air;
A discharge port provided in the pump room for discharging the cooling air out of the machine;
The air passage is formed in a shape bent downward by a predetermined angle toward the downstream side in the flow direction of the cooling air flowing through the air passage using the main rail , and disposed below the engine. An engine room structure for a construction machine, wherein the outlet of the cooling air is set at a position lower than the lower edge of the inlet of the cooling air. A main engine room for accommodating an engine installed with a gap in the floor, and a pump room for accommodating a hydraulic pump adjacent to the main engine room, and cooling water for the engine and hydraulic oil for the hydraulic pump A structure of an engine room of a construction machine in which cooling air for cooling the air flows from the main engine room toward the pump room,
A communication port provided close to the gap between the floor surface and the engine, and communicating the main engine room and the pump room;
A main rail standing on the floor and extending in the front-rear direction of the construction machine;
An air passage provided in the main engine room with the communication port as an outlet for the cooling air;
A discharge port provided in the pump room for discharging the cooling air out of the machine;
The air passage is formed in a shape bent upward by a predetermined angle toward the downstream side in the flow direction of the cooling air flowing through the air passage using the main rail , and disposed below the engine. An engine room structure for a construction machine, wherein the cooling air inlet is set at a position lower than the lower edge of the cooling air outlet. The engine room structure for a construction machine according to claim 1 or 2, wherein the predetermined angle of bending of the air passage is set to 90 degrees. 4. The throttle according to claim 1, wherein the air passage is provided with a constriction portion whose cross-sectional area gradually decreases toward the downstream side in the flow direction of the cooling air flowing through the air passage. Engine room structure of construction machinery .

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