JP2017002582A - Construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve heat balance by restraining air flowing along an engine from remaining in a machine chamber.SOLUTION: An exhaust gas post-treatment device 30 is disposed on the downstream side of an engine 25 in an airflow direction. The exhaust gas post-treatment device 30 is placed on a pedestal plate 41 of a supporting frame 40. A vent hole 44 penetrating in a vertical direction is formed on the pedestal plate 41. An air guide duct 50 is disposed beneath the pedestal plate 41. The air guide duct 50 guides the air flowing along the engine 25 in such a manner that the air passes through the vent hole 44 of the pedestal plate 41 and goes to the exhaust gas post-treatment device 30.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a construction machine.

  Conventionally, a construction machine including an engine, a blower fan that generates an air flow around the engine, and an exhaust gas aftertreatment device that processes exhaust gas from the engine is known (for example, Patent Document 1). 2).

  In Patent Document 1, a first and a second support part for supporting the exhaust gas treatment device from below, and a connection part that is arranged at a distance below the exhaust gas treatment device and connects the first and second support parts. The structure by which the opening penetrated to the axial direction of a ventilation fan was provided in the connection part is disclosed. This facilitates the flow of air around the exhaust gas aftertreatment device, and prevents foreign matter that has entered the vehicle body from accumulating around the connecting portion.

  Patent Document 2 discloses a configuration in which a house frame that is disposed on the downstream side of the engine with respect to the flow of the cooling air and supports the exhaust gas treatment device is provided, and an air guide passage through which the cooling air flows is formed in the house frame. Has been. Thereby, the flow path of cooling air is ensured and the fall of heat balance can be prevented.

Japanese Patent No. 5320348 JP 2014-148858 A

  By the way, in invention of patent document 1, 2, the air which flows along an engine is actively guided toward the opening (refer patent document 1) of a connection part, or the wind guide path (refer patent document 2) of a house frame. It is not configured. Therefore, depending on the flow of air, there is a problem that air may stay in the machine room without passing through the opening or the air guide path, which may impair the heat balance.

  This invention is made | formed in view of this point, The objective is to suppress that the air which flows along an engine stays in a machine room, and to improve a heat balance.

  The present invention relates to a lower traveling body, an upper revolving body mounted on the lower traveling body, an engine disposed in a machine room of the upper revolving body, and cooling the engine by taking air into the machine room The following solutions were taken for construction machinery equipped with a fan.

That is, the first invention is a support frame having a pedestal plate that is disposed downstream of the engine in the air flow direction and has a vent hole that penetrates in the vertical direction.
An exhaust gas aftertreatment device mounted on the pedestal plate and treating exhaust gas of the engine;
An air guide member disposed below the pedestal plate and guiding the air flowing along the engine through the vent holes of the pedestal plate toward the exhaust gas aftertreatment device; It is what.

  In the first invention, the vent hole is formed in the base plate of the support frame on which the exhaust gas aftertreatment device is placed. An air guide member is disposed below the pedestal plate, and air flowing along the engine passes through the vent hole and is guided toward the exhaust gas aftertreatment device.

  With such a configuration, the air after cooling the engine is guided by the air guide member so as to be smoothly directed to the exhaust gas aftertreatment device. The exhaust gas aftertreatment device can be cooled while being improved.

  Further, if the air after cooling the exhaust gas aftertreatment device is exhausted as it is above the machine room, noise transmitted to the surroundings of the construction machine can be reduced as compared with the case where the air is exhausted to the side of the machine room. .

  Further, when the hydraulic pump is disposed below the support frame, the exhaust gas aftertreatment device and the hydraulic pump are partitioned by the air guide member. Therefore, for example, even if oil leaks from the hydraulic pump, the air guide member can block the oil from being blown out toward the high-temperature exhaust gas aftertreatment device. That is, the wind guide member can also be used as a fireproof cover.

According to a second invention, in the first invention,
The air guide member is attached to the support frame.

  In the second invention, by attaching the air guide member to the support frame, there is no need to separately prepare a member for supporting the air guide member below the base plate, and the number of parts can be reduced.

According to a third invention, in the first or second invention,
The air guide member is
A pair of side panels disposed at intervals in a direction perpendicular to the air flow direction;
A bottom panel connecting the lower ends of the side panels;
A downstream panel that connects downstream ends of the side panels in the air flow direction and is inclined obliquely upward from the bottom panel toward the downstream side is characterized in that it is characterized in that

  In the third invention, the air guide member is configured by combining a pair of side panels, a bottom panel, and a downstream panel. Since the downstream panel is inclined obliquely upward from the bottom panel toward the downstream side, when the air after cooling the engine passes through the inside of the air guide member, the downstream panel is smoothly inclined. Can be guided upward.

According to a fourth invention, in the third invention,
At least a part of the pair of side panels is inclined in a direction in which the distance between the pair of side panels becomes narrower toward the downstream side in the air circulation direction.

  In the fourth aspect of the invention, since at least a part of the pair of side panels is inclined in a direction in which the interval is narrowed, the air after cooling the engine passes through the inside of the air guide member. The panel can be smoothly guided upward by the inclination of the panel and the inclination of the downstream panel.

According to a fifth invention, in any one of the first to fourth inventions,
A hydraulic pump connected to the downstream side of the air flow direction in the engine,
The air guide member divides the machine chamber into an engine chamber in which the engine is disposed and a pump chamber in which the hydraulic pump is disposed.

  In the fifth invention, the machine room is partitioned into the engine room and the pump room by the air guide member. Thereby, for example, even if oil leaks from the hydraulic pump, it is possible to block the oil from blowing out toward the high-temperature engine by the air guide member. That is, the wind guide member can also be used as a fireproof cover.

A sixth invention is any one of the first to fifth inventions,
The pedestal plate includes a frame main body and a plurality of partition plates that divide the inside of the frame main body into a lattice shape to partition the plurality of vent holes.

  In 6th invention, the base board is formed in what is called a grating shape by the frame main body and the some partition plate which partitions off the inside of the frame of a frame main body in a grid | lattice form. Thereby, while ensuring the rigidity of a base plate and supporting an exhaust-gas aftertreatment apparatus stably, a some vent hole can be provided.

  According to the present invention, the air after cooling the engine is guided by the air guide member so as to smoothly go to the exhaust gas aftertreatment device, so that the air stays in the machine room and the heat balance is improved. And the exhaust gas aftertreatment device can be cooled.

It is a perspective view which shows the structure of the construction machine which concerns on this embodiment. It is a rear view which shows the internal structure of an upper turning body. It is a side view when a support stand and an air guide duct are seen from the upstream of the air distribution direction. It is a bottom view which shows the structure of a support stand and an air guide duct. It is a bottom view which shows the structure of a support stand.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. It should be noted that the following description of the preferred embodiment is merely illustrative in nature and is not intended to limit the present invention, its application, or its use. In each figure, the up / down and front / rear / left / right directions are indicated by arrows. Unless stated otherwise, the vertical direction will be described according to the directions indicated by these arrows.

  As shown in FIG. 1, the construction machine 10 includes a crawler-type lower traveling body 11 and an upper revolving body 12 that is rotatably mounted on the lower traveling body 11. The upper swing body 12 includes an attachment 13, a cab 14, a machine room 15, and the like.

  The construction machine 10 of the present embodiment is a small turning type, and the upper turning body 12 is configured to be relatively small so that the turning radius is small, and the outline of the rear part of the upper turning body 12 is a plan view. It is formed in an arc shape.

  The attachment 13 is installed in the front part of the upper turning body 12, and is configured by a boom 13a, an arm 13b, a bucket 13c, and the like. Each of the booms 13a and the like operates in conjunction with the expansion and contraction of the hydraulic cylinder 13d that is hydraulically controlled, and performs operations such as excavation. The operation of the boom 13a and the like is performed in the cab 14.

  The cab 14 is a rectangular box-shaped cab, and is installed in the left front portion of the upper swing body 12 adjacent to the attachment 13. The machine room 15 is provided at the rear part of the upper swing body 12. Inside the machine room 15, an engine 25 (see FIG. 2), a hydraulic pump 26, and the like are housed in a dense state.

  The periphery of the machine room 15 is covered with a machine room cover 16 and a counterweight 17. The counterweight 17 is for securing a front-rear balance with the attachment 13, and is mounted on the rear part of the upper swing body 12. The counterweight 17 extends in a curved manner along the arcuate outline of the rear part of the upper swing body 12 and covers the machine room 15 from the rear side of the vehicle to the left and right sides. The machine room cover 16 divides the machine room 15 by covering the periphery of the engine 25 and the like together with the counterweight 17.

  As shown in FIG. 2, a bottom plate 20 is disposed below the upper swing body 12. The machine room 15 is provided on the bottom plate 20. An intake port 16 a for taking outside air into the machine room 15 is formed in the upper left part of the machine room cover 16. An exhaust port 16 b for exhausting the taken-in outside air is formed in the upper right portion of the machine room cover 16.

  An exhaust cylinder 18 that exhausts the exhaust gas of the engine 25 to the outside is provided at the right rear corner of the upper surface of the machine room cover 16. The exhaust cylinder 18 protrudes upward from the machine room cover 16 with the opening directed rearward (see FIG. 1).

  In addition to the engine 25, a radiator 21, a fan 22, a hydraulic pump 26, and an exhaust gas aftertreatment device 30 are accommodated in the machine room 15. In this construction machine 10, a radiator 21, a fan 22, an engine 25, and a hydraulic pump 26 are arranged side by side in order from the upstream side in the air flow direction. The exhaust gas aftertreatment device 30 is disposed above the hydraulic pump 26.

  The engine 25 is installed on a pedestal 27 provided on the bottom plate 20 via an engine mount 28. The engine 25 is housed inside the machine room 15 so that its drive shaft faces the left-right direction of the bottom plate 20.

  The radiator 21 is formed in a vertically long rectangular shape, and is disposed such that the core surface faces the left-right direction. Cooling water for engine cooling flows through the radiator 21 and exchanges heat with outside air taken in from the intake port 16a.

  The fan 22 is connected to the left end portion of the drive shaft of the engine 25 and is disposed between the engine 25 and the radiator 21. The hydraulic pump 26 is connected to the right end portion of the drive shaft of the engine 25 and is located on the right side portion of the machine room 15.

  As shown by the arrow line in FIG. 2, in this construction machine 10, when the engine 25 is driven, a flow of air from the left side to the right side is formed inside the machine room 15, and the refrigerant 21 exchanges heat with the air. As a result, the engine 25 and the like are cooled. Specifically, the air is taken into the machine chamber 15 from the intake port 16 a by the rotation of the fan 22. The taken-in air passes through the radiator 21, absorbs the heat of the cooling water flowing through the radiator 21, becomes hot air, and is discharged out of the machine room 15 through the exhaust port 16b.

  The hydraulic pump 26 is connected in the middle of a hydraulic oil circulation path used for hydraulic control. The hydraulic pump 26 is driven by the engine 25 and sends hydraulic oil to a circulation path with a high pressure.

  The exhaust gas aftertreatment device 30 is for treating the exhaust gas of the engine 25, and is disposed above the hydraulic pump 26 while being supported by the support frame 40. A specific configuration of the support base 40 will be described later.

  The exhaust gas aftertreatment device 30 includes a DPF device 31 (Diesel particulate filter) as a filter device and an SCR device 32 (Selective Catalytic Reduction). The DPF device 31 and the SCR device 32 are connected in series along the exhaust path from the engine 25 to the exhaust pipe 18. The DPF device 31 and the SCR device 32 are arranged above the hydraulic pump 26 in a state where they are juxtaposed in the left-right direction.

  The DPF device 31 is for collecting particulate matter in the exhaust gas, and an oxidation catalyst is provided inside the cylindrical casing. The particulate matter collected by the DPF device 31 is self-combusted by high-temperature exhaust gas, so that the DPF device 31 is regenerated.

  A urea aqueous solution that is a reducing agent aqueous solution is injected into the exhaust gas that has passed through the DPF device 31 by an injector (not shown). The urea aqueous solution is thermally decomposed by high-temperature exhaust gas to become ammonia, and is supplied to the SCR device 32 on the downstream side together with the exhaust gas as a reducing agent.

  The SCR device 32 reduces and purifies nitrogen oxides in exhaust gas using ammonia as a reducing agent, and an ammonia reduction catalyst is provided inside the cylindrical casing. Ammonia is oxidized and detoxified by the ammonia reducing catalyst. The exhaust gas reduced and purified by the SCR device 32 is exhausted from the exhaust cylinder 18 to the outside.

  By the way, the exhaust gas aftertreatment device 30 and the support frame 40 are disposed in the machine chamber 15 on the downstream side of the engine 25 in the air flow direction. Therefore, when the air flowing along the engine 25 is directed to the exhaust port 16b, the air may collide with the base plate 41 of the support frame 40 and may not be exhausted sufficiently from the exhaust port 16b. In this case, air stays in the machine room 15 and the heat balance is impaired.

  Therefore, in the present embodiment, by devising the configuration of the support frame 40, air is prevented from staying in the machine room 15 and can be smoothly exhausted.

  Specifically, as shown in FIGS. 2 to 5, the support base 40 includes a base plate 41 on which the DPF device 31 and the SCR device 32 are placed, and three supports that extend downward from the corners of the base plate 41. Leg 45.

  The pedestal plate 41 includes a frame main body 42 and a plurality of partition plates 43 that partition the inside of the frame main body 42 into a lattice shape. A plurality of ventilation holes 44 penetrating in the vertical direction are defined in the base plate 41 by a plurality of partition plates 43. Thereby, the base plate 41 is formed in what is called a grating shape.

  A support bracket 33 is provided below the DPF device 31 and the SCR device 32. A mount member 34 is sandwiched between the support bracket 33 and the base plate 41, and the DPF device 31 and the SCR device 32 are placed on the base plate 41 and fixed.

  The support legs 45 are fixed to the base 27 and the bottom plate 20 by extending downward from the corners of the base plate 41. The support legs 45 are erected at three positions on the front, rear, left and right in the vicinity of the hydraulic pump 26.

  Below the pedestal plate 41, an air guide duct 50 as an air guide member is disposed. The air guide duct 50 guides the air flowing along the engine 25 so as to pass through the vent holes 44 of the base plate 41 toward the exhaust gas aftertreatment device 30.

  The air guide duct 50 is formed by combining a pair of side panels 51, a bottom panel 52, and a downstream panel 53. A pair of side panel 51 is arrange | positioned at intervals in the direction (vehicle front-back direction) orthogonal to an air distribution direction. The right end portion of the side panel 51 is inclined in a direction in which the distance between the side panels 51 becomes narrower toward the downstream side in the air circulation direction. The pair of side panels 51 are attached to the base plate 41 of the support base 40 by, for example, welding.

  The bottom panel 52 connects the lower ends of the pair of side panels 51. The downstream panel 53 connects the right end portions of the pair of side panels 51. Further, the downstream panel 53 is inclined obliquely upward from the right end of the bottom panel 52 toward the right.

  Here, since the left end side of the air guide duct 50 is open, the air after cooling the engine 25 flows into the air guide duct 50 from this opening. The air passing through the inside of the air guide duct 50 is smoothly guided upward by the inclination of the right end of the pair of side panels 51 and the inclination of the downstream panel 53, and passes through the vent holes 44 of the base plate 41. And flows toward the exhaust gas aftertreatment device 30.

  As described above, since the air after cooling the engine 25 is guided smoothly toward the exhaust gas aftertreatment device 30 by the air guide duct 50, the heat balance is suppressed by preventing the air from staying in the machine room 15. And the exhaust gas aftertreatment device 30 can be cooled.

  In addition, since the air after cooling the exhaust gas aftertreatment device 30 flows directly upward of the machine room 15 and is exhausted from the exhaust port 16b, the construction machine is compared with the case where the air is exhausted to the side of the machine room 15. The noise transmitted to around 10 can be reduced.

  Further, the air guide duct 50 is disposed below the pedestal plate 41 to partition the exhaust gas aftertreatment device 30 and the hydraulic pump 26. Further, the air duct 50 is disposed so as to partition the machine room 15 into an engine room in which the engine 25 is disposed and a pump room in which the hydraulic pump 26 is disposed.

  Thereby, for example, even if oil leaks from the hydraulic pump 26, the air guide duct 50 can block the oil from being blown out toward the high-temperature exhaust gas aftertreatment device 30 or the engine 25. That is, the air guide duct 50 can also be used as a fireproof cover.

<< Other Embodiments >>
About the said embodiment, it is good also as following structures.

  In the present embodiment, a wind guide duct 50 that combines a pair of side panels 51, a bottom panel 52, and a downstream panel 53 as a wind guide member that guides air flowing along the engine 25 toward the exhaust gas aftertreatment device 30. Although the configuration using is described, it is not limited to this form. For example, an inclined plate inclined obliquely upward toward the downstream side in the air flow direction is disposed below the pedestal plate 41 so that air is guided toward the exhaust gas aftertreatment device 30 along the inclined plate. You may do it.

  In the present embodiment, the air guide duct 50 is attached to the pedestal plate 41 of the support base 40. However, the present invention is not limited to this form. For example, the shape of the air guide duct 50 may be devised so that the pump bracket (not shown) for connecting the hydraulic pump 26 to the engine 25 and the air guide duct 50 can be fastened together.

  As described above, the present invention is extremely useful because it has a highly practical effect of suppressing the air flowing along the engine from staying in the machine room and improving the heat balance. Industrial applicability is high.

DESCRIPTION OF SYMBOLS 10 Construction machine 11 Lower traveling body 12 Upper revolving body 15 Machine room 22 Fan 25 Engine 26 Hydraulic pump 30 Exhaust gas post-processing device 40 Support stand 41 Base plate 42 Frame main body 43 Partition plate 44 Ventilation hole 50 Wind guide duct (wind guide member) )
51 Side panel 52 Bottom panel 53 Downstream panel

Claims (6)

A lower traveling body, an upper revolving body mounted on the lower traveling body, an engine disposed in a machine room of the upper revolving body, and a fan that takes air into the machine room and cools the engine A construction machine equipped with,
A support frame having a pedestal plate disposed on the downstream side in the air flow direction from the engine and having a vent hole penetrating in the vertical direction;
An exhaust gas aftertreatment device mounted on the pedestal plate and treating exhaust gas of the engine;
An air guide member disposed below the pedestal plate and guiding the air flowing along the engine through the vent holes of the pedestal plate toward the exhaust gas aftertreatment device; And construction machinery. In claim 1,
The construction machine according to claim 1, wherein the air guide member is attached to the support frame. In claim 1 or 2,
The air guide member is
A pair of side panels disposed at intervals in a direction perpendicular to the air flow direction;
A bottom panel connecting the lower ends of the side panels;
A construction machine comprising: a downstream panel connecting downstream ends of the side panels in the air flow direction and inclined obliquely upward from the bottom panel toward the downstream side. In claim 3,
At least a part of the pair of side panels is inclined in a direction in which the distance between the pair of side panels becomes narrower toward the downstream side in the air circulation direction. In any one of claims 1 to 4,
A hydraulic pump connected to the downstream side of the air flow direction in the engine,
The construction machine characterized in that the air guide member divides the machine room into an engine room in which the engine is arranged and a pump room in which the hydraulic pump is arranged. In any one of claims 1 to 5,
The pedestal plate has a frame main body and a plurality of partition plates that divide the inside of the frame main body in a lattice shape to partition the plurality of vent holes.

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