JP2023135911A - Work machine - Google Patents

Abstract

To provide a work machine capable of properly cooling an electronic component mounted at an upper part of a post-treatment device.SOLUTION: A work machine has: a building having an internal space; an engine stored in the internal space; a cooling fan stored in the internal space on one side in a width direction of the building from the engine, and generating cooling wind directing toward the other side in the width direction; a post-treatment device stored in the internal space on the other side in the width direction from the engine and treating exhaust gas of the engine; and an electronic component mounted at an upper part of the post-treatment device. The building has: a front wall for partitioning a front face of the inner space; a rear wall partitioning a rear face of the internal space; a side wall arranged on the other side in the width direction from the post-treatment device; and an upper face cover partitioning an upper face of the internal space and formed with an exhausting port for exhausting the cooling wind flowing along the front wall and the side wall from the internal space. The exhausting port is positioned at a rear side of the electronic component, with at least a part thereof positioned under an upper end of the electronic component.SELECTED DRAWING: Figure 6

Description

The present invention relates to a working machine equipped with a post-processing device.

Conventionally, after-treatment devices for treating exhaust gas from engines of construction machinery include an EGR (Exhaust Gas Recirculation) device that recirculates a portion of the exhaust gas to the intake side, and a DPF (DPF) that collects particulate matter in the exhaust gas. Diesel particulate filters, NOx catalysts that decompose nitrogen oxides (NOx) into water and nitrogen, and the like are known.

In recent years, as high-level exhaust gas regulations regarding engines have been applied, various electronic components such as various sensors and controllers are installed in aftertreatment devices. However, when these electronic components are housed in a high-temperature engine building, sufficient heat radiation measures are required. As a technique for improving the air flow within the engine compartment, a configuration is known in which cooling air generated by a cooling fan is guided from below to above the aftertreatment device (see, for example, Patent Document 1).

JP2017-002582A

However, when electronic components are attached to the upper part of the post-processing device, with the configuration of Patent Document 1, it is difficult to supply cooling air to the electronic components hidden behind the post-processing device. Therefore, it cannot be said that heat radiation measures for electronic components are sufficient.

The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide a working machine that can appropriately cool electronic components attached to the upper part of a post-processing device.

In order to achieve the above object, the present invention provides a building having an internal space, an engine accommodated in the internal space, an engine housed in the internal space on one side in the width direction of the building from the engine, and a a cooling fan that generates cooling air directed toward the other side in the width direction; an aftertreatment device that is housed in the internal space on the other side of the width direction from the engine and processes exhaust gas from the engine; and the aftertreatment device. In the work machine, the building includes a front wall defining a front surface of the interior space, a rear wall defining a rear surface of the interior space, and an electronic component attached to an upper part of the device. a side wall disposed on the other side in the width direction; and a top cover defining an upper surface of the internal space and having an exhaust port formed therein for exhausting cooling air flowing along the front wall and the side wall from the internal space. The exhaust port is located behind the electronic component and at least partially below the upper end of the electronic component.

According to the present invention, it is possible to obtain a working machine that can appropriately cool electronic components attached to the upper part of a post-processing device. Note that problems, configurations, and effects other than those described above will be made clear by the description of the embodiments below.

1 is a side view of a hydraulic excavator that is a representative example of a working machine according to the present invention. FIG. 3 is a plan view showing the inside of the engine building. FIG. 3 is a left side view showing the inside of the engine building. FIG. 3 is a perspective view of the engine building with the engine compartment cover in the closed position. FIG. 3 is a perspective view of the engine building with the engine compartment cover in the open position. It is a figure showing the positional relationship of electronic components and an exhaust port in the front-back direction and the left-right direction. It is a figure showing the positional relationship of an electronic component and an exhaust port in the up-down direction and the left-right direction.

Embodiments of a working machine according to the present invention will be described with reference to the drawings. FIG. 1 is a side view of a hydraulic excavator 1 that is a representative example of a working machine according to the present invention. Note that front, rear, left, and right in this specification are based on the viewpoint of an operator who rides and operates the hydraulic excavator 1, unless otherwise specified.

The hydraulic excavator 1 includes a lower traveling body 2 and an upper rotating body 3 supported by the lower traveling body 2. The lower traveling body 2 and the upper rotating body 3 are examples of vehicle bodies. The lower traveling body 2 includes a pair of left and right crawlers. Then, when the rotation of the travel motor (not shown) is transmitted and the pair of left and right crawlers rotate, the hydraulic excavator 1 travels. However, the lower traveling body 2 may be a wheeled type instead of a crawler.

The upper revolving body 3 is rotatably supported by the lower traveling body 2. The upper rotating body 3 is rotated relative to the lower traveling body 2 by receiving the driving force of a rotating motor (not shown). The upper revolving body 3 includes a revolving frame 5 serving as a base, a front working device 4 attached to the center of the front end of the revolving frame 5 so as to be rotatable in the vertical direction, and a cab (operating machine) disposed on the front left side of the revolving frame 5. It mainly includes a seat) 7 and a counterweight 6 disposed at the rear end of a rotating frame 5.

The front working machine 4 includes a boom 4a supported on the upper revolving structure 3 so as to be able to raise and lower, an arm 4b that is swingably supported at the tip of the boom 4a, and a bucket that is swingably supported at the tip of the arm 4b. 4c, and hydraulic cylinders 4d, 4e, and 4f that drive the boom 4a, arm 4b, and bucket 4c. The counterweight 6 is used to balance the weight with the front working machine 4, and is a heavy object having an arcuate shape when viewed from above.

The cab 7 has an internal space in which an operator who operates the hydraulic excavator 1 rides. In the interior space of the cab 7, a seat for an operator to sit on and an operating device operated by the operator seated on the seat are arranged. When an operator riding in the cab 7 operates the operating device, the lower traveling body 2 travels, the upper rotating body 3 turns, and the front working machine 4 operates.

Further, the upper revolving body 3 supports an engine building 10 (building). The engine building 10 is supported by the swing frame 5 behind the front working machine 4 and the cab 7 and in front of the counterweight 6. The engine building 10 has an internal space that accommodates components for operating the hydraulic excavator 1 (for example, an engine 21, a cooling fan 22, an aftertreatment device 23, a hydraulic pump 24, etc.).

FIG. 2 is a plan view showing the inside of the engine building 10. FIG. 3 is a left side view showing the inside of the engine building 10. As shown in FIG. Note that the left-right direction is an example of "the width direction of the engine building 10", the left side is an example of "one side in the width direction", and the right side is an example of "the other side in the width direction". However, the left and right sides may be reversed.

As shown in FIGS. 1 to 3, the internal space of the engine building 10 is defined by a front wall 11, a rear wall 12, a bottom wall 13, a left wall 14, a right wall 15, and a top cover 16. ing. More specifically, the front wall 11 defines the front surface of the interior space, the rear wall 12 defines the rear surface of the interior space, the bottom wall 13 defines the bottom surface of the interior space, and the left wall 14 defines the left surface of the interior space. The right side wall 15 defines the right side of the interior space, and the top cover 16 defines the top surface of the interior space.

Further, as shown in FIG. 2, the internal space of the engine building 10 is separated by a partition wall 17 into an engine room 18 and a pump room 19. The engine chamber 18 and the pump chamber 19 are adjacent to each other in the left-right direction with the partition wall 17 in between. More specifically, the pump chamber 19 is located to the right of the engine chamber 18. The engine compartment 18 mainly accommodates an engine 21, a cooling fan 22, a heat exchanger (not shown), and an aftertreatment device 23. Further, the pump chamber 19 mainly accommodates a hydraulic pump 24 .

The engine 21 is arranged on the right side of the heat exchanger and the cooling fan 22 and on the left side of the aftertreatment device 23. The engine 21 generates driving force for operating the hydraulic excavator 1 (more specifically, the cooling fan 22 and the hydraulic pump 24) by mixing and burning fuel and air. Furthermore, the heat generated by the engine 21 causes the inside of the engine compartment 18 to become high temperature.

The cooling fan 22 is arranged on the right side of the heat exchanger and on the left side of the engine 21. The cooling fan 22 is rotated by the driving force of the engine 21 to generate cooling air directed to the right inside the engine building 10 . More specifically, as shown in FIG. 1, the left side wall 14 is formed with an intake port 14a that penetrates in the thickness direction. As the cooling fan 22 rotates, the air that has entered the engine compartment 18 through the intake port 14a flows to the right as cooling air.

The heat exchanger is arranged on the left side of the cooling fan 22. The heat exchanger includes a radiator that exchanges heat between the cooling water that has cooled the engine 21 and the cooling air generated by the cooling fan 22 and supplies the same to the engine 21 again. Further, the heat exchanger may include an intercooler that cools air compressed by a supercharger (turbocharger), a hydraulic oil cooler that cools hydraulic oil stored in a hydraulic oil tank, and the like.

The aftertreatment device 23 is arranged on the right side of the engine 21. The aftertreatment device 23 purifies exhaust gas discharged from the engine 21. The after-treatment device 23 includes, for example, an EGR (Exhaust Gas Recirculation) device that recirculates part of the exhaust gas to the intake side, a DPF (Diesel Particulate Filter) that collects particulate matter in the exhaust gas, and a nitrogen oxide (NOx) device. ) into water and nitrogen.

The post-processing device 23 includes an electronic component 25 . The electronic component 25 is mounted, for example, on a substrate attached to the post-processing device 23. The electronic component 25 includes, for example, a sensor that detects the state of the post-processing device 23, a controller that controls the operation of the post-processing device 23, and the like.

The electronic component 25 is attached to the upper part of the post-processing device 23. That is, the electronic component 25 faces the top cover 16 (engine compartment cover 16a described below) at a predetermined interval in the vertical direction. In other words, the electronic component 25 is arranged between the post-processing device 23 and the top cover 16 in the vertical direction. The electronic component 25 is attached to the right side of the post-processing device 23. That is, the electronic component 25 faces the partition wall 17 at a predetermined distance in the left-right direction. In other words, the electronic component 25 is arranged between the post-processing device 23 and the partition wall 17 in the left-right direction.

The hydraulic pump 24 supplies hydraulic oil stored in a hydraulic oil tank (not shown) to the hydraulic actuators (travel motor, swing motor, hydraulic cylinders 4d, 4e, 4f) by receiving the driving force of the engine 21. do. As a result, the lower traveling body 2 travels, the upper rotating body 3 turns, and the front working machine 4 operates.

FIG. 4 is a perspective view of the engine building 10 with the engine compartment cover 16a in the closed position. FIG. 5 is a perspective view of the engine building 10 with the engine compartment cover 16a in the open position. As shown in FIGS. 4 and 5, the top cover 16 includes an engine chamber cover 16a and a pump chamber cover 16b.

The engine compartment cover 16a defines the upper surface of the engine compartment 18. Further, the engine compartment cover 16a according to the present embodiment is attached so as to be openable and closable by a hinge (not shown) provided at the rear end. As shown in FIG. 4, when the engine compartment cover 16a is placed in the closed position, the upper surface of the engine compartment 18 is closed. As shown in FIG. 5, when the engine compartment cover 16a is placed in the open position, the upper surface of the engine compartment 18 is opened. Note that in the engine compartment cover 16a shown in FIGS. 4 and 5, a cover located directly above the engine 21 and a cover located directly above the aftertreatment device 23 are separate pieces, but these are not integrated. You can.

Pump chamber cover 16b defines the upper surface of pump chamber 19. That is, the pump chamber cover 16b is disposed adjacent to the right side of the engine chamber cover 16a located directly above the aftertreatment device 23. Although the pump chamber cover 16b according to the present embodiment is configured to be unable to be opened and closed, it may be openable and closable like the engine chamber cover 16a.

Further, the engine compartment cover 16a includes a top wall 26 and a peripheral wall 27. The ceiling wall 26 is a portion that defines the upper surface of the engine compartment 18. The peripheral wall 27 is a portion that protrudes from the outer periphery of the ceiling wall 26 in a direction perpendicular to the ceiling wall 26 and continues along the outer periphery of the ceiling wall 26. When the pump chamber cover 16b is in the closed position, the top wall 26 is located above the pump chamber cover 16b, and the peripheral wall 27 projects downward from the outer periphery of the top wall 26. That is, the right side portion of the peripheral wall 27 (the portion adjacent to the pump chamber cover 16b) is located above the pump chamber cover 16b. In other words, the right side portion of the peripheral wall 27 is exposed to the outside of the hydraulic excavator 1.

Further, an exhaust port 28 is formed in the peripheral wall 27 and penetrates in the thickness direction. The exhaust port 28 is an opening that exhausts cooling air generated by the cooling fan 22 from the engine compartment 18. The exhaust port 28 is formed in the right side portion (the portion adjacent to the pump chamber cover 16b) of the peripheral wall 27 formed so as to surround the ceiling wall 26. That is, the exhaust port 28 is formed on the right side surface of the engine chamber cover 16a above the pump chamber cover 16b. Note that, although the exhaust port 28 according to the present embodiment includes two exhaust ports 28a and 28b adjacent to each other in the front-rear direction, the number of the exhaust ports 28 is not limited to this.

FIG. 6 is a diagram showing the positional relationship between the electronic component 25 and the exhaust ports 28a and 28b in the front-back direction and the left-right direction. FIG. 7 is a diagram showing the vertical and horizontal positional relationships between the electronic component 25 and the exhaust ports 28a and 28b.

First, as shown in FIG. 6, at least a portion of the exhaust ports 28a and 28b are located behind the electronic component 25. More specifically, the rear end B1 of the exhaust port 28a is located further back than the rear end B2 of the electronic component 25. Further, the front end F1 of the exhaust port 28b is located at the rear of the front end F2 of the electronic component 25.

Further, as shown in FIG. 7, at least a portion of the exhaust ports 28a and 28b are located below the upper end of the electronic component 25. More specifically, the lower ends L1 of the exhaust ports 28a and 28b are located below the upper end U2 of the electronic component 25 and above the lower end L2 of the electronic component 25. Further, the upper end U1 of the exhaust ports 28a and 28b is located above the upper end U2 of the electronic component 25.

Furthermore, as shown in FIGS. 6 and 7, the exhaust ports 28a and 28b are located to the right of the electronic component 25. That is, a gap is formed in the left-right direction between the electronic component 25 and the exhaust ports 28a and 28b.

Next, the flow of cooling air within the engine compartment 18 will be described in detail with reference to FIGS. 2, 3, 6, and 7. In FIGS. 2, 3, 6, and 7, the main flow of cooling air is indicated by broken arrows.

Note that the members 11 to 17 that define the engine chamber 18 have openings and gaps other than the exhaust ports 28a and 28b. However, the exhaust ports 28a and 28b have a larger opening area than other openings and gaps. Therefore, most of the cooling air that has entered the engine compartment 18 through the intake port 14a is exhausted from the exhaust ports 28a and 28b. The main flow paths of cooling air from the cooling fan 22 to the exhaust ports 28a and 28b are as follows.

First, the cooling air generated by the cooling fan 22 hits the left side of the engine 21. The cooling air that hits the left side of the engine 21 is divided into the front and rear of the engine 21 and passes through the space between the front wall 11 and the engine 21 and the space between the rear wall 12 and the engine 21. , flows to the right (that is, toward the partition wall 17).

Here, when the interior of the engine compartment 18 is viewed from the left side as shown in FIG. 3, the rear end P1 of the cooling fan 22 is located forward of the rear end P2 of the engine 21. Further, the upper end of the cooling fan 22 is located below the upper end of the engine 21. Further, the longitudinal gap between the front wall 11 and the engine 21 (more specifically, the area of the space through which cooling air can pass) is wider than the longitudinal gap between the rear wall 12 and the engine 21.

As a result, most of the cooling air that hits the left side of the engine 21 goes around to the front of the engine 21 and flows rightward along the front wall 11. Further, the cooling air flowing along the front wall 11 hits the partition wall 17 and changes its direction rearward. Furthermore, as the cooling air is warmed by the heat of the engine 21, an upward air current is generated. The cooling air flowing rearward along the partition wall 17 is exhausted from the engine compartment 18 through the exhaust ports 28a and 28b.

According to the above embodiment, for example, the following effects are achieved.

According to the embodiment described above, by arranging the exhaust ports 28a and 28b behind the electronic components 25, the cooling air flowing backward along the partition wall 17 is delivered to the electronic components before being exhausted from the exhaust ports 28a and 28b. Pass around 25. Further, by arranging at least a portion of the exhaust ports 28a, 28b below the upper end of the electronic component 25, the cooling air rising in the engine compartment 18 passes above the electronic component 25, and the exhaust ports 28a, 28b can be prevented from being exhausted. As a result, the electronic component 25 attached to the upper part of the post-processing device 23 can be appropriately cooled.

Further, according to the above embodiment, by arranging the front wall 11, the rear wall 12, the engine 21, and the cooling fan 22 as shown in FIG. Wind flow increases. Since this cooling air cools the electronic component 25 before being exhausted from the exhaust ports 28a and 28b, the electronic component 25 can be further appropriately cooled.

Further, according to the embodiment described above, by providing the exhaust ports 28a and 28b on the side surface (that is, the peripheral wall 27) of the engine compartment cover 16a, it is possible to prevent rainwater and the like from entering the engine compartment 18. Thereby, the electronic component 25 can be prevented from being exposed to water. Note that a louver to prevent rainwater from entering, a net to prevent dust from entering, or the like may be attached to the exhaust ports 28a and 28b.

In addition, in the embodiment mentioned above, the hydraulic excavator 1 provided with the crawler type lower traveling body 2 was mentioned as an example and demonstrated as a working machine. However, the present invention is not limited to this, and may be applied to, for example, a hydraulic excavator equipped with a wheel-type lower traveling body. In addition, it can be widely applied to other working machines such as wheel loaders, dump trucks, and hydraulic cranes.

The embodiments described above are illustrative examples of the present invention, and are not intended to limit the scope of the present invention only to those embodiments. Those skilled in the art can implement the present invention in various other ways without departing from the spirit of the invention.

1 Hydraulic excavator (work machine)
2 Lower traveling body 3 Upper rotating body 4 Front work equipment 4a Boom 4b Arm 4c Bucket 4d, 4e, 4f Hydraulic cylinder 5 Swivel frame 6 Counterweight 7 Cab 10 Engine building 11 Front wall 12 Rear wall 13 Bottom wall 14 Left side wall 14a Intake Port 15 Right side wall 16 Top cover 16a Engine chamber cover 16b Pump chamber cover 17 Partition wall 18 Engine chamber (internal space)
19 Pump room (internal space)
21 Engine 22 Cooling fan 23 After-treatment device 24 Hydraulic pump 25 Electronic components 26 Top wall 27 Peripheral wall 28, 28a, 28b Exhaust port

Claims (5)

A building having an internal space;
an engine housed in the internal space;
a cooling fan that is housed in the internal space on one side in the width direction of the building from the engine and generates cooling air toward the other side in the width direction;
an after-treatment device that is housed in the internal space on the other side of the engine in the width direction and processes exhaust gas from the engine;
A working machine comprising an electronic component attached to an upper part of the post-processing device,
The said building is
a front wall defining a front surface of the interior space;
a rear wall defining a rear surface of the interior space;
a side wall disposed on the other side in the width direction from the post-processing device;
an upper surface cover that defines the upper surface of the interior space and is formed with an exhaust port that exhausts cooling air flowing along the front wall and the side wall from the interior space;
The working machine is characterized in that the exhaust port is located behind the electronic component and at least partially below the upper end of the electronic component. The working machine according to claim 1,
comprising a hydraulic pump operated by the driving force of the engine,
The side wall divides the internal space into an engine chamber that accommodates the engine, the cooling fan, and the aftertreatment device, and a pump chamber that accommodates the hydraulic pump on the other side of the engine chamber in the width direction. It is a partition wall,
The top cover is
an engine compartment cover defining an upper surface of the engine compartment directly above the aftertreatment device;
a pump chamber cover defining an upper surface of the pump chamber;
The working machine is characterized in that the exhaust port is formed on a side surface of the engine compartment cover above the pump compartment cover. The working machine according to claim 2,
A working machine characterized in that a longitudinal gap between the front wall and the engine is wider than a longitudinal gap between the rear wall and the engine. The working machine according to claim 3,
A working machine characterized in that a rear end of the cooling fan is located forward of a rear end of the engine. The working machine according to claim 3,
A working machine characterized in that an upper end of the cooling fan is located below an upper end of the engine.

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