Working machinery

Abstract

To provide a work machine improving a workability during maintenance of an exhaust gas post-treatment device.SOLUTION: A hydraulic shovel 1 comprises: an engine 30 arranged on an upper face of a revolving frame 121; an exhaust gas post-treatment device 33 having a first side face 33A and a second side face 33B on the side opposite thereto in a horizontal direction, and purifying exhaust gas of the engine 30; and a support portion 50 arranged on the upper face and supporting only the first side face 33A out of the first side face 33A and the second side face 33B of the exhaust gas post-treatment device 33 so that the exhaust gas post-treatment device 33 is adjacent to the engine 30.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a working machine including an exhaust gas post-treatment device that purifies exhaust gas from an engine. [Background Art]

[0002] Conventionally, exhaust gas post-treatment devices that remove pollutants from engine exhaust gas have been known.

[0003] For example, the exhaust gas post-treatment device described in Patent Document 1 removes unburned gas in exhaust gas through oxidation, and also removes nitrogen oxides through a selective catalytic reduction reaction.

[0004] Further, in the technology described in Patent Document 1, both left and right side portions of the exhaust gas post-treatment device are respectively supported by a pair of mounting plates, and the pair of mounting plates are fixed to the engine via a support mechanism and a holding mechanism. [Prior Art Documents] [Patent Documents]

[0005] [Patent Document 1] Japanese Patent No. 6451240 [Summary of the Invention] [Problem to be Solved by the Invention]

[0006] In the technology described in Patent Document 1, since both the left and right sides of the exhaust gas post-treatment device are covered by a pair of mounting plates, there is a problem that workability during maintenance of the exhaust gas post-treatment device is poor. [Means for Solving the Problem]

[0007] An object of the present invention is to provide a working machine with improved workability during maintenance of an exhaust gas post-treatment device.

[0008] The present invention provides a work machine. The work machine comprises a slewing frame supported by a lower traveling body and having an upper surface; an engine positioned on the upper surface; an exhaust gas aftertreatment device having a first side surface and a second side surface opposite to the first side surface in the horizontal direction, for purifying the exhaust gas of the engine; and a support portion positioned on the upper surface, which supports only the first side of the exhaust gas aftertreatment device, of the first and second sides, such that the exhaust gas aftertreatment device is adjacent to the engine.

[0009] In this configuration, the support portion for the exhaust gas aftertreatment device supports only the first side of the exhaust gas aftertreatment device, out of the first and second sides. Therefore, compared to the case where both sides of the exhaust gas aftertreatment device are supported, access to the exhaust gas aftertreatment device from outside the work machine is made easier, and the effort required to remove the exhaust gas aftertreatment device is reduced. As a result, maintenance work on the exhaust gas aftertreatment device can be performed more easily.

[0010] In the above configuration, the support portion may include a vertical plate positioned opposite the first side surface, and the exhaust gas aftertreatment device may be fixed to the vertical plate by a fixing member.

[0011] With this configuration, since the exhaust gas aftertreatment device is fixed to the vertical plate facing the first side surface by a fixing member, the support can stably support the exhaust gas aftertreatment device.

[0012] In the above configuration, the support portion may include a support body including the vertical plate, and a frame positioned on the upper surface of the slewing frame further outward in the left-right direction than the engine, and supporting the support body, wherein the frame may include a top plate that supports the support body, and a plurality of legs extending downward from the top plate and fixed to the upper surface of the slewing frame.

[0013] According to this configuration, the support section includes a support body that supports the exhaust gas aftertreatment device and a frame that supports the support body on the slewing frame, thus enabling stable support of the exhaust gas aftertreatment device. Furthermore, since the frame is positioned outside the engine in the left-right direction, the exhaust gas aftertreatment device can be easily accessed from outside the work machine. In addition, since the top plate of the frame supports the support body, and multiple legs further support the top plate, the exhaust gas aftertreatment device can be stably supported on the slewing frame. Furthermore, by utilizing the height of the multiple legs, the exhaust gas aftertreatment device is held at a predetermined height above the top surface of the slewing frame, making maintenance of the exhaust gas aftertreatment device even easier.

[0014] In the above configuration, the support further comprises a lower plate that is positioned to overlap the top plate and fixed to the top plate, the plurality of legs include a first leg and a second leg, and the frame may further comprises a reinforcing member that connects the first leg and the second leg to each other below the top plate and is positioned to intersect with the lower plate in a plan view.

[0015] In this configuration, the support structure has a lower plate that overlaps the top plate, allowing the support structure that supports the exhaust gas aftertreatment device to be stably supported by the top plate of the frame. Furthermore, since the reinforcing members that connect the first and second legs are positioned below the lower plate, vibrations of the exhaust gas aftertreatment device can be suppressed by the support structure and the frame. As a result, the durability of the support structure, including the support structure and the frame, can also be improved.

[0016] In the above configuration, the reinforcing member may be arranged parallel to the vertical plate in a plan view.

[0017] With this configuration, since the reinforcing member extends along the vertical plate below it, the exhaust gas aftertreatment device can be stably supported between the first leg and the second leg, and its vibrations can be suppressed.

[0018] In the above configuration, the system may further include a heat exchanger, which includes a rotating fan, positioned on the upper surface of the swing frame adjacent to the engine, and the vertical plate may have vertical plate vents formed therein that penetrate the vertical plate along the horizontal direction.

[0019] With this configuration, the airflow generated by the heat exchanger's fan can pass through the vertical plate vents, thus stabilizing the airflow and improving the cooling performance of the heat exchanger.

[0020] In the above configuration, the exhaust gas aftertreatment device includes a first processing unit for removing a first component from the exhaust gas, and a second processing unit which is spaced apart from the first processing unit in the vertical direction and removes a second component from the exhaust gas, and the vertical plate vent may be formed so as to overlap the space between the first processing unit and the second processing unit when viewed along the direction in which the vertical plate vent penetrates the vertical plate.

[0021] With this configuration, the airflow generated by the heat exchanger fan can reach the vertical plate vents through the space between the first and second processing units, thus stabilizing the airflow and further improving the cooling performance of the heat exchanger.

[0022] In the above configuration, the exterior panel further comprises an exterior panel covering the engine and the exhaust gas aftertreatment device, and the exterior panel may have panel vents formed therein that are arranged to overlap the vertical plate vents when viewed along the direction in which the vertical plate vents penetrate the vertical plate.

[0023] With this configuration, the airflow generated by the heat exchanger's fan can flow to the outside through the vertical plate vents and panel vents, thus preventing obstruction of the airflow and further improving the cooling performance of the heat exchanger. Depending on the fan arrangement, airflow in the opposite direction is also possible.

[0024] In the above configuration, the working machine may further include a counterweight supported by the swing frame, and the counterweight may be formed with a weight vent that is disposed so as to overlap the vertical plate vent when viewed along a direction in which the vertical plate vent penetrates the vertical plate.

[0025] According to this configuration, since the airflow generated by the fan of the heat exchanger flows to the outside from the vertical plate vent through the weight vent, the flow of the airflow is less likely to be blocked, and the cooling performance of the heat exchanger can be further improved. Depending on the arrangement of the fan, an airflow flowing in the opposite direction to the above is also possible.

[0026] In the above configuration, the working machine may further include an exterior panel that covers the engine and the exhaust gas aftertreatment device, the exterior panel has an opening / closing part whose state can be changed between an open state and a closed state, the open state is a state where the opening / closing part opens the vertical plate of the support part to the outside, and the closed state is a state where the opening / closing part covers the vertical plate.

[0027] According to this configuration, by opening the opening / closing part of the exterior panel, it is possible to easily access the fixing member that fixes the vertical plate and the exhaust gas aftertreatment device from the outside. Effects of the Invention

[0028] According to the present invention, there is provided a working machine with improved workability during maintenance of an exhaust gas aftertreatment device. Brief Description of the Drawings

[0029] [Figure 1] It is a side view of a working machine according to an embodiment of the present invention. [Figure 2] It is a schematic plan view of a working machine according to an embodiment of the present invention. [Figure 3] It is a schematic rear view for explaining the positional relationship among a heat exchanger, an engine, and an exhaust gas aftertreatment device in a working machine according to an embodiment of the present invention. [Figure 4]This is a perspective view showing the exhaust gas aftertreatment device of a work machine according to one embodiment of the present invention, supported by a support part. [Figure 5] This is a perspective view showing the exhaust gas aftertreatment device of a work machine according to one embodiment of the present invention, supported by a support part. [Figure 6] This is a perspective view of the support body of a work machine according to one embodiment of the present invention. [Figure 7] This is a perspective view of the frame of the support part of a work machine according to one embodiment of the present invention. [Figure 8] This is a plan view of the support part of a work machine according to one embodiment of the present invention. [Figure 9] This is a perspective view of a work machine according to one embodiment of the present invention. [Figure 10] This is an enlarged side view of a part of a work machine according to one embodiment of the present invention. [Modes for carrying out the invention]

[0030] Preferred embodiments of the present invention will be described below with reference to the drawings.

[0031] Figure 1 shows a side view of a hydraulic excavator 1 (working machine) according to one embodiment of the present invention. Figure 2 is a schematic plan view of the hydraulic excavator 1.

[0032] The hydraulic excavator 1 comprises a lower traveling body 10 (lower body) capable of traveling on the ground G (travel surface), an upper rotating body 12 (upper body) rotatably supported by the lower traveling body 10, and a work attachment 20 mounted on the upper rotating body 12. The lower traveling body 10 and the upper rotating body 12 constitute the machine body of the hydraulic excavator 1.

[0033] The lower traveling body 10 is capable of traveling on the ground G. The lower traveling body 10 includes a crawler-type traveling section (a pair of crawlers 10A in Figure 2).

[0034] The upper slewing body 12 includes a slewing frame 121 supported by the lower traveling body 10, a cab 13 mounted on the slewing frame 121, and a counterweight 15. The cab 13 allows an operator to board and houses various devices for operating the hydraulic excavator 1. The counterweight 15 is located on the rear portion of the slewing frame 121 and functions as a weight to balance the hydraulic excavator 1.

[0035] The work attachment 20 is mounted on the upper slewing body 12 so as to be movable relative to the upper slewing body 12 and performs predetermined work on the ground. The work attachment 20 includes a boom 21 connected to the front end of the slewing frame 121 so as to be rotatable in the luffing direction around a horizontal rotation axis, an arm 22 connected to the tip of the boom 21 so as to be rotatable around a horizontal rotation axis, and a bucket 23 connected to the tip of the arm 22 so as to be rotatable around a horizontal rotation axis. In this embodiment, the rotation axes of the boom 21, arm 22, and bucket 23 are set parallel to each other. The boom 21 and arm 22 constitute the luffing body of the hydraulic excavator 1. Figure 2 shows an attachment support part 20S that supports the base end of the attachment support part 20S (boom 21) on the right side of the cab 13. Furthermore, the work attachment 20 includes a boom cylinder 21S that extends and retracts to raise (rotate) the boom 21, an arm cylinder 22S that extends and retracts to rotate the arm 22, and a bucket cylinder 23S that extends and retracts to rotate the bucket 23. Each of these cylinders is composed of a hydraulic cylinder.

[0036] The cab 13 is mounted at the front of the slewing frame 121, adjacent to the work attachment 20 in the width direction (left-right direction) of the slewing frame 121 (to the left of the work attachment 20 in the example shown in Figures 1 and 2), and constitutes the operator's cabin for operating the hydraulic excavator 1. That is, from inside the cab 13, the operator performs operations for the movement of the lower travel body 10, the rotation of the upper slewing body 12, and the operation of the work attachment 20.

[0037] Figure 3 is a schematic rear view illustrating the positional relationship between the radiator 31, engine 30, and exhaust gas aftertreatment device 33 in the hydraulic excavator 1 according to this embodiment.

[0038] Referring to Figures 2 and 3, the upper slewing body 3 is equipped with an engine 30, a radiator 31 (heat exchanger) including a cooling fan 32, an exhaust gas aftertreatment device 33, and a support section 50, all mounted on the slewing frame 121. Note that in each figure, the view is shown from the perspective of an operator seated in the driver's seat of the cab 13 located on the upper slewing body 3.

[0039] The engine 30 has an output shaft, and is mounted on the upper surface of the slewing frame 121 with the output shaft positioned along the left-right direction.

[0040] As shown in Figure 3, the cooling fan 32 is connected to the left end of the output shaft of the engine 30 and rotates in conjunction with the rotation of the output shaft.

[0041] The radiator 31 is located adjacent to the left side of the engine 30 and cools the coolant and lubricating oil. The radiator 31 is cooled by outside air introduced by the cooling fan 32. After cooling the radiator 31, the airflow generated by the cooling fan 32 flows inside the upper rotating body 12 in the direction of arrow DS in Figure 2 and is then exhausted to the outside. An air intake port (not shown) is located to the left of the radiator 31 in the upper rotating body 12.

[0042] The exhaust gas aftertreatment device 33 purifies the exhaust gas from the engine 30. The exhaust gas aftertreatment device 33 is supported by a support unit 50 so as to be positioned adjacent to the right side of the engine 30. The specific structure of the exhaust gas aftertreatment device 33 and the support unit 50 will be described further below.

[0043] Figures 4 and 5 are perspective views showing the exhaust gas aftertreatment device 33 of the hydraulic excavator 1 according to this embodiment, supported by the support portion 50.

[0044] The exhaust gas aftertreatment device 33 includes a first processing unit 331 that removes a first component from the exhaust gas and a second processing unit 332 that removes a second component from the exhaust gas.

[0045] The first processing unit 331 removes unburned gases (examples of first components: hydrocarbons, carbon monoxide, nitrogen oxides, etc.) in the exhaust gas by oxidation. The first processing unit 331 in this embodiment has an oxidation catalyst (Diesel Oxidation Catalyst: hereinafter referred to as DOC) that has the function of oxidizing and removing unburned gases in the exhaust gas. The first processing unit 331 may have a filter (Diesel Particulate Filter) to capture particulate matter (example of first components: Particulate Matter: hereinafter referred to as PM) in the exhaust gas, either in place of the DOC or in addition to the DOC.

[0046] The second processing unit 332 removes nitrogen oxides (an example of a second component: hereinafter referred to as NOx) from the exhaust gas by a selective catalytic reduction (SCR) reaction. The second processing unit 332 is positioned at a distance from the first processing unit 331 in the vertical direction. For example, the first processing unit 331 and the second processing unit 332 have a cylindrical shape that extends long in the front-to-back direction. Note that in Figures 4 and 5, some components of the exhaust gas aftertreatment device 33 that connect and hold the first processing unit 331 and the second processing unit 332 are not shown.

[0047] The exhaust gas discharged from the engine 30 is introduced into the first processing unit 331 through an inlet pipe (not shown), flows from front to back within the first processing unit 331, and is then introduced into the second processing unit 332. Subsequently, the exhaust gas flows from front to back within the second processing unit 332 and is discharged onto the upper part of the upper rotating body 12.

[0048] As shown in Figures 3 to 5, the right side of the exhaust gas aftertreatment device 33 is defined as the first side surface 33A, and the left side of the exhaust gas aftertreatment device 33, opposite the first side surface 33A, is defined as the second side surface 33B. The shape of these sides is not particularly limited and includes flat surfaces, curved surfaces, etc. The side surface refers to the area visible when the exhaust gas aftertreatment device 33 is viewed from the horizontal. The first side surface 33A refers to the area visible when the exhaust gas aftertreatment device 33 is viewed from the right side, and the second side surface 33B refers to the area visible when the exhaust gas aftertreatment device 33 is viewed from the left side. In other words, the side surface refers to the area projected horizontally from the exhaust gas aftertreatment device 33.

[0049] Figure 6 is a perspective view of the support body 51 of the support section 50 of the hydraulic excavator 1 according to this embodiment. Figure 7 is a perspective view of the frame 52 of the support section 50 of the hydraulic excavator 1. Figure 8 is a plan view of the support section 50 of the hydraulic excavator 1.

[0050] The support portion 50 is positioned on the upper surface of the swing frame 121 and supports the exhaust gas aftertreatment device 33 so that it is adjacent to the engine 30. In particular, the support portion 50 supports only the first side surface 33A of the exhaust gas aftertreatment device 33, out of the two side surfaces 33B. The support portion 50 also supports the exhaust gas aftertreatment device 33 so that the second side surface 33B of the exhaust gas aftertreatment device 33 is positioned facing the engine 30.

[0051] Specifically, the support section 50 includes a support body 51 and a frame 52.

[0052] The support body 51 is the part of the support section 50 that directly supports the exhaust gas aftertreatment device 33. The support body 51 has a support plate 511 (vertical plate), a rear side plate 512, a front side plate 513, and a bottom plate 514 (lower plate).

[0053] The support plate 511 is positioned opposite the first side surface 33A of the exhaust gas aftertreatment device 33. The support plate 511 is a rectangular plate-like portion that extends in the vertical and front-rear directions and has a predetermined thickness in the left-right direction. The support plate 511 has the function of supporting the exhaust gas aftertreatment device 33. Specifically, the exhaust gas aftertreatment device 33 is fixed to the support plate 511 by a plurality of bolts (fixing members) not shown. More specifically, the support plate 511 has a plurality of holes 51S for the aftertreatment device formed therein. In this embodiment, as shown in Figure 6, four holes 51S for the aftertreatment device are opened at the upper end and lower end of the support plate 511, respectively, at intervals along the front-rear direction. Each aftertreatment device hole 51S penetrates the support plate 511 along the left-right direction. After bolts (not shown) are inserted through each aftertreatment device hole 51S, their tips are fastened to bolt holes (not shown) formed in the first side surface 33A of the exhaust gas aftertreatment device 33, thereby fixing and supporting the exhaust gas aftertreatment device 33 to the support plate 511. The first side surface 33A may be directly supported by the support plate 511 of the support body 51, or it may be supported via fixing members (brackets) (not shown) for fixing the first side surface 33A to the support plate 511.

[0054] Furthermore, four ventilation openings 51H (vertical plate ventilation openings) are formed in the area between the upper and lower post-treatment device holes 51S of the support plate 511. Each ventilation opening 51H penetrates the support plate 511 horizontally and has a triangular shape with the center of the support plate 51 as its apex when viewed from the left or right direction. In other words, a rectangular ventilation hole is formed in the center of the support plate 511, leaving an area that diagonally connects a pair of diagonal corners of the support plate 511.

[0055] Referring to Figure 4, when viewed along the left-right direction (the direction in which the vent 51H penetrates the support plate 511), the vent 51H is formed to overlap with the space between the first processing unit 331 and the second processing unit 332. That is, around the exhaust gas aftertreatment device 33, airflow can flow from the space between the first processing unit 331 and the second processing unit 332 to the right through the vent 51H and out to the outside (right side) of the support plate 511. Airflow can also flow in the opposite direction.

[0056] The rear side plate 512 (Figure 6) is connected to the rear side of the support plate 511 and is positioned to extend to the left from the support plate 511. Similarly, the front side plate 513 is connected to the front side of the support plate 511 and is positioned to extend to the left from the support plate 511. Both the rear side plate 512 and the front side plate 513 have a roughly L-shape when viewed from the front.

[0057] The base plate 514 connects the lower ends of the support plate 511, the rear side plate 512, and the front side plate 513. The base plate 514 is a horizontally extending plate-like portion. As shown in Figure 6, the right end of the base plate 514 has a shape that protrudes slightly outward in the front-rear direction from the rear side plate 512 and the front side plate 513. Connecting holes 51P are formed in these front and rear protrusions. On the other hand, as shown in Figure 8, the base plate 514 has a U-shape that opens to the left in a plan view, and connecting holes 51P are also formed in each of its two front ends. Bolts (not shown) for connecting the support body 51 and the frame 52 are inserted through these four connecting holes 51P.

[0058] The frame 52 is positioned on the upper surface of the slewing frame 121, further outward from the engine 30 in the lateral direction, and supports the support 51. Referring to Figure 7, the frame 52 has a first leg portion 521, a second leg portion 522, a third leg portion 523, a top plate 524, and a reinforcing portion 525 (reinforcing member). The top plate 524 is a member that supports the support 51 and, as shown in Figure 8, has a size that encompasses the bottom plate 514 in a plan view. In other words, the bottom plate 514 of the aforementioned support 51 is positioned to overlap the top plate 524 and is fixed to the top plate 524 by a plurality of bolts.

[0059] The first leg portion 521, the second leg portion 522, and the third leg portion 523 (multiple legs) extend downward from the top plate 524 and are fixed to the upper surface of the swivel frame 121. As shown in Figure 7, multiple fixing holes 52Q are opened at the lower end of each leg portion, and the frame 52 is fixed to the swivel frame 121 by inserting bolts (not shown) through these fixing holes 52Q. As shown in Figure 8, the first leg portion 521 and the second leg portion 522 are positioned at both ends of the long side of the top plate 524, respectively, and the third leg portion 523 is positioned so as to face the opening of the U-shaped bottom plate 514 in a plan view.

[0060] The reinforcing portion 525 connects the first leg portion 521 and the second leg portion 522 to each other below the top plate 524. The reinforcing portion 525 may be integrally formed with at least one of the legs, the first leg portion 521 and the second leg portion 522. As shown in Figure 8, the reinforcing portion 525 is positioned so as to intersect with the bottom plate 514 of the support 51 in a plan view. In this embodiment, the reinforcing portion 525 is a rib extending in the front-rear direction. The upper end of the reinforcing portion 525 is connected to the lower surface of the top plate 524. Furthermore, as shown in Figure 8, the reinforcing portion 525 is positioned parallel to the support plate 511 of the support 51 in a plan view. Note that this parallelism includes not only perfect parallelism but also a state of approximate parallelism. For example, it may include a state in which one of the reinforcing portion 525 and the support plate 511 is tilted by a maximum of 5 degrees or a maximum of 10 degrees relative to the other. Furthermore, in a plan view, the reinforcing portion 525 is positioned between two connecting holes 51P (also called fixing portions) on the outside (right side) and two connecting holes 51P on the inside (left side). Therefore, compared to the case where multiple connecting holes 51P are arranged only on the outside or only on the inside of the reinforcing portion 525, vibration of the exhaust gas aftertreatment device 33 can be suppressed.

[0061] Figure 9 is a perspective view of the hydraulic excavator 1. Figure 10 is an enlarged side view of a part of the hydraulic excavator 1. In Figure 10, the ventilation opening 51H of the support plate 511 located inside the upper rotating body 12 is schematically depicted as a dashed rectangle.

[0062] The hydraulic excavator 1 further comprises an exterior panel 16. The exterior panel 16 is positioned to cover the side and rear portions of the upper rotating body 12. In other words, the exterior panel 16 covers the aforementioned engine 30, radiator 31, exhaust gas aftertreatment device 33, etc. In this embodiment, the exterior panel 16 has a substantially U-shape in plan view. Also, as shown in Figure 9, the aforementioned counterweight 15 is supported on the slewing frame 121 together with the exterior panel 16 to form the exterior of the upper rotating body 12.

[0063] As shown in Figures 9 and 10, the exterior panel 16 has a plurality of exterior panel vents 16H (panel vents). The exterior panel vents 16H are openings that penetrate the exterior panel 16 and are arranged to overlap with the vents 51H of the support plate 511 when viewed along the left-right direction. In this embodiment, the exterior panel vents 16H are in communication with the upper portion of the vents 51H along the left-right direction.

[0064] Furthermore, the counterweight 15 has a counterweight vent 15H (weight vent). When viewed along the left-right direction, the counterweight vent 15H is positioned to overlap with the vent 51H of the support plate 511. In this embodiment, the counterweight vent 15H is in communication with the lower part of the vent 51H along the left-right direction.

[0065] Furthermore, the exterior panel 16 has an openable / closable door 17 (opening / closing section). Specifically, the openable / closable door 17 can be switched between an open state and a closed state. The open state is when the openable / closable door 17 opens the support plate 511 of the support section 50 to the outside, and the closed state is when the openable / closable door 17 covers the support plate 511 from the right side.

[0066] In the hydraulic excavator 1 described above, as shown in Figures 3 to 5, the support portion 50 that supports the exhaust gas aftertreatment device 33 supports only the first side surface 33A of the exhaust gas aftertreatment device 33, out of the first side surface 33A and second side surface 33B of the exhaust gas aftertreatment device 33. Therefore, compared to the case where both sides of the exhaust gas aftertreatment device 33 are supported, access to the exhaust gas aftertreatment device 33 from the outside of the hydraulic excavator 1 is made easier, and the effort required for removing the exhaust gas aftertreatment device 33 is reduced. As a result, maintenance work on the exhaust gas aftertreatment device 33 can be easily performed.

[0067] In particular, in this embodiment, since the exhaust gas aftertreatment device 33 is fixed to the support plate 511 facing the first side surface 33A by a plurality of bolts, the support portion 50 can stably support the exhaust gas aftertreatment device 33.

[0068] Furthermore, since the support section 50 includes a support body 51 that supports the exhaust gas aftertreatment device 33 and a frame 52 that supports the support body 51 on the slewing frame 121, the exhaust gas aftertreatment device 33 can be stably supported. Moreover, since the frame 52 is positioned outside the slewing frame 121 in the left-right direction compared to the engine 30, the engine 30 does not get in the way, and the operator can easily access the exhaust gas aftertreatment device 33 from the outside of the hydraulic excavator 1.

[0069] Furthermore, since the top plate 524 of the frame 52 supports the support body 51, and the multiple legs 521, 522, and 523 further support the top plate 524, the exhaust gas aftertreatment device 33 can be stably supported on the slewing frame 121. Also, by utilizing the height of the multiple legs, the exhaust gas aftertreatment device 33 is held at a predetermined height above the upper surface of the slewing frame 121, making maintenance of the exhaust gas aftertreatment device 33 even easier. In this embodiment, the support body 51 can be removed from the frame 52 by loosening the multiple bolts connecting the support body 51 and the frame 52. At this time, it is also possible to remove the support body 51 and the exhaust gas aftertreatment device 33 together from the upper slewing body 12 of the hydraulic excavator 1, while the exhaust gas aftertreatment device 33 remains fixed to the support plate 511.

[0070] Furthermore, in this embodiment, since the support 51 has a bottom plate 514 that is positioned to overlap the top plate 524, the support 51 that supports the exhaust gas aftertreatment device 33 can be more stably supported by the top plate 524 of the frame 52. Also, since the reinforcing part 525 that connects the first leg portion 521 and the second leg portion 522 is positioned below the bottom plate 514, vibrations of the exhaust gas aftertreatment device 33 can be suppressed by the support 51 and the frame 52. As a result, the durability of the support portion 50, including the support 51 and the frame 52, can also be improved. In addition, since the upper end of the reinforcing part 525 that connects the first leg portion 521 and the second leg portion 522 is also connected to the top plate 524, vibrations of the exhaust gas aftertreatment device 33 can be more stably suppressed by the support 51 and the frame 52.

[0071] Furthermore, in this embodiment, as shown in Figure 8, the reinforcing portion 525 is arranged parallel to the support plate 511 in a plan view. With this configuration, since the reinforcing portion 525 extends along the support plate 511 below it, the exhaust gas aftertreatment device 33 can be stably supported between the first leg portion 521 and the second leg portion 522, and its vibration can be further suppressed.

[0072] Furthermore, the support plate 511 has a vent 51H that penetrates the support plate 511 horizontally. As a result, the airflow generated by the cooling fan 32 of the radiator 31 can pass through the vent 51H, stabilizing the airflow and improving the cooling performance of the radiator 31.

[0073] Furthermore, in this embodiment, when viewed along the left-right direction, the vent 51H is formed to overlap with the space between the first processing unit 331 and the second processing unit 332. Therefore, the airflow generated by the cooling fan 32 of the radiator 31 can reach the vent 51H through the space between the first processing unit 331 and the second processing unit 332, thus stabilizing the airflow and further improving the cooling performance of the radiator 31. Depending on the arrangement of the cooling fan 32, an airflow in the opposite direction to the above is also possible.

[0074] Furthermore, as shown in Figure 10, when viewed along the left-right direction, the exterior panel vent 16H is positioned to overlap with the vent 51H. Therefore, the airflow generated by the cooling fan 32 of the radiator 31 flows from the vent 51H through the exterior panel vent 16H to the outside, thus preventing obstruction of the airflow and further improving the cooling performance of the radiator 31. Depending on the arrangement of the cooling fan 32, the opposite airflow is also possible.

[0075] Similarly, when viewed along the left-right direction, the counterweight vent 15H is positioned to overlap with the vent 51H. As a result, the airflow generated by the cooling fan 32 of the radiator 31 flows from the vent 51H through the counterweight vent 15H to the outside, thus preventing obstruction of the airflow and further improving the cooling performance of the radiator 31. Depending on the arrangement of the cooling fan 32, the opposite airflow is also possible.

[0076] Furthermore, regarding the arrangement of the support plate 511, in this embodiment, the support plate 511 of the support body 51 is positioned on the opposite side of the engine 30 from the exhaust gas aftertreatment device 33. As a result, the airflow generated by the cooling fan 32 of the radiator 31 passes through the engine 30 and the exhaust gas aftertreatment device 33 before being discharged from the vent 51H. This improves the cooling performance of each device. Moreover, external access to bolts (not shown) that fix the support plate 511 to the exhaust gas aftertreatment device 33 is prevented from being obstructed by the engine 30.

[0077] In this case, the operator can also easily access the bolts from the outside by opening the door 17 of the exterior panel 16.

[0078] Although the hydraulic excavator 1 has been described above as a working machine according to the present invention, the present invention is not limited to the above embodiments. Further examples of the present invention include the following modified embodiments.

[0079] In a first modified embodiment of the present invention, the first side surface 33A of the exhaust gas aftertreatment device 33 may be any of the front, left, or rear side surfaces of the exhaust gas aftertreatment device 33. In this case, the support plate 511 of the support body 51 should be positioned opposite the said side surface and fixed to the said side surface.

[0080] The support portion 50 is not limited to being composed of a support body 51 and a frame 52. In a second modified embodiment of the present invention, the support portion 50 may be an integrated structure.

[0081] The exhaust gas aftertreatment device 33 is not limited to being located on the right side of the engine 30. In a third modified embodiment of the present invention, the exhaust gas aftertreatment device 33 may be located on the front, left, or rear side of the engine 30.

[0082] The exhaust gas aftertreatment device 33 is not limited to being composed of a first processing unit 331 and a second processing unit 332. In a fourth modified embodiment of the present invention, the exhaust gas aftertreatment device 33 may have one processing unit or three or more processing units. Furthermore, the heat exchanger according to the present invention is not limited to a radiator, but may be an air conditioner condenser, an oil cooler, or other forms. [Explanation of Symbols]

[0083] 1. Hydraulic excavator (working machine) 10 Lower running body 12 Upper rotating body 121 Swivel Frame 13 Cab 15 Counterweight 15H Counterweight Vent (Weight Vent) 16 Exterior Panels 16H Exterior Panel Ventilation (Panel Ventilation) 17. Opening / closing door (opening / closing section) 20 work attachments 30 Engine 31. Radiator (heat exchanger) 32 Cooling fan (fan) 33 Exhaust gas aftertreatment device 331 First Processing Unit 332 Second Processing Unit 33A 1st side 33B 2nd side 50 Support part 51 Support 511 Support plate (vertical plate) 512 Rear side plate 513 Front side plate 514 Bottom plate (lower plate) 51H Ventilation opening (vertical plate ventilation opening) 52 mounting bases 521 1st leg (leg) 522 Second leg (leg) 523 Third leg (leg) 524 Top plate 525 Reinforcement section (reinforcement member) G ground

Claims

1. A slewing frame supported by a lower running body and having an upper surface, The engine positioned on the upper surface, An exhaust gas aftertreatment device for purifying the exhaust gas of the engine, having a first side surface and a second side surface opposite to the first side surface in the horizontal direction, A support portion is provided on the upper surface and supports only the first side of the first side and second side of the exhaust gas aftertreatment device so that the exhaust gas aftertreatment device is adjacent to the engine, A heat exchanger including a rotating fan is positioned on the upper surface of the swing frame adjacent to the engine, Equipped with, The support portion includes a vertical plate positioned opposite the first side surface, The vertical plate has vertical plate vents that penetrate the vertical plate along the horizontal direction. The fan has a rotating shaft that extends in a direction in which the vertical plate vents penetrate the vertical plate, The aforementioned exhaust gas aftertreatment device is A first processing unit for removing a first component from the exhaust gas, A second processing unit is positioned at a distance from the first processing unit in the vertical direction and removes a second component from the exhaust gas, It has, When the vertical plate vent is viewed along the direction in which it penetrates the vertical plate, The vertical plate extends vertically so as to face at least a portion of the first processing section and at least a portion of the second processing section, The vertical plate vent is formed to overlap the space between the first processing section and the second processing section. A working machine in which the first processing unit and the second processing unit are fixed to the vertical plate by a fixing member so that the airflow generated by the fan can flow through the vertical plate vent and the space along the direction in which the vertical plate vent penetrates the vertical plate.

2. The aforementioned support portion is The support including the aforementioned vertical plate, A frame is positioned on the upper surface of the swing frame, further outward in the left-right direction from the engine, and supports the support structure. It has, The aforementioned frame is A top plate that supports the aforementioned support, Multiple legs extending downward from the top plate and fixed to the upper surface of the swivel frame, The work machine according to claim 1, having the following features.

3. The support further comprises a lower plate that is positioned to overlap the top plate and fixed to the top plate. The plurality of legs include a first leg and a second leg, The work machine according to claim 2, wherein the frame further comprises a reinforcing member that connects the first leg portion and the second leg portion to each other below the top plate, and is arranged to intersect with the bottom plate in a plan view.

4. The work machine according to claim 3, wherein in a plan view, the reinforcing member is arranged parallel to the vertical plate.

5. A slewing frame supported by a lower traveling body and having an upper surface, The engine positioned on the upper surface, An exhaust gas aftertreatment device for purifying the exhaust gas of the engine, having a first side surface and a second side surface opposite to the first side surface in the horizontal direction, A support portion is provided on the upper surface and supports only the first side of the first side and second side of the exhaust gas aftertreatment device so that the exhaust gas aftertreatment device is adjacent to the engine, A heat exchanger including a rotating fan is positioned on the upper surface of the swing frame adjacent to the engine, The engine and the exhaust gas aftertreatment device are covered by an exterior panel, The support portion includes a vertical plate positioned opposite the first side surface, The exhaust gas aftertreatment device is fixed to the vertical plate by a fixing member, The vertical plate has vertical plate vents that penetrate the vertical plate along the horizontal direction. The exterior panel has a panel vent formed therein, which is positioned to overlap the vertical vent when viewed along the direction in which the vertical vent penetrates the vertical plate, in a working machine.

6. A slewing frame supported by a lower traveling body and having an upper surface, The engine positioned on the upper surface, An exhaust gas aftertreatment device for purifying the exhaust gas of the engine, having a first side surface and a second side surface opposite to the first side surface in the horizontal direction, A support portion is provided on the upper surface and supports only the first side of the first side and second side of the exhaust gas aftertreatment device so that the exhaust gas aftertreatment device is adjacent to the engine, A heat exchanger including a rotating fan is positioned on the upper surface of the swing frame adjacent to the engine, The system comprises a counterweight supported by the aforementioned slewing frame, The support portion includes a vertical plate positioned opposite the first side surface, The exhaust gas aftertreatment device is fixed to the vertical plate by a fixing member, The vertical plate has vertical plate vents that penetrate the vertical plate along the horizontal direction. A working machine having a weight vent formed in the counterweight such that it overlaps with the vertical plate vent when viewed along the direction in which the vertical plate vent penetrates the vertical plate.

7. A slewing frame supported by a lower traveling body and having an upper surface, The engine positioned on the upper surface, An exhaust gas aftertreatment device for purifying the exhaust gas of the engine, having a first side surface and a second side surface opposite to the first side surface in the horizontal direction, A support portion is provided on the upper surface and supports only the first side of the first side and second side of the exhaust gas aftertreatment device so that the exhaust gas aftertreatment device is adjacent to the engine, The engine and the exhaust gas aftertreatment device are covered by an exterior panel, The exterior panel has an opening / closing section that can change between an open state and a closed state, wherein the open state is a state in which the opening / closing section opens the vertical plate of the support section to the outside, and the closed state is a state in which the opening / closing section covers the vertical plate. The support portion includes the vertical plate which is positioned opposite the first side surface and opposite the opening / closing portion, The exhaust gas aftertreatment device is fixed to the vertical plate by a fixing member, A work machine that allows external access to the aforementioned fixing member when it is in the open state.

8. A slewing frame supported by a lower traveling body and having an upper surface, The engine positioned on the upper surface, An exhaust gas aftertreatment device for purifying the exhaust gas of the engine, having a first side surface and a second side surface opposite to the first side surface in the horizontal direction, A support portion is provided on the upper surface and supports only the first side of the first side and second side of the exhaust gas aftertreatment device so that the exhaust gas aftertreatment device is adjacent to the engine, Equipped with, The aforementioned exhaust gas aftertreatment device is A first processing unit for removing a first component from the exhaust gas, A second processing unit is positioned at a distance from the first processing unit in the vertical direction and removes a second component from the exhaust gas, It has, The support portion includes a vertical plate positioned opposite the first side surface, The vertical plate extends vertically so as to face at least a portion of the first processing section and at least a portion of the second processing section, A working machine in which each of the first and second processing units is fixed in the thickness direction of the vertical plate by a fixing member.

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