Construction machinery

Abstract

To enable mounting of a large exhaust gas post-treatment device by ensuring a maximum space limited on a top plate of a frame even while ensuring strength of a support pillar.SOLUTION: A construction machine comprises: a turning frame 16 on which an engine is mounted; a frame 50 that is fixed to the turning frame; an exhaust gas post-treatment device 40 supported on the frame; and a muffler cover 31 that covers an upper part of the exhaust gas post-treatment device. The frame 50 has: a top plate 51 on which the exhaust gas post-treatment device is mounted; an offset bracket 52 that has a support pillar attachment 52c offset outside the top plate in a plan view; and a support pillar 60 that is attached to the support pillar attachment to support the muffler cover.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a construction machine. [Background technology]

[0002] BACKGROUND ART Conventionally, there is known a construction machine that includes a lower running body and an upper rotating body that is rotatably mounted on the lower running body, and in which a machine room is provided in the rotating frame of the upper rotating body to house an engine, a hydraulic pump, an exhaust gas aftertreatment device, etc.

[0003] Patent document 1 discloses a configuration in which a cover support frame that supports an opening / closing cover that covers the top of the machine room has a framework structure including multiple beams and multiple support legs, and the support legs extend upward from a rotating frame.

[0004] Patent Document 2 discloses a structure in which a vehicle body frame erected on a revolving frame includes multiple beams and multiple pillar members, with the pillar members arranged to extend upward from the revolving frame.

[0005] As for the configuration of the pillars supporting the cover that covers the top surface of the machine room, as in these conventional technologies, there was a configuration in which the pillars were erected on the rotating frame of the upper rotating body, or a configuration in which the pillars were erected on the top plate of the stand on which the exhaust gas aftertreatment device was placed. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Publication No. 2020-114963 [Patent Document 2] Patent No. 5382669 Summary of the Invention [Problem to be solved by the invention]

[0007] A configuration in which support columns are attached to the top plate of an exhaust gas aftertreatment device frame allows the support columns to be shorter than a configuration in which the support columns are attached to a rotating frame, thereby reducing bending moment and ensuring the strength of the support columns and providing excellent assembly ease. However, with this configuration, if the exhaust gas aftertreatment device becomes larger, the support columns on the top plate become an obstacle, limiting the size of the exhaust gas aftertreatment device that can be mounted. Therefore, while it is possible to expand the top plate to increase the space for mounting the exhaust gas aftertreatment device, the increased dimensions of the frame result in problems such as increased costs and the difficulty of installing the exhaust gas aftertreatment device and frame when lifted by a crane or the like.

[0008] The present invention was made in consideration of these points, and its purpose is to maximize the limited space on the top plate of the stand by arranging the pillars that support the cover of the machinery room in a way that ensures its strength while allowing a large exhaust gas aftertreatment device to be mounted. [Means for solving the problem]

[0009] In order to achieve the above object, the construction machine according to the present invention includes an offset bracket for offsetting the support column from the top plate.

[0010] Specifically, the first invention is: A rotating frame on which the engine is mounted; a mount fixed to the rotating frame; an exhaust gas aftertreatment device supported by the frame; a muffler cover that covers an upper portion of the exhaust gas aftertreatment device, The frame is a top plate on which the exhaust gas aftertreatment device is placed; an offset bracket having a support post mounting portion offset to the outside of the top plate in a plan view; and a support that is attached to the support mounting portion and supports the muffler cover.

[0011] With the above configuration, the support pillars can be offset from the top plate using the offset brackets, ensuring the strength of the support pillars and making the most of the limited space above the top plate. This increases the degree of freedom in layout, making it possible to place a larger exhaust gas aftertreatment device on the top plate than before.

[0012] The second invention is the first invention, The platform has platform legs extending from the top plate toward the swivel frame, and the offset brackets are fixed to the tops of the platform legs.

[0013] With the above configuration, since the offset bracket is fixed to the upper part of the stand leg, it is possible to pass piping and harnesses below the offset bracket, making effective use of the space below. In addition, since the offset bracket is easily accessible from above, maintenance is also improved.

[0014] The third invention is the second invention, the engine and the exhaust gas aftertreatment device are arranged side by side in the left-right direction of the revolving frame, the cradle has a plurality of the cradle legs, The offset bracket is fixed to one of the plurality of mount legs that is adjacent to the engine, and extends from the mount leg toward the engine.

[0015] According to the above configuration, by extending the offset bracket into the empty space around the engine, the limited space within the machinery room can be effectively utilized, and the support can be erected on the engine side, away from the exhaust gas aftertreatment device.

[0016] A fourth aspect of the present invention is the third aspect of the present invention, the exhaust gas aftertreatment device is disposed obliquely with respect to the front-rear direction of the revolving frame, The offset bracket is fixed to one of the frame legs adjacent to the engine that is closest to the exhaust gas aftertreatment device.

[0017] When a large exhaust gas aftertreatment device is placed at an angle, there is a concern that a support pillar located in a conventional position on the top plate may interfere with the exhaust gas aftertreatment device. However, with the above-described configuration, the offset bracket allows the support pillar to be offset from a position close to the exhaust gas aftertreatment device and installed in a position that does not interfere with the exhaust gas aftertreatment device, thereby increasing the flexibility of the layout. This makes it possible to place a larger exhaust gas aftertreatment device at an angle on the top plate than before.

[0018] The fifth invention is the fourth invention, The offset bracket has a platform mounting portion that is fixed to the platform leg, and a pillar support portion that has the pillar mounting portion to which the pillar is fixed, and is characterized in that the platform mounting portion and the pillar support portion form an L-shape in cross section, and has a reinforcing plate installed between the platform mounting portion and the pillar support portion.

[0019] According to the above configuration, the offset bracket has a reinforcing plate, so that the strength of the support pillar that supports the muffler cover can be ensured.

[0020] The sixth invention is the fifth invention, The engine cover that covers the top of the engine and the muffler cover are arranged adjacent to each other in the left-right direction of the rotating frame, and the support pillar is erected between the engine cover and the muffler cover.

[0021] According to the above configuration, the support pillar can be offset from the top plate by the offset bracket, and can be installed in a position that allows it to support both the engine cover and the muffler cover in a balanced manner.

[0022] A seventh aspect of the present invention is the sixth aspect of the present invention, A beam member extending in the front-rear direction of the revolving frame is fixed to an upper end of the support pillar, the exhaust gas aftertreatment device is disposed obliquely with respect to the front-rear direction of the revolving frame, The beam member has an interference avoidance portion formed by cutting out the beam member so as to avoid interference with the exhaust gas aftertreatment device.

[0023] With the above configuration, by placing the exhaust gas after-treatment device at an angle, it is possible to place a larger exhaust gas after-treatment device on the top plate of a stand of the same size as a conventional one. In addition, the interference avoidance section of the beam member prevents interference with the exhaust gas after-treatment device, so the exhaust gas after-treatment device can be placed closer to the engine, reducing the cost of the exhaust pipe without compromising functionality.

[0024] The eighth invention is the seventh invention, The beams are installed at the front and rear ends of a machinery compartment in which the engine and the exhaust gas aftertreatment device are housed, and the support pillars support the rear ends of the beams.

[0025] The above configuration enhances the support pillar's ability to support both the engine cover and the muffler cover in a balanced manner. In addition, by erecting the support pillar at the rear end between the engine cover and the muffler cover, it is possible to avoid interference with surrounding equipment and to effectively utilize the space in the machinery room. [Effects of the Invention]

[0026] According to the present invention, the limited space on the top plate of the stand can be maximized to mount a large exhaust gas aftertreatment device while ensuring the strength of the support column. [Brief explanation of the drawings]

[0027] [Figure 1] 1 is a schematic side view showing an example of a construction machine. [Figure 2] 1 is a perspective view showing an upper revolving body of a construction machine according to an embodiment. [Figure 3] 1 is a perspective view showing an upper revolving body of a construction machine according to an embodiment. [Figure 4] 1 is a perspective view showing an upper revolving body of a construction machine according to an embodiment. [Figure 5] 1 is a perspective view showing an upper revolving body of a construction machine according to an embodiment. [Figure 6] FIG. 1 is a perspective view of a construction machine stand according to an embodiment; [Figure 7] FIG. 2 is a perspective view of an offset bracket of the construction machine according to the embodiment. [Figure 8] FIG. 2 is a front view of the offset bracket of the construction machine according to the embodiment. [Figure 9] FIG. 1 is a plan view showing a main part of a construction machine according to an embodiment. [Figure 10] FIG. 2 is a rear view showing the main parts of the construction machine according to the embodiment. [Figure 11] FIG. 1 is a plan view showing a main part of a construction machine according to an embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0028] A construction machine according to an embodiment will be described below with reference to the drawings. Note that in some of the drawings, arrows indicate up-down and front-rear and left-right directions, and unless otherwise specified, up-down and other directions will be described according to the directions indicated by these arrows. In the following description, the front-rear direction of the swivel frame will be referred to simply as the "front-rear direction," the front side of the swivel frame will be referred to simply as the "front side," and the rear side of the swivel frame will be referred to simply as the "rear side." Also, the left-right direction of the swivel frame will be referred to simply as the "left side," and the right side will be referred to simply as the "right side." Note that in the left-right direction, the left side when viewed from the rear side to the front side will be referred to as the left, and the right side will be referred to as the right. Note that in the present invention, the term "offset" refers to the distance of the support pillar relative to the position of the top plate, and "offset" is used to mean moving the support pillar to a predetermined distance from the top plate.

[0029] Fig. 1 is a side view showing an example of a construction machine according to an embodiment, and Fig. 2 is a perspective view showing an upper rotating body of the construction machine according to an embodiment. Note that the upper rotating body in Fig. 2 does not have an attachment or a cab installed thereon.

[0030] As shown in Fig. 1, the construction machine 10 is composed of a crawler-type lower traveling body 11 and an upper rotating body 12 that is rotatably mounted on the lower traveling body 11. As also shown in Fig. 2, the upper rotating body 12 is provided with a rotating frame 16 as a vehicle body frame.

[0031] The swivel frame 16 is a sheet metal structure that is rotatably mounted on the upper part of the lower running body 11, and the upper surface of the swivel frame 16 is provided with an attachment 13, a cab 14, a machine room 15, a hydraulic oil tank 17, a fuel tank 18, a counterweight 19, etc.

[0032] The attachment 13 is installed at the front of the upper rotating body 12 and has a boom 13a, an arm 13b, and a bucket 13c. The boom 13a and other components move in conjunction with the extension and contraction of hydraulically controlled hydraulic cylinders 13d to perform work such as excavation. The boom 13a and other components are operated from a cab 14.

[0033] The cab 14 is, for example, a rectangular box-shaped operator's cabin and is installed at the front of the upper rotating body 12 adjacent to the attachment 13. A fuel tank 18 is disposed behind the cab 14, and an air cleaner 20 for filtering the intake air of the engine is disposed above the fuel tank 18.

[0034] A hydraulic oil tank 17 is disposed to the side of the fuel tank 18 and the air cleaner 20, facing each other across a central scaffolding 21. A staircase-like ascending step 22 is provided in front of the hydraulic oil tank 17 to guide workers to the central scaffolding 21.

[0035] The machinery room 15 is located at the rear of the upper rotating body 12 and extends in the left-right direction. The machinery room 15 houses an exhaust gas aftertreatment device 40 (see Figures 10 and 11) and power machinery such as an engine and a hydraulic pump (not shown). The exhaust gas aftertreatment device 40 is connected to the engine and treats the engine's exhaust gas.

[0036] The front side of the machinery room 15 is covered by a hydraulic oil tank 17 and a fuel tank 18, the left and right sides are covered by side covers 23, and the rear side is covered by a counterweight 19. The upper part of the machinery room 15 is covered by a muffler cover 31 and an engine cover 32, which are arranged adjacent to each other in the left-right direction. The engine and exhaust gas aftertreatment device are arranged side by side in the left-right direction of the revolving frame 16. In this embodiment, the exhaust gas aftertreatment device and hydraulic pump are mounted on the right rear end of the revolving frame 16, and the engine is mounted to the left of that.

[0037] As shown in Fig. 3, beams 70 are installed at the front and rear ends of the machinery compartment 15. To the right of the beams 70 is space X in which the exhaust gas aftertreatment device and hydraulic pump are housed, and to the left of the beams 70 is space Y in which the engine is housed. A frame 50 is disposed in space X in which the exhaust gas aftertreatment device and hydraulic pump are housed. The hydraulic pump is disposed below the frame 50, and the exhaust gas aftertreatment device is disposed above the frame 50. A muffler cover 31 covers the top of the hydraulic pump and exhaust gas aftertreatment device, and an engine cover 32 covers the top of the engine.

[0038] Figures 3 to 5 are all perspective views of the upper rotating body 12, but for ease of explanation of the inside of the machine room 15, they are shown with the equipment in the machine room and the counterweight 19 removed. Figure 3 shows the state from Figure 2 with the muffler cover 31 removed, Figure 4 shows the state from Figure 3 with the engine cover 32, beams 70, and decorative panel 82 removed, and Figure 5 shows the state from Figure 4 with the central scaffolding 21 and a skeletal member 81, described below, removed. During regular maintenance of the construction machine 10, members are removed in the order shown in Figures 2 to 5.

[0039] As shown in Figures 3 to 5, the revolving frame 16 has a bottom plate 16a, first frame members 16b extending in the front-to-rear direction at both left and right ends of the upper revolving body 12, and second frame members 16c extending in the front-to-rear direction at both front and rear ends of the upper revolving body 12. A pair of vertical plates 16d extending in the front-to-rear direction are erected from the bottom plate 16a between the left and right first frame members 16b, spaced apart from each other on the left and right. An attachment 13 is connected to the front portion of each vertical plate 16d, which protrudes upward. A reinforcing back plate 16e is formed at the upper end of the vertical plate 16d behind the central scaffolding 21. A substantially rectangular parallelepiped engine mount base 16g is formed on the top surface of the back plate 16e.

[0040] The revolving frame 16 has a pair of side pillars 16f, 16f that stand upright at a distance in the front-to-rear direction along the left first frame member 16b behind the fuel tank 18. The revolving frame 16 also has an intermediate pillar 16h that stands upright adjacent to the rear of the central scaffolding 21, between the muffler cover 31 and the engine cover 32. A platform 50 that supports an exhaust gas aftertreatment device 40 (see Figures 10 and 11) is disposed behind the hydraulic oil tank 17.

[0041] The machine room 15 is defined at the rear of the revolving frame 16 by using the first frame member 16b, the second frame member 16c, the side pillar members 16f, the intermediate pillar members 16h, the frame 50, and the like as a framework.

[0042] 6 is a perspective view of the mount 50. The mount 50 has a top plate 51 on which the exhaust gas aftertreatment device 40 is placed, an offset bracket 52 having a support column mounting portion 52c offset to the outside of the top plate 51 in a plan view, and a plurality of mount legs 53a, 53b, 53c, and 53d extending from the top plate 51 toward the revolving frame 16. The mount 50 is fixed to the revolving frame 16 so that the mount legs 53a, 53b, 53c, and 53d straddle the hydraulic pump disposed on the right side of the machine room 15.

[0043] In this embodiment, the platform 50 has a total of four platform legs 53a, 53b, 53c, and 53d fixed to the underside of a top plate 51 that is generally rectangular in plan view. The platform leg 53a fixed to the right front portion of the top plate 51 and the platform leg 53b fixed to the right rear portion have their lower ends fixed to brackets extending from the right first frame member 16b. The right platform legs 53a and 53b form columns on the right side of the machine room 15 that correspond to the left side column member 16f of the revolving frame 16. The platform leg 53c fixed to the left front portion of the top plate 51 and the platform leg 53d fixed to the left rear portion are shorter than the right platform legs 53a and 53b. The left platform legs 53c and 53d are fixed to the upper surface of the engine mount base 16g.

[0044] A mounting member 54 for mounting the exhaust gas aftertreatment device 40 is disposed on the upper surface of the top plate 51, extending obliquely from the front right to the rear left. In addition, a top plate support 55 for supporting the right rear portion of the muffler cover 31 is erected on the right rear portion of the top surface of the top plate 51.

[0045] The offset bracket 52 is fixed to the upper part of the left rear frame leg 53d, of the multiple frame legs 53a, 53b, 53c, and 53d, which is adjacent to the engine. The side adjacent to the engine is the center side of the revolving frame 16 in the left-right direction. In this embodiment, the frame leg adjacent to the engine is the frame legs 53c and 53d provided on the left side of the frame 50. The offset bracket 52 is a bracket for erecting a support column 60 for supporting the muffler cover 31 at a position offset from the top plate 51. The offset bracket 52 extends from the frame leg 53d toward the engine side, in other words, from the frame leg 53d toward the center side of the revolving frame 16 in the left-right direction, and is located above the engine mount base 16g.

[0046] In this embodiment, the exhaust gas aftertreatment device 40 is disposed at an angle relative to the front-to-rear direction, extending from the front right to the rear left. Therefore, the offset bracket 52 is fixed to the left rear frame leg 53d, which is one of the left frame legs 53c and 53d adjacent to the engine and is closer to the exhaust gas aftertreatment device 40. The left rear frame leg 53d is erected at a position overlapping with the exhaust gas aftertreatment device 40 in a plan view. The offset bracket 52 extends to the left from the frame leg 53d. Since the offset bracket 52 is positioned above the engine mount base 16g, assembly of the engine mount base 16g is easier than in a conventional configuration in which a support pillar is erected from a revolving frame.

[0047] Fig. 7 shows a perspective view of the offset bracket, and Fig. 8 shows a front view of the offset bracket. As shown in Figs. 7 and 8, the offset bracket 52 is separate from the mount 50. The offset bracket 52 has a shape like a bent flat plate, and has a mount mounting portion 52a that is bolted to the upper part of the left side of the mount leg 53d, and a column support portion 52b that is formed so as to bend from the upper end of the mount mounting portion 52a and extend to the left. The offset bracket 52 is formed in an L-shape in cross section by the mount mounting portion 52a and the column support portion 52b.

[0048] In this embodiment, the space behind the engine, in front of the counterweight 19, and to the left of the exhaust gas aftertreatment device 40 is a space that has traditionally been dead space. The pillar support part 52b extends toward this dead space continuing to the rear left. A pillar mounting part 52c for mounting a pillar 60 is provided on the upper surface of the left end of the pillar support part 52b.

[0049] The support pillar mounting portion 52c is located to the left of the mounting portion of the hydraulic pump that is installed below the base 50. The support pillar mounting portion 52c is also located to the left of the top plate 51. The support pillar mounting portion 52c and the support pillar 60 are formed in a U-shape in plan view.

[0050] The offset bracket 52 has a reinforcing plate 52d installed between the left side surface of the gantry mounting portion 52a and the lower surface of the column support portion 52b. The lower end of the reinforcing plate 52d is formed into an upwardly convex arc shape to relieve stress at the connection between the reinforcing plate 52d, the gantry mounting portion 52a, and the column support portion 52b. The column 60 is placed on the outside of the column mounting portion 52c, and two surfaces of its lower end are fastened to the column mounting portion 52c, and it is attached to the upper surface of the column support portion 52b.

[0051] 9 is a plan view showing the machinery compartment 15 with the muffler cover 31 and beam members 70 (described later) removed. When placing a larger exhaust gas after-treatment device 40 than conventional devices on a conventional top plate 51 of a predetermined size, it is possible to arrange the exhaust gas after-treatment device 40 at an angle relative to the front-to-rear direction. In this embodiment, as shown in FIG. 9, the exhaust gas after-treatment device 40 is arranged at an angle from the front right to the rear left.

[0052] Conventionally, a support pillar for supporting the muffler cover is placed on the top plate, making it impossible to place the exhaust gas after-treatment device at an angle like this. In this embodiment, the offset bracket 52 extends the support pillar support portion 52b to the left, allowing the support pillar 60 to be erected at a position offset from the top plate 51 in a plan view. This makes it possible to effectively utilize the space at the left rear, which was previously dead space, and also prevents interference with the support pillar 60 even when the exhaust gas after-treatment device 40 is placed at an angle on the top plate 51.

[0053] Fig. 10 is a rear view showing the machinery room 15 with the counterweight 19 removed. As shown in Fig. 9, the support pillar 60 is erected between the muffler cover 31 and the engine cover 32. The support pillar 60 faces the intermediate pillar member 16h in the front-rear direction.

[0054] 3, 4, and 10, a frame member 81 extending laterally is connected to the upper part of the support pillar 60. The frame member 81 is a member that supports the engine cover 32, and its ends are connected to the support pillar 60 and the side pillar member 16f, and its upper part is covered with a design panel 82.

[0055] FIG. 11 is a plan view showing the machinery compartment 15 with the muffler cover 31 removed. As shown in FIGS. 3 and 11, a beam 70 extending in the front-to-rear direction is disposed below the muffler cover 31 and the engine cover 32. The beam 70 is installed at the front and rear ends of the machinery compartment 15. The rear end of the beam 70 is fixed to the upper end of the support column 60, and the front end is fixed to the upper end of the intermediate column 16h. The exhaust gas aftertreatment device 40 is disposed on the right side of the beam 70. Although the engine is not shown, the left side of the beam 70 is the space Y in which the engine is accommodated. The beam 70 is a flat plate-shaped member and has an interference avoidance portion 71 formed by cutting out from the right side to the left side at the rear. The interference avoidance portion 71 is formed to avoid interference with the left rear portion of the exhaust gas aftertreatment device 40 that protrudes from the top plate 51.

[0056] In the construction machine 10 configured as described above, the base 50 supporting the exhaust gas after-treatment device 40 is equipped with an offset bracket 52, which makes it possible to offset the support columns 60, which were previously erected on the top plate, from the top plate 51. This ensures the strength of the support columns 60, ensures ample space above the top plate 51, and makes effective use of the left rear of the top plate 51, which was previously dead space. This increases the degree of freedom in layout within the limited space of the machine room 15, making it possible to install a larger exhaust gas after-treatment device 40 than before on a top plate 51 of the same size as before.

[0057] Furthermore, by fixing the offset bracket 52 to the upper part of the base leg 53d, the length of the support pillar 60 can be shortened to ensure strength, and it is also possible to route piping and harnesses below the offset bracket 52, allowing for effective use of space. Furthermore, access from above during maintenance is facilitated, facilitating disassembly and reassembly. Because the support pillar 52b is located at the top, maintenance of, for example, an engine mount or harnesses can be accessed without removing the support pillar 60. Furthermore, by making the offset bracket 52 separate from the base 50, it is detachable, allowing access to nearby components to be maintained by removing the offset bracket 52. By making it a separate part, it can be attached at any stage of the assembly process, resulting in excellent ease of assembly.

[0058] In addition, the offset bracket 52 is formed in an L-shape in cross section by the frame mounting portion 52a and the pillar support portion 52b, and has a reinforcing plate 52d installed between the left side surface of the frame mounting portion 52a and the underside of the pillar support portion 52b, thereby ensuring the strength of the pillar 60.

[0059] Furthermore, the support pillar 60 is offset from the top plate 51 and erected between the muffler cover 31 and the engine cover 32, thereby enabling the muffler cover 31 and the engine cover 32 to be supported in a well-balanced manner.

[0060] Furthermore, by placing the exhaust gas after-treatment device 40 at an angle, it becomes possible to place a larger exhaust gas after-treatment device 40 than before on the top plate 51 of a stand 50 of the same size as before. The interference avoidance parts 71 of the beam members 70 can prevent interference with the exhaust gas after-treatment device 40, so it becomes possible to place the exhaust gas after-treatment device 40 closer to the engine, and it is possible to reduce piping costs without impairing functionality.

[0061] In this embodiment, the offset bracket 52 is fixed to the left rear mount leg 53d and extends to the left, but this is not limitative. The position where the bracket is fixed and the offset direction can be appropriately selected depending on the layout of the exhaust gas aftertreatment device. [Explanation of symbols]

[0062] 10. Construction machinery 15 Machine room 16 Swivel frame 31 Muffler cover 32 Engine cover 40 Exhaust gas aftertreatment device 50 Mounting stand 51 Top plate 52 Offset bracket 52a Mounting part 52b Post support part 52c Pillar mounting part 52d Reinforcement plate 53a,53b,53c,53d Frame legs 60 pillars 81 Skeletal members 70 Beam material 71 Interference avoidance section

Claims

1. A rotating frame on which the engine is mounted; a mount fixed to the rotating frame; an exhaust gas aftertreatment device supported by the frame; a muffler cover that covers an upper portion of the exhaust gas aftertreatment device, The frame is a top plate on which the exhaust gas aftertreatment device is placed; an offset bracket having a support post mounting portion offset to the outside of the top plate in a plan view; a support attached to the support mounting portion and supporting the muffler cover.

2. 2. The construction machine according to claim 1, wherein the platform has platform legs extending from the top plate toward the swivel frame, and the offset brackets are fixed to upper portions of the platform legs.

3. the engine and the exhaust gas aftertreatment device are arranged side by side in the left-right direction of the revolving frame, The pedestal has a plurality of the pedestal legs, 3. The construction machine according to claim 2, wherein the offset bracket is fixed to one of the plurality of platform legs that is adjacent to the engine, and extends from the platform leg toward the engine.

4. the exhaust gas aftertreatment device is disposed obliquely with respect to the front-rear direction of the revolving frame, 4. The construction machine according to claim 3, wherein the offset bracket is fixed to one of the frame legs adjacent to the engine that is closest to the exhaust gas aftertreatment device.

5. 5. The construction machine according to claim 4, wherein the offset bracket has a platform mounting portion that is fixed to the platform leg, and a column support portion having the column mounting portion to which the column is fixed, the platform mounting portion and the column support portion forming an L-shape in cross section, and a reinforcing plate that is installed between the platform mounting portion and the column support portion.

6. 6. The construction machine according to claim 5, wherein an engine cover covering an upper portion of the engine and the muffler cover are arranged adjacent to each other in the left-right direction of the rotating frame, and the support pillar is erected between the engine cover and the muffler cover.

7. A beam member extending in the front-rear direction of the revolving frame is fixed to an upper end of the support pillar, 7. The construction machine according to claim 6, wherein the beam has an interference avoidance portion formed by cutting out the beam so as to avoid interference with the exhaust gas aftertreatment device.

8. 8. The construction machine according to claim 7, wherein the beams are installed at the front and rear ends of a machine room in which the engine and the exhaust gas aftertreatment device are housed, and the support columns support the rear ends of the beams.

Images