Construction machine

Abstract

To provide a construction machine capable of improving maintainability of parts arranged in a machine room.SOLUTION: A hydraulic shovel 1 is provided with: a revolving frame 7; an operation room 5 provided on the revolving frame 7, a rear side of which is capable of moving vertically around a front side as a fulcrum; and a machine room 35 provided on the revolving frame 7 and receiving a plurality of loaded parts thereinside. The plurality of loaded parts includes: a first part connected to the operation room 5 movably in an upper direction with the operation room 5; and a second part left on the revolving frame 7 in a state the first part moves upward with the operation room 5. The first part includes an exhaust gas post-treatment device 9 purifying exhaust gas of an engine 6.SELECTED DRAWING: Figure 8

Description

[Technical Field]

[0001] The present invention relates to a construction machine equipped with an item that requires maintenance. [Background technology]

[0002] Patent Document 1 discloses a construction machine having a vehicle body capable of traveling in forward and backward directions, an engine mounted on the vehicle body, a hydraulic pump attached to the engine with multiple bolts, an aftertreatment device frame mounted on the vehicle body straddling the upper side of the hydraulic pump, and an exhaust gas aftertreatment device attached to the aftertreatment device frame for aftertreatment of exhaust gas from the engine, the aftertreatment device frame having a pair of support legs erected on the vehicle body facing each other in the forward and backward directions with the hydraulic pump between them, and a support member mounted on the pair of support legs and to which the exhaust gas aftertreatment device is attached.In Patent Document 1, a pump housing chamber for housing the hydraulic pump is formed between the pair of support legs and the support member, i.e., below the frame, thereby ensuring maintenance space for the hydraulic pump. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2020-45658 Summary of the Invention [Problem to be solved by the invention]

[0004] However, as in Patent Document 1, if parts requiring maintenance (items to be maintained), such as hydraulic pumps, are stored below a stand with an exhaust gas aftertreatment device attached to the upper side, the above of the items to be maintained will be covered by the stand and the exhaust gas aftertreatment device, making it difficult to visually inspect the items to be maintained from above or to perform maintenance work.

[0005] The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a construction machine that can improve the maintainability of parts arranged inside the machine room. [Means for solving the problem]

[0006] In order to achieve the above object, the present invention provides a construction machine comprising a body frame, a cab provided on the body frame and having a rear side that is movable up and down with the front side as a fulcrum, and a machine room provided on the body frame and accommodating a plurality of mounted items therein, wherein the plurality of mounted items include a first part that is connected to the cab so as to be movable upward together with the cab, and a second part that is placed on the body frame when the first part has moved upward together with the cab, and the first part includes an exhaust purification device that purifies engine exhaust. [Effects of the Invention]

[0007] According to the present invention, it is possible to improve the maintainability of parts arranged in a machine room. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is an external view showing a hydraulic excavator according to an embodiment of the present invention. [Figure 2] FIG. 2 is a rear view showing the internal structure of the upper rotating body with the exterior cover and counterweight omitted. [Figure 3] FIG. 3 is a cross-sectional side view taken along a cross section corresponding to the cross section AA in FIG. 2. [Figure 4] FIG. 1 is an explanatory diagram showing a schematic configuration of an exhaust gas aftertreatment device. [Figure 5] FIG. 3 is an enlarged view of part B in FIG. [Figure 6] FIG. 4 is a left side view showing the structure in the vicinity of the support member, the engine, and the hydraulic pump in FIG. 3. [Figure 7] FIG. 4 is an enlarged view of part C in FIG. [Figure 8]FIG. 2 is a left side view showing the exhaust gas aftertreatment device, the first and second support members, and the upper rotating body with the operator's cab tilted up. [Figure 9] FIG. 2 is a perspective view showing the overall structure of the floor member. [Figure 10] FIG. 10 is an exploded perspective view showing the engagement relationship between the bracket of the floor member and the tilt support member. [Figure 11] FIG. 10 is a perspective view showing an upper rotating body in a tilted-up state in a modified example in which only a second support member among the support members is tilted up together with the operator's cab. DETAILED DESCRIPTION OF THE INVENTION

[0009] Below, a small hydraulic excavator suitable for work in a narrow work site will be described as an example of a construction machine according to one embodiment of the present invention with reference to the drawings. In the following description, the up-down direction, the front-rear direction, and the left-right direction correspond to the directions of arrows appropriately shown in each drawing such as Fig. 1. In other words, "up," "down," "front," "rear," "left," and "right" in the drawings correspond to the up-down, left-right, and front-rear directions as seen from the operator seated in the cab 5.

[0010] <Overall configuration of hydraulic excavator> As shown in Fig. 1, a hydraulic excavator 1 serving as a construction machine according to this embodiment has a lower traveling body 2 capable of traveling forward and backward, and an upper rotating body 3 mounted on the lower traveling body 2 so as to be able to swing. A front working mechanism 4 is mounted on the front side of the upper rotating body 3 so as to be able to move up and down. The hydraulic excavator 1 can perform work such as excavating earth and sand using the front working mechanism 4. The upper rotating body 3 has a swing frame 7 serving as a vehicle frame that is swingably mounted on the lower traveling body 2. A counterweight 32 is provided on the rear end of the swing frame 7 to balance the weight of the swing frame 7 with the front working mechanism 4.

[0011] <Internal structure of the upper rotating body> Fig. 2 shows a rear view of the internal structure of the upper rotating body 3 with an exterior cover 33 and a counterweight 32 (described later) omitted, and Fig. 3 shows a side cross-sectional view taken along the line AA in Fig. 2. As shown in Figs. 2 and 3 and Fig. 1, an operator's cab 5, in which an operator sits, is provided on the front left side of the upper rotating body 3. The operator's cab 5 is provided on a revolving frame 7. The operator's cab 5 is formed by a floor member 25 that forms the lower part of the operator's cab 5, and a cab box 34 that is provided on the floor member 25 and defines the operator's cab 5.

[0012] <Machine room> A machinery room 35 accommodating a plurality of mounted components is formed on the rotating frame 7. The machinery room 35 is formed between the operator's cab 5 and the counterweight 32 in the front-rear direction. Inside the machinery room 35, mounted components include an engine 6, a hydraulic pump 8, and an exhaust gas after-treatment device 9 serving as an exhaust purification device. An exterior cover 33 that covers these mounted components is provided on the rotating frame 7. That is, FIG. 2 shows the internal structure of the upper rotating body 3 with the exterior cover 33 and counterweight 32 omitted.

[0013] The engine 6 is a prime mover that serves as the power source for the hydraulic excavator 1, and is disposed at the bottom inside the machine room 35. The engine 6 is mounted on a revolving frame 7 in a horizontal position extending left and right. The hydraulic pump 8 is a pump that is driven by the engine 6, and is attached to the left side of one end of the engine 6, at the bottom inside the machine room 35. This hydraulic pump 8 discharges pressurized oil and supplies it to various hydraulic actuators to drive the front working mechanism 4, etc.

[0014] <Exhaust gas treatment device> The exhaust gas aftertreatment device 9 is a device that purifies exhaust gas from the engine 6, and as shown in Fig. 2, is attached to a support member 10 and disposed above the hydraulic pump 8 in the upper part of the interior of the machinery compartment 35. That is, the exhaust gas aftertreatment device 9 and the support member 10 are disposed above the hydraulic pump 8 when they are not rotated upward together with the operator's cab 5 as described below.

[0015] The schematic configuration of the exhaust gas after-treatment device is shown in Fig. 4. In Fig. 4, the exhaust gas after-treatment device 9 includes a first exhaust gas after-treatment device 9a, a second exhaust gas after-treatment device 9b, a connecting pipe 9c, and an exhaust tail pipe 11 as an exhaust pipe.

[0016] The first exhaust gas aftertreatment device 9a is provided with an oxidation catalyst 17. The oxidation catalyst 17 oxidizes and removes carbon monoxide (CO), hydrocarbons (HC), and other substances contained in the exhaust gas. It also burns and removes particulate matter (PM) as needed.

[0017] The connecting pipe 9c connects the first exhaust gas after-treatment device 9a and the second exhaust gas after-treatment device 9b. A urea water injection nozzle 18 is attached to the rear end of the connecting pipe 9c. The urea water injection nozzle 18 injects urea water toward the exhaust gas flowing through the connecting pipe 9c.

[0018] The second exhaust gas aftertreatment device 9b is disposed diagonally above and to the right of the first exhaust gas aftertreatment device 9a when viewed from the rear (see FIG. 2 described above). The second exhaust gas aftertreatment device 9b is provided with a selective reduction catalyst 19 and an oxidation catalyst 20. The selective reduction catalyst 19 is formed, for example, of a ceramic cellular cylinder, with its inner surface coated with a precious metal. The selective reduction catalyst 19 selectively reduces nitrogen oxides (NOx) contained in the exhaust gas emitted from the engine 6 with ammonia in the urea aqueous solution injected from the urea aqueous solution injection nozzle, decomposing the NOx into nitrogen and water. On the other hand, the oxidation catalyst 20 is coated with a precious metal on its inner surface, similar to the oxidation catalyst 17 described above. As a result, the oxidation catalyst 20 oxidizes the residual ammonia remaining after the selective reduction catalyst 19 reduces the NOx, separating it into nitrogen and water. In this way, the exhaust gas emitted from the engine 6 is purified by the exhaust gas aftertreatment device 9 and released into the outside air through the exhaust tail pipe 11 connected to the second exhaust gas aftertreatment device 9b.

[0019] <Exhaust pipe> The exhaust gas aftertreatment device 9 is connected to the engine 6 via an aftertreatment device side exhaust pipe 21 and an engine side exhaust pipe 22 , and treats harmful substances contained in the exhaust gas from the engine 6 . That is, as shown in Fig. 2 and Fig. 5, which is an enlarged view of part B in Fig. 2, exhaust gas from the engine 6 is introduced into the exhaust gas aftertreatment device 9 through the engine-side exhaust pipe 22 and the aftertreatment device-side exhaust pipe 21 and purified there. The engine-side exhaust pipe 22 is an exhaust pipe connected to the exhaust side of the engine 6. The aftertreatment device-side exhaust pipe 21 is an exhaust pipe connected to the inlet side of the exhaust gas aftertreatment device 9. The aftertreatment device-side exhaust pipe 21 and the engine-side exhaust pipe 22 are fastened to each other using bolts 23 and nuts 24 at their respective flanges 21a and 22a. That is, the flanges 21a, 22a, bolts 23, and nuts 24 correspond to connecting members.

[0020] <First Support Member and Second Support Member> Fig. 6 is a left side view showing the structure around the support member, engine, and hydraulic pump in Fig. 3, and Fig. 7 is an enlarged view of part C in Fig. 3. As shown in Figs. 6, 7, and the above-mentioned Fig. 2, the exhaust gas aftertreatment device 9 is housed in and supported by a support member 10. The support member 10 has a first support member 10a as a lower cover and a second support member 10b as an upper cover.

[0021] The first support member 10a has a U-shape when viewed from the front-rear direction, and covers the lower part of the exhaust gas after-treatment device 9, and in this example, also covers the left and right sides of the exhaust gas after-treatment device 9. The second support member 10b is located on the first support member 10a and covers the upper part of the exhaust gas after-treatment device 9. In this example, in particular, it is arranged so as to overlap the upper left and upper right ends of the first support member 10a. As a result, the support member 10 consisting of the first support member 10a and the second support member 10b has a roughly cylindrical shape that forms the outer shell of the air passage that flows around the exhaust gas after-treatment device 9 in the front-rear direction.

[0022] The first exhaust gas aftertreatment device 9a is disposed in the lower left region inside the support member 10 when viewed from the rear (see FIG. 2), and the second exhaust gas aftertreatment device 9b is disposed in the upper right region inside the support member 10 when viewed from the rear (see FIG. 2). The exhaust tail pipe 11 extends upward from the second exhaust gas aftertreatment device 9b and is disposed so as to protrude above the first support member 10a.

[0023] The first support member 10a is configured to be connectable to and disconnectable from the second support member 10b by bolts 13b. The bolts 13b fasten the second support member 10b to the first support member 10a at the portions where the upper left and upper right ends of the second support member 10b and the first support member 10a overlap.

[0024] <Support legs> 6 and 3, the support member 10 is supported by a pair of support legs 12 erected on one side and the other side of the hydraulic pump 8. That is, the support legs 12 are composed of a first support leg 12a arranged on the rear side of the hydraulic pump 8 and a second support leg 12b arranged on the front side of the hydraulic pump 8.

[0025] The support legs 12a, 12b are fixed to the revolving frame 7 by welding, bolts (not shown), or the like. The support legs 12a, 12b are configured to be detachably connected to the support member 10 located on the support legs 12 by bolts 13a serving as fastening members (connecting members). The bolts 13a fasten the first support member 10a to the support legs 12a, 12b at the portions where the bottom surface of the first support member 10a constituting the support member 10 comes into contact with the upper ends of the support legs 12a, 12b. In other words, the first support member 10a is detachably connected to the revolving frame 7 via the support legs 12a, 12b by the bolts 13a.

[0026] <Third support member> 6 and 7, the support member 10 further includes a third support member 10c, which is fixed to the second support member 10b by welding or the like. Specifically, the third support member 10c has an inverted U-shape when viewed from the front-rear direction, and is fixed to the front upper surface of the second support member 10b. The second support member 10b supports a floor member 25 via a floor support bracket 14, and as a result, the second support member 10b is fixed to the floor member 25 of the cab 5.

[0027] <Floor support bracket> 7, the floor support bracket 14 has a lower bracket 14a and an upper bracket 14b, which are combined in an up-down direction to form a box shape. Rubber mounts 15 are arranged between the lower bracket 14a and the upper bracket 14b in the up-down direction and above the upper bracket 14b.

[0028] The floor member 25 is placed on the upper rubber mount 15 of the upper bracket 14b and is integrated together with the floor support bracket 14 and rubber mount 15 by fastening them together with bolts 13c. At this time, the lower floor support bracket 14a and the third support member 10c are fastened with bolts 13d, so that the integrated floor member 25, rubber mount 15, and floor support bracket 14 are placed on the third support member 10c. In this way, the floor member 25 is supported by the support member 10.

[0029] <Tilt up the driver's cab> In the hydraulic excavator 1 of this embodiment configured as described above, the operator's cab 5 is configured so that the rear side is movable up and down with the front side as a fulcrum, and more specifically, the front end of the floor member 25 is connected to the revolving frame 7 so as to be able to rotate upward. That is, as shown in FIG. 3 above, a tilt support member 26 (see FIG. 10 described later) is provided between brackets 25a, 25b provided on the front part of the floor member 25 and the front part of the revolving frame 7. As shown in FIG. 8, the floor member 25 is supported on the revolving frame 7 via the tilt support member 26 so as to be tiltable (so-called tilt up) together with the cab box 34 about the tilt support member 26.

[0030] <Tilt support member> Fig. 9 is a perspective view showing the overall structure of floor member 25, and Fig. 10 is an exploded perspective view showing the engagement relationship between brackets 25a, 25b of floor member 25 and tilt support member 26. As shown in Figs. 9 and 10, brackets 25a, 25b are provided at the front of floor member 25 in correspondence with tilt support member 26, and these brackets 25a, 25b are attached to the swivel frame 7 via tilt support member 26. Tilt support member 26 is attached to the swivel frame 7 with bolts 28. Brackets 25a, 25b have pin holes 25a1, 25b1 formed in coaxial alignment.

[0031] Meanwhile, the tilt support member 26 is provided with a rubber mount portion 27 having a pin hole 27a formed therein. A washer 29 having a pin hole 29a formed therein is disposed coaxially with the pin hole 27a. The brackets 25a and 25b of the floor member 25 are connected to the tilt support member 26 via pins 30 that pass through the pin holes 25a1, 27a, 25b1, and 29a. A pin anti-rotation hole 30a is formed at the end of the pin 30. Correspondingly, a screw hole 25b2 is formed in the bracket 25b. The bracket 25b is further connected to the tilt support member 26 by inserting the pin 30 into the pin anti-rotation hole 30a and fastening it to the screw hole 25b2.

[0032] The tilt support members 26 are respectively disposed at the left front and right front of the revolving frame 7. Via these two tilt support members 26, the front portion of the floor member 25 is supported in a vibration-damped state so as to be able to rotate upward relative to the revolving frame 7, with an axis extending in the left-right direction as the rotation axis. As a result, the operator's cab 5 can be switched between a state in which it is rotated upward (=tilt up, corresponding to FIG. 8) and a state in which it is not rotated upward (=tilt down, corresponding to FIG. 3).

[0033] <First part and second part> As a feature of this embodiment, when the cab 5 is tilted up as shown in FIG. 8, the support member 10 supported by the floor member 25 of the cab 5 and the exhaust gas aftertreatment device 9 supported by this support member 10 are configured to be able to move (rotate) upward together with the cab 5. At this time, the exhaust gas aftertreatment device 9 is disconnected from the engine 6. That is, the bolts 23 and nuts 24 described above are loosened to disconnect the engine-side exhaust pipe 22 from the aftertreatment device-side exhaust pipe 21 (see FIG. 5 above). Also, the connection between the support member 10 and the support legs 12 is released. That is, the bolts 13a are loosened to release the connection between the first support member 10a and the support legs 12a, 12b (see FIG. 6 above).

[0034] As a result of the above, as shown in Figure 8, the exhaust gas aftertreatment device 9 and support member 10 connected to the cab 5 can move (rotate) upward together with the cab 5, while the hydraulic pump 8, engine 6, support legs 12, etc. are left on the swivel frame 7. This creates a space above the machinery room 35 that allows access to the hydraulic pump 8, making it possible to perform maintenance on the hydraulic pump 8.

[0035] In the above description, the exhaust gas aftertreatment device 9 and the support member 10 correspond to a first part that is connected to the cab 5 so as to be movable upward together with the cab 5 (in the present specification, the first part includes at least the exhaust gas aftertreatment device 9). Furthermore, the hydraulic pump 8, engine 6, support legs 12, etc. correspond to a second part that is placed on the revolving frame 7 when the first part is rotated upward together with the cab 5. Among these, the hydraulic pump 8 corresponds to an item that requires maintenance.

[0036] <Effects of the embodiment> As described above, in the hydraulic excavator 1 of this embodiment, a plurality of mounted components (engine 6, hydraulic pump 8, exhaust gas aftertreatment device 9, support member 10, support leg 12, etc.) are housed inside the machine room 35. The plurality of mounted components include at least one first component (exhaust gas aftertreatment device 9 and support member 10 in the above example) connected to the operator's cab 5 so as to be movable upward together with the operator's cab 5, and at least one second component (engine 6, hydraulic pump 8, support leg 12, etc. in the above example) placed on the revolving frame 7 in a state in which the first component has moved upward together with the operator's cab 5. The second component includes at least one item that requires maintenance (hydraulic pump 8 in the above example). As a result, when the operator's cab 5 is rotated relative to the revolving frame 7 and moved upward (tilted up), the exhaust gas aftertreatment device 9 and the support member 10 can be rotated together with the operator's cab 5. As a result, it is possible to form a space above the hydraulic pump 8, which is the maintenance target, and the maintainability of the hydraulic pump 8 can be improved. That is, in a configuration in which the maintenance target is housed below a stand on which an exhaust gas aftertreatment device is attached above, as in the above-mentioned Patent Document 1, the above of the maintenance target is covered by the stand and the exhaust gas aftertreatment device, making it difficult to visually check or perform maintenance work on the maintenance target from above. In this embodiment, such difficulties are resolved, and maintainability can be improved.

[0037] In particular, in this embodiment, connecting members (in the above example, flanges 21a, 22a, bolts 23 and nuts 24) are provided to detachably connect the first component (in the above example, the exhaust gas aftertreatment device 9 and the support member 10) and the second component (in the above example, the engine 6, the hydraulic pump 8, the support leg 12, etc.). As a result, when the cab 5 is not rotated, the exhaust gas treatment device 9 and the engine 6 can be connected using the flanges 21a, 22a, bolts 23 and nuts 24, and when the exhaust gas aftertreatment device 9 and support member 10 are rotated together with the cab 5, the connection between the exhaust gas treatment device 9 and the engine 6 can be released.

[0038] In this embodiment, in particular, the support member 10 has a generally cylindrical shape that constitutes the outer contour of the air passage through which air flows around the exhaust gas aftertreatment device 9 in the front-rear direction. As a result, the support member 10 accommodates the exhaust gas after-treatment device 9 without obstructing the airflow that flows around the exhaust gas after-treatment device 9, and therefore the cooling effect of the airflow can be ensured. In particular, the following effect is also achieved: The exhaust gas aftertreatment device 9 becomes hot while the engine 6 is running. After the engine 6 is stopped, when the aforementioned left-side opening / closing cover (not shown) is opened to access the machinery compartment 35, in this embodiment, the left side of the exhaust gas aftertreatment device 9, i.e., the opening / closing cover side, is covered by the first support member 10a of the support member 10, so that it is possible to prevent direct contact with the hot exhaust gas aftertreatment device 9. Furthermore, the shape of the support member 10 leaves the exhaust gas aftertreatment device 9 open in the front-to-rear direction, ensuring a cooling effect.

[0039] The present invention is not limited to the above-described embodiment, and various modifications are possible without departing from the spirit and technical concept of the present invention. Such modifications will be described below in order. The same reference numerals will be used to designate parts equivalent to those in the above-described embodiment, and descriptions will be omitted or simplified as appropriate.

[0040] (1) When only the second support member is tilted up together with the driver's cab Fig. 11 is a perspective view showing the upper rotating body in the tilted-up state in this modified example. In Fig. 11, this modified example is configured such that, when the cab 5 is tilted up as described above, of the support members 10 supported by the floor member 25, only the second support member 10b can rotate upward together with the cab 5. At this time, in this modified example, the connection between the first support member 10a and the second support member 10b is released. That is, the connection between the first support member 10a and the second support member 10b is released by removing the bolt 13b described above (see Fig. 6 described above).

[0041] 11, the second support member 10b fixed to the cab 5 rotates upward together with the cab 5, while the first support member 10a, exhaust gas aftertreatment device 9, hydraulic pump 8, engine 6, support legs 12, etc. remain on the swivel frame 7. This creates a space above the machinery compartment 35 through which the exhaust gas aftertreatment device 9 can be accessed, allowing maintenance of the exhaust gas aftertreatment device 9 to be performed.

[0042] At this time, in this modified example, in response to the tilt-up behavior, a notch 10b1 is formed in the second support member 10b as shown in Fig. 11. In this example, the notch 10b1 is long in the front-rear direction and has a shape in which the rear end of the second support member 10b is cut out.

[0043] The notches 10b1 are formed at positions that allow the exhaust tail pipe 11 to pass through when the second support member 10b overlaps the upper left and right ends of the first support member 10a. The notches 10b1 allow the exhaust tail pipe 11 to pass through when the second support member 10b has not rotated upward together with the cab 5, and function to avoid interference with the exhaust tail pipe 11 when the connection between the second support member 10b and the first support member 10a is released and the second support member 10b rotates upward together with the cab 5. For this reason, the notches 10b1 have a length in the front-rear direction that can play a role in avoiding interference with the exhaust tail pipe 11.

[0044] Instead of the notch 10b1, a hole of a predetermined length that can play a role in avoiding interference with the exhaust tail pipe 11 when the second support member 10b rotates upward together with the cab 5 may be provided.

[0045] <Effects of the modified version> This modified example also achieves the same effects as the above embodiment. That is, similar to the above embodiment, a plurality of mounted components (engine 6, hydraulic pump 8, exhaust gas aftertreatment device 9, support member 10, support legs 12, etc.) are housed inside the machinery compartment 35. The first component includes a second support member 10b that covers the upper side of the exhaust gas treatment device 9 and is fixed to the cab 5, and a first support member 10a that covers the lower side of the exhaust gas treatment device 9 and is releasably connected to the second support member 10b and is also releasably connected to the revolving frame 7. The exhaust gas aftertreatment device 9 is fixed to the first support member 10a. As a result, when the cab 5 is rotated upward (tilted up) relative to the revolving frame 7, the connection between the first support member 10a and the second support member 10b is released, so that the second support member 10b can be rotated together with the cab 5. As a result, it is possible to form a space above the exhaust gas aftertreatment device 9 fixed to the first support member 10a, which is the maintenance target, and the maintainability of the exhaust gas aftertreatment device 9 can be improved.

[0046] In addition, in this modified example, the second support member 10b has a notch 10b1 (which may be a hole as mentioned above) that allows the exhaust tail pipe 11 to pass through when the second support member 10b is not moving upward together with the cab 5, and that prevents interference with the exhaust tail pipe 11 when the second support member 10b moves upward together with the cab 5 when the connection with the first support member 10a is released. This allows the exhaust tail pipe 11 to pass through the second support member 10b when the cab 5 is not rotating, and even when the second support member 10b rotates together with the cab 5, the exhaust tail pipe 11 does not hinder the rotational movement.

[0047] (2) Other maintenance items For example, in the above embodiment, the hydraulic pump 8 is described as an item that requires maintenance, but the item that requires maintenance is not limited to this.

[0048] That is, for example, the item to be maintained may be another member or device constituting the second component that does not tilt up together with the cab 5, such as the engine 6. Although not shown in FIGS. 8 and 11 , the hydraulic excavator 1 has a maintenance opening on the left side of the exterior cover 33, and an openable / closable cover that can open and close the maintenance opening. Therefore, among the items mounted on the revolving frame 7, those located on the left side of the machinery room 35 can be easily visually inspected and maintained through the maintenance opening by opening the openable / closable cover on the left side. On the other hand, it is difficult to visually inspect or perform maintenance on those located on the right side of the machinery room 35 even if the openable / closable cover on the left side is opened. In this embodiment, by moving the exhaust gas aftertreatment device 9 upward together with the cab 5 as described above, such equipment housed on the right side of the machinery room 35, such as the engine 6, can be easily accessed from the left side. That is, by tilting up the exhaust gas aftertreatment device 9 and the support member 10 together with the cab 5 as described above, a space that allows access to the engine 6 from the left side of the machinery room 35 appears, thereby improving the maintainability of the engine 6.

[0049] (3) Other <About the problem to be solved and the effects of the invention> The problems to be solved by the invention and the effects of the invention are not limited to those described above. That is, the present invention may solve problems or achieve effects not described above, or may solve only some of the problems or achieve only some of the effects described above.

[0050] <About the numbers and structure> Concerning the components illustrated in the embodiments and drawings, the shapes, values, and interrelationships between multiple components can be arbitrarily modified and improved within the scope of the technical concept of the present invention.

[0051] It should be noted that the term "equal" in the above description does not have a strict meaning. In other words, "equal" means "substantially equal," allowing for tolerances and errors in design and manufacturing.

[0052] In addition to the above, the methods according to the above embodiments and modifications may be used in appropriate combination.

[0053] Although not specifically illustrated, the present invention can be implemented with various modifications within the scope of the invention. [Explanation of symbols]

[0054] 1. Hydraulic excavator (construction machinery) 5. Driver's cab 6 Engine (second part) 7 Swing frame (body frame) 8 Hydraulic pump (second part) 9 Exhaust gas aftertreatment device (exhaust gas purification device, first part) 10 Support member 10a First support member (lower cover, first part) 10b Second support member (upper cover, first part) 10b1 Notch 11 Exhaust tailpipe (exhaust pipe) 12 Support legs 13a Bolts (fastening members, connecting members) 13b Nut 21a Flange (connecting member) 22a Flange (connecting member) 23 Bolt (connecting member) 24 Nut (connecting member) 25 Floor materials 35 Machine room

Claims

1. The body frame and a driver's cab provided on the vehicle body frame, the rear side of which is movable in the up and down direction with the front side as a fulcrum; a machine room provided on the body frame and accommodating a plurality of mounted items therein; The plurality of payloads include: a first part coupled to the cab so as to be movable upward together with the cab; a second component that is placed on the vehicle body frame in a state in which the first component has moved upward together with the cab; Including, The first part is Includes an exhaust purification device that purifies engine exhaust Construction machinery characterized by:

2. 2. The construction machine according to claim 1, The second part is the engine disposed inside the engine room; a hydraulic pump disposed inside the machinery chamber and driven by the engine; Construction machinery characterized by:

3. 3. The construction machine according to claim 2, The device further includes a connecting member for releasably connecting the first component and the second component. Construction machinery characterized by:

4. 4. The construction machine according to claim 3, a lower portion of the driver's cab is configured by a floor member whose front end is rotatably connected to the body frame; The second part is A pair of support legs are provided on either side of the hydraulic pump, The first part is a support member fixed to the floor member and configured to house and support the exhaust purification device; the exhaust gas purification device and the support member are disposed above the hydraulic pump in a state where they are not rotated upward together with the operator cab, The connecting member is a fastening member that releasably fastens the support leg to the support member that is positioned on the support leg when the support member is not rotated upward together with the floor member; Construction machinery characterized by:

5. 4. The construction machine according to claim 3, The first part is an upper cover that covers an upper portion of the exhaust purification device and is fixed to the operator's cab; a lower cover that covers a lower portion of the exhaust purification device, that is releasably connected to the upper cover, and that is releasably connected to the vehicle body frame, The exhaust purification device is fixed to the lower cover. Construction machinery characterized by:

6. 6. The construction machine according to claim 5, The upper cover and the lower cover are The outer periphery of the air passage that flows in the front-rear direction around the exhaust purification device is formed. Construction machinery characterized by:

7. 6. The construction machine according to claim 5, an exhaust pipe connected to the exhaust purification device, for releasing exhaust gas discharged from the engine and purified by the exhaust purification device into the outside air; The upper cover is A hole or notch is provided for passing the exhaust pipe through when the lower cover is not moving upward together with the driver's cab, and for avoiding interference with the exhaust pipe when the lower cover is released from connection to the lower cover and moves upward together with the driver's cab. Construction machinery characterized by:

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