JP7495856B2 - Construction Machinery - Google Patents

Description

This disclosure relates to construction machinery such as hydraulic excavators equipped with engines.

Generally, hydraulic excavators, which are a typical example of construction machinery, are composed of a self-propelled lower running body, an upper rotating body that is rotatably mounted on the lower running body, and a working device that is mounted in front of the upper rotating body so that it can be raised and lowered.

The upper rotating body is provided with a rotating frame that forms a support structure and has a work device attached to the front, a counterweight provided to the rear of the rotating frame, an engine located in front of the counterweight and installed horizontally on the rotating frame extending in the left-right direction, an exhaust gas aftertreatment device located on one side of the engine in the left-right direction and treating the exhaust gas, an exterior cover consisting of a left side panel, a right side panel and a top panel having an opening for maintenance that are provided on the rotating frame to cover the engine and the exhaust gas aftertreatment device, an engine cover located above the engine and covering the opening of the top panel and can be opened and closed with the counterweight side as a fulcrum, an aftertreatment device cover located above the exhaust gas aftertreatment device so as to be aligned with one side of the engine cover and covering the opening of the top panel and can be opened and closed with the counterweight side as a fulcrum, and a tail pipe that protrudes upward from the aftertreatment device cover and is connected to the exhaust gas aftertreatment device (Patent Document 1).

JP 2016-069964 A

However, in the construction machine described in Patent Document 1, when the engine cover is opened to perform maintenance around the engine, the tail pipe is located near the maintenance space. This tail pipe is heated to a high temperature by the exhaust gas, and work cannot be performed until the temperature of the tail pipe has dropped, in consideration of the possibility of coming into contact with it during maintenance of the engine, etc. This causes a problem of reduced workability when performing maintenance.

The objective of one embodiment of the present invention is to provide a construction machine that allows maintenance to be performed without waiting for the tail pipe temperature to drop.

One embodiment of the present invention includes a vehicle body frame having a support structure and a working device attached to the front side thereof, a counterweight provided at the rear side of the vehicle body frame, an engine located in front of the counterweight and horizontally disposed on the vehicle body frame so as to extend in the left-right direction, an exhaust gas aftertreatment device located on one side of the engine in the left-right direction and for treating exhaust gas, an exterior cover including a left side plate, a right side plate and a top plate having an opening for maintenance, which are provided on the vehicle body frame so as to cover the engine and the exhaust gas aftertreatment device, an engine cover located above the engine and provided to cover the opening of the top plate and which can be opened and closed with the counterweight side as a fulcrum, and an exhaust gas aftertreatment device located above the exhaust gas aftertreatment device so as to be aligned with one side of the engine cover and connected to the opening of the top plate. In a construction machine comprising an aftertreatment device cover that is provided to cover an engine portion and can be opened and closed with the counterweight side as a fulcrum, and a tail pipe that protrudes upward from the aftertreatment device cover and is connected to the exhaust gas aftertreatment device, the construction machine further comprises a protective cover that is provided between the engine cover and the aftertreatment device cover and is deployed when the engine cover is opened, and when the engine cover is open and the aftertreatment device cover is closed, the protective cover is in an deployed state to cover the area between a maintenance space above the engine that is formed when the engine cover is opened and the tail pipe on the aftertreatment device cover, and when both the engine cover and the aftertreatment device cover are open, the protective cover is folded and stored between the engine cover and the aftertreatment device cover .

According to one embodiment of the present invention, maintenance can be performed without waiting for the tail pipe temperature to drop, improving work efficiency.

FIG. 1 is a left side view showing a hydraulic excavator according to an embodiment of the present invention. FIG. 2 is a plan view of the hydraulic excavator with a portion of the working implement omitted. FIG. 2 is an enlarged perspective view showing a rear portion of an upper rotating body. 4 is a perspective view of the engine cover with a portion thereof cut away to expose a protective cover, as viewed from the same position as in FIG. 3 . FIG. 4 is a perspective view of the engine cover opened and the protective cover deployed, seen from the same position as in FIG. 3 . FIG. 4 is a perspective view of the engine cover and the aftertreatment device cover when viewed from the same position as in FIG. 3 with the engine cover and the aftertreatment device cover open. FIG. 6 is a perspective view showing the rear portion of the upper rotating body in a state where the engine, the protective cover, etc. are omitted from FIG. 5 . FIG. 4 is a perspective view showing the engine-side sector plate alone. FIG. 4 is a perspective view showing the cover side fan plate alone. FIG. 4 is a perspective view showing the intermediate sector plate alone. FIG. 6 is a perspective view showing the hook in FIG. 5 alone. FIG. 6 is a side view showing the hook in FIG. 5 alone.

Below, a wheeled hydraulic excavator will be taken as an example of a representative construction machine according to an embodiment of the present invention, and will be described in detail with reference to Figures 1 to 12.

In Figures 1 and 2, the hydraulic excavator 1 is a wheeled hydraulic excavator equipped with a self-propelled wheeled undercarriage 2 having left and right front wheels 2A and left and right rear wheels 2B. The hydraulic excavator 1 is equipped with an upper rotating body 3 rotatably mounted on the undercarriage 2, and a working device 4 provided on the front side of the upper rotating body 3 so that it can be raised and lowered.

The rotating frame 5 is mounted on the lower traveling body 2 so that it can rotate. The rotating frame 5 constitutes a vehicle body frame that serves as a support structure for the upper rotating body 3. The working device 4 is attached to the front side of the rotating frame 5.

The counterweight 6 is attached to the rear of the revolving frame 5. The counterweight 6 serves as a weight that balances the weight of the work device 4. The counterweight 6 is formed in a roughly arc shape with the center of the rear surface protruding rearward.

As shown in Figures 5 and 6, the engine 7 is located on the revolving frame 5, in front of the counterweight 6. The engine 7 is, for example, a diesel engine, and is mounted horizontally extending in the left-right direction. A hydraulic pump (not shown) is attached to the right side of the engine 7. Meanwhile, a heat exchanger (neither shown) consisting of a radiator, oil cooler, etc. is disposed on the left side of the engine 7, facing a cooling fan.

As shown in FIG. 6, the exhaust gas aftertreatment device 8 is located on the right side of the engine 7, which is one side in the left-right direction, and is installed on the hydraulic pump. The exhaust gas aftertreatment device 8 is connected to the exhaust side of the engine 7, and removes harmful substances in the exhaust gas emitted from the engine 7 and reduces exhaust noise. The exhaust gas aftertreatment device 8 has the function of burning and removing harmful substances by taking in the exhaust gas from the engine 7 while it is still hot. The exhaust gas treated by the exhaust gas aftertreatment device 8 is then released to the outside (outside air) from the exhaust port 8A protruding upward through the tail pipe 20 described below.

As shown in FIG. 2, the hydraulic oil tank 9 is located in front of the exhaust gas aftertreatment device 8 and is provided on the rotating frame 5. This hydraulic oil tank 9 stores hydraulic oil to be supplied to various actuators mounted on the hydraulic excavator 1. Meanwhile, the fuel tank 10 is provided on the rotating frame 5 adjacent to the right side of the hydraulic oil tank 9. This fuel tank 10 stores fuel to be supplied to the engine 7.

The cab 11 is located in front of the engine 7 and is arranged on the left side of the revolving frame 5. The cab 11 is where the operator sits, and is equipped inside with a driver's seat where the operator sits, a steering wheel for driving, operating levers for work, etc. (none of which are shown).

The exterior cover 12 is provided on the rotating frame 5 so as to cover the engine 7 and the equipment including the exhaust gas aftertreatment device 8. The exterior cover 12 is provided between the counterweight 6 and the hydraulic oil tank 9, the fuel tank 10, and the cab 11. The exterior cover 12 is composed of a left side panel 13, a right side panel 14, and a top panel 15, which will be described later.

The left side panel 13 is located between the cab 11 and the counterweight 6 and covers the left side of the heat exchanger. On the other hand, the right side panel 14 is located between the fuel tank 10 and the counterweight 6 and covers the right side of the hydraulic pump and exhaust gas aftertreatment device 8.

The top plate 15 extends in the left-right direction between the upper edge of the left side plate 13 and the upper edge of the right side plate 14. The top plate 15 is located at the same height as the top surface of the counterweight 6. The top plate 15 has a maintenance opening 15A for maintaining the engine 7, exhaust gas aftertreatment device 8, etc. This opening 15A opens wide above the engine 7, exhaust gas aftertreatment device 8, and heat exchange device.

The heat exchanger cover 16 is located on the left side of the top plate 15 and covers the top side of the heat exchanger. The heat exchanger cover 16 is formed as a long box body in the front-rear direction with the bottom and right sides open, and the left side is attached to the top plate 15 so that it can be opened and closed. Here, when the heat exchanger cover 16 and the engine cover 17 described below are closed, for example, a part of the engine cover 17 engages with the heat exchanger cover 16, so that the heat exchanger cover 16 cannot be opened by itself. In other words, if the engine cover 17 is locked, the opening of the heat exchanger cover 16 can also be restricted.

The engine cover 17 is located above the engine 7 and covers the opening 15A of the top plate 15. The engine cover 17 is formed as a box body with an open bottom, and is made up of a front part 17A, a rear part 17B, a left part 17C, a right part 17D and a top part 17E.

As shown in FIG. 7, an engagement portion 17F is provided on the lower edge of the right side portion 17D, located on the front side of the right side portion 17A. When the engine cover 17 is closed, this engagement portion 17F engages with a connecting protrusion 19E of the aftertreatment device cover 19, which will be described later, thereby restricting the aftertreatment device cover 19 from moving independently in the door-opening direction.

The upper surface 17E is provided with a connecting bracket 17G that extends downward from a position near the front surface 17A on the lower surface. This connecting bracket 17G constitutes part of the connecting mechanism 28 described below. The connecting bracket 17G is located near the right surface 17D and consists of a rectangular plate that extends parallel to the right surface 17D. A long hole 17G1 is formed in the lower part of the connecting bracket 17G and extends laterally when the engine cover 17 is closed. The cover side fan plate 25 of the protective cover 21 is connected to the long hole 17G1 via a link member 29 described below.

Furthermore, as shown in Figs. 2 and 3, an opening/closing mechanism 17H having a handle 17H1 is provided on the top surface 17E. A key cylinder 17H2 that regulates the operation of the handle 17H1 is attached to the opening/closing mechanism 17H. As a result, when the engine cover 17 is closed, as shown in Fig. 3, the key cylinder 17H2 of the opening/closing mechanism 17H is operated to the locking side, thereby locking the engine cover 17 in the closed state. Furthermore, since the heat exchanger cover 16 described above and the after-treatment device cover 19 described below are engaged with the engine cover 17 in the closed state, the heat exchanger cover 16 and the after-treatment device cover 19 can also be locked together with the engine cover 17.

The engine cover 17 has a rear portion 17B located on the counterweight 6 side attached to the top plate 15 via multiple, for example, two, hinges 17J. The engine cover 17 is therefore attached to the top plate 15 so that it can be opened and closed with each hinge 17J as a fulcrum. This allows the engine cover 17 to rotate (open and close) between the closed position shown in Figures 3 and 4 and the open position (fully open position) shown in Figures 5, 6, and 7. In addition, a gas spring (not shown) is provided between the engine cover 17 and the exterior cover 12 to assist in opening and closing the engine cover 17.

The rear fixed cover 18 is located on the counterweight 6 side (rear side) and is provided to the right of the engine cover 17. The rear fixed cover 18 is formed as a box body with openings on the front and bottom sides, and is fixedly attached to the top plate 15. In addition, the aftertreatment device cover 19 is attached to the upper front side of the rear fixed cover 18 via a hinge 19F (described later) so as to be able to be opened and closed.

The aftertreatment device cover 19 is located on one side of the engine cover 17, i.e., in front of the rear fixed cover 18, and is arranged to be aligned to the right side of the right side portion 17D. The aftertreatment device cover 19 is located above the exhaust gas aftertreatment device 8 and covers the opening 15A of the upper plate 15. The aftertreatment device cover 19 is formed as a box body with openings on the lower and rear sides, and is made up of a front portion 19A, a left side portion 19B, a right side portion 19C, and an upper portion 19D.

As shown in FIG. 7, a connecting protrusion 19E is provided on the lower edge of the left side surface 19B, protruding to the left side at the front surface 19A side. This connecting protrusion 19E is connected to a long hole 24D of the engine side fan plate 24 that constitutes the protective cover 21, thereby forming a connecting mechanism together with the long hole 24D. In addition, when the engine cover 17 is in the closed state, the engaging portion 17F of the right side surface 17D engages with the connecting protrusion 19E from above.

Here, the rear of the top surface 19D of the post-treatment device cover 19 located on the counterweight 6 side is attached to the rear fixed cover 18 via multiple, for example, two, hinges 19F. Therefore, the post-treatment device cover 19 is attached to the top plate 15 so that it can be opened and closed with each hinge 19F as a fulcrum. This allows the post-treatment device cover 19 to rotate (open and close) between the closed door position shown in Figures 3, 4, 5, and 7 and the open door position (fully open position) shown in Figure 6. In addition, a gas spring (not shown) is provided between the post-treatment device cover 19 and the exterior cover 12 to assist in opening and closing the post-treatment device cover 19.

The axis of each hinge 19F that supports the aftertreatment device cover 19 so that it can be opened and closed is misaligned in the front-to-rear and up-down directions from the axis of each hinge 17J that supports the engine cover 17 so that it can be opened and closed. This causes a misalignment between the path taken when the aftertreatment device cover 19 is opened and closed and the path taken when the engine cover 17 is opened and closed.

The tail pipe 20 protrudes upward from the upper surface 19D of the aftertreatment device cover 19. The tail pipe 20 constitutes part of the exhaust pipe for discharging exhaust gas discharged from the engine 7 to the outside. The tail pipe 20 is connected to the exhaust port 8A of the exhaust gas aftertreatment device 8 when the aftertreatment device cover 19 is in the closed state. The tail pipe 20 becomes hot because high-temperature exhaust gas discharged from the exhaust gas aftertreatment device 8 flows through it.

Next, we will explain in detail the configuration and operation of the protective cover 21, which is a characteristic feature of this embodiment.

The protective cover 21 is provided between the engine cover 17 and the aftertreatment device cover 19. As shown in FIG. 5, the protective cover 21 covers the space between the maintenance space 22 above the engine 7, which is formed when the engine cover 17 is open, and the tail pipe 20 above the closed aftertreatment device cover 19.

The protective cover 21 is configured to include multiple fan-shaped plates that are continuous in the opening and closing direction of the engine cover 17. In detail, the protective cover 21 is configured to include a fulcrum member 23, an engine-side fan-shaped plate 24, a cover-side fan-shaped plate 25, an intermediate fan-shaped plate 26, and a connecting mechanism 28.

The fulcrum member 23 is the center, or the pivot point, of each of the sector plates 24, 25, and 26 when they rotate. When the engine cover 17 is closed, the fulcrum member 23 is located at the corner between the rear surface 17B and the right surface 17D, and is attached to the top plate 15 or a structure that supports the top plate 15. The fulcrum member 23 has a pin 23A that extends in the left-right direction, and the bases of each of the sector plates 24, 25, and 26 are rotatably attached to this pin 23A.

The engine side sector plate 24 is disposed on the engine 7 side. As shown in FIG. 8, the engine side sector plate 24 is formed as a sector plate centered on a pin hole 24A provided at a base having an acute angle (e.g., about 20 degrees). The engine side sector plate 24 has an arc groove 24B located on the outer diameter side and centered on the pin hole 24A. In addition, a long hole 24D is provided on the outer diameter side of the engine side sector plate 24 along a straight portion 24C on the engine 7 side. A hook 27, described below, is engaged with the arc groove 24B.

The long hole 24D is provided between the aftertreatment device cover 19 and the protective cover 21, and constitutes a connecting mechanism for allowing misalignment when the engine cover 17 and the aftertreatment device cover 19 are opened and closed. Specifically, the long hole 24D allows the connecting protrusion 19E to move, thereby allowing misalignment between the trajectory when the aftertreatment device cover 19 is opened and closed around each hinge 19F and the trajectory when the engine side fan plate 24 rotates around the pin hole 24A (pin 23A of the fulcrum member 23).

The cover-side fan plate 25 is disposed on the aftertreatment device cover 19 side. As shown in FIG. 9, like the engine-side fan plate 24, it is formed as a fan plate with a pin hole 25A at its center, which is provided at a base with an acute angle (for example, about 20 degrees). The cover-side fan plate 25 has an arc groove 25B located on the outer diameter side and centered on the pin hole 25A. The outer diameter side of the cover-side fan plate 25 has a notch 25D that is formed by cutting out the engine-side straight section 25C on the engine 7 side. The arc groove 25B engages with a hook 27, which will be described later. The notch 25D also avoids interference with the connecting protrusion 19E of the aftertreatment device cover 19 when the engine cover 17 is closed.

Furthermore, a connection hole 25F is provided on the outer diameter side of the cover side fan plate 25, located near the cover side straight section 25E on the post-treatment device cover 19 side. A connection pin 29A of a link member 29 of a connection mechanism 28, which will be described later, is connected to this connection hole 25F.

One or more, for example, two, intermediate fan plates 26 are disposed between the engine side fan plate 24 and the cover side fan plate 25. As shown in FIG. 10, like the engine side fan plate 24, the intermediate fan plate 26 is formed as a fan plate with a pin hole 26A at the center at the base with an acute angle (for example, about 20 degrees). The intermediate fan plate 26 has an arc groove 26B located on the outer diameter side and centered on the pin hole 26A. The outer diameter side of the intermediate fan plate 26 has a notch 26D that cuts out the straight part 26C on the engine 7 side. The arc groove 26B engages with a hook 27. The notch 26D also avoids interference with the connecting protrusion 19E of the aftertreatment device cover 19 when the engine cover 17 is closed.

A total of three hooks 27 are provided between the engine side fan plate 24 and the intermediate fan plate 26 on the engine 7 side, between the cover side fan plate 25 and the intermediate fan plate 26 on the aftertreatment device cover 19 side, and between the intermediate fan plate 26 on the engine 7 side and the intermediate fan plate 26 on the aftertreatment device cover 19 side. As shown in Figures 11 and 12, the hook 27 is made of an elliptical plate and has a flanged engagement pin 27A protruding in opposite directions on the front and back at the end sides in the longitudinal direction.

For example, the hook 27 engages one engagement pin 27A with the arc groove 24B of the engine-side fan plate 24, and engages the other engagement pin 27A with the arc groove 26B of the intermediate fan plate 26 on the engine 7 side adjacent to the engine-side fan plate 24. This allows the hook 27 to guide the engine-side fan plate 24 and the intermediate fan plate 26 to a storage position where they are fully overlapped and a deployment position where they are only partially overlapped. Similarly, the hook 27 also connects between the cover-side fan plate 25 and the intermediate fan plate 26 on the aftertreatment device cover 19 side, and between the intermediate fan plate 26 on the engine 7 side and the intermediate fan plate 26 on the aftertreatment device cover 19 side so as to be freely stored and deployed.

The connecting mechanism 28 is provided between the engine cover 17 and the protective cover 21, and allows misalignment when the engine cover 17 and the aftertreatment device cover 19 are opened and closed. The connecting mechanism 28 is configured to include the connecting bracket 17G (long hole 17G1) of the engine cover 17 and a link member 29. The link member 29 is made of a long plate body, and a connecting pin 29A is provided on one side in the longitudinal direction. Meanwhile, an engagement pin 29B with a flange is provided on the other side in the longitudinal direction of the link member 29, protruding on the opposite side to the connecting pin 29A.

The connecting mechanism 28 rotatably attaches the connecting pin 29A of the link member 29 to the connecting hole 25F of the cover side fan plate 25, and engages the engagement pin 29B of the link member 29 with the long hole 17G1 of the connecting bracket 17G of the engine cover 17. This allows the connecting mechanism 28 to connect the cover side fan plate 25 to the engine cover 17.

In addition, the connecting mechanism 28 allows the link member 29 to rotate freely, and the engagement pin 29B is engaged movably with the long hole 17G1. As a result, the connecting mechanism 28 allows for misalignment between the path of the engine cover 17 when it opens and closes with each hinge 17J as a fulcrum and the path of the cover side fan plate 25 when it rotates with the pin hole 25A (pin 23A of the fulcrum member 23) as a fulcrum.

When the engine cover 17 is closed, the protective cover 21 configured in this manner is located in the stored position shown in Fig. 4, as shown in Fig. 3. In this stored position, the protective cover 21 is housed inside the engine cover 17. On the other hand, when the engine cover 17 is open, as shown in Fig. 5, the intermediate fan plates 26 are connected and spread out between the engine side fan plate 24 connected to the aftertreatment device cover 19 and the engine side fan plate 24 connected to the engine cover 17, so that the protective cover 21 is in the deployed position. In this deployed position, the protective cover 21 can cover the area between the maintenance space 22 and the tail pipe 20.

The wheeled hydraulic excavator 1 according to this embodiment has the configuration described above. Next, the operation of the wheeled hydraulic excavator 1 will be described.

The operator gets into the cab 11, sits in the driver's seat, and starts the engine 7. In this state, by operating a handle for travel and the like arranged inside the cab 11, the operator can drive the lower traveling body 2 and move the hydraulic excavator 1 forward or backward. In addition, by operating a control lever for work, the operator can perform work such as excavating soil and sand using the work device 4 while rotating the upper rotating body 3.

Here, we will explain how to perform maintenance on the engine 7, etc. In this case, the engine cover 17 is opened to secure a maintenance space 22 above the engine 7. However, immediately after the engine 7 is stopped, the tail pipe 20 located near the maintenance space 22 is hot due to the heat of the exhaust gas, so work cannot be performed until the temperature of the tail pipe 20 has dropped.

However, according to this embodiment, a protective cover 21 is provided between the engine cover 17 and the aftertreatment device cover 19, covering the space between the maintenance space 22 formed when the engine cover 17 is open and the tail pipe 20 on the closed aftertreatment device cover 19. As a result, when the engine cover 17 is opened to perform work in the maintenance space 22, the protective cover 21 can prevent contact with the tail pipe 20.

As a result, workers can start maintenance immediately after engine 7 is stopped, when the temperature of tail pipe 20 is high, without having to wait for the temperature of tail pipe 20 to drop, improving work efficiency.

The protective cover 21 is also configured to include multiple fan-shaped plates that are continuous in the opening and closing direction of the engine cover 17, namely, the engine-side fan-shaped plate 24, the cover-side fan-shaped plate 25, and two intermediate fan-shaped plates 26. Therefore, when the engine cover 17 is closed, each fan-shaped plate 24, 25, 26 can be stored compactly (low). This allows the protective cover 21 to be stored inside the engine cover 17. As a result, the engine cover 17 and the aftertreatment device cover 19 can be closely attached to each other, preventing the intrusion of rainwater and dust.

In addition, when the aftertreatment device cover 19 is opened, the protective cover 21 (each of the sector plates 24, 25, 26) can be folded toward the engine cover 17. This allows a large working space to be secured even when performing maintenance on the exhaust gas aftertreatment device 8, improving workability in this respect as well.

Between the aftertreatment device cover 19 and the protective cover 21, there is a connecting mechanism using a long hole 24D that allows for misalignment between the engine cover 17 and the aftertreatment device cover 19 when they are opened and closed. In addition, between the engine cover 17 and the protective cover 21, there is a connecting mechanism 28 using a long hole 17G1 that allows for misalignment between the engine cover 17 and the aftertreatment device cover 19 when they are opened and closed. This allows the engine cover 17, aftertreatment device cover 19, and protective cover 21 (each of the sector plates 24, 25, and 26) to operate smoothly even if their rotation fulcrums are misaligned, thereby increasing the freedom of design.

Furthermore, the post-treatment device cover 19 is provided with a connecting protrusion 19E for connecting to the protective cover 21. The engine cover 17 is also provided with an engagement portion 17F that engages with the connecting protrusion 19E when the engine cover 17 is closed to restrict the movement of the post-treatment device cover 19 in the door-opening direction. Therefore, by locking the key cylinder 17H2 provided on the opening/closing mechanism 17H of the engine cover 17, the opening of the heat exchange device cover 16 can also be restricted.

In the embodiment, the protective cover 21 is described as having four sector plates 24, 25, and 26. However, the present invention is not limited to this, and the protective cover 21 may have two, three, five or more sector plates. In this case, the angle of the base of each sector plate is set to an angle different from about 20 degrees.

In the embodiment, a connecting mechanism using a long hole 24D that allows for misalignment between the engine cover 17 and the aftertreatment device cover 19 when they are opened and closed is provided between the aftertreatment device cover 19 and the protective cover 21, and a connecting mechanism 28 using a long hole 17G1 that allows for misalignment between the engine cover 17 and the aftertreatment device cover 19 when they are opened and closed is provided between the engine cover 17 and the protective cover 21. However, the present invention is not limited to this, and a connecting mechanism may be provided only between the engine cover and the protective cover or between the aftertreatment device cover and the protective cover.

In the embodiment, an example is described in which a heat exchanger cover 16, an engine cover 17, an aftertreatment device cover 19, etc. are provided on the top plate 15 of the exterior cover 12. However, the present invention is not limited to this, and for example, the heat exchanger cover may be omitted and the engine cover and aftertreatment device cover may be provided on the top plate of the exterior cover.

Furthermore, in the embodiment, a hydraulic excavator 1 equipped with a wheel-type undercarriage 2 has been described as an example. However, the present invention is not limited to this, and may be applied to a hydraulic excavator equipped with a crawler-type undercarriage. It may also be applied to other construction machines such as wheel loaders and cranes.

1. Hydraulic excavator (construction machinery)
2. Undercarriage (car body)
3. Upper rotating body (car body)
4 Working device 5 Swing frame (body frame)
[0033] 6 Counterweight 7 Engine 8 Exhaust gas aftertreatment device 12 Exterior cover 13 Left side plate 14 Right side plate 15 Top plate 15A Opening 17 Engine cover 17F Engagement portion 17G Connecting bracket (connecting mechanism)
17G1, 24D Long hole 17J, 19F Hinge (fulcrum)
19 Post-treatment device cover 19E Connection protrusion (connection mechanism)
20 tail tube 21 protective cover 22 maintenance space 24 engine side fan plate (fan plate)
25 Cover side fan plate (fan plate)
26 Intermediate sector plate 28 Connection mechanism

Claims (4)

A vehicle body frame having a support structure and a working device attached to the front side thereof;
A counterweight provided on a rear side of the vehicle body frame;
an engine that is disposed in front of the counterweight and extends in the left-right direction on the body frame in a transversely mounted state;
an exhaust gas aftertreatment device disposed on one side of the engine in a left-right direction and configured to treat exhaust gas;
an exterior cover including a left side plate, a right side plate, and a top plate having an opening for maintenance, the left side plate and the right side plate being provided on the body frame so as to cover the engine and the exhaust gas aftertreatment device;
an engine cover located above the engine, covering the opening of the top plate, and capable of being opened and closed around the counterweight side;
an aftertreatment device cover that is located above the exhaust gas aftertreatment device and is aligned with one side of the engine cover to cover the opening of the upper plate and can be opened and closed with the counterweight side as a fulcrum;
a tail pipe provided to protrude upward from the aftertreatment device cover and connected to the exhaust gas aftertreatment device;
In a construction machine comprising:
a protective cover provided between the engine cover and the aftertreatment device cover and deployed when the engine cover is opened;
The protective cover is
When the engine cover is open and the aftertreatment device cover is closed, the aftertreatment device cover is in an expanded state to cover the space between a maintenance space above the engine, which is formed when the engine cover is opened, and the tail pipe on the aftertreatment device cover;
A construction machine characterized in that , when the engine cover and the aftertreatment device cover are both open, the construction machine is folded and stored between the engine cover and the aftertreatment device cover . 2. The construction machine according to claim 1,
The protective cover is composed of a plurality of fan-shaped plates including an engine- side fan-shaped plate and an aftertreatment device-side fan-shaped plate,
Each of the plurality of fan-shaped plates is rotatable in an opening/closing direction of the engine cover with the counterweight side as a rotation fulcrum, is arranged side by side in the left-right direction, and has an arc-shaped groove formed therein with the rotation fulcrum as a center,
Adjacent sector plates among the plurality of sector plates are connected by hooks movably engaging with each other in the arc grooves,
The engine side sector plate is connected to the engine cover,
A construction machine characterized in that the aftertreatment device side fan-shaped plate is connected to the aftertreatment device cover . The construction machine according to claim 2 ,
a slot is provided in either the post-treatment device cover or the post-treatment device side fan-shaped plate;
A construction machine characterized in that the other of the aftertreatment device cover and the aftertreatment device side fan plate is provided with a connecting protrusion that connects to the long hole in a state where it can move within the long hole . The construction machine according to claim 2 ,
a coupling protrusion for coupling with the fan-shaped plate of the post-treatment device is provided on the post-treatment device cover,
a connecting protrusion provided on the engine cover for connecting the engine cover to the connecting protrusion from above when the engine cover is closed, thereby restricting movement of the aftertreatment device cover in the door-opening direction;

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