Construction machinery

Abstract

To provide a construction machine where an exchangeable internal mounted object is stored in a casing, which enables the internal mounted object to be easily installed at a desired position.SOLUTION: A construction machine 10 includes a lower traveling body 1, a turning frame 3, a counter weight 7, and a fuel tank unit 51 which is stored in a casing 20 and is detachable. The casing 20 has a body part 21 which has an opening 8 to take the fuel tank unit 51 in / and out formed on its upper surface and stores the fuel tank unit 51. The construction machine 10 includes a positioning member 70 which is positioned at a position contacting the contour of the fuel tank unit 51 at a predetermined installation position in plan view, extends in a vertical direction and has a guide part for permitting vertical sliding of the fuel tank unit 51. The positioning member 70 has an outside part 71 positioned above the body part 21.SELECTED DRAWING: Figure 8

Description

Technical Field

[0001] The present invention relates to construction machinery.

Background Art

[0002] Construction machinery such as cranes and hydraulic excavators require a large amount of power compared to automobiles, and thus are equipped with large fuel tanks, batteries, etc. that can store sufficient fuel and electricity. In addition, in preparation for the situation where supply facilities for refueling or replenishing electricity are not available at the construction site or it is difficult to arrange them, the fuel tank or battery may be configured in a cartridge type that can be replaced.

[0003] In Patent Document 1 below, a construction machine is proposed that enables power supply without installing a battery charging facility at the work site by configuring the battery to be replaceable (for example, refer to Patent Document 1 below).

[0004] In the construction machine described in Patent Document 1, the battery housing containing the used battery is lifted and removed with a crane, and the battery housing containing the fully charged battery is installed with a crane or the like, so that power can be supplied without installing a battery charging facility at the work site.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] However, in the construction machine described in Patent Document 1, the battery housing is housed in the machine room and covered by a casing along with other mounted equipment. Therefore, when installing the battery housing, the battery housing must be lowered from the crane without being able to visually confirm the installation position, which may cause the installation position to shift, and may also cause collision with the machine body or other components, resulting in damage to them.

[0007] The present invention has been made in view of these points, and its object is to enable the easy installation of replaceable mounts in a construction machine in which the mounts are housed in a casing. [Means for solving the problem]

[0008] To achieve the above objectives, construction machinery in which replaceable payloads are housed in a casing is provided with a positioning member having an outer portion located above the main body of the casing, which contacts the payload during installation to guide the payload to a predetermined installation position within the casing.

[0009] Specifically, the first invention is a construction machine comprising a lower traveling body, a slewing frame rotatably mounted on the lower traveling body, a rear mounting unit provided at the rear of the slewing frame, and a removable internal mounting unit housed in a casing provided on the front side of the rear mounting unit on the slewing frame, wherein the casing has a main body portion for housing the internal mounting unit, with an opening formed on its upper surface for loading and unloading the internal mounting unit, and a positioning member provided at a position in contact with the outer shape of the internal mounting unit at a predetermined installation position in a plan view, extending in the vertical direction and having a guide portion that allows vertical sliding of the internal mounting unit, and the positioning member has an outer portion located above the main body portion.

[0010] In the first invention, a positioning member is provided that guides the load to a predetermined installation position by contacting the load during installation. The positioning member also has a guide portion that extends vertically and allows vertical sliding of the internal load, and the guide portion is positioned to contact the outer shape of the internal load at the predetermined installation position in a plan view. Furthermore, the positioning member has an outer portion located above the main body. Therefore, by moving the internal load towards the outer portion of the positioning member, which is visible from a distance, using a crane or the like, and bringing the internal load into contact with the guide portion of the positioning member, the internal load can be easily positioned above the predetermined installation position. Then, by lowering the internal load while sliding it along the guide portion once it is in contact with the guide portion, the internal load can be easily installed at the predetermined installation position. In other words, according to the first invention, by providing a positioning member, the internal load can be easily positioned above the predetermined installation position, and the internal load can be easily installed at the desired position without colliding with the aircraft or other components and causing damage.

[0011] The second invention is characterized in that, in the first invention, at least the upper end of the outer portion is located above the upper end of the rear mounting.

[0012] In the second invention, at least the upper end of the outer portion of the positioning member is located above the upper end of the rear load, so that even when an operator of a crane or the like is at the rear of the construction machine, at least the upper end of the outer portion of the positioning member can be seen. Therefore, even if the rear load is bulky, the internal load can be easily positioned above the predetermined installation position.

[0013] The third invention is characterized in that, in the first invention, the internal mounting has a recess extending in the vertical direction, the guide portion is a convex portion extending in the vertical direction that fits into the recess of the internal mounting, and the internal mounting is guided to the predetermined installation position by lowering the internal mounting from above the opening while the convex portion is fitted into the recess of the internal mounting.

[0014] In the third invention, a recess extending in the vertical direction is formed in the internal payload, and the guiding portion of the positioning member is configured as a protrusion extending in the vertical direction that fits into the recess of the internal payload. By lowering the internal payload with the guiding portion (protrusion) fitted into the recess of the internal payload, the internal payload is guided to a predetermined installation position. With this configuration, horizontal displacement of the internal payload is restricted when it is lowered. Therefore, according to the third invention, the internal payload can be easily installed in the desired position without colliding with other parts or the aircraft body and causing damage.

[0015] The fourth invention is characterized in that, in the first invention, the internal mounting has a protrusion extending in the vertical direction, the guide portion is a recess extending in the vertical direction into which the protrusion of the internal mounting fits, and the internal mounting is guided to the predetermined installation position by lowering the internal mounting from above the opening while the protrusion of the internal mounting is fitted into the recess.

[0016] In the fourth invention, a protrusion extending in the vertical direction is formed on the internal payload, and the guiding portion of the positioning member is configured as a recess extending in the vertical direction into which the protrusion of the internal payload fits. By lowering the internal payload with the protrusion of the internal payload fitted into the guiding portion (recess), the internal payload is guided to a predetermined installation position. With this configuration, horizontal displacement of the internal payload is restricted when lowering it. Therefore, according to the fourth invention, the internal payload can be easily installed in the desired position without colliding with other parts or the aircraft body and causing damage.

[0017] The fifth invention is characterized in that, in the third invention, the lower end of the recess is configured as a lower widening portion that becomes wider from the top to the bottom.

[0018] In the fifth invention, the lower end of a recess formed in the internal load is configured as a widened lower section that widens from top to bottom. With this configuration, when aligning the internal load, which has been lifted by a crane or the like above the opening, so that the recess of the internal load corresponds to the protrusion (guide part) of the positioning member, the wider lower end of the recess allows the lower end of the recess to be fitted to the protrusion of the positioning member even if the position of the internal load is slightly misaligned in the width direction of the recess. Then, when the internal load is lowered with the protrusion of the positioning member fitted into the recess, the position of the internal load is corrected. Therefore, according to the fifth invention, the internal load can be installed more easily in the desired position.

[0019] The sixth invention is characterized in that, in the fourth invention, the upper end of the recess is configured as an upper widening portion that becomes wider from the bottom to the top.

[0020] In the sixth invention, the upper end of the recess (guiding portion) of the positioning member is configured as an upper widening portion, which widens from the bottom to the top. With this configuration, when aligning the internally mounted object so that the recess corresponds to the convex portion above the positioning member, the wider width of the upper end of the recess makes alignment easier and facilitates fitting the recess and convex portion together. Therefore, according to the sixth invention, the internally mounted object can be installed more easily in the desired position.

[0021] The seventh invention is characterized in that, in any one of the first to sixth inventions, the positioning members are provided in multiple quantities.

[0022] In the seventh invention, since a plurality of positioning members are provided, the internally mounted object can be lowered by bringing it into contact with the guiding portions of the plurality of positioning members. Therefore, when installing the internally mounted object, by rotating the internally mounted object suspended by a crane or the like within a horizontal plane and bringing it into contact with the guiding portions of the plurality of positioning members, the internally mounted object can be arranged (positioned) in a desired orientation above a predetermined installation position. Further, by lowering the internally mounted object while sliding it along the guiding portions of the plurality of positioning members, the internally mounted object can be lowered while maintaining the desired orientation. Thus, the internally mounted object can be easily installed at a desired position without colliding with other components or the airframe and causing damage.

[0023] <000008四]]The eighth invention is characterized in that, in any one of the first to sixth inventions, the positioning member has an inner portion that extends downward continuously from the lower end of the outer portion, and the guiding portion is formed so as to extend from the outer portion to the inner portion.

[0024] In the eighth invention, when installing the internally mounted object, the internally mounted object can be lowered while being in contact with the guiding portion of the positioning member not only when the internally mounted object is above the opening but also when it enters the main body portion of the casing from above the opening and reaches a predetermined installation position. That is, according to the eighth invention, the internally mounted object can be lowered without being displaced from the desired path from above the opening to a predetermined installation position inside the main body portion. Therefore, according to the eighth invention, not only when the internally mounted object is above the main body portion but also after it has entered the interior, the internally mounted object can be lowered while being in contact with the guiding portion, so that the internally mounted object can be accurately installed at a desired position without colliding with other components or the airframe and causing damage inside the main body portion of the casing.

[0025] The ninth invention is characterized in that, in any one of the first to sixth inventions, the positioning member is configured to be movable between an upper position where the outer portion is located above the main body portion and a lower position where the outer portion is not located above the main body portion.

[0026] In the ninth invention, by configuring the positioning member to be movable between an upper position and a lower position, the outer portion of the positioning member is positioned above the main body only when necessary (when installing an internal load), serving as a mark when installing the internal load. When the mark is unnecessary, the outer portion can be housed inside the main body to eliminate unnecessary protrusions. Also, when positioning the positioning member at a height position where it can be visually recognized even from a distant position, an operation to move the positioning member to the upper position suffices, and there is no need to configure the vertical length of the positioning member to be long.

[0027] The tenth invention is, in any one of the first to sixth inventions, a second positioning member extending in the vertical direction is provided at a position facing the positioning member sandwiching the opening of the main body portion, and the second positioning member is configured to have an inclined portion at least at its upper end that is inclined with respect to the vertical direction so as to be away from the opening as it goes from the lower side to the upper side.

[0028] In the tenth invention, a second positioning member configured to have an inclined portion at least at its upper end that is inclined with respect to the vertical direction so as to be away from the opening as it goes from the lower side to the upper side is provided at a position facing the positioning member sandwiching the opening of the main body portion. Therefore, even when the internal load lifted by a crane or the like is arranged closer to the second positioning member than the desired position above the opening, when the internal load is lowered, the position of the internal load is corrected toward the positioning member side by abutting against the inclined portion of the second positioning member. Thus, according to the tenth invention, the internal load can be smoothly lowered without accurately aligning the position of the internal load above the opening.

Advantages of the Invention

[0029] As described above, according to the present invention, a construction machine in which a replaceable mount is housed in a casing is provided with a positioning member having an outer portion located above the main body of the casing, which contacts the mount during the mount installation to guide the mount to a predetermined installation position within the casing. This makes it possible to provide a construction machine in which the internal mount can be easily installed in a desired position. [Brief explanation of the drawing]

[0030] [Figure 1] Figure 1 is a side view showing the overall configuration of a construction machine according to Embodiment 1. [Figure 2] Figure 2 is a perspective view showing an overview of the equipment arrangement of the upper rotating body of a construction machine according to Embodiment 1. [Figure 3] Figure 3 is a perspective view showing the machine room with the casing removed, as shown in Figure 2. [Figure 4] Figure 4 is a plan view corresponding to Figure 3. [Figure 5] Figure 5 is a drive system diagram of a construction machine according to Embodiment 1. [Figure 6] Figure 6 is an explanatory diagram showing the procedure for removing a used fuel tank unit. [Figure 7] Figure 7 is an explanatory diagram showing the procedure for installing a filled fuel tank unit. [Figure 8] Figure 8 is a magnified perspective view showing the area around the positioning member during unit installation. [Figure 9] Figure 9 is a magnified perspective view showing the area around the positioning member of the construction machine according to Embodiment 2. [Figure 10] Figure 10 is an enlarged cross-sectional view showing a positioning member of a construction machine according to a modified example 1 of Embodiment 2. [Figure 11] Figure 11 is a magnified perspective view showing the area around the positioning member of the construction machine according to Embodiment 3. [Figure 12] Figure 12 is a magnified perspective view showing the area around the positioning member of the construction machine according to Embodiment 4. [Figure 13]Figure 13 is a magnified perspective view showing the area around the positioning member of the construction machine according to Embodiment 5. [Figure 14] Figure 14 is an enlarged perspective view showing the area around the positioning member of the construction machine according to Embodiment 6. [Figure 15] Figure 15 is a side view showing the schematic configuration of a construction machine according to Embodiment 7. [Figure 16] Figure 16 is an enlarged perspective view showing the area around the second positioning member of the construction machine according to Embodiment 7. [Figure 17] Figure 17 is a longitudinal cross-sectional view showing the schematic configuration of a positioning member that is configured separately from the guard frame of a construction machine according to another embodiment. [Figure 18] Figure 18 is a diagram illustrating the operation of a vertically movable positioning member in a construction machine according to another embodiment. [Modes for carrying out the invention]

[0031] Embodiments of the present invention will be described below with reference to the drawings. The following description of preferred embodiments is essentially illustrative and is not intended to limit the present invention, its applications, or its uses.

[0032] Embodiment 1 of the Invention As shown in Figure 1, Embodiment 1 describes a hydraulic excavator as an example of the construction machine 10 according to the present invention. In the following description, as shown in Figures 1 to 4, the front-rear, left-right, and up-down directions of the construction machine 10 will be referred to as front-rear, left-right, and up-down directions, respectively.

[0033] As shown in Figure 1, the construction machine 10 comprises a crawler-type lower traveling body 1 and an upper rotating body 2 that is rotatably mounted on the lower traveling body 1.

[0034] The lower traveling body 1 has a crawler mechanism 11 having a travel hydraulic motor 11a and crawlers 11b driven by the travel hydraulic motor 11a on the left and right sides. When the travel hydraulic motors 11a of the left and right crawlers 11b are rotated in the same direction, the construction machine 10 moves forward or backward, and when the travel hydraulic motors 11a of the left and right crawlers 11b are rotated in opposite directions or when only one is rotated, the construction machine 10 rotates. The lower traveling body 1 also has a slewing bearing 12 located approximately in the upper center of the crawler mechanism 11 that supports the upper slewing body 2 so that it can rotatably move. The upper slewing body 2 rotates relative to the lower traveling body 1 when a hydraulic slewing motor 45 of a hydraulic circuit 40 (described later) receives hydraulic fluid from a hydraulic pump 41.

[0035] The hydraulic motor 11a of the lower traveling body 1 is connected to the control valve 43 of the hydraulic circuit 40, which will be described later, located in the upper rotating body 2, via hydraulic piping 14. However, to prevent the hydraulic piping 14 from twisting due to the rotation of the upper rotating body 2, it is connected via a swivel joint 13. The swivel joint 13 is located approximately in the center (center of rotation) of the rotating bearing 12.

[0036] The upper rotating body 2 comprises a rotating frame 3, an attachment 4 that is rippled and attached to the front end of the rotating frame 3 for excavating soil and other materials, a cab 5, a machine room 6, and a counterweight 7.

[0037] As shown in Figures 2 to 4, the swivel frame 3 is a platform-shaped support member that forms the bottom surface of the upper swivel body 2. A pair of vertical plates 3a, 3a are erected in the middle of the swivel frame 3 in the left-right direction. The pair of vertical plates 3a, 3a are arranged parallel to each other with a gap between them and are fixed on top of the swivel frame 3. The pair of vertical plates 3a, 3a are formed to extend from the front end to the rear end of the swivel frame 3. By providing such a pair of vertical plates 3a, 3a in the middle of the left-right direction, the rigidity of the swivel frame 3 is increased. The base end of the attachment 4 is pivotably attached to the front end of the pair of vertical plates 3a, 3a.

[0038] As shown in Figure 1, the attachment 4 comprises a boom 4a, an arm 4b, a bucket 4c, and hydraulic cylinders 4d to 4f. The base end of the boom 4a is pivotably attached to the front ends of a pair of vertical plates 3a, 3a, and swings relative to the pair of vertical plates 3a, 3a in accordance with the extension and contraction of the hydraulic cylinder 4d, which is supplied with hydraulic fluid from a hydraulic pump 41. The base end of the arm 4b is pivotably attached to the tip of the boom 4a, and swings relative to the boom 4a in accordance with the extension and contraction of the hydraulic cylinder 4e, which is supplied with hydraulic fluid from a hydraulic pump 41. The bucket 4c is pivotably attached to the tip of the arm 4b, and swings relative to the arm 4b in accordance with the extension and contraction of the hydraulic cylinder 4f, which is supplied with hydraulic fluid from a hydraulic pump 41. Note that the configuration of the attachment 4 is not limited to this.

[0039] Cab 5 is a box-shaped driver's cabin equipped with a driver's seat, various control devices, and operating devices. As shown in Figure 4, Cab 5 is positioned on the front left side of the slewing frame 3, adjacent to the left side of Attachment 4.

[0040] The machine room 6 comprises a power generation equipment room 6A and a hydraulic equipment room 6B. The power generation equipment room 6A is located at the rear of the slewing frame 3, directly in front of the counterweight 7, and has a rear section 6A1 extending from the left end to the right end, and a front section 6A2 projecting forward from the rear between the rear section and the cab 5, forming a roughly L-shape in plan view. The hydraulic equipment room 6B is located to the right of the right vertical plate 3a on the slewing frame 3, continuous with the front of the power generation equipment room 6A, and forms a roughly I-shape in plan view, extending from the middle to the front end in the front-rear direction. The power generation equipment room 6A houses the power generation equipment and the electric motor 53, while the hydraulic equipment room 6B houses hydraulic equipment such as a hydraulic pump 41 that is driven by the electric motor 53 and supplies hydraulic fluid to various hydraulic actuators 44. The power generation equipment room 6A and the hydraulic equipment room 6B are covered by a casing 20 so that the components housed within are not exposed.

[0041] [Casing] The casing 20 has a main body portion 21 with an opening 8 formed on its upper surface for inserting and removing a fuel tank unit (removable mount) 51, which will be described later, and a bonnet (lid portion) 22 provided above the main body portion 21 for opening and closing the opening 8.

[0042] (Main body) The main body 21 includes a guard frame 23, a guard cover 24, a pump cover 25, a tank cover 26, and a valve cover 27. The power generation equipment room 6A is partitioned by the guard frame 23 and the guard cover 24, and the hydraulic equipment room 6B is partitioned by the pump cover 25, the tank cover 26, and the valve cover 27.

[0043] The guard frame 23 is composed of multiple support columns 28 and multiple beams 29. The support columns 28 and beams 29 are made of L-shaped or U-shaped steel. The lower end of each support column 28 is fixed with bolts to a bracket or the like provided on the swivel frame 3. Each beam 29 is fixed with bolts to the same height position on multiple support columns 28 and assembled into a predetermined box-shaped frame structure.

[0044] The support columns 28 are erected at positions 1 through 8 on the swivel frame 3. A first support column 28a is erected at the first position, which is at the left end of the slewing frame 3 and directly behind the cab 5. A second support column 28b is erected at the second position, which is to the right of the first position and directly to the left of the left vertical plate 3a. A third support column 28c is erected at the third position, which is behind the first position. A fourth support column 28d is erected at the fourth position, which is at the right end of the slewing frame 3 and to the right of the third position. A fifth support column 28e is erected at the fifth position, which is behind the third position and directly in front of the counterweight 7. A sixth support column 28f is erected at the sixth position, which is behind the fourth position and to the right of the fifth position. A seventh support column 28g is erected at the seventh position, which is behind the second position and to the right of the third position. An eighth support column 28h is erected at the eighth position, which is approximately midway between the sixth and seventh positions. The seventh support column 28g and the eighth support column 28h are formed to be longer than the first to sixth support columns 28a to 25f and constitute the positioning member 70, which will be described later.

[0045] Multiple beams 29 are provided to connect the spaces between the first and second support columns 28, the first and third support columns 28, the second and seventh support columns 28, the third and seventh support columns 28, the seventh and eighth support columns 28, the eighth and fourth support columns 28, the third and fifth support columns 28, the fourth and sixth support columns 28, and the fifth and sixth support columns 28. Each of the multiple beams 29 connects the support columns 28 at the same height. Each beam 29 is provided at the height of the upper ends of the first to sixth support columns 28a to 25f. Therefore, the seventh support column 28g and the eighth support column 28h, which constitute the positioning member 70 described later, protrude above the upper surface of each beam 29.

[0046] The guard cover 24 is composed of multiple steel plate panels attached to the support columns 28 and beams 29 of the guard frame 23. In this embodiment 1, the guard cover 24 covers the upper surface, left and right sides, rear, and upper part of the exposed front portion (above the upper surface of the scaffolding member 30 described later) of the rear 6A1 of the power generation equipment room 6A, and the guard cover 24 covers the upper surface, left and right sides, and front of the front 6A2 of the power generation equipment room 6A. The opening 8 described above is formed on the upper surface of the guard cover 24 which constitutes the upper surface of the main body 21. Specifically, the opening 8 is formed in the panel that constitutes the upper surface of the rear 6A1 of the power generation equipment room 6A in which the fuel tank unit 51 is housed, among the panels that constitute the guard cover 24.

[0047] The panel (part of the guard cover 24) that constitutes the upper surface of the rear 6A1 of the power generation equipment room 6A, where the opening 8 is formed, is attached to the upper surfaces of the first to sixth support columns 28a to 25f and each beam 29. Therefore, the seventh support column 28g and the eighth support column 28h, which constitute the positioning member 70 described later, protrude upward from the upper surface (upper surface of the main body 21) of the panel (part of the guard cover 24) that constitutes the upper surface of the rear 6A1 of the power generation equipment room 6A where the opening 8 is formed. In other words, the seventh support column 28g and the eighth support column 28h protrude upward from the main body 21. Although the seventh support column 28g and the eighth support column 28h protrude upward from the main body 21, they are designed to fit inside the bonnet 22, that is, inside the power generation equipment room 6A (machine room), when the bonnet 22 described later is closed. Furthermore, the bonnet 22 only needs to be capable of opening and closing the opening 8, and the portions of the 7th support column 28g and the 8th support column 28h that protrude upward from the main body portion 21 (the outer portion 71 of the positioning member 70, which will be described later) do not need to be covered by the bonnet 22.

[0048] Furthermore, as described above, the opening 8 serves as the entrance and exit for the fuel tank unit (removable mounting device) 51 when replacing it. Therefore, the opening 8 is sized to allow the fuel tank unit 51 to be inserted and removed. In this embodiment 1, the opening 8 is formed in a rectangular shape, with its left-right length being longer than its front-to-back length in a plan view. In addition, the opening 8 is formed such that the seventh support column 28g and the eighth support column 28h, which will become the positioning member 70 described later, are positioned at the periphery of the opening 8 (the front edge in this embodiment 1).

[0049] Of the panels constituting the guard cover 24, the panels forming the left and right sides of the power generation equipment room 6A, which houses the fuel tank unit 51, are designed to be openable and closable. By opening either one of the panels forming the left or right side of the power generation equipment room 6A, the piping connected to the fuel tank unit 51 can be attached and detached, and the fuel tank unit 51 can be fixed or released in its installation position when the fuel tank unit 51 is replaced, as described later. In addition, by opening either one of the panels forming the left or right side of the power generation equipment room 6A, maintenance can be performed on the various power generation equipment housed inside the power generation equipment room 6A.

[0050] The power generation equipment room 6A is partitioned by the guard frame 23 and guard cover 24 configured as described above, and the power generation equipment room 6A houses a fuel tank unit (internal equipment) 51, a power generation unit 52, an electric motor 53, and a radiator 54.

[0051] The fuel tank unit 51 and the power generation unit 52 are located in the central part of the left-right direction within the power generation equipment room 6A. The power generation unit 52 is fixed on the slewing frame 3, and the fuel tank unit 51 is installed on top of the power generation unit 52 (at a predetermined installation position) and is fixed in place by fasteners (not shown) to prevent displacement. For example, an installation stand is installed in the power generation equipment room 6A, the fuel tank unit 51 is mounted on the top surface of the installation stand, and the power generation unit 52 is housed below the installation stand. The fuel tank unit 51 mounted on the top surface of the installation stand and the installation stand are fixed together by bolts or the like. Piping and the like are connected to the fuel tank unit 51 and the power generation unit 52 to guide the fuel in the fuel tank unit 51 to the power generation unit 52.

[0052] In this embodiment 1, the fuel tank unit 51 is installed such that its upper end is located above the upper surface of the main body 21. The upper end of the fuel tank unit 51 protrudes upward from the main body 21, but when the bonnet 22 is closed, it is housed inside the bonnet 22, i.e., inside the power generation equipment room 6A (machine room). In this embodiment 1, the fuel tank unit 51 is located at the very top of the casing 20, where no other components are positioned above it. The installation position of the fuel tank unit 51 is not limited to the above position, as long as the fuel tank unit 51 is housed in the casing 20. The installation position of the fuel tank unit 51 may also be such that the fuel tank unit 51 does not protrude upward from the main body 21, and the entire unit is housed inside the main body 21. Furthermore, the fuel tank unit 51 may be mounted on the slewing frame 3 without using a mounting stand.

[0053] An electric motor 53 is located to the right of the power generation unit 52 in the power generation equipment room 6A, and a radiator 54 is housed to the left. The portion of the front of the power generation equipment room 6A that is continuous with the hydraulic equipment room 6B is not covered by the guard cover 24 and is in communication with the hydraulic equipment room 6B. The electric motor 53 is connected to a hydraulic pump 41 located in the hydraulic equipment room 6B and drives the hydraulic pump 41.

[0054] The pump cover 25, tank cover 26, and valve cover 27 that partition the hydraulic equipment room 6B are composed of panels made of multiple steel plates, similar to the guard cover 24. The hydraulic equipment room 6B houses a hydraulic pump 41, a hydraulic oil tank 42, and a control valve 43. The hydraulic pump 41, hydraulic oil tank 42, and control valve 43 are installed on the slewing frame 3 in this order from rear to front. The pump cover 25, tank cover 26, and valve cover 27 are installed continuously on the slewing frame 3 in this order from rear to front.

[0055] The pump cover 25 covers the left and right sides and top of the hydraulic pump 41, the tank cover 26 covers the left and right sides and top of the hydraulic oil tank 42, and the valve cover 27 covers the left and right sides, top and front of the control valve 43. In this embodiment 1, the top surfaces of the pump cover 25 and the tank cover 26 are configured to be lower than the top surface of the panel that makes up the top surface of the rear 6A1 of the power generation equipment room 6A in which the opening 8 is formed. The top surface of the valve cover 27 is lower than the top surfaces of the pump cover 25 and the tank cover 26 and is formed in a stepped shape.

[0056] (bonnet) The bonnet 22 is a cover provided above the main body 21 that opens and closes the opening 8. The bonnet 22 is attached to the upper surface of the main body 21 via hinges (not shown) so that the opening 8 can be opened or closed. In the closed position, when the opening 8 is closed, the bonnet 22 is formed in a container shape that bulges upward. Therefore, when the bonnet 22 is in the closed position, the storage space for items in a part of the power generation equipment room 6A (the area where the fuel tank unit 51 is mounted) is expanded upward. By opening the bonnet 22 and exposing the opening 8, the fuel tank unit 51, which will be described later, can be inserted and removed, and maintenance of the various power generation equipment housed in the power generation equipment room 6A can be performed.

[0057] In this embodiment 1, the bonnet 22 opens and closes by rotating around the pivot axis of a hinge attached to its right end. Therefore, in this embodiment 1, a scaffolding member 30 is provided between a pair of vertical plates 3a, 3a and on the front side of the power generation equipment room 6A so that an operator opening and closing the bonnet 22 can stand directly in front of the bonnet 22. The scaffolding member 30 is made up of a panel of steel plate that is rectangular in plan view. The scaffolding member 30 is provided so that its upper surface is at the same height as the upper surface of the pump cover 25.

[0058] The machine room 6 is configured as described above. Of the hydraulic equipment connected to the hydraulic circuit 40, the hydraulic swing motor 45 is installed on the swing frame 3, but is located outside the hydraulic equipment room 6B. The hydraulic swing motor 45 is installed to the right rear of the swivel joint 13 between a pair of vertical plates 3a, 3a on the swing frame 3.

[0059] The counterweight 7 is located at the rear of the machine room 6 (power generation equipment room 6A). Specifically, the counterweight 7 is attached to the rear ends of a pair of vertical plates 3a, 3a of the slewing frame 3. By being attached to the rear ends of the pair of vertical plates 3a, 3a, to which the attachment 4 is attached at the front ends, the counterweight 7 balances the weight with the attachment 4.

[0060] [Drive System] As shown in Figure 5, the construction machine 10 is equipped with a hydraulic circuit 40 for operating each hydraulic actuator 44 (the hydraulic motors 11a for the left and right crawlers of the lower traveling body 1, the hydraulic swing motor 45 of the upper slewing body 2, and the hydraulic cylinders 4d to 4f of the attachment 4), and a drive device 50 for driving the hydraulic pump 41 of the hydraulic circuit 40.

[0061] The hydraulic circuit 40 is connected to a hydraulic pump 41, a hydraulic oil tank 42, a control valve 43, and each hydraulic actuator 44.

[0062] The hydraulic pump 41 is connected to a hydraulic fluid tank 42 and a control valve 43. The hydraulic pump 41 is driven by an electric motor 53, which draws hydraulic fluid from the hydraulic fluid tank 42 and discharges it toward the control valve 43. The control valve 43 distributes the hydraulic fluid discharged from the hydraulic pump 41 to each hydraulic actuator 44, thereby operating each hydraulic actuator 44. The control valve 43 controls the direction and amount of hydraulic fluid supplied to each hydraulic actuator 44, thereby causing the lower traveling body 1 to move, the upper slewing body 2 to rotate, and the boom 4a, arm 4b, and bucket 4c of the attachment 4 to operate.

[0063] In this first embodiment, the drive unit 50 is configured to drive the hydraulic pump 41 using hydrogen as a power source. Specifically, the drive unit 50 includes a fuel tank unit 51, a power generation unit 52, and an electric motor 53.

[0064] The fuel tank unit 51 includes a plurality of fuel tanks 55 and a holding member 56 that holds the plurality of fuel tanks 55. The fuel tanks 55 are substantially cylindrical hydrogen tanks filled with hydrogen gas, and in this embodiment 1, there are four of them. The holding member 56 is composed of a housing that houses the four fuel tanks 55. The holding member 56 is made of, for example, a steel plate and is configured to hold the four fuel tanks 55 inside.

[0065] The power generation unit 52 includes a fuel cell unit 57, a power converter 58, a battery 59, and a holding member 60 that holds these components. The fuel cell unit 57 is connected to the fuel tank unit 51 and the power converter 58, and generates electricity through a chemical reaction between hydrogen and oxygen supplied from the fuel tank 55, supplying the generated DC power to the power converter 58. The fuel cell unit 57 is also connected to the battery 59, and for example, surplus power during low loads is stored in the battery 59 and used during high loads. The power converter 58 is connected to the fuel cell unit 57 and the electric motor 53, and converts the DC power supplied from the fuel cell unit 57 into AC power and supplies it to the electric motor 53. The holding member 60 is a housing that houses the fuel cell unit 57, the power converter 58, and the battery 59. The holding member 60 is made of, for example, a steel plate.

[0066] The electric motor 53 is electrically connected to the power converter 58 and is also connected to the rotating shaft of the hydraulic pump 41 to rotationally drive the hydraulic pump 41. The electric motor 53 is driven by the alternating current supplied from the power converter 58 and rotationally drives the hydraulic pump 41. The rotational drive of the hydraulic pump 41 supplies hydraulic fluid from the hydraulic circuit 40 to each hydraulic actuator, causing the lower traveling body 1 to travel, the upper slewing body 2 to rotate, or the boom 4a, arm 4b, and bucket 4c of the attachment 4 to operate.

[0067] [Positioning member] In the construction machine 10, the fuel tank unit 51 is fixed to the power generation unit 52 in the power generation equipment room 6A (at a predetermined installation position) with a fixing device that can be released, thereby being detachably installed at a predetermined installation position. In the construction machine 10, by mounting the fuel tank unit 51 in this detachable manner, fuel can be replenished by exchanging the used fuel tank unit 51 for a fuel-filled fuel tank unit 51. With this configuration, the time required to refuel the construction machine 10 can be shortened compared to when the construction machine 10 is equipped with four fuel tanks 55 and each fuel tank 55 is refueled separately.

[0068] By the way, the fuel tank unit (internal components) 51, which contains multiple fuel tanks 55, is large, so a crane 61 is used for removal and installation. Since the fuel tank unit 51 is housed in the casing 20 of the machine room 6 (in this embodiment 1, the power generation equipment room 6A), which is not visible from the outside of the construction machine 10, the operator of the crane 61 cannot see the installation position of the fuel tank unit (internal components) 51 during installation, making it difficult to align the fuel tank unit (internal components) 51.

[0069] Therefore, in this embodiment 1, when installing the unit (installing the installed equipment) by opening the bonnet (lid) 22 of the casing 20 of the power generation equipment room (machine room) 6A and lowering the fuel tank unit (internal equipment) 51 from above the opening 8 into the main body 21 of the casing 20, a positioning member 70 is provided as a marker so that the fuel tank unit 51 can be easily installed in a predetermined position. The positioning member 70 has a guide portion that guides the fuel tank unit 51 to a predetermined installation position by allowing vertical sliding of the fuel tank unit 51 while in contact with the fuel tank unit 51 during unit installation. Furthermore, the positioning member 70 is configured to have an outer portion 71 located above the upper surface of the main body 21.

[0070] Specifically, in this embodiment 1, the two vertically extending support columns (the seventh support column 28g and the eighth support column 28h) that constitute the guard frame 23 of the main body 21 become the positioning members 70. In this embodiment 1, the seventh support column 28g and the eighth support column 28h are provided on the front edge of the opening 8, and their rear surfaces, which are formed as smooth surfaces without irregularities, are positioned to contact the front surface (outer shape) of the fuel tank unit 51 at a predetermined installation position in a plan view. The rear surfaces of the seventh support column 28g and the eighth support column 28h are provided to contact the outer shape of the fuel tank unit 51 at a predetermined installation position in a plan view, extend vertically, and constitute a guide portion that allows vertical sliding of the fuel tank unit 51.

[0071] In this embodiment 1, the fuel tank unit 51 is installed in a front-to-back position where its front surface overlaps with the front edge of the opening 8 in a plan view. Therefore, the seventh support column 28g and the eighth support column 28h do not protrude into the opening 8. However, if the fuel tank unit 51 is installed in a position behind the front edge of the opening 8, the seventh support column 28g and the eighth support column 28h may be provided to protrude into the opening 8. By arranging the seventh support column 28g and the eighth support column 28h (positioning member 70) in this manner, the guiding portion of the positioning member 70 (the rear surfaces of the seventh support column 28g and the eighth support column 28h) is positioned in a plan view to be in contact with the outer shape (front surface) of the fuel tank unit 51 at its predetermined installation position.

[0072] Furthermore, the seventh support column 28g and the eighth support column 28h protrude above the panel that constitutes the upper surface of the main body 21 (the upper surface of the guard cover 24). In other words, the seventh support column 28g and the eighth support column 28h, which constitute the positioning member 70, have an outer portion 71 that protrudes above the upper surface of the main body 21. The seventh support column 28g and the eighth support column 28h, which constitute the positioning member 70, are formed to a length (height of the upper end) that allows the operator of the crane 61 to see the outer portion 71 when the unit is installed. In addition, the seventh support column 28g and the eighth support column 28h, which constitute the positioning member 70, are provided such that at least the upper end of the outer portion 71 is located above the upper end of the counterweight (rear load) 7.

[0073] With this configuration, when installing the unit, the fuel tank unit 51 is moved by the crane 61 toward the outer portion 71 of the positioning member 70 (seventh column 28g and eighth column 28h), which can be seen from a distance, and the front of the fuel tank unit 51 (the front of the holding member 56, which is made up of a housing) is brought into contact with the rear surface (guide part) of the positioning member 70. This allows the fuel tank unit 51 to be easily and accurately positioned (positioned) above the opening 8 at a position above the predetermined installation position (a position where the fuel tank unit 51 can be mounted at the predetermined installation position simply by lowering it). Furthermore, for example, if the seventh column 28g and the eighth column 28h are installed at positions equidistant from the midpoint of the opening 8 in the left-right direction, the midpoint of the opening 8 in the left-right direction can be recognized from the outer portion 71 of the two positioning members 70 (seventh column 28g and eighth column 28h), so the fuel tank unit 51 can be accurately positioned above the predetermined installation position in the left-right direction as well.

[0074] Then, by sliding the front surface of the fuel tank unit 51 against the rear surface (guide portion) of the positioning member 70 while lowering the fuel tank unit 51, the fuel tank unit 51 is guided to a predetermined installation position.

[0075] Furthermore, in this embodiment 1, the seventh support column 28g and the eighth support column 28h extend downward from a position above the upper surface of the main body 21 to the upper surface of the slewing frame 3. As a result, the rear surfaces (guiding portions of the positioning member 70) of the seventh support column 28g and the eighth support column 28h, which are formed as smooth surfaces without irregularities, also extend from a position above the upper surface of the main body 21 to the upper surface of the slewing frame 3. Therefore, when the unit is installed, if the front surface of the fuel tank unit 51 is slid down against the rear surface (guiding portion) of the outer portion 71 of the positioning member 70, the rear surface (guiding portion) of the positioning member 70 also slides against the front surface of the fuel tank unit 51 inside the main body 21, guiding the fuel tank unit 51 to the predetermined installation position without misalignment. In other words, in this embodiment 1, the seventh support column 28g and the eighth support column 28h, which serve as the positioning member 70, extend downward in a continuous manner from the lower end of the outer portion 71 and have an inner portion 79 that contacts the fuel tank unit 51 at a predetermined installation position inside the main body 21. Therefore, even when a low-height fuel tank unit 51 is mounted such that its upper end is located below the upper surface of the main body 21 when the fuel tank unit 51 is installed on the upper surface of the mounting base, the fuel tank unit 51 can be guided to the predetermined installation position by sliding the fuel tank unit 51 against the rear surfaces of the seventh support column 28g and the eighth support column 28h (the guide portion of the positioning member 70), even if the upper end of the fuel tank unit 51 has entered the main body 21 through the opening 8.

[0076] Furthermore, if the fuel tank unit 51 abuts against the front inner wall surface of the main body 21 at a predetermined installation position, the inner portion 79 may be formed by the front inner wall surface of the main body 21.

[0077] [How to replace the fuel tank unit] Next, the method for replacing the fuel tank unit 51 will be explained with reference to Figures 6 and 7. Figure 6 shows the procedure for removing the used fuel tank unit 51a (removal method), and Figure 7 shows the procedure for installing the filled fuel tank unit 51b (installation method).

[0078] (How to remove) First, as shown in Figure 6(a), the panels (part of the guard cover 24) that make up the left and right sides of the power generation equipment room 6A are opened, the piping connected to the used fuel tank unit 51a is removed, and the used fuel tank unit 51a is released from its position by operating the fasteners that secure the used fuel tank unit 51a in place.

[0079] Next, as shown in Figure 6(b), the crane truck 60 loaded with the filled fuel tank unit 51b is brought closer to the construction machine 10, and the hood 22 is opened to expose the opening 8. Then, the used fuel tank unit 51a is attached to the hook of the crane 61 in a rigging operation.

[0080] Once the rigging work is complete, as shown in Figure 6(c), the used fuel tank unit 51a is lifted straight up by operating the crane 61 and removed from the machine room 6 through the opening 8. Then, the crane 61 is rotated to move the used fuel tank unit 51a onto the loading platform of the crane truck 60, and after lowering it onto the loading platform, the rigging work is performed to remove the used fuel tank unit 51a from the hook of the crane 61.

[0081] By following the above procedure, the used fuel tank unit 51a is removed.

[0082] (Installation method) First, a lifting operation is performed to attach the filled fuel tank unit 51b, which is loaded onto the bed of the crane truck 60, to the hook of the crane 61. Once the lifting operation is complete, as shown in Figure 7(a), the crane 61 lifts the filled fuel tank unit 51b and rotates the crane 61 to move the filled fuel tank unit 51b directly above the opening 8. At this time, as shown in Figure 9, using the outer portion 71 located above the upper surface of the main body 21 of the positioning member 70 (seventh support column 28g and eighth support column 28h) as a guide, the front surface of the holding member 56, which is the housing of the filled fuel tank unit 51b, is aligned so that it contacts the rear surface (guide portion) of the positioning member 70, and the filled fuel tank unit 51b is positioned above the predetermined installation position. Then, the filled fuel tank unit 51b is lowered while its front surface slides against the rear surface (guide portion) of the positioning member 70. As a result, the filled fuel tank unit 51b descends along the positioning member 70 and is guided to a predetermined installation position.

[0083] After placing the filled fuel tank unit 51b in the designated installation position, a lifting operation is performed to remove the filled fuel tank unit 51b from the hook of the crane 61, as shown in Figure 7(a). Once the lifting operation is complete, the filled fuel tank unit 51b is fixed in place by operating the fasteners, as shown in Figure 7(c), and piping is connected to the filled fuel tank unit 51b to connect it to the power generation unit 52 (fuel cell unit 57).

[0084] By following the above procedure, the filled fuel tank unit 51b is installed (mounted).

[0085] -Effects of Embodiment 1- In the construction machine 10 of this embodiment 1, when the unit is installed (when the installed object is installed) by opening the bonnet 22 of the casing 20 and lowering the fuel tank unit 51 (internal installed object) from above the opening 8 into the main body 21, a positioning member 70 is provided that contacts the fuel tank unit 51 to guide it to a predetermined installation position. The positioning member 70 has a guide portion (rear surface) that extends in the vertical direction and allows vertical sliding of the fuel tank unit 51, and the guide portion (rear surface) is provided at a position that contacts the outer shape of the fuel tank unit 51 when it is in a predetermined installation position in a plan view. Furthermore, the positioning member 70 has an outer portion 71 that is located above the main body 21 when the unit is installed. Therefore, by moving the fuel tank unit 51 with the crane 61 toward the outer portion 71 of the positioning member 70, which can be seen from a distance, and bringing the fuel tank unit 51 into contact with the guide portion (rear surface) of the positioning member 70, the fuel tank unit 51 can be easily positioned above the predetermined installation position. Then, by lowering the fuel tank unit 51 while sliding it against the guide portion (rear surface) of the positioning member 70 at the position where it is in contact with the guide portion (rear surface) of the positioning member 70, the fuel tank unit 51 can be easily installed at the predetermined installation position. In other words, according to this embodiment 1, by providing the positioning member 70, the fuel tank unit 51 can be easily positioned above the predetermined installation position, and the fuel tank unit 51 can be easily installed at the desired position without colliding with the aircraft or other components and causing damage.

[0086] Furthermore, in the construction machine 10 of this embodiment 1, at least the upper end of the outer portion 71 of the positioning member 70 is located above the upper end of the counterweight (rear mount) 7. Therefore, even when the operator of the crane 61 is at the rear of the construction machine 10, at least the upper end of the outer portion 71 of the positioning member 70 can be seen. Accordingly, even if the counterweight 7 is bulky, the fuel tank unit 51 can be easily positioned above the predetermined installation position.

[0087] Furthermore, in the construction machine 10 of this embodiment 1, the fuel tank unit 51 has only an openable and closable bonnet 22 positioned above it within the casing 20, so it does not need to remove other components when replacing it, making it easy to replace.

[0088] Furthermore, in the construction machine 10 of this embodiment 1, since two (or more) positioning members 70 are provided, the fuel tank unit 51 can be lowered by bringing it into contact with the rear surfaces (guide parts) of the two positioning members 70. Therefore, when installing the unit, the fuel tank unit 51 suspended by the crane 61 can be rotated in the horizontal plane so that its front surface comes into contact with the rear surfaces (guide parts) of the two positioning members 70, thereby positioning the fuel tank unit 51 in the desired orientation above the predetermined installation position. In addition, by lowering the fuel tank unit 51 while sliding its front surface against the rear surfaces (guide parts) of the two positioning members 70, the fuel tank unit 51 can be lowered while maintaining the desired orientation, so the fuel tank unit 51 can be easily installed in the desired position without colliding with other parts or the machine body and causing damage.

[0089] Furthermore, in the construction machine 10 of this embodiment 1, the positioning member 70 is configured to have an inner portion 79 that extends downward in a continuous manner from the lower end of the outer portion 71, and the rear surface (guiding portion) of the positioning member 70 is formed to be a smooth surface without irregularities from the outer portion 71 to the inner portion 79. Therefore, when installing the unit, the fuel tank unit 51 can be lowered while remaining in contact with the rear surface (guiding portion) of the positioning member 70, not only when the fuel tank unit 51 is above the opening, but also when it enters the main body portion 21 of the casing 20 from above the opening 8 and reaches a predetermined installation position. In other words, according to the construction machine 10 of this embodiment 1, regardless of the height of the fuel tank unit 51, the fuel tank unit 51 can be lowered along a desired path without displacement from above the opening 8 to a predetermined installation position inside the main body portion 21. Therefore, according to the construction machine 10 of this embodiment 1, the fuel tank unit 51 can be lowered while remaining in contact with the rear surface (guide part) of the positioning member 70, not only when the fuel tank unit 51 is above the main body 21, but also after it has entered the interior. As a result, the fuel tank unit 51 can be accurately installed in the desired position within the main body 21 of the casing 20 without colliding with other parts or the machine body and causing damage.

[0090] Embodiment 2 of the Invention Embodiment 2 modifies some of the components of the construction machine 10 in Embodiment 1 so that the positioning member 70 and the fuel tank unit 51 are fitted together.

[0091] Specifically, as shown in Figure 9, in Embodiment 2, the fuel tank unit (internal components) 51 has vertically extending recesses 72 into which the protrusions of the positioning member 70 (the entirety of the seventh column 28g and the eighth column 28h in Figure 9) slide freely. Specifically, two recesses 72 are formed on the front surface of the box-shaped retaining member 56 of the fuel tank unit 51 by forming two grooves on the front surface of the retaining member 56. The recesses 72 are formed in a U-shape in cross-section so that at least the rear ends (the entirety in Figure 9) of the seventh column 28g and the eighth column 28h, which have a rectangular cross-section, slide freely. In Embodiment 2, the recesses 72 are formed as grooves extending from the upper end to the lower end of the retaining member 56.

[0092] The recess 72 may be integrally formed with the retaining member 56, or it may be formed separately and fixed to the front surface of the retaining member 56. Furthermore, if it is formed separately and fixed to the front surface of the retaining member 56, the recess 72 does not need to be formed to extend from the upper end to the lower end of the retaining member 56, but only needs to be provided in a length and position that allows the protrusion of the positioning member 70 to fit until the fuel tank unit 51 reaches the predetermined installation position.

[0093] On the other hand, in Embodiment 2, the seventh column 28g and the eighth column 28h, which constitute the positioning member 70, are fixed to the rear surface of the beam 29 that connects the upper ends of the third and fourth columns 28c and 28d, and are positioned within the opening 8 in a plan view. At least the rear ends (the entire portion in Figure 9) of the seventh column 28g and the eighth column 28h, positioned within the opening 8, constitute vertically extending protrusions that slidably fit into the recess 72 of the fuel tank unit 51, and are positioned to fit into (contact the outer shape of) the recess 72 of the fuel tank unit 51 at a predetermined installation position in a plan view. In Embodiment 2, the protrusions of this positioning member 70 (the entire seventh column 28g and the eighth column 28h in Figure 9) act as guides that lead the fuel tank unit 51 to a predetermined installation position within the main body 21 by allowing vertical sliding of the fuel tank unit 51 while it is fitted (contacting) the recess 72 of the fuel tank unit 51 during unit installation. Furthermore, the rear ends of the seventh support column 28g and the eighth support column 28h may be configured to fit into the recess 72 of the fuel tank unit 51 (becoming the protrusions of the positioning member 70).

[0094] With the above configuration, as shown in Figure 8, when installing the unit, the fuel tank unit 51 is moved by the crane 61 toward the outer portion 71 of the positioning member 70, which can be seen from a distance, and positioned above the opening 8 such that the protrusions of the two positioning members 70 (the entirety of the 7th support column 28g and the 8th support column 28h in Figure 9) fit into the respective recesses 72. By fitting the protrusions of the positioning members 70 into the recesses 72 in this way, the positioning of the fuel tank unit 51 in the front-rear direction and the left-right direction can be easily performed above the opening 8. In other words, the fuel tank unit 51 can be easily positioned above the predetermined installation position above the opening 8. Then, when the fuel tank unit 51 is lowered, it is guided to the predetermined installation position without shifting forward or to the left or right.

[0095] Specifically, the groove bottom surface (front surface) of the recess 72 abuts against the rear surface of the protrusion of the positioning member 70, thereby suppressing forward displacement of the fuel tank unit 51. In addition, the right inner surface and left inner surface of the recess 72 abut against the left and right sides of the protrusion of the positioning member 70, respectively, thereby suppressing lateral displacement of the fuel tank unit 51 to the left and right, respectively. Therefore, according to the construction machine 10 of Embodiment 2, when lowering the fuel tank unit 51, the horizontal displacement of the fuel tank unit 51 can be restricted, so that the fuel tank unit 51 can be easily installed in the desired position without colliding with other parts or the machine body and causing damage.

[0096] -Modification 1 of Embodiment 2- Modification 1 is a modification of the construction machine 10 of Embodiment 2, in which the cross-sectional shape of the protrusion of the positioning member 70 and the recess 72 into which the protrusion is fitted are changed.

[0097] Specifically, as shown in Figure 10, the protrusions of the positioning member 70 (the entirety of the 7th support column 28g and the 8th support column 28h in Figure 10) are formed in a trapezoidal shape, where the cross-sectional outer shape narrows from the front to the rear. On the other hand, the recesses 72 are formed in a trapezoidal shape, where the cross-sectional shape (trapezoidal shape) of the protrusions of the positioning member 70 narrows towards the bottom of the groove into which they fit. By forming the protrusions and recesses 72 in this way, it becomes easier to fit the protrusions into the recesses 72.

[0098] Furthermore, in the modified example 1, the protrusion of the positioning member 70 is provided with a cover member 73 that covers the surface (rear surface and left and right sides) facing the inner surface of the recess 72. The cover member 73 is made of a resin or the like that can improve the sliding surface of the protrusion and the recess 72. By providing the cover member 73 on the protrusion in this way, it is possible to suppress scratches on the protrusion when it comes into contact with the inner surface of the recess 72. In addition, by improving the sliding surface when the protrusion and the recess 72 slide against each other, wear on the sliding surface can be suppressed.

[0099] Furthermore, the cross-sectional shapes of the convex and concave portions 72 of the positioning member 70 are not limited to U-shapes (with the convex portion being rectangular) or trapezoidal shapes. Other shapes are also acceptable, such as U-shapes or V-shapes, as long as the fit between the convex portion and the concave portion 72 restricts forward and lateral displacement when the fuel tank unit 51 is lowered.

[0100] Embodiment 3 of the Invention Embodiment 3 modifies some of the components of the construction machine 10 in Embodiment 1 so that the positioning member 70 and the fuel tank unit 51 are fitted together.

[0101] Specifically, as shown in Figure 11, in Embodiment 3, the fuel tank unit (internal components) 51 has vertically extending protrusions 74 that slidably fit into the recesses of the positioning member 70 (the entirety of the seventh support column 28g and the eighth support column 28h in Figure 11). Specifically, the protrusions 74 project forward from the front surface of the box-shaped holding member 56 of the fuel tank unit 51 and extend from the lower end to the upper end of the holding member 56. In Embodiment 3, two protrusions 74 are formed at positions corresponding to the seventh support column 28g and the eighth support column 28h.

[0102] The protrusion 74 may be integrally formed with the retaining member 56, or it may be formed separately and fixed to the front surface of the retaining member 56. Furthermore, if it is formed separately and fixed to the front surface of the retaining member 56, the protrusion 74 does not need to be formed to extend from the upper end to the lower end of the retaining member 56, but only needs to be provided with a length and position that allows the fuel tank unit 51 to fit into the recess of the positioning member 70 until it reaches the predetermined installation position.

[0103] On the other hand, in Embodiment 3, the seventh column 28g and the eighth column 28h, which constitute the positioning member 70, are fixed to the rear surface of the beam 29 that connects the upper ends of the third and fourth columns 28c and 28d, similar to Embodiment 2, and are positioned within the opening 8 in a plan view. In Embodiment 3, the seventh column 28g and the eighth column 28h are made of steel material with a U-shaped cross-section into which the protrusion 74 of the fuel tank unit 51 can be slidably fitted. They are fixed to the beam 29 in an orientation that opens towards the rear so that the protrusion 74 of the fuel tank unit 51 can be fitted, and constitute a recess of the positioning member 70 that extends in the vertical direction into which the protrusion 74 of the fuel tank unit 51 can be slidably fitted. The recess of the positioning member 70 (the entirety of the seventh column 28g and the eighth column 28h in Figure 11), which is positioned within the opening 8 in this way, is provided in a position in a plan view where the protrusion 74 of the fuel tank unit 51, which is in a predetermined installation position, fits (contacts the outer shape). In Embodiment 3, the recess of the positioning member 70 acts as a guide, guiding the fuel tank unit 51 to a predetermined installation position within the main body 21 by allowing vertical sliding of the fuel tank unit 51 while the protrusion 74 of the fuel tank unit 51 is fitted (contacting) into it during unit installation. Alternatively, only the rear ends of the seventh support column 28g and the eighth support column 28h may constitute the recess of the positioning member 70 into which the protrusion 74 of the fuel tank unit 51 fits.

[0104] With the above configuration, as shown in Figure 11, when installing the unit, the fuel tank unit 51 is moved by the crane 61 toward the outer portion 71 of the positioning member 70, which can be seen from a distance, and positioned above the opening 8 such that the two protrusions 74 fit into the two recesses formed by the two positioning members 70. By fitting the protrusions 74 of the fuel tank unit 51 into the recesses of the positioning member 70 in this way, the front-to-back and left-to-right positioning of the fuel tank unit 51 can be easily performed above the opening 8. In other words, the fuel tank unit 51 can be easily positioned above the predetermined installation position above the opening 8. Then, when the fuel tank unit 51 is lowered, the fuel tank unit 51 is guided to the predetermined installation position without any displacement forward or to the left or right.

[0105] Specifically, the bottom surface of the groove of the recess abuts against the front surface of the protrusion 74 of the fuel tank unit 51, thereby suppressing the forward displacement of the fuel tank unit 51. In addition, the right inner surface and left inner surface of the recess abut against the left and right sides of the protrusion 74, respectively, thereby suppressing the left-right displacement of the fuel tank unit 51. Therefore, according to the construction machine 10 of Embodiment 3, when lowering the fuel tank unit 51, the horizontal displacement of the fuel tank unit 51 can be restricted, allowing the fuel tank unit 51 to be easily installed in the desired position without colliding with other parts or the machine body and causing damage.

[0106] In Embodiment 3, as with Modification 1 of Embodiment 2, the cross-sectional shape of the recess of the positioning member 70 and the protrusion 74 that fits into the recess can be changed, and the shape may be any other shape as long as it restricts forward and left / right lateral displacement when the fuel tank unit 51 is lowered.

[0107] Furthermore, in Embodiment 3, similar to Modification 1 of Embodiment 2, a cover member may be provided on the protrusion 74 to cover the surface (front and left and right sides) that faces the inner surface of the recess of the positioning member 70 (the entirety of the 7th support column 28g and the 8th support column 28h in Figure 11). By providing a cover member, it is possible to suppress scratches on the protrusion 74 when it comes into contact with the inner surface of the recess, and it is also possible to suppress wear on the sliding surface by improving sliding when the protrusion 74 and the recess slide against each other.

[0108] Embodiment 4 of the Invention Embodiment 4 is a modified version of Embodiment 2's construction machine 10, with some changes to the configuration of the recess 72.

[0109] Specifically, as shown in Figure 12, in Embodiment 4, the lower end of the recess 72 is configured as a lower widening portion 75, where the width from left to right increases from the top to the bottom. In the lower widening portion 75, the distance between the left and right inner surfaces increases from the top to the bottom.

[0110] With this configuration, according to the construction machine 10 of Embodiment 4, when aligning the fuel tank unit 51, which has been lifted by the crane 61 above the opening 8, so that its recess 72 corresponds to the protrusions of the positioning member 70 (the 7th support column 28g and the 8th support column 28h), the width of the lower end of the recess 72 is wide enough that even if the position of the fuel tank unit 51 is slightly misaligned in the left-right direction, the lower end of the recess 72 can be fitted into the protrusions of the positioning member 70. Then, when the fuel tank unit 51 is lowered with the protrusions of the positioning member 70 fitted into the recess 72, the position of the fuel tank unit 51 in the left-right direction is corrected. Therefore, according to the construction machine 10 of Embodiment 4, the fuel tank unit 51 can be installed more easily in the desired position.

[0111] In this embodiment 4, the recess 72 may be integrally formed with the retaining member 56, or it may be formed separately and fixed to the front surface of the retaining member 56. Furthermore, if it is formed separately and fixed to the front surface of the retaining member 56, the recess 72 does not need to be formed to extend from the upper end to the lower end of the retaining member 56, but should be provided in a length and position that allows the protrusion of the positioning member 70 to fit until the fuel tank unit 51 reaches the predetermined installation position.

[0112] Furthermore, in this fourth embodiment, only the rear ends of the seventh support column 28g and the eighth support column 28h may be configured to fit into the recess 72 of the fuel tank unit 51 (becoming the protrusion of the positioning member 70).

[0113] Furthermore, in Embodiment 4, as with Modification 1 of Embodiment 2, the cross-sectional shape of the positioning member 70 which forms the convex portion and the recess 72 into which the convex portion is fitted can be changed, and the shape may be any other shape as long as it restricts the positional displacement in the forward and left and right directions when the fuel tank unit 51 is lowered.

[0114] Furthermore, in Embodiment 4, similar to Modification 1 of Embodiment 2, a cover member 73 may be provided on the protruding portion of the positioning member 70 to cover the surface (front and left and right sides) facing the inner surface of the recess 72. By providing the cover member 73, it is possible to suppress scratches on the protruding portion of the positioning member 70 when it comes into contact with the inner surface of the recess 72, and also to suppress wear on the sliding surface by improving sliding when the protruding portion of the positioning member 70 and the recess 72 slide against each other.

[0115] Embodiment 5 of the Invention Embodiment 5 is a modified version of Embodiment 4's construction machine 10, with some changes made to the configuration of the protrusions of the positioning member 70.

[0116] Specifically, as shown in Figure 13, in Embodiment 5, the protrusion of the positioning member 70 (the entirety of the 7th support column 28g and the 8th support column 28h in Figure 13) has a protrusion widening portion 76 that engages with the lower widening portion 75 of the recess 72. The protrusion widening portion 76 is formed so that its width increases from top to bottom. The protrusion widening portion 76 is provided at a height position where, when the fuel tank unit 51 is lowered from above the opening 8 to a predetermined installation position with the protrusion fitted into the recess 72, there is no gap between the outer surface (left and right sides) and the inner surface (left and right inner sides) of the lower widening portion 75 of the recess 72. In Embodiment 5, the protrusion widening portion 76 is provided at the above height position by forming the protrusion widening portion 76 on approximately the lower half of the protrusion of the positioning member 70.

[0117] The means for providing the convex widening portion 76 at the above height position are not limited to the means described above. For example, the convex widening portion 76 may be formed only in the middle of the convex portion of the positioning member 70 in the vertical direction, and only in the portion that faces the lower widening portion 75 of the recess 72 when the fuel tank unit 51 is in the installation position.

[0118] With this configuration, according to the construction machine 10 of Embodiment 5, similar to Embodiment 4, when aligning the fuel tank unit 51, which has been lifted by the crane 61 above the opening 8, so that the recess 72 of the fuel tank unit 51 corresponds to the protrusion of the positioning member 70, the width of the left and right sides of the lower end of the recess 72 is wide, so even if the left-right position of the fuel tank unit 51 is slightly off, the lower end of the recess 72 can be fitted into the protrusion of the positioning member 70. Then, when the fuel tank unit 51 is lowered with the protrusion of the positioning member 70 fitted into the recess 72, the left-right position of the fuel tank unit 51 is corrected. Therefore, according to the construction machine 10 of Embodiment 5, the fuel tank unit 51 can be installed more easily in the desired position.

[0119] In this embodiment 5, the recess 72 may be integrally formed with the retaining member 56, or it may be formed separately and fixed to the front surface of the retaining member 56. Furthermore, if it is formed separately and fixed to the front surface of the retaining member 56, the recess 72 does not need to be formed to extend from the upper end to the lower end of the retaining member 56, but should be provided in a length and position such that the protrusion of the positioning member 70 fits into it until the fuel tank unit 51 reaches the predetermined installation position.

[0120] Furthermore, in this embodiment 5, the rear ends of the seventh support column 28g and the eighth support column 28h may be configured to fit into the recess 72 of the fuel tank unit 51 (becoming the protrusion of the positioning member 70).

[0121] Furthermore, in Embodiment 5, as with Modification 1 of Embodiment 2, the cross-sectional shape of the positioning member 70 which forms the convex portion and the recess 72 into which the convex portion is fitted can be changed, and the shape may be any other shape as long as it restricts the positional displacement in the forward and left and right directions when the fuel tank unit 51 is lowered.

[0122] Furthermore, in Embodiment 5, similar to Modification 1 of Embodiment 2, a cover member 73 may be provided on the protruding portion of the positioning member 70 to cover the surface (front and left and right sides) that faces the inner surface of the recess 72. By providing the cover member 73, it is possible to suppress scratches on the protruding portion of the positioning member 70 when it faces the inner surface of the recess 72, and also to suppress wear on the sliding surface by improving sliding when the protruding portion of the positioning member 70 and the recess 72 slide against each other.

[0123] Embodiment 6 of the Invention Embodiment 6 is a modified version of Embodiment 3's construction machine 10, with some changes made to the configuration of the recess and protrusion 74 of the positioning member 70.

[0124] Specifically, as shown in Figure 14, in Embodiment 6, the upper end of the recess of the positioning member 70 (the entirety of the 7th support column 28g and the 8th support column 28h in Figure 14) is configured as an upper widening portion 77, where the width from left to right increases from the bottom to the top. In the upper widening portion 77, the distance between the left and right inner surfaces increases from the bottom to the top.

[0125] Furthermore, in Embodiment 6, the protrusion 74 has a protrusion widening portion 78 that engages with the upper widening portion 77 of the recess of the positioning member 70. The protrusion widening portion 78 is formed such that its width increases from bottom to top. When the fuel tank unit 51 is lowered from above the opening 8 to a predetermined installation position with the protrusion 74 fitted into the recess of the positioning member 70, the protrusion widening portion 78 is positioned at a height where the gap between the inner surfaces (left and right inner surfaces) of the upper widening portion 77 of the recess of the positioning member 70 disappears on the outer surface (left and right sides).

[0126] With the above configuration, according to the construction machine 10 of Embodiment 6, when aligning the fuel tank unit 51 so that the protrusion 74 of the fuel tank unit 51, which has been lifted by the crane 61 above the opening 8, corresponds to the recess of the positioning member 70, the left and right width of the upper end of the recess of the positioning member 70 is wide. Therefore, even if the left-right position of the fuel tank unit 51 is slightly off, the lower end of the protrusion 74 can be fitted into the recess of the positioning member 70. Then, when the fuel tank unit 51 is lowered with the protrusion 74 fitted into the recess of the positioning member 70, the left-right position of the fuel tank unit 51 is corrected. Accordingly, according to the construction machine 10 of Embodiment 6, the fuel tank unit 51 can be installed more easily in the desired position.

[0127] In this embodiment 6, the protrusion 74 may be integrally formed with the retaining member 56, or it may be formed separately and fixed to the front surface of the retaining member 56. Furthermore, if it is formed separately and fixed to the front surface of the retaining member 56, the protrusion 74 does not need to be formed to extend from the upper end to the lower end of the retaining member 56, but only needs to be provided with a length and position that allows the fuel tank unit 51 to fit into the recess of the positioning member 70 until it reaches a predetermined installation position.

[0128] Furthermore, in this embodiment 6, only the rear ends of the seventh support column 28g and the eighth support column 28h may constitute the recess of the positioning member 70 into which the protrusion 74 of the fuel tank unit 51 fits.

[0129] Furthermore, in this embodiment 6, as with modification 1 of embodiment 2, the cross-sectional shape of the positioning member 70 which forms a recess and the protrusion 74 which fits into the recess can be changed, and the shape may be any other shape as long as it restricts the positional displacement in the forward and left and right directions when the fuel tank unit 51 is lowered.

[0130] Furthermore, in Embodiment 6, similar to Modification 1 of Embodiment 2, a cover member may be provided on the protrusion 74 to cover the surface (front and left and right sides) that faces the inner surface of the recess of the positioning member 70. By providing a cover member, it is possible to suppress scratches on the protrusion 74 when it comes into contact with the inner surface of the recess, and it is also possible to suppress wear on the sliding surface by improving the sliding when the protrusion 74 and the recess slide against each other.

[0131] In the embodiment 6, the positioning member 70 may be configured such that only the recess has an upper widening portion 77, and the protrusion 74 does not have a protrusion widening portion 78.

[0132] Embodiment 7 of the Invention Embodiment 7 is the construction machine 10 of Embodiment 1 with the addition of a second positioning member 80.

[0133] Specifically, as shown in Figures 15 and 16, the second positioning member 80 is provided at a position opposite to the positioning member 70, which straddles the opening 8 of the main body 21. Specifically, the second positioning member 80 is provided on the peripheral edge of the opening 8 of the main body 21, on the rear edge (opposite side) opposite to the front edge (one side) where the positioning member 70 is provided. The second positioning member 80 is a plate-shaped member extending upward from the upper end of the main body 21, and is made of, for example, a steel plate. The second positioning member 80 has a vertical portion 81 and an inclined portion 82. The vertical portion 81 is the part that extends in the vertical direction, and the inclined portion 82 is the part that is inclined with respect to the vertical direction. Specifically, the vertical portion 81 extends vertically upward from the upper end of the main body portion 21, and the inclined portion 82 is continuous with the upper end of the vertical portion 81 and is inclined with respect to the vertical direction such that it is located further back (away from the opening 8) as it moves from the bottom to the top.

[0134] The second positioning member 80, like the positioning member 70, is formed to a height that allows it to fit inside the bonnet 22, i.e., inside the power generation equipment room 6A (machine room), when the bonnet 22 is closed. The second positioning member 80, like the outer portion 71 of the positioning member 70, may not be covered by the bonnet 22.

[0135] With the above configuration, as shown in Figures 15 and 16, a second positioning member 80 is provided that has an inclined portion 82 at a position opposite to the positioning member 70 that straddles the opening 8 of the main body 21. When installing the unit, the fuel tank unit 51 is positioned above the opening 8, between the outer portion 71 of the positioning member 70 and the inclined portion 82 of the second positioning member 80, using the outer portion 71 of the positioning member 70 and the inclined portion 82 of the second positioning member 80 as guides, and the fuel tank unit 51 is lowered by bringing it into contact with the positioning member 70. At this time, even if the fuel tank unit 51 is positioned further rearward than the desired position (directly above the installation position) above the opening 8, the fuel tank unit 51 will come into contact with the inclined portion 82 of the second positioning member 80 and descend along the inclined portion 82, leading it forward until its front surface comes into contact with the positioning member 70 and its rear surface comes into contact with the vertical portion 81 of the second positioning member 80, leading it to the appropriate position (directly above the installation position). Then, by continuing to lower the fuel tank unit 51, it will be guided to the predetermined installation position without any displacement in the front-rear direction. Therefore, according to the construction machine 10 of Embodiment 7, the fuel tank unit 51 can be smoothly lowered even without accurately aligning the fuel tank unit (internal components) 51 above the opening 8.

[0136] Other embodiments In the above embodiments and modifications, the case in which the mounted object according to the present invention is a fuel tank unit 51 has been described. However, the mounted object may be any other component that is suspended from a crane 61 or the like and installed in the machine room 6. For example, if the construction machine 10 has a large battery in the machine room 6, the battery may be used as the mounted object, and a positioning member 70 or the like may be provided to guide the battery to its installation position inside the machine room 6 by contacting the battery when removing a used battery and installing a charged battery. Furthermore, the fuel tank 55 of the fuel tank unit 51 is not limited to a hydrogen tank, but may be a gas tank filled with a gaseous fuel such as LP gas, or a liquid tank filled with a liquid fuel such as diesel fuel.

[0137] Furthermore, in each of the above embodiments and modifications, the positioning member 70 was composed of the seventh support column 28g and the eighth support column 28h of the guard frame 23. However, the positioning member 70 may be composed of a separate component from the guard frame 23. For example, the positioning member 70 may consist only of an outer portion 71 and be fixed to the guard cover 24 that constitutes the upper surface of the main body portion 21, or it may be attached to the rear surface of the guard frame 23 (seventh support column 28g, eighth support column 28h, or beam 29) as shown in Figure 17.

[0138] Furthermore, as shown in Figure 17, the positioning member 70 may be made replaceable by constructing it as a separate component from the guard frame 23 and attaching it to the guard frame 23 with bolts 90. The positioning member 70 is in contact with the fuel tank unit (internal component) 51 when the unit is installed (when the mounted component is installed), and there is a risk of damage from repeatedly attaching and detaching the fuel tank unit 51. Therefore, as described above, by constructing the positioning member 70 as a separate component from the guard frame 23 and making it replaceable, only the positioning member 70 can be replaced without disassembling the guard frame 23. In addition, the guard frame 23 may be configured to have higher rigidity than the positioning member 70. With such a configuration, if the fuel tank unit (internal component) 51 is accidentally struck against the positioning member 70, the positioning member 70 will deform, absorbing the impact and preventing it from acting on the guard frame 23, thus protecting the guard frame 23.

[0139] Furthermore, as shown in Figure 18, the positioning member 70 may be a separate component from the guard frame 23, and may be configured to be movable (up and down) between an upper position where the outer portion 71 is located above the main body 21 (see the right-hand diagram in Figure 18) and a lower position where the outer portion 71 is not located above the main body 21 (see the left-hand diagram in Figure 18). The lifting mechanism for raising and lowering the positioning member 70 may be of other types, such as a hydraulic cylinder, gear motor, and rack. With such a configuration, the outer portion 71 of the positioning member 70 can be positioned above the main body 21 only when necessary (when installing the unit) to serve as a marker when installing the fuel tank unit 51, and when the marker is not needed, the outer portion 71 can be housed inside the main body 21 to eliminate unnecessary protrusions. In addition, when positioning the positioning member 70 at a height that can be seen from a distance, it is only necessary to move the positioning member 70 to the upper position, and there is no need to configure the positioning member 70 to have a long vertical length. Furthermore, since the outer portion 71 can be housed inside the main body 21, the protruding height of the outer portion 71 is not limited to the height covered by the bonnet 22, and can be set to a height that is easily visible to the crane operator 61.

[0140] Furthermore, in each of the above embodiments and modifications, the positioning member 70 was provided on the front edge bordering the opening 8 of the main body 21, but the installation position of the positioning member 70 is not limited to the front edge bordering the opening 8. The positioning member 70 may be provided at a position where the guide portion is in contact with the outer shape of the fuel tank unit 51 in a plan view, and may be provided on the rear edge of the opening 8, or on the left and right side edges of the opening 8. Also, if the fuel tank unit 51 is located in the central part of the opening 8, away from the peripheral edge of the opening 8, the positioning member 70 may be provided in the central part of the opening 8.

[0141] Furthermore, in each of the above embodiments and modifications, the positioning member 70 was composed of a rod-shaped member (support column 28) extending in the vertical direction. However, in embodiments 1 and 7, it does not have to be a rod-shaped member, but may be composed of a plate-shaped member. Also, in embodiments 2 to 6, a part of the plate-shaped member may be bent to form a recess or a protrusion, and the part of the plate-shaped member (recess or protrusion) may be used as the positioning member 70.

[0142] Furthermore, in the above embodiments and modifications, an example was described in which two positioning members 70 are provided on one side bordering the opening 8 of the main body 21. However, the number of positioning members 70 is not limited to two; there may be one, three or more, or any number of positioning members 70. Also, the multiple positioning members 70 do not all need to be provided on one side bordering the opening 8; they may be provided at different positions (for example, on either the front or rear side edge and either the left or right side edge of the opening 8).

[0143] Furthermore, in each of the above embodiments and modifications, the holding member 56 was made of a housing made of steel plate or the like, but it may be of any other shape as long as it can hold the fuel tank 55, for example, it may be a wire cage shape.

[0144] Furthermore, the second positioning member 80 added in the construction machine 10 of Embodiment 7 is also applicable to the construction machines 10 of Embodiments 2 to 6. When the second positioning member 80 is applied to Embodiments 2 to 6, when the unit is installed, the protrusion of the positioning member 70 fits into the recess formed in either the positioning member 70 or the fuel tank unit (internal mounting) 51, thereby suppressing lateral displacement of the fuel tank unit 51, and the positioning member 70 and the second positioning member 80 suppress lateral displacement of the fuel tank unit 51. Therefore, the fuel tank unit 51 can be installed in the installation position with greater precision. [Industrial applicability]

[0145] As described above, the present invention is useful for construction machinery. [Explanation of Symbols]

[0146] 1. Lower running body 3. Swivel Frame 7. Counterweight (rear-mounted equipment) 8 aperture 10 Construction Machinery 20 Casing 21 Main body 51 Fuel tank unit (internal components) 70 Positioning member 71 Outer part 72 recesses 74 Convex part 75 Lower widening section 77 Upper widening section 79 Inner part 80 Second positioning member

Claims

1. Lower running body and A swivel frame is provided on the lower traveling body described above so as to be rotatable, A rear mount provided at the rear of the above-mentioned slewing frame, A construction machine comprising a detachable internal mount housed in a casing provided on the front side of the rear mount on the above-mentioned slewing frame, The casing has a main body portion for storing the internal components, with an opening formed on its upper surface that allows the internal components to be inserted and removed. The system includes a positioning member that is positioned in contact with the outer shape of the internally mounted object at a predetermined installation position in a plan view, extends in the vertical direction, and has a guiding portion that allows vertical sliding of the internally mounted object, The positioning member has an outer portion located above the main body. A construction machine characterized by the following features.

2. In the construction machine described in claim 1, The outer portion described above is positioned such that at least its upper end is above the upper end of the rear mount described above. A construction machine characterized by the following features.

3. In the construction machine described in claim 1, The above-mentioned internally mounted object has a recess that extends in the vertical direction, The guide portion is a vertically extending protrusion that fits into the recess of the internal mount, and by lowering the internal mount from above the opening with the protrusion fitted into the recess of the internal mount, the internal mount is guided to the predetermined installation position. A construction machine characterized by the following features.

4. In the construction machine described in claim 1, The above internally mounted object has a protrusion that extends in the vertical direction, The guide portion is a recess extending in the vertical direction into which the protrusion of the internally mounted object fits. By lowering the internally mounted object from above the opening while the protrusion of the internally mounted object is fitted into the recess, the internally mounted object is guided to the predetermined installation position. A construction machine characterized by the following features.

5. In the construction machine described in claim 3, The lower end of the recess described above is configured as a lower widening section, which becomes wider from the top to the bottom. A construction machine characterized by the following features.

6. In the construction machine described in claim 4, The upper end of the recess described above is configured as an upper widening section, which becomes wider from the bottom to the top. A construction machine characterized by the following features.

7. In the construction machine according to any one of claims 1 to 6, Multiple positioning members are provided. A construction machine characterized by the following features.

8. In the construction machine according to any one of claims 1 to 6, The positioning member has an inner portion that extends downward in continuous with the lower end of the outer portion, The above-mentioned guide portion is formed to extend from the outer portion to the inner portion. A construction machine characterized by the following features.

9. In the construction machine according to any one of claims 1 to 6, The positioning member described above is configured to be movable between an upper position where the outer portion is located above the main body and a lower position where the outer portion is not located above the main body. A construction machine characterized by the following features.

10. In the construction machine according to any one of claims 1 to 6, A second positioning member extending in the vertical direction is provided at a position opposite to the positioning member on either side of the opening of the main body, The second positioning member described above is configured such that at least its upper end is an inclined portion that slopes vertically so as it moves from the bottom to the top, it moves further away from the opening. A construction machine characterized by the following features.

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