Hydrogen tank device of construction machine, and construction machine including same

Abstract

This hydrogen tank device comprises: a plate-shaped frame body formed in a rectangular shape when viewed from one side in a first direction; and a plurality of hydrogen tanks extending in the longitudinal direction of the frame body and attached to the frame body in parallel with each other. The frame body has, on one side in the first direction, an attachment surface attached to a frame of the construction machine.

Description

Hydrogen tank device for construction machinery and construction machinery equipped with the same

[0001] The present disclosure relates to a hydrogen tank device mounted on a construction machine, and a construction machine equipped with the same.

[0002] In construction machinery, the use of fuel cells instead of diesel engines is being considered in order to achieve carbon neutrality. A known example of construction machinery equipped with a fuel cell is the hydraulic excavator described in Patent Document 1. In the hydraulic excavator described in Patent Document 1, the fuel cell generates electricity using hydrogen supplied from a hydrogen tank and oxygen from the atmosphere. The generated electricity is supplied to an electric pump device. This drives the electric pump device and discharges hydraulic oil. The hydraulic fluid is then supplied to hydraulic actuators such as a boom cylinder, thereby operating the hydraulic excavator.

[0003] Patent No. 7149447 specification

[0004] As described above, the hydraulic excavator of Patent Document 1 has a configuration that differs from conventional hydraulic excavators, such as a hydrogen tank and a fuel cell. However, for hydraulic excavators such as those of Patent Document 1, it is desirable not to design a dedicated frame, but to use the frame and the like of hydraulic excavators equipped with diesel engines (i.e., conventional hydraulic excavators) as is. Therefore, it is desirable to provide a structure that allows a hydrogen tank to be easily attached to the frame.

[0005] Therefore, an object of the present disclosure is to provide a hydrogen tank device that allows a hydrogen tank to be easily attached to the frame of a construction machine, and a construction machine equipped with the same.

[0006] The hydrogen tank device disclosed herein comprises a plate-shaped frame body that is rectangular when viewed from one side in a first direction, and a plurality of hydrogen tanks that extend in the longitudinal direction of the frame body and are attached to the frame body parallel to each other, and the frame body has an attachment surface on one side in the first direction that is attached to the frame of a construction machine.

[0007] According to the present disclosure, the frame to which the multiple hydrogen tanks are attached is configured to be attached to the frame of the construction machine. Therefore, the multiple hydrogen tanks can be attached to the frame of the construction machine in a unitized state. This makes it easy to attach the hydrogen tanks to the construction machine.

[0008] The hydrogen tank device disclosed herein comprises a plate-shaped frame body having a thickness in a first direction and extending in a second direction, a plurality of hydrogen tanks extending in the second direction of the frame body and attached to the frame body parallel to each other, and a plurality of mounting members each provided on the frame body at intervals in the second direction, wherein the frame body has a mounting surface on one side in the first direction that is attached to the frame of a construction machine, and the plurality of hydrogen tanks are attached to the frame body by attaching the plurality of mounting members so that they protrude from the frame body in the other first direction.

[0009] According to the present disclosure, the multiple hydrogen tanks are attached to the frame by attaching multiple mounting members so that they protrude from the frame in the other first direction. Therefore, the multiple hydrogen tanks can be attached to the frame in a protruding state, making it easy to attach the hydrogen tanks to the frame.

[0010] The construction machine of the present disclosure comprises any of the hydrogen tank devices described above, a fuel cell that generates electricity using hydrogen supplied from the hydrogen tank device, and an electric pump device that is driven by electricity supplied from the fuel cell.

[0011] According to the present disclosure, a construction machine having the above-described functions can be realized.

[0012] The construction machine disclosed herein comprises a hydrogen tank device including a plate-shaped frame body having a thickness in a first direction and extending in a second direction, and a plurality of hydrogen tanks extending in the second direction and attached to the frame body parallel to each other, and a frame having an erect portion extending upward, and the hydrogen tank device is attached to the frame so that the mounting surface on one side of the frame body in the first direction abuts the erect portion.

[0013] According to the present disclosure, the hydrogen tank device is attached to the frame so that the mounting surface on one side of the frame in the first direction abuts against the side surface of the frame. This allows multiple hydrogen tanks to be attached to the frame of the construction machine in a unitized state, making it easy to install hydrogen tanks in the construction machine.

[0014] According to the present disclosure, a hydrogen tank can be easily attached to the frame of a construction machine.

[0015] The above and other objects, features, and advantages of the present disclosure will become apparent from the following detailed description of preferred embodiments, which proceeds with reference to the accompanying drawings.

[0016] FIG. 1 is a perspective view showing a construction machine equipped with a hydrogen tank device according to a first embodiment of the present disclosure. FIG. 2 is a plan view showing the construction machine of FIG. 1. FIG. 3 is a perspective view showing a hydrogen tank device equipped on the construction machine of FIG. 1. FIG. 4 is an enlarged perspective view showing the hydrogen tank device of FIG. 3. FIG. 5 is a perspective view showing the hydrogen tank device removed from the frame. FIG. 6 is a front view showing the hydrogen tank device of FIG. 5. FIG. 7 is a cross-sectional view showing the frame taken along the cutting line VIII-VIII shown in FIG. 7. FIG. 8 is an enlarged front view showing the hydrogen tank device of FIG. 3 with the supply system unit removed. FIG. 9 is a front view showing a hydrogen tank device according to a second embodiment of the present disclosure. FIG. 10 is a perspective view showing a hydrogen tank device of another embodiment. FIG. 11 is a front view showing a hydrogen tank device of yet another embodiment.

[0017] The hydrogen tank apparatus 1F, 1R of the first embodiment and the hydrogen tank apparatus 1A of the second embodiment according to the present disclosure, as well as the construction machine 2, will be described below with reference to the drawings. Note that the concepts of directions used in the following description are used for convenience of explanation and do not limit the orientation of the configuration of the present disclosure to those directions. Furthermore, the hydrogen tank apparatus 1F, 1R, 1A and the construction machine 2 described below are merely one embodiment of the present disclosure. Therefore, the present disclosure is not limited to the embodiments, and additions, deletions, and modifications are possible within the scope of the present disclosure.

[0018] <First Embodiment> [Construction Machine] A construction machine 2 shown in Figures 1 and 2 operates using hydrogen as fuel. In this embodiment, the construction machine 2 is a shovel 2. The shovel 2 includes a traveling device 11, a revolving body 12, a boom 13, an arm 14, and a bucket 15. The traveling device 11 includes, for example, a pair of crawlers 11L, 11R. Each of the crawlers 11L, 11R can be driven to move in various directions. The revolving body 12 is provided on the traveling device 11 so as to be rotatable about a rotation axis L1 extending in the vertical direction. The boom 13 is provided on the revolving body 12 so as to be swingable in the vertical direction. The arm 14 is provided at the tip of the boom 13 so as to be swingable in the front-rear direction. Furthermore, the bucket 15 is provided at the tip of the arm 14 so as to be swingable in the front-rear direction or up-down direction. The front-rear direction is the direction in which the boom 13 extends.

[0019] The traveling unit 11, the revolving unit 12, the boom 13, the arm 14, and the bucket 15 are each provided with a hydraulic actuator (not shown). More specifically, each of the crawlers 11L, 11R of the traveling unit 11 is provided with a travel motor. The travel motors are supplied with hydraulic fluid to drive the crawlers 11L, 11R. This allows the traveling unit 11 to move in various directions. The hydraulic fluid is, for example, a liquid such as oil. The revolving unit 12 is also provided with a swing motor (not shown). The swing motor swings the revolving unit 12 when hydraulic fluid is supplied to it. The boom 13, the arm 14, and the bucket 15 are each provided with a cylinder (not shown). When hydraulic fluid is supplied to each cylinder, the boom 13, the arm 14, and the bucket 15 swing, respectively.

[0020] The excavator 2 also includes a hydraulic drive system 3. The hydraulic drive system 3 supplies hydraulic fluid to each of the hydraulic actuators described above to drive each of the hydraulic actuators. As shown in FIG. 3 , the hydraulic drive system 3 includes an electric pump device 21, a fuel cell 22, and multiple hydrogen tank devices 1F, 1R. In this embodiment, the hydraulic drive system 3 includes two hydrogen tank devices 1F, 1R. The hydraulic drive system 3 also includes a multi-control valve (not shown) to control the flow of hydraulic fluid supplied to each of the hydraulic actuators.

[0021] The electric pump device 21 is driven by electric power supplied from a fuel cell 22, which will be described in detail later. The electric pump device 21 discharges hydraulic fluid. More specifically, the electric pump device 21 includes a hydraulic pump 31 and an electric motor 32. The hydraulic pump 31 discharges hydraulic fluid when driven to rotate. The hydraulic pump 31 is, for example, a tandem-type swash plate piston pump. Note that the hydraulic pump 31 may be a single-type swash plate piston pump or another type of hydraulic pump, such as a bent-axis pump or a gear pump. The electric motor 32 is connected to the hydraulic pump 31. The electric motor 32 receives a supply of electric power to drive the hydraulic pump 31 to rotate. This causes hydraulic fluid to be discharged from the hydraulic pump 31. In the electric pump device 21 configured in this manner, the hydraulic pump 31 and the electric motor 32 share a shaft member 33, and the hydraulic pump 31 and the electric motor 32 are arranged in a straight line, for example.

[0022] The multi-control valve (not shown) is connected to the electric pump device 21 and each hydraulic actuator (not shown). The multi-control valve controls the flow of hydraulic fluid discharged from the electric pump device 21 and supplies it to each hydraulic actuator. This allows the traveling device 11, the revolving body 12, the boom 13, the arm 14, and the bucket 15 to be operated.

[0023] The fuel cell 22 generates electricity from the supplied hydrogen and oxygen. The fuel cell 22 is electrically connected to the electric pump device 21, although not shown. More specifically, the fuel cell 22 is electrically connected to the electric motor 32. The fuel cell 22 supplies the generated electricity to the electric motor 32, thereby driving the electric pump device 21. This makes it possible to supply hydraulic fluid to each hydraulic actuator.

[0024] [Hydrogen Tank Device] The two hydrogen tank devices 1F, 1R shown in Figure 4 are devices for storing hydrogen and supplying that hydrogen to the fuel cell 22. That is, the hydrogen tank devices 1F, 1R are connected to the fuel cell 22 via a supply pipe 34. The configurations of the two hydrogen tank devices 1F, 1R are similar to each other, as shown in Figure 5. The following mainly describes the configuration of the first hydrogen tank device 1F, which is one of the two hydrogen tank devices 1F, 1R. Regarding the configuration of the other, the second hydrogen tank device 1R, differences from the first hydrogen tank device 1F will be mainly described, and the same components will be assigned the same reference numerals and their description will be omitted.

[0025] As shown in FIG. 5 , the first hydrogen tank device 1F includes a frame 41 and a plurality of hydrogen tanks 42. In this embodiment, the first hydrogen tank device 1F includes two hydrogen tanks 42. The first hydrogen tank device 1F is unitized by attaching the two hydrogen tanks 42 to the frame 41. The first hydrogen tank device 1F is then attached to the frame 24 of the shovel 2, which will be described in detail later (see FIG. 7 , which will be described in detail later). Because the first hydrogen tank device 1F is unitized as described above, this improves the ease of attaching the two hydrogen tanks 42 to the shovel 2. More specifically, the first hydrogen tank device 1F further includes a plurality of mounting members 43, a supply system unit 44, and a filling system 45, as shown in FIG. 6 . Each component of the first hydrogen tank device 1F will be described below.

[0026] As shown in FIG. 7 , the frame 41 is formed in a rectangular shape when viewed from one side in the first direction. The frame 41 is also formed in a plate shape having a thickness in the first direction. More specifically, the frame 41 includes four plate-like members 41a to 41d. In this embodiment, the four plate-like members 41a to 41d are flat plates. The four plate-like members 41a to 41d are arranged on all four sides (i.e., on both sides in the longitudinal direction and both sides in the lateral direction) so as to have a rectangular shape when viewed from one side in the first direction and a thickness on one side in the first direction. In this embodiment, the longitudinal direction, which is an example of the second direction, is a direction perpendicular to the first direction (in other words, the thickness direction), and the lateral direction is a direction perpendicular to the first direction and the longitudinal direction.

[0027] In this embodiment, the frame body 41 also has a reinforcing plate 41f. The reinforcing plate 41f is bridged across the plate-like members 41a, 41b on both sides in the longitudinal direction at the intermediate portions in the lateral direction of each of the plate-like members 41a, 41b, thereby reinforcing the frame body 41. The frame body 41 also has a mounting surface 41e on one side in the first direction. The mounting surface 41e is the surface on one side in the first direction. The frame body 41 is configured to be mounted to the frame 24, which will be described later, by abutting the mounting surface 41e against the frame 24.

[0028] Furthermore, the frame 41 has multiple suspenders 41g. In this embodiment, the frame 41 has two suspenders 41g. The suspenders 41g are arranged at intervals on one side of the short side (the plate-shaped member 41c in this embodiment). More specifically, as shown in FIG. 6 , the suspenders 41g are arranged on the plate-shaped member 41c so as to be equally spaced apart on both sides of the longitudinal direction from the center line L, which passes through the center of gravity G of the hydrogen tank device 1A and extends in the short side direction, when viewed in the first direction. Each of the suspenders 41g can be used to hook a hook (not shown) of a lifting device such as a crane. The hydrogen tank device 1F is transported by hanging the hooks on the two suspenders 41g and lifting it with a lifting device.

[0029] The hydrogen tank 42 is formed to be elongated in the axial direction. Here, the axial direction is the direction in which the axis of the hydrogen tank 42 extends. The hydrogen tank 42 is capable of storing hydrogen therein. The hydrogen tank 42 has, for example, a tank body 42a and a tank valve 42b. The tank body 42a stores hydrogen, and the tank valve 42b is provided at the opening of the tank body 42a and seals the tank body 42a. The tank valve 42b also controls the flow of hydrogen that is filled into and discharged from the tank body 42a.

[0030] The two hydrogen tanks 42 configured in this manner are attached to the frame 41, lined up in the short direction with their respective axes extending in the longitudinal direction. Explaining in more detail, the two hydrogen tanks 42 are attached to the frame 41, lined up in the short direction via a plurality of mounting members 43, which will be described in detail below. The two hydrogen tanks 42 are attached to the plurality of mounting members 43 so as to protrude from the frame 41 in the other direction in the first direction. The two hydrogen tanks 42 are also arranged in the frame 41 so that the tank valves 42b are located on one side in the longitudinal direction.

[0031] The multiple mounting members 43 are respectively attached to the frame 41 at intervals in the longitudinal direction. In this embodiment, two mounting members 43 are provided on the frame 41. Furthermore, each of the mounting members 43 holds one axial end and the other axial end of each hydrogen tank 42. That is, each of the mounting members 43 holds one longitudinal end and the other longitudinal end of each hydrogen tank 42. More specifically, the mounting member 43 has a bridging portion 43a and a fixing portion 43b, as shown in FIG. 8 .

[0032] The bridge portion 43a is bridged on both short-side portions of the frame body 41, i.e., on each of the plate-like members 41c and 41d on both short-side portions. More specifically, the bridge portion 43a is bridged on each of the plate-like members 41c and 41d on the surface of the frame body 41 on the other side in the first direction (i.e., the surface opposite the mounting surface 41e). In this embodiment, the middle portion of the bridge portion 43a is fixed to the reinforcing plate 41f. More specifically, the bridge portion 43a is, for example, a plate member with an ω-shaped cross section, and is formed in a W-shape when viewed from one side in the longitudinal direction. That is, the bridge portion 43a has two recesses 43c and 43d. The bridge portion 43a is attached to the frame body 41 so that each recess 43c and 43d is located between each of the plate-like members 41c and 41d and the reinforcing plate 41f and recessed toward one side in the first direction. The hydrogen tanks 42 are placed on the mounting members 43a so that portions of them fit into the recesses 43c, 43d. One longitudinal end and the other longitudinal end of the circumferential surface of each of the two hydrogen tanks 42 are pressed against each of the mounting members 43a. As a result, the hydrogen tanks 42 are positioned with the two mounting members 43 protruding from the frame 41 in the other first direction.

[0033] The fixing portion 43b secures the hydrogen tank 42 to the mounting portion 43a. The hydrogen tank 42 is attached to the frame 41 by abutting its peripheral surface against the mounting portion 43a and tightening the fixing portion 43b. This allows the hydrogen tank 42 to be held by the mounting member 43. More specifically, the fixing portion 43b is, for example, a fixing band, and is formed in a roughly U-shape. Both ends of the fixing portion 43b are fixed to both short sides of the recesses 43c and 43d of the mounting portion 43a. The fixing portion 43b arranged in this manner, together with the recesses 43c and 43d, surrounds the peripheral surface of the hydrogen tank 42 placed in each of the recesses 43c and 43d. Furthermore, the fixing portion 43b has an adjustment device 43e, such as a screw, in its middle portion, and its length can be adjusted by tightening the adjustment device 43e. Therefore, by tightening the adjuster 43e, the fixing portion 43b can tighten the circumferential surface of the hydrogen tank 42 and fix it to the bridging portion 43a. In this way, the hydrogen tank 42 is attached to the frame 41.

[0034] As shown in FIG. 9, the supply system unit 44 includes a first piping member 44a, a plurality of valves 44b to 44f, and a mounting plate 44g. The supply system unit 44 further includes a plurality of sensors 44h and 44i. The supply system unit 44 is formed by attaching the first piping member 44a, the plurality of valves 44b to 44f, and the plurality of sensors 44h and 44i to a mounting plate 44g. The supply system unit 44 is attached to the frame 41 so as to be located on one longitudinal side of the hydrogen tank 42, i.e., adjacent to the tank valve 42b, as shown in FIG. 6. The configuration of the supply system unit 44 will be described in further detail below.

[0035] As shown in FIG. 3, the first piping member 44a is connected to the tank valves 42b of the two hydrogen tanks 42. Hydrogen discharged from each hydrogen tank 42 flows through the first piping member 44a. As shown in FIG. 9, multiple valves 44b to 44f are provided on the first piping member 44a. The multiple valves 44b to 44f control the flow of hydrogen. The multiple valves 44b to 44f are, for example, five valves 44b to 44f: a high-pressure pressure-reducing valve 44b, a shutoff valve 44c, a low-pressure pressure-reducing valve 44d, a first manual valve 44e, and a second manual valve 44f. The high-pressure pressure-reducing valve 44b, the shutoff valve 44c, and the low-pressure pressure-reducing valve 44d are arranged in that order on the first piping member 44a from the upstream side, i.e., the tank side. The first manual valve 44e is connected between the high-pressure pressure-reducing valve 44b and the shutoff valve 44c, and the second manual valve 44f is connected downstream of the low-pressure pressure-reducing valve 44d. Furthermore, the low-pressure pressure reducing valve 44d is connected to the supply pipe 34 via a sensor 44i, which will be described in detail later. The low-pressure pressure reducing valve 44d is then connected to the fuel cell 22 via the supply pipe 34, as shown in Figure 3. This allows the high-pressure hydrogen stored in the hydrogen tank 42 to be reduced to a low pressure (e.g., 100 KPa) and supplied to the fuel cell 22.

[0036] The plurality of sensors 44h, 44i are provided in the first piping member 44a. In this embodiment, two sensors 44h, 44i are provided in the first piping member 44a. The two sensors 44h, 44i are, for example, pressure sensors. The first sensor 44h is connected, for example, between the high-pressure pressure reducing valve 44b and the shut-off valve 44c. The second sensor 44i is connected downstream of the low-pressure pressure reducing valve 44d, as described above.

[0037] The mounting plate 44g is provided with a first piping member 44a and five valves 44b to 44f. Two sensors 44h and 44i are also attached to the mounting plate 44g. More specifically, the mounting plate 44g is a rectangular plate-like member when viewed from the first direction. The shape of the mounting plate 44g is not limited to a rectangular shape and may be other shapes. The first piping member 44a, the five valves 44b to 44f, and the two sensors 44h and 44i are attached to the main surface of the mounting plate 44g, which is the surface on one side in the thickness direction (the surface on the other side in the first direction in this embodiment). In this embodiment, the high-pressure pressure-reducing valve 44b, the first sensor 44h, the shut-off valve 44c, and the low-pressure pressure-reducing valve 44d are arranged on the main surface of the mounting plate 44g in this order from one side in the longitudinal direction of the mounting plate 44g. Furthermore, the portion of the first piping member 44a connecting the high-pressure pressure reducing valve 44b, the first sensor 44h, the shut-off valve 44c, and the low-pressure pressure reducing valve 44d is attached and fixed to a mounting plate 44g. Furthermore, the first manual valve 44e, the second manual valve 44f, and the second sensor 44i are connected to the first piping member 44a so as to branch off from the first piping member 44a. The first manual valve 44e, the second manual valve 44f, and the second sensor 44i are also arranged on the main surface of the mounting plate 44g, like the other valves 44b to 44d.

[0038] 6, mounting plate 44g is attached to the surface of frame 41 opposite mounting surface 41e. Furthermore, mounting plate 44g is attached to frame 41 so as to be located on one longitudinal side of hydrogen tank 42. This allows valves 44b to 44f (more specifically, high-pressure / pressure-reducing valve 44b) to be positioned adjacent to tank valve 42b.

[0039] 4, the second hydrogen tank device 1R includes a frame 41, two hydrogen tanks 42, and multiple mounting members 43, as well as a second piping member 44j. The second piping member 44j is connected to the tank valves 42b of each of the two hydrogen tanks 42. The second piping member 44j is further connected to the first piping member 44a of the first hydrogen tank device 1F. The second piping member 44j allows hydrogen discharged from each hydrogen tank 42 of the second hydrogen tank device 1R to merge with the first piping member 44a.

[0040] The filling system 45 shown in FIG. 6 is detachably connected to a filling nozzle at a hydrogen station (not shown). The filling system 45 supplies hydrogen from the filling nozzle to each of the hydrogen tanks 42, filling each of the hydrogen tanks 42. The filling system 45 is attached to the frame 41 so as to be located on one longitudinal side of the hydrogen tank 42, i.e., adjacent to the tank valve 42b. Furthermore, as described above, the supply system unit 44 is positioned adjacent to the tank valve 42b. Therefore, the filling system 45, supply system unit 44, and tank valve 42b are arranged together. The filling system 45 configured in this manner includes a filling pipe 45a and a filling receptacle 45b. More specifically, the filling system 45 further includes a branching block 45c.

[0041] The filling pipe 45a is connected to each of the hydrogen tanks 42. More specifically, the filling pipe 45a is connected to each of the hydrogen tanks 42 via a branching block 45c, which will be described in detail later. In this embodiment, the filling pipe 45a is connected to the tank valve 42b of each hydrogen tank 42 via the branching block 45c. The filling receptacle 45b is provided at a hydrogen filling port (not shown) of the shovel 2. The filling receptacle 45b is configured to allow the filling nozzle described above to be attached and detached. The filling receptacle 45b is also connected to each of the hydrogen tanks 42 via the filling pipe 45a. More specifically, the filling receptacle 45b is connected to each of the hydrogen tanks 42 via the filling pipe 45a and the branching block 45c. In this embodiment, the filling pipe 45a and the filling receptacle 45b are arranged adjacent to the tank valve 42b. In addition, although the filling pipe 45 a and the filling receptacle 45 b are not attached to the frame body 41 in this embodiment, at least one of them may be attached to the frame body 41 .

[0042] The branching block 45c is connected to the four hydrogen tanks 42 and branches the supplied hydrogen to each of the hydrogen tanks 42. This allows each of the hydrogen tanks 42 to be filled with hydrogen. The branching block 45c is disposed adjacent to the tank valve 42b. The branching block 45c is attached to, for example, the frame 41 (mounting surface 41e in this embodiment). The branching block 45c may also be a flow dividing valve that divides the hydrogen to be filled into each of the hydrogen tanks 42.

[0043] In the filling system 45 configured as described above, a filling nozzle is connected to the filling receptacle 45b to supply hydrogen. The hydrogen is then guided through the filling pipe 45a to the branching block 45c. The branching block 45c branches the hydrogen and supplies it to each hydrogen tank 42. In this way, each hydrogen tank 42 is filled with hydrogen.

[0044] [Hydrogen Tank Device Housing Structure] As described above, the hydrogen tank devices 1F, 1R are housed in the rotating structure 12 together with the electric pump device 21 and the fuel cell 22 (see FIG. 3). The rotating structure 12 is configured as follows to house the electric pump device 21, the fuel cell 22, and the hydrogen tank devices 1F, 1R.

[0045] That is, as shown in Figures 1 to 3, the revolving unit 12 includes, for example, a cabin 12a, a battery housing section 12b, and a tank housing section 12c. The cabin 12a is configured to allow a driver (or operator) to ride in. The cabin 12a is located, for example, at the front of the revolving unit 12 on one side in the left-right direction, for example, on the left side. Note that the position of the cabin 12a on the revolving unit 12 will be described based on the state in which the boom 13 extends in the fore-and-aft direction. The same applies to the battery housing section 12b and the tank housing section 12c. The battery housing section 12b houses a fuel cell 22. The battery housing section 12b is located on the front side of the revolving unit 12, opposite the cabin 12a, i.e., on the other side in the left-right direction (for example, the right side). The boom 13 is located between the battery housing section 12b and the cabin 12a.

[0046] The tank housing section 12c houses the electric pump device 21 and the hydrogen tank devices 1F, 1R. The tank housing section 12c is located rearward of the cabin 12a and the battery housing section 12b. That is, the tank housing section 12c extends left and right in the rear portion of the rotating body 12. The tank housing section 12c is located adjacent to the rear of the cabin 12a. The tank housing section 12c is also located rearward of the battery housing section 12b, with a passage 12d between the tank housing section 12c and the battery housing section 12b, which is connected to the cabin 12a.

[0047] Furthermore, a frame 24 is provided in the tank housing portion 12c, as shown in Figure 3. The electric pump device 21 and hydrogen tank devices 1F, 1R are attached to the frame 24. This allows the electric pump device 21 and hydrogen tank devices 1F, 1R to be housed in the tank housing portion 12c. The tank housing portion 12c is also covered with a cover 12e (see Figure 3). An opening / closing portion 12f is formed on the top surface of the cover 12e (see Figure 1). When the opening / closing portion 12f is opened, the frame 24 is exposed upward through the opening / closing portion 12f.

[0048] The frame 24 is formed by combining multiple plate-shaped frame members. The frame 24 is a roughly rectangular parallelepiped frame extending in the left-right direction. For example, the frame 24 is E-shaped when viewed from the side in the left-right direction, and is placed on the tank accommodating section 12c with the E tilted 90 degrees so that the opening faces upward. Therefore, no frame members are arranged across the upper part of the frame 24, making it easy to insert the electric pump device 21 and hydrogen tank devices 1F, 1R from above, as will be described in detail later.

[0049] More specifically, the frame 24 has a base frame 24a and a plurality of standing portions 24b to 24d. The base frame 24a is formed, for example, in a rectangular shape that is long in the left-right direction in a plan view. The base frame 24a is placed, for example, on the base of the rotating body 12. In this embodiment, the base frame 24a is reinforced by reinforcing members that extend in the front-rear direction and the left-right direction.

[0050] The multiple standing portions 24b-24d are portions of the frame 24 that are arranged to stand up. That is, the multiple standing portions 24b-24d are provided on the base frame 24a so as to stand upward. In this embodiment, the frame 24 has three standing portions 24b-24d. The standing portions 24b-24d are arranged to be spaced apart from one another in the front-to-rear direction. In this embodiment, the standing portions 24b-24d are provided in a front-to-rear middle portion and at both front-to-rear end portions of the base frame 24a. Furthermore, the standing portions 24b-24d are formed, for example, in an inverted U-shape when viewed from the front, and are provided on the base frame 24a so as to span both left and right edges. Note that the standing portions 24b-24d are also configured by reinforcing the U-shaped frame with reinforcing members extending in the up-and-down direction.

[0051] In the frame 24 configured in this manner, adjacent upright portions 24b-24d form storage spaces 24e, 24f between them. The first upright portion 24b has a mounting surface 24g facing the storage space 24e, and the second upright portion 24c has a mounting surface 24h facing the storage space 24f. The two hydrogen tank devices 1F, 1R are mounted in predetermined positions on the upright portions 24b, 24c so that the mounting surfaces 41e of the respective frames 41 abut against the mounting surfaces 24g, 24h, respectively.

[0052] More specifically, the two hydrogen tank devices 1F, 1R are attached to the frame 24 so that the longitudinal direction of the frame body 41 extends in the left-right direction. That is, the two hydrogen tank devices 1F, 1R are attached to the frame 24 so that the axes of the hydrogen tanks 42 extend in the left-right direction. As a result, the two hydrogen tank devices 1F, 1R are housed in the storage spaces 24e, 24f of the frame 24 so that the axes of the hydrogen tanks 42 extend in the left-right direction. Furthermore, the two hydrogen tank devices 1F, 1R are arranged so that the supply system unit 44 is located on the right side. Therefore, the supply system unit 44 is located closer to the fuel cell 22 in each of the two hydrogen tank devices 1F, 1R. In this embodiment, the two hydrogen tank devices 1F, 1R are attached to the frame 24 by welding or fastening members such as bolts. Furthermore, the outer dimensions of the upright portions 24b-24d of the frame 24 are larger than the outer dimensions of the frame body 41 of each of the hydrogen tank devices 1F, 1R. More specifically, the external shapes of the standing portions 24b to 24d are such that the supply system unit 44 attached to the frame body 41 does not protrude from each of the standing portions 24b to 24d when viewed from the front.

[0053] Furthermore, in the frame 24, in addition to the hydrogen tank device 1F, the electric pump device 21 is accommodated in the accommodation space 24e. More specifically, the electric pump device 21 is disposed closer to the third upright portion 24d than the hydrogen tank device 1F in the accommodation space 24e. As described above, the electric pump device 21 has the hydraulic pump 31 and electric motor 32 arranged in a straight line, and the electric pump device 21 is arranged so that the hydraulic pump 31 and electric motor 32 are aligned in the left-right direction. Furthermore, the electric pump device 21 has the hydraulic pump 31 arranged on the left side (i.e., the cabin 12a side), for example. This allows the electric motor 32 to be positioned closer to the fuel cell 22 and the hydraulic pump 31 to be positioned away from the supply system unit 44. The electric pump device 21 is attached to the frame 24 so as to rest on the base frame 24a of the frame 24 (more specifically, on the reinforcing member of the base frame 24a).

[0054] [Method of Mounting Hydrogen Tank Devices] The method of mounting the hydrogen tank devices 1F, 1R to the frame 24 is described below. First, the hydrogen tank devices 1F, 1R are unitized in advance by attaching the hydrogen tank 42 and supply system unit 44 to the frame 41. Then, the hydrogen tank devices 1F, 1R are mounted to the frame 24. When mounting the hydrogen tank devices 1F, 1R to the frame 24, the opening / closing portion 12f of the rotating body 12 of the excavator 2 is opened. This exposes the frame 24 upward. Each of the hydrogen tank devices 1F, 1R is then lifted up by a lifting device (not shown). For example, a hook of the lifting device is attached to the lifting portion 41g of one of the hydrogen tank devices 1F, 1R, for example, the first hydrogen tank device 1F. The hydrogen tank device 1F is then lifted up by the lifting device. As a result, the first hydrogen tank device 1F is lifted up with the frame 41 upright, and transported in this state to above the frame 24. The first hydrogen tank device 1F is then lowered onto the frame 24. More specifically, the first hydrogen tank device 1F is lowered into the storage space 24e. At this time, the mounting surface 41e of the frame 41 of the first hydrogen tank device 1F is abutted against the mounting surface 24g of the standing portion 24b. Furthermore, the position of the first hydrogen tank device 1F is fine-tuned so that it is located at a predetermined position on the standing portion 24b. Then, once placed in the predetermined position, the first hydrogen tank device 1F is attached to the standing portion 24b by welding or fastening members. The first hydrogen tank device 1F is then removed from the hanging device.

[0055] The second hydrogen tank device 1R is also attached to the upright portion 24c in a similar manner. That is, the second hydrogen tank device 1R is lifted by a lifting device and then lowered into the storage space 24f. At this time, the mounting surface 41e of the second hydrogen tank device 1R is abutted against the mounting surface 24h of the upright portion 24c. The position of the second hydrogen tank device 1R is then fine-tuned so that it is located at a predetermined position on the upright portion 24c. Once placed in the predetermined position, the second hydrogen tank device 1R is attached to the upright portion 24c by welding or fastening members. Furthermore, in the second hydrogen tank device 1R, the second piping member 44j is connected to the first piping member 44a. Finally, the filling receptacle 45b of the filling system 45 is attached to the filling port (not shown) of the excavator 2. The second hydrogen tank device 1R is then removed from the lifting device, and the opening / closing member 12f is closed.

[0056] In the hydrogen tank devices 1F, 1R of this embodiment, two hydrogen tanks 42 are attached to a frame 41. The frame 41 is formed so as to be attached to the frame 24. Therefore, the two hydrogen tanks 42 can be attached to the frame 24 of the shovel 2 in a unitized state. This makes it easy to attach the hydrogen tanks 42 to the shovel 2.

[0057] Furthermore, in the hydrogen tank apparatus 1F, 1R of this embodiment, the frame 41 is attached to the frame 24 that is erected on the excavator 2. Therefore, the hydrogen tank apparatus 1F, 1R can be attached to the frame 24 by lowering the hydrogen tank apparatus 1F, 1R from above and aligning it along the frame 24. This makes it easy to attach the hydrogen tank apparatus 1F, 1R to the frame 24.

[0058] Furthermore, in the hydrogen tank apparatus 1F, 1R of this embodiment, the frame 41 includes two hanging portions 41g arranged at a distance from each other on one side in the short direction. Therefore, the hydrogen tank apparatus 1F, 1R can be lifted up, lowered from above, and leaned against the frame 24. This makes it easy to attach the hydrogen tank apparatus 1F, 1R to the frame 24.

[0059] Furthermore, in the hydrogen tank devices 1F, 1R of this embodiment, the two hydrogen tanks 42 are attached to the frame 41 by attaching two mounting members 43 so that they protrude from the frame 41 in the other of the first direction. Therefore, the two hydrogen tanks 42 can be attached to the frame 41 in a protruding state. In other words, the hydrogen tanks 42 do not need to be inserted into the frame 41 as in the case where the frame 41 has a three-dimensional shape such as a rectangular parallelepiped, and therefore it is easy to attach the hydrogen tanks 42 to the frame 41.

[0060] Furthermore, in the hydrogen tank devices 1F and 1R of this embodiment, the mounting members 43 respectively hold one longitudinal end and the other longitudinal end (one axial end and the other axial end in this embodiment) of the hydrogen tank 42. This allows the hydrogen tank 42 to be firmly held in the frame 41.

[0061] Furthermore, in the hydrogen tank apparatus 1F, 1R of this embodiment, the hydrogen tank 42 is attached to the frame 41 by abutting its peripheral surface against the mounting portion 43a and fastening it with the fixing portion 43b. Therefore, the hydrogen tank 42 can be easily fixed to the frame 41.

[0062] Furthermore, in the hydrogen tank apparatus 1F of this embodiment, the supply system unit 44 includes a piping member 44a, five valves 44b to 44f, and a mounting plate 44g, and is attached to the frame 41. Therefore, the supply system unit 44 can be manufactured in advance and then attached to the frame 41. This makes it easier to manufacture the hydrogen tank apparatus 1F.

[0063] Furthermore, in the hydrogen tank apparatus 1F of this embodiment, the two hydrogen tanks 42 are arranged in the frame 41 so that the tank valves 42b are located on one longitudinal side. Furthermore, the supply system unit 44 is attached to the frame 41 so that it is located on one longitudinal side of the hydrogen tanks 42. Therefore, the distance between the tank valves 42b and the supply system unit 44 can be shortened, and the piping members 44a connecting them can also be shortened.

[0064] Furthermore, in the hydrogen tank apparatus 1F of this embodiment, the mounting plate 44g is attached to the frame 41 on the side opposite the mounting surface 41e. Furthermore, the piping member 44a and the five valves 44b to 44f are attached to the main surface of the mounting plate 44g on the other side in the first direction. Therefore, when the hydrogen tank apparatus 1F is attached to the frame 24, the piping member 44a and the five valves 44b to 44f are positioned on the surface of the mounting plate 44g opposite the frame 24. This improves the visibility of the piping member 44a and the five valves 44b to 44f, thereby improving the maintainability of the piping member 44a and the five valves 44b to 44f.

[0065] The hydrogen tank apparatus 1F of this embodiment further includes a filling pipe 45a and a filling receptacle 45b. Therefore, the filling system 45 consisting of the filling pipe 45a and the filling receptacle 45b can be connected to each of the hydrogen tanks 42 beforehand, and then the hydrogen tank apparatus 1F can be attached to the frame 41. This simplifies the installation process when attaching the hydrogen tank apparatus 1F to the excavator 2.

[0066] Furthermore, in the shovel 2 of this embodiment, it is possible to realize a shovel 2 having the functions described above.

[0067] Furthermore, in the excavator 2 of this embodiment, the hydrogen tank devices 1F, 1R are attached to the frame 24 so that the mounting surface 41e of the frame body 41 abuts the upright portions 24b, 24c. Therefore, multiple hydrogen tanks 42 are attached to the frame 24 of the excavator 2 in a unitized state. This makes it easy to attach the hydrogen tanks 42 to the excavator 2.

[0068] Second Embodiment The hydrogen tank apparatus 1A of the second embodiment shown in Figure 10 is mounted on a shovel 2, similar to the hydrogen tank apparatuses 1F and 1R of the first embodiment. The hydrogen tank apparatus 1A of the second embodiment is similar in configuration to the hydrogen tank apparatus 1F of the first embodiment. Therefore, the configuration of the hydrogen tank apparatus 1A of the second embodiment will mainly be described in terms of the differences from the hydrogen tank apparatus 1F of the first embodiment, and the same components will be assigned the same reference numerals and will not be described again.

[0069] The hydrogen tank apparatus 1A of the second embodiment includes a frame 41, multiple hydrogen tanks 42, multiple mounting members 43A, and a supply system unit 44. In this embodiment, the hydrogen tank apparatus 1A includes two hydrogen tanks 42 and two mounting members 43A. The mounting members 43A have a mounting portion 43Aa and a fixing portion 43b. The mounting portion 43Aa is recessed toward one side in the first direction relative to the mounting portion 43a of the hydrogen tank apparatus 1F of the first embodiment. As a result, each of the suspending portions 41g of the frame 41 is positioned on an imaginary line P that passes through the center of gravity G of the hydrogen tank apparatus 1A and extends in the lateral direction when viewed in the longitudinal direction. Therefore, when the hydrogen tank apparatus 1A is lifted by a lifting device via the two suspending portions 41g, the frame 41 can stand upright.

[0070] In the hydrogen tank apparatus 1A of this embodiment, each of the hanging parts 41g is positioned, when viewed in the longitudinal direction, on an imaginary line P that passes through the center of gravity G of the hydrogen tank apparatus 1A and extends in the lateral direction. Therefore, when the frame body 41 is lifted via the two hanging parts 41g, the frame body 41 can be stood upright. This makes it easy to lower the hydrogen tank apparatus 1A straight down from above and align it with the frame 24. Therefore, the hydrogen tank apparatus 1A can be easily attached to the frame 24.

[0071] In addition, the hydrogen tank device 1A of the second embodiment has the same effects as the hydrogen tank device 1F of the first embodiment.

[0072] <Other Embodiments> The hydrogen tank devices 1F, 1R, 1A of the first and second embodiments are mounted on a shovel 2, but may also be mounted on other construction machines such as wheel loaders and cranes. Furthermore, in the hydrogen tank devices 1F, 1R, 1A of the first and second embodiments, the shape of the frame 41 is rectangular when viewed from one side in the first direction, but it may also be trapezoidal, elliptical, or another shape. Furthermore, the frame 41 may be attached to the base frame 24a, or may be attached to the frame 24 of the construction machine 2. Furthermore, the number of hanging portions 41g included in the frame 41 is not limited to two, and may be three or more.

[0073] Furthermore, a reinforcing plate 46 may be attached to the frame body 41B as in the hydrogen tank device 1B shown in Figure 11. The reinforcing plate 46 is formed to have a U-shaped cross section when viewed in the longitudinal direction. The reinforcing plate 46 is provided so as to bridge between the plate-like members 41c, 41d on both sides of the frame body 41B in the lateral direction. Note that the reinforcing plate 46 is not limited to the shape shown in Figure 11. For example, the frame body 41 may be reinforced by a plurality of elongated plate members, and the reinforcing material may be any material that can reinforce the frame body 41.

[0074] The number of hydrogen tanks 42 provided in the hydrogen tank apparatus 1F, 1R, 1A of the first and second embodiments may also be three or more. The number of mounting members 43 provided in the hydrogen tank apparatus 1F, 1R, 1A of the first and second embodiments may also be three or more, in which case, for example, the middle portion of the hydrogen tank 42 may also be held by the mounting members 43. Furthermore, while the frame body 41 and the mounting members 43 are configured as separate bodies in the hydrogen tank apparatus 1F, 1R, 1A, they may also be configured as an integrated unit. Furthermore, the bridging portion 43a and the fixing portion 43b of the mounting member 43 may also be configured as an integrated unit. The configuration of the fixing portion 43b described above is also one example, and it may be configured like a cable tie or belt.

[0075] Furthermore, the supply system unit 44 does not necessarily have to be attached to the frame 41 so as to be close to the tank valve 42b. The supply system unit 44 may also be attached to the frame 24 or another member. The supply system unit 44 has multiple valves 44b to 44f, but it is sufficient that it has at least the high-pressure pressure-reducing valve 44b. The supply system unit 44 may also have an injector instead of the low-pressure pressure-reducing valve 44d.

[0076] Furthermore, in the hydrogen tank apparatus 1F, 1R of this embodiment, the filling system 45 includes a filling receptacle 45b, but it is not necessary to include the filling receptacle 45b. The filling receptacle 45b may be pre-installed, for example, in the filling port 2a of the excavator 2, as shown in FIG. 12. In this case, the filling system 45C of the hydrogen tank apparatus 1C shown in FIG. 12 includes a filling pipe 45a and a filling connector 45d. The filling connector 45d is detachably connected to the filling receptacle 45b. More specifically, the filling receptacle 45b includes a receptacle-side connector 45e. The filling connector 45d is connected to the receptacle-side connector 45e, and thereby connected to the filling receptacle 45b. This allows hydrogen supplied to the filling receptacle 45b to be filled into each hydrogen tank via the filling system 45C.

[0077] The hydrogen tank device 1C configured in this manner further includes a filling pipe 45a and a filling connector 45d. Therefore, the filling system 45C consisting of the filling pipe 45a and the filling connector 45d can be connected to the hydrogen tank 42 beforehand, and then the hydrogen tank device 1C can be attached to the frame 41. This simplifies the installation process when attaching the hydrogen tank device 1C to the excavator 2.

[0078] Furthermore, although the hydrogen tank devices 1F, 1R are lowered from above and placed in the frame 24, they may also be slid into the frame 24 from the side (i.e., from the right or left).

[0079] <Illustrative embodiment> The hydrogen tank device in a first aspect comprises a plate-shaped frame body that is rectangular when viewed from one side in a first direction, and a plurality of hydrogen tanks that extend in the longitudinal direction of the frame body and are attached to the frame body parallel to each other, and the frame body has an attachment surface on one side in the first direction that is attached to the frame of a construction machine.

[0080] According to the above aspect, the frame to which the multiple hydrogen tanks are attached is configured to be attached to the frame of the construction machine. Therefore, the multiple hydrogen tanks can be attached to the frame of the construction machine in a unitized state. This makes it easy to attach the hydrogen tanks to the construction machine.

[0081] In a second aspect, the hydrogen tank device is the hydrogen tank device of the first aspect, wherein the frame is attached to an upright portion of the frame that is arranged to stand up on the construction machine.

[0082] According to the above aspect, the frame is attached to a frame that is erected on the construction machine. Therefore, the hydrogen tank device can be attached to the frame by lowering the hydrogen tank device from above and leaning it against the frame. This makes it easy to attach the hydrogen tank device to the frame.

[0083] In a third aspect, the hydrogen tank device is the hydrogen tank device of the first or second aspect, wherein the frame body includes at least a plurality of hanging portions arranged at intervals from each other on one side in the short direction.

[0084] According to the above aspect, the frame includes a plurality of hanging portions arranged at intervals on one side in the short direction. This allows the hydrogen tank device to be lifted up and lowered from above along the frame. This makes it easy to attach the hydrogen tank device to the frame.

[0085] In a fourth aspect, the hydrogen tank device is the hydrogen tank device of the third aspect, wherein each of the hanging portions is arranged so that, when viewed in the longitudinal direction, it is located on an imaginary line that passes through the center of gravity of the hydrogen tank device and extends in the lateral direction.

[0086] According to the above aspect, each of the hanging parts is arranged so that, when viewed in the longitudinal direction, it is located on an imaginary line that passes through the center of gravity of the hydrogen tank device and extends in the lateral direction. Therefore, when the frame body is lifted via the two hanging parts, the frame body can be stood upright. This makes it easy to lower the hydrogen tank device straight down from above and align it with the frame. Therefore, the hydrogen tank device can be easily attached to the frame.

[0087] In a fifth aspect, the hydrogen tank device is a hydrogen tank device of any of the first to fourth aspects, further comprising a plurality of mounting members each spaced apart longitudinally on the frame body, and the plurality of hydrogen tanks are attached to the frame body via the plurality of mounting members and are attached to the plurality of mounting members so as to protrude from the frame body in the other of the first direction.

[0088] According to the above aspect, the multiple hydrogen tanks are attached to the frame by attaching multiple mounting members so that they protrude from the frame in the other first direction. Therefore, the hydrogen tanks can be attached to the frame in a protruding state, making it easy to attach the hydrogen tanks to the frame.

[0089] A hydrogen tank device in a sixth aspect is the hydrogen tank device of the fifth aspect, wherein the mounting members respectively hold one end and the other end of the hydrogen tank in the longitudinal direction.

[0090] According to the above aspect, the mounting members respectively hold one longitudinal end and the other longitudinal end of the hydrogen tank, thereby enabling the hydrogen tank to be firmly held by the frame.

[0091] In a seventh aspect, the hydrogen tank device is the hydrogen tank device of the fifth or sixth aspect, wherein the mounting member has an erection section that is erected on each of the two short side portions of the frame body, and a fixing section that fixes the hydrogen tank to the erection section, and the hydrogen tank is attached to the frame body by having its peripheral surface abut against the erection section and being tightened by the fixing section.

[0092] According to the above aspect, the hydrogen tank is attached to the frame by abutting the peripheral surface of the hydrogen tank against the mounting portion and fastening it with the fixing portion, so that the hydrogen tank can be easily fixed to the frame.

[0093] In an eighth aspect, the hydrogen tank device is a hydrogen tank device of any one of the first to seventh aspects, further comprising a supply system unit including a piping member connected to a tank valve provided at the mouth of each of the plurality of hydrogen tanks, a valve provided on the piping member, and a mounting plate to which the piping member and the valve are attached, and the supply system unit is attached to the frame body.

[0094] According to the above aspect, the supply system unit includes a piping member, a plurality of valves, and a mounting plate, and is attached to the frame. Therefore, the supply system unit can be attached to the frame after being manufactured in advance. This makes it easier to manufacture the hydrogen tank device.

[0095] In a ninth aspect, the hydrogen tank device is the hydrogen tank device of the eighth aspect, wherein the multiple hydrogen tanks are arranged on the frame so that the tank valves are located on one side in the longitudinal direction, and the supply system unit is attached to the frame so that it is located on one side in the longitudinal direction of the hydrogen tanks.

[0096] According to the above aspect, the hydrogen tanks are arranged in the frame so that the tank valves are located on one side in the longitudinal direction. Furthermore, the supply system unit is attached to the frame so that it is located on one side in the longitudinal direction of the hydrogen tanks. This allows the distance between the tank valves and the supply system unit to be shortened, and therefore the piping connecting them can be shortened.

[0097] In a tenth aspect, the shovel is a hydrogen tank device of the eighth or ninth aspect, wherein the mounting plate is attached to the frame body on the side opposite the mounting surface, and the piping members and the plurality of valves are attached to the main surface of the mounting plate on the other side in the first direction.

[0098] According to the above aspect, the mounting plate is attached to the frame body on the side opposite the mounting surface. The piping members and the multiple valves are attached to the main surface of the mounting plate on the other side in the first direction. Therefore, when the hydrogen tank device is attached to the frame, the piping members and the multiple valves are positioned on the surface of the mounting plate opposite the frame. This improves the visibility of the piping members and the multiple valves, thereby improving the ease of maintenance of the piping members and the multiple valves.

[0099] In an eleventh aspect, the hydrogen tank device comprises a plate-shaped frame body having a thickness in a first direction and extending in a second direction, a plurality of hydrogen tanks extending in the second direction of the frame body and attached to the frame body parallel to each other, and a plurality of mounting members each provided on the frame body at intervals in the second direction, wherein the frame body has a mounting surface on one side in the first direction that is attached to the frame of a construction machine, and the plurality of hydrogen tanks are attached to the frame body by attaching the plurality of mounting members so that they protrude from the frame body in the other first direction.

[0100] According to the above aspect, the multiple hydrogen tanks are attached to the frame by attaching multiple mounting members so that they protrude from the frame in the other first direction. Therefore, the multiple hydrogen tanks can be attached to the frame in a protruding state, making it easy to attach the hydrogen tanks to the frame.

[0101] In a twelfth aspect, the hydrogen tank device is a hydrogen tank device of any one of the first to eleventh aspects, further comprising a filling pipe connected to the hydrogen tank and a filling receptacle connected to the hydrogen tank via the filling pipe.

[0102] According to the above aspect, a filling pipe and a filling receptacle are further provided. Therefore, the hydrogen tank device can be attached to the frame after the filling system consisting of the filling pipe and the filling receptacle is connected to the hydrogen tank in advance. This makes it easier to install the hydrogen tank device on the construction machine.

[0103] In a thirteenth aspect, the hydrogen tank device is a hydrogen tank device of any one of the first to eleventh aspects, further comprising a filling pipe connected to the hydrogen tank and a filling connector connected to a filling receptacle provided on the construction machine.

[0104] According to the above aspect, a filling pipe and a filling connector are further provided. Therefore, the hydrogen tank device can be attached to the frame after the filling system consisting of the filling pipe and filling connector is connected to the hydrogen tank in advance. This makes it easier to install the hydrogen tank device on the construction machine.

[0105] In a fourteenth aspect, the construction machine comprises a hydrogen tank device of any one of the first to thirteenth aspects, a fuel cell that generates electricity using hydrogen supplied from the hydrogen tank device, and an electric pump device that is driven by electricity supplied from the fuel cell.

[0106] According to the above aspect, a construction machine having the above-described functions can be realized.

[0107] In a fifteenth aspect, the construction machine comprises a hydrogen tank device including a plate-shaped frame body having a thickness in a first direction and extending in a second direction, and a plurality of hydrogen tanks extending in the second direction and attached to the frame body parallel to each other, and a frame having an upright portion extending upward, wherein the hydrogen tank device is attached to the frame so that the mounting surface on one side of the frame body in the first direction abuts against the upright portion.

[0108] According to the above aspect, the hydrogen tank device is attached to the frame so that the mounting surface on one side of the frame in the first direction abuts against the side surface of the frame. Therefore, multiple hydrogen tanks can be attached to the frame of the construction machine in a unitized state. This makes it easy to install hydrogen tanks in the construction machine.

[0109] From the above description, many modifications and other embodiments of the present disclosure will be apparent to those skilled in the art. Therefore, the above description should be construed as illustrative only and is provided for the purpose of teaching those skilled in the art the best mode for carrying out the present disclosure. Details of the structure and / or function thereof can be substantially changed without departing from the spirit of the present disclosure.

Claims

1. A hydrogen tank device comprising: a plate-shaped frame body that is formed in a rectangular shape when viewed from one side in a first direction; and a plurality of hydrogen tanks that extend in the longitudinal direction of the frame body and are attached to the frame body parallel to each other, wherein the frame body has a mounting surface on one side in the first direction that is attached to the frame of a construction machine.

2. A hydrogen tank device as described in claim 1, wherein the frame is attached to an upright portion of the frame that is arranged to stand up on the construction machine.

3. A hydrogen tank device as described in claim 1, wherein the frame body includes at least a plurality of hanging portions arranged at intervals from each other on one side in the short side direction.

4. A hydrogen tank device as described in claim 3, wherein each of the hanging parts is arranged so as to be located on an imaginary line passing through the center of gravity of the hydrogen tank device and extending in the short direction when viewed in the longitudinal direction.

5. A hydrogen tank device as described in claim 1, further comprising a plurality of mounting members each spaced apart in the longitudinal direction of the frame body, the plurality of hydrogen tanks being attached to the frame body via the plurality of mounting members and attached to the plurality of mounting members so as to protrude from the frame body in the other of the first direction.

6. A hydrogen tank device as described in claim 5, wherein the mounting members each hold one longitudinal end and the other longitudinal end of the hydrogen tank.

7. A hydrogen tank device as described in claim 5, wherein the mounting member has an installation section installed on each of both short side portions of the frame body, and a fixing section which fixes the hydrogen tank to the installation section, and the hydrogen tank is attached to the frame body by abutting its peripheral surface against the installation section and tightening with the fixing section.

8. A hydrogen tank device as described in claim 1, further comprising a supply system unit including a piping member connected to a tank valve provided at the mouth of each of the plurality of hydrogen tanks, a valve provided on the piping member, and a mounting plate to which the piping member and the valve are attached, the supply system unit being attached to the frame body.

9. A hydrogen tank device as described in claim 8, wherein the multiple hydrogen tanks are arranged on the frame so that the tank valve is located on one side in the longitudinal direction, and the supply system unit is attached to the frame so that it is located on one side of the hydrogen tank in the longitudinal direction.

10. A hydrogen tank device as described in claim 8, wherein the mounting plate is attached to the side of the frame opposite the mounting surface, and the piping members and the plurality of valves are attached to the main surface of the mounting plate on the other side in the first direction.

11. A hydrogen tank device comprising: a plate-shaped frame body having a thickness in a first direction and extending in a second direction; a plurality of hydrogen tanks extending in the second direction of the frame body and attached to the frame body parallel to each other; and a plurality of mounting members each provided on the frame body at intervals in the second direction, wherein the frame body has a mounting surface on one side in the first direction that is attached to a frame of a construction machine, and the plurality of hydrogen tanks are attached to the frame body by attaching the plurality of mounting members so that they protrude from the frame body in the other side of the first direction.

12. The hydrogen tank device as described in claim 1, further comprising: a filling pipe connected to said hydrogen tank; and a filling receptacle connected to said hydrogen tank via said filling pipe.

13. The hydrogen tank device as described in claim 1, further comprising: a filling pipe connected to the hydrogen tank; and a filling connector connected to a filling receptacle provided on the construction machine.

14. A construction machine comprising: the hydrogen tank device according to any one of claims 1 to 13; a fuel cell which generates electricity using hydrogen supplied from the hydrogen tank device; and an electric pump device which is driven by electricity supplied from the fuel cell.

15. A construction machine comprising: a hydrogen tank device including a plate-shaped frame body having a thickness in a first direction and extending in a second direction, and a plurality of hydrogen tanks extending in the second direction and parallel to each other and attached to the frame body; and a frame having an upright portion extending upward, wherein the hydrogen tank device is attached to the frame so that a mounting surface on one side of the frame body in the first direction abuts against the upright portion.

Images