Work vehicle

Abstract

The present invention provides a work vehicle in which a cooling device is disposed at an appropriate position.　The present invention comprises: a vehicle body (5); a hydrogen tank (21) which is provided in a front portion of the vehicle body (5) and which stores hydrogen; a fuel cell (22) which is provided on the vehicle body (5) and which generates electric power using hydrogen supplied from the hydrogen tank (21); equipment (EM) that receives the electric power generated by the fuel cell 22; a first cooling device (25) that cools the hydrogen tank (21) and / or the fuel cell (22); and a second cooling device (26) that cools the equipment (EM). The first cooling device (25) and / or the second cooling device (26) is disposed to the rear of the hydrogen tank (21) in the front-rear direction of the vehicle body (5).

Description

Work vehicle

[0001] The present invention relates to a work vehicle equipped with a fuel cell.

[0002] Conventionally, work vehicles such as tractors have been provided with a hydrogen tank for storing hydrogen, a fuel cell that generates electricity using the hydrogen supplied from the hydrogen tank, and a motor that is driven by the electricity generated by the fuel cell. By driving the motor, a traveling device and various devices are operated (see, for example, Patent Document 1). This type of work vehicle includes a cooling device for cooling at least one of the hydrogen tank and the fuel cell.

[0003] Japanese Patent Publication "JP-A-2024-95112"

[0004] By the way, in the work vehicle having the above configuration, due to the influence of the arrangement and occupancy rate of the hydrogen tank and the fuel cell on the vehicle body, the cooling device may not be arranged at an appropriate position.

[0005] Also, in the work vehicle having the above configuration, due to the influence of the occupancy rate of the hydrogen tank and the fuel cell on the vehicle body and the arrangement of the traveling device and the like that constitute the work vehicle, the cooling device may not be arranged at an appropriate position.

[0006] Furthermore, in the work vehicle having the above configuration, due to the influence of the arrangement and occupancy rate of the hydrogen tank and the fuel cell on the vehicle body, the cooling device may not be arranged at an appropriate position.

[0007] Therefore, a first object of the present invention is to provide a work vehicle in which the cooling device is arranged at an appropriate position.

[0008] Another object of the second invention of the present invention is to provide a work vehicle in which the cooling device is arranged at an appropriate position.

[0009] Furthermore, a third object of the present invention is to provide a work vehicle in which the cooling device is arranged at an appropriate position.

[0010] A work vehicle according to one aspect of the first invention of the present invention comprises a vehicle body, a hydrogen tank provided at the front of the vehicle body for storing hydrogen, a fuel cell provided on the vehicle body for generating electricity using hydrogen supplied from the hydrogen tank, equipment for receiving the electricity generated by the fuel cell, a first cooling device for cooling at least one of the hydrogen tank and the fuel cell, and a second cooling device for cooling the equipment, wherein at least one of the first cooling device and the second cooling device is positioned behind the hydrogen tank in the longitudinal direction of the vehicle body.

[0011] A work vehicle according to a second aspect of the present invention comprises a vehicle body, a pair of front running gears provided on both sides of the front of the vehicle body in the longitudinal direction, a pair of rear running gears provided on both sides of the rear of the vehicle body in the longitudinal direction, a hydrogen tank provided on the vehicle body for storing hydrogen, a fuel cell provided on the vehicle body for generating electricity using hydrogen supplied from the hydrogen tank, and a first cooling device for cooling at least one of the hydrogen tank and the fuel cell, wherein the first cooling device is positioned between the pair of rear running gears.

[0012] A work vehicle according to one aspect of the third invention of the present invention comprises a vehicle body, a front running gear supported by the vehicle body, a rear running gear supported by the vehicle body, a hydrogen tank for storing hydrogen, a fuel cell for generating electricity using hydrogen supplied from the hydrogen tank, equipment for receiving the electricity generated by the fuel cell, a first cooling device for cooling at least one of the hydrogen tank and the fuel cell, and a second cooling device for cooling the equipment, wherein the fuel cell is provided at the front of the vehicle body in the longitudinal direction, the hydrogen tank is provided at the rear of the vehicle body in the longitudinal direction, and at least one of the first cooling device and the second cooling device is provided in front of the hydrogen tank in the longitudinal direction of the vehicle body.

[0013] According to the first invention of the present invention, the cooling device is positioned in an appropriate location.

[0014] According to the second invention of the present invention, the cooling device is positioned in an appropriate location.

[0015] According to the third invention of the present invention, the cooling device is positioned in an appropriate location.

[0016] Figure 1 is a left side view of a work vehicle according to one embodiment of the present invention. Figure 2 is a front view of the work vehicle according to the same embodiment. Figure 3 is a rear view of the work vehicle according to the same embodiment. Figure 4 is a top view of the work vehicle according to the same embodiment. Figure 5 is a partial perspective view of the work vehicle according to the same embodiment, showing the support frame assembled to the vehicle body frame and gear case. Figure 6 is a partially exploded perspective view of the work vehicle according to the same embodiment, showing the support frame removed from the vehicle body frame and gear case. Figure 7 is a partial perspective view of the work vehicle according to the same embodiment, showing the vehicle body frame and gear case assembled. Figure 8 is a partial top view of the work vehicle according to the same embodiment, showing the vehicle body frame and gear case assembled. Figure 9 is a schematic perspective view of the first bonnet of the work vehicle according to the same embodiment. Figure 10 is a schematic perspective view of the second bonnet of the work vehicle according to the same embodiment, viewed from the right front. Figure 11 is a schematic perspective view of the second bonnet of the work vehicle according to the same embodiment, viewed from the left rear. Figure 12 is a schematic cross-sectional view of the energy storage device of the work vehicle according to the same embodiment. Figure 13 is a schematic exploded perspective view of the first cooling device of the work vehicle according to the same embodiment. Figure 14 is a schematic diagram of the circulation path including the first cooling device of the work vehicle according to the same embodiment. Figure 15 is a schematic exploded perspective view of the second cooling device of the work vehicle according to the same embodiment. Figure 16 is a schematic diagram of the circulation path including the second cooling device of the work vehicle according to the same embodiment. Figure 17 is a schematic block diagram of the control device of the work vehicle according to the same embodiment. Figure 18 is an overall perspective view of the support frame of the work vehicle according to the same embodiment. Figure 19 is a schematic plan view of the support frame of the work vehicle according to the same embodiment. Figure 20 is a left side view of the support frame of the work vehicle according to the same embodiment. Figure 21 is a left side view of a work vehicle according to another embodiment of the present invention. Figure 22 is a left side view of a work vehicle according to yet another embodiment of the present invention. Figure 23 is a left side view of a work vehicle according to yet another embodiment of the present invention. Figure 24 is a plan view of the work vehicle shown in Figure 23. Figure 25 is a left side view of a work vehicle according to yet another embodiment of the present invention. Figure 26 is a top view of the work vehicle shown in Figure 25. Figure 27 is a left side view of a work vehicle according to yet another embodiment of the present invention. Figure 28 is a top view of the work vehicle shown in Figure 27.Figure 29 is a left side view of a work vehicle according to yet another embodiment of the present invention. Figure 30 is a top view of the work vehicle shown in Figure 29. Figure 31 is a left side view of a work vehicle according to yet another embodiment of the present invention. Figure 32 is a top view of the work vehicle shown in Figure 31. Figure 33 is a left side view of a work vehicle according to one embodiment of the present invention. Figure 34 is a front view of the work vehicle according to the same embodiment. Figure 35 is a rear view of the work vehicle according to the same embodiment. Figure 36 is a top view of the work vehicle according to the same embodiment. Figure 37 is a partial perspective view of the work vehicle according to the same embodiment, showing the support frame assembled to the vehicle body frame and gear case. Figure 38 is a partially exploded perspective view of the work vehicle according to the same embodiment, showing the support frame removed from the vehicle body frame and gear case. Figure 39 is a partial perspective view of the work vehicle according to the same embodiment, showing the vehicle body frame and gear case assembled. Figure 40 is a partial plan view of the work vehicle of the same embodiment, showing the vehicle body frame and gear case assembled. Figure 41 is a schematic perspective view of the first bonnet of the work vehicle of the same embodiment. Figure 42 is a schematic perspective view of the second bonnet of the work vehicle of the same embodiment, viewed from the front right. Figure 43 is a schematic perspective view of the second bonnet of the work vehicle of the same embodiment, viewed from the rear left. Figure 44 is a schematic cross-sectional view of the energy storage device of the work vehicle of the same embodiment. Figure 45 is a schematic exploded perspective view of the first cooling device of the work vehicle of the same embodiment. Figure 46 is a schematic diagram of the circulation path including the first cooling device of the work vehicle of the same embodiment. Figure 47 is a schematic exploded perspective view of the second cooling device of the work vehicle of the same embodiment. Figure 48 is a schematic diagram of the circulation path including the second cooling device of the work vehicle of the same embodiment. Figure 49 is a schematic block diagram of the control device of the work vehicle of the same embodiment. Figure 50 is an overall perspective view of the support frame of the work vehicle of the same embodiment. Figure 51 is a schematic plan view of the support frame of the work vehicle of the same embodiment. Figure 52 is a left side view of the support frame of the work vehicle according to the same embodiment. Figure 53 is a left side view of a work vehicle according to another embodiment of the present invention. Figure 54 is a left side view of a work vehicle according to yet another embodiment of the present invention. Figure 55 is a left side view of a work vehicle according to yet another embodiment of the present invention. Figure 56 is a top view of the work vehicle shown in Figure 55.Figure 57 is a left side view of a work vehicle according to yet another embodiment of the present invention. Figure 58 is a top view of the work vehicle shown in Figure 57. Figure 59 is a left side view of a work vehicle according to yet another embodiment of the present invention. Figure 60 is a top view of the work vehicle shown in Figure 59. Figure 61 is a left side view of a work vehicle according to yet another embodiment of the present invention. Figure 62 is a top view of the work vehicle shown in Figure 61. Figure 63 is a left side view of a work vehicle according to yet another embodiment of the present invention. Figure 64 is a top view of the work vehicle shown in Figure 63. Figure 65 is a left side view of a work vehicle according to yet another embodiment of the present invention. Figure 66 is a top view of the work vehicle shown in Figure 65. Figure 67 is a left side view of a work vehicle according to yet another embodiment of the present invention. Figure 68 is a top view of the work vehicle shown in Figure 67.

[0017] Hereinafter, a work vehicle according to one embodiment of the first and second inventions of the present invention (hereinafter, this embodiment will be referred to as the first embodiment) will be described with reference to the drawings. The work vehicle of the first embodiment is drivable. Based on this premise, in the following description, the direction in which the work vehicle moves straight (forward and backward directions) will be referred to as the front-rear direction, and the direction perpendicular to the front-rear direction and the up-down direction will be referred to as the lateral direction. Furthermore, one side of the lateral direction, the right side when the work vehicle is facing the direction of forward movement, will be referred to as the right, and the other side of the lateral direction, the left side when the work vehicle is facing the direction of forward movement, will be referred to as the left.

[0018] As shown in Figures 1 to 4, the work vehicle 1 comprises a drivable vehicle body 2. The vehicle body 2 includes a vehicle body 5, a pair of front running devices 6F, 6F provided on both sides of the front of the vehicle body 5 in the longitudinal direction, and a pair of rear running devices 6R, 6R provided on both sides of the rear of the vehicle body 5 in the longitudinal direction.

[0019] In other words, the work vehicle 1 comprises a vehicle body 5, a pair of front running gears 6F, 6F provided on both sides of the front of the vehicle body 5 in the longitudinal direction, and a pair of rear running gears 6R, 6R provided on both sides of the rear of the vehicle body 5 in the longitudinal direction. The work vehicle 1 also comprises a first bonnet 3 and a second bonnet 4 positioned on the vehicle body 5 (vehicle body 2).

[0020] The work vehicle 1 of the first embodiment includes a hydrogen tank 21 for storing (containing) hydrogen and a fuel cell 22 that generates electricity using hydrogen supplied from the hydrogen tank 21. The work vehicle 1 also includes an energy storage device 24 for storing the electricity generated by the fuel cell 22 (see Figures 5 to 7). Furthermore, the work vehicle 1 of the first embodiment includes a cooling device 25 (hereinafter referred to as the first cooling device 25) for cooling at least one of the hydrogen tank 21 and the fuel cell 22. The work vehicle 1 also includes an equipment EM (hereinafter referred to as the equipped equipment EM) that receives the electricity generated by the fuel cell 22. Accordingly, the work vehicle 1 of the first embodiment includes a cooling device 26 (hereinafter referred to as the second cooling device 26) for cooling the equipped equipment EM.

[0021] The work vehicle 1 in the first embodiment is an agricultural tractor. Accordingly, the work vehicle 1 is equipped with an impulse support mechanism 7 capable of connecting and supporting a work impulse WE for performing a predetermined task (see Figure 1).

[0022] Furthermore, the work vehicle 1 of the first embodiment is an unmanned tractor that operates automatically according to a preset program, or is remotely operated by remote control. In the first embodiment, the work vehicle 1 is an unmanned tractor that is remotely operated by remote control. That is, the vehicle body 5 (vehicle main body 2) can be driven by commands from an external source. Accordingly, the work vehicle 1 is equipped with a control device 8 for driving and operating the work implement WE (see Figure 1). The work vehicle 1 is also equipped with sensing devices SE1 and SE2.

[0023] As shown in Figures 5 to 8, the vehicle body 5 includes a vehicle body frame 50 and a gear case 51 positioned in front of or behind the vehicle body frame 50. That is, the vehicle body 5 includes the vehicle body frame 50 and the gear case 51 arranged in the front-rear direction. In the vehicle body 5 of the first embodiment, the gear case 51 is positioned behind the vehicle body frame 50.

[0024] The vehicle frame 50 supports a pair of front running gears 6F, 6F (front wheels 60F, 60F, described later). In contrast, the gear case 51 supports a pair of rear running gears 6R, 6R (rear wheels 60R, 60R, described later).

[0025] To explain in more detail, as shown in Figures 6 to 8, the vehicle frame 50 and the gear case 51 are positioned with a gap between them in the front-rear direction. Accordingly, the vehicle body 5 includes a connecting member 55 that connects the vehicle frame 50 and the gear case 51. The connecting member 55 connects the vehicle frame 50 and the gear case 51 while creating a space between the vehicle frame 50 and the gear case 51 for arranging motors M1 and M2.

[0026] In the first embodiment, the vehicle body frame 50 has a pair of side walls 501, 501 that are spaced apart laterally and facing each other. Each of the pair of side walls 501, 501 is formed in a plate shape, stands upright in the vertical direction, and extends in the front-rear direction. That is, each of the pair of side walls 501, 501 is made of a rectangular plate material and is positioned with its longitudinal direction aligned with the front-rear direction of the vehicle body 5. The pair of side walls 501, 501 face each other with a spaced apart laterally.

[0027] The vehicle frame 50 (vehicle body 5) includes side wall connecting portions 502 and 503 that connect a pair of side walls 501, 501. The side wall connecting portions 502 and 503 extend laterally. In the first embodiment, the vehicle frame 50 (vehicle body 5) has a first side wall connecting portion 502 that connects the lower ends of a pair of side walls 501, 501 together, and a second side wall connecting portion 503 that connects the front ends (front ends in the front-rear direction) and rear ends (rear ends in the front-rear direction) of a pair of side walls 501, 501 together.

[0028] As will be described in more detail later, each of the pair of side walls 501, 501 is connected to a locking piece 504, 504 for locking the energy storage device 24.... The locking pieces 504, 504 extend laterally outward from the upper end of the connected side wall 501. In other words, the vehicle frame 50 is a pair of locking pieces 504, 504 connected to the upper ends of the pair of side walls 501, 501, and comprises a pair of locking pieces 504, 504 extending in directions away from each other.

[0029] The pair of locking pieces 504, 504 are provided in the area where the energy storage devices 24... are arranged. In the first embodiment, multiple energy storage devices 24... are arranged in a line in the front-to-back direction. Accordingly, the pair of locking pieces 504, 504 extend in the front-to-back direction along the side wall 501 to allow for the arrangement of multiple energy storage devices 24....

[0030] As described above, the vehicle frame 50 supports a pair of front running gears 6F, 6F as shown in Figure 5, and the gear case 51 supports a pair of rear running gears 6R, 6R. In the first embodiment, each of the pair of front running gears 6F, 6F includes a front wheel 60F that is rotatable around a laterally extending axis, and each of the pair of rear running gears 6R, 6R includes a rear wheel 60R that is rotatable around a laterally extending axis. In the first embodiment, the front wheel 60F and the rear wheel 60R are wheels 60F, 60R that roll in contact with the ground when the vehicle body 5 is running. More specifically, the front wheel 60F, 60F and the rear wheel 60R, 60R in the first embodiment are tire wheels that include a wheel and a tire mounted on the wheel. As mentioned above, with the adoption of tire wheels for the front wheels 60F, 60F and the rear wheels 60R, 60R, in the following explanation, the front wheels 60F of the front running gear 6F will be referred to as the front wheels, and the rear wheels 60R of the rear running gear 6R will be referred to as the rear wheels.

[0031] Accordingly, as shown in Figures 6 to 8, a steering device 52 for steering a pair of front wheels 60F, 60F is attached to the vehicle frame 50.

[0032] The steering device 52 includes a pair of steering knuckles 520, 520 that support the front wheels 60F, 60F so as to be rotatable around an axis extending perpendicular to the vertical direction, a steering mechanism (not shown) that causes the pair of steering knuckles 520, 520 to rotate in conjunction around an axis extending vertically, and a steering case 521 that houses the steering mechanism and supports the steering knuckles 520, 520.

[0033] In the first embodiment, the steering mechanism is a hydraulic mechanism. In the first embodiment, a drive shaft DS (see Figure 8) is connected to the steering device 52, and the rotational force of the drive shaft DS is distributed to both sides in the lateral direction, thereby rotating each of the pair of front wheels 60F, 60F. That is, the steering device 52 is equipped with a power distribution mechanism (not shown) (hereinafter referred to as the front wheel distribution mechanism) that converts rotation around an axis that may extend in the front-rear direction into rotation around an axis that extends in the lateral direction and transmits it to both sides in the lateral direction.

[0034] The front wheel distribution mechanism is a gear mechanism composed of multiple gears. The front wheel distribution mechanism has a pair of axles (hereinafter referred to as front axles 522, 522) that are spaced apart laterally and rotate around an axis extending laterally under the drive of the drive shaft DS. Accordingly, each of the pair of front wheels 60F, 60F is connected to the front wheel distribution mechanism (the pair of front axles 522, 522). The front wheel distribution mechanism is housed in the steering case 521, similar to the steering mechanism. As a result, in the work vehicle 1 of the first embodiment, the pair of front wheels 60F, 60F are steerable and drivable.

[0035] The steering case 521 is connected to the vehicle frame 50, and the pair of front axles 522, 522 and the pair of steering knuckles 520, 520 are positioned laterally on both sides of the vehicle body 5 (vehicle frame 50). Accordingly, the pair of front wheels 60F, 60F are also positioned laterally on both sides of the vehicle body 5 (vehicle frame 50). In other words, the work vehicle 1 (vehicle body 5) has a pair of front axles 522, 522 positioned on both sides of the vehicle body 5 in the lateral direction (left and right), to which wheels 60F (front wheels 60F) are connected, and the pair of front axles 522, 522 rotate around an axis extending laterally.

[0036] In the first embodiment, the work vehicle 1 is equipped with two motors M1 and M2. Of the two motors M1 and M2, one motor M1 (hereinafter referred to as the first motor M1) transmits power to at least one of the wheels 60F, 60R and the gear case 51. In the first embodiment, the first motor M1 transmits power to the gear case 51. Of the two motors M1 and M2, the other motor M2 (hereinafter referred to as the second motor M2) rotates the PTO shaft 20 (see Figure 3), which outputs power to drive the work impulse WE. The PTO shaft 20 is connected to the input shaft of the work impulse WE via a universal joint. In the first embodiment, the first motor M1 and the second motor M2 are arranged side by side in the lateral direction between the vehicle frame 50 and the gear case 51.

[0037] The gear case 51 houses a gear mechanism composed of multiple gears. The rotation of the output shaft of the first motor M1 is transmitted to the gear mechanism (not shown) inside the gear case 51. The gear mechanism distributes the rotational force of the first motor M1 to both sides in the lateral direction, driving each of the pair of rear wheels 60R, 60R to rotate. In other words, the gear mechanism inside the gear case 51 functions as a power distribution mechanism (hereinafter referred to as the rear wheel distribution mechanism) that converts rotation around an axis that may extend in the front-rear direction into rotation around an axis that extends in the lateral direction and transmits it to both sides in the lateral direction.

[0038] Specifically, the rear wheel distribution mechanism consists of a pair of axles (hereinafter referred to as rear axles 511, 511) which are output shafts spaced apart laterally, and which rotate around an axis extending laterally when driven by the first motor M1. Accordingly, each of the pair of rear wheels 60R, 60R is connected to the rear wheel distribution mechanism (the pair of rear axles 511, 511).

[0039] A pair of rear axles 511, 511 are positioned on both sides of the gear case 51 in the lateral direction. Accordingly, a pair of rear wheels 60R, 60R are also positioned on both sides of the vehicle body 5 (gear case 51) in the lateral direction. In other words, the work vehicle 1 (vehicle body 5) has a pair of rear axles 511, 511 positioned on both sides of the vehicle body 5 in the lateral direction (left and right) relative to a pair of front axles 522, 522, with wheels 60R (rear wheels 60R) connected to each, and a pair of rear axles 511, 511 that rotate around an axis extending in the lateral direction.

[0040] In the first embodiment, the rear wheel distribution mechanism has an output shaft that extends forward in the longitudinal direction, separate from the pair of rear axles 511, 511. A drive shaft DS extending in the longitudinal direction, which is connected to the front wheel distribution mechanism, is connected to the output shaft. As a result, the rear wheel distribution mechanism transmits the rotational force of the first motor M1 to the pair of rear wheels 60R, 60R, and also transmits the rotational force of the first motor M1 to the front wheels 60F, 60F (front wheel distribution mechanism) via the drive shaft DS. As a result, in the work vehicle 1 of the first embodiment, each of the pair of front wheels 60F, 60F and the pair of rear wheels 60R, 60R can be driven. In other words, the work vehicle 1 of the first embodiment is four-wheel drive.

[0041] As shown in Figures 1 and 4, the first bonnet 3 houses the hydrogen tank 21, and the second bonnet 4 houses the fuel cell 22 and the first cooling device 25. That is, the first bonnet 3 overlaps (covers) the hydrogen tank 21 located on the vehicle body 5 from above, and the second bonnet 4 overlaps (covers) the fuel cell 22, the first cooling device 25, and the second cooling device 26 located on the vehicle body 5 from above.

[0042] The first bonnet 3 and the second bonnet 4 are arranged according to the arrangement of the hydrogen tank 21, fuel cell 22, first cooling device 25, and second cooling device 26. In the first embodiment, the first bonnet 3 and the second bonnet 4 are aligned in the front-to-rear direction on the vehicle body 5. In the first embodiment, the second bonnet 4 is positioned rearward relative to the first bonnet 3.

[0043] The first bonnet 3 is disposed between a pair of front wheels 60F, 60F. In contrast, the second bonnet 4 is disposed between a pair of rear wheels 60R, 60R.

[0044] In the first embodiment, the work vehicle 1 includes a plurality of hydrogen tanks 21..., and the plurality of hydrogen tanks 21... are collectively held by a tank holder 23. Accordingly, the first bonnet 3 covers the entire tank holder 23, thereby covering the plurality of hydrogen tanks 21... held by the tank holder 23.

[0045] More specifically described, as shown in FIG. 9, the first bonnet 3 includes a front wall 30 (hereinafter referred to as the first front wall 30) positioned at the foremost in the front-rear direction, and a rear wall 31 (hereinafter referred to as the first rear wall 31) positioned on the rear side with respect to the first front wall 30. The first rear wall 31 faces the first front wall 30, and a pair of side walls 32, 32 (hereinafter referred to as the first side walls 32, 32) are arranged at intervals in the lateral direction and face each other. A pair of first side walls 32, 32 connect both ends of the first front wall 30 and both ends of the first rear wall 31. The first bonnet 3 further includes a top plate 33 (hereinafter referred to as the first top plate 33) connected to the upper ends of the first front wall 30, the first rear wall 31, and the pair of first side walls 32, 32. The first top plate 33 closes an opening defined by the upper ends of the first front wall 30, the first rear wall 31, and the pair of first side walls 32, 32.

[0046] The first front wall 30 and the first rear wall 31 are arranged at an interval wider than the entire length in the front-rear direction of the hydrogen tanks 21... (tank holder 23). In contrast, the pair of first side walls 32, 32 are set at an interval that can accommodate two hydrogen tanks 21... arranged side by side in the lateral direction. In the first embodiment, the pair of first side walls 32, 32 are arranged at an interval wider than the entire length in the lateral direction of the tank holder 23. Since the first bonnet 3 is disposed between a pair of front wheels 60F, 60F, the entire length in the lateral direction of the first bonnet 3 is set shorter than the interval between the pair of front wheels 60F, 60F. The vertical lengths (heights) of the first front wall 30, the first rear wall 31, and the first side walls 32, 32 are set longer (higher) than the entire length (height) of the tank holder 23 in the vertical direction.

[0047] The first bonnet 3 is supported by a support frame 9 (support plate 920) in a state of covering a hydrogen tank 21... (tank holder 23) on the support frame 9 (vehicle body 5).

[0048] The entire first bonnet 3 is openable and closable. Specifically, the entire first bonnet 3 is detachable from the vehicle body 5, and it is possible to switch between a state where the first bonnet 3 is removed to open the interior (on the vehicle body 5) and a state where the first bonnet 3 is attached to the vehicle body 5 to cover the interior (equipment such as the hydrogen tank 21... on the vehicle body 5).

[0049] As shown in FIG. 4, the second bonnet 4 is disposed between a pair of rear wheels 60R, 60R. That is, the second bonnet 4 is disposed between a pair of rear wheels 60R, 60R in a plan view. Note that the second bonnet 4 is disposed above the rear wheel 60R when viewed from the lateral direction. In the first embodiment, as shown in FIGS. 10 and 11, the second bonnet 4 has a ventilation port 44 for taking in outside air and exhausting hot air in order to cover the first cooling device 25 and the second cooling device 26.

[0050] More specifically described, the second bonnet 4 includes a front wall 40 (hereinafter referred to as the second front wall 40) located at the foremost position in the front-rear direction, and a rear wall 41 (hereinafter referred to as the second rear wall 41) located on the rear side with respect to the second front wall 40, the second rear wall 41 facing the second front wall 40, and a pair of side walls 42, 42 (hereinafter referred to as the second side walls 42, 42) disposed at intervals in the lateral direction and facing each other, the pair of second side walls 42, 42 connecting both ends of the second front wall 40 and both ends of the second rear wall 41, and a top plate 43 (hereinafter referred to as the second top plate 43) connected to the upper ends of the second front wall 40, the upper end of the second rear wall 41, and the upper ends of the pair of second side walls 42, 42, the second top plate 43 closing an opening defined by the upper ends of the second front wall 40, the upper end of the second rear wall 41, and the upper ends of the pair of second side walls 42, 42.

[0051] The second front wall 40 and the second rear wall 41 are disposed at an interval that allows the fuel cell 22 and the first cooling device 25 to be disposed. On the other hand, the pair of second side walls 42, 42 are set to be narrower than the interval (inner dimension) between the pair of rear wheels 60R, 60R.

[0052] In the second bonnet 4, the second front wall 40, the second rear wall 41, and the pair of second side walls 42, 42 constitute a peripheral wall surrounding the fuel cell 22 and the first cooling device 25. The second bonnet 4 is supported by the support frame 9 while covering the fuel cell 22 and the first cooling device 25 on the equipment placement section 906 as a whole. The second bonnet 4 is placed on the upper surface (second support surface S2) of the equipment placement section 906 while covering the equipment EM on the equipment placement section 906, and is fixed to the equipment placement section 906 with screws.

[0053] The peripheral wall of the second bonnet 4 is provided with ventilation openings 44 that connect the inside and outside. In the first embodiment, ventilation openings 44 are provided at multiple locations on the peripheral wall of the second bonnet 4 (second front wall 40, second rear wall 41, and a pair of second side walls 42, 42). A mesh is placed in each ventilation opening 44 to prevent foreign matter from entering the inside of the second bonnet 4.

[0054] The entire second bonnet 4 is openable and closable. Specifically, the entire second bonnet 4 is detachable from the vehicle body 5, and it is possible to switch between a state in which the second bonnet 4 is removed and the interior (on top of the vehicle body 5) is open, and a state in which the second bonnet 4 is attached to the vehicle body 5 and the interior (equipment EM on top of the vehicle body 5) is covered.

[0055] The hydrogen tank 21 is located at the front of the vehicle body 5 (the area on the front side in the longitudinal direction). In the first embodiment, the hydrogen tank 21 is located on the first support portion 90A, which will be described later, located on the front side in the longitudinal direction of the vehicle body 5. More specifically, the work vehicle 1 of the first embodiment is equipped with a plurality of hydrogen tanks 21... as shown in Figure 2. That is, the work vehicle 1 is equipped with two or more hydrogen tanks 21.... The work vehicle 1 of the first embodiment is equipped with four hydrogen tanks 21... in order to secure the total hydrogen storage capacity (storage amount). Each hydrogen tank 21... includes a cylindrical body portion 210 and a pair of end portions 211, 211 that close both ends of the body portion 210, as shown in Figure 1. Each hydrogen tank 21... has its longitudinal length in the direction in which the axis (centerline) of the body portion 210 extends. That is, the axial length of the hydrogen tank 21... is longer than the diameter of the body portion 210. In the first embodiment, each of the four hydrogen tanks 21... is positioned with its centerline in the front-to-back direction, and its centerlines are parallel or nearly parallel to each other. In the first embodiment, the multiple hydrogen tanks 21... are arranged in a multi-row, multi-column (matrix) configuration in a front view, as shown in Figure 2. In the first embodiment, the four hydrogen tanks 21... are arranged in a 2-row, 2-column configuration in a front view. That is, the four hydrogen tanks 21... are arranged in two rows vertically and two columns horizontally.

[0056] In the first embodiment, each of the four hydrogen tanks 21... is arranged such that the centerline of the body portion 210 extends in the front-rear direction. One end portion 211 of the hydrogen tank 21... is connected to piping that leads to the fuel cell 22. Specifically, an on / off valve is attached to one end portion 211. Piping that leads to the fuel cell 22 is connected to the on / off valve. This makes it possible to switch the supply and cessation of hydrogen from the hydrogen tanks 21... to the fuel cell 22 by opening and closing the on / off valve. That is, one end of the hydrogen tank 21 in the longitudinal direction (one end portion 211) is connected to piping for extracting hydrogen, which leads to the fuel cell 22. In the first embodiment, the fuel cell 22 is arranged adjacent to the hydrogen tank 21. Specifically, the fuel cell 22 is arranged on the rear side of the hydrogen tank 21.

[0057] The work vehicle 1 is equipped with a tank holder 23 for holding multiple hydrogen tanks 21... Specifically, the work vehicle 1 of the first embodiment has multiple (four) hydrogen tanks 21..., and therefore is equipped with a tank holder 23 for integrally holding these multiple hydrogen tanks 21.... The tank holder 23 is screw-fixed to the support frame 9. In the first embodiment, the hydrogen tanks 21... are arranged in a 2x2 configuration when viewed from the front, so the tank holder 23 holds the four hydrogen tanks 21... in a 2x2 configuration.

[0058] The fuel cell 22 is installed in the vehicle body 5. In the first embodiment, the fuel cell 22 is installed in the rear area of ​​the vehicle body 5 in the front-rear direction. That is, the fuel cell 22 is installed in the second support part 90B, described later, located on the rear side of the vehicle body 5 in the front-rear direction. The fuel cell 22 generates electricity by receiving hydrogen from the hydrogen tank 21... Accordingly, the fuel cell 22 is connected to the hydrogen tank 21 via piping as described above. That is, the work vehicle 1 is equipped with piping that connects the hydrogen tank 21 and the fuel cell 22. In the first embodiment, the fuel cell 22 can suppress the temperature rise during power generation by the flow of coolant. That is, the fuel cell 22 is liquid-cooled.

[0059] The energy storage device 24... is a rechargeable secondary battery. The energy storage device 24... in the first embodiment is a battery pack including a plurality of battery modules BM that are electrically connected in series, as shown in Figure 12. Each battery module BM includes a plurality of battery cells that are electrically connected in series. In the first embodiment, the work vehicle 1 is equipped with a plurality of energy storage devices 24... (battery packs), and the plurality of energy storage devices 24... (battery packs) are arranged along the centerline of the hydrogen tank 21... (the longitudinal direction in which the centerline of the body portion 210, described later, extends). That is, in the first embodiment, the plurality of energy storage devices 24... are arranged in a line in the front-rear direction, as shown in Figures 5 to 7. In the first embodiment, the hydrogen tank 21... is positioned above the vehicle body 5 with the centerline of the body portion 210 in the front-rear direction. Accordingly, the plurality of energy storage devices 24... (battery packs) are arranged in a line in the front-rear direction below the hydrogen tank 21....

[0060] In the first embodiment, all or part (in the first embodiment, part) of the energy storage devices 24... are arranged between a pair of side walls 501, 501. Accordingly, the multiple energy storage devices 24... are arranged below the hydrogen tank 21... and along the longitudinal direction of the hydrogen tank 21....

[0061] More specifically, in the first embodiment, the external shape of the multiple energy storage devices 24... (battery packs) is the same, and as shown in Figure 12, when viewed from the front or rear direction (front view), it exhibits a T-shape. Specifically, the energy storage device 24... is composed of three parts. That is, the energy storage device 24... has a first part 241, a second part 242, and a third part 243. The first part 241, the second part 242, and the third part 243 are formed by a casing 240 (battery case 240). In other words, the energy storage device 24... includes a casing 240 that constitutes the outer shell, and the casing 240 defines the first part 241, the second part 242, and the third part 243.

[0062] Each of the first part 241, the second part 242, and the third part 243 is formed in a box shape and, when viewed from the front or back, has a rectangular shape.

[0063] The outer dimensions of the first portion 241 in the lateral direction are set to be smaller than the distance (internal dimension) between the pair of side walls 501, 501. That is, the outer dimensions of the first portion 241 are set to be such that it can be inserted between the pair of side walls 501, 501. The lengths of the first portion 241, the second portion 242, and the third portion 243 in the front-rear direction are set to be the same, and both front-rear surfaces of the first portion 241, the second portion 242, and the third portion 243 are positioned on the same plane.

[0064] The second part 242 and the third part 243 are positioned on either side of the first part 241 in the lateral direction. That is, the second part 242 is positioned to the right of the first part 241, and the third part 243 is positioned to the left of the first part 241. The vertical length of the first part 241 is set to be longer than that of the second part 242 and the third part 243. In contrast, the vertical lengths of the second part 242 and the third part 243 are set to be the same or approximately the same.

[0065] In the first embodiment, the vertical length (height) of the first portion 241 is set to be more than twice the vertical length of the second portion 242 and the third portion 243. The upper surfaces of the first portion 241, the second portion 242, and the third portion 243 form the same plane. That is, the upper surfaces of the second portion 242 and the third portion 243 are positioned at the same height as the upper surface of the first portion 241. As a result, the casing 240 (energy storage device 24...) has a T-shape when viewed from the front. That is, approximately the lower half of the first portion 241 in the vertical direction protrudes downward from the lower surfaces of the second portion 242 and the third portion 243 on both sides in the horizontal direction.

[0066] As a result, the energy storage device 24… (casing 240) is such that the lower side of the first portion 241 (the portion that protrudes downward from the second portion 242 and the third portion 243) can be inserted into the vehicle frame 50 (between the pair of side walls 501, 501), and with the lower side of the first portion 241 (the portion that protrudes downward from the second portion 242 and the third portion 243) inserted into the vehicle frame 50 (between the pair of side walls 501, 501), the lower surfaces of the second portion 242 and the third portion 243 are locked to the upper ends of the pair of side walls 501, 501 (locking pieces 504, 504 in the first embodiment). Accordingly, the vertical length of the portion of the first portion 241 that protrudes downward from the second portion 242 (third portion 243) is set to be less than or equal to the vertical length of the side wall 501.

[0067] In the first embodiment, the first portion 241 houses a plurality of battery modules BM... The plurality of battery modules BM... are stacked vertically within the first portion 241.

[0068] In the first embodiment, the first portion 241 houses two battery module groups G arranged horizontally, each group consisting of multiple battery modules BM stacked vertically within the first portion 241.

[0069] The second section 242 houses electrical components 244, such as a monitoring unit for monitoring the battery module BM. The third section 243 forms an air passage for cooling air that cools the battery module BM, and a heat sink 245 is housed within this air passage. The air passage formed in the third section 243 extends in the front-rear direction, with one end open to the outside and the other end connected to an opening provided on either the front or rear surface of the first section 241. An exhaust pipe (not shown) is connected to the outside through the other opening provided on either the front or rear surface of the first section 241.

[0070] As a result, in the energy storage device 24…(battery pack) 24 of the first embodiment, the cooling air from the third part 243 flows into the first part 241 from either the front or rear surface of the first part 241, and then circulates within the first part 241 in the front-to-back direction, cooling the battery module BM inside the first part 241. The cooling air, heated by the heat generated by the battery module BM, is discharged to the outside from the other of the front or rear surface of the first part 241.

[0071] As described above, in the first embodiment of the energy storage device 24..., the first part 241 is housed within the vehicle frame 50 (between a pair of side walls 501, 501), and the second part 242 and the third part 243 are locked to a pair of locking pieces 504, 504.

[0072] Furthermore, the upper surface of the energy storage device 24... (second part 242) is set to be lower than the upper surface of the support frame 9, which will be described later, when the second part 242 is locked to the pair of locking pieces 504, 504. Multiple energy storage devices 24... are arranged in a line in the front-to-back direction.

[0073] Multiple energy storage devices 24... are electrically connected in series, and the terminals at the uppermost and lowermost ends of the current flow (positive and negative terminals) are electrically connected to the fuel cell 22 and the first motor M1. As a result, the energy storage devices 24... store the electricity generated by the fuel cell 22 and supply the stored electricity to the first motor M1. In the first embodiment, when the fuel cell 22 is generating electricity, the fuel cell 22 can also supply power to the first motor M1. That is, the first motor M1 rotates by receiving power from the fuel cell 22.

[0074] The work vehicle 1 of the first embodiment is equipped with a first cooling device 25. The first cooling device 25 is a ventilated cooling device. In the first embodiment, the first cooling device 25 is arranged so that the direction of the cooling air outlet is directed outward from the vehicle body 5. That is, the first cooling device 25 is arranged so that the hot air after heat exchange is discharged to the outside.

[0075] In the first embodiment, the first cooling device 25 is a forced heat exchange type radiator that exchanges heat between gas and liquid. As shown in Figure 13, the first cooling device 25 includes a heat exchanger 250 that exchanges heat between air, which is the cooling medium, and a liquid, which is the medium to be cooled, and a blower 251 that forcibly supplies air (cooling medium) to the heat exchanger 250.

[0076] The heat exchanger 250 includes a plurality of heat dissipation fins Fa... arranged at intervals, and a pipe Pa that penetrates the plurality of heat dissipation fins Fa... and through which a liquid (cooling medium) flows. Each of the plurality of heat dissipation fins Fa... is a thin metal plate (sheet) with high thermal conductivity, and is positioned facing the adjacent heat dissipation fins Fa.

[0077] Each of the multiple heat dissipation fins Fa... is formed in the shape of a strip (or rectangular strip), and is stacked with its longitudinal and transverse directions aligned, forming multiple ventilation passages in the stacking direction. Each of the multiple heat dissipation fins Fa... is a thin sheet (or foil) of a metal with high thermal conductivity, such as aluminum or copper. In the first embodiment, the multiple heat dissipation fins Fa... are stacked in a direction perpendicular to the vertical direction.

[0078] Multiple heat dissipation fins Fa constitute a heat dissipation fin group, forming an air passage between adjacent heat dissipation fins Fa, Fa in the stacking direction. In the heat exchanger 250 of the first embodiment, each of the multiple air passages allows air to pass through in the short direction of the heat dissipation fins Fa. As a result, in the heat exchanger 250 (first cooling device 25), one end of the heat dissipation fins Fa in the short direction of the heat dissipation fin group constitutes an intake section 250a for drawing in air, and the other end of the heat dissipation fins Fa in the short direction of the heat dissipation fin group constitutes an exhaust section 250b for expelling (discharging) air. That is, the heat dissipation fin group forms a surface at one end of the multiple heat dissipation fins Fa... in the short direction, and forms a surface at the other end of the multiple heat dissipation fins Fa... in the short direction. As a result, in the heat exchanger 250, one end of each of the multiple heat dissipation fins Fa... in the short direction constitutes an intake section 250a, and the other end of each of the multiple heat dissipation fins Fa... in the short direction constitutes an exhaust section 250b.

[0079] Pipe Pa is a metal pipe with high thermal conductivity. Pipe Pa is a metal tube with high thermal conductivity, and is made of, for example, aluminum or copper. Pipe Pa includes multiple straight pipe sections Pa1 that penetrate multiple heat dissipation fins Fa at multiple locations, and semi-circular bent pipe sections Pa2, each of which consists of multiple turn pipe sections Pa2 connecting two adjacent straight pipe sections Pa1, the ends of Pa1, etc., forming a curved flow path.

[0080] The blower 251 is an electric fan. Specifically, the blower 251 includes a blower blade that can rotate around a predetermined axis and an electric motor that rotates the blower blade, and blows air in the axial direction by the rotation of the blower blade. Accordingly, the blower 251 is positioned with the blower blade facing the heat exchanger 250. In the first embodiment, the blower 251 is positioned facing the exhaust section 250b of the heat exchanger 250. That is, the first cooling device 25 is a suction-type radiator (heat exchange device) that forcibly supplies air to the heat exchanger 250 by the blowing (intake) of the blower 251. In the first embodiment, a suction-type radiator is used for the first cooling device 25, but the first cooling device 25 may also be a push-type radiator.

[0081] In the first embodiment, the first cooling device 25 is supported by a second support section 90B (equipment arrangement section 906), which will be described later. As described above, the first cooling device 25 is a suction-type heat exchanger, and the blower 251 is positioned outside the heat exchanger 250. That is, in the first cooling device 25, the heat exchanger 250 is positioned inside the blower 251.

[0082] In the first embodiment, the fuel cell 22 is liquid-cooled, and overheating is prevented by circulating a coolant, which is the cooling medium. Furthermore, if a water jacket is attached to the outer circumference of the hydrogen tanks 21, overheating of the hydrogen tanks 21 is prevented by circulating the coolant, which is the cooling medium, through the water jacket.

[0083] Accordingly, as shown in Figure 14, the first cooling device 25 supplies a cooling liquid (for example, cooling water), which is the cooling medium, to the equipment to be cooled (fuel cell 22 in the first embodiment). That is, the first cooling device 25 is positioned on a circulation path CR1 that circulates the cooling medium, and the circulation path CR1 includes a circulation pump P, a liquid tank, and the equipment to be cooled (fuel cell 22 in the first embodiment) at intermediate positions. In other words, the pipe Pa of the first cooling device 25 is connected to the piping PB1 in the circulation path CR1. When multiple first cooling devices 25 are provided, the pipes Pa of multiple (two) first cooling devices 25 are connected in series or in parallel, and the circulation path CR1 is configured so that the cooling liquid, which is the cooling medium, passes through multiple first cooling devices 25 (heat exchangers 250) sequentially or simultaneously.

[0084] In the first cooling device 25 with the above configuration, the liquid, which is the heat exchange medium, is cooled by exchanging heat with the air between the heat dissipation fins Fa as it flows through the pipe Pa. Therefore, the first cooling device 25 prevents the fuel cell 22 from becoming overheated as the cooled medium (cooling liquid) is supplied to the fuel cell 22.

[0085] The work vehicle 1 of the first embodiment is equipped with the following as equipment EM: inverter EM1, converter EM2, junction box EM3, first motor M1, second motor M2, energy storage device 24, etc. Some of these equipment EM (EM1, EM2, EM3, M1, M2, 24) are liquid-cooled, but in the first embodiment, the inverter EM1, converter EM2, and junction box EM3, which are electrical components among these equipment EM, will be described as examples of liquid-cooled components. In the following description, the inverter EM1, converter EM2, and junction box EM3 will be collectively referred to as electrical components EM1, EM2, and EM3.

[0086] The second cooling device 26 is a ventilated cooling device. More specifically, the second cooling device 26 is a forced heat exchange type radiator that exchanges heat between gas and liquid. More specifically, as shown in Figure 15, the second cooling device 26 includes a heat exchanger 260 that exchanges heat between air, which is the cooling medium, and a liquid, which is the medium to be cooled, and a blower 261 that forcibly supplies air (cooling medium) to the heat exchanger 260. The heat exchanger 260 includes a plurality of heat dissipation fins Fb... arranged at intervals, and a pipe Pb that penetrates the plurality of heat dissipation fins Fb... and through which the liquid (medium to be cooled) flows. Each of the plurality of heat dissipation fins Fb... is a thin metal plate (sheet) with high thermal conductivity and is positioned facing the adjacent heat dissipation fins Fb.

[0087] Each of the multiple heat dissipation fins Fb... is formed in the shape of a strip (or rectangular strip), and is stacked with its longitudinal and transverse directions aligned, forming multiple air passages in the stacking direction. Each of the multiple heat dissipation fins Fb... is a thin sheet (or foil) of a metal with high thermal conductivity, such as aluminum or copper.

[0088] Multiple heat dissipation fins Fb... constitute a heat dissipation fin group, forming an air passage between adjacent heat dissipation fins Fb, Fb in the stacking direction. In the heat exchanger 260 of the first embodiment, each of the multiple air passages allows air to pass through in the short direction of the heat dissipation fins Fb. As a result, in the heat exchanger 260 (second cooling device 26), one end of the heat dissipation fins Fb in the heat dissipation fin group in the short direction constitutes an intake section 260a for drawing in air, and the other end of the heat dissipation fins Fb in the heat dissipation fin group in the short direction constitutes an exhaust section 260b for expelling (discharging) air. That is, the heat dissipation fin group forms a surface at one end of the multiple heat dissipation fins Fb... in the short direction, and forms a surface at the other end of the multiple heat dissipation fins Fb... in the short direction. As a result, in the heat exchanger 260, one end of the multiple heat dissipation fins Fb... in the short direction constitutes the intake section 260a, and the other end of the multiple heat dissipation fins Fb... in the short direction constitutes the exhaust section 260b.

[0089] Pipe Pb is a metal pipe with high thermal conductivity. Pipe Pb is a metal tube with high thermal conductivity, and is made of, for example, aluminum or copper. Pipe Pb includes multiple straight pipe sections Pb1 that penetrate multiple heat dissipation fins Fb at multiple locations, and multiple semicircular bent pipe sections Pb2, each of which connects the ends of two adjacent straight pipe sections Pb1, forming a curved flow path.

[0090] The blower 261 is an electric fan. Specifically, the blower 261 includes a blower blade that can rotate around a predetermined axis and an electric motor that rotates the blower blade, and blows air in the axial direction by the rotation of the blower blade. Accordingly, the blower 261 is positioned with the blower blade facing the heat exchanger 260. In the first embodiment, the blower 261 is positioned facing the exhaust section 260b of the heat exchanger 260. That is, the second cooling device 26 is a suction-type radiator (heat exchange device) that forcibly supplies air to the heat exchanger 260 by the blowing (intake) of the blower 261. In the first embodiment, a suction-type radiator is used for the second cooling device 26, but the second cooling device 26 may also be a push-type radiator.

[0091] In the first embodiment, multiple (two in the first embodiment) second cooling devices 26 are supported by the second support section 90B (equipment arrangement section 906), similar to the first cooling device 25. As described above, the second cooling device 26 is a suction-type heat exchanger, and the blower 261 is positioned outside the heat exchanger 260. That is, in the second cooling device 26, the heat exchanger 260 is positioned inside the blower 261.

[0092] In the first embodiment, the electrical components EM1, EM2, and EM3 of the equipped equipment EM are liquid-cooled, and by circulating water (coolant), which is the cooling medium, it is prevented that the electrical components EM1, EM2, and EM3 become overheated.

[0093] Accordingly, as shown in Figure 16, the second cooling device 26 supplies the cooling liquid, which is the cooling medium, to the equipment EM (electrical components EM1, EM2, and EM3 as described above) to be cooled. In other words, the second cooling device 26 is located on the circulation path CR2 that circulates the cooling medium, and the circulation path CR2 includes a circulation pump P, a liquid tank, and the electrical components EM1, EM2, and EM3 to be cooled at intermediate positions. Specifically, the pipe Pb of the second cooling device 26 is connected to the piping PB2 in the circulation path CR2.

[0094] In the second cooling device 26 configured as described above, the coolant, which is the heat exchange medium, is cooled by exchanging heat with additional air between the heat dissipation fins Fa as it flows through the pipe Pa. Therefore, the cooled coolant is supplied to the electrical components EM1, EM2, and EM3, and as a result, the second cooling device 26 prevents the electrical components EM1, EM2, and EM3 from becoming overheated. When multiple liquid-cooled electrical components EM1, EM2, and EM3 are provided, the multiple electrical components EM1, EM2, and EM3 are connected in series on the circulation path CR2, and the coolant flows sequentially through them, or a separate circulation path CR2 is provided for each electrical component EM1, EM2, and EM3. In the latter case, the second cooling device 26 is provided for each circulation path CR2. In the first embodiment, a single circulation path CR2 (second cooling device 26) cools multiple electrical components EM1, EM2, and EM3.

[0095] The first cooling device 25 and the second cooling device 26 are as described above, and at least one of the first cooling device 25 and the second cooling device 26 is positioned behind the hydrogen tank 21 in the longitudinal direction of the vehicle body 5. In the work vehicle 1 of the first embodiment, both the first cooling device 25 and the second cooling device 26 are positioned behind the hydrogen tank 21 in the longitudinal direction of the vehicle body 5. Also, at least one of the first cooling device 25 and the second cooling device 26 is positioned below the fuel cell 22. In the work vehicle 1 of the first embodiment, only the second cooling device 26 is positioned below the fuel cell 22. Furthermore, at least one of the first cooling device 25 and the second cooling device 26 is positioned between the hydrogen tank 21 and the fuel cell 22. The first cooling device 25 and the second cooling device 26 are positioned side by side in the vertical direction. As a result, in the work vehicle 1 of the first embodiment, in a plan view, the first cooling device 25 and the second cooling device 26 are positioned between the hydrogen tank 21 and the fuel cell 22.

[0096] The first cooling device 25 is positioned between the pair of rear running gears 6R, 6R. The second cooling device 26 is also positioned between the pair of rear running gears 6R, 6R.

[0097] Since the impulse support mechanism 7 is a well-known three-point linkage mechanism, its explanation is omitted here.

[0098] As described above, the control device 8 controls the vehicle's movement and other functions via communication (remote control), or performs so-called automatic driving control, which involves controlling the vehicle's movement and other functions based on pre-set information (programs).

[0099] As shown in Figure 17, the control device 8 comprises an arithmetic control unit 80, a storage unit 81 that stores information used in the processing of the arithmetic control unit 80, an input unit 82 that receives input signals (electrical signals) from at least a receiving device (transceiver: not shown) that receives signals from the outside, switches, sensing devices SE1, SE2 (described later), etc., and an output unit 83 that outputs control signals to the electric motor equipment to be controlled (first motor M1, second motor M2, actuator, etc.). Based on the input signals received from the input unit 82 and the information stored in the storage unit 81, the control device 8 generates control signals to control each part of the work vehicle 1 and outputs them to each part to be controlled.

[0100] The arithmetic control unit 80 is a CPU (EPU) and includes an arithmetic unit 800 and a control unit 801. In the control device 8 of the first embodiment, the storage unit 81 includes a first storage unit 810 that temporarily or short-term stores information used for processing by the arithmetic control unit 80 (arithmetic unit 800 and control unit 801), and a second storage unit 811 that long-term stores information used for processing by the arithmetic control unit 80 (arithmetic unit 800 and control unit 801). The first storage unit 810 is a so-called memory, and the second storage unit 811 is a storage device such as a hard disk or an SSD (Solid State Drive).

[0101] As shown in Figure 1, the hydrogen tank 21, fuel cell 22, first cooling device 25, and second cooling device 26 are installed on the vehicle body 5. That is, the hydrogen tank 21, fuel cell 22, first cooling device 25, and second cooling device 26 are directly or indirectly supported by the vehicle body 5.

[0102] The work vehicle 1 of the first embodiment is a support frame 9 connected to and supported by the vehicle body 5 (vehicle body frame 50 and gear case 51), and includes a support frame 9 that supports a hydrogen tank 21, a fuel cell 22, a first cooling device 25, and a second cooling device 26.

[0103] As shown in Figure 5, the support frame 9 is positioned on the vehicle body 5. The front end of the support frame 9 in the longitudinal direction is connected to the vehicle body frame 50, and the rear end of the support frame 9 in the longitudinal direction is connected to the gear case 51. The hydrogen tanks 21... and fuel cells 22 are positioned (mounted) on the support frame 9 directly or indirectly. In the first embodiment, as described above, the hydrogen tanks 21... are held by the tank holders 23 and are therefore positioned on the support frame 9 via the tank holders 23. In this way, the support frame 9 supports the hydrogen tanks 21... and fuel cells 22.

[0104] As shown in Figures 5 and 6, the support frame 9 is positioned at least between the front wheels 60F, 60F and the rear wheels 60R, 60R. The support frame 9 is provided extending from the front to the rear in the longitudinal direction of the vehicle body frame 50. In the first embodiment, the support frame 9 extends beyond the vehicle body frame 50 and extends from the front to the rear (over the entire length) of the vehicle body 5 in the longitudinal direction.

[0105] In the first embodiment, the front end of the support frame 9 in the front-rear direction is connected to the vehicle body frame 50, and the rear end of the support frame 9 in the front-rear direction is connected to the gear case 51.

[0106] More specifically, the support frame 9 is provided on the vehicle body 5, and the total length of the support frame 9 in the front-rear direction is set to be greater than or equal to the total length of the vehicle body 5 in the front-rear direction. As shown in Figures 18 to 20, the support frame 9 includes a first support section 90A that supports the hydrogen tanks 21... and a second support section 90B that supports at least the fuel cell 22 and the first cooling device 25. In the first embodiment, the second support section 90B supports the fuel cell 22 and the first cooling device 25, as well as the second cooling device 26. The second support section 90B also supports the electrical components EM1, EM2, and EM3 among the equipped equipment EM.

[0107] The first support portion 90A and the second support portion 90B are aligned in the front-rear direction. In the first embodiment, the second support portion 90B is located behind the first support portion 90A in the front-rear direction. Also in the first embodiment, the second support portion 90B is configured to support the fuel cell 22 and the first cooling device 25 above the support position of the hydrogen tank 21... by the first support portion 90A. Furthermore, the second support portion 90B is configured to support the second cooling device 26 below the first cooling device 25 (fuel cell 22). In addition, the second support portion 90B is configured to support the inverter EM1, converter EM2, and junction box EM3 among the equipped equipment EM below the first cooling device 25 (fuel cell 22).

[0108] More specifically, the support frame 9 includes a pair of first beam sections 900, 900 arranged at intervals in the lateral direction, the pair of first beam sections 900, 900 extending in the front-rear direction, and a plurality of second beam sections 901... arranged at intervals in the front-rear direction, each of which extends in the lateral direction and connects the pair of first beam sections 900, 900 to each other. The support frame 9 of the first embodiment includes a support plate 920 arranged on the first support section 90A, the support plate 920 whose upper surface constitutes a first support surface S1 on which hydrogen tanks 21... (tank holders 23) are arranged.

[0109] The support plate 920 is positioned across a pair of first beam sections 900, 900 and fixed to the upper surfaces of the pair of first beam sections 900. The support plate 920 is sized to accommodate the hydrogen tank 21 (tank holder 23). Specifically, in the first embodiment, the support plate 920 is formed in a rectangular shape in plan view. Assuming that the shorter side of the support plate 920 is positioned laterally, the length in the shorter side is set to be shorter than the distance between the pair of front wheels 60F, 60F. The length in the longitudinal side of the support plate 920 is set to be longer than the length in the front-rear direction of the hydrogen tank 21 (tank holder 23).

[0110] As shown in Figure 20, brackets 902, 903, and 904 for fixing to the vehicle body 5 are attached to the lower surface of the support frame 9 (each of the pair of first beam sections 900, 900). The brackets 902, 903, and 904 are positioned to overlap the vehicle body 5 (vehicle body frame 50) and are screw-fixed to the vehicle body 5. Specifically, the support frame 9 comprises a plurality of brackets 902, 903, and 904, which are arranged at intervals in the front-rear direction.

[0111] In the first embodiment, the support frame 9 includes a first bracket 902 attached to the front end, which overlaps the front end of the vehicle body frame 50, and a second bracket 903 attached to the rear end, which overlaps the gear case 51. The support frame 9 of the first embodiment also includes a third bracket 904 positioned between the first bracket 902 and the second bracket 903 in the front-rear direction, which overlaps the connecting member 55 located between the vehicle body frame 50 and the gear case 51.

[0112] The first bracket 902 is screw-fixed to the vehicle frame 50, and the second bracket 903 is screw-fixed to the gear case 51 (a support base 530 erected on the gear case 51 (see Figures 6 and 7)). The third bracket 904 is screw-fixed to the connecting member 55. The first bracket 902, the second bracket 903, and the third bracket 904 are set to a vertical height so that the support frame 9 is in a predetermined position (horizontal or nearly horizontal position with the work vehicle 1 positioned on a horizontal plane).

[0113] In the first embodiment, the hydrogen tanks 21... and the fuel cell 22 are arranged side by side in the front-to-back direction (see Figure 1). In the first embodiment, the hydrogen tanks 21... are positioned in front of the fuel cell 22. Accordingly, the front region of the support frame 9 is designated as the first support portion 90A that supports the hydrogen tanks 21..., and the rear region of the support frame 9 is designated as the second support portion 90B that supports the fuel cell 22, the first cooling device 25, and the second cooling device 26.

[0114] In the first embodiment, the support positions of the fuel cell 22 and the first cooling device 25 in the second support portion 90B (referred to as the second support surface S2) are set at a higher position than the support positions of the hydrogen tank 21... (tank holder 23) and the fuel cell 22 in the first support portion 90A (referred to as the first support surface S1).

[0115] More specifically, the second support section 90B includes a plurality of legs 905... erected on the first beam sections 900, 900, and an equipment placement section 906 including a first support surface S1 on which the fuel cell 22 and the like are placed, which is supported by the plurality of legs 905.... The plurality of legs 905... are arranged on the first beam sections 900, 900 at intervals in the front-rear direction. In the first embodiment, three legs 905, 905 are erected on each of the pair of first beam sections 900, 900 at intervals in the front-rear direction, providing a total of six legs 905....

[0116] The outer casing of the equipment placement section 906 is formed in a rectangular (approximately square) shape. In the first embodiment, the equipment placement section 906 is composed of a rectangular plate in plan view, and the upper surface of the equipment placement section 906 constitutes a second support surface S2 that supports the fuel cell 22 and the first cooling device 25. Of the six legs 905..., four legs 905... support the four corners of the equipment placement section 906. The second support surface S2 of the equipment placement section 906 is defined by a pair of horizontal edges extending in the lateral direction and spaced apart in the front-rear direction, and a pair of vertical edges extending in the front-rear direction and spaced apart in the lateral direction. In the first embodiment, the four corners of a rectangular frame member in plan view are supported by the legs 905..., and the equipment placement section 906 (plate) is fixed on the frame member.

[0117] Furthermore, the fuel cell 22 and the first cooling device 25 are arranged in the equipment arrangement section 906. As described above, since the equipment arrangement section 906 (second support surface S2) is supported by the leg section 905, a space (hereinafter referred to as the lower space SP) is formed below the equipment arrangement section 906 (between the gear case 51 and the equipment arrangement section 906). Accordingly, the second cooling device 26 is arranged in the lower space SP of the second support section 90B. The inverter EM1, converter EM2, and junction box EM3 are also arranged in the lower space SP. The second cooling device 26, inverter EM1, converter EM2, and junction box EM3 arranged in the lower space SP are connected and supported to the support frame 9 (first beam sections 900, 900, second beam section 901, or leg section 905) via brackets (not shown).

[0118] Specifically, the first cooling device 25 is positioned on the second support surface S2 along the lateral edge on the front side in the front-rear direction. Consequently, the fuel cell 22 is positioned behind the first cooling device 25 in the front-rear direction. As a result, the first cooling device 25 is positioned in front of the fuel cell 22. That is, on the second support portion 90B (second support surface S2) located behind the hydrogen tank 21, the first cooling device 25 is positioned in front of the fuel cell 22, and therefore the first cooling device 25 is positioned between the hydrogen tank 21 and the fuel cell 22.

[0119] Furthermore, since the second cooling device 26 is located in the lower space SP, it is positioned below the fuel cell 22. In the first embodiment, the second cooling device 26 is arranged vertically alongside the first cooling device 25. As a result, the first cooling device 25 and the second cooling device 26 are positioned between the hydrogen tank 21 and the fuel cell 22 in a plan view. Also, since the first cooling device 25 and the second cooling device 26 are positioned on the support frame 9 (second support portion 90B) located between the pair of rear running gears 6R, 6R, both the first cooling device 25 and the second cooling device 26 are positioned between the pair of rear running gears 6R, 6R (rear wheels 60R, 60R). The same applies to the equipment EM located in the lower space SP.

[0120] As shown in Figure 4, the sensing devices SE1 and SE2 are arranged at multiple locations (four locations in the first embodiment) on the front, rear, left, and right sides. This allows the sensing devices SE1 and SE2 to detect the conditions around the vehicle body 5. The work vehicle 1 of the first embodiment is equipped with multiple sensing devices SE1 and SE2. This allows the work vehicle 1 to recognize the conditions over a wide area around the vehicle body 5. The multiple sensing devices SE1 and SE2 are either cameras or lidar, or a combination of cameras and lidar. In the first embodiment, each of the multiple sensing devices SE1 and SE2 is the same camera. In the first embodiment, each of the multiple sensing devices SE1 and SE2 can be a wide-angle camera, a 360° camera, etc., and in the first embodiment, each of the multiple sensing devices SE1 and SE2 is a wide-angle camera.

[0121] Each of the multiple sensing devices SE1 and SE2 is positioned on the outside of the first bonnet 3 or the outside of the second bonnet 4. In the first embodiment, each of the multiple sensing devices SE1 and SE2 is attached to the upper surface (outer surface) of the first top plate 33 of the first bonnet 3 and the second top plate 43 of the second bonnet 4.

[0122] More specifically, the work vehicle 1 of the first embodiment is equipped with four sensing devices SE1 and SE2. One of the four sensing devices SE1 is mounted on the center of the width direction at the front end of the upper surface of the first top plate 33 of the first bonnet 3, and monitors the front of the vehicle body 5. In contrast, of the remaining three sensing devices SE2, two of them are mounted on both ends in the lateral direction of the upper surface of the second top plate 43 of the second bonnet 4, and monitor both sides of the vehicle body 5. The remaining sensing device SE2 is mounted on the center of the width direction at the rear end of the upper surface of the second top plate 43 of the second bonnet 4, and monitors the rear of the vehicle body 5.

[0123] In this way, since each of the multiple sensing devices SE1 and SE2 is mounted on the highest position (outer surface of the first top plate 33 and second top plate 43) of the first bonnet 3 and second bonnet 4 that constitute the exterior of the work vehicle 1, there is nothing in the surroundings that obstructs the sensing (detection) of the sensing devices SE1 and SE2, and the surroundings can be reliably detected (monitored). Furthermore, since the four sensing devices SE1, SE2, etc. are arranged in four locations on the front, rear, left, and right sides of the vehicle body 5, it becomes possible to monitor the entire surroundings of the vehicle body 5 (work vehicle 1).

[0124] The work vehicle 1 (agricultural tractor 1) of the first embodiment is as described above. Assuming that the hydrogen tank 21 and fuel cell 22 are arranged in the front-to-rear direction on the vehicle body 5, the first cooling device 25 and the second cooling device 26 are positioned behind the hydrogen tank 21 in the front-to-rear direction on the vehicle body 5. Therefore, the first cooling device 25 and the second cooling device 26 are positioned appropriately with respect to the arrangement of the front-to-rear hydrogen tank and fuel cell.

[0125] In particular, since the first cooling device 25 and the second cooling device 26 are positioned between the pair of rear running gears 6R, 6R, the first cooling device 25 and the second cooling device 26 are positioned appropriately without protruding beyond the width of the vehicle or interfering with the pair of rear running gears 6R, 6R.

[0126] Furthermore, since the first cooling device 25 is positioned between the hydrogen tank 21 and the fuel cell 22, the space between the hydrogen tank 21 and the fuel cell 22 can be effectively utilized.

[0127] Furthermore, since the first cooling device 25 and the second cooling device 26 are arranged side by side in the vertical direction, the overall size can be made more compact in the front-to-back direction compared to when the first cooling device 25 and the second cooling device 26 are arranged side by side in the front-to-back direction.

[0128] It should be noted that the present invention (the first and second inventions) is not limited to the first embodiment and can be modified as appropriate without departing from the spirit of the invention.

[0129] In the first embodiment, the front running gears 6F, 6F are equipped with front wheels 60F, 60F, which are tire wheels (front wheels), and the rear running gears 6R, 6R are equipped with rear wheels 60R, 60R, which are tire wheels (rear wheels), but the embodiment is not limited to this. For example, as shown in Figure 21, the work vehicle 1 may be a half-crawler type in which tire wheels are used for the front wheels 60F, 60F of the front running gears 6F, 6F, and crawler devices (endless track running gear) are used for the rear running gears 6R, 6R. In this case, the rear wheels 60R, 60R are the wheels furthest rear in the front-to-rear direction among the multiple wheels (sprockets (drive wheels), idlers (guide wheels)) around which the endless annular track belt (crawler belt) is wrapped. Conversely, a half-crawler type may be adopted in which tire wheels are used on the rear wheels 60R, 60R of the rear running gears 6R, 6R, and crawler devices (endless track running gear) are used on the front running gears 6F, 6F. In this case, among the multiple wheels (sprockets (drive wheels), idlers (guider wheels)) around which the endless annular track belt (crawler belt) is wrapped, the wheels furthest forward in the longitudinal direction become the front wheels 60F, 60F.

[0130] Furthermore, as shown in Figure 22, the work vehicle 1 may be a full crawler type in which the front wheels 60F, 60F and the rear wheels 60R, 60R are replaced with crawler devices positioned below the vehicle body 5. In other words, a crawler device that integrates the front running gear 6F and the rear running gear 6R may be adopted. In this case, among the multiple wheels (sprockets (drive wheels), idlers (guide wheels)), the wheels furthest forward in the longitudinal direction become the front wheels 60F, 60F, and the wheels furthest rear in the longitudinal direction become the rear wheels 60R, 60R.

[0131] In the first embodiment, the first cooling device 25 and the second cooling device 26 are arranged vertically, and in a plan view, the first cooling device 25 and the second cooling device 26 are positioned between the hydrogen tank 21 and the fuel cell 22, but the invention is not limited thereto. For example, in another embodiment of the present invention, as shown in Figures 23 and 24, the first cooling device 25 and the second cooling device 26 are arranged horizontally, and both the first cooling device 25 and the second cooling device 26 may be positioned between the hydrogen tank 21 and the fuel cell 22.

[0132] Furthermore, either the first cooling device 25 or the second cooling device 26 may be positioned at a location different from the space between the hydrogen tank 21 and the fuel cell 22, and the other of the first cooling device 25 or the second cooling device 26 may be positioned between the hydrogen tank 21 and the fuel cell 22. In other words, at least one of the first cooling device 25 and the second cooling device 26 may be positioned between the hydrogen tank 21 and the fuel cell 22.

[0133] In the first embodiment, both the first cooling device 25 and the second cooling device 26 are positioned behind the hydrogen tank 21 in the longitudinal direction of the vehicle body 5 and in front of the fuel cell 22 in the longitudinal direction, but the invention is not limited thereto. For example, in another embodiment of the present invention, as shown in Figures 25 and 26, one of the first cooling device 25 or the second cooling device 26 (the first cooling device 25 in the figures) may be positioned behind the hydrogen tank 21 in the longitudinal direction of the vehicle body 5 and behind the fuel cell 22 in the longitudinal direction. In this case, as shown in Figure 25, the other of the first cooling device 25 or the second cooling device 26 (the second cooling device 26 in the figures) may be positioned in a position that overlaps with the fuel cell 22 in the vertical or lateral direction (a position below the fuel cell 22), or it may be positioned between the hydrogen tank 21 and the fuel cell 22.

[0134] Furthermore, as shown in Figures 27 to 30, both the first cooling device 25 and the second cooling device 26 may be positioned behind the hydrogen tank 21 in the longitudinal direction of the vehicle body 5, and also behind the fuel cell 22 in the longitudinal direction. In this case, as shown in Figures 27 and 28, the first cooling device 25 and the second cooling device 26 may be positioned side by side in the vertical direction. Also, as shown in Figures 29 and 30, the first cooling device 25 and the second cooling device 26 may be positioned side by side in the longitudinal direction. In any case, the positions of the first cooling device 25 and the second cooling device 26 may, of course, be swapped.

[0135] Furthermore, the first cooling device 25 may be positioned in front of the fuel cell 22 in the longitudinal direction of the vehicle body 5, and the second cooling device 26 may be positioned behind the fuel cell 22 in the longitudinal direction of the vehicle body 5. In this embodiment, the positions of the first cooling device 25 and the second cooling device 26 may be swapped, with the second cooling device 26 positioned in front of the fuel cell 22 in the longitudinal direction of the vehicle body 5, and the first cooling device 25 positioned behind the fuel cell 22 in the longitudinal direction of the vehicle body 5. That is, at least one of the first cooling device 25 and the second cooling device 26 may be positioned behind the fuel cell 22 in the longitudinal direction of the vehicle body 5.

[0136] In the first embodiment, both the first cooling device 25 and the second cooling device 26 are positioned behind the hydrogen tank 21 in the longitudinal direction of the vehicle body 5, but the invention is not limited to this. For example, in yet another embodiment of the present invention, as shown in Figures 31 and 32, the first cooling device 25 may be positioned behind the hydrogen tank 21 in the longitudinal direction of the vehicle body 5, and the second cooling device 26 may be positioned in front of the hydrogen tank 21 in the longitudinal direction of the vehicle body 5. In this embodiment, the positions of the first cooling device 25 and the second cooling device 26 may be swapped, with the second cooling device 26 positioned behind the hydrogen tank 21 in the longitudinal direction of the vehicle body 5, and the first cooling device 25 positioned in front of the hydrogen tank 21 in the longitudinal direction of the vehicle body 5. That is, at least one of the first cooling device 25 and the second cooling device 26 may be positioned behind the hydrogen tank 21 in the longitudinal direction of the vehicle body 5.

[0137] In the first embodiment, only the second cooling device 26 was positioned below the fuel cell 22, but the invention is not limited to this. For example, in another aspect of the present invention, the positions of the first cooling device 25 and the second cooling device 26 may be swapped, and only the first cooling device 25 may be positioned below the fuel cell 22. Alternatively, both the first cooling device 25 and the second cooling device 26 may be positioned below the fuel cell 22 (positioned in the lower space SP). In other words, at least one of the first cooling device 25 and the second cooling device 26 may be positioned below the fuel cell 22.

[0138] In the first embodiment, both the first cooling device 25 and the second cooling device 26 are positioned between the pair of rear running gears 6R, 6R (rear wheels 60R, 60R (rear wheels 60R, 60R)), but are not limited thereto. For example, in another embodiment of the present invention, the second cooling device 26 may be positioned outside the pair of rear running gears 6R, 6R (rear wheels 60R, 60R (rear wheels 60R, 60R)), and only the first cooling device 25 may be positioned between the pair of rear running gears 6R, 6R (rear wheels 60R, 60R (rear wheels 60R, 60R)).

[0139] In the first embodiment, an agricultural tractor was described as an example of the work vehicle 1, but the work vehicle 1 is not limited to an agricultural tractor. For example, the work vehicle 1 may be a specialized machine such as a combine harvester or a multi-purpose work vehicle (utility vehicle: UV) other than a tractor. Furthermore, the work vehicle 1 may be a construction vehicle or a civil engineering vehicle.

[0140] In the first embodiment, a work vehicle 1 equipped with four hydrogen tanks 21, arranged vertically and horizontally (in two rows and two columns), was described, but the invention is not limited to this. For example, one or more hydrogen tanks 21 are sufficient. That is, the size and number of hydrogen tanks 21 should be determined according to the required hydrogen storage capacity.

[0141] In the first embodiment, the first bonnet 3 covered the hydrogen tank 21, and the second bonnet 4 covered the fuel cell 22, the first cooling device 25, and the second cooling device 26, but the embodiment is not limited to this. For example, as shown in Figures 31 and 32, if the second cooling device 26 is located at the front of the vehicle body 5 (forward side in the front-rear direction) and the first cooling device 25 is located at the rear of the vehicle body 5 (rear side in the front-rear direction), the first cooling device 25 and the second cooling device 26 are located at separate positions. This ensures that the first cooling device 25 and the second cooling device 26 are positioned appropriately. In other words, it prevents the first cooling device 25 and the second cooling device 26 from influencing each other's heat. In this case, the first bonnet 3 may also house the second cooling device 26 in addition to the hydrogen tank 21.

[0142] In the first embodiment, the upper end of the second support portion 90B of the support frame 9 (the second support surface S2 of the equipment placement portion 906) is set higher than the upper end of the first support portion 90A (the first support surface S1), but the embodiment is not limited to this. For example, the upper end of the first support portion 90A and the upper end of the second support portion 90B may be set at the same height. That is, the upper surface of the support plate 920 on the pair of first beam portions 900 (the first support surface S1) and the upper surface of the equipment placement portion 906 (the second support surface S2) may be a continuous surface (the same surface). That is, the support plate 920 and the equipment placement portion 906 may be made of a single plate (a common plate).

[0143] Furthermore, in the first embodiment, one first bonnet 3 and one second bonnet 4 are provided, but this is not limited to this. For example, two or more first bonnets 3 may be provided. Similarly, two or more second bonnets 4 may be provided. In other words, the arrangement and number of the first bonnets 3 and the second bonnets 4 may be appropriately changed according to the arrangement and number of equipment to be protected, and the sizes of the first bonnets 3 and the second bonnets 4 may also be appropriately changed according to the configuration they house.

[0144] In the first embodiment, cameras were used for the sensing devices SE1 and SE2, but the invention is not limited to this. For example, various types of sensors can be used for the sensing devices SE1 and SE2. For example, the sensing devices SE1 and SE2 may be lidar sensors, infrared sensors, temperature sensors (thermal sensors), etc. In other words, the sensing devices SE1 and SE2 should be equipped with sensors necessary to ensure safety in remote driving or autonomous driving (unmanned driving). Furthermore, the sensing devices SE1 and SE2 mounted on the work vehicle 1 are not limited to one type, but multiple types of sensors can be used and mounted on the work vehicle 1 (vehicle body 2 (vehicle 5)).

[0145] In the first embodiment, the work vehicle 1 is equipped with one first cooling device 25 and one second cooling device 26, but is not limited thereto. Each of the first cooling device 25 and the second cooling device 26 may be a single unit having a heat exchange capacity corresponding to the amount of heat generated by the equipment to be cooled, or the number of first cooling devices 25 may be set according to the amount of heat generated by the equipment to be cooled. However, the conditions for the arrangement of the first cooling device 25 and the second cooling device 26 are as described above.

[0146] In the first embodiment, the entirety of the first bonnet 3 and the entirety of the second bonnet 4 are configured to be openable and closable, but the invention is not limited to this. For example, the entirety of the first bonnet 3 may be configured to be openable and closable, and a part of the second bonnet 4 may be configured to be openable and closable. Alternatively, a part of the first bonnet 3 may be configured to be openable and closable, and the entirety of the second bonnet 4 may be configured to be openable and closable. Furthermore, a part of each of the first bonnet 3 and the second bonnet 4 may be configured to be openable and closable. In this case, when a part of the first bonnet 3 or the second bonnet 4 is configured to be openable and closable, the part of the first bonnet 3 or the second bonnet 4 is made into an openable and closable door.

[0147] This allows access to the interior of the first bonnet 3, enabling maintenance and inspection of equipment such as the hydrogen tank 21. Even when a portion of the second bonnet 4 can be opened and closed, it is still possible to access the interior of the second bonnet 4, enabling maintenance and inspection of the equipped equipment EM. With regard to the first bonnet 3, it is preferable to provide a sealing member around the door to suppress hydrogen leakage to the outside, so that the inside of the first bonnet 3 can be made airtight when closed.

[0148] In the first embodiment, examples of equipment EM to be cooled by the second cooling device 26 were given as an inverter EM1, a converter EM2, and a junction box EM3, which are electrical components, but the invention is not limited to these. That is, the equipment EM to be cooled by the second cooling device 26 can be any equipment that is assumed to be liquid-cooled, for example, a first motor M1, a second motor M2, a power storage device 24, etc. In this case as well, it goes without saying that the equipment EM is incorporated into the circulation path CR2 which includes the second cooling device 26.

[0149] Next, a work vehicle according to one embodiment of the third invention of the present invention (hereinafter referred to as the second embodiment) will be described with reference to the drawings. In the description of the second embodiment, components that are the same as or equivalent to those described in the first embodiment will be given the same reference numerals and names.

[0150] The work vehicle of the second embodiment is drivable. Based on this premise, in the following description, the direction in which the work vehicle moves straight (forward and backward) will be referred to as the longitudinal direction, and the direction perpendicular to the longitudinal and vertical directions will be referred to as the lateral direction. Furthermore, one side of the lateral direction, the right side when the work vehicle is facing the direction of forward movement, will be referred to as the right, and the other side of the lateral direction, the left side when the work vehicle is facing the direction of forward movement, will be referred to as the left.

[0151] As shown in Figures 33 to 36, the work vehicle 1 comprises a drivable vehicle body 2. The vehicle body 2 includes a vehicle body 5, a front running device 6F supported by the vehicle body 5, and a rear running device 6R supported by the vehicle body 5. More specifically, the vehicle body 2 includes a pair of front running devices 6F, 6F provided on both sides of the front of the vehicle body 5 in the longitudinal direction, and a pair of rear running devices 6R, 6R provided on both sides of the rear of the vehicle body 5 in the longitudinal direction.

[0152] Let me explain in more detail. The work vehicle 1 comprises a vehicle body 5, a front running gear 6F supported by the vehicle body 5, and a rear running gear 6R supported by the vehicle body 5. The front running gear 6F and the rear running gear 6R are arranged on both sides of the vehicle body 5 in the lateral direction. That is, the work vehicle 1 comprises a pair of front running gears 6F, 6F provided on both sides of the front of the vehicle body 5 in the longitudinal direction, and a pair of rear running gears 6R, 6R provided on both sides of the rear of the vehicle body 5 in the longitudinal direction. The work vehicle 1 comprises a first bonnet 3 and a second bonnet 4 arranged on the vehicle body 5 (vehicle body 2).

[0153] The work vehicle 1 of the second embodiment includes a hydrogen tank 21 for storing (containing) hydrogen and a fuel cell 22 that generates electricity using hydrogen supplied from the hydrogen tank 21. The work vehicle 1 also includes an energy storage device 24 for storing the electricity generated by the fuel cell 22 (see Figures 38 and 39). Furthermore, the work vehicle 1 of the second embodiment includes a cooling device 25 (hereinafter referred to as the first cooling device 25) for cooling at least one of the hydrogen tank 21 and the fuel cell 22. The work vehicle 1 also includes equipment EM (hereinafter referred to as the equipped equipment EM) for receiving the electricity generated by the fuel cell 22. Accordingly, the work vehicle 1 of the second embodiment includes a cooling device 26 (hereinafter referred to as the second cooling device 26) for cooling the equipped equipment EM.

[0154] The work vehicle 1 in the second embodiment is an agricultural tractor. Accordingly, the work vehicle 1 is equipped with an impulse support mechanism 7 capable of connecting and supporting a work impulse WE for performing a predetermined task (see Figure 33).

[0155] Furthermore, the work vehicle 1 of the second embodiment is an unmanned tractor that operates automatically according to a preset program, or is remotely operated by remote control. In the second embodiment, the work vehicle 1 is an unmanned tractor that is remotely operated by remote control. That is, the work vehicle 1 (vehicle body 2) can be driven by commands from an external source. Accordingly, the work vehicle 1 is equipped with a control device 8 for driving and operating the work implement WE (see Figure 33). The work vehicle 1 is also equipped with sensing devices SE1 and SE2 for monitoring the surroundings of the work vehicle 1.

[0156] As shown in Figures 37 to 40, the vehicle body 5 includes a vehicle body frame 50 and a gear case 51 positioned in front of or behind the vehicle body frame 50. That is, the vehicle body 5 includes the vehicle body frame 50 and the gear case 51 arranged in the front-rear direction. In the vehicle body 5 of the second embodiment, the gear case 51 is positioned behind the vehicle body frame 50.

[0157] The vehicle frame 50 supports a pair of front running gears 6F, 6F (front wheels 60F, 60F, described later). In contrast, the gear case 51 supports a pair of rear running gears 6R, 6R (rear wheels 60R, 60R, described later).

[0158] To explain in more detail, as shown in Figures 38 to 40, the vehicle frame 50 and the gear case 51 are positioned with a gap between them in the front-rear direction. Accordingly, the vehicle body 5 includes a connecting member 55 that connects the vehicle frame 50 and the gear case 51. The connecting member 55 connects the vehicle frame 50 and the gear case 51 while creating a space between the vehicle frame 50 and the gear case 51 for arranging motors M1 and M2.

[0159] In the second embodiment, the vehicle body frame 50 has a pair of side walls 501, 501 that are spaced apart laterally and facing each other. Each of the pair of side walls 501, 501 is formed in a plate shape, stands upright in the vertical direction, and extends in the front-rear direction. That is, each of the pair of side walls 501, 501 is made of a rectangular plate material and is positioned with its longitudinal direction aligned with the front-rear direction of the vehicle body 5. The pair of side walls 501, 501 face each other laterally, spaced apart.

[0160] The vehicle frame 50 (vehicle body 5) includes side wall connecting portions 502 and 503 that connect a pair of side walls 501, 501. The side wall connecting portions 502 and 503 extend laterally. In the second embodiment, the vehicle frame 50 (vehicle body 5) has a first side wall connecting portion 502 that connects the lower ends of a pair of side walls 501, 501 together, and a second side wall connecting portion 503 that connects the front ends (front ends in the front-rear direction) and rear ends (rear ends in the front-rear direction) of a pair of side walls 501, 501 together.

[0161] As will be described in more detail later, each of the pair of side walls 501, 501 is connected to a locking piece 504, 504 for locking the energy storage device 24.... The locking pieces 504, 504 extend laterally outward from the upper end of the connected side wall 501. In other words, the vehicle frame 50 is a pair of locking pieces 504, 504 connected to the upper ends of the pair of side walls 501, 501, and comprises a pair of locking pieces 504, 504 extending in directions away from each other.

[0162] The pair of locking pieces 504, 504 are provided in the area where the energy storage devices 24... are arranged. In the second embodiment, multiple energy storage devices 24... are arranged in a row in the front-to-back direction. Accordingly, the pair of locking pieces 504, 504 extend in the front-to-back direction along the side wall 501 to allow for the arrangement of multiple energy storage devices 24....

[0163] As described above, the vehicle frame 50 supports a pair of front running gears 6F, 6F as shown in Figure 37, and the gear case 51 supports a pair of rear running gears 6R, 6R. In the second embodiment, each of the pair of front running gears 6F, 6F includes a front wheel 60F that is rotatable around a laterally extending axis, and each of the pair of rear running gears 6R, 6R includes a rear wheel 60R that is rotatable around a laterally extending axis. In the second embodiment, the front wheel 60F and the rear wheel 60R are wheels 60F, 60R that roll in contact with the ground when the vehicle body 5 is running. More specifically, the front wheel 60F, 60F and the rear wheel 60R, 60R of the second embodiment are tire wheels that include a wheel and a tire mounted on the wheel. As mentioned above, with the adoption of tire wheels for the front wheels 60F, 60F and the rear wheels 60R, 60R, in the following explanation, the front wheels 60F of the front running gear 6F will be referred to as the front wheels, and the rear wheels 60R of the rear running gear 6R will be referred to as the rear wheels.

[0164] Accordingly, as shown in Figures 38 to 40, a steering device 52 for steering a pair of front wheels 60F, 60F is attached to the vehicle frame 50.

[0165] The steering device 52 includes a pair of steering knuckles 520, 520 that support the front wheels 60F, 60F so as to be rotatable around an axis extending perpendicular to the vertical direction, a steering mechanism (not shown) that causes the pair of steering knuckles 520, 520 to rotate in conjunction around an axis extending vertically, and a steering case 521 that houses the steering mechanism and supports the steering knuckles 520, 520.

[0166] In the second embodiment, the steering mechanism is a hydraulic mechanism. In the second embodiment, a drive shaft DS (see Figure 40) is connected to the steering device 52, and the rotational force of the drive shaft DS is distributed to both sides in the lateral direction, thereby rotating each of the pair of front wheels 60F, 60F. That is, the steering device 52 is equipped with a power distribution mechanism (not shown) (hereinafter referred to as the front wheel distribution mechanism) that converts rotation around an axis that may extend in the front-rear direction into rotation around an axis that extends in the lateral direction and transmits it to both sides in the lateral direction.

[0167] The front wheel distribution mechanism is a gear mechanism composed of multiple gears. The front wheel distribution mechanism has a pair of axles (hereinafter referred to as front axles 522, 522) that are spaced apart laterally and rotate around an axis extending laterally under the drive of the drive shaft DS. Accordingly, each of the pair of front wheels 60F, 60F is connected to the front wheel distribution mechanism (the pair of front axles 522, 522). The front wheel distribution mechanism is housed in the steering case 521, similar to the steering mechanism. As a result, in the work vehicle 1 of the second embodiment, the pair of front wheels 60F, 60F are steerable and drivable.

[0168] The steering case 521 is connected to the vehicle frame 50, and the pair of front axles 522, 522 and the pair of steering knuckles 520, 520 are positioned laterally on both sides of the vehicle body 5 (vehicle frame 50). Accordingly, the pair of front wheels 60F, 60F are also positioned laterally on both sides of the vehicle body 5 (vehicle frame 50). In other words, the work vehicle 1 (vehicle body 5) has a pair of front axles 522, 522 positioned on both sides of the vehicle body 5 in the lateral direction (left and right), to which wheels 60F (front wheels 60F) are connected, and the pair of front axles 522, 522 rotate around an axis extending laterally.

[0169] In the second embodiment, the work vehicle 1 is equipped with two motors M1 and M2. Of the two motors M1 and M2, one motor M1 (hereinafter referred to as the first motor M1) transmits power to at least one of the wheels 60F, 60R and the gear case 51. In the second embodiment, the first motor M1 transmits power to the gear case 51. In contrast, the other motor M2 (hereinafter referred to as the second motor M2) rotates the PTO shaft 20 (see Figure 35) which outputs power to drive the work impulse WE. The PTO shaft 20 is connected to the input shaft of the work impulse WE via a universal joint. In the second embodiment, the first motor M1 and the second motor M2 are arranged side by side in the lateral direction between the vehicle frame 50 and the gear case 51.

[0170] The gear case 51 houses a gear mechanism composed of multiple gears. The rotation of the output shaft of the first motor M1 is transmitted to the gear mechanism (not shown) inside the gear case 51. The gear mechanism distributes the rotational force of the first motor M1 to both sides in the lateral direction, driving each of the pair of rear wheels 60R, 60R to rotate. In other words, the gear mechanism inside the gear case 51 functions as a power distribution mechanism (hereinafter referred to as the rear wheel distribution mechanism) that converts rotation around an axis that may extend in the front-rear direction into rotation around an axis that extends in the lateral direction and transmits it to both sides in the lateral direction.

[0171] Specifically, the rear wheel distribution mechanism consists of a pair of axles (hereinafter referred to as rear axles 511, 511) which are output shafts spaced apart laterally, and which rotate around an axis extending laterally when driven by the first motor M1. Accordingly, each of the pair of rear wheels 60R, 60R is connected to the rear wheel distribution mechanism (the pair of rear axles 511, 511).

[0172] A pair of rear axles 511, 511 are positioned on both sides of the gear case 51 in the lateral direction. Accordingly, a pair of rear wheels 60R, 60R are also positioned on both sides of the vehicle body 5 (gear case 51) in the lateral direction. In other words, the work vehicle 1 (vehicle body 5) has a pair of rear axles 511, 511 positioned on both sides of the vehicle body 5 in the lateral direction (left and right) relative to a pair of front axles 522, 522, with wheels 60R (rear wheels 60R) connected to each, and a pair of rear axles 511, 511 that rotate around an axis extending in the lateral direction.

[0173] In the second embodiment, the rear wheel distribution mechanism has an output shaft that extends forward in the longitudinal direction, separate from the pair of rear axles 511, 511. A drive shaft DS extending in the longitudinal direction, which is connected to the front wheel distribution mechanism, is connected to the output shaft. The rear wheel distribution mechanism transmits the rotational force of the first motor M1 to the pair of rear wheels 60R, 60R, and also transmits the rotational force of the first motor M1 to the front wheels 60F, 60F (front wheel distribution mechanism) via the drive shaft DS. As a result, in the work vehicle 1 of the second embodiment, each of the pair of front wheels 60F, 60F and the pair of rear wheels 60R, 60R can be driven. In other words, the work vehicle 1 of the second embodiment is four-wheel drive.

[0174] As shown in Figures 33 and 36, the first bonnet 3 houses the hydrogen tank 21. That is, the first bonnet 3 overlaps (covers) the hydrogen tank 21, which is located on the vehicle body 5, from above. In contrast, the second bonnet 4 houses the fuel cell 22 and the first cooling device 25. In the second embodiment, the second cooling device 26 is positioned so as to overlap the first cooling device 25 in the vertical direction. Accordingly, the second bonnet 4 overlaps (covers) the fuel cell 22, the first cooling device 25, and the second cooling device 26 from above.

[0175] The first bonnet 3 and the second bonnet 4 are arranged according to the arrangement of the hydrogen tank 21, fuel cell 22, first cooling device 25, and second cooling device 26. In the second embodiment, the first bonnet 3 and the second bonnet 4 are aligned in the front-to-rear direction on the vehicle body 5. In the second embodiment, the second bonnet 4 is positioned in front of the first bonnet 3.

[0176] A portion of the first bonnet 3 is located between the pair of rear wheels 60R, 60R. In contrast, a portion of the second bonnet 4 is located between the pair of front wheels 60F, 60F.

[0177] In the second embodiment, the work vehicle 1 is equipped with a plurality of hydrogen tanks 21... The plurality of hydrogen tanks 21... are held together by a tank holder 23. Accordingly, the first bonnet 3 covers the entire tank holder 23, thereby also covering the plurality of hydrogen tanks 21... held by the tank holder 23.

[0178] More specifically, as shown in Figure 41, the first bonnet 3 consists of a front wall 30 located at the very front in the front-rear direction (hereinafter referred to as the first front wall 30), a rear wall 31 located behind the first front wall 30 (hereinafter referred to as the first rear wall 31), the first rear wall 31 facing the first front wall 30, and a pair of side walls 32, 32 (hereinafter referred to as the first side walls 32, 32) spaced apart in the lateral direction and facing each other. The structure includes a pair of first side walls 32, 32 connecting both ends of the first front wall 30 and both ends of the first rear wall 31, and a top plate 33 (hereinafter referred to as the first top plate 33) connected to the upper end of the first front wall 30, the upper end of the first rear wall 31, and the upper ends of the pair of first side walls 32, 32, which closes the opening defined by the upper end of the first front wall 30, the upper end of the first rear wall 31, and the upper ends of the pair of first side walls 32, 32.

[0179] The first front wall 30 and the first rear wall 31 are spaced further apart than the total length of the hydrogen tank 21... (tank holder 23) in the front-rear direction. In contrast, the pair of first side walls 32, 32 are spaced further apart to allow for the placement of two hydrogen tanks 21... side-by-side in the lateral direction. In the second embodiment, the pair of first side walls 32, 32 are spaced further apart than the total length of the tank holder 23 in the lateral direction. Since the first bonnet 3 is positioned between the pair of rear wheels 60R, 60R, the total length of the first bonnet 3 in the lateral direction is set to be shorter than the distance between the pair of rear wheels 60R, 60R. The vertical lengths (heights) of the first front wall 30, the first rear wall 31, and the first side walls 32, 32 are set to be longer (higher) than the total length (height) of the tank holder 23 in the vertical direction.

[0180] The first bonnet 3 is supported by the support frame 9 (support plate 920, described later) while covering the hydrogen tanks 21... (tank holders 23) on the support frame 9 (vehicle body 5).

[0181] The entire first bonnet 3 is openable and closable. Specifically, the entire first bonnet 3 is detachable from the vehicle body 5, and it is possible to switch between a state in which the first bonnet 3 is removed and the interior (on top of the vehicle body 5) is open, and a state in which the first bonnet 3 is attached to the vehicle body 5 and the interior (equipment on top of the vehicle body 5, such as the hydrogen tank 21, etc.) is covered.

[0182] As shown in Figure 36, a portion of the second bonnet 4 is positioned between the pair of front wheels 60F, 60F. That is, in a plan view, a portion of the second bonnet 4 is located between the pair of front wheels 60F, 60F. The second bonnet 4 is positioned above the front wheels 60F when viewed from the side. In the second embodiment, as shown in Figures 42 and 43, the second bonnet 4 has vents 44 for taking in outside air and expelling hot air from inside.

[0183] More specifically, the second bonnet 4 consists of a front wall 40 located at the very front in the front-rear direction (hereinafter referred to as the second front wall 40), a rear wall 41 located behind the second front wall 40 (hereinafter referred to as the second rear wall 41), the second rear wall 41 facing the second front wall 40, and a pair of side walls 42, 42 (hereinafter referred to as the second side walls 42, 42) arranged with a gap between them in the lateral direction and facing each other. The structure includes a pair of second side walls 42, 42 connecting both ends of the second front wall 40 and both ends of the second rear wall 41, and a top plate 43 (hereinafter referred to as the second top plate 43) connected to the upper end of the second front wall 40, the upper end of the second rear wall 41, and the upper ends of the pair of second side walls 42, 42, which closes the opening defined by the upper end of the second front wall 40, the upper end of the second rear wall 41, and the upper ends of the pair of second side walls 42, 42.

[0184] The second front wall 40 and the second rear wall 41 are positioned at an interval that allows for the placement of the fuel cell 22 and the first cooling device 25. In contrast, the pair of second side walls 42, 42 are set to be narrower than the distance (internal dimension) between the pair of front wheels 60F, 60F.

[0185] In the second bonnet 4, the second front wall 40, the second rear wall 41, and the pair of second side walls 42, 42 constitute a peripheral wall surrounding the fuel cell 22 and the first cooling device 25. The second bonnet 4 is supported by the support frame 9, with the fuel cell 22 and the first cooling device 25 covered together. The second bonnet 4 is also screw-fixed to the support frame 9.

[0186] The peripheral wall of the second bonnet 4 is provided with ventilation openings 44 that connect the inside and outside. In the second embodiment, multiple ventilation openings 44 are provided at various locations on the peripheral wall of the second bonnet 4. Specifically, the ventilation openings 44 are provided in the second front wall 40, the second rear wall 41, and the pair of second side walls 42, 42. A mesh is placed in each ventilation opening 44 to prevent foreign matter from entering the inside of the second bonnet 4.

[0187] The entire second bonnet 4 is openable and closable. Specifically, the entire second bonnet 4 is detachable from the vehicle body 5, and it is possible to switch between a state in which the second bonnet 4 is removed and the interior (on top of the vehicle body 5) is open, and a state in which the second bonnet 4 is attached to the vehicle body 5 and the interior (equipment EM on top of the vehicle body 5) is covered.

[0188] The hydrogen tank 21 is located at the rear of the vehicle body 5 (the rearward region in the front-rear direction). In the second embodiment, the hydrogen tank 21 is located on the first support portion 90A, which will be described later, located on the rearward side of the vehicle body 5 in the front-rear direction. More specifically, the work vehicle 1 of the second embodiment is equipped with a plurality of hydrogen tanks 21... as shown in Figure 35. That is, the work vehicle 1 is equipped with two or more hydrogen tanks 21... The work vehicle 1 of the second embodiment is equipped with four hydrogen tanks 21... in order to secure the total amount of hydrogen that can be stored for power generation by the fuel cell 22.

[0189] Each hydrogen tank 21... includes a cylindrical body 210 and a pair of end caps 211, 211 that close both ends of the body 210, as shown in Figure 33. Each hydrogen tank 21... has its longitudinal side in the direction in which the axis (centerline) of the body 210 extends. That is, the axial length of the hydrogen tank 21... is longer than the diameter of the body 210. In the second embodiment, each of the multiple (four) hydrogen tanks 21... is positioned with its centerline in the front-to-back direction, and its centerlines are parallel or substantially parallel to each other. In the second embodiment, the multiple hydrogen tanks 21... are arranged in a multi-row, multi-column (matrix) configuration when viewed from the rear, as shown in Figure 35. In the second embodiment, the four hydrogen tanks 21... are arranged in a 2-row, 2-column configuration when viewed from the rear. That is, the four hydrogen tanks 21... are arranged in two rows vertically and two columns horizontally.

[0190] In the second embodiment, each of the four hydrogen tanks 21... is arranged such that the centerline of the body portion 210 extends in the front-rear direction. One end portion 211 of the hydrogen tank 21... is connected to piping that leads to the fuel cell 22. Specifically, an on / off valve is attached to one end portion 211. Piping that leads to the fuel cell 22 is connected to the on / off valve. This makes it possible to switch the supply and cessation of hydrogen from the hydrogen tanks 21... to the fuel cell 22 by opening and closing the on / off valve. That is, one end of the hydrogen tank 21 in the longitudinal direction (one end portion 211) is connected to piping for extracting hydrogen, which leads to the fuel cell 22. In the second embodiment, the fuel cell 22 is arranged adjacent to the hydrogen tank 21. Specifically, the fuel cell 22 is arranged on the rear side of the hydrogen tank 21.

[0191] The work vehicle 1 is equipped with a tank holder 23 for holding multiple hydrogen tanks 21... Specifically, the work vehicle 1 of the second embodiment has multiple (four) hydrogen tanks 21..., and therefore is equipped with a tank holder 23 for integrally holding these multiple hydrogen tanks 21.... The tank holder 23 is screw-fixed to a support frame 9, which will be described later. In the second embodiment, the hydrogen tanks 21... are arranged in a 2x2 configuration when viewed from the rear, so the tank holder 23 holds the four hydrogen tanks 21... in a 2x2 configuration.

[0192] The fuel cell 22 is located at the front of the vehicle body 5. In the second embodiment, the fuel cell 22 is located in the front region of the vehicle body 5 in the longitudinal direction. That is, the fuel cell 22 is located on the second support portion 90B, described later, which is on the front side of the vehicle body 5 in the longitudinal direction. The fuel cell 22 generates electricity by receiving hydrogen from the hydrogen tank 21... Accordingly, the fuel cell 22 is connected to the hydrogen tank 21 via piping as described above. That is, the work vehicle 1 is equipped with piping that connects the hydrogen tank 21 and the fuel cell 22. In the second embodiment, the fuel cell 22 can suppress the temperature rise during power generation by circulating a coolant. That is, the fuel cell 22 is liquid-cooled.

[0193] The energy storage device 24... is a rechargeable secondary battery. The energy storage device 24... in the second embodiment is a battery pack including a plurality of battery modules BM electrically connected in series, as shown in Figure 44. Each battery module BM includes a plurality of battery cells electrically connected in series. In the second embodiment, the work vehicle 1 is equipped with a plurality of energy storage devices 24... (battery packs), and the plurality of energy storage devices 24... (battery packs) are arranged along the centerline of the hydrogen tank 21... (the longitudinal direction in which the centerline of the body portion 210, described later, extends). That is, in the second embodiment, the plurality of energy storage devices 24... are arranged in a line in the front-rear direction, as shown in Figures 38 and 39. In the second embodiment, the hydrogen tank 21... is positioned above the vehicle body 5 with the centerline of the body portion 210 in the front-rear direction. Accordingly, the plurality of energy storage devices 24... (battery packs) are arranged in a line in the front-rear direction below the hydrogen tank 21....

[0194] In the second embodiment, all or part (in the second embodiment, part) of the energy storage devices 24... are arranged between a pair of side walls 501, 501. Accordingly, the multiple energy storage devices 24... are arranged below the hydrogen tank 21... and along the longitudinal direction of the hydrogen tank 21....

[0195] More specifically, in the second embodiment, the external shape of the multiple energy storage devices 24... (battery packs) is the same, and as shown in Figure 44, when viewed from the front or rear direction (front view), it exhibits a T-shape. Specifically, the energy storage device 24... is composed of three parts. That is, the energy storage device 24... has a first part 241, a second part 242, and a third part 243. The first part 241, the second part 242, and the third part 243 are formed by a casing 240 (battery case 240). In other words, the energy storage device 24... includes a casing 240 that constitutes the outer shell, and the casing 240 defines the first part 241, the second part 242, and the third part 243.

[0196] Each of the first part 241, the second part 242, and the third part 243 is formed in a box shape and, when viewed from the front or back, has a rectangular shape.

[0197] The outer dimensions of the first portion 241 in the lateral direction are set to be smaller than the distance (internal dimension) between the pair of side walls 501, 501. That is, the outer dimensions of the first portion 241 are set to be such that it can be inserted between the pair of side walls 501, 501. The lengths of the first portion 241, the second portion 242, and the third portion 243 in the front-rear direction are set to be the same, and both front-rear surfaces of the first portion 241, the second portion 242, and the third portion 243 are positioned on the same plane.

[0198] The second part 242 and the third part 243 are positioned on either side of the first part 241 in the lateral direction. That is, the second part 242 is positioned to the right of the first part 241, and the third part 243 is positioned to the left of the first part 241. The vertical length of the first part 241 is set to be longer than that of the second part 242 and the third part 243. In contrast, the vertical lengths of the second part 242 and the third part 243 are set to be the same or approximately the same.

[0199] In the second embodiment, the vertical length (height) of the first portion 241 is set to be more than twice the vertical length of the second portion 242 and the third portion 243. The upper surfaces of the first portion 241, the second portion 242, and the third portion 243 form the same plane. That is, the upper surfaces of the second portion 242 and the third portion 243 are positioned at the same height as the upper surface of the first portion 241. As a result, the casing 240 (energy storage device 24...) has a T-shape when viewed from the front. That is, approximately the lower half of the first portion 241 in the vertical direction protrudes downward from the lower surfaces of the second portion 242 and the third portion 243 on both sides in the horizontal direction.

[0200] As a result, the energy storage device 24… (casing 240) is such that the lower side of the first portion 241 (the portion that protrudes downward from the second portion 242 and the third portion 243) can be inserted into the vehicle frame 50 (between the pair of side walls 501, 501), and with the lower side of the first portion 241 (the portion that protrudes downward from the second portion 242 and the third portion 243) inserted into the vehicle frame 50 (between the pair of side walls 501, 501), the lower surfaces of the second portion 242 and the third portion 243 are locked to the upper ends of the pair of side walls 501, 501 (locking pieces 504, 504 in the second embodiment). Accordingly, the vertical length of the portion of the first portion 241 that protrudes downward from the second portion 242 (third portion 243) is set to be less than or equal to the vertical length of the side wall 501.

[0201] In the second embodiment, the first portion 241 houses a plurality of battery modules BM... The plurality of battery modules BM... are stacked vertically within the first portion 241.

[0202] In the second embodiment, the first portion 241 houses two battery module groups G arranged horizontally, each group consisting of multiple battery modules BM stacked vertically within the first portion 241.

[0203] The second section 242 houses electrical components 244, such as a monitoring unit for monitoring the battery module BM. The third section 243 forms an air passage for cooling air that cools the battery module BM, and a heat sink 245 is housed within this air passage. The air passage formed in the third section 243 extends in the front-rear direction, with one end open to the outside and the other end connected to an opening provided on either the front or rear surface of the first section 241. An exhaust pipe (not shown) is connected to the outside through the other opening provided on either the front or rear surface of the first section 241.

[0204] As a result, in the energy storage device 24…(battery pack) 24 of the second embodiment, the cooling air from the third part 243 flows into the first part 241 from either the front or rear surface of the first part 241, and then circulates within the first part 241 in the front-to-back direction, cooling the battery module BM inside the first part 241. The cooling air, heated by the heat generated by the battery module BM, is discharged to the outside from the other of the front or rear surface of the first part 241.

[0205] As described above, in the second embodiment of the energy storage device 24..., the first part 241 is housed inside the vehicle frame 50 (between a pair of side walls 501, 501), and the second part 242 and the third part 243 are locked to a pair of locking pieces 504, 504.

[0206] Furthermore, the upper surface of the energy storage device 24... (second part 242) is set to be lower than the upper surface of the support frame 9, which will be described later, when the second part 242 is locked to the pair of locking pieces 504, 504. Multiple energy storage devices 24... are arranged in a line in the front-to-back direction.

[0207] Multiple energy storage devices 24... are electrically connected in series, and the terminals at the uppermost and lowermost ends of the current flow (positive and negative terminals) are electrically connected to the fuel cell 22 and the first motor M1. As a result, the energy storage devices 24... store the electricity generated by the fuel cell 22 and supply the stored electricity to the first motor M1. In the second embodiment, when the fuel cell 22 is generating electricity, the fuel cell 22 can also supply power to the first motor M1. That is, the first motor M1 rotates by receiving power from the fuel cell 22.

[0208] The work vehicle 1 of the second embodiment is equipped with a first cooling device 25. The first cooling device 25 is a ventilated cooling device. In the second embodiment, the first cooling device 25 is arranged so that the direction of the cooling air outlet is directed outward from the vehicle body 5. That is, the first cooling device 25 is arranged so that the hot air after heat exchange is discharged to the outside.

[0209] In the second embodiment, the first cooling device 25 is a forced heat exchange type radiator that exchanges heat between gas and liquid. As shown in Figure 45, the first cooling device 25 includes a heat exchanger 250 that exchanges heat between air, which is the cooling medium, and a liquid, which is the medium to be cooled, and a blower 251 that forcibly supplies air (cooling medium) to the heat exchanger 250.

[0210] The heat exchanger 250 includes a plurality of heat dissipation fins Fa... arranged at intervals, and a pipe Pa that penetrates the plurality of heat dissipation fins Fa... and through which a liquid (cooling medium) flows. Each of the plurality of heat dissipation fins Fa... is a thin metal plate (sheet) with high thermal conductivity, and is positioned facing the adjacent heat dissipation fins Fa.

[0211] Each of the multiple heat dissipation fins Fa... is formed in the shape of a strip (or rectangular strip), and is stacked with its longitudinal and transverse directions aligned, forming multiple ventilation passages in the stacking direction. Each of the multiple heat dissipation fins Fa... is a thin sheet (or foil) of a metal with high thermal conductivity, such as aluminum or copper. In the second embodiment, the multiple heat dissipation fins Fa... are stacked in a direction perpendicular to the vertical direction.

[0212] Multiple heat dissipation fins Fa constitute a heat dissipation fin group, forming an air passage between adjacent heat dissipation fins Fa, Fa in the stacking direction. In the heat exchanger 250 of the second embodiment, each of the multiple air passages allows air to pass through in the short direction of the heat dissipation fins Fa. As a result, in the heat exchanger 250 (first cooling device 25), one end of the heat dissipation fins Fa in the short direction of the heat dissipation fin group constitutes an intake section 250a for drawing in air, and the other end of the heat dissipation fins Fa in the short direction of the heat dissipation fin group constitutes an exhaust section 250b for expelling (discharging) air. That is, the heat dissipation fin group forms a surface at one end of the multiple heat dissipation fins Fa... in the short direction, and forms a surface at the other end of the multiple heat dissipation fins Fa... in the short direction. As a result, in the heat exchanger 250, one end of each of the multiple heat dissipation fins Fa... in the short direction constitutes an intake section 250a, and the other end of each of the multiple heat dissipation fins Fa... in the short direction constitutes an exhaust section 250b.

[0213] Pipe Pa is a metal pipe with high thermal conductivity. Pipe Pa is a metal tube with high thermal conductivity, and is made of, for example, aluminum or copper. Pipe Pa includes multiple straight pipe sections Pa1 that penetrate multiple heat dissipation fins Fa at multiple locations, and semi-circular bent pipe sections Pa2, each of which consists of multiple turn pipe sections Pa2 connecting two adjacent straight pipe sections Pa1, the ends of Pa1, etc., forming a curved flow path.

[0214] The blower 251 is an electric fan. Specifically, the blower 251 includes a blower blade that can rotate around a predetermined axis and an electric motor that rotates the blower blade, and blows air in the axial direction by the rotation of the blower blade. Accordingly, the blower 251 is positioned with the blower blade facing the heat exchanger 250. In the second embodiment, the blower 251 is positioned facing the exhaust section 250b of the heat exchanger 250. That is, the first cooling device 25 is a suction-type radiator (heat exchange device) that forcibly supplies air to the heat exchanger 250 by the blowing (intake) of the blower 251. In the second embodiment, a suction-type radiator is used for the first cooling device 25, but the first cooling device 25 may also be a push-type radiator.

[0215] In the second embodiment, the first cooling device 25 is supported by a second support portion 90B, which will be described later. As described above, the first cooling device 25 is a suction-type heat exchanger, and the blower 251 is positioned outside the heat exchanger 250. That is, in the first cooling device 25, the heat exchanger 250 is positioned inside the blower 251.

[0216] In the second embodiment, the fuel cell 22 is liquid-cooled, and overheating is prevented by circulating a coolant, which is the cooling medium. Furthermore, if a water jacket is attached to the outer circumference of the hydrogen tanks 21, overheating of the hydrogen tanks 21 is prevented by circulating the coolant, which is the cooling medium, through the water jacket.

[0217] Accordingly, as shown in Figure 46, the first cooling device 25 supplies a cooling liquid (for example, cooling water), which is the cooling medium, to the equipment to be cooled (fuel cell 22 in the second embodiment). That is, the first cooling device 25 is positioned on a circulation path CR1 that circulates the cooling medium, and the circulation path CR1 includes a circulation pump P, a liquid tank, and the equipment to be cooled (fuel cell 22 in the second embodiment) at intermediate positions. In other words, the pipe Pa of the first cooling device 25 is connected to the piping PB1 in the circulation path CR1. When multiple first cooling devices 25 are provided, the pipes Pa of multiple (two) first cooling devices 25 are connected in series or in parallel, and the circulation path CR1 is configured so that the cooling liquid, which is the cooling medium, passes through multiple first cooling devices 25 (heat exchangers 250) sequentially or simultaneously.

[0218] In the first cooling device 25 with the above configuration, the liquid, which is the heat exchange medium, is cooled by exchanging heat with the air between the heat dissipation fins Fa as it flows through the pipe Pa. Therefore, the first cooling device 25 prevents the fuel cell 22 from becoming overheated as the cooled medium (cooling liquid) is supplied to the fuel cell 22.

[0219] The work vehicle 1 of the second embodiment is equipped with the following as equipment EM: inverter EM1, converter EM2, junction box EM3, first motor M1, second motor M2, energy storage device 24, etc. Some of these equipment EM (EM1, EM2, EM3, M1, M2, 24) are liquid-cooled, but in the second embodiment, the inverter EM1, converter EM2, and junction box EM3, which are electrical components among these equipment EM, will be described as examples of liquid-cooled components. In the following description, the inverter EM1, converter EM2, and junction box EM3 will be collectively referred to as electrical components EM1, EM2, and EM3.

[0220] The second cooling device 26 is a ventilated cooling device. More specifically, the second cooling device 26 is a forced heat exchange type radiator that exchanges heat between gas and liquid. More specifically, as shown in Figure 47, the second cooling device 26 includes a heat exchanger 260 that exchanges heat between air, which is the cooling medium, and a liquid, which is the medium to be cooled, and a blower 261 that forcibly supplies air (cooling medium) to the heat exchanger 260.

[0221] The heat exchanger 260 includes a plurality of heat dissipation fins Fb... arranged at intervals, and a pipe Pb that penetrates the plurality of heat dissipation fins Fb... and through which a liquid (cooling medium) flows. Each of the plurality of heat dissipation fins Fb... is a thin metal plate (sheet) with high thermal conductivity, and is positioned facing the adjacent heat dissipation fins Fb.

[0222] Each of the multiple heat dissipation fins Fb... is formed in the shape of a strip (or rectangular strip), and is stacked with its longitudinal and transverse directions aligned, forming multiple air passages in the stacking direction. Each of the multiple heat dissipation fins Fb... is a thin sheet (or foil) of a metal with high thermal conductivity, such as aluminum or copper.

[0223] Multiple heat dissipation fins Fb... constitute a heat dissipation fin group, forming an air passage between adjacent heat dissipation fins Fb, Fb in the stacking direction. In the heat exchanger 260 of the second embodiment, each of the multiple air passages allows air to pass through in the short direction of the heat dissipation fins Fb. As a result, in the heat exchanger 260 (second cooling device 26), one end of the heat dissipation fins Fb in the short direction constitutes an intake section 260a for drawing in air, and the other end of the heat dissipation fins Fb in the short direction constitutes an exhaust section 260b for expelling (discharging) air. That is, the heat dissipation fin group forms a surface at one end of the multiple heat dissipation fins Fb... in the short direction, and forms a surface at the other end of the multiple heat dissipation fins Fb... in the short direction. As a result, in the heat exchanger 260, one end of the multiple heat dissipation fins Fb... in the short direction constitutes the intake section 260a, and the other end of the multiple heat dissipation fins Fb... in the short direction constitutes the exhaust section 260b.

[0224] Pipe Pb is a metal pipe with high thermal conductivity. Pipe Pb is a metal tube with high thermal conductivity, and is made of, for example, aluminum or copper. Pipe Pb includes multiple straight pipe sections Pb1 that penetrate multiple heat dissipation fins Fb at multiple locations, and multiple semicircular bent pipe sections Pb2, each of which connects the ends of two adjacent straight pipe sections Pb1, forming a curved flow path.

[0225] The blower 261 is an electric fan. Specifically, the blower 261 includes a blower blade that can rotate around a predetermined axis and an electric motor that rotates the blower blade, and blows air in the axial direction by the rotation of the blower blade. Accordingly, the blower 261 is positioned with the blower blade facing the heat exchanger 260. In the second embodiment, the blower 261 is positioned facing the exhaust section 260b of the heat exchanger 260. Specifically, the second cooling device 26 is a suction-type radiator (heat exchange device) that forcibly supplies air to the heat exchanger 260 by the blowing (intake) of the blower 261. In the second embodiment, a suction-type radiator is used for the second cooling device 26, but the second cooling device 26 may also be a push-type radiator.

[0226] In the second embodiment, the second cooling device 26 is supported by the second support portion 90B, similar to the first cooling device 25. As described above, the second cooling device 26 is a suction-type heat exchanger, and the blower 261 is positioned outside the heat exchanger 260. That is, in the second cooling device 26, the heat exchanger 260 is positioned inside the blower 261.

[0227] In the second embodiment, the electrical components EM1, EM2, and EM3 of the equipped equipment EM are liquid-cooled, and by circulating water (coolant), which is the cooling medium, it is prevented that the electrical components EM1, EM2, and EM3 become overheated.

[0228] Accordingly, as shown in Figure 48, the second cooling device 26 supplies the cooling liquid, which is the cooling medium, to the equipment EM (electrical components EM1, EM2, and EM3 as described above) to be cooled. In other words, the second cooling device 26 is located on the circulation path CR2 that circulates the cooling medium, and the circulation path CR2 includes a circulation pump P, a liquid tank, and the electrical components EM1, EM2, and EM3 to be cooled at intermediate positions. Specifically, the pipe Pb of the second cooling device 26 is connected to the piping PB2 in the circulation path CR2.

[0229] In the second cooling device 26 configured as described above, the coolant, which is the heat exchange medium, is cooled by exchanging heat with additional air between the heat dissipation fins Fa as it flows through the pipe Pa. Therefore, the cooled coolant is supplied to the electrical components EM1, EM2, and EM3, and as a result, the second cooling device 26 prevents the electrical components EM1, EM2, and EM3 from becoming overheated. When multiple liquid-cooled electrical components EM1, EM2, and EM3 are provided, the multiple electrical components EM1, EM2, and EM3 are connected in series on the circulation path CR2, and the coolant flows sequentially through them, or a separate circulation path CR2 is provided for each electrical component EM1, EM2, and EM3. In the latter case, the second cooling device 26 is provided for each circulation path CR2. In the second embodiment, a single circulation path CR2 (second cooling device 26) cools multiple electrical components EM1, EM2, and EM3.

[0230] The first cooling device 25 and the second cooling device 26 are as described above, and at least one of the first cooling device 25 and the second cooling device 26 is positioned in front of the hydrogen tank 21 in the longitudinal direction of the vehicle body 5. In the work vehicle 1 of the second embodiment, both the first cooling device 25 and the second cooling device 26 are positioned in front of the hydrogen tank 21 in the longitudinal direction of the vehicle body 5. Also, at least one of the first cooling device 25 and the second cooling device 26 is positioned in front of the fuel cell 22. In the work vehicle 1 of the second embodiment, only the second cooling device 26 is positioned in front of the fuel cell 22. Furthermore, at least one of the first cooling device 25 and the second cooling device 26 is positioned between the hydrogen tank 21 and the fuel cell 22. In the work vehicle 1 of the second embodiment, in a plan view, only the first cooling device 25 is positioned between the hydrogen tank 21 and the fuel cell 22. That is, the first cooling device 25 and the second cooling device 26 are positioned on either side of the fuel cell 22.

[0231] In the second embodiment, the first cooling device 25 is located between the pair of front traveling devices 6F, 6F in a plan view. In contrast, the second cooling device 26 is located in front of the pair of front traveling devices 6F, 6F in the front-rear direction.

[0232] The impulse support mechanism 7 is attached to the rear end of the vehicle body 5 (the rear end of the gear case 51). Note that the impulse support mechanism 7 in the second embodiment is a known three-point linkage mechanism, so its explanation is omitted here.

[0233] As described above, the control device 8 controls the vehicle's movement and other functions via communication (remote control), or performs so-called automatic driving control, which involves controlling the vehicle's movement and other functions based on pre-set information (programs).

[0234] As shown in Figure 49, the control device 8 comprises an arithmetic control unit 80, a storage unit 81 that stores information used in the processing of the arithmetic control unit 80, an input unit 82 that receives input signals (electrical signals) from at least a receiving device (transceiver: not shown) that receives signals from the outside, switches, sensing devices SE1, SE2 (described later), etc., and an output unit 83 that outputs control signals to the electric equipment to be controlled (first motor M1, second motor M2, actuator, etc.). Based on the input signals received from the input unit 82 and the information stored in the storage unit 81, the control device 8 generates control signals to control each part of the work vehicle 1 and outputs them to each part to be controlled.

[0235] The arithmetic control unit 80 is a CPU (EPU) and includes an arithmetic unit 800 and a control unit 801. In the control device 8 of the second embodiment, the storage unit 81 includes a first storage unit 810 that temporarily or short-term stores information used for processing by the arithmetic control unit 80 (arithmetic unit 800 and control unit 801), and a second storage unit 811 that long-term stores information used for processing by the arithmetic control unit 80 (arithmetic unit 800 and control unit 801). The first storage unit 810 is a so-called memory, and the second storage unit 811 is a storage device such as a hard disk or an SSD (Solid State Drive).

[0236] As shown in Figure 33, the hydrogen tank 21, fuel cell 22, first cooling device 25, and second cooling device 26 are installed on the vehicle body 5. That is, the hydrogen tank 21, fuel cell 22, first cooling device 25, and second cooling device 26 are directly or indirectly supported by the vehicle body 5.

[0237] The work vehicle 1 of the second embodiment is a support frame 9 connected to and supported by the vehicle body 5 (vehicle body frame 50 and gear case 51), and includes a support frame 9 that supports the hydrogen tank 21, fuel cell 22, first cooling device 25 and second cooling device 26.

[0238] As shown in Figure 37, the support frame 9 is positioned on the vehicle body 5. The front end of the support frame 9 in the longitudinal direction is connected to the vehicle body frame 50, and the rear end of the support frame 9 in the longitudinal direction is connected to the gear case 51. The hydrogen tanks 21... and the fuel cell 22 are positioned (mounted) on the support frame 9 directly or indirectly. In the second embodiment, as described above, the hydrogen tanks 21... are held by the tank holders 23 and are therefore positioned on the support frame 9 via the tank holders 23. In this way, the support frame 9 supports the hydrogen tanks 21... and the fuel cell 22.

[0239] As shown in Figures 37 and 38, the support frame 9 is positioned at least between the front wheels 60F, 60F and the rear wheels 60R, 60R. The support frame 9 is provided extending from the front to the rear in the longitudinal direction of the vehicle body frame 50. In the second embodiment, the support frame 9 extends beyond the vehicle body frame 50 and extends from the front to the rear (over the entire length) of the vehicle body 5 in the longitudinal direction.

[0240] In the second embodiment, the front end of the support frame 9 in the front-rear direction is connected to the vehicle body frame 50, and the rear end of the support frame 9 in the front-rear direction is connected to the gear case 51.

[0241] More specifically, the support frame 9 is provided on the vehicle body 5, and the total length of the support frame 9 in the front-rear direction is set to be greater than or equal to the total length of the vehicle body 5 in the front-rear direction. As shown in Figures 50 to 52, the support frame 9 includes a first support section 90A that supports the hydrogen tanks 21... and a second support section 90B that supports at least the fuel cell 22 and the first cooling device 25. In the second embodiment, the second support section 90B supports a second cooling device 26 in addition to the fuel cell 22 and the first cooling device 25. Furthermore, the second support section 90B supports the electrical components EM1, EM2, and EM3 among the equipped equipment EM.

[0242] The first support section 90A and the second support section 90B are aligned in the front-rear direction. In the second embodiment, the second support section 90B is located in front of the first support section 90A in the front-rear direction. Also in the second embodiment, the first support section 90A and the second support section 90B support the hydrogen tanks 21..., fuel cells 22, first cooling device 25, and second cooling device 26 at the same height.

[0243] More specifically, the first support portion 90A has a support surface S1 (hereinafter referred to as the first support surface S1) that supports the hydrogen tank 21, and the second support portion 90B has a support surface S2 (hereinafter referred to as the second support surface S2) that supports at least the fuel cell 22 and the first cooling device 25. In the second embodiment, the first support surface S1 and the second support surface S2 are continuous planes. That is, the first support surface S1 and the second support surface S2 are composed of the same plane.

[0244] In the second embodiment, the first support portion 90A (first support surface S1) and the second support portion 90B (second support surface S2) are set to a position (height) higher than the rear wheel 60R. The support frame 9 is configured to support the electrical components EM1, EM2, and EM3 (inverter EM1, converter EM2, and junction box EM3) of the equipped equipment EM below either the first support surface S1 or the second support surface S2.

[0245] More specifically, the support frame 9 comprises a lower frame portion 91A that is rectangular in shape when viewed from above, an upper frame portion 91B that is positioned above the lower frame portion 91A and overlaps with the lower frame portion 91A when viewed from above, and a plurality of legs 905 interposed between the lower frame portion 91A and the upper frame portion 91B.

[0246] The lower frame portion 91A includes a pair of first lower beam portions 910A, 910A arranged at intervals in the lateral direction, the pair of first lower beam portions 910A, 910A extending in the front-rear direction, and a plurality of second lower beam portions 911A... arranged at intervals in the front-rear direction, each of which extends in the lateral direction and connects the pair of first lower beam portions 910A, 910A to each other.

[0247] The upper frame portion 91B includes a pair of first upper beam portions 910B, 910B arranged at intervals in the lateral direction, the pair of first upper beam portions 910B, 910B extending in the front-rear direction, and a plurality of second upper beam portions 911B... arranged at intervals in the front-rear direction, each of which extends in the lateral direction and connects the pair of first upper beam portions 910B, 910B to each other. The support frame 9 of the second embodiment is a support plate 920 arranged on the upper frame portion 91B, the support plate 920 whose upper surface constitutes a first support surface S1 on which hydrogen tanks 21... (tank holders 23) are arranged and a second support surface S2 that supports the fuel cell 22 and the first cooling device 25. In the second embodiment, the second support surface S2 also supports the second cooling device 26 in addition to the fuel cell 22 and the first cooling device 25.

[0248] The upper frame section 91B is positioned above the lower frame section 91A such that a pair of first upper beam sections 910B, 910B overlap with a pair of first lower beam sections 910A, 910A in the vertical direction. That is, the multiple leg sections 905... are erected on each of the pair of first lower beam sections 910A, 910A at intervals in the front-rear direction, and their upper ends support the pair of first upper beam sections 910B, 910B. As a result, the support frame 9 has a space SP (hereinafter referred to as the lower space SP) below the support plate 920 for arranging the equipment EM.

[0249] The support plate 920 is positioned across a pair of first upper beams 910B, 910B and fixed to the upper surfaces of the pair of first upper beams 910B, 910B. The support plate 920 is sized to allow the hydrogen tank 21 (tank holder 23), fuel cell 22, first cooling device 25, and second cooling device 26 to be arranged side by side in the front-to-back direction. Specifically, in the second embodiment, the support plate 920 is formed in a rectangular shape in plan view. Assuming that the shorter side of the support plate 920 is positioned laterally, the length in the shorter side is set to be shorter than the distance between the pair of front wheels 60F, 60F. The length in the longitudinal direction of the support plate 920 is set to be longer than the combined length in the front-to-back direction of the hydrogen tank 21 (tank holder 23), fuel cell 22, first cooling device 25, and second cooling device 26.

[0250] As shown in Figure 52, brackets 902, 903, and 904 for fixing to the vehicle body 5 are attached to the lower surface of the support frame 9 (each of the pair of first lower beams 910A, 910A). The brackets 902, 903, and 904 are positioned to overlap the vehicle body 5 (vehicle body frame 50) and are screw-fixed to the vehicle body 5. Specifically, the support frame 9 comprises a plurality of brackets 902, 903, and 904, which are arranged at intervals in the front-rear direction.

[0251] In the second embodiment, the support frame 9 includes a first bracket 902 attached to the front end, which overlaps the front end of the vehicle body frame 50, and a second bracket 903 attached to the rear end, which overlaps the gear case 51. The support frame 9 of the second embodiment also includes a third bracket 904 positioned between the first bracket 902 and the second bracket 903 in the front-rear direction, which overlaps the connecting member 55 located between the vehicle body frame 50 and the gear case 51.

[0252] The first bracket 902 is fixed directly or indirectly to the vehicle frame 50, and the second bracket 903 is fixed directly or indirectly to the gear case 51. In the second embodiment, the first bracket 902 is fixed to the vehicle frame 50, and the second bracket 903 is fixed to a support base 530 (see Figures 38 and 39) erected on the gear case 51. The third bracket 904 is fixed to the connecting member 55. These are fixed by screws (screw fixing). The height of each of the first bracket 902, the second bracket 903, and the third bracket 904 is set so that the support frame 9 (first support surface S1 and second support surface S2) is in a predetermined position (horizontal or substantially horizontal position when the work vehicle 1 is placed on a horizontal plane).

[0253] In the second embodiment, the hydrogen tanks 21... and the fuel cell 22 are arranged side by side in the front-to-back direction (see Figure 33). In the second embodiment, the hydrogen tanks 21... are positioned behind the fuel cell 22. Accordingly, the rear area of ​​the support frame 9 is designated as the first support section 90A that supports the hydrogen tanks 21..., and the front area of ​​the support frame 9 is designated as the second support section 90B that supports the fuel cell 22, the first cooling device 25, and the second cooling device 26.

[0254] Furthermore, the inverter EM1, converter EM2, and junction box EM3 are also arranged in the lower space SP of at least one of the first support section 90A and the second support section 90B. In the second embodiment, as shown in Figure 33, the inverter EM1, converter EM2, and junction box EM3 are arranged in the lower space SP of the second support section 90B, among the equipped equipment EM. The equipment arranged in the lower space SP (in the second embodiment, the inverter EM1, converter EM2, and junction box EM3) is connected and supported to the support frame 9 (upper frame section 91B, lower frame section 91A, or leg section 905) via brackets (not shown).

[0255] The second cooling device 26 is positioned along the front edge of the support plate 920 on the second support portion 90B (second support surface S2) of the support plate 920. Next, the fuel cell 22 is positioned on the second support portion 90B (second support surface S2) of the support plate 920, facing the second cooling device 26 on the rear side. Furthermore, the first cooling device 25 is positioned on the second support portion 90B (second support surface S2) of the support plate 920, facing the fuel cell 22 on the rear side.

[0256] As a result, in the second embodiment, the fuel cell 22, the first cooling device 25, and the second cooling device 26 are arranged in the order of second cooling device 26, fuel cell 22, and first cooling device 25 in the range (region) of the upper surface of the support plate 920 that becomes the second support surface S2, from the front side in the front-rear direction to the rear side. In addition, the hydrogen tank 21 (tank holder 23) is arranged in the range (region) of the upper surface of the support plate that becomes the first support surface S1. Therefore, in the work vehicle 1 of the second embodiment, the fuel cell 22, the first cooling device 25, and the second cooling device 26 are arranged in the order of second cooling device 26, fuel cell 22, first cooling device 25, and hydrogen tank 21 (tank holder 23) in the upper surface of the support plate 920, from the front side in the front-rear direction to the rear side.

[0257] Therefore, the fuel cell 22 is positioned in front of the first cooling device 25 in the front-rear direction. The fuel cell 22 is also positioned behind the second cooling device 26 in the front-rear direction. The first cooling device 25 is positioned between the hydrogen tank 21 and the fuel cell 22.

[0258] As shown in Figure 36, the sensing devices SE1 and SE2 are arranged at multiple locations (four locations in the second embodiment) on the front, rear, left, and right sides. This allows the sensing devices SE1 and SE2 to detect the conditions around the vehicle body 5. The work vehicle 1 of the second embodiment is equipped with multiple sensing devices SE1 and SE2. This allows the work vehicle 1 to recognize the conditions over a wide area around the vehicle body 5. The multiple sensing devices SE1 and SE2 are either cameras or lidar, or a combination of cameras and lidar. In the second embodiment, each of the multiple sensing devices SE1 and SE2 is the same camera. In the second embodiment, each of the multiple sensing devices SE1 and SE2 can be a wide-angle camera, a 360° camera, etc., and in the second embodiment, each of the multiple sensing devices SE1 and SE2 is a wide-angle camera.

[0259] Each of the multiple sensing devices SE1 and SE2 is positioned on the outside of the first bonnet 3 or the outside of the second bonnet 4. In the second embodiment, each of the multiple sensing devices SE1 and SE2 is attached to the upper surface (outer surface) of the first top plate 33 of the first bonnet 3 and the second top plate 43 of the second bonnet 4.

[0260] More specifically, the work vehicle 1 of the second embodiment is equipped with four sensing devices SE1 and SE2. One of the four sensing devices SE1 is mounted on the center of the width direction at the front end of the upper surface of the second top plate 43 of the second bonnet 4, and monitors the front of the vehicle body 5. In contrast, of the remaining three sensing devices SE2, two of them are mounted on both ends in the lateral direction of the upper surface of the first top plate 33 of the first bonnet 3, and monitor both sides of the vehicle body 5. The remaining sensing device SE2 is mounted on the center of the width direction at the rear end of the upper surface of the first top plate 33 of the first bonnet 3, and monitors the rear of the vehicle body 5.

[0261] In this way, since each of the multiple sensing devices SE1 and SE2 is mounted on the highest position (outer surface of the first top plate 33 and second top plate 43) of the first bonnet 3 and second bonnet 4 that constitute the exterior of the work vehicle 1, there is nothing in the surroundings that obstructs the sensing (detection) of the sensing devices SE1 and SE2, and the surroundings can be reliably detected (monitored). Furthermore, since the four sensing devices SE1, SE2, etc. are arranged in four locations on the front, rear, left, and right sides of the vehicle body 5, it becomes possible to monitor the entire surroundings of the vehicle body 5 (work vehicle 1).

[0262] The work vehicle 1 (agricultural tractor 1) of the second embodiment is as described above, and assuming that the hydrogen tank 21 and fuel cell 22 are arranged in the front-to-rear direction on the vehicle body 5, and the fuel cell 22 is positioned in front of the hydrogen tank 21 (the hydrogen tank 21 is positioned behind the fuel cell 22), the first cooling device 25 and the second cooling device 26 are positioned in front of the hydrogen tank 21 in the front-to-rear direction on the vehicle body 5, so that the first cooling device 25 and the second cooling device 26 are positioned in the appropriate positions with respect to the arrangement of the front-to-rear hydrogen tank and fuel cell.

[0263] Furthermore, since the first cooling device 25 is positioned between the pair of front running gears 6F, 6F, the first cooling device 25 is positioned in an appropriate location without protruding from the vehicle width or interfering with the pair of front running gears 6F, 6F.

[0264] Furthermore, because the first cooling device 25 is located behind the fuel cell 22 and between the hydrogen tank 21 and the fuel cell 22, the space between the hydrogen tank 21 and the fuel cell 22 is effectively utilized.

[0265] Furthermore, since the second cooling device 26 is positioned in front of the fuel cell 22 in the longitudinal direction of the vehicle body 5, the first cooling device 25 and the second cooling device 26 are positioned at separate locations. This prevents the first cooling device 25 and the second cooling device 26 from influencing (or influencing) each other with heat.

[0266] It should be noted that the present invention is not limited to the second embodiment, and can be modified as appropriate without departing from the spirit of the invention.

[0267] In the second embodiment, the front running gears 6F, 6F are equipped with front wheels 60F, 60F, and these front wheels are tire wheels (front wheels), while the rear running gears 6R, 6R are equipped with rear wheels 60R, 60R, and these rear wheels are tire wheels (rear wheels), but the invention is not limited to this. For example, the work vehicle 1 may be a half-crawler type, as shown in Figure 53, in which tire wheels are used for the front wheels 60F, 60F of the front running gears 6F, 6F, and crawler devices (continuous track running gear) are used for the rear running gears 6R, 6R.

[0268] In this case, among the multiple wheels (sprockets (drive wheels), idlers (guider wheels)) around which the endless annular track belt (crawler belt) is wrapped, the rearmost wheel in the longitudinal direction becomes the rear wheel 60R, 60R. Alternatively, a half-crawler type may be used, in which tire wheels are used for the rear wheels 60R, 60R of the rear running gear 6R, 6R, and crawler gear (endless track running gear) is used for the front running gear 6F, 6F. In this case, among the multiple wheels (sprockets (drive wheels), idlers (guider wheels)) around which the endless annular track belt (crawler belt) is wrapped, the frontmost wheel in the longitudinal direction becomes the front wheel 60F, 60F.

[0269] Furthermore, as shown in Figure 54, the work vehicle 1 may be a full crawler type in which the front wheels 60F, 60F and the rear wheels 60R, 60R are replaced with crawler devices positioned below the vehicle body 5. In other words, a crawler device that integrates the front running gear 6F and the rear running gear 6R may be adopted. In this case, among the multiple wheels (sprockets (drive wheels), idlers (guide wheels)), the wheels furthest forward in the longitudinal direction become the front wheels 60F, 60F, and the wheels furthest rear in the longitudinal direction become the rear wheels 60R, 60R.

[0270] In the second embodiment, an agricultural tractor was described as an example of the work vehicle 1, but the work vehicle 1 is not limited to an agricultural tractor. For example, the work vehicle 1 may be a specialized machine such as a combine harvester or a multi-purpose work vehicle (utility vehicle: UV) other than a tractor. Furthermore, the work vehicle 1 may be a construction vehicle or a civil engineering vehicle.

[0271] In the second embodiment, a work vehicle 1 equipped with four hydrogen tanks 21, arranged vertically and horizontally (in two rows and two columns), was described, but the invention is not limited to this. For example, one or more hydrogen tanks 21 are sufficient. That is, the size and number of hydrogen tanks 21 should be determined according to the required hydrogen storage capacity.

[0272] In the second embodiment, assuming that the fuel cell 22 is provided at the front of the vehicle body 5 in the longitudinal direction and the hydrogen tank 21 is provided at the rear of the vehicle body 5 in the longitudinal direction (the hydrogen tank 21 is positioned behind the fuel cell), the second cooling device 26 is positioned in front of the fuel cell 22 and the first cooling device 25 is positioned behind the fuel cell 22 within the second support portion 90B (second support surface S2), but the invention is not limited thereto. For example, in another embodiment of the present invention, as shown in Figures 55 and 56, assuming that the fuel cell 22 is provided at the front of the vehicle body 5 in the longitudinal direction and the hydrogen tank 21 is provided at the rear of the vehicle body 5 in the longitudinal direction (the hydrogen tank 21 is positioned behind the fuel cell), the first cooling device 25 may be positioned in front of the fuel cell 22 and the second cooling device 26 may be positioned behind the fuel cell 22 within the second support portion 90B (second support surface S2). In other words, the arrangement of the first cooling device 25 and the arrangement of the second cooling device 26 may be swapped based on the arrangement of the second embodiment. In this arrangement, either the first cooling device 25 or the second cooling device 26 is located between the fuel cell 22 and the hydrogen tank 21, and the space between the fuel cell 22 and the hydrogen tank 21 is effectively utilized.

[0273] Furthermore, as another embodiment of the present invention, as shown in Figures 57 and 58, assuming that the fuel cell 22 is provided at the front of the vehicle body 5 in the longitudinal direction and the hydrogen tank 21 is provided at the rear of the vehicle body 5 in the longitudinal direction (the hydrogen tank 21 is positioned behind the fuel cell), the first cooling device 25 and the second cooling device 26 may be arranged behind the fuel cell 22 within the second support portion 90B (second support surface S2). In this case as well, the arrangement of the first cooling device 25 and the arrangement of the second cooling device 26 may be swapped. According to this arrangement, the first cooling device 25 and the second cooling device 26 are located between the fuel cell 22 and the hydrogen tank 21, and the space between the fuel cell 22 and the hydrogen tank 21 is effectively utilized. Although not shown here, the first cooling device 25 and the second cooling device 26 may of course be arranged in front of the fuel cell 22.

[0274] Furthermore, in yet another embodiment of the present invention, as shown in Figures 59 and 60, assuming that the fuel cell 22 is provided at the front of the vehicle body 5 in the longitudinal direction and the hydrogen tank 21 is provided at the rear of the vehicle body 5 in the longitudinal direction (the hydrogen tank 21 is positioned behind the fuel cell), the first cooling device 25 may be positioned in front of the fuel cell 22 within the second support portion 90B (second support surface S2), and the second cooling device 26 may be positioned below the fuel cell 22 (lower space SP). Also, in this configuration, the arrangement of the first cooling device 25 and the arrangement of the second cooling device 26 may be swapped.

[0275] Furthermore, in yet another embodiment of the present invention, as shown in Figures 61 and 62, assuming that the fuel cell 22 is provided at the front of the vehicle body 5 in the longitudinal direction and the hydrogen tank 21 is provided at the rear of the vehicle body 5 in the longitudinal direction (the hydrogen tank 21 is positioned behind the fuel cell), the first cooling device 25 may be positioned behind the fuel cell 22 within the second support portion 90B (second support surface S2), and the second cooling device 26 may be positioned below the fuel cell 22 (lower space SP). Also, in this configuration, the positions of the first cooling device 25 and the second cooling device 26 may be swapped.

[0276] Furthermore, as yet another embodiment of the present invention, as shown in Figures 63 and 64, assuming that the fuel cell 22 is provided at the front of the vehicle body 5 in the longitudinal direction and the hydrogen tank 21 is provided at the rear of the vehicle body 5 in the longitudinal direction (the hydrogen tank 21 is positioned behind the fuel cell), the first cooling device 25 may be positioned behind the fuel cell 22 within the second support portion 90B (second support surface S2), and the second cooling device 26 may be positioned below the fuel cell 22 (lower space SP) and behind the first cooling device 25 (below the hydrogen tank 21).

[0277] In other words, the fuel cell 22 and the first cooling device 25 may be arranged within the second support section 90B, and the hydrogen tank 21 and the second cooling device 26 may be arranged within the first support section 90A. Therefore, the second cooling device 26 may be arranged on the first support surface S1 (in front of or behind the hydrogen tank 21). In this arrangement, the arrangement of the first cooling device 25 and the arrangement of the second cooling device 26 may also be swapped. According to the configurations shown in Figures 59 to 64, since either the first cooling device 25 or the second cooling device 26 is arranged in the lower space SP, the size of the vehicle body 5 (support frame 9) in the front-rear direction can be made more compact.

[0278] Furthermore, in yet another embodiment of the present invention, as shown in Figures 65 and 66, the first cooling device 25 may be positioned behind the fuel cell 22, and the second cooling device 26 may be positioned below (directly below) the first cooling device 25 within the lower space SP. Alternatively, as shown in Figures 67 and 68, the first cooling device 25 may be positioned in front of the fuel cell 22, and the second cooling device 26 may be positioned below (directly below) the first cooling device 25 within the lower space SP. In other words, the first cooling device 25 and the second cooling device 26 may be positioned side by side in the vertical direction. In this case as well, the positions of the first cooling device 25 and the second cooling device 26 may be swapped.

[0279] Furthermore, in the second embodiment, one first bonnet 3 and one second bonnet 4 are provided, but this is not limited to this. For example, two or more first bonnets 3 may be provided. Also, two or more second bonnets 4 may be provided. In other words, the arrangement and number of the first bonnets 3 and the second bonnets 4 may be appropriately changed according to the arrangement and number of equipment to be protected, and the sizes of the first bonnets 3 and the second bonnets 4 may also be appropriately changed according to the configuration to be housed.

[0280] In the second embodiment, cameras were used for the sensing devices SE1 and SE2, but the invention is not limited to this. For example, various types of sensors can be used for the sensing devices SE1 and SE2. For example, the sensing devices SE1 and SE2 may be LiDAR, which is a distance measuring sensor, an infrared sensor, a temperature sensor (thermal sensor), etc. In other words, the sensing devices SE1 and SE2 should be equipped with sensors necessary to ensure safety in remote driving or autonomous driving (unmanned driving). Furthermore, the sensing devices SE1 and SE2 mounted on the work vehicle 1 are not limited to one type, but multiple types of sensors can be used and mounted on the work vehicle 1 (vehicle body 2 (vehicle 5)).

[0281] In the second embodiment, the work vehicle 1 is equipped with one first cooling device 25 and one second cooling device 26, but is not limited thereto. Each of the first cooling device 25 and the second cooling device 26 may be a single unit having a heat exchange capacity corresponding to the amount of heat generated by the equipment to be cooled, or the number of first cooling devices 25 may be set according to the amount of heat generated by the equipment to be cooled. However, the conditions for the arrangement of the first cooling device 25 and the second cooling device 26 are as described above.

[0282] In the second embodiment, the entire first bonnet 3 and the entire second bonnet 4 are configured to be openable and closable, but the invention is not limited to this. For example, the entire first bonnet 3 may be configured to be openable and closable, and a part of the second bonnet 4 may be configured to be openable and closable. Alternatively, a part of the first bonnet 3 may be configured to be openable and closable, and the entire second bonnet 4 may be configured to be openable and closable. Furthermore, a part of each of the first bonnet 3 and the second bonnet 4 may be configured to be openable and closable. In this case, when a part of the first bonnet 3 or the second bonnet 4 is configured to be openable and closable, the part of the first bonnet 3 or the second bonnet 4 is made into an openable and closable door.

[0283] This allows access to the interior of the first bonnet 3, enabling maintenance and inspection of equipment such as the hydrogen tank 21. Even when a portion of the second bonnet 4 can be opened and closed, it is still possible to access the interior of the second bonnet 4, enabling maintenance and inspection of the equipped equipment EM. With regard to the first bonnet 3, it is preferable to provide a sealing member around the door to suppress hydrogen leakage to the outside, so that the inside of the first bonnet 3 can be airtight when closed.

[0284] In the second embodiment, an example of equipment EM to be cooled by the second cooling device 26 was given as an inverter EM1, a converter EM2, and a junction box EM3, which are electrical components, but the embodiment is not limited to these. That is, the equipment EM to be cooled by the second cooling device 26 can be any equipment EM that is assumed to be liquid-cooled, for example, a first motor M1, a second motor M2, a power storage device 24, etc. In this case as well, the first motor M1, the second motor M2, and the power storage device 24 are incorporated into the circulation path CR2 which includes the second cooling device 26.

[0285] In the second embodiment, the first support surface S1 and the second support surface S2 of the support frame 9 are at the same level (same surface), but the embodiment is not limited to this. For example, the first support surface S1 and the second support surface S2 may be arranged at different height positions. However, in order for a lower space SP for arranging the equipment EM to be placed below either the first support surface S1 or the second support surface S2, it is sufficient that one of the first support surface S1 or the second support surface S2 is positioned higher than the other of the first support surface S1 or the second support surface S2 to match the arrangement of the lower space SP. That is, an upper frame portion 91B is provided that corresponds to the arrangement and size of either the first support portion 90A or the second support portion 90B, and the upper frame portion 91B is supported by legs 905 erected on the lower frame portion 91A.

[0286] In this case, since the first support surface S1 and the second support surface S2 are not on the same plane, it goes without saying that when a support plate 920 is provided, the support plate 920 will be provided separately and independently as a support plate 920 placed on the upper frame portion 91B and a support plate 920 placed on the lower frame portion 91A. In the second embodiment, the support frame 9 is provided with a support plate 920, but for example, the equipment (hydrogen tank 21, fuel cell 22, etc.) can be supported by the lower frame portion 91A or the upper frame portion 91B without providing a support plate 920.

[0287] In the second embodiment, one example given was the case where the equipment EM, consisting of an inverter EM1, a converter EM2, and a junction box EM3, is cooled by the second cooling device 26, but the embodiment is not limited to this. For example, the equipment EM cooled by the second cooling device 26 may be at least one of the inverter EM1, converter EM2, and junction box EM3. Also, if the energy storage device 24 is liquid-cooled, the energy storage device 24 will be the target of cooling by the second cooling device 26. In other words, the equipment EM (device) cooled by the second cooling device 26 may be at least one of the inverter EM1, converter EM2, and energy storage device 24.

[0288] The embodiments of the present invention (the first, second, and third inventions) are as described above, and the present invention (preferred embodiments thereof) provides a work vehicle 1 as described in the following items (item 1, item 2, item 3).

[0289] (Item 1-1: First Invention) A work vehicle 1 comprising a vehicle body 5, a hydrogen tank 21 provided at the front of the vehicle body 5 for storing hydrogen, a fuel cell 22 provided on the vehicle body 5 for generating electricity using hydrogen supplied from the hydrogen tank 21, equipment EM (EM1, EM2, EM3) for receiving electricity generated by the fuel cell 22, a first cooling device 25 for cooling at least one of the hydrogen tank 21 and the fuel cell 22, and a second cooling device 26 for cooling the equipment EM (EM1, EM2, EM3), wherein at least one of the first cooling device 25 and the second cooling device 26 is positioned behind the hydrogen tank 21 in the front-rear direction of the vehicle body 5.

[0290] According to the work vehicle 1 of item 1-1, at least one of the first cooling device 25 and the second cooling device 26 is positioned behind the hydrogen tank 21 in the longitudinal direction of the vehicle body 5. Therefore, taking into account the hydrogen tank and fuel cell, at least one of the first cooling device 25 and the second cooling device 26 is positioned in an appropriate location.

[0291] (Item 1-2) The work vehicle 1 according to Item 1-1, wherein the fuel cell 22 is arranged alongside the hydrogen tank 21 in the front-rear direction of the vehicle body 5, and at least one of the first cooling device 25 and the second cooling device 26 is arranged behind the fuel cell 22 in the front-rear direction of the vehicle body 5.

[0292] According to the work vehicle 1 of item 1-2, at least one of the first cooling device 25 and the second cooling device 26 is positioned behind the fuel cell 22 in the longitudinal direction of the vehicle body 5. Therefore, the cooling device is positioned in a more appropriate location, taking into account the arrangement of the hydrogen tank and the fuel cell.

[0293] (Item 1-3) The work vehicle 1 according to Item 1-1 or Item 1-2, wherein the fuel cell 22 is arranged alongside the hydrogen tank 21 in the front-rear direction of the vehicle body 5, and at least one of the first cooling device 25 and the second cooling device 26 is arranged below the fuel cell 22.

[0294] According to the work vehicle 1 of item 1-3, at least one of the first cooling device 25 and the second cooling device 26 is positioned below the fuel cell 22. Therefore, at least one of the first cooling device 25 and the second cooling device 26 is not aligned with the fuel cell 22 in the front-to-back direction, and thus the vehicle can be made more compact in the front-to-back direction.

[0295] (Item 1-4) The work vehicle 1 according to any one of Items 1-1 to 1-3, wherein the fuel cell 22 is arranged alongside the hydrogen tank 21 in the front-rear direction of the vehicle body 5, and at least one of the first cooling device 25 and the second cooling device 26 is arranged between the hydrogen tank 21 and the fuel cell 22.

[0296] According to the work vehicle 1 of item 1-4, at least one of the first cooling device 25 and the second cooling device 26 is positioned between the hydrogen tank 21 and the fuel cell 22, thus enabling effective use of the space between the hydrogen tank 21 and the fuel cell 22.

[0297] (Item 1-5) The first cooling device 25 and the second cooling device 26 are arranged side by side in the vertical direction in the work vehicle 1 described in any one of Items 1-1 to 1-4.

[0298] According to the work vehicle 1 of item 1-5, the first cooling device 25 and the second cooling device 26 are arranged side by side in the vertical direction, so the vehicle can be made more compact in the front-to-back direction compared to when the first cooling device 25 and the second cooling device 26 are arranged side by side in the front-to-back direction.

[0299] (Item 1-6) The work vehicle 1 according to any one of Items 1-1 to 1-5, wherein the first cooling device 25 is located behind the hydrogen tank 21 in the longitudinal direction of the vehicle body 5, and the second cooling device 26 is located in front of the hydrogen tank 21 in the longitudinal direction of the vehicle body 5.

[0300] According to the work vehicle 1 of item 1-6, the first cooling device 25 is positioned behind the hydrogen tank 21 in the longitudinal direction of the vehicle body 5, and the second cooling device 26 is positioned in front of the hydrogen tank 21 in the longitudinal direction of the vehicle body 5. Therefore, the first cooling device 25 and the second cooling device 26 are positioned at a distance from each other. This prevents the first cooling device 25 and the second cooling device 26 from influencing each other's heat.

[0301] (Item 1-7) The fuel cell 22 is positioned behind the hydrogen tank 21 in the front-rear direction of the vehicle body 5, as described in any one of Items 1-1 to 1-6 of the work vehicle 1.

[0302] According to the work vehicle 1 of item 1-7, the fuel cell 22 is positioned behind the hydrogen tank 21 in the longitudinal direction of the vehicle body 5, thereby improving driving stability. In other words, since the fuel cell 22 is generally heavier than the hydrogen tank 21, positioning it behind the hydrogen tank 21 creates a rear load, improving driving stability.

[0303] (Item 2-1: Second Invention) A work vehicle 1 comprising: a vehicle body 5; a pair of front running devices 6F, 6F provided on both sides of the front of the vehicle body 5 in the front-rear direction; a pair of rear running devices 6R, 6R provided on both sides of the rear of the vehicle body 5 in the front-rear direction; a hydrogen tank 21 provided on the vehicle body 5 for storing hydrogen; a fuel cell 22 provided on the vehicle body 5 for generating electricity using hydrogen supplied from the hydrogen tank 21; and a first cooling device 25 for cooling at least one of the hydrogen tank 21 and the fuel cell 22, wherein the first cooling device 25 is positioned between the pair of rear running devices 6R, 6R.

[0304] According to the work vehicle 1 of item 2-1, the first cooling device 25 is positioned between the pair of rear running gears 6R, 6R, so the first cooling device 25 is positioned in an appropriate location that does not protrude from the width of the vehicle and does not interfere with the pair of rear running gears 6R, 6R.

[0305] (Item 2-2) The work vehicle 1 described in Item 2-1, comprising equipment EM (EM1, EM2, EM3) that receives electricity generated by the fuel cell 22, and a second cooling device 26 that cools the equipment EM (EM1, EM2, EM3), wherein the second cooling device 26 is positioned between the pair of rear running devices 6R, 6R.

[0306] According to the work vehicle 1 of item 2-2, in addition to the first cooling device 25, the second cooling device 26 is also positioned between the pair of rear running gears 6R, 6R. Therefore, both the first cooling device 25 and the second cooling device 26 are positioned in an appropriate location without protruding beyond the width of the vehicle or interfering with the pair of rear running gears 6R, 6R.

[0307] (Item 2-3) The work vehicle 1 described in Item 2-2, wherein both the first cooling device 25 and the second cooling device 26 are located behind the hydrogen tank 21 in the longitudinal direction of the vehicle body 5.

[0308] According to the work vehicle 1 of item 2-3, both the first cooling device 25 and the second cooling device 26 are positioned behind the hydrogen tank 21 in the longitudinal direction of the vehicle body 5. Therefore, the first cooling device 25 and the second cooling device 26 are positioned appropriately, taking into account the arrangement of the hydrogen tank 21 and the fuel cell 22.

[0309] (Item 2-4) The work vehicle 1 according to Item 2-2 or Item 2-3, wherein both the first cooling device 25 and the second cooling device 26 are located below the fuel cell 22.

[0310] According to the work vehicle 1 of item 2-4, both the first cooling device 25 and the second cooling device 26 are positioned below the fuel cell 22. Therefore, the first cooling device 25 and the second cooling device 26 are positioned in a more appropriate location, taking into account the arrangement of the hydrogen tank 21 and the fuel cell 22.

[0311] (Item 2-5) The work vehicle 1 described in Item 2-2, wherein the fuel cell 22 is arranged alongside the hydrogen tank 21 in the front-rear direction of the vehicle body 5, and both the first cooling device 25 and the second cooling device 26 are arranged between the hydrogen tank 21 and the fuel cell 22.

[0312] According to the work vehicle 1 of item 2-5, both the first cooling device 25 and the second cooling device 26 are positioned between the hydrogen tank 21 and the fuel cell 22, thus allowing for effective use of the space between the hydrogen tank 21 and the fuel cell 22.

[0313] (Item 2-6) The first cooling device 25 and the second cooling device 26 are arranged side by side in the vertical direction in the work vehicle 1 described in any one of Items 2-2 to 2-5.

[0314] According to the work vehicle 1 of item 2-6, the first cooling device 25 and the second cooling device 26 are arranged side by side in the vertical direction, so the vehicle can be made more compact in the front-to-back direction compared to when the first cooling device 25 and the second cooling device 26 are arranged side by side in the front-to-back direction.

[0315] (Item 3-1: Third Invention) A work vehicle 1 comprising a vehicle body 5, a front running gear 6F supported by the vehicle body 5, a rear running gear 6R supported by the vehicle body 5, a hydrogen tank 21 for storing hydrogen, a fuel cell 22 that generates electricity using hydrogen supplied from the hydrogen tank 21, equipment EM (EM1, EM2, EM3) for receiving electricity generated by the fuel cell 22, a first cooling device 25 for cooling at least one of the hydrogen tank 21 and the fuel cell 22, and a second cooling device 26 for cooling the equipment EM (EM1, EM2, EM3), wherein the fuel cell 22 is provided at the front of the vehicle body 5 in the longitudinal direction, the hydrogen tank 21 is provided at the rear of the vehicle body 5 in the longitudinal direction, and at least one of the first cooling device 25 and the second cooling device 26 is provided in front of the hydrogen tank 21 in the longitudinal direction of the vehicle body 5.

[0316] According to the work vehicle 1 of item 3-1, the fuel cell 22 is provided at the front of the vehicle body 5 in the longitudinal direction, the hydrogen tank 21 is provided at the rear of the vehicle body 5 in the longitudinal direction, and at least one of the first cooling device 25 and the second cooling device 26 is provided in front of the hydrogen tank 21 in the longitudinal direction of the vehicle body 5. Therefore, taking into account the hydrogen tank 21 and the fuel cell 22, at least one of the first cooling device 25 and the second cooling device 26 is positioned appropriately.

[0317] (Item 3-2) The work vehicle 1 according to Item 3-1, wherein at least one of the first cooling device 25 and the second cooling device 26 is positioned behind the fuel cell 22 in the longitudinal direction of the vehicle body 5.

[0318] According to the work vehicle 1 of item 3-2, at least one of the first cooling device 25 and the second cooling device 26 is positioned behind the fuel cell 22 in the longitudinal direction of the vehicle body 5. Therefore, taking into account the hydrogen tank 21 and the fuel cell 22, at least one of the first cooling device 25 and the second cooling device 26 is positioned in the appropriate location.

[0319] (Item 3-3) The work vehicle 1 according to Item 3-2, wherein at least one of the first cooling device 25 and the second cooling device 26 is positioned in front of the fuel cell 22 in the longitudinal direction of the vehicle body 5.

[0320] According to the work vehicle 1 of item 3-3, at least one of the first cooling device 25 and the second cooling device 26 is positioned in front of the fuel cell 22 in the longitudinal direction of the vehicle body 5. Therefore, taking into account the hydrogen tank 21 and the fuel cell 22, at least one of the first cooling device 25 and the second cooling device 26 is positioned in the appropriate location.

[0321] (Item 3-4) The work vehicle 1 according to Item 3-2, wherein at least one of the first cooling device 25 and the second cooling device 26 is located below the fuel cell 22.

[0322] According to the work vehicle 1 of item 3-4, at least one of the first cooling device 25 and the second cooling device 26 is positioned below the fuel cell 22. Therefore, at least one of the first cooling device 25 and the second cooling device 26 is not aligned with the fuel cell 22 in the front-to-back direction, and thus the vehicle can be made more compact in the front-to-back direction.

[0323] (Item 3-5) At least one of the first cooling device 25 and the second cooling device 26 is positioned between the hydrogen tank 21 and the fuel cell 22 in the work vehicle 1 as described in Item 3-2.

[0324] According to the work vehicle 1 of item 3-5, at least one of the first cooling device 25 and the second cooling device 26 is positioned between the hydrogen tank 21 and the fuel cell 22, thus making effective use of the space between the hydrogen tank 21 and the fuel cell 22.

[0325] (Item 3-6) The first cooling device 25 and the second cooling device 26 are arranged side by side in the vertical direction in the work vehicle 1 described in Item 3-2.

[0326] According to the work vehicle 1 of item 3-6, the first cooling device 25 and the second cooling device 26 are arranged side by side in the vertical direction, so the vehicle can be made more compact in the front-to-back direction compared to when the first cooling device 25 and the second cooling device 26 are arranged side by side in the front-to-back direction.

[0327] (Item 3-7) The equipment EM (EM1, EM2, EM3) is the work vehicle 1 described in Item 3-1, which is positioned below the fuel cell 22.

[0328] According to the work vehicle 1 of item 3-7, since the equipment EM (EM1, EM2, EM3) is positioned below the fuel cell 22, the equipment EM (EM1, EM2, EM3) is not positioned side-by-side with the fuel cell 22, and the size in the front-to-back or side-to-side direction can be made more compact.

[0329] (Item 3-8) The work vehicle 1 according to Item 3-1, wherein the equipment EM is at least one of the inverter EM1, the converter EM2, and the energy storage device 24.

[0330] According to the work vehicle 1 of item 3-8, at least one of the equipment EMs, namely the inverter EM1, the converter EM2, and the energy storage device 24, can be properly cooled by the second cooling device 26, thereby suppressing the occurrence of malfunctions of the electrical components EM1, EM2, and EM3.

[0331] 1: Work vehicle (agricultural tractor) 2: Vehicle body 3: First bonnet 4: Second bonnet 5: Body 6F: Front running gear 6R: Rear running gear 7: Element support mechanism 8: Control device 9: Support frame 21: Hydrogen tank 22: Fuel cell 24: Energy storage device 25: First cooling device 26: Second cooling device 44: Ventilation opening 50: Body frame 51: Gear case 60F: Front wheels (wheels, front wheels) 60R: Rear wheels (wheels, rear wheels) 511: Axle (rear axle) 522: Axle (front axle) 906: Equipment layout EM: Equipment (equipped equipment) EM1: Electrical components (inverter) EM2: Electrical components (converter) EM3 : Electrical components (junction box) M1: Motor (first motor) M2: Motor (second motor) SP: Lower space WE: Work input

Claims

1. A work vehicle comprising: a vehicle body; a hydrogen tank provided at the front of the vehicle body for storing hydrogen; a fuel cell provided on the vehicle body for generating electricity using hydrogen supplied from the hydrogen tank; equipment for receiving the electricity generated by the fuel cell; a first cooling device for cooling at least one of the hydrogen tank and the fuel cell; and a second cooling device for cooling the equipment, wherein at least one of the first cooling device and the second cooling device is positioned behind the hydrogen tank in the longitudinal direction of the vehicle body.

2. The work vehicle according to claim 1, wherein the fuel cell is arranged alongside the hydrogen tank in the longitudinal direction of the vehicle body, and at least one of the first cooling device and the second cooling device is arranged behind the fuel cell in the longitudinal direction of the vehicle body.

3. The work vehicle according to claim 1, wherein the fuel cell is arranged alongside the hydrogen tank in the longitudinal direction of the vehicle body, and at least one of the first cooling device and the second cooling device is arranged below the fuel cell.

4. The work vehicle according to claim 1, wherein the fuel cell is arranged alongside the hydrogen tank in the longitudinal direction of the vehicle body, and at least one of the first cooling device and the second cooling device is arranged between the hydrogen tank and the fuel cell.

5. The work vehicle according to claim 1, wherein the first cooling device and the second cooling device are arranged side by side in the vertical direction.

6. The work vehicle according to claim 1, wherein the first cooling device is located behind the hydrogen tank in the longitudinal direction of the vehicle body, and the second cooling device is located in front of the hydrogen tank in the longitudinal direction of the vehicle body.

7. The work vehicle according to claim 1, wherein the fuel cell is positioned behind the hydrogen tank in the front-rear direction of the vehicle body.

8. A work vehicle comprising: a vehicle body; a pair of front running gears provided on both sides of the front of the vehicle body in the longitudinal direction; a pair of rear running gears provided on both sides of the rear of the vehicle body in the longitudinal direction; a hydrogen tank provided on the vehicle body for storing hydrogen; a fuel cell provided on the vehicle body for generating electricity using hydrogen supplied from the hydrogen tank; and a first cooling device for cooling at least one of the hydrogen tank and the fuel cell, wherein the first cooling device is positioned between the pair of rear running gears.

9. The work vehicle according to claim 8, further comprising: equipment for receiving electricity generated by the fuel cell; and a second cooling device for cooling the equipment, wherein the second cooling device is positioned between the pair of rear running gears.

10. The work vehicle according to claim 9, wherein both the first cooling device and the second cooling device are positioned behind the hydrogen tank in the longitudinal direction of the vehicle body.

11. The work vehicle according to claim 9, wherein both the first cooling device and the second cooling device are positioned below the fuel cell.

12. The work vehicle according to claim 9, wherein the fuel cell is arranged alongside the hydrogen tank in the longitudinal direction of the vehicle body, and both the first cooling device and the second cooling device are arranged between the hydrogen tank and the fuel cell.

13. The work vehicle according to claim 9, wherein the first cooling device and the second cooling device are arranged side by side in the vertical direction.

14. A work vehicle comprising: a vehicle body; a front running gear supported by the vehicle body; a rear running gear supported by the vehicle body; a hydrogen tank for storing hydrogen; a fuel cell for generating electricity using hydrogen supplied from the hydrogen tank; equipment for receiving the electricity generated by the fuel cell; a first cooling device for cooling at least one of the hydrogen tank and the fuel cell; and a second cooling device for cooling the equipment, wherein the fuel cell is provided at the front of the vehicle body in the longitudinal direction; the hydrogen tank is provided at the rear of the vehicle body in the longitudinal direction; and at least one of the first cooling device and the second cooling device is provided in front of the hydrogen tank in the longitudinal direction of the vehicle body.

15. The work vehicle according to claim 14, wherein at least one of the first cooling device and the second cooling device is positioned behind the fuel cell in the longitudinal direction of the vehicle body.

16. The work vehicle according to claim 15, wherein at least one of the first cooling device and the second cooling device is positioned in front of the fuel cell in the longitudinal direction of the vehicle body.

17. The work vehicle according to claim 15, wherein at least one of the first cooling device and the second cooling device is positioned below the fuel cell.

18. The work vehicle according to claim 15, wherein at least one of the first cooling device and the second cooling device is disposed between the hydrogen tank and the fuel cell.

19. The work vehicle according to claim 15, wherein the first cooling device and the second cooling device are arranged side by side in the vertical direction.

20. The work vehicle according to claim 14, wherein the equipment is positioned below the fuel cell.

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