Work vehicles

Abstract

The present invention provides a work vehicle in which a cooling device is positioned appropriately. [Solution] 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.

Description

Technical Field

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

Background Art

[0002] Conventionally, work vehicles such as tractors are provided with a hydrogen tank for storing hydrogen, a fuel cell that generates electricity using 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 (for example, see Patent Document 1). This type of work vehicle includes a cooling device that cools at least one of the hydrogen tank and the fuel cell.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

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

[0005] Therefore, an object of the present invention is to provide a work vehicle in which the cooling device is arranged at an appropriate position.

Means for Solving the Problems

[0006] The work vehicle 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.

[0007] In one aspect of the present invention, the work vehicle comprises equipment for receiving electricity generated by the fuel cell and a second cooling device for cooling the equipment, wherein the second cooling device may be positioned between the pair of rear running gears.

[0008] Both the first cooling device and the second cooling device may be positioned behind the hydrogen tank in the longitudinal direction of the vehicle body.

[0009] Both the first cooling device and the second cooling device may be positioned below the fuel cell.

[0010] 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 may be arranged between the hydrogen tank and the fuel cell.

[0011] The first cooling device and the second cooling device may be arranged side by side in the vertical direction. [Effects of the Invention]

[0012] According to the present invention, the cooling device is positioned in an appropriate location. [Brief explanation of the drawing]

[0013] [Figure 1] Figure 1 is a left side view of a work vehicle according to one embodiment of the present invention. [Figure 2] Figure 2 is a front view of the work vehicle according to the same embodiment. [Figure 3] Figure 3 is a rear view of the work vehicle of the present embodiment. [Figure 4] Figure 4 is a plan view of the work vehicle of the present embodiment. [Figure 5] Figure 5 is a partial perspective view of the work vehicle of the present embodiment, showing a state where the support frame is assembled to the vehicle body frame and the gear case. [Figure 6] Figure 6 is a partial exploded perspective view of the work vehicle of the present embodiment, showing a state where the support frame is removed from the vehicle body frame and the gear case. [Figure 7] Figure 7 is a partial perspective view of the work vehicle of the present embodiment, showing a perspective view of a state where the vehicle body frame and the gear case are assembled. [Figure 8] Figure 8 is a partial plan view of the work vehicle of the present embodiment, showing a partial plan view of a state where the vehicle body frame and the gear case are assembled. [Figure 9] Figure 9 is a schematic perspective view of the first bonnet of the work vehicle of the present embodiment. [Figure 10] Figure 10 is a schematic perspective view of the second bonnet of the work vehicle of the present embodiment as seen from the front right obliquely. [Figure 11] Figure 11 is a schematic perspective view of the second bonnet of the work vehicle of the present embodiment as seen from the rear left obliquely. [Figure 12] Figure 12 is a schematic cross-sectional view of the power storage device of the work vehicle of the present embodiment. [Figure 13] Figure 13 is a schematic exploded perspective view of the first cooling device of the work vehicle of the present embodiment. [Figure 14] Figure 14 is a schematic diagram of the circulation path including the first cooling device of the work vehicle of the present embodiment. [Figure 15] Figure 15 is a schematic exploded perspective view of the second cooling device of the work vehicle of the present embodiment. [Figure 16] Figure 16 is a schematic diagram of the circulation path including the second cooling device of the work vehicle of the present embodiment. [Figure 17] Figure 17 is a schematic block diagram of the control device of the work vehicle of the present embodiment. [Figure 18] Figure 18 is an overall perspective view of the support frame of the work vehicle according to this embodiment. [Figure 19] Figure 19 is a schematic plan view of the support frame of the work vehicle according to this embodiment. [Figure 20] Figure 20 is a left side view of the support frame of the work vehicle according to this embodiment. [Figure 21] Figure 21 is a left side view of the work vehicle according to another embodiment of the present invention. [Figure 22] Figure 22 is a left side view of the work vehicle according to another embodiment of the present invention. [Figure 23] Figure 23 is a left side view of the work vehicle according to yet another embodiment of the present invention. [Figure 24] Figure 24 is a plan view of the work vehicle shown in Figure 23. [Figure 25] Figure 25 is a left side view of the work vehicle according to yet another embodiment of the present invention. [Figure 26] Figure 26 is a plan view of the work vehicle shown in Figure 25. [Figure 27] Figure 27 is a left side view of the work vehicle according to yet another embodiment of the present invention. [Figure 28] Figure 28 is a plan view of the work vehicle shown in Figure 27. [Figure 29] Figure 29 is a left side view of the work vehicle according to yet another embodiment of the present invention. [Figure 30] Figure 30 is a plan view of the work vehicle shown in Figure 29. [Figure 31] Figure 31 is a left side view of the work vehicle according to yet another embodiment of the present invention. [Figure 32] Figure 32 is a plan view of the work vehicle shown in Figure 31.

Embodiments for Carrying Out the Invention

[0014] The following description will explain a work vehicle according to one embodiment of the present invention with reference to the drawings. The work vehicle of this embodiment is drivable. Based on this, 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.

[0015] 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.

[0016] In other words, the work vehicle 1 comprises a body 5, a pair of front running gears 6F, 6F provided on both sides of the front of the body 5 in the longitudinal direction, and a pair of rear running gears 6R, 6R provided on both sides of the rear of the body 5 in the longitudinal direction. The work vehicle 1 also comprises a first bonnet 3 and a second bonnet 4 positioned on the body 5 (vehicle body 2).

[0017] The work vehicle 1 of this 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 this 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 this embodiment includes a cooling device 26 (hereinafter referred to as the second cooling device 26) for cooling the equipped equipment EM.

[0018] In this embodiment, the work vehicle 1 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).

[0019] Furthermore, the work vehicle 1 of this embodiment is an unmanned tractor that operates automatically according to a preset program, or is remotely operated by remote control. In this 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.

[0020] 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 this embodiment, the gear case 51 is positioned behind the vehicle body frame 50.

[0021] 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).

[0022] 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.

[0023] In this 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, and They stand upright in the downward direction and extend in the front-to-back 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-to-back direction of the vehicle body 5. The pair of side walls 501, 501 face each other with a gap between them in the lateral direction.

[0024] 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 this embodiment, the vehicle frame 50 (vehicle body 5) has a first side wall connecting portion 502 that connects the lower ends of the pair of side walls 501, 501 together, and a second side wall connecting portion 503 that connects the front ends (the ends on the front-rear side in the front-rear direction) and the rear ends (the ends on the rear-rear side in the front-rear direction) of the pair of side walls 501, 501 together.

[0025] 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.

[0026] The pair of locking pieces 504, 504 are provided in the area where the energy storage devices 24... are arranged. In this embodiment, multiple energy storage devices 24... are arranged side by side 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....

[0027] 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 this 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 this embodiment, the front wheel 60F and the rear wheel 60R are wheels 60F, 60R that come into contact with the ground and roll when the vehicle body 5 is running. More specifically, the front wheel 60F, 60F and the rear wheel 60R, 60R in this 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.

[0028] 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.

[0029] 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.

[0030] In this embodiment, the steering mechanism is a hydraulic mechanism. In this 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 longitudinal direction into rotation around an axis that extends in the lateral direction and transmits it to both sides in the lateral direction.

[0031] 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 this embodiment, the pair of front wheels 60F, 60F are steerable and drivable.

[0032] The steering case 521 is connected to the vehicle frame 50, and a pair of front axles 522, 522 and a pair of steering knuckles 520, 520 are positioned laterally on both sides of the vehicle body 5 (vehicle frame 50). Accordingly, a 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) comprises a pair of front axles 522, 522 positioned laterally (left and right) on both sides of the vehicle body 5, each to which a wheel 60F (front wheel 60F) is connected, and a pair of front axles 522, 522 that rotate around an axis extending laterally.

[0033] In this 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 this 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 this 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.

[0034] 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.

[0035] Specifically, the rear wheel distribution mechanism consists of a pair of output axles (hereinafter referred to as rear axles 511, 511) that are spaced apart laterally, and which rotate around an axis extending laterally under the drive of 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).

[0036] 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.

[0037] In this embodiment, the rear wheel distribution mechanism has an output shaft extending forward in the longitudinal direction, separate from the pair of rear axles 511, 511. The output shaft has a drive shaft extending in the longitudinal direction. The drive shaft DS is connected to the front wheel distribution mechanism. 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 this 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 this embodiment is four-wheel drive.

[0038] 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.

[0039] The first bonnet 3 and the second bonnet 4 are positioned according to the arrangement of the hydrogen tank 21, fuel cell 22, first cooling device 25, and second cooling device 26. In this embodiment, the first bonnet 3 and the second bonnet 4 are aligned in the front-to-rear direction on the vehicle body 5. In this embodiment, the second bonnet 4 is positioned rearward relative to the first bonnet 3.

[0040] The first bonnet 3 is positioned between the pair of front wheels 60F, 60F. In contrast, the second bonnet 4 is positioned between the pair of rear wheels 60R, 60R.

[0041] In this embodiment, the work vehicle 1 is equipped with multiple hydrogen tanks 21..., and the multiple 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 multiple hydrogen tanks 21... held by the tank holder 23.

[0042] More specifically, as shown in Figure 9, 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 laterally 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.

[0043] 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 this 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 front wheels 60F, 60F, the total length of the first bonnet 3 in the lateral direction is set to be shorter than the distance 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 to be longer (higher) than the total length (height) of the tank holder 23 in the vertical direction.

[0044] The first bonnet 3 is supported by the support frame 9 (support plate 920) while covering the hydrogen tanks 21…(tank holders 23) on the support frame 9 (vehicle body 5).

[0045] The entirety of the first bonnet 3 is openable and closable. Specifically, the entire first bonnet 3 is part of the vehicle body. It is detachable from 5, and can be switched 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.

[0046] As shown in Figure 4, the second bonnet 4 is positioned between the pair of rear wheels 60R, 60R. That is, in a plan view, the second bonnet 4 is positioned between the pair of rear wheels 60R, 60R. Furthermore, when viewed from the side, the second bonnet 4 is positioned above the rear wheels 60R. In this embodiment, as shown in Figures 10 and 11, the second bonnet 4 has vents 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.

[0047] 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 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.

[0048] 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 rear wheels 60R, 60R.

[0049] 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.

[0050] The peripheral wall of the second bonnet 4 is provided with ventilation openings 44 that connect the inside and outside. In this 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.

[0051] 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.

[0052] 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 this embodiment, the hydrogen tank 21 is located on the first support part 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 this 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 this 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 210 and a pair of end caps 211, 211 that close both ends of the body 210, as shown in Figure 1. 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 this 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 this 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 this 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.

[0053] In this embodiment, each of the four hydrogen tanks 21... is arranged with the centerline of the body 210 extending in the front-rear direction. One end 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 211. Piping that leads to the fuel cell 22 is connected to the on / off valve. This makes it possible to switch the supply of hydrogen from the hydrogen tanks 21... to the fuel cell 22 on and off by opening and closing the on / off valve. That is, one end of the hydrogen tank 21 in the longitudinal direction (one end 211) is connected to piping for extracting hydrogen, which leads to the fuel cell 22. In this 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.

[0054] The work vehicle 1 is equipped with a tank holder 23 that holds multiple hydrogen tanks 21... Specifically, since the work vehicle 1 of this embodiment has multiple (four) hydrogen tanks 21..., it 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 this embodiment, since the hydrogen tanks 21... are arranged in a 2x2 configuration when viewed from the front, the tank holder 23 holds the four hydrogen tanks 21... in a 2x2 configuration.

[0055] The fuel cell 22 is installed in the vehicle body 5. In this embodiment, the fuel cell 22 is installed in the rear area of ​​the vehicle body 5 in the longitudinal 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 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 this 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.

[0056] The energy storage device 24... is a rechargeable secondary battery. In this embodiment, the energy storage device 24... is a battery pack including a plurality of battery modules BM electrically connected in series, as shown in Figure 12. Each battery module BM includes a plurality of battery cells electrically connected in series. In this 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 this 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 this 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...

[0057] In this embodiment, all or part (in this 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....

[0058] More specifically, in this 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 is T-shaped. 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). That is, 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.

[0059] The first part 241, the second part 242, and the third part 243 are each formed in a box shape and, when viewed from the front-to-back direction, each exhibit a rectangular shape.

[0060] The external dimensions of the first part 241 in the lateral direction are set to be smaller than the distance (internal dimension) between the pair of side walls 501, 501. In other words, the external dimensions of the first part 241 are set to be such that it can be inserted between the pair of side walls 501, 501. The lengths of the first part 241, the second part 242, and the third part 243 in the front-to-back direction are set to be the same, and both front-to-back surfaces of the first part 241, the second part 242, and the third part 243 are positioned on the same plane.

[0061] 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.

[0062] In this 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.

[0063] 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 this 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.

[0064] In this embodiment, the first section 241 houses a plurality of battery modules BM... The plurality of battery modules BM... are stacked vertically within the first section 241.

[0065] In this embodiment, the first portion 241 houses two battery module groups G arranged horizontally, each consisting of multiple battery modules BM stacked vertically within the first portion 241.

[0066] 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) connected to the outside is connected to the other opening provided on either the front or rear surface of the first section 241.

[0067] As a result, in the energy storage device 24…(battery pack) 24 of this embodiment, the cooling air from the third section 243 flows into the first section 241 from either the front or rear surface of the first section 241, and then circulates within the first section 241 in the front-to-back direction, cooling the battery module BM inside the first section 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 section 241.

[0068] As described above, in this embodiment, the energy storage device 24... has the first part 241 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.

[0069] 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.

[0070] Multiple energy storage devices 24... are electrically connected in series, and the terminals at the upstream and downstream 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 this embodiment, when the fuel cell 22 is generating electricity, it is also possible to supply power from the fuel cell 22 to the first motor M1. That is, the first motor M1 rotates by receiving power from the fuel cell 22.

[0071] The work vehicle 1 of this embodiment is equipped with a first cooling device 25. The first cooling device 25 is a ventilated cooling device. In this 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.

[0072] In this 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.

[0073] 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 fin Fa.

[0074] Each of the multiple heat dissipation fins Fa... is formed in the shape of a strip (or rectangular strip), and they are stacked with their 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 this embodiment, the multiple heat dissipation fins Fa... are stacked in a direction perpendicular to the vertical direction.

[0075] 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 this 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 where air is drawn in, 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 where air is discharged. 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 the multiple heat dissipation fins Fa... in the short direction constitutes the intake section 250a, and the other end of the multiple heat dissipation fins Fa... in the short direction constitutes the exhaust section 250b.

[0076] 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 multiple semicircular bent pipe sections Pa2, each of which connects the ends of two adjacent straight pipe sections Pa1, Pa1, forming a curved flow path.

[0077] 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 this 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 this 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.

[0078] In this embodiment, the first cooling device 25 is supported by the 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.

[0079] In this embodiment, the fuel cell 22 is liquid-cooled, and overheating is prevented by circulating the 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.

[0080] 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 (in this embodiment, the fuel cell 22). That is, the first cooling device 25 is located 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 (in this embodiment, the fuel cell 22) at intermediate positions. In other words, the pipe Pa of the first cooling device 25 is connected to a pipe 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.

[0081] In the first cooling device 25 with the above configuration, the liquid, 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. As a result, 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.

[0082] The work vehicle 1 of this 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. These equipment EM (EM1, EM2, EM3, M1, M2, 24) include: Although liquid-cooled versions exist, in this embodiment, among these equipment EMs, the inverter EM1, converter EM2, and junction box EM3, which are electrical components, will be described as examples of liquid-cooled versions. 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.

[0083] 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 face-to-face with adjacent heat dissipation fins Fb.

[0084] 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.

[0085] 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 this 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 where air is drawn in, 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 where air is discharged. 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 an intake section 260a, and the other end of the multiple heat dissipation fins Fb... in the short direction constitutes an exhaust section 260b.

[0086] 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 semi-circular bent pipe sections Pb2, each of which connects the ends of two adjacent straight pipe sections Pb1,Pb1, forming a curved flow path.

[0087] 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 this 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 this 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.

[0088] In this embodiment, the multiple (two in this 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.

[0089] In this 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 will overheat.

[0090] 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, 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, 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.

[0091] 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 overheating. 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 is configured to flow 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 this embodiment, a single circulation path CR2 (second cooling device 26) cools multiple electrical components EM1, EM2, and EM3.

[0092] 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 this 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 this 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 this 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.

[0093] 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.

[0094] The impulse support mechanism 7 is a well-known three-point linkage mechanism, so its explanation is omitted here.

[0095] 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).

[0096] As shown in Figure 17, the control device 8 includes 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 an external source, switches, sensing devices SE1, SE2, etc. (described later), and the electric motor to be controlled (first motor M The control device 8 includes an output unit 83 that outputs control signals to the motor 1, the second motor M2, the actuator, etc. The control device 8 generates control signals for controlling each part of the work vehicle 1 based on the input signals input from the input unit 82 and the information stored in the storage unit 81, and outputs them to each part to be controlled.

[0097] 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 this 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).

[0098] As shown in Figure 1, the hydrogen tank 21, fuel cell 22, first cooling system 25, and second cooling system 26 are mounted on the vehicle body 5. That is, the hydrogen tank 21, fuel cell 22, first cooling system 25, and second cooling system 26 are directly or indirectly supported by the vehicle body 5.

[0099] The work vehicle 1 of this 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.

[0100] 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 the fuel cell 22 are positioned (mounted) on the support frame 9 directly or indirectly. In this 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.

[0101] 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 this 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.

[0102] In this embodiment, 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.

[0103] More specifically, the support frame 9 is provided on the vehicle body 5, and the total length of the support frame 9 in the longitudinal direction is set to be greater than or equal to the total length of the vehicle body 5 in the longitudinal 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 this 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. Furthermore, the second support section 90B supports the electrical components EM1, EM2, and EM3 among the equipped equipment EM.

[0104] The first support section 90A and the second support section 90B are aligned in the front-rear direction. In this embodiment, the second support section 90B is located behind the first support section 90A in the front-rear direction. In this embodiment, the second support section 90B is configured to support the fuel cell 22 and the first cooling device 25 above the support position of the hydrogen tanks 21... by the first support section 90A. The support section 90B is configured to support the second cooling device 26 below the first cooling device 25 (fuel cell 22). Furthermore, the second support section 90B is configured to support the inverter EM1, converter EM2, and junction box EM3, which are among the equipped equipment EM, below the first cooling device 25 (fuel cell 22).

[0105] 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 this embodiment includes a support plate 920 arranged on the first support section 90A, the upper surface of which constitutes a first support surface S1 on which hydrogen tanks 21... (tank holders 23) are arranged.

[0106] 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 this 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 front-to-back length of the hydrogen tank 21 (tank holder 23).

[0107] 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 spaced apart in the front-rear direction.

[0108] In this 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 in this 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.

[0109] 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 (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).

[0110] In this 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 this 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 section 90A that supports the hydrogen tanks 21..., and the rear region 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.

[0111] In this 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 such that the hydrogen tank 21 in the first support portion 90A…( It is set at a position higher than the support position (referred to as the first support surface S1) of the tank holder 23) and the fuel cell 22.

[0112] 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 this 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….

[0113] The outer casing of the equipment placement section 906 is formed in a rectangular (approximately square) shape. In this 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 this 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.

[0114] 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).

[0115] 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.

[0116] Furthermore, since the second cooling device 26 is located in the lower space SP, it is positioned below the fuel cell 22. In this 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 part 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.

[0117] As shown in Figure 4, the sensing devices SE1 and SE2 are arranged at multiple locations (four locations in this 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 this 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. Either one, or a combination of a camera and a lidar. In this embodiment, each of the multiple sensing devices SE1 and SE2 is the same camera. In this embodiment, each of the multiple sensing devices SE1 and SE2 can be a wide-angle camera, a 360° camera, etc., and in this embodiment, each of the multiple sensing devices SE1 and SE2 is a wide-angle camera.

[0118] 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 this 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.

[0119] More specifically, the work vehicle 1 of this embodiment is equipped with four sensing devices SE1, SE2. One of the four sensing devices SE1, SE2, 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, SE2, two 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.

[0120] In this way, 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. Therefore, 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). In addition, 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).

[0121] The work vehicle 1 (agricultural tractor 1) of this 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 in relation to the front-to-rear arrangement of the hydrogen tank and fuel cell.

[0122] In particular, since the first cooling unit 25 and the second cooling unit 26 are positioned between the pair of rear running gears 6R, 6R, the first cooling unit 25 and the second cooling unit 26 are positioned appropriately without protruding beyond the width of the vehicle or interfering with the pair of rear running gears 6R, 6R.

[0123] 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 used effectively.

[0124] Furthermore, since the first cooling device 25 and the second cooling device 26 are arranged side by side in the vertical direction, the design 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.

[0125] It should be noted that the present invention is not limited to the embodiments described above, and can be modified as appropriate without departing from the spirit of the invention.

[0126] In the above embodiment, the front running gears 6F, 6F are equipped with front wheels 60F, 60F, and these front wheels 60F, 60F are tire wheels (front wheels), and the rear running gears 6R, 6R are equipped with rear wheels 60R, 60R, and these rear wheels 60R, 60R are tire wheels (rear wheels). However, it 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 on the front wheels 60F,60F of the front running gear 6F,6F and crawler devices (endless track running gear) are used on the rear running gear 6R,6R. In this case, the rear wheels 60R,60R are the wheels furthest to the rear in the longitudinal direction among the multiple wheels (sprockets (drive wheels), idlers (guide wheels)) around which the endless annular track belt (crawler belt) is wrapped. Conversely, it may also be a half-crawler type in which tire wheels are used on the rear wheels 60R,60R of the rear running gear 6R,6R and crawler devices (endless track running gear) are used on the front running gear 6F,6F. In this case, among the multiple wheels (sprockets (drive wheels), idlers (support wheels)) around which the endlessly ring-shaped track belt (crawler belt) is wrapped, the wheel furthest forward in the longitudinal direction is the front wheel 60F, 60F.

[0127] 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.

[0128] In the above 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 to this. 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 in a front-to-back direction, 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.

[0129] 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.

[0130] In the above 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.

[0131] 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 arrangement of the first cooling device 25 and the second cooling device 26 It is also perfectly acceptable to swap the arrangement of the cooling device 26.

[0132] 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. Also, 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.

[0133] In the above 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.

[0134] In the above embodiment, only the second cooling device 26 is 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). That is, at least one of the first cooling device 25 and the second cooling device 26 may be positioned below the fuel cell 22.

[0135] In the above 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)).

[0136] In the above embodiment, an agricultural tractor was described as an example of a 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.

[0137] In the above embodiment, a work vehicle 1 equipped with four hydrogen tanks 21, arranged vertically and horizontally (in a 2x2 configuration), was described, but the invention is not limited to this configuration. 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.

[0138] In the above embodiment, the first bonnet 3 covers the hydrogen tank 21, and the second bonnet 4 covers 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 longitudinal direction) and the first cooling device 25 is located at the rear of the vehicle body 5 (rear side in the longitudinal 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.

[0139] In the above 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 at a higher position than the upper end of the first support portion 90A (the first support surface S1), but this 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).

[0140] Furthermore, in the above 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.

[0141] In the above embodiment, cameras were used for the sensing devices SE1 and SE2, but the system is not limited to this. For example, various types of sensors can be used for the sensing devices SE1 and SE2. For instance, 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; multiple types of sensors may be used and mounted on the work vehicle 1 (vehicle body 2 (vehicle 5)).

[0142] In the above 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.

[0143] In the above 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 embodiment 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.

[0144] 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 also allows access to the interior of the second bonnet 4, enabling maintenance and inspection of the equipped equipment EM. Regarding the first bonnet 3, to suppress hydrogen leakage to the outside... Therefore, it is preferable to provide a sealing member around the door so that the inside of the first bonnet 3 can be made airtight when closed.

[0145] In the above 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 embodiment 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 it is incorporated into the circulation path CR2 which includes the second cooling device 26.

[0146] The above embodiments are as described above, and the present invention (preferred embodiments thereof) provides a work vehicle 1 as described in the following items (items 1-1 to 1-7, items 2-1 to 2-6).

[0147] (Item 1-1) A work vehicle 1 comprises 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.

[0148] 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 appropriately.

[0149] (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 longitudinal 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 longitudinal direction of the vehicle body 5.

[0150] 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 devices are positioned in a more appropriate location, taking into account the arrangement of the hydrogen tank and fuel cell.

[0151] (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 longitudinal 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.

[0152] 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.

[0153] (Items 1-4) The fuel cell 22 is positioned 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 configured to absorb the water A work vehicle 1, as described in any one of items 1-1 to 1-3, which is positioned between the raw tank 21 and the fuel cell 22.

[0154] 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, thereby enabling effective use of the space between the hydrogen tank 21 and the fuel cell 22.

[0155] (Items 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.

[0156] 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.

[0157] (Items 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.

[0158] 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.

[0159] (Items 1-7) The fuel cell 22 is located behind the hydrogen tank 21 in the front-rear direction of the vehicle body 5, in the work vehicle 1 according to any one of items 1-1 to 1-6.

[0160] 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.

[0161] (Item 2-1) A 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, a pair of rear running gears 6R, 6R provided on both sides of the rear of the vehicle body 5 in the longitudinal 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 gears 6R, 6R.

[0162] According to the work vehicle 1 of item 2-1, the first cooling unit 25 is positioned between the pair of rear running gears 6R, 6R, so the first cooling unit 25 is positioned in an appropriate location without protruding from the width of the vehicle and without interfering with the pair of rear running gears 6R, 6R.

[0163] (Item 2-2) The equipment EM (EM1, EM2, EM3) receives the electricity generated by the fuel cell 22, and The work vehicle 1 described in item 2-1 comprises a second cooling device 26 for cooling the equipment EM (EM1, EM2, EM3), wherein the second cooling device 26 is positioned between the pair of rear running devices 6R, 6R.

[0164] 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 appropriately without protruding from the width of the vehicle or interfering with the pair of rear running gears 6R, 6R.

[0165] (Item 2-3) The work vehicle 1 described in item 2-2 is configured such that 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.

[0166] According to the work vehicle 1 of item 2-3, both the first cooling unit 25 and the second cooling unit 26 are located behind the hydrogen tank 21 in the longitudinal direction of the vehicle body 5. Therefore, the first cooling unit 25 and the second cooling unit 26 are positioned appropriately, taking into account the arrangement of the hydrogen tank 21 and the fuel cell 22.

[0167] (Item 2-4) Both the first cooling device 25 and the second cooling device 26 are positioned below the fuel cell 22 in the work vehicle 1 according to item 2-2 or item 2-3.

[0168] 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.

[0169] (Item 2-5) The fuel cell 22 is positioned 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 positioned between the hydrogen tank 21 and the fuel cell 22, as described in item 2-2 of the work vehicle 1.

[0170] 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.

[0171] (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.

[0172] 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. [Explanation of symbols]

[0173] 1: Work vehicles (agricultural tractors) 2: Vehicle body 3: First bonnet 4: Second bonnet 5: Vehicle body 6F: Front running gear 6R: Rear running gear 7: Improved support mechanism 8: Control device 9: Support frame 21: Hydrogen tank 22:Fuel cell 24: Energy storage device 25: 1st cooling device 26:Second cooling device 44: Ventilation opening 50: Vehicle frame 51: Gear Case 60F: Front wheel (wheel, front wheel) 60R: Rear wheel (wheel, rear wheel) 511: Axle (rear axle) 522: Axle (front axle) 906:Equipment placement section EM: Equipment (equipped equipment) EM1: Electrical components (inverter) EM2: Electrical component (converter) EM3: Electrical components (junction box) M1: Motor (First motor) M2: Motor (Second Motor) SP: Downward space WE: Work Input

Claims

1. The car body and, A pair of front running gears are provided on both sides of the front of the vehicle body in the longitudinal direction, A pair of rear running gears are 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 in the vehicle body and which generates electricity using hydrogen supplied from the hydrogen tank, The system includes a first cooling device for cooling at least one of the hydrogen tank and the fuel cell, The first cooling device is a work vehicle positioned between the pair of rear running gears.

2. A device that receives the electricity generated by the aforementioned fuel cell, The device comprises a second cooling device for cooling the aforementioned equipment, The work vehicle according to claim 1, wherein the second cooling device is positioned between the pair of rear running gears.

3. The work vehicle according to claim 2, wherein both the first cooling device and the second cooling device are arranged behind the hydrogen tank in the longitudinal direction of the vehicle body.

4. The work vehicle according to claim 2, wherein both the first cooling device and the second cooling device are positioned below the fuel cell.

5. The fuel cell is positioned alongside the hydrogen tank in the longitudinal direction of the vehicle body. The work vehicle according to claim 2, wherein both the first cooling device and the second cooling device are arranged between the hydrogen tank and the fuel cell.

6. The work vehicle according to claim 2, wherein the first cooling device and the second cooling device are arranged side by side in the vertical direction.

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