Work vehicle

Abstract

The present invention addresses the problem of providing a work vehicle capable of achieving good weight balance.　A work vehicle of the present invention comprises a vehicle body frame (50) that supports a plurality of wheels (6F, 6R), hydrogen tanks (21, 21), a fuel cell (22) that generates electric power using hydrogen supplied from the hydrogen tanks (21, 21), and a support frame (9) that supports the hydrogen tanks (21, 21) and / or the fuel cell (22), wherein the support frame (9) is provided extending from the front side to the rear side in the front-rear direction of the vehicle body frame (50).

Description

Work vehicle

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

[0002] Conventionally, work vehicles such as agricultural machinery, construction machinery, and civil engineering machinery have a hydrogen tank for storing hydrogen, a fuel cell that generates electricity using hydrogen supplied from the hydrogen tank, a power storage device (battery) that stores the electricity generated by the fuel cell, and a motor that is driven by the electricity generated by the fuel cell or the electricity stored in the power storage device, and those that operate (for example, travel) by driving the motor have been provided (for example, see Patent Document 1). In addition, this type of work vehicle includes a cooling device (radiator) for cooling the hydrogen tank and the fuel cell. In addition, it includes electrical components (for example, an inverter, a converter, a junction box, etc.) for controlling the hydrogen tank, the fuel cell, the motor, the cooling device, etc.

[0003] Japanese Patent Publication "Japanese Unexamined Patent Publication No. 2024-95112"

[0004] By the way, since each of the hydrogen tank and the fuel cell is a heavy object, the arrangement of at least one of the fuel cell and the hydrogen tank affects the weight balance, and also affects the running stability and the working stability.

[0005] In addition, the arrangement of the motor may limit the arrangement of other devices. Therefore, an optimal arrangement of the motor is important. Also, as described above, the motor may limit the arrangement of other devices, which may lead to an increase in the size of the work vehicle.

[0006] Furthermore, in this type of work vehicle, the above-described configuration (hydrogen tank, fuel cell, motor, cooling device (radiator)) is arranged on the vehicle body. Therefore, that is, in the work vehicle having the above-described configuration, the hydrogen tank, the fuel cell, the motor, the cooling device (radiator), etc. are densely arranged within the limited space on the vehicle body, making it difficult to maintain each device. That is, since the occupied area of the hydrogen tank and the fuel cell is large, devices other than the hydrogen tank and the fuel cell are arranged in the limited remaining space, and those devices are densely arranged.

[0007] Furthermore, the cooling system's temperature rises as it cools (exchanges heat) the fuel cell, and if the cooling system is a ventilated type, the cooling air (air) that has risen in temperature due to heat exchange is exhausted. Therefore, if the placement of electrical components is not optimal, the performance of those components will deteriorate. In other words, electrical components may be affected by the surrounding environment (e.g., heat), so they need to be placed in an optimal location.

[0008] Therefore, the objective of the first invention is to provide a work vehicle that can achieve good weight balance.

[0009] Furthermore, the second invention of this invention aims to provide a work vehicle that can be made more compact by optimizing the arrangement of the motors.

[0010] Furthermore, the third invention of this invention aims to provide a work vehicle that can optimally arrange equipment other than hydrogen tanks and fuel cells.

[0011] Furthermore, the fourth invention of this invention aims to provide a work vehicle that can optimize the arrangement of electrical components.

[0012] A work vehicle according to one aspect of the first invention of the present invention comprises a vehicle body frame that supports a plurality of wheels, a hydrogen tank, a fuel cell that generates electricity using hydrogen supplied from the hydrogen tank, and a support frame that supports at least one of the hydrogen tank and the fuel cell, wherein the support frame is provided extending from the front to the rear in the longitudinal direction of the vehicle body frame.

[0013] A work vehicle according to one aspect of the second invention of the present invention comprises a body frame supporting a plurality of wheels, a gear case positioned in front of or behind the body frame, and a first motor that transmits power to at least one of the wheels and the gear case, wherein the first motor is positioned between the body frame and the gear case.

[0014] A work vehicle according to one aspect of the third invention of the present invention comprises a vehicle body, a hydrogen tank, a fuel cell that generates electricity using hydrogen supplied from the hydrogen tank, a main frame provided on the vehicle body and supporting at least one of the hydrogen tank and the fuel cell, and a subframe attached to the main frame and supporting equipment other than the hydrogen tank and the fuel cell at a distance from the main frame.

[0015] A work vehicle according to one aspect of the fourth invention of the present invention comprises a vehicle body, a hydrogen tank, a fuel cell that generates electricity using hydrogen supplied from the hydrogen tank, a motor that rotates using electricity generated by the fuel cell, a cooling device for cooling at least one of the hydrogen tank and the fuel cell, a main frame provided on the vehicle body and supporting at least one of the hydrogen tank and the fuel cell, a subframe attached to the main frame and supporting the cooling device at a distance from the main frame, and electrical components arranged between the main frame and the subframe for controlling at least one of the hydrogen tank, the fuel cell, the motor, and the cooling device.

[0016] According to the first invention of this present invention, a good weight balance can be achieved.

[0017] According to the second invention of this present invention, the arrangement of the motor can be optimized, and a more compact design can be achieved.

[0018] According to the third invention of this invention, equipment other than the hydrogen tank and fuel cell can be optimally arranged.

[0019] According to the fourth invention of this invention, the arrangement of electrical components can be optimized.

[0020] Figure 1 is an overall perspective view of a work vehicle according to one embodiment of the present invention. Figure 2 is a left side view of the work vehicle according to the same embodiment. Figure 3 is a front view of the work vehicle according to the same embodiment. Figure 4 is a rear view of the work vehicle according to the same embodiment. Figure 5 is a top view of the work vehicle according to the same embodiment. Figure 6 is an overall perspective view of the work vehicle according to the same embodiment with the first and second hoods removed. Figure 7 is an exploded perspective view of the work vehicle according to the same embodiment. Figure 8 is a partial perspective view of the work vehicle according to the same embodiment, showing the support frame assembled to the vehicle body frame and gear case. Figure 9 is a partially exploded perspective view of the work vehicle according to the same embodiment, showing the support frame removed from the vehicle body frame and gear case. Figure 10 is a partial perspective view of the work vehicle according to the same embodiment, showing the vehicle body frame and gear case assembled. Figure 11 is a partial top view of the work vehicle according to the same embodiment, showing the vehicle body frame and gear case assembled. Figure 12 is a schematic block diagram of the control device of the work vehicle according to the same embodiment. Figure 13 is a schematic cross-sectional view of the energy storage device of the work vehicle according to the same embodiment. Figure 14 is a schematic perspective view of the hydrogen tank and tank holder of the work vehicle according to the same embodiment. Figure 15 is an overall perspective view of the support frame of the work vehicle according to the same embodiment. Figure 16 is a schematic plan view of the support frame of the work vehicle according to the same embodiment. Figure 17 is a left side view of the support frame of the work vehicle according to the same embodiment. Figure 18 is a rear view of the inside of the second bonnet of the work vehicle according to the same embodiment. Figure 19 is a left side view of the inside of the second bonnet of the work vehicle according to the same embodiment. Figure 20 is a schematic exploded perspective view of the first cooling device of the work vehicle according to the same embodiment. Figure 21 is a schematic diagram of the circulation path including the first cooling device of the work vehicle according to the same embodiment. Figure 22 is a schematic exploded perspective view of the second cooling device of the work vehicle according to the same embodiment. Figure 23 is a schematic diagram of the circulation path including the second cooling device of the work vehicle according to the same embodiment. Figure 24 is a schematic perspective view of the first bonnet of the work vehicle according to the same embodiment. Figure 25 is a schematic perspective view of the second bonnet of the work vehicle according to the same embodiment, viewed from the left front. Figure 26 is a schematic perspective view of the second hood of the work vehicle of the same embodiment, seen from the right rear.Figure 27 is a left side view illustrating the arrangement of the first and second bonnets of the work vehicle according to this embodiment. Figure 28 is a schematic perspective view of a work vehicle according to another embodiment of the present invention. Figure 29 is a left side view of a work vehicle according to yet another embodiment of the present invention. Figure 30 is a left side view of a work vehicle according to yet yet another embodiment of the present invention. Figure 31 is a schematic top view of a work vehicle according to yet yet another embodiment of the present invention. Figure 32 is a schematic diagram of the circulation path including the first cooling device of a work vehicle according to yet yet another embodiment of the present invention. Figure 33 is a schematic perspective view of a work vehicle according to yet yet another embodiment of the present invention.

[0021] Hereinafter, a work vehicle according to one embodiment of the present invention will be described 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.

[0022] As shown in Figures 1 to 7, the work vehicle 1 comprises a vehicle body 2 to which a work device WE (hereinafter referred to as a work device WE: see Figure 2) for performing predetermined work can be attached, and a first bonnet 3 and a second bonnet 4 positioned on the vehicle body 2.

[0023] The vehicle body 2 includes a vehicle body 5 and is capable of driving by at least one of automatic driving and / or remote control, and is capable of being fitted with a work device WE. More specifically, the vehicle body 2 includes a vehicle body 5, front wheels 6F, 6F, and rear wheels 6R, 6R positioned behind the front wheels 6F, 6F. In this embodiment, the vehicle body 2 includes a pair of front wheels 6F, 6F spaced apart in the lateral direction perpendicular to the longitudinal direction, and a pair of rear wheels 6R, 6R spaced apart in the lateral direction and positioned behind the pair of front wheels 6F, 6F in the longitudinal direction.

[0024] In this embodiment, the front wheels 6F, 6F and the rear wheels 6R, 6R are wheels that come into contact with the ground and roll when the vehicle body 5 is in motion. More specifically, each of the front wheels 6F, 6F and the rear wheels 6R, 6R in this embodiment is a tire wheel, which includes a wheel and a tire mounted on the wheel.

[0025] In other words, the vehicle body 2 includes a vehicle body 5, a pair of front wheels 6F, 6F (tire wheels 6F, 6F) as a pair of front wheels 6F, 6F, and a pair of rear wheels 6R, 6R (tire wheels 6R, 6R) as a pair of rear wheels 6R, 6R. The vehicle body 2 also includes an impulse support mechanism 7 capable of connecting and supporting the work impulse WE, as shown in Figure 2. The first bonnet 3 and the second bonnet 4 are positioned on the vehicle body 5.

[0026] To explain in more detail, the work vehicle 1 of this embodiment includes a body 5, as shown in Figure 8. The work vehicle 1 includes wheels 6F and 6R supported by the body 5. The work vehicle 1 includes an electric motor (hereinafter referred to as the first motor M1). Accordingly, the work vehicle 1 includes electrical components EM, as shown in Figure 7. More specifically, the work vehicle 1 includes electrical components EM that control hydrogen tanks 21, 21, a fuel cell 22, motors (the first motor M1 and the second motor M2 described later), and cooling devices 25, 26.

[0027] In this embodiment, the work vehicle 1 is an agricultural machine. More specifically, the work vehicle 1 is an agricultural tractor. The work vehicle 1 is an unmanned tractor that operates automatically according to a preset program, or that 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, as shown in Figures 6 and 7, the work vehicle 1 is equipped with a control device 8 for driving and operating the work implement WE.

[0028] Furthermore, as shown in Figure 2, the work vehicle 1 includes an impulse support mechanism 7 capable of supporting a work impulse WE according to its purpose, and the impulse support mechanism 7 includes device connection parts 700, 710 to which the work impulse WE can be connected (attached and detached). Also, as shown in Figure 4, the work vehicle 1 includes a PTO shaft 20 for transmitting power to the work impulse WE supported by the impulse support mechanism 7. In other words, the work vehicle 1 includes device connection parts 700, 710 to which a work impulse WE (work device WE) that performs a predetermined task can be connected, a PTO shaft 20 that transmits power to the work impulse WE connected to the device connection parts 700, 710, and a motor (hereinafter referred to as the second motor M2: see Figures 8 and 9) that receives power from the fuel cell 22 and rotates the PTO shaft 20. The work vehicle 1 is equipped with an external output extraction mechanism (so-called PTO) including a PTO shaft 20, which is an output shaft connectable to the input shaft of the work impulse WE supported by the impulse support mechanism 7. Furthermore, since the work vehicle 1 of this embodiment is an unmanned tractor capable of automatic or remote operation, it is equipped with sensing devices SE1 and SE2 as shown in Figures 1 to 7.

[0029] As shown in Figures 6 and 7, the work vehicle 1 of this embodiment includes hydrogen tanks 21, 21 and a fuel cell 22. The work vehicle 1 also includes an energy storage device 24... The work vehicle 1 is equipped with a cooling device 25 (hereinafter referred to as the first cooling device 25) as one of the devices mounted on the work vehicle 1. The work vehicle 1 is equipped with a support frame 9 provided on the vehicle body 5. That is, the work vehicle 1 is equipped with a support frame 9 that supports the hydrogen tanks 21, 21 and the fuel cell 22.

[0030] More specifically, as shown in Figure 8, the work vehicle 1 comprises a body 5, wheels 6F and 6R supported by the body 5, and a first motor M1 that drives the wheels 6F and 6R. Furthermore, as shown in Figure 7, the work vehicle 1 comprises hydrogen tanks 21, 21 for storing hydrogen, a fuel cell 22 that generates electricity using hydrogen supplied from the hydrogen tanks 21, 21, and an energy storage device 24… for storing the electricity generated by the fuel cell 22. Accordingly, the work vehicle 1 comprises a support frame 9 on the body 5 that supports the hydrogen tanks 21, 21 and the fuel cell 22. In addition, the work vehicle 1 comprises a first bonnet 3 that houses the hydrogen tanks 21, 21 and a second bonnet 4 that houses the fuel cell 22.

[0031] In other words, the work vehicle 1 comprises a vehicle body 5, hydrogen tanks 21, 21 provided on the vehicle body 5, a fuel cell 22 provided on the vehicle body 5 and which generates electricity using hydrogen supplied from the hydrogen tanks 21, 21, and a first cooling device 25 that cools at least one of the hydrogen tanks 21, 21 and the fuel cell 22. The work vehicle 1 in this embodiment comprises a plurality of first cooling devices 25. In addition, in this embodiment, the work vehicle 1 comprises an electrical component EM and a cooling device 26 (hereinafter referred to as the second cooling device 26) separate from the first cooling device 25, which cools the electrical component EM. In other words, the work vehicle 1 comprises a first cooling device 25 that cools at least one of the hydrogen tanks 21, 21 and the fuel cell 22, and a second cooling device 26 that cools the electrical component EM.

[0032] The work vehicle 1 of this embodiment is equipped with a plurality of wheels 6F, 6R. The work vehicle 1 of this embodiment includes front wheels 6F, 6F and rear wheels 6R, 6R that are spaced apart in the front-rear direction. More specifically, the work vehicle 1 is equipped with at least a pair of wheels 6F, 6R that are positioned on both sides perpendicular to the front-rear direction of the vehicle body 5 and supported by the vehicle body 5. That is, the work vehicle 1 is equipped with at least a pair of wheels 6F, 6R, which include a pair of front wheels 6F, 6F supported at the front of the vehicle body 5 and a pair of rear wheels 6R, 6R positioned behind the pair of front wheels 6F, 6F.

[0033] As shown in Figures 9 to 11, 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.

[0034] Accordingly, the vehicle frame 50 supports multiple wheels 6F, 6R. More specifically, the vehicle frame 50 supports at least the front wheels 6F, 6F. In this embodiment, the vehicle frame 50 supports the front wheels 6F, 6F (a pair of front wheels 6F, 6F), and the gear case 51 supports the rear wheels 6R, 6R (a pair of rear wheels 6R, 6R).

[0035] To explain in more detail, the vehicle frame 50 and the gear case 51 are positioned with a gap between them in the front-rear direction. That is, the vehicle body 5 has space between the vehicle frame 50 and the gear case 51 for positioning the first motor M1. In the vehicle body 5 of this embodiment, in addition to the first motor M1, a second motor M2 is also positioned in the space between the vehicle frame 50 and the gear case 51.

[0036] More specifically, the vehicle frame 50 and the gear case 51 each have plate portions 500 and 510 that are spaced apart in the front-rear direction and face each other. The vehicle body 5 (work vehicle 1) also includes a connecting member 55 that connects the plate portion 500 of the vehicle frame 50 and the plate portion 510 of the gear case 51. In this embodiment, the connecting member 55 is a plate-shaped member that connects at least the lower end of the plate portion 500 of the vehicle frame 50 (hereinafter referred to as the first plate portion 500) and the lower end of the plate portion 510 of the gear case 51 (hereinafter referred to as the second plate portion 510), thereby maintaining a constant positional relationship between the vehicle frame 50 and the gear case 51.

[0037] 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, stands upright in the vertical direction, and extends in the front-rear direction. That is, each of the pair of side walls 501, 501 is made of a rectangular plate material, and its longitudinal direction is aligned with the front-rear direction of the vehicle body 5. The pair of side walls 501, 501 face each other laterally, spaced apart.

[0038] 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 of the vehicle frame 50 (vehicle body 5) extend laterally. In this embodiment, there is a first side wall connecting portion 502 that connects the lower ends of the pair of side walls 501, 501, and a second side wall connecting portion 503 that connects the front ends (front ends in the front-rear direction) of the pair of side walls 501, 501. The first plate portion 500 is arranged to straddle the rear ends (rear ends in the front-rear direction) of the pair of side walls 501, 501. In this embodiment, the first plate portion 500 connects the rear ends of the pair of side walls 501, 501 and also functions as a side wall connecting portion.

[0039] As will be described in detail later, each of the pair of side walls 501, 501 is connected to a locking piece 504, 504 for locking the energy storage devices 24.... The locking pieces 504, 504 extend laterally outward from the upper end of the connected side wall 501. That is, 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. The pair of locking pieces 504, 504 are provided in the area where the energy storage devices 24... are arranged. In this embodiment, a plurality of energy storage devices 24... are arranged in a line in the front-rear direction. Accordingly, the pair of locking pieces 504, 504 extend in the front-rear direction along the side wall 501 to allow for the arrangement of a plurality of energy storage devices 24.... The vehicle frame 50 supports a plurality of wheels 6F, 6R (front wheels 6F, 6F). Specifically, a steering device 52 for steering a pair of front wheels 6F, 6F is attached to the vehicle frame 50.

[0040] The second side wall connecting portion 503 includes a main body portion 503a that connects a pair of side walls 501, 501. In this embodiment, the second side wall connecting portion 503 is a support base 503b on which equipment can be installed, and further includes a support base 503b extending in the front-rear direction from the main body portion 503a. Here, the support base 503b is formed in a plate shape. In this embodiment, the second cooling device 26 is placed (fixed) on the support base 503b. That is, the support base 503b is arranged with its plate thickness direction in the vertical direction, and the second cooling device 26 is placed on the upper surface of the support base 503b (see Figure 6).

[0041] In this embodiment, in addition to the second cooling device 26, a sensing device SE1 (first sensing device SE1), which will be described later, is installed on the support base 503b (see Figure 6).

[0042] The first sensing device SE1 is positioned further forward in the longitudinal direction than the second cooling device 26, such that the first front wall 30 of the first bonnet 3 (described later) can be interposed between the first sensing device SE1 and the second cooling device 26. In other words, while the second cooling device 26 is located inside the first bonnet 3, the first sensing device SE1 is located at the very front (forward position) of the vehicle frame 50 in the longitudinal direction and is located outside the first bonnet 3.

[0043] The steering device 52 is fixed to the vehicle frame 50. Specifically, the steering device 52 includes a pair of steering knuckles 520, 520 that support the front wheels 6F, 6F 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.

[0044] In the present embodiment, the steering mechanism is a hydraulic mechanism. In the present embodiment, a drive shaft DS (see FIG. 11) described later 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 to rotationally drive each of the pair of front wheels 6F, 6F. That is, the steering device 52 includes a power distribution mechanism (hereinafter referred to as a front-wheel distribution mechanism) not shown that converts rotation around an axis extending in the front-rear direction into rotation around an axis extending in the lateral direction and transmits it to both sides in the lateral direction.

[0045] The front-wheel distribution mechanism is a gear mechanism constituted by a plurality of gears. The front-wheel distribution mechanism has a pair of axles (hereinafter referred to as front axles 522, 522) arranged at intervals in the lateral direction, and the pair of front axles 522, 522 that receive the drive of the drive shaft DS and rotate around an axis extending in the lateral direction. Accordingly, each of the pair of front wheels 6F, 6F is connected to the front-wheel distribution mechanism (the pair of front axles 522, 522). The front-wheel distribution mechanism is installed inside the steering case 521, similarly to the steering mechanism. Thereby, in the work vehicle 1 of the present embodiment, the pair of front wheels 6F, 6F are steerable and drivable.

[0046] The steering case 521 is connected to the vehicle body frame 50, and the pair of front axles 522, 522 and the pair of steering knuckles 520, 520 are arranged on both sides of the vehicle body 5 (vehicle body frame 50) in the lateral direction. Accordingly, the pair of front wheels 6F, 6F are also arranged on both sides of the vehicle body 5 (vehicle body frame 50) in the lateral direction. That is, the work vehicle 1 (vehicle body 5) includes a pair of front axles 522, 522 arranged on both sides in the lateral direction (left and right) of the vehicle body 5, and each of the front axles 522, 522 to which the wheels 6F, 6R (front wheels 6F, 6F) are connected rotates around an axis extending in the lateral direction.

[0047] The first motor M1 transmits power to at least one of the wheels 6F, 6R and the gear case 51. In the present embodiment, the first motor M1 transmits power to the gear case 51.

[0048] More specifically, a gear mechanism composed of a plurality of gears is installed inside the gear case 51. 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, and rotationally drives each of the pair of rear wheels 6R, 6R. That is, the gear mechanism inside the gear case 51 functions as a power distribution mechanism (hereinafter referred to as a rear-wheel distribution mechanism) that converts the rotation around the axis extending in the front-rear direction into the rotation around the axis extending in the lateral direction and transmits it to both sides in the lateral direction.

[0049] Specifically, the rear-wheel distribution mechanism is a pair of axles (hereinafter referred to as rear axles 511, 511) that are output shafts arranged at intervals in the lateral direction, and has a pair of rear axles 511, 511 that receive the drive of the first motor M1 and rotate around the axis extending in the lateral direction. Accordingly, each of the pair of rear wheels 6R, 6R is connected to the rear-wheel distribution mechanism (the pair of rear axles 511, 511).

[0050] The pair of rear axles 511, 511 are arranged on both sides in the lateral direction of the gear case 51. Accordingly, the pair of rear wheels 6R, 6R are also arranged on both sides in the lateral direction of the vehicle body 5 (gear case 51). That is, the work vehicle 1 (vehicle body 5) is provided with a pair of rear axles 511, 511 that are arranged on both sides in the lateral direction (left and right) of the vehicle body 5 on the rear side in the front-rear direction with respect to the pair of front axles 522, 522, and each of the wheels 6F, 6R (rear wheels 6R, 6R) is connected thereto, and the pair of rear axles 5 (11), 511 rotate around the axis extending in the lateral direction respectively.

[0051] In this embodiment, the rear wheel distribution mechanism has an output shaft that extends forward in the longitudinal direction, separate from the pair of rear axles 511, 511. A drive shaft DS (see Figure 11) that extends in the longitudinal direction is connected to the output shaft and 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 6R, 6R, and also transmits the rotational force of the first motor M1 to the front wheels 6F, 6F (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 6F, 6F and the pair of rear wheels 6R, 6R can be driven. In other words, the work vehicle 1 of this embodiment is four-wheel drive.

[0052] The first motor M1 is fixed to the second plate portion 510 (plate portions 500, 510) of the gear case 51. Specifically, in this embodiment, the first motor M1 is positioned with its output shaft (axis) in the front-rear direction. Accordingly, the first motor M1 is fixed to the second plate portion 510 with its output shaft passing through it. That is, the first motor M1 is positioned with its output shaft extending from the motor body to the rear in the front-rear direction, and is fixed to the second plate portion 510 with the output shaft inserted through a through hole provided in the second plate portion 510. The output shaft of the first motor M1 that passes through (is inserted into) the second plate portion 510 is connected to the gear mechanism inside the gear case 51. As a result, the first motor M1 is positioned between the plate portion 500 of the vehicle body frame 50 and the plate portion 510 of the gear case 51.

[0053] The work vehicle 1 of this embodiment includes an inverter, a converter, a junction box including a switching relay, and a power storage device 24… (secondary battery) as electrical components EM. More specifically, the work vehicle 1 includes at least one of the following: a power storage device 24… (secondary battery), an inverter, a radiator, a motor, and a converter, housed in at least one of the first bonnet 3 and the second bonnet 4. In this embodiment, the work vehicle 1 includes an inverter housed in the second bonnet 4, a first cooling device 25 (radiator), and a converter as electrical components EM.

[0054] 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).

[0055] As shown in Figure 12, the control device 8 comprises an arithmetic control unit 80, a storage unit 81 that stores information used in the processing of the arithmetic control unit 80, an input unit 82 that receives input signals (electrical signals) from at least a receiving device (transceiver: not shown) that receives signals from the outside, switches, sensing devices SE1, SE2 (described later), etc., and an output unit 83 that outputs control signals to the electric equipment to be controlled (first motor M1, second motor M2, actuator, etc.). Based on the input signals received from the input unit 82 and the information stored in the storage unit 81, the control device 8 generates control signals to control each part of the work vehicle 1 and outputs them to each part to be controlled.

[0056] 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).

[0057] As shown in Figures 2 and 10, the impulse support mechanism 7 is a so-called three-point linkage mechanism. Specifically, the impulse support mechanism 7 comprises a pair of lower links 70, 70, each rotatably connected around an axis extending laterally with respect to the vehicle body 5, and a pair of lower links 70, 70 spaced apart laterally; an upper link 71, rotatably connected around an axis extending laterally with respect to the vehicle body 5, and positioned above the pair of lower links 70, 70, corresponding to the central position between the pair of lower links 70, 70; and a pair of hydraulic actuators 72, 72, each positioned to correspond to the pair of lower links 70, 70, and each hydraulic actuator 72, 72 (see Figure 10) that swings (rotates) the corresponding lower links 70, 70.

[0058] In this embodiment, the pair of lower links 70, 70 and upper link 71 are connected to the rear end of the vehicle body 5. That is, the pair of lower links 70, 70 and upper link 71 are connected to the rear end face of the gear case 51 in the front-rear direction. The pair of lower links 70, 70 and upper link 71 extend in a direction intersecting the axis that serves as the center of rotation. In this embodiment, the pair of lower links 70, 70 and upper link 71 extend rearward from the rear end of the vehicle body 5. The respective ends of the pair of lower links 70, 70 and upper link 71 are formed in a hook shape and are configured to be able to connect the connecting portion of the work implement WE in a locked state. That is, the respective ends of the pair of lower links 70, 70 and upper link 71 are device connecting portions 700, 710 to which the work implement WE (work implement WE) can be attached. Figure 2 shows the state in which the rotary WE, which is the working impulse WE, is supported by the impulse support mechanism 7.

[0059] The PTO shaft 20 is connected via a universal joint to the input shaft equipped on the working impulse WE, which is supported by the impulse support mechanism 7 (lower links 70, 70 and upper link 71). In this embodiment, since the impulse support mechanism 7 is connected to the rear end of the vehicle body 5 (the rear end of the gear case 51), the PTO shaft 20 is also provided on the rear end side of the vehicle body 5, as shown in Figure 4.

[0060] More specifically, the PTO (External Output Take-Off) in this embodiment includes a PTO shaft 20, an input shaft (not shown) for external output take-off to which the output of the second motor M2 is input, and a rotation transmission mechanism (not shown) that transmits the rotation of the input shaft for external output take-off to the PTO shaft 20. The input shaft for external output take-off and the PTO shaft 20 are arranged so that their axes are parallel or substantially parallel to each other, and the rotation transmission mechanism is interposed between the input shaft for external output take-off and the PTO shaft 20. In this embodiment, the PTO (External Output Take-Off) is housed in a gear case 51. That is, the PTO (External Output Take-Off) is housed in the gear case 51 together with the rear wheel distribution mechanism. Accordingly, the second motor M2 is fixed to the second plate portion 510 (plate portions 500, 510) of the gear case 51, similar to the first motor M1.

[0061] In this embodiment, the second motor M2 is positioned with its output shaft (axis) in the front-rear direction. Accordingly, the second motor M2 is fixed to the second plate portion 510 with its output shaft passing through the second plate portion 510. That is, the output shaft of the second motor M2, which extends from the motor body, is positioned to extend towards the rear in the front-rear direction, and the output shaft is inserted through a through hole provided in the second plate portion 510, and the motor is fixed to the second plate portion 510. The output shaft of the second motor M2, which passes through (is inserted into) the second plate portion 510, is connected to an input shaft for external output extraction within the gear case 51. The PTO shaft 20 passes through the gear case 51 and extends from the gear case 51 toward the rear. As a result, the second motor M2 is positioned between the plate portion 500 of the vehicle frame 50 and the plate portion 510 of the gear case 51, similar to the first motor M1. In this embodiment, the first motor M1 and the second motor M2 are arranged side by side in the lateral direction.

[0062] As described above, in the work vehicle 1 of this embodiment, the steering mechanism of the steering device 52 is a hydraulic mechanism, and the impulse support mechanism 7 is also equipped with hydraulic actuators 72, 72 (hydraulic cylinders), so a hydraulic system is provided to supply hydraulic fluid to them. The hydraulic system includes a hydraulic pump for sending hydraulic fluid toward the target (steering mechanism and hydraulic actuators). The input shaft of the hydraulic pump is driven via the input shaft for external output of the PTO (external output take-off mechanism).

[0063] 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 13. 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 centerlines of the hydrogen tanks 21, 21 (the longitudinal direction in which the centerline of the body portion 210, described later, extends), as shown in Figure 7, and are arranged either vertically or horizontally along the vehicle body 5. In this embodiment, the hydrogen tanks 21, 21 are positioned with the centerline of the body portion 210, described later, in the front-rear direction and are located above the vehicle body frame 50 (vehicle body 5). Accordingly, the plurality of energy storage devices 24... (battery packs) are arranged below the hydrogen tanks 21, 21 in the front-rear direction.

[0064] 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 tanks 21, 21 and along the longitudinal direction of the hydrogen tanks 21, 21.

[0065] 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 13, when viewed from the front or rear direction (front view), it exhibits a T-shape. Specifically, the energy storage device 24... is composed of three parts. That is, the energy storage device 24... has a first part 241, a second part 242, and a third part 243. The first part 241, the second part 242, and the third part 243 are formed by a casing 240 (battery case 240). In other words, the energy storage device 24... includes a casing 240 that constitutes the outer shell, and the casing 240 defines the first part 241, the second part 242, and the third part 243.

[0066] Each of the first part 241, the second part 242, and the third part 243 is formed in a box shape and, when viewed from the front or back, has a rectangular shape.

[0067] The outer dimensions of the first portion 241 in the lateral direction are set to be smaller than the distance (internal dimension) between the pair of side walls 501, 501. That is, the outer dimensions of the first portion 241 are set to be such that it can be inserted between the pair of side walls 501, 501. The lengths of the first portion 241, the second portion 242, and the third portion 243 in the front-rear direction are set to be the same, and both front-rear surfaces of the first portion 241, the second portion 242, and the third portion 243 are positioned on the same plane.

[0068] 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.

[0069] 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 half of the lower vertical portion of the first portion 241 protrudes downward from the lower surfaces of the second portion 242 and the third portion 243 on both sides in the horizontal direction.

[0070] 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.

[0071] In this embodiment, the first portion 241 houses a plurality of battery modules BM... The plurality of battery modules BM... are stacked vertically within the first portion 241.

[0072] In this embodiment, the first portion 241 houses two battery module groups G arranged horizontally, each group consisting of multiple battery modules BM stacked vertically within the first portion 241.

[0073] The second section 242 houses electrical components 244, such as a monitoring unit for monitoring the battery module BM. The third section 243 forms an air passage for cooling air that cools the battery module BM, and a heat sink 245 is housed within this air passage. The air passage formed in the third section 243 extends in the front-rear direction, with one end open to the outside and the other end connected to an opening provided on either the front or rear surface of the first section 241. An exhaust pipe (not shown) is connected to the outside through the other opening provided on either the front or rear surface of the first section 241.

[0074] 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 in the front-to-back direction within the first section 241, 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.

[0075] 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.

[0076] 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.

[0077] Multiple energy storage devices 24... are electrically connected in series, and the terminals at the uppermost and lowermost ends of the current flow (positive terminal and negative terminal) are electrically connected to the fuel cell 22 and the motors (first motor M1 and second motor M2). 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 and second motor M2.

[0078] Specifically, the work vehicle 1 is equipped with a junction box containing multiple relay devices controlled by a control device 8, each of which is connected to the fuel cell 22 and the motors (first motor M1 and second motor M2). The energy storage devices 24... are connected to the relay devices in the junction box via power lines. As a result, the control device 8 switches the energy storage devices 24... between a state where they are connected to the fuel cell 22 and storing energy and a state where they stop storing energy, or between a state where they supply power to the motors (first motor M1 or second motor M2) and a state where they stop supplying power (motor operation and stop).

[0079] In this embodiment, when the fuel cell 22 is generating power, power can also be supplied from the fuel cell 22 to the first motor M1 and the second motor M2. That is, the first motor M1 rotates by receiving power from the fuel cell 22. Similarly, the second motor M2 rotates by receiving power from the fuel cell 22.

[0080] As shown in Figures 6 and 7, the hydrogen tanks 21, 21 are supported by the vehicle body 5 (vehicle frame 50). That is, the hydrogen tanks 21, 21 are installed on the vehicle body 5. A gap is formed between the hydrogen tanks 21, 21 and the plurality of energy storage devices 24... that allows for ventilation in the front-rear direction. In other words, the work vehicle 1 is equipped with a support frame 9 that supports the hydrogen tanks 21, 21 between the hydrogen tanks 21, 21 and the plurality of energy storage devices 24.... This support frame 9 interposed between the vehicle body 5 (vehicle frame 50) and the hydrogen tanks 21, 21 forms a gap (air passage) that extends in the front-rear direction. As shown in Figure 14, the hydrogen tanks 21, 21 include a cylindrical body portion 210 and a pair of mirror portions 211, 211 that close both ends of the body portion 210.

[0081] The work vehicle 1 of this embodiment is equipped with a plurality of hydrogen tanks 21, 21. Specifically, the work vehicle 1 of this embodiment is equipped with two hydrogen tanks 21, 21. Each of the two hydrogen tanks 21, 21 has an elongation in the direction in which the axis (centerline) of the body 210 extends. That is, the axial length of the hydrogen tanks 21, 21 is longer than the diameter of the body 210. In this embodiment, each of the two hydrogen tanks 21, 21 is arranged side by side so that their centerlines are parallel or substantially parallel to each other.

[0082] In this embodiment, each of the two hydrogen tanks 21, 21 is positioned such that the centerline of the body portion 210 extends in the front-rear direction. One of the end caps 211 of the hydrogen tanks 21, 21 is connected to piping that leads to the fuel cell 22. Specifically, an on / off valve is attached to one of the end caps 211. Piping that leads to the fuel cell 22 is connected to the on / off valve. As a result, by opening and closing the on / off valve, it is possible to switch the supply of hydrogen from the hydrogen tanks 21, 21 to the fuel cell 22 on and off.

[0083] The work vehicle 1 is equipped with a tank holder 23 for holding the hydrogen tanks 21, 21. Specifically, since the work vehicle 1 of this embodiment has multiple (two) hydrogen tanks 21, 21, it is equipped with a tank holder 23 for integrally holding these multiple hydrogen tanks 21, 21.

[0084] The hydrogen tanks 21, 21 are detachable from the vehicle frame 50 and are movable in at least two directions, vertically and longitudinally, when attached or detached. In this embodiment, since the hydrogen tanks 21, 21 are held by the tank holder 23, the tank holder 23 is directly or indirectly supported by the vehicle frame 50 and is detachable from the vehicle frame 50 together with the hydrogen tanks 21, 21, and is movable in at least two directions, vertically and longitudinally, when attached or detached together with the hydrogen tanks 21, 21.

[0085] In this embodiment, the tank holder 23 is screwed to the support frame 9, and can be removed from the support frame 9 (vehicle frame 50) by releasing these screws. Furthermore, because the tank holder 23 is positioned on the upper surface of the support frame 9, the hydrogen tanks 21, 21 (tank holder 23) can move forward in the front-rear direction, to both the left and right in the lateral direction, and upward. In other words, free space is secured in front of the hydrogen tanks 21, 21 (tank holder 23), on both the left and right sides in the lateral direction, and above the hydrogen tanks 21, 21 (tank holder 23) without any structures that would hinder the movement of the hydrogen tanks 21, 21 (tank holder 23).

[0086] More specifically, the tank holder 23 includes a lower frame 230 formed in the shape of a rectangular frame in plan view, an upper frame 231 positioned above the lower frame 230, which is also formed in the shape of a rectangular frame in plan view and overlaps with the lower frame 230 when viewed from above, and a plurality of support columns 232... connecting the lower frame 230 and the upper frame 231.

[0087] Each of the lower frame 230 and the upper frame 231 includes a pair of vertical beams 230a, 230a, 231a, 231a arranged at intervals in the lateral direction, each of which extends in the front-rear direction, and a pair of horizontal beams 230b, 230b, 231b, 231b arranged at intervals in the front-rear direction, each of which extends in the lateral direction and connects the ends of the pair of vertical beams 230a, 230a, 231a, 231b. Multiple support columns 232... connect the lower frame 230 and the upper frame 231, and maintain the distance between the lower frame 230 and the upper frame 231 at a distance that allows for the placement of hydrogen tanks 21, 21. In this embodiment, the multiple support columns 232... connect and support the four corners of the lower frame 230 and the four corners of the upper frame 231.

[0088] The multiple (two) hydrogen tanks 21, 21, arranged side by side, are positioned between the upper frame 231 and the lower frame 230. When viewed from above, they are located between a pair of vertical beams 230a, 230a, 231a, 231a, and also between a pair of horizontal beams 230b, 230b, 231b, 231b. In other words, the multiple hydrogen tanks 21, 21 are positioned within the frame of the upper frame 231 (lower frame 230) when viewed from above. In this embodiment, the multiple connecting beams 233... that connect the pair of vertical beams 230a, 230a, 231a, 231a are arranged in the lower frame 230 with spacing in the front-to-back direction. As a result, the multiple hydrogen tanks 21, 21, positioned within the frame of the upper frame 231 (lower frame 230) when viewed from above, are positioned on the multiple connecting beams 233... Furthermore, in order to prevent the hydrogen tanks 21 from rolling, the multiple hydrogen tanks 21 may be fixed to the connecting beam 233 collectively or individually using fasteners such as fixing belts.

[0089] As shown in Figure 8, 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, 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, 21 are held by the tank holder 23, and are therefore positioned on the support frame 9 via the tank holder 23. In this way, the support frame 9 supports the hydrogen tanks 21, 21 and the fuel cell 22.

[0090] As shown in Figures 8 and 9, the support frame 9 is positioned at least between the front wheels 6F, 6F and the rear wheels 6R, 6R. The support frame 9 is provided extending from the front to the rear in the longitudinal direction of the vehicle body frame 50 (vehicle body 5).

[0091] In this embodiment, the front end of the support frame 9 in the front-rear direction is connected to the vehicle body frame 50, and the rear end of the support frame 9 in the front-rear direction is connected to the gear case 51.

[0092] More specifically, as shown in Figures 15 to 17, the support frame 9 includes a main frame 90 provided on the vehicle body 5 and supporting at least one of the hydrogen tanks 21, 21 and the fuel cell 22, and subframes 91, 91, 92 attached to the main frame 90 and supporting equipment other than the hydrogen tanks 21, 21 and the fuel cell 22, spaced apart from the main frame 90.

[0093] The overall length of the main frame 90 in the longitudinal direction is set to be the same as or approximately the same as the overall length of the vehicle body 5 in the longitudinal direction. The main frame 90 includes a first support section 90A that supports the hydrogen tanks 21, 21, and a second support section 90B that is aligned in the longitudinal direction with respect to the first support section 90A and supports the fuel cell 22. The upper end of the second support section 90B is configured to support the fuel cell 22 above the support position of the hydrogen tanks 21, 21 by the first support section 90A.

[0094] The main frame 90 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.

[0095] The pair of first beam sections 900, 900 are arranged to overlap vertically with the pair of vertical beams 230a, 230a, 231a, 231a of the tank holder 23. That is, the spacing between the pair of first beam sections 900, 900 in the horizontal direction is set to be the same as or approximately the same as the spacing between the pair of vertical beams 230a, 230a, 231a, 231a in the same direction.

[0096] Brackets 902, 903, and 904 for fixing the support frame 9 (main frame 90) to the vehicle body 5 are attached to the lower surface of the main frame 90 (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 includes a plurality of brackets 902, 903, and 904 that are attached to the main frame 90 and are spaced apart in the front-rear direction.

[0097] In this embodiment, the support frame 9 includes a first bracket 902 attached to the front end of the main frame 90, which overlaps with the front end of the vehicle body frame 50, and a second bracket 903 attached to the rear end of the main frame 90, which overlaps with the gear case 51. The support frame 9 in this embodiment also includes a third bracket 904 attached to the main frame 90, which is positioned between the first bracket 902 and the second bracket 903 in the front-rear direction and overlaps with the connecting member 55 located between the vehicle body frame 50 and the gear case 51.

[0098] The first bracket 902 overlaps the vehicle frame 50 in the vertical direction, and the second bracket 903 overlaps the gear case 51 (in this embodiment, the support base 530 fixed to the gear case 51). The third bracket 904 is positioned in the middle of the support frame 9 in the front-rear direction and overlaps the connecting member 55 in the vertical or horizontal direction (in this embodiment, the vertical direction). In this embodiment, the first bracket 902, the second bracket 903, and the third bracket 904 are attached to each of the pair of first beams 900, 900. As a result, a pair of first brackets 902 are provided on the front side of the support frame 9 in the front-rear direction, and a pair of second brackets 903 are provided on the rear side of the support frame 9 in the front-rear direction. A pair of third brackets 904 are provided at the middle position of the support frame 9 in the front-rear direction.

[0099] A pair of first brackets 902 are screw-fixed to the vehicle frame 50 (side wall 501), and a pair of second brackets 903 are screw-fixed to the gear case 51 (support base 530). A pair of third brackets 904 are screw-fixed to the connecting member 55. The first brackets 902, second brackets 903, and third brackets 904 are set to a vertical height so that the support frame 9 (main frame 90) is in a predetermined position (horizontal or nearly horizontal position with the work vehicle 1 positioned on a horizontal plane).

[0100] In this embodiment, the hydrogen tanks 21, 21 and the fuel cell 22 are arranged side by side in the front-to-back direction (see Figures 1 to 7). In this embodiment, the hydrogen tanks 21, 21 are positioned in front of the fuel cell 22. Accordingly, the front region of the main frame 90 is designated as the first support portion 90A that supports the hydrogen tanks 21, 21, and the rear region of the main frame 90 is designated as the second support portion 90B that supports the fuel cell 22.

[0101] In this embodiment, a tank holder 23 is positioned on the first support section 90A. Specifically, in the first support section 90A of the main frame 90, the tank holder 23 is positioned such that a pair of vertical beams 230a, 230a, 231a, 231a overlap vertically with respect to a pair of first beam sections 900, 900. In this embodiment, a plurality of connecting beams 233... of the tank holder 23 are connected to the lower surfaces of the pair of vertical beams 230a, 230a, 231a, 231a. Therefore, in the first support section 90A, a plurality of connecting beams 233... are placed on respect to a pair of first beam sections 900, 900.

[0102] In this embodiment, the support position of the fuel cell 22 in the second support section 90B (referred to as the second support surface S2) is set higher than the support position of the hydrogen tanks 21, 21 (tank holders 23) in the first support section 90A (referred to as the first support surface S1). Accordingly, the second support section 90B is configured to allow electrical components EM to be placed below the fuel cell 22.

[0103] More specifically, the second support section 90B includes a plurality of legs 905... erected on the main frame 90 (first beam sections 900, 900), and an equipment installation section 906 including a first support surface S1 on which the fuel cell 22 is placed, the equipment installation section 906 being supported by the plurality of legs 905.... The plurality of legs 905... are arranged on the main frame 90 (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....

[0104] The outer casing of the equipment mounting section 906 is formed in a rectangular (approximately square) shape. The equipment mounting section 906 may be composed of a rectangular plate in plan view, but in this embodiment it is formed in a rectangular frame shape in plan view. Accordingly, the four legs 905... support the four corners of the equipment mounting section 906. As a result, the upper surface of the equipment mounting section 906 constitutes the second support surface S2, and the fuel cell 22 is placed (mounted) on the second support surface S2.

[0105] Furthermore, since the equipment mounting section 906 is supported by the leg section 905, a space is formed below the second support surface S2 (equipment mounting section 906). Accordingly, in this embodiment, electrical components EM are arranged in this space (see Figure 7). In this embodiment, the electrical components EM include junction boxes and relay equipment. As described above, the first support section 90A is positioned in front of the second support section 90B in the front-rear direction. As a result, the hydrogen tanks 21, 21 are positioned in front of the electrical components EM. The electrical components EM are also positioned between the main frame 90 and the subframes 91, 91, 92.

[0106] As shown in Figures 6, 7, and 8, the subframes 91, 91, 92 support the equipment above at least one of the pair of wheels 6F, 6R. More specifically, in this embodiment, the subframes 91, 91, 92 are attached to the rear end of the main frame 90 in the front-rear direction. Accordingly, the subframes 91, 91, 92 are supports that support the equipment above at least one of the pair of rear wheels 6R, 6R. As shown in Figures 15 to 17, the subframes 91, 91, 92 are connected to the upper end of the equipment mounting section 906 (second support section 90B) and extend vertically and intersectingly relative to the equipment mounting section 906 (second support section 90B). In this embodiment, the subframes 91, 91, 92 are attached directly or indirectly to the equipment mounting section 906.

[0107] More specifically, the support frame 9 includes a plurality (three in this embodiment) of subframes 91, 91, 92. That is, the support frame 9 includes a pair of first subframes 91, 91 located on both sides (right and left) of the main frame 90 in the lateral direction, and a second subframe 92 located on the rear side of the main frame 90 in the front-rear direction.

[0108] Each of the pair of first subframes 91, 91 is attached to a bracket 910 mounted on the upper surface of the equipment mounting section 906, and the bracket 910 extends from the equipment mounting section 906 in a direction perpendicular to the vertical direction (lateral direction). In contrast, the second subframe 92 is connected to the rear end of the equipment mounting section 906 in the front-rear direction. As a result, the three subframes 91, 91, 92 (the pair of first subframes 91, 91 and the second subframe 92) are positioned higher than the first support surface S1 and the second support surface S2, and are arranged to surround the equipment mounting section 906. Furthermore, the pair of first subframes 91, 91 are located above the pair of rear wheels 6R, 6R (see Figures 6 and 7). That is, the first subframes 91, 91 are positioned so as to overlap the rear wheels 6R, 6R when viewed from above.

[0109] As described above, the pair of first subframes 91, 91 are set to a shape and size that allows equipment to be placed in a plan view, assuming that they overlap with the rear wheels 6R, 6R when viewed from above.

[0110] As described above, the subframes 91, 91, and 92 are connected to the equipment mounting section 906 and extend in a direction perpendicular to the vertical direction. Therefore, electrical components EM located below the equipment mounting section 906 (first support surface S1) are located below the equipment supported by the subframes 91, 91, and 92.

[0111] In this embodiment, the subframes 91, 91, 92 support the first cooling device 25 as equipment other than the hydrogen tank 21 and the fuel cell 22. In this embodiment, each of the first subframes 91, 91 and the second subframe 92 supports the first cooling device 25. That is, the work vehicle 1 is equipped with a plurality of first cooling devices 25, and the plurality of first cooling devices 25 are arranged on a plurality of subframes 91, 91, 92 (a pair of first subframes 91, 91 and a second subframe 92). As a result, the plurality of first cooling devices 25 are arranged to surround the fuel cell 22 which is located on the equipment installation section 906.

[0112] With the support frame 9 configured as described above, the hydrogen tanks 21, 21 are supported by the main frame 90 (first support section 90A), and the subframes 91, 91, 92 support the first cooling device 25 such that the upper end of the cooling device 25 is located above the upper end of the hydrogen tanks 21, 21.

[0113] As described above, in the work vehicle 1 of this embodiment, the first motor M1 is positioned between the vehicle frame 50 and the gear case 51. Also, as described above, since the hydrogen tanks 21, 21 are positioned above the vehicle frame 50, the first motor M1 is positioned below the hydrogen tanks 21, 21. Furthermore, the first motor M1 is positioned below the electrical components EM. Also, since the first motor M1 and the second motor M2 are positioned side by side in the lateral direction, the second motor M2 is also positioned below the hydrogen tanks 21, 21. Furthermore, since the energy storage devices 24... are positioned with a portion of them attached to the vehicle frame 50, they are positioned below the electrical components EM.

[0114] Each of the multiple first cooling devices 25 is a ventilated cooling device. The multiple first cooling devices 25 are arranged on the vehicle body 5 such that the direction of cooling airflow differs, as shown in Figures 6, 7, 18, and 19. That is, the direction of cooling airflow for the multiple first cooling devices 25 is set according to the arrangement of the multiple subframes 91, 91, 92 (first subframes 91, 91, and second subframe 92). In this embodiment, the multiple first cooling devices 25 are arranged so that the direction of cooling air discharge is directed outward from the vehicle body 5. That is, each of the multiple first cooling devices 25 is arranged so that the hot air after heat exchange is discharged to the outside.

[0115] Of the multiple first cooling devices 25, at least one first cooling device 25 is positioned above at least one of the wheels 6F, 6R of a pair of wheels 6F, 6R. More specifically, the first cooling device 25 is positioned above at least one of the rear wheels 6R of a pair of rear wheels 6R, 6R. The upper surface of the first cooling device 25 is higher than the upper surface of the hydrogen tanks 21, 21. In this embodiment, the multiple first cooling devices 25 are arranged to surround the fuel cell 22. Specifically, a pair (two) of first cooling devices 25, each positioned on a pair of first subframes 91, 91, are positioned above the pair of rear wheels 6R, 6R, corresponding to their position on the first subframes 91, 91.

[0116] 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 20, 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.

[0117] The heat exchanger 250 includes a plurality of heat dissipation fins Fa... arranged at intervals, and a pipe Pa that penetrates the plurality of heat dissipation fins Fa... and through which a liquid (cooling medium) flows. Each of the plurality of heat dissipation fins Fa... is a thin metal plate (sheet) with high thermal conductivity, and is positioned facing the adjacent heat dissipation fins Fa.

[0118] Each of the multiple heat dissipation fins Fa... is formed in the shape of a strip (or rectangular strip), and is stacked with its longitudinal and transverse directions aligned, forming multiple air 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.

[0119] 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 for drawing in air, and the other end of the heat dissipation fins Fa in the short direction of the heat dissipation fin group constitutes an exhaust section 250b for expelling (discharging) air. That is, the heat dissipation fin group forms a surface at one end of the multiple heat dissipation fins Fa... in the short direction, and forms a surface at the other end of the multiple heat dissipation fins Fa... in the short direction. As a result, in the heat exchanger 250, one end of each of the multiple heat dissipation fins Fa... in the short direction constitutes an intake section 250a, and the other end of each of the multiple heat dissipation fins Fa... in the short direction constitutes an exhaust section 250b.

[0120] Pipe Pa is a metal pipe with high thermal conductivity. Pipe Pa is a metal tube with high thermal conductivity, and is made of, for example, aluminum or copper. Pipe Pa includes multiple straight pipe sections Pa1 that penetrate multiple heat dissipation fins Fa at multiple locations, and semi-circular bent pipe sections Pa2, each of which consists of multiple turn pipe sections Pa2 connecting two adjacent straight pipe sections Pa1, the ends of Pa1, etc., forming a curved flow path.

[0121] 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.

[0122] In this embodiment, each of the multiple first cooling devices 25 is supported by the subframes 91, 91, 92 as described above. Specifically, the multiple first cooling devices 25 are arranged so that they have different airflow directions (intake and exhaust directions) to the heat exchanger 250 and are fixed to the support frame 9 (subframes 91, 91, 92).

[0123] In this embodiment, the first cooling device 25 is a suction-type heat exchanger as described above, and the blower 251 is positioned outside the heat exchanger 250 (on the opposite side from the fuel cell 22). That is, in the first cooling device 25, the heat exchanger 250 is positioned inside the blower 251 (on the fuel cell 22 side). If the first cooling device 25 is a forced-air radiator, the heat exchanger 250 is positioned outside the blower 251 (on the opposite side from the fuel cell 22).

[0124] In this embodiment, the fuel cell 22 is water-cooled, and overheating is prevented by circulating water (coolant), which is the cooling medium. Furthermore, if a water jacket is attached to the outer circumference of the hydrogen tanks 21, 21, overheating of the hydrogen tanks 21, 21 is prevented by circulating water (coolant), which is the cooling medium, through the water jacket.

[0125] Accordingly, as shown in Figure 21, the first cooling device 25 supplies water (cooling liquid), which is the cooling medium, to the equipment to be cooled (as described above, equipment such as the fuel cell 22). That is, the first cooling device 25 is positioned on the circulation path CR1, which circulates the cooling medium, and includes a circulation pump P, a liquid tank, and the equipment to be cooled (fuel cell 22 in this embodiment) at intermediate positions. In other words, the pipe Pa of the first cooling device 25 is connected to the piping PB1 in the circulation path CR1. In this embodiment, since there are multiple first cooling devices 25, the pipes Pa of multiple first cooling devices 25 are directly or indirectly connected to the piping PB1 in the circulation path CR1. In this embodiment, the pipes Pa of multiple first cooling devices 25 are connected in series via the piping PB1, so that the cooling liquid, which is the cooling medium, passes through multiple first cooling devices 25 (heat exchangers 250) in sequence.

[0126] In the first cooling device 25 with the above configuration, the liquid, which is the heat exchange medium, is cooled by exchanging heat with the air between the heat dissipation fins Fa as it flows through the pipe Pa. Therefore, the first cooling device 25 prevents the fuel cell 22 from becoming overheated as the cooled medium (cooling liquid) is supplied to the fuel cell 22.

[0127] 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 22, 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.

[0128] 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.

[0129] 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 for drawing in air, and the other end of the heat dissipation fins Fb in the heat dissipation fin group in the short direction constitutes an exhaust section 260b for expelling (discharging) air. That is, the heat dissipation fin group forms a surface at one end of the multiple heat dissipation fins Fb... in the short direction, and forms a surface at the other end of the multiple heat dissipation fins Fb... in the short direction. As a result, in the heat exchanger 260, one end of the multiple heat dissipation fins Fb... in the short direction constitutes the intake section 260a, and the other end of the multiple heat dissipation fins Fb... in the short direction constitutes the exhaust section 260b.

[0130] 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.

[0131] 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.

[0132] In this embodiment, the second cooling device 26 is attached to the front of the vehicle body 5 (vehicle frame 50). Specifically, the second cooling device 26 is fixed to the front end (support base 503b) of the vehicle frame 50 with the intake portion 260a of the heat exchanger 260 facing rearward in the front-rear direction. In this embodiment, the second cooling device 26 is a suction-type heat exchanger, and the blower 261 is positioned in front of the heat exchanger 260 in the front-rear direction (on the exhaust portion 260b side). That is, the second cooling device 26 is a suction-type heat exchanger that forcibly supplies air to the heat exchanger 260 by blowing (inhaling) air from 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-in type radiator. If the second cooling device 26 is a forced-air radiator, the blower 261 is positioned behind the heat exchanger 250 (towards the intake section 260a).

[0133] In this embodiment, all or part of the electrical component EM is water-cooled, and by circulating water (coolant), which is the cooling medium, the electrical component EM is prevented from becoming overheated.

[0134] Accordingly, as shown in Figure 23, the second cooling device 26 supplies water (coolant), which is the cooling medium, to the equipment to be cooled (as described above, the electrical component EM). 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 component EM 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.

[0135] In the second cooling device 26 with the above configuration, the liquid, which is the heat exchange medium, is cooled by exchanging heat with the air between the heat dissipation fins Fa as it flows through the pipe Pa. Therefore, the electrical component EM is supplied with the cooled medium (coolant), and as a result, the second cooling device 26 prevents the electrical component EM from becoming overheated.

[0136] In this embodiment, the second cooling device 26 is positioned so that its ventilation direction and ventilation position correspond to the gap. That is, the second cooling device 26 is attached to either the front or rear end of the vehicle body 5. In this embodiment, the second cooling device 26 is attached to the front end of the vehicle body 5 so that its ventilation direction and ventilation position correspond to the gap formed by the support frame 9.

[0137] As shown in Figures 1 and 2, the first bonnet 3 and the second bonnet 4 are arranged in the front-to-back direction. In this embodiment, the second bonnet 4 is positioned rearward relative to the first bonnet 3. That is, in this embodiment, since the hydrogen tanks 21, 21 are positioned on the first support portion 90A of the support frame 9 and the fuel cell 22 is positioned on the second support portion 90B, the second bonnet 4 covering the fuel cell 22 is positioned behind the first bonnet covering the hydrogen tanks 21, 21.

[0138] The first bonnet 3 is positioned to correspond to at least one of the front wheels 6F, 6F and the rear wheels 6R, 6R. In this embodiment, the first bonnet 3 is positioned to correspond to the front wheels 6F, 6F. That is, the first bonnet 3 is positioned above the front wheels 6F, 6F when viewed from the side. Also, the front of the first bonnet 3 in the longitudinal direction is positioned in front of the front wheels 6F, 6F.

[0139] In this embodiment, since the hydrogen tanks 21, 21 are held by the tank holder 23, the first bonnet 3 covers the entire tank holder 23, thereby also covering the hydrogen tanks 21, 21 held by the tank holder 23.

[0140] In this embodiment, the first bonnet 3 also covers the second cooling device 26 (the second cooling device 26 located in front of the hydrogen tanks 21, 21) attached to the front end of the vehicle body 5. Therefore, a vent 34 is formed in the area of ​​the first bonnet 3 facing the first cooling device 25 (heat exchanger). The vent 34 is an opening that connects the inside and outside of the first bonnet 3, and in this embodiment, a mesh member is placed in the vent 34.

[0141] More specifically, as shown in Figure 24, 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) that are spaced apart laterally and face 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.

[0142] The first front wall 30 and the first rear wall 31 are spaced further apart than the total length of the hydrogen tanks 21, 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, 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. 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 than the outer diameter of the hydrogen tanks 21, 21. In this embodiment, 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 than the total length of the tank holder 23 in the vertical direction.

[0143] The first bonnet 3 is supported by the support frame 9 (vehicle body 5) while covering the hydrogen tanks 21, 21 (tank holders 23) on the support frame 9 (vehicle body 5).

[0144] In this embodiment, the first front wall 30 is provided with a ventilation opening 34. Specifically, the ventilation opening 34 is provided in the region of the first front wall 30 facing the second cooling device 26. A mesh is placed in the ventilation opening 34 to prevent foreign matter from entering the first bonnet 3.

[0145] The entire first bonnet 3 is openable and closable. Specifically, the entire first bonnet 3 is detachable from the vehicle body 5, and it is possible to switch between a state in which the first bonnet 3 is removed and the interior (on top of the vehicle body 5) is open, and a state in which the first bonnet 3 is attached to the vehicle body 5 and the interior (equipment on top of the vehicle body 5, such as hydrogen tanks 21, 21) is covered.

[0146] As shown in Figures 1 and 2, the second bonnet 4 is positioned to correspond to at least one of the front wheels 6F, 6F and the rear wheels 6R, 6R. In this embodiment, the second bonnet 4 is positioned to correspond to the rear wheels 6R, 6R. That is, the second bonnet 4 is positioned above the rear wheels 6R when viewed from the side. Accordingly, the second bonnet 4 covers at least the equipment on the second support portion 90B. In this embodiment, the fuel cell 22 and electrical components EM are positioned on the second support portion 90B. Accordingly, the second bonnet 4 covers the fuel cell 22 and the electrical components EM. In this embodiment, the energy storage device 24... (secondary battery) is positioned so that a portion of it is located within the vehicle frame 50, and as described above, the electrical components EM located below the equipment installation portion 906 are a junction box, inverter, and converter, so these electrical components EM are covered by the second bonnet 4. The front surface of the second bonnet 4 in the longitudinal direction (the front surface of the second front wall 40, which will be described later) is positioned between the front wheels 6F, 6F and the rear wheels 6R, 6R. As a result, in this embodiment, the rear surface of the first bonnet 3 in the longitudinal direction and the front surface of the second bonnet 4 in the longitudinal direction are positioned between the front wheels 6F, 6F and the rear wheels 6R, 6R. The rear surface of the second bonnet 4 in the longitudinal direction is positioned above the rear wheels 6R, 6R (above the rear side wheels 6R, 6R).

[0147] In this embodiment, the second bonnet 4 covers the fuel cell 22 on the equipment installation section 906 and the multiple first cooling devices 25... arranged on the multiple subframes 91, 91, 92. Accordingly, vents 44 are also formed in the region of the second bonnet 4 facing the first cooling devices 25.... The vents 44 are openings that connect the inside and outside of the second bonnet 4, and in this embodiment, a mesh member is placed in the vents 44. Furthermore, in this embodiment, since the second bonnet 4 covers the multiple first cooling devices 25, vents 44 are provided in multiple regions (locations) facing each first cooling device 25.

[0148] More specifically, as shown in Figures 25 and 26, 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) that are spaced apart laterally and face each other. (u) a second front wall 40 and a pair of second side walls 42, 42 connecting both ends of the second front wall 40 and both ends of the second rear wall 41, and a top plate 43 (hereinafter referred to as the second top plate 43) connected to the upper end of the second front wall 40, the upper end of the second rear wall 41 and the upper ends of the pair of second side walls 42, 42, the second top plate 43 closing 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.

[0149] The second front wall 40 and the second rear wall 41 are spaced further apart than the entire length of the second support section 90B in the front-rear direction. In contrast, the pair of second side walls 42, 42 are spaced further apart than the distance between the outer edges of the pair of subframes 91, 91, 92 which are spaced further apart in the lateral direction. In this embodiment, the pair of second side walls 42, 42 are spaced further apart than the entire length of the tank holder 23 in the lateral direction. The vertical lengths (heights) of the second front wall 40, the second rear wall 41, and the second side walls 42, 42 are set to a height that can cover the fuel cell 22 on the equipment installation section 906. That is, the second bonnet 4 is set to be greater than or equal to the distance from the lower end (bottom surface) of the subframes 91, 91, 92 to the top surface of the fuel cell 22 on the equipment installation section 906 in the vertical direction.

[0150] 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 three first cooling devices 25. The second bonnet 4 is supported by the support frame 9, with the fuel cell 22 on the equipment mounting section 906, the electrical components EM located below the fuel cell 22, and the first cooling devices 25 on the subframes 91, 91, 92 all covered together.

[0151] The peripheral wall of the second bonnet 4 is provided with ventilation openings 44 that connect the inside and outside. In this embodiment, the ventilation openings 44 are provided in accordance with the arrangement of the first cooling device 25. That is, in the second bonnet 4, the ventilation openings 44 are provided at positions on the second rear wall 41 and the pair of second side walls 42, 42 that face the first cooling device 25... Mesh is placed in the ventilation openings 44 to prevent foreign matter from entering the second bonnet 4.

[0152] 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 on top of the vehicle body 5, such as the fuel cell 22) is covered.

[0153] As described above, the first bonnet 3 and the second bonnet 4 are arranged in the front-to-back direction, so that, as shown in Figure 27, the first rear wall 31 of the first bonnet 3 and the second front wall 40 of the second bonnet 4 face each other. In this embodiment, the first top plate 33 of the first bonnet 3 is lower in the vertical direction than the second top plate 43 of the second bonnet 4, but the distance between the pair of first side walls 32, 32 and the distance between the pair of second side walls 42, 42 are set to be the same or approximately the same.

[0154] In this embodiment, the work vehicle 1 has the first bonnet 3 and the second bonnet 4 positioned on the vehicle body 5, and the first rear wall 31 of the first bonnet 3 and the second front wall 40 of the second bonnet 4 are located between the front wheel 6F and the rear wheel 6R (above the area between the front wheel 6F and the rear wheel 6R). Furthermore, the first front wall 30 (front) of the first bonnet 3 is located in front of the front wheel 6F, and the second rear wall 41 of the second bonnet 4 is located above the rear wheel 6R.

[0155] As shown in Figure 5, the sensing devices SE1 and SE2 are arranged so as to overlap the edges of the equipment in a plan view. 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, or a combination of cameras and 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.

[0156] Of the multiple sensing devices SE1 and SE2, the sensing device SE2 that is positioned within a predetermined range is positioned above each of the devices (first cooling device 25) that are supported by the subframes 91, 91, and 92 (supports).

[0157] More specifically, the work vehicle 1 of this embodiment includes sensing devices SE1 and SE2, which consist of a first sensing device SE1 attached to the front end of the vehicle body 5 (vehicle body frame 50), and three second sensing devices SE2... arranged on the second bonnet 4. Of the three second sensing devices SE2..., one second sensing device SE2... is set in the lateral center of the rear end of the second top plate 43 of the second bonnet 4, and the remaining two second sensing devices SE2... are installed at both ends of the second top plate 43 of the second bonnet 4. The second sensing devices SE2... arranged on the second top plate 43 of the bonnet are positioned so as to overlap vertically (projectively) with the ends of the equipment (first cooling device 25) located below.

[0158] 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.

[0159] In the above embodiment, the work vehicle 1 was an agricultural tractor as agricultural machinery, but it is not limited to this. For example, if the work vehicle 1 is agricultural machinery, it may be a specialized machine such as a combine harvester or a multi-purpose work vehicle (utility vehicle: UV) in addition to an agricultural tractor. Furthermore, the work vehicle 1 may be a construction vehicle or a civil engineering vehicle.

[0160] In the above embodiment, a work vehicle 1 equipped with two hydrogen tanks 21, arranged side by side (in a row of two columns), was described, but the invention is not limited to this. For example, as shown in Figure 28, the work vehicle 1 may be equipped with three or more hydrogen tanks 21 (four in the figure). In order to stably arrange the hydrogen tanks 21, it is preferable to set the number of hydrogen tanks 21 to a number that can be arranged in a vertical and horizontal alignment (vertical and horizontal directions) (a number that can be arranged in a matrix when viewed from the front: a number that can be arranged in multiple rows and multiple columns).

[0161] In the above embodiment, the first bonnet 3 housing the hydrogen tanks 21, 21 is positioned on the front side of the vehicle body 5 in the longitudinal direction, and the second bonnet 4 housing the fuel cell 22 is positioned on the rear side of the vehicle body 5 in the longitudinal direction, but the embodiment is not limited to this. For example, the first bonnet 3 housing the hydrogen tanks 21, 21 may be positioned on the rear side of the vehicle body 5 in the longitudinal direction, and the second bonnet 4 housing the fuel cell 22 may be positioned on the front side of the vehicle body 5 in the longitudinal direction. In this case, it is preferable that the front surface of the first bonnet 3 and the rear surface of the second bonnet 4 are positioned between the front wheels 6F, 6F and the rear wheels 6R, 6R. Alternatively, if the rear surface of the first bonnet 3 is positioned above the rear wheels 6R, 6R and the front surface of the second bonnet 4 is positioned further forward than the front wheels 6F, 6F in the longitudinal direction, the first bonnet 3 and the second bonnet 4 will be positioned on the vehicle body 5, and the combined configuration of the second bonnet 4 and the first bonnet 3 will be the same as in the above embodiment. Furthermore, as described above, when the first bonnet 3 and the second bonnet 4 are swapped front to back, it goes without saying that the first support portion 90A and the second support portion 90B of the support frame 9 are also swapped front to back.

[0162] In the above embodiment, when viewed from the lateral direction perpendicular to the front-rear direction, the first bonnet 3 is located above the front wheels 6F, 6F (front side wheels 6F, 6F) and the second bonnet 4 is located above the rear wheels 6R, 6R (rear side wheels 6R, 6R), but the embodiment is not limited to this. For example, as described above, the first bonnet 3 and the second bonnet 4 may be swapped front to back, so that when viewed from the lateral direction, the first bonnet 3 is located above the rear wheels 6R, 6R (rear side wheels 6R, 6R) and the second bonnet 4 is located above the front wheels 6F, 6F (front side wheels 6F, 6F).

[0163] Alternatively, the first bonnet 3 may extend in the front-to-rear direction, and the first bonnet 3 and the second bonnet 4 may be arranged side-by-side in the lateral direction, and when viewed from the side, the first bonnet 3 may be positioned above both the front wheels 6F, 6F (front side wheels 6F, 6F) and the rear wheels 6R, 6R (rear side wheels 6R, 6R), while the second bonnet 4 may be positioned above either the front wheels 6F, 6F (front side wheels 6F, 6F) or the rear wheels 6R, 6R (rear side wheels 6R, 6R).

[0164] Alternatively, the second bonnet 4 may extend in the front-to-rear direction, and the first bonnet 3 and the second bonnet 4 may be arranged side-by-side in the lateral direction, with the first bonnet 3 positioned above either the front wheels 6F, 6F (front side wheels 6F, 6F) or the rear wheels 6R, 6R (rear side wheels 6R, 6R) when viewed from the side, and the second bonnet 4 positioned above both the front wheels 6F, 6F (front side wheels 6F, 6F) and the rear wheels 6R, 6R (rear side wheels 6R, 6R). Alternatively, the first bonnet 3 and the second bonnet 4 may each extend in the front-to-back direction, and the first bonnet 3 and the second bonnet 4 may be arranged side-by-side in the lateral direction, with the first bonnet 3 positioned above both the front wheels 6F, 6F (front side wheels 6F, 6F) and the rear wheels 6R, 6R (rear side wheels 6R, 6R) when viewed from the side, and the second bonnet 4 positioned above both the front wheels 6F, 6F (front side wheels 6F, 6F) and the rear wheels 6R, 6R (rear side wheels 6R, 6R).

[0165] In the above embodiment, tires are used for the front wheels 6F, 6F and the rear wheels 6R, 6R, with the front wheels 6F, 6F designated as the front wheels 6F, 6F and the rear wheels 6R, 6R designated as the rear wheels 6R, 6R, but the embodiment is not limited to this. For example, as shown in Figure 29, tires are used for the front wheels 6F, 6F, and a crawler device (endless track running device) is positioned behind the front wheels 6F, 6F (tires) to form a half-crawler type. In this case, the rearmost wheel 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 becomes the rear wheels 6R, 6R.

[0166] Furthermore, the front wheels 6F, 6F and the rear wheels 6R, 6R may be replaced with full crawler type wheels, as shown in Figure 30, with crawler devices positioned below the vehicle body 5. In this case, among the multiple wheels (sprockets (drive wheels), idlers (guider wheels)), the wheels furthest forward in the longitudinal direction become the front wheels 6F, 6F, and the wheels furthest rear in the longitudinal direction become the rear wheels 6R, 6R.

[0167] Therefore, in the above embodiment, the arrangement of the first bonnet 3 and the second bonnet 4 was based on the front wheels 6F, 6F and the rear wheels 6R, 6R. However, in the case of crawler type or half-crawler type vehicles, the front wheels 6F, 6F and the rear wheels 6R, 6R are not limited to tires. In other words, the term "wheel" means "something that rotates attached to the axle of the vehicle and serves to propel the vehicle forward," and therefore includes "wheels" other than tires.

[0168] Furthermore, in the above embodiment, the first sensing device SE1 is attached to the front end (support base 503b) of the vehicle body frame 50, but the invention is not limited to this. For example, as shown in Figure 31, the first sensing device SE1, which is at the very front in the front-rear direction, may be placed on the first bonnet 3 that covers the second cooling device 26, so as to overlap the second cooling device 26 in the vertical direction (so as to be located above the second cooling device 26).

[0169] 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, such as lidar distance 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 automated driving (unmanned driving). Furthermore, the sensing devices SE1 and SE2 mounted on the work vehicle 1 are not limited to one type, but multiple types of sensors can be used and mounted on the work vehicle 1 (vehicle body 2 (vehicle 5)).

[0170] In the above embodiment, the pipes Pa of multiple first cooling devices 25 are connected in series via piping PB1, and the cooling liquid, which is the medium to be cooled, passes through the multiple first cooling devices 25 (heat exchangers 250) in sequence. However, the embodiment is not limited to this. For example, as shown in Figure 32, multiple first cooling devices 25 (pipes Pa) may be connected in parallel, and the medium to be cooled (cooling liquid) flowing from upstream (equipment) may be distributed to the multiple first cooling devices 25 for circulation, and then merged downstream and supplied to the equipment (fuel cell 22).

[0171] In the above embodiment, a work vehicle 1 equipped with three first cooling devices 25 was described, but the number of first cooling devices 25 is not limited to three. For example, one or more first cooling devices 25 may be provided, or two or more may be provided, depending on the desired effect.

[0172] In the above embodiment, the entire first bonnet 3 and the entire second bonnet 4 are configured to be openable and closable, but the embodiment is not limited to this. For example, the entire first bonnet 3 may be configured to be openable and closable, and a part of the second bonnet 4 may be configured to be openable and closable. Alternatively, a part of the first bonnet 3 may be configured to be openable and closable, and the entire second bonnet 4 may be configured to be openable and closable. Here, when a part of the first bonnet 3 is configured to be openable and closable, the part of the first bonnet 3 is made into an openable and closable door. This makes it possible to access the inside of the first bonnet 3, enabling maintenance and inspection of equipment such as hydrogen tanks 21, 21. When a part of the second bonnet 4 is configured to be openable and closable, the part of the second bonnet 4 is made into an openable and closable door. This makes it possible to access the inside of the second bonnet 4, enabling maintenance and inspection of equipment such as fuel cells 22.

[0173] In the above embodiment, the electrical components EM to be cooled by the second cooling device 26 are not limited to inverters, converters, or junction boxes. That is, the electrical components EM to be cooled by the second cooling device 26 can be any component that is liquid-cooled, such as the first motor M1, the second motor M2, or the energy storage device 24. In this case as well, they are incorporated into the circulation path CR2 which includes the second cooling device 26.

[0174] In the above embodiment, the energy storage device 24 is arranged on the vehicle body frame 50, but the embodiment is not limited to this. For example, the energy storage device 24 may be arranged in the second bonnet 4 as equipment other than the hydrogen tank 21 and fuel cell 22. That is, the energy storage device 24 may be arranged on the subframes 91 and 92. Although not specifically mentioned in the description of the above embodiment, since the first cooling device 25 and the second cooling device 26 include an electric motor in the blower, the motor is also housed in the second bonnet 4.

[0175] In the above embodiment, the second cooling device 26 is positioned on the support base 503b of the second side wall connecting portion 503, but the invention is not limited to this. For example, if the second cooling device 26 is positioned on the front side of the hydrogen tank 21, as shown in Figure 33, the support base 503b may be provided to avoid the second cooling device 26, the lower end of the second cooling device 26 may be positioned below the upper surface of the support base 503b, and the second cooling device 26 may be positioned such that it overlaps the hydrogen tank 21 with little or no overlap when viewed from the front or rear direction. In this way, a large free space is formed on the front side of the hydrogen tank 21, making it easier to attach and detach the hydrogen tank 21.

[0176] The above embodiments are as described above, and the present invention (preferred embodiments thereof) provides an agricultural machine or work vehicle 1 as described in the following items (items 1 to 9).

[0177] (Item 1-1) An agricultural machine 1 comprising a vehicle body 5, hydrogen tanks 21, 21 for storing hydrogen, a fuel cell 22 for generating electricity with hydrogen supplied from the hydrogen tanks 21, 21, a first bonnet 3 positioned on the vehicle body 5 and housing the hydrogen tanks 21, 21, and a second bonnet 4 positioned on the vehicle body 5 and housing the fuel cell 22, wherein the first bonnet 3 and the second bonnet 4 are aligned in the front-rear direction of the vehicle body 5.

[0178] According to agricultural machinery 1 of item 1-1, the first bonnet 3 and the second bonnet 4 are arranged in the front-to-rear direction of the vehicle body 5. As a result, the hydrogen tanks 21, 21 in the first bonnet 3 and the fuel cell 22 in the second bonnet 4 are arranged front-to-rear on the vehicle body 5 in accordance with the arrangement of the first bonnet 3 and the second bonnet 4. This allows the hydrogen tanks 21, 21 and the fuel cell 22 to be arranged in series in a plan view, thus arranging them at the shortest distance. This reduces the length of the piping connecting the hydrogen tanks 21, 21 and the fuel cell 22, preventing piping complexity. Furthermore, the hydrogen tanks 21, 21 and the fuel cell 22 do not overlap vertically, making maintenance easier. In addition, since the hydrogen tanks 21, 21 are housed in the first bonnet 3 and the fuel cell 22 is housed in the second bonnet 4, the hydrogen tanks 21, 21 and the fuel cell 22 are properly protected. Therefore, the agricultural machine 1 in item 1 will be arranged in an optimal configuration while properly protecting the hydrogen tanks 21, 21 and the fuel cell 22.

[0179] (Item 1-2) The agricultural machine 1 described in Item 1-1, wherein the second bonnet 4 is positioned on the rear side in the front-rear direction relative to the first bonnet 3.

[0180] According to agricultural machinery 1 of item 1-2, since the second bonnet 4 is positioned rearward relative to the first bonnet 3, the fuel cell 22, which is a heavy object housed in the second bonnet 4, is positioned rearward relative to the hydrogen tanks 21, 21, thus allowing the load of the heavy fuel cell 22 to act on the rearward side of the front and rear.

[0181] (Item 1-3) The agricultural machine 1 according to Item 1-2, comprising a pair of front wheels 6F, 6F arranged at intervals in a lateral direction perpendicular to the front-rear direction, and a pair of rear wheels 6R, 6R arranged at intervals in the lateral direction and positioned on the rear side in the front-rear direction relative to the pair of front wheels 6F, 6F, wherein the rear surface of the first bonnet 3 in the front-rear direction and the front surface of the second bonnet 4 in the front-rear direction are positioned between the front wheels 6F, 6F and the rear wheels 6R, 6R.

[0182] According to agricultural machinery 1 of item 1-3, the rear surface of the first bonnet 3 in the front-rear direction and the front surface of the second bonnet 4 in the front-rear direction are positioned between the front wheels 6F, 6F and the rear wheels 6R, 6R. As a result, the load of the hydrogen tanks 21, 21 acts on the front wheels 6F, 6F, and the load of the fuel cell 22 acts on the rear wheels 6R, 6R, thus optimizing the weight balance acting on the vehicle body 5. In other words, the load of the hydrogen tanks 21, 21 and the load of the fuel cell 22 can be distributed and acted upon the front wheels 6F, 6F and the rear wheels 6R, 6R.

[0183] (Item 1-4) The rear surface of the second bonnet 4 in the front-rear direction is the agricultural machine 1 described in Item 1-3 or Item 1-4, which is positioned on the rear wheels 6R, 6R.

[0184] According to agricultural machinery 1 of item 1-4, the rear surface of the second bonnet 4 in the front-rear direction is positioned on the rear wheels 6R, 6R, thus preventing the second bonnet 4 from protruding significantly to the rear. In addition, the fuel cell 22 is not positioned behind the rear wheels 6R, 6R, allowing the load of the fuel cell 22 to act on the rear wheels 6R, 6R.

[0185] (Item 1-5) The agricultural machine 1 described in Item 1-3, wherein the front surface of the first bonnet 3 in the front-rear direction is positioned in front of the front wheels 6F, 6F.

[0186] According to agricultural machinery 1 of item 1-5, the front of the first bonnet 3 in the front-rear direction is positioned in front of the front wheels 6F, 6F, so that a large space can be secured defined by the first bonnet 3, and the hydrogen tanks 21, 21 can be properly accommodated.

[0187] (Item 1-6) The agricultural machine 1 according to any one of Items 1-1 to 1-5, comprising at least one of a secondary battery, inverter, radiator, motor, and converter housed in at least one of the first bonnet 3 and the second bonnet 4.

[0188] According to item 1-6, agricultural machinery 1, the agricultural machinery is equipped with at least one of a secondary battery, inverter, radiator, motor, and converter, and is housed in at least one of the first bonnet 3 and the second bonnet 4, so that at least one of the electrical equipment (electrical components EM) such as the secondary battery, inverter, radiator, motor, and converter is protected.

[0189] (Item 1-7) An agricultural machine 1 according to any one of Items 1-1 to 1-6, comprising front wheels 6F, 6F and rear wheels 6R, 6R positioned on the rear side in the front-rear direction relative to the front wheels 6F, 6F, wherein the first bonnet 3 is positioned above at least one of the front wheels 6F, 6F and the rear wheels 6R, 6R when viewed from a lateral direction perpendicular to the front-rear direction.

[0190] According to agricultural machinery 1 of item 1-7, the first bonnet 3 is positioned above at least one of the front wheels 6F, 6F and the rear wheels 6R, 6R when viewed from a lateral direction perpendicular to the longitudinal direction. Therefore, the hydrogen tanks 21, 21 inside the first bonnet 3 are also positioned above at least one of the front wheels 6F, 6F and the rear wheels 6R, 6R when viewed from a lateral direction perpendicular to the longitudinal direction. Consequently, the load of the hydrogen tanks 21, 21 can be applied to at least one of the front wheels 6F, 6F and the rear wheels 6R, 6R.

[0191] (Item 1-8) An agricultural machine 1 according to any one of Items 1-1 to 1-7, comprising front wheels 6F, 6F and rear wheels 6R, 6R positioned on the rear side in the front-rear direction relative to the front wheels 6F, 6F, wherein the second bonnet 4 is positioned above at least one of the front wheels 6F, 6F and the rear wheels 6R, 6R when viewed from a lateral direction perpendicular to the front-rear direction.

[0192] According to agricultural machinery 1 of item 1-8, the second bonnet 4 is positioned above at least one of the front wheels 6F, 6F and the rear wheels 6R, 6R when viewed from a lateral direction perpendicular to the longitudinal direction. Therefore, the fuel cell 22 inside the second bonnet 4 is also positioned above at least one of the front wheels 6F, 6F and the rear wheels 6R, 6R when viewed from a lateral direction perpendicular to the longitudinal direction. Consequently, the load of the fuel cell 22 can be applied to at least one of the front wheels 6F, 6F and the rear wheels 6R, 6R.

[0193] (Item 1-9) The agricultural machine 1 described in any one of Items 1-1 to 1-8, wherein all or part of the first bonnet 3 is openable and closable.

[0194] According to agricultural machinery 1 of item 1-9, all or part of the first bonnet 3 is openable and closable, allowing access to the hydrogen tanks 21, 21 inside the first bonnet 3, and enabling maintenance and inspection of the hydrogen tanks 21, 21 and their surrounding equipment.

[0195] (Item 1-10) The agricultural machine 1 described in any one of Items 1-1 to 1-9, wherein all or part of the second bonnet 4 is openable and closable.

[0196] According to agricultural machinery 1 of item 1-10, since all or part of the second bonnet 4 is openable and closable, access to the fuel cell 22 inside the second bonnet 4 becomes possible, and maintenance and inspection of the fuel cell 22 and its peripheral equipment becomes possible.

[0197] (Item 1-11) An agricultural machine 1 according to any one of Items 1-1 to 1-9, comprising a drivable vehicle body 2 including the vehicle body 5, wherein the vehicle body 2 is drivable by at least one of automatic driving and remote control, and is capable of being fitted with a work device WE.

[0198] According to item 1-11, agricultural machinery 1, unmanned operation (driving) becomes possible.

[0199] (Item 2-1) A work vehicle 1 comprising a vehicle body 5, hydrogen tanks 21, 21 provided on the vehicle body 5, a fuel cell 22 provided on the vehicle body 5 and which generates electricity using hydrogen supplied from the hydrogen tanks 21, 21, and a plurality of ventilated cooling devices for cooling at least one of the hydrogen tanks 21, 21 and the fuel cell 22, wherein the plurality of ventilated cooling devices are arranged on the vehicle body 5 such that the direction of the cooling airflow is different.

[0200] According to the work vehicle 1 of item 2-1, since it is equipped with multiple ventilated cooling devices, the cooling (heat exchange) of at least one of the hydrogen tanks 21, 21 and the fuel cell 22 is shared among the multiple ventilated cooling devices. Furthermore, since the multiple ventilated cooling devices are arranged on the vehicle body 5 so that the direction of the cooling airflow is different for each of the multiple ventilated cooling devices, the intake (air inflow) and exhaust (air outflow) directions of each of the multiple ventilated cooling devices are not the same, and the heat impact on the surroundings can be dispersed. Therefore, according to the work vehicle 1 of item 2-1, the heat impact of the exhaust from the ventilated cooling devices on the surroundings can be reduced.

[0201] (Item 2-2) The work vehicle 1 described in Item 2-1, wherein the plurality of ventilation type cooling devices are arranged such that the direction of the blown cooling air is directed outward from the vehicle body 5.

[0202] According to the work vehicle 1 in item 2-2, the direction of the cooling air blown out by each of the multiple ventilated cooling units is directed outwards from the vehicle body 5, so that the heated air (cooling air) is exhausted to the outside. This makes it possible to suppress the thermal impact on equipment surrounding each of the multiple ventilated cooling units.

[0203] (Item 2-3) A work vehicle 1 according to Item 2-1 or Item 2-2, comprising at least one pair of wheels 6F, 6R arranged on both sides perpendicular to the front-rear direction of the vehicle body 5 and supported by the vehicle body 5, wherein at least one of the plurality of ventilated cooling devices is arranged above at least one of the pair of wheels 6F, 6R.

[0204] According to the work vehicle 1 of item 2-3, at least one ventilated cooling device is positioned above the wheels 6F and 6R, thereby suppressing the thermal impact of the ventilated cooling device on the equipment on the vehicle body 5.

[0205] (Item 2-4) The work vehicle 1 according to Item 2-3, comprising, as the at least pair of wheels 6F, 6R, a pair of front wheels 6F, 6F supported at the front of the vehicle body 5, and a pair of rear wheels 6R, 6R positioned behind the pair of front wheels 6F, 6F, wherein the ventilated cooling device is positioned above at least one of the pair of rear wheels 6R, 6R.

[0206] According to the work vehicle 1 of item 2-4, at least one ventilated cooling device is positioned above the rear wheels 6R, 6R, thereby suppressing the thermal impact of the ventilated cooling device on the equipment on the vehicle body 5.

[0207] (Item 2-5) The work vehicle 1 described in any one of Items 2-1 to 2-4, wherein the upper surface of the ventilated cooling device is located higher than the upper surfaces of the hydrogen tanks 21, 21.

[0208] According to the work vehicle 1 of item 2-5, the upper surface of the ventilated cooling device is located higher than the upper surfaces of the hydrogen tanks 21, 21, so that all or part of the air intake and exhaust by the ventilated cooling device occurs above the hydrogen tanks 21, 21. This suppresses the thermal impact on the hydrogen tanks 21, 21.

[0209] (Item 2-6) The work vehicle 1 described in any one of Items 2-1 to 2-5, wherein the plurality of ventilated cooling devices are arranged to surround the fuel cell 22.

[0210] According to the work vehicle 1 of item 2-6, the multiple ventilated cooling devices are arranged to surround the fuel cell 22, so that a ventilation path is formed around the fuel cell 22 for each of the multiple ventilated cooling devices. This allows the heat generated by the fuel cell 22 due to power generation to be discharged by the flow of cooling air.

[0211] (Item 2-7) A work vehicle 1 according to any one of Items 2-1 to 2-7, comprising an electrical component EM and a ventilated cooling device for cooling the electrical component EM, separate from the ventilated cooling device.

[0212] According to the work vehicle 1 of item 2-7, in addition to a ventilated cooling device for cooling at least one of the hydrogen tanks 21, 21 and the fuel cell 22, it is equipped with a ventilated cooling device for cooling the electrical component EM, so that the cooling of at least one of the hydrogen tanks 21, 21 and the fuel cell 22 and the cooling of the electrical component EM can be performed separately. In other words, it is possible to prevent the cooling of at least one of the hydrogen tanks 21, 21 and the fuel cell 22 from affecting the cooling of the electrical component EM, and vice versa.

[0213] (Item 3-1: First Invention) A work vehicle 1 comprising a vehicle frame 50 supporting a plurality of wheels 6F, 6R, hydrogen tanks 21, 21, a fuel cell 22 that generates electricity using hydrogen supplied from the hydrogen tanks 21, 21, and a support frame 9 that supports at least one of the hydrogen tanks 21, 21 and the fuel cell 22, wherein the support frame 9 is provided extending from the front to the rear in the longitudinal direction of the vehicle frame 50.

[0214] According to the work vehicle 1 of item 3-1, a support frame 9 that supports at least one of the hydrogen tanks 21, 21 and the fuel cell 22 is provided extending from the front to the rear in the longitudinal direction of the vehicle frame 50. This allows the load of at least one of the heavy hydrogen tanks 21, 21 and the fuel cell 22 to be properly applied to the vehicle frame 50 that supports multiple wheels 6F, 6R. As a result, the work vehicle 1 of item 3-1 can achieve good weight balance.

[0215] (Item 3-2) The work vehicle 1 according to Item 3-1, wherein the plurality of wheels 6F, 6R include front wheels 6F, 6F and rear wheels 6R, 6R arranged at intervals in the front-rear direction, and the vehicle body frame 50 supports at least the front wheels 6F, 6F.

[0216] According to the work vehicle 1 of item 3-2, since the vehicle frame 50 supports at least the front wheels 6F, 6F, at least one load from the hydrogen tanks 21, 21 and the fuel cell 22 acting via the support frame 9 can be applied to the front wheels 6F, 6F via the vehicle frame 50.

[0217] (Item 3-3) The work vehicle 1 described in Item 3-2, wherein a gear case 51 is provided at the rear of the vehicle body frame 50 in the front-rear direction, and the gear case 51 supports the rear wheels 6R, 6R.

[0218] According to the work vehicle 1 of item 3-3, since the gear case 51 supports the rear wheels 6R, 6R, at least one load from the hydrogen tanks 21, 21 and the fuel cell 22 acting via the support frame 9 can be applied to the rear wheels 6R, 6R via the gear case 51.

[0219] (Item 3-4) The support frame 9 is a work vehicle 1 according to any one of items 3-1 to 3-3 that supports the hydrogen tanks 21, 21 and the fuel cell 22.

[0220] According to the work vehicle 1 of item 3-4, the support frame 9 supports the hydrogen tanks 21, 21 and the fuel cell 22, so that the load of the heavy hydrogen tanks 21, 21 and the fuel cell 22 can be properly applied to the vehicle frame 50 which supports multiple wheels 6F, 6R.

[0221] (Item 3-5) The front end of the support frame 9 in the front-rear direction is connected to the vehicle body frame 50, and the rear end of the support frame 9 in the front-rear direction is connected to the gear case 51, as described in Item 3-3, or Item 3-4 which references Item 3-3.

[0222] According to the work vehicle 1 in item 3-5, 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. Therefore, the load acting on the support frame 9 can be distributed and applied to the front and rear of the vehicle body 5 (vehicle body frame 50, gear case 51).

[0223] (Item 3-6) The support frame 9 is positioned at least between the front wheels 6F, 6F and the rear wheels 6R, 6R, as described in Item 3-2, or any one of Items 3-3 to 3-5 that references Item 3-2.

[0224] According to the work vehicle 1 of item 3-6, the support frame 9 is positioned at least between the front wheels 6F, 6F and the rear wheels 6R, 6R, so that the load acting on the support frame 9 can be distributed and applied to the front wheels 6F, 6F and the rear wheels 6R, 6R.

[0225] (Item 4-1: Second Invention) A work vehicle 1 comprising a vehicle frame 50 supporting a plurality of wheels 6F, 6R, a gear case 51 positioned in front of or behind the vehicle frame 50, and a first motor M1 that transmits power to at least one of the wheels 6F, 6R and the gear case 51, wherein the first motor M1 is positioned between the vehicle frame 50 and the gear case 51.

[0226] According to the work vehicle 1 of item 4-1, the first motor M1 is positioned between the vehicle frame 50 and the gear case 51 which is located in front of or behind the vehicle frame 50, so that the vehicle frame 50, the first motor M1, and the gear case 51 are arranged in series. As a result, the first motor M1 is not positioned above the vehicle frame 50 or the gear case 51, and the arrangement of other equipment is not restricted. This allows the work vehicle 1 of item 4-1 to optimize the motor arrangement and achieve a compact design.

[0227] (Item 4-2) The work vehicle 1 described in Item 4-1, wherein each of the vehicle frame 50 and the gear case 51 is provided with plate portions 500, 510 that are spaced apart in the front-rear direction and face each other, and the first motor M1 is positioned between the plate portions 500, 510 of the vehicle frame 50 and the plate portions 500, 510 of the gear case 51.

[0228] According to the work vehicle 1 of item 4-2, the first motor M1 is positioned between the plate portions 500 and 510 of the vehicle frame 50 and the plate portion 510 of the gear case 51 (between the plate portions 500 and 510 facing each other), so that the space for positioning the first motor M1 is properly defined.

[0229] (Item 4-3) The work vehicle 1 according to Item 4-2, further comprising a connecting member 55 that connects the plate portions 500, 510 of the vehicle body frame 50 and the plate portions 500, 510 of the gear case 51.

[0230] According to the work vehicle 1 of item 4-3, a connecting member 55 is provided to connect the plate portion 500 of the vehicle frame 50 and the plate portion 510 of the gear case 51. Therefore, even if the first motor M1 is positioned between the vehicle frame 50 and the gear case 51, the vehicle frame 50 (plate portions 500, 510) and the gear case 51 (plate portions 500, 510) become integrally integrated.

[0231] (Item 4-4) A work vehicle 1 according to any one of items 4-1 to 4-3, comprising hydrogen tanks 21, 21 arranged on the vehicle body frame 50, and a fuel cell 22 that generates electricity using hydrogen supplied from the hydrogen tanks 21, 21, wherein the first motor M1 is located below the hydrogen tanks 21, 21 and rotates by receiving power from the fuel cell 22.

[0232] According to the work vehicle 1 of item 4-4, the first motor M1 is driven below the hydrogen tanks 21, 21 and transmits power to at least one of the wheels 6F, 6R and the gear case 51.

[0233] (Item 4-5) The work vehicle 1 according to Item 4-4, comprising: device connecting parts 700, 710 to which a work device WE that performs a predetermined task can be connected; a PTO shaft 20 that transmits power to the work device WE connected to the device connecting parts 700, 710; and a second motor M2 that receives power from the fuel cell 22 to rotate the PTO shaft 20, wherein the first motor M1 and the second motor M2 are arranged side by side in the lateral direction perpendicular to the vertical and front-rear directions.

[0234] In the work vehicle 1 of item 4-5, the power of the second motor M2 is transmitted to the work device WE connected to the device connection parts 700 and 710 via the PTO shaft 20, so that the work device WE can be operated properly. Furthermore, since the first motor M1 and the second motor M2 are arranged side by side in the lateral direction perpendicular to the vertical and longitudinal directions, the second motor M2 is also positioned in front of or behind the vehicle frame 50. As a result, the first motor M1 and the second motor M2 are not positioned above the vehicle frame 50 or the gear case 51, and the arrangement of other equipment is not restricted. As a result, the work vehicle 1 of item 4-5 can optimize the arrangement of motors and achieve a compact design.

[0235] (Item 5-1: Third Invention) A work vehicle 1 comprising a vehicle body 5, hydrogen tanks 21, 21, a fuel cell 22 that generates electricity using hydrogen supplied from the hydrogen tanks 21, 21, a main frame 90 provided on the vehicle body 5 and supporting at least one of the hydrogen tanks 21, 21 and the fuel cell 22, and subframes 91, 91, 92 attached to the main frame 90 and supporting equipment other than the hydrogen tanks 21, 21 and the fuel cell 22, spaced apart from the main frame 90.

[0236] According to the work vehicle 1 of item 5-1, the main frame 90 provided on the vehicle body 5 supports at least one of the hydrogen tanks 21, 21 and the fuel cell 22, and equipment other than the hydrogen tanks 21, 21 and the fuel cell 22 is supported by subframes 91, 91, 92, spaced apart from the main frame 90. In other words, the equipment other than the hydrogen tanks 21, 21 and the fuel cell 22 is arranged in a separate area (subframes 91, 91, 92) away from the area where the hydrogen tanks 21, 21 and the fuel cell 22 are supported, so that the equipment is not densely packed and is optimally arranged.

[0237] Therefore, the work vehicle 1 of item 5-1 can optimally arrange equipment other than the hydrogen tanks 21, 21 and the fuel cell 22.

[0238] (Item 5-2) The work vehicle 1 according to Item 5-1, comprising a cooling device 25 for cooling at least one of the hydrogen tanks 21, 21 and the fuel cell 22, wherein the subframes 91, 91, 92 support the cooling device 25.

[0239] According to the work vehicle 1 of item 5-2, the cooling device 25 is supported by the subframes 91, 91, 92, so the cooling device 25 is positioned at a distance from at least one of the hydrogen tanks 21, 21 and the fuel cell 22. This optimizes the placement of the cooling device 25. In other words, the cooling device 25 is positioned in an optimal location so that the heat exchange caused by the cooling of at least one of the hydrogen tanks 21, 21 and the fuel cell 22 does not affect the hydrogen tanks 21, 21 or the fuel cell 22.

[0240] (Item 5-3) A work vehicle 1 according to Item 5-1 or Item 5-2, comprising at least one pair of wheels 6F, 6R arranged on both sides perpendicular to the front-rear direction of the vehicle body 5 and supported by the vehicle body 5, wherein the subframes 91, 91, 92 support the equipment above at least one of the pair of wheels 6F, 6R.

[0241] According to the work vehicle 1 of item 5-3, the subframes 91, 91, 92 support the equipment above the wheels 6F, 6R located on the sides of the vehicle body 5, so the empty space above the wheels 6F, 6R is effectively utilized as space for arranging the equipment.

[0242] (Item 5-4) The work vehicle 1 according to Item 5-3, comprising, as the at least pair of wheels 6F, 6R, a pair of front wheels 6F, 6F supported at the front of the vehicle body 5, and a pair of rear wheels 6R, 6R positioned behind the pair of front wheels 6F, 6F, wherein the subframes 91, 91, 92 support the equipment above at least one of the pair of rear wheels 6R, 6R.

[0243] According to the work vehicle 1 of item 5-4, the subframes 91, 91, and 92 support the equipment above the rear wheels 6R, 6R of the wheels 6F, 6R located on the side of the vehicle body 5, so the empty space above the rear wheels 6R, 6R is effectively used as space for placing the equipment.

[0244] (Item 5-5) The work vehicle 1 according to Item 5-2, Item 5-3 or Item 5-4, wherein the hydrogen tanks 21, 21 are supported by the main frame 90, and the subframes 91, 91, 92 support the cooling device 25 such that the upper end of the cooling device 25 is located above the upper end of the hydrogen tanks 21, 21.

[0245] According to the work vehicle 1 of item 5-5, the subframes 91, 91, 92 support the cooling device 25 such that the upper end of the cooling device 25 is located above the upper ends of the hydrogen tanks 21, 21 supported by the main frame 90. Thus, the cooling device 25 is positioned in an optimal location that does not affect the hydrogen tanks 21, 21 or the fuel cell 22 with the heat exchange caused by the cooling of at least one of the hydrogen tanks 21, 21 or the fuel cell 22.

[0246] (Item 5-6) A work vehicle 1 according to any one of items 5-1 to 5-5, wherein the electrical component EM is located at a lower position than the equipment supported by the subframes 91, 91, 92.

[0247] According to the work vehicle 1 of item 5-6, the electrical component EM is positioned lower than the equipment supported by the subframes 91, 91, and 92, making it less susceptible to the influence of the equipment on the subframes 91, 91, and 92.

[0248] (Item 6-1) A work vehicle 1 comprising a vehicle body 5, hydrogen tanks 21, 21 provided on the vehicle body 5, a fuel cell 22 provided on the vehicle body 5 and which generates electricity using hydrogen supplied from the hydrogen tanks 21, 21, and a plurality of energy storage devices 24... for storing the electricity generated by the fuel cell 22, wherein the plurality of energy storage devices 24... are arranged either vertically or horizontally along the longitudinal direction of the hydrogen tanks 21, 21.

[0249] According to the work vehicle 1 of item 6-1, the multiple energy storage devices 24... are arranged either vertically or horizontally along the longitudinal direction of the hydrogen tanks 21, 21, so that the multiple energy storage devices 24... are arranged in a single line. This makes it easy to connect the multiple energy storage devices 24.... Therefore, according to the work vehicle 1 of item 6-1, the arrangement of the multiple energy storage devices 24... can be optimized.

[0250] (Item 6-2) The plurality of energy storage devices 24... are located below the hydrogen tanks 21, 21 in the work vehicle 1 described in Item 6-1.

[0251] According to the work vehicle 1 of item 6-2, multiple energy storage devices 24... are arranged below the hydrogen tanks 21, 21, so the space below the hydrogen tanks 21, 21 is effectively utilized.

[0252] (Item 6-3) A work vehicle 1 according to Item 6-2, comprising an electrical component EM and a ventilated cooling device for the electrical component EM for cooling the electrical component EM, wherein a gap is formed between the hydrogen tanks 21, 21 and the plurality of energy storage devices 24... that allows for ventilation in the front-rear direction, and the ventilated cooling device for the electrical component EM is arranged so that the ventilation direction and ventilation position correspond to the gap.

[0253] According to the work vehicle 1 of item 6-3, the gap between the hydrogen tanks 21, 21 and the multiple energy storage devices 24... becomes a ventilation passage, allowing air to enter and exit the ventilation position of the ventilated cooling device for the electrical components EM. In other words, obstruction to the entry and exit of cooling air to and from the ventilated cooling device for the electrical components EM is prevented.

[0254] (Item 6-4) The work vehicle 1 according to Item 6-3, wherein a support frame 9 for supporting the hydrogen tanks 21, 21 is provided between the hydrogen tanks 21, 21 and the plurality of energy storage devices 24..., the support frame 9 forms the gap, and a ventilation-side cooling device for the electrical components EM is attached to either end in the front-rear direction.

[0255] According to the work vehicle 1 of item 6-4, the support frame 9 supporting the hydrogen tanks 21, 21 forms a gap that serves as a ventilation passage, and the ventilation-side cooling device for the electrical equipment EM is attached to the end of the support frame 9, so that the relative positional relationship between the gap (ventilation passage) and the ventilation-side cooling device for the electrical equipment EM can be kept constant.

[0256] (Item 6-5) The work vehicle 1 according to Item 6-4, wherein the support frame 9 is provided on the vehicle body 5 and includes a main frame 90 that supports at least one of the hydrogen tanks 21, 21 and the fuel cell 22, and subframes 91, 91, 92 that are attached to the main frame 90 and support equipment other than the hydrogen tanks 21, 21 and the fuel cell 22 at a distance from the main frame 90, and the ventilated cooling device for the electrical equipment EM is attached to one end of the main frame 90 in the front-rear direction, and the subframes 91, 91, 92 are attached to the other end of the main frame 90 in the front-rear direction.

[0257] According to the work vehicle 1 of item 6-5, the main frame 90 supporting at least one of the hydrogen tanks 21, 21 and the fuel cell 22 forms a gap that serves as a ventilation passage, and a ventilation-side cooling device for the electrical components EM is attached to one end of the main frame 90, so that the relative positional relationship between the gap (ventilation passage) and the ventilation-side cooling device for the electrical components EM can be kept constant.

[0258] (Item 7-1: Fourth Invention) A work vehicle 1 comprising a vehicle body 5, hydrogen tanks 21, 21, a fuel cell 22 that generates electricity using hydrogen supplied from the hydrogen tanks 21, 21, a motor that rotates using electricity generated by the fuel cell 22, a cooling device 25 that cools at least one of the hydrogen tanks 21, 21 and the fuel cell 22, a main frame 90 provided on the vehicle body 5 and supporting at least one of the hydrogen tanks 21, 21 and the fuel cell 22, subframes 91, 91, 92 attached to the main frame 90 and supporting the cooling device 25 at a distance from the main frame 90, and an electrical component EM disposed between the main frame 90 and the subframes 91, 91, 92 and controlling at least one of the hydrogen tanks 21, 21, the fuel cell 22, the motor and the cooling device 25.

[0259] According to the work vehicle 1 of item 7-1, the electrical component EM is positioned between the main frame 90, which supports at least one of the hydrogen tanks 21, 21 and the fuel cell 22, and the subframes 91, 91, 92, which support the cooling device 25 at a distance from the main frame 90. As a result, the electrical component EM is less susceptible to the influence (thermal influence) of the cooling device 25, and the performance of the electrical component EM can be maintained. In other words, the work vehicle 1 of item 7-1 allows for the optimal arrangement of the electrical component EM.

[0260] (Item 7-2) The work vehicle 1 according to Item 7-1, wherein the main frame 90 includes a first support portion 90A that supports the hydrogen tanks 21, 21 and a second support portion 90B that is aligned in the front-rear direction with respect to the first support portion and supports the fuel cell 22, the upper end of the second support portion 90B is configured to support the fuel cell 22 above the support position of the hydrogen tanks 21, 21 by the first support portion 90A, and the second support portion 90B is configured to allow the electrical component EM to be positioned below the fuel cell 22.

[0261] According to the work vehicle 1 of item 7-2, the main frame 90 includes a first support section 90A that supports hydrogen tanks 21, 21 and a second support section 90B that supports the fuel cell 22. The second support section 90B is configured to allow electrical components EM to be placed below the fuel cell 22, so that the electrical components EM are placed below the fuel cell 22. This also suppresses the effects of heat generation (hot air) from the fuel cell 22 on the electrical components EM.

[0262] (Item 7-3) The work vehicle 1 according to Item 7-2, wherein the subframes 91, 91, 92 are connected to the upper end of the second support portion 90B and extend in a direction perpendicular to the vertical direction with respect to the second support portion 90B.

[0263] According to the work vehicle 1 of item 7-3, the subframes 91, 91, 92 extend from the main frame 90 in a direction perpendicular to the vertical direction (lateral or longitudinal direction), so the cooling device 25 is supported by the subframes 91, 91, 92 outside the main frame 90. As a result, the cooling device 25 is positioned away from the electrical components EM and the cooling device 25, so that the electrical components EM are not affected by the cooling device 25. In addition, since the fuel cell 22 is supported at a high position by the second support part 90B, the electrical components EM are not affected by the fuel cell 22, so that that is also not prevented.

[0264] (Item 7-4) The work vehicle 1 according to Item 7-2 or Item 7-3, wherein the first support portion 90A is positioned in front of the second support portion 90B in the front-rear direction, and the hydrogen tanks 21, 21 are positioned in front of the electrical equipment EM.

[0265] According to the work vehicle 1 of item 7-4, the hydrogen tanks 21, 21 are positioned in front of the electrical equipment EM, so the space is used effectively.

[0266] (Item 7-5) The work vehicle 1 according to any one of Items 7-1 to 7-4, wherein the vehicle body 5 includes a vehicle body frame 50 that supports a plurality of wheels 6F, 6R, and a gear case 51 positioned in front of or behind the vehicle body frame 50, and the motor is positioned below the electrical component EM and transmits power to at least one of the wheels 6F, 6R and the gear case 51.

[0267] According to the work vehicle 1 in item 7-5, the motor is positioned below the electrical component EM, so the motor is positioned relatively close to the electrical component EM. This results in shorter wiring and less energy loss.

[0268] (Item 7-6) The work vehicle 1 described in Item 7-5, which is equipped with a power storage device 24... that stores the electricity generated by the fuel cell 22 and supplies the stored electricity to the motor, wherein the power storage device 24... is located below the electrical equipment EM.

[0269] According to the work vehicle 1 in item 7-6, the energy storage device 24... is positioned below the electrical components EM. This results in shorter wiring and less energy loss.

[0270] (Item 8-1) A work vehicle 1 comprising a vehicle body 5 that supports the front wheels 6F, 6F and the rear wheels 6R, 6R, hydrogen tanks 21, 21 provided on the vehicle body 5, a fuel cell 22 that generates electricity using hydrogen supplied from the hydrogen tanks 21, 21, a support provided on the vehicle body 5 and above the rear wheels 6R, 6R that supports the equipment, and sensing devices SE1, SE2 positioned above the equipment.

[0271] According to the work vehicle 1 of item 8-1, the sensing devices SE1 and SE2 are positioned above the equipment supported by a support above the rear wheels 6R, 6R, so that the sensing devices SE1 and SE2 are positioned near the outer perimeter of the work vehicle 1 in a plan view. As a result, there are no obstructions when the sensing devices SE1 and SE2 monitor (sens) the outside of the work vehicle 1, and they can perform sensing well.

[0272] (Item 8-2) The work vehicle 1 described in Item 8-1, wherein the sensing devices SE1 and SE2 are arranged to overlap the ends of the equipment in a plan view.

[0273] According to the work vehicle 1 of item 8-2, the sensing devices SE1 and SE2 are arranged so as to overlap the ends of the equipment in a plan view, so there is nothing to obstruct the sensing devices SE1 and SE2 when they monitor (sens) the outside of the work vehicle 1, and they can perform sensing well.

[0274] (Item 8-3) The sensing devices SE1 and SE2 are capable of detecting the state of the area around the vehicle body 5, and the work vehicle 1 is as described in Item 8-1 or Item 8-2.

[0275] According to the work vehicle 1 in item 8-3, the sensing devices SE1 and SE2 can detect the conditions around the vehicle body 5, making the work vehicle 1 highly safe.

[0276] (Item 8-4) The sensing devices SE1 and SE2 are cameras, as described in Item 8-3, for the work vehicle 1.

[0277] According to the work vehicle 1 in item 8-4, since the sensing devices SE1 and SE2 are cameras, they can capture an image of the surrounding situation of the vehicle body 5 (work vehicle 1).

[0278] (Item 8-5) The sensing devices SE1 and SE2 are lidar, and the work vehicle 1 is as described in Item 8-3.

[0279] According to the work vehicle 1 in item 8-5, since the sensing devices SE1 and SE2 are lidar, the distance to objects around the vehicle body 5 (work vehicle 1) and the position of those objects can be accurately determined.

[0280] (Item 8-6) The work vehicle 1 according to any one of Items 8-1 to 8-5, wherein the rear wheels 6R, 6R are provided on both sides of the vehicle body 5 in the lateral direction perpendicular to the longitudinal direction, the support supports the equipment above each of the rear wheels 6R, 6R, and the sensing devices SE1, SE2 are positioned above each of the equipment.

[0281] According to the work vehicle 1 of item 8-6, sensing devices SE1 and SE2 are positioned above each of the pair of rear wheels 6R, 6R located on both sides of the vehicle body 5 in the lateral direction perpendicular to the longitudinal direction, and above the equipment located above each of the pair of rear wheels 6R, 6R. This allows for proper monitoring of both sides of the vehicle body 5 in the lateral direction, thereby increasing safety.

[0282] (Item 8-7) The work vehicle 1 according to any one of items 8-1 to 8-6, wherein the equipment is a cooling device 25 for cooling at least one of the hydrogen tanks 21, 21 and the fuel cell 22.

[0283] According to the work vehicle 1 of item 8-7, the equipment located below the sensing devices SE1 and SE2 is a cooling device 25 that cools at least one of the hydrogen tanks 21, 21 and the fuel cell 22. Therefore, at least one of the hydrogen tanks 21, 21 and the fuel cell 22 can be properly cooled without impairing the sensing performance of the sensing devices SE1 and SE2.

[0284] (Item 9-1) A work vehicle 1 comprising a vehicle frame 50 supporting a plurality of wheels 6F, 6R, a gear case 51 positioned in front of or behind the vehicle frame 50, hydrogen tanks 21, 21, a fuel cell 22 that generates electricity using hydrogen supplied from the hydrogen tanks 21, 21, and an energy storage device 24... that stores the electricity generated by the fuel cell 22, wherein at least a portion of the energy storage device 24... is positioned within the vehicle frame 50, and the hydrogen tanks 21, 21 are positioned above the vehicle frame 50.

[0285] According to the work vehicle 1 of item 9-1, at least a portion of the energy storage device 24... is located within the vehicle frame 50, and the hydrogen tanks 21, 21 are located above the vehicle frame 50, so the energy storage device 24... does not obstruct the placement of the hydrogen tanks 21, 21. Also, since at least a portion of the energy storage device 24... is located within the vehicle frame 50 and below the hydrogen tanks 21, 21, the energy storage device 24... is not present in the direction (forward, backward, sideways, upward) in which the hydrogen tanks 21, 21 are moved when attaching or detaching them. Therefore, the work vehicle 1 of item 9-1 can be equipped with a large-capacity energy storage device 24... while allowing for smooth attachment and detachment of the hydrogen tanks 21, 21.

[0286] (Item 9-2) The vehicle body frame 50 has a pair of side walls 501, 501 that are spaced apart and facing each other in the lateral direction perpendicular to the front-rear direction, and all or part of the energy storage device 24... is arranged between the pair of side walls 501, 501, the work vehicle 1 as described in Item 9-1.

[0287] According to the work vehicle 1 of item 9-2, all or part of the energy storage device 24... is positioned between a pair of side walls 501, 501, so that the upper surface (upper end) of the energy storage device 24... is positioned close to the upper end of the vehicle frame 50. As a result, the area occupied by the energy storage device 24... on the vehicle frame 50 is reduced or eliminated, making it easier to move the hydrogen tanks 21, 21 when attaching or detaching them.

[0288] (Item 9-3) The work vehicle 1 according to Item 9-1 or Item 9-2, wherein the hydrogen tanks 21, 21 are detachable from the vehicle frame 50 and are movable in at least two directions, vertically and longitudinally, when attached or detached.

[0289] According to the work vehicle 1 of item 9-3, the hydrogen tanks 21, 21 are detachable from the vehicle frame 50 and can move in at least two directions, vertically and longitudinally, when attached or detached. This reduces the restrictions on movement of the hydrogen tanks 21, 21 when attached or detached, and allows for easy attachment and detachment of the hydrogen tanks 21, 21.

[0290] (Item 9-4) A work vehicle 1 according to any one of Items 9-1 to 9-3, comprising a tank holder 23 for holding the hydrogen tanks 21, 21, wherein the tank holder 23 is directly or indirectly supported by the vehicle frame 50 and is detachably attached to the vehicle frame 50 together with the hydrogen tanks 21, 21.

[0291] According to the work vehicle 1 of item 9-4, the hydrogen tanks 21, 21 are attached to and detached from the vehicle frame 50 by attaching and detaching the tank holder 23 to the vehicle frame 50. In addition, by providing the tank holder 23, multiple hydrogen tanks 21, 21 can be held together.

[0292] (Item 9-5) The work vehicle 1 according to Item 9-4, comprising a support frame 9 provided on the vehicle body frame 50, wherein the tank holder 23 is detachable from the support frame 9.

[0293] According to the work vehicle 1 of item 9-5, the hydrogen tanks 21, 21 are supported on the support frame 9 via the tank holder 23, and the support frame 9 is supported on the vehicle body frame 50. Since the tank holder 23 is detachable from the support frame 9, the hydrogen tanks 21, 21 are attached to and detached from the support frame 9 (vehicle body frame 50) by attaching and detaching the tank holder 23 from the support frame 9.

[0294] 1: Work vehicle 2: Vehicle body 3: First bonnet 4: Second bonnet 5: Body 6F: Front wheels (wheels, front wheels) 6R: Rear wheels (wheels, rear wheels) 7: Impulse support mechanism 8: Control device 9: Support frame 20: PTO shaft 21: Hydrogen tank 22: Fuel cell 23: Tank holder 24: Energy storage device 25: Cooling device (first cooling device) 26: Cooling device (second cooling device) 34: Vent 44: Vent 50: Body frame 51: Gear case 52: Steering device 55: Connecting member 90: Main frame 91: Subframe (first subframe) 92: Subframe (second subframe) 240a: Intake section 250: Heat exchanger 251 : Blower 500 : Plate section (first plate section) 510 : Plate section (second plate section) 511 : Rear axle 700 : Device connection section 710 : Device connection section 906 : Equipment installation section 910 : Bracket BM : Battery module EM : Electrical components SE1 : Sensing device (first sensing device) SE2 : Sensing device (second sensing device) WE : Working device (working implement)

Claims

1. A work vehicle comprising: a vehicle frame supporting multiple wheels; a hydrogen tank; a fuel cell that generates electricity using hydrogen supplied from the hydrogen tank; and a support frame that supports at least one of the hydrogen tank and the fuel cell, wherein the support frame is provided extending from the front to the rear in the longitudinal direction of the vehicle frame.

2. The work vehicle according to claim 1, wherein the plurality of wheels include front wheels and rear wheels arranged at intervals in the front-rear direction, and the vehicle frame supports at least the front wheels.

3. The work vehicle according to claim 2, wherein a gear case is provided at the rear of the vehicle frame in the front-rear direction, and the gear case supports the rear wheel.

4. The work vehicle according to claim 1, wherein the support frame supports the hydrogen tank and the fuel cell.

5. The work vehicle according to claim 3, wherein the front end of the support frame in the longitudinal direction is connected to the vehicle body frame, and the rear end of the support frame in the longitudinal direction is connected to the gear case.

6. A work vehicle comprising: a body frame supporting a plurality of wheels; a gear case positioned in front of or behind the body frame; and a first motor that transmits power to at least one of the wheels and the gear case, wherein the first motor is positioned between the body frame and the gear case.

7. The vehicle body frame and the gear case each have plate portions that face each other with a gap between them in the front-rear direction, and the first motor is positioned between the plate portion of the vehicle body frame and the plate portion of the gear case, as described in claim 6.

8. The work vehicle according to claim 7, further comprising a connecting member that connects the plate portion of the vehicle body frame and the plate portion of the gear case.

9. The work vehicle according to claim 6, comprising a hydrogen tank positioned on the vehicle body frame and a fuel cell that generates electricity using hydrogen supplied from the hydrogen tank, wherein the first motor is positioned below the hydrogen tank and rotates by receiving power from the fuel cell.

10. The work vehicle according to claim 9, comprising: a device connection section to which a work device for performing a predetermined task can be connected; a PTO shaft for transmitting power to the work device connected to the device connection section; and a second motor that receives power from the fuel cell and rotates the PTO shaft, wherein the first motor and the second motor are arranged side by side in a lateral direction perpendicular to the vertical and longitudinal directions.

11. A work vehicle comprising: a vehicle body; a hydrogen tank; a fuel cell that generates electricity using hydrogen supplied from the hydrogen tank; a main frame provided on the vehicle body and supporting at least one of the hydrogen tank and the fuel cell; and a subframe attached to the main frame and supporting equipment other than the hydrogen tank and the fuel cell, spaced apart from the main frame.

12. The work vehicle according to claim 11, comprising a cooling device for cooling at least one of the hydrogen tank and the fuel cell, wherein the subframe supports the cooling device.

13. The work vehicle according to claim 11, comprising at least one pair of wheels arranged on both sides perpendicular to the longitudinal direction of the vehicle body and supported by the vehicle body, wherein the subframe supports the equipment above at least one of the wheels of the pair.

14. The work vehicle according to claim 13, comprising, as the at least pair of wheels, a pair of front wheels supported at the front of the vehicle body, and a pair of rear wheels positioned behind the pair of front wheels, wherein the subframe supports the equipment above at least one of the rear wheels of the pair of rear wheels.

15. The work vehicle according to claim 12, wherein the hydrogen tank is supported by the main frame, and the subframe supports the cooling device such that the upper end of the cooling device is located above the upper end of the hydrogen tank.

16. A work vehicle comprising: a vehicle body; a hydrogen tank; a fuel cell that generates electricity using hydrogen supplied from the hydrogen tank; a motor that rotates using electricity generated by the fuel cell; a cooling device for cooling at least one of the hydrogen tank and the fuel cell; a main frame provided on the vehicle body and supporting at least one of the hydrogen tank and the fuel cell; a subframe attached to the main frame and supporting the cooling device at a distance from the main frame; and electrical components disposed between the main frame and the subframe for controlling at least one of the hydrogen tank, the fuel cell, the motor, and the cooling device.

17. The work vehicle according to claim 16, wherein the main frame includes a first support portion for supporting the hydrogen tank and a second support portion aligned in the front-rear direction with respect to the first support portion for supporting the fuel cell, the upper end of the second support portion is configured to support the fuel cell above the position of support of the hydrogen tank by the first support portion, and the second support portion is configured to allow the electrical components to be positioned below the fuel cell.

18. The work vehicle according to claim 17, wherein the subframe is connected to the upper end of the second support and extends perpendicular to the second support in the vertical and vertical directions.

19. The work vehicle according to claim 17, wherein the first support portion is positioned in front of the second support portion in the front-rear direction, and the hydrogen tank is positioned in front of the electrical components.

20. The work vehicle according to claim 16, wherein the vehicle body includes a vehicle frame supporting a plurality of wheels, and a gear case positioned in front of or behind the vehicle frame, and the motor is positioned below the electrical components and transmits power to at least one of the wheels and the gear case.

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