Work vehicle

Abstract

To provide a work vehicle which enables efficient cooling of a fuel cell.SOLUTION: In a work vehicle provided with an engine hood and a radiator device, devices disposed under the engine hood are cooled by the radiator device which is disposed outside the engine hood.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a work vehicle equipped with a tank for storing fuel gas. [Background technology]

[0002] In recent years, in order to achieve decarbonization, progress has been made in the development of work vehicles that run on gases such as hydrogen as fuel. The work vehicle (tractor) disclosed in Patent Document 1 is equipped with a tank for storing gas and a fuel cell that generates electricity using the gas, and runs on the electrical energy output from the fuel cell. In this type of work vehicle, in order to maintain a stable output even during work, it is necessary to increase the size of the fuel cell. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2023-013186 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in this type of work vehicle, if the fuel cell is increased in size, the cooling performance of the fuel cell must also be increased accordingly.

[0005] The present invention has been made in consideration of the above problems, and has an object to provide a work vehicle that can efficiently cool a fuel cell. [Means for solving the problem]

[0006] The present invention employs the following technical means to achieve the above object.

[0007] A work vehicle according to one aspect of the present invention is a work vehicle equipped with a bonnet and a radiator device, in which equipment arranged on the bonnet is cooled by the radiator device arranged outside the bonnet. [Effects of the Invention]

[0008] According to the above-described work vehicle, the fuel cell can be cooled by a relatively large radiator device disposed outside the hood, so that the fuel cell can be cooled efficiently. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 2 is a left side view of the work vehicle of the present invention. [Figure 2] FIG. 2 is a right side view of the work vehicle of the present invention. [Figure 3] 1 is a top view of a work vehicle according to the present invention; [Figure 4] 1 is a front view of a work vehicle according to the present invention; [Figure 5] FIG. 2 is a rear view of the work vehicle of the present invention. [Figure 6] 1 is a front perspective view of a work vehicle according to the present invention. [Figure 7] 1 is a partially exploded front perspective view of a work vehicle according to the present invention. [Figure 8] FIG. 2 is a partially exploded rear perspective view of the work vehicle of the present invention. [Figure 9] FIG. [Figure 10] 1 is a block diagram showing a basic configuration of a work vehicle according to the present invention; [Figure 11] FIG. 4 is a top view of the tank stay and the second radiator device. [Figure 12] FIG. 4 is a rear view of the periphery of the second radiator device. [Figure 13] FIG. 2 is a bottom perspective view of the tank stay and the tank cover. [Figure 14] FIG. 4 is a schematic cross-sectional view of the periphery of a second radiator device. [Figure 15]FIG. 2 is a bottom perspective view of the cover support frame and the tank case. [Figure 16] FIG. 2 is a rear perspective view of the tank stay, the tank cover, and the cover support frame. [Figure 17] FIG. 10 is a top perspective view with the inspection window open. [Figure 18] 1 is a left side view showing a schematic configuration of a work vehicle according to the present invention. [Figure 19] 1 is a front view showing a schematic configuration of a work vehicle according to the present invention. [Figure 20] FIG. 10 is a left side view of a work vehicle showing a first modified example. [Figure 21] FIG. 1 is a top view of a work vehicle showing a first modified example. [Figure 22] FIG. 10 is a left side view of the work vehicle showing a second modified example. [Figure 23] FIG. 10 is a top view of a work vehicle showing a second modified example. DETAILED DESCRIPTION OF THE INVENTION

[0010] An embodiment of the present invention will be described with reference to the drawings. FIGS. 1 to 8 show a work vehicle 1 according to one embodiment of the present invention. The work vehicle 1 of this embodiment is a tractor, and is used by connecting implements such as cultivators and balers that are suited to the purpose and application of agricultural work. The work vehicle 1 of this embodiment is a type of FCV (Fuel Cell Vehicle) that is powered by electricity generated by a fuel cell. Note that the work vehicle 1 according to the present invention is not limited to a tractor. For example, the work vehicle 1 according to the present invention may be an agricultural machine, construction machine, utility vehicle, etc. other than a tractor.

[0011] In the following description, the length direction of the vehicle body 2 (the direction indicated by arrows X1 and X2 in Figures 1 to 3), which is the straight-ahead traveling direction of the work vehicle 1, will be referred to as the front-to-rear direction, the width direction of the vehicle body 2 (the direction indicated by arrows Y1 and Y2 in Figures 3 to 5) as the left-to-right direction, and the height direction of the vehicle body 2 (the direction indicated by arrows Z1 and Z2 in Figures 1, 2, 4, and 5) as the up-to-down direction.

[0012] As shown in FIGS. 1 and 2, the work vehicle 1 includes a vehicle body 2, a traveling device 3, a drive unit 4, a coupling device 5, a driver's seat 6, a cabin (protective device) 7, and a hood 8. The work vehicle 1 includes a radiator unit 9, a tank 10, a tank stay 11, a tank cover (cover) 12, an air conditioning condenser 13, an oil cooler 14, and an auxiliary battery 15. As shown in FIG. 2, the drive unit 4 includes a drive motor 16, a fuel cell stack (fuel cell) 17, and a battery unit 18. The radiator unit 9 includes a first radiator unit 9A and a second radiator unit 9B. As shown in FIGS. 1 and 2, the work vehicle 1 includes a gas filler port (receptacle) 19, side mirrors 20, and a front mirror 21.

[0013] The vehicle body 2 is formed by combining metal frame materials and the like. The vehicle body 2 includes a front frame 2A and a drive transmission device 2B. The vehicle body 2 has a stay mounting portion 2C. A tank stay 11 is connected to and supported by the stay mounting portion 2C. The tank 10 is supported on the vehicle body 2 via the tank stay 11. In addition to the tank 10, devices such as a second radiator device 9B and a reserve tank 22 are mounted on the upper part of the tank stay 11. A tank cover 12 covers these devices arranged on the upper part of the tank stay 11. The tank stay 11 supports the tank 10, the tank cover 12, and the second radiator device 9B (radiator frame 45).

[0014] The front frame 2A is a structure that extends in the front-to-rear direction. The drivetrain 2B is connected to the rear of the front frame 2A. That is, the rear of the vehicle body 2 is made up of the drivetrain 2B. The auxiliary battery 15, first radiator device 9A, air conditioning condenser 13, oil cooler 14, and fuel cell stack 17 are arranged in this order from front to rear on top of the front frame 2A.

[0015] The drive transmission device 2B is equipped with a clutch device, a transmission device, a differential device, etc., and reduces or increases the speed of the power of the drive motor 16 and outputs it to the traveling device 3. As shown in FIGS. 5 and 8, the drive transmission device 2B has a PTO shaft (power take-off shaft) 23. The drive motor 16 outputs power to the PTO shaft 23 via the drive transmission device 2B. In other words, the drive transmission device 2B is configured to be able to output the power of the drive motor 16 not only to the traveling device 3, but also to the PTO shaft 23.

[0016] When a working device is connected to the connecting device 5 for use, the PTO shaft 23 is connected to the driven shaft of the working device via a universal joint. This allows the working device to be driven by the power of the drive motor 16. The drive transmission device 2B is connected to a hydraulic pump, and outputs the power of the drive motor 16 to the hydraulic pump as well. The hydraulic cylinders provided on the traveling device 3 and the connecting device 5 are driven by the hydraulic oil (pressurized oil) discharged from the hydraulic pump.

[0017] 9, the stay mounting portion 2C includes a front stay mounting portion 24F, a central stay mounting portion 24C, and a rear stay mounting portion 24R. The front stay mounting portion 24F, the central stay mounting portion 24C, and the rear stay mounting portion 24R are provided on the left and right sides of the vehicle body 2, respectively. In this way, the tank stay 11 is connected and supported by the stay mounting portions 2C provided at three locations on each of the left and right sides of the vehicle body 2.

[0018] The front stay mounting portion 24F is provided at the front of the vehicle body 2. The front stay mounting portion 24F is provided on the front side surface of the front frame 2A. The front stay mounting portion 24F is located forward of the front wheel 3F. The central stay mounting portion 24C is provided at the middle portion of the vehicle body 2 in the fore-and-aft direction. The central stay mounting portion 24C is provided on the rear side surface of the front frame 2A. The central stay mounting portion 24C is located rearward of the front wheel 3F. The rear stay mounting portion 24R is provided at the rear of the vehicle body 2. The rear stay mounting portion 24R is provided on the axle case of the rear wheel 3R (traveling device 3) of the drive transmission device 2B.

[0019] The traveling devices 3 support the vehicle body 2 so that it can travel. As shown in Figs. 1 to 8, the traveling devices 3 are wheels rotatably connected to the left and right sides of the vehicle body 2, and include a pair of left and right front wheels 3F and a pair of left and right rear wheels 3R. The front wheels 3F are disposed below the front frame 2A. The rear wheels 3R ​​are disposed below the drive transmission device 2B. Either or both of the front wheels 3F and the rear wheels 3R ​​may be crawlers.

[0020] The traveling device 3 is driven by power transmitted from the drive device 4 via the drive transmission device 2B. In this embodiment, the front wheels 3F and rear wheels 3R ​​of the traveling device 3 are each drive wheels that receive power from the drive device 4 and are driven. The front wheels 3F are steered wheels that are steered by a handle located in front of the driver's seat 6. In other words, the work vehicle 1 of this embodiment is a four-wheel drive vehicle in which the front wheels 3F are steered wheels and the front wheels 3F and rear wheels 3R ​​are drive wheels. The traveling device 3 has a hydraulic cylinder that steers the steered wheels. The work vehicle 1 may also be a two-wheel drive vehicle in which the front wheels 3F are steered wheels and only the rear wheels 3R ​​are drive wheels. The work vehicle 1 may also be a four-wheel steering vehicle in which both the front wheels 3F and the rear wheels 3R ​​are steered wheels.

[0021] The drive motor 16 is a prime mover that drives the traveling device 3. The drive motor 16 is connected to the drive transmission device 2B and outputs power to the traveling device 3 via the drive transmission device 2B. As shown in FIGS. 1 and 2 , the drive motor 16 is incorporated into the rear part of the front frame 2A. The drive motor 16 is housed in the rear part of the bonnet 8.

[0022] In this embodiment, one drive motor 16 is mounted on the vehicle body 2, and the power of the drive motor 16 is distributed and output to the front wheels 3F and rear wheels 3R ​​by the drive transmission device 2B. Note that two drive motors 16 may be mounted on the front and rear of the vehicle body 2, and the drive motors 16 may be configured to output the power of each drive motor 16 independently to the front wheels 3F and rear wheels 3R, respectively. Alternatively, a drive motor 16 may be provided independently for all four wheels, the left and right front wheels 3F and rear wheels 3R, and the drive motors 16 may be configured to output the power of each drive motor 16 to the corresponding front wheel 3F and rear wheel 3R, respectively.

[0023] The fuel cell stack 17 generates electricity using hydrogen gas supplied from the tank 10 and supplies the electricity to the drive motor 16. The fuel cell stack 17 is configured by arranging a plurality of unit cells, each having two types of electrodes (positive and negative), in a stacked state inside a casing, and by combining the electricity generated by each unit cell, it generates the voltage and current required to drive the drive motor 16.

[0024] The fuel cell stack 17 is disposed at the rear of the front frame 2A. That is, the fuel cell stack 17 is housed at the rear of the hood 8. As shown in FIG. 2, a drain hose L1 is connected to the fuel cell stack 17. The drain hose L1 discharges air and water generated inside the fuel cell stack 17 as a result of the power generation to the outside. The drain hose L1 extends to the outside from an opening below the hood 8.

[0025] 10, the fuel cell stack 17 is connected to the second radiator device 9B via a radiator hose L2. The radiator hose L2 is a pipe that connects the fuel cell stack 17 and the second radiator device 9B, and allows coolant to circulate between the fuel cell stack 17 and the second radiator device 9B.

[0026] The fuel cell stack 17 is connected to an inverter 25 via a boost circuit. The boost circuit boosts the voltage of the power generated by the fuel cell stack 17. The inverter 25 is connected to the drive motor 16, and converts the DC power input from the boost circuit into three-phase AC power and outputs it to the drive motor 16. In this way, the fuel cell stack 17 drives the drive motor 16 with the power boosted by the boost circuit. As shown in FIGS. 1 and 9, the inverter 25 is disposed on the left side of the vehicle body 2, between the front wheel 3F and the rear wheel 3R.

[0027] The fuel cell stack 17 is connected via a step-down circuit to low-voltage devices that operate at a lower voltage than the drive motor 16. The step-down circuit is a DC / DC converter 26. In this embodiment, the low-voltage devices include the radiator device 9, the battery unit 18, and the air-conditioning capacitor 13. The DC / DC converter 26 converts the voltage of the DC power input from the fuel cell stack 17 to a lower voltage and outputs it to each low-voltage device. In this way, the fuel cell stack 17 supplies the power stepped down by the DC / DC converter 26 to each low-voltage device. The DC / DC converter 26 is arranged alongside the inverter 25 on the left side of the vehicle body 2, between the front wheel 3F and the rear wheel 3R.

[0028] The battery unit 18 is a charge-discharge type secondary battery such as a lithium ion battery or a lead storage battery. The battery unit 18 stores the power supplied from the fuel cell stack 17 and outputs the stored power to the inverter 25 and the like as appropriate. As shown in FIGS. 2 and 9, the battery unit 18 is disposed on the right side of the vehicle body 2 between the front wheel 3F and the rear wheel 3R.

[0029] The air conditioning condenser 13 is a cooler that cools the coolant circulated between the air conditioning device installed inside the cabin 7. As shown in FIGS. 1, 2, and 9, the air conditioning condenser 13 is disposed behind the first radiator device 9A on the upper part of the front frame 2A. The air conditioning condenser 13 is disposed between the first radiator device 9A and the oil cooler 14. The air conditioning condenser 13 is housed in the middle of the hood 8 in the front-to-rear direction.

[0030] The oil cooler 14 is a cooler that cools the hydraulic oil supplied to the hydraulic motor, hydraulic pump, etc. The oil cooler 14 is disposed behind the air conditioning condenser 13 on the upper part of the front frame 2A. The oil cooler 14 is disposed between the air conditioning condenser 13 and the fuel cell stack 17. The oil cooler 14 is housed in the middle of the hood 8 in the front-to-rear direction.

[0031] The auxiliary battery 15 is a charge / discharge type secondary battery such as a lithium ion battery or a lead storage battery. The auxiliary battery 15 stores power supplied from the fuel cell stack 17 and outputs the stored power to the headlights 38, the first radiator device 9A (first fan 43), the second radiator device 9B (second fan 46), a display monitor provided inside the cabin 7, an operation device, etc. The auxiliary battery 15 is disposed in front of the front frame 2A. The auxiliary battery 15 is disposed adjacent to and in front of the first radiator device 9A. The auxiliary battery 15 is housed in the front part of the hood 8.

[0032] The coupling device 5 is a device that couples the working device to the vehicle body 2. The coupling device 5 is provided at the rear of the drive transmission device 2B. In this embodiment, the coupling device 5 is a three-point link mechanism that couples the working device and raises and lowers it. The coupling device 5 has a hydraulic cylinder that raises and lowers the working device.

[0033] As shown in Figures 1 and 2, the driver's seat 6, cabin 7, and hood 8 are each located at the top of the vehicle body 2. The driver's seat 6 is located above the drivetrain 2B. The cabin 7 is a protective device that protects the driver's seat 6, and is erected above the drivetrain 2B. Note that the work vehicle 1 may be provided with a canopy instead of the cabin 7 as a protective device for the driver's seat 6.

[0034] The cabin 7 is a box-shaped structure that surrounds the driver's seat 6 from the front, rear, left, right, and above, and includes pillars 7P, a roof 7T, a front panel 7F, a rear panel 7R, and side panels 7S. The pillars 7P are erected around the driver's seat 6 in the drivetrain 2B. The pillars 7P include a left front pillar 31, a right front pillar 32, a left side pillar 33, and a right side pillar 34. The left front pillar 31 is erected to the left front of the driver's seat 6. The right front pillar 32 is erected to the right front of the driver's seat 6. The left side pillar 33 is erected to the left rear of the driver's seat 6. The right side pillar 34 is erected to the right rear of the driver's seat 6. The roof 7T is supported by the upper ends of these four pillars 7P.

[0035] As shown in FIG. 6, the front panel 7F is disposed in front of the driver's seat 6 and constitutes the front portion of the cabin 7. The front panel 7F has a windshield 35. The windshield 35 is formed of a transparent material such as glass, and ensures visibility ahead of the vehicle from the driver's seat 6. As shown in FIGS. 1 and 2, the front mirror 21 is provided in front of the windshield 35. The detailed arrangement and configuration of the front mirror 21 will be described later.

[0036] The rear panel 7R is disposed behind the driver's seat 6 and constitutes the rear portion of the cabin 7. As shown in Figures 5 and 8, the rear panel 7R has a rear window 36. The rear window 36 is made of a transparent material such as glass, and ensures visibility behind the vehicle from the driver's seat 6.

[0037] As shown in FIGS. 1 and 2, the side panels 7S are disposed on the left and right sides of the driver's seat 6, respectively, and form the left and right side portions of the cabin 7. The side panels 7S have side windows 37. The side windows 37 are formed of a transparent material such as glass, and ensure visibility to the sides of the vehicle from the driver's seat 6. The side mirrors 20 are provided outward of the side windows 37. The detailed arrangement of the side mirrors 20 will be described later.

[0038] In this embodiment, both the left and right side panels 7S are connected by hinges to the side pillars 33, 34 on the same side, and serve as boarding doors for the driver to enter and exit the driver's seat 6. Note that only one of the left and right side panels 7S may serve as a boarding door.

[0039] The hood 8 is a cover that covers the equipment mounted on the upper part of the front frame 2A. The hood 8 is connected to the front frame 2A in front of the cabin 7. The hood 8 covers the above-mentioned equipment, namely, the first radiator unit 9A, the air conditioning condenser 13, the oil cooler 14, the auxiliary battery 15, the drive motor 16, and the fuel cell stack 17.

[0040] The fuel cell stack 17 occupies a relatively large space inside the hood 8. A plurality of devices other than the fuel cell stack 17 are also housed inside the hood 8. For this reason, the hood 8 is formed in a relatively large box shape. Furthermore, the front end of the hood 8 and the front end of the front frame 2A are located forward of the front wheels 3F. In other words, the hood 8 extends forward from the front of the cabin 7 to a position forward of the front wheels 3F, partially blocking the view ahead of the vehicle from the driver's seat 6. Therefore, in this embodiment, the work vehicle 1 is provided with a front mirror 21 in front of the cabin 7, which enables as wide a view as possible of the area around the hood 8 from the driver's seat 6.

[0041] 1, 2, 4, and 6, the hood 8 has a front surface 8F, side surfaces 8S, and a top surface 8T. The side surfaces 8S and top surface 8T each extend rearward from the front surface 8F. The top surface 8T is formed into a curved surface that is convex upward and generally arc-shaped, and is gently inclined from the rear toward the front and downward.

[0042] As shown in Figures 1 and 2, the hood 8 has headlights 38 and air vents 39. The headlights 38 are provided on the front surface 8F of the hood 8 and illuminate the area ahead of the work vehicle 1. The air vents 39 are provided on each of the left and right side surfaces 8S of the hood 8. The air vents 39 are provided on the side surfaces 8S of the hood 8 at positions laterally facing the fuel cell stack 17.

[0043] The ventilation opening 39 is made of a mesh member. The mesh member is a porous member with a plurality of through holes, which allows air to circulate between the inside and outside of the hood 8 and also protects the equipment inside the hood 8 from mud, stones, agricultural debris, etc.

[0044] 10, the radiator device 9 constitutes a liquid-cooling system that uses a coolant (refrigerant) to cool devices such as the drive motor 16, fuel cell stack 17, inverter 25, and DC / DC converter 26. The first radiator device 9A is connected to the drive motor 16, inverter 25, and DC / DC converter 26 among the above devices via a first coolant flow path H1, and cools the coolant circulating through the first coolant flow path H1 by heat exchange with external air. This keeps the drive motor 16, inverter 25, and DC / DC converter 26 at or below a predetermined temperature.

[0045] 1, 2, and 9, the first radiator device 9A is provided upright on the upper part of the front frame 2A behind the auxiliary battery 15. The first radiator device 9A is disposed between the auxiliary battery 15 and the oil cooler 14. The first radiator device 9A is housed in the middle of the hood 8 in the front-rear direction.

[0046] 9, the first radiator device 9A has a first heat exchanger (heat exchanger) 41, a radiator frame 42, and a first fan (fan) 43. In this embodiment, the first radiator device 9A has one first fan 43. However, the first radiator device 9A may have two or more first fans 43.

[0047] The first heat exchanger 41 is an air-liquid heat exchanger configured with a plurality of heat transfer fins and heat transfer pipes. The first coolant flow path H1 is connected to the first heat exchanger 41. The radiator frame 42 is a frame that surrounds the outer periphery of the first heat exchanger 41 and is connected to the upper part of the front frame 2A. That is, the radiator frame 42 supports the first heat exchanger 41 on the upper part of the front frame 2A.

[0048] The first fan 43 circulates air through the first heat exchanger 41, promoting heat exchange between the air and the coolant flowing through the first heat exchanger 41. The first fan 43 is disposed at the rear of the first heat exchanger 41. The first fan 43 is disposed between the first heat exchanger 41 and the air conditioning condenser 13.

[0049] In this embodiment, when the first fan 43 is driven, it causes air to flow from the front to the rear of the first heat exchanger 41. As a result, air outside the hood 8 is taken into the interior of the hood 8 through the front grille, a lower opening, or the like. The air taken into the interior of the hood 8 passes through the area where the auxiliary battery 15 is located, the first heat exchanger 41, the air conditioning condenser 13, and the oil cooler 14, in that order, and then passes through the area where the fuel cell stack 17 is located, before being discharged to the outside through the vent 39 on the side surface 8S of the hood 8. As a result, the coolant flowing through the first heat exchanger 41 is efficiently cooled. The air that has passed through the first heat exchanger 41 and the like also promotes cooling of the fuel cell stack 17.

[0050] As shown in Fig. 10, the second radiator device 9B is connected to the fuel cell stack 17 through a second coolant flow path H2, and cools the coolant circulating through the second coolant flow path H2 by heat exchange with the external air. This keeps the internal electrodes of the fuel cell stack 17 at a predetermined temperature or lower. As a result, the fuel cell stack 17 maintains high power generation efficiency.

[0051] As shown in Figures 1 and 2, the second radiator device 9B is disposed on the upper part of the tank stay 11. In this embodiment, the second radiator device 9B is supported by the tank stay 11 at a position where an upper end of the second radiator device 9B is higher than the tank 10. The second radiator device 9B is disposed in front of the tank 10 on the upper part of the tank stay 11. As shown in Figures 1, 2 and 11, the second radiator device 9B is housed in the front part of the tank cover 12.

[0052] As described above, the work vehicle 1 of this embodiment is equipped with a relatively large fuel cell stack 17. Therefore, the second radiator device 9B that cools the fuel cell stack 17 must also be large and have high cooling performance. However, because multiple devices other than the fuel cell stack 17 must be accommodated inside the hood 8, there is a problem in that it is difficult to ensure sufficient space for the second radiator device 9B. Furthermore, if the second radiator device 9B is placed close together with other devices inside the hood 8, external air may not flow smoothly to the second radiator device 9B, which may impair cooling efficiency. Therefore, in this embodiment, the second radiator device 9B is placed outside the hood 8 (more specifically, in the space S1 inside the tank cover 12 in front of the tank 10 as shown in FIG. 11 ), and the fuel cell stack 17 placed inside the hood 8 is cooled by the second radiator device 9B.

[0053] 11 to 13, the second radiator device 9B has a second heat exchanger (heat exchanger) 44, a radiator frame 45, and a second fan (fan) 46. In this embodiment, the second radiator device 9B has two second fans 46. Note that the second radiator device 9B may have only one second fan 46, or may have three or more second fans 46.

[0054] The second heat exchanger 44 is an air-liquid heat exchanger configured with a plurality of heat transfer fins and heat transfer pipes. The second coolant flow path H2 is connected to the second heat exchanger 44. The radiator frame 45 is a frame that surrounds the outer periphery of the second heat exchanger 44 and is connected to the front upper part of the tank stay 11. That is, the radiator frame 45 supports the second heat exchanger 44 at the front upper part of the tank stay 11.

[0055] The second fans 46 circulate air through the second heat exchange section 44, promoting heat exchange between the air and the coolant flowing through the second heat exchange section 44. The second fans 46 are arranged side by side on the left and right at the rear of the second heat exchange section 44. The second fans 46 are arranged between the second heat exchange section 44 and the tank 10.

[0056] In this embodiment, the second fan 46, when driven, causes air to flow from the front to the rear of the second heat exchanger 44 (see FIG. 14). As a result, air outside the tank cover 12 is taken into the tank cover 12 through an opening in the front of the tank cover 12 (a first opening 55 described later). Furthermore, the air taken into the tank cover 12 passes through the second heat exchanger 44, and is then discharged to the outside through an opening in the side of the tank cover 12 (a second opening 59 described later) or an opening in the bottom of the tank cover 12 (a third opening 63 described later). As a result, the coolant flowing through the second heat exchanger 44 is efficiently cooled. Furthermore, the air that has passed through the second heat exchanger 44 also promotes cooling of the tank 10.

[0057] Tank 10 stores hydrogen gas. Tank 10 is a high-pressure container made of a hard synthetic resin reinforced with carbon fiber or glass fiber, and is filled with and stores hydrogen gas from a gas supply device such as a hydrogen gas station. As shown in FIG. 10 , tank 10 is connected to gas fill port 19 via a first gas flow path, and hydrogen gas is filled from gas fill port 19 through the first gas flow path. Tank 10 is connected to fuel cell stack 17 via a second gas flow path, and hydrogen gas is delivered to fuel cell stack 17 through the second gas flow path.

[0058] As shown in Figures 11 and 15, in this embodiment, the tank 10 is formed in a generally cylindrical shape that is long in the front-to-rear direction. As shown in Figures 5, 10, 11, and 15, the tank 10 has a valve device V1. The valve device V1 is equipped with an on-off valve, a pressure reducing valve, etc., and adjusts the hydrogen gas in the tank 10 to a predetermined flow rate before discharging it to the fuel cell stack 17. In this embodiment, the valve device V1 is provided on the mirror portion on the rear end side of the tank 10. That is, the tank 10 is positioned with the valve device V1 facing toward the rear of the work vehicle 1.

[0059] As shown in Figures 1 and 2, one or more tanks 10 are supported on the upper part of the tank stay 11. As shown in Figures 5, 6, and 11, in this embodiment, three tanks 10 are arranged adjacent to each other horizontally on the upper part of the tank stay 11. As shown in Figure 15, each of these tanks 10 is housed inside a common tank case (casing) 50. The tanks 10 housed in the tank case 50 constitute a single tank unit. The number of tanks 10 is not limited to three. For example, the work vehicle 1 may be equipped with only one tank 10, two tanks 10, or four or more tanks 10. In this embodiment, the tank case 50 is formed from steel of a material and thickness that can thermally and physically protect the tanks 10 from the outside.

[0060] As shown in Figures 5 and 6, the tank case 50 is supported on the upper part of the tank stay 11. As shown in Figure 14, the tank case 50 is a box-like body large enough to accommodate multiple tanks 10, and is formed in a generally rectangular shape that is open downward and long in the front-to-rear direction. The tank case 50 has a front surface 50F, a rear surface 50R, side surfaces 50S, a top surface 50T, and a lower frame 50U. The lower frame 50U is a plate that is long in the left-to-right direction and is installed between the lower ends of the left and right side surfaces 50S. The tanks 10 are attached to the upper part of the lower frame 50U.

[0061] The tank stay 11 is a support frame that supports the tank 10. As shown in Figs. 7 and 13, the tank stay 11 supports the tank cover 12 and the second radiator device 9B (radiator frame 45) in addition to the tank 10. As shown in Figs. 1 and 2, the tank stay 11 is supported on the upper part of the vehicle body 2. The tank stay 11 has both the function of stably supporting the tank 10 relative to the vehicle body 2 and the function of absorbing vibrations of the vehicle body 2 during travel and operation to reduce impacts on the tank 10.

[0062] 13 and 16, the tank stay 11 has a base frame 51, a plurality of support legs 52, a radiator mounting portion 53, and a cover support frame 54. As shown in FIGS. 7 and 8, the tank cover 12 is connected to and supported by the tank stay 11 via the cover support frame 54.

[0063] As shown in Fig. 8, the base frame 51 is formed in a rectangular ring shape. The base frame 51 is disposed above the roof 7T. The tank case 50 is connected to the base frame 51. That is, the tank case 50 is supported by the tank stay 11 above the roof 7T. The tank cover 12 covers the tank case 50 (and the tank unit including the tank 10). Details of the tank cover 12 will be described later.

[0064] As shown in Figures 13 and 16, the base frame 51 has a front frame portion 51F, a rear frame portion 51R, and a side frame portion 51S. The front frame portion 51F extends in the left-right direction forward of the front end of the roof 7T. The rear frame portion 51R extends in the left-right direction rearward of the rear end of the roof 7T. A rear frame 51E is provided at the rear lower portion of the rear frame portion 51R. The rear frame 51E has vertical frames extending downward from the left and right ends of the rear frame portion 51R and horizontal frames connecting the lower ends of the vertical frames. A gas filler port 19 is provided on the left side of the rear frame 51E.

[0065] The side frame portions 51S extend in the front-to-rear direction above the left and right side edges of the roof 7T. That is, the two side frame portions 51S are arranged side by side with a gap between them above the roof 7T. The side frame portions 51S connect the left and right ends of the front frame portion 51F and the rear frame portion 51R to each other. The tank case 50 is attached to the left and right side frame portions 51S.

[0066] The support legs 52 are provided on the lower part of the base frame 51 and are connected to the stay mounting portion 2C of the vehicle body 2. The support legs 52 include a front support leg 52F, a central support leg 52C, and a rear support leg 52R. The front support leg 52F, the central support leg 52C, and the rear support leg 52R are provided on both the left and right sides of the base frame 51, respectively. In other words, the front support leg 52F, the central support leg 52C, and the rear support leg 52R are each provided in pairs at the lower part of the base frame 51, spaced apart on the left and right. Thus, in this embodiment, the tank stay 11 has six support legs 52.

[0067] The front support legs 52F are provided at the front of the base frame 51. The front support legs 52F are arranged on the left and right sides of the hood 8, with the hood 8 in between. In other words, the front support legs 52F are erected forward of the front panel 7F (front window 35). The front support legs 52F extend diagonally forward and downward from the left and right ends of the front frame portion 51F of the base frame 51, pass along the sides of the hood 8, and are connected to the front stay mounting portions 2CF of the vehicle body 2.

[0068] The central support legs 52C are provided on the front lower part of the base frame 51. The central support legs 52C are arranged on the left and right sides of the hood 8, with the hood 8 in between. In other words, the central support legs 52C are erected forward of the front panel 7F (front window 35). The central support legs 52C extend downward from the front ends of the side frame portions 51S of the base frame 51, pass along the sides of the hood 8, and are connected to the central stay mounting portion 24C of the vehicle body 2. As shown in FIG. 13 , the radiator hose L2 extends along the front peripheral surface of the central support legs 52C. This ensures that the forward visibility from the driver's seat 6 is not obstructed.

[0069] 7 and 13, the radiator hose L2 has an outgoing pipe L2A and a return pipe L2B. The outgoing pipe L2A guides the coolant from the second radiator device 9B to the fuel cell stack 17. The return pipe L2B guides the coolant from the fuel cell stack 17 to the second radiator device 9B. In this embodiment, the outgoing pipe L2A extends along the left central support leg 52C. On the other hand, the return pipe L2B extends along the right central support leg 52C.

[0070] As shown in Figures 8, 13, and 16, the rear support legs 52R are provided on the rear lower part of the base frame 51. The rear support legs 52R are provided on the lower end of the rear frame 51E. The rear support legs 52R are provided side by side at a distance on the left and right behind the cabin 7. In other words, the rear support legs 52R are provided upright in front of the rear panel 7R (rear window 36). The rear support legs 52R extend downward from the lower end of the rear frame 51E, pass behind the cabin 7, and are connected to the rear stay mounting portion 2CR of the vehicle body 2.

[0071] As shown in Figures 13 and 16, the radiator mounting portion 53 has side stays 53S and lower stays 53U. The side stays 53S are arranged at a distance in the left-right direction in front of the base frame 51. The side stays 53S extend obliquely upward and forward from the connection portion (the upper end portion of the front support leg 52F) between the front frame portion 51F of the base frame 51 and the front support leg 52F. The base end portion of the side stay 53S is connected to the upper end portion of the front support leg 52F, and the tip end portion of the side stay 53S is connected to the side surface portion of the radiator frame 45 forward of the front frame portion 51F.

[0072] The lower stays 53U are provided on the upper ends of the left and right front support legs 52F, respectively. The lower stays 53U are connected to the upper ends of the front support legs 52F at positions lower than the connecting portions of the radiator mounting portions 53. The lower stays 53U extend obliquely upward and forward from the upper ends of the front support legs 52F. The base ends of the lower stays 53U are connected to the upper ends of the front support legs 52F, and the tip ends of the lower stays 53U are connected to the underside of the radiator frame 45 forward of the front frame portion 51F. As a result, the second heat exchanger 44 is connected and supported by the side stays 53S and the lower stays 53U forward of the front frame portion 51F of the base frame 51. In other words, the second heat exchanger 44 is disposed forward of the front end of the roof 7T.

[0073] The cover support frame 54 is disposed on top of the base frame 51. The cover support frame 54 is disposed along the inner surface of the tank cover 12 and serves as a base member that reinforces the tank cover 12. As shown in Figures 15 and 16, the cover support frame 54 has an arch 54A, a cross beam 54B, and a reserve tank mounting portion 54C.

[0074] Two arches 54A are arranged side by side at a distance from each other on the upper part of the base frame 51. The arches 54A are frames curved in a generally U-shape that protrudes upward, and extend from the top surface 50T of the tank case 50 to the left and right side surface portions 50S. Both ends of the arches 54A are connected and fixed to the left and right side frame portions 51S of the base frame 51.

[0075] A plurality of cross beams 54B extend in the front-rear direction between the two arches 54A. In this embodiment, the cross beams 54B are connected to the top and left and right side portions of the arch 54A. That is, the cross beams 54B extend in the front-rear direction along the top surface 50T and left and right side surfaces 50S of the tank case 50. In this embodiment, the cross beams 54B at the top of the arch 54A are arranged in pairs on the left and right with a gap between them. The cross beams 54B at the sides of the arch 54A are arranged in pairs on the top and bottom with a gap between them.

[0076] 16, the reserve tank mounting portion 54C is a frame that is long in the front-rear direction and is provided on the right side of the front arch 54A. The reserve tank 22 is connected to and supported by the reserve tank mounting portion 54C inside the tank cover 12.

[0077] The tank cover 12 is a cover that covers equipment such as the tank 10 supported on the upper part of the tank stay 11. As shown in Figures 13 and 16, the tank cover 12 is a substantially rectangular box that is long in the front-to-rear direction, and extends above the roof 7T from behind the rear end of the roof 7T to forward of the front end of the roof 7T. In other words, the tank cover 12 is disposed on the upper part of the tank stay 11 with the front part of the tank cover 12 protruding forward of the front end of the roof 7T.

[0078] In this way, the tank cover 12 is provided so that the front portion of the tank cover 12 overlaps the rear portion of the hood 8 when viewed from above (see FIG. 3). As a result, the second radiator device 9B is disposed at a position that overlaps with the fuel cell stack 17 when viewed from above. In this embodiment, the second radiator device 9B is disposed above the fuel cell stack 17.

[0079] The tank cover 12 has a front cover 12F, a rear cover 12R, a side cover 12S, an upper cover 12T, and a lower cover 12U. The front cover 12F forms the front surface of the tank cover 12. The rear cover 12R forms the rear surface of the tank cover 12. The side cover 12S forms the left and right side surfaces of the tank cover 12. The upper cover 12T forms the upper surface of the tank cover 12. The lower cover 12U forms the lower surface of the tank cover 12.

[0080] The front cover 12F is disposed in front of the tank case 50, with a space (ventilation chamber) S1, which serves as an air passage, left therebetween (see FIG. 14). That is, the front cover 12F is disposed in front of the tank 10. The second radiator device 9B and the reserve tank 22 are disposed in the ventilation chamber S1. The second heat exchanger 44 of the second radiator device 9B is disposed inside the tank cover 12, facing the front cover 12F.

[0081] The front cover 12F is a generally rectangular plate that is long in the left-right direction and is inclined downward and forward from the front end of the upper cover 12T. That is, the front cover 12F is formed as an inclined surface that tilts toward the tank 10. The front cover 12F forms an inclined surface portion at the front of the tank cover 12. That is, the inclined surface portion is disposed in front of the tank 10. In this embodiment, the front cover 12F is disposed at an angle of 60 degrees inclined downward and forward of the upper cover 12T, with the front end of the upper cover 12T as the base point.

[0082] The front cover 12F has a first opening 55. The ventilation chamber S1 is connected to the space outside the tank cover 12 through the first opening 55. The first opening 55 is made of a mesh member. The mesh member is a porous member with multiple through-holes that allows air to circulate between the inside and outside of the tank cover 12 and protects the equipment inside the tank cover 12 from mud, stones, agricultural debris, and the like. Note that the first opening 55 may be made of a grill-like perforated plate with multiple slits, as long as it can allow an appropriate amount of air to circulate through the ventilation chamber S1 and appropriately protect the equipment from debris and the like. Alternatively, the first opening 55 may be made of a mesh member formed by crisscrossing multiple metal wires vertically and horizontally, or may be made of a mesh member made of expanded metal.

[0083] As described above, the front cover 12F forms an inclined surface that tilts toward the tank 10, thereby ensuring a larger opening area for the first opening 55 compared to when the front cover 12F forms a vertical surface extending in the vertical direction.

[0084] The rear cover 12R is disposed behind the tank case 50. That is, the rear cover 12R is disposed behind the tank 10. The rear cover 12R has a top plate 56, left and right side plates 57, and a rear plate 58. The top plate 56 is removably connected to the rear end of the top cover 12T. The left and right side plates 57 are each removably connected to the rear end of the corresponding side cover 12S. The rear plate 58 is disposed facing the valve device V1 of the tank 10. In this way, the tank cover 12 is configured so that an operator can access the tank 10 and the valve device V1 during maintenance, etc., by removing the rear cover 12R.

[0085] The side covers 12S are disposed facing each other on the left and right sides of the tank case 50. The side covers 12S are generally trapezoidal plate bodies that are long in the front-to-rear direction and extend downward from the left and right side edges of the top cover 12T.

[0086] The side cover 12S has a second opening 59. The ventilation chamber S1 is connected to the space outside the tank cover 12 through the second opening 59. In this embodiment, the second opening 59 is provided in both the left and right side covers 12S (the left and right sides of the tank cover 12). Note that the second opening 59 may be provided in only one of the left and right side covers 12S (the left and right sides of the tank cover 12).

[0087] The second opening 59 is made of a mesh member. The mesh member is similar to that of the first opening 55, and therefore a description thereof will be omitted. Like the first opening 55, the second opening 59 may be made of a grill-like perforated plate, a mesh member made of a plurality of metal wires, or a mesh member made of expanded metal.

[0088] The top cover 12T is disposed above and facing the tank case 50. The top cover 12T is a generally rectangular plate that is long in the front-to-rear direction and covers the entire top surface 50T of the tank case 50 from above. The top cover 12T has an inspection window 60 and a window cover 61. The inspection window 60 is provided in the front right portion of the top cover 12T. The inspection window 60 is connected to the ventilation chamber S1. As shown in FIG. 16, the radiator cap 44C provided in the second heat exchanger 44 and the reserve tank 22 are disposed facing the inspection window 60 in the ventilation chamber S1.

[0089] The window cover 61 covers the inspection window 60 from the outside of the upper cover 12T. In this embodiment, the window cover 61 is detachably fixed to the upper cover 12T with a fixing screw. In this manner, the tank cover 12 is configured so that an operator can access the radiator cap 44C and the reserve tank 22 during maintenance, etc., by removing the window cover 61. The inspection window 60 serves as a window that allows coolant to be replenished into the reserve tank 22.

[0090] The radiator cap 44C has both the function of closing the coolant supply port provided in the second heat exchanger 44 and the function of adjusting the internal pressure of the second coolant flow path H2. The reserve tank 22 is a container that stores the coolant. The reserve tank 22 is connected to and supported by a reserve tank mounting portion 54C of the cover support frame 54.

[0091] 13, the lower cover 12U has a front lower cover 62, a third opening 63, a fourth opening 64, and a rear lower cover 65. The front lower cover 62 and the third opening 63 are disposed below the ventilation chamber S1.

[0092] The front lower cover 62 is disposed behind the lower end of the front cover 12F. The front lower cover 62 extends rearward from the lower end of the front cover 12F and further extends diagonally rearward and downward from the middle. That is, the front lower cover 62 is formed in a generally V-shape with an obtuse angle when viewed from the side.

[0093] The third opening 63 is disposed behind the rear end of the front lower cover 62. The third opening 63 extends obliquely rearward and upward from the rear end of the front lower cover 62. In other words, the third opening 63 is inclined downward from the center side in the front-rear direction of the tank cover 12 toward the front. As described above, the tank cover 12 has a lower inclined surface portion in the lower part (lower cover 12U) of the tank cover 12 that transitions downward from the center side in the front-rear direction toward the first opening 55. The third opening 63 is provided in the lower inclined surface portion. In this embodiment, the third opening 63 is disposed at an angle of 18 degrees rearward and upward from the rear end of the front lower cover 62 as a base point.

[0094] The third opening 63 is supported by having its front end fixed to the rear end of the front lower cover 62 with a fixing member such as a bolt, and its rear end fixed to the front frame portion 51F of the base frame 51 with a fixing member such as a bolt. In other words, the third opening 63 is connected and fixed to the front lower cover 62 and the front frame portion 51F of the base frame 51.

[0095] The third opening 63 is made of a mesh member. The mesh member is similar to that of the first opening 55, and therefore a description thereof will be omitted. Like the first opening 55, the third opening 63 may be made of a grill-like perforated plate, a mesh member made of a plurality of metal wires, or a mesh member made of expanded metal.

[0096] The fourth opening 64 is arranged next to and behind the third opening 63. The fourth opening 64 is arranged opposite the opening at the bottom of the tank case 50, and allows air to circulate between the inside and outside of the tank case 50. The fourth opening 64 is arranged below the tank 10 housed inside the tank case 50. The fourth opening 64 is fixed to a flange portion 70 provided at the upper end of the central support leg 52C with fixing members such as bolts.

[0097] The fourth opening 64 is made of a mesh member. The mesh member is similar to that of the first opening 55, and therefore a description thereof will be omitted. Like the first opening 55, the fourth opening 64 may be made of a grill-like perforated plate, a mesh member made of a plurality of metal wires, or a mesh member made of expanded metal.

[0098] The third opening 63 is disposed forward of the front surface 50F of the tank case 50. That is, the third opening 63 is disposed forward of the tank 10 (below the ventilation chamber S1). The third opening 63 is provided in a position that protrudes forward of the front end of the roof 7T at the bottom of the tank cover 12. Therefore, air discharged from the third opening 63 flows downward from the upper front of the cabin 7. That is, a portion of the air that has passed through the second heat exchanger 44 and has exchanged heat is discharged from the third opening 63 and the fourth opening 64 toward the windshield 35 and the front mirror 21 of the front panel 7F. This makes it difficult for water droplets, dust, and the like to adhere to the surfaces of the windshield 35 and the front mirror 21.

[0099] The rear lower cover 65 is disposed in front of the lower end of the rear plate 58 of the rear cover 12R. The rear lower cover 65 extends forward from the lower end of the rear plate 58 of the rear cover 12R and is disposed below and opposite the upper plate 56 of the rear cover 12R.

[0100] As shown in FIGS. 3 to 5, the side mirrors 20 are disposed on the left and right sides of the cabin 7. The side mirrors 20 are provided at positions that allow visibility from the driver's seat 6 through the side windows 37. The side mirrors 20 include a left side mirror (first side mirror) 20L provided on the left side of the vehicle body 2, and a right side mirror (second side mirror) 20R provided on the right side of the vehicle body 2. The side mirrors 20 are connected and supported by the left front pillar 31 and the right front pillar 32 of the cabin 7, respectively, with their mirror surfaces facing rearward.

[0101] As shown in FIGS. 3, 18, and 19, the front mirror 21 is disposed forward of the cabin 7. The front mirror 21 is disposed forward of the left side mirror 20L and the right side mirror 20R. The front mirror 21 is disposed in a position that allows visibility from the driver's seat 6 through the windshield 35. The front mirror 21 is a curved mirror having a substantially rectangular shape, and is connected to and supported by the right central support leg 52C of the tank stay 11 with its longitudinal direction facing the front-to-rear direction and its mirror surface facing diagonally downward and left. This allows the operator OP to view the area in front of the hood 8 and the left and right sides (around the front wheels 3F) at a wide angle from the driver's seat 6 while driving or working, as shown by the arrows in FIGS. 18 and 19. In other words, the front mirror 21 allows visibility of the area in front of the hood 8 from the driver's seat 6.

[0102] 1, 2, 4, and 18, the front mirror 21 is disposed below the tank cover 12. That is, when viewed from above, the front mirror 21 is entirely covered by the tank cover 12. Therefore, even when driving or working in the rain, rainwater is less likely to adhere to the front mirror 21. As shown in FIG. 13, in this embodiment, the front mirror 21 is disposed below the third opening 63.

[0103] 4 and 19, the front mirror 21 is disposed between the left side mirror 20L and the right side mirror 20R when viewed from the front. The front mirror 21 is disposed higher than the left side mirror 20L and the right side mirror 20R when viewed from the front. This allows the driver OP to view the area around the hood 8 from the driver's seat 6 in a bird's-eye view, as shown by the arrows in FIGS. 18 and 19.

[0104] <Modification> In the above embodiment, the tank stay 11 has six support legs 52, but the number of support legs 52 is not limited to six as long as the tank 10 can be stably supported. For example, the tank stay 11 may be configured to support the tank 10 with four support legs 52 (front support legs 52F and rear support legs 52R, or center support legs 52C and rear support legs 52R), or may be configured to support the tank 10 with three or fewer support legs 52, or may be configured to support the tank 10 with seven or more support legs 52. Alternatively, the tank stay 11 may not have support legs 52, and the base frame 51 may be connected to the upper part of the roof 7T, that is, the tank 10 may be supported by the cabin 7.

[0105] In the work vehicle 1 (first modified example) shown in Figures 20 and 21, the tank stay 11 has a center support leg 52C and a rear support leg 52R that are arranged on either side of the hood 8, with the tank 10 supported by these four support legs 52. In this case, extension frames 52E are provided in place of the front support legs 52F at the front of the base frame 51. The extension frames 52E extend diagonally forward and downward from the left and right ends of the front frame portion 51F of the base frame 51. The lower stays 53U are provided at the extended ends (tips) of the left and right extension frames 52E, respectively.

[0106] Alternatively, as in a work vehicle 1 (second modified example) shown in Figures 22 and 23, the tank stay 11 may be configured to support the tank 10 with four support legs 52 and two reinforcing legs 52G. Specifically, the tank stay 11 has two reinforcing legs 52G in addition to a central support leg 52C and a rear support leg 52R (four support legs 52) that are arranged on the left and right sides of the hood 8, with the hood 8 sandwiched between them. The reinforcing legs 52G are provided at the front part of the central support leg 52C. The reinforcing legs 52G are arranged on the left and right sides of the hood 8, with the hood 8 sandwiched between them. The reinforcing legs 52G extend diagonally forward and downward from a position closer to the lower end than the center between the top and bottom of the central support leg 52C, and are connected to the front stay mounting portion 2CF of the vehicle body 2 by passing along the side of the hood 8. This allows the tank stay 11 to exhibit high rigidity in the fore-and-aft direction.

[0107] In the above embodiment, the tank cover 12 has an inclined surface portion at the front (front cover 12F), and the inclined surface portion is provided with the first opening 55, but the tank cover 12 may be configured to be supported in the reversed front-to-rear direction relative to the tank stay 11. That is, the tank cover 12 may have an inclined surface portion at the rear (rear plate 58 of the rear cover 12R), and the inclined surface portion may be provided with the first opening 55.

[0108] In the above embodiment, the front mirror 21 is provided on the central support leg 52C of the tank stay 11, but as long as the area around the hood 8 can be seen from the driver's seat 6, it may be provided on the front support leg 52F of the tank stay 11, or on a member other than the tank stay 11, such as the cabin 7 (pillar 7P, front panel 7F, roof 7T, etc.) or the tank cover 12 (front cover 12F, side cover 12S, lower cover 12U, etc.).

[0109] The present invention provides a work vehicle 1 described in the following items.

[0110] (Item A1) A work vehicle (1) comprising a tank (10) for storing gas and a cover (12) for covering the tank (10), the cover (12) including an inclined surface portion (12F) at least at one of the front and rear portions, and the inclined surface portion (12F) having a first opening (55).

[0111] According to the work vehicle 1 relating to item A1, a wide opening area of ​​the first opening 55 can be ensured, which allows air to circulate smoothly around the tank 10. This makes it possible to effectively prevent the temperature of the tank 10 from rising too high.

[0112] (Item A2) The work vehicle 1 according to item A1, wherein the inclined surface portion 12F is formed as an inclined surface that inclines toward the tank 10 side.

[0113] According to the work vehicle 1 relating to item A2, it is possible to allow air to circulate more smoothly between the first opening 55 and the area around the tank 10, and therefore the temperature rise in the tank 10 can be more effectively prevented.

[0114] (Item A3) The work vehicle (1) according to item A1 or A2, wherein the inclined surface portion (12F) is disposed in front of the tank (10).

[0115] According to the work vehicle 1 according to item A3, it is possible to allow air to circulate smoothly around the tank 10, particularly when traveling forward, and therefore the temperature of the tank 10 can be more effectively prevented from rising.

[0116] (Item A4) A work vehicle 1 described in any one of items A1 to A3, comprising equipment mounted on a vehicle body 2 and a radiator device 9B that cools the equipment, the radiator device 9B being arranged inside the cover 12.

[0117] According to the work vehicle 1 relating to item A4, air can be smoothly circulated to the tank 10 and the radiator device 9B arranged inside the cover 12, thereby making it possible to improve the cooling efficiency of the equipment mounted on the vehicle body 2 while preventing the tank 10 from becoming too hot.

[0118] (Item A5) The work vehicle 1 according to any one of items A1 to A4, wherein the first opening 55 is configured by a mesh member.

[0119] If mud, crop debris, etc. adheres to the tank 10 or surrounding equipment, there is a risk that air will not efficiently come into contact with the surfaces of the equipment. However, the work vehicle 1 according to item A5 can prevent mud, crop debris, etc. from adhering to the equipment, allowing air to more appropriately come into contact with the equipment. This effectively prevents the equipment, including the tank 10, from becoming too hot.

[0120] (Item A6) The work vehicle 1 according to any one of items A1 to A5, wherein a second opening 59 is formed in at least one of the left side and the right side of the cover 12.

[0121] According to the work vehicle 1 relating to item A6, it is possible to circulate air around the tank 10 more efficiently, and therefore the temperature of the tank 10 can be more effectively prevented from rising.

[0122] (Item A7) The work vehicle 1 according to item A6, wherein the second opening 59 is configured by a mesh member.

[0123] The work vehicle 1 according to item A7 can prevent mud, crop debris, and the like from adhering to the equipment, allowing the equipment to be more appropriately exposed to air, thereby further improving the cooling efficiency of the equipment.

[0124] (Item A8) The work vehicle 1 according to any one of items A1 to A7, wherein a third opening 63 is formed in a lower portion of the cover 12.

[0125] According to the work vehicle 1 relating to item A8, air can be circulated around the tank 10 more efficiently, and therefore the temperature of the tank 10 can be more effectively prevented from rising.

[0126] (Item A9) The work vehicle 1 described in item A8, wherein the cover 12 includes a downward inclined surface portion that transitions downward from the center of the cover 12 in the fore-and-aft direction toward the first opening 55, and the third opening 63 is provided in the downward inclined surface portion.

[0127] According to the work vehicle 1 relating to item A9, air can be smoothly circulated between the first opening 55 and the third opening 63, and therefore the temperature rise in the tank 10 can be more effectively prevented.

[0128] (Item A10) The work vehicle 1 according to item A8 or A9, wherein the third opening 63 is configured by a mesh member.

[0129] The work vehicle 1 according to item A10 can prevent mud, crop debris, and the like from adhering to the equipment, allowing the equipment to be more appropriately exposed to air, thereby effectively preventing the temperature of the equipment, including the tank 10, from rising too high.

[0130] (Item B1) The work vehicle (1) is equipped with a tank (10) for storing gas, a fuel cell (17) mounted on a vehicle body (2), a radiator device (9B) for cooling the fuel cell (17), and a cover (12) for covering the tank (10) and the radiator device (9B).

[0131] According to the work vehicle 1 according to item B1, the cover 12 can effectively protect the tank 10 and the radiator device 9B from the sun's radiant heat, ultraviolet rays, collisions with obstacles, and the like.

[0132] (Item B2) The work vehicle 1 according to item B1, comprising a casing 50 that houses the tank 10, and the cover 12 covering the casing 50.

[0133] According to the work vehicle 1 of item B2, the tank 10 is doubly covered with the casing 50 and the cover 12, which makes it possible to more effectively protect the tank 10. Also, in this structure, the casing 50 separates the storage section of the tank 10 from the storage section of the radiator device 9B, which allows air to circulate smoothly through the radiator device 9B. This also improves the cooling efficiency of the fuel cell 17.

[0134] (Item B3) The work vehicle 1 according to item B1 or B2, further comprising a hood 8 that covers the fuel cell 17, and the cover 12 is provided in a position that overlaps with the hood 8 when viewed from above.

[0135] According to the work vehicle 1 according to item B3, even if an object or a fallen tree falls from above the vehicle, the hood 8 and cover 12 can effectively protect the fuel cell 17.

[0136] (Item B4) The work vehicle 1 described in any one of items B1 to B3, wherein the radiator device 9B has a heat exchanger 44, a radiator frame 45 that supports the heat exchanger 44, and a fan 46, and the heat exchanger 44, the radiator frame 45, and the fan 46 are arranged inside the cover 12.

[0137] According to the work vehicle 1 relating to item B4, the fan 46 can forcibly circulate air between the inside and outside of the cover 12, which makes it possible to more reliably circulate air around the tank 10. This effectively prevents the tank 10 from becoming too hot.

[0138] (Item B5) The work vehicle (1) according to item B4, comprising a tank stay (11) that supports the tank (10), the cover (12), and the radiator frame (45).

[0139] According to the work vehicle 1 relating to item B5, even if an obstacle collides with the cover 12, the impact is absorbed and dispersed by the tank stay 11, the cover 12, and the radiator frame 45, making it possible to protect the tank 10 more effectively.

[0140] (Item B6) The work vehicle 1 is described in any one of items B1 to B5, wherein the radiator device 9B has an upper end portion located above the tank 10.

[0141] According to the work vehicle 1 according to item B6, even if an object or tree falls from above the vehicle, the tank 10 can be more effectively protected by the cover 12 and the radiator device 9B. Also, with this structure, the air circulating between the inside and outside of the cover 12 can be smoothly guided to the radiator device 9B without being obstructed by the tank 10. This further improves the cooling efficiency of the fuel cell 17.

[0142] (Item B7) The work vehicle 1 according to any one of items B1 to B6, wherein the radiator device 9B is disposed at an incline so as to tilt toward the tank 10 side.

[0143] According to the work vehicle 1 relating to item B7, even if an obstacle collides with the cover 12, the impact is dispersed by the inclination of the radiator device 9B, making it possible to protect the tank 10 more effectively.

[0144] (Item B8) The work vehicle 1 is described in any one of items B1 to B7, and is provided with a reserve tank 22 that stores the coolant to be circulated through the radiator device 9B, the reserve tank 22 being arranged inside the cover 12, and the cover 12 having a window portion 60 that allows the coolant to be replenished into the reserve tank 22.

[0145] According to the work vehicle 1 according to item B8, the cover 12 can effectively protect the reserve tank 22 from radiant heat from the sun, ultraviolet rays, collisions with obstacles, etc. Also, with this structure, the reserve tank 22 can be cooled by air circulating between the inside and outside of the cover 12, further improving the cooling efficiency of the fuel cell 17.

[0146] (Item C1) A work vehicle (1) equipped with a bonnet (8) and a radiator device (9B), in which equipment arranged on the bonnet (8) is cooled by the radiator device (9B) arranged outside the bonnet (8).

[0147] According to the work vehicle 1 according to this item C1, it is possible to increase the size of the radiator device 9B by disposing the radiator device 9B outside the hood 8. This improves the cooling efficiency of the devices disposed under the hood 8.

[0148] (Item C2) The work vehicle (1) according to item (C1) includes a tank (10) for storing gas, and the radiator device (9B) is disposed in front of or behind the tank (10).

[0149] According to the work vehicle 1 according to item C2, it is possible to efficiently guide air to the radiator device 9B, particularly while the vehicle is traveling. This further improves the cooling efficiency of the devices arranged under the hood 8. In addition, the air flowing through the radiator device 9B can effectively prevent the temperature of the tank 10 from rising too high.

[0150] (Item C3) The work vehicle (1) according to item (C2), wherein the equipment includes a fuel cell (17) that generates electricity using the gas, and the radiator device (9B) is disposed above the fuel cell (17).

[0151] According to the work vehicle 1 according to item C3, even if the radiator device 9B is provided at a location away from the hood 8, it is possible to shorten the length of the piping connecting the radiator device 9B and the fuel cell 17. This reduces heat loss in the piping, improving the cooling efficiency of the fuel cell 17.

[0152] (Item C4) The work vehicle 1 according to item C3, wherein the radiator device 9B is disposed at a position overlapping with the fuel cell 17 when viewed from above.

[0153] According to the work vehicle 1 according to item C4, the length of the piping connecting the radiator device 9B and the fuel cell 17 can be shortened compared to when the radiator device 9B is provided at a position that does not overlap with the fuel cell 17 when viewed from above. This reduces heat loss in the piping, further improving the cooling efficiency of the fuel cell 17.

[0154] (Item C5) The work vehicle 1 according to any one of items C2 to C4 includes a tank stay 11 that supports the radiator device 9B and the tank 10.

[0155] According to the work vehicle 1 relating to item C5, the radiator device 9B and the tank 10 are both supported by the tank stay 11 outside the hood 8, so even if an obstacle collides with the hood 8, the impact is unlikely to be transmitted to the radiator device 9B and the tank 10. This makes it possible to effectively protect the radiator device 9B and the tank 10.

[0156] (Item C6) The work vehicle 1 described in item C5, wherein the radiator device 9B has a heat exchanger 44, a radiator frame 45 that supports the heat exchanger 44, and a fan 46, and the fan 46 is disposed between the heat exchanger 44 and the tank 10.

[0157] According to the work vehicle 1 relating to item C6, the fan 46 can forcibly circulate air around the heat exchanger 44 and the tank 10, further improving the cooling efficiency of the equipment arranged in the hood 8. In addition, the air circulating through the radiator device 9B can more effectively prevent the temperature of the tank 10 from rising too high.

[0158] (Item C7) The work vehicle 1 according to any one of items C3 to C6 includes a radiator hose L2 that connects the radiator device 9B and the fuel cell 17.

[0159] According to the work vehicle 1 of item C7, the radiator device 9B and the fuel cell 17 can be connected vertically by the radiator hose L2, so the length of the radiator hose L2 connecting the radiator device 9B and the fuel cell 17 can be shortened compared to when the radiator device 9B is provided in a position that is off-top of the fuel cell 17 (a position where the radiator device 9B does not overlap the fuel cell 17 when viewed from above). This reduces heat loss in the radiator hose L2, further improving the cooling efficiency of the fuel cell 17.

[0160] (Item C8) The work vehicle 1 described in item C7 includes a tank stay 11 that supports the tank 10 and a driver's seat 6 that is arranged behind the hood 8, the tank stay 11 having a support leg 52 that is arranged on the side of the hood 8, and the radiator hose L2 is arranged in a position that overlaps the front of the support leg 52.

[0161] According to the work vehicle 1 according to item C8, the support legs 52 of the tank stay 11 can protect the radiator hose L2 from collision with obstacles, etc. Also, the radiator hose L2 can be prevented from obstructing the view from the driver's seat 6.

[0162] (Item D1) A work vehicle 1 includes a vehicle body 2, a first side mirror 20L provided on the left side of the vehicle body 2, a second side mirror 20R provided on the right side of the vehicle body 2, and a front mirror 21 disposed between the first side mirror 20L and the second side mirror 20R.

[0163] According to the work vehicle 1 relating to item D1, when driving or working, the first side mirror 20L, the second side mirror 20R, and the front mirror 21 allow a wide range of visibility around the vehicle body 2, making it easy to use.

[0164] (Item D2) The work vehicle 1 according to item D1, wherein the front mirror 21 is disposed further forward than the first side mirror 20L and the second side mirror 20R.

[0165] According to the work vehicle 1 according to item D2, the front mirror 21 allows the surroundings of the vehicle body 2 to be viewed from further forward than the first side mirror 20L and the second side mirror 20R, thereby providing better usability.

[0166] (Item D3) The work vehicle 1 according to item D1 or D2, wherein the front mirror 21 is disposed higher than the first side mirror 20L and the second side mirror 20R.

[0167] According to the work vehicle 1 according to item D3, the front mirror 21 allows the surroundings of the vehicle body 2 to be viewed from a position higher than the first side mirror 20L and the second side mirror 20R, thereby providing better usability.

[0168] (Item D4) A work vehicle 1 described in any one of items D1 to D3, comprising a driver's seat 6 and a hood 8 arranged in front of the driver's seat 6, and the front mirror 21 is configured to enable visibility around the hood 8.

[0169] According to the work vehicle 1 relating to item D4, the area around the hood 8 can be seen from the driver's seat 6 using the front mirror 21, and therefore good usability can be achieved.

[0170] (Item D5) The work vehicle 1 according to item D4, further comprising a fuel cell 17, the fuel cell 17 being disposed inside the hood 8.

[0171] If the fuel cell 17 were placed inside the hood 8, the hood 8 would become larger and would partially obstruct the view ahead of the vehicle from the driver's seat 6. However, with the work vehicle 1 according to item D5, the area around the hood 8 can be seen using the front mirror 21, so even if the fuel cell 17 is placed inside the hood 8, good usability is achieved.

[0172] (Item D6) The work vehicle 1 according to item D4 or D5, wherein the front mirror 21 is configured to enable visibility in front of the hood 8.

[0173] According to the work vehicle 1 relating to item D6, the front mirror 21 allows the driver to see ahead of the hood 8, making it even easier to use.

[0174] (Item D7) The work vehicle 1 described in item D6 includes a tank 10 for storing gas and a cover 12 for covering the tank 10, the cover 12 being disposed above the hood 8, and the front mirror 21 being disposed in front of the driver's seat 6 and between the hood 8 and the cover 12 when viewed from the front.

[0175] According to the work vehicle 1 according to item D7, the front mirror 21 is disposed between the cover 12 and the hood 8, so that rainwater, dust, etc. are less likely to adhere to the front mirror 21. This makes it possible to maintain good visibility around the vehicle body 2.

[0176] (Item D8) A work vehicle 1 described in any one of items D1 to D7, which is provided with a cabin 7 surrounding the driver's seat 6, and the front mirror 21 is attached to a member separate from the cabin 7 and positioned in front of the cabin 7.

[0177] According to the work vehicle 1 according to item D8, the surroundings of the vehicle body 2 can be seen from the front of the cabin 7, and therefore better usability can be achieved.

[0178] Although the present invention has been described above, the embodiments disclosed herein should be considered to be illustrative and not restrictive in all respects. The scope of the present invention is defined by the claims, not by the above description, and is intended to include all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0179] 1 Work vehicle 2. Body 3 Running gear 4. Drive unit 5 Coupling device 6 Driver's seat 7 Cabin (protective equipment) 8. Bonnet 9 Radiator unit 9A First radiator unit 9B Second radiator device 10 Tank 11 Tank stay 12 Tank cover 16 Drive motor 17 Fuel Cell Stack 18 Battery Unit 20 Side mirror 20L Left side mirror (first side mirror) 20R Right side mirror (second side mirror) 21 Front mirror 22 Reserve tank 50 Tank Case 55 First Opening 59 Second Opening 63 Third Opening L1 Drain hose L2 radiator hose S1 Ventilation chamber

Claims

1. In a work vehicle equipped with a bonnet and a radiator device, A work vehicle in which equipment arranged under the hood is cooled by the radiator device arranged outside the hood.

2. Equipped with a tank for storing gas, 2. The work vehicle according to claim 1, wherein the radiator device is disposed in front of or behind the tank.

3. the device includes a fuel cell that generates electricity using the gas; The work vehicle according to claim 2 , wherein the radiator device is disposed above the fuel cell.

4. The work vehicle according to claim 3 , wherein the radiator device is disposed in a position overlapping with the fuel cell when viewed from above.

5. 3. The work vehicle according to claim 2, further comprising a tank stay for supporting the radiator device and the tank.

6. the radiator device includes a heat exchange unit, a radiator frame that supports the heat exchange unit, and a fan, The work vehicle according to claim 5 , wherein the fan is disposed between the heat exchanger and the tank.

7. 4. The work vehicle according to claim 3, further comprising a radiator hose connecting the radiator device and the fuel cell.

Images