Work vehicle

Abstract

This work vehicle is provided with: a fuel cell; at least one fuel tank accommodating fuel supplied to the fuel cell; the motor is connected with the fuel cell; a vehicle body that rotatably supports the front wheel and the rear wheel; and a fuel filling port connected to the fuel tank by a pipe. The fuel filling port is provided at a position higher than the axle of the front wheels.

Description

Technical Field

[0001] The present disclosure relates to a work vehicle having an electric motor and a fuel cell. Background Art

[0002] In the automotive field, which is mainly aimed at moving "people" or "objects", electric vehicles (EVs) that use electric motors (hereinafter referred to as "motors") instead of internal combustion engines to generate driving force (traction) for traveling are becoming popular.

[0003] On the other hand, in order to achieve a decarbonized society, it is also required to reduce the amount of carbon dioxide (CO2) emitted by work vehicles such as tractors used in fields. Unlike general cars, work vehicles such as tractors need to tow work machines called work tools to perform agricultural operations such as tilling. Therefore, in order to achieve the electrification of work vehicles, there are issues that need to be solved that are different from the electrification of passenger cars.

[0004] Patent Document 1 discloses a tractor having a fuel cell (Fuel Cell: FC) power generation system and a motor without significantly changing the structure of a conventional engine-driven tractor.

[0005] Prior art literature

[0006] Patent Literature

[0007] Patent Document 1: Japanese Patent Application Publication No. 2002-225577 Summary of the invention

[0008] Problem that the invention aims to solve

[0009] In order to realize the power generation system of a work vehicle using a fuel cell, not only a fuel tank for storing fuel is required, but also various components are required. However, a work vehicle is different from a general car, for example, it has a mechanical structure for towing, lifting, and rotating a work tool. Therefore, there is a problem that a work vehicle cannot directly adopt the structure of a fuel cell power generation system in a conventional electric vehicle.

[0010] The present disclosure provides a work vehicle that can solve such problems.

[0011] Means used to solve problems

[0012] In an exemplary, non-limiting embodiment, a work vehicle of the present disclosure has: a fuel cell;

[0013] at least one fuel tank for containing fuel supplied to the fuel cell; a motor connected to the fuel cell; a vehicle body supporting the fuel cell, the fuel tank and the motor, and supporting the front and rear wheels to be rotatable; and a fuel filling port connected to the fuel tank by a pipe. The fuel filling port is provided at a position higher than the axle of the front wheel.

[0014] In an exemplary non-limiting embodiment, the working vehicle of the present disclosure includes: a fuel cell; at least one fuel tank containing fuel supplied to the fuel cell; a motor connected to the fuel cell; a vehicle body supporting the fuel cell, the fuel tank, and the motor, and supporting the front and rear wheels to be rotatable; and a fuel filling port connected to the fuel tank by a pipe. The fuel filling port has a receiver inclined so as to be higher inside than an inlet.

[0015] Effects of the Invention

[0016] According to an embodiment of the present disclosure, foreign matter such as muddy water or soil can be prevented from adhering to the fuel filling port, thereby improving the cleanliness of the fuel filling port and the surrounding area. According to another embodiment of the present disclosure, even if foreign matter such as water intrudes into the interior of the receiver from the fuel filling port, it is easily discharged to the outside, and the foreign matter can be prevented from intruding deep into the interior of the piping. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a plan view schematically showing a basic configuration example of a work vehicle according to the present disclosure.

[0018] Figure 2 This is a diagram showing a basic configuration example of a fuel cell power generation system mounted on a work vehicle.

[0019] Figure 3 This is a block diagram schematically showing an example of electrical connection and power transmission between components of the work vehicle of the present disclosure.

[0020] Figure 4 It is a block diagram schematically showing the path of an electric signal (thin solid line) and the path of a coolant (dashed line) between components in the work vehicle of the present disclosure.

[0021] Figure 5 It is a side view schematically showing a configuration example of a work vehicle in an embodiment of the present disclosure.

[0022] Fig. 6A It is a side view schematically showing an example of the arrangement relationship of main parts in the work vehicle in the embodiment of the present disclosure.

[0023] Figure 6BIt is a plan view schematically showing an example of the arrangement relationship of main parts in the work vehicle in the embodiment of the present disclosure.

[0024] Figure 7 It is a diagram schematically showing a mechanism for supporting a fuel tank in an embodiment of the present disclosure.

[0025] Figure 8 It is a diagram schematically showing a configuration example of a fuel tank module in an embodiment of the present disclosure.

[0026] Fig. 9 It is a diagram schematically showing the arrangement of the fuel gas sensor in the front housing and the tank box in the embodiment of the present disclosure.

[0027] Fig.10 It is a side view schematically showing an arrangement example of the heat sink device in the embodiment of the present disclosure.

[0028] Fig.11 It is a plan view schematically showing an arrangement example of a heat sink device in an embodiment of the present disclosure.

[0029] Fig.12 It is a side view schematically showing an example of arrangement of a fuel filling port in an embodiment of the present disclosure.

[0030] Fig.13 It is a side view schematically showing an example of the orientation of the fuel filling port in the embodiment of the present disclosure.

[0031] Fig.14 It is a perspective view of an agricultural tractor in an embodiment of the present disclosure (hereinafter referred to as the present embodiment).

[0032] Fig.15 is a side view of the agricultural tractor in this embodiment.

[0033] Fig.16 is a top view of the agricultural tractor in this embodiment.

[0034] Fig.17 It is a front view of the agricultural tractor in this embodiment.

[0035] Fig.18 is a rear view of the agricultural tractor in this embodiment.

[0036] Fig.19 It is a cross-sectional view schematically showing a structural example of the fuel filling port in this embodiment.

[0037] Fig. 20 It is a perspective view showing a structural example of the fuel filling port in this embodiment.

[0038] Fig.21It is a side view of an agricultural tractor showing an example of arrangement of a fuel filling port in the present embodiment.

[0039] Fig. 22 It is a top view of an agricultural tractor showing an example of arrangement of a fuel filling port in the present embodiment.

[0040] Fig.23 It is a cross-sectional view of the rear fender showing an example of arrangement of the fuel filling port in the present embodiment.

[0041] Fig.24A It is a cross-sectional view of the rear fender showing still another example of the arrangement of the fuel filling port in the present embodiment.

[0042] Fig. 24B It is a cross-sectional view of the rear fender showing still another example of the arrangement of the fuel filling port in the present embodiment.

[0043] Fig.25 It is a cross-sectional view of the steering column box showing still another example of the arrangement of the fuel filling port in the present embodiment.

[0044] Fig.26A It is a cross-sectional view of the fixed case portion showing still another example of the arrangement of the fuel filling port in the present embodiment.

[0045] Fig.26B It is a perspective view of the fixed case portion showing still another example of the arrangement of the fuel filling port in the present embodiment.

[0046] Fig.26C It is a side view of the fixed case portion showing still another example of the arrangement of the fuel filling port in the present embodiment.

[0047] Fig. 27 It is a cross-sectional view of the movable case portion showing still another example of the arrangement of the fuel filling port in the present embodiment. DETAILED DESCRIPTION

[0048] The following describes the embodiments of the present disclosure. However, sometimes more detailed descriptions than necessary are omitted. For example, detailed descriptions of matters that are already known and repeated descriptions related to substantially the same structure are sometimes omitted. This is to avoid the following description from becoming unnecessarily lengthy and to make it easy for those skilled in the art to understand. In addition, the inventor provides the drawings and the following description in order to enable those skilled in the art to fully understand the present disclosure, and does not intend to limit the subject matter described in the claims through them. In the following description, the same figure marks are marked on structural elements with the same or similar functions.

[0049] The following embodiments are for illustration only, and the technology disclosed in the present invention is not limited to the following embodiments. For example, the numerical values, shapes, materials, steps, the order of the steps, the layout of the display screen, etc. shown in the following embodiments are only examples, and various changes can be made as long as there is no technical contradiction. In addition, as long as there is no technical contradiction, one method can be combined with other methods.

[0050] The "work vehicle" in the present disclosure refers to a vehicle (vehicle) used to perform work at a work site. "Work site" refers to any place where work is performed, such as a farmland, forest, or construction site. "Field" refers to any place where agricultural work is performed, such as an orchard, dry field, paddy field, grain farm, or ranch. The work vehicle can be an agricultural machine such as a tractor, a rice transplanter, a combine harvester, a passenger management machine, or a passenger lawn mower, or a vehicle used for non-agricultural purposes such as a construction work vehicle or a snowplow. The work vehicle in the present disclosure can be equipped with a work tool (also called a "work machine" or "work device") corresponding to the work content at least one of its front and rear parts. Sometimes, driving a work vehicle while performing work is referred to as "work driving."

[0051] In addition, "agricultural machinery" refers to machinery used for agricultural purposes. Examples of agricultural machinery include tractors, harvesters, rice transplanters, passenger management machines, vegetable transplanters, mowers, seed drills, fertilizer spreaders, and agricultural mobile robots. There are cases where not only work vehicles such as tractors function as "agricultural machinery" alone, but also work tools installed on or towed by work vehicles and the work vehicles as a whole function as a "agricultural machinery". Agricultural machinery performs agricultural operations such as tilling the ground in the field, sowing, pest control, fertilizing, planting or harvesting crops.

[0052] 1. <Basic structure of work vehicle>

[0053] Before describing the embodiment of the work vehicle of the present disclosure in detail, the basic structure and operation examples of the work vehicle of the present disclosure are described. The work vehicle described below is equipped with a motor and a fuel cell power generation system (hereinafter referred to as "FC power generation system") for generating power required to drive the motor.

[0054] Figure 1 1 is a top view schematically showing an example of the basic structure of the work vehicle 100 of the present disclosure. In the present disclosure, the direction of travel when the work vehicle 100 is traveling straight forward is referred to as the "front direction", and the direction of travel when traveling straight backward is referred to as the "rear direction". In a plane parallel to the ground, the direction extending perpendicularly to the right relative to the "front direction" is referred to as the "right direction", and the direction extending perpendicularly to the left relative to the "front direction" is referred to as the "left direction". Figure 1In the figure, the "front direction", "rear direction", "right direction" and "left direction" are represented by arrows pointing to "front", "rear", "right" and "left", respectively. Sometimes the front direction and the rear direction are collectively referred to as the "front-rear direction", and the right direction and the left direction are collectively referred to as the "width direction".

[0055] The working vehicle 100 in the illustrated example is, for example, a tractor as an example of agricultural machinery. The technology disclosed in the present invention is not limited to working vehicles such as tractors, but can also be applied to other types of working vehicles. In addition, the working vehicle 100 can travel in the field while installing or towing a working tool and performing agricultural operations corresponding to the type of the working tool. In addition, the working vehicle 100 can also travel in the field and outside the field (including roads) in a state where the working tool is raised or in a state where the working tool is not installed.

[0056] Similar to conventional tractors, the work vehicle 100 has a vehicle body (vehicle frame) 102 that supports left and right front wheels 104F and left and right rear wheels 104R so as to be rotatable. The vehicle body 102 includes a front frame 102A provided with the front wheels 104F and a transmission box 102B provided with the rear wheels 104R. The front frame 102A is fixed to the front portion of the transmission box 102B. The front wheels 104F and the rear wheels 104R are sometimes collectively referred to as wheels 104. Strictly speaking, the wheels 104 are hubs with tires installed. In the present disclosure, "wheels" in principle refer to the whole of "hubs and tires". One or both of the front wheels 104F and the rear wheels 104R can be replaced by a plurality of wheels (tracks) with an infinite track installed, i.e., a wheel with a tire.

[0057] Figure 1 The work vehicle 100 in the example includes a fuel cell module (FC module) 10 and a motor 70 supported directly or indirectly by a front frame 102A. The FC module 10 includes a fuel cell stack (FC stack), which functions as an on-board generator that generates electricity from fuel as described later. Hereinafter, "FC module" or "FC stack" may be referred to simply as "fuel cell".

[0058] The motor 70 is electrically connected to the FC module 10. The motor 70 is capable of converting the electricity generated by the FC module 10 into mechanical motion (power), thereby generating the driving force (traction) required for the travel of the work vehicle 100. An example of the motor 70 is an AC synchronous motor. Since the FC stack of the FC module 10 generates a DC current, in the case where the motor 70 is an AC synchronous motor, a circuit group including an inverter device is provided between the FC stack and the motor 70 to convert the DC current into an AC current. A portion of this circuit group may be located inside the FC module 10. In addition, another portion of the circuit group may also be installed on the motor 70 as a drive circuit of the motor 70.

[0059] The motor 70 has a rotating output shaft 71. The torque of the output shaft 71 is transmitted to the rear wheel 104R via mechanical components such as a transmission (speed change device) and a rear wheel differential device (differential gear device) provided inside the transmission case 102B. In other words, the power generated by the motor 70 as a power source is transmitted to the rear wheel 104R through a power transmission system (power transmission system) 74 including a transmission provided in the transmission case 102B. Therefore, the "transmission case" can also be referred to as a "transmission box". In addition, in the four-wheel drive mode, part of the power of the motor 70 is also transmitted to the front wheel 104F. The power of the motor 70 can be used not only for the travel of the working vehicle 100, but also for driving the working tool. Specifically, a power output (PTO) shaft 76 is provided at the rear end of the transmission case 102B, and the torque of the output shaft 71 of the motor 70 is transmitted to the PTO shaft 76. The working tool installed on the working vehicle 100 or towed by the working vehicle 100 can receive power from the PTO shaft 76 and perform actions corresponding to various operations. The motor 70 and the power transmission system 74 may also be collectively referred to as an electric powertrain. An example of a speed change device in the transmission case 102B is disclosed in International Publication No. 2022 / 038860, and the entire contents thereof are hereby incorporated by reference.

[0060] Thus, in the work vehicle 100 of the present disclosure, an internal combustion engine such as a diesel engine is not mounted, but an FC module 10 and a motor 70 are mounted. In addition, the output shaft 71 of the motor 70 is mechanically coupled to a power transmission system 74 such as a transmission in the transmission case 102B. Compared with an internal combustion engine, the motor 70 can effectively generate torque within a relatively wide speed range. However, by utilizing the power transmission system 74 including the transmission, performing multi-stage or stepless speed change actions, it is easy to adjust the torque and speed from the motor 70 within a wider range. Therefore, not only can the driving of the work vehicle 100 be performed efficiently, but also a variety of operations using work tools can be performed efficiently.

[0061] In addition, some functions of the power transmission system 74 may be deleted according to the purpose or size of the work vehicle 100. For example, part or all of the transmission that performs the speed change function may be omitted. The number and mounting position of the motor 70 are also not limited to Figure 1 Example shown.

[0062] The work vehicle 100 has at least one fuel tank 50 for storing fuel to be supplied to the FC module 10. Figure 1In order to be concise, a fuel tank 50 is described. In some embodiments, a plurality of fuel tanks 50 are accommodated in a tank body to form a fuel tank module. As will be described later, the fuel tank 50 is supported by a member fixed to the vehicle body 102. The FC module 10 and the fuel tank 50 are connected by piping, on-off valves, etc. to form an in-vehicle FC power generation system. The structure and operation of the FC power generation system will be described later.

[0063] The work vehicle 100 in the embodiments described later has a driver's seat supported by the vehicle body 102. The driver's seat may be surrounded by a cab supported by the vehicle body 102. In the embodiments described later, the FC module 10 is disposed in front of the driver's seat, and the fuel tank 50 is disposed above the driver's seat. Such an FC module 10 and fuel tank 50 are accommodated in at least one "accommodating body". The "accommodating body" functions as a housing, for example, and has a function of protecting the FC module 10 and the fuel tank 50 from sunlight and wind and rain. In addition, such an accommodating body can also control the diffusion of fuel gas into the atmosphere in the case where fuel gas leaks from the FC module 10 or the fuel tank 50, making it easier to detect the fuel gas.

[0064] The FC module 10 can be accommodated in a front housing called an "engine hood", for example. The front housing is part of the "accommodating body". The front housing is supported by the front part (front frame 102A) of the vehicle body 102. As described above, the fuel tank 50 can be accommodated in a tank body. The tank body is supported directly or indirectly by the vehicle body 102.

[0065] 2. <FC Power Generation System>

[0066] Next, with reference to Figure 2 an example of the basic structure of the FC power generation system 180 mounted on the work vehicle 100 will be described.

[0067] Figure 2 The FC power generation system 180 shown functions as an in-vehicle power generation system in the Figure 1 work vehicle 100. The electric power generated by the power generation of the FC power generation system 180 is used not only for the running of the work vehicle 100 but also for the operation of work tools towed or mounted on the work vehicle 100.

[0068] The FC power generation system 180 in the illustrated example includes an FC module 10 and at least one fuel tank 50 that stores fuel supplied to the FC module 10. In addition, the FC power generation system 180 has a radiator device 34 for cooling the FC module 10.

[0069] The FC module 10 has a fuel cell stack (FC stack) 11, an air compressor 12, a fuel circulation pump 24, a coolant pump 31, a booster circuit 40, and a control device 42 as main components. These components are housed in a housing of the FC module 10 and are connected to each other by electrical or fluid communication.

[0070] The FC stack 11 generates electricity through an electrochemical reaction between "anode gas" as a fuel and "cathode gas" as an oxidizing gas. The FC stack 11 in this example is a solid polymer fuel cell. The FC stack 11 has a stacking structure in which a plurality of single cells are stacked. The single cell has an electrolyte membrane formed by, for example, an ion exchange membrane, an anode formed on one side of the electrolyte membrane, a cathode formed on the other side of the electrolyte membrane, and a pair of separators sandwiching the anode and the cathode from both sides. The voltage generated in the single cell is, for example, less than 1 volt. Therefore, in the FC stack 11, for example, more than 300 single cells are connected in series to generate a voltage of several hundred volts.

[0071] Anode gas is supplied to the anode of the FC stack 11. The anode gas is called "fuel gas" or simply "fuel". In the embodiment of the present disclosure, the anode gas (fuel) is hydrogen. Cathode gas is supplied to the cathode. The cathode gas is an oxidizing gas such as air. The anode is called the fuel electrode and the cathode is called the air electrode.

[0072] In the anode, an electrochemical reaction represented by the following formula (1) occurs.

[0073] 2H2→4H + +4e - …Formula (1)

[0074] In the cathode, an electrochemical reaction represented by the following formula (2) occurs.

[0075] 4H + +4e - +O2→2H2O…Formula (2)

[0076] As a whole, the reaction of the following formula (3) occurs.

[0077] 2H2+O2→2H2O…Formula (3)

[0078] The anode gas after the above reaction is called "anode exhaust gas", and the cathode gas after the above reaction is called "cathode exhaust gas".

[0079] The air compressor 12 supplies air sucked from the outside as cathode gas to the cathode of the FC stack 11. The cathode gas supply system including the air compressor 12 has a cathode gas supply pipe 13, a cathode exhaust pipe 14 and a bypass pipe 15. The cathode gas supply pipe 13 allows the cathode gas (air) supplied from the air compressor 12 to flow to the cathode of the FC stack 11. The cathode exhaust pipe 14 allows the cathode exhaust gas discharged from the FC stack 11 to flow to the outside air. The bypass pipe 15 branches from the cathode gas supply pipe 13 downstream of the air compressor 12, bypasses the FC stack 11 and is connected to the cathode exhaust pipe 14. A control valve 16 for adjusting the flow rate of the cathode gas flowing to the bypass pipe 15 is provided in the bypass pipe 15. A shut-off valve 17 for selectively shutting off the flow of the cathode gas to the FC stack 11 is provided in the cathode gas supply pipe 13. A pressure regulating valve 18 for adjusting the back pressure of the cathode gas is provided in the cathode exhaust pipe 14.

[0080] The cathode gas supply system of the FC module 10 includes a rotation speed sensor S1 for detecting the rotation speed of the air compressor 12 and a gas flow rate sensor S2 for detecting the flow rate of the cathode gas flowing in the cathode gas supply pipe 13. The control valve 16, the shutoff valve 17 and the pressure regulating valve 18 are, for example, solenoid valves.

[0081] The fuel circulation pump 24 supplies the fuel gas (anode gas) delivered from the fuel tank 50 to the anode of the FC stack 11. The anode gas supply system including the fuel circulation pump 24 has an anode gas supply pipe 21, an anode exhaust pipe 22 and a circulation flow path 23. The anode gas supply pipe 21 allows the anode gas supplied from the fuel tank 50 to flow to the anode of the FC stack 11. The fuel tank 50 in the embodiment of the present disclosure is a hydrogen tank that stores high-pressure hydrogen gas.

[0082] The anode exhaust gas pipe 22 is for the anode exhaust gas discharged from the FC stack 11 to flow. The anode exhaust gas is guided to the gas-liquid separation device 25 through the anode exhaust gas pipe 22 to remove moisture. The anode exhaust gas from which moisture has been removed is returned to the anode gas supply pipe 21 via the circulation flow path 23 using the fuel circulation pump 24. The anode exhaust gas circulating in the circulation flow path 23 can be discharged via the anode exhaust gas pipe 22 by opening the exhaust valve 26. The moisture stored in the gas-liquid separation device 25 can be discharged via the anode exhaust gas pipe 22 by opening the exhaust valve 26. The exhaust valve 26 is, for example, a solenoid valve. In the example of the figure, the anode exhaust gas pipe 22 is connected to the cathode exhaust gas pipe 14. By adopting such a structure, the anode exhaust gas containing unreacted anode gas that does not contribute to the electrochemical reaction is circulated and supplied to the FC stack 11 again, thereby improving the utilization efficiency of the anode gas.

[0083] In order to improve the performance of the FC stack 11, its temperature control is important. When electricity is generated by the reaction of hydrogen and oxygen to produce water, heat is also generated, so cooling is required. Figure 2, a coolant circulation system including a coolant pump 31 for the FC stack 11 is described, but as described later, a cooling circulation system for other electrical components may also be provided. In addition, the air compressor 12, the fuel circulation pump 24, and the coolant pump 31 of the FC module 10 are respectively operated by built-in motors. These motors are also electrical components.

[0084] Figure 2 The coolant circulation system including the coolant pump 31 has a coolant supply pipe 32, a coolant discharge pipe 33, a radiator device 34 and a temperature sensor S3. The coolant circulation system can adjust the temperature of the FC stack 11 to a predetermined range by circulating the coolant through the FC stack 11. The coolant is supplied to the FC stack 11 through the coolant supply pipe 32. The supplied coolant flows in the coolant flow path formed between the single cells and is discharged to the coolant discharge pipe 33. The coolant discharged to the coolant discharge pipe 33 flows to the radiator device 34. The radiator device 34 dissipates heat from the coolant by exchanging heat between the inflowing coolant and the outside air, and supplies the coolant whose temperature has been lowered to the coolant supply pipe 32 again.

[0085] The coolant pump 31 is provided in the coolant supply pipe 32 or the coolant discharge pipe 33 in such a manner as to deliver the coolant to the FC stack 11. A bypass flow path of the coolant may be provided between the coolant discharge pipe 33 and the coolant supply pipe 32. In this case, a diverter valve is provided at a branch point where the coolant bypass flow path branches from the coolant discharge pipe 33. The diverter valve can adjust the flow rate of the coolant flowing to the bypass flow path. The temperature sensor S3 detects the temperature of the coolant flowing in the coolant discharge pipe 33.

[0086] The coolant used to cool the FC stack 11 is circulated in the flow path by an electric pump (coolant pump) 31 for the coolant. A coolant control valve may be provided downstream of the FC stack 11. The coolant control valve adjusts the ratio of the coolant flowing to the radiator device 34 and the coolant bypassing the radiator device 34, so that the temperature of the coolant can be controlled with higher accuracy. Moreover, by controlling the water delivery amount of the coolant pump, the coolant temperature difference between the inlet and outlet of the FC stack 11 can also be controlled within a desired range. The temperature of the coolant in the FC stack 11 can be controlled to a temperature at which the power generation efficiency of the FC stack 11 is high, for example, about 70°C.

[0087] Preferably, the coolant flowing in the FC stack 11 has higher insulation than the coolant used to cool ordinary electrical components. A high voltage of, for example, more than 300 volts is generated in the FC stack 11, so by increasing the resistance of the coolant, it is possible to suppress current leakage through the coolant or the radiator device 34, etc. As the use of the coolant progresses, the resistance of the coolant sometimes decreases. This is because ions dissolve in the coolant flowing in the FC stack 11. In order to remove such ions from the coolant to improve insulation, it is preferred that an ion exchanger is arranged in the flow path of the coolant.

[0088] The boost circuit 40 can increase the voltage output from the FC stack 11 through power generation to a desired level. The back stage of the boost circuit 40 is connected to a circuit of a strong electric system including an inverter device for motor drive. In addition, as described later, the back stage of the boost circuit 40 can also be connected in parallel with a circuit of a weak electric system via a step-down circuit.

[0089] The control device 42 is an electronic control unit (ECU) that controls the power generation of the FC module 10. The control device 42 detects or estimates the operating state of the FC power generation system 180 based on signals output from various sensors. The control device 42 controls the operation of the air compressor 12, the fuel circulation pump 24, the coolant pump 31, and various valves based on the operating state of the FC power generation system 180 and instructions output from a higher-level computer or other ECUs, thereby controlling the power generation of the FC stack 11. The control device 42 includes, for example, a processor, a storage device, and an input / output interface.

[0090] In the following description, for simplicity, “anode gas” is referred to as “fuel gas” or “fuel”, and “anode gas supply pipe” is referred to as “pipe”.

[0091] 3.<System configuration example of work vehicle>

[0092] Next, refer to Figure 3 and Figure 4 , an example of the system configuration of the work vehicle 100 is described. Figure 3 This is a block diagram schematically showing an example of electrical connection and power transmission between components of the work vehicle 100 of the present disclosure. Figure 4 It means ratio Figure 3 A more detailed structural block diagram is shown in the structural example. Figure 4 Schematically shows the path of the electric signal (thin solid line) and the path of the coolant (dashed line) between the components in the work vehicle 100.

[0093] First, refer to Figure 3, an example of electrical connection and power transmission of components is described. Electrical connection includes both strong current system and weak current system. For example, the electrical connection of the strong current system provides the power supply voltage of the inverter device. For example, the electrical connection of the weak current system provides the power supply voltage of the electronic components operating at a relatively low voltage.

[0094] exist Figure 3 In the example shown, the work vehicle 100 has an FC module 10, an inverter device 72, a motor 70, a power transmission system 74 and a PTO shaft 76. The DC voltage of the power generated by the FC stack 11 of the FC module 10 is supplied to the inverter device 72 after being boosted by the boost circuit 40. The inverter device 72 converts the DC voltage into, for example, a three-phase AC voltage and supplies it to the motor 70. The inverter device 72 has a bridge circuit including a plurality of power transistors. The motor 70 includes a rotating rotor and a stator having a plurality of coils electrically connected to the inverter device 72. The rotor is connected to the output shaft 71, for example, via a reduction gear (reducer) or directly. The motor 70 rotates the output shaft 71 at a torque and a speed controlled according to the waveform of the three-phase AC voltage from the inverter device 72.

[0095] The torque of the output shaft 71 of the motor 70 is transmitted to the power transmission system 74. The power transmission system 74 operates with the motor 70 as a power source and can drive Figure 1 wheels 104R, 104F and / or PTO shaft 76. Such a power transmission system 74 may have the same structure or a similar structure as a power transmission system in a conventional tractor including an internal combustion engine such as a diesel engine. For example, by adopting a power transmission system used in an agricultural tractor, etc., it is possible to suppress the design cost and manufacturing cost of a working vehicle 100 for agricultural purposes equipped with an FC power generation system. The power transmission system 74 includes: a travel system power transmission mechanism that transmits power from the motor 70 to the left and right rear wheels 104R via a clutch, a transmission, and a rear wheel differential device; and a PTO system power transmission mechanism that transmits power from the motor 70 to the PTO shaft 76. Figure 1 The transmission case 102B can also be divided into a front case (transmission case) containing a clutch and a transmission, etc., and a rear case (differential gear case) containing a rear wheel differential device, etc. The rear case is also called a rear axle case.

[0096] The work vehicle 100 has a secondary battery (battery pack) 80 that temporarily stores the electric energy generated by the power generation of the FC module 10. Examples of the battery pack 80 include a lithium-ion battery pack. The battery pack 80 can supply electric power to the inverter device 72 when necessary in cooperation with the FC module 10 or independently. As the battery pack 80, various battery packs used in passenger electric vehicles can be adopted.

[0097] In addition to the motor 70 and the inverter device 72, the work vehicle 100 also has various electrical components (on-board electronic components) that are operated by electricity. Examples of electrical components include solenoid valves such as the on-off valve 20, the air-cooling fan of the radiator device 34, the electric pump of the refrigeration compressor 85, and a temperature control device for heating or cooling the FC stack 11. Such a temperature control device includes an electric heater 86. In addition, DC-DC converters 81, 82 and a battery 83 for obtaining a power supply voltage suitable for the operation of these electrical components may also be included in the electrical components. Moreover, various electronic components not shown in the figure (lights, electric motors for hydraulic systems, etc.) may also be included in the electrical components. These electrical components may be, for example, the same electronic components as those of conventional agricultural tractors.

[0098] exist Figure 3 In the example of FIG. 1 , the first DC-DC converter 81 is a circuit that reduces the voltage output from the boost circuit 40 of the FC module 10 to a first voltage, for example, 12 volts. The storage battery 83 is, for example, a lead storage battery, and can store electric energy using the voltage output from the first DC-DC converter 81. The storage battery 83 can be used as a power source for various electrical components such as a lamp, for example.

[0099] Figure 3 The work vehicle 100 shown has not only a first DC-DC converter 81 but also a second DC-DC converter 82 as a voltage conversion circuit for reducing the high voltage output by the FC module 10. The second DC-DC converter 82 is a circuit for reducing the voltage (e.g., several hundred volts) output from the boost circuit 40 of the FC module 10 to a second voltage higher than the first voltage, e.g., 24 volts. For example, the air cooling fan of the radiator device 34 can be operated using the voltage output from the second DC-DC converter 82. In addition, the radiator device 34 is Figure 3 Although described as a single component, one work vehicle 100 may include a plurality of radiator devices 34 . In addition, the electric pump of the cooling compressor 85 and the electric heater 86 can also be operated by the voltage output from the second DC-DC converter 82 .

[0100] Figure 3The work vehicle 100 shown has a temperature control device for cooling or heating the FC stack 11 included in the FC power generation system. The operation of such a temperature control device requires relatively large power. The relatively high voltage of 24 volts output by the second DC-DC converter 82 is supplied to such a temperature control device. The temperature control device in this embodiment includes a radiator device 34 for dissipating heat from the refrigerant cooling the FC stack 11, and the relatively high voltage of 24 volts (second voltage) output by the second DC-DC converter 82 is supplied to the radiator device 34. The temperature control device includes a heater 86 for heating the FC stack 11. The relatively high voltage output by the second DC-DC converter 82 can also be supplied to the heater. The relatively high voltage output by the second DC-DC converter 82 can also be supplied to an air conditioning device such as a refrigeration compressor 85.

[0101] In addition, the work vehicle 100 may also include a third voltage conversion circuit that converts the high voltage output by the FC module 10 into a third voltage higher than the second voltage. The third voltage is, for example, 48 volts. When the work vehicle 100 includes another motor different from the motor 70, for example, the third voltage may be used as a power source for such another motor.

[0102] In an agricultural work vehicle equipped with a fuel cell power generation system, in addition to electrical components required for agricultural work, electrical components required for fuel cell power generation are also included, so the magnitude of voltage suitable for each electrical component may be different. According to the embodiment of the present disclosure, an appropriate magnitude of voltage can be supplied.

[0103] exist Figure 3 In the example of FIG. 5 , a plurality of fuel tanks 50 are housed in a tank case 51. The fuel tanks 50 are connected to a filling port (fuel filling port) 52 for filling fuel from the outside. This connection is performed by a pipe 21 for flowing the fuel gas. In addition, the fuel tanks 50 are connected to the FC module 10 via the pipe 21 provided with an on-off valve 20. When hydrogen is used as the fuel gas, these pipes 21 can be formed of a material with high resistance to hydrogen embrittlement, for example, austenitic stainless steel such as SUS316L.

[0104] As described later, the tank case 51 is provided with a valve space 53, and various valves including a pressure reducing valve are arranged in the valve space 53. The piping 21 connects the fuel tank 50 and the FC module 10 via various valves provided in the valve space 53. The fuel gas whose pressure is reduced by the pressure reducing valve flows in the piping 21 connecting the tank case 51 and the FC module 10. When the fuel gas is hydrogen, the fuel tank 50 can be filled with high-pressure hydrogen of, for example, 35 MPa or more, but the hydrogen after passing through the pressure reducing valve can be decompressed to, for example, about 2 atmospheres or less.

[0105] Next reference Figure 4 .exist Figure 4 In addition to Figure 3 In addition to the description of , a plurality of ECUs and a user interface 1 that communicate within the work vehicle 100 are also described. The communication can be performed via a CAN bus wiring or the like that serves as a path (thin solid line) for electrical signals. Figure 4 The cooling system for achieving thermal management of the components is also described. Specifically, the path of the cooling liquid is schematically shown (dashed line).

[0106] In addition, as described above, the first DC-DC converter 81 and the second DC-DC converter 82 can output voltages of different magnitudes. The first DC-DC converter 81 and the second DC-DC converter 82 are also provided with an ECU that controls the respective voltage conversion circuits. Similar to other ECUs, the relatively low first voltage output by the first DC-DC converter 81 is provided to these ECUs.

[0107] exist Figure 4 In the example, the work vehicle 100 has a cooling system that circulates coolant using coolant pumps 31A and 31B. These coolant pumps 31A and 31B are arranged inside the FC module 10. The cooling system in this example includes a first radiator device 34A that is responsible for cooling the FC stack 11 and a second radiator device 34B that is responsible for cooling other electrical components. The cooling system has a flow path (first flow path) for the coolant to flow between the FC stack 11 and the first radiator device 34A. In addition, the cooling system has a flow path (second flow path) for the coolant to flow between the electrical components including the motor 70 and the second radiator device 34B. In addition, in Figure 4 In the example, for example, a heater core 87 for heating the cabin is provided, and the coolant flowing in the first radiator device 34A flows in the heater core 87 .

[0108] The user interface 1 includes an operating device 2 such as an accelerator pedal (or accelerator lever) and a main ECU 3 connected to the operating device 2. The main ECU 3 is connected to a main meter 4. The main meter 4 can display various parameters that determine the driving state or the operating state of the work vehicle 100. The user interface 1 also includes an FC system ECU 5 for controlling the FC power generation system. The FC system ECU 5 is connected to an FC meter 6. The FC meter 6 can display various parameters that determine the operating state of the FC power generation system.

[0109] The cells of the battery pack 80 are controlled by a battery management unit (BMU). The BMU has a circuit and a CPU (Central Processing Unit) for monitoring the voltage of each cell of the battery, monitoring overcharge / overdischarge, and controlling the cell balance. These circuits and the CPU can be mounted on a battery controller substrate.

[0110] 4. <Implementation Method>

[0111] Next, refer to Figures 5 to 7 , the basic structure of an embodiment of the work vehicle disclosed in the present invention is described. Figure 5 It is a side view schematically showing a configuration example of a work vehicle 200 in the present embodiment. Fig. 6A 2 is a side view schematically showing an example of the arrangement relationship of the main parts in the work vehicle 200. Figure 6B This is its top view. Figure 7 It is a diagram schematically showing a mechanism for supporting the fuel tank 50 .

[0112] 4.1. Fixed framework

[0113] The work vehicle 200 in this embodiment includes the FC module 10, the fuel tank 50, the motor 70, the driver's seat 107, and the vehicle body 102. Figure 1 The structure is the same as the structure in the work vehicle 100 described above.

[0114] In the present embodiment, the fuel tank 50 is supported by the fixed frame 120. The fixed frame 120 is fixed to the vehicle body 102 across the driver's seat 107. In the work vehicle 200 of the present embodiment, the fuel tank 50 can be stably supported above the driver's seat 107 by the structure and function of the fixed frame 120. As a result, the degree of freedom in the arrangement of components such as the FC module 10 and the motor 70 supported by the vehicle body 102 is improved. In addition, the necessity of significantly changing the structure of the conventional engine-driven tractor is also reduced. These contribute to the reduction of design cost and manufacturing cost.

[0115] Hereinafter, a configuration example of the fixed frame 120 will be described.

[0116] In this embodiment, the fixed frame 120 is a long-axis structure such as a pipe fixed to the vehicle body 102. Fig. 6AAs shown, the fixed frame 120 has a front portion 120A, a middle portion 120B, and a rear portion 120C. The front portion 120A has a curved shape and is connected to the middle portion 120B. The middle portion 120B has a shape extending in a straight line in the front-to-back direction and is connected to the rear portion 120C. The rear portion 120C has a shape extending in a straight line in the vertical direction. In addition, the shape of the fixed frame 120 shown in the figure is only an example, and the shape of the fixed frame 120 is not limited to this example.

[0117] In this embodiment, the vehicle body 102 includes: a front frame 102A that rotatably supports the front wheel 104F; and a transmission case 102B that rotatably supports the rear wheel 104R. Fig. 6A As shown, one end (front end) 128 of the fixed frame 120 is fixed to the front frame 102A. The other end (rear end) 129 of the fixed frame 120 is fixed to the transmission box 102B. Depending on the material of the fixed frame 120, these fixations can be performed by suitable methods such as welding or bolting. The fixed frame 120 can be formed of, for example, metal, synthetic resin, carbon fiber, or a composite material such as carbon fiber reinforced plastic or glass fiber reinforced plastic. The transmission box 102B includes a rear axle box, and the rear end 129 of the fixed frame 120 can be fixed to the rear axle box. In addition, in the case where the fixed frame 120 is formed of metal, part or all of its surface may also be covered with a synthetic resin.

[0118] The fixed frame 120 is required to have sufficient rigidity for supporting the fuel tank 50. When the work vehicle 200 travels on an uneven ground, the fuel tank 50 supported by the fixed frame 120 may vibrate up and down or forward and backward and left and right. Since a part or all of the fixed frame 120 is appropriately bent by utilizing the elastic deformation of the fixed frame 120, the impact on the fuel tank 50 is mitigated. In order to obtain the effect of alleviating such impact, the front portion 120A of the fixed frame 120 has a curved shape, and it is effective to allow deformation within a prescribed range. A part or all of the rear portion 120C of the fixed frame 120 may have a curved or inclined shape.

[0119] The outer shape of the cross section perpendicular to the long axis direction in the fixed frame 120 is, for example, a circle or an ellipse, but is not limited thereto. The outer shape of the cross section may also be a quadrilateral or other polygon. In the case where the fixed frame 120 is roughly in the shape of a cylinder or a column, its outer diameter is, for example, in the range of 10 mm to 100 mm. In addition, the inner diameter may be a size of 0% to 90% of the outer diameter.

[0120] like Figure 5As shown, the work vehicle 200 has a cab 105 surrounding a driver's seat 107 between a vehicle body 102 and a fixed frame 120. The driver's seat 107 is located in the rear part of the interior of the cab 105 (referred to as "cab interior"). In front of the driver's seat 107, for example, a steering wheel (steering wheel) 106 for changing the direction of the front wheel 104F is provided. The cab 105 has a cab frame constituting a skeleton. A roof 109 is provided on the upper part of the cab frame. The cab frame of the present embodiment is a four-column type. The cab 105 is supported on the transmission box 102B of the vehicle body 102, for example, via an anti-vibration mount. Refer to Figure 4 The user interface 1 described above is provided inside the cab 105. The cab 105 does not directly support the fuel tank 50, and therefore does not need to be particularly strong, and a cab used for a conventional tractor can be adopted.

[0121] The middle portion 120B of the fixing frame 120 extends in the front-rear direction along the roof 109 of the cab 105 and functions as a support portion (support member) for the fuel tank 50. The fuel tank 50 is supported above the roof 109 of the cab 105 by the middle portion 120B of the fixing frame 120.

[0122] Next, refer to Figure 6B In this embodiment, the fixed frame 120 includes two frames located on the left and right sides of the work vehicle 200, rather than one frame. Figure 6B In the top view of the work vehicle 200, the left and right fixed frames 120 extend in parallel in the front-rear direction of the work vehicle 200. The two fixed frames 120 are located at a position avoiding the central area of ​​the field of vision of the operator who sits on the driver's seat 107 and looks forward. The number of fixed frames 120 may be one, or may be three or more. The fixed frames 120 are preferably arranged at a position avoiding the central area of ​​the field of vision of the operator who sits on the driver's seat 107 and looks forward, and support the fuel tank 50 in a balanced manner. From this point of view, it is preferred that the number of fixed frames 120 is an even number.

[0123] like Figure 6B As shown, in the top view from directly above, each fixing frame 120 does not need to pass directly above the driver's seat. The fixing frame in the present disclosure "spanning the driver's seat" is fixed to the vehicle body, such as Fig. 6A As shown, in a side view, a portion of the fixed frame fixed to the vehicle body extends in the front-rear direction above the driver's seat 107 or above the cab 105. Figure 6B In the example, the two fixed frames 120 are parallel to each other, but the interval between the fixed frames 120 does not need to be constant along the front-to-back direction, and may also be variable.

[0124] The work vehicle 200 has a mounting platform 51A connecting the left side frame 120 and the right side frame 120. The fuel tank 50 can be arranged on the mounting platform 51A. In the case where there are a plurality of fuel tanks 50, the plurality of fuel tanks 50 can be arranged in a fuel tank module. The fuel tank module has a tank box 51 ( Figure 5 The left and right fixing frames 120 may be connected to each other by a member other than the mounting table 51A.

[0125] A connection device 108 is provided at the rear portion of the vehicle body 102, i.e., the rear end of the transmission box 102B. The connection device 108, for example, includes a three-point support device (also called a "three-point link" or a "three-point hook"), a PTO shaft, a universal joint, and a communication cable. The connection device 108 can be used to load and unload the working tool 190 relative to the working vehicle 200. The connection device 108 can, for example, raise and lower the three-point link through a hydraulic device to change the position or posture of the working tool 190. In addition, power can be transmitted from the working vehicle 200 to the working tool 190 via the universal joint. The working vehicle 200 can tow the working tool 190 and enable the working tool 190 to perform a prescribed operation (agricultural operation). The connection device 108 can also be provided at the front portion of the vehicle body 102. In this case, the working tool 190 can be connected in front of the working vehicle 200.

[0126] Next, refer to Figure 7 , an example of a structure in which the fuel tank 50 is supported by the fixed frame 120 will be described.

[0127] exist Figure 7 In the example of , the mounting platform 51A of the fuel tank 50 is fixed to the middle part 120B of the fixed frame 120. This fixation can be achieved, for example, by a connector 127 such as a pipe mounting metal fitting. The fuel tank 50 is fixed to the mounting platform 51A, for example, by a fixing belt 56. A cover 51B is installed on the mounting platform 51A in a manner that covers the fuel tank 50 and can be attached and detached or opened and closed. The tank case 51 in this example is composed of the mounting platform 51A and the cover 51B. The tank case 51 functions as a part of at least one container that accommodates the FC module 10 and the fuel tank 50.

[0128] The cover 51B in this embodiment has a curved surface portion 51C connected from the upper surface portion 51T to the surrounding side portions 51S. The height of the cover 51B is highest at the upper surface portion 51T, and the height of the curved surface portion 51C decreases as it approaches the side portions 51S. By adopting a cover 51B of such a shape, the following effects can be obtained: the cover 51B can suppress rain from accumulating in the tank body 51, and snow accumulated on the tank body 51 can be easily dropped. The tank body 51 may also be provided with an opening for discharging the fuel gas leaked from the inside to the outside. Preferably, a member such as a cover covering the opening is provided at such an opening to make it difficult for rain, dust, etc. to invade the inside of the tank body 51. The tank body 51 can be formed of metal, synthetic resin, carbon fiber, or a composite material such as carbon fiber reinforced plastic or glass fiber reinforced plastic.

[0129] Inside the tank case 51, the fuel tank 50 is connected to the pipe 21 for flowing the fuel gas via a valve 57 such as a pressure reducing valve and a solenoid valve. The pipe 21 inside the tank case 51 passes through an opening provided in the mounting table 51A, for example, and is connected to the pipe 21 outside the tank case 51. Figure 7 In the example of FIG. 1 , a part of the piping 21 located outside the tank case 51 is disposed inside the middle portion 120B of the fixed frame 120. In other words, a part of the piping 21 connecting the fuel tank 50 and the FC module 10 is located inside the fixed frame 120. The piping 21 connecting the tank case 51 and the FC module 10 is configured to allow the fuel decompressed by the decompression valve to pass therethrough. A wiring cable is connected to the valve 57 such as a solenoid valve. A part or all of the wiring cable may pass through the inside of the fixed frame 120.

[0130] The pipes 21 and wiring cables may not be arranged inside the fixing frame 120 but may be arranged along the outer surface of the fixing frame 120. However, in order for the rigid fixing frame 120 to perform the function of protecting the pipes 21 and wiring cables, they are preferably arranged inside the fixing frame 120.

[0131] The fixed frame 120 does not need to be fixed to the roof 109 of the cab 105. Figure 7 As shown, there may be a gap (clearance) between the roof 109 of the cab 105 and the middle portion 120B of the fixed frame 120. When the work vehicle 200 travels on an uneven ground, the up and down vibration of the cab 105 and the up and down vibration of the tank body 51 supported by the fixed frame 120 do not need to be consistent in amplitude and frequency. Figure 7 In the example of FIG. 1 , a shock absorber 54 is provided between the roof 109 and the mounting platform 51A. By means of such a shock absorber 54, even when the work vehicle 200 moves up and down greatly, it is possible to suppress the collision between the mounting platform 51A and the roof 109.

[0132] In the present embodiment, the rear portion 120C of the fixed frame 120 supports the mounting table 51A in a state extending in the vertical direction. Figure 5 , Fig. 6A ). In the case where the rear portion 120C of the fixed frame 120 is formed of a material such as metal that is difficult to expand and contract in the longitudinal direction, the rear portion 120C plays a role in suppressing the up and down movement of the mounting platform 51A relative to the vehicle body 102. On the other hand, in the case where the cab 105 is supported on the vehicle body 102 via the anti-vibration bracket 105B, the vibration of the cab 105 relative to the vehicle body 102 may exhibit a different behavior from the vibration of the mounting platform 51A relative to the vehicle body 102. In the case where a shock absorber 54 is provided between the roof 109 and the mounting platform 51A, the coupled vibration of the cab 105 and the fuel tank 50 can be controlled by adjusting the attenuation ratio of the shock absorber 54. The type, number and position of the shock absorber 54 can be determined in consideration of the size and weight of the tank body 51. In addition, the cab 105 and the mounting platform 51A may be coupled by an elastic member such as a spring or rubber instead of or together with the shock absorber 54. The shock absorber 54 and / or the elastic member may be configured to couple the middle portion 120B of the fixing frame 120 to the cab 105 instead of the mounting table 51A.

[0133] Furthermore, unlike the present embodiment, when the fuel tank 50 is firmly fixed to the cab 105 by, for example, welding or a connecting metal member such as a flange bolt, the cab 105 moves or vibrates integrally with the fuel tank 50 during driving. In contrast, in the present embodiment, since a certain degree of freedom of movement is allowed between the cab 105 and the fuel tank 50, the vibration mode of the cab 105 can be separated from the vibration mode of the fuel tank 50. This can provide, for example, a sound insulation effect in the cab interior.

[0134] As described above, when a portion of the pipe 21 is disposed inside the fixed frame 120, the fuel filling port connected to the pipe 21 may be disposed in the fixed frame 120. Figure 3 , Figure 4 ) will be described in detail later.

[0135] 4.2. Fuel tank module

[0136] Next, refer to Figure 8 , the structural example of the fuel tank module is explained. Figure 8 , an X-axis and a Y-axis orthogonal to each other are shown for reference.

[0137] Figure 8 The fuel tank module 55 in the example includes a plurality of fuel tanks 50 , a valve system 58 connected to the plurality of fuel tanks 50 , and a tank case 51 accommodating the plurality of fuel tanks 50 and the valve system 58 .

[0138] The valve system 58 includes an on-off valve and a pressure reducing valve located in the tank body 51. In addition, the valve system 58 accommodated in the tank body 51 may also include a check valve, a filter, a safety valve, a pressure sensor, and a discharge pipe. These devices included in the valve system 58 are connected by high-pressure or low-pressure piping.

[0139] The tank case 51 has a bottom plate extending along a plane (XY plane) defined by the X-axis direction (first direction) and the Y-axis direction (second direction), and a plurality of fuel tanks 50 are placed on the bottom plate. In the present embodiment, the bottom plate also serves as a mounting table 51A. In addition, the shape of the mounting table 51A does not need to be a flat plate, and may also have ridges and grooves for increasing strength. In addition, the mounting table 51A may also have convex portions, concave portions and / or opening holes for fixing other components such as the fuel tanks 50, the cover 51B and the valve.

[0140] The plurality of fuel tanks 50 in this embodiment are high-pressure hydrogen tanks each having a cylindrical portion extending in the X-axis direction. The outer diameter of the cylindrical portion may be, for example, about 300 mm. An example of the fuel tank 50 is a resin high-pressure hydrogen tank, which may be formed by a multilayer structure formed by laminating a resin liner, carbon fiber reinforced plastic, or glass fiber reinforced plastic.

[0141] In this example, the plurality of fuel tanks 50 include a first fuel tank 50A having a first length L1 in the X-axis direction, a second fuel tank 50B having a second length L2 in the X-axis direction that is shorter than the first length L1, and a third fuel tank 50C having a third length L3 in the X-axis direction that is shorter than the first length L1. In addition, in other embodiments of the present disclosure, the third fuel tank 50C is not required, and other fuel tanks may also be provided. The number of fuel tanks 50 provided in a fuel tank module 55 is not limited to three, as long as it is plural. In addition, in Figure 8 In the example, the third length L3 is equal to the second length L2, but the third length L3 may be different from the second length L2.

[0142] The first fuel tank 50A, the first fuel tank 50A and the third fuel tank 50C are arranged (side by side) in the Y-axis direction perpendicular to the X-axis direction. At least a part of the valve system 58 is arranged in the space formed between the first fuel tank 50A and the tank case 51 in the tank case 51. In addition, at least another part of the valve system 58 is arranged in the space formed between the third fuel tank 50C and the tank case 51 in the tank case 51. In other words, the valve system 58 is arranged in the valve space 53 located in the space from the first fuel tank 50A and the third fuel tank 50C to the tank case 51. The size of L1-L2 and L1-L3 is determined based on the size of the space required as the valve space 53. In the present embodiment, for example, when L1=about 700 mm, it is set to L1-L2=L1-L3=100 mm or more and 200 mm or less.

[0143] In this way, by accommodating the fuel tanks 50 having different lengths in the tank case 51, a space suitable for accommodating components can be formed in the tank case 51, and the space can be used as the valve space 53. By arranging a plurality of valves including, for example, an on-off valve and a pressure reducing valve in the valve space 53, the function of the fuel tank module 55 can be improved. Specifically, by utilizing the function of the pressure reducing valve in the tank case 51, the pressure of the fuel can be reduced from, for example, 35 MPa to about several atmospheres and then discharged to the outside of the tank case 51. As a result, it is not necessary to use expensive piping for high-pressure hydrogen as the piping 21 for connecting the tank case 51 and the FC module 10.

[0144] Next, refer to Figure 8 An example of a structure for filling the fuel tank 50 of such a fuel tank module 55 with fuel will be described below.

[0145] exist Figure 8 In the example shown, the fuel filling device 90 includes a fuel storage unit 91, a shutoff valve 92, a regulator 93, a cooling unit 94, and a distributor nozzle 95. The fuel filling device 90 can be installed at a specific location, or can be mounted on a mobile body such as a truck to function as a mobile station. The distributor nozzle 95 of the fuel filling device 90 is connected to the cooling unit 94 via a flexible fuel hose. After the operator who performs fuel filling inserts the distributor nozzle 95 into the fuel filling port 52 of the work vehicle 200, the filling of fuel (high-pressure hydrogen) is started.

[0146] The fuel filling port 52 of the work vehicle 200 has a receiver 96 that receives the supply of fuel from the distributor nozzle 95 of the fuel filling device 90. When the distributor nozzle 95 is inserted into the fuel filling port 52, the receiver 96 is inserted into the opening hole provided at the top end of the distributor nozzle 95. The fuel injected from the distributor nozzle 95 into the receiver 96 is supplied to the fuel tanks 50A, 50B, and 50C arranged in the tank case 51 of the fuel tank module 55 through the pipe 21 provided with a check valve 97 in the middle. The fuel tanks 50A, 50B, and 50C are connected to the pipe 21 via electromagnetic valves 57A, 57B, and 57C, respectively.

[0147] By selectively opening the electromagnetic valves 57A, 57B, and 57C, the fuel is filled from the fuel filling device 90 into any of the corresponding fuel tanks 50A, 50B, and 50C.

[0148] 4.3. Fuel gas sensor

[0149] In the present embodiment, the FC module 10 and the fuel tank 50 are housed in at least one "housing body". Fig. 9 2 is a diagram schematically showing the flow of fuel (hydrogen) gas leaking from the front housing 110 and the tank case 51 serving as such a container. Fig. 9 In FIG. 1 , the flow of leaked fuel gas is schematically indicated by a dotted arrow. Such fuel gas leakage may occur from the FC module 10, the fuel tank 50, the valve system 58, and the piping 21. Fig. 9 In the example of FIG. 1 , the pipe 21 connecting the fuel tank 50 and the FC module 10 passes through the interior of the fixing frame 120 and is inserted into the interior of the front housing 110 .

[0150] The work vehicle 200 in this embodiment has at least one fuel gas sensor disposed in the housing. In this embodiment, the fuel gas is hydrogen, so examples of the fuel gas sensor may include hydrogen sensors that operate in various ways such as contact combustion, gas heat conduction, solid electrochemical, and semiconductor. When the fuel gas sensor detects a leak of the fuel gas, it is possible to perform notification / warning to the driver, fail-safe control in the FC power generation system, or stop the operation, etc., according to the concentration level of the leaked fuel gas.

[0151] The container in this embodiment, i.e., the front housing 110 and the tank box 51, respectively have a shape and structure that controls the diffusion of hydrogen gas leaked thereinto into the atmosphere and facilitates the detection of hydrogen gas. Specifically, the upper surface 110T of the front housing 110 has a shape that gradually or stepwise becomes higher from the front end side of the work vehicle 200 toward the rear direction. Since the hydrogen gas leaked in the front housing 110 is lighter than air, it flows in the rear direction along the upper surface 110T of the front housing 110 and approaches the front surface 105F of the cab 105. In addition, a part of the fuel gas leaked from the pipe 21 in the front housing 110 or the connection portion between the FC module 10 and the pipe 21 can rise along the front surface 105F of the cab 105.

[0152] In this embodiment, the width of the front housing 110 is designed to be narrower than the wheel interval of the front wheels 104F. This is different from the case where the hood of a passenger car covers the left and right front wheels and the width of the hood is wider than the wheel interval of the front wheels. By making the width of the front housing 110 narrower than the wheel interval of the front wheels 104F, the volume of the front housing 110 can be relatively reduced. By reducing the volume of the front housing 110, the fuel gas sensor can be easily detected at the stage before the leaked hydrogen is diluted.

[0153] As described above, the height of the tank body 51 in this embodiment is highest at the top surface 51T, and the height of the curved surface 51C decreases as it approaches the side surface 51S. Therefore, hydrogen gas leaking from the tank body 51 tends to gather in the upper portion inside the peripheral area of ​​the tank body 51.

[0154] In addition, the tank body 51 in the present embodiment is arranged at a position higher than the front housing 110 behind the front housing 110. Therefore, when the front housing 110 and the tank body 51 are connected by the pipe 21, hydrogen gas leaked in the front housing 110 may enter the inside of the tank body 51 through some path. In the "container" of the FC power generation system, the tank body 51 is located at the highest position. Therefore, when the container forms a connected space, hydrogen gas leaked inside the container is likely to gather in the tank body 51, more specifically, it is likely to gather near the upper surface portion 51T of the tank body 51, which is the highest part of the container.

[0155] exist Fig. 9In the example of , the fuel gas sensor includes a first sensor 45 provided inside the front housing 110 and a second sensor 46 provided inside the tank body. The first sensor 45 is arranged in a relatively high area inside the front housing 110, that is, in an area where the fuel gas gathers. Specifically, the first sensor 45 is arranged inside the front housing 110 in an area close to the front surface 105F of the cab 105 and the upper surface 110T of the front housing 110. In addition, the second sensor 46 is provided inside the tank body 51 at a position higher than the valve system 58, preferably at the lower side of the upper surface portion 51T of the tank body 51. The second sensor 46 is provided at a position higher than the first sensor 45, and in the work vehicle 200, it functions as a fuel gas sensor provided at the highest position.

[0156] 4.4. Radiator device

[0157] Next, refer to Fig.10 and Fig.11 , the structure of the radiator device in this embodiment is described. Fig.10 and Fig.11 They are a side view and a plan view schematically showing an example of arrangement of the heat sink device in the present embodiment.

[0158] As described above, the work vehicle 200 in this embodiment has Figure 4 The cooling system is a cooling system in which the cooling liquid pumps 31A and 31B circulate the cooling liquid. Fig.10 and Fig.11 As shown, the work vehicle 200 includes a first radiator device 34A disposed on one side (rear) of the FC module 10 and a second radiator device 34B disposed on the other side (front) of the FC module 10 .

[0159] The first heat sink device 34A is used to heat the FC stack 11 (see Figure 4 ) is connected to a flow path (first flow path) for cooling. On the other hand, the second radiator device 34B is connected to a flow path (second flow path) for cooling electrical components including the motor 70. In this way, the cooling system of the work vehicle 200 of the present embodiment includes a first radiator device 34A responsible for cooling the FC stack 11 and a second radiator device 34B responsible for cooling other electrical components. The capacity for cooling the FC stack 11 is preferably higher than the capacity for cooling other electrical components. In order to improve the cooling capacity of the radiator device, it is necessary to expand the area of ​​the front surface of the radiator device and increase the area (core size) of the core portion of the heat exchanger in contact with the air. Therefore, in the present embodiment, the area of ​​the front surface of the first radiator device 34A is made larger than the area of ​​the front surface of the second radiator device 34B. Specifically, as Fig.11As shown, the width W1 of the first radiator device 34A is larger than the width W2 of the second radiator device 34B. In addition, in this embodiment, the width W2 of the second radiator device 34B is smaller than the width W0 of the FC module 10, and the width W1 of the first radiator device 34A is larger than the width W0 of the FC module 10.

[0160] Generally, the radiator device in a passenger car is arranged in front of the engine. Therefore, the first radiator device 34A for cooling the FC module 10 may be arranged in front of the FC module together with the second radiator device 34B. However, in this embodiment, by deliberately arranging the first radiator device 34A at the rear of the FC module 10, the following effects can be achieved.

[0161] First, the height and width of the front portion of the front housing 110 can be made smaller than the height and width of the rear portion. Specifically, the front housing 110 in this embodiment includes a first portion 110T1 located on the rear side and a second portion 110T2 located on the front side, and the height and width of the second portion 110T2 are smaller than the height and width of the first portion 110T1. On the contrary, when the first radiator device 34A with a large size is arranged in front of the FC module 10, or when both the first radiator device 34A and the second radiator device 34B are arranged in front of the FC module 10, it is necessary to increase the width of the second portion 110T2 of the front housing 110. However, if the width of the front housing 110 is made larger than the interval between the left and right front wheels and the front wheels 104F are covered by the front housing 110, when the operator sitting in the driver's seat 107 looks forward, the front housing 110 becomes an obstacle and it is difficult to visually confirm the position and direction of the front wheels 104F, for example, it is difficult to accurately steer along an agricultural road or a ridge.

[0162] On the other hand, according to the present embodiment, since it is not necessary to increase the width of the second portion 110T2 of the front housing 110 , when the operator sitting in the driver's seat looks forward, there is no problem of narrowing the field of vision due to the enlarged front housing 110 .

[0163] There is no such restriction on the width W1 of the first radiator device 34A disposed at the rear of the FC module 10, that is, right in front of the cab 105. Even if the height and width of the first portion 110T1 located at the rear side of the front housing 110 are increased compared to the conventional example, the forward field of vision of the operator sitting in the driver's seat 107 is hardly affected. Therefore, the first radiator device 34A can have a sufficient width W1 and height T1 by increasing the first portion 110T1 of the front housing 110 within a necessary range. The height difference T1-T2 between the two radiators 34A and 34B is, for example, within a range of 10 mm or more and 300 mm or less, and the width difference W1-W2 is, for example, within a range of 20 mm or more and 500 mm or less.

[0164] Furthermore, by arranging the two radiator devices 34A and 34B on opposite sides of the FC module 10 , the problem of thermal interference between the two radiator devices 34A and 34B is also solved.

[0165] Preferably, the front housing 110 has at least one opening portion that introduces an air flow that contacts the first heat sink device 34A and / or the second heat sink device 34B. A portion of such an opening portion can be realized by a gap formed between the first portion 110T1 and the second portion 110T2 in the front housing 110. Such a gap can be formed by making the height and width of at least a portion of the front end of the first portion 110T1 of the front housing 110 greater than the height and width of the rear end of the second portion 110T2.

[0166] The FC module 10 is preferably surrounded by a frame having side surfaces and a top surface for guiding air flow from the front to the rear. By adopting such a structure, air flow can be blown to the first radiator device 34A arranged at the rear of the FC module 10 at a sufficient flow rate, thereby improving the efficiency of heat exchange in the first radiator device 34A.

[0167] In this embodiment, if Fig.10As shown, the first radiator device 34A is fixed to the front frame 102A via the support portion 34C, and the upper end (height T1) of the first radiator device 34A is located at a higher position than the upper end (height T2) of the second radiator device 34B. Specifically, the upper end (height T1) of the first radiator device 34A is higher than the height T0 of the FC module 10, and the upper end (height T2) of the second radiator device 34B is lower than the height T0 of the FC module 10. By adopting such a structure, the air guided into the front housing 110 of the traveling work vehicle 200 can flow smoothly in the rear direction in the front housing 110, and not only the heat exchange of the coolant by the second radiator device 34B can be appropriately performed, but also the heat exchange of the coolant by the first radiator device 34A can be appropriately performed.

[0168] Furthermore, the lower end of the first radiator device 34A is lifted by the support portion 34C. By using the support portion 34C, the first radiator device 34A can be arranged on the motor 70 ( Figure 5 ) above.

[0169] In addition, a necessary number of openings or gaps are appropriately provided in the front housing 110. Such openings or gaps can be used as inlets and outlets of air to form air flows.

[0170] 4.5. Configuration of fuel filling port

[0171] Next, refer to Fig.12 and Fig.13 , an example of arrangement of the fuel filling port 52 in the present embodiment will be described. Fig.12 It is a side view schematically showing an example of arrangement of the fuel filling port 52 . Fig.13 It is a side view schematically showing an example of the orientation of the fuel filling port 52 .

[0172] exist Fig.12 In the example shown, the fuel filling port 52 connected to the fuel tank 50 by the pipe 21 is provided at a position higher than the axle 104FX of the front wheel. Specifically, the fuel filling port 52 is provided at the rear portion 120C of the fixed frame 120. When the work vehicle 200 is traveling in a field while performing various agricultural operations, for example, if the fuel filling port 52 is located at a position higher than the axle 104FX of the front wheel, it is possible to prevent muddy water from intruding into the fuel filling port 52 or its surroundings, or to prevent mud splashed from the ground from adhering to the fuel filling port 52 or its surroundings. In addition, it is preferable that a lid (lid) configured to be opened and closed is provided at the fuel filling port 52.

[0173] In the case of an internal combustion engine that generates driving force by burning liquid fuel, the fuel filling port (fuel supply port) is set at a position higher than the tank of liquid fuel. In addition, the distance from the tank of liquid fuel to the fuel filling port is generally short. Therefore, in the previous agricultural tractor equipped with an internal combustion engine, the position and orientation of the fuel filling port have low freedom. In contrast, when the fuel in a high-pressure gas state is supplied to the fuel tank 50 in the FC power generation system, the fuel (hydrogen) can be easily moved from the high-pressure side to the low-pressure side in the piping 21 without relying on the orientation of the piping 21. Therefore, the position of the configuration of the fuel filling port 52 in the present embodiment does not have the restrictions of the previous fuel supply port. Therefore, as described later, in order to obtain various effects, the fuel filling port 52 can be set at a position corresponding to the target effect. In addition, the piping 21 connecting the fuel filling port 52 and the fuel tank 50 does not need to pass through the fixed frame 120.

[0174] In the example shown in the figure, the fuel filling port 52 has a receiver 96 which is inclined so as to be higher inside than the inlet. Fig.13 As shown, the central axis C of the receiver 96 forms an inclination angle α (0≤α≤90) with respect to the horizontal plane. However, at this time, the work vehicle 200 is in a stationary state on a horizontal road surface.

[0175] As described above, since the degree of freedom in the arrangement of the fuel filling port 52 is increased, the fuel filling port 52 can also be arranged at a position higher than the position of the elbow of the operator who is standing on the ground to perform the fuel filling operation. Fig.13 The tilt angle α shown is greater than 0 degrees, so that the operation of inserting the distributor nozzle 95 into the fuel filling port 52 to fill the fuel becomes easy. In addition, the tilt angle α can be made greater than 0 degrees regardless of the position of the fuel filling port 52. By setting such a tilt, it is difficult for foreign matter such as water to enter from the fuel filling port 52, and even if it enters, it is easy to be discharged to the outside. In addition, the center axis C of the receiver 96 forms an inclination angle α of, for example, more than 30 degrees and less than 90 degrees relative to the horizontal plane. In addition, the center axis C of the receiver 96 can form an inclination angle α of more than 70 degrees and less than 90 degrees relative to the horizontal plane. Depending on the position and height of the fuel filling port 52, the center axis C of the receiver 96 can also be parallel to the vertical direction. In this way, when the fuel filling port 52 is facing obliquely downward or vertically downward relative to the horizontal direction, foreign matter is difficult to enter the fuel filling port 52 and is easily discharged.

[0176] The pipe 21 preferably has a portion extending obliquely upward or vertically upward from the connection portion connected to the receiver 96. By having such a portion, it is possible to suppress foreign matter such as water from entering deep into the fuel filling port 52 from the fuel filling port 52.

[0177] 5. <Example>

[0178] 5.1. Structure of agricultural tractor

[0179] First, refer to Figures 14 to 18 , the structure of an agricultural tractor 300 as an embodiment of the working vehicle of the present disclosure will be described. Fig.14 , Fig.15 , Fig.16 , Fig.17 and Fig.18 They are respectively a perspective view, a side view, a top view, a front view, and a rear view of the agricultural tractor 300 in an embodiment of the present disclosure.

[0180] The basic structure of the agricultural tractor 300 involved in this embodiment is the same as the structure of the working vehicle involved in the above-mentioned embodiment. The following describes the parts that are different between the embodiment and the embodiment. In addition, in the drawings, the same reference numerals are marked on the corresponding structural elements between the embodiment and the embodiment.

[0181] like Fig.14 As shown, the agricultural tractor 300 in this embodiment includes: a fixed frame 120, which is fixed to the vehicle body 102 across the driver's seat 107 and supports the fuel tank module 55 having the fuel tank 50; and a front housing 110, which covers the fuel cell module 10. The front housing 110 can be opened and closed. Specifically, the front housing 110 includes: a fixed housing part 111, which is fixed to the vehicle body 102; and a movable housing part 112, which is supported by the vehicle body 102 or the fixed housing part 111 so as to be openable and closable.

[0182] In this embodiment, the fixed frame 120 also includes a left frame and a right frame. One end of each fixed frame 120 is fixed to the front frame 102A at a connection position 128 that is forward of the axle (front axle) 104FX of the front wheel 104F. Fig.14 As shown, in a top view (top view) viewed from above, the front housing 110 is located between the left and right frames and protrudes further forward than the connection position 128 .

[0183] The agricultural tractor 300 of this embodiment has a connecting rod 114 that connects the left frame and the right frame. The connecting rod 114 of this embodiment includes a plurality of rods 114A and 114B disposed at positions of different heights. Fig.16 As shown in the top view of FIG. 1 , the connecting rods 114A and 114B are connected to the left and right frames 120 at a position forward of the connection position 128 of the fixed frame 120. The connecting rod 114 has rigidity or mechanical strength to maintain a constant interval between the left and right fixed frames 120 even when an external force is applied to one or both of the left and right fixed frames 120. The connecting rod 114 is preferably formed of metal. The connecting rod 114 helps to improve the strength of the overall structure of the fixed frame 120.

[0184] like Fig.14 As shown, the agricultural tractor 300 has left and right rearview mirrors 105M and direction indicator / vehicle width lamps 105L installed on the cab 105. Fig.14 The lead-acid battery 83 and the pedal 84 for getting on and off the cab 105 are described in the figure. A headlight 130 and a work light 132 are provided on the front part of the front housing 110. In addition, a plurality of work lights are provided on the roof 109, and various sensor devices such as a laser sensor for detecting obstacles can also be provided. The positions of the devices and components of these general agricultural tractors are not limited to the examples shown in the figure.

[0185] like Fig.17 and Fig.18 As shown, in the agricultural tractor 300 of this embodiment, the fuel tank module 55 is located above the cab 105, and the left and right fixed frames 120 supporting the fuel tank module 55 span the cab 105. Fig.18 As shown, the portion of the fixing frame 120 located behind the cab 105 extends in the up-down direction between the left and right rear fenders 116. The rear end of each fixing frame 120 is fixed to the rear axle box (rear axle) 104RC.

[0186] In the present embodiment, the movable housing portion 112 is configured to accommodate the fuel cell module 10. In contrast, the fixed housing portion 111 accommodates devices included in the fuel cell power generation system, specifically, a radiator device 34A for dissipating heat from the coolant used for the fuel cell. In addition, the fixed frame 120 has a shape that does not interfere with the front housing 110 when the position or orientation of the front housing 110 (specifically, the movable housing portion 112) changes from a closed state to an open state. The connecting rod 114 connecting the left and right fixed frames 120 is arranged outside the movable range of the movable housing portion 112.

[0187] 5.2. Example of structure and arrangement of fuel filling port

[0188] Next, refer to Figures 19 to 22 , an outline of an example of the structure and arrangement of the fuel filling port 52 of the agricultural tractor 300 in this embodiment will be described. Fig.19 It is a cross-sectional view schematically showing a structural example of the fuel filling port 52 . Fig. 20 FIG. 5 is a perspective view of the fuel filler port 52 in one example. Fig.21 and Fig. 22 They are a side view and a top view of an agricultural tractor 300 showing an example of arrangement of the fuel filling port 52 in the present embodiment. Fig.21 and Fig. 22 Preferred positions Q1 to Q6 where the fuel filling port 52 is provided are schematically shown.

[0189] First, refer to Fig.19 The fuel filling port 52 in this embodiment includes a receiver 96, a housing 52C that accommodates the receiver 96, and an openable and closable lid 52L. The lid 52L is rotatably supported by the housing 52C via a hinge member 52H.

[0190] As previously described, the receiver 96 receives Figure 8 The fuel filling device 90 shown in the figure receives the supply of fuel from the distributor nozzle 95. When the distributor nozzle 95 is inserted into the fuel filling port 52, the receiver 96 is inserted into the opening hole provided at the top end of the distributor nozzle 95. Figure 8 The fuel injected into the receiver 96 by the distributor nozzle 95 is supplied to the fuel tanks 50A, 50B, and 50C through the pipes.

[0191] The specific shape of the fuel filling port 52 is not limited to Fig.19 The example shown. Fig. 20 As shown, the fuel filling port 52 in this embodiment has a cover 52L urged by a spring 52S, and the inner wall surface of the housing 52C may have a complex shape. The direction in which the receiver 96 extends does not need to be horizontal as described above.

[0192] Next, refer to Fig.21 and Fig. 22 . In the present embodiment, the fuel filling port 52 can be provided at a position Q1 on the upper part or at a position Q2 on the front part of any one of the left and right rear fenders 116. If the fuel filling port 52 is provided on the rear fender 116, the rear fender 116 located between the rear wheel 104R and the fuel filling port 52 can prevent foreign matters such as mud, muddy water, soil or sand splashed by the rear wheel 104R from adhering to the fuel filling port 52. In addition, the diameter of the rear wheel 104R is larger than the diameter of the front wheel 104F, and the rear fender 116 is located at a higher position than the front wheel 104F. By providing the fuel filling port 52 on the rear fender 116, the fuel filling port 52 can be configured to be higher than the upper end position of the front wheel 104F. This helps to prevent the fuel filling port 52 from being contaminated by splashing of foreign matters such as mud caused by the front wheel 104F.

[0193] The rear fender 116 has a relatively large curved surface covering the upper portion of the rear wheel 104R. Therefore, a position suitable for connecting the pipe 21 extending from the fuel tank 50 to the fuel filling port 52 can be appropriately selected from various regions of the rear fender 116. As a result, the fuel filling port 52 can be provided at a position suitable for shortening the length of the pipe 21 or reducing the curvature of the curved portion of the pipe 21.

[0194] As the position of the fuel filling port 52 on the rear fender 116, for example, a position higher than the upper end of the front wheel 104F and below the upper end of the rear wheel 104R can be selected. In other words, the height of the fuel filling port 52 from the ground can be larger than the outer diameter of the front wheel 104F and less than the outer diameter of the rear wheel 104R. Such a height is included in the height range suitable for the operator to fill the fuel. In addition, according to the fuel filling port 52 of the rear fender 116 fixed to such a height range, it is easy to set the inclination angle α of the center axis C of the receiver 96 to a range of, for example, greater than 0 degrees and less than 70 degrees. The center axis C of such a receiver 96 does not need to be parallel to the width direction (left-right direction) of the vehicle when viewed vertically from above, and can be inclined in the front-to-back direction of the vehicle or parallel to the front-to-back direction.

[0195] The fuel filling port 52 may also be provided at a portion other than the rear fender 116. Fig. 22 , a rectangular region R1 located between the left and right wheels of the front wheel 104F when viewed vertically from above is described. The rectangular region R1 has a width narrower than the wheel spacing of the front wheel 104F. The fuel filling port 52 can be arranged in such a rectangular region R1. Fig. 20 , a rectangular region R2 located between the left and right wheels of the rear wheel 104R is also shown. The rectangular region R2 has a width narrower than the wheel interval of the rear wheel 104R. The fuel filling port 52 may also be arranged in the rectangular region R2.

[0196] The fuel filling port 52 can be provided, for example, at a position Q3 behind the cab 105, at a position Q4 inside the cab 105, or at a position Q5 in front of the cab 105. Fig. 20 It can be seen that the position Q3 and the position Q4 in this example are located in the rectangular region R2, and the position Q5 is located in the rectangular region R1.

[0197] In the case where the fuel filling port 52 is arranged at the position Q3 behind the cab 105, by removing the working tool 190 from the connecting device 108, it is easy to ensure a wide space for the operator to perform the fuel filling operation. In particular, in the area sandwiched between the left and right rear wheels 104R, the fuel filling port 52 can be arranged at any position within a wide range in the up and down direction. For example, in a range located at a position sufficiently higher than the connecting device 108 (a range of more than 100 cm from the ground), there is an advantage that fuel can be filled even when the working tool 190 is connected to the connecting device 108. In the case where the fuel filling port 52 is arranged at such a high position, as described above, by setting the inclination angle α of the central axis C of the receiver 96 to, for example, 30 degrees or more and 90 degrees or less, preferably to 70 degrees or more and 90 degrees or less, fuel filling becomes easy. In the case where the fuel filling port 52 is arranged at the position Q3 behind the cab 105, the fuel filling port 52 can be fixed directly or indirectly to the back of the cab 105.

[0198] When the fuel filling port 52 is provided at the position Q4 inside the cab 105 , foreign matter such as mud is unlikely to enter the cab 105 from the outside, so there is an advantage that the fuel filling port 52 is unlikely to be contaminated and can be easily kept clean.

[0199] When the fuel filling port 52 is provided at position Q5 in front of the cab 105, for example, when it is provided at the fixed housing portion 111, fuel can be filled without opening the door of the cab 105. When the fuel filling port 52 is provided at the movable housing portion 112, it is necessary to form at least a portion of the piping 21 using a flexible tubular component that enables the fuel filling port 52 fixed to the movable housing portion 112 to move along with the opening and closing action of the movable housing portion 112. When the fuel filling port 52 is provided at the fixed housing portion 111, such a flexible tubular component is not particularly required. Since the fixed housing portion 111 has an upper surface and a side surface, the fuel filling port 52 can be provided on either the upper surface or the side surface of the fixed housing portion 111. The position of the fixed housing portion 111 is not limited to Fig.19 The location illustrated.

[0200] The fuel filling port 52 may be disposed at position Q6 of the internal space of the front housing 110. In this case, the fuel filling port 52 is exposed only when the movable housing portion 112 is opened, so that foreign matter such as mud can be more effectively prevented from adhering to the fuel filling port 52 during driving or operation. The fuel filling port 52 can be disposed at an appropriate position inside the front housing 110 according to the arrangement between the components. The method of opening and closing the movable housing portion 112 is not limited to Fig.19The hinge member defining the rotation axis may be located in front of the movable housing portion 112 .

[0201] Below, refer to Figures 23 to 24B , several configuration examples of the fuel filling port 52 provided in the rear fender 116 will be specifically described. Fig.23 1 is a cross-sectional view of the rear fender 116 showing an example of arrangement of the fuel filling port 52 in the present embodiment. Fig.24A and Fig. 24B Each of them is a cross-sectional view of the rear fender 116 showing another example of the arrangement of the fuel filling port 52 in the present embodiment. In these drawings, the description of the pipe for connecting the fuel filling port 52 and the fuel tank 50 is omitted.

[0202] exist Fig.23 In the example shown, the fuel filling port 52 is provided at a position Q1 on the upper part of the rear fender 116. Specifically, the position Q1 is adjacent to the rear end portion of the upper surface 116T of the rear fender 116 where lights such as the brake light 117 are arranged. External operation switches such as a three-point linkage operation switch and an automatic leveling (monroe) operation switch can be arranged at the rear end portion of the rear fender 116. Since the external operation switches are located at a position that is easy for the operator to operate, when the fuel filling port 52 is arranged near the external operation switches, fuel filling can also be easily performed.

[0203] exist Fig.23 In the example of FIG. 1 , the receiver 96 extends upward. In this case, Figure 8 The distributor nozzle 95 is inserted downward from just above the fuel filling port 52. In addition, the direction in which the central axis of the receiver 96 extends does not need to be as Fig.23 Parallel to the vertical direction as shown.

[0204] An opening is provided at a position Q1 on the upper surface 116T of the rear fender 116, and a housing 52C of the fuel filling port 52 is fitted into the opening. The surface shape of the cover 52L of the fuel filling port 52 in the closed state preferably matches the surface shape of the upper surface 116T of the rear fender 116, but a step may be formed between the cover 52L and the upper surface 116T.

[0205] There is a gap of, for example, 5 cm or more between the rear fender 116 and the rear wheel 104R, forming a space capable of accommodating the fuel filling port 52 and the piping. In this embodiment, the space has a size capable of accommodating the housing 52C of the fuel filling port 52. Fig.23In the example shown, the distance from the rear wheel 104R to the upper surface 116T of the rear fender 116 is relatively large at the upper portion of the rear fender 116. Therefore, when the fuel filling port 52 is provided at the upper portion of the rear fender 116, the handling of piping etc. can be relatively easy.

[0206] The fuel filling port 52 may be provided at a portion other than the upper portion of the upper surface 116T of the rear fender 116. Fig.24A With Fig. 24B In the example of FIG. 1 , the fuel filling port 52 is provided at a position Q2 in front of the rear fender 116 . Fig.24A In the example of FIG. 1 , the entire housing 52C of the fuel filling port 52 is inclined to match the inclination of the upper surface 116T of the rear fender 116 diagonally downward. In this case, it is easy to match the surface shape of the cover 52L of the fuel filling port 52 in the closed state with the surface shape of the upper surface 116T of the rear fender 116. Fig. 24B In the example of FIG. 1 , the direction of the housing 52C of the fuel filling port 52 is Fig.23 The housing 52C in the same direction. Fig. 24B In the example of FIG. 1 , a portion of the housing 52C is exposed from the upper surface 116T of the rear fender 116. However, a portion of the upper surface 116T of the rear fender 116 may be processed to have a shape that covers a portion or all of the housing 52C of the fuel filling port 52. From the viewpoint of protecting the fuel filling port 52, it is preferred that the portion of the fuel filling port 52 other than the cover 52L is hidden by the rear fender 116.

[0207] Thus, even if the fuel filling port 52 is provided at a portion other than the upper portion of the upper surface 116T of the rear fender 116, the space between the rear fender 116 and the rear wheel 104R can be effectively utilized. In addition, such a space can accommodate the entire fuel filling port 52 in various orientations, so the orientation of the central axis of the receiver 96 can be selected from a wide range.

[0208] Next, refer to Fig.25 , a configuration example of the fuel filling port 52 provided in the cab 105 will be specifically described. Fig.25 1 is a cross-sectional view showing another example of the configuration of the fuel filling port 52 in this embodiment. This cross-sectional view is a partial cross-sectional view when the steering wheel support cover (steering wheel column box) 106X is cut using a plane that crosses the position Q4. The steering wheel support cover 106X is provided with a display 106D for displaying various information including vehicle speed, and other operating levers. In addition, Fig.25 In order to facilitate observation, the steering wheel is not recorded.

[0209] In this example, the fuel filling port 52 is provided at a position Q4 (see FIG. 1 ) of one of the side portions 106XL and 106XR located on both sides of the steering wheel support cover 106X (the side portion 106XL). Fig.21 ). An opening is provided on the side surface 106XL of the steering wheel support cover 106X, and a housing 52C of the fuel filling port 52 is arranged to block the opening. The central axis of the receiver 96 shown in the figure is parallel to the horizontal direction (the width direction of the vehicle), but as mentioned above, it can also be inclined relative to the horizontal direction (see Fig.13 ). In this example, the surface shape of the cover 52L of the fuel filling port 52 in the closed state matches the surface shape of the steering wheel bracket cover 106X. However, a step may be generated between the cover 52L and the steering wheel bracket cover 106X.

[0210] The fuel filling port 52 is preferably provided within a range that does not hinder an operator from entering or exiting the cab 105 and does not hinder steering wheel operations or switch operations.

[0211] In addition, Fig.23 In the example shown, when the operator sitting in the driver's seat in the cab 105 looks forward, a fixed housing portion 111 is arranged on the opposite side of the steering wheel support cover 106X. The cab 105 has glass 105W on the surface surrounding the driver's seat. The glass 105W is located between the interior of the cab 105 and the fixed housing portion 111. Fig.21 As shown, the position Q4 of the fuel filling port 52 and the position of the steering wheel 106 are also low, so that the operator standing on the ground can easily fill the fuel from the outside of the cab 105. In addition, when the fuel filling port 52 is provided on the side of the steering wheel support cover 106X, even when the dispenser nozzle 95 is inserted into the fuel filling port 52, it is difficult to hinder the operator from getting on or getting off the cab 105. Therefore, there is an advantage that the operator can easily perform necessary operations inside and outside the cab 105 even during fuel filling.

[0212] Next, refer to FIG. 26A to FIG. 26C , an example of arrangement of the fuel filling port 52 of the fixed housing portion 11 provided in the front housing 110 will be described. Fig.26A 1 is a schematic cross-sectional view showing the fixed case portion of the fuel filling port 52 . Fig.26B and Fig.26C They are respectively a perspective view and a side view of the fixed case portion 111 showing an example of arrangement of the fuel filling port 52 in this example.

[0213] In this embodiment, the fixed housing portion 111 accommodates a component (in this example, the radiator device 34A) of a size that cannot be accommodated by the movable housing portion 112. The fixed housing portion 111 is arranged behind the movable housing portion 112. The fixed housing portion 111 in this embodiment has an upper surface portion 111A, a pair of side portions 111B, 111C, and a front wall 111E. The front wall 111E is located on the side of the movable housing portion 112 and has an opening portion 111D that communicates with the inside of the movable housing portion 112 in a closed state. Through the opening portion 111D, the components arranged in the fixed housing portion 111 and the components arranged in the movable housing portion 112 can be connected by piping, a coolant flow path, a cable, etc. The front wall 111E is opposite to the rear end portion of the movable housing portion 112 in a closed state. Therefore, the opening portion 111D of the fixed housing portion 111 is blocked by the movable housing portion 112 in a closed state.

[0214] In this embodiment, an opening is provided at a position Q5 of the side surface 111B of the fixed housing portion 111, and a cover 52L of the fuel filling port 52 is arranged to block the opening. The position Q5 of the fuel filling port 52 may be located at the upper surface 111A, other side surface 111C, or the front wall 111E of the fixed housing portion 111. When the fuel filling port 52 is provided at the front wall 111E, the fuel can be filled into the fuel filling port 52 by turning the movable housing portion 112 into the "open state". In this case, the cover 52L is not necessary.

[0215] In addition, if Fig.26A As shown, the central axis of the receptor 96 is parallel to the horizontal direction, but the central axis of the receptor 96 may also be inclined relative to the horizontal direction.

[0216] like Fig.26B and Fig.26C As shown, the position Q5 is close to the cab 105 , so it is easy to install the pipe connecting the fuel tank 50 located above the cab 105 and the fuel filling port 52 on the side or inside the cab 105 .

[0217] The housing 52C of the fuel filling port 52 is accommodated in an area that does not interfere with various components provided inside the fixed housing portion 111. The housing 52C has a shape, size, and orientation that is accommodated between a plurality of components accommodated in the fixed housing portion 111, or in a space formed between these components and the upper surface portion 111A, the pair of side portions 111B and 111C, and the front wall 111E of the fixed housing portion 111.

[0218] Next, refer to Fig. 27 , an example of the arrangement of the fuel filling port 52 of the movable housing portion 112 provided in the front housing 110 will be described in detail. Fig. 271 is a schematic cross-sectional view of the movable case portion 112 showing an example of arrangement of such a fuel filling port 52 .

[0219] In this example, the fuel filling port 52 is disposed in a space surrounded by the side surfaces 112L and 112R and the upper surface 112U of the movable case portion 112 , and the cover 52L closes the opening at the position Q5 provided on the side surface 112L.

[0220] like Fig. 27 As shown in FIG. 1 , when the surface of the side surface 112L of the movable housing portion 112 is a curved surface, the surface of the cover 52L of the fuel filling port 52 may also be a curved surface. The fuel filling port 52 may be fixed to the movable housing portion 112, or may be fixed to other components accommodated in the movable housing portion 112 or the front frame 102A. Fig. 27 As shown, the central axis of the receptor 96 is parallel to the horizontal direction, but the central axis of the receptor 96 may also be inclined relative to the horizontal direction.

[0221] The housing 52C of the fuel filling port 52 is accommodated in an area that does not interfere with various components provided inside the movable housing portion 112. The housing 52C has a shape, size, and orientation that is accommodated in a space formed between a plurality of components accommodated in the movable housing portion 112, or between these components and the side surfaces 112L, 112R and the upper surface 112U of the movable housing portion 112.

[0222] As described above, the present disclosure includes the work vehicles described in the following items.

[0223] [Project 1]

[0224] A working vehicle, wherein

[0225] have:

[0226] Fuel cells;

[0227] at least one fuel tank for containing fuel supplied to the fuel cell;

[0228] a motor connected to the fuel cell;

[0229] a vehicle body that supports the fuel cell, the fuel tank, and the motor, and supports the front wheels (plural in English) and the rear wheels (plural in English) so as to be rotatable; and

[0230] A fuel filling port is connected to the fuel tank by a pipe.

[0231] The fuel filling port is provided at a position higher than an axle of the front wheel.

[0232] [Project 2]

[0233] The work vehicle according to item 1, wherein:

[0234] The vehicle body has a left rear fender and a right rear fender covering at least a portion of each of the rear wheels,

[0235] The fuel filling port is provided at an upper portion of any one of the left rear fender and the right rear fender.

[0236] [Item 3]

[0237] The work vehicle according to item 1, wherein:

[0238] The vehicle body has a left rear fender and a right rear fender covering at least a portion of each of the rear wheels,

[0239] The fuel filling port is provided at a front portion of any one of the left rear fender and the right rear fender.

[0240] [Item 4]

[0241] The work vehicle according to item 1, wherein:

[0242] The work vehicle further includes a driver's seat supported by the vehicle body and a cab surrounding the driver's seat.

[0243] The fuel filling port is arranged at the rear of the cab.

[0244] [Item 5]

[0245] The work vehicle according to item 1, wherein:

[0246] The work vehicle further includes a driver's seat supported by the vehicle body and a cab surrounding the driver's seat.

[0247] The fuel filling port is disposed inside the cab.

[0248] [Item 6]

[0249] The work vehicle according to item 1, wherein:

[0250] The work vehicle further includes a driver's seat supported by the vehicle body and a cab surrounding the driver's seat.

[0251] The fuel filling port is arranged in front of the cab.

[0252] [Item 7]

[0253] The work vehicle according to item 6, wherein:

[0254] The work vehicle further includes a front housing covering the fuel cell, the front housing being supported by the front portion of the vehicle body.

[0255] The fuel filling port is provided on the front housing.

[0256] [Item 8]

[0257] The work vehicle according to item 6, wherein:

[0258] The work vehicle further includes a front housing covering the fuel cell, the front housing being supported by the front portion of the vehicle body.

[0259] The fuel filling port is disposed in the inner space of the front housing.

[0260] [Item 9]

[0261] The work vehicle according to item 1, wherein:

[0262] The fuel filling port is arranged in a rectangular region between left and right wheels of the front wheels when viewed vertically from above, and the rectangular region has a width narrower than a wheel interval of the front wheels.

[0263] [Item 10]

[0264] The work vehicle according to item 1, wherein:

[0265] The fuel filling port is arranged in a rectangular region between left and right wheels of the rear wheel when viewed vertically from above, and the rectangular region has a width narrower than a wheel interval of the rear wheel.

[0266] [Item 11]

[0267] A work vehicle according to any one of items 1 to 10, wherein:

[0268] The fuel tank is disposed at a position higher than the fuel filling port.

[0269] [Item 12]

[0270] A work vehicle according to any one of items 1 to 11, wherein:

[0271] The fuel filling port has a receptacle inclined in such a manner that the interior thereof is higher than the inlet.

[0272] [Item 13]

[0273] A work vehicle according to any one of items 1 to 12, wherein:

[0274] The working vehicle is an agricultural machine.

[0275] [Item 14]

[0276] The work vehicle according to item 13, wherein:

[0277] The work vehicle has a power output shaft driven by the motor.

[0278] [Item 15]

[0279] A working vehicle, wherein

[0280] have:

[0281] Fuel cells;

[0282] at least one fuel tank for containing fuel supplied to the fuel cell;

[0283] a motor connected to the fuel cell;

[0284] a vehicle body that supports the fuel cell, the fuel tank, and the motor, and supports the front wheels and the rear wheels so as to be rotatable; and

[0285] A fuel filling port is connected to the fuel tank by a pipe.

[0286] The fuel filling port has a receptacle inclined in such a manner that the interior thereof is higher than the inlet.

[0287] [Item 16]

[0288] The work vehicle according to item 15, wherein:

[0289] When the work vehicle is stationary on a horizontal road surface, the central axis of the receptor forms an inclination angle of 30 degrees or more and 90 degrees or less with respect to a horizontal plane.

[0290] [Item 17]

[0291] The work vehicle according to item 16, wherein:

[0292] When the work vehicle is stationary on a horizontal road surface, the central axis of the receptor forms an inclination angle of not less than 70 degrees and not more than 90 degrees with respect to the horizontal plane.

[0293] [Item 18]

[0294] The work vehicle according to item 16, wherein:

[0295] The pipe has a portion extending obliquely upward from a connection portion connected to the receiver.

[0296] [Item 19]

[0297] The work vehicle according to item 16, wherein:

[0298] The pipe has a portion extending vertically upward from a connection portion connected to the receiver.

[0299] [Item 20]

[0300] A work vehicle according to any one of items 15 to 19, wherein:

[0301] The fuel tank is disposed at a position higher than the fuel filling port.

[0302] [Item 21]

[0303] A work vehicle according to any one of items 15 to 19, wherein:

[0304] The vehicle body has a left rear fender and a right rear fender covering at least a portion of each of the rear wheels,

[0305] The fuel filling port is provided at any one of the left rear fender and the right rear fender.

[0306] [Item 22]

[0307] A work vehicle according to any one of items 15 to 19, wherein:

[0308] The vehicle body has a left rear fender and a right rear fender covering at least a portion of each of the rear wheels,

[0309] The fuel filling port is located between the left rear fender and the right rear fender.

[0310] [Item 23]

[0311] A work vehicle according to any one of items 15 to 19, wherein:

[0312] The work vehicle further includes a driver's seat supported by the vehicle body and a cab surrounding the driver's seat.

[0313] The fuel filling port is arranged at the rear of the cab.

[0314] [Item 24]

[0315] A work vehicle according to any one of items 15 to 19, wherein:

[0316] The work vehicle further includes a driver's seat supported by the vehicle body and a cab surrounding the driver's seat.

[0317] The fuel filling port is disposed inside the cab.

[0318] [Item 25]

[0319] A work vehicle according to any one of items 15 to 19, wherein:

[0320] The work vehicle further includes a driver's seat supported by the vehicle body and a cab surrounding the driver's seat.

[0321] The fuel filling port is arranged in front of the cab.

[0322] [Item 26]

[0323] The work vehicle according to item 25, wherein:

[0324] The working vehicle has a front housing for accommodating the fuel cell, the front housing being supported by the front portion of the vehicle body.

[0325] The fuel filling port is provided on the front housing.

[0326] [Item 27]

[0327] The work vehicle according to item 25, wherein:

[0328] The working vehicle has a front housing for accommodating the fuel cell, the front housing being supported by the front portion of the vehicle body.

[0329] The fuel filling port is disposed in the inner space of the front housing.

[0330] [Item 28]

[0331] A work vehicle according to any one of items 15 to 19, wherein:

[0332] The working vehicle is an agricultural machine.

[0333] [Item 29]

[0334] The work vehicle according to claim 28, wherein:

[0335] The work vehicle has a power output shaft driven by the motor.

[0336] Industrial Applicability

[0337] The technology disclosed in the present invention can be applied to work vehicles such as agricultural tractors, passenger training machines, and vegetable transplanters, for example.

[0338] Description of reference numerals:

[0339] 10 fuel cell module, 11 FC stack, 40 boost circuit, 34 radiator device, 40 boost circuit, 50 fuel tank, 51 tank case, 70 motor, 71 output shaft, 72 inverter device, 74 power transmission system, 76 power output (PTO) shaft, 80 battery pack, 81 first DC-DC converter, 82 second DC-DC converter, 83 storage battery, 85 refrigeration compressor, 86 heater, 100 work vehicle, 102 vehicle body, 102A front frame, 102B transmission box, 104 wheels, 104F front wheel, 104R rear wheel, 107 driver's seat, 120 fixed frame.

Claims

1. A working vehicle, wherein: have: Fuel cells; at least one fuel tank for containing fuel supplied to the fuel cell; a motor connected to the fuel cell; a vehicle body that supports the fuel cell, the fuel tank, and the motor, and supports the front wheels (plural in English) and the rear wheels (plural in English) so as to be rotatable; and A fuel filling port is connected to the fuel tank by a pipe. The fuel filling port is provided at a position higher than an axle of the front wheel.

2. The work vehicle according to claim 1, wherein: The vehicle body has a left rear fender and a right rear fender covering at least a portion of each of the rear wheels, The fuel filling port is provided at an upper portion of any one of the left rear fender and the right rear fender.

3. The work vehicle according to claim 1, wherein: The vehicle body has a left rear fender and a right rear fender covering at least a portion of each of the rear wheels, The fuel filling port is provided at a front portion of any one of the left rear fender and the right rear fender.

4. The work vehicle according to claim 1, wherein: The work vehicle further includes a driver's seat supported by the vehicle body and a cab surrounding the driver's seat. The fuel filling port is arranged at the rear of the cab.

5. The work vehicle according to claim 1, wherein: The work vehicle further includes a driver's seat supported by the vehicle body and a cab surrounding the driver's seat. The fuel filling port is disposed inside the cab.

6. The work vehicle according to claim 1, wherein: The work vehicle further includes a driver's seat supported by the vehicle body and a cab surrounding the driver's seat. The fuel filling port is arranged in front of the cab.

7. The work vehicle according to claim 6, wherein: The work vehicle further includes a front housing covering the fuel cell, the front housing being supported by the front portion of the vehicle body. The fuel filling port is provided on the front housing.

8. The work vehicle according to claim 6, wherein: The work vehicle further includes a front housing covering the fuel cell, the front housing being supported by the front portion of the vehicle body. The fuel filling port is disposed in the inner space of the front housing.

9. The work vehicle according to claim 1, wherein: The fuel filling port is arranged in a rectangular region between left and right wheels of the front wheels when viewed vertically from above, and the rectangular region has a width narrower than a wheel interval of the front wheels.

10. The work vehicle according to claim 1, wherein: The fuel filling port is arranged in a rectangular region between left and right wheels of the rear wheel when viewed vertically from above, and the rectangular region has a width narrower than a wheel interval of the rear wheel.

11. The working vehicle according to any one of claims 1 to 10, wherein: The fuel tank is disposed at a position higher than the fuel filling port.

12. The work vehicle according to claim 11, wherein: The fuel filling port has a receptacle inclined in such a manner that the interior thereof is higher than the inlet.

13. The working vehicle according to any one of claims 1 to 10, wherein: The working vehicle is an agricultural machine.

14. The work vehicle according to claim 13, wherein: The work vehicle has a power output shaft driven by the motor.

15. A working vehicle, wherein: have: Fuel cells; at least one fuel tank for containing fuel supplied to the fuel cell; a motor connected to the fuel cell; a vehicle body that supports the fuel cell, the fuel tank, and the motor, and supports the front wheels and the rear wheels so as to be rotatable; and A fuel filling port is connected to the fuel tank by a pipe. The fuel filling port has a receptacle inclined in such a manner that the interior thereof is higher than the inlet.

16. The work vehicle according to claim 15, wherein: When the work vehicle is stationary on a horizontal road surface, the central axis of the receptor forms an inclination angle of 30 degrees or more and 90 degrees or less with respect to a horizontal plane.

17. The work vehicle according to claim 16, wherein: When the work vehicle is stationary on a horizontal road surface, the central axis of the receptor forms an inclination angle of not less than 70 degrees and not more than 90 degrees with respect to the horizontal plane.

18. The work vehicle according to claim 16, wherein: The pipe has a portion extending obliquely upward from a connection portion connected to the receiver.

19. The work vehicle according to claim 16, wherein: The pipe has a portion extending vertically upward from a connection portion connected to the receiver.

20. The work vehicle according to any one of claims 15 to 19, wherein: The fuel tank is disposed at a position higher than the fuel filling port.

21. The work vehicle according to any one of claims 15 to 19, wherein: The vehicle body has a left rear fender and a right rear fender covering at least a portion of each of the rear wheels, The fuel filling port is provided at any one of the left rear fender and the right rear fender.

22. The work vehicle according to any one of claims 15 to 19, wherein: The vehicle body has a left rear fender and a right rear fender covering at least a portion of each of the rear wheels, The fuel filling port is located between the left rear fender and the right rear fender.

23. The work vehicle according to any one of claims 15 to 19, wherein: The work vehicle further includes a driver's seat supported by the vehicle body and a cab surrounding the driver's seat. The fuel filling port is arranged at the rear of the cab.

24. The work vehicle according to any one of claims 15 to 19, wherein: The work vehicle further includes a driver's seat supported by the vehicle body and a cab surrounding the driver's seat. The fuel filling port is disposed inside the cab.

25. The work vehicle according to any one of claims 15 to 19, wherein: The work vehicle further includes a driver's seat supported by the vehicle body and a cab surrounding the driver's seat. The fuel filling port is arranged in front of the cab.

26. The work vehicle according to claim 25, wherein: The work vehicle has a front housing for accommodating the fuel cell, the front housing being supported by the front portion of the vehicle body. The fuel filling port is provided on the front housing.

27. The work vehicle according to claim 25, wherein: The work vehicle has a front housing for accommodating the fuel cell, the front housing being supported by the front portion of the vehicle body. The fuel filling port is disposed in the inner space of the front housing.

28. The work vehicle according to any one of claims 15 to 19, wherein: The working vehicle is an agricultural machine.

29. The work vehicle according to claim 28, wherein: The work vehicle has a power output shaft driven by the motor.

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