Fuel cell-powered small work vehicle

Abstract

The challenge is to create a compact, walk-behind work vehicle that uses a fuel cell as its power source, has good weight balance, and features a compact overall body shape. [Solution] In the case of fuel cells, the fuel is hydrogen, but if the gas tank is located separately, it becomes difficult to operate in a walk-behind type vehicle. Therefore, by using the left and right wheel sections as gas tanks, the overall shape of the vehicle can be made compact.

Description

Technical Field

[0001] The present invention relates to a small work vehicle powered by a fuel cell.

Background Art

[0002] There is a work vehicle with a gas tank arranged below the operator's seat. (Patent Document 1)

Prior Art Document

Patent Document

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the prior art, there is a technique that uses a fuel cell equipped with a gas tank under a cabin that houses an operator's seat to achieve weight balance.

[0005] However, in a large vehicle, there is no problem even if it is provided below the operator's seat. In a walking-type small work machine where a person operates from the rear, if the gas tank is arranged below the vehicle body, it may not be possible to ensure a gap with the field, or if it is arranged above the vehicle body, it will block the view and result in a configuration with poor usability.

[0006] An object of the present invention is to provide a compact configuration using a fuel cell for a walking-type work vehicle.

Means for Solving the Problems

[0007] The first invention is solved by the following technical means:

[0008] The vehicle is powered by electricity generated from a fuel cell 110, and the gas tanks for storing hydrogen fuel are cylindrical in shape, serving as wheels 30 inside the left wheel 20 and wheels 50 inside the right wheel 40. Piping for transferring hydrogen from inside the gas tanks used for the wheels is supported by bearings, and the piping is positioned so as not to be affected by the rotation of the wheels.

[0009] The second invention is solved by the following technical means.

[0010] The gas tanks, wheels 30 and 50, are positioned in the center, the fuel cell 110 and electric motor 130 are positioned at the front in the direction of travel, the work equipment 160 is positioned at the rear, and the operating handle section 170 is positioned behind the work equipment 160.

[0011] The third invention is solved by the following technical means.

[0012] A battery 140 for temporarily storing electricity generated from the fuel cell 110 is placed above the electric motor 130, and is positioned alongside the fuel cell 110, along the inner surface line 181 of the exterior hood 180. [Effects of the Invention]

[0013] The first invention makes it possible to compactly house hydrogen storage tanks by utilizing the wheel positions, which were previously unused space on conventional work vehicles.

[0014] The second invention resulted in better weight distribution, making it easier to handle with a walking-type work vehicle.

[0015] The third invention allows heat generated from fuel cells, batteries, and electric motors to be dissipated without the need for a dedicated cooling device. [Brief explanation of the drawing]

[0016] [Figure 1] Perspective view of the work vehicle of the present invention, from the upper left side. [Figure 2] Left side view of the work vehicle of the present invention [Figure 3] Schematic configuration diagram of the wheel-type gas tank and piping of the work vehicle of the present invention [Figure 4] Schematic configuration diagram of the wheel-type gas tank and piping of another form of the present invention [Figure 5] Configuration diagram 1 of the fee-based rice polisher used for filling hydrogen gas in another form of the present invention [Figure 6] Configuration diagram 2 of the fee-based rice polisher used for filling hydrogen gas in another form of the present invention [Figure 7] Configuration of the rice washing and cooking machine using hydrogen gas in another form of the present invention

Mode for carrying out the invention

[0017] Hereinafter, the present invention will be described based on the embodiments shown in the drawings.

[0018] The work vehicle shown in FIGS. 1 to 7 shows an example of the present embodiment, and there are also parts where exterior parts etc. are not shown for the sake of notation of the configuration.

[0019] In agricultural machinery and construction machinery, in a work vehicle that uses power with high output for a long time, a large amount of carbon dioxide is emitted by the power using an internal combustion engine, which is not a desirable specification in terms of the environment. In the present invention, a work vehicle using a fuel cell using hydrogen is used, and by making the configuration of this work vehicle have the same arrangement relationship as that of an internal combustion engine, the operator's sense of operation is not made uncomfortable, and also by sharing exterior parts etc. that can be mutually used, a configuration that improves productivity by also using it for the specifications of an internal combustion engine is proposed.

[0020] This embodiment is a small walking management machine using a fuel cell as a power source. Although it is small, by changing the work implement provided at the rear, it can also become a work vehicle that can be used multifunctionally. In the embodiment, this small management machine is used as the work vehicle.

[0021] Furthermore, the gas tank uses hydrogen as fuel and is referred to as a hydrogen tank in the embodiment, but this is not limited by the type of gas it contains, but rather refers to any tank that holds gas.

[0022] In the direction markings for work vehicles, the directions are indicated in the left, right, up, and down directions from the perspective of a person holding the vehicle's control handle, relative to the direction of travel.

[0023] Figure 1 is an overall view of the work vehicle 100 with the exterior cover removed. The fuel cell 110 is located at the front of the work vehicle, the electric motor 130 is located at the rear, and the battery 140 is located above the electric motor 130.

[0024] This section outlines the fuel cell 110. Inside the casing of the fuel cell 110 is a layer of electrolyte 111 in the center. The fuel electrode 112, located outside of this, is filled with hydrogen gas supplied from a gas tank. Hydrogen gas consists of hydrogen molecules in which protons and electrons are bonded. However, for these hydrogen molecules to pass through the electrolyte layer 111, the protons and electrons are separated, leaving only the electrons in the fuel electrode 112, while the protons move to the air electrode 113. The air electrode 113 is opposite the fuel electrode 112, with the electrolyte 111 in between. Oxygen from the atmosphere is taken in through an intake port into the air electrode 113, which takes in the protons that have passed through the electrolyte 111, converts into water within the air electrode 113, and is discharged as water through a drain port.

[0025] The fuel electrode 112 and the air electrode 113 are connected by a power line, and the electrons separated by the fuel electrode 112 flow into the power line, making it possible to extract electricity.

[0026] In this embodiment, the electrolyte 111, fuel electrode 112, and air electrode 113 are represented in a simplified diagram with large divisions. However, to further increase efficiency, these layers can be made into thin layers, and a cooling water layer 114 can be inserted between them to reduce the heat generated between the layers.

[0027] Furthermore, although not shown in the diagram, there is a catalyst layer and a gas diffusion layer between the electrolyte layer 201 and the fuel electrode 202, which enhance the effect of separating protons and electrons from hydrogen. These configurations achieve similar effects even when the layers are thin.

[0028] Thus, it is also possible to adopt a structure in which the electrolyte 111, fuel electrode 112, and air electrode 113 are stacked in multiple thin layers, with cooling water or cooling air layers placed between them, thereby enhancing the cooling effect of the heat generated by the chemical reaction between the electrolyte 111 and the fuel electrode 112. In this case, each layer is in the form of a sheet or a thin film.

[0029] Technically, the aforementioned fuel electrode 112 and air electrode 113 are connected by fine wires, and the connected electrodes are linked together to form a power transmission line that can supply electricity, consolidating the electrical energy and charging the battery 140.

[0030] Similarly, if the structure is thin, the supply of hydrogen gas to the fuel electrode 112 and oxygen to the air electrode 113 must be distributed to each layer, requiring a supply pressure. In particular, some configurations utilize a compressor for supplying oxygen from the atmosphere.

[0031] The hydrogen gas is supplied into separator 117, while oxygen from the atmosphere is taken in through separator 118.

[0032] In this way, fuel cells generate heat and water through chemical reactions between electrodes, but they do not produce carbon dioxide like internal combustion engines.

[0033] The fuel for the fuel cell 110 is hydrogen, and the hydrogen tank for storing this hydrogen utilizes the wheel 30 located inside the left wheel 20. Since the hydrogen storage tank must be able to withstand sufficient pressure, it is desirable that the tank surface be curved. In this regard, the shape of the wheel inside the vehicle is cylindrical. As shown in Figure 3, by making the edge portion 31 of this cylinder a gentle curve, it is possible to make it function as a hydrogen tank. The overall shape can be curved, elliptical, or egg-shaped, as long as there are no surfaces that cause localized stress concentration or resistance to gas flow.

[0034] In conventionally used wheels, the inner wheel has an axle at its center, and the rotational force of this axle is transmitted to the outer tire portion to enable movement. In this invention, the entire wheel 30 is a hydrogen tank, and its rigidity is utilized to transmit power to the tire portion.

[0035] A pipe 32 for gas intake and exit is located at the end of this hydrogen tank. A bearing 33 is located on the outer circumference of this pipe 32, and the bearing 33 is connected to the wheel 30. The wheel 30 rotates when power is transmitted from a transmission gear in the transmission case 150 to a gear 35 mounted on the outer circumference of the wheel shaft. The bearing and transmission gear configuration that supports the wheel 30 shaft within the transmission case is omitted, but the wheel 30 is a rigid body via the transmission case 150 and the bearing.

[0036] In this configuration, the wheel 30 rotates, but the piping 32 that penetrates the inside of the wheel 30 does not rotate, and the stress applied to the left wheel 20 is not transmitted to the piping 32. With this structure, it is possible to use the wheel 30 as a hydrogen tank. Sealing seals 33A and 33B are fitted into the case portions at both ends of the bearing 33, sealing the inner wall of the wheel 30 and the outer wall of the piping 32, so that hydrogen gas does not leak out.

[0037] The structure of the left wheel 20 is the same as that of the right wheel 30, making them symmetrical. Both wheel 30 and wheel 50 are hydrogen tanks. Furthermore, the structure of the left wheel 20 is such that the part of the right wheel 30 other than the wheel itself is a tire, and air is contained between the wheel and the tire. The airtightness between the wheel and the tire is sufficient, and the structure is designed to ensure a pressure sufficiently above atmospheric pressure.

[0038] A pipe 52 for gas intake and exit is located at the end of the hydrogen tank. A bearing 53 is located on the outer circumference of this pipe 52, and the bearing 53 is connected to the wheel 50. The wheel 50 rotates when power is transmitted from a transmission gear in the transmission case 150 to a gear 55 mounted on the outer circumference of the wheel shaft. The bearing and transmission gear configuration that supports the wheel 50 shaft within the transmission case is omitted, but the wheel 50 is a rigid body via the transmission case 150 and the bearing.

[0039] In this configuration, the wheel 50 rotates, but the pipe 52 that penetrates the inside of the wheel 50 does not rotate, and the stress applied to the left wheel 50 is not transmitted to the pipe 52. With this structure, it is possible to use the wheel 50 as a hydrogen tank. Sealing seals 53A and 53B are fitted into the case portions at both ends of the bearing 53, sealing the inner wall of the wheel 50 and the outer wall of the pipe 52, so that hydrogen gas does not leak out.

[0040] The structure of the left wheel 20 is the same as that of the right wheel 30, making them symmetrical. Both wheel 30 and wheel 50 are hydrogen tanks. Furthermore, the structure of the left wheel 20 is such that the part of the right wheel 30 other than the wheel itself is a tire, and air is contained between the wheel and the tire. The airtightness between the wheel and the tire is sufficient, and the structure is designed to ensure a pressure sufficiently above atmospheric pressure.

[0041] Furthermore, pipes 32 and 52 are connected to pipe 70 located inside the transmission case 150. Pipe 70 exits from the top of the transmission case and connects to the separator 117 of the fuel cell 110, supplying hydrogen gas.

[0042] A valve control unit 80 is located at the connection point between the piping 70 and the separator 117. Based on commands from the work vehicle's controller 60, the valve is controlled, allowing hydrogen to enter and exit through piping 32 and piping 52. The valve control unit 80 has a hydrogen gas inlet, which can be connected to an external hydrogen gas filling device, enabling hydrogen to be filled into wheels 30 and 50 from the valve 80. Furthermore, the device can also switch between supplying hydrogen gas from wheels 30 and 50 to the separator 117 of the fuel cell 110 via valve control.

[0043] By placing valves in both the piping 32 for wheel 30 and the piping 52 for wheel 50, it becomes possible to switch between wheel 30 and wheel 50 to discharge hydrogen, ensuring even utilization without bias and maintaining left-right balance.

[0044] The first invention involves using electricity generated from a fuel cell 110 as a power source, and constructing cylindrical gas tanks for storing hydrogen fuel as wheels 30 inside the left wheel 20 and wheels 50 inside the right wheel 40 of the vehicle. Piping for transferring hydrogen from inside the gas tank used for the wheels is supported by bearings, and the piping is positioned so as not to be affected by the rotation of the wheels. The hydrogen tank has a curved surface, forming a lightweight and rigid tank. By utilizing this shape to share the vehicle's wheels, it becomes compact, and as will be explained later, the position of the wheels is at the center of the vehicle in terms of weight balance and is in a position that has little impact. The problem is that the wheels rotate, so the relationship with the piping for extracting hydrogen becomes an issue. In this invention, this is addressed by passing the piping inside the gas tank with bearings that have airtight seals, and separating the rotation of the gas tank and the piping.

[0045] The electricity generated by the fuel cell is stored in the battery 140. The battery 140 contains a battery management system that controls the rotation of the electric motor 130. In addition to turning the rotation ON and OFF, the system also controls the rotation speed and performs safety control by converting the current value of the electric motor 130 into torque.

[0046] The battery is also used as an auxiliary battery and to power the electronic monitor and CPU of the work vehicle 100.

[0047] The fuel cell 110, electric motor 130, and battery 140 generate heat when the work vehicle 100 is driven. Cooling is necessary for this, but since the work vehicle 100 is for walking and does not have a large amount of power, a natural air cooling method using airflow is used instead of forced cooling.

[0048] Figure 2 is a left side view of the work vehicle 100. The hood 180 protecting the fuel cell 110, electric motor 130, and battery 140 is curved and rises from the front to the rear of the vehicle. The heat generated by the fuel cell located at the front rises upward, but flows along the curved surface of the hood 180, and the heat is discharged to the outside as exhaust through the exhaust port 182.

[0049] Behind the fuel cell, the electric motor 130 and battery 140 are arranged in a stacked configuration. The heat generated by these two components is also expelled to the outside as exhaust through the exhaust port 182, as air flows along the curved surface of the hood 180.

[0050] The fuel cell 110, electric motor 130, and battery 140 are mounted on a frame 151 connected to the transmission case 150, and the rigidity of the work vehicle 100 is ensured by the transmission case 150 and the connecting frame 151. There is a linear gap 183 where the frame 151 and the hood 180 overlap, and outside air enters through this area, absorbs heat from the fuel cell 110, electric motor 130, and battery 140, and is exhausted from the exhaust port 182. Although not shown, it is possible to dissipate heat more efficiently by installing a suction fan at the exhaust port 182.

[0051] The fuel cell 110 and battery 140 require inspection. The battery 140 may need to be replaced, so it is desirable that it be located in a place where it can be easily removed and reinstalled. Given these characteristics, it is easier to inspect the fuel cell 110 and battery 140 if they can be checked simultaneously when the hood 180 is opened.

[0052] Furthermore, since the electric motor 130 transmits power from the output shaft 131 to the input shaft 151 of the transmission case 150 via a belt, it is desirable that the distance between them be short and close. The electric motor 130 and the transmission case 150 are positioned side-by-side in front of and behind the direction of travel, and the overall length is shortened by positioning the electric motor 130 transversely to the direction of travel. The power input to the transmission case 150 is received parallel to the output shaft 131 of the electric motor 130, and the overall length is shortened by being parallel to the rotation axis of the wheels 30 and 50. Conversely to these advantages, placing the battery 140 below the electric motor 130 would cause significant problems in terms of inspection and power transmission.

[0053] Considering the heat generation and inspectability of each component, as well as the power transmission path, the third invention involves placing the battery 140, which temporarily stores the electricity generated from the fuel cell 110, on top of the electric motor 130, and positioning it alongside the fuel cell 110 along the inner surface line 181 of the outer hood 180, thereby enabling a compact arrangement.

[0054] Since the work vehicle 100 is designed for walking, weight balance is crucial. As mentioned earlier, the fuel cell 110 is placed at the very front not only for heat dissipation but also to maintain weight balance. The rear of the work vehicle 100 has work equipment attached, and a person holds the handle, so the weight towards the rear is inevitably large.

[0055] Therefore, placing the heavy fuel cell at the front results in a good distribution. Also, the wheel, which serves as the hydrogen storage tank, will have a weight that changes depending on the amount of hydrogen stored inside, but as in this embodiment, its position in the center and lower part of the vehicle allows it to accommodate weight fluctuations.

[0056] In the second invention, by arranging the gas tanks, wheels 30 and 50, in the center, the fuel cell 110 and electric motor 130 in the front in the direction of travel, the work machine 160 in the rear, and the operating handle 170 positioned behind the work machine 160, the weight balance of the fuel cell type of the walking work vehicle can be ensured.

[0057] Figure 4 shows another form of the wheel according to the present invention. In this configuration, the internal wheels 220 and 260 are fixed to the transmission case 200 and are not allowed to rotate.

[0058] A large bearing 230 is located on the outer circumference of the wheel 220, and the tire 210 rotates independently of the wheel 220. The tire 210 may be made of rubber and have air inside, like a lifebuoy. Alternatively, it may be a tire made entirely of rubber.

[0059] A ring-type gear 211 is located inside the tire 210, and this gear 211 and the tire 210 are fixed together. The electric motor 240 is mounted on the shaft 221 of the wheel 220, and the rotation of the electric motor 240 is transmitted to the ring-type gear 211, causing the tire 210 to rotate as the ring-type gear 211 rotates. In addition, there is a large bearing 230 on the outer circumference of the aforementioned wheel, and the wheel 220 supports the tire 210, thus supporting the entire vehicle.

[0060] A large bearing 270 is located on the outer circumference of the wheel 260, and the tire 250 rotates independently of the wheel 260. The tire 250 may be made of rubber and have air inside, like a lifebuoy. Alternatively, it may be a tire made entirely of rubber.

[0061] A ring-type gear 251 is located inside the tire 250, and this gear 251 and the tire 250 are fixed together. The electric motor 280 is mounted on the shaft 261 of the wheel 260, and the rotation of the electric motor 280 is transmitted to the ring-type gear 251, causing the tire 250 to rotate as the ring-type gear 251 rotates. In addition, there is a large bearing 270 on the outer circumference of the aforementioned wheel, and the wheel 260 supports the tire 250, thus supporting the entire vehicle.

[0062] Fuel cell vehicles use hydrogen as fuel, and therefore require equipment to refuel this hydrogen. This is equivalent to a gas station for internal combustion engines. In many cases, conventional gas stations will also be equipped with equipment to refuel hydrogen tanks, but these will be concentrated in urban areas to meet the demand from general transportation systems such as automobiles.

[0063] Since the work vehicles of this invention are mainly agricultural and construction machinery, their installation at gas stations in rural areas is desirable. Based on this, the use of the charge-based rice milling equipment 300 shown in Figure 5 can be considered as a facility that can be deployed in rural areas.

[0064] The charge-based rice milling facility 300 is configured such that the building 301 is divided in the front-to-back direction by a partition wall (not shown) into a machine room 303 and a customer room 304.

[0065] The rice milling facility includes an input hopper 305 for receiving brown rice brought in by the user, a rotary valve for dispensing the brown rice from the input hopper 305, a first elevator 307 for receiving and lifting the dispensed brown rice, a stone remover 308 for separating stones mixed in the brown rice, a second elevator 309 for lifting the brown rice separated by the stone remover 8, a rice milling machine 310 for milling the brown rice into polished rice, and a polished rice tank 311 for storing the polished rice. The rice bran generated during milling is transported by air, separated by a cyclone 314 into powder and exhaust air, and the powder is transported by a conveyor 313. This powdered rice bran is stored in a bran flexible container 312.

[0066] The input hopper 305 and the polished rice tank 311 are positioned facing the passenger compartment 4, while the first elevator 307, stone remover 308, second elevator 309, and rice polishing machine 310 are positioned on the machine room 303 side. The input hopper 5 is positioned on one side of the passenger compartment 304, and the polished rice tank 311 is positioned on the other side of the passenger compartment 304. Between the input hopper 305 and the polished rice tank 311, a control panel (not visible) is provided, on its surface, which includes a polishing degree selection switch for setting the degree of polishing, a payment slot for inserting payment, a change return slot, etc.

[0067] The power source for this charge-based rice milling equipment 300 is electricity, but the electricity generated by the fuel cell 330 is stored in a temporary storage battery 340 and supplied to each motor as needed.

[0068] The fuel cell 330 uses hydrogen as fuel, and its hydrogen tank 320 is located on the outside of the building housing the pay-per-use rice milling equipment 300. By having the hydrogen tank on the outside, there are no restrictions on the size of the tank, and it can be freely positioned. Furthermore, it is easy to refuel the hydrogen tank from the outside. Alternatively, refueling can be done in a short time by simply replacing the hydrogen tank itself.

[0069] Originally intended for use as power fuel for the charge-based rice milling equipment 300, the hydrogen can also be used to refuel the work vehicle 100. A hydrogen transfer device 350 is provided, and this device is used to refuel and discharge hydrogen into the hydrogen tank 320.

[0070] Figure 6 shows the process of filling the work vehicle 100 with hydrogen through the hydrogen transfer device 350. It is also possible to transport hydrogen tanks by truck 400 and replace the hydrogen tanks in the charge-based rice milling equipment 300 or to fill the hydrogen tanks in the charge-based rice milling equipment 300.

[0071] By configuring the 300 charge-based rice milling facilities with hydrogen fuel cells, it becomes possible to use them as hydrogen refueling stations in the region.

[0072] Figure 7 shows a rice washing and cooking machine 400 that uses hydrogen as fuel. In this configuration, electricity is generated for use in the rice washing and cooking machine, which can be used to operate various components with an electric motor, and can also be used as electricity for an IH rice cooker that uses electricity.

[0073] To facilitate ease of operation and confirmation of cooking, the components for the rice washing and cooking function are located on the front. In this embodiment, the machine is designed to take brown rice and serve it as cooked rice. A brown rice input hopper 401 is located on the left side when facing the front. The input brown rice is lifted by a lifting device 401A and fed into the milling unit 402 from above. Inside the milling unit, there is a stone remover (not shown), a sorting screen to remove foreign objects such as stones, and then the brown rice is passed through a milling screen that grinds the surface of the brown rice while rotating and moving under a predetermined pressure, thereby turning the brown rice into white rice.

[0074] The rice, polished into white rice in the rice milling unit 402, is air-transported to the white rice tank 403. From the white rice tank 403, it is air-transported to the rice cooking unit 404. The rice cooking unit 404 has a suction device above the tank that sends the white rice to the storage tank below. The white rice is dispensed while being weighed by a rotary valve at the bottom of the tank and enters the rice washing tank 405. Water is supplied from the water tank 406, and the rice is washed in the rice washing tank 405. For a predetermined time, the rice is rotated and agitated by an internal rice washing device, and the rice bran is removed by replacing a predetermined amount of water.

[0075] After the final washing of the rice is complete, the white rice, along with the water, is sent to the rice cooker 407. The rice cooker 407 is an induction type and requires a large amount of electricity, which is obtained from the fuel cell 410. The fuel cell 410 is located behind the rice washing and cooking machine 400, and has a hydrogen tank 420 next to it. The hydrogen in the hydrogen tank 420 is used as fuel to generate electricity through the fuel cell.

[0076] Thus, a rice cooker that measures white rice, calculates the appropriate amount of water and washing time, washes the rice with water in a washing tank, and removes the bran from the surface, utilizes an electric motor for its operation. The electric system's movement is powered by electricity generated by a fuel cell using hydrogen from a hydrogen tank. The generated electricity can also be used as a heat source for the rice cooker. When using electricity, whether it is using electromagnetic waves to generate heat like an IH (induction heating) or using an electric heater, there is a high possibility of consuming a large amount of power. This is not a problem when the rice cooker is located in a place where an external power supply is always available, but in places where there is no power supply, a stable power supply can be provided by using a hydrogen tank and supplying fuel using gas cylinders.

[0077] Furthermore, the rice cooker 430 can also be used as a hydrogen burner that directly utilizes hydrogen. By reacting oxygen and hydrogen, combustion can be generated, and the resulting heat can be used as a heat source for the rice cooker 430. A rice cooker using a hydrogen tank can be used for temporary events in suburban areas, in mountainous regions, or as a response to disasters. [Explanation of symbols]

[0078] 20 Left wheel 30 wheels 32 Piping 33 Bearings 40 Right wheel 50 wheels 52 Piping 53 Bearings 100 work vehicles 110 Fuel Cell 130 Electric Motor 140 batteries 150 Transmission Case 160 work machines 170 Operating handle section 180 Food 182 Exhaust port

Claims

1. A walking work vehicle powered by electricity generated from a fuel cell (110), with gas tanks for storing hydrogen fuel configured in a cylindrical shape as wheels (30) inside the left wheel (20) and wheels (50) inside the right wheel (40) of the vehicle, and piping for transferring hydrogen from inside the gas tanks used for the wheels supported by bearings, with the piping positioned so as not to be affected by the rotation of the wheels.

2. A walking-type work vehicle according to claim 1, wherein the wheels (30) and wheels (50), which are gas tanks, are positioned in the center, the fuel cell (110) and electric motor (130) are positioned in the front in the direction of travel, the work machine (160) is positioned in the rear, and the operating handle (170) is positioned behind the work machine (160).

3. A walking-type work vehicle according to claim 1 or claim 2, wherein a battery (140) for temporarily storing electricity generated from a fuel cell (110) is positioned above the electric motor (130), and is positioned alongside the fuel cell (110) at a location along the inner surface line (181) of the exterior hood (180).

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