Dump truck

Abstract

To suppress the deterioration of the front-rear weight balance when a vehicle is empty.SOLUTION: A work vehicle includes a fuel cell, a fuel cell DCDC converter that adjusts the voltage output by the fuel cell, a battery, a battery DCDC converter that adjusts the voltage output by the battery, and a vehicle body that supports the fuel cell, the DCDC converter for the fuel cell, the battery, and the DCDC converter for the battery, and the fuel cell is arranged in front of the vehicle body from the DCDC converter for the fuel cell, the battery, and the DCDC converter for the battery.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a work vehicle. [Background technology]

[0002] Patent Document 1 discloses a work vehicle equipped with a driver's cab mounted on the chassis, a work implement mounted on the chassis, an electric motor for driving the work implement, and a fuel cell unit for generating power for driving the electric motor. In Patent Document 1, the fuel cell unit is mounted on the chassis behind the driver's cab and in the center of the vehicle in the longitudinal direction. The fuel cell unit includes a fuel cell that generates power from a supply of hydrogen and air, a blower that supplies air to the fuel cell, and a hydrogen tank that stores hydrogen to be supplied to the fuel cell. A DC-DC converter is disposed on one side of the fuel cell in the vehicle width direction, and a blower is disposed on the other side. Patent Document 2 discloses a fuel cell vehicle equipped with a fuel cell stack, a hydrogen tank, and a secondary battery mounted on a vehicle frame. In Patent Document 2, the fuel cell stack, hydrogen tank, and secondary battery are arranged in this order from the front of the vehicle body. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2017-128202 [Patent Document 2] JP 2019-147500 A Summary of the Invention [Problem to be solved by the invention]

[0004] Vehicles equipped with fuel cells (hereinafter also referred to as "FC vehicles") are equipped with significantly different equipment than vehicles equipped with conventional engines (hereinafter also referred to as "engine vehicles"). For example, because engine vehicles use diesel fuel, the fuel tank is heavy when full. In contrast, because FC vehicles use hydrogen as fuel, the hydrogen tank weighs lighter when full. Furthermore, FC vehicles must be equipped with a large number of heavy batteries and DC-DC converters, which are not necessary in engine vehicles. Because the equipment equipped in FC vehicles is significantly different from that of conventional engine vehicles, the weight of each device also differs significantly. Therefore, depending on the location of the equipment, the front-to-rear weight balance of the vehicle when empty (when no cargo is loaded) may be poor, which may result in poor climbing performance on soft roads, such as during rainy weather. For example, if the vehicle is front-heavy (excessive front weight when empty), the traction of the rear drive wheels is likely to decrease. Therefore, there is room for improvement in preventing the deterioration of the front-to-rear weight balance when the vehicle is empty.

[0005] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a work vehicle that can prevent deterioration of the front-rear weight balance when the vehicle is empty. [Means for solving the problem]

[0006] According to one aspect of the present invention Dump truck a fuel cell, a DC-DC converter for the fuel cell that adjusts the voltage output by the fuel cell, and a battery; A DC-DC converter for a fuel cell is provided separately from the DC-DC converter. The vehicle comprises a battery DCDC converter that adjusts the voltage output by the battery, and a vehicle body that supports the fuel cell, the fuel cell DCDC converter, the battery, and the battery DCDC converter, and the fuel cell is arranged forward of the fuel cell DCDC converter, the battery, and the battery DCDC converter. [Effects of the Invention]

[0007] According to the above aspect, deterioration of the front-rear weight balance when the vehicle is empty can be suppressed. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a perspective view of a work vehicle according to an embodiment. [Figure 2] FIG. 1 is a side view of a work vehicle according to an embodiment. [Figure 3] FIG. 1 is a top view of a work vehicle according to an embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the embodiment, a dump truck, which is a transport vehicle that travels through a work site such as a mine to transport loads, will be described as an example of a work vehicle. For example, the dump truck may be an unmanned dump truck that is driven without being operated by a driver, or a manned dump truck that is driven based on operation by a driver.

[0010] <Dump truck> As shown in FIG. 1, the dump truck 1 includes a vessel 2 (dump body), a vehicle body 3, and a traveling device 4. Hereinafter, the forward direction (front of the vehicle body), backward direction (rear of the vehicle body), and vehicle width direction (left-right direction of the vehicle body) of the dump truck 1 will be referred to as the "front of the vehicle (one side in the front-rear direction of the vehicle)," the "rear of the vehicle (the other side in the front-rear direction of the vehicle)," and the "vehicle width direction." The vehicle width direction may also be referred to as the "left side (one side in the vehicle width direction)" or the "right side (the other side in the vehicle width direction)." The right side of the forward direction of the dump truck 1 will be referred to as the right side, and the left side of the forward direction of the dump truck 1 will be referred to as the left side. The vehicle up-down direction (vertical direction of the vehicle body), the upper side of the vehicle (upper side of the vehicle body), and the lower side of the vehicle (lower side of the vehicle body) will be referred to simply as the "up-down direction," "upper," and "lower." In the illustrated example, the dump truck 1 is placed on a horizontal plane. The vehicle up-down direction (vehicle body up-down direction), vehicle top (vehicle body top) and vehicle bottom (vehicle body bottom) of the dump truck 1 correspond to the up-down direction (vertical direction), vertical top and vertical bottom when the dump truck 1 is placed on a horizontal plane.

[0011] The vessel 2 is a member on which a load is loaded. At least a portion of the vessel 2 is disposed above the vehicle body 3. The vessel 2 is capable of performing a dumping operation and a lowering operation.

[0012] Here, the dumping operation refers to an operation of moving the vessel 2 away from the vehicle body 3 and tilting it in the dumping direction. The dumping direction is toward the rear of the vehicle body 3. In the embodiment, the dumping operation includes lifting the front end of the vessel 2 and tilting the vessel 2 rearward. Due to the dumping operation, the loading surface of the vessel 2 tilts downward toward the rear.

[0013] The lowering operation refers to an operation of bringing the vessel 2 closer to the vehicle body 3. The lowering operation is an operation in the opposite direction to the dumping operation. In the embodiment, the lowering operation includes lowering the front end of the vessel 2.

[0014] The vessel 2 is adjusted to a dump position and a loaded position by the dumping operation and the lowering operation. Here, the dump position means a position in which the vessel 2 is raised. The loaded position means a position in which the vessel 2 is lowered. The example in the figure shows the vessel 2 in the loaded position.

[0015] For example, when earth removal work is performed, the vessel 2 performs a dumping operation to change from a loaded posture to a dump posture. When a load is loaded on the vessel 2, the load is discharged rearward from the rear end of the vessel 2 by the dumping operation. On the other hand, when loading work is performed, the vessel 2 is adjusted to the loaded posture.

[0016] The vessel 2 is equipped with a protector 5 that protects the cab 6 from above. The protector 5 is arranged to cover the cab 6 from above when the vessel 2 is in the loaded position. The protector 5 is provided on the front end side of the vessel 2. The protector 5 is arranged higher than the cab 6. The protector 5 extends in the vehicle width direction. The cab 6 is arranged to the left of the center of the vehicle width direction.

[0017] The cab 6 is supported by a platform 7. The platform 7 is provided to ensure a foothold when the operator gets in and out of the cab 6. The platform 7 is also provided to ensure a foothold when maintenance is performed on equipment mounted on the dump truck 1. For example, a resistor (not shown) may be disposed on the platform 7. The platform 7 is disposed below the protector 5. The platform 7 is disposed above the wheels 11, 12. The platform 7 extends in the vehicle width direction. The platform 7 is formed in a plate shape that is parallel to the vehicle front-rear direction and the vehicle width direction.

[0018] As shown in Fig. 3, the vehicle body 3 includes a vehicle body frame 10. The vehicle body frame 10 extends in the front-rear direction of the vehicle. As shown in Fig. 1, the vehicle body 3 supports the vessel 2. The vehicle body 3 is supported by a traveling device 4.

[0019] The traveling device 4 supports the vehicle body 3. The traveling device 4 causes the dump truck 1 to travel. The traveling device 4 causes the dump truck 1 to move forward or backward. At least a portion of the traveling device 4 is arranged below the vehicle body 3. The traveling device 4 is equipped with a plurality of wheels 11, 12. The plurality of wheels 11, 12 includes a front wheel 11 and a rear wheel 12 arranged rearward of the front wheel 11.

[0020] The front wheels 11 are steered wheels that are steered to change the traveling direction of the dump truck 1. A pair of front wheels 11 is arranged on the left and right. As shown in FIG. 3, the pair of left and right front wheels 11 are arranged with a gap in the vehicle width direction via the front part of the body frame 10. One front wheel 11 is provided on each side (two in total).

[0021] The rear wheels 12 are drive wheels driven by a travel drive motor (not shown). A pair of rear wheels 12 is arranged on the left and right. The pair of left and right rear wheels 12 are arranged at a distance in the vehicle width direction via the rear part of the body frame 10. There are two rear wheels 12 on each side (four in total).

[0022] The dump truck 1 is equipped with a hydraulic oil tank 13 that stores hydraulic oil. In top view of FIG. 3, the hydraulic oil tank 13 has a circular shape. The hydraulic oil tank 13 is supported on the vehicle body frame 10 via a first bracket 15. The hydraulic oil tank 13 is connected to a hydraulic pump (not shown).

[0023] <Fuel cell system> As shown in Fig. 2, the fuel cell system 20 is mounted on a dump truck 1. In the example of Fig. 2, the components of the fuel cell system 20 are indicated by two-dot chain lines. The fuel cell system 20 includes a fuel cell 21, a fuel cell DCDC converter 22, a battery 23, a battery DCDC converter 24, a cooling device 25, and a hydrogen tank 26. The fuel cell 21, the fuel cell DCDC converter 22, the battery 23, the battery DCDC converter 24, the cooling device 25, and the hydrogen tank 26 are supported by the vehicle body 3.

[0024] The fuel cell 21 generates electricity by chemically reacting hydrogen, which is a fuel gas, with oxygen, which is an oxidizing gas. The fuel cell 21 has a stack structure in which a plurality of unit cells are stacked. When viewed from the side in FIG. 2, the fuel cell 21 has a rectangular outer shape. For example, the fuel cell 21 generates electricity by using oxygen contained in the outside air. Note that the fuel cell 21 may be supplied with air containing oxygen by an oxidizing gas supply device (not shown).

[0025] The fuel cell DC-DC converter 22 adjusts the voltage output by the fuel cell 21. The fuel cell DC-DC converter 22 is electrically connected to the fuel cell 21. In the side view of FIG. 2, the fuel cell DC-DC converter 22 has a rectangular outer shape. For example, the fuel cell DC-DC converter 22 boosts the voltage generated by the fuel cell 21. The fuel cell DC-DC converter 22 supplies the direct current generated by the fuel cell 21 to a motor inverter (not shown).

[0026] The motor inverter converts the DC current from the fuel cell DC-DC converter 22 into three-phase AC current and supplies it to each motor (for example, a pump drive motor and a travel drive motor, not shown). Each of the pump drive motor and the travel drive motor is driven based on the three-phase AC current supplied from the motor inverter.

[0027] The pump drive motor drives a hydraulic pump (not shown). The hydraulic oil discharged from the hydraulic pump is supplied to a steering cylinder (not shown) and a hoist cylinder (not shown). The steering cylinder generates power to steer the front wheels 11. The hoist cylinder generates power to perform dumping or lowering operations on the vessel 2. The travel drive motor is connected to the rear wheels 12 of the travel device 4. The rotational force generated by the travel drive motor is transmitted to the rear wheels 12 of the travel device 4.

[0028] The battery 23 stores the power generated in the fuel cell 21. Like the fuel cell 21, the battery 23 functions as a power source for the dump truck 1. The battery 23 supplies the stored power to each motor (e.g., the pump drive motor and the travel drive motor). For example, the battery 23 is a secondary battery such as a lithium-ion battery. The battery 23 is supported on the body frame 10 via the second bracket 16. For example, the battery 23 is heavier than the fuel cell 21. In a side view of FIG. 2 , the battery 23 has a rectangular outer shape that is longer in the vertical direction than the fuel cell 21.

[0029] For example, the battery 23 drives the travel drive motor when the dump truck 1 starts under the control of a control device (not shown). For example, the battery 23 stores regenerated power when the dump truck 1 decelerates and regenerates. For example, the battery 23 is charged by power supplied from the fuel cell 21 depending on the load.

[0030] The battery DCDC converter 24 adjusts the voltage output by the battery 23. The battery DCDC converter 24 is electrically connected to the battery 23. In the side view of FIG. 2, the battery DCDC converter 24 has a rectangular outer shape. For example, the battery DCDC converter 24 boosts the voltage of the battery 23. The battery DCDC converter 24 controls the charging and discharging of the battery 23 so that the battery 23 can be integrated with the fuel cell 21 to supply power to the motor inverter.

[0031] For example, the battery 23 may be the main power source of the dump truck 1, and the fuel cell 21 may function to charge the battery 23. This makes it possible to reduce the amount of fuel cell 21 that can be installed. In addition, reducing the amount of fuel cell 21 that can be installed makes it easier to control the fuel cell 21.

[0032] The cooling device 25 cools the fuel cell 21. For example, the cooling device 25 supplies a refrigerant (e.g., cooling water) to the fuel cell 21 in order to cool the fuel cell 21. The cooling device 25 is connected to the fuel cell 21 via a cooling pipe 27 through which the refrigerant passes. In the side view of FIG. 2, the cooling device 25 has a rectangular shape that is longer in the vertical direction than the fuel cell 21. For example, the cooling device 25 may include a blower that supplies oxygen from the air to the fuel cell 21.

[0033] The hydrogen tank 26 stores hydrogen to be supplied to the fuel cell 21. In side view in Figure 2, the hydrogen tank 26 has a rectangular shape with its longitudinal axis in the front-to-rear direction. For example, the fuel cell 21 is supplied with hydrogen from the hydrogen tank 26 by a hydrogen supply device (not shown). The fuel cell 21 generates electricity by causing an electrochemical reaction between the hydrogen supplied from the hydrogen supply device and oxygen contained in the outside air.

[0034] <Layout of components of fuel cell system> The cooling device 25 is arranged at the frontmost position of the vehicle body among the components of the fuel cell system 20 because it needs to take in outside air. The cooling device 25 is arranged further forward in the vehicle body than the fuel cell 21. The cooling device 25 is arranged near the fuel cell 21. The cooling pipes 27 extend from the rear of the cooling device 25 toward the fuel cell 21. At least a portion of the vertical range of the cooling device 25 is arranged below the platform 7.

[0035] The fuel cell 21 is disposed further forward on the vehicle body than the fuel cell DCDC converter 22, the battery 23, and the battery DCDC converter 24. The fuel cell DCDC converter 22, the battery 23, and the battery DCDC converter 24 are disposed in the center and rear of the vehicle body. The cooling device 25, fuel cell 21, fuel cell DCDC converter 22, battery 23, and battery DCDC converter 24 are disposed in this order from the front to the rear of the vehicle body.

[0036] 3, the cooling device 25, the fuel cell 21, the fuel cell DC-DC converter 22, and the battery DC-DC converter 24 are arranged on the vehicle body's left-right center line CL. For example, the cooling device 25, the fuel cell 21, the fuel cell DC-DC converter 22, and the battery DC-DC converter 24 are preferably arranged so that their respective centers of gravity overlap with the vehicle body's left-right center line CL. This improves the weight balance in the vehicle's width direction.

[0037] 3, the vessel 2, the hydrogen tank 26, etc. are not shown. As shown in FIG. 2, the hydrogen tank 26 is mounted on the platform 7. The hydrogen tank 26 is located on the upper surface of the platform 7 to the right of the operator's cab 6 (see FIG. 1). The hydrogen tank 26 is located between the platform 7 and the protector 5.

[0038] In a top view of FIG. 3, the battery 23 and the hydraulic oil tank 13 are disposed on opposite sides of each other in the left-right direction of the vehicle body. In this embodiment, the hydraulic oil tank 13 is disposed to the left of the vehicle body left-right center line CL. On the other hand, the battery 23 is disposed to the right of the vehicle body left-right center line CL. In a top view, the battery 23 is disposed between the right front wheel 11 and the right rear wheel 12. In a side view of FIG. 2, the battery 23 is disposed in a space surrounded by the right front wheel 11, the right rear wheel 12, and the lower right part of the vessel 2.

[0039] In the top view of FIG. 3, the cooling device 25 has an axisymmetric shape with the vehicle body left-right center line CL as the axis of symmetry. In the top view of FIG. 3, the cooling device 25 has a rectangular shape with its longitudinal axis in the vehicle width direction. The length of the cooling device 25 in the vehicle width direction is longer than the length of the fuel cell 21 in the vehicle width direction. The fuel cell 21, the fuel cell DCDC converter 22, and the battery DCDC converter 24 have approximately the same lengths in the vehicle width direction. In the top view of FIG. 3, the fuel cell 21, the fuel cell DCDC converter 22, and the battery DCDC converter 24 are each rectangular. The fuel cell 21, the fuel cell DCDC converter 22, and the battery DCDC converter 24 are arranged within the range of the cooling device 25 in the vehicle width direction.

[0040] The fuel cell 21, the fuel cell DCDC converter 22, and the battery DCDC converter 24 are mounted on the body frame 10. The fuel cell 21, the fuel cell DCDC converter 22, and the battery DCDC converter 24 are arranged within the vehicle width direction range of the body frame 10. As a result, the fuel cell 21, the fuel cell DCDC converter 22, and the battery DCDC converter 24 are covered from below the vehicle body by the body frame 10. Therefore, it is possible to prevent external disturbances (e.g., flying stones) from affecting the fuel cell 21, the fuel cell DCDC converter 22, and the battery DCDC converter 24 from below the vehicle body.

[0041] As shown in Fig. 2, the cooling device 25, fuel cell 21, fuel cell DCDC converter 22, and battery 23 are arranged below the platform 7. In the side view of Fig. 2, the fuel cell 21 and fuel cell DCDC converter 22 overlap the front wheels 11. In the side view of Fig. 2, the fuel cell 21 overlaps the front upper part of the front wheels 11. In the side view of Fig. 2, the fuel cell DCDC converter 22 overlaps the rear upper part of the front wheels 11. For example, in the side view of Fig. 2, it is preferable that the fuel cell 21 and fuel cell DCDC converter 22 are arranged within the range of the front wheels 11 in the vehicle fore-and-aft direction.

[0042] 2, it is more preferable that the entire fuel cell 21 and the fuel cell DC-DC converter 22 are disposed radially inward of the outer periphery of the front wheel 11. This allows the fuel cell 21 and the fuel cell DC-DC converter 22 to be covered by the front wheel 11 from the outside in the vehicle width direction, thereby preventing external disturbances (e.g., flying stones) from reaching the fuel cell 21 and the fuel cell DC-DC converter 22 from the outside in the vehicle width direction.

[0043] As shown in Fig. 2, the battery 23 is disposed between the vessel 2 and the second bracket 16. In a top view of Fig. 3, the battery 23 has a rectangular shape that is longer in the vehicle width direction than the fuel cell 21. In a top view of Fig. 3, the battery 23 is disposed more inward in the vehicle width direction than the right end of the right front wheel 11. In a top view of Fig. 3, the battery 23 is disposed more inward in the vehicle width direction than the right end of the right rear wheel 12 (specifically, the right end of the right rear wheel 12 that is the outer one of the pair of right rear wheels 12 in the vehicle width direction).

[0044] For example, in a top view, the battery 23 is preferably disposed within the range in the vehicle width direction of the vessel 2. For example, in a top view, it is more preferable that the entire battery 23 is disposed inward in the vehicle width direction from the outer end in the vehicle width direction of the vessel 2. This allows the battery 23 to be covered by the vessel 2 from above the vehicle, and therefore it is possible to prevent external disturbances (for example, rainwater, etc.) from reaching the battery 23 from above the vehicle.

[0045] As shown in Fig. 2, the battery DC-DC converter 24 is disposed between the vessel 2 and the body frame 10. In the side view of Fig. 2, the battery DC-DC converter 24 overlaps with the upper part of the rear wheel 12. For example, in the side view of Fig. 2, the battery DC-DC converter 24 is preferably disposed within the range of the rear wheel 12 in the front-to-rear direction of the vehicle.

[0046] 2, it is preferable that the entire battery DC-DC converter 24 is disposed radially inward of the outer circumferential edge of the rear wheel 12. This allows the battery DC-DC converter 24 to be covered by the rear wheel 12 from the outer side in the vehicle width direction, thereby preventing external disturbances (e.g., flying stones) from reaching the battery DC-DC converter 24 from the outer side in the vehicle width direction.

[0047] <Action and effect> As described above, the dump truck 1 of this embodiment includes the fuel cell 21, the fuel cell DCDC converter 22 that adjusts the voltage output by the fuel cell 21, the battery 23, the battery DCDC converter 24 that adjusts the voltage output by the battery 23, and the vehicle body 3 that supports the fuel cell 21, the fuel cell DCDC converter 22, the battery 23, and the battery DCDC converter 24. The fuel cell 21 is disposed further forward in the vehicle body than the fuel cell DCDC converter 22, the battery 23, and the battery DCDC converter 24. According to this configuration, since the fuel cell 21 is disposed further forward in the vehicle body than the fuel cell DC-DC converter 22, the battery 23, and the battery DC-DC converter 24, it is possible to prevent the vehicle from becoming front-heavy (excessive front weight when the vehicle is empty) compared to when the heavy battery 23 is disposed further forward in the vehicle body than the fuel cell 21. Therefore, it is possible to prevent deterioration of the front-to-rear weight balance when the vehicle is empty. In addition, by reducing the front-heavy load, it is possible to prevent a decrease in traction of the rear wheels 12, which are the driving wheels, and therefore to prevent a deterioration in climbing performance on soft road surfaces, such as during rainy weather.

[0048] In this embodiment, the fuel cell DC-DC converter 22, the battery 23, and the battery DC-DC converter 24 are arranged in the center and rear of the vehicle body. This configuration can prevent the vehicle from becoming front-heavy compared to when the heavy battery 23 and the DC-DC converter are located at the front of the vehicle body, and therefore can more effectively prevent deterioration of the front-to-rear weight balance when the vehicle is empty.

[0049] In this embodiment, the dump truck 1 further includes a cooling device 25 that cools the fuel cell 21. The cooling device 25 is disposed further forward than the fuel cell 21 on the vehicle body. According to this configuration, it is easier for the cooling device 25 to take in outside air compared to when the cooling device 25 is disposed further rearward on the vehicle body than the fuel cell 21. For example, when the dump truck 1 moves forward, outside air (for example, traveling wind) from the front of the vehicle can be directly taken in by the cooling device 25.

[0050] In this embodiment, the cooling device 25 is disposed near the fuel cell 21. This configuration makes it possible to shorten as much as possible the length of the piping connecting the cooling device 25 and the fuel cell 21. For example, when the cooling device 25 is connected to the fuel cell 21 via the cooling piping 27, the length of the cooling piping 27 can be shortened as much as possible by extending the cooling piping 27 from the rear of the cooling device 25 toward the fuel cell 21. In addition, the shortened length of the cooling pipes 27 makes it easier to mount the cooling pipes 27 on the vehicle body 3. In addition, the shortened length of the cooling pipes 27 makes it possible to reduce the weight of the cooling pipes 27. In addition, the shortened length of the cooling pipes 27 reduces the amount of refrigerant passing through the cooling pipes 27, making it possible to reduce maintenance costs.

[0051] In this embodiment, the cooling device 25, fuel cell 21, fuel cell DC-DC converter 22, battery 23, and battery DC-DC converter 24 are arranged in this order from the front to the rear of the vehicle body. According to this configuration, the heavy battery 23 and the DC-DC converter are disposed further rearward than the cooling device 25 and the fuel cell 21, preventing the vehicle from becoming front-heavy. Therefore, deterioration of the front-to-rear weight balance when the vehicle is empty can be more effectively prevented.

[0052] In this embodiment, the dump truck 1 further includes a hydrogen tank 26 that stores hydrogen to be supplied to the fuel cell 21, a protector 5 that protects the driver's cab 6 from above the vehicle body, and a platform 7 that is located below the protector 5 on the vehicle body. The hydrogen tank 26 is mounted on the platform 7. According to this configuration, a large number of hydrogen tanks 26 can be mounted by utilizing the vehicle height direction up to the vicinity of the protector 5. In addition, mounting the lightweight hydrogen tanks 26 on the platform 7 reduces the required strength of the platform 7 compared to mounting the heavy battery 23 and DC-DC converter on the platform 7. In addition, because there are few obstructions above the platform 7, the risk of hydrogen accumulating due to obstructions when releasing hydrogen from the hydrogen tanks 26 can be reduced.

[0053] In this embodiment, the dump truck 1 further includes a hydraulic oil tank 13 that stores hydraulic oil. The battery 23 and the hydraulic oil tank 13 are disposed on opposite sides to each other in the left-right direction of the vehicle body. According to this configuration, deterioration of the left-right weight balance when the vehicle is empty can be suppressed compared to when the battery 23 and the hydraulic oil tank 13 are arranged on the same side in the left-right direction of the vehicle body.

[0054] <Other embodiments> In the above-described embodiment, an example has been described in which the fuel cell DC-DC converter, the battery, and the battery DC-DC converter are arranged in the center and rear of the vehicle body, but this is not limiting. For example, the battery and the DC-DC converter may be arranged in the front of the vehicle body. For example, the arrangement of the fuel cell DC-DC converter, the battery, and the battery DC-DC converter can be changed depending on the required specifications.

[0055] In the above-described embodiment, an example has been described in which the dump truck further includes a cooling device that cools the fuel cell, and the cooling device is disposed further forward on the vehicle body than the fuel cell, but this is not limited thereto. For example, the cooling device may be disposed further rearward on the vehicle body than the fuel cell. For example, the dump truck may not include a cooling device. For example, the arrangement of the cooling device may be changed depending on required specifications.

[0056] In the above-described embodiment, an example has been described in which the cooling device is disposed near the fuel cell, but this is not limiting. For example, the cooling device does not have to be disposed near the fuel cell. For example, the cooling device may be disposed closer to the battery than the fuel cell. For example, the arrangement of the cooling device and the fuel cell (the distance between the cooling device and the fuel cell) can be changed according to the required specifications.

[0057] In the above-described embodiment, an example has been described in which the cooling device, fuel cell, fuel cell DCDC converter, battery, and battery DCDC converter are arranged in this order from the front to the rear of the vehicle body, but this is not limited to this. For example, the components do not have to be arranged in the order of the cooling device, fuel cell, fuel cell DCDC converter, battery, and battery DCDC converter from the front to the rear of the vehicle body. For example, the arrangement order of the fuel cell DCDC converter, battery, and battery DCDC converter may be reversed. For example, the arrangement of the cooling device, fuel cell, fuel cell DCDC converter, battery, and battery DCDC converter can be changed depending on the required specifications.

[0058] In the above-described embodiment, the dump truck further includes a hydrogen tank that stores hydrogen to be supplied to the fuel cell, a protector that protects the driver's cab from above the vehicle body, and a platform that is located below the protector on the vehicle body, and the hydrogen tank is mounted on the platform. However, this is not limiting. For example, the hydrogen tank does not have to be mounted on the platform. For example, the hydrogen tank may be mounted below the platform. For example, the hydrogen tank may be mounted on the vehicle body frame. For example, the mounting configuration of the hydrogen tank can be changed depending on required specifications.

[0059] In the above-described embodiment, the dump truck further includes a hydraulic tank for storing hydraulic oil, and the battery and the hydraulic tank are disposed on opposite sides of the vehicle body in the left-right direction. However, this is not limiting. For example, the battery and the hydraulic tank may be disposed on the same side of the vehicle body in the left-right direction. For example, the arrangement of the battery and the hydraulic tank may be changed depending on the required specifications.

[0060] In the above-described embodiment, a dump truck has been described as an example of a work machine (work vehicle), but the present invention is not limited to this. For example, the present invention may be applied to other work vehicles such as an excavator, a bulldozer, a wheel loader, etc.

[0061] Although the embodiments of the present invention have been described above, the present invention is not limited to these, and additions, omissions, substitutions, and other modifications to the configuration are possible within the scope of the spirit of the present invention, and the above-described embodiments can also be combined as appropriate. [Explanation of symbols]

[0062] 1...Dump truck (work vehicle), 3...Vehicle body, 5...Protector, 7...Platform, 13...Hydraulic oil tank, 21...Fuel cell, 22...DCDC converter for fuel cell, 23...Battery, 24...DCDC converter for battery, 25...Cooling device, 26...Hydrogen tank

Claims

1. A fuel cell; a DC-DC converter for a fuel cell that adjusts the voltage output by the fuel cell; A battery, a battery DC-DC converter that is provided separately from the fuel cell DC-DC converter and adjusts the voltage output by the battery; a vehicle body supporting the fuel cell, the fuel cell DC-DC converter, the battery, and the battery DC-DC converter, The fuel cell is disposed forward of the fuel cell DC-DC converter, the battery, and the battery DC-DC converter on the vehicle body. Dump truck.

2. The fuel cell DC-DC converter, the battery, and the battery DC-DC converter are disposed at the center and rear of the vehicle body. The dump truck according to claim 1 .

3. a cooling device for cooling the fuel cell; The cooling device is disposed forward of the fuel cell on the vehicle body. The dump truck according to claim 1 or 2.

4. The cooling device is disposed near the fuel cell. The dump truck according to claim 3.

5. The cooling device, the fuel cell, the fuel cell DCDC converter, the battery, and the battery DCDC converter are arranged in this order from the front to the rear of the vehicle body. The dump truck according to claim 4.

6. a hydrogen tank for storing hydrogen to be supplied to the fuel cell; A protector that protects the driver's cab from above the vehicle body; a platform disposed below the protector on the vehicle body, The hydrogen tank is mounted on the platform. The dump truck according to any one of claims 1 to 5.

7. Further provided with a hydraulic oil tank for storing hydraulic oil, The battery and the hydraulic oil tank are disposed on opposite sides of each other in the left-right direction of the vehicle body. The dump truck according to any one of claims 1 to 6.

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