Dumper

Abstract

This dump truck is provided with: a vehicle body frame on which a drive source using hydrogen as fuel is mounted; the vehicle body frame is provided with hydrogen, the unloading vehicle body is freely combined with the vehicle body frame in a rotating mode through a rotating part and carries loaded objects, the hydrogen tank is used for storing the hydrogen, and the hydrogen tank is arranged on the unloading vehicle body.

Description

Technical Field

[0001] The present invention relates to a dump truck.

[0002] The present invention claims priority based on Japanese Patent Application No. 2022-181817 filed on November 14, 2022, and incorporates its content herein. Background Art

[0003] Towards carbon neutrality, zero-emission of mining machinery and construction machinery is an urgent task. As one of the means to achieve zero-emission, there is a fuel cell system. For example, a fuel cell system includes a fuel cell (FC: Fuel Cell), a storage battery, and a hydrogen tank for storing hydrogen as fuel. Hydrogen as fuel has a lower volumetric energy density compared to other fuels such as light oil. For example, even if high-pressure hydrogen (about 70 MPa) is stored in the volume of the current light oil tank, the onboard energy is less than one-tenth of that in the case of light oil. In other words, when hydrogen is used as fuel, it means a shorter operation time compared to when light oil is used as fuel.

[0004] For example, Patent Document 1 discloses a fuel cell vehicle including a fuel cell stack, a first hydrogen tank, and a second hydrogen tank that supply hydrogen to the fuel cell stack. The first hydrogen tank is disposed below the passage portion of the front floor. The second hydrogen tank is disposed below the rear floor. The first hydrogen tank and the second hydrogen tank are provided in the lower part of the vehicle body (the lower side of the vehicle).

[0005] Prior Art Documents

[0006] Patent Documents

[0007] Patent Document 1: Japanese Unexamined Patent Application Publication No. 2019-189028 Summary of the Invention

[0008] Problems to be Solved by the Invention

[0009] However, the space in the lower part of the vehicle body is limited, and it is difficult to mount a large number of the first hydrogen tank and the second hydrogen tank. Therefore, there is room for improvement in mounting a large number of hydrogen tanks storing hydrogen with a low volumetric energy density in the limited space of the vehicle.

[0010] Therefore, an object of the present invention is to provide a dump truck capable of mounting a large amount of hydrogen as fuel.

[0011] Means for Solving the Problems

[0012] A dump truck according to an aspect of the present invention includes: a body frame on which a drive source using hydrogen as fuel is mounted; and a dump body that is rotatably coupled to the body frame through a rotating portion and mounts a load, and further includes a hydrogen tank for storing the hydrogen, and the hydrogen tank is provided in the dump body.

[0013] Advantages of the Invention

[0014] According to the above method, a large amount of hydrogen as fuel can be carried. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a side view of the dump truck of the embodiment.

[0016] Figure 2 It is a side view when discharging the loaded material in the dump truck of the embodiment.

[0017] Figure 3 It is a front view of the dump truck of the embodiment.

[0018] Figure 4 It is a block diagram of the hydrogen supply system of the embodiment. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the embodiments, as the work vehicle constituting the hydrogen supply system, a dump truck, which is a transport vehicle that travels at a work site such as a mine to transport goods, will be described as an example.

[0020] <Dump Truck>

[0021] Figure 1 It is a side view of the dump truck 2 of the embodiment. Figure 2 It is a side view when discharging the loaded material in the dump truck 2 of the embodiment. Figure 3 It is a front view of the dump truck 2 of the embodiment. Figure 4 It is a block diagram of the hydrogen supply system 1 of the embodiment.

[0022] Refer to together Figures 1 to 4 , The dump truck 2 includes: a body frame 10 equipped with a drive source 36 using hydrogen as fuel, a discharge body 12 (equivalent to a dump body) that is rotatably coupled to the body frame 10 through a rotating portion 11 and carries the loaded material, and a traveling device 13 that supports the body frame 10. For example, the dump truck 2 can be an unmanned dump truck that is driverless without relying on the driver's driving operation, or a manned dump truck that is driven based on the driver's driving operation.

[0023] Hereinafter, the forward direction (front of the vehicle body), reverse direction (rear of the vehicle body), and vehicle width direction (left and right of the vehicle body) of the dump truck 2 are referred to as "front of the vehicle (one side of the vehicle front-rear direction)", "rear of the vehicle (the other side of the vehicle front-rear direction)", and "vehicle width direction", respectively. The vehicle width direction is sometimes also referred to as "left side (one side of the vehicle width direction)" or "right side (the other side of the vehicle width direction)". The right hand is referred to as the right side with respect to the direction in which the dump truck 2 advances, and the left hand is referred to as the left side with respect to the advancing direction of the dump truck 2. The vehicle up-down direction (up-down direction of the vehicle body), vehicle upper side (upper side of the vehicle body), and vehicle lower side (lower side of the vehicle body) of the dump truck 2 are simply referred to as "up-down direction", "upper side", and "lower side", respectively. In the example of the figure, the dump truck 2 is disposed on a horizontal plane (horizontal ground). The vehicle up-down direction (up-down direction of the vehicle body), vehicle upper side (upper side of the vehicle body), and vehicle lower side (lower side of the vehicle body) of the dump truck 2 coincide with the up-down direction (vertical direction), vertical upper side, and vertical lower side, respectively, in the state where the dump truck 2 is disposed on the horizontal plane.

[0024] The body frame 10 extends in the vehicle front-rear direction. The body frame 10 supports the unloading vehicle body 12 via a rotating portion 11 so as to be rotatable. The rotating portion 11 is a portion including a shaft portion (corresponding to the rotation center axis of the unloading vehicle body 12) extending in the vehicle width direction on the body frame 10. The body frame 10 is supported by the traveling device 13.

[0025] The unloading vehicle body 12 is rotatably coupled to the body frame 10 via the rotating portion 11. The unloading vehicle body 12 is a member for loading goods (corresponding to a carriage). At least a part of the unloading vehicle body 12 is disposed at a position higher than the body frame 10. The unloading vehicle body 12 can perform an unloading operation and a lowering operation.

[0026] The unloading operation is an operation of separating the unloading vehicle body 12 from the body frame 10 and tilting it in the unloading direction. The unloading direction is the rear of the body frame 10. In the embodiment, the unloading operation includes raising the front end portion of the unloading vehicle body 12 and tilting the unloading vehicle body 12 backward. By the unloading operation, the loading surface of the unloading vehicle body 12 faces backward and tilts downward.

[0027] The lowering operation is an operation of bringing the unloading vehicle body 12 closer to the body frame 10. The lowering operation is an operation in the opposite direction to the unloading operation. In the embodiment, the lowering operation includes lowering the front end portion of the unloading vehicle body 12.

[0028] By the unloading operation and the lowering operation, the unloading vehicle body 12 is adjusted to an unloading posture and a loading posture. The unloading posture is a posture in which the unloading vehicle body 12 is raised. The loading posture is a posture in which the unloading vehicle body 12 is lowered. In Figure 2 the example, the unloading vehicle body 12 in the loading posture is represented by a solid line, and the unloading vehicle body 12 in the unloading posture is represented by a double-dot chain line.

[0029] For example, in the case of carrying out the dumping operation, the unloading vehicle body 12 performs a dumping action in such a manner that it changes from the loading posture to the unloading posture. When the unloading vehicle body 12 is loaded with goods, the goods are discharged rearward from the rear end portion of the unloading vehicle body 12 by the dumping action. On the other hand, in the case of carrying out the loading operation, the unloading vehicle body 12 is adjusted to the loading posture.

[0030] The unloading vehicle body 12 is provided with a protection device 16 that protects the cab 15 from above. The protection device 16 is arranged to cover the cab 15 from above when the unloading vehicle body 12 is in the loading posture. The protection device 16 is provided on the front end side of the unloading vehicle body 12. The protection device 16 is arranged at a position above the cab 15. The protection device 16 extends in the vehicle width direction. For example, the cab 15 is arranged at a position on the left side of the vehicle with respect to the center in the vehicle width direction.

[0031] The cab 15 is supported by a platform 17. The platform 17 is provided to ensure a footrest when the operator gets on and off the cab 15. The platform 17 is provided to ensure a footrest when inspecting the mounted equipment of the dump truck 2. The platform 17 is arranged at a position below the protection device 16. The platform 17 is arranged at a position above the wheels 21, 22. The platform 17 extends in the vehicle width direction. The platform 17 is formed in a plate shape parallel to the vehicle longitudinal direction and the vehicle width direction.

[0032] The traveling device 13 supports the body frame 10. The traveling device 13 enables the dump truck 2 to travel. The traveling device 13 enables the dump truck 2 to move forward or backward. At least a part of the traveling device 13 is arranged at a position below the body frame 10. The traveling device 13 includes a plurality of wheels 21, 22. The plurality of wheels 21, 22 includes front wheels 21 and rear wheels 22 arranged behind the front wheels 21.

[0033] The front wheels 21 are steering wheels that turn to change the traveling direction of the dump truck 2. A pair of left and right front wheels 21 are arranged at intervals in the vehicle width direction via the front portion of the body frame 10. One front wheel 21 is provided on each of the left and right sides (two in total).

[0034] The rear wheels 22 are drive wheels driven by a drive source 36. A pair of left and right rear wheels 22 are arranged at intervals in the vehicle width direction via the rear portion of the body frame 10. Two rear wheels 22 are provided on each of the left and right sides (four in total).

[0035] <Hydrogen tank>

[0036] The dump truck 2 is also equipped with a hydrogen tank 25 for storing hydrogen as fuel. The hydrogen tank 25 is provided on the unloading vehicle body 12. In the present embodiment, the hydrogen tank 25 is provided below the protection device 16. The hydrogen tank 25 has a cylindrical shape. A plurality of hydrogen tanks 25 are provided in the vehicle width direction along the lower surface of the protection device 16. In Figure 3 the example of

[0037] it should be noted that the shape, number, and arrangement of the hydrogen tanks 25 are not limited to the above. For example, the hydrogen tank 25 may also have a flat shape. For example, the number of hydrogen tanks 25 may also be 12 or less or 14 or more. For example, the hydrogen tanks 25 may also be arranged in a stacked manner. For example, two or more layers of hydrogen tanks 25 may be stacked on the lower surface of the protection device 16. For example, the shape, number, and arrangement of the hydrogen tanks 25 can be changed according to the design specifications.

[0038] For example, the hydrogen tank 25 is detachably connected to the lower surface of the protection device 16 by connecting members (not shown) such as U-shaped bands and U-shaped bolts. For example, a plurality of connecting members are provided at positions corresponding to the respective hydrogen tanks 25. For example, the connecting members are configured to connect the hydrogen tanks 25 to the lower surface of the protection device 16 one by one.

[0039] It should be noted that the structure of the connecting members is not limited to the above. For example, only one connecting member may be provided corresponding to the plurality of hydrogen tanks 25. For example, the connecting members may also be configured to collectively connect the plurality of hydrogen tanks 25 to the lower surface of the protection device 16. For example, the configuration method of the connecting members can be changed according to the design specifications.

[0040] <Hydrogen supply system>

[0041] The components of the hydrogen supply system 1 (an example of the system) are mounted on the vehicle body frame 10 and the unloading vehicle body 12.

[0042] A controller 30, a pressure reducing valve 35, a drive source 36 (equivalent to an FC / hydrogen engine), and a hydrogen filling connector 50 are mounted on the vehicle body frame 10.

[0043] A hydrogen tank 25, a hydrogen filling manifold 52, a hydrogen filling pressure sensor 54, a hydrogen supply manifold 56, a solenoid valve 57, a hydrogen discharge pipe 58, and a hydrogen supply pressure sensor 59 are mounted on the unloading vehicle body 12.

[0044] The wiring harness 5 is configured to be able to transmit a control signal from the controller 30 mounted on the vehicle body frame 10 to the unloading vehicle body 12. For example, the wiring harness 5 is composed of a plurality of electric wires (for example, a wire harness).

[0045] One end of the wire harness 5 (the end opposite to the end joined to the side of the unloading vehicle body 12) is connected to the controller 30. For example, the controller 30 includes a processor such as a CPU (i.e., a processing unit), a RAM, a ROM, and a storage unit such as a combination thereof, and an input / output unit. The processing unit controls the operations of the components of the system. The storage unit stores a computer program for implementing the functions of the processing unit and information required for the processing of the processing unit. The input / output unit is an interface circuit between the controller 30 and other devices.

[0046] The hydrogen supply system 1 includes a hydrogen filling system 3 for filling hydrogen as fuel into the hydrogen tank 25 and a hydrogen supply system 4 for supplying the hydrogen in the hydrogen tank 25 to the drive source 36. In the present embodiment, the hydrogen filling system 3 and the hydrogen supply system 4 are configured such that the flow paths of hydrogen are different systems.

[0047] <Hydrogen filling system>

[0048] The hydrogen filling system 3 includes a hydrogen filling pipe 51 and a hydrogen filling manifold 52. The hydrogen filling pipe 51 includes: a first filling portion 51A provided on the vehicle body frame 10, a second filling portion 51B provided on the lower surface of the unloading vehicle body 12, and a third filling portion 51C that is bendable and joins the first filling portion 51A and the second filling portion 51B near the rotating portion 11.

[0049] For example, the first filling portion 51A and the second filling portion 51B are made of metal pipes. For example, the first filling portion 51A and the second filling portion 51B are made of high-pressure metal pipes capable of withstanding high-pressure hydrogen (e.g., about 70 MPa). For example, the third filling portion 51C is made of a hose. For example, the third filling portion 51C is made of a hose capable of withstanding swinging and high-pressure hydrogen (e.g., about 70 MPa).

[0050] A plurality of second filling portions 51B are provided on the unloading vehicle body 12. For example, the hydrogen filling manifold 52 is provided on the left side portion (one side portion in the vehicle width direction) of the unloading vehicle body 12. The hydrogen filling manifold 52 has a structure that branches one pipe (corresponding to the third filling portion 51C) into multiple pipes (corresponding to the plurality of second filling portions 51B corresponding to the plurality of hydrogen tanks 25).

[0051] The hydrogen filling connector 50 is connected to the hydrogen filling manifold 52 via the first filling portion 51A and the third filling portion 51C that constitute the hydrogen filling pipe 51. The hydrogen filling manifold 52 is connected to the hydrogen tank 25 via the second filling portion 51B that constitutes the hydrogen filling pipe 51. Hydrogen is filled into the hydrogen tank 25 through the hydrogen filling connector 50, the first filling portion 51A (corresponding to the metal pipe), the third filling portion 51C (corresponding to the hose), the hydrogen filling manifold 52, and the second filling portion 51B (corresponding to the metal pipe).

[0052] The pressure sensor 54 for hydrogen filling is connected to the manifold 52 for hydrogen filling. The pressure sensor 54 for hydrogen filling measures the pressure inside the manifold 52 for hydrogen filling.

[0053] <Hydrogen supply system>

[0054] The hydrogen supply system 4 includes a hydrogen supply pipe 55 and a manifold 56 for hydrogen supply. The hydrogen supply pipe 55 includes: a first supply portion 55A provided on the lower surface of the unloading vehicle body 12, a second supply portion 55B provided on the vehicle body frame 10, and a bendable third supply portion 55C that joins the first supply portion 55A and the second supply portion 55B near the rotating portion 11.

[0055] For example, the first supply portion 55A and the second supply portion 55B are composed of metal pipes. For example, the first supply portion 55A and the second supply portion 55B are composed of high-pressure metal pipes capable of withstanding high-pressure hydrogen (for example, about 70 MPa). For example, the third supply portion 55C is composed of a hose. For example, the third supply portion 55C is composed of a hose capable of withstanding swinging and high-pressure hydrogen (for example, about 70 MPa).

[0056] A plurality of first supply portions 55A are provided on the unloading vehicle body 12. For example, the manifold 56 for hydrogen supply is provided on the right side portion (the other side portion in the vehicle width direction) of the unloading vehicle body 12. The manifold 56 for hydrogen supply has a structure that combines a plurality of pipes (corresponding to the plurality of first supply portions 55A corresponding to the plurality of hydrogen tanks 25) into one pipe (corresponding to the third supply portion 55C).

[0057] The hydrogen tank 25 is connected to the manifold 56 for hydrogen supply via the first supply portion 55A that constitutes the hydrogen supply pipe 55. The manifold 56 for hydrogen supply is connected to the drive source 36 via the second supply portion 55B and the third supply portion 55C that constitute the hydrogen supply pipe 55, etc. Hydrogen is supplied to the drive source 36 through the hydrogen tank 25, the first supply portion 55A (corresponding to a metal pipe), the manifold 56 for hydrogen supply, the third supply portion 55C (corresponding to a hose), and the second supply portion 55B (corresponding to a metal pipe), etc.

[0058] The hydrogen discharge pipe 58 is branched and provided from the manifold 56 for hydrogen supply. The hydrogen discharge pipe 58 discharges hydrogen after being gasified as fuel. The hydrogen discharge pipe 58 discharges hydrogen from the side surface of the unloading vehicle body 12. The hydrogen discharge pipe 58 is connected to the manifold 56 for hydrogen supply via the electromagnetic valve 57. For example, in an emergency, the hydrogen inside the manifold 56 for hydrogen supply can also be discharged to the outside through the hydrogen discharge pipe 58.

[0059] The pressure sensor 59 for hydrogen supply is connected to the manifold 56 for hydrogen supply. The pressure sensor 59 for hydrogen supply measures the pressure inside the manifold 56 for hydrogen supply.

[0060] The other end of the wire harness 5 (the end branched from the portion on the side opposite to the end coupled to the controller 30) is electrically connected to the hydrogen filling pressure sensor 54, the hydrogen supply pressure sensor 59, and the electromagnetic valve 57. The detection results (pressure detection signals) of the hydrogen filling pressure sensor 54 and the hydrogen supply pressure sensor 59 are input to the controller 30 through the wire harness 5.

[0061] One end of the second supply portion 55B (the end on the side opposite to the end coupled to the third supply portion 55C) is connected to a pressure reducing valve 35 for reducing the pressure of the fuel. The pressure reducing valve 35 is provided between the second supply portion 55B and the drive source 36. The pressure reducing valve 35 is connected to the drive source 36. The pressure reducing valve 35 has a function of releasing the high pressure in the second supply portion 55B (primary side) and maintaining the pressure on the drive source 36 side (secondary side) at a specified pressure.

[0062] The drive source 36 includes a fuel cell (FC) that generates electricity by chemically reacting hydrogen as a fuel gas and oxygen as an oxidizing gas, and a hydrogen engine that is an internal combustion engine using hydrogen as a fuel. For example, the fuel cell has a stack structure formed by laminating a plurality of unit cells. For example, the fuel cell generates electricity using oxygen contained in external air. It should be noted that the fuel cell may also be supplied with air containing oxygen through an oxidizing gas supply device (not shown).

[0063] For example, the hydrogen engine generates power for the discharging operation or the lowering operation of the discharging vehicle body 12. For example, the hydrogen engine generates power for turning the front wheels 21. For example, the power (rotational force) generated by the hydrogen engine is transmitted to the rear wheels 22 of the traveling device 13.

[0064] It should be noted that the hydrogen supply system 1 may also include a storage battery (for example, a secondary battery such as a lithium ion storage battery). For example, the storage battery stores the electricity generated in the fuel cell. For example, the storage battery may also function as a power source for the dump truck 2 in the same manner as the fuel cell.

[0065] <Configuration of System Components>

[0066] Refer also to Figure 1 , the drive source 36 is disposed at a position in front of the pressure reducing valve 35 with respect to the vehicle body. The drive source 36 is disposed at a position below the platform 17.

[0067] The drive source 36 and the pressure reducing valve 35 are mounted on the vehicle body frame 10. The drive source 36 and the pressure reducing valve 35 are preferably disposed within the vehicle width direction range of the vehicle body frame 10. According to this structure, the drive source 36 and the pressure reducing valve 35 are covered by the vehicle body frame 10 from below the vehicle body. Therefore, it is possible to suppress interference (such as flying stones) from reaching the drive source 36 and the pressure reducing valve 35 from below the vehicle body.

[0068] For example, in order to extend the operation time, a large amount of hydrogen needs to be carried, but the existing space (e.g., the space on the side of the vehicle body) is limited. In contrast, in the present embodiment, the hydrogen tank 25 is disposed on the back surface of the unloading vehicle body 12 (specifically, the lower surface of the protection device 16). There is an unused space (unused area) on the back surface of the unloading vehicle body 12, so the unused space can be effectively utilized. Thus, a large number of hydrogen tanks 25 can be carried.

[0069] In particular, the hydrogen tank 25 is lighter than the storage battery, so even when a large number of hydrogen tanks 25 are carried on the back surface of the unloading vehicle body 12, the possibility of affecting the soil discharging performance and the like is low. In addition, even assuming that hydrogen leaks from the hydrogen tank 25, hydrogen is lighter than air, so it is also preferable in terms of safety to be disposed near the highest position in the dump truck 2 (specifically, the lower surface of the protection device 16). For example, the shape of the unloading vehicle body 12 can be designed (e.g., increasing the vertical position of the protection device 16, etc.) to make the hydrogen tank 25 a multi-stage structure (e.g., an upper and lower two-stage structure). Thus, a further increase in the carrying capacity of the hydrogen tank 25 can be achieved.

[0070] For example, when the pipe (equivalent to a metal pipe) is arranged along the back surface of the unloading vehicle body 12, after passing along the central side in the vehicle width direction, it can be diverted to the side of the vehicle body frame 10 near the rotating part 11. After that, the part of the pipe diverted to the side of the vehicle body frame 10 can be connected to the hydrogen filling connector 50 and the drive source 36. For example, the installation position of the hydrogen filling connector 50 can be at a height that can be easily accessed from the ground. For example, considering the pressure loss, the part of the pipe up to the vicinity of the drive source 36 can be a high-pressure metal pipe capable of withstanding high-pressure hydrogen (e.g., about 70 MPa). On the other hand, the part of the pipe near the rotating part 11 can be a hose capable of withstanding swinging.

[0071] For example, in the case of an abnormality such as a fire occurring on the side of the vehicle body frame 10, it may be necessary to urgently discharge the hydrogen in the hydrogen tank 25. In this case, the hydrogen discharge pipe 58 can extend to the end of the unloading vehicle body 12 in a form branched from the hydrogen supply manifold 56. In Figure 3 the example, the hydrogen discharge pipe 58 extends to the right side of the protection device 16 of the unloading vehicle body 12. Thus, the hydrogen can be discharged from the right side surface of the unloading vehicle body 12 through the hydrogen discharge pipe 58.

[0072] It should be noted that the discharge of hydrogen is preferably carried out at the highest possible position. Therefore, when the hydrogen supply manifold 56 is mounted on the unloading vehicle body 12, it is easy as long as the hydrogen discharge pipe 58 is extended to the end of the unloading vehicle body 12, and the safety aspect is excellent.

[0073] <Effect>

[0074] As described above, the dump truck 2 of the present embodiment includes: a vehicle body frame 10 equipped with a drive source 36 that uses hydrogen as fuel, and a dump body 12 that is rotatably coupled to the vehicle body frame 10 through a rotating portion 11 and carries a load. The dump truck 2 also includes a hydrogen tank 25 that stores hydrogen. The hydrogen tank 25 is provided on the dump body 12.

[0075] According to this structure, since the hydrogen tank 25 is provided on the dump body 12, it is not necessary to carry a large amount of hydrogen as fuel in the limited space of the dump truck 2. Therefore, a large amount of hydrogen as fuel can be carried.

[0076] In the present embodiment, the dump body 12 includes a protection device 16 that protects the cab 15 from above. The hydrogen tank 25 is provided below the protection device 16.

[0077] According to this structure, compared with the case where the hydrogen tank 25 is provided above the protection device 16, it is possible to suppress interference from spreading to the hydrogen tank 25 from above the protection device 16. For example, when loading the load, the possibility of the load colliding with the hydrogen tank 25 can be reduced.

[0078] In the present embodiment, the dump truck 2 also includes a hydrogen supply pipe 55 for supplying hydrogen from the hydrogen tank 25 to the drive source 36. The hydrogen supply pipe 55 includes: a first supply portion 55A provided on the lower surface of the dump body 12, a second supply portion 55B provided on the vehicle body frame 10, and a third supply portion 55C that is bendable and combines the first supply portion 55A and the second supply portion 55B near the rotating portion 11.

[0079] According to this structure, with a simple structure of the hydrogen supply pipe 55 having three parts (the first supply portion 55A, the second supply portion 55B, and the third supply portion 55C), it does not affect the dumping operation and the lowering operation, and the hydrogen supply pipe 55 can be shortened as much as possible.

[0080] In the present embodiment, the dump truck 2 also includes a pressure reducing valve 35 provided between the second supply portion 55B and the drive source 36 and used for decompressing the fuel. The first supply portion 55A and the second supply portion 55B are composed of metal pipes. The third supply portion 55C is composed of a hose.

[0081] According to this structure, even when the hydrogen tank 25 stores high-pressure hydrogen (for example, about 70 MPa), it will not affect the unloading operation and the lowering operation, and the hydrogen supply pipe 55 can be shortened as much as possible. In addition, compared with the case where the pressure reducing valve 35 is provided in the first supply portion 55A, the pressure reducing valve 35 can be arranged in front of the drive source 36 with less pressure loss.

[0082] In the present embodiment, a plurality of first supply portions 55A are provided on the unloading vehicle body 12. The dump truck 2 further includes a hydrogen supply manifold 56 which is provided on the unloading vehicle body 12 and is used to gather a plurality of first supply portions 55A into the third supply portion 55C.

[0083] According to this structure, compared with the case where the hydrogen supply manifold 56 is provided on the vehicle body frame 10, the complication of the pipes connected to the hydrogen supply manifold 56 can be suppressed. For example, even when the hydrogen filling path (corresponding to the hydrogen filling system 3) and the hydrogen supply path (corresponding to the hydrogen supply system 4) are set as different systems from each other, only one third supply portion 55C needs to be provided in the hydrogen supply system 4. Therefore, the number of installations such as pipes can be suppressed to the minimum.

[0084] In the present embodiment, the dump truck 2 further includes a hydrogen discharge pipe 58 which branches from the hydrogen supply manifold 56 and discharges the hydrogen after the fuel is gasified. The hydrogen discharge pipe 58 discharges hydrogen from the side surface of the unloading vehicle body 12.

[0085] According to this structure, compared with the case where the hydrogen supply manifold 56 is provided on the vehicle body frame 10, it is easy to shorten the hydrogen discharge pipe 58 when the hydrogen discharge pipe 58 extends from the hydrogen supply manifold 56 to the side surface of the unloading vehicle body 12. In addition, when it is desired to discharge the hydrogen in the hydrogen tank 25 for safety, the hydrogen can be discharged from the side surface of the unloading vehicle body 12 through the hydrogen discharge pipe 58, so the safety aspect is excellent.

[0086] <Modification Example>

[0087] In the above embodiment, an example in which the hydrogen tank is provided below the protection device has been described, but it is not limited thereto. For example, the hydrogen tank may be provided above the protection device. For example, the hydrogen tank may be provided in a part other than the protection device in the unloading vehicle body. For example, the installation method of the hydrogen tank in the unloading vehicle body can be changed according to the design specifications.

[0088] In the above-described embodiment, an example in which the hydrogen supply pipe includes a first supply portion provided on the lower surface of the unloading vehicle body, a second supply portion provided on the vehicle body frame, and a third supply portion that is bendable and combines the first supply portion and the second supply portion near the rotating portion was described, but it is not limited thereto. For example, the hydrogen supply pipe may not include the first supply portion, the second supply portion, and the third supply portion. For example, the hydrogen supply pipe may extend telescopically from the hydrogen tank toward the drive source. For example, the configuration of the hydrogen supply pipe can be changed according to the design specifications.

[0089] In the above-described embodiment, an example in which the pressure reducing valve is provided between the second supply portion and the drive source was described, but it is not limited thereto. For example, the pressure reducing valve may be provided at a location other than between the second supply portion and the drive source. For example, the pressure reducing valve may be provided in the first supply portion. For example, the installation method of the pressure reducing valve can be changed according to the design specifications.

[0090] In the above-described embodiment, an example in which the first supply portion and the second supply portion are made of metal pipes was described, but it is not limited thereto. For example, the first supply portion and the second supply portion may also be made of pipes other than metal pipes. For example, the first supply portion and the second supply portion may be made of high-pressure pipes that can withstand high-pressure hydrogen (e.g., about 70 MPa). For example, the configuration of the first supply portion and the second supply portion can be changed according to the design specifications.

[0091] In the above-described embodiment, an example in which the dump truck further includes a hydrogen supply manifold is described. The hydrogen supply manifold is provided on the unloading vehicle body and is used to gather a plurality of first supply portions to the third supply portion, but it is not limited thereto. For example, the hydrogen supply manifold may also be provided on the vehicle body frame. For example, the installation method of the hydrogen supply manifold can be changed according to the design specifications.

[0092] In the above-described embodiment, an example in which the hydrogen discharge pipe branches from the hydrogen supply manifold provided on the unloading vehicle body and extends to the side surface of the unloading vehicle body was described, but it is not limited thereto. For example, when the hydrogen supply manifold is provided on the vehicle body frame, the hydrogen discharge pipe may also branch from the hydrogen supply manifold provided on the vehicle body frame and extend to the side surface of the unloading vehicle body. For example, the installation method of the hydrogen discharge pipe can be changed according to the design specifications.

[0093] In the above-described embodiment, an example in which the hydrogen filling system and the hydrogen supply system are configured such that the hydrogen flow paths are different systems from each other was described, but it is not limited thereto. For example, at least a part of the hydrogen filling system and the hydrogen supply system may also be configured such that the hydrogen flow paths are the same system as each other. For example, the configurations of the hydrogen filling system and the hydrogen supply system can be changed according to the design specifications.

[0094] The embodiments of the present invention have been described above. However, the present invention is not limited to these embodiments, and additional, omission, replacement, and other changes in the structure can be made without departing from the gist of the present invention. The above embodiments can also be appropriately combined.

[0095] (Supplementary Note 1)

[0096] A dump truck, comprising: a vehicle body frame on which a drive source using hydrogen as fuel is mounted; and a dump body which is rotatably coupled to the vehicle body frame through a rotating part and on which a load is mounted. Among them,

[0097] the dump truck further comprises a hydrogen tank for storing the hydrogen,

[0098] the hydrogen tank is provided on the dump body.

[0099] (Supplementary Note 2)

[0100] The dump truck according to Supplementary Note 1, wherein the dump body has a protection device for protecting the cab from above,

[0101] the hydrogen tank is provided below the protection device.

[0102] (Supplementary Note 3)

[0103] The dump truck according to Supplementary Note 1 or 2, wherein,

[0104] the dump truck further comprises a hydrogen supply pipe for supplying the hydrogen from the hydrogen tank to the drive source. The hydrogen supply pipe includes:

[0105] a first supply part provided on the lower surface of the dump body;

[0106] a second supply part provided on the vehicle body frame; and

[0107] a third supply part that can be bent freely, which combines the first supply part and the second supply part near the rotating part.

[0108] (Supplementary Note 4)

[0109] The dump truck according to Supplementary Note 3, wherein,

[0110] the dump truck further comprises a pressure reducing valve provided between the second supply part and the drive source and used for reducing the pressure of the fuel,

[0111] the first supply part and the second supply part are composed of metal pipes,

[0112] the third supply part is composed of a hose.

[0113] (Appendix Note 5)

[0114] The dump truck according to Appendix Note 3 or 4, wherein,

[0115] A plurality of the first supply parts are provided on the dump body,

[0116] The dump truck further includes a hydrogen supply manifold which is provided on the dump body and is configured to gather a plurality of the first supply parts at the third supply part.

[0117] (Appendix Note 6)

[0118] The dump truck according to Appendix Note 5, wherein,

[0119] The dump truck further includes a hydrogen discharge pipe which branches from the hydrogen supply manifold and discharges hydrogen after the fuel is gasified,

[0120] The hydrogen discharge pipe discharges the hydrogen from the side surface of the dump body.

[0121] Explanation of reference numerals:

[0122] 2... Dump truck; 10... Body frame; 11... Rotating part; 12... Dump body; 15... Cab; 16... Protection device; 25... Hydrogen tank; 35... Pressure reducing valve; 36... Drive source; 55... Hydrogen supply pipe; 55A... First supply part; 55B... Second supply part; 55C... Third supply part; 56... Hydrogen supply manifold; 58... Hydrogen discharge pipe.

Claims

1. A dump truck, comprising: a vehicle body frame on which a drive source using hydrogen as fuel is mounted; and a dump body that is rotatably coupled to the vehicle body frame via a rotating portion and on which a load is mounted. Wherein, the dump truck further comprises a hydrogen tank for storing the hydrogen, and the hydrogen tank is provided on the dump body.

2. The dump truck according to claim 1, wherein, the dump body is provided with a protection device for protecting the cab from above, and the hydrogen tank is provided below the protection device.

3. The dump truck according to claim 1 or 2, wherein, the dump truck further comprises a hydrogen supply pipe for supplying the hydrogen from the hydrogen tank to the drive source, and the hydrogen supply pipe includes: a first supply portion provided on the lower surface of the dump body; a second supply portion provided on the vehicle body frame; and a third supply portion that is bendable and that joins the first supply portion and the second supply portion near the rotating portion.

4. The dump truck according to claim 3, wherein, the dump truck further comprises a pressure reducing valve that is provided between the second supply portion and the drive source and that reduces the pressure of the fuel, the first supply portion and the second supply portion are formed of metal pipes, and the third supply portion is formed of a hose.

5. The dump truck according to claim 3, wherein, a plurality of the first supply portions are provided on the dump body, and the dump truck further comprises a hydrogen supply manifold that is provided on the dump body and that causes the plurality of first supply portions to converge on the third supply portion.

6. The dump truck according to claim 5, wherein, the dump truck further comprises a hydrogen discharge pipe that branches from the hydrogen supply manifold and discharges hydrogen gas after the fuel is vaporized, and the hydrogen discharge pipe discharges the hydrogen gas from the side surface of the dump body.

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