Electric dump truck

Abstract

We provide an electric dump vehicle that can utilize the space above the battery. [Solution] The electric dump vehicle comprises a vehicle body having a vehicle frame and wheels, a cargo bed positioned on the vehicle frame, a dumping device that moves the cargo bed relative to the vehicle body between a reference position on the vehicle body and a dumping position inclined relative to the vehicle body, a motor that rotates the wheels, and a battery fixed to the vehicle frame that supplies power to the motor. The dumping device comprises an extendable and retractable hydraulic cylinder and a hydraulic drive device that extends and retracts the hydraulic cylinder in order to move the cargo bed relative to the vehicle frame. At least a portion of the battery is positioned below the vehicle frame, and at least a portion of the hydraulic drive device overlaps with the battery in an up-down view and with the vehicle frame in a side view.

Description

Technical Field

[0001] This specification relates to an electric dump vehicle.

Background Art

[0002] Conventionally, for example, a dump vehicle includes a vehicle body having a vehicle body frame, a loading platform disposed on the vehicle body frame, a hydraulic cylinder that expands and contracts to move the loading platform with respect to the vehicle body frame, and a hydraulic drive device that expands and contracts the hydraulic cylinder (for example, Patent Document 1).

[0003] By the way, in recent years, electric work vehicles have been developed, and an electric work vehicle includes a motor that rotates wheels and a battery that is fixed to the vehicle body frame and supplies power to the motor (for example, Patent Document 2). And in an electric dump vehicle, not only a space for accommodating the motor and the battery but also a space for accommodating the hydraulic drive device is required.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] Therefore, the problem is to provide an electric dump vehicle that can utilize the space above the battery.

Means for Solving the Problems

[0006] [1] The electric dump vehicle includes a vehicle body having a vehicle body frame and wheels, a loading platform disposed on the vehicle body frame, A dumping device that moves the cargo bed relative to the vehicle body between a reference position on the vehicle body and a dumping position inclined relative to the vehicle body, A motor that rotates the aforementioned wheels, The vehicle comprises a battery fixed to the vehicle frame and supplying power to the motor, The dumping device is To move the cargo bed relative to the vehicle frame, a retractable hydraulic cylinder is provided, The hydraulic drive device for extending and retracting the hydraulic cylinder is provided, At least a portion of the battery is positioned below the vehicle frame. At least a portion of the hydraulic drive unit overlaps with the battery when viewed from above, and with the vehicle frame when viewed from below.

[0007] [2] Furthermore, in the electric dump vehicle described in [1] above, The hydraulic drive device is equipped with a tank for storing oil, At least a portion of the aforementioned tank overlaps with the battery when viewed from above. The lower part of the aforementioned tank overlaps with the vehicle frame when viewed from the side. The upper part of the tank is positioned above the vehicle frame and overlaps with the cargo bed located at the reference position. This configuration is also acceptable.

[0008] [3] Furthermore, in the electric dump vehicle described in [2] above, The aforementioned vehicle frame comprises a pair of front and rear vehicle frame structures that extend in the front-to-rear direction and are arranged in the left-to-right direction. The lower part of the tank is positioned between the pair of front and rear frames of the vehicle body, and overlaps with the front and rear frames of the vehicle body when viewed from the left and right. The cargo bed is provided with a pair of front and rear cargo bed frames at its lower end, which extend in the front-to-back direction and are arranged in the left-to-right direction. The upper part of the tank is positioned between the pair of front and rear frames of the cargo bed, and overlaps with the front and rear frames of the cargo bed when viewed from the left and right. Such a configuration may also be used.

[0009] [4] Further, in any one of the electric dump trucks of the above [1] to [3], the motor is disposed rearward of the battery, at least a part of the motor is disposed below the vehicle body frame, at least a part of at least one of the hydraulic drive device and the hydraulic cylinder is disposed below the vehicle body frame and between the battery and the motor. Such a configuration may also be used.

Brief Description of the Drawings

[0010] [Figure 1] A side view of an electric dump truck according to an embodiment, showing a state where the cargo bed is in a reference position [Figure 2] A side view of the electric dump truck according to the embodiment, showing a state where the cargo bed is in a dump position [Figure 3] An enlarged cross-sectional view of the main part taken along line III-III of FIG. 1 [Figure 4] An enlarged view of region IV of FIG. 1, showing a partial longitudinal section [Figure 5] A plan view of the main part of the region shown in FIG. 4, not showing the cargo bed [Figure 6] A side view of the main part of an electric dump truck according to another embodiment, showing a partial longitudinal section

Modes for Carrying Out the Invention

[0011] In each drawing, the dimensions of the components may be enlarged or reduced with respect to the actual dimensions for ease of understanding, and the dimensional ratios between the drawings may not match. In each drawing, for ease of understanding, a part of the components may be omitted.

[0012] Terms including ordinal numbers such as "1st," "2nd," etc., are used to describe various components, but these terms are used solely for the purpose of distinguishing one component from others, and the components are not particularly limited by these terms. Furthermore, the number of components including ordinal numbers is not particularly limited; for example, there may be only one. Also, the ordinal numbers used in the following specification and drawings may differ from the ordinal numbers described in the claims.

[0013] The following description will explain one embodiment of an electric dump truck with reference to Figures 1 to 5. Note that the following embodiment is provided as an example to aid in understanding the configuration of the electric dump truck and does not limit the configuration of the electric dump truck.

[0014] As shown in Figures 1 and 2, the electric dump vehicle 1 comprises a vehicle body 2, a cargo bed 3 positioned on the vehicle body 2, and a dumping device 4 that moves the cargo bed 3 relative to the vehicle body 2 between a reference position on the vehicle body 2 (see Figure 1) and a dumping position inclined relative to the vehicle body 2 (see Figure 2). The electric dump vehicle 1 is also called an electric dump truck.

[0015] The vehicle body 2 comprises a vehicle frame 5 positioned at the rear and a plurality of wheels 2a. The vehicle body 2 may also include a driver's cab (also called a "cab") 2b positioned in front of the vehicle frame 5, as in this embodiment.

[0016] In the following explanation and diagrams, the first direction D1 is referred to as the front-to-back direction (also called the "first lateral direction") D1, the second direction D2 is referred to as the left-to-right direction (also called the "second lateral direction") D2, and the third direction D3 is referred to as the up-and-down direction D3. In other words, each of the directions D1 to D3 is the direction as seen from the perspective of a person (driver) sitting in the driver's seat of the electric dump vehicle 1.

[0017] In the forward / backward direction D1, the direction of the arrow in the diagram is considered the forward direction, and the direction opposite to the direction of the arrow in the diagram is considered the backward direction. In the left / right direction D2, the direction of the arrow in the diagram is considered the left direction, and the direction opposite to the direction of the arrow in the diagram is considered the right direction. In the up / down direction D3, the direction of the arrow in the diagram is considered the up direction, and the direction opposite to the direction of the arrow in the diagram is considered the down direction.

[0018] The cargo bed 3 may, for example, as in this embodiment, comprise a cargo bed body 3a having a discharge opening at its rear end, a tailgate 3b rotatably connected to the cargo bed body 3a to open and close the discharge opening, and a cargo bed connecting portion 3c rotatably connected to the vehicle frame 5. As a result, the cargo bed 3 moves between a reference position (see Figure 1) and a dump position (see Figure 2) by rotating around the cargo bed connecting portion 3c as an axis.

[0019] The dumping device 4 includes a retractable hydraulic cylinder 6 and a hydraulic drive device 7 for retracting the hydraulic cylinder 6 in order to move the cargo bed 3 relative to the vehicle frame 5. The dumping device 4 may also include a link mechanism 8 connecting the cargo bed 3 and the vehicle frame 5, for example, as in this embodiment. The link mechanism 8 is not particularly limited, but for example, as in this embodiment, it may include first and second links 8a, 8b and first to fourth connecting parts 8c to 8f.

[0020] Specifically, for example, as in this embodiment, the vehicle frame 5, hydraulic cylinder 6, and first link 8a may be rotatably connected by a first connecting part 8c, the cargo bed 3 and second link 8b may be rotatably connected by a second connecting part 8d, the first link 8a and second link 8b may be rotatably connected by a third connecting part 8e, and the hydraulic cylinder 6 and second link 8b may be rotatably connected by a fourth connecting part 8f.

[0021] As a result, the hydraulic cylinder 6 extends and retracts, causing the cargo bed 3 to rotate around the cargo bed connection part 3c as an axis. Therefore, the cargo bed 3 moves between the reference position (see Figure 1) and the dump position (see Figure 2).

[0022] As shown in Figures 2 and 3, the electric dump vehicle 1 includes a motor 9 that rotates the wheels 2a and a battery 10 fixed to the vehicle frame 5 that supplies power to the motor 9. The electric dump vehicle 1 may also include, for example, an inverter 11 that controls the rotation of the motor 9 and a transmission device (for example, a transaxle integrating a transmission and a differential gear) 12 that transmits the rotation of the motor 9 to the left and right wheels 2a, 2a.

[0023] While not particularly limited, in this embodiment, the electric dump vehicle 1 is a rear-wheel drive vehicle. Also, while not particularly limited, the motor 9, inverter 11, and transmission device 12 are unitized by being fixed to a base 13 attached to the vehicle frame 5. This unitized component is also called, for example, an electric axle.

[0024] As shown in Figures 2 to 5, the hydraulic drive unit 7 is equipped with a tank 14 for storing the oil used in the hydraulic cylinder 6. The hydraulic drive unit 7 may also be equipped with a pump 15 for supplying oil to the hydraulic cylinder 6, a valve device 16 having at least one solenoid valve, and connecting hoses (not shown) for connecting the parts 6, 14, 15, and 16.

[0025] As a result, the hydraulic cylinder 6 extends and retracts as the pump 15 and valve device 16 operate. Although not particularly limited, for example, when the pump 15 operates and the solenoid valve of the valve device 16 opens and closes, oil is sent from the tank 14 to the hydraulic cylinder 6, causing the hydraulic cylinder 6 to extend, while for example, when the solenoid valve of the valve device 16 opens and closes, oil is returned from the hydraulic cylinder 6 to the tank 14, causing the hydraulic cylinder 6 to retract.

[0026] Furthermore, the electric dump vehicle 1 may also be equipped with an electric drive source 17 that drives, for example, a hydraulic drive unit 7 (specifically, a pump 15). The drive source 17 is not particularly limited, but may be, for example, a motor powered by a battery 10, and such motor is also called an electric PTO (Electric Power Take Off) as a power take-off device.

[0027] The vehicle body frame 5 comprises a pair of front and rear vehicle body frames 5a, 5a that extend in the front-rear direction D1 and are arranged in the left-right direction D2. In Figure 4 (and similarly in Figure 6), the cargo bed 3 is shown in a longitudinal section, and in Figure 5, the cargo bed 3 is not shown. Also, in Figures 4 and 5 (and similarly in Figure 6), the vehicle body 2 is shown by a dashed line.

[0028] The vehicle body frame 5 may, for example, as in this embodiment, include left and right vehicle body frames 5b that extend in the left-right direction D2 and connect a pair of front and rear vehicle body frames 5a, 5a. The front and rear vehicle body frames 5a may, for example, as in this embodiment, include an upper frame 5c that extends in the front-rear direction D1 and is positioned above, and a lower frame 5d that extends in the front-rear direction D1 and is positioned below.

[0029] The cargo bed 3 may have a pair of front and rear cargo bed frames 3d, 3d at its lower end, extending in the front-to-back direction D1 and arranged in the left-to-right direction D2. The front and rear cargo bed frames 3d may be fixed to the underside of the cargo bed body 3a, for example, as in this embodiment. The cargo bed 3 may also have left and right cargo bed frames 3e extending in the left-to-right direction D2 and connecting the pair of front and rear cargo bed frames 3d, 3d, for example, as in this embodiment.

[0030] The battery 10 may, for example, as in this embodiment, comprise a lower battery portion 10a positioned below the vehicle frame 5, and an upper battery portion 10b protruding upward from the lower battery portion 10a and overlapping with the vehicle frame 5 in a left-right view D2. As a result, a portion of the battery 10 is positioned below the vehicle frame 5. The upper battery portion 10b may also, for example, be positioned between a pair of front and rear vehicle frames 5a, 5a, as in this embodiment.

[0031] At least a portion of the motor 9 is positioned below the vehicle frame 5. The portion of the motor 9 positioned below the vehicle frame 5 may be a part, as in this embodiment, or it may be the entire motor 9. The motor 9 is also positioned behind the battery 10. At least a portion of the motor 9 may overlap with the battery 10, for example, in a view in the front-to-back direction D1.

[0032] As shown in Figures 4 and 5, the hydraulic drive unit 7 may include, for example, a first fixing means 18 for fixing the tank 14 to the vehicle frame 5, a second fixing means 19 for fixing the pump 15 to the vehicle frame 5, and a third fixing means 20 for fixing the valve device 16 to the vehicle frame 5.

[0033] A portion of the hydraulic cylinder 6 and a portion of the linkage mechanism 8 may overlap with the motor 9 (see Figure 3) in a vertical view D3, as in this embodiment. Also, the battery 10 may be positioned in front of the hydraulic cylinder 6 and the linkage mechanism 8, as in this embodiment. As a result, the battery 10 is separated from the hydraulic cylinder 6 and the linkage mechanism 8 in the front-rear direction D1 in a vertical view D3.

[0034] The entire tank 14 overlaps with the battery 10 in a vertical D3 view. The lower part of the tank 14 is positioned between a pair of front and rear vehicle frames 5a, 5a, and overlaps with the front and rear vehicle frames 5a of the vehicle frame 5 in a horizontal D2 view.

[0035] Furthermore, when the cargo bed 3 is in its reference position, the top of the tank 14 is positioned between the pair of cargo bed front and rear frames 3d, 3d, and overlaps with the cargo bed front and rear frames 3d in a left-right view D2. As a result, the top of the tank 14 is positioned above the vehicle frame 5, and the top of the tank 14 overlaps with the cargo bed 3 in its reference position in a left-right view D2.

[0036] Thus, since the tank 14 is positioned in the space between the battery 10 and the cargo bed 3, the space above the battery 10 can be utilized. Therefore, for example, it is possible to suppress the increase in size of the electric dump vehicle 1.

[0037] For example, as in this embodiment, the entire valve device 16 may overlap with the battery 10 in a vertical view (D3). Alternatively, as in this embodiment, the lower part of the valve device 16 may be positioned between a pair of front and rear vehicle frames 5a, 5a, and may overlap with the front and rear vehicle frames 5a in a horizontal view (D2).

[0038] Furthermore, the valve device 16 may be positioned between the tank 14 and the hydraulic cylinder 6 in the front-rear direction D1, for example, as in this embodiment. Also, the tank 14 may be positioned between the pump 15 and the valve device 16 in the front-rear direction D1, for example, as in this embodiment.

[0039] Based on the above, the electric dump vehicle 1 is as described in this embodiment. A vehicle body 2 having a vehicle frame 5 and wheels 2a, A cargo bed 3 is positioned on the aforementioned vehicle body frame 5, A dumping device 4 moves the cargo bed 3 relative to the vehicle body 2 between a reference position on the vehicle body 2 and a dumping position that is inclined relative to the vehicle body 2, A motor 9 rotates the wheel 2a, The vehicle body frame 5 is fixed to the battery 10 which supplies power to the motor 9, The dumping device 4 is To move the cargo bed 3 relative to the vehicle frame 5, a retractable hydraulic cylinder 6 is provided, The system includes a hydraulic drive device 7 for extending and retracting the hydraulic cylinder 6, At least a portion of the battery 10 is positioned below the vehicle frame 5. At least a portion of the hydraulic drive unit 7 overlaps with the battery 10 in a vertical view D3 and overlaps with the vehicle body frame 5 in a horizontal view D2. This configuration is also acceptable.

[0040] With this configuration, at least a portion of the hydraulic drive unit 7 overlaps with the battery 10 in a vertical view D3, and at least a portion of the hydraulic drive unit 7 overlaps with the vehicle frame 5 in a horizontal view D2. As a result, at least a portion of the hydraulic drive unit 7 is positioned in the space above the battery 10. Therefore, the space above the battery 10 can be utilized.

[0041] Furthermore, in the electric dump vehicle 1, as in this embodiment, The hydraulic drive unit 7 is equipped with a tank 14 for storing oil, At least a portion of the tank 14 overlaps with the battery 10 in the vertical D3 view, The lower part of the tank 14 overlaps with the vehicle frame 5 in a lateral view D2. The upper part of the tank 14 is positioned above the vehicle frame 5 and, in a lateral view D2, overlaps with the cargo bed 3 located at the reference position. This configuration is preferable.

[0042] With this configuration, the upper part of the tank 14 is positioned above the vehicle frame 5, and moreover, the upper part of the tank 14 overlaps with the cargo bed 3, which is located at the reference position, when viewed from the side in a D2 direction. As a result, the tank 14 is positioned in the space between the battery 10 and the cargo bed 3. Therefore, the space above the battery 10 can be effectively utilized.

[0043] Furthermore, in the electric dump vehicle 1, as in this embodiment, The vehicle body frame 5 comprises a pair of front and rear vehicle body frames 5a, 5a that extend in the front-rear direction D1 and are arranged in the left-right direction D2. The lower part of the tank 14 is positioned between the pair of front and rear vehicle frames 5a, 5a, and overlaps with the front and rear vehicle frames 5a in a left-right view D2. The cargo bed 3 is provided with a pair of cargo bed front and rear frames 3d, 3d at its lower end, which extend in the front-rear direction D1 and are arranged in the left-right direction D2. The upper part of the tank 14 is positioned between the pair of front and rear cargo bed frames 3d, 3d, and overlaps with the front and rear cargo bed frames 3d in a left-right view D2. This configuration is preferable.

[0044] With this configuration, the upper part of the tank 14 is positioned between a pair of front and rear cargo bed frames 3d, 3d, and the upper part of the tank 14 overlaps with the front and rear cargo bed frames 3d in a left-right view D2. As a result, the upper part of the tank 14 is positioned above the vehicle frame 5, and the upper part of the tank 14 overlaps with the cargo bed 3 located at the reference position in a lateral view D2.

[0045] It should be noted that the electric dump vehicle 1 is not limited to the configuration of the embodiment described above, nor is it limited to the effects and benefits described above. Furthermore, it goes without saying that the electric dump vehicle 1 can be modified in various ways without departing from the spirit of the present invention. For example, one or more of the configurations and methods described below may be arbitrarily selected and adopted in the configurations and methods of the embodiment described above.

[0046] (A) In the electric dump vehicle 1 according to the above embodiment, a portion of the battery 10 is located below the vehicle frame 5. However, the electric dump vehicle 1 is not limited to this configuration. For example, the entire battery 10 may be located below the vehicle frame 5.

[0047] (B) In addition, in the electric dump vehicle 1 according to the above embodiment, a part of the hydraulic drive unit 7 overlaps with the battery 10 in the vertical direction D3 view and overlaps with the vehicle body frame 5 in the horizontal direction D2 view. However, the electric dump vehicle 1 is not limited to this configuration. For example, the entire hydraulic drive unit 7 may be configured to overlap with the battery 10 in the vertical direction D3 view and overlap with the vehicle body frame 5 in the horizontal direction D2 view.

[0048] (C) In addition, in the electric dump vehicle 1 according to the above embodiment, the tank 14 and the valve device 16 are configured such that, among the tank 14, pump 15 and valve device 16, the parts that overlap with the battery 10 in the vertical direction D3 view and overlap with the vehicle frame 5 in the horizontal direction D2 view are the tank 14 and the valve device 16. However, the electric dump vehicle 1 is not limited to this configuration.

[0049] The component that overlaps with the battery 10 in the vertical D3 view and with the vehicle frame 5 in the horizontal D2 view may be, for example, only the tank 14, or for example, only the pump 15, or for example, only the valve device 16, or for example, the pump 15 and the valve device 16, or for example, the tank 14 and the pump 15, or for example, the tank 14, the pump 15 and the valve device 16.

[0050] (D) Furthermore, in the electric dump vehicle 1 according to the above embodiment, a part of the hydraulic drive unit 7 (specifically, the tank 14) is configured to overlap with the vehicle frame 5 in the left-right direction D2 view among the lateral directions D1 and D2. However, the electric dump vehicle 1 is not limited to this configuration.

[0051] For example, a part of the hydraulic drive unit 7 (specifically, the tank 14) may be configured to overlap with the vehicle frame 5 in a view in the front-rear direction D1. Alternatively, for example, a part of the hydraulic drive unit 7 (specifically, the tank 14) may be configured to overlap with the vehicle frame 5 in a lateral view that is different from the front-rear direction D1 and the left-right direction D2.

[0052] (E) In addition, in the electric dump vehicle 1 according to the above embodiment, the entire tank 14 is configured to overlap with the battery 10 when viewed in the vertical direction D3. However, the electric dump vehicle 1 is not limited to this configuration. For example, a part of the tank 14 may overlap with the battery 10 when viewed in the vertical direction D3.

[0053] (F) In addition, in the electric dump vehicle 1 according to the above embodiment, the upper part of the tank 14 is positioned above the vehicle frame 5 and overlaps with the cargo bed 3 located at the reference position in a lateral view D2. However, the electric dump vehicle 1 is not limited to this configuration.

[0054] For example, the upper end of the tank 14 may be positioned lower than the upper end of the vehicle frame 5. Alternatively, for example, the upper end of the tank 14 may be positioned above the vehicle frame 5 and below the lower end of the cargo bed 3 (i.e., it does not overlap with the cargo bed 3 located at the reference position in the lateral view D1, D2).

[0055] (G) In addition, in the electric dump vehicle 1 according to the above embodiment, the upper part of the tank 14 is configured to overlap with the cargo bed 3 located at the reference position when viewed in the left-right direction D2 of the lateral directions D1 and D2. However, the electric dump vehicle 1 is not limited to this configuration.

[0056] For example, the top of the tank 14 may be configured to overlap with the cargo bed 3 located at the reference position when viewed in the front-rear direction D1. Alternatively, for example, the top of the tank 14 may be configured to overlap with the cargo bed 3 located at the reference position when viewed in a lateral direction different from the front-rear direction D1 and the left-right direction D2.

[0057] (H) In addition, in the electric dump vehicle 1 according to the above embodiment, the tank 14 is positioned between a pair of front and rear body frames 5a, 5a. However, the electric dump vehicle 1 is not limited to this configuration. For example, the tank 14 may be positioned outside the pair of front and rear body frames 5a, 5a.

[0058] (I) In the electric dump vehicle 1 according to the above embodiment, the tank 14 is positioned between a pair of front and rear cargo bed frames 3d, 3d. However, the electric dump vehicle 1 is not limited to this configuration. For example, the tank 14 may be positioned outside the pair of front and rear cargo bed frames 3d, 3d.

[0059] (J) Alternatively, for example, in the electric dump vehicle 1, at least a part of the hydraulic drive unit 7 may be located between the battery 10 and the motor 9. Although not particularly limited, one example of such a configuration is shown in Figure 6.

[0060] (J-1) As shown in Figure 6, for example, a part of the hydraulic drive unit 7 may be positioned below the vehicle frame 5 and between the battery 10 and the motor 9. Specifically, for example, as shown in Figure 6, the valve device 16 may be positioned below the vehicle frame 5 and between the battery 10 and the motor 9. Furthermore, for example, at least a part of the valve device 16 may overlap with the battery 10 and the motor 9 in a view in the front-rear direction D1.

[0061] Thus, in the electric dump vehicle 1, as shown in Figure 6, The motor 9 is positioned behind the battery 10. At least a portion of the motor 9 is positioned below the vehicle body frame 5. At least a portion of the hydraulic drive unit 7 and the hydraulic cylinder 6 (in Figure 6, the hydraulic drive unit 7) is positioned below the vehicle frame 5 and between the battery 10 and the motor 9. This configuration is also acceptable.

[0062] With this configuration, at least a portion of the hydraulic drive unit 7 is positioned between the battery 10 and the motor 9. This allows the space between the battery 10 and the motor 9 to be utilized.

[0063] (J-2) In Figure 6, the component located below the vehicle frame 5 and between the battery 10 and the motor 9 is a valve device 16, but the configuration is not limited to this. The component located below the vehicle frame 5 and between the battery 10 and the motor 9 may be, for example, a tank 14 (or part thereof), or a pump 15 (or part thereof).

[0064] (J-3) In Figure 6, the component located below the vehicle frame 5 and between the battery 10 and the motor 9 is a part of the hydraulic drive unit 7, but the configuration is not limited to this. The component located below the vehicle frame 5 and between the battery 10 and the motor 9 may be, for example, a part of the hydraulic cylinder 6 (for example, the part including the first connection part 8c), or it may be, for example, at least a part of the hydraulic drive unit 7 and at least a part of the hydraulic cylinder 6.

[0065] (K) For example, the execution order of each step, such as the operation, procedure, step, and stage, in the method and apparatus shown in the claims, specification, and drawings can be carried out in any order, as long as the result of the previous step is not used in the later step. For example, even if "first," "next," etc. are used for convenience in the explanation, it does not mean that it is necessary to perform them in that order. [Explanation of Symbols]

[0066] 1…Electric dump vehicle, 2…Body, 2a…Wheels, 2b…Driver's cab, 3…Cargo bed, 3a…Cargo bed main body, 3b…Tailgate, 3c…Cargo bed connection section, 3d…Front and rear cargo bed frames, 3e…Left and right cargo bed frames, 4…Dumping device, 5…Body frame, 5a…Front and rear body frames, 5b…Left and right body frames, 5c…Upper frame, 5d…Lower frame, 6…Hydraulic cylinder, 7…Hydraulic drive unit, 8…Link mechanism, 8a…First link, 8b…Second link, 8c… 8d…First connection part, 8e…Second connection part, 8f…Fourth connection part, 9…Motor, 10…Battery, 10a…Bottom of battery, 10b…Top of battery, 11…Inverter, 12…Transmission device, 13…Base, 14…Tank, 15…Pump, 16…Valve device, 17…Drive source, 18…First fixing means, 19…Second fixing means, 20…Third fixing means, D1…Front-back direction (first lateral direction), D2…Left-right direction (second lateral direction), D3…Up-down direction

Claims

1. A vehicle body having a frame and wheels, A cargo bed positioned on the aforementioned vehicle frame, A dumping device that moves the cargo bed relative to the vehicle body between a reference position on the vehicle body and a dumping position inclined relative to the vehicle body, A motor that rotates the aforementioned wheels, The vehicle comprises a battery fixed to the vehicle frame and supplying power to the motor, The dumping device is To move the cargo bed relative to the vehicle frame, a retractable hydraulic cylinder is provided, The hydraulic drive device for extending and retracting the hydraulic cylinder is provided, At least a portion of the battery is positioned below the vehicle frame. An electric dump vehicle in which at least a portion of the hydraulic drive system overlaps with the battery when viewed from above and with the vehicle frame when viewed from below.

2. The hydraulic drive device is equipped with a tank for storing oil, At least a portion of the aforementioned tank overlaps with the battery when viewed from above. The lower part of the aforementioned tank overlaps with the vehicle frame when viewed from the side. The electric dump vehicle according to claim 1, wherein the upper part of the tank is positioned above the vehicle frame and, in a lateral view, overlaps with the cargo bed located at the reference position.

3. The aforementioned vehicle frame comprises a pair of front and rear vehicle frame structures that extend in the front-to-rear direction and are arranged in the left-to-right direction. The lower part of the tank is positioned between the pair of front and rear frames of the vehicle body, and overlaps with the front and rear frames of the vehicle body when viewed from the left and right. The cargo bed is provided with a pair of front and rear cargo bed frames at its lower end, which extend in the front-to-back direction and are arranged in the left-to-right direction. The electric dump vehicle according to claim 2, wherein the upper part of the tank is positioned between the pair of front and rear frames of the cargo bed and overlaps with the front and rear frames of the cargo bed when viewed from the left and right.

4. The motor is positioned behind the battery. At least a portion of the motor is positioned below the vehicle body frame. The electric dump vehicle according to any one of claims 1 to 3, wherein at least a portion of at least one of the hydraulic drive unit and the hydraulic cylinder is positioned below the vehicle frame and between the battery and the motor.

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