Dump truck

Abstract

To provide a dump truck capable of mounting an electric apparatus (a reactor for smoothing a discharge current and a resistor for smoothing a discharge current) in a ready-made shape (or in a shape close to the ready-made shape) without requiring a housing of a special shape.SOLUTION: A dump truck 1 includes a vehicle body frame 6, a cab 5, a vessel 3, a battery 17, a traveling electric motor 9, a discharge current smoothing reactor 21, a discharge current smoothing resistor 22, and a device mounting member 31. The device mounting member 31 has a frame member 33 (lower frame member 34 and upper frame member 35) having a frame shape for mounting the discharge current smoothing reactor 21 and the discharge current smoothing resistor 22. The device mounting member 31 is attached to the other end side (more specifically, right side) in the right and left directions of an upper transverse beam 12.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present disclosure relates to a dump truck that is suitable for use in transporting crushed stone excavated, for example, from an open-cut mining site, a quarry, or a mine. [Background technology]

[0002] Generally, a large vehicle called a dump truck has a vessel (cargo platform) that is provided on a frame of a vehicle body so that it can be raised and lowered. The dump truck transports a large amount of heavy cargo, such as crushed stone, loaded in the vessel to a cargo receiving location. Here, Patent Document 1 describes a dump truck having power storage devices stacked on the deck of the vehicle body. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2016-078714 A Summary of the Invention [Problem to be solved by the invention]

[0004] Dump trucks are equipped with electrical equipment such as power storage devices and resistors on their vehicle bodies. In many cases, ready-made electrical equipment manufactured by electrical equipment manufacturers is installed as such electrical equipment. For this reason, it may not be possible to significantly change the shapes of electrical equipment such as power storage devices and resistors. In such cases, it may be possible to combine a number of electrical equipment of a predetermined size into a single unit (assembly) by stacking them in a layout and incorporating the electrical equipment in a housing that matches the layout.

[0005] However, when the mounting space is limited or when the housing (box) must have a special shape due to the surrounding equipment, it may be difficult to manufacture the housing. In addition, the weight of the housing may increase in order to maintain its strength, which may increase the manufacturing cost of the housing. For example, the dump truck in Patent Document 1 has a parallelogram-shaped housing in which multiple power storage devices are installed. This may make it difficult to manufacture the housing.

[0006] An object of the present invention is to provide a dump truck capable of mounting electrical equipment in the shape of a ready-made product (or in a shape similar to that of a ready-made product) without requiring a housing of a special shape. [Means for solving the problem]

[0007] The present invention is preferably a dump truck comprising: a body frame having a base frame extending in a fore-and-aft direction and to which wheels are attached, and an upper cross beam arranged above the base frame and extending in a left-right direction; a cab arranged on one left-right end side of the upper cross beam and supported from below by the upper cross beam; a loading platform having a top plate extending forward so as to cover above the cab and attached to a rear part of the base frame so as to be rotatable in the vertical direction with the rear part as a fulcrum; a battery mounted on the body frame; an electric motor that drives the wheels with power supplied from the battery; a discharge current smoothing reactor and a discharge current smoothing resistor that smooth out a discharge current discharged from the battery and supplied to the electric motor; and an equipment mounting member having a framework-shaped frame member on which the discharge current smoothing reactor and the discharge current smoothing resistor are mounted, and attached to the other left-right end side of the upper cross beam. Effect of the Invention

[0008] According to the present invention, electrical equipment (discharge current smoothing reactor, discharge current smoothing resistor) can be mounted in its existing shape (or in a shape close to that of an existing product) without requiring a specially shaped housing. [Brief description of the drawings]

[0009] [Figure 1] FIG. 2 is a right side view showing the dump truck according to the embodiment. [Diagram 2] FIG. 2 is an enlarged view of part (II) in FIG. [Diagram 3] 4 is a right side view showing the device mounting member, the discharge current smoothing reactor, the discharge current smoothing resistor, and the regenerative power consumption resistor. FIG. [Figure 4] FIG. 2 is a perspective view showing an equipment mounting member, a discharge current smoothing reactor, a discharge current smoothing resistor, and a regenerative power consumption resistor. [Diagram 5] 13 is a right side view showing the process of mounting a discharge current smoothing reactor, a discharge current smoothing resistor, and a regenerative power consumption resistor together with the equipment mounting member on an upper cross beam of the vehicle body frame. FIG. [Figure 6] FIG. 2 is a perspective view showing a frame member (lower frame member) constituting the equipment mounting member. [Figure 7] FIG. 2 is a perspective view showing a frame member (upper frame member) constituting the equipment mounting member. [Figure 8] FIG. 2 is a front view showing the vehicle body frame, the equipment mounting member, the discharge current smoothing reactor, and the regenerative power consumption resistor. [Figure 9] 2 is a plan view showing a vehicle body frame, an equipment mounting member, a discharge current smoothing reactor, a discharge current smoothing resistor, and a regenerative power consumption resistor. FIG. [Figure 10] 9 is a perspective view looking up from the lower left side of FIG. 8 at the upper cross beam, the equipment mounting member, the discharge current smoothing reactor, the discharge current smoothing resistor, and the regenerative power consumption resistor. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] A dump truck according to an embodiment will be described in detail below with reference to the attached drawings. In the embodiment, the traveling direction of the dump truck 1 is the front-rear direction, and the direction perpendicular to the traveling direction is the left-right direction. For example, the front-rear direction of the dump truck 1 corresponds to the left-right direction in Fig. 1 (the right side of Fig. 1 is the front side of the dump truck 1, and the left side of Fig. 1 is the rear side of the dump truck 1), and the left-right direction of the dump truck 1 corresponds to the front-rear direction in Fig. 1 (the front side of Fig. 1 is the right side of the dump truck 1, and the back side of Fig. 1 is the left side of the dump truck 1).

[0011] In FIG. 1, the dump truck 1 is configured as a large vehicle including a vehicle body 2 and a vessel 3 as a loading platform mounted on the vehicle body 2 in a manner that allows it to be raised and lowered. The vessel 3 is formed as a large container with a total length of 9 to 13 meters in order to carry a large amount of heavy loads such as crushed stone. The vessel 3 is connected to the rear end side of the vehicle body 2 via a connecting pin 4 so that it can be raised and lowered (tilted). A top plate 3A is integrally provided on the upper front side of the vessel 3 as a eaves portion that covers the cab 5 from above.

[0012] The vehicle body 2 of the dump truck 1 includes a vehicle body frame 6, a cab 5, a building 14, a deck 15, etc. The cab 5 is located below the top plate 3A and provided on the left side of the front part of the vehicle body 2. The cab 5 forms a driver's compartment where the driver of the dump truck 1 gets on and off. A driver's seat, a start switch, an accelerator pedal, a brake pedal, a steering wheel for steering, and a plurality of operation levers (none of which are shown) are provided inside the cab 5. The top plate 3A of the vessel 3 almost completely covers the cab 5 from above, thereby protecting the cab 5 from flying stones such as rocks and also protecting the driver in the cab 5 when the vehicle (dump truck 1) overturns.

[0013] The left and right front wheels 7 are rotatably provided on the front side of the vehicle body 2. The left and right front wheels 7 constitute steered wheels that are steered by the driver of the dump truck 1 (or by automatic driving from the outside). The front wheels 7, like the rear wheels 8, are formed with a tire diameter (i.e., outer diameter dimension) of, for example, 2 to 4 meters. Front-wheel suspensions (not shown) consisting of hydraulic shock absorbers are provided between the front of the vehicle body 2 and the front wheels 7.

[0014] The left and right rear wheels 8 are rotatably provided on the rear side of the vehicle body 2. The left and right rear wheels 8 constitute the drive wheels of the dump truck 1. The left and right rear wheels 8 are rotated by a traveling electric motor 9 serving as an electric motor. Rear-wheel suspensions (not shown) consisting of hydraulic shock absorbers are provided between the rear of the vehicle body 2 and the rear wheels 8, respectively.

[0015] The vehicle body frame 6 is the base of the vehicle body 2, and is configured as a strong supporting structure extending in the front-rear direction. As shown in Figures 8 and 9, the vehicle body frame 6 includes a base frame 11 and an upper cross beam 12.

[0016] The base frame 11 comprises a rear frame portion 11B that is approximately rectangular in shape and has an oval opening 11A in the center, a left leg portion 11C and a right leg portion 11C that extend forward from the front end of the rear frame portion 11B in a bifurcated (V-shaped or U-shaped) shape, a connecting beam portion 11D that connects the front ends of the left leg portion 11C and the right leg portion 11C in the left-right direction, a left support portion 11E and a right support portion 11E that protrude upward in an arc-like shape from a midpoint of the left leg portion 11C and the right leg portion 11C, and a left cylinder mounting portion 11F and a right cylinder mounting portion 11F that protrude downward in a mountain shape from near the boundary between the left leg portion 11C and the rear frame portion 11B and near the boundary between the right leg portion 11C and the rear frame portion 11B.

[0017] The left and right support columns 11E, 11E support the upper cross beam 12 from below. The left and right cylinder mounting portions 11F, 11F form a mounting bracket for the hoist cylinder 13. A pair of left and right bracket portions 11G, 11G is provided on the rear end side of the rear frame portion 11B. The rear bottom of the vessel 3 is connected to the bracket portion 11G via a connecting pin 4 so as to be tiltable.

[0018] The upper cross beam 12, together with the base frame 11, constitutes the vehicle body frame 6. The upper cross beam 12 is supported from below by the left support column 11E and the right support column 11E of the base frame 11, and extends in the left-right direction. The upper cross beam 12 supports the deck 15, the cab 5, etc., from below. As shown in Fig. 8, the upper cross beam 12 is composed of an intermediate beam portion 12A located in the middle of its length direction, and a left beam portion 12B as one side beam portion and a right beam portion 12C as the other side beam portion, which are integrally provided on both the left and right sides of the intermediate beam portion 12A by welding or the like.

[0019] A control cabinet 18 (FIG. 5) is attached onto the middle beam section 12A. A cab 5 is attached onto the left beam section 12B. A regenerative power consumption resistor (second resistor) 20, a discharge current smoothing reactor (reactor) 21, and a discharge current smoothing resistor (first resistor) 22 (described later) are attached onto the right beam section 12C via an equipment mounting member 31.

[0020] The hoist cylinders 13 are provided in pairs in the left-right direction between the body frame 6 and the vessel 3 (only the right side is shown). The hoist cylinders 13 are, for example, hydraulic cylinders, and tilt the front side of the vessel 3 up and down relative to the body frame 6. One end side (lower end side) of the hoist cylinders 13 is attached to the support shaft 11F1 of the cylinder attachment portion 11F. The other end side (upper end side) of the hoist cylinders 13 is attached to the underside of the vessel 3.

[0021] The hoist cylinder 13 extends vertically when pressure oil is supplied from a hydraulic pump (not shown). As a result, the front side (top plate 3A side) of the vessel 3 is lifted upward around the connecting pin 4, and the transported goods loaded on the vessel 3 can be discharged rearward.

[0022] The building 14 is provided on the front end side of the body frame 6. The building 14 is formed in a frame shape surrounded by left and right side panels and a front panel (grill), and a battery 17 and the like are housed inside the building 14. The building 14, together with the support columns 11E, 11E and the upper cross beam 12 of the body frame 6, also plays a role in supporting the deck 15 and the like from below.

[0023] The deck 15 is located forward of the vessel 3 and provided above the building 14. The deck 15 is formed in the shape of a rectangular flat plate that is long in the left-right direction and extends horizontally while being supported from below by the support columns 11E, 11E and the upper cross beam 12 of the body frame 6. The upper surface of the deck 15 forms a flat passageway surface along which the operator and others pass.

[0024] A rear wheel axle housing 16 is provided on the rear side of the body frame 6. The axle housing 16 is made of a cylindrical body extending in the left-right direction, and is attached to the body frame 6 via a rear wheel suspension device (not shown). A traveling electric motor 9 is provided on each of the left and right sides of the axle housing 16. The rotation of the left and right traveling electric motors 9 is transmitted to the left and right rear wheels 8 via a reduction mechanism (not shown).

[0025] The battery 17 is located below the deck 15 and mounted on the front side of the body frame 6. The battery 17 is disposed between the left leg 11C and the right leg 11C, and is attached to the body frame 6 via an anti-vibration mount or the like (not shown). The left and right electric motors 9 for traveling are supplied with power from the battery 17 to drive the left and right rear wheels 8.

[0026] The control cabinet 18 (FIG. 5) is located to the right of the cab 5 and is mounted on the upper side of the deck 15. The control cabinet 18 is configured to include an inverter that controls the traveling electric motor 9. The control cabinet 18 is attached onto the intermediate beam portion 12A of the upper cross beam 12.

[0027] Next, a description will be given of the traveling electric motor 9, the battery 17, the trolley device 19, the regenerative power consumption resistor 20 as a second resistor, the discharge current smoothing reactor 21 as a reactor, and the discharge current smoothing resistor 22 as a first resistor, which are mounted on the vehicle body 2. The traveling electric motor 9, the battery 17, the trolley device 19, the regenerative power consumption resistor 20, the discharge current smoothing reactor 21, and the discharge current smoothing resistor 22 constitute an electric circuit (not shown) that drives the dump truck 1 to travel.

[0028] The dump truck 1 of the embodiment is configured as a battery dump truck for mining. The battery dump truck is equipped with a battery 17 instead of a diesel engine. In addition, a trolley device 19 for supplying power from a trolley overhead line (not shown) is mounted on the front of the deck 15. The trolley device 19 supplies power from the trolley overhead line to the traveling electric motor 9 and / or the battery 17. For this purpose, the trolley device 19 is connected to the traveling electric motor 9 and the battery 17.

[0029] Also, a regenerative power consumption resistor 20 is provided on the deck 15, located on the right side of the vehicle body 2. The regenerative power consumption resistor 20 as a second resistor consumes regenerative power from the traveling electric motor 9. The regenerative power consumption resistor 20 of the battery dump truck is similar to (common to) a regenerative power consumption resistor of a dump truck equipped with a diesel engine. In the battery dump truck of the embodiment, the regenerative power consumption resistor 20 consumes regenerative power that cannot be charged to the battery 17, for example, when the battery 17 is fully charged. The regenerative power consumption resistor 20 is connected to the traveling electric motor 9 via a chopper, an inverter, etc. (not shown).

[0030] Furthermore, the battery dump truck is equipped with a battery 17 instead of a diesel engine, and needs to be equipped with a discharge current smoothing reactor 21 and a discharge current smoothing resistor 22 as a measure against the high-frequency components of the current discharged from the battery 17 to the traveling electric motor 9. The discharge current smoothing reactor 21 and the discharge current smoothing resistor 22 suppress (remove or cut off) the high-frequency current, which is a high-frequency component, of the direct current discharged from the battery 17, and supply the smoothed direct current to the traveling electric motor 9. Specifically, the discharge current smoothing reactor 21 as a reactor suppresses the amplitude of the high-frequency current. The discharge current smoothing resistor 22 as a first resistor adjusts the frequency of the high-frequency current. The discharge current smoothing reactor 21 and the discharge current smoothing resistor 22, together with the trolley device 19, the traveling electric motor 9, and the battery 17, form an electric circuit (travel drive circuit).

[0031] The discharge current smoothing reactor 21 and the discharge current smoothing resistor 22, together with the regenerative power consumption resistor 20, are attached to the vehicle body frame 6 (more specifically, to the right beam portion 12C of the upper cross beam 12) via an equipment mounting member 31. As shown in Fig. 3 and Fig. 4, in this embodiment, three regenerative power consumption resistors 20, two discharge current smoothing reactors 21, and four discharge current smoothing resistors 22 are mounted together on the equipment mounting member 31.

[0032] 2, a regenerative power consumption resistor 20 used to consume regenerative power generated by the traveling electric motor 9, and the vessel 3 are arranged around a space for mounting a discharge current smoothing reactor 21 and a discharge current smoothing resistor 22 used to smooth the discharge current of the battery 17. Therefore, the space for mounting the discharge current smoothing reactor 21 and the discharge current smoothing resistor 22 is approximately trapezoidal. Two types of devices, the discharge current smoothing reactor 21 and the discharge current smoothing resistor 22, need to be mounted in this approximately trapezoidal space.

[0033] In this case, for example, it is conceivable to manufacture a dedicated housing that fits the approximately trapezoidal space and incorporate the discharge current smoothing reactor 21 and the discharge current smoothing resistor 22 into this housing to make them into a single unit (assembly). However, in this case, the size of the housing becomes larger, and the difficulty of manufacturing the housing increases.

[0034] On the other hand, it is possible to manufacture separate housings (a housing for the reactor and a housing for the resistor) for each of the discharge current smoothing reactor 21 and the discharge current smoothing resistor 22, divided into required sizes. In this case, it is thought that the weight of each housing can be reduced. However, in terms of strength, it is difficult to stack the housings. Furthermore, if the strength of the housings is increased to enable stacking, the weight of the housings increases.

[0035] Therefore, in the embodiment, the discharge current smoothing reactor 21 and the discharge current smoothing resistor 22 are integrated into a single unit (assembly) using a stackable frame member 33. That is, in the embodiment, the stackable frame member 33 is configured by a lower frame member 34 shown in Fig. 6 and an upper frame member 35 shown in Fig. 7. The discharge current smoothing reactor 21 and the discharge current smoothing resistor 22 are attached together to the vehicle body frame 6 (more specifically, the right beam portion 12C of the upper cross beam 12) by the equipment mounting member 31 having such frame members 33 (the lower frame member 34 and the upper frame member 35).

[0036] In the embodiment, the frame member 33 (lower frame member 34, upper frame member 35) supporting the discharge current smoothing reactor 21 and the discharge current smoothing resistor 22 and the pair of frame bodies 36 supporting the regenerative power consumption resistor 20 as a whole are connected by the bracket 37 (upper bracket 37A, lower bracket 37B). This makes it possible to integrate the frame member 33 and the pair of frame bodies 36, and to suppress deformation and damage of the frame member 33 and the pair of frame bodies 36. According to this embodiment, as shown in FIG. 5, the discharge current smoothing reactor 21, the discharge current smoothing resistor 22, and the regenerative power consumption resistor 20 can be hung as one unit (assembly). These points will be described in detail below.

[0037] The equipment mounting member 31 includes a bottom frame 32, a frame member 33 (a lower frame member 34 and an upper frame member 35), a pair of frame bodies 36, and a bracket 37. The bottom frame 32 is formed as a rectangular frame member. The bottom frame 32 is fixed to the vehicle body frame 6 (more specifically, the right beam portion 12C of the upper cross beam 12). The frame member 33 (more specifically, the lower frame member 34) and the pair of frame bodies 36 are fixed to the bottom frame 32. Three regenerative power consumption resistors 20, one discharge current smoothing reactor 21, and two discharge current smoothing resistors 22 are placed on the bottom frame 32.

[0038] The frame member 33 supports the discharge current smoothing reactor 21 and the discharge current smoothing resistor 22 so that they can be stacked together. The frame member 33 includes a lower frame member 34 located on the lower side, and an upper frame member 35 located above the lower frame member 34. As shown in Fig. 6, the lower frame member 34 includes six legs 34A, 34A, and a rectangular connecting frame 34B fixed to the upper ends of the legs 34A, 34A.

[0039] The connecting frame 34B includes a left frame 34B1 and a right frame 34B2 that are spaced apart in the left-right direction and extend in the front-rear direction, and a front frame 34B3, a middle frame 34B4, and a rear frame 34B5 that connect the left frame 34B1 and the right frame 34B2. Two discharge current smoothing resistors 22 are placed on the connecting frame 34B.

[0040] The six legs 34A extend downward from six positions: the "connection portion between the left frame 34B1 and the front frame 34B3," the "connection portion between the left frame 34B1 and the middle frame 34B4," the "connection portion between the left frame 34B1 and the rear frame 34B5," the "connection portion between the right frame 34B2 and the front frame 34B3," the "connection portion between the right frame 34B2 and the middle frame 34B4," and the "connection portion between the right frame 34B2 and the rear frame 34B5." The lower ends of the six legs 34A are fixed to the bottom frame 32. Two discharge current smoothing resistors 22 are disposed in a rectangular parallelepiped space surrounded by the bottom frame 32, the legs 34A, and the connecting frame 34B.

[0041] 7, the upper frame member 35 includes four legs 35A, 35A, and a rectangular connecting frame 35B fixed to the upper ends of the legs 35A, 35A. The connecting frame 35B includes a left frame 35B1 and a right frame 35B2 that are spaced apart in the left-right direction and extend in the front-rear direction, and a front frame 35B3 and a rear frame 35B4 that connect the left frame 35B1 and the right frame 35B2. One discharge current smoothing reactor 21 is placed on the connecting frame 35B.

[0042] The four legs 35A, 35A extend downward from four positions: "a connection portion between the left frame 35B1 and the front frame 35B3," "a connection portion between the left frame 35B1 and the rear frame 35B4," "a connection portion between the right frame 35B2 and the front frame 35B3," and "a connection portion between the right frame 35B2 and the rear frame 35B4." The lower ends of the four legs 35A, 35A are each fixed to the lower frame member 34 (connecting frame 34B). In a rectangular parallelepiped space surrounded by the connecting frame 34B of the lower frame member 34, the legs 35A, 35A, and the connecting frame 35B of the upper frame member 35, one discharge current smoothing resistor 22 is disposed.

[0043] The pair of frame bodies 36 support the regenerative power consumption resistors 20 in a stacked state. Each of the frame bodies 36 is formed in an inverted U-shape. The pair of frame bodies 36 are fixed to the bottom frame 32 with a space between them in the left-right direction. The frame body 36 includes a pair of support columns 36A, 36A extending in the vertical direction, and a connecting portion 36B that connects the pair of support columns 36A, 36A at the upper end side of the pair of support columns 36A, 36A. The three regenerative power consumption resistors 20 are sandwiched in the front-rear direction by the pair of support columns 36A, 36A. The lower ends of the pair of support columns 36A, 36A are fixed to the bottom frame 32. In this state, the three regenerative power consumption resistors 20 are sandwiched in the vertical direction by the connecting portion 36B of the pair of support columns 36A, 36A and the bottom frame 32.

[0044] The bracket 37 connects the pair of frame bodies 36 and the frame member 33. The bracket 37 fixes the pair of frame bodies 36 and the frame member 33 to each other. The bracket 37 has an upper bracket 37A and a lower bracket 37B. The upper bracket 37A connects the connecting frame 35B of the upper frame member 35 to the support pillar 36A of the frame body 36. The lower bracket 37B connects the connecting frame 34B of the lower frame member 34 to the support pillar 36A of the frame body 36.

[0045] As shown in Figs. 3 and 4, the three regenerative power consumption resistors 20, the two discharge current smoothing reactors 21, and the four discharge current smoothing resistors 22 are grouped together by the equipment mounting member 31 into a unit (assembly), that is, an equipment mounting unit 40 (equipment mounting assembly). As shown in Fig. 5, the equipment mounting unit 40 is suspended by a cable 41. That is, the equipment mounting unit 40 can be attached to and detached from the vehicle body frame 6 (more specifically, the right beam portion 12C of the upper cross beam 12) as a whole by being suspended by the cable 41. When the equipment mounting unit 40 is suspended by the cable 41, the cable 41 is engaged with the connecting portion 36B of the frame body 36 and the connecting frame 34B of the lower frame member 34. For this purpose, a locking member 34B6 is provided on the connecting frame 34B (the left frame 31B1 and the right frame 31B2).

[0046] As described above, according to the embodiment, the dump truck 1, which is a battery dump truck, includes the vehicle body frame 6, the cab 5, the vessel 3 as a loading platform, the battery 17, the traveling electric motor 9 as an electric motor, the discharge current smoothing reactor 21, the discharge current smoothing resistor 22, and the equipment mounting member 31. The dump truck 1 also includes a regenerative power consumption resistor 20. The vehicle body frame 6 has a base frame 11 and an upper cross beam 12. The base frame 11 extends in the front-rear direction and has wheels (front wheels 7 and rear wheels 8) attached thereto. The upper cross beam 12 is disposed above the base frame 11 and extends in the left-right direction.

[0047] The cab 5 is disposed at one end (more specifically, the left side) of the upper cross beam 12 in the left-right direction. The cab 5 is supported from below by the upper cross beam 12 (more specifically, the left side beam portion 12B). The vessel 3 has a top plate 3A that protrudes forward so as to cover the upper part of the cab 5. The vessel 3 is attached to the rear of the base frame 11 so as to be rotatable in the vertical direction with the rear part as a fulcrum.

[0048] The battery 17 is mounted on the vehicle body frame 6. The traveling electric motor 9 drives the wheels (rear wheels 8) with power supplied from the battery 17. Note that, although the dump truck 1 in the embodiment is a rear-wheel drive dump truck 1, the present invention is not limited thereto and may be, for example, a front-wheel drive dump truck or a four-wheel drive dump truck.

[0049] The discharge current smoothing reactor 21 is provided in an electric circuit (electrical circuit for driving the vehicle) including the battery 17 and the traveling electric motor 9. The discharge current smoothing resistor 22 is provided in an electric circuit (electrical circuit for driving the vehicle) including the battery 17 and the traveling electric motor 9. The discharge current smoothing reactor 21 and the discharge current smoothing resistor 22 smooth the discharge current discharged from the battery 17 and supplied to the traveling electric motor 9.

[0050] The regenerative power consumption resistor 20 is provided in an electric circuit (electric circuit for driving the vehicle) including the battery 17 and the electric motor 9 for traveling. The regenerative power consumption resistor 20 consumes regenerative power of the electric motor 9 for traveling.

[0051] The equipment mounting member 31 has a framework-shaped frame member 33 (a lower frame member 34 and an upper frame member 35) on which the discharge current smoothing reactor 21 and the discharge current smoothing resistor 22 are mounted. The equipment mounting member 31 is attached to the other end side (more specifically, the right side) in the left-right direction of the upper cross beam 12. In the embodiment, in addition to the discharge current smoothing reactor 21 and the discharge current smoothing resistor 22, the equipment mounting member 31 also has a regenerative power consumption resistor 20 mounted thereon.

[0052] The regenerative power consumption resistor 20 is disposed at the frontmost side of the equipment mounting member 31. The discharge current smoothing reactor 21 and the discharge current smoothing resistor 22 are disposed at the rear side of the regenerative power consumption resistor 20. As shown in Fig. 3, with the discharge current smoothing reactor 21 and the discharge current smoothing resistor 22 mounted on the equipment mounting member 31, the rear height dimension Hr is smaller than the front height dimension Hf.

[0053] In addition, when the discharge current smoothing reactor 21, the discharge current smoothing resistor 22 and the regenerative power consumption resistor 20 are mounted on the equipment mounting member 31, the overall center of gravity of the equipment mounting member 31, the discharge current smoothing reactor 21, the discharge current smoothing resistor 22 and the regenerative power consumption resistor 20 is located on the upper cross beam 12 (more specifically, the right side beam portion 12C).

[0054] In the embodiment, the discharge current smoothing reactor 21, the discharge current smoothing resistor 22, and the regenerative power consumption resistor 20 are mounted together on the equipment mounting member 31. However, the present invention is not limited to this, and although not shown, the discharge current smoothing reactor and the discharge current smoothing resistor may be mounted together on the equipment mounting member. In other words, the regenerative power consumption resistor may be mounted separately from the discharge current smoothing reactor and the discharge current smoothing resistor. In this case, when the discharge current smoothing reactor and the discharge current smoothing resistor are mounted on the equipment mounting member, the center of gravity of the equipment mounting member, the discharge current smoothing reactor, and the discharge current smoothing resistor is positioned on the upper cross beam (right beam portion).

[0055] 1 and 2, the discharge current smoothing reactor 21 is disposed in a position facing the vessel 3 with a gap therebetween. Also, as shown in Figs. 1 to 4, the upper surface of the discharge current smoothing reactor 21, which is mounted at the highest position, is located higher than the upper surface of the regenerative power consumption resistor 20, which is mounted at the highest position. Furthermore, an outlet 22A (only shown in Fig. 3) for the cooling air flowing through the discharge current smoothing resistor 22 is disposed on the outside (more specifically, on the right side) of the vehicle body 2 configured including the vehicle body frame 6.

[0056] Furthermore, the frame members 33 (lower frame member 34 and upper frame member 35) have a configuration that allows the discharge current smoothing reactor 21 and the discharge current smoothing resistor 22 to be mixed and stacked. The equipment mounting member 31 is configured to include a frame body 36 that supports the regenerative power consumption resistors 20 in a stacked state. As a result, the equipment mounting member 31, together with the frame members 33 (lower frame member 34 and upper frame member 35) and the frame body 36, configures an equipment mounting unit 40 that is detachable from the vehicle frame 6 and collectively includes the discharge current smoothing reactor 21, the discharge current smoothing resistor 22, and the regenerative power consumption resistor 20.

[0057] The dump truck 1 according to this embodiment has the configuration as described above, and hereinafter, an operation of transporting minerals mined in a mine using the dump truck 1 will be described.

[0058] The dump truck 1 loads minerals mined by a hydraulic excavator into a vessel 3 in a loading area, transports the minerals to a dumping area located away from the loading area, and dumps them (discharges them). In general, the loading area and the dumping area are flat roads, and the dumping area is set at a higher position than the loading area. For this reason, the road from the loading area to the dumping area is an uphill road. When the dump truck 1 travels on an uphill road, for example, the dump truck 1 drives the traveling electric motor 9 with power from the trolley overhead line, and when the dump truck 1 travels on a flat road, for example, the dump truck 1 drives the traveling electric motor 9 with power from the battery 17.

[0059] First, the dump truck 1 loads minerals excavated by a hydraulic excavator (not shown) into the vessel 3 in the loading area. Since the loading area is usually on a flat road that does not require a large amount of power, the traveling electric motor 9 is driven by power from the battery 17. That is, power from the battery 17 is supplied to the traveling electric motor 9 via an inverter or the like in the control cabinet 18. The dump truck 1 travels on the flat road in the loading area by controlling the rotation of the left and right traveling electric motors 9 by the inverter.

[0060] When the dump truck 1 approaches an uphill road from a flat road, the trolley device 19 provided at the front end of the vehicle body 2 is extended and brought into sliding contact with the trolley wire installed on the uphill road. As a result, power from the trolley wire is supplied to the traveling electric motors 9 via an inverter or the like in the control cabinet 18. The dump truck 1 travels uphill toward the soil discharge area by controlling the rotation of the left and right traveling electric motors 9 by the inverter. At this time, the power supplied from the trolley wire is also supplied to the battery 17, which is charged.

[0061] When the dump truck 1 traveling on the uphill road reaches the dumping area, the dumping area is flat, so the dump truck 1 travels in the dumping area using power from the battery 17. When the dump truck 1 reaches the dumping area, it extends the hoist cylinder 13. This causes the vessel 3 to tilt via the connecting pin 4, and the minerals loaded in the vessel 3 can be discharged into the dumping area.

[0062] In this way, after discharging the minerals loaded in the vessel 3 to the dumping area, the dump truck 1 travels toward the loading area to load new minerals. Since the dumping area is located higher than the loading area, the travel route from the dumping area to the loading area is a downhill road. Since a large amount of electric power is not required on a downhill road, the dump truck 1 drives the traveling electric motor 9 with electric power from the battery 17.

[0063] Here, when the dump truck 1 travels downhill, the left and right electric motors 9 for travel generate electric power (regenerative power). This regenerative power can be charged to the battery 17. Furthermore, when the regenerative power is surplus power to the battery 17, the regenerative power is supplied to the regenerative power consumption resistor 20 via a chopper in the control cabinet 18, and is converted from electrical energy to thermal energy by the regenerative power consumption resistor 20 and consumed.

[0064] In this way, the dump truck 1 travels between the loading area and the dumping area while appropriately selecting the power from the trolley wire and the power from the battery 17 according to the traveling road surface. Then, the dump truck 1 transports the minerals loaded in the vessel 3 in the loading area to the dumping area and repeats the operation of discharging the minerals in the dumping area.

[0065] Here, according to the embodiment, the device mounting member 31 has a framework-shaped frame member 33 (lower frame member 34 and upper frame member 35) on which the discharge current smoothing reactor 21 and the discharge current smoothing resistor 22 are mounted. The frame member 33 (lower frame member 34 and upper frame member 35) has a simple shape and is not required to have a complex shape like a housing, and can mount the discharge current smoothing reactor 21 and the discharge current smoothing resistor 22 together. This allows the discharge current smoothing reactor 21 and the discharge current smoothing resistor 22 to be mounted in the shape of a ready-made product (or in a shape close to the shape of a ready-made product) without requiring a housing with a special shape.

[0066] In this case, by using the frame member 33 (the lower frame member 34 and the upper frame member 35) for the equipment mounting member 31, the limited mounting space can be used effectively. Also, there is no need to make the shapes of the discharge current smoothing reactor 21 and the discharge current smoothing resistor 22 special. In addition, it is sufficient that the frame member 33 (the lower frame member 34 and the upper frame member 35) ensures the strength of the equipment mounting member 31 to a minimum, and the weight of the equipment mounting member 31 as a whole can be reduced. Also, since the frame member 33 (the lower frame member 34 and the upper frame member 35) unitizes (assembles) the discharge current smoothing reactor 21 and the discharge current smoothing resistor 22, the surroundings of the discharge current smoothing reactor 21 and the discharge current smoothing resistor 22 are opened compared to the case where a housing is used. Therefore, the cooling property (heat dissipation property) can be improved.

[0067] In addition, because the discharge current smoothing reactor 21 and the discharge current smoothing resistor 22 are integrated into one by the frame member 33 (the lower frame member 34 and the upper frame member 35), the strength of the frame member 33 (the lower frame member 34 and the upper frame member 35) can be increased by connecting it to a peripheral device (for example, the regenerative power consumption resistor 20). This makes it possible to suppress damage and deformation of the device mounting member 31 including the frame member 33 (the lower frame member 34 and the upper frame member 35).

[0068] In addition, because the discharge current smoothing reactor 21 and the discharge current smoothing resistor 22 are integrated by the frame members 33 (the lower frame member 34 and the upper frame member 35), they can be sub-assembled, improving the ease of assembly. This reduces the number of assembly steps, reduces the number of disassembly steps for on-site delivery, and improves workability on-site.

[0069] That is, the discharge current smoothing reactor 21 and the discharge current smoothing resistor 22 can be transported as an equipment mounting unit 40 including them. When assembling the dump truck 1, the equipment mounting unit 40 including the discharge current smoothing reactor 21 and the discharge current smoothing resistor 22 can be attached together to the upper cross beam 12 (more specifically, the right beam portion 12C). This improves the workability at the assembly site. When performing maintenance and replacement of the discharge current smoothing reactor 21 or the discharge current smoothing resistor 22, the equipment mounting unit 40 can be removed together from the upper cross beam 12 (more specifically, the right beam portion 12C). This improves the workability of maintenance and replacement.

[0070] According to the embodiment, in addition to the discharge current smoothing reactor 21 and the discharge current smoothing resistor 22, the regenerative power consumption resistor 20 is also mounted on the device mounting member 31. Therefore, the device mounting member 31 can mount the discharge current smoothing reactor 21, the discharge current smoothing resistor 22, and the regenerative power consumption resistor 20 all together.

[0071] According to the embodiment, the regenerative power consumption resistor 20 is disposed at the frontmost side of the equipment mounting member 31. In addition, the discharge current smoothing reactor 21 and the discharge current smoothing resistor 22 are disposed behind the regenerative power consumption resistor 20. This makes it possible to "ensure the cooling performance of the regenerative power consumption resistor 20" and "mount the discharge current smoothing reactor 21, the discharge current smoothing resistor 22, and the regenerative power consumption resistor 20 together" at the same time.

[0072] According to the embodiment, the rear height dimension Hr is smaller than the front height dimension Hf with the discharge current smoothing reactor 21 and the discharge current smoothing resistor 22 mounted on the equipment mounting member 31. Therefore, the discharge current smoothing reactor 21 and the discharge current smoothing resistor 22 can be efficiently accommodated in the limited space between the top plate 3A of the vessel 3 and the upper cross beam 12 of the body frame 6.

[0073] According to the embodiment, in a state where the discharge current smoothing reactor 21, the discharge current smoothing resistor 22, and the regenerative power consumption resistor 20 are mounted on the equipment mounting member 31, the center of gravity of the equipment mounting member 31, the discharge current smoothing reactor 21, the discharge current smoothing resistor 22, and the regenerative power consumption resistor 20 is located on the upper cross beam 12 (more specifically, the right beam portion 12C). Therefore, the discharge current smoothing reactor 21, the discharge current smoothing resistor 22, and the regenerative power consumption resistor 20 can be stably mounted on the upper cross beam 12 (more specifically, the right beam portion 12C).

[0074] Although not shown in the figures, the discharge current smoothing reactor and the discharge current smoothing resistor may be mounted together on the equipment mounting member, i.e., the regenerative power consumption resistor may be mounted separately from the discharge current smoothing reactor and the discharge current smoothing resistor. In this case, when the discharge current smoothing reactor and the discharge current smoothing resistor are mounted on the equipment mounting member, the center of gravity of the equipment mounting member, the discharge current smoothing reactor, and the discharge current smoothing resistor is positioned on the upper cross beam (right beam portion). This allows the discharge current smoothing reactor and the discharge current smoothing resistor to be stably mounted on the upper cross beam (right beam portion).

[0075] 1 and 2, according to the embodiment, the discharge current smoothing reactor 21 is disposed at a position facing the vessel 3 with a gap therebetween. Therefore, the discharge current smoothing reactor 21 can be efficiently cooled by the outside air flowing along the lower surface side of the top plate 3A of the vessel 3 during traveling.

[0076] According to the embodiment, the upper surface of the discharge current smoothing reactor 21 mounted at the highest position is located above the upper surface of the regenerative power consumption resistor 20 mounted at the highest position. Therefore, the outside air that has passed over the upper surface of the regenerative power consumption resistor 20 during driving can be directly applied to the discharge current smoothing reactor 21. This ensures the cooling of both the regenerative power consumption resistor 20 and the discharge current smoothing reactor 21.

[0077] According to the embodiment, the outlet 22A (only shown in FIG. 3) of the cooling air flowing through the discharge current smoothing resistor 22 is disposed on the outside (more specifically, on the right side) of the vehicle body 2 configured including the vehicle body frame 6. Therefore, the cooling air flowing through the discharge current smoothing resistor 22 can be discharged toward the outside of the vehicle body 2. This makes it possible to prevent the cooling air from stagnating around the discharge current smoothing resistor 22, and the discharge current smoothing resistor 22 can be efficiently cooled.

[0078] According to the embodiment, the frame member 33 has a configuration that allows the discharge current smoothing reactor 21 and the discharge current smoothing resistor 22 to be mixed and stacked. The device mounting member 31 includes a frame body 36 that supports the regenerative power consumption resistors 20 in a stacked state. The device mounting member 31, together with the frame member 33 and the frame body 36, configures a device mounting unit 40 that collectively includes the discharge current smoothing reactor 21, the discharge current smoothing resistor 22, and the regenerative power consumption resistor 20 and is detachable from the vehicle frame 6. This significantly improves the ease of assembly, transportation, and removal of these electrical devices.

[0079] In the embodiment, an example has been described in which the cab 5 is disposed to the left of the upper cross beam 12 of the vehicle body frame 6, and the discharge current smoothing reactor 21, the discharge current smoothing resistor 22, and the regenerative power consumption resistor 20 are disposed to the right of the upper cross beam 12. However, this is not limiting, and for example, the cab may be disposed to the right of the upper cross beam of the vehicle body frame, and the discharge current smoothing reactor, the discharge current smoothing resistor, and the regenerative power consumption resistor may be disposed to the left of the upper cross beam.

[0080] Also, for example, the regenerative power consumption resistor may be disposed at a position separate from the discharge current smoothing reactor and the discharge current smoothing resistor. In this case, the discharge current smoothing reactor and the discharge current smoothing resistor may be mounted together on the vehicle frame (upper cross beam) by an equipment mounting member. Also, for example, the discharge current smoothing reactor and the discharge current smoothing resistor and other equipment (for example, automatic driving control equipment) may be mounted together on the vehicle frame (upper cross beam) by an equipment mounting member.

[0081] In the embodiment, the description has been given taking the rear-wheel drive dump truck 1 as an example. However, the present invention is not limited to this, and can be applied to, for example, a front-wheel drive dump truck or a four-wheel drive dump truck in which both the front and rear wheels are driven.

[0082] In the embodiment, the description has been given taking as an example a dump truck 1 of trolley specifications equipped with a trolley device 19. However, the present invention is not limited to this, and may be applied to a dump truck in which the traveling electric motor 9 is driven only by electric power supplied from a battery 17, for example. [Explanation of symbols]

[0083] 1. Dump truck 2. Body 3 Vessel (cargo platform) 3A Top Board 5 Cab 6 Body frame 7 Front wheels (wheels) 8 Rear wheel (wheel) 9. Electric motor for driving (electric motor) 11 Base frame 12 Upper crossbeam 17 Battery 20 Regenerative power consumption resistor (second resistor) 21 Discharge current smoothing reactor (reactor) 22 Discharge current smoothing resistor (first resistor) 22A Exit 31 Equipment mounting parts 33 Frame members 34 Lower frame member 35 Upper frame member

Claims

1. a vehicle body frame including a base frame extending in a front-rear direction and to which wheels are attached, and an upper cross beam disposed above the base frame and extending in a left-right direction; A cab is disposed on one end side of the upper cross beam in the left-right direction and supported from below by the upper cross beam; a loading platform having a top plate extending forward so as to cover an upper portion of the cab and attached to a rear portion of the base frame so as to be rotatable in a vertical direction with the rear portion as a fulcrum; A battery mounted on the vehicle body frame; an electric motor that drives the wheels using electric power supplied from the battery; a discharge current smoothing reactor and a discharge current smoothing resistor for smoothing a discharge current discharged from the battery and supplied to the electric motor; a frame member having a framework-like shape on which the discharge current smoothing reactor and the discharge current smoothing resistor are mounted, and an equipment mounting member attached to the other end side of the upper cross beam in the left-right direction.

2. The dump truck according to claim 1, wherein the equipment mounting member is also equipped with a regenerative power consumption resistor that consumes regenerative power of the electric motor, in addition to the discharge current smoothing reactor and the discharge current smoothing resistor.

3. The regenerative power consumption resistor is disposed at the frontmost side of the equipment mounting member, The dump truck according to claim 2 , wherein the discharge current smoothing reactor and the discharge current smoothing resistor are disposed rearward of the regenerative power consumption resistor.

4. The dump truck according to claim 1 , wherein a height dimension of a rear side is lower than a height dimension of a front side when the discharge current smoothing reactor and the discharge current smoothing resistor are mounted on the equipment mounting member.

5. 2. The dump truck according to claim 1, wherein, when the discharge current smoothing reactor and the discharge current smoothing resistor are mounted on the equipment mounting member, the overall center of gravity of the equipment mounting member, the discharge current smoothing reactor, and the discharge current smoothing resistor is located on the upper cross beam.

6. 3. The dump truck according to claim 2, wherein when the discharge current smoothing reactor, the discharge current smoothing resistor, and the regenerative power consumption resistor are mounted on the equipment mounting member, an overall center of gravity of the equipment mounting member, the discharge current smoothing reactor, the discharge current smoothing resistor, and the regenerative power consumption resistor is located on the upper cross beam.

7. The dump truck according to claim 1 , wherein the discharge current smoothing reactor is disposed at a position facing the bed with a gap therebetween.

8. The dump truck according to claim 2 , wherein an upper surface of the discharge current smoothing reactor mounted at the highest position is positioned higher than an upper surface of the regenerative power consumption resistor mounted at the highest position.

9. The dump truck according to claim 1 , wherein an outlet for cooling air flowing through the discharge current smoothing resistor is disposed outside a vehicle body including the vehicle body frame.

10. the frame member has a configuration in which the discharge current smoothing reactor and the discharge current smoothing resistor can be mixed and stacked, the device mounting member includes a frame that supports the regenerative power consumption resistors in a stacked state, The dump truck according to claim 2, characterized in that the equipment mounting member, together with the frame member and the framework, collectively configures the discharge current smoothing reactor, the discharge current smoothing resistor, and the regenerative power consumption resistor to form an equipment mounting unit that is detachable from the vehicle frame.

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