dump truck

Abstract

To improve the ease of installation of equipment such as radiators to the vehicle frame. [Solution] Between the body frame 8 of the dump truck 1 and the radiator 30, a radiator mounting base 25 is provided to fix the radiator 30 to the body frame 8. Multiple mounting base seats 21 are integrally provided on the body frame 8, to which multiple types of radiator mounting bases 25 can be selectively attached according to the type of radiator 30. The multiple mounting base seats 21 have mounting surfaces 22A, 23A, and 24A that form the same plane with respect to each other and to which the radiator mounting base 25 is attached. The radiator mounting base 25 is attached to one of the multiple mounting base seats 21, 22A, 23A, or 24A, depending on the mounting position of the radiator 30 on the body frame 8.

Description

Technical Field

[0001] The present disclosure relates to a dump truck suitably used for transporting crushed stones and the like mined in mines and the like.

Background Art

[0002] A dump truck for transporting crushed stones and the like mined in a mine includes a vehicle body frame to which wheels are attached, a loading platform provided tiltably with respect to the vehicle body frame, and a prime mover such as an engine mounted on the front side of the vehicle body frame. Further, a radiator is mounted on the front end side of the vehicle body frame, and the prime mover is cooled by this radiator.

[0003] The specifications of the engine of a dump truck may differ depending on the environment of the area where it is used (for example, the presence or absence of exhaust gas regulations). For example, an engine corresponding to exhaust gas regulations has an EGR (Exhaust Gas Recirculation) system, and the amount of heat dissipation during operation is larger than that of an engine not equipped with an EGR system. Therefore, the radiator for cooling the engine equipped with an EGR system needs to be larger than the radiator for cooling the engine not equipped with an EGR system. Thus, when the size (type) of the radiator is different, it is necessary to change the mounting structure of the radiator to the vehicle body frame, but an increase in the type of vehicle body frame is not preferable for inventory management.

[0004] On the other hand, Patent Document 1 proposes a dump truck having a structure in which screw seats are provided on the left and right side surfaces on the front end side of the vehicle body frame, and radiators are attached to these left and right screw seats via brackets respectively. According to the dump truck of this Patent Document 1, different types of radiators can be attached to the front end side of the commonized vehicle body frame by replacing the brackets according to the type of radiator to be mounted.

Prior Art Documents

Patent Documents

[0005] [Patent Document 1] Patent No. 7374276 [Overview of the Initiative] [Problems that the invention aims to solve]

[0006] However, behind the radiator mounted on the front end of the vehicle frame, cooling fans, hydraulic equipment, etc., are located, and when performing maintenance on these cooling fans, etc., it is necessary to secure space for maintenance behind the radiator. However, in the dump truck described in Patent Document 1, when performing maintenance on the cooling fans, etc., the radiator must be removed from the vehicle frame to secure space, and after maintenance, the radiator must be reattached to the vehicle frame using a bracket. For this reason, the dump truck described in Patent Document 1 has the problem of poor overall workability for maintenance work.

[0007] The object of the present invention is to provide a dump truck that can improve workability when attaching or detaching equipment such as radiators to the vehicle frame, or when performing maintenance on such equipment. [Means for solving the problem]

[0008] The present invention relates to a dump truck comprising a vehicle frame extending in the front-rear direction and to which left and right wheels are attached, a cargo bed provided so as to be tiltable relative to the vehicle frame for loading cargo, and equipment attached to the vehicle frame, wherein an equipment fixing base is provided between the vehicle frame and the equipment for fixing the equipment to the vehicle frame, a plurality of fixing base mounting seats are integrally provided on the vehicle frame, and the equipment fixing base has a configuration that allows it to be selectively attached to the plurality of fixing base mounting seats depending on the mounting position of the equipment to the vehicle frame. [Effects of the Invention]

[0009] According to the present invention, by selectively attaching the equipment mounting base to a plurality of mounting bases provided on the vehicle frame, equipment can be mounted at different locations on the vehicle frame. This improves the ease of maintenance and installation of the equipment. [Brief explanation of the drawing]

[0010] [Figure 1] This is a left side view showing a dump truck according to the first embodiment of the present invention. [Figure 2] This is a perspective view showing the vehicle frame as a standalone component. [Figure 3] This is an exploded perspective view showing the radiator mounting base and frame bumper according to the first embodiment. [Figure 4] This is a top view of the radiator mounting base and frame bumper, separated from each other. [Figure 5] This is a top-down plan view of the radiator mounting base after it has been fixed in place. [Figure 6] This is a top-down plan view showing the radiator mounting base fixed in the maintenance position. [Figure 7] This is a perspective view showing a radiator assembly with the radiator, scaffolding components, etc., mounted on a radiator mounting base. [Figure 8] This is a left side view showing the radiator fixed in its designated position on the vehicle frame. [Figure 9] This is a left side view showing the radiator fixed to the maintenance position on the vehicle frame. [Figure 10] This is an exploded perspective view showing the radiator mounting base and frame bumper according to the second embodiment. [Modes for carrying out the invention]

[0011] Hereinafter, embodiments of the dump truck according to the present invention will be described in detail with reference to the attached drawings. In these embodiments, the direction of travel of the dump truck will be described as the front-rear direction, and the direction perpendicular to the direction of travel will be described as the left-right direction.

[0012] Figures 1 to 9 show the first embodiment. The dump truck 1 according to the first embodiment is equipped with an engine that does not have an EGR (exhaust gas recirculation) system, for example, and is equipped with a radiator 30, which will be described later, to cool this engine.

[0013] In the diagram, the dump truck 1 consists of a self-propelled body 2 equipped with left and right front wheels 3 and left and right rear wheels 4, and a cargo bed 5 mounted on the body 2 so as to be tiltable (up and down). It is used to transport materials such as crushed stone excavated in a mine by loading them onto the cargo bed 5. The body 2 of the dump truck 1 consists of a body frame 8, deck 32, cab 33, etc., which will be described later.

[0014] The left and right front wheels 3 are rotatably mounted on the front of the vehicle body 2 and constitute the steering wheels. The front wheels 3 are supported by the vehicle body frame 8 via the front wheel suspension 3A, which mitigates vibrations transmitted from the front wheels 3 to the vehicle body 2. The left and right rear wheels 4 are mounted on the rear of the vehicle body 2 and are rotationally driven by a running gear 6 equipped with an electric motor. The running gear 6 for the rear wheels 4 is supported by the vehicle body frame 8 via the rear wheel suspension 4A, which mitigates vibrations transmitted from the rear wheels 4 to the vehicle body 2.

[0015] The cargo bed (vessel) 5 is mounted on the vehicle frame 8 in a tiltable (up and down) manner. The cargo bed 5 is formed as a large, bottomed container for loading large quantities of minerals, etc., mined by, for example, a hydraulic excavator (not shown). The rear bottom of the cargo bed 5 is tiltably connected to the left and right rear end brackets 18, which will be described later, provided on the vehicle frame 8, via connecting pins 5A. An overhang 5B is integrally provided on the front side of the cargo bed 5, extending horizontally forward from its top. The overhang 5B of the cargo bed 5 extends to the front end of the deck 32, covering the cab 33 from above.

[0016] The hoist cylinder 7 is provided in pairs in the left - right direction between the vehicle body frame 8 and the loading platform 5 (only the left side is shown). The hoist cylinder 7 is, for example, a hydraulic cylinder, and tilts the front side of the loading platform 5 vertically with respect to the vehicle body frame 8. One end side (lower end side) of the hoist cylinder 7 is rotatably attached to a cylinder support shaft 19A described later, and the other end side (upper end side) of the hoist cylinder 7 is rotatably attached to the lower surface side of the loading platform 5. Therefore, by extending or contracting the hoist cylinder 7, the front side of the loading platform 5 (the side of the eaves portion 5B) rotates (moves up and down) in the vertical direction with the connecting pin 5A as a fulcrum. As a result, the front side of the loading platform 5 is lifted upward, and the transported goods loaded on the loading platform 5 can be discharged.

[0017] Next, the vehicle body frame 8 used in this embodiment will be described with reference to FIGS. 2 and 3. This vehicle body frame 8 is configured as a common component that can mount not only the radiator 30 illustrated in this embodiment but also the radiator 43 illustrated in the second embodiment.

[0018] The vehicle body frame 8 serves as the base of the vehicle body 2 and constitutes a strong support structure. The vehicle body frame 8 includes a main frame 9 extending in the front - rear direction and a frame bumper 20 fixedly integrated on the front side of the main frame 9. The main frame 9 is composed of a left frame 10, a right frame 11, a front frame 12, a rear frame 13, an upper plate 14, a lower plate 15, a left support column 16, a right support column 17, etc.

[0019] The left frame 10 is arranged on the left side of the vehicle body frame 8 and extends in the front - rear direction. The left frame 10 includes left and right side plates 10A facing each other in the left - right direction, an upper plate 14 closing the upper ends of the left and right side plates 10A, and a lower plate 15 connecting the lower ends of the left and right side plates 10A. The right frame 11 is arranged on the right side of the vehicle body frame 8 and extends in the front - rear direction. The right frame 11 includes left and right side plates 11A facing each other in the left - right direction, an upper plate 14 closing the upper ends of the left and right side plates 11A, and a lower plate 15 connecting the lower ends of the left and right side plates 11A.

[0020] The front frame 12 connects the front end of the left frame 10 and the front end of the right frame 11. The front frame 12 is composed of a front plate 12A and a rear plate (not shown) that face each other in the front-rear direction, an upper plate 14 that closes the upper ends of the front plate 12A and the rear plate, and a lower plate 15 that closes the lower ends of the front plate 12A and the rear plate. The left end of the front frame 12 is welded to the front end of the left frame 10, and the right end of the front frame 12 is welded to the front end of the right frame 11.

[0021] The rear frame 13 connects the rear end of the left frame 10 and the rear end of the right frame 11. The rear frame 13 is composed of a front plate 13A and a rear plate (not shown) that face each other in the front-rear direction, an upper plate 14 that closes the upper ends of the front plate 13A and the rear plate, and a lower plate 15 that closes the lower ends of the front plate 13A and the rear plate. The left end of the rear frame 13 is welded to the rear end of the left frame 10, and the right end of the rear frame 13 is welded to the rear end of the right frame 11.

[0022] The top plate 14 closes the upper ends of the left frame 10, right frame 11, front frame 12, and rear frame 13, and also connects the left frame 10 and the right frame 11. The rear side of the top plate 14 becomes a rear connection part 14A that connects the left frame 10 and the right frame 11, and the front side of the rear connection part 14A is a bifurcated branch 14B that closes the upper ends of the left frame 10 and the right frame 11. The front end of the branch 14B is connected by a front connection part 14C, and the front connection part 14C closes the upper end of the front frame 12.

[0023] The lower plate 15, facing the upper plate 14 in the vertical direction, closes the lower ends of the left frame 10, right frame 11, front frame 12, and rear frame 13, and also connects the left frame 10 and the right frame 11. Similar to the upper plate 14, the lower plate 15 is composed of a rear connecting portion 15A that connects the left frame 10 and the right frame 11, a bifurcated branching portion 15B that closes the lower ends of the left frame 10 and the right frame 11, and a front connecting portion (not shown) that closes the lower end of the front frame 12.

[0024] The left support column 16 and the right support column 17 are located slightly forward of the center of the vehicle frame 8 in the front-rear direction and face each other in the left-right direction. These left support column 16 and right support column 17 are hollow, sheet metal structures with a mountain-like shape. The left support column 16 protrudes upward from the branching portion 14B of the upper plate 14 that constitutes the left frame 10, and the right support column 17 protrudes upward from the branching portion 14B of the upper plate 14 that constitutes the right frame 11. The deck 32 is attached to the upper side of the left support column 16 and the right support column 17.

[0025] Left and right rear end brackets 18 are provided at the rear end of the main frame 9. The rear end brackets 18 protrude rearward from the rear connection portion 14A of the upper plate 14 that constitutes the left frame 10 and the right frame 11, respectively, and face each other in the left-right direction. These left and right rear end brackets 18 rotatably support the bottom surface of the cargo bed 5 via connecting pins 5A.

[0026] Left and right cylinder brackets 19 (only the left side is shown) are provided on the lower side of the middle section of the main frame 9 in the front-rear direction. These left and right cylinder brackets 19 protrude downward from the rear connection portion 15A and branch portion 15B of the lower plate 15 that constitutes the left frame 10 and the right frame 11, and face each other in the left-right direction. A cylinder support shaft 19A extending in the left-right direction is fixed to the protruding end of the cylinder bracket 19, and the lower end of the hoist cylinder 7 is rotatably attached to this cylinder support shaft 19A.

[0027] The frame bumper 20 is integrally fixed to the front side of the front frame 12 that constitutes the main frame 9. As shown in Figures 3 and 4, the frame bumper 20 has a front frame portion 20A that faces the front frame 12 in the front-rear direction and extends in the left-right direction, a left frame portion 20B that connects the left end of the front frame portion 20A and the left end of the front frame 12, and a right frame portion 20C that connects the right end of the front frame portion 20A and the right end of the front frame 12, and is formed as a frame that is bent in a U shape when viewed from above.

[0028] The frame bumper 20 is firmly joined to the front frame 12 using welding and is integrated with the main frame 9. The left frame portion 20B of the frame bumper 20 is continuous in the front-rear direction with the left frame 10 of the main frame 9 via the front frame 12, and the right frame portion 20C of the frame bumper 20 is continuous in the front-rear direction with the right frame 11 of the main frame 9 via the front frame 12. As a result, the load acting on the frame bumper 20 is smoothly transmitted to the left frame 10 and right frame 11 of the main frame 9, and the load can be appropriately distributed between the frame bumper 20 and the main frame 9. In addition, multiple mounting base seats 21 are provided on the upper surface of the frame bumper 20.

[0029] A total of six mounting bases 21 are provided, three on each of the upper surfaces of the left frame portion 20B and the right frame portion 20C that constitute the frame bumper 20, and the radiator mounting base 25, which will be described later, is attached to them. The mounting bases 21 consist of two rear mounting bases 22 located on the rear end side (front frame 12 side) of the frame bumper 20, two front mounting bases 23 located on the front end side of the frame bumper 20, and two intermediate mounting bases 24 located between the rear mounting bases 22 and the front mounting bases 23. These rear mounting bases 22, intermediate mounting bases 24, and front mounting bases 23 are arranged with uneven spacing in the front-to-back direction, and the front-to-back spacing A between the rear mounting bases 22 and the intermediate mounting bases 24 is set to be larger than the front-to-back spacing B between the front mounting bases 23 and the intermediate mounting bases 24 (see Figure 4).

[0030] These rear mounting base 22, front mounting base 23, and intermediate mounting base 24 are formed in the shape of identical rectangular flat plates and are fixed to the upper surfaces of the left frame portion 20B and right frame portion 20C of the frame bumper 20 by means of welding or other means. The upper surfaces of the rear mounting base 22, the front mounting base 23, and the intermediate mounting base 24 are flat mounting surfaces 22A, 23A, and 24A, respectively, and form the same plane with respect to each other. As a result, the height positions of the total of six mounting surfaces 22A, 23A, and 24A can be aligned, and when the radiator mounting base 25 is attached to the rear mounting base 22, the front mounting base 23, and the intermediate mounting base 24, all of the mounting surfaces 22A, 23A, and 24A are configured to contact the contact surface 25F of the radiator mounting base 25, which will be described later, without any gaps.

[0031] Female screw holes 22B are formed in the four corners of the rear mounting base 22, penetrating in the thickness direction. Similarly, female screw holes 23B are formed in the four corners of the front mounting base 23, and female screw holes 24B are formed in the four corners of the intermediate mounting base 24. The four female screw holes 22B of the rear mounting base 22, the four female screw holes 23B of the front mounting base 23, and the four female screw holes 24B of the intermediate mounting base 24 are set to be equally spaced in the front-rear and left-right directions. In this embodiment, the front-rear distance A between the rear mounting base 22 and the intermediate mounting base 24 is set to be greater than the front-rear distance B between the front mounting base 23 and the intermediate mounting base 24. Therefore, the female screw hole 22B of the rear mounting base 22 and the female screw hole 24B of the intermediate mounting base 24 are separated by a distance A, and the female screw hole 23B of the front mounting base 23 and the female screw hole 24B of the intermediate mounting base 24 are separated by a distance B.

[0032] The radiator mounting base 25, which serves as a mounting base for the equipment, is provided between the vehicle frame 8 and the radiator 30. The radiator mounting base 25 is attached to the frame bumper 20 of the vehicle frame 8 and fixes the radiator 30 to the vehicle frame 8 (see Figure 8). As shown in Figures 3 and 4, the radiator mounting base 25 is formed from a thick plate extending in the left-right direction and has a radiator mounting portion 25A located on the rear side in the front-rear direction and a scaffolding mounting portion 25B located in front of the radiator mounting portion 25A. The left-right width dimension C of the radiator mounting portion 25A is set to be larger than the left-right width dimension D of the scaffolding mounting portion 25B (C>D), and the radiator 30 is mounted there. The left-right width dimension D of the scaffolding mounting portion 25B is set to be equal to the left-right width dimension E of the frame bumper 20 (D≒E), and the scaffolding member 35, which will be described later, is mounted there.

[0033] Two mounting holes 25C are formed on each of the left and right ends of the radiator mounting section 25A. Mounting members 31, which will be described later, are attached to the mounting holes 25C, and the radiator 30 is elastically attached to the upper surface of the radiator mounting section 25A via the mounting members 31 (see Figure 8). On both the left and right sides of the scaffolding mounting section 25B, recessed sections 25D are formed adjacent to the front side of the radiator mounting section 25A. The left lower deck 37 and the right lower deck 39, which will be described later, are housed in the recessed sections 25D.

[0034] Multiple elongated grooves 26 (for example, 6 on each side, a total of 12) extending in the front-to-back direction are formed on both the left-to-right sides of the radiator mounting base 25. The multiple elongated grooves 26 consist of four rear elongated grooves 26A corresponding to the female screw holes 22B of the rear mounting base seat 22 of the frame bumper 20, four front elongated grooves 26B corresponding to the female screw holes 23B of the front mounting base seat 23 of the frame bumper 20, and four intermediate elongated grooves 26C corresponding to the female screw holes 24B of the intermediate mounting base seat 24 of the frame bumper 20.

[0035] As shown in Figure 3, the radiator mounting base 25 is fixed in the fixed position shown in Figure 5 by screwing bolts 27, which are fasteners inserted through the rear elongated groove hole 26A and the front elongated groove hole 26B, into the female threaded holes 22B of the rear mounting base 22 and the front mounting base 23. As a result, the radiator 30 mounted on the radiator mounting base 25 is positioned in the fixed position on the vehicle frame 8, which is behind the frame bumper 20 (see Figure 8). On the other hand, the radiator mounting base 25 is fixed in the maintenance position shown in Figure 6 by screwing bolts 27, which are inserted through the rear elongated groove hole 26A and the intermediate elongated groove hole 26C, into the female threaded holes 24B of the intermediate mounting base 24 and the front mounting base 23. As a result, the radiator 30 mounted on the radiator mounting base 25 is positioned in the maintenance position on the vehicle frame 8, which is in front of the frame bumper 20 (see Figure 9). When the radiator mounting base 25 is fixed in the maintenance position, the front of the radiator mounting base 25 extends forward beyond the front end of the frame bumper 20. This ensures that there is sufficient workspace behind the radiator 30 for maintenance work.

[0036] Thus, the radiator mounting base 25 has rear elongated groove holes 26A, front elongated groove holes 26B, and intermediate elongated groove holes 26C that extend in the front-rear direction, at positions corresponding to the female screw holes 22B, 23B, and 24B of the rear mounting base mounting seat 22, front mounting base mounting seat 23, and intermediate mounting base mounting seat 24 provided on the frame bumper 20. Therefore, even if the distance A between the rear mounting base mounting seat 22 (female screw hole 22B) and the intermediate mounting base mounting seat 24 (female screw hole 24B) is different from the distance B between the intermediate mounting base mounting seat 24 (female screw hole 24B) and the front mounting base mounting seat 23 (female screw hole 23B), the dimensional difference between distance A and distance B can be absorbed by the rear elongated groove holes 26A, front elongated groove holes 26B, and intermediate elongated groove holes 26C, and the radiator mounting base 25 can be fixed in the fixed position shown in Figure 5 and the maintenance position shown in Figure 6.

[0037] On the lower surface of the radiator mounting base 25, multiple (6) mounting seat housing sections 25E are formed in the areas corresponding to the rear elongated groove hole 26A, the front elongated groove hole 26B, and the intermediate elongated groove hole 26C. These mounting seat housing sections 25E are formed by cutting upwards into the lower surface of the radiator mounting base 25, creating rectangular recesses that are larger than the rear mounting base mounting seat 22, the front mounting base mounting seat 23, and the intermediate mounting base mounting seat 24 located on the frame bumper 20. The lower ends of the rear elongated groove hole 26A, the front elongated groove hole 26B, and the intermediate elongated groove hole 26C open into the mounting seat housing sections 25E. These mounting seat housing sections 25E have contact surfaces 25F that contact the mounting surface 22A of the rear mounting base 22, the mounting surface 23A of the front mounting base 23, and the mounting surface 24A of the intermediate mounting base 24. These six contact surfaces 25F form a single plane by machining or other means.

[0038] Therefore, when fixing the radiator mounting base 25 in place, the contact surfaces 25F of four of the six mounting seat housings 25E provided on the radiator mounting base 25 come into contact with the mounting surface 22A of the rear mounting base 22 and the mounting surface 23A of the front mounting base 23 without any gaps. In this state, the radiator mounting base 25 can be fixed in place by screwing a bolt 27 inserted through the rear elongated groove hole 26A into the female threaded hole 22B of the rear mounting base 22, and screwing a bolt 27 inserted through the front elongated groove hole 26B into the female threaded hole 23B of the front mounting base 23.

[0039] On the other hand, when fixing the radiator mounting base 25 to the maintenance position, the contact surfaces 25F of four of the six mounting seat housings 25E provided on the radiator mounting base 25 come into contact with the mounting surface 23A of the front mounting base mounting seat 23 and the mounting surface 24A of the intermediate mounting base mounting seat 24 without any gaps. In this state, the radiator mounting base 25 can be fixed to the maintenance position by screwing a bolt 27 inserted through the front elongated groove hole 26B into the female threaded hole 23B of the front mounting base mounting seat 23, and screwing a bolt 27 inserted through the intermediate elongated groove hole 26C into the female threaded hole 24B of the intermediate mounting base mounting seat 24.

[0040] A building 28 is provided at the front of the vehicle body 2. The building 28 is formed in the shape of a rectangular frame enclosed by left and right side panels and a top panel, and houses an engine 29 as the prime mover, a generator driven by the engine 29, a hydraulic pump, etc. (none of which are shown) inside the building 28. The engine 29 does not have, for example, an EGR system, and a radiator 30 for cooling the engine 29 is located at the very front of the building 28.

[0041] The radiator 30 is attached to the frame bumper 20 of the vehicle frame 8 via a radiator mounting base 25. The radiator 30, together with the scaffolding member 35 described later, constitutes equipment attached to the vehicle frame 8. The radiator 30 is elastically attached to the radiator mounting section 25A via a plurality (for example, four) of mounting members 31 attached to the mounting holes 25C of the radiator mounting base 25. Therefore, by fixing the radiator mounting base 25 in a fixed position (position in Figure 5), the radiator 30 can be positioned in a fixed position on the vehicle frame 8 (position in Figure 8). Also, by fixing the radiator mounting base 25 in a maintenance position (position in Figure 6), the radiator 30 can be positioned in a maintenance position on the vehicle frame 8 (position in Figure 9).

[0042] The radiator 30 is positioned in front of the engine 29, with its outer periphery surrounded by the building 28. A cooling fan 30A that draws in outside air is provided on the rear side of the radiator 30 (see Figure 8). The radiator 30 cools the engine coolant supplied to the engine 29 by exchanging heat with the outside air (cooling air) drawn into the building 28 by the cooling fan 30A.

[0043] A deck 32 is positioned above the building 28 (see Figure 1). The deck 32 is a flat plate extending horizontally and is supported by the building 28, the left support column 16 and the right support column 17 of the vehicle frame 8, etc. The deck 32 forms a flat walkway surface on top of the building 28, and handrails 32A are positioned around the deck 32. The cab 33, control cabinet 34, etc. are mounted on the deck 32. The cab 33 forms the driver's cabin where the operator etc. sits, and the cab 33 is equipped with a driver's seat, a start switch, a steering wheel, an accelerator pedal, a brake pedal, and operating levers (none of which are shown), etc. The control cabinet 34 consists of various control devices, including an inverter (not shown) that controls the electric motor of the running gear 6.

[0044] A scaffolding member 35 is positioned in front of the radiator 30. As shown in Figure 7, the scaffolding member 35 consists of an access staircase 36, a lower left deck 37, a left ladder 38, a lower right deck 39, and a right ladder 40, forming a platform for operators and others to move between the deck 32 and the ground.

[0045] The staircase 36 extends diagonally upward from the lower right to the upper left of the radiator 30, crossing in front of the radiator 30. The lower end of the staircase 36 is attached to the right end of the scaffolding attachment part 25B that constitutes the radiator fixing base 25. A landing 36A is provided at the upper end of the staircase 36, and the landing 36A is attached to the upper left end of the building 28 using support members (not shown), etc. The staircase 36 is also provided with a handrail 36B for operators and others using the staircase 36 to grasp.

[0046] The lower left deck 37 is positioned on the left front side of the radiator 30. The lower left deck 37 is attached to the left end of the scaffolding mounting section 25B while engaged with a recessed portion 25D formed on the left front side of the radiator mounting base 25. The lower left deck 37 has multiple steps (treads) 37A and forms a scaffolding between the ground and the left ladder 38. Here, the amount of protrusion of the lower left deck 37 from the vehicle frame 8 (frame bumper 20) to the left is suppressed by engaging with the recessed portion 25D provided in the radiator mounting base 25.

[0047] The left-side ladder 38 is positioned between the landing 36A of the staircase 36 and the lower left deck 37. The left-side ladder 38 rises vertically upward from the lower left deck 37, its lower end is attached to the lower left deck 37, and its upper end is attached to the landing 36A of the staircase 36.

[0048] The lower right deck 39 is positioned to the right front of the radiator 30. The lower right deck 39 is attached to the right end of the scaffolding mounting section 25B while engaged with a recessed portion 25D formed on the right front side of the radiator mounting base 25. The lower right deck 39 has multiple steps 39A and forms a scaffolding between the ground and the right-side ladder 40. Here, the amount of protrusion of the lower right deck 39 to the right from the vehicle frame 8 (frame bumper 20) is suppressed by engaging with the recessed portion 25D provided in the radiator mounting base 25.

[0049] The right-side ladder 40 extends vertically upward from the lower right deck 39 along the front of the radiator 30. The lower end of the right-side ladder 40 is attached to the scaffolding attachment part 25B of the radiator fixing base 25, and the upper end of the right-side ladder 40 is attached to the upper right end of the building 28 using a support member (not shown) or the like.

[0050] In this embodiment, the radiator 30 and scaffolding member 35, which are components attached to the vehicle frame 8, are attached to the radiator fixing base 25, so that a radiator assembly 41 can be formed in which the radiator fixing base 25, radiator 30, and scaffolding member 35 are integrally assembled, as shown in Figure 7. This configuration allows for efficient installation of the radiator 30, scaffolding member 35, etc., to the vehicle frame 8 by first assembling the radiator assembly 41 and then attaching the radiator fixing base 25 of the radiator assembly 41 to the fixing base mounting seat 21 of the frame bumper 20.

[0051] The dump truck 1 according to this embodiment has the configuration described above. When using the dump truck 1 to transport crushed stone from a mine or the like, an operator riding in the cab 33 starts the engine 29. The engine 29 then drives a generator, a hydraulic pump, etc. (none of which are shown), and the electricity from the generator is supplied to the electric motor of the running gear 6, which rotates the rear wheels 4, allowing the dump truck 1 to travel to the crushing site.

[0052] At the quarry, crushed stone excavated using a large hydraulic excavator (not shown) is loaded onto the cargo bed 5 of dump truck 1. After the dump truck 1 loaded with crushed stone travels to the collection area, the cargo bed 5 is tilted by the hoist cylinder 7 to discharge the crushed stone to the collection area. When dump truck 1 is in operation, cooling air is introduced into the building 28 by the cooling fan 30A of the radiator 30, and the radiator 30 performs heat exchange between the cooling air introduced into the building 28 and the engine coolant. This cools the engine 29 and other components, allowing dump truck 1 to operate smoothly.

[0053] In this embodiment, the dump truck 1 is provided with a radiator mounting base 25 between the frame bumper 20 and the radiator 30 that constitute the vehicle body frame 8, and with a plurality of mounting base seats 21 on the frame bumper 20, thereby improving the workability when fixing the radiator 30 to the fixed position on the vehicle body frame 8. The following describes the work of fixing the radiator 30 to the fixed position.

[0054] First, multiple mounting members 31 are attached to the mounting holes 25C of the radiator mounting base 25, and the radiator 30 is attached to the radiator mounting portion 25A of the radiator mounting base 25 via these multiple mounting members 31. This allows the radiator 30 to be elastically attached to the radiator mounting base 25 (radiator mounting portion 25A) via the multiple mounting members 31.

[0055] Next, the climbing stairs 36, lower left deck 37, left ladder 38, lower right deck 39, and right ladder 40, which constitute the scaffolding member 35, are attached to the scaffolding mounting portion 25B of the radiator mounting base 25. As a result, as shown in Figure 7, the radiator assembly 41, consisting of the radiator mounting base 25, radiator 30, and scaffolding member 35, can be assembled independently of the vehicle frame 8.

[0056] Next, the radiator assembly 41 is lifted using a crane (not shown) or the like and lowered onto the frame bumper 20 of the vehicle frame 8. When positioning the radiator 30 in the designated location on the vehicle frame 8 as shown in Figure 8, as shown in Figure 5, the contact surfaces 25F of the two mounting seat housings 25E provided on the rear side of the radiator fixing base 25 are brought into contact with the mounting surface 22A of the rear fixing base mounting seat 22 of the frame bumper 20, and the contact surfaces 25F of the two mounting seat housings 25E provided on the front side of the radiator fixing base 25 are brought into contact with the mounting surface 23A of the front fixing base mounting seat 23 of the frame bumper 20.

[0057] In this case, the mounting surface 22A of the rear mounting base 22 and the mounting surface 23A of the front mounting base 23 form the same plane, and the contact surfaces 25F of the multiple mounting base housings 25E provided on the radiator mounting base 25 form the same plane with respect to each other. Therefore, the mounting surface 22A of the rear mounting base 22 and the mounting surface 23A of the front mounting base 23 both contact the contact surfaces 25F of the radiator mounting base 25 (mounting base housings 25E) without any gaps, and the radiator 30 can be stably positioned on the rear mounting base 22 and front mounting base 23 of the frame bumper 20. Therefore, it is not necessary to insert shims or the like between the rear mounting base 22 and front mounting base 23 of the frame bumper 20 and the four contact surfaces 25F of the radiator mounting base 25 to adjust the gap.

[0058] In this way, after positioning the radiator mounting base 25, to which the radiator 30 and the like are attached, on the rear mounting base mounting seat 22 and the front mounting base mounting seat 23 of the frame bumper 20, a bolt 27 inserted through the rear elongated groove hole 26A of the radiator mounting base 25 is screwed into the female threaded hole 22B of the rear mounting base mounting seat 22, and a bolt 27 inserted through the front elongated groove hole 26B is screwed into the female threaded hole 23B of the front mounting base mounting seat 23. At this time, the position of the radiator mounting base 25 relative to the frame bumper 20 can be finely adjusted within the range of the rear elongated groove hole 26A and the front elongated groove hole 26B through which the bolt 27 is inserted. In this way, the radiator 30 and the scaffolding member 35 can be easily fixed to the vehicle frame 8 in the fixed position shown in Figure 8.

[0059] On the other hand, in the dump truck 1 according to this embodiment, when performing maintenance on the radiator 30, for example, the mounting position of the radiator assembly 41 on the vehicle frame 8 can be moved from the fixed position shown in Figure 8 to the maintenance position shown in Figure 9. The following describes the process of moving the radiator assembly 41 from the fixed position to the maintenance position.

[0060] First, with ropes (not shown) lifted by a crane wrapped around the radiator assembly 41, the bolts 27 screwed into the rear mounting base 22 and front mounting base 23 of the frame bumper 20 are removed. In this state, the radiator assembly 41 is lifted by the crane, and the mounting base housing portion 25E of the radiator mounting base 25 is detached from the rear mounting base 22, front mounting base 23, and intermediate mounting base 24 of the frame bumper 20.

[0061] Next, the lifted radiator assembly 41 is moved forward, and the contact surfaces 25F of the two mounting seat housings 25E located on the rear side of the radiator mounting base 25 are brought into contact with the mounting surface 24A of the intermediate mounting base 24 of the frame bumper 20. At the same time, the contact surfaces 25F of the two mounting seat housings 25E located in the middle of the radiator mounting base 25 in the front-to-rear direction are brought into contact with the mounting surface 23A of the front mounting base 23 of the frame bumper 20. In this state, the bolt 27 inserted through the rear elongated groove hole 26A of the radiator mounting base 25 is screwed into the female threaded hole 24B of the intermediate mounting base 24, and the bolt 27 inserted through the intermediate elongated groove hole 26C is screwed into the female threaded hole 23B of the front mounting base 23.

[0062] Thus, even if the distance A between the rear mounting base 22 (female screw hole 22B) and the intermediate mounting base 24 (female screw hole 24B) is different from the distance B between the intermediate mounting base 24 (female screw hole 24B) and the front mounting base 23 (female screw hole 23B), the radiator mounting base 25 can be moved and fixed from the fixed position shown in Figure 5 to the maintenance position shown in Figure 6 by absorbing the dimensional difference between distance A and distance B with the rear elongated groove hole 26A, the front elongated groove hole 26B, and the intermediate elongated groove hole 26C. Furthermore, the position of the radiator mounting base 25 relative to the frame bumper 20 can be finely adjusted within the range of the rear elongated groove hole 26A and the intermediate elongated groove hole 26C through which the bolts 27 are inserted.

[0063] In this way, by moving the radiator mounting base 25 from its fixed position to the maintenance position, the front part of the radiator mounting base 25 extends forward beyond the front end of the vehicle frame 8 (frame bumper 20). As a result, the entire radiator assembly 41 moves forward, and a large working space is secured behind the radiator 30, thereby improving the workability when performing maintenance on the radiator 30 and other components.

[0064] Thus, in the dump truck 1 according to this embodiment, the radiator 30 can be fixed in a fixed position (position in Figure 8) by fixing the radiator mounting base 25, to which the radiator 30 is attached, to the rear mounting base mounting seat 22 and the front mounting base mounting seat 23. Furthermore, the radiator 30 can be fixed in a maintenance position (position in Figure 9) by fixing the radiator mounting base 25 to the front mounting base mounting seat 23 and the intermediate mounting base mounting seat 24. In this way, by selectively attaching the radiator mounting base 25 to a plurality of mounting base mounting seats 21 (rear mounting base mounting seat 22, front mounting base mounting seat 23, intermediate mounting base mounting seat 24) provided on the vehicle frame 8, the radiator 30 can be attached to different positions on the vehicle frame 8. As a result, the workability when performing maintenance on the radiator 30 and the workability when placing the radiator 30 in its fixed position after maintenance can be improved.

[0065] Next, Figure 10 shows a radiator mounting base 42 according to a second embodiment of the present invention. The radiator mounting base 42 is provided between the vehicle frame 8 and the radiator 43 when a larger radiator 43 than the radiator 30 illustrated in the first embodiment is used. In this case, the radiator 43 is larger than the radiator 30 illustrated in the first embodiment, and its width in the left-right direction is larger, for example, to cool an engine (not shown) equipped with an EGR (exhaust gas recirculation) system. In the second embodiment, the same reference numerals are used for the same components as in the first embodiment, and their descriptions are omitted.

[0066] The radiator mounting base 42 according to the second embodiment is formed from a thick plate extending in the left-right direction, similar to the radiator mounting base 25 according to the first embodiment, and has a radiator mounting portion 42A located on the rear side in the front-rear direction, and a scaffolding mounting portion 42B located in front of the radiator mounting portion 42A. Here, the left-right width dimension of the radiator mounting portion 42A is set to be larger than that of the radiator mounting portion 25A of the radiator mounting base 25 according to the first embodiment, and the left-right width dimension of the scaffolding mounting portion 42B is set to be equal to that of the scaffolding mounting portion 25B of the radiator mounting base 25 according to the first embodiment.

[0067] Mounting holes 42C for attaching the mounting member 31 are formed at both the left and right ends of the radiator mounting portion 42A. Recessed portions 42D for accommodating the left lower deck 37 and the right lower deck 39 of the scaffolding member 35 are provided on both the left and right sides of the scaffolding mounting portion 42B. On both the left and right sides of the radiator fixing base 42, there are four rear elongated groove holes 26A corresponding to the female screw holes 22B of the rear fixing base mounting seat 22 provided on the frame bumper 20, four front elongated groove holes 26B corresponding to the female screw holes 23B of the front fixing base mounting seat 23, and four intermediate elongated groove holes 26C corresponding to the female screw holes 24B of the intermediate fixing base mounting seat 24.

[0068] On the lower surface of the radiator mounting base 42, mounting seat housing portions 42E are formed in the areas corresponding to the rear elongated groove hole 26A, the front elongated groove hole 26B, and the intermediate elongated groove hole 26C. These mounting seat housing portions 42E have contact surfaces 42F that abut against the mounting surface 22A of the rear mounting base mounting seat 22, the mounting surface 23A of the front mounting base mounting seat 23, and the mounting surface 24A of the intermediate mounting base mounting seat 24. These contact surfaces 42F form a single plane by machining or other means.

[0069] The radiator mounting base 42 according to the second embodiment has the configuration described above. When attaching the radiator 43 to the vehicle frame 8, the radiator 43 is attached to the radiator mounting portion 42A of the radiator mounting base 42, and the scaffolding member 35 is attached to the scaffolding mounting portion 42B, thereby assembling the radiator assembly (not shown), similar to the first embodiment.

[0070] Next, the radiator assembly is lifted using a crane (not shown) or the like and lowered onto the frame bumper 20 of the vehicle frame 8. Specifically, the contact surfaces 42F of the two mounting seat housings 42E provided on the rear side of the radiator mounting base 42 are brought into contact with the mounting surface 22A of the rear mounting base mounting seat 22 of the frame bumper 20, and the contact surfaces 42F of the two mounting seat housings 42E provided on the front side of the radiator mounting base 42 are brought into contact with the mounting surface 23A of the front mounting base mounting seat 23 of the frame bumper 20. In this state, the bolts 27 inserted through the rear elongated groove holes 26A of the radiator mounting base 42 are screwed into the female threaded holes 22B of the rear mounting base mounting seat 22, and the bolts 27 inserted through the front elongated groove holes 26B are screwed into the female threaded holes 23B of the front mounting base mounting seat 23. This allows the radiator 43 and the scaffolding member 35 to be fixed in place on the vehicle frame 8 via the radiator fixing base 42.

[0071] In this embodiment as well, the radiator mounting base 42 can be selectively attached to multiple mounting base mounting seats 21 (rear mounting base mounting seat 22, front mounting base mounting seat 23, intermediate mounting base mounting seat 24) provided on the vehicle frame 8 (frame bumper 20), thereby allowing the radiator 43 to be mounted at different positions on the vehicle frame 8. As a result, the ease of maintenance on the radiator 43 and the ease of placing the radiator 43 back into its designated position after maintenance can be improved.

[0072] Furthermore, the mounting surface 22A of the rear mounting base mounting seat 22 and the mounting surface 23A of the front mounting base mounting seat 23, both provided on the vehicle frame 8 (frame bumper 20), form the same plane, and the contact surfaces 25F of the multiple mounting base housings 25E provided on the radiator mounting base 42 form the same plane with respect to each other. As a result, the mounting surface 22A of the rear mounting base mounting seat 22 and the mounting surface 23A of the front mounting base mounting seat 23 both contact the contact surface 25F of the radiator mounting base 42 (mounting base housings 25E) without any gaps. Therefore, the radiator 43 can be stably positioned on the rear mounting base mounting seat 22 and the front mounting base mounting seat 23 without having to perform any work such as inserting shims or the like between the rear mounting base mounting seat 22 and the front mounting base mounting seat 23 of the frame bumper 20 and the contact surface 25F of the radiator mounting base 42.

[0073] In this way, without replacing the vehicle frame 8, a larger radiator 43 than the radiator 30 used in the first embodiment can be mounted on the vehicle frame 8 simply by replacing the radiator mounting base 25 used in the first embodiment with a radiator mounting base 42. In other words, by using a radiator mounting base corresponding to the type of radiator to be mounted, the vehicle frame 8 can be standardized. As a result, the cost of manufacturing dump trucks equipped with engines and radiators with different specifications can be reduced, and changes to new specifications for dump trucks can be easily made.

[0074] Thus, in this embodiment, a dump truck comprises a vehicle frame 8 extending in the front-rear direction to which left and right front wheels 3 and rear wheels 4 are attached, a cargo bed 5 tiltably provided with respect to the vehicle frame 8 for loading cargo, and equipment attached to the vehicle frame 8, wherein a radiator mounting base 25(42) is provided between the vehicle frame 8 and the equipment for fixing the equipment to the vehicle frame 8, and the vehicle frame 8 is integrally provided with a plurality of mounting base seats 21 (rear mounting base seat 22, front mounting base seat 23, intermediate mounting base seat 24) configured to attach the radiator mounting base 25(42), and the radiator mounting base 25(42) is configured to be selectively attached to the plurality of mounting base seats 21 depending on the mounting position of the equipment to the vehicle frame 8.

[0075] With this configuration, the radiator mounting base 25(42) can be selectively attached to multiple mounting base mounting seats 21 (rear mounting base mounting seat 22, front mounting base mounting seat 23, intermediate mounting base mounting seat 24) provided on the vehicle frame 8, allowing the radiator 30(43) to be mounted at different positions on the vehicle frame 8. As a result, the workability for maintenance of the radiator 30(43) and for placing the radiator 30(43) back into its designated position after maintenance can be improved.

[0076] In this embodiment, the radiator mounting base 25(42) is fixed to the mounting base seat 21 using bolts 27, and a long grooved hole 26 extending in the front-rear direction is provided in the radiator mounting base 25(42) at a position corresponding to the mounting base seat 21 through which the bolts 27 are inserted. With this configuration, even if, for example, the distance between the rear mounting base seat 22 and the intermediate mounting base seat 24 that constitute the mounting base seat 21 is different from the distance between the intermediate mounting base seat 24 and the front mounting base seat 23, the difference in dimensions between these two distances can be absorbed by the long grooved hole 26 extending in the front-rear direction. As a result, equipment can be fixed to different positions in the front-rear direction (for example, a fixed position and a maintenance position) using the radiator mounting base 25(42).

[0077] In this embodiment, the multiple mounting base seats 21 (rear mounting base seat 22, front mounting base seat 23, intermediate mounting base seat 24) each have mounting surfaces 22A, 23A, and 24A that form a single plane with respect to each other, and the radiator mounting base 25(42) is mounted on one of the mounting surfaces 22A, 23A, or 24A of the mounting base seats 21. With this configuration, there is no gap between the radiator mounting base 25(42) and the mounting base seats 21, so the radiator mounting base 25(42) can be stably attached to the vehicle frame 8.

[0078] In this embodiment, multiple types of radiator mounting bases 25(42), corresponding to the type of radiator 30(43), are attached to one of the multiple mounting base mounting seats 21 (rear mounting base mounting seat 22, front mounting base mounting seat 23, intermediate mounting base mounting seat 24) on the vehicle frame 8. With this configuration, different types of radiators 30(43) can be attached to the vehicle frame 8 by attaching the radiator mounting bases 25(42) to the multiple mounting base mounting seats 21 (rear mounting base mounting seat 22, front mounting base mounting seat 23, intermediate mounting base mounting seat 24) provided on the vehicle frame 8.

[0079] In this embodiment, the vehicle frame 8 is equipped with an engine 29 that serves as a power source for driving the rear wheels 4. The equipment includes a radiator 30(43) positioned in front of the engine 29 to cool it, and a scaffolding member 35 positioned in front of the radiator 30(43) and extending vertically along the radiator 30(43). The radiator mounting base 25(42) includes a radiator mounting section 25A(42A) to which the radiator 30(43) is attached, and a scaffolding mounting section 25B(42B) to which the scaffolding member 35 is attached. With this configuration, by assembling the radiator 30(43) and the scaffolding member 35 onto the radiator mounting base 25(42), a separate assembly (radiator assembly 41) can be pre-assembled from the vehicle frame 8. As a result, by attaching the radiator fixing base 25(42) that constitutes the assembly to the vehicle frame 8, the workability when attaching the radiator 30(43) and scaffolding member 35 to the vehicle frame 8 can be improved.

[0080] In this embodiment, the scaffolding mounting portion 25B(42B) of the radiator mounting base 25(42) is set to have a smaller width dimension in the left-right direction than the radiator mounting portion 25A(42A), and recessed portions 25D(42D) are formed on both the left-right sides of the scaffolding mounting portion 25B(42B) to accommodate a part of the scaffolding member 35 (the left lower deck 37 and the right lower deck 39). With this configuration, when the scaffolding member 35 is assembled to the radiator mounting base 25(42) together with the radiator 30(43), it is possible to prevent the left lower deck 37 and the right lower deck 39 of the scaffolding member 35 from protruding from the radiator mounting base 25(42) in the left-right direction.

[0081] In this embodiment, the radiator fixing base 25(42) is attached to a fixed position on the vehicle frame 8 for fixing the radiator 30(43) in a fixed position, and to a maintenance position for fixing the radiator 30(43) when performing maintenance on the radiator 30(43). When the radiator fixing base 25(42) is attached to the maintenance position, the radiator fixing base 25(42) extends forward beyond the front end of the vehicle frame 8. With this configuration, the radiator 30(43) and the scaffolding member 35 attached to the radiator fixing base 25(42) move together to the front of the vehicle frame 8. As a result, a large working space is secured behind the radiator 30(43), thereby improving work efficiency when performing maintenance on the radiator 30(43), etc.

[0082] In this embodiment, an example is given where the front-to-back distance A between the rear mounting base 22 and the intermediate mounting base 24 that constitute the mounting base 21 is different from the front-to-back distance B between the front mounting base 23 and the intermediate mounting base 24. However, the present invention is not limited to this, and for example, the front-to-back distance between the rear mounting base and the intermediate mounting base may be set to be equal to the front-to-back distance between the front mounting base and the intermediate mounting base.

[0083] Furthermore, in the embodiment, an example is shown in which the mounting base seats 21 (rear mounting base seat 22, front mounting base seat 23, and intermediate mounting base seat 24) are provided on the upper surfaces of the left frame portion 20B and the right frame portion 20C that constitute the frame bumper 20 of the vehicle body frame 8. However, the present invention is not limited to this, and for example, a configuration in which multiple mounting base seats are provided on the sides of the left frame portion 20B and the right frame portion 20C may also be used. [Explanation of Symbols]

[0084] 1 Dump truck 3 Front wheels 4 Rear wheels 5. Cargo bed 8. Vehicle frame 21 Mounting base 22 Rear mounting base 23 Front mounting base 24 Intermediate mounting base 22A, 23A, 24A mounting surface 25,42 Radiator mounting stand (equipment mounting stand) 25A, 42A radiator mounting section 25B, 42B Scaffolding attachment section 25D,42D recess 26 Long groove holes 26A Rear long slot 26B Front long slot 26C Intermediate long slot 27 Bolts (fasteners) 29. Engine (prime mover) 30,43 Radiators (equipment) 35 Scaffolding components (equipment)

Claims

1. A body frame that extends in the front-to-back direction and to which the left and right wheels are attached, A cargo bed for loading cargo is provided so as to be tiltable relative to the vehicle frame, A dump truck comprising equipment attached to the aforementioned vehicle frame, Between the vehicle frame and the equipment, equipment mounting bases are provided for fixing the equipment to the vehicle frame. The vehicle frame is integrally provided with a plurality of mounting bases configured to attach the equipment mounting base, The dump truck is characterized in that the equipment mounting base has a configuration that allows it to be selectively attached to a plurality of mounting base seats depending on the mounting position of the equipment on the vehicle frame.

2. The equipment mounting base is fixed to the mounting base using fasteners, The dump truck according to claim 1, characterized in that a long groove hole extending in the front-rear direction through which the fastener is inserted is provided at a position in the equipment fixing base corresponding to the fixing base mounting seat.

3. Each of the aforementioned mounting bases has a mounting surface that forms a single plane with respect to the equipment mounting base, and is configured such that the equipment mounting base is attached to it. The dump truck according to claim 1, characterized in that the equipment mounting base is attached to the mounting surface of one of the plurality of mounting bases.

4. The dump truck according to claim 1, characterized in that a plurality of types of equipment mounting bases, corresponding to the types of equipment, are attached to one of the plurality of mounting bases on the vehicle frame.

5. The vehicle frame is equipped with a prime mover that serves as a power source for driving the wheels. The aforementioned equipment comprises a radiator positioned in front of the prime mover to cool the prime mover, and a scaffolding member positioned in front of the radiator and extending vertically along the radiator. The dump truck according to claim 1, characterized in that the equipment mounting base comprises a radiator mounting portion to which the radiator is attached and a scaffolding mounting portion to which the scaffolding member is attached.

6. The scaffolding mounting portion of the equipment mounting base is set to have a smaller width in the left-right direction than the radiator mounting portion. The dump truck according to claim 5, characterized in that recessed portions for accommodating a part of the scaffolding member are formed on both the left and right sides of the scaffolding mounting portion.

7. The equipment mounting base is attached to a fixed position on the vehicle frame for fixing the equipment, and to a maintenance position for fixing the equipment when performing maintenance on the equipment. The dump truck according to claim 1, characterized in that when the equipment mounting base is installed in the maintenance position, the equipment mounting base extends forward beyond the front end of the vehicle frame.

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