Dumper

Abstract

The vehicle body frame (16) comprises: a left frame (18); a right frame (19); a front frame (20) that connects the front end of the left frame (18) and the front end of the right frame (19); and a front bumper (28) which is fixed to the front side of the front frame (20), is provided with a hook (28D) for hoisting, and has equipment (a radiator (11), a radiator (42), and a pantograph holder (55)) mounted thereon. The front bumper (28) is provided with a pedestal fixing part (29), and the pedestal fixing part (29) selectively fixes a plurality of types of equipment installation pedestals (30), (44) and (56)) corresponding to the types of equipment (a radiator (11), a radiator (42) and a pantograph support (55)).

Description

Technical Field

[0001] The present disclosure relates to a dump truck suitable for use in handling crushed rock, such as that found in a mine. Background Art

[0002] A dump truck for transporting crushed rocks and the like mined in a mine is configured to include: a body frame on which wheels are mounted, a loading platform provided in a swingable manner relative to the body frame, an engine located in front of the loading platform and mounted on the body frame, and a cab located above the engine and mounted on the body frame (Patent Document 1). In addition, a radiator is mounted on the front end of the body frame, and the engine (engine cooling water) is cooled by the radiator.

[0003] Dump trucks are set up with various options to match the environment in which they are used and the needs of customers. For example, in areas with high altitudes, dump trucks with special specifications and high cooling performance are used instead of dump trucks with standard specifications and radiators. In addition, at mining sites such as large-scale mines, overhead wire dump trucks are used, which use electricity supplied through overhead wires (overhead wires) to drive the electric motor for driving. These overhead wire dump trucks are equipped with a pantograph (collection device) that collects electricity from the overhead wires.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Publication No. 2012-218605 Summary of the invention

[0007] Problems to be solved by the invention

[0008] The body frame of a dump truck is generally composed of a main frame on which a loading platform, an engine, a cab, etc. are installed, and a front bumper installed on the front end side of the main frame. The above-mentioned standard specification radiator, special specification radiator, and pantograph are mounted on the front bumper. Therefore, when different types of equipment such as a standard specification radiator, a special specification radiator, and a pantograph are installed, a method of mounting the front bumper corresponding to each type of equipment on the front end side of the main frame using fasteners or the like is considered.

[0009] However, a hook for lifting the vehicle body is usually provided on the front bumper, and a rope is hooked and fixed to the hook, and the dump truck is lifted using a crane or the like. When the dump truck is lifted, a large load acts on the joint between the front bumper provided with the hook and the main frame. Therefore, when the front bumper corresponding to the type of equipment is mounted on the main frame in a replaceable manner, it is difficult to ensure sufficient strength at the joint between the front bumper and the main frame.

[0010] On the other hand, for example, when a front bumper corresponding to a device is fixed to the front end side of the main frame in a non-replaceable manner, or when the front bumper is fixed in a complicated manner according to the model, a dedicated body frame corresponding to the specifications of the dump truck is required. As a result, there is a problem that it is difficult to make the body frame universal and it is difficult to easily change the specifications of the dump truck.

[0011] An object of the present invention is to provide a dump truck in which a vehicle body frame can be made common regardless of the type of equipment mounted thereon.

[0012] The dump truck of the present invention is constructed to include: a body frame on which wheels are mounted; and a loading platform, which is arranged in a manner that can be tilted and moved relative to the body frame and loads the transported objects, and the body frame is constructed to include: a left frame, which is arranged on the left side in the left-right direction and extends in the front-back direction; a right frame, which is arranged on the right side in the left-right direction and extends in the front-back direction; a front frame, which connects the front end of the left frame with the front end of the right frame and extends in the left-right direction; and a front bumper, which is fixed to the front side of the front frame, is provided with a hook for lifting, and is equipped with equipment. The dump truck is characterized in that the front bumper has a pedestal fixing portion, which selectively fixes a plurality of equipment mounting pedestals corresponding to the types of equipment.

[0013] According to the present invention, a plurality of device mounting pedestals corresponding to the types of devices mounted on the front bumper can be selectively fixed to the pedestal fixing portion of the front bumper. Thus, a plurality of devices of different types can be mounted on the front bumper using the device mounting pedestals. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a left side view of the dump truck of the standard specification which shows the first embodiment.

[0015] Figure 2 This is a front view of a standard dump truck.

[0016] Figure 3 This is a three-dimensional diagram showing the vehicle body frame as a single body.

[0017] Figure 4 This is an exploded perspective view showing a state where a standard radiator is mounted on the front bumper.

[0018] Figure 5 It is a left side view of a dump truck of a special specification showing the second embodiment.

[0019] Figure 6 It is a front view of a special specification dump truck.

[0020] Figure 7This is an exploded perspective view showing a state where a radiator of special specifications is mounted on the front bumper.

[0021] Figure 8 It is a left side view of the dump truck of the overhead wire specification which shows the third embodiment.

[0022] Fig. 9 This is a front view of a dump truck with overhead wire specifications.

[0023] Fig.10 This is an exploded perspective view showing a state where a pantograph bracket is mounted on a front bumper. DETAILED DESCRIPTION

[0024] Hereinafter, an embodiment of the dump truck of the present invention will be described in detail with reference to the accompanying drawings. In the embodiment, the traveling direction of the dump truck is the front-rear direction, and the direction orthogonal to the traveling direction is described as the left-right direction.

[0025] Figures 1 to 4 A standard dump truck 1 according to a first embodiment of the present invention is shown. The standard dump truck 1 is equipped with a standard radiator 11 to be described later.

[0026] In the figure, a dump truck 1 is configured to include: a self-propelled vehicle body 2 having left and right front wheels 3 and left and right rear wheels 4; and a loading platform 5 (described later) mounted on the vehicle body 2 in a manner that allows tilting (up and down). The dump truck 1 loads the transported objects such as crushed stones mined in a mine on the loading platform 5 for transport. The vehicle body 2 of the dump truck 1 is configured to include a cabin 7 (described later), a floor 8, a cab 9, a vehicle body frame 16, etc.

[0027] The left and right front wheels 3 are rotatably provided on the front side of the vehicle body 2, and constitute steering wheels. The front wheels 3 are supported on the vehicle body frame 16 via a front wheel side suspension (not shown), and the vibration transmitted from the front wheels 3 to the vehicle body 2 is mitigated. The left and right rear wheels 4 are rotatably provided on the rear side of the vehicle body 2, and are rotationally driven by a travel device (not shown) having an electric motor. The travel device of the rear wheel 4 is supported on the vehicle body frame 16 via a rear wheel side suspension (not shown), and the vibration transmitted from the rear wheel 4 to the vehicle body 2 is mitigated.

[0028] The loading platform (tank) 5 is mounted on the vehicle body frame 16 in a manner that allows tilting movement (can rise and fall). The loading platform 5 is formed as a large bottomed container for loading a large amount of minerals mined by a hydraulic excavator (not shown), for example. The rear bottom of the loading platform 5 is connected to the rear end brackets 26 (described later) provided on the vehicle body frame 16 via a connecting pin 5B in a manner that allows tilting movement. An eaves 5A extending horizontally from the upper part thereof toward the front is integrally provided on the front side of the loading platform 5. The eaves 5A of the loading platform 5 extends to the front end side of the floor plate 8 in a state that covers the cab 9 (described later) from the upper side.

[0029] The lifting cylinders 6 are provided in pairs in the left-right direction between the vehicle body frame 16 and the loading platform 5 (only the left side is shown in the figure). The lifting cylinders 6 are composed of, for example, hydraulic cylinders, and tilt the front side of the loading platform 5 up and down relative to the vehicle body frame 16. One end side (lower end side) of the lifting cylinder 6 is rotatably mounted on a cylinder support shaft 27A described later, and the other end side (upper end side) of the lifting cylinder 6 is rotatably mounted on the lower surface side of the loading platform 5. Therefore, by extending or contracting the lifting cylinders 6, the front side (eaves 5A side) of the loading platform 5 rotates (rises and falls) in the up-and-down direction with the connecting pin 5B as a fulcrum. As a result, the loading platform 5 tilts to the soil discharge position where the front side is lifted upward, and the transported objects loaded on the loading platform 5 can be discharged.

[0030] The cabin 7 is provided at the front side of the vehicle body 2. The cabin 7 is formed into a rectangular frame shape surrounded by left and right side panels and an upper panel, and the engine, generator, hydraulic pump and other mounted equipment (none of which is shown) are accommodated inside the cabin 7. In addition, the cabin 7 also has a function of supporting the floor panel 8 and the like from the lower side together with the left support 24 and the right support 25 of the vehicle body frame 16 described later.

[0031] The floor 8 is located on the upper side of the left pillar 24, the right pillar 25 and the cabin 7 of the vehicle body frame 16, which is located in front of the loading platform 5. The floor 8 is formed into a rectangular flat plate shape that is long in the left-right direction, and is supported from the lower side by an upper cross beam (not shown) installed between the upper ends of the left pillar 24 and the right pillar 25 of the vehicle body frame 16 and the cabin 7. The floor 8 is arranged above the left and right front wheels 3 and extends in the horizontal direction. The cab 9, the control cabinet 10, etc. are mounted on the floor 8. In addition, the upper surface of the floor 8 is a flat passage surface for the operator and the like to pass through, and the outer periphery of the floor 8 is surrounded by a plurality of handrails 8A.

[0032] The cab 9 is provided on the bottom plate 8 in a state covered from the upper side by the eaves 5A of the loading platform 5. The cab 9 forms a driving compartment for the operator of the dump truck 1 to get on and off, and a driver's seat, an accelerator pedal, a brake pedal, a steering wheel for steering, and a plurality of operating levers (none of which are shown) are provided inside the cab 9.

[0033] The standard radiator 11 is an example of a device mounted on a front bumper 28 described later. Figure 4As shown, the radiator 11 includes a rectangular frame 12 and a heat exchanger body (not shown) disposed inside the radiator frame 12. The radiator 11 cools engine cooling water and the like of an engine (not shown) accommodated in the cabin 7. Mounting legs 12A are provided at the lower ends of the left and right sides of the radiator frame 12, respectively. A plurality of (e.g., two) assembly members 13 are provided adjacent to each other in the front-rear direction on the left and right mounting legs 12A, respectively, and these assembly members 13 are mounted on a device mounting base 30 described later.

[0034] Protective plates 14 extending from left and right side panels of the cabin 7 are provided on the left and right sides of the radiator 11. Air filters 15 are mounted on the left and right protective plates 14. The air filters 15 capture dust contained in the outside air at a work site such as a mine and supply clean air (intake air) to the engine.

[0035] Next, refer to Figure 3 and Figure 4 The vehicle body frame 16 of the present invention is described. The vehicle body frame 16 is configured as a universal component that can be commonly used not only in the standard specification dump truck 1 illustrated in this embodiment, but also in the special specification dump truck 41 illustrated in the second embodiment described later and the wireline specification dump truck 51 illustrated in the third embodiment.

[0036] The vehicle body frame 16 serves as the base of the vehicle body 2 and constitutes a strong supporting structure. In the present embodiment, the vehicle body frame 16 is configured to include a main frame 17 extending in the front-rear direction and a front bumper 28 integrally fixed to the front side of the main frame 17. The main frame 17, which is a main structure of the vehicle body frame 16, is composed of a left frame 18, a right frame 19, a front frame 20, a rear frame 21, an upper plate 22, a lower plate 23, a left support 24, a right support 25, and the like.

[0037] The left frame 18 is arranged on the left side of the vehicle body frame 16 and extends in the front-rear direction. The left frame 18 is configured to include left and right side panels 18A facing each other in the left-right direction, an upper panel 22 closing the upper ends of the left and right side panels 18A, and a lower panel 23 connecting the lower ends of the left and right side panels 18A. The right frame 19 is arranged on the right side of the vehicle body frame 16 and extends in the front-rear direction. The right frame 19 is configured to include left and right side panels 19A facing each other in the left-right direction, an upper panel 22 closing the upper ends of the left and right side panels 19A, and a lower panel 23 connecting the lower ends of the left and right side panels 19A.

[0038] The front frame 20 connects the front end of the left frame 18 and the front end of the right frame 19. The front frame 20 is configured to include: a front plate 20A and a rear plate (not shown) facing each other in the front-rear direction; an upper plate 22 that closes the upper ends of the front plate 20A and the rear plate; and a lower plate 23 that closes the lower ends of the front plate 20A and the rear plate. The left end of the front frame 20 is joined to the front end of the left frame 18 by welding, and the right end of the front frame 20 is joined to the front end of the right frame 19 by welding.

[0039] The rear frame 21 connects the rear end of the left frame 18 and the rear end of the right frame 19. The rear frame 21 is configured to include: a front plate 21A and a rear plate (not shown) facing each other in the front-rear direction; an upper plate 22 that closes the upper ends of the front plate 21A and the rear plate; and a lower plate 23 that closes the lower ends of the front plate 21A and the rear plate. The left end of the rear frame 21 is joined to the rear end of the left frame 18 by welding, and the right end of the rear frame 21 is joined to the rear end of the right frame 19 by welding.

[0040] The upper plate 22 closes the upper ends of the left frame 18, the right frame 19, the front frame 20, and the rear frame 21, and connects the left frame 18 and the right frame 19. The rear side of the upper plate 22 becomes a rear connecting portion 22A that connects the left frame 18 and the right frame 19. The front side of the rear connecting portion 22A becomes a two-forked branch portion 22B that closes the upper ends of the left frame 18 and the right frame 19. The front end of the branch portion 22B is connected by a front connecting portion 22C, and the front connecting portion 22C closes the upper end of the front frame 20.

[0041] The lower plate 23 closes the lower ends of the left frame 18, the right frame 19, the front frame 20, and the rear frame 21 in a state of being opposed to the upper plate 22 in the vertical direction, and connects the left frame 18 and the right frame 19. The lower plate 23 is configured similarly to the upper plate 22 to include a rear connecting portion 23A, a two-fork-shaped branch portion 23B, and a front connecting portion (not shown). The rear connecting portion 23A connects the left frame 18 and the right frame 19. The branch portion 23B closes the lower ends of the left frame 18 and the right frame 19. The front connecting portion closes the lower end of the front frame 20.

[0042] The left support 24 and the right support 25 are provided at the front side from the center of the vehicle body frame 16 in the front-rear direction, and face each other in the left-right direction. These left support 24 and the right support 25 are formed of a hollow can structure in a mountain shape. The left support 24 is provided to protrude upward from the upper plate 22 constituting the left frame 18, and the right support 25 is provided to protrude upward from the upper plate 22 constituting the right frame 19. A square tube-shaped upper cross beam (not shown) extending in the left-right direction is mounted on the upper ends of the left support 24 and the right support 25, and the bottom plate 8 is mounted on the upper side of the upper cross beam.

[0043] The rear end of the main frame 17 is provided with left and right rear end brackets 26. The rear end brackets 26 protrude rearward from the rear ends of the upper plates 22 constituting the left frame 18 and the right frame 19, respectively, and face each other in the left-right direction. The left and right rear end brackets 26 support the bottom surface of the loading platform 5 via the connecting pins 5B so as to be rotatable.

[0044] Left and right cylinder brackets 27 (only the left side is shown) are provided at the lower side of the middle part in the front-rear direction of the main frame 17. These left and right cylinder brackets 27 protrude downward from the lower plate 23 constituting the left frame 18 and the right frame 19, and face each other in the left-right direction. A cylinder support shaft 27A extending in the left-right direction is fixed to the protruding end side of the cylinder bracket 27, and the lower end side of the lift cylinder 6 is rotatably mounted on the cylinder support shaft 27A.

[0045] In the present embodiment, the front bumper 28 is integrally fixed to the front side of the front frame 20 constituting the main frame 17. The front bumper 28 has a U-shaped cross-sectional shape by the front frame portion 28A, the left frame portion 28B and the right frame portion 28C, and is formed as a frame body bent into a U-shape as a whole. The front frame portion 28A is opposite to the front frame 20 in the front-to-back direction and extends in the left-to-right direction. The left frame portion 28B connects the left end of the front frame portion 28A to the left end of the front frame 20. The right frame portion 28C connects the right end of the front frame portion 28A to the right end of the front frame 20. In the present embodiment, the front bumper 28 is firmly joined to the front frame 20 by welding means and is integrated with the main frame 17. The left frame portion 28B of the front bumper 28 is continuous with the left frame 18 of the main frame 17 in the front-to-back direction via the front frame 20. The right frame portion 28C of the front bumper 28 is continuous with the right frame 19 of the main frame 17 in the front-rear direction via the front frame 20. Thus, the load acting on the front bumper 28 is smoothly transmitted to the left frame 18 and the right frame 19 of the main frame 17. As a result, the load generated by the weight of the radiator 11 can be suppressed from being concentrated on the front bumper 28, and the load can be appropriately distributed to the front bumper 28 and the main frame 17.

[0046] A pair of hooks 28D for lifting are fixed to the outer side of the front frame portion 28A of the front bumper 28 in a manner separated in the left-right direction. A wire rope for lifting is hooked and fixed to the hook 28D. In addition to the hook 28D, the body frame 16 is also provided with a hook (not shown). The dump truck 1 is lifted by a crane or the like in a state where the wire rope is hooked and fixed to a plurality of hooks including the hook 28D. Here, when the dump truck 1 is lifted, a large load acts on the joint between the front bumper 28 provided with the hook 28D and the main frame 17. In contrast, in the present embodiment, the body frame 16 fixes (joins) the front frame 20 constituting the main frame 17 and the front bumper 28 as a whole by welding means. As a result, when the dump truck 1 is lifted, sufficient strength is ensured at the joint between the front bumper 28 and the main frame 17 (front frame 20).

[0047] The pedestal fixing portion 29 is respectively provided on the outer side surface of the left frame portion 28B and the outer side surface of the right frame portion 28C constituting the front bumper 28 (only the left frame portion 28B side is shown in the figure). Figure 4 As shown, the pedestal fixing portion 29 is composed of three plate-shaped threaded seats 29A, 29B, and 29C arranged adjacent to each other in the front-rear direction. A plurality of (e.g., four) bolt holes (internal threaded holes) 29D are formed in each of the three threaded seats 29A, 29B, and 29C. A device mounting pedestal 30 of the standard specification heat sink 11 suitable for this embodiment is mounted on the threaded seats 29A and 29B constituting the pedestal fixing portion 29.

[0048] Here, the base fixing portion 29 can selectively fix not only the equipment mounting base 30 for installing the standard specification radiator 11 of the present embodiment, but also a plurality of equipment mounting bases including an equipment mounting base 44 for installing the special specification radiator 42 of the second embodiment described later and an equipment mounting base 56 for installing the pantograph bracket 55 of the overhead wiring specification of the third embodiment.

[0049] In order to mount the standard radiator 11 on the front bumper 28, the left and right device mounting pedestals 30 are respectively mounted on the pedestal fixing portions 29 provided on the left frame portion 28B and the right frame portion 28C of the front bumper 28. The device mounting pedestal 30 includes a square cylindrical mounting base 31 extending in the front-rear direction and a support frame 32 provided on the upper surface of the mounting base 31.

[0050] The mounting base 31 is detachably mounted on the left frame portion 28B and the right frame portion 28C of the front bumper 28. The mounting base 31 is formed with a plurality of (for example, six) bolt insertion holes 31A (only two are shown) that penetrate in the left-right direction. Bolts 33 are inserted through each of these bolt insertion holes 31A. The plurality of bolt insertion holes 31A correspond to four bolt holes 29D of the threaded seat 29A of the base fixing portion 29 constituting the front bumper 28, and two bolt holes 29D of the threaded seat 29B. The bolts 33 inserted through the bolt insertion holes 31A of the mounting base 31 are screwed into the bolt holes 29D of the threaded seats 29A and 29B of the base fixing portion 29. Thus, the device mounting base 30 dedicated to the radiator 11 is fixed to the left frame portion 28B and the right frame portion 28C of the front bumper 28, respectively.

[0051] The support frame 32 is formed of a U-shaped frame body, and is fixed to the upper surface of the middle part of the mounting base 31 in the front-rear direction (length direction) by welding or other means. A plurality of (for example, two) assembly mounting holes 32A penetrating in the up-down direction are formed on the upper surface of the support frame 32. The assembly mounting holes 32A correspond to the two assembly members 13 provided on the mounting leg portion 12A of the radiator frame 12 constituting the radiator 11. Therefore, the assembly members 13 of the radiator frame 12 can be mounted to the assembly mounting holes 32A of the support frame 32 in a state where the device mounting pedestal 30 is respectively fixed to the left frame portion 28B and the right frame portion 28C of the front bumper 28. Thus, the radiator 11 of standard specifications can be mounted to the front bumper 28 of the vehicle body frame 16 via the device mounting pedestal 30. In this case, the radiator 11 is mounted to the front bumper 28 via the device mounting pedestal 30 in a state of straddling the front bumper 28 in the left-right direction, and is mounted on the front bumper 28 in a stable state.

[0052] The dump truck 1 of the first embodiment has the structure as described above. When the dump truck 1 is used to transport crushed stones from a mine or the like, an operator riding in the cab 9 starts the engine, and the engine drives a hydraulic pump, a generator, etc. (none of which is shown in the figure). The electric motor of the travel device is supplied with power from the generator, and the rear wheel 4 is driven to rotate, whereby the dump truck 1 travels to the gravel field. In addition, the crushed stones excavated by a large hydraulic excavator or the like (not shown in the figure) are loaded on the loading platform 5 of the dump truck 1 stopped at the gravel field. After the dump truck 1 loaded with the crushed stones travels to the collection yard, the loading platform 5 is tilted and moved by the lifting cylinder 6, and the crushed stones are discharged to the collection yard. When the dump truck 1 is in operation, the engine, etc. can be cooled by the radiator 11.

[0053] In this way, the dump truck 1 of the first embodiment can fix the equipment mounting base 30 to the base fixing portion 29 (threaded bases 29A, 29B) provided on the front bumper 28 using a plurality of bolts 33. Thus, the standard radiator 11 can be mounted to the front bumper 28 of the vehicle body frame 16 via the dedicated equipment mounting base 30.

[0054] then, Figures 5 to 7 A dump truck 41 of a special specification according to a second embodiment of the present invention is shown. The dump truck 41 has a radiator 42 of a special specification mounted on the front bumper 28 of the vehicle body frame 16 via an equipment mounting pedestal 44 described later. In the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and their descriptions are omitted.

[0055] The special specification radiator 42 is another example of the equipment mounted on the front bumper 28. The dump truck 41 is configured similarly to the standard specification dump truck 1, including: a self-propelled vehicle body 2 having left and right front wheels 3 and left and right rear wheels 4; and a loading platform 5 to be described later mounted on the vehicle body 2 in a manner that allows tilting (up and down). The vehicle body 2 of the dump truck 41 is configured to include: a vehicle body frame 16 that is a common component with the standard specification dump truck 1, a cabin 7 mounted on the vehicle body frame 16, a floor 8, a cab 9, etc. However, the dump truck 41 is different from the dump truck 1 of the first embodiment in that a special specification radiator 42 is provided on the front bumper 28 constituting the vehicle body frame 16.

[0056] A radiator 42 of special specifications is mounted on the front bumper 28 of the vehicle body frame 16. Figure 7 As shown, the radiator 42 has a rectangular frame-shaped radiator frame 43 and a heat exchanger body (not shown) arranged inside the radiator frame 43. The radiator 42 is larger in size than the standard radiator 11 in the left-right direction (width dimension) A, thereby improving the cooling performance for the engine and the like. Mounting legs 43A are provided at the lower ends of the left and right sides of the radiator frame 43, respectively. A plurality of (for example, two) assembly members 43B are provided adjacent to each other in the front-rear direction on the left and right mounting legs 43A, respectively, and these assembly members 43B are mounted on the equipment mounting base 44.

[0057] In order to mount the radiator 42 of special specifications on the front bumper 28, the left and right equipment mounting pedestals 44 are respectively mounted on the pedestal fixing portions 29 provided on the left frame portion 28B and the right frame portion 28C of the front bumper 28. The equipment mounting pedestal 44 has a square cylindrical mounting base 45 extending in the front-rear direction and a support frame 46 provided on the upper surface of the mounting base 45.

[0058] The mounting base 45 is detachably mounted to the left frame portion 28B and the right frame portion 28C of the front bumper 28. A flat flange plate 45A is provided in the middle portion of the mounting base 45 in the front-rear direction (length direction) so as to protrude toward the left frame portion 28B and the right frame portion 28C of the front bumper 28. A plurality of (e.g., eight) bolt insertion holes 45B are formed in the flange plate 45A and penetrate in the left-right direction. These bolt insertion holes 45B correspond to the four bolt holes 29D of the threaded seat 29A and the four bolt holes 29D of the threaded seat 29B constituting the pedestal fixing portion 29 of the front bumper 28. The bolts 47 inserted into the bolt insertion holes 45B of the mounting base 45 (flange plate 45A) are screwed into the bolt holes 29D of the threaded seats 29A and 29B of the pedestal fixing portion 29. Thus, the device mounting base 44 dedicated to the radiator 42 is fixed to the left frame portion 28B and the right frame portion 28C of the front bumper 28, respectively.

[0059] The support frame 46 is composed of a U-shaped frame body, and is fixed to the upper surface of the middle part of the front-to-back direction (length direction) of the mounting base 45 by welding or other means. A plurality of (for example, two) assembly mounting holes 46A are formed on the upper surface of the support frame 46, which penetrate in the up-down direction. The assembly mounting holes 46A correspond to two assembly components 43B provided on the mounting leg 43A of the radiator frame 43 constituting the radiator 42. Therefore, the assembly components 43B of the radiator frame 43 can be installed in the assembly mounting holes 46A of the support frame 46 in a state where the equipment mounting base 44 is respectively fixed to the left frame portion 28B and the right frame portion 28C of the front bumper 28. As a result, the radiator 42 of special specifications is installed on the front bumper 28 via the equipment mounting base 44 in a state of straddling the front bumper 28 in the left-right direction, and is mounted on the front bumper 28 in a stable state.

[0060] The dump truck 41 of the second embodiment is equipped with the radiator 42 of the special specification as described above. When the dump truck 41 is in operation, the engine and the like can be efficiently cooled by the radiator 42 having high cooling performance. In this way, the dump truck 41 of the second embodiment can fix the equipment mounting pedestal 44 to the pedestal fixing portion 29 (threaded pedestals 29A, 29B) provided in the front bumper 28 using a plurality of bolts 47. Thus, the radiator 42 of the special specification can be mounted on the front bumper 28 of the vehicle body frame 16 as a common component via the dedicated equipment mounting pedestal 44.

[0061] then, Figures 8 to 10 A dump truck 51 of overhead wire specifications according to a third embodiment of the present invention is shown. The dump truck 51 travels by supplying power from overhead wires (overhead wires) installed in mines and the like to an electric motor of a travel device via a power collector (overhead wire) 52. Therefore, the dump truck 51 is equipped with a pantograph bracket 55 on the front bumper 28 of the vehicle body frame 16 via an equipment mounting pedestal 56 described later. In the third embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and their descriptions are omitted.

[0062] The dump truck 51 of overhead wire specification is configured similarly to the dump truck 1 of standard specification, and includes: a self-propelled vehicle body 2 having left and right front wheels 3 and left and right rear wheels 4; and a loading platform 5 described later mounted on the vehicle body 2 in a manner that allows tilting (heaving) movement. The vehicle body 2 of the dump truck 51 is configured to include: a vehicle body frame 16 that is a common component with the dump truck 1 of standard specification, a cabin 7 mounted on the vehicle body frame 16, a floor 8, a cab 9, and the like. However, the dump truck 51 is different from the dump truck 1 of the first embodiment in that a pantograph bracket 55 that supports a pantograph 53 of a power collector 52 is mounted on the front bumper 28 constituting the vehicle body frame 16.

[0063] The left and right current collectors 52 are located in front of the radiator 11 and are provided at the front end of the dump truck 51. Fig. 9 As shown, the power collecting device 52 is mounted on the left and right sides of the pantograph bracket 55 mounted on the front bumper 28 of the vehicle body frame 16. The power collecting device 52 collects power from the overhead wire (not shown) installed on the route (travel line) of the dump truck 51 in a mine or the like, and supplies it to the electric motor of the travel device. The power collecting device 52 includes: a pantograph 53 which is provided between the pantograph bracket 55 and the overhead wire in a retractable manner; and a power collecting shoe 54 which is provided on the upper end side of the pantograph 53 and collects power by sliding contact with the overhead wire when the pantograph 53 is extended.

[0064] The pantograph bracket 55 is another example of a device mounted on the front bumper 28. The pantograph bracket 55 is constructed to include four pillars 55A, a rectangular mounting frame 55B, and a plurality of reinforcing beams 55C. The four pillars 55A are arranged in a manner with intervals in the front, back, left, and right directions, and extend in the up and down directions. The rectangular mounting frame 55B is arranged at the upper end of the pillar 55A and extends from the pillar 55A to the left and right sides. A plurality of reinforcing beams 55C connect the four pillars 55A. Mounting flanges 55D are provided at the lower ends of the four pillars 55A, and these mounting flanges 55D are mounted on the pillar support seats 59 of the equipment mounting base 56. In addition, the lower end side of the pantograph 53 is mounted on the left and right sides of the mounting frame 55B, respectively.

[0065] In order to mount the pantograph bracket 55 on the front bumper 28, the left and right equipment mounting pedestals 56 are respectively mounted on the pedestal fixing portions 29 provided on the left frame portion 28B and the right frame portion 28C of the front bumper 28. The equipment mounting pedestal 56 includes a square cylindrical mounting base 57 extending in the front-rear direction, a support frame 58 provided on the upper surface of the mounting base 57, and two support support seats 59 located on the front side of the support frame 58 and provided on the upper surface of the mounting base 57.

[0066] The mounting base 57 is detachably mounted on the left frame 28B and the right frame 28C of the front bumper 28. The mounting base 57 is formed with a plurality of (e.g., twelve) bolt insertion holes 57A (only two are shown) that penetrate in the left-right direction, and bolts 60 are inserted through each of these bolt insertion holes 57A. The plurality of bolt insertion holes 57A correspond to four bolt holes 29D of the threaded seat 29A, four bolt holes 29D of the threaded seat 29B, and four bolt holes 29D of the threaded seat 29C that constitute the pedestal fixing portion 29 of the front bumper 28. The bolts 60 inserted through the bolt insertion holes 57A of the mounting base 57 are screwed into the bolt holes 29D of the threaded seats 29A, 29B, and 29C of the pedestal fixing portion 29. Thus, the device mounting base 56 dedicated to the pantograph bracket 55 is fixed to the left frame 28B and the right frame 28C of the front bumper 28, respectively.

[0067] The support frame 58 is formed of a U-shaped frame body and is fixed to the upper surface of the rear side of the mounting base 57 by welding or other means. A plurality of assembly mounting holes 58A penetrating in the up-down direction are formed on the upper surface of the support frame 58. These assembly mounting holes 58A correspond to two assembly members 13 provided on the radiator frame 12 (mounting leg 12A) constituting the radiator 11. Therefore, the assembly members 13 of the radiator frame 12 can be mounted to the assembly mounting holes 58A of the support frame 58 in a state where the equipment mounting base 56 is respectively fixed to the left frame portion 28B and the right frame portion 28C of the front bumper 28.

[0068] The support seat 59 is located on the front side of the support frame 58 and is provided on the upper surface of the mounting base 57. Two support seats 59 are provided in a front-rear separation, corresponding to the mounting flanges 55D at the lower ends of the front and rear support seats 55A of the four support seats 55A provided in the pantograph bracket 55. A plurality of bolt holes (internal thread holes) 59A penetrating in the up-down direction are formed in the support seat 59. The bolts 61 inserted into the bolt insertion holes formed in the mounting flanges 55D of the support seats 55A are screwed into the bolt holes 59A of the support seat 59. Thus, the pantograph bracket 55 can be mounted on the front bumper 28 of the vehicle body frame 16 via the device mounting seat 56. Thus, the pantograph bracket 55 is mounted on the front bumper 28 via the device mounting seat 56 in a state of straddling the front bumper 28 in the left-right direction, and is mounted on the front bumper 28 in a stable state. Furthermore, by mounting the pantograph 53 on both left and right sides of the mounting frame 55B of the pantograph bracket 55 , the dump truck 51 of overhead wire specifications can be assembled.

[0069] The dump truck 51 of the third embodiment has the above-described structure. When the dump truck 1 is used to transport crushed stones in a mine or the like, the pantograph 53 mounted on the pantograph bracket 55 is extended, and the collector shoe 54 is brought into contact with an overhead wire (not shown) installed in the mine or the like. Thus, the power from the overhead wire is supplied to the electric motor of the travel device via the collector device 52. The dump truck 51 travels along the overhead wire between the crushing site and the collection site, loads the crushed stones on the loading platform 5 in the crushing site, and discharges the loaded crushed stones in the collection site.

[0070] In this way, the dump truck 51 of the third embodiment can fix the equipment mounting base 56 to the base fixing portion 29 (threaded bases 29A, 29B, 29C) provided on the front bumper 28 using a plurality of bolts 60. Thus, the pantograph bracket 55 and the radiator 11 of standard specifications can be mounted to the front bumper 28 of the vehicle body frame 16 via the dedicated equipment mounting base 56.

[0071] Thus, in the embodiment, the dump truck (1, 41, 51) comprises: a body frame 16, on which the front wheels 3 and the rear wheels 4 are mounted; and a loading platform 5, which is arranged in a manner that can be tilted and moved relative to the body frame 16 and loads the transported object, and the body frame 16 is configured to include: a left frame 18, which is arranged on the left side in the left-right direction and extends in the front-back direction; a right frame 19, which is arranged on the right side in the left-right direction and extends in the front-back direction; a front frame 20, which connects the front end of the left frame 18 with the front end of the right frame 19 The front bumper 28 is connected to the front end and extends in the left-right direction; and the front bumper 28 is fixed to the front side of the front frame 20, is provided with a hook 28D for lifting, and is equipped with equipment (radiator 11, radiator 42, pantograph bracket 55). In the dump truck (1, 41, 51), the front bumper 28 has a pedestal fixing portion 29, and the pedestal fixing portion 29 selectively fixes a plurality of equipment mounting pedestals (30, 44, 56) corresponding to the types of equipment (radiator 11, radiator 42, pantograph bracket 55).

[0072] According to this structure, a plurality of equipment mounting pedestals (30, 44, 56) corresponding to the equipment mounted on the front bumper 28 (radiator 11, radiator 42, pantograph bracket 55) can be selectively fixed to the pedestal fixing portion 29 of the front bumper 28. In this case, the front bumper 28 has a single shape regardless of the type of equipment mounted, and is fixed to the front side of the front frame 20 of the main frame 17. As a result, the vehicle body frame 16 can be made common regardless of the type of equipment mounted. As a result, the cost of manufacturing the dump trucks 1, 41, 51 of different specifications can be reduced, and the dump truck can be easily changed to a new specification.

[0073] Furthermore, a hook 28D for lifting is fixed to the front bumper 28, and the front bumper 28 is integrally fixed to the front frame 20 constituting the main frame 17 using a welding mechanism. Thus, when the dump truck 1 (41, 51) is lifted using a rope hooked and fixed to the hook 28D, sufficient strength can be ensured at the joint between the front bumper 28 and the main frame 17 (front frame 20). As a result, for example, the strength of the vehicle body frame 16 during the lifting operation can be improved compared to a case where the front bumper is formed independently of the main frame and is attached to the main frame using a fastener.

[0074] In the embodiment, the front bumper 28 is configured to include: a front frame portion 28A, which is opposed to the front frame 20 in the front-rear direction and extends in the left-right direction, and is provided with a hook 28D; a left frame portion 28B, which connects the left end of the front frame portion 28A to the front frame 20; and a right frame portion 28C, which connects the right end of the front frame portion 28A to the front frame 20, and a pedestal fixing portion 29 is provided on the left frame portion 28B and the right frame portion 28C. According to this structure, the equipment (radiator 11, radiator 42, pantograph bracket 55) is mounted on the front bumper 28 via the equipment mounting pedestal (30, 44, 56) in a state of straddling the front bumper 28 in the left-right direction. As a result, the equipment (radiator 11, radiator 42, pantograph bracket 55) can be mounted on the front bumper 28 in a stable state.

[0075] In the embodiment, the left frame portion 28B of the front bumper 28 and the left frame 18 are continuous in the front-rear direction via the front frame 20, and the right frame portion 28C of the front bumper 28 and the right frame 19 are continuous in the front-rear direction via the front frame 20. According to this structure, the load acting on the front bumper 28 can be smoothly transmitted to the left frame 18 and the right frame 19 of the main frame 17. As a result, it is possible to suppress the load generated by the weight of the equipment (radiator 11, radiator 42, pantograph bracket 55) from being concentrated on the front bumper 28, and the load can be appropriately distributed to the front bumper 28 and the main frame 17.

[0076] In the embodiment, the pedestal fixing portion 29 provided on the front bumper 28 is constituted by three screw seats 29A, 29B, and 29C. However, the present invention is not limited thereto, and the pedestal fixing portion 29 may be constituted by one, two, or four or more screw seats.

[0077] Explanation of symbols

[0078] 1, 41, 51—dump truck; 2—body; 3—front wheel; 4—rear wheel; 5—loading platform; 11, 42—radiator (equipment category); 16—body frame; 18—left frame; 19—right frame; 20—front frame; 28—front bumper; 28A—front frame; 28B—left frame; 28C—right frame; 28D—hook; 29—pedestal fixing part; 30, 44, 56—equipment mounting pedestal; 55—pantograph bracket (equipment category).

Claims

1. A dump truck comprising: a body frame on which wheels are mounted; and a loading platform which is arranged to be tiltably movable relative to the vehicle body frame and on which the transported object is loaded, The vehicle body frame is constructed to include: A left frame, which is arranged on the left side in the left-right direction and extends in the front-back direction; A right frame, which is arranged on the right side in the left-right direction and extends in the front-back direction; a front frame connecting the front end of the left frame and the front end of the right frame and extending in the left-right direction; and The front bumper is fixed to the front side of the front frame, is provided with a hook for lifting, and is equipped with equipment. The dump truck is characterized in that The front bumper includes a pedestal fixing portion that selectively fixes a plurality of types of equipment mounting pedestals corresponding to types of equipment.

2. The dump truck according to claim 1, characterized in that: The front bumper is composed of: a front frame portion, which is opposite to the front frame in the front-rear direction and extends in the left-right direction, and is provided with the hook; a left frame portion connecting a left end of the front frame portion to the front frame; and a right frame portion, which connects the right end of the front frame portion to the front frame, The pedestal fixing portion is respectively arranged on the left frame portion and the right frame portion.

3. The dump truck according to claim 2, characterized in that: The left frame portion of the front bumper and the left frame are continuous in the front-rear direction via the front frame. The right frame portion and the right frame of the front bumper are continuous in the front-rear direction via the front frame.

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