Dump truck

Abstract

To provide a dump truck, which is configured so that a capacity of a fuel tank can be satisfactorily secured, without increasing weight of a vehicle body.SOLUTION: A vehicle body frame 13 of a dump truck 1 comprises: a left outer side plate 14A; a right outer side plate 15A; an upper plate 18 connecting an upper end of the left outer side plate 14A to an upper end of the right outer side plate 15A; a lower plate 19 connecting a lower end of the left outer side plate 14A to a lower end of the right outer side plate 15A; a left inner side plate 14B arranged between the upper plate 18 and the lower plate 19 to oppose to the left outer side plate 14A in a lateral direction; and a right inner side plate 15B arranged between the upper plate 18 and the lower plate 19 to oppose to the right outer side plate 15A in the lateral direction. A left oil storage tank 36 is configured to be surrounded by the left outer side plate 14A, the left inner side plate 14B, the upper plate 18 and the lower plate 19, and is provided with a hydraulic oil filler port 40 and a hydraulic oil discharge port 41. A right oil storage tank 37 is configured to be surrounded by the right outer side plate 15A, the right inner side plate 15B, the upper plate 18 and the lower plate 19 and is provided with a pressure-type fuel filler port 46 and a fuel discharge port 48.SELECTED DRAWING: Figure 3

Description

[Technical field]

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

[0002] Generally, in open-cut mining sites and mines, crushed material such as minerals is excavated using a hydraulic excavator, and the excavated crushed material is loaded onto a dump truck and transported to an unloading site. A dump truck includes a body frame to which front and rear wheels are attached, and a loading platform (vessel) attached so as to be rotatable up and down with the rear side of the body frame as a fulcrum.

[0003] There is a demand for increasing the capacity of the fuel tank for dump trucks to increase the travel distance. On the other hand, there is a demand for reducing the weight of the vehicle body as much as possible in order to increase the load capacity on the bed. Increasing the capacity of the fuel tank directly leads to an increase in the vehicle body weight, which is contradictory to the demand for reducing the vehicle body weight to increase the load capacity on the bed. In general, a dump truck has a hydraulic oil tank attached to one of the left and right sides of the vehicle body frame, and a fuel tank attached to the other left and right side. Patent Document 1 also proposes a dump truck in which an auxiliary fuel tank is arranged on the hydraulic oil tank, and the fuel tank (main fuel tank) and the auxiliary fuel tank are connected via a communication pipe.

[0004] The dump truck in Patent Document 1 reduces the fuel in the fuel tank and the fuel in the auxiliary tank by the same amount by arranging the upper surface of the fuel tank (main fuel tank) and the upper surface of the auxiliary fuel tank, which are connected via a communicating pipe, at the same height. In this way, by reducing the weight of the left and right sides of the vehicle body equally, the left and right weight balance of the vehicle body can be maintained well regardless of the change in the vehicle body weight due to fuel consumption. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] WO2014 / 080714 Summary of the Invention [Problem to be solved by the invention]

[0006] The dump truck of Patent Document 1 can increase the travel distance by increasing the capacity of the fuel tank while maintaining the left-right weight balance of the vehicle body. However, the vehicle body weight increases as the capacity of the fuel tank increases, and the loading capacity of the loading platform decreases accordingly.

[0007] Furthermore, the hydraulic oil tank and the fuel tank are located between the front and rear wheels and attached to the left and right sides of the body frame, respectively, which poses a problem that when performing maintenance on the hydraulic pump that supplies pressure oil to the hydraulic actuator mounted on the body, the hoist cylinder that rotates the loading platform relative to the body frame, etc., the hydraulic oil tank and the fuel tank limit the work space, reducing the efficiency of the maintenance work.

[0008] The present invention has been made in consideration of the problems with the conventional technology described above, and an object of the present invention is to provide a dump truck that is capable of ensuring sufficient fuel tank capacity without increasing the vehicle body weight. [Means for solving the problem]

[0009] The present invention provides a vehicle having a body frame to which wheels are attached, and a loading platform attached to the body frame in a manner that allows it to be raised and lowered, the body frame including a left outer plate disposed on the left side in the left-right direction and extending in the front-rear direction, a right outer plate disposed on the right side in the left-right direction and extending in the front-rear direction, an upper plate connecting upper ends of the left outer plate and the right outer plate, a lower plate connecting lower ends of the left outer plate and the right outer plate and facing the upper plate in the up-down direction, a left inner plate disposed between the upper plate and the lower plate and facing the left outer plate in the left-right direction while extending in the front-rear direction, and a lower plate between the upper plate and the lower plate. and a right inner plate arranged on the left outer plate and facing the right outer plate in the left-right direction and extending in the front-rear direction, the dump truck is characterized in that a left oil storage tank is surrounded by the left outer plate, the left inner plate, the upper plate, and the lower plate, has an sealed structure for storing oil therein, and is provided with an oil inlet and an oil discharge port, and a right oil storage tank is surrounded by the right outer plate, the right inner plate, the upper plate, and the lower plate, has an sealed structure for storing oil therein, and is provided with an oil inlet and an oil discharge port. Effect of the Invention

[0010] According to the present invention, the left oil storage tank is formed using the left outer plate, left inner plate, upper plate, and lower plate that constitute the body frame, and the right oil storage tank is formed using the right outer plate, right inner plate, upper plate, and lower plate. This makes it unnecessary to attach the oil storage tank to the body frame, and ensures a sufficient capacity of the fuel tank without increasing the weight of the vehicle body. [Brief description of the drawings]

[0011] [Figure 1] 1 is a left side view showing a dump truck to which an embodiment of the present invention is applied. [Diagram 2] FIG. 2 is a perspective view showing a vehicle body frame. [Diagram 3] FIG. [Figure 4] 4 is a left side view of the body frame as viewed from the direction of arrows IV-IV in FIG. 3. [Diagram 5]4 is a right side view of the body frame as viewed in the direction of arrow VV in FIG. 3. [Figure 6] 6 is a rear view of the body frame from the direction of arrows VI-VI in FIG. 3 with brackets removed. [Figure 7] 7 is a cross-sectional view of the body frame as viewed from the direction of arrows VII-VII in FIG. 4. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Hereinafter, a dump truck according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. In the embodiment, the dump truck will be described assuming that the traveling direction is the front-rear direction and the direction perpendicular to the traveling direction is the left-right direction.

[0013] In Fig. 1, the dump truck 1 includes a vehicle body frame 13 (to be described later) on which left and right front wheels 2 and left and right rear wheels 3 are attached, and a loading platform 7 (to be described later) mounted on the vehicle body frame 13 so as to be tiltable (raised and lowered). The dump truck 1 loads crushed material such as minerals excavated in a mine onto the loading platform 7 and transports it. The body of the dump truck 1 includes the vehicle body frame 13, a deck 12, a cab 12A, etc. (to be described later).

[0014] The left and right front wheels (only the left one is shown) 2 are rotatably mounted on the front side of the body frame 13 and constitute steered wheels. The left and right front wheels 2 are each supported by a trailing arm (not shown), and these left and right trailing arms are elastically supported by the front-wheel side suspensions 4. As a result, the left and right front wheels 2 are elastically supported by the body frame 13 via the front-wheel side suspensions 4, and vibrations transmitted from the front wheels 2 to the body frame 13 are damped.

[0015] The left and right rear wheels (only the left one is shown) 3 are rotatably mounted on the rear side of the body frame 13, and are rotationally driven by a traveling device 5 equipped with an electric motor (not shown). The traveling device 5 for the rear wheels 3 is elastically supported by the body frame 13 via a rear-wheel-side suspension 6, and vibrations transmitted from the rear wheels 3 to the body frame 13 are damped.

[0016] The loading platform 7 is mounted on the vehicle body frame 13 so as to be tiltable (able to rise and fall). The loading platform 7 is formed as a large container with a bottom in order to carry, for example, a large amount of excavated crushed stone. The rear bottom of the loading platform 7 is connected to a left rear end bracket 32 ​​and a right rear end bracket 33 (described below) provided on the vehicle body frame 13 via a connecting pin 7A so as to be tiltable. A eaves portion 7B is integrally provided on the front side of the loading platform 7, extending horizontally forward from the top, and the eaves portion 7B extends to the front side of the deck 12 while covering the cab 12A from above.

[0017] Two hoist cylinders 8 are provided between the vehicle body frame 13 and the loading platform 7 in a pair in the left-right direction (only the left side is shown). The hoist cylinders 8 are, for example, hydraulic cylinders, and one end side (lower end side) of the hoist cylinders 8 is rotatably attached to a cylinder support shaft 31 described later, and the other end side (upper end side) of the hoist cylinders 8 is rotatably attached to the bottom side of the loading platform 7. Therefore, the front side of the loading platform 7 rotates (lifts and lowers) in the vertical direction with the connecting pin 7A as a fulcrum due to the extension and contraction of the hoist cylinders 8. The crushed stone loaded on the loading platform 7 is discharged to the outside from the rear side of the loading platform 7 by lifting the front side of the loading platform 7 upward.

[0018] The building 9 is provided on the front end side of the body frame 13. The building 9 is formed in a frame shape surrounded by left and right side panels and a front panel, and the engine 10 and the like are housed inside the building 9. The building 9, together with a left support column 27 and a right support column 28 of the body frame 13 described below, also plays a role in supporting the deck 12, the cab 12A, and the like from below. The engine 10 drives a generator (not shown) that generates electricity to be supplied to the electric motor of the traveling device 5, and a hydraulic pump 11 that supplies hydraulic oil to hydraulic actuators such as the hoist cylinder 8. The hydraulic pump 11 is disposed in the middle of the body frame 13 in the fore-aft direction.

[0019] The deck 12 is located forward of the loading platform 7 and is provided above the building 9. The deck 12 is formed in the shape of a rectangular flat plate that is long in the left-right direction and extends horizontally while being supported from below by a left support column 27 and a right support column 28 of the vehicle body frame 13 and the building 9. A cab 12A and the like are mounted on the deck 12, and the upper surface of the deck 12 forms a flat passageway surface through which the operator and the like pass. The cab 12A is provided on the upper left side of the deck 12 and defines a cab for the operator to get in. A driver's seat, a steering wheel, an accelerator pedal, a brake pedal, and various operating lever devices (none of which are shown) are provided inside the cab 12A.

[0020] Next, the vehicle body frame 13 of the dump truck 1 according to this embodiment will be described with reference to FIGS.

[0021] The vehicle body frame 13 is the base of the dump truck 1, and is formed as a strong support structure extending in the front-rear direction. The vehicle body frame 13 is composed of a left frame 14, a right frame 15, a front frame 16, a rear end plate 17, an upper plate 18, a lower plate 19, etc., which will be described later. With the front wheels 2 and rear wheels 3 attached, the vehicle body frame 13 inclines obliquely downward from the rear side (rear end plate 17 side) to the front side (front frame 16 side). A left oil storage tank 36, a right oil storage tank 37, and an intermediate oil storage tank 38, which will be described later, are integrally formed with the vehicle body frame 13.

[0022] The left frame 14 is disposed on the left side of the body frame 13 and extends in the front-rear direction. The left frame 14 has a left outer plate 14A disposed on the outside of the body frame 13, and a left inner plate 14B disposed on the inside of the body frame 13 and facing the left outer plate 14A with a gap in the left-right direction. The upper ends of the left outer plate 14A and the left inner plate 14B are connected via an upper plate 18, and the lower ends of the left outer plate 14A and the left inner plate 14B are connected via a lower plate 19.

[0023] The right frame 15 is disposed on the right side of the body frame 13 and extends in the front-rear direction while facing the left frame 14 in the left-right direction. The right frame 15 has a right outer plate 15A disposed on the outside of the body frame 13 and a right inner plate 15B disposed on the inside of the body frame 13 and facing the right outer plate 15A with a gap in the left-right direction. The upper ends of the right outer plate 15A and the right inner plate 15B are connected via an upper plate 18, and the lower ends of the right outer plate 15A and the right inner plate 15B are connected via a lower plate 19.

[0024] The front frame 16 connects the front end of the left frame 14 and the front end of the right frame 15. The front frame 16 has a front plate 16A located at the front end of the body frame 13 and extending in the left-right direction, and a rear plate 16B facing the front plate 16A with a gap in the front-rear direction. The upper ends of the front plate 16A and the rear plate 16B are connected via an upper plate 18, and the lower ends of the front plate 16A and the rear plate 16B are connected via a lower plate 19.

[0025] Both left and right ends of the front plate 16A are joined by welding to the left outer plate 14A of the left frame 14 and the right outer plate 15A of the right frame 15. Both left and right ends of the rear plate 16B are joined by welding to the left inner plate 14B of the left frame 14 and the right inner plate 15B of the right frame 15. As a result, the front ends of the left frame 14 and the right frame 15 are integrally connected via the front frame 16.

[0026] The rear end plate 17 connects the rear end of the left frame 14 and the rear end of the right frame 15. The rear end plate 17 is formed of a plate curved in an arc shape toward the rear and extends in the left-right direction between the rear end of the left outer plate 14A and the right outer plate 15A. The left end of the rear end plate 17 is joined to the rear ends of the left outer plate 14A and the left inner plate 14B that constitute the left frame 14. The right end of the rear end plate 17 is joined to the rear ends of the right outer plate 15A and the right inner plate 15B that constitute the right frame 15. As a result, the rear ends of the left frame 14 and the right frame 15 are integrally connected via the rear end plate 17.

[0027] The upper plate 18 connects the upper ends of the left outer plate 14A of the left frame 14 and the right outer plate 15A of the right frame 15. The upper plate 18 has a connection portion 18A that connects the left frame 14 and the right frame 15, and a bifurcated left branch portion 18B and a right branch portion 18C located forward of the connection portion 18A. A front connection portion 18D that connects the left branch portion 18B and the right branch portion 18C is provided between the front end of the left branch portion 18B and the front end of the right branch portion 18C, and the front connection portion 18D connects the upper ends of the front plate 16A and the rear plate 16B that constitute the front frame 16. The upper plate 18 also has a substantially rectangular front opening 18E located between the left branch portion 18B and the right branch portion 18C, and a substantially elliptical rear opening 18F located rearward of the front opening 18E and in the center of the connection portion 18A.

[0028] The connection part 18A and the left branch part 18B of the upper plate 18 close the space between the upper ends of the left outer plate 14A and the left inner plate 14B that constitute the left frame 14. The connection part 18A and the right branch part 18C of the upper plate 18 close the space between the upper ends of the right outer plate 15A and the right inner plate 15B that constitute the right frame 15. The front connecting part 18D of the upper plate 18 closes the space between the upper ends of the front plate 16A and the rear plate 16B that constitute the front frame 16, and the connection part 18A of the upper plate 18 closes the space between the upper ends of the left inner plate 14B of the left frame 14, the right inner plate 15B of the right frame 15, and the rear end plate 17. The front opening 18E and the rear opening 18F reduce the weight of the upper plate 18 and ensure a working space during welding work.

[0029] The lower plate 19 is opposed to the upper plate 18 in the vertical direction and connects the lower ends of the left outer plate 14A of the left frame 14 and the right outer plate 15A of the right frame 15. The lower plate 19, like the upper plate 18, has a connection portion 19A that connects the left frame 14 and the right frame 15, and a bifurcated left branch portion 19B and a right branch portion 19C located forward of the connection portion 19A. A front connection portion 19D that connects the left branch portion 19B and the right branch portion 19C is provided between the front end of the left branch portion 19B and the front end of the right branch portion 19C, and the front connection portion 19D connects the lower ends of the front plate 16A and the rear plate 16B that constitute the front frame 16. The lower plate 19 is also formed with a substantially rectangular front opening 19E located between the left branch portion 19B and the right branch portion 19C, and a substantially elliptical rear opening 19F located rearward of the front opening 19E and in the center of the connection portion 19A.

[0030] The connection part 19A and the left branch part 19B of the lower plate 19 close the space between the lower ends of the left outer plate 14A and the left inner plate 14B that constitute the left frame 14. The connection part 19A and the right branch part 19C of the lower plate 19 close the space between the lower ends of the right outer plate 15A and the right inner plate 15B that constitute the right frame 15. The front connecting part 19D of the lower plate 19 closes the space between the lower ends of the front plate 16A and the rear plate 16B that constitute the front frame 16, and the connection part 19A of the lower plate 19 closes the space between the lower ends of the left inner plate 14B of the left frame 14, the right inner plate 15B of the right frame 15, and the rear end plate 17. The front opening 19E and the rear opening 19F reduce the weight of the lower plate 19 and ensure a working space during welding work.

[0031] In this way, the body frame 13 is composed of a left outer plate 14A located on the left side in the left-right direction and extending in the front-to-rear direction, a right outer plate 15A located on the right side in the left-right direction and extending in the front-to-rear direction, an upper plate 18 connecting the upper ends of the left outer plate 14A and the right outer plate 15A, a lower plate 19 connecting the lower ends of the left outer plate 14A and the right outer plate 15A and facing the upper plate 18 in the up-down direction, a left inner plate 14B located between the upper plate 18 and the lower plate 19 and extending in the front-to-rear direction while facing the left outer plate 14A in the left-to-right direction, and a right inner plate 15B located between the upper plate 18 and the lower plate 19 and extending in the front-to-rear direction while facing the right outer plate 15A in the left-to-right direction.

[0032] The left frame 14 of the body frame 13 forms a rectangular cylinder with a square cross section surrounded by a left outer plate 14A, a left inner plate 14B, an upper plate 18, and a lower plate 19, and extends in the front-to-rear direction. A left partition plate 20 is provided on the left frame 14 forward of the left support pillar 27. The left partition plate 20 is fixed to the inner surfaces of the left outer plate 14A, the left inner plate 14B, the upper plate 18, and the lower plate 19 by means of welding or the like.

[0033] The right frame 15 of the body frame 13 forms a rectangular cylinder with a square cross section surrounded by a right outer plate 15A, a right inner plate 15B, an upper plate 18, and a lower plate 19, and extends in the front-to-rear direction. A right partition plate 21 is provided at the boundary of the right frame 15 with the front frame 16. The right partition plate 21 is fixed to the inner surfaces of the right outer plate 15A, the right inner plate 15B, the upper plate 18, and the lower plate 19 by means of welding or the like.

[0034] The intermediate plate 22 is located forward of the rear end plate 17 and is provided between the left inner plate 14B and the right inner plate 15B. The intermediate plate 22 is formed of a plate body bent into a U-shape and corresponds to the curved shapes of the front opening 18E of the upper plate 18 and the rear portion of the front opening 19E of the lower plate 19. The left end 22A of the intermediate plate 22 is joined to the left inner plate 14B, and the right end 22B of the intermediate plate 22 is joined to the right inner plate 15B. The upper end of the intermediate plate 22 is joined to the connection portion 18A along the front opening 18E of the upper plate 18, and the lower end of the intermediate plate 22 is joined to the connection portion 19A along the front opening 19E of the lower plate 19.

[0035] The peripheral wall plate 23 is located between the rear end plate 17 and the intermediate plate 22 and is provided between the left inner plate 14B and the right inner plate 15B. The peripheral wall plate 23 is formed as a cylinder having a substantially elliptical shape, and corresponds to the curved shapes of the rear opening 18F of the upper plate 18 and the rear opening 19F of the lower plate 19. The upper end of the peripheral wall plate 23 is joined to the connection portion 18A along the rear opening 18F of the upper plate 18, and the lower end of the peripheral wall plate 23 is joined to the connection portion 19A along the rear opening 19F of the lower plate 19. Gaps are formed between the left inner plate 14B and the right inner plate 15B and the outer circumferential surfaces of the peripheral wall plate 23.

[0036] The reinforcing plate 24 is located between the rear end plate 17 and the peripheral wall plate 23, and is provided between the left inner plate 14B and the right inner plate 15B. The reinforcing plate 24 is formed of a rectangular flat plate and faces the rear end plate 17 in the front-rear direction. The left end of the reinforcing plate 24 is joined to the left inner plate 14B, and the right end of the reinforcing plate 24 is joined to the right inner plate 15B. The upper end of the reinforcing plate 24 is joined to the connection portion 18A of the upper plate 18, and the lower end of the reinforcing plate 24 is joined to the connection portion 19A of the lower plate 19.

[0037] As shown in Fig. 7, a communication opening 24A is formed in the center of the reinforcing plate 24. The communication opening 24A communicates between a rear space 25 surrounded by the rear end plate 17, the reinforcing plate 24, the left inner plate 14B, the right inner plate 15B, the upper plate 18, and the lower plate 19 and a front space 26 surrounded by the intermediate plate 22, the reinforcing plate 24, the left inner plate 14B, the right inner plate 15B, the upper plate 18, and the lower plate 19. In addition, a communication opening 15C that opens into the front space 26 is formed between the intermediate plate 22 and the peripheral wall plate 23 of the right inner plate 15B of the right frame 15. The communication opening 15C communicates between a right oil storage tank 37 and an intermediate oil storage tank 38, which will be described later.

[0038] The left support pillar 27 is provided on the upper surface of the left frame 14, located toward the front from the center of the left frame 14 in the front-rear direction. The left support pillar 27 is made of a hollow metal structure having a mountain shape, and is provided so as to protrude upward from the left branch portion 18B of the upper plate 18 constituting the left frame 14. The right support pillar 28 is provided on the upper surface of the right frame 15, facing the left support pillar 27 in the left-right direction. The right support pillar 28 is made of a hollow metal structure having a mountain shape similar to the left support pillar 27, and is provided so as to protrude upward from the right branch portion 18C of the upper plate 18 constituting the right frame 15. The left support pillar 27 and the right support pillar 28 support the building 9 as well as the deck 12 from below.

[0039] The left cylinder bracket 29 is provided on the underside of the left frame 14, located toward the rear from the center in the front-to-rear direction of the left frame 14. The left cylinder bracket 29 is formed of a mountain-shaped plate and protrudes downward from the left branch portion 19B of the lower plate 19 that constitutes the left frame 14. The right cylinder bracket 30 is provided on the underside of the right frame 15, facing the left cylinder bracket 29 in the left-right direction. The right cylinder bracket 30 is formed of a mountain-shaped plate similar to the left cylinder bracket 29, and protrudes downward from the right branch portion 19C of the lower plate 19 that constitutes the right frame 15.

[0040] A cylinder support shaft 31 extending in the left-right direction is inserted through the lower end sides (protruding end sides) of the left cylinder bracket 29 and the right cylinder bracket 30. The left end of the cylinder support shaft 31 protrudes leftward from the left cylinder bracket 29, and the right end of the cylinder support shaft 31 protrudes rightward from the right cylinder bracket 30. The lower ends of the hoist cylinders 8 are attached to both ends of the cylinder support shaft 31, respectively.

[0041] The left rear end bracket 32 ​​is provided at the rear end of the left frame 14. The left rear end bracket 32 ​​is formed using a steel plate or the like, and is joined to the upper plate 18 (connecting portion 18A) and the rear end plate 17, protruding rearward. The right rear end bracket 33 is provided at the rear end of the right frame 15. The right rear end bracket 33 is formed using a steel plate or the like, and is joined to the upper plate 18 (connecting portion 18A) and the rear end plate 17, protruding rearward. The left rear end bracket 32 ​​and the right rear end bracket 33 each rotatably support the bottom portion of the cargo bed 7 via a connecting pin 7A, and each support the upper end side of the rear wheel side suspension 6 via a connecting pin 6A (see FIG. 1).

[0042] The left front wheel bracket 34 is provided on the underside of the front end of the left frame 14. The right front wheel bracket 35 is provided on the underside of the front end of the right frame 15 and faces the left front wheel bracket 34 in the left-right direction. Trailing arms (not shown) that support the left and right front wheels 2 are attached to the left and right front wheel bracket 34, respectively, and these left and right trailing arms are elastically supported by the front-wheel suspension 4.

[0043] Next, the left oil storage tank 36, the right oil storage tank 37, and the intermediate oil storage tank 38 according to this embodiment will be described.

[0044] The left oil storage tank 36 is formed in the left frame 14. Specifically, the left oil storage tank 36 is surrounded by the left outer plate 14A, the left inner plate 14B, the upper plate 18, and the lower plate 19 that constitute the left frame 14, and is formed as an enclosed space with its front end closed by the left partition plate 20 and its rear end closed by the rear end plate 17. In this manner, the section of the body frame 13 that corresponds to the left frame 14 (the section hatched in FIG. 7) serves as the left oil storage tank 36, and in this embodiment, the left oil storage tank 36 constitutes a hydraulic oil tank that stores hydraulic oil to be supplied to hydraulic actuators such as the hoist cylinder 8.

[0045] The left oil storage tank 36, which constitutes the hydraulic oil tank, is inclined obliquely downward from the rear side (rear end plate 17 side) to the front side (front frame 16 side) with the front wheels 2 and rear wheels 3 attached to the body frame 13. The left oil storage tank 36 is provided with a hydraulic oil supply port 40, a hydraulic oil discharge port 41, a hydraulic oil return port 42, a hydraulic oil level gauge 43, a hydraulic oil air breather 44, and a hydraulic oil drain port 45, which will be described later.

[0046] The right oil storage tank 37 is formed in the right frame 15. Specifically, the right oil storage tank 37 is surrounded by the right outer plate 15A, the right inner plate 15B, the upper plate 18, and the lower plate 19 that constitute the right frame 15, and is formed as an enclosed space with its front end closed by the right partition plate 21 and its rear end closed by the rear end plate 17. In this embodiment, the right oil storage tank 37 stores fuel to be supplied to the engine 10. The right oil storage tank 37 is provided with a pressurized fuel filler port 46, a fuel discharge port 48, a fuel return port 49, a fuel air breather 51, a fuel drain port 52, etc., which will be described later.

[0047] The intermediate oil storage tank 38 is formed between the left inner plate 14B of the left frame 14 and the right inner plate 15B of the right frame 15, and corresponds to the rear space 25 and the front space 26. Specifically, the intermediate oil storage tank 38 is surrounded by the outer peripheral surfaces of the left inner plate 14B, the right inner plate 15B, the upper plate 18, the lower plate 19, and the peripheral wall plate 23, and is formed as an enclosed space with its front end closed by the intermediate plate 22 and its rear end closed by the rear end plate 17. A communication port 24A is formed in the reinforcing plate 24 that separates the rear space 25 and the front space 26. As a result, the intermediate oil storage tank 38 is an enclosed space in which the rear space 25 and the front space 26 are integrated and the inside of the peripheral wall plate 23 is hollow. The intermediate oil storage tank 38 is provided with a fuel filler port 47, a fuel air breather 51, a fuel level gauge 50, a fuel level sensor 53, a fuel float sensor 54, and the like, which will be described later.

[0048] Here, a communication port 15C is formed in the right inner plate 15B of the right frame 15, and the communication port 15C communicates between the right oil storage tank 37 and the intermediate oil storage tank 38. As a result, a section of the body frame 13 corresponding to the right frame 15 and the middle part in the left-right direction (a section hatched in the opposite direction to the left oil storage tank 36 in FIG. 7) serves as a large-capacity fuel tank 39 made up of the right oil storage tank 37 and the intermediate oil storage tank 38. Like the left oil storage tank 36, the fuel tank 39 is inclined obliquely downward from the rear side (rear end plate 17 side) to the front side (front frame 16 side) with the front wheels 2 and rear wheels 3 attached to the body frame 13.

[0049] In this manner, in this embodiment, the right oil storage tank 37 and the intermediate oil storage tank 38 form a large-capacity fuel tank 39. Therefore, the amount of fuel stored in the fuel tank 39 can be increased, and the traveling distance of the dump truck 1 can be increased. Moreover, in this embodiment, the left oil storage tank 36 that stores hydraulic oil and the fuel tank 39 that stores fuel are integrally formed with the vehicle body frame 13. Therefore, an increase in the vehicle weight of the dump truck 1 can be suppressed, as compared with, for example, a case in which a hydraulic oil tank and a fuel tank that are separate members from the vehicle body frame 13 are attached to the vehicle body frame 13.

[0050] Moreover, hydraulic oil is stored in a left oil storage tank 36 disposed on the left side of the body frame 13, and fuel is stored in a fuel tank 39 consisting of a right oil storage tank 37 disposed on the right side of the body frame 13 and an intermediate oil storage tank 38 disposed in the middle in the left-right direction. This makes it possible to maintain a good left-right weight balance of the body frame 13 in response to changes in the body weight caused by fuel consumption, and ensures stability during traveling of the dump truck 1. Furthermore, in this embodiment, a large space can be secured between the front wheels 2 and the rear wheels 3, compared to the conventional technology in which an oil storage tank made of a separate member from the body frame is attached between the front wheels and the rear wheels.

[0051] The hydraulic oil filler port 40 is provided in a position toward the rear from the center in the front-to-rear direction of the left oil storage tank 36. The hydraulic oil filler port 40 is disposed adjacent to the joint between the upper plate 18 and the left outer plate 14A that constitutes the left frame 14, and opens into the left oil storage tank 36. An oil filler nozzle (not shown) is connected to the hydraulic oil filler port 40 when supplying hydraulic oil to the left oil storage tank 36.

[0052] The hydraulic oil discharge port 41 is provided in a portion of the left oil storage tank 36 from the center toward the front in the front-rear direction. The hydraulic oil discharge port 41 is disposed adjacent to a joint between the lower plate 19 and the left inner plate 14B constituting the left frame 14, and opens into the left oil storage tank 36. As shown in Fig. 3, the hydraulic oil discharge port 41 is disposed near the hydraulic pump 11, and is configured so that a hydraulic line (not shown) connecting the hydraulic oil discharge port 41 and the hydraulic pump 11 can be made as short as possible.

[0053] The hydraulic oil return port 42 is provided in the left oil storage tank 36, spaced forward from the hydraulic oil supply port 40. The hydraulic oil return port 42 is located in a position on the left inner plate 14B that constitutes the left frame 14, above the hydraulic oil discharge port 41, and opens to the left oil storage tank 36. The hydraulic oil return port 42 is connected to a control valve (neither of which are shown) via a return pipe, and guides return oil from the various hydraulic actuators to the left oil storage tank 36.

[0054] The hydraulic oil level gauge 43 is provided in the left oil storage tank 36 adjacent to the hydraulic oil filler port 40. The hydraulic oil level gauge 43 is disposed in a portion of the left outer plate 14A that constitutes the left frame 14 that is below the hydraulic oil filler port 40. The level of the hydraulic oil stored in the left oil storage tank 36 can be visually observed from outside the body frame 13 using the hydraulic oil level gauge 43.

[0055] The hydraulic oil air breather 44 is provided in the left oil storage tank 36, spaced rearward from the hydraulic oil filler port 40. The hydraulic oil air breather 44 is disposed adjacent to the joint between the left outer plate 14A and the upper plate 18 (connection portion 18A) that constitute the left frame 14. When the dump truck 1 is in operation, the hydraulic oil air breather 44 intakes and exhausts air in accordance with the movement of hydraulic oil in the left oil storage tank 36, thereby adjusting the amount of air in the left oil storage tank 36.

[0056] The hydraulic oil drain port 45 is provided in the left oil storage tank 36, spaced forward from the hydraulic oil discharge port 41. The hydraulic oil drain port 45 is disposed in the left branch portion 18B of the lower plate 19 that constitutes the left frame 14, and opens into the left oil storage tank 36 near (at the rear of) the left partition plate 20. The hydraulic oil drain port 45 is closed by a lid, and by removing this lid, moisture, sludge, etc. that have accumulated at the bottom of the left oil storage tank 36 can be discharged to the outside.

[0057] The left oil storage tank 36, which constitutes the hydraulic oil tank, is inclined obliquely downward from the rear to the front with the front wheels 2 and rear wheels 3 attached to the body frame 13. For this reason, the hydraulic oil filler port 40, hydraulic oil level gauge 43, and hydraulic oil air breather 44 are designed to be located on the rear side of the left oil storage tank 36. On the other hand, the hydraulic oil discharge port 41 and hydraulic oil drain port 45 are designed to be located on the front side of the left oil storage tank 36.

[0058] The pressurized fuel filler port 46 is provided in a portion of the right fuel storage tank 37 that constitutes the fuel tank 39, from the center in the fore-and-aft direction toward the front. The pressurized fuel filler port 46 is disposed adjacent to the joint between the right outer plate 15A and the lower plate 19 (right branch portion 19C) that constitute the right frame 15, and opens into the right fuel storage tank 37. When fuel is supplied in a short period of time using a pressurized fuel supply device that pressurizes and pumps fuel, a nozzle of the pressurized fuel supply device (neither of which is shown) is connected to the pressurized fuel filler port 46.

[0059] The fuel filler port 47 is provided at the rear end of the intermediate oil storage tank 38 that constitutes the fuel tank 39. The fuel filler port 47 is disposed at the rear end of the top plate 18 (connecting portion 18A) that constitutes the intermediate oil storage tank 38, and opens into the intermediate oil storage tank 38. When a general refueling device other than the pressurized refueling device described above is used for refueling work, a refueling nozzle of this refueling device (neither of which is shown) is connected to the fuel filler port 47.

[0060] Fuel discharge port 48 is provided on the front end side of right oil storage tank 37 that constitutes fuel tank 39. Fuel discharge port 48 is disposed in a position adjacent to right partition plate 21 on right inner plate 15B that constitutes right frame 15, and opens into right oil storage tank 37. As shown in Fig. 3, fuel discharge port 48 is disposed in the vicinity of engine 10, and is configured so that a fuel supply pipe (not shown) that connects fuel discharge port 48 and engine 10 can be made as short as possible.

[0061] The fuel return port 49 is provided on the rear end side of the right oil storage tank 37 that constitutes the fuel tank 39. The fuel return port 49 is disposed on the rear end side of the lower plate 19 (connection portion 19A) that constitutes the right frame 15, and opens to the right oil storage tank 37. The fuel return port 49 is connected to the engine 10 via a return pipe (not shown), and returns fuel discharged from the engine 10 to the right oil storage tank 37 (fuel tank 39).

[0062] The fuel level gauge 50 is provided at the rear end of the intermediate oil storage tank 38 that constitutes the fuel tank 39. The fuel level gauge 50 is disposed at a position adjacent to the fuel filler port 47 on the top plate 18 (connecting portion 18A) that constitutes the intermediate oil storage tank 38. The level of the fuel stored in the fuel tank 39 can be visually observed from outside the body frame 13 using the fuel level gauge 50.

[0063] The fuel air breathers 51 are provided on the rear end sides of the right oil storage tank 37 and the intermediate oil storage tank 38 that constitute the fuel tank 39. The fuel air breathers 51 are disposed adjacent to the front side of the fuel filler port 47 on the upper plate 18 (connection portion 18A) that constitutes the right frame 15 and the intermediate oil storage tank 38. When the dump truck 1 is in operation, the fuel air breathers 51 intake and exhaust air in accordance with the movement of fuel in the right oil storage tank 37 and the movement of fuel in the intermediate oil storage tank 38, thereby adjusting the amount of air in the fuel tank 39.

[0064] The fuel drain port 52 is provided on the front end side of the right oil storage tank 37 that constitutes the fuel tank 39. The fuel drain port 52 is disposed in the right branch portion 19C of the lower plate 19 that constitutes the right frame 15, and opens into the right oil storage tank 37 at a position adjacent to the right partition plate 21. The fuel drain port 52 is closed by a lid, and moisture, sludge, etc. accumulated at the bottom of the right oil storage tank 37 can be discharged to the outside by removing this lid.

[0065] The fuel level sensor 53 is provided on the rear side of the intermediate oil storage tank 38 that constitutes the fuel tank 39. The fuel level sensor 53 is attached near the joint between the peripheral wall plate 23 and the top plate 18 (connection portion 18A) that constitute the intermediate oil storage tank 38, and is disposed forward of the fuel air breather 51. The fuel level sensor 53 sets an upper limit value of the fuel supplied to the fuel tank 39 through the fuel filler port 47 or the pressurized fuel filler port 46.

[0066] The fuel float sensor 54 is provided on the front side of the right oil storage tank 37 that constitutes the fuel tank 39. The fuel float sensor 54 is disposed in a portion of the right inner plate 15B that constitutes the right frame 15, near the right pillar 28. The fuel float sensor 54 has a float (not shown) that is disposed inside the right oil storage tank 37, and detects the remaining amount of fuel in the fuel tank 39 in response to the displacement of the float that accompanies a reduction in the amount of fuel in the right oil storage tank 37.

[0067] The fuel tank 39, consisting of the right oil storage tank 37 and the intermediate oil storage tank 38, is inclined obliquely downward from the rear to the front with the front wheels 2 and rear wheels 3 attached to the body frame 13. For this reason, the fuel filler port 47, fuel return port 49, fuel level gauge 50, fuel air breather 51, and fuel level sensor 53 are designed to be disposed on the rear side of the fuel tank 39. On the other hand, the fuel discharge port 48, fuel drain port 52, and fuel float sensor 54 are designed to be disposed on the front side of the fuel tank 39.

[0068] The dump truck 1 according to this embodiment has the configuration as described above, and when the dump truck 1 is used to transport crushed stone from a mine or the like, an operator in the cab 12A starts the engine 10, which drives the hydraulic pump 11, a generator, and the like (not shown). Electricity from the generator is supplied to an electric motor (not shown) of the traveling device 5, and the rear wheels 3 are driven to rotate, so that the dump truck 1 travels to the quarry.

[0069] Then, crushed stone excavated using a large hydraulic excavator or the like (not shown) is loaded onto the loading platform 7 of the dump truck 1 stopped at the quarry. The dump truck 1 loaded with the crushed stone travels to a specified collection site. At the collection site, hydraulic oil is supplied to the hoist cylinder 8 by the hydraulic pump 11, and the hoist cylinder 8 extends. As a result, the front side of the loading platform 7 rotates upward around the connecting pin 7A, and the crushed stone loaded on the loading platform 7 is discharged from the rear side of the loading platform 7 to the collection site.

[0070] In the dump truck 1 according to this embodiment, a left oil storage tank 36, a right oil storage tank 37, and an intermediate oil storage tank 38 are integrally formed with the vehicle body frame 13. The left oil storage tank 36 constitutes a hydraulic oil tank provided with a hydraulic oil filler port 40 and a hydraulic oil discharge port 41, and the right oil storage tank 37 and the intermediate oil storage tank 38 constitute a fuel tank 39 provided with a pressurized fuel filler port 46, a fuel filler port 47, and a fuel discharge port 48.

[0071] In this way, the right oil storage tank 37 and the intermediate oil storage tank 38 form a large-capacity fuel tank 39, so that the amount of fuel stored in the fuel tank 39 can be increased. In this case, there is no significant change to the structure of the body frame 13 itself, and there is no need to attach a hydraulic oil tank and a fuel tank, which are separate members from the body frame 13, to the body frame 13. Therefore, the amount of fuel stored in the fuel tank 39 can be increased without increasing the body weight of the dump truck 1, and the traveling distance of the dump truck 1 can be increased. As a result, the dump truck 1 according to this embodiment can increase the traveling distance by increasing the capacity of the fuel tank 39, and can increase the load capacity of the loading platform 7 by suppressing an increase in the body weight.

[0072] Moreover, compared to the conventional technology in which an oil storage tank made of a separate member from the vehicle body frame is attached between the front and rear wheels, the dump truck 1 according to this embodiment can ensure a large space between the front and rear wheels 2 and 3. As a result, when performing maintenance on the hoist cylinder 8, hydraulic pump 11, etc., arranged between the front and rear wheels 2 and 3, a large working space can be ensured around the hoist cylinder 8 and hydraulic pump 11, improving the workability of the maintenance work. Furthermore, since a hydraulic oil tank and a fuel tank made of a separate member from the vehicle body frame 13 are not required, this can contribute to reducing the manufacturing cost of the entire dump truck 1.

[0073] Thus, in this embodiment, the vehicle includes a body frame 13 to which the front wheels 2 and the rear wheels 3 are attached, and a loading platform 7 attached to the body frame 13 so as to be capable of being raised and lowered. The body frame 13 includes a left outer plate 14A disposed on the left side in the left-right direction and extending in the front-to-rear direction, a right outer plate 15A disposed on the right side in the left-right direction and extending in the front-to-rear direction, an upper plate 18 connecting upper ends of the left outer plate 14A and the right outer plate 15A, a lower plate 19 connecting lower ends of the left outer plate 14A and the right outer plate 15A and facing the upper plate 18 in the up-down direction, a left inner plate 14B disposed between the upper plate 18 and the lower plate 19 and extending in the front-to-rear direction while facing the left outer plate 14A in the left-to-right direction, and a left inner plate 14B disposed between the upper plate 18 and the lower plate 19. In the dump truck 1 including the right outer plate 14A, the left inner plate 14B, the upper plate 18, and the lower plate 19, a left oil storage tank 36 is formed having an airtight structure for storing oil therein, and is provided with an oil supply port (hydraulic oil supply 40) and a discharge port (hydraulic oil discharge port 41), and a right oil storage tank 37 is formed having an airtight structure for storing oil therein, and is provided with an oil supply port (pressurized fuel supply port 46) and a discharge port (fuel discharge port 48) surrounded by the right outer plate 15A, the right inner plate 15B, the upper plate 18, and the lower plate 19.

[0074] According to this configuration, for example, hydraulic oil can be stored in one of the left oil storage tank 36 and the right oil storage tank 37 formed integrally with the vehicle body frame 13, and fuel can be stored in the other. As a result, there is no need to attach a hydraulic oil tank and a fuel tank, which are separate members from the vehicle body frame 13, to the vehicle body frame 13, so that a sufficient capacity of the fuel tank can be secured without increasing the vehicle weight of the dump truck 1, and the travel distance of the dump truck 1 can be increased and the load capacity on the loading platform 7 can be increased.

[0075] In the embodiment, a rear end plate 17 is provided which connects the rear end of the left inner plate 14B and the rear end of the right inner plate 15B, and has an upper end connected to the upper plate 18 and a lower end connected to the lower plate 19. Between the left inner plate 14B and the right inner plate 15B, an intermediate plate 22 is provided which connects the left inner plate 14B and the right inner plate 15B at a position forward of the rear end plate 17, and has an upper end connected to the upper plate 18 and a lower end connected to the lower plate 19. The left inner plate 14B, the right inner plate 15B, the upper plate 18, the lower plate 19, the rear end plate 17 and the intermediate plate 22 form an intermediate oil storage tank 38 which is connected to either the left oil storage tank 36 or the right oil storage tank 37.

[0076] According to this configuration, by connecting the intermediate oil storage tank 38 to the oil storage tank (for example, the right oil storage tank 37) out of the left oil storage tank 36 and the right oil storage tank 37 in which fuel is stored, a large-capacity fuel tank 39 can be configured consisting of the right oil storage tank 37 and the intermediate oil storage tank 38. As a result, by further increasing the amount of fuel stored in the fuel tank 39, the traveling distance of the dump truck 1 can be significantly increased.

[0077] In the embodiment, the vehicle body frame 13 is mounted with the engine 10 that drives the hydraulic pump 11 and a hydraulic actuator that is supplied with hydraulic oil discharged from the hydraulic pump 11, and the fuel supplied to the engine 10 is stored in one of the left oil storage tank 36 and the right oil storage tank 37, and the hydraulic oil supplied to the hydraulic actuator is stored in the other of the left oil storage tank 36 and the right oil storage tank 37. With this configuration, it is possible to maintain a good left-right weight balance of the vehicle body frame 13 in response to changes in vehicle body weight due to fuel consumption, and it is possible to ensure stability during traveling of the dump truck 1.

[0078] In the embodiment, the hydraulic oil is stored in the left oil storage tank 36, and fuel is stored in the right oil storage tank 37 and the intermediate oil storage tank 38. However, the present invention is not limited to this, and for example, the hydraulic oil may be stored in the right oil storage tank 37, and fuel may be stored in the left oil storage tank 36 and the intermediate oil storage tank 38.

[0079] Also, in the embodiment, of the right oil storage tank 37 and the intermediate oil storage tank 38 that constitute the fuel tank 39, a case has been illustrated in which the fuel filler port 47 is provided in the intermediate oil storage tank 38 and the pressurized fuel filler port 46 is provided in the right oil storage tank 37. However, the present invention is not limited to this, and a configuration in which the fuel filler port is provided in the right oil storage tank 37, for example, has also been illustrated.

[0080] Also, in the embodiment, the intermediate oil storage tank 38 is surrounded by the left inner plate 14B, the right inner plate 15B, the rear end plate 17, the middle plate 22, the upper plate 18, and the lower plate 19, and is formed as a sealed space with a hollow inside the peripheral wall plate 23. However, the present invention is not limited to this, and for example, the intermediate oil storage tank may be formed as a sealed space surrounded by the left inner plate 14B, the right inner plate 15B, the rear end plate 17, the middle plate 22, the upper plate 18, and the lower plate 19 by removing the peripheral wall plate 23.

[0081] Also, in the embodiment, a case is exemplified in which the front end of the left oil storage tank 36 is closed by the left partition plate 20, and the front end of the right oil storage tank 37 is closed by the right partition plate 21. However, the present invention is not limited to this, and for example, a single partition plate may be provided in the front frame 16 connecting the front end of the left frame 14 and the front end of the right frame 15, and the front end of the left oil storage tank and the front end of the right oil storage tank may be closed by this single partition plate.

[0082] Furthermore, in the embodiment, the rear ends of the left oil storage tank 36 and the right oil storage tank 37 are closed by the rear end plate 17. However, the present invention is not limited to this, and for example, the rear end of the left oil storage tank may be closed by a partition plate arranged between the left outer plate 14A and the left inner plate 14B forward of the rear end plate 17, and the rear end of the right oil storage tank may be closed by a partition plate arranged between the right outer plate 15A and the right inner plate 15B forward of the rear end plate 17. [Explanation of symbols]

[0083] 1. Dump truck 2 Front wheels 3 Rear wheel 7 Cargo Bed 10 Engine 11 Hydraulic pump 13 Body frame 14A Left outer plate 14B Left inner plate 15A Right outer plate 15B Right inner plate 17 Rear end plate 18 Upper Plate 19 Lower plate 22 Intermediate plate 36 Left oil tank 37 Right Oil Tank 38 Intermediate Oil Storage Tank 40 Hydraulic oil filler port (filler port) 41 Hydraulic oil discharge port (discharge port) 46 Pressurized fuel filler (filler) 48 Fuel discharge port (discharge port)

Claims

1. The vehicle has a body frame to which wheels are attached, and a loading platform attached to the body frame so as to be capable of being raised and lowered; The vehicle body frame includes: A left outer plate disposed on the left side in the left-right direction and extending in the front-rear direction; A right outer plate disposed on the right side in the left-right direction and extending in the front-rear direction; an upper plate connecting upper ends of the left outer plate and the right outer plate; a lower plate that connects lower ends of the left outer plate and the right outer plate and faces the upper plate in the up-down direction; a left inner plate disposed between the upper plate and the lower plate, facing the left outer plate in the left-right direction and extending in the front-rear direction; A right inner plate is disposed between the upper plate and the lower plate and extends in a front-rear direction while facing the right outer plate in the left-right direction. a left oil storage tank is configured to have a sealed structure for storing oil therein, the left oil storage tank being surrounded by the left outer plate, the left inner plate, the upper plate, and the lower plate, and the left oil storage tank is provided with an oil supply port and an oil discharge port, a right oil storage tank that is surrounded by the right outer plate, the right inner plate, the upper plate, and the lower plate, has an sealed structure for storing oil inside, and is provided with an oil inlet and an oil outlet.

2. a rear end plate that connects between a rear end of the left inner plate and a rear end of the right inner plate, the rear end plate having an upper end connected to the upper plate and a lower end connected to the lower plate; an intermediate plate is provided between the left inner plate and the right inner plate, the intermediate plate connecting the left inner plate and the right inner plate at a position forward of the rear end plate, the intermediate plate having an upper end connected to the upper plate and a lower end connected to the lower plate; The dump truck of claim 1, characterized in that the left inner plate, the right inner plate, the upper plate, the lower plate, the rear end plate and the intermediate plate form an intermediate oil storage tank that is connected to either the left oil storage tank or the right oil storage tank.

3. The vehicle body frame includes: An engine that drives a hydraulic pump; a hydraulic actuator to which the hydraulic oil discharged from the hydraulic pump is supplied; Fuel supplied to the engine is stored in one of the left fuel storage tank and the right fuel storage tank, 2. The dump truck according to claim 1, wherein the hydraulic oil supplied to the hydraulic actuator is stored in the other of the left oil storage tank and the right oil storage tank.

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