JP2016196241A - Dump truck - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress deformation of a longitudinal frame due to a load acting on a load-carrying platform.SOLUTION: On a lower surface 22D side of a bottom plate 22, a reinforcement plate 43 is so provided as to be positioned between left and right longitudinal frames 27, 28 and between intermediate transverse frames 33C, 34C which are adjacent to each other in a front and rear direction. A left end of the reinforcement plate 43 is joined to the left longitudinal frame 27, a right end of the reinforcement plate 43 is joined to the right longitudinal frame 28, a front end of the reinforcement plate 43 is joined to the intermediate transverse frame 33, and a rear end of the reinforcement plate 43 is joined to an intermediate transverse frame 34C. Thus, a box structure 44 which is surrounded by the front and rear intermediate transverse frames 33C, 34C, the bottom plate 22 and the reinforcement plate 43, can be formed. Consequently, the left and right longitudinal frames 27, 28 are connected to each other via the front and rear intermediate transverse frames 33C, 34C and the box structure 44, and deformation of the left and right longitudinal frames 27, 28 can be suppressed.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a dump truck that is suitably used for transporting crushed stones or earth and sand mined in, for example, an open-pit mining site or mine.

  A dump truck as a representative example of a large transport vehicle includes a self-propelled vehicle body having a front wheel and a rear wheel, and a loading platform (see FIG. Vessel). The dump truck is self-propelled toward a loading place such as an export port or a collection place, with a large amount of crushed stone or earth and sand transported on the loading platform.

  The loading platform of the dump truck is usually composed of a flat plate, a left and right side plate extending upward from both left and right sides of the bottom plate, and a left and right side plate extending upward from the front end of the bottom plate. And a front plate that closes the front end of the front plate (see, for example, Patent Document 1).

  In addition, left and right vertical frames that extend forward and rearward in the left and right directions are spaced on the bottom surface of the bottom plate, and left and right sides that are spaced forward and backward in the bottom surface of the bottom plate. The left and right vertical frames are provided with left and right hinge brackets that are tiltably connected to the rear position of the vehicle body via hinge pins.

JP 2007-176269 A

  By the way, since a large amount of transported goods is loaded on the loading platform of the dump truck, a large load (load) acts on the loading platform. A load acting on the loading platform is transmitted to the vehicle body via left and right vertical frames, hinge brackets and the like provided on the lower surface side of the bottom plate.

  Here, the left and right vertical frames are provided over almost the entire length of the front and rear lengths of the bottom plate constituting the loading platform. Therefore, it is necessary to make a box structure using a thin plate material. Secures sufficient rigidity. On the other hand, the hinge brackets provided on the left and right vertical frames are subjected to a high load when the loading platform is tilted. Therefore, the necessary rigidity is ensured by using a relatively thick plate material.

  Thus, since the hinge bracket is formed using a thick plate material, the left and right vertical frames have lower rigidity than the hinge bracket. For this reason, when a load is applied to the loading platform, the periphery of the portion of the left and right vertical frames where the hinge brackets are joined is greatly deformed due to the difference in rigidity between the left and right vertical frames and the hinge brackets.

  As a result, stress concentration occurs at the joint between the left and right vertical frames and each horizontal frame. By repeating this stress concentration, the joint between the left and right vertical frames and each horizontal frame becomes There is a problem that fatigue accumulates and damage is likely to occur.

  On the other hand, it is conceivable to increase the thickness of the left and right vertical frames. In this case, the weight of the entire cargo bed increases, so that the load capacity of the load decreases and the dump truck runs. The fuel consumption rate (fuel consumption) at the time will deteriorate.

  The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to provide a dump truck capable of suppressing deformation of a vertical frame due to a load acting on a loading platform.

  In order to solve the above-described problems, the present invention provides a self-propelled vehicle body having a front wheel and a rear wheel, and a loading platform that can be tilted to the vehicle body with a rear position of the vehicle body as a fulcrum and loads a load. The loading platform includes a bottom plate made of a plate-like plate body, left and right side plates extending upward from both left and right sides of the bottom plate, and left and right extending upward from a front end of the bottom plate. A front plate that closes the front end of the side plate, left and right vertical frames extending in the left and right directions at intervals on the lower surface of the bottom plate, and left and right vertical frames extending forward and rearward on the lower surface of the bottom plate A plurality of horizontal frames extending in the left and right directions at intervals, and a left provided on the left and right vertical frames and tiltably connected to a rear position of the vehicle body via a hinge pin serving as the fulcrum , A right hinge bracket, and the horizontal frame and the left side plate A left horizontal frame positioned between the left vertical frame, a right horizontal frame positioned between the right side plate and the right vertical frame, and an intermediate horizontal frame positioned between the left and right vertical frames. It is applied to the dump truck that is composed.

  According to a first aspect of the present invention, the bottom horizontal plate is located between the left and right vertical frames and is adjacent to each other in the front and rear directions among the intermediate horizontal frames. A reinforcing member is provided between them, and the reinforcing member is joined to the left and right vertical frames and the adjacent front and rear intermediate horizontal frames.

  The invention according to claim 2 is characterized in that each of the intermediate horizontal frames is fixed so as to hang downward from the lower surface of the bottom plate while facing each other in the front and rear directions, and the front and rear fixing portions; The rear fixed portions are connected to each other, and the bottom plate is connected to the connecting portions facing upward and downward, and the reinforcing member is formed by a flat reinforcing plate that connects the adjacent front and rear intermediate horizontal frames. The reinforcing plate is configured to be arranged on substantially the same plane as the connecting portion of the adjacent front and rear intermediate horizontal frames.

  According to a third aspect of the present invention, the left and right hinge brackets are arranged on the lower surface side of the bottom plate so as to extend forward and rearward, and the reinforcing member is at least sandwiched between the left and right hinge brackets. There is a configuration to provide.

  According to a fourth aspect of the present invention, the left and right hinge brackets are arranged on the lower surface side of the bottom plate so as to extend in the front and rear directions, and the reinforcing member extends from the front end of the left and right hinge brackets to the front plate. It is that it was set as the structure provided in the range.

  According to a fifth aspect of the present invention, the reinforcing member is provided with a through hole penetrating upward and downward in order to reduce the weight of the reinforcing member.

  According to the first aspect of the present invention, the left and right vertical frames are integrated via the reinforcing members by joining the reinforcing members disposed between the left and right vertical frames to the left and right vertical frames, respectively. Therefore, it is possible to prevent the left and right vertical frames from being deformed by a load acting on the loading platform. In addition, since the reinforcing members are joined to the front and rear intermediate horizontal frames adjacent to each other in the front and rear directions, the front and rear intermediate horizontal frames and the bottom plate are disposed between the adjacent front and rear intermediate horizontal frames. And a box structure surrounded by the reinforcing member can be formed. Therefore, the left and right vertical frames can be firmly connected via the front and rear intermediate horizontal frames and the box structure formed between the front and rear intermediate horizontal frames. As a result, by suppressing the deformation of the left and right vertical frames, the joint between the left and right vertical frames and the intermediate horizontal frame, the joint between the left vertical frame and the left horizontal frame, the right vertical frame and the right horizontal It is possible to prevent stress from concentrating on the joint with the frame.

  As a result, the rigidity of the entire cargo bed can be increased. Further, by providing reinforcing members between the left and right vertical frames and between the front and rear intermediate horizontal frames, it is not necessary to increase the thickness of the left and right vertical frames themselves. Accordingly, it is possible to suppress an increase in the weight of the entire loading platform and to secure a sufficient load capacity of the transported item.

1 is a front view showing a dump truck according to a first embodiment of the present invention. It is a front view which shows the loading platform of a dump truck alone. It is the bottom view which looked at the loading platform from the arrow III-III direction in FIG. It is sectional drawing which looked at the loading platform from the arrow IV-IV direction in FIG. It is the disassembled perspective view which looked at the bottom plate of the loading platform, the left and right vertical frames, the horizontal frame, and the reinforcing plate from the lower surface side of the loading platform. FIG. 5 is an enlarged cross-sectional view showing a right vertical frame, an intermediate horizontal frame, a reinforcing plate and the like in FIG. 4. It is a diagram which shows the magnitude | size of the load which acts on each pad and hinge pin of a loading platform. It is a bottom view similar to FIG. 3 which shows the loading platform by 2nd Embodiment. It is sectional drawing which looked at the loading platform from the arrow IX-IX direction in FIG. It is a bottom view similar to FIG. 3 which shows the loading platform by 3rd Embodiment. It is sectional drawing which looked at the loading platform from the arrow XI-XI direction in FIG. It is a bottom view similar to FIG. 3 which shows the loading platform by 4th Embodiment. It is sectional drawing which looked at the loading platform from the arrow XIII-XIII direction in FIG. It is a disassembled perspective view similar to FIG. 5 which shows the modification of the loading platform by 1st Embodiment.

  Hereinafter, embodiments of a dump truck according to the present invention will be described in detail with reference to FIGS.

  1 to 7 show a first embodiment of the present invention. In the figure, a dump truck 1 which is a large transport vehicle transports transported materials such as crushed stones mined in a mine. The dump truck 1 is roughly constituted by a vehicle body 2 that can be self-propelled and a loading platform (vessel) 21 that is mounted on the vehicle body 2 so as to be tiltable (can be undulated) for loading a transported object.

  The vehicle body 2 constitutes the main body of the dump truck 1. The vehicle body 2 includes a vehicle body frame 3 serving as a base, a building 9 described later, and a floor 11. On the rear end side of the vehicle body frame 3, a pair of left and right loading platform support brackets 3A (only the left side is shown) are provided. Hinge brackets 39 and 40 of the loading platform 21, which will be described later, are connected to the loading platform support brackets 3A via hinge pins 41 so as to be tiltable.

  Further, the body frame 3 is provided with a pair of left and right cylinder mounting brackets 3B (only the left side is shown) positioned between a front wheel 4 and a rear wheel 6 which will be described later. The cylinder mounting bracket 3B is attached to the lower end side of a hoist cylinder 14 described later.

  The left and right front wheels 4 are rotatably provided on the front side of the vehicle body 2. The left and right front wheels 4 constitute steering wheels that are steered (steered) by an operator of the dump truck 1. The left and right front wheels 4 are formed, for example, with a tire diameter (outside diameter dimension) ranging from 2 to 4 meters.

  The left and right front wheel side suspensions 5 elastically support the left and right front wheels 4 with respect to the vehicle body 2 (only the left side is shown). The front wheel side suspension 5 is configured by, for example, a hydraulic shock absorber, and is attached between a trailing arm (not shown) that supports the front wheel 4 and the vehicle body frame 3 so as to be extendable and contractable. The front-wheel-side suspension 5 buffers the vibration transmitted to the vehicle body 2 when the front wheel 4 vibrates due to road surface unevenness or the like.

  The left and right rear wheels 6 are rotatably provided on the rear side of the vehicle body 2. The left and right rear wheels 6 are rotationally driven by the travel drive device 7 and constitute drive wheels of the dump truck 1. Left and right rear wheel side suspensions 8 are provided between the travel drive device 7 and the vehicle body frame 3 (only the left side is shown). The rear wheel side suspension 8 is constituted by, for example, a hydraulic shock absorber, and buffers the vibration of the rear wheel 6 transmitted to the vehicle body 2.

  The building 9 is provided on the front end side of the body frame 3. The building 9 defines a machine room on the front side of the vehicle body 2, and houses therein an engine 10 as a prime mover, a radiator, and the like (not shown). On the other hand, the building 9 also has a function of supporting a floor 11, a cab 12, and the like described later from below.

  The floor 11 is provided on the upper side of the building 9. The floor 11 has a flat plate shape extending in the horizontal direction, and is supported by the building 9 and an upper horizontal beam (not shown) attached to the vehicle body frame 3 in a state extending in the horizontal direction. On the floor 11, a cab 12, a control cabinet 13, and the like that define a cab are installed. The control cabinet 13 controls the operation of a generator driven by the engine 10, a travel motor of the travel drive device 7, and the like.

  The left and right hoist cylinders 14 (only the left side is shown) tilts (raises) a loading platform 21 described later with respect to the vehicle body 2. Each hoist cylinder 14 is provided between a cylinder mounting bracket 3 </ b> B of the vehicle body frame 3 and cylinder brackets 37 and 38, which will be described later, of the loading platform 21. By expanding and contracting each hoist cylinder 14, the loading platform 21 tilts upward and downward with respect to the vehicle body frame 3 with a hinge pin 41 described later as a fulcrum.

  Next, the loading platform 21 provided on the vehicle body 2 so as to be tiltable will be described.

  The loading platform 21 is provided on the vehicle body 2 so as to be tiltable, and is used for loading a transported object. The loading platform 21 is formed as a large container having a total length of 10 to 14 m (meters) in order to load a large amount of crushed stones, for example. The loading platform 21 includes a bottom plate 22, left and right side plates 23 and 24, a front plate 25, a roof plate 26, left and right vertical frames 27 and 28, and a plurality of horizontal frames 29 to 36. The left and right cylinder brackets 37 and 38, a plurality of pads 42 </ b> A to 42 </ b> E, left and right hinge brackets 39 and 40, and a reinforcing plate 43 are configured.

  The bottom plate 22 forms the bottom surface of the loading platform 21. The bottom plate 22 is formed as a flat plate extending in the front and rear directions using, for example, a steel plate material. The bottom plate 22 is inclined obliquely upward from the front end portion 22A toward the rear end portion 22B in a state where the loading platform 21 is mounted on the vehicle body frame 3. Transport material such as earth and sand is loaded on the upper surface 22C of the bottom plate 22, and left and right vertical frames 27 and 28, horizontal frames 29 to 36, left and right cylinder brackets 37, 38, left and right hinge brackets 39, 40, a reinforcing plate 43, and the like.

  The left and right side plates 23 and 24 form the left and right wall surfaces of the loading platform 21 and extend upward from the left and right sides of the bottom plate 22. The left and right side plates 23 and 24 are formed, for example, as plate-like plates extending in the front and rear directions using a steel plate material, and face in the left and right directions with the bottom plate 22 interposed therebetween.

  Here, the lower end side of the left side plate 23 is joined to the left end portion of the bottom plate 22 by welding, and the front end side of the left side plate 23 is joined to the left end portion of the front plate 25 described later by welding. A left protruding plate 23 </ b> A that protrudes forward is provided on the front upper end side of the left side plate 23. On the other hand, the lower end side of the right side plate 24 is joined to the right end portion of the bottom plate 22 by welding, and the front end side of the right side plate 24 is joined to the right end portion of the front plate 25 by welding. A right protruding plate 24 </ b> A protruding forward is provided on the upper end side of the front portion of the right side plate 24.

  The front plate 25 forms a wall surface on the front side of the loading platform 21. The front plate 25 is formed, for example, as a flat plate extending obliquely upward using a steel plate material. The lower end portion 25A of the front plate 25 is joined to the front end portion 22A of the bottom plate 22, and the front plate 25 is inclined obliquely upward from the front end portion 22A of the bottom plate 22 toward the front. A plate 26 described later is joined to the upper end 25B of the front plate 25 by welding. The left end portion of the front plate 25 is joined to the front end side of the left side plate 23 by welding, and the right end side of the front plate 25 is joined to the front end side of the right side plate 24 by welding. As a result, the front sides of the left and right side plates 23 and 24 are closed by the front plate 25.

  In this way, the bottom plate 22, the left and right side plates 23 and 24, and the front plate 25 are joined to each other, so that an accommodation space for the loading platform 21 that accommodates transported materials such as earth and sand is formed on the upper surface 22C side of the bottom plate 22. Has been.

  The saddle plate 26 covers the cab 12 and the control cabinet 13 of the dump truck 1 shown in FIG. 1 from above. The eaves plate 26 is formed as a flat plate extending in the front and rear directions using, for example, a steel plate material. The rear end portion of the cover plate 26 is joined to the upper end portion 25B of the front plate 25, and the front end portion of the cover plate 26 extends to the front end position of the floor 11 on which the cab 12, the control cabinet 13 and the like are mounted. The left end portion of the collar plate 26 is joined to the left protruding plate 23A of the left side plate 23 by welding, and the right end portion of the collar plate 26 is joined to the right protruding plate 24A of the right side plate 24 by welding.

  The left and right vertical frames 27 and 28 are provided on the lower surface 22D of the bottom plate 22 and extend in the left and right directions with an interval in the front and rear directions. The left and right vertical frames 27 and 28 constitute the base of the loading platform 21 together with the horizontal frames 29 to 36 described later, and are tilted to the vehicle body frame 3 via left and right hinge brackets 39 and 40 described later. Installed as possible.

  As shown in FIGS. 2 to 5, the left and right vertical frames 27 and 28 are formed as a frame extending in the front and rear directions using, for example, a steel material having a U-shaped cross section. The left and right vertical frames 27 and 28 are disposed in the middle portion of the bottom plate 22 in the left and right directions, and extend in the front and rear directions with an interval in the left and right directions. The upper ends of the left and right vertical frames 27 and 28 are joined to the lower surface 22D of the bottom plate 22 by welding, respectively.

  The left vertical frame 27 is located on the front side from the middle part in the front and rear directions and has a large protruding amount from the lower surface 22D of the bottom plate 22, and the bottom plate 22 located on the rear side from the middle part in the front and rear directions. The rear frame portion 27B has a small protruding amount from the lower surface 22D. The front side of the front frame portion 27A is gently bent from the rear frame portion 27B to the left side (direction away from the right vertical frame 28). A left hinge bracket 39 to be described later is provided at a boundary portion between the front frame portion 27A and the rear frame portion 27B of the left vertical frame 27. Pads 42A to 42E, which will be described later, are fixed to the front frame portion 27A of the left vertical frame 27.

  On the other hand, the right vertical frame 28 is located on the front side from the middle part in the front / rear direction and is located on the rear side from the middle part in the front / rear direction and the front frame part 28A having a large protruding amount from the lower surface 22D of the bottom plate 22. The rear frame portion 28B has a small protrusion amount from the lower surface 22D of the bottom plate 22. The front side of the front frame portion 28A is gently bent from the rear frame portion 28B to the right side (the direction away from the left vertical frame 27). A right hinge bracket 40, which will be described later, is provided at the boundary between the front frame portion 28A and the rear frame portion 28B of the right vertical frame 28. Pads 42A to 42E, which will be described later, are fixed to the front frame portion 28A of the right vertical frame 28.

  A plurality of (for example, eight) horizontal frames 29, 30, 31, 32, 33, 34, 35, and 36 are provided on the lower surface 22D of the bottom plate 22 together with the left and right vertical frames 27 and 28. That is, on the lower surface 22D of the bottom plate 22, the first horizontal frame 29, the second horizontal frame 30, the third horizontal frame 31, the fourth horizontal frame 32, the fifth horizontal frame 33, 6 are counted from the front side. A seventh horizontal frame 34, a seventh horizontal frame 35, and an eighth horizontal frame 36 are provided. Each of the horizontal frames 29 to 36 is formed as a frame body extending left and right using, for example, a steel material having a U-shaped cross section, and extends left and right with a gap in the front and rear directions. Each horizontal frame 29 to 36 is joined to the lower surface 22D of the bottom plate 22 by welding.

  As shown in FIGS. 3 and 4, the first horizontal frame 29 counted from the front side includes a left horizontal frame 29 </ b> A located between the left side plate 23 and the left vertical frame 27, a right side plate 24, and a right vertical frame 28. And a right horizontal frame 29B located between the left and right vertical frames 27 and 28 and an intermediate horizontal frame 29C located between the left and right vertical frames 27 and 28. Here, the intermediate horizontal frame 29C faces the front and rear directions with a gap therebetween, and the front fixing portion 29C1 and the rear fixing portion 29C2 are fixed to the lower surface 22D so as to hang downward from the lower surface 22D of the bottom plate 22. The front and rear fixing portions 29C1 and 29C2 are connected to each other, and are configured by a lower surface 22D of the bottom plate 22 and a connecting portion 29C3 facing upward and downward.

  Similarly, each horizontal frame 30, 31, 32, 33, 34, 35, 36 includes a left horizontal frame 30A, 31A, 32A, 33A, 34A, 35A, 36A, a right side plate 24 and a right vertical frame 28. Right horizontal frames 30B, 31B, 32B, 33B, 34B, 35B, 36B located between the middle horizontal frames 30C, 31C, 32C, 33C, 34C, 35C located between the left and right vertical frames 27, 28. , 36C. The eighth horizontal frame 36 from the front side (the rearmost part) has a left horizontal frame 36A, a right horizontal frame 36B, and an intermediate horizontal frame 36C integrated.

  Further, the intermediate horizontal frames 30C, 31C, 32C, 33C, 34C, 35C include front fixing portions 30C1, 31C1, 32C1, 33C1, 34C1, 35C1, rear fixing portions 30C2, 31C2, 32C2, 33C2, 34C2, 35C2, It is comprised by the connection part 30C3, 31C3, 32C3, 33C3, 34C3, 35C3.

  The left and right cylinder brackets 37 and 38 are provided on the lower surface 22D side of the bottom plate 22, and the upper end side of the hoist cylinder 14 is attached thereto. The left cylinder bracket 37 is disposed on the left side with the left and right vertical frames 27 and 28 interposed therebetween, and is joined to the lower surface 22D of the bottom plate 22 and the left horizontal frames 30A and 31A of the horizontal frames 30 and 31. On the other hand, the right cylinder bracket 38 is disposed on the right side with the left and right vertical frames 27 and 28 interposed therebetween, and is joined to the lower surface 22D of the bottom plate 22 and the right horizontal frames 30B and 31B of the horizontal frames 30 and 31. . The upper ends of the left and right hoist cylinders 14 (only the left side is shown in FIG. 1) are pin-coupled to the left and right cylinder brackets 37 and 38.

  The left and right hinge brackets 39 and 40 are provided on the left and right vertical frames 27 and 28, respectively, and are tiltably connected to the loading platform support bracket 3A of the vehicle body frame 3. The left hinge bracket 39 is formed using, for example, two steel plates thicker than the left vertical frame 27, and is joined to a boundary portion between the front frame portion 27A and the rear frame portion 27B of the left vertical frame 27 by welding. ing. On the other hand, the right hinge bracket 40 is formed using, for example, two steel plates thicker than the right vertical frame 28, and welded to the boundary between the front frame portion 28A and the rear frame portion 28B of the right vertical frame 28. It is joined.

  In this case, as shown in FIGS. 3 and 4, the left and right hinge brackets 39, 40 extend forward and rearward over the three horizontal frames 33, 34, 35. The front end portions 39 </ b> A and 40 </ b> A are arranged at positions corresponding to the horizontal frame 33. The left and right hinge brackets 39 and 40 are attached to the loading platform support bracket 3A of the vehicle body frame 3 via a hinge pin 41 so as to be tiltable (see FIG. 1).

  Accordingly, by extending and retracting the hoist cylinder 14 provided between the left and right cylinder brackets 37, 38 of the loading platform 21 and the vehicle body frame 3, the loading platform 21 is centered on the hinge pin 41 that is a connecting portion with the vehicle body frame 3. Tilts up and down. Thereby, the transported material such as earth and sand loaded on the loading platform 21 is discharged from the rear end portion 22B of the bottom plate 22 to the outside.

  The plurality of pads 42A, 42B, 42C, 42D, 42E buffer the load acting on the loading platform 21 from being transmitted to the vehicle body frame 3, and the front frame portions 27A, 28A of the left and right vertical frames 27, 28. Are provided respectively. Each of the pads 42A to 42E is formed in a square plate shape using an elastic material such as rubber, and five sheets are provided on the front frame portions 27A and 28A of the left and right vertical frames 27 and 28 with an interval in the front and rear directions. It is fixed one by one. In other words, the left and right vertical frames 27 and 28 are provided with pads 42A, 42B, 42C, 42D, and 42E in order from the front side.

  Here, when a load is loaded on the loading platform 21, the load from the loading platform 21 acts on the hinge pin 41 and the pads 42A to 42E as shown in FIG. That is, the load from the loading platform 21 mainly acts on the hinge pin 41, and a large load gradually acts on each of the pads 42A to 42E from the rear side (42E) to the front side (42A). Therefore, it is necessary to ensure the rigidity around the left and right hinge brackets 39 and 40 to which the hinge pins 41 are attached in the loading platform 21.

  Next, in order to reinforce the periphery of the left and right hinge brackets 39 and 40 in the loading platform 21, the reinforcing plate 43 used in the first embodiment will be described.

  The reinforcing plate 43 as a reinforcing member reinforces the periphery of the left and right hinge brackets 39 and 40 and suppresses deformation of the left and right vertical frames 27 and 28. The reinforcing plate 43 is formed as a rectangular flat plate using a steel plate material. As shown in FIGS. 3 to 6, the reinforcing plate 43 is located between the left and right vertical frames 27 and 28, and between the intermediate horizontal frames 33C and 34C of the horizontal frames 33 and 34 adjacent in the front and rear directions. It is provided in the position. In this case, the intermediate horizontal frame 33C positioned on the front side and the intermediate horizontal frame 34C positioned on the rear side are disposed between the left and right hinge brackets 39 and 40, and the reinforcing plate 43 is disposed on each hinge bracket 39 and 40. It is provided in the range to be sandwiched.

  Here, as shown in FIG. 6, the intermediate horizontal frame 33C located on the front side is integrally formed in a U-shaped cross section. That is, the intermediate horizontal frame 33C is formed by a front fixing portion 33C1 and a rear fixing portion 33C2 that face each other in the front and rear directions, and a connecting portion 33C3 that connects the front and rear fixing portions 33C1 and 33C2. Yes. The upper ends of the respective fixing portions 33C1 and 33C2 become fixed ends fixed to the lower surface 22D of the bottom plate 22, and the lower ends of the respective fixing portions 33C1 and 33C2 hang downward from the lower surface 22D of the bottom plate 22 through the connecting portion 33C3. It is connected. On the other hand, the intermediate horizontal frame 34C located on the rear side is also integrally formed by the front fixing portion 34C1, the rear fixing portion 34C2, and the connecting portion 34C3. The upper ends of the respective fixed portions 34C1 and 34C2 become fixed ends fixed to the lower surface 22D of the bottom plate 22, and the lower ends of the respective fixed portions 34C1 and 34C2 hang downward from the lower surface 22D of the bottom plate 22 through the connecting portion 34C3. It is connected.

  The left and right length dimensions of the reinforcing plate 43 correspond to the left and right intervals of the left and right vertical frames 27 and 28. The left end of the reinforcing plate 43 is joined to the inner surface of the left vertical frame 27 facing the right vertical frame 28 by welding, and the right end of the reinforcing plate 43 is the inner surface of the right vertical frame 28 facing the left vertical frame 27. Are joined by welding.

  The length dimension in the front and rear directions of the reinforcing plate 43 corresponds to the distance in the front and rear directions of the intermediate horizontal frames 33C and 34C. The front end of the reinforcing plate 43 is joined to the connecting portion 33C3 of the intermediate horizontal frame 33C located on the front side by welding, and the rear end of the reinforcing plate 43 is joined to the connecting portion 34C3 of the intermediate horizontal frame 34C located on the rear side by welding. Has been. In this case, the reinforcing plate 43 forms substantially the same plane as the connecting portion 33C3 of the intermediate horizontal frame 33C and the connecting portion 34C3 of the intermediate horizontal frame 34C. Thereby, the load from the loading platform 21 can be smoothly transmitted between the intermediate horizontal frames 33C and 34C via the reinforcing plate 43, and stress is concentrated at the joint between the intermediate horizontal frames 33C and 34C and the reinforcing plate 43. It becomes the composition which suppresses.

  In this way, the reinforcing plate 43 is joined to the inner side surfaces of the left and right vertical frames 27 and 28, the front and rear intermediate horizontal frames 33C and 34C adjacent to each other in the front and rear directions, respectively. Thereafter, weld beads 43A are formed on the left and right edge portions. The reinforcing plate 43 includes a box structure 44 surrounded by the front and rear intermediate horizontal frames 33C and 34C, the bottom plate 22, and the reinforcing plate 43 between the adjacent front and rear intermediate horizontal frames 33C and 34C. Form. As a result, the left and right vertical frames 27 and 28 are connected via the front and rear intermediate horizontal frames 33C and 34C and the box structure 44 formed between the front and rear intermediate horizontal frames 33C and 34C. The structure is firmly connected, and the deformation of the left and right vertical frames 27 and 28 can be suppressed.

  The dump truck 1 according to the first embodiment has the loading platform 21 as described above. Next, the operation thereof will be described.

  The dump truck 1 loads a transported object such as a crushed stone on a loading platform 21 using, for example, a large hydraulic excavator (not shown) in order to transport the crushed stone or earth and sand mined in a mine or the like. After loading a load on the loading platform 21, the operator who has boarded the cab 12 operates a traveling operation device (not shown), so that the dump truck 1 travels toward the unloading site.

  In a state where the dump truck 1 has arrived at the unloading site, an operator in the cab 12 operates an operating device (not shown) for tilting the loading platform 21, whereby the hoist cylinder 14 extends. Thereby, the loading platform 21 can rotate upward with the hinge pin 41 as a fulcrum, and can discharge the material loaded on the loading platform 21 so as to slide down from the rear end portion 22B of the bottom plate 22.

  Here, since a large amount of transported goods is loaded on the loading platform 21, a large load (load) acts on the loading platform 21, and this load is applied to the left and right vertical frames provided on the lower surface 22 </ b> D side of the bottom plate 22. 27, 28, left and right hinge brackets 39, 40, hinge pins 41, pads 42A to 42E, etc., are transmitted to the body frame 3. As described above, when a large load is applied to the loading platform 21, the peripheral portions of the hinge brackets 39 and 40 of the left and right vertical frames 27 and 28 tend to be deformed by the load.

  On the other hand, the first embodiment is located between the left and right vertical frames 27 and 28 on the lower surface 22D side of the bottom plate 22 and between the intermediate horizontal frames 33C and 34C adjacent in the front and rear directions. A reinforcing plate 43 is provided. Then, the left end of the reinforcing plate 43 is joined to the left vertical frame 27, the right end of the reinforcing plate 43 is joined to the right vertical frame 28, the front end of the reinforcing plate 43 is joined to the intermediate horizontal frame 33C, and the rear end of the reinforcing plate 43 Are joined to the intermediate horizontal frame 34C.

  Thereby, since the left and right vertical frames 27 and 28 can be integrated via the reinforcing plate 43, the deformation of the left and right vertical frames 27 and 28 is suppressed by the load acting on the loading platform 21. Can do. In addition, since the reinforcing plate 43 is joined to the adjacent intermediate horizontal frames 33C and 34C in the front and rear directions, respectively, the front and rear intermediate horizontal frames are disposed between the adjacent front and rear intermediate horizontal frames 33C and 34C. A box structure 44 surrounded by 33C, 34C, the bottom plate 22, and the reinforcing plate 43 can be formed.

  Accordingly, between the left and right vertical frames 27 and 28 via the front and rear intermediate horizontal frames 33C and 34C and the box structure 44 formed between the front and rear intermediate horizontal frames 33C and 34C. By firmly connecting, deformation of the left and right vertical frames 27 and 28 to which the left and right hinge brackets 39 and 40 are attached can be suppressed. As a result, the joints between the vertical frames 27 and 28 and the intermediate horizontal frames 33C and 34C, the joints between the left vertical frame 27 and the left horizontal frames 33A and 34A, and the right vertical frame 28 and the right horizontal frames 33B and 34B. It is possible to suppress the concentration of stress at the joint, and the rigidity of the entire loading platform 21 can be increased.

  Moreover, it is not necessary to increase the thickness of the left and right vertical frames 27 and 28 themselves by providing the reinforcing plate 43, and the weight of the entire loading platform 21 is greatly increased by using the flat reinforcing plate 43. It is possible to suppress this, and a sufficient load capacity can be secured.

  In this case, in the front intermediate horizontal frame 33C, the upper ends (fixed ends) of the front and rear fixing portions 33C1 and 33C2 are fixed to the lower surface 22D of the bottom plate 22, and the lower ends of the fixing portions 33C1 and 33C2 are the lower surfaces of the bottom plate 22, respectively. It hangs down from 22D and is connected via a connecting portion 33C3. On the other hand, in the rear intermediate horizontal frame 34C, the upper ends (fixed ends) of the front and rear fixed portions 34C1 and 34C2 are fixed to the lower surface 22D of the bottom plate 22, and the lower ends of the respective fixed portions 34C1 and 34C2 are the lower surfaces of the bottom plate 22 It hangs down from 22D and is connected via a connecting portion 34C3. The reinforcing plate 43 forms substantially the same plane as the connecting portion 33C3 of the intermediate horizontal frame 33C and the connecting portion 34C3 of the intermediate horizontal frame 34C.

  As a result, the load from the loading platform 21 can be smoothly transmitted to the intermediate horizontal frames 33C and 34C via the reinforcing plate 43, and stress is concentrated at the joint between the intermediate horizontal frames 33C and 34C and the reinforcing plate 43. Can be suppressed. As a result, the effect of suppressing the deformation of the vertical frames 27 and 28 by the reinforcing plate 43 can be maintained over a long period of time, and the reliability of the loading platform 21 can be enhanced.

  Next, FIG. 8 and FIG. 9 show a second embodiment of the present invention, and the feature of the second embodiment is that it is sandwiched between left and right hinge brackets among a plurality of intermediate lateral frames. This is because two reinforcing members are provided. In the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  The loading platform 51 used in the second embodiment is similar to the loading platform 21 according to the first embodiment, such as a bottom plate 22, left and right side plates 23 and 24, a front plate 25, a roof plate 26, Left and right vertical frames 27 and 28, a plurality of horizontal frames 29 to 36, left and right cylinder brackets 37 and 38, a plurality of pads 42A to 42E, left and right hinge brackets 39 and 40, The reinforcing plate 43 is included.

  However, the loading platform 51 according to the second embodiment is provided with a total of two reinforcing plates, that is, a reinforcing plate 43 and a reinforcing plate 52 described later, in a range between the left and right hinge brackets 39 and 40. This is different from the loading platform 21 according to the first embodiment.

  The reinforcing plate 52 is provided on the rear side of the reinforcing plate 43, reinforces the periphery of the left and right hinge brackets 39 and 40 together with the reinforcing plate 43, and suppresses deformation of the left and right vertical frames 27 and 28. is there. The reinforcing plate 52 is formed as a rectangular flat plate using a steel plate material, is positioned between the left and right vertical frames 27 and 28, and is an intermediate horizontal frame between the horizontal frames 34 and 35 adjacent in the front and rear directions. It is provided between 34C and 35C. In this case, the intermediate horizontal frame 34C positioned on the front side and the intermediate horizontal frame 35C positioned on the rear side are disposed between the left and right hinge brackets 39 and 40, and the reinforcing plate 52 and the reinforcing plate 43 together with each hinge. It is provided in a range between the brackets 39 and 40.

  The left end of the reinforcing plate 52 is joined to the inner side surface of the left vertical frame 27 by welding, and the right end of the reinforcing plate 52 is joined to the inner side surface of the right vertical frame 28 by welding. The front end of the reinforcing plate 52 is joined by welding to the connecting portion 34C3 of the intermediate horizontal frame 34C located on the front side, and the rear end of the reinforcing plate 52 is joined to the connecting portion 35C3 of the intermediate horizontal frame 35C located on the rear side by welding. Has been. In this case, the reinforcing plate 52 forms substantially the same plane as the connecting portion 34C3 of the intermediate horizontal frame 34C and the connecting portion 35C3 of the intermediate horizontal frame 35C.

  As described above, the reinforcing plate 52 is joined to the inner side surfaces of the left and right vertical frames 27 and 28 and the front and rear intermediate horizontal frames 34C and 35C, respectively. Is formed. As a result, the box structure 44 formed between the intermediate horizontal frames 33C and 34C is surrounded by the front and rear intermediate horizontal frames 34C and 35C, the bottom plate 22 and the reinforcing plate 52 on the rear side. A body 53 can be formed.

  The dump truck 1 according to the second embodiment has the loading platform 51 as described above, and the basic operation thereof is not particularly different from the loading platform 21 according to the first embodiment.

  However, the loading platform 51 according to the second embodiment is provided with the reinforcing plate 43 between the intermediate horizontal frames 33C and 34C adjacent in the front and rear directions, and on the rear side of the reinforcing plate 43 in the front and rear directions. The reinforcing plate 52 is provided between the adjacent intermediate horizontal frames 34C and 35C.

  Thereby, the loading platform 51 includes intermediate horizontal frames 33C, 34C, and 35C, a box structure 44 formed between the intermediate horizontal frames 33C and 34C, and a box structure 53 formed between the intermediate horizontal frames 34C and 35C. Thus, the left and right vertical frames 27 and 28 can be firmly connected to each other. As a result, the deformation of the left and right vertical frames 27 and 28 to which the left and right hinge brackets 39 and 40 are attached can be reliably suppressed.

  Next, FIG. 10 and FIG. 11 show a third embodiment of the present invention, and the feature of the third embodiment is that a range sandwiched between left and right hinge brackets among a plurality of intermediate lateral frames, A total of six reinforcing members are provided in the range from the front end of each hinge bracket to the front plate of the loading platform. In the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  Similar to the loading platform 21 according to the first embodiment, the loading platform 61 used in the third embodiment includes a bottom plate 22, left and right side plates 23 and 24, a front plate 25, a roof plate 26, Left and right vertical frames 27 and 28, a plurality of horizontal frames 29 to 36, left and right cylinder brackets 37 and 38, a plurality of pads 42A to 42E, left and right hinge brackets 39 and 40, The reinforcing plate 43 is included.

  However, the load carrier 61 according to the third embodiment is provided with two reinforcing plates, that is, a reinforcing plate 43 and a reinforcing plate 62 to be described later, in a range between the left and right hinge brackets 39 and 40, and each hinge. It differs from the loading platform 21 according to the first embodiment in that four reinforcing plates 64 to 67 described later are provided in the range from the front end portions 39A, 40A of the brackets 39, 40 to the front plate 25. .

  The reinforcing plate 62 is provided on the rear side of the reinforcing plate 43 and reinforces the periphery of the left and right hinge brackets 39 and 40 together with the reinforcing plate 43. The reinforcing plate 62 is formed as a rectangular plate using a steel plate material, and is positioned between the left and right vertical frames 27 and 28 and between the intermediate horizontal frames 34C and 35C adjacent in the front and rear directions. doing. The intermediate horizontal frame 34C and the intermediate horizontal frame 35C are disposed between the left and right hinge brackets 39 and 40, and the reinforcing plate 62 is provided in a range sandwiched between the hinge brackets 39 and 40.

  The left end of the reinforcing plate 62 is joined to the left vertical frame 27, and the right end of the reinforcing plate 62 is joined to the right vertical frame 28. The front end of the reinforcing plate 62 is joined to the connecting portion 34C3 of the intermediate horizontal frame 34C, and the rear end of the reinforcing plate 62 is joined to the connecting portion 35C3 of the intermediate horizontal frame 35C. In this case, the reinforcing plate 62 forms substantially the same plane as the connecting portion 34C3 of the intermediate horizontal frame 34C and the connecting portion 35C3 of the intermediate horizontal frame 35C.

  In this manner, the reinforcing plate 62 is joined to the left and right vertical frames 27 and 28 and the front and rear intermediate horizontal frames 34C and 35C via the weld beads 62A. Thus, the box structure 44 formed between the intermediate horizontal frames 33C and 34C is surrounded by the front and rear intermediate horizontal frames 34C and 35C, the bottom plate 22 and the reinforcing plate 62 on the rear side. A body 63 can be formed.

  The reinforcing plate 64 is a rectangular flat plate and is disposed on the front side of the reinforcing plate 43. The reinforcing plate 64 is positioned between the left and right vertical frames 27 and 28, and is positioned between the intermediate horizontal frames 32C and 33C adjacent in the front and rear directions. The left end of the reinforcing plate 64 is joined to the left vertical frame 27, and the right end of the reinforcing plate 64 is joined to the right vertical frame 28. The front end of the reinforcing plate 64 is joined to the connecting portion 32C3 of the intermediate horizontal frame 32C, and the rear end of the reinforcing plate 64 is joined to the connecting portion 33C3 of the intermediate horizontal frame 33C.

  In this manner, the reinforcing plate 64 is joined to the left and right vertical frames 27 and 28 and the front and rear intermediate horizontal frames 32C and 33C via the weld beads 64A. Further, the reinforcing plate 64 forms substantially the same plane as the connecting portion 32C3 of the intermediate horizontal frame 32C and the connecting portion 33C3 of the intermediate horizontal frame 33C.

  The reinforcing plate 65 is a flat plate having a quadrangular shape, and is disposed on the front side of the reinforcing plate 64. The reinforcing plate 65 is positioned between the left and right vertical frames 27 and 28, and is positioned between the intermediate horizontal frames 31C and 32C adjacent in the front and rear directions. The left end of the reinforcing plate 65 is joined to the left vertical frame 27, and the right end of the reinforcing plate 65 is joined to the right vertical frame 28. The front end of the reinforcing plate 65 is joined to the connecting portion 31C3 of the intermediate horizontal frame 31C, and the rear end of the reinforcing plate 65 is joined to the connecting portion 32C3 of the intermediate horizontal frame 32C.

  In this manner, the reinforcing plate 65 is joined to the left and right vertical frames 27 and 28 and the front and rear intermediate horizontal frames 31C and 32C via the weld beads 65A. Furthermore, the reinforcing plate 65 forms substantially the same plane as the connecting portion 31C3 of the intermediate horizontal frame 31C and the connecting portion 32C3 of the intermediate horizontal frame 32C.

  The reinforcing plate 66 is a flat plate having a quadrangular shape (trapezoidal shape), and is disposed on the front side of the reinforcing plate 65. The reinforcing plate 66 is positioned between the left and right vertical frames 27 and 28, and is positioned between the adjacent intermediate horizontal frames 30C and 31C in the front and rear directions. The left end of the reinforcing plate 66 is joined to the left vertical frame 27, and the right end of the reinforcing plate 66 is joined to the right vertical frame 28. The front end of the reinforcing plate 66 is joined to the connecting portion 30C3 of the intermediate horizontal frame 30C, and the rear end of the reinforcing plate 66 is joined to the connecting portion 31C3 of the intermediate horizontal frame 31C.

  In this way, the reinforcing plate 66 is joined to the left and right vertical frames 27 and 28 and the front and rear intermediate horizontal frames 30C and 31C via the weld beads 66A. Further, the reinforcing plate 66 forms substantially the same plane as the connecting portion 30C3 of the intermediate horizontal frame 30C and the connecting portion 31C3 of the intermediate horizontal frame 31C.

  The reinforcing plate 67 is a rectangular plate (trapezoidal) and is disposed on the front side of the reinforcing plate 66. The reinforcing plate 67 is positioned between the left and right vertical frames 27 and 28, and is positioned between the intermediate horizontal frames 29C and 30C adjacent in the front and rear directions. The left end of the reinforcing plate 67 is joined to the left vertical frame 27, and the right end of the reinforcing plate 67 is joined to the right vertical frame 28. The front end of the reinforcing plate 67 is joined to the connecting portion 29C3 of the intermediate horizontal frame 29C, and the rear end of the reinforcing plate 67 is joined to the connecting portion 30C3 of the intermediate horizontal frame 30C.

  In this way, the reinforcing plate 67 is joined to the left and right vertical frames 27 and 28 and the front and rear intermediate horizontal frames 29C and 30C via the weld beads 67A. Further, the reinforcing plate 67 forms substantially the same plane as the connecting portion 29C3 of the intermediate horizontal frame 29C and the connecting portion 30C3 of the intermediate horizontal frame 30C.

  In this way, on the front side of the box structure 44 formed between the intermediate horizontal frames 33C and 34C, a box structure 68 surrounded by the intermediate horizontal frames 32C and 33C, the bottom plate 22, and the reinforcing plate 64 is provided. Can be formed. A box structure 69 surrounded by the intermediate horizontal frames 31 </ b> C and 32 </ b> C, the bottom plate 22, and the reinforcing plate 65 can be formed on the front side of the box structure 68. A box structure 70 surrounded by the intermediate horizontal frames 30C and 31C, the bottom plate 22, and the reinforcing plate 66 can be formed on the front side of the box structure 69. A box structure 71 surrounded by the intermediate horizontal frames 29C and 30C, the bottom plate 22, and the reinforcing plate 67 can be formed on the front side of the box structure 70.

  The dump truck 1 according to the third embodiment has the loading platform 61 as described above, and the basic operation thereof is not particularly different from the loading platform 21 according to the first embodiment.

  However, in the range between the left and right hinge brackets 39 and 40, the loading platform 61 according to the third embodiment is provided with the reinforcing plate 43 between the intermediate lateral frames 33C and 34C adjacent in the front and rear directions. The reinforcing plate 62 is provided between the intermediate horizontal frames 34C and 35C adjacent in the front and rear directions.

  Thereby, the loading platform 61 includes intermediate horizontal frames 33C, 34C, and 35C, a box structure 44 formed between the intermediate horizontal frames 33C and 34C, and a box structure 63 formed between the intermediate horizontal frames 34C and 35C. Thus, the left and right vertical frames 27 and 28 can be firmly connected to each other. As a result, it is possible to suppress the left and right vertical frames 27 and 28 from being deformed in the peripheral portions of the left and right hinge brackets 39 and 40 to which a large load is applied from the loading platform 61.

  On the other hand, in the range from the front end portions 39A, 40A of the hinge brackets 39, 40 to the front plate 25, a reinforcing plate 64 is provided between the intermediate horizontal frames 32C, 33C adjacent in the front and rear directions, and is adjacent in the front and rear directions. A reinforcing plate 65 is provided between the matching intermediate horizontal frames 31C and 32C, a reinforcing plate 66 is provided between the adjacent intermediate horizontal frames 30C and 31C in the front and rear directions, and between the intermediate horizontal frames 29C and 30C adjacent in the front and rear directions. The reinforcing plate 67 is provided in the structure.

  Thereby, the loading platform 61 includes the intermediate horizontal frames 33C, 32C, 31C, 30C, and 29C, the box structure 68 formed between the intermediate horizontal frames 32C and 33C, and the box formed between the intermediate horizontal frames 31C and 32C. Via the structure 69, the box structure 70 formed between the intermediate horizontal frames 30C and 31C, and the box structure 71 formed between the intermediate horizontal frames 29C and 30C, the left and right vertical frames 27, The 28 can be firmly connected. As a result, deformation of the left and right vertical frames 27 and 28 can also be suppressed in the peripheral portions of the pads 42A to 42E to which the load from the loading platform 61 acts.

  Next, FIGS. 12 and 13 show a fourth embodiment of the present invention. The feature of the fourth embodiment is that a reinforcing member is provided in the range from the front end of each hinge bracket to the front plate of the loading platform. That is. In the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  The loading platform 81 used in the fourth embodiment is similar to the loading platform 21 according to the first embodiment. The bottom plate 22, the left and right side plates 23 and 24, the front plate 25, the roof plate 26, Left and right vertical frames 27 and 28, a plurality of horizontal frames 29 to 36, left and right cylinder brackets 37 and 38, a plurality of pads 42A to 42E, and left and right hinge brackets 39 and 40 It is configured to include.

  However, the loading platform 81 according to the fourth embodiment is provided with four reinforcing plates 82 to 85 described later in the range from the front end portions 39A and 40A of the hinge brackets 39 and 40 to the front plate 25, respectively. This is different from the loading platform 21 according to the first embodiment.

  The reinforcing plate 82 is formed of a rectangular flat plate, and is positioned between the left and right vertical frames 27 and 28 and is positioned between the intermediate horizontal frames 32C and 33C adjacent in the front and rear directions. The left and right edge portions of the reinforcing plate 82 are joined to the left and right vertical frames 27 and 28 via weld beads 82A, and the front and rear edge portions of the reinforcing plate 82 are connected via weld beads 82A. Are joined to the connecting portions 32C3 and 33C3 of the intermediate horizontal frames 32C and 33C. The reinforcing plate 82 forms substantially the same plane as the connecting portion 32C3 of the intermediate horizontal frame 32C and the connecting portion 33C3 of the intermediate horizontal frame 33C.

  The reinforcing plate 83 is a rectangular flat plate and is disposed on the front side of the reinforcing plate 82. The reinforcing plate 83 is positioned between the left and right vertical frames 27 and 28, and is positioned between the intermediate horizontal frames 31C and 32C adjacent in the front and rear directions. The left and right edge portions of the reinforcing plate 83 are joined to the left and right vertical frames 27 and 28 via the weld beads 83A, and the front and rear edge portions of the reinforcing plate 83 are connected via the weld beads 83A. Are joined to the connecting portions 31C3 and 32C3 of the intermediate horizontal frames 31C and 32C. The reinforcing plate 83 forms substantially the same plane as the connecting portion 31C3 of the intermediate horizontal frame 31C and the connecting portion 32C3 of the intermediate horizontal frame 32C.

  The reinforcing plate 84 is a flat plate having a quadrangular shape (trapezoidal shape), and is disposed on the front side of the reinforcing plate 83. The reinforcing plate 84 is positioned between the left and right vertical frames 27 and 28, and is positioned between the intermediate horizontal frames 30C and 31C adjacent in the front and rear directions. The left and right edge portions of the reinforcing plate 84 are joined to the left and right vertical frames 27 and 28 via the weld beads 84A, and the front and rear edge portions of the reinforcing plate 84 are connected via the weld beads 84A. Are joined to the connecting portions 30C3 and 31C3 of the intermediate horizontal frames 30C and 31C. The reinforcing plate 84 forms substantially the same plane as the connecting portion 30C3 of the intermediate horizontal frame 30C and the connecting portion 31C3 of the intermediate horizontal frame 31C.

  The reinforcing plate 85 is a flat plate having a quadrangular shape (trapezoidal shape), and is disposed on the front side of the reinforcing plate 84. The reinforcing plate 85 is positioned between the left and right vertical frames 27 and 28, and is positioned between the intermediate horizontal frames 29C and 30C adjacent in the front and rear directions. The left and right edge portions of the reinforcing plate 85 are joined to the left and right vertical frames 27 and 28 via weld beads 85A, and the front and rear edge portions of the reinforcing plate 85 are connected via weld beads 85A. Are joined to the connecting portions 29C3 and 30C3 of the intermediate horizontal frames 29C and 30C. The reinforcing plate 85 forms substantially the same plane as the connecting portion 29C3 of the intermediate horizontal frame 29C and the connecting portion 30C3 of the intermediate horizontal frame 30C.

  In this manner, a box structure 86 surrounded by the intermediate horizontal frames 32C and 33C, the bottom plate 22, and the reinforcing plate 82 can be formed between the left and right vertical frames 27 and 28. On the front side of the box structure 86, a box structure 87 surrounded by the intermediate horizontal frames 31C and 32C, the bottom plate 22, and the reinforcing plate 83 can be formed. A box structure 88 surrounded by the intermediate horizontal frames 30C and 31C, the bottom plate 22, and the reinforcing plate 84 can be formed on the front side of the box structure 87. A box structure 89 surrounded by the intermediate horizontal frames 29C and 30C, the bottom plate 22, and the reinforcing plate 85 can be formed on the front side of the box structure 88.

  The dump truck 1 according to the fourth embodiment has the loading platform 81 as described above, and the basic action thereof is not different from that of the loading platform 21 according to the first embodiment.

  However, the loading platform 81 according to the fourth embodiment has a reinforcing plate 82 between the front and rear intermediate horizontal frames 32C and 33C in the range from the front end portions 39A and 40A of the hinge brackets 39 and 40 to the front plate 25. The reinforcing plate 83 is provided between the front and rear intermediate horizontal frames 31C and 32C, the reinforcing plate 84 is provided between the front and rear intermediate horizontal frames 30C and 31C, and between the front and rear intermediate horizontal frames 29C and 30C. The reinforcing plate 85 is provided.

  Thereby, the loading platform 81 includes the intermediate horizontal frames 33C, 32C, 31C, 30C, and 29C, the box structure 86 formed between the intermediate horizontal frames 32C and 33C, and the box formed between the intermediate horizontal frames 31C and 32C. Via the structure 87, the box structure 88 formed between the intermediate horizontal frames 30C and 31C, and the box structure 89 formed between the intermediate horizontal frames 29C and 30C, the left and right vertical frames 27, The 28 can be firmly connected. As a result, the left and right vertical frames 27 and 28 can be prevented from being deformed in the peripheral portions of the pads 42A to 42E to which the load from the loading platform 81 acts.

  In the first embodiment described above, a flat reinforcing plate is located between the left and right vertical frames 27 and 28 and between the intermediate horizontal frames 33C and 34C adjacent in the front and rear directions. 43, the reinforcing plate 43 is joined to the left and right vertical frames 27 and 28 and the intermediate horizontal frames 33C and 34C. However, the present invention is not limited to this, and a reinforcing plate 43 'having a through-hole 43B penetrating upward and downward in the center is provided, for example, like a loading platform 21' of the modification shown in FIG. It is good also as a structure.

  In this case, the weight of the reinforcing plate 43 ′ itself can be reduced by providing the through hole 43 </ b> B. As a result, even when the reinforcing plate 43 ′ is provided, it is possible to suppress a large increase in the weight of the entire loading platform 21 ′, and it is possible to sufficiently secure the load amount of the transported goods. The same applies to the reinforcing plate 52 used in the second embodiment, the reinforcing plates 62 and 64 to 67 used in the third embodiment, and the reinforcing plates 82 to 85 used in the fourth embodiment.

  In the first embodiment described above, the intermediate horizontal frame 33C of the horizontal frame 33 is integrally formed using a steel material having a U-shaped cross section, and the front fixing portion 33C1, the rear fixing portion 33C2, and the connecting portion 33C3 are formed. The case where it comprises by is illustrated. However, the present invention is not limited to this. For example, the front fixing portion, the rear fixing portion, and the connecting portion formed by separate members are joined using means such as welding to form an intermediate horizontal frame having a U-shaped cross section. May be. The same applies to the other intermediate horizontal frames 29C, 30C, 31C, 32C, 34C, 35C, and 36C.

DESCRIPTION OF SYMBOLS 1 Dump truck 2 Car body 21,51,61,81,21 'Loading platform 22 Bottom plate 22D Lower surface 23 Left side plate 24 Right side plate 25 Front plate 27 Left vertical frame 28 Right vertical frame 29, 30, 31, 32, 33, 34, 35 , 36 Horizontal frame 29A, 30A, 31A, 32A, 33A, 34A, 35A, 36A Left lateral frame 29B, 30B, 31B, 32B, 33B, 34B, 35B, 36B Right lateral frame 29C, 30C, 31C, 32C, 33C, 34C, 35C, 36C Intermediate horizontal frame 29C1, 30C1, 31C1, 32C1, 33C1, 34C1, 35C1 Front fixing part 29C2, 30C2, 31C2, 32C2, 33C2, 34C2, 35C2 Rear fixing part 29C3, 30C3, 31C3, 32C3, 33C3 34C3, 35C3 connecting part 39 Left hinge bracket 40 Right hinge bracket 41 Hinge pin 43, 52, 62, 64, 65, 66, 67, 82, 83, 84, 85, 43 'Reinforcing plate (reinforcing member)
43B Through hole

Claims (5)

A self-propelled vehicle body having a front wheel and a rear wheel, and a loading platform that is tiltably provided on the vehicle body with the rear position of the vehicle body as a fulcrum, and loads a load,
The loading platform includes a bottom plate made of a flat plate, left and right side plates extending upward from both left and right sides of the bottom plate, and front ends of the left and right side plates extending upward from a front end of the bottom plate. A front plate that closes the bottom plate, left and right on the bottom surface of the bottom plate with a left and right front, and a left and right vertical frame extending in the rear direction, and a bottom surface on the bottom plate with a front and a back side with a spacing in the left, A plurality of horizontal frames extending in the right direction and left and right hinges provided on the left and right vertical frames and connected to a rear position of the vehicle body via a hinge pin serving as a fulcrum so as to be tiltable. With brackets,
The horizontal frame includes a left horizontal frame positioned between the left side plate and the left vertical frame, a right horizontal frame positioned between the right side plate and the right vertical frame, and the left and right vertical frames. In a dump truck composed of an intermediate horizontal frame located between,
Provided on the lower surface side of the bottom plate is a reinforcing member located between the left and right vertical frames and located between the front and rear intermediate horizontal frames adjacent to each other in the front and rear directions among the intermediate horizontal frames, The dump truck according to claim 1, wherein the reinforcing member is configured to be joined to the left and right vertical frames and the adjacent front and rear intermediate horizontal frames. Each of the intermediate horizontal frames is connected between the front and rear fixed portions and the front and rear fixed portions that are fixed so as to hang downward from the bottom surface of the bottom plate while facing each other in the front and rear directions. The bottom plate and the connecting portion facing upward and downward,
The reinforcing member is constituted by a flat reinforcing plate that connects between the adjacent front and rear intermediate horizontal frames,
2. The dump truck according to claim 1, wherein the reinforcing plate is arranged on substantially the same plane as the connecting portions of the adjacent front and rear intermediate horizontal frames. The left and right hinge brackets are arranged to extend forward and rearward on the lower surface side of the bottom plate,
The dump truck according to claim 1 or 2, wherein the reinforcing member is provided in a range at least sandwiched between the left and right hinge brackets. The left and right hinge brackets are arranged to extend forward and rearward on the lower surface side of the bottom plate,
The dump truck according to claim 1, wherein the reinforcing member is provided in a range from a front end of the left and right hinge brackets to the front plate.   5. The dump truck according to claim 1, 2, 3, or 4, wherein the reinforcing member is provided with a through-hole penetrating upward and downward in order to reduce the weight of the reinforcing member.

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