Automated Cargo Vehicle

Abstract

To provide a motortruck which enables complication of structure thereof to be suppressed.SOLUTION: A motortruck 100 is provided, comprising: a cargo bed 102 which changes the attitude thereof with respect to a chassis frame 200 into the storage attitude being the attitude assumed when the cargo bed 102 is arranged on the chassis frame 200 and the grounding attitude being the attitude assumed when the cargo bed 102 is arranged on the ground surface G; and a cargo bed ascending / descending device (guide roller guiding portion 104, guide roller 403) which causes a part of the cargo bed 102 to come in contact with the ground surface G before the entire gravity center CG1 of the motortruck 100 moves to the rear side relative to a rear wheel shaft CG2 of the motortruck 100 when viewed from the width direction of the motortruck 100 when the attitude of the cargo bed 102 is changed to the grounding attitude from the storage attitude.SELECTED DRAWING: Figure 13

Description

Technical Field

[0001] The present invention relates to a freight vehicle capable of changing the posture of a loading platform between a storage posture in which the loading platform is disposed on a chassis frame and a grounding posture in which the loading platform is disposed on the ground.

Background Art

[0002] A freight vehicle capable of grounding a loading platform slid rearward is provided with support legs for supporting the loading platform in order to prevent, for example, as disclosed in Patent Document 1, the loading platform that slides rearward from being supported in a cantilever state at the rear of the vehicle.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the configuration disclosed in Patent Document 1, when returning the grounded loading platform to the posture during the running of the freight vehicle, it is necessary to fold the support legs, so the structure of the support legs needs to be a foldable structure, which causes a problem that the structure becomes complicated. In view of the above problems, an object of the present invention is to provide a freight vehicle capable of suppressing the complication of the structure.

Means for Solving the Problems

[0005] A cargo vehicle according to one aspect of the present invention comprises a cargo bed and a cargo bed lifting device. The cargo bed is capable of changing its orientation relative to the chassis frame between a stowed position, in which it is positioned on the chassis frame, and a ground-level position, in which it is positioned on the ground. The cargo bed lifting device is a device that, when the orientation of the cargo bed changes from the stowed position to the ground-level position, touches a part of the cargo bed to the ground before the overall center of gravity of the cargo vehicle moves behind the rear axle of the cargo vehicle, as viewed from the width direction of the cargo vehicle. [Effects of the Invention]

[0006] According to the present invention, it is possible to suppress structural complexity in the cargo vehicle. [Brief explanation of the drawing]

[0007] [Figure 1] This is a side view showing the configuration of a cargo truck equipped with a rear tailgate, with the cargo bed in the retracted position. [Figure 2] This is a side view of the vehicle body with the cargo bed in the retracted position. [Figure 3] This is an exploded view of the vehicle body. [Figure 4] This is a view along line IV in Figure 2. [Figure 5] Figure 2 is a cross-sectional view along the VV line. [Figure 6] This is a cross-sectional view taken along the line VI-VI in Figure 2. [Figure 7] This is a cross-sectional view taken along line VII-VII in Figure 2. [Figure 8] This is a cross-sectional view taken along line VIII-VIII in Figure 2. [Figure 9] This is a diagram illustrating the operation of a cargo truck. [Figure 10] This is a diagram illustrating the operation of a cargo truck. [Figure 11] This is a diagram illustrating the operation of a cargo truck. [Figure 12] This is a cross-sectional view taken along line XII-XII in Figure 11. [Figure 13] This is a diagram illustrating the operation of a cargo truck. [Figure 14] It is a sectional view taken along line XIV-XIV of FIG. 13. [Figure 15] It is a diagram showing the operation of a truck. [Figure 16] It is a diagram showing the operation of a truck. [Figure 17] It is a diagram showing the operation of a truck. [Figure 18] It is a diagram showing the operation of a truck. [Figure 19] It is a diagram showing the operation of a truck.

Mode for Carrying Out the Invention

[0008] Hereinafter, the afterburner device according to the present invention will be described with appropriate reference to the drawings. Note that the drawings are schematic. Therefore, it should be noted that the relationship between the thickness and the planar dimensions, the ratio, etc. may be different from the actual ones, and there may be portions where the dimensional relationships and ratios are different between the drawings. Also, the following embodiments illustrate devices and methods for embodying the technical idea of the present invention, and the technical idea of the present invention does not specify the material, shape, structure, arrangement, etc. of the components in the following embodiments.

[0009] (Embodiment) (Configuration) As shown in FIG. 1, the truck 100 includes an afterburner device 1. The description of the afterburner device 1 will be given later. The truck 100 also includes a vehicle body 101. In the embodiment, as shown in FIG. 1, the case where the vehicle body 101 is a truck will be described. In the following description and drawings, the direction in which the truck 100 moves forward (the direction in which it travels when the shift is selected to the D range or the like) may be described as "forward". Similarly, in the following description and drawings, the direction in which the truck 100 moves backward (the direction in which it travels when the shift is selected to the R range) may be described as "backward".

[0010] In the following description and drawings, the left side when the driver of the truck 100 is sitting in the driver's seat is referred to as the "left side", and the right side when the driver is sitting in the driver's seat is referred to as the "right side". Therefore, in the following description and drawings, the perspective of viewing the truck 100 from the left side is referred to as the "left side view", and the perspective of viewing the truck 100 from the right side is referred to as the "right side view". Also, in the following description, the "left side view" and the "right side view" may be collectively referred to as the "side view". As shown in FIGS. 1 to 3, the vehicle body 101 includes a chassis frame 200, a loading platform 102, an inclined frame 300, a guide frame 400, a loading platform cylinder 500, an inclined frame cylinder 600, and a bumper stay 700. The chassis frame 200 constitutes the skeleton of the vehicle body 101.

[0011] <Loading platform> The loading platform 102 is disposed on the inclined frame 300 in the storage posture shown in FIG. 1. The loading platform 102 further includes a floor board 106, a front roller 102a, a rear roller 102b, and a longitudinal joist 103. The floor board 106 is a board on which goods such as the vehicle to be transported are loaded on the upper surface.

[0012] The front roller 102a is formed in a cylindrical shape and is disposed on the lower surface (the lower side surface in FIG. 2) of the floor board 106. The front roller 102a is rotatably attached to the floor board 106 using a front bracket 102c. A part of the front roller 102a protrudes downward from the front bracket 102c. The rotation axis of the front roller 102a is oriented parallel to the width direction of the truck 100. The rear roller 102b is formed in a cylindrical shape and is disposed on the lower surface of the floor board 106 at the rear end (the right end in FIG. 2) of the floor board 106. The rear roller 102b is rotatably attached to the floor board 106. A part of the rear roller 102b protrudes downward and rearward from the floor board 106. The rotation axis of the rear roller 102b is oriented parallel to the width direction of the truck 100.

[0013] The vertical joists 103 are formed in pairs and are fixed to the underside of the floorboards 106. Furthermore, as shown in Figure 5, the longitudinal joist 103 is formed in a U-shape with an opening that faces outward in the width direction of the cargo truck 100 when viewed from the front-rear direction of the cargo truck 100. The longitudinal direction of the vertical joist 103 is parallel to the front-to-back direction of the cargo truck 100. Furthermore, the portion of the underside of the floor plate 106 that is positioned between the front bracket 102c and the longitudinal joist 103 when viewed from the front-rear direction of the cargo truck 100 forms a guide roller guide portion 104.

[0014] The guide roller guide section 104 includes a front horizontal guide surface 104a, an inclined guide surface 104b, and a rear horizontal guide surface 104c. The front horizontal guide surface 104a forms the front portion (left side in Figure 2) of the guide roller guide section 104 when viewed from the width direction of the cargo truck 100, and is a surface parallel to the lower surface of the floor plate 106. The inclined guide surface 104b forms the portion of the guide roller guide section 104 that is rearward (to the right in Figure 2) of the front horizontal guide surface 104a when viewed from the width direction of the cargo truck 100. Furthermore, the inclined guide surface 104b is a surface that is inclined so that the rear is lower than the front when viewed from the width direction of the cargo truck 100.

[0015] The degree of inclination (angle of inclination) of the inclined guide surface 104b is set such that, for example, when a load (vehicle to be transported, etc.) with the maximum load capacity set for the cargo truck 100 (for example, 3.5 tons) is placed on the rearmost part of the cargo bed 102, and the posture of the cargo bed 102 changes from a stowed posture to a ground-on posture, a part of the cargo bed 102 touches the ground G before the overall center of gravity CG1 of the cargo truck 100 moves behind the rear axle CG2 of the cargo truck 100, as viewed from the width direction of the cargo truck 100. The rear axle CG2 refers to the axle that rotates the rear wheels of the cargo truck 100. The rear horizontal guide surface 104c forms the portion of the guide roller guide section 104 that is located behind (to the right in Figure 2) the inclined guide surface 104b when viewed from the width direction of the cargo truck 100, and is a surface parallel to the lower surface of the floor plate 106.

[0016] <Sloping frame> The inclined frame 300 is positioned between the guide frame 400 and the loading platform 102, and is formed to be displaceable relative to the guide frame 400 and the loading platform 102. Specifically, the inclined frame 300 is mounted to the guide frame 400 so that it can be tilted and slid. Furthermore, the inclined frame 300 includes a first horizontal section 301, an inclined section 302, a second horizontal section 303, a first lower roller 304, and a second lower roller 305.

[0017] The first horizontal section 301 is formed using two plate-shaped members, each shaped like a U when viewed from the front-rear direction of the cargo truck 100. When the cargo bed 102 is in the stowed position, its length is positioned parallel to the front-rear direction of the cargo truck 100. The pair of first horizontal sections 301 are arranged parallel to each other along the width direction of the cargo truck 100, and their thickness direction is parallel to the width direction of the cargo truck 100. Furthermore, as shown in Figure 5, each of the two first horizontal sections 301 is provided with a first guide lane 301a on which the front roller 102a travels. The first guide lanes 301a are formed on the surfaces of the two first horizontal sections 301 that face outward in the width direction of the cargo truck 100.

[0018] The inclined section 302 is continuous with the rear end of the first horizontal section 301 (the right end in Figure 2). The inclined section 302 is formed using a pair of plate-shaped members, and when the cargo bed 102 is in the stowed position, it is inclined upward the further it is from the first horizontal section 301 when viewed from the side. The pair of inclined sections 302 are arranged parallel to each other along the width direction of the cargo truck 100, and their thickness direction is parallel to the width direction of the cargo truck 100. Furthermore, each pair of inclined sections 302 is equipped with an inclined section guide lane 302a on which the front roller 102a travels. The inclined section guide lane 302a is formed on the surface of each pair of inclined sections 302 that faces outward in the width direction of the cargo truck 100. In addition, the inclined section guide lane 302a is continuous with the first guide lane 301a.

[0019] The second horizontal section 303 is continuous with the rear end of the inclined section 302 (the right end in Figure 2). The inclined section 302 is formed using two plate-shaped members as a pair, and is positioned with its length parallel to the front-to-rear direction of the cargo truck 100 when the cargo bed 102 is in the stowed position. The pair of second horizontal sections 303 are arranged parallel to the width direction of the cargo truck 100, and their thickness direction is parallel to the width direction of the cargo truck 100. Furthermore, as shown in Figure 6, each of the two pairs of second horizontal sections 303 is equipped with a second guide lane 303a on which the front roller 102a travels. The second guide lanes 303a are formed on the surfaces of the two pairs of second horizontal sections 303 that face outward in the width direction of the cargo truck 100. The second guide lanes 303a are also continuous with the inclined section guide lane 302a.

[0020] The first lower roller 304 is formed in a cylindrical shape and is positioned on the lower surface (the lower side in Figure 2) of the second horizontal section 303. The first lower roller 304 is rotatably mounted to the second horizontal section 303 using the first lower bracket 306. A portion of the first lower roller 304 protrudes downward from the first lower bracket 306. The axis of rotation of the first lower roller 304 is oriented parallel to the width direction of the cargo truck 100. The second lower roller 305 is cylindrical in shape and is positioned on the lower surface (the lower surface in Figure 2) of the second horizontal section 303, at a position further away from the first horizontal section 301 than the first lower roller 304. The second lower roller 305 is rotatably mounted to the second horizontal section 303 using the second lower bracket 307. A portion of the second lower roller 305 protrudes downward from the second lower bracket 307. The axis of rotation of the second lower roller 305 is oriented parallel to the width direction of the cargo truck 100.

[0021] <Guide frame> The guide frame 400 is fixed to the chassis frame 200 and is positioned between the chassis frame 200 and the cargo bed 102. The guide frame 400 also includes a horizontal guide section 401, an inclined guide section 402, a guide roller 403, a retaining hook 404, and a sliding member 405. The horizontal guide section 401 is formed using a pair of plate-shaped members, each shaped like a U when viewed from the front-rear direction of the cargo truck 100, and is positioned with its length parallel to the front-rear direction of the cargo truck 100.

[0022] The pair of horizontal guide sections 401 are arranged parallel to each other along the width direction of the cargo truck 100, and their thickness direction is parallel to the width direction of the cargo truck 100. Furthermore, as shown in Figure 6, each pair of horizontal guide sections 401 includes a horizontal guide lane 401a on which the first lower roller 304 and the second lower roller 305 run. The horizontal guide lane 401a is formed on the surfaces of the pair of horizontal guide sections 401 facing each other.

[0023] The inclined guide section 402 is continuous with the rear end (the right end in Figure 2) of the horizontal guide section 401. The inclined guide section 402 is formed using a pair of plate-shaped members, and in a side view, it is inclined downwards as it moves away from the horizontal guide section 401. The pair of inclined guide sections 402 are arranged parallel to each other along the width direction of the cargo truck 100, and their thickness direction is parallel to the width direction of the cargo truck 100. Furthermore, each pair of inclined guide sections 402 is equipped with an inclined guide lane 402a on which the first lower roller 304 and the second lower roller 305 run. The inclined guide lane 402a is formed on the surfaces of the pair of inclined guide sections 402 facing each other. The inclined guide lane 402a is also continuous with the horizontal guide lane 401a.

[0024] The guide roller 403 is cylindrical in shape and is positioned at the rear end of the horizontal guide section 401, and is rotatably mounted relative to the horizontal guide section 401. A portion of the guide roller 403 protrudes above the horizontal guide section 401. The axis of rotation of the guide roller 403 is oriented parallel to the width direction of the cargo truck 100. Furthermore, the guide roller 403 rotates while in contact with the guide roller guide portion 104 when the loading platform 102 and the guide frame 400 are displaced relative to each other. The inclined guide surface 104b is the surface of the guide roller guide section 104 that contacts the guide roller 403 from above when the posture of the loading platform 102 changes between a stowed position and a position in which only a part of the loading platform 102 is in contact with the ground G.

[0025] The retaining hook 404 is positioned at the front end of the horizontal guide section 401 (the left end in Figure 2) and protrudes upward from the horizontal guide section 401. Furthermore, the retaining hook 404 is shaped to be able to grasp a portion of the cargo bed 102. The sliding member 405 is formed in a plate shape, for example, using a copper alloy. Furthermore, the sliding member 405 is positioned at the rear end (the right end in Figure 2) of the horizontal guide section 401 with its thickness direction parallel to the width direction of the truck 100. In addition, the sliding member 405 is attached to the surfaces of the pair of horizontal guide sections 401 that face outward in the width direction of the truck 100.

[0026] <Cargo bed cylinder> The cargo bed cylinder 500 is formed by an actuator, a cylinder, etc., and is a device that changes the posture of the cargo bed 102 between the stowed posture and the grounded posture shown in Figure 1. The ground-contacting position is one in which the cargo bed 102 is positioned on the ground G behind the cargo vehicle 100. When changing the orientation of the cargo bed 102 from the stowed position to the grounded position, the cargo bed cylinder 500 is activated to move the cargo bed 102 along the inclined frame 300.

[0027] <Inclined frame cylinder> The tilt frame cylinder 600 is formed by an actuator, a cylinder, etc., and is a device that changes the posture of the cargo bed 102 between a stowed posture and a grounded posture. When changing the position of the cargo bed 102 from the stowed position to the grounded position, the inclined frame cylinder 600 is activated to move the cargo bed 102 and the inclined frame 300 along the guide frame 400. As described above, the cargo bed 102 can change its orientation relative to the chassis frame 200 between a stowed position and a grounded position.

[0028] <Banpaste> The Bumper Station 700 consists of a first Bumper Station 710 and a second Bumper Station 720. The first bumper stay 710 is formed using two rectangular tubular members as a pair, and when the cargo bed 102 is in the stowed position, its length is positioned parallel to the front-to-rear direction of the cargo vehicle 100. The front end of the first bumper stay 710 (the left end in Figure 2) is rotatably connected to the guide frame 400 (inclined guide section 402). The axis of rotation of the first bumper stay 710 is oriented parallel to the width direction of the cargo truck 100. The rear bumper 730 is fixed to the rear end of the first bumper stay 710 (the right end in Figure 2). The rear bumper 730 is a component that is positioned in the location required by regulations for cargo vehicles 100 (rearward from the guide frame 400).

[0029] The second bumper stay 720 is formed using two rectangular tubular members as a pair, and when the cargo bed 102 is in the stowed position, its length is positioned parallel to the vertical direction. The lower end of the second bumper stay 720 (the lower end in Figure 2) is rotatably attached to the rear end of the first bumper stay 710. The axis of rotation of the second bumper stay 720 is oriented parallel to the width direction of the cargo truck 100. A pair of bumper rollers 740 are attached to the upper end (the upper end in Figure 2) of the second bumper stay 720.

[0030] A pair of bumper rollers 740 are positioned opposite each other across the width of the cargo truck 100. The bumper roller 740 is formed in a cylindrical shape. A portion of the bumper roller 740 protrudes above the second bumper stay 720 and contacts the lower bumper guide surface 103b from above. The rotation axis of the bumper roller 740 is oriented parallel to the width direction of the cargo truck 100. Furthermore, the pair of bumper rollers 740 are in rotatable contact with the upper bumper guide surface 103a and the lower bumper guide surface 103b of the longitudinal joist 103, as shown in Figure 8. In addition, the end faces of the pair of bumper rollers 740 are in contact with the lateral bumper guide surface 103c of the longitudinal joist 103, as shown in Figure 8.

[0031] The upper bumper guide surface 103a is the surface of the longitudinal joist 103 that forms a U-shape when viewed from the front-rear direction of the cargo vehicle 100, and is positioned above the bumper roller 740. The lower bumper guide surface 103b is the surface of the longitudinal joist 103 that forms a U-shape when viewed from the front-rear direction of the cargo vehicle 100, and is located below the bumper roller 740. The lateral bumper guide surface 103c is the surface of the longitudinal joist 103 that forms a U-shape when viewed from the front-rear direction of the cargo vehicle 100, and is positioned to the side of the bumper roller 740. Therefore, the pair of bumper rollers 740 are positioned above the bumper stays 720 and are rotatable while in contact with the cargo bed 102.

[0032] (Rear-end tailgating device) The rear tailgate device 1 includes a rear tailgate 2, as shown in Figure 1, etc. <Post-taunting> The rear tailgate 2 is located at the rear of the cargo bed 102 and is a plate that also serves as a ramp when loading cargo onto the cargo bed 102. The rear tailgate 2 is attached to the rear end of the cargo bed 102 in a manner that allows it to be rotated relative to the cargo bed 102. Furthermore, by rotating the rear tailgate 2 relative to the cargo bed 102, its position relative to the cargo bed 102 can be changed between a closed position and an open position.

[0033] The closed position is an upright position, specifically, as shown in Figure 1, a position perpendicular to the direction in which the cargo truck 100 is traveling, and is the position of the rear tailgate 2 when the cargo truck 100 is traveling. The open position is a position in which the upper end of the rear tailgate 2 is facing the rear of the vehicle body 101 and is lying on its side. Specifically, it is a position horizontal to the direction in which the cargo truck 100 travels, and when cargo is loaded onto the cargo bed 102, it tilts together with the cargo bed 102 to form a slope between it and the ground G.

[0034] <Operation> Next, referring to Figures 1 to 8, the operation of the rear tailgate device 1 will be explained using Figures 9 to 19. The operation of the rear tailgate device 1 will be explained in the case where the cargo bed 102 is empty, as shown in the figure. Figures 9 through 19 are side views from the left side, similar to Figure 2. Furthermore, for clarity, the structure in Figures 9 through 19 has been simplified. First, as shown in Figure 2, with the rear tailgate 2 in the closed position and the cargo bed 102 in the retracted position, the cargo bed cylinder 500 is activated. In the state shown in Figure 2, the guide roller 403 is in contact with the rear horizontal guide surface 104c of the guide roller guide section 104.

[0035] When the loading platform cylinder 500 is activated in the state shown in Figure 2, the loading platform 102 moves backward along the inclined frame 300, as shown in Figure 9, while the position of the inclined frame 300 relative to the guide frame 400 remains fixed. In other words, of the inclined frame 300 and the loading platform 102, only the loading platform 102 moves. At this time, the front roller 102a, which was on the first guide lane 301a in the state shown in Figure 2, moves to the inclined guide lane 302a. As a result, the loading platform 102 becomes inclined downward from the front end to the rear end. Furthermore, as the cargo bed 102 moves rearward along the inclined frame 300, the rear end of the first bumper stay 710 tilts downward and the upper end of the second bumper stay 720 tilts rearward as the cargo bed 102 moves.

[0036] As shown in Figures 2, 9 through 19, when the loading platform 102 and the guide frame 400 are displaced relative to each other, the bumper roller 740 rotates while in contact with the upper bumper guide surface 103a and the lower bumper guide surface 103b. Also, when the loading platform 102 and the guide frame 400 are displaced relative to each other, the end face of the bumper roller 740 comes into contact with the lateral bumper guide surface 103c. Furthermore, in the state shown in Figure 9, the guide roller 403 is in contact with the rear horizontal guide surface 104c of the guide roller guide section 104.

[0037] From the state shown in Figure 9, when the loading platform cylinder 500 is activated to move the loading platform 102 backward, as shown in Figure 10, the front roller 102a, which was on the inclined guide lane 302a in the state shown in Figure 9, moves to the second guide lane 303a. As a result, the loading platform 102 becomes even more inclined downward from the front end to the rear end than the state shown in Figure 9. In addition, as the loading platform 102 moves, the rear end of the first bumper stay 710 inclins further downward and the upper end of the second bumper stay 720 inclins further backward than the state shown in Figure 9. In the state shown in Figure 10, the guide roller 403 is in contact with the boundary between the rear horizontal guide surface 104c and the inclined guide surface 104b of the guide roller guide section 104.

[0038] From the state shown in Figure 10, when the cargo bed cylinder 500 is activated to move the cargo bed 102 backward, as shown in Figure 11, the longitudinal joist 103, which was not in contact with the sliding member 405 until the state shown in Figure 10, comes into contact with the sliding member 405 as the cargo bed 102 moves. Specifically, as shown in Figure 12, the guide frame opposing portion 103d of the longitudinal joist 103, which is one surface facing the center of the cargo vehicle 100 when viewed from the front-rear direction of the cargo vehicle 100, comes into contact with the sliding member 405. In addition, as the cargo bed 102 moves, from the state shown in Figure 10, the rear end of the first bumper stay 710 tilts downward and the upper end of the second bumper stay 720 tilts backward. In the state shown in Figures 11 and 12, the guide roller 403 is in contact with the inclined guide surface 104b of the guide roller guide section 104.

[0039] From the state shown in Figure 11, the loading platform cylinder 500 is further activated to move the loading platform 102 backward, so that a part of the loading platform 102 (rear roller 102b) touches the ground G, as shown in Figure 13. Even in the state shown in Figure 13, the part of the longitudinal joist 103 facing the guide frame 103d is in contact with the sliding member 405, as shown in Figure 14. At this time, when viewed from the width direction of the cargo truck 100, the rear roller 102b, which is part of the cargo bed 102, touches the ground G before the overall center of gravity CG1 of the cargo truck 100 moves behind the rear axle CG2 of the cargo truck 100. For example, if the center of gravity CG1 moves behind the rear axle CG2 while the transport vehicle is loaded onto the cargo bed 102, the front wheels of the cargo vehicle 100 will lift off the ground G while the rear wheels of the cargo vehicle 100 remain in contact with the ground.

[0040] Furthermore, in the state shown in Figures 13 and 14, the guide roller 403 is in contact with the front horizontal guide surface 104a of the guide roller guide portion 104. Therefore, the inclined guide surface 104b is at least a part of the surface of the guide roller guide portion 104 that contacts the guide roller 403 from above when the posture of the loading platform 102 changes between the stowed position and the position in which only a part of the loading platform 102 is in contact with the ground G. After the rear roller 102b is brought to the ground, the loading platform cylinder 500 is then activated to move the loading platform 102 backward, causing the guide roller 403 to separate from the loading platform 102 (guide roller guide section 104), as shown in Figure 15.

[0041] From the state shown in Figure 15, when the cargo bed cylinder 500 is stopped and the inclined frame cylinder 600 is activated, the inclined frame 300 moves rearward along the guide frame 400 together with the cargo bed 102, as shown in Figure 16. At this time, as the cargo bed 102 and the inclined frame 300 move, the inclined frame 300 becomes tilted downward from the front end to the rear end. From the state shown in Figure 16, if the tilting frame cylinder 600 is operated to move the cargo bed 102 and the tilting frame 300 further to the rear, the state becomes tilted downward from the front end to the rear end, as shown in Figure 17, compared to the state shown in Figure 16.

[0042] From the state shown in Figure 17, if the tilt frame cylinder 600 is further activated to move the loading platform 102 and the tilt frame 300 backward, the second lower roller 305, which was on the horizontal guide lane 401a, moves to the tilt guide lane 402a, as shown in Figure 18. As a result, the tilt frame 300 becomes tilted downward from the front end to the rear end compared to the state shown in Figure 17. From the state shown in Figure 18, the tilt frame cylinder 600 is further activated to move the cargo bed 102 and the tilt frame 300 backward, so that the rear end of the tilt frame 300 and the rear bumper 730 touch the ground G, as shown in Figure 19, and the cargo bed 102 is set to the ground-contacting position.

[0043] Next, the tilting frame cylinder 600 is stopped, and with the rear tailgate 2 in the closed position, the operator rotates the closed rear tailgate 2 in a direction that tilts it toward the open position, thereby opening the rear tailgate 2. After that, the vehicle to be transported is moved from the rear tailgate 2 to the loading platform 102 and loaded onto the loading platform 102. Then, the operator manually rotates the open rear tailgate 2 in a direction that tilts it toward the closed position, thereby closing the rear tailgate 2.

[0044] After loading the vehicle to be transported onto the cargo bed 102 and closing the rear tailgate 2, the inclined frame cylinder 600 is activated to move the inclined frame 300 forward together with the cargo bed 102, as shown in Figure 18. The inclined frame 300 is advanced together with the cargo bed 102, and after the position of the inclined frame 300 relative to the guide frame 400 is fixed as shown in Figure 15, the cargo bed 102 is advanced along the inclined frame 300. Then, the cargo bed 102 is moved forward along the inclined frame 300, and as shown in Figure 2, the cargo bed cylinder 500 is stopped when the cargo bed 102 is in the retracted position.

[0045] <Correspondence with Claims> The inclined guide surface 104b corresponds to at least a portion of the surface of the guide roller guide portion 104 that contacts the guide roller 403 from above when the posture of the loading platform 102 changes between a stowed position and a position in which only a part of the loading platform 102 is in contact with the ground G. The pair of lateral bumper guide surfaces 103c correspond to a pair of bumper roller guides provided on the cargo bed 102, facing the bumper roller 740 along the width direction of the cargo vehicle 100, and in contact with the end faces of the bumper roller 740 when the cargo bed 102 and the guide frame 400 are displaced relative to each other.

[0046] <Effects and Effects of the Embodiment> The cargo vehicle 100 of this embodiment can achieve the following functions and effects. (1) When the posture of the cargo bed 102 changes from a stowed position to a grounded position, the cargo bed lifting device is provided to lower a part of the cargo bed 102 (rear roller 102b) to the ground G before the center of gravity CG1 moves behind the rear axle CG2 when viewed from the width direction of the cargo vehicle 100. Therefore, when changing the posture of the cargo bed 102 from the stowed position to the ground-contacting position, it becomes possible to make contact with the ground G of the cargo bed 102 before the center of gravity CG1 moves behind the rear axle CG2. As a result, it is possible to suppress the lifting of the front of the vehicle body 101 when changing the posture of the cargo bed 102 from a stowed position to a grounded position, without having a configuration that includes support legs to support the cargo bed 102. This makes it possible to provide a cargo vehicle 100 that can suppress structural complexity compared to a configuration that includes support legs.

[0047] (2) The vehicle is equipped with a guide frame 400 that is fixed to the chassis frame 200 and positioned between the chassis frame 200 and the cargo bed 102, and that is displaceable relative to the cargo bed 102. As a result, the guide frame 400, in addition to the chassis frame 200, makes it possible to support the cargo bed 102 in a movable state.

[0048] (3) The cargo bed lifting device includes a guide frame 400 that supports the cargo bed 102 from below and a guide roller 403 that can rotate while in contact with the cargo bed 102. In addition, the cargo bed lifting device includes a guide roller guide section 104 that is attached to the cargo bed 102 and rotates while in contact with the guide roller 403 when the cargo bed 102 and the guide frame 400 are displaced relative to each other. When the posture of the cargo bed 102 changes between a stowed posture and a posture in which only a part of the cargo bed 102 (rear roller 102b) is in contact with the ground G, at least a part of the surface of the guide roller guide section 104 that contacts the guide roller 403 from above (inclined guide surface 104b) is inclined such that the rear is lower than the front when viewed from the width direction of the cargo vehicle 100. As a result, by improving a part of the cargo bed 102 from the existing structure, it becomes possible to suppress the lifting of the front of the vehicle body 101 when changing the posture of the cargo bed 102 from a stowed posture to a grounded posture.

[0049] (4) The vehicle includes a rear bumper 730 positioned behind the guide frame 400, and a bumper stay 700 connected to the guide frame 400 and supporting the rear bumper 730. In addition, the bumper stay 700 includes a pair of bumper rollers 740 whose axis of rotation is parallel to the width direction of the truck 100 and which can rotate while in contact with the cargo bed 102. The pair of bumper rollers 740 are positioned opposite each other in the width direction of the truck 100 and below the cargo bed 102. Furthermore, the cargo bed 102 includes a pair of bumper roller guides (lateral bumper guide surfaces 103c) into which the end faces of the bumper rollers 740 come into contact when the cargo bed 102 and the guide frame 400 are displaced relative to each other. As a result, when moving the cargo bed 102 relative to the guide frame 400, it becomes possible to reduce the misalignment of the cargo bed 102 relative to the guide frame 400 along the width direction of the cargo vehicle 100.

[0050] (5) The cargo bed 102 is provided with a guide frame opposing portion 103d that faces the guide frame 400 in the width direction of the cargo vehicle 100 when the cargo bed 102 and the guide frame 400 are displaced relative to each other. Furthermore, the guide frame 400 is provided with a sliding member 405 that faces the guide frame opposing portion 103d in the width direction of the cargo vehicle 100. Then, the cargo bed 102 and the guide frame 400 are displaced relative to each other with the guide frame opposing portion 103d and the sliding member 405 in contact. As a result, when moving the cargo bed 102 relative to the guide frame 400, it becomes possible to reduce the misalignment of the cargo bed 102 relative to the guide frame 400 along the width direction of the cargo vehicle 100. Furthermore, compared to a configuration without the sliding member 405, it is possible to reduce the contact area between the loading platform 102 and the guide frame 400, thereby reducing the sliding resistance generated between the loading platform 102 and the guide frame 400. [Explanation of Symbols]

[0051] 1. Rear tailgating device 2. Rear taunting 2b Rear tailgate connection section 100 Lorry 101 Vehicle body 102 Cargo bed 102a Front roller 102b Rear roller 102c front bracket 103 Vertical joists 103a Upper bumper guide surface 103b Lower bumper guide surface 103c Side bumper guide surface 103d Guide frame opposing part 104 Guide roller guide section 104a Front horizontal guideway 104b Inclined guideway 104c Rear horizontal guide surface 105 Rear tailgate retaining plate 106 Floorboards G ground 200 Chassis Frame 300 Inclined Frame 301 First horizontal section 301a First guide lane 302a Guide lane for inclined section 303a Second guide lane 302 Inclined section 303 Second horizontal section 304 First lower roller 305 Second lower roller 306 First lower bracket 307 Second lower bracket 400 guide frames 401 Horizontal guide section 401a Horizontal guide lane 402 Inclined guide section 402a Inclined guide lane 403 Guide Roller 404 Retaining Hook 405 Sliding member 500 Cargo bed cylinder 600 Inclined Frame Cylinder 700 Banpaste 710 First Banpaste 720 Second Banpaste 730 Rear Bumper 740 Bumper Roller CG1 Overall center of gravity of cargo truck 100 CG2 Rear axle of cargo truck 100

Claims

1. A cargo vehicle comprising a chassis frame and a cargo bed capable of changing its orientation relative to the chassis frame between a stowed position, which is an orientation in which the cargo bed is positioned on the chassis frame, and a grounded position, which is an orientation in which the cargo bed is positioned on the ground, A cargo vehicle equipped with a cargo bed lifting device that, when the posture of the cargo bed changes from the stowed posture to the grounded posture, causes the rear end of the cargo bed to touch the ground before the overall center of gravity of the cargo vehicle moves behind the rear axle of the cargo vehicle, as viewed from the width direction of the cargo vehicle.

2. A cargo vehicle according to claim 1, comprising a guide frame fixed to the chassis frame and positioned between the chassis frame and the cargo bed, and capable of relative displacement with respect to the cargo bed.

3. The loading platform lifting device comprises the guide frame, which includes a guide roller that supports the loading platform from below and is rotatable while in contact with the loading platform, and the loading platform, which includes a guide roller guide section that rotates while in contact with the guide roller when the loading platform and the guide frame are displaced relative to each other. The cargo vehicle according to claim 2, wherein when the posture of the cargo bed changes between the stowed posture and the posture in which only a part of the cargo bed is in contact with the ground, at least a part of the surface of the guide roller guide portion that contacts the guide roller from above is inclined such that, when viewed in the width direction, the rear is lower than the front.

4. A cargo vehicle comprising a chassis frame, a cargo bed capable of changing its orientation relative to the chassis frame between a stowed position, which is an orientation in which the cargo bed is positioned on the chassis frame, and a grounded position, which is an orientation in which the cargo bed is positioned on the ground, and a guide frame fixed to the chassis frame and positioned between the chassis frame and the cargo bed, and capable of relative displacement with respect to the cargo bed, The cargo bed is equipped with a cargo bed lifting device that, when the posture of the cargo bed changes from the stowed posture to the grounded posture, touches a portion of the cargo bed to the ground before the overall center of gravity of the cargo vehicle moves behind the rear axle of the cargo vehicle, as viewed from the width direction of the cargo vehicle. The cargo bed is equipped with longitudinal joists fixed to the underside of the floorboard on which cargo is loaded, and whose longitudinal direction is parallel to the front-rear direction of the cargo vehicle. The aforementioned longitudinal joists are formed in a shape in which the portion facing outward in the width direction of the cargo vehicle, when viewed from the front-rear direction of the cargo vehicle, The loading platform lifting device comprises the guide frame, which includes a guide roller that supports the loading platform from below and is rotatable while in contact with the loading platform, and the loading platform, which includes a guide roller guide section that rotates while in contact with the guide roller when the loading platform and the guide frame are displaced relative to each other. The aforementioned guide roller guide section is a separate component from the longitudinal joist of a cargo truck.

5. A rear bumper positioned behind the aforementioned guide frame, It comprises a bumper stay connected to the guide frame and supporting the rear bumper, The bumper stay comprises a pair of bumper rollers whose axis of rotation is parallel to the width direction and which are capable of rotating while in contact with the cargo bed. The pair of bumper rollers are positioned opposite each other in the width direction and above the bumper stay. A cargo vehicle according to any one of claims 2 to 4, wherein the cargo bed is provided with a pair of bumper roller guides that contact the end faces of the bumper rollers when the cargo bed and the guide frame are displaced relative to each other.

6. The cargo bed is provided with a guide frame facing portion that faces the guide frame in the width direction when the cargo bed and the guide frame are displaced relative to each other. The guide frame comprises a sliding member that faces the guide frame opposing portion in the width direction, A cargo vehicle according to any one of claims 2 to 5, wherein the cargo bed and the guide frame are displaced relative to each other while the opposing portion of the guide frame and the sliding member are in contact.

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