Motor-truck and loading platform landing mechanism

Abstract

To provide a motor-truck having a loading platform landing mechanism which can smoothly move a loading platform even when unloading the loading platform on uneven ground.SOLUTION: A motor-truck is provided, comprising a loading platform movement inclination mechanism, and a loading platform landing mechanism W is provided on a rear face side of a floor portion 21 of a loading platform 20. The loading platform landing mechanism W has: a wheel support arm 81 having one end portion rotatably supported on the rear face-rear end portion side of the floor portion 21 and the other end portion rotatably supporting a wheel 85; and a hydraulic cylinder 60 undulating the wheel support arm 81. When the loading platform movement inclination mechanism moves the loading platform 20 backward and unloads the same on a ground surface GL, the hydraulic cylinder 60 is operated to raise the wheel support arm 85 downward with the rear face of the floor portion 21 as basis and pull out the wheel 85 downward from the floor portion 21, whereby the wheel 85 is landed on the ground surface GL, and the loading platform 20 is moved in the state separated from the ground surface GL without bringing the rear end portion of the loading platform 20 into contact with the ground surface GL.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a truck and a bed landing mechanism. [Background technology]

[0002] By law, dedicated vehicle carriers for transporting automobiles can only carry automobiles, so if you want to transport bumpers, tires, etc. related to the automobile along with the automobile, you need to prepare a separate freight vehicle that is not dedicated to carrying automobiles (for example, a general freight vehicle). In addition, dedicated vehicle carriers are permitted to have a loading platform of up to 2 / 3 of the wheelbase, so there is a risk of the rear of the loading platform colliding with something while driving in urban areas, etc., so careful driving is required, which places a heavy workload on the driver.

[0003] For this reason, in recent years, vehicles such as automobiles are transported using general freight vehicles equipped with a bed shifting and tilting mechanism that tilts the bed while moving it backward. A general freight vehicle equipped with this bed shifting and tilting mechanism has a rear gate at the rear end of the bed that is used to bridge the bed with the ground. In addition, this general freight vehicle has the advantage that it can carry not only automobiles but also their related parts (tires, bumpers, etc.) on the bed and can be used for purposes other than transporting automobiles. In addition, since the bed of this general freight vehicle is only permitted to be up to 1 / 2 of the wheelbase, it is easier to drive than a dedicated vehicle and the driver's workload can be reduced.

[0004] When loading a vehicle onto a freight vehicle equipped with a rear gate, the platform shifting and tilting mechanism is used to place the rear end of the platform on the ground (positioned for loading and unloading). After that, the worker releases the gate lock mechanism of the platform and rotates the upright rear gate to place the tip (free end) of the rear gate on the ground. This forms a transport path that is continuously connected from the ground by the platform and rear gate. The worker drives the transport vehicle on the ground and passes it through the transport path, allowing the transport vehicle to be loaded onto the platform. After the vehicle is loaded onto the bed, the tip of the rear gate is lifted and rotated to an upright position and fixed by a locking mechanism, and the bed is moved forward by the bed drive means, and the tilting base, which is in an inclined position, is moved forward to return it to a horizontal position.

[0005] Although not a type for transporting vehicles, a configuration in which a platform shifting and tilting mechanism is provided on a general freight / freight vehicle is disclosed in, for example, Patent Document 1. Specifically, the freight vehicle described in Patent Document 1 has a tilting base that is capable of tilting backward with the rear end of the vehicle body as a fulcrum, a sliding cargo platform (hereinafter referred to as the "cargo platform") that is attached on top of the tilting base and overlaps the tilting base in a plan view so that it can slide back and forth from a horizontal position in which it can transport cargo to a loading / unloading position in which the rear end is grounded by tilting the tilting base backward under its own weight when the platform extends rearward beyond the rear end, and a cargo platform drive means that can slide the cargo platform in the forward and backward directions relative to the tilting base. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Utility Model Registration No. 3186284 Summary of the Invention [Problem to be solved by the invention]

[0007] However, in the above-mentioned conventional general freight / freight vehicles, the rectangular, plate-shaped rear gate is fixed in an approximately vertical position relative to the horizontal loading platform when the vehicle is traveling. This means that even when the vehicle is unloaded, the rear gate is subject to wind resistance, resulting in a decrease in fuel efficiency. Therefore, in order to solve the above problem, the applicant of the present application invented a configuration of a cargo bed mechanism for a freight vehicle that does not have a rear gate, and filed a patent application (Patent Application No. 2022-186604) on November 22, 2022.

[0008] The above-mentioned patent application (Patent Application No. 2022-186604) relates to a loading platform mechanism of a freight vehicle equipped with a loading platform moving and tilting mechanism that moves the loading platform in the forward / backward direction along guide rails provided on the chassis to tilt the loading platform or to position the loading platform in a horizontal position on the chassis. Specifically, the loading platform mechanism of the above-mentioned freight vehicle includes a loading platform with a floor on which luggage is placed, a hinge provided at the rear end of the floor, a loading platform rear end slope connected to the rear end of the floor via the hinge, and a locking mechanism for detachably fixing the loading platform rear end slope to the guide rail. The locking mechanism is adapted to fix and lock the loading platform rear end slope to the guide rail in a state in which it is laid down substantially horizontally relative to the loading platform when the guide rail and the loading platform are disposed on the chassis and in a runnable state parallel to the chassis, and is adapted to move the loading platform forward and backward using the loading platform movement and tilting mechanism to lock and unlock the loading platform rear end slope.

[0009] In the configuration of the invention in the above patent application, when the guide rails and the loading platform are placed on the chassis and in a runnable state parallel to the chassis, the locking mechanism fixes and locks the loading platform rear end slope to the guide rail in a state where it is laid down almost horizontally relative to the loading platform. In other words, the invention in the above patent application does not have a rear gate that stands almost vertically relative to the loading platform when the vehicle is runnable, so there is no problem of wind resistance even when the vehicle is empty, and fuel efficiency can be improved compared to freight vehicles with a rear gate.

[0010] On the other hand, in the truck of the invention related to the above patent application, when the platform moving and tilting mechanism tilts the platform and moves it backward to lower it onto the ground, the free end (rear end) of the platform slides backward in contact with the ground. The platform mechanism of the above truck has a problem that the platform cannot be moved smoothly when the area where the platform is to be lowered is uneven. When the area where the platform is to be lowered is uneven, the free end (rear end) of the platform scoops up stones, soil, etc. on the uneven ground while moving the platform backward.

[0011] The present invention has been made in consideration of the above problems, and has an object to provide a truck equipped with a bed moving and tilting mechanism, the truck having a bed landing mechanism that can smoothly move the bed even when lowering the bed onto rough ground. Another object of the present invention is to provide the bed landing mechanism. [Means for solving the problem]

[0012] The present invention, which has been made to solve the above-mentioned problems, is a freight vehicle provided with a platform moving and tilting mechanism that moves a platform in the fore-and-aft direction of the vehicle along guide rails provided on a chassis to lower the platform to the ground surface or to place the platform in a horizontal state on the chassis, the platform has a floor portion that is rectangular in a plan view on which cargo is placed, and a platform landing mechanism equipped with wheels for landing and moving the platform on the ground surface is provided on the underside of the floor, the platform landing mechanism having wheels for landing and moving the platform on the ground surface, the platform landing mechanism having a wheel support arm whose one end is rotatably supported on the underside / rear end side of the floor portion and whose other end supports the wheels rotatably, and a hydraulic cylinder that raises and lowers the wheel support arm based on the underside of the floor, and the platform moving and tilting mechanism moves the platform backward to lower it to the ground surface, When the platform is in a position where the platform is in a vertical position, the hydraulic cylinder is operated to raise the wheel support arm downward with the underside of the floor as a reference and pull the wheels downward from the floor, thereby causing the wheels to land on the ground surface and the rear end of the platform to be separated from the ground surface without contacting the ground surface, and the platform can be moved in a state where the wheels land on the ground surface and the rear end of the platform is separated from the ground surface without contacting the ground surface.When the wheel support arm is approximately raised from the floor and the wheels land on the ground surface, the hydraulic cylinder is operated to raise the other end of the wheel support arm and the wheels toward the floor and cause the wheel support arm to approximately lie down against the floor, thereby lowering the rear end of the platform and causing the rear end of the platform to contact the ground surface, thereby forming a conveying path in which the ground surface and the floor of the platform are continuously connected.

[0013] Further, the wheel is rotatably supported at the other end of the wheel support arm via a rotating shaft provided at the other end, the hydraulic cylinder has a cylinder tube and a piston rod, the rear end of the cylinder tube is rotatably supported on the back surface / rear end side of the floor, and the tip of the piston rod is rotatably connected to the rotating shaft, and the bed landing mechanism is configured such that when the piston rod of the hydraulic cylinder is extended with the wheel support arm substantially lying down against the floor, the wheel and the wheel support arm are pushed towards the rear of the vehicle via the rotating shaft by the hydraulic cylinder, causing the wheel support arm to rotate downward and the front It is desirable that when the hydraulic cylinder rotates downward, the wheel support arm rises approximately downward based on the underside of the floor, and as a result, the wheel supported on the other end of the wheel support arm is pulled downward from the floor, and when the wheel support arm is in a state where it rises approximately downward relative to the floor, when the piston rod of the hydraulic cylinder is contracted, the hydraulic cylinder pulls the wheel and the wheel support arm toward the front of the vehicle via the rotating shaft, the wheel and the wheel support arm are pulled toward the underside of the floor, the rear end side of the loading platform descends, and the rear end of the loading platform comes into contact with the ground surface.

[0014] In this manner, the freight vehicle of the present invention is provided with a bed landing mechanism on the underside of the floor of the bed, the bed having wheels for landing and moving the bed on the ground surface. Furthermore, according to the present invention, when the platform movement and tilt mechanism moves the platform backward and lowers it to the ground surface, the hydraulic cylinder is operated to raise the wheel support arm downward based on the underside of the floor and pull the wheels downward from the floor, thereby allowing the wheels to land on the ground surface and the rear end of the platform to be moved away from the ground surface without touching it. Therefore, according to the freight vehicle of the present invention, even when the cargo bed is lowered onto rough ground, the cargo bed landing mechanism allows the cargo bed to be moved smoothly. In addition, according to the freight vehicle of the present invention, when the bed is moved backward and lowered onto the ground, the rear end (free end) of the bed does not slide backward while abutting on the ground. Therefore, according to the present invention, even if a bed without a rear gate is lowered onto rough ground, the rear end (free end) of the bed can be prevented from stirring up stones, soil, etc. on the ground.

[0015] The present invention also relates to a platform landing mechanism having wheels for landing and moving the platform of a freight vehicle on the ground surface, the freight vehicle being provided with a platform movement and tilt mechanism for moving the platform in the fore-and-aft direction of the vehicle to lower the platform to the ground surface, the platform having a floor portion having a rectangular shape in a plan view on which cargo is placed, the platform landing mechanism having wheel support arms, one end of which is rotatably supported on the underside / rear end side of the floor portion and the other end of which rotatably supports the wheels, and a hydraulic cylinder for raising and lowering the wheel support arms with the underside of the floor as a reference, and when the platform movement and tilt mechanism is moving the platform backward to lower it to the ground surface, the hydraulic cylinder is operated to raise and lower the platform with the underside of the floor as a reference. By raising the wheel support arm downward and pulling the wheels downward from the floor, the wheels can be landed on the ground surface and the rear end of the loading platform can be moved in a state where it is separated from the ground surface without contacting the ground surface, and when the wheel support arm is approximately raised from the floor and the wheels have landed on the ground surface, the hydraulic cylinder is operated to raise the other end of the wheel support arm and the wheels toward the floor and approximately lay down the wheel support arm against the floor, so that the rear end of the loading platform descends and the rear end of the loading platform touches the ground surface, thereby forming a transport path in which the ground surface and the floor of the loading platform are continuously connected. Effect of the Invention

[0016] According to the present invention, it is possible to provide a freight vehicle equipped with a bed moving and tilting mechanism, the freight vehicle having a bed landing mechanism that allows the bed to be moved smoothly even when the bed is being lowered onto rough ground. The present invention also provides the bed landing mechanism. [Brief description of the drawings]

[0017] [Figure 1] 1 is a schematic diagram showing a truck equipped with a bed moving / tilting mechanism and a bed landing mechanism according to an embodiment of the present invention; [Diagram 2] 1 is a schematic diagram for explaining an installation position of a platform landing mechanism according to an embodiment of the present invention. FIG. [Diagram 3] 1A and 1B are schematic diagrams for explaining the operation of the platform landing mechanism of an embodiment of the present invention, in which (a) is a schematic diagram showing a state in which the wheels of the platform landing mechanism have been raised toward the platform, and (b) is a schematic diagram showing a state in which the wheels of the platform landing mechanism have been lowered from the platform and landed on the ground surface. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] Hereinafter, a truck equipped with a bed landing mechanism according to an embodiment of the present invention will be described with reference to the drawings. The bed landing mechanism W of this embodiment is installed on a general freight vehicle equipped with a bed movement and tilt mechanism, and is capable of transporting not only automobiles but also cargo other than automobiles.

[0019] The freight vehicle of this embodiment is characterized by the configuration of the loading platform 20 that is not provided with a rear gate or rear tailgate, and the loading platform landing mechanism W provided on the back side of the loading platform 20, while the configuration of the loading platform movement tilt mechanism and the like is the same as that of the conventional one. Therefore, the above-mentioned features will be described in detail below, and the other configurations will be omitted or simplified.

[0020] Overall structure of freight cars First, the overall configuration of the truck of this embodiment will be described with reference to FIGS. Here, Fig. 1 is a schematic diagram showing a truck equipped with the bed movement tilt mechanism and bed landing mechanism of this embodiment. Fig. 2 is a schematic diagram for explaining the installation position of the bed landing mechanism of this embodiment. Fig. 3 is a schematic diagram for explaining the operation of the bed landing mechanism of this embodiment, where (a) is a schematic diagram showing a state in which the wheels of the bed landing mechanism are raised toward the bed, and (b) is a schematic diagram showing a state in which the wheels of the bed landing mechanism are lowered from the bed and landed on the ground surface.

[0021] As shown in FIG. 1, the cargo vehicle of this embodiment has a cabin 1, a chassis 3 connected to the cabin 1 and extending in the fore-and-aft direction of the vehicle (X direction), a cargo bed 20, and a cargo bed movement and tilt mechanism that supports the cargo bed 20 so that it can be moved freely. On the underside of the cargo bed 20, a cargo bed landing mechanism W equipped with wheels 85 for landing and moving the cargo bed 20 on the ground surface GL is provided.

[0022] The loading platform 20 has a floor 21 that is rectangular in plan view on which cargo such as a vehicle (automobile) is placed, and a gate section 22 that extends upward at a right angle to the floor 21 at the front end side (cabin 1 side) of the floor 21. The loading platform 20 is not provided with a side gate or a rear gate (or a rear gate). The rear end portion of the upper surface of the floor portion 21 is a slope portion 21a that forms an inclined surface, and the portion other than the slope portion 21a (the portion from the front end of the floor portion 21 to the slope portion 21a) is a horizontal surface portion 21b (see FIG. 2). Casters (wheels) 90 are provided at the rear end portion of the lower surface (rear surface) of the floor portion 21. In addition, a cargo bed landing mechanism W, which lands and moves the cargo bed 20 on the ground surface GL, is attached to the rear end portion of the underside (back surface) of the floor 21 (a position a specified distance from the rear end of the cargo bed 20 toward the front of the vehicle) (see Figures 1 and 2).

[0023] The platform movement and tilt mechanism is capable of moving the platform 20 in the forward and backward directions along a guide rail 10 provided on the chassis 3, and can move the platform 20 backward so as to be lowered to the ground surface GL, or place the platform 20 in a horizontal position on the chassis 3.

[0024] Specifically, the bed movement / tilt mechanism includes a pair of guide rails (hereinafter simply referred to as "rails") 10 supported by a tilt base shaft 5 at the rear of the chassis 3. The rails 10 slidably support a bed 20, allowing the bed 20 to move back and forth along the rails 10 in the fore-and-aft direction (X direction) of the vehicle. The bed movement / tilt mechanism also includes support legs 13 formed at the rear of the rails 10 and protruding downward, and a slide cylinder (not shown) that moves the bed 20 back and forth along the rails 10 in the fore-and-aft direction of the vehicle. Note that the slide cylinder may be, for example, a hydraulic cylinder.

[0025] The inclined base shaft 5 supporting the rail 10 is axially fixed perpendicular to the longitudinal direction of the rail 10 between the frames at the rear end of the chassis 3. An engagement portion is formed at the bottom of the rail 10 at a position corresponding to the inclined base shaft 5, and the inclined base shaft 5 is inserted into this engagement portion, so that the rail 10 is supported by the chassis 3 so as to be freely rotatable.

[0026] Furthermore, when the platform 20 is moved rearward in a state in which the rails 10 and platform 20 are placed horizontally (parallel to the chassis 3) on the chassis 3 (for ease of explanation, referred to as the "drivable state"), the slide cylinder of the platform movement tilt mechanism is extended to apply a load to the platform 20 on the vehicle rear side. This causes the platform 20 to move horizontally rearward along the rails 10. Note that the rails 10 themselves do not move horizontally as they are connected to the tilt base shaft 5.

[0027] Then, when the loading platform 20 moves rearward to a certain extent, the weight of the loading platform 20 itself (or the combined weight of the loading platform 2 and the cargo) causes the rail 10 to tilt rearward, and the loading platform 20 moves rearward along the rail 10 while tilting together with the rail 10. That is, when the moment acting rearward from the tilt base axis 5 around the tilt base axis 5 reaches a certain value, the loading platform 20 moves rearward while tilting, and most of the loading platform 20 is lowered to the ground surface GL. The backward movement and tilting operation are completed, for example, by stopping the slide cylinder at the timing when the support leg 13 touches the ground surface GL.

[0028] When returning the loading platform 20 from the inclined state to a horizontal, drivable state, the slide cylinder is contracted to apply a load to the loading platform 20 toward the front of the vehicle, thereby performing the reverse operation to the above. As a result, the loading platform 20 is returned to a parallel state on the chassis 3. In this embodiment, as an example, the platform movement tilt mechanism is of a type that tilts the rail 10 and the platform 20 by the weight of the platform 20 itself (or the combined weight of the platform 20 and cargo) (for example, the platform movement tilt mechanisms described in Japanese Patent Nos. 3172130 and 3361734), but is not limited to this. The platform movement tilt mechanism may be of any configuration as long as it moves the platform 20 backward and tilts it.

[0029] 《Configuration of the platform landing mechanism W》 Next, the loading platform landing mechanism W provided on the lower surface (rear surface) of the loading platform 20 will be described. When the platform 20 is moved backward while tilting and lowered to the ground surface GL by the platform movement and tilt mechanism, the platform landing mechanism W places the wheel support arm 81 supporting the wheel 85 in an upright state in a substantially downward direction relative to the floor 21, as shown in Fig. 3(b). This allows the wheel 85 to land on the ground surface GL when the platform 20 is moved backward while tilting and lowered to the ground surface GL by the platform movement and tilt mechanism.

[0030] Then, as the wheels 85 of the bed landing mechanism W land on the ground surface GL, the bed 20 moves rearward with its rear end (free end) not in contact with the ground surface GL but floating away from the ground surface GL. That is, according to the configuration of the bed landing mechanism W of this embodiment, while the bed movement and tilt mechanism is tilting the bed 20 and moving it rearward to lower the bed onto the ground surface GL, the rear end (free end) of the bed 20 does not slide rearward in contact with the ground surface GL. As a result, according to this embodiment, even when the loading platform 20 is lowered on rough ground, the loading platform 20 can be moved smoothly by the loading platform landing mechanism W. Furthermore, according to the configuration of this embodiment, when the loading platform 20 is lowered on rough ground, stones, soil, etc. on the ground surface GL are prevented from being scooped up onto the loading platform 20.

[0031] Furthermore, when the operation of lowering the platform 20 to the ground surface GL by the platform movement and tilt mechanism is completed, the platform landing mechanism W raises and retracts the wheel support arm 81 supporting the wheel 85 toward the floor 21, placing it in a lying position (as shown in FIG. 3(a)) substantially parallel to the floor 21. As a result, the rear end side of the platform 30 lowers downward, and the caster (wheel) 90 at the rear end of the platform 20 touches the ground surface, resulting in a state in which the ground surface GL and the floor 21 of the platform 20 are continuously connected.

[0032] Specifically, the bed landing mechanism W comprises a pair of wheel support arms 81 rotatably supported on the underside of the rear end of the floor 21 of the bed 20, a rotation shaft S1 provided at the other end of the pair of wheel support arms 81, wheels 85 rotatably supported on the rotation shaft S1, and a hydraulic cylinder 60 for raising and lowering the wheel support arms 81 based on the underside of the floor 21. The hydraulic cylinder 60 has a cylinder tube 61 and a piston rod 62 that moves in and out of the cylinder tube 61, and the rear end of the cylinder tube 61 is rotatably supported on the back surface of the rear end side of the floor 21 of the cargo bed 20, and the tip end of the piston rod 62 is rotatably connected to the rotation axis S1.

[0033] In addition, the wheel support arm 81 is formed in an approximately long plate shape, and one end thereof is supported so as to be freely rotatable on a rotation axis S2 provided on a support bracket 80 attached to the underside of the slope portion 20a on the rear end side of the floor 21 of the cargo bed 20. A rotating shaft S1 is provided at the other end of the wheel support arm 81, and a wheel 85 is rotatably supported by this rotating shaft S1. A tip end of a piston rod 62 of a hydraulic cylinder 60 is rotatably connected to the rotating shaft S1. In addition, the end of the cylinder tube 61 of the hydraulic cylinder 60 is rotatably supported by a rotation shaft S3 provided on a support bracket 70 attached to the rear surface of the horizontal surface 20b at the rear end side of the floor 21 of the cargo bed 20.

[0034] When the piston rod 62 of the hydraulic cylinder 60 is in a contracted state stored in the cylinder tube 61, as shown in Figure 3(a), the hydraulic cylinder 60 pulls the wheel 85 and the wheel support arm 81 toward the front of the vehicle via the rotation axis S1, causing the wheel support arm 81 to lie down approximately parallel to the underside of the floor 21. As a result, the wheel 85 supported at the other end of the wheel support arm 81 is held in a position close to the underside of the floor 21.

[0035] On the other hand, when the piston rod 62 of the hydraulic cylinder 60 is extended in the state shown in FIG. 3(a), the hydraulic cylinder 60 pushes the wheel 85 and the wheel support arm 81 toward the rear of the vehicle via the rotation axis S1, and the wheel support arm 81 rotates downward around the rotation axis S2 as the center of rotation, and the hydraulic cylinder 60 rotates downward around the rotation axis S3 as the center of rotation, as shown in FIG. 3(b). As a result, the wheel support arm 81 stands upright in a substantially downward direction based on the back surface of the floor 21, and the wheel 85 supported at the other end of the wheel support arm 81 is pulled out downward from the floor 21. That is, the hydraulic cylinder 60 and the wheel support arm 81 are bent in a substantially L-shape and protrude downward from the floor 21.

[0036] 3(b), when the piston rod 62 of the hydraulic cylinder 60 is contracted, the wheel 85 and the wheel support arm 81 are pulled toward the front of the vehicle via the rotation axis S1 by the hydraulic cylinder 60, and the wheel support arm 81 rotates toward the floor 21 around the rotation axis S2 as the center of rotation, and the hydraulic cylinder 60 rotates toward the floor 21 around the rotation axis S3 as the center of rotation. As a result, the wheel support arm 81 is placed in a state of being substantially laid down against the rear surface of the floor 21, and accordingly, the wheel 85 supported at the other end of the wheel support arm 81 is held in a position close to the rear surface of the floor 21, as shown in FIG.

[0037] <<Operation of the platform landing mechanism W>> Next, the operation of the platform landing mechanism W of the truck of this embodiment will be described. In this embodiment, when the truck is in a drivable state (the rails 10 and the cargo bed 20 are placed horizontally on the chassis 3), the cargo bed landing mechanism W is retracted into the underside of the floor 21, as shown in Figure 3(a).

[0038] Then, when the platform movement / tilt mechanism extends the slide cylinder and applies a load to the vehicle rear side of the platform 20 to tilt the platform 20 and move it backward to lower it onto the ground surface GL, the piston rod 62 of the hydraulic cylinder 60 of the platform landing mechanism W is extended to pull out the wheels 85 downward from the floor 21 as shown in Fig. 3(b). In this state, when the platform 20 is lowered onto the ground surface GL while moving backward, the wheels 85 of the platform landing mechanism W land on the ground surface GL, and the platform 20 moves smoothly backward by the rotation of the wheels 85. In addition, when the wheels 85 of the platform landing mechanism W land on the ground surface GL, the rear end of the platform 20 is lifted off the ground surface GL, and the rear end (free end) of the platform 20 does not slide rearward while in contact with the ground surface GL when the platform 20 is being moved rearward and lowered onto the ground surface GL. As a result, according to this embodiment, it is possible to prevent the rear end (free end) of the platform 20 from stirring up stones, soil, etc. on the ground surface GL when the platform 20 is being lowered onto rough ground. In addition, the platform 20 can be moved rearward smoothly even on rough ground.

[0039] Furthermore, when the piston rod 62 of the hydraulic cylinder 60 of the platform landing mechanism W is contracted in a state where the platform 20 has been lowered onto the ground surface GL (the state shown in FIG. 3(b)), the hydraulic cylinder 60 pulls the wheels 85 and the wheel support arms 81 towards the front of the vehicle via the rotation shaft S1, and the wheels 85 and the wheel support arms 81 are retracted onto the underside of the floor 21. At this time, the rear end of the platform 20 descends, and the casters (wheels) 90 at the rear end of the platform 20 come into contact with the ground surface, forming a conveying path that is continuously connected to the ground surface GL and the platform 20 (the state shown in FIG. 3(a)).

[0040] When returning the bed 20 onto the chassis 3, the piston rod 62 of the hydraulic cylinder 60 of the bed landing mechanism W in the state shown in FIG. 3(a) is extended. As a result, the hydraulic cylinder 60 pushes the wheels 85 and the wheel support arm 81 toward the rear of the vehicle via the rotating shaft S1, and the wheel support arm 81 stands upright downward relative to the rear surface of the floor 21, resulting in a state in which the wheels 85 are pulled out downward from the floor 21. At this time, the rear end side of the bed 20 rises, and the casters (wheels) 90 at the rear end of the bed 20 also rise and are separated from the ground surface GL (the state shown in FIG. 3(b)). After that, the bed movement tilt mechanism contracts the slide cylinder, so that the bed 20 moves forward, and the bed 20 can be returned to a state parallel to the chassis 3 on the chassis 3. In this embodiment, the wheels 85 of the bed landing mechanism W allow the bed 20 to move forward smoothly even on uneven ground.

[0041] As described above, the cargo truck of this embodiment is provided with a cargo bed landing mechanism W on the underside of the floor 21 of the cargo bed 20, which is equipped with wheels 85 for landing and moving the cargo bed 20 on the ground surface GL. According to this embodiment, when the loading platform movement and tilt mechanism moves the loading platform 20 backward and lowers it to the ground surface GL, the hydraulic cylinder 60 is operated to raise the wheel support arm 81 downward based on the underside of the floor 21, thereby pulling the wheels 85 downward from the floor 21, so that the wheels 85 land on the ground surface GL and the loading platform 20 can be moved in a state where it is separated from the ground surface GL (floating state) without the rear end of the loading platform 20 coming into contact with the ground surface GL.

[0042] Therefore, according to the freight vehicle of this embodiment, even when the cargo bed 20 is lowered onto rough ground, the cargo bed landing mechanism W allows the cargo bed 20 to be moved smoothly. Furthermore, according to the freight vehicle of this embodiment, while the bed 20 is being moved backward and lowered onto the ground surface, the rear end (free end) of the bed 20 does not slide backward while abutting against the ground surface GL. Therefore, even if the bed 20, which is not provided with a rear gate, is lowered onto rough ground as in this embodiment, the rear end (free end) of the bed 20 can be prevented from stirring up stones, soil, etc. on the ground surface.

[0043] In addition, since the cargo truck of this embodiment does not have a rear gate on the loading platform 20 and the rear end side of the loading platform 20 is a slope section 21a forming an inclined surface, it is possible to form a conveying path that continuously connects the ground surface GL and the loading platform 20 simply by lowering the loading platform 20 to the ground surface GL using the loading platform moving tilt mechanism and operating the loading platform landing mechanism W. In other words, according to this embodiment, unlike conventional rear gates (or rear tailgates), "when loading or unloading cargo such as vehicles onto the loading platform, the worker needs to operate the rear gate of the loading platform to lock or unlock the rear gate each time," which eliminates the need for the worker to do this, significantly reducing the workload of the worker.

[0044] In addition, in this embodiment, since there is no rear gate or tailgate at the rear end of the cargo bed 20, there is no strong wind resistance while traveling, as in the case of a freight vehicle equipped with a "rear gate that is fixed vertically to the cargo bed" in the prior art. In other words, according to the configuration of the freight vehicle of this embodiment, the problem of "being subjected to wind resistance even when unladen" that occurs with freight vehicles equipped with rear gates of the conventional technology does not occur, and fuel efficiency can be improved compared to freight vehicles equipped with rear gates of the conventional technology. In addition, in this embodiment, since there is no rear gate or tailgate at the rear end of the cargo bed 20, even when, for example, an automobile (vehicle) with a long overall length is loaded onto the cargo bed 20 and transported, the bumper of the vehicle being transported will not be damaged, as in the case of a freight truck equipped with a rear gate.

[0045] As described above, according to this embodiment, a freight vehicle having a bed movement tilt mechanism and a bed landing mechanism W that can smoothly move the bed 20 even when the bed is being lowered onto rough ground can be provided. Also, according to this embodiment, a freight vehicle having a bed landing mechanism W that prevents stones, soil, etc. on the ground surface from being scooped up onto the bed 20 even when the bed is being lowered onto rough ground can be provided.

[0046] The present invention is not limited to the above-described embodiment, and various modifications are possible within the scope of the present invention. For example, in the above-described embodiment, the bed landing mechanism W is provided on the bed 20 that is not provided with a rear gate, but the present invention is not limited to this. The bed landing mechanism W may be attached to a bed 20 that is provided with a rear gate. Even in such a case, the bed 20 can be moved smoothly when lowering the bed 20 onto rough ground. [Explanation of symbols]

[0047] W… Freight car 1. Cabin 3…Chassis 5...Tilt axis 10...Guide rail 13...Support leg 20…Cargo platform 21…Floor part 21a…Slope section 21b…Horizontal surface part 22…Torii section 25...Ground roller 30…Rear end ramp for loading platform 40…hinge 50...Lock mechanism 50A...tongue part 50B…Receiving part 50B1…Aperture

Claims

1. A truck equipped with a platform moving and tilting mechanism that moves a platform in the vehicle front-rear direction along a guide rail provided on a chassis to lower the platform to the ground or to place the platform horizontally on the chassis, The loading platform has a floor portion that is rectangular in plan view on which cargo is placed, A platform landing mechanism having wheels for landing and moving the platform on the ground surface is provided on the underside of the floor portion, The loading platform landing mechanism includes: a wheel support arm having one end rotatably supported on the rear end side of the floor portion and having the other end rotatably supporting the wheel; a hydraulic cylinder for raising and lowering the wheel support arm based on the underside of the floor portion; When the platform movement / tilt mechanism is moving the platform backward and lowering it to the ground surface, the hydraulic cylinder is operated to raise the wheel support arm downward based on the underside of the floor and pull the wheels downward from the floor, thereby allowing the wheels to land on the ground surface and the platform to be moved in a state where the rear end of the platform is separated from the ground surface without contacting the ground surface, A freight truck characterized in that, when the wheel support arm is approximately upright relative to the floor and the wheel is on the ground surface, the hydraulic cylinder is operated to raise the other end of the wheel support arm and the wheel toward the floor side and approximately lay down the wheel support arm against the floor, causing the rear end of the loading platform to descend and contact the ground surface, thereby forming a transport path that is continuously connected to the ground surface and the floor of the loading platform.

2. The wheel is rotatably supported at the other end of the wheel support arm via a rotation shaft provided at the other end of the wheel support arm, The hydraulic cylinder has a cylinder tube and a piston rod, a rear end of the cylinder tube is rotatably supported on the rear end side of the back surface of the floor portion, and a front end of the piston rod is rotatably connected to the rotation shaft, The loading platform landing mechanism includes: When the piston rod of the hydraulic cylinder is extended while the wheel support arm is substantially laid down relative to the floor, the hydraulic cylinder pushes the wheel and the wheel support arm toward the rear of the vehicle via the rotating shaft, causing the wheel support arm to rotate downward and the hydraulic cylinder to rotate downward, causing the wheel support arm to stand up substantially downward based on the underside of the floor, and as a result, the wheel supported at the other end of the wheel support arm is pulled out downward from the floor, 2. The truck according to claim 1, characterized in that when the wheel support arm is in an upright position approximately downward relative to the floor and the piston rod of the hydraulic cylinder is contracted, the hydraulic cylinder pulls the wheel and the wheel support arm toward the front of the vehicle via the rotating shaft, the wheel and the wheel support arm are pulled toward the underside of the floor, the rear end side of the cargo bed descends, and the rear end of the cargo bed comes into contact with the ground surface.

3. A platform landing mechanism having wheels for landing and moving the platform of a freight vehicle on a ground surface, The truck is provided with a platform moving and tilting mechanism that moves the platform in the vehicle front-rear direction and lowers the platform to the ground surface, The loading platform has a floor portion that is rectangular in plan view on which cargo is placed, The loading platform landing mechanism includes: a wheel support arm having one end rotatably supported on the rear end side of the floor portion and having the other end rotatably supporting the wheel; a hydraulic cylinder for raising and lowering the wheel support arm based on the underside of the floor portion; When the platform movement / tilt mechanism is moving the platform backward and lowering it to the ground surface, the hydraulic cylinder is operated to raise the wheel support arm downward based on the underside of the floor and pull the wheels downward from the floor, thereby allowing the wheels to land on the ground surface and the platform to be moved in a state where the rear end of the platform is separated from the ground surface without contacting the ground surface, A platform landing mechanism characterized in that, when the wheel support arm is approximately upright relative to the floor and the wheels are landed on the ground surface, the hydraulic cylinder is operated to raise the other end of the wheel support arm and the wheels toward the floor side, causing the wheel support arm to approximately lie flat against the floor, thereby causing the rear end of the platform to descend and make contact with the ground surface, thereby forming a transport path in which the ground surface and the floor of the platform are continuously connected.

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