Self-propelled full trailer

Abstract

This invention provides a self-propelled full trailer that allows for trailer exchange in situations where space is limited, such as at existing transport platform transfer points, without requiring the tractor to move to the front of the trailer. [Solution] A full trailer 3 is towed by a tractor 1 by a drawbar 2, wherein the full trailer 3 is a self-propelled full trailer 3 consisting of an internal combustion engine or an electric vehicle, and is equipped with steering mechanisms 38 on its front wheels 33 and rear wheels 35 respectively to enable driving operations, and furthermore, the drawbar 2 can be attached to either the front or rear side of the self-propelled full trailer 3.

Description

Technical Field

[0001] The present invention relates to a self-propelled full trailer that can not only be towed by a tractor but also travel by itself.

Background Art

[0002] Conventional trailers cannot travel by themselves because they do not have an engine, and it was difficult to move them separately from the tractor. For this reason, trailers that can travel by themselves without relying on a tractor have been proposed (for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, Patent Document 1 only discloses that "not only the tractor 1 but also the trailer 2 has drive wheels" and that "the trailer 2 is mechanically connected to the towing hook 13 of the tractor 1 via the wagon shaft 14". The technology is such that the trailer can only be connected to the tractor at its front part. Incidentally, large-capacity full trailers are effective in increasing the amount that a single driver can carry at once, and in recent years, due to a shortage of drivers and an increase in the volume of goods to be transported, the overall length regulation has been relaxed to 25m. Furthermore, the practical application of trunk line transport from terminal to terminal using "double-trailer trucks" that connect full trailers is being promoted. It seems that the aim is to build a joint transport platform using "double-trailer trucks," but the full trailers have become too long, making it difficult to apply them to existing transport platform relay locations owned by small and medium-sized general freight businesses, considering the handling aspects. Even with the self-propelled full trailer described in Patent Document 1, it is expected that there will be an increasing number of cases where it is physically impossible to handle with existing logistics infrastructure.

[0005] The present invention aims to solve the above problems and provide a self-propelled full trailer that can be connected without the tractor having to move to the front of the trailer, such as when exchanging trailers in an existing transport platform or transfer area where there is limited space. [Means for solving the problem]

[0006] To achieve the above objective, a first aspect of the present invention is a self-propelled full trailer towed by a tractor with a drawbar, wherein the full trailer is a self-propelled full trailer consisting of an internal combustion engine or an electric vehicle, and is equipped with steering mechanisms on its front and rear wheels to enable driving operations, and furthermore, the drawbar can be attached to either the front or rear side of the self-propelled full trailer. A self-propelled full trailer according to a second aspect of the present invention is characterized in that, in the first aspect, the self-propelled full trailer receives signals from a wired or wireless transmitting means and is operated without a driver's seat. A self-propelled full trailer according to a third aspect of the present invention is characterized in that, in the first or second aspect, the drawbar is detachably attached to the self-propelled full trailer. A self-propelled full trailer according to a fourth aspect of the present invention is characterized in that, in the second aspect, the drawbar is provided with a storage function and is attached to the self-propelled full trailer. [Effects of the Invention]

[0007] The self-propelled full trailer of the present invention, while the practical application of truckers that tow full trailers, which become high-capacity full trailer trucks that increase transport capacity, is being promoted, is equipped with a steering mechanism and can also be fitted with a drawbar on either the front or rear side of the vehicle. This makes it highly effective in applying to existing facilities such as transport platforms and transfer points owned by small and medium-sized general freight businesses, as it solves problems that were difficult to handle in terms of trailer replacement and other maneuvers, while keeping the existing facilities as they are. [Brief explanation of the drawing]

[0008] [Figure 1] This is a schematic perspective view of a form of self-propelled full trailer, where the full trailer is connected to a tractor. [Figure 2] Figure 1 is a schematic perspective view of the drawbar area after it has been separated from the tractor and full trailer. [Figure 3] Figure 2 is a schematic perspective view of a full trailer with the drawbar removed. [Figure 4] Figure 3 is a schematic perspective view showing the drawbar attached to the rear of a full trailer, with another tractor approaching. [Figure 5] Figure 4 is a schematic perspective view showing the drawbar connected to another tractor. [Figure 6] This is a block diagram of the control system. [Figure 7] This is a plan view of the main parts around the drawbar attached to the front dolly in Figure 1. [Figure 8] (a) is a front view of Figure 7, (b) is a plan view of the positioning pin in (a), and (c) is a right side view of (b). [Figure 9] This is a view from arrow IX in Figure 7. [Figure 10] Figure 10 is a view taken along arrow X in Figure 7. [Figure 11] This is a schematic plan view showing the movement of full trailers and tractors at a terminal relay station. [Figure 12] This is a schematic plan view showing the movement of the full trailer and tractor over time from the state shown in Figure 11. [Figure 13] This is a schematic plan view showing the movement of the full trailer and tractor over time from the state shown in Figure 12. [Figure 14] This is a perspective view of an alternative full trailer to the one shown in Figure 1. [Figure 15] This is a view along the line XV-XV in Figure 14. [Modes for carrying out the invention]

[0009] The self-propelled full trailer according to the present invention will be described in detail below. Figures 1 to 15 show one form of the self-propelled full trailer of the present invention (hereinafter also simply referred to as "full trailer"), where Figure 1 is a model perspective view of the full trailer connected to a tractor, Figure 2 is a model perspective view of the area around the drawbar separated from the full trailer by the tractor in Figure 1, Figure 3 is a model perspective view of the drawbar removed from the full trailer in Figure 2, Figure 4 is a model perspective view of the drawbar in Figure 3 attached to the rear of the full trailer and another tractor being brought closer, Figure 5 is a model perspective view showing the drawbar in Figure 4 coupled to another tractor, Figure 6 is a block diagram of the control means, Figure 7 is a plan view of the main parts around the drawbar attached to the front dolly in Figure 1, and Figure 8 is (a) a front view of Figure 7, (b) a plan view of the positioning pin in (a), and (c) a right side view of (b). Figure 9 is a view taken along arrow IX in Figure 7, Figure 10 is a view taken along arrow X in Figure 7, Figures 11 to 13 are plan views showing the movement of a full trailer and tractor at a terminal relay base, Figure 14 is a perspective view of a full trailer in a different configuration than the one in Figure 1, and Figure 15 is a view taken along line XV-XV in Figure 14. In each figure, the essential parts are highlighted for clarity, and hatching representing cross-sections is omitted. Also, parts not directly related to the present invention are omitted.

[0010] (1) Configuration of a self-propelled full trailer The self-propelled full trailer 3 of the present invention is a full trailer 3 towed by a tractor 1 by a drawbar 2, and is made of an internal combustion engine or an electric vehicle, and is equipped with steering mechanisms 38 on its front wheels 33 and rear wheels 35, respectively, to enable driving operation (Figure 6). In addition, the drawbar 2 can be attached to either the front or rear side of the self-propelled full trailer 3.

[0011] The full trailer 3 connected to the tractor 1 in Fig. 1 is a self-propelled full trailer 3 consisting of a diesel locomotive equipped with an engine 36. A carriage called a front dolly 32 that can rotate about a vertical axis is provided at the front part of the frame 31 of this self-propelled full trailer 3, and an axle 33a of a front wheel 33 is suspended on the front dolly 32 (Fig. 7). Here, the "front part of the frame 31" refers to the part of the frame 31 arranged on the front side of the full trailer in the vehicle traveling direction where it is connected to the tractor 1 in Fig. 1. Further, a rear dolly 34 that can rotate about a vertical axis is provided at the rear part of the frame 31, and an axle of a rear wheel 35 is suspended on the rear dolly 34.

[0012] And not only the front wheels 33 but also the rear wheels 35 are driving wheels, and power is transmitted to the front wheel axle 33a and the rear wheel axle via a well-known engine 36 and transmission 37. At the same time, a steering mechanism 38 is installed not only at the front part but also at the rear part of the full trailer 3 so that the vehicle traveling direction can be steered not only from the front wheel 33 side but also from the rear wheel 35 side. The self-propelled full trailer 3 is provided with a steering mechanism 38 and a brake mechanism 39. The steering mechanism 38 changes the angle of the front wheels 33, for example, by expanding and contracting the rod of a hydraulic cylinder fixed to the frame 31 near the front wheels 33. On the rear wheel 35 side as well, the angle of the rear wheels 35 is changed by expanding and contracting the rod of a hydraulic cylinder fixed to the frame 31 near it. The front wheel axle 33a and / or the rear wheel axle may be further divided into left and right, and the left axle and the right axle can be rotated by their respective hydraulic cylinders. Incidentally, the wheels or axles to be steered are controlled according to the difference in the traveling mode. The full trailer 3 can perform steering control (regardless of mechanical or electronic) according to the difference in the traveling mode, such as when being towed by the tractor 1 or when moving independently.

[0013] This full trailer 3 is also configured such that the drawbar 2 can be attached to either the front or the rear of the vehicle. Figures 1 and 2 show the state in which the drawbar 2 is attached to the front side of the vehicle of the full trailer 3. The full trailer 3 connected to the first tractor 1A via the drawbar 2 rotatably attaches the proximal end portion 22 of the drawbar 2 to a bracket 322 provided on the front end face 321 of the front dolly 32. Reference numeral 231 indicates a pin that penetrates the guide hole 220 of the proximal end portion 22 and rotatably supports the drawbar 2. Then, using a ring-shaped connecting ring 260 called a lunette eye formed at the tip portion 26 of the drawbar 2, it is rotatably coupled to a coupling tool 15 such as a pintle hook provided at the rear portion of the first tractor 1A. In FIG. 2, the state of being rotatably coupled in accordance with the hole 150 of the coupling tool 15 is schematically shown.

[0014] The full trailer 3 can also attach the drawbar 2 in FIG. 3, which has been removed from the front dolly 32 by removing the pin 231, to the rear dolly 34 side as shown in FIG. 4. A bracket 342 is provided on the rear end face 341 of the rear dolly 34, and the proximal end portion 22 of the drawbar 2 is rotatably attached to the bracket 342. The drawbar 2 attached to the rear side of the vehicle of the full trailer 3 can be attached to a coupling tool 15 provided at the rear portion of the second tractor 1B parked on the rear side of the vehicle by using the lunette eye 260 formed at its tip portion 26.

[0015] And the full trailer 3 of the present embodiment has a traveling control receiving means 6 that receives a signal from a wired or wireless transmitting means 5 so that it can perform a traveling operation without a driver's seat (FIG. 6). The transmitting means 5 includes a CPU (Central Processing Unit) in which fine diodes, transistors, etc. are gathered on the crystal surface of silicon and function as a huge electronic circuit, and together with the receiving means 6, electronically controls the traveling of the full trailer 3. The transmitting means 5 here is wirelessly controlled and has an interface for inputting signals to control the full trailer 3's movement, including steering and braking. Signals transmitted from the transmitting means 5, such as a radio control device held by the worker 8, are caught by a receiver 61 related to the receiving means 6 for movement control. The signals from the receiver 61 are amplified by an amplification circuit 62 and then transmitted to the control means 63 that controls the movement of the self-propelled trailer (Figure 6). In addition to the CPU mentioned above, the control means 63 includes a storage unit consisting of an HDD (Hard Disk Drive), SSD (Solid State Drive), etc., and sends signals to a drive circuit 66 that controls the output of the engine 36, a drive circuit 67 that switches the gears of the transmission 37, a drive circuit 68 for the steering mechanism 38 that controls the turning of the full trailer 3, and a drive circuit 69 for the braking mechanism 39 that stops the trailer. These transmitted signals are transmitted to the engine 36, transmission 37, steering mechanism 38, and braking mechanism 39, which perform movement control of the full trailer 3, such as driving, turning, and stopping.

[0016] By the way, the drawbar 2 shown in Figures 1 to 5 above is a schematic representation, and a specific example of the area around the drawbar 2 is shown in Figures 7 to 10. The drawbar 2 has a bifurcated section 21 that spreads out in a V-shape in plan view and connects to the front dolly 32, and a rod-shaped tip 26 that protrudes from the base of the bifurcated section 21, with a lunette eye 260 at its tip that can be connected to a connector 15 such as a pintle hook provided at the rear end of the tractor 1 (Figure 7). Reference numeral 27 indicates a reinforcing bar that increases the shape strength of the bifurcated section 21. The dimensions of the bar width of the reinforcing bar, the thickness width of the bifurcated section 21, and the shaft diameter of the rod-shaped section are all approximately the same, so that the front view in Figure 8 shows a metal member that is on the same horizontal plane.

[0017] The drawbar 2 has its base end portion 22, which corresponds to the left end of the bifurcated portion 21 in Figures 7 and 8, attached to a bracket 322 provided on the front end surface 321 of the front dolly 32. In the plan view of Figure 7, the bracket 322 has protruding pieces 322b and 322c that extend in a U-shape from a base piece 322a fixed to the front dolly 32, with the opening facing to the right in Figure 7. The base end portion 22 (left end portion in Figure 7) of the bifurcated portion 21 of the drawbar 2 is made into a covered and bottomed cylindrical body, and this covered and bottomed cylindrical body is inserted between the protruding pieces 322b and 322c. Then, the pin 231 of the positioning pin 23 with a fixing plate 232 is inserted from the protruding piece 322b side into a guide hole formed through the central axis of the covered and bottomed cylindrical body from the lid disc to the bottom disc. The fixing plate 232 is brought into contact with the front protruding piece 322b of the bracket 322 as shown in Figure 8(a), causing the pin 231 to pass through the guide hole of the covered and bottomed cylindrical body and further through to the rear protruding piece 322c. In this way, the pin 231 protrudes outward beyond the rear protruding piece 322c. The positioning pin 23 with the fixing plate 232 is secured to the front projection piece 322b of the bracket 322 with a bolt 233, as shown in Figure 10, by utilizing the bolt hole 2320 provided in the fixing plate 232.

[0018] Furthermore, a small hole 2310 is provided at the tip of the pin 231 that protrudes outward from the rear protruding piece 322c, as shown in Figure 9. The lock pin 241, which is part of the shaft lock pin 24 with an arch-shaped spring 242 integrated into its head, is inserted through this small hole 2310 (Figure 9). In addition, by passing the tip of the lock pin 241 through a hole formed at the end of the spring 242, the other end of the pin 231 is locked to the bracket 322.

[0019] In this way, the drawbar 2 is detachably attached to the bracket 322, which is integrated with the front end surface 321 of the front dolly 32, using the pin 231 as a pivot. A lunette eye 260 is formed at the tip 26 of the rod portion, and this lunette eye 260 is used to connect to a connector 15 such as a hook provided at the rear of the tractor 1, making it possible to drive as a tractor 1 with a full trailer 3 as shown in Figure 1. Furthermore, the drawbar 2 can be detachably attached to the bracket 342 on the rear dolly 34 side (see Figure 5) using a positioning pin 23 with a fixing plate 232 and a shaft lock pin 24, as well as to the bracket 342 integrated with the rear end surface 341 of the rear dolly 34. The bracket 342 has the same shape as the one provided on the front dolly 32. Moreover, as a self-propelled trailer, it is equipped with steering mechanisms 38 on its front wheels 33 and rear wheels 35, respectively, allowing for driving operations. Therefore, in cases where trailer exchange is performed at existing transport platform relay bases 9, etc., where there is limited aisle space, the tractor 1 does not need to move to the front of the trailer (front dolly 32 side), resulting in a desired self-propelled full trailer 3 that can be connected to the tractor 1.

[0020] Incidentally, while Figures 1 to 10 described the self-propelled full trailer 3 with drawbars 2 attached to the front dolly 32 and rear dolly 34, the drawbars 2 can be attached to either the front or rear side of the self-propelled full trailer 3. Instead of the front dolly 32 and rear dolly 34, the drawbars 2 may be attached to the frame 31 of the full trailer 3. Figures 14 and 15 show the full trailer 3 with drawbars 2 attached to the front and rear sides of the frame 31. Moreover, the drawbars 2 are equipped with a storage function.

[0021] In Figure 15, the full trailer 3 has a pair of drawbars 2, each with a storage function, installed symmetrically on the front of the frame 31 (on the left side of the figure) and on the rear of the frame 31 (on the right side of the figure). To elaborate on the left-side drawbar 2 in Figure 15, an opening 3110 is formed in the front plate 311 of the frame 31, and the front plate 311 and the surrounding wall 313 form a storage space 31S for the drawbar 2 within the frame 31. The drawbar 2, which was stored in the storage space 31S, can be pulled out from the opening 3110, as shown in the figure, from the tip 26 side where the lunette eye 260 is located. An inner flange 312 is formed around the opening 3110. The drawbar 2 here is a metal rod-shaped body with an outer flange 221 protruding from the end face of the base portion 22, tapering towards the tip 26, and having a lunette eye 260 formed at the tip. In Figure 15, the left drawbar 2, which has been pulled out from the storage space 31S, has an outer flange 221 provided at its base end portion 22 that is locked to the inner flange 312 around the opening 3110, ensuring that the drawbar 2 is in use with almost its entire length extended from the frame front plate 311 as shown in Figure 14.

[0022] On the other hand, when the drawbar 2 is not in use, it can be stored in a storage space 31S formed within the frame 31, as shown in the right drawbar 2 of Figure 15. Similar to the left drawbar 2, the right drawbar 2 of Figure 15 also has an opening 3510 formed in the rear upright plate 315 of the frame 31, and the rear upright plate 315 and the surrounding wall 313 form a storage space 31S for the drawbar 2 within the frame 31. The right drawbar 2, which had its tip 26 side with the lunette eye 260 extended like the left drawbar 2, can be stored in the storage space 31S as shown. The drawbar 2 in the state shown in Figure 15 is positioned so that it can be easily connected to the coupling device 15 located on the rear of the tractor 1, which is to the left in the figure. Furthermore, if the rear of the tractor 1 is to the right in Figure 15, the left drawbar 2 in the figure can be stored in its storage space, and the right drawbar 2 in the figure can be pulled out from its storage space, resulting in a desired self-propelled full trailer 3 that can be easily connected to the coupling device 15 at the rear of the tractor 1.

[0023] In this embodiment, the self-propelled full trailer 3 consists of a diesel or gasoline internal combustion engine, but it is of course possible to use an electric motor for the self-propelled full trailer 3. For example, it is also possible to use an electric motor, as described in Japanese Patent Publication No. 7-500239, which drives the wheels with electric motors individually mounted on the left and right axles, and adjusts the rotational speed and driving torque individually for each. In the figure, reference numeral 11 denotes the tractor cab, reference numeral 12 denotes the tractor frame, reference numeral 13 denotes the tractor tire, reference numeral 239 denotes the stopper, and reference numeral 93 denotes the waiting area.

[0024] (2) One method of using a self-propelled full trailer Next, we will describe an example of the use of this self-propelled full trailer 3. At a terminal relay base 9 as shown in Figures 11 to 13, the first tractor 1A, which is double-coupled and carrying cargo with the full trailer 3 shown in Figure 1 coupled to it, first enters the relay base 9 through gate 90 as indicated by the white arrow in Figure 11. Next, the first tractor 1A and the full trailer 3 are disconnected between the coupling device 15 and the drawbar 2, and then the first tractor 1A is docked at platform 92 and the cargo is unloaded into the terminal warehouse 91 (Figure 12). Meanwhile, the self-propelled full trailer 3 is controlled by worker 8, who holds the transmitter 5 in his hand, to guide it to platform 92. The self-propelled full trailer 3 is equipped with a steering mechanism 38 and can be operated by receiving signals from the transmitter 5, so it can be operated without a driver's seat. As shown in Figure 12, worker 8 can walk and visually check the self-propelled full trailer 3, guiding it to platform 92 and docking it safely. After that, the cargo of the self-propelled full trailer 3 is unloaded into the terminal warehouse 91.

[0025] Meanwhile, the first tractor 1A, which has unloaded its previous cargo and loaded cargo for a new destination, travels in the direction of the dashed line in Figure 13, passes through passage 94, and waits near gate 90. Then, the second self-propelled full trailer 3B, which is carrying cargo for a different destination than the previous full trailer 3 (first full trailer 3A), is guided by a worker 8 using a transmitting device 5 held in their hand, so that the tip 26 of the drawbar 2 attached to the second self-propelled full trailer 3B approaches the coupling device 15 located at the rear of the first tractor 1A. The drawbar 2 of the second full trailer 3B is then coupled to the coupling device 15 at the rear of the first tractor 1A. Next, the first tractor 1A will tow the second full trailer 3B with drawbar 2, and they will head towards their destination.

[0026] Incidentally, when connecting a full trailer 3 to a tractor 1, the vehicles are sometimes positioned so that the rear surface of the tractor 1 and the rear end surface of the full trailer 3 on the side of the rear wheels 35 face each other. In such cases, conventionally, the tractor 1 had to be moved so that its rear surface faced the front end surface 321 on the side of the front wheels 33 of the full trailer 3. However, the width of the passageway 94 in small and medium-sized terminal relay bases 9 is insufficient, and there are cases where the tractor 1 cannot be maneuvered. In such a case, the drawbar 2, which was attached to the front wheel 33 side (front of the vehicle) of the full trailer 3 as shown in Figure 2, is removed, and the removed drawbar 2 is moved and reattached to the rear wheel 35 side (rear of the vehicle) of the full trailer 3 (Figure 4). After that, the operator simply uses the transmitting device 5 to guide the drawbar 2 attached to the rear of the full trailer 3 a little, moving it closer to the coupling device 15 at the rear of the tractor 1, and the drawbar 2 is connected to the coupling device 15. Thus, without having to maneuver the tractor 1, the full trailer 3 towed by the tractor 1 can be easily connected by changing the mounting position of the drawbar 2.

[0027] (3) Effects The full trailer 3 configured in this way is a self-propelled full trailer 3 equipped with a steering mechanism 38 that allows it to be driven. Therefore, after being coupled to the tractor 1 and arriving at a destination such as a terminal relay base 9, if the coupling with the tractor 1 is released, the self-propelled full trailer 3 can be driven freely on its own. Then, when the self-propelled full trailer 3 receives a signal from the wireless or wired transmission means 5 and is driven without a driver's seat, the worker 8 at the relay base 9 holds the transmission means 5 in their hand from the ground site and, while visually observing the movement of the deactivated self-propelled full trailer 3, safely guides it to the platform 92 as shown in Figure 12, enabling smooth docking at the platform 92.

[0028] Furthermore, with a self-propelled full trailer 3, after unloading and loading for a new destination, as shown in Figure 13, worker 8 can easily send a signal from the transmitting device 5 to the self-propelled full trailer 3B to bring the lunette eye 260 of the drawbar tip 26 closer to the coupling device 15 attached to the rear of the towing tractor 1A. In addition, if the self-propelled full trailer 3 is equipped with steering mechanisms 38 on both the front wheels 33 and the rear wheels 35, it can be switched to a driving position where the rear wheels 35 are in the direction of travel, making it easier to maneuver the full trailer 3 in small and medium-sized transport companies' transport platform relay bases 9 or within their own garages where aisle space is limited.

[0029] Furthermore, by allowing the drawbar 2 to be attached to either the front or rear side of the self-propelled full trailer 3, it becomes possible to connect the drawbar 26 to the coupling device 15 as shown in Figures 1 to 5, even if the tractor 1 does not have to move to the front of the trailer, for example, when exchanging trailers at the relay base 9 shown in Figure 13. Therefore, even when exchanging trailers with vehicles traveling in opposite directions side-by-side, it becomes unnecessary to change the direction of tractor 1, simplifying both the work process and the workspace, resulting in excellent efficiency. In the future, securing passage space for maneuvering within terminal relay bases 9 of small and medium-sized transportation companies will be a major issue for the utilization and popularization of double-trailer trucks, but this can be solved all at once. Furthermore, even if the cargo bed's rear door is facing forward and the load is reversed, docking at platform 92 during loading and unloading operations can be done by detaching the self-propelled full trailer 3 and driving it under its own power, so there is no obstacle whatsoever.

[0030] Furthermore, if the drawbar 2 is equipped with a storage function as shown in Figure 15, the drawbar 2, which protrudes far from the front of the full trailer, can be easily stored inside the full trailer 3 when not in use. This also simplifies the storage and management of the drawbar 2. Thus, this self-propelled full trailer 3 exhibits the numerous excellent effects described above and is extremely beneficial.

[0031] Furthermore, the present invention is not limited to the embodiments described above, and various modifications can be made within the scope of the present invention depending on the purpose and application. The shape, size, number, material, etc. of the tractor 1, drawbar 2, self-propelled full trailer 3, transmitting means 5, receiving means 6, etc. can be appropriately selected according to the application. [Explanation of symbols]

[0032] 1 tractor 2 drawbars 21 Proximal part 26 Tip 260 Connecting ring (Lunette eye) 3. Self-propelled full trailer (full trailer) 31 frames 311 Front board 315 Rear standing board 31S Storage space (storage mechanism) 32 Front Dolly 321 Front end surface 322 Bracket 33 Front Wheel 34 Rear Dolly 341 Rear end surface 342 Bracket 35 Rear wheel 38 Steering mechanism 5. Transmission means

Claims

1. A self-propelled full trailer towed by a tractor with a drawbar, wherein the full trailer is a self-propelled full trailer consisting of an internal combustion engine or an electric vehicle, and is equipped with steering mechanisms on its front and rear wheels to enable driving operations, and further characterized in that the drawbar can be attached to either the front or rear side of the self-propelled full trailer.

2. The self-propelled full trailer according to claim 1, wherein the self-propelled full trailer receives a signal from a wired or wireless transmission means and is driven without a driver's seat.

3. The self-propelled full trailer according to claim 1 or 2, wherein the drawbar is detachably attached to the self-propelled full trailer.

4. The self-propelled full trailer according to claim 2, wherein the drawbar is provided with a storage function and the drawbar is attached to the self-propelled full trailer.

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