Folding cart flexible steering system

Abstract

The application discloses a folding cart flexible steering system, comprises: a folding cart body, wherein the bottom of the folding cart body is provided with wheels. The bottom of the folding cart body is further provided with a steering assembly. The steering assembly is at least connected to wheels at one end. The two sides of at least one end of the folding cart body are rotationally connected to folding rods respectively. At least one end of the folding cart body is further provided with a pull rod assembly, and the two folding rods are rotationally connected to the pull rod assembly. The bottom of the pull rod assembly is further connected to the steering assembly. By using the described design, the pull rod assembly is supported by the folding rods, such that the pull rod assembly is connected to the steering assembly between the wheels, and controls the movement of the steering assembly, so as to control the steering of the wheels. The structural design is reasonable, the structure is simple, and operation is convenient. By providing a steering assembly, the wheels can be straight fork swivel casters, so that the folding cart is safer to use, and the movement is more stable. Also, the steering assembly adopts a flexible structural member, so that the folding of the folding cart body is not affected, the cost is low, and the folding cart has large market application prospects.

Description

A flexible steering system for folding trailer Technical Field

[0001] The utility model relates to the technical field of trailers, in particular to a flexible steering system for a folding trailer. Background Art

[0002] A foldable trailer is a foldable and towable cargo vehicle. It is widely used in transporting things because of its simplicity of use, ability to carry cargo, ease of storage, and time and labor saving. It is now often used in outdoor activities or short-distance transportation.

[0003] At present, existing trailers, whether foldable or not, usually use oblique fork universal wheels to facilitate steering. Due to its structural design (the wheel axis and the rotation axis are not on the same vertical line), the oblique fork universal wheel is more convenient and labor-saving in steering than the traditional straight fork universal wheel (the wheel axis and the rotation axis are on the same vertical line). It will rotate according to the direction of force transmission. However, at the same time, due to its free steering, it will be more difficult to control than the straight fork universal wheel, especially on loaded and inclined uphill roads. At this time, the oblique fork universal wheel will turn in the direction of the sliding force due to the influence of the sliding force. In order to prevent the trailer from losing control of its direction, it can only be pulled in the opposite direction by manpower, which brings inconvenience to its use. Moreover, trailers are usually used outdoors. When the road surface is rough, the free movement characteristics of the inclined fork universal wheel will cause the inclined fork universal wheel to turn by itself when squeezed by the uneven road surface. Although the inclined fork universal wheel can be straightened by increasing the forward force, the inclined fork universal wheel is in a tilted state due to the squeezing, and the resistance of the uneven road surface is added. At this time, the force applied needs to be greater than the various resistances, which is even more so when overloaded, which greatly affects the user experience of the trailer.

[0004] Therefore, it is urgent to design a foldable trailer flexible steering system to overcome the above-mentioned deficiencies of one or more prior arts. Summary of the Invention

[0005] The technical solution adopted by the present invention to solve the above-mentioned technical problems is: a flexible steering system for a folding trailer, characterized in that it includes: a folding body, the folding body is a gathering type, wheels are respectively provided at both ends of the bottom of the folding body, a steering assembly is also provided at the bottom of the folding body, the steering assembly is connected to the wheel at least at one end, the steering assembly is used to drive the connected wheel to steer, folding rods are respectively rotatably connected on both sides of at least one end of the folding body, a pull rod assembly is also provided at at least one end of the folding body, the adjacent ends of the two folding rods are respectively rotatably connected to the pull rod assemblies, and the bottom of the pull rod assembly is also connected to the steering assembly.

[0006] In a preferred embodiment, there are two wheels at each end, the steering assembly is located between the two wheels at the same end, and the front and rear ends of each wheel at the same end as the steering assembly are respectively provided with wheel swing arms, and each end of the steering assembly is rotatably connected to the two wheel swing arms at the corresponding end.

[0007] In a preferred embodiment, the steering assembly includes: a cable, two cables are provided, both ends of each cable are rotatably connected to the two wheel swing arms at the same end, and the bottom of the pull rod assembly is rotatably connected to at least one of the cables.

[0008] In a preferred embodiment, adjacent ends of the two folding rods are respectively embedded with synchronous teeth, the two synchronous teeth are engaged with each other, the adjacent ends of the two folding rods are connected together through a connecting kit, and the bottom of the pull rod assembly is rotatably connected to the connecting kit.

[0009] In a preferred embodiment, the pull rod assembly includes: a movable head, which is located on the side of the connecting kit and is rotatably connected to the connecting kit, a transmission rod is fixedly provided at the bottom of the movable head, and the end of the transmission rod away from the movable head is rotatably connected to the steering assembly, and the top of the movable head is rotatably connected to a direction pull rod, and the direction pull rod is retractable.

[0010] In a preferred embodiment, a reinforcement piece is embedded in one end of the direction pull rod connected to the movable head, and the reinforcement piece is rotatably connected to the movable head.

[0011] In a preferred embodiment, a sleeve is further provided on the outside of the direction pull rod, the outer circle of the sleeve is circular, and a clamp is further provided in the middle of one end of the folding body corresponding to the pull rod assembly, and the clamp is adapted to the sleeve.

[0012] In a preferred embodiment, the rotation axis of the steering rod and the rotation axis of the wheel at the same end are located on the same straight line.

[0013] In a preferred embodiment, the cable is a flexible structural member.

[0014] In a preferred embodiment, the folding vehicle body is further provided with a controller and a power source electrically connected to the controller, and the wheel at at least one end is a powered wheel and electrically connected to the controller.

[0015] In a preferred embodiment, the folding vehicle body is provided with an electric steering device at one end where the power wheel is located, and the electric steering device is connected to the corresponding wheel via a connecting piece.

[0016] In a preferred embodiment, the foldable vehicle body comprises: a plurality of foldable side bracket assemblies, the plurality of side bracket assemblies enclose a frame with upper and lower openings, the bottom of the frame is connected to a foldable bottom bracket

[0017] The beneficial effects of the present invention are as follows: by arranging symmetrical folding rods at the ends of the folding body, the pull rod assembly is supported by the folding rods, the steering assembly connection between the pull rod assembly and the wheels is realized, and the movement of the steering assembly can be controlled, thereby controlling the steering of the wheels. The structural design is reasonable, the structure is simple, and the operation is convenient. At the same time, through the setting of the steering assembly, the wheels can directly adopt straight fork universal wheels, making the use of the folding trailer safer and the driving more stable. The steering assembly adopts flexible structural parts, which does not affect the folding of the folding body, and the cost is also low, and it has a large market application prospect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic structural diagram of the present invention;

[0019] Figure 2 is a schematic diagram of the connection between the wheel and the steering assembly of the present invention;

[0020] Figure 3 is a schematic structural diagram of the folding rod of the utility model;

[0021] Figure 4 is an exploded view of the pull rod assembly of the present invention;

[0022] FIG5 is a diagram of the present invention in a folded state.

[0023] In the picture:

[0024] 10. Folding body; 101. Clamp; 11. Wheel; 111. Wheel swing arm; 12. Folding rod; 121. Connecting kit; 122. Synchronizing gear; 123. Avoidance groove; 13. Steering assembly; 131. Cable; 14. Pull rod assembly; 141. Movable head; 142. Transmission rod; 143. Steering rod; 144. Reinforcement member; 145. Sleeve; 15. Electronic steering device. DETAILED DESCRIPTION

[0025] To make the above-mentioned objects, features, and advantages of the present invention more clearly understood, the following detailed description of specific embodiments of the present invention is provided in conjunction with the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0026] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms, "connection", and "installation" should be understood in a broad sense. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. In addition, "communication" can be a direct connection or an indirect connection through an intermediate medium. Here, "fixed" means that the two are connected to each other and the relative position relationship after connection remains unchanged. The directional terms mentioned in the embodiments of the present invention, such as "inside", "outside", "top", "bottom", etc., are only reference to the directions of the accompanying drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the embodiments of the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present invention.

[0027] In the embodiments of the present invention, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, features specified as "first" or "second" may explicitly or implicitly include one or more of the features.

[0028] In the embodiments of the present invention, "and / or" is simply a description of the association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the related objects are in an "or" relationship.

[0029] References to "one embodiment" or "some embodiments" in this specification mean that one or more embodiments of the present invention include a particular feature, structure or characteristic described in conjunction with that embodiment. Thus, phrases such as "in one embodiment," "in some embodiments," "in other embodiments," and "in other embodiments" that appear in different places in this specification do not necessarily refer to the same embodiment, but rather mean "one or more but not all embodiments," unless otherwise specifically emphasized. The terms "comprise," "include," "have," and their variations all mean "including but not limited to," unless otherwise specifically emphasized. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0030] As shown in Figures 1 to 5, the present invention provides a flexible steering system for a folding trailer, comprising: a folding body 10, the folding body being of a gathered type, wheels 11 being provided at both ends of the bottom of the folding body 10, a steering assembly 13 being further provided at the bottom of the folding body 10, the steering assembly 13 being connected to the wheel 11 at least at one end, the steering assembly 13 being used to drive the connected wheel 11 to steer, folding rods 12 being rotatably connected to both sides of at least one end of the folding body 10, a pull rod assembly 14 being further provided at at least one end of the folding body 10, adjacent ends of two folding rods 12 being rotatably connected to the pull rod assembly 14, and the bottom of the pull rod assembly 14 being further connected to the steering assembly 13;

[0031] Specifically, the folding body 10 is a gathering type body. The gathering type folding body 10 is a rectangular frame formed by side bracket assemblies that can be folded in the front, rear, left and right directions, and the bottom surface of the frame is also provided with a foldable bottom bracket. When folded, the middle bottom bracket arches upward, and the four side bracket assemblies in the front, rear, left and right directions gather and fold toward the middle from four directions. The volume of this type of vehicle body after folding is smaller and more convenient to carry, so the present application preferably adopts a gathering type vehicle body. Although the present application adopts a gathering type vehicle body, the structure of the present application is also suitable for a folding type vehicle body, that is, a vehicle body with a raised middle and front and rear ends close to the middle; wheels 11 are respectively provided at both ends of the bottom of the folding vehicle body 10, and a steering assembly 13 is also provided at the bottom of the folding vehicle body 10. The steering assembly 13 is connected to the wheel 11 at at least one end to drive the rotation of the wheel 11 to control the walking direction of the folding vehicle body 10. A folding rod 12 is provided at at least one end of the two ends of the folding vehicle body 10. The folding rod 12 has two folding rods 12, and the two folding rods 12 are symmetrically arranged. The ends away from each other are respectively rotatably connected to the folding vehicle body 10, and the two folding rods 12 can be rotated vertically relative to the folding vehicle body 10 to adapt to the folding. The vehicle body 10 is folded, and a pull rod assembly 14 is provided on at least one end of the folding vehicle body 10. The pull rod assembly 14 is located at one end adjacent to the two folding rods 12 and is rotatably connected to the folding rods 12 respectively. When the folding rods 12 rotate relative to the folding vehicle body 10, the pull rod assembly 14 will be driven to rise or fall, wherein the pull rod assembly 14 can also be horizontally rotated relative to the folding rod 12. The bottom of the pull rod assembly 14 is connected to the steering assembly 13. When the pull rod assembly 14 rotates horizontally, it drives the steering assembly 13 to move, and the steering assembly 13 drives the wheel 11 to move. It should be pointed out that the number of folding rods 12 and pull rod assemblies 14 may not be equal. When the folding rod 12 and the pull rod assembly 14 are only provided at one end of the folding vehicle body 10, the folding rod 12 and the pull rod assembly 14 need to be located at the same end. When the folding rods 12 are provided at both ends, the pull rod assembly 14 may be provided at only one end.

[0032] It should be pointed out that since the wheels 11 are connected together through the steering assembly 13, their rotation is driven by the steering assembly 13, so the wheels 11 can be straight-fork universal wheels, which can be more stable than oblique-fork universal wheels during driving and cannot rotate freely. They will only rotate when subjected to force in a specific direction, thereby improving safety in use. In addition, under heavy load conditions, straight-fork universal wheels are easier to steer.

[0033] Furthermore, each end of the wheel 11 is provided with two wheels, and the steering assembly 13 is located between the two wheels 11 at the same end. The front and rear ends of each wheel 11 at the same end as the steering assembly 13 are respectively provided with a wheel swing arm 111, and each end of the steering assembly 13 is rotatably connected to the two wheel swing arms 111 at the corresponding end.

[0034] Specifically, each end of the folding body 10 is provided with two wheels 11, and the steering assembly 13 is located between the two wheels 11 at one end. The front and rear ends of the two wheels 11 are provided with wheel swing arms 111 extending horizontally outward. The two ends of the steering assembly 13 are respectively rotatably connected to the corresponding wheel swing arms 111. When the steering assembly 13 moves to one side, it drives the two wheels 11 to rotate synchronously.

[0035] Furthermore, the steering assembly 13 includes: a cable 131, wherein two cables 131 are provided, and both ends of each cable 131 are rotatably connected to the two wheel swing arms 111 at the same end, and the bottom of the pull rod assembly 14 is rotatably connected to at least one of the cables 131;

[0036] Specifically, the steering assembly 13 includes two cables 131, one cable 131 is rotatably connected to the wheel swing arm 111 at the front end of the wheel 11, and the other cable 131 is rotatably connected to the wheel swing arm 111 at the rear end of the wheel 11. One cable 131 is used to enable the two wheels 11 to be linked, and the other cable 131 is used to be connected to the pull rod assembly 14, and is driven by the pull rod assembly 14 to drive one of the wheels 11 to rotate. When one wheel 11 rotates, the other wheel 11 will be driven synchronously through the cable 131.

[0037] Furthermore, in this embodiment, adjacent ends of the two folding rods 12 are respectively embedded with synchronous teeth 122, and the two synchronous teeth 122 are meshed with each other. The adjacent ends of the two folding rods 12 are connected together through a connecting sleeve 121, and the bottom of the pull rod assembly 14 is rotatably connected to the connecting sleeve 121;

[0038] Specifically, since the two folding rods 12 are connected together by the connecting kit 121 and are not directly connected, the two folding rods 12 will have inconsistent rotation angles when they rotate, causing the pull rod assembly 14 connected to the connecting kit 121 to tilt, affecting normal use. For this reason, a synchronous tooth 122 is fixedly embedded at one adjacent end of the two folding rods 12, and the two synchronous teeth 122 are in a meshing state. Through the meshing of the two synchronous teeth 122, the two folding rods 12 are rotated synchronously, and the angles are also the same, thereby ensuring that the pull rod assembly 14 can always be in a vertical state. At the same time, after the two folding rods 12 are folded, the ends of the synchronous teeth 122 will contact the top wall of the connecting kit 121. In order to avoid the folding rod 12 being unable to rotate due to the restriction of the connecting kit 121, a avoidance groove 123 is also provided on the top surface of the connecting kit 121. When the folding rod 12 rotates, the ends of the synchronous teeth 122 will extend out of the connecting kit 121 through the avoidance groove 123.

[0039] Furthermore, the pull rod assembly 14 includes: a movable head 141, the movable head 141 is located at the side of the connecting kit 121 and is rotatably connected to the connecting kit 121, a transmission rod 142 is fixedly provided at the bottom of the movable head 141, and one end of the transmission rod 142 away from the movable head 141 is rotatably connected to the steering assembly 13, and the top of the movable head 141 is rotatably connected to a direction pull rod 143, and the direction pull rod 143 is retractable.

[0040] Specifically, the pull rod assembly 14 includes: a movable head 141, which is passed through the outside of one side of the connecting kit 121 and is rotatably connected to the connecting kit 121 through a bearing. The bottom of the movable head 141 is fixedly connected to a transmission rod 142, which extends horizontally outward on the movable head 141, and the end of the transmission rod 142 away from the movable head 141 is rotationally connected or fixedly connected to one of the cables 131 through a rotating axis. The top of the movable head 141 is rotatably connected to the direction pull rod 143, and the direction pull rod 143 can rotate vertically relative to the movable head 141, and the direction pull rod 143 can drive the movable head 141 to rotate in place relative to the connecting kit 121, wherein the direction pull rod 143 is a retractable structural design, which is a common structure and will not be described here.

[0041] It should be pointed out that the two ends of the transmission rod 142 can also be connected to the corresponding cables 131 respectively, and the direction pull rod 143 can be circular or elliptical. In this embodiment, an elliptical shape is preferably adopted because the folding trailers on the market are all elliptical, and the production chain of the product has been formed, which can reduce production costs.

[0042] Furthermore, a reinforcement member 144 is embedded in one end of the direction pull rod 143 connected to the movable head 141, and the reinforcement member 144 is rotatably connected to the movable head 141;

[0043] Specifically, in this embodiment, the direction pull rod 143 adopts an elliptical shape, and the bottom of the direction pull rod 143 is rotatably connected to the movable head 141. In order to improve the strength of the direction pull rod 143 during use, a reinforcement 144 is embedded in the bottom of the direction pull rod 143. The reinforcement 144 is rotatably connected to the movable head 141. The direction pull rod 143 is rotatably connected to the movable head 141 through the reinforcement 144, thereby improving the strength of the connection and improving the service life.

[0044] Furthermore, a sleeve 145 is provided on the outer side of the direction pull rod 143. The outer circle of the sleeve 145 is circular. A clamp 101 is provided in the middle of the end of the folding body 10 corresponding to the pull rod assembly 14. The clamp 101 is adapted to the sleeve 145.

[0045] Specifically, in order to facilitate the direction pull rod 143 to be fixed on the folding body 10 when not in use, the folding body 10 is provided with a clamp 101 installed in the middle of one end of the pull rod assembly 14. The clamp 101 is semicircular in shape and is made of plastic material. While having a certain strength, it also has a certain toughness, which is convenient for the direction pull rod 143 to be placed. Since the direction pull rod 143 is elliptical and the clamp 101 is semicircular, the direction pull rod 143 is easy to rotate in the clamp 101 when the angle is greater than 45 degrees. In order to detach from the clamp 101, a sleeve 145 adapted to the clamp 101 is fixedly provided on the outer side of the direction pull rod 143. The outer circle of the sleeve 145 is circular. When the direction pull rod 143 rotates, the sleeve 145 rotates accordingly. The sleeve 145 is round and will be restricted by the clamp 101 no matter how much it rotates. It can effectively prevent the direction pull rod 143 from detaching from the clamp 101 during rotation. The length of the sleeve 145 is determined by the rising height of the direction pull rod 143 relative to the folding body 10 when the folding body 10 is folded.

[0046] It should be noted that if the direction rod 143 is circular, the sleeve 145 is not required.

[0047] Furthermore, the rotation axis of the steering rod 143 and the rotation axis of the wheel 11 at the same end are located on the same straight line;

[0048] Specifically, the rotation axis of the steering rod 143 and the rotation axis of the wheel 11 are located on the same straight line because, in this embodiment, the transmission rod 142 is connected to only one of the cables 131, and no slide groove is provided on the transmission rod 142. Under this condition, the rotation axes of the three are located on the same straight line, which enables the steering rod 143 to rotate smoothly and without hindrance. Otherwise, a slide groove needs to be provided on the transmission rod 142 so that the connection between the transmission rod 142 and the cable 131 can change its relative position relative to the transmission rod 142 when the transmission rod 142 rotates.

[0049] It should be noted that when both ends of the transmission rod 142 are respectively connected to the corresponding cables 131, the three do not need to be in the same straight line, but the requirement of forming a parallelogram between the two wheel swing arms 111 and the transmission rod 142 must be met.

[0050] Furthermore, the cable 131 is a flexible structural member; specifically, in the present embodiment, the cable 131 is preferably a flexible structural member, such as a steel wire rope, a braided rope, etc., which has a deformable property. When the folding body 10 is folded, the two wheels 11 are close to each other, so that the steel wire rope loses its pull and is deformed under gravity, which will not affect the folding of the folding body 10.

[0051] It should be pointed out that since the transmission rod 142 is connected to one of the cables 131, when folded, the cable 131 connected to the transmission rod 142 will not fall down, but the other cable 131 is not connected to the pull rod assembly 14, so it will fall down when folded, affecting its use. For this reason, a pull rope (not shown in the figure) that is slidably connected to the cable 131 can be set on the rotating rod, so that the transmission rod 142 can lift the cable 131 through the pull rope when folded.

[0052] Furthermore, in this embodiment, the folding vehicle body 10 is further provided with a controller (not shown in the figure) and a power source (not shown in the figure) electrically connected to the controller, and the wheel 11 at at least one end is a powered wheel and is electrically connected to the controller;

[0053] Specifically, in order to make the use of the folding trailer more labor-saving, the hand-pulled trailer can be set as an electric power-assisted trailer. It is only necessary to set a controller and a power supply on the folding body 10, and the power supply is electrically connected to the controller. At the same time, at least two wheels 11 at one end are replaced with power wheels with hub motors inside. The power wheels can refer to the power wheels of electric bicycles or electric wheelchairs. The power wheels are electrically connected to the controller and driven by the controller; at the same time, control buttons for controlling speed and start and stop (not shown in the figure) can be set on the direction pull rod 143, and the control buttons are also electrically connected to the controller, thereby realizing electric power assistance.

[0054] It should be pointed out that the circuit control adopts existing conventional technology, and reference may be made to the control of electric bicycles, so it will not be described in detail here.

[0055] Furthermore, the folding vehicle body 10 is provided with an electric steering device 15 at one end where the power wheel is located, and the electric steering device 15 is connected to the corresponding wheel 11 through a connecting piece;

[0056] Specifically, in order to realize the remote control function, an electronic steering device 15 can also be installed at the end of the folding body 10 where the power wheel is located. The output end of the electronic steering device 15 can make left and right swing movements. The output end of the electronic steering device 15 can be selectively connected to the middle part of one of the cables 131 or to the wheel swing arm 111 of one of the power wheels. The electronic steering device 15 is also electrically connected to the controller, and the controller can receive external control signals to control the operation of the electronic steering device 15 to achieve the remote control effect.

[0057] To sum up, the present invention sets a symmetrical folding rod 12 at the end of the folding body 10, supports the pull rod assembly 14 through the folding rod 12, realizes the connection of the steering assembly 13 between the pull rod assembly 14 and the wheel 11, and can control the movement of the steering assembly 13, thereby controlling the steering of the wheel 11. The structural design is reasonable, the structure is simple, and the operation is convenient. At the same time, through the setting of the steering assembly 13, the wheel 11 can directly adopt a straight fork universal wheel, making the use of the folding trailer safer and the driving more stable. The steering assembly 13 adopts a flexible structural part, which does not affect the folding of the folding body 10, and the cost is also low, and it has a large market application prospect.

[0058] The present invention is not limited to what is described in the specification and implementation modes, and therefore additional advantages and modifications can be easily realized by those skilled in the art. Therefore, without departing from the spirit and scope of the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details, representative devices, and illustrated examples shown and described herein.

Claims

1. A folding trailer flexible steering system, characterized in that: include: A folding body, the folding body is of a gathering type, wheels are respectively provided at both ends of the bottom of the folding body, a steering assembly is also provided at the bottom of the folding body, the steering assembly is connected to the wheel at least at one end, the steering assembly is used to drive the connected wheel to turn, folding rods are rotatably connected on both sides of at least one end of the folding body, a pull rod assembly is also provided at at least one end of the folding body, the adjacent ends of the two folding rods are respectively rotatably connected to the pull rod assemblies, and the bottom of the pull rod assembly is also connected to the steering assembly.

2. The folding trailer flexible steering system according to claim 1, characterized in that: There are two wheels at each end, the steering assembly is located between the two wheels at the same end, and the front and rear ends of each wheel at the same end as the steering assembly are respectively provided with wheel swing arms, and each end of the steering assembly is rotatably connected to the two wheel swing arms at the corresponding end.

3. The folding trailer flexible steering system according to claim 2, characterized in that: The steering assembly comprises: a cable, wherein two cables are provided, and both ends of each cable are rotatably connected to the two wheel swing arms at the same end, and the bottom of the pull rod assembly is rotatably connected to at least one of the cables.

4. The folding trailer flexible steering system according to claim 1, characterized in that: The adjacent ends of the two folding rods are respectively embedded with synchronous teeth, the two synchronous teeth are meshed with each other, the adjacent ends of the two folding rods are connected together through a connecting sleeve, and the bottom of the pull rod assembly is rotatably connected to the connecting sleeve.

5. The folding trailer flexible steering system according to claim 4, characterized in that: The pull rod assembly includes: a movable head, which is located at the side of the connecting kit and is rotatably connected to the connecting kit, a transmission rod is fixedly provided at the bottom of the movable head, and one end of the transmission rod away from the movable head is rotatably connected to the steering assembly, and the top of the movable head is rotatably connected to a direction pull rod, and the direction pull rod is telescopically arranged.

6. The folding trailer flexible steering system according to claim 5, characterized in that: A reinforcing piece is embedded in one end of the direction pull rod connected to the movable head, and the reinforcing piece is rotatably connected to the movable head.

7. The folding trailer flexible steering system according to claim 5, characterized in that: A sleeve is also provided on the outer side of the direction pull rod, and the outer circle of the sleeve is circular. A clamp is also provided at the middle part of one end of the folding body corresponding to the pull rod assembly, and the clamp is adapted to the sleeve.

8. The folding trailer flexible steering system according to claim 5, characterized in that: The rotation axis of the steering rod and the rotation axis of the wheel at the same end are located on the same straight line.

9. The folding trailer flexible steering system according to claim 3, characterized in that: The cable is a flexible structural member.

10. The folding trailer flexible steering system according to claim 1, characterized in that: The folding vehicle body is also provided with a controller and a power source electrically connected to the controller, and the wheel at at least one end is a power wheel and is electrically connected to the controller.

11. The folding trailer flexible steering system according to claim 10, characterized in that: The folding vehicle body is provided with an electric steering device at one end where the power wheel is located, and the electric steering device is connected to the corresponding wheel through a connecting piece.

12. The folding trailer flexible steering system according to claim 1, characterized in that: The foldable vehicle body comprises: a plurality of foldable side bracket assemblies, wherein the plurality of side bracket assemblies are enclosed to form a frame with upper and lower openings, and a foldable bottom bracket is connected to the bottom of the frame.

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