Folding cart belt steering system

Abstract

A folding cart belt steering system, comprising: a folding cart body (10). Wheels (101) are provided at the bottom of the folding cart body (10). A steering assembly (12) is further provided at the bottom of the folding cart body (10). Folding rods (14) are respectively rotatably connected to two sides of at least one end of the folding cart body (10). At least one end of the folding cart body (10) is further provided with a pull rod assembly (13). The adjacent ends of the two folding rods (14) are respectively connected to the pull rod assembly (13). The bottom of the pull rod assembly (13) is in transmission connection with the steering assembly (12). By providing symmetrical folding rods (14) at the end part of the folding cart body (10), the pull rod assembly (13) is supported by means of the folding rods (14), so that the pull rod assembly (13) is connected to the steering assembly (12) between the wheels (101), and can control the movement of the steering assembly (12). The structural design is reasonable and simple, and the operation is convenient. Also, by providing the steering assembly (12), the wheels (101) can be straight fork swivel casters, such that the folding cart is safer to use, the movement is more stable, and the control is precise. The functional expansion of the folding cart body (10) is facilitated, and the folding cart has large market application prospects.

Description

A folding trailer belt steering system Technical Field

[0001] The utility model relates to the technical field of trailers, in particular to a belt 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 rotate in the direction of the sliding force due to the influence of the sliding force. In order to avoid the trailer losing control of the direction, it can only rely on Manpower pulling in the opposite direction brings inconvenience to use, and trailers are usually used outdoors. When the road surface is rough, the free movement characteristics of the oblique fork universal wheel will cause the oblique fork universal wheel to turn on its own when squeezed by the uneven road surface. Although the oblique fork universal wheel can be straightened by increasing the forward force, the oblique fork universal wheel is in an oblique swing 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 various resistances, which is even more so under heavy load conditions, greatly affecting the user experience of the trailer. In addition, the free steering of the oblique fork universal wheel limits the scalability of the folding trailer and affects the development of the folding trailer.

[0004] Therefore, it is urgent to design a folding trailer belt 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 folding trailer belt steering system, characterized in that it includes: a folding body, the folding body is a gathering type body, wheels are respectively provided at both ends of the bottom of the folding body, and at least one end is provided with two of the wheels, the bottom of the folding body is also provided with a steering assembly, folding rods are rotatably connected on both sides of at least one end of the folding body, and a pull rod assembly is also provided at at least one end of the folding body, and the adjacent ends of the two folding rods are respectively rotatably connected to the pull rod assembly, the steering assembly includes at least one transmission belt, the transmission belt is located at one end where the two wheels are provided, and the two ends of the transmission belt are respectively connected to the two wheels for transmission, and the bottom of the pull rod assembly is located in the transmission belt and is connected to the transmission belt for transmission.

[0006] In a preferred embodiment, the rotating shaft of each wheel connected to the transmission belt is provided with gear teeth, and the transmission belt is adapted to the gear teeth.

[0007] In a preferred embodiment, the position where the wheel is provided on the folding vehicle body is further provided with a limiting post, and the limiting post corresponds to the position of the gear teeth and is used to prevent the transmission belt from disengaging from the gear teeth.

[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 tooth is provided at the bottom of the movable head, and the transmission tooth is adapted to the transmission belt, 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, a stop column for preventing the transmission belt from disengaging from the transmission teeth is provided on the bottom surface of the connection kit.

[0013] 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.

[0014] 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.

[0015] In a preferred embodiment, the foldable vehicle body comprises: a plurality of foldable side support assemblies, wherein the plurality of side support assemblies are enclosed to form a frame with upper and lower openings, and a foldable bottom support is connected to the bottom of the frame.

[0016] 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, simple, and easy to operate. At the same time, through the setting of the steering assembly, the wheels can directly adopt straight fork universal wheels, making the folding trailer safer to use, more stable to drive, and accurately controlled, which is conducive to the functional expansion of the folding body and has a large market application prospect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural diagram of the present invention;

[0018] Figure 2 is a schematic diagram of the connection of the transmission belt of the utility model;

[0019] Figure 3 is a cross-sectional view of the folding rod of the present invention;

[0020] Figure 4 is a schematic structural diagram of the wheel of the present invention;

[0021] FIG5 is an exploded view of the pull rod assembly of the present invention;

[0022] FIG6 is a schematic diagram of the present invention in a folded state.

[0023] In the picture:

[0024] 10. Folding body; 101. Wheel; 102. Gear teeth; 103. Limiting column; 11. Clamp; 12. Steering assembly; 121. Drive belt; 13. Pull rod assembly; 131. Movable head; 132. Drive gear; 133. Steering rod; 134. Reinforcement member; 135. Sleeve; 14. Folding rod; 141. Synchronous gear; 142. Connecting kit; 143. Avoidance groove; 144. Stop column; 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 6, the present invention provides a flexible steering system for a foldable trailer, characterized in that it includes: a foldable body 10, the foldable body 10 is a gathered body, wheels 101 are respectively provided at both ends of the bottom of the foldable body 10, and at least one end is provided with two of the wheels 101, the bottom of the foldable body 10 is also provided with a steering assembly 12, folding rods 14 are rotatably connected to both sides of at least one end of the foldable body 10, and a pull rod assembly 13 is further provided at at least one end of the foldable body 10, and adjacent ends of the two folding rods 14 are respectively rotatably connected to the pull rod assembly 13, the steering assembly 12 includes at least one transmission belt 121, the transmission belt 121 is located at one end where the two wheels 101 are provided, and the two ends of the transmission belt 121 are respectively transmission-connected to the two wheels 101, and the bottom of the pull rod assembly 13 is located inside the transmission belt 121 and transmission-connected to the transmission belt 121;

[0031] Specifically, the folding vehicle body 10 is a gathering type vehicle body. The gathering type folding vehicle body 10 is a rectangular frame formed by foldable brackets in the front, rear, left and right directions. The bottom surface of the frame is also provided with foldable brackets. When folded, the brackets on the middle bottom surface are arched upward, and the front, rear, left and right sides are gathered and folded toward the middle. This type of vehicle body is smaller in size after folding and is easier to carry. Therefore, this application preferably adopts a gathering type vehicle body. Although this application adopts a gathering type vehicle body, the structure of this application is also suitable for a folding type vehicle body, that is, a vehicle body with an arched middle and the front and rear ends close to the middle; wheels 101 are provided at both ends of the bottom of the folding vehicle body 10, and at least one end is provided with two wheels 101, and the two wheels 101 are arranged at intervals. In this embodiment, it is preferred that two wheels 101 are provided at both ends. The four wheels 101 have stronger stability and better anti-rollover performance. Preferably, a steering assembly 12 is further provided at the bottom of the folding body 10, and a folding rod 14 is provided at at least one of the two ends of the folding body 10. The folding rod 14 has two ends, and the two folding rods 14 are symmetrically arranged. The ends away from each other between the two folding rods 14 are respectively connected to the folding body 10 for rotation. The two folding rods 14 can be rotated vertically relative to the folding body 10 to adapt to the folding of the folding body 10, so as to avoid the folding body 10 being restricted by the folding rod 14 and unable to fold. A pull rod assembly is provided on at least one end of the folding body 10. 13, the pull rod assembly 13 is located at one end adjacent to the two folding rods 14 and is rotatably connected to the folding rods 14. When the folding rods 14 rotate relative to the folding body 10, the pull rod assembly 13 will be driven to rise or fall, wherein the pull rod assembly 13 can also rotate horizontally relative to the folding rods 14; the steering assembly 12 is composed of at least one transmission belt 121, the inner side of the transmission belt 121 has teeth, the two wheels 101 are connected together by the transmission belt 121, and the transmission belt 121 is in transmission connection with the wheels 101, and the bottom of the pull rod assembly 13 is located at In the middle part of the transmission belt 121, it is also connected to the transmission belt 121. When the pull rod assembly 13 rotates horizontally, it drives the transmission belt 121 to move, and the transmission belt 121 drives the two wheels 101 to rotate. It should be noted that the number of folding rods 14 and pull rod assemblies 13 may not be equal. When the folding rod 14 and the pull rod assembly 13 are only provided at one end of the folding body 10, the folding rod 14 and the pull rod assembly 13 need to be located at the same end. When the folding rod 14 is provided at both ends, the pull rod assembly 13 may be provided at only one end.

[0032] It should be pointed out that since the wheels 101 are connected together by the transmission belt 121, their rotation is affected by the movement of the transmission belt 121, that is, the wheel 101 will not rotate when the transmission belt 121 is not moving. Therefore, the wheel 101 can be set as a straight-fork universal wheel, which can be more stable than the oblique-fork universal wheel during driving. It cannot rotate freely and will only rotate when subjected to force in a specific direction, which can greatly improve the safety of use. In addition, under heavy load conditions, the steering of the straight-fork universal wheel is simpler, and the precise control method can bring additional functional expansion to the folding trailer, such as automation, manned and other functions.

[0033] Furthermore, the rotating shaft of each wheel 101 connected to the transmission belt 121 is provided with gear teeth 102, and the transmission belt 121 is adapted to the gear teeth 102;

[0034] Specifically, each wheel 101 connected to the transmission belt 121 is provided with gear teeth 102 on the rotating shaft, and the gear teeth 102 are adapted to the teeth on the rotating belt. When the transmission belt 121 is set on the wheel 101, the transmission belt 121 is engaged with the gear teeth 102, so that the transmission belt 121 can synchronously drive the wheel 101 to rotate when it moves.

[0035] Furthermore, a limiting post 103 is provided at the position where the wheel 101 is provided on the folding body 10. The limiting post 103 corresponds to the position of the gear teeth 102 and is used to prevent the transmission belt 121 from being separated from the gear teeth 102.

[0036] Specifically, since the folding body 10 is foldable, the two wheels 101 will move closer to each other when folded. At this time, the distance between the wheels 101 is shortened, while the circumference of the transmission belt 121 remains unchanged. At this time, the transmission belt 121 will disengage from the gear teeth 102 and fall off, affecting subsequent use. To avoid this situation, a limiting post 103 is provided on the bottom surface of the bracket connecting seat of the folding body 10 connecting the wheel 101. The position of the limiting post 103 corresponds to the gear teeth 102. When the wheel 101 is installed on the folding body 10, the limiting post 103 is located on the outside of the gear teeth 102, thereby preventing the transmission belt 121 from falling off through the blocking of the limiting post 103. The number of limiting posts 103 is two for each wheel 101, and the two limiting posts 103 are arranged opposite to each other, so that the transmission belt 121 is fixed on the gear teeth 102 in two directions, and will not disengage from the gear teeth 102 even when the folding body 10 is folded.

[0037] Furthermore, in this embodiment, adjacent ends of the two folding rods 14 are respectively embedded with synchronous teeth 141, and the two synchronous teeth 141 are engaged with each other. The adjacent ends of the two folding rods 14 are connected together through a connecting sleeve 142, and the bottom of the pull rod assembly 13 is rotatably connected to the connecting sleeve 142;

[0038] Specifically, since the two folding rods 14 are connected together by a connecting kit 142 and are not directly connected, the two folding rods 14 will have inconsistent rotation angles when they rotate, causing the pull rod assembly 13 connected to the connecting kit 142 to tilt, affecting normal use. For this reason, a synchronous tooth 141 is fixedly embedded at one adjacent end of the two folding rods 14, and the two synchronous teeth 141 are in a meshing state. Through the meshing of the two synchronous teeth 141, the two folding rods 14 are rotated synchronously, and the angles are also the same, thereby ensuring that the pull rod assembly 13 can always be in a vertical state. At the same time, after the two folding rods 14 are folded, the ends of the synchronous teeth 141 will contact the top wall of the connecting kit 142. In order to avoid the folding rod 14 from being unable to rotate due to the restriction of the connecting kit 142, a avoidance groove 143 is also provided on the top surface of the connecting kit 142. When the folding rod 14 rotates, the end of the synchronous tooth 141 will extend out of the connecting kit 142 through the avoidance groove 143.

[0039] Furthermore, the pull rod assembly 13 includes: a movable head 131, the movable head 131 is located on the side of the connecting kit 142 and is rotatably connected to the connecting kit 142, a transmission tooth 132 is provided at the bottom of the movable head 131, the transmission tooth 132 is transmission-connected to the transmission belt 121, and a direction pull rod 133 is rotatably connected to the top of the movable head 131, and the direction pull rod 133 is retractably arranged;

[0040] Specifically, the pull rod assembly 13 includes: a movable head 131, which is inserted into the outside of one side of the connecting kit 142 and is rotatably connected to the connecting kit 142 through a bearing. A transmission tooth 132 is provided at the bottom of the movable head 131, and the movable head 131 is connected to the transmission belt 121 through the transmission tooth 132. When the movable head 131 rotates, the transmission belt 121 is driven to move. The top of the movable head 131 is rotatably connected to the direction pull rod 133. The direction pull rod 133 can rotate vertically relative to the movable head 131, and the direction pull rod 133 can drive the movable head 131 to rotate in place relative to the connecting kit 142, wherein the direction pull rod 133 is a retractable structural design, which is a common structure and will not be described here.

[0041] It should be noted that the direction pull rod 133 can be circular or elliptical. In this embodiment, the elliptical shape is preferably adopted because the pull rods of folding trailers on the market are all elliptical, and the production chain of the product has been formed, which can reduce production costs.

[0042] Among them, the transmission belt 121 can also be set into two, the two transmission belts 121 are respectively connected to the two wheels 101, and the end of the transmission belt 121 away from the wheel 101 is respectively connected to the movable head 131, and the movable head 131 is provided with two transmission teeth 132 above and below for adapting to the two transmission belts 121.

[0043] Furthermore, a reinforcement member 134 is embedded in one end of the direction pull rod 133 connected to the movable head 131, and the reinforcement member 134 is rotatably connected to the movable head 131;

[0044] Specifically, in this embodiment, the direction pull rod 133 adopts an elliptical shape, and the bottom of the direction pull rod 133 is rotatably connected to the movable head 131. In order to improve the strength of the direction pull rod 133 during use, a reinforcement 134 is embedded in the bottom of the direction pull rod 133. The reinforcement 134 is rotatably connected to the movable head 131. The direction pull rod 133 is rotatably connected to the movable head 131 through the reinforcement 134, thereby improving the strength of the connection and improving the service life.

[0045] Furthermore, a sleeve 135 is provided on the outer side of the direction pull rod 133. The outer circle of the sleeve 135 is circular. A clamp 11 is provided in the middle of the end of the folding body 10 corresponding to the pull rod assembly 13. The clamp 11 is adapted to the sleeve 135.

[0046] Specifically, in order to facilitate the direction pull rod 133 to be fixed on the folding body 10 when not in use, the folding body 10 is provided with a clamp 11 installed in the middle of one end of the pull rod assembly 13. The clamp 11 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 133 to be placed. Since the direction pull rod 133 is elliptical and the clamp 11 is semicircular, the direction pull rod 133 is easy to rotate in the clamp 11 when the angle is greater than 45 degrees. In order to detach from the clamp 11, a sleeve 135 adapted to the clamp 11 is fixedly provided on the outside of the direction pull rod 133. The outer circle of the sleeve 135 is circular. When the direction pull rod 133 rotates, the sleeve 135 rotates accordingly. The sleeve 135 is round and will be restricted by the clamp 11 no matter how much it rotates. It can effectively prevent the direction pull rod 133 from detaching from the clamp 11 during rotation. The length of the sleeve 135 is determined by the rising height of the direction pull rod 133 relative to the folding body 10 when the folding body 10 is folded.

[0047] It should be noted that if the direction rod 133 is circular, the sleeve 135 is not required.

[0048] Furthermore, a stop post 144 is provided on the bottom surface of the connecting kit 142 for preventing the transmission belt 121 from being separated from the transmission teeth 132;

[0049] Specifically, when the folding body 10 is folded, the pull rod assembly 13 will be lifted up by the folding rod 14. At this time, the transmission belt 121 is not fixedly connected, so that the transmission belt 121 and the transmission teeth 132 will be separated, affecting subsequent use. In addition, during normal use, the transmission belt 121 is also prone to separation from the transmission teeth 132 due to shaking. To avoid this situation, a stop column 144 is provided on the bottom surface of the connecting kit 142. When the movable head 131 is installed on the connecting kit 142, the stop column 144 is located on the outer wall of the transmission teeth 132, thereby preventing the transmission belt 121 from separating from the transmission teeth 132. The number of the stop columns 144 is preferably two, which are located on both sides of the transmission belt 121, so that the transmission belt 121 is always in a meshing state with the transmission teeth 132.

[0050] Furthermore, in this embodiment, the two wheels 101 are connected to a controller and a power source electrically connected to the controller;

[0051] 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 connect the wheel 101 to the controller (not shown in the figure) and the power supply (not shown in the figure). The power supply is electrically connected to the controller so that the wheel 101 is driven by the controller; at the same time, a control button (not shown in the figure) for controlling the speed and start and stop can be set on the direction rod 133, and the control button is also electrically connected to the controller, so that electric power assistance can be achieved.

[0052] 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.

[0053] Furthermore, one of the support seats is provided with an electric steering device 15, and an output end of the electric steering device 1516 is rotationally connected to the wheel 101 through a connecting member, so as to control the rotation of the wheel 101;

[0054] Specifically, in order to realize the remote control function, an electronic steering device 15 can also be installed on one of the support seats. The output end of the electronic steering device 15 can make left and right swing movements. At the same time, one of the power wheels is provided with a wheel swing arm. The output end of the electronic steering device 15 is rotationally connected to the wheel swing arm, and the electronic steering device 15 is also electrically connected to the controller. The controller can receive external control signals to control the operation of the electronic steering device 15 and realize the remote control effect.

[0055] It should be noted that the electronically controlled steering device 15 may also be directly connected to the transmission belt 121 to control the steering of the wheel 101 .

[0056] To sum up, the present invention sets symmetrical folding rods at the ends of the folding body, supports the pull rod assembly through the folding rods, realizes the connection of the steering assembly between the pull rod assembly and the wheel, and can control the movement of the steering assembly, thereby controlling the steering of the wheel. The structural design is reasonable, simple, and easy to operate. 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, driving more stable, and precise control of direction, which is conducive to the functional expansion of the folding body and has a large market application prospect.

[0057] 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 belt steering system, characterized in that: include: A folding body, which is a gathering type body, with wheels respectively provided at both ends of the bottom of the folding body, and at least one end is provided with two of the wheels, a steering assembly is also provided at the bottom of the folding body, 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, and the adjacent ends of the two folding rods are respectively rotatably connected to the pull rod assembly, the steering assembly includes at least one transmission belt, the transmission belt is located at one end where the two wheels are provided, and the two ends of the transmission belt are respectively transmission-connected to the two wheels, and the bottom of the pull rod assembly is located inside the transmission belt and transmission-connected to the transmission belt.

2. The folding trailer belt steering system according to claim 1, characterized in that: The rotating shaft of each wheel connected to the transmission belt is provided with gear teeth, and the transmission belt is adapted to the gear teeth.

3. The folding trailer belt steering system according to claim 2, characterized in that: The position where the wheel is arranged on the folding vehicle body is also provided with a limiting column, and the limiting column corresponds to the position of the gear teeth and is used to prevent the transmission belt from being separated from the gear teeth.

4. The folding trailer belt 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 belt steering system according to claim 4, characterized in that: 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. The bottom of the movable head is provided with transmission teeth, which are adapted to the transmission belt. 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 belt 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 belt 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 belt steering system according to claim 5, characterized in that: The bottom surface of the connecting kit is provided with a stop column for preventing the transmission belt from being separated from the transmission teeth.

9. The folding trailer belt 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.

10. The folding trailer belt steering system according to claim 9, 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.

11. The folding trailer belt 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.

Images