Steering system of folding trailer

Abstract

The utility model discloses a folding trailer steering system which comprises a folding trailer body, wheels are arranged at the two ends of the bottom of the folding trailer body respectively, a steering assembly is further arranged at the bottom of one end of the folding trailer body, the steering assembly is connected with the wheel at at least one end, and the steering assembly is used for driving the connected wheel to steer. At least one end, provided with the steering assembly, of the folding vehicle body is further provided with a pull rod, the pull rod is connected with the steering assembly, and the pull rod drives the steering assembly to move horizontally through rotation. By means of the design, the steering assembly is arranged between the two wheels, steering of the wheels is controlled through the steering assembly, control is easy, convenient and practical, and the folding vehicle is convenient to use. By the adoption of the structure, the wheels can be replaced by the straight fork universal wheels, the running stability of the vehicle is improved, the use safety is high, steering is simpler, meanwhile, the steering assembly adopts a flexible structural part, the characteristic of deformation is utilized, a gathering type folding vehicle body is matched, and the cost is lower.

Description

Technical Field

[0001] The utility model relates to the technical field of trailers, in particular to a 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 simple use, ability to carry cargo, convenient storage, and time-saving and labor-saving properties. 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 for easy steering. Due to its structural design (the wheel axle 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 axle and the rotation axis are on the same vertical line). It will rotate according to the direction of force transmission, but at the same time, due to its free steering, it will be more difficult to control than the straight fork universal wheel, especially on a loaded and inclined uphill road. 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 avoid the trailer from losing control, it can only be pulled in the opposite direction by manpower, which brings inconvenience to 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 it is squeezed by the uneven road surface. Although the inclined fork universal wheel can be straightened by increasing the forward force at this time, the inclined fork universal wheel is in a slanting state due to the squeezing, plus the resistance of the uneven road surface, the force applied at this time needs to be greater than various resistances, especially under heavy load, which greatly affects the user experience of the trailer.

[0004] Therefore, it is urgent to design a folding trailer steering system to overcome the above-mentioned deficiencies of one or more prior arts. Utility Model Content

[0005] The technical solution adopted by the utility model to solve the above-mentioned technical problems is: a folding trailer steering system, characterized in that it includes: a folding body, wheels are respectively provided at both ends of the bottom of the folding body, a steering assembly is also provided at the bottom of one end of the folding body, the steering assembly is connected to the wheel at at least one end, the steering assembly is used to drive the connected wheel to steer, at least one end of the folding body provided with the steering assembly is also provided with a pull rod, the pull rod is connected to the steering assembly, and the pull rod drives the steering assembly to translate by rotating.

[0006] In a preferred embodiment, the folding body includes: a plurality of side bracket assemblies formed by two straight rods crossing in an "X" shape, at least one of the side bracket assemblies having a mounting platform mounted at its intersection, the side bracket assembly being rotatable within a predetermined angle relative to the mounting platform and the mounting platform not moving therewith, at least one of the mounting platforms being located at one end where the steering assembly is located, and the pull rod being detachably connected to the mounting platform.

[0007] In a preferred embodiment, a shaft sleeve is provided in the middle of the pull rod, the pull rod can rotate relative to the shaft sleeve, the shaft sleeve is detachably connected to the mounting platform, a folding structure is provided in the middle of the pull rod, the pull rod is bent by the folding structure, and the folding structure is located above the shaft sleeve.

[0008] 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.

[0009] In a preferred embodiment, the steering assembly includes: two followers, each of the followers is located between the two wheel swing arms at the same end of the two wheels, and the two ends of the follower are respectively rotatably connected to the corresponding wheel swing arms.

[0010] In a preferred embodiment, a transmission rod for connecting to the driven member is provided at the bottom of the pull rod, and the pull rod drives the driven member to translate through the transmission rod, and the driven member drives the wheel to rotate.

[0011] In a preferred embodiment, the rotation axis of the pull rod and the rotation axes of the two wheels are located on the same straight line.

[0012] In a preferred embodiment, the follower is a flexible structural member.

[0013] In a preferred embodiment, the mounting platform includes: an outer cover, a mounting seat, two opposite sides of the mounting seat are provided with avoidance grooves for the straight rod to rotate within a predetermined angle, the outer cover is detachably arranged on the two sides of the mounting seat with the avoidance grooves, the middle parts of the two outer covers are detachably connected to the middle parts of the corresponding straight rods, a mounting groove is arranged in the middle part of the mounting seat, a support rod is arranged in the mounting groove, one end of the support rod passes through the mounting seat, and a sliding groove is arranged at the end of the support rod passing through the mounting seat, the positions of the two straight rods located in the mounting platform are respectively rotatably provided with connecting rods, and the two connecting rods are connected together by a pin shaft away from the end connected to the straight rod, and the pin shaft is located in the sliding groove and slidably cooperates with the sliding groove.

[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 is electrically connected to the controller.

[0015] In a preferred embodiment, the folding vehicle body is provided with an electric steering device on the side where the power wheel is located, and the electric steering device is connected to the corresponding wheel through a connecting rod.

[0016] In the second embodiment, two transmission rods for connecting with the driven members are provided at the bottom of the pull rod, and the two transmission rods are rotationally connected with the two driven members respectively. The pull rod drives the driven members to translate through the transmission rods, and the driven members drive the wheels to rotate.

[0017] The beneficial effects of the utility model are as follows: by arranging a steering assembly between the two wheels, the steering of the wheels is controlled by the steering assembly, the control is simple, convenient and practical, and by adopting this structure, the wheels can be replaced with straight-forked universal wheels, the driving stability of the vehicle is improved, the use safety is high, and the steering is also simpler. At the same time, the steering assembly adopts a flexible structural part and utilizes the deformable characteristics to adapt to the gathered folding body, which is lower in cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the utility model;

[0019] Figure 2 This is a schematic diagram of the coordination between the steering assembly and the wheel of the utility model;

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

[0021] Figure 4 This is an exploded view of the mounting platform of the utility model;

[0022] Figure 5 This is a schematic structural diagram of the second embodiment of the utility model;

[0023] Figure 6 It is a folding schematic diagram of the second embodiment of the utility model.

[0024] In the figure:

[0025] 10. Folding body; 11. Side bracket assembly; 12. Mounting platform; 121. Outer cover; 122. Mounting seat; 123. Avoidance groove; 124. Mounting groove; 125. Support rod; 126. Slide groove; 127. Connecting rod; 128. Pin shaft; 13. Pull rod; 14. Bushing; 15. Transmission rod; 16. Wheel; 17. Wheel swing arm;

[0026] 20. Steering assembly; 21. Follower;

[0027] 30. Electronic steering device. DETAILED DESCRIPTION

[0028] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0029] In the description of the embodiments of the present utility model, 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, "connection" can be a direct connection or an indirect connection through an intermediate medium. Among them, "fixed" means that they are connected to each other and the relative position relationship after connection remains unchanged. The directional terms mentioned in the embodiments of the present utility model, 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 utility model, 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 utility model.

[0030] In the embodiments of the present invention, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0031] In the embodiment of the present invention, "and / or" is only a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0032] References to "one embodiment" or "some embodiments" etc. described in this specification mean that one or more embodiments of the utility model include specific features, structures or characteristics described in conjunction with the embodiment. Therefore, the statements "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. that appear in different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways. Therefore, the utility model is not limited to the specific embodiments disclosed below.

[0033] like Figure 1-Figure 4 As shown, the utility model provides a folding trailer steering system, comprising: a folding body 10, wherein wheels 16 are respectively arranged at both ends of the bottom of the folding body 10, a steering assembly 20 is also arranged at the bottom of one end of the folding body 10, the steering assembly 20 is connected to the wheel 16 at at least one end, and the steering assembly 20 is used to drive the connected wheel 16 to steer, and at least one end of the folding body 10 provided with the steering assembly 20 is also provided with a pull rod 13, the pull rod 13 is connected to the steering assembly 20, and the pull rod 13 drives the steering assembly 20 to translate by rotating;

[0034] Specifically, the folding body 10 can be a folding body or a gathering body. The folding action of the folding body is that the middle part is arched upward, and the front and rear ends are folded together towards the middle. The gathering type also has the middle part arched upward, but it is folded together towards the middle from four directions: front, back, left and right. Because the gathered type body occupies less space after folding than the folding type, the gathering type body is preferably used in this embodiment. Wheels 16 are connected to the two ends of the bottom of the folding body 10, respectively. The wheels 16 can be conventional wheels 16 without power output or power wheels with power output, such as the power wheels of electric bicycles, the power wheels of electric wheelchairs, etc.; and the wheels 16 can all be power wheels or only the wheels 16 at one end can be power wheels, which can be determined according to actual usage requirements. A steering assembly 20 is also provided at the bottom of the folding body 10, and the steering assembly 20 is at least connected to the wheel 16 at one end. The steering assembly 20 is connected to the wheels 16 at both ends, which means that the wheels 16 at each end are connected to the steering assembly 20; at least one end of the folding body 10 having the steering assembly 20 is also provided with a pull rod 13, and the bottom of the pull rod 13 is connected to the corresponding steering assembly 20, which is convenient for towing the folding body 10 while controlling the movement of the steering assembly 20 by rotating the pull rod 13, thereby driving the wheel 16 to turn and realize the control direction. The number of pull rods 13 corresponds to the number of steering assemblies 20; it should be pointed out that the wheel 16 is a straight fork universal wheel, which is more stable than the oblique fork universal wheel during driving and cannot rotate freely. It will only rotate when subjected to force in a specific direction, thereby improving the safety of use. Moreover, under heavy load conditions, the steering of the straight fork universal wheel is simpler.

[0035] Furthermore, the folding vehicle body 10 comprises: a plurality of side bracket assemblies 11 formed by two straight rods (not shown) crossing in an "X" shape, at least one of the side bracket assemblies 11 having a mounting platform 12 sleeved at the intersection thereof, the side bracket assemblies 11 being rotatable within a predetermined angle relative to the mounting platform 12 and the mounting platform 12 not moving with the side bracket assemblies, at least one of the mounting platforms 12 being located at one end where the steering assembly 20 is located, and the pull rod 13 being detachably connected to the mounting platform 12;

[0036] Specifically, the front, back, left, and right sides of the folding body 10 each have at least one "X"-shaped side bracket assembly 11, and the two straight rods are rotatably connected at the intersection so that the two straight rods can rotate relative to each other at the intersection, which facilitates folding while also having a strong supporting force to improve the strength of the body. A mounting platform 12 is sleeved at the intersection of the side bracket assemblies 11, and the mounting platform 12 is used to hang objects, such as a hanging basket, to increase the load capacity of the trailer. When the side bracket assembly 11 is rotated, folded or unfolded, the mounting platform 12 can always remain in a vertical state to prevent the objects hung thereon from tilting or falling; the folding body 10 is provided with at least one side bracket assembly 11 at one end of the steering assembly 20, and the side bracket assembly 11 is provided with a mounting platform 12, and the pull rod 13 is detachably connected to the mounting platform 12, and is fixed to the end of the folding body 10 through the mounting platform 12, and is always in a vertical state.

[0037] Further, a sleeve 14 is sleeved in the middle of the pull rod 13, the pull rod 13 can rotate relative to the sleeve 14, the sleeve 14 is detachably connected to the mounting platform 12, a folding structure (not shown in the figure) is provided in the middle of the pull rod 13, the pull rod 13 is bent by the folding structure, and the folding structure is located above the sleeve 14;

[0038] Specifically, a shaft sleeve 14 is provided in the middle of the pull rod 13, and the pull rod 13 can rotate horizontally relative to the shaft sleeve 14. The shaft sleeve 14 is detachably connected to the mounting platform 12. The pull rod 13 is fixed to the mounting platform 12 through the shaft sleeve 14. The bottom of the pull rod 13 is connected to the steering assembly 20. At the same time, a folding structure is also provided in the middle of the pull rod 13. The folding structure is used to enable the pull rod 13 to be rotated and bent in the vertical direction to facilitate towing the trailer. It should be pointed out that the folding structure needs to be above the shaft sleeve 14 to avoid being restricted by the shaft sleeve 14 and being unable to fold.

[0039] Furthermore, two wheels 16 are provided at each end, the steering assembly 20 is located between the two wheels 16 at the same end, and the front and rear ends of each wheel 16 at the same end as the steering assembly 20 are provided with wheel swing arms 17, respectively, and each end of the steering assembly 20 is rotatably connected to the two wheel swing arms 17 at the corresponding end;

[0040] Specifically, there are two wheels 16 at each end, and the two wheels 16 are arranged at an interval. The steering assembly 20 is arranged between the two wheels 16 at the same end. The front end and the rear end of each wheel 16 connected to the steering assembly 20 are respectively provided with wheel swing arms 17. The wheel swing arms 17 at the same end of the two wheels 16 are connected together through the steering assembly 20. When one of the wheels 16 rotates, the other wheel 16 is driven to rotate synchronously in the same direction through the steering assembly 20. The wheel swing arm 17 and the steering assembly 20 are rotatably connected, so that the angle between the wheel swing arm 17 and the steering assembly 20 can be changed to achieve the steering effect.

[0041] Furthermore, the steering assembly 20 includes: two followers 21, each of the followers 21 is respectively located between the two wheel swing arms 17 at the same end of the two wheels 16, and the two ends of the follower 21 are respectively rotatably connected to the corresponding wheel swing arms 17;

[0042] Specifically, the steering assembly 20 includes two followers 21, and the two ends of each follower 21 are rotatably connected to the wheel swing arms 17 at the same end of the two wheels 16. When one of the wheels 16 rotates, one of its wheel swing arms 17 will push the follower 21, and the other wheel swing arm 17 will pull the follower 21. The pulled follower 21 will pull the other wheel 16 to rotate, and the other wheel swing arm 17 of the other wheel 16 will pull the pushed follower 21 to achieve synchronous rotation in the same direction. It should be pointed out that the two wheel swing arms 17 of each wheel 16 are located on the same straight line and have the same length, so that a rectangle with equal opposite sides is formed between the two wheel swing arms 17 and the two followers 21.

[0043] Furthermore, a transmission rod 15 for connecting with the driven member 21 is provided at the bottom of the pull rod 13, and the pull rod 13 drives the driven member 21 to translate through the transmission rod 15, and the driven member 21 drives the wheel 16 to rotate;

[0044] Specifically, since it is inconvenient to directly drive the wheel 16 to rotate, a transmission rod 15 is fixedly connected to the bottom of the pull rod 13. The end of the transmission rod 15 away from the pull rod 13 is rotatably connected to a rotating shaft. The transmission rod 15 is fixedly connected to a follower 21 through the rotating shaft. When the pull rod 13 rotates, it drives the end of the transmission rod 15 with the rotating shaft to swing left and right. The left and right swinging of the transmission rod 15 will push or pull the follower 21. The follower 21 drives one of the wheels 16 to rotate left and right, and the wheel 16 drives the other wheel 16 to rotate synchronously through the follower 21.

[0045] Furthermore, the rotation axis of the pull rod 13 and the rotation axis of the two wheels 16 are located on the same straight line. Specifically, because the movement trajectory of the transmission rod 15 is arc-shaped, in order to enable the transmission rod 15 to smoothly drive the transmission member connected thereto to translate, the rotation axis of the pull rod 13 and the rotation axis of the two wheels 16 are located on the same straight line. In this case, there is no need to open a slide groove 126 on the transmission rod 15, and it can also ensure that the transmission rod 15 can swing smoothly. It should be pointed out that the distance from the rotating shaft of the transmission rod 15 to the rotation axis of the pull rod 13 is equal to the distance from the wheel swing arm 17 to the rotation axis of the wheel 16.

[0046] Furthermore, the follower 21 is a flexible structural member. Specifically, the follower 21 is preferably a flexible structural member, such as a steel wire rope, a braided rope, etc., which uses its deformable characteristics to adapt to the width change of the folding body 10 when it is folded. Since the pull rod 13 is connected to the mounting platform 12, and the mounting platform 12 is connected to the side bracket assembly 11, the up and down movement amplitude of the pull rod 13 is equal to the movement amplitude at the intersection of the side bracket assembly 11, and the movement amplitude at the intersection of the side bracket assembly 11 is smaller than the width between its two sides. Therefore, the deformation of the follower 21 can adapt to the folding of the folding body 10, so that the folding body 10 can be completely folded up.

[0047] Furthermore, in this embodiment, the mounting platform 12 includes: an outer cover 121, a mounting seat 122, and the two opposite sides of the mounting seat 122 are provided with avoidance grooves 123 for the straight rod to rotate within a predetermined angle. The outer cover 121 is detachably arranged on the two sides of the mounting seat 122 with the avoidance grooves 123, and the middle parts of the two outer covers 121 are detachably connected to the middle parts of the corresponding straight rods, and the middle part of the mounting seat 122 is provided with a mounting groove 124. A support rod 125 is provided in the mounting groove 124, one end of the support rod 125 passes through the mounting seat 122, and a slide groove 126 is provided at one end of the support rod 125 passing through the mounting seat 122. Two straight rods are located in the mounting platform 12 and are respectively rotatably provided with connecting rods 127. The two connecting rods 127 are connected together by a pin shaft 128 at one end away from the connection with the straight rod. The pin shaft 128 is located in the slide groove 126 and slidably cooperates with the slide groove 126.

[0048] Specifically, each mounting platform 12 includes two outer covers 121 and a mounting seat 122. The mounting seat 122 is arranged between the two straight rods and located at the intersection of the two straight rods. A recessed avoidance groove 123 is provided on the two opposite sides of the mounting seat 122. The straight rod is located in the avoidance groove 123. The function of the avoidance groove 123 is to allow the straight rod to rotate on the mounting seat 122 to avoid affecting the folding of the vehicle body. The outer covers 121 are arranged on both sides of the mounting seat 122 to cover the straight rod in the mounting seat 122. The middle of the outer cover 121 is aligned with the middle of the corresponding straight rod. The two outer covers 121 are connected together by screws and are fixedly connected to the mounting seat 122, wherein two connection holes are reserved on both sides of the outer cover 121 for connecting items such as a hanging basket; in order to prevent the mounting seat 122 from rotating with the straight rod when the mounting seat 122 rotates, a mounting groove 124 is provided in the middle of the mounting seat 122, and a support rod 125 is provided in the mounting groove 124, and the support rod 125 is adapted to the mounting groove 124, one end of the support rod 125 extends out of the mounting seat 122, and a slide groove 126 is provided on the end extending out of the mounting seat 122, and the support rod 125 is provided with a support groove 126. The other end can be fixedly connected to the mounting seat 122 or connected to the intersection of the two straight rods. It should be pointed out that the support rod 125 must be vertical on the mounting seat 122, and the vertical shape can keep the mounting platform 12 always in a vertical state; the two straight rods are located within the range of the mounting platform 12 and are respectively rotatably provided with a connecting rod 127, and the end of the connecting rod 127 away from the straight rod is connected together by a pin shaft 128, and the pin shaft 128 is slidably matched with the slide groove 126, and the two connecting rods 127 are of equal length. When the straight rod rotates, it will push the connecting rod 127 to move. At this time, The ends of the two connecting rods 127 are connected together by a pin 128, and the pin 128 can slide in the slide groove 126. At this time, the rotation of the straight rod will push the pin 128 to slide in the slide groove 126. At the same time, since the lengths of the two connecting rods 127 are equal and the rotations of the two straight rods are synchronous, the forces are also equal. Therefore, the pin 128 will limit the support rod 125 to be in a vertical state, and the vertical state of the support rod 125 will limit the mounting seat 122 to be in a vertical state, so that the objects connected to the mounting platform 12 are always in a vertical state.

[0049] Furthermore, the folding vehicle body 10 is also 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 16 at at least one end is a power wheel and is electrically connected to the controller;

[0050] Specifically, in order to achieve the effect of electric power assistance, a controller and a power supply can be set on the folding body 10, and the power supply is electrically connected to the controller, wherein the front wheel 16 or the rear wheel 16 or the wheels 16 at both ends are powered wheels with motors, and the wheels 16 serving as motor wheels are electrically connected to the controller respectively. The controller can be controlled by setting a control button at the pull rod 13 or by remote control, wherein the controller and the power supply can be mounted on the mounting platform 12.

[0051] Furthermore, the folding vehicle body 10 is provided with an electric steering device 30 on the side where the power wheel is located, and the electric steering device 30 is connected to the corresponding wheel 16 through a connecting rod;

[0052] Specifically, when remote control is adopted, in order to realize remote control steering, an electric steering device 30 is provided on the side of the folding body 10 where the power wheel is provided. The electric steering device 30 is preferably an electric motor with a reduction gearbox, and its output end has a steering swing arm, which is rotatably connected to the wheel swing arm 17 through a connecting rod, so that when the steering swing arm moves, the wheel 16 connected thereto is driven to rotate through the connecting rod, and the wheel 16 drives another wheel 16 to move synchronously through the follower 21, thereby realizing remote control steering.

[0053] The second embodiment, as Figure 5-Figure 6 As shown, in this embodiment, two transmission rods 15 for connecting with the driven member 21 are provided at the bottom of the pull rod 13, and the two transmission rods 15 are respectively rotatably connected with the two driven members 21. The pull rod 13 drives the driven member 21 to translate through the transmission rods 15, and the driven member 21 drives the wheel 16 to rotate;

[0054] Specifically, the difference between the second embodiment and the first embodiment is that the first embodiment has one transmission rod 15, while the second embodiment has two transmission rods 15. In addition, in the first embodiment, the rotation center of the pull rod 13 needs to be on the same straight line as the rotation center of the wheels 16 on both sides, but this is not necessary in the second embodiment. Figure 5 The figure shows one of the implementations of the second embodiment, and the other is that the wheels 16 on both sides are directly below the vertical rods on both sides. At this time, since the pull rod 13 is staggered with the vertical rods on both sides, the two followers 21 will be restricted by the transmission rod 15 and no longer be in a straight line, but in a "V" shape with the middle arched outward from the folding body. In this state, it should be pointed out that the distance from the end of the two transmission rods 15 to the rotation axis is equal to the distance from the wheel swing arm 17 to the wheel rotation axis, so as to ensure that the pull rod 13 can rotate smoothly.

[0055] In summary, the utility model sets a steering assembly 20 between the two wheels 16, and controls the steering of the wheels 16 through the steering assembly 20. The control is simple, convenient and practical. By adopting this structure, the wheels 16 can be replaced with straight-forked universal wheels, which improves the driving stability of the vehicle, has high safety in use, and makes steering easier. At the same time, the steering assembly 20 adopts a flexible structural part and utilizes the deformable characteristics to adapt to the gathered folding body 10, which is lower in cost.

[0056] 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 familiar with 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 illustrative examples shown and described herein.

Claims

1. A folding trailer steering system, characterized in that: include: A folding body, wherein wheels are respectively provided at both ends of the bottom of the folding body, a steering assembly is also provided at the bottom of one end of the folding body, the steering assembly is connected to the wheel at at least one end, the steering assembly is used to drive the connected wheel to steer, and at least one end of the folding body provided with the steering assembly is also provided with a pull rod, the pull rod is connected to the steering assembly, and the pull rod drives the steering assembly to translate by rotating.

2. The folding trailer steering system according to claim 1, characterized in that: The folding vehicle body includes: a plurality of side bracket assemblies formed by two straight rods crossing in an "X" shape, at least one of the side bracket assemblies having a mounting platform mounted at its intersection, the side bracket assembly being rotatable within a predetermined angle relative to the mounting platform and the mounting platform not moving therewith, at least one of the mounting platforms being located at one end where the steering assembly is located, and the pull rod being detachably connected to the mounting platform.

3. The folding trailer steering system according to claim 2, characterized in that: The middle part of the pull rod is provided with a shaft sleeve, the pull rod can rotate relative to the shaft sleeve, the shaft sleeve is detachably connected to the mounting platform, the middle part of the pull rod is provided with a folding structure, the pull rod is bent by the folding structure, and the folding structure is located above the shaft sleeve.

4. The folding trailer steering system according to claim 3, 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.

5. The folding trailer steering system according to claim 4, characterized in that: The steering assembly comprises: two followers, each of which is located between two wheel swing arms at the same end of two wheels, and two ends of the follower are respectively rotatably connected to the corresponding wheel swing arms.

6. The folding trailer steering system according to claim 5, characterized in that: A transmission rod for connecting with the driven member is provided at the bottom of the pull rod. The pull rod drives the driven member to translate through the transmission rod, and the driven member drives the wheel to rotate.

7. The folding trailer steering system according to claim 6, characterized in that: The rotation axis of the pull rod and the rotation axis of the two wheels are located on the same straight line.

8. The folding trailer steering system according to claim 5, characterized in that: Two transmission rods for connecting with the driven members are arranged at the bottom of the pull rod, and the two transmission rods are rotationally connected with the two driven members respectively. The pull rod drives the driven members to translate through the transmission rods, and the driven members drive the wheels to rotate.

9. The folding trailer steering system according to claim 5, characterized in that: The driven member is a flexible structural member.

10. The folding trailer steering system according to claim 2, characterized in that: The mounting platform includes: an outer cover and a mounting seat, and both opposite sides of the mounting seat are provided with avoidance grooves for the straight rod to rotate within a predetermined angle. The outer cover is detachably arranged on the two sides of the mounting seat with the avoidance grooves, and the middle parts of the two outer covers are detachably connected to the middle parts of the corresponding straight rods respectively. A mounting groove is arranged in the middle part of the mounting seat, and a support rod is arranged in the mounting groove. One end of the support rod passes through the mounting seat, and a sliding groove is arranged at the end of the support rod passing through the mounting seat. The positions of the two straight rods located in the mounting platform are respectively rotatably provided with connecting rods, and the two connecting rods are connected together by a pin shaft away from the end connected to the straight rod, and the pin shaft is located in the sliding groove and slidably cooperates with the sliding groove.

11. The folding trailer 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.

12. The folding trailer steering system according to claim 11, characterized in that: The folding vehicle body is provided with an electric steering device on the side where the power wheel is located, and the electric steering device is connected to the corresponding wheel through a connecting rod.

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