Folding wagon steering system

Abstract

A folding wagon steering system, comprising: a folding wagon body, wherein wheels are respectively disposed on two ends of the bottom of the folding wagon body, and one end of the folding wagon body is further provided with a steering assembly at the bottom; the steering assembly is connected to the wheels on at least one end, the steering assembly being used for driving the connected wheels to steer; and the end of the folding wagon body that is provided with the steering assembly is further provided with a pull rod, the pull rod being connected to the steering assembly, and by means of rotating, the pull rod driving the steering assembly to translate. According to the described design, by providing the steering assembly between two wheels, controlling steering of the wheels by means of the steering assembly makes control easy and convenient and facilitates application; using such a structure allows for the replacement of the wheels with straight-fork universal wheels, thus improving the stability of travel of the folding wagon, ensuring high safety in use, and simplifying steering; moreover, the steering assembly is a flexible structural member, and has the characteristic of being deformable, making it suitable for a gathered folding wagon body, reducing the cost.

Description

Folding trailer steering system 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 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 folding trailer 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 steering system, 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 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, the steering assembly is deformed as the folding body gathers, the 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 rotation.

[0006] In a preferred embodiment, the folding vehicle body includes: a plurality of side bracket assemblies formed by two straight rods crossing in an "X" shape, a plurality of the side bracket assemblies enclosing a frame with upper and lower openings, a bottom bracket being connected to the bottom of the frame, a mounting platform being sleeved at the intersection of at least one of the side bracket assemblies, 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 the 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 through 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 both ends of the follower are rotationally 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 and a mounting seat, and the 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 provided on the two sides of the mounting seat with the avoidance groove, and the middle parts of the two outer covers are detachably connected to the middle parts of the corresponding straight rods respectively, and a mounting groove is provided in the middle part of the mounting seat, and a support rod is provided in the mounting groove, one end of the support rod passes through the mounting seat, and a sliding groove is provided at the end of the support rod passing through the mounting seat, and 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 slides 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 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 to the follower are provided at the bottom of the pull rod, and the two transmission rods are rotatably connected to the two follower respectively. The pull rod drives the follower to translate through the transmission rods, and the follower drives the wheel to rotate.

[0017] In a preferred embodiment, a seat device is also provided on the top of one end of the folding vehicle body where the steering assembly is provided.

[0018] In a preferred embodiment, the folding vehicle body is provided with a footrest connected to one end of the pull rod in a limited rotation manner, and the footrest can rotate within a predetermined angle relative to the folding vehicle body.

[0019] In a preferred embodiment, there are two footrests, which are respectively arranged on both sides of the folding body, and each footrest includes: a first pedal; one end of the first pedal is connected to the folding body for limited rotation, and the first pedal can be rotated within a predetermined vertical angle relative to the folding body.

[0020] In a preferred embodiment, the footrest further comprises: a second pedal rod, which is rotationally connected to an end of the first pedal rod away from the folding vehicle body, and the second pedal rod can rotate within a predetermined lateral angle relative to the first pedal rod.

[0021] In a preferred embodiment, a positioning lock pin is further provided on the bottom surface of one end of the second pedal connected to the first pedal, and a lock hole matching the positioning lock pin is opened at one end of the first pedal connected to the second pedal, and there is at least one lock hole. The second pedal is fixed at a predetermined angle through the cooperation between the positioning lock pin and the lock hole.

[0022] In a preferred embodiment, a brake device is further provided on one side of the pedal, the brake device is connected to the brake structure of the wheel, and the brake device rotates relative to the folding vehicle body.

[0023] In a preferred embodiment, the braking device includes: a brake lever and a mounting member; the brake lever is rotatably connected to the pedal, the mounting member is fixedly connected to the pedal, the mounting member and the pedal are spaced apart, a brake line is provided on the fixing clamp of the mounting member, one end of the brake line is rotatably connected to the brake lever, and the other end is connected to the wheel, and when the brake lever rotates, the brake line is driven to extend or retract, and a reset spring for resetting the brake lever is also connected between the brake lever and the mounting member.

[0024] In a preferred embodiment, the end of the brake lever away from the brake line is upwardly tilted, and a groove is provided at the brake lever corresponding to the pedal. A limiting column is provided on the pedal, and the limiting column is located in the groove.

[0025] The beneficial effects of the present invention are as follows: by arranging a steering assembly between the two wheels, the steering of the wheels is controlled by the steering assembly, and the control is simple, convenient and practical. By adopting this structure, the wheels can be replaced with straight-forked universal wheels, thereby improving the driving stability of the vehicle, increasing the safety of use, and making steering easier. 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

[0026] Figure 1 is a schematic structural diagram of the present invention;

[0027] FIG2 is a schematic diagram of the coordination between the steering assembly and the wheel of the present invention;

[0028] Figure 3 is a schematic structural diagram of the pull rod of the present invention;

[0029] Figure 4 is an exploded view of the mounting platform of the present invention;

[0030] FIG5 is a schematic structural diagram of a second embodiment of the present invention;

[0031] FIG6 is a folding schematic diagram of the second embodiment of the present invention;

[0032] Figure 7 is an assembly diagram of the pedal and brake device of the present invention;

[0033] Figure 8 is a schematic structural diagram of the utility model pedal;

[0034] Figure 9 is a schematic structural diagram of the brake lever of the present invention;

[0035] Figure 10 is a schematic structural diagram of the braking device of the present invention;

[0036] FIG11 is a conventional state diagram of the brake device of the present invention.

[0037] In the picture:

[0038] 10. Folding body; 11. Side stand 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; 13. Pull rod; 14. Bushing; 15. Transmission rod; 16. Wheel; 17. Wheel swing arm;

[0039] 20. Steering assembly; 21. Follower;

[0040] 30. Electronically controlled steering device;

[0041] 40. Foot pedal; 41. First pedal; 42. Second pedal; 43. Positioning lock pin; 44. Lock hole;

[0042] 50. Braking device; 51. Brake lever; 52. Mounting part; 53. Brake cable; 54. Return spring; 55. Groove. DETAILED DESCRIPTION

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] As shown in Figures 1 to 4, the present invention provides a folding trailer steering system, comprising: a folding body 10, wherein wheels 16 are respectively provided at both ends of the bottom of the folding body 10, a steering assembly 20 is further provided 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 further 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;

[0049] Specifically, wheels 16 are connected to both ends of the bottom of the folding body 10. The wheels 16 can be conventional wheels 16 without power output or powered wheels with power output, such as the powered wheels of electric bicycles and electric wheelchairs. The wheels 16 can all be powered wheels or only one end of the wheel 16 can be a powered wheel, which can be determined according to actual usage requirements. A steering assembly 20 is also provided at the bottom of the folding body 10. The steering assembly 20 is connected to at least one end of the wheel 16 for controlling the direction of the wheel 16 connected thereto to control the direction of movement of the folding body 10. When the steering assembly 20 is connected to the wheels 16 at both ends, it means that the wheels at each end 16 are all connected to the steering assembly 20; a pull rod 13 is also provided at at least one end of the folding body 10 with the steering assembly 20, and the bottom of the pull rod 13 is connected to the corresponding steering assembly 20, which makes it convenient to tow the folding body 10 while controlling the movement of the steering assembly 20 by rotating the pull rod 13, thereby driving the wheels 16 to steer and realize direction control. 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 safety in use. Moreover, under heavy load conditions, the steering of the straight fork universal wheel is simpler.

[0050] Furthermore, the folding vehicle body 10 includes: a plurality of side support assemblies 11 formed by two straight rods (not shown) crossing each other in an "X" shape; a mounting platform 12 is sleeved at the intersection of at least one of the side support assemblies 11; the side support assembly 11 can rotate within a predetermined angle relative to the mounting platform 12 without the mounting platform 12 moving with it; at least one of the mounting platforms 12 is located at the end where the steering assembly 20 is located; and the pull rod 13 is detachably connected to the mounting platform 12;

[0051] Specifically, each of the front, rear, left, and right sides of the folding vehicle body 10 has 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 enhance the strength of the vehicle body. The folding vehicle body 10 is a gathering type vehicle body. The gathering type folding vehicle body 10 is a rectangular frame formed by the side bracket assemblies 11 in the front, rear, left, and right directions, and the middle bottom surface of the frame is also provided with a foldable bottom bracket. When folded, the middle bottom bracket arches upward, and the front, rear, left, and right sides gather toward the middle from the four directions. Folding, a mounting platform 12 is provided at the intersection of the side support assembly 11, and the mounting platform 12 is used to hang items, such as a hanging basket, to increase the cargo capacity of the trailer. When the side support assembly 11 is rotated, folded or unfolded, the mounting platform 12 can always remain in a vertical state to prevent the items hung thereon from tilting or falling; the folding body 10 is provided with at least one side support assembly 11 at one end of the steering assembly 20, and the side support 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.

[0052] Furthermore, a shaft sleeve 14 is provided in the middle of the pull rod 13. The pull rod 13 can rotate relative to the shaft sleeve 14. The shaft 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. The folding structure is located above the shaft sleeve 14.

[0053] Specifically, the middle part of the pull rod 13 is provided with a shaft sleeve 14, 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, and the bottom of the pull rod 13 is connected to the steering assembly 20. At the same time, the middle part of the pull rod 13 is also provided with a folding structure, which is used to enable the pull rod 13 to rotate and bend in the vertical direction to make it more convenient to tow 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.

[0054] Furthermore, there are two wheels 16 at each end, and the steering assembly 20 is located between the two wheels 16 at the same end. The front and rear ends of each wheel 16 at the same end as the steering assembly 20 are respectively provided with wheel swing arms 17, and each end of the steering assembly 20 is rotatably connected to the two wheel swing arms 17 at the corresponding end.

[0055] 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 and rear ends 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.

[0056] Furthermore, the steering assembly 20 includes: two followers 21, each of the followers 21 is located between the two wheel swing arms 17 at the same end of the two wheels 16, and both ends of the follower 21 are rotatably connected to the corresponding wheel swing arms 17;

[0057] 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 noted 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.

[0058] Furthermore, a transmission rod 15 is provided at the bottom of the pull rod 13 for connecting to the follower 21. The pull rod 13 drives the follower 21 to translate through the transmission rod 15, and the follower 21 drives the wheel 16 to rotate.

[0059] Specifically, since it is inconvenient to directly drive the rotation of the wheel 16, 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 the 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, and the follower 21 drives one of the wheels 16 to rotate left and right. The wheel 16 drives the other wheel 16 to rotate synchronously through the follower 21.

[0060] 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, since 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. At this time, 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.

[0061] 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.

[0062] Furthermore, in this embodiment, the mounting platform 12 includes: an outer cover 121, a mounting seat 122, and 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 provided 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. 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 the end of the support rod 125 passing through the mounting seat 122. The 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 128 at one end away from the connection with the straight rod. The pin 128 is located in the slide groove 126 and slidably cooperates with the slide groove 126.

[0063] 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 is 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, and the straight rod is covered 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 base 122. Two connection holes are reserved on both sides of the outer cover 121 for connecting items such as hanging baskets. In order to prevent the mounting base 122 from rotating when the straight rod rotates, a mounting groove 124 is provided in the middle of the mounting base 122, and a support rod 125 is provided in the mounting groove 124. The support rod 125 is adapted to the mounting groove 124. One end of the support rod 125 extends out of the mounting base 122, and a slide groove 126 is provided on the end extending out of the mounting base 122. 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 needs to be vertical on the mounting seat 122. 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 rotated with a connecting rod 127. The end of the connecting rod 127 away from the straight rod is connected together by a pin 128, and the pin 128 is slidably matched with the slide groove 126. 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 rotation of the two straight rods is synchronous, the forces are also equal. Therefore, at this time, 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 items connected to the mounting platform 12 are always in a vertical state.

[0064] Furthermore, 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 16 at at least one end is a powered wheel and electrically connected to the controller;

[0065] 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 control of the controller can be achieved by setting a control button at the pull rod 13 or by remote control, wherein the controller and the power supply can be hung on the mounting platform 12.

[0066] 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;

[0067] 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 a motor with a reduction gearbox, and its output end has a steering swing arm. The steering swing arm 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 to it is driven to rotate through the connecting rod, and the wheel 16 drives the other wheel 16 to move synchronously through the follower 21, thereby realizing remote control steering.

[0068] Second embodiment, as shown in Figures 5 and 6, in this embodiment, two transmission rods 15 for connecting to the follower 21 are provided at the bottom of the pull rod 13. The two transmission rods 15 are rotatably connected to the two followers 21 respectively. The pull rod 13 drives the follower 21 to translate through the transmission rods 15, and the follower 21 drives the wheel 16 to rotate.

[0069] Specifically, the difference between the second embodiment and the first embodiment is that the first embodiment has one transmission rod 15, and the second embodiment has two transmission rods 15, and in the first embodiment, the rotation center of the pull rod 13 needs to be in the same straight line with the rotation center of the wheels 16 on both sides, but this is not necessary in the second embodiment. Figure 5 shows one implementation of the second embodiment. 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 and the vertical rods on both sides are staggered, the two followers 21 will be restricted by the transmission rod 15 and no longer in a straight line, but in a "V" shape with the middle part 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 to ensure that the pull rod 13 can rotate smoothly.

[0070] Furthermore, in the first embodiment or the second embodiment, a seat device (not shown in the figure) is further provided on the top of one end of the folding vehicle body 10 provided with the steering assembly 20;

[0071] Specifically, in order to further enhance the user experience of the folding trailer, a seat device can be detachably installed on the top of one end of the folding body 10 where the steering assembly 20 is provided, and the user can sit on the seat device to ride, thereby enhancing the user experience.

[0072] Furthermore, as shown in FIG7-FIG8, the folding body 10 is provided with a footrest 40 at one end of the pull rod 13, and the footrest 40 can rotate within a predetermined angle relative to the folding body 10;

[0073] Specifically, the footrest 40 is provided at one end where the pull rod is located, and the footrest 40 is rotatably connected to the folding body 10. In order to realize the function of the footrest 40, the rotation of the footrest 40 and the folding body 10 is only within a predetermined angle. When the maximum value of the predetermined angle is reached, the footrest 40 is restricted and can no longer continue to rotate, so that the footrest 40 generates a supporting force in a predetermined state. At this time, when the user sits on the seat device, the feet can be placed on the footrest 40. When not in use, the footrest 40 can be rotated and folded.

[0074] Furthermore, two footrests 40 are provided, one on each side of the folding body 10, and each footrest 40 includes a first pedal 41; one end of the first pedal 41 is connected to the folding body 10 for limited rotation, and the first pedal 41 can rotate within a predetermined vertical angle relative to the folding body 10;

[0075] Specifically, there are two footrests 40, one on each side of the folding body 10, wherein each footrest 40 includes a first pedal rod 41, which is rotatably connected to the folding body 10, and the first pedal rod 41 can rotate within a predetermined vertical angle relative to the folding body 10. The braking device 50 is arranged on the side of the first pedal rod 41, and the braking device 50 rotates with the rotation of the first pedal rod 41, wherein the bottom surface of the first pedal rod 41 is hollowed out to reduce the weight of the first pedal rod 41 and reduce the consumables of the first pedal rod 41, while not affecting the stability of the first pedal rod 41.

[0076] Furthermore, the footrest 40 further includes: a second pedal rod 42, the second pedal rod 42 being rotationally connected to an end of the first pedal rod 41 away from the folding body 10, and the second pedal rod 42 being rotatable relative to the first pedal rod 41 within a predetermined lateral angle;

[0077] Specifically, in order to enhance the user experience, the footrest 40 also includes a second pedal rod 42. To adapt to the usage habits of most people, one end of the second pedal rod 42 is rotatably connected to the first pedal rod 41, and the second pedal rod 42 can rotate laterally relative to the first pedal rod 41, wherein the direction of rotation of the second pedal rod 42 is toward the direction of the other second pedal rod 42, and the rotation of the second pedal rod 42 can also avoid conflict with the pull rod 13 when the folding body 10 is folded. When folding is required, the second pedal rod 42 can be rotated so that it is in a straight line with the first pedal rod 41. At this time, even if the two sides move closer to the middle when the folding body 10 is folded, the second pedal rod 42 will not conflict with the pull rod 13.

[0078] Furthermore, in order to prevent the second pedal rod 42 from rotating freely relative to the first pedal rod 41, a positioning lock pin 43 is fixedly installed on the bottom surface of the second pedal rod 42. At the same time, a lock hole 44 is opened on the end surface of one end where the first pedal rod 41 and the second pedal rod 42 are connected. There are two lock holes 44, one is used to make the second pedal rod 42 and the first pedal rod 41 in a straight state, and the other is used to make the second pedal rod 42 and the first pedal rod 41 in an inclined state. By cooperating with the positioning lock pin 43 and the lock hole 44, the second pedal rod 42 is fixed in any state to limit its movement, and the positioning lock pin 43 has a spring inside.

[0079] Furthermore, as shown in FIG9 to FIG11 , a brake device 50 is further provided on one side of the pedal 40 , and the brake device 50 is connected to the brake structure of the wheel 16 , and the brake device 50 rotates relative to the folding body 10 ;

[0080] Specifically, in order to improve the driving safety of the folding body 10, a braking device 50 is provided on one side of the footrest 40. At the same time, a mechanical brake structure such as a disc brake or a drum brake is installed on the wheel 16. The braking device 50 is connected to the mechanical brake structure on the wheel 16. When braking is required, the trailer can be stopped by stepping on the braking device 50. The braking device 50 can be rotated relative to the folding body 10. When the footrest 40 is in a folded state, the braking device 50 can also be in a folded state to avoid taking up space when stored.

[0081] Furthermore, the braking device 50 includes: a brake lever 51 and a mounting member 52; the brake lever 51 is rotatably connected to the pedal 40, the mounting member 52 is fixedly connected to the pedal 40, the mounting member 52 is spaced apart from the pedal 40, and a brake line 53 is fixedly clamped on the mounting member 52. One end of the brake line 53 is rotatably connected to the brake lever 51, and the other end is connected to the wheel 16. When the brake lever 51 rotates, it drives the brake line 53 to extend or retract. A reset spring 54 is also connected between the brake lever 51 and the mounting member 52 for resetting the brake lever 51.

[0082] When the brake lever 51 is in the braking state, the return spring 54 is stretched, and when the brake lever 51 loses the external force, the return spring 54 pulls the brake lever 51 to reset itself.

[0083] Furthermore, the end of the brake lever 51 away from the brake line 53 is tilted upward, and a groove 55 is provided at the brake lever 51 corresponding to the pedal 40. A limiting post is provided on the pedal 40, and the limiting post is located in the groove 55.

[0084] Specifically, the end of the brake lever 51 away from the brake line 53 is in an upwardly extending tilted shape, so that the brake lever 51 protrudes from the top plane of the first pedal 41 and the second pedal 42, so that the user has a certain travel before stepping on the brake lever 51 to be restricted by the first pedal 41 for braking. Preferably, the end adjacent to the mounting member 52 is also in an upwardly extending tilted shape, which is convenient for pulling out the brake line 53 and does not cause friction between the brake line 53 and the mounting member 52; and in order to avoid excessive rotation of the brake lever 51, a groove 55 is further meandered on the brake lever 51, and a limit column is provided at a predetermined position of the first pedal 41. The limit column and the groove 55 cooperate to limit the maximum rotation angle of the brake lever 51.

[0085] In summary, the present invention 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-fork universal wheels, thereby improving the stability of vehicle driving, increasing safety in use, and making steering simpler. At the same time, the steering assembly 20 adopts a flexible structural part and utilizes its deformable characteristics to adapt to the gathered folding body 10, which is lower in cost.

[0086] 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 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 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 turn, the steering assembly is deformed as the folding body is gathered, the end of the folding body where the steering assembly is provided 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, the plurality of side bracket assemblies enclosing a frame with upper and lower openings, a bottom bracket being connected to the bottom of the frame, a mounting platform being sleeved at the intersection of at least one of the side bracket assemblies, 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.

13. The folding trailer steering system according to claim 11, characterized in that: The top of one end of the folding vehicle body provided with the steering assembly is also provided with a seat device.

14. The folding trailer steering system according to claim 11, characterized in that: The folding vehicle body is provided with one end of the pull rod which is also connected to a pedal in a limited rotation manner, and the pedal can rotate within a predetermined angle relative to the folding vehicle body.

15. The folding trailer steering system according to claim 14, characterized in that: There are two footrests, which are respectively arranged on both sides of the folding vehicle body. Each footrest includes: a first pedal; one end of the first pedal is connected to the folding vehicle body for limited rotation, and the first pedal can rotate within a predetermined vertical angle relative to the folding vehicle body.

16. The folding trailer steering system according to claim 15, characterized in that: The footrest also includes a second pedal rod, which is rotationally connected to one end of the first pedal rod away from the folding vehicle body in a limited position, and the second pedal rod can rotate within a predetermined lateral angle relative to the first pedal rod.

17. The folding trailer steering system according to claim 16, characterized in that: A positioning lock pin is also provided on the bottom surface of one end of the second pedal rod connected to the first pedal rod, and a lock hole matching the positioning lock pin is opened at one end of the first pedal rod connected to the second pedal rod, and there is at least one lock hole. The second pedal rod is fixed at a predetermined angle through the cooperation between the positioning lock pin and the lock hole.

18. The folding trailer steering system according to claim 14, characterized in that: A brake device is also provided on one side of the pedal, the brake device is connected to the brake structure of the wheel, and the brake device rotates relative to the folding vehicle body.

19. The folding trailer steering system according to claim 18, characterized in that: The braking device includes: a brake lever and a mounting member; the brake lever is rotatably connected to the pedal, the mounting member is fixedly connected to the pedal, the mounting member and the pedal are spaced apart, a brake line is fixedly clamped on the mounting member, one end of the brake line is rotatably connected to the brake lever, and the other end is connected to the wheel, the brake lever drives the brake line to extend or retract when it rotates, and a reset spring for resetting the brake lever is also connected between the brake lever and the mounting member.

20. The folding trailer steering system according to claim 19, characterized in that: One end of the brake lever away from the brake line is in an upward tilted shape, and a groove is provided at a position corresponding to the brake lever and the pedal. A limiting column is provided on the pedal, and the limiting column is located in the groove.

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