Steering system of gathering type folding trailer

Abstract

The steering system of the gathering type folding trailer 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 wheels at at least one end, and the steering assembly is used for driving the connected wheels to steer. By the adoption of the design, the steering assembly composed of the multiple folding rods is arranged between the two wheels, steering of the wheels is controlled through the steering assembly, the steering assembly can be folded so as to be matched with folding of the folding vehicle body, control is easy, convenient and practical, and by the adoption of the structure, the folding vehicle is convenient to use and popularize. Wheels can be replaced by straight fork universal wheels, the running stability of the vehicle is improved, the use safety is high, steering is simpler, meanwhile, the movable shaft is arranged between the folding rod and the transmission rod to adapt to the situation that the height difference exists between the folding rod and the transmission rod, design is reasonable, the structure is simple, and cost is low.

Description

Technical Field

[0001] The utility model relates to the technical field of trailers, in particular to a steering system of a gathering type 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, and the resistance of the uneven road surface is added. At this time, the force applied needs to be greater than various resistances, especially under heavy load, which greatly affects the use experience of the trailer.

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

[0005] The technical solution adopted by the utility model to solve the above technical problems is: a steering system of a foldable trailer, characterized in that it comprises: a foldable body, wheels are respectively arranged at both ends of the bottom of the foldable body, a steering assembly is also arranged at the bottom of one end of the foldable 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, and the end of the foldable body provided with the steering assembly is also connected to a pull rod;

[0006] The steering assembly includes: a plurality of folding rods, the plurality of folding rods are rotatably connected head to tail, the folding rods at both ends are rotatably connected to the corresponding wheels, the bottom end of the pull rod is movably connected to the folding rod in the middle, and the pull rod can rotate horizontally relative to the folding body to drive the steering assembly to translate.

[0007] In a preferred embodiment, the folding body includes: a plurality of side bracket assemblies formed by two straight rods crossing in an "X" shape, a mounting platform is provided at the intersection of at least one of the side bracket assemblies or at the connection between two adjacent side bracket assemblies, the side bracket assembly can rotate within a predetermined angle relative to the mounting platform and the mounting platform does not move with it, at least one of the mounting platforms is located at one end where the steering assembly is located, and the pull rod is detachably connected to the mounting platform.

[0008] 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.

[0009] In a preferred embodiment, there are two wheels at each end, the steering assembly is located between the two wheels at the same end, each wheel at the same end as the steering assembly is provided with a wheel swing arm, and the folding rods at both ends are rotatably connected to the corresponding wheel swing arms.

[0010] In a preferred embodiment, the mounting platform includes: an outer cover and a mounting seat, and the mounting seat has two opposite sides each provided with an avoidance groove for the straight rod to rotate within a predetermined angle, and the outer cover is detachably arranged 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.

[0011] In a preferred embodiment, the two opposite sides of the mounting seat are respectively provided with a limit block integrally formed with the mounting seat, the limit blocks on the two sides are diagonally arranged, and the side of the mounting seat provided with the limit block can also be detachably provided with a pressure block, the pressure block and the corresponding limit block are diagonally arranged, and the interval between the pressure block and the corresponding limit block forms the avoidance groove, and the two sides of the mounting seat are also respectively provided with a placement groove, and a rack is slidably provided in the placement groove, and the pressure block is pressed on one end of the corresponding rack, and each rack is provided with a vertical part at the end away from the pressure block, and the vertical part is provided with a moving groove, and each straight rod is connected to a moving shaft that slidably cooperates with the moving groove, and when the two straight rods rotate, the moving shaft slides in the moving groove and pushes the rack to slide in the placement groove.

[0012] In a preferred embodiment, a transmission rod for movably connecting with the folding rod is provided at the bottom of the pull rod, and a first sliding groove is opened at the end of the transmission rod away from the pull rod. A movable shaft is passed through the folding rod located in the middle, and the movable shaft is also located in the first sliding groove and slidably cooperates with the first sliding groove. The movable shaft can also move vertically relative to the folding rod and the transmission rod.

[0013] In a preferred embodiment, a folding pressure block is also slidably provided on the transmission rod, one end of the folding pressure block is located on the end of the transmission rod where the first slide groove is provided and is spaced apart from the transmission rod, the other end of the folding pressure block extends vertically upward and is provided with a bayonet at the end, a vertical locking block is provided at the bottom of the sleeve, a locking hole corresponding to the bayonet pin is provided at the end of the locking block, a second slide groove is also provided in the middle part of the transmission rod, a connecting part is provided at the bottom of the folding pressure block, the connecting part passes through the second slide groove, a cable is connected to the connecting part, and the other end of the cable is located in the folding body.

[0014] In a preferred embodiment, a return spring is provided between the vertical end of the folding pressing block and the pull rod.

[0015] 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.

[0016] In a preferred embodiment, the folding vehicle body is provided with an electric steering device at one end side portion where the steering assembly is located, and the electric steering device is connected to the corresponding wheel via a connecting rod.

[0017] The beneficial effects of the utility model are as follows: a steering assembly consisting of multiple folding rods is arranged between two wheels, the steering of the wheels is controlled by the steering assembly, and the steering assembly can be converted between the unfolded state and the folded state to adapt to the folding of the folding body. The control is simple, convenient and practical. By adopting this structure, the wheels 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, a movable shaft is provided between the folding rod and the transmission rod. Through the setting of the movable shaft, the situation where there is a height difference between the folding rod and the transmission rod when the folding body is folded is adapted. The design is reasonable, the structure is simple, and the cost is low. 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 3It is a structural schematic diagram of the transmission rod and the folding pressing block of the utility model;

[0021] Figure 4 It is a structural schematic diagram of the pull rod of the utility model;

[0022] Figure 5 This is an exploded view of the mounting platform of the utility model;

[0023] Figure 6 This is a schematic diagram of the internal structure of the mounting platform of the utility model;

[0024] Figure 7 It is a bottom view of the utility model;

[0025] Figure 8 It is a folding schematic diagram of the utility model.

[0026] In the figure:

[0027] 10. Folding body; 11. Side bracket assembly; 12. Mounting platform; 121. Outer cover; 122. Mounting seat; 123. Avoidance groove; 124. Limit block; 125. Pressing block; 126. Placement groove; 127. Rack; 128. Vertical part; 129. Movement groove; 130. Movement axis; 14. Pull rod; 141. Bushing; 142. Transmission rod; 143. First slide groove; 144. Second slide groove; 145. Locking block; 146. Locking hole; 15. Folding pressing block; 151. Bayonet pin; 152. Connecting part; 16. Cable; 17. Wheel; 171. Wheel swing arm;

[0028] 20. Steering assembly; 21. Folding rod; 22. Movable shaft;

[0029] 30. Electronic steering device. DETAILED DESCRIPTION

[0030] 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.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] like Figure 1-Figure 8As shown, the utility model provides a steering system for a foldable trailer, characterized in that it comprises: a foldable body 10, wheels 17 are respectively provided at both ends of the bottom of the foldable body 10, a steering assembly 20 is further provided at the bottom of one end of the foldable body 10, the steering assembly 20 is connected to the wheel 17 at at least one end, the steering assembly 20 is used to drive the connected wheel 17 to steer, and the end of the foldable body 10 provided with the steering assembly 20 is further connected to a pull rod 14;

[0036] The steering assembly 20 includes: a plurality of folding rods 21, the plurality of folding rods 21 are rotatably connected head to tail, the folding rods 21 at both ends are rotatably connected to the corresponding wheels 17, the bottom end of the pull rod 14 is movably connected to the folding rod 21 in the middle, and the pull rod 14 can rotate horizontally relative to the folding vehicle body 10 to drive the steering assembly 20 to translate;

[0037] Specifically, the folding body 10 is a gathering type body, which is arched upward in the middle and folded toward the middle from four directions, front, back, left, and right. The space occupied by the gathering type body after folding will be less than that of other types of folding bodies 10. Wheels 17 are connected to the two ends of the bottom of the folding body 10, respectively. The wheels 17 can be conventional wheels 17 without power output or power wheels with power output. The power wheels can refer to the power wheels of electric bicycles, the power wheels of electric wheelchairs, etc.; and the wheels 17 can all be power wheels or only the wheels 17 at one end can be the 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. The steering assembly 20 is connected to the wheel 17 at at least one end, and is used to control the direction of the wheel 17 connected thereto, so as to control the movement direction of the folding body 10, wherein the steering assembly 20 is connected to the wheels 17 at both ends, which means that the wheels 17 at each end are connected to the steering assembly 20. Component 20; at least one end of the steering assembly 20 is also connected to a pull rod 14, and the bottom of the pull rod 14 is connected to the corresponding steering assembly 20, which is convenient for towing the folding body 10, and can also control the movement of the steering assembly 20 through the pull rod 14, thereby driving the wheel 17 to turn and realize direction control. The number of pull rods 14 corresponds to the number of steering assemblies 20; wherein the steering assembly 20 includes: a plurality of folding rods 21, and the plurality of folding rods 21 are rotatably connected in sequence head to tail, and the plurality of folding rods 21 can rotate with each other through the rotatable connection, and can be converted between a "one" shape and a nearly "several" shape according to needs, so as to realize adaptation to the gathered type of body, so as to avoid the folding body 10 being restricted by the steering assembly 20 and unable to be folded when it needs to be folded, and the folding rods 21 at both ends are rotatably connected to the corresponding wheels 17, and when the folding rods 21 move driven by the pull rod 14, the wheels 17 are driven to turn left and right.

[0038] It should be pointed out that the wheel 17 is a straight fork universal wheel, which is 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, thereby improving safety in use. In addition, under heavy load conditions, the straight fork universal wheel is easier to steer.

[0039] Further, the folding vehicle body 10 includes: a plurality of side bracket assemblies 11 formed by two straight rods (not shown in the figure) crossing in an "X" shape, a mounting platform 12 is provided at the intersection of at least one of the side bracket assemblies 11 or at the connection of two adjacent side bracket assemblies 44, the side bracket assembly 11 can rotate within a predetermined angle relative to the mounting platform 12 and the mounting platform 12 does not follow the movement, at least one of the mounting platforms 12 is located at the end where the steering assembly 20 is located, and the pull rod 14 is detachably connected to the mounting platform 12;

[0040] Specifically, the front, rear, 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 14 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. Another way is to set the mounting platform 12 at the connection between two adjacent side bracket assemblies 11.

[0041] Furthermore, a shaft sleeve 141 is sleeved in the middle of the pull rod 14, the pull rod 14 can rotate relative to the shaft sleeve 141, the shaft sleeve 141 is detachably connected to the mounting platform 12, and a folding structure (not shown in the figure) is provided in the middle of the pull rod 14, the pull rod 14 is bent by the folding structure, and the folding structure is located above the shaft sleeve 141;

[0042] Specifically, a shaft sleeve 141 is provided in the middle of the pull rod 14, and the pull rod 14 can rotate horizontally relative to the shaft sleeve 141. The shaft sleeve 141 is detachably connected to the mounting platform 12. The pull rod 14 is fixed to the mounting platform 12 through the shaft sleeve 141. The bottom of the pull rod 14 is connected to the steering assembly 20. At the same time, a folding structure is also provided in the middle of the pull rod 14. The folding structure is used to enable the pull rod 14 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 141 to avoid being restricted by the shaft sleeve 141 and being unable to fold.

[0043] It should be pointed out that the pull rod 14 can be set to a telescopic structure according to needs, and the limit of the folding structure can also be fixed by telescoping, that is, the outer rod of the pull rod 14 is a folding structure, and the inner rod is an integrated fixed structure. The inner rod is located in the two structural parts of the folding structure to limit the rotation of the folding structure.

[0044] Furthermore, two wheels 17 are provided at each end, the steering assembly 20 is located between the two wheels 17 at the same end, each wheel 17 at the same end as the steering assembly 20 is provided with a wheel swing arm 171, and the folding rods 21 at both ends are rotatably connected to the corresponding wheel swing arms 171;

[0045] Specifically, there are two wheels 17 at each end, and the two wheels 17 are arranged at an interval. The steering assembly 20 is arranged between the two wheels 17 at the same end. The front end and the rear end of each wheel 17 connected to the steering assembly 20 are respectively provided with wheel swing arms 171. The wheel swing arms 171 at the same end of the two wheels 17 are connected together through the steering assembly 20. When one of the wheels 17 rotates, the other wheel 17 is driven to rotate synchronously in the same direction through the steering assembly 20. The wheel swing arm 171 and the steering assembly 20 are rotatably connected, so that the angle between the wheel swing arm 171 and the steering assembly 20 can be changed to achieve the steering effect.

[0046] Furthermore, the mounting platform 12 comprises: an outer cover 121, a mounting seat 122, 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 provided 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 respectively;

[0047] Specifically, each mounting platform 12 includes two outer covers 121 and a mounting seat 122. The mounting seat 122 is arranged between 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, wherein the function of the avoidance groove 123 is to enable 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 connected to the middle of the corresponding straight rod by screws. The two outer covers 121 are also fixedly connected to the mounting seat 122, wherein two connecting holes are reserved on both sides of the outer cover 121 for connecting items such as hanging baskets.

[0048] Furthermore, the two opposite sides of the mounting seat 122 are respectively provided with a limit block 124 integrally formed with the mounting seat 122, and the limit blocks 124 on both sides are arranged diagonally. The side of the mounting seat 122 provided with the limit block 124 can also be detachably provided with a pressure block 125, and the pressure block 125 is arranged diagonally with the corresponding limit block 124, and the interval between the pressure block 125 and the corresponding limit block 124 forms the avoidance groove 123. The two sides of the mounting seat 122 are also provided with a placement groove 12 6. Racks 127 are slidably provided in the placement grooves 126, and the pressing block 125 is pressed on one end of the corresponding rack 127. A vertical portion 128 is provided at one end of each rack 127 away from the pressing block 125. The vertical portion 128 is provided with a motion groove 129. Each straight rod is connected to a motion shaft 130 that is slidably matched with the motion groove 129. When the two straight rods rotate, the motion shaft 130 slides in the motion groove 129 and pushes the rack 127 to slide in the placement groove 126.

[0049] Specifically, limit blocks 124 integrally formed with the mounting seat 122 are respectively provided on the two opposite sides of the mounting seat 122, and the two limit blocks 124 are arranged diagonally. A pressure block 125 is detachably provided on each side of the mounting seat 122 with the limit blocks 124 by fasteners such as screws. Each pressure block 125 is diagonally arranged with the corresponding limit block 124, and the spacing distance between the pressure block 125 and the limit block 124 forms an avoidance groove 123. A placement groove 126 is also respectively opened on each side of the mounting seat 122 with the limit blocks 124. The placement groove 126 is located on the bottom side of the mounting seat 122, and each placement groove 126 is placed with a rack 127, which can slide in the placement groove 126. When the pressure block 125 is fixed on the mounting seat 122, one end of the rack 127 is pressed together in the placement groove 126. To prevent the rack 127 from falling, a vertical vertical portion 128 is provided at the end of the rack 127 away from the pressure block 125. The vertical portion 128 and the rack 127 form an "L" shape, and a motion groove 129 is opened on the vertical portion 128. At the same time, each straight rod is provided with a motion shaft 130 that slides with the motion groove 129. When the straight rod rotates, the motion shaft 130 will push the rack 127 to slide, and the motion shaft 130 will slide along the motion groove 129, thereby realizing the translation of the rack 127, thereby avoiding the movement conflict between the straight rod and the rack 127, and the end of the placement groove 126 pressed by the pressure block 125 is adapted to the rack 127, so that the rack 127 cannot make other displacements except translation, and the mounting seat 122 cannot rotate under the restriction of the rack 127, so it will always be in a vertical state.

[0050] Furthermore, a transmission rod 142 for active connection with the folding rod 21 is provided at the bottom of the pull rod 14, a first slide groove 143 is provided at one end of the transmission rod 142 away from the pull rod 14, a movable shaft 22 is passed through the folding rod 21 located in the middle, the movable shaft 22 is also located in the first slide groove 143 and slidably cooperates with the first slide groove 143, and the movable shaft 22 can also move vertically relative to the folding rod 21 and the transmission rod 142;

[0051] Specifically, a horizontally extending transmission rod 142 is provided at the bottom end of the pull rod 14. A first chute 143 is formed at one end of the transmission rod 142 away from the pull rod 14. At the same time, a movable shaft 22 is movably inserted through the middle folding rod 21. The movable shaft 22 is adapted to the first chute 143 and passes through the first chute 143. The movable shaft 22 can slide vertically and horizontally within the first chute 143. The length of the movable shaft 22 is equal to the rising height of the pull rod 14 when the folding vehicle body 10 is folded. When the folding vehicle body 10 is folded, the center of the side support assembly 11 will rise to a certain extent due to the two ends approaching the middle. At this time, the side support assembly 11 will drive the pull rod 14 to rise through the mounting platform 12. The pull rod 14 will lift the steering assembly 20 of the plurality of folding rod 21 assemblies from the middle through the transmission rod 142, making it arched. When the side support assembly 11 is folded to a certain extent, the center position of the side support assembly 11 will no longer rise at this time. However, due to the influence of the transmission rod 142 on the lifting of the steering assembly 20 at this time, it is already in an arched state. In this state, as the side support assembly 11 continues to fold, the two wheels 17 will approach synchronously. At this time, the steering assembly 20 will be squeezed, causing the steering assembly 20 to continue to fold until the side support assembly 11 is completely folded, and the steering assembly 20 also assumes a "Ji" shape. The function of the movable shaft 22 here is that the steering assembly 20 is first arched by the lifting of the folding rod 21. When the pull rod 14 no longer rises, at this time, the folding is achieved by the extrusion generated by the approach of the two wheels 17. Also at this time, since the pull rod 14 no longer rises, while the steering assembly 20 is still in the rising stage due to folding, a height difference will be generated between the steering assembly 20 and the transmission rod 142. Through the length setting of the movable shaft 22 at this time, the second-stage rising of the steering assembly 20 will not be hindered by the transmission rod 142.

[0052] Further, a folding pressing block 15 is also slidably provided on the transmission rod 142. One end of the folding pressing block 15 is located at the end of the transmission rod 142 provided with the first chute 143 and is spaced from the transmission rod 142. The other end of the folding pressing block 15 extends vertically upward, and a locking pin 151 is provided at the end. A vertical locking block 145 is provided at the bottom of the shaft sleeve 141. A locking hole 146 corresponding to the locking pin 151 is provided at the end of the locking block 145. A second chute 144 is also provided in the middle of the transmission rod 142. A connecting portion 152 is provided at the bottom of the folding pressing block 15. The connecting portion 152 passes through the second chute 144. The connecting portion 152 is connected to a cable 16. The other end of the cable 16 is located inside the folding vehicle body 10;

[0053] Specifically, since the steering assembly 20 is connected by a plurality of folding rods 21 that are rotatably connected end to end and have no limiting structure, during actual use, the plurality of folding rods 21 may arch up by themselves due to external force, which affects use. For this reason, a folding pressing block 15 is slidably provided on the transmission rod 142, one end of the folding pressing block 15 is located above one end of the transmission rod 142 that is provided with a first slide groove 143, and the folding pressing block 15 is spaced apart from the transmission rod 142, and the spacing distance is the height of the folding rod 21, so that when the folding pressing block 15 is located above the first slide groove 143, the folding rod 21 can be pressed down to prevent it from arching; the other end of the folding pressing block 15 extends vertically upward, and the end A latch 151 is also provided, and a locking block 145 extending vertically downward is provided below the shaft sleeve 141. A locking hole 146 adapted to the latch 151 is provided at the end of the locking block 145. When the folding pressing block 15 slides, the latch 151 is inserted into the locking hole 146. The fixing of the pull rod 14 is achieved through the cooperation between the latch 151 and the locking hole 146. This state is used to prevent the wheel 17 from rotating when the folding body 10 is folded. At the same time, in order to facilitate the control of the locking state of the folding pressing block 15, a second sliding groove 144 is further provided in the middle of the transmission rod 142, and a connecting portion 152 is provided on the bottom surface of the folding pressing block 15. The connecting portion 152 passes through the second sliding groove 144 and can be locked in the second sliding groove. The connecting portion 152 is fixedly connected with a cable 16, which is preferably a type of bicycle brake line, that is, a jacket is also provided on the outside of the cable, which is fixedly connected to the transmission rod 142, and the inner cable is fixedly connected to the connecting portion 152, and the other end is arranged on the folding body 10, and has a limit pull ring (not shown in the figure), which can limit the self-retraction of the cable by rotation. The cable 16 structure does not need to consider the length and position of the arrangement, and can be arbitrarily set at any position without affecting its use. In this embodiment, in order to achieve the linkage effect, the pull ring is arranged in the middle of the gathering bracket at the bottom of the folding body 10, and the pull ring passes through the folding When the bag cloth of the vehicle body 10 needs to be folded, the pull ring is first pulled, and then the pull ring is rotated to put it in a limited state. While pulling the pull ring, the other end of the cable 16 will drive the folding pressure block 15 to slide through the connecting portion 152, so that the latch 151 is inserted into the lock hole 146 to achieve the limit. At the same time, the end of the folding pressure block 15 located above the folding rod 21 is also separated from the top of the folding rod 21 due to the sliding of the folding pressure block 15, and the folding vehicle body 10 can be folded at this time; setting the pull ring on the gathering bracket at the bottom of the folding vehicle body 10 can also help remind the user to pull the pull ring first to unlock the limit of the folding pressure block 15 and the folding rod 21, so as to avoid the folding vehicle body 10 from being unable to fold due to forgetfulness.

[0054] Furthermore, a return spring (not shown in the figure) is provided between the vertical end of the folding pressing block 15 and the pull rod 14;

[0055] Specifically, in order to enable the folding block 15 to return to its original position after the pull ring is released from the limit, a return spring is installed between the vertical end of the folding block 15 and the pull rod 14. When the pull ring is in the limit state, the folding block 15 will squeeze the return spring. When the pull ring is released from the limit, the return spring is released and pushes the folding block 15 back, thereby eliminating the need for manual operation and improving ease of use.

[0056] 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 17 at at least one end is a power wheel and is electrically connected to the controller;

[0057] 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 17 or the rear wheel 17 or the wheels 17 at both ends are powered wheels with motors, and the wheels 17 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 14 or by remote control, wherein the controller and the power supply can be mounted on the mounting platform 12.

[0058] 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 17 through a connecting rod;

[0059] 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 171 through a connecting rod, so that when the steering swing arm moves, the wheel 17 connected thereto is driven to rotate through the connecting rod, and the wheel 17 drives another wheel 17 to move synchronously through the folding rod 21, thereby realizing remote control steering.

[0060] In summary, the utility model arranges a steering assembly 20 composed of multiple folding rods 21 between two wheels 17, controls the steering of the wheels 17 through the steering assembly 20, and the steering assembly 20 can be converted between the unfolded state and the folded state to adapt to the folding of the folding body 10. The control is simple, convenient and practical. By adopting this structure, the wheels 17 can be replaced with straight fork universal wheels, which improves the driving stability of the vehicle, has high safety in use, and makes steering easier. At the same time, a movable shaft 22 is provided between the folding rod 21 and the transmission rod 142. Through the setting of the movable shaft 22, it adapts to the situation where there is a height difference between the folding rod 21 and the transmission rod 142 when the folding body 10 is folded. The design is reasonable, the structure is simple, and the cost is low.

[0061] 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 steering system for a foldable trailer, characterized in that: include: A folding vehicle body, wherein wheels are respectively arranged at both ends of the bottom of the folding vehicle body, a steering assembly is also arranged at the bottom of one end of the folding vehicle 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, and the end of the folding vehicle body provided with the steering assembly is also connected to a pull rod; The steering assembly includes: a plurality of folding rods, the plurality of folding rods are rotatably connected head to tail, the folding rods at both ends are rotatably connected to the corresponding wheels, the bottom end of the pull rod is movably connected to the folding rod in the middle, and the pull rod can rotate horizontally relative to the folding body to drive the steering assembly to translate.

2. The steering system of the foldable trailer 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, a mounting platform is provided at the intersection of at least one of the side bracket assemblies or at the connection between two adjacent side bracket assemblies, the side bracket assembly can rotate within a predetermined angle relative to the mounting platform and the mounting platform does not move with it, at least one of the mounting platforms is located at one end where the steering assembly is located, and the pull rod is detachably connected to the mounting platform.

3. The steering system of the foldable trailer 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 steering system of the foldable trailer according to claim 1, characterized in that: There are two wheels at each end, the steering assembly is located between the two wheels at the same end, each wheel at the same end as the steering assembly is provided with a wheel swing arm, and the folding rods at both ends are rotatably connected to the corresponding wheel swing arms.

5. The steering system of the foldable trailer according to claim 2, characterized in that: The mounting platform includes: an outer cover and a mounting seat. 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 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.

6. The steering system of the foldable trailer according to claim 5, characterized in that: The two opposite sides of the mounting seat are respectively provided with a limit block integrally formed with the mounting seat, the limit blocks on the two sides are diagonally arranged, and the side of the mounting seat provided with the limit block can also be detachably provided with a pressure block, the pressure block and the corresponding limit block are diagonally arranged, and the interval between the pressure block and the corresponding limit block forms the avoidance groove, and the two sides of the mounting seat are also respectively provided with a placement groove, and a rack is slidably provided in the placement groove, and the pressure block is pressed on one end of the corresponding rack, and each of the racks is provided with a vertical part at the end away from the pressure block, and the vertical part is provided with a moving groove, and each of the straight rods is connected to a moving shaft that slidably cooperates with the moving groove, and when the two straight rods rotate, the moving shaft slides in the moving groove and pushes the rack to slide in the placement groove.

7. The steering system of the foldable trailer according to claim 3, characterized in that: A transmission rod for movably connecting with the folding rod is provided at the bottom of the pull rod, and a first sliding groove is opened at the end of the transmission rod away from the pull rod. A movable shaft is passed through the folding rod located in the middle, and the movable shaft is also located in the first sliding groove and slidably cooperates with the first sliding groove. The movable shaft can also move vertically relative to the folding rod and the transmission rod.

8. The steering system of the foldable trailer according to claim 7, characterized in that: A folding pressure block is also slidably provided on the transmission rod, one end of the folding pressure block is located on one end of the transmission rod provided with the first sliding groove and is spaced apart from the transmission rod, the other end of the folding pressure block extends vertically upward and is provided with a bayonet at the end, a vertical locking block is provided at the bottom of the sleeve, a locking hole corresponding to the bayonet is provided at the end of the locking block, a second sliding groove is also provided at the middle part of the transmission rod, a connecting part is provided at the bottom of the folding pressure block, the connecting part passes through the second sliding groove, a cable is connected to the connecting part, and the other end of the cable is located in the folding vehicle body.

9. The steering system of the foldable trailer according to claim 8, characterized in that: A return spring is also arranged between the vertical end of the folding pressing block and the pull rod.

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

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

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