New steering structure of folding trailer

Abstract

A new steering structure of a folding trailer. The new steering structure comprises a folding trailer body (10) and a steering rod assembly (13), wherein two steering wheels (11) are provided at one end of the folding trailer body; the steering rod assembly is movably arranged at one end of the folding trailer body; steering swing arms (15) are provided at the bottom of the steering rod assembly or front and rear sides of at least one of the steering wheels; and a flexible pull wire (12) is connected between the steering rod assembly and at least one of the steering wheels, two ends of the flexible pull wire are connected to the steering swing arms, and the middle of the flexible pull wire is fixedly wound around the bottom of the steering rod assembly or a horizontal rotating shaft of the corresponding steering wheel. By adopting the above design, the arrangement of the flexible pull wire can effectively reduce the arrangement cost of the structure while controlling steering, such that the production cost of the whole trailer is reduced; the flexible pull wire has a simpler form and a simpler structure, and is more convenient to assemble; and the flexible pull wire can be made of metal, such that the flexible pull wire has high durability, and relatively low costs.

Description

A new steering structure for folding trailer Technical Field

[0001] The utility model relates to the technical field of folding trailers, in particular to a novel steering structure of 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 is more difficult to control than the straight fork universal wheel, especially on loaded and inclined uphill roads. At this time, the oblique fork universal wheel will rotate in the direction of the sliding force due to the influence of the sliding force. In order to avoid the trailer from losing control of the direction, 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 oblique fork universal wheel will cause the oblique fork universal wheel to turn on its own when squeezed by the uneven road surface. Although the inclined fork universal wheel can be straightened by increasing the forward force at this time, the inclined fork universal wheel is in an inclined state due to extrusion, 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 under heavy load conditions, greatly affecting the user experience of the trailer. To solve this technical problem, the applicant has also designed a steering structure, such as patent No. CN202321386183.6 (a folding electric trailer with sliding wheels). It connects a transmission member between the two directional wheels to make the steering of the two directional wheels controllable, and there are multiple transmission members that are hinged to each other to adapt to the folding of the folding body, with precise control and convenient steering. At the same time, the setting of the transmission member gives the folding trailer more possibilities. However, in actual use, in order to control the weight of the entire vehicle and have good durability, the transmission member needs to be made of aluminum, which increases the production cost of the folding trailer.

[0004] Therefore, it is urgent to design a new steering structure for a folding trailer 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 new steering structure of a folding trailer, comprising: a folding body, a steering rod assembly, the folding body is a gathering type body, one end of the folding body is provided with two steering wheels, the steering rod assembly is movably arranged at one end of the folding body, and is characterized in that at least one side of the bottom of the steering rod assembly is provided with a steering swing arm or the front and rear sides of at least one steering wheel are provided with a steering swing arm, a flexible pull wire is connected between the steering rod assembly and at least one steering wheel, the two ends of the flexible pull wire are connected to the steering swing arm, and the middle part of the flexible pull wire is fixedly wound around the bottom of the steering rod assembly or the horizontal rotating axis of the steering wheel.

[0006] In a preferred embodiment, the direction rod assembly includes: a strut adapter, a direction pull rod, a first strut, and a second strut; the direction pull rod is rotatably connected to the strut adapter, and the direction rod can rotate horizontally relative to the strut adapter, the first strut and the second strut are rotatably arranged at both ends of the strut adapter and are rotatably connected to the strut adapter, and the first strut and the second strut can rotate vertically relative to the strut adapter.

[0007] In a preferred embodiment, the adjacent ends of the first support rod and the second support rod are respectively provided with synchronous teeth, the two synchronous teeth are meshed with each other, and the top of the support rod adapter is also provided with an avoidance hole.

[0008] In a preferred embodiment, the direction pull rod is a telescopic structure, a handle is provided at the top of the direction pull rod, and a folding structure is provided at one end of the direction pull rod connected to the support rod adapter for allowing the direction pull rod to rotate vertically.

[0009] In a preferred embodiment, the folding vehicle body is provided with a limiting device on one end of the direction rod for limiting the vertical rotation of the direction rod.

[0010] In a preferred embodiment, the other steering wheel is a follower universal wheel.

[0011] In a preferred embodiment, there are two flexible pull cables, both ends of each flexible pull cable are respectively connected to the steering swing arm, and the middle parts of the two flexible pull cables are respectively fixed around the horizontal rotating axis of the corresponding steering wheel or the bottom of the steering rod assembly.

[0012] The beneficial effects of the present invention are: by setting up a flexible pull wire to achieve steering control, the setting cost of the structure can be effectively reduced, thereby reducing the production cost of the entire vehicle, and the flexible pull wire has a simpler structure and is more convenient to assemble. At the same time, the flexible pull wire can be made of metal, which has high durability and relatively low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a schematic structural diagram of the present invention;

[0014] Figure 2 is a schematic diagram of the connection of the flexible cable of the present invention;

[0015] Figure 3 is a cross-sectional view of the first support rod and the second support rod of the present invention;

[0016] Figure 4 is a schematic structural diagram of another position of the steering arm of the present invention;

[0017] FIG5 is a diagram of the utility model in a folded state.

[0018] In the picture:

[0019] 10. Folding body; 11. Steering wheel; 12. Flexible pull cable; 13. Steering rod assembly; 131. Strut adapter; 132. First strut; 133. Second strut; 134. Steering rod; 135. Handle; 136. Folding structure; 137. Synchronous gear; 138. Avoidance hole; 14. Limiting device; 15. Steering swing arm. DETAILED DESCRIPTION

[0020] 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.

[0021] 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.

[0022] 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.

[0023] 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.

[0024] 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.

[0025] As shown in Figures 1 to 4, the present invention provides a new steering structure for a foldable trailer, comprising: a foldable body 10, a steering rod assembly 13, wherein the foldable body 10 is a gathered body, one end of the foldable body 10 is provided with two steering wheels 11, and the steering rod assembly 13 is movably arranged at one end of the foldable body 10, characterized in that a steering swing arm 15 is provided on at least one side of the bottom of the steering rod assembly 13 or a steering swing arm 15 is provided on the front and rear sides of at least one of the steering wheels 11, a flexible pull wire 12 is connected between the steering rod assembly 13 and at least one of the steering wheels 11, both ends of the flexible pull wire 12 are connected to the steering swing arm 15, and the middle part of the flexible pull wire 12 is fixedly wound around the bottom of the steering rod assembly 13 or the horizontal rotation axis of the steering wheel 11;

[0026] Specifically, the folding vehicle body 10 can be a folding frame as in the Chinese utility model patent: CN202321879711.1 or a gathering frame as in the Chinese utility model patent: CN202321386183.6, and the folding vehicle body 10 is provided with a power supply, a controller and a motor hub, so that it can be electrified. This is the prior art and therefore will not be described in detail here. One end of the folding vehicle body 10 is provided with two directional wheels, and the other end is provided with two direction wheels 11 for controlling the direction of travel of the folding vehicle body 10. The direction rod assembly 13 is movably provided on one end of the folding vehicle body 10. The direction rod assembly 13 is provided on one end of the folding vehicle body 10. The component 13 can be rotated horizontally relative to the folding body 10, and it is more preferable to make the steering rod component 13 able to rotate vertically relative to the folding body 10 for easy dragging. Preferably, the steering rod component 13 and the steering wheel 11 are at the same end, and a flexible pull wire 12 is provided between the steering rod component 13 and at least one steering wheel 11, wherein a steering swing arm 15 is provided at the bottom of the steering rod component 13 or at the front and rear sides of the steering wheel 11. When a steering swing arm 15 is provided at the front and rear sides of the bottom of the steering rod component 13, the two ends of the flexible pull wire 12 are rotatably connected to the steering swing arm 15, and the head of the flexible pull wire 12 can be rotated horizontally relative to the steering swing arm 15 , the middle part of the flexible pull wire 12 is fixedly wound around the horizontal rotation axis of the steering wheel 11; when the steering wheel 11 is provided with a steering swing arm 15 on the front and rear sides, the two ends of the flexible pull wire 12 are rotatably connected to the steering swing arm 15, and the middle part of the flexible pull wire 12 is fixedly wound around the bottom of the steering rod assembly 13; when the steering rod assembly 13 is only provided with a steering swing arm 15 on the front or rear side of the bottom, the two ends of the flexible pull wire 12 are rotatably connected to the steering swing arm 15 respectively, and the flexible pull wire 12 surrounds the two steering wheels 11 and is fixedly connected to the place where it contacts the horizontal rotation axis of the steering wheel 11. Regardless of which of the above methods is used When the steering rod assembly 13 rotates horizontally, it will drive the steering wheel 11 connected thereto to rotate synchronously. When the steering rod assembly 13 is only connected to one steering wheel 11, the other steering wheel 11 can be set as a follower universal wheel. When the steering rod assembly 13 turns left, it drives the steering wheel 11 connected thereto to turn left. At this time, the folding body 10 will generate a force to turn left on the follower universal wheel, so that the follower universal wheel will turn left by itself under the influence of the force, thereby achieving the turning effect. Moreover, due to the soft characteristics of the flexible pull wire 12, it can also bend as the folding body 10 is folded for easy storage.

[0027] Furthermore, the direction rod assembly 13 includes: a strut adapter 131, a direction pull rod 134, a first strut 132, and a second strut 133; the direction pull rod 134 is rotatably connected to the strut adapter 131, and the direction rod can rotate horizontally relative to the strut adapter 131; the first strut 132 and the second strut 133 are rotatably disposed at both ends of the strut adapter 131 and are rotatably connected to the strut adapter 131; the first strut 132 and the second strut 133 can rotate vertically relative to the strut adapter 131;

[0028] Specifically, one end of the first strut 132 and the second strut 133 are respectively rotatably connected to the connecting seats on both sides of the folding body 10, and the first strut 132 and the second strut 133 can rotate vertically relative to the connecting seat, and the strut adapter 131 is arranged between the first strut 132 and the second strut 133, and the first strut 132 and the second strut 133 adjacent to the strut adapter 131 are respectively rotatably connected to the strut adapter 131, and the first strut 132 and the second strut 133 can rotate vertically relative to the strut adapter 131, and the bottom end of the direction pull rod 134 rotates horizontally with the strut adapter 131. When the folding body 10 is folded, the first strut 132 and the second strut 133 are respectively rotated vertically relative to the folding body 10 to lift the strut adapter 131, driving the direction pull rod 134 to rise, so that the first strut 132 and the second strut 133 support the direction pull rod 134 without affecting the folding of the folding body 10.

[0029] Furthermore, the adjacent ends of the first support rod 132 and the second support rod 133 are respectively provided with synchronous teeth 137, and the two synchronous teeth 137 are meshed with each other. The top of the support rod adapter 131 is also provided with an avoidance hole 138;

[0030] Specifically, since the first support rod 132 and the second support rod 133 are connected together through the support rod adapter 131, and the first support rod 132 and the second support rod 133 can rotate relative to the support rod adapter 131, when the first support rod 132 and the second support rod 133 rotate relative to the support rod adapter 131, the first support rod 132 and the second support rod 133 may move out of sync, which will cause the support rod adapter 131 to tilt, thereby driving the direction rod 134 to tilt. To avoid this situation, synchronous teeth 137 are respectively provided on the adjacent ends of the first support rod 132 and the second support rod 133. The two synchronous teeth 137 are engaged with each other. When one of the support rods 132 and 133 rotates relative to the support rod adapter 131, the first support rod 132 and the second support rod 133 may move out of sync. When rotating, it synchronously drives another strut, thereby avoiding different situations of the two struts, and further avoiding the direction pull rod 134 from tilting when folding; at the same time, since the two synchronous teeth 137 will be driven to rise when the first strut 132 and the second strut 133 rotate, the synchronous teeth 137 will contact the top wall of the strut adapter 131. In order to avoid the first strut 132 and the second strut 133 being unable to rotate due to the restriction of the strut adapter 131, an avoidance hole 138 is opened on the top wall of the strut adapter 131. When the first strut 132 and the second strut 133 rotate, the end of the synchronous tooth 137 passes through the avoidance hole 138 and goes out of the strut adapter 131.

[0031] Furthermore, the direction rod 134 is a telescopic structure, a handle 135 is provided at the top of the direction rod, and a folding structure 136 is provided at one end of the direction rod 134 connected to the support rod adapter 131 for allowing the direction rod 134 to rotate vertically.

[0032] Specifically, the steering rod 134 adopts a telescopic structure, so that it has length adjustment. When installed at one end of the folding body 10, the height can be adjusted. A handle 135 is also provided at the top of the steering rod 134. The handle 135 is convenient for the user to hold. A number of control buttons are also provided on the handle 135. The functions of the control buttons include but are not limited to: horn, turn signal, vehicle start, forward / reverse, speed control, braking, etc., wherein the brake can be an electronic brake or a mechanical brake, such as a disc brake, drum brake, etc.; the speed control can adopt a traditional electric vehicle accelerator handle 135 or a finger dial. The control principles are all existing conventional technologies and will not be described in detail here. At the same time, to facilitate the user to tow the folding body 10, a folding structure 136 is further provided on the end of the steering rod 134 connected to the support rod adapter 131. The folding structure 136 can enable the steering rod 134 to rotate vertically without affecting the steering control. Therefore, when the user needs to tow the folding body 10, the steering rod 134 can be folded down to tilt it, thereby improving the convenience of towing.

[0033] Furthermore, the folding body 10 is provided with a limit device 14 at one end of the direction rod 134 for limiting the vertical rotation of the direction rod 134;

[0034] Specifically, since a folding structure 136 is provided on the direction pull rod 134, in order to prevent the direction pull rod 134 from folding when it is not needed to fold, a limiting device 14 for fixing the direction pull rod 134 is also provided on the folding body 10. When the direction pull rod 134 is not needed to fold, the direction pull rod 134 can be placed in the limiting device 14, and the direction pull rod 134 can be restricted by the limiting device 14 to prevent it from rotating. It should be pointed out that the limiting device 14 can completely restrict the direction pull rod 134, rather than detaching from the limiting device 14 when subjected to a certain force.

[0035] Furthermore, in this embodiment, two flexible cables 12 are provided, and both ends of each flexible cable 12 are connected to the direction swing arm 15 respectively, and the middle parts of the two flexible cables 12 are fixedly wound around the horizontal rotation axis of the corresponding direction wheel 11 or the bottom of the direction rod assembly 13;

[0036] Specifically, in order to improve the steering stability, two flexible cables 12 are provided, and the two ends of the two flexible cables 12 are respectively connected to the steering swing arm 15 for rotation, and the middle parts of the two flexible cables 12 are fixedly wound around the bottom end of the steering rod 134 or the horizontal rotation axis of the two steering wheels 11, that is, when the steering swing arm 15 is provided at the bottom of the steering rod 134, the middle part of the flexible cable 12 is fixedly wound around the horizontal rotation axis of the steering wheel 11, and when the steering swing arm 15 is provided on the two steering wheels 11, the middle part of the flexible cable 12 is fixedly wound around the bottom of the steering rod 134; at this time, when the steering rod 134 rotates, it drives the two steering wheels 11 to rotate at the same time, thereby improving the steering stability of the folding body 10.

[0037] It should be noted that, if the Ackerman steering effect is to be achieved, the shaft around which the flexible cables 12 are wound may be set to an irregular shape so that the movement strokes of the two flexible cables 12 are inconsistent when the flexible cables 12 are rotated.

[0038] To sum up, the present application can achieve steering control through the setting of the flexible pull wire 12 while effectively reducing the setting cost of the structure, thereby reducing the production cost of the entire vehicle. The flexible pull wire 12 has a simpler structure and is more convenient to assemble. At the same time, the flexible pull wire 12 can be made of metal, which has high durability and relatively low cost.

[0039] 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 novel steering structure for a folding trailer, comprising: A folding body and a steering rod assembly, wherein the folding body is a gathering type body, two steering wheels are provided at one end of the folding body, and the steering rod assembly is movably arranged at one end of the folding body, and is characterized in that a steering swing arm is provided on at least one side of the bottom of the steering rod assembly or a steering swing arm is provided on the front and rear sides of at least one steering wheel, a flexible pull wire is connected between the steering rod assembly and at least one steering wheel, both ends of the flexible pull wire are connected to the steering swing arm, and the middle part of the flexible pull wire is fixedly wound around the bottom of the steering rod assembly or the horizontal rotating axis of the steering wheel.

2. The novel steering structure of the folding trailer according to claim 1 is characterized in that: The direction rod assembly includes: a strut adapter, a direction pull rod, a first strut, and a second strut; the direction pull rod is rotatably connected to the strut adapter, and the direction rod can rotate horizontally relative to the strut adapter; the first strut and the second strut are rotatably arranged at both ends of the strut adapter and are rotatably connected to the strut adapter; the first strut and the second strut can rotate vertically relative to the strut adapter.

3. The novel steering structure of the folding trailer according to claim 2 is characterized in that: The adjacent ends of the first support rod and the second support rod are respectively provided with synchronous teeth, and the two synchronous teeth are meshed with each other. The top of the support rod adapter is also provided with an avoidance hole.

4. The novel steering structure of the folding trailer according to claim 2, characterized in that: The direction pull rod is a telescopic structure, a handle is provided at the top end of the direction pull rod, and a folding structure for allowing the direction pull rod to rotate vertically is also provided at one end of the direction pull rod connected to the support rod adapter.

5. The novel steering structure of the folding trailer according to claim 2, characterized in that: The folding vehicle body is provided with a limiting device at one end of the direction rod for limiting the vertical rotation of the direction rod.

6. The novel steering structure of the folding trailer according to claim 1, characterized in that: The other steering wheel is a follower universal wheel.

7. The novel steering structure of the folding trailer according to claim 1, characterized in that: There are two flexible pull cables, both ends of each flexible pull cable are connected to the direction swing arm respectively, and the middle parts of the two flexible pull cables are fixedly wound around the horizontal rotation axis of the corresponding direction wheel or the bottom of the direction rod assembly.

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