Rear wheel steering adjusting mechanism and vehicle

Abstract

The invention discloses a rear wheel steering adjusting mechanism and a vehicle. The middle fulcrum support is hinged to the middle of the angle adjusting rotating plate through the fulcrum rotating shaft, and the first steering adjusting column and the second steering adjusting column which are adjustable in length are arranged on the two sides, located on the fulcrum rotating shaft, of the middle fulcrum support to support the angle adjusting face, facing the middle fulcrum support, of the angle adjusting rotating plate. The included angle of the angle adjusting rotating plate relative to the rear fork shaft is controlled, the angle between the first rear wheel support and the first hinge connecting rod and the angle between the second rear wheel support and the second hinge connecting rod are driven to be adjusted, and therefore the included angle between the first rear wheel support and the second rear wheel support relative to the rear fork shaft can be adjusted. The steering angles of the rear wheels arranged on the first rear wheel support and the second rear wheel support are controlled, the steering angles of the rear wheels are adjusted after the whole vehicle is assembled, and adaptability is high.

Description

Technical Field

[0001] This application relates to the technical field of vehicles, and particularly relates to a rear-wheel steering adjustment mechanism and a vehicle. Background Art

[0002] The rear-wheel steering systems of currently commercially available vehicles generally have problems of lack of adjustment function or overly complex operation. Taking an electric pedal tricycle as an example, after the whole vehicle is assembled, the rear-wheel steering angle is in a fixed state. It is neither possible to dynamically adjust the rear-wheel steering angle according to the assembly situation, nor is there a necessary mechanical adjustment interface. This technical bottleneck directly affects the flexibility of angle adjustment and the scene adaptability of the rear-wheel steering angle of the vehicle. Summary of the Invention

[0003] The embodiments of this application provide a rear-wheel steering adjustment mechanism and a vehicle, which can solve the technical problem that the rear-wheel steering angle of a vehicle cannot be adjusted after the vehicle is assembled into a whole vehicle.

[0004] The embodiments of this application provide a rear-wheel steering adjustment mechanism, including a rear fork shaft, a first rear-wheel bracket, a second rear-wheel bracket, a middle fulcrum bracket, an angle adjustment rotating plate, a fulcrum rotating shaft, a first articulated link, a second articulated link, a first steering adjustment column, and a second steering adjustment column;

[0005] Both ends of the rear fork shaft are respectively connected to the ends of the first rear-wheel bracket and the second rear-wheel bracket, and the middle of the rear fork shaft is connected to the first end of the middle fulcrum bracket. The middle fulcrum bracket, the first rear-wheel bracket, and the second rear-wheel bracket are located on the same side of the rear fork shaft;

[0006] The second end of the middle fulcrum bracket is articulated to the middle of the angle adjustment rotating plate through the fulcrum rotating shaft. An angle adjustment surface is provided on one side of the angle adjustment rotating plate facing the middle fulcrum bracket. One end of the first articulated link is articulated to the middle of the first rear-wheel bracket, and the other end of the first articulated link is articulated to the side of the angle adjustment rotating plate adjacent to the first rear-wheel bracket. One end of the second articulated link is articulated to the middle of the second rear-wheel bracket, and the other end of the second articulated link is articulated to the side of the angle adjustment rotating plate adjacent to the second rear-wheel bracket. The first steering adjustment column and the second steering adjustment column are respectively adjustably connected to the second end of the middle fulcrum bracket. The first steering adjustment column and the second steering adjustment column are respectively located on both sides of the fulcrum rotating shaft, and the first steering adjustment column and the second steering adjustment column respectively abut against the angle adjustment surface. By adjusting the lengths of the first steering adjustment column and the second steering adjustment column, the included angle of the angle adjustment rotating plate relative to the rear fork shaft is controlled, driving the adjustment of the angles of the first rear-wheel bracket and the first articulated link and the adjustment of the angles of the second rear-wheel bracket and the second articulated link.

[0007] Further, the second end of the middle fulcrum bracket is respectively provided with a first threaded hole and a second threaded hole on both sides corresponding to the fulcrum rotating shaft, the first steering adjustment column is threadedly connected into the first threaded hole, and the second steering adjustment column is threadedly connected into the second threaded hole.

[0008] Further, both the first steering adjustment column and the second steering adjustment column include fasteners.

[0009] Further, the angle adjustment surface respectively includes a first inclined surface and a second inclined surface on both sides of the fulcrum rotating shaft, the first steering adjustment column abuts against the first inclined surface, and the second steering adjustment column abuts against the second inclined surface.

[0010] Further, the middle part of the rear fork shaft is fixedly connected to the first end of the middle fulcrum bracket, the end of the first rear wheel bracket is provided with a first through hole, the end of the second rear wheel bracket is provided with a second through hole, and both ends of the rear fork shaft respectively pass through the first through hole and the second through hole and are connected to nuts.

[0011] Further, the angle adjustment rotating plate includes an upper connecting plate, a lower connecting plate and a middle connecting plate, the upper connecting plate and the lower connecting plate are arranged in parallel, the lower connecting plate is provided with the angle adjustment surface, the upper connecting plate and the lower connecting plate are connected with the fulcrum rotating shaft in the middle of the side facing the angle adjustment surface, the second end of the middle fulcrum bracket protrudes to be provided with a hinge plate, the hinge plate is provided with a rotating through hole, the hinge plate extends between the upper connecting plate and the lower connecting plate, and the fulcrum rotating shaft passes through the rotating through hole and is rotatably connected to the hinge plate.

[0012] Further, the angle adjustment rotating plate further includes a first rotating shaft and a second rotating shaft, the upper connecting plate and the lower connecting plate are connected with the first rotating shaft on the side facing the first rear wheel bracket, the other end of the first hinge connecting rod is provided with a first hinge through hole, the other end of the first hinge connecting rod extends between the upper connecting plate and the lower connecting plate, the first rotating shaft passes through the first hinge through hole and is rotatably connected to the first hinge connecting rod, the upper connecting plate and the lower connecting plate are connected with the second rotating shaft on the side facing the second rear wheel bracket, the other end of the second hinge connecting rod is provided with a second hinge through hole, the other end of the second hinge connecting rod extends between the upper connecting plate and the lower connecting plate, and the second rotating shaft passes through the second hinge through hole and is rotatably connected to the second hinge connecting rod.

[0013] Further, the rear-wheel steering adjustment mechanism further includes a first rear wheel and a second rear wheel. The first rear wheel is connected to one end of the first rear-wheel bracket away from the rear fork shaft, and the second rear wheel is connected to one end of the second rear-wheel bracket away from the rear fork shaft. The angle adjustment rotating plate is located between the first rear wheel and the second rear wheel.

[0014] Further, the rear-wheel steering adjustment mechanism further includes a buffer bracket and an elastic buffer device. The buffer bracket is connected to the upper surface of the middle fulcrum bracket. The bottom of the elastic buffer device is connected to the buffer bracket, and the top of the elastic buffer device is connected to the vehicle body.

[0015] The embodiment of the present application also provides a vehicle, including the rear-wheel steering adjustment mechanism described above.

[0016] In the rear-wheel steering adjustment mechanism and the vehicle provided by the embodiment of the present application, the middle fulcrum bracket is hinged to the middle of the angle adjustment rotating plate through a fulcrum rotating shaft. On both sides of the middle fulcrum bracket with respect to the fulcrum rotating shaft, a first steering adjustment column and a second steering adjustment column with adjustable lengths are provided to support the angle adjustment surface of the angle adjustment rotating plate facing the middle fulcrum bracket, so as to control the included angle of the angle adjustment rotating plate relative to the rear fork shaft, drive the adjustment of the angles of the first rear-wheel bracket and the first articulated connecting rod, and the adjustment of the angles of the second rear-wheel bracket and the second articulated connecting rod. In this way, the included angles of the first rear-wheel bracket and the second rear-wheel bracket relative to the rear fork shaft can be adjusted to control the steering angles of the rear wheels provided on the first rear-wheel bracket and the second rear-wheel bracket. Description of the Drawings

[0017] The following will, in conjunction with the drawings, make the technical solutions and other beneficial effects of the present application obvious through a detailed description of the specific embodiments of the present application.

[0018] Figure 1 It is a schematic structural diagram of the rear-wheel steering adjustment mechanism provided by the embodiment of the present application.

[0019] Figure 2 It is a partial schematic structural diagram of the rear-wheel steering adjustment mechanism provided by the embodiment of the present application.

[0020] Figure 3 It is Figure 2 A partial structural explosion diagram of the provided rear-wheel steering adjustment mechanism.

[0021] Figure 4 It is a partial structural cross-sectional view of the rear-wheel steering adjustment mechanism provided by the embodiment of the present application.

[0022] Figure 5 It is a schematic structural diagram of the angle adjustment rotating plate connecting the fulcrum rotating shaft provided by the embodiment of the present application.

[0023] Figure 6This is a schematic structural diagram of the steering adjustment part of the rear-wheel steering adjustment mechanism provided by the embodiments of the present application.

[0024] The markings in the figure are as follows:

[0025] Rear fork shaft 1, first rear-wheel bracket 2, first through hole 21, second rear-wheel bracket 3, second through hole 31, middle fulcrum bracket 4, first threaded hole 41, second threaded hole 42, hinge plate 43, rotation through hole 431, angle adjustment rotating plate 5, angle adjustment surface 51, first inclined surface 511, second inclined surface 512, upper connecting plate 52, lower connecting plate 53, middle connecting plate 54, first rotating shaft 55, second rotating shaft 56, fulcrum rotating shaft 6, first hinge connecting rod 7, second hinge connecting rod 8, first steering adjustment column 9, second steering adjustment column 10, nut 11, first rear wheel 12, second rear wheel 13, buffer bracket 14, elastic buffer device 15, elastic buffer sleeve 16. Specific embodiments

[0026] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present application.

[0027] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or can communicate with each other; it can be directly connected, or indirectly connected through an intermediate medium, and can be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0028] In the present application, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but through other features between them. Moreover, the first feature being "above", "over", and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely means that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "under", and "beneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely means that the horizontal height of the first feature is lower than that of the second feature.

[0029] Specifically, please refer to Figure 1 、Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , embodiments of the present application provide a rear-wheel steering adjustment mechanism. The rear-wheel steering adjustment mechanism includes a rear fork shaft 1, a first rear-wheel bracket 2, a second rear-wheel bracket 3, a middle fulcrum bracket 4, an angle adjustment turntable 5, a fulcrum rotating shaft 6, a first articulated connecting rod 7, a second articulated connecting rod 8, a first steering adjustment column 9, and a second steering adjustment column 10.

[0030] Both ends of the rear fork shaft 1 are respectively connected to the ends of the first rear-wheel bracket 2 and the second rear-wheel bracket 3. The middle of the rear fork shaft 1 is connected to the first end of the middle fulcrum bracket 4. The middle fulcrum bracket 4, the first rear-wheel bracket 2, and the second rear-wheel bracket 3 are located on the same side of the rear fork shaft 1.

[0031] The second end of the middle fulcrum bracket 4 is hinged to the middle of the angle adjustment turntable 5 through the fulcrum rotating shaft 6. An angle adjustment surface 51 is provided on the side of the angle adjustment turntable 5 facing the middle fulcrum bracket 4. One end of the first articulated connecting rod 7 is hinged to the middle of the first rear-wheel bracket 2, and the other end of the first articulated connecting rod 7 is hinged to the side of the angle adjustment turntable 5 adjacent to the first rear-wheel bracket 2. One end of the second articulated connecting rod 8 is hinged to the middle of the second rear-wheel bracket 3, and the other end of the second articulated connecting rod 8 is hinged to the side of the angle adjustment turntable 5 adjacent to the second rear-wheel bracket 3. The first steering adjustment column 9 and the second steering adjustment column 10 are respectively adjustably connected to the second end of the middle fulcrum bracket 4. The first steering adjustment column 9 and the second steering adjustment column 10 are respectively located on both sides of the fulcrum rotating shaft 6. The first steering adjustment column 9 and the second steering adjustment column 10 are respectively abutted against the angle adjustment surface 51. By adjusting the lengths of the first steering adjustment column 9 and the second steering adjustment column 10, the included angle of the angle adjustment turntable 5 relative to the rear fork shaft 1 is controlled, driving the adjustment of the angles of the first rear-wheel bracket 2 and the first articulated connecting rod 7 and the adjustment of the angles of the second rear-wheel bracket 3 and the second articulated connecting rod 8.

[0032] In this application, the middle fulcrum bracket 4 is hinged to the middle of the angle adjustment turntable 5 through the fulcrum rotating shaft 6. On both sides of the middle fulcrum bracket 4 located on both sides of the fulcrum rotating shaft 6, the first steering adjustment column 9 and the second steering adjustment column 10 with adjustable lengths are provided to support the angle adjustment surface 51 of the angle adjustment turntable 5 facing the middle fulcrum bracket 4, so as to control the included angle of the angle adjustment turntable 5 relative to the rear fork shaft 1, drive the adjustment of the angles of the first rear wheel bracket 2 and the first articulated link 7 and the adjustment of the angles of the second rear wheel bracket 3 and the second articulated link 8. In this way, the included angles of the first rear wheel bracket 2 and the second rear wheel bracket 3 relative to the rear fork shaft 1 can be adjusted to control the steering angles of the rear wheels arranged on the first rear wheel bracket 2 and the second rear wheel bracket 3.

[0033] It can be understood that the rear fork shaft 1 is connected to the middle fulcrum bracket 4, and both ends of the rear fork shaft 1 are respectively connected to the ends of the first rear wheel bracket 2 and the second rear wheel bracket 3. In this way, the rear fork shaft 1, the middle fulcrum bracket 4, the first rear wheel bracket 2 and the second rear wheel bracket 3 are located in a first plane. Then, both sides of the angle adjustment turntable 5 are respectively hinged to the middle parts of the first rear wheel bracket 2 and the second rear wheel bracket 3 through the first articulated link 7 and the second articulated link 8. The steering angles of the rear wheels arranged on the first rear wheel bracket 2 and the second rear wheel bracket 3 can be adjusted and controlled by adjusting the distance between the angle adjustment turntable 5 and the first rear wheel bracket 2 and the second rear wheel bracket 3.

[0034] To achieve structural stability, the second end of the middle fulcrum bracket 4 is hinged to the middle of the angle adjustment turntable 5 through the fulcrum rotating shaft 6. In this way, the first articulated link 7, the second articulated link 8 and the angle adjustment turntable 5 are also located in the first plane, and the middle fulcrum bracket 4 and the angle adjustment turntable 5 are not separated from each other.

[0035] To facilitate the adjustment of the steering angles of the rear wheels on the first rear wheel bracket 2 and the second rear wheel bracket 3, the first steering adjustment column 9 and the second steering adjustment column 10 are respectively located on both sides of the fulcrum rotating shaft 6. The first steering adjustment column 9 and the second steering adjustment column 10 are respectively abutted against the angle adjustment surface 51. By adjusting the lengths of the first steering adjustment column 9 and the second steering adjustment column 10, the included angle of the angle adjustment turntable 5 relative to the middle fulcrum bracket 4 can be controlled. When adjusting the included angle, it is necessary to synchronously reduce the length of the second steering adjustment column 10 when increasing the length of the first steering adjustment column 9, and it is necessary to synchronously increase the length of the second steering adjustment column 10 when reducing the length of the first steering adjustment column 9.

[0036] Such as Figure 3 、 Figure 4As shown, on both sides of the corresponding pivot shaft 6, the second end of the middle pivot bracket 4 is respectively provided with a first threaded hole 41 and a second threaded hole 42. The first steering adjustment column 9 is threadedly connected into the first threaded hole 41, and the second steering adjustment column 10 is threadedly connected into the second threaded hole 42. The lengths of the first steering adjustment column 9 and the second steering adjustment column 10 can be conveniently adjusted by means of threaded connection.

[0037] Furthermore, both the first steering adjustment column 9 and the second steering adjustment column 10 include fasteners. The fasteners are preferably studs, bolts or screws. By adjusting the engagement depth of the first steering adjustment column 9 and the second steering adjustment column 10 for angle adjustment, users can adjust at any time according to different scenarios or their own needs, and the adjustment is relatively convenient and fast.

[0038] As Figure 5 、 Figure 6 shown, on both sides of the pivot shaft 6, the angle adjustment surface 51 respectively includes a first inclined surface 511 and a second inclined surface 512. The first steering adjustment column 9 abuts against the first inclined surface 511, and the second steering adjustment column 10 abuts against the second inclined surface 512. The first inclined surface 511 and the second inclined surface 512 are obtuse angles, and the range of the obtuse angle is from 120 degrees to 179 degrees. By adjusting the lengths of the first steering adjustment column 9 and the second steering adjustment column 10, the angle adjustment rotating plate 5 can be effectively controlled to rotate relative to the middle pivot bracket 4 along the pivot shaft 6, and the included angle between the first rear wheel bracket 2 and the second rear wheel bracket 3 relative to the rear fork shaft 1 can be controlled by means of articulated drive.

[0039] As Figure 2 、 Figure 3 、 Figure 4 shown, the middle part of the rear fork shaft 1 is fixedly connected to the first end of the middle pivot bracket 4. The end of the first rear wheel bracket 2 is provided with a first through hole 21, and the end of the second rear wheel bracket 3 is provided with a second through hole 31. Both ends of the rear fork shaft 1 respectively pass through the first through hole 21 and the second through hole 31 and are connected to nuts 11. In this way, the included angle between the first rear wheel bracket 2 and the second rear wheel bracket 3 relative to the rear fork shaft 1 can be made variable.

[0040] As Figure 4As shown, in order to prevent the external threads at the ends of the rear fork shaft 1 from wearing against the first through hole 21 and the second through hole 31, and to maintain the variable angle between the first rear wheel bracket 2 and the second rear wheel bracket 3 relative to the rear fork shaft 1, an elastic buffer sleeve 16 is further provided at the ends of the rear fork shaft 1. When the angle is adjusted by adjusting the engagement depth of the first steering adjustment column 9 and the second steering adjustment column 10, the elastic buffer sleeve 16 can adapt to the angle change during adjustment through deformation.

[0041] External threads are provided at both ends of the rear fork shaft 1. Both ends of the rear fork shaft 1 respectively pass through the first through hole 21 and the second through hole 31 and are sleeved with elastic buffer sleeves 16. Both ends of the rear fork shaft 1 are threadedly connected to nuts 11, and the nuts 11 press the elastic buffer sleeves 16 in the first through hole 21 and the second through hole 31. The middle of the rear fork shaft 1 is connected to the first end of the middle fulcrum bracket 4. Specifically, a connection through hole is provided at the first end of the middle fulcrum bracket 4, and the middle of the rear fork shaft 1 is fixedly connected into the connection through hole.

[0042] As Figure 5 、 Figure 6 shown, the angle adjustment turntable 5 includes an upper connection plate 52, a lower connection plate 53, and a middle connection plate 54. The upper connection plate 52 and the lower connection plate 53 are arranged in parallel. The lower connection plate 53 is provided with the angle adjustment surface 51. The upper connection plate 52 and the lower connection plate 53 are connected to the fulcrum rotating shaft 6 in the middle on the side facing the angle adjustment surface 51. The second end of the middle fulcrum bracket 4 protrudes to be provided with a hinge plate 43. The hinge plate 43 is provided with a rotation through hole 431. The hinge plate 43 extends between the upper connection plate 52 and the lower connection plate 53, and the fulcrum rotating shaft 6 passes through the rotation through hole 431 and is rotatably connected to the hinge plate 43.

[0043] As Figure 5 、 Figure 6As shown, the angle adjustment rotating plate 5 further includes a first rotating shaft 55 and a second rotating shaft 56. The upper connecting plate 52 and the lower connecting plate 53 are connected with the first rotating shaft 55 at the side facing the first rear wheel bracket 2. The other end of the first articulated link 7 is provided with a first articulated through hole. The other end of the first articulated link 7 extends between the upper connecting plate 52 and the lower connecting plate 53. The first rotating shaft 55 passes through the first articulated through hole and is rotatably connected with the first articulated link 7. The upper connecting plate 52 and the lower connecting plate 53 are connected with the second rotating shaft 56 at the side facing the second rear wheel bracket 3. The other end of the second articulated link 8 is provided with a second articulated through hole. The other end of the second articulated link 8 extends between the upper connecting plate 52 and the lower connecting plate 53. The second rotating shaft 56 passes through the second articulated through hole and is rotatably connected with the second articulated link 8.

[0044] As Figure 1 shown, the rear wheel steering adjustment mechanism further includes a first rear wheel 12 and a second rear wheel 13. The first rear wheel 12 is connected to the end of the first rear wheel bracket 2 away from the rear fork shaft 1. The second rear wheel 13 is connected to the end of the second rear wheel bracket 3 away from the rear fork shaft 1. The angle adjustment rotating plate 5 is located between the first rear wheel 12 and the second rear wheel 13.

[0045] As Figure 1 shown, the rear wheel steering adjustment mechanism further includes a buffer bracket 14 and an elastic buffer device 15. The buffer bracket 14 is connected to the upper surface of the middle fulcrum bracket 4. The bottom of the elastic buffer device 15 is connected to the buffer bracket 14. The top of the elastic buffer device 15 is connected to the vehicle body. Such a setting can make the vehicle body structure compact and have a buffering effect, and can effectively support the bottom of the vehicle body.

[0046] The embodiment of the present application further provides a vehicle, including the rear wheel steering adjustment mechanism described above.

[0047] Preferably, the vehicle includes an electric pedal tricycle.

[0048] The rear-wheel steering adjustment mechanism and vehicle provided by the embodiments of the present application are configured such that the middle fulcrum bracket is hinged to the middle of the angle adjustment rotating plate through a fulcrum rotating shaft. On both sides of the fulcrum rotating shaft of the middle fulcrum bracket, first and second steering adjustment columns with adjustable lengths are provided to support the angle adjustment surface of the angle adjustment rotating plate facing the middle fulcrum bracket, thereby controlling the included angle of the angle adjustment rotating plate relative to the rear fork shaft, driving the adjustment of the angles of the first rear-wheel bracket and the first articulated link, and the adjustment of the angles of the second rear-wheel bracket and the second articulated link. In this way, the included angles of the first rear-wheel bracket and the second rear-wheel bracket relative to the rear fork shaft can be adjusted to control the steering angles of the rear wheels provided on the first rear-wheel bracket and the second rear-wheel bracket, and the steering angles of the rear wheels can be adjusted after the vehicle assembly is completed, with strong adaptability.

[0049] In the above embodiments, the descriptions of the various embodiments have their own emphases. For parts not detailed in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0050] The above has introduced in detail a rear-wheel steering adjustment mechanism and vehicle provided by the embodiments of the present application. Specific examples are used in this article to elaborate on the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the technical solution and its core idea of the present application; those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A rear wheel steering adjustment mechanism, characterized in that: include: A rear fork shaft, a first rear wheel bracket, a second rear wheel bracket, a middle fulcrum bracket, an angle adjustment rotating plate, a fulcrum rotating shaft, a first hinge connecting rod, a second hinge connecting rod, a first steering adjustment column, and a second steering adjustment column; Two ends of the rear fork shaft are respectively connected to the ends of the first rear wheel bracket and the second rear wheel bracket, the middle part of the rear fork shaft is connected to the first end of the middle fulcrum bracket, and the middle fulcrum bracket, the first rear wheel bracket and the second rear wheel bracket are located on the same side of the rear fork shaft; The second end of the middle fulcrum bracket is hinged to the middle of the angle adjustment rotating plate through the fulcrum rotating shaft, and the angle adjustment rotating plate is provided with an angle adjustment surface on one side facing the middle fulcrum bracket. One end of the first hinged link is hinged to the middle of the first rear wheel bracket, and the other end of the first hinged link is hinged to the side of the angle adjustment rotating plate adjacent to the first rear wheel bracket. One end of the second hinged link is hinged to the middle of the second rear wheel bracket, and the other end of the second hinged link is hinged to the side of the angle adjustment rotating plate adjacent to the second rear wheel bracket. The first steering adjustment column and the second steering adjustment column are respectively adjustably connected to the second end of the middle fulcrum bracket. The first steering adjustment column and the second steering adjustment column are respectively located on both sides of the fulcrum rotating shaft. The first steering adjustment column and the second steering adjustment column are respectively abutted against the angle adjustment surface. The angle of the angle adjustment rotating plate relative to the rear fork shaft is controlled by adjusting the length of the first steering adjustment column and the second steering adjustment column, so as to drive the adjustment of the angle between the first rear wheel bracket and the first hinged link and the adjustment of the angle between the second rear wheel bracket and the second hinged link.

2. The rear wheel steering adjustment mechanism according to claim 1, characterized in that: The second end of the middle fulcrum bracket is respectively provided with a first threaded hole and a second threaded hole on both sides corresponding to the fulcrum shaft, the first steering adjustment column is threadedly connected to the first threaded hole, and the second steering adjustment column is threadedly connected to the second threaded hole.

3. The rear wheel steering adjustment mechanism according to claim 2, characterized in that: The first steering adjustment column and the second steering adjustment column each include a fastener.

4. The rear wheel steering adjustment mechanism according to claim 1, characterized in that: The angle adjustment surface includes a first inclined surface and a second inclined surface on both sides of the fulcrum shaft, respectively. The first steering adjustment column abuts against the first inclined surface, and the second steering adjustment column abuts against the second inclined surface.

5. The rear wheel steering adjustment mechanism according to claim 1, characterized in that: The middle part of the rear fork shaft is fixedly connected to the first end of the middle fulcrum bracket, the end of the first rear wheel bracket is provided with a first through hole, the end of the second rear wheel bracket is provided with a second through hole, and the two ends of the rear fork shaft respectively pass through the first through hole and the second through hole and are connected to nuts.

6. The rear wheel steering adjustment mechanism according to claim 1, characterized in that: The angle adjustment rotating plate includes an upper connecting plate, a lower connecting plate and a middle connecting plate, the upper connecting plate and the lower connecting plate are arranged in parallel, the lower connecting plate is provided with the angle adjustment surface, the upper connecting plate and the lower connecting plate are connected with the fulcrum rotating shaft in the middle part of the side facing the angle adjustment surface, a hinge plate is protruded from the second end of the middle fulcrum bracket, the hinge plate is provided with a rotating through hole, the hinge plate extends between the upper connecting plate and the lower connecting plate, and the fulcrum rotating shaft passes through the rotating through hole and is rotatably connected to the hinge plate.

7. The rear wheel steering adjustment mechanism according to claim 6, characterized in that: The angle adjustment rotating plate also includes a first rotating shaft and a second rotating shaft, the upper connecting plate and the lower connecting plate are connected with the first rotating shaft on the side facing the first rear wheel bracket, the other end of the first hinged link is provided with a first hinge through hole, the other end of the first hinged link extends between the upper connecting plate and the lower connecting plate, the first rotating shaft passes through the first hinge through hole and is rotatably connected to the first hinged link, the upper connecting plate and the lower connecting plate are connected with the second rotating shaft on the side facing the second rear wheel bracket, the other end of the second hinged link is provided with a second hinge through hole, the other end of the second hinged link extends between the upper connecting plate and the lower connecting plate, the second rotating shaft passes through the second hinge through hole and is rotatably connected to the second hinged link.

8. The rear wheel steering adjustment mechanism according to claim 1, characterized in that: The rear wheel steering adjustment mechanism also includes a first rear wheel and a second rear wheel, the first rear wheel is connected to an end of the first rear wheel bracket away from the rear fork axis, the second rear wheel is connected to an end of the second rear wheel bracket away from the rear fork axis, and the angle adjustment rotating plate is located between the first rear wheel and the second rear wheel.

9. The rear wheel steering adjustment mechanism according to claim 1, characterized in that: The rear wheel steering adjustment mechanism also includes a buffer bracket and an elastic buffer device, wherein the buffer bracket is connected to the upper surface of the middle fulcrum bracket, the bottom of the elastic buffer device is connected to the buffer bracket, and the top of the elastic buffer device is connected to the vehicle body.

10. A vehicle, characterized in that: It comprises the rear wheel steering adjustment mechanism as described in any one of claims 1 to 9.

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