Training wheel assembly and bicycle

Abstract

This application relates to a training wheel assembly (10) and a bicycle. The training wheel assembly (10) includes a mounting base (100) and a holder (200). The mounting base (100) is used to be attached to the bicycle body frame. A mounting hole (101) is provided through the mounting base (100). The holder (200) has a first end (210) and a second end (220). A training wheel (300) is rotatably connected to the first end (210). A mounting hole (101) is provided through either one of the second end (220) and the mounting base (100). The other of the second end (220) and the mounting base (100) is configured to enter into the mounting hole (101) from any opening of the mounting hole (101) and be engaged therewith.

Description

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[0006]

[0001] This application claims the priority of a Chinese patent application with application number 2022218863547 and title "Training Wheel Assembly and Bicycle", filed on July 20, 2022, the entire content of which is incorporated herein by reference.

Technical Field

[0002] This application relates to the technical field of bicycles, and particularly to a training wheel assembly and a bicycle.

Background Art

[0003] In conventional children's bicycles, generally, training wheels are additionally installed near both the left and right sides of the rear wheel of the bicycle. The training wheels can prevent the bicycle from tipping over and avoid the child from falling during the ride.

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in conventional children's bicycles, the attachment and detachment between the vehicle body frame and the training wheels are inconvenient, and after removal, there is also a problem of how to properly store the training wheels.

Means for Solving the Problems

[0005] A training wheel assembly, including a mounting base and a holder, wherein the mounting base is used to be attached to the vehicle body frame 、 The holder has a first end and a second end. A training wheel is rotatably connected to the first end. A mounting hole is provided through either one of both the second end and the mounting base. The other of both the second end and the mounting base is configured to be engaged into the mounting hole from an opening of any one of the mounting holes.

[0006] In one embodiment, the mounting base or the second end is further provided with an elastic locking hook, which is configured to be elastically deformed by pressure from the wall of the mounting hole and enter the mounting hole together with the second end until the elastic locking hook passes through the mounting hole and engages with the edge of the opening of the mounting hole.

[0007] In one embodiment, the mounting base is provided with the mounting hole, and the second end is further provided with a stopper that is spaced apart from the elastic locking hook, and the second end and the elastic locking hook are engaged with the mounting base by the stopper, which abuts against the edges of the two opposing openings of the mounting hole, respectively.

[0008] In one embodiment, the elastic locking hook is formed by folding an elastic piece.

[0009] In one embodiment, the elastic locking hook is detachably connected to the second end.

[0010] In one embodiment, the elastic locking hook and the holder are integrally molded.

[0011] In one embodiment, the mounting base includes a base body through which the mounting hole is provided, and a flat shaft rotatably drilled in the wall of the mounting hole, and a position-restricting sliding groove is provided on the side of the second end adjacent to the mounting base, and the position-restricting sliding groove includes sequentially communicating position-restricting segments and lock segments, the width of the lock segment is greater than the width of the position-restricting segment, and the width of the position-restricting segment is equal to the minimum diameter of the flat shaft, When the second end enters the mounting hole, the flattened shaft can slide along the position limiting segment of the position limiting sliding groove with its minimum diameter and enter the locking segment. When the flattened shaft slides into the lock segment, the flattened shaft is configured to be rotatable relative to the lock segment by external force until the maximum diameter of the flattened shaft forms an angle with the position limiting segment and the flattened shaft engages with the groove wall of the lock segment.

[0012] In one embodiment, the mounting base further includes a torsion spring, one end of which is connected to the base body, and the other end of which is connected to the flattened shaft, and is configured such that when the flattened shaft slides out of the position limiting segment and enters the locking segment, the flattened shaft can be rotated back by the elastic force of the torsion spring such that the maximum diameter of the flattened shaft forms an angle with the position limiting segment.

[0013] In one embodiment, the position-limiting sliding groove further includes a guide segment communicating with the position-limiting segment, the width of the guide segment gradually decreases in the direction approaching the position-limiting segment, and the flattened shaft is configured to gradually rotate against the elastic force of the torsion spring by contact with the groove wall of the guide segment until the flattened shaft slides away from the guide segment and enters the position-limiting segment, once the minimum diameter of the flattened shaft is aligned with the position-limiting segment.

[0014] In one embodiment, the mounting base further includes a knob, the knob being connected to one end of the flat shaft that is exposed outside the base body, and the knob being configured to drive the rotation of the flat shaft by an external force.

[0015] A bicycle comprising a frame and an auxiliary wheel assembly as described in any of the above embodiments.

[0016] To more clearly explain the technical solutions in the embodiments of the present application or the prior art, the drawings required in the following description of the embodiments or the prior art will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can also obtain other drawings based on these drawings without creative effort.

Brief Description of the Drawings

[0017] [Figure 1] It is a perspective view of the configuration of an auxiliary wheel assembly according to an embodiment of the present application. [Figure 2] It is another schematic diagram of the configuration of an auxiliary wheel assembly in which the mounting base and the holder according to an embodiment of the present application are separated. [Figure 3] It is a partial cross-sectional view showing that the second end of the holder in the embodiment shown in FIG. 1 is engaged with the mounting base. [Figure 4] It is a schematic diagram showing that the holder in the embodiment shown in FIG. 1 enters from below the mounting hole. [Figure 5] It is a schematic diagram showing that the holder in the embodiment shown in FIG. 1 enters from above the mounting hole. [Figure 6] It is a perspective view of the configuration of an auxiliary wheel assembly according to another embodiment of the present application. [Figure 7] It is an exploded schematic diagram of the configuration of an auxiliary wheel assembly according to another embodiment of the present application. [Figure 8] It is a partial cross-sectional view showing that the second end of the holder in the embodiment shown in FIG. 7 is engaged with the mounting base. [Figure 9] It is a diagram showing the mounting process between the second end of the holder and the mounting base in the embodiment shown in FIG. 7. [Figure 10] It is a schematic diagram showing that the holder in the embodiment shown in FIG. 7 enters from below the mounting hole. [Figure 11] It is a schematic diagram showing that the holder in the embodiment shown in FIG. 7 enters from above the mounting hole.

Modes for Carrying Out the Invention

[0018] Hereinafter, referring to the drawings in the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present application, not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments in the present application without creative labor shall fall within the scope of protection of the present application.

[0019] Referring to Figures 1 to 8, the present application provides an auxiliary wheel assembly 10 including a mounting base 100 and a holder 200. The holder 200 has a first end 210 and a second end 220, to which an auxiliary wheel is rotatably connected; a mounting hole 101 is provided through either the second end 220 or the mounting base 100; and the other end is provided so as to enter and engage with the mounting hole 101 through one of its openings. For example, in the embodiment shown in Figures 1 to 4, the mounting base 100 has a mounting hole 101 through it, and the mounting base 100 may be for mounting to a bicycle frame (not shown), for example, the mounting base 100 may be mounted near the rear axle of a bicycle, and the mounting hole 101 may be positioned along the vertical direction, and the longitudinal direction of the mounting hole 101 can be considered to be substantially parallel to the vertical direction. As shown in Figures 4 and 5, the holder 200 has a first end 210 and a second end 220. The auxiliary wheel 300 is rotatably connected to the first end 210, and the second end 220 is provided so as to be able to enter the mounting hole 101 through one of the openings of the mounting hole 101 and engage with the mounting base 100. The through mounting hole 101 has two openings. As shown in Figures 1 and 4, when a user wants to add the auxiliary wheel 300 to the bicycle, the second end 220 of the holder 200 can be inserted through the lower opening of the mounting hole 101 to engage with the mounting base 100, without requiring any additional mounting tools as with conventional bicycle auxiliary wheel mounting. At this time, if the auxiliary wheel 300 on the first end 210 of the holder 200 is close to the ground, it will act as a support and prevent tipping over. As shown in Figures 2 and 5, if the user no longer wishes to use the auxiliary wheel 300, the holder 200 can be selectively removed from the mounting base 100, and the second end 220 of the holder 200 can be inserted from above the mounting hole 101 of the mounting base 100. In this case, the first end 210 of the holder 200 is facing upward, the auxiliary wheel 300 at the first end 210 is lifted off the ground, and the holder 200 can be considered to be mounted in reverse.In this way, the auxiliary effect of the training wheels 300 on the bicycle can be released, and the holder 200 can be stored away. The training wheels 300 and holder 200 can be held while riding, and the holder 200 can be immediately removed and reattached as needed. Furthermore, this installation reduces the packaging volume of the bicycle, making transportation and storage in warehouses easier. For example, at the time of shipment, the mounting base 100 can be attached to the frame of the bicycle, and the holder 200 with the training wheels 300 attached can be packaged separately.

[0020] Referring to Figures 1, 2, and 3, in the first embodiment, an elastic locking hook 230 is provided on the second end 220 of the holder 200, and the elastic locking hook 230 is provided so as to be able to elastically deform under pressure from the wall of the mounting hole 101 and enter the mounting hole 101 together with the second end 220 until the elastic locking hook 230 passes through the mounting hole 101 and engages with the edge of the opening of the mounting hole 101. When a user wants to connect the holder 200 to the mounting base 100, the second end 220 of the holder 200 and the elastic locking hook 230 thereon can be inserted through one opening of the mounting hole 101, and as the elastic locking hook 230 extends from the opening on the other side of the mounting hole 101, the elastic locking hook 230 engages with the edge of the opening of the mounting hole 101, thereby achieving mounting. When a user wants to remove the holder 200 from the mounting base 100, they can do so by appropriately pressing the elastic locking hook 230 by hand, causing the elastic locking hook 230 to detach from the edge of the opening of the mounting hole 101, and then removing the holder 200 from inside the mounting hole 101. As can be seen from this, the user does not need to use a separate mounting tool during the entire process of attaching and detaching the holder 200, making the operation more convenient.

[0021] In other embodiments, the mounting hole 101 may be provided at the second end 220 of the holder 200, and the elastic locking hook 230 may be attached to the mounting base 100. In other words, the present application does not limit the specific installation locations of the mounting hole 101 and the elastic locking hook 230, and intends for the mounting base 100 to be connectable to the second end 220 of the holder 200.

[0022] As shown in Figure 3, in some other embodiments, the elastic locking hook 230 is formed by folding an elastic piece. The elastic locking hook 230 formed by folding an elastic piece may be connected to the mounting base 100 in a fixed manner by adhesive or welding, or it may be connected in a removable manner by screw connection or locking. Furthermore, the removable connection between the elastic locking hook 230 and the mounting base 100 is advantageous for subsequent maintenance, for example, by removing and replacing the elastic piece individually when it deteriorates. In other embodiments, the elastic locking hook 230 and the holder 200 may be integrally molded. To understand this, the elastic locking hook 230 may be formed directly from the structure of the second end 220 of the holder 200, and it is sufficient that it has a certain amount of elastic deformation and that the elastic locking hook 230 deforms by contact with the wall of the mounting hole 101 and passes through the mounting hole 101.

[0023] Furthermore, as shown in Figures 1, 2, and 3, in some other embodiments, the second end 220 is further provided with a stopper 240 that is spaced apart from and opposite to the elastic locking hook 230, and the second end 220 and the elastic locking hook 230 are engaged with the mounting base 100 by the stopper 240, which abuts against the edges of the two opposing openings of the mounting hole 101, respectively.

[0024] Referring to Figures 6 to 11, in the second embodiment, the mounting base 100 includes a base body 110 through which a mounting hole 101 is provided, and a flat shaft 120 rotatably drilled in the hole wall of the mounting hole 101. As shown in Figures 7 and 9, a position-restricting sliding groove 250 is provided on the side of the second end 220 adjacent to the mounting base 100, and the position-restricting sliding groove 250 includes sequentially communicating position-restricting segments 252 and lock segments 253, the width of which the lock segments 253 is greater than the width of the position-restricting segments 252, and the width of the position-restricting segments 252 is equal to the minimum diameter of the flat shaft 120. When the second end 220 enters the mounting hole 101, the flat shaft 120 can slide along the position-restricting segments 252 of the position-restricting sliding groove 250 at its minimum diameter and enter the lock segments 253. As the flat shaft 120 slides into the lock segment 253, the flat shaft 120 is configured to rotate relative to the lock segment 253 by external force until the flat shaft 120 engages with the groove wall of the lock segment 253, with the maximum diameter of the flat shaft 120 forming an angle with the position limit segment 252. To understand this, the outer contour of the cross-section of the flat shaft 120 approximates an ellipse, with its maximum diameter considered as the major axis of the ellipse and its minimum diameter as the minor axis. During installation, the flat shaft 120 first passes through the position limit segment 252 of the position limit sliding groove 250 at its minimum diameter, i.e., at the point where the width of its cross-sectional contour is narrowest, and after the flat shaft 120 enters the lock segment 253, it is tightened as the flat shaft 120 rotates. It should be noted that the above is merely a schematic representation of the cross-sectional contour of the flattened shaft 120, and does not indicate or imply that the cross-sectional contour of the flattened shaft 120 must be in this manner.

[0025] Furthermore, as shown in Figures 7 and 8, in some other embodiments, the mounting base 100 further includes a torsion spring 130, one end of which is connected to the base body 110 and the other end of which is connected to a flat shaft 120, and the flat shaft 120 is configured such that when it slides from the position limiting segment 252 into the locking segment 253, the flat shaft 120 can return to its original position due to the elastic force of the torsion spring 130 so that the maximum diameter of the flat shaft 120 forms an angle with the position limiting segment 252. The installation of the torsion spring 130 allows the flat shaft 120 to automatically return to its original position after entering the locking segment 253 from the position limiting segment 252, i.e., the flat shaft 120 can rotate so that the maximum diameter of the flat shaft 120 forms an angle with the position limiting segment 252 without human intervention. Furthermore, when the maximum diameter of the flattened shaft 120 and the longitudinal direction of the position limiting segment 252 are perpendicular to each other, the flattened shaft 120 and the locking segment 253 of the position limiting sliding groove 250 have a good locking and fixing effect.

[0026] Furthermore, as shown in Figure 9, in some other embodiments, the position-limiting sliding groove 250 further includes a guide segment 251 communicating with a position-limiting segment 252, the width of which the guide segment 251 gradually decreases along the direction toward the position-limiting segment 252, and the flattened shaft 120 is configured to gradually rotate against the elastic force of the torsion spring 130 by contact with the groove wall of the guide segment 251 until the flattened shaft 120 slides away from the guide segment 251 and enters the position-limiting segment 252, once the minimum diameter of the flattened shaft 120 is aligned with the position-limiting segment 252. When the user inserts the second end 220 of the holder 200 into the mounting hole 101, the flat shaft 120 slides into the guide segment 251, which gradually decreases in width. That is, the guide segment 251 gradually shrinks along the direction approaching the position limiting segment 252, and the guide segment 251 can perform a constant guiding action. As a result, the flat shaft 120 rotates against the elastic force of the torsion spring 130 due to the action of the groove walls of the guide segment 251. Finally, the flat shaft 120 rotates to a position where its minimum diameter is parallel to the width direction of the position limiting segment 252. That is, the minimum diameter of the flat shaft 120 aligns with the position limiting segment 252, at which point the flat shaft 120 can automatically slide into the position limiting segment 252. In other words, the installation of the guide segment 251 eliminates the need to manually operate the flat shaft 120. The flat shaft 120 can rotate and adjust itself along the guide segment 251 until it is in a position where it can slide into the position limiting segment 252, which is advantageous for simplifying operation.

[0027] Furthermore, as shown in Figures 7 and 8, in some second embodiments, a stopper 240 is further provided at the second end 220, and the stopper 240 is located on the side away from the open end of the position-limiting sliding groove 250, that is, the stopper 240 is located on the side away from the guide segment 251 of the lock segment 253.

[0028] As shown in Figures 6, 7, and 8, in some other embodiments, the mounting base 100 further includes a knob 140 connected to one end of a flat shaft 120 that is exposed outside the base body 110, and the knob 140 is provided so as to be able to drive the rotation of the flat shaft 120 by external force. When a user attempts to remove the holder 200 from the mounting base 100, the knob 140 is operated to drive the flat shaft 120 against the elastic force of the torsion spring 130, adjusting the flat shaft 120 so that its minimum diameter aligns with the position limiting segment 252, thereby sliding the flat shaft 120 through the position limiting segment 252 and removing it. The connection between the knob 140 and the flat shaft 120 may be a fixed connection such as adhesive or welding, or it may be a removable connection. For example, in the embodiments shown in Figures 7 and 8, the connection between the knob 140 and the flat shaft 120 is a screw connection. Furthermore, the torsion spring 130 may have one end connected to the base body 110 and the other end directly connected to the knob 140. In other words, the connection between the torsion spring 130 and the flat shaft 120 can be considered as the torsion spring 130 being indirectly connected to the flat shaft 120 via the knob 140.

[0029] Furthermore, this application relates to a bicycle (not shown) that includes a body frame and an auxiliary wheel assembly 10 in any of the above embodiments.

[0030] The above-mentioned bicycle may have its auxiliary wheel assembly 10's mounting base 100 directly attached to the frame, for example, near the rear axle of the bicycle. Since the mounting hole 101 that penetrates the mounting base 100 has two openings, when a user wants to add auxiliary wheels 300 to the bicycle, the second end 220 of the holder 200 can be inserted through the lower opening of the mounting hole 101 to engage with the mounting base 100, without requiring a separate mounting tool as with conventional bicycle auxiliary wheel mounting. At this time, if the auxiliary wheel 300 at the first end 210 of the holder 200 is close to the ground, it will act as a support and prevent tipping over. If a user no longer wishes to use the training wheels 300, they can selectively remove the holder 200 from the mounting base 100 and then insert the second end 220 of the holder 200 from above the mounting hole 101 of the mounting base 100. In this case, the first end 210 of the holder 200 is facing upward, the training wheel 300 attached to the first end 210 is off the ground, and the holder 200 can be considered to have been inserted and attached in reverse. In this way, the auxiliary effect of the training wheels 300 on the bicycle can be released, and the holder 200 can be stored away. The training wheels 300 and holder 200 can be held while riding, and the holder 200 can be immediately removed and reattached as needed. Furthermore, this setup can reduce the packaging volume of the bicycle, making transportation and storage in a warehouse easier. For example, at the time of shipment, the mounting base 100 can be attached to the frame of the bicycle, and the holder 200 with the training wheels 300 attached can be packaged separately.

[0031] Each of the technical features of the above embodiments can be combined in any way, and for the sake of brevity, not all possible combinations of each of the technical features in the above embodiments have been described. However, as long as these combinations of technical features are inconsistent, they should be understood to fall within the scope described herein.

[0032] The above embodiments are merely examples of some embodiments of the present application, and although their description is specific and detailed, it should not be construed as limiting the scope of the claims. A person skilled in the art will be able to make several modifications and improvements without departing from the concept of the present application, all of which fall within the scope of protection. Therefore, the scope of patent protection of the present application should be based on the claims.

[0033] In the description of this application, directions or positional relationships indicated by terms such as "length," "width," "thickness," "center," "vertical direction," "horizontal direction," "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inside," "outside," "clockwise," "counterclockwise," "axial direction," "radial direction," and "circumferential direction" are based on the directions or positional relationships shown in the drawings and are merely for the purpose of simplifying the description of this application. They do not indicate or imply that the referred device or component has a specific direction or must be constructed and operated in a specific direction, and therefore cannot be understood as limitations on this application.

[0034] Furthermore, the terms "first" and "second" are merely descriptive and should not be understood as indicating or implying relative importance or implicitly representing the number of designated technical features. Therefore, the "first" and "second" features may explicitly or implicitly include at least one such feature. In this description, "plural" means at least two, for example, two, three, etc., unless otherwise specified.

[0035] In this application, unless otherwise specified, terms such as "attached," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, removable connections, integral connections, mechanical connections, electrical connections, direct connections, indirect connections via an intermediate medium, internal communication between two elements, or interaction relationships between two elements. Those skilled in the art will be able to understand the specific meaning of these terms in this application based on the specific circumstances.

[0036] In this application, unless otherwise specified, the presence of a first feature "above" or "below" a second feature may mean that the first and second features are in direct contact, or that they are indirectly in contact via an intermediate medium. Furthermore, the presence of a first feature "above," "above," and "upper side" of a second feature may simply mean that the first feature is directly above or diagonally above the second feature, or that the horizontal height of the first feature is greater than that of the second feature. The presence of a first feature "below," "below," and "below side" of a second feature may simply mean that the first feature is directly below or diagonally below the second feature, or that the horizontal height of the first feature is less than that of the second feature.

[0037] When one element is referred to as "provided," "fixed," or "installed" on another element, it may be directly connected to the other element or an intermediate element may be present. When one element is considered to be "connected" to another element, it may be directly connected to the other element or an intermediate element may be present simultaneously. The terms "vertical," "horizontal," "up," "down," "left," "right," and similar expressions used in this text are for illustrative purposes only and do not represent the only possible embodiments. [Explanation of symbols]

[0038] 10. Training Wheel Assembly 100 Mounting base 101 Mounting holes 110 Base Unit 120 Flat shaft 130 Torsion spring 140 Knobs 200 holder 210 1st end 220 2nd end 230 Elastic Locking Hooks 240 Stopper 250 Position-limiting sliding groove 251 Guide Segments 252 Location-Restricted Segments 253 Lock Segments 300 training wheels

Claims

1. A training wheel assembly, Including the mounting base and the holder, The aforementioned mounting base is used to be attached to the vehicle body frame. The holder has a first end and a second end, the first end to which an auxiliary wheel is rotatably connected, the mounting base is provided with a mounting hole through it, and the second end is configured to enter into the mounting hole through two opposing openings of the mounting hole and be able to engage with it. An elastic locking hook is provided at the second end, and the elastic locking hook is configured to be able to enter the mounting hole by elastic deformation due to pressure from the wall of the mounting hole until the elastic locking hook passes through the mounting hole and engages with the edge of the opening of the mounting hole. The auxiliary wheel assembly is characterized in that the second end is further provided with a stopper that is spaced apart from the elastic locking hook, and the second end and the elastic locking hook are engaged with the mounting base by the stopper, with the stopper contacting the edges of two opposing openings of the mounting hole, respectively.

2. The auxiliary wheel assembly according to claim 1, characterized in that the elastic locking hook is formed by folding an elastic piece.

3. The auxiliary wheel assembly according to claim 1, characterized in that the elastic locking hook and the holder are integrally molded.

4. The mounting base includes a base body through which the mounting hole is provided, and a flat shaft rotatably drilled in the wall of the mounting hole, and a position-restricting sliding groove is provided on the side of the second end adjacent to the mounting base, and the position-restricting sliding groove includes sequentially communicating position-restricting segments and lock segments, the width of the lock segment is greater than the width of the position-restricting segment, and the width of the position-restricting segment is equal to the minimum diameter of the flat shaft, When the second end enters the mounting hole, the flattened shaft can slide along the position limiting segment of the position limiting sliding groove with its minimum diameter and enter the locking segment. The auxiliary wheel assembly according to claim 1, characterized in that when the flattened shaft slides into the lock segment, the flattened shaft is configured to be rotatable relative to the lock segment by external force until the maximum diameter of the flattened shaft forms an angle with the position limiting segment and the flattened shaft engages with the groove wall of the lock segment.

5. A support wheel assembly, Including the mounting base and the holder, The aforementioned mounting base is used to be attached to the vehicle body frame. The holder has a first end and a second end, the first end to which an auxiliary wheel is rotatably connected, the mounting base is provided with a mounting hole through it, and the second end is configured to enter into the mounting hole through two opposing openings of the mounting hole and be able to engage with it. The mounting base includes a base body through which the mounting hole is provided, and a flat shaft rotatably drilled in the wall of the mounting hole, and a position-restricting sliding groove is provided on the side of the second end adjacent to the mounting base, and the position-restricting sliding groove includes sequentially communicating position-restricting segments and lock segments, the width of the lock segment is greater than the width of the position-restricting segment, and the width of the position-restricting segment is equal to the minimum diameter of the flat shaft, When the second end enters the mounting hole, the flattened shaft can slide along the position limiting segment of the position limiting sliding groove with its minimum diameter and enter the locking segment. An auxiliary wheel assembly characterized in that, when the flattened shaft slides into the lock segment, the flattened shaft is configured to be rotatable relative to the lock segment by external force until the maximum diameter of the flattened shaft forms an angle with the position limiting segment and the flattened shaft engages with the groove wall of the lock segment.

6. The auxiliary wheel assembly according to claim 4 or 5, wherein the mounting base further includes a torsion spring, one end of the torsion spring being connected to the base body, and the other end of the torsion spring being connected to the flat shaft, and the flat shaft being configured to return to its original position by the elastic force of the torsion spring when the flat shaft slides out of the position limiting segment and enters the locking segment, such that the flat shaft's maximum diameter forms an angle with the position limiting segment.

7. The auxiliary wheel assembly according to claim 6, wherein the position-limiting sliding groove further includes a guide segment communicating with the position-limiting segment, the width of the guide segment gradually decreases along the direction approaching the position-limiting segment, and the flattened shaft is configured to gradually rotate against the elastic force of the torsion spring by contact with the groove wall of the guide segment until the flattened shaft slides away from the guide segment and enters the position-limiting segment when the minimum diameter of the flattened shaft is aligned with the position-limiting segment.

8. The auxiliary wheel assembly according to claim 1, characterized in that the elastic locking hook is detachably connected to the second end.

9. The auxiliary wheel assembly according to claim 4 or 5, wherein the mounting base further includes a knob, the knob is connected to one end of the flat shaft that is exposed outside the base body, and the knob is configured to drive the rotation of the flat shaft by an external force.

10. The auxiliary wheel assembly according to claim 9, characterized in that the knob is fixedly connected to the flattened shaft.

11. The auxiliary wheel assembly according to claim 9, characterized in that the knob is detachably connected to the flat shaft.

12. The auxiliary wheel assembly according to claim 11, characterized in that the knob is screw-connected to the flat shaft.

13. A bicycle comprising a frame and an auxiliary wheel assembly according to any one of claims 1 to 5, 8.

14. The bicycle according to claim 13, characterized in that the mounting base is provided on the rear wheel axle of the vehicle frame.

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