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

Cross - reference to related applications

[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 riding.

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 has also been 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, The mounting base is used to be attached to the vehicle body frame, and mounting holes are provided through the mounting base. 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 the second end and the mounting base. The other of the second end and the mounting base is configured to be engaged by entering into the mounting hole from any opening of the mounting hole.

[0006] In one embodiment, an elastic locking hook is further provided on the mounting base or the second end. The elastic locking hook is configured to be elastically deformed by the pressing of the hole wall of the mounting hole until the elastic locking hook passes through the mounting hole and is engaged with the edge of the opening of the mounting hole, so that it can enter the mounting hole together with the second end.

[0007] In one embodiment, the mounting hole is provided on the mounting base, and a stopper is further provided on the second end opposite to the elastic locking hook with a space therebetween. The second end and the elastic locking hook are respectively abutted against the edges of two opposite openings of the mounting hole by the stopper and are engaged with the mounting base.

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

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

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

[0011] In one embodiment, the mounting base includes a base body provided with the mounting hole penetrating therethrough and a flat shaft rotatably bored in the hole wall of the mounting hole. A position-limiting sliding groove is provided on the side of the second end close to the mounting base. The position-limiting sliding groove includes a position-limiting segment and a locking segment communicating in sequence. The width of the locking segment is larger than the width of the position-limiting segment, and the width of the position-limiting segment is equal to the minimum diameter of the flat shaft. When the second end enters the mounting hole, the flat shaft can slide along the position-limiting segment of the position-limiting sliding groove with the minimum diameter and enter the locking segment. When the flat shaft slides into the lock segment, the flat shaft is configured to be rotatable relative to the lock segment by an external force until the maximum diameter of the flat shaft forms an angle with the position limiting segment and the flat shaft is engaged with the groove wall of the lock segment.

[0012] In one embodiment, the mounting base further includes a torsion spring. One end of the torsion spring is connected to the base body, and the other end of the torsion spring is connected to the flat shaft. When the flat shaft slides out of the position limiting segment and into the lock segment, the flat shaft is configured to be able to rotate back by the elastic force of the torsion spring such that the maximum diameter of the flat 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 along the direction approaching the position limiting segment. When the minimum diameter of the flat shaft is aligned with the position limiting segment, the flat shaft is configured to be gradually rotatable against the elastic force of the torsion spring by the abutment of the groove wall of the guide segment until the flat shaft slides out of the guide segment and into the position limiting segment.

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

[0015] A bicycle, comprising a vehicle body frame and an auxiliary wheel assembly according to any one 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 efforts.

Brief Description of the Drawings

[0017]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Modes for Carrying Out the Invention

[0018] Hereinafter, with reference 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 them. All other embodiments obtained by those skilled in the art based on the embodiments of the present application without creative labor shall fall within the scope of protection of the present application.

[0019] Referring to FIGS. 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. An auxiliary wheel is rotatably connected to the first end 210. A mounting hole 101 is provided through either one of both the second end 220 and the mounting base 100. The other one of both the second end 220 and the mounting base 100 is provided to be engageable by entering into the mounting hole 101 from any opening of the mounting hole 101. For example, in the embodiment shown in FIGS. 1 to 4, the mounting hole 101 is provided through the mounting base 100, and the mounting base 100 may be for attaching to a bicycle body frame (not shown). For example, the mounting base 100 can be attached near the rear wheel axle of the bicycle, and the mounting hole 101 can be arranged along the vertical direction, and it can be regarded that the longitudinal direction of the mounting hole 101 is substantially parallel to the vertical direction. As shown in FIGS. 4 and 5, the holder 200 has a first end 210 and a second end 220. An auxiliary wheel 300 is rotatably connected to the first end 210, and the second end 220 is provided to be engageable with the mounting base 100 by entering into the mounting hole 101 from any opening of the mounting hole 101. The penetrating mounting hole 101 has two openings. As shown in FIGS. 1 and 4, when a user attempts to additionally mount the auxiliary wheel 300 on the bicycle, if the second end 220 of the holder 200 is inserted from the lower opening of the mounting hole 101, it can be engaged with the mounting base 100 without the need for another mounting tool as in the case of mounting a conventional bicycle auxiliary wheel 300. At this time, if the auxiliary wheel 300 at the first end 210 of the holder 200 is close to the ground, it can perform a supporting function and prevent tipping over. As shown in FIGS. 2 and 5, when the user no longer wants to use the auxiliary wheel 300, the holder 200 can be selectively removed from the mounting base 100, and further, the second end 220 of the holder 200 can be inserted from above the mounting hole 101 of the mounting base 100. That is, at this time, the first end 210 of the holder 200 is upward, the auxiliary wheel 300 at the first end 210 is away from the ground, and it can be regarded that the holder 200 is reversely inserted and attached.In this way, it is possible to cancel the auxiliary effect of the auxiliary wheel 300 on the bicycle and to achieve the storage of the holder 200. During riding, the user can hold the auxiliary wheel 300 and the holder 200, and can immediately remove and reinstall the holder 200 as needed. By installing in this way, the packaging volume of the bicycle can be further reduced, facilitating transportation and storage in the warehouse. For example, at the time of shipment, the mounting base 100 can be attached to the vehicle frame, and the holder 200 with the auxiliary wheel 300 can be packaged separately.

[0020] Referring to FIGS. 1, 2, and 3, in the first embodiment, an elastic locking hook 230 is provided at the second end 220 of the holder 200. The elastic locking hook 230 is configured to be elastically deformed by the pressing of the hole wall of the mounting hole 101 until the elastic locking hook 230 passes through the mounting hole 101 and is engaged with the edge of the opening of the mounting hole 101, and can enter the mounting hole 101 together with the second end 220. When the user attempts 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 may be inserted from one opening of the mounting hole 101. When the elastic locking hook 230 extends from the opening on the other side of the mounting hole 101, the elastic locking hook 230 is engaged with the edge of the opening of the mounting hole 101, and the attachment can be realized. When the user attempts to separate the holder 200 from the mounting base 100, the elastic locking hook 230 can be appropriately pressed by hand to disengage the elastic locking hook 230 from the edge of the opening of the mounting hole 101, and the holder 200 can be removed from the mounting hole 101 to realize the removal of the holder 200. As can be seen from this, in the entire attachment and detachment process of the holder 200, the user does not need to use a separate attachment tool, and the operation becomes 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, in the present application, the specific installation positions of the mounting hole 101 and the elastic locking hook 230 are not limited, and it is intended that the mounting base 100 can be connected to the second end 220 of the holder 200.

[0022] As shown in FIG. 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 the elastic piece may be connected to the mounting base 100 in a manner of fixed connection by adhesion, welding, etc., or may be removably connected by screw connection, engagement, etc. Also, since the elastic locking hook 230 and the mounting base 100 are removably connected, it is advantageous for subsequent maintenance, for example, when the elastic piece deteriorates, to remove and replace it alone. In other embodiments, the elastic locking hook 230 and the holder 200 may be integrally formed. As can be understood, the elastic locking hook 230 may be directly formed from the structure of the second end 220 of the holder 200, have a certain amount of elastic deformation, and satisfy that the elastic locking hook 230 can be deformed by abutting against the hole wall of the mounting hole 101 and pass through the mounting hole 101.

[0023] Furthermore, as shown in FIGS. 1, 2, and 3, in some other embodiments, a stopper 240 is further provided at the second end 220 opposite to the elastic locking hook 230 with a space therebetween, and the second end 220 and the elastic locking hook 230 are respectively abutted against the edges of two opposite openings of the mounting hole 101 by the stopper 240 and fastened to the mounting base 100.

[0024] Referring to FIGS. 6 to 11, in the second embodiment, the mounting base 100 includes a base body 110 provided with a through mounting hole 101 and a flat shaft 120 rotatably drilled in the hole wall of the mounting hole 101. As shown in FIGS. 7 and 9, a position-limiting sliding groove 250 is provided on the side of the second end 220 close to the mounting base 100. The position-limiting sliding groove 250 includes a position-limiting segment 252 and a locking segment 253 that communicate in sequence. The width of the locking segment 253 is larger than the width of the position-limiting segment 252, and the width of the position-limiting segment 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-limiting segment 252 of the position-limiting sliding groove 250 with the minimum diameter and enter the locking segment 253. When the flat shaft 120 slides into the locking segment 253, the flat shaft 120 is configured to be rotatable relative to the locking segment 253 by an external force until the maximum diameter of the flat shaft 120 forms an angle with the position-limiting segment 252 and the flat shaft 120 is engaged with the groove wall of the locking segment 253. As can be understood, the outer contour of the cross-section of the flat shaft 120 approximates an elliptical shape, and its maximum diameter can be regarded as the major axis of the ellipse, and its minimum diameter can be regarded as the minor axis of the ellipse. During installation, the flat shaft 120 first passes through the position-limiting segment 252 of the position-limiting sliding groove 250 with the minimum diameter, that is, at the location where the width of the contour of its cross-section is the smallest. After the flat shaft 120 enters the locking segment 253, it is tightened when the flat shaft 120 rotates. It should be noted that the above is only a schematic description of the contour of the cross-section of the flat shaft 120, and does not indicate or imply that the contour of the cross-section of the flat shaft 120 must be like this.

[0025] Furthermore, as shown in FIGS. 7 and 8, in some other embodiments, the mounting base 100 further includes a torsion spring 130. One end of the torsion spring 130 is connected to the base body 110, and the other end of the torsion spring 130 is connected to the flat shaft 120. When the flat shaft 120 slides out of the position-limiting segment 252 and enters the locking segment 253, the flat shaft 120 is configured to be able to return and rotate under the action of the elastic force of the torsion spring 130 such that the maximum diameter of the flat shaft 120 forms an angle with the position-limiting segment 252. By installing the torsion spring 130, the flat shaft 120 can automatically return after entering from the position-limiting segment 252 into the locking segment 253, that is, the flat shaft 120 can rotate without human intervention such that the maximum diameter of the flat shaft 120 forms an angle with the position-limiting segment 252. Furthermore, when the longitudinal direction of the maximum diameter of the flat shaft 120 and the position-limiting segment 252 are perpendicular to each other, the flat shaft 120 and the locking segment 253 of the position-limiting sliding groove 250 have a good engagement and fixing effect.

[0026] Furthermore, as shown in FIG. 9, in some other embodiments, the position-limiting sliding groove 250 further includes a guide segment 251 communicating with the position-limiting segment 252. The width of the guide segment 251 gradually decreases along the direction approaching the position-limiting segment 252. When the minimum diameter of the flat shaft 120 is aligned with the position-limiting segment 252, the flat shaft 120 is configured to be gradually rotatable against the elastic force of the torsion spring 130 by the abutment of the groove wall of the guide segment 251 until the flat shaft 120 slides from the guide segment 251 into 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 with a gradually decreasing width, that is, the guide segment 251 gradually shrinks along the direction approaching the position-limiting segment 252. The guide segment 251 can perform a certain guiding function, whereby the flat shaft 120 rotates against the elastic force of the torsion spring 130 by the action of the groove wall of the guide segment 251. Finally, the flat shaft 120 rotates until the location of 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 is aligned with the position-limiting segment 252. At this time, the flat shaft 120 can automatically slide into the position-limiting segment 252. In other words, due to the installation of the guide segment 251, there is no need to manually operate the flat shaft 120. The flat shaft 120 can rotate and adjust itself along the guide segment 251 until it rotates to a position where the flat shaft 120 can slide into the position-limiting segment 252, which is advantageous for simplifying the operation.

[0027] Furthermore, as shown in FIGS. 7 and 8, in some second-type embodiments, a stopper 240 is further provided at the second end 220. 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 locking segment 253.

[0028] As shown in FIGS. 6, 7, and 8, in some other embodiments, the mounting base 100 further includes a knob 140. The knob 140 is connected to one end exposed outside the base body 110 of the flat shaft 120. The knob 140 is provided to be able to drive the rotation of the flat shaft 120 by the action of an external force. When the user attempts to remove the holder 200 from the mounting base 100, the knob 140 is operated to drive the flat shaft 120 to resist the elastic force of the torsion spring 130, and the flat shaft 120 is adjusted so that the minimum diameter thereof is aligned with the position limiting segment 252. Then, the flat shaft 120 is slid out through the position limiting segment 252 and removed. Also, the connection mode between the knob 140 and the flat shaft 120 may be a fixed connection mode such as adhesion or welding, or a removable connection. For example, in the embodiments shown in FIGS. 7 and 8, the connection mode between the knob 140 and the flat shaft 120 is a screw connection. It should be noted that one end of the torsion spring 130 may be connected to the base body 110 and the other end may be directly connected to the knob 140. That is, the connection between the torsion spring 130 and the flat shaft 120 can be regarded as the torsion spring 130 being indirectly connected to the flat shaft 120 through the knob 140.

[0029] In addition, the present application further relates to a bicycle (not shown) including a vehicle body frame and the auxiliary wheel assembly 10 in any of the above embodiments.

[0030] The above bicycle may have the mounting base 100 of the auxiliary wheel assembly 10 directly attached to the vehicle body frame. For example, it may be attached near the rear wheel axle of the bicycle. Since the mounting hole 101 passing through the mounting base 100 has two openings, when a user attempts to additionally attach the auxiliary wheel 300 to the bicycle, if the second end 220 of the holder 200 is inserted from the lower opening of the mounting hole 101, it can be engaged with the mounting base 100. Without the need for a separate mounting tool as in the case of mounting the auxiliary wheel 300 of a conventional bicycle, at this time, if the auxiliary wheel 300 at the first end 210 of the holder 200 is close to the ground, it can perform a supporting function and prevent tipping over. When the user no longer wishes to use the auxiliary wheel 300, the holder 200 can be selectively removed from the mounting base 100, and further, the second end 220 of the holder 200 can be inserted from above the mounting hole 101 of the mounting base 100. That is, at this time, the first end 210 of the holder 200 is upward, the auxiliary wheel 300 at the first end 210 is away from the ground, and it can be regarded as being reversely inserted and mounted. In this way, the auxiliary effect of the auxiliary wheel 300 on the bicycle can be released, and the storage of the holder 200 can also be realized. During riding, the auxiliary wheel 300 and the holder 200 can be carried by the side, and the holder 200 can be immediately removed and reinstalled as needed. In addition, by installing in this way, the packaging volume of the bicycle can be further reduced, facilitating transportation and storage in the warehouse. For example, at the time of shipment, the mounting base 100 can be attached to the vehicle body frame, and the holder 200 with the auxiliary wheel 300 can be packaged separately.

[0031] Each technical feature of the above embodiments can be arbitrarily combined. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be understood that it is within the scope described in this specification.

[0032] The above embodiments merely illustrate some embodiments of the present application. Although the description has been specific and detailed, it should not be construed as limiting the scope of the claims. Those skilled in the art can make some modifications and improvements without departing from the concept of the present application, and all of these belong to the protection scope of the present application. Therefore, the scope of patent protection of the present application should be based on the scope of the claims.

[0033] In the description of the present application, the orientation or positional relationship indicated by terms such as "length", "width", "thickness", "center", "longitudinal direction", "lateral direction", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial direction", "radial direction", "circumferential direction", etc. is based on the orientation or positional relationship shown in the drawings, and is merely for simplifying the description of the present application, and does not indicate or imply that the mentioned device or component must have a specific orientation and be structured and operated in a specific orientation, so it cannot be understood as a limitation to the present application.

[0034] Note that the terms "first" and "second" are merely for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the "first" and "second" features may include at least one of the corresponding features explicitly or implicitly. In the description of the present application, "a plurality" means at least two, for example, two, three, etc., unless otherwise specified.

[0035] In the present application, unless otherwise specified, terms such as "attach", "connect", "couple", "fix", etc. should be understood in a broad sense. For example, it may be a fixed connection, a removable connection, or an integral one, may be mechanically connected, electrically connected, directly connected, or indirectly connected through an intermediate medium, or may be the internal communication between two elements or the interaction relationship between two elements. Those skilled in the art can understand the specific meaning of the above terms in the present application based on the specific situation.

[0036] In this application, unless otherwise specified, for the first feature to be "above" or "below" the second feature, the first and second features may be in direct contact, or the first and second features may be in indirect contact through an intermediate medium. Also, for the first feature to be "above", "above and", or "upper side" of the second feature, it only indicates that the first feature is directly above or diagonally above the second feature, or the horizontal height of the first feature is higher than that of the second feature. For the first feature to be "below", "below and", or "lower side" of the second feature, it may only indicate that the first feature is directly below or diagonally below the second feature, or the horizontal height of the first feature is smaller than that of the second feature.

[0037] In addition, when one element is said to be "provided on", "fixed to", or "installed on" the other element, it may be directly on the other element or there may be an intermediate element. When one element is considered to be "connected to" the other element, it may be directly connected to the other element or an intermediate element may exist simultaneously. The terms "vertical", "horizontal", "above", "below", "left", "right", and similar expressions used in this text are for illustrative purposes and do not represent the only embodiment.

Description of Reference Numerals

[0038] 10 Auxiliary Wheel Assembly 100 Mounting Base 101 Mounting Hole 110 Base Body 120 Flat Shaft 130 Torsion Spring 140 Knob 200 Holder 210 First End 220 Second End 230 Elastic Locking Hook 240 Stopper 250 Position Limiting Sliding Groove 251 Guide Segment 252 Position Limiting Segment 253 Locking Segment 300 auxiliary wheels

Claims

1. An auxiliary wheel assembly, comprising: a mounting base and a holder, wherein the mounting base is used for being mounted on a vehicle body frame, the holder has a first end and a second end, an auxiliary wheel is rotatably connected to the first end, a mounting hole is provided through one of the second end and the mounting base, and the other of the second end and the mounting base is configured to enter into the mounting hole from an opening of the mounting hole and be engaged therewith. An auxiliary wheel assembly characterized by the above.

2. An elastic locking hook is provided on the mounting base or the second end. The elastic locking hook is configured to be elastically deformed by the pressing of the hole wall of the mounting hole and enter into the mounting hole until the elastic locking hook passes through the mounting hole and is engaged with the edge of the opening of the mounting hole. The auxiliary wheel assembly according to claim 1, characterized by the above.

3. The mounting hole is provided on the mounting base, and a stopper is further provided on the second end opposite to the elastic locking hook with a space therebetween. The second end and the elastic locking hook are respectively abutted against the edges of two opposite openings of the mounting hole by the stopper and are engaged with the mounting base. The auxiliary wheel assembly according to claim 2, characterized by the above.

4. The elastic locking hook is formed by folding an elastic piece. The auxiliary wheel assembly according to claim 2 or 3, characterized by the above.

5. The elastic locking hook and the holder are integrally formed. The auxiliary wheel assembly according to claim 2 or 3, characterized by the above.

6. The mounting base includes a base body provided with the mounting hole therethrough and a flat shaft rotatably bored in the hole wall of the mounting hole. A position-limiting sliding groove is provided on a side of the second end close to the mounting base. The position-limiting sliding groove includes a position-limiting segment and a locking segment communicating in sequence. The width of the locking segment is larger than the width of the position-limiting segment, and the width of the position-limiting segment is equal to the minimum diameter of the flat shaft. When the second end enters into the mounting hole, the flat shaft can slide along the position-limiting segment of the position-limiting sliding groove with the minimum diameter and enter into the locking segment. When the flat shaft slides into the lock segment, the flat shaft is configured to be rotatable relative to the lock segment by an external force until the maximum diameter of the flat shaft forms an angle with the position limiting segment and the flat shaft is engaged with the groove wall of the lock segment. The auxiliary wheel assembly according to claim 1, characterized in that.

7. The mounting base further includes a torsion spring. One end of the torsion spring is connected to the base body, and the other end of the torsion spring is connected to the flat shaft. When the flat shaft slides out of the position limiting segment and into the lock segment, the flat shaft is configured to be able to rotate back by the elastic force of the torsion spring such that the maximum diameter of the flat shaft forms an angle with the position limiting segment. The auxiliary wheel assembly according to claim 6, characterized in that.

8. 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. When the minimum diameter of the flat shaft is aligned with the position limiting segment, the flat shaft is configured to be gradually rotatable against the elastic force of the torsion spring by the abutment of the groove wall of the guide segment until the flat shaft slides out of the guide segment and into the position limiting segment. The auxiliary wheel assembly according to claim 7, characterized in that.

9. The elastic locking hook is removably connected to the second end. The auxiliary wheel assembly according to claim 2 or 3, characterized in that.

10. The mounting base further includes a knob. The knob is connected to one end of the flat shaft exposed outside the base body. The knob is configured to be able to drive the rotation of the flat shaft by an external force. The auxiliary wheel assembly according to any one of claims 6 to 8, characterized in that.

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

12. The knob is removably connected to the flat shaft. The auxiliary wheel assembly according to claim 10, characterized in that.

13. The knob is screwed to the flat shaft. The auxiliary wheel assembly according to claim 12, characterized in that.

14. A bicycle comprising a body frame and the auxiliary wheel assembly according to any one of claims 1 to 10.

15. The bicycle according to claim 14, wherein the mounting base is provided on a rear wheel axle of the body frame.

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