Bottom fork and frame connecting assembly and scooter

Abstract

The utility model relates to the technical field of scooters, in particular to a connecting assembly of a bottom fork and a scooter frame and the scooter, the bottom fork comprises a head tube, the connecting assembly of the bottom fork and the scooter frame comprises a bottom fork shaft, a needle bearing and a deep groove ball bearing, the bottom fork shaft penetrates through the head tube and the scooter frame, and the needle bearing penetrates through the deep groove ball bearing. The needle bearings are arranged at the two ends in the head tube and matched with the periphery of the bottom fork shaft, the deep groove ball bearings are arranged at at least one end in the head tube and matched with the periphery of the bottom fork shaft, and the deep groove ball bearings are located on the inner sides of the needle bearings. According to the connecting assembly of the bottom fork and the frame, the bottom fork can be restrained in the axial direction, the stability of the bearing is improved, and then the safety of a scooter is improved.

Description

Technical Field

[0001] This utility model relates to the field of mobility scooter technology, specifically to a connection component between a horizontal fork and a frame, and a mobility scooter. Background Technology

[0002] The swingarm is an important component of a mobility scooter, used to connect the rear wheel and the frame. In related technologies, the head tube of the swingarm is usually rotated with the frame via needle roller bearings and a shaft. The needle roller bearings can constrain the radial direction of the swingarm head tube, making the radial clearance controllable and reducing rotational resistance.

[0003] However, in related technologies, needle roller bearings cannot constrain the axial direction of the flat fork head tube, resulting in poor stability of the needle roller bearings and affecting the safety of the mobility scooter. Utility Model Content

[0004] This invention aims to at least partially solve one of the technical problems in related technologies. To this end, embodiments of this invention provide a connection assembly between the swingarm and the frame, which can constrain the axial direction of the swingarm, improve bearing stability, and thus enhance the safety of the scooter.

[0005] This utility model embodiment also proposes a mobility scooter.

[0006] The connection assembly between the swingarm and the frame according to this utility model embodiment includes a head tube and a connection assembly comprising: a swingarm shaft passing through the head tube and the frame; needle roller bearings located at both ends within the head tube and engaging with the outer periphery of the swingarm shaft; and a deep groove ball bearing located at at least one end within the head tube and engaging with the outer periphery of the swingarm shaft, the deep groove ball bearing being located inside the needle roller bearing.

[0007] The connection component between the flat fork and the frame in this embodiment of the invention can constrain the axial direction of the flat fork, improve the stability of the bearing, and thus improve the safety of the mobility scooter.

[0008] In some embodiments, the head tube includes a through hole through which the flat fork shaft passes, the through hole including a first section and a transition section connected in sequence, the first section being located at least at at least one end of the through hole, the cross-sectional area of ​​the first section being larger than the cross-sectional area of ​​the transition section to form a stepped surface between the first section and the transition section, the needle roller bearing and the deep groove ball bearing fitting within the first section, and the outer ring of the deep groove ball bearing abutting against the stepped surface and the outer ring of the needle roller bearing.

[0009] In some embodiments, the connection assembly between the swingarm and the frame further includes a retaining ring, wherein the inner circumferential surface of the first segment is provided with a groove, the retaining ring is fitted in the groove, and the retaining ring abuts against the outer ring of the deep groove ball bearing and the outer ring of the needle roller bearing.

[0010] In some embodiments, the through hole includes a first segment, a transition segment, and a second segment connected in sequence, the first segment being located at one end of the through hole and the second segment being located at the other end of the through hole, and the needle roller bearing fitting within the first segment and the second segment.

[0011] In some embodiments, the connection assembly between the swingarm and the frame further includes a bushing, which is clearance-fitted to the outer periphery of the swingarm axle. The bushing includes two first bushings and a second bushing disposed between the two first bushings. At least a portion of the first bushing is disposed between the swingarm axle and the needle roller bearing. One end of the first bushing away from the second bushing abuts against the frame. The inner ring of the deep groove ball bearing abuts against one end of the first bushing and the second bushing. The other end of the second bushing abuts against the other first bushing.

[0012] In some embodiments, the connection assembly between the flat fork and the frame further includes an oil seal, and at least one end face of the head tube is provided with an annular groove, the annular groove being arranged around and communicating with the through hole, the oil seal fitting within the annular groove, and the oil seal sealingly fitting around the outer periphery of the first bushing.

[0013] In some embodiments, the first bushing includes a first sleeve segment and a second sleeve segment connected in sequence. The end of the first sleeve segment away from the second sleeve segment abuts against the vehicle frame. The oil seal is sealed and fitted on the outer periphery of the first sleeve segment. The end of the second sleeve segment away from the first sleeve segment abuts against the second bushing. The needle roller bearing is fitted on the outer periphery of the second sleeve segment.

[0014] In some embodiments, the needle rollers of the needle roller bearing are rotatably fitted on the outer periphery of the first bushing, and the outer peripheral surface of the needle roller bearing is interference-fitted with the inner peripheral surface of the head tube.

[0015] In some embodiments, the connection assembly between the swingarm and the frame further includes at least one support member, which engages with the outer periphery of the second bushing and abuts against the outer peripheral surface of the second bushing and the inner peripheral surface of the head tube.

[0016] In some embodiments, the deep groove ball bearing is clearance-fitted to the outer circumference of the flat fork shaft, and the outer circumferential surface of the deep groove ball bearing is interference-fitted to the inner circumferential surface of the head tube.

[0017] In some embodiments, the connection assembly between the swingarm and the frame further includes a fastener, with one end of the swingarm shaft passing through the frame and the head tube and connected to the fastener.

[0018] The mobility scooter of this utility model includes the connection assembly between the flat fork and the frame described in the above embodiment.

[0019] The mobility scooter of this embodiment improves safety by including the connecting components of the flat fork and frame described in the above embodiment. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the connection assembly between the flat fork and the frame according to an embodiment of the present invention.

[0021] Figure 2 This is a cross-sectional view of the connection assembly between the flat fork and the frame according to an embodiment of the present invention.

[0022] Figure 3 This is a cross-sectional view of the head tube of the connection assembly between the flat fork and the frame according to an embodiment of the present invention.

[0023] Figure label:

[0024] Flat fork 10, head tube 101, through hole 102, first section 1021, groove 10211

[0025] Transition section 1022, second section 1023, stepped surface 1024, annular groove 103.

[0026] Frame size 20,

[0027] 1. Flat fork shaft; 2. Needle roller bearing; 3. Deep groove ball bearing; 4. Retaining ring.

[0028] Bushing 5, first bushing 51, first sleeve segment 511, second sleeve segment 512, second bushing 52.

[0029] Oil seal 6, support component 7, fastener 8. Detailed Implementation

[0030] The embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0031] The following is in conjunction with the appendix Figures 1-3 The connection components of the flat fork and frame according to embodiments of the present invention will be described in detail.

[0032] The connection assembly between the swingarm and the frame in this embodiment of the invention is used to connect the swingarm and the frame. The swingarm includes a head tube, and the connection assembly includes a swingarm axle, a needle roller bearing, and a deep groove ball bearing. The swingarm axle passes through the head tube and the frame. The needle roller bearings are located at both ends inside the head tube and fit around the outer periphery of the swingarm axle. The deep groove ball bearing is located at at least one end inside the head tube and fits around the outer periphery of the swingarm axle, and is located inside the needle roller bearing.

[0033] The connection assembly between the swingarm and the frame in this embodiment uses a swingarm shaft that passes through the head tube and the frame. Needle roller bearings that mate with the swingarm shaft are installed at both ends of the head tube, and a deep groove ball bearing that mates with the swingarm shaft is installed at at least one end of the head tube. The needle roller bearings restrict the radial degree of freedom of the head tube, and the deep groove ball bearings restrict the axial degree of freedom of the head tube, thus achieving axial and radial constraints on the swingarm. Furthermore, because needle roller bearings have a higher load-bearing capacity, placing them outside the deep groove ball bearings improves the stability of the bearings, thereby enhancing the safety of the scooter.

[0034] Specifically, such as Figure 1 and Figure 2 As shown, the head tube's axial direction is consistent with the left-right direction. The right end of the swingarm shaft passes through the head tube and the frame. There are two needle bearings, which are arranged at intervals in the left-right direction. One needle bearing is sleeved on the left end of the swingarm shaft and fitted inside the head tube, while the other needle bearing is sleeved on the right end of the swingarm shaft and fitted inside the head tube. The left needle bearing restricts the radial degree of freedom of the left end of the head tube, and the right needle bearing restricts the radial degree of freedom of the right end of the head tube, thus achieving radial limitation of the head tube.

[0035] The deep groove ball bearing is located at at least one end of the head tube. This can be understood as the deep groove ball bearing being located at the left end of the head tube, or at the right end of the head tube, or at both the left and right ends of the head tube. In this embodiment, the deep groove ball bearing is sleeved on the left end of the flat fork shaft and fitted inside the head tube. The deep groove ball bearing is located to the right of the needle roller bearing on the left side. The axial degree of freedom of the head tube is restricted by the deep groove ball bearing, thereby achieving axial positioning of the head tube.

[0036] Compared to placing the deep groove ball bearing on the outside of the needle roller bearing, this embodiment utilizes the greater load-bearing capacity of the needle roller bearing compared to the deep groove ball bearing. By placing the deep groove ball bearing on the inside of the needle roller bearing, that is, the needle roller bearing is closer to the end of the head tube than the deep groove ball bearing, the connecting assembly has a higher load-bearing capacity, thereby achieving the connection rigidity between the fork and the frame.

[0037] Furthermore, in this embodiment, by installing the needle roller bearing and the deep groove ball bearing in the same head tube, the high concentricity of the needle roller bearing and the deep groove ball bearing facilitates the improvement of the connection rigidity between the frame and the swingarm, thereby improving the swingarm's rotational flexibility.

[0038] In some embodiments, the head tube includes a through hole through which the flat fork shaft passes. The through hole includes a first section and a transition section connected in sequence. The first section is located at at least one end of the through hole. The cross-sectional area of ​​the first section is larger than the cross-sectional area of ​​the transition section to form a stepped surface between the first section and the transition section. A needle roller bearing and a deep groove ball bearing are fitted in the first section, and the outer ring of the deep groove ball bearing abuts against the stepped surface and the outer ring of the needle roller bearing.

[0039] Specifically, such as Figure 1 and Figure 3 As shown, the flat fork shaft passes through the through hole, and the needle roller bearing is fitted in the first section and located on the left side of the deep groove ball bearing. The deep groove ball bearing is fitted in the first section, and the left end of the outer ring of the deep groove ball bearing abuts against the outer ring of the needle roller bearing. The right end of the outer ring of the deep groove ball bearing abuts against the stepped surface. The needle roller bearing and the stepped surface limit the outer ring of the deep groove ball bearing, thereby achieving axial constraint between the outer ring of the deep groove ball bearing and the head tube.

[0040] In some embodiments, such as Figure 3 As shown, the connection assembly between the swingarm and the frame also includes a retaining ring. The inner circumferential surface of the first section has a groove, and the retaining ring fits into the groove, abutting against the outer rings of the deep groove ball bearing and the needle roller bearing. The left end of the outer ring of the deep groove ball bearing abuts against the right end of the retaining ring, and the right end of the outer ring abuts against the stepped surface. The left end of the retaining ring abuts against the outer ring of the needle roller bearing. The retaining ring serves two purposes: axially limiting the outer rings of both the needle roller and deep groove ball bearings, preventing axial movement between them, and achieving axial constraint between the deep groove ball bearing and the head tube.

[0041] In some embodiments, the through hole includes a first segment, a transition segment, and a second segment connected in sequence. The first segment is located at one end of the through hole, and the second segment is located at the other end of the through hole. The needle roller bearing is fitted inside the first segment and the second segment.

[0042] Specifically, such as Figure 3 As shown, the first section is located at the left end of the through hole, and the second section is located at the right end of the through hole. The needle roller bearing at the left end is fitted into the first section and is located on the left side of the deep groove ball bearing. The right end of the outer ring of the deep groove ball bearing abuts against the stepped surface formed between the first section and the transition section. The needle roller bearing at the right end is fitted into the second section, and the left end of the outer ring of the needle roller bearing at the right end abuts against the stepped surface formed between the second section and the transition section, which facilitates the limiting of the needle roller bearing at the right end.

[0043] In some embodiments, the connection assembly between the swingarm and the frame further includes a bushing with a clearance fit on the outer periphery of the swingarm shaft. The bushing includes two first bushings and a second bushing disposed between the two first bushings. At least a portion of the first bushing is disposed between the swingarm shaft and the needle roller bearing. One end of the first bushing away from the second bushing abuts against the frame. The inner ring of the deep groove ball bearing abuts against one end of the first bushing and the second bushing, and the other end of the second bushing abuts against the other first bushing.

[0044] Specifically, such as Figure 1 and Figure 2 As shown, two first bushings are arranged at intervals in the left-right direction. The left end of the first bushing on the left abuts against the frame, and the right end of the first bushing on the left abuts against the left end of the inner ring of the deep groove ball bearing. The right end of the inner ring of the deep groove ball bearing abuts against the left end of the second bushing, and the right end of the second bushing abuts against the left end of the first bushing on the right. The right end of the first bushing on the right abuts against the frame. By setting the first bushings and the second bushings, the axial movement of the inner ring of the deep groove ball bearing is limited, preventing axial movement of the inner ring of the deep groove ball bearing, and thus preventing axial movement of the head tube.

[0045] In some embodiments, such as Figure 1 and Figure 2 As shown, the connection assembly between the swingarm and the frame also includes an oil seal. At least one end face of the head tube has an annular groove surrounding and communicating with a through hole. The oil seal fits within the annular groove and seals against the outer circumference of the first bushing. By providing an oil seal at the end of the head tube, and ensuring that the oil seal fits and seals against the first bushing, external contaminants are prevented from entering the head tube. This allows the needle roller bearing and deep groove ball bearing to operate in a sealed environment, improving bearing life.

[0046] Optionally, the left and right end faces of the head tube are provided with annular grooves, and the left and right ends of the head tube are provided with oil seals to prevent external contaminants from entering the head tube from the left and right ends.

[0047] In some embodiments, the first bushing includes a first sleeve segment and a second sleeve segment connected in sequence. The end of the first sleeve segment away from the second sleeve segment abuts against the vehicle frame. An oil seal is fitted to the outer periphery of the first sleeve segment. The end of the second sleeve segment away from the first sleeve segment abuts against the second bushing. A needle roller bearing is fitted to the outer periphery of the second sleeve segment.

[0048] Specifically, such as Figure 1 and Figure 2As shown, the first sleeve is located outside the second sleeve. The left end of the first sleeve on the left abuts against the left end of the frame, the right end of the first sleeve on the left abuts against the left end of the second sleeve on the left, the right end of the second sleeve on the left abuts against the left end of the outer ring of the deep groove ball bearing, the right end of the outer ring of the deep groove ball bearing abuts against the left end of the second bushing, the right end of the second bushing abuts against the left end of the second sleeve on the right, the right end of the second sleeve on the right abuts against the left end of the first sleeve on the right, and the right end of the second sleeve on the right abuts against the right end of the frame. The needle roller bearing on the left is fitted onto the outer circumference of the second sleeve on the left, and the needle roller bearing on the right is fitted onto the outer circumference of the second sleeve on the right.

[0049] Optionally, the needle roller bearing is a needle roller bearing without an inner ring, and the second sleeve is matched with the needle roller bearing without an inner ring. The second sleeve is a standard part, which helps to reduce the cost of the first bushing.

[0050] In some embodiments, such as Figure 1 and Figure 2 As shown, the needle rollers of the needle roller bearing rotate around the outer circumference of the first bushing, and the outer circumferential surface of the needle roller bearing is interference-fitted with the inner circumferential surface of the head tube. Through the interference fit between the outer circumferential surface of the needle roller bearing and the inner circumferential surface of the head tube, the outer ring of the needle roller bearing rotates when the fork drives the head tube to rotate. The radial constraint on the head tube is achieved through the cooperation between the fork shaft, the first bushing, and the needle roller bearing.

[0051] In some embodiments, such as Figure 1 and Figure 2 As shown, the connection assembly between the swingarm and the frame also includes at least one support member. This support member engages with the outer periphery of the second bushing and abuts against the outer peripheral surface of the second bushing and the inner peripheral surface of the head tube. The inclusion of at least one support member ensures that the bushing is properly fitted within the head tube while maintaining concentricity between the bushing and the head tube, facilitating the connection between the swingarm axle and the frame, thereby improving the connection efficiency of the assembly.

[0052] Optionally, there are two supports, which are arranged at intervals in the left-right direction.

[0053] In some embodiments, such as Figure 1 and Figure 2 As shown, the deep groove ball bearing has a clearance fit on the outer circumference of the swingarm axle, while the outer circumferential surface of the deep groove ball bearing has an interference fit with the inner circumferential surface of the head tube. Through this interference fit, the outer ring of the deep groove ball bearing rotates when the head tube rotates, while the inner ring remains stationary. Because the inner ring of the deep groove ball bearing has a clearance fit with the swingarm axle, the swingarm axle is connected to the frame, preventing the head tube's movement from causing the frame's movement, thus improving the comfort of the scooter.

[0054] In this embodiment, the head tube and frame are connected by needle roller bearings and deep groove ball bearings, so that the swingarm can operate smoothly when the mobility scooter is subjected to high-speed impact or low-speed rotation, thereby improving the stability and safety of the mobility scooter.

[0055] In some embodiments, such as Figure 1 and Figure 2 As shown, the connection assembly between the swingarm and the frame also includes a fastener. One end of the swingarm axle passes through the frame and head tube and is connected to the fastener. The right end of the swingarm axle passes through the frame and head tube and is connected to the fastener, thus connecting the frame and head tube.

[0056] Optionally, the right end of the flat fork shaft is provided with an external thread, and the fastener is provided with an internal thread that mates with the external thread, so as to realize the threaded connection between the flat fork shaft and the fastener.

[0057] The mobility scooter of this utility model includes the connection assembly between the flat fork and the frame described in the above embodiment.

[0058] The mobility scooter of this embodiment improves safety by including the connection component between the flat fork and the frame as described in the above embodiment.

[0059] For example, personal mobility vehicles include motorcycles and electric vehicles.

[0060] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0061] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0062] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0063] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0064] In this utility model, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0065] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A connection assembly of a flat fork and a frame, characterized by The swingarm includes a head tube, and the connecting assembly includes: A swingarm axle, which passes through the head tube and the frame; Needle roller bearings, wherein the needle roller bearings are disposed at both ends inside the head tube and are fitted to the outer periphery of the flat fork shaft; A deep groove ball bearing, wherein at least one end of the deep groove ball bearing is disposed within the head tube and fits on the outer periphery of the flat fork shaft, and the deep groove ball bearing is located inside the needle roller bearing.

2. The connection assembly of a flat fork and a frame according to claim 1, characterized in that, The head tube includes a through hole through which the flat fork shaft passes. The through hole includes a first section and a transition section connected in sequence. The first section is located at least at one end of the through hole. The cross-sectional area of ​​the first section is larger than the cross-sectional area of ​​the transition section to form a stepped surface between the first section and the transition section. The needle roller bearing and the deep groove ball bearing are fitted in the first section, and the outer ring of the deep groove ball bearing abuts against the stepped surface and the outer ring of the needle roller bearing.

3. The connection assembly of a flat fork and a frame according to claim 2, characterized in that, It also includes a retaining ring, the inner circumferential surface of the first section is provided with a groove, the retaining ring is fitted in the groove, and the retaining ring abuts against the outer ring of the deep groove ball bearing and the outer ring of the needle roller bearing.

4. The connection assembly of claim 2, wherein, The through hole includes a first section, a transition section, and a second section connected in sequence. The first section is located at one end of the through hole, and the second section is located at the other end of the through hole. The needle roller bearing is fitted into the first section and the second section.

5. The connection assembly of a flat fork and a frame according to claim 4, characterized in that, It also includes bushings, which are clearance-fitted to the outer periphery of the swingarm shaft. The bushings include two first bushings and a second bushing disposed between the two first bushings. At least a portion of the first bushings is disposed between the swingarm shaft and the needle roller bearing. One end of the first bushing away from the second bushing abuts against the frame. The inner ring of the deep groove ball bearing abuts against one end of the first bushing and the second bushing. The other end of the second bushing abuts against the other first bushing.

6. The connection assembly of a flat fork and a frame according to claim 5, characterized in that, It also includes an oil seal, at least one end face of the head tube is provided with an annular groove, the annular groove is arranged around the through hole and communicates with the through hole, the oil seal is fitted in the annular groove, and the oil seal is sealed on the outer periphery of the first bushing.

7. The connection assembly of a flat fork and a frame according to claim 6, characterized in that, The first bushing includes a first sleeve segment and a second sleeve segment connected in sequence. The end of the first sleeve segment away from the second sleeve segment abuts against the vehicle frame. The oil seal is sealed and fitted on the outer periphery of the first sleeve segment. The end of the second sleeve segment away from the first sleeve segment abuts against the second bushing. The needle roller bearing is fitted on the outer periphery of the second sleeve segment.

8. The connection assembly between the flat fork and the frame according to claim 5, characterized in that, The needle rollers of the needle roller bearing are rotatably fitted on the outer circumference of the first bushing, and the outer circumferential surface of the needle roller bearing is interference-fitted with the inner circumferential surface of the head tube.

9. The connection assembly of claim 5, wherein, It also includes at least one support member, which is fitted on the outer periphery of the second bushing and abuts against the outer peripheral surface of the second bushing and the inner peripheral surface of the head tube.

10. The connection assembly of a flat fork to a frame according to any one of claims 1-9, characterized in that, The deep groove ball bearing is clearance-fitted to the outer circumference of the flat fork shaft, and the outer circumferential surface of the deep groove ball bearing is interference-fitted to the inner circumferential surface of the head tube.

11. The connection assembly of a flat fork to a frame according to any one of claims 1-9, characterized in that, It also includes a fastener, one end of which passes through the frame and the head tube and is connected to the fastener.

12. A scooter, characterized in that Includes the connection assembly between the flat fork and the frame according to any one of claims 1-11.

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