Quick mounting structure of bicycle crank

Abstract

The utility model provides a bicycle crank quick-assembly structure which comprises a connecting shaft arranged at one end of a crank, an assembling hole extending in the axial direction is formed in the connecting shaft, a positioning hole communicated with the assembling hole in the radial direction is formed in the side wall of the connecting shaft, a positioning pin is assembled in the positioning hole in a sliding mode, and a rotating sleeve capable of rotating is arranged outside the connecting shaft in a sleeved mode. The outer end of the positioning pin is in linkage fit with the inner wall of the rotating sleeve, the positioning pin can be driven to move inwards and outwards in the positioning space by rotating the rotating sleeve, and when one end of the middle shaft is inserted into the assembling hole, the positioning pin can be driven to move inwards by rotating the rotating sleeve so as to abut against and limit the outer wall of the middle shaft; during unlocking, the positioning pin can be driven to move outwards by reversely rotating the rotating sleeve. According to the quick assembling structure of the bicycle crank, a user can quickly assemble and disassemble the crank and the middle shaft without any work, and the experience feeling of the user is improved.

Description

Technical Field

[0001] This utility model relates to the field of bicycle technology, and more specifically, to a quick-release structure for a bicycle crank. Background Technology

[0002] Bicycles are a common mode of transportation, offering advantages such as energy efficiency, environmental friendliness, ease of use, and minimal parking space requirements. The pedals are the key component enabling the bicycle to move; they are connected to the bicycle's bottom bracket via cranks, and the connection between the pedals and cranks is threaded.

[0003] As a type of children's bicycle, the balance bike is controlled by the feet, which can effectively train children's balance and reaction ability, promote cerebellar development, and focus on developing leg strength and hand-eye coordination. A bicycle, on the other hand, is a vehicle that involves alternating leg pedaling and hand-held brakes, allowing for the development of both hemispheres of the brain and focusing on developing limb and overall coordination. Currently, a 2-in-1 bicycle combining a bicycle and a balance bike has been developed on the market. This allows users to transform it into a balance bike simply by disassembling the crank mechanism with pedals and the bottom bracket. However, in existing 2-in-1 bicycles, the connection between the crank and bottom bracket is still a traditional structure, requiring special tools for disassembly and assembly, which is inconvenient and results in a poor user experience. Summary of the Invention

[0004] The technical problem to be solved by this utility model is to overcome at least one of the defects of the above-mentioned related technologies and provide a quick-release structure for bicycle cranks that allows users to quickly install and remove the crank and bottom bracket without any assistance, thereby improving the user experience.

[0005] The technical solution of this utility model is to provide a quick-release structure for a bicycle crank, used to connect the crank and the bottom bracket, including...

[0006] A connecting shaft is connected to one end of the crank, and one end of the connecting shaft is provided with a fitting hole for inserting one end of the bottom shaft. A positioning hole is provided on the side wall of the connecting shaft that communicates radially with the fitting hole.

[0007] A positioning pin, which is slidably inserted into the positioning hole;

[0008] A rotating sleeve, which is rotatable around its own axis, is fitted outside the connecting shaft, and the outer end of the positioning pin is linked with the rotating sleeve. When one end of the central shaft is inserted into the mounting hole, rotating the rotating sleeve can drive the positioning pin to move inward to achieve tight sealing with the pedal central shaft, and to move outward to achieve disengagement and unlocking from the pedal central shaft.

[0009] In some embodiments, the positioning hole is a countersunk through hole, and the large-diameter end of the countersunk through hole is located at the outer end of the connecting shaft in the radial direction; the outer end of the positioning pin is provided with an annular limiting boss, and a first elastic element is provided between the bottom of the large-diameter end of the countersunk through hole and the limiting boss; an eccentric channel is provided on the inner peripheral wall of the rotating sleeve, and the outer end of the positioning pin abuts against the inner wall of the eccentric channel.

[0010] In some embodiments, a positioning retaining ring is connected to the end of the connecting shaft away from the crank, and the outer end of the fitting hole passes through the positioning retaining ring; a positioning component for limiting the rotation sleeve from reversing its locked position is provided between the positioning retaining ring and the rotating sleeve and / or between the rotating sleeve and the crank.

[0011] In some embodiments, the positioning component includes a positioning slot disposed at one end of the positioning retaining ring near the rotating sleeve, and a positioning insert plate disposed at one end of the rotating sleeve near the positioning retaining ring, which is inserted into the positioning groove.

[0012] In some embodiments, a second elastic element is provided between the end of the rotating sleeve away from the positioning retaining ring and the crank, so as to provide the rotating sleeve with both circumferential rotational restoring force and axial movement restoring force.

[0013] In some embodiments, the positioning retaining ring has an inwardly recessed arc-shaped guide groove at one end near the rotating sleeve, and the bottom of one end of the guide groove is connected to the other end of the positioning retaining ring to form the positioning slot; in the locked state, under the reset action of the second elastic member, the positioning insert plate is inserted and positioned in the positioning slot, and the rotating sleeve is pulled axially until the outer end face of the positioning insert plate is flush with the bottom surface of the guide groove, and then rotated circumferentially by a set angle to drive the positioning pin to move outward to achieve unlocking.

[0014] In some embodiments, an annular clearance groove is formed on the end face of the crank near the connecting shaft, and a receiving groove is provided inwardly at one end of the rotating sleeve near the crank, so that one end of the rotating sleeve forms an annular sleeve, and the annular sleeve is slidably fitted in the clearance groove along the axial direction; the second elastic element is located in the receiving groove.

[0015] In some embodiments, the second elastic element is a torsion spring, and the rotation direction of the rotating sleeve is consistent with the helix direction of the torsion spring. The bottom of the receiving groove is provided with a first positioning groove, one end of the torsion spring is inserted into the first positioning groove, and the first positioning groove is provided with a first positioning post for connecting the first connecting end of the torsion spring. The end face of the crank is provided with a second positioning groove, the other end of the torsion spring is inserted into the second positioning groove, and the second positioning groove is provided with a second positioning post for connecting the second connecting end of the torsion spring.

[0016] In some embodiments, the positioning component includes a positioning slot disposed at one end of the crank near the rotating sleeve, and a positioning insert plate disposed at one end of the rotating sleeve near the crank that is inserted into the positioning slot; and a second elastic element is disposed between the end of the rotating sleeve away from the crank and the positioning retaining ring for providing the rotating sleeve with both circumferential rotational restoring force and axial movement restoring force.

[0017] In some embodiments, a spring plunger is provided at the bottom of the mounting hole, and the positioning ball of the spring plunger is used to abut against the end face of the central shaft.

[0018] In summary, compared with related technologies, the quick-release structure for bicycle cranks of this utility model has the following advantages:

[0019] Firstly, in this invention, the rotating sleeve, positioning pin, and crank are integrated into a single structure. By rotating the rotating sleeve, the positioning pin can be driven to move in and out of the positioning space. When one end of the central axle is inserted into the mounting hole, rotating the rotating sleeve can drive the positioning pin to move inward and achieve tight sealing against the outer wall of the pedal central axle. When unlocking, rotating the rotating sleeve in the opposite direction can drive the positioning pin to move outward. No other tools are needed, and the user can operate it by himself. Furthermore, disassembling the crank assembly of the bicycle can make the balance bike structure simpler.

[0020] Secondly, by adding a positioning component structure, the rotating sleeve is prevented from rotating in the opposite direction, ensuring the stability of the locking structure; and when rotating to unlock, the guide groove is used for positioning to ensure that the rotating sleeve rotates smoothly, thereby enabling the eccentric channel to move more accurately in the direction of positioning.

[0021] Furthermore, by setting a torsion spring structure, the rotating sleeve can automatically reset itself after rotating to unlock the positioning pin. The torsion spring also provides axial reset force, so that the rotating sleeve first reverses to reset and then moves axially to reset, driving the positioning plate to be inserted and positioned into the corresponding positioning slot again.

[0022] Other improvements and advantages of this invention will be set forth in the detailed description that follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objectives and other advantages of this invention can be realized and obtained through the structures particularly pointed out in the description and drawings. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the bicycle crank quick-release structure according to Embodiment 1 of this utility model;

[0024] Figure 2 for Figure 1 A disassembled structural diagram of the quick-release mechanism of the crankshaft in a Chinese bicycle.

[0025] Figure 3 for Figure 1 A partial vertical sectional view of the quick-release mechanism of a bicycle crank;

[0026] Figure 4 for Figure 1 A cross-sectional view of the quick-release mechanism of a bicycle crank;

[0027] Figure 5 This is a partial structural diagram of the bicycle crank quick-release structure of this utility model in the unlocked state;

[0028] Figure 6 This is a partial structural view of the bicycle crank quick-release structure of this utility model in the unlocked state from another angle;

[0029] Figure 7 This is a schematic diagram of the positioning retaining ring structure in this utility model;

[0030] Figure 8 This is a schematic diagram of the rotating sleeve in this utility model;

[0031] Figure 9 This is a schematic diagram of the crank mechanism in this utility model;

[0032] Figure 10 This is an exploded structural diagram of the crank quick-release structure of Embodiment 3 of this utility model.

[0033] Explanation of reference numerals in the attached figures:

[0034] 1. Crank; 2. Connecting shaft; 3. Mounting hole; 4. Positioning hole; 5. Positioning pin; 6. Rotating sleeve; 7. Limiting boss; 8. First elastic element; 9. Eccentric channel; 10. Positioning retaining ring; 11. Positioning slot; 12. Positioning insert plate; 13. Second elastic element; 14. Guide groove; 15. Receiving groove; 16. Annular sleeve; 17. Annular boss; 18. First positioning groove; 19. First positioning pin; 20. Second positioning groove; 21. Second positioning pin; 22. Spring plunger; 23. Clearance groove; 24. Positioning boss; 25. First hanging mechanism; 26. Positioning slot; 27. Second hook. Detailed Implementation

[0035] First, those skilled in the art should understand that these embodiments are merely used to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention. Those skilled in the art can make adjustments as needed to adapt to specific application scenarios.

[0036] In the description of the embodiments of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the term "connection" should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral connection; it can refer to a mechanical connection or an electrical connection. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this utility model based on the specific circumstances.

[0037] In this embodiment of the utility model, unless otherwise explicitly specified and limited, the first feature at the "upper end" or "lower end" of the second feature may be in direct contact with the first feature, or indirect contact with the first feature through an intermediate medium. Moreover, the first feature at the "lower end" or "lower side" of the second feature may be directly below or diagonally below the second feature, or simply indicate that the horizontal height of the first feature is less than that of the second feature.

[0038] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0039] Example 1:

[0040] See Figures 1-9 As shown in the figure, this utility model embodiment discloses a quick-connect structure for a bicycle crank, which is used to realize the quick insertion of the crank 1 and the bottom bracket. The structure includes a connecting shaft 2, one end of which is connected to one end of the crank 1. Preferably, the connecting shaft 2 and the crank 1 are integrally formed to ensure structural strength and simplify the production process.

[0041] The other end of the connecting shaft 2 is formed with an axially extending fitting hole 3, which is used for inserting one end of the central shaft. In the prior art, the end of the central shaft is basically a standard square structure, so the fitting hole 3 in this structure is also a square hole. In addition, a positioning hole 4 is provided on the side wall of the connecting shaft 2, which is radially connected to the fitting hole 3. A positioning pin 5 is installed in the positioning hole 4 and can slide and extend along its depth direction. A rotating sleeve 6 is fitted on the outside of the connecting shaft 2, and the rotating sleeve 6 can rotate around its own axis. The outer end of the positioning pin 5 is linked with the rotating sleeve 6. That is, by rotating the rotating sleeve 6, the positioning pin 5 can be driven to move in and out of the positioning hole. When one end of the central shaft is inserted into the fitting hole 3, rotating the rotating sleeve 6 can drive the positioning pin 5 to move inward to achieve tight sealing and limitation with the outer wall of the pedal central shaft. When unlocking, rotating the rotating sleeve 6 in the opposite direction can drive the positioning pin 5 to move outward.

[0042] In the above structure, preferably, there are two symmetrically arranged positioning pins 5, which are positioned and restrained on the side wall of the central shaft end to ensure stable and reliable locking force.

[0043] Of course, in some other embodiments, if the size allows, four locating pins 5 may be provided corresponding to the four sides of the outer wall of the central shaft. In extreme cases, only one locating pin 5 may be provided, abutting against any one side wall on the outer wall of one end of the central shaft.

[0044] For more details in this embodiment, please refer to the appendix. Figure 6 Both positioning holes 4 are countersunk through holes, with the large-diameter end of the countersunk through hole located radially outward from the connecting shaft 2. The outer end of the positioning pin 5 is provided with an annular limiting boss 7. A first elastic element 8 is provided between the bottom of the large-diameter end of the countersunk through hole and the limiting boss 7. In this structure, the limiting boss 7 prevents the positioning pin 5 from falling into the fitting hole 3, and the first elastic element 8 drives the positioning pin 5 to always have an outward tendency. When the rotating sleeve 6 is rotated to unlock, the positioning pin 5 can quickly return to its original position. Preferably, the first elastic element 8 is a small cylindrical spring, and the small spring is fitted outside the positioning pin 5. One end of the small spring abuts against the end face of the limiting boss 7, and the other end abuts against the bottom of the large-diameter end of the countersunk hole.

[0045] As a preferred structural form, participate in the appendix Figure 2 In the above structure, an eccentric channel 9 is provided on the inner circumferential wall of the rotating sleeve 6. The outer end of the positioning pin 5 abuts against the inner wall of the eccentric channel 9. When the rotating sleeve 6 rotates circumferentially, the positioning pin 5 can move within the positioning hole 4 under the action of the eccentric channel 9 on its inner wall. In this embodiment, there are two positioning pins 5. Correspondingly, two eccentric channels 9 symmetrically arranged along the central axis are provided on the inner wall of the rotating sleeve 6. When the rotating sleeve 6 rotates circumferentially, the two positioning pins 5 move inward or outward synchronously under the drive of the two eccentric channels 9. More specifically, in order to ensure a more accurate fit between the outer end of the positioning pin 5 and the inner wall of the eccentric channel 9, the outer ends of both positioning pins 5 are set as arc surfaces.

[0046] In this embodiment, a positioning retaining ring 10 is connected to the end of the connecting shaft 2 away from the crank 1. The positioning retaining ring 10 is connected to the outer end face of the connecting shaft 2 via a connecting bolt. Furthermore, the outer end of the fitting hole 3 passes through the positioning retaining ring 10, meaning that a through hole corresponding to the fitting hole 3 is provided in the middle of the positioning retaining ring 10. A positioning component for limiting the reverse rotation of the rotating sleeve 6 is provided between the positioning retaining ring 10 and the rotating sleeve 6. Specifically, as a preferred structure, see the attached diagram. Figure 2 , 3 In conjunction with 6 and 7, the positioning assembly includes a positioning slot 11 located at one end of the positioning retaining ring 10 near the rotating sleeve 6. The rotating sleeve 6 is provided with a positioning insert plate 12 at one end near the positioning retaining ring 10. In use, rotating the rotating sleeve 6 drives the positioning pin 5 to abut against the side wall of the central shaft for a limited position. Then, axially pushing the rotating sleeve 6 drives the positioning insert plate 12 to be inserted into the positioning slot 11 to limit the reverse rotation of the rotating sleeve 6 and ensure the stability of the locking structure of the positioning pin 5.

[0047] More specifically, in the above structure, a second elastic element 13 is provided between the end of the rotating sleeve 6 away from the positioning retaining ring 10 and the crank 1, which provides both circumferential rotational reset force and axial movement reset force for the rotating sleeve 6. That is, when rotating the rotating sleeve 6 drives the positioning pin 5 to move outward to unlock, the external force is released, and under the reset force of the second elastic element 13, the rotating sleeve 6 can rotate in the opposite direction to reset, and it can also provide a reset force in the axial direction, driving the positioning insert plate 12 to be inserted and reset into the positioning slot 11.

[0048] In this embodiment, to further ensure the stability of the rotating sleeve 6 during rotation, an arc-shaped guide groove 14 is provided recessed at one end of the positioning retaining ring 10 near the rotating sleeve 6, and the center of the guide groove 14 coincides with the center of the rotating sleeve 6. The bottom of the guide groove 14 at the end opposite to the rotation direction of the rotating sleeve 6 is connected to the other end of the positioning retaining ring 10 to form a positioning slot 11, that is, it is a connecting groove. In the locked state, under the circumferential and axial reset action of the second elastic member 13, the insert plate is inserted and positioned in the positioning slot 11, and after the insertion is limited, the rotating sleeve 6 cannot rotate in the opposite direction, ensuring the stability of the locking structure. When unlocking is required, the rotating sleeve 6 is first pulled axially until the outer end face of the positioning insert plate 12 is flush with the bottom surface of the guide groove 14. Then, the rotating sleeve 6 is rotated in the set direction. Under the action of the eccentric channel 9 and the first elastic member 8, the positioning pin 5 moves outward in the opposite direction until its inner end separates from the outer wall of the central shaft, releasing the abutting and limiting force. At this time, the crank 1 can be pulled out from the end of the central shaft.

[0049] On the other hand, see Appendix Figure 2 , 3 In this embodiment, the rotating sleeve 6 has a recessed receiving groove 15 near the crank 1, so that one end of the rotating sleeve 6 forms an annular sleeve 16. The crank 1 has an annular boss 17 near the rotating sleeve 6, and the outer end of the annular boss 17 is slidably fitted within the annular sleeve 16. The second elastic element 13 is located within the receiving groove 15. In this structure, the annular sleeve 16 and the annular boss 17 are slidably fitted so that the receiving groove 15 partially forms a closed chamber, which serves as a dustproof function and improves the service life of the second elastic element 13. (See attached diagram for details.) Figure 3 and 4 The annular boss 17 is integrally formed on the end face of the crank 1, and the outer wall of the annular boss 17 coincides with the outer wall of the connecting shaft 2. In this embodiment, a small arc-shaped clearance groove 23 is provided at the connection position between the annular boss 17 and the crank 1, which can increase the length of the cylindrical outer wall of the connecting column, thereby increasing the overlapping area of ​​the annular sleeve 16 and the annular boss 17 without increasing the thickness of the crank 1, effectively ensuring the space for axial stretching of the rotating sleeve 6, while ensuring the dustproof effect.

[0050] In the above structure, when unlocking or opening, the rotating sleeve 6 must first be pulled axially towards the crank 1 by a certain distance before it can rotate. To avoid excessive travel and malfunction, please refer to the appendix. Figure 3 In this embodiment, a corresponding positioning boss 24 is provided on the inner peripheral wall of the receiving groove 15. When the rotating sleeve 6 moves to one end of the crank 1 until the boss abuts against the end face of the annular boss 17 within a certain range, it cannot continue to move, thus playing a role in limiting the stroke.

[0051] In this embodiment, preferably, see Appendix Figure 8 and 9 The second elastic element 13 is a cylindrical torsion spring, which has the circumferential elastic reset function of a torsion spring and the axial elastic reset function after axial compression. The rotation direction of the rotating sleeve 6 is consistent with the helical direction of the torsion spring. The bottom of the receiving groove 15 is provided with a first positioning groove 18. One end of the torsion spring is inserted into the first positioning groove 18, and the first positioning groove 18 is provided with a first positioning post 19 for connecting the first connecting end of the torsion spring. The outer end face of the annular boss 17 is recessed with a second positioning groove 20. The other end of the torsion spring is inserted into the second positioning groove 20, and the second positioning groove 20 is provided with a second positioning post 21 for connecting the second connecting end of the torsion spring.

[0052] For others, see Appendix Figure 3 The bottom of the mounting hole 3 is provided with a spring plunger 22, and the positioning ball of the spring plunger 22 is used to abut against the end face of the bottom shaft. After the crank 1 and the bottom shaft are installed, the spring plunger 22 is in a compressed state. When disassembling later, the elastic restoring force of the spring plunger 22 can facilitate the separation of the crank 1 from the bottom shaft.

[0053] In other embodiments, guide ramps can be provided on the side of the two locating pins 5 near the opening of the fitting hole 3 to facilitate the smooth insertion and fitting of one end of the central shaft into the fitting hole 3. Additionally, anti-slip treatment can be applied to the outer peripheral wall of the rotating sleeve 6, such as adding anti-slip textures or arc-shaped grooves that match the fingers. Furthermore, rotation direction markings can be added to improve operational convenience.

[0054] Example 2:

[0055] The structure of this embodiment is basically the same as that of Embodiment 1, the only difference being the position of the positioning component and the connection method of the elastic element. Specifically, the positioning component includes a recessed annular guide groove 14 located at one end of the crank 1 near the rotating sleeve 6. The bottom of one end of the guide groove 14 continues to be recessed to form a positioning slot 11. The rotating sleeve 6 near the crank 1 has a positioning insert plate 12 that is inserted into the positioning slot 11. Furthermore, a second elastic element 13 is provided between the rotating sleeve 6 away from the crank 1 and the positioning retaining ring 10 to simultaneously provide the rotating sleeve 6 with circumferential rotational reset force and axial movement reset force. The second elastic element 13 in this structure is the same as in Embodiment 1, which is a cylindrical torsion spring.

[0056] Regarding the connection method of the second elastic element, in this embodiment, a receiving groove 15 for accommodating the second elastic element 13 is provided at the end of the rotating sleeve 6 away from the crank 1. A positioning insertion hole (not shown in the figure) axially connects to the other end face of the receiving groove 15. One end of the torsion spring is provided with a first hook that engages with the first insertion hole. The outer peripheral wall of the positioning retaining ring 10 near the rotating sleeve 6 is provided with a positioning groove extending axially. The other end of the torsion spring is provided with a second hook that engages with the positioning groove. During installation, the end with the first hook is first passed through the positioning insertion hole, then rotated at a certain angle so that the hook of the first hook engages with the side wall of the positioning insertion hole. Then, the positioning retaining ring 10 is installed, so that the second hook at the other end of the torsion spring radially engages with the positioning groove, achieving the connection and positioning of the two ends of the torsion spring.

[0057] Similarly, to achieve dust prevention for the torsion spring, an annular sleeve 16 can be provided radially outward at the end of the rotating sleeve 6 near the positioning retaining ring 10. The annular sleeve 16 is slidably fitted onto the outside of the positioning retaining ring 10. Furthermore, unlike Embodiment 1, in this structure, during unlocking, the rotating sleeve 6 must first be moved away from the crank 1 until the positioning insert 12 disengages from the positioning slot 11 before rotation. Since the positioning structure and principle of the positioning component are similar to those in Embodiment 1, specific structural details are not illustrated in this embodiment.

[0058] In the description of the embodiments of this utility model, it should be noted that the terms "inner", "outer", "bottom", etc., indicating the direction or positional relationship are based on the direction or positional relationship shown in the drawings. This is only for the convenience of description and does not indicate or imply that the device or component must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this utility model.

[0059] In the description of this utility model, the reference to terms such as "this embodiment," "some embodiments," etc., indicates that a specific feature, structure, material, or characteristic described in connection with that embodiment or example 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 a suitable manner in any 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.

[0060] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A quick-release structure for a bicycle crank, used to connect the crank (1) and the bottom bracket, characterized in that: include A connecting shaft (2) is connected to one end of the crank (1), and one end of the connecting shaft (2) is provided with a fitting hole (3) for inserting and fitting one end of the central shaft. A positioning hole (4) is provided on the side wall of the connecting shaft (2) and communicates radially to the fitting hole (3). Positioning pin (5), which slides through the positioning hole (4); The rotating sleeve (6) is mounted on the outside of the connecting shaft (2) and can rotate around its own axis. The outer end of the positioning pin (5) is linked with the rotating sleeve (6). When one end of the central shaft is inserted into the mounting hole (3), rotating the rotating sleeve (6) can drive the positioning pin (5) to move inward to achieve tight sealing with the central shaft of the pedal, and to move outward to achieve disengagement and unlocking from the central shaft of the pedal.

2. The bicycle crank quick-release structure according to claim 1, characterized in that: The positioning hole (4) is a countersunk through hole, and the large diameter end of the countersunk through hole is located at the outer radial end of the connecting shaft (2); the outer end of the positioning pin (5) is provided with an annular limiting boss (7), and a first elastic element (8) is provided between the bottom of the large diameter end of the countersunk through hole and the limiting boss (7); the inner peripheral wall of the rotating sleeve (6) is provided with an eccentric channel (9), and the outer end of the positioning pin (5) abuts against the inner wall of the eccentric channel (9).

3. The bicycle crank quick-release structure according to claim 1, characterized in that: The connecting shaft (2) is connected to a positioning retaining ring (10) at the end away from the crank (1), and the outer end of the fitting hole (3) passes through the positioning retaining ring (10); a positioning component is provided between the positioning retaining ring (10) and the rotating sleeve (6) and / or between the rotating sleeve (6) and the crank (1) to limit the rotation of the rotating sleeve (6) from reversing the locking position.

4. The bicycle crank quick-release structure according to claim 3, characterized in that: The positioning component includes a positioning slot (11) located at one end of the positioning retaining ring (10) near the rotating sleeve (6), and a positioning insert plate (12) that is inserted into the positioning groove at one end of the rotating sleeve (6) near the positioning retaining ring (10).

5. The bicycle crank quick-release structure according to claim 4, characterized in that: A second elastic element (13) is provided between the end of the rotating sleeve (6) away from the positioning retaining ring (10) and the crank (1) to provide the rotating sleeve (6) with both circumferential rotational reset force and axial movement reset force.

6. The bicycle crank quick-release structure according to claim 5, characterized in that: The positioning retaining ring (10) has an inwardly recessed arc-shaped guide groove (14) at one end near the rotating sleeve (6). The bottom of one end of the guide groove (14) is connected to the other end of the positioning retaining ring (10) to form the positioning slot (11). In the locked state, under the reset action of the second elastic member (13), the positioning insert (12) is inserted and positioned in the positioning slot (11). The rotating sleeve (6) is pulled axially until the outer end face of the positioning insert (12) is flush with the bottom surface of the guide groove (14). After rotating it circumferentially by a set angle, the positioning pin (5) can be driven to move outward to unlock.

7. The bicycle crank quick-release structure according to claim 6, characterized in that: The rotating sleeve (6) has a recessed receiving groove (15) at one end near the crank (1) so that one end of the rotating sleeve (6) forms an annular sleeve (16). The crank (1) has an annular boss (17) at one end near the rotating sleeve (6), and the outer end of the annular boss (17) slides in the annular sleeve (16). The second elastic element (13) is located in the receiving groove (15).

8. The bicycle crank quick-release structure according to claim 7, characterized in that: The second elastic element (13) is a torsion spring, and the rotation direction of the rotating sleeve (6) is consistent with the helix direction of the torsion spring. The bottom of the receiving groove (15) is provided with a first positioning groove (18). One end of the torsion spring is inserted into the first positioning groove (18), and the first positioning groove (18) is provided with a first positioning post (19) for connecting the first connecting end of the torsion spring. The outer end face of the annular boss (17) is provided with a second positioning groove (20). The other end of the torsion spring is inserted into the second positioning groove (20), and the second positioning groove (20) is provided with a second positioning post (21) for connecting the second connecting end of the torsion spring.

9. The bicycle crank quick-release structure according to claim 3, characterized in that: The positioning assembly includes a positioning slot (11) located at one end of the crank (1) near the rotating sleeve (6), and a positioning insert plate (12) that is inserted into the positioning slot (11) at one end of the rotating sleeve (6) near the crank (1); and a second elastic element (13) is provided between the end of the rotating sleeve (6) away from the crank (1) and the positioning retaining ring (10) to provide the rotating sleeve (6) with both circumferential rotational reset force and axial movement reset force.

10. The bicycle crank quick-release structure according to any one of claims 1 to 9, characterized in that: The bottom of the mounting hole (3) is provided with a spring plunger (22), and the positioning ball of the spring plunger (22) is used to abut against the end face of the central shaft.

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