Crank quick-mounting structure

Abstract

The invention provides a crank quick-mounting 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 to 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 the connecting shaft is sleeved with a rotating sleeve capable of rotating. 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, and a positioning assembly used for limiting the rotating sleeve when the rotating sleeve is located at the locking position is arranged between the connecting shaft and the rotating sleeve or between the crank and the rotating sleeve. According to the crank quick-mounting structure disclosed by the invention, a user can quickly mount and dismount the crank and the middle shaft without any work, so that the user experience is improved.

Description

Technical Field

[0001] The invention relates to the technical field of bicycles, and in particular to a crank quick-install structure. Background Art

[0002] Bicycles are commonly used means of transportation, which have the advantages of energy saving, environmental protection, convenient use, and small parking space. The pedals of a bicycle are the key components that enable the bicycle to travel. The bicycle pedals are connected to the bicycle center axis through a crank, and the pedals and the cranks are connected by threads.

[0003] As a kind of children's bicycle, a balance bike controls the sliding speed with the feet, which can well train children's sense of balance and reaction ability, promote the development of cerebellum, and focus on training leg strength and hand-eye coordination. A bicycle is a riding vehicle that is pedaled alternately with the legs and braked by hand, which can develop the functions of the left and right brains of children, focusing on training the coordination ability of children's limbs and whole body. At present, a two-in-one bicycle that combines a bicycle and a balance bike has been developed on the market. It can be turned into a balance bike by simply disassembling the crank structure with pedals and the middle axis of the bicycle. However, in the existing two-in-one bicycle structure, the connection method between the crank and the middle axis is still in the traditional connection structure form, which requires the use of special tools, and is inconvenient to disassemble and assemble, resulting in a poor user experience. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome at least one defect of the above-mentioned related technologies and provide a crank quick-install structure, which does not require any work, so that users can quickly install and disassemble the crank and the bottom shaft, thereby improving the user experience.

[0005] The technical solution of the present invention is to provide a crank quick-install structure for connecting a crank and a middle shaft, comprising: A connecting shaft connected to one end of the crank, and a fitting hole for inserting and fitting one end of the middle shaft is provided at one end of the connecting shaft, and a positioning hole radially connected to the fitting hole is provided on the side wall of the connecting shaft; A positioning pin, the positioning pin being slidably inserted into the positioning hole; A rotating sleeve, which can rotate around its own axis and is sleeved on the outside of 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 fitting hole, the rotating sleeve can be rotated to drive the positioning pin to move inward to achieve a tight stop with the pedal central shaft, and move outward to achieve a release from the pedal central shaft; A positioning assembly is arranged between the connecting shaft and the rotating sleeve or between the crank and the rotating sleeve, and is used to limit the rotating sleeve when it is in a locked position.

[0006] 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 in the radial direction of the connecting shaft; a ring-shaped limiting boss is provided at the outer end of the positioning pin, and a first elastic member 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.

[0007] 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 mating hole penetrates through the positioning retaining ring; a positioning assembly for restricting the reverse rotation of the rotating sleeve is provided between the positioning retaining ring and the rotating sleeve and / or between the rotating sleeve and the crank.

[0008] In some embodiments, the positioning assembly includes a positioning slot provided at one end of the positioning retaining ring close to the rotating sleeve, and a positioning insertion plate that is inserted and matched with the positioning groove is provided at one end of the rotating sleeve close to the positioning retaining ring.

[0009] In some embodiments, a second elastic member is provided between the end of the rotating sleeve away from the positioning retaining ring and the crank to simultaneously provide a circumferential rotation restoring force and an axial movement restoring force for the rotating sleeve.

[0010] In some embodiments, an arc-shaped guiding chute is concavely provided at one end of the positioning retaining ring close to the rotating sleeve, and the bottom of one end of the guiding chute communicates with the other end of the positioning retaining ring to form the positioning slot; in the locked state, under the restoring action of the second elastic member, the positioning insertion plate is inserted and positioned in the positioning slot, and when the rotating sleeve is axially pulled until the outer end surface of the positioning insertion plate is flush with the bottom surface of the guiding chute and then rotated by a set angle in the circumferential direction, the positioning pin can be driven to move outwards to achieve unlocking.

[0011] In some embodiments, a ring-shaped avoiding groove is formed on the end surface of the crank close to the connecting shaft, and a receiving groove is concavely provided at one end of the rotating sleeve close to the crank, so that one end of the rotating sleeve forms a ring-shaped sleeve, and the ring-shaped sleeve is axially slidably fitted in the avoiding groove; the second elastic member is located in the receiving groove.

[0012] In some embodiments, the second elastic member is a torsion spring, and the rotation direction of the rotating sleeve is the same as the winding direction of the torsion spring. A first positioning groove is provided at the bottom of the receiving groove, one end of the torsion spring is inserted and fitted in the first positioning groove, and a first positioning post for connecting the first connecting end of the torsion spring is provided in the first positioning groove; a second positioning groove is provided on the end surface of the crank, the other end of the torsion spring is inserted and fitted in the second positioning groove, and a second positioning post for connecting the second connecting end of the torsion spring is provided in the second positioning groove.

[0013] In some embodiments, a positioning boss is provided on the inner peripheral wall of the receiving groove. When the rotating sleeve moves towards the crank side to the limit position, the positioning boss abuts against the outer end face of the annular boss.

[0014] In some embodiments, a spring plunger is provided at the bottom of the fitting hole, and the positioning bead of the spring plunger is used to abut against the end face of the central shaft.

[0015] In summary, compared with the related art, a crank quick-installation structure of the present invention has the following advantages: First of all, in the solution of the present invention, the rotating sleeve, the positioning pin and the crank are made into an integrated structure. By rotating the rotating sleeve, the positioning pin 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, rotating the rotating sleeve can drive the positioning pin to move inwards to achieve tight limit against the outer wall of the pedal central shaft; when unlocking, rotating the rotating sleeve in the reverse direction can drive the positioning pin to move outwards, without the need to rely on any other tools, and the user can operate it by himself; and after disassembling the crank assembly of the bicycle, the structure of the balance bike can be made simpler.

[0016] Secondly, by adding a positioning component structure, reverse rotation of the rotating sleeve is avoided, ensuring the stability of the locking structure; and when rotating and unlocking, through the positioning of the guiding chute, the rotation of the rotating sleeve is ensured to be stable, so that the eccentric channel can more accurately trend the positioning effect to move.

[0017] Thirdly, by setting a torsion spring structure, the rotating sleeve can automatically reset after rotating and unlocking the positioning pin, and the torsion spring is simultaneously used to provide an axial resetting force, so that the rotating sleeve first reversely resets and then axially moves to reset, driving the positioning plug board to be able to be inserted and positioned into the corresponding positioning slot again.

[0018] Other improved features and advantages of the present invention will be described in the subsequent specific embodiments, and part of them will become obvious from the description or be understood by implementing the present invention. The objectives and other advantages of the present invention can be achieved and obtained through the structures specifically pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic diagram of the crank quick-installation structure according to Embodiment 1 of the present invention; Figure 2 is Figure 1 the disassembled structure diagram of the crank quick-installation structure; Figure 3 is Figure 1 the partial vertical cross-sectional view of the crank quick-installation structure; Figure 4 is Figure 1 the horizontal cross-sectional view of the crank quick-installation structure; Figure 5 Partial structure diagram of the crank quick - installation structure of the present invention in the unlocked state; Figure 6 Another - angle partial structure diagram of the crank quick - installation structure of the present invention in the unlocked state; Figure 7 Schematic diagram of the positioning retaining ring structure in the present invention; Figure 8 Schematic diagram of the structure of the rotating sleeve in the present invention; Figure 9 Schematic diagram of the structure of the crank in the present invention; Figure 10 Exploded structure diagram of the crank quick - installation structure of the third embodiment of the present invention.

[0020] Explanation of reference numerals: 1. Crank; 2. Connecting shaft; 3. Fitting hole; 4. Positioning hole; 5. Positioning pin; 6. Rotating sleeve; 7. Limiting boss; 8. First elastic member; 9. Eccentric channel; 10. Positioning retaining ring; 11. Positioning slot; 12. Positioning insert; 13. Second elastic member; 14. Guide chute; 15. Accommodating groove; 16. Annular sleeve; 17. Annular boss; 18. First positioning groove; 19. First positioning post; 20. Second positioning groove; 21. Second positioning post; 22. Spring plunger; 23. Relief groove; 24. Positioning boss; 25. First hook; 26. Positioning card slot; 27. Second hook. Detailed implementation manners

[0021] First of all, those skilled in the art should understand that these implementation manners are only used to explain the technical principles of the embodiments of the present invention, and are not intended to limit the protection scope of the embodiments of the present invention. Those skilled in the art can make adjustments according to needs to adapt to specific application scenarios.

[0022] In the description of the embodiments of the present invention, it should be noted that unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection. For those of ordinary skill in the art, the specific meanings of the above - mentioned terms in the embodiments of the present invention can be understood according to specific situations.

[0023] The present invention will be further described in detail below with reference to the drawings and specific embodiments.

[0024] Embodiment 1: Refer to Figures 1 to 9As shown in the figure, an embodiment of the present invention discloses a crank quick - installation structure for realizing the quick insertion and installation of the crank 1 and the bottom bracket spindle. Its structure includes a connecting shaft 2. One end of the connecting shaft 2 is connected to one end of the crank 1. Preferably, the connecting shaft 2 and the crank 1 are integrally formed to ensure the structural strength and simplify the production process.

[0025] On the other end of the connecting shaft 2, a fitting hole 3 extending axially is formed for the insertion and fitting of one end of the bottom bracket spindle. In the prior art, the end of the bottom bracket spindle 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 opened on the side wall of the connecting shaft 2, which radially communicates with the fitting hole 3. A positioning pin 5 that can telescopically slide along its depth direction is fitted in the positioning hole 4. A rotating sleeve 6 is sleeved outside the connecting shaft 2, and the rotating sleeve 6 can rotate around its own axis. The outer end of the positioning pin 5 is in linkage cooperation 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 in the positioning hole. When one end of the bottom bracket spindle is inserted into the fitting hole 3, rotating the rotating sleeve 6 can drive the positioning pin 5 to move inwards to achieve abutting and limiting against the outer wall of the pedal bottom bracket spindle. When unlocking, rotating the rotating sleeve 6 in the reverse direction can drive the positioning pin 5 to move outwards.

[0026] In the above - mentioned structure, preferably, there are two symmetrically arranged positioning pins 5, and the two positioning pins abut and limit on the side wall of the end of the bottom bracket spindle to ensure the stability and reliability of the locking force.

[0027] Of course, in some other embodiments, when the size permits, four positioning pins 5 corresponding to the four side edges of the outer wall of the bottom bracket spindle can also be set. In the extreme case, only one positioning pin 5 can be set to abut against any one side wall on the outer wall of one end of the bottom bracket spindle.

[0028] In this embodiment, more specifically, referring to the appendix Figure 6 , both of the two positioning holes 4 are countersunk through - holes, and the large - diameter end of the countersunk through - hole is located at the outer end of the radial direction of the connecting shaft 2. An annular limiting boss 7 is provided at the outer end of the positioning pin 5. A first elastic member 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 can prevent the positioning pin 5 from falling into the fitting hole 3 inwards, and the first elastic member 8 can drive the positioning pin 5 to always have a tendency to move outwards. When the rotating sleeve 6 is rotated to unlock, the positioning pin 5 can quickly reset outwards. Preferably, the first elastic member 8 here is a cylindrical small spring, and the small spring is sleeved 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.

[0029] As a preferred structural form, referring to the appendix Figure 2, in the above structure, an eccentric channel 9 is provided on the inner peripheral wall of the rotating sleeve 6, and the outer end of the positioning pin 5 abuts against the inner wall of the eccentric channel 9. When the rotating sleeve 6 is rotated circumferentially, under the action of the eccentric channel 9 on its inner wall, the positioning pin 5 can move within the positioning hole 4. In this embodiment, there are two positioning pins 5. Correspondingly, two sections of eccentric channels 9 that are centrosymmetric along its central axis are provided on the inner wall of the rotating sleeve 6. When the rotating sleeve 6 is rotated circumferentially, under the drive of the two sections of eccentric channels 9, the two positioning pins 5 move inwards or outwards synchronously. More specifically, in order to ensure that the outer end of the positioning pin 5 fits more accurately with the inner wall of the eccentric channel 9, the outer ends of the two positioning pins 5 are both provided as arc surfaces.

[0030] In this embodiment, a positioning retaining ring 10 is connected to the end of the connecting shaft 2 away from the crank 1. In this structure, the positioning retaining ring 10 is connected to the outer end face of the connecting shaft 2 through a connecting bolt; in addition, the outer end of the fitting hole 3 penetrates through the positioning retaining ring 10, that is, a through hole corresponding to the fitting hole 3 is provided in the middle of the positioning retaining ring 10; a positioning component for restricting 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 Attachments Figure 2 , 3 and 6, 7, the positioning component includes a positioning slot 11 provided at one end of the positioning retaining ring 10 close to the rotating sleeve 6, and a positioning insertion plate 12 is provided at one end of the rotating sleeve 6 close to the positioning retaining ring 10. During use, after rotating the rotating sleeve 6 to drive the positioning pin 5 to abut against and be limited by the side wall of the central shaft, axially push the rotating sleeve 6 to drive the positioning insertion plate 12 to be inserted and fitted into the positioning slot 11 to limit the reverse rotation of the rotating sleeve 6 and ensure the stability of the positioning pin 5 locking structure.

[0031] More specifically, in the above structure, a second elastic member 13 is provided between the end of the rotating sleeve 6 away from the positioning retaining ring 10 and the crank 1 to provide a circumferential rotation restoring force and an axial movement restoring force for the rotating sleeve 6 at the same time. That is, when rotating the rotating sleeve 6 to drive the positioning pin 5 to move outwards and unlock, after releasing the external force, under the restoring action of the second elastic member 13, the rotating sleeve 6 can rotate reversely and reset, and also provide a restoring force axially to drive the positioning insertion plate 12 to be inserted and reset into the positioning slot 11.

[0032] In this embodiment, in order to further ensure the stability of the rotation of the rotating sleeve 6, an arc-shaped guiding chute 14 is concavely provided at one end of the positioning retaining ring 10 close to the rotating sleeve 6, and the center of the guiding chute 14 coincides with the center of the rotating sleeve 6; the bottom of the guiding chute 14 at the end opposite to the rotation direction of the rotating sleeve 6 communicates with the other end of the positioning retaining ring 10 to form a positioning slot 11, that is, it is a communicating groove; in the locked state, under the circumferential and axial resetting actions of the second elastic member 13, the insertion plate is inserted and positioned in the positioning slot 11, and the rotating sleeve 6 cannot rotate in the reverse direction after being inserted and limited, ensuring the stability of the locking structure; when unlocking is required, first pull the rotating sleeve 6 axially until the outer end face of the positioning insertion plate 12 is flush with the bottom surface of the guiding chute 14, and then rotate the rotating sleeve 6 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 reverse direction until its inner end separates from the outer wall of the central axis, releasing the pressing and limiting force, and at this time the crank 1 can be pulled out from the end of the central axis.

[0033] On the other hand, referring to Figure 2 , 3 , and 4, in this embodiment, a receiving groove 15 is concavely provided at one end of the rotating sleeve 6 close to the crank 1, so that one end of the rotating sleeve 6 forms an annular sleeve 16. An annular boss 17 is provided at one end of the crank 1 close to the rotating sleeve 6, and the outer end of the annular boss 17 is slidably fitted in the annular sleeve 16, and the second elastic member 13 is located in the receiving groove 15. In this structure, the annular sleeve 16 and the annular boss 17 are slidably fitted so that a part of the receiving groove 15 forms a closed chamber, which plays a role in dust prevention and improves the service life of the second elastic member 13. In this structure, referring to Figure 3 and 4 , the annular boss 17 is integrally formed on the end face of the crank 1, and a part of 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, so as to increase the length of the cylindrical outer wall part of the connecting column, so that without increasing the thickness of the crank 1, the overlapping area of the annular sleeve 16 and the annular boss 17 is increased, effectively ensuring the axial stretching space of the rotating sleeve 6 and at the same time ensuring the dust prevention effect.

[0034] In the above structure, when unlocking and opening, each time it is necessary to first pull the rotating sleeve 6 axially towards the crank 1 by a certain distance before it can be rotated. To avoid excessive movement stroke resulting in failures, referring to Figure 3 , in this embodiment, corresponding positioning bosses 24 are convexly provided on the inner peripheral wall of the receiving groove 15. When the rotating sleeve 6 moves towards the crank 1 to a certain range and the bosses abut against the end face of the annular boss 17, it cannot move further, playing a role in stroke limiting.

[0035] In this embodiment, preferably, referring to Figure 8 and9 The second elastic member 13 is a cylindrical torsion spring, which has the circumferential elastic reset function of a torsion spring and can also play an axial elastic reset function after being axially compressed. Specifically, the torsion spring has a structure similar to a compression spring axially; and the rotation direction of the rotating sleeve 6 is the same as the winding direction of the torsion spring. A first positioning groove 18 is provided at the bottom of the accommodating groove 15. One axial end of the torsion spring is inserted and fitted in the first positioning groove 18, and a first positioning post 19 for connecting the first connecting end of the torsion spring is provided in the first positioning groove 18; a second positioning groove 20 is concavely provided on the outer end surface of the annular boss 17. The other axial end of the torsion spring is inserted and fitted in the second positioning groove 20, and a second positioning post 21 for connecting the second connecting end of the torsion spring is provided in the second positioning groove 20.

[0036] In addition, refer to the appendix Figure 3 At the bottom of the fitting hole 3, a spring plunger 22 is provided, and the positioning bead of the spring plunger 22 is used to abut against the end face of the central shaft. After the crank 1 and the intermediate shaft are assembled, the spring plunger 22 is in a compressed state. During subsequent disassembly, the elastic reset force of the spring plunger 22 can facilitate the separation of the crank 1 and the central shaft.

[0037] In some other embodiments, guide slopes can also be provided on one side of the two positioning pins 5 close to 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. In addition, anti-slip treatment is performed on the outer peripheral wall of the rotating sleeve 6, such as adding anti-slip convex lines, arc-shaped grooves matching the fingers, etc. On the other hand, rotation direction marks can also be added to improve the operation convenience.

[0038] Embodiment 2: The structure of this embodiment is basically the same as that of Embodiment 1. The only difference is that a positioning convex ring (not shown in the figure) is integrally formed at one end of the connecting shaft 2 away from the crank 1, that is, there is no need to additionally install a positioning retaining ring 10. The positioning convex ring plays the same function as the positioning retaining ring 10. However, after such a setting, the rotating sleeve 6 needs to be set as a split structure and is installed outside the connecting shaft 2 in a radially clamped and fitted form. In addition, the inner diameter of the torsion spring is larger than the outer diameter of the positioning convex ring to facilitate installation; the structures of other parts are the same as those in Embodiment 1 and will not be elaborated here.

[0039] Embodiment 3: Refer to the appendix Figure 10, the structure of this embodiment is basically the same as that of the first embodiment. The only differences are the position of the positioning component and the connection method of the elastic member. Specifically, the positioning component includes an annular guiding chute 14 that is concavely provided at one end of the crank 1 close to the rotating sleeve 6. The bottom of one end of the guiding chute 14 further concavely forms a positioning slot 11. One end of the rotating sleeve 6 close to the crank 1 is provided with a positioning plug 12 that is inserted and matched with the positioning slot 11; and a second elastic member 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 rotation restoring force and axial movement restoring force at the same time. The second elastic member 13 in this structure is the same as that in the first embodiment and is a cylindrical torsion spring.

[0040] In addition, regarding the connection method of the second elastic member, in this embodiment, a receiving groove 15 for receiving the second elastic member 13 is provided at the end of the rotating sleeve 6 away from the crank 1. A positioning jack (not shown in the figure) that axially communicates to the other end face is provided at the bottom of the receiving groove 15. One end of the torsion spring is provided with a first hook that is inserted and matched with the first jack. A positioning card slot extending along its axial direction is provided on the outer peripheral wall of the positioning retaining ring 10 close to the rotating sleeve 6. The other end of the torsion spring is provided with a second hook that is clamped and matched with the positioning card slot. When installing the torsion spring, first pass the end provided with the first hook through the positioning jack, and then rotate a certain angle so that the hook part of the first hook is clamped and positioned with the side wall of the positioning jack. Then install the positioning retaining ring 10 so that the second hook at the other end of the torsion spring is radially clamped into the positioning card slot to realize the connection and positioning of the two ends of the torsion spring.

[0041] Similarly, in order to achieve dust prevention for the torsion spring, an annular sleeve 16 can be provided on the radially outer side of the end of the rotating sleeve 6 close to the positioning retaining ring 10, and the annular sleeve 16 is slidably sleeved outside the positioning retaining ring 10. In addition, the difference between this structure and the first embodiment is that when unlocking, it is necessary to first move the rotating sleeve 6 towards the end away from the crank 1 until the positioning plug 12 is separated from the positioning slot 11 before it can be rotated. Since the positioning structure and principle of the positioning component are similar to those in the first embodiment, no specific illustrated structure is shown in this embodiment.

[0042] In the description of the embodiments of the present invention, it should be noted that in the description of the present invention, terms such as "inside, outside", "bottom", etc. indicating directions or positional relationships are based on the directions or positional relationships 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, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0043] In the description of the present invention, the description referring to terms such as "this embodiment", "some embodiments", etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0044] As described above, it is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed by the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A crank quick - mounting structure for connecting a crank (1) and a bottom bracket, characterized in that: including a connecting shaft (2) connected to one end of the crank (1), and a fitting hole (3) for inserting and fitting one end of the middle shaft is formed at one end of the connecting shaft (2), and a positioning hole (4) radially communicating with the fitting hole (3) is formed on the side wall of the connecting shaft (2); a positioning pin (5) slidably inserted into the positioning hole (4); a rotating sleeve (6) sleeved outside the connecting shaft (2) and capable of rotating around its own axis, and the outer end of the positioning pin (5) is in linkage cooperation with the rotating sleeve (6). When one end of the middle shaft is inserted into the fitting hole (3), rotating the rotating sleeve (6) can drive the positioning pin (5) to move inward to abut and limit against the pedal middle shaft, and move outward to disengage and unlock from the pedal middle shaft; a positioning assembly arranged between the connecting shaft (2) and the rotating sleeve (6) or between the crank (1) and the rotating sleeve (6) for limiting the rotating sleeve (6) when it is in the locked position.

2. The quick-attachment structure of the crank according to claim 1, wherein: The positioning hole (4) is a counterbore through hole, and the large-diameter end of the counterbore through hole is located at the outer end of the radial direction of the connecting shaft (2); an annular limiting boss (7) is arranged at the outer end of the positioning pin (5), and a first elastic member (8) is arranged between the bottom of the large-diameter end of the counterbore through hole and the limiting boss (7); an eccentric channel (9) is arranged on the inner peripheral wall of the rotating sleeve (6), and the outer end of the positioning pin (5) abuts against the inner wall of the eccentric channel (9).

3. The quick-attachment structure of the crank according to claim 1, characterized in that: A positioning retaining ring (10) is connected to one end of the connecting shaft (2) away from the crank (1), and the outer end of the fitting hole (3) penetrates through the positioning retaining ring (10); the positioning assembly is arranged between the positioning retaining ring (10) and the rotating sleeve (6).

4. The quick-release crank structure according to claim 3, characterized in that: The positioning assembly includes a positioning slot (11) arranged at one end of the positioning retaining ring (10) close to the rotating sleeve (6), and a positioning insertion plate (12) for inserting and fitting with the positioning groove is arranged at one end of the rotating sleeve (6) close to the positioning retaining ring (10).

5. The quick crank mounting structure according to claim 4, characterized in that: A second elastic member (13) is arranged between one end of the rotating sleeve (6) away from the positioning retaining ring (10) and the crank (1) to provide a circumferential rotation restoring force and an axial movement restoring force for the rotating sleeve (6) at the same time.

6. The quick-attachment structure of the crank according to claim 5, wherein: An arc-shaped guiding chute (14) is concavely arranged at one end of the positioning retaining ring (10) close to the rotating sleeve (6), and the bottom of one end of the guiding chute (14) communicates with the other end of the positioning retaining ring (10) to form the positioning slot (11); when in the locked state, under the restoring action of the second elastic member (13), the positioning insertion plate (12) is inserted and positioned in the positioning slot (11), and after axially pulling the rotating sleeve (6) until the outer end face of the positioning insertion plate (12) is flush with the bottom surface of the guiding chute (14) and then rotating a set angle in the circumferential direction, the positioning pin (5) can be driven to move outward to achieve unlocking.

7. The quick-release crank structure according to claim 6, wherein: A receiving groove (15) is concavely provided at one end of the rotating sleeve (6) near the crank (1) so that one end of the rotating sleeve (6) forms an annular sleeve (16). An annular boss (17) is provided at one end of the crank (1) near the rotating sleeve (6), and the outer end of the annular boss (17) is slidably fitted inside the annular sleeve (16); the second elastic member (13) is located inside the receiving groove (15).

8. The quick-attachment structure of the crank according to claim 7, characterized in that: The second elastic member (13) is a torsion spring, and the rotating direction of the rotating sleeve (6) is the same as the winding direction of the torsion spring. A first positioning groove (18) is provided at the bottom of the receiving groove (15). One end of the torsion spring is inserted and fitted inside the first positioning groove (18), and a first positioning post (19) for connecting the first connection end of the torsion spring is provided inside the first positioning groove (18); a second positioning groove (20) is provided on the outer end face of the annular boss (17). The other end of the torsion spring is inserted and fitted inside the second positioning groove (20), and a second positioning post (21) for connecting the second connection end of the torsion spring is provided inside the second positioning groove (20).

9. The quick-attachment structure of the crank according to claim 8, characterized in that: A positioning boss (24) is provided on the inner peripheral wall of the receiving groove (15). When the rotating sleeve (6) moves towards the crank (1) side to the limit position, the positioning boss (24) abuts against the outer end face of the annular boss (17).

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

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