Optimally-installed crank system

Abstract

The utility model relates to an optimal installation crank system which comprises a crank and a pedal and further comprises an adapter, the adapter is connected with the crank and used for being connected with a center shaft in a five-way joint, matching cavities extending in the axis direction of the center shaft are formed in the two ends of the center shaft, and the adapter can penetrate through the matching cavities from one ends of the matching cavities; the connecting assembly is used for being connected with the adapter, the connecting assembly is provided with a locking position and a releasing position, and in the locking position, the middle shaft is matched with the connecting assembly so that the matching cavity can be connected with the adapter in a locked mode; and at the release position, the middle shaft is separated from the connecting assembly, so that the crank can be separated from the middle shaft in the axial direction of the adapter. The device has the advantages that the comfort of the child in the riding mode is improved, the child can exert force conveniently, and the safety of leg movement of the child in the sliding mode is guaranteed.

Description

Technical Field

[0001] The present invention relates to the field of bicycle cranks, and more particularly to a crank system. Background Art

[0002] At present, in order to facilitate children to practice riding, a crank quick-release and quick-installation structure is usually designed on children's bicycles to realize the free switching between riding mode and sliding mode. The crank quick-release and quick-installation structure is plugged into the middle axis assembly at the five-way position of the frame. Specifically, the left and right cranks are directly inserted into the adapters fixed at both ends of the middle axis assembly, and the fast installation can be completed by using the pins designed on the adapter to snap into the slots inside the cranks. When disassembling, press the button on the adapter to retract the pin to directly withdraw the crank, thereby achieving the purpose of quickly disassembling and assembling the crank.

[0003] However, since the adapter is integrally fixed to the bottom bracket assembly on the bicycle and protrudes a long distance from the five-way bracket of the frame, when children use the gliding mode to slide, the adapter is very likely to scratch the children's legs, and the protruding adapter will also affect the movement of the children's legs. In addition, the protruding adapter makes the distance between the two ends of the crank longer, thereby making the pedal spacing larger, forcing children to ride with their legs apart in the riding mode, which is not conducive to strength and body growth. Utility Model Content

[0004] In order to improve the comfort of children in riding mode, facilitate children to exert force, and ensure the safety of children's leg activities in sliding mode, the present application provides an optimized crank system.

[0005] The present application provides an optimized crank system adopting the following technical solution:

[0006] A crank system includes a crank and a pedal, and further includes:

[0007] An adapter, the adapter is connected to the crank and used to connect to the middle shaft inside the five-way bracket, the middle shaft is formed with matching cavities extending along its axial direction at both ends, and the adapter can be inserted into the matching cavity from one end of the matching cavity;

[0008] A connecting assembly is used to connect with the adapter, and the connecting assembly has a locking position and a releasing position. In the locking position, the middle shaft cooperates with the connecting assembly to lock the matching cavity and the adapter in connection; in the releasing position, the middle shaft is separated from the connecting assembly so that the crank can be detached from the middle shaft along the axial direction of the adapter.

[0009] By adopting the above technical solution, the adapter is integrated with the crank. When the crank is installed, the adapter is inserted into the matching cavity inside the middle shaft. When the child uses the sliding mode for exercise, there are no protrusions at both ends of the middle shaft, which will not interfere with the activities of the child's legs, thereby ensuring the safety and comfort of the child during exercise. Since the adapter is fixed to the crank instead of being additionally fixed at both ends of the middle shaft, compared with the traditional method, not only the weight of the middle shaft assembly is reduced, that is, the weight of the bicycle body is also lighter, and the child is more labor-saving when using the sliding mode, and it is more convenient to process and manufacture the adapter, thereby reducing the manufacturing cost. Moreover, compared with the traditional method, this improved method does not increase the length of the middle shaft additionally, so the distance between the two pedals can be shortened, so that the child's legs can be closer together when riding, which is more conducive to exerting force. Since the distance between the two pedals can be shortened, the height of the five-way bracket can be further reduced on the basis of meeting the pedal installation specifications, so that the center of gravity of the bicycle can be lowered, and the child's leg activities can be more stretched in the riding mode, which is more conducive to exerting force.

[0010] Preferably, the connecting assembly includes a limit member, and the limit member is provided on one of the inner wall of the mating cavity and the outer wall of the adapter, and a limit groove is provided on the other of the two. The limit member can move radially along the mating cavity to switch between the locking position and the release position. In the locking position, the limit member is at least partially engaged in the limit groove, and in the release position, the limit member is disengaged from the limit groove.

[0011] By adopting the above technical solution, the adapter is engaged with the central axis by utilizing the engagement between the limiting member and the limiting groove, thereby limiting the movement of the adapter.

[0012] Preferably, the limiting member is arranged on the outer wall of the adapter, and a through hole for the limiting member to move is opened on the adapter, and the limiting groove is arranged on the inner wall of the matching cavity.

[0013] By adopting the above technical solution, the limit member is set on the outer wall of the adapter, and the connecting component is arranged inside the adapter. When the adapter is inserted into the matching cavity inside the central axis, it is easier to lock the limit member and the limit groove.

[0014] Preferably, an accommodating cavity is provided inside the adapter, and the limiting member is penetrated through the cavity wall of the accommodating cavity along the radial direction of the accommodating cavity. The connecting assembly also includes a pressing assembly, which is provided in the accommodating cavity and cooperates with the limiting member, and the pressing assembly can move the limiting member from the locking position to the releasing position.

[0015] Preferably, the pressing assembly includes a pressing member and an elastic member. The pressing member cooperates with the limiting member. One end of the elastic member abuts against the pressing member and the other end abuts against the end wall of the adapter. The pressing member is provided with a first inclined surface, the limiting member is provided with a second inclined surface that cooperates with the first inclined surface, a third inclined surface is provided at one end of the limiting member away from the pressing member, and a fourth inclined surface that cooperates with the third inclined surface is formed on the inner wall of the central axis.

[0016] By adopting the above technical solution, in the locked position, the elastic member is in a stretched state and the limiting member extends radially out of the receiving cavity, and a part of the end of the pressing member away from the elastic member extends out of the receiving cavity; in the released position, the elastic member is in a compressed state and the limiting member is located within the receiving cavity.

[0017] Preferably, the pressing member is provided with a first inclined surface, and the limiting member is provided with a second inclined surface that cooperates with the first inclined surface; a stop groove extending along the length direction thereof is provided on the first inclined surface, a stop portion is provided on the second inclined surface, and the stop portion is slidably connected to the stop groove.

[0018] By adopting the above technical solution, the stop groove and the stop portion are provided to prevent the limiting member from detaching from the pressing member.

[0019] Preferably, both the stop groove and the stop portion are T-shaped; alternatively, the stop groove is in a "C" shape and the stop portion is in an L shape.

[0020] Preferably, the adapter includes a bushing with a receiving cavity formed therein and a plurality of first positioning ribs fixed on the outer wall of the bushing and extending along the axis of the bushing. The plurality of first positioning ribs are arranged around the axis of the bushing. A plurality of second positioning ribs are circumferentially arranged around the axis of the central axis on the inner wall of the mating cavity. The space between two adjacent second positioning ribs forms a positioning chute that cooperates with the first positioning ribs. The fourth inclined surface is formed on the end face of the second positioning rib, and a fifth inclined surface that cooperates with the fourth inclined surface is machined on the end face of each first positioning rib.

[0021] By adopting the above technical solution, through the limiting effect of the first positioning ribs and the positioning chutes, the relative rotation between the adapter and the central axis is restricted, and through the cooperation of the fourth inclined surface and the fifth inclined surface, it is convenient to insert the adapter into the mating cavity.

[0022] Preferably, the through hole is formed between two adjacent first positioning ribs, and the distance between two adjacent first positioning ribs on both sides of the through hole is greater than the distance between the remaining adjacent first positioning ribs.

[0023] By adopting the above technical solution and setting different spacings between the first positioning ribs, the matching position of the limiting member and the limiting groove can be quickly determined during installation, that is, the installation angle of the adapter and the central axis can be determined, which is convenient for quick installation.

[0024] Preferably, a limit nut for limiting the insertion depth of the adapter is sleeved on the central shaft, and the limit nut is arranged at an end of the central shaft away from the crankset.

[0025] By adopting the above technical solution and providing a limiting nut, when the adapter moves into position, the end wall of the crank contacts the limiting nut to limit the installation position of the adapter.

[0026] In summary, the present application includes at least one of the following beneficial technical effects:

[0027] 1. This application integrates the adapter directly on the crank. When the crank is removed, there are no protrusions on both ends of the middle axis when the child practices riding in the sliding mode, which will not interfere with the child's leg movements, ensuring the safety and comfort of the child during practice. At the same time, the weight of the middle axis assembly is reduced, that is, the weight of the bicycle body is also lighter, and children can save more effort when using the sliding mode; this installation method can also shorten the distance between the two pedals and further reduce the height of the bottom bracket, so that the child's leg movements can be more stretched in the riding mode, which is more conducive to exerting force;

[0028] 2. A first positioning rib is provided on the adapter, and a positioning groove matched with the first positioning rib is provided on the inner wall of the central axis to limit the relative rotation of the adapter and the central axis. Moreover, by setting different spacings between the two first positioning ribs, it is convenient to quickly determine the relative position of the adapter and the central axis during installation, so as to achieve quick installation; BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is an exploded view of the crank system of the present application.

[0030] Figure 2 It is a cross-sectional schematic diagram of the optimal crank system of the present application.

[0031] Figure 3 It is a schematic diagram of the cooperation between the pressing part and the limiting part.

[0032] Figure 4 This is a partial exploded view made to reflect the structure of the stop groove and the stop part.

[0033] Figure 5 It is a schematic diagram to reflect the connection between the adapter and the crank.

[0034] Figure 6 It is a schematic diagram of the pressing member of the present application.

[0035] Explanation of the reference numerals in the accompanying drawings: 01, five-way joint; 02, middle shaft; 021, matching cavity; 022, limiting groove; 024, fourth inclined surface; 025, positioning slide groove; 03, chainring; 1, crank; 11, limiting slide groove; 2, pedal; 3, adapter; 31, through hole; 32, accommodating cavity; 33, sleeve; 34, first positioning rib; 341, fifth inclined surface; 4, connecting assembly; 41, limiting member; 411, second inclined surface; 412, stopper; 413, third inclined surface; 42, pressing assembly; 421, pressing member; 4211, button; 4212, spindle; 4213, first inclined surface; 4214, stopping groove; 422, elastic member; 5, second positioning rib; 6, limiting nut; 7, vibration sensing light. DETAILED DESCRIPTION

[0036] The following is combined with Figure 1-5 This application is described in further detail.

[0037] The present application embodiment discloses a crank system. Figure 1 and Figure 2 The crank system includes a crank 1 and a pedal 2, and also includes an adapter 3 connected to the crank 1 and used to connect to the middle shaft 02 inside the five-way 01, and a connecting assembly 4 arranged on the connecting assembly for fixing the adapter 3 to the middle shaft 02. Both ends of the middle shaft 02 are formed with a matching cavity 021 extending along its axial direction, and the adapter 3 can be inserted into the matching cavity 021 from one end of the matching cavity 021. The connecting assembly 4 has a locking position and a releasing position. In the locking position, the middle shaft 02 cooperates with the connecting assembly 4 so that the matching cavity 021 and the adapter 3 are locked and connected, thereby realizing a quick connection between the crank 1 and the middle shaft 02. In the releasing position, the middle shaft 02 is separated from the connecting assembly 4 so that the crank 1 can be separated from the middle shaft 02 along the axial direction of the adapter 3, thereby realizing a quick disassembly of the crank 1 and the middle shaft 02. By integrating the adapter 3 with the crank 1, when the crank 1 and the middle axis 02 are separated, there are no protrusions at both ends of the middle axis 02, which allows children to practice riding in the gliding mode without interfering with the movement of the children's legs, thereby ensuring the safety and comfort of children during practice.

[0038] Such a quick-disassembly structure also brings other beneficial effects:

[0039] (1) Reduced body weight. Since the adapter 3 is fixed to the crank 1 instead of being additionally fixed to the two ends of the middle axis 02, compared with the traditional method, not only the weight of the middle axis 02 assembly is reduced, but in this application, the weight of the middle axis 02 assembly can be reduced by up to 550g, so that when children use the sliding mode, the weight of the bicycle body is also lighter, and riding is more labor-saving.

[0040] (2) It is easy to process the adapter 3. Since the adapter 3 is connected to the crank 1 as a whole, and does not need to be processed as a whole with the middle shaft 02, it is easier to process and manufacture the adapter 3, thereby reducing the manufacturing cost.

[0041] (3) The distance between the two pedals 2 can be shortened. Compared with the traditional method, this improved method does not increase the length of the middle axis 02, so the distance between the two pedals 2 can be shortened. In this application, the distance between the two pedals 2 can be shortened by up to 50 mm, so that the legs of children can be closer together when riding, which is more conducive to exerting force.

[0042] (4) The height of the bottom bracket 01 can be lowered. Since the distance between the two pedals 2 can be shortened, the height of the bottom bracket 01 can be further lowered on the basis of meeting the installation specifications of the pedals 2. In this application, the height of the bottom bracket 01 can be lowered by 14 mm to 20 mm. This can make the center of gravity of the bicycle lower, and the child's leg movements can be more stretched in the riding mode, which is more conducive to exerting force.

[0043] Reference Figure 2 The connection assembly 4 includes a limiter 41. The limiter 41 is provided on one of the inner wall of the matching cavity 021 and the outer wall of the adapter 3, and a limit groove 022 is provided on the other of the two. The limiter 41 is movable between a locking position and a release position along the radial direction of the matching cavity 021. In the locking position, the limiter 41 is at least partially engaged in the limit groove 022. In the release position, the limiter 41 is separated from the limit groove 022. In this embodiment, the limit groove 022 is provided inside the matching cavity 021, the limiter 41 is provided on the outer wall of the adapter 3, and the limiter 41 is a limit pin. A through hole 31 is provided on the side wall of the adapter 3 for the limiter 41 to extend out. It can be understood that in the locking position, the limiter 41 is located inside the limit groove 022, and interference can be formed between the matching cavity 021 and the adapter 3, thereby preventing the adapter 3 from escaping from both ends of the central axis 02. When the crank 1 needs to be removed, the connecting assembly 4 is in the released position. At this time, the limiting member 41 is disengaged from the limiting groove 022, that is, the interference between the matching cavity 021 and the adapter 3 disappears, and the crank 1 can be quickly removed. The operation is simple and convenient, which improves the efficiency of disassembly and assembly.

[0044] Reference Figure 2-Figure 4 The connecting component 4 also includes a pressing component 42. An accommodating cavity 32 is provided inside the adapter 3. A limiting component 41 is penetrated through the cavity wall of the accommodating cavity 32 along the radial direction of the accommodating cavity 32. The pressing component 42 is provided in the accommodating cavity 32 and cooperates with the limiting component 41. The pressing component 42 can move the limiting component 41 from the locking position to the releasing position.

[0045] Reference Figure 3 , Figure 4Specifically, the pressing assembly 42 includes a pressing member 421 and an elastic member 422. One end of the elastic member 422 abuts against the pressing member 421 and the other end abuts against the adapter 3. The pressing member 421 cooperates with the limiting member 41. The pressing member 421 extends along the axial direction of the adapter 3 and can slide a certain distance along the axial direction of the accommodating cavity 32. In this embodiment, the pressing member 421 is made of elastic material, and the pressing member 421 includes a button 4211 disposed on the end surface of the crank 1 and a core shaft 4212 fixed to the button 4211 and extending along the axial direction of the accommodating cavity 32. The elastic member 422 is a spring.

[0046] A first inclined surface 4213 is provided on the core shaft 4212, and a second inclined surface 411 is provided on the limiting member 41 to cooperate with the first inclined surface 4213. Specifically, two limiting members 41 are provided, both extending along the radial direction of the accommodating cavity 32, and the two limiting members 41 are symmetrically arranged along the axial direction of the adapter 3. Two first inclined surfaces 4213 of the core shaft 4212 are also symmetrically arranged along the axial direction of the adapter 3, respectively cooperating with the two limiting members 41. The upper first inclined surface 4213 (away from the ground) is inclined upward from the direction of the crank 1 to the direction of the main shaft, and in order to cooperate with the first inclined surface 4213, the second inclined surface 411 has the same inclination direction as the first inclined surface 4213, that is, the first inclined surface 4213 and the second inclined surface 411 are wedge-shaped matching structures.

[0047] Furthermore, a third inclined surface 413 is disposed at one end of the stopper 41 away from the pressing member 421, and a fourth inclined surface 024 is formed on the inner wall of the central axis 02 to match the third inclined surface 413. In this embodiment, the third inclined surface 413 and the fourth inclined surface 024 are also wedge-shaped matching structures.

[0048] During installation, the adapter 3 is inserted into the matching cavity 021. The two stoppers 41 move along the first inclined surface 4213 toward the central axis of the adapter 3 under the cooperation of the third inclined surface 413 and the fourth inclined surface 024 until they are retracted to the bottom position of the first inclined surface 4213, and the elastic member 422 is compressed. As the adapter 3 continues to move into the matching cavity 021, the stopper 41 continues to be interfered by the inner wall of the central axis 02. The elastic member 422 gives the stopper 41 a force to move back in the radial direction of the pressing member 421. When the adapter 3 is inserted into the set position, the interference of the inner wall of the central axis 02 on the stopper 41 is released, so that the stopper 41 pops out under the restoring force of the elastic member 422 and matches with the stopper groove 022. During disassembly, the button 4211 is pressed from the end face of the crank 1, thereby pushing the pressing member 421 and the limiting member 41 to move synchronously, and the limiting member 41 is squeezed out of the limiting groove 022 by utilizing the third inclined surface 413. Under the action of the elastic force of the elastic member 422, the interference between the limiting member 41 and the limiting groove 022 is released, thereby realizing the switching of the connecting component 4 from the locked position to the released position.

[0049] Referring to Figure 4 , to ensure that the limiting member 41 does not come out of the through hole 31, a stop groove 4214 extending along its length direction is provided on the first inclined surface 4213, and a stop portion 412 is provided on the second inclined surface 411. The stop portion 412 is slidably connected with the stop groove 4214. Specifically, the stop groove 4214 is in a "C" shape, and the stop portion 412 is in an L shape. In this embodiment, the L-shaped stop portion 412 is formed by opening a "C" shaped groove on one side of the limiting member 41 in the axial direction. During assembly, the stop groove 4214 and the "C" shaped groove on the limiting member 41 are buckled together, so that the stop portion 412 can be located in the stop groove 4214. Through the sliding connection between the stop portion 412 and the stop groove 4214, it can be ensured that the limiting member 41 is always connected with the pressing member 421 during the sliding process in the through hole 31, so that the limiting member 41 does not come out of the through hole 31, ensuring the use effect of the quick connection structure of the crank 1. In addition, the cooperation between the stop portion 412 and the "C" shaped stop groove 4214 enables when the pressing member 421 is pressed to drive the first inclined surface 4213 to move towards the central axis 02 direction, the stop groove 4214 on the first inclined surface 4213 drives the lower limiting member 41 to move away from the limiting groove 022 and move upward (in the direction away from the ground) to the bottom position of the first inclined surface 4213 through the cooperation with the stop portion 412, completing the unlocking of the lower limiting member 41.

[0050] Referring to Figure 1 and Figure 5 , to limit the relative rotation between the adapter 3 and the central axis 02, the adapter 3 includes a bushing 33 with an accommodation cavity 32 provided inside and a plurality of first positioning ribs 34 fixed outside the bushing 33 and extending along the axis direction of the bushing 33. The plurality of first positioning ribs are arranged around the axis of the bushing 33. A plurality of second positioning ribs 5 are circumferentially arranged on the inner wall of the mating cavity 021 around the axis of the central axis 02. The space between two adjacent second positioning ribs 5 forms a positioning sliding groove 025 that mates with the first positioning ribs. The fourth inclined surface 024 is opened on the end surface of the second positioning rib 5. A fifth inclined surface 341 that mates with the fourth inclined surface 024 is also opened on the end surface of the plurality of first positioning ribs 34.

[0051] Referring to Figure 5, since the limiting member 41 needs to be engaged with the limiting groove 022, that is, the adapter 3 and the central axis 02 have a certain relative position, in order to facilitate the customer's assembly. The through hole 31 is opened between the two first positioning ribs 34, and the distance between the two adjacent first positioning ribs 34 on both sides of the through hole 31 is greater than the distance between the other two adjacent first positioning ribs 34. In coordination with this, the position of the positioning slide 025 is set to match the position of the first positioning rib 34, so that the crank 1 has only two assembly positions, ensuring that the two cranks 1 will not be installed upside down, and realizing a fool-proof installation. During assembly, according to the setting position of the through hole 31, the installation angle of the crank 1 and the central axis 02 is adjusted so that the first positioning rib 34 is aligned with the positioning slide 025, and then the adapter 3 is inserted into the matching cavity 021 with the help of the cooperation between the fourth inclined surface 024 and the fifth inclined surface 341.

[0052] At the same time, in order to facilitate the connection between the adapter 3 and the crank 1, the adapter 3 is plugged into the crank 1. A limiting slide groove 11 is processed on the inner wall of the crank 1 shaft hole to cooperate with the first positioning rib 34, and the adapter 3 and the crank 1 are interference fit to ensure the installation stability of the adapter 3.

[0053] Reference Figure 1 In order to limit the movement of the adapter 3, a limit nut 6 for limiting the insertion depth of the adapter 3 is sleeved on the middle shaft 02, and the limit nut 6 is arranged at one end of the middle shaft 02 away from the chainring 03.

[0054] Reference Figure 6 In order to enhance the fun, a vibration sensing lamp 7 can be provided inside the pressing member. When the pressing member 421 is pressed, the vibration sensing lamp 7 will emit light to indicate that the crank 1 is being pulled out. At the same time, when the child is riding, the vibration sensing lamp 7 will also emit light due to the vibration of the crank 1 and the bicycle body, thereby enhancing the aesthetics.

[0055] The implementation principle of a crank system for optimal installation in the embodiment of the present application is as follows: when the crank 1 is quickly installed, the positions of the two limit members 41 are first determined, and the installation angle of the crank 1 is adjusted according to the positions of the first positioning rib 34 and the positioning slot 025. After finding the installation position determined by the adapter 3 and the central axis 02, the adapter 3 is inserted into the matching cavity 021 at both ends of the central axis 02, so that the two limit members 41 move radially toward the center position of the core shaft 4212 along the pressing member 421 under the cooperation of the third inclined surface 413 and the fourth inclined surface 024, so that the length of the core shaft 4212 is extended under the cooperation of the first inclined surface 4213 and the second inclined surface 411, thereby squeezing the elastic member 422. As the adapter 3 moves deeper into the mating cavity 021, the limiting member 41 is interfered by the inner wall of the mating cavity 021. When the adapter 3 moves to the set position, the end wall of the crank 1 contacts the limiting nut 6. The limiting member 41 rebounds and snaps into the limiting groove 022 under the restoring force of the elastic member 422. The limiting groove 022 interferes with the limiting member 41 to limit the relative position of the adapter 3 and the central axis 02, thereby completing the quick installation of the crank 1. When the crank 1 is quickly disassembled, the button 4211 is pressed to move the pressing member 421 and the limiting member 41 along the axial direction of the accommodating cavity 32. Under the action of the third inclined surface 413, the limiting member 41 is forced to disengage from the limiting groove 022, thereby eliminating the interference between the limiting member 41 and the limiting groove 022, thereby achieving quick disassembly of the crank 1. The crank 1 is extremely simple to install and maintain, and children over 8 years old can complete the disassembly of the crank 1 assembly.

[0056] Furthermore, by integrating the adapter 3 with the crank 1, when the crank 1 is installed, the adapter 3 is inserted into the matching cavity 021 inside the middle shaft 02. When the child uses the sliding mode for exercise, there are no protrusions at both ends of the middle shaft 02, which will not interfere with the activities of the child's legs, thereby ensuring the safety and comfort of the child during exercise. At the same time, the weight of the middle shaft 02 component is reduced, that is, the weight of the bicycle body is also lighter, and the child can save more effort when using the sliding mode. This installation method can also shorten the distance between the two pedals 2, so that the child can keep his legs closer together when riding, which is more conducive to exerting force. Since the distance between the two pedals 2 can be shortened, the height of the five-way 01 can be further reduced on the basis of meeting the installation specifications of the pedals 2, so that the center of gravity of the bicycle can be lowered, and the child's leg activities can be more stretched in the riding mode, which is more conducive to exerting force.

[0057] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A crank system, comprising a crank (1) and a pedal (2), characterized in that: Also includes: an adapter (3), the adapter (3) being connected to the crank (1) and used for connecting to the middle shaft (02) inside the five-way bracket (01), the middle shaft (02) being provided with matching cavities (021) extending along its axial direction at both ends, and the adapter (3) being capable of being inserted into the matching cavity (021) from one end of the matching cavity (021); A connecting assembly (4) is used to connect to the adapter (3), and the connecting assembly (4) has a locking position and a releasing position. In the locking position, the middle shaft (02) cooperates with the connecting assembly (4) so ​​that the matching cavity (021) and the adapter (3) are locked and connected; in the releasing position, the middle shaft (02) is separated from the connecting assembly (4) so ​​that the crank (1) can be detached from the middle shaft (02) along the axial direction of the adapter (3).

2. The optimized crank system according to claim 1, characterized in that: The connecting assembly (4) comprises a limiting member (41), wherein the limiting member (41) is provided on one of the inner wall of the matching cavity (021) and the outer wall of the adapter (3), and a limiting groove (022) is provided on the other of the two. The limiting member (41) can move radially along the matching cavity (021) to switch between the locking position and the releasing position. In the locking position, the limiting member (41) is at least partially engaged in the limiting groove (022), and in the releasing position, the limiting member (41) is disengaged from the limiting groove (022).

3. The optimized crank system according to claim 2, characterized in that: The limiting member (41) is arranged on the outer wall of the adapter (3), and a through hole (31) for the limiting member (41) to move is opened on the adapter (3), and the limiting groove (022) is arranged on the inner wall of the matching cavity (021).

4. The optimized crank system according to claim 3, characterized in that: The adapter (3) is provided with an accommodating cavity (32) inside, the limiting member (41) is penetrated through the cavity wall of the accommodating cavity (32) along the radial direction of the accommodating cavity (32), the connecting component (4) further comprises a pressing component (42), the pressing component (42) is provided in the accommodating cavity (32) and cooperates with the limiting member (41), and the pressing component (42) can move the limiting member (41) from the locking position to the releasing position.

5. The optimized crank system according to claim 4, characterized in that: The pressing component (42) comprises a pressing member (421) and an elastic member (422), wherein the pressing member (421) cooperates with the limiting member (41), one end of the elastic member (422) abuts against the pressing member (421) and the other end abuts against the end wall of the adapter (3), the pressing member (421) is provided with a first inclined surface (4213), the limiting member (41) is provided with a second inclined surface (411) cooperating with the first inclined surface (4213), the limiting member (41) is provided with a third inclined surface (413) at one end away from the pressing member (421), and the inner wall of the central axis (02) is provided with a fourth inclined surface (024) cooperating with the third inclined surface (413).

6. The optimized crank system according to claim 5, characterized in that: The first inclined surface (4213) is provided with a stop groove (4214) extending along its length direction, the second inclined surface (411) is provided with a stop portion (412), and the stop portion (412) is slidably connected to the stop groove (4214).

7. The optimized crank system according to claim 6, characterized in that: Both the stop groove (4214) and the stop portion (412) are T-shaped; Alternatively, the stop groove (4214) is in a "C" shape, and the stop portion (412) is in an L shape.

8. The optimized crank system according to claim 5, characterized in that: The adapter (3) includes a bushing (33) with a receiving cavity (32) formed therein and a plurality of first positioning ribs (34) fixed to the outer wall of the bushing (33) and extending along the axis direction of the bushing (33). The plurality of first positioning ribs are arranged around the axis of the bushing (33). A plurality of second positioning ribs (5) are circumferentially arranged around the axis of the central shaft (02) on the inner wall of the mating cavity (021). The space between two adjacent second positioning ribs (5) forms a positioning chute (025) that mates with the first positioning ribs. The fourth inclined surface (024) is formed on the end face of the second positioning rib (5), and a fifth inclined surface (341) that mates with the fourth inclined surface (024) is machined on the end face of each first positioning rib (34).

9. The optimized crank system according to claim 8, characterized in that: The through hole (31) is formed between two adjacent first positioning ribs (34), and the distance between two adjacent first positioning ribs (34) on both sides of the through hole (31) is greater than the distance between the remaining adjacent first positioning ribs (34).

10. The optimized crank system according to claim 1, characterized in that: A limit nut (6) for restricting the insertion depth of the adapter (3) is sleeved on the central shaft (02), and the limit nut (6) is arranged at one end of the central shaft (02) away from the chainring (03).

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