Crank quick release structure and bicycle

Abstract

The utility model relates to a crank quick-release structure and a bicycle, and belongs to the technical field of bicycles, the crank quick-release structure comprises a middle shaft and cranks arranged at the two ends of the middle shaft, one end of a handle body of each crank is provided with a mounting groove, and the side wall of each mounting groove is provided with a handle clamping hole; mounting bodies are arranged at the two ends of a shaft body of the middle shaft respectively, and mounting clamping holes are formed in the side walls of the mounting bodies. An accommodating space is formed in the mounting body, a locking assembly is arranged in the accommodating space, and the locking assembly comprises a locking ball; the installation body of the middle shaft can be inserted into the installation groove of the crank, and the locking ball of the locking assembly can penetrate through or retreat from the installation clamping hole and the handle clamping hole so that the middle shaft and the crank can be fixedly connected or separated. Through the movement of the locking bead, the quick fixed connection and separation of the middle shaft and the crank are realized, the assembling and disassembling efficiency of the bicycle is improved, and meanwhile, the user experience is also enhanced.

Description

Technical Field

[0001] This application relates to the field of bicycles, and more particularly to a crank quick-release mechanism and a bicycle. Background Technology

[0002] As a popular mode of personal transportation, bicycles have continuously evolved in design and function to adapt to different riding needs. However, the crank mechanism of traditional bicycles, while robust and durable, is cumbersome and complex to install and remove, often requiring professionals with specific tools. This not only increases inconvenience for users but also limits the portability and storage flexibility of bicycles in modern life.

[0003] The installation and removal of traditional cranks require a high level of professional skill, which often means that ordinary cyclists must rely on professional repair services, adding extra time and costs. Furthermore, since the cranks and pedals constitute the main part of a bicycle's width, especially when the pedals are extended, the overall size of the bicycle increases significantly, making it difficult to store or transport in confined spaces. This poses a particular challenge for urban residents with limited living space.

[0004] With the rapid pace of urbanization and changing lifestyles, people are demanding greater portability and efficiency from their transportation options. In densely populated urban environments with limited living space and well-developed public transportation, the portability and ease of storage of bicycles become particularly important. Therefore, the market urgently needs an innovative crank design that maintains the basic performance of a bicycle while allowing for convenient and quick assembly and disassembly to suit the fast-paced lifestyle of modern cities.

[0005] Based on a deep understanding of the limitations of existing technologies and market demands, this invention aims to develop a novel quick-release structure for bicycle cranks. This structure aims to significantly improve the portability and storage efficiency of bicycles by simplifying the installation and removal process of the cranks and reducing the bicycle's footprint when not in use. The goal of this innovative design is to provide cyclists with a more flexible, efficient, and convenient riding experience, meeting the higher standards of urban life for transportation. Utility Model Content

[0006] In order to overcome the shortcomings of the existing technology, such as the complex and time-consuming connection between the crank and the bottom bracket and the need for special tools for maintenance or replacement, this application provides a crank quick-release structure and a bicycle.

[0007] Firstly, this application provides a crank quick-release structure, which adopts the following technical solution:

[0008] A crank quick-release mechanism includes a bottom bracket and cranks disposed at both ends of the bottom bracket.

[0009] The crank includes a crank body, a mounting groove is provided at one end of the crank body, and a crank locking hole is provided on the side wall of the mounting groove.

[0010] The central shaft includes a shaft body, and mounting bodies are respectively provided at both ends of the shaft body. Mounting slot holes are provided on the side walls of the mounting bodies. The mounting bodies have an internal accommodating space, and a locking assembly is provided in the accommodating space. The locking assembly includes locking beads.

[0011] The mounting body of the central shaft can be inserted into the mounting slot of the crank, and,

[0012] The locking ball of the locking assembly can move sequentially through the mounting hole and the crank arm mounting hole to fix the central shaft to the crank arm; or,

[0013] The locking ball of the locking assembly can be moved out of the mounting hole and the handle mounting hole in sequence to separate the central shaft from the crank.

[0014] By adopting the above technical solution, an efficient and stable solution for installing and removing bicycle cranks is provided. This quick-release crank mechanism enables rapid installation and removal. The locking ball, as the core component of the locking assembly, easily passes through the mounting and crank locking holes, quickly connecting or separating the bottom bracket from the crank. This greatly simplifies the process of bicycle maintenance or crank replacement, saving time and effort. When the locking ball passes through the mounting and crank locking holes, it forms a mechanical locking mechanism, ensuring a secure connection between the bottom bracket and the crank, preventing loosening or detachment during riding, and improving riding safety and comfort. This structure allows users to adjust the crank position or replace different cranks without tools, which is very convenient for cyclists who need frequent fine-tuning or use multiple types of cranks. Compared to traditional fixing methods, such as screws or special tools, this quick-release structure reduces the need for additional parts, lowers manufacturing and maintenance costs, and also reduces the burden of carrying tools. This quick-release structure design has a certain degree of versatility and can be applied to bicycles of different brands and models, as long as their bottom bracket and crank sizes are compatible, enabling rapid installation and removal. Therefore, the crank quick-release mechanism, through its innovative locking mechanism, not only improves the convenience of replacing bicycle parts, but also enhances the stability and safety of the connection points, bringing a better riding experience to the rider.

[0015] Optionally, the locking assembly further includes a pressing part and a spring, the pressing part and the spring being disposed within the accommodating space, and the pressing part and the spring being arranged along the axial direction of the central axis.

[0016] One end of the spring abuts against the inner wall of the accommodating space, and the other end abuts against one end of the pressing part, the other end of the pressing part extending to the outer side of the accommodating space.

[0017] The locking bead is installed at the pressing part.

[0018] By employing the above technical solution, the pressing part and spring configuration allow the locking ball to move within and outside the accommodating space. Pressing the pressing part compresses the spring, controlling the retraction of the locking ball, facilitating the assembly or disassembly of the bottom bracket and crank. When the pressing part is released, the spring's restoring force causes the locking ball to extend, achieving a secure connection between the bottom bracket and crank, thus ensuring connection stability and ease of operation. This design greatly simplifies the crank assembly and disassembly process, improving bicycle maintenance efficiency.

[0019] Optionally, a sliding groove is provided on one side of the pressing part. The sliding groove is an inclined groove that is shallower on the side closer to the spring and deeper on the side farther from the spring. The locking bead is disposed in the sliding groove and can move along the sliding groove.

[0020] By adopting the above technical solution, the locking ball in the crank quick-release structure can move smoothly within the inclined sliding groove. This design allows the locking ball to retract more smoothly when the pressing part is under force, and to reliably pop out when the pressing part is released, achieving quick locking and unlocking between the bottom bracket and the crank. The inclined groove design ensures that the movement trajectory of the locking ball is preset, improving the stability and response speed of the entire locking system, thereby simplifying the operation process of the quick-release structure and enhancing the user experience.

[0021] Optionally, the shaft body of the central axis is provided with a limiting body near the mounting body.

[0022] By adopting the above technical solution, the quick-release crank mechanism adds a limiting body to the bottom bracket shaft body. This design effectively prevents the bottom bracket from being over-inserted during installation or from unnecessary movement due to vibration during use, ensuring correct alignment and a stable connection between the bottom bracket and the crank. The presence of the limiting body not only improves the overall stability and reliability of the structure but also simplifies the installation process, avoids damage that may be caused by excessive operation, and enhances the user experience.

[0023] Optionally, the shaft body is provided with a threaded section on the side of the limiting body opposite to the mounting body.

[0024] By adopting the above technical solution, the quick-release crank mechanism adds a threaded section to the bottom bracket shaft body. This design allows the bottom bracket to be fixed to other bicycle components (such as bushings) via a threaded connection, ensuring stable positioning of the bottom bracket on the bicycle and preventing loosening due to vibration or force during riding. This design not only enhances the reliability and safety of the overall structure but also provides greater flexibility and convenience for assembly and maintenance.

[0025] Optionally, a guide groove is provided in the mounting groove of the crank; the guide groove is adapted to the shape of the mounting body.

[0026] By adopting the above technical solution, the crank quick-release structure incorporates a guide groove within the crank mounting slot. This guide groove is designed to match the shape of the bottom bracket mounting body, ensuring that the bottom bracket smoothly enters along the correct path when the crank is inserted, preventing misalignment or displacement during installation. The use of the guide groove not only simplifies the installation process and improves efficiency but also guarantees precise alignment between the bottom bracket and the crank, enhancing the stability and safety of the connection and further improving the reliability and user experience of the entire quick-release structure.

[0027] Optionally, the crank body has a shaft hole on the side away from the mounting groove.

[0028] By adopting the above technical solution, the crank quick-release structure has a shaft hole on the side of the crank body away from the mounting slot. This allows other components, such as crank arms or pedal shafts, to be connected to the crank body through the shaft hole. The presence of the shaft hole provides the necessary interface, enabling the crank to be tightly integrated with other components of the bicycle to form a complete drivetrain.

[0029] Optionally, the crank body is provided with a crank wall groove.

[0030] By adopting the above technical solution, the crank quick-release structure provides a groove in the crank body. This not only reduces the weight of the crank and improves its strength-to-rigidity ratio, but also provides space for installing decorations or other accessories, increasing the crank's aesthetics and functionality.

[0031] Optionally, when the central shaft is fixedly connected to the crank, a protective cover may be provided on the outside of the pressing part.

[0032] By adopting the above technical solution, a protective cover is installed on the outside of the pressing part when the bottom bracket and crank are fixedly connected. This effectively prevents external impurities such as dust and mud from entering the locking assembly, keeping the locking mechanism clean and lubricated, and extending its service life. At the same time, the protective cover also provides some impact protection, reducing the possibility of the pressing part being accidentally impacted during riding or transport, further ensuring the stability and safety of the crank quick-release structure. This design reflects attention to detail and improves the overall durability and user experience of the product.

[0033] Secondly, this application provides a bicycle including the aforementioned crank quick-release structure.

[0034] By adopting the above technical solution, the crank quick-release structure of this application provides a quick and stable connection between the crank and the bottom bracket, while ensuring the convenience of disassembly and improving the efficiency of bicycle maintenance and use.

[0035] This application includes at least one of the following beneficial technical effects:

[0036] This application enables efficient and convenient installation and disassembly. Through the design of locking ball, pressing part and spring, it realizes quick connection and separation between bottom bracket and crank without the need for any tools, which greatly shortens the time required for bicycle maintenance or crank replacement and improves the convenience of operation.

[0037] This application enables tool-free quick connection and separation between the bottom bracket and the crank, greatly improving bicycle maintenance efficiency and user experience. Through the coordinated work of the locking ball, pressing part and spring, a stable mechanical lock is ensured, enhancing riding safety, while simplifying the process of crank adjustment or replacement, adapting to diverse riding needs. Attached Figure Description

[0038] Figure 1 This is a three-dimensional structural schematic diagram of one embodiment of the crank quick-release structure of this application.

[0039] Figure 2 This is a three-dimensional structural schematic diagram of an embodiment of the crank of this application.

[0040] Figure 3 This is a three-dimensional structural schematic diagram of another embodiment of the crank of this application.

[0041] Figure 4 This is a three-dimensional structural schematic diagram of one embodiment of the central axis in this application.

[0042] Figure 5 This is a partial structural diagram of the locking mechanism of this application.

[0043] Figure 6 yes Figure 5Schematic diagram of the AA section structure.

[0044] Figure 7 This is a front view schematic diagram of one embodiment of the crank quick-release structure of this application.

[0045] Figure 8 yes Figure 7 Schematic diagram of the cross-sectional structure of the middle BB.

[0046] Explanation of reference numerals in the attached figures:

[0047] 1. Crank; 11. Crank body; 12. Mounting groove; 13. Crank locking hole; 14. Shaft hole; 15. Crank wall groove; 16. Guide groove;

[0048] 2. Central shaft; 21. Shaft body; 22. Threaded section; 23. Limiting body; 24. Mounting body; 25. Mounting locking hole; 26. Pressing part; 27. Spring; 28. Sliding groove; 29. ​​Locking ball. Detailed Implementation

[0049] The following is combined with Figure 1-8 This application is described in further detail.

[0050] This application discloses a quick-release structure for a crank 1.

[0051] refer to Figure 1 This embodiment provides a quick-release structure for crank 1, including a central shaft 2 and cranks 1 disposed at both ends of the central shaft 2.

[0052] refer to Figure 4-6 The central shaft 2 has a shaft body 21, and each end of the shaft body 21 is equipped with a mounting body 24. The mounting body 24 has a mounting slot hole 25 on its side wall, and the interior of the mounting body 24 has an accommodating space. A locking component is installed in this accommodating space, and the locking component contains a locking ball 29.

[0053] refer to Figure 2-3 The crank 1 is composed of a handle body 11, one end of which has a mounting groove 12, and the side wall of the mounting groove 12 has a handle locking hole 13.

[0054] refer to Figure 7-8 In practical applications, the mounting body 24 of the bottom bracket 2 can be inserted into the mounting slot 12 of the crank 1, while the locking ball 29 in the locking assembly can flexibly pass through the mounting hole 25 and the crank arm locking hole 13 to fix the bottom bracket 2 and the crank 1. Conversely, the locking ball 29 can also flexibly exit the mounting hole 25 and the crank arm locking hole 13, thereby separating the bottom bracket 2 and the crank 1.

[0055] Through the special structural design of the bottom bracket 2 and crank 1, combined with the quick locking and releasing function of the locking assembly, convenient connection and separation between crank 1 and bottom bracket 2 are achieved. This design not only simplifies the operation steps, but also greatly improves the efficiency of assembly and disassembly.

[0056] In some embodiments of this application, the locking assembly includes a pressing part 26 and a spring 27 in addition to the locking ball 29. Both the pressing part 26 and the spring 27 are disposed within the receiving space of the mounting body 24, arranged along the axial direction of the central axis 2. One end of the spring 27 abuts against the inner wall of the receiving space, and the other end abuts against one end of the pressing part 26. The other end of the pressing part 26 extends to the outer side of the receiving space and is fitted with the locking ball 29. Specifically, an inclined sliding groove 28 is formed on one side of the pressing part 26. This sliding groove 28 is shallower on the side closer to the spring 27 and deeper on the side farther from the spring 27. The locking ball 29 is installed within the sliding groove 28 and is able to move freely along the sliding groove 28.

[0057] In actual operation, pressing the pressing part 26 controls the locking ball 29 to move in and out of the mounting hole 25 and the handle locking hole 13, thereby connecting or separating the central shaft 2 from the crank 1. When the user presses the pressing part 26, the locking ball 29 moves along the sliding groove 28, thus moving in and out of the mounting hole 25 and the handle locking hole 13 more smoothly.

[0058] It should be noted that during production and assembly, the pressing part 26 and the spring 27 are installed within the accommodating space of the mounting body 24. The mounting body 24 is installed in the mounting hole at the end of the shaft body 21 with an interference fit under high temperature conditions, and cannot be disassembled during actual use. Furthermore, a limiting boss or other limiting structure can be provided on the side of the pressing part 26 away from the spring to ensure that the pressing part 26 can pass through and move into the through hole extending outward from the accommodating space, but the pressing part 26 will not fall out.

[0059] In some embodiments of this application, the crank 1 has a guide groove 16 inside the mounting groove 12, which is adapted to the shape of the mounting body 24 to ensure that the mounting body 24 can be accurately inserted into the mounting groove 12.

[0060] In some embodiments of this application, the axle body 21 of the bottom bracket 2 is provided with a limiting body 23 near the mounting body 24 to limit the position of the bottom bracket 2 when it is installed on the bicycle, thereby improving the structural stability of the bottom bracket 2 after installation. The axle body 21 is provided with a threaded section 22 on the side of the limiting body 23 facing away from the mounting body 24, so that the bottom bracket 2 can be fixed to other parts of the bicycle (such as axle sleeves) by means of threaded connection.

[0061] In addition, the crank body 11 of the crank 1 is provided with a shaft hole 14 on the side away from the mounting groove 12 for connection with other components. The crank body 11 is also provided with a crank wall groove 15 to reduce weight and improve structural strength.

[0062] This embodiment also discloses a bicycle that includes the quick-release crank 1 structure described in the above embodiments. This special quick-release crank 1 structure allows users to quickly assemble and disassemble the bicycle without using any tools, greatly improving ease of use and flexibility.

[0063] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A quick-release structure for a crank (1), characterized in that, Includes a central shaft (2) and cranks (1) set at both ends of the central shaft (2). The crank (1) includes a crank body (11), a mounting groove (12) is provided at one end of the crank body (11), and a crank locking hole (13) is provided on the side wall of the mounting groove (12). The central shaft (2) includes a shaft body (21), and mounting bodies (24) are respectively provided at both ends of the shaft body (21). Mounting slot holes (25) are provided on the side wall of the mounting body (24). The mounting body (24) has an internal accommodating space, and a locking component is provided in the accommodating space. The locking assembly includes a locking bead (29), a pressing part (26), and a spring (27). The pressing part (26) and the spring (27) are disposed within the accommodating space and are arranged along the axial direction of the central axis (2). One end of the spring (27) abuts against the inner wall of the accommodating space, and the other end abuts against one end of the pressing part (26), the other end of the pressing part (26) extending to the outside of the accommodating space. The locking bead (29) is installed at the pressing part (26); A sliding groove (28) is provided on one side of the pressing part (26). The sliding groove (28) is an inclined groove that is shallow on the side close to the spring (27) and deep on the side away from the spring (27). The locking bead (29) is disposed in the sliding groove (28) and can move along the sliding groove (28). The mounting body (24) of the central shaft (2) can be inserted into the mounting slot (12) of the crank (1), and, The locking ball (29) of the locking assembly can move sequentially through the mounting hole (25) and the handle hole (13) to fix the central shaft (2) and the crank (1) in a fixed connection; or, The locking ball (29) of the locking assembly can be moved out of the mounting hole (25) and the handle hole (13) in sequence to separate the central shaft (2) from the crank (1); The shaft body (21) of the central shaft (2) is provided with a limiting body (23) near the mounting body (24); The shaft body (21) has a threaded section (22) on the side of the limiting body (23) away from the mounting body (24). A guide groove (16) is provided in the mounting groove (12) of the crank (1); the guide groove (16) is adapted to the shape of the mounting body (24); The crank (1) has a handle wall groove (15) on its handle body (11). When the central shaft (2) is fixedly connected to the crank (1), a protective cover may be provided on the outside of the pressing part (26).

2. The quick-release structure of the crank (1) according to claim 1, characterized in that, The crank (1) has a shaft hole (14) on the side of the crank body (11) away from the mounting groove (12).

3. A bicycle characterized in that, Includes the crank (1) quick-release structure as described in any one of claims 1-2.

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