Quick-mounting bolt type bicycle axle

Abstract

This utility model discloses a quick-release pin-type bicycle bottom bracket, including a bottom bracket body. A bushing is symmetrically fitted onto the outer wall of the bottom bracket body near its end face. A positioning component is provided between the two bushings and the bottom bracket body to achieve assembly and fixation between the bushings and the bottom bracket body. Bearings are interference-fitted to the outer walls of both bushings, and frame tubes are interference-fitted to the outer walls of the two bearings, allowing the bottom bracket body to rotate stably through the bearings and the inner wall of the frame tube. This utility model pre-interference-fits the bearings to the outer walls of the bushings and then uses the positioning component to quickly position and fix the bushings and bottom bracket body, forming an integrated assembly of bottom bracket body, bushings, and bearings. Subsequent installation only requires assembling this integrated assembly with the frame tube, eliminating the need for separate bearing assembly. This simplifies the assembly process, shortens assembly time, and significantly improves assembly convenience.

Description

Technical Field

[0001] This utility model relates to the field of bicycle component application technology, and in particular to a quick-release pin-type bicycle bottom bracket. Background Technology

[0002] The bottom bracket is one of the core transmission components of a bicycle. One end is connected to the crank, and the other end is connected to the frame tube through a bearing to realize the transmission of power and support of the bicycle. Its assembly stability and ease of assembly directly affect the performance and assembly efficiency of the bicycle.

[0003] When connecting the existing bottom bracket to the frame tube, the bearing needs to be assembled separately onto the outer wall of the bottom bracket first, and then the bottom bracket with the bearing assembled is installed onto the inner wall of the frame tube. This requires two independent assembly operations, which not only increases the complexity of the installation process, but also prolongs the assembly time and reduces the operational efficiency in the production and maintenance process. Therefore, this utility model proposes a quick-install pin-type bicycle bottom bracket. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a quick-install pin-type bicycle bottom bracket to simplify the assembly process, shorten the assembly time, and improve the ease of assembly.

[0005] To solve the above technical problems, the present invention provides a quick-release pin-type bicycle bottom bracket, including a bottom bracket body, wherein bushings are symmetrically sleeved on the outer wall of the bottom bracket body near the end face, and a positioning component is provided between the two bushings and the bottom bracket body to realize the assembly and fixation between the bushings and the bottom bracket body. Both bushings have bearings interference-fitted to their outer walls, and the outer walls of the two bearings are interference-fitted to the frame tubes, so that the axle body can rotate stably through the bearings and the inner wall of the frame tubes.

[0006] The present invention is further configured such that: a stop surface is provided near both ends of the central shaft body, and bolt holes are provided on both end faces.

[0007] The above technical solution allows for the pre-positioning and installation of externally mounted foot pedals using the stop surface, and the foot pedals can be fixed in place using bolts through the bolt holes.

[0008] The present invention is further configured such that: the positioning component includes a pin, and a positioning block is fixedly connected to the end face of the pin; the pin passes through the positioning groove B and positioning groove A opened at corresponding positions of the bushing and the central shaft body in sequence; and the bottom of the pin extends to the disassembly hole opened at the position opposite to the positioning groove B on the outer wall of the bushing.

[0009] Through the above technical solution, the through-type design of the pin can quickly achieve the positioning and assembly of the bushing and the central shaft body. The cooperation between the positioning block and positioning groove A and positioning groove B can limit the relative displacement of the two and ensure the connection stability. The disassembly hole provides operating space for the disassembly of the pin. The pin can be pushed out by inserting a tool into the disassembly hole, so as to quickly separate the bushing and the central shaft body and improve the convenience of maintenance.

[0010] The present invention is further configured such that the positioning blocks are respectively installed inside the positioning groove A and the positioning groove B.

[0011] Through the above technical solution, the shape and size of the positioning block are adapted to the positioning groove A and positioning groove B. After installation, it can fill the gap between them, restrict the relative movement of the bushing and the central shaft body in the circumferential and axial directions, ensure the integrity of the structure after assembly, and avoid component wear or transmission failure caused by relative displacement during transmission.

[0012] The present invention is further configured such that: the inner wall of the frame tube is smoothly fitted to the outer wall of the central axle body, and an installation cavity is provided on the end face of the inner wall; a limiting plate is provided on the end face of the bushing, and both the limiting plate and the bearing are located inside the installation cavity.

[0013] Through the above technical solution, the smooth fit design between the inner wall of the frame tube and the outer wall of the bottom bracket body can reduce the frictional resistance between the two and improve the smoothness of the bottom bracket rotation; the mounting cavity provides a space for the limiting plate and bearing, and the limiting plate can play an axial limiting role for the bearing, preventing the bearing from axially moving during rotation and ensuring the stability of the fit between the bearing and the frame tube and bushing.

[0014] The present invention is further configured such that: a connecting part is fixedly connected to the end face of the frame tube, and an end cap is threadedly connected to the outer wall of the connecting part, and the inner wall of the end cap is attached to the outer wall of the bushing.

[0015] Through the above technical solution, the threaded connection between the connecting part and the end cover facilitates the quick assembly and disassembly of the end cover. The fit design between the inner wall of the end cover and the outer wall of the bushing can play an auxiliary positioning role for the bushing, further restricting the axial displacement of the bushing. At the same time, it can prevent external dust and impurities from entering the installation cavity, thus protecting the bearings and other components and extending the service life of the components.

[0016] The present invention is further configured such that: the end cap and the end of the frame tube connection extend into the interior of the mounting cavity and abut against the inner ring sidewall of the bearing.

[0017] Through the above technical solution, the design of the end cover pressing against the inner ring sidewall of the bearing can further enhance the axial positioning effect of the bearing, ensure the stability of the interference fit between the inner ring of the bearing and the bushing, and between the outer ring and the frame tube, avoid the bearing from loosening or displacement during high-speed rotation, and improve the overall transmission stability and structural reliability of the central shaft.

[0018] The beneficial effects of this utility model are as follows: 1. The quick-install pin-type bicycle bottom bracket proposed in this utility model pre-interference-connects the bearing to the outer wall of the bushing, and then uses a positioning component to quickly position and fix the bushing and the bottom bracket body, forming an integrated component of bottom bracket body-bushing-bearing. Subsequently, only the integrated component needs to be assembled with the frame tube to complete the installation, without the need for separate bearing assembly, which simplifies the assembly process, shortens the assembly time, and greatly improves the ease of assembly. 2. The quick-release pin-type bicycle bottom bracket proposed in this utility model adopts a pin and positioning block cooperation structure, which not only realizes the quick positioning and fixing of the bushing and the bottom bracket body, but also realizes the quick separation of the two through the disassembly hole, which facilitates later maintenance and component replacement and reduces maintenance costs. 3. The quick-release pin-type bicycle bottom bracket proposed in this utility model forms a multi-axial limiting structure through the cooperation design of the mounting cavity of the frame tube, the end cap and the bushing limiting plate, which effectively avoids the axial movement of the bearing and bushing. At the same time, the end cap can play a dustproof protection role, extend the service life of the components, and improve the overall structural stability and reliability of the bottom bracket. Attached Figure Description

[0019] Figure 1 This is a structural diagram of a quick-release pin-type bicycle bottom bracket according to this utility model; Figure 2 This is a cross-sectional view of a quick-release pin-type bicycle bottom bracket according to the present invention. Figure 3 This is a structural diagram of the internal structure of a quick-release pin-type bicycle bottom bracket according to this utility model; Figure 4 This is an exploded view of the interior of the quick-release pin-type bicycle bottom bracket according to this utility model.

[0020] In the figure: 1. Bottom shaft body; 11. Stop surface; 12. Bolt hole; 13. Positioning groove A; 2. Bushing; 21. Positioning groove B; 22. Disassembly hole; 3. Bearing; 4. Positioning assembly; 41. Pin; 42. Positioning block; 5. Frame through pipe; 51. Mounting cavity; 52. Connecting part; 53. End cover. Detailed Implementation

[0021] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the scope of protection of the present invention.

[0022] like Figure 1 and Figure 4 As shown, a quick-release pin-type bicycle bottom bracket includes a bottom bracket body 1. The bottom bracket body 1 has stop surfaces 11 near both ends, and bolt holes 12 are provided on the end faces. The stop surfaces 11 can be used to pre-position and install externally installed pedals, and the bolt holes 12 can be used to install and fix the pedals with bolts.

[0023] like Figure 3 and Figure 4 As shown, bushings 2 are symmetrically fitted onto the outer wall of the central shaft body 1 near the end face, and a positioning component 4 is provided between the two bushings 2 and the central shaft body 1 to achieve assembly and fixation between the bushings 2 and the central shaft body 1. The positioning component 4 includes a pin 41, and a positioning block 42 is fixedly connected to the end face of the pin 41. The pin 41 passes through the positioning grooves B21 and A13 opened at corresponding positions on the bushings 2 and the central shaft body 1 in sequence, and the bottom of the pin 41 extends to the disassembly hole 22 opened on the outer wall of the bushing 2 opposite to the positioning groove B21. With the through-type design of the pin 41, the bushings 2 and the central shaft body 1 can be quickly positioned and assembled. The cooperation of the positioning block 42 with the positioning grooves A13 and B21 can limit the relative displacement of the two and ensure the connection stability. The disassembly hole 22 provides operating space for the disassembly of the pin 41. The pin 41 can be pushed out by inserting a tool into the disassembly hole 22 to achieve quick separation of the bushings 2 and the central shaft body 1, improving the convenience of maintenance. The positioning blocks 42 are installed inside the positioning grooves A13 and B21 respectively. The shape and size of the positioning blocks 42 are adapted to the positioning grooves A13 and B21. After installation, they can fill the gap between them, restrict the relative movement of the bushing 2 and the central shaft body 1 in the circumferential and axial directions, ensure the integrity of the structure after assembly, and avoid component wear or transmission failure caused by relative displacement during transmission.

[0024] like Figures 2-4As shown, the outer walls of both bushings 2 are interference-fitted with bearings 3, and the outer walls of the two bearings 3 are interference-fitted with frame tubes 5, so that the axle body 1 can rotate stably through the bearings 3 and the inner wall of the frame tubes 5. The inner wall of the frame tubes 5 and the outer wall of the axle body 1 are smoothly fitted together, and an installation cavity 51 is opened at the end face of the inner wall. A limiting plate is provided at the end face of the bushing 2, and the limiting plate and the bearings 3 are both located inside the installation cavity 51. The smooth fit design between the inner wall of the frame tubes 5 and the outer wall of the axle body 1 can reduce the frictional resistance between the two and improve the smoothness of the axle rotation. The installation cavity 51 provides a space for the limiting plate and the bearings 3. The limiting plate can axially limit the bearings 3, prevent the bearings 3 from axially moving during rotation, and ensure the stability of the fit between the bearings 3 and the frame tubes 5 and bushings 2. The end face of the frame tube 5 is fixedly connected to a connecting part 52, and the outer wall of the connecting part 52 is threadedly connected to an end cap 53. The inner wall of the end cap 53 is attached to the outer wall of the bushing 2. The threaded connection between the connecting part 52 and the end cap 53 facilitates the quick installation and removal of the end cap 53. The fitting design between the inner wall of the end cap 53 and the outer wall of the bushing 2 can play an auxiliary positioning role for the bushing 2, further restricting the axial displacement of the bushing 2. At the same time, it can prevent external dust and impurities from entering the installation cavity 51, protect the bearing 3 and other components, and extend the service life of the components. The end cap 53 extends into the interior of the mounting cavity 51 and abuts against the inner ring sidewall of the bearing 3. The design of the end cap 53 abutting against the inner ring sidewall of the bearing 3 can further enhance the axial positioning effect of the bearing 3, ensure the stability of the interference fit between the inner ring of the bearing 3 and the bushing 2, and between the outer ring and the frame tube 5, avoid the bearing 3 from loosening or displacement during high-speed rotation, and improve the overall transmission stability and structural reliability of the central shaft.

[0025] In use, the bearing 3 is first pre-interfered onto the outer wall of the bushing 2, and then the bushing 2 is fitted onto the corresponding position of the central shaft body 1, aligning the positioning groove A13 with the positioning groove B21. The pin 41 is then inserted through the positioning groove B21 and the positioning groove A13 in sequence, so that the positioning block 42 is embedded in the corresponding positioning groove, thus fixing the bushing 2 to the central shaft body 1. Subsequently, the integrated central shaft assembly is inserted into the mounting cavity 51 of the frame tube 5, so that the bearing 3 is interference-fitted with the inner wall of the mounting cavity 51. Finally, the end cap 53 is threaded onto the connecting part 52, and the end cap 53 is pressed against the inner ring side wall of the bearing 3, completing the overall assembly. For disassembly, simply unscrew the end cap 53 and push out the pin 41 through the disassembly hole 22 to separate the components.

[0026] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A quick release pin type bicycle axle spindle comprising an axle spindle body (1), characterized in that: The outer wall of the central shaft body (1) is symmetrically fitted with bushings (2) near the end face, and a positioning component (4) is provided between the two bushings (2) and the central shaft body (1) to realize the assembly and fixation between the bushings (2) and the central shaft body (1); The outer walls of the two bushings (2) are both interference-fitted with bearings (3), and the outer walls of the two bearings (3) are interference-fitted with frame tubes (5) so that the central axle body (1) can rotate stably through the bearings (3) and the inner wall of the frame tubes (5).

2. A quick release axle for a bicycle according to claim 1, wherein: The central shaft body (1) has stop surfaces (11) near both ends, and bolt holes (12) are provided on both end faces.

3. The quick-release pin-type bicycle bottom bracket according to claim 1, characterized in that: The positioning component (4) includes a pin (41), and a positioning block (42) is fixedly connected to the end face of the pin (41). The pin (41) passes through the positioning groove B (21) and positioning groove A (13) opened at corresponding positions of the bushing (2) and the central shaft body (1) in sequence, and the bottom of the pin (41) extends to the disassembly hole (22) opened on the outer wall of the bushing (2) opposite to the positioning groove B (21).

4. A quick-release pin-type bicycle bottom bracket according to claim 3, characterized in that: The positioning blocks (42) are respectively installed inside the positioning slots A (13) and B (21).

5. A quick release axle for a bicycle according to claim 1, wherein: The inner wall of the frame tube (5) is smoothly fitted to the outer wall of the central axle body (1), and the inner wall has an installation cavity (51) at the end face. The end face of the bushing (2) is provided with a limiting plate, and the limiting plate and the bearing (3) are both located inside the installation cavity (51).

6. A quick release axle for a bicycle according to claim 5, wherein: The end face of the frame tube (5) is fixedly connected to a connecting part (52), and the outer wall of the connecting part (52) is threadedly connected to an end cap (53), and the inner wall of the end cap (53) is attached to the outer wall of the bushing (2).

7. A quick release axle for a bicycle according to claim 6, wherein: The end cap (53) and the frame tube (5) are connected to the interior of the mounting cavity (51) and abut against the inner ring sidewall of the bearing (3).

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