A bicycle hub and a bicycle

Abstract

A bicycle hub, comprising a middle shaft, a hub shell and a tower base, the hub shell and the tower base are rotatably arranged on the middle shaft, characterized in that further comprising a shell ratchet, a tower base ratchet and an elastic element, the shell ratchet and the tower base ratchet are both circular ring structures, the shell ratchet is movably arranged in the hub shell along the axial direction, the tower base ratchet is movably arranged in the tower base along the axial direction, and the elastic element drives the tower base ratchet to move towards the shell ratchet, in the above scheme, the shell ratchet and the hub shell are not fixedly connected, but movably connected along the axial direction, and under the action of the elastic element, the shell ratchet can be basically fixed relative to the hub shell, so that when the shell ratchet rotates, it can drive the hub shell to rotate, compared with the existing fixed connection mode, the movable arrangement of the shell ratchet can facilitate the disassembly and installation of the shell ratchet, thereby facilitating the maintenance of the product.

Description

Technical Field

[0001] This utility model relates to a bicycle hub and a bicycle. Background Technology

[0002] The bicycle hub serves to connect the chain and axle, making it a crucial component of a bicycle. As is generally known, existing bicycle hubs include a bottom bracket, hub housing, freehub body, ratchet assembly, and a spring mechanism. The hub housing is rotatably mounted on the bottom bracket via bearings, as is the freehub body. The ratchet assembly is located between the hub housing and the freehub body. The ratchet assembly includes a housing ratchet mounted on the hub housing and a freehub body ratchet mounted on the freehub body that meshes with the housing ratchet. The housing ratchet is threadedly fixed to the hub housing via external threads, while the freehub body ratchet is axially movable within the freehub body. The spring mechanism drives the housing ratchet and the freehub body ratchet to engage. The housing ratchet has multiple circumferentially arranged first ratchet teeth, and the freehub body ratchet has multiple circumferentially arranged second ratchet teeth. The engagement of the first and second ratchet teeth allows the freehub body to rotate unidirectionally relative to the hub housing or to drive the hub housing to rotate.

[0003] In the above solution, the ratchet of the housing is fixedly connected to the hub housing by threads, which is difficult to disassemble during maintenance, affecting product maintenance and bearing replacement. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by providing a bicycle hub that is easy to disassemble and repair.

[0005] Another objective of this invention is to provide a bicycle using this bicycle hub.

[0006] The objective of this utility model is achieved through the following technical solution:

[0007] A bicycle hub includes a bottom bracket, a hub housing, and a freehub base. The hub housing and freehub base are rotatably mounted on the bottom bracket. The hub is characterized by further including a housing ratchet, a freehub base ratchet, and an elastic element. Both the housing ratchet and the freehub base ratchet are annular structures. The housing ratchet is rotatably mounted in the hub housing only along its axial direction, and the freehub base ratchet is rotatably mounted in the freehub base only along its axial direction. The housing ratchet has a plurality of circumferentially arranged first ratchet teeth, and the freehub base ratchet has a plurality of circumferentially arranged second ratchet teeth. The first and second ratchet teeth are unidirectionally rotatable and mesh. The elastic element drives the freehub base ratchet to move towards the housing ratchet, thus maintaining the meshing of the first and second ratchet teeth.

[0008] In the above solution, the ratchet of the housing and the hub housing are not fixedly connected. Instead, the ratchet of the housing is movable and can only move along its axial direction. Under the action of the elastic element, the ratchet of the housing can be basically fixed relative to the hub housing. In this way, when the ratchet of the housing rotates, it can drive the hub housing to rotate. Compared with the existing fixed connection method, the movable setting of the ratchet of the housing can facilitate the disassembly and installation of the ratchet of the housing, thereby facilitating the maintenance of the product.

[0009] An elastic buffer washer is provided between the hub housing and the end of the housing ratchet facing away from the first ratchet tooth. During operation, the base ratchet will bounce back and forth. The elastic buffer washer can prevent the housing ratchet from colliding with the hub housing during this process, thereby reducing noise and improving the product's service life.

[0010] The elastic buffer gasket is made of silicone or rubber, and silicone and rubber have oil resistance and temperature resistance.

[0011] The inner wall of the ratchet housing has a first stepped portion that supports the elastic buffer washer. This structure facilitates product assembly and reliable positioning of the elastic buffer washer.

[0012] The outer peripheral surface of the ratchet of the housing is formed with a first external spline, the inner peripheral surface of the hub housing is formed with a first internal spline that mates with the first external spline, the outer peripheral surface of the freehub ratchet is formed with a second external spline, and the inner peripheral surface of the freehub base is formed with a second internal spline that mates with the second external spline. Compared with the existing threaded connection structure, the spline connection can improve the load-bearing capacity, facilitate the disassembly and assembly of the hub ratchet, and solve the problem of difficult disassembly and assembly of the right bearing of the hub housing.

[0013] The multiple first ratchet teeth arranged in a circle form a concave first conical meshing surface, and the multiple second ratchet teeth arranged in a circle form a convex second conical meshing surface that matches the first conical meshing surface. Compared with the existing flat meshing surface, the conical meshing surface can increase the meshing area, maximize the use of material, and has the function of aligning the center, thereby ensuring that the first ratchet teeth and the second ratchet teeth mesh stably and reliably.

[0014] The hub housing is rotatably mounted on the central shaft via a first left-side bearing and a first right-side bearing. The freehub base is rotatably mounted on the central shaft via a second left-side bearing and a second right-side bearing. A spacer is fitted on the central shaft between the inner ring of the first right-side bearing and the inner ring of the second left-side bearing. The right end of the spacer has an outwardly protruding annular limiting portion. An anti-disengagement ring is fitted on the spacer, the inner diameter of which is smaller than the outer diameter of the annular limiting portion. The elastic element is compressed at the end of the freehub base ratchet facing away from the second ratchet tooth and is connected to the anti-disengagement ring. The spring between the retaining rings, with the anti-detachment retaining ring's opposite end abutting against the outer ring of the second left bearing, separates the anti-detachment retaining ring from the spacer. This anti-detachment retaining ring prevents the spring and the tower base ratchet from flying off or falling off during disassembly and assembly. The anti-detachment retaining ring's opposite end abutting against the outer ring of the second left bearing separates the anti-detachment retaining ring from the spacer. This structure fixes the anti-detachment retaining ring relative to the tower base, thereby preventing friction damage between the spring and the anti-detachment retaining ring during operation, as well as preventing friction damage between the anti-detachment retaining ring and the spacer.

[0015] The annular limiting part has a first conical surface that contacts the anti-detachment ring, and the anti-detachment ring has a second conical surface that matches the first conical surface. This structure allows the anti-detachment ring and the spacer to be aligned with the center, thereby preventing the anti-detachment ring from deviating from the center.

[0016] The tower base is rotatably mounted on the central shaft via a second left bearing and a second right bearing, and the elastic element is a spring compressed between the end of the ratchet of the tower base facing away from the second ratchet tooth and the outer ring of the second right bearing.

[0017] A bicycle, characterized in that it includes the aforementioned bicycle hub. Attached Figure Description

[0018] The present invention will now be described in further detail with reference to the accompanying drawings.

[0019] Figure 1 This is a perspective view of Example 1.

[0020] Figure 2 This is a front view of Example 1.

[0021] Figure 3 for Figure 2 A sectional view along the AA direction.

[0022] Figure 4 for Figure 3 Enlarged view of part B.

[0023] Figure 5 This is an exploded view of the components in Example 1.

[0024] Figure 6 This is an exploded view of the components from another perspective of Embodiment 1.

[0025] Figure 7 This is an exploded view of the components of the housing ratchet and the base ratchet in Embodiment 1.

[0026] Figure 8 This is an exploded view of the housing ratchet and the base ratchet from another perspective in Embodiment 1.

[0027] Figure 9 This is a cross-sectional view of Example 2.

[0028] Figure 10 for Figure 9 Enlarged view of part C. Detailed Implementation

[0029] Example 1, refer to Figures 1 to 8 As shown, a bicycle hub includes a bottom bracket 1, a hub housing 2, a freehub base 3, a housing ratchet 5, a freehub base ratchet 6, and an elastic element 64. The hub housing 2 is rotatably mounted on the bottom bracket 1 via a first left bearing 41 and a first right bearing 42. The freehub base 3 is rotatably mounted on the bottom bracket 1 via a second left bearing 43 and a second right bearing 44. Both the housing ratchet 5 and the freehub base ratchet 6 are annular structures. The housing ratchet 5 is movably mounted in the hub housing 2 only along its axial direction, and the freehub base ratchet 6 is movably mounted in the freehub base 3 only along its axial direction. The housing ratchet 5 has a plurality of circumferentially arranged first ratchet teeth 51, and the freehub base ratchet 6 has a plurality of circumferentially arranged second ratchet teeth 61. The first ratchet teeth 51 and the second ratchet teeth 61 are unidirectionally rotatable and mesh. The elastic element 64 drives the freehub base ratchet 6 to move toward the housing ratchet 5 so that the first ratchet teeth 51 and the second ratchet teeth 61 remain engaged.

[0030] Specifically, a spacer 7 is fitted on the central shaft 1 between the inner ring of the first right bearing 42 and the inner ring of the second left bearing 43. The right end of the spacer 7 forms an outwardly protruding annular limiting part 71. An anti-disengagement ring 65 is fitted on the spacer 7. The inner diameter of the anti-disengagement ring 65 is smaller than the outer diameter of the annular limiting part 71. The elastic element 64 is a spring compressed between the end of the base ratchet 6 facing away from the second ratchet 61 and the anti-disengagement ring 65. The inner wall of the base ratchet 6 forms a second step part 63 to support the spring.

[0031] The anti-disengagement ring 65 prevents the spring and the base ratchet 6 from flying off or falling off during disassembly and assembly. The end of the anti-disengagement ring 65 facing away from the spring abuts against the outer ring of the second left bearing 43, separating the anti-disengagement ring 65 from the spacer 7. This structure fixes the anti-disengagement ring 65 relative to the base 3, thereby preventing the spring from being damaged by friction with the anti-disengagement ring 65 during operation, as well as preventing the anti-disengagement ring 65 from being damaged by friction with the spacer 7. The annular limiting part 71 has a first conical surface that contacts the anti-detachment ring 65. The anti-detachment ring has a second conical surface that matches the first conical surface. This structure enables the anti-detachment ring and the spacer to be aligned when not in place, thereby preventing the anti-detachment ring from deviating from the center. In addition, the spacer 7 has a notch 72 that enhances deformation, so that the spacer 7 can hold the central shaft 1 tightly and give the spacer 7 a certain preload on the central shaft 1, further preventing parts from falling off or being lost during disassembly and assembly. The spring is a wave spring, which can improve the flatness and the springing stability of the ratchet 6 of the tower base.

[0032] The outer circumferential surface of the ratchet 5 is formed with a first external spline 52, and the inner circumferential surface of the hub housing 2 is formed with a first internal spline 21 that mates with the first external spline 52. The outer circumferential surface of the freehub ratchet 5 is formed with a second external spline 52, and the inner circumferential surface of the freehub base 3 is formed with a second internal spline 31 that mates with the second external spline 52. Compared with the existing threaded connection structure, the spline fit can improve the load-bearing capacity, facilitate the disassembly and assembly of the hub ratchet 5, and solve the problem of difficult disassembly and assembly of the first right-side bearing 42 of the hub housing 2. The hub housing 2 and the ratchet 5 are facing away from each other. An elastic buffer washer 53 is provided between one end of the first ratchet 51. During operation, the base ratchet 6 will reciprocate. The elastic buffer washer 53 can prevent the housing ratchet 5 from colliding with the hub housing 2 during this process, thereby reducing noise and improving product life. The elastic buffer washer 53 is made of silicone or rubber. Silicone and rubber have oil resistance and temperature resistance. The inner wall of the housing ratchet 5 forms a first step portion 54 to support the elastic buffer washer 53. This structure can facilitate product assembly and reliable positioning of the elastic buffer washer 53.

[0033] Multiple first ratchet teeth 51 arranged in a circle form a concave first conical meshing surface, and multiple second ratchet teeth 61 arranged in a circle form a convex second conical meshing surface that matches the first conical meshing surface. Compared with the existing flat meshing surface, the conical meshing surface can increase the meshing area, maximize the use of material, and has the function of aligning the center, thereby ensuring that the first ratchet teeth 51 and the second ratchet teeth 52 mesh stably and reliably.

[0034] In the above solution, the ratchet 5 of the housing and the hub housing 2 are not fixedly connected. Instead, the ratchet 5 of the housing is movable and can only move along its axial direction. Under the action of the elastic element 64, the ratchet 5 of the housing can be basically fixed relative to the hub housing 2. In this way, when the ratchet 5 of the housing rotates, it can drive the hub housing 2 to rotate. Compared with the existing fixed connection method, the movable setting of the ratchet 5 of the housing facilitates the disassembly and installation of the ratchet 5 of the housing, thereby facilitating the maintenance of the product.

[0035] Example 2, refer to Figure 9 and Figure 10 As shown, this embodiment is basically the same as embodiment one, except that: the anti-detachment retaining ring 65 in embodiment one is not provided, and the elastic element 64 is a spring compressed between the end of the base ratchet 6 facing away from the second ratchet 61 and the outer ring of the second left bearing 43. The inner wall of the base ratchet 6 forms a second step portion 63 to support the spring. Although it does not have an anti-detachment function, it is simpler in structure and lower in cost than embodiment one.

[0036] The above description is merely a preferred embodiment of the present utility model, and therefore cannot be construed as limiting the scope of the present utility model. All equivalent changes and modifications made in accordance with the scope of the patent application and the contents of the specification of the present utility model shall still fall within the scope of the patent of the present utility model.

Claims

1. A bicycle hub, comprising a bottom bracket, a hub housing, and a freehub base, wherein the hub housing and the freehub base are rotatably mounted on the bottom bracket, characterized in that: It also includes a housing ratchet, a freehub ratchet, and an elastic element. Both the housing ratchet and the freehub ratchet are annular structures. The housing ratchet is disposed in the hub housing and can only move along its axial direction. The freehub ratchet is disposed in the freehub base and can only move along its axial direction. The housing ratchet has a plurality of first ratchet teeth arranged in a circle. The freehub ratchet has a plurality of second ratchet teeth arranged in a circle. The first ratchet teeth and the second ratchet teeth can be unidirectionally rotated and meshed. The elastic element drives the freehub ratchet to move toward the housing ratchet so that the first ratchet teeth and the second ratchet teeth remain engaged.

2. A bicycle hub according to claim 1, characterized in that: An elastic buffer washer is provided between the hub housing and the end of the housing ratchet facing away from the first ratchet tooth.

3. A bicycle hub according to claim 2, characterized in that: The elastic buffer gasket is made of silicone or rubber.

4. A bicycle hub according to claim 2, characterized in that: The inner wall of the ratchet housing has a first stepped portion that supports the elastic buffer washer.

5. A bicycle hub according to claim 1, characterized in that: The outer peripheral surface of the ratchet of the housing is formed with a first external spline, the inner peripheral surface of the hub housing is formed with a first internal spline that mates with the first external spline, the outer peripheral surface of the ratchet of the freehub base is formed with a second external spline, and the inner peripheral surface of the freehub base is formed with a second internal spline that mates with the second external spline.

6. A bicycle hub according to claim 1, characterized in that: The circumferentially arranged first ratchet teeth form a concave first conical meshing surface, and the circumferentially arranged second ratchet teeth form a convex second conical meshing surface that is adapted to the first conical meshing surface.

7. A bicycle hub according to any one of claims 1 to 6, characterized in that: The hub housing is rotatably mounted on the central shaft via a first left-side bearing and a first right-side bearing. The freehub base is rotatably mounted on the central shaft via a second left-side bearing and a second right-side bearing. A spacer is fitted on the central shaft between the inner ring of the first right-side bearing and the inner ring of the second left-side bearing. The right end of the spacer has an outwardly protruding annular limiting portion. An anti-detachment ring is fitted on the spacer. The inner diameter of the anti-detachment ring is smaller than the outer diameter of the annular limiting portion. The elastic element is a spring compressed between the end of the freehub base ratchet facing away from the second ratchet tooth and the anti-detachment ring. The end of the anti-detachment ring facing away from the spring abuts against the outer ring of the second left-side bearing, causing the anti-detachment ring to separate from the spacer.

8. A bicycle hub according to claim 7, characterized in that: The annular limiting part has a first conical surface that contacts the anti-detachment ring, and the anti-detachment ring has a second conical surface that matches the first conical surface.

9. A bicycle hub according to any one of claims 1 to 6, characterized in that: The tower base is rotatably mounted on the central shaft via a second left bearing and a second right bearing, and the elastic element is a spring compressed between the end of the ratchet of the tower base facing away from the second ratchet tooth and the outer ring of the second left bearing.

10. A bicycle, characterized in that: Including the bicycle hub as described in any one of claims 1 to 9.

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