Bicycle hub and bicycle

Abstract

The bicycle hub comprises a center shaft, a hub shell, a tower footing, a shell ratchet wheel, a tower footing ratchet wheel and an elastic piece, the hub shell and the tower footing are both rotatably arranged on the center shaft in a sleeving mode, the shell ratchet wheel is arranged on the hub shell in a mode of being incapable of rotating relative to the hub shell, and the tower footing ratchet wheel is arranged on the tower footing in a mode of being incapable of rotating relative to the tower footing. At least one of the shell ratchet wheel and the tower footing ratchet wheel can move in the axial direction of the middle shaft, the elastic piece drives the shell ratchet wheel and the tower footing ratchet wheel to be meshed, and is characterized in that the shell ratchet wheel is provided with a plurality of first ratchets which are arranged in a convex or concave conical shape, and the tower footing ratchet wheel is provided with a plurality of second ratchets which are arranged in a concave or convex conical shape; the first ratchet and the second ratchet are meshed in a matched mode, a certain angle is formed between a reference line connecting the center of the shell ratchet wheel and the outer side end of the top edge of the first ratchet and the top edge of the first ratchet along the orthographic projection of the shell ratchet wheel in the axial direction, the meshing area can be increased, and acting force facing the center of the meshing face is formed when the first ratchet and the second ratchet are meshed.

Description

Technical Field

[0001] This utility model relates to bicycle accessories, and more particularly to bicycle hubs. Background Technology

[0002] The bicycle hub connects the chain and axle, making it a crucial component of a bicycle. As is generally known, a standard bicycle hub includes a bottom bracket, hub housing, freehub body, housing ratchet, freehub body ratchet, and a spring mechanism. The hub housing is rotatably mounted on the bottom bracket via bearings, as is the freehub body. A ratchet assembly connects the hub housing and the freehub body. This 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. Neither the housing ratchet nor the freehub body ratchet can rotate relative to the hub housing. At least one of the wheels can move axially along the central axis. The elastic element drives the housing ratchet and the freehub ratchet to mesh. The housing ratchet has a plurality of first ratchet teeth arranged in a circle, and the freehub ratchet has a plurality of second ratchet teeth arranged in a circle. The first and second ratchet teeth mesh, allowing the freehub to rotate unidirectionally relative to the hub housing or drive the hub housing to rotate. The top edges of the existing first and second ratchet teeth extend radially along the ratchet. The meshing area of ​​the ratchet teeth in this structure is small, not reliable and stable, and prone to problems such as disengagement and misalignment. Summary of the Invention

[0003] The purpose of this invention is to address the shortcomings of existing technologies by providing a bicycle hub that ensures a reliable and stable engagement between the housing ratchet and the freehub ratchet.

[0004] The objective of this utility model is achieved through the following technical solution:

[0005] A bicycle hub includes a bottom bracket, a hub housing, a freehub, a housing ratchet, a freehub ratchet, and an elastic element. Both the hub housing and the freehub are rotatably mounted on the bottom bracket. The housing ratchet is fixedly mounted on the hub housing relative to the hub housing, and the freehub ratchet is fixedly mounted on the freehub. At least one of the housing ratchet and the freehub ratchet is axially movable along the bottom bracket. The elastic element drives the housing ratchet and the freehub ratchet to engage. The hub is characterized by having a plurality of first ratchet teeth arranged in a conical shape (either convex or concave), and a plurality of second ratchet teeth arranged in a conical shape (either concave or convex). The first and second ratchet teeth are adapted to engage. The reference line connecting the center of the housing ratchet and the outer edge of the top edge of the first ratchet, projected along the axial direction of the housing ratchet, forms an angle with the top edge of the first ratchet, causing a force to be generated towards the center of the engagement surface when the first and second ratchet teeth are engaged.

[0006] In the above scheme, the conical arrangement of the first and second ratchet teeth can maintain a stable and reliable concentricity during the engagement of the housing ratchet and the base ratchet. The orthogonal projection along the axial direction of the housing ratchet, with the reference line connecting the center of the housing ratchet and the outer end of the top edge of the first ratchet forming a certain angle with the top edge of the first ratchet, can increase the meshing area and generate a force towards the center of the meshing surface when the first and second ratchet teeth are engaged, thereby ensuring a reliable and stable engagement between the housing ratchet and the base ratchet.

[0007] The orthographic projection along the axial direction of the ratchet in the housing, the angle between the reference line connecting the center of the ratchet in the housing and the outer end of the top edge of the first ratchet and the top edge of the first ratchet is 15-45 degrees. Within this angle range, the force toward the center of the meshing surface can be sufficiently large, making the meshing of the ratchet in the housing and the ratchet base more reliable and stable. If the angle is too small, the force is insufficient to achieve stable meshing between the ratchet in the housing and the ratchet base; while if the angle is too large, the machining accuracy requirements cannot be met.

[0008] The included angle is 20-30 degrees, which can ensure the stability of the engagement between the ratchet of the housing and the ratchet of the tower base, and is also conducive to the processing of the product.

[0009] The first and second ratchet teeth form a conical meshing surface with a cone angle of 120-150 degrees. This angle range is more conducive to product processing and ensures the concentricity of the housing ratchet and the base ratchet.

[0010] The ratchet base is integrally formed with the base, which reduces the number of product parts and lowers costs.

[0011] The housing ratchet has multiple first ratchet teeth arranged in an outward conical shape, while the base ratchet has multiple second ratchet teeth arranged in an inward conical shape.

[0012] The top edges of the first and second ratchet teeth are machined to form a flat chamfer, which makes the product easier to process.

[0013] The housing ratchet is movably mounted on the hub housing along the axial direction of the central shaft. The hub housing and the housing ratchet are movably engaged by a spline structure. The elastic element drives the housing ratchet to move toward the freehub ratchet, thus keeping the housing ratchet and the freehub ratchet engaged.

[0014] The elastic element is a spring.

[0015] A bicycle, characterized in that it includes the aforementioned bicycle hub. Attached Figure Description

[0016] The present invention will now be described in further detail with reference to the accompanying drawings.

[0017] Figure 1This is a front view of the present invention.

[0018] Figure 2 for Figure 1 A sectional view along the AA direction.

[0019] Figure 3 This is an exploded view of the hub shell, elastic element, shell ratchet, and hub base.

[0020] Figure 4 An exploded view of the hub shell, elastic element, shell ratchet, and freehub base from another perspective.

[0021] Figure 5 This is a three-dimensional view of the ratchet housing.

[0022] Figure 6 This is a three-dimensional view of the tower base.

[0023] Figure 7 This is an axial view of the ratchet housing.

[0024] Figure 8 This is a side view of the ratchet housing. Detailed Implementation

[0025] Reference 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 4, a freehub base ratchet 5, and an elastic element 5. The hub housing 2 is rotatably mounted on the bottom bracket 1 via a left bearing 61 and a right bearing 62. The freehub base 3 is rotatably mounted on the bottom bracket 1 via a left freehub base bearing 63 and a right freehub base bearing 64. The housing ratchet 4 is fixedly mounted on the hub housing 2 without rotatability relative to the hub housing 2. Specifically, a first spline 42 is formed on the outer circumferential surface of the housing ratchet 4, and a second spline 21 is formed on the inner wall of the hub housing 2 that engages with the first spline 42. The engagement of the first spline 42 and the second spline 21 allows the housing ratchet 4 to move axially along the bottom bracket 1 but not to rotate relative to the hub housing 2. The freehub base ratchet is fixed relative to the freehub base ratchet 5. 3 is rotatably mounted on the base 3. Specifically, the base ratchet is integrally formed with the base 3, that is, the ratchet teeth of the base ratchet are directly machined into the base 3. The elastic element 5 drives the housing ratchet 4 to move toward the base 3 so that the housing ratchet 4 and the base ratchet are engaged. Specifically, the elastic element 5 is a helical compression spring. The housing ratchet 4 has a plurality of first ratchet teeth 41 arranged in an outward conical shape, that is, a plurality of first ratchet teeth 41 are machined into the outward conical end face of the housing ratchet 4. The base ratchet has a plurality of second ratchet teeth 31 arranged in an inward conical shape, that is, a plurality of second ratchet teeth 31 are machined into the inward conical end face of the base 3. The cross-section of the first ratchet teeth 41 and the second ratchet teeth 31 is a triangle with a chamfered apex.

[0026] The first ratchet 41 and the second ratchet 31 are adapted to mesh. The reference line connecting the center C2 of the ratchet 4 and the outer end of the top edge 411 of the first ratchet 41, projected along the axial direction of the ratchet 4 in the housing, forms an angle of 26 degrees with the top edge 411 of the first ratchet. This ensures that when the first ratchet 41 and the second ratchet 31 mesh, they generate a force towards the center C1 of the meshing surface. Of course, the aforementioned angle can also be selected within the range of 15-45 degrees as needed. Within this angle range, the force towards the center C1 of the meshing surface can be ensured to be sufficiently large, allowing the first ratchet 41 and the second ratchet 31 to mesh effectively. The meshing of the two ratchet teeth 31 is more reliable and stable. If the included angle is too small, the force is insufficient to achieve stable meshing between the first ratchet tooth 41 and the second ratchet tooth 31; while if the included angle is too large, the machining accuracy requirements cannot be met. The optimal included angle range is 20-30 degrees, which can ensure the stability of the meshing between the first ratchet tooth 41 and the second ratchet tooth 31 and is also conducive to the machining of the product. The top edges 411 and 311 of the first ratchet tooth 41 and the second ratchet tooth 31 are machined to form a flat chamfer. This structure is more conducive to the machining of the product. The aforementioned top edges 411 and 311 extend in a straight line or nearly in a straight line.

[0027] In the above scheme, the conical arrangement of the first ratchet 41 and the second ratchet 31 can maintain a stable and reliable concentricity during the engagement of the housing ratchet 4 and the base 3; and the reference line connecting the center of the housing ratchet 4 and the outer end of the top edge 411 of the first ratchet 41, which is projected along the axial direction of the housing ratchet 4, forms a certain angle with the top edge 411 of the first ratchet 41, which can increase the meshing area and make the first ratchet 41 and the second ratchet 31 form a force toward the center C1 of the meshing surface when they are engaged, thereby ensuring that the first ratchet 41 and the second ratchet 31 are firmly and stably engaged.

[0028] The first ratchet 41 and the second ratchet 31 form a conical meshing surface with a cone angle of 143 degrees. This angle range is more conducive to the processing of the product and to ensuring the concentricity of the housing ratchet 4 and the base 3.

[0029] 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, a freehub base, a housing ratchet, a freehub base ratchet, and an elastic element, wherein both the hub housing and the freehub base are rotatably mounted on the bottom bracket, the housing ratchet is fixedly mounted on the hub housing relative to the hub housing, and the freehub base ratchet is fixedly mounted on the freehub base relative to the freehub base, at least one of the housing ratchet and the freehub base ratchet is axially movable along the bottom bracket, and the elastic element drives the housing ratchet and the freehub base ratchet to engage, characterized in that: The housing ratchet has multiple first ratchet teeth arranged in a conical shape with outward or inward convexity, and the base ratchet has multiple second ratchet teeth arranged in a conical shape with inward or outward convexity. The first and second ratchet teeth are adapted to mesh. The reference line connecting the center of the housing ratchet and the outer end of the top edge of the first ratchet tooth is at a certain angle to the top edge of the first ratchet tooth when the first and second ratchet teeth are meshing, so that when the first and second ratchet teeth are meshing, they generate a force toward the center of the meshing surface.

2. The bicycle hub according to claim 1, characterized in that: The orthogonal projection along the axial direction of the ratchet in the housing, the angle between the reference line connecting the center of the ratchet in the housing and the outer end of the top edge of the first ratchet and the top edge of the first ratchet is 15-45 degrees.

3. The bicycle hub according to claim 2, characterized in that: The included angle is 20-30 degrees.

4. The bicycle hub according to any one of claims 1 to 3, characterized in that: The first and second ratchet teeth form a conical meshing surface with a cone angle of 120-150 degrees.

5. The bicycle hub according to any one of claims 1 to 3, characterized in that: The ratchet of the tower base is integrally formed with the tower base.

6. The bicycle hub according to any one of claims 1 to 3, characterized in that: The housing ratchet has multiple first ratchet teeth arranged in an outward conical shape, while the base ratchet has multiple second ratchet teeth arranged in an inward conical shape.

7. The bicycle hub according to any one of claims 1 to 3, characterized in that: The top edges of the first and second ratchet teeth are machined to form a flat chamfer.

8. The bicycle hub according to any one of claims 1 to 3, characterized in that: The housing ratchet is movably mounted on the hub housing along the axial direction of the central axis. The hub housing and the housing ratchet are movably engaged by a spline structure. The elastic element drives the housing ratchet to move toward the base ratchet.

9. The bicycle hub according to claim 8, characterized in that: The elastic element is a spring.

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

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