Anti-backlash bicycle hub and bicycle

Abstract

The anti-backlash bicycle hub comprises a center shaft, a hub shell, a left side bearing and a right side bearing, the hub shell is rotatably arranged on the center shaft in a sleeving mode through the left side bearing and the right side bearing, and the anti-backlash bicycle hub is characterized in that an outer ring of the left side bearing is tightly matched with the hub shell, and an inner ring of the left side bearing is movably arranged on the center shaft in a sleeving mode; an outer ring of the right bearing is in close fit with the hub shell, an inner ring of the right bearing is fixedly arranged relative to the middle shaft, a first limiting protruding ring located on the left side of the left bearing is formed on the peripheral face of the middle shaft, and an elastic piece is arranged between the limiting protruding ring and the inner ring of the left bearing and can apply opposite elastic force to the inner ring of the left bearing and the middle shaft. Therefore, the clearance between the left bearing and the right bearing is eliminated.

Description

Technical Field

[0001] This utility model relates to bicycle accessories, and more particularly to a gap-free bicycle hub. Background Technology

[0002] A bicycle hub mainly consists of a bottom bracket, hub housing, left bearing, right bearing, and freehub. A one-way drive mechanism connects the freehub to the hub housing. The hub housing is rotatably mounted on the bottom bracket via the left and right bearings. The freehub is rotatably mounted on the bottom bracket and located to the right of the right bearing. Because these bearings have some play, it is crucial to eliminate this play during hub assembly; otherwise, the wheel will wobble. Traditional designs lack a mechanism to adjust play; during assembly, the outer ring of the bearing is directly pressed against the hub housing. Due to variations in machining tolerances, the bearing positions on the hub housing cannot be aligned with consistent assembly force. Excessive assembly force results in uneven bearing rotation, while insufficient force leads to play and wheel wobble. Summary of the Invention

[0003] The purpose of this invention is to address the shortcomings of existing technologies by providing a backlash-eliminating bicycle hub that can eliminate bearing backlash.

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

[0005] A backlash-free bicycle hub includes a bottom bracket, a hub housing, a left bearing, and a right bearing. The hub housing is rotatably mounted on the bottom bracket via the left and right bearings. The hub is characterized by: the outer ring of the left bearing tightly fitting the hub housing; the inner ring of the left bearing movably fitting on the bottom bracket; the outer ring of the right bearing tightly fitting the hub housing; and the inner ring of the right bearing fixed relative to the bottom bracket. A first limiting protrusion is formed on the outer circumference of the bottom bracket, located to the left of the left bearing. An elastic element is provided between the limiting protrusion and the inner ring of the left bearing. This elastic element can apply opposite elastic forces to the inner ring of the left bearing and the bottom bracket, thereby eliminating backlash between the left and right bearings.

[0006] In the above scheme, the elastic element can simultaneously apply elastic forces in opposite directions to the inner ring and the central shaft of the left bearing. The elastic force causes the inner ring of the left bearing to move to the right to eliminate the clearance of the left bearing, and the elastic force causes the central shaft to move to the left, thereby causing the inner ring of the right bearing to move to the left to eliminate the clearance of the right bearing.

[0007] The outer circumferential surface of the central shaft is provided with a second limiting protrusion ring that can abut against the left end of the inner ring of the right bearing. The inner diameter of the inner ring of the left bearing is larger than the outer diameter of the second limiting protrusion ring. In this way, during assembly, the right end of the central shaft can pass through the left bearing and the right bearing in sequence, which facilitates the assembly of the product.

[0008] It also includes a tower base, which is rotatably mounted on the central shaft via a left tower base bearing and a right tower base bearing and is located to the right of the right bearing. The outer circumferential surface of the right end of the central shaft is provided with an external thread, and a shaft retainer is provided at the right end of the central shaft. The shaft retainer has an internal thread that meshes with the external thread. The shaft retainer is pressed against the inner ring of the right tower base bearing. During assembly, the right end of the central shaft passes through the left bearing, the right bearing, the left tower base bearing and the right tower base bearing in sequence and is then locked by the shaft retainer. This facilitates product assembly and reliably positions the installation of each part.

[0009] The inner circumferential surface of the hub housing is provided with a first limiting step that can abut against the right end of the outer ring of the left bearing. The first limiting step can restrict the position of the outer ring of the left bearing. The elastic element and the first limiting step are arranged opposite each other to ensure the installation position of the left bearing and prevent the left bearing from shifting.

[0010] The inner circumferential surface of the hub housing is provided with a second limiting step that can abut against the left end of the outer ring of the right bearing. When the elastic element drives the central axis to move to the left, causing the inner ring of the right bearing to move to the left, the second limiting step can restrict the outer ring of the right bearing from moving to the left, thereby preventing the right bearing from shifting.

[0011] A first spacer is fitted on the central shaft between the inner ring of the right bearing and the inner ring of the left hub base bearing. The left bearing is located at the left end of the central shaft, and the right bearing is located approximately in the middle of the central shaft. That is, the right bearing is the main load-bearing component, and the left bearing is the secondary load-bearing component. The inner ring of the right bearing is fixed relative to the central shaft, which can effectively prevent the shearing force and wear generated by the inner ring of the right bearing on the central shaft. Even if the inner ring of the left bearing is movably fitted on the central shaft, the stability of the hub housing support can be guaranteed.

[0012] A second spacer is fitted on the central shaft between the inner rings of the left and right tower base bearings. The second spacer is used to restrict the installation position of the inner rings of the left and right tower base bearings.

[0013] The elastic element is a wave spring or a helical compression spring, which facilitates product assembly.

[0014] A bicycle, characterized in that it includes the aforementioned bicycle hub. Attached Figure Description

[0015] The present invention will now be described in further detail with reference to the accompanying drawings.

[0016] Figure 1 This is the front view of the present invention.

[0017] Figure 2 for Figure 1Sectional view along direction AA.

[0018] Figure 3 for Figure 2 Enlarged view of part B.

[0019] Figure 4 This is an exploded view of the components of this utility model.

[0020] Figure 5 This is an exploded view of the components from another perspective of the present invention. Detailed Implementation

[0021] Reference Figures 1 to 5 As shown, a backlash-free bicycle hub includes a bottom bracket 1, a hub housing 2, a left bearing 41, a right bearing 42, a freehub base 3, a left freehub base bearing 61, a right freehub base bearing 62, a housing ratchet 91, and a spring 92. The hub housing 2 is rotatably mounted on the bottom bracket 1 via the left bearing 41 and the right bearing 42. The freehub base 3 is rotatably mounted on the bottom bracket 1 via the left freehub base bearing 61 and the right freehub base bearing 62 and is located to the right of the right bearing 42. The housing ratchet 91 cannot rotate relative to the hub housing 2 but can rotate along its axial direction. The housing ratchet 91 has multiple first ratchet teeth 911 arranged in a circle, and the freehub base 3 has multiple second ratchet teeth 31 that can mesh with the first ratchet teeth 911. The spring 92 is used to drive the housing ratchet 91 to move toward the freehub base 3, so that the first ratchet teeth 911 and the second ratchet teeth 31 are engaged. The engagement of the first ratchet teeth 911 and the second ratchet teeth 31 allows the freehub base 3 to rotate unidirectionally relative to the hub housing 2 or drive the hub housing 2 to rotate. In order to prevent dust and other pollution, a sealing ring 32 is provided between the freehub base 3 and the hub housing 2.

[0022] The outer ring of the left bearing 41 is tightly fitted with the hub housing 2. The inner ring 412 of the left bearing 41 is movably fitted onto the central shaft 1. The outer ring 421 of the right bearing 42 is tightly fitted with the hub housing 2. The inner ring 422 of the right bearing 42 is fixed relative to the central shaft 1. A first limiting protrusion 11 located to the left of the left bearing 41 is formed on the outer circumferential surface of the central shaft 1. An elastic element 5 is provided between the limiting protrusion 11 and the inner ring 412 of the left bearing 41. The elastic element 5 can apply opposite elastic forces to the inner ring 412 of the left bearing 41 and the central shaft 1, thereby eliminating the clearance between the left bearing 41 and the right bearing 42. The elastic element is a wave spring, or a helical compression spring or the like can be selected as needed.

[0023] The outer circumferential surface of the central shaft 1 is provided with a second limiting protrusion ring 12 that can abut against the left end of the inner ring 422 of the right bearing 42. The inner diameter of the inner ring 4112 of the left bearing 41 is larger than the outer diameter of the second limiting protrusion ring 12. In this way, during assembly, the right end of the central shaft 1 can pass through the left bearing 41 and the right bearing 42 in sequence, which facilitates the assembly of the product. Specifically, the outer circumferential surface of the right end of the central shaft 1 is provided with an external thread 13, and the right end of the central shaft 1 is provided with a shaft retainer 8. The shaft retainer 8 forms an internal thread 81 that meshes with the external thread 13. The shaft retainer 8 is pressed against the right tower base shaft. The inner ring of bearing 62 is fitted on the central shaft 1. A first spacer 71 is located between the inner ring 422 of the right bearing 42 and the inner ring of the left tower base bearing 61, and a second spacer 72 is located between the inner ring of the left tower base bearing 61 and the inner ring of the right tower base bearing 62. During assembly, the right end of the central shaft 1 passes through the left bearing 41, the right bearing 42, the first spacer 71, the left tower base bearing 61, the second spacer 72, and the right tower base bearing 62 in sequence, and is then locked by the shaft retainer 8. This facilitates the assembly of the product and reliably positions the installation of each part.

[0024] The inner circumferential surface of the hub housing 2 is provided with a first limiting step 21 that can abut against the right end of the outer ring 411 of the left bearing 41. The first limiting step 21 can restrict the position of the outer ring 411 of the left bearing 41. The elastic element 5 and the first limiting step 21 are arranged opposite each other to ensure the installation position of the left bearing 41 and prevent the left bearing 41 from shifting. The inner circumferential surface of the hub housing 2 is provided with a second limiting step 22 that can abut against the left end of the outer ring of the right bearing 42. When the elastic element 5 drives the central shaft 1 to move to the left and drives the inner ring 422 of the right bearing 42 to move to the left, the second limiting step 22 can restrict the outer ring 421 of the right bearing 42 to move to the left, thereby preventing the right bearing 42 from shifting.

[0025] The elastic element 5 can simultaneously apply elastic forces in opposite directions to the inner ring 412 of the left bearing 41 and the central shaft 1. The elastic force causes the inner ring 412 of the left bearing 41 to move to the right to eliminate the clearance of the left bearing 41. The elastic force causes the central shaft 1 to move to the left, which in turn causes the inner ring 422 of the right bearing 42 to move to the left to eliminate the clearance of the right bearing 42.

[0026] In the above scheme, the left bearing 41 is located at the left end of the central shaft 1, and the right bearing 42 is located approximately in the middle of the central shaft 1. That is, the right bearing 42 is the main force-bearing component, and the left bearing 41 is the secondary force-bearing component. The inner ring 422 of the right bearing 42 is fixed relative to the central shaft 1, which can effectively prevent the shear force and wear generated by the inner ring of the right bearing 42 on the central shaft 1. Even if the inner ring 412 of the left bearing 41 is movably sleeved on the central shaft 1, the stability of the hub housing 2 can be guaranteed.

[0027] 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 backlash-free bicycle hub, comprising a bottom bracket, a hub housing, a left bearing, and a right bearing, wherein the hub housing is rotatably mounted on the bottom bracket via the left and right bearings, characterized in that: The outer ring of the left bearing fits tightly with the hub housing, and the inner ring of the left bearing is movably fitted onto the bottom shaft. The outer ring of the right bearing fits tightly with the hub housing, and the inner ring of the right bearing is fixed relative to the bottom shaft. A first limiting protrusion is formed on the outer circumferential surface of the bottom shaft, located to the left of the left bearing. An elastic element is provided between the limiting protrusion and the inner ring of the left bearing. The elastic element can apply opposite elastic forces to the inner ring of the left bearing and the bottom shaft, thereby eliminating the clearance between the left and right bearings.

2. The backlash-free bicycle hub according to claim 1, characterized in that: The outer circumferential surface of the central shaft is provided with a second limiting protrusion that can abut against the left end of the inner ring of the right bearing, and the inner diameter of the inner ring of the left bearing is larger than the outer diameter of the second limiting protrusion.

3. A backlash-free bicycle hub according to claim 2, characterized in that: It also includes a tower base, which is rotatably mounted on the central shaft and located to the right of the right bearing via a left tower base bearing and a right tower base bearing. The outer circumferential surface of the right end of the central shaft is provided with an external thread, and a shaft retainer is provided at the right end of the central shaft. The shaft retainer has an internal thread that meshes with the external thread, and the shaft retainer is pressed against the inner ring of the right tower base bearing.

4. A backlash-free bicycle hub according to claim 1, characterized in that: The inner circumferential surface of the hub housing is provided with a first limiting step that can abut against the right end of the outer ring of the left bearing.

5. A backlash-free bicycle hub according to claim 1, characterized in that: The inner circumferential surface of the hub housing is provided with a second limiting step that can abut against the left end of the outer ring of the right bearing.

6. A backlash-free bicycle hub according to claim 3, characterized in that: A first spacer is fitted on the central shaft between the inner ring of the right bearing and the inner ring of the left tower base bearing. The left bearing is located at the left end of the central shaft, and the right bearing is located approximately in the middle of the central shaft.

7. A backlash-free bicycle hub according to claim 6, characterized in that: A second spacer is fitted onto the central shaft between the inner ring of the left tower base bearing and the inner ring of the right tower base bearing.

8. A backlash-free bicycle hub according to any one of claims 1 to 7, characterized in that: The elastic element is a wave spring or a helical compression spring.

9. A bicycle, characterized in that: Including the bicycle hub as described in any one of claims 1 to 8.

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