A bicycle hub and a bicycle

Abstract

The utility model provides a kind of bicycle hub and bicycle, it is related to bicycle technical field, including axle core and the shell and tower base of being sleeved on axle core, wherein shell and tower base are formed with the installation cavity for assembling ratchet structure between, ratchet structure includes first ratchet piece, second ratchet piece and elastic piece, first ratchet piece and second ratchet piece are all sleeved on axle core, first limiting portion for being limited with first ratchet piece along the circumference is shaped in shell, second limiting portion for being limited with second ratchet piece along the circumference is shaped in tower base, elastic piece is located in the other side of second ratchet piece relative to first ratchet piece, to make first ratchet piece limit along the axial direction, second ratchet piece can reciprocate along the axial direction, so that the second helical tooth on the end face of second ratchet piece and the first helical tooth on the end face of first ratchet piece can be one-way engagement. To improve the problem that existing bicycle hub structure is easy to wear and tear and the number of parts is more.

Description

Technical Field

[0001] This utility model relates to the field of bicycle technology, and more specifically, to a bicycle hub and a bicycle. Background Technology

[0002] Traditional bicycle wheel hubs often feature structures similar to those disclosed in Taiwan's Patent No. 088117780, entitled "Wheel Hub Specifically for Bicycles and the Like." In this design, a first and second toothed disc form a ratchet mechanism, with springs at both ends to enable bilateral linear displacement. This type of structure exhibits diverse wear patterns between the two toothed discs, leading to numerous wear issues and consequently poor overall durability and stability of the wheel hub. Furthermore, the large number of components in the wheel hub structure contradicts current trends towards lightweight design, making it difficult to meet the demands of high-end racing bicycle components. Utility Model Content

[0003] This utility model discloses a bicycle wheel hub, which aims to improve the problems of easy wear and tear and large number of parts in the existing bicycle wheel hub structure.

[0004] The present invention adopts the following solution:

[0005] A bicycle hub includes an axle core and a housing and a freehub base sleeved on the axle core. A mounting cavity for assembling a ratchet structure is formed between the housing and the freehub base. The ratchet structure includes a first ratchet plate, a second ratchet plate, and an elastic element. Both the first and second ratchet plates are sleeved on the axle core. A first limiting portion is formed within the housing to circumferentially limit the first ratchet plate. A second limiting portion is formed within the freehub base to circumferentially limit the second ratchet plate. The elastic element abuts against the second ratchet plate on the opposite side of the first ratchet plate, causing the second ratchet plate to abut against the first ratchet plate and corresponding to the axial limiting of the first ratchet plate. The second ratchet plate is axially reciprocating, allowing a second helical tooth on the end face of the second ratchet plate to engage unidirectionally with a first helical tooth on the end face of the first ratchet plate.

[0006] As a further improvement, both the first limiting part and the second limiting part are insert teeth that extend axially, and the sides of both the first ratchet plate and the second ratchet plate are provided with teeth for engaging with the insert teeth.

[0007] As a further improvement, the first limiting part is integrally formed with the shell, and the second limiting part is integrally formed with the tower base.

[0008] As a further improvement, the first ratchet plate is exactly the same as the second ratchet plate.

[0009] As a further improvement, the connection end between the housing and the tower base is equipped with an oil seal to seal the mounting cavity.

[0010] As a further improvement, the elastic element is a wave-shaped flat wire spring.

[0011] As a further improvement, bearings are provided at both ends inside the housing and inside the tower base, and each bearing is sleeved on the shaft core and limited axially.

[0012] As a further improvement, the tower base is provided with an assembly groove, and a gasket is disposed in the assembly groove, with the elastic element abutting between the gasket and the second ratchet plate.

[0013] As a further improvement, a first side cover is provided at the end of the housing away from the tower base, and a second side cover is provided at the end of the tower base away from the housing, with the housing and the tower base being axially limited by the two side covers.

[0014] Another bicycle is provided, including a frame and a bicycle hub as described in any of the preceding claims mounted on the frame.

[0015] By adopting the above technical solution, the present invention can achieve the following technical effects:

[0016] 1. In this application, the first ratchet plate is circumferentially limited to the housing by a first limiting part and axially limited under the action of an elastic element. That is, the first ratchet plate is fixed to the housing, while the second ratchet plate can reciprocate axially under the action of the elastic element, thus achieving unilateral linear movement. This eliminates a major source of wear and avoids reciprocating fretting wear of the first ratchet plate. Wear occurs only on a single interface, resulting in a single wear mode, thereby improving the long-term durability and stability of the system, reducing abnormal noise and performance degradation caused by wear, and extending its lifespan. Furthermore, compared to the double-sided elastic elements in the prior art, the unilateral elastic element reduces frictional resistance and significantly reduces the frictional contact area between the elastic element and adjacent parts, thereby reducing internal resistance during gliding, making the wheel assembly idling smoother and improving its range. It is easy to understand that this application has fewer moving parts. Fewer moving parts and lower friction mean that the second ratchet can be pushed out faster when it needs to engage, achieving a smaller engagement angle (e.g., <3°) and near-instantaneous power response, which is particularly suitable for riding scenarios that require frequent and rapid acceleration (such as mountain biking and road sprinting).

[0017] 2. Both the shell and the freehub base are integrally formed with toothed components, which reduces the need for an external gear ring, decreases component assembly, reduces component costs, and reduces the overall weight of the hub. Compared with existing technologies, this application reduces components such as elastic elements and external gear rings, which can promote the realization of lightweighting, thereby meeting the requirements of high-end racing bicycle components.

[0018] 3. This application has a simple structure with few parts, making it easy to maintain. Fewer parts need to be disassembled and replaced during maintenance, reducing user maintenance costs and time. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0020] Figures 1 to 3 This is a structural schematic diagram of one embodiment of the present invention from different perspectives;

[0021] Figure 4 This is a cross-sectional view of one embodiment of the present invention;

[0022] Figure 5 A schematic diagram of the structure of the first ratchet plate in one embodiment of this utility model;

[0023] Figure 6 A schematic diagram of the structure of the shell according to one embodiment of this utility model;

[0024] Figure 7 Exploded view of one embodiment of this utility model.

[0025] icon:

[0026] 1-Shaft core;

[0027] 2-Housing shell; 21-First limiting part;

[0028] 3-Tower base; 31-Assembly slot; 311-Gasket;

[0029] 4- Mounting cavity;

[0030] 51-First ratchet plate; 511-First helical tooth; 512-Tooth; 52-Second ratchet plate; 53-Elastic element;

[0031] 6-Oil seal;

[0032] 71, 72 - Bearings; 73, 74 - Bearings; 75, 76 - Sleeves;

[0033] 8-First side cover; 81-Sealing ring;

[0034] 9-Second side cover. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model. Therefore, the following detailed description of the embodiments of this utility model provided in the accompanying drawings is not intended to limit the scope of the claimed utility model, but merely represents selected embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0036] The terms “top,” “bottom,” “upper,” “lower,” “left,” “right,” “front,” “back,” and similar expressions used in this document are for illustrative purposes only. The terms “first,” “second,” etc., are only used to distinguish different objects and should not be construed as indicating or implying relative importance or the quantity, specific order, or primary or secondary relationship of the indicated technical features. The term “several” means one or more, and “multiple” means two or more, unless otherwise explicitly specified.

[0037] Example

[0038] Combination Figures 1 to 7 This embodiment provides a bicycle hub, including a spindle core 1, a housing 2 and a freehub base 3 sleeved on the spindle core 1. A mounting cavity 4 for assembling a ratchet structure is formed between the housing 2 and the freehub base 3. The ratchet structure includes a first ratchet plate 51, a second ratchet plate 52, and an elastic element 53. Both the first ratchet plate 51 and the second ratchet plate 52 are sleeved on the spindle core 1. A first limiting portion 21 for circumferentially limiting the first ratchet plate 51 is formed inside the housing 2. A second limiting portion for circumferentially limiting the second ratchet plate 52 is formed inside the freehub base 3. The elastic element 53 abuts against the other side of the second ratchet plate 52 opposite to the first ratchet plate 51, so that the second ratchet plate 52 abuts against the first ratchet plate 51. Corresponding to the axial limiting of the first ratchet plate 51, the second ratchet plate 52 can reciprocate axially, allowing a second helical tooth located on the end face of the second ratchet plate 52 to engage unidirectionally with a first helical tooth 511 located on the end face of the first ratchet plate 51. Preferably, the elastic element 53 is a wave-shaped flat wire spring, which has good elasticity and is resistant to high temperature and corrosion. Its total height and working height are both lower than those of traditional round wire springs, making the structure more compact.

[0039] It should be noted that in this embodiment, the first ratchet plate 51 is circumferentially limited to the housing 2 by the first limiting part 21 and axially limited under the action of the elastic member 53. That is, the first ratchet plate 51 is fixed to the housing 2, while the second ratchet plate 52 can reciprocate axially under the action of the elastic member 53, thereby achieving unilateral linear movement, eliminating a major source of wear, and avoiding reciprocating fretting wear of the first ratchet plate 51. This ensures that wear only occurs on a single interface, with a single wear mode, thereby improving the long-term durability and stability of the system, reducing abnormal noise and performance degradation caused by wear, and thus extending its lifespan. In addition, compared with the double-sided elastic member 53 in the prior art, the unilateral elastic member 53 can reduce frictional resistance and significantly reduce the frictional contact surface between the elastic member 53 and adjacent parts, thereby reducing internal resistance during gliding, making the wheel assembly spin more smoothly and improving its endurance. It is easy to understand that in this embodiment there are fewer moving parts. Fewer moving parts and lower friction mean that the second ratchet plate 52 can be pushed out more quickly when it needs to engage, achieving a smaller engagement angle (e.g., <3°) and near-instantaneous power response, which is particularly suitable for riding scenarios that require frequent and rapid acceleration (such as mountain biking and road sprinting).

[0040] In a preferred embodiment, both the first limiting portion 21 and the second limiting portion are axially extending insert teeth. The sides of both the first ratchet plate 51 and the second ratchet plate 52 are provided with teeth 512 for engaging with the insert teeth. One end of the first ratchet plate 51 abuts against the stepped surface forming the insert teeth, and the other end abuts against the second ratchet plate 52, thereby limiting the movement axially. In this embodiment, the insert teeth connection makes the transmission smoother and ensures transmission efficiency.

[0041] Furthermore, the first limiting part 21 is integrally formed with the housing 2, and the second limiting part is integrally formed with the freehub base 3. Both the housing 2 and the freehub base 3 have integrally formed teeth, which reduces the need for an external gear ring, reduces component assembly, lowers component costs, and reduces the overall weight of the wheel hub. Compared with existing technologies, the reduction of components such as the elastic element 53 and the external gear ring promotes lightweighting, thereby meeting the requirements of high-end racing bicycle components. Preferably, the housing 2 and / or the freehub base 3 are made of a special aluminum alloy to ensure the strength and hardness of the teeth, preventing damage to the teeth during transmission and causing transmission failure. The special aluminum alloy can be of grades such as 7075 or 7079, and is not specifically limited.

[0042] Based on the above embodiments, in an optional embodiment of this utility model, the first ratchet plate 51 and the second ratchet plate 52 are completely identical. This reduces the number of molds and further reduces parts costs. It also facilitates parts management and assembly, avoiding problems such as misassembly or incorrect assembly. Preferably, the ratchet plate can be coated with a coating that enhances hardness and wear resistance, such as titanium nitride, to make the ratchet plate more wear-resistant and corrosion-resistant, thereby further ensuring the performance of the wheel hub.

[0043] In another embodiment, an oil seal 6 is provided at the connection end between the housing 2 and the tower base 3 to seal the mounting cavity 4 and prevent the ratchet structure inside the mounting cavity 4 from being corroded.

[0044] In one embodiment, bearings are provided at both ends inside the housing 2 and the tower base 3. Each bearing is sleeved on the shaft core 1 and axially limited to reduce the friction between the housing 2 and the tower base 3 and the shaft core 1, ensuring smooth rotation of both. Specifically, the two bearings (71, 72) of the housing 2 are limited by mounting grooves on the housing 2, and sleeves (75, 76) are arranged between the two bearings (73, 74) of the tower base 3 and between the tower base 3 and the bearing (72) of the housing, so that the two bearings are axially limited, thereby reducing the structure on the tower base 3 and facilitating mold opening. Preferably, a first side cover 8 is provided at the end of the housing 2 away from the tower base 3, and a second side cover 9 is provided at the end of the tower base 3 away from the housing 2. The housing 2 and the tower base 3 are axially limited by the two side covers. The two side covers are sealed to the shaft core 1 by a sealing ring 81. The connection between the side cover and the shaft core 1 can be achieved by a threaded connection, or by setting slots on the side cover and the shaft core 1, inserting a retaining ring into the slot to fix the side cover and the shaft core 1, thereby achieving the connection between the side cover and the shaft core 1, so that the housing 2 and the tower base 3 are limited along the axial direction of the shaft core 1. This is not limited to these methods and no specific limitation is made.

[0045] In other embodiments, the tower base 3 is provided with an assembly groove 31, and a gasket 311 is disposed in the assembly groove 31. The elastic element 53 abuts against the gasket 311 and the second ratchet plate 52. The gasket 311 ensures the flatness of the elastic element 53, thereby ensuring the smooth and precise meshing of the two ratchet plates. Secondly, it can protect the bearing (73) adjacent to the elastic element 53 to avoid friction between the bearing (73) and the elastic element 53. It should be mentioned that the structure of this embodiment is simple, with few parts, and easy to maintain. Fewer parts need to be disassembled and replaced during maintenance, which can reduce the user's maintenance costs and time.

[0046] Another embodiment of this utility model provides a bicycle, including a frame and a bicycle hub as described in any of the above embodiments, mounted on the frame. By simplifying the structure of the bicycle hub, the overall bicycle is made lighter, thereby meeting market demands and enhancing product competitiveness.

[0047] The above are merely preferred embodiments of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions that fall within the scope of this utility model's concept are protected by this utility model.

Claims

1. A bicycle wheel hub, characterized in that, The device includes a shaft core, a housing and a base sleeved on the shaft core, and a mounting cavity for assembling a ratchet structure between the housing and the base. The ratchet structure includes a first ratchet plate, a second ratchet plate, and an elastic element. The first and second ratchet plates are both sleeved on the shaft core. A first limiting portion is formed inside the housing to limit the first ratchet plate circumferentially, and a second limiting portion is formed inside the base to limit the second ratchet plate circumferentially. The elastic element abuts against the second ratchet plate on the opposite side of the first ratchet plate, so that the second ratchet plate abuts against the first ratchet plate and is axially limited to the first ratchet plate. The second ratchet plate can reciprocate axially, so that the second helical tooth on the end face of the second ratchet plate can engage unidirectionally with the first helical tooth on the end face of the first ratchet plate.

2. The bicycle wheel hub according to claim 1, characterized in that, Both the first limiting part and the second limiting part are insert teeth that extend axially, and the sides of the first ratchet plate and the second ratchet plate are provided with teeth for engaging with the insert teeth.

3. The bicycle wheel hub according to claim 2, characterized in that, The first limiting part is integrally formed with the shell, and the second limiting part is integrally formed with the tower base.

4. The bicycle hub according to any one of claims 1-3, characterized in that, The first ratchet plate is exactly the same as the second ratchet plate.

5. The bicycle wheel hub according to claim 1, characterized in that, An oil seal is provided at the connection end between the housing and the tower base to seal the mounting cavity.

6. The bicycle wheel hub according to claim 1, characterized in that, The elastic element is a wave-shaped flat wire spring.

7. The bicycle hub according to claim 1, characterized in that, Bearings are provided at both ends inside the housing and inside the tower base, and each bearing is sleeved on the shaft core and limited along the axial direction.

8. The bicycle wheel hub according to claim 1, characterized in that, The tower base is provided with an assembly groove, and a gasket is disposed in the assembly groove. The elastic element abuts between the gasket and the second ratchet plate.

9. The bicycle hub according to claim 1, characterized in that, The housing is provided with a first side cover at the end away from the tower base, and the tower base is provided with a second side cover at the end away from the housing. The housing and the tower base are axially limited by the two side covers.

10. A bicycle, characterized in that, Includes the vehicle body and the bicycle wheel hub as described in any one of claims 1-9 mounted on the vehicle body.

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