Hub
By combining internal and external ratchet designs, the problem of wear and tear on traditional bicycle hub ratchet assemblies is solved, achieving extended service life and weight reduction.
Patent Information
- Application Number
- CN202422951267.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Priority Date
- 2023-12-11
- Filing Date
- 2024-12-02
- Publication Date
- 2025-10-21
- Estimated Expiration
- 2034-12-02
AI Technical Summary
Traditional bicycle hubs with unidirectional ratchet mechanisms are prone to wear and tear over long-term use, reducing their lifespan.
It adopts an inner and outer ratchet combination design. The inner ring tooth is shorter than the outer ring tooth and is made of softer material. The outer ring tooth has a beveled end design. Combined with the meshing of the inner and outer ring teeth of the flywheel seat, it can achieve selective simultaneous or non-simultaneous rotation, reducing wear.
It extends the lifespan of the ratchet assembly, reduces wear, and improves the stability and lightweight effect of the bicycle.
Smart Images
Figure CN223456743U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a bicycle element, in particular to a hub. BACKGROUND
[0002] A conventional bicycle is provided with a hub on the axis of a tire, so that the hub drives the tire to rotate. When a user pedals a pedal to drive the hub to rotate, the hub and the tire rotate, and the bicycle wheel rotates around the hub to drive the bicycle to move forward.
[0003] The current hub includes a one-way ratchet set to make the hub and the pedal disengage when the user stops pedaling the pedal, so that the tire can still rotate. However, the one-way ratchet set is prone to wear and tear, reducing the service life of the ratchet set. SUMMARY
[0004] To solve the problems mentioned in the prior art, the utility model provides a hub, which includes a hub body, a ratchet set built into the hub body, the ratchet set including an outer ratchet including a ring-shaped tooth surface on the side surface of the outer ratchet ring and an outer ring tooth on the end surface of the outer ratchet ring, and an inner ratchet including a ring-shaped tooth groove on the end surface of the inner ratchet ring and an inner ratchet ring tooth on the side surface of the inner ratchet ring, and a freewheel seat engaged with the ratchet set, including an inner ring tooth on the inner surface of the freewheel seat corresponding to the outer ring tooth, engaged with the outer ring tooth, the inner ring tooth has a shorter inner ring tooth surface length than the outer ring tooth surface length, wherein the ratchet set is coaxially movably arranged in the hub body, the outer ratchet and the inner ratchet are engaged with the ring-shaped tooth surface and the ring-shaped tooth groove respectively, so that the hub body and the freewheel seat have a same rotation state or a different rotation state, and when the hub body and the freewheel seat are in different rotation states, the outer ratchet axially displaces relative to the freewheel seat.
[0005] The inner ring tooth has an inner ring groove at the end close to the freewheel seat.
[0006] The inner ring tooth and the outer ring tooth are arranged in overlap.
[0007] The difference between the tooth surface length of the inner ring tooth and the tooth surface length of the outer ring tooth is greater than or equal to the movement distance of the axial displacement of the outer ratchet.
[0008] The material of the inner ring tooth is different from that of the outer ring tooth, and the hardness of the material of the inner ring tooth is relatively soft compared to that of the outer ring tooth.
[0009] The outer ring teeth of the outer ratchet wheel are inclined to the direction of the outer diameter of the outer ring teeth towards the end of the flywheel seat.
[0010] The outer ring teeth of the outer ratchet wheel are inclined to the direction of the outer diameter of the outer ring teeth towards the end of the flywheel seat.
[0011] The axial movement distance of the outer ratchet wheel corresponds to the axial length of the abutting surface. BRIEF DESCRIPTION OF DRAWINGS
[0012] Figure 1 Preferred embodiment of the utility model is the perspective view.
[0013] Figure 2 Preferred embodiment of the utility model is the exploded view.
[0014] Figure 3 Preferred embodiment of the utility model is the first local enlarged view.
[0015] Figure 4 Preferred embodiment of the utility model is the sectional view.
[0016] Figure 5A Preferred embodiment of the utility model is the second local enlarged view.
[0017] Figure 5B Preferred embodiment of the utility model is the third local enlarged view.
[0018] SYMBOL EXPLANATION
[0019] 10 flower drum body
[0020] 20 ratchet wheel set
[0021] 21 outer ratchet wheel
[0022] 211 annular tooth surface
[0023] 212 outer ring teeth
[0024] 22 inner ratchet wheel
[0025] 221 annular tooth groove
[0026] 222 inner ratchet ring teeth
[0027] 30 flywheel seat
[0028] 31 inner ring teeth
[0029] 311 inner ring groove
[0030] D movement distance
[0031] h inner ring tooth surface length
[0032] H outer ring tooth surface length DETAILED DESCRIPTION
[0033] Please refer to Figures 1 to 3 , which is a preferred embodiment of the hub provided by the present invention, comprising a hub body 10, a ratchet assembly 20 built into the hub body 10, and a flywheel seat 30 engaged with the ratchet assembly 20; the hub body 10 can be mounted on an axle of a tire of a bicycle, and the outer periphery of the hub body 10 is used to engage with the tire, and the flywheel seat 30 is engaged and sleeved on the outer periphery of the ratchet assembly 20 and is connected and assembled with a flywheel. When a user steps on a pedal, a chain linked to the flywheel rotates with the pedal, causing the flywheel to rotate together and driving the flywheel seat 30, the hub body 10 and the tire to rotate in conjunction, so that the bicycle runs synchronously, thereby driving the bicycle forward.
[0034] The ratchet assembly 20 is movably disposed within the hub body 10 and is coaxial with the hub body 10 . The ratchet assembly 20 includes an outer ratchet 21 and an inner ratchet 22 . The outer ratchet 21 and the inner ratchet 22 are in one-way meshing engagement.
[0035] In this embodiment, the outer ratchet 21 is annular and includes an annular tooth surface 211 provided on the end surface of one end of the outer ratchet 21 and an outer ring tooth 212 located on the ring side of the outer ratchet 21. The outer ring tooth 212 of the outer ratchet 21 engages with the flywheel seat 30; and the annular tooth surface 211 corresponds to the inner ratchet 22.
[0036] The inner ratchet 22 is annular and includes an annular tooth groove 221 located on the end surface of one end of the inner ratchet 22 and an inner ratchet ring tooth 222 located on the annular side surface of the inner ratchet 22. The inner ratchet 22 engages with the hub body 10 through the inner ratchet ring tooth 222; and is assembled by engaging the annular tooth groove 221 with the annular tooth surface 211 of the outer ratchet 21.
[0037] Please refer to Figure 3 and Figure 4 The annular tooth surface 211 corresponds to the annular tooth groove 221 in concave and convex manner. The one-way engagement refers to the selective mutual engagement between the annular tooth surface 211 and the annular tooth groove 221 according to a relative rotation direction between the outer ratchet 21 and the inner ratchet 22. For example, when the outer ratchet 21 and the inner ratchet 22 rotate in the same clockwise direction around the axis, the outer ratchet 21 and the inner ratchet 22 are engaged with each other; when the outer ratchet 21 and the inner ratchet 22 rotate in two opposite clockwise directions around the axis, the meshing relationship between the outer ratchet 21 and the inner ratchet 22 is released.
[0038] The ring gear 211 comprises at least one ratchet, which comprises a ramp and a stop surface. The stop surface extends in parallel with the axis at one of the end surfaces, and the ramp extends at one of the end surfaces and connects with the end of the stop surface. When the ring gear 211 has multiple ratchets, the ramps of the ratchets extend in the same direction. When the inner ratchet 22 rotates and the stop surface of the ratchet abuts against the ring gear slot 221 of the outer ratchet 21, the inner ratchet 22 and the outer ratchet 21 are engaged with each other. When the inner ratchet 22 rotates in the opposite direction and the ramp abuts against the ring gear slot 221, the outer ratchet 21 and the inner ratchet 22 are disengaged from each other. At this time, the outer ratchet 21 does not rotate with the inner ratchet, and is displaced in parallel with the axis along the ramp, so that at least a portion of the ring gear 211 and the ring gear slot 221 is spaced apart.
[0039] The ratchet set 20 is engaged with the inner ratchet ring 222 of the inner ratchet 22 and the hub body 10, and the outer ratchet 21 is engaged with the outer ratchet ring 212 and the flywheel seat 30, so that the hub body 10 and the flywheel seat 30 rotate with the inner ratchet 22 and the outer ratchet 21, respectively.
[0040] Further, the flywheel seat 30 is sleeved around the outer ratchet 21, and the inner surface of the flywheel seat 30 corresponds to the position of the outer ratchet ring 212 of the outer ratchet 21 to form an inner ratchet ring 31. The inner ratchet ring 31 is used to engage with the outer ratchet ring 212, and the inner ratchet ring 31 can rotate synchronously with the outer ratchet ring 212 when the outer ratchet ring 212 rotates.
[0041] The inner tooth surface length h of the inner ratchet ring 31 is shorter than the outer tooth surface length H of the outer ratchet ring 212, and the inner ratchet ring 31 and the outer ratchet ring 212 are arranged in an overlapping manner.
[0042] When the outer ratchet 21 does not rotate with the inner ratchet 22 and is disengaged from the inner ratchet 22, the outer ratchet ring 212 of the outer ratchet 21 is displaced in parallel with the axis relative to the inner ratchet ring 31 of the flywheel seat 30. Because the inner tooth surface length h of the inner ratchet ring 31 is shorter than the outer tooth surface length H of the outer ratchet ring 212, when the outer ratchet ring 212 is displaced along the inner ratchet ring 31, the end edge of the outer ratchet ring 212 wears or scratches the surface of the inner ratchet ring 31.
[0043] Further, the end of the outer ratchet ring 212 towards the flywheel seat 30 comprises a chamfered surface, which extends obliquely towards the flywheel seat 30 from the outer diameter of the outer ratchet ring 212. This design can reduce the contact area when the outer ratchet ring 212 engages with the inner ratchet ring 31, and avoid that the end edge of the outer ratchet ring 212 wears the inner ratchet ring 31 towards the flywheel seat 30.
[0044] Thus, the ratchet set 20 can utilize the selective engagement between the outer ratchet 21 and the inner ratchet 22 to selectively form a co-rotating state or a counter-rotating state between the hub body 10 and the freewheel seat 30. The co-rotating state and the counter-rotating state will be described in the following paragraphs.
[0045] Referring to Figure 5A When the user pedals the pedal, the chain wrapped around the freewheel rotates with the pedal, and drives the freewheel seat 30 and the hub body 10 to rotate. At this time, the outer ratchet 21 is driven by the freewheel seat 30, and the plurality of inclined surfaces on the annular tooth surface 211 are engaged with the plurality of ratchet teeth on the annular tooth groove 221. A power generated by pedaling the pedal drives the inner ratchet 22 to rotate synchronously with the outer ratchet 21. At this time, the forward direction of the bicycle is the same as the rotation direction of the outer ratchet 21, forming the co-rotating state described above.
[0046] Referring to Figure 5B When the user stops pedaling the pedal, the freewheel seat 30 and the outer ratchet 21 stop rotating, while the rear wheel of the bicycle maintains the rotating state in response to the power generated by the pedal, so that the hub body 10 and the inner ratchet 22 also maintain the rotating state. When the inner ratchet 22 maintains the rotating state, the annular tooth groove 221 is in abutment with the inclined surfaces of the annular tooth surface 211, and slides along the annular tooth surface 211 to the next inclined surface in the rotation direction of the bicycle. At this time, the rotation direction of the inner ratchet 22 is the same as the forward direction of the bicycle, while the outer ratchet 21 stops rotating forward, forming the counter-rotating state described above. Such a counter-rotating state can make the bicycle maintain the forward power when the user stops pedaling the pedal.
[0047] Further, the freewheel set 30 includes a spring that gives the outer ratchet 21 a biasing force towards the inner ratchet 22. When the annular tooth surface 211 has a plurality of ratchet teeth and the outer ratchet 211 is displaced in the direction parallel to the axis towards the freewheel seat 30, the spring presses the outer ratchet 21 to reset towards the inner ratchet 22, so that one of the ratchet teeth corresponds to the next groove in the annular tooth groove 221, so that the outer ratchet 21 can exhibit a reciprocating motion.
[0048] Wherein the axial movement distance D of the outer ratchet 21 corresponds to the axial length of the abutment surface.
[0049] Wherein the difference between the inner ring tooth surface length h of the inner ring tooth 31 and the outer ring tooth surface length H of the outer ring tooth is greater than or equal to the movement distance D of the outer ratchet 21.
[0050] Further, the utility model provides second embodiment of this flower drum, this inner ring tooth 31 is close to the flywheel seat 30 place recessed with an inner ring groove 311, and the surface depth of this inner ring groove 311 is lower than the bottom depth of this outer ring tooth 212, make this outer ring tooth 212 in the process of this reciprocating motion does not injure the ring inside of this inner ring tooth 31. Among them, when this outer ring tooth 212 is in the reciprocating motion, this outer ring tooth 212 will jump in the direction of this inner ring groove 311 axially, make this outer ring tooth 212 at least a part is placed in this inner ring tooth groove 311.
[0051] It is worth noting that because the tooth surface axial length of this inner ring tooth 31 is shorter than this outer ring tooth 212, and this inner ring tooth 31 is overlapped with this outer ring tooth 212, make this outer ring tooth 212 relative to this inner ring tooth 31 reciprocating motion, can prevent the edge of this outer ring tooth 212 from the displacement of the motion distance D to cause the inner ring tooth 31 scratch or wear, further reduce the consumption, damage of this inner ring tooth 31, simultaneously, the tooth surface axial length of this inner ring tooth 31 is shorter than the design of this outer ring tooth 212, also can prevent the outer ring tooth 212 and inner ring tooth 31 when producing a tolerance, reduce the consumption of this inner ring tooth 31.
[0052] Further, the material of the inner ring tooth 31 and the outer ring tooth 212 is different, the hardness of the material selected for the inner ring tooth 31 is relatively soft compared to the outer ring tooth 212; for example, when the material of the outer ring tooth 212 is iron or steel, the material of the inner ring tooth 31 can be selected as aluminum or other materials with lower hardness than iron and steel. This material selection method can effectively reduce the wear of the outer ring tooth 212 during the reciprocating motion, prolong the service life of the outer ring tooth 212 and the inner ring tooth 31, and because the inner ring tooth 31 is made of lightweight aluminum metal, the overall weight is reduced, achieving the purpose of lightweight.
Claims
1. A flower drum, characterized in that, A flower drum body comprising: A ratchet set, which is disposed in the flower drum body, comprising: An outer ratchet, comprising a ring-shaped tooth surface disposed on the side surface of the outer ratchet ring and an outer ring tooth located on the end surface of the outer ratchet ring; and An inner ratchet, comprising a ring-shaped tooth groove located on the end surface of the inner ratchet ring and an inner ratchet ring tooth located on the side surface of the inner ratchet ring; and A flywheel seat, which is engaged with the ratchet set, comprising: An inner ring tooth, which is disposed on the inner surface of the flywheel seat corresponding to the position of the outer ring tooth, is engaged with the outer ring tooth, and has an inner ring tooth surface length shorter than an outer ring tooth surface length of the outer ring tooth; wherein The ratchet set is coaxially movably disposed in the flower drum body, the outer ratchet and the inner ratchet are respectively engaged with the ring-shaped tooth surface and the ring-shaped tooth groove, so that the flower drum body and the flywheel seat are in a same rotating state or a different rotating state, when the flower drum body and the flywheel seat are in the different rotating state, the outer ratchet is axially displaced relative to the flywheel seat.
2. The flower pot as claimed in claim 1, wherein The inner ring tooth is recessed with an inner ring groove near the end of the flywheel seat.
3. The flower pot as claimed in claim 1 or 2, characterized in that The inner ring tooth and the outer ring tooth are overlapped.
4. The hub as set forth in claim 3, wherein The difference between the inner ring tooth surface length of the inner ring tooth and the outer ring tooth surface length of the outer ring tooth is greater than or equal to a movement distance of the axial displacement of the outer ratchet.
5. The hub as set forth in claim 4, wherein The movement distance of the outer ratchet in the axial direction corresponds to an axial length of an abutment surface.
6. The hub of claim 4 wherein, The material of the inner ring tooth is softer than the material of the outer ring tooth.
7. The hub of claim 2 wherein, At least a part of the outer ratchet near the end of the flywheel seat corresponds to the inner ring groove.
8. The festival as claimed in claim 7, wherein The outer ring tooth near the end of the flywheel seat comprises a chamfer surface, which extends obliquely towards the flywheel seat in the direction of the outer diameter of the outer ring tooth.