Bicycle freewheel

Abstract

A bicycle hub ratchet includes a hub shell, a shaft, a ratchet gear ring, a gear ring, a clutch piece; the gear ring is rotatably connected with the clutch piece, the hub shell is used for connecting with a wheel, and a shaft is pivotally arranged at the center of the hub shell; a gear is fixedly arranged on one side of the gear ring, and a locking portion is arranged on the opposite side of the gear ring; the locking portion includes at least one locking groove, at least one pawl and at least one elastic piece, one end of the pawl is rotatably arranged in the corresponding locking groove, and one elastic piece is arranged in each locking groove; the elastic piece is used for pushing the other end of the pawl out of the locking groove; a resistance structure is used for increasing the rotational resistance of the clutch piece; when the gear rotates in a first direction around the shaft, the hub shell is driven to rotate by the gear; when the gear rotates in a second direction around the shaft, the pawl is separated from the corresponding tooth groove through the rotational resistance of the clutch piece, and the pawl moves to the inside of the retraction groove through the blocking of the connecting port edge.

Description

Technical Field

[0001] This utility model relates to the field of ratchet structures, and in particular to a bicycle hub ratchet. Background Technology

[0002] The bicycle moves forward primarily by pedaling, which rotates the crank and drives the chain to the freewheel on the rear wheel. The freewheel then drives the bushing assembly and hub, causing the rear wheel to rotate and propelling the bicycle forward. To ensure the wheel continues to move forward due to inertia when not pedaling, a ratchet assembly is installed between the hub and bushing assembly, rotating in the forward direction to perform work and spinning freely in the reverse direction.

[0003] The main components of a bicycle ratchet mechanism include a ratchet ring, ratchet teeth, pawls, and an elastic element. The ratchet ring is usually fixed inside the hub, and several ratchet teeth are arranged in the inner ring of the ratchet ring. The pawls are usually pivotally connected to one end face of the sleeve seat in multiple rings and maintain movement within a preset range. An elastic element provides elastic force to each pawl, allowing the pawls to rotate outward to expose their meshing ends, so as to facilitate meshing with the ratchet teeth for transmission.

[0004] Existing bicycle hub ratchet mechanisms can still contact the ratchet teeth even after the pawl and ratchet teeth have separated, which can easily lead to wear on the pawl or ratchet teeth.

[0005] Therefore, a bicycle hub ratchet is needed to solve the above problems. Utility Model Content

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0007] A bicycle hub ratchet includes a hub housing, a shaft, a ratchet gear ring, a gear ring, and a clutch plate;

[0008] The gear ring is rotatably connected to the clutch plate, the hub shell is used to connect to the wheel, and a shaft is pivotally located at the center of the hub shell; a ratchet gear ring is fitted on one side of the hub shell; several one-way teeth are arranged in a ring with a spacing between them on the inner circumference of the ratchet gear ring, and a tooth groove is formed between adjacent one-way teeth.

[0009] A gear is fixedly mounted on one side of the gear ring, and a locking part is provided on the opposite side of the gear ring; the locking part includes at least one locking groove, at least one pawl and at least one elastic element, one end of the pawl is rotatably mounted in the corresponding locking groove, and an elastic element is provided in each locking groove, the elastic element being used to push the other end of the pawl out of the locking groove; the gear is used to connect with the bicycle chain drive.

[0010] The clutch plate is annular, and the gear ring is movably sleeved on the shaft. The clutch plate and the gear ring are fitted together, and the clutch plate is rotatably mounted on the shaft. The clutch plate and the locking part are located inside the ratchet gear ring. A resistance structure is provided between the clutch plate and the gear ring to increase the rotational resistance of the clutch plate. The clutch plate is provided with a return groove, and the return groove is provided with at least one connection port, which connects the inside of the return groove and the inside of the ratchet gear ring. The locking groove is located inside the return groove.

[0011] When the gear rotates in the first direction around the shaft, one end of the pawl passes through the locking groove and the connecting port in sequence and then meshes with the corresponding tooth groove, driving the hub housing to rotate through the gear; when the gear rotates in the second direction around the shaft, the pawl disengages from the corresponding tooth groove due to the rotational resistance of the clutch plate, and the pawl moves into the retraction groove through the obstruction at the edge of the connecting port.

[0012] Preferably, the clutch plate is provided with a synchronization groove, and at least one synchronization block is provided on one side of the synchronization groove. The locking part is provided with a protrusion that is adapted to the synchronization groove. The protrusion is movably received in the synchronization groove. The synchronization block is used to abut against the protrusion when the protrusion rotates to a specific angle, thereby driving the clutch plate and the locking part to rotate synchronously.

[0013] Preferably, the resistance structure includes a rotating ring, several rolling grooves, several rolling balls, and an O-ring spring; the rotating ring is disposed on the shaft.

[0014] Several rolling grooves are arranged in a ring within the synchronization groove, and each rolling ball is rolled within one rolling groove. An O-ring spring is placed within the synchronization groove, and the rolling ball is positioned between the inner ring of the O-ring spring and the outer ring of the rotating ring. The O-ring spring is used to press the rolling ball between the inner ring of the O-ring spring and the outer ring of the rotating ring.

[0015] Preferably, two synchronizing blocks are symmetrically arranged on the clutch plate, and two protrusions adapted to the synchronizing groove are provided on the locking part. When the two protrusions rotate in the synchronizing groove to abut against the corresponding synchronizing block, the locking part drives the clutch plate to rotate synchronously.

[0016] Preferably, a circular groove is provided on the outer periphery of the rotating ring, and the rolling ball is rolled and received in the circular groove, which is connected to the rolling groove.

[0017] Preferably, the axle is rotatably connected to the hub housing via a bearing.

[0018] Preferably, the resistance structure includes three rolling grooves, which are arranged in a ring array within the synchronization groove.

[0019] Preferably, the locking part includes two locking grooves, two pawls, and two elastic elements; the two locking grooves are disposed opposite to each other on the gear ring.

[0020] Preferably, the synchronization groove is a circular groove.

[0021] Preferably, the hub housing is rotatably connected to the axle via bearings.

[0022] Preferably, the elastic element is a metal spring sheet, with one end of the elastic element fixedly disposed in the locking groove and the other end disposed between the locking groove and the pawl.

[0023] Preferably, one end of the pawl is hinged in the locking groove by a pin.

[0024] Preferably, one end of the pawl is provided with a rotating shaft, and a rotating groove is provided in the locking groove. The rotating shaft is rotatably installed in the rotating groove, so that the pawl is hinged in the locking groove.

[0025] Preferably, the ratchet ring is threadedly connected to the hub housing, the outer wall of the ratchet ring is provided with external threads, and the inner wall of the hub housing is provided with internal threads.

[0026] Preferably, the outer periphery of the hub shell is provided with a plurality of spoke holes in a ring array. The spoke holes are used to connect with spokes, and the hub shell is connected to the wheel through the spokes.

[0027] Preferably, a shaft stop is provided at both ends of the shaft located outside the hub housing, and the shaft stop is threadedly connected to the shaft.

[0028] Preferably, the inner ring of the gear ring is fixedly connected to the outer ring of a bearing, the inner ring of which is sleeved on the shaft, and the bearing connected to the gear ring can move axially along the shaft.

[0029] Preferably, the rolling ball is a steel ball.

[0030] Preferably, the resistance structure includes a retaining ring housed in the synchronization groove. The retaining ring is disposed between the O-ring spring and the locking part, and is used to restrict the O-ring spring and the rolling ball within the synchronization groove.

[0031] Due to the adoption of the above technical solution, the technical progress achieved by this utility model compared with the prior art is as follows: This utility model can retract the pawl into the locking groove through the clutch plate, and can also quickly extend the pawl out of the locking groove, which facilitates the connection between the pawl and the tooth groove and can effectively reduce the wear of the pawl and the one-way tooth. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0033] Figure 1 This is a schematic diagram of the structure of the bicycle hub ratchet of this utility model;

[0034] Figure 2 This is a schematic diagram of the gear ring structure of the bicycle hub ratchet of this utility model;

[0035] Figure 3 This is a schematic diagram of the clutch plate of the bicycle hub ratchet of this utility model;

[0036] Figure 4 This is an exploded view of the ratchet hub of the bicycle according to this utility model;

[0037] Figure 5 This is an exploded structural diagram of the bicycle hub ratchet of this utility model.

[0038] Explanation of main component symbols

[0039] Hub shell 11 Axis 12 Ratchet gear 13 Gear 21 Gear Ring 2 Gear 21 Locking slot 22 Spiked Claw 23 Elastic element 24 Recovery slot 31 Connector 311 Locking section 20 Synchronous slot 32 25 protrusions Synchronization block 321 322 Scroll groove Rolling Ball 323 O-shaped spring 324 Spoke hole 110 Axle stop 111 30mm retaining ring Rotating ring 310

[0040] The following detailed description, in conjunction with the accompanying drawings, will further illustrate this utility model. Detailed Implementation

[0041] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the present invention. The terms "first," "second," etc., in the specification, claims, and accompanying drawings of the present invention are used to distinguish different objects and not to describe a particular order. Furthermore, the terms "comprising" and "having," and any variations thereof, are used. For example, a process, method, system, product, or device that comprises a series of steps or units is not limited to the steps or units listed, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or devices.

[0042] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the present invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0043] Please see Figure 1-5This utility model provides a bicycle hub ratchet, including a hub shell 11, a shaft 12, a ratchet gear ring 13, a gear ring 2, and a clutch plate 3;

[0044] The gear ring 2 is rotatably connected to the clutch plate 3. The hub shell 11 is used to connect with the wheel. A shaft 12 is pivotally provided in the center of the hub shell 11. A ratchet gear ring 13 is fitted on one side of the hub shell 11. Several one-way teeth are arranged in a ring with a spacing between them on the inner circumference of the ratchet gear ring 13. A tooth groove is formed between adjacent one-way teeth.

[0045] A gear 21 is fixedly mounted on one side of the gear ring 2, and a locking part 20 is mounted on the opposite side of the gear ring 2. The locking part 20 includes at least one locking groove 22, at least one pawl 23, and at least one elastic element 34. One end of the pawl 23 is rotatably mounted in the corresponding locking groove 22. An elastic element 24 is mounted in each locking groove 22. The elastic element 24 is used to push the other end of the pawl 23 out of the locking groove 22. The gear 21 is used to connect with the chain drive of the bicycle.

[0046] The clutch plate 3 is annular, and the gear ring 2 is movably sleeved on the shaft 12. The clutch plate 3 and the gear ring 2 are configured to cooperate. The clutch plate 3 is rotatably mounted on the shaft 12, and the clutch plate 3 and the locking part 20 are located inside the ratchet gear ring 13. A resistance structure is provided between the clutch plate 3 and the gear ring 2 to increase the rotational resistance of the clutch plate 3. The clutch plate 3 is provided with a return groove 31, and the return groove 31 is provided with at least one connection port 311, which connects the inside of the return groove 31 and the inside of the ratchet gear ring 13. The locking groove 22 is provided inside the return groove 31.

[0047] When gear 21 rotates around axis 12 in the first direction, one end of pawl 23 passes through locking groove 22 and connecting port 311 in sequence and engages with the corresponding tooth groove, driving hub housing 11 to rotate through gear 21; when gear 21 rotates around axis 12 in the second direction, pawl 23 disengages from the corresponding tooth groove due to the rotational resistance of clutch plate 3, and pawl 23 moves into retraction groove 31 through the obstruction of the edge of connecting port 311.

[0048] In one embodiment of the present invention, the clutch plate 3 is provided with a synchronization groove 32, and at least one synchronization block 321 is provided on one side of the synchronization groove 32. The locking part 20 is provided with a protrusion 25 adapted to the synchronization groove 32. The protrusion 25 is movably received in the synchronization groove 32. The synchronization block 321 is used to abut against the protrusion 25 when the protrusion 25 rotates to a specific angle, thereby driving the clutch plate 3 and the locking part 20 to rotate synchronously.

[0049] In one embodiment of this utility model, the resistance structure includes a rotating ring 310, a plurality of rolling grooves 322, a plurality of rolling balls 323 and an O-ring spring 324; the rotating ring 310 is disposed on the shaft 12;

[0050] Several rolling grooves 322 are arranged in a ring within the synchronization groove 32, and each rolling ball 323 is rolled within a rolling groove 322. An O-ring spring 324 is disposed within the synchronization groove 32, and the rolling ball 323 is disposed between the inner ring of the O-ring spring 324 and the outer ring of the rotating ring 310. The O-ring spring 324 is used to press the rolling ball 323 between the inner ring of the O-ring spring 324 and the outer ring of the rotating ring 310, thereby increasing the resistance when the clutch plate 3 rotates.

[0051] When the clutch plate 3 is installed in conjunction with the locking part, the clutch plate 3 is rotatably mounted on the shaft 12 via a bearing. The rotating ring 310 of the clutch plate 3 is rotatably set inside the inner ring of the clutch plate 3 and is fixedly sleeved on the shaft 12. When the locking part is installed with the clutch plate 3, the O-ring spring 324 is located between the locking part and the clutch plate 3. The O-ring spring 324 applies a radial elastic force to the rolling ball 323. This elastic force increases the resistance of the clutch plate 3 rotating around the shaft 12. The force required for the clutch plate 3 to rotate alone is greater than the resistance required for the gear ring 2 to rotate alone. At the same time, the resistance of the pawl 23 retracting into the retraction groove 31 is also less than the resistance required for the clutch plate 3 to rotate alone. This makes it easier for the pawl 23 to disengage from the corresponding tooth groove through the rotational resistance of the clutch plate 3 and move into the retraction groove 31 through the obstruction of the retraction groove 31.

[0052] By engaging the protrusion 25 with the synchronizing groove 32, the locking part contacts the synchronizing block 321 when rotating, which can drive the clutch plate 3 to rotate together.

[0053] In one embodiment of this utility model, two synchronizing blocks 321 are symmetrically arranged on the clutch plate 3, and two protrusions 25 adapted to the synchronizing groove 32 are provided on the locking part. When the two protrusions rotate in the synchronizing groove 32 to abut against the corresponding synchronizing block 321, the locking part drives the clutch plate 3 to rotate synchronously.

[0054] In one embodiment of this utility model, a circular groove 301 is provided on the outer periphery of the rotating ring 310, and the rolling ball 323 is rolled and received in the circular groove 301. The circular groove 301 is connected to the rolling groove 322. The O-ring spring 324 presses the rolling ball 323 between the circular groove 301 and the inner wall of the O-ring spring 324.

[0055] In one embodiment of this utility model, the shaft 12 is rotatably connected to the hub housing 11 via a bearing.

[0056] In one embodiment of the present invention, the resistance structure includes three rolling grooves 322, which are arranged in a ring array within the synchronization groove 32.

[0057] In one embodiment of the present invention, the locking part 20 includes two locking grooves 22, two pawls 23 and two elastic elements 34; the two locking grooves 22 are disposed opposite to each other on the gear ring 2.

[0058] In one embodiment of this utility model, the synchronization groove 32 is a circular groove.

[0059] In one embodiment of this utility model, the clutch plate 3 is rotatably mounted on the shaft 12 via a bearing. A hole is provided at the center of the clutch plate 3, and the outer ring of the bearing is fixedly connected to the inner wall of the hole at the center of the clutch plate 3.

[0060] In one embodiment of this utility model, the hub shell 11 is rotatably connected to the shaft 12 via a bearing.

[0061] In one embodiment of this utility model, the elastic element 24 is a metal spring sheet. One end of the elastic element 24 is fixedly disposed in the locking groove 22, and the other end is disposed between the locking groove 22 and the pawl 23. Through the elastic force provided by the metal spring sheet, the pawl 23 can extend from the connection port 311 of the retraction groove 31 and engage with the tooth groove.

[0062] In one embodiment of the present invention, one end of the pawl 23 is hinged in the locking groove 22 by a pin.

[0063] In one embodiment of the present invention, one end of the pawl 23 is provided with a rotating shaft, and a rotating groove is provided in the locking groove 22. The rotating shaft is rotatably installed in the rotating groove, so that the pawl 23 is hinged in the locking groove 22.

[0064] In one embodiment of this utility model, the ratchet ring 13 is threadedly connected to the hub housing 11, the outer wall of the ratchet ring 13 is provided with external threads, and the inner wall of the hub housing 11 is provided with internal threads.

[0065] In one embodiment of the present invention, the outer periphery of the hub shell 11 is provided with a plurality of spoke holes 110 in an annular array. The spoke holes 110 are used to connect with spokes, and the hub shell 11 is connected to the wheel through the spokes.

[0066] In one embodiment of this utility model, a shaft stop 111 is provided at both ends of the shaft 12 located outside the hub housing 11. The shaft stop 111 is threadedly connected to the shaft 12. By tightening the corresponding shaft stop 111, the O-ring spring 324 is pressed between the clutch plate 3 and the locking part, preventing the rolling ball 323 from coming out between the O-ring spring 324 and the rotating ring 310.

[0067] In one embodiment of the present invention, the inner ring of the gear ring 2 is fixedly connected to the outer ring of a bearing, the inner ring of the bearing is sleeved on the shaft 12, and the bearing connected to the gear ring 2 can move axially along the shaft 12.

[0068] In one embodiment of this utility model, the rolling ball 323 is a steel ball.

[0069] In one embodiment of the present invention, the resistance structure further includes a retaining ring 30, which is housed in the synchronization groove 32. The retaining ring 30 is disposed between the O-ring spring 324 and the locking part 20. The retaining ring 30 is used to restrict the O-ring spring 324 and the rolling ball 323 in the synchronization groove 32, and prevent the rolling ball 323 from coming out from between the O-ring spring 324 and the rotating ring 310.

[0070] The present invention has been described in detail above. However, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, any modifications or improvements that do not depart from the spirit of the present invention are within the protection scope of the present invention.

Claims

1. A bicycle hub ratchet, characterized in that: Includes hub housing, axle, ratchet ring gear, gear ring, and clutch disc; The gear ring is rotatably connected to the clutch plate, the hub shell is used to connect to the wheel, and a shaft is pivotally located at the center of the hub shell; a ratchet gear ring is fitted on one side of the hub shell; several one-way teeth are arranged in a ring with a spacing between them on the inner circumference of the ratchet gear ring, and a tooth groove is formed between adjacent one-way teeth. A gear is fixedly mounted on one side of the gear ring, and a locking part is provided on the opposite side of the gear ring; the locking part includes at least one locking groove, at least one pawl and at least one elastic element, one end of the pawl is rotatably mounted in the corresponding locking groove, and an elastic element is provided in each locking groove, the elastic element being used to push the other end of the pawl out of the locking groove; the gear is used to connect with the bicycle chain drive. The clutch plate is annular, and the gear ring is movably sleeved on the shaft. The clutch plate and the gear ring are fitted together, and the clutch plate is rotatably mounted on the shaft. The clutch plate and the locking part are located inside the ratchet gear ring. A resistance structure is provided between the clutch plate and the gear ring to increase the rotational resistance of the clutch plate. The clutch plate is provided with a return groove, and the return groove is provided with at least one connection port, which connects the inside of the return groove and the inside of the ratchet gear ring. The locking groove is located inside the return groove. When the gear rotates in the first direction around the shaft, one end of the pawl passes through the locking groove and the connecting port in sequence and then meshes with the corresponding tooth groove, driving the hub housing to rotate through the gear; when the gear rotates in the second direction around the shaft, the pawl disengages from the corresponding tooth groove due to the rotational resistance of the clutch plate, and the pawl moves into the retraction groove through the obstruction at the edge of the connecting port.

2. The bicycle hub ratchet as described in claim 1, characterized in that: The clutch plate is provided with a synchronization groove, and at least one synchronization block is provided on one side of the synchronization groove. The locking part is provided with a protrusion that is adapted to the synchronization groove. The protrusion is movably housed in the synchronization groove. The synchronization block is used to abut against the protrusion when the protrusion rotates to a specific angle, thereby driving the clutch plate and the locking part to rotate synchronously.

3. The bicycle hub ratchet as described in claim 2, characterized in that: The resistance structure includes a rotating ring, several rolling grooves, several rolling balls, and an O-ring spring; the rotating ring is mounted on the shaft. Several rolling grooves are arranged in a ring within the synchronization groove, and each rolling ball is rolled within one rolling groove. An O-ring spring is placed within the synchronization groove, and the rolling ball is positioned between the inner ring of the O-ring spring and the outer ring of the rotating ring. The O-ring spring is used to press the rolling ball between the inner ring of the O-ring spring and the outer ring of the rotating ring.

4. The bicycle hub ratchet as described in claim 3, characterized in that: A circular groove is provided on the outer circumference of the rotating ring, and the rolling ball is rolled and contained in the circular groove. The circular groove is connected to the rolling groove.

5. The bicycle hub ratchet of claim 2, wherein: Two synchronizing blocks are symmetrically arranged on the clutch plate, and two protrusions that are adapted to the synchronizing groove are provided on the locking part. When the two protrusions rotate in the synchronizing groove until they abut against the corresponding synchronizing blocks, the locking part drives the clutch plate to rotate synchronously.

6. The bicycle hub ratchet of claim 3, wherein: The resistance structure includes three rolling grooves and three rolling balls. The three rolling grooves are arranged in a ring array within the synchronization groove.

7. The bicycle hub ratchet of claim 1, wherein: The locking part includes two locking grooves, two pawls, and two elastic elements; the two locking grooves are arranged opposite to each other on the gear ring.

8. The bicycle hub ratchet of claim 1, wherein: The elastic element is a metal spring sheet, with one end fixedly installed in the locking groove and the other end located between the locking groove and the pawl.

9. The bicycle hub ratchet of claim 1, wherein: The axle is located at both ends of the hub housing, and the axle stops are threadedly connected to the axle.

10. The bicycle hub ratchet of claim 3, wherein: The resistance structure includes a retaining ring housed in a synchronizing groove. The retaining ring is positioned between the O-ring spring and the locking part, and is used to restrict the O-ring spring and the rolling ball within the synchronizing groove.

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