TW201325938A - Bicycle hub structure - Google Patents

Abstract

A bicycle hub structure comprises: a plurality of pawls, a plurality of elastic elements, a hub, and a chain wheel seat. Each pawl comprises a pivoting end and a toothed end having a pawl tooth. Each elastic element has an end abutting against the toothed end of the pawl. The hub has a bore and a central axle extending through the bore. A circumference of the bore at one side of the hub is extended outward to form an outer circumferential surface. The outer circumferential surface is provided circumferentially with a plurality of pawl receiving slots for receiving the pawls to fit therein and elastic element receiving slot for receiving the elastic elements to fit therein. Outer end faces on two sides of each pawl receiving slot are each integrally extended to form a stop tab. The chain wheel seat is coaxially sleeved into the central axle of the hub and has one end fixedly provided with a driving ring that has an tooth slots arranged along the inner circumference thereof. The driving ring is sleeved onto the outer circumferential surface extending from one end of the hub. As such, the tooth slots of the driving ring and the teeth of the toothed pawls can securely mate each other to provide smooth rotation, and a hub structure that allows interchange of left-end and right-end driving is also provided.

Description

Bicycle hub structure

The present invention relates to a general bicycle hub, and more particularly, a ratcheting ratchet in the hub structure can be smoothly rotated with the tooth groove of the drive ring, and provides a left and right drive. Change the structure of the hub.

The Patent No. I252815 of the Republic of China is disclosed as an external claw-type ratchet hub (the following components are mainly based on this patent), and includes a spindle unit 10 that is rotatably coupled to the spindle unit. A housing 20 supported by the housing 20, a clutch unit 30 disposed inside the housing 20, and a sprocket seat 40 coupled to one end of the housing 20 by the clutch unit 30. The inner ring surface of the housing 20 has a plurality of receiving grooves 23 recessed in the circumferential direction; the clutch unit 30 has a ratchet ring 31 and a plurality of claws 32, wherein the ratchet ring 31 is sleeved on the ring The spindle unit 10 is connected to the sprocket seat 40, and the outer peripheral surface of the ratchet ring 31 is provided with a plurality of ratchet teeth 311. The cogging system formed between the ratchet teeth 311 and the adjacent ratchet teeth 311 can be seen from the figure. The claws 32 provided in the respective receiving grooves 23 are engaged with the slots of the ratchet ring 31 so as to be recessed in the tangential direction of the ratchet ring 31.

With the above structural composition, when the sprocket seat 40 is rotated in the forward direction (see clockwise direction in the fourth figure of the patent), the claws 32 can be pushed against the respective claws 32 by the slotted groove wall of the ratchet ring 31. The jaws 32 are caused to rotate the housing 20; conversely, when the sprocket seat 40 is rotated in the reverse direction (ie, counterclockwise), the slots of the ratchet ring 31 will not push against the jaws 32 and cause ratchets. Ring 31 produces an idle rotation.

The sprocket seat 40 in the above structure is installed in the direction. In order to match the rider's usage habits, for example, some users are accustomed to attach the sprocket seat 40 to the right side, and some users are accustomed to attach the sprocket seat 40 to the left. In this way, the housing 20 and the ratchet ring 31 must cooperate to change the assembly direction thereof. However, because the slot of the ratchet ring 31 has a certain directivity, if the assembly direction is directly changed, the claws 32 cannot be engaged with the slots of the ratchet ring 31, so that the housing 20 cannot be smoothly rotated, that is, The sprocket seat 40 will cause idling, so it is necessary to make a ratchet ring with a tooth groove in the other direction to cooperate with the user. However, this method not only increases the manufacturing cost but also is not economical, and will also cause use. Inconvenience.

The Republic of China Announcement No. M348027 discloses a type of outer claw-type ratchet flower hub that can be driven by left and right (the following symbols are also mainly used in this patent case), which includes a spindle unit 10 and a rotatable A housing 20 supported by the spindle unit 10, a clutch unit 30 disposed inside the housing 20, and a sprocket seat 40 coupled to one end of the housing 20 by the clutch unit 30. The inner ring surface 221 of the housing 20 has a plurality of accommodating grooves 23 recessed in the circumferential direction. The inner ring surface 221 of the housing 20 is provided with first blocking portions 24 along the two sides of the opening of each accommodating groove 23. The second stopping portion 25, each of the accommodating grooves 23 is formed by a pair of groove bottom surfaces 232 of the inner ring surface 221, respectively connected to the groove bottom surface 232 and opposite to the first limiting arc portion 233 and The first and second stop portions 24 and 25 respectively correspond to the first and second limit arc portions 233 and 234 of the accommodating grooves 23; the clutch unit 30 has an extension of the housing a ratchet ring 31 in the inner hole 21, a plurality of loops 32 disposed outside the ratchet ring 31 and disposed in the accommodating grooves 23, and most of which are mounted in the accommodating grooves 23 and Providing the claws 32 to hold the elastic member 33 that is elastically supported on the ratchet ring 31, wherein the ratchet ring 31 has a plurality of ratchet teeth 311 disposed on an outer peripheral surface, the ratchet teeth 311 having a square cross section; The claws 32 each have a pivotal end portion 321 which is pivotally received in the first limiting arc portion 233, and is opposite to the pivoting end portion 321 and is The ratchet 311 produces a meshing spine a claw portion 322 and a middle portion 323 between the pivot end portion 321 and the pawl portion 322, the pawl portion 322 can abut the first engaging surface 312 to engage with the ratchet 311, and The middle portion 323 has one side that abuts against the first stop portion 24; and the sprocket seat 40 is integrally formed with the ratchet ring 31.

According to the above configuration, as shown in the fourth figure, the patent is used as the right-hand type hub, and when the sprocket seat 40 is driven to rotate in the clockwise direction, the pawl portion 322 is used to resist. On the first clamping surface 312, the ratchet teeth 311 are engaged with the pawl 32 to drive the housing 20 to rotate; otherwise, when the sprocket seat 40 is driven to rotate in the counterclockwise direction, the claws are 32 will trip from the ratchet 311, and with the elastic force of the elastic member 33, the pawl 32 will be released and then re-engaged with the ratchet 311.

As shown in the fifth and sixth figures, the left-hand type of the hub is used. When assembling, the mounting direction of the housing 20 is changed and the left and right positions of the housing 20 are interchanged. The pivoting end portion 321 of the pawl 32 is pivotally disposed in the second limiting arc portion 234, and the elastic members 33 are sleeved in the first limiting arc portion 233, and the pawl portion 322 is resisted The second card face 313 is on the left side of the rider.

After the sprocket seat 40 is driven to rotate counterclockwise by the above-described combination change, the pawl portion 322 can also be used to abut against the second engagement surface 313, and the ratchet teeth 311 and 掣The claws 32 are engaged to interlock the housing 20 to rotate; otherwise, when the sprocket seat 40 is driven to rotate in the clockwise direction, the claws 32 also trip from the ratchet teeth 311, and the elastic members are utilized. The elastic force of 33 causes the pawl 32 to re-engage and then engage the ratchet 311.

The flower hub structure allows the user to change the direction of the housing 20 and cooperate with the first limiting arc portion 233 and the second limit that will provide the pivoting end portion 321 of the pawl 32 and the elastic member 33. The arc portion 234 is used for position exchange, thereby providing a ratchet hub that can be used for left and right drive, but still has the following disadvantages:

1. The housing 20 is provided with a clutch unit 30 disposed therein. When initially manufactured, the housing 20 must be "recessed" from the circumferential wall 22 and the inner annular surface 221 of the end portion of the housing 20, and recessed. a plurality of accommodating grooves 23, a plurality of first stopping portions 24 extending along the inner ring surface 221 to one side of each of the accommodating grooves 23 and an opening 231, and a plurality of circumferentially corresponding portions corresponding to the first stopping portion And a second stopping portion 25 extending on the other side of the opening 231; wherein the receiving grooves 23 must be formed by a pair of groove bottom surfaces 232 of the inner ring surface 221, and a groove bottom surface 232 a first limiting arc portion 233 having a one-side and a circular shape, and a second limiting portion corresponding to the first limiting arc portion 233 in the circumferential direction and engaging on the other side of the bottom surface 232 of the groove and having a circular shape The arc portion 234 can provide the plurality of claws 32 of the clutch unit 30 and the elastic members 33 correspondingly inserted into the receiving grooves 23 of the one end portion of the housing 20, resulting in initial manufacture and assembly. inconvenient.

The ratchet ring 31 of the clutch unit 30 is integrally formed on one side of the sprocket seat 40. The outer peripheral surface of the ratchet ring 31 is provided with a plurality of ratchet teeth 311, since it must be extended to the housing 20 The inner hole 21 is sleeved in a plurality of claws 32 and a plurality of elastic members 33 recessed in the receiving groove 23 provided at one end of the housing 20, and the ring is formed outside the ratchet ring 31, and The pawl portion 322 of the pawl 32 is engaged with the ratchet tooth 311 of the ratchet ring 31. Therefore, the outer diameter of the ratchet ring 31 can be limited in size, so that the spine can be looped on the outer peripheral surface thereof. The number of teeth 311 is relatively limited and is restricted, so that when the sprocket seat 40 is driven, the ratchet ring 31 provided on one side of the sprocket seat 40 is to be synchronized by the ratchet teeth 311 and the claws provided on the outer peripheral surface thereof. When the pawl portion 322 of the engaging portion 322 is engaged and rotated, the rotational torque that can be transmitted is small, which relatively affects the thrust of the pawl portion 322 of the pawl 32 to be further transmitted to the housing 20 for rotation.

3. The outer end faces of the plurality of accommodating grooves 23 recessed from the inner annular surface 221 of the peripheral wall 22 of the one end portion of the casing 20 along the circumferential direction of the recessed manner are completely open without any blocking state. The pawl 32 and the elastic member 33 of the clutch unit 30 are nested therein, and when the ratchet hub is to be converted to the right and left, the pawl 32 and the elastic member 33 are required to be exchanged with each other. The groove 23 is taken out. Therefore, when the outer peripheral surface ring is provided with a plurality of ratchet teeth 311 extending into the inner hole 21 of the housing 20 and meshing with the pawl portions 322 of the claws 32, the sprocket seat 40 is driven, the chain The ratchet ring 31 on the side of the wheel base 40 is synchronously rotated by the ratchet teeth 311 provided on the outer peripheral surface thereof and the pawl portions 322 of the pawl 32. The pawl portions 322 of the pawls 32 are further transmitted to the housing 20 for continuous operation. When rotating, the pivoting end portion 321 of each of the claws 32 will slightly shift in the axial direction of the accommodating groove 23, causing poor arrangement of the force transmitting portion, thereby affecting the pawl portion 322 and the ratchet of the pawl 32. The friction loss of the 311 meshing part and the imbalance and non-smoothness during rotation.

4. When the pawl portion 322 of the pawl 32 is engaged with the ratchet tooth 311, the pawl 32 must be replaced due to friction loss, or the pawl 32 and the elastic member 33 must be relatively opposed due to the ratchet hub being intended to be driven by the left and right drive. For the position exchange, the original sleeves are disposed on the inner surface 221 of the casing 20 and the claws 32 and the elastic members 33 in the plurality of accommodating grooves 23 recessed in the circumferential direction, and the elastic members 33 are used in the claws 32. The elastic force pushes the pawl portion 322 of the pawl 32 to engage with the ratchet tooth 311 of the ratchet ring 31. When the sprocket seat 40 and the housing 20 are further disassembled and separated, the spring 20 will be removed from the housing 20 The outer end faces of the plurality of accommodating grooves 23 recessed by the inner annular surface 221 of the one end peripheral wall 22 are completely open without any blocking structure design, so that the claws 32 and the elastic members 33 are self-accepting grooves in the axial direction. 34 The outer end face is detached and even lost and lost.

The Republic of China Announcement No. I335276 discloses a bicycle hub assembly (the following components are also mainly based on this patent), and includes a hub 2 having a shaft hole 21 coaxially disposed therewith. a spindle 22 of the shaft hole 21, the hub 2 defines an inner annular surface 23 in the shaft hole 21, and the inner annular surface 23 of the hub 2 has a plurality of slots 25, each of the slots 25 along the shaft hole of the hub 2 21 is radially recessed, and each of the slots 25 has a trapezoidal shape; a ratchet 3 is coaxially sleeved on the spindle 22 of the hub 2, and the ratchet 3 has a ring connecting the sprocket seat 31. 33, the ring 33 is disposed in the shaft hole 21 of the hub 2, and the ring 33 corresponds to the inner ring surface 23 of the hub 2, and the ring 33 of the ratchet 3 has a plurality of receiving slots 34; a plurality of pawls 4, each of which has a pivoting end 42 and a toothed end 44. The pivoting end 42 of the pawl 4 is selectively disposed in the recesses 342, 344 of the receiving slot 34. a recessed portion, the tooth end 44 of each of the pawls 4 is embedded in one of the slots 25 and pushed against the slot wall of the slot 25; and a plurality of elastic members 5 each of which is selectively selectable at one end thereof Ground In another portion of the receiving recess groove 34 two recesses 342, 344, and its other end abuts against the end 44 of the pawl teeth 4, 4 for providing the return force of the pawl.

With the above structure, please refer to the fourth figure of the patent. When the shaft hole 21 of the hub 2 faces the right side, and the chain drives the sprocket seat 31 to rotate in the forward direction (ie, clockwise direction), the ratchet wheel 3 will be synchronously driven. The pawl 4 rotates, and the tooth end 44 of the pawl 4 pushes against the groove wall 252 of the tooth groove 25 of the hub 2, so that the hub 2 is synchronously rotated by the thrust of the tooth end 44 of the pawl 4; When the sprocket seat 31 is rotated (ie, counterclockwise), the tooth end 44 of the pawl 4 is pressed against the groove between the adjacent two gullets 25 to leave the gullet 25, so that the ratchet 3 cannot pass through the thorn. The tooth end 44 of the pawl 4 engages with the slot 25 of the hub 2 to cause the hub 2 to rotate and simultaneously idling. When the ratchet 3 stops idling, the elastic members 5 are pushed against the tooth end 44 of the pawl 4 by their own elastic force and can be reinserted into one of the slots 25 of the hub 2.

Referring to the fifth figure of the patent, if the hub 2 is to be changed in direction, and the shaft hole 21 of the hub 2 is oriented to the left, the pawls 4 and the elastic members 5 are respectively exchanged positions, that is, the pawls 4 are Mounted in each recess 344, each elastic member 5 is mounted in each recess 342; and when the ratchet 3 is rotated in the forward direction (ie, counterclockwise), the tooth end 44 of the pawl 4 is pushed against the hub 2 The groove wall 254 on the opposite side of the tooth groove 25 drives the hub 2 to rotate; and when the ratchet wheel 3 rotates in the reverse direction (ie, clockwise direction), the tooth end 44 of the pawl 4 is also passed between the adjacent two tooth grooves 25. The bumps are pressed against the slots 25, so that the ratchets 3 cannot mesh with the slots 25 of the hub 2 through the tooth ends 44 of the pawls 4 to drive the hub 2 to rotate, and at the same time, idle rotation. When the ratchet wheel 3 stops idling, the elastic members 5 are also urged against the tooth end 44 of the pawl 4 by their own elastic force and can be reinserted into one of the slots 25 of the hub 2.

The hub structure can be used by the user to change the direction of the hub 2 and cooperate with the two recesses 342, 344 which provide the pivot end 42 of the pawl 4 and the elastic member 5 to provide a positional exchange. The left and right drive is replaced by a flower hub, but it still has the following disadvantages:

The ratchet 3 is connected to the side of the sprocket seat 31 by the rim 33, and a plurality of accommodating grooves 34 are disposed on the outer peripheral surface of the rim 33, and recesses are provided at the ends of each accommodating groove 34. 342, 344, respectively, a pawl 4 and an elastic member 5 are inserted into the sleeve, and the flange 33 must be inserted into the shaft hole 21 of the hub 2 so as to fit over the outer peripheral surface of the flange 33. The plurality of pawls 4 and the plurality of elastic members 5 in the plurality of accommodating grooves 34 are disposed at the tooth end 44 of each of the pawls 4 when the rim 33 is inserted through the shaft hole 21 of the hub 2 Therefore, the slots 25 which are equally spaced from the inner ring surface 23 of the hub 2 can be engaged. Therefore, the outer diameter of the flange 33 provided on the ratchet wheel 3 is limited, so that the ring is disposed on the outer peripheral surface thereof. The number of the accommodating slots 34 is relatively small, so that the number of the pawls 4 and the elastic members 5 that can be inserted into each of the accommodating slots 34 is relatively limited, and the chain sprocket seat 40 is rotated to make the sleeve The pawl 3 on the side of the sprocket seat 40 and the pawl 4 in the accommodating groove 34 provided on the outer peripheral surface thereof are intended to be engaged by the tooth groove 44 of the hub 2 and the tooth groove 25 provided in the inner ring surface 23 of the hub 2 When the finger is rotated, it can be transmitted The rotational torque is small, the relative impact of the pawl teeth 4 end 44 may be further transmitted to the hub for rotation of the thrust of the two.

The ratchet 3 is connected to the side of the sprocket seat 31 by the rim 33. The outer peripheral surface of the rim 33 is provided with a plurality of accommodating grooves 34, and recesses are provided at both ends of each accommodating groove 34. 342, 344, which respectively provide a pawl 4 and an elastic member 5, but the outer end faces of the plurality of accommodating grooves 34 which are arranged around the outer peripheral surface of the rim 33 are completely open without any blockage. a state in which the pivoting end 42 of the pawl 4 and the elastic member 5 are inserted therein, and when the hub 2 is to be converted to the left and right, the pawl 4 and the elastic member 5 must be exchanged relative to each other. The groove 34 is taken out in the axial direction. Therefore, when the outer peripheral surface of the flange 33 is annularly disposed, the receiving groove 34 is inserted into the shaft hole 21 of the hub 2 in the provision of the pawl 4 and the elastic member 5, and The inner ring surface 23 of the hub 2 is meshed with the equally spaced annular grooves 25, and the chain sprocket base 31 is rotated by the chain, and the flange 33 connected to one side of the sprocket seat 31 is surrounded by the outer peripheral surface thereof. The pawl 4 which is sleeved by the accommodating groove 34 meshes with the tooth groove 25 which is equidistantly spaced from the inner ring surface 23 of the hub 2, and is synchronously rotated. When the tooth end 44 of the pawl 4 is further transmitted to the hub 2 for continuous rotation, each The pivoting end 42 of the pawl 4 will slightly shift in the axial direction of the accommodating hole 34, causing a poor arrangement of the force transmitting portion, thereby affecting the tooth end 44 of the pawl 4 and the inner ring surface 23 of the hub 2, etc. The friction loss at the meshing portion of the ring groove 25 and the imbalance and non-smoothness during the rotation.

3. When the tooth end 44 of the pawl 4 is engaged with the tooth groove 25 equidistantly spaced from the inner ring surface 23 of the hub 2, the pawl 4 must be replaced due to friction loss, or the hub 2 is required to be converted to the left and right. The pawl 4 and the elastic member 5 are exchanged with respect to each other, so that the pawl 4 and the elastic member 5 which are disposed in the outer peripheral surface receiving groove 34 of the rim 33 are pushed by the elastic force of the elastic member 5 at the pawl 4 The tooth end 44 of the rattling pawl 4 is fitted into one of the slots 25 of the hub 2, and when the sprocket seat 31 and the hub 2 are further disassembled and separated, the flange 33 is connected to the side of the sprocket seat 31. The outer end faces of the plurality of accommodating grooves 34 which are disposed on the outer peripheral surface thereof are completely open without any resistance structure design, and the pawls 4 and the elastic members 5 are separated from the outer end faces of the self-accommodating grooves 34 in the axial direction. Even falling and lost.

The present invention has been improved in view of the above-mentioned structural disadvantages. Therefore, the main purpose of the present invention is to provide a bicycle hub structure, comprising at least: a pawl, an elastic member, a hub, and a sprocket seat, wherein the pawl has a pivot end and a spine a tooth end of the tooth; one end of the elastic member can abut against the tooth end of the pawl; the hub has a shaft hole and a mandrel passing through the shaft hole, and a peripheral edge of the shaft hole of the hub is protruded outward An outer ring surface, the outer ring surface is provided with a plurality of pawl receiving grooves for the pivoting end of the pawl and an elastic member receiving groove for the elastic member to be nested, and in each of the pawl receiving grooves The outer end faces of the two sides are integrally extended with a stopper piece; the sprocket seat is coaxially sleeved on the mandrel of the hub, and one side of the inner ring is fixed with a driving ring with a tooth groove, and the driving ring can be sleeved The outer circumference of the torus is protruded on one side of the hub: according to this, the position of the tooth end of the pawl formed between the hub side and the outer end surface of the pawl receiving groove Under the effective limit, the ratchet of the pawl can be rotated smoothly with the larger rotation torque and the tooth groove of the drive ring, and Drum direction, the pawl and the elastic member from the original position of the hub sleeve in the outer surface of the pawl receiving groove and the receiving groove of the elastic member when changing direction, to provide a structure around the drive hub with the interactive exchange.

For the rest, we will continue to provide a review of the structural features and operations of the case in the form of a graphic description.

First, the first drawing is a perspective exploded view of the first embodiment of the bicycle hub structure of the present invention, the second drawing is a combined schematic view of the first drawing, and the third drawing is a combined sectional view of the second drawing, and the fourth drawing is: A cross-sectional view of the line AA in the third figure is used to illustrate the use of a right-hand hub. The bicycle hub structure according to the present invention comprises at least: a plurality of pawls 2, a plurality of elastic members 3, a hub 4, a sprocket seat 5, wherein the plurality of pawls 2, each of the pawls 2 There is a pivot end 21 and a tooth end 22 having a plurality of ratchet teeth 221 thereon.

The elastic member 3 has a top end 31 of each elastic member 3 which can abut against the tooth end 22 of the pawl 2.

The hub 4 has a shaft hole 41 and a spindle 42 passing through the shaft hole 41. One side of the hub 4 has a peripheral edge 43 of the shaft hole 41 and an outer annular surface 44 is protruded outwardly. The outer ring surface 44 A bearing 45 passing through the mandrel 41 is disposed at the center, and the outer ring surface 44 is provided with a plurality of pawl receiving grooves 441 for the pivoting end 21 of the pawl 2 and a bottom end 32 for the elastic member 3. The elastic member accommodating groove 442 is disposed on the outer side of the outer ring surface 44 of the hub 4 on both sides of each of the pawl accommodating grooves 441 and integrally extended to block the piece 4411, and the blocking piece 4411 is provided. A limiting groove 46 is formed between the side 43 of the hub 4 .

The sprocket base 5 is coaxially sleeved on the mandrel 42 of the hub 4, and has a drive ring 51 having a ring groove 511 on one side thereof, and the drive ring 51 is sleeved on the side of the hub 4 The outer circumference of the outer ring surface 44 is protruded, and the tooth groove 511 provided in the inner ring is fitted into the ratchet tooth 221 provided on the tooth end 22 of the pawl 2.

When the group is to be configured as a linkage structure of a right-hand hub, the pivot end 21 of the pawl 2 can be pivoted to the pawl receiving groove 441 which is surrounded by the annular surface 44 of the hub 4 The bottom end 32 of the elastic member 3 is sleeved in the elastic member receiving groove 442 surrounded by the annular surface 44 of the hub 4, and the top end 31 of the elastic member 3 is abutted against the corresponding spine. On the tooth end 22 of the pawl 2, the ratchet teeth 221 of the pawl 2 are urged against the slot 511 of the drive ring 51.

When the sprocket seat 5 is rotated in a clockwise direction by a chain (not shown), the ratchet teeth 221 of the pawl 2 are used to abut against the slots 511 of the drive ring 51, and the ratchet teeth 221 are The tooth groove 511 is engaged to interlock and the hub 4 is rotated. On the contrary, when the sprocket seat 5 is driven to rotate counterclockwise, the ratchet teeth 221 of the pawls 2 will trip from the slots 511 of the drive ring 51, and the elastic force of the elastic member 3 is used to make the spines After the ratchet teeth 221 of the pawl 2 are tripped, they will then remain engaged with the slots 511 of the drive ring 51.

During the period, the pawl receiving groove 441 which is provided by the pivoting end 21 of the pawl 2 and the elastic member receiving groove 442 which is provided with the bottom end 32 of the elastic member 3 are specially provided on the side of the self-made drum 4 43 The outer annular surface 44 is protruded outwardly, so that the outer diameter of the outer annular surface 44 is larger, and a larger number of pawl receiving grooves 441 and elastic member receiving grooves can be looped on the outer annular surface 44. 442, a relatively large number of pawls 2 and elastic members 3 are correspondingly sleeved in the pawl receiving grooves 441 and the elastic member receiving grooves 442, and the inner ring is provided with a driving ring of the ratchet groove 511. 51, which is sleeved on the side of the hub 4, which has a larger outer diameter dimension and has an outer circumference of the toroidal surface 44, so that the tooth groove 511 provided in the inner ring is provided with the ratchet teeth 221 provided at the tooth end 22 of the pawl 2 When the chain is driven to rotate the sprocket seat 5, the inner ring is provided with the tooth groove 511 and is fixed to the drive ring 51 on the side of the sprocket seat 5, and the tooth groove 511 can be set in synchronization with a larger number. The ratchet teeth 221 of the pawl 2 of the outer ring surface 44 of the hub 4 are engaged to provide a smoother support for greater torque transmission and smooth rotation.

Further, the outer side of the outer surface of the outer surface of the outer surface of the outer surface of the hub 4 is formed with a stopper piece 4411, and the side of the blocking piece 4411 and the side of the hub 4 are 43. The limiting groove 46 is formed. Therefore, when the inner ring is provided with the driving ring 5 of the ratchet groove 511, the outer peripheral edge of the annular surface 44 is formed on the side of the hub 4, and the inner ring is provided with the cogging of the inner ring. When the 511 is fitted into the ratcheting teeth 221 of the tooth end 22 of the pawl 2, the outer side of the tooth end 22 of the pawl 2 and the outer side of the top end 31 of the elastic member 3 can be blocked, and the pawl 2 and the elastic member can be blocked. 3 is limited to the position of the limiting groove 46, so when the chain drives the sprocket seat 5 to rotate, the inner ring is provided with the tooth groove 511 and is fixed to the driving ring 51 of the sprocket seat 5 side, and the tooth groove 511 is synchronized and sleeved. When the ratchet teeth 221 of the pawl 2 of the outer ring surface 44 of the hub 4 are engaged for continuous rotation, the pivot end 21 of each pawl 2 is not horizontally displaced in the axial direction, so that the ratchet 2 is ratcheted. The 221 maintains a relatively precise meshing and smooth transmission with the slot 511 of the drive ring 51, and at the same time, reduces the friction loss of the ratchet teeth 221 of the pawl 2 and the tooth groove 511 of the drive ring 51, and extends the parts. Life.

5 is a perspective exploded view of a second embodiment of the bicycle hub structure of the present invention, and a sixth section is a schematic cross-sectional view of the fifth diagram, and the seventh diagram is a cross-sectional view along line BB of the fifth figure for explaining a The left-hand hub is used. The basic configuration of the embodiment is the same as that of the first embodiment, and therefore, the details are not repeated, but the difference is that the structure of the hub of the present invention can be converted into the use form of the left-hand hub, and when it is assembled, the hub 4 is changed. In the mounting direction, the hub 4 and the sprocket seat 5 are disassembled and separated, the left and right positions of the hub 4 are interchanged, and the pivot shaft 21 of the pawl 2 is taken out from the pawl receiving groove 441, and the bottom end 32 of the elastic member 3 is self-contained. The elastic member accommodating groove 442 is taken out, and then the detached pawl 2 is replaced by a direction, and the pawl 2 is again inserted into the original pawl accommodating groove 441 by the pivot shaft 21, and the elastic member 3 to be taken out is removed. After the direction is changed, the bottom end 32 of the elastic member 3 is again inserted into the original elastic member receiving groove 442, and the sprocket seat 5 is located on the left side of the rider.

By the change of the above-described combination, when the sprocket seat 5 is driven to rotate in the counterclockwise direction, the ratchet teeth 221 of the pawl 2 can also be used to abut against the slots 511 of the drive ring 51, and The ratchet teeth 221 are engaged with the slots 511 to interlock the hub 4 to rotate. On the other hand, when the sprocket seat 5 is driven to rotate in the clockwise direction, the ratchet teeth 221 of the pawls 2 are tripped from the slots 511 of the drive ring 51, and the elastic force of the elastic member 3 is utilized to make the spines After the ratchet teeth 221 of the pawl 2 are tripped, they will then remain engaged with the slots 511 of the drive ring 51.

Further, the outer side of the outer surface of the outer surface of the outer surface of the outer surface of the hub 4 is formed with a stopper piece 4411, and the side of the blocking piece 4411 and the side of the hub 4 are 43. The limiting groove 46 is formed. Therefore, when the inner ring is provided with the driving ring 5 of the tooth groove 511, the outer circumference of the annular surface 44 is formed on the side of the hub 4, and the inner ring is provided with the cogging of the inner ring. When the 511 is fitted into the ratchet tooth 221 of the tooth end 22 of the pawl 2, the outer side of the tooth end 22 of the pawl 2 and the outer side of the top end 31 of the elastic member 3 are blocked, and the pawl 2 and the elastic member 3 are further blocked. The position limit groove 46 is limited. Therefore, when the ratchet teeth 221 of the pawl 2 and the tooth groove 511 of the drive ring 51 mesh with each other, the pawl 2 needs to be replaced due to frictional wear for a period of time, or the hub 4 is desired. In the driving direction, the pawl 2 and the elastic member 3 are taken out in one direction, so that the original sleeve is disposed on the pawl receiving groove 441 of the outer ring surface 44 of the hub 4 and the pawl in the elastic member receiving groove 442. 2 and the elastic member 3, in the pawl 2, the ratchet 221 of the pawl 2 is inserted into the slot 511 of the drive ring 51 by the elastic force of the elastic member 3, and the sprocket seat 5 and the hub 4 are further disassembled and separated. action The pawls 2 and the elastic members 3 are not disengaged from the outer end faces of the self-accommodating grooves 34 in the axial direction.

The above is only the preferred embodiment of the present invention, and the scope of the invention is not limited thereto, that is, the simple equivalent changes and modifications made by the scope of the invention and the description of the invention, All remain within the scope of the invention patent.

(2). . . pawl

(twenty one). . . Pivot end

(twenty two). . . Tooth end

(221). . . Ratchet

(3). . . Elastic part

(31). . . top

(32). . . Bottom end

(4). . . Flower drum

(41). . . Shaft hole

(42). . . Mandrel

(43). . . One side

(44). . . Outer torus

(441). . . Pawl receiving groove

(4411). . . Stopper

(442). . . Elastic member receiving groove

(45). . . Bearing

(46). . . Limit slot

(5). . . Sprocket seat

(51). . . Drive ring

(511). . . Cogging

The first figure is a perspective exploded view of the first embodiment of the bicycle hub structure of the present invention.

The second picture is a schematic diagram of the combination of the first picture.

The third figure is a schematic cross-sectional view of the second figure.

Figure 4: A cross-sectional view taken along line A-A in the third figure to illustrate the use of a right-hand hub.

Fig. 5 is a perspective exploded view showing the second embodiment of the bicycle hub structure of the present invention.

Figure 6 is a schematic cross-sectional view of the fifth figure.

Figure 7 is a cross-sectional view taken along line B-B in the fifth figure to illustrate the use of a left-handed hub.

(2). . . pawl

(twenty one). . . Pivot end

(twenty two). . . Tooth end

(221). . . Ratchet

(3). . . Elastic part

(31). . . top

(32). . . Bottom end

(4). . . Flower drum

(42). . . Mandrel

(43). . . One side

(44). . . Outer torus

(441). . . Pawl receiving groove

(4411). . . Stopper

(442). . . Elastic member receiving groove

(45). . . Bearing

(46). . . Limit slot

(5). . . Sprocket seat

(51). . . Drive ring

(511). . . Cogging

Claims (3)

A bicycle hub structure comprising at least: a plurality of pawls, a plurality of elastic members, a hub, a sprocket seat, wherein the plurality of pawls each have a pivot end and a top thereof a ratchet tooth end; the plurality of elastic members, the top end of each elastic member is capable of abutting against the tooth end of the pawl; the hub has a shaft hole and a spindle passing through the shaft hole, An outer ring surface is protruded from the periphery of the shaft hole of one side of the hub, and the outer ring surface is provided with a plurality of pawl receiving grooves for the pivot end of the pawl and elasticity for inserting the bottom end of the elastic member. a accommodating groove is formed on the outer side of the outer ring surface of the hub and is integrally extended with a stopper piece on both sides of each of the pawl accommodating grooves, and a limiting groove is formed between the blocking piece and the side of the hub; The sprocket seat is coaxially sleeved on the mandrel of the hub, and has a driving ring with a tooth groove on one side of the hub, and the driving ring is sleeved on the side of the hub and outside the outer circumference of the torus. The edge is provided with the tooth groove provided in the inner ring and the ratchet provided on the tooth end of the pawl. The bicycle hub structure according to claim 1, wherein the ratchets provided at the tooth ends of the pawls are arranged in several places. The bicycle hub structure according to claim 1, wherein a circumference of the shaft hole of the hub is outwardly protruded from the outer ring surface, and a bearing passing through the spindle is sleeved.