CN102049967A - Normally closed type bicycle rear hub structure - Google Patents

Abstract

The invention discloses a normally closed bicycle rear hub structure, which comprises: the ratchet wheel is sleeved on the annular periphery of the ratchet seat and is concavely provided with a plurality of control grooves, a ratchet piece is sleeved on the ratchet seat and is provided with a containing chamber corresponding to the control grooves, the containing chamber is internally pivoted with ratchets and rolling pieces, the rolling pieces are limited between the control grooves and the ratchets, the ratchet piece is convexly provided with a convex block in the axial direction, a damping piece is combined with the convex block of the ratchet piece by an inwards concave clamping groove, a hub shell is provided with a containing space, the ratchet piece and the damping piece are sleeved and covered by the containing space, an inclined gear ring is combined in the containing space, the inclined gear ring is arranged at the outer end of the ratchets and can be meshed, and by the structure, the rolling pieces can be matched with the control grooves in a rolling mode to generate an outwards propping effect, so that the rotary swing action of the ratchets is smoother, the abrasion caused by use is reduced, and the durability of the ratchet wheel is improved.

Description

Normally closed bicycle rear hub structure

technical field

The invention relates to a flower hub structure applied to bicycles, especially to a normally closed bicycle rear hub structure, in which a ratchet part has a rolling part embedded in a through hole, and the rotation position generated by the tooth disc sleeve and the ratchet part Poor, so that the rolling parts can cooperate with the control groove in a rolling manner to produce an outward propping effect, through this, the ratchet can rotate more smoothly, reduce wear and tear caused by use, and increase its durability.

Background technique

The flower hub ratchet structure on the existing bicycle, as shown in Figure 8 and Figure 9, includes: a chainring seat 50 is protrudingly provided with a plurality of control blocks 51 at the end surface, and these control blocks 51 are all inside Concave is formed with interlocking groove 52, and a ratchet piece 60 comprises ratchet seat 61, ratchet 62 and elastic member 63, and ratchet seat 61 is provided with a plurality of ratchet grooves 611 on the outer wall surface, and ratchet groove 611 content A ratchet 62 is provided, and the interlocking column 621 protruding from the ratchet 62 is slidably arranged in the interlocking groove 52, and the outer wall of the ratchet seat 61 and the outer surface of the ratchet 62 are all wound around the through hole 64. The ring shape is provided with a tightening ring groove 65, and an elastic member 63 is sleeved in the tightening ring groove 65, and a stop ring 70 is provided with a positioning groove 71, and the positioning groove 71 and the positioning block 612 of the ratchet seat 61 fit to form a synchronous shape, and the stop ring 70 is provided with a damper 73 at the perforation 72, and the inner edge of the damper 73 is closely attached to the stop sleeve 74, and a hub shell 80 is locked on the inner wall with helical teeth The ring 81 is annularly arranged on the outer end of the ratchet 62 .

When riding a bicycle and stepping on the pedals, the chainring seat 50 is driven by the chain, and the rotation position difference between the chainring seat 50 and the ratchet member 60 is generated. and push the interlocking column 621 of the ratchet 62 to slide from the inner end to the outer end, thereby forming the interlocking state of the chainring seat 50 and the ratchet member 60, and when stepping on the pedal to reverse, The chainring seat 50 rotates in the opposite direction, and the linkage groove 52 of the chainring seat 50 at the control block 51 also reversely pushes the linkage column 621 of the ratchet 62, so that the linkage column 621 moves from the outer end to the inner end. Sliding means that the ratchet 62 is pushed into the ratchet groove 611, so that the ratchet 62 does not interfere with the helical ring 81 at the end of the hub shell 80, so that when the bicycle is pulled, the pedals will not rotate. effect, and can eliminate the sound caused by the continuous collision between the ratchet 62 and the helical ring 81 at the end of the hub shell 80 .

Looking at the above existing structure in detail, it is not difficult to find that it still has some deficiencies, the main reasons are as follows:

1. The control of the ratchet 62 is generated by the rotational position difference between the tooth disc seat 50 and the ratchet member 60, and the linkage column 621 of the ratchet 62 slides in the linkage groove 52, however, the linkage column 621 produces There is sliding friction, which makes it less smooth to move, and also increases the wear and tear during use, that is, reduces its durability.

2. The stop ring 70 uses the damper 73 built in the perforation 72 to generate rotational resistance. Through this, the position difference between the chainring seat 50 and the ratchet member 60 is generated. Since the damper 73 is a coiled spring, there is no external tension. The lack of average and prone to elastic fatigue, and the resistance cannot be adjusted.

In view of this, the present inventor has been engaged in the manufacture, development and design of related products for many years, aiming at the above-mentioned objectives, after detailed design and careful evaluation, he finally obtained a practical invention.

Contents of the invention

Technical problems to be solved:

In the existing hub ratchet structure, the control of the ratchet is generated by the rotation difference between the tooth disc seat and the ratchet part, and the sliding of the linkage column of the ratchet in the linkage groove is used. However, the linkage column produces There is sliding friction, which makes it less smooth to move, and also increases the wear and tear during use, that is, reduces its durability. This is a technical problem to be solved.

Technical features to solve the problem:

A normally closed bicycle rear hub structure, which includes: a chainring cover, a ratchet part, a damping part and a hub shell, and a chainring cover can be connected with the chainring (not shown in the figure) ) is integrally formed in the shape of a single toothed disk, or the toothed disk sleeve is axially provided with multiple toothed disk grooves on the annular surface, and the toothed disk grooves are used to cover multiple toothed disks, and form the toothed disk sleeve and the toothed disk Synchronization of the disks, the toothed disk sleeve is provided with a mandrel, and a ratchet seat is extended to one side. There is a reinforcing sleeve at the center, the reinforcing sleeve is provided with the same groove as the control groove, and has a higher material hardness than the ratchet seat, and there is a There are a plurality of protrusions, and a plurality of depressions are separated by the protrusions. A ratchet piece is sleeved on the ratchet seat, and a plurality of accommodating chambers are opened corresponding to the control grooves. Teeth, and a pivot hole is formed at the bottom of the accommodation chamber, and the ratchet cooperates with the pivot hole to form a shaft, and the ratchet swings around the shaft as the axis, and is located in the accommodation chamber. There is a through hole, the through hole accommodates the rolling element, and the rolling element is limited between the control groove and the ratchet, wherein, the ratchet element protrudes to the concave part of the toothed disc sleeve and is provided with an equal amount of limit block , and the limit block is limited by the protrusion to control the rotation range of the ratchet, and the ratchet is also provided with an equal amount of limit posts protruding from the recess, and the limit posts can also be restricted by the protrusions. It can control the rotation range of the ratchet part. In addition, the outer wall of the ratchet part and the outer surface of the ratchet are cut with a tightening ring groove, and an elastic ring is arranged in the tightening ring groove to make the ratchet move toward the ratchet. The accommodating chamber is in the shape of tightening and limiting, and the elastic ring is formed with a notch, and one end edge of the notch is formed with an inwardly bent fixing part, and the fixing part is matched by a ratchet piece pierced in the groove of the tightening ring. The fixing hole is used to fix the elastic ring, and the ratchet part is provided with a protrusion in the axial direction, and the concave groove of the damping part is combined with the protrusion of the ratchet part, and the damping part is covered with a Sleeve, and the sleeve is slipped on the mandrel. The two ends of the sleeve are in contact with the bearing at the end of the toothed disk sleeve and the bearing at the end of the hub shell, and the positioning of the distance between the toothed disk sleeve and the hub shell is formed by the sleeve. , and the damping member is provided with a plurality of perforations towards the end of the sleeve, and steel balls and elastic members are arranged in the perforations, and then a lock bolt is locked on the outer end of the perforation, so that the steel balls are pressed against the sleeve to form the damping member. Rotational resistance, a hub shell forms an accommodating space, and covers the ratchet and the damper with the accommodating space, and a helical ring is combined in the accommodating space, and the helical ring is arranged on the ratchet The outer end is tooth-engageable. To sum up the above-mentioned structure, the ratchet is limited by the rolling element and the damping element in the accommodation chamber, and achieves the opening and closing action through the resistance of the damping element, and can It can be in the closed state under normal conditions, which can make it have the effect of silent linkage.

The present invention contrasts the effect of prior art:

1. The ratchet part has a rolling part built into the through hole, and through the rotation position difference between the gear plate sleeve and the ratchet part, the rolling part can cooperate with the control groove in a rolling manner to produce the effect of pushing outward. Through this Make the ratchet swing more smoothly, and reduce the wear caused by use, so as to increase its durability.

2. The damping part is equipped with multiple steel balls and elastic parts inside the perforation, and the steel balls are pushed and supported by the tension of the elastic parts, so that the steel balls are directly pressed against the sleeve, and the rotation resistance of the damping part is generated through this, and the elasticity The tension of the part is adjusted by the screw state of the lock bolt to increase the stability of the damping part.

Description of drawings

Fig. 1: is the three-dimensional combination figure of the present invention;

Fig. 2: is the three-dimensional exploded view of the present invention;

Fig. 3: is the side partial sectional view of the present invention;

Fig. 4: is the three-dimensional schematic diagram of the sprocket seat of the present invention in the forward rotation state;

Fig. 5: be the positive rotation action diagram of the present invention in A-A section;

Fig. 6: is the three-dimensional schematic view of the toothed disc seat of the present invention in a reversed state;

Fig. 7: be the reversal motion figure of A-A section of the present invention;

Figure 8: It is an existing three-dimensional exploded view;

Figure 9: It is a schematic cross-sectional view of the existing one.

[Description of main component symbols]

Part of the invention:

Bearing ----- 101, 102

Sprocket set----10 Sprocket slot----11

Mandrel -----12 Ratchet seat----13

Control slot----131 Protrusion----14

Depression ---- 15

Ratchet ---- 20 Storage room ---- 21

Pivot hole----211 Through hole-----212

Ratchet ----- 22 Shaft ----- 221

Limiting column ---- 222 Rolling parts ---- 23

Limiting block----24 Tightening ring groove---25, 223

Fixing hole ---- 251 Elastic ring ---- 26

Fixed part----261 bump-----27

Damping part----30 card slot-----31

Sleeve-----32 Perforation-----33

Steel ball-----34 Elastic piece----35

Lock bolt ----- 36

Hub shell----40 Accommodating space---41

Helical ring ---- 42

Existing section:

Chainring seat----50 Control block----51

Linkage slot ---- 52

Ratchet ---- 60 Ratchet seat ---- 61

Ratchet groove----611 Ratchet-----62

Linkage column----621 Elastic part----63

Through hole -----64 Tightening ring groove---65

Stop ring----70 Positioning groove----71

Perforation-----72 Damping piece----73

Stop sleeve ---- 74

Hub shell----80 Helical gear ring----81

Detailed ways

In order to have a further understanding and understanding of the purpose, features and effects of the present invention, please cooperate with the [simplified description of the drawings] to describe in detail as follows:

First, please view it as shown in Fig. 1, Fig. 2 and Fig. 3, a kind of normally closed bicycle rear flower hub structure, which includes: a chainring cover 10, a ratchet part 20, a damping part 30 and a flower hub structure. The hub shell 40 is combined, and a toothed disc cover 10 can be integrally formed with the toothed disc (not shown in the figure) and has a single toothed disc shape, or the toothed disc cover 10 is axially provided with multiple toothed discs on the annular surface Slot 11, and the tooth plate groove 11 is used to set a plurality of tooth plates, and form the synchronization between the tooth plate sleeve 10 and the tooth plate. Seat 13, the annular peripheral place of this ratchet seat 13 is recessed with a plurality of control grooves 131, and this ratchet seat 13 is sheathed with reinforcing sleeve (not shown in the figure) on the outer surface place, and this reinforcing sleeve is recessed It has the same groove as the control groove 131, and has a higher material hardness than the ratchet seat 13, and a plurality of protrusions 14 are arranged between the chainring cover 10 and the ratchet seat 13, and the protrusions 14 has a plurality of recesses 15 at intervals, a ratchet member 20 is sleeved on the ratchet seat 13, and a plurality of accommodation chambers 21 are provided corresponding to the control groove 131, and ratchets 22 are pivotally arranged in the accommodation chambers 21 , and a pivot hole 211 is enlarged and formed at the bottom end of the accommodating chamber 21, and the ratchet 22 cooperates with the pivot hole 211 to form a shaft portion 221, and the ratchet 22 is in a swivel state with the shaft portion 221 as the axis. A through hole 212 is penetrated at the accommodating chamber 21, and the rolling member 23 is accommodated at the through hole 212, and the rolling member 23 is limited between the control groove 131 and the ratchet 22, wherein the ratchet member 20 faces toward the tooth. The recessed portion 15 of the disc sleeve 10 is protrudingly provided with an equal amount of limit blocks 24, and the limit blocks 24 are limited by the protruding portion 14 to control the rotation range of the ratchet member 20, and the ratchet 22 also protrudes toward the recessed portion 15. Equivalent limit posts 222 are provided, and the limit posts 222 can also be limited by the protrusion 14 to control the rotation range of the ratchet part 20. In addition, the outer wall surface of the ratchet part 20 and the ratchet 22 Tightening ring grooves 25, 223 are cut on the outer surface, and an elastic ring 26 is arranged in the tightening ring grooves 25, 223, so that the ratchet 22 is tightened and limited to the accommodation chamber 21, and the elastic ring 26 is formed with a gap, and an inwardly bent fixing portion 261 is formed at one end edge of the gap, and the fixing portion 261 is provided with a fixing hole 251 provided by the ratchet member 20 in the tightening ring groove 25, through which the fixing portion 261 is fixed. The elastic ring 26, and the ratchet part 20 is axially protrudingly provided with a lug 27, and a recessed draw-in groove 31 within the damping part 30 forms a combination with the protruding block 27 of the ratchet part 20, and the damping part 30 is provided with a Sleeve 32, and the sleeve 32 is slipped on the mandrel 12. The two ends of the sleeve 32 are respectively in contact with the bearing 101 at the end of the toothed disk sleeve 10 and the bearing 102 at the end of the hub shell 40, and the toothed disk is formed by the sleeve 32. The positioning of the distance between the sleeve 10 and the hub shell 40, and the damping member 30 is provided with a plurality of perforations 33 toward the end of the sleeve 32, and steel balls 34 and elastic members 35 are arranged in the perforations 33, and a lock bolt 36 The lock is arranged on the outer end of the perforation 33, so that the steel ball 34 is pressed against the sleeve 32 to form a rotation resistance of the damping member 30. Force, a hub shell 40 forms an accommodating space 41, and the ratchet member 20 and the damping member 30 are covered with the accommodating space 41, and a helical gear ring 42 is combined in the accommodating space 41, and the helical teeth The ring 42 is arranged on the outer end of the ratchet 22 to be tooth-engageable. Based on the above-mentioned structure, the ratchet 22 is limited by the rolling element 23 and the damping element 30 in the accommodation chamber 21, and passes through the damping element. 30 resistance to achieve the action of opening and closing, and can maintain the closed state under normal conditions, which can make it have the effect of silent linkage.

The combination of its structure, please observe from Fig. 2 and Fig. 3 again, its ratchet part 20 is sleeved on the ratchet seat 13 of the chainring cover 10, and is aligned with the control groove 131 by the accommodating chamber 21 At the outer end, the rolling element 23 is arranged in the through hole 212, so that the rolling element 23 sinks into the control groove 131, and the ratchet 22 is inserted from the side of the accommodating chamber 21, and the ratchet 22 is accommodated through the pivot hole 211 shaft portion 221, and the elastic ring 26 is sleeved in the tightening ring grooves 25, 223 formed by the ratchet member 20 and the ratchet 22, thereby preventing the ratchet 22 from moving sideways, and the damping member 30 is sleeved in a At the sleeve 32, steel ball 34 and elastic member 35 are inserted in sequence at the perforation 33, and the elastic member 35 is tightened by locking the lock bolt 36, so that the steel ball 34 is pressed against the sleeve 32 to generate appropriate resistance , and then the sleeve 32 is sleeved on the mandrel 12 to be rotatable, and at the same time, the slot 31 of the damping member 30 is combined with the protrusion 27 of the ratchet member 20 for positioning, that is, the synchronous state of the damping member 30 and the ratchet member 20 is formed. In addition, the hub shell 40 is inserted into the ratchet seat 13 end of the sprocket cover 10 with the accommodation space 41 end, and the damping element 30 and the ratchet element 20 are covered with the accommodation space 41. At this time, the hub shell 40 The helical gear ring 42 surrounds the periphery of the ratchet part 20 and can engage and interlock with the ratchet 22, and the sleeve 32 is pressed by the bearing 101102 at the end of the ring sleeve 10 and the end of the hub shell 40, That is to form a position-limiting effect between the gear plate sleeve 10 and the hub shell 40 .

For its actual operation, please refer to Fig. 3, Fig. 4, Fig. 5 in conjunction with Fig. 2. It is mainly arranged at the rear wheel of the bicycle. , the sprocket can be driven by the chain linked by the bicycle pedal end, and the spindle 12 is fixed with the vehicle frame, and the other hub shell 40 is used to connect the rear wheel of the bicycle. When the bicycle is not in use, the spine Teeth 22 are bounded by elastic ring 26 to be limited in accommodating groove 21, and then damping member 30 is used to block the outside of ratchet member 20, which can prevent ratchet 22 from moving left and right, and rolling member 23 accommodates In the control groove 131 of the ratchet seat 13, and through the contraction state of the ratchet 22, the ratchet 22 does not interfere with the helical ring 42 of the hub shell 40, and when riding a bicycle and stepping on the pedal, Its chainring cover 10 is driven by the chain, and when the toothing cover 10 rotates, its ratchet part 20 generates an interlocking relationship with the damping part 30 through the protrusion 27, and is affected by the resistance of the damping part 30, so that it does not change. It is easy to be rotated, through which the rotation position difference between the tooth disc sleeve 10 and the ratchet member 20 is generated. At this time, the control groove 131 of the ratchet seat 13 rotates in the axial direction, and pushes the rolling member 23 at the bottom end of the ratchet 22. At this time The rolling member 23 breaks away from the control groove 131 in a rolling manner, thereby producing the effect of ejecting the ratchet 22, and the ratchet 22 pivots toward the outer end of the accommodation chamber 21 with the shaft portion 221 as the axis, so that the ratchet 22 can be aligned with the oblique The gear ring 42 is meshed, through which the interlocking state of the gear sleeve 10 and the ratchet member 20 is formed. At the same time, when the ratchet 22 is deflected to the outside of the accommodation chamber 21, the ratchet 22 will be against the outer ring. The helical gear ring 42, and through the helical gear ring 42, drives the hub shell 40 to rotate, that is, to drive the rear wheel of the bicycle to rotate, and when stepping on the pedal to reverse, please refer to Figure 6 and Figure 7 As shown, the chainring cover 10 rotates in the opposite direction, and the control groove 131 of the toothed plate cover 10 at the ratchet seat 13 also rotates in the reverse direction. At this time, the rolling element 23 is affected by the rotation position difference between the ratchet seat 13 and the ratchet element 20 and falls into the control groove 131. At this time, the ratchet 22 is not affected by the outer top of the rolling element 23, and the helical tooth The ring 42 pushes the ratchet 22 into the accommodating chamber 21 in the reverse direction, so that the ratchet 22 does not collide with the helical ring 42 at the end of the hub shell 40, thereby eliminating the friction between the ratchet 22 and the helical ring 42 due to continuous collisions. The sound produced can prevent excessive collision and cause structural damage. Moreover, if the rear wheel end drives the hub shell 40 to rotate, the ratchet 22 is pushed by the helical gear ring 42 and cooperates with the damping member 30 The resistance generated by the end makes the ratchet 22 stably closed in the accommodation chamber 21, that is, the ratchet 22 and the helical ring 42 can be kept in a normally open shape, so the hub shell 40 does not rotate forward or backward. It will drive the ratchet part 20, and the ratchet part 20 can achieve the effect of limiting the rotation angle through the limit block 24 and the limit post 222 corresponding to the protruding part 14 of the toothed disc sleeve 10, so that the rolling part 23 can only be controlled The appropriate position of the groove 131 rolls, thereby increasing the stability of its interlocking state , in summary, when the bicycle is pulled, the effect that its pedals will not rotate can be obtained, and the silent effect can be achieved through this, so as to improve the practicality.

By the structure of above-mentioned specific embodiment, can obtain following benefit:

1. The ratchet part 20 is embedded with a rolling part 23 in the through hole 212, and the rolling part 23 can cooperate with the control groove 131 in a rolling manner to produce an outward movement through the rotation position difference between the tooth disc cover 10 and the ratchet part 20. The effect of the support, through which the ratchet 22 can rotate more smoothly, and reduce the wear and tear caused by use, so as to increase its durability;

2. The damping part 30 is equipped with a plurality of steel balls 34 and elastic parts 35 inside the perforation 33, and the steel balls 34 are pushed and supported by the tension of the elastic parts 35, so that the steel balls 34 are directly pressed against the sleeve 32, thereby generating damping The rotation resistance of the member 30 and the tension of the elastic member 35 are adjusted by the screw state of the locking bolt 36 to increase the stability of the damping member 30 .

To sum up, the present invention has indeed achieved a breakthrough structural design, has improved invention content, and at the same time can achieve industrial applicability and advancement, and the present invention has not been seen in any publications, and it is also novel. Comply with the provisions of the relevant provisions of the Patent Law, and file an application for a patent for invention in accordance with the law.

The above is only a preferred embodiment of the present invention, and should not limit the scope of the present invention; that is, all equivalent changes and modifications made according to the patent scope of the present invention should still be covered by the patent of the present invention In the range.

Claims (10)

1. A kind of normally closed bicycle rear flower hub structure is characterized in that comprising: A toothed disc cover, the toothed disc cover is slidably provided with a mandrel, and a ratchet seat is extended to one end, and a plurality of control grooves are recessed at the annular periphery of the ratchet seat; A ratchet piece, the ratchet piece is sheathed on the ratchet seat, and a plurality of accommodation chambers are opened corresponding to the control groove. The ratchets are pivotally arranged in the accommodation chambers, and there are through holes in the accommodation chambers. A hole, the through hole accommodates a rolling element, and the rolling element is limited between the control groove and the ratchet, and the ratchet is provided with a protrusion in the axial direction; A damping part, the damping part is combined with the protrusion of the ratchet part with the concave slot, and the damping part is covered with a sleeve, and the sleeve is slid on the mandrel, and the damping part faces the sleeve The end is provided with a plurality of perforations, and steel balls and elastic members are arranged in the perforations, and then a lock bolt is locked on the outer end of the perforation, so that the steel balls are pressed against the sleeve to form the rotation resistance of the damping member; and A hub shell, the hub shell forms an accommodating space, and uses the accommodating space to cover the ratchet member and the damping member, and a helical gear ring is combined in the accommodating space, and the helical gear ring is arranged on the ratchet The outer ends of the teeth are toothable. 2. The normally closed bicycle rear hub structure according to claim 1, characterized in that, the ring-shaped surface of the toothed disc sleeve is provided with a plurality of toothed disc grooves in the axial direction, and the plurality of toothed disc grooves are used for To set a plurality of toothed discs, and form the synchronization between the toothed disc sleeve and the toothed disc. 3. The normally closed bicycle rear hub structure according to claim 1, characterized in that, the toothed disc cover and the toothed disc are integrally formed in the shape of a single toothed disc. 4. The normally closed bicycle rear hub structure according to claim 1, characterized in that, a plurality of protrusions are provided between the chainring sleeve and the ratchet seat, and a plurality of depressions are separated by protrusions In addition, the ratchet part protrudes to the concave part with an equal amount of limit blocks, and the limit blocks are limited by the protruding part to control the rotation range of the ratchet part. 5. The normally closed bicycle rear hub structure according to claim 1, characterized in that, a plurality of protruding parts are provided between the tooth disc cover and the ratchet seat, and a plurality of recessed parts are separated by the protruding parts , the other ratchet protrudes toward the concave portion with an equal amount of limit columns, and the limit columns are limited by the protrusions to control the rotation range of the ratchet member. 6. The normally closed rear hub structure of a bicycle according to claim 1, wherein the ratchet member expands to form a pivot hole at the bottom end of the accommodating chamber, and the ratchet is formed by matching the pivot hole There is a shaft, and the ratchet swings around the shaft as the axis. 7. The normally closed bicycle rear hub structure according to claim 1, characterized in that, the outer wall of the ratchet part and the outer surface of the ratchet are provided with tightening ring grooves, and The content of the tight ring groove is provided with an elastic ring, so that the ratchets are tightened and limited to the accommodating chamber. 8. The normally closed bicycle rear hub structure according to claim 7, wherein the elastic ring is formed with a notch, and an inwardly bent fixing portion is formed at one end edge of the notch, and the fixing portion is formed by A fixing hole matched with the ratchet part is pierced in the tightening ring groove, through which the elastic ring is fixed. 9. The normally closed bicycle rear hub structure according to claim 1, characterized in that, the two ends of the sleeve are in contact with the bearing at the sleeve end of the toothed disk and the bearing at the end of the hub shell respectively, and the toothed disk is formed by the sleeve The positioning of the distance between the sleeve and the hub shell. 10. The normally closed bicycle rear hub structure according to claim 1, characterized in that, the ratchet seat is provided with a reinforcing sleeve on the outer surface, and the reinforcing sleeve is provided with the same recess as the control groove. Groove, and has a higher material hardness than the ratchet seat.

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