CN102950968A - Driving device for rear hub of bicycle - Google Patents

Abstract

The invention is a driving device of a bicycle rear hub, comprising: the hub shell, a unidirectional driving assembly and a bidirectional driving seat, wherein the unidirectional driving assembly comprises a ratchet ring and a ratchet seat, the inner circumference of the ratchet ring is provided with a plurality of unidirectional oblique tooth surfaces, the outer circumference of the ratchet ring is provided with a plurality of embedded ribs, the embedded ribs are embedded in the clamping ribs of the fixing ring in the hub shell, the outer circumference of one end of the ratchet seat is provided with a plurality of groups of oppositely arranged combination parts, an elastic part and a pawl which is propped against the oblique tooth surfaces are assembled, the end of the bidirectional driving seat is provided with a plurality of embedded ribs, and the embedded ribs of the bidirectional driving seat are embedded with the clamping ribs of the fixing ring in the hub shell; the structure can be matched with the requirements of riders and is converted into one-way drive or two-way drive, so that the function of improving the applicability of the hub is achieved, the types of products required to be produced by manufacturers are simplified, the inventory of the products is reduced, and the effect of reducing the production cost is achieved.

Description

Driving device for bicycle rear hub

technical field

The present invention relates to a "driving device for the rear hub of a bicycle", especially by changing the combination of the ratchet ring and the ratchet seat in the one-way drive assembly, which can be applied to a bicycle with a left-hand chain or a right-hand chain. Moreover, because its structure can be converted into one-way drive or two-way drive to meet the needs of riders, it can achieve the function of improving the applicability of the hub, thereby simplifying the types of products that the industry needs to produce, thereby reducing the inventory of products, and achieving The effect of reducing production costs.

Background technique

There is an existing hub driving device for a bicycle, which is shown in FIG. 15 in combination with FIG. 16. It includes: a hub shell 40 and a ratchet plate 50, wherein a hub shell 40 is provided with an accommodating space 41, the accommodating space 41 is pivotally provided with a mandrel 42, the two ends of the mandrel 42 are provided with locking pieces 421, and the accommodating space 41 is provided with a fixed seat 43 integrally arranged on the inner peripheral ring, and the inner of the fixed seat 43 The edge ring is provided with a plurality of convex ribs 431, and an actuating ring 44 is embedded therefrom. The actuating ring 44 is provided with a plurality of square engaging grooves 441 on the inner peripheral ring, and ratchet discs 50 are respectively provided on both sides. There is a chainring 51 for setting the chain and a ratchet seat 52. The ratchet seat 52 is accommodated in the accommodating space 41 of the hub shell 40. The ratchet seat 52 is provided with a plurality of coupling grooves 53 on the outer peripheral ring. The coupling grooves 53 is provided with a spring 531 and a ratchet 532, the spring 531 braces against the inner side of the ratchet 532, so that the ratchet 532 can reach the engagement groove 441 of the actuating ring 44; when the bicycle moves forward and rotates the ratchet plate 50, the ratchet The tooth 532 can push against the engaging groove 441 of the actuating ring 44, and then drive the hub shell 40 to rotate, and when the ratchet plate 50 stops rotating, the ratchet 532 will be disengaged from the engaging groove 441, and the spring 531 will be compressed. It is used to achieve the state transition between the stepping combination and the non-stepping automatic separation between the hub shell 40 and the ratchet plate 50; when the user wants to change the right chain to the left side of the car body due to different riding habits, it can be The position of the spring 531 and the ratchet 532 installed in the joint slot 53 in the ratchet seat 52 can be exchanged to achieve the purpose of being suitable for the left chain of the bicycle.

It is not difficult to find that there are still some deficiencies in the above-mentioned existing structure in detail, and the main reasons are summarized as follows:

(1) The ratchet 532 is supported by the spring 531 and abuts against the engaging groove 441 of the actuating ring 44, thereby driving the hub shell 40 to rotate, but the engaging groove 441 of the actuating ring 44 is square, The contact area of the ratchet 532 is too small, resulting in insufficient structural strength.

(2) The engaging groove 441 of the actuating ring 44 is square, so that the height of the collision of the ratchet 532 increases, that is, the volume of the actuating ring 44 is larger, resulting in an increase in the swing range of the ratchet 532 on the actuating ring 44 , resulting in insufficient sensitivity.

(3), its actuating ring 44 is arranged on the fixed seat 43 of the hub shell 40, and forms axial positioning with the ratchet disc 50 through the inner wall of the hub shell 40, and the actuating ring 44 and the ratchet disc 50 still have An appropriate gap makes the actuating ring 44 have space for axial displacement, which is easy to cause wear of the ratchet plate 50 and the actuating ring 44, thereby reducing the durability of the hub structure.

Four, its one-way driving mode is only suitable for general riding, and is not suitable for stunts that need to synchronously drive the wheels to produce forward and reverse actions. In this way, the additional cost of bicycles will be increased. However, due to the low applicability of the hub, the industry must simultaneously produce a variety of different styles of hubs and corresponding components, which will increase the cost of production molds and increase the lack of inventory .

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

Contents of the invention

Technical problems to be solved:

(1) The ratchet system is supported by the spring against the engaging groove of the actuating ring, thereby driving the hub shell to rotate, but the engaging groove of the actuating ring is square, so that the contact area of the ratchet is If it is too small, the structural strength will be insufficient.

(2) The engagement groove of the actuating ring is square, which increases the contact height of the ratchet, that is, the volume of the actuating ring is larger, resulting in an increase in the swing range of the ratchet on the actuating ring, resulting in insufficient sensitivity Case.

(3) The actuating ring is set on the fixed seat of the hub shell, and the axial positioning is formed by the inner wall of the hub shell and the ratchet plate, and the actuating ring and the ratchet plate still have an appropriate gap, so that the actuating There is room for axial displacement of the ring, which is likely to cause abrasion of the ratchet plate and the actuating ring, thereby reducing the durability of the hub structure.

(4), its one-way driving mode is only applicable to general riding and is not suitable for stunts that must synchronously drive the wheels to produce forward and reverse actions. In this way, the cost of additional purchases of bicycles will be increased. Furthermore, As far as the employees are concerned, due to the low applicability of the flower hub, the industry must simultaneously produce various styles of flower hubs and corresponding components, which will increase the cost of production mold opening and increase the inventory missing.

Technical features to solve the problem:

The present invention provides a driving device for a rear hub of a bicycle, which comprises: a hub shell, an accommodating space is provided on one side of the hub shell; There is a threaded section, the threaded section is used for a locking piece to be locked, and the accommodating space is provided with a plurality of fitting grooves on the inner peripheral ring, and the fitting grooves are embedded with a fixed ring in a tight fit mode. The inner peripheral ring is provided with a plurality of engaging ribs, and a retaining edge and a retaining groove are respectively provided inside and outside the fitting groove. The retaining edge is used for setting a bearing, and the bearing is used for the spindle to pass through in a tight fit. The side of the bearing is positioned by a stopper, and the card groove is used for a limiter to be embedded; a one-way drive assembly, the one-way drive assembly includes a ratchet ring and a ratchet seat, and the ratchet ring is on the inner periphery The ring is provided with a plurality of one-way inclined helical tooth surfaces, and a plurality of fitting ribs are arranged on the outer peripheral ring, and the fitting ribs are embedded in the engaging ribs of the fixed ring in the hub shell, and a ratchet seat is axially penetrated with a Piercing holes are provided for the pivoting of the hub shell. In addition, the ratchet seat is provided with a plurality of sets of opposite joints on the outer circumference of one end, and one of the joints is recessed with a first joint on the side axially. groove, and the other joint portion is axially recessed on the opposite side with a second assembly groove. The first and second assembly grooves are respectively used for assembly of an elastic member and a pawl, and the elastic member supports the inner side of the pawl. , the pawl abuts against the helical tooth surface of the ratchet ring, the pawl is provided with a pivoting portion at one end, and the ratchet seat is provided with a toothed plate at the other end; and a two-way drive seat, which penetrates in the axial direction A through hole is provided for pivoting the mandrel of the hub shell. The two-way driving seat is provided with a plurality of fitting ribs on one end ring. The two-way driving seat is further provided with a chainring at the other end, thereby obtaining a driving device for a rear hub of a bicycle.

Efficacy compared to previous techniques:

(1) The present invention provides a driving device for the rear hub of a bicycle, which can be applied to a bicycle with a left-hand chain or a right-hand chain by changing the combination mode, and the pawl is against the helical tooth surface of the ratchet ring , to increase the contact area of the pawl, thereby improving the structural strength and increasing its durability.

(2) The present invention provides a driving device for a bicycle rear hub. The ratchet ring has a helical tooth surface inclined in one direction, and the helical tooth surface and the ratchet pawl at the ratchet seat form an action. The surface can reduce the collision height, and reduce the volume of the ratchet ring, which can reduce the swing range of the ratchet, so as to improve its sensitivity.

(3) The present invention provides a driving device for the rear hub of a bicycle. Since the fixed ring and the ratchet ring are sandwiched between the stopper and the limiter, axial sliding of the fixed ring and the ratchet ring is prevented. Therefore, the axial friction and collision thereof are reduced, so as to reduce the rotation resistance of the one-way driving assembly and increase its durability.

(4) The present invention provides a driving device for a rear hub of a bicycle. Because its structure can meet the needs of the rider, it can be converted into a one-way drive or a two-way drive mode to achieve the function of improving the applicability of the hub, thereby simplifying the The types of products that the industry needs to produce, thereby reducing the inventory of products and achieving the effect of reducing production costs.

Description of drawings

Fig. 1: is the three-dimensional assembly diagram of the present invention.

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

Fig. 3: is a schematic cross-sectional view of the first combination type of the present invention.

Fig. 4: It is the action diagram 1 of the first combined type of the present invention.

Figure 5: is the second schematic diagram of the action of the first combined type of the present invention.

Fig. 6: It is a schematic diagram of the state where the first combination type of the present invention is arranged on the right side of the vehicle body.

Fig. 7 is a schematic cross-sectional view of the first combination type of the present invention arranged on the right side of the vehicle body.

Fig. 8: It is a schematic diagram of the state where the first combined type of the present invention is arranged on the left side of the car body.

Fig. 9 is a schematic cross-sectional view of the first combination type of the present invention arranged on the left side of the vehicle body.

Fig. 10 is a schematic cross-sectional view of the second combination type of the present invention.

Figure 11: is the first schematic diagram of the action of the second combined type of the present invention.

Fig. 12: is the second schematic diagram of the action of the second combined type of the present invention.

Fig. 13 is an exploded schematic view of another embodiment of the present invention.

Fig. 14: is a three-dimensional combined view of another embodiment of the present invention.

Fig. 15: is the three-dimensional exploded view of the prior art.

Fig. 16: is a schematic cross-sectional view of the prior art.

[Description of main component symbols]

Part of the invention:

Hub shell---10 Accommodating space--11

Mandrel ----111 Thread section---112

Locking piece --- 113 Embedding groove --- 12

Fixing ring --- 121 Snapping rib --- 122

Retaining edge----13 Bearing----131

Block ---- 132 Card slot ---- 14

Limiting piece --- 141 Locking section --- 15

One-way flywheel--16

One-way drive assembly 20 ratchet ring---21

Helical tooth surface --- 211 Fitting rib --- 212

Tool hole---213 Ratchet seat---22

Piercing hole---221 Bushing---222

Joint --- 223, 2230 The first set of slots - 2231

The second set of slots - 2232 Elastic piece --- 224

Assembly---2241 Stop end---2242

Support end---2243 pawl----225

Pivot --- 2251 Chainring --- 226

Two-way drive seat-30 Through hole---31

Bushing ---- 311 Fitting rib---32

Sprocket ---- 33

Existing part:

Hub shell---40 Accommodating space--41

Mandrel ---- 42 Locking piece---421

Fixed seat---43 Convex card rib---431

Actuating ring---44 Engaging slot---441

Ratchet --- 50 Chainring --- 51

Ratchet seat --- 52 Combining groove --- 53

Spring----531 Ratchet----532

Detailed ways

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

First of all, as shown in Figures 1 and 2, a driving device for a rear hub of a bicycle includes: a hub shell 10, a one-way drive assembly 20 and a two-way drive seat 30, wherein the hub One side of the hub shell 10 is provided with an accommodating space 11, the accommodating space 11 is pivotally provided with a mandrel 111, and one end of the mandrel 111 is provided with a threaded section 112, and the threaded section 112 is used for locking by a locking member 113. The accommodating space 11 is provided with a plurality of fitting grooves 12 on the inner peripheral ring. The fitting grooves 12 are embedded with a fixed ring 121 in a tight fit. The fixed ring 121 is made of steel material, thus enhancing the hub. For the structural strength of the shell 10, the fixed ring 121 is provided with a plurality of engaging ribs 122 on the inner peripheral ring, and a retaining edge 13 and a retaining groove 14 are respectively provided on the inside and outside of the fitting groove 12, and the retaining edge 13 is provided for A bearing 131 is provided, and the bearing 131 is used for the mandrel 111 to pass through in a tight-fitting manner. The side of the bearing 131 is blocked by a stopper 132 to form a position. Part 141 is a C-shaped buckle. The one-way drive assembly 20 includes a ratchet ring 21 and a ratchet seat 22. The ratchet ring 21 is made of steel. Slanted helical tooth surface 211, and a plurality of fitting ribs 212 are arranged on the outer peripheral ring, and the fitting ribs 212 are embedded in the engaging ribs 122 of the fixed ring 121 in the hub shell 10, and the ratchet ring 21 is connected on the inner periphery The ring is provided with a plurality of tool holes 213, which are convenient for hand tools to be inserted for disassembly. The ratchet seat 22 is axially provided with a piercing hole 221, and the piercing hole 221 is also provided with a bushing 222, so that the hub shell 10 The mandrel 111 is pivoted, and the outer circumference of one end of the ratchet seat 22 is provided with a plurality of sets of joint parts 223, 2230 oppositely arranged, and one of the joint parts 223 is provided with a concave arc-shaped first group on the side axially. The connecting groove 2231, and the other connecting portion 2230 is provided with a concave arc-shaped second group connecting groove 2232 in the axial direction on the opposite side. The first and second group connecting grooves 2231, 2232 respectively provide an elastic member 224 and a The ratchet 225 is assembled, and the elastic member 224 has a connecting portion 2241, and extends from the connecting portion 2241 to both ends to form a blocking end 2242 and a supporting end 2243 respectively, and the blocking end 2242 is against the outer periphery of the ratchet seat 22 , the support end 2243 is against the inner side of the ratchet 225, the ratchet 225 is made of steel material, the ratchet 225 is against the helical tooth surface 211 of the ratchet ring 21, and the ratchet 225 is provided with a pivot at one end part 2251, and the ratchet seat 22 is provided with a toothed disc 226 at the other end, the toothed disc 226 can be a multi-piece combined structure, thereby achieving the effect of rear wheel speed change, the two-way drive seat 30 is provided with a consistent The through hole 31 is provided with a bushing 311 for pivoting the mandrel 111 of the hub shell 10. The two-way drive seat 30 is provided with a plurality of fitting ribs 32 on one end ring, and the fitting ribs 32 and the hub The engagement ribs 122 of the fixed ring 121 in the shell 10 are embedded together, and the two-way drive seat 30 is provided with a toothed disc 33 at the other end, and the toothed disc 33 33 can be a multi-plate combined structure, thus reaching the effect of rear wheel speed change.

Continuing, please observe from FIG. 2 and FIG. 3 , when the user wants to carry out general riding, that is, the hub shell 10 is combined with the one-way drive assembly 20 , and the ratchet ring 21 in the one-way drive assembly 20 is firstly assembled. The fitting rib 212 of the hub shell 10 is opposite to and embedded with the engaging rib 122 of the fixed ring 121, and then the limiting member 141 is embedded in the locking groove 14 to form a stop limit, and because the fixing ring 121 and the ratchet ring 21 is sandwiched between the stopper 132 and the limiter 141, thereby preventing the fixed ring 121 and the ratchet ring 21 from sliding axially, thereby reducing their axial friction and collision, and reducing the friction of the one-way drive assembly 20. Rotation resistance and increase its durability, in addition, the connecting part 2241 of the elastic member 224 and the pivoting part 2251 of the ratchet 225 are respectively assembled in the first grouping groove 2231 and the second grouping groove 2232 of the ratchet seat 22, and Make the stop end 2242 of the elastic member 224 against the outer periphery of the ratchet seat 22, and allow the support end 2243 of the elastic member 224 to be against the inside of the ratchet 225, that is, complete the combination of the one-way drive assembly 20, and then make the one-way drive assembly 20 The through hole 221 of the ratchet seat 22 is pivoted on the spindle 111 of the hub shell 10, and the pawl 225 of the ratchet seat 22 is pressed against the helical tooth surface 211 of the ratchet ring 21, and then the locking member 113 is locked. The threaded section 112 provided on the mandrel 111, according to which, the combination is completed;

Continuing, please observe from FIG. 4 with FIG. 2 , when the user steps on the bicycle pedal, the chain will drive the chainring 226 of the ratchet seat 22 in the one-way drive assembly 20 to rotate, so that the pawl 225 is elastically The member 224 pushes against the helical tooth surface 211 of the ratchet ring 21. At this time, because the fitting rib 212 of the ratchet ring 21 is engaged with the engaging rib 122 of the hub shell 10, the ratchet can pass through the The gear ring 21 drives the hub shell 10 to rotate synchronously; in addition, when the user stops stepping on the pedal, the pawl 225 will be pushed by the end edge of the helical tooth surface 211 of the ratchet ring 21, and the pawl 225 will be pivoted. The rotating part 2251 is a fulcrum that swings toward the direction of the elastic member 224, and then makes the hub shell 10 and the ratchet seat 22 separate. Please also observe it from FIG. 5. Through the above actions, it has the function of driving the hub shell 10 in one direction. ;

Moreover, Fig. 1 to Fig. 7 show that the ratchet seat 22 is installed on the bicycle in the state where the chain is placed on the right side, as described in the above combination, the elastic member 224 is arranged in the first joint groove 2231, and the ratchet 225 is arranged in the The second joint groove 2232, and the ratchet 225 can contact the helical tooth surface 211 of the ratchet ring 21 to form a linkage effect when the bicycle is moving forward. When interchanging with the chain on the right side, please continue to view as shown in Figure 8 and Figure 9, when the hub structure is assembled, its ratchet ring 21 is inserted in the hub shell 10 in the other direction, and The fitting rib 212 of the ratchet ring 21 is embedded in the engaging rib 122 of the hub shell 10 , so that the helical tooth surface 211 of the ratchet ring 21 can form a deflection in another direction, and then installed on the ratchet seat 22 The elastic member 224 and the ratchet 225 of the first group connection groove 2231 and the second group connection groove 2232 are arranged in the second group connection groove 2232, and the ratchet 225 is arranged on the bicycle with the left chain. The first set of connecting grooves 2231 can produce the same actuation mode as that of a bicycle with a right-mounted chain through the transformation of its combination mode, so that the hub shell 10 can achieve the purpose of being suitable for a bicycle with a left-hand or right-mounted chain.

Figures 1 to 9 show the state where the one-way drive assembly 20 is installed on the hub shell 10, which can achieve the purpose of driving the hub shell 10 in one direction, and when the user wants to perform stunts, the original The one-way drive mode is changed to the two-way drive mode. Please continue to view from Figure 2 with Figure 10. This is the state where the two-way drive seat 30 is installed on the hub shell 10. The combination of the hub structure, when combined Firstly, the two-way driving seat 30 is pivoted on the spindle 111 of the hub shell 10 through the through hole 31, and the fitting rib 32 of the two-way driving seat 30 is opposite to and embedded in the engaging rib 122 of the fixing ring 121 in the hub shell 10. , and lock the locking piece 113 on the threaded section 112 of the mandrel 111 to form a position, and accordingly, the combination is completed; when the user steps on the bicycle pedal, the chain will drive the chainring of the two-way drive seat 30 33 to rotate, and since the two-way drive seat 30 is directly embedded in the engagement rib 122 of the fixed ring 121 in the hub shell 10 with the fitting rib 32, the two-way drive seat 30 can be synchronized regardless of forward rotation or reverse rotation. Drive the wheels to produce forward and reverse actions (please observe from Figure 11 and Figure 12 at the same time), that is, it has an effect that cannot be achieved in the general riding state, because the hub shell 10 can meet the needs of the rider and can be converted One-way drive or two-way drive can achieve the function of improving the applicability of the hub, thereby simplifying the types of products that the industry needs to produce, thereby reducing the inventory of products, and achieving the effect of reducing production costs.

In addition, as shown in Figure 13 and Figure 14, another embodiment of the invention, the hub shell 10 is extended with a locking section 15 on the other side, so that users can lock different locks according to their own preferences. The one-way flywheel 16 with the number of teeth can endow the bicycle with the transmission efficiency of labor-saving slowing down or relatively laborious speeding up, thereby improving the flexibility of using the hub and further enhancing the practicability of the hub.

The structure of the above-mentioned specific embodiment can obtain the following benefits: one can be applied to bicycles with a left chain or a right chain by changing the combination mode, and the ratchet 225 abuts against the helical tooth surface of the ratchet ring 21 211, in order to increase the contact area of ratchet 225, thereby can promote the intensity on structure, to increase its durability; Two its ratchet ring 21 has the helical tooth surface 211 of unidirectional deflection, and with helical tooth surface 211 It forms an action with the pawl 225 at the ratchet seat 22, and the height of the collision can be reduced through the helical tooth surface 211, and the volume of the ratchet ring 21 can be reduced, so that the swing range of the pawl 225 can be reduced to improve its sensitivity; three reasons The fixed ring 121 and the ratchet ring 21 are sandwiched between the stopper 132 and the limiter 141, thereby preventing the fixed ring 121 and the ratchet ring 21 from sliding axially, thereby reducing their axial friction and collision, and for Reduce the rotation resistance of the one-way drive assembly 20 and increase its durability; Fourth, because the hub shell 10 can meet the needs of the rider, it can be converted into a one-way drive or a two-way drive to achieve the function of improving the applicability of the hub. This simplifies the types of products that the industry needs to produce, thereby reducing the inventory of products and achieving the effect of reducing production costs; 5. Since the ratchet ring 21 and the pawl 225 are all made of steel materials, the function of increasing structural strength is achieved. .

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.

Only the above is only a preferred embodiment of the present invention, and should not be used to 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 belong to the patent of the present invention. within the scope covered.

Claims (9)

1. A driving device for a rear hub of a bicycle, characterized in that it comprises: A flower hub shell, the flower hub shell is provided with an accommodating space on one side, and a mandrel is arranged through the accommodating space, and a threaded section is provided at one end of the mandrel, and a locking part is used for locking the threaded section, and the accommodating There are multiple fitting grooves in the inner peripheral ring of the space, and a fixed ring is embedded in the fitting groove in a tight fit mode. The inner and outer sides are respectively provided with a retaining edge and a locking groove. The retaining edge is used for setting a bearing. The bearing is used for the mandrel to pass through in a tight fit. A limit piece is embedded; A one-way drive assembly, the one-way drive assembly includes a ratchet ring and a ratchet seat, the ratchet ring is provided with a plurality of unidirectionally inclined helical tooth surfaces on the inner peripheral ring, and a plurality of fittings are provided on the outer peripheral ring Rib, the fitting rib is embedded in the engaging rib of the fixed ring in the hub shell, and a perforation hole is provided in the axial direction of the ratchet seat, and the perforation hole is used for pivoting the mandrel of the hub shell. There are multiple sets of opposite joints, one of which is axially recessed with a first set of joint grooves on the side, and the other joint portion is provided with a second set of joint grooves axially recessed on the opposite side. , The second set of connecting grooves are respectively provided with an elastic member and a ratchet. The elastic member supports the inner side of the ratchet, and the ratchet contacts the helical tooth surface of the ratchet ring. The ratchet is provided with a pivoting part at one end. and the ratchet seat is further provided with a chainring at the other end; and A two-way drive seat, the two-way drive seat is provided with a through hole in the axial direction, the through hole is used for the pivoting of the hub shell, the two-way drive seat is provided with a plurality of fitting ribs on one end ring, the fitting ribs of the two-way drive seat Embedded with the engaging rib of the fixed ring in the hub shell, the two-way drive seat is provided with a toothed plate at the other end. 2. The driving device for the rear hub of a bicycle according to claim 1, wherein the fixed ring, the ratchet ring and the ratchet are made of steel. 3 . The driving device for the rear hub of a bicycle according to claim 1 , wherein the stopper of the hub shell is a C-shaped buckle. 4 . 4. The driving device for the rear hub of a bicycle according to claim 1, wherein the ratchet ring of the one-way driving assembly is provided with a plurality of tool holes on the inner peripheral ring. 5 . The driving device for the rear hub of a bicycle according to claim 1 , wherein the first set of connecting grooves and the second set of connecting grooves of the joint part in the ratchet seat are concave arc-shaped. 6 . 6 . The driving device for the rear hub of a bicycle according to claim 1 , wherein the elastic member is disposed in the first joint groove, and the ratchet is disposed in the second joint groove. 7 . 7 . The driving device for the rear hub of a bicycle according to claim 1 , wherein the elastic member is arranged in the second connecting groove, and the ratchet is arranged in the first connecting groove. 8 . 8. The driving device for the rear hub of a bicycle according to claim 1, wherein the elastic member has a joint part, and extends from the joint part to both ends to form a stop end and a supporting end respectively, The blocking end is against the outer periphery of the ratchet seat, and the supporting end is against the inner side of the ratchet. 9 . The driving device for the rear hub of a bicycle according to claim 1 , wherein the hub shell is further provided with a locking section extending from the other side.

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