Speed change system and bicycle

Abstract

The utility model belongs to the technical field of bicycle speed control systems, and discloses a speed control system and a bicycle, in the speed control system, a planet wheel of a planet gear set is connected with a multi-stage driven wheel set to form an amplification wheel set, an inner gear ring is fixed on an outer shell, and a multi-stage driving wheel set is rotatably arranged on a transmission shaft. The multi-stage driven wheel set is rotationally arranged on the output shaft, and a first clutch transmission assembly is arranged between the transmission shaft and each stage of the multi-stage driving wheel set. The first limiter can drive the first limiting shaft to enable the gear shifting convex part of the first limiting shaft to abut against the first clutch transmission assembly, so that the transmission shaft is in transmission connection with any stage of the driving wheel set; the second limiting stopper can drive the second limiting shaft to enable the gear shifting protruding part of the second limiting shaft to abut against the second clutch transmission assembly so that the output shaft and the amplification wheel set can be in transmission connection or drive the first limiting shaft to enable the gear shifting protruding part of the first limiting shaft to abut against the third clutch transmission assembly so that the output shaft and the sun wheel can be in transmission connection.

Description

Technical Field

[0001] This utility model relates to the technical field of bicycle transmission systems, and more particularly to a transmission system and a bicycle. Background Technology

[0002] Chinese patent CN113401274A discloses a bicycle bottom bracket internal gearbox, including a housing, an input shaft, an output shaft, and a gear shifting unit. The two ends of the input shaft are connected to the bicycle pedals, and the output shaft is connected to the wheel. The input shaft and the output shaft are connected by the gear shifting unit. The gear shifting unit includes a drive gear set, a driven gear set, a transmission gear set, and a shift gear set. The shift gear set includes a shift drive gear, a shift driven gear, a number of drive shift forks matching the number of drive gears, and a number of driven shift forks matching the number of driven gears. The shift drive gear has a drive insertion hole, and the shift driven gear has a driven slot.

[0003] The aforementioned gearboxes are complex in structure and are relatively heavy and bulky. Utility Model Content

[0004] In view of this, the present invention provides a transmission system and a bicycle to solve the problems of complex structure, large weight and size of the gearbox in existing bicycles.

[0005] To achieve one or more of the above objectives or other objectives, this utility model proposes a transmission system, comprising: a power shaft, a transmission shaft that is at least partially hollow, a first limiter, an output shaft that is at least partially hollow, a second limiter, a planetary gear set, a multi-stage driving gear set, and a multi-stage driven gear set;

[0006] The power shaft, transmission shaft, and output shaft can all be rotatably connected to the outer housing, with the power shaft and transmission shaft being connected in a transmission connection.

[0007] Each of the multi-stage drive wheel sets can be rotatably mounted on the drive shaft, and a first clutch transmission assembly is provided between the drive shaft and each stage of the multi-stage drive wheel set;

[0008] The sun gear and the multi-stage driven gear set of the planetary gear set are rotatably mounted on the output shaft, and the multi-stage driven gear set is coaxially fixedly connected to form an amplifying gear set. The planet gears of the planetary gear set are connected to the driven gears of the amplifying gear set that are close to the planet gears. The internal gear ring is fixed on the outer housing. A second clutch transmission assembly is provided between the output shaft and the amplifying gear set, and a third clutch transmission assembly is provided between the output shaft and the sun gear.

[0009] The first limiter has a movable first limit shaft extending into the drive shaft, and the second limiter has a movable second limit shaft extending into the output shaft; both the first limit shaft and the second limit shaft have a shifting protrusion.

[0010] The first limiter can drive the first limit shaft so that its shifting protrusion abuts against any of the first clutch transmission components, thereby connecting the corresponding drive wheel with the output shaft; the second limiter can drive the second limit shaft so that its shifting protrusion abuts against the second clutch transmission component, thereby connecting the output shaft with the amplification wheel set, or drive the second limit shaft so that its shifting protrusion abuts against the third clutch transmission component, thereby connecting the output shaft with the sun gear.

[0011] Furthermore, the first, second, and third clutch transmission assemblies are all composed of a pawl and ratchet structure. The pawl is mounted on the drive shaft and the output shaft, and the ratchet structure is mounted on each stage of the multi-stage drive gear set, the sun gear, and the amplification gear set. The pawl is connected to a spring plate. When the pawl is not abutted by the shift protrusion, it is compressed by the spring plate and is in a retracted state, and the corresponding clutch transmission assembly is not connected. When the pawl is abutted by the shift protrusion, it is in an extended state, and the corresponding clutch transmission assembly is connected.

[0012] Furthermore, the first limiter also includes: a sliding cylinder;

[0013] One end of the slide tube is used to insert into and seal the oil cylinder on the outer housing, and the other end of the slide tube extends into the inside of the output shaft to connect to the second limiting shaft.

[0014] The second limiter has the same structure as the first limiter.

[0015] Furthermore, the transmission system also includes a driven sprocket keyed to the drive shaft, and a first limiting ring is provided on one side of the driven sprocket; the drive shaft is connected to the power shaft via the driven sprocket.

[0016] Each stage of the multi-stage drive wheel assembly has a structure with a first limiting ring on one side and a second limiting ring on the other side;

[0017] The driven sprocket and the adjacent first and second limit rings in the multi-stage drive wheel assembly are movably connected.

[0018] Furthermore, the driven wheel of the first stage closest to the planetary gear set in the multi-stage driven wheel set is connected to the planetary gears of the planetary gear set and is used as a planet carrier; the driven wheel has a first connecting part on the opposite side of the planetary gear, and the driven wheels of other stages in the multi-stage driven wheel set are sequentially sleeved and fixed on the first connecting part;

[0019] A support bearing is provided between the first connecting part and the output shaft;

[0020] The second clutch transmission assembly is located between the first connecting part and the output shaft.

[0021] Furthermore, the multi-stage driving wheel assembly includes: a first driving wheel, a second driving wheel, and a third driving wheel; the multi-stage driven wheel assembly includes: a first driven wheel, a second driven wheel, and a third driven wheel;

[0022] The first connecting part is a structure with a stepped external gear ring or a stepped connecting key connected axially to the first driven wheel; the second driven wheel and the third driven wheel are both fixedly connected to the first connecting part;

[0023] The first driving wheel meshes with the first driven wheel, the second driving wheel meshes with the second driven wheel, and the third driving wheel meshes with the third driven wheel.

[0024] Furthermore, the transmission system also includes a drive sprocket, which is mounted on the drive shaft and is connected to the driven sprocket via a chain.

[0025] Furthermore, the transmission system also includes a sprocket, which is fixed to the outer housing and connected to the chain to reduce the transmission space of the chain.

[0026] Furthermore, the multi-stage driving gear set is axially limited on the drive shaft by a snap ring, the multi-stage driven gear set is axially limited on the output shaft by a snap ring, and one end of the output shaft is also provided with a spline for connecting the chainring.

[0027] To achieve one or more of the above objectives or other objectives, this utility model also proposes a bicycle, which includes the gear transmission system described in any of the above claims.

[0028] Implementing the embodiments of this utility model will have the following beneficial effects:

[0029] After adopting the above-mentioned gear system, since the transmission shaft and output shaft of the gear system only contain planetary gear sets, multi-stage drive gear sets and multi-stage driven gear sets; the transmission process is adjusted by the first limit shaft set inside the transmission shaft and the second limit shaft set inside the output shaft. The multi-stage drive gear sets and multi-stage driven gear sets are directly driven, and no additional space is needed to arrange the transmission gear sets and gear sets. This optimizes the transmission process, making the bicycle gearbox structure simpler, and the weight and size can be made smaller. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] in:

[0032] Figure 1 This is an exploded view of the transmission system in one embodiment of the present invention;

[0033] Figure 2 This is a schematic diagram of the transmission system in one embodiment of the present invention;

[0034] Figure 3 for Figure 2 Another perspective;

[0035] Figure 4 This is an exploded view of the transmission system in another embodiment of the present invention;

[0036] Figure 5 This is an exploded view of the transmission system in another embodiment of the present invention;

[0037] Figure 6 This is a front view of the transmission system in one embodiment of the present invention;

[0038] Figure 7 for Figure 6 Schematic diagram of section AA;

[0039] Figure 8 This is a side view of the transmission system in one embodiment of the present invention;

[0040] Figure 9 for Figure 8 Schematic diagram of the BB section;

[0041] Figure 10 for Figure 8 Schematic diagram of the CC section.

[0042] Figure label:

[0043] 1. Housing; 101. Left housing; 1011. First hydraulic cylinder; 1012. Second hydraulic cylinder; 102. Right housing;

[0044] 2. Power shaft; 201. Power input end;

[0045] 3. Drive shaft;

[0046] 4. First limiter; 401. First limit shaft; 401a. Shift protrusion; 402. Slide cylinder;

[0047] 5. Output shaft; 501. Power output end;

[0048] 6. Second limit switch; 601. Second limit axis;

[0049] 7. Planetary gear set; 701. Sun gear; 702. Internal gear ring; 703. Planet gears;

[0050] 8. Multi-stage drive wheel assembly; 801, First drive wheel; 801a, Second limit ring; 802, Second drive wheel; 803, Third drive wheel;

[0051] 9. Multi-stage driven gear assembly; 901. First driven gear; 9011. First connecting part; 902. Second driven gear; 903. Third driven gear;

[0052] 10. Driven sprocket; 1001a. First limit ring;

[0053] 11. Support bearing;

[0054] 12. Drive sprocket;

[0055] 13. Sprocket;

[0056] 14. Snap ring. Detailed Implementation

[0057] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used herein in the specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and accompanying drawings of this invention are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, or accompanying drawings of this invention are used to distinguish different objects, not to describe a particular order.

[0058] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the present invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0059] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0060] Reference Figures 1 to 10 In some embodiments, the present invention proposes a transmission system, comprising: a power shaft, a transmission shaft that is at least partially hollow, a first limiter, an output shaft that is at least partially hollow, a second limiter, a planetary gear set, a multi-stage driving gear set, and a multi-stage driven gear set;

[0061] The power shaft, transmission shaft, and output shaft can all be rotatably connected to the outer housing, with the power shaft and transmission shaft being connected in a transmission connection.

[0062] Each of the multi-stage drive wheel sets can be rotatably mounted on the drive shaft, and a first clutch transmission assembly is provided between the drive shaft and each stage of the multi-stage drive wheel set;

[0063] The sun gear and the multi-stage driven gear set of the planetary gear set are rotatably mounted on the output shaft, and the multi-stage driven gear set is coaxially fixedly connected to form an amplifying gear set. The planet gears of the planetary gear set are connected to the driven gears of the amplifying gear set that are close to the planet gears. The internal gear ring is fixed on the outer housing. A second clutch transmission assembly is provided between the output shaft and the amplifying gear set, and a third clutch transmission assembly is provided between the output shaft and the sun gear.

[0064] The first limiter has a movable first limit shaft extending into the drive shaft, and the second limiter has a movable second limit shaft extending into the output shaft; both the first limit shaft and the second limit shaft have a shifting protrusion.

[0065] The first limiter can drive the first limit shaft so that its shifting protrusion abuts against any of the first clutch transmission components, thereby connecting the corresponding drive wheel with the output shaft; the second limiter can drive the second limit shaft so that its shifting protrusion abuts against the second clutch transmission component, thereby connecting the output shaft with the amplification wheel set, or drive the second limit shaft so that its shifting protrusion abuts against the third clutch transmission component, thereby connecting the output shaft with the sun gear.

[0066] In this embodiment, the aforementioned drive shaft has power input ends extending out of the housing at both ends. Both power input ends are used to connect the bicycle crank and pedals. Specifically, each end may have splines for connecting the crank and pedals to provide input power; alternatively, the drive shaft may connect the crank and pedals in the same or similar manner as in the prior art. The output shaft has a power output end extending out of the housing at one end. This power output end is used to connect to the bicycle chainring, which then transmits power to the wheels via a chain or similar means.

[0067] The aforementioned multi-stage driving gear sets and multi-stage driven gear sets can both be combinations of multiple gears of different sizes or specifications. For example, a multi-stage driving gear set is a combination of three gears of different sizes, and a multi-stage driven gear set is a combination of three gears of different sizes. Each gear corresponds to one stage, such as... Figure 6 and Figure 7 As shown, it can also be a combination of four, five, or six gears, or even more, or a combination of two gears. The key is that after installation, the driving gear and driven gear of each stage mesh accordingly. More specifically, the sun gear of the aforementioned planetary gear set being coaxially and fixedly connected to the multi-stage driving gear set to form an amplifying gear set means that the sun gear and the multi-stage driving gear set are fixedly connected, forming a single unit. During use, the sun gear and the multi-stage driving gear set rotate together, meaning that the angular velocity of each gear on the sun gear and the multi-stage driving gear set is consistent. The aforementioned multi-stage driven gear set is rotatably mounted on the output shaft. Conversely, each gear on the multi-stage driven gear set rotates independently. The aforementioned first, second, and third clutch transmission components are all components that can disengage or engage the transmission. They can be pawl structures as described later, or other forms, such as two friction plates. The engagement or disengagement of the two friction plates is controlled by a shifting protrusion to control the disengagement or engagement of the transmission. Figures 6 to 10 For example, during operation, the first limiter drives the first limit shaft so that its shifting protrusion abuts against the first clutch transmission assembly required for output, thereby connecting the corresponding driving wheel and the drive shaft. The second limiter drives the second limit shaft so that its shifting protrusion abuts against the second clutch transmission assembly, thereby connecting the drive shaft and the driven wheel. Alternatively, the second limiter drives the second limit shaft so that its shifting protrusion abuts against the third clutch transmission assembly, thereby connecting the drive shaft and the sun gear. Taking the shifting protrusion of the first limit shaft abutting against the first clutch transmission assembly located at the leftmost gear position in the multi-stage driving gear set, and the shifting protrusion of the second limit shaft abutting against the third clutch transmission assembly as an example, the power is transmitted from the power shaft to the multi-stage driving gear set via the drive shaft, then from the driving wheel of the multi-stage driving gear set to the multi-stage driven gear set, and then amplified by the planetary gear set before being transmitted to the output shaft, ultimately driving the chainring connected to the output shaft for output. Although all stages of the multi-stage driving gear set and the multi-stage driven gear set are engaged in the above transmission process, only the first gear on the left side of the multi-stage driving gear set has a transmission relationship with the drive shaft. The other gears on the multi-stage driving gear set are idle and do not affect the transmission process.

[0068] In summary, when both the multi-stage driving and driven gear sets are three-stage, the output shaft drive connected to the amplifying gear set or sun gear can provide two different input speeds. The drive shaft, connected to the three-stage driving gear set, allows each stage to obtain a different output speed, resulting in a total of 2 x 3 = 6 different speed changes for the entire system. Similarly, when both the multi-stage driving and driven gear sets are four-stage, they can provide 2 x 4 = 8 different speed changes. Other number of stages follow the same logic and will not be elaborated further.

[0069] In some embodiments, the first clutch transmission assembly, the second clutch transmission assembly, and the third clutch transmission assembly are all composed of a pawl and a ratchet structure. The pawl is disposed on the drive shaft and the output shaft, and the ratchet structure is disposed on each stage of the sun gear, the amplifying gear set, and the multi-stage drive gear set. The pawl is connected to a spring plate. When the pawl is not abutted by the shift protrusion, it is compressed by the spring plate and is in a retracted state, and the corresponding clutch transmission assembly is not connected. When the pawl is abutted by the shift protrusion, it is in an extended state, and the corresponding clutch transmission assembly is connected.

[0070] In this embodiment, as Figure 9 and Figure 10 As shown, taking the first clutch transmission assembly on the drive shaft as an example, multiple pawl slots are provided on the input shaft at the position corresponding to each gear on the multi-stage drive gear set. Multiple pawls are installed in the pawl slots, and one end of a spring plate is connected to the pawl. The other end of the spring plate is fixed to the drive shaft. When the pawl is not abutted by the shift protrusion, it is compressed by the spring plate and is in a retracted state; when the pawl is abutted by the shift protrusion, it is in an extended state. The inner ring of each gear on the multi-stage drive gear set has a ratchet structure, such as... Figure 9 As shown, the ratchet structure on the other gears is similar to that described above. The first clutch transmission assembly described above is a combination of a pawl and a ratchet.

[0071] Reference Figure 4 , Figure 5 and Figure 7 In some embodiments, the first limiter further includes a slide cylinder;

[0072] One end of the slide tube is used to insert into and seal the oil cylinder on the sliding connection outer housing, and the other end of the slide tube extends into the inside of the drive shaft to connect to the first limiting shaft;

[0073] The second limiter has the same structure as the first limiter.

[0074] In this embodiment, the drive shaft does not need to extend through the housing for installation. The first limiter can be completely inserted into the output shaft. In this case, one end of the slide of the first limiter is inserted into and seals the sliding connection to the first hydraulic cylinder on the housing, while the other end of the slide extends into the output shaft and connects to the first limit shaft. This allows the movement of the slide to be controlled via an hydraulic circuit, thereby moving the first limit shaft and achieving precise control of the shift protrusion position within the drive shaft. Conversely, one end of the output shaft extends through the housing to output power to the chainring. The second limiter can be inserted into the output shaft from the other end. In this case, one end of the slide of the second limiter is inserted into and seals the sliding connection to the second hydraulic cylinder on the housing, while the other end extends into the output shaft and connects to the second limit shaft. This allows the movement of the slide to be controlled via an hydraulic circuit, thereby moving the second limit shaft and achieving precise control of the shift protrusion position within the output shaft.

[0075] Reference Figure 4 and Figure 5 In some embodiments, the transmission system further includes a driven sprocket keyed to the drive shaft, and a first limiting ring is provided on one side of the driven sprocket; the drive shaft is connected to the power shaft via the driven sprocket.

[0076] Each stage in the multi-stage drive wheel assembly has a structure with a first limiting ring on one side and a second limiting ring on the other side;

[0077] The driven sprocket and the adjacent first and second limit rings in the multi-stage drive wheel assembly are movably connected.

[0078] In this embodiment, a driven sprocket is mounted on the aforementioned drive shaft. Power is transmitted via this driven sprocket to the driving sprocket on the power shaft. Notably, the driven sprocket and each gear in all the multi-stage driving gear sets are movably engaged with each other. Specifically, each stage of the multi-stage driving gear set has a structure with a first limiting ring on one side and a second limiting ring on the other side. Adjacent first and second limiting rings in the driven sprocket and the multi-stage driving gear sets are movably engaged. This allows the driven sprocket to drive the drive shaft to rotate, while each gear in the multi-stage driving gear set rotates independently.

[0079] Reference Figures 2 to 5 In some embodiments, the driven wheel of the first stage of the multi-stage driven wheel set closest to the planetary gear set is connected to the planetary gears of the planetary gear set and is used as a planet carrier; the driven wheel has a first connecting part on the opposite side of the planetary gears, and the driven wheels of other stages in the multi-stage driven wheel set are sequentially sleeved and fixed on the first connecting part.

[0080] A support bearing is provided between the first connecting part and the output shaft;

[0081] The second clutch transmission assembly is located between the first connecting part and the output shaft.

[0082] In this embodiment, the driven wheel closest to the first stage of the planetary gear set in the multi-stage driven wheel set is connected to the planetary gears of the planetary gear set and is used as a planet carrier. This structural design eliminates the need for a separate planet carrier, saving space and materials.

[0083] Reference Figures 2 to 5 In some embodiments, the multi-stage driving wheel assembly includes: a first driving wheel, a second driving wheel, and a third driving wheel; the multi-stage driven wheel assembly includes: a first driven wheel, a second driven wheel, and a third driven wheel;

[0084] The first connecting part is a structure with a stepped external gear ring or a stepped connecting key connected axially to the first driven wheel; the second driven wheel and the third driven wheel are both fixedly connected to the first connecting part.

[0085] The first driving wheel meshes with the first driven wheel, the second driving wheel meshes with the second driven wheel, and the third driving wheel meshes with the third driven wheel.

[0086] In this embodiment, the structure of the first driven gear can resemble a stepped triple gear, while the second and third driven gears are fitted onto the steps of this triple gear, forming a whole. During movement, the overall angular velocity is consistent. Furthermore, a support bearing is provided between the first driven gear and the output shaft. Since the output shaft only has a transmission relationship with the sun gear or only with the amplifying gear set during movement, a support bearing is provided between the first driving gear and the output shaft. The entire system formed by the planetary gear set and the multi-stage driven gear set has two support points: a support bearing and an internal gear ring, resulting in smoother rotation and preventing system swaying.

[0087] Reference Figures 2 to 5 In some embodiments, the transmission system further includes a drive sprocket, which is mounted on the drive shaft and is connected to the driven sprocket via a chain.

[0088] Reference Figures 2 to 5 In some embodiments, the transmission system further includes a sprocket, which is fixed to the outer housing and connected to the chain to reduce the transmission space of the chain.

[0089] In this embodiment, the chain clamp can compress the chain width, as shown in Figure*, which can reduce the space occupied by some of the gear system, making the system more suitable for small or folding bicycles, so as to facilitate storage and carrying.

[0090] Reference Figures 2 to 5 In some embodiments, the multi-stage driving gear set is axially limited on the drive shaft by a snap ring, and the multi-stage driven gear set is axially limited on the output shaft by a snap ring. One end of the output shaft is also provided with a spline for connecting the chainring.

[0091] Reference Figure 1 In some embodiments, the housing is divided into left and right halves, namely the left housing and the right housing. To increase sealing, a sealing ring is provided at the joint between the left and right housings, providing waterproofing and dustproofing. The drive shaft, transmission shaft, and output shaft are all connected to the housing via bearings. Furthermore, it should be noted that the first and second hydraulic cylinders on the housing can be integrally formed with the housing, or they can be manufactured separately and then assembled onto the housing. The former offers better sealing, preventing sewage, mud, dust, and other contaminants from entering the transmission system and affecting its operation, while also achieving a cleaning-free and maintenance-free effect. The latter is simpler in process and easier to manufacture; adding a sealing ring at the joint achieves the same effect. In summary, after installing the transmission system of this invention, even when riding on muddy roads, there is no fear of damage to the system due to foreign objects entering, making it particularly suitable for mountain bikes.

[0092] In some embodiments, the present invention also provides a bicycle that includes any of the above-described gear transmission systems.

[0093] Obviously, the embodiments described above are only some embodiments of this utility model, not all embodiments. The accompanying drawings show preferred embodiments of this utility model, but do not limit the patent scope of this utility model. This utility model can be implemented in many different forms; rather, the purpose of providing these embodiments is to provide a more thorough and comprehensive understanding of the disclosure of this utility model. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing specific embodiments, or make equivalent substitutions for some of the technical features. Any equivalent structures made using the content of this utility model specification and drawings, directly or indirectly applied to other related technical fields, are similarly within the patent protection scope of this utility model.

Claims

1. A transmission system, characterized in that, include: A power shaft, a drive shaft that is at least partially hollow, a first limiter, an output shaft that is at least partially hollow, a second limiter, a planetary gear set, a multi-stage driving gear set, and a multi-stage driven gear set; The power shaft, transmission shaft, and output shaft can all be rotatably connected to the outer housing, with the power shaft and transmission shaft being connected in a transmission connection. Each of the multi-stage drive wheel sets can be rotatably mounted on the drive shaft, and a first clutch transmission assembly is provided between the drive shaft and each stage of the multi-stage drive wheel set; The sun gear and the multi-stage driven gear set of the planetary gear set are rotatably mounted on the output shaft, and the multi-stage driven gear set is coaxially fixedly connected to form an amplifying gear set. The planet gears of the planetary gear set are connected to the driven gears of the amplifying gear set that are close to the planet gears. The internal gear ring is fixed on the outer housing. A second clutch transmission assembly is provided between the output shaft and the amplifying gear set, and a third clutch transmission assembly is provided between the output shaft and the sun gear. The first limiter has a movable first limit shaft extending into the drive shaft, and the second limiter has a movable second limit shaft extending into the output shaft; both the first limit shaft and the second limit shaft have a shifting protrusion. The first limiter can drive the first limit shaft so that its shifting protrusion abuts against any of the first clutch transmission components, thereby connecting the corresponding drive wheel with the output shaft; the second limiter can drive the second limit shaft so that its shifting protrusion abuts against the second clutch transmission component, thereby connecting the output shaft with the amplification wheel set, or drive the second limit shaft so that its shifting protrusion abuts against the third clutch transmission component, thereby connecting the output shaft with the sun gear.

2. The transmission system according to claim 1, characterized in that, The first, second, and third clutch transmission assemblies are all composed of pawls and ratchet structures. The pawls are mounted on the drive shaft and output shaft, and the ratchet structures are mounted on each stage of the multi-stage drive gear set, the sun gear, and the amplification gear set. The pawls are connected to spring plates. When the pawls are not abutted by the shift protrusion, they are compressed by the spring plates and are in a retracted state, and the corresponding clutch transmission assembly is not connected. When the pawls are abutted by the shift protrusion, they are in an extended state, and the corresponding clutch transmission assembly is connected.

3. The transmission system according to claim 1, characterized in that, The first limiter further includes: a sliding cylinder; One end of the slide tube is used to insert into and seal the oil cylinder on the outer housing, and the other end of the slide tube extends into the inside of the output shaft to connect to the second limiting shaft. The second limiter has the same structure as the first limiter.

4. The transmission system according to claim 1, characterized in that, The transmission system also includes a driven sprocket keyed to the drive shaft, and a first limiting ring is provided on one side of the driven sprocket; the drive shaft is connected to the power shaft via the driven sprocket. Each stage of the multi-stage drive wheel assembly has a structure with a first limiting ring on one side and a second limiting ring on the other side; The driven sprocket and the adjacent first and second limit rings in the multi-stage drive wheel assembly are movably connected.

5. The transmission system according to claim 1, characterized in that, The driven wheel closest to the planetary gear set in the multi-stage driven wheel assembly is connected to the planetary gears of the planetary gear set and is used as a planet carrier; the driven wheel has a first connecting part on the opposite side of the planetary gears, and the driven wheels of the other stages in the multi-stage driven wheel assembly are sequentially sleeved and fixed on the first connecting part. A support bearing is provided between the first connecting part and the output shaft; The second clutch transmission assembly is located between the first connecting part and the output shaft.

6. The transmission system according to claim 5, characterized in that, The multi-stage driving gear set includes: a first driving gear, a second driving gear, and a third driving gear; the multi-stage driven gear set includes: a first driven gear, a second driven gear, and a third driven gear; The first connecting part is a structure with a stepped external gear ring or a stepped connecting key connected axially to the first driven wheel; the second driven wheel and the third driven wheel are both fixedly connected to the first connecting part; The first driving wheel meshes with the first driven wheel, the second driving wheel meshes with the second driven wheel, and the third driving wheel meshes with the third driven wheel.

7. The transmission system according to claim 4, characterized in that, The transmission system also includes a drive sprocket, which is mounted on the drive shaft and is connected to the driven sprocket via a chain.

8. The transmission system according to claim 7, characterized in that, The transmission system also includes a sprocket, which is fixed to the outer housing and connected to the chain to reduce the transmission space of the chain.

9. The transmission system according to claim 1, characterized in that, The multi-stage driving gear set is axially limited on the drive shaft by a snap ring, and the multi-stage driven gear set is axially limited on the output shaft by a snap ring. One end of the output shaft is also provided with a spline for connecting the chainring.

10. A bicycle, characterized in that, The bicycle includes the transmission system as described in any one of claims 1 to 9.

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