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 sun gear of a planetary gear set is coaxially and fixedly connected with a multi-stage driving wheel set to form an amplification wheel set, and an inner gear ring is fixed on a shell. A planet carrier of the planetary gear set, a sun gear and the multi-stage driving wheel set are all rotatably arranged on the power shaft, the multi-stage driven wheel set is rotatably arranged on the output shaft, and a third clutch transmission assembly is arranged between the output shaft and each stage of the multi-stage driven 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 to enable the power shaft to be in transmission connection with the planet carrier, or drive the first limiting shaft to enable the gear shifting convex part of the first limiting shaft to abut against the second clutch transmission assembly to enable the power shaft to be in transmission connection with the amplification wheel set; the second limiting stopper can drive the second limiting shaft to enable the gear shifting convex part of the second limiting shaft to abut against any third clutch transmission assembly so that the corresponding driven wheel can be in transmission connection with the output shaft.

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] Because the aforementioned gearbox includes not only the driving gear set and the driven gear set, but also the transmission gear set and the speed change gear set, the entire gearbox has a complex structure and is relatively heavy and large in size. 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 housing, a power 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] Both the power shaft and the output shaft are rotatably connected to the housing, and the power shaft has a first power input end with both ends extending out of the housing, and the output shaft has a first power output end with one end extending out of the housing;

[0007] The sun gear of the planetary gear set is coaxially and fixedly connected with the multi-stage driving gear set to form an amplifying gear set. The internal gear ring is fixed on the housing. The planet carrier, sun gear and multi-stage driving gear set of the planetary gear set can all be rotatably mounted on the power shaft. A first clutch transmission assembly is provided between the power shaft and the planet carrier, and a second clutch transmission assembly is provided between the power shaft and the amplifying gear set.

[0008] The multi-stage driven wheel assembly is rotatably mounted on the output shaft, and a third clutch transmission assembly is provided between the output shaft and each stage of the multi-stage driven wheel assembly;

[0009] The first limiter has a movable first limit shaft extending into the power 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 the first clutch transmission assembly, thereby connecting the power shaft and the planetary carrier; or it can drive the first limit shaft so that its shifting protrusion abuts against the second clutch transmission assembly, thereby connecting the power shaft and the amplification gear set. The second limiter can drive the second limit shaft so that its shifting protrusion abuts against any of the third clutch transmission assemblies, thereby connecting its corresponding driven gear and the output shaft.

[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 power shaft and the output shaft, and the ratchet structure is mounted on each stage of the planetary carrier, the amplification gear set, and the multi-stage driven 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 slide bar, a connecting seat, and a drive pin;

[0013] The connecting seat has a through hole that is not less than the diameter of the drive shaft and not greater than the length of the slide rod. The sidewall of the through hole has an annular groove that can accommodate the slide rod. The bottom of the annular groove has a mounting hole that connects to the outside of the connecting seat.

[0014] The power shaft has a pair of sliding grooves. One end of the drive pin is sealed and slidably connected to the first oil cylinder on the housing, and the other end is connected to one side of the connecting seat. The connecting seat is sleeved on the power shaft. The slide rod is inserted into the connecting seat through the mounting hole and passes through one sliding groove to connect to the first limiting shaft and then passes through the other sliding groove. The slide rod is located in the annular groove and can rotate with the power shaft in the annular groove.

[0015] Furthermore, the second limiter also includes: a slide cylinder;

[0016] One end of the slide tube is inserted into and seals the second oil cylinder on the sliding connection housing, and the other end of the slide tube extends into the inside of the output shaft to connect to the second limiting shaft.

[0017] Furthermore, 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.

[0018] The first driving wheel is axially provided with a first connecting part, and the second driving wheel and the third driving wheel are sequentially sleeved and fixed on the first connecting part; the sun wheel is axially provided with a second connecting part, and the second connecting part is fixedly connected to the first connecting part.

[0019] 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.

[0020] Furthermore, the first connecting part is a structure with a stepped external gear ring and internal threads connected to the first driving wheel axis, and the second connecting part is a cylindrical structure with external threads connected to the sun wheel axis, and the first connecting part and the second connecting part are threadedly connected.

[0021] Furthermore, the transmission system also includes multiple support bearings. One support bearing is provided between the first driving wheel and the power shaft; another support bearing is provided between the first driven wheel and the output shaft; and a third driven wheel is provided between the third driven wheel and the output shaft. A first limiting ring is provided on one side wall of the first driven wheel and one side wall of the second driven wheel, and a second limiting ring is provided on the other side wall of the second driven wheel and one side wall of the third driven wheel. The first limiting ring on the side wall of the first driven wheel and the second limiting ring on the side wall of the second driven wheel are movably sleeved together. The first limiting ring on the side wall of the second driven wheel and the second limiting ring on the side wall of the third driven wheel are movably sleeved together.

[0022] Furthermore, the first drive wheel has a groove facing the slide bar side, and a pair of grooves on the drive shaft are at least partially located within the groove.

[0023] Furthermore, the housing includes a left cover, a right cover, and a middle shell with openings at both ends;

[0024] One end of the power shaft passes through the left cover and is connected to the left cover via a bearing, and the other end passes through the right cover and is connected to the right cover via a bearing, wherein the first hydraulic cylinder is disposed on the right cover;

[0025] The second hydraulic cylinder is mounted on the left cover; one end of the output shaft is connected to the left cover via a bearing, and the interface of the second hydraulic cylinder connecting to the slide is located inside the output shaft, while the other end passes through the right cover and is connected to the right cover via a bearing.

[0026] The left cover and the middle shell are sealed together at one end, and the right cover and the middle shell are sealed together at the other end. Furthermore, the first limiter also includes: a cylinder seat and a third cylinder mounted on the cylinder seat;

[0027] The cylinder seat is fixed on the housing, and the third cylinder penetrates the housing and is inserted into the power shaft; the end of the first limiting shaft away from the shift protrusion is sealed and slidably connected to the third cylinder.

[0028] Furthermore, the output shaft includes a first reversing gear set, which includes multiple reversing planetary gears, a transmission frame, and a first output cylinder;

[0029] The transmission frame is provided with an axially misaligned internal gear ring and a connecting ring, and the transmission frame is fixed to the output shaft by the connecting ring; multiple reversing planetary gears are mounted on the housing, and the reversing planetary gears mesh with the internal gear ring; the first output cylinder is rotatably mounted on the output shaft, and one end of the first output cylinder is provided with an external tooth for meshing with the reversing planetary gear, and the other end of the first output cylinder passes through the housing and is provided with a second power output end.

[0030] Furthermore, the output shaft includes a second reversing gear set, which includes a transmission gear and a second output cylinder;

[0031] The transmission gear is coaxially fixed on the output shaft;

[0032] The second output cylinder is rotatably mounted on the power shaft, and one end of the second output cylinder is provided with an output gear that meshes with the transmission gear, while the other end of the second output cylinder passes through the housing and is provided with a third power output end.

[0033] A transmission system includes: a housing, an input shaft, a power 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;

[0034] The input shaft, power shaft, and output shaft are all rotatably connected to the housing, and the input shaft has a second power input end with both ends extending out of the housing, and the output shaft has a first power output end with one end extending out of the housing;

[0035] The sun gear of the planetary gear set is coaxially and fixedly connected with the multi-stage driving gear set to form an amplifying gear set. The internal gear ring is fixed on the housing. The planet carrier, sun gear and multi-stage driving gear set of the planetary gear set can all be rotatably mounted on the power shaft. A first clutch transmission assembly is provided between the power shaft and the planet carrier, and a second clutch transmission assembly is provided between the power shaft and the amplifying gear set.

[0036] The input shaft is equipped with an input gear, which meshes with any one stage of the multi-stage drive gear set.

[0037] The multi-stage driven wheel assembly is rotatably mounted on the output shaft, and a third clutch transmission assembly is provided between the output shaft and each stage of the multi-stage driven wheel assembly;

[0038] The first limiter has a movable first limit shaft extending into the power 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.

[0039] The first limiter can drive the first limit shaft so that its shifting protrusion abuts against the first clutch transmission assembly, thereby connecting the power shaft and the planetary carrier; or it can drive the first limit shaft so that its shifting protrusion abuts against the second clutch transmission assembly, thereby connecting the power shaft and the amplification gear set. The second limiter can drive the second limit shaft so that its shifting protrusion abuts against any of the third clutch transmission assemblies, thereby connecting its corresponding driven gear and the output shaft.

[0040] 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.

[0041] Implementing the embodiments of this utility model will have the following beneficial effects:

[0042] After adopting the above-mentioned gear system, since the core transmission components of the gear system only include planetary gear sets, multi-stage drive wheelsets, and multi-stage driven wheelsets; the transmission process is adjusted by the first limit shaft set inside the drive shaft and the second limit shaft set inside the output shaft. The multi-stage drive wheelsets and multi-stage driven wheelsets directly transmit power, without the need for additional space to arrange the transmission gear sets and gear sets, thus optimizing the transmission process. This simplifies the structure of the bicycle gearbox, and the weight and size can be made smaller. Attached Figure Description

[0043] 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.

[0044] in:

[0045] Figure 1 This is an exploded view of the transmission system in one embodiment of the present invention;

[0046] Figure 2 This is an exploded view of the transmission system in another embodiment of the present invention;

[0047] Figure 3 This is an exploded view of the transmission system in another embodiment of the present invention;

[0048] Figure 4 This is a schematic diagram of the structure of the first drive wheel in one embodiment of the present invention;

[0049] Figure 5 This is a schematic diagram of the power shaft structure in one embodiment of the present invention;

[0050] Figure 6 This is a schematic diagram of the output shaft in one embodiment of the present invention;

[0051] Figure 7 This is a schematic diagram of the structure of the first limiter in one embodiment of the present invention;

[0052] Figure 8 for Figure 7 Another perspective;

[0053] Figure 9 This is a schematic diagram of the structure of the second limiter in one embodiment of the present invention;

[0054] Figure 10 This is a cross-sectional view of the transmission system in one embodiment of the present invention;

[0055] Figure 11 for Figure 10 Schematic diagram of the BB section;

[0056] Figure 12 for Figure 10 Schematic diagram of the C-section;

[0057] Figure 13 for Figure 10 Schematic diagram of the DD section;

[0058] Figure 14 for Figure 10 Schematic diagram of the EE section;

[0059] Figure 15 This is a schematic diagram showing the connection between the cylinder seat and the housing in Example 2;

[0060] Figure 16 This is a schematic diagram of the overall structure of the first limiter in Embodiment 2;

[0061] Figure 17 This is a schematic diagram showing the separation of the overall structure in Example 3;

[0062] Figure 18 This is a schematic diagram of the separation of the overall structure in Example 4. Figure 1 ;

[0063] Figure 19 This is a schematic diagram of the separation of the overall structure in Example 4. Figure 2 ;

[0064] Figure 20 This is an assembly diagram of the overall structure in Example 5;

[0065] Figure 21 This is a schematic diagram showing the separation of the overall structure in Example 4.

[0066] Figure label:

[0067] 1. Housing; 101. Right cover; 1011. First hydraulic cylinder; 102. Left cover; 1021. Second hydraulic cylinder; 103. Middle housing; 11. Input shaft; 110. Input gear; 111. Second power input end;

[0068] 2. Power shaft; 201. First power input end; 202. Slide groove;

[0069] 3. First limiter; 301. First limit shaft; 301a. Shift protrusion; 302. Slide rod; 303. Connecting seat; 3031. Through hole; 3032. Annular groove; 3033. Mounting hole; 304. Drive pin; 305. Cylinder seat; 306. Third cylinder;

[0070] 4. Output shaft; 401. First power output end; 41. First reversing gear set; 410. Reversing planetary gear; 411. Transmission frame; 4110. Internal gear ring; 4111. Connecting ring; 412. First output cylinder; 4120. External gear; 4121. Second power output end; 42. Second reversing gear set; 420. Transmission gear; 421. Second output cylinder; 4210. Output gear; 4211. Third power output end;

[0071] 5. Second limit switch; 501. Second limit shaft; 502. Slide cylinder;

[0072] 6. Planetary gear set; 601. Sun gear; 6011. Second connecting part; 602. Internal gear ring; 603. Planet carrier;

[0073] 7. Multi-stage drive wheel assembly; 701, first drive wheel; 701a, groove; 7011, first connecting part; 702, second drive wheel; 703, third drive wheel;

[0074] 8. Multi-stage driven gear assembly; 801, First driven gear; 801a, First limiting ring; 802, Second driven gear; 802a, Second limiting ring; 803, Third driven gear;

[0075] 9. Support bearing. Detailed Implementation

[0076] 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.

[0077] 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.

[0078] 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.

[0079] Example 1:

[0080] Reference Figures 1 to 14 In some embodiments, the present invention proposes a speed change system, including: a housing 1, a power shaft 2 that is at least partially hollow, a first limiter 3, an output shaft 4 that is at least partially hollow, a second limiter 5, a planetary gear set 6, a multi-stage driving gear set 7, and a multi-stage driven gear set 8.

[0081] Both the power shaft 2 and the output shaft 4 are rotatably connected to the housing 1. The power shaft 2 has a first power input end 201 with both ends extending out of the housing 1, and the output shaft 4 has a first power output end 401 with one end extending out of the housing 1.

[0082] The sun gear 601 of the planetary gear set 6 is coaxially and fixedly connected with the multi-stage drive gear set 7 to form an amplifying gear set. The internal gear ring 602 is fixed on the housing 1. The planet carrier 603, the sun gear 601 and the multi-stage drive gear set 7 of the planetary gear set 6 can all be rotatably mounted on the power shaft 2. A first clutch transmission assembly is provided between the power shaft 2 and the planet carrier 603, and a second clutch transmission assembly is provided between the power shaft 2 and the amplifying gear set.

[0083] The multi-stage driven wheel set 8 is rotatably mounted on the output shaft 4, and a third clutch transmission assembly is provided between the output shaft 4 and each stage of the multi-stage driven wheel set 8;

[0084] The first limiter 3 has a movable first limiter shaft 301 that extends into the power shaft 2, and the second limiter 5 has a movable second limiter shaft 501 that extends into the output shaft 4; both the first limiter shaft 301 and the second limiter shaft 501 have a shifting protrusion 301a.

[0085] The first limiter 3 can drive the first limit shaft 301 so that its shifting protrusion 301a abuts against the first clutch transmission assembly, thereby connecting the power shaft 2 and the planetary carrier 603; or drive the first limit shaft 301 so that its shifting protrusion 301a abuts against the second clutch transmission assembly, thereby connecting the power shaft 2 and the amplification gear set. The second limiter 5 can drive the second limit shaft 501 so that its shifting protrusion 301a abuts against any third clutch transmission assembly, thereby connecting its corresponding driven gear and the output shaft 4.

[0086] In this embodiment, the aforementioned drive shaft 2 has two first power input ends 201 extending out of the housing 1 at both ends. These two first power input ends 201 are used to connect the bicycle crank and pedals. The output shaft 4 has one first power output end 401 extending out of the housing 1. This first power output end 401 is used to connect to the bicycle chainring, which then transmits power to the wheel via a chain or similar means. The aforementioned multi-stage drive wheel set 7 and multi-stage driven wheel set 8 can both be combinations of multiple gears of different sizes or specifications. For example, the multi-stage drive wheel set 7 is a combination of three gears of different sizes, and the multi-stage driven wheel set 8 is a combination of three gears of different sizes. Each gear corresponds to one stage. Figure 1 and Figure 3 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 coaxial and fixed connection between the sun gear 601 of the planetary gear set 6 and the multi-stage driving gear set 7 to form an amplifying gear set means that the sun gear 601 and the multi-stage driving gear set 7 are fixedly connected, forming a single amplifying gear set. During use, the sun gear 601 and the multi-stage driving gear set 7 rotate together, meaning that the angular velocity of each gear on both sets is the same. The multi-stage driven gear set 8 is rotatably mounted on the output shaft 4. Conversely, each gear on the multi-stage driven gear set 8 rotates independently. The aforementioned first, second, and third clutch transmission assemblies are all components capable of disengaging or engaging the transmission. They can be pawl structures as described later, or other forms, such as two friction plates. The shift protrusion 301a controls the contact or separation of the two friction plates to control the disengagement or engagement of the transmission. Figure 1 as well as Figures 10 to 14For example, during operation, if the first limiter 3 drives the first limit shaft 301 to make its shifting protrusion 301a abut against the first clutch transmission assembly, thus connecting the power shaft 2 and the planetary carrier 603, then the sun gear 601 is not connected to the power shaft 2. The power is transmitted through the power shaft 2, and after being amplified by the planetary gear set 6, it drives the multi-stage drive gear set 7 to rotate. The second limiter 5 drives the second limit shaft 501 to make its shifting protrusion 301a abut against the third clutch transmission assembly that needs to be output, thus connecting the corresponding driven gear with the output shaft 4. Taking the shifting protrusion 301a of the second limit shaft 501 abutting against the first gear on the left in the multi-stage driven gear set 8 as an example, the power is transmitted from the first gear on the left in the multi-stage drive gear set 7 to the first gear on the left in the multi-stage driven gear set 8, and then to the output shaft 4, finally driving the chainring connected to the output shaft 4 to output. Although all stages of the multi-stage driving gear set 7 and the multi-stage driven gear set 8 are engaged in the above transmission process, only the leftmost gear of the multi-stage driven gear set 8 has a transmission relationship with the output shaft 4. The other gears on the multi-stage driven gear set 8 are idle and do not affect the transmission process. Again... Figure 1 as well as Figures 10 to 14 For example, if the first limiter 3 drives the first limit shaft 301 to make its shifting protrusion 301a abut against the second clutch transmission assembly, thus connecting the power shaft 2 with the amplification gear set; at this time, the planetary carrier 603 is not connected to the power shaft 2, and the power is transmitted through the power shaft 2, directly driving the multi-stage drive gear set 7 to rotate. The second limiter 5 drives the second limit shaft 501 to make its shifting protrusion 301a abut against the third clutch transmission assembly that needs to be output, thus connecting the corresponding driven gear with the output shaft 4. Taking the shifting protrusion 301a of the second limit shaft 501 abutting against the first gear on the left in the multi-stage driven gear set 8 as an example, at this time the power is transmitted from the first gear on the left in the multi-stage drive gear set 7 to the first gear on the left in the multi-stage driven gear set 8 and then to the output shaft 4, finally driving the chainring connected to the output shaft 4 to output. Although the multi-stage driving gear set 7 and the multi-stage driven gear set 8 are engaged at each stage in the above transmission process, only the first gear on the left side of the multi-stage driven gear set 8 has a transmission relationship with the output shaft 4. The other gears on the multi-stage driven gear set 8 are idle. Similarly, the planet carrier 603 and the power shaft 2 do not have a transmission relationship, and the planet carrier 603 is also idle, which does not affect the transmission process.

[0087] In summary, when both the multi-stage driving gear set 7 and the multi-stage driven gear set 8 are three-stage, the drive shaft 2, connected to the planet carrier 603 or the sun gear 601, can provide two different input speeds. The output shaft 4, connected to each stage of the three-stage driven gear set, can provide a different output speed. The entire system can provide 2 x 3 = 6 different speed changes. Similarly, when both the multi-stage driving gear set 7 and the multi-stage driven gear set 8 are four-stage, they can provide 2 x 4 = 8 different speed changes. The same logic applies to other number of stages, and will not be elaborated further.

[0088] 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 power shaft 2 and the output shaft 4, and the ratchet structure is disposed on each stage of the planetary carrier 603, the amplifying gear set, and the multi-stage driven gear set 8. The pawl is connected to a spring plate. When the pawl is not abutted by the shift protrusion 301a, 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 301a, it is in an extended state, and the corresponding clutch transmission assembly is connected.

[0089] In this embodiment, as Figure 1 and Figure 5 As shown, taking the first clutch transmission assembly on the power shaft 2 as an example, multiple pawl grooves are provided on the power shaft 2 at positions corresponding to the planetary carrier 603. Multiple pawls are correspondingly installed in the pawl grooves, and one end of a spring is connected to the pawl. The other end of the spring is fixed to the power shaft 2. When the pawl is not abutted by the shift protrusion 301a, it is compressed by the spring and is in a retracted state; when the pawl is abutted by the shift protrusion 301a, it is in an extended state. The inner ring of the planetary carrier 603 is provided with a ratchet structure, such as... Figure 1 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.

[0090] Reference Figure 7 and Figure 8 In some embodiments, the first limiter 3 further includes: a slide bar 302, a connecting seat 303, and a drive pin 304;

[0091] The connecting seat 303 has a through hole 3031 that is not less than the diameter of the drive shaft and not greater than the length of the slide bar 302. The side wall of the through hole 3031 has an annular groove 3032 that can accommodate the slide bar 302. The bottom of the annular groove 3032 has a mounting hole 3033 that communicates with the outside of the connecting seat 303.

[0092] The power shaft 2 has a pair of sliding grooves 202. One end of the drive pin 304 is sealed and slidably connected to the first oil cylinder 1011 on the housing 1, and the other end is connected to one side of the connecting seat 303. The connecting seat 303 is sleeved on the power shaft 2. The slide rod 302 is inserted into the connecting seat 303 through the mounting hole 3033 and passes through one sliding groove 202 to connect to the first limiting shaft 301 and then passes through the other sliding groove 202. The slide rod 302 is located in the annular groove 3032 and can rotate with the power shaft 2 in the annular groove 3032.

[0093] In this embodiment, the connecting seat 303 can be a block structure with a through hole 3031 in the middle, which is approximately the same diameter as the output shaft 4. The inner wall of the through hole 3031 is provided with an annular groove 3032 with a diameter not less than that of the slide rod 302, so that the slide rod 302 can rotate within the annular groove 3032. To facilitate the installation of the slide rod 302, the bottom of the annular groove 3032 is also provided with a mounting hole 3033 that connects to the outside of the connecting seat 303, so that the slide rod 302 can be inserted into the annular groove 3032 from the mounting hole 3033. Correspondingly, the power shaft 2 is provided with a pair of sliding grooves 202. These sliding grooves 202 can be oval, with their length direction the same as that of the power shaft 2, and the center line of the sliding grooves 202 located on the diameter line of the power shaft 2. During connection, one end of the drive pin 304 is sealed and slidably connected to the first hydraulic cylinder 1011 on the housing 1, and the other end is connected to one side of the connecting seat 303. The connecting seat 303 is sleeved on the power shaft 2. The slide rod 302 is inserted into the connecting seat 303 through the mounting hole 3033, passes through a slide groove 202 to connect to the first limiting shaft 301, and then passes through another slide groove 202. The slide rod 302 and the first limiting shaft 301 can be threaded together for easy positioning. The slide rod 302 is located in the annular groove 3032 and can rotate with the power shaft 2 within the annular groove 3032. That is, the first hydraulic cylinder 1011 can drive the drive pin 304, thereby driving the connecting seat 303 and the slide rod 302 within the connecting seat 303 to move in the length direction of the power shaft 2. In turn, the slide rod 302 can drive the first limiting shaft 301 to move inside the power shaft 2, so that the shifting protrusion 301a on the first limiting shaft 301 abuts against the required clutch transmission component.

[0094] Reference Figure 9 In some embodiments, the second limiter 5 further includes a slide cylinder 502;

[0095] One end of the slide cylinder 502 is inserted into and seals the second oil cylinder 1021 on the sliding connection housing 1, and the other end of the slide cylinder 502 extends into the output shaft 4 to connect to the second limit shaft 501.

[0096] In this embodiment, since only one end of the output shaft 4 protrudes from the housing 1 to output power to the crankset, the second limiter 5 can be completely inserted into the output shaft 4. At this time, one end of the slide cylinder 502 is inserted into and seals the sliding connection of the second hydraulic cylinder 1021 on the housing 1, and the other end of the slide cylinder 502 extends into the output shaft 4 to connect to the second limiter shaft 501. Specifically, the first hydraulic cylinder 1011 and the second hydraulic cylinder 1021 are both integrally formed cavity structures on the housing 1. The cavity structure is provided with an internal interface and an external interface. The internal interface is used to connect the drive needle 304 or the slide cylinder 502, and the external interface is used to connect to the external oil circuit. Sealing rings are provided in both the internal and external interfaces to ensure the sealing effect of the cavity structure and prevent oil leakage.

[0097] Reference Figure 1 and Figure 3 In some embodiments, the multi-stage driving wheel group 7 includes: a first driving wheel 701, a second driving wheel 702 and a third driving wheel 703; the multi-stage driven wheel group 8 includes: a first driven wheel 801, a second driven wheel 802 and a third driven wheel 803;

[0098] The first driving wheel 701 is axially provided with a first connecting part 7011, and the second driving wheel 702 and the third driving wheel 703 are sequentially sleeved and fixed on the first connecting part 7011; the sun wheel 601 is axially provided with a second connecting part 6011, and the second connecting part 6011 is fixedly connected to the first connecting part 7011.

[0099] The first driving wheel 701 and the first driven wheel 801 are engaged, the second driving wheel 702 and the second driven wheel 802 are engaged, and the third driving wheel 703 and the third driven wheel 803 are engaged.

[0100] In some embodiments, the first connecting part 7011 is a structure with a stepped external gear ring and an internal thread connected to the first driving wheel 701 in the axial direction, and the second connecting part 6011 is a cylindrical structure with an external thread connected to the sun wheel 601 in the axial direction. The first connecting part 7011 and the second connecting part 6011 are threadedly connected.

[0101] In this embodiment, the structure of the first driving wheel 701 can be similar to a stepped three-gear, while the second driving wheel 702 and the third driving wheel 703 are fitted onto the steps of this three-gear to form a whole. The overall angular velocity is consistent during movement.

[0102] In some embodiments, the transmission system further includes a plurality of support bearings 9, with a support bearing 9 provided between the first drive wheel 701 and the power shaft 2; a support bearing 9 provided between the first driven wheel 801 and the output shaft 4; and a support bearing 9 provided between the third driven wheel 803 and the output shaft 4. A first limiting ring 801a is provided on one side wall of the first driven wheel 801 and a first limiting ring 802a is provided on the other side wall of the second driven wheel 802 and a second limiting ring 802a is provided on one side wall of the third driven wheel 803. The first limiting ring 801a on the side wall of the first driven wheel 801 and the second limiting ring 802a on the side wall of the second driven wheel 802 are movably sleeved together. The first limiting ring 801a on the side wall of the second driven wheel 802 and the second limiting ring 802a on the side wall of the third driven wheel 803 are movably sleeved together.

[0103] In this embodiment, since the power shaft 2 only has a transmission relationship with the planetary carrier 603 or only with the amplification gear set when it moves, a support bearing 9 is set between the first driving gear 701 and the power shaft 2. The whole formed by the planetary gear set 6 and the multi-stage driving gear set 7 has two support points: the support bearing 9 and the planetary carrier 603. The rotation is smoother and the system sway is avoided. Similarly, when the output shaft 4 is in motion, it only has a transmission relationship with one gear in the multi-stage driven gear set 8, while the gears in the other multi-stage driven gear sets 8 are idling. A support bearing 9 is provided between the first driven gear 801 and the output shaft 4, and another support bearing 9 is provided between the third driven gear 803 and the output shaft 4. In this configuration, both the first driven gear 801 and the third driven gear 803 can be provided with a convex ring to connect to the support bearing 9. Then, the first limiting ring 801a and the second limiting ring 802a are movably sleeved, so that the gears in the multi-stage driven gear set 8 do not interfere with each other when rotating. This enables direct transmission connection between the multi-stage driving gear set 7 and the multi-stage driven gear set 8 without the need for additional transmission structures to assist in the connection.

[0104] Reference Figure 3 In some embodiments, the first drive wheel 701 has a groove 701a facing the slide bar 302, and a pair of slide grooves 202 on the drive shaft 2 are at least partially located in the groove 701a.

[0105] In this embodiment, the first drive wheel 701 has a groove 701a facing the slide bar 302. A pair of slide grooves 202 on the drive shaft 2 are at least partially located in the groove 701a. This structure can make greater use of space in the axial direction of the drive shaft 2. That is, the connecting seat 303 can be in the groove 701a when it moves, saving space and reducing volume.

[0106] Reference Figure 1 and Figure 2 as well as Figure 10 In some embodiments, the housing 1 includes a left cover 102, a right cover 101, and a middle shell 103 with openings at both ends;

[0107] One end of the power shaft 2 passes through the left cover 102 and is connected to the left cover 102 through a bearing, and the other end passes through the right cover 101 and is connected to the right cover 101 through a bearing. The first oil cylinder is located on the right cover 101.

[0108] The second oil cylinder is mounted on the left cover 102; one end of the output shaft 4 is connected to the left cover 102 via a bearing, and the interface of the second oil cylinder connecting to the slide 502 is located inside the output shaft 4, while the other end passes through the right cover 101 and is connected to the right cover 101 via a bearing.

[0109] The left cover 102 and the middle shell 103 are connected by an open seal at one end, and the right cover 101 and the middle shell 103 are connected by an open seal at the other end.

[0110] In this embodiment, the entire transmission structure of the above-described transmission system is sealed inside the housing 1. The interfaces between the power shaft 2 and the left cover 102 and right cover 101 can be sealed with sealing caps, and sealing rings are provided inside the sealing caps for further sealing. The interface of the hydraulic cylinder is also sealed with a sealing ring of a similar structure. During use, it can prevent mud, sand, dust, and other objects from entering the transmission system and contaminating or even affecting the use of the transmission structure. At the same time, it can achieve the effect of no cleaning and no maintenance. After installing the transmission system of this utility model, even when riding on muddy roads, there is no fear that the system will be damaged by foreign objects entering it, which is especially suitable for mountain bikes.

[0111] Example 2:

[0112] like Figure 15 and Figure 16 As shown, the first limiter 3 further includes: a cylinder seat 305 and a third cylinder 306 mounted on the cylinder seat 305; the cylinder seat 305 is fixed to the housing 1, and the third cylinder 306 penetrates the housing 1 and is inserted into the power shaft 2; the end of the first limiter shaft 301 away from the shift protrusion 301a is sealed and slidably connected to the third cylinder 306. Specifically, the cylinder seat 305 is provided with a connecting ear, which fixes the cylinder seat 305 to the housing 1. The third cylinder 306 penetrates the housing 1 and is inserted into the power shaft 2. There is a gap between the third cylinder 306 and the power shaft 2, so that the power shaft 2... The rotation will not interfere with the normal operation of the third cylinder 306. By embedding the third cylinder 306 inside the power shaft 2 and driving the movement of the first limit shaft 301, the shift protrusion and any stage of the first clutch transmission assembly can be connected. The embedded method makes the internal space of the housing 1 more compact, which is conducive to miniaturizing the transmission system. Alternatively, other transmission structures can be set outside the power shaft 2 to achieve different reversing purposes, such as the reversing structure described in Embodiment 3 later. In addition, the second limiter 5 on the output shaft 4 can adopt the same structure as the first limiter 3 in this embodiment.

[0113] Example 3:

[0114] like Figure 17As shown, this embodiment only describes the parts that differ from Embodiment 1. In this embodiment, the transmission system also includes an input shaft 11, on which an input gear 110 is provided. The input gear 110 meshes with any stage of the multi-stage drive wheel set 7, and both ends of the input shaft 11 extend out of the housing 1 to form second power input ends 111. Unlike Embodiment 1, the two ends of the power shaft 2 do not extend out of the housing 1. The second power input ends 111 at both ends of the input shaft 11 are connected to the bicycle pedals to provide power to the transmission system. Correspondingly, the input gear 110 is coaxially mounted on the input shaft 11. The input gear 110 is used to mesh with any stage of the multi-stage drive wheel set 7. When the power passes through the second power input end 111 and drives the input shaft 11 to rotate, the input gear 110 meshes with any stage of the multi-stage drive wheel set 7, causing the direction of the multi-stage drive wheel set 7 to be opposite to the direction of the input shaft 11. Since the multi-stage drive wheel set 7 also needs to mesh with the multi-stage driven wheel set 8 to transmit power, a second process is performed here. The steering is changed so that the first power output end 401 on the output shaft 4 turns in the same direction as the second power input end 111. In this embodiment, the steering is changed by setting different shafts for the power shaft 2 and the input shaft 11. The input gear 110 mounted on the input shaft 11 meshes with the multi-stage drive gear set 7 on the power shaft 2, so that the first power output end 401 turns in the same direction as the second power input end 111. This is different from the first embodiment where the first power output end 401 turns in the opposite direction to the first power input end 201. In practical applications, a transmission system with a corresponding structure can be selected to adapt to different application scenarios. In addition, since the power shaft 2 needs to perform external gear meshing transmission with the input shaft 11 in this embodiment, the external space of the power shaft 2 is occupied. In this case, the first limiter 3 and the second limiter 5 in this embodiment can adopt the structure as in the second embodiment, that is, adopt an internal hydraulic cylinder structure to make full use of the space inside the power shaft 2 and the output shaft 4.

[0115] Example 4:

[0116] like Figure 18 and Figure 19 As shown, the output shaft 4 includes a first reversing gear set 41, which includes multiple reversing planetary gears 410, a transmission frame 411, and a first output cylinder 412.

[0117] The transmission frame 411 is provided with an axially misaligned internal gear ring 4110 and a connecting ring 4111. The transmission frame 411 is fixed to the output shaft 4 by the connecting ring 4111. Multiple reversing planetary gears 410 are mounted on the housing 1 and mesh with the internal gear ring 4110. The first output cylinder 412 is rotatably mounted on the output shaft 4. One end of the first output cylinder 412 is provided with an external tooth 4120 for meshing with the reversing planetary gear 410. The other end of the first output cylinder 412 passes through the housing 1 and is provided with a second power output end 4121.

[0118] Specifically, when this transmission system is applied to a bicycle, the second power output end 4121 of the first output cylinder 412 can be used to mount the chainring; the inner wall of the connecting ring 4111 of the transmission frame 411 is provided with a spline structure, and the outer wall of the output shaft 4 is provided with a transmission spline connected to the connecting ring 4111. Through the spline connection, the rotation of the output shaft 4 can drive the transmission frame 411 to drive together. Furthermore, since multiple reversing planetary gears 410 are mounted on the housing 1, and the first output cylinder 412 is rotatably mounted on the output shaft 4, this allows for… Power is input through the transmission frame 411, transmitted by multiple reversing planetary gears 410, and finally output through the first output cylinder 412. This method makes the rotation of the first output cylinder 412 opposite to the rotation of the output shaft 4. Since the output shaft 4 and the power shaft 2 are driven by external gear meshing, after the transmission through the first reversing gear set 41, the rotation of the first output cylinder 412 is the same as the rotation of the power shaft 2. That is, in this embodiment, the rotation of the chainring mounted on the first output cylinder 412 is the same as the rotation of the power shaft 2.

[0119] Example 5:

[0120] like Figure 20 and Figure 21 As shown, the output shaft 4 includes a second reversing gear set 42, which includes a transmission gear 420 and a second output cylinder 421. The transmission gear 420 is coaxially fixed on the output shaft 4. The second output cylinder 421 is rotatably mounted on the power shaft 2, and one end of the second output cylinder 421 is provided with an output gear 4210 that meshes with the transmission gear 420. The other end of the second output cylinder 421 passes through the housing 1 and is provided with a third power output end 4211.

[0121] Specifically, when this gear system is applied to a bicycle, the third power output end 4211 of the second output cylinder 421 is used to connect to the chainring. The second output cylinder 421 is coaxially mounted on the power shaft 2 through bearings, so that the rotation of the power shaft 2 and the rotation of the second output cylinder 421 do not interfere with each other. The transmission gear 420 is coaxially fixed on the output shaft 4 using a spline connection, so that the output shaft 4 can drive the transmission gear 420 to rotate together. The transmission gear 420 and the output gear 4210 mesh with each other, so that the direction of the third power output end 4211 is opposite to the direction of the output shaft 4. Specifically, it can be compared with the first power output end 401 on the output shaft 4 in Embodiment 1. In this embodiment, the setting of the second reversing gear set 42 achieves the purpose of reversing the third power output end 4211. In summary, the power in this embodiment is provided via the first power input end 201 fixed at both ends of the power shaft 2, which drives the power shaft 2 to rotate. The power is then transmitted to the output shaft 4 through the multi-stage driving gear set 7 and the multi-stage driven gear set 8. The torque and speed after multi-stage speed change are transmitted to the transmission gear 420 through the output shaft 4. The transmission gear 420 meshes with the output gear 4210 to achieve reversal. Finally, the power is transmitted out through the third power output end 4211 fixed to the second output cylinder 421.

[0122] 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 above.

[0123] 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: The housing, a power 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; Both the power shaft and the output shaft are rotatably connected to the housing, and the power shaft has a first power input end with both ends extending out of the housing, and the output shaft has a first power output end with one end extending out of the housing; The sun gear of the planetary gear set is coaxially and fixedly connected with the multi-stage driving gear set to form an amplifying gear set. The internal gear ring is fixed on the housing. The planet carrier, sun gear and multi-stage driving gear set of the planetary gear set can all be rotatably mounted on the power shaft. A first clutch transmission assembly is provided between the power shaft and the planet carrier, and a second clutch transmission assembly is provided between the power shaft and the amplifying gear set. The multi-stage driven wheel assembly is rotatably mounted on the output shaft, and a third clutch transmission assembly is provided between the output shaft and each stage of the multi-stage driven wheel assembly; The first limiter has a movable first limit shaft extending into the power 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 the first clutch transmission assembly, thereby connecting the power shaft and the planetary carrier; or it can drive the first limit shaft so that its shifting protrusion abuts against the second clutch transmission assembly, thereby connecting the power shaft and the amplification gear set. The second limiter can drive the second limit shaft so that its shifting protrusion abuts against any of the third clutch transmission assemblies, thereby connecting its corresponding driven gear and the output shaft.

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 power shaft and the output shaft, and the ratchet structures are mounted on each stage of the planetary carrier, the amplification gear set, and the multi-stage driven 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 also includes: a slide bar, a connecting seat, and a drive pin; The connecting seat has a through hole that is not less than the diameter of the drive shaft and not greater than the length of the slide rod. The sidewall of the through hole has an annular groove that can accommodate the slide rod. The bottom of the annular groove has a mounting hole that connects to the outside of the connecting seat. The power shaft has a pair of sliding grooves. One end of the drive pin is sealed and slidably connected to the first oil cylinder on the housing, and the other end is connected to one side of the connecting seat. The connecting seat is sleeved on the power shaft. The slide rod is inserted into the connecting seat through the mounting hole and passes through one sliding groove to connect to the first limiting shaft and then passes through the other sliding groove. The slide rod is located in the annular groove and can rotate with the power shaft in the annular groove.

4. The transmission system according to claim 3, characterized in that, The second limiter also includes: a slide cylinder; One end of the slide tube is inserted into and seals the second oil cylinder on the sliding connection housing, and the other end of the slide tube extends into the inside of the output shaft to connect to the second limiting shaft.

5. The transmission system according to claim 4, 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 driving wheel is axially provided with a first connecting part, and the second driving wheel and the third driving wheel are sequentially sleeved and fixed on the first connecting part; the sun wheel is axially provided with a second connecting part, and the second connecting part is 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.

6. The transmission system according to claim 5, characterized in that, The first connecting part is a structure with a stepped external gear ring and internal threads connected to the first driving wheel axis, and the second connecting part is a cylindrical structure with external threads connected to the sun wheel axis. The first connecting part and the second connecting part are threadedly connected.

7. The transmission system according to claim 6, characterized in that, The transmission system also includes multiple support bearings. One support bearing is provided between the first driving wheel and the power shaft; one support bearing is provided between the first driven wheel and the output shaft; and one support bearing is provided between the third driven wheel and the output shaft. A first limiting ring is provided on one side wall of the first driven wheel and one side wall of the second driven wheel, and a second limiting ring is provided on the other side wall of the second driven wheel and one side wall of the third driven wheel. The first limiting ring on the side wall of the first driven wheel and the second limiting ring on the side wall of the second driven wheel are movably sleeved together. The first limiting ring on the side wall of the second driven wheel and the second limiting ring on the side wall of the third driven wheel are movably sleeved together.

8. The transmission system according to claim 5, characterized in that, The first drive wheel has a groove facing the slide bar side, and a pair of grooves on the drive shaft are at least partially located within the groove.

9. The transmission system according to claim 4, characterized in that, The housing includes a left cover, a right cover, and a middle shell with openings at both ends; One end of the power shaft passes through the left cover and is connected to the left cover via a bearing, and the other end passes through the right cover and is connected to the right cover via a bearing, wherein the first hydraulic cylinder is disposed on the right cover; The second hydraulic cylinder is mounted on the left cover; one end of the output shaft is connected to the left cover via a bearing, and the interface of the second hydraulic cylinder connecting to the slide is located inside the output shaft, while the other end passes through the right cover and is connected to the right cover via a bearing. The left cover and the middle shell are connected by an opening at one end and are sealed together, while the right cover and the middle shell are connected by an opening at the other end and are sealed together.

10. The transmission system according to claim 1, characterized in that, The first limiter also includes: a cylinder seat and a third cylinder mounted on the cylinder seat; The cylinder seat is fixed to the housing, and the third cylinder penetrates the housing and is inserted into the power shaft; The end of the first limiting shaft away from the shifting protrusion is sealed and slidably connected to the third oil cylinder.

11. The transmission system according to claim 1, characterized in that, The output shaft includes a first reversing gear set, which includes multiple reversing planetary gears, a transmission frame, and a first output cylinder. The transmission frame is provided with an axially misaligned internal gear ring and a connecting ring, and the transmission frame is fixed to the output shaft by the connecting ring; multiple reversing planetary gears are mounted on the housing, and the reversing planetary gears mesh with the internal gear ring; the first output cylinder is rotatably mounted on the output shaft, and one end of the first output cylinder is provided with an external tooth for meshing with the reversing planetary gear, and the other end of the first output cylinder passes through the housing and is provided with a second power output end.

12. The transmission system according to claim 1, characterized in that, The output shaft includes a second reversing gear set, which includes a transmission gear and a second output cylinder. The transmission gear is coaxially fixed on the output shaft; The second output cylinder is rotatably mounted on the power shaft, and one end of the second output cylinder is provided with an output gear that meshes with the transmission gear, while the other end of the second output cylinder passes through the housing and is provided with a third power output end.

13. A transmission system, characterized in that, include: Housing, input shaft, at least partially hollow power shaft, first limiter, at least partially hollow output shaft, second limiter, planetary gear set, multi-stage driving gear set, multi-stage driven gear set; The input shaft, power shaft, and output shaft are all rotatably connected to the housing, and the input shaft has a second power input end with both ends extending out of the housing, and the output shaft has a first power output end with one end extending out of the housing; The sun gear of the planetary gear set is coaxially and fixedly connected with the multi-stage driving gear set to form an amplifying gear set. The internal gear ring is fixed on the housing. The planet carrier, sun gear and multi-stage driving gear set of the planetary gear set can all be rotatably mounted on the power shaft. A first clutch transmission assembly is provided between the power shaft and the planet carrier, and a second clutch transmission assembly is provided between the power shaft and the amplifying gear set. The input shaft is equipped with an input gear, which meshes with any one stage of the multi-stage drive gear set. The multi-stage driven wheel assembly is rotatably mounted on the output shaft, and a third clutch transmission assembly is provided between the output shaft and each stage of the multi-stage driven wheel assembly; The first limiter has a movable first limit shaft extending into the power 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 the first clutch transmission assembly, thereby connecting the power shaft and the planetary carrier; or it can drive the first limit shaft so that its shifting protrusion abuts against the second clutch transmission assembly, thereby connecting the power shaft and the amplification gear set. The second limiter can drive the second limit shaft so that its shifting protrusion abuts against any of the third clutch transmission assemblies, thereby connecting its corresponding driven gear and the output shaft.

14. A bicycle, characterized in that, The bicycle includes the transmission system as described in any one of claims 1 to 13.

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