Speed change system and bicycle

Abstract

The invention 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 to 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] The present invention relates to the technical field of bicycle speed change systems, and in particular to a speed change system and a bicycle. Background Art

[0002] A Chinese patent with publication number CN113401274A discloses a gearbox in a bicycle mid-shaft, comprising a housing, an input shaft, an output shaft and a speed change unit. Both ends of the input shaft are connected to bicycle pedals, the output shaft is connected to wheels, the input shaft and the output shaft are connected via a speed change unit, the speed change unit comprises a driving gear unit, a driven gear unit, a transmission gear unit and a speed change gear unit, the speed change gear unit comprises a speed change driving gear, a speed change driven gear, a number of driving speed change fork rods that is consistent with the number of driving gears and a number of driven speed change fork rods that is consistent with the number of driven gears, the speed change driving gear is provided with a driving jack, and the speed change driven gear is provided with a driven slot.

[0003] Since the above-mentioned gearbox includes not only a driving gear set and a driven gear set, but also a transmission gear set and a speed change gear set, the entire gearbox has a complex structure, and is relatively heavy and large in size. Summary of the invention

[0004] In view of this, the present invention provides a speed change system and a bicycle, which are used to solve the problems of the prior art that the gearbox of the bicycle is complex in structure, heavy in weight and large in volume.

[0005] To achieve one or part or all of the above purposes or other purposes, the present invention provides 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 wheel set, and a multi-stage driven wheel set;

[0006] The power shaft and the output shaft can be 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 fixedly connected with the multi-stage driving gear set to form an amplifying gear set, the inner gear ring is fixed on the housing, the planet carrier, the sun gear and the multi-stage driving gear set of the planetary gear set can be rotatably arranged on the power shaft, and a first clutch transmission assembly is arranged between the power shaft and the planet carrier, and a second clutch transmission assembly is arranged between the power shaft and the amplifying gear set;

[0008] 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;

[0009] The first limiter has a movable first limiter shaft extending into the interior of the power shaft, and the second limiter has a movable second limiter shaft extending into the interior of the output shaft; both the first limiter shaft and the second limiter shaft have a shifting convex portion;

[0010] The first limiter can drive the first limiter shaft to make its shift protrusion abut against the first clutch transmission component to achieve a transmission connection between the power shaft and the planetary carrier, or drive the first limiter shaft to make its shift protrusion abut against the second clutch transmission component to achieve a transmission connection between the power shaft and the amplifying wheel group; the second limiter can drive the second limiter shaft to make its shift protrusion abut against any of the third clutch transmission components to achieve a transmission connection between its corresponding driven wheel and the output shaft.

[0011] Furthermore, 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 arranged on the power shaft and the output shaft, the ratchet structure is arranged on each level of the planetary carrier, the amplifying wheel set and the multi-stage driven wheel set, and the pawl is connected to a spring sheet, and the pawl is compressed by the spring sheet and is in a retracted state when not abutted by the shift convex portion, and the corresponding clutch transmission assembly is not connected; the pawl is in an extended state when abutted by the shift convex portion, and the corresponding clutch transmission assembly is transmission connected.

[0012] Furthermore, the first stopper further comprises: a slide bar, a connecting seat and a driving needle;

[0013] The connecting seat has a through hole that is not less than the diameter of the driving shaft and not greater than the length of the sliding rod. The side wall of the through hole has an annular groove that can accommodate the sliding rod. The bottom of the annular groove has a mounting hole that is connected to the outside of the connecting seat.

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

[0015] Furthermore, the second limiter further comprises: a slide cylinder;

[0016] One end of the slide cylinder is inserted into and sealed in a sliding connection with a second oil cylinder on the housing, and the other end of the slide cylinder extends into the interior of the output shaft to connect with the second limiting shaft.

[0017] Further, the multi-stage driving wheel group includes: a first driving wheel, a second driving wheel and a third driving wheel; the multi-stage driven wheel group includes: a first driven wheel, a second driven wheel and a third driven wheel;

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

[0019] The first driving wheel is meshed with the first driven wheel, the second driving wheel is meshed with the second driven wheel, and the third driving wheel is meshed with the third driven wheel.

[0020] Furthermore, the first connection part is a structure having a stepped outer gear ring and an internal thread connected to the axial direction of the first driving wheel, and the second connection part is a tubular structure having an external thread connected to the axial direction of the sun gear, and the first connection part and the second connection part are threadedly connected.

[0021] Furthermore, the transmission system also includes multiple support bearings, one of the support bearings is arranged between the first driving wheel and the power shaft; one of the support bearings is arranged between the first driven wheel and the output shaft; one of the support bearings is arranged between the third driven wheel and the output shaft; one side wall of the first driven wheel and one side wall of the second driven wheel are both provided with a first limiting ring, the other side wall of the second driven wheel and one side wall of the third driven wheel are both provided with a second limiting ring, 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 connected, and 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 connected.

[0022] Furthermore, the first driving wheel has a groove facing one side of the slide rod, and the pair of slide grooves on the power shaft are at least partially located in the groove.

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

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

[0025] Wherein, the second oil cylinder is arranged on the left cover; one end of the output shaft is connected to the left cover through a bearing, and the interface of the second oil cylinder connecting the slide cylinder is located inside the output shaft, and the other end passes through the right cover and is connected to the right cover through a bearing;

[0026] The left cover is sealedly connected to an opening at one end of the middle shell, and the right cover is sealedly connected to an opening at the other end of the middle shell.

[0027] Furthermore, the first limiter further comprises: a cylinder seat, and a third cylinder arranged on the cylinder seat;

[0028] The cylinder seat is fixed on the housing, and the third cylinder penetrates the housing and is inserted into the power shaft; one end of the first limit shaft away from the shifting convex portion is sealingly and slidably connected to the third cylinder.

[0029] Further, the speed change system according to claim 1 is characterized in that the output shaft comprises a first reversing gear set, the first reversing gear set comprises a plurality of reversing planetary gears, a transmission frame and a first output cylinder;

[0030] The transmission frame is provided with an axially dislocated inner gear ring and a connecting ring, and the transmission frame is fixed to the output shaft through the connecting ring; a plurality of reversing planetary gears are mounted on the housing, and the reversing planetary gears are meshed with the inner 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 outer gear portion 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.

[0031] Further, the output shaft includes a second reversing gear set, and the second reversing gear set includes a transmission gear and a second output cylinder;

[0032] The transmission gear is coaxially fixed on the output shaft;

[0033] The second output cylinder is rotatably sleeved on the power shaft, and one end of the second output cylinder is provided with an output gear meshing with the transmission gear, and the other end of the second output cylinder passes through the shell and is provided with a third power output end.

[0034] A speed change system comprises: a housing, an input shaft, a power shaft which is at least partially hollow, a first stopper, an output shaft which is at least partially hollow, a second stopper, a planetary gear set, a multi-stage driving wheel set, and a multi-stage driven wheel set;

[0035] The input shaft, the power shaft and the output shaft can all be 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;

[0036] The sun gear of the planetary gear set is coaxially fixedly connected with the multi-stage driving gear set to form an amplifying gear set, the inner gear ring is fixed on the housing, the planet carrier, the sun gear and the multi-stage driving gear set of the planetary gear set can be rotatably arranged on the power shaft, and a first clutch transmission assembly is arranged between the power shaft and the planet carrier, and a second clutch transmission assembly is arranged between the power shaft and the amplifying gear set;

[0037] An input gear is provided on the input shaft, and the input gear is meshed with any one stage of the multi-stage driving wheel set;

[0038] 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;

[0039] The first limiter has a movable first limiter shaft extending into the interior of the power shaft, and the second limiter has a movable second limiter shaft extending into the interior of the output shaft; both the first limiter shaft and the second limiter shaft have a shifting convex portion;

[0040] The first limiter can drive the first limiter shaft to make its shift protrusion abut against the first clutch transmission component to achieve a transmission connection between the power shaft and the planetary carrier, or drive the first limiter shaft to make its shift protrusion abut against the second clutch transmission component to achieve a transmission connection between the power shaft and the amplifying wheel group; the second limiter can drive the second limiter shaft to make its shift protrusion abut against any of the third clutch transmission components to achieve a transmission connection between its corresponding driven wheel and the output shaft.

[0041] To achieve one, part, or all of the above purposes or other purposes, the present invention further provides a bicycle, comprising the speed change system described in any one of the above.

[0042] Implementing the embodiments of the present invention will have the following beneficial effects:

[0043] After adopting the above-mentioned speed change system, since the core transmission components of the speed change system only include a planetary gear set, a multi-stage driving wheel set and a multi-stage driven wheel set; the transmission process is adjusted by a first limiting shaft arranged inside the power shaft and a second limiting shaft arranged inside the output shaft, and the multi-stage driving wheel set and the multi-stage driven wheel set are directly transmitted, and no additional space is required to arrange the transmission gear set and the speed change gear set, thereby optimizing the transmission process, simplifying the gearbox structure of the bicycle, and making the weight and volume smaller. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0045] in:

[0046] Figure 1 An exploded view of the structure of a speed change system in one embodiment of the present invention;

[0047] Figure 2 It is a structural exploded diagram of a speed change system in another embodiment of the present invention;

[0048] Figure 3 It is a structural exploded diagram of a speed change system in another embodiment of the present invention;

[0049] Figure 4 This is a schematic diagram of the structure of a first driving wheel in one embodiment of the present invention;

[0050] Figure 5 It is a schematic diagram of the structure of a power shaft in one embodiment of the present invention;

[0051] Figure 6 It is a schematic diagram of the structure of an output shaft in one embodiment of the present invention;

[0052] Figure 7 It is a schematic structural diagram of a first limiter in one embodiment of the present invention;

[0053] Figure 8 for Figure 7 Another perspective of

[0054] Fig. 9 It is a schematic diagram of the structure of the second limiter in one embodiment of the present invention;

[0055] Fig.10 A structural cross-sectional view of a speed change system in one embodiment of the present invention;

[0056] Fig.11 for Fig.10 Schematic diagram of the middle BB section;

[0057] Fig.12 for Fig.10 Schematic diagram of the CC section;

[0058] Fig.13 for Fig.10 Schematic diagram of the middle DD section;

[0059] Fig.14 for Fig.10 Schematic diagram of the EE cross section;

[0060] Fig.15 This is a schematic diagram of the connection between the oil cylinder seat and the housing in the second embodiment;

[0061] Fig.16 is a schematic diagram of the overall structure of the first limiter in the second embodiment;

[0062] Fig.17 This is a schematic diagram of the separation of the overall structure in Example 3;

[0063] Fig.18 Schematic diagram of the separation of the overall structure in Example 4 Figure 1 ;

[0064] Fig.19 Schematic diagram of the separation of the overall structure in Example 4 Figure 2 ;

[0065] Fig. 20 It is a schematic diagram of the assembly of the overall structure in the fifth embodiment;

[0066] Fig.21 It is a schematic diagram of the separation of the overall structure in Example 4.

[0067] Reference numerals:

[0068] 1. Shell; 101. Right cover; 1011. First oil cylinder; 102. Left cover; 1021. Second oil cylinder; 103. Middle shell; 11. Input shaft; 110. Input gear; 111. Second power input terminal;

[0069] 2. power shaft; 201. first power input end; 202. slideway;

[0070] 3. First stopper; 301. First stopper shaft; 301a. Shift convex portion; 302. Sliding rod; 303. Connecting seat; 3031. Through hole; 3032. Annular groove; 3033. Mounting hole; 304. Driving needle; 305. Cylinder seat; 306. Third cylinder;

[0071] 4. output shaft; 401. first power output end; 41. first reversing gear set; 410. reversing planetary gear; 411. transmission frame; 4110. inner gear ring; 4111. connecting ring; 412. first output cylinder; 4120. outer gear portion; 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;

[0072] 5. second stopper; 501. second stopper shaft; 502. slide cylinder;

[0073] 6. Planetary gear set; 601. Sun gear; 6011. Second connecting portion; 602. Internal gear ring; 603. Planet carrier;

[0074] 7. Multi-stage driving wheel set; 701. first driving wheel; 701a. groove; 7011. first connecting portion; 702. second driving wheel; 703. third driving wheel;

[0075] 8. Multi-stage driven wheel assembly; 801. first driven wheel; 801a. first limiting ring; 802. second driven wheel; 802a. second limiting ring; 803. third driven wheel;

[0076] 9. Support bearing. DETAILED DESCRIPTION

[0077] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by technicians in the technical field of the present invention; the terms used in the specification of the application herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention; the terms "including" and "having" and any variations thereof in the specification and claims of the present invention and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of the present invention or the above-mentioned drawings are used to distinguish different objects, not to describe a specific order.

[0078] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0079] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings.

[0080] Embodiment 1:

[0081] Reference Figures 1 to 14 In some embodiments, the present invention provides a speed change system, comprising: a housing 1, an at least partially hollow power shaft 2, a first stopper 3, an at least partially hollow output shaft 4, a second stopper 5, a planetary gear set 6, a multi-stage driving wheel set 7, and a multi-stage driven wheel set 8;

[0082] The power shaft 2 and the output shaft 4 are both rotatably connected to the housing 1, and 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;

[0083] The sun gear 601 of the planetary gear set 6 is coaxially fixedly connected with the multi-stage driving gear set 7 to form an amplifying gear set, the inner gear ring 602 is fixed on the housing 1, the planet carrier 603 of the planetary gear set 6, the sun gear 601 and the multi-stage driving gear set 7 can be rotatably arranged on the power shaft 2, and a first clutch transmission assembly is arranged between the power shaft 2 and the planet carrier 603, and a second clutch transmission assembly is arranged between the power shaft 2 and the amplifying gear set;

[0084] The multi-stage driven wheel set 8 is rotatably arranged on the output shaft 4, and a third clutch transmission assembly is arranged between the output shaft 4 and each stage of the multi-stage driven wheel set 8;

[0085] The first limiter 3 has a movable first limiter shaft 301 extending into the power shaft 2, and the second limiter 5 has a movable second limiter shaft 501 extending into the output shaft 4; both the first limiter shaft 301 and the second limiter shaft 501 have a shifting protrusion 301a;

[0086] The first limiter 3 can drive the first limiter shaft 301 so that its shift protrusion 301a abuts against the first clutch transmission component to achieve a transmission connection between the power shaft 2 and the planetary carrier 603, or drive the first limiter shaft 301 so that its shift protrusion 301a abuts against the second clutch transmission component to achieve a transmission connection between the power shaft 2 and the amplifying wheel group; the second limiter 5 can drive the second limiter shaft 501 so that its shift protrusion 301a abuts against any third clutch transmission component to achieve a transmission connection between its corresponding driven wheel and the output shaft 4.

[0087] In this embodiment, the power shaft 2 has a first power input end 201 with both ends extending out of the housing 1. The two first power input ends 201 are used to connect the bicycle crank and pedals, and the output shaft 4 has a first power output end 401 extending out of the housing 1. The first power output end 401 is used to connect the bicycle chainring, and the chainring is then transmitted to the wheel through a chain or the like. The multi-stage driving wheel set 7 and the multi-stage driven wheel set 8 can be a combination of multiple gears of different sizes or specifications. For example, the multi-stage driving 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 corresponding to a stage, such as Figure 1 and Figure 3 As shown, of course, it can also be a combination of four, five or six gears, or even more, or a combination of two gears, as long as these gears are guaranteed to mesh with each level of driving gear and each level of driven gear after installation. More specifically, the sun gear 601 of the planetary gear set 6 is coaxially fixedly connected with the multi-stage driving gear set 7 to form an amplifying gear set, which means that the sun gear 601 and the multi-stage driving gear set 7 are fixedly connected, and the amplifying gear set formed is a whole. When in use, the sun gear 601 and the multi-stage driving gear set 7 rotate together, that is, the angular velocity of each gear on the sun gear 601 and the multi-stage driving gear set 7 is consistent when rotating. The above-mentioned multi-stage driven gear set 8 is rotatably set on the output shaft 4, and relatively, each gear on the multi-stage driven gear set 8 is independent of each other when rotating. The first clutch transmission assembly, the second clutch transmission assembly and the third clutch transmission assembly are all assemblies that can separate or engage the transmission, and can be a ratchet structure as described later, or can be other forms, for example, in the form of two friction plates, and the gear shift convex portion 301a is used to control the contact or separation of the two friction plates to control the separation 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, so that the power shaft 2 and the planetary carrier 603 are connected in transmission, at this time, the sun gear 601 is not connected to the power shaft 2, and the power is transmitted through the power shaft 2, and after being amplified by the required planetary gear set 6, it drives the multi-stage driving wheel set 7 to rotate, and the second limiter 5 drives the second limit shaft 501 to make its shifting protrusion 301a abut against the third clutch transmission assembly required to be output, so that the corresponding driven wheel is connected in transmission with the output shaft 4. Taking the shifting protrusion 301a of the second limit shaft 501 abutting against the first gear on the left of the multi-stage driven wheel set 8 as an example, at this time, the power is transmitted from the first gear on the left of the multi-stage driving wheel set 7 to the first gear on the left of the multi-stage driven wheel set 8, and then to the output shaft 4, and finally drives the sprocket connected to the output shaft 4 to output. In the above transmission process, although the multi-stage driving wheel set 7 and the multi-stage driven wheel set 8 are all meshed, since only the first gear on the left of the multi-stage driven wheel set 8 has a transmission relationship with the output shaft 4, the other gears on the multi-stage driven wheel set 8 are idle and do not affect the transmission process. 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 shift protrusion 301a abut against the second clutch transmission assembly, so that the power shaft 2 and the amplifying wheel group are connected in transmission; 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 driving wheel group 7 to rotate, and the second limiter 5 drives the second limit shaft 501 to make its shift protrusion 301a abut against the third clutch transmission assembly required to be output, so that the corresponding driven wheel is connected in transmission to the output shaft 4. Taking the shift protrusion 301a of the second limit shaft 501 abutting against the first gear on the left of the multi-stage driven wheel group 8 as an example, at this time, the power is transmitted from the first gear on the left of the multi-stage driving wheel group 7 to the first gear on the left of the multi-stage driven wheel group 8, and then to the output shaft 4, and finally drives the output of the sprocket connected to the output shaft 4. In the above transmission process, although the multi-stage driving wheel set 7 and the multi-stage driven wheel set 8 are all meshed at all levels, since only the first gear on the left of the multi-stage driven wheel set 8 has a transmission relationship with the output shaft 4, the other gears on the multi-stage driven wheel set 8 are idling. Similarly, there is no transmission relationship between the planet carrier 603 and the power shaft 2, and the planet carrier 603 is also idling, which does not affect the transmission process.

[0088] In summary, when the multi-stage driving wheel set 7 and the multi-stage driven wheel set 8 are both three-stage, the power shaft 2 is connected to the planetary carrier 603 or the sun gear 601, which can provide two different input speeds, and the output shaft 4 is connected to each stage of the three-stage driven wheel set to obtain a different output speed. The whole system can provide 2X3=6 different speed changes. Similarly, when the multi-stage driving wheel set 7 and the multi-stage driven wheel set 8 are both four-stage, 2X4=8 different speed changes can be provided. The same is true for other stages, which will not be repeated.

[0089] 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 arranged on the power shaft 2 and the output shaft 4, and the ratchet structure is arranged on each level of the planetary carrier 603, the amplifying wheel set and the multi-stage driven wheel set 8, and the pawl is connected to a spring sheet. When the pawl is not abutted by the shift protrusion 301a, it is compressed by the spring sheet 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 for transmission.

[0090] In this embodiment, if Figure 1 and Figure 5 As shown, taking the first clutch transmission assembly on the power shaft 2 as an example, a plurality of pawl grooves are provided at positions on the power shaft 2 corresponding to the planet carrier 603, a plurality of pawls are correspondingly mounted on the pawl grooves, and one end of a spring sheet is connected to the pawl, and the other end of the spring sheet is fixed to the power shaft 2. When the pawl is not abutted by the shift convex portion 301a, it is compressed by the spring sheet and is in a contracted state; when the pawl is abutted by the shift convex portion 301a, it is in an extended state; the inner ring of the planet carrier 603 is provided with a ratchet structure, such as Figure 1 As shown, the ratchet structures on other gears are similar to the above. The above first clutch transmission assembly is a combination of a pawl and a ratchet.

[0091] Reference Figure 7 and Figure 8 , in some embodiments, the first stopper 3 further includes: a slide bar 302, a connecting seat 303 and a driving needle 304;

[0092] The connecting seat 303 has a through hole 3031 which is not less than the diameter of the driving shaft and not greater than the length of the sliding rod 302. The side wall of the through hole 3031 has an annular groove 3032 which can accommodate the sliding rod 302. The bottom of the annular groove 3032 has a mounting hole 3033 which is connected to the outside of the connecting seat 303.

[0093] The power shaft 2 has a pair of slide grooves 202, one end of the driving needle 304 is sealed and slidably connected to the first oil cylinder 1011 on the shell 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, and the sliding rod 302 is inserted into the connecting seat 303 through the mounting hole 3033 and passes through a slide groove 202 to connect to the first limit shaft 301 and then passes through another slide groove 202. The sliding rod 302 is located in the annular groove 3032 and can rotate with the power shaft 2 in the annular groove 3032.

[0094] In this embodiment, the connection seat 303 can be a block structure, with a through hole 3031 having a diameter similar to that of the output shaft 4 in the middle, and an annular groove 3032 having a diameter not less than that of the slide bar 302 is provided on the inner side wall of the through hole 3031, so that the slide bar 302 can rotate in the annular groove 3032. In order to facilitate the installation of the slide bar 302, a mounting hole 3033 connected to the outside of the connection seat 303 is also provided at the bottom of the annular groove 3032, so that the slide bar 302 can be inserted into the annular groove 3032 from the mounting hole 3033. In contrast, a pair of slide grooves 202 are provided on the power shaft 2, and the pair of slide grooves 202 can be oval in shape, with the length direction being the same as that of the power shaft 2, and the center line of the slide groove 202 is located on the diameter line of the power shaft 2. When connected, one end of the driving needle 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, and the sliding rod 302 is inserted into the connecting seat 303 through the mounting hole 3033 and passes through a slide groove 202 to connect to the first limiting shaft 301 and then passes through another slide groove 202. The sliding rod 302 and the first limiting shaft 301 can be threadedly connected to facilitate positioning. The sliding rod 302 is located in the annular groove 3032 and can rotate with the power shaft 2 in the annular groove 3032. That is, the first oil cylinder 1011 can drive the driving needle 304, and then drive the connecting seat 303 and the sliding rod 302 in the connecting seat 303 to move in the length direction of the power shaft 2, and then the sliding 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.

[0095] Reference Fig. 9 , in some embodiments, the second stopper 5 further includes: a slide cylinder 502;

[0096] One end of the slide cylinder 502 is inserted into and sealed in the sliding connection with the second oil cylinder 1021 on the housing 1 , and the other end of the slide cylinder 502 extends into the output shaft 4 to connect with the second limiting shaft 501 .

[0097] In this embodiment, since only one end of the output shaft 4 passes through the housing 1 to output power to the crankshaft, the second limiter 5 can be completely placed inside the output shaft 4. At this time, one end of the slide 502 is inserted into and sealed and slidably connected to the second oil cylinder 1021 on the housing 1, and the other end of the slide 502 extends into the output shaft 4 to connect with the second limiter shaft 501. Specifically, the first oil cylinder 1011 and the second oil cylinder 1021 are both integrally formed in a cavity structure on the housing 1, and an internal interface and an external interface are provided on the cavity structure, wherein the internal interface is used to connect the drive needle 304 or the slide 502, and the external interface is used to connect the external oil circuit, and sealing rings are provided in the internal interface and the external interface to ensure the sealing effect of the cavity structure and prevent oil leakage.

[0098] Reference Figure 1 and Figure 3 In some embodiments, the multi-stage driving wheel set 7 includes: a first driving wheel 701, a second driving wheel 702 and a third driving wheel 703; the multi-stage driven wheel set 8 includes: a first driven wheel 801, a second driven wheel 802 and a third driven wheel 803;

[0099] The first driving wheel 701 is axially provided with a first connecting portion 7011, and the second driving wheel 702 and the third driving wheel 703 are sequentially sleeved and fixed on the first connecting portion 7011; the sun wheel 601 is axially provided with a second connecting portion 6011, and the second connecting portion 6011 is fixedly connected to the first connecting portion 7011;

[0100] The first driving wheel 701 meshes with the first driven wheel 801 , the second driving wheel 702 meshes with the second driven wheel 802 , and the third driving wheel 703 meshes with the third driven wheel 803 .

[0101] In some embodiments, the first connection part 7011 is a structure having a stepped outer gear ring and an internal thread connected to the axial direction of the first driving wheel 701, and the second connection part 6011 is a tubular structure with an external thread connected to the axial direction of the sun gear 601. The first connection part 7011 and the second connection part 6011 are threadedly connected.

[0102] In this embodiment, the structure of the first driving wheel 701 can be similar to a stepped triple gear, and the second driving wheel 702 and the third driving wheel 703 are sleeved on the steps of the triple gear to form a whole. The overall angular velocity is consistent during movement.

[0103] In some embodiments, the speed change system also includes multiple support bearings 9, a support bearing 9 is provided between the first driving wheel 701 and the power shaft 2; a support bearing 9 is provided between the first driven wheel 801 and the output shaft 4; a support bearing 9 is 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 one side wall of the second driven wheel 802, and a second limiting ring 802a is provided on the other side wall of the second driven wheel 802 and 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 connected, and 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 connected.

[0104] In this embodiment, since the power shaft 2 has a transmission relationship only with the planetary carrier 603 or only with the amplifying wheel set when moving, a support bearing 9 is arranged between the first driving wheel 701 and the power shaft 2. The whole formed by the planetary gear set 6 and the multi-stage driving wheel set 7 has two supporting points, namely the support bearing 9 and the planetary carrier 603, which makes the rotation smoother and avoids system shaking. Similarly, when the output shaft 4 moves, it has a transmission relationship with only one gear in the multi-stage driven wheel group 8, and the gears in the other multi-stage driven wheel groups 8 are idling. A support bearing 9 is set between the first driven wheel 801 and the output shaft 4, and a support bearing 9 is set between the third driven wheel 803 and the output shaft 4. When setting, the first driven wheel 801 and the third driven wheel 803 can be provided with a convex ring for connecting the support bearing 9, and then movably connected through the first limiting ring 801a and the second limiting ring 802a, so that the several gears in the multi-stage driven wheel group 8 do not interfere with each other when rotating, thereby realizing direct transmission connection between the multi-stage driving wheel group 7 and the multi-stage driven wheel group 8, without the need for additional transmission structure to assist the connection.

[0105] Reference Figure 3 In some embodiments, the first driving wheel 701 has a groove 701a facing the side of the slide bar 302, and the pair of slide grooves 202 on the power shaft 2 are at least partially located in the groove 701a.

[0106] In this embodiment, the first driving wheel 701 has a groove 701a facing the side of the slide rod 302, and a pair of slide grooves 202 on the power shaft 2 are at least partially located in the groove 701a. This structural arrangement can utilize the space in the axial direction of the power shaft 2 to a greater extent, that is, the connecting seat 303 can be in the groove 701a when moving, saving space and reducing the volume.

[0107] Reference Figure 1 and Figure 2 as well as Fig.10 In some embodiments, the housing 1 includes a left cover 102, a right cover 101, and a middle housing 103 with openings at both ends;

[0108] 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, wherein the first oil cylinder is arranged on the right cover 101;

[0109] The second oil cylinder is arranged on the left cover 102; one end of the output shaft 4 is connected to the left cover 102 through a bearing, and the interface of the second oil cylinder connecting the slide 502 is located inside the output shaft 4, and the other end passes through the right cover 101 and is connected to the right cover 101 through a bearing;

[0110] The left cover 102 is sealedly connected to one end opening of the middle shell 103 , and the right cover 101 is sealedly connected to the other end opening of the middle shell 103 .

[0111] In this embodiment, the transmission structure of the entire transmission system of the above structure is sealed inside the housing 1, and the interfaces between the power shaft 2 and the left cover 102 and the right cover 101 can be sealed using a sealing cover, and a sealing ring is arranged inside the sealing cover for further sealing, and the interface of the oil cylinder is also sealed with a sealing ring of a similar structure. When in use, it can prevent objects such as mud, dust, etc. from entering the transmission system to pollute and even affect the use of the transmission structure, and at the same time, it can achieve the effect of no cleaning and maintenance. After the bicycle is installed with the speed change system of the present invention, even if it is ridden on a muddy road, there is no need to worry that the system will be damaged due to the entry of foreign objects, which is particularly suitable for mountain bikes.

[0112] Embodiment 2:

[0113] like Fig.15 and Fig.16 As shown, the first limiter 3 also includes: a cylinder seat 305, and a third cylinder 306 arranged on the cylinder seat 305; the cylinder seat 305 is fixed on 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 limit shaft 301 away from the shift convex portion 301a is sealed and slidably connected to the third cylinder 306, specifically, a connecting ear is provided on the cylinder seat 305, and the cylinder seat 305 is fixed to the housing 1 through the connecting ear, and the third cylinder 306 penetrates the housing 1 and is inserted into the power shaft 2, and there is a gap between the third cylinder 306 and the power shaft 2, so that the power shaft 2 The rotation of the third oil cylinder 306 will not interfere with the normal operation of the third oil cylinder 306. By embedding the third oil cylinder 306 in the power shaft 2 and driving the movement of the first limit shaft 301, a transmission connection is established between the shift protrusion and any level of the first clutch transmission assembly. The built-in method makes the internal space of the housing 1 more compact, which is conducive to miniaturizing the speed change system, or arranging other transmission structures outside the power shaft 2 to achieve different reversing purposes, such as the reversing structure described in the subsequent embodiment three; in addition, the second limiter 5 on the output shaft 4 can adopt the same structure as the first limiter 3 in this embodiment.

[0114] Embodiment three:

[0115] like Fig.17As shown, this embodiment only describes the part different from the first embodiment. In this embodiment, the speed change system also includes an input shaft 11, and an input gear 110 is provided on the input shaft 11. The input gear 110 is meshed with any one stage of the multi-stage driving wheel set 7, and both ends of the input shaft 11 extend out of the housing 1 to form a second power input end 111. Different from the first embodiment, the two ends of the power shaft 2 are not arranged to extend out of the housing 1. The second power input ends 111 at both ends of the input shaft 11 are connected to the pedals of the bicycle to provide power for the speed change system. Correspondingly, a coaxially assembled input gear 110 is provided on the input shaft 11. The input gear 110 is used to mesh with any one stage of the multi-stage driving wheel set 7. When the power drives the input shaft 11 to rotate through the second power input end 111, the input gear 110 meshes with any one stage of the multi-stage driving wheel set 7, so that the direction of the multi-stage driving wheel set 7 is opposite to that of the input shaft 11. Since the multi-stage driving wheel set 7 also needs to mesh with the multi-stage driven wheel set 8 to transmit power, a second The steering is changed, and finally the steering of the first power output terminal 401 arranged on the output shaft 4 is the same as the steering of the second power input terminal 111. In this embodiment, the power shaft 2 and the input shaft 11 with different axes are set, and the input gear 110 assembled on the input shaft 11 is engaged with the multi-stage driving wheel group 7 on the power shaft 2 to achieve the steering change, so that the steering of the first power output terminal 401 is the same as the steering of the second power input terminal 111, which is different from the steering of the first power output terminal 401 and the steering of the first power input terminal 201 in the first embodiment. In actual applications, a speed change system with a corresponding structure can be selected to adapt to different application scenarios; in addition, since in this embodiment, the power shaft 2 needs to be externally meshed with the input shaft 11 for gear transmission, the external space of the power shaft 2 has been occupied. In this case, the first limiter 3 and the second limiter 5 of this embodiment can adopt the structure as in the second embodiment, that is, a built-in cylinder structure is adopted to make full use of the space inside the power shaft 2 and the output shaft 4.

[0116] Embodiment 4:

[0117] like Fig.18 and Fig.19 As shown, the output shaft 4 includes a first reversing gear set 41, and the first reversing gear set 41 includes a plurality of reversing planetary gears 410, a transmission frame 411 and a first output cylinder 412;

[0118] An axially displaced inner gear ring 4110 and a connecting ring 4111 are provided on the transmission frame 411, and the transmission frame 411 is fixed to the output shaft 4 via the connecting ring 4111; a plurality of reversing planetary gears 410 are mounted on the housing 1, and the reversing planetary gears 410 are meshed with the inner gear ring 4110; a first output cylinder 412 is rotatably mounted on the output shaft 4, and one end of the first output cylinder 412 is provided with an outer gear portion 4120 for meshing with the reversing planetary gears 410, and the other end of the first output cylinder 412 passes through the housing 1 and is provided with a second power output end 4121.

[0119] Specifically, when the speed change system is applied to a bicycle, the second power output end 4121 of the first output cylinder 412 can be used to install a crankset; 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. In addition, since a plurality of reversing planetary gears 410 are installed on the housing 1, and the first output cylinder 412 is rotatably mounted on the output shaft 4, The 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 direction of the first output cylinder 412 opposite to the direction of the output shaft 4. Since the output shaft 4 and the power shaft 2 are transmitted by external gear meshing, after the transmission of the first reversing gear set 41, the direction of the first output cylinder 412 is the same as the direction of the power shaft 2, that is, in this embodiment, the direction of the chainring installed on the first output cylinder 412 is the same as the direction of the power shaft 2.

[0120] Embodiment five:

[0121] like Fig. 20 and Fig.21 As shown, the output shaft 4 includes a second reversing gear set 42, and the second reversing gear set 42 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 can be rotatably mounted on the power shaft 2, and one end of the second output cylinder 421 is provided with an output gear 4210 meshing with the transmission gear 420, and the other end of the second output cylinder 421 passes through the shell 1 and is provided with a third power output end 4211.

[0122] Specifically, when the speed change system is applied to a bicycle, the third power output end 4211 of the second output cylinder 421 is used to connect the crankset, and the second output cylinder 421 is coaxially mounted on the power shaft 2 through a bearing, so that the rotation of the power shaft 2 and the rotation of the second output cylinder 421 do not interfere with each other, and the transmission gear 420 is coaxially fixed on the output shaft 4 by a spline connection method, so that the output shaft 4 can drive the transmission gear 420 to rotate together, and the transmission gear 420 is meshed with the output gear 4210, so that the direction of the third power output end 4211 is opposite to the direction of the output shaft 4, which can be specifically compared with the first power output end 401 on the output shaft 4 in Example 1. In this embodiment, the purpose of reversing the third power output end 4211 is achieved due to the setting of the second reversing gear set 42. In summary, the power of this embodiment is provided via the first power input end 201 fixed at both ends of the power shaft 2, driving the power shaft 2 to rotate, and is transmitted to the output shaft 4 through the multi-stage driving wheel set 7 and the multi-stage driven wheel set 8. The torque and speed after multi-stage speed change are transmitted to the transmission gear 420 through the output shaft 4, and the transmission gear 420 and the output gear 4210 are meshed and transmitted to achieve reversing, and finally transmitted through the third power output end 4211 fixed on the second output cylinder 421.

[0123] To achieve one, part, or all of the above purposes or other purposes, the present invention further provides a bicycle comprising any of the above-mentioned speed change systems.

[0124] Obviously, the embodiments described above are only some embodiments of the present invention, rather than all embodiments. The preferred embodiments of the present invention are given in the accompanying drawings, but they do not limit the patent scope of the present invention. The present invention can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive. Although the present invention has been described in detail with reference to the aforementioned embodiments, for those skilled in the art, it is still possible to modify the technical solutions recorded in the aforementioned specific embodiments, or to perform equivalent replacements for some of the technical features therein. Any equivalent structure made using the contents of the specification and drawings of the present invention, directly or indirectly used in other related technical fields, is also within the scope of patent protection of the present invention.

Claims

1. A speed change system, characterized in that: include: A housing, an at least partially hollow power shaft, a first stopper, an at least partially hollow output shaft, a second stopper, a planetary gear set, a multi-stage driving wheel set, and a multi-stage driven wheel set; The power shaft and the output shaft can be 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 fixedly connected with the multi-stage driving gear set to form an amplifying gear set, the inner gear ring is fixed on the housing, the planet carrier, the sun gear and the multi-stage driving gear set of the planetary gear set can be rotatably arranged on the power shaft, and a first clutch transmission assembly is arranged between the power shaft and the planet carrier, and a second clutch transmission assembly is arranged between the power shaft and the amplifying gear set; 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 has a movable first limiter shaft extending into the interior of the power shaft, and the second limiter has a movable second limiter shaft extending into the interior of the output shaft; both the first limiter shaft and the second limiter shaft have a shifting convex portion; The first limiter can drive the first limiter shaft to make its shift protrusion abut against the first clutch transmission component to achieve a transmission connection between the power shaft and the planetary carrier, or drive the first limiter shaft to make its shift protrusion abut against the second clutch transmission component to achieve a transmission connection between the power shaft and the amplifying wheel group; the second limiter can drive the second limiter shaft to make its shift protrusion abut against any of the third clutch transmission components to achieve a transmission connection between its corresponding driven wheel and the output shaft.

2. The speed change system according to claim 1, characterized in that: 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 arranged on the power shaft and the output shaft, and the ratchet structure is arranged on each level of the planetary carrier, the amplifying wheel set and the multi-stage driven wheel set. The pawl is connected to a spring sheet. When the pawl is not abutted by the shift convex part, it is compressed by the spring sheet and is in a retracted state, and the corresponding clutch transmission assembly is not connected; when the pawl is abutted by the shift convex part, it is in an extended state, and the corresponding clutch transmission assembly is transmission connected.

3. The speed change system according to claim 1, characterized in that: The first stopper further comprises: a slide bar, a connecting seat and a driving needle; The connecting seat has a through hole that is not less than the diameter of the driving shaft and not greater than the length of the sliding rod. The side wall of the through hole has an annular groove that can accommodate the sliding rod. The bottom of the annular groove has a mounting hole that is connected to the outside of the connecting seat. The power shaft has a pair of slide grooves, one end of the driving needle is sealed and slidably connected to the first oil cylinder on the shell, and the other end is connected to one side of the connecting seat; the connecting seat is sleeved on the power shaft, and the sliding rod is inserted into the connecting seat through the mounting hole and passes through a slide groove to connect to the first limiting shaft and then passes through another slide groove. The sliding rod is located in the annular groove and can rotate with the power shaft in the annular groove.

4. The speed change system according to claim 3, characterized in that: The second stopper further comprises: a slide cylinder; One end of the slide cylinder is inserted into and sealed in a sliding connection with a second oil cylinder on the housing, and the other end of the slide cylinder extends into the interior of the output shaft to connect with the second limiting shaft.

5. The speed change system according to claim 4, characterized in that: The multi-stage driving wheel group includes: a first driving wheel, a second driving wheel and a third driving wheel; the multi-stage driven wheel group includes: a first driven wheel, a second driven wheel and a third driven wheel; The first driving wheel is axially provided with a first connecting portion, and the second driving wheel and the third driving wheel are sequentially sleeved and fixed on the first connecting portion; the sun wheel is axially provided with a second connecting portion, and the second connecting portion is fixedly connected to the first connecting portion; The first driving wheel is meshed with the first driven wheel, the second driving wheel is meshed with the second driven wheel, and the third driving wheel is meshed with the third driven wheel.

6. The speed change system according to claim 5, characterized in that: The first connection part is a structure having a stepped outer gear ring and an internal thread connected to the axial direction of the first driving wheel, and the second connection part is a cylindrical structure having an external thread connected to the axial direction of the sun gear. The first connection part and the second connection part are threadedly connected.

7. The speed change system according to claim 6, characterized in that: The transmission system also includes multiple support bearings, one of which is provided between the first driving wheel and the power shaft; one of which is provided between the first driven wheel and the output shaft; and one of which 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 a side wall of the second driven wheel, a second limiting ring is provided on the other side wall of the second driven wheel and a 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 connected, and 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 connected.

8. The speed change system according to claim 5, characterized in that: The first driving wheel has a groove facing one side of the slide rod, and the pair of slide grooves on the power shaft are at least partially located in the groove.

9. The speed change system according to claim 4, characterized in that: The housing comprises a left cover, a right cover and a middle housing with openings at both ends; One end of the power shaft passes through the left cover and is connected to the left cover through a bearing, and the other end passes through the right cover and is connected to the right cover through a bearing, wherein the first oil cylinder is arranged on the right cover; Wherein, the second oil cylinder is arranged on the left cover; one end of the output shaft is connected to the left cover through a bearing, and the interface of the second oil cylinder connecting the slide cylinder is located inside the output shaft, and the other end passes through the right cover and is connected to the right cover through a bearing; The left cover is sealedly connected to an opening at one end of the middle shell, and the right cover is sealedly connected to an opening at the other end of the middle shell.

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

11. The speed change system according to claim 1, characterized in that: The output shaft comprises a first reversing gear set, which comprises a plurality of reversing planetary gears, a transmission frame and a first output cylinder; The transmission frame is provided with an axially dislocated inner gear ring and a connecting ring, and the transmission frame is fixed to the output shaft through the connecting ring; a plurality of reversing planetary gears are mounted on the housing, and the reversing planetary gears are meshed with the inner 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 outer gear portion 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 speed change system according to claim 1, characterized in that: The output shaft includes a second reversing gear set, and the second reversing gear set 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 sleeved on the power shaft, and one end of the second output cylinder is provided with an output gear meshing with the transmission gear, and the other end of the second output cylinder passes through the shell and is provided with a third power output end.

13. A speed change system, characterized in that: include: A housing, an input shaft, an at least partially hollow power shaft, a first stopper, an at least partially hollow output shaft, a second stopper, a planetary gear set, a multi-stage driving wheel set, and a multi-stage driven wheel set; The input shaft, the power shaft and the output shaft can all be 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 fixedly connected with the multi-stage driving gear set to form an amplifying gear set, the inner gear ring is fixed on the housing, the planet carrier, the sun gear and the multi-stage driving gear set of the planetary gear set can be rotatably arranged on the power shaft, and a first clutch transmission assembly is arranged between the power shaft and the planet carrier, and a second clutch transmission assembly is arranged between the power shaft and the amplifying gear set; An input gear is provided on the input shaft, and the input gear is meshed with any one stage of the multi-stage driving wheel set; 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 has a movable first limiter shaft extending into the interior of the power shaft, and the second limiter has a movable second limiter shaft extending into the interior of the output shaft; both the first limiter shaft and the second limiter shaft have a shifting convex portion; The first limiter can drive the first limiter shaft to make its shift protrusion abut against the first clutch transmission component to achieve a transmission connection between the power shaft and the planetary carrier, or drive the first limiter shaft to make its shift protrusion abut against the second clutch transmission component to achieve a transmission connection between the power shaft and the amplifying wheel group; the second limiter can drive the second limiter shaft to make its shift protrusion abut against any of the third clutch transmission components to achieve a transmission connection between the corresponding driven wheel and the output shaft.

14. A bicycle, characterized in that: The bicycle comprises the speed change system according to any one of claims 1 to 13.

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