Electric power-assisted speed control system and bicycle

Abstract

The invention relates to the technical field of electric power-assisted speed control systems of bicycles, and discloses an electric power-assisted speed control system and a bicycle. A shell of the electric power-assisted speed control system is provided with a rotatable first power shaft and a transmission shaft; a rotor of the motor set is connected with the driving gear, the first planetary gear set and the second planetary gear set share the same inner gear ring, and a first sun gear is arranged on the first planet carrier. The first planet gear is meshed with the inner gear ring and the driving gear; a first clutch transmission assembly is arranged between the first power shaft and the first sun gear; a plurality of second planet gears are fixedly connected with the multi-stage driving gear set and are meshed with the inner gear ring and the first sun gear; a second clutch transmission assembly is arranged between the transmission shaft and each stage of the multi-stage driven wheel set. A gear shifting convex part of the first gear shifting mechanism is propped against the first clutch transmission assembly, so that the first power shaft is in transmission connection with the first sun gear; and the gear shifting convex part of the second gear shifting mechanism is propped against any second clutch transmission component, so that the corresponding driven wheel is in transmission connection with the transmission shaft.

Description

Technical Field

[0001] The invention relates to the technical field of electric power-assisted speed-changing systems for bicycles, and in particular to an electric power-assisted speed-changing system. Background Art

[0002] At present, the electric power-assisted bicycles on the market mainly have ordinary reduction mid-mounted motors, which cannot change gears to change speed. The bicycle still has to rely on its own external speed change mechanism to change speed.

[0003] The Chinese invention patent with patent number CN202110458425.7 has realized the superposition of the power-assisted drive mechanism, the speed-changing mechanism and the gear-changing drive mechanism to match the automatic control of the motor and realize centralized control. However, due to the simple superposition of functions, the volume is too large, the speed-changing mechanism is complicated, and the practicality is not great.

[0004] With the popularity of electric-assisted bicycles, the field is in urgent need of a highly integrated, compact, efficient, and centrally controlled mid-mounted electric-assisted hybrid transmission. Summary of the invention

[0005] In view of this, the present invention provides an electric power-assisted transmission system for solving the technical problems in the above-mentioned background technology.

[0006] To achieve one or part or all of the above purposes or other purposes, the present invention provides: an electric power-assisted transmission system, comprising: a housing, a first power shaft that is at least partially hollow, a first shift mechanism, a transmission shaft that is at least partially hollow, a second shift mechanism, an electric power-assisted module, a second planetary gear set, a multi-stage driving wheel set, and a multi-stage driven wheel set;

[0007] The first power shaft and the transmission shaft can both be rotatably connected to the housing, and the first power shaft has a first power input end with both ends extending out of the housing, and the transmission shaft has a power output end with one end extending out of the housing;

[0008] The electric power assist module includes a motor group and a first planetary gear group; the first planetary gear group includes a driving gear, a first planet carrier and a plurality of first planetary gears rotatably arranged on the first planet carrier;

[0009] The stator of the motor group is fixed on the housing, the rotor of the motor group is hollowly arranged along the axial direction, the rotor is axially connected to the driving gear, the rotor is coaxially distributed with the first power shaft, and there is a distance between the rotor and the first power shaft;

[0010] The first planetary gear set and the second planetary gear set share the same internal gear ring, and the internal gear ring is fixed on the housing;

[0011] The first planet carrier is rotatably arranged on the first power shaft, and the first sun gear is axially arranged on the first planet carrier; a plurality of first planet gears are rotatably mounted on the first planet carrier, and the first planet gears mesh with the inner gear ring and the driving gear;

[0012] A first clutch transmission assembly is provided between the first power shaft and the first sun gear;

[0013] The second planetary gear set has a plurality of second planetary gears, which are fixedly connected to the multi-stage driving gear set, and the second planetary gears mesh with the inner gear ring and the first sun gear; the multi-stage driving gear set is rotatably arranged on the first power shaft;

[0014] The multi-stage driven wheel set is rotatably arranged on the transmission shaft, and a second clutch transmission assembly is arranged between the transmission shaft and each stage of the multi-stage driven wheel set;

[0015] The first shift mechanism has a movable first limit shaft extending into the first power shaft, and the second shift mechanism has a movable second limit shaft extending into the transmission shaft; both the first limit shaft and the second limit shaft have a shift convex portion;

[0016] The first shifting mechanism can drive the first limiting shaft to make its shifting protrusion abut against the first clutch transmission component to achieve a transmission connection between the first power shaft and the first sun gear; the second shifting mechanism can drive the second limiting shaft to make its shifting protrusion abut against any of the second clutch transmission components to achieve a transmission connection between the corresponding driven wheel and the transmission shaft.

[0017] Preferably, the multi-stage driving wheel group includes a first driving wheel, a second driving wheel, a third driving wheel and a plurality of limit rods; 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 provided with a connecting portion in the axial direction;

[0019] The second driving wheel is mounted on the connecting portion and is coaxially fixed to the first driving wheel;

[0020] The plurality of limit rods are arranged corresponding to the plurality of second planetary gears, and one end of the limit rod passes through the second planetary gear and the third driving gear in sequence and is fixedly connected to the first driving gear; a third clutch transmission assembly is arranged between the first power shaft and the third driving gear;

[0021] The first shift mechanism can drive the first limit shaft to make its shift convex portion abut against the third clutch transmission assembly so that the first power shaft is connected to the third driving wheel through transmission;

[0022] 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.

[0023] Preferably, the multi-stage driving wheel set includes a third planetary gear set, and the third planetary gear set includes a second planet carrier, a second sun gear and a plurality of third planetary gears; the inner wall of the first driving wheel is provided with an inner tooth portion;

[0024] The second sun gear is fixed on the housing;

[0025] The second planet carrier is rotatably disposed on the first power shaft, a plurality of third planetary gears are mounted on the second planet carrier, and the third planetary gears mesh with the second sun gear and the inner gear portion;

[0026] A fourth clutch transmission assembly is provided between the first power shaft and the second planet carrier;

[0027] The first shift mechanism can drive the first limiting shaft to make its shift protrusion abut against the fourth clutch transmission assembly to achieve transmission connection between the first power shaft and the second planet carrier.

[0028] Preferably, the first power shaft and the transmission shaft are both provided with mounting holes; the first clutch transmission assembly, the third clutch transmission assembly and the fourth clutch transmission assembly are all composed of a first pawl and a second ratchet structure, the first pawl is connected with a spring sheet, and the first pawl is assembled into the mounting hole through the spring sheet, the first ratchet structure is arranged on the first sun gear, the third driving gear and the second planetary carrier, the first pawl is compressed by the spring sheet and is in a contracted state when not abutted by the shifting protrusion, and is not connected to the corresponding first ratchet structure; the first pawl is in an extended state when abutted by the shifting protrusion, and can be transmission-connected to the corresponding first ratchet structure, and an avoidance space is formed between the first pawl and the mounting hole;

[0029] The second clutch transmission assembly is composed of a second pawl and a second ratchet structure, the second pawl is connected to a spring sheet, and the second pawl is assembled into the mounting hole through the spring sheet, the second ratchet structure is arranged on each level of the multi-stage slave wheel group, the second pawl is compressed by the spring sheet and is in a contracted state when not abutted by the shift protrusion, and is not connected to the corresponding second ratchet structure; the second pawl is in an extended state when abutted by the shift protrusion, and can be transmission-connected to the corresponding second ratchet structure, and there is no avoidance space between the outer wall of the second pawl and the inner wall of the mounting hole.

[0030] Preferably, the first shift mechanism and the second shift mechanism both include a control module and a control motor;

[0031] Axially extending threaded holes are provided inside the first power shaft and the transmission shaft;

[0032] The outer walls of the first limiting shaft and the second limiting shaft are both provided with external threads threadedly connected to the threaded hole;

[0033] The first limiting shaft and the second limiting shaft are both provided with axially penetrating connection holes, the connection holes are connected to the rotating shaft of the control motor, and the screw can move along the axial direction of the rotating shaft of the control motor;

[0034] The control module is electrically connected to the control motor.

[0035] Preferably, the first pawl and the second pawl are both provided with grooves connected to the spring sheet, and the first pawl and the second pawl are provided with transition inclined walls, which can abut against the transition inclined walls when the shift protrusion moves axially.

[0036] Preferably, the connecting portion is an axial protrusion connected to the first driving wheel, and the outer wall of the axial protrusion and the inner wall of the second driving wheel are provided with splines that fit into each other.

[0037] Preferably, the housing comprises a left cover, a right cover and a middle housing with openings at both ends;

[0038] One end of the first 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; one end of the transmission shaft 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 stator of the motor group is fixed to the left cover;

[0039] 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.

[0040] Preferably, it further comprises a first reversing gear set, wherein the first reversing gear set comprises a plurality of reversing planetary gears, a transmission frame and an output cylinder;

[0041] The transmission frame is provided with an axially displaced internal gear ring and a connecting ring, and the transmission frame is fixed to the transmission shaft through the connecting ring;

[0042] A plurality of reversing planetary gears are mounted on the housing, and the reversing planetary gears are meshed with the inner gear ring;

[0043] The output cylinder is rotatably mounted on the transmission shaft, and one end of the output cylinder is provided with an external tooth portion for meshing with the reversing planetary gear, and the other end of the output cylinder passes through the housing and is provided with a second power output end.

[0044] An electric power-assisted transmission system comprises: a housing, a first power shaft which is at least partially hollow, a first shift mechanism, a transmission shaft which is at least partially hollow, a second shift mechanism, an electric power-assisted module, a second planetary gear set, a multi-stage driving wheel set, a multi-stage driven wheel set, and a second reversing gear set;

[0045] The first power shaft and the transmission shaft can both be rotatably connected to the housing, and the first power shaft has a first power input end with both ends extending out of the housing;

[0046] The second reversing gear set includes a transmission gear and an output gear, wherein the transmission gear is coaxially fixed on the transmission shaft, and the output gear is rotatably mounted on the first power shaft and meshes with the transmission gear; the output gear is provided with an axially extending third power output end, and the third power output end is arranged outside the housing;

[0047] The electric power assist module includes a motor group and a first planetary gear group; the first planetary gear group includes a driving gear, a first planet carrier and a plurality of first planetary gears rotatably arranged on the first planet carrier;

[0048] The stator of the motor group is fixed on the housing, the rotor of the motor group is hollowly arranged along the axial direction, the rotor is axially connected to the driving gear, the rotor is coaxially distributed with the first power shaft, and there is a distance between the rotor and the first power shaft;

[0049] The first planetary gear set and the second planetary gear set share the same internal gear ring, and the internal gear ring is fixed on the housing;

[0050] The first planet carrier is rotatably arranged on the first power shaft, and the first sun gear is axially arranged on the first planet carrier; a plurality of first planet gears are rotatably mounted on the first planet carrier, and the first planet gears mesh with the inner gear ring and the driving gear;

[0051] A first clutch transmission assembly is provided between the first power shaft and the first sun gear;

[0052] The second planetary gear set has a plurality of second planetary gears, which are fixedly connected to the multi-stage driving gear set, and the second planetary gears mesh with the inner gear ring and the first sun gear; the multi-stage driving gear set is rotatably arranged on the first power shaft;

[0053] The multi-stage driven wheel set is rotatably arranged on the transmission shaft, and a second clutch transmission assembly is arranged between the transmission shaft and each stage of the multi-stage driven wheel set;

[0054] The first shift mechanism has a movable first limit shaft extending into the first power shaft, and the second shift mechanism has a movable second limit shaft extending into the transmission shaft; both the first limit shaft and the second limit shaft have a shift convex portion;

[0055] The first shifting mechanism can drive the first limiting shaft to make its shifting protrusion abut against the first clutch transmission component to achieve a transmission connection between the first power shaft and the first sun gear; the second shifting mechanism can drive the second limiting shaft to make its shifting protrusion abut against any of the second clutch transmission components to achieve a transmission connection between the corresponding driven wheel and the transmission shaft.

[0056] An electric power-assisted transmission system comprises: a housing, a support shaft which is at least partially hollow, a first shift mechanism, a transmission shaft which is at least partially hollow, a second shift mechanism, an electric power-assisted module, a second planetary gear set, a multi-stage driving wheel set, a multi-stage driven wheel set and a second power shaft;

[0057] The second power shaft, the support shaft and the transmission shaft are all rotatably connected to the housing, the transmission shaft has a power output end with one end extending out of the housing; the second power shaft has a second power input end with both ends extending out of the housing, and the second power shaft is provided with an input gear;

[0058] The electric power assist module includes a motor group and a first planetary gear group; the first planetary gear group includes a driving gear, a first planet carrier and a plurality of first planetary gears rotatably arranged on the first planet carrier;

[0059] The stator of the motor group is fixed on the housing, the rotor of the motor group is hollowly arranged along the axial direction, the rotor is axially connected to the driving gear, the rotor is coaxially distributed with the support shaft, and there is a distance between the rotor and the support shaft;

[0060] The first planetary gear set and the second planetary gear set share the same internal gear ring, and the internal gear ring is fixed on the housing;

[0061] The first planet carrier is rotatably arranged on the support shaft, and the first sun gear is axially arranged on the first planet carrier; a plurality of first planet gears are rotatably mounted on the first planet carrier, and the first planet gears mesh with the inner gear ring and the driving gear;

[0062] A first clutch transmission assembly is provided between the support shaft and the first sun gear;

[0063] The second planetary gear set has a plurality of second planetary gears, which are fixedly connected to the multi-stage driving gear set, and the second planetary gears mesh with the inner gear ring and the first sun gear; the multi-stage driving gear set is rotatably arranged on the support shaft, and any one stage of the multi-stage driving gear set can mesh with the input gear;

[0064] The multi-stage driven wheel set is rotatably arranged on the transmission shaft, and a second clutch transmission assembly is arranged between the transmission shaft and each stage of the multi-stage driven wheel set;

[0065] The first shift mechanism has a movable first limit shaft extending into the interior of the support shaft, and the second shift mechanism has a movable second limit shaft extending into the interior of the transmission shaft; both the first limit shaft and the second limit shaft have a shift convex portion;

[0066] The first shifting mechanism can drive the first limiting shaft to make its shifting protrusion abut against the first clutch transmission component to achieve a transmission connection between the support shaft and the first sun gear; the second shifting mechanism can drive the second limiting shaft to make its shifting protrusion abut against any of the second clutch transmission components to achieve a transmission connection between the corresponding driven wheel and the transmission shaft.

[0067] A bicycle comprises the above-mentioned electric power-assisted speed-changing system.

[0068] Implementing the embodiments of the present invention will have the following beneficial effects:

[0069] After adopting the above scheme, a motor group coaxially distributed with the first power shaft is arranged in the shell, the rotor of the motor provides power to the first planetary gear, and the power is transmitted by the first planetary carrier and the first sun gear, and the second planetary gear drives the multi-stage driving wheel group to rotate and provides power for the multi-stage driven wheel group for output; the first sun gear can be connected to the first power shaft through the first shifting mechanism, at this time, the two first power input ends of the first power shaft provide power, and the power is amplified by the multiple second planetary gears to directly drive the multi-stage driving wheel group to rotate, and provide power for the multi-stage driven wheel group for output; it can be seen that the motor group provides power for the multi-stage driving wheel group The built-in electric-driven power source, the first shifting mechanism and the first clutch transmission assembly can connect the first sun gear to the first power shaft, so that the first power input end of the first power shaft provides another power source for the multi-stage driving wheel set, and the two power sources are independent of each other and do not interfere with each other, so that the user can choose the corresponding power source according to actual conditions when using a bicycle with the electric power-assisted transmission system, thereby effectively improving the user's riding experience; in addition, since the transmission shaft is connected to the multi-stage driven wheel set, each stage can obtain multiple different output speeds, and the entire system can provide multiple different speed changes according to the number of gears of the multi-stage driven wheel set. BRIEF DESCRIPTION OF THE DRAWINGS

[0070] 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.

[0071] in:

[0072] Figure 1It is a schematic diagram of the overall structure of the first embodiment;

[0073] Figure 2 It is an exploded view of the overall structure of the first embodiment;

[0074] Figure 3 It is a cross-sectional view of the overall structure of the first embodiment;

[0075] Figure 4 This is a schematic diagram of the structure without a housing of the first embodiment;

[0076] Figure 5 It is an exploded view of the structure without a shell of the first embodiment;

[0077] Figure 6 This is a schematic diagram of the separation of the first power shaft structure of the first embodiment;

[0078] Figure 7 It is a schematic diagram of the structure of the transmission shaft part of the first embodiment;

[0079] Figure 8 for Figure 3 AA section view in;

[0080] Fig. 9 for Figure 3 BB section view in;

[0081] Fig.10 for Figure 3 CC section view in;

[0082] Fig.11 for Figure 3 DD section view in;

[0083] Fig.12 It is a structural schematic diagram of the first power shaft and the first shift mechanism of the first embodiment;

[0084] Fig.13 This is a schematic structural diagram of the first driving wheel of Embodiment 1;

[0085] Fig.14 Schematic diagram of the first pawl and the first power shaft, and the second pawl and the transmission shaft in the first embodiment;

[0086] Fig.15 A cross-sectional view of the first pawl and the second pawl when assembled in the first embodiment;

[0087] Fig.16 It is a schematic structural diagram of the second pawl and the spring piece of the first embodiment;

[0088] Fig.17 The structure of the first reversing gear set in the second embodiment is shown in FIG. Figure 1 ;

[0089] Fig.18 The structure of the first reversing gear set in the second embodiment is shown in FIG. Figure 2 ;

[0090] Fig.19 It is a schematic diagram of the structure of the embodiment 3 equipped with a second reversing gear set;

[0091] Fig. 20 It is a schematic diagram of the internal structure of the embodiment 3 equipped with a second reversing gear set;

[0092] Fig.21 This is a structural separation diagram of the third embodiment equipped with a second reversing gear set;

[0093] Fig. 22 It is a schematic diagram of the internal structure in the fourth embodiment.

[0094] Reference numerals:

[0095] 1. Shell; 101. Right cover; 102. Left cover; 103. Middle shell;

[0096] 20. First power shaft; 200. Mounting hole; 201. First power input end; 202. Threaded hole; 21. Transmission shaft; 211. First power output end; 212. Transmission spline; 22. First reversing gear set; 220. Reversing planetary gear; 221. Transmission frame; 221a. Internal gear ring; 221b. Connecting ring; 222. Output cylinder; 222a. External gear; 222b. Second power output end; 23. Second reversing gear set; 230. Output gear; 230a. Third power output end; 231. Transmission gear; 24. Second power shaft; 240. Input gear; 241. Second power input end; 25. Support shaft;

[0097] 30, first shift mechanism; 301, first limit shaft; 301a, shift convex portion; 301b, connection hole; 302, control module; 302a, control board; 302b, battery; 302c, protective shell; 303, control motor; 31, second shift mechanism; 311, second limit shaft;

[0098] 4. Motor group; 40. Stator; 41. Rotor; 42. Driving gear;

[0099] 5. First planetary gear set; 50. Internal gear ring; 51. First planet carrier; 52. First planetary gear; 53. First sun gear;

[0100] 6. Second planetary gear set; 60. Second planetary gear;

[0101] 7. Multi-stage driving wheel set; 70. Third planetary gear set; 702. Second planet carrier; 703. Third planetary gear; 704. Second sun gear; 71. First driving wheel; 710. Connecting part; 711. Internal gear part; 72. Second driving wheel; 73. Third driving wheel; 74. Limit rod;

[0102] 8. Multi-stage driven wheel set; 81. first driven wheel; 82. second driven wheel; 83. third driven wheel;

[0103] 90. First pawl; 91. First ratchet structure; 92. Second pawl; 920. Groove; 921. Transition inclined wall; 93. Second ratchet structure; 94. Shrapnel. DETAILED DESCRIPTION

[0104] 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.

[0105] Reference to an "embodiment" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiment 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.

[0106] 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.

[0107] Embodiment 1:

[0108] As attached Figure 1-16 As shown, an embodiment of the present invention provides an electric power-assisted transmission system, which includes: a housing 1, a first power shaft 20 that is at least partially hollow, a first shift mechanism 30, a transmission shaft 21 that is at least partially hollow, a second shift mechanism 31, an electric power module, a second planetary gear set 6, a multi-stage driving wheel set 7, and a multi-stage driven wheel set 8;

[0109] The first power shaft 20 and the transmission shaft 21 can both be rotatably connected to the housing 1, and the first power shaft 20 has a first power input end 201 with both ends extending out of the housing 1, and the transmission shaft 21 has a first power output end 211 with one end extending out of the housing 1;

[0110] The electric power assist module includes a motor group 4 and a first planetary gear group 5. The first planetary gear group 5 includes a driving gear 42, a first planet carrier 51, and a plurality of first planetary gears 52 rotatably arranged on the first planet carrier 51.

[0111] The stator 40 of the motor group 4 is fixed on the housing 1, and the rotor 41 of the motor group 4 is hollowly arranged along the axial direction. The rotor 41 is axially connected to the driving gear 42, and the rotor 41 is coaxially distributed with the first power shaft 20, and there is a distance between the rotor 41 and the first power shaft 20;

[0112] The first planetary gear set 5 and the second planetary gear set 6 share the same internal gear ring 50, and the internal gear ring 50 is fixed on the housing 1;

[0113] The first planet carrier 51 is rotatably disposed on the first power shaft 20 , and a first sun gear 53 is axially disposed on the first planet carrier 51 ; a plurality of first planetary gears 52 are rotatably mounted on the first planet carrier 51 , and the first planetary gears 52 mesh with the inner gear ring 50 and the driving gear 42 ;

[0114] A first clutch transmission assembly is provided between the first power shaft 20 and the first sun gear 53;

[0115] The second planetary gear set 6 has a plurality of second planetary gears 60, which are fixedly connected to the multi-stage driving gear set 7, and the second planetary gears 60 mesh with the inner gear ring 50 and the first sun gear 53; the multi-stage driving gear set 7 is rotatably disposed on the first power shaft 20;

[0116] The multi-stage driven wheel set 8 is rotatably arranged on the transmission shaft 21, and a second clutch transmission assembly is arranged between the transmission shaft 21 and each stage of the multi-stage driven wheel set 8;

[0117] The first shift mechanism 30 has a movable first limit shaft 301 extending into the first power shaft 20, and the second shift mechanism 31 has a movable second limit shaft 311 extending into the transmission shaft 21; both the first limit shaft 301 and the second limit shaft 311 have a shift convex portion 301a;

[0118] The first shifting mechanism 30 can drive the first limiting shaft 301 to make its shifting protrusion 301a abut against the first clutch transmission component to achieve a transmission connection between the first power shaft 20 and the first sun gear 53; the second shifting mechanism 31 can drive the second limiting shaft 311 to make its shifting protrusion 301a abut against any second clutch transmission component to achieve a transmission connection between its corresponding driven wheel and the transmission shaft 21.

[0119] In this embodiment, the first power shaft 20 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 transmission shaft 21 has a first power output end 211 extending out of the housing 1. The first power output end 211 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 4 and Figure 5As shown, of course, it can also be a combination of four, five or six gears, or even more, or a combination of two gears. These gears only need to ensure that after installation, the driving gears of each stage and the driven gears of each stage are meshed accordingly; the rotor 41 of the motor group 4 of this embodiment is hollow along the axial direction to facilitate the passage of the first power shaft 20, and the internal space of the shell 1 is reasonably used so that the rotor 41 and the first power shaft 20 can rotate independently without interfering with each other. Specifically, bearings can be assembled between the inner wall of the rotor 41 and the first power shaft 20 to improve the connection stability; the driving gear 42 on the rotor 41 of the battery 302b gear set is meshed with the first planetary gear 52, that is, the driving gear 42 acts as the sun gear of the first planetary gear set 5, and the power is input through the driving gear 42, and then amplified and output to the second planetary gear set 6 through multiple first planetary gears 52, The second planetary gear set 6 is fixedly connected to the multi-stage driving wheel set 7 to form a whole, and the power is finally output to the multi-stage driven wheel set 8 through the multi-stage driving wheel set 7; when the motor set 4 is selected as the power source, the first shift mechanism 30 makes the shift convex portion 301a not connected to the first clutch transmission assembly, that is, the first sun gear 53 idles on the first power shaft 20, so as to avoid the situation that when the motor set 4 drives the multi-stage driving wheel set 7 to rotate, the first power shaft 20 rotates, causing the pedal connected to the first power input end 201 to rotate accordingly; specifically, a control circuit board and a corresponding power supply for controlling the motor 303 gear set can also be arranged in the housing 1, and the control circuit board is provided with a wireless receiving module such as Bluetooth and WiFi, so as to facilitate the user to control and select the corresponding power source and the speed of the rotor 41 when the motor set 4 is selected as the power source. Correspondingly, when the first power input end 201 at both ends of the first power shaft 20 is selected as the power source, the first shift mechanism 30 controls the shift protrusion 301a of the first limit shaft 301 to abut against the first clutch transmission assembly, so that the first power shaft 20 is connected to the first sun gear 53 in transmission. At this time, the power is input through the first power input end 201 of the first power shaft 20, amplified by the first sun gear 53 and multiple second planetary gears 60, and output to the multi-stage driving wheel group 7, and finally output through the multi-stage driven wheel group 8 and the first power output end 211 of the transmission shaft 21.

[0120] The multi-stage driven wheel set 8 is rotatably arranged on the transmission shaft 21. Relatively, each gear on the multi-stage driven wheel set 8 is independent of each other when rotating. The first clutch transmission assembly and the second clutch transmission assembly are both components that can separate or engage the transmission, and can be a ratchet 90 structure as described later, or can be other forms, for example, two friction plates, and the abutment or separation of the two friction plates is controlled by the shift convex portion 301a to control the separation or engagement of the transmission.

[0121] See attached Figure 8 and attached Fig. 9When working, if the first shifting mechanism 30 drives the first limiting shaft 301 to make its shifting protrusion 301a abut against the first clutch transmission component so that the first power shaft 20 is connected to the first sun gear 53, at this time, the rotor 41 of the motor group 4 is in an idling state, and the power is transmitted through the first power input end 201 of the first power shaft 20, and after being amplified by the multiple second planetary gears 60 of the second planetary gear set 6, it directly drives the multi-stage driving wheel set 7 to rotate, and the second shifting mechanism 31 drives the second limiting shaft 311 to make its shifting protrusion 301a abut against the second clutch transmission component required to be output so that the corresponding driven wheel is connected to the transmission shaft 21. For example, the shifting protrusion 301a of the second limiting shaft 311 abuts against the first gear on the left of the multi-stage driven wheel set 8. 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 transmission shaft 21, and finally drives the toothed disc connected to the first power output end 211 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 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 transmission shaft 21, the other gears on the multi-stage driven wheel set 8 are idling and do not affect the transmission process. If the first shift mechanism 30 drives the first limit shaft 301 so that its shift convex part 301a does not abut against the first clutch transmission component, the first sun gear 53 is not in transmission connection with the first power shaft 20 and is in an idling state; at this time, the motor set 4 is started and powered by the rotor 41, and the power is transmitted through the driving gear 42, driving the multiple first planetary gears 52 to rotate, and the power is transmitted to the multiple second planetary gears 60 through the first planet carrier 51 and the second sun gear 704, and the multiple second planetary gears 60 drive the multi-stage driving wheel set 7 to rotate, and the second shift mechanism 30 drives the first limit shaft 301 to abut against the first clutch transmission component, so that ... The shift mechanism 31 drives the second limit shaft 311 to make its shift convex part 301a abut against the second clutch transmission assembly to be outputted, so that the corresponding driven wheel is connected to the transmission shaft 21. For example, the shift convex part 301a of the second limit shaft 311 abuts against the first gear on the left of the multi-stage driven wheel set 8. 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 transmission shaft 21, and finally drives the toothed disc connected to the first power output end 211 of the transmission shaft 21 to output. Although the multi-stage driving wheel set 7 and the multi-stage driven wheel set 8 are all meshed in the above transmission process, since only the first gear on the left of the multi-stage driven wheel set 8 has a transmission relationship with the transmission shaft 21, the other gears on the multi-stage driven wheel set 8 are idle, which does not affect the transmission process.

[0122] In summary, a motor group 4 coaxially distributed with the first power shaft 20 is arranged in the housing 1, and power is provided to the first planetary gear 52 through the rotor 41 of the motor, and power is transmitted by the first planetary carrier 51 and the first sun gear 53, and the multi-stage driving wheel group 7 is driven by the second planetary gear 60 to rotate and provide power for the multi-stage driven wheel group 8 for output; the first sun gear 53 can be connected to the first power shaft 20 through the first shifting mechanism 30. At this time, the two first power input ends 201 of the first power shaft 20 provide power, and the power is amplified by the multiple second planetary gears 60 to directly drive the multi-stage driving wheel group 7 to rotate, and provide power for the multi-stage driven wheel group for output; it can be seen that the motor group 4 is a multi-stage driving The wheel set 7 provides a built-in electric drive power source, and the first shifting mechanism 30 and the first clutch transmission assembly can drive the first sun gear 53 to the first power shaft 20, so that the first power input end 201 of the first power shaft 20 provides another power source for the multi-stage driving wheel set 7, and the two power sources are independent of each other and do not interfere with each other, so that the user can choose the corresponding power source according to actual conditions when using a bicycle with the electric power-assisted transmission system, thereby effectively improving the user's riding experience; in addition, since the transmission shaft 21 is driven and connected to the multi-stage driven wheel set 8, each stage can obtain multiple different output speeds, and the entire system can provide multiple different speed changes according to the number of gears of the multi-stage driven wheel set 8.

[0123] See attached Figure 4 and attached Figure 5 The multi-stage driving wheel set 7 includes a first driving wheel 71, a second driving wheel 72, a third driving wheel 73 and a plurality of limit rods 74; the multi-stage driven wheel set 8 includes a first driven wheel 81, a second driven wheel 82 and a third driven wheel 83;

[0124] The first driving wheel 71 is provided with a connecting portion in the axial direction;

[0125] The second driving wheel 72 is coaxially fixed to the first driving wheel 71 on the sleeve connection portion;

[0126] A plurality of limit rods 74 are provided corresponding to the plurality of second planetary gears 60, and one end of the limit rod 74 passes through the second planetary gear 60 and the third driving gear 73 in sequence and is fixedly connected to the first driving gear 71; a third clutch transmission assembly is provided between the first power shaft 20 and the third driving gear 73;

[0127] The first shift mechanism 30 can drive the first limit shaft 301 to make its shift convex portion 301a abut against the third clutch transmission assembly so that the first power shaft 20 is connected to the third driving wheel 73 through transmission;

[0128] The first driving wheel 71 meshes with the first driven wheel 81 , the second driving wheel 72 meshes with the second driven wheel 82 , and the third driving wheel 73 meshes with the third driven wheel 83 .

[0129] The second driving wheel 72 is mounted on the connecting portion and rotates with the first driving wheel 71 at the same angular velocity as the first driving wheel 71; and the third driving wheel 73 is connected to the second planetary gear 60 and the first driving wheel 71 at the same time through the limiting rod 74. Specifically, a through hole with a thread can be provided on the inner wall of the connecting portion of the first driving wheel 71, so that the limiting rod 74 is threadedly connected to the first driving wheel 71 after passing through the second planetary gear 60 and the third driving wheel 73, so that the third driving wheel 73 has the same angular velocity as the first driving wheel 71, and ensures that the rotation of the plurality of second planetary gears 60 drives the third driving wheel 73, the second driving wheel 72 and the first driving wheel 71 to rotate together; in order to increase the number of gear shifting positions of the electric power transmission system, the third driving wheel 73 is A third clutch transmission assembly is provided between 73 and the first power shaft 20. When the first shifting mechanism 30 drives the first limiting shaft 301 to make its shifting protrusion 301a abut against the third clutch transmission assembly, the first power shaft 20 is connected to the third driving wheel 73, and power is transmitted through the first power input end 201 of the first power shaft 20, directly driving the third driving wheel 73 to rotate. Since the third driving wheel 73 is fixedly connected to the second driving wheel 72 and the first rotating wheel, the second driving wheel 72 and the first driving wheel 71 rotate together with the third driving wheel 73. The second shifting mechanism 31 drives the second limiting shaft 311 to make its shifting protrusion 301a abut against the second clutch transmission assembly required for output, so that the corresponding driven wheel is connected to the transmission shaft 21 for transmission. For example, the first driven wheel 81 is connected to the transmission shaft 21 through the second clutch transmission assembly, and then transmitted to the transmission shaft 21 through the first driven wheel 81, and finally drives the toothed disc connected to the first power output end 211 of the transmission shaft 21 to output. In summary, since the electric power-assisted transmission system introduces the third clutch transmission assembly between the third driving wheel 73 and the first power shaft 20, combined with the first clutch transmission assembly between the first sun gear 53 and the first power shaft 20, the multi-stage driving wheel group 7 can provide two sets of different input speeds for the multi-stage driven wheel group 8. Since the multi-stage driven wheel group is three-stage in this embodiment, and each stage of gear can be connected to the transmission shaft 21 through the second clutch transmission assembly, the electric power-assisted transmission system can provide a total of 2×3=6 sets of different output speeds, effectively increasing the number of gear positions of the electric power-assisted transmission system and providing users with more diverse speed choices.

[0130] Furthermore, the multi-stage driving gear set 7 of this embodiment further includes a third planetary gear set 70, and the third planetary gear set 70 includes a second planet carrier 702, a second sun gear 704 and a plurality of third planetary gears 703; the inner wall of the first driving gear 71 is provided with an inner tooth portion;

[0131] The second sun gear 704 is fixed on the housing 1;

[0132] The second planet carrier 702 is rotatably disposed on the first power shaft 20, and a plurality of third planetary gears 703 are mounted on the second planet carrier 702, and the third planetary gears 703 mesh with the second sun gear 704 and the inner gear portion;

[0133] A fourth clutch transmission assembly is provided between the first power shaft 20 and the second planet carrier 702;

[0134] The first shift mechanism 30 can drive the first limiting shaft 301 to make its shift protrusion 301 a abut against the fourth clutch transmission assembly so that the first power shaft 20 and the second planetary carrier 702 are in transmission connection.

[0135] Specifically, a stepped hole-shaped cavity structure is formed inside the first driving wheel 71, and the second planetary carrier 702 has a cylindrical structure connected to the first power shaft 20 and the fourth clutch transmission assembly and a connecting arm for mounting a plurality of third planetary gears 703, wherein the connecting arm is inclined along the axial direction; accordingly, the connecting portion and the inner tooth portion of the first driving wheel 71 are staggered with each other along the axial direction, so that after the second planetary gear set 6 is assembled between the first driving wheel 71 and the first power shaft 20, the cylindrical structure of the second planetary carrier 702 and the connecting portion and the second driving wheel 72 are in the same vertical plane, and the plurality of third planetary gears 703 and the second sun gear 704 and the inner tooth portion are in the same vertical plane, thereby making full use of the internal space of the first driving wheel 71 and improving the structural compactness and stability of the electric power transmission system; in this embodiment, since the second sun gear 704 is fixed and the first driving wheel 71 is rotatable, when When power is input by the second planet carrier 702 and the plurality of third planetary gears 703, it must be output through the first driving wheel 71, that is, the first driving wheel 71 is driven to rotate; it should also be noted that the system can be provided with different speed change options by setting the size relationship between the radius R1 of the orbital circle of the plurality of first planetary gears 52, the radius R2 of the orbital circle of the plurality of second planetary gears 60, and the radius R3 of the orbital circle of the plurality of third planetary gears 703. The specific setting can be made according to the actual speed change requirements. For example, when the radius R1 of the orbital circle of the plurality of first planetary gears 52 is equal to the radius R2 of the orbital circle of the plurality of second planetary gears 60, and the radius R1 of the orbital circle of the plurality of first planetary gears 52 is greater than the radius R3 of the orbital circle of the plurality of third planetary gears 703, the plurality of third planetary gears 703 can provide the multi-stage driving wheel set 7 with an input speed different from that of the plurality of second planetary gears.

[0136] During operation, when the first shifting mechanism 30 drives the first limiting shaft 301 to make its shifting protrusion 301a abut against the fourth clutch transmission assembly, the first power shaft 20 is connected to the second planetary carrier 702, and the power is transmitted through the first power input end 201 of the first power shaft 20, and is amplified by the second planetary carrier 702 and the plurality of third planetary gears 703 to drive the first driving wheel 71 to rotate. Since the third driving wheel 73 is fixedly connected with the second driving wheel 72 and the first rotating wheel, the second driving wheel 72 and the third driving wheel 73 rotate together with the first driving wheel 71, and the second shifting mechanism 31 drives the second limiting shaft 311 to make its shifting protrusion 301a abut against the second clutch transmission assembly to be output, so that the corresponding driven wheel is connected to the transmission shaft 21, for example, by connecting the first driven wheel 81 to the transmission shaft 21 through the second clutch transmission assembly, and then transmitting to the transmission shaft 21 through the first driven wheel 81, and finally driving the toothed disc connected to the first power output end 211 of the transmission shaft 21 to output. In summary, since the electric power-assisted transmission system introduces the fourth clutch transmission assembly between the second planetary carrier 702 and the first power shaft 20, combined with the first clutch transmission assembly between the first sun gear 53 and the first power shaft 20, and the third clutch transmission assembly between the third driving wheel 73 and the first power shaft 20, the multi-stage driving wheel group 7 can provide three sets of different input speeds for the multi-stage driven wheel group 8. Since the multi-stage driven wheel group has three stages in this embodiment, and each stage of gears can be connected to the transmission shaft 21 through the second clutch transmission assembly, the electric power-assisted transmission system can provide a total of 3×3=9 sets of different output speeds, which effectively increases the number of gear positions of the electric power-assisted transmission system without changing the volume of the existing multi-stage driving wheel group 7.

[0137] See attached Figure 5 , Figure 6 , Fig.12 , Fig.14 , Fig.15 and Fig.16 , the first power shaft 20 and the transmission shaft 21 are both provided with mounting holes 200; the first clutch transmission assembly, the third clutch transmission assembly and the fourth clutch transmission assembly are all composed of a first pawl 90 and a first ratchet structure 91, the first pawl 90 is connected with a spring sheet 94, the first pawl 90 is assembled into the mounting hole 200 through the spring sheet 94, the first ratchet structure 91 is arranged on the first sun gear 53, the third driving gear 73 and the second planetary carrier 702, the first pawl 90 is compressed by the spring sheet and is in a contracted state when not abutted by the shift protrusion 301a, and is not connected to the corresponding first ratchet structure 91; the first pawl 90 is in an extended state when abutted by the shift protrusion 301a, and can be transmission-connected to the corresponding first ratchet structure 91, and a avoidance space is formed between the first pawl 90 and the mounting hole 200.

[0138] The second clutch transmission assembly is composed of a second pawl 92 and a second ratchet structure 93. The second pawl 92 is connected to a spring sheet 94, and the second pawl 92 is assembled into the mounting hole 200 through the spring sheet 94. The second ratchet structure 93 is arranged on each level of the multi-level slave wheel group 8. When the second pawl 92 is not abutted by the shift protrusion 301a, it is compressed by the spring sheet 94 and is in a contracted state, and is not connected to the corresponding second ratchet structure 93; when the second pawl 92 is abutted by the shift protrusion 301a, it is in an extended state, and can be transmission-connected to the corresponding second ratchet structure 93, and there is no avoidance space between the outer wall of the second pawl 92 and the inner wall of the mounting hole 200.

[0139] Specifically, the first clutch transmission assembly, the third clutch transmission assembly and the fourth clutch transmission assembly are distributed along the axial direction of the first power shaft 20 with the same spacing, which can not only achieve the compactness of the structural distribution, but also enable the first shift mechanism 30 to use simpler instructions to control the movement of the first limit shaft 301, that is, it is only necessary to control the first limit shaft 301 to move the same distance each time to achieve switching between different clutch transmission assemblies. Similarly, the second clutch transmission assembly is provided with three corresponding to the three-stage driven wheels of the multi-stage driven wheel group 8, and the three second clutch transmission assemblies are distributed along the axial direction of the transmission shaft 21 with the same spacing, which will not be repeated here. In the present embodiment, taking the third clutch transmission assembly on the first power shaft 20 as an example, a plurality of mounting holes 200 are provided at positions on the first power shaft 20 corresponding to the third driving wheel 73, a plurality of first pawls 90 are correspondingly installed on the mounting holes 200, and one end of a spring sheet 94 is connected to the first pawl 90, and the other end of the spring sheet 94 is fixed to the side wall of the mounting hole 200, the axial direction of the mounting hole 200 is perpendicular to the axial direction of the first power shaft 20, and the first pawl 90 can move along the axial direction of the mounting hole 200, and the first pawl 90 is compressed by the spring sheet 94 and is in a contracted state when not abutted by the shifting protrusion 301a; the first pawl 90 is in an extended state when abutted by the shifting protrusion 301a; the inner ring of the third driving wheel 73 is provided with a first ratchet structure 91, and when the first power shaft 20 is moved along the gear shifting protrusion 301a, the first pawl 90 is in an extended state. Fig.15 When the first pawl 90 rotates forward in the direction of the arrow shown in the figure, the first pawl 90 is abutted by the shifting protrusion 301a, so that it establishes a transmission connection with the first ratchet structure 91 on the third driving wheel 73, thereby driving the third driving wheel 73 to rotate together. Fig.15When the first power shaft 20 rotates in the opposite direction of the arrow shown, since there is an avoidance space between the first pawl 90 and the inner wall of the mounting hole 200, when the first power shaft 20 rotates in the reverse direction, the first pawl 90 is squeezed by the first ratchet structure 91 and retreats into the avoidance space, that is, the reverse rotation of the first power shaft 20 cannot drive the third driving wheel 73 to rotate together, thereby avoiding affecting the normal use of other transmission structures on the first power shaft 20 and the transmission shaft 21 when the pedal is stepped on in the reverse direction. The principles of the first clutch assembly and the fourth clutch assembly are the same as those of the third clutch assembly and are not elaborated here. The second clutch assembly is different from the above three clutch assemblies in that the second pawl 92 of the second clutch assembly is thicker than the first pawl 91. When the second pawl When 92 is assembled to the mounting hole 200 on the transmission shaft 21, the gap between the second pawl 92 and the mounting hole 200 is only enough for the second pawl 92 to move along the axial direction of the mounting hole 200, and cannot produce radial swing, so that the multi-stage driven wheel group 8 can drive the transmission shaft 21 to rotate no matter which direction it rotates. On the contrary, when the bicycle is going downhill or gliding, the rotation of the transmission shaft 21 will also drive the multi-stage driven wheel group 8 to rotate, and then drive the rotation of the multi-stage driving wheel group 7, providing energy recovery for the electric power module, and charging the power supply part of the electric power transmission system through the reverse rotation of the motor in the electric power module. In addition, since the second pawl 92 does not need to realize unidirectional rotation, the processing cost of the second pawl 92 is greatly reduced.

[0140] In order to enable the shift protrusion 301a to quickly convert the axially distributed first pawl 90 or the second pawl 92 to the extended state when it moves axially, a transition inclined wall 921 is provided on the first pawl 90 and the second pawl 92, and the shift protrusion 301a can easily convert the first pawl 90 or the second pawl 92 to the extended state by abutting against the transition inclined wall 921; and in order to facilitate the connection stability between the spring piece 94 and the first pawl 90 or the second pawl 92, and to ensure that the first pawl 90 or the second pawl 92 can be quickly reset by the spring piece 94 when it is not abutted by the shift protrusion 301a, a groove 920 is provided on the top of the first pawl 90 and the second pawl 92, one end of the spring piece 94 is embedded in the groove 921, and the other end of the spring piece 94 is fixed to the inner wall of the mounting hole 200.

[0141] Preferably, the first shift mechanism 30 and the second shift mechanism 31 both include a control module 302 and a control motor 303;

[0142] The first power shaft 20 and the transmission shaft 21 are provided with axially extending threaded holes 202 inside;

[0143] The outer walls of the first limiting shaft 301 and the second limiting shaft 311 are both provided with external threads threadedly connected to the threaded hole 202;

[0144] The first limiting shaft 301 and the second limiting shaft 311 are both provided with an axially penetrating connection hole 301b, the connection hole 301b is connected to the rotating shaft of the control motor 303, and the screw can move along the axial direction of the rotating shaft of the control motor 303;

[0145] The control module 302 is electrically connected to the control motor 303 .

[0146] Since the first gear shift mechanism 30 and the second gear shift mechanism 31 adopt the same structure, this embodiment is only described with reference to the first gear shift mechanism 30. In order to prevent relative rotation between the first limit shaft 301 and the rotating shaft of the control motor 303, in this embodiment, the cross-section of the connecting hole 301b and the cross-section of the rotating shaft of the control motor 303 are both hexagonal. When the control motor 303 is started to rotate its rotating shaft, the connecting hole 301b and the rotating shaft of the control motor 303 cannot rotate relative to each other, and the first limit shaft 301 is threadedly connected to the threaded hole 202 of the first power shaft 20, so that the first limit shaft 301 produces a displacement movement along the axial direction of the first power shaft 20. In other embodiments, the cross-sections of the connecting hole 301b and the rotating shaft of the control motor 303 can also be D-shaped, triangular or other special shapes. The control module 302 includes a battery 302b and a control board 302a, wherein the battery 302b and the control board 302a are arranged along the axial direction of the first power shaft 20, and the control board 302a is at the end position of the first power shaft 20, so that the wireless receiving element of the control board 302a is not hindered by the battery 302b and other elements, ensuring smooth communication between the control board 302a and the external electronic device. Specifically, three gear instructions can be set in the control board 302a, and the three gear instructions are transmitted to the control motor 303, so that the shaft of the control motor 303 rotates in a specified direction and number of revolutions. For example, the control board 302a sends a first gear instruction to the control motor 303, so that the first limit shaft 301 moves, so that its shift convex portion 301a is placed in the position of the first clutch transmission component, and drives the first clutch transmission component to connect with the first sun gear 53, so as to establish a transmission connection between the first sun gear 53 and the first power shaft 20. Fig.12 As shown, in order to facilitate the assembly of the battery 302b and the control board 302a into the interior of the first power shaft 20, the control module 302 is also provided with a protective shell 302c, which wraps the battery 302b and the control board 302a, and an elastic latch cam is provided at the end of the protective shell 302c for connection with the first power shaft 20, so as to facilitate the disassembly and assembly of the control module 302 as a whole from the first power shaft 20.

[0147] See attached Figure 2 The housing 1 includes a left cover 102, a right cover 101 and a middle housing 103 with openings at both ends;

[0148] One end of the first power shaft 20 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; one end of the transmission shaft 21 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 stator 40 of the motor group 4 is fixed on the left cover 102;

[0149] 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 .

[0150] In this embodiment, the transmission structure of the entire electric power-assisted transmission system of the above structure is sealed inside the housing 1, and the interfaces between the first power shaft 20 and the left cover 102 and the right cover 101 can be sealed using a sealing cover, and a sealing ring is provided inside the sealing cover for further sealing. 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 electric power-assisted transmission system of the present invention, even if it is ridden on a muddy road, there is no need to worry about the system being damaged by foreign objects entering, which is especially suitable for mountain bikes.

[0151] Embodiment 2:

[0152] See attached Fig.17 and attached Fig.18 The electric power transmission system also includes a first reversing gear set 22, which includes a plurality of reversing planetary gears 220, a transmission frame 221 and an output cylinder 222; the transmission frame 221 is provided with an axially displaced inner gear ring 221a and a connecting ring 221b, and the transmission frame 221 is fixed to the transmission shaft 21 through the connecting ring 221b; a plurality of reversing planetary gears 220 are mounted on the housing 1, and the reversing planetary gears 220 are meshed with the inner gear ring 221a; the output cylinder 222 is rotatably mounted on the transmission shaft 22, and one end of the output cylinder 222 is provided with an outer tooth portion 222a for meshing with the reversing planetary gear 220, and the other end of the output cylinder 222 passes through the housing 1 and is provided with a second power output end 332b.

[0153] Specifically, when the electric power transmission system is applied to a bicycle, the second power output end 332b of the output cylinder 332 can be used to install a crankset; the inner wall of the connecting ring 221b of the transmission frame 221 is provided with a spline structure, and the outer wall of the transmission shaft 21 is provided with a transmission spline 212 connected to the connecting ring 221b. Through the spline connection, the transmission shaft 21 can drive the transmission frame 221 to transmit together when it rotates. In addition, since a plurality of reversing planetary gears 220 are installed on the housing 1, and the output cylinder 222 is rotatably mounted on the transmission shaft 21, The power is input through the transmission frame 221, transmitted by multiple reversing planetary gears 220, and finally output through the output cylinder 222. This method makes the direction of the output cylinder 222 opposite to the direction of the transmission shaft 21. Since the transmission shaft 21 and the first power shaft 20 are transmitted by external gear meshing, after the transmission of the first reversing gear set 22, the direction of the output cylinder 222 is the same as the direction of the first power shaft 20, that is, in this embodiment, the direction of the chainring installed on the output cylinder 222 is the same as the direction of the first power shaft 20.

[0154] Embodiment three:

[0155] See attached Fig.19 -Attached Fig.21The electric power-assisted transmission system includes a second reversing gear set 23, and the second reversing gear set 23 includes a transmission gear 231 and an output gear 230. This embodiment only describes the differences from the above embodiments. In this embodiment, a third power output end 230a is provided on the output gear 230. Specifically, the third power output end 230a is an axial extension structure of the output gear 230, wherein the transmission gear 231 is coaxially fixed on the transmission shaft 21, and the output gear 230 can be rotatably mounted on the first power shaft 20 and meshed with the transmission gear 231; when the output gear 230 is assembled on the first power shaft 20, the third power output end 230a is extended out of the housing 1, and the third power output end 230a is used to connect the crankset of the bicycle, etc., to provide power for the wheels; this embodiment In this embodiment, the output gear 230 can be assembled to the first power shaft 20 by means of a bearing, and a bearing is also provided between the output gear 230 and the housing 1, so that the rotation of the output gear 230 and the first power shaft 20 do not interfere with each other. In order to ensure the stable transmission of power, the transmission gear 231 is assembled on the transmission shaft 21 by means of a spline connection, so that the rotation of the transmission shaft 21 can drive the transmission gear 231 to rotate together; the transmission gear 231 and the output gear 230 are meshed with each other, so that the direction of the power output end 211 is opposite to the direction of the transmission shaft 21, which can be specifically compared with the first power output end 211 on the transmission shaft 21 in the first embodiment. In this embodiment, due to the setting of the second reversing gear set 23, the reversing purpose of the third power output end 230a is achieved. In summary, the power of this embodiment is provided via the first power input end 201 or the motor group 4 fixed at both ends of the first power shaft 20, driving the first power shaft 20 to rotate, and is transmitted to the transmission shaft 21 through the multi-stage driving wheel group 7 and the multi-stage driven wheel group 8. The torque and speed after multi-stage speed change are transmitted to the transmission gear 231 through the transmission shaft 21, and the transmission gear 231 is meshed with the output gear 230 to achieve reversing, and finally transmitted through the third power output end 230a fixed on the output gear 230.

[0156] Embodiment 4:

[0157] This embodiment only describes the differences from the first embodiment. Fig. 22The electric power-assisted transmission system includes a second power shaft 24 and a support shaft 25 that is at least partially hollow. The support shaft 25 can be rotatably installed in the housing 1 and is used to assemble the multi-stage driving wheel set 7 and the first shift mechanism 30. The function of the support shaft 25 of this embodiment is equivalent to the first power shaft 20 in the first embodiment. The difference is that the two ends of the support shaft 25 are not extended out of the housing 1, while the two ends of the second power shaft 24 are extended out of the housing 1, and a second power input end 241 is provided at both ends for connecting to the pedals to provide power for the electric power-assisted transmission system. Correspondingly, a coaxially assembled input gear 240 is provided on the second power shaft 24. The input gear 240 is used to mesh with any one stage of the multi-stage driving wheel set 7. When the power drives the second power shaft 24 to rotate through the second power input end 241, the input gear 240 is connected to the multi-stage driving wheel set 7. The multi-stage driving wheel group 7 is externally meshed, and the steering direction of the multi-stage driving wheel group 7 is opposite to the steering direction of the second power shaft 24. Since the multi-stage driving wheel group 7 also needs to mesh with the multi-stage driven wheel group 8 to transmit power, a second steering change is performed here, and finally the steering direction of the first power output terminal 211 is the same as the steering direction of the second power input terminal 241. In this embodiment, the second power shaft 24 and the support shaft 25 with different axes are set, and the input gear 240 assembled on the second power shaft 24 is meshed with the multi-stage driving wheel group 7 on the support shaft 25 to achieve the steering change, so that the steering direction of the first power output terminal 211 is the same as the steering direction of the second power input terminal 241, which is different from the form in which the steering direction of the first power output terminal 211 is opposite to the steering direction of the first power input terminal 201 in the first embodiment, so that the electric power transmission system can provide more diverse steering outputs.

[0158] In order to achieve one, part, or all of the above purposes or other purposes, the present invention further provides a bicycle, which includes the above-mentioned electric power-assisted speed change system.

[0159] 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 implementation methods, or to replace some of the technical features therein with equivalents. 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. An electric power transmission system, characterized in that: include: A housing, a first power shaft that is at least partially hollow, a first shift mechanism, a transmission shaft that is at least partially hollow, a second shift mechanism, an electric power module, a second planetary gear set, a multi-stage driving wheel set, and a multi-stage driven wheel set; The first power shaft and the transmission shaft can both be rotatably connected to the housing, and the first power shaft has a first power input end with both ends extending out of the housing, and the transmission shaft has a first power output end with one end extending out of the housing; The electric power assist module includes a motor group and a first planetary gear group; the first planetary gear group includes a driving gear, a first planet carrier and a plurality of first planetary gears rotatably arranged on the first planet carrier; The stator of the motor group is fixed on the housing, the rotor of the motor group is hollowly arranged along the axial direction, the rotor is axially connected to the driving gear, the rotor is coaxially distributed with the first power shaft, and there is a distance between the rotor and the first power shaft; The first planetary gear set and the second planetary gear set share the same internal gear ring, and the internal gear ring is fixed on the housing; The first planet carrier is rotatably arranged on the first power shaft, and the first sun gear is axially arranged on the first planet carrier; a plurality of first planet gears are rotatably mounted on the first planet carrier, and the first planet gears mesh with the inner gear ring and the driving gear; A first clutch transmission assembly is provided between the first power shaft and the first sun gear; The second planetary gear set has a plurality of second planetary gears, which are fixedly connected to the multi-stage driving gear set, and the second planetary gears mesh with the inner gear ring and the first sun gear; the multi-stage driving gear set is rotatably arranged on the first power shaft; The multi-stage driven wheel set is rotatably arranged on the transmission shaft, and a second clutch transmission assembly is arranged between the transmission shaft and each stage of the multi-stage driven wheel set; The first shift mechanism has a movable first limit shaft extending into the first power shaft, and the second shift mechanism has a movable second limit shaft extending into the transmission shaft; both the first limit shaft and the second limit shaft have a shift convex portion; The first shifting mechanism can drive the first limiting shaft to make its shifting protrusion abut against the first clutch transmission component to achieve a transmission connection between the first power shaft and the first sun gear; the second shifting mechanism can drive the second limiting shaft to make its shifting protrusion abut against any of the second clutch transmission components to achieve a transmission connection between the corresponding driven wheel and the transmission shaft.

2. The electric power-assisted transmission system according to claim 1, characterized in that: The multi-stage driving wheel group includes a first driving wheel, a second driving wheel, a third driving wheel and a plurality of limit rods; 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 provided with a connecting portion in the axial direction; The second driving wheel is mounted on the connecting portion and is coaxially fixed to the first driving wheel; The plurality of limit rods are arranged corresponding to the plurality of second planetary gears, and one end of the limit rod passes through the second planetary gear and the third driving gear in sequence and is fixedly connected to the first driving gear; a third clutch transmission assembly is arranged between the first power shaft and the third driving gear; The first shift mechanism can drive the first limit shaft to make its shift convex portion abut against the third clutch transmission assembly so that the first power shaft is connected to the third driving wheel through transmission; 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.

3. The electric power-assisted transmission system according to claim 2, characterized in that: The multi-stage driving wheel set includes a third planetary gear set, and the third planetary gear set includes a second planet carrier, a second sun gear and a plurality of third planetary gears; the inner wall of the first driving wheel is provided with an inner tooth portion; The second sun gear is fixed on the housing; The second planet carrier is rotatably disposed on the first power shaft, a plurality of third planetary gears are mounted on the second planet carrier, and the third planetary gears mesh with the second sun gear and the inner gear portion; A fourth clutch transmission assembly is provided between the first power shaft and the second planet carrier; The first shift mechanism can drive the first limiting shaft to make its shift protrusion abut against the fourth clutch transmission assembly to achieve transmission connection between the first power shaft and the second planet carrier.

4. The electric power-assisted transmission system according to claim 3, characterized in that: The first power shaft and the transmission shaft are both provided with mounting holes; the first clutch transmission assembly, the third clutch transmission assembly and the fourth clutch transmission assembly are all composed of a first pawl and a second ratchet structure, the first pawl is connected with a spring sheet, and the first pawl is assembled into the mounting hole through the spring sheet, the first ratchet structure is arranged on the first sun gear, the third driving gear and the second planetary carrier, the first pawl is compressed by the spring sheet and is in a contracted state when not abutted by the shifting protrusion, and is not connected to the corresponding first ratchet structure; the first pawl is in an extended state when abutted by the shifting protrusion, and can be transmission-connected to the corresponding first ratchet structure, and an avoidance space is formed between the first pawl and the mounting hole; The second clutch transmission assembly is composed of a second pawl and a second ratchet structure, the second pawl is connected to a spring sheet, and the second pawl is assembled into the mounting hole through the spring sheet, the second ratchet structure is arranged on each level of the multi-stage slave wheel group, the second pawl is compressed by the spring sheet and is in a contracted state when not abutted by the shift protrusion, and is not connected to the corresponding second ratchet structure; the second pawl is in an extended state when abutted by the shift protrusion, and can be transmission-connected to the corresponding second ratchet structure, and there is no avoidance space between the outer wall of the second pawl and the inner wall of the mounting hole.

5. The electric power-assisted transmission system according to claim 3, characterized in that: The first shift mechanism and the second shift mechanism both include a control module and a control motor; Axially extending threaded holes are provided inside the first power shaft and the transmission shaft; The outer walls of the first limiting shaft and the second limiting shaft are both provided with external threads threadedly connected to the threaded hole; The first limiting shaft and the second limiting shaft are both provided with axially penetrating connection holes, the connection holes are connected to the rotating shaft of the control motor, and the screw can move along the axial direction of the rotating shaft of the control motor; The control module is electrically connected to the control motor.

6. The electric power-assisted transmission system according to claim 4, characterized in that: The first pawl and the second pawl are both provided with grooves connected to the spring sheet, and the first pawl and the second pawl are provided with transition inclined walls, which can abut against the transition inclined walls when the shifting protrusion moves axially.

7. The electric power-assisted transmission system according to claim 3, characterized in that: The connecting portion is an axial protrusion connected to the first driving wheel, and the outer wall of the axial protrusion and the inner wall of the second driving wheel are provided with splines that fit in with each other.

8. The electric power-assisted transmission system according to claim 7, 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 first 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; one end of the transmission shaft 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 stator of the motor group is fixed to the left cover; 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.

9. The electric power-assisted transmission system according to claim 8, characterized in that: It also includes a first reversing gear set, which includes a plurality of reversing planetary gears, a transmission frame and an output cylinder; The transmission frame is provided with an axially displaced internal gear ring and a connecting ring, and the transmission frame is fixed to the transmission 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 output cylinder is rotatably mounted on the transmission shaft, and one end of the output cylinder is provided with an external tooth portion for meshing with the reversing planetary gear, and the other end of the output cylinder passes through the housing and is provided with a second power output end.

10. An electric power transmission system, characterized in that: include: A housing, a first power shaft that is at least partially hollow, a first shift mechanism, a transmission shaft that is at least partially hollow, a second shift mechanism, an electric power module, a second planetary gear set, a multi-stage driving wheel set, a multi-stage driven wheel set, and a second reversing gear set; The first power shaft and the transmission shaft can both be rotatably connected to the housing, and the first power shaft has a first power input end with both ends extending out of the housing; The second reversing gear set comprises a transmission gear and an output gear, wherein the transmission gear is coaxially fixed on the transmission shaft, and the output gear is rotatably mounted on the first power shaft and meshes with the transmission gear; The output gear is provided with an axially extending third power output end, and the third power output end is arranged outside the housing; The electric power assist module includes a motor group and a first planetary gear group; the first planetary gear group includes a driving gear, a first planet carrier and a plurality of first planetary gears rotatably arranged on the first planet carrier; The stator of the motor group is fixed on the housing, the rotor of the motor group is hollowly arranged along the axial direction, the rotor is axially connected to the driving gear, the rotor is coaxially distributed with the first power shaft, and there is a distance between the rotor and the first power shaft; The first planetary gear set and the second planetary gear set share the same internal gear ring, and the internal gear ring is fixed on the housing; The first planet carrier is rotatably arranged on the first power shaft, and the first sun gear is axially arranged on the first planet carrier; a plurality of first planet gears are rotatably mounted on the first planet carrier, and the first planet gears mesh with the inner gear ring and the driving gear; A first clutch transmission assembly is provided between the first power shaft and the first sun gear; The second planetary gear set has a plurality of second planetary gears, which are fixedly connected to the multi-stage driving gear set, and the second planetary gears mesh with the inner gear ring and the first sun gear; the multi-stage driving gear set is rotatably arranged on the first power shaft; The multi-stage driven wheel set is rotatably arranged on the transmission shaft, and a second clutch transmission assembly is arranged between the transmission shaft and each stage of the multi-stage driven wheel set; The first shift mechanism has a movable first limit shaft extending into the first power shaft, and the second shift mechanism has a movable second limit shaft extending into the transmission shaft; both the first limit shaft and the second limit shaft have a shift convex portion; The first shifting mechanism can drive the first limiting shaft to make its shifting protrusion abut against the first clutch transmission component to achieve a transmission connection between the first power shaft and the first sun gear; the second shifting mechanism can drive the second limiting shaft to make its shifting protrusion abut against any of the second clutch transmission components to achieve a transmission connection between the corresponding driven wheel and the transmission shaft.

11. An electric power transmission system, characterized in that: include: A housing, an at least partially hollow support shaft, a first shift mechanism, an at least partially hollow transmission shaft, a second shift mechanism, an electric power assist module, a second planetary gear set, a multi-stage driving wheel set, a multi-stage driven wheel set, and a second power shaft; The second power shaft, the support shaft and the transmission shaft are all rotatably connected to the housing, the transmission shaft has a power output end with one end extending out of the housing; the second power shaft has a second power input end with both ends extending out of the housing, and the second power shaft is provided with an input gear; The electric power assist module includes a motor group and a first planetary gear group; the first planetary gear group includes a driving gear, a first planet carrier and a plurality of first planetary gears rotatably arranged on the first planet carrier; The stator of the motor group is fixed on the housing, the rotor of the motor group is hollowly arranged along the axial direction, the rotor is axially connected to the driving gear, the rotor is coaxially distributed with the support shaft, and there is a distance between the rotor and the support shaft; The first planetary gear set and the second planetary gear set share the same internal gear ring, and the internal gear ring is fixed on the housing; The first planet carrier is rotatably arranged on the support shaft, and the first sun gear is axially arranged on the first planet carrier; a plurality of first planet gears are rotatably mounted on the first planet carrier, and the first planet gears mesh with the inner gear ring and the driving gear; A first clutch transmission assembly is provided between the support shaft and the first sun gear; The second planetary gear set has a plurality of second planetary gears, the plurality of second planetary gears are fixedly connected to the multi-stage driving gear set, and the second planetary gears mesh with the inner gear ring and the first sun gear; The multi-stage driving wheel set is rotatably arranged on the support shaft, and any one stage of the multi-stage driving wheel set can be meshed with the input gear; The multi-stage driven wheel set is rotatably arranged on the transmission shaft, and a second clutch transmission assembly is arranged between the transmission shaft and each stage of the multi-stage driven wheel set; The first shift mechanism has a movable first limit shaft extending into the interior of the support shaft, and the second shift mechanism has a movable second limit shaft extending into the interior of the transmission shaft; both the first limit shaft and the second limit shaft have a shift convex portion; The first shifting mechanism can drive the first limiting shaft to make its shifting protrusion abut against the first clutch transmission component to achieve a transmission connection between the support shaft and the first sun gear; the second shifting mechanism can drive the second limiting shaft to make its shifting protrusion abut against any of the second clutch transmission components to achieve a transmission connection between the corresponding driven wheel and the transmission shaft.

12. A bicycle, characterized in that: The bicycle comprises the electric power-assisted transmission system according to any one of claims 1 to 11.

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