TWI790074B - Bicycle electronic internal transmission - Google Patents

Abstract

The invention relates to an electronic internal speed change device for a bicycle, which includes a wheel shaft, a hub, a planetary gear set and an electronic shift module. The wheel shaft is connected to the bicycle frame, and the wheel hub is penetrated by the wheel shaft and can rotate relative to the wheel shaft. The planetary gear set is arranged in the wheel hub and transmits the stepping torque to the wheel hub after changing speed, and a switching member of the planetary gear set is rotatably wrapped around the wheel shaft. The electronic shifting module is arranged on the wheel shaft and located in the hub, and selectively engages the switching element of the planetary gear set to switch the shift gear. The electronic shifting module has a shifting element and an electromagnetic actuator. The shifting element is arranged on the wheel shaft and can rotate relative to the wheel shaft to engage the switching element of the planetary gear set. An electromagnetic actuator controls rotation of the shift member. Thereby, the present invention has the advantages of simple structure, energy saving, quick speed change response, easy assembly and cost saving.

Description

Bicycle electronic internal transmission

The invention relates to a bicycle speed change device, especially a bicycle electronic internal speed change device which uses a planetary gear structure to change the reduction ratio.

Most existing bicycles are provided with a speed changer, which can change the transmission reduction ratio between the pedals and the rear wheel, so that the rider can maintain proper pedaling power and pedaling speed under different slopes and different speeds. Existing transmissions can be roughly divided into external transmission and internal transmission; the external transmission is provided with a plurality of tooth plates with different numbers of teeth on the side of the rear wheel shell, and by changing the tooth plate meshed with the chain (that is, changing the torque transmission path generated by pedaling) To change the reduction ratio; the internal transmission is to set at least one set of planetary gear structures inside the wheel housing of the rear wheel. Each planetary gear structure includes sun gears, planetary gears and outer ring gears. The sun gear moves. By fixing different gears or planet carriers in the planetary gear structure, the same speed change effect as that of the external transmission can be achieved.

The existing electronic internal transmission is to add another set of electronic controllers (including drive motor and reduction gear) to the mechanical internal transmission, and use the electronic controller to drive the exposed shifting mechanism of the internal transmission to achieve the purpose of electronically controlled transmission. For example, in our country Publication No. 201217669 "speed change mechanism" invention patent application, which mainly uses an electromagnetic switch 7 to rotate the suppressor 42 to open and close the pawl 651 of the clutch module 65, and the pawl 651 and the outer ring gear 114 and/or Or planet carrier 113 clutch, to switch speed. The so-called electromagnetic switcher 7 is composed of an induction coil 71 and a magnet 72, and the magnet 72 is also arranged in the suppressor 42, corresponding to the induction coil 71, and works essentially as a driving motor. However, existing electronic internal transmissions have the following disadvantages:

First, the drive motor controls the reduction gear to change the speed, which has a complicated structure and energy consumption, and the speed change response is slow.

Second, in order to ensure smooth shifting, the assembly tolerances of components such as reduction gears and motors are relatively high, resulting in increased costs.

Third, the overall volume of the electronic controller is large, and it is impossible to install all the components inside the wheel housing, and the exposed parts need to be waterproof and dustproof, which will further increase the cost.

Fourth, the exposed part of the electronic controller will cause special consideration of the frame size and wiring design when designing the car, and make the operation of replacing tires more complicated.

Therefore, the bicycle electronic internal speed change device of the prior art really needs to be improved.

In view of the aforementioned shortcomings and deficiencies of the prior art, the present invention provides an electronic internal transmission device for bicycles to save energy consumption, improve response speed and reduce costs.

In order to achieve the above creative purpose, the technical means used in this creation is to design a bicycle electronic internal transmission device, which is used to connect a frame and transmit the torque of a power input end. The bicycle electronic internal transmission device includes: a wheel axle, which is used to connect the frame; A hub, which is a hollow body, the hub is penetrated by the axle and can rotate relative to the axle; More than one planetary gear set, which is arranged in the hub and used to connect the power input end; the planetary gear set can constitute a first torque transmission path or a second torque transmission path, and can move along the first torque transmission path The transmission path or the second torque transmission path transmits the torque of the power input end to the hub; the planetary gear set has a switch, and the switch is rotatably wrapped around the wheel shaft; More than one electronic shifting module is arranged on the wheel shaft and located in the hub, and the electronic shifting module selectively engages the switching member of the planetary gear set so that the planetary gear set constitutes the first The torque transmission path or the second torque transmission path, the electronic shift module has a shifting member, which is arranged on the wheel shaft, and can rotate or move relative to the wheel shaft; one end of the shifting member forms an engaging block, and the engaging block is located between the wheel shaft and the shifting member of the planetary gear set , and the shifting member of the planetary gear set can be engaged with the rotation or movement of the shifting member; An electromagnetic actuator, which has a driving block that can be controlled to move linearly along an actuation direction, and the driving block selectively pushes against the shifting member to make the shifting member rotate or move relative to the axle , and then make the engaging block engage with the switching element of the planetary gear set or separate from the switching element.

The present invention is preferably the central part of the rear wheel of a general bicycle, that is to say, the wheel axle is the rear wheel axle fixed to the vehicle frame, and the rotatable hub is connected to the rim through a steel wire spoke not created in this invention. The power input end is preferably a chainring, which is connected to the chain of the bicycle, so as to transmit the pedaling force of the user to the planetary gear set.

When the present invention is installed on a bicycle, the electromagnetic actuator of the electronic shifting module is connected to an external controller with wires, and the controller can control the position of the driving block of the electromagnetic actuator, and then through the engagement of the electromagnetic shifting parts The torque transmission path of the planetary gear set is set by the block and the switching element of the planetary gear set, and different torque transmission paths mean that there are different reduction ratios from the power input end to the hub, so as to achieve the speed change effect.

The advantages of this creation are as follows:

First, the drive motor and reduction gear are replaced by electromagnetic actuators and shifting parts. The electromagnetic actuator can be a solenoid valve with a simple structure but a very fast response speed, and the shifting parts do not need to be processed to form tooth shapes, so its structure Simple and energy-saving, and the speed change response is fast.

Second, the shifting action of the electronic shifting module does not involve gear meshing, which requires lower assembly tolerances and saves costs.

Third, the electronic shift module has a simple structure and small size, and can be easily installed inside the wheel hub, so there is no need to consider waterproof and dustproof design, which can further save costs. In addition, because the electronic shift module is not exposed, the frame size and wiring design can be simplified, and tire replacement is easy.

Furthermore, in the electronic internal transmission device for bicycles, the shift member of the electronic shift module can rotate relative to the wheel shaft; the engaging block of the shift member deviates from the rotation axis of the shift member; The shifting member is elongated, and one end of the shifting member opposite to the engaging block forms a driven block, and the driven block deviates from the rotation axis of the shifting member; the driving block of the electromagnetic actuator selectively Pushing against the driven block of the shift member to rotate the shift member relative to the axle.

Furthermore, in the electronic internal transmission device for bicycles, an accommodation groove is formed on the outer ring surface of the wheel shaft; the shift member is disposed in the accommodation groove, and the shift member tends to rotate in an engaging direction so that the engaging block and the driven block of the shifting member tend to protrude from the accommodating groove, so that the engaging block engages the switching member of the planetary gear set; the driving of the electromagnetic actuator The block selectively pushes against the driven block of the shifting member so that the driven block and the engaging block are retracted in the accommodating groove, and then the engaging block is separated from the switching member.

Furthermore, in the electronic internal transmission device for bicycles, an elastic piece groove is formed on the outer ring surface of the wheel shaft; The driven block of the shift member is pushed against so that the shift member tends to rotate toward the engagement direction.

Furthermore, in the electronic internal transmission device for bicycles, the actuating direction extends along the tangential direction of the wheel shaft.

Further, in the electronic internal transmission device for bicycles, the actuating direction extends along the tangential direction of the wheel shaft; the side of the driving block facing the wheel shaft is defined as a pushing surface, and the driving block uses the pushing surface Pushing against the driven block of the shifting member; the pushing surface is recessed to form a release groove; the driving block can be controlled so that the releasing groove is aligned with the driven block of the shifting member; wherein, when When the release slot is aligned with the driven block of the gear shifter, the driven block can protrude from the accommodating slot of the axle and pass through the release slot, so that the engaging block of the gear shifter and The switch is separated.

Furthermore, in the electronic internal transmission device for bicycles, the electromagnetic actuator is an electromagnetic valve.

Further, in the electronic internal transmission device for bicycles, the two planetary gear sets are respectively defined as a first planetary gear set and a second planetary gear set; the switching element of the first planetary gear set is the first planetary gear set The sun gear of the planetary gear set; the switching member of the second planetary gear set is the sun gear of the second planetary gear set.

Referring to FIGS. 1 to 3 , the bicycle electronic internal transmission device of the present invention is used to connect to the frame of the bicycle (not shown in the figure), and is used to transmit the torque of a power input end 91 . The bicycle electronic internal transmission includes a wheel axle 10 , a wheel hub 20 , two planetary gear sets and two electronic shift modules 40 . Specifically, the wheel shaft 10 and the wheel hub 20 are the wheel shaft 10 and the wheel hub 20 of the rear wheel of the bicycle, and the power input end 91 is a chainring; the pedaling power of the rider is transmitted to the power input end through a chain (not shown in the figure). 91, and then drive the bicycle forward through the present invention.

The aforementioned axle 10 is connected to the aforementioned vehicle frame, and is specifically fixed to the vehicle frame. In this embodiment, an accommodating groove 11 and an elastic member groove 12 are formed on the outer ring surface of the wheel shaft 10 (as shown in FIG. 3 ). The wheel shaft 10 extends in the circumferential direction and is connected to the receiving groove 11 .

The aforementioned hub 20 is a hollow body, and is preferably a cylindrical shape. The hub 20 is penetrated by the hub 10 , and the hub 20 can rotate around the hub 10 . The hub 20 can be connected with a steel ring (not shown) and a tire (not shown) through steel wire spokes (not shown) to form a complete wheel.

Please refer to FIG. 2 and FIG. 6, the aforementioned two planetary gear sets are located in the hub 20, and the two planetary gear sets are respectively a first planetary gear set 30 and a second planetary gear set 30', wherein the first planetary gear set The gear set 30 is connected to the power input end 91 . The first planetary gear set 30 and the second planetary gear set 30' can jointly form a plurality of torque transmission paths, and can transmit the torque of the power input end 91 to the wheel hub 20 along one of the torque transmission paths. The first planetary gear set 30 and the second planetary gear set 30' each have a switching member 31, and the switching member 31 is rotatably wrapped around the wheel shaft 10.

The planetary gear set is a standard component in the prior art. The first planetary gear set 30 and a second planetary gear set 30' each include a sun gear, a plurality of planetary gears and an outer ring gear. The planetary gears surround the aforementioned sun gear through a planet carrier. Moving, by fixing the switching member 31 in the planetary gear set, the transmission path of the torsion force in the planetary gear set can be changed, so as to achieve the speed change effect. The specific speed change means is also the prior art, and will not be repeated here.

In this embodiment, the second planetary gear set 30' is connected in series with the first planetary gear set 30, and four different torque transmission paths can be formed by the arrangement and combination of the states of the switching elements 31 of the two; that is, by Controlling the state of the second switching member 31 of the two planetary gear sets can make the two planetary gear sets form any one of four different gears, which has the effect of four-stage speed change. The switching member 31 of the first planetary gear set 30 is preferably its sun gear, and the switching member 31 of the second planetary gear set is also preferably its sun gear.

In other preferred embodiments, the present invention can also have only one planetary gear set (for example, only the first planetary gear set 30), and at this time, the planetary gear set can form a first torque transmission path or A second torque transmission path has the effect of two-stage speed change.

Please refer to FIG. 2 to FIG. 4 and FIG. 6 , the aforementioned two electronic shifting modules 40 are arranged on the wheel shaft 10 and located in the wheel hub 20 . The two electronic shifting modules 40 can respectively engage with the two switching elements 31 of the two planetary gear sets so that the two planetary gear sets jointly constitute one of four torque transmission paths. Each electronic shift module 40 has a shift member 41 and an electromagnetic actuator 42 , and further has an elastic member 43 in this embodiment.

The shifting member 41 extends along the axial direction of the wheel shaft 10 and is rotatably disposed in the receiving groove 11 of the wheel shaft 10 relative to the wheel shaft 10 . An engaging block 411 is formed at one end of the shifting member 41 , and a driven block 412 is formed at the other end. Both the engaging block 411 and the driven block 412 protrude from one side of the shifting member 41 and deviate from the rotation axis L of the shifting member 41 . The engaging block 411 is located between the axle 10 and the corresponding switching member 31 of the planetary gear set, and can engage the corresponding switching member 31 as the shifting member 41 rotates. Please refer to FIG. 7 and FIG. 8 . Specifically, when the shifting member 41 rotates in an engaging direction D1, the engaging block 411 and the driven block 412 will protrude from the accommodating groove 11, and the engaging block 411 will Engage the corresponding switching piece 31 . More specifically, the shifting member 41 and its engaging block 411 are equivalent to the pawls of the patent application for "speed change mechanism" published in my country No. 201217669, which can be controlled to align with specific gears and/or planets on the planetary gear set. Shelves engage or disengage.

Please refer to FIG. 3 , the elastic member 43 is disposed in the elastic member groove 12 of the wheel shaft 10, and pushes against the driven block 412 of the shifting member 41 so that the shifting member 41 tends to rotate toward the engaging direction D1, and then The engaging block 411 is engaged with the corresponding switching member 31 .

Please refer to FIG. 4, FIG. 5, FIG. 11 and FIG. 12, the electromagnetic actuator 42 has a drive block 421, the drive block 421 can be controlled to move linearly along an actuation direction D2, and the actuation direction D2 is preferably Extend along the tangential direction of the axle 10. The driving block 421 can push against the driven block 412 of the shifting member 41 so that the shifting member 41 rotates opposite to the engagement direction D1, so that both the driven block 412 and the engaging block 411 are retracted into the accommodating groove of the axle 10 11, and separate the engaging block 411 from the corresponding switching member 31.

Specifically, a side of the driven block 412 facing the wheel shaft 10 is defined as a pushing surface 4211, and the driven block 412 pushes against the driven block 412 of the shifting member 41 with the pushing surface 4211, and the pushing surface 4211 is concave. A release slot 4212 is formed, and the driven block 412 can be controlled so that the release slot 4212 is aligned with the driven block 412 of the shift member 41 . When the release slot 4212 is aligned with the driven block 412, the pushing surface 4211 no longer pushes against the driven block 412, so the driven block 412 will protrude from the accommodating groove 11 of the wheel shaft 10 due to the elastic force of the elastic member 43 and pass through. In the release slot 4212 , the engaging block 411 of the shift member 41 is separated from the shift member 31 of the planetary gear set 30 .

The electromagnetic actuator 42 is preferably an electromagnetic valve, which uses an electromagnetic induction coil to drive the central armature (ie, the driving block 421 ) to move linearly.

When the present invention is installed on a bicycle (not shown), the electromagnetic actuator 42 of the electronic shift module 40 is connected to an external controller (not shown) by wires (not shown). The controller can control the position of the driving block 421 of the electromagnetic actuator 42, and then set the torque transmission path of the planetary gear set through the engaging block 411 of the shifting member 41 and the switching member 31 of the planetary gear set, and different torque transmission The path means that there are different speed reduction ratios from the power input end 91 to the hub 20 , so as to achieve the speed change effect.

Please refer to FIG. 6 to FIG. 8 , specifically, one of the electronic shifting modules 40 can be engaged with or separated from the switching member 31 of the first planetary gear set 30 , so that the switching of the first planetary gear set 30 The part 31 has two states, that is, the switching part 31 is fixed on the wheel shaft 10 or the switching part 31 can rotate relative to the wheel shaft 10 . Please refer to Fig. 6, Fig. 9 and Fig. 10, at the same time, another electronic shift module 40 can be engaged with or separated from the switching element 31 of the second planetary gear set 30', so that the second planetary gear set 30' The switching member 31 has two states, that is, the switching member 31 is fixed on the wheel shaft 10 or the switching member 31 can rotate relative to the wheel shaft 10 . The two states of the first planetary gear set 30 are multiplied by the two states of the second planetary gear set 30' so that the two planetary gear sets 30 can combine four different torque transmission paths. In short, the controller can set the two planetary gear sets to any one of the four gears through the two electronic shifting modules 40 .

Other implementation aspects of the present invention are as follows:

First, the shifting member 41 is not limited to the rotation relative to the wheel shaft 10, but can also be designed to move relative to the wheel shaft 10, for example, to move linearly along the radial direction of the wheel shaft 10, so that the shifting member 41 can also engage the switching member of the planetary gear set to play the shifting effect.

Second, the elastic member 43 can be omitted, and the driving block 421 of the electromagnetic actuator 42 can directly make the engaging block 411 of the shifting member 41 protrude or retract into the receiving groove 11 .

Third, the actuating direction D2 of the driving block 421 is not limited to extend along the tangential direction of the wheel shaft 10 , for example, it may be the case that the actuating direction D2 is designed to be along the axial or radial direction of the wheel shaft 10 .

Other advantages of this creation are as follows:

First, by designing the shifting member 41 to tend to rotate in a specific direction, the engaging block 411 tends to protrude from the accommodating groove 11 and engage the shifting member 31 of the planetary gear set, and specifically through the elastic member 43 to achieve the above design, when the electronic shifting module 40 fails, the engaging block 411 will be driven by the elastic member 43 or other forces to continuously engage the switching member 31, which can avoid the shift due to the unstable position of the engaging block 411. The position jumps randomly and even the mechanism is stuck and the ride cannot be done at all.

Second, the advantage of extending the actuating direction D2 of the driving block 421 along the tangential direction of the wheel shaft 10 is that the reaction force from the driven block 412 of the shifting member 41 will not cause the driving block 421 to move along the actuating direction D2, so the electromagnetic actuation The actuator 42 only needs power supply at the moment of moving the position of the driving block 421, and the driving block 421 does not need to continuously supply power to the electromagnetic actuator 42 after the driving block 421 is moved to the position, thereby making the present invention energy-saving and prolonging the service life of the electromagnetic actuator 42 .

In summary, the present invention replaces the driving motor and the reduction gear of the prior art with the electromagnetic actuator 42 and the shifting member 41, wherein the electromagnetic actuator 42 can be a solenoid valve with a simple structure but a very fast response speed (ie The core component of the electromagnetic valve uses the electromagnetic induction coil to drive the central armature to move linearly), and the shift member 41 does not need to be processed to form a tooth shape, so its structure is simple and energy-saving, and the speed change response is fast. Furthermore, the gear shifting action of the electronic gear shifting module 40 does not involve gear meshing, which requires lower assembly tolerances and saves costs. In addition, the electronic shifting module 40 has a simple structure and a small volume, and can be easily installed inside the hub 20 , so there is no need to consider waterproof and dustproof design, which can further save costs. Finally, because the electronic shift module 40 is not exposed, the design of the size of the vehicle frame and wiring can be simplified, and tires can be replaced easily.

The above description is only a preferred embodiment of this creation, and does not impose any formal restrictions on this creation. Although this creation has been disclosed as above with a preferred embodiment, it is not used to limit this creation. Anyone in the technical field has Ordinary knowledgeable persons, without departing from the scope of this creative technical solution, may use the technical content disclosed above to make some changes or modify them into equivalent embodiments with equivalent changes. However, any content that does not deviate from this creative technical solution, according to The technical essence of the creation Any simple modification, equivalent change and modification made to the above embodiments still belong to the scope of the technical solution of the creation.

10: Axle 11: storage tank 12: Elastic slot 20: hub 30: The first planetary gear set 30': Second planetary gear set 31: switch parts 40:Electronic shift module 41: Shift parts 411: snap block 412: driven block 42: Electromagnetic actuator 421: drive block 4211: pushing surface 4212: release slot 43: Elastic parts 91: Power input end L: axis of rotation D1: snapping direction D2: Action direction

Fig. 1 is the perspective view of the present invention. Fig. 2 is an exploded view of most of the components of the present invention. FIG. 3 is an exploded view of the electronic shifting module of the present invention. 4 and 5 are three-dimensional action diagrams of the electronic shifting module of the present invention, showing that the engaging block engages the shifting member of the planetary gear set with the rotation of the shifting member. Fig. 6 is a schematic cross-sectional view of the present invention. Figures 7 to 8 are sectional action diagrams of the present invention along the A-A section line of Figure 6, showing that the engaging block of one of the electronic shifting modules engages the switching of the first planetary gear set with the rotation of the shifting member pieces. Figures 9 to 10 are sectional action diagrams of the present invention along the B-B secant line of Figure 6, showing that the engaging block of another electronic shifting module engages the switching of the second planetary gear set with the rotation of the shifting member pieces. Figures 11 to 12 are sectional action diagrams of the present invention along the C-C section line of Figure 6, showing that the two driven blocks of the two electronic shift modules rotate with the movement of the driving block of the electromagnetic actuator and protrude from the wheel shaft of the outer ring.

10: Axle

20: hub

30: The first planetary gear set

30': Second planetary gear set

40:Electronic shift module

41: Shift parts

42: Electromagnetic actuator

421: drive block

91: Power input end

Claims (10)

An electronic internal transmission device for a bicycle, used to connect a frame and transmit torque at a power input end, the electronic internal transmission device for a bicycle includes: a wheel axle, which is used to connect the frame; A hub, which is a hollow body, the hub is penetrated by the axle and can rotate relative to the axle; More than one planetary gear set, which is arranged in the hub and used to connect the power input end; the planetary gear set can constitute a first torque transmission path or a second torque transmission path, and can move along the first torque transmission path The transmission path or the second torque transmission path transmits the torque of the power input end to the hub; the planetary gear set has: a switching member, which rotatably surrounds the axle; More than one electronic shifting module is arranged on the wheel shaft and located in the hub, and the electronic shifting module selectively engages the switching member of the planetary gear set so that the planetary gear set constitutes the first The torque transmission path or the second torque transmission path, the electronic shift module has a shifting member, which is arranged on the wheel shaft, and can rotate or move relative to the wheel shaft; one end of the shifting member forms an engaging block, and the engaging block is located between the wheel shaft and the shifting member of the planetary gear set , and can engage the shifting member of the planetary gear set with the rotation or movement of the shifting member; An electromagnetic actuator, which has a driving block that can be controlled to move linearly along an actuation direction, and the driving block selectively pushes against the shifting member to make the shifting member rotate or move relative to the axle , and then make the engaging block engage with the switching element of the planetary gear set or separate from the switching element. The bicycle electronic internal transmission device as described in claim 1, wherein The shift member of the electronic shift module can rotate relative to the axle; The engaging block of the shifting member deviates from the rotation axis of the shifting member; The shifting member is elongated, and a driven block is formed at one end of the shifting member opposite to the engaging block, and the driven block deviates from the rotation axis of the shifting member; The driving block of the electromagnetic actuator selectively pushes against the driven block of the shifting member to rotate the shifting member relative to the axle. The bicycle electronic internal transmission device as described in claim 2, wherein An accommodating groove is formed on the outer ring surface of the axle; The shifting member is disposed in the accommodating groove, and the shifting member tends to rotate in an engaging direction so that the engaging block and the driven block of the shifting member tend to protrude from the accommodating groove, thereby making the engaging block is engaged with the switching element of the planetary gear set; The driving block of the electromagnetic actuator selectively pushes against the driven block of the shifting member so that the driven block and the engaging block are retracted in the accommodating groove, thereby making the engaging block and the engaging block The switch is separated. The bicycle electronic internal transmission device as described in claim 3, wherein An elastic member groove is formed on the outer ring surface of the axle; The electronic shifting module has an elastic member, which is arranged in the elastic member groove of the wheel shaft, and pushes against the driven block of the shifting member to make the shifting member tend to rotate toward the engaging direction. The bicycle electronic internal transmission device according to claim 2, wherein the actuating direction extends along the tangential direction of the wheel shaft. The bicycle electronic internal transmission device according to claim 3, wherein the actuating direction extends along the tangential direction of the wheel shaft. The bicycle electronic internal transmission device as described in claim 3, wherein the direction of action extends along a tangent to the axle; A side of the driving block facing the wheel shaft is defined as a pushing surface, and the driving block pushes against the driven block of the shifting member through the pushing surface; The pushing surface is recessed to form a release groove; The driving block can be controlled so that the release groove is aligned with the driven block of the shifting member; Wherein, when the release groove is aligned with the driven block of the shifting member, the driven block can protrude from the accommodating groove of the axle and pass through the releasing groove, so that the locking of the shifting member The combined block is separated from the switching piece. The bicycle electronic internal transmission device according to claim 1, wherein the electromagnetic actuator is an electromagnetic valve. As for the bicycle electronic internal transmission device described in any one of claims 1 to 8, the planetary gear sets are two sets, which are arranged in the hub and used to connect the power input end; the two planetary gear sets can form A plurality of torque transmission paths can be formed together, and the torque of the power input end can be transmitted to the hub along one of the torque transmission paths; There are two sets of electronic shifting modules, which are arranged on the wheel shaft and located in the hub. The two electronic shifting modules respectively selectively engage the two switching elements of the two planetary gear sets to make the planetary gears The group constitutes one of the torsion transmission paths. The bicycle electronic internal transmission device as described in Claim 9, wherein The two planetary gear sets are respectively defined as a first planetary gear set and a second planetary gear set; the switching member of the first planetary gear set is a sun gear of the first planetary gear set; The switching element of the second planetary gear set is the sun gear of the second planetary gear set.

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