TWM661782U - Electronic gear shifting system for electric assist bicycles - Google Patents

Abstract

The invention provides an electronic transmission system for an electric power-assisted bicycle, which includes: an input unit having a crank, a middle shaft, a one-way clutch and a large plate gear set; the middle shaft is driven to the large plate gear set by the one-way clutch; the middle shaft is provided with a sensor to detect the rotation speed of the middle shaft; an output unit having a flywheel gear set, a freehub, a connecting component and a hub, and the transmission unit is transmitted between the large plate gear set and the flywheel gear set, and has a plurality of gears; the freehub is connected to the hub through a connecting component, and the connecting component can be a bidirectional or unidirectional transmission component; a hub motor is correspondingly driven to the hub, and the hub motor A sensing device is provided for correspondingly detecting the transmission speed; thereby, when the bicycle is moving, no matter whether the rider is pedaling or not, the freewheel base can be rotated to drive the transmission unit, so that the transmission unit can be driven to change gears in any state, and at the same time, the one-way clutch can be used to prevent the transmission to the middle shaft, so as to improve the safety when riding; and a controller can be used to establish a judgment condition based on the sensing information of the sensor and the sensing device, and then a better gear switching can be judged, so that the gear of the transmission unit can be adjusted accordingly through the speed change device, so as to improve the comfort and convenience of the user when riding.

Description

Electronic transmission system for electric-assisted bicycles

This invention provides an electronic transmission system for an electric assist bicycle, in particular a vehicle that provides auxiliary driving force through a wheel motor and can switch gears based on sensing information through a transmission device.

According to the current electric assisted bicycles, the auxiliary power devices can be divided into two types: mid-mounted motors and wheel-mounted motors. The common mid-mounted motors are mostly integrated devices. The products that integrate the controller and the motor have the advantages of good maneuverability and sensitive response. However, the driving force of the human drive and the electric assist is accumulated on the transmission device, causing excessive chain load, facing the rapid wear of the transmission device and increased risk of chain breakage, and in non-electronic The transmission device must be equipped with a gear position sensor to provide a gear shift signal so that the controller can temporarily cut off or reduce the power output to prevent excessive chain tension from causing damage to the transmission and shifting device. The wheel motor was developed earlier, and its motor rotor can directly drive the wheel or directly drive the wheel through the output of the reduction unit, which can reduce the load of the transmission device and increase its service life. It has the advantages of simple structure, low cost and high frame compatibility.

In addition, most types of vehicles have a speed change function to suit a variety of users and terrains. The speed change device used for vehicle speed change usually includes an external speed changer and an internal speed changer. The external speed changer has a longer development history and has the advantages of lower cost and more gears. It has always been the most common speed change device for bicycles. However, the shifting conditions of the external speed changer must ensure that the gears can be changed when the rider is pedaling. Otherwise, the speed change device will not be able to drive the chain to move, causing the external speed changer to be limited by the rider's behavior pattern, which is not conducive to the introduction of automatic speed change programs. However, the shifting conditions of the internal speed changer are not limited in this way. The gear shifting timing is more flexible, and it is easier to implement intelligent automatic gear shifting programs. It is also the key direction of the development of bicycle electrification and intelligence in recent years.

In response to changes in riding road conditions, when facing a sharp downhill or sudden braking, the rider will not pedal, but the vehicle speed will change drastically in a short period of time. When the rider pedals again, the improper gear position may cause problems such as stepping on empty gear or overloading, which seriously affects riding comfort and safety. In this regard, how to respond to the limitations of riding behavior and external transmission characteristics and introduce automation and intelligence is a goal that the industry urgently needs to break through.

In view of this, the author of the present invention has specifically studied and improved the gear shifting of electric assisted bicycles, especially the automatic gear judgment and gear shifting structure during coasting, in order to improve the above problems with a better creation. After long-term research and development and continuous testing, this creation was finally released.

Therefore, this invention is to solve the above problems. To achieve the above purpose, we, the creators, provide an electronic speed change system for an electric power-assisted bicycle, which includes: an input unit, which has a crank, a middle shaft, a one-way clutch and a large plate gear set; the crank is arranged at both ends of the middle shaft, and the middle shaft is unidirectionally transmitted to the large plate gear set through the one-way clutch; the middle shaft is provided with a sensor, and the sensor is used to detect the rotation speed of the middle shaft; an output unit, which has a flywheel gear set, a freehub, a connecting component and a hub, the large plate gear set is connected to the flywheel gear set by a transmission unit for corresponding transmission, and the The transmission unit forms a plurality of gears with the large plate gear set and the flywheel gear set; the freewheel base is correspondingly configured with the flywheel gear set; one side of the freewheel base is connected to the hub through the connecting component; a hub motor is correspondingly driven on the hub, and the hub motor is provided with a sensing device for correspondingly detecting its transmission speed; a shifting device is correspondingly connected to and controls the gear of the transmission unit; and a controller, whose signal is connected to the sensor, the sensing device, the hub motor and the shifting device; and is used to correspondingly adjust the gear of the transmission unit through the shifting device according to the sensing information of the sensor and the sensing device.

According to the electronic transmission system of the electric power-assisted bicycle described above, the connecting component is a two-way transmission component or a one-way transmission component; and when the connecting component is a two-way transmission component, the controller detects the transmission speed of the hub motor according to the sensing device, and when the transmission speed increases, the gear is correspondingly increased, and when the transmission speed decreases, the gear is correspondingly decreased; and when the connecting component is a one-way transmission component, the freehub is unidirectionally transmitted to the hub through the connecting component, and the controller detects the rotation of the middle shaft according to the sensor. The gear ratio of the large plate gear set and the flywheel gear set under the gear position is determined according to the gear ratio, and when the speed of the middle shaft converted by the gear ratio is lower than the transmission speed of the wheel hub motor detected by the sensing device, the wheel hub motor is driven accordingly, and when the transmission speed increases, the gear position is increased accordingly, and when the transmission speed decreases, the gear position is decreased accordingly; and when the speed of the middle shaft converted by the gear ratio is equal to the transmission speed, the gear position is directly increased when the transmission speed increases, and when the transmission speed decreases, the gear position is decreased accordingly.

According to the electronic transmission system of the electric assist bicycle described above, when the connecting component is a one-way transmission component, a rotor is provided in the wheel hub motor, the rotor is transmission-connected to a reduction unit, and the reduction unit is transmission-connected to the tower base corresponding to the reduction at one end of the rotor.

According to the electronic transmission system of the electric power-assisted bicycle described above, the input unit further includes a tooth claw, which is provided with a tooth plate, a claw plate and the one-way clutch. The tooth plate is connected to the middle shaft corresponding to the synchronous transmission, and the claw plate is coaxially arranged with the tooth plate and connected to the large plate gear set corresponding to the synchronous transmission. The one-way clutch is arranged between the tooth plate and the claw plate to allow the tooth plate to transmit unidirectionally to the claw plate.

According to the electronic transmission system of the electric power-assisted bicycle described above, the one-way clutch is a gear-type disc clutch, a pawl clutch, a roller clutch or an actuator clutch.

According to the electronic transmission system of the electric power-assisted bicycle described above, the hub motor is arranged at at least one of the front wheel or the rear wheel of a bicycle; and when the hub motor is arranged at the front wheel of the bicycle, the connecting component is a two-way transmission component.

According to the electronic transmission system of the electric power-assisted bicycle described above, the large plate gear set has a plurality of gears, and the flywheel gear set has a plurality of gears, the number of teeth of the gears and the gears are arranged differently and arranged in sequence along the axial direction, and the transmission unit is connected to different gears or gears to form different gears accordingly.

According to the electronic transmission system of the electric assisted bicycle described above, the transmission device is an external transmission, and is at least one of the front transmission or the rear transmission, and can be driven directly or indirectly by electricity, and the indirect method is to operate through the transmission cable.

According to the electronic speed change system of the electric-assisted bicycle described above, the sensor is a speed sensing element or a torque sensing element based on magnetism or optics.

According to the electronic transmission system of the electric power-assisted bicycle described above, the sensing device is correspondingly arranged inside or outside the wheel motor, and the sensing device is a speed sensing element or a torque sensing element based on magnetism or optics.

According to the electronic speed change system of the electric power-assisted bicycle described above, the controller is connected to the sensor, the sensing device, the wheel motor and the speed change device by signal via a wired or wireless method.

From the above description and settings, it is clear that this creation has the following advantages and functions, which are described in detail as follows:

1. This invention uses the setting of the connecting component. When the connecting component is configured as a two-way transmission component, when the electric assist bicycle is in a sliding state, the rotating hub can be used to drive the freehub to rotate synchronously through the connecting component, so that the flywheel gear set on the freehub drives the transmission unit to rotate the large plate gear set; and when the connecting component is configured as a unidirectional transmission component, since the freehub is unidirectionally transmitted to the hub, the hub in the sliding state will be The freehub rotates separately, and at this time the freehub can be driven to rotate by the rotor of the wheel hub motor via the reduction unit, so that the freehub speed is lower than the hub speed. Without affecting the driving speed, the flywheel gear set on the freehub can drive the transmission unit to rotate the large plate gear set. In this way, the transmission unit can operate in any state, and the speed change device can perform the gear change operation of the transmission unit in any state of moving or sliding.

2. This invention uses the one-way clutch of the claw to provide driving force when the rider pedals, and the crank connected to the middle shaft rotates, causing the claw plate of the claw to rotate through the one-way clutch, and the transmission unit is connected to the output unit; and when the rider is gliding or not pedaling, the output unit drives the large plate gear set to drive the claw plate of the claw to rotate, and the one-way clutch is used to separate the claw plate of the claw from the gear plate, preventing the output end driving force from being transmitted to the crank, avoiding affecting the rider's pedaling posture, and improving the safety during riding.

3. This invention detects the rotation speed of the middle shaft (i.e., pedaling frequency information) through the sensor, and can detect the transmission speed of the wheel motor (i.e., wheel speed) through the sensor device, and can judge the gear change conditions through the controller, and automatically provide the best gear change operation, which helps to realize the effects of intelligence and automation, and can improve the user's riding comfort and the convenience of gear switching.

This invention is an electronic speed change system for an electric power-assisted bicycle. Its implementation methods, features and effects are described in detail below with several preferred feasible embodiments and accompanying diagrams, so that you can have a deep understanding of and agree with this invention.

First, please refer to Figure 1. This invention is an electronic speed change system for an electric-assisted bicycle, which includes:

An input unit 1 has a crank 11, a middle shaft 12, a one-way clutch 131 and a large plate gear set 14; the crank 11 is arranged at both ends of the middle shaft 12, and the middle shaft 12 is unidirectionally transmitted to the large plate gear set 14 through the one-way clutch 131; the middle shaft 12 is provided with a sensor 122, and the sensor 122 is used to detect the rotation speed of the middle shaft 12, so as to obtain the pedaling frequency information transmitted to the middle shaft 12 by the user through stepping on the crank 11;

In one embodiment, the configuration of the one-way clutch 131 is that the input unit 1 further includes a tooth claw 13, the tooth claw 13 is provided with a tooth plate 132, a claw plate 133 and the one-way clutch 131, the tooth plate 132 is synchronously connected to the middle shaft 12, and the claw plate 133 is coaxially arranged with the tooth plate 132, and The corresponding synchronous transmission is connected to the large plate gear set 14, and the one-way clutch 131 is arranged between the gear plate 132 and the claw plate 133, so as to make the gear plate 132 unidirectionally transmit to the claw plate 133, so that the driving force of the large plate gear set 14 cannot be transmitted to the middle shaft 12, and the driving force of the middle shaft 12 can be transmitted to drive the large plate gear set 14;

An output unit 2 is provided with a flywheel gear set 21, a freewheel base 22, a connecting member 23 and a hub 24. The large plate gear set 14 is connected to the flywheel gear set 21 through a transmission unit 6 for corresponding transmission, and the transmission unit 6 forms a plurality of gears with the large plate gear set 14 and the flywheel gear set 21; the freewheel base 22 is correspondingly configured with the flywheel gear set 21; one side of the freewheel base 22 is connected to the hub 24 through the connecting member 23; and in one embodiment, the hub 24 is covered and connected to the outer edge of the connecting member 23 to prevent foreign matter from intruding;

In terms of the formation of the gear position, it is known that the large plate gear set 14 has a plurality of gears 141, and the flywheel gear set 21 has a plurality of gears 211, and the transmission unit 6 can be a chain to link and transmit between the large plate gear set 14 and the flywheel gear set 21, and can be connected to different gears 141 or gears 211 to form different gear positions;

A hub motor 3 is disposed inside the hub 24 and correspondingly drives the hub 24. The hub motor 3 is provided with a sensing device 34 for correspondingly detecting its transmission speed, thereby obtaining wheel speed information of the bicycle 7 to which it is disposed. The hub motor 3 mainly provides electric driving assistance for the bicycle 7, so that it can be driven by human pedaling, and at the same time, the hub motor 3 can provide auxiliary assistance. In one embodiment, the bicycle 7 can be a two-wheeled bicycle with pedals, a truck-type bicycle, a standing bicycle, a recumbent bicycle, a hand-cranked bicycle, and a flywheel exercise bicycle, but these are only examples and are not intended to be limiting.

As for the configuration of the hub motor 3, in one embodiment, the hub motor 3 is configured at least one of the front wheel 71 or the rear wheel 72 of a bicycle 7; and when the hub motor 3 is configured at the front wheel 71 of the bicycle 7, the connecting member 23 is a two-way transmission member; and the hub motor 3 is provided with a stator 31 and a rotor 32, wherein the stator 31 is mainly positioned at the axle 25 of the front wheel 71 or the rear wheel 72 of the bicycle 7, and the sensing device 34 can be fixed at a suitable position of the stator 31 to detect the rotation speed of the adjacent hub 24;

When the hub motor 3 is disposed on the rear wheel 72 to drive the rear wheel 72, the connecting member 23 can be configured as a one-way transmission member, such as a one-way wheel or a one-way clutch device. In other embodiments, it can also be a two-way transmission member, but the one-way transmission member is still preferred. When the connecting member 23 is a one-way transmission member, the rotor 32 can be connected to a reduction unit 33 through transmission, and the reduction unit 33 is connected to the tower base 22 corresponding to the reduction transmission at one end of the rotor 32. In one embodiment, the reduction unit 33 can be a reduction device of a planetary gear train, which has a planet carrier 333 and can be fixed to the rear The axis 25 of the wheel 72, the planet carrier 333 is equipped with a plurality of planetary gears 332, and the inner edges of the planetary gears 332 correspond to a sun gear 331, and the outer edges of the planetary gears 332 correspond to a ring gear 334; the rotor 32 is connected to the sun gear 331 to rotate, and the ring gear 334 can be driven by the planetary gears 332, and the ring gear 334 is correspondingly connected to the freehub 22 to rotate synchronously, thereby, the hub motor 3 can be transmitted to the freehub 22 through the rotor 32 and the reduction unit 33, and at the same time, the hub 24 can be driven to rotate by the connecting member 23 to provide auxiliary power;

When the hub motor 3 is disposed on the front wheel 71 to drive the front wheel 71, at this time, the connecting component 23 must be a two-way transmission component so that the hub 24 and the freewheel base 22 can be transmitted synchronously, so as to ensure that when the bicycle 7 is in a sliding state, its driving force can still be output through the output unit 2 and rotate.

A transmission device 5 is connected to and controls the gear of the transmission unit 6; in a specific embodiment, it can be arranged correspondingly on the large plate gear set 14 and the flywheel gear set 21, and can be positioned on the frame 73 of the bicycle 7, so as to shift the transmission unit 6 along the axial direction of the large plate gear set 14 and the flywheel gear set 21, and then the gear can be switched. When the gear is changed, the transmission unit 6 can be shifted by one of its gears 141 or gear 211. , by axially moving and disengaging the original gear 141 or gear 211 to engage with the gear 141 or gear 211 of the corresponding gear to complete the gear shifting action. Therefore, it can be known that the transmission device 5 can be an external transmission, and is at least one of the front transmission or the rear transmission; in addition,; and the transmission device 5 in one embodiment can directly or indirectly drive the transmission unit 6 through electricity, and its indirect method is to be operated through a transmission cable.

A controller 4, whose signal is connected to the sensor 122, the sensing device 34, the wheel motor 3 and the speed change device 5, is used to adjust the gear of the transmission unit 6 through the speed change device 5 according to the sensing information of the sensor 122 and the sensing device 34; in one embodiment, the controller 4 can be connected to the sensor 122, the sensing device 34, the wheel motor 3 and the speed change device 5 by a signal in a wired or wireless manner, so as to adjust the gear of the transmission unit 6 according to the sensing information of the sensor 122 and the sensing device 34. The controller 4 is configured according to the wiring requirements; thereby, the controller 4 can obtain the pedaling speed through the sensor 122 of the middle shaft 12, and calculate the speed of the freehub 22 according to the gear ratio of the large plate gear set 14 and the flywheel gear set 21 corresponding to the gear 141 and the gear 211, and at the same time compare its transmission speed with the sensing device 34 of the wheel hub motor 3, so as to judge whether the vehicle is in a coasting state, and drive the wheel hub motor 3 and the transmission device 5 according to the gear shifting conditions.

Thus, when the rider applies pedaling force to drive the bicycle 7 in a moving state, the power flows from the crank 11 to drive the middle shaft 12, the tooth claw 13, the large plate gear set 14, the transmission unit 6, the flywheel gear set 21, the freewheel body 22, the connecting component 23 to the hub 24 for output, and the controller 4 can drive the wheel hub motor 3 to provide driving assistance according to the moving speed;

When the rider stops pedaling and the bicycle 7 is in a sliding state, and the connecting member 23 is a two-way transmission member, it is defined as an SC configuration. At this time, the driving force of the sliding of the bicycle 7 will rotate the hub 24, the connecting member 23, the freewheel body 22, the flywheel gear set 21, the transmission unit 6, and the large plate gear set 14 in sequence, wherein the tooth 13 can prevent the sliding driving force from forcing the middle shaft 12 to rotate through its one-way clutch 131; and if the connecting member 23 is a one-way transmission member in the sliding state, it is an SU configuration. In this case, the sliding driving force cannot The signal is transmitted to the freewheel base 22 through the hub 24, and the controller 4 is used to drive the wheel motor 3 installed in the hub 24, so that the rotor 32 rotates the freewheel base 22 through the reduction unit 33. The rotation speed of the freewheel base 22 must be lower than the rotation speed of the hub 24. In addition, the rotation of the freewheel base 22 will also synchronously drive the flywheel gear set 21, the transmission unit 6, and the large plate gear set 14 to rotate. With this configuration, the present invention can be used in the process of moving the bicycle 7. Regardless of whether the user applies pedaling force, the transmission unit 6 can be in a transmission state, so that the transmission device 5 can operate the transmission unit 6 at any time to switch gears.

Please refer to Figures 4 to 5. As for the shifting process, first, the controller 4 must confirm that the wheel of the bicycle 7 is in a rotating state according to the signal of the sensor device 34 of the wheel hub motor 3, and its rotation determination condition meets the following mathematical formula 1; secondly, according to the signal of the sensor 122 of the middle shaft 12, and the relationship between the number of teeth (gear ratio) of the large plate gear set 14 and the corresponding tooth plate 141 of the flywheel gear set 21 of the current gear, and the relationship between the wheel diameter of the corresponding wheel set of the sensor device 34 and the wheel diameter of the hub 24, it is confirmed whether the bicycle 7 is in a sliding state. If it meets the following mathematical formula 2, it is in a sliding state; then, the gear can be upshifted or downshifted according to the change of the increase or decrease of the wheel speed. Specifically, for example, a threshold value can be set so that when the wheel speed reaches the set threshold value, the controller 4 commands the transmission device 5 to adjust the gear to upshift or downshift. The planning of the gear change needs to be based on the number and number of teeth of the large plate gear set 14 and the flywheel gear set 21. For example, the large plate gear set When the flywheel gear set 21 is provided with two gears 141 with different numbers of teeth, and the flywheel gear set 21 is provided with seven gears 211 with different numbers of teeth, the number of gears is the product of the number of gears 141 of the two gear sets, which is a total of fourteen gears. Within the speed limit of the local bicycle law, the gear ratio of each gear is appropriately allocated, which can be used as the threshold value of the gear shift condition;

【Mathematical formula 1】 H (rpm) ＞ 0

【Mathematical formula 2】 B (rpm) × T / t ＜ H (rpm)

Among them, H is the rotation speed of the hub 24; B is the rotation speed of the middle shaft 12; T is the number of teeth of the current gear position gear 141 of the large plate gear set 14; t represents the number of teeth of the current gear position gear 211 of the flywheel gear set 21.

In addition, there is another driving condition, which is used when the connecting member 23 is a SU configuration of a one-way transmission member, the hub motor 3 is arranged in the hub 24, and the driving force of the rotor 32 can be transmitted to the freehub 22. The driving condition can be made to meet the following mathematical formula 3, wherein, if the reduction unit 33 is not provided between the rotor 32 and the freehub 22, it is a motor direct drive method, and the reduction ratio R of the direct drive method is equal to 1;

【Mathematical formula 3】 M (rpm) / R ＜ H (rpm)

Wherein, M is the rotation speed of the rotor 32 of the hub motor 3; and R is the reduction ratio of the reduction unit 33.

In the above mathematical formulas 1 to 3, if the wheel diameter of the corresponding wheel of the sensing device 34 is different from the wheel diameter of the hub 24, the rotation speed detected by the sensing device 34 must be compensated according to the wheel diameter ratio, and the rotation speed of the hub 24 can be obtained, as shown in the following mathematical formula 4:

【Mathematical formula 4】 H (rpm) = S (rpm) × Ds (mm) / Dh (mm)

Among them, S is the rotation speed of the wheel corresponding to the sensing device 34 of the hub motor 3, Ds is the wheel diameter of the wheel corresponding to the sensing device 34, and Dh is the wheel diameter of the hub 24 corresponding to the wheel.

By means of the signals from the sensing device 34 of the wheel motor 3 and the sensor 122 of the middle shaft 12, the controller 4 can obtain the pedaling frequency and wheel speed information as described above, and can confirm the riding state of the vehicle, when the rider applies pedaling force to drive the bicycle 7 in a moving state, or when the rider stops pedaling and the bicycle 7 is in a sliding state and the connecting member 23 is an SC-type When the gear is in the transmission state, the large plate gear set 14, the transmission unit 6 and the flywheel gear set 21 are all in the transmission state. When the gear is in the transmission state, the gear can be changed. Therefore, when the gear is changed, the gear change process can drive the transmission device 5 to perform the corresponding upshift or downshift according to the rotation judgment condition and the change of the wheel speed increase or decrease; and when the rider stops pedaling and the bicycle 7 is in the sliding state and the connecting component 23 is the SU configuration of the one-way transmission component, the rotation judgment condition is established. Because the connecting component 23 is a one-way transmission component, the driving force of the sliding cannot be transmitted from the hub 24 to the freewheel base 22; therefore, the sliding judgment condition of the mathematical formula 2 must be confirmed. When the condition is established, the controller 4 can drive the setting according to the driving condition. The hub motor 3 in the hub 24 rotates the freewheel base 22 through the speed reduction unit 33. The speed of the freewheel base 22 is slower than that of the hub 24. Therefore, the shifting driving force of the hub motor 3 will not be transmitted from the freewheel base 22 to the hub 24 through the connecting member 23. At the same time, the large plate gear set 14, the transmission unit 6 and the flywheel gear set 21 are all in a transmission state.

If the coasting condition of mathematical formula 2 is not satisfied, it means that the driving force of the input unit 1 drives the rotation of the output unit 2. At this time, the large plate gear set 14, the transmission unit 6 and the flywheel gear set 21 of the transmission device are all in the transmission state, and according to the rotation judgment condition of the aforementioned mathematical formula 1 and the change of the increase or decrease of the wheel speed, the transmission device 5 can be driven to perform a corresponding upshift or downshift. After completing the gear change, the controller 4 can stop driving the wheel hub motor 3 to save electricity. In summary, when the bicycle 7 moves forward due to the driving force of human power, electric power or inertial force, there is no need to limit the human driving behavior of the rider, and the present invention can perform the gear shifting operation at any time.

Please refer to FIGS. 6 to 8. In a specific embodiment, the goal is to obtain a more accurate human-driven torque to provide the controller 4 with a better motor drive and gear shifting timing. Therefore, the present invention is preferably in the input unit 1, where the crank 11 and the tooth 13 are set as two-pieces, wherein the crank 11 is fixedly mounted on both sides of the middle shaft 12, and the middle shaft 12 is provided with a tooth 121 and a sensor 122. The sensor 122 can be a speed sensing element or a torque sensing element based on magnetism or optics, and is fixed to a suitable position of the frame 73 of the bicycle 7, and is used to detect the rotation speed of the middle shaft 12, and can detect the relative position change between the middle shaft 12 and the tooth 121. The size of the deformation or deformation can be used to know the torque of the rotation, and the signal can be transmitted by wire or wirelessly to provide relevant information of the sensing; and the claw 13 is as mentioned above, which can be divided into a gear plate 132, a claw plate 133 and a one-way clutch 131; wherein the gear plate 132 is provided with a spline 1321 to correspond to the tooth portion 1 connected to the middle shaft 12 21, for synchronously transmitting driving force, and fixing the gear plate 132 to the middle shaft 12 by a nut to prevent axial sliding, the tooth plate 141 of the large plate gear set 14 can be fixed on the claw plate 133 by screws and screw columns to rotate synchronously; and the technical principles of torque and speed sensing are familiar technologies, so they are not elaborated here.

As for the configuration of the tooth claw 13, the one-way clutch 131 in one embodiment can be one of a tooth-type disc clutch, a pawl clutch, a roller clutch and an actuator clutch. In a preferred embodiment, the one-way clutch 131 is a tooth-type disc clutch. As shown in FIG. 7, the spline 1321 of the tooth plate 132 is used to receive the power of human drive, and the tooth plate 132 has a transmission portion 1322, and the one-way clutch The inner edge of the one-way clutch 131 is provided with a connecting portion 1312 corresponding to the transmission portion 1322, so that they can be connected to each other and rotate synchronously; and the one-way clutch 131 can slide along the axial direction of the gear plate 132. The one-way clutch 131 is provided with a plurality of clutch teeth 1311, and the clutch teeth 1311 have a slope tooth surface and are annularly arrayed on the side edge of the one-way clutch 131. In the human-driven rotation direction of the vehicle, when the gear plate 132 rotates faster than the claw plate 133, the one-way clutch 131 rotates faster than the claw plate 133. When the speed is faster, the clutch tooth 1311 of the one-way clutch 131 and the clutch ratchet 1331 of the claw plate 133 are engaged with each other through the transmission part 1322 of the gear plate 132, so as to transmit the driving force to the claw plate 133. On the contrary, when the speed of the claw plate 133 is faster than that of the gear plate 132, the clutch ratchet 1331 of the claw plate 133 and the clutch tooth 1311 of the one-way clutch 131 are in contact with each other at an inclined tooth surface, so as to generate an axial force, which can drive the one-way clutch The clutch 131 pushes the claw plate 133 away. At this time, the driving force of the claw plate 133 will not be transmitted to the gear plate 132 through the one-way clutch 131. An elastic component 134 is provided between the gear plate 132 and the one-way clutch 131. The elastic component 134 provides a pre-stressed elastic force so that the one-way clutch 131 can remain connected and engaged with the claw plate 133 when no axial force is applied to the one-way clutch 131. However, the configuration is only an example and is not intended to be limiting.

Please refer to Figures 9 to 12. In a specific embodiment, the invention is integrated, and the output unit 2 and the hub motor 3 are integrated into the same device. The flywheel gear set 21 is fixed to one side of the freewheel base 22 and rotates synchronously. The connecting member 23 is provided between the freewheel base 22 and the hub 24. In this embodiment, the connecting member 23 is configured as a one-way transmission. The SU configuration can prevent the vehicle from generating counter electromotive force when sliding and reduce the kinetic energy loss during sliding. The tower base 22 is provided with a plurality of ratchet grooves 221 and a groove 222, and a plurality of ratchet grooves 2311 and an elastic unit 2313 are provided correspondingly. The elastic unit 2313 makes the ratchet grooves 2311 normally open and correspondingly engages. A ratchet 2312 is arranged on the connecting member 23, and the ring gear 334 of the deceleration unit 33 is arranged on the other side of the freewheel base 22. As mentioned above, the deceleration can be transmitted to the freewheel base 22 through the rotor 32 to achieve the deceleration effect; and the stator 31 of the hub motor 3 is fixed to the axle 25 by a fixing member 36 so that it cannot rotate, and the sensing device 3 is arranged 4. The sensing device 34 may also be a speed sensing element or a torque sensing element based on magnetism or optics. In the present embodiment, it is configured as a magnetic sensing method. For example, a plurality of magnetic components 35 are provided on the adjacent hub 24. The sensing device 34 can detect the sensing frequency to obtain the rotation speed of the hub 24. However, this is only an example and is not intended to be limiting.

When the connecting component 23 is configured as a SC configuration of a two-way transmission component, as shown in Figure 13, the freehub 22 is bidirectionally synchronously connected to the hub 24 through the connecting component 23. In one embodiment, the freehub 22 can be configured with a plurality of conductive elements 223, and the connecting component 23 is provided with a conductive component 232 corresponding to the conductive element 223, so that they can perform mutual bidirectional transmission; therefore, when the driving force of electricity or the inertial force causes the vehicle to move forward, the hub 24 is rotated by the friction force of the tire, and the freehub 22 and the flywheel gear set 21 can be rotated synchronously through the connecting component 23, and the large plate gear set 14 can be driven to rotate by the transmission unit 6, so that the gear change device 5 can change gears at any time.

In summary, the technical means disclosed in this invention are not only unprecedented, but can also achieve the expected purpose and effect. Therefore, they are both novel and progressive, and are truly new as defined by the Patent Law. In terms of their overall structure, they have indeed met the statutory requirements of the Patent Law, and therefore a new patent application is filed in accordance with the law.

However, what is described above is only the best embodiment of this creation, and it cannot be used to limit the scope of implementation of this creation. In other words, all equivalent changes and modifications made according to the scope of the patent application of this creation and the content of the specification should still fall within the scope of the patent of this creation.

1: Input unit 11: Crank 12: Bottom shaft 121: Gear 122: Sensor 13: Gear pawl 131: One-way clutch 1311: Clutch tooth 1312: Assembly 132: Gear plate 1321: Spline 1322: Transmission 133: Claw plate 1331: Clutch ratchet 134: Elastic component 14: Plate gear set 141: Gear plate 2: Output unit 21: Cassette gear set 211: Gear 22: Freewheel body 221: Pawl groove 222: Groove 223: Guide element 23: Connecting parts 231: One-way clutch 2311: Pawl 2312: Ratchet 2313: Elastic unit 232: Guide parts 24: Hub 25: Axle 3: Hub motor 31: Stator 32: Rotor 33: Speed reduction unit 331: Sun gear 332: Planetary gear 333: Planetary carrier 334: Ring gear 34: Sensor device 35: Magnetic part 36: Fixing part 4: Controller 5: Speed change device 6: Transmission unit 7: Bicycle 71: Front wheel 72: Rear wheel 73: Frame

Figure 1 is a power flow and system block diagram of the present invention. Figure 2 is a side view of the present invention configured on an electric assist bicycle. Figure 3 is a schematic diagram of the transmission mechanism of the present invention. Figure 4 is a shifting flowchart of the connecting component of the present invention configured as a one-way transmission component. Figure 5 is a shifting flowchart of the connecting component configured as a two-way transmission component in another embodiment of the present invention. Figure 6 is a three-dimensional exploded schematic diagram of the input unit of the present invention. Figure 7 is a three-dimensional exploded schematic diagram of the gear claw of the present invention. Figure 8 is a cross-sectional schematic diagram of the input unit of the present invention. Figure 9 is a three-dimensional exploded schematic diagram of the output unit and the wheel motor of the present invention. Figure 10 is a cross-sectional schematic diagram of the output unit and the wheel motor of the present invention. Figure 11 is a cross-sectional view of Figure 10 at the B-B position and a schematic diagram of the output unit and the wheel hub motor. Figure 12 is a cross-sectional view of Figure 10 at the C-C position and a schematic diagram of the output unit and the connecting component being a one-way transmission component. Figure 13 is a cross-sectional view of Figure 10 at the D-D position and a schematic diagram of the output unit and the connecting component being a two-way transmission component in another embodiment of the present invention.

1: Input unit

11: Crank

12: Middle axis

122:Sensor

13: Claws

131: One-way clutch

14: Large plate gear set

2: Output unit

21: Flywheel gear set

22: Tower base

23: Connecting parts

24:Hub

3: Wheel motor

34:Sensor device

4: Controller

5: Speed change device

6: Transmission unit

Claims (10)

An electronic transmission system for an electric assisted bicycle comprises: an input unit having a crank, a middle shaft, a one-way clutch and a large plate gear set; the crank is arranged at both ends of the middle shaft, and the middle shaft is unidirectionally transmitted to the large plate gear set through the one-way clutch; the middle shaft is provided with a sensor, and the sensor is used to detect the rotation speed of the middle shaft; An output unit, which is provided with a flywheel gear set, a freehub, a connecting component and a hub, the large plate gear set is connected to the flywheel gear set by a transmission unit for corresponding transmission, and the transmission unit forms a plurality of gears between the large plate gear set and the flywheel gear set; and the freehub is correspondingly configured with the flywheel gear set; one side of the freehub is connected to the hub through the connecting component; A hub motor, which is correspondingly driven on the hub, and the hub motor is provided with a sensing device for correspondingly detecting its transmission speed; A speed change device, which is correspondingly connected and controls the gear of the transmission unit; and A controller, whose signal is connected to the sensor, the sensing device, the wheel motor and the transmission device; used to adjust the gear of the transmission unit through the transmission device according to the sensing information of the sensor and the sensing device. The electronic transmission system of an electric power-assisted bicycle as described in claim 1, wherein the connecting component is a two-way transmission component or a one-way transmission component; and when the connecting component is a two-way transmission component, the controller detects the transmission speed of the hub motor according to the sensing device, and when the transmission speed increases, the gear is correspondingly increased, and when the transmission speed decreases, the gear is correspondingly decreased; and when the connecting component is a one-way transmission component, the freehub is unidirectionally transmitted to the hub through the connecting component, and the controller detects the rotation of the middle shaft according to the sensor. The gear ratio of the large plate gear set and the flywheel gear set under the gear position is determined according to the gear ratio, and when the speed of the middle shaft converted by the gear ratio is lower than the transmission speed of the wheel hub motor detected by the sensing device, the wheel hub motor is driven accordingly, and when the transmission speed increases, the gear position is increased accordingly, and when the transmission speed decreases, the gear position is decreased accordingly; and when the speed of the middle shaft converted by the gear ratio is equal to the transmission speed, the gear position is directly increased when the transmission speed increases, and when the transmission speed decreases, the gear position is decreased accordingly. As described in claim 2, the electronic transmission system of an electric power-assisted bicycle, wherein, when the connecting component is a one-way transmission component, a rotor is provided in the wheel hub motor, the rotor is transmission-connected to a reduction unit, and the reduction unit is transmission-connected to the tower base corresponding to the reduction at one end of the rotor. The electronic transmission system of the electric power-assisted bicycle as described in claim 1, wherein the input unit further includes a tooth claw, which is provided with a tooth plate, a claw plate and the one-way clutch, the tooth plate is connected to the middle shaft corresponding to the synchronous transmission, and the claw plate is coaxially arranged with the tooth plate and connected to the large plate gear set corresponding to the synchronous transmission, and the one-way clutch is arranged between the tooth plate and the claw plate to allow the tooth plate to transmit unidirectionally to the claw plate. An electronic transmission system for an electric power-assisted bicycle as described in any one of claims 1 to 4, wherein the one-way clutch is a gear-type disc clutch, a pawl clutch, a roller clutch or an actuator clutch. An electronic transmission system for an electric power-assisted bicycle as described in any one of claims 1 to 4, wherein the hub motor is disposed at at least one of the front wheel or the rear wheel of a bicycle; and when the hub motor is disposed at the front wheel of the bicycle, the connecting component is a two-way transmission component. An electronic transmission system for an electric power-assisted bicycle as described in any one of claims 1 to 4, wherein the large plate gear set has a plurality of gears, and the flywheel gear set has a plurality of gears, the numbers of teeth of the gears and the gears are arranged differently, and the transmission unit is connected to different gears or gears to form corresponding different gear positions. An electronic transmission system for an electric power-assisted bicycle as described in any one of claims 1 to 4, wherein the transmission device is an external transmission and is at least one of a front transmission or a rear transmission. An electronic speed change system for an electric assisted bicycle as described in any one of claims 1 to 4, wherein at least one of the sensor and the sensing device is a speed sensing element or a torque sensing element based on magnetism or optics. An electronic speed-changing system for an electric power-assisted bicycle as described in any one of claims 1 to 4, wherein the controller is connected to the sensor, the sensing device, the wheel motor and the speed-changing device by signals in a wired or wireless manner.

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