CN207072421U - gear bike - Google Patents

Abstract

The utility model discloses a variable speed bicycle, which comprises a flywheel, a wheel axle, a chain, a pressure sensor for detecting the treading pressure of the bicycle, a controller and a variable speed executing component; the flywheel is arranged on the wheel shaft, a transmission assembly for driving the wheel shaft to rotate is arranged between the flywheel and the wheel shaft, at least two wheel discs with different sizes are further arranged on the flywheel, and chain teeth meshed with the chain are arranged on the wheel discs; the pressure sensor is arranged in the transmission assembly, and the pressure sensor and the variable speed execution component are respectively connected with the controller; the controller sends a speed change instruction to the speed change execution part when the pressure data detected by the pressure sensor meets the speed change condition, the speed change bicycle of the utility model can accurately detect the treading pressure and automatically change speed according to the treading pressure; the pressure sensors and the like are installed at the flywheel in a centralized mode, the integration level of parts is high, and the installation is simple and convenient.

Description

gear bike

technical field

The utility model belongs to the field of mechanical equipment, in particular to a variable speed bicycle.

Background technique

A bicycle, also known as a bicycle or bicycle, is usually a small land vehicle with two wheels. After a person rides on the car, it is powered by pedals, which is a green and environmentally friendly means of transportation. It can be used as an environmentally friendly means of transportation for transportation and travel; more and more people use bicycles as fitness equipment for cycling exercise and bicycle travel; bicycle itself is also a competitive sport, including road cycling, mountain biking, Track cycling, stunt bike racing, etc.

Along with the enhancement of people's environmental protection and fitness consciousness, more and more people like to ride a bicycle, especially the bicycle with variable speed function. For bicycles with speed change function at the present stage, the rider mainly adjusts the transmission manually according to his own physical strength and riding experience when riding, and selects a suitable flywheel sprocket to achieve a better riding effect. But this kind of bicycle by manually adjusting the transmission, on the one hand, cannot automatically adjust the transmission according to the rider's own physical condition and riding experience, which is not smart enough; on the other hand, manually adjusting the transmission when riding will distract the rider. Affect riding safety.

In short, the variable-speed bicycles at the present stage have the technical problem that the speed changer cannot be automatically adjusted, which affects riding safety.

Utility model content

In view of this, the embodiment of the present utility model provides a variable-speed bicycle, which is used to solve the technical problem that the current variable-speed bicycle cannot automatically adjust the transmission, which affects riding safety.

The embodiment of the utility model provides a variable-speed bicycle, which includes: a flywheel, a wheel shaft, a chain, a pressure sensor for detecting the pedaling pressure of the bicycle, a controller, and a variable-speed actuator; wherein,

The flywheel is installed on the wheel shaft, and a transmission assembly for driving the wheel shaft to rotate is provided between the flywheel and the wheel shaft, and at least two wheel discs of different sizes are also provided on the flywheel , and the wheel disc is provided with sprocket meshing with the chain;

The pressure sensor is installed in the transmission assembly, and the pressure sensor and the shift execution component are respectively connected to the controller;

The chain is linked with the execution action output end of the speed change execution part;

When the pressure data detected by the pressure sensor satisfies the shifting condition, the controller sends a shifting command to the shifting execution part; the shifting execution part outputs corresponding execution actions according to the shifting command to drive the chain Switching between the at least two roulettes of unequal size.

Further, the transmission assembly includes a ratchet and a pawl;

The ratchet is arranged on the inside of the wheel of the flywheel, and there are a plurality of ratchet grooves arranged in the ratchet, and at least one ratchet matching with the ratchet groove is provided on the wheel shaft, and the ratchet is far away from The end of the wheel shaft is inserted into the ratchet groove, so that when the ratchet integrated with the flywheel rotates, the wheel shaft connected to the pawl is driven to rotate;

The pressure sensor is arranged at a position where the pawl and the ratchet groove are in contact with each other.

Further, the pressure sensor is arranged at an end of each pawl that is relatively far away from the wheel axle.

Further, the pressure sensor is arranged in each of the ratchet grooves.

Further, the variable speed bicycle further includes: a first tachometer for detecting the rotational speed of the wheel shaft and a second tachometer for detecting the rotational speed of the flywheel;

The first tachometer and the second tachometer are installed on the wheel shaft and the flywheel respectively, and are respectively connected with the controller, so that the controller can Data, the first rotational speed detected by the first tachometer, and the second rotational speed detected by the second tachometer are used to determine whether the shift condition is satisfied.

Further, the speed change execution component includes: a rotating motor and an actuator; the rotating motor is connected to the controller to output clockwise or counterclockwise rotating power according to the control instruction sent by the controller;

The actuator is connected to the rotating motor and linked with the chain to convert the rotating power output by the rotating motor into a driving force driving the chain to move on the at least two wheel discs of different sizes , so as to drive the chain to switch between the at least two wheel discs of different sizes.

Further, the pressure sensor includes any one of strain gauge pressure sensor, ceramic pressure sensor, diffused silicon pressure sensor, sapphire pressure sensor and piezoelectric pressure sensor.

Further, the controller is arranged in the seat stay, chain stay or standpipe of the bicycle.

Further, the actuator includes a transmission line and a guide wheel;

The first end of the transmission line is connected to the output end of the rotating electrical machine, and the second end of the transmission line is connected to the guide wheel;

There are a plurality of sprockets on the guide wheel, which are meshed with the chain;

Driven by the rotation of the rotating motor, the length of the shifting cable changes, and drives the direction of the guide wheel to change, so that the guide wheel drives the chain between the at least two wheels of different sizes. Switch between;

The variable speed bicycle also includes:

The manual governor for adjusting the length of the speed change line is arranged on the handlebar of the bicycle and connected with the first end of the speed change line.

Further, the variable speed bicycle also includes:

The wireless transmission module is connected with the controller and the mobile terminal, and the pressure data detected by the pressure sensor acquired by the controller, the first rotational speed detected by the first tachometer, the second tachometer detected The information of the second rotating speed and the wheel engaged by the chain is sent to the mobile terminal.

The variable speed bicycle provided by the embodiment of the utility model, by adding a pressure sensor in the transmission assembly between the flywheel and the wheel shaft, detects the pedaling pressure of the rider, and when the detected pressure data satisfies the speed change condition, it sends The speed change command, the speed change execution part outputs the corresponding execution action according to the speed change command, so as to drive the chain to switch between at least two wheel discs of different sizes. On the one hand, it can accurately detect the pedaling pressure of the bicycle and realize automatic speed change according to the pedaling pressure ; On the other hand, components such as pressure sensors are concentratedly installed at the flywheel of the bicycle, and the components are highly integrated and easy to install.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the appended drawings in the following description The drawings show some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creative work.

Fig. 1 is the schematic structural view of the flywheel of the variable-speed bicycle provided by the embodiment of the present invention;

Fig. 2 is a connection diagram of part of the hardware structure of the variable speed bicycle provided by the embodiment of the present invention.

Detailed ways

The implementation of the utility model will be described in detail below in conjunction with the accompanying drawings and examples, so that the implementation process of how the utility model uses technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

Certain terms are used, for example, in the description and claims to refer to particular components. Those skilled in the art should understand that hardware manufacturers may use different terms to refer to the same component. The specification and claims do not use the difference in name as a way to distinguish components, but use the difference in function of components as a criterion for distinguishing. As mentioned throughout the specification and claims, "comprising" is an open term, so it should be interpreted as "including but not limited to". "Approximately" means that within an acceptable error range, those skilled in the art can solve the technical problem within a certain error range and basically achieve the technical effect. In addition, the term "coupled" or "electrically connected" herein includes any direct and indirect electrical coupling means. Therefore, if it is described that a first device is coupled to a second device, it means that the first device may be directly electrically coupled to the second device, or indirectly electrically coupled through other devices or coupling means. connected to the second device. The following descriptions in the specification are preferred implementation modes for implementing the present utility model, but the description is for the purpose of illustrating the general principles of the present utility model, and is not intended to limit the scope of the present utility model. The scope of protection of the present utility model should be defined by the appended claims.

It should also be noted that the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, commodity, or system comprising a set of elements includes not only those elements, but also includes Other elements not expressly listed, or elements inherent in such process, method, commodity, or system are also included. Without further limitations, an element defined by the phrase "comprising a ..." does not preclude the presence of additional identical elements in the process, method, commodity or system comprising said element.

Please refer to the following drawings, Fig. 1 is a schematic structural view of the flywheel of the variable speed bicycle provided by the embodiment of the utility model; Fig. 2 is a part of the hardware structure connection diagram of the variable speed bicycle provided by the embodiment of the utility model.

As shown in Figure 1, the variable-speed bicycle provided by the embodiment of the utility model includes a flywheel 10, a chain 20, a pressure sensor 30 for detecting the pedaling pressure of the bicycle, a wheel shaft 40, a controller (not shown) and a speed changer. Executing components (not shown in the figure).

Please refer to FIG. 2 , which is a part of the hardware structure connection diagram of the speed-changing bicycle provided by the embodiment of the present invention. The flywheel 10 is installed on the wheel shaft 40. Generally, the flywheel 10 is a ring-shaped structure sleeved on the On the wheel axle 40 , at least two wheel discs 110 of different sizes are arranged on the outer side of the flywheel 10 . Here, a plurality of wheel discs 110 of different sizes are arranged on the outer side of the flywheel 10 . , the flywheel of a more common variable-speed bicycle has 6 or 8 circular discs 110 of different sizes. The different sizes here mean that the diameters of the discs 110 are different, but each of the discs 110 The center of the circle is located on the same straight line; and a plurality of chain teeth 120 meshing with the chain 20 are provided on the wheel disc 110; here, the number of the chain teeth 120 is the same as the diameter of the wheel disc 110 Relatedly, the larger the diameter of the wheel disc 110 is, the greater the number of the chain teeth 120 is.

The chain 20 meshes with the sprockets on one of the at least two wheel discs 110 of different sizes. One of the roulette sprockets in the roulettes 110 of different sizes meshes, which is referred to as the first roulette here.

A transmission assembly 130 is also provided between the flywheel 10 and the wheel shaft 40, and here, the transmission assembly 130 is generally installed inside the flywheel 10 and contacts with the wheel shaft 40 for driving the wheel shaft 40. The wheel axle 40 rotates. Specifically, the movement of the chain 20 can drive the wheel 110 to rotate, and then drive the flywheel 10 to rotate, and the transmission assembly 130 also rotates with the flywheel 10, thereby driving the The wheel axle 40 rotates.

The pressure sensor 30 is installed in the transmission assembly 130, and is used to detect the force that the transmission assembly 130 drives the wheel shaft 40 to move, and this force is the same as the rider's pedaling pressure; Installed on the bicycle frame close to the flywheel 10, such as being arranged on the seat stay, chain stay or standpipe of the bicycle near the position of the flywheel 10; the pressure sensor 30, the controller and the speed change The execution components are connected in sequence, that is, the controller is respectively connected to the pressure sensor 30 and the shift execution components, and the connection here refers to electrical connection, which can be connected through a physical cable. The speed change execution part is in contact with the chain 20, and the speed change execution part can act on the chain 20, that is, the chain 20 is linked with the execution action output end of the speed change execution part.

When the pressure data detected by the pressure sensor 30 satisfies the shift condition, the controller sends a shift instruction to the shift execution component. Here, the pressure sensor 30 is used to detect the pedaling pressure F of the rider in real time, and transmit the pressure data F to the controller, and a first pressure threshold F1 is set on the controller, if the detected pressure data F is greater than the first pressure threshold F1, it indicates If the rider exerts a lot of effort, that is, it is relatively laborious, it is deemed to meet the shifting condition. At this time, a shifting command is sent to the shifting actuator. The specific shifting command is to switch the chain 20 to engage with the larger wheel disc 110. sprockets: after receiving the shifting command, the shifting execution part outputs corresponding execution actions according to the shifting command, and the execution action here refers to switching the sprockets of the chain 20 meshing with the larger wheel disc 110 Action, that is, to drive the chain 20 to switch between the at least two roulettes of different sizes, specifically, to move from the original first roulette to the at least two roulettes of different sizes The second wheel, the diameter of the second wheel here is greater than the diameter of the first wheel, the chain 20 after moving to the second wheel, automatically with the second wheel The sprockets on the sprocket mesh.

Here, it should be pointed out that after the chain 20 meshes with the sprocket on the second wheel, the pressure sensor 30 continues to monitor the pedaling pressure F of the rider, when the pressure F continues to be greater than the specified When the above-mentioned first pressure threshold F1 is reached, it indicates that the strength used by the rider is still relatively large, that is, it is still relatively laborious, and it is considered that the shifting condition is still met. The speed change execution part drives the chain 20 to move to a wheel with a larger diameter, and meshes with the sprockets, and repeats this until the pedaling pressure F of the rider detected by the pressure sensor 30 is less than the first until the pressure threshold F1.

In this embodiment, a pressure sensor is added at the contact between the flywheel and the wheel shaft to detect the pedaling pressure of the cyclist, and when the detected pressure data meets the shifting conditions, a shifting instruction is sent to the shifting execution part for the execution of the shifting The components output corresponding execution actions according to the speed change command to drive the chain to switch between at least two wheel discs of different sizes. On the one hand, it can accurately detect the pedaling pressure of the cyclist and realize automatic speed change according to the pedaling pressure. Manually controlling the transmission of the bicycle makes the speed change more accurate and timely, and at the same time avoids affecting the rider's attention due to manual speed change, and improves riding safety; The components are highly integrated and easy to install.

In other preferred embodiments of the present utility model, the transmission assembly 130 includes a ratchet 1301 and a pawl 1302;

The ratchet 1301 is arranged inside the wheel of the flywheel 10, and there are a plurality of ratchet grooves 1303 arranged in the ratchet 1301, and at least one ratchet pawl matching the ratchet groove 1303 is provided on the wheel axle 40. 1302, the end of the pawl 1302 away from the wheel shaft 40 is inserted into the ratchet groove 1303, so that when the ratchet 1301 integral with the flywheel 10 rotates, the ratchet 1302 connected to the flywheel 10 is driven. The wheel axle 40 rotates.

Specifically, the wheel shaft 40 is rigidly connected to the wheel, the rotation of the wheel shaft 40 drives the rotation of the wheel, and at least one pawl 1302 is provided on the surface of the wheel shaft 40, usually to ensure that the The pawl 1302 has a good degree of engagement with the ratchet 1301, and generally two pawls 1302 are provided. Generally, the two pawls 1302 are respectively located at both ends of the same diameter of the wheel shaft 40. The pawls One end of the pawl 1302 is connected to the surface of the wheel shaft 40, and a spring is installed between the other end and the wheel shaft 40, and when the pawl 1302 is under pressure, the pawl 1302 will stick to the surface of the vehicle. On the axle 40; when the pawl 1302 is not under pressure, the spring will spring up, and the pawl 1302 will protrude. The ratchet 1301 is arranged on the inner side of the flywheel 10 and rotates synchronously with the integral structure of the flywheel 10, that is, the ratchet 120 can be driven by the chain 20 to move smoothly around the wheel shaft 40. , Rotate in two directions counterclockwise. When the flywheel 10 rotates counterclockwise, the ratchet 1301 also rotates counterclockwise. At this time, the ratchet groove 1403 on the ratchet 1301 will catch the raised pawl 1302, that is, the pawl 1302 is far away from the wheel shaft 40 end of the ratchet groove 1403, so that the ratchet 1302 rotates, and then the ratchet 1302 drives the wheel shaft 40 to rotate, that is, when the ratchet 1301 integral with the flywheel 10 rotates, it drives When the wheel shaft 40 connected to the pawl 1302 rotates, the flywheel 10 and the wheel shaft 40 rotate synchronously; when the flywheel 10 rotates clockwise, the ratchet 1301 also rotates clockwise , at this time, the ratchet 1301 pushes down the pawl 1302, and the pawl 1302 will be attached to the surface of the wheel axle 40, and the pawl 1302 does not hang on the ratchet groove 1403. At this time, the The wheel shaft 40 is not stressed, that is, the pawl 1302 will not drive the wheel shaft 40 to rotate, the rotation of the flywheel 10 will not affect the rotation of the wheel shaft 40, and the flywheel 10 and the wheel shaft 40 will not be affected. The wheel axles 40 rotate asynchronously.

The pressure sensor 30 is arranged at the position where the pawl 1302 and the ratchet groove 1403 are in contact with each other. When the pawl 1302 and the ratchet wheel 1301 are in contact with each other, it can detect the mutual pressing pressure of the two, namely The rider's pedaling pressure F; specifically, in one case, the pressure sensor 30 is arranged at the end of each of the pawls 1302 that is relatively far away from the wheel shaft 40, so that when the pawls 1302 sink into the pawls In the groove 1403, the force against the ratchet 1301 is detected by the pressure sensor 30; in another case, the pressure sensor 30 is arranged in the ratchet groove 1403, because there are multiple ratchet grooves 1403, so Considering the economic cost in practice, the pressure sensors 30 are generally arranged at intervals, and generally the pressure sensors 30 are arranged in the three ratchet grooves 1403 of the ratchet 1301, so that when the ratchet 1302 sinks into the ratchet In the groove 1403 , the force of the ratchet 1301 against the ratchet groove 1403 is detected by the pressure sensor 30 .

Here, the pressure sensor 30 includes any one of strain gauge pressure sensors, ceramic pressure sensors, diffused silicon pressure sensors, sapphire pressure sensors and piezoelectric pressure sensors. In practical applications, the corresponding type of pressure sensor can be selected according to the actual situation.

In other preferred embodiments of the present utility model, the variable-speed bicycle further includes a first tachometer 50 and a second tachometer 60, the first tachometer 50 is used to detect the rotation speed of the wheel shaft 40, and the second tachometer The second tachometer 60 is used to detect the rotation speed of the flywheel 10 .

Specifically, the first tachometer 50 and the second tachometer 60 are mounted on the wheel axle 40 and the flywheel 10 respectively, and the first tachometer 50 and the second tachometer 60 are respectively It is connected with the controller, and is used to transmit the rotation speed data of the wheel shaft 40 and the rotation speed data of the flywheel 10 to the controller.

According to the received pressure data detected by the pressure sensor, the first rotational speed detected by the first tachometer 50 and the second rotational speed detected by the second tachometer 60 , the controller determines whether the required The above-mentioned shifting conditions. As mentioned above, when the pedaling pressure F of the rider is greater than the first pressure threshold F1, the speed change condition is met, and at this time, the chain 20 is switched to the large wheel 110;

A second pressure threshold F2 is also set, wherein F1 is greater than F2. When the pedaling pressure F of the cyclist is between F2 and F1, it indicates that the cyclist is exerting moderate force at this time, and there is no need to change gear at this time, that is, maintain The original roulette 110 remains unchanged, that is, it does not meet the shifting conditions at this time;

When the pedaling pressure F is less than F2, the rider exerts less force, that is, the rider does not exert any effort. If the first rotational speed of the wheel shaft 40 detected by the first tachometer 50 is equal to the second When the second rotating speed of the flywheel 10 detected by the meter 60 is the same, since the rider does not make any effort at this time, the speed change condition is not met at this time; if the wheel shaft detected by the first tachometer 50 When the first rotation speed of 40 is greater than the second rotation speed of the flywheel 10 detected by the second tachometer 60, although the rider does not exert much effort at this time, the rotation speed of the wheel is greater than the speed of the flywheel, that is, the rider At this time, it is for nothing, and the power of the pedals is not converted into the power of the bicycle to move forward. Therefore, it is necessary to switch to the small wheel 110 to increase the speed of the flywheel 10, and then the power of the rider's pedals can be effectively It is transformed into the power for the bicycle to move forward, that is, the speed change condition is met at this time. At this time, the controller sends a speed change command to the speed change execution component, and the speed change command at this time is to switch to the small wheel;

After switching to the small wheel disc, the first tachometer 50 and the second tachometer 60 continue to detect the rotation speeds of the wheel shaft 40 and the flywheel 10, if the first tachometer 50 detects the When the first rotation speed of the wheel shaft 40 continues to be greater than the second rotation speed of the flywheel 10 detected by the second tachometer 60, the controller continues to send a shift instruction to the shift execution component, and the shift at this time The instruction is to continue switching to smaller wheels until the first rotational speed of the wheel shaft 40 detected by the first tachometer 50 continues to equal the second rotational speed of the flywheel 10 detected by the second tachometer 60 So far, here, it should be pointed out that, when the bicycle is running normally, the rotation speed of the flywheel 10 is less than or equal to the rotation speed of the wheel shaft 40 .

In one embodiment of the present utility model, the speed change execution component includes a rotating motor and an execution mechanism. Wherein, the rotating motor is connected with the controller to output clockwise or counterclockwise rotating power according to the control command sent by the controller, that is, the rotating motor executes the The control command is to rotate clockwise or counterclockwise. The control command should also include the rotation range of the rotating motor, such as the number of rotations of the rotating motor. The rotation of the rotating motor is to output the corresponding rotating power.

The actuator is connected to the rotating motor and is linked with the chain 20 to convert the rotating power output by the rotating motor into motion that drives the chain 20 to move on the at least two wheel discs of different sizes. The driving force is to drive the chain 20 to switch between the at least two wheels of different sizes, specifically, to drive the chain 20 to move from the first wheel to the second wheel as described above. and meshes with the sprockets on the second wheel.

Specifically, the actuator includes a speed change wire and a guide wheel, wherein the first end of the speed change wire is connected to the output end of the rotating electrical machine, such as the first end of the speed changing wire is wound around the output end of the rotating electrical machine On the shaft head, that is, the rotation of the rotating motor can change the effective length of the transmission line, and the second end of the transmission line is connected to the guide wheel; there are multiple sprockets on the guide wheel, and are connected with The chain 20 is meshed. Here, the guide wheel is generally arranged under the wheel, and the length of the speed change line changes under the rotation of the rotating motor, and drives the direction of the guide wheel. Changes occur, so that the guide wheel drives the chain 20 to move from the first wheel to the second wheel and engage with the sprockets on the second wheel.

In other preferred embodiments of the present utility model, in order to avoid failure of the automatic transmission mechanism of the speed-changing bicycle, a manual speed governor can also be selectively added, and the manual speed governor can be arranged on the bicycle handlebar, and The first end of the transmission line is connected to adjust the length of the transmission line. As mentioned above, the second end of the shift cable is connected to the guide wheel; there are a plurality of sprockets on the guide wheel, and meshed with the chain 20, where the guide wheel is generally arranged on Below the roulette, the length of the speed change wire changes under the adjustment of the manual speed governor, and drives the direction of the guide wheel to change, so that the guide wheel drives the chain 20 from the first A wheel moves to the second wheel and meshes with the sprocket on the second wheel.

Further, the controller is arranged in the seat stay, chain stay or standpipe of the bicycle, where the controller is to communicate with the pressure sensor 30, the first tachometer 50, the second speed Meter 60 and the rotating motor are electrically connected. In order to improve the overall feeling of the bicycle and save materials, the controller is generally arranged near the rear wheel of the bicycle. The lower fork or the standpipe, but this does not constitute a limitation to the present invention, and it can also be arranged at other positions of the bicycle to achieve the same function.

As mentioned above, by adding the first tachometer and the second tachometer, respectively detect the rotation speed of the bicycle wheel shaft and the rotation speed of the flywheel, and transmit the relevant rotation speed data to the controller. When the rotation speed of the bicycle wheel shaft is greater than the rotation speed of the flywheel, the The speed change actuator sends a speed change command to make the chain mesh with the small wheel, so as to increase the speed of the flywheel, avoid the waste of energy for the rider, and improve the user experience; When the speed change mechanism fails, the rider can also use the manual speed governor to change speed, further improving the user experience.

In addition, in other preferred embodiments of the present invention, a wireless transmission module (not shown in the figure) can also be selectively added, and the wireless transmission module is connected with the controller and the mobile terminal, where the mobile The terminal includes but is not limited to a smart phone, a tablet computer, etc., and the wireless transmission module is used to transmit the pressure data detected by the pressure sensor acquired by the controller, the first rotational speed detected by the first tachometer 50 , the second rotational speed detected by the second tachometer 60 and the information of the wheel 110 engaged by the chain 20 are sent to the mobile terminal. After the mobile terminal acquires these data, on the one hand, the user can issue a control command to the controller according to the relevant data, so that the controller can issue a corresponding shift command according to the control command, so that the shift execution component can After receiving the speed change command, output the corresponding execution action according to the speed change command to drive the chain 20 to switch between the at least two roulettes of different sizes, that is, realize the speed change through the mobile terminal On the other hand, the user can also input the parameters of the controller through the mobile terminal according to his actual situation, such as the first pressure threshold F1, the second pressure threshold F2, etc. described above, to realize the control of the controller. Parameter setting improves the interactive experience between the variable speed bicycle and the smart terminal, making the variable speed bicycle more intelligent and further improving the user experience.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present utility model, and are not intended to limit it; although the utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: It is still possible to modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit of the technical solutions of the various embodiments of the present invention. and range.

Claims (10)

1. A speed-changing bicycle, characterized in that it comprises: a flywheel, a wheel shaft, a chain, a pressure sensor for detecting the pedaling pressure of the bicycle, a controller and a speed-changing executive component; wherein, The flywheel is installed on the wheel shaft, and a transmission assembly for driving the wheel shaft to rotate is provided between the flywheel and the wheel shaft, and at least two wheel discs of different sizes are also provided on the flywheel , and the wheel disc is provided with sprocket meshing with the chain; The pressure sensor is installed in the transmission assembly, and the pressure sensor and the shift execution component are respectively connected to the controller; The chain is linked with the execution action output end of the speed change execution part; When the pressure data detected by the pressure sensor satisfies the shifting condition, the controller sends a shifting command to the shifting execution part; the shifting execution part outputs corresponding execution actions according to the shifting command to drive the chain Switching between the at least two roulettes of unequal size. 2. The variable speed bicycle according to claim 1, wherein the transmission assembly comprises a ratchet and a pawl; The ratchet is arranged on the inside of the wheel of the flywheel, and there are a plurality of ratchet grooves arranged in the ratchet, and at least one ratchet matching with the ratchet groove is provided on the wheel shaft, and the ratchet is far away from The end of the wheel shaft is inserted into the ratchet groove, so that when the ratchet integrated with the flywheel rotates, the wheel shaft connected to the pawl is driven to rotate; The pressure sensor is arranged at a position where the pawl and the ratchet groove are in contact with each other. 3 . The bicycle with variable speed according to claim 2 , wherein the pressure sensor is arranged at an end of each pawl that is relatively far away from the wheel axle. 4 . 4 . The variable speed bicycle according to claim 2 , wherein the pressure sensor is arranged in each of the ratchet grooves. 5. The variable speed bicycle according to claim 2, further comprising: a first tachometer for detecting the rotational speed of the wheel shaft and a second tachometer for detecting the rotational speed of the flywheel; The first tachometer and the second tachometer are installed on the wheel shaft and the flywheel respectively, and are respectively connected with the controller, so that the controller can Data, the first rotational speed detected by the first tachometer, and the second rotational speed detected by the second tachometer are used to determine whether the shift condition is satisfied. 6. The speed-changing bicycle according to any one of claims 1 to 5, characterized in that, the speed-changing execution part comprises: a rotating motor and an actuator; the rotating motor is connected with the controller, so as to The control command sent by the controller outputs clockwise or counterclockwise rotation power; The actuator is connected to the rotating motor and linked with the chain to convert the rotating power output by the rotating motor into a driving force driving the chain to move on the at least two wheel discs of different sizes , so as to drive the chain to switch between the at least two wheel discs of different sizes. 7. The variable speed bicycle according to any one of claims 1 to 5, characterized in that the pressure sensors include strain gauge pressure sensors, ceramic pressure sensors, diffused silicon pressure sensors, sapphire pressure sensors and piezoelectric pressure sensors any of the. 8. The variable speed bicycle according to any one of claims 1 to 5, characterized in that the controller is arranged in the seat stay, chain stay or seat tube of the bicycle. 9. The speed-changing bicycle according to claim 6, wherein the actuator comprises a speed-changing cable and a guide wheel; The first end of the transmission line is connected to the output end of the rotating electrical machine, and the second end of the transmission line is connected to the guide wheel; There are a plurality of sprockets on the guide wheel, which are meshed with the chain; Driven by the rotation of the rotating motor, the length of the shifting wire changes, and drives the direction of the guide wheel to change, so that the guide wheel drives the chain between the at least two wheels of different sizes. Switch between; The variable speed bicycle also includes: The manual governor for adjusting the length of the speed change line is arranged on the handlebar of the bicycle and connected with the first end of the speed change line. 10. The variable speed bicycle according to claim 5, further comprising: The wireless transmission module is connected with the controller and the mobile terminal, and the pressure data detected by the pressure sensor acquired by the controller, the first rotational speed detected by the first tachometer, the second tachometer detected The information of the second rotating speed and the wheel engaged by the chain is sent to the mobile terminal.