Screw rod type electric control tooth disc moving assembly, bicycle and bicycle gear shifting system

Abstract

The application discloses a screw rod type electric control sprocket moving assembly, a bicycle and a bicycle speed change system. A slidable shaft sleeve is sleeved at a middle shaft, and a sprocket is installed. When the gear position of a freewheel is switched, a control module drives a nut to rotate through an electric control driving part, and then a screw rod matched with the nut moves to drive the shaft sleeve to slide along the middle shaft in the axial direction, so that the sprocket synchronously generates axial displacement, and linkage and adaptation with gear change of the freewheel are completed. The sprocket position can be dynamically adjusted according to the gear position change, the included angle between the chain, the sprocket and the freewheel is effectively reduced, the riding efficiency is improved, the meshing and cutting range of the chain and the tooth part is expanded, the chain falling risk, the asymmetric wear and the axial stress of the tooth part are reduced, the tooth deformation probability is reduced, and the service life of the transmission component is prolonged.

Description

Technical Field

[0001] This application relates to the field of bicycles, and in particular to a lead screw type electronically controlled chainring movement assembly, a bicycle, and a bicycle shifting system. Background Technology

[0002] Currently, shifting gears on multi-speed bicycles primarily relies on manual operation. When encountering changes in gradient or needing to adjust speed, riders must rely on experience to judge when to shift gears, which is particularly difficult for inexperienced beginners. If a beginner makes a mistake, they will experience noticeable jerking during the ride, increasing energy consumption and severely impacting the riding experience. Furthermore, during shifting, some gears may exhibit an excessively large angle between the chainring and chain, reducing riding efficiency and further compromising smoothness and comfort, resulting in a less than ideal riding experience. Utility Model Content

[0003] This application aims to provide a lead screw type electronically controlled chainring movement assembly, a bicycle, and a bicycle shifting system, which can improve the riding efficiency of cyclists.

[0004] According to a first aspect embodiment of this application, a lead screw type electrically controlled crankcase moving assembly includes:

[0005] The center axle is used for rotatable mounting to the chassis;

[0006] A bushing is fitted onto the central shaft and can slide along the axial direction of the central shaft. The bushing and the central shaft are relatively fixed to each other in the circumferential direction of the central shaft.

[0007] The toothed disc is disposed on the bushing;

[0008] A drive mechanism is installed on the outside of the central shaft. The drive mechanism includes a lead screw, a nut, and an electrically controlled drive unit. The lead screw extends along the axial direction of the central shaft and can slide along the axial direction of the central shaft. The bushing and / or the toothed sprocket are rotatably connected to the lead screw. The nut can rotate about its own axis. The nut is threadedly connected to the lead screw. The electrically controlled drive unit is drively connected to the nut.

[0009] The control module is electrically connected to the electronically controlled drive unit and is used to control the operation of the electronically controlled drive unit so as to drive the nut to rotate, thereby causing the lead screw to move, and thus driving the toothed sprocket and / or the bushing to move.

[0010] A bicycle gear shifting system according to a second aspect embodiment of this application includes:

[0011] As in the first aspect embodiment, the lead screw type electrically controlled toothed disc moving assembly;

[0012] The flywheel speed changer is connected to the control module and is used to adjust the flywheel's gear position.

[0013] The bicycle according to a third aspect embodiment of this application includes a lead screw type electronic chainring movement assembly as described in the first aspect embodiment.

[0014] The lead screw type electronically controlled chainring moving assembly, bicycle, and bicycle derailleur system of this application embodiment, by fitting a sliding bushing at the bottom bracket and installing the chainring, enable the control module to drive the nut to rotate through the electronically controlled drive unit when the freewheel is shifting gears. This causes the lead screw, which cooperates with the nut, to move, thereby driving the bushing to slide axially along the bottom bracket. Ultimately, this causes the chainring to synchronously generate axial displacement, thus completing the linkage adaptation with the freewheel shifting. This application embodiment can dynamically adjust the chainring position according to gear changes, effectively reducing the angle between the chain, chainring, and freewheel. This not only improves riding efficiency but also reduces the risk of chain drop, asymmetrical wear of the teeth, and axial stress by expanding the meshing range between the chain and the teeth, lowering the probability of tooth deformation and extending the service life of transmission components. Furthermore, compared to the passive adjustment method of relying on the chain to drive the chainring during traditional freewheel shifting, the active drive structure based on the nut and lead screw design of this application embodiment makes the chainring movement smoother and more precise, significantly reducing jamming.

[0015] Other features and advantages of this application will be set forth in the following description and will be apparent in part from the description or may be learned by practicing the application. Attached Figure Description

[0016] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0017] Figure 1 This is a schematic diagram illustrating the connection between a traditional chainring and a freewheel.

[0018] Figure 2 A schematic diagram illustrating the fit between the chainring and the freewheel in an embodiment of this application;

[0019] Figure 3 An electrical system diagram of the lead screw type electrically controlled crankcase movement assembly provided in the embodiments of this application;

[0020] Figure 4 This is a schematic diagram of the overall structure of the crankset assembly with lead screw provided in an embodiment of this application;

[0021] Figure 5 This is a partial cross-sectional view of a screw-driven crank assembly provided in an embodiment of this application.

[0022] Figure label:

[0023] Central axis 100; Keyway 101;

[0024] Bushing 200; Key structure 201;

[0025] Crankset 300;

[0026] Drive mechanism 400; lead screw 401; nut 402; electric control drive unit 403; drive motor 404; reducer 405; guide groove 406; worm gear 407; fourth bearing 408;

[0027] Assembly base 500; mounting hole 501; anti-rotation part 502;

[0028] First bearing 600;

[0029] Second bearing 700;

[0030] Third bearing 800;

[0031] Frame 900;

[0032] Flywheel 1000;

[0033] Control module 1010; display unit 1020; position detection unit 1030; torque detection unit 1040; cadence detection unit 1050; human-machine interaction unit 1060; lactic acid detection device 1070; heart rate detection device 1080; blood pressure detection device 1090. Detailed Implementation

[0034] The embodiments of this application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0035] In the description of this application, the use of terms such as "first," "second," etc., is for the purpose of distinguishing technical features only and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or the order of the technical features indicated.

[0036] In the description of this application, it should be understood that the orientation descriptions, such as up, down, etc., are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0037] In the description of this application, it should be noted that, unless otherwise explicitly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.

[0038] The technical solution of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are some embodiments of this application, not all embodiments.

[0039] To better describe the lead screw type electronically controlled chainring moving assembly, bicycle, and bicycle shifting system of this application, a brief description is given here of the 300° angle change between the chain and chainring during conventional bicycle gear shifting. (Reference) Figure 1 When the chain is in the highest gear (1000) on the cassette, there is a large angle θ between the chain and the chainring 300. Because of this angle θ, a significant axial component of the chain's driving force cannot be used to drive the cassette 1000, resulting in energy waste. Understandably, the larger the angle θ, the more energy is wasted. This embodiment reduces energy waste by decreasing the angle θ, thereby improving riding efficiency. (Reference) Figure 2 , Figure 2 The dashed rectangle can be understood as the position of the crankset 300 before it moves, and the solid rectangle can be understood as the position of the crankset 300 after it moves. The included angle after the movement is β, which is significantly smaller than the angle θ, thus effectively reducing the axial force component.

[0040] Based on the above scenario, the following describes the lead screw type electronically controlled chainring movement assembly, control method, device, equipment, medium, and bicycle according to embodiments of this application.

[0041] See Figures 3 to 5 As shown, one embodiment of this application provides a lead screw-type electrically controlled crankset movement assembly, which includes:

[0042] The central axle 100 is used for rotatable mounting on the frame 900;

[0043] A bushing 200 is fitted onto a central shaft 100 and can slide along the axial direction of the central shaft 100. The bushing 200 and the central shaft 100 are relatively fixed in the circumferential direction of the central shaft 100.

[0044] The toothed plate 300 is located on the bushing 200;

[0045] The drive mechanism 400 is installed on the outside of the central shaft 100. The drive mechanism 400 includes a lead screw 401, a nut 402 and an electric drive unit 403. The lead screw 401 extends along the axial direction of the central shaft 100 and can slide along the axial direction of the central shaft 100. The bushing 200 and / or the toothed plate 300 are rotatably connected to the lead screw 401. The nut 402 can rotate around its own axis and is threadedly connected to the lead screw 401. The electric drive unit 403 is drively connected to the nut 402.

[0046] The control module 1010 is electrically connected to the electric drive unit 403 and is used to control the operation of the electric drive unit 403 so that the nut 402 is rotated by the electric drive unit 403, causing the lead screw 401 to move, thereby driving the gear sprocket 300 and / or bushing 200 to move.

[0047] In this embodiment, by fitting a sliding bushing 200 onto the bottom bracket 100 and installing a chainring 300, when the freewheel 1000 is shifting gears, the control module 1010 controls the electronically controlled drive unit 403 to drive the nut 402 to rotate. This causes the lead screw 401, which engages with the nut 402, to move, thereby causing the bushing 200 to slide axially along the bottom bracket 100. Ultimately, this causes the chainring 300 to synchronously generate axial displacement, thus achieving linkage adaptation with the freewheel 1000 during gear shifting. This embodiment can dynamically adjust the position of the chainring 300 according to gear changes, effectively reducing the angle between the chain, chainring 300, and freewheel 1000. This not only improves riding efficiency but also reduces the risk of chain drop, asymmetrical tooth wear, and axial stress by expanding the meshing range between the chain and teeth, lowering the probability of tooth deformation, and extending the service life of transmission components. Furthermore, compared to the passive adjustment method of the traditional flywheel 1000 which relies on the chain to drive the chainring 300 to move when shifting gears, the active drive structure designed based on the nut 402 and the lead screw 401 in this application embodiment makes the movement of the chainring 300 smoother and more precise, and can significantly reduce the phenomenon of jamming.

[0048] The aforementioned control module 1010 can use electronic control devices, such as electronic switches, electronic control panels, etc., to enable direct manual control of operation. In this case, the position that the drive chainring 300 can move to can be adjusted by the user based on their riding experience.

[0049] The aforementioned control module 1010 can employ a microprocessor such as a single-chip microcomputer or DSP, for example, an STM32 series processor. This allows for direct automatic adjustment of the crankset 300's position, ensuring it remains in a favorable relative position with the freewheel 1000. For instance, without position detection, the energizing duration of the drive motor 404 in the electronic drive unit 403 can be directly controlled to adjust the crankset 300's position; for example, energizing for 1 second can move the crankset by the corresponding gear position. Furthermore, to achieve more accurate crankset 300 displacement control, the crankset 300 can be returned to its zero position (e.g., the leftmost or rightmost position) after each use of the bicycle to avoid cumulative errors.

[0050] The aforementioned bottom bracket 100 can be mounted on the frame 900 via the assembly mount 500. Specifically, the assembly mount 500 can be equipped with a bearing system, and the bottom bracket 100 is mounted on the bearing system to enable the bottom bracket 100 to rotate. In addition, crank connecting shafts can be provided at both ends of the bottom bracket 100 for connecting cranks. The cranks are used to mount pedals, and the rider rotates the cranks by pedaling, thereby driving the bottom bracket 100 to rotate.

[0051] The aforementioned bushing 200 is fitted onto the outer side of the central shaft 100 and can slide along the axial direction of the central shaft 100. After the chainring 300 is fixed on the bushing 200, the chainring 300 can be moved along the axial direction of the central shaft 100, thereby adjusting the relative position of the chainring 300 and the central shaft 100. The bushing 200 and the central shaft 100 are relatively fixed in the circumferential direction so that when the central shaft 100 rotates, it can drive the bushing 200 to rotate, thereby driving the chainring 300 to rotate.

[0052] The aforementioned drive mechanism 400 is mounted on the outside of the central shaft 100. The drive mechanism 400 includes a lead screw 401, a nut 402, and an electronically controlled drive unit 403. The lead screw 401 can be mounted on the assembly seat 500 or on the frame 900. The lead screw 401 can extend along the axial direction of the central shaft 100 and slide along the axial direction of the central shaft 100. The lead screw 401 cannot rotate around its own axis. It can be that the bushing 200 is rotatably connected to the end of the lead screw 401 near the chainring 300, or the chainring 300 is rotatably connected to the end of the lead screw 401 near the chainring 300, or both the bushing 200 and the chainring 300 are rotatably connected to the end of the lead screw 401 near the chainring 300. Nut 402 can be rotatably mounted on assembly seat 500 or frame 900. Nut 402 has a threaded hole and is threadedly connected to lead screw 401 through the threaded hole. Electric drive unit 403 can be mounted on assembly seat 500 or frame 900. Electric drive unit 403 is drively connected to nut 402 to drive nut 402 to rotate. Electric drive unit 403 drives nut 402 to rotate. Since lead screw 401 cannot rotate around its own axis, nut 402, through threaded connection with lead screw 401, can drive lead screw 401 to move. Lead screw 401 then drives bushing 200 to slide axially along central shaft 100, thereby driving chainring 300 to move axially along central shaft 100.

[0053] In some implementations, reference Figure 5 The electronically controlled drive unit 403 includes:

[0054] The drive motor 404 is electrically connected to the control module 1010;

[0055] The worm gear 407 is connected to the drive motor 404 at its input end and to the nut 402 at its output end.

[0056] In this embodiment, the electronically controlled drive unit 403 is equipped with a worm gear 407, which drives the nut 402 to rotate, making the drive more convenient and the rotation smoother.

[0057] In some implementations, such as Figure 5 As shown, nut 402 is configured as worm gear nut 402, and worm 407 meshes with worm gear nut 402.

[0058] The aforementioned worm gear nut 402 is formed by providing an internal thread on the inner circumferential wall of a conventional worm gear. The aforementioned electrically controlled drive unit 403 may further include a reducer 405. Both the drive motor 404 and the reducer 405 can be mounted on the assembly base 500 or the frame 900. The worm 407 can be rotatably mounted on the assembly base 500 or the frame 900. The output end of the drive motor 404 is connected to the input end of the reducer 405, and the output end of the reducer 405 is connected to the worm 407. The drive motor 404 drives the worm 407 to rotate via the reducer 405. The worm 407 drives the worm gear nut 402 to rotate through meshing with it, thereby driving the lead screw 401 to move axially along the central shaft 100.

[0059] In this embodiment, the nut 402 is configured as a worm gear nut 402, and the electric drive unit 403 drives the nut 402 to rotate via the worm 407, making the drive more convenient and the rotation smoother. The electric drive unit 403 can also be equipped with a reducer 405, which can control the rotation speed of the nut 402 according to actual needs, thereby controlling the movement speed of the lead screw 401, and thus controlling the movement speed of the gear sprocket 300, making it more convenient to use and more practical.

[0060] It should be noted that the outer peripheral wall of the nut 402 may also be provided with an external gear ring, and the electric drive unit 403 may be provided with a drive gear. The drive gear meshes with the external gear ring, thereby driving the nut 402 to rotate.

[0061] In some implementations, reference Figure 3 The lead screw type electronically controlled crankset movement assembly also includes:

[0062] The display unit 1020 is mounted on the frame 900 and is electrically connected to the control module 1010.

[0063] In this embodiment, by providing a display unit 1020 on the frame 900, the rider can easily understand the current position of the chainring 300 during riding, thereby facilitating the rider to improve the efficiency and accuracy of adjusting the chainring 300.

[0064] In some implementations, reference Figure 3 The lead screw type electronically controlled crankset movement assembly also includes:

[0065] The position detection unit 1030 is electrically connected to the control module 1010 and is used to obtain the position of the crankset 300 on the central axis 100.

[0066] In this embodiment, the current position of the chainring 300 can be directly determined by setting the position detection unit 1030, which makes it easier for the control module 1010 to adaptively adjust the position of the chainring 300 according to the current gear information of the freewheel 1000. Usually, the chainring 300 will correspond as closely as possible to the nut 402 corresponding to the current gear of the freewheel 1000 to reduce the tilt angle of the chain.

[0067] The aforementioned position detection unit 1030 can be configured in various ways. For example, a laser radar mounted on the frame 900 can be used to detect the distance between the frame 900 and the chainring 300, and then the position of the chainring 300 on the bottom bracket 100 can be determined by simple addition and subtraction. Alternatively, other non-contact sensors such as ultrasonic sensors can be used to complete the detection. In addition, a displacement sensor can be used to directly detect the movement distance of the lead screw 401. There are various specific detection methods, and no specific limitation is made in this embodiment.

[0068] In some embodiments, the lead screw type electrically controlled crankset movement assembly further includes:

[0069] Assembly seat 500 is used to mount on frame 900. Assembly seat 500 is provided with mounting hole 501, and central shaft 100 is rotatably mounted in mounting hole 501.

[0070] The aforementioned assembly base 500 may be detachably mounted on the frame 900. For example, the assembly base 500 may be snapped onto the frame 900 or mounted on the frame 900 by fasteners. The assembly base 500 is provided with a horizontally extending mounting hole 501, the two ends of which may pass through. The central shaft 100 may be mounted within the mounting hole 501 via a bearing system, thereby enabling the central shaft 100 to rotate.

[0071] In this embodiment, the central shaft 100 is installed in the assembly seat 500 to form an assembly structure, which makes installation and replacement more convenient and provides users with a better user experience.

[0072] In some implementations, reference Figure 5 The lead screw type electronically controlled crankset movement assembly also includes:

[0073] The first bearing 600 is installed at the end of the mounting hole 501 that is away from the toothed plate 300;

[0074] The second bearing 700 is installed at the end of the mounting hole 501 near the toothed plate 300;

[0075] The central shaft 100 is rotatably mounted within the first bearing 600 and the second bearing 700.

[0076] In this embodiment, the rotation setting of the central shaft 100 can be achieved by using the first bearing 600 and the second bearing 700, which satisfies the rotation requirements of the central shaft 100 and makes the rotation of the central shaft 100 smoother.

[0077] In some embodiments, the lead screw 401 is slidably installed in the mounting hole 501. The lead screw 401 has a sleeve hole that extends axially and is sleeved on the outside of the central shaft 100 through the sleeve hole. That is, the lead screw 401 is sleeve-shaped and sleeved on the outside of the central shaft 100. In this embodiment, this arrangement not only makes assembly more convenient, but also makes the force distribution more uniform and improves practicality.

[0078] It should be noted that in some embodiments, the lead screw 401 may not be a sleeve, but a solid rod. The lead screw 401 can be located on one side of the central shaft 100, which will not be elaborated further here.

[0079] In some embodiments, the wall of the bushing fits against the outer peripheral wall of the second bearing 700.

[0080] In this embodiment, this configuration not only makes the lead screw 401 more securely installed, but also reduces the resistance encountered when the lead screw 401 slides, and further makes the central shaft 100 more securely installed.

[0081] In some embodiments, the first bearing 600 may be a ball bearing. In this embodiment, the ball bearing's strong axial bearing capacity can better withstand the axial force when the crankset 300 moves, and the ball bearing can also better fix the central shaft 100.

[0082] It should be noted that the first bearing 600 can also be other suitable types of bearings, which will not be elaborated here.

[0083] In some implementations, such as Figure 5 As shown, the second bearing 700 is configured as a needle roller bearing. For example, the second bearing 700 may be a needle roller bearing without an inner ring.

[0084] In this embodiment, the second bearing 700 is configured as a needle roller bearing. The inner and outer rings of the needle roller bearing can move relative to each other in the axial direction. Even if the inner peripheral wall of the lead screw 401 is pressed against the outer peripheral wall of the second bearing 700, the lead screw 401 can still move in the axial direction of the central shaft 100. Moreover, it can reduce the axial friction force on the lead screw 401, making the axial movement of the lead screw 401 in the central shaft 100 smoother, and the gear shifting of the gear sprocket 300 smoother.

[0085] It should be noted that the second bearing 700 can also be other suitable types of bearings, such as roller bearings, which will not be elaborated here.

[0086] In some implementations, reference Figure 5 An anti-rotation part 502 is provided between the assembly seat 500 and the lead screw 401. The anti-rotation part 502 is used to restrict the lead screw 401 from rotating around its own axis.

[0087] The outer peripheral wall of the aforementioned lead screw 401 may be provided with a guide groove 406. The guide groove 406 extends along the axial direction of the lead screw 401. The anti-rotation part 502 can be inserted into the guide groove 406 and can slide relative to the guide groove 406.

[0088] In this embodiment, an anti-rotation part 502 is provided to prevent the lead screw 401 from rotating arbitrarily and affecting the effect of the nut 402 driving the lead screw 401 to move axially along the central shaft 100.

[0089] It is understandable that the lead screw 401 may only have external threads in some positions. For example, the position where the guide groove 406 is provided may not have external threads.

[0090] In some embodiments, the nut 402 is rotatably mounted on the assembly base 500 or the frame 900, and the electronically controlled drive unit 403 is mounted on the assembly base 500 or the frame 900.

[0091] In this embodiment, the nut 402 and the electronically controlled drive unit 403 can be mounted on the assembly base 500, thereby enabling the chainring 300 assembly to form a unified assembly structure, making assembly more convenient. Of course, the nut 402 and the electronically controlled drive unit 403 can also be mounted on the frame 900, which is more convenient for installation and wiring.

[0092] It should be noted that the reference Figure 5 Nut 402 can be mounted on assembly seat 500 or frame 900 via fourth bearing 408 to make nut 402 rotate more smoothly.

[0093] In some implementations, reference Figure 5 The lead screw type electronically controlled crankset movement assembly also includes:

[0094] The third bearing 800 is located on the bushing 200 and / or the toothed plate 300 and is coaxial with the bushing 200. The third bearing 800 is connected to the lead screw 401, and the bushing 200 rotates relative to the lead screw 401 through the third bearing 800.

[0095] The aforementioned third bearing 800 may include an inner ring and an outer ring that rotate relative to each other. One of the inner ring and the outer ring is fixedly connected to the bushing 200 and / or the toothed sprocket 300, and the other is fixedly connected to one end of the lead screw 401. The bushing 200 can rotate relative to the lead screw 401 by the relative rotation of the inner ring and the outer ring. The structure is simple, and the bushing 200 can rotate relative to the lead screw 401 when it rotates to any angle, which makes it more practical.

[0096] It should be noted that one of the inner and outer rings of the third bearing 800 can be fixedly connected to the bushing 200, fixedly connected to the gear sprocket 300, or fixedly connected to both the bushing 200 and the gear sprocket 300.

[0097] In some embodiments, a key structure 201 is installed between the bushing 200 and the central shaft 100. The bushing 200 can slide along the axial direction of the central shaft 100 through the key structure 201 and is relatively fixed to the central shaft 100 in the circumferential direction.

[0098] In this embodiment, both the outer peripheral wall of the central shaft 100 and the inner peripheral wall of the bushing 200 may be provided with keyways 101, the keyways 101 extending axially along the central shaft 100, and the key structure 201 installed within the two keyways 101 and capable of sliding relative to the keyways 101 along the axial direction of the central shaft 100. Alternatively, only one of the outer peripheral wall of the central shaft 100 and the inner peripheral wall of the bushing 200 may be provided with a keyway 101, the keyway 101 extending axially along the central shaft 100, and the key structure 201 installed within the other and extending into the keyway 101, the key structure 201 capable of sliding relative to the keyway 101 along the axial direction of the central shaft 100.

[0099] In this embodiment, the key structure 201 can restrict the relative rotation between the central shaft 100 and the bushing 200, thereby enabling the central shaft 100 to drive the toothed disc 300 on the bushing 200 to rotate.

[0100] See Figure 3 As shown, one embodiment of this application provides a bicycle gear shifting system, including:

[0101] Such as the lead screw type electrically controlled gearbox movement assembly mentioned above;

[0102] The flywheel speed changer is connected to the control module 1010 and is used to adjust the gear position of the flywheel 1000.

[0103] In this embodiment, the bicycle transmission system includes the lead screw type electronically controlled chainring moving assembly as described above, and thus has the beneficial effects of the lead screw type electronically controlled chainring moving assembly as described above, which will not be repeated here.

[0104] The aforementioned flywheel shifting device can adjust the gear position of the flywheel 1000, and can also feed back the current gear position information of the flywheel 1000 to the control module 1010, so that the control module 1010 can adjust the position of the chainring 300 according to the gear position information of the flywheel 1000.

[0105] The aforementioned flywheel transmission device can be made using a commercially available, mature electronically controlled flywheel 1000 transmission adjustment mechanism.

[0106] Understandably, when the flywheel derailleur does not have a memory function, the control module 1010 can memorize the gear change state according to control commands to determine the current gear position of the flywheel 1000. Furthermore, to reduce the impact of accumulated errors, after each stop of riding, the flywheel 1000 can be controlled to return to a specific gear, such as the intermediate gear.

[0107] In some implementations, reference Figure 3 The bicycle gear system also includes:

[0108] The torque detection unit 1040 is electrically connected to the control module 1010 and is used to detect the output torque of human stepping.

[0109] The cadence detection unit 1050 is electrically connected to the control module 1010 and is used to detect the cadence of a human pedaling the crank.

[0110] The torque detection unit 1040 mentioned above can be a torque sensor, stress sensor, etc., and can be installed on the crank, bottom bracket 100, etc. to detect the torque generated by the rider pressing the crank.

[0111] The aforementioned cadence detection unit 1050 can be a pressure sensor, angular velocity sensor, photoelectric sensor, contact sensor, etc., and can determine the rider's cadence by directly detecting the rotation frequency of structures such as the crank and chainring 300.

[0112] It should be noted that torque reflects the rider's effort level while riding. Generally, the more effort is exerted, the greater the torque. Cadence directly reflects the rider's pedaling speed. Generally, the faster the speed, the more effort is required. Based on the aforementioned principles, the rider's torque and cadence can be combined to effectively determine whether the rider is currently in a relatively strenuous state. When it is determined that the rider is exerting a lot of effort, the flywheel 1000 is controlled to shift up, and when it is too easy, the flywheel 1000 is controlled to shift down. There are many ways to determine riding status using torque and cadence. For example, one can directly use the product of torque and cadence, and then use this product and a pre-set threshold or threshold range to determine whether the riding state is ideal. For instance, if the product is greater than the pre-set threshold or threshold range, one can shift up; if it is less than the pre-set threshold or threshold range, one can shift down. Of course, one can also introduce a weighting factor to perform a weighted calculation on torque and cadence, thereby obtaining a better calculated value for judging the pre-set threshold or threshold range in some scenarios (the aforementioned product can be understood as a calculated value). Then, the calculated value and the pre-set threshold or threshold range can be used to complete the judgment. There are many ways to use this method, and the user can choose the method according to their actual needs.

[0113] In some implementations, reference Figure 3 The bicycle gear system also includes:

[0114] The human-machine interaction unit 1060 is communicatively connected to the control module 1010.

[0115] In this embodiment, taking into account the differences in individual physical fitness and the possibility that the bicycle may be used by multiple people, a human-computer interaction unit 1060 can be added to adjust the preset threshold or threshold range in order to better meet the usage needs of different cyclists.

[0116] It should be noted that, in the presence of other smart terminals, cyclists can also transmit instructions to the control module 1010 to modify the preset threshold or threshold range through other smart terminals, thereby completing the adjustment of the preset threshold or threshold range.

[0117] In some embodiments, the torque detection unit 1040 is disposed on the crank and / or chainring 300 and / or the bottom bracket 100; and / or,

[0118] The cadence detection unit 1050 is mounted on the crank and / or chainring 300 and / or bottom bracket 100.

[0119] The torque detection unit 1040 can be installed on the crank, chainring 300, or bottom bracket 100. Theoretically, it can detect torque. Although the values ​​obtained by direct detection may be different depending on the location, they can all be preprocessed through simple mathematical operations to obtain the output torque that can represent the rider's pedaling force.

[0120] The torque detection unit 1040 may include multiple torque sensors. In this case, torque sensors can be set at multiple locations in the crank, chainring 300, and bottom bracket 100. After normalization, the mean value can be calculated to obtain the torque closest to the real value and eliminate the error caused by the acquisition of a single sensor.

[0121] The torque detection unit 1040 can be installed on the crank, chainring 300, or bottom bracket 100. Theoretically, it can detect torque. Although the values ​​obtained by direct detection will be different depending on the location, they can all be obtained by simple preprocessing to represent the torque generated by the rider pedaling.

[0122] The aforementioned cadence detection unit 1050 may include multiple cadence sensors. In this case, torque sensors can be set at multiple locations in the crank, chainring 300, and bottom bracket 100. After normalization, the mean value can be calculated to obtain the cadence closest to the real one, eliminating the error caused by the acquisition of a single sensor.

[0123] In some implementations, reference Figure 3 The bicycle gear system also includes:

[0124] Lactic acid detection device 1070, communicatively connected to control module 1010, is used to detect lactic acid in the human body; and / or,

[0125] The heart rate detection device 1080 is communicatively connected to the control module 1010 and is used to detect human heart rate.

[0126] In this embodiment, considering that lactic acid and heart rate can effectively reflect the functional state of the human body, a lactic acid detection device 1070 is introduced to detect the cyclist's lactic acid, and a heart rate detection device 1080 is introduced to detect the heart rate. This allows for timely downshifting when lactic acid levels are high and heart rate is high, thus avoiding injury to the cyclist.

[0127] In addition, the lactate detected by the lactate detection device 1070 and / or the heart rate detected by the heart rate detection device 1080 can also be considered in combination with the aforementioned cadence and torque. For example, the gear control can be performed by using the product of the three or four, or by using the weighted calculation result of the three or four. The specific control method can refer to the aforementioned cadence and torque control method.

[0128] In some implementations, reference Figure 3 The bicycle gear system also includes:

[0129] The blood pressure detection device 1090 is communicatively connected to the control module 1010 and is used to detect human blood pressure.

[0130] In this embodiment, considering that blood pressure can effectively reflect the functional state of the human body, a blood pressure detection device 1090 is introduced to detect the rider's blood pressure, so that when the blood pressure is too high, the gear can be downshifted in time to avoid injury to the rider.

[0131] In addition, the heart rate detected by the blood pressure monitoring device 1090 can also be considered in conjunction with the aforementioned cadence and torque. For example, the product of the three and the weighted sum of the three can be used to calculate the gear control. The specific control method can refer to the aforementioned cadence and torque control method.

[0132] It should be noted that lactate, heart rate, and blood pressure can be selectively combined with cadence and torque according to actual needs. You can choose one of them to combine with cadence and torque, or you can choose multiple parameters. When multiple parameters are selected, they can be comprehensively considered with the cadence and torque obtained above. For example, you can use the product of all selected parameters, or the weighted calculation result of all selected parameters, to control the gear. For specific control methods, please refer to the above-mentioned cadence and torque control methods.

[0133] In some implementations, the lactate detection device 1070, the heart rate detection device 1080, and the blood pressure detection device 1090 can all be installed on a smart wearable device, and the collected data can be transmitted to the control module 1010 via wireless communication through the smart wearable device.

[0134] The lactate detection device 1070, heart rate detection device 1080, and blood pressure detection device 1090 mentioned above can all be directly adopted from commercially available products.

[0135] In some implementations, the lactate detection device 1070, the heart rate detection device 1080, and the blood pressure detection device 1090 can be equipped with separate detection modules. These detection modules can be connected to the control module 1010 via data cables. When in use, the detection modules are installed on the cyclist, and when not in use, they can be hung on the bicycle.

[0136] This application also provides a bicycle that includes the lead screw type electronic chainring movement assembly as described above. Because the bicycle has the lead screw type electronic chainring movement assembly, it possesses all the beneficial effects of such an assembly.

[0137] The above are merely specific embodiments of this application, which can be clearly understood by those skilled in the art. It should be understood that the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the scope of the technology disclosed in this application, and such modifications or substitutions should all be covered within the scope of protection of this application.

Claims

1. A lead screw type electrically controlled crankset movement assembly, characterized in that, include: The center axle is used for rotatable mounting to the chassis; A bushing is fitted onto the central shaft and can slide along the axial direction of the central shaft. The bushing and the central shaft are relatively fixed to each other in the circumferential direction of the central shaft. The toothed disc is disposed on the bushing; A drive mechanism is installed on the outside of the central shaft. The drive mechanism includes a lead screw, a nut, and an electrically controlled drive unit. The lead screw extends along the axial direction of the central shaft and can slide along the axial direction of the central shaft. The bushing and / or the toothed sprocket are rotatably connected to the lead screw. The nut can rotate about its own axis. The nut is threadedly connected to the lead screw. The electrically controlled drive unit is drively connected to the nut. The control module is electrically connected to the electronically controlled drive unit and is used to control the operation of the electronically controlled drive unit so as to drive the nut to rotate, thereby causing the lead screw to move, and thus driving the toothed sprocket and / or the bushing to move.

2. The lead screw type electrically controlled crankset movement assembly according to claim 1, characterized in that, The electronically controlled drive unit includes: A drive motor is electrically connected to the control module; The worm gear has its input end connected to the drive motor and its output end connected to the nut.

3. The lead screw type electrically controlled crankset movement assembly according to claim 1, characterized in that, The lead screw type electrically controlled crankcase movement assembly also includes: The position detection unit is electrically connected to the control module and is used to obtain the position of the dental disc on the central axis.

4. The lead screw type electrically controlled crankset movement assembly according to claim 1, characterized in that, The lead screw type electrically controlled crankcase movement assembly also includes: An assembly mount is provided for mounting on the vehicle frame, and the assembly mount is provided with mounting holes in which the central shaft is rotatably mounted.

5. The lead screw type electrically controlled crankcase moving assembly according to claim 4, characterized in that, The lead screw type electrically controlled crankcase movement assembly also includes: A first bearing is installed at the end of the mounting hole away from the toothed disc; The second bearing is installed at one end of the mounting hole near the toothed disc; The central shaft is rotatably mounted within the first bearing and the second bearing.

6. The lead screw type electrically controlled crankcase moving assembly according to claim 4, characterized in that, An anti-rotation part is provided between the assembly seat and the lead screw, which is used to restrict the lead screw from rotating around its own axis.

7. The lead screw type electrically controlled crankset movement assembly according to claim 1, characterized in that, The lead screw type electrically controlled crankcase movement assembly also includes: A third bearing is disposed on the bushing and / or the toothed disc and is coaxial with the bushing. The third bearing is connected to the lead screw, and the bushing rotates relative to the lead screw through the third bearing.

8. A bicycle gear shifting system, characterized in that, include: The lead screw type electrically controlled crank plate moving assembly as described in any one of claims 1 to 7; The flywheel speed changer is electrically connected to the control module and is used to adjust the flywheel's gear position.

9. The bicycle transmission system according to claim 8, characterized in that, Also includes: The torque detection unit is electrically connected to the control module and is used to detect the output torque of human stepping. The cadence detection unit is electrically connected to the control module and is used to detect the cadence of a human pedaling the crank.

10. A bicycle, characterized in that, Includes the lead screw type electronically controlled crank plate movement assembly as described in any one of claims 1 to 7.

Images