Direct drive pedal device and bicycle

Abstract

The application discloses a direct drive type sprocket device and a bicycle. A linear motor is arranged between a frame and a middle shaft, and a motor rotor is sleeved on the middle shaft and can move along the middle shaft in the axial direction, thereby driving the sprocket fixedly connected with the motor rotor to move along the middle shaft in the axial direction, so that the included angle between the sprocket and the chain is adjusted, the degree of the included angle deviating from the ideal zero degree is reduced, the axial component force caused by the included angle when the chain transmits driving force is reduced, the effective power for driving the driving flywheel to rotate is improved, and finally the riding efficiency is improved. With the linkage mechanism of the linear motor and the sprocket, the transmission included angle is accurately controlled, and a reliable path is provided for optimizing the power transmission efficiency of the variable speed bicycle. In addition, because the included angle is reduced, the meshing cutting range of the chain and the tooth is wider, the chain falling back is reduced, the asymmetric wear of the tooth part is reduced, the axial stress of the tooth part is reduced, the deformation of the tooth is reduced, and the service life is prolonged.

Description

Technical Field

[0001] This application relates to the field of bicycles, and in particular to a direct-drive chainring device and a bicycle. Background Technology

[0002] In current bicycle shifting technology, when a rider shifts gears on a multi-speed bicycle, the chain can flexibly switch between different levels of freewheel sprockets. As the gear changes, the angle between the chain and the chainring, and between the chain and the freewheel, also changes accordingly. Ideally, this angle is zero degrees. However, the greater the angle deviates from zero degrees, the more axial force is generated when the chain transmits driving force. This axial force weakens the effective power driving the freewheel's rotation, resulting in a significant decrease in riding efficiency. Utility Model Content

[0003] This application aims to provide a direct-drive chainring device and bicycle that can improve the riding efficiency of cyclists.

[0004] The direct-drive crankset device according to a first aspect embodiment of this application includes:

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

[0006] A linear motor includes a motor stator and a motor rotor; the motor rotor is sleeved on the central shaft and extends outside the vehicle frame; the motor stator is sleeved on the motor rotor; the motor rotor is located between the motor stator and the central shaft, and the motor stator is located between the motor rotor and the vehicle frame, and the motor stator is used to drive the motor rotor to move axially along the central shaft;

[0007] The crankset is fixedly connected to one end of the motor rotor extending outside the frame; the crankset and / or the motor rotor are drive-connected to the bottom bracket.

[0008] The electronic control module is electrically connected to the stator of the motor.

[0009] The bicycle according to a second aspect embodiment of this application includes a direct-drive chainring as described in the first aspect embodiment.

[0010] The direct-drive chainring device and bicycle of this application embodiment, by setting a linear motor between the frame and the bottom bracket, and sleeved the motor rotor on the bottom bracket so that it can move along the bottom bracket axis, thereby driving the chainring, which is fixedly connected to the motor rotor, to move synchronously along the bottom bracket axis. This achieves adjustment of the angle between the chainring and the chain, ultimately reducing the degree to which the angle deviates from the ideal zero degree, reducing the axial component force generated by the angle when the chain transmits driving force, increasing the effective power to drive the freewheel, and ultimately improving riding efficiency. This application embodiment, by utilizing the linkage mechanism between the linear motor and the chainring, precisely controls the transmission angle, providing a reliable path for optimizing the power transmission efficiency of a geared bicycle. In addition, because the angle is smaller, the meshing range between the chain and the teeth is wider, which can reduce chain slippage, reduce asymmetrical wear of the teeth, reduce axial force on the teeth, and help reduce tooth deformation, thereby extending service life.

[0011] 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 this application. Attached Figure Description

[0012] 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:

[0013] Figure 1 This is a schematic diagram illustrating the connection between a traditional chainring and a freewheel.

[0014] Figure 2 A schematic diagram illustrating the fit between the chainring and the freewheel in an embodiment of this application;

[0015] Figure 3 This is a schematic diagram of the overall structure of the direct-drive crankset provided in the embodiments of this application;

[0016] Figure 4 A partial cross-sectional view of the direct-drive crankset device provided in the embodiments of this application;

[0017] Figure 5 Electrical system diagram of a direct-drive crankset provided in an embodiment of this application.

[0018] Figure label:

[0019] Central shaft 100; limiting protrusion 101;

[0020] Crankset 200;

[0021] Motor stator 301; Motor rotor 302;

[0022] First bearing 400; Axial locking structure 401; Locking plug 402; Sealing ring 403;

[0023] Second bearing 500; End cap 501;

[0024] Assembly unit 600;

[0025] Frame 700;

[0026] Flywheel 800;

[0027] Electronic control module 910; display unit 920; position detection unit 930; energy storage unit 940; wireless communication module 950. Detailed Implementation

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] To better describe the direct-drive chainring device and bicycle of the embodiments of this application, a brief description is given here of the change in the 200° angle between the chain and the chainring during conventional bicycle gear shifting. (Reference) Figure 1When the chain is in the highest gear (highest gear ratio) on the cassette 800, there is a large angle θ between the chain and the chainring 200. Because of this angle θ, a significant axial component of the chain's driving force cannot be used to drive the cassette 800, 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 200 before it moves, and the solid rectangle can be understood as the position of the crankset 200 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.

[0034] Based on the above scenario, the direct-drive chainring device and bicycle of the present application embodiment are described below.

[0035] See Figures 3 to 5 As shown, one embodiment of this application provides a direct-drive crankset device, which includes:

[0036] The central axle 100 is used for rotatable mounting on the frame 700;

[0037] A linear motor includes a motor stator 301 and a motor rotor 302; the motor rotor 302 is sleeved on the central shaft 100 and extends outside the frame 700; the motor stator 301 is sleeved on the motor rotor 302; the motor rotor 302 is located between the motor stator 301 and the central shaft 100, and the motor stator 301 is located between the motor rotor 302 and the frame 700, and the motor stator 301 is used to drive the motor rotor 302 to move axially along the central shaft 100;

[0038] The chainring 200 is fixedly connected to one end of the motor rotor 302 extending outside the frame 700; the chainring 200 and / or the motor rotor 302 are drive-connected to the bottom bracket 100;

[0039] The electronic control module 910 is electrically connected to the motor stator 301.

[0040] In this embodiment, a linear motor is installed between the frame 700 and the bottom bracket 100, and the motor rotor 302 is fitted onto the bottom bracket 100 so that it can move axially along the bottom bracket 100. This drives the chainring 200, which is fixedly connected to the motor rotor 302, to move synchronously along the bottom bracket 100. This achieves adjustment of the angle between the chainring 200 and the chain, ultimately reducing the degree to which the angle deviates from the ideal zero degree, reducing the axial component force generated by the angle when the chain transmits driving force, increasing the effective power to drive the freewheel 800, and ultimately improving riding efficiency. This embodiment utilizes the linkage mechanism between the linear motor and the chainring 200 to precisely control the transmission angle, providing a reliable path for optimizing the power transmission efficiency of a geared bicycle. Furthermore, because the angle is smaller, the meshing range between the chain and the teeth is wider, which can reduce chain slippage, reduce asymmetrical wear of the teeth, reduce axial force on the teeth, and help reduce tooth deformation, thereby extending service life.

[0041] The frame 700 is provided with mounting through holes for mounting the bottom axle 100 or the assembly seat 600. The bottom axle 100 can be rotated relative to the frame 700 through a bearing system, and when the assembly seat 600 is present, it can be rotated relative to the assembly seat 600.

[0042] The stator 301 of the linear motor is fixedly mounted on the frame 700 or the assembly base 600. The motor rotor 302 has a through-hole design, meaning that a through hole is provided along the length of the motor rotor 302, through which the central shaft 100 can pass. Simultaneously, to make the connection between the motor rotor 302 and the chainring 200 more stable, the area of ​​the end of the motor rotor 302 away from the frame 700 is increased, for example, by making it a connecting disc, plate, or other structure that can increase connection stability. Furthermore, to make the synchronous rotation of the motor rotor 302 and the central shaft 100 smoother, the portion of the motor rotor 302 that needs to move into the motor stator 301 is made into a hollow cylinder.

[0043] The aforementioned motor rotor 302 can move along the axial direction of the central shaft 100 and rotate synchronously with the central shaft 100. To achieve this, a keyway that moves along the axial direction of the central shaft 100 can be opened on the central shaft 100, and a key that connects to the keyway can be provided on the inner side of the motor rotor 302 and / or a key that connects to the keyway can be provided on the inner side of the toothed slab 200. Thus, the axial movement of the toothed slab 200 and the synchronous rotation of the toothed slab 200 with the central shaft 100 can be achieved by using the mating structure of the key and the keyway.

[0044] It should be noted that the motor rotor 302 or the chainring 200 can also be connected to the central shaft 100 via an overrunning clutch. That is, neither the motor rotor 302 nor the chainring 200 is keyed to the central shaft 100. Instead, they are directly connected to the overrunning clutch, which is then keyed to the central shaft 100. This allows the central shaft 100 to rotate synchronously when the chainring 200 and the motor rotor 302 rotate in the forward direction, and to rotate in the reverse direction without affecting the rotation of the central shaft 100.

[0045] The aforementioned electronic control module 910 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 200 can move to can be adjusted by the user based on their riding experience.

[0046] The aforementioned control module 910 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 chainring 200's position, ensuring it remains in an optimal relative position with the freewheel 800. For instance, without position detection, the energizing duration of the motor stator 301 can be directly controlled to adjust the chainring 200's position; for example, 1 second of energizing can move the chainring by the corresponding gear. Furthermore, to achieve more accurate chainring 200 displacement control, the chainring 200 can be returned to its zero position (e.g., the leftmost or rightmost position) after each use of the bicycle to avoid cumulative errors.

[0047] In some implementations, reference Figure 3 , Figure 4 The direct-drive crankset also includes:

[0048] The assembly base 600 is mounted on the frame 700; the linear motor and the central shaft 100 are located inside the assembly base 600.

[0049] The aforementioned assembly base 600 can be detachably mounted on the frame 700. For example, the assembly base 600 can be snapped onto the frame 700 or mounted on the frame 700 by fasteners. The assembly base 600 has a mounting hole extending horizontally, with both ends of the mounting hole penetrating through it. The motor stator 301 of the linear motor can be installed within the mounting hole, the central shaft 100 can be installed within the motor rotor 302, and the bearing system can be located within the mounting hole at the end away from the crankset 200, forming a rotational support for the central shaft 100 to enable the central shaft 100 to rotate.

[0050] In this embodiment, the entire direct-drive crankset can be configured as an assembly structure, and the assembly base 600 can be used to quickly install and replace the entire direct-drive crankset, providing users with a better user experience.

[0051] In some implementations, reference Figure 4 The direct-drive crankset also includes:

[0052] First bearing 400; bottom axle 100 passes through first bearing 400; first bearing 400 is located between bottom axle 100 and frame 700, and on the side away from chainring 200; first bearing 400 is used to support rotation of bottom axle 100.

[0053] In this embodiment, the rotational support of the central shaft 100 can be achieved by using the first bearing 400, and the first bearing 400 is set away from the toothed sprocket 200, which can also provide installation space for the motor stator 301 of the linear motor.

[0054] In some implementations, reference Figure 4 A limiting protrusion 101 is provided on the outer peripheral wall of the central shaft 100, and on the side of the first bearing 400 near the toothed plate 200;

[0055] Direct-drive cranksets also include:

[0056] The axial locking structure 401 is located on the side of the first bearing 400 away from the toothed disc 200.

[0057] In this embodiment, a limiting protrusion 101 is provided on the outer peripheral wall of the central shaft 100 to provide restriction in one direction. At the same time, an axial locking structure 401 is provided on the outer peripheral wall of the central shaft 100 on the side of the first bearing 400 away from the bushing to provide restriction on the first bearing 400 in another direction. Finally, the restriction on the axial movement of the central shaft 100 is completed.

[0058] The aforementioned axial locking structure 401 can be an axial locking nut. The outer peripheral wall of the end of the central shaft 100 away from the bushing can be provided with external threads. The axial locking nut is threadedly connected to the central shaft 100. Of course, the axial locking structure 401 can also be a locking ring. The outer peripheral wall of the end of the central shaft 100 away from the bushing can be provided with a retaining ring. The axial lock is locked in the retaining ring.

[0059] In some implementations, reference Figure 4 A locking plug 402 is provided on the side of the first bearing 400 away from the toothed disc 200, and the locking plug 402 is located on the outer periphery of the axial locking structure 401.

[0060] In this embodiment, the first bearing 400 can be fixed by using the locking screw plug 402.

[0061] In some implementations, reference Figure 4 When there is a gap between the locking screw plug 402 and the axial locking structure 401, a sealing ring 403 can be provided between the locking screw plug 402 and the axial locking structure 401.

[0062] In some implementations, the end cap 501 can also be configured as an axial locking nut.

[0063] In some implementations, reference Figure 4 The direct-drive crankset also includes:

[0064] The second bearing 500 is mounted on the frame 700 and located on the side near the chainring 200; the motor rotor 302 passes through the second bearing 500; the second bearing 500 is used to provide rotational support and axial movement support for the motor rotor 302.

[0065] In this embodiment, the provision of the second bearing 500 can effectively improve the smoothness of the movement and rotation of the motor rotor 302 relative to the motor stator 301, and can also reduce the losses caused by rotation and movement.

[0066] In some implementations, the second bearing 500 is a roller bearing.

[0067] In this embodiment, roller bearings are used, which, compared to ordinary bearings, can better meet the needs of both movement and rotation at the same time.

[0068] In some implementations, reference Figure 4 On the assembly seat 600 or the frame 700, an end cover 501 can be provided on the side of the second bearing 500 away from the first bearing 400. The end cover 501 can be located on the outside of the motor rotor 302 to fix and seal the second bearing 500.

[0069] In some implementations, reference Figure 5 The direct-drive crankset also includes:

[0070] The display unit 920 is mounted on the frame 700 and is electrically connected to the electronic control module 910.

[0071] In this embodiment, by providing a display unit 920 on the frame 700, the rider can easily understand the current position of the chainring 200 during riding, thereby facilitating the rider to improve the efficiency and accuracy of adjusting the chainring 200.

[0072] In some implementations, reference Figure 5 The direct-drive crankset also includes:

[0073] The position detection unit 930 is electrically connected to the electronic control module 910 and is used to obtain the position of the crankset 200 on the central axis 100.

[0074] In this embodiment, the current position of the chainring 200 can be directly determined by setting the position detection unit 930, which makes it easier for the electronic control module 910 to adaptively adjust the position of the chainring 200 according to the current gear information of the freewheel 800. Usually, the chainring 200 will correspond as closely as possible to the gear corresponding to the current gear of the freewheel 800 to reduce the tilt angle of the chain.

[0075] The aforementioned position detection unit 930 can be configured in various ways. For example, a laser radar mounted on the frame 700 can be used to detect the distance between the frame 700 and the chainring 200, and then the position of the chainring 200 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 for detection. In addition, a displacement sensor can be used to directly detect the movement distance of the linear motor rotor 302. There are various specific detection methods, and no specific limitation is made in this embodiment.

[0076] In some embodiments, the position detection unit 930 includes a displacement sensor electrically connected to the electronic control module 910, the displacement sensor being used to detect the distance traveled by the motor rotor 302.

[0077] In this embodiment, the displacement sensor is used to directly measure the movement distance of the motor rotor 302, which can effectively reduce the interference of external factors on the detection, improve the accuracy of the detection, and also effectively reduce the damage of external impacts to the position detection unit 930.

[0078] It should be noted that when the displacement sensor needs to be placed in the gap between the central shaft 100 and the motor stator 301, a wire hole can be opened on the assembly seat 600 for the displacement sensor to transmit data.

[0079] In some implementations, reference Figure 5 The direct-drive crankset also includes:

[0080] The energy storage unit 940 is used to provide power to the motor stator 301 and the electronic control module 910.

[0081] In this embodiment, the energy storage unit 940 is directly used as the power source, such as a lithium battery, which can effectively improve the user experience, as the user no longer needs to use an external power source for power supply.

[0082] In some implementations, the motor stator 301 and the electronic control module 910 can be powered by a mobile power supply.

[0083] In some implementations, reference Figure 5 The direct-drive crankset also includes:

[0084] The wireless communication module 950 is electrically connected to the electronic control module 910.

[0085] The aforementioned wireless communication module 950 can achieve wireless communication with the outside world. For example, the current relative position of the chainring 200 can be transmitted to the outside world through the wireless communication module 950. It can also upload the operating data collected by the other bicycle electronic control modules 910 to the cloud for storage and recording, so as to provide users with more in-depth services in the future.

[0086] The aforementioned wireless communication module 950 can be Bluetooth, WIFI, or other wireless communication modules 950. The specific choice depends on the actual needs.

[0087] This application also provides a bicycle that includes the direct-drive chainring as described above. Because the bicycle has a direct-drive chainring, it possesses all the beneficial effects of a direct-drive chainring.

[0088] The above are merely specific embodiments of this application. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, modules, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here. It should be understood that the protection scope of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and these modifications or substitutions should all be covered within the protection scope of this application.

Claims

1. A direct-drive crankset device, characterized in that, include: The center axle is used for rotatable mounting to the chassis; A linear motor includes a motor stator and a motor rotor; the motor rotor is sleeved on the central shaft and extends outside the vehicle frame; the motor stator is sleeved on the motor rotor; the motor rotor is located between the motor stator and the central shaft, and the motor stator is located between the motor rotor and the vehicle frame, and the motor stator is used to drive the motor rotor to move axially along the central shaft; The crankset is fixedly connected to one end of the motor rotor extending outside the frame; the crankset and / or the motor rotor are drive-connected to the bottom bracket. The electronic control module is electrically connected to the stator of the motor.

2. The direct-drive crankset device according to claim 1, characterized in that, Also includes: The assembly base is mounted on the vehicle frame; the linear motor and the central shaft are disposed within the assembly base.

3. The direct-drive crankset device according to claim 1, characterized in that, Also includes: A first bearing; the bottom bracket passes through the first bearing; the first bearing is disposed between the bottom bracket and the frame, and is located on the side away from the chainring; the first bearing is used to provide rotational support for the bottom bracket.

4. The direct-drive crankset device according to claim 3, characterized in that, A limiting protrusion is provided on the outer peripheral wall of the central shaft, and on the side of the first bearing near the toothed disc; The direct-drive crankset also includes: An axial locking structure is located on the side of the first bearing away from the toothed disc.

5. The direct-drive crankset device according to claim 4, characterized in that, A locking plug is provided on the side of the first bearing away from the toothed disc, and the locking plug is located on the outer peripheral side of the axial locking structure.

6. The direct-drive crankset device according to claim 1, characterized in that, Also includes: The second bearing is mounted on the frame and located on the side close to the chainring; the motor rotor passes through the second bearing; the second bearing is used to support the rotation and axial movement of the motor rotor.

7. The direct-drive crankset device according to claim 6, characterized in that, The second bearing is a roller bearing.

8. The direct-drive crankset device according to claim 1, characterized in that, The direct-drive crankset also includes: The display unit is mounted on the vehicle frame and is electrically connected to the electronic control module.

9. The direct-drive crankset device according to claim 1, characterized in that, The direct-drive crankset also includes: The position detection unit is electrically connected to the electronic control module and is used to obtain the position of the dental disc on the central axis.

10. A bicycle, characterized in that, Includes the direct-drive crankset as described in any one of claims 1 to 9.

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