Direct drive type pedal mechanism and bicycle

Abstract

This application discloses a direct-drive chainring mechanism and a bicycle. By placing a linear motor between the frame and the bottom bracket, and fitting the motor rotor onto the bottom bracket to allow it to move axially along the bottom bracket, and connecting a bushing fitted onto the bottom bracket to the motor rotor, the chainring can be moved synchronously along the bottom bracket axially by controlling the working state of the motor stator. This adjusts the angle between the chainring and the chain, reducing the deviation of the angle from the ideal zero degree, decreasing 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 embodiment of the application provides a reliable path for optimizing the power transmission efficiency of a multi-speed bicycle by utilizing the linkage mechanism between the linear motor and the chainring. Furthermore, because the angle is smaller, the meshing range between the chain and the teeth is wider, reducing chain slippage, asymmetrical wear of the teeth, and axial force on the teeth.

Description

Technical Field

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

[0002] In current bicycle shifting technology, when a rider operates a multi-speed bicycle to shift gears, the chain smoothly switches between different levels of the freewheel. As the gear changes, the angle between the chain and the chainring, and between the chain and the freewheel, also changes. Ideally, this angle is zero degrees. However, the greater the deviation of the angle from zero degrees, the more axial force is generated on the chain when transmitting driving force. This axial force weakens the effective power driving the freewheel's rotation, increasing energy loss during riding and ultimately leading to a significant decrease in riding efficiency. Utility Model Content

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

[0004] The direct-drive crank mechanism according to the first aspect 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; 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; the motor stator is used to drive the motor rotor to move axially along the central shaft.

[0007] A bushing is fitted onto the central shaft and fixedly connected to one end of the motor rotor;

[0008] The toothed plate is fixedly connected to the end of the bushing away from the motor rotor; the toothed plate and / or the motor rotor and / or the bushing are connected to the central shaft drive.

[0009] The electronic control module is electrically connected to the stator of the motor.

[0010] The bicycle according to a second aspect embodiment of this application includes a direct-drive chainring mechanism as described in the first aspect embodiment.

[0011] This application's direct-drive chainring mechanism and bicycle, through the placement of a linear motor between the frame and the bottom bracket, and the motor rotor sleeved on the bottom bracket to allow axial movement along the bottom bracket, and the connection of a bushing sleeve on the bottom bracket to the motor rotor, allows the chainring to move synchronously along the bottom bracket axially by controlling the working state of the motor stator. This achieves adjustment of the angle between the chainring and the chain, ultimately reducing the deviation of the angle 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's embodiment utilizes the linkage mechanism between the linear motor and the chainring 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, reducing chain slippage, asymmetrical wear of the teeth, and axial force on the teeth, which helps to reduce tooth deformation and thus extend service life.

[0012] 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

[0013] 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:

[0014] Figure 1 This is a schematic diagram illustrating the connection between a traditional chainring and a freewheel.

[0015] Figure 2 A schematic diagram illustrating the fit between the chainring and the freewheel in an embodiment of this application;

[0016] Figure 3 This is a schematic diagram of the overall structure of the direct-drive crank mechanism provided in the embodiments of this application;

[0017] Figure 4 A partial cross-sectional view of a direct-drive crank mechanism provided in an embodiment of this application;

[0018] Figure 5 An electrical system diagram of a direct-drive crank mechanism provided in an embodiment of this application.

[0019] Figure label:

[0020] Central shaft 100; limiting protrusion 101;

[0021] Crankset 200;

[0022] Motor stator 301; Motor rotor 302;

[0023] 400 bushing;

[0024] First bearing 500; End cap 501;

[0025] Second bearing 600; Axial locking structure 601; Locking plug 602; Sealing ring 603;

[0026] 700 units for the entire assembly;

[0027] Frame 800;

[0028] Flywheel 900;

[0029] Electronic control module 1010; display unit 1020; position detection unit 1030; energy storage unit 1040; wireless communication module 1050. Detailed Implementation

[0030] 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.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] To better describe the direct-drive chainring mechanism 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 the traditional bicycle gear shifting process. (Reference) Figure 1When the chain is in the highest gear (highest gear ratio) on the cassette 900, 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 900, 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.

[0036] Based on the above scenario, the direct-drive chainring mechanism and bicycle of the present application embodiment are described below.

[0037] See Figures 3 to 5 As shown, one embodiment of this application provides a direct-drive crankset mechanism, which includes:

[0038] The central shaft 100 is used for rotatable mounting on the frame 800;

[0039] A linear motor includes a motor stator 301 and a motor rotor 302; the motor rotor 302 is sleeved on a central shaft 100; 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 800; the motor stator 301 is used to drive the motor rotor 302 to move axially along the central shaft 100.

[0040] A bushing 400 is fitted onto the central shaft 100 and is fixedly connected to one end of the motor rotor 302;

[0041] The toothed sprocket 200 is fixedly connected to the end of the bushing 400 away from the motor rotor 302; the toothed sprocket 200 and / or the motor rotor 302 and / or the bushing 400 are connected to the central shaft 100 for transmission.

[0042] The electrical control module 1010 is electrically connected to the motor stator 301.

[0043] In this embodiment, a linear motor is installed between the frame 800 and the bottom bracket 100, and the motor rotor 302 is sleeved on the bottom bracket 100 so that it can move axially along the bottom bracket 100. Simultaneously, a bushing 400 sleeved on the bottom bracket 100 is connected to the motor rotor 302. By controlling the working state of the motor stator 301, the chainring 200 can move synchronously along the bottom bracket 100, thereby adjusting the angle between the chainring 200 and the chain. This reduces the deviation of the angle from the ideal zero degree, decreases the axial component force generated by the angle when the chain transmits driving force, and increases the effective power to drive the freewheel 900, ultimately improving riding efficiency. This embodiment, through the linkage mechanism between the linear motor and the chainring 200, precisely controls the transmission angle, providing a reliable path for optimizing the power transmission efficiency of a multi-speed bicycle. Furthermore, the smaller included angle allows for a wider meshing range between the chain and the teeth, reducing chain slippage, asymmetrical wear on the teeth, and axial stress on the teeth, which helps reduce tooth deformation and thus extends service life.

[0044] The frame 800 is provided with mounting through holes for mounting the bottom axle 100 or the assembly seat 700. The bottom axle 100 can be rotated relative to the frame 800 through a bearing system, and when the assembly seat 700 is present, it can be rotated relative to the assembly seat 700.

[0045] The stator 301 of the linear motor is fixedly mounted on the frame 800 or the assembly base 700. 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. Furthermore, in order to make the synchronous rotation of the motor rotor 302 and the central shaft 100 smoother, the part of the motor rotor 302 that needs to move into the motor stator 301 needs to be set as a hollow cylinder.

[0046] The aforementioned bushing 400 is fitted onto the central shaft 100, for reference. Figure 4 As shown, the area of ​​the end of the bushing 400 connected to the toothed disc 200 has been increased. For example, it can be configured as a connecting disc, a plate, or other structure that can increase the connection stability, so that the connection between the motor rotor 302 and the toothed disc 200 can be more stable.

[0047] 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 on the inner side of the toothed sprocket 200 and / or on the inner side of the sleeve can be provided. Thus, the axial movement of the toothed sprocket 200 and the synchronous rotation of the toothed sprocket 200 with the central shaft 100 can be achieved by using the key and keyway mating structure.

[0048] It should be noted that the motor rotor 302, the crank 200, or the bushing 400 can also be connected to the central shaft 100 via an overrunning clutch. That is, the motor rotor 302, the crank 200, and the bushing 400 are not keyed to the central shaft 100, but are directly connected to the overrunning clutch, and then the overrunning clutch is keyed to the central shaft 100. This allows the central shaft 100 to rotate synchronously when the crank 200 and the motor rotor 302 rotate in the forward direction, and will not affect the rotation of the central shaft 100 when they rotate in the reverse direction.

[0049] The aforementioned electronic control module 1010 can use electronic control devices, such as electronic switches, electronic control panels, etc., to achieve direct manual control of operation. At this time, the position that the drive chainring 200 can move to can be adjusted by the user based on the riding experience of the electronic control module 1010.

[0050] 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 chainring 200's position, ensuring it remains in an optimal relative position with the freewheel 900. For instance, without position detection, the chainring 200's position can be adjusted by directly controlling the energizing duration of the motor stator 301; for example, energizing for 1 second can move the chainring by the corresponding gear position. Furthermore, to more accurately control the chainring 200's displacement, it can be automatically returned to its zero position (e.g., the leftmost or rightmost position) after each use of the bicycle to avoid cumulative errors.

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

[0052] The first bearing 500 is mounted on the frame 800 and located on the side close to the chainring 200. The first bearing 500 is coaxially mounted with the motor rotor 302 and the bushing 400, and the first bearing 500 is located on the outer periphery of the motor rotor 302 and / or the bushing 400.

[0053] In this embodiment, the first bearing 500 can effectively improve the smoothness of the movement and rotation of the motor rotor 302 and / or bushing 400 relative to the motor stator 301, and can also reduce the losses caused by rotation and movement.

[0054] The inner circumference of the first bearing 500 can be smaller than the outer circumference of the motor rotor 302. In this case, the outer circumference of the bushing 400 needs to be smaller than the inner circumference of the first bearing 500 so that the motor rotor 302 can drive the bushing 400 to move along the central shaft 100 within the area covered by the motor stator 301.

[0055] The inner circumference of the first bearing 500 can be larger than the outer circumference of the motor rotor 302. In this case, the outer circumference of the bushing 400 can be smaller than or larger than the inner circumference of the first bearing 500. If the outer circumference of the bushing 400 is larger than the inner circumference of the first bearing 500, the motor rotor 302 needs to be lengthened so that it can extend beyond the first bearing 500 to synchronously drive the bushing 400. If the outer circumference of the bushing 400 is smaller than the inner circumference of the first bearing 500, no additional processing is required. It is understood that the best support effect can be obtained when the outer circumference of the motor rotor 302 is consistent with the outer circumference of the bushing 400.

[0056] In some implementations, reference Figure 4 The thickness of the bushing 400 is less than the gap thickness between the motor stator 301 and the central shaft 100; the first bearing 500 is located on the outer periphery of the motor rotor 302 and the bushing 400.

[0057] In this embodiment, the thickness of the bushing 400 is less than the gap thickness between the motor stator 301 and the central shaft 100. This design structure allows the bushing 400 to penetrate deep into the motor stator 301 or the frame 800, so that the bushing 400 can have a larger range of movement.

[0058] In some implementations, the first bearing 500 is a roller bearing.

[0059] 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.

[0060] In some implementations, reference Figure 5 The direct-drive crank mechanism also includes:

[0061] The display unit 1020 is mounted on the frame 800 and is electrically connected to the electronic control module 1010.

[0062] In this embodiment, by providing a display unit 1020 on the frame 800, 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.

[0063] In some implementations, reference Figure 5 The direct-drive crank mechanism also includes:

[0064] The position detection unit 1030 is electrically connected to the electronic control module 1010 and is used to obtain the position of the crankset 200 on the central axis 100.

[0065] In this embodiment, the current position of the chainring 200 can be directly determined by setting the position detection unit 1030, which makes it easier for the electronic control module 1010 to adaptively adjust the position of the chainring 200 according to the current gear information of the freewheel 900. Usually, the chainring 200 will correspond as closely as possible to the gear corresponding to the current gear of the freewheel 900 to reduce the tilt angle of the chain.

[0066] The aforementioned position detection unit 1030 can be configured in various ways. For example, a laser radar mounted on the frame 800 can be used to detect the distance between the frame 800 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.

[0067] In some embodiments, the position detection unit 1030 includes a displacement sensor electrically connected to the electronic control module 1010, the displacement sensor being used to detect the movement distance of the motor rotor 302.

[0068] 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 1030.

[0069] 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 700 for the displacement sensor to transmit data.

[0070] In some implementations, reference Figure 5 The direct-drive crank mechanism also includes:

[0071] The energy storage unit 1040 is used to provide power to the motor stator 301 and the electronic control module 1010.

[0072] In this embodiment, the energy storage unit 1040 is directly used as the power source, such as a lithium battery or other storage battery, which can effectively improve the user experience, as the user no longer needs to connect an external power source for power supply.

[0073] In some implementations, the motor stator 301 and the electronic control module 1010 can be powered by a mobile power supply.

[0074] In some implementations, reference Figure 5 The direct-drive crank mechanism also includes:

[0075] The wireless communication module 1050 is electrically connected to the electronic control module 1010.

[0076] The aforementioned wireless communication module 1050 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 1050. It can also upload the operating data collected by the other bicycle electronic control modules 1010 to the cloud for storage and recording, so as to provide users with more in-depth services in the future.

[0077] The aforementioned wireless communication module 1050 can be a Bluetooth, WIFI, or other wireless communication module 1050. The specific choice depends on the actual requirements.

[0078] In some implementations, reference Figure 4 The direct-drive crank mechanism also includes:

[0079] The assembly base 700 is mounted on the frame 800; the linear motor and the central shaft 100 are located inside the assembly base 700.

[0080] The aforementioned assembly base 700 can be detachably mounted on the frame 800. For example, the assembly base 700 can be snapped onto the frame 800 or mounted on the frame 800 by fasteners. The assembly base 700 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.

[0081] In this embodiment, the entire direct-drive crankset mechanism can be configured as an assembly structure, and the entire direct-drive crankset mechanism can be quickly installed and replaced through the assembly base 700, providing users with a better user experience.

[0082] In some implementations, reference Figure 4 The direct-drive crank mechanism also includes:

[0083] Second bearing 600; bottom axle 100 passes through second bearing 600; second bearing 600 is located between bottom axle 100 and frame 800, and is located on the side away from chainring 200; second bearing 600 is used to support the rotation of bottom axle 100.

[0084] In this embodiment, the rotational support of the central shaft 100 can be achieved by using the second bearing 600, and the second bearing 600 is set away from the toothed sprocket 200, which can also provide installation space for the motor stator 301 of the linear motor.

[0085] 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 second bearing 600 near the toothed plate 200.

[0086] Direct-drive crankset mechanisms also include:

[0087] The axial locking structure 601 is located on the side of the second bearing 600 away from the toothed disc 200.

[0088] 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 601 is provided on the outer peripheral wall of the central shaft 100, on the side of the second bearing 600 away from the bushing 400, to provide restriction on the second bearing 600 in another direction. Finally, the restriction on the axial movement of the central shaft 100 is completed.

[0089] The aforementioned axial locking structure 601 can be an axial locking nut. The outer peripheral wall of the end of the central shaft 100 away from the bushing 400 can be provided with external threads, and the axial locking nut is threadedly connected to the central shaft 100. Of course, the axial locking structure 601 can also be a locking ring. The outer peripheral wall of the end of the central shaft 100 away from the bushing 400 can be provided with a retaining ring, and the axial lock is engaged in the retaining ring.

[0090] In some implementations, reference Figure 4 A locking plug 602 is provided on the side of the second bearing 600 away from the toothed disc 200. The locking plug 602 is located on the outer periphery of the axial locking structure 601.

[0091] In this embodiment, the second bearing 600 can be fixed by using the locking plug 602.

[0092] In some implementations, reference Figure 4 When there is a gap between the locking screw plug 602 and the axial locking structure 601, a sealing ring 603 can be provided between the locking screw plug 602 and the axial locking structure 601.

[0093] In some implementations, reference Figure 4 On the assembly seat 700 or the frame 800, an end cover 501 can be provided on the side of the first bearing 500 away from the second bearing 600. The end cover 501 can be located on the outside of the motor rotor 302 to fix and seal the first bearing 500.

[0094] In some implementations, the end cap 501 can also be configured as an axial locking nut.

[0095] This application also provides a bicycle that includes the direct-drive chainring mechanism described above. Because the bicycle has a direct-drive chainring mechanism, it possesses all the beneficial effects of such a mechanism.

[0096] 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 crank mechanism, 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; 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; the motor stator is used to drive the motor rotor to move axially along the central shaft. A bushing is fitted onto the central shaft and fixedly connected to one end of the motor rotor; The toothed plate is fixedly connected to the end of the bushing away from the motor rotor; the toothed plate and / or the motor rotor and / or the bushing are connected to the central shaft drive. The electronic control module is electrically connected to the stator of the motor.

2. The direct-drive crank mechanism according to claim 1, characterized in that, Also includes: The first bearing is mounted on the frame and located on the side closest to the chainring; The first bearing is coaxially arranged with the motor rotor and the bushing, and the first bearing is located on the outer periphery of the motor rotor and / or the bushing.

3. The direct-drive crank mechanism according to claim 2, characterized in that, The thickness of the bushing is less than the gap thickness between the motor stator and the central shaft; the first bearing is located on the outer periphery of the motor rotor and the bushing.

4. The direct-drive crank mechanism according to claim 2, characterized in that, The first bearing is a roller bearing.

5. The direct-drive crank mechanism according to claim 1, characterized in that, Also includes: The display unit is mounted on the vehicle frame and is electrically connected to the electronic control module.

6. The direct-drive crank mechanism according to claim 1, characterized in that, 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.

7. The direct-drive crank mechanism 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.

8. The direct-drive crank mechanism according to claim 1, characterized in that, Also includes: The second bearing; the bottom bracket passes through the second bearing; the second bearing is located between the bottom bracket and the frame, and on the side away from the chainring; the second bearing is used to provide rotational support for the bottom bracket.

9. The direct-drive crank mechanism according to claim 8, characterized in that, A limiting protrusion is provided on the outer peripheral wall of the central shaft, and on the side of the second bearing near the toothed disc; The direct-drive crank mechanism also includes: An axial locking structure is located on the side of the second bearing away from the toothed disc.

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

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