Transmission device for power-assisted bicycle driving unit, driving unit and power-assisted bicycle

Abstract

The invention belongs to the technical field of power-assisted bicycles, and discloses a transmission device for a power-assisted bicycle driving unit, the driving unit and a power-assisted bicycle. The transmission device for the power-assisted bicycle driving unit further comprises a holder module, the holder module comprises a holder body, a first magnetic assembly and a second magnetic assembly, the transmission assembly and the first magnetic assembly are both installed on the holder body, and the first magnetic assembly and the second magnetic assembly generate adjusting torque. The adjusting torque adjusts the position of the transmission assembly located on the holder body relative to the driving piece. The rotating torque of the driven part is not transmitted to the driving part, so that the driving part does not move relative to the output gear meshed with the driving part, namely the driving part does not collide with the output gear meshed with the driving part. Therefore, power output of the driving unit can be achieved, gear collision in the riding process is avoided, and the riding experience feeling is improved.

Description

Technical Field

[0001] This invention relates to the field of power-assisted bicycle technology, and more particularly to a transmission device for a power-assisted bicycle drive unit, a drive unit, and a power-assisted bicycle. Background Technology

[0002] A transmission device is a device that transmits torque. In existing power-assisted bicycle drive units, the transmission device achieves its disengagement and engagement states through the relative rotation between the inner and outer rings. The transmission device itself does not have an additional mechanism to control the working position of the wedge or roller transmission device. However, existing transmission devices only have unidirectional disengagement and engagement states, and their function is limited. In some specific mechanical applications, the transmission device needs to have both unidirectional engagement and multidirectional disengagement capabilities. For example, in the case of an electric bicycle, during riding, in manual mode, the rider's feet drive the pedals, which in turn rotate the crankshaft via the crank. The transmission device connected to the crankshaft is in an engaged state, allowing the crankshaft to drive the chainring and propel the bicycle forward. At this time, the transmission device connected to the electric bicycle's drive unit is in a disengaged state. However, due to the unavoidable frictional torque between the transmission device connected to the transmission mechanism and the output gear of the transmission mechanism, the rotation of the crankshaft can still drive the output gear of the transmission mechanism through the transmission device connected to the transmission mechanism. The rotation of the output gear will collide with the gear that meshes with it, such as the output gear colliding with the intermediate gear, thus generating gear collision noise during riding and affecting the riding experience.

[0003] Therefore, there is an urgent need for a transmission device, a drive unit, and an electric bicycle for power-assisted bicycles to solve the above problems. Summary of the Invention

[0004] This invention provides a transmission device, a drive unit, and an electric bicycle for a power-assisted bicycle drive unit, which avoids collision between the driving component of the transmission device and the corresponding output gear at the power output end, reduces noise, and improves the riding experience.

[0005] Based on the above concept, the technical solution adopted by this invention is as follows:

[0006] A transmission device for a power-assisted bicycle drive unit includes a driving member, a transmission assembly, and a driven member. The driving member is used to connect to a power input end, and the driven member is used to connect to a power output end. The transmission assembly is located between the driving member and the driven member. The transmission device also includes a cage module, which includes a cage body, a first magnetic component, and a second magnetic component. The transmission assembly and the first magnetic component are both mounted on the cage body. The second magnetic component is at least partially opposite to the first magnetic component, and the second magnetic component is stationary relative to the housing of the drive unit.

[0007] The first magnetic component and the second magnetic component generate an adjusting torque, which is used to adjust the position of the transmission component relative to the driving component.

[0008] Furthermore, the adjusting torque for adjusting the position of the transmission assembly relative to the driving member includes:

[0009] The adjusting torque is used to adjust the position of the cage body relative to the driving member, thereby adjusting the position of the transmission assembly relative to the driving member.

[0010] Furthermore, when the driving member (1) rotates in the first direction, the adjusting torque is used to adjust the transmission assembly into the wedge position of the transmission device.

[0011] Furthermore, the transmission assembly includes a transmission element, and the adjusting torque is greater than the frictional torque between the transmission element and the driving element.

[0012] Furthermore, when the driven member rotates in the second direction, the adjusting torque is used to prevent the transmission assembly from entering the wedge-tight position of the transmission device, and the first direction is opposite to the second direction.

[0013] Furthermore, the transmission assembly includes a transmission element, and the adjusting torque is greater than the frictional torque between the transmission element and the driven element.

[0014] Furthermore, at least one of the first magnetic component and the second magnetic component includes a non-uniform magnetic field.

[0015] Furthermore, the magnetic direction of the first magnetic component is opposite to that of the second magnetic component.

[0016] Furthermore, the first magnetic component includes a plurality of alternating first magnets, wherein adjacent first magnets in the first magnetic component have opposite magnetic directions; the second magnetic component includes a plurality of alternating second magnets, wherein adjacent second magnets in the second magnetic component have opposite magnetic directions.

[0017] Furthermore, the number of first magnets in the first magnetic component and the number of second magnets in the second magnetic component are the same, and the distance between adjacent first magnets in the first magnetic component is equal to the distance between adjacent second magnets in the second magnetic component.

[0018] Furthermore, both the first magnetic component and the second magnetic assembly include at least one annular magnet, and the first magnetic component and the second magnetic component are arranged axially symmetrically.

[0019] Furthermore, the first magnetic component includes at least one first magnet, and the second magnetic component includes a magnetic disk, wherein the magnetic disk is provided with at least one protrusion corresponding to the first magnet, and the protrusion is disposed on one side of the magnetic disk along the circumference of the magnetic disk.

[0020] Furthermore, multiple second magnetic components are provided, and they are respectively disposed on both sides of the first magnetic component.

[0021] Furthermore, the first magnetic component and the second magnetic component are arranged axially opposite each other, or the first magnetic component and the second magnetic component are arranged radially opposite each other.

[0022] Furthermore, the second magnetic component includes an energized coil.

[0023] Furthermore, the active component is provided with multiple wedge-shaped grooves, and the transmission assembly includes multiple transmission components that are arranged one-to-one with the wedge-shaped grooves. The transmission components are capable of moving in the wedge-tightening direction or in the loosening direction.

[0024] Furthermore, when the transmission component is a roller;

[0025] When the driving member rotates in the first direction, the adjusting torque is used to adjust the movement of the transmission member toward the narrow end of the wedge groove of the driving member. The transmission device is in a wedge-engaged state, and the driving member can drive the driven member to rotate.

[0026] When the driven member rotates in the second direction, the adjusting torque is used to adjust the movement of the transmission member toward the wide end of the wedge groove of the driving member. The transmission device is in a released state, and the driving member and the driven member are in a state of disengagement.

[0027] Furthermore, when the transmission component is a wedge;

[0028] When the driving member rotates in the first direction, the adjusting torque is used to adjust the rotation of the transmission member to the narrow end of the wedge groove of the driving member, the transmission device of the power-assisted bicycle drive unit is in a one-way wedge engagement state, and the driving member can drive the driven member to rotate.

[0029] When the driven member rotates in the second direction, the adjusting torque is used to adjust the movement of one end of the transmission member toward the wide end of the wedge groove of the driving member. The transmission device of the power-assisted bicycle drive unit is in a released state, and the driving member and the driven member are in a state of disengagement.

[0030] Furthermore, one end of the cage body is provided with a plurality of first mounting slots along its circumference, and the plurality of first mounting slots are provided in a one-to-one correspondence with the plurality of transmission components, and the transmission components are installed in the corresponding first mounting slots.

[0031] Furthermore, a second mounting groove is uniformly provided at the other end of the main body of the retainer along its circumference, and the first magnetic component is installed in the second mounting groove.

[0032] Furthermore, the second magnetic component is disposed in the housing of the drive unit.

[0033] The drive unit includes the transmission device for the power-assisted bicycle drive unit.

[0034] A power-assisted bicycle, including the drive unit.

[0035] The beneficial effects of this invention are:

[0036] This invention provides a transmission device for a power-assisted bicycle drive unit. The transmission device includes a driving member, a transmission assembly, and a driven member. The driving member connects to the power input end, the driven member connects to the power output end, and the transmission assembly is located between the driving member and the driven member. The transmission device also includes a cage module, which includes a cage body, a first magnetic assembly, and a second magnetic assembly. The transmission assembly and the first magnetic assembly are both mounted on the cage body. The second magnetic assembly is at least partially opposite to the first magnetic assembly and is stationary relative to the drive unit's housing. The first and second magnetic assemblies generate an adjusting torque, which is used to adjust the position of the transmission assembly located on the cage body relative to the driving member. In this invention, when the drive unit outputs power, the driving member rotates, and the adjusting torque adjusts the position of the transmission assembly relative to the driving member, causing the transmission assembly to enter the wedged position of the transmission device, thus providing power assistance to the power-assisted bicycle. When the drive unit does not output power, regardless of whether the driven member of the drive unit rotates in a first direction or moves in a second direction opposite to the first direction, the adjusting torque prevents the transmission assembly from entering the wedged position of the transmission device, and the transmission device is in a released state. Therefore, the torque of the driven member is not transmitted to the driving member, causing the driving member to not move relative to its meshing output gear, i.e., the driving member does not collide with its meshing output gear. Therefore, the embodiment of this application can both realize the power assist output of the drive unit and avoid gear collision during riding, thus improving the riding experience.

[0037] The present invention also provides a drive unit, including the transmission device for the above-mentioned power-assisted bicycle drive unit, which realizes the power-assisted output of the drive unit and avoids gear collision during riding, thereby improving the riding experience.

[0038] The present invention also provides an electric bicycle, which includes the aforementioned drive unit, to prevent the output gear from colliding with the gear that meshes with the output gear during riding, thereby avoiding gear collision noise during riding and improving the riding experience. Attached Figure Description

[0039] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of the present invention and these drawings without creative effort.

[0040] Figure 1 This is a schematic diagram of the structure of the electric bicycle provided in an embodiment of the present invention;

[0041] Figure 2 This is a schematic diagram of the structure of the driver unit provided in an embodiment of the present invention;

[0042] Figure 3 This is a schematic diagram of the structure of the transmission device for the power-assisted bicycle drive unit provided in an embodiment of the present invention;

[0043] Figure 4 This is a cross-sectional view of a transmission device for a power-assisted bicycle drive unit provided in an embodiment of the present invention;

[0044] Figure 5 This is a schematic diagram of the cage module provided in an embodiment of the present invention;

[0045] Figure 6 This is a schematic diagram of the structure of the second magnetic component provided in this embodiment of the invention, which includes a plurality of alternately arranged second magnets installed in the housing;

[0046] Figure 7 This is a schematic diagram of the cage module and the outer shell provided in an embodiment of the present invention;

[0047] Figure 8 This is a schematic diagram of the structure of the second magnetic component provided in an embodiment of the present invention, which includes a magnetic disk structure and bumps;

[0048] Figure 9 This is a schematic diagram of the structure of the transmission assembly and the main body of the cage when the transmission assembly includes multiple wedges, as provided in the embodiments of the present invention;

[0049] Figure 10 This is a schematic diagram of the cage body when the transmission assembly provided in this embodiment of the invention includes multiple wedges;

[0050] Figure 11This is a schematic diagram of the structure of the active component provided in an embodiment of the present invention;

[0051] Figure 12 This is a schematic diagram of the transmission device for the power-assisted bicycle drive unit in a wedge-engaged state, provided in an embodiment of the present invention.

[0052] Figure 13 This is a schematic diagram of the transmission device for the power-assisted bicycle drive unit in the released state, provided in an embodiment of the present invention.

[0053] In the picture:

[0054] 1. Driving component; 11. Wedge groove; 111. Wide end; 112. Narrow end; 2. Transmission assembly; 3. Driven component; 4. Cage body; 41. First mounting slot; 5. First magnetic assembly; 6. Second magnetic assembly; 61. Magnetic disk; 62. Protrusion; 7. Housing; 71. Third mounting slot; 10. Transmission device; 100. Frame; 200. Wheel; 300. Pedal; 400. Crank; 500. Chainring assembly; 600. Drive chain; 700. Drive unit; 701. Motor; 702. Transmission mechanism; 703. Output gear. Detailed Implementation

[0055] To make the technical problems solved by the present invention, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely for explaining the present invention and are not intended to limit the present invention. Furthermore, it should be noted that, for ease of description, only the parts related to the present invention are shown in the accompanying drawings, not all of them.

[0056] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0057] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0058] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature. In the description of this embodiment, unless otherwise specified, "multiple" specifically refers to two or more.

[0059] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0060] It should be noted that when a component is referred to as "fixed to" or "set on" another component, it can be directly on the other component or it can be located in between the component.

[0061] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0062] refer to Figure 1 The illustration shows a mid-mounted electric bicycle, where the drive unit 700 is positioned in the middle. The electric bicycle provided in this embodiment mainly comprises a frame 100, wheels 200, pedals 300, cranks 400, chainring 500, a drive chain 600, and the electric bicycle drive unit 700. The electric bicycle drive unit 700 is mounted on the frame 100. The pedals 300 are connected to the chainring 500 via the cranks 400, and the chainring 500 is connected to the wheels 200 via the drive chain 600. This electric bicycle typically has two riding modes: manual mode and assisted mode. In manual mode, the electric bicycle drive unit 700 is off, and the vehicle's power comes entirely from the rider pedaling the pedals 300. The power is then transmitted to the wheels 200 via the crank 400 and drive bar 600, thus propelling the vehicle forward. In assisted mode, the electric bicycle drive unit 10 is on. The drive unit 10 can output different amounts of power depending on the rider's pedaling force, and transmits the power to the wheels 200 via the chainring 500 and drive bar 600, thus providing assistance.

[0063] During riding, the rider's feet drive the pedals 300, which in turn rotate the crankshaft via the crank 400. The crankshaft then drives the chainring 500 to propel the bicycle forward. At this time, the transmission device 10 connected to the power output end of the bicycle's drive unit 700 is in a disengaged state. However, due to the frictional torque between the driving element 1 and the transmission assembly 2 of the transmission device 10, the rotation of the crankshaft causes the transmission device 10 to wedge. Consequently, the driving element 1 collides with the output gear at the power output end, generating noise and affecting the riding experience.

[0064] Based on the above problems, this embodiment provides a transmission device for a power-assisted bicycle drive unit, referred to as transmission device 10, which avoids the knocking between the driving component 1 of transmission device 10 and the output gear 703 at the power output end, and does not generate gear collision noise during riding, thus improving the riding experience.

[0065] like Figure 2 As shown, the output gear 703 at the power output end of the transmission mechanism 702 of the drive unit 700 meshes with the driving member 1. In the power assist mode, the motor 701 of the drive unit 700 outputs power, and the driving member 1 of the transmission device 10 of the drive unit 700 is connected to the output gear 703 at the power output end of the motor 701 to realize the power assist of the drive unit 700.

[0066] In this embodiment, as Figures 3-13 As shown, the transmission device 10 includes a driving member 1, a transmission assembly 2, and a driven member 3. The driving member 1 is used to connect to the power input end, and the driven member 3 is used to connect to the power output end. The transmission assembly 2 is located between the driving member 1 and the driven member 3. It can be understood that the driving member 1, used to connect to the power input end, can be an output gear 703 connected to the output shaft of the motor 701 of the drive unit 700, or an output gear 703 connected to the output shaft of the motor 701 via a reduction mechanism. The driven member 3 is used to connect to the power output end, which can be a chainring spline sleeve connected to the chainring. Alternatively, the power output end can be connected to the chainring after multiple stages of transmission.

[0067] It is understood that the transmission device 10 provided in this embodiment can be an overrunning clutch.

[0068] The transmission device 10 provided in this embodiment also includes a cage module, which includes a cage body 4, a first magnetic component 5, and a second magnetic component 6. The transmission component 2 and the first magnetic component 5 are both mounted on the cage body 4. The second magnetic component 6 is at least partially opposite to the first magnetic component 5 and is stationary relative to the housing 7 of the drive unit 700. The first magnetic component 5 and the second magnetic component 6 generate an adjusting torque, which is used to adjust the position of the transmission component 2 located on the cage body 4 relative to the driving member 1. In this embodiment, the second magnetic component 6 is at least partially opposite to the first magnetic component 5, which allows the first magnetic component 5 and the second magnetic component 6 to generate an adjusting torque, which is used to adjust the position of the transmission component 2 located on the cage body 4 relative to the driving member 1. In this embodiment, when the drive unit outputs power, the driving member 1 rotates, and the adjusting torque adjusts the position of the transmission component 2 relative to the driving member 1, causing the transmission component 2 to enter the wedged position of the transmission device 10, thereby providing power assistance to the bicycle. When the drive unit 700 is not outputting power, regardless of whether the driven member 3 of the drive unit 700 rotates in the first direction or moves in the second direction opposite to the first direction, the adjusting torque prevents the transmission component 2 from entering the wedged position of the transmission device 10, and the transmission device 10 is in a released state. Therefore, the rotational torque of the driven member 3 will not be transmitted to the driving member 1, causing the driving member 1 to move relative to the output gear 703 that is not meshed with it, that is, the driving member 1 will collide with the output gear 703 that is not meshed with it. Therefore, the embodiment of this application can realize the power assist output of the drive unit while avoiding gear collision during riding, thus improving the riding experience.

[0069] Furthermore, such as Figure 1 and Figure 5 As shown, the second magnetic component 6 is stationary relative to the housing 7 of the driving unit 700, which means that the second magnetic component 6 is disposed on the housing 7 of the driving unit 700. Of course, the second magnetic component 6 can also be disposed outside the housing 7, which is not limited here. In this embodiment, the second magnetic component 6 is disposed on the housing 7 of the driving unit 700, which can be achieved by forming at least one third mounting groove 71 on the side of the housing 7 opposite to the transmission device 10. The shape of the third mounting groove 71 can be set according to the structure of the second magnetic component 6, such as a circular groove, which is not limited here. Of course, in other embodiments, the second magnetic component 6 can also be disposed on the housing 7 of the driving unit 700 by bonding. The specific installation method can be determined according to actual needs, and this embodiment does not make a specific limitation.

[0070] Furthermore, it is conceivable that the adjusting torque generated by the first magnetic component 5 relative to the second magnetic component 6 can be achieved through the principle of minimum magnetic resistance. For example, the first magnetic component 5 and the second magnetic component 6 are set to be deflected and misaligned. In this case, the second magnetic component 6 will generate a circumferential torque on the first magnetic component 5, which is the adjusting torque provided in this embodiment. Since the first magnetic component 5 is disposed on the cage body 4, this adjusting torque can adjust the position of the transmission component 2 relative to the driving component 1.

[0071] It should be noted that the adjusting torque used to adjust the position of the transmission component 2 relative to the driving member 1 can mean that when the driving member 1 rotates with the power output end, the transmission component 2 does not rotate due to the resistance of the adjusting torque, and the transmission component 2 moves relative to the driving member 1. This relative movement causes the transmission component 2 to enter the wedge-tight position of the driving member 2 of the transmission device 10, thereby realizing the transmission of power torque. In another embodiment, the adjusting torque used to adjust the position of the transmission component 2 relative to the driving member 1 can also mean that when the driven member 3 rotates in the second direction, there is frictional resistance between the transmission component 2 and the driven member 3. Due to the existence of the adjusting torque, which is greater than the frictional torque between the driven member 3 and the transmission component 2, the adjusting torque overcomes the frictional torque, and the transmission component 2 does not enter the wedge-tight position of the driving member 2 of the transmission device 10.

[0072] Furthermore, the first magnetic component 5 generates an adjusting torque relative to the second magnetic component 6. This torque can be attributed to Faraday's law of electromagnetic induction. When the driving component 1 rotates, the second magnetic component 6 generates an induced electromotive force when cutting the magnetic field lines emitted by the first magnetic component 5. Under the influence of the constantly changing magnetic field, the second magnetic component 6 generates vortex-shaped induced currents, i.e., eddy currents. These eddy currents are themselves currents, and they are located within the magnetic field of the first magnetic component 5. According to Ampere's law (F=BIL), the magnetic field exerts a force on the current-carrying second magnetic component 6. According to Lenz's law, the direction of this force always opposes the relative motion that induces the current. The reaction force of this force acting on the second magnetic component 6 acts on the first magnetic component 5, manifesting as a resisting torque opposite to the rotation direction of the first magnetic component 5. In other words, the interaction between the second magnetic component 6 and the first magnetic component 5 generates a torque on the first magnetic component 5 that opposes its movement, thereby adjusting the position of the cage body 4 containing the first magnetic component 5 relative to the driving component 1, i.e., the position of the transmission component 2 relative to the driving component 1.

[0073] Furthermore, it is conceivable that the positions of the first magnetic component 5 and the second magnetic component 6 can be interchanged, depending on actual usage requirements. Further, the adjusting torque used to adjust the position of the transmission component 2 relative to the driving member 1 on the cage body 4 includes adjusting the position of the cage body 4 relative to the driving member 1, thereby adjusting the position of the transmission component 2 relative to the driving member 1. It is understood that both the transmission component 2 and the first magnetic component 5 are mounted on the cage body 4. When the first magnetic component 5 on the cage body 4 rotates, it generates an adjusting torque, which is used to adjust the position of the transmission component 2 relative to the driving member 1 on the cage body 4.

[0074] In this embodiment, when the driving member 1 rotates in the first direction, the adjusting torque is used to adjust the transmission assembly 2 into the wedge position of the transmission device 10.

[0075] Understandably, when the power-assisted bicycle drive unit 700 outputs power, it drives the active component 1 to rotate. When the active component 1 rotates in the first direction, the first magnetic component 5 and the second magnetic component 6 generate an adjusting torque. The adjusting torque is greater than the frictional torque generated by the rotation of the active component 1 on the cage body 4, so the cage body 4 rotates insufficiently, the transmission component 2 moves in the wedging direction, and the transmission device 10 is in a wedging state.

[0076] Furthermore, when the driven member 3 rotates in the second direction, the adjusting torque is used to adjust the transmission assembly 2 so that it does not enter the wedge-tight position of the transmission device 10, and the first direction is opposite to the second direction.

[0077] It is understandable that when the driven member 3 rotates in the second direction, the adjusting torque is greater than the frictional torque generated by the rotation of the driven member 4 on the cage body 4. The cage body 4 rotates insufficiently, and the transmission assembly 2 does not enter the wedging position of the transmission device 10. The transmission device 10 is in an overrunning state. Furthermore, when the transmission device 10 rotates in the first direction, it is in an unwedged state, meaning the transmission assembly 2 moves in the releasing direction, and the transmission device 10 is in a released state. In other words, it is in an overrunning state, thus realizing the bidirectional overrunning function of the transmission device 10. In this embodiment, the first direction is clockwise, and the second direction is counterclockwise.

[0078] The transmission assembly 2 includes a transmission element 21, and the adjusting torque is greater than the frictional torque between the transmission element 21 and the driving element 1. Specifically, the transmission assembly 2 includes multiple transmission elements 21. The specific number of transmission elements 21 can be determined according to actual usage requirements.

[0079] In this embodiment, the driving member 1 is provided with a plurality of wedge-shaped grooves 11, and the transmission assembly 2 includes a plurality of transmission members 21 corresponding one-to-one with the wedge-shaped grooves 11. The transmission members 21 are capable of entering the wedge-tightening position of the transmission device 10 or not entering the wedge-tightening position of the transmission device 10. Figure 11 As shown, multiple wedge-shaped grooves 11 are formed on the inner side of the driving member 1. Under different motion states, the relative positions of the transmission component 2 and the driving member 1 are different; in other words, the relative positions of the transmission component 21 and its corresponding wedge-shaped groove 11 are different. The wedge-shaped groove 11 has a narrow end 112 and a wide end 111. The "narrow end 112" of the wedge-shaped groove 11 can be understood as the "outer side," referring to the wedge-tightening area when the transmission component 21 moves in the wedge-tightening direction and contacts the driving member 1. The "wide end 111" of the wedge-shaped groove 11 refers to the free state area when the transmission component 21 moves in the loosening direction and does not wedge-tightly contact the driving member 1.

[0080] It should be noted that the transmission device 10 can be a roller clutch or a wedge clutch, that is, the transmission assembly 2 can include multiple rollers or multiple wedges, that is, the transmission component 21 can be rollers or wedges. The specific type can be determined according to the actual use requirements, and this embodiment does not make specific limitations.

[0081] For example, such as Figure 12 As shown, when the active member 1 rotates in the first direction, the power-assisted bicycle drive unit 700 is in power-assisted mode. The motor 701 can drive the power output shaft in the drive unit 700 to move, thereby driving the active member 1 to rotate. The transmission member 21 is pressed into and abuts against the narrow end 112 of the wedge-shaped groove of the active member 1. The transmission assembly 2 and the active member 1 are in a wedge-engaged state, and the transmission device 10 is in a wedge-engaged state. The active member 1 can drive the driven member 3 to rotate. That is, when the active member 1 rotates in the first direction, the hysteresis three-state transmission device 10 operates normally. When the active member 1 drives the driven member 3 to rotate in the positive direction, the adjusting torque applied by the second magnetic assembly 6 to the first magnetic assembly 5 is greater than the frictional torque generated by the rotation of the active member 1 on the cage body 4. The cage body 4 does not rotate relative to the active member 11, and the transmission member 21 is pressed into the narrow end 112 of the wedge-shaped groove of the active member 1.

[0082] For example, such as Figure 13 As shown, when the driving member 1 rotates in the second direction, the transmission member 21 is pressed into the wide end 111 of the wedge-shaped groove of the driving member 1. The transmission member 21 is not in contact with the driving member 1, and the transmission device 10 is in an overrunning state. The driving member 1 and the driven member 3 are in a state of disengagement. It can be understood that when the driving member 1 rotates in the second direction, the transmission member 21 enters the wide end 111 of the wedge-shaped groove 11, and the driving member 1 and the driven member 3 are in a disengaged state.

[0083] For example, when the driven member 3 rotates in the first direction, the transmission member 21 is located at the wide end 111 of the wedge groove of the driving member 1, the transmission device 10 is in an overrunning state, and the driving member 1 and the driven member 3 are in a disengaged state. It can be understood that when the driven member 3 rotates in the first direction, the adjusting torque applied by the second magnetic component 6 to the first magnetic component 5 is greater than the frictional torque generated by the rotation of the driving member 1 on the cage body 4, so the cage body 4 cannot rotate, the transmission member 21 is located at the wide end 111 of the wedge groove 11 of the driving member 1, and the driving member 1 and the driven member 3 are in a disengaged state.

[0084] For example, when the driven member 3 rotates in the second direction, the transmission member 21 is located at the wide end 111 of the wedge groove 11 of the driving member 1, the transmission device 10 is in an overrunning state, and the driving member 1 and the driven member 3 are in a disengaged state. It can be understood that when the driven member 3 rotates in the second direction, the driven member 3 contacts and rubs against the transmission member 21, causing the cage body 4 and the first magnetic component 5 to rotate. During the rotation, the magnetic field of the second magnetic component 6 interacts with the magnetic field of the first magnetic component 5 to form a braking torque that hinders the relative motion, i.e., the adjusting torque. The adjusting torque is greater than the frictional torque generated by the rotation of the driven member 3 on the cage body 4, so the rotation of the cage body 4 is hindered, the transmission member 21 is located at the wide end 111 of the wedge groove 11, the transmission device 10 is in an overrunning state, and the driving member 1 does not rotate.

[0085] In this embodiment, as Figures 4-5 As shown, a plurality of first mounting slots 41 are evenly arranged along the circumference of the cage body 4. Each of the first mounting slots 41 corresponds to a plurality of transmission components 21, and the transmission components 21 are installed within their respective first mounting slots 41. Specifically, the plurality of first mounting slots 41 are located at one end of the cage body 4, and the first magnetic component 5 is installed at the other end of the cage body 4. In this embodiment, to meet the installation requirements of the first magnetic component 5, a second mounting slot is provided at the other end of the cage body 4 for installing the first magnetic component 5. The specific structure and number of the second mounting slots at the other end of the cage body 4 can be determined according to actual usage requirements, and will not be elaborated further in this embodiment.

[0086] In this embodiment, as Figure 4 and Figure 7 As shown, the first mounting groove 41 is a groove with three open ends, which facilitates the movement of the transmission component 21 and allows the transmission device 10 to switch between the loosened state and the wedge-engaged state.

[0087] In this embodiment, the above-described configuration achieves the functions of unidirectional wedging and bidirectional overtaking of the transmission device 10, providing three states. The first magnetic component 5 and the second magnetic component 6 work together to achieve frictionless braking, eliminating noise, wear, and pollution. In this embodiment, as... Figures 4-7 As shown, the first magnetic component 5 and the second magnetic component 6 can be arranged coaxially or nearly coaxially.

[0088] Furthermore, at least one of the first magnetic component 5 and the second magnetic component 6 includes a non-uniform magnetic field. It is understood that the magnetic field generated by at least one of the first magnetic component 5 and the second magnetic component 6 is not uniformly distributed, providing a strong magnetic force at certain locations and a weaker magnetic force or even a repulsive force at others. In this embodiment, the non-uniform magnetic field design ensures that in the wedge-tightening direction, the magnetic field strength is high, and the magnetic force reliably attracts and holds the transmission component 21 at the narrow end 112 of the wedge groove 11, ensuring that power transmission does not slip. In the release direction, the magnetic field strength is weak or is guided away, allowing the transmission component 21 to easily overcome the magnetic force and return to the wide end 111 of the wedge groove 11 when separation is required, achieving near-zero resistance overtaking and thus completely eliminating gear drag noise.

[0089] For example, the magnetic direction of the first magnetic component 5 is opposite to that of the second magnetic component 6. Specifically, the first magnetic component 5 and the second magnetic component 6 are arranged symmetrically along their axes. For instance, one side of the first magnetic component 5 is the N pole and the other side is the S pole, and one side of the second magnetic component 6 is the S pole and the other side is the N pole. One side of the first magnetic component 5 is opposite to one side of the second magnetic component 6, forming two magnetic components that attract each other face-to-face, thus generating a tendency to move closer to each other. The first magnetic component 5 and the second magnetic component 6 can be permanent magnetic elements.

[0090] In this embodiment, both the first magnetic component 5 and the second magnetic component 6 include multiple magnets, and the braking torque generated varies periodically with a period of 360° / number of magnetic poles; the period of torque fluctuation can be reduced by increasing the number of magnetic poles.

[0091] For example, the first magnetic component 5 includes a plurality of alternating first magnets, with adjacent first magnets in the first magnetic component 5 having opposite magnetic directions; the second magnetic component 6 includes a plurality of alternating second magnets, with adjacent second magnets in the second magnetic component 6 having opposite magnetic directions, making the magnetic fields of the first magnetic component 5 and the second magnetic component 6 more concentrated and stronger. Both the plurality of first magnets and the plurality of second magnets can be configured as a Hellbeck array or a similar structure to further increase the magnetic field strength. It is understood that because the first magnetic component 5 includes a plurality of alternating first magnets, and the second magnetic component 6 includes a plurality of alternating second magnets, and adjacent magnets have opposite magnetic directions (e.g., opposite ends of adjacent magnets are N poles and S poles respectively), the torque generated when the first magnetic component 5 rotates relative to the second magnetic component 6 has a periodic change. The period is 360° / (number of magnetic poles / 2), or the period is 360° / number of magnetic pole pairs; that is, increasing the number of magnetic poles can reduce the period of braking torque fluctuation. In this embodiment, the first magnetic component 5 includes a single alternating first magnet, and the second magnetic component 6 includes a single alternating plurality of second magnets.

[0092] Of course, it is conceivable that other arrangements can be used in some optional embodiments. For example, the first magnetic component 5 includes a plurality of first magnets arranged in alternating pairs, and the second magnetic component 6 includes a plurality of second magnets arranged in alternating pairs. That is, among the plurality of first magnets in the first magnetic component 5, there are at least two first magnets with opposite magnetic directions among the first magnets with the same magnetic direction, and among the plurality of second magnets in the second magnetic component 6, there are at least two first magnets with opposite magnetic directions among the second magnets with the same magnetic direction. Or more, for example, the first magnetic component 5 includes a plurality of first magnets arranged in alternating three-three arrangements, and the second magnetic component 6 includes a plurality of second magnets arranged in alternating three-three arrangements.

[0093] Furthermore, the number of magnets in the first magnetic component 5 and the number of magnets in the second magnetic component 6 are the same, and the distance between adjacent magnets in the first magnetic component 5 is equal to the distance between adjacent magnets in the second magnetic component 6. This further improves the stability of the magnetic field generated by the first magnetic component 5 and the second magnetic component 6, and reduces the occurrence of misalignment. In this embodiment, multiple second magnetic components 6 can be provided, and the multiple second magnetic components 6 can be respectively provided on both sides of the first magnetic component 5.

[0094] As another example, both the first magnetic component 5 and the second magnetic component 6 may include at least one annular magnet.

[0095] For example, such as Figure 8As shown, the first magnetic component 5 includes at least one first magnet, and the second magnetic component 6 includes a magnetic disk. The magnetic disk 61 has at least one protrusion 62 corresponding to the first magnet, and the protrusion 62 is arranged circumferentially on one side of the magnetic disk 61. In this embodiment, multiple first magnets and protrusions are correspondingly arranged, with the multiple first magnets radially symmetrically arranged and the multiple protrusions 62 also radially symmetrically arranged. It can be understood that by setting multiple magnetic disks 61 and protrusions 62, each protrusion 62 becomes a highly efficient, independent "miniature brake." The braking torque generated by the multiple protrusions 62 is superimposed, resulting in a total braking torque far greater than that of a smooth magnetic disk 61 of the same size, with more concentrated energy, less loss, and a stronger braking effect. Furthermore, the structure of the protrusion 62 greatly increases the surface area of ​​the protrusion in contact with air, acting like a heat sink, significantly improving heat dissipation efficiency. This arrangement allows the transmission device 10 to operate at higher power and for longer periods without overheating, improving the reliability and lifespan of the device. In this embodiment, the protrusion 62 can be processed from the magnet 61 to obtain a non-conductor, integrally formed with the magnet 61. Of course, in other embodiments, the bump 62 and the magnetic disk 61 can be separate structures, and the bump 62 can be a conductor, connected to the magnetic disk 61 by means of bonding or other methods.

[0096] In this embodiment, multiple second magnetic components 6 can be provided, respectively disposed on both sides of the first magnetic component 5, to counteract the axial force generated on the first magnetic component 5, making the cage body 4 more stable. Of course, in this embodiment, each second magnetic component 6 is also a radial double magnet without axial force. A radial double magnet is a specially designed magnet combination structure in which the magnetization directions of the two magnets are distributed radially (i.e., the magnetic field direction is perpendicular to the axis), and they are usually arranged symmetrically or complementaryly to enhance the magnetic field in a specific direction. The specific structure of the radial double magnet is prior art and will not be described in detail in this embodiment.

[0097] It is conceivable that, in this embodiment, the first magnetic component 5 and the second magnetic component 6 are arranged axially opposite each other, or the first magnetic component 5 and the second magnetic component 6 are arranged radially opposite each other.

[0098] Furthermore, the bumps can be made of materials such as electrical pure iron or silicon steel, and the magnetic disk can be made of soft magnetic material, which attracts the magnet after being magnetized.

[0099] For example, the second magnetic component 6 includes an energized coil. Specifically, the second magnetic component 6 is an energized coil with an iron core, and its effect after being energized is equivalent to that of a permanent magnet. It can be understood that by setting the second magnetic component 6 as an energized coil with an iron core, the originally fixed permanent magnet component is replaced by an electromagnet that can be controlled by current. The generated magnetic field strength is proportional to the coil current I. By applying different currents to the energized coil, the magnetic field changes can be controlled, enabling active control of the magnetic field strength. This facilitates determining the specific magnetic field strength according to actual usage requirements, further improving adaptability.

[0100] In this embodiment, all magnets feature a flattened design. Flattened magnets allow for more magnetic poles (NS pole pairs) to be arranged within the same annular space. A higher pole number results in a shorter torque fluctuation period, and the higher pole number leads to a very high torque fluctuation frequency. This effectively filters the system's rotational inertia, resulting in an almost constant torque felt by the output shaft, significantly reducing vibration and noise. Furthermore, the flattened, multi-polarized design concentrates the magnetic field primarily within a very thin air gap region. The axial distribution of the magnetic field is more symmetrical, significantly reducing the useless axial magnetic pull between the two magnetic components, alleviating the bearing load, and improving mechanical reliability and lifespan.

[0101] In this embodiment, the transmission component 21 is taken as a roller:

[0102] When the driving member 1 rotates in the first direction, the adjusting torque is used to adjust the movement of the transmission member 21 toward the narrow end 112 of the wedge groove 11 of the driving member 1, that is, to move toward the wedge tightening direction, and enter the wedge tightening position of the transmission device 10. The transmission device 10 is in the wedge engagement state, and the driving member 1 can drive the driven member 3 to rotate.

[0103] When the driven member 3 rotates in the second direction, the adjusting torque is used to adjust the movement of the transmission member 21 toward the wide end 111 of the wedge groove 11 of the driving member 1, that is, to the loosening direction, and it does not enter the wedge-tight position of the transmission device 10. The transmission device 10 is in the loose state, and the driving member 1 and the driven member 3 are in a state of mutual disengagement.

[0104] like Figures 9-10 As shown, taking the transmission component 21 as a wedge block as an example:

[0105] When the driving member 1 rotates in the first direction, the adjusting torque is used to adjust the rotation of the transmission member 21 to the narrow end 112 of the wedge groove 11 of the driving member 1, that is, to rotate in the wedge tightening direction and enter the wedge tightening position of the transmission device 10. The transmission device 10 is in a one-way wedge engagement state, and the driving member 1 can drive the driven member 3 to rotate.

[0106] When the driven member 3 rotates in the second direction, the adjusting torque is used to adjust the movement of one end of the transmission member 21 toward the wide end 111 of the wedge groove 11 of the driving member 1, that is, to rotate in the loosening direction, without entering the wedge-tight position of the transmission device 10, the transmission device 10 is in the overrunning state, the driving member 1 and the driven member 3 are in the state of mutual disengagement.

[0107] The transmission device 10 is a roller clutch, and the transmission assembly 2 includes multiple rollers. Taking this as an example, the working process of the transmission device 10 in different states is as follows:

[0108] When the driving member 1 rotates in the first direction, the adjusting torque generated by the second magnetic component 6 and the first magnetic component 5 is greater than the frictional torque generated by the rotation of the driving member 1 on the cage body 4. The rotation of the cage body 4 is blocked, and the roller is pressed into the narrow end 112 of the wedge groove 11 of the driving member 1. The transmission device 10 is in a wedge state, and the driving member 1 can drive the driven member 3 to rotate.

[0109] When the driven member 3 rotates in the second direction, the driven member 3 contacts and rubs against the roller, causing the cage body 4 and the first magnetic component 5 to rotate clockwise. During the rotation, the adjustment torque formed by the relative motion between the second magnetic component 6 and the first magnetic component 5 is greater than the frictional torque generated by the rotation of the driven member 3 on the cage body 4. The rotation of the cage body 4 is hindered, the roller is pressed into the wide end 111 of the wedge groove 11 of the driving member 1, the transmission device 10 is in the released state, and the driving member 1 does not rotate.

[0110] The present invention also provides a drive unit 700, including the above-mentioned transmission device 10, which realizes the power output of the drive unit 700 and avoids gear collision during riding, thereby improving the riding experience.

[0111] This embodiment also provides an electric bicycle, which includes the aforementioned drive unit 700. This avoids the output gear from colliding with the gear that meshes with the output gear during riding, thereby preventing gear collision noise during riding and improving the riding experience.

[0112] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A transmission device for a power-assisted bicycle drive unit, comprising a driving member (1), a transmission assembly (2), and a driven member (3), wherein the driving member (1) is used to connect to a power input end, the driven member (3) is used to connect to a power output end, and the transmission assembly (2) is located between the driving member (1) and the driven member (3), characterized in that, The transmission device further includes a cage module, which includes a cage body (4), a first magnetic component (5) and a second magnetic component (6). The transmission component (2) and the first magnetic component (5) are both mounted on the cage body (4). The second magnetic component (6) is at least partially opposite to the first magnetic component (5). The second magnetic component (6) is stationary relative to the housing (7) of the drive unit. The first magnetic component (5) and the second magnetic component (6) generate an adjusting torque, which is used to adjust the position of the transmission component (2) relative to the driving component (1).

2. The transmission device for a power-assisted bicycle drive unit according to claim 1, characterized in that, The adjusting torque is used to adjust the position of the transmission assembly (2) relative to the driving member (1) including: The adjusting torque is used to adjust the position of the cage body (4) relative to the driving member (1), thereby adjusting the position of the transmission assembly (2) relative to the driving member (1).

3. The transmission device for a power-assisted bicycle drive unit according to claim 1 or 2, characterized in that, When the driving member (1) rotates in the first direction, the adjusting torque is used to adjust the transmission assembly (2) to enter the wedge position of the transmission device.

4. The transmission device for a power-assisted bicycle drive unit according to claim 3, characterized in that, The transmission assembly (2) includes a transmission element (21), and the adjusting torque is greater than the frictional torque between the transmission element (21) and the driving element (1).

5. The transmission device for a power-assisted bicycle drive unit according to claim 1 or 2, characterized in that, When the driven member (3) rotates in the second direction, the adjusting torque is used to adjust the transmission assembly (2) so that it does not enter the wedge position of the transmission device. The first direction is opposite to the second direction.

6. The transmission device for a power-assisted bicycle drive unit according to claim 5, characterized in that, The transmission assembly (2) includes a transmission element (21), and the adjusting torque is greater than the frictional torque between the transmission element (21) and the driven element (3).

7. The transmission device for a power-assisted bicycle drive unit according to claim 1, characterized in that, At least one of the first magnetic component (5) and the second magnetic component (6) includes a non-uniform magnetic field.

8. The transmission device for a power-assisted bicycle drive unit according to claim 1, characterized in that, The magnetic direction of the first magnetic component (5) is opposite to that of the second magnetic component (6).

9. The transmission device for a power-assisted bicycle drive unit according to claim 1, characterized in that, The first magnetic component (5) includes a plurality of alternating first magnets, and adjacent first magnets in the first magnetic component (5) have opposite magnetic directions; the second magnetic component (6) includes a plurality of alternating second magnets, and adjacent second magnets in the second magnetic component (6) have opposite magnetic directions.

10. The transmission device for a power-assisted bicycle drive unit according to claim 3, characterized in that, The number of first magnets in the first magnetic component (5) and the number of second magnets in the second magnetic component (6) are the same, and the distance between adjacent first magnets in the first magnetic component (5) is equal to the distance between adjacent second magnets in the second magnetic component (6).

11. The transmission device for a power-assisted bicycle drive unit according to claim 1, characterized in that, Both the first magnetic component (5) and the second magnetic component (6) include at least one ring magnet.

12. The transmission device for a power-assisted bicycle drive unit according to claim 1, characterized in that, The first magnetic component (5) includes at least one first magnet, and the second magnetic component (6) includes a magnetic disk, wherein at least one protrusion corresponding to the first magnet is provided on the magnetic disk, and the protrusion is disposed on one side of the magnetic disk along the circumference of the magnetic disk.

13. The transmission device for a power-assisted bicycle drive unit according to claim 9 or 12, characterized in that, The second magnetic component (6) is provided in multiple forms, and is respectively provided on both sides of the first magnetic component (5).

14. The transmission device for a power-assisted bicycle drive unit according to claim 1, characterized in that, The first magnetic component (5) and the second magnetic component (6) are arranged axially opposite each other, or the first magnetic component (5) and the second magnetic component (6) are arranged radially opposite each other.

15. The transmission device for a power-assisted bicycle drive unit according to claim 1, characterized in that, The second magnetic component (6) includes an energized coil.

16. The transmission device for a power-assisted bicycle drive unit according to claim 1, characterized in that, The active component (1) is provided with a plurality of wedge-shaped grooves (11), and the transmission assembly (2) includes a plurality of transmission components (21) that are arranged one-to-one with the wedge-shaped grooves (11). The transmission components (21) can enter the wedge-tight position of the transmission device or not enter the wedge-tight position of the transmission device.

17. The transmission device for a power-assisted bicycle drive unit according to claim 4 or 6, characterized in that, When the transmission component (21) is a roller; When the driving member (1) rotates in the first direction, the adjusting torque is used to adjust the movement of the transmission member (21) toward the narrow end (112) of the wedge groove (11) of the driving member (1). The transmission device is in a wedge engagement state, and the driving member (1) can drive the driven member (3) to rotate. The driven member (3) rotates in the second direction, and the adjusting torque is used to adjust the movement of the transmission member (21) toward the wide end (111) of the wedge groove (11) of the driving member (1). The transmission device is in a released state, and the driving member (1) and the driven member (3) are in a state of mutual disengagement.

18. The transmission device for a power-assisted bicycle drive unit according to claim 4 or 6, characterized in that, When the transmission component (21) is a wedge; When the active member (1) rotates in the first direction, the adjusting torque is used to adjust the rotation of the transmission member (21) to the narrow end (112) of the wedge groove (11) of the active member (1), the transmission device of the power-assisted bicycle drive unit is in a wedge engagement state, and the active member (1) can drive the driven member (3) to rotate. When the driven member (3) rotates in the second direction, the adjusting torque is used to adjust the movement of one end of the transmission member (21) toward the wide end (111) of the wedge groove (11) of the driving member (1). The transmission device of the power-assisted bicycle drive unit is in a released state, and the driving member (1) and the driven member (3) are in a state of mutual disengagement.

19. The transmission device for a power-assisted bicycle drive unit according to claim 4 or 6, characterized in that, One end of the cage body (4) is provided with a plurality of first mounting slots (41) along its circumference. The plurality of first mounting slots (41) are provided in correspondence with the plurality of transmission components (21), and the transmission components (21) are installed in the corresponding first mounting slots (41).

20. The transmission device for a power-assisted bicycle drive unit according to claim 13, characterized in that, The other end of the cage body (4) is uniformly provided with a second mounting groove along its circumference, and the first magnetic component is installed in the second mounting groove.

21. The transmission device for a power-assisted bicycle drive unit according to claim 1, characterized in that, The second magnetic component (6) is disposed on the housing (7) of the drive unit.

22. A drive unit, characterized in that, Includes the transmission device for a power-assisted bicycle drive unit as described in any one of claims 1-21.

23. A power-assisted bicycle, characterized in that, Includes the drive unit as described in claim 22.

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