Lock, hub motor and power-assisted bicycle

Abstract

The utility model discloses a lockset, a hub motor and a power-assisted bicycle, belongs to the bicycle locking technology, and aims to solve the problem that the conventional lockset is easy to damage and break down due to the fact that the conventional lockset is mounted outside. The first elastic force provided by the first elastic element is matched with the unlocking force provided by the controllable motor driving execution part of the unlocking mechanism to achieve locking and unlocking of the lock arm, that is, the magnitude of the first elastic force and the magnitude of the unlocking force are changed by controlling rotation of the controllable motor to achieve locking and unlocking, the structure is simple, control is easy, and work is reliable. The lock is suitable for being installed in the hub motor of the power-assisted bicycle, the lock is prevented from being damaged by violence and being damaged by external factors when exposed outside, and the safety of the lock and the power-assisted bicycle is guaranteed.

Description

Technical Field

[0001] The utility model belongs to the locking technology of bicycles, and specifically relates to a lock, a hub motor and a power-assisted bicycle. Background Art

[0002] Power-assisted bicycles are a new type of bicycle that uses an electric power-assisted system to enhance the riding experience. Hub locks and hub assemblies are very important components of power-assisted bicycles and play a key role in the performance and stability of power-assisted bicycles. Hub locks are key components used to lock hub assemblies. The design and quality of hub locks directly affect the safety and reliability of power-assisted bicycles.

[0003] Most existing power-assisted bicycles use external locks, such as mechanical locks and electronic locks. The locks are easily damaged by violence and pose safety risks. Once the lock assembly is damaged or fails, it poses a safety hazard to the user. Lock damage or failure makes it impossible to lock the power-assisted bicycle, making it easy to be stolen or lost, causing economic losses to the user. In addition, for shared bicycle rental services, the failure of the hub lock will also make it impossible to park the rental bicycle properly, affecting the smooth operation of the service. Utility Model Content

[0004] The technical problem to be solved and the technical task proposed by the utility model are to overcome the defects of the existing locks that are installed outside and are easily damaged and malfunction, and to provide a lock, a hub motor and a power-assisted bicycle. The lock is suitable for being installed inside the hub motor of the power-assisted bicycle to ensure the safety of the lock and reliable operation.

[0005] In order to achieve the above object, the lock of the utility model comprises:

[0006] The fixing seat and its fixing configuration;

[0007] A locking arm, which is swingably mounted on a fixed seat in a plane perpendicular to the axis;

[0008] A first elastic element, which provides a first elastic force for the locking arm, and the first elastic force causes the locking arm to swing toward a locking position to achieve locking;

[0009] The unlocking mechanism comprises an execution part and a controllable motor arranged on a fixed seat. The execution part is driven by the controllable motor to provide an unlocking force to cause the locking arm to swing to the unlocking position to realize unlocking.

[0010] The lock is realized by the cooperation of the first elastic force provided by the first elastic element and the unlocking force provided by the controllable motor driven execution part of the unlocking mechanism to realize the locking and unlocking of the lock arm, that is, the locking and unlocking are realized by controlling the rotation of the controllable motor to change the magnitude of the first elastic force and the unlocking force. It has a simple structure, is easy to control, and works reliably. It is suitable for installation inside the hub motor of a power-assisted bicycle to ensure the safety of the lock and the power-assisted bicycle.

[0011] Preferably, the first elastic element is a torsion spring acting on the locking arm, so as to provide a continuous first elastic force for the locking arm while occupying a relatively small space.

[0012] Preferably, the execution part includes an eccentric wheel, a connecting rod and a push arm, the eccentric wheel is mounted on the output shaft of the controllable motor, the push arm is swingably mounted on the fixed seat in a plane perpendicular to the axis, and the connecting rod is connected between the eccentric wheel and the push arm, and is used for the eccentric wheel to pull the push arm to swing through the connecting rod when the controllable motor is unlocked and rotated, and the push arm provides an unlocking force to the locking arm, and when the controllable motor is locked and rotated, the eccentric wheel pushes the push arm to swing through the connecting rod to release the locking arm, and the first elastic force of the first elastic element causes the locking arm to lock. Accordingly, the controllable motor drives the eccentric wheel to rotate to realize the swing of the push arm within a set range, and accordingly the locking arm is accurately and precisely switched between the unlocking position and the locking position.

[0013] Preferably, the push arm and the lock arm are coaxially assembled on the fixing seat and axially overlapped, and one edge of the push arm is provided with a bent portion for pushing the lock arm to provide unlocking force, thereby making the lock compact and saving the space occupied by the lock.

[0014] Preferably, the connecting rod is a helical tension spring, so that the connecting rod can slightly change its length when being pulled or compressed, thereby compensating for the position error of the push arm. When the lock is in the locked state or unlocked state, the elastic force of the helical tension spring can eliminate the shaking of the push arm and the lock arm.

[0015] Preferably, the lock comprises a swing arm swingably mounted on a fixed seat in a plane perpendicular to the axis and a second elastic element providing a second elastic force for the swing arm. When the controllable motor rotates to make the lock arm swing and change position between the unlocking position and the locking position, the swing arm is first pushed away from the lock arm by the push arm to allow the lock arm to change position. After the lock arm changes position, the push arm releases the swing arm. The swing arm is reset by the second elastic force. When the lock arm is in the locking position, the second elastic force prompts the swing arm to abut against the lock arm to keep the lock arm in the locking position. When the lock arm is in the unlocking position, the second elastic force prompts the swing arm to abut against the lock arm to keep the lock arm in the unlocking position. In this way, the lock arm is prevented from being accidentally unlocked in the locked state and accidentally locked in the unlocking position.

[0016] Preferably, the push arm has a first head, the swing arm has a second head and a column is provided on the second head, and the first head pushes the column to enable the push arm to push the swing arm away from the locking arm. Accordingly, it is easy to control the push arm and the swing arm to cooperate accurately and eliminate the wear and tear caused by frequent movements of the two arms.

[0017] Preferably, the first head has a first abutting portion for abutting the column during locking and a second abutting portion for abutting the column during unlocking, and a transition section smoothly transitioning from the first abutting portion to the second abutting portion. Accordingly, during locking and unlocking, as the abutting arm swings, the transition section contacts and slides with the column to keep the swing arm away from the position that blocks the swing of the lock arm, making way for the swing of the lock arm.

[0018] Preferably, the lock arm has a first positioning portion and a second positioning portion, and when the lock arm is in the locked position, the second elastic force causes the swing arm to abut against the first positioning portion of the lock arm to keep the lock arm in the locked position, and when the lock arm is in the unlocked position, the second elastic force causes the swing arm to abut against the second positioning portion of the lock arm to keep the lock arm in the unlocked position. Accordingly, whether in the unlocked position or the locked position, the force applied by the swing arm to the lock arm can always be kept in a suitable direction to keep the lock arm in a corresponding position without losing its position.

[0019] Preferably, the second elastic element is a torsion spring acting on the swing arm, so as to provide a continuous first elastic force for the swing arm while occupying a relatively small space.

[0020] Preferably, the fixing seat is provided with a containing box, and the controllable motor is located in the containing box, so as to protect the motor.

[0021] Preferably, the lock comprises a first circuit board for controlling the controllable motor. The rotation of the controllable motor is accurately controlled by the first circuit board.

[0022] In order to achieve the above-mentioned purpose, the wheel hub motor of the utility model comprises a main shaft, an inner stator fixed to the main shaft, an outer rotor sleeved on the radial outer side of the inner stator, and a wheel hub shell rotated by the outer rotor, wherein the inner stator and the outer rotor are located in the wheel hub shell, the main shaft is passed through the wheel hub shell and its two ends extend out of the wheel hub shell, and the utility model is characterized in that: the lock of the utility model is arranged in the wheel hub shell, the fixing seat is fixed to the main shaft, a plurality of locking grooves are distributed on the circumferential wall of the wheel hub shell, the locking arm has a locking part, the locking part is inserted into the locking groove to achieve locking, and the locking part is separated from the locking groove to achieve unlocking. Accordingly, the lock of the utility model is applied to the wheel hub motor, and the lock is installed inside the wheel hub motor to prevent the lock from being violently damaged and malfunctioning due to external factors when exposed to the outside.

[0023] Preferably, the lock comprises a first circuit board for controlling the controllable motor, a second circuit board is fixed in the wheel hub shell, and the first circuit board is connected to the second circuit board. Accordingly, the control of the lock can be associated with the control of the wheel hub motor, so that the lock is suitable for the working state of the wheel hub motor without interfering with the work of the wheel hub motor.

[0024] Preferably, the inner wall of the hub shell is provided with a magnet, and the lock includes a Hall element, and the magnetic field of the Hall element induction magnet is used to determine the rotation speed of the hub shell. Accordingly, the rotation speed of the hub shell can be associated with the control of the lock to ensure the safety of the hub shell rotation.

[0025] The power-assisted bicycle of the utility model has a driving wheel, the driving wheel is equipped with a hub motor of the utility model, and a key is configured for the lock, so that the power-assisted bicycle can be locked and unlocked by the key.

[0026] The lock of the utility model configures a locking arm and an unlocking mechanism on a fixed seat, and the first elastic force provided by the first elastic element and the unlocking force provided by the controllable motor driven execution part of the unlocking mechanism cooperate with each other to achieve locking and unlocking of the locking arm, that is, locking and unlocking are achieved by controlling the rotation of the controllable motor to change the magnitude of the first elastic force and the unlocking force. The utility model has a simple structure, is easy to control, and works reliably.

[0027] The lock of the utility model is suitable for being installed inside the hub motor of the power-assisted bicycle, so as to prevent the lock from being violently damaged and from malfunctioning due to external factors when exposed to the outside, thereby ensuring the safety of the lock and the power-assisted bicycle. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is an orthographic projection schematic diagram of the hub motor of the utility model;

[0029] Figure 2 for Figure 1 AA section perspective view;

[0030] Figure 3 for Figure 1 BB section orthographic projection drawing;

[0031] Figure 4 for Figure 1 CC section orthographic projection drawing;

[0032] Figure 5 for Figure 1 The schematic diagram of the structural decomposition of the wheel hub motor shown;

[0033] Figure 6 for Figure 5 a schematic diagram of another view of the structure shown;

[0034] Figure 7 is a perspective view of the lock of the utility model;

[0035] Figure 8 for Figure 7 A schematic diagram of the structure of the lock shown;

[0036] Fig. 9It is a schematic diagram of the position relationship between the lock arm and the swing arm when the lock of the utility model is in the unlocked state;

[0037] Fig.10 It is a schematic diagram of the position relationship between the lock arm and the swing arm when the lock of the utility model is in a locked state;

[0038] Fig.11 It is a schematic diagram of the cooperation relationship between the push arm and the swing arm when the lock of the utility model is locked from the unlocked state;

[0039] Fig.12 It is a schematic diagram of the matching relationship between the push arm and the swing arm when the lock of the utility model is unlocked from a locked state;

[0040] Description of the numbers in the figure:

[0041] 100 locks:

[0042] 110 fixing seat, 111 containing box, 112 box cover,

[0043] 120 locking arm, 121 first elastic element, 122 first positioning portion, 123 second positioning portion, 124 locking portion, 125 first pin shaft,

[0044] 130 unlocking mechanism, 131 controllable motor, 132 eccentric wheel, 133 connecting rod, 134 push arm, 135 bending part, 136 first head, 137 first push part, 138 second push part, 139 transition section,

[0045] 140 swing arm, 141 second elastic element, 142 second head, 143 column, 144 second pin shaft,

[0046] 150 first circuit board;

[0047] 200 hub motor: 210 main shaft, 220 inner stator, 230 outer rotor, 240 hub shell, 241 shell, 242 cover, 243 locking groove, 250 second circuit board, 260 magnetic steel, 270 reduction mechanism, 271 sun gear, 272 planetary gear, 273 gear rack, 274 wheel rim. DETAILED DESCRIPTION

[0048] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0049] The terms "including" and "having" and any variations thereof in the specification and claims of the present utility model are intended to cover non-exclusive inclusions. For example, a method or product comprising a series of technical features is not necessarily limited to those technical features clearly listed, but may also include other technical features that are not clearly listed and can be included in the method or product.

[0050] In the description of the present utility model, it is necessary to understand that the technical features defined by the terms "first", "second" and the like with sequential concepts are only for the purpose of clearly describing the defined technical features so that the defined technical features can be clearly distinguished from other technical features, but do not represent such naming in actual implementation, and therefore cannot be understood as a limitation of the present utility model.

[0051] The present invention is described in detail below in conjunction with specific embodiments and drawings.

[0052] like Figure 1-6 As shown, the hub motor 200 includes a main shaft 210, an inner stator 220 fixed to the main shaft, an outer rotor 230 sleeved on the radial outer side of the inner stator, a hub shell 240 driven by the outer rotor through a speed reduction mechanism 270, and a lock 100. The hub motor 200 is configured on the driving wheel of the power-assisted bicycle, and keys are configured for the lock and the power-assisted bicycle. The power-assisted bicycle is locked and unlocked by the key. The key can be an electronic key that wirelessly communicates with the circuit board, or it can be a mechanical key. When a mechanical key is used, the circuit switch is controlled by the mechanical key, and the circuit switch is connected to the circuit board through a signal line to transmit the locking signal and the unlocking signal.

[0053] The hub shell 240 is assembled from a shell body 241 and a cover 242 , and a plurality of locking grooves 243 are distributed on the circumferential wall of the cover 242 constituting the hub shell.

[0054] The inner stator 220 and the outer rotor 230 are located in the wheel hub shell 340. The main shaft 210 is inserted into the wheel hub shell 240 and its two ends extend out of the wheel hub shell for fixed installation on the power-assisted bicycle. The main shaft 210 is also provided with a threading hole for threading the wires for supplying power to the winding of the inner stator. Bearings are arranged at each relatively rotating position. A sealing ring is arranged at the position where the main shaft passes through the end face of the shell and the cover. In order to eliminate the axial movement of the wheel hub shell relative to the inner stator, a wave spring located on the inner side of the end face of the shell is sleeved on the main shaft.

[0055] The speed reduction mechanism 270 is a planetary gear set, which includes a sun gear 271, planetary gears 272, a gear carrier 273 and a wheel rim 274. The sun gear 271 is fixed to the end face of the outer rotor 230, the wheel rim 274 is fixed to the inner circumferential wall of the housing 241, and three planetary gears 272 are evenly assembled on the planet carrier 273 and located between the sun gear 271 and the wheel rim 274. The planet carrier 273 is fixed to the main shaft 210. Accordingly, the high speed rotation of the outer rotor 230 is converted into the low speed rotation of the hub shell 240 through the speed reduction mechanism.

[0056] like Figure 7-12 As shown, the lock 100 includes a fixing seat 110 , a locking arm 120 , a first elastic element 121 and an unlocking mechanism 130 .

[0057] The fixing base 100 is in a disc shape.

[0058] The locking arm 120 is swingably mounted on the fixing seat 110 via a first pin 125 in a plane perpendicular to the axis of the main shaft 210 .

[0059] The first elastic element 121 is a torsion spring sleeved on the first pin 125, one end of the torsion spring is fixed to the base, and the other end of the torsion spring acts on the lock arm to provide a first elastic force for the lock arm. The first elastic force causes the lock arm 120 to swing to the locking position to achieve locking. Fig. 9 and Fig.11 In the embodiment, the locking arm swings toward the locking position when the swing arm 120 swings from the inside of the contour of the fixing seat 110 to the outside of the contour of the fixing seat 110 , that is, swings in the clockwise direction around the first pin 125 .

[0060] The unlocking mechanism 130 includes an execution part and a controllable motor 131 disposed on a fixed seat. The execution part is driven by the controllable motor to provide an unlocking force to cause the locking arm 120 to swing to the unlocking position to achieve unlocking. Fig.10 and Fig.12 In the embodiment, the locking arm swings toward the unlocking position when the swing arm 120 swings from the outside of the contour of the fixing seat 110 to the inside of the contour of the fixing seat 110 , that is, swings counterclockwise around the first pin 125 .

[0061] In the illustrated structure, the execution part 130 includes an eccentric wheel 132, a connecting rod 133 and a push arm 134. The eccentric wheel 132 is mounted on the output shaft of the controllable motor 131. The push arm 134 is swingably mounted on the fixed seat 110 in a plane perpendicular to the main shaft axis. The connecting rod 133 is connected between the eccentric wheel 132 and the push arm 134 to rotate the eccentric wheel when the controllable motor is unlocked. Fig.12 As shown in the figure, the push arm 134 is pulled by the connecting rod 133 to swing in the counterclockwise direction and the push arm 134 provides an unlocking force to the lock arm 120 to make the lock arm swing to the unlocking position. When the controllable motor is locked and rotated, the eccentric wheel 132 is as shown in the figure. Fig.11As shown, the locking arm 120 is released by the connection rod 133 pushing the push arm 134 to swing clockwise, and the first elastic force of the first elastic element 121 causes the locking arm to swing to the unlocking position. In addition, the push arm 134 and the locking arm 120 are coaxially assembled on the first pin 125 of the fixing seat and axially overlapped, and one edge of the push arm 134 is provided with a bent portion 135 for pushing the locking arm 120 to provide unlocking force. The connection rod 133 is a helical tension spring.

[0062] In other embodiments, the push arm can be omitted, that is, the execution part only includes an eccentric wheel and a connecting rod, and the connecting rod is directly connected to the locking arm. During operation, the controllable motor drives the eccentric wheel to rotate and directly push and pull the locking rod to swing.

[0063] exist Figure 7-12 In the structure shown, the lock also includes a swing arm 140 swingably mounted on the fixed seat 110 in a plane perpendicular to the axis through a second pin 144 and a second elastic element 141 providing a second elastic force for the swing arm. The second elastic element 141 is a torsion spring sleeved on the second pin 144, one end of the torsion spring is fixed to the base, and the other end of the torsion spring acts on the swing arm to provide a second elastic force for the swing arm. In the figure, the second elastic force prompts the swing arm 140 to approach the locking arm 120 to resist the locking arm. Moreover, the push arm 134 has a first head 136, the swing arm 140 has a second head 142 and a column 143 is provided on the second head, and the first head 136 pushes against the column 143 to realize that the push arm pushes the swing arm away from the locking arm. The first head 136 has a first push portion 137 for pushing against the column 143 during the locking process and a second push portion 138 for pushing against the column during the unlocking process, and a transition section 139 is provided between the first push portion and the second push portion to smoothly transition between the two. The locking arm 120 has a first positioning portion 122 and a second positioning portion 123. Fig.10 When the lock arm 120 is in the locked position, the second elastic force causes the swing arm 140 to abut against the first positioning portion 122 of the lock arm to keep the lock arm in the locked position. Fig. 9 When the lock arm 120 is in the unlocked position, the second elastic force causes the swing arm 140 to abut against the second positioning portion 123 of the lock arm to keep the lock arm in the unlocked position. Fig.10 When swinging and changing between the locking positions shown, the swing arm 140 is first pushed away from the locking arm 120 by the pushing arm 134 to allow the locking arm to change position. After the locking arm 120 changes position, the pushing arm 134 releases the swing arm 140, and the swing arm 140 is reset by the second elastic force. When the locking arm 120 is in the locking position, the second elastic force prompts the swing arm to press against the locking arm to keep the locking arm in the locking position; when the locking arm is in the unlocking position, the second elastic force prompts the swing arm to press against the locking arm to keep the locking arm in the unlocking position.

[0064] The fixing seat 110 is provided with a containing box 111 , the controllable motor 121 is located in the containing box 111 , a first circuit board 150 for controlling the controllable motor is also provided in the containing box 111 , and the controllable motor 131 and the first circuit board 150 are shielded in the containing box by a box cover 112 .

[0065] As mentioned above, the lock 100 is assembled in the hub shell 240, and the fixing seat 110 is fixedly assembled to the main shaft 210 through the hole in the center thereof. The locking arm 120 has a locking portion 124, which is locked by being inserted into the locking groove 243, and unlocked by being disengaged from the locking groove 243.

[0066] A second circuit board 250 is fixed inside the hub shell 240, and the first circuit board 150 is connected to the second circuit board 250. A magnet 260 is provided on the inner wall of the cover 242 constituting the hub shell. The lock 100 includes a Hall element, which is arranged on the first circuit board. The magnetic field of the Hall element induction magnet is used to determine the rotation speed of the hub shell. According to this structure, the conditions can be set to prevent the occurrence of mislocking during riding: the magnetic field strength of the magnet is sensed by the Hall element to obtain a pulse signal, and the bicycle wheel rotation speed is calculated by the circuit board. When the rotation speed of the hub shell exceeds the protection speed, the connection channel between the controllable motor and the external control signal such as the key is disconnected, and the controllable motor does not perform any operation, or maintains the control signal. Further, when the rotation speed of the hub shell is lower than the protection speed, the operation command can be executed by the external control signal such as the key, and the hub shell can perform the corresponding locking action according to the external control signal such as the key. This can effectively prevent misoperation and improve the reliability and safety of the locking structure.

[0067] In the lock structure shown above, the controllable motor stops rotating in the locked and unlocked states. Fig. 9 When the lock is in the unlocked state, the second elastic force causes the swing arm 140 to abut against the second positioning portion 123 of the lock arm to keep the lock arm 120 in the unlocked position, and the lock arm will not swing to the locked position.

[0068] When the lock is to be locked from the unlocked state, the controllable motor 131 is instructed to rotate to lock by an external control signal (such as a key). Fig.11 The eccentric wheel pushes the push arm 134 to swing in the clockwise direction through the connecting rod 133, first pushing the swing arm 140 away from the locking arm to make way for the locking arm to swing, and then the locking arm 120 swings in the clockwise direction under the action of the first elastic force to achieve locking. Fig.11 In the figure, the arc segment indicated by the single-point dashed line is the trajectory of the swing of the end of the locking arm. Until the push arm turns away from the swing arm, the swing arm is reset under the action of the second elastic force, causing the swing arm 140 to Fig.10 The first positioning portion 122 abutting against the locking arm keeps the locking arm in the locked position, and the locking arm will not swing to the unlocked position.

[0069] When unlocking from the locked state, the controllable motor 131 is instructed to rotate to unlock by an external control signal (such as a key). Fig.12 The eccentric wheel pulls the push arm 134 to swing counterclockwise through the connecting rod 133, first pushing the swing arm 140 away from the lock arm to make way for the lock arm to unlock and swing, and then the lock arm 120 overcomes the first elastic force and swings counterclockwise to unlock under the unlocking force (thrust) provided by the push arm 134. Fig.12 In the figure, the arc segment indicated by the single-point dashed line is the trajectory of the swing of the end of the locking arm. Until the push arm turns away from the swing arm, the swing arm is reset under the action of the second elastic force, causing the swing arm 140 to Fig. 9 The second positioning portion 123 abutting against the locking arm keeps the locking arm at the unlocking position, and the locking arm will not swing to the locking position.

[0070] As mentioned above, both the unlocking and locking actions originate from external commands, which cause the controllable motor to rotate accordingly. When the vehicle is driving, in order to avoid accidental locking, as mentioned above, when the vehicle speed exceeds the protection speed (such as 5km / h), the connection channel between the controllable motor and the external control signal such as the key is disconnected, and the controllable motor does not perform any operation, or maintains the control signal. Only when the vehicle speed is lower than the protection speed (such as 5km / h) can the operation command be executed through an external control signal such as a key, and the wheel hub shell can perform the corresponding locking action according to the external control signal such as the key. This can effectively prevent misoperation and improve the reliability and safety of the locking structure.

Claims

1. Locks, characterized by include: A fixing seat (110), which is fixedly configured; A locking arm (120) is mounted on the fixing seat (110) so as to be swingable in a plane perpendicular to the axis; A first elastic element (121) provides a first elastic force for the locking arm (120), the first elastic force causing the locking arm to swing toward a locking position to achieve locking; The unlocking mechanism (130) comprises an execution part and a controllable motor (131) arranged on a fixed seat, wherein the execution part is driven by the controllable motor to provide an unlocking force to cause the locking arm (120) to swing to an unlocking position to realize unlocking.

2. The lock according to claim 1, characterized in that: The first elastic element (121) is a torsion spring acting on the locking arm.

3. The lock according to claim 1, characterized in that: The execution part comprises an eccentric wheel (132), a connecting rod (133) and a push arm (134); the eccentric wheel (132) is mounted on the output shaft of the controllable motor (131); the push arm (134) is swingably mounted on the fixed seat (110) in a plane perpendicular to the axis; the connecting rod (133) is connected between the eccentric wheel (132) and the push arm (134) and is used for, when the controllable motor is unlocked and rotated, the eccentric wheel (132) pulls the push arm (134) to swing through the connecting rod (133) and the push arm provides an unlocking force to the locking arm (120); when the controllable motor is locked and rotated, the eccentric wheel (132) pushes the push arm (134) to swing through the connecting rod (133) to release the locking arm (120) and the first elastic force of the first elastic element (121) causes the locking arm (120) to lock.

4. The lock according to claim 3, characterized in that: The push arm (134) and the lock arm (120) are coaxially assembled on the fixed seat (110) and axially overlapped, and one edge of the push arm (134) is provided with a bent portion (135) for pushing the lock arm (120) to provide unlocking force.

5. The lock according to claim 3 or 4, characterized in that: The connecting rod (133) is a helical tension spring.

6. The lock according to claim 3 or 4, characterized in that: The lock comprises a swing arm (140) swingably mounted on a fixed seat (110) in a plane perpendicular to the axis, and a second elastic element (141) providing a second elastic force for the swing arm. When the controllable motor (131) rotates to make the lock arm (120) swing between an unlocking position and a locking position, the swing arm (140) is first pushed away from the lock arm (120) by a push arm (134) for the lock arm to change position. After the lock arm (120) changes position, the push arm (134) releases the swing arm (140). The swing arm (140) is reset by the second elastic force. When the lock arm (120) is in the locking position, the second elastic force prompts the swing arm (140) to abut against the lock arm (120) to keep the lock arm in the locking position. When the lock arm (120) is in the unlocking position, the second elastic force prompts the swing arm (140) to abut against the lock arm (120) to keep the lock arm in the unlocking position.

7. The lock according to claim 6, characterized in that: The push arm (134) has a first head (136), the swing arm (140) has a second head (142) and a column (143) is provided on the second head, and the first head (136) pushes against the column (143) to enable the push arm (134) to push the swing arm (140) away from the locking arm (120).

8. The lock according to claim 7, characterized in that: The first head (136) comprises a first abutting portion (137) for pushing against the column (143) during locking and a second abutting portion (138) for pushing against the column (143) during unlocking, and a transition section (139) for smoothly transitioning between the first abutting portion (137) and the second abutting portion (138) is provided between the first abutting portion (137) and the second abutting portion (138).

9. The lock according to claim 6, characterized in that: The locking arm (120) has a first positioning portion (122) and a second positioning portion (123); when the locking arm (120) is in a locked position, a second elastic force causes the swing arm (140) to abut against the first positioning portion (122) of the locking arm to keep the locking arm in the locked position; when the locking arm (120) is in an unlocked position, the second elastic force causes the swing arm (140) to abut against the second positioning portion (123) of the locking arm to keep the locking arm in the unlocked position.

10. The lock according to claim 6, characterized in that: The second elastic element (141) is a torsion spring acting on the swing arm.

11. The lock according to claim 1, characterized in that: The fixing seat (110) is provided with a containing box (111), and the controllable motor (131) is located in the containing box (111).

12. The lock according to claim 1 or 11, characterized in that: The lock comprises a first circuit board (150) for controlling a controllable motor.

13. A wheel hub motor, comprising a main shaft (210), an inner stator (220) fixed to the main shaft, an outer rotor (230) sleeved on the radially outer side of the inner stator, and a wheel hub shell (240) driven by the outer rotor to rotate, wherein the inner stator and the outer rotor are located in the wheel hub shell, the main shaft is passed through the wheel hub shell and its two ends extend out of the wheel hub shell, and the characteristics are: The wheel hub shell (240) is provided with a lock (100) as claimed in any one of claims 1 to 11. The fixing seat (110) is fixed to the main shaft (210). The circumferential wall of the wheel hub shell is provided with a plurality of locking grooves (243). The locking arm (120) has a locking portion (124). The locking portion (124) is inserted into the locking groove (243) to achieve locking, and the locking portion (124) is disengaged from the locking groove (243) to achieve unlocking.

14. The hub motor according to claim 13, characterized in that: The lock comprises a first circuit board (150) for controlling a controllable motor, a second circuit board (250) is fixed inside the hub shell (240), and the first circuit board is connected to the second circuit board.

15. The hub motor according to claim 13, characterized in that: The inner wall of the hub shell (240) is provided with a magnetic steel (260), and the lock comprises a Hall element. The Hall element senses the magnetic field of the magnetic steel to determine the rotation speed of the hub shell.

16. A power-assisted bicycle having a driving wheel, characterized in that: The driving wheel is equipped with a hub motor as described in any one of claims 13-15, and the lock is equipped with a key.

Images