A hub motor with built-in lock structure

Abstract

This utility model discloses a hub motor with a built-in lock structure. The hub motor includes a main shaft, an outer rotor, an inner stator, a wheel rim, a sun gear, a side cover, a housing, and a built-in lock structure. The built-in lock structure includes a fixed base, a locking groove, a locking arm, a positioning arm, and a control mechanism. The locking arm and the positioning arm are oscillatingly mounted on the fixed base via a first pin and a second pin, respectively. A first elastic element and a second elastic element are respectively provided at the connection points between the locking arm and the first pin and the positioning arm and the second pin. The locking arm has a limiting tongue inserted into the locking groove, and the positioning arm has a first positioning part and a second positioning part for limiting the swing position of the locking arm. The control mechanism includes a motor housing and a push-pull unit. A motor is housed in the motor housing, and the push-pull unit is driven by the motor to control the relative movement between the locking arm and the positioning arm, controlling the switching of the locking arm between the unlocked and locked positions. This device achieves stability and reliability in the unlocking and locking processes of the hub motor.

Description

Technical Field

[0001] This utility model relates to the field of hub motor technology, and in particular to a hub motor with a built-in lock structure. Background Technology

[0002] With the widespread use of light electric vehicles such as electric bicycles and e-bikes, hub motors have been widely adopted due to their advantages such as compact structure, high drive efficiency, and low noise. To ensure vehicle safety during parking and prevent the hub motor from being illegally pushed or disassembled, hub motors with integrated locking functions have gradually appeared on the market.

[0003] Existing hub motor locking solutions mostly employ external mechanical locks or add independent locks to the outside of the hub. These solutions suffer from problems such as complex structure, susceptibility to external damage, limited installation space, and significant aesthetic impact. To address these issues, some technical solutions attempt to integrate the locking structure within the hub motor, achieving mechanical limiting and locking through an internal locking arm and a locking groove on the hub motor housing, thus improving overall security and integration. However, existing internal lock structures still have several shortcomings, such as unstable engagement between the locking arm and the positioning component, making the unlocking and locking processes susceptible to interference; unreasonable locking groove design, leading to insufficient insertion force or poor disengagement reliability; and high complexity of the control mechanism, affecting overall reliability. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a hub motor with a built-in lock structure. By optimizing the cooperation mechanism between the lock arm and the positioning arm, improving the locking groove structure and simplifying the control mechanism, the stability and reliability of the locking and unlocking process are improved, and the integration and protection capabilities of the overall structure are enhanced.

[0005] The technical solution adopted by this utility model to solve its technical problem is: a hub motor with a built-in lock structure, the hub motor including a main shaft, an outer rotor, an inner stator, a wheel rim, a sun gear, a side cover and a housing, the main shaft passing through the center of the housing, the inner stator being fixedly installed on the main shaft, the outer rotor being sleeved on the outside of the inner stator to form an electromagnetic drive structure; the sun gear is embedded in the center of the outer rotor;

[0006] The hub motor also includes an internally mounted lock structure, which comprises a fixed base, a locking groove, a locking arm, a positioning arm, and a control mechanism. The locking arm and the positioning arm are oscillatingly mounted on the fixed base via a first pin and a second pin, respectively. A first elastic element is provided at the connection between the locking arm and the first pin, and a second elastic element is provided at the connection between the positioning arm and the second pin. The locking arm has a limiting tongue inserted into the locking groove, and the positioning arm has a first positioning part and a second positioning part for limiting the swing position of the locking arm. The control mechanism includes a motor housing and a push-pull unit mounted on the fixed base. A motor is housed in the motor housing, and the push-pull unit is driven by the motor to control the relative movement between the locking arm and the positioning arm, controlling the locking arm to switch between an unlocked position and a locked position.

[0007] Furthermore, the locking arm is provided with a first limiting part and a second limiting part. The first limiting part can abut against the first positioning part on the positioning arm to limit the locking arm to the locked position; the second limiting part can abut against the second positioning part on the positioning arm to limit the locking arm to the unlocked position.

[0008] Furthermore, the push-pull unit includes an eccentric wheel, a drive pull member, and a push arm. The eccentric wheel is mounted on the output shaft of the motor. The two ends of the drive pull member are connected to the eccentric wheel and the push arm, respectively. The push arm is set on the top of the locking arm and the positioning arm. The push arm is coaxially assembled with the locking arm and is swayably set on the fixed base through the first pin. The motor can drive the eccentric wheel to rotate in both directions, thereby driving the push arm to swing to different angle positions through the drive pull member.

[0009] Furthermore, the positioning arm is provided with a guide post. When the locking arm changes position between the unlocking position and the locking position, the motor rotates to drive the push-pull unit. The push arm in the push-pull unit contacts the guide post on the positioning arm and applies force during the downward process, pushing the positioning arm away from the locking arm for the locking arm to change position. After the locking arm changes position, the push arm just leaves the guide post. The positioning arm resets under the action of the second elastic element. When the locking arm is in the locking position, the second elastic force causes the first positioning part of the positioning arm to abut against the first limiting part of the locking arm, keeping the locking arm in the locking position.

[0010] Furthermore, when the locking arm swings from the locked position to the unlocked position, the pushing arm contacts the guide post on the positioning arm and applies force during the upward process, pushing the positioning arm away from the locking arm for the locking arm to change position. After the locking arm changes position, the pushing arm just leaves the guide post, and the positioning arm resets under the action of the second elastic element. When the locking arm is in the unlocked position, the second elastic force causes the second positioning part of the positioning arm to abut against the second limiting part of the locking arm, keeping the locking arm in the unlocked position.

[0011] Furthermore, the push arm is provided with a bent portion. When the locking arm is in the locked position, during the upward swing of the push arm under the forward drive of the motor, the bent portion abuts against the locking arm and drives the locking arm to swing from the locked position to the unlocked position.

[0012] Furthermore, the locking groove is fixed inside the side cover of the hub motor and distributed circumferentially. It has a groove opening and a groove partition. The groove partition protrudes upward relative to the groove opening. The cross-sectional profile of the groove opening is trapezoidal, with the narrow side of the trapezoid facing the radially outer side of the locking groove and the wide side facing the radially inner side, which engages with the limiting tongue on the lock arm.

[0013] Furthermore, the built-in lock structure also includes an auxiliary connector, which is a plate-shaped structure disposed on the top of the push arm and respectively sleeved on the first pin and the second pin, and arranged transversely between the lock arm and the positioning arm.

[0014] The beneficial effects of this utility model are:

[0015] 1. This utility model improves the guiding and engagement stability of the locking arm limiting tongue during the locking process by adopting a locking groove structure with a trapezoidal cross section and uniform distribution along the circumference, ensuring the firmness and anti-disengagement ability in the locked state, thereby achieving the stability of the locking process.

[0016] 2. This utility model optimizes the collaborative design between the locking arm, positioning arm, and control mechanism, and utilizes the interactive relationship between the pushing arm and the guide post of the positioning arm to achieve synchronous and coordinated movement between the positioning arm and the locking arm during the unlocking process, thereby improving the reliability and smoothness of the unlocking action.

[0017] 3. By setting an auxiliary connector at the top of the push arm, which is connected to both the first and second pins, this utility model enhances the structural stability of the overall connection of the locking arm, positioning arm, and push arm, effectively improves the integration and protection performance of the built-in lock structure, and further optimizes the utilization of the internal space of the hub motor and the overall reliability. Attached Figure Description

[0018] Figure 1 This is an exploded view of the structure of the hub motor of this utility model;

[0019] Figure 2 This is a structural cross-sectional view of the hub motor of this utility model;

[0020] Figure 3 This is an overall schematic diagram of the built-in lock structure of this utility model;

[0021] Figure 4 This is a top view of the main components of the built-in lock structure of this utility model;

[0022] Figure 5 This is a schematic diagram showing the positional relationship between the lock arm and the swing arm when the built-in lock structure of this utility model is in the unlocked state;

[0023] Figure 6This is a schematic diagram showing the positional relationship between the lock arm and the swing arm when the built-in lock structure of this utility model is in the locked state;

[0024] Figure 7 This is a schematic diagram showing the cooperation relationship between the push arm and the swing arm when the built-in lock structure of this utility model is locked from the unlocked state;

[0025] Figure 8 This is a schematic diagram showing the cooperation relationship between the push arm and the swing arm when the built-in lock structure of this utility model is unlocked from the locked state;

[0026] Figure 9 This is a schematic diagram of the locking groove structure of the built-in lock structure of this utility model;

[0027] In the diagram: 1-Built-in lock structure; 11-Fixed base; 12-Locking groove; 121-Gate opening; 122-Gate spacer; 13-Auxiliary connecting piece; 14-Locking arm; 141-First pin; 142-First elastic element; 143-Limiting tongue; 144-First limiting part; 145-Second limiting part; 15-Positioning arm; 151-Second pin; 152-Second elastic element; 153-Guide post; 154-First positioning part; 155-Second positioning part; 16-Control mechanism; 161-Motor housing; 162-Eccentric wheel; 163-Drive pull piece; 164-Push arm; 1641-Bending part; 1642-First pushing part; 1643-Second pushing part; 2-Main shaft; 3-Outer rotor; 4-Inner stator; 5-Rim; 6-Sun gear; 7-Side cover; 8-Housing shell. Detailed Implementation

[0028] The present invention will now be further described with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0029] It should be noted that in this document, relational terms such as first and second are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations.

[0030] like Figure 1 and Figure 2 As shown, a hub motor with a built-in lock structure mainly includes a main shaft 2, an outer rotor 3, an inner stator 4, a wheel rim 5, a sun gear 6, a side cover 7, a housing 8, and a built-in lock structure 1.

[0031] The main shaft 2 runs through the entire hub motor, along the motor axis, and serves as the central reference component for motor installation and fixation. The main shaft 2 connects to the vehicle frame and supports the entire hub motor. The main shaft 2 has through holes for the wires driving the inner stator 4 windings to exit. In another embodiment of this invention, bearings and sealing ring assemblies can be provided at both ends of the main shaft between the main shaft and the housing 8 and the side cover 7 to ensure smooth rotation and sealing performance. The main shaft 2 can also be equipped with elastic elements (such as wave springs) to suppress axial movement between the inner stator 4 and the housing 8, ensuring the stability of the internal components.

[0032] The inner stator 4 is fixedly mounted on the main shaft 2, with winding coils evenly distributed on its outer surface, forming an electromagnetic drive structure with the outer rotor 3. The outer rotor 3 has a ring structure, fitted radially outside the inner stator 4, and contains a magnet assembly inside. When energized, it can rotate relative to the inner stator 4. The sun gear 6 is the core component of the reduction mechanism inside the hub motor, installed at the center of the outer rotor 3, with its axial direction facing the rim 5. Through meshing with the planetary gear mechanism, the sun gear 6 can transmit and reduce the high-speed rotational motion of the outer rotor 3 before outputting it to the rim 5. The rim 5 is located outside the sun gear 6 and is connected to the sun gear 6 via the planetary gear mechanism. The rim 5 serves as the output structure for the hub motor to directly drive the wheel, bearing external loads and outputting the hub motor's power.

[0033] The housing 8 is the main outer casing component of the hub motor, featuring a cylindrical structure that provides overall structural strength and sealing protection. The side cover 7 is installed on one end of the hub motor, serving to seal and secure the end, while also providing a mounting surface for the built-in lock structure 1. Figure 2 Combination Figure 3 As shown, the built-in lock structure 1 is installed and fixed to the inner side of the side cover 7 through its fixing seat 11 and locking groove 12. The locking groove 12 is distributed circumferentially along the inner side of the side cover 7, and works with the built-in lock structure to realize the locking function of the hub motor.

[0034] like Figure 3 and Figure 4 As shown, the built-in lock structure 1 includes a fixed base 11, a locking groove 12, an auxiliary connector 13, a lock arm 14, a positioning arm 15, and a control mechanism 16.

[0035] The mounting base 11 is fixedly installed on the inside of the side cover 7 and is used to support the various functional components of the built-in lock structure 1.

[0036] Locking grooves 12 are provided on the inner circumferential surface of the side cover 7 and are evenly distributed along the circumferential direction, such as... Figure 9As shown, the locking groove 12 includes several slots 121 and slot partitions 122. The slot partitions 122 protrude upwards relative to the slots 121. The cross-sectional profile of the slots 121 is trapezoidal, with the narrow side of the trapezoid facing the radially outer side of the locking groove and the wide side facing the radially inner side. The cross-sectional profile of the slot partitions 122 is also trapezoidal, with the narrow side of the trapezoid facing the radially inner side of the locking groove and the wide side facing the radially outer side.

[0037] The locking arm 14 is swayably mounted on the fixed base 11 via a first pin 141, and a first elastic element 142 acts on the locking arm 14 to provide an elastic restoring force for swinging toward the locked position. Preferably, the first elastic element 142 is a torsion spring, one end of which is fixed to the fixed base 11, and the other end acts on the locking arm 14. This design is simple in structure, provides stable elastic force, and facilitates high-frequency movement. The locking arm 14 is also provided with a limiting tongue 143, which is inserted into the locking groove 12 to achieve mechanical locking of the hub motor. Figure 5 Combination Figure 9 As shown, the trapezoidal structure design of the locking groove 12 allows the limiting tongue 143 to obtain good guiding space through the trapezoidal wide opening area when inserted into the locking groove 12. Even if there is a certain angular error in the locking arm 14 or a slight deviation in the rotation of the hub, the limiting tongue 143 can still be smoothly aligned and inserted under the guidance of the trapezoidal guide surface, avoiding jamming or hard collision. At the same time, when the limiting tongue 143 is pulled out, the trapezoidal structure narrows radially inward, providing a gradual release guide during the disengagement process, reducing the biting force at the moment of pull-out, reducing wear, and improving unlocking smoothness. Overall, the trapezoidal groove 121 improves the insertion and disengagement reliability between the limiting tongue 143 and the locking groove 12 by optimizing the guidance and meshing gap changes during the insertion and removal process, effectively improving the stability and service life of the locking action.

[0038] The positioning arm 15 is pivotally mounted on the fixed base 11 via the second pin 151, and a second elastic element 152 acts on the positioning arm 15 to provide an elastic restoring force for swinging toward the position of the locking arm 14. The second elastic element 152 is preferably a torsion spring structure, with one end fixed to the fixed base 11 and the other end acting on the positioning arm 15.

[0039] The auxiliary connector 13 is an integral plate structure with mounting holes at both ends, which are respectively fitted onto the first pin 141 and the second pin 151, and are arranged transversely between the locking arm 14 and the positioning arm 15. It is used to provide synchronous constraint support between the locking arm 14 and the positioning arm 15, further improving the structural stability during locking and unlocking, and preventing axial or lateral displacement of the parts during repeated movements.

[0040] The control mechanism 16 is fixedly mounted on the fixed base 11 and includes a motor housing 161, an eccentric wheel 162, a drive pull member 163, and a push arm 164. The motor housing 161 houses a motor, and the eccentric wheel 162 is mounted on the motor output shaft. The drive pull member 163 is a linkage structure, with one end connected to the eccentric wheel 162 and the other end hinged to the push arm 164. The drive pull member 163 rotates with the eccentric wheel 162, driving the push arm 164 to swing. The push arm 164 is swayably mounted on the fixed base 11 via a first pin 141 and is coaxially arranged with the locking arm 14, located at the top of the locking arm 14 and the positioning arm 15. The push arm 164 has a bent portion 1641, which can directly contact the locking arm 14 during the swinging process, causing the locking arm 14 to swing from the locked position to the unlocked position.

[0041] like Figures 5 to 8 As shown, during the switching process between the locked and unlocked states of the built-in lock structure 1, the locking arm 14, the positioning arm 15, and the push-pull unit in the control mechanism 16 cooperate to operate as follows:

[0042] like Figure 5 The diagram shows the positional relationship between the locking arm 14 and the positioning arm 15 when the built-in lock structure of this utility model is in the unlocked state. At this time, the limiting tongue 143 of the locking arm 14 is away from the slot 121 of the locking groove 12, and the bent portion 1641 of the pushing arm 164 does not apply force to the locking arm 14. Under the action of the second elastic element 152, the second positioning portion 155 of the positioning arm 15 is pressed against the second limiting portion 145 on the locking arm 14, keeping the locking arm 14 stably in the unlocked position.

[0043] like Figure 7The diagram shows the positional relationship between the push arm and the positioning arm when the built-in lock structure of this utility model is locked from the unlocked state. Under the action of the motor, the push arm 164 swings clockwise around the first pin 141. During the swinging process of the push arm 164, the first push part 1642 first contacts the guide post 153 on the positioning arm 15. Due to the arc-shaped structure of the push arm 164, when the push arm 164 continues to swing clockwise, it pushes the guide post 153, thereby pushing the positioning arm 15 downward away from the locking arm 14. That is, the positioning arm 15 swings counterclockwise around the second pin 151, reserving space for the swinging of the locking arm 14. At the same time, the bent part 1641 of the push arm 164 moves away from the locking arm 14. Under the action of the first elastic element 142, the locking arm 14 swings clockwise around the first pin 141. Until the limiting protrusion 143 of the locking arm 14 rotates into the groove 121 of the locking groove 12, mechanical locking is achieved. After the limiting tongue 143 is inserted, the push arm 164 continues to swing clockwise, entering the inclined structure of the push arm 164. At this time, the push arm 164 moves away from the guide post 153 and no longer applies force to the guide post 153. At this time, the positioning arm 15 is reset under the action of the second elastic element 152, and its first positioning part 154 abuts against the first limiting part 144 on the locking arm 14, reliably holding the locking arm 14 in the locked position.

[0044] like Figure 6 The diagram shows the positional relationship between the locking arm 14 and the positioning arm 15 when the built-in lock structure of this utility model is in the locked state. At this time, the limiting tongue 143 has been inserted into the slot 121 of the locking groove 12, the locking arm 14 remains in the locked position, and the positioning arm 15, under the action of the second elastic element 152, has its first positioning part 154 close to the first limiting part 144 of the locking arm 14, which prevents the locking arm 14 from swinging accidentally or being released from the locked state accidentally. The pushing arm 164 is not in contact with the guide post 153 at this time, and the bent part 1641 of the pushing arm 164 does not apply force to the locking arm 14, so the pushing arm 164 is in a standby state.

[0045] like Figure 8The diagram shows the interaction between the push arm and the positioning arm when the built-in lock structure of this utility model is unlocked from the locked state. Under the action of the motor, the push arm 164 swings counterclockwise around the first pin 141. During the counterclockwise swing, the second push part 1643 first contacts the guide post 153 on the positioning arm 15. Due to the arc-shaped structure of the push arm 164, as the push arm 164 continues to swing counterclockwise, it pushes the guide post 153, pushing the positioning arm 15 downward away from the lock arm 14. That is, the positioning arm 15 swings counterclockwise around the second pin 151, making room for the counterclockwise unlocking swing of the lock arm 14. Then, the bent part 1641 of the push arm 164 contacts the lock arm 14, directly pushing the lock arm 14 to rotate counterclockwise around the first pin 141, causing the limiting tongue 143 to disengage from the slot 121 of the locking groove 12, realizing the unlocking action. At this time, the push arm 164 rotates further counterclockwise, moving away from the guide post and no longer applying force to the guide post 153. At this time, the positioning arm 15 is reset under the action of the second elastic element 152, and its second positioning part 155 abuts against the second limiting part 145 on the locking arm 14, stably keeping the locking arm 14 in the unlocked position, thus completing the unlocking process.

[0046] The above embodiments are only for illustrating the technical concept and features of this utility model. Their purpose is to enable those skilled in the art to understand the content of this utility model and implement it. They should not be used to limit the protection scope of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be covered within the protection scope of this utility model.

Claims

1. A hub motor with a built-in lock structure, the hub motor comprising a main shaft, an outer rotor, an inner stator, a wheel rim, a sun gear, a side cover, and a housing, wherein the main shaft passes through the center of the housing, the inner stator is fixedly mounted on the main shaft, and the outer rotor is sleeved on the outside of the inner stator to form an electromagnetic drive structure; the sun gear is embedded in the center of the outer rotor; Its features are: The hub motor also includes an internally mounted lock structure, which comprises a fixed base, a locking groove, a locking arm, a positioning arm, and a control mechanism. The locking arm and the positioning arm are oscillatingly mounted on the fixed base via a first pin and a second pin, respectively. A first elastic element is provided at the connection between the locking arm and the first pin, and a second elastic element is provided at the connection between the positioning arm and the second pin. The locking arm has a limiting tongue inserted into the locking groove, and the positioning arm has a first positioning part and a second positioning part for limiting the swing position of the locking arm. The control mechanism includes a motor housing and a push-pull unit mounted on the fixed base. A motor is housed in the motor housing, and the push-pull unit is driven by the motor to control the relative movement between the locking arm and the positioning arm, controlling the locking arm to switch between an unlocked position and a locked position.

2. A hub motor with a built-in lock structure according to claim 1, characterized in that: The locking arm is provided with a first limiting part and a second limiting part. The first limiting part can abut against the first positioning part on the positioning arm to limit the locking arm to the locked position; the second limiting part can abut against the second positioning part on the positioning arm to limit the locking arm to the unlocked position.

3. A hub motor with a built-in lock structure according to claim 1, characterized in that: The push-pull unit includes an eccentric wheel, a drive pull member, and a push arm. The eccentric wheel is mounted on the output shaft of the motor. The two ends of the drive pull member are connected to the eccentric wheel and the push arm, respectively. The push arm is set on the top of the locking arm and the positioning arm. The push arm is coaxially assembled with the locking arm and is swayably set on the fixed base through the first pin. The motor can drive the eccentric wheel to rotate in both directions, and drive the push arm to swing to different angle positions through the drive pull member.

4. A hub motor with a built-in lock structure according to any one of claims 1 to 3, characterized in that: The positioning arm is equipped with a guide post. When the locking arm changes position between the unlocking position and the locking position, the motor rotates to drive the push-pull unit. The push arm in the push-pull unit contacts the guide post on the positioning arm and applies force during the downward process, pushing the positioning arm away from the locking arm for the locking arm to change position. After the locking arm changes position, the push arm just leaves the guide post. The positioning arm resets under the action of the second elastic element. When the locking arm is in the locking position, the second elastic force causes the first positioning part of the positioning arm to abut against the first limiting part of the locking arm, keeping the locking arm in the locking position.

5. A hub motor with a built-in lock structure according to claim 4, characterized in that: When the locking arm swings from the locked position to the unlocked position, the pushing arm contacts the guide post on the positioning arm and applies force during the upward process, pushing the positioning arm away from the locking arm for the locking arm to change position. After the locking arm changes position, the pushing arm just leaves the guide post, and the positioning arm resets under the action of the second elastic element. When the locking arm is in the unlocked position, the second elastic force causes the second positioning part of the positioning arm to abut against the second limiting part of the locking arm, keeping the locking arm in the unlocked position.

6. A hub motor with a built-in lock structure according to claim 5, characterized in that: The push arm has a bent part. When the locking arm is in the locked position, the push arm swings upward under the forward drive of the motor. The bent part abuts against the locking arm and drives the locking arm to swing from the locked position to the unlocked position.

7. A hub motor with a built-in lock structure according to claim 1, characterized in that: The locking groove is fixed inside the side cover of the hub motor and distributed circumferentially. It has a groove opening and a groove partition. The groove partition protrudes upward relative to the groove opening. The cross-sectional profile of the groove opening is trapezoidal, with the narrow side of the trapezoid facing the radially outer side of the locking groove and the wide side facing the radially inner side, which is engaged with the limiting tongue on the locking arm.

8. A hub motor with a built-in lock structure according to claim 1, characterized in that: The built-in lock structure also includes an auxiliary connector, which is a plate-shaped structure, disposed on the top of the push arm, respectively sleeved on the first pin and the second pin, and arranged transversely between the lock arm and the positioning arm.

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