Unidirectional bearing hub motor

Abstract

The utility model provides a one-way bearing hub motor, and relates to the technical field of hub motors. The hub comprises a hub shell, a center shaft, a motor assembly, a one-way bearing and a speed reducing and torque increasing assembly, a mounting hole is formed in the hub shell along a rotating shaft of the hub shell, and the center shaft is inserted into the mounting hole; the motor assembly comprises a stator, a rotor and a rotor bearing seat, the stator can drive the rotor to rotate, the rotor is arranged on the rotor bearing seat, and the rotor bearing seat is arranged on the outer ring of the one-way bearing in a sleeving mode; the power input end of the speed reducing and torque increasing assembly is in transmission connection with the inner ring of the one-way bearing, and the power output end of the speed reducing and torque increasing assembly is in transmission connection with the hub shell and can drive the hub shell to rotate around the center shaft. Space for installing the one-way clutch does not need to be reserved in the machine shell, and the one-way clutch has the advantages of being light in weight and small in size.

Description

Technical Field

[0001] The present application relates to the technical field of hub motors, and in particular to a one-way bearing hub motor. Background Art

[0002] The wheel hub motor is a driving structure used to drive the wheels to rotate.

[0003] Existing hub motors generally include a hub shell, a center shaft, a motor assembly, a planetary gear set and a one-way clutch. The two ends of the center shaft are used to connect to the vehicle frame. The hub shell is sleeved on the middle of the center shaft. The motor assembly includes a stator and a rotor. Both the stator and the rotor are arranged in the hub shell. The stator can drive the rotor to rotate around the center shaft, and the rotor is connected to the sun gear in the planetary gear set. The outermost ring gear of the planetary gear set is connected to the hub shell through a one-way clutch so that the power output by the motor assembly can be reduced and transmitted to the hub shell through the planetary gear set.

[0004] However, since the outermost ring gear of the planetary gear set is relatively large, and the hub motor must use a large-sized one-way clutch that is compatible with the ring gear, the hub motor is large in size and heavy in weight.

[0005] In view of this, it is necessary to provide a one-way bearing hub motor. Utility Model Content

[0006] In order to solve the problem that the existing hub motor must use a large-sized one-way clutch due to the size limitation of the planetary gear set, resulting in a large size and heavy weight of the hub motor, the present application provides a one-way bearing hub motor.

[0007] The present application provides a one-way bearing hub motor, which adopts the following technical solution: comprising a hub shell, a central shaft, a motor assembly, a one-way bearing and a speed reduction and torque increasing assembly, wherein a mounting hole is provided on the hub shell along its rotation axis, and the central shaft is inserted into the mounting hole;

[0008] The motor assembly comprises a stator, a rotor and a rotor bearing seat, wherein the stator can drive the rotor to rotate, the rotor is arranged on the rotor bearing seat, and the rotor bearing seat is sleeved on the outer ring of the one-way bearing;

[0009] The power input end of the deceleration and torque-increasing assembly is transmission-connected to the inner ring of the one-way bearing, and the power output end of the deceleration and torque-increasing assembly is transmission-connected to the wheel hub shell and can drive the wheel hub shell to rotate around the central axis.

[0010] By adopting the above technical solution, with the forward direction of the wheel as the positive direction, when the stator drives the rotor to rotate forward, the rotor will drive the rotor bearing seat to rotate forward together. At this time, the inner ring and the outer ring of the one-way bearing will be locked, so as to be able to transmit power to the power input end of the speed reduction and torque increase assembly through the one-way bearing, so that the power output end of the speed reduction and torque increase assembly can drive the hub housing to drive the wheel to rotate forward; when the wheel rotates in the reverse direction, the hub housing will transmit the power back to the inner ring of the one-way bearing through the speed reduction and torque increase assembly. At this time, the inner ring of the one-way bearing can rotate freely in the outer ring and block the power transmission between the speed reduction and torque increase assembly and the motor assembly, avoiding the situation that the motor is damaged because the rotor is driven by the wheel to rotate in the reverse direction together; the setting of the one-way bearing also makes it unnecessary to use a large-size one-way clutch in the hub motor, which not only makes the hub motor light in weight, but also makes the hub motor not need to leave space in the casing for installing the one-way clutch, and the size is small.

[0011] Specifically, the stator is fixedly connected to the central shaft, and a coil is provided on the outer side of the stator;

[0012] The rotor is sleeved on the stator, and a magnet is provided on the inner side of the rotor and is adapted to the coil.

[0013] By adopting the above technical solution, the stator can drive the rotor to drive the rotor bearing seat to rotate around the central shaft through the coil, so as to be able to output power outward through the rotor bearing seat.

[0014] Further, the speed reduction and torque increase assembly includes a sun gear, a planet gear and an outer gear ring. The sun gear is sleeved on the central shaft, and an input ring is provided on the side face of the sun gear close to the rotor bearing seat. The inner ring of the one-way bearing is sleeved on the input ring;

[0015] The outer gear ring is sleeved on the sun gear and is connected to the inner wall of the hub housing. The planet gear is arranged between the outer gear ring and the sun gear and meshes with both the outer gear ring and the sun gear at the same time.

[0016] By adopting the above technical solution, when the rotor bearing seat drives the outer ring of the one-way bearing to rotate forward, the inner ring of the one-way bearing will be locked with the outer ring and drive the input ring to rotate together, so as to be able to drive the sun gear to rotate through the input ring, and then transmit the power to the outer gear ring through the planet gear, so that the outer gear ring can drive the hub housing to rotate.

[0017] Further, the speed reduction and torque increase assembly further includes a planet carrier. A plurality of the planet gears are provided between the outer gear ring and the sun gear, and each planet gear is rotatably connected to the planet carrier.

[0018] By adopting the above technical solution, the planet carrier can connect each planet gear into a whole; and the setting of multiple planet gears can increase the number of teeth meshing between the planet gears and the sun gear and the external gear ring, so that the operation of the speed reduction and torque increase assembly is more stable, and it has strong shock resistance and vibration resistance.

[0019] Specifically, the motor assembly further includes a Hall plate, and the Hall plate is arranged on the stator.

[0020] By adopting the above technical solution, the Hall plate can detect the position and speed of the rotor and feedback the detection result to the vehicle controller electrically connected to the Hall plate, so as to facilitate the vehicle controller to control the one-way bearing hub motor.

[0021] Furthermore, the motor assembly further includes a power cord. A wire passing hole leading to the inside of the hub housing is formed in the shaft body of the central shaft extending out of the hub housing. One end of the power cord is provided with a plug, and the other end of the power cord passes through the wire passing hole and is connected to the stator and the Hall plate.

[0022] By adopting the above technical solution, the one-way bearing hub motor can be connected to the power supply device and the controller on the vehicle through the plug on the power cord, so that the power supply device can provide power for the stator and the Hall plate through the power cord, and the controller can be electrically connected to the Hall plate through the power cord.

[0023] Specifically, both ends of the central shaft are provided with tapered thread sections for connecting with the frame of the electric bicycle.

[0024] By adopting the above technical solution, the central shaft can be threadedly connected to the frame of the electric bicycle through the tapered thread section, so as to improve the connection stability between the central shaft and the frame.

[0025] Specifically, one side of the hub housing is provided with a disc brake fixed end cover for installing a disc brake.

[0026] By adopting the above technical solution, the disc brake fixed end cover can be used to install a disc brake, so as to brake the wheel connected to the hub housing through the disc brake.

[0027] In summary, the present application includes the following beneficial technical effects:

[0028] It includes a hub housing, a central shaft, a motor assembly, a one-way bearing, and a speed reduction and torque increase assembly. An installation hole is provided on the hub housing along its rotation axis, and the central shaft is inserted into the installation hole. The motor assembly includes a stator, a rotor, and a rotor bearing seat. The stator can drive the rotor to rotate. The rotor is arranged on the rotor bearing seat, and the rotor bearing seat is sleeved on the outer ring of the one-way bearing. The power input end of the speed reduction and torque increase assembly is in transmission connection with the inner ring of the one-way bearing, and the power output end of the speed reduction and torque increase assembly is in transmission connection with the hub housing and can drive the hub housing to rotate around the central shaft, so that a large-sized one-way clutch is not required in the hub motor, which can not only make the hub motor light in weight, but also enable the hub motor not to leave space for installing the one-way clutch in the casing, and the size is small. Brief Description of the Drawings

[0029] Figure 1 is a perspective view of a one-way bearing hub motor of the present application;

[0030] Figure 2 is along Figure 1 the central axis of the central shaft in the

[0031] Figure 3 is an exploded view of a one-way bearing hub motor of the present application, in which an input ring and an output ring are shown.

[0032] Reference Numerals: 1, hub housing; 11, disc brake fixed end cover; 2, central shaft; 21, tapered thread section; 3, motor assembly; 31, stator; 32, rotor; 33, rotor bearing seat; 331, output ring; 34, Hall plate; 35, power cord; 351, plug; 4, one-way bearing; 5, speed reduction and torque increase assembly; 51, sun gear; 511, input ring; 52, planet gear; 53, external gear ring; 54, planet carrier. Detailed Description of the Embodiments

[0033] Figure 1 is a perspective view of a one-way bearing hub motor of the present application, Figure 2 is along Figure 1 the central axis of the central shaft in the Figure 1 and Figure 2 A one-way bearing hub motor provided by the present application includes: a hub housing 1, a central shaft 2, a motor assembly 3, a one-way bearing 4, and a speed reduction and torque increase assembly 5. An installation hole is provided on the hub housing 1 along its rotation axis, and the central shaft 2 is inserted into the installation hole. The motor assembly 3 includes a stator 31, a rotor 32, and a rotor 32 bearing seat. The stator 31 is fixedly connected to the central shaft 2, and a coil is provided on the outer side of the stator 31. The rotor 32 is sleeved on the stator 31, a magnet suitable for the coil is provided on the inner side of the rotor 32, and the outer side of the rotor 32 is connected to the rotor 32 bearing seat; Figure 3It is an exploded view of a one-way bearing hub motor of the present application, in which an input ring 511 and an output ring 331 are shown. In combination with Figure 3 , an output ring 331 is provided in the middle of the rotor 32 bearing seat. The output ring 331 is sleeved on the outer ring of the one-way bearing 4, so that the stator 31 can drive the rotor 32 to drive the rotor 32 bearing seat to rotate around the central axis 2 through the coil, and thus power can be output outward through the output ring 331.

[0034] See Figure 2 and Figure 3 , the speed reduction and torque increase assembly 5 includes a sun gear 51, three planet gears 52, a planet carrier 54 and an external gear ring 53. The sun gear 51 is sleeved on the central axis 2, and an input ring 511 is provided on the side tooth surface of the sun gear 51 close to the rotor 32 bearing seat. The inner ring of the one-way bearing 4 is sleeved on the input ring 511. The one-way bearing 4 can be a one-way needle bearing; the external gear ring 53 is sleeved on the sun gear 51 and connected to the inner wall of the hub housing 1. The three planet gears 52 are equidistantly arranged between the external gear ring 53 and the sun gear 51 and are simultaneously meshed with both the external gear ring 53 and the sun gear 51. The rotating shafts of the respective planet gears 52 are all connected to the planet carrier 54, so that the respective planet gears 52 can be connected into a whole through the planet carrier 54; and the arrangement of the multiple planet gears 52 can increase the number of teeth meshed between the planet gears 52 and the sun gear 51 and the external gear ring 53, so that the operation of the speed reduction and torque increase assembly 5 is more stable and has strong shock resistance and vibration resistance.

[0035] Through the above settings, with the forward direction of the wheel as the positive direction, when the stator 31 drives the rotor 32 to rotate forward, the rotor 32 will drive the rotor 32 bearing seat and the output ring 331 to rotate forward together. At this time, the inner ring and the outer ring of the one-way bearing 4 will be locked, so that power can be transmitted to the input ring 511 through the one-way bearing 4, and the input ring 511 can be driven to rotate the sun gear 51, and then the power can be transmitted to the external gear ring 53 through the planet gears 52, so that the external gear ring 53 can drive the hub housing 1 to drive the wheel to rotate forward; when the wheel rotates reversely, the hub housing 1 will transmit the power to the sun gear 51 and the input ring 511 through the external gear ring 53 and the planet gears 52. At this time, the inner ring of the one-way bearing 4 can rotate freely in the outer ring and block the power transmission between the input ring 511 and the output ring 331, so as to avoid the situation that the motor is damaged because the rotor 32 is driven by the wheel to rotate reversely together; the setting of the one-way bearing 4 also makes it unnecessary to use a large-size one-way clutch in the hub motor, which not only makes the hub motor light in weight, but also makes the hub motor not need to reserve space in the casing for installing the one-way clutch, and the size is small.

[0036] See Figure 2 and Figure 3, the motor assembly 3 further includes a Hall plate 34 and a power cord 35. The Hall plate 34 is disposed on the stator 31. The Hall plate 34 can detect the position and speed of the rotor 32 and feedback the detection results to the vehicle controller electrically connected to the Hall plate 34, so as to facilitate the vehicle controller to control the one-way bearing hub motor. A wire routing hole leading to the inside of the hub housing 1 is formed in the shaft body of the central shaft 2 extending out of the hub housing 1. One end of the power cord 35 is provided with a plug 351. The other end of the power cord 35 passes through the wire routing hole and is connected to the stator 31 and the Hall plate 34, so that the one-way bearing hub motor can be connected to the power supply device and the controller on the vehicle through the plug 351 on the power cord 35, so that the power supply device can supply power to the stator 31 and the Hall plate 34 through the power cord 35, and the controller can be electrically connected to the Hall plate 34 through the power cord 35.

[0037] See Figure 1 and Figure 3 , both ends of the central shaft 2 are provided with chamfered thread sections 21 for connecting with the frame of the electric bicycle, so that the central shaft 2 can be threadedly connected to the frame of the electric bicycle through the chamfered thread sections 21, thereby improving the connection stability between the central shaft 2 and the frame; one side of the hub housing 1 is provided with a disc brake fixed end cover 11 for installing a disc brake, so as to be able to brake the wheel connected to the hub housing 1 through the disc brake.

[0038] The working principle of a one-way bearing hub motor of the present application during use is specifically as follows:

[0039] It includes a hub housing 1, a central shaft 2, a motor assembly 3, a one-way bearing 4 and a speed reduction and torque increase assembly 5. An installation hole is formed in the hub housing 1 along its rotation axis, and the central shaft 2 is inserted into the installation hole; the motor assembly 3 includes a stator 31, a rotor 32 and a rotor 32 bearing seat. The stator 31 can drive the rotor 32 to rotate. The rotor 32 is disposed on the rotor 32 bearing seat, and the rotor 32 bearing seat is sleeved on the outer ring of the one-way bearing 4; the power input end of the speed reduction and torque increase assembly 5 is drivingly connected to the inner ring of the one-way bearing 4, and the power output end of the speed reduction and torque increase assembly 5 is drivingly connected to the hub housing 1 and can drive the hub housing 1 to rotate around the central shaft 2, so that a large-size one-way clutch does not need to be used in the hub motor, which can not only make the hub motor light in weight, but also make the hub motor not need to leave a space for installing the one-way clutch in the casing, and the size is small.

[0040] It should be noted that the above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereby. Therefore, all equivalent changes made according to the structure, shape and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A one-way bearing hub motor, characterized in that: The invention comprises a wheel hub shell (1), a central shaft (2), a motor assembly (3), a one-way bearing (4) and a speed reduction and torque increase assembly (5); the wheel hub shell (1) is provided with a mounting hole along its rotation axis, and the central shaft (2) is inserted into the mounting hole; The motor assembly (3) comprises a stator (31), a rotor (32) and a rotor (32) bearing seat, wherein the stator (31) is capable of driving the rotor (32) to rotate, the rotor (32) is arranged on the rotor (32) bearing seat, and the rotor (32) bearing seat is sleeved on the outer ring of the one-way bearing (4); The power input end of the deceleration and torque-increasing assembly (5) is transmission-connected to the inner ring of the one-way bearing (4), and the power output end of the deceleration and torque-increasing assembly (5) is transmission-connected to the wheel hub shell (1) and is capable of driving the wheel hub shell (1) to rotate around the central axis (2).

2. The one-way bearing hub motor according to claim 1, characterized in that: The stator (31) is fixedly connected to the central shaft (2), and a coil is provided on the outside of the stator (31); The rotor (32) is sleeved on the stator (31), and a magnetic steel matching the coil is provided on the inner side of the rotor (32).

3. The one-way bearing hub motor according to claim 2, characterized in that: The deceleration and torque increasing assembly (5) comprises a sun gear (51), planetary gears (52) and an outer gear ring (53); the sun gear (51) is sleeved on the central shaft (2); an input ring (511) is provided on a wheel surface of the sun gear (51) on one side close to the bearing seat of the rotor (32); and the inner ring of the one-way bearing (4) is sleeved on the input ring (511); The outer gear ring (53) is sleeved on the sun gear (51) and connected to the inner wall of the hub shell (1); the planetary gear (52) is arranged between the outer gear ring (53) and the sun gear (51) and meshes with both the outer gear ring (53) and the sun gear (51).

4. The one-way bearing hub motor according to claim 3, characterized in that: The deceleration and torque-increasing assembly (5) further comprises a planet carrier (54), a plurality of planetary gears (52) are arranged between the outer gear ring (53) and the sun gear (51), and each of the planetary gears (52) is rotatably connected to the planet carrier (54).

5. The one-way bearing hub motor according to claim 1, characterized in that: The motor assembly (3) further comprises a Hall plate (34), wherein the Hall plate (34) is arranged on the stator (31).

6. The one-way bearing hub motor according to claim 5, characterized in that: The motor assembly (3) also includes a power cord (35); a shaft on the central axis (2) extending outside the hub shell (1) is provided with a wiring hole leading to the interior of the hub shell (1); one end of the power cord (35) is provided with a plug (351); the other end of the power cord (35) passes through the wiring hole to be connected to the stator (31) and the Hall plate (34).

7. The one-way bearing hub motor according to claim 1, characterized in that: Both ends of the central shaft (2) are provided with chamfered threaded sections (21) for connecting to the frame of an electric bicycle.

8. The one-way bearing hub motor according to claim 1, characterized in that: A disc brake fixing end cover (11) for mounting a disc brake is provided on one side of the wheel hub shell (1).

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