Hub motor with power-off braking function

Abstract

The utility model discloses a wheel hub motor with a power-off braking function, which comprises a motor stator, a motor rotor, a movable friction plate and a braking assembly, and is characterized in that the motor stator is at least used for driving the motor rotor to rotate when being electrified; the motor rotor is driven by the motor stator to rotate, and the motor rotor is at least used for driving the hub to rotate; the multiple movable friction plates are arranged at intervals, the movable friction plates are arranged on the inner side of the motor rotor, and the distance between every two adjacent movable friction plates can be adjusted; the brake assembly is used for reducing the distance between the two adjacent dynamic friction plates when the motor loses power, so that the dynamic friction force is locked and rotation is stopped. The brake assembly can brake the hub when the motor loses power, and sliding caused by sudden power loss of vehicles such as an electric wheelchair in the ramp walking process is prevented. Braking is achieved through the multi-piece type friction plates, the friction area is large, and the needed pushing force is small, namely the needed power is small.

Description

Technical Field

[0001] The utility model relates to a hub motor with a power-off braking function, belonging to the technical field of motors. Background Art

[0002] In-wheel motors are designed to integrate the vehicle's power system, transmission system, and braking system. However, existing in-wheel motors do not have a power-off braking function. When power suddenly fails while driving on a slope, the vehicle may slip. For example, if an electric wheelchair suddenly loses power while driving on a slope, it may cause the wheelchair to slip and roll over, posing a safety hazard to the user. Utility Model Content

[0003] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a hub motor with a braking function in the event of power failure, a compact structure and high power utilization.

[0004] In order to achieve the above-mentioned purpose of the utility model, the technical solutions adopted by the utility model include:

[0005] A hub motor with a power-off braking function comprises a motor stator, a motor rotor, a dynamic friction plate and a brake assembly, wherein the motor stator is used to drive the motor rotor to rotate at least when power is supplied; the motor rotor rotates under the drive of the motor stator, and the motor rotor is used to drive the wheel hub to rotate; a plurality of dynamic friction plates are provided and the plurality of dynamic friction plates are arranged at intervals, the dynamic friction plates are arranged on the inner side of the motor rotor, and the distance between two adjacent dynamic friction plates is adjustable; the brake assembly is used to reduce the distance between two adjacent dynamic friction plates when the motor loses power so that the dynamic friction force is locked to stop the rotation.

[0006] Furthermore, the brake assembly includes a static friction plate, which is arranged between two adjacent dynamic friction plates. The brake assembly also includes a guide pin, a pressure plate, a spring and an electromagnet. When the motor loses power, the electromagnetic force disappears, and under the action of the spring force, the pressure plate moves toward the dynamic friction plate, thereby driving the dynamic friction plate and the static friction plate to move, so that the dynamic friction plate and the static friction plate are in close contact, so that the dynamic friction plate stops rotating.

[0007] Furthermore, a fixed seat is provided on one side of the static friction plate, a plurality of first placement grooves are provided on the inner side wall of the fixed seat, and a plurality of first protrusions are provided on each of the static friction plates, the positions of the first protrusions correspond to the positions of the first placement grooves and the shapes of the first protrusions are consistent or similar to those of the first placement grooves, and the first protrusions move along the axial direction of the fixed seat along the first placement grooves.

[0008] Furthermore, a stopper is provided on a side of the fixing seat away from the guide pin, and the stopper is at least used to block the static friction plate close to the stopper so that the dynamic friction plate and the static friction plate are squeezed together.

[0009] Furthermore, a plurality of second bosses are provided on the outer side of the motor rotor, and a plurality of second grooves are provided on the dynamic friction plate. The positions of the second grooves correspond to those of the second bosses, and the shapes of the second grooves and the second bosses are consistent or similar, and the second grooves move along the second bosses.

[0010] Furthermore, a connecting seat is provided on the side of the fixed seat away from the stop block, and a second placement groove is provided on the connecting seat at a position corresponding to the guide pin. When the motor loses power, the guide pin extends to drive the pressure plate to push the dynamic friction plate and the static friction plate, so that the dynamic friction plate and the static friction plate are squeezed together to stop the static friction plate from rotating.

[0011] Furthermore, a switch is provided on one side of the connecting seat, and the switch is at least used for releasing the brake.

[0012] Furthermore, the fixed end of the switch is fixedly connected to the connecting seat; the driving end of the switch is fixedly connected to the pressure plate, and the switch includes a handle, and the rotating part of the handle is cam-shaped.

[0013] Furthermore, a tire is provided on the outer side of the wheel hub.

[0014] Furthermore, a mounting hole is provided on the side of the wheel hub away from the switch, and a shock absorbing ring is provided in the mounting hole.

[0015] Compared with the prior art, the advantages of the present invention include:

[0016] 1) The present invention provides a hub motor with a power-off braking function. The brake assembly can brake the hub when the motor loses power, preventing electric wheelchairs and other vehicles from slipping due to sudden power loss while traveling on a slope.

[0017] 2) The utility model provides a hub motor with a power-off braking function, which uses a multi-plate friction plate to achieve braking, with a large friction area and requires a small driving force, that is, a small power;

[0018] 3) The utility model provides a hub motor with a power-off braking function. When the vehicle needs to be pushed after power failure, the brake can be released by flipping a switch. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments recorded in this application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 This is a schematic diagram of the overall structure of a hub motor with a power-off braking function provided in a typical implementation case of the utility model;

[0021] Figure 2 This is a front view of a hub motor with a power-off braking function provided in a typical embodiment of the present invention;

[0022] Figure 3 It is a cross-sectional view of AA;

[0023] Figure 4 This is a schematic diagram of the positions of the dynamic friction plate and the static friction plate provided in a typical embodiment of the present invention;

[0024] Figure 5 This is a schematic structural diagram of a motor rotor provided in a typical embodiment of the present invention;

[0025] Figure 6 This is a schematic structural diagram of a static friction plate provided in a typical embodiment of the present invention;

[0026] Figure 7 This is a schematic structural diagram of a fixing base provided in a typical implementation case of the present utility model;

[0027] Figure 8 This is a schematic structural diagram of a dynamic friction plate provided in a typical embodiment of the present invention;

[0028] Explanation of the accompanying drawings: 1. Motor rotor; 2. Dynamic friction plate; 3. Static friction plate; 4. Guide pin; 5. Pressure plate; 6. Fixed seat; 7. First placement groove; 8. First protrusion; 9. Stop block; 10. Second boss; 11. Second groove; 12. Connecting seat; 14. Switch; 15. Tire; 16. Mounting hole; 17. Shock absorber ring; 18. Wheel hub. DETAILED DESCRIPTION

[0029] In view of the shortcomings of the existing technology, the inventors of this case, after long-term research and extensive practice, have proposed the technical solution of this utility model. The following will further explain this technical solution, its implementation process and principles.

[0030] The utility model discloses a hub motor with power-off braking function. Figure 2 、 Figure 3 As shown, the hub motor with power-off braking function includes a motor stator, a motor rotor 1, a dynamic friction plate 2, and a brake assembly. The motor stator is used to drive the motor rotor 1 to rotate at least when energized. The motor rotor 1 rotates under the drive of the motor stator, and the motor rotor 1 is used to drive at least the wheel hub 18 to rotate. The dynamic friction plates 2 are provided in multiples and are spaced apart. The dynamic friction plates 2 are arranged on the inner side of the motor rotor 1, and the distance between two adjacent dynamic friction plates 2 is adjustable. The brake assembly is used to reduce the distance between two adjacent dynamic friction plates when the motor loses power so that the dynamic friction force locks and stops rotation. The brake assembly of the utility model can brake the wheel hub 18 when the motor loses power, preventing vehicles such as electric wheelchairs from slipping due to sudden power loss while traveling on a slope. The utility model uses multi-plate friction plates to achieve braking, which has a large friction area and requires less driving force, that is, less power.

[0031] Specifically, such as Figure 3 、 Figure 4 As shown, the brake assembly includes a static friction plate 3, which is positioned between two adjacent dynamic friction plates 2. The brake assembly also includes a guide pin 4, a pressure plate 5, a spring, and an electromagnet. When the motor is powered off, the electromagnetic force disappears. Under the action of the spring force, the pressure plate 5 moves toward the dynamic friction plate 2, thereby driving the dynamic friction plate 2 and the static friction plate 3 to move, so that the dynamic friction plate 2 and the static friction plate 3 are in close contact, and the dynamic friction plate 2 stops rotating. More specifically, the guide pin 4 is provided with a spring. When the motor is powered on, the guide pin 4 retracts under the electromagnetic force of the electromagnetic induction coil, allowing the dynamic friction force to rotate normally, that is, the wheel hub 18 can rotate normally. When the motor is powered off, the electromagnetic force disappears, the guide pin 4 extends, and drives the pressure plate 5 to squeeze the static friction plate 3 and the dynamic friction plate 2, so that the dynamic friction plate 2 and the static friction plate 3 come into contact, until the static friction plate 3 stops rotating. Since the static friction plate 3 is connected to the motor rotor 1, and the motor rotor 1 is connected to the wheel hub 18, the wheel hub 18 stops rotating when the static friction plate 3 stops rotating. For greater safety, the friction plates at both ends of the connecting seat 12 are static friction plates 3 .

[0032] On the basis of the above, if Figure 6 、 Figure 7As shown, a fixing seat 6 is provided on one side of the static friction plate 3, and a plurality of first placement grooves 7 are provided on the inner side wall of the fixing seat 6. A plurality of first protrusions 8 are provided on each of the static friction plates 3. The positions of the first protrusions 8 correspond to the positions of the first placement grooves 7 and the shapes of the first protrusions 8 and the first placement grooves 7 are consistent or similar. The first protrusions 8 move along the axial direction of the fixing seat 6 along the first placement grooves 7. A stopper 9 is provided on the side of the fixing seat 6 away from the guide pin 4. The stopper 9 is used to at least block the static friction plate 3 close to the stopper 9, so that the dynamic friction plate 2 and the static friction plate 3 are squeezed together. Figure 5 As shown, a plurality of second bosses 10 are provided on the outer side of the motor rotor 1. Figure 8 As shown, the dynamic friction plate 2 is provided with a plurality of second grooves 11. The second grooves 11 correspond to the positions of the second bosses 10, and the second grooves 11 and the second bosses 10 have the same or similar shapes. The second grooves 11 move along the second bosses 10. When the motor loses power, the guide pin 4 extends, squeezing the static friction plate 3 and the dynamic friction plate 2. Since the fixed seat 6 is provided with a stopper 9, the dynamic friction plate 2 near the stopper 9 remains stationary, while the remaining dynamic friction plates 2 move along the second bosses 10 toward the stopper 9. Simultaneously, the static friction plate 3 moves along the first placement groove 7 toward the baffle until the static friction plate 3 and the dynamic friction plate 2 are squeezed together, the static friction plate 3 stops rotating, and the wheel hub 18 stops rotating.

[0033] In some preferred embodiments, Figure 3 As shown, a connecting seat 12 is provided on the side of the fixing seat 6 away from the stopper. A second placement slot is provided on the connecting seat 12 at a position corresponding to the guide pin 4. When the motor loses power, the guide pin 4 extends to drive the pressure plate 5 to push the dynamic friction plate 2 and the static friction plate 3, squeezing them together to stop the rotation of the static friction plate 3. The wheel hub 18 is rotatably connected to the connecting seat 12 via a bearing.

[0034] In some preferred embodiments, Figure 3 、 Figure 4As shown, a switch 14 is provided on one side of the connecting base 12, and the switch 14 is used to release the brake at least. When the motor loses power and the vehicle (such as a wheelchair) needs to be pushed, the wheel hub 18 needs to be able to rotate, so the brake needs to be released manually by using the switch 14. More specifically, the fixed end of the switch 14 is fixedly connected to the connecting base 12; the driving end of the switch 14 is fixedly connected to the pressure plate 5. The switch 14 includes a handle, and the rotating portion of the handle is cam-shaped. When the brake is required, the handle is pulled upward. At this time, the driving end of the handle drives the pressure plate 5 to move away from the dynamic friction plate 2, so that the pressure plate 5 does not squeeze the dynamic friction plate 2. The gap between the dynamic friction plate 2 and the static friction plate 3 becomes larger, and the static friction plate 3 can rotate. At the same time, the wheel hub 18 can rotate, and the vehicle (such as a wheelchair) can be pushed.

[0035] Based on the above, a tire 15 is provided on the outside of the wheel hub 18. A mounting hole 16 is provided on the side of the wheel hub 18 away from the switch 14. The wheel hub motor is connected to the vehicle frame through the mounting hole 16. A shock-absorbing ring 17 is provided in the mounting hole 16 to reduce vibration of the vehicle frame and improve user comfort.

[0036] It should be understood that the above embodiments are merely illustrative of the technical concepts and features of the present invention. Their purpose is to enable those familiar with the art to understand the contents of the present invention and implement them accordingly. They are not intended to limit the scope of protection of the present invention. Any equivalent changes or modifications based on the spirit of the present invention are intended to fall within the scope of protection of the present invention.

Claims

1. A hub motor with power-off braking function, characterized by: include A motor stator, the motor stator being used to drive the motor rotor (1) to rotate at least when powered; A motor rotor (1), the motor rotor (1) being driven by the motor stator to rotate, and the motor rotor (1) being used at least to drive the wheel hub to rotate; A wheel hub (18), wherein the wheel hub (18) is connected to the motor rotor, and the motor rotor rotates to drive the wheel hub (18) to rotate; A dynamic friction plate (2), wherein a plurality of the dynamic friction plates (2) are provided and the plurality of dynamic friction plates (2) are arranged at intervals, the dynamic friction plates (2) are arranged on the inner side of the motor rotor (1), and the distance between two adjacent dynamic friction plates (2) is adjustable; The brake assembly is used to reduce the distance between two adjacent dynamic friction plates when the motor loses power so that the dynamic friction force is locked to stop the rotation.

2. The in-wheel motor with power-off braking function according to claim 1, characterized in that: The brake assembly includes a static friction plate (3), which is arranged between two adjacent dynamic friction plates (2). The brake assembly also includes a guide pin (4), a pressure plate (5), a spring and an electromagnet. When the motor loses power, the electromagnetic force disappears. Under the action of the spring force, the pressure plate (5) moves toward the dynamic friction plate (2), thereby driving the dynamic friction plate (2) and the static friction plate (3) to move, so that the dynamic friction plate (2) and the static friction plate (3) are in close contact with each other, so that the dynamic friction plate (2) stops rotating.

3. The in-wheel motor with power-off braking function according to claim 2, characterized in that: A fixing seat (6) is provided on one side of the static friction plate (3), a plurality of first placement grooves (7) are provided on the inner side wall of the fixing seat (6), and a plurality of first protrusions (8) are provided on each of the static friction plates (3). The positions of the first protrusions (8) and the first placement grooves (7) correspond to each other, and the shapes of the first protrusions (8) and the first placement grooves (7) are consistent or similar, and the first protrusions (8) move along the first placement grooves (7).

4. The in-wheel motor with power-off braking function according to claim 3, characterized in that: A stopper (9) is provided on the side of the fixing seat (6) away from the guide pin (4), and the stopper (9) is at least used to block the static friction plate (3) on the side close to the stopper (9) so that the dynamic friction plate (2) and the static friction plate (3) are squeezed together.

5. The in-wheel motor with power-off braking function according to claim 1, characterized in that: A plurality of second bosses (10) are provided on the outer side of the motor rotor (1), and a plurality of second grooves (11) are provided on the dynamic friction plate (2), wherein the second grooves (11) correspond to the positions of the second bosses (10), and the second grooves (11) and the second bosses (10) have the same or similar shapes, and the second grooves (11) move along the second bosses (10).

6. The in-wheel motor with power-off braking function according to claim 3, characterized in that: A connecting seat (12) is provided on a side of the fixing seat (6) away from the stop block, and a second placement groove is provided on the connecting seat (12) at a position corresponding to the guide pin (4). When the motor loses power, the guide pin (4) extends to drive the pressure plate (5) to push the dynamic friction plate (2) and the static friction plate (3), so that the dynamic friction plate and the static friction plate are squeezed together, so that the static friction plate (3) stops rotating.

7. The in-wheel motor with power-off braking function according to claim 6, characterized in that: A switch (14) is provided on one side of the connecting seat (12), and the switch (14) is at least used for releasing the brake.

8. The in-wheel motor with power-off braking function according to claim 7, characterized in that: The fixed end of the switch (14) is fixedly connected to the connecting seat (12); the driving end of the switch (14) is fixedly connected to the pressing plate (5); the switch (14) includes a handle, and the rotating part of the handle is cam-shaped.

9. The in-wheel motor with power-off braking function according to claim 1, characterized in that: A tire (15) is provided on the outer side of the wheel hub.

10. The in-wheel motor with power-off braking function according to claim 1, characterized in that: A mounting hole (16) is provided on a side of the wheel hub away from the switch (14), and a shock-absorbing ring (17) is provided in the mounting hole (16).

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