An electric wheelchair hub motor

Abstract

The present invention relates to an electric wheelchair hub motor, comprising: a housing, a wheel hub, a motor shaft, a stator, a rotor, a rotor fixing seat, and a brake assembly. The housing and wheel hub are both circumferentially rotatably mounted on the motor shaft; the brake assembly comprises an electromagnetic suction base, an elastic member, a push plate, a brake plate, and a limit plate. The motor shaft passes through the electromagnetic suction base, the push plate, the brake plate, the limit plate, and the rotor fixing seat in sequence from bottom to top. The electromagnetic suction base is fixedly connected to the motor shaft, the push plate is slidably connected to the electromagnetic suction base, the limit plate is fixedly connected to the electromagnetic suction base, the rotor fixing seat is circumferentially rotatably connected to the motor shaft, a connecting sleeve is provided on the inner side of the top of the rotor fixing seat, the connecting sleeve is mounted on the motor shaft, and the brake plate is slidably mounted on the connecting sleeve; the top of the rotor fixing seat and the wheel hub are in transmission engagement. By adopting this solution, the brake assembly is integrated into the motor, making the overall structure more compact and stable, and facilitating fixed installation.

Description

Technical Field

[0001] The present invention relates to the field of hub motors, and in particular to a hub motor for an electric wheelchair. Background Art

[0002] In-wheel hub motors are a common power device that omit numerous transmission components and boast a simple structure. Therefore, they are widely used in vehicles such as electric scooters and electric wheelchairs. In-wheel hub motors are often used in conjunction with external electromagnetic brakes, resulting in a complex and bulky overall structure. Installation on the vehicle is cumbersome, takes up a large space, and is inconvenient. Furthermore, the external location can lead to poor stability. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide an electric wheelchair hub motor, in which a brake assembly is combined in the motor, thereby making the overall structure more compact and stable, and facilitating fixed installation.

[0004] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0005] The cam is fixedly mounted on the wheel hub of the electric wheelchair, wherein the cam is secured to the wheel hub by means of a pin. The cam is secured to the wheel hub by means of a pin. The cam is secured to the wheel hub by means of a pin. The brake plate sliding sleeve is arranged on the connecting sleeve, and the brake plate and the connecting sleeve are circumferentially fixed, and the elastic member is installed between the electromagnetic suction base and the push plate, and under the action of the elastic member, the brake plate is clamped between the push plate and the limit plate; the stator is fixed on the electromagnetic suction base, and the rotor is fixed on the rotor fixing seat, and the rotor is located at the outer side of the stator, and the top of the rotor fixing seat and the wheel hub are transmission-engaged; it also includes a limit rod and a driving handle, a through hole is provided in the motor shaft, a strip hole is provided on the side of the motor shaft, the strip hole is located on one side of the push plate, and the strip hole and the through hole are connected, the limit rod slides and fits in the through hole, the driving handle is installed on the upper end of the motor shaft, and the driving handle can drive the limit rod to slide downward and be fixed, and a push block is provided at the bottom of the limit rod, and a groove is provided on the push plate, the push block passes through the strip hole, and the push block is inserted into the groove.

[0006] Preferably: it also includes a driving wheel, a driven wheel, a driven wheel fixing frame and a rack ring, the driving wheel is fixed to the top outer side of the rotor fixing seat, and the driving wheel is sleeved on the motor shaft, the driven wheel fixing frame is located above the driving wheel, and the driven wheel fixing frame and the motor shaft are circumferentially connected and axially fixed, the driven wheel is rotatably mounted on the driven wheel fixing frame, the rack ring is mounted on the inner wall of the wheel hub, the driven wheel is located between the driving wheel and the rack ring, and the driven wheel is respectively engaged with the driving wheel and the rack ring.

[0007] Preferably, a rotating shaft is provided on the driven wheel fixing frame, and the driven wheel is rotatably connected to the rotating shaft.

[0008] Preferably: it also includes a first bearing, a second bearing and a third bearing, the motor shaft passes through the first bearing, the second bearing and the third bearing, the housing is fixed on the first bearing, the rotor fixing seat is fixed on the second bearing, and the hub is fixed on the third bearing.

[0009] Preferably, the side surface of the connecting sleeve is polygonal, and the shape of the inner ring of the brake plate corresponds to the shape of the side surface of the connecting sleeve.

[0010] Preferably, when the brake assembly is in a braking state, the upper end of the limiting rod extends out of the upper end of the motor shaft, the driving handle is threadedly connected to the upper end of the motor shaft, and the upper end of the limiting rod is in contact with the driving handle.

[0011] The beneficial effects of the present invention are as follows: when the hub motor is operating normally, the electromagnetic suction base overcomes the elastic force of the elastic member to absorb the push plate, so that the push plate does not apply thrust to the brake plate. Under the cooperation of the rotor and the stator, the rotor fixing seat rotates, and the rotation of the rotor fixing seat drives the rotation of the wheel hub; when braking is needed, the electromagnetic suction base disconnects the suction force on the push plate, and the elastic member applies elastic force to the push plate, causing the brake plate to be clamped between the push plate and the limit plate. The brake plate slowly stops rotating due to the friction force. Since the brake plate and the connecting sleeve are circumferentially fixed, the stopping of the brake plate will cause the rotor fixing seat to stop. Stop rotation. Due to the transmission cooperation between the top of the rotor fixing seat and the wheel hub, the wheel hub stops rotating, thereby stopping the hub motor from working. In this hub motor, the brake assembly is combined in the accommodating cavity formed by the shell and the wheel hub. The parts in the brake assembly are arranged in order, and the cooperation with other parts makes full use of the space in the accommodating cavity, making the overall structure more compact and stable, and convenient for fixed installation. In addition, when braking, the brake plate is clamped between the push plate and the limit plate, and both sides of the brake plate are subjected to friction. Compared with the single-sided force in the existing technology, the braking effect is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0013] Figure 1 A cross-sectional view of an embodiment of the electric wheelchair hub motor of the present invention;

[0014] Figure 2 An exploded view of an embodiment of the electric wheelchair hub motor of the present invention;

[0015] Figure 3 This is a schematic structural diagram of an embodiment of the electric wheelchair hub motor of the present invention;

[0016] Figure 4 Schematic diagram of the structure of the limiting rod in the embodiment;

[0017] Figure 5 Schematic diagram of the structure of the motor shaft in the embodiment;

[0018] Figure 6 This is a partial structural diagram of an embodiment of the electric wheelchair hub motor of the present invention;

[0019] Figure 7 A schematic structural diagram of a connecting sleeve in an embodiment;

[0020] Figure 8 Schematic diagram of the structure of the push plate in the embodiment;

[0021] Figure 9 is an exploded view of a brake assembly in an embodiment;

[0022] Figure 10 Schematic diagram of the structure of the brake assembly in the embodiment;

[0023] Figure 11 Schematic diagram of the structure of the brake plate in the embodiment.

[0024] in:

[0025] 1. Casing;

[0026] 2. Wheel hub;

[0027] 3. Motor shaft; 31. Strip hole;

[0028] 4. Stator;

[0029] 5. Rotor;

[0030] 6. Rotor fixing seat; 61. Connecting sleeve;

[0031] 7. Electromagnetic suction base;

[0032] 8. Elastic parts;

[0033] 9. Push plate; 91. Groove;

[0034] 10. Brake pedal;

[0035] 11. Limit plate;

[0036] 12. Driving wheel;

[0037] 13. driven wheel; 131. rotating shaft;

[0038] 14. Driven wheel fixing frame;

[0039] 15. Rack ring;

[0040] 16. First bearing;

[0041] 17. Second bearing;

[0042] 18. Third bearing;

[0043] 19. Limit rod; 191. Push block;

[0044] 20. Driving handle. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0046] In the description of the present invention, it should be understood that the directions and positional relationships indicated by “up”, “down”, “left”, “right”, “front”, “back”, “vertical”, “bottom”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0047] like Figures 1 to 11 As shown,

[0048] An electric wheelchair hub motor comprises: a housing 1, a wheel hub 2, a motor shaft 3, a stator 4, a rotor 5, a rotor fixing seat 6 and a brake assembly. The housing 1 and the wheel hub 2 are both circumferentially rotatably mounted on the motor shaft 3, and the housing 1 and the wheel hub 2 are both fixed to the motor shaft 3. The housing 1 and the wheel hub 2 are connected and spliced ​​to form an accommodating cavity, which is in a closed state. The rotor fixing seat 6, the brake assembly, the rotor 5 and the stator 4 are all installed in the accommodating cavity; the brake assembly comprises an electromagnetic suction base 7, an elastic member 8, a push plate 9, a brake plate 10 and a limit plate 11. The motor shaft 3 passes through the electromagnetic suction base 7, the push plate 9, the brake plate 10, the limit plate 11 and the rotor fixing seat 6 from bottom to top, and the electromagnetic suction base 7 is fixedly connected to the motor shaft 3. The push plate 9 and the electromagnetic suction base are fixedly connected to the motor shaft 3. The base 7 is axially slidingly connected, the limit plate 11 is fixedly connected to the electromagnetic base 7, the rotor fixing base 6 and the motor shaft 3 are circumferentially rotatingly connected and axially fixed, a connecting sleeve 61 is provided on the top inner side of the rotor fixing base 6, the connecting sleeve 61 is sleeved on the motor shaft 3, the brake plate 10 is slidingly sleeved on the connecting sleeve 61, and the brake plate 10 and the connecting sleeve 61 are circumferentially fixed, the elastic member 8 is installed between the electromagnetic base 7 and the push plate 9, under the action of the elastic member 8, the brake plate 10 is clamped between the push plate 9 and the limit plate 11, the elastic member 8 is a spring; the stator 4 is fixed on the electromagnetic base 7, the rotor 5 is fixed on the rotor fixing base 6, and the rotor 5 is located on the outside of the stator 4, and the top of the rotor fixing base 6 and the wheel hub 2 are transmission-matched.

[0049] In this way, when the hub motor is operating normally, the electromagnetic suction base 7 overcomes the elastic force of the elastic member 8 to attract the push plate 9, so that the push plate 9 does not apply thrust to the brake plate 10. With the cooperation of the rotor 5 and the stator 4, the rotor fixing seat 6 rotates, and the rotation of the rotor fixing seat 6 drives the rotation of the wheel hub 2; when braking is needed, the electromagnetic suction base 7 disconnects the suction force on the push plate 9, and the elastic member 8 applies elastic force to the push plate 9, causing the brake plate 10 to be clamped between the push plate 9 and the limit plate 11. The brake plate 10 slowly stops rotating due to the friction force. Since the brake plate 10 and the connecting sleeve 61 are circumferentially fixed, the stopping of the brake plate 10 will cause the rotor The sub-fixing seat 6 stops rotating, and due to the transmission cooperation between the top of the rotor fixing seat 6 and the wheel hub 2, the wheel hub 2 stops rotating, thereby causing the hub motor to stop working; in this hub motor, the brake assembly is combined in the accommodating cavity formed by the shell 1 and the wheel hub 2, the parts in the brake assembly are arranged in order, and the cooperation with other parts makes full use of the space in the accommodating cavity, making the overall structure more compact and stable, and convenient for fixed installation; in addition, when braking, the brake plate 10 is clamped between the push plate 9 and the limit plate 11, and both sides of the brake plate 10 are subjected to friction. Compared with the single-sided force in the prior art, the braking effect is better.

[0050] In addition, such as Figure 1 and Figure 6 As shown, it also includes a driving wheel 12, a driven wheel 13, a driven wheel fixing frame 14 and a rack ring 15. The driving wheel 12 is fixed to the top outer side of the rotor fixing seat 6, and the driving wheel 12 is sleeved on the motor shaft 3. The driven wheel fixing frame 14 is located above the driving wheel 12, and the driven wheel fixing frame 14 and the motor shaft 3 are circumferentially connected and axially fixed. The driven wheel 13 is rotatably mounted on the driven wheel fixing frame 14, and the rack ring 15 is mounted on the inner wall of the hub 2. The driven wheel 13 is located between the driving wheel 12 and the rack ring 15, and the driven wheel 13 is meshed with the driving wheel 12 and the rack ring 15 respectively.

[0051] In this way, the rotation of the rotor fixing seat 6 drives the rotation of the driving wheel 12, the driving wheel 12 drives the rotation of the driven wheel 13, the driven wheel 13 drives the rotation of the rack ring 15, and the rack ring 15 drives the rotation of the hub 2, thereby realizing the reduction transmission between the rotor fixing seat 6 and the hub 2.

[0052] In addition, such as Figure 6 As shown, a rotating shaft 131 is provided on the fixed frame of the driven wheel 13, and the driven wheel 13 and the rotating shaft 131 are rotatably connected.

[0053] In this way, the rotation installation of the driven wheel 13 is achieved.

[0054] In addition, such as Figure 1As shown, it also includes a first bearing 16, a second bearing 17 and a third bearing 18. The motor shaft 3 passes through the first bearing 16, the second bearing 17 and the third bearing 18. The housing 1 is fixed on the first bearing 16, the rotor fixing seat 6 is fixed on the second bearing 17, and the hub 2 is fixed on the third bearing 18.

[0055] In this way, under the action of the first bearing 16 , the second bearing 17 and the third bearing 18 , the housing 1 , the rotor fixing seat 6 and the hub 2 are subjected to less resistance during rotation, and the rotation is smoother.

[0056] In addition, the side surface of the connecting sleeve 61 is a polygon, such as a regular hexagon, and the shape of the inner ring of the brake plate 10 corresponds to the shape of the side surface of the connecting sleeve 61 .

[0057] In this way, the rotation of the connecting sleeve 61 can drive the rotation of the brake plate 10 .

[0058] In addition, such as Figure 1 and Figure 4 As shown, it also includes a limit rod 19 and a driving handle 20. A through hole is provided in the motor shaft 3, and a strip hole 31 is provided on the side of the motor shaft 3. The strip hole 31 is located on one side of the push plate 9, and the strip hole 31 and the through hole are connected. The limit rod 19 slides in the through hole, and the driving handle 20 is installed at the upper end of the motor shaft 3, and the driving handle 20 can drive the limit rod 19 to slide downward and be fixed. A push block 191 is provided at the bottom of the limit rod 19, and a groove 91 is provided on the push plate 9. The push block 191 passes through the strip hole 31 and is inserted into the groove 91.

[0059] In this way, if the hub motor is in a power-off state due to a fault when used outdoors, the electromagnetic suction base 7 cuts off the suction force on the push plate 9. Under the action of the elastic member 8, the brake plate 10 is clamped between the push plate 9 and the limit plate 11, and the wheel hub 2 cannot rotate, making it inconvenient to carry the vehicle installed with the hub motor because it cannot rotate. At this time, it is only necessary to operate the driving handle. The driving handle 20 drives the limit rod 19 to slide downward and fix it. The sliding of the limit rod 19 causes the push block 192 to push the push plate 9 to slide, and the brake plate 10 loses its grip. After the push plate 9 is pushed, the extrusion pressure on both sides of the brake plate 10 disappears, and the brake plate 10 no longer has a braking effect and can be rotated at will, so that the hub motor can be rotated at will, and the corresponding vehicle can move under human action. For example, when the hub motor is installed on an electric wheelchair, if the electric wheelchair loses power due to a fault and the hub motor is locked, the hub motor can be rotated freely by rotating the limit rod 19, and the electric wheelchair can be moved with the help of manpower instead of being stuck in place due to a fault, causing inconvenience.

[0060] In addition, when the brake assembly is in the braking state, the upper end of the limit rod 19 extends out of the upper end of the motor shaft 3, the driving handle 20 and the upper end of the motor shaft 3 are threadedly connected, and the upper end of the limit rod 19 is in contact with the driving handle 20.

[0061] In this way, by rotating the driving handle 20 , the driving handle 20 will slide in the axial direction, thereby driving the limiting rod 19 to slide.

[0062] In addition, in order to achieve the effect that the driving handle 20 can drive the limit rod 19 to slide downward and be fixed, in addition to the above scheme, a push rod can be set at the bottom of the driving handle 20, and the driving handle 20 is also threadedly connected to the upper end of the motor shaft 3. The push rod is inserted into the through hole and contacts the top of the limit rod 19. In this way, the rotation of the driving handle 20 will prompt the push rod to push the limit rod 19 to slide; in addition, the driving handle 20 and the upper end of the motor shaft 3 can be slidably connected, and a spring can be set between the driving handle 20 and the motor shaft 3. The upper end of the limit rod 19 extends out of the upper end of the motor shaft 3, and the upper end of the limit rod 19 contacts the driving handle 20. A limit protrusion is provided on the driving handle 20, and a guide groove is provided on the motor shaft 3. The limit protrusion fits in the guide groove, and the two ends of the guide groove are one high and one low. Therefore, by sliding and rotating the driving handle 20, the limit protrusion moves from the high end to the low end and is positioned there under the action of the elastic member, and the axial position of the driving handle 20 changes, thereby prompting the driving handle 20 to drive the limit rod 19 to slide and be fixed.

[0063] In short, the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An electric wheelchair hub motor, characterized in that: include: The cam is fixed to the chassis and the motor is mounted on the chassis, and the cam is fixed to the chassis and the motor. The cam is fixed to the upper end of the driving member and the lower end of the driving member is fixed with a toothed structure, and the toothed structure is fixed with a toothed structure on the upper end of the driving member and the toothed structure is fixed with a toothed structure on the lower end of the driving member.

2. The electric wheelchair hub motor according to claim 1, characterized in that: The gear train comprises a plurality of gears, a plurality of gears, a plurality of gears, a plurality of gears, a plurality of gears, a plurality of gears, and a plurality of gears. The plurality of gears are connected to each other in a circular motion by a plurality of gears. The plurality of gears are connected to each other in a circular motion by a plurality of gears. The plurality of gears are connected to each other in a circular motion by a plurality of gears. The plurality of gears are connected to each other in a circular motion by a plurality of gears.

3. The electric wheelchair hub motor according to claim 2, characterized in that: The driven wheel fixing frame is provided with a rotating shaft, and the driven wheel is rotatably connected to the rotating shaft.

4. The electric wheelchair hub motor according to claim 1, characterized in that: It also includes a first bearing, a second bearing and a third bearing. The motor shaft passes through the first bearing, the second bearing and the third bearing. The housing is fixed on the first bearing, the rotor fixing seat is fixed on the second bearing, and the hub is fixed on the third bearing.

5. The electric wheelchair hub motor according to claim 1, characterized in that: The side surface of the connecting sleeve is polygonal, and the shape of the inner ring of the brake plate corresponds to the shape of the side surface of the connecting sleeve.

6. The electric wheelchair hub motor according to any one of claims 1 to 5, characterized in that: When the brake assembly is in a braking state, the upper end of the limiting rod extends out of the upper end of the motor shaft, the driving handle is threadedly connected to the upper end of the motor shaft, and the upper end of the limiting rod contacts the driving handle.

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