Magnetic speed reduction hub motor

Abstract

The utility model belongs to the technical field of power-assisted bicycles, and particularly relates to a magnetic speed reduction hub motor. In order to overcome the defect that an existing hub motor adopting a magnetic speed reducer is not reasonable in structure, the magnetic speed reduction hub motor adopts the following technical scheme that the magnetic speed reduction hub motor comprises a machine shell assembly, a magnetic speed reducer assembly and a magnetic speed reducer assembly, a motor stator assembly; a motor rotor assembly; the high-speed rotor assembly rotates synchronously with the motor rotor assembly and comprises a high-speed rotor permanent magnet array; the low-speed rotor assembly is located on the radial outer side of the high-speed rotor assembly, fixedly connected with the hub and comprises a low-speed rotor permanent magnet array; a modulation component; a motor shaft; the high-speed rotor assembly and the low-speed rotor assembly are configured to have different pole pair numbers, under the action of the modulation assembly, the magnetic field of the first air gap is coupled with the magnetic field of the second air gap, and rotation from the high-speed rotor assembly is output by the low-speed rotor assembly in a decelerated mode. The utility model has the beneficial effects that the structure is optimized, and the efficiency is high; the overall structure is compact.

Description

Technical Field

[0001] The utility model belongs to the technical field of electric bicycles, and in particular relates to a magnetic reduction hub motor. Background Art

[0002] E-bikes currently available on the market are primarily categorized as those with traditional hub motors and mid-mount motors. Mid-mount motors are mounted in the center of the frame, transmitting power to the rear wheel via a chain or belt. Mid-mount motors offer several advantages: Mounting them centrally in the frame balances the vehicle's front-to-rear center of gravity, improving driving stability. Compared to hub motors, mid-mount motors offer greater torque and utilize air or oil cooling, resulting in faster acceleration and greater climbing power. Furthermore, the mid-mount motor layout eliminates rear wheel space, allowing for flexible rear wheel hub designs.

[0003] Existing in-wheel motors often utilize multi-gear or planetary gear transmissions, resulting in large size, low transmission efficiency, and a square appearance, requiring a decorative cover to complement the vehicle. To address this, in-wheel motors utilizing magnetic reducers have emerged. However, these introduce new challenges, such as: 1. An inadequate structure for the magnetic reducer; 2. Inadequate connections and assembly between the magnetic reducer and other components of the in-wheel motor.

[0004] In addition, the applicant disclosed a magnetic transmission reduction device and a mid-mounted motor for a power-assisted bicycle using the magnetic transmission reduction device in CN118554721A, but did not disclose how the magnetic transmission reduction device can be applied to a hub motor. Summary of the Invention

[0005] Aiming at the shortcomings of the existing hub motor adopting a magnetic reducer that the structure is not entirely reasonable, the utility model provides a magnetic reduction hub motor and improves the relevant structure.

[0006] To achieve the above-mentioned purpose, the present invention adopts the following technical solution: a magnetic reduction hub motor, comprising:

[0007] housing assembly, including hub sleeve;

[0008] The motor stator assembly is fixed in the wheel hub sleeve;

[0009] The motor rotor assembly is located radially inward of the motor stator assembly;

[0010] a high-speed rotor assembly, which rotates synchronously with the motor rotor assembly and includes a high-speed rotor permanent magnet array;

[0011] The low-speed rotor assembly is located radially outside the high-speed rotor assembly, is fixedly connected to the hub sleeve, and includes a low-speed rotor permanent magnet array;

[0012] The modulation assembly is located between the high-speed rotor assembly and the low-speed rotor assembly, and maintains a first air gap with the high-speed rotor assembly and a second air gap with the high-speed rotor assembly;

[0013] The motor shaft is fixed at the center of the magnetic reduction hub motor;

[0014] Among them, the high-speed rotor assembly and the low-speed rotor assembly are configured with different pole pairs. Under the action of the modulation assembly, the magnetic field of the first air gap is coupled with the magnetic field of the second air gap, and the rotation from the high-speed rotor assembly is decelerated and output by the low-speed rotor assembly.

[0015] The magnetic reduction hub motor of the utility model includes a casing assembly, a motor stator assembly, a motor rotor assembly, a high-speed rotor assembly, a low-speed rotor assembly, a modulation assembly, and a motor shaft. The high-speed rotor assembly, the low-speed rotor assembly, and the modulation assembly form a magnetic reducer, so that the hub motor has the speed reduction and torque increase capability of traditional mechanical gears, and also has the overload protection capability that traditional mechanical gear reducers do not have; the overall structure is compact.

[0016] As an improvement, the motor rotor assembly and the high-speed rotor assembly rotate at the same speed through the meshing of internal and external teeth.

[0017] As an improvement, the high-speed rotor assembly also includes a high-speed rotor shaft, which forms an external tooth portion axially close to one end of the motor rotor assembly, and the motor rotor assembly forms an internal tooth portion axially close to one end of the high-speed rotor assembly. The high-speed rotor permanent magnet array includes multiple permanent magnets distributed circumferentially and two circular rings, and each permanent magnet has a notch formed at both axial ends, and the two circular rings are located in the notch.

[0018] As an improvement, the modulation component includes a squirrel cage with multiple mounting grooves distributed in an annular manner, modulation teeth and modulation end rings arranged in the mounting grooves, and a positioning structure is formed between the modulation end ring and the squirrel cage.

[0019] As a modification, the squirrel cage is fixed to the motor shaft.

[0020] As an improvement, the squirrel cage is fixedly connected to the motor shaft through a keyway.

[0021] As an improvement, the squirrel cage has an end wall, which extends toward one side of the motor rotor assembly to form a central bulge, and a bearing is provided between the outer periphery of the central bulge and the high-speed rotor assembly. The end wall extends away from the motor rotor assembly to form an edge bulge ring, and a bearing is provided between the inner periphery of the edge bulge ring and the casing assembly.

[0022] As an improvement, the low-speed rotor assembly also includes a shielding ring, and the low-speed rotor permanent magnet array includes a plurality of circumferentially distributed low-speed rotor magnets located radially inside the shielding ring and two magnet end rings located at both ends of the low-speed rotor magnets in the circumferential direction.

[0023] As an improvement, the motor shaft is fixedly connected to the motor stator assembly;

[0024] A bearing is provided between the motor shaft and the high-speed rotor assembly;

[0025] A bearing is provided between the hub sleeve and the modulation assembly.

[0026] As an improvement, the wheel hub sleeve is cylindrical, and the casing assembly also includes an end cover fixed to the wheel hub sleeve by screws. The end cover is located at the axial end where the motor stator is located. Shell bearings are provided at the end of the wheel hub sleeve axially away from the end cover and in the end cover. The motor shaft is located in the two shell bearings, and sealing rings are provided between the motor shaft, the wheel hub sleeve and the end cover.

[0027] The beneficial effects of the magnetic reduction hub motor of the present invention are: the high-speed rotor assembly, the low-speed rotor assembly, and the modulation assembly form a magnetic reducer, so that the hub motor has the speed reduction and torque increase capability of traditional mechanical gears, and at the same time has the overload protection capability that traditional mechanical gear reducers do not have; the overall structure is compact. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural diagram of the magnetic reduction hub motor of the first embodiment of the present utility model.

[0029] Figure 2 It is a cross-sectional view of the magnetic reduction hub motor according to the first embodiment of the present invention.

[0030] Figure 3 This is an exploded view of the magnetic reduction hub motor of the first embodiment of the present invention.

[0031] Figure 4 This is a structural exploded view of the motor rotor assembly and the high-speed rotor assembly of the magnetic reduction hub motor in the first embodiment of the present invention.

[0032] Figure 5 This is a structural exploded view of the low-speed rotor assembly and the hub sleeve of the magnetic reduction hub motor in the first embodiment of the present invention.

[0033] Figure 6 and Figure 7 Structural exploded views at different angles of the modulation assembly of the magnetic reduction hub motor according to the first embodiment of the present invention.

[0034] Figure 8 This is a structural exploded view of the housing assembly of the magnetic reduction hub motor according to the first embodiment of the present invention.

[0035] In the figure, 1, housing assembly; 11, hub sleeve; 12, end cover;

[0036] 2. Motor stator assembly;

[0037] 3. Motor rotor assembly;

[0038] 4. High-speed rotor assembly; 41. High-speed rotor permanent magnet array; 42. High-speed rotor shaft;

[0039] 5. Low-speed rotor assembly; 51. Low-speed rotor permanent magnet array; 511. Low-speed rotor magnet; 512. Magnet end ring; 52. Shielding ring;

[0040] 6. Modulation assembly; 61. Squirrel cage; 62. Modulation teeth; 63. Modulation end ring;

[0041] 7. Motor shaft;

[0042] B. Bearings. DETAILED DESCRIPTION

[0043] The technical solutions of the embodiments of the present invention are explained and described below, but the following embodiments are only preferred embodiments of the present invention and are not exhaustive. Based on the embodiments in the embodiments, other embodiments obtained by those skilled in the art without creative work are all within the scope of protection of the present invention.

[0044] See also Figures 1 to 8 The magnetic reduction hub motor of the embodiment of the present utility model includes:

[0045] housing assembly, including hub sleeve;

[0046] The motor stator assembly is fixed in the wheel hub sleeve;

[0047] The motor rotor assembly is located radially inward of the motor stator assembly;

[0048] a high-speed rotor assembly, which rotates synchronously with the motor rotor assembly and includes a high-speed rotor permanent magnet array;

[0049] The low-speed rotor assembly is located radially outside the high-speed rotor assembly, is fixedly connected to the hub sleeve, and includes a low-speed rotor permanent magnet array;

[0050] The modulation assembly is located between the high-speed rotor assembly and the low-speed rotor assembly, and maintains a first air gap with the high-speed rotor assembly and a second air gap with the high-speed rotor assembly;

[0051] The motor shaft is fixed at the center of the magnetic reduction hub motor;

[0052] Among them, the high-speed rotor assembly and the low-speed rotor assembly are configured with different pole pairs. Under the action of the modulation assembly, the magnetic field of the first air gap is coupled with the magnetic field of the second air gap, and the rotation from the high-speed rotor assembly is decelerated and output by the low-speed rotor assembly.

[0053] The magnetic reduction hub motor of the utility model includes a casing assembly, a motor stator assembly, a motor rotor assembly, a high-speed rotor assembly, a low-speed rotor assembly, a modulation assembly, and a motor shaft. The high-speed rotor assembly, the low-speed rotor assembly, and the modulation assembly form a magnetic reducer, so that the hub motor has the speed reduction and torque increase capability of traditional mechanical gears, and also has the overload protection capability that traditional mechanical gear reducers do not have; the overall structure is compact.

[0054] Example 1

[0055] See also Figures 1 to 8 The magnetic reduction hub motor of the first embodiment of the present invention comprises:

[0056] The housing assembly 1 includes a hub sleeve 11 and an end cover 12;

[0057] The motor stator assembly 2 is fixed in the hub sleeve 11;

[0058] The motor rotor assembly 3 is located radially inward of the motor stator assembly 2;

[0059] The high-speed rotor assembly 4 rotates synchronously with the motor rotor assembly 3 and includes a high-speed rotor permanent magnet array 41;

[0060] The low-speed rotor assembly 5 is located radially outside the high-speed rotor assembly 4 and is fixed to the hub sleeve 11 , and includes a low-speed rotor permanent magnet array 51 ;

[0061] The modulation assembly 6 is located between the high-speed rotor assembly 4 and the low-speed rotor assembly 5, and maintains a first air gap with the high-speed rotor assembly 4 and a second air gap with the high-speed rotor assembly 4;

[0062] The motor shaft 7 is fixed at the center of the magnetic reduction hub motor;

[0063] Among them, the high-speed rotor assembly 4 and the low-speed rotor assembly 5 are configured with different pole pairs. Under the action of the modulation assembly 6, the magnetic field of the first air gap is coupled with the magnetic field of the second air gap, and the rotation from the high-speed rotor assembly 4 is decelerated and output by the low-speed rotor assembly 5.

[0064] In this embodiment, the high-speed rotor assembly 4, the low-speed rotor assembly 5 and the modulation assembly 6 form a magnetic reducer, and the working principle of the magnetic reducer can refer to the existing technology.

[0065] In this embodiment, the hub sleeve 11 is cylindrical, and the end cover 12 is located at the axial end where the motor stator is located. The hub sleeve 11 and the end cover 12 are fixed together by multiple circumferentially distributed screws, and the screws are axially screwed into the hub sleeve 11.

[0066] In this embodiment, shell bearings B are provided at one end of the hub sleeve 11 axially away from the end cover 12 and in the end cover 12 , and the motor shaft 7 is located in the two shell bearings B.

[0067] In this embodiment, sealing rings are provided between the motor shaft 7 and the hub sleeve 11 and the end cover 12 , and the sealing rings seal the motor shaft 7 and the hub sleeve 11 and the end cover 12 .

[0068] In this embodiment, the principle of energizing the motor stator assembly 2 to rotate the motor rotor assembly 3 is based on prior art.

[0069] In this embodiment, the motor rotor assembly 3 and the high-speed rotor assembly 4 rotate synchronously through internal and external gear meshing. In other embodiments, the motor rotor assembly 3 and the high-speed rotor assembly 4 of the magnetic reducer can be connected in other ways, and the motor rotor assembly 3 and the high-speed rotor assembly 4 can also have different rotational speeds. Synchronous rotation refers to simultaneous rotation, while synchronous rotation refers to the same rotational speed, i.e., the same number of revolutions per minute.

[0070] In this embodiment, the high-speed rotor assembly 4 further includes a high-speed rotor shaft 42 , which forms an outer tooth portion at one end axially close to the motor rotor assembly 3 , and the motor rotor assembly 3 forms an inner tooth portion at one end axially close to the high-speed rotor assembly 4 .

[0071] In this embodiment, the high-speed rotor permanent magnet array 41 comprises a plurality of circumferentially distributed permanent magnets and two circular rings. Each permanent magnet has a notch formed at both axial ends, and the two circular rings are positioned within the notch. The high-speed rotor permanent magnet array 41 can also be constructed in other configurations. The entire high-speed rotor assembly 4 moves as a single unit.

[0072] In this embodiment, the modulation assembly 6 includes a cage 61 with a plurality of mounting grooves distributed in an annular pattern, modulation teeth 62 disposed in the mounting grooves, and a modulation end ring 63 . The modulation end ring 63 and the cage 61 form a positioning structure.

[0073] In this embodiment, the squirrel cage 61 is fixedly connected to the motor shaft 7 via a keyway.

[0074] In this embodiment, the squirrel cage 61 has an end wall, which extends toward the side of the motor rotor assembly 3 to form a central convex portion, and a bearing B is provided between the outer periphery of the central convex portion and the high-speed rotor assembly 4. The end wall extends away from the side of the motor rotor assembly 3 to form an edge convex ring, and a bearing B is provided between the inner periphery of the edge convex ring and the casing assembly 1.

[0075] In this embodiment, the low-speed rotor assembly 5 also includes a shielding ring 52, and the low-speed rotor permanent magnet array 51 includes a plurality of low-speed rotor magnets 511 distributed circumferentially on the radial inner side of the shielding ring 52 and two magnet end rings 512 respectively located at the circumferential ends of the low-speed rotor magnets 511.

[0076] In this embodiment, the motor shaft 7 is fixedly connected to the motor stator assembly 2. During driving, the motor shaft 7 is always fixed and does not rotate, and the vehicle frame and the like are mounted on the motor shaft 7.

[0077] In this embodiment, a bearing B is provided between the motor shaft 7 and the high-speed rotor assembly 4.

[0078] In this embodiment, a bearing B is provided between the hub sleeve 11 and the modulation assembly 6 .

[0079] The working process of the magnetic reduction hub motor in the first embodiment of the present invention is as follows: after the hub motor is energized, the motor stator assembly 2 causes the motor rotor assembly 3 to rotate (assuming that it is the forward direction of travel at this time), and the motor rotor assembly 3 drives the high-speed rotor assembly 4 to rotate. Due to the cooperation of the high-speed rotor assembly 4, the modulation assembly 6 and the low-speed rotor assembly 5, the low-speed rotor assembly 5 also rotates. At this time, the modulation assembly 6 is fixed, the high-speed rotor assembly 4 and the low-speed rotor assembly 5 rotate, and the low-speed rotor assembly 5 is fixed on the hub cover 11, then the hub cover 11 and the end cover 12 rotate, and the tire outside the hub cover 11 (not shown in the figure) also rotates, thereby realizing the forward movement of the electric bicycle; the principle is the same when the hub motor rotates in the opposite direction (reversing).

[0080] The beneficial effects of the magnetic reduction hub motor of the first embodiment of the present invention are as follows: the high-speed rotor assembly 4, the low-speed rotor assembly 5, and the modulation assembly 6 form a magnetic reducer, so that the hub motor has the speed reduction and torque increase capability of traditional mechanical gears, and also has the overload protection capability that traditional mechanical gear reducers do not have; the magnetic reducer formed by the high-speed rotor assembly 4, the low-speed rotor assembly 5, and the modulation assembly 6 has a unique structure, making the overall structure compact; the magnetic reducer formed by the low-speed rotor assembly 5, the high-speed rotor assembly 4 and the modulation assembly 6 has high efficiency.

[0081] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Those skilled in the art will understand that the present invention includes, but is not limited to, the contents described in the above specific embodiments. Any modifications that do not deviate from the functional and structural principles of the present invention are intended to be included within the scope of the claims.

Claims

1. Magnetic reduction hub motor, characterized by: include: housing assembly, including hub sleeve; The motor stator assembly is fixed in the wheel hub sleeve; The motor rotor assembly is located radially inward of the motor stator assembly; a high-speed rotor assembly, which rotates synchronously with the motor rotor assembly and includes a high-speed rotor permanent magnet array; The low-speed rotor assembly is located radially outside the high-speed rotor assembly, is fixedly connected to the hub sleeve, and includes a low-speed rotor permanent magnet array; The modulation assembly is located between the high-speed rotor assembly and the low-speed rotor assembly, and maintains a first air gap with the high-speed rotor assembly and a second air gap with the high-speed rotor assembly; The motor shaft is fixed at the center of the magnetic reduction hub motor; Among them, the high-speed rotor assembly and the low-speed rotor assembly are configured with different pole pairs. Under the action of the modulation assembly, the magnetic field of the first air gap is coupled with the magnetic field of the second air gap, and the rotation from the high-speed rotor assembly is decelerated and output by the low-speed rotor assembly.

2. The magnetic reduction hub motor according to claim 1, characterized in that: The motor rotor assembly and the high-speed rotor assembly rotate at the same speed through the meshing of internal and external teeth.

3. The magnetic reduction hub motor according to claim 2, characterized in that: The high-speed rotor assembly also includes a high-speed rotor shaft, which forms an external tooth portion axially close to one end of the motor rotor assembly, and the motor rotor assembly forms an internal tooth portion axially close to one end of the high-speed rotor assembly. The high-speed rotor permanent magnet array includes multiple permanent magnets distributed circumferentially and two circular rings, and each permanent magnet has a gap formed at both axial ends, and the two circular rings are located in the gap.

4. The magnetic reduction hub motor according to claim 1, characterized in that: The modulation component comprises a squirrel cage with a plurality of mounting grooves distributed in an annular manner, modulation teeth and modulation end rings arranged in the mounting grooves, and a positioning structure is formed between the modulation end ring and the squirrel cage.

5. The magnetic reduction hub motor according to claim 4, characterized in that: The squirrel cage is fixed to the motor shaft.

6. The magnetic reduction hub motor according to claim 5, characterized in that: The squirrel cage is fixed to the motor shaft through a keyway.

7. The magnetic reduction hub motor according to claim 4, characterized in that: The squirrel cage has an end wall, which extends toward one side of the motor rotor assembly to form a central convex portion, and a bearing is provided between the outer periphery of the central convex portion and the high-speed rotor assembly. The end wall extends away from the motor rotor assembly to form an edge convex ring, and a bearing is provided between the inner periphery of the edge convex ring and the casing assembly.

8. The magnetic reduction hub motor according to claim 1, characterized in that: The low-speed rotor assembly also includes a shielding ring. The low-speed rotor permanent magnet array includes a plurality of circumferentially distributed low-speed rotor magnets located radially inside the shielding ring and two magnet end rings located at both ends of the low-speed rotor magnets.

9. The magnetic reduction hub motor according to claim 1, characterized in that: The motor shaft is fixedly connected to the motor stator assembly; A bearing is provided between the motor shaft and the high-speed rotor assembly; A bearing is provided between the hub sleeve and the modulation assembly.

10. The magnetic reduction hub motor according to claim 1, characterized in that: The wheel hub sleeve is cylindrical, and the casing assembly also includes an end cover fixed to the wheel hub sleeve by screws. The end cover is located at the axial end where the motor stator is located. Shell bearings are provided at the end of the wheel hub sleeve axially away from the end cover and in the end cover. The motor shaft is located in the two shell bearings, and sealing rings are provided between the motor shaft, the wheel hub sleeve and the end cover.

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