A rotor structure for electric bicycles

Abstract

This utility model relates to the field of hub motor technology and discloses a rotor structure for a power-assisted bicycle, including a hub with cover plates attached to both ends. A rotor is disposed inside the hub, and several shock-absorbing pads are fixedly connected to the outer ring of the rotor. A limiting plate is provided between the shock-absorbing pads, and the limiting plate is fixedly connected to the outer ring of the rotor. Several mounting grooves are passed through the end of the inner ring of the rotor, and several magnets are attached to the mounting grooves. Limiting blocks are attached to both ends of the magnets, and the limiting blocks are fixedly connected to the outer wall of the cover plate. Through grooves are opened on the inner ring of the rotor corresponding to the mounting grooves. Limiting frames are fixedly connected to the inner wall of the hub corresponding to the limiting plates. The limiting plates are located inside and attached to the limiting frames. This invention solves the problems of cumbersome installation and disassembly of rotors and magnets in existing hub motors, easy damage to rotors and magnets by the hub during use, reduced service life, and high maintenance and replacement costs.

Description

Technical Field

[0001] This utility model relates to the field of hub motor technology, and more specifically to a rotor structure for electric bicycles. Background Technology

[0002] In-wheel motors are a type of motor technology that integrates the power system, transmission, and braking function within the wheel. Their history dates back to 1896 when Porsche first applied them to electric vehicles. This technology offers advantages such as simplified vehicle structure and improved transmission efficiency, supporting multiple drive modes (e.g., front-wheel drive, four-wheel drive) and differential steering. In the field of new energy vehicles, in-wheel motors are compatible with various models, including pure electric and range-extended electric vehicles. Furthermore, due to their low cost and ease of maintenance, they have become a core power solution for electric motorcycles. However, limitations such as increased unsprung mass and heat dissipation efficiency still require continuous technological breakthroughs.

[0003] A search revealed a magnetic ring structure for a motor and a hub motor, with publication number CN221009877U. The magnetic ring structure includes multiple sets of magnet pole pairs arranged to form a circular magnetic ring. Each set of magnet pole pairs includes six magnetic tiles. Adjacent magnetic tiles within the same magnet pole pair have the same magnetization angle difference. The magnet pole pairs are arranged in a Halbach array, which enhances the magnetic field inside the circular magnetic ring and weakens the magnetic field outside the ring. This invention can improve the torque density and power density of the motor, increase material utilization, and ensure the motor's output power density.

[0004] The installation and disassembly of the rotor and magnet of the existing hub motor are relatively cumbersome, and the rotor and magnet are easily damaged by the hub during use, which reduces their service life and the later maintenance and replacement costs are high. Based on this, this utility model designs a rotor structure for electric bicycles to solve the above problems. Utility Model Content

[0005] In order to overcome the above-mentioned defects of the prior art, the present invention provides a rotor structure for electric bicycles to solve the problems existing in the background art.

[0006] This utility model provides the following technical solution: a rotor structure for a power-assisted bicycle, including a hub, with cover plates attached to both ends of the hub, a rotor inside the hub, a plurality of shock-absorbing pads fixedly connected to the outer ring of the rotor, a limiting plate provided between the shock-absorbing pads, the limiting plate fixedly connected to the outer ring of the rotor, a plurality of mounting grooves penetrating the end of the inner ring of the rotor, a plurality of magnets attached to the mounting grooves, a limiting block attached to both ends of the magnets, the limiting block fixedly connected to the outer wall of the cover plate, through grooves opened on the inner ring of the rotor corresponding to the mounting grooves, and a limiting frame fixedly connected to the inner wall of the hub corresponding to the limiting plate, the limiting plate being located inside and attached to the limiting frame.

[0007] Furthermore, circular grooves are provided on both sides of the outer wall of the hub, and circular rings are fitted into the grooves, with the circular rings fixedly connected to the outer wall of the cover plate.

[0008] Furthermore, the outer wall of the cover plate is provided with a main mounting hole corresponding to the limiting plate, and the two ends of the limiting plate are provided with a secondary mounting hole corresponding to the main mounting hole.

[0009] Furthermore, the inner wall of the wheel hub is provided with arc-shaped grooves corresponding to the shock-absorbing pads, and the shock-absorbing pads are located in the arc-shaped grooves and fit against them.

[0010] Furthermore, all the limiting blocks penetrate the mounting groove, and the limiting blocks are in contact with the inner wall of the mounting groove.

[0011] Furthermore, the width of the mounting groove is greater than the width of the through groove.

[0012] The technical effects and advantages of this utility model are as follows:

[0013] 1. In this utility model, when using a magnet, it is only necessary to insert it into the mounting groove of the inner ring of the rotor. Since the width of the mounting groove is greater than the width of the through groove, the magnet will not fall off during the rotation of the rotor. Then, the rotor's limiting plate is aligned with the limiting frame of the inner ring of the hub and inserted. The shock-absorbing pad on the outer wall of the rotor fits into the arc groove. The shock-absorbing pad can reduce the damage to the internal rotor and magnet when the hub is damaged, effectively improving the service life of the rotor.

[0014] 2. After aligning the main mounting hole of the cover plate with the secondary mounting hole of the limiting plate, the ring of the cover plate is inserted into the circular grooves on both sides of the hub, and the limiting blocks on the cover plate are inserted into the mounting grooves of the rotor until the limiting blocks on both sides fix the magnets in the mounting grooves. At this time, the bolts are fixed in the secondary mounting holes through the main mounting holes, which facilitates subsequent maintenance and replacement. This completes the fixing of the hub, cover plate and rotor, effectively improving the installation efficiency of the rotor and magnets, and facilitating the individual replacement and disassembly of the rotor and magnets in the later stage, thereby reducing the subsequent use cost. Attached Figure Description

[0015] Figure 1 This is a front view of the entire utility model.

[0016] Figure 2 This is a cross-sectional view of the present invention.

[0017] Figure 3 This is a schematic diagram of the rotor structure of this utility model.

[0018] Figure 4 This is a schematic diagram of the through groove and mounting groove of this utility model.

[0019] Figure 5 This is an exploded view of the wheel hub and cover plate of this utility model.

[0020] The attached diagram is labeled as follows: 1. Hub; 2. Cover plate; 3. Main mounting hole; 4. Rotor; 5. Limiting plate; 6. Magnet; 7. Limiting block; 8. Secondary mounting hole; 9. Shock-absorbing pad; 10. Mounting groove; 11. Through groove; 12. Arc groove; 13. Circular groove; 14. Circular ring; 15. Limiting frame. Detailed Implementation

[0021] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. In addition, the forms of the various structures described in the following embodiments are merely illustrative. The rotor structure for electric bicycles involved in this utility model is not limited to the structures described in the following embodiments. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0022] Reference Figures 1-5This utility model provides a rotor structure for a power-assisted bicycle, including a hub 1, with cover plates 2 attached to both ends of the hub 1. Circular grooves 13 are formed on both sides of the outer wall of the hub 1, and circular rings 14 are attached to the grooves 13 and fixedly connected to the outer wall of the cover plates 2. A rotor 4 is housed inside the hub 1, and several shock-absorbing pads 9 are fixedly connected to the outer ring of the rotor 4. Arc-shaped grooves 12 are formed on the inner wall of the hub 1 corresponding to the shock-absorbing pads 9, with the shock-absorbing pads 9 located within and attached to the arc-shaped grooves 12. Limiting plates 5 are provided between the shock-absorbing pads 9, and the limiting plates 5 are fixedly connected to the outer ring of the rotor 4. The inner wall of the hub 1 is fixedly connected to the limiting plates 5. A fixed connection is established with a limiting bracket 15, and a limiting plate 5 is located within and fitted to the limiting bracket 15. When installing the magnet 6 of the rotor 4, it is only necessary to insert it into the mounting groove 10 of the inner ring of the rotor 4. Since the width of the mounting groove 10 is greater than the width of the through groove 11, the magnet 6 will not fall off during the rotation of the rotor 4. Then, the limiting plate 5 of the rotor 4 is aligned with the limiting bracket 15 of the inner ring of the hub 1 and inserted. The shock-absorbing pad 9 on the outer wall of the rotor 4 fits against the arc groove 12. The shock-absorbing pad 9 can reduce the damage to the internal rotor 4 and magnet 6 when the hub 1 is damaged, effectively improving the service life of the rotor 4. Cover plate 2 The outer wall of the limiting plate 5 is provided with main mounting holes 3, and the two ends of the limiting plate 5 are provided with auxiliary mounting holes 8 corresponding to the main mounting holes 3. The inner ring of the rotor 4 has several mounting grooves 10 through it. Several magnets 6 are attached to the mounting grooves 10. The two ends of the magnets 6 are attached with limiting blocks 7. The limiting blocks 7 all pass through the mounting grooves 10 and are attached to the inner wall of the mounting grooves 10. The limiting blocks 7 are fixedly connected to the outer wall of the cover plate 2. The inner ring of the rotor 4 is provided with through grooves 11 corresponding to the mounting grooves 10. The width of the mounting grooves 10 is greater than the width of the through grooves 11. The main mounting holes 3 of the cover plate 2 are aligned with the auxiliary mounting holes 8 of the limiting plate 5. Next, insert the ring 14 of the cover plate 2 into the circular grooves 13 on both sides of the hub 1, and insert the limiting blocks 7 on the cover plate 2 into the mounting grooves 10 of the rotor 4 until the limiting blocks 7 on both sides fix the magnets 6 in the mounting grooves 10. At the same time, the cover plate 2 is in contact with both ends of the hub 1. At this time, the bolts are fixed in the auxiliary mounting holes 8 through the main mounting holes 3, which facilitates subsequent maintenance and replacement. This completes the fixing of the hub 1, cover plate 2 and rotor 4, effectively improving the installation efficiency of rotor 4 and magnets 6, and facilitating the individual replacement and disassembly of rotor 4 and magnets 6 in the later stage, thereby reducing the subsequent use cost.

[0023] The working principle of this utility model is as follows: When installing the magnet 6 of the rotor 4, simply insert it into the mounting groove 10 of the inner ring of the rotor 4. Since the width of the mounting groove 10 is greater than the width of the through groove 11, the magnet 6 will not fall off during the rotation of the rotor 4. Then, align the limiting plate 5 of the rotor 4 with the limiting bracket 15 of the inner ring of the hub 1 and insert it. The shock-absorbing pad 9 on the outer wall of the rotor 4 fits against the arc groove 12. The shock-absorbing pad 9 can reduce the damage to the internal rotor 4 and magnet 6 when the hub 1 is damaged, effectively improving the service life of the rotor 4. After that, align the main mounting hole 3 of the cover plate 2 with the auxiliary mounting hole of the limiting plate 5. After hole 8, insert the ring 14 of cover plate 2 into the circular grooves 13 on both sides of hub 1, and insert the limiting blocks 7 on cover plate 2 into the mounting grooves 10 of rotor 4 until the limiting blocks 7 on both sides fix the magnets 6 in the mounting grooves 10. At the same time, cover plate 2 and hub 1 are in contact. At this time, the bolts are fixed in the auxiliary mounting holes 8 through the main mounting holes 3, which is convenient for subsequent maintenance and replacement. This completes the fixing of hub 1, cover plate 2 and rotor 4, effectively improving the installation efficiency of rotor 4 and magnets 6, and facilitating the individual replacement and disassembly of rotor 4 and magnets 6 in the later stage, so as to reduce the subsequent use cost.

[0024] Finally, the following points should be noted: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection", and "linkage" should be interpreted broadly, and can be mechanical or electrical connections, or internal connections between two components, or direct connections. "Up", "down", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may change.

[0025] Secondly: The accompanying drawings of the embodiments disclosed in this utility model only involve the structures involved in the embodiments disclosed in this utility model. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this utility model can be combined with each other.

[0026] Finally: The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A rotor structure for a power-assisted bicycle, comprising a hub (1), characterized in that: Both ends of the hub (1) are fitted with cover plates (2). A rotor (4) is provided inside the hub (1). Several shock-absorbing pads (9) are fixedly connected to the outer ring of the rotor (4). A limiting plate (5) is provided between the shock-absorbing pads (9). The limiting plate (5) is fixedly connected to the outer ring of the rotor (4). Several mounting grooves (10) are passed through the end of the inner ring of the rotor (4). Several magnets (6) are fitted inside the mounting grooves (10). Both ends of the magnets (6) are fitted with limiting blocks (7). The limiting blocks (7) are fixedly connected to the outer wall of the cover plate (2). The inner ring of the rotor (4) is provided with through grooves (11) corresponding to the mounting grooves (10). The inner wall of the hub (1) is fixedly connected to the limiting plate (5). The limiting plate (5) is located inside the limiting frame (15) and is fitted to it.

2. The rotor structure for a power-assisted bicycle according to claim 1, characterized in that: The outer wall of the hub (1) is provided with circular grooves (13) on both sides, and circular rings (14) are attached to the circular grooves (13), and the circular rings (14) are fixedly connected to the outer wall of the cover plate (2).

3. The rotor structure for a power-assisted bicycle according to claim 1, characterized in that: The outer wall of the cover plate (2) is provided with a main mounting hole (3) corresponding to the limiting plate (5), and the two ends of the limiting plate (5) are provided with a secondary mounting hole (8) corresponding to the main mounting hole (3).

4. The rotor structure for a power-assisted bicycle according to claim 1, characterized in that: The inner wall of the wheel hub (1) is provided with an arc-shaped groove (12) corresponding to the shock-absorbing pad (9), and the shock-absorbing pad (9) is located in the arc-shaped groove (12) and fits against it.

5. A rotor structure for a power-assisted bicycle according to claim 1, characterized in that: The limiting blocks (7) all penetrate the mounting groove (10), and the limiting blocks (7) are in contact with the inner wall of the mounting groove (10).

6. The rotor structure for a power-assisted bicycle according to claim 1, characterized in that: The width of the mounting groove (10) is greater than the width of the through groove (11).

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