A hub motor magnet fixing installation structure

Abstract

This utility model discloses a magnet fixing and mounting structure for a hub motor, including a rotor housing and multiple magnet pieces. The rotor housing is annular, with multiple positioning grooves on its inner side. These positioning grooves are spaced apart along the circumference. The upper end of each positioning groove extends to the outer side of the rotor housing and is open to form a sliding insertion port for the magnet pieces. The lower end of each positioning groove has a limiting stop. The cross-sectional shape and size of each magnet piece match the positioning groove. Each magnet piece is movably embedded in its corresponding positioning groove, with the back of the magnet piece tightly fitted against the groove surface and the bottom edge of the magnet piece limited by the limiting stop. Compared with the prior art, this eliminates the need for a magnet bracket, significantly reducing the manufacturing cost of the hub motor; the sliding insertion of the magnet pieces greatly improves the assembly speed.

Description

Technical Field

[0001] This utility model relates to the field of hub motor technology, and in particular to a hub motor magnet fixing and mounting structure. Background Technology

[0002] In the design of hub motors, the method of fixing and assembling the magnet assembly directly affects the motor's performance, production efficiency, and manufacturing cost. In existing technologies, magnet assembly generally adopts the following technical solution: the rotor magnets are typically installed using an independent magnet bracket structure. This magnet bracket is formed through stamping, casting, or welding processes and then undergoes secondary assembly with the rotor hub. Magnet pieces are individually embedded into pre-set dovetail or T-slots in the magnet bracket, and then secured using bolts, clips, or adhesives. Finally, the bracket assembly containing the magnets is press-fitted to the inner side of the hub.

[0003] This traditional technical solution has the following drawbacks: 1. Complex structure: It requires an additional magnet bracket design, increasing the volume and precision requirements of the casting mold. Furthermore, the bracket body must include at least a positioning boss, fixing holes, and a magnet limiting structure, leading to an increase in the number of parts and extended assembly time. 2. Low assembly efficiency: Magnet pieces must be inserted one by one into the bracket slots using specialized insert tooling, requiring extremely high tolerances and creating a significant bottleneck in operational efficiency. When magnets are misaligned, the entire bracket must be disassembled and readjusted, increasing the scrap rate. 3. High manufacturing cost: The additional bracket material increases the iron consumption per motor by approximately 15-20%, and the mating surfaces of the bracket and hub require surface treatment, further increasing manufacturing costs. Therefore, improvements are necessary. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a magnet assembly structure for a hub motor, which eliminates the use of magnet brackets, reduces the manufacturing cost of hub motors, and improves the assembly speed of hub motors.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a hub motor magnet fixing and mounting structure, including a rotor housing and multiple magnet pieces. The rotor housing is arranged in a circular shape, and multiple positioning grooves are opened on its inner side. Each positioning groove is distributed at intervals along the circumference. The upper end of the positioning groove extends to the outer side of the rotor housing and is open to form a sliding insertion port for the magnet piece. The lower end of the positioning groove is provided with a limiting stop. The cross-sectional shape and size of each magnet piece match the positioning groove. Each magnet piece is movably embedded in the corresponding positioning groove. The back of the magnet piece is in close contact with the groove surface of the positioning groove, and the bottom edge of the magnet piece is limited and engaged with the limiting stop.

[0006] In a further technical solution, an adhesive layer is provided between the positioning groove and the magnet piece, and the two are fastened together by the adhesive layer.

[0007] In further technical solutions, the positioning groove includes a right-angle groove, a dovetail groove, a V-shaped groove, an arc groove, or a curved groove.

[0008] In a further technical solution, the positioning groove is a curved groove. The groove surface includes a bottom surface and two limiting surfaces. The two limiting surfaces are symmetrically connected to the left and right sides of the bottom surface. The bottom surface is an elliptical or circular arc surface, and the limiting surfaces are elliptical or circular arc surfaces.

[0009] In a further technical solution, the outer side of the magnet sheet is provided with a first arc-shaped surface and the inner side is provided with a second arc-shaped surface; the back of the magnet sheet is formed with a curved surface structure that matches the positioning groove. The curved surface structure includes a second arc-shaped surface and two third arc-shaped surfaces. These two third arc-shaped surfaces are respectively connected to the left and right sides of the second arc-shaped surface and are combined to form a curved surface structure that matches the groove surface of the positioning groove.

[0010] In a further technical solution, the magnet sheet has clamping surfaces formed on both sides. The clamping surfaces are straight and connected between the first arc surface and the third arc surface. When the magnet sheet is assembled into the corresponding positioning groove, the clamping surfaces of the magnet sheet protrude from the positioning groove and the inner side of the rotor housing.

[0011] In a further technical solution, the magnetic poles of two adjacent magnets are arranged in opposite directions; the inner wall of the positioning groove is provided with anti-slip texture; the back of the magnet is provided with a textured structure that matches the anti-slip texture, so as to enhance the fit between the magnet and the groove surface of the positioning groove and the coefficient of friction.

[0012] In a further technical solution, the rotor housing is provided with mounting and positioning holes in its axial direction. The number of mounting and positioning holes is 4-20, and each mounting and positioning hole is evenly distributed on the circumference of the rotor housing, for mounting the rotor housing to the hub motor shaft.

[0013] In a further technical solution, the outer wall of the rotor housing is formed with multiple protrusions, which are spaced apart along the circumferential direction to improve the welding strength of the formed tire.

[0014] The advantages of this invention compared to the prior art after adopting the above structure are:

[0015] 1. Eliminating the use of magnet brackets reduces the procurement cost of raw materials for magnet brackets and also saves the costs incurred in the processing and manufacturing of magnet brackets, including mold development and machining costs. This effectively reduces the overall manufacturing cost of the hub motor, giving it a price advantage in market competition and improving the product's market competitiveness.

[0016] 2. The magnet pieces are installed in the positioning slots of the rotor housing via a sliding insertion method. Compared to the traditional assembly method that requires complex positioning and fixing with magnet brackets, the operation is simpler and faster. Workers can insert the magnet pieces into the positioning slots more quickly and accurately, reducing the adjustment and calibration time during the assembly process, greatly improving the assembly speed of the hub motor, which is conducive to improving production efficiency and meeting the needs of large-scale production. The design of the positioning slots being spaced out along the circumference and open at the top makes the insertion direction of the magnet pieces clear, easy for workers to operate, and further improves the convenience and efficiency of assembly.

[0017] 3. The limiting stop at the lower end of the positioning groove can effectively limit the bottom edge of the magnet piece. Combined with the tight fit between the magnet piece and the surface of the positioning groove, as well as the adaptation of the back side to the anti-slip texture, the magnet piece is firmly installed in the rotor housing, and it is not easy for it to loosen or shift. This ensures the stability of the magnet position during the operation of the hub motor, thereby ensuring the stability and reliability of the motor performance.

[0018] 4. The protrusions on the outer wall of the rotor housing can improve the welding strength between the molded tire and the rotor housing, making the connection between the rotor housing and the tire more stable. During the operation of the hub motor, it can better withstand the action of various forces, reduce the risk of failure caused by weak connection, and extend the service life of the hub motor. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] Figure 1 This is a schematic diagram showing the disassembled structure of the magnet sheet of this utility model.

[0021] Figure 2 yes Figure 1 Enlarged view of point A in the image.

[0022] Figure 3 This is a schematic diagram of the structure of this utility model.

[0023] Figure 4 This is a schematic diagram of the structure of the magnet sheet in this utility model. Detailed Implementation

[0024] The following are merely preferred embodiments of the present invention and do not limit the scope of protection of the present invention.

[0025] like Figures 1 to 4As shown, a hub motor magnet fixing and mounting structure includes a rotor housing 1 and multiple magnet pieces 3. The rotor housing 1 is arranged in a circular shape, and multiple positioning grooves 2 are opened on its inner side. The positioning grooves 2 are distributed at intervals along the circumference. The upper end of the positioning groove 2 extends to the outer side of the rotor housing 1 and is open to form a sliding insertion port for the magnet pieces 3. The lower end of the positioning groove 2 is provided with a limiting stop 23. The cross-sectional shape and size of each magnet piece 3 match the positioning groove 2. Each magnet piece 3 is movably embedded in the corresponding positioning groove 2. The back of the magnet piece 3 is in close contact with the groove surface of the positioning groove 2, and the bottom edge of the magnet piece 3 is limited and engaged with the limiting stop 23.

[0026] The proposed magnet assembly structure eliminates the need for magnet brackets, reducing the procurement cost of magnet bracket raw materials. It also eliminates the costs associated with the processing and manufacturing of magnet brackets, including mold development and machining costs. This effectively reduces the overall manufacturing cost of the hub motor, giving it a price advantage in the market and enhancing the product's market competitiveness.

[0027] The magnet 3 is installed in the positioning slot 2 of the rotor housing by sliding insertion. Compared with the traditional assembly method that requires complex positioning and fixing with the help of magnet brackets, the operation is simpler and faster. Workers can insert the magnet 3 into the positioning slot 2 more quickly and accurately, reducing the adjustment and calibration time during the assembly process, greatly improving the assembly speed of the hub motor, which is conducive to improving production efficiency and meeting the needs of large-scale production. The design of the positioning slot 2, which is spaced along the circumference and open at the top, makes the insertion direction of the magnet 3 clear and easy for workers to operate, further improving the convenience and efficiency of assembly.

[0028] The limiting stop 23 at the lower end of the positioning groove 2 can effectively limit the bottom edge of the magnet piece 3. Combined with the tight fit between the magnet piece 3 and the groove surface of the positioning groove 2, as well as the adaptation of the back side with the anti-slip texture, the magnet piece 3 is firmly installed in the rotor housing 1, and it is not easy to loosen or shift. This ensures the stability of the magnet position during the operation of the hub motor, thereby ensuring the stability and reliability of the motor performance.

[0029] Specifically, an adhesive layer is provided between the positioning groove 2 and the magnet piece 3. The adhesive layer is made of epoxy resin glue, cyanoacrylate glue, silicone or polyurethane glue and the two are firmly connected by the adhesive layer.

[0030] Specifically, the positioning groove 2 includes a right-angle groove, a dovetail groove, a V-shaped groove, an arc-shaped groove, or a curved groove. In this embodiment, the positioning groove 2 is a curved groove. The groove surface of the positioning groove 2 includes a groove bottom surface 21 and two limiting surfaces 22. The two limiting surfaces 22 are symmetrically connected to the left and right sides of the groove bottom surface 21, respectively. The groove bottom surface 21 is a circular arc surface, and the limiting surfaces 22 are elliptical arc surfaces.

[0031] Specifically, the bottom width L1 of the positioning groove 2 is 15mm; the opening width L2 of the positioning groove 2 is greater than the bottom width L1, and its size range is 19mm; the depth d of the positioning groove 2 is 2mm.

[0032] Specifically, the outer side of the magnet sheet 3 is provided with a first arc-shaped surface 31 and the inner side is provided with a second arc-shaped surface 32; the back of the magnet sheet 3 is formed with a curved surface structure that matches the positioning groove 2. The curved surface structure includes the second arc-shaped surface 32 and two third arc-shaped surfaces 33. The two third arc-shaped surfaces 33 are respectively connected to the left and right sides of the second arc-shaped surface 32 and are combined to form a curved surface structure that matches the groove surface of the positioning groove 2.

[0033] Specifically, the magnet sheet 3 has clamping surfaces 34 formed on both sides. The clamping surfaces 34 are straight and connected between the first arc surface 31 and the third arc surface 33. When the magnet sheet 3 is assembled into the corresponding positioning groove 2, the clamping surfaces 34 of the magnet sheet 3 protrude from the positioning groove 2 and the inner side of the rotor housing 1. The width of the clamping surfaces 34 is 0.5mm.

[0034] Specifically, the magnetic poles of two adjacent magnet pieces 3 are arranged in opposite directions; the inner wall of the positioning groove 2 is provided with anti-slip texture, the depth of which is 0.01mm; the back of the magnet piece 3 is provided with a texture structure that matches the anti-slip texture, so as to enhance the fit between the magnet piece 3 and the groove surface of the positioning groove 2 and the coefficient of friction.

[0035] Specifically, the rotor housing 1 has 13 mounting holes 10 in its axial direction. The mounting holes 10 are evenly distributed on the circumference of the rotor housing 1 and are used to mount the rotor housing 1 to the hub motor shaft.

[0036] Specifically, the outer wall of the rotor housing 1 is formed with multiple protrusions 4, which are spaced apart along the circumferential direction to improve the welding strength of the formed tire.

[0037] The protrusion 4 on the outer wall of the rotor housing 1 can improve the welding strength between the molded tire and the rotor housing 1, making the connection between the rotor housing 1 and the tire more stable. During the operation of the hub motor, it can better withstand the action of various forces, reduce the risk of failure caused by weak connection, and extend the service life of the hub motor.

[0038] The above description is only a preferred embodiment of this utility model. For those skilled in the art, there will be changes in the specific implementation method and application scope based on the idea of ​​this utility model. The content of this specification should not be construed as a limitation of this utility model.

Claims

1. A magnet fixing and mounting structure for a hub motor, characterized in that: It includes a rotor housing (1) and multiple magnet pieces (3). The rotor housing (1) is arranged in a circular shape, and multiple positioning grooves (2) are opened on its inner side. The positioning grooves (2) are distributed at intervals along the circumference. The upper end of the positioning groove (2) extends to the outer side of the rotor housing (1) and is open to form a sliding insertion port for the sliding magnet piece (3). The lower end of the positioning groove (2) is provided with a limiting stop (23). The cross-sectional shape and size of each magnet piece (3) are matched with the positioning groove (2). Each magnet piece (3) is movably embedded in the corresponding positioning groove (2). The back of the magnet piece (3) is in close contact with the groove surface of the positioning groove (2). The bottom edge of the magnet piece (3) is in a limiting fit with the limiting stop edge (23).

2. The hub motor magnet fixing and mounting structure according to claim 1, characterized in that: An adhesive layer is provided between the positioning groove (2) and the magnet piece (3), and the two are fastened together by the adhesive layer.

3. The hub motor magnet fixing and mounting structure according to claim 2, characterized in that: The positioning groove (2) includes a right-angle groove, a dovetail groove, a V-shaped groove, an arc-shaped groove, or a curved groove.

4. The hub motor magnet fixing and mounting structure according to claim 3, characterized in that: The positioning groove (2) is a curved groove. The groove surface of the positioning groove (2) includes a bottom surface (21) and two limiting surfaces (22). The two limiting surfaces (22) are symmetrically connected to the left and right sides of the bottom surface (21). The bottom surface (21) is set as an elliptical arc surface or a circular arc surface; the limiting surfaces (22) are set as elliptical arc surfaces or circular arc surfaces.

5. The hub motor magnet fixing and mounting structure according to claim 4, characterized in that: The outer side of the magnet sheet (3) is provided with a first arc-shaped surface (31) and the inner side is provided with a second arc-shaped surface (32); the back of the magnet sheet (3) is formed with a curved surface structure that matches the positioning groove (2). The curved surface structure includes the second arc-shaped surface (32) and two third arc-shaped surfaces (33). The two third arc-shaped surfaces (33) are respectively connected to the left and right sides of the second arc-shaped surface (32) and are combined to form a curved surface structure that matches the groove surface of the positioning groove (2).

6. The hub motor magnet fixing and mounting structure according to claim 5, characterized in that: The magnet sheet (3) has clamping surfaces (34) formed on both sides. The clamping surfaces (34) are straight and connected between the first arc surface (31) and the third arc surface (33). When the magnet sheet (3) is assembled into the corresponding positioning groove (2), the clamping surfaces (34) of the magnet sheet (3) protrude from the positioning groove (2) and the inner side of the rotor housing (1).

7. The hub motor magnet fixing and mounting structure according to claim 1, characterized in that: The magnetic poles of two adjacent magnet pieces (3) are arranged in opposite directions.

8. The hub motor magnet fixing and mounting structure according to claim 1, characterized in that: The rotor housing (1) has mounting and positioning holes (10) in its axial direction. The number of mounting and positioning holes (10) is 4-20. Each mounting and positioning hole (10) is evenly distributed on the circumference of the rotor housing (1) and is used to install the rotor housing (1) onto the hub motor shaft.

9. The hub motor magnet fixing and mounting structure according to claim 1, characterized in that: The outer wall of the rotor housing (1) is formed with a plurality of protrusions (4), which are spaced apart along the circumferential direction to improve the welding strength of the formed tire.

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