Hub motor capable of improving assembly efficiency

Abstract

The utility model discloses a wheel hub motor capable of improving assembly efficiency, a stator assembly comprises a stator iron core and a plastic support, the plastic support is formed outside the stator iron core through a die covering process to form the stator assembly with an integrated structure, and the plastic support comprises a fixed base and a plurality of isolation sheaths. The upper portion of the fixed base is provided with a rotating column protruding upwards, the upper portion of the rotor shell is provided with a rotating hole, the rotating column penetrates through the rotating hole and extends out of the rotor shell, the rotating column is provided with a threading hole penetrating through the rotating column, the threading hole is communicated with the mounting groove, and the outer side face of the rotating column is provided with a positioning groove. Installation guiding is carried out when the hub motor is installed through the positioning groove, the fool-proof effect is achieved, a control line is prevented from being twisted and pressed between the hub motor and a product, the control line is protected, and the assembly efficiency is high. According to the stator assembly of the integrated structure, the distance between two adjacent stator pole claws is kept high in consistency, the edge thickness of a winding wire is prevented from being scratched, the burning risk is reduced, and the service life is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of hub motor technology, and in particular to a hub motor that improves assembly efficiency. Background Technology

[0002] Hub motors are external rotor motors primarily used to drive product movement. When installing a hub motor, the stator often needs to be connected to the product. Existing hub motor stators have protruding connecting blocks, and the corresponding products also have mounting slots. The connecting blocks secure the motor to the product, but there is no foolproof design. Since the hub motor's control wires need to pass through to connect to the product, a wire-passing hole needs to be made in the mounting slot. During assembly, the control wires are often first passed through the wire-passing hole, and then the connecting block is inserted into the mounting slot. Because there is no foolproof positioning structure, the control wires are prone to twisting and being squeezed between the connecting block and the mounting slot during assembly, leading to damage and poor reliability and stability. Therefore, manual alignment is required during assembly to prevent the control wires from twisting and being squeezed, resulting in low assembly efficiency and complex operation.

[0003] On the other hand, the stator coils and the iron core need to be isolated by a plastic bracket. The existing iron core is made by wrapping the plastic bracket around the iron core with rubber. The iron core includes a fixed ring and stator pole claws formed on the outer side of the fixed ring at equal intervals along the circumference. Therefore, the plastic bracket can only wrap around from the outside and cannot completely penetrate the fixed iron core. As a result, gaps are easily generated between the iron core and the plastic bracket after long-term use, causing the plastic bracket to wobble relative to the iron core. This leads to a decrease in smoothness, an increase in noise, and even vibration when the hub motor is running, resulting in poor reliability and stability. Therefore, it is necessary to improve this. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a hub motor that improves assembly efficiency, protects the control line, enhances the connection strength between the rotor core and the plastic bracket, and improves reliability and stability.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is: a hub motor with improved assembly efficiency, comprising a rotor housing, a rotor assembly, and a stator assembly. The rotor assembly is disposed on the side of the inner cavity of the rotor housing, and the stator assembly is disposed within the inner cavity of the rotor housing. The stator assembly includes a stator core and a plastic support. The plastic support is formed on the outside of the stator core through a die-casting process to form an integral stator assembly structure. Coils are wound around the plastic support.

[0006] The stator core includes a fixed ring and multiple stator pole claws, with each stator pole claw evenly spaced along the circumferential direction on the outer surface of the fixed ring.

[0007] The plastic support includes a fixed base and multiple isolation sleeves. The fixed base wraps around the outside of a fixed ring, and each isolation sleeve wraps around the outside of each stator pole claw. The inner end of each isolation sleeve is integrally formed with the fixed base, and the coil is wound around the outside of each isolation sleeve.

[0008] The lower part of the fixed base is provided with a downward-facing mounting groove, which is located on the inner ring of the fixing ring. A PCB board is fixedly mounted in the mounting groove, and the PCB board is electrically connected to the coil.

[0009] The upper part of the fixed base is provided with an upwardly protruding rotating column, the upper part of the rotor shell is provided with a rotating hole, the rotating column extends out of the rotor shell through the rotating hole, the rotating column is provided with a through hole, the through hole is connected to the mounting groove, and the upper outer side of the rotating column is provided with at least one positioning groove.

[0010] In a further technical solution, the rotating column includes an installation part and a connecting part. The installation part is formed on the upper part of the fixed base, and the connecting part is formed on the upper part of the installation part. The installation part is inserted into the rotating hole and rotates with the rotating hole. A sealing element is provided between the installation part and the rotating hole. The connecting part protrudes from the upper end face of the rotor housing. The outer side of the connecting part is provided with a wire-passing groove and a positioning groove. The wire-passing groove is located above the wire-passing hole.

[0011] In a further technical solution, the outer side of the connecting part is provided with a threading surface and two positioning surfaces at intervals along the circumference. The two positioning surfaces are located on the left and right sides of the threading surface, respectively. The threading surface and the two positioning surfaces intersect to form a connecting part with a triangular cross-section. A threading groove is provided on the threading surface, and a positioning groove is provided on each of the two positioning surfaces.

[0012] In a further technical solution, a connecting arc surface is provided at the connection between the threading surface and the two positioning surfaces, as well as at the connection between the two positioning surfaces. The connecting arc surface has the same curvature as the outer surface of the mounting part and is aligned in the vertical direction.

[0013] In a further technical solution, the upper part of the connecting part is provided with multiple connecting holes at intervals along the circumferential direction.

[0014] In a further technical solution, the inner wall of the connecting hole is provided with internal threads.

[0015] In a further technical solution, each stator pole claw of the stator core has at least one fixed through hole in the middle of its stator pole claw in a vertical direction, and each isolation sleeve has a fixed through rod at the position corresponding to the fixed through hole, and each fixed through rod is inserted into the corresponding fixed through hole.

[0016] In a further technical solution, the fixing base includes an integrally formed inner core skeleton and an outer sleeve. The inner core skeleton is embedded in the inner ring of the fixing ring, and the outer sleeve wraps around the outer side and upper and lower end faces of the fixing ring. The inner end of each isolation sleeve is formed on the outer side of the outer sleeve. The lower end face of the inner core skeleton is located inside the inner ring of the fixing ring. An installation groove is formed between the lower end face of the inner core skeleton and the outer sleeve. The upper part of the outer sleeve is provided with multiple upper notches at intervals along the circumferential direction, and the lower inner edge of the outer sleeve is provided with multiple lower notches at intervals.

[0017] In a further technical solution, the rotor housing includes a housing and an end cover. The end cover is located on the upper part of the housing. A rotating shaft is provided in the center of the housing. A shaft hole is opened in the center of the inner core skeleton. The shaft hole passes through the inner core skeleton and the rotating column in a vertical direction. The upper end of the rotating shaft passes through the shaft hole and protrudes from the upper end face of the rotating column. At least two bearings are provided between the rotating shaft and the shaft hole. The two bearings are spaced apart in a vertical direction.

[0018] The outer surface of the inner core skeleton is provided with multiple reinforcing protrusions at intervals along the circumference, and the inner ring of the corresponding fixing ring is provided with multiple reinforcing grooves, with each reinforcing protrusion embedded in each reinforcing groove.

[0019] In a further technical solution, the bottom of the mounting groove is provided with multiple weight-reducing grooves at intervals along the circumferential direction. Each weight-reducing groove is located on the periphery of the shaft hole, and a reinforcing rib is formed between two adjacent weight-reducing grooves. The bottom of the mounting groove is provided with threaded holes.

[0020] The advantages of this invention compared to existing technologies are as follows: The positioning groove on the rotating column provides installation guidance during hub motor installation, preventing mistaken installation and protecting the control wire from twisting and being pressed between the hub motor and the product, thus improving reliability and stability. No alignment calibration is required during installation, improving assembly efficiency. The plastic bracket is formed onto the outside of the stator core using a die-casting process, eliminating the need for coating the stator core and ensuring consistent spacing between adjacent stator claws. This prevents scratches on the winding edge, reduces the risk of hub motor burnout, and extends service life. The fixed perforations increase the connection area between the plastic bracket and the stator core, allowing the plastic bracket to not only wrap around the stator core but also penetrate it at multiple points, improving the tightness and strength of the connection, preventing loosening, avoiding vibration during operation, improving smoothness, and reducing noise. Attached Figure Description

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] Figure 1 This is a schematic diagram of the structure of this utility model;

[0023] Figure 2 This is a cross-sectional view of the present invention;

[0024] Figure 3 This is the utility model Figure 2 Enlarged view of part A;

[0025] Figure 4 This is a structural schematic diagram of the stator assembly of this utility model;

[0026] Figure 5 This is an exploded view of the stator assembly of this utility model;

[0027] Figure 6 This is a cross-sectional view of the stator assembly of this utility model.

[0028] In the picture:

[0029] 1. Fixed base

[0030] 11 Inner core frame, 111 Mounting groove, 112 Weight reduction groove, 113 Reinforcing rib, 114 Threaded hole, 115 Shaft hole, 116 Reinforcing protrusion

[0031] 12 Outer sleeve, 121 Upper notch, 122 Lower notch

[0032] 2. Rotating column

[0033] 21 Mounting section, 211 Cable threading hole,

[0034] 22 Connecting part, 221 Threading surface, 222 Positioning surface, 223 Connecting arc surface, 224 Positioning groove, 225 Threading groove, 226 Connecting hole,

[0035] 3. Isolation sleeve, 31. Fixing rod,

[0036] 4. Stator core, 41. Fixing ring, 411. Reinforcing groove, 42. Stator pole claw, 421. Fixing hole.

[0037] 5. Rotor housing, 51. Housing, 52. End cover, 521. Rotating hole, 53. Seal, 54. Shaft, 55. Bearing.

[0038] 6 rotor assembly Detailed Implementation

[0039] The following are merely preferred embodiments of the present invention and do not limit the scope of protection of the present invention.

[0040] A hub motor that improves assembly efficiency, such as Figures 1 to 6As shown, the system includes a rotor housing 5, a rotor assembly 6, and a stator assembly. The rotor assembly 6 is disposed on the side of the inner cavity of the rotor housing 5, and the stator assembly is disposed within the inner cavity of the rotor housing 5. The stator assembly includes a stator core 4 and a plastic support. The plastic support is formed on the outside of the stator core 4 using a die-casting process to form an integral structure of the stator assembly. Coils are wound around the plastic support. The stator core 4 includes a fixing ring 41 and multiple stator pole claws 42. Each stator pole claw 42 is evenly spaced along the circumferential direction on the outer side of the fixing ring 41. The plastic support includes a fixing base 1 and multiple isolation sleeves 3. The fixing base 1 is wrapped around the outside of the fixing ring 41, and each isolation sleeve 3 is wrapped around each stator pole claw 42. Externally, the inner ends of each isolation sleeve 3 are integrally formed with the fixed base 1. The coil is wound around the outside of each isolation sleeve 3. The lower part of the fixed base 1 is provided with a downward-facing mounting groove 111. The mounting groove 111 is located in the inner ring of the fixed ring 41. A PCB board is fixedly installed in the mounting groove 111. The PCB board is electrically connected to the coil. The upper part of the fixed base 1 is provided with an upward-protruding rotating column 2. The upper part of the rotor housing 5 is provided with a rotating hole 521. The rotating column 2 extends out of the rotor housing 5 through the rotating hole 521. The rotating column 2 is provided with a through-hole 211 that passes through the rotating column 2. The through-hole 211 communicates with the mounting groove 111. The upper outer side of the rotating column 2 is provided with at least one positioning groove 224. Traditional hub motors lack foolproof design during product assembly, making it easy for control wires to be pressed between the product and the hub motor. This invention, however, uses a positioning groove 224 on the rotating column 2 to guide the hub motor during installation, preventing the control wires from twisting and being pressed between the motor and the product, thus protecting the control wires and improving reliability and stability. No alignment calibration is required during installation, improving assembly efficiency. The plastic bracket is formed onto the outside of the stator core 4 using a die-casting process, eliminating the need for coating the stator core. This ensures a high degree of consistency in the spacing between adjacent stator pole claws, preventing scratches from the winding edge, reducing the risk of hub motor burnout, and extending service life.

[0041] Specifically, the rotating column 2 includes a mounting part 21 and a connecting part 22. The mounting part 21 is formed on the upper part of the fixed base 1, and the connecting part 22 is formed on the upper part of the mounting part 21. The mounting part 21 is inserted into the rotating hole 521 and rotates with the rotating hole 521. A sealing element 53 is provided between the mounting part 21 and the rotating hole 521. The connecting part 22 protrudes from the upper end face of the rotor housing 5. A wire-passing groove 225 and a positioning groove 224 are provided on the outer side of the connecting part 22. The wire-passing groove 225 is located above the wire-passing hole 211. The mounting part 21 is located in the rotating hole 521 and the sealing element 53 is installed in a clearance fit with the rotating hole 521 to seal the rotating hole 521, thereby achieving the purpose of waterproofing and preventing tangling. The connecting part 22 establishes a connection with the product. After the control wire passes through the rotating hole 521, it is given clearance space through the wire-passing groove 225, thereby preventing the control wire from being squeezed by the connecting part 22 and protecting the control wire.

[0042] Specifically, the outer side of the connecting portion 22 is provided with a threading surface 221 and two positioning surfaces 222 spaced apart along the circumference. The two positioning surfaces 222 are located on the left and right sides of the threading surface 221, respectively. The threading surface 221 and the two positioning surfaces 222 intersect to form a connecting portion 22 with a triangular cross-section. A threading groove 225 is provided on the threading surface 221, and each of the two positioning surfaces 222 is provided with a positioning groove 224. The threading surface 221 and the two positioning surfaces 222 form a triangular connecting portion 22, which increases the contact area with the product while preventing slippage.

[0043] Specifically, a connecting arc surface 223 is provided at the connection between the threading surface 221 and the two positioning surfaces 222, as well as at the connection between the two positioning surfaces 222. The connecting arc surface 223 has the same curvature as the outer surface of the mounting part 21 and is aligned in the vertical direction. The connecting arc surface 223 further increases the contact area with the product, increases friction, and facilitates demolding during injection molding.

[0044] Specifically, the upper part of the connecting part 22 is provided with a plurality of connecting holes 226 spaced apart along the circumferential direction. After the connecting part 22 is inserted into the slot corresponding to the product, the connecting rod is then inserted into the connecting hole 226 to improve the connection strength.

[0045] Specifically, the inner wall of the connecting hole 226 is provided with internal threads. The product and the hub motor are further secured by screws and connecting holes 226, which further improves the connection strength and facilitates production assembly.

[0046] Specifically, each stator pole claw 42 of the stator core 4 has at least one vertically penetrating fixing hole 421 in its middle. Correspondingly, each isolation sleeve 3 has a fixing rod 31 positioned at the fixing hole 421, and each fixing rod 31 is inserted into its corresponding fixing hole 421. The fixing holes 421 increase the connection area between the plastic support and the stator core 4, allowing the plastic support to not only wrap around the outside of the stator core 4 but also penetrate it at multiple points. This improves the tightness and stability of the connection between the plastic support and the stator core 4, preventing the plastic support from loosening, avoiding vibration during operation, improving smoothness, and reducing noise.

[0047] Specifically, the fixed base 1 includes an integrally formed inner core skeleton 11 and an outer sleeve 12. The inner core skeleton 11 is embedded in the inner ring of the fixed ring 41, and the outer sleeve 12 wraps around the outer side and the upper and lower end faces of the fixed ring 41. The inner end of each isolation sleeve 3 is formed on the outer side of the outer sleeve 12. The lower end face of the inner core skeleton 11 is located inside the inner ring of the fixed ring 41. An installation groove 111 is formed between the lower end face of the inner core skeleton 11 and the outer sleeve 12. The upper part of the outer sleeve 12 is provided with a plurality of upper notches 121 at intervals along the circumferential direction, and the lower inner edge of the outer sleeve 12 is provided with a plurality of lower notches 122 at intervals. The inner core skeleton 11 fills the inner ring of the fixing ring 41, while the outer sleeve 12 wraps the fixing ring 41. The mounting groove 111 is located in the inner ring of the fixing ring 41 to provide space for the PCB board and reduce the thickness of the hub motor. Part of the fixing ring 41 is exposed through the upper notch 121 and the lower notch 122 to reduce magnetic field interference and facilitate injection molding production.

[0048] Specifically, the rotor housing 5 includes a housing 51 and an end cover 52. The end cover 52 covers the upper part of the housing 51. A rotating shaft 54 ​​is provided at the center of the housing 51. A shaft hole 115 is provided at the center of the inner core frame 11. The shaft hole 115 passes through the inner core frame 11 and the rotating column 2 in a vertical direction. The upper end of the rotating shaft 54 ​​passes through the shaft hole 115 and protrudes from the upper end face of the rotating column 2. At least two bearings 55 are provided between the rotating shaft 54 ​​and the shaft hole 115. The two bearings 55 are spaced apart in a vertical direction. A plurality of reinforcing protrusions 116 are spaced apart in a circumferential direction on the outer side of the inner core frame 11. A plurality of reinforcing grooves 411 are provided on the inner ring of the corresponding fixing ring 41. Each reinforcing protrusion 116 is embedded in each reinforcing groove 411. The hub motor's power is transmitted to the product via the rotating shaft 54, facilitating the transmission connection of other components and reducing the number of drive sources, thus simplifying the product and lowering costs. The connection strength and area between the stator pole claw 42 and the isolation sleeve 3 are strengthened by the fixed through hole 421 and the fixed through rod 31, while the connection strength and area between the fixed ring 41 and the fixed base 1 are strengthened by the reinforced protrusion 116 and the reinforced groove 411, further improving the connection strength and tightness between the rotor core 4 and the plastic support.

[0049] Specifically, the bottom of the mounting groove 111 is provided with multiple weight-reducing grooves 112 spaced apart along the circumferential direction. Each weight-reducing groove 112 is located on the periphery of the shaft hole 115, and a reinforcing rib 113 is formed between two adjacent weight-reducing grooves 112. The bottom of the mounting groove 111 is provided with threaded holes 114. The weight of the plastic bracket is reduced by the weight-reducing grooves 112, and the structural strength of the plastic bracket is improved by the reinforcing rib 113. This reduces the weight of the hub motor and lowers the cost. The threaded holes 114 facilitate the screw fixing of the PCB board, making the installation of the PCB board easier.

[0050] 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 hub motor with improved assembly efficiency, comprising a rotor housing (5), a rotor assembly (6), and a stator assembly, wherein the rotor assembly (6) is disposed on the side of the inner cavity of the rotor housing (5), and the stator assembly is disposed within the inner cavity of the rotor housing (5), characterized in that: The stator assembly includes a stator core (4) and a plastic bracket. The plastic bracket is formed on the outside of the stator core (4) by a die-casting process to form an integral stator assembly. The plastic bracket is wound with coils. The stator core (4) includes a fixed ring (41) and multiple stator pole claws (42), with each stator pole claw (42) being equally spaced along the circumferential direction on the outer side of the fixed ring (41). The plastic support includes a fixed base (1) and multiple isolation sleeves (3). The fixed base (1) is wrapped around the outside of the fixed ring (41), and each isolation sleeve (3) is wrapped around the outside of each stator pole claw (42). The inner end of each isolation sleeve (3) is integrally formed with the fixed base (1), and the coil is wound around the outside of each isolation sleeve (3). The lower part of the fixed base (1) is provided with a downward-facing mounting groove (111). The mounting groove (111) is located in the inner ring of the fixed ring (41). A PCB board is fixedly installed in the mounting groove (111). The PCB board is electrically connected to the coil. The upper part of the fixed base (1) is provided with an upwardly protruding rotating column (2), and the upper part of the rotor housing (5) is provided with a rotating hole (521). The rotating column (2) extends out of the rotor housing (5) through the rotating hole (521). The rotating column (2) is provided with a through hole (211) that passes through the rotating column (2). The through hole (211) is connected to the mounting groove (111). At least one positioning groove (224) is provided on the outer side of the upper part of the rotating column (2).

2. The hub motor for improving assembly efficiency according to claim 1, characterized in that: The rotating column (2) includes a mounting part (21) and a connecting part (22). The mounting part (21) is formed on the upper part of the fixed base (1), and the connecting part (22) is formed on the upper part of the mounting part (21). The mounting part (21) is inserted into the rotating hole (521) and rotates with the rotating hole (521). A sealing element (53) is provided between the mounting part (21) and the rotating hole (521). The connecting part (22) protrudes from the upper end face of the rotor housing (5). The outer side of the connecting part (22) is provided with a wire groove (225) and the positioning groove (224). The wire groove (225) is located above the wire hole (211).

3. A hub motor for improving assembly efficiency according to claim 2, characterized in that: The outer side of the connecting part (22) is provided with a threading surface (221) and two positioning surfaces (222) arranged sequentially along the circumference. The two positioning surfaces (222) are located on the left and right sides of the threading surface (221) respectively. The threading surface (221) and the two positioning surfaces (222) intersect to form a connecting part (22) with a triangular cross section. The threading groove (225) is provided on the threading surface (221), and the two positioning surfaces (222) are each provided with a positioning groove (224).

4. A hub motor for improving assembly efficiency according to claim 3, characterized in that: A connecting arc surface (223) is provided at the connection between the threading surface (221) and the two positioning surfaces (222) and at the connection between the two positioning surfaces (222). The connecting arc surface (223) has the same curvature as the outer surface of the mounting part (21) and is aligned in the vertical direction.

5. A hub motor for improving assembly efficiency according to claim 2, characterized in that: The upper part of the connecting part (22) is provided with a plurality of connecting holes (226) at intervals along the circumferential direction.

6. A hub motor for improving assembly efficiency according to claim 5, characterized in that: The inner wall of the connecting hole (226) is provided with an internal thread.

7. A hub motor for improving assembly efficiency according to any one of claims 1 to 6, characterized in that: At least one fixed through hole (421) is provided in the middle of each stator pole claw (42) of the stator core (4) in the vertical direction. Correspondingly, each isolation sleeve (3) is provided with a fixed through rod (31) at the position of the fixed through hole (421). Each fixed through rod (31) is inserted into the corresponding fixed through hole (421).

8. A hub motor for improving assembly efficiency according to claim 7, characterized in that: The fixed base (1) includes an integrally formed inner core skeleton (11) and an outer sleeve (12). The inner core skeleton (11) is embedded in the inner ring of the fixed ring (41). The outer sleeve (12) wraps around the outer side and the upper and lower end faces of the fixed ring (41). The inner end of each isolation sleeve (3) is formed on the outer side of the outer sleeve (12). The lower end face of the inner core skeleton (11) is located inside the inner ring of the fixed ring (41). The mounting groove (111) is formed between the lower end face of the inner core skeleton (11) and the outer sleeve (12). The upper part of the outer sleeve (12) is provided with multiple upper notches (121) at intervals along the circumferential direction. The lower inner edge of the outer sleeve (12) is provided with multiple lower notches (122) at intervals.

9. A hub motor for improving assembly efficiency according to claim 8, characterized in that: The rotor housing (5) includes a housing (51) and an end cover (52). The end cover (52) covers the upper part of the housing (51). A rotating shaft (54) is provided in the center of the housing (51). A shaft hole (115) is provided in the center of the inner core skeleton (11). The shaft hole (115) passes through the inner core skeleton (11) and the rotating column (2) in the vertical direction. The upper end of the rotating shaft (54) passes through the shaft hole (115) and protrudes from the upper end face of the rotating column (2). At least two bearings (55) are provided between the rotating shaft (54) and the shaft hole (115). The two bearings (55) are spaced apart in the vertical direction. The outer side of the inner core skeleton (11) is provided with a plurality of reinforcing protrusions (116) spaced apart along the circumferential direction, and the inner ring of the corresponding fixing ring (41) is provided with a plurality of reinforcing grooves (411), and each reinforcing protrusion (116) is embedded in each reinforcing groove (411).

10. A hub motor for improving assembly efficiency according to claim 9, characterized in that: The mounting groove (111) has multiple weight-reducing grooves (112) spaced apart along the circumferential direction at the bottom of the groove. Each weight-reducing groove (112) is located on the periphery of the shaft hole (115). A reinforcing rib (113) is formed between two adjacent weight-reducing grooves (112). The bottom of the mounting groove (111) is provided with a threaded hole (114).

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