A wheel hub motor

Abstract

The application relates to the technical field of speed reduction motors, and specifically discloses a wheel hub motor which comprises fixedly connected shell and cover, a shaft core, an electromagnetic mechanism and a speed reduction mechanism, the shell and the cover surround to form a containing cavity, a stator support is arranged in the containing cavity and divides the containing cavity into a first chamber and a second chamber, the shaft core is rotatably arranged in the stator support, one end of the shaft core is located in the first chamber, the other end of the shaft core is located in the second chamber, the electromagnetic mechanism is located in the first chamber and is connected with one end of the shaft core, the speed reduction mechanism is located in the second chamber and is connected with the other end of the shaft core, an inner gear ring is integrally formed on the inner side wall of the second chamber of the shell, and the inner gear ring is engaged with the speed reduction mechanism. The application has the effect of improving product precision and service life.

Description

Technical Field

[0001] This application relates to the technical field of geared motors, and in particular to a hub motor. Background Technology

[0002] In-wheel motors are drive devices that highly integrate the motor, reducer, and control system inside the wheel hub, enabling direct power output from the motor to the wheel and eliminating the need for traditional mechanical transmission systems (such as drive shafts and differentials). This provides strong technical support for the development of electric vehicles, electric bicycles, and various electric vehicles.

[0003] The prior art CN223899076U discloses a multi-purpose novel fixed center shaft geared motor for wheel hubs, which includes a geared motor body. The geared motor body includes an outer rotor motor, a drive gear, a planetary gear carrier assembly, and a wheel hub housing. The drive gear is installed inside the outer rotor motor and fixed by countersunk screws. A shaft retaining spring is inserted, and an A-type flat key is installed. The planetary gear carrier assembly is press-fitted in to form component one. An internal gear ring is press-fitted into the wheel hub housing. A bearing is installed into the rear end cover. The contact surface between the wheel hub housing and the rear end cover is coated with sealant, and the wheel hub housing and the rear end cover are connected and fixed by an internal hexagonal head screw to form component two. Component one is installed into component two to form the geared motor body.

[0004] However, the structure of the internal gear ring press-fitted into the wheel hub housing is not very stable and is prone to loosening after long-term operation, which affects the product's accuracy and service life. This problem urgently needs to be solved. Summary of the Invention

[0005] In order to improve the accuracy and service life of the product, this application provides a hub motor.

[0006] This application provides a hub motor, which adopts the following technical solution: A hub motor, comprising: A fixedly connected housing and cover, the housing and cover forming a receiving cavity; A stator support, wherein the stator support is disposed within the receiving cavity and divides the receiving cavity into a first chamber and a second chamber; A shaft core, which is rotatably mounted on the stator support, with one end of the shaft core located in the first cavity and the other end of the shaft core located in the second cavity; An electromagnetic mechanism, which is located in the first cavity and connected to one end of the shaft core; A speed reduction mechanism, which is located in the second chamber and connected to the other end of the shaft core; An internal gear ring is integrally formed on the inner wall of the housing located in the second chamber, and the internal gear ring meshes with the reduction mechanism.

[0007] By adopting the above technical solution, the stator bracket divides the accommodating cavity formed by the shell and the cover into a first chamber and a second chamber. The electromagnetic mechanism is housed in the first chamber, and the reduction mechanism is housed in the second chamber, ensuring that the operation of the electromagnetic mechanism and the reduction mechanism does not interfere with each other. Furthermore, the electromagnetic mechanism and the reduction mechanism are connected by a shaft core. At the same time, the segmented chamber structure helps to shorten the length of the shell, allowing for a further increase in the thickness of the cover. The increased thickness of the cover helps to improve the structural strength and stability of the hub motor, significantly reducing the deformation of the hub motor shell, ensuring the roundness of the hub motor, thereby improving the accuracy of the tooth profile and thus extending the service life of the hub motor. In addition, the internal gear ring is integrally formed on the inner sidewall of the shell, which further improves the structural stability and prevents loosening after long-term operation, thus improving the accuracy and service life of the hub motor.

[0008] Preferably, the internal gear ring is configured with a helical gear structure, and the reduction mechanism includes a plurality of planetary gears, which are spaced around the periphery of the shaft core, and each of the planetary gears is configured with a helical gear structure that meshes with the internal gear ring.

[0009] By adopting the above technical solution, the internal gear ring is set with a helical tooth structure, which helps to improve transmission efficiency, reduce noise and wear, and thus help to extend service life.

[0010] Preferably, one end of the shaft core that penetrates into the second chamber is provided with a helical tooth structure, and a plurality of planetary gears are meshed around the end of the shaft core that penetrates into the second chamber.

[0011] By adopting the above technical solution, the shaft core drives the new gear to rotate through the helical tooth structure, which helps to further improve transmission efficiency, reduce noise and wear, and thus help to extend service life.

[0012] Preferably, the electromagnetic mechanism includes a housing, a stator core, magnets, a magnetic support, and a PCB board. The housing, the stator core, the magnetic support, and the PCB board are coaxially arranged. The magnetic support is attached to the inner sidewall of the housing. The upper end of the magnetic support has evenly spaced mounting slots for mounting the magnets. The magnets are evenly spaced around the stator core. The PCB board is fixedly connected to the surface of the stator support.

[0013] By adopting the above technical solution, the magnetic support supports the magnet, and the magnet is installed in the mounting groove opened in the magnetic support, which helps to improve the stability of the magnet, thereby improving the stability of the electromagnetic effect.

[0014] Preferably, the stator support has a plurality of bearings spaced at intervals along the length of the shaft core at the position where the shaft core passes through.

[0015] By adopting the above technical solution, the stator bracket provides an installation position for the bearing, and the bearing is located in the middle of the shaft core, which helps to improve the stability of the shaft core rotation, thereby improving accuracy.

[0016] Preferably, the shaft core is fitted with a riveting sleeve, one end of which abuts against the housing and the other end of which abuts against the bearing.

[0017] By adopting the above technical solution, the riveting sleeve setting helps to improve the stability of the bearing.

[0018] Preferably, the stator support is provided with a plurality of positioning posts, the plurality of positioning posts being integrally formed with the stator support, and the planetary gears being sleeved on the positioning posts one by one.

[0019] By adopting the above technical solution, the positioning column and stator support are integrally molded, which helps to reduce production costs and enhance structural strength. The positioning column positions the planetary gear, which helps to improve the stability of the planetary gear.

[0020] Preferably, the stator support is integrally formed with a support column, the support column is fixedly connected to a limit plate, and a space is formed between the stator support and the limit plate for the planetary gear to move.

[0021] By adopting the above technical solution, the integrated molding of the support column and stator bracket helps to reduce production costs and enhance structural strength. The limiting plate limits the planetary gear, which helps to further improve the stability of the planetary gear during operation.

[0022] Preferably, the wiring port of the PCB board is passed through the stator bracket, the wiring port of the PCB board is connected to a cable, the limiting plate is provided with a connecting bushing for the cable to pass through, the connecting bushing is coaxially arranged with the shaft core, and the limiting plate is also provided with a connecting groove for the cable to pass through, the connecting groove is connected to the connecting bushing.

[0023] By adopting the above technical solution, the cable is connected to the wiring port of the PCB board, and then passes through the connecting shaft sleeve through the connecting groove. The connecting groove avoids the cable arrangement and connection, which helps to improve the neatness of the cable installation.

[0024] Preferably, a baffle is provided on the surface of the limiting plate facing the planetary gear, and the baffle closes the opening side of the communicating groove facing the planetary gear.

[0025] By adopting the above technical solution, the baffle closes the connecting groove facing the opening side of the planetary gear, thus isolating the cable from the planetary gear, effectively preventing friction between the planetary gear and the cable, which helps to save space and eliminate safety hazards.

[0026] In summary, this application includes at least one of the following beneficial technical effects: 1. By setting a stator support, the stator support divides the accommodating cavity formed by the housing and the cover into a first chamber and a second chamber. The electromagnetic mechanism is housed in the first chamber, and the reduction mechanism is housed in the second chamber, so that the operation of the electromagnetic mechanism and the reduction mechanism does not interfere with each other. The electromagnetic mechanism and the reduction mechanism are connected by a shaft. At the same time, the segmented chamber structure helps to shorten the length of the housing, which allows for a further increase in the thickness of the cover. The increased thickness of the cover helps to improve the structural strength and stability of the hub motor, significantly reduces the deformation of the hub motor housing, helps to ensure the roundness of the hub motor, thereby improving the accuracy of the tooth profile and thus helping to extend the service life of the hub motor.

[0027] 2. By integrally molding the internal gear ring with a helical tooth structure on the inner wall of the housing located in the second chamber, the integral molding structure is conducive to improving structural stability and will not loosen after long-term operation. This is beneficial to improving the accuracy and service life of the hub motor. The helical tooth structure is conducive to improving transmission efficiency and reducing noise and wear, which is conducive to further extending the service life.

[0028] 3. By setting bearings in the stator support, the stator support provides a mounting position for the bearings, and the bearings are located in the middle of the shaft core, which helps to improve the stability of the shaft core rotation, thereby improving accuracy. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the overall structure of the hub motor in an embodiment of this application.

[0030] Figure 2 This is a cross-sectional view of the hub motor in an embodiment of this application.

[0031] Figure 3 This is a schematic diagram of the helical gear meshing connection of the shaft core, planetary gear and internal gear ring in the embodiments of this application.

[0032] Figure 4 This is a schematic diagram of the electromagnetic mechanism in an embodiment of this application.

[0033] Figure 5 This is a diagram showing the fit between the limiting plate and the stator bracket in an embodiment of this application.

[0034] Figure 6 This is a schematic diagram showing the position of the baffle in an embodiment of this application.

[0035] Explanation of reference numerals in the attached figures: 1. Housing; 2. Cover; 3. Stator support; 4. First chamber; 5. Second chamber; 6. Shaft core; 7. Electromagnetic mechanism; 71. Housing; 72. Stator core; 73. Magnet; 74. Magnetic support; 75. PCB board; 8. Reduction mechanism; 81. Planetary gear; 9. Internal gear ring; 10. Mounting slot; 11. Bearing; 12. Positioning column; 13. Support column; 14. Limiting plate; 15. Cable; 16. Connecting bushing; 17. Connecting groove; 18. Baffle; 19. Riveting sleeve. Detailed Implementation

[0036] The following is in conjunction with the appendix Figures 1-6 This application will be described in further detail.

[0037] This application discloses a hub motor, referring to... Figure 1 and Figure 2 The system includes a housing 1, a cover 2, a stator support 3, a shaft 6, an electromagnetic mechanism 7, and a reduction mechanism 8. The housing 1 and the cover 2 are fixedly connected by bolts and are cylindrical in shape. The housing 1 and the cover 2 form a cavity for accommodating the stator support 3, the shaft 6, the electromagnetic mechanism 7, and the reduction mechanism 8. The stator support 3 is disposed within the cavity and divides the cavity into a first chamber 4 and a second chamber 5, where the first chamber 4 is closer to the cover 2 and the second chamber 5 is farther away from the cover 2. The electromagnetic mechanism 7 is located in the first chamber 4, and the reduction mechanism 8 is located in the second chamber 5. The shaft 6 is rotatably inserted through the stator support 3, with one end of the shaft 6 located in the first chamber 4 and connected to the electromagnetic mechanism 7, and the other end of the shaft 6 located in the second chamber 5 and connected to the reduction mechanism 8. It should be noted that the segmented chamber structure can shorten the length of the shell 1, allowing for a further increase in the thickness of the cover 2. The increased thickness of the cover 2 helps improve the structural strength and stability of the hub motor, significantly reduces the deformation of the hub motor shell, ensures the roundness of the hub motor, thereby improving the accuracy of the tooth profile and ultimately extending the service life of the hub motor.

[0038] It is worth mentioning that the shaft core 6 and stator bracket 3 adopt an integrated die-casting process, which reduces costs while ensuring strength and concentricity.

[0039] Reference Figure 2 and Figure 3An internal gear ring 9 is integrally formed on the inner wall of the housing 1 located in the second chamber 5, and the internal gear ring 9 meshes with the reduction mechanism 8. Furthermore, the internal gear ring 9 is configured with a helical gear structure. The reduction mechanism 8 includes several planetary gears 81. In this embodiment, the number of planetary gears 81 is set to three, with the three planetary gears 81 evenly spaced around the periphery of the shaft core 6, and all three planetary gears 81 are configured with helical gears that mesh with the internal gear ring 9. In addition, the end of the shaft core 6 that penetrates into the second chamber 5 is also provided with a helical gear structure, with the three planetary gears 81 meshing around and engaging with the end of the shaft core 6 that penetrates into the second chamber 5. The helical gear meshing structure is beneficial for improving transmission efficiency and reducing noise and wear, thereby extending service life.

[0040] Reference Figure 2 and Figure 4 The electromagnetic mechanism 7 includes a housing 71, a stator core 72, magnets 73, a magnetic support 74, and a PCB board 75. The housing 71, stator core 72, magnetic support 74, and PCB board 75 are coaxially arranged. The magnetic support 74 is attached to the inner wall of the housing 71. The upper end of the magnetic support 74 has evenly spaced mounting slots 10 for mounting magnets 73. The magnetic support 74 supports the magnets 73, and the magnets 73 are installed in the mounting slots 10 of the magnetic support 74 to improve the stability of the magnets 73, thereby improving the stability of the electromagnetic effect. At the same time, the magnets 73 are evenly spaced around the stator core 72, and the shaft core 6 passes through the stator core 72. The PCB board 75 is fixedly connected to the surface of the stator support 3 facing the first chamber 4 by bolts.

[0041] Reference Figure 2 The stator bracket 3 has several bearings 11 spaced at intervals along the length of the shaft core 6, where the shaft core 6 passes through. In this embodiment, the stator bracket 3 has two bearings 11. The stator bracket 3 provides mounting positions for the bearings 11, and the bearings 11 are located in the middle of the shaft core 6, which helps to improve the stability of the shaft core 6's rotation and thus improves accuracy. In addition, the shaft core 6 is fitted with a riveting sleeve 19, which is located in the first chamber 4. One end of the riveting sleeve 19 abuts against the housing 71, and the other end of the riveting sleeve 19 abuts against the bearing 11 to improve the installation stability of the bearing 11.

[0042] Reference Figure 5 and Figure 6The stator support 3 has several positioning posts 12 on the side facing the second chamber 5. The positioning posts 12 are perpendicular to the stator support 3. In this embodiment, the number of positioning posts 12 corresponds to the number of planetary gears 81, and the three positioning posts 12 are integrally formed with the stator support 3 to reduce production costs and enhance structural strength. The three planetary gears 81 are fitted one-to-one with the three positioning posts 12. In addition, the stator support 3 also has an integrally formed support post 13 on the side facing the second chamber 5. The other end of the support post 13 is fixedly connected to a limiting plate 14 by bolts, so that a space for the planetary gears 81 to move is formed between the stator support 3 and the limiting plate 14. The limiting plate 14 limits the planetary gears 81 to further improve the stability of the planetary gears 81 during operation.

[0043] Reference Figure 5 and Figure 6 The main board of PCB board 75 is located in the first chamber 4. PCB board 75 also has a wiring port. The wiring port of PCB board 75 passes through the stator bracket 3 and enters the second chamber 5. The wiring port of PCB board 75 is connected to a cable 15. At the same time, the limiting plate 14 is provided with a connecting bushing 16 for the cable 15 to pass through. The connecting bushing 16 is coaxially arranged with the shaft core 6. The limiting plate 14 also has a connecting groove 17 for the cable 15 to pass through. The connecting groove 17 is connected to the connecting bushing 16. The cable 15 passes into the connecting groove 17 and the connecting bushing 16.

[0044] Reference Figure 5 and Figure 6 Because of the opening of the connecting groove 17, there is a possibility that the cable 15 may come into contact with the planetary gear 81. The cable 15 will be worn when in contact with the high-speed rotating planetary gear 81. To solve this problem, a baffle 18 is fixedly provided on the surface of the limiting plate 14 facing the planetary gear 81. The baffle 18 closes the opening side of the connecting groove 17 facing the planetary gear 81, allowing the cable 15 to pass through while isolating the cable 15 from the planetary gear 81, thus preventing friction between the planetary gear 81 and the cable 15, saving space and eliminating safety hazards.

[0045] The implementation principle of a hub motor according to an embodiment of this application is as follows: the stator bracket 3 divides the accommodating cavity formed by the housing 1 and the cover 2 into a first chamber 4 and a second chamber 5. The electromagnetic mechanism 7 is housed in the first chamber 4, and the reduction mechanism 8 is housed in the second chamber 5, so that the operation of the electromagnetic mechanism 7 and the reduction mechanism 8 does not interfere with each other. The electromagnetic mechanism 7 and the reduction mechanism 8 are connected by the shaft core 6. At the same time, the segmented chamber structure helps to shorten the length of the housing 1, which allows for a further increase in the thickness of the cover 2. The increased thickness of the cover 2 helps to improve the structural strength and stability of the hub motor, significantly reduces the deformation of the hub motor housing, helps to ensure the roundness of the hub motor, thereby improving the accuracy of the tooth profile and thus improving the service life of the hub motor. The internal gear ring 9 is integrally formed in the housing 1, which helps to improve structural stability and prevents loosening after long-term operation, thereby improving the accuracy and service life of the hub motor. The helical tooth meshing structure of the internal gear ring 9, the planetary gear 81, and the shaft core 6 helps to improve transmission efficiency and reduce noise and wear, thereby further extending the service life.

[0046] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A hub motor, characterized in that, include: A fixedly connected housing (1) and cover (2) are provided, wherein the housing (1) and cover (2) enclose a receiving cavity; Stator support (3), the stator support (3) is disposed in the accommodating cavity and divides the accommodating cavity into a first chamber (4) and a second chamber (5); A shaft core (6) is rotatably mounted on the stator bracket (3). One end of the shaft core (6) is located in the first chamber (4), and the other end of the shaft core (6) is located in the second chamber (5). An electromagnetic mechanism (7) is located in the first chamber (4) and connected to one end of the shaft core (6); A speed reduction mechanism (8) is located in the second chamber (5) and connected to the other end of the shaft core (6); The inner wall of the housing (1) located in the second chamber (5) is integrally formed with an internal gear ring (9), which meshes with the reduction mechanism (8).

2. The hub motor according to claim 1, characterized in that: The internal gear ring (9) is configured with a helical tooth structure, and the reduction mechanism (8) includes a plurality of planetary gears (81). The plurality of planetary gears (81) are spaced around the periphery of the shaft core (6), and the plurality of planetary gears (81) are all configured with helical tooth structures that mesh with the internal gear ring (9).

3. A hub motor according to claim 2, characterized in that: The end of the shaft (6) that penetrates into the second chamber (5) is provided with a helical tooth structure, and a plurality of planetary gears (81) are meshed around the end of the shaft (6) that penetrates into the second chamber (5).

4. A hub motor according to claim 2, characterized in that: The electromagnetic mechanism (7) includes a housing (71), a stator core (72), a magnet (73), a magnetic support (74), and a PCB board (75). The housing (71), the stator core (72), the magnetic support (74), and the PCB board (75) are coaxially arranged. The magnetic support (74) is attached to the inner side wall of the housing (71). The upper end of the magnetic support (74) is provided with mounting slots (10) for mounting the magnets (73) at even intervals. The magnets (73) are evenly spaced around the stator core (72). The PCB board (75) is fixedly connected to the surface of the stator support (3).

5. A hub motor according to claim 4, characterized in that: The stator bracket (3) has a plurality of bearings (11) spaced at intervals along the length of the shaft core (6) for the shaft core (6) to pass through.

6. A hub motor according to claim 5, characterized in that: The shaft core (6) is fitted with a riveting sleeve (19), one end of which abuts against the housing (71) and the other end of which abuts against the bearing (11).

7. A hub motor according to claim 2, characterized in that: The stator support (3) is provided with a plurality of positioning posts (12), and the plurality of positioning posts (12) are integrally formed with the stator support (3). The planetary gears (81) are fitted one-to-one with the positioning posts (12).

8. A hub motor according to claim 4, characterized in that: The stator bracket (3) is integrally formed with a support column (13), and the support column (13) is fixedly connected to a limiting plate (14). A space is formed between the stator bracket (3) and the limiting plate (14) for the planetary gear (81) to move.

9. A hub motor according to claim 8, characterized in that: The wiring port of the PCB board (75) is passed through the stator bracket (3). The wiring port of the PCB board (75) is connected to a cable (15). The limiting plate (14) is provided with a connecting bushing (16) for the cable (15) to pass through. The connecting bushing (16) is coaxially arranged with the shaft core (6). The limiting plate (14) is also provided with a connecting groove (17) for the cable (15) to pass through. The connecting groove (17) is connected to the connecting bushing (16).

10. A hub motor according to claim 9, characterized in that: The limiting plate (14) has a baffle (18) on its surface facing the planetary gear (81), and the baffle (18) closes the opening side of the connecting groove (17) facing the planetary gear (81).

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